JP5352552B2 - Oil pump structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To allow a sealing member for closing an opening end of a machined hole to be prevented from coming off reliably with a simple structure using an auxiliary machine approaching a pump casing, even if the machined hole opened to an outer end surface of the pump casing for forming an intake oil path and/or a discharge oil path is drilled in the pump casing, in an oil pump structure. <P>SOLUTION: For forming at least either of the intake oil path Li and the discharge oil path Lo, the machine hole H to be opened to the outer end surface of the pump casing C is drilled in the pump casing C. In the machined hole H, a sealing member P for closing an outer opening end Ha of the machined hole is liquid-tightly filled. On an outer end of the sealing member P, an outer end surface Bmf of the auxiliary machine B to be closely arranged to the pump casing C and connected to a transmission housing M is opposed. With the auxiliary machine B, the sealing member P is prevented from coming off from the machined hole H. <P>COPYRIGHT: (C)2012,JPO&amp;INPIT

Description

  The present invention relates to a pump casing coupled to a transmission housing that houses a transmission, a suction port and a discharge port that open to a pump chamber in the pump casing, and a suction port and a discharge port of the transmission housing. The present invention relates to an oil pump structure provided with a suction oil passage and a discharge oil passage that communicate with outlets, respectively.

  The pump casing of the oil pump includes a base member coupled to the transmission housing, a cover plate that forms an intake port and a discharge port, a pump body coupled to the base member with the cover plate interposed therebetween and having a pump chamber therein Is already known (for example, see Patent Document 1 below).

JP 2003-301929 A

  In the conventional oil pump structure, a cover plate formed of a sintered body or the like is specially interposed between the base member of the pump casing and the pump body, and suction is performed between the cover plate and the base member. Since the oil passage and the discharge oil passage are defined, there is a problem that the number of parts increases and the cost increases accordingly.

  Therefore, the cover plate is omitted, the suction oil passage and the discharge oil passage are provided so as to penetrate the inside of the base member, and a processing hole that opens a part of at least one of the oil passages on the outer end surface of the base member It is conceivable that the outer opening end of the processed hole is closed with a retrofitting sealing member. And, as the sealing member, for example, when a sealing bolt screwed and fastened to the outer opening end of the processed hole is used, the fastening portion (for example, a sealing washer, a threaded portion of the processed hole, etc.) Deformation and other factors may cause a reduction in the axial force of the sealing bolt, which in turn may result in a decrease in the sealing function. There is a problem that the cost increases.

  The present invention has been proposed in view of the above, and an object thereof is to provide a low-cost oil pump structure that can solve the above problem with a simple structure.

  In order to achieve the above object, a first aspect of the present invention is directed to a pump casing coupled to a transmission housing that houses a transmission, a suction port and a discharge port that open to a pump chamber in the pump casing, and the suction ports. And an oil pump structure having a suction oil passage and a discharge oil passage for communicating the discharge port with the suction port and the discharge port of the transmission housing, respectively, at least one of the suction oil passage and the discharge oil passage is formed. For this purpose, the pump casing is provided with a processing hole that opens in the outer end surface of the pump casing, and a sealing member that plugs the outer opening end of the processing hole in a liquid-tight manner is inserted into the processing hole. The outer end of the sealing member is disposed close to the pump casing and coupled to the transmission housing. Outer end surface of the accessory is not face that, characterized in that the exit from the processing hole of the sealing member is prevented by the accessory.

  According to a second aspect of the present invention, a pump casing coupled to a transmission housing that houses a transmission, a suction port and a discharge port that open to a pump chamber in the pump casing, and the suction port and the discharge port are connected to the transmission housing. In the oil pump structure having a suction oil passage and a discharge oil passage communicating with the suction port and the discharge port, respectively, in order to form at least one of the suction oil passage and the discharge oil passage, Is formed with a processing hole opened in the outer end surface of the pump casing, and a sealing member for liquid-tightly closing the outer opening end of the processing hole is inserted into the processing hole. A stopper wall facing the end and preventing the sealing member from coming out of the processing hole is provided on the transmission housing. Characterized in that it is formed in the body.

  According to a third aspect of the present invention, in addition to the structure of the first aspect of the invention, the auxiliary machine is capable of adjusting and supplying oil discharged from an oil pump to an automatic transmission housed in the transmission housing. It is a valve body with a built-in control valve.

  According to a fourth aspect of the present invention, in addition to the configuration of any of the first to third aspects, the pump casing includes a base member whose one side is coupled to the transmission housing, and the pump chamber. And a pump body coupled to the other side surface of the base member, wherein the suction oil passage and the discharge oil passage are provided in the pump casing so as to penetrate the inside of the base member. .

  According to the first aspect of the present invention, a simple structure using an auxiliary machine that is disposed close to the oil pump and coupled to the transmission housing is sealed from a machining hole that is a part of the suction oil passage or the discharge oil passage. The member can be reliably prevented from coming out, and according to the invention of claim 2, the sealing member can be reliably prevented from coming out with a simple structure using a stopper wall formed integrally with the transmission housing. Moreover, according to each of the inventions, when the sealing member is attached, it is only necessary to insert the sealing member into the outer opening end of the processing hole. Therefore, it is possible to greatly contribute to cost reduction and improvement of assembly workability.

  In particular, according to the invention of claim 3, the valve body for an automatic transmission which is desirably disposed adjacent to the oil pump can be used as a retaining means for the sealing member. By simply arranging the machined hole in the pump casing and the outer open end of the hole facing the valve body, the sealing member can be secured without significant changes in the layout of the existing oil pump and valve body. Can be obtained, which can contribute to further cost savings. In addition, the valve body is generally a strong pressure-resistant structure, and can stably and firmly receive the reaction force from the sealing member. Therefore, when the valve body is used as a retaining means for the sealing member, the body is specially used. There is no need to reinforce.

  In particular, according to the invention of claim 4, since the suction oil passage and the discharge oil passage are provided in the pump casing so as to penetrate the inside of the base member, a cover plate is specially provided between the base member and the pump body. Even without this, the suction oil passage and the discharge oil passage can be formed without difficulty in the base member itself, and the number of parts can be reduced accordingly, which can contribute to cost saving.

FIG. 2 is a longitudinal sectional view of an essential part showing a first embodiment of an in-vehicle power unit to which the present invention is applied (a sectional view taken along line 1-1 in FIG. 2) 2-2 line enlarged sectional view of FIG. The perspective view which shows an oil pump and its peripheral part (the perspective view seen from the 3 arrow of FIG. 1) 4-4 enlarged cross-sectional view of FIG. FIG. 5 is an enlarged sectional view taken along line 5-5. FIG. 2 is a view corresponding to FIG. 2 showing a state in which the pump body is removed from the base member in the pump casing. Sectional drawing which shows the principal part of 2nd Example of the vehicle-mounted power unit to which this invention is applied (FIG. 4 corresponding figure).

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  1 to 6 show a first embodiment of the present invention. In FIGS. 1 to 3, a power unit mounted on a vehicle body (not shown) of an automobile includes an engine E and a crank of the engine E. The shaft 1 includes an automatic transmission T whose input side is linked and coupled to the shaft 1 via a torque converter TC. The output side of the automatic transmission T is connected to the wheel side via a transmission mechanism (not shown). As the automatic transmission T, for example, a conventionally known belt-type continuously variable transmission or a gear-type automatic transmission having multiple speeds is used.

  The transmission case coupled to one side of the engine block 2 of the engine E includes a transmission housing M in which at least the automatic transmission T is accommodated. The transmission housing M includes the automatic transmission T and the torque converter TC. A partition wall Ma is formed integrally with each other. Further, on the wall surface of the partition wall Ma on the side of the automatic transmission T, hydraulic control for adjusting the pump casing C of the oil pump OP and the oil discharged from the oil pump OP and supplying it to the automatic transmission T and the torque converter TC. The valve body B incorporating the valve is joined and fixed so as to be close to each other and with the seal plate S sandwiched between the wall surfaces.

  The pump shaft 3 of the oil pump OP is linked and connected via a chain transmission mechanism 6 to a connecting shaft 5 that rotates integrally with a torque converter case 4 (particularly a pump impeller) of the torque converter TC. Are coupled to and connected to the crankshaft 1 and rotate integrally with the crankshaft 1. Accordingly, the oil pump OP is rotationally driven by the crankshaft 1 during the operation of the engine E.

  The chain transmission mechanism 6 is disposed along the wall surface of the partition wall Ma on the automatic transmission mechanism T side, and is supported rotatably on the partition wall Ma via a bearing and connected to the connection wall Ma. A drive sprocket 6a that is spline-fitted to the shaft 5, a driven sprocket 6b that is rotatably supported by a partition wall Ma via a bearing and is spline-fitted to the pump shaft 3, and between the sprockets 6a and 6b. It is comprised with the endless chain 6c suspended.

  In FIG. 1, reference numeral 7 denotes an output shaft of the torque converter TC, which is coupled to the input portion of the automatic transmission T, and reference numeral 8 denotes a stator (not shown) of the torque converter TC. A stator shaft that performs rotation prevention and delivers hydraulic oil between the torque converter TC and its control system, and is fixed to the partition wall Ma.

  Next, a specific structure of the oil pump OP will be described with reference to FIGS.

  The pump casing C of the oil pump OP includes a plate-like base member Cb whose one side surface is coupled to the partition wall Ma by a plurality of bolts b1, and a pump body Cp coupled to the other side surface of the base member Cb. Composed. And the pump body Cp is comprised by the pump body main body 10 by which one side surface is joined to the base member Cb, and the pump cover 11 joined to the other side surface of this pump body main body 10, These pump body main body 10 and The pump cover 11 is fastened to the base member Cb with a plurality of bolts b2.

  A concave surface 15 corresponding to the driven sprocket 6b of the chain transmission mechanism 6 is formed on the one side surface of the base member Cb (that is, the surface facing the partition wall Ma). The base member Cb is formed longer on the valve body B side than the pump body Cb.

  The pump body main body 10 is formed with circular holes 10a opened on both side surfaces thereof, and the outer periphery of an outer rotor 9o having a plurality of internal teeth on the inner periphery is rotatably fitted in the circular holes 10a. Furthermore, the outer teeth of the inner rotor 9i having a plurality of outer teeth smaller than the number of teeth of the outer rotor 9o mesh with the inner teeth of the outer rotor 9o, and the rotational centers of both the rotors 9i and 9o are offset by a predetermined amount. Yes.

  One end side in the axial direction of the circular hole 10a is closed by the pump cover 11, and the other end side in the axial direction is closed by the base member Cb, and one side surface of the base member Cb facing the circular hole 10a is closed. As shown in FIG. 6, the suction port i and the discharge port o of the oil pump OP are recessed in a circular arc shape concentric with the pump shaft 3 and shifted in phase in the circumferential direction.

  The pump shaft 3 is fitted and connected to the inner rotor 9i so as to rotate integrally, and both the rotors 9i, 9o rotate in conjunction with the rotation of the pump shaft 3, and at that time, both the rotors 9i , 9o, the pump chamber 12 defined between the opposed peripheral surfaces moves while changing the volume, and the oil suction action from the suction port i to the pump chamber 12 and the oil discharge from the pump chamber 12 to the discharge port o The effect is exhibited smoothly. This is based on the operation principle of a conventionally known trochoid pump, and further detailed description is omitted.

  On the wall surface of the transmission housing M on the automatic transmission T side, a suction port Mi and a discharge port Mo are opened at a position avoiding the chain transmission mechanism 6 (the driven sprocket 6b and the chain 6c). The suction port Mi communicates with an oil reservoir (not shown) in the transmission housing M, and the discharge port Mo communicates with a hydraulic pressure introduction portion of a hydraulic control valve (not shown) in the adjacent valve body B. The base member Cb is provided with a suction oil passage Li and a discharge oil passage Lo that allow the suction port i and the discharge port o to communicate with the suction port Mi and the discharge port Mo of the transmission housing M (partition wall Ma), respectively. .

  As shown in FIG. 5, the suction oil passage Li extends diagonally across the base member Cb so that the suction port Mi and the suction port i communicate linearly.

  On the other hand, as shown in FIG. 4, the discharge oil passage Lo communicates between the vertical hole H as a processing hole by drilling, which extends vertically through the base member Cb in the longitudinal direction, and the vertical hole H and the discharge port Mo. In the same manner, it is constituted by a horizontal hole H ′ by drilling. One end in the longitudinal direction of the vertical hole H opens to the outer end surface of the base member Cb, and the other end opens to the discharge port o. In addition, a plug P as a sealing member for closing the outer opening end Ha of the hole H is liquid-tightly inserted in the vertical hole H, and a valve body B as an auxiliary machine is inserted in the outer end of the plug P. The valve body B prevents the plug P from coming out of the vertical hole H.

  The plug P is composed of a cylindrical plug body Pm fitted to the inner peripheral surface of the vertical hole H, and a flange Pf integrally connected to the outer periphery of the outer end of the plug body Pm. An annular seal member 16 that is liquid-tightly pressed against the inner peripheral surface of the vertical hole H is fitted on the outer periphery of the intermediate portion. The flange portion Pf defines the insertion limit of the plug P into the vertical hole H by engaging the seat surface thereof with the outer end of the base member Cb.

  The valve body B includes a valve body main body Bm whose one side is coupled to the partition wall Ma of the transmission housing M by a plurality of bolts b3, and a body cover Bc that is coupled to the other side of the valve body main body Bm by a plurality of bolts b4. The hydraulic control valve is arranged in a space between the valve body main body Bm and the body cover Bc.

  The valve body main body Bm is die-cast in the illustrated example, and a slight draft is formed on the outer end surface Bmf for smooth die cutting. On the other hand, a spherical convex portion Pb is formed on the end surface of the plug P facing the outer end surface Bmf, whereby the contact between the outer end surface Bmf serving as an inclined surface and the end surface of the plug P is reduced. It is assumed that stress is relaxed at the contact portion between the two.

  Next, the operation of the embodiment will be described. During operation of the engine E, the oil pump OP is pumped by transmitting the output of the crankshaft 1 to the pump shaft 3 via the torque converter case 4, the connecting shaft 5, and the chain transmission mechanism 6. At this time, the oil pump OP enters the pump chamber 12 from an oil reservoir (not shown) in the transmission housing M through the suction port Mi of the housing M, the suction oil passage Li and the suction port i of the pump casing C (base member Cb). On the other hand, the oil discharged from the oil pump OP is supplied to the discharge port Mo of the transmission housing M through the discharge port o and the discharge oil passage Lo of the pump casing C (base member Cb). It passes through the partition wall Ma and is supplied to a hydraulic control valve (not shown) and a torque converter TC in the valve body B.

  By the way, the driven spline 6b and the chain 6c of the chain transmission mechanism 6 are interposed between the partition wall Ma corresponding to the oil pump OP and the oil pump OP. In other words, the suction port Mi and the discharge port Mo cannot be opened, that is, the suction port Mi and the discharge port Mo are slightly spaced outward from the oil pump OP in the radial direction as shown in the example (that is, driven). It is necessary to open at a position avoiding the spline 6b and the chain 6c. Therefore, in the present embodiment, the suction port i and the discharge port o located in the portion and the suction port Mi and the discharge port Mo on the transmission housing M side separated from the suction port i and the discharge port Mo are formed on the base member Cb longer than the pump body Cp. The suction oil passage Li and the discharge oil passage Lo that are provided are connected to each other. Moreover, in this embodiment, the suction oil passage Li and the discharge oil passage Lo have the oil passage structure as described above, and are formed so as to penetrate the base member Cb. Without specially providing a cover plate having a suction port and a discharge port between the pump bodies Cp, it is possible to easily form the suction oil passage Li and the discharge oil passage Lo in the base member Cb itself, and the number of parts is reduced accordingly. , Can contribute to cost savings.

  Further, in the above-described embodiment, the discharge oil passage Lo particularly has a vertical hole H as a processing hole that passes through the base member Cb in the longitudinal direction and opens to the outer end surface, as shown in FIG. A plug P that closes the outer opening end Ha is inserted into the vertical hole H in a liquid-tight manner, and a valve body is connected to the outer end of the plug P. Since the outer end surface Bmf of B is close and opposed, the valve body B can reliably prevent the plug P from coming out of the vertical hole H.

  Moreover, when the plug P is attached, the plug P is inserted into the vertical hole H previously drilled in the base member Cb in the assembly process of the oil pump OP, and the seating surface of the outer end flange portion Pf thereof is on the outer surface of the base member Cb. It is only necessary to insert it until it abuts, that is, it is not necessary to provide a screw part in the plug P and the vertical hole H or to tighten the plug P in particular, so that cost saving and assembly workability can be improved. . Then, the base member Cb of the oil pump OP in which the plug P has been assembled in this way and the valve body b incorporating the hydraulic control valve are coupled to a predetermined position of the partition wall Ma in a state where they are close to each other. , Fix.

  After that, when the oil pump OP is operated on a trial basis and the discharge pressure is applied to the discharge oil passage Lo, the plug P moves outward by the discharge pressure. When the plug P moves by a predetermined amount t until it comes into contact with the outer end surface Bmf of the body B, the valve body B reliably restricts further movement and withdrawal of the plug P.

  Thus, in this embodiment, the valve body B for an automatic transmission, which is desirable in terms of function to be disposed adjacent to or close to the oil pump OP, is also used as a retaining means for the plug P. . Therefore, the existing oil pump OP and the vertical hole H as the processing hole are simply disposed in the pump casing C (base member Cb) so that the outer open end Ha of the hole H faces the valve body B side. The plug P can be securely removed without significantly changing the layout of the valve body B, and further cost savings can be achieved.

  In addition, the valve body B is generally a strong pressure resistant structure, and can stably and firmly receive the reaction force from the plug P. Therefore, when the valve body B is also used as a retaining means for the plug P, There is no need for special reinforcement.

  Next, a second embodiment of the present invention will be described with reference to FIG. In the first embodiment described above, the auxiliary machine, that is, the valve body B is used as the retaining means for preventing the plug P as the sealing member from coming out of the processing hole H. In the embodiment, the stopper wall 20 formed integrally with the transmission housing M is used in place of the valve body B as the retaining means. That is, the stopper wall 20 that faces the outer end of the plug P and prevents the plug P from coming out of the processing hole H is integrally raised on the wall surface of the partition wall Ma on the automatic transmission T side, A side surface 20f of the stopper wall 20 facing the plug P is a stopper surface.

  Thus, according to the second embodiment, the plug P can be prevented from coming out of the processing hole H with a simple structure using the stopper wall 20 provided integrally with the transmission housing M (partition wall Ma). Therefore, the same effect as the first embodiment can be expected.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various design changes can be made without departing from the present invention described in the claims. Is possible.

  For example, in the above-described embodiment, among the suction port i and the discharge port o provided in the pump casing C (base member Cb), a part of the discharge port o is opened in the outer surface of the base member Cb (vertical hole H). In the present invention, the outer opening end Ha of the hole H is closed with a plug P as a sealing member. However, in the present invention, a part of the suction port i is formed with the same processed hole. Then, the outer open end of the hole may be closed with a plug, and both the ports i and o may have the same configuration.

  In the above embodiment, the oil discharged from the oil pump OP is regulated and supplied to the automatic transmission T and the torque converter TC. However, in the present invention, the oil discharged from the oil pump is supplied to the automatic transmission. Instead of (or in addition to) supplying to T or the torque converter TC, it may be supplied to the lubricated portion of the engine E or to the lubricated portion of the manual transmission.

  In the first embodiment, a hydraulic control valve that regulates the oil discharged from the oil pump OP and supplies it to the automatic transmission T is incorporated as an auxiliary device that also serves as a retaining means for the sealing member (plug P). Although the valve body B is illustrated, in the present invention, an auxiliary machine having another function, which is coupled to the transmission housing M adjacent to or close to the oil pump OP, may also be used as the retaining means.

B ... Valve body C as an auxiliary machine ... Pump casing Cb ... Base member Cp ... Pump body H ... Vertical hole Ha as machining hole ... Outward opening end i ... Oil pump suction port M ... Transmission housing Mi ... Suction port Mo ... Discharge port Li ... Suction oil passage Lo ... Discharge oil path o Oil pump discharge port P Plug T as sealing member Automatic transmission 12 Pump chamber 20 Stopper wall

Claims (4)

A pump casing (C) coupled to a transmission housing (M) that houses a transmission (T) is connected to a suction port (i) and a discharge port (o) that open to a pump chamber (12) in the pump casing (C). ), And a suction oil passage (Li) and a discharge oil passage (Lo) for communicating the suction port (i) and the discharge port (o) with the suction port (Mi) and the discharge port (Mo) of the transmission housing (M), respectively. In the oil pump structure provided with
In order to form at least one of the suction oil passage (Li) and the discharge oil passage (Lo), the pump casing (C) has a processing hole (H) opened in an outer end surface of the pump casing (C). ), And a sealing member (P) for closing the outer opening end (Ha) of the processing hole (H) is liquid-tightly inserted into the processing hole (H). ) Is opposed to the outer end surface (Bmf) of an auxiliary machine (B) that is disposed close to the pump casing (C) and coupled to the transmission housing (M). ) Prevents the sealing member (P) from coming out of the processed hole (H). A pump casing (C) coupled to a transmission housing (M) that houses a transmission (T) is connected to a suction port (i) and a discharge port (o) that open to a pump chamber (12) in the pump casing (C). ), And a suction oil passage (Li) and a discharge oil passage (Lo) for communicating the suction port (i) and the discharge port (o) with the suction port (Mi) and the discharge port (Mo) of the transmission housing (M), respectively. In the oil pump structure provided with
In order to form at least one of the suction oil passage (Li) and the discharge oil passage (Lo), the pump casing (C) has a processing hole (H) opened in an outer end surface of the pump casing (C). ), And a sealing member (P) for closing the outer opening end (Ha) of the processing hole (H) is liquid-tightly inserted into the processing hole (H). A stopper wall (20) that faces the outer end of the sealing member (P) and prevents the sealing member (P) from coming out of the processing hole (H) is formed integrally with the transmission housing (M). And oil pump structure.   The auxiliary machine (B) is a valve body having a built-in hydraulic control valve capable of regulating and supplying the oil discharged from the oil pump (OP) to the automatic transmission (T) in the transmission housing (M). The oil pump structure according to claim 1, wherein the oil pump structure is characterized. The pump casing (C) has a base member (Cb) whose one side is coupled to the transmission housing (M) and the pump chamber (12) inside, and is provided on the other side of the base member (Cb). A pump body (Cp) to be coupled,
The suction oil passage (Li) and the discharge oil passage (Lo) are provided in the pump casing (C) so as to penetrate the inside of the base member (Cb). The oil pump structure according to any one of the above.

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