JP6329009B2 - Oil pump mounting structure - Google Patents

Description

  The present invention relates to an oil pump mounting structure that is mounted on a case of a power unit.

  For example, multi-stage automatic transmissions and continuously variable transmissions are equipped with an oil pump that discharges high-pressure hydraulic oil. By adjusting and supplying high-pressure hydraulic oil discharged from the oil pump, shifting and forward / reverse driving are performed. Each function such as switching is realized. For example, a trochoid pump is often used as such an oil pump.

  Also, oil pumps are usually fastened and fixed to a transmission case (transmission case) with bolts or the like (see, for example, Patent Document 1). Here, in Patent Document 1, a pump housing of an oil pump is configured by overlapping a pair of end housings on both side surfaces of a center housing that houses a rotor, and one end housing of the pump housing is bolted to a transmission case. An oil pump structure fixed in the above is disclosed.

JP 2012-57675 A

  By the way, in an oil pump, vibration and noise (noise) are generated due to the rotor, gears, and the like rotating at high speed. Here, when the oil pump is fastened and fixed to the transmission case with bolts as described above, vibration generated by the oil pump may be transmitted to the transmission case and radiated as noise through the transmission case. In particular, in the high speed region, the contribution to the noise performance of the vehicle is large, and it has been demanded to reduce the noise caused by driving the oil pump.

  The present invention has been made to solve the above-described problems, and is an oil that can suppress vibration generated in the oil pump from being transmitted to the case of the power unit and reduce noise generated from the case of the power unit. An object of the present invention is to provide a pump mounting structure.

An oil pump mounting structure according to the present invention is an oil pump mounting structure mounted on a power unit case, a bracket to which the oil pump is mounted, an elastic member interposed between the bracket and the power unit case, A hydraulic chamber that is defined between the bracket and the case of the power unit and that is filled with pressurized oil discharged from the oil pump when the oil pump is driven , the hydraulic chamber having elasticity, the bracket And a sealing member interposed between the power unit case and the case of the power unit .

  According to the oil pump mounting structure of the present invention, the oil pump is mounted on the bracket, and the bracket is mounted on the case of the power unit via the elastic member. Further, a hydraulic chamber filled with oil discharged from the oil pump is defined between the bracket and the case of the power unit. For this reason, when the hydraulic chamber is filled with high-pressure oil discharged from the oil pump, the bracket is brought into a floating state in which contact between the metal and the case of the power unit (metal touch) is eliminated. As a result, vibration generated in the oil pump is suppressed from being transmitted to the case of the power unit, and noise (noise) generated from the case of the power unit can be reduced.

  In the oil pump mounting structure according to the present invention, the bracket has a bottomed cylindrical portion, and the bottom and side surfaces of the bottomed cylindrical portion are disposed so as to face the case of the power unit, and the hydraulic chamber is It is preferable to be defined between the bottom surface and the side surface of the bottomed cylindrical portion and the case of the power unit.

  In this case, a hydraulic chamber filled with oil discharged from the oil pump is defined around the bottom and side surfaces of the bracket to which the oil pump is attached. Therefore, the discharge pressure (hydraulic pressure) of the oil pump is applied from the bottom and side surfaces of the bracket, and the entire bracket can be kept in a stable floating state.

  In the oil pump mounting structure according to the present invention, it is preferable that the oil pump is disposed in the bottomed cylindrical portion so that the axial direction of the bottomed cylindrical portion coincides with the axial direction of the oil pump.

  In this way, the discharge pressure (hydraulic pressure) of the oil pump is applied from each of the thrust direction and radial direction of the oil pump and the bracket to which the oil pump is attached. Therefore, the positioning of the oil pump in the thrust direction and the radial direction can be automatically performed. In particular, a positioning effect in the radial direction, that is, an alignment effect can be obtained, so that, for example, a knock pin for positioning can be eliminated.

  In the oil pump mounting structure according to the present invention, the bracket has a flange portion formed at the opening end of the bottomed cylindrical portion so as to extend in a direction perpendicular to the axial direction of the bottomed cylindrical portion, and an elastic member. However, it is preferable to include a rubber member interposed between a bolt and a flange portion for attaching the flange portion to the case of the power unit.

  In this case, since the flange portion of the bracket and the case of the power unit are fastened by a bolt via an elastic rubber member, vibration transmitted from the oil pump attached to the bracket to the power unit case is absorbed by the rubber member. As a result, vibration transmission can be suppressed.

  In the oil pump mounting structure according to the present invention, it is preferable that the hydraulic chamber be elastically sealed with a seal member interposed between the bracket and the case of the power unit.

  In this case, since the sealing member interposed between the bracket and the case of the power unit and sealing the hydraulic chamber in a liquid-tight manner has elasticity, the oil pump attached to the bracket via the sealing member is used. Vibration transmitted to the power unit case can be suppressed. In addition, since the hydraulic chamber is sealed in a liquid-tight manner by a seal member, when the hydraulic chamber is filled with high-pressure oil discharged from an oil pump, the bracket contacts the metal of the power unit case (metal touch). ) Can be made floating.

  As the seal member, an O-ring made of a rubber material can be suitably used.

  In the oil pump mounting structure according to the present invention, it is preferable that the power unit is a multi-stage automatic transmission that automatically changes a gear ratio by hydraulic pressure generated by the oil pump.

  As described above, by applying the oil pump mounting structure according to the present invention to the multistage automatic transmission, it is possible to suppress vibration transmitted from the oil pump to the case (transmission case) of the multistage automatic transmission. It is possible to reduce noise radiated from the transmission case.

  In the oil pump mounting structure according to the present invention, the power unit includes a primary pulley provided on the input shaft, a secondary pulley provided on the output shaft, and a power transmission element stretched over both pulleys. It is a continuously variable transmission that changes the groove width of each pulley by the hydraulic pressure generated by the hydraulic pressure to change the winding diameter of the power transmission element and changes the gear ratio steplessly, and the oil pump is a trochoid pump preferable.

  Thus, by applying the oil pump mounting structure according to the present invention to a continuously variable transmission, vibration transmitted from the oil pump to the case of the continuously variable transmission (transmission case) can be suppressed, Noise radiated from the transmission case can be reduced. As the oil pump, a trochoid pump can be preferably used.

  ADVANTAGE OF THE INVENTION According to this invention, it can suppress that the vibration which generate | occur | produces with an oil pump is transmitted to the case of a power unit, and it becomes possible to reduce the noise (noise) which arises from the case of a power unit.

It is a figure which shows the attachment structure of the oil pump which concerns on embodiment. It is a perspective view which shows the bracket which comprises the attachment structure of the oil pump which concerns on embodiment. It is a block diagram which shows the structure of the continuously variable transmission with which the oil pump which concerns on embodiment was attached.

  DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In addition, in each figure, the same code | symbol is attached | subjected to the same element and the overlapping description is abbreviate | omitted.

  First, the oil pump mounting structure according to the embodiment will be described with reference to FIGS. FIG. 1 is a diagram illustrating a mounting structure of an oil pump 20 according to the embodiment. FIG. 2 is a perspective view showing a bracket 50 that constitutes the mounting structure of the oil pump 20. FIG. 3 is a block diagram illustrating a configuration of the continuously variable transmission 100 to which the oil pump 20 is attached.

  In the present embodiment, a case of a continuously variable transmission (corresponding to a power unit described in claims) 100 (hereinafter referred to as “transmission case”) that automatically and continuously changes the gear ratio in accordance with the driving state of the vehicle. ) The case where the oil pump 20 is attached to 10 will be described as an example.

  The continuously variable transmission (CVT) 100 includes, for example, a drive chain 113 (corresponding to a power transmission element) between a primary pulley 111 that is pivotally supported by the input shaft 101 and a secondary pulley 112 that is pivotally supported by the output shaft 102. Is a chain type continuously variable transmission. In the transmission case 10 of the continuously variable transmission 100, a primary pulley 111 connected to an output shaft (crankshaft) 121 of the engine 120 via a torque converter 130, a reduction gear 132, etc., and a driving belt connected to the primary pulley 111. The secondary pulley 112 connected via the 113, a differential mechanism (not shown) connected to the secondary pulley 112, and the like are mainly stored.

  An oil pump 20 for supplying hydraulic oil and lubricating oil to each mechanism described above is attached to the side surface of the transmission case 10 via a bracket 50. In the present embodiment, a chain-driven trochoid pump is used as the oil pump 20.

  The oil pump 20 includes a housing 21 and a cover 22 that is superimposed on the side surface of the housing 21.

  A circular rotor accommodating portion 21a is formed in the housing 21, and the outer rotor 23 is rotatably fitted in the rotor accommodating portion 21a, and the inner rotor 24 is rotatably fitted in the outer rotor 23. To do. The outer rotor 23 and the inner rotor 24 mesh with each other in an eccentric state, and a plurality of working chambers whose volumes increase and decrease are formed between them.

  Further, the cover 22 is formed with a suction port 26 for sucking oil and a discharge port 27 for discharging oil, communicating with the rotor accommodating chamber 21 a so as to penetrate the cover 22.

  A pump shaft (drive shaft) 25 that drives the oil pump 20 is coupled to the central portion of the inner rotor 24. Here, shaft support holes 21b and 22b are formed at the centers of the housing 21 and the cover 22, and the pump shaft 25 is rotatably supported via a bearing, for example. On the other hand, a driven sprocket is fixed to the base end portion of the pump shaft 25 protruding from the shaft support hole 21 b of the housing 21. The driven sprocket is connected to a drive sprocket provided on the output shaft 131 of the torque converter 130 via an endless chain 135 and is driven to rotate via the endless chain 135.

  The oil pump 20 (housing 21 and cover 22) has a plurality of (for example, four) through holes 20a (note that one of them is shown in FIG. 1). The oil pump 20 is attached to the bracket 50 by the bolts 30 penetrating the oil pump 20 through these through holes 20 a being screwed into the nuts 51 of the bracket 50.

  As shown in FIG. 2, the bracket 50 is formed with a bottomed cylindrical portion 50a and an opening end of the bottomed cylindrical portion 50a so as to extend in a direction perpendicular to the axial direction of the bottomed cylindrical portion 50a. It is a hat-shaped member having a flange portion (ridge portion) 50b. The bracket 50 is preferably obtained by sheet metal processing, for example. However, the bracket 50 may be manufactured by casting, for example. In this case, it is preferable to provide a boss instead of the nut 51 and form a screw hole in the boss.

  The oil pump 20 is housed and attached to the bottomed cylindrical portion 50 a of the bracket 50. At that time, the oil pump 20 is disposed so that the axial direction of the bottomed cylindrical portion 50a coincides with the axial direction of the oil pump 20. That is, the axis of the pump shaft 25 of the oil pump 20 and the axis of the bottomed cylindrical portion 50a coincide.

  The bottomed cylindrical portion 50a has a cylindrical suction port 50c projecting from the bottom surface and a discharge hole 50d. The suction port 50 c communicates with a suction oil passage 10 a formed so as to penetrate the transmission case 10. Further, the discharge hole 50d communicates with a discharge oil passage 10b and a hydraulic chamber 28 formed so as to penetrate the transmission case 10.

  The bottomed cylindrical portion 50a has a nut 51 attached to the bottom side of the bottom by welding or the like. Note that the nut 51 is not necessarily fixed to the bottomed cylindrical portion 50a. Then, as described above, the bolt 30 penetrating the oil pump 20 is screwed into the nut 51, whereby the oil pump 20 is fastened and fixed to the bracket 50.

  A plurality of (for example, four) bolt holes 50e are formed in the flange portion 50b of the bracket 50 at equal intervals. A metal collar (for example, iron) formed in a hollow cylindrical shape is inserted into each bolt hole 50e, and a rubber member (elastic member) 35 is interposed between the collar 34 and the bolt hole 50e. It is disguised. Then, the shaft portion of the bolt 33 is inserted into the collar 34, and the tip of the bolt 33 passes through the bolt hole 50 e and is screwed into the transmission case 10. Thereby, the bracket 50 is attached to the transmission case 10. The collar 34 may be made of a resin (for example, engineering plastic) having excellent strength, oil resistance, temperature resistance, and the like.

  The rubber member 35 is made of a rubber material having elasticity and excellent oil resistance, temperature resistance, and the like. For example, the rubber member 35 is formed in a cylindrical shape having flanges at both ends. Since the rubber member 35 is interposed between the collar 34 and the bolt 33 and the bracket 50 (flange portion 50b), metal contact between the collar 34 and the bolt 33 and the bracket 50 (flange portion 50b) is prevented. Is done.

  The bracket 50 is attached to the transmission case 10 so that the bottom surface and the side surface of the bottomed cylindrical portion 50 a face the transmission case 10. A hydraulic chamber filled with oil discharged from the oil pump 20 when the oil pump 20 is driven is provided between the bottom and side surfaces of the bottomed cylindrical portion 50a of the bracket 50 and the transmission case 10. 28 is defined.

  The hydraulic chamber 28 has elasticity and is sealed (sealed) in a liquid-tight manner by an O-ring 40, an O-ring 41, and an O-ring 43 (seal member) interposed between the bracket 50 and the transmission case 10. Has been. More specifically, the O-ring 40 is attached along the circumferential direction on the outer surface in the vicinity of the flange portion 50b of the bottomed cylindrical portion 50a of the bracket 50 (that is, between the bottomed cylindrical portion 50a and the transmission case 10). ing. The O-ring 40 is liquid-tight so that oil does not leak from between the outer surface of the bottomed cylindrical portion 50 a and the transmission case 10.

  The O-ring 41 is attached along the circumferential direction to the outer surface of the tip of the suction port 50c projecting from the bottom of the bracket 50 (that is, between the suction port 50c and the transmission case 10 (suction oil passage 10a)). It has been. The O-ring 41 is liquid-tight so that oil does not leak from between the outer surface of the suction port 50 c and the transmission case 10.

  The O-ring 43 is attached to the mating surface 15 between the oil pump 20 and the bracket 50 so as to surround the discharge port 27 of the oil pump 20. The O-ring 43 is liquid-tight so that oil does not leak from between the bracket 50 and the oil pump 20 (discharge port 27).

  An O-ring 42 is attached to the mating surface 15 between the oil pump 20 and the bracket 50 so as to surround the suction port 26 of the oil pump 20. The O-ring 42 is liquid-tight so that oil does not leak from between the bracket 50 and the oil pump 20 (suction port 26).

  Each of the O-rings 40, 41, 42, and 43 is an annular member having a circular cross section, and is made of a rubber material having elasticity and excellent oil resistance, temperature resistance, and the like. Yes. As described above, by attaching the O-rings 40, 41, 43, the hydraulic chamber 28 filled with the oil discharged from the oil pump 20 is defined between the bracket 50 and the transmission case 10.

  By having the above-described configuration, that is, the flange portion 50b of the bracket 50 and the transmission case 10 are fastened by the bolt 33 via the elastic rubber member 35, and thus the bracket 50 is attached. The vibration transmitted from the oil pump 20 to the transmission case 10 is absorbed by the rubber member 35, and the vibration transmission is suppressed.

  In addition, since the O-rings 40, 41, 43 that are interposed between the bracket 50 and the transmission case 10 and seal the hydraulic chamber 28 in a liquid-tight manner are made of a rubber material and have elasticity, the O-rings 40, 41 , 43, vibration transmitted from the oil pump 20 attached to the bracket 50 to the transmission case 10 is suppressed.

  On the other hand, since a hydraulic chamber 28 filled with oil discharged from the oil pump 20 is defined between the bracket 50 and the transmission case 10, the hydraulic chamber 28 is formed of high-pressure oil discharged from the oil pump 20. Is satisfied, the bracket 50 is brought into a floating state in which the metal contact with the transmission case 10 (metal touch) is eliminated. Therefore, transmission of vibration generated in the oil pump 20 to the transmission case 10 is cut off, and noise (noise) generated from the transmission case 10 is reduced.

  The oil pump 20 is disposed in the bottomed cylindrical portion 50a so that the axial direction of the bottomed cylindrical portion 50a of the bracket 50 matches the axial direction of the oil pump 20, and the bottomed cylindrical portion 50a. Since the hydraulic chamber 28 is defined between each of the bottom and side surfaces of the transmission and the transmission case 10, the discharge pressure (hydraulic pressure) of the oil pump 20 is applied from the bottom and side surfaces of the bracket 50, and the entire bracket 50 is in a stable floating state. Kept in a state. In particular, since the discharge pressure (hydraulic pressure) of the oil pump 20 is uniformly applied from the radial direction of the oil pump 20 (pump shaft 25), a positioning effect in the radial direction, that is, an alignment effect is obtained.

  As described above in detail, according to the present embodiment, the flange portion 50b of the bracket 50 and the transmission case 10 are fastened by the bolt 33 via the rubber member 35 having elasticity. The vibration transmitted from the oil pump 20 attached to the transmission case 10 to the transmission case 10 is absorbed by the rubber member 35, whereby the vibration transmission can be suppressed.

  In addition, according to the present embodiment, the O-rings 40, 41, and 43 that are interposed between the bracket 50 and the transmission case 10 and seal the hydraulic chamber 28 in a liquid-tight manner have elasticity. Vibration transmitted from the oil pump 20 attached to the bracket 50 to the transmission case 10 via the O-rings 40, 41, 43 can be suppressed.

  Furthermore, according to the present embodiment, the hydraulic chamber 28 filled with the oil discharged from the oil pump 20 is defined between the bracket 50 and the transmission case 10, so that the oil is discharged from the oil pump 20. When the hydraulic chamber is filled with high-pressure oil, the bracket 50 is brought into a floating state in which contact between the metal and the transmission case 10 is eliminated. As a result, transmission of vibration generated in the oil pump 20 to the transmission case 10 is cut off, and noise generated from the transmission case 10 can be reduced.

  Further, according to the present embodiment, the oil pump 20 is disposed in the bottomed cylindrical portion 50a so that the axial direction of the bottomed cylindrical portion 50a of the bracket 50 and the axial direction of the oil pump 20 coincide. At the same time, a hydraulic chamber 28 is defined between the bottom and side surfaces of the bottomed cylindrical portion 50 a and the transmission case 10. Therefore, the discharge pressure (hydraulic pressure) of the oil pump 20 is applied from the bottom surface and the side surface of the bracket 50, and the entire bracket 50 can be kept in a stable floating state.

  In particular, according to this embodiment, since the discharge pressure (hydraulic pressure) of the oil pump 20 is uniformly applied from the radial direction of the oil pump 20 (pump shaft 25), a positioning effect in the radial direction, that is, an alignment effect can be obtained. Thus, for example, a positioning knock pin can be eliminated.

  Although the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications can be made. For example, in the above embodiment, the case where the oil pump mounting structure according to the present invention is applied to a continuously variable transmission (CVT) has been described as an example. However, instead of a continuously variable transmission, for example, a multi-stage automatic transmission (AT) can also be applied. Further, the present invention is not limited to an oil pump for a transmission, and can also be applied to an oil pump such as an engine.

  In the above embodiment, the oil pump 20 is a chain drive trochoid pump. However, the oil pump 20 is not limited to the chain drive trochoid pump. Different types of oil pumps such as vane pumps may be used. Furthermore, the drive system of the oil pump is not limited to the chain drive system described above, and for example, a coaxial system may be used.

DESCRIPTION OF SYMBOLS 10 Transmission case 15 Matching surface 20 Oil pump 20a Through-hole 21 Housing 22 Cover 23 Outer rotor 24 Inner rotor 25 Pump shaft 26 Suction port 27 Discharge port 28 Hydraulic chamber 30, 33 Bolt 34 Collar 35 Rubber member 40, 41, 42, 43 O Ring 50 Bracket 50a Bottomed cylindrical part 50b Flange part 50c Suction port 50d Discharge hole 50e Bolt hole 51 Nut 100 Continuously variable transmission 111 Primary pulley 112 Secondary pulley 113 Drive belt

Claims (7)

An oil pump mounting structure that is attached to the case of the power unit,
A bracket to which the oil pump is attached;
An elastic member interposed between the bracket and the case of the power unit;
A hydraulic chamber defined between the bracket and the case of the power unit and filled with pressurized oil discharged from the oil pump when the oil pump is driven ,
The oil pump mounting structure is characterized in that the hydraulic chamber has elasticity and is liquid-tightly sealed by a seal member interposed between the bracket and the case of the power unit . The bracket has a bottomed cylindrical portion, and is arranged so that a bottom surface and a side surface of the bottomed cylindrical portion face the case of the power unit,
The oil pump mounting structure according to claim 1, wherein the hydraulic chamber is defined between a bottom surface and a side surface of the bottomed cylindrical portion and a case of the power unit.   The oil pump according to claim 2, wherein the oil pump is disposed in the bottomed cylindrical portion so that an axial direction of the bottomed cylindrical portion and an axial direction of the oil pump coincide with each other. Mounting structure. The bracket has a flange portion formed at the opening end of the bottomed cylindrical portion so as to extend in a direction perpendicular to the axial direction of the bottomed cylindrical portion,
4. The oil pump mounting structure according to claim 2, wherein the elastic member includes a rubber member interposed between a bolt that attaches the flange portion to a case of the power unit and the flange portion. 5. . The oil pump mounting structure according to any one of claims 1 to 4, wherein the seal member is an O-ring made of a rubber material. The oil pump installation according to any one of claims 1 to 5 , wherein the power unit is a multi-stage automatic transmission that automatically changes a gear ratio by hydraulic pressure generated by the oil pump. Construction. The power unit has a primary pulley provided on the input shaft, a secondary pulley provided on the output shaft, and a power transmission element stretched over both pulleys. Is a continuously variable transmission that changes the wrapping diameter of the power transmission element to change the gear ratio continuously.
The oil pump mounting structure for an oil pump according to any one of claims 1-5, characterized in that a trochoid pump.

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