JP7209562B2 - Vehicle drive system - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle drive system including a drive shaft, a liquid-cooled rotary electric machine , and a dry clutch.

2. Description of the Related Art A vehicle drive system is known that includes a drive shaft connected to an internal combustion engine, a liquid-cooled rotating electrical machine, and a wet clutch capable of drivingly connecting the drive shaft and a rotor of the rotating electrical machine. (Patent document 1)
In the vehicle drive system having such a configuration, if the clutch is changed to a dry type while the rotating electric machine is liquid-cooled, the space in which the rotating electric machine is arranged and the space in which the dry clutch is arranged will be separated. It becomes necessary to provide an oil seal.

JP 2015-140044 A

For example, in the vehicle drive system configured as described above, the clutch (clutch plate) is normally arranged on the internal combustion engine side, so the oil seal is also arranged on the internal combustion engine side. On the other hand, since the coolant for the rotary electric machine is supplied from the transmission side, the coolant may not be sufficiently supplied to the oil seal, and as a result, the oil seal may overheat.

SUMMARY OF THE INVENTION The present invention has been devised in view of the above-described problems, and is for a vehicle capable of cooling an oil seal that separates the arrangement space of a liquid-cooled rotary electric machine and the arrangement space of a dry clutch with a simple configuration. The object is to provide a drive.

(1) In order to achieve the above object, the vehicle drive system of the present invention comprises a drive shaft, a liquid-cooled rotating electric machine disposed on the outer peripheral side of the drive shaft, and a drive shaft in the radial direction. a dry clutch disposed between the shaft and the rotating electrical machine and capable of drivingly connecting the drive shaft and the rotor of the rotating electrical machine, the rotor being supported by the outer peripheral surface of a cylindrical support member; It is positioned in contact with an annular stop projecting radially outward from one side of the support member , power is output from the support member, and the cooling liquid of the rotating electrical machine is supplied from the other side of the support member. In the vehicular drive device having a configuration in which the power supply is supplied, the installation space of the rotating electric machine and the installation space of the dry clutch are separated from the installation space of the dry clutch by liquid-tight sliding contact with the outer peripheral surface of the support member on the one side of the stop portion. and an oil passage is formed in the support member for supplying the cooling liquid from the other side to an opening formed in the outer peripheral surface of the stop portion, and an end face on the one side of the rotor is connected to the opening. It is characterized in that annular first wall portions are provided so as to protrude in the axial direction so as to face each other.

(2) It is preferable that an annular second wall portion corresponding to the first wall portion is formed on the cover member that covers the one side of the rotating electric machine and the dry clutch so as to protrude toward the rotor in the axial direction.
(3) It is preferable that the front end surface of the first wall portion and the front end surface of the second wall portion are opposed to each other.

(4) Further, it is preferable that the first wall portion and the second wall portion overlap with each other with a gap in the radial direction.
(5) A first stepped portion is formed at the tip of the first wall portion, a second stepped portion is formed at the tip of the second wall portion, and the two stepped portions overlap each other with a gap therebetween. preferably configured.
(6) Furthermore, it is preferable to fix the base of the oil seal to the inner peripheral surface of the second wall.

According to the present invention, an oil seal is provided in sliding contact with the outer peripheral surface of the support member on one side of the support member, and the oil passage for supplying the cooling liquid supplied from the other side of the support member to the one side of the rotating electric machine is provided in the rotor. Since it is formed on the support member, the sliding contact portion of the oil seal and the cooling liquid supply portion (oil passage) can be brought close to each other, and the sliding contact portion of the support member, which is in sliding contact with the oil seal, can be efficiently cooled. can.
In addition, since the first wall portion is provided so as to face the opening formed on the outer peripheral surface of the stop portion for the coolant to flow out, the direction of flow of the coolant flowing out of the opening is changed by the first wall portion. As a result, the coolant can flow toward the oil seal, and the amount of coolant supplied to the oil seal can be increased.

In addition, according to the present invention, the cover member is provided with a protruding second wall portion corresponding to the first wall portion. By forming a stepped portion at the tip of both wall portions so that both stepped portions are overlapped with each other with a gap, the area of the flow path formed between both wall portions is reduced. By reducing or increasing the flow path resistance, it is possible to reduce the outflow of coolant from the inside to the outside of both wall portions in the radial direction, and increase the amount of coolant supplied to the periphery of the oil seal. It is possible to improve the cooling efficiency of the sliding contact portion of the support member that is in sliding contact with.

Furthermore, since the base portion of the oil seal is fixed to the inner peripheral surface of the second wall portion, there is no need to separately form a structure for fixing the oil seal, and complication of the structure can be prevented.
In other words, since a structure for fixing the oil seal is originally required, the fixing structure can also be used as the second wall portion.

1 is a schematic diagram showing a schematic configuration of a vehicle drive system to which an embodiment of the invention is applied; FIG. 2 is a partial cross-sectional view of the vehicle drive device; FIG. It is a fragmentary sectional view showing a modification of the above-mentioned embodiment. FIG. 11 is a partial cross-sectional view showing another modification of the embodiment;

Embodiments of the present invention will be described below with reference to the drawings.
It should be noted that the embodiments shown below are merely examples, and there is no intention to exclude various modifications and application of techniques that are not explicitly described in the following embodiments.

A vehicle drive system 10 according to the present embodiment includes an internal combustion engine E, a liquid-cooled rotating electrical machine M, and a transmission T. The rotating electrical machine M includes a rotor Mr and a stator Ms. A drive shaft 12 connected to the internal combustion engine E is drive-connected via a dry clutch C to a support member 14 supporting the rotor Mr of the rotary electric machine M in a detachable manner. 16. An output shaft 18 of the transmission T is connected to a driving wheel 20. Between the input shaft 16 and the output shaft 18, a belt type continuously variable transmission mechanism, a planetary gear type stepped transmission mechanism, or the like (not shown) is provided. A known transmission mechanism is provided. In the case of a belt-type continuously variable transmission mechanism, the connection state with the rotary electric machine M is controlled by controlling the engagement/disengagement of the forward/reverse clutch. The connection state with the rotary electric machine M is controlled by the control of .

As shown in FIG. 2, the rotating electric machine M is disposed on the outer peripheral side (outside in the radial direction) of the drive shaft 12, and the dry clutch C is between the drive shaft 12 and the rotating electric machine M in the radial direction. are arranged. In FIG. 2, arrow E indicates the internal combustion engine E side, and arrow T indicates the transmission T side.
Although the structure of the dry clutch 12 is well known and not shown in detail, a plurality of clutch plates 22 arranged on the side of the internal combustion engine E and a clutch plate 22 arranged on the side of the transmission T can press the clutch plates. A hydraulically operated piston 24 is provided. A plurality of push rods (not shown) are provided on the piston 24 at intervals in the circumferential direction. It is configured to penetrate and press the clutch plate while maintaining tightness.

The support member 14 is formed in a cylindrical shape and supports the rotor Mr on its outer peripheral surface. The axial position of the rotor Mr is determined by abutting the end plate 30 of the rotor Mr on the internal combustion engine E side against the end face 28 of the transmission T side of the rotor Mr.
A flange-shaped radial connecting portion 32 for connecting the support member 14 to the input shaft 16 is integrally formed on the inner peripheral side of the support member 14 .

In the liquid-cooled rotary electric machine M, a supply port 34 provided on the input shaft 16 connects the piston 24, the radial connecting portion 32, and the inner peripheral surface of the support member 14 as indicated by the dashed-dotted arrow A. Coolant (working oil of the transmission T) is supplied from the side of the transmission T through the gap.

In the above configuration, a space 36 for arranging the dry clutch C (clutch plate 22) and the rotary electric machine M are arranged in liquid-tight sliding contact with the outer peripheral surface of the support member 14 on the side of the internal combustion engine E from the stop portion 26 of the support member 14. An oil seal 40 that separates the arrangement space 38 is provided.
Further, an oil passage 44 is formed along the axial direction on the outer peripheral surface of the support member 14 in order to supply part of the cooling liquid to an opening 42 formed on the outer peripheral surface of the stop portion 26. A communication hole 46 is formed in the oil passage 44 to take in the coolant flowing between the piston 24 and the inner peripheral surface of the support member 14 .

Further, the end plate 30 is formed with an annular first wall portion 48 projecting in the axial direction so that the inner peripheral surface of the end plate 30 faces the opening 42, and the rotary electric machine M and the dry clutch C are connected to the internal combustion engine E side. An annular second wall portion 52 corresponding to the first wall portion 48 is formed on the inner surface side of the covering member 50 so as to protrude axially toward the rotor Mr side. The leading end face 54 of the first wall portion 48 and the leading end face 56 of the second wall portion 52 face each other, thereby narrowing the width of the gap 58 formed between the leading end faces 54 and 56 to reduce the flow area. is reduced, and the flow rate of cooling liquid from the inner peripheral side to the outer peripheral side of both wall portions 48 and 52 is reduced.
A base portion 40 b of the oil seal 40 is fixed to the inner peripheral surface of the second wall portion 52 .

With the above configuration, according to the present vehicle drive system, the coolant for the rotary electric machine M supplied to the transmission T side is supplied to the internal combustion engine E side via the communication hole 46 and the oil passage 44. Since the vicinity of the stop portion 26 of the support member 14 is cooled, the sliding contact portion of the support member that is in sliding contact with the oil seal 40 is also cooled accordingly.
In addition, the flow direction of the coolant flowing out of the opening 42 is changed to the direction of the oil seal 40 by the inner peripheral surface of the first wall portion 48, and the flow area of the gap 58 is reduced to Since the outflow of cooling liquid to the outside is reduced, the amount of cooling liquid supplied to the oil seal 40 can be increased, and the sliding contact portion of the support member that is in sliding contact with the oil seal 40 can be efficiently cooled. can.
Furthermore, since the second wall portion 52 is also used as a fixing structure for the oil seal 40, complication of the structure can be prevented.

3 and 4 show another configuration (modification) of the corresponding first wall portion 48 and second wall portion 52. The modification shown in FIG. Extending to the outer peripheral side of the wall portion 52 so that both wall portions 48 and 52 overlap in the radial direction, a gap 58 is formed between the inner peripheral surface of the first wall portion 48 and the outer peripheral surface of the second wall portion 52. there is
According to this configuration, the flow direction of the coolant flowing out to the outside of the walls 48 and 52 is changed from the radial direction to the axial direction, so that the flow resistance increases and the outflow of the coolant is further reduced. can.

In the configuration of FIG. 4, a first stepped portion 48s is formed at the tip of the first wall portion 48, a second stepped portion 52s is formed at the tip of the second wall portion 52, and both stepped portions 48s, 52s are Since they overlap with each other with a gap 58', the gap 58' has a so-called labyrinth shape, which further increases the flow resistance and further reduces the outflow of the cooling liquid.

Although the embodiments of the present invention have been described above, it is needless to say that the present invention can be implemented by appropriately modifying such embodiments.

REFERENCE SIGNS LIST 10 VEHICLE DRIVE SYSTEM 12 DRIVE SHAFT 14 SUPPORT MEMBER 16 INPUT SHAFT 26 STOP 30 END PLATE 32 RADIAL CONNECTION 36 ARRANGEMENT SPACE FOR DRY CLUTCH C 38 ARRANGEMENT SPACE FOR ROTATING ELECTRICAL MACHINE M 40 OIL SEAL 42 OPENING 44 OIL PATH 48 FIRST Wall portion 52 Second wall portion 58, 58' Gap

Claims (6)

a drive shaft;
a liquid-cooled rotary electric machine disposed on the outer peripheral side of the drive shaft;
a dry clutch disposed between the drive shaft and the rotating electrical machine in the radial direction and capable of drivingly connecting the drive shaft and the rotor of the rotating electrical machine;
The rotor is supported by the outer peripheral surface of a cylindrical support member and is positioned in contact with an annular stopper formed on one side of the support member and protruding radially outward,
Power is output from the support member,
In a vehicle drive device having a configuration in which cooling liquid for the rotating electric machine is supplied from the other side of the support member ,
An oil seal is provided in liquid-tight sliding contact with the outer peripheral surface of the support member on the one side of the stop portion to separate the installation space of the rotating electric machine from the installation space of the dry clutch,
forming an oil passage for supplying the cooling liquid from the other side of the support member to an opening formed in the outer peripheral surface of the stop portion;
A vehicle driving device according to claim 1, wherein an annular first wall portion is provided on the one end surface of the rotor so as to protrude in the axial direction so as to face the opening. 2. A cover member covering said one side of said rotating electric machine and said dry clutch has an annular second wall portion corresponding to said first wall portion projecting toward said rotor in the axial direction. The vehicle driving device according to . 3. The vehicle driving device according to claim 2, wherein the front end surface of the first wall portion and the front end surface of the second wall portion are configured to face each other. 3. The vehicle driving device according to claim 2, wherein the first wall portion and the second wall portion overlap each other with a gap in the radial direction. A first stepped portion is formed at the tip of the first wall portion, a second stepped portion is formed at the tip of the second wall portion, and both stepped portions overlap each other with a gap therebetween. The vehicle drive system according to claim 2, characterized by: 3. The vehicle driving device according to claim 2, wherein the base portion of the oil seal is fixed to the inner peripheral surface of the second wall portion.

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