JP2004360473A - Vane pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent seizure from occurring caused by contact friction between a rotor side face and a side plate by forming an oil sump recessed part in one side face of a vane pump rotor having both side faces supported by a pair of side plates and leading a part of the back pressure of delivery oil discharged from a pump chamber into the recessed part. <P>SOLUTION: This vane pump is formed so that both side faces 20A and 20B of the rotor 20 are held by the pair of side plates 30 and 40, a vane guide is fitted to one side plate 30, and a pair of arc groove holes are formed in the other side plate 40. In the vane pump, the part of the back pressure of the delivery oil discharged from the pump is led, through the arc groove holes, into the oil sump recessed part formed in one of the rotor side faces. Thus, since a clearance between the rotor side face 20B and the other side plate 40 is lubricated, seizure due to sliding contact between the rotor 20 and the side plate can be prevented. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a vane pump, and more particularly to an improved technique for a vane pump used in a CVT that is a continuously variable transmission for an automobile.
[0002]
[Prior art]
The rotor in the vane pump has a structure in which both side surfaces are sandwiched and covered by a pair of side plates, and among the pair of side plates, only one side plate is provided with a vane guide, and the other side plate is provided. Does not have a vane guide. For this reason, on the side plate side where the vane guide is not provided, the side surface of the rotor and the side plate face each other without intervening the vane guide. On the other hand, on the side plate side provided with the vane guide, an annular groove for the vane guide is formed on the side surface of the rotor (for example, see Patent Document 1).
[0003]
[Patent Document 1]
Microfilm of Japanese Utility Model Application No. 57-159587 (Japanese Utility Model Application Laid-Open No. 59-64485) (pages 5 to 7, FIG. 3 to FIG. 5).
[0004]
[Problems to be solved by the invention]
As shown in FIGS. 10 to 12, the vane pump described in Patent Document 1 described above has a rotor 020 fixed to a drive shaft 05 connected to a drive unit of an internal combustion engine, and an outer peripheral portion of the rotor 020. A vane 021 that is movable back and forth in the radial direction and slides along an inner peripheral cam surface 012a of a cam ring 010 disposed outside the outer peripheral portion of the rotor 020, and both side surfaces of the rotor 020 and the cam ring 010. A pair of side plates (cover plate, side plate) 030 and 040 are provided so as to sandwich the same.
[0005]
A vane guide 032 for guiding the vane 021 is provided on one side plate (cover plate) 030 of the pair of side plates 030 and 040, and the vane guide 032 is provided on the one side plate. 030, the outer shape of which is similar to the inner peripheral cam surface 012a of the cam ring 010. On the other hand, the other side plate (side plate) 040 is not provided with such a vane guide.
[0006]
An annular groove 023 for accommodating the vane guide 032 is formed on one side surface of the rotor 020 facing one side plate (cover plate) 030 provided with the vane guide 032. The annular groove as described above is not formed on the other side surface of the rotor 020 facing the other side plate (side plate) 040 which is not provided, and the other side surface has a large area on the side plate 040 in that sense. Facing in the facing area.
[0007]
By the way, among the two side surfaces of the rotor, as described above, the one side surface faces the side plate provided with the vane guide, while the other side surface faces the side plate not provided with the vane guide. Therefore, the other side surface of the rotor facing the side plate on which the vane guide is not provided faces the side plate without interposing the vane guide or the annular groove for the vane guide. Therefore, it is conceivable that the side plate directly and strongly contacts the rotor side surface, and since the facing surface area is large, the oil film sometimes breaks, and seizure may occur due to the generation of frictional heat due to the sliding contact.
[0008]
Therefore, in order to solve the above-described problem, it is proposed to arrange the side plates provided with the vane guides on both sides of the rotor facing each other, but the side plates provided with the vane guides on both sides of the rotor are proposed. The arrangement of the plate causes an increase in the size of the pump unit.
[0009]
In addition, annular grooves for accommodating the vane guides must be formed on both side surfaces of the rotor, and the formation of such annular grooves increases the number of groove formation portions in the rotor structure. Increases directly weakens the rotor structure and reduces the strength of the rotor itself. In order to maintain proper strength of the rotor, it is necessary to increase the thickness of the rotor itself, which results in an increase in the size of the rotor and an increase in the size of the pump.
[0010]
In the situation described above, the vane guide is interposed only on one side of the rotor without disposing the side plates provided with the vane guides on both sides of the rotor. The rotor structure in which an annular groove is provided only on one side surface of the rotor is assumed, and sliding between the side surface and the side plate on the other side surface of the rotor facing the side plate where the vane guide is not provided is provided. There is a need for the development of an improved vane pump structure that can effectively prevent seizure due to contact.
[0011]
Means for Solving the Problems and Effects of the Invention
The present invention relates to an improved structure of a vane pump for solving the above-mentioned problems, and more particularly to an improvement for preventing seizure due to sliding contact with a side plate on a rotor side surface facing a side plate on which a vane guide is not provided. With respect to the structure, a cam ring having a cam surface on an inner peripheral surface, a rotor to which a drive shaft is inserted and fixed and a plurality of vanes slidingly contacting the cam surface are mounted and arranged inside the cam ring, A vane pump having a drive shaft inserted therein and a pair of side plates disposed on both sides of the cam ring and the rotor and sandwiching both sides of the cam ring and the rotor, wherein one of the pair of side plates is A vane guide projecting from the plate surface is provided on a surface of the side plate facing the rotor side surface. A groove for supplying back pressure oil of a pump is provided on a surface of the side plate facing the rotor side surface, and the side plate faces the one side plate of the two side surfaces sandwiched between the pair of side plates of the rotor. An annular groove for accommodating the vane guide is formed on a side surface of the vane guide, and a lower opening of the vane groove for mounting the vane and an oil passage on the side surface facing the other side plate. A storage recess is formed.
Further, a slot for supplying the back pressure oil of the pump is a pair of arc-shaped slots formed at point-symmetric positions with respect to a center point of the side plate, and the slots are provided on both sides of the side plate. A penetrating through-hole and a hole formed by a chamfer of the through-hole are formed, and both the through-hole and the hole are formed with the lower side opening of the vane groove of the rotor and the oil. It is characterized in that it communicates with the storage recess.
Further, the oil reservoir recess of the rotor is formed in a shape having a wide portion located at a radially outer portion of the rotor and a narrow portion located at a radially inner portion of the rotor. The narrow portion communicates with a through-slot portion and an enlarged portion of the slot.
[0012]
The invention according to claim 1, wherein in the vane pump, a vane guide protruding from the plate surface is provided on a surface of one of the pair of side plates facing the rotor side surface, and the other side plate is provided. A groove for supplying back pressure oil of a pump is provided on a surface facing the side surface of the rotor, and a side surface facing the one side plate among the two side surfaces sandwiched between the pair of side plates of the rotor. An annular groove in which the vane guide is housed is formed, and a lower opening of the vane groove for mounting the vane and an oil reservoir for communicating with the groove hole are formed on a side surface facing the other side plate. Since the concave portion is formed,
On one side of the rotor, the contact with the one side cover is reduced by the reduction of the facing surface area due to the interposition of the vane guide and the presence of the annular groove therefor, and on the other side of the rotor, The back-pressure oil of the pump is supplied into the recess for oil sump through the slot, and the oil filled in the recess is effectively introduced and supplied to the gap between both the rotor side surface and the other side plate. Forming a continuous oil film in the gap, smooth rotation of the rotor is promoted, generation of frictional heat due to sliding contact is suppressed, pump damage due to seizure is reliably prevented, and pump operating efficiency is improved. Is done.
Furthermore, since the side plates provided with the vane guides are not arranged on both sides of the rotor, the pump unit can be prevented from being enlarged, and there is no need to provide vane guide grooves on both sides of the rotor. Therefore, the strength of the rotor is maintained without any loss, and the safety of the pump operation is ensured.
[0013]
According to a second aspect of the present invention, in the first aspect of the present invention, a pair of arc-shaped grooves are formed at positions symmetrical with respect to a center point of the side plate, wherein a slot for supplying back pressure oil of the pump is provided. A slot formed by a through hole penetrating the front and back surfaces of the side plate and a chamfered portion of the through slot; Are connected to the lower opening of the vane groove and the concave portion for oil sump of the rotor, so that the arc-shaped groove and the expanded portion are efficiently connected to the lower opening of the vane groove and the concave portion for oil sump. Back pressure oil is supplied, and the back pressure oil supplied to the lower side opening of the vane groove pushes the vane outward from below, and the upper part securely contacts the cam surface of the cam ring inner peripheral surface. I'm sullen. In addition, since the back pressure oil supplied to the oil reservoir recess is supplied from the through-hole portion and the expanded portion of the slot, the oil is efficiently supplied to the gap between the rotor side surface and the side plate and the lubrication thereof. The effect is improved, and the occurrence of seizure in the gap is almost completely prevented.
[0014]
According to a third aspect of the present invention, in the invention according to the second aspect, the oil reservoir concave portion of the rotor has a wide portion located at a radially outer portion of the rotor and a width located at a radially inner portion of the rotor. The narrow portion is formed in a shape having a narrow portion, and the narrow portion communicates with the through-slot portion and the widened portion of the slot. The reliable supply of oil to the narrow portion of the oil sump recess through the widened hole portion ensures reliable and uniform oil supply in the radial direction between the rotor and the side plate. , A uniform oil film is formed, and the lubricating effect is improved.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described below with reference to FIGS.
First, an outline of the structure of the vane pump P according to the present embodiment will be described with reference to FIGS.
[0016]
The vane pump P includes a pump unit U, a housing H including a body 1 as a first housing portion and a cover 2 as a second housing portion, and a body H sandwiched between the body 1 and the cover 2 and a plurality of bolts B 1 and a seal plate 3 integrally joined together with the cover 2. The cover 2 has a concave portion 2b that is opened at the mating surface 2a with the seal plate 3, and the concave portion 2b is covered with the seal plate 3, thereby forming a storage chamber 4 in which the pump unit U is stored.
[0017]
The drive shaft 5 of the vane pump P, which is rotationally driven by the power of an internal combustion engine (not shown), is attached to the body 1 on the base end side where the mounting portion 5a of the power transmission member for transmitting the power of the crankshaft of the internal combustion engine is provided. It is rotatably supported by the housing H via a fixed sliding bearing 6 and a sliding bearing 7 fixed to the bottom wall 2c forming the housing chamber 4 on the tip end side.
[0018]
The pump unit U includes an annular cam ring 10 having an outer peripheral surface 11 formed of a cylindrical surface and an inner peripheral surface 12 having a shape approximating an ellipse, a rotor 20 disposed inside the cam ring 10, and a circumferential direction of the rotor 20. A plurality of vanes 21 respectively slidably fitted in the radial direction into a plurality of vane grooves 22 provided in the radial direction at equal intervals, and the side surfaces of the cam ring 10 and the rotor 20 on the body 1 side. There is provided a first side plate 30 to cover, and a second side plate 40 to cover side surfaces of the cam ring 10 and the rotor 20 on the cover 2 side.
[0019]
A pair of press-fit holes 31 and a second side plate 40 provided in the first side plate 30 penetrate in the rotation axis direction A1 through a pair of through holes 13 provided diametrically opposite to the cam ring 10. The rotor 20 is press-fitted or fitted into a pair of fitting grooves 41 provided on the cam ring 10, the rotor 20 is disposed inside the cam ring 10, and the cam ring 10 is clamped by the first and second side plates 30, 40. 10 and a pair of positioning pins 8 for aligning circumferential positions of both side plates 30 and 40.
[0020]
Further, the pump unit U constituted by integrating the cam ring 10, the rotor 20, the vane 21, and both side plates 30, 40 with both positioning pins 8 is inserted into the drive shaft 5 held in the body 1, The projections 8a, 8a of the positioning pins 8, 8 from the first side plate 30 are press-fitted into the pair of press-fit holes 3a of the seal plate 3 and the pair of press-fit holes 1a of the body 1, respectively. Fixed. Thereafter, the cover 2 is put on the body 1 and fastened with bolts B so that the second side plate 40 and the cover 2 are oil-tight by the O-ring 9.
[0021]
At the center of the rotor 20, a mounting hole 20b having a spline 20a formed on the peripheral wall surface is formed, and a spline 5b provided on the outer peripheral surface of the drive shaft 5 inserted into the mounting hole 20b is fitted to the spline 20a. Then, the drive shaft 5 and the rotor 20 are connected and fixed so as to be integrally rotatable.
[0022]
Further, the tip of each vane 21 is in sliding contact with a cam surface 12a formed on the inner peripheral surface 12 of the cam ring 10, and between the cam surface 12a and the outer peripheral surface of the rotor 20, the first and second vanes 21 are provided. The space sandwiched between the side plates 30 and 40 is partitioned by a plurality of vanes 21, so that a plurality of pump chambers 50 (see FIG. 1) including variable volume chambers whose volumes change according to the rotation of the rotor 20. It is formed.
[0023]
A part of the hydraulic oil discharged from each pump chamber 50 passes through an arc-shaped groove 42 formed in a second side plate 40 described later (see FIG. 5), and a side opening 22 a of each vane groove 22. Then, the groove at the bottom of the groove 22 is supplied to the slightly enlarged back pressure chamber 22c at the bottom of the vane groove 22 (see FIG. 6). Therefore, during operation of the vane pump P, each vane 21 is pushed radially outward in the vane groove 22 by the back pressure oil, and the tip of each vane 21 is pushed to the inner peripheral surface 12 of the cam ring 10. It is pressed against the formed cam surface 12a.
[0024]
A pair of first and second suction ports communicating with the pump chamber 50 and a pair of first and second discharge ports are provided at a position opposed to the cam ring 10 in the diametric direction and in a predetermined range in the circumferential direction. Ports are formed. However, the suction port and the discharge port are not clearly shown, and only a part of the discharge port 14 is shown in FIG.
[0025]
The hydraulic oil sucked from the suction port is pressurized in a pump chamber 50 which is a variable volume chamber partitioned by a plurality of vanes 21 moving forward and backward on the outer peripheral surface of the rotor 20 and both side plates 30 and 40, and clearly. Is supplied through a discharge port 14 or the like (not shown) or the like (see FIG. 1), and is supplied through a predetermined oil path, a control valve, or the like (not shown) for shift control in the CVT, which is a continuously variable transmission, and a part of it is supplied. Is supplied to the back pressure chamber 22c in the lower part of the vane groove 22 through the arc-shaped groove hole 42 of the second side plate 40 described later, and to the oil sump recess 24 described later of the side surface 20B of the rotor. Is also supplied (see FIG. 6).
[0026]
The outline of the structure of the vane pump in the present embodiment is as described above.
By the way, the rotor 20 is covered with the pair of first and second side plates 30 and 40 on both side surfaces 20A and 20B together with the cam ring 10 as described above and as shown in FIG. In the state where the rotor 20 is sandwiched between the side plates 30 and 40, more specifically, both side surfaces 20A and 20B are covered with the both side plates 30 and 40 with a very small gap. Drive rotation for operation is performed.
[0027]
As shown in FIGS. 3A and 3B, the first side plate 30 of the pair of side plates 30 and 40 covering the rotor 20 so as to sandwich the rotor 20 is a plate-like body having a predetermined thickness. The surface of the plate-like surface that does not face the rotor side surface 20A does not have any particular structural feature, but the surface that faces the side surface 20A of the rotor 20 has a vertical movement of the vane 21 caused by the rotation of the rotor 20. A vane guide 32 serving as a guide is provided. Reference numeral 33 denotes a communication port for hydraulic oil, and reference numeral 31 denotes a press-fit hole of the positioning pin 8.
[0028]
As shown in FIGS. 3A and 3B and FIGS. 4A and 4B, the vane guide 32 has an elliptical outer contour similar to the cam surface 12a of the inner peripheral surface 12 of the cam ring 10 described above. Are formed in a ring shape having an outer peripheral portion 32a and a perfect circular inner peripheral portion 32b. Therefore, the ring has a wide ring width as a whole in an elliptical long side direction 32c. This is a deformed ring in which the ring width is narrowed in a short side direction 32d orthogonal to the long side direction.
[0029]
The ring forming the vane guide 32 has a predetermined uniform thickness, and its surface 32e is flat. For example, a metal plate such as a steel plate is punched by press machining, and a treatment such as a heat treatment is appropriately performed. The hardness of the cam ring 10 is about 47 to 53, and the outer peripheral portion 32a similar to the cam surface 12a of the cam ring 10, that is, the sliding contact portion with the lower portion 21a of the vane 21 is smoothed by barrel finishing or the like. Has been.
[0030]
Then, as shown in FIGS. 3A and 3B, the vane guide 32 has its elliptical ring center O2 coincident with the center 01 of the first side plate 30, and furthermore, the vane guide 32 has The position of the ring formed on the surface of the plate 30 is adjusted in consideration of the positional relationship between the peripheral surface 12 and the cam surface 12a. A part in the thickness direction is fitted into the groove 30a having the same shape as the above, and is fixed to the plate 30 by fixing means such as caulking with the fixing pin 32f, and the fixing for the mounting by the pin 32f is performed. This is performed at two wide symmetrical positions 32g, 32g sandwiching the center of the elliptical ring in the long side direction 32c of the ring.
[0031]
After the pump unit U is assembled, the vane guide 32 attached to the first side plate 30 has a ring portion of the vane guide 32 projecting in the ring thickness direction into the annular groove 23 of the side surface 20A of the rotor 20, which will be described later. As shown in FIG. 7, the outer peripheral portion 32 a of the vane guide 32 moves forward and backward on the outer peripheral surface 32 a of the rotor 20 when the rotor 20 rotates in the annular groove 23, as shown in FIG. 7. Sliding contact is made with the lower portion 21a of the moving vane 21 so as to smoothly move the vane 21 up and down in the rotor 20 (see also FIG. 1).
[0032]
As shown in FIGS. 5A and 5B, the second side plate 40 is a plate-like body having a predetermined thickness, and the plate-like surface penetrates the front and back surfaces of the plate 40. The position on the same circumference symmetrical with respect to the point O3 with respect to the center O3 of the plate 40, that is, the lower side opening 22b of the side portion of the vane groove 22 formed on the side surface 20B of the rotor described later and the oil reservoir recess At a corresponding position (see FIG. 6) communicating with the opening at the lower part, a pair of arc-shaped slots 42 having a predetermined length are formed, and each of the slots 42 has the predetermined length in the circumferential direction. Is set. Incidentally, reference numeral 41 denotes a fitting groove for the positioning pin 8.
[0033]
The length of each arc-shaped slot 42 is substantially such that the arc-shaped opening by the slot 42 is two or three of the lower opening 22 b of the vane groove 22 in the rotor 20 and lubrication described later. The opening 42 communicates with two or three of the narrow portions 24b of the oil reservoir concave portion 24 at the same time (see the dotted line in FIG. 8), and the width of the slot 42 is relatively narrow. The slot 42 is composed of a through slot 42a penetrating the plate 40, and an enlarged section 42b in which an inner arc of the through slot 42a is chamfered (see FIG. 9). .
[0034]
As shown in FIGS. 8 and 9, the through groove 42 a of each arc-shaped slot 42 and the enlarged portion 42 b which is a chamfer of the through groove 42 a are formed in the vane groove 22 in the rotor 20. The lower opening 22b of the vane groove 22 communicates with the lower back pressure chamber 22c of the vane groove 22 via the lower opening 22b of the side opening 22a, and simultaneously communicates with the narrow portion 24b of the oil reservoir recess 24 of the rotor 20. The supply of the oil to the concave portion 24 is ensured.
[0035]
Each arc-shaped slot 42 has two or three vanes through the lower opening 22b of the two or three vane grooves 22 of the rotor 20 during the operation of the pump as described above. A part of the back pressure oil discharged from the pump chamber 50 can be simultaneously introduced into the back pressure chamber 22c at the bottom of the groove 22, and the back pressure oil is introduced into the back pressure chamber 22c at the lower part of the vane groove 22. An action is provided in which two or three vanes 21 are simultaneously pushed up from below, and the upper portions of the vanes 21 are constantly pressed against the cam surface 12 a of the inner peripheral surface 12 of the cam ring 10.
[0036]
Further, a part of the back pressure oil introduced from the arc-shaped slot 42 is formed on the side surface 20B of the rotor 20 through the slot 42 and the enlarged portion 42b which is a chamfer of the slot. Two or three oil sump recesses 24 are simultaneously supplied, and the oil supplied to these oil sump recesses 24 contributes to preventing friction due to sliding contact between the side surface 20B of the rotor 20 and the second side plate 40. Is what you do.
[0037]
The rotor 20 sandwiched and covered by the first and second side plates 30, 40 is illustrated in FIGS. 6A, 6B, and 6C, and a part of the structure is as described above. A mounting hole 20b provided for mounting to the drive shaft 5 (see FIG. 2) is provided at the center of the cylinder to form a ring-shaped cylindrical shape, and the cylindrical outer peripheral surface is arranged at equal intervals in the circumferential direction and radially. A groove 22 is provided to be provided to a plurality of vanes 21 that are directed to a depth reaching a substantially central portion of a thickness in a radial direction of the ring-shaped cylinder, and pass through between both side surfaces of the ring-shaped cylinder. ing.
[0038]
The ring-shaped cylindrical rotor 20 has an annular groove 23 that orbits a substantially central portion of the side surface 20A in the radial thickness on one side surface 20A facing the first side plate 30. The annular groove 23 is formed as a groove 23 that circulates on the same radius of a predetermined width on the side surface 20A.
[0039]
Accordingly, the annular groove 23 is a circular groove having a predetermined width, and the groove 23 is formed on the surface of the first side plate 30 as an ellipse similar to the cam surface 12a of the cam ring inner peripheral portion 12 provided to protrude from the surface. The groove 23 is provided for accommodating the vane guide 32 having a circular shape. For this reason, the circular annular groove 23 is provided for the accommodation thereof in consideration of the relative rotation with the elliptical vane guide 32. And a predetermined depth in consideration of the amount of protrusion of the vane guide 32.
[0040]
Incidentally, since the annular groove 23 is a groove formed so as to orbit along the side surface 20A with a predetermined width at a substantially central portion in the radial thickness of the side surface 20A of the rotor 20, the formation portion of the groove 23 is The lower side half of the vane groove 22 provided for the vane 21 (corresponding to the lower side opening 22b of the vane groove 22) competes with the side surface 20A. Therefore, the annular groove 23 is formed by substantially removing the lower half of the vane groove 22.
[0041]
The annular groove 23 has, at its bottom 23a, a lower opening 22b that is an opening extending from a position near the center of the cut-off side opening 22a of the vane groove 22 of the rotor 20 to a lower position. The outer peripheral portion 32a of the vane guide 32 of the first side plate 30 housed in the annular groove 23 after assembling the pump unit U is provided with the vane 21 in the vane groove 22. The lower portion 21a is in direct contact with the lower portion 21a (see FIG. 7). This structure stabilizes the lifting / lowering operation of the vane 21 during rotation of the rotor 20 and makes it smooth.
[0042]
As shown in FIGS. 6B and 6C, a plurality of relatively shallow recesses 24 are formed on the other side surface 20B of the rotor 20 facing the second side plate 40. Numeral 24 is used as an oil reservoir for lubrication, and its shape is directed outward in the radial direction of the rotor 20, and its upper portion is a wide portion 24a and its lower portion is a narrow portion 24b. The rotor 20 has a shape similar to that of the polished surface, and is formed on the side surface 20B of the rotor 20 at the same interval in the radial direction and just alternately with the vane groove 22.
[0043]
After assembling the pump unit U, as shown in FIG. 8, each of the circles of the second side plate 40 described above is simultaneously formed on the narrow portions 24b of the two or three concave portions 24 having a shape similar to the Takuma. The through-hole portion 42a of the arc-shaped slot 42 and the shallow lower opening portion 42b face each other and communicate with each other. Therefore, the pump chamber 50 introduced through the arc-shaped slot 42 as described above. A part of the back pressure oil flows into the two or three recesses 24 at the same time through the through-groove holes 42a and the widened portions 42b, and these recesses 24 are filled with oil. The oil is stably supplied to a slight gap between the side surface 20B of the rotor 20 and the second side plate 40, and a continuous oil film for lubrication is formed in the gap.
[0044]
The rotor 20 and the first and second side plates 30 and 40 each have the above-described structure. As described above, the rotor 20 having the vane 21 mounted inside the cam ring 10 is housed therein. By sandwiching both side surfaces of the cam ring 10 between the first and second side plates 30 and 40, the rotor 20 covers both side surfaces 20A and 20B thereof with the side plates 30 and 40. The above-described pump unit U is configured by being arranged on both side surfaces 20A and 20B of each of the above-mentioned surfaces so as to face each other and integrated.
[0045]
Then, by the arrangement of the first side plate 30 facing the first side plate 30 on the side surface 20A of the rotor after assembling the pump unit U, the side surface 20A of the rotor 20 facing the first side plate 30 as shown in FIG. A portion of the ring-shaped vane guide 32 having the elliptical outer peripheral portion 32a of the first side plate 30 projecting from the plate surface is housed in the annular groove 23 of the rotor 20.
[0046]
The outer peripheral portion 32a of the vane guide 32 supports the lower portion 21a of the vane 21 from below the vane 21 in the housed state. Accordingly, when the rotor 20 rotates, the lower portion 21a of the vane 21 is guided in sliding contact with the cam surface 12a of the cam ring inner peripheral surface 12 along the elliptical shape of the outer peripheral portion 32a of the vane guide 32, The lift 21 is moved up and down along the vane groove 22.
[0047]
8 and 9 show the side surface 20B of the rotor 20 facing the second side plate 40 by disposing the second side plate 40 on the rotor side surface 20B after the pump unit U is assembled. As described above, the pair of circular arc-shaped slots 42 of the second side plate 40 are formed through two or three lower side openings 22b of the vane grooves 22 respectively opening on the side surface 20B of the rotor at the point-symmetric positions. It communicates simultaneously with two or three bottom back pressure chambers 22c of the groove 22 and simultaneously communicates with two or three oil sump recesses 24 formed on the rotor side surface 20B.
[0048]
Therefore, a part of the oil discharged from the pump chamber 50 (see FIG. 1) in the operation of the vane pump P and the bottom back pressure chamber 22 c of the vane groove 22 at a plurality of point-symmetric positions through the pair of arc-shaped slots 42. At the same time, the water is supplied to the storage recess 24 in a well-balanced manner. Simultaneously with the supply, the expanded portion 42b formed as a chamfered portion in the arc-shaped slot 42 communicates simultaneously with the narrow portion 24b of the oil reservoir concave portion 24 at a plurality of point symmetric positions, and Oil is supplied from the hole 42b to the recess 24 simultaneously with the supply (see FIG. 9).
[0049]
By supplying oil to the bottom back pressure chamber 22c of the vane groove 22, the lower portion 21a of the vane 21 is pushed up as described above, and the upper portion of the vane 21 is brought into contact with the cam surface 12a of the inner peripheral surface 12 of the cam ring 10. The oil is supplied to the oil reservoir recess 24 so as to be efficiently and reliably supplied to the gap between the rotor side surface 20B and the second side plate 40 as described above. You.
[0050]
Since the embodiment of the present invention shown in FIGS. 1 to 9 has the above configuration, the rotor 20 sandwiched and covered by the first side plate 30 and the second side plate 40 has one side surface 20A. By the first side plate 30 having the vane guide 32, the other side surface 20B has an arcuate shape capable of supplying a partial back pressure oil of the pump discharge oil to the oil sump recess 24 formed on the side surface 20B. Since the second side plate 40 having the groove 42 is sandwiched and covered by the second side plate 40, seizure due to sliding contact between the rotor 20 and the side plates 30, 40 is effectively prevented. .
[0051]
Since the plurality of oil sump recesses 24 are formed on the side surface 20B of the rotor facing the second side plate 40, the oil retained and held in the oil sump recess 24 allows the oil to remain between the rotor 20 and the side plate 40. A continuous strong oil film is formed in a small gap between the rotor 20 and the rotor 20, and the smooth relative rotation between the rotor 20 and the side plate 40 is promoted. Damage to P is effectively prevented, and safe and smooth operation of the pump P is ensured, and its operation efficiency is improved.
[0052]
The oil is supplied to the oil sump recess 24 formed on the rotor side surface 20 </ b> B through the through groove 42 a of the arc-shaped groove 42 formed at a pair of point symmetric positions on the second side plate 40 and the chamfer thereof. The oil is supplied to the plurality of oil retaining recesses 24 that are point-symmetrical at the same time in a well-balanced manner, so that the oil is supplied to the oil reservoir recess 24. This is ensured, the oil is efficiently and uniformly supplied over the entire area of the slight gap between the rotor side surface 20B and the second side plate 40, and the lubrication efficiency is increased.
[0053]
The oil sump recess 24 formed on the rotor side surface 20B has a shape that is widened in the rotor 20 in a radially outward direction. Therefore, the shape characteristic and the widened portion 42b of the arc-shaped slot 42 are used. Along with the reliable supply of oil to the narrow portion 24b in the radial direction inside the oil reservoir concave portion 24, the small gap between the side surface 20B of the rotor 20 and the second side plate 40 is evenly and uniformly formed. Oil can be supplied reliably.
[0054]
Since the oil reservoir concave portion 24 is formed on the side surface 20B of the rotor 20, the side plate 40 facing the rotor side surface 20B where the oil reservoir concave portion 24 is formed can be in contact with the rotor side surface 20B without the vane guide 32. Since the above-described seizure is prevented, it is possible to prevent the pump unit U from being enlarged. Further, there is no need to form annular grooves 23 for the vane guides on both side surfaces 20A, 20B of the rotor 20, and the seizure between the rotor 20 and both side plates 30, 40 can be performed without impairing the strength of the rotor 20 at all. It can be almost completely eliminated.
[0055]
A vane 21 that moves forward and backward at an outer peripheral portion of the rotor 20 is guided in sliding contact with a lower portion 21a thereof by an outer peripheral portion 32a of a vane guide 32 provided on the first side plate 30, and the vane 21 maintains a stable state. To move up and down.
[0056]
Further, the sliding contact guide in the vertical movement of the vane 21 by the vane guide 32 is combined with the substantial reduction of the facing surface area by the annular groove 23 provided for the vane guide 32 on the rotor side surface 20A. The sliding contact between the first side plate 30 and the side surface 20A of the rotor 20 is relieved and mitigated, and seizure due to friction between the plate 30 and the side surface 20A of the rotor 20 is almost completely eliminated. .
[0057]
Other embodiments are possible instead of the embodiments of the present invention.
[0058]
In the embodiment of the present invention, a pair of arc-shaped slots 42 formed in the second side plate 40 are formed at positions symmetrical with respect to a point. However, the present invention is not limited to this. For example, a plurality of slots formed as appropriate and extending at equal intervals on the same circumference of the plate 40 may be used. Also, the length and width of the slot are appropriately selected.
[0059]
In the embodiment of the present invention, the oil reservoir concave portion 24 formed on the rotor side surface 20B has a shape substantially similar to the polishing, but the shape of the concave portion 24 does not depart from the gist of the present invention. It can be appropriately selected and adopted within a range that does not exist.
[Brief description of the drawings]
FIG. 1 is a view showing an appearance of a vane pump of the present invention, a part of which is shown broken.
FIG. 2 is a view showing a main structure of the vane pump according to the present invention, and is a sectional view taken along line AA in FIG.
3A and 3B are diagrams showing one side plate of the vane pump of the present invention, and FIG. 3A is a diagram showing a surface structure of the plate facing one side surface of the rotor, and FIG. It is BB sectional drawing in.
4A and 4B are diagrams showing the structure of the vane guide of the present invention, wherein FIG. 4A is a plan view, and FIG. 4B is a cross-sectional view taken along line CC of FIG.
5A and 5B are diagrams showing the other side plate of the vane pump of the present invention, wherein FIG. 5A is a diagram showing the surface structure of the plate facing the other side surface of the rotor, and FIG. It is DD sectional drawing in ().
6A and 6B are diagrams showing the structure of the rotor of the vane pump according to the present invention, wherein FIG. 6A is a diagram viewed from the direction of the arrow A in FIG. 6B, and FIG. (C) is a diagram viewed from the direction of arrow (b) in (b).
FIG. 7 is an explanatory diagram showing a face-to-face relationship between one side surface of the rotor and one side plate of the present invention.
FIG. 8 is an explanatory diagram showing a face-to-face relationship between the other side surface of the rotor and the other side plate in the present invention.
9 is an explanatory view showing a face-to-face relationship between the other side surface of the rotor and the other side plate in the present invention, and is a cross-sectional view taken along the line FF in FIG. 8;
FIG. 10 is a sectional view showing a main structure of a conventional vane pump.
11 is a view showing a main structure of a conventional vane pump, and is a sectional view taken along the line 0A-0A in FIG.
FIG. 12 is an exploded perspective view of a main structure of a conventional vane pump.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Body, 2 ... Cover, 3 ... Seal plate, 4 ... Storage chamber, 5 ... Drive shaft, 6, 7 ... Sliding bearing, 8 ... Positioning pin, 9 ... O-ring, 10 ... Cam ring, 11 ... Cam ring outer peripheral surface, 12 ... Cam ring inner peripheral surface, 12a ... Cam surface, 13 ... Through hole, 14 ... Discharge port, Reference numeral 20: rotor, 20a: spline, 20b: mounting hole, 20A, 20B: side surface of the rotor, 21: vane, 21a: bottom of vane, 22: vane groove, 22a ... Vane groove side opening, 22b ... Lower side opening, 22c ... Back pressure chamber at bottom of vane groove, 23 ... Circular groove, 23a ... Lower part, 24 ... Oil reservoir Recess, 24a: wide portion, 24b: narrow portion, 30: first side plate, 0a: groove-shaped portion, 31: press-fit hole, 32: vane guide, 32a: outer peripheral portion, 32b: inner peripheral portion, 32c: long side direction, 32d: short Side direction, 32e: exposed surface, 32f: fixed pin, 32g: wide symmetrical position, 40: second side plate, 41: fitting groove, 42: arc shape Slot, 42a: through-hole, 42b: widened, 50: pump chamber, P: vane pump, U: pump unit, H: housing, A1 ...・ Rotation axis direction.

Claims (3)

A cam ring having a cam surface on an inner peripheral surface, a rotor which is inserted and fixed to a drive shaft, and which is provided with a plurality of vanes slidingly contacting the cam surface and which is disposed inside the cam ring; A vane pump that is inserted and includes a pair of side plates disposed on both sides of the cam ring and the rotor and sandwiching both sides of the cam ring and the rotor,
A surface of one of the side plates facing the rotor side surface is provided with a vane guide projecting from the plate surface, and a surface of the other side plate facing the rotor side surface has a pump. Slots for supplying back pressure oil are provided,
An annular groove for accommodating the vane guide is formed on a side surface facing the one side plate, of the two side surfaces sandwiched between the pair of side plates of the rotor, and facing the other side plate. A vane pump, wherein a lower side opening of the vane groove for mounting the vane and an oil sump recess are formed on a side surface of the vane groove. The slot supplying the back pressure oil of the pump is a pair of arc-shaped slots formed at point-symmetric positions with respect to the center point of the side plate, and the slots penetrate the front and back of the side plate. A through hole formed by a chamfered portion of the through groove, and the through hole and the enlarged hole are both formed in the lower opening of the vane groove of the rotor and the oil reservoir. The vane pump according to claim 1, wherein the vane pump communicates with the recess. The oil reservoir recess of the rotor is formed in a shape having a wide portion located at a radially outer portion of the rotor and a narrow portion located at the radially inner portion of the rotor. 3. The vane pump according to claim 2, wherein the opening communicates with a through-slot portion and an enlarged portion of the slot.

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