JP7222860B2 - Variable displacement oil pump and method for manufacturing oil pump - Google Patents

Description

The present invention relates to a variable displacement oil pump and a method for manufacturing the oil pump.

As a variable displacement oil pump, for example, a variable displacement oil pump disclosed in Patent Document 1 below is known.

A variable displacement oil pump as disclosed in Patent Document 1 includes a housing having an accommodating portion having an opening therein, a cover member for sealing the opening of the accommodating portion, a cam ring accommodated in the accommodating portion, and a cam ring. and a pump mechanism housed in the inner circumference.

Also, the variable displacement oil pump changes the flow rate of discharged oil by moving the cam ring.

Further, a control chamber is provided between the inner periphery of the housing that accommodates the cam ring and the outer periphery of the cam ring, and the control chamber contains oil at a pressure different from the discharge pressure discharged from the pump. It is meant to be guided.

Therefore, the cam ring moves according to the pressure in the main oil gallery, and the flow rate of the oil discharged from the pump mechanism is changed.

JP 2019-19673 A

For example, due to layout reasons, there are cases where the oil discharged from the pump mechanism must be supplied to the outer peripheral side of the control chamber arranged on the outer peripheral side of the cam ring. In this case, it is necessary to provide the cover member with a seal portion that seals the control chamber, and a discharge passage that traverses the seal portion and guides the oil discharged from the pump mechanism to the outer peripheral side of the cam ring.

However, in order to provide a passage that traverses the seal portion, it is necessary to mold using a core that can be collapsed and removed after molding, resulting in a problem of high cost.

SUMMARY OF THE INVENTION The present invention has been devised in view of such circumstances, and a variable displacement oil pump and a The object is to provide a method for manufacturing an oil pump.

In the present invention, as one aspect thereof, the cover member is fixed to the opening by a crimping portion formed in at least a part of the inner peripheral position of the opening where the seal portion is arranged, and is between the seal portion and the cover member. A sealing member is provided in which a discharge passage through which oil discharged from the discharge portion of the pump structure flows is formed.

The present invention provides a passageway across the control chamber without the use of a core that collapses and is removed after molding.

FIG. 2 is a front view of the variable displacement oil pump of the present embodiment with the cover member removed; FIG. 2 is a front view of the variable displacement oil pump of the present embodiment with a cover member attached; FIG. 4 is a rear view of the chain case showing the inside of the chain case; FIG. 4 is a front view showing the vicinity of the sealing member arrangement opening with the sealing member removed; Figure 3 is a cross-sectional perspective view taken along line AA of Figure 2; (a) is a plan view showing the internal state of the variable displacement oil pump when the solenoid valve is energized, and (b) is the internal state of the variable displacement oil pump when the solenoid valve is not energized. It is a top view. FIG. 4 is a plan view of the variable displacement oil pump showing the flow of oil in the variable displacement oil pump; FIG. 4 is a cross-sectional view of a first mold and a second mold used for manufacturing the oil passage connecting portion of the variable displacement oil pump; It is a process drawing which shows a metal material pouring process. It is process drawing which shows a casting process. It is process drawing which shows the assembly|attachment process of a cover member to a housing main body.

An embodiment of a variable displacement oil pump according to the present invention as an oil pump will be described below with reference to the drawings.

FIG. 1 is a front view of the variable displacement oil pump of this embodiment with the cover member 8 removed. FIG. 2 is a front view of the variable displacement oil pump of this embodiment with the cover member 8 attached. 3 is a rear view of the chain case 10 showing the inside of the chain case 10. FIG.

A variable displacement oil pump supplies oil (lubricating oil) for lubricating sliding parts of an internal combustion engine and for driving a valve timing control device. The variable displacement oil pump comprises a housing body 1, a rotor 2, nine vanes 3, a cam ring (adjustment ring) 4 as a control member, an urging member such as a first coil spring 5, and a pair of ring members. 6, first and second sealing means 7A and 7B, a cover member 8, and an electromagnetic valve 9.

The housing body 1 is formed integrally with a chain case 10 that houses a timing chain (not shown) from a metal material such as an aluminum alloy material. The housing body 1 is formed in a cylindrical shape with a bottom so that one end side is open and the inside has a pump accommodating portion 11 having a substantially cylindrical depression. The housing body 1 has a first bearing hole 11b that rotatably supports the crankshaft 12 at the center position of the bottom surface 11a of the pump accommodating portion 11 . The housing main body 1 is formed with a continuous flat mounting surface 1a in an annular shape on the outer peripheral side of the opening of the pump accommodating portion 11 to serve as a surface for mounting the cover member 8 thereon. The mounting surface 1a is formed with eight screw holes 1b into which fixing members such as bolts 13 are screwed. Further, the cover member 8 is formed with eight fixing member through-holes (not shown) through which the bolts 13 pass, at positions corresponding to the eight screw holes 1b of the housing body 1. As shown in FIG. The cover member 8 is fixed to the housing body 1 by screwing the bolts 13 into the eight screw holes 1b through these fixing member through holes. The housing main body 1 and the cover member 8 fixed in this way constitute a housing that accommodates the rotor 2 and the like. Further, the cover member 8 is formed with a second bearing hole 8a for rotatably supporting the crankshaft 12 at a position corresponding to the first bearing hole 11b of the housing body 1. As shown in FIG.

The rotor 2 has a cylindrical shape and is rotatably housed inside the cam ring 4 in the pump housing portion 11 . A central portion of the rotor 2 is coupled to the crankshaft 12 . The rotor 2 is formed with nine slits 2a extending radially outward from the inner center side of the rotor 2 . Further, on both side surfaces of the rotor 2, circular recesses 2b that are circularly recessed around the crankshaft 12 are formed. A ring member 6 is slidably arranged in the circular recess 2b. Further, a back pressure chamber 2c for introducing the discharge oil discharged to the discharge port 20 is formed at the inner proximal end of each slit 2a. The back pressure chamber 2c opens into the circular recess 2b. Oil from a second control chamber 25, which will be described later, flows into the back pressure chamber 2c via the discharge port 20 and the circular recess 2b. Therefore, each vane 3 retractably accommodated in the slit 2a of the rotor 2 is pushed outward by the centrifugal force accompanying the rotation of the rotor 2 and the hydraulic pressure in the back pressure chamber 2c.

The vanes 3 are made of metal in the form of thin plates, and are accommodated in the slits 2a of the rotor 2 so as to be retractable. When the vane 3 is accommodated in the slit 2a, some gap is formed between the vane 3 and the slit 2a. The vane 3 has a tip surface slidably contacting the inner peripheral surface of the cam ring 4 and a base end inner end surface slidably contacting the outer peripheral surface of the ring member 6 . As a result, even when the engine speed is low and the centrifugal force and the hydraulic pressure in the back pressure chamber 2c are small, the vanes 3 slidably come into contact with the inner peripheral surface of the cam ring 4, and each pump chamber 22 is liquid-tightly defined. It is designed to be

The cam ring 4 is integrally formed of a sintered metal in a substantially cylindrical shape. At a predetermined position on the outer periphery of the cam ring 4, a pivot portion 4a having a generally arcuate groove shape and supporting a pivot pin 18 in cooperation with a support groove 1c described later is cut out along the axial direction of the crankshaft 12. there is The cam ring 4 is supported within the pump accommodating portion 11 of the housing body 1 so as to be able to swing about a pivot pin 18 . At a position opposite to the pivot portion 4a with respect to the center of the cam ring 4, an arm portion 4b linked to a first coil spring 5, which is an urging member to which a predetermined set load W1 is applied, is attached to the cam ring 4. It protrudes from the outer peripheral surface in the radial direction of the cam ring 4 and extends into the spring accommodating chamber 23 . One side of the arm portion 4b facing the first coil spring 5 is always in contact with the tip of the first coil spring 5, so that the arm portion 4b and the first coil spring 5 are linked.

The first coil spring 5 is housed in a spring housing chamber 23 provided at a position facing the pivot pin 18 . In the spring accommodating chamber 23, the first coil spring 5 compressed by a predetermined set load W1 elastically contacts one end wall of the spring accommodating chamber 23 and one side portion of the arm portion 4b. The other end wall of the spring accommodating chamber 23 has a stopper surface 23a that restricts the movement range of the cam ring 4 in the eccentric direction. , the maximum movement of the cam ring 4 in the eccentric direction is restricted.

The first coil spring 5 thus provided moves the cam ring 4 through the arm portion 4b with an elastic force based on the set load W1 in a direction in which the eccentricity thereof increases (counterclockwise direction in FIG. 1). always energized. As a result, when the pump is not operated, the cam ring 4 is in a state where the other side of the arm portion 4b is pressed against the stopper surface 23a of the spring accommodating chamber 23 by the spring force of the first coil spring 5. The cam ring 4 is held at a position where the amount of eccentricity is maximized.

The ring member 6 has an outer diameter smaller than that of the rotor 2 and is slidably arranged in a circular recess 2b provided in the rotor 2. As shown in FIG.

The first and second sealing means 7A, 7B are attached to the cam ring 4 and separate the cam ring 4 and the housing body 1 from each other.

The first sealing means 7A is composed of a first sealing member 14 made of a fluorine-based resin material having low friction properties and formed into an elongated plate shape along the axial direction, and a rubber member formed into an elongated cylindrical shape along the axial direction. and a first elastic member 15 . The first elastic member 15 presses the first seal member 14 against a first seal contact surface 11c, which will be described later, by elastic force. As a result, the liquid-tightness of the first control chamber 24, which will be described later, is always ensured.

Similarly, the second sealing means 7B is composed of a second sealing member 16 made of a fluorine-based resin material having low friction properties and formed into an elongated plate shape along the axial direction, and a rubber member formed into an elongated cylindrical shape along the axial direction. and a formed second elastic member 17 . The second elastic member 17 presses the second seal member 16 against a second seal contact surface 11d, which will be described later, by elastic force. As a result, the liquid-tightness of the second control chamber 25, which will be described later, is always ensured.

An arcuate support groove 1c is formed at a predetermined position of the inner peripheral wall of the pump accommodating portion 11 to support the cam ring 4 through a cylindrical pivot pin 18 so as to be able to swing.

Here, for convenience of the following description, a straight line passing through the center O1 of the first bearing hole 11b and the center of the support groove 1c (the center O2 of the pivot pin 18) is defined as "cam ring reference line M".

A first seal contact surface 11c is formed on the inner peripheral wall of the pump accommodating portion 11 in a region above the cam ring reference line M, with which the first seal member 14 is slidably contacted. The first seal contact surface 11c is a surface defined by a predetermined radius R1 from the center O2 of the pivot pin 18, as shown in FIG. The radius R1 is set to a circumferential length that allows the first seal member 14 to always slidably contact within the eccentric swing range of the cam ring 4 .

Similarly, on the inner peripheral wall of the pump accommodating portion 11, a second seal contact surface 11d is formed in a region below the cam ring reference line M, with which the second seal member 16 is slidably contacted. The second seal contact surface 11d is a surface defined by a predetermined radius R2 larger than the radius R1 from the center O2 of the pivot pin 18, as shown in FIG. The radius R2 is set to a circumferential length that allows the second seal member 16 to always slidably contact within the eccentric swing range of the cam ring 4 .

As shown in FIG. 1, the outer periphery of the cam ring 4 has first and second seal surfaces facing the first and second seal contact surfaces 11c and 11d. The first and second seal holding portions 4c and 4d protrude respectively. Here, the first and second seal surfaces are defined by predetermined radii slightly smaller than the radii R1 and R2 forming the corresponding seal contact surfaces 11c and 11d from the center O2 of the pivot pin 18, respectively. there is A small clearance is formed between each seal surface and each seal contact surface 11c, 11d. First and second seal holding grooves 4e and 4f having a U-shaped cross section are formed along the axial direction of the cam ring 4 in the seal surfaces of the seal holding portions 4c and 4d, respectively. First and second seal means 7A and 7B, which come into contact with the first and second seal contact surfaces 11c and 11d when the cam ring 4 eccentrically swings, are held in the first and second seal holding grooves 4e and 4f, respectively. there is

In addition, on the bottom surface 11a of the pump accommodating portion 11, a suction port 19, which is an arcuate concave suction portion, and a discharge port 20, which is also an arcuate concave discharge portion, are provided in the outer peripheral region of the first bearing hole 11b. They are notched so as to face each other with the bearing hole 11b interposed therebetween. The intake port 19 is located on the opposite side of the support groove 1c on the bottom surface 11a, while the discharge port 20 is located on the support groove 1c side. The suction port 19 opens in a region (suction region) where the internal volume of the pump chamber 22 (described later) increases due to the pump action of the pump structure 21 (described later). The intake port 19 communicates with an intake port 8 b provided on the side surface of the cover member 8 . As a result, the oil stored in the oil pan of the internal combustion engine (not shown) flows through the suction port 8b and the suction port 19 based on the negative pressure generated by the pumping action of the pump structure 21 to each of the suction regions, which will be described later. It is sucked into the pump chamber 22 .

The pump assembly 21 is composed of the rotor 2 , the vanes 3 and the ring member 6 arranged inside the cam ring 4 . When the pump assembly 21 is rotationally driven, the oil sucked from the intake port 19 is discharged from the discharge port 20, and the movement of the cam ring 4 changes the flow rate of the oil discharged from the discharge port 20. It's becoming

The discharge port 20 opens in a region (discharge region) where the internal volume of the pump chamber 22 decreases due to the pumping action of the pump structure 21 . The discharge port 20 communicates with a later-described discharge passage opening 29 c positioned on the outer peripheral portion of the cover member 8 via a later-described discharge passage 37 provided in the cover member 8 . As a result, the oil pressurized by the pump action and discharged to the discharge port 20 flows through the discharge passage 37, the discharge passage opening 29c, and the main oil gallery, to each sliding portion and valve timing of the internal combustion engine (not shown). It is supplied to a device or the like.

The first control chamber 24 is connected to a feedback passage opening 28c (to be described later) communicating with the main oil gallery, and to the electromagnetic valve 9 . The first control chamber 24 is provided between the inner periphery of the pump accommodating portion 11 and the outer periphery of the cam ring 4 . The first control chamber 24 presses the cam ring 4 in the direction of decreasing the eccentricity against the spring force of the first coil spring 5 by hydraulic pressure (control pressure) supplied to the inside. In other words, the oil discharged from the discharge port 20 is guided to the first control chamber 24 to apply a force to the cam ring 4 in the direction of reducing the volumetric change of the pump chamber 22 .

The second control chamber 25 is connected to the solenoid valve 9 . The second control chamber 25 is provided between the inner circumference of the pump accommodating portion 11 and the outer circumference of the cam ring 4 so as to face the first control chamber 24 . The second control chamber 25 assists the spring force of the first coil spring 5 with the hydraulic pressure supplied to the inside, and presses the cam ring 4 in the direction in which the amount of eccentricity increases. In other words, the oil discharged from the discharge port 20 is guided to the second control chamber 25 to apply a force to the cam ring 4 in the direction of increasing the volume change of the pump chamber 22 .

The cover member 8 is formed by aluminum die casting from a metallic material such as an aluminum alloy material. The cover member 8 has its outer peripheral portion, more specifically, a position radially outside the second bearing hole 8 a that bears the crankshaft 12 and adjacent to the valve holding portion 26 that holds the solenoid valve 9 . It has an oil passage connecting portion 27 for connection with an oil passage that communicates with the oil gallery. The oil passage connecting portion 27 includes first to third cylindrical portions 28 to 30 having a bottomed cylindrical shape projecting along the axial direction of the crankshaft 12 from the outer surface 8c, which is the surface exposed to the outside of the cover member 8. have. The oil passage connecting portion 27 has a machined surface 8d formed by machining the distal ends of the first to third cylindrical portions 28 to 30 provided relatively close to each other so that they are flush with each other using a tool such as a milling cutter. are doing. This machined surface 8d is a flat surface perpendicular to the axial direction of the crankshaft 12, and serves as a mating surface with a block (not shown) having an oil passage communicating with the main oil gallery.

The first cylindrical portion 28 has a circular first recess 28a recessed toward the outer surface 8c with respect to the processed surface 8d. The bottom surface 28b of the first recess 28a has a circular feedback passage opening 28c that opens to the bottom surface 28b and guides hydraulic pressure from the main oil gallery of the internal combustion engine as control pressure to the first control chamber 24 and the solenoid valve 9. is formed with an opening. The feedback passage opening 28c is positioned above a discharge passage opening 29c and a sealing member arrangement opening 35, which will be described later, that is, on the far side from the valve holding portion 26. As shown in FIG. A metal first connection pipe 31 for connection with an oil passage provided in a block (not shown) is press-fitted and fixed to the inner peripheral surface of the feedback passage opening 28c.

The second cylindrical portion 29 is provided closer to one side wall 10a of the chain case 10 than the first cylindrical portion 28, and is connected to the outer circumference of the first cylindrical portion 28 via the first intermediate portion 32. there is The second cylindrical portion 29 has a circular second recess 29a recessed toward the outer surface 8c with respect to the processed surface 8d. A bottom surface 29b of the second recess 29a is opened to the bottom surface 29b, and main oil is discharged via a discharge port 20, a communication hole 40 formed through the cam ring 4, and a discharge passage 37, which will be described later. A circular discharge passage opening 29c leading to the oil gallery is formed. As shown in FIG. 2, the center O3 of the discharge passage opening 29c is closer to the center O5 of the second bearing hole 8a than the center O4 of the circular feedback passage opening 28c ( It is positioned far from the axis of rotation of the pump assembly 21). A metal second connection pipe 33 is press-fitted and fixed to the inner peripheral surface of the discharge passage opening 29c for connection with an oil passage provided in a block (not shown).

The third cylindrical portion 30 is positioned between the first cylindrical portion 28 and the valve retaining portion 26 . The third cylindrical portion 30 is formed with a circular sealing member arrangement opening 35 that opens to the processing surface 8d and in which a metallic sealing member 34 is arranged. The sealing member arrangement opening 35 is opened at a position where the later-described seal portion 44 and the sealing member arrangement opening 35 overlap in the opening direction. As shown in FIG. 2, the center O6 of the sealing member disposition opening 35 is located more than the center O4 of the feedback passage opening 28c and the center O3 of the discharge passage opening 29c when viewed from the direction perpendicular to the processing surface 8d. It is located near the center O5 of the second bearing hole 8a. Four crimping portions are provided at equal intervals in the circumferential direction of the sealing member arrangement opening 35 at the inner peripheral position of the sealing member arrangement opening 35 in which the later-described seal portion 44 of the cover member 8 is arranged. A metallic sealing member 34 is crimped at 36a-36d. Between the sealing member 34 and the seal portion 44, a partial area of a discharge passage 37, which will be described later, through which oil discharged from the discharge portion of the pump component 21 flows is formed. The three crimped portions 36a, 36c, and 36d are provided at portions of the peripheral wall 30a of the sealing member placement opening 35 that are reinforced by reinforcing portions 70 that protrude radially outward from the peripheral wall 30a. The reinforcing portion 70 bulges radially outward from a region of the peripheral wall 30a extending from the vicinity of the first cylindrical portion 28 to the valve holding portion 26 in an arc shape, and is integrated with the outer surface 8c. The portion of the peripheral wall 30a reinforced by the reinforcing portion 70 has relatively high rigidity, and is a portion that is less likely to deform when a load is applied when the sealing member 34 is crimped. One crimping portion 36b is provided at a portion reinforced by a third intermediate portion (reinforcing portion) 39, which will be described later. The portion of the peripheral wall 30a reinforced by the third intermediate portion 39 also has relatively high rigidity, and is a portion that is less likely to deform when a load is applied when the sealing member 34 is crimped.

Conventionally, on the inner peripheral surface of the sealing member arrangement opening 35, four crimping portions 36a' to 36d' provided at equal intervals in the circumferential direction of the sealing member opening 35 were made of metal. of the sealing member 34 was crimped. However, conventionally, since the crimped portion 36b' is provided in the central portion of the passage portion 42 in the circumferential direction of the sealing member arrangement opening 35, the portion immediately below the crimped portion 36b' is hollow and has a thick portion. Since it is far from the clogged reinforcing portion 70 and the third intermediate portion (reinforcing portion) 39, there is a risk that cracks will occur in the vicinity of the caulked portion 36b'. Similarly, since the crimped portion 36d′ is provided in the central portion of the discharge port 20 in the circumferential direction of the sealing member arrangement opening 35, there is a cavity directly below the crimped portion 36d′ and is far from the reinforcing portion 70. Therefore, cracks may occur near the crimped portion 36d'. Therefore, in this embodiment, as described above, the caulked portion 36a is provided on the boundary portion between the discharge port 20 and the reinforcing portion 70 filled with meat, and the caulked portion 36b is provided on the sealing member arrangement opening 35. The crimped portion 36c is provided on the clockwise rotation side of the central portion (conventional crimped portion 36b') of the passage portion 42 in the circumferential direction, and the crimped portion 36c is formed between the passage portion 42 and a solid third intermediate portion (reinforcing portion) 39. or provided on the counterclockwise side of the central portion (conventional crimped portion 36b') of the passage portion 42 in the circumferential direction of the sealing member arrangement opening 35, and the crimped portion 36d is provided on the clockwise side of the central portion of the discharge port 20 in the circumferential direction of the sealing member arrangement opening 35 (conventional crimping portion 36d').

Furthermore, the third cylindrical portion 30 is connected to the outer circumference of the first cylindrical portion 28 via the second intermediate portion 38, and is connected to the outer circumference of the second cylindrical portion 29 via the third intermediate portion 39. there is The third intermediate portion 39 has a recessed groove portion 39a that is recessed with respect to the processing surface 8d.

Further, as shown in FIG. 2, the discharge passage opening 29c, the feedback passage opening 28c, and the sealing member arrangement opening 35 are located at the center of the discharge passage opening 29c when viewed from a direction perpendicular to the processing surface 8d. An imaginary line connecting O3, the center O4 of the feedback passage opening 28c, and the center O6 of the sealing member arrangement opening 35 is provided so as to form a triangle.

The discharge passage opening 29c and the discharge port 20 indicated by the dashed line in FIG.

The discharge passage 37 is configured as a series of passages extending from the second cylindrical portion 29 through the third intermediate portion 39 to the third cylindrical portion 30 . That is, the discharge passage 37 is a passage portion 42 formed across the inner space 41 of the second cylindrical portion 29, the peripheral wall 29d of the second cylindrical portion 29, the third intermediate portion 39, and the peripheral wall 30a of the third cylindrical portion 30. (indicated by a dashed line in FIG. 2) and an internal space 43 (a space closed by the sealing member 34) of the third cylindrical portion 30 form a series of passages. The discharge passage 37 extends across the third cylindrical portion 30 along the outer circumference of the cam ring 4 when viewed from the direction perpendicular to the machining surface 8d as shown in FIG. indicated by a dashed line). More specifically, the discharge passage 37 is separated from the first control chamber 24 via a later-described seal portion 44 integrally formed with the cover member 8 , and is positioned closer to the first control chamber 24 than the first control chamber 24 in the axial direction of the crankshaft 12 . It intersects with the first control chamber 24 by being arranged on the sealing member 34 side.

FIG. 4 is a front view showing the vicinity of the sealing member placement opening 35 with the sealing member 34 removed. 5 is a cross-sectional perspective view taken along line AA of FIG. 2. FIG.

As shown in FIGS. 4 and 5, the cover member 8 is fixed to the housing body 1 by bolts 13 with the mating surface 8e of the cover member 8 in contact with the body mating surface 1d of the housing body 1. As shown in FIGS. Between the cover member 8 and the housing main body 1 facing each other, the discharge passage 37 is connected by the inner space 41 of the second cylindrical portion 29, the passage portion 42, and the inner space 43 of the third cylindrical portion 30. It is constructed as a passage of

The internal space 41 of the second cylindrical portion 29 communicates with the discharge passage opening 29c, and the axial end portion of the second cylindrical portion 29 opposite to the discharge passage opening 29c from the discharge passage opening 29c. is continuous along the axial direction of the crankshaft 12 to the bottom portion 8f formed in the . The internal space 41 and the discharge passage opening 29c are formed by casting out a first opening forming portion 60 of a first mold 56, which will be described later, so as to leave the bottom portion 8f.

The inner space 43 of the third cylindrical portion 30 extends in the axial direction opposite to the sealing member 34 of the third cylindrical portion 30 from the sealing member 34 crimped to the inner peripheral surface of the sealing member arrangement opening 35 . It is continuous along the axial direction of the crankshaft 12 up to a substantially rectangular plate-shaped seal portion 44 formed at the end portion. The internal space 43 is expanded toward the discharge port 20 by an expansion portion 30 c provided on the inner peripheral surface of the third cylindrical portion 30 and communicates with the discharge port 20 through the communication hole 40 of the cam ring 4 . The internal space 43 and the sealing member placement opening 35 are formed by casting out a first mold 56 and a second mold 57 to be described later so as to leave the seal portion 44 .

The seal portion 44 has a first pressure portion which is the first control chamber 24 in the pump accommodating portion 11 and a second pressure portion between the seal portion 44 and the sealing member 34 having a different pressure from the first pressure portion. As shown in FIG. 5, it is provided at a position facing the sealing member 34 crimped to the sealing member placement opening 35 . As shown in FIG. 4, the seal portion 44 connects a first region 30d, which is a partial region of the inner peripheral surface of the third cylindrical portion 30, and a second region 30e facing the first region 30d. It is roughly rectangular in shape. Both longitudinal ends of the seal portion 44 and the first and second regions 30d and 30e are connected via corner R portions 45a and 45b. The width of the seal portion 44 is set wider than the width of the first control chamber 24 . In a state where the seal portion 44 seals the space between the discharge passage 37 and the first control chamber 24, the facing surface 44a of the seal portion 44 facing the housing body 1 is one side surface of the cam ring 4, as shown in FIG. 4g and the body mating surface 1d of the housing body 1 are in contact with each other.

The sealing member 34 is formed in the shape of a lid as a whole, and includes a circular plate-shaped bottom wall portion 34a and an annular peripheral wall portion 34b vertically rising from the outer peripheral edge of the bottom wall portion 34a. have. The sealing member 34 is placed in the sealing member arrangement opening 35 with the bottom wall part 34 a positioned on the seal part 44 side, and then placed at equal intervals in the circumferential direction of the inner peripheral surface of the sealing member arrangement opening 35 . It is crimped by four crimping portions 36a to 36d (see FIGS. 2 and 4) provided in the . That is, the sealing member 34 is arranged in the sealing member arrangement opening 35 in the above posture, and then the crimping portion 36 is provided at one position on the inner periphery of the sealing member arrangement opening 35 where the seal portion 44 is arranged. Then, it is crimped by crimping portions 36b, 36c, and 36d which are substantially adjacent to the edge side of the seal portion 44 at the inner peripheral position of the sealing member arrangement opening 35 where the seal portion 44 is not arranged. Specifically, when viewed from the opening direction of the sealing member opening 35, the sealing member 34 overlaps the corner R portion 45a of the seal portion 44 in the circumferential direction of the inner peripheral surface of the sealing member opening 35. and a crimped portion provided at a position that does not overlap with the seal portion 44 but is substantially adjacent to the corner R portion 45a of the seal portion 44 (a position closer to the edge of the corner R portion 45a). 36b and crimping portions 36c and 36d provided at positions that do not overlap with the seal portion 44 but are substantially adjacent to the corner R portion 45b of the seal portion 44 (positions closer to both edge portions of the corner R portion 45b). is fixed to the sealing opening 35 by the .

The passage portion 42 is provided between the third intermediate portion 39 and the peripheral walls 29d and 30a of the second and third cylindrical portions 29 and 30 integrally formed with the third intermediate portion 39, and the housing body 1. The internal space 41 of the second cylindrical portion 29 and the internal space 43 of the third cylindrical portion 30 are communicated with each other. The passage portion 42 is formed by casting a second mold 57, which will be described later.

The discharge passage 37 configured as described above guides the oil flowing through the discharge port 20 and the communication hole 40 to the discharge passage opening 29c. The oil guided to the discharge passage opening 29c is discharged to the main oil gallery through an oil passage provided in a block (not shown).

FIG. 6(a) is a plan view showing the internal state of the variable displacement oil pump when the solenoid valve 9 is energized, and FIG. 6(b) is a variable displacement oil pump when the solenoid valve 9 is not energized. It is a top view which shows the internal state of a pump. FIG. 7 is a plan view of the variable displacement oil pump showing the flow of oil in the variable displacement oil pump.

As indicated by arrow B in FIG. 7, the hydraulic pressure discharged from the discharge passage opening 29c is supplied to the main oil gallery (M/G). Further, the hydraulic pressure supplied to the main oil gallery is supplied to the feedback passage opening 28c as indicated by arrow C in FIG. The hydraulic pressure supplied to the feedback passage opening 28c is guided to the first control chamber 24 as indicated by the dashed arrow D in FIG. 7 and to the solenoid valve 9 as indicated by the dashed arrow E in FIG. .

The solenoid valve 9 includes a valve portion 47 for supplying and discharging oil according to the axial position in the moving direction of the spool valve 50, which will be described later, and a solenoid portion 48 for controlling the axial position of the spool valve 50 by energization. ing.

The valve portion 47 includes a generally cylindrical valve body 49, a spool valve 50 slidably disposed within the valve body 49, a stopper 51 fixed to the inner peripheral portion of the valve body 49, and the stopper 51. and a second coil spring 53 arranged between the retainer 52 and the spool valve 50 with a predetermined set load W2 applied thereto.

The solenoid section 48 has a connector 54 connected to one end of a harness (not shown). The solenoid portion 48 can move integrally with the movable core (not shown) as the movable core (not shown) is attracted to the fixed core (not shown) by an electromagnetic force generated when a coil (not shown) is energized through the connector 54. A rod 55 presses the spool valve 50 toward the retainer 52 against the biasing force of the second coil spring 53 .

Hydraulic pressure is supplied to the first control chamber 24 from the main oil gallery through the feedback passage opening 28c, as indicated by the dashed arrow C in FIG. As a result, the first pressure receiving surface 4h formed by the outer peripheral surface of the cam ring 4 facing the first control chamber 24 receives the hydraulic pressure introduced from the feedback passage opening 28c, and the biasing force of the first coil spring 5 is applied. A rocking force (moving force) is applied in a direction (clockwise direction in FIGS. 6A, 6B, and 7) to reduce the eccentricity of the cam ring 4. As shown in FIG.

On the other hand, the second control chamber 25 is also appropriately introduced according to the axial position of the spool valve 50 which is changed by the ON/OFF operation of the solenoid valve 9 to which hydraulic pressure is supplied via the feedback passage opening 28c (Fig. Dashed arrow in F of 7). As a result, the second pressure receiving surface 4i formed by the outer peripheral surface of the cam ring 4 facing the second control chamber 25 receives the hydraulic pressure introduced through the solenoid valve 9 and increases the eccentricity of the cam ring 4. A swinging force (moving force) is applied (counterclockwise in FIGS. 6(a), 6(b), and 7).

In such a variable displacement oil pump, as shown in FIG. 6(a), when the coil of the solenoid valve 9 is energized, the hydraulic pressure from the main oil gallery is led to the first control chamber 24, while the second control chamber 25 Hydraulic pressure from is discharged outside through an electromagnetic valve 9 .

Further, as shown in FIG. 6B, when the coil of the solenoid valve 9 is energized, the hydraulic pressure from the main oil gallery is guided to the first control chamber 24, and is supplied to the second control chamber 25 via the solenoid valve 9. led to.

FIG. 8 is a cross-sectional view of a first mold 56 and a second mold 57 used for manufacturing the oil passage connection portion 27 of the variable displacement oil pump.

The first mold 56 is provided on the side of the outer surface 8c of the cover member 8 opposite to the mating surface 8e with the housing body 1 in the metal material pouring process and casting process, which will be described later. The first mold 56 forms the oil passage connecting portion 27 in cooperation with the second mold 57 provided on the mating surface 8e side. The first mold 56 includes a relatively long and continuous first flat plate portion 58, and a first projecting portion 59 formed integrally with the first flat plate portion 58 and protruding vertically from the first flat plate portion 58, the first It has an opening forming portion 60 , a second opening forming portion 61 and a second projecting portion 62 .

The first protruding portion 59 protrudes from one end portion 58a of the first flat plate portion 58 toward the second mold 57 side. It has a first protrusion tip surface 59 a that contacts the third protrusion tip surface 66 a of the portion 66 .

The first opening forming portion 60 is a portion that forms the second concave portion 29a, the discharge passage opening 29c, and the internal space 41 of the second cylindrical portion 29 by casting the first mold 56 in a casting step described later. is. The first opening forming portion 60 has a generally cylindrical shape, and is separated from the first flat plate portion 58 toward the other end portion 58b of the first flat plate portion 58 at a position spaced from the first protrusion portion 59 toward the second mold 57. protruding to the side. As shown in FIG. 8 , the projection length of the first opening forming portion 60 is longer than the projection length of the first projection portion 59 . The outer peripheral surface of the first opening forming portion 60 has a draft so as to facilitate casting in a casting step described later. Therefore, the outer diameter of the first opening forming portion 60 is set so as to gradually decrease from the root portion 60a toward the tip surface 60b. The tip surface 60b contacts the opposite end surface 67c of the stepped portion 67b of the passage portion forming portion 67, which will be described later, while being mated with the second mold 57. As shown in FIG. A recess forming portion 60c that forms the second recess 29a of the second cylindrical portion 29 is provided in a stepped manner around the root portion 60a.

The second opening forming portion 61 is a portion that forms the sealing member arrangement opening 35 and the internal space 43 of the third cylindrical portion 30 by casting the first mold 56 in a casting step described later. The second opening forming portion 61 has a substantially cylindrical shape, and extends from the first flat plate portion 58 at a position spaced from the first opening forming portion 60 toward the other end portion 58 b of the first flat plate portion 58 . It protrudes toward the mold 57 side. As shown in FIG. 8, the distance D1 between the first opening forming portion 60 and the second opening forming portion 61 along the first flat plate portion 58 is equal to the distance D1 of the first projection along the first flat plate portion 58. It is longer than the distance D2 between 59 and the first opening forming portion 60 . Furthermore, the protruding length of the second opening forming portion 61 is slightly longer than the protruding length of the first opening forming portion 60 . The second opening forming portion 61 includes a large diameter portion 61a integrally formed with the first flat plate portion 58 and a small diameter portion 61b integrally formed with the large diameter portion 61a and having an outer diameter smaller than that of the large diameter portion 61a. and have The large-diameter portion 61a has a first contact surface 61c that contacts a flat surface 67g of a passage forming portion 67, which will be described later, in a state of contact with the second mold 57, and a first contact surface 61c in a state of contact with the second mold 57. It has a second contact surface 61d that comes into contact with a tip surface 68a of an extended portion forming portion 68, which will be described later. The small-diameter portion 61b is provided at a position shifted toward the one end portion 58a of the first flat plate portion 58 with respect to the axis of the large-diameter portion 61a. The small-diameter portion 61b has a tip surface 61e that abuts on a second opposing end surface 67e of a stepped portion 67d of a passage portion forming portion 67, which will be described later, while being mated with the second mold 57. As shown in FIG. The outer peripheral surface of the small-diameter portion 61b has a draft so as to facilitate casting in a casting process, which will be described later. Therefore, the outer diameter of the small-diameter portion 61b is set so as to gradually decrease from the boundary portion 61f with the large-diameter portion 61a toward the tip surface 61e.

Further, between the first opening forming portion 60 and the second opening forming portion 61, the concave groove portion 39a of the third intermediate portion 39 is formed on the flat surface 63 of the first flat plate portion 58 on the side of the second mold 57. A recessed groove forming portion 64 to be formed is integrally provided.

The second protruding portion 62 protrudes from the other end portion 58b of the first flat plate portion 58 toward the second mold 57 side, and when mated with the second mold 57, the second protruding portion 62 protrudes from the opposite surface of the second flat plate portion 65 which will be described later. It has a second protruding portion tip surface 62a that abuts on 65c. As shown in FIG. 8 , the projection length of the second projection 62 is longer than the projection lengths of the first projection 59 , the first opening forming portion 60 and the second opening forming portion 61 . Furthermore, as shown in FIG. 8, the distance D3 between the second protrusion 62 and the second opening forming portion 61 along the first flat plate portion 58 is the distance between the first opening along the first flat plate portion 58 and the distance D3. It is shorter than the distance D1 between the forming portion 60 and the second opening forming portion 61 .

The second mold 57 is formed integrally with a second flat plate portion 65 having a length corresponding to the first flat plate portion 58 of the first mold 56 and the second flat plate portion 65 A third projecting portion 66, a passage portion forming portion 67 and an extension portion forming portion 68 protrude vertically from.

The third projecting portion 66 projects from one end portion 65a of the second flat plate portion 65 toward the first mold 56 side. has a third protrusion tip surface 66a that abuts on the first protrusion tip surface 59a.

The passage portion forming portion 67 is a portion that forms the passage portion 42 spanning the second cylindrical portion 29, the third intermediate portion 39, and the third cylindrical portion 30 by casting the second casting mold 57 in the casting step described later. is. The passage portion forming portion 67 is formed in a substantially rectangular parallelepiped shape, and is spaced apart from the third projecting portion 66 toward the other end portion 65b of the second flat plate portion 65, and extends from the second flat plate portion 65 toward the first mold 56 side. protruding to As shown in FIG. 8 , the projection length of the passage portion forming portion 67 is longer than the projection length of the third projection portion 66 . The passage portion forming portion 67 has a tip end surface 67 a facing the concave groove portion forming portion 64 of the first mold 56 . A stepped portion 67 b that connects the passage portion forming portion 67 and the second flat plate portion 65 in a stepped manner is formed at a position facing the third projecting portion 66 of the passage portion forming portion 67 . The stepped portion 67b has a first opposing end surface 67c that abuts against the tip end surface 60b of the first opening forming portion 60 of the first mold 56 in a state of mating with the first mold 56. As shown in FIG. Further, a stepped portion 67 d that connects the passage portion forming portion 67 and the second flat plate portion 65 in a stepped manner is formed at a position facing the extension portion forming portion 68 of the passage portion forming portion 67 . The stepped portion 67d has a second opposing end face 67e that abuts on the tip end face 61e of the second opening forming portion 61 of the first mold 56 when mated with the first mold 56. As shown in FIG. In addition, a recessed portion 67f is provided on the edge portion of the distal end surface 67a of the passage portion forming portion 67 on the side of the extension portion forming portion 68. As shown in FIG. The recessed portion 67f has a flat surface 67g that abuts against the first contact surface 61c of the second opening forming portion 61 of the first mold 56 when the first mold 56 is mated.

In addition, the outer peripheral portion of the passage portion forming portion 67 has a draft angle in order to facilitate casting in a casting step to be described later. In other words, the outer peripheral portion of the passage portion forming portion 67 is the length (the second flat portion 65) gradually decreases from the second flat plate portion 65 toward the tip surface 67a.

The extended portion forming portion 68 is a portion that forms the extended portion 30 c of the third cylindrical portion 30 and part of the internal space 43 of the third cylindrical portion 30 . The extension forming portion 68 protrudes from the second flat plate portion 65 toward the first mold 56 at a position spaced apart from the passage forming portion 67 toward the other end portion 65b of the second flat plate portion 65 . The extended portion forming portion 68 has a tip surface 68a that is formed on the same plane as the flat surface 67g of the passage portion forming portion 67. As shown in FIG. The extended portion forming portion 68 has a stepped portion 68b that connects the extended portion forming portion 68 and the facing surface 65c of the second flat plate portion 65 in a stepped manner.

A groove portion 69 recessed in a rectangular shape with respect to the second opposing end surface 67e is formed between the extension forming portion 68, the second flat plate portion 65, and the stepped portion 67d. This groove portion 69 forms a seal portion 44 with the front end surface 61e of the small diameter portion 61b by the metal material poured in the metal material pouring process described later.

FIG. 9 is a process diagram showing a metal material pouring process among a plurality of processes of a method of manufacturing a variable displacement oil pump. FIG. 10 is a process diagram showing a casting process among a plurality of processes of a method of manufacturing a variable displacement oil pump. 11A and 11B are process diagrams showing a process of assembling the cover member 8 to the housing body 1 among a plurality of processes of the manufacturing method of the variable displacement oil pump.

First, prior to forming the cover member 8 by aluminum die casting, the above-described first mold 56 and second mold 57 are prepared. At this time, the first mold 56 is arranged on the outer surface 8c side of the cover member 8 opposite to the mating surface 8e with the housing body 1, and the second mold 57 is arranged on the mating surface 8e side. At this time, the first projection 59, the first opening forming portion 60, the second opening forming portion 61 (first projection) and the second projection 62 of the first mold 56 face downward. While arranging the mold 56, the second mold 57 is placed with the third projecting portion 66, passage portion forming portion 67 (second projection) and extension portion forming portion 68 (second projection) of the second mold 57 facing upward. 57 is placed.

Then, as shown in FIG. 9, the first mold 56 and the second mold 57 are butted against each other. In a state in which the first mold 56 and the second mold 57 are butted against each other, the first projecting portion tip surface 59a of the first projecting portion 59 and the third projecting portion tip surface 66a of the third projecting portion 66 are in contact with each other. The tip surface 60b of the opening forming portion 60 and the first opposing end surface 67c of the stepped portion 67b are in contact with each other, and the first contact surface 61c of the large diameter portion 61a and the flat surface 67g of the passage portion forming portion 67 are in contact with each other. Furthermore, in this state, the tip surface 61e of the small diameter portion 61b and the second opposing end surface 67e of the stepped portion 67d, the second contact surface 61d of the large diameter portion 61a and the tip surface 68a of the extended portion forming portion 68, and The second protruding portion tip surface 62a of the second protruding portion 62 and the opposing surface 65c of the second flat plate portion 65 are in contact with each other.

Next, in the metal material pouring step, a cavity formed between the first mold 56 and the second mold 57 through a gap (not shown) between the first mold 56 and the second mold 57 An aluminum alloy material having fluidity is poured into the inside. When a predetermined time elapses after this pouring, the aluminum alloy material hardens between the first mold 56 and the second mold 57 .

After hardening the aluminum alloy material, as shown in FIG. Cast downward. After the casting process, the discharge passage opening 29c and the internal space 41 are formed by the first opening forming portion 60, and the second recess 29a is formed by the recess forming portion 60c. After the casting process, the sealing member arrangement opening 35 is formed by the large diameter portion 61a of the second opening forming portion 61, and the internal space 43 is formed by the small diameter portion 61b of the second opening forming portion 61 and the expanded portion. The sealing portion 44 is formed by the forming portion 68 and the tip surface 61 e of the second opening forming portion 61 and the groove portion 69 of the second mold 57 . Further, after the casting process, the passage portion 42 communicating between the internal spaces 41 and 43 is formed by the passage portion forming portion 67, and the expanded portion 30c of the third cylindrical portion 30 and part of the internal space 43 form the expanded portion. formed by a portion 68;

After the casting process, the inner peripheral surfaces of the discharge passage opening 29c and the sealing member arrangement opening 35 are finished by a tool (not shown), such as a drill, in order to remove burrs and the like generated by the casting process.

Furthermore, in addition to the inner peripheral surfaces of the discharge passage opening 29c and the sealing member arrangement opening 35, the inner wall surface of the passage portion 42 and the like are finished.

Next, using a tool such as a milling cutter, a machined surface 8d is formed in the oil passage connection portion 27 to be a mating surface with a block (not shown) having an oil passage communicating with the main oil gallery.

Next, in the step of assembling the cover member 8 to the housing body 1, the cover member 8 is assembled to the housing body 1 with bolts (not shown). After the cover member 8 is assembled, as shown in FIG. 11, the discharge passage 37 and the first control chamber 24, which are perpendicular to each other when viewed from the direction perpendicular to the machined surface 8d, are sealed by the sealing portion 44. As shown in FIG. Furthermore, after the cover member 8 is assembled, the discharge port 20 communicates with the expanded portion 30c and the internal space 43 through the communication hole 40 of the cam ring 4, as shown in FIG.

Then, the second connecting pipe 33 is press-fitted into the inner peripheral surface of the discharge passage opening 29c, and the inner peripheral surface of the sealing member arrangement opening 35 is sealed with four crimping portions 36a to 36d (see FIG. 2). The member 34 is crimped. The press-fitting of the second connection pipe 33 and the crimping of the sealing member 34 may be performed before the cover member 8 is assembled to the housing body 1 .

As described above, in the present embodiment, the sealing member 34 is sealed by the crimping portions 36a to 36d formed in the inner peripheral position of the sealing member arrangement opening 35 in which the sealing portion 44 is arranged in the cover member 8. It is fixed to the stop member placement opening 35 . A discharge passage 37 is formed between the sealing member 34 and the seal portion 44, through which the oil discharged from the discharge portion of the pump component 21 flows. Therefore, the first control chamber 24 can be opened only by crimping the sealing member 34 with the crimping portions 36a to 36d without using a core that can be collapsed and removed after the cover member 8 is formed by aluminum die casting. A crossing discharge passage 37 can be easily formed. Therefore, the cover member 8 having the discharge passage 37 can be manufactured at low cost.

Further, in the present embodiment, the tip of the first cylindrical portion 28, the tip of the second cylindrical portion 29, and the tip of the third cylindrical portion 30 are provided at relatively close positions on the oil passage connecting portion 27. It has a machined surface 8d machined into the same plane by a milling cutter. This machined surface 8d serves as a mating surface with a block having an oil passage that communicates with the main oil gallery. By milling the tips of the first to third cylindrical portions 28 to 30 to form the processing surface 8d in this manner, the first to third cylindrical portions 28 to 30 may be located far from each other or may be on the same plane. The machined surface 8d can be easily formed by one-time machining as compared with the case where the machined surface cannot be formed in one step. Therefore, productivity of the cover member 8 can be improved.

Furthermore, in this embodiment, the sealing member 34 is crimped to the inner peripheral surface of the sealing member arrangement opening 35 . For this reason, compared to the case where the sealing member 34 is fixed to the inner peripheral surface of the sealing member arrangement opening 35 using a fixing member such as a bolt, an extra processing step such as forming a bolt hole is omitted, and the fixing member can be easily mounted. A sealing member 34 can be fixed. Furthermore, the fixation by crimping does not require a separate bolt or the like, so that the manufacturing cost of the variable displacement oil pump can be reduced.

In addition, in the present embodiment, the sealing member 34 has portions (crimped portions 36a, 36c, 36d) reinforced by reinforcing portions 70 integrated with the cover member 8 in the peripheral wall 30a of the sealing member arrangement opening 35. , and the portion (crimped portion 36b) reinforced by the third intermediate portion 39 is crimped. These parts have relatively high rigidity and are parts that are difficult to deform due to the load generated when the sealing member 34 is crimped. Therefore, it is possible to suppress the deformation of the peripheral wall 30a to create a gap between the sealing member 34 and the peripheral wall 30a, and prevent oil from leaking from this gap to the oil passage communicating with the main oil gallery.

Furthermore, in this embodiment, the discharge passage 37 is formed by casting out the first mold 56 and the second mold 57 . Therefore, since the discharge passage 37 is already formed when the first and second molds 56 and 57 are cast, the discharge passage can be easily formed as compared with the case where the discharge passage is formed by drilling after aluminum die casting. 37 can be formed. Also, the process of drilling the discharge passage 37 can be omitted, and the manufacturing time of the variable displacement oil pump can be shortened.

As a variable displacement oil pump based on the embodiment described above, for example, the following modes are conceivable.

As one aspect of the variable displacement oil pump, the variable displacement oil pump includes a housing provided therein with a pump accommodating portion having an opening, an adjusting ring movably provided in the pump accommodating portion, and an inner periphery of the adjusting ring The pump structure discharges the oil sucked from the suction part by being rotationally driven from the discharge part, and the flow rate of the oil discharged from the discharge part changes when the adjustment ring moves. a body, a control chamber provided between the inner periphery of the pump accommodating portion and the outer periphery of the adjustment ring to which a control pressure is introduced, a seal portion for sealing the control chamber, and the seal portion and the seal portion are overlapped in an opening direction. a cover member that has an opening that opens at a position and that is attached to the housing to seal the opening of the pump accommodating portion; It is fixed to the opening by a crimped portion formed in at least a part of the sealing portion, and a discharge passage is formed between the seal portion and the discharge passage through which the oil discharged from the discharge portion of the pump structure flows. and a stopping member.

In a preferred aspect of the variable displacement oil pump, the crimping portion for fixing the sealing member to the opening is provided on the edge side of the seal portion at the inner peripheral position of the opening where the seal portion is not arranged. It is also formed at another position closer to the

In another preferred aspect, in any one of the aspects of the variable displacement oil pump, the crimping portion is provided at one location on the inner circumference of the opening where the seal portion is arranged and at one location on the inner circumference of the opening where the seal portion is not arranged. They are formed at three substantially adjacent locations on the edge side of the seal portion at the inner peripheral position of the opening portion.

In another preferred aspect, in any one of the aspects of the variable displacement oil pump, the outer peripheral portion of the housing is arranged in the main oil gallery for introducing the pressure of the main oil gallery of the internal combustion engine as the control pressure to the control chamber. a first cylindrical portion having a feedback passage opening that communicates with the pump structure; a second cylindrical portion having a discharge passage opening that guides oil discharged from the pump structure to the outside; and the opening to which the sealing member is fixed. and a third cylindrical portion provided with a portion, and the distal end portion of the first cylindrical portion, the distal end portion of the second cylindrical portion, and the distal end portion of the third cylindrical portion are flush with each other.

As a method of manufacturing the oil pump based on the embodiment described above, for example, the following modes are conceivable.

A pump accommodating portion having an opening is provided inside, and the pump accommodating portion seals a housing that accommodates a pump structure that discharges the sucked oil to the outside, and a first pressure portion in the pump accommodating portion. a cover member having an opening opening at a position overlapping the seal portion in the opening direction, the cover member sealing the opening of the pump accommodating portion by being attached to the housing; a sealing member fixed to the opening and forming a second pressure portion having a pressure different from that of the first pressure portion between the seal portion and the seal portion; The member is combined with a first mold having a first projection for forming a space from the opening to the seal portion, and the first mold from the side opposite to the direction in which the first projection protrudes. combining a second mold provided with a second projection for forming the second pressure portion together with the first projection, and pouring a metal material into the cavity formed therebetween; and a step of removing the sealing member from the second mold and securing the sealing member in the opening to receive the pump assembly within the pump receiving portion of the housing and to replace the cover member with the By fixing to the housing, the seal portion seals the first pressure portion of the pump arrangement and the second pressure portion is introduced between the seal portion and the sealing member.

In a preferred aspect of the method for manufacturing the oil pump, the sealing member is fixed by crimping a plurality of locations in the opening of the cover member in the circumferential direction.

In another preferred aspect, in any of the aspects of the oil pump manufacturing method, the sealing member is crimped at least at a position overlapping the seal portion when viewed from the opening direction of the opening.

In another preferred aspect, in any one of the aspects of the method for manufacturing an oil pump, the sealing member is positioned substantially adjacent to the seal portion in addition to the position overlapping the seal portion when viewed from the opening direction of the opening. It can also be crimped in another position where it fits.

In another preferred aspect, in any one of the aspects of the oil pump manufacturing method, the outer peripheral portion of the housing includes the main oil for introducing the pressure of the main oil gallery of the internal combustion engine as the control pressure to the control chamber. A first cylindrical portion having a feedback passage opening communicating with the gallery, a second cylindrical portion having a discharge passage opening for leading the oil discharged from the pump structure to the outside, and the sealing member being fixed to the and a third cylindrical portion provided with an opening, and the distal end portion of the first cylindrical portion, the distal end portion of the second cylindrical portion, and the distal end portion of the third cylindrical portion are simultaneously processed into a flat shape.

REFERENCE SIGNS LIST 1 housing body 4 cam ring 8 cover member 8d machined surface 10 chain case 11 pump accommodating portion 20 discharge port 24 ... first control chamber, 25 ... second control chamber, 27 ... oil passage connection portion, 28 ... first cylindrical portion, 28c ... feedback passage opening, 29 ... second Cylindrical portion 29c Discharge passage opening 30 Third cylindrical portion 34 Sealing member 35 Sealing member arrangement opening 37 Discharge passage 42 passage portion 44 sealing portion 36a to 36d caulking portion 56 first mold 57 second mold 60 first opening forming portion 61... Second opening portion forming portion, 67... Passage portion forming portion

Claims (9)

a housing having therein a pump accommodating portion having an opening;
an adjustment ring movably provided within the pump housing;
A pump structure provided on the inner periphery of the adjustment ring, which is driven to rotate and discharges oil sucked from the suction part from the discharge part, and when the adjustment ring moves, the oil is discharged from the discharge part. a pump arrangement that varies the flow rate of oil;
a control chamber provided between the inner periphery of the pump accommodating portion and the outer periphery of the adjustment ring and into which a control pressure is introduced;
a seal portion that seals the control chamber; and a cover member that has an opening that opens at a position overlapping the seal portion in an opening direction, and that is attached to the housing to seal the opening of the pump accommodating portion. ,
The pump structure is fixed to the opening by a crimping portion formed at least partially on the inner peripheral position of the opening where the seal portion of the cover member is arranged, and the pump structure is formed between the cover member and the seal portion. a sealing member formed with a discharge passage through which the oil discharged from the discharge part of the body flows;
Variable displacement oil pump with In the variable displacement oil pump according to claim 1,
A crimping portion for fixing the sealing member to the opening is also formed at another position closer to the edge of the seal portion in the inner peripheral position of the opening where the seal portion is not arranged. A variable displacement oil pump characterized by: In the variable displacement oil pump according to claim 2,
The caulking portion is substantially adjacent to one inner peripheral position of the opening where the seal portion is arranged and an edge portion side of the seal portion at an inner peripheral position of the opening where the seal portion is not arranged. A variable displacement oil pump characterized by being formed at three locations. In the variable displacement oil pump according to claim 1,
The outer peripheral portion of the housing includes a first cylindrical portion having a feedback passage opening communicating with the main oil gallery for introducing the pressure of the main oil gallery of the internal combustion engine as the control pressure to the control chamber; a second cylindrical portion having a discharge passage opening that guides oil discharged from the body to the outside; and a third cylindrical portion provided with the opening to which the sealing member is fixed,
A variable displacement oil pump, wherein the tip of the first cylindrical portion, the tip of the second cylindrical portion, and the tip of the third cylindrical portion are flush with each other. a housing in which a pump containing portion having an opening is provided inside, and in which a pump structure for discharging the sucked oil to the outside is contained in the pump containing portion;
It has a seal portion that seals the first pressure portion in the pump accommodating portion, and an opening portion that opens at a position overlapping the seal portion in the opening direction. a cover member for sealing;
a sealing member fixed to the opening of the cover member and forming a second pressure portion having a pressure different from that of the first pressure portion between the sealing portion and the sealing portion;
A method for manufacturing an oil pump comprising
The cover member includes a first mold having a first projection for forming a space from the opening to the seal portion, and the first mold from the side opposite to the direction in which the first projection protrudes. assembling a second mold with second projections for combining to form the second pressure portion with the first projections, and pouring a metallic material into the cavities formed therebetween; removing the sealing member from the first mold and the second mold and securing the sealing member in the opening;
By accommodating the pump assembly in the pump accommodating portion of the housing and fixing the cover member to the housing, the seal portion seals the first pressure portion of the pump assembly and the seal portion and the sealing member, wherein the second pressure portion is guided between the sealing member. In the method for manufacturing an oil pump according to claim 5,
The method of manufacturing an oil pump, wherein the sealing member is fixed by crimping a plurality of locations in the opening of the cover member in the circumferential direction. In the method for manufacturing an oil pump according to claim 6,
A method of manufacturing an oil pump, wherein the sealing member is crimped at least at a position overlapping with the sealing portion when viewed from the opening direction of the opening. In the method for manufacturing an oil pump according to claim 7,
A method of manufacturing an oil pump, wherein the sealing member is crimped not only at a position overlapping the seal portion but also at another position substantially adjacent to the seal portion when viewed from the opening direction of the opening. In the method for manufacturing an oil pump according to claim 5,
The oil pump has an adjustment ring that is movably provided in the pump accommodating portion and accommodates the pump assembly,
A control chamber is formed between the inner periphery of the pump accommodating portion and the outer periphery of the adjustment ring and into which a control pressure for moving the adjustment ring is introduced,
The outer peripheral portion of the housing includes a first cylindrical portion having a feedback passage opening communicating with the main oil gallery for introducing the pressure of the main oil gallery of the internal combustion engine as the control pressure to the control chamber; a second cylindrical portion having a discharge passage opening that guides oil discharged from the body to the outside; and a third cylindrical portion provided with the opening to which the sealing member is fixed,
A method of manufacturing an oil pump, wherein the tip of the first cylindrical portion, the tip of the second cylindrical portion, and the tip of the third cylindrical portion are processed into a flat shape at the same time.

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