JP2020143689A - Motor driving device for vehicle - Google Patents

Abstract

To easily and surely fix an oil supply nozzle member for supplying a lubricant to an input gear shaft, to a housing in a motor driving device for a vehicle in which a motor rotating shaft and the input gear shaft are connected by spline-fitting.SOLUTION: In a motor driving device for a vehicle in which a motor rotating shaft 25 of an electric motor portion and an input gear shaft 30 of a speed reducer portion are coaxially connected by spline-fitting, an oil supply nozzle member 85 for supplying a lubricant into the input gear shaft 30 is disposed at an outboard side of the input gear shaft 30, the oil supply nozzle member 85 has a nozzle portion 85a inserted to the input gear shaft 30, a main body portion, and an elastic supporting portion 85g disposed on an outer periphery of the main body portion in a manner of projecting to a radial outer side, and the oil supply nozzle member 85 is inserted to an oil supply nozzle member mounting hole 72d formed on a speed reducer housing 22, and fixed to the oil supply nozzle member mounting hole 72d by the elastic supporting portion 85g to supply the lubricant from an oil reservoir portion 22d to the oil supply nozzle member 85.SELECTED DRAWING: Figure 3

Description

The present invention relates to a vehicle motor drive, specifically a lubricating oil supply structure in a vehicle motor drive.

There is an in-wheel motor drive device in which an electric motor housed inside a wheel is used as a drive source and the rotation of the electric motor is reduced by a speed reducer to drive the drive wheels.

As a reducer of the in-wheel motor drive device, an input gear shaft that rotates by the output torque of the electric motor, an output gear shaft that outputs to the drive wheels, and an intermediate gear shaft provided between the input gear shaft and the output gear shaft. There is a gear drive reducer equipped with the above, and the output torque of the electric motor is sequentially reduced to output a large output torque from the output gear shaft.

Lubricating oil is used in the gear drive reducer for lubrication and cooling. As a method of supplying lubricating oil, there are a splash method using the rotational force of a deceleration element (gear or pulley) and a pump method of forced circulation using a pump.

Patent Document 1 discloses an in-wheel motor drive device that supplies lubricating oil by using a pump method. The in-wheel motor drive device described in Patent Document 1 will be described with reference to FIG.

The in-wheel motor drive device 100 has an electric motor unit A that generates a driving force, a speed reducer unit B that decelerates and outputs the rotation of the electric motor unit A, and a rear wheel that uses the output from the speed reducer unit B as drive wheels. It is provided with a wheel bearing portion C that transmits to the wheel.

The electric motor unit A and the speed reducer unit B are housed in the housing 190. The housing 190 is composed of a motor housing 191 and a speed reducer housing 192.

The electric motor unit A is integrated with the stator 123 fixed to the housing 191 and the rotor 124 arranged so as to face each other with a gap inside the stator 123 in the radial direction and the rotor 124 arranged inside the rotor 124 in the radial direction. It includes a rotating motor rotating shaft 125.

The speed reducer unit B includes an input gear shaft 132 having an input gear 132a to which power is transmitted from the motor rotating shaft 125, and a first large-diameter gear 133a and a second large-diameter gear 134a that mesh with the input gear 132a. A first intermediate gear shaft 133 having a small diameter gear 133b, a second intermediate gear shaft 134 having the second large diameter gear 134a and a second small diameter gear 134b meshing with the output gear 135a, and an output gear shaft 135 having an output gear 135a. It is a parallel shaft gear reducer equipped with.

The input gear shaft 132 has a tubular body portion having a diameter larger than that of the tip portion 125e of the motor rotating shaft 125, and the tip portion 125e is spline-fitted with the input gear shaft 132 (fitting by spline processing and serration processing). Including fitting. The same applies hereinafter), and they are coaxially connected.

The structure for supplying the lubricating oil of the in-wheel motor drive device 100 described above is provided in the lower part of the speed reducer unit B, and includes an oil tank 147 for storing the lubricating oil, an oil pump 154 for pumping the lubricating oil from the oil tank 147, and the like. It includes a suction oil passage (not shown) and a discharge oil passage 164 extending in the vertical direction, and an oil pipe 170 extending in the axle direction.

The oil pipe 170 is provided between the inflow port 176 into which the lubricating oil pumped by the oil pump 154 flows in, and the outflow port which is provided between one end to the other end and discharges the lubricating oil flowing in from the inflow port 176 downward. It has 177 and.

According to this lubricating oil supply structure, a lubricating oil outlet 177 is formed between one end and the other end of the oil pipe 170 attached and fixed to the upper parts of the electric motor portion A and the speed reducer portion B to lubricate or lubricate. By providing the outflow port 177 at a position facing the portion requiring cooling, the lubricating oil can be accurately supplied to the required portion.

In the in-wheel motor drive device 100 described above, the lubricating oil pumped by the oil pump 154 is supplied to the gear tooth surface and the inside of the bearing. However, the supply of lubricating oil between the motor rotating shaft 125 and the input gear shaft 132 of the speed reducer unit B coupled with the motor rotating shaft 125 is not considered.

As described above, when the motor rotating shaft 125 and the input gear shaft 132 are coupled by spline fitting, there is a problem that the oil film of the coupling portion is likely to be cut off.

Therefore, the present inventors are coupled by spline fitting in a vehicle motor drive device in which the motor rotation shaft of the electric motor unit and the input gear shaft of the speed reducer unit are coaxially connected by spline fitting. The structure for supplying the lubricating oil to the joint part was examined.

Patent Document 2 discloses a structure in which a hollow hole is formed in the rotating shaft and lubricating oil is supplied into the hollow hole of the rotating shaft. According to Patent Document 2, in a lubricating structure for supplying lubricating oil to a bearing supporting a rotating shaft in a transmission, a hollow hole is formed in the rotating shaft, and an oil sleeve (oil) communicating with a hydraulic circuit is provided at one end of the hollow hole. A supply nozzle member) is provided to supply lubricating oil into the hollow hole. In the structure described in Patent Document 2, an oil sleeve is press-fitted and attached to the housing.

As described in Patent Document 2, the present inventors have configured the input gear shaft with a hollow shaft, provided an oil supply nozzle member at the end of the input gear shaft, and lubricated oil in the hollow shaft from the oil supply nozzle member. Was supplied, and a configuration was examined in which lubricating oil was supplied to the joints connected by spline fitting. When the oil supply nozzle member is provided at the end of the hollow shaft, it is conceivable to press-fit the oil supply nozzle member into the housing to fix it.

In order to press-fit and fix the oil supply nozzle member to the housing, it is necessary to strictly control the dimensional accuracy of the mounting hole for the oil supply nozzle member provided in the housing and the outer shape of the oil supply nozzle member.

Further, if the outer shape of the oil supply nozzle member is made smaller than the mounting hole for the oil supply nozzle member and the oil supply nozzle member is inserted into the mounting hole for the oil supply nozzle member, there is a margin in dimensional accuracy. However, there is a problem that the oil supply nozzle member may fall off from the mounting hole during assembly, resulting in poor assembly workability.

Further, if there is a gap between the oil supply nozzle member and the mounting hole for the oil supply nozzle member, noise is generated during the operation of the vehicle motor drive device. In addition, the vibration of the oil supply nozzle member causes deterioration of the service life. The method of fixing the oil supply nozzle member with an adhesive has problems of adverse effects on the lubricating oil characteristics, life, reliability, and deterioration of work efficiency, and cannot be adopted. For this reason, there arises a problem that the number of parts increases, such as the need to prepare another part that is mechanically and securely fixed.

JP-A-2018-14867 Japanese Unexamined Patent Publication No. 11-51161

The present invention has been made in order to solve the above-mentioned conventional problems, and in a vehicle motor drive device in which a motor rotating shaft and an input gear shaft are coupled by spline fitting, the inside of the input gear shaft It is an object of the present invention to easily and surely fix the oil supply nozzle member that supplies the lubricating oil to the housing.

The present invention includes an electric motor unit that generates a driving force and a speed reducer unit that decelerates and outputs the rotation of the electric motor unit. The speed reducer unit is housed in a speed reducer housing and has an input gear. A gear shaft, an intermediate gear shaft having a large-diameter gear on the input side and a small-diameter gear on the output side, and an output gear shaft having an output gear are provided, and the input gear shaft includes a motor rotation shaft and a spline of the electric motor unit. A vehicle motor drive device coaxially connected by fitting, wherein the input gear shaft is composed of a hollow shaft, and lubricated on the outboard side of the input gear shaft and in the hollow shaft of the input gear shaft. An oil supply nozzle member for supplying oil is arranged, and the oil supply nozzle member includes a nozzle portion inserted into the hollow shaft, a disk-shaped main body portion, and an elastic support portion protruding outward in the radial direction on the outer periphery of the main body portion. The oil supply nozzle member is inserted into the mounting hole for the oil supply nozzle member provided in the speed reducer housing, fixed to the mounting hole for the oil supply nozzle member by the elastic support portion, and decelerated. An oil reservoir for supplying lubricating oil to the oil supply nozzle member is formed between the inner wall of the machine housing and the oil supply nozzle member fixed to the speed reducer housing.

In the present invention, the lubricating oil is fed from the oil supply nozzle member into the input gear shaft formed of the hollow shaft. Then, the lubricating oil is stably supplied to the spline fitting portion between the input gear shaft and the motor rotation shaft. As a result, poor lubrication at the joint can be prevented. Further, since the mounting hole for the oil supply nozzle member and the oil supply nozzle member can be fixed by the elastic support portion, there is a margin in the dimensional accuracy of each, and the mounting work is easy.

Further, the speed reducer housing is divided into a motor side housing and an outboard side housing, and the oil supply nozzle member mounting hole is provided in the outboard side housing.

Further, in the present invention, one end of the input gear shaft is a gear shaft mounting hole formed in the inner wall of the motor side housing, and the other end is a gear shaft mounting hole provided in the inner wall of the outboard side housing. , Each of which is rotatably supported via a rolling bearing, and a mounting hole for the oil supply nozzle member is provided coaxially on the outboard side of the gear shaft mounting hole.

The oil supply nozzle member is provided with an edge portion on the outer periphery of the main body portion, and an elastic support portion can be formed on the edge portion.

Further, the elastic support portion can be formed of an elastic support piece formed by cutting up the edge portion radially outward.

Further, the elastic support portion can be formed by a semicircular protrusion formed on the edge portion and projecting outward in the radial direction.

According to the present invention, the oil supply nozzle member can be easily and fixed to the mounting hole for the oil supply nozzle member by the elastic support portion provided on the oil supply nozzle member. Then, through this oil supply nozzle member, lubricating oil is supplied to the joint portion where the motor rotation shaft and the input gear shaft of the reduction gear portion are coupled by spline fitting, and the oil film breakage of the joint portion occurs. Can be prevented.

It is a vertical cross-sectional view which shows typically the basic structure of the in-wheel motor drive device which concerns on 1st Embodiment of this invention, and the supply structure of lubricating oil. It is sectional drawing which shows typically the internal structure of the reduction gear part of the in-wheel motor drive device which concerns on 1st Embodiment of this invention, and the supply structure of lubricating oil. It is a schematic diagram which enlarged and shows the part where the oil supply nozzle member which concerns on 1st Embodiment of this invention is fixed to a mounting hole. It is a perspective view which shows the oil supply nozzle member which concerns on 1st Embodiment of this invention. It is a front view which shows the oil supply nozzle member which concerns on 1st Embodiment of this invention. It is an enlarged reference view of the elastic support piece portion of the oil supply nozzle member which concerns on 1st Embodiment of this invention. It is a vertical cross-sectional view which shows typically the state of assembling the in-wheel motor drive device which concerns on 1st Embodiment of this invention. It is a perspective view which shows the oil supply nozzle member which concerns on 2nd Embodiment of this invention. It is a front view which shows the oil supply nozzle member which concerns on 2nd Embodiment of this invention. It is an enlarged reference view of the protrusion part of the oil supply nozzle member which concerns on 2nd Embodiment of this invention. It is a schematic diagram which enlarges and shows the part which fixed the oil supply nozzle member which concerns on 2nd Embodiment of this invention to a mounting hole. It is a vertical cross-sectional view which shows typically the basic structure of the conventional in-wheel motor drive device, and the supply structure of lubricating oil.

Embodiments of the present invention will be described in detail with reference to the drawings. The same or corresponding parts in the drawings are designated by the same reference numerals, and the description thereof will not be repeated.

First, a basic configuration example of the in-wheel motor drive device 10 as a vehicle motor drive device according to the first embodiment of the present invention will be described with reference to FIGS. 1 and 2.

The in-wheel motor drive device 10 is mounted on a passenger vehicle such as an electric vehicle and a hybrid vehicle. In the following description, when the in-wheel motor drive device 10 is mounted on the vehicle, the side closer to the outside of the vehicle is referred to as the outboard side, and the side closer to the center is referred to as the inboard side.

FIG. 1 is a vertical cross-sectional view of an in-wheel motor drive device 10 according to an embodiment of the present invention cut along a plane including the DOE line shown in FIG. 2 and viewed by an arrow I. FIG. 2 is a cross-sectional view showing the internal structure of the speed reducer portion B of the in-wheel motor drive device 10, and schematically shows a state seen from the outboard side.

As shown in FIG. 1, the in-wheel motor drive device 10 includes an electric motor unit A for driving a wheel wheel (virtual line W in FIG. 2), a wheel bearing portion C connected to the wheel wheel, and an electric motor unit A. A speed reducer portion B that decelerates rotation and transmits the rotation to the wheel bearing portion C is provided, and is arranged in a wheel house (not shown) formed on the outer side of the vehicle (passenger vehicle) in the vehicle width direction.

The electric motor portion A, the reduction gear portion B, and the wheel bearing portion C are each housed in the housing 20. In this embodiment, the housing 20 has a divisible structure. The housing 20 is preferably made of a light metal such as aluminum or an aluminum alloy. In this embodiment, the housing 20 includes a motor housing 21 and a speed reducer housing 22.

The electric motor unit A includes a stator 23 fixed to the motor housing 21, a rotor 24 arranged so as to face the stator 23 radially inside with a gap, and a rotor 24 arranged radially inside the rotor 24. It is composed of a radial gap type electric motor 26 provided with a motor rotating shaft 25 that rotates integrally. The motor rotation shaft 25 can rotate at high speed at about 10,000 to several thousand rotations per minute. The stator 23 is configured by winding a coil 23a around a magnetic core, and the rotor 24 is composed of a permanent magnet or the like. The electric motor 26 can also be applied to the axial gap type.

The motor rotating shaft 25 has a rolling bearing 40 at one end in the axial direction (left side in FIG. 1) and a rolling bearing 41 at the other end in the axial direction (right side in FIG. 1) with respect to the motor housing 21. Each is rotatably supported.

The motor housing 21 has a cylindrical shape, and the motor housing cover 21v is connected to the inboard side end of the motor housing 21.

The speed reducer unit B includes an input gear shaft 30 having an input gear 30a, an intermediate gear shaft 31 having a large diameter gear 31a on the input side and a small diameter gear 31b on the output side as intermediate gears, and an output gear shaft having an output gear 36a. It includes 36.

The input gear shaft 30 integrally has an input gear 30a. The input gear shaft 30 is composed of a hollow shaft, and the input gear shaft 30 is coaxially coupled to the motor rotating shaft 25 by spline fitting. The intermediate gear shaft 31 is integrally formed with the large-diameter gear 31a and the small-diameter gear 31b. The output gear 36a and the output gear shaft 36 are integrally formed.

The input gear shaft 30, the intermediate gear shaft 31, and the output gear shaft 36 are arranged in parallel with each other. The input gear shaft 30 is provided by rolling bearings 42 and 43, the intermediate gear shaft 31 is provided by rolling bearings 44 and 45, and the output gear shaft 36 is provided by rolling bearings 48 and 49, respectively, at both ends of which are rotatable with respect to the speed reducer housing 22. Is supported by. In this embodiment, the speed reducer housing 22 is divided into a motor side housing 22a and an outboard side housing 22b.

Specifically, the end of the input gear shaft 30 on the inboard side is rotatably supported by a gear shaft mounting hole 71a machined in the inner wall of the motor side housing 22a via a rolling bearing 42, and is supported on the outboard side. Is rotatably supported by a gear shaft mounting hole 71b machined in the outboard side housing 22b via a rolling bearing 43. The gear shaft mounting hole 71b is formed by processing a boss 71c provided on the inner wall of the reduction gear housing on the outboard side of the reduction gear housing 22.

Further, the end of the intermediate gear shaft 31 on the inboard side is rotatably supported by a gear shaft mounting hole 72a machined in the inner wall of the motor side housing 22a via a rolling bearing 44, and the end on the outboard side. Is rotatably supported by a gear shaft mounting hole 72b machined in the inner wall of the outboard side housing 22b via a rolling bearing 45.

Further, the end of the output gear shaft 36 on the inboard side is rotatably supported by a gear shaft mounting hole 73a formed in the inner wall of the motor side housing 22a via a rolling bearing 48, and the end on the outboard side. Is rotatably supported by a gear shaft mounting hole 73b machined in the inner wall of the outboard side housing 22b via a rolling bearing 49.

As shown in FIGS. 1 and 2, in the speed reducer unit B, the input gear 30a and the large-diameter gear 31a are meshed, and the small-diameter gear 31b and the output gear 36a are meshed. The number of teeth of the large-diameter gear 31a is larger than the number of teeth of the input gear 30a and the small-diameter gear 31b, and the number of teeth of the output gear 36a is larger than the number of teeth of the small-diameter gear 31b. From the above configuration, a parallel shaft gear reducer that reduces the rotational movement of the motor rotating shaft 25 in two stages is configured. The reduction mechanism composed of two-stage parallel shaft gears has a relatively small number of parts, and can achieve both a high reduction ratio and miniaturization.

In this embodiment, helical gears are used as the input gear 30a, the large-diameter gear 31a, the small-diameter gear 31b, and the output gear 36a constituting the speed reducer unit B. Helical gears are effective in that the number of teeth that mesh with each other increases at the same time and the tooth contact is dispersed, so that the sound is quiet and the torque fluctuation is small. It is preferable to set the module of each gear to about 1 to 3 in consideration of the meshing ratio of the gears and the limit rotation speed.

As shown in FIG. 1, the wheel bearing portion C is composed of an inner ring rotation type wheel bearing 50. The wheel bearing 50 is a double-row angular contact ball bearing mainly composed of an inner member 61 including a hub ring 60 and an inner ring 52, an outer ring 53, a ball 56, and a cage (not shown).

A wheel mounting flange 60a is formed on the outer periphery of the hub ring 60 on the outboard side, and the inner ring 52 is fitted and crimped and fixed to the small diameter step portion on the inboard side. After assembling the wheel bearing 50, the crimping portion 60b fixes the inner ring 52 and applies a preload to the wheel bearing 50. An inner raceway surface 54a on the outboard side is formed on the outer circumference of the hub ring 60, and an inner raceway surface 54b on the inboard side is formed on the outer circumference of the inner ring 52. Although not shown, a brake disc and a wheel are attached to the wheel mounting flange 60a. The output gear shaft 36 is spline-fitted to the hub wheel 60 and is connected so as to be able to transmit torque.

A flange portion 53a is formed on the outer periphery of the outer ring 53, the flange portion 53a is fastened and fixed to the wheel bearing support member 51 by a bolt 53b, and the flange portion 51a formed on the outer periphery of the wheel bearing support member 51 is a bolt 51b. Is fastened and fixed to the speed reducer casing 22. In this way, the wheel bearing 50 and the speed reducer casing 22 are coupled. The inside of the wheel bearing 50 is lubricated with grease.

The motor rotation shaft 25 of the electric motor 26 and the axis M serving as the rotation center of the rotor 24 extend parallel to the axis P of the wheel bearing portion C. Then, the electric motor portion A is offset so as to be separated from the axis P of the wheel bearing portion C.

A part (upper part) of the inner wall portion of the motor side housing 22a includes the internal space 210 of the electric motor portion A (hereinafter referred to as "motor chamber") 210 and the internal space 220 of the speed reducer portion B (hereinafter referred to as "reduction chamber"). Functions as a partition partition.

As shown in FIG. 2, in the in-wheel motor drive device 10 of this embodiment, the output gear 36a at the lowermost stage of the speed reducer unit B is immersed in the lubricating oil, and the lubricating oil is scooped up by the rotation of the gear. It is supplied to each gear of the speed reducer unit B.

Next, the position of each axis of the speed reducer unit B in the vehicle front-rear direction will be described. As shown in FIG. 2, the axis M of the input gear shaft 30 having the input gear 30a is arranged in front of the axis P of the output gear shaft 36 having the output gear 36a. Further, the axis N of the intermediate gear shaft 31 having the large diameter gear 31a and the small diameter gear 31b is arranged behind the axis M of the input gear shaft 30 and in front of the axis P of the output gear shaft 36 having the output gear 36a. Will be done.

Explaining the vertical position of each axis, the axis M of the input gear shaft 30 is arranged below the axis P of the output gear shaft 36. The axis N of the intermediate gear shaft 31 is arranged above the axis M of the input gear shaft 30.

As shown in FIG. 2, the speed reducer housing 22 has a lower portion 22f of the output gear 36a and a portion protruding downward at a position separated from the axis P of the output gear 36a in the vehicle front direction. This protruding portion forms an oil tank 81 and is located below the lower portion 22f.

Next, the lubricating oil supply structure in the in-wheel motor drive device 10 will be described with reference to FIGS. 1 to 6. FIG. 3 is an enlarged vertical sectional view schematically showing an enlarged supply portion of the lubricating oil of the in-wheel motor drive device according to the first embodiment of the present invention, and FIG. 4 is an oil according to the first embodiment of the present invention. A perspective view showing the supply nozzle member, FIG. 5 is a front view showing the oil supply nozzle member according to the first embodiment of the present invention, and FIG. 6 is an elastic support of the oil supply nozzle member according to the first embodiment of the present invention. It is an enlarged reference figure which shows one part. In addition, in FIGS. 1 to 3, the arrow line schematically shows the flow of lubricating oil.

As shown in FIGS. 1 and 3, in this embodiment, the outboard side housing is located at a position facing the outboard side end portion of the input gear shaft 30 in order to supply lubricating oil into the input gear shaft 30. A gap is provided between the inner wall of 22b and the boss portion 71c in which the mounting hole 71d for the oil supply nozzle member is formed, and the oil reservoir portion 22d is formed in this gap portion. Lubricating oil pumped up from the output gear 36a is supplied to the oil reservoir 22d by the oil passage 22e.

As shown in FIG. 2, the oil reservoir 22d is provided with a lubricating oil guide 93 for guiding the lubricating oil scooped up from the output gear 36a to the oil reservoir 22d. The lubricating oil guide 93 extends upward from above the output gear 36a along the shape of the speed reducer housing 22, and extends downward from the middle of the large-diameter gear 31a of the intermediate gear shaft to the vicinity of the oil passage 22e. A second lubricating oil guide 94 is provided which receives the lubricating oil flowing from the lubricating oil guide 93 below and guides the lubricating oil to the oil reservoir 22d.

As shown in FIGS. 1 and 3, in the boss portion 71c of the outboard side housing 22b, an oil supply nozzle member mounting hole 71d having a diameter smaller than that of the gear shaft mounting hole 71b is coaxially connected to the gear shaft mounting hole 71b. It is provided. A disk-shaped oil supply nozzle member 85 is fitted into the mounting hole 71d. In the oil supply nozzle member 85, the elastic support portion (elastic support piece 85 g) provided on the outer circumference is elastically deformed and fitted into the oil supply nozzle member mounting hole 71d. Then, the elastic support portion (elastic support piece 85 g) comes into contact with the inner peripheral surface of the oil supply nozzle member mounting hole 71d, and the oil supply nozzle member 85 is fixed to the oil supply nozzle member mounting hole 71d.

When the oil supply nozzle member 85 is attached to the oil reservoir member mounting hole 71d, the opening 71f is closed. The gap region formed between the oil reservoir member 85 and the inner wall 22c at a position facing the outboard side end of the input gear shaft 30 is the oil reservoir portion 22d.

The opening area of the nozzle portion 85a provided in the oil supply nozzle member 85 is smaller than the cross-sectional area of the tab 85h of the oil supply member 85, and the lubricating oil is stored in the oil reservoir 22d. The lubricating oil is fed into the input gear shaft 30 from the nozzle portion 85a that communicates with the oil reservoir portion 22d. Lubricating oil can be supplied while the lubricating oil is stored in the oil reservoir 22d.

As described above, the oil supply nozzle member 85 is provided with a nozzle portion 85a at the center thereof, and lubricating oil is supplied from the nozzle portion 85a into the input gear shaft 30. The nozzle portion 85a is inserted into the input gear shaft 30. Therefore, the outer diameter of the nozzle portion 85a is formed to be smaller than the inner diameter of the hollow shaft of the input gear shaft 30, so that they do not come into contact with each other.

The oil supply nozzle member 85 of the first embodiment will be described with reference to FIGS. 4 to 6. The oil supply nozzle member 85 is provided with a nozzle portion 85a extending in the axial direction at the center of the disk-shaped main body portion 85h. An edge portion 85f is provided on the outer periphery of the main body portion 85h. An elastic support piece 85 g, which is an elastic support portion formed by cutting up a plurality of radially outwards, is formed on the edge portion 85f.

The elastic support piece 85g is formed by cutting and raising so as to be curved outward in the radial direction and project toward the tip of the nozzle portion 85a, and elastically deforms when a force is applied inward in the radial direction. Then, when no force is applied, it returns to the outside in the radial direction. In this first embodiment, the elastic support pieces 85 g are provided at four positions of the edge portion 85f by shifting them by 90 degrees from each other.

In the oil supply nozzle member 85 of the first embodiment, the outer diameter of the edge portion 85f is slightly smaller than the inner diameter of the mounting hole 71d for the oil supply nozzle member, and the protruding tip of the elastic support piece 85g is the oil supply nozzle. It is formed so as to be larger than the inner diameter of the member mounting hole 71d. Since the elastic support piece 85g is formed by cutting and raising a notch 85e at the edge portion 85f, elastic deformation is easy. Due to this elastic deformation, the oil supply nozzle member 85 is inserted into the oil supply nozzle member mounting hole 71d. After the insertion, the elastic support piece 85 g comes into contact with the oil supply nozzle member mounting hole 71d, and the oil supply nozzle member 85 is fixed in the oil supply nozzle member mounting hole 71d.

As shown in FIG. 3, the oil supply nozzle member 85 is pushed into the oil supply nozzle member mounting hole 71d so that the nozzle portion 85a faces the input gear shaft 30 direction. At this time, the elastic support piece 85 g is curved outward in the radial direction and protrudes toward the tip of the nozzle portion 85a. That is, since the insertion side is small, it can be easily inserted into the oil supply nozzle member mounting hole 71d, and after insertion, the elastic support piece 85 g expands in the radial direction and is inside the oil supply nozzle member mounting hole 71d. The oil supply nozzle member 85 is attached and fixed in contact with the peripheral surface.

In this way, the oil supply nozzle member 85 is inserted and fixed in the oil supply nozzle member mounting hole 71d by the elastic deformation of the elastic support piece 85 g, so that there is a margin for each dimensional error. As a result, dimensional control can be afforded.

As shown in FIG. 1, when the oil supply nozzle member 85 is fitted into the oil supply nozzle member mounting hole 71d, the center of the nozzle portion 85a is formed so as to coincide with the axis M.

The gap region formed between the oil supply nozzle member 85 and the inner wall 22c at a position facing the outboard side end of the input gear shaft 30 becomes the oil reservoir 22d.

Further, the oil supply nozzle member 85 covers the rolling bearing 43 portion, suppresses the lubricating oil flowing from the outboard side to the inboard side directly entering the inside of the rolling bearing 43, and inputs the lubricating oil from the nozzle portion 85a to the hollow. It acts to feed into the gear shaft 30. The lubricating oil that has flowed out from the input gear shaft 30 and the lubricating oil that has wrapped around the nozzle portion 85a and the end portions of the input gear shaft 30 are supplied to the inside of the rolling bearing 43.

The lubricating oil accumulated in the oil reservoir 22d is sent from the oil supply nozzle member 85 into the hollow input gear shaft 30. Then, the lubricating oil is stably supplied to the joint portion by spline fitting the input gear shaft 30 and the motor rotating shaft 25. As a result, it is possible to prevent the occurrence of poor lubrication at the joint due to spline fitting.

As shown in FIG. 7, the outboard side housing 22b and the motor side housing 22a are assembled by arranging the motor side housing 22a at the bottom and covering the outboard side housing 22b from above. At this time, the oil supply nozzle member 85 is mounted in the oil supply nozzle member mounting hole 71d of the outboard side housing 22b. As described above, in the oil supply nozzle member 85, the elastic support piece 85 g is fixed in contact with the oil supply nozzle member mounting hole 71d. Therefore, the assembly can be performed without falling off from the oil supply nozzle member 85 from the oil supply nozzle member mounting hole 71d.

Since the elastic support piece 85 g of the oil supply nozzle member 85 is fixed in contact with the oil supply nozzle member mounting hole 71d, rattling during operation is prevented, noise is not generated, and the service life is deteriorated. Can be suppressed.

Next, a second embodiment of the present invention will be described with reference to FIGS. 8 to 11. Since the oil supply nozzle member 85 of the second embodiment is the same as the oil supply nozzle member 85 of the first embodiment except for the configuration of the elastic support portion, the same parts are designated by the same reference numerals, and their actions, effects, etc. In order to avoid duplication, the explanation is omitted here.

Similar to the first embodiment, the oil supply nozzle member 85 of the second embodiment is also provided with a nozzle portion 85a extending in the axial direction at the center of the disk-shaped main body portion 85h. An edge portion 85f is provided on the outer periphery of the main body portion 85h. A plurality of semicircular protrusions 85i serving as elastic support members are provided on the edge portion 85f, and the protrusions 85i are formed so as to project outward in the radial direction. In this second embodiment, protrusions 85i are provided at four positions on the edge 85f at positions 90 degrees apart from each other.

In the oil supply nozzle member 85 of the second embodiment, the outer diameter of the edge portion 85f is slightly smaller than the inner diameter of the mounting hole 71d for the oil supply nozzle member, and the semicircular apex portion of the protrusion 85i supplies oil. It is formed in a size located outside the nozzle member mounting hole 71d. When the oil supply nozzle member 85 is inserted into the mounting hole 71d for the oil supply nozzle member, the edge portion 85f is elastically deformed around the protrusion 85i. After the insertion, the protrusion 85i comes into contact with the inner peripheral surface of the oil supply nozzle member mounting hole 71d, and the oil supply nozzle member 85 is fixed to the oil supply nozzle member mounting hole 71d.

Since the protrusion 85i is formed at a position 90 degrees away from the edge 85f, the edge 85f including the protrusion 85i is easily elastically deformed. Due to this elastic deformation, the oil supply nozzle member 85 is inserted into the oil supply nozzle member mounting hole 71d. After the insertion, the protrusion 85i comes into contact with the inner peripheral surface of the oil supply nozzle member mounting hole 71d, and the oil supply nozzle member 85 is fixed to the oil supply nozzle member mounting hole 71d.

As shown in FIG. 11, the oil supply nozzle member 85 is pushed and fixed into the oil supply nozzle member mounting hole 71d so that the nozzle portion 85a faces the input gear shaft 30 direction. At this time, since the protrusion 85i is formed so as to protrude in a semicircular shape, it can be easily inserted into the mounting hole 71d for the oil supply nozzle member. After the insertion, the protrusion 85i comes into contact with the inner peripheral surface of the oil supply nozzle member mounting hole 71d, and the oil supply nozzle member 85 is mounted and fixed.

In the above-described embodiment, the elastic support pieces 85 g or the protrusions 85i are provided at four positions 90 degrees apart from each other, but the number is not limited to this, and the number of the elastic support pieces 85 g is three or more and is provided at equal intervals. Just do it.

In the above-described embodiment, the lubricating oil pumped up from the output gear 36a is sent to the oil reservoir 22d without providing the oil pump, but the lubrication sucked into the oil reservoir 22d by the oil pump. It may be configured to eject and send oil.

Further, in the above-described embodiment, the in-wheel motor drive device has been described as the vehicle motor drive device, but the present invention can be applied to the on-board vehicle motor drive device.

The present invention is not limited to the above-described embodiments, and it is needless to say that the present invention can be carried out in various forms without departing from the gist of the present invention. Indicated by the scope of the claim and further includes the equal meaning described in the claims, and all modifications within the scope.

10: In-wheel motor drive device 20: Housing 21: Motor housing 22: Reducer housing 22a: Motor side housing 22b: Outboard side housing 22d: Oil reservoir 25: Motor rotation shaft 26: Electric motor 30: Input gear shaft 71d : Mounting hole for oil supply nozzle member 85: Oil supply nozzle member 85a: Nozzle part 85f: Edge part 85g: Elastic support piece (elastic support part)
85i: Protrusion (elastic support)

Claims (6)

An electric motor unit that generates a driving force and a speed reducer unit that decelerates and outputs the rotation of the electric motor unit are provided. The reduction gear unit is housed in a reduction gear housing and has an input gear shaft having an input gear. An intermediate gear shaft having a large-diameter gear on the input side and a small-diameter gear on the output side and an output gear shaft having an output gear are provided, and the input gear shaft is coaxial with the motor rotation shaft of the electric motor unit by spline fitting. A vehicle motor drive that is connected to
The input gear shaft is composed of a hollow shaft, and an oil supply nozzle member for supplying lubricating oil into the hollow shaft of the input gear shaft is arranged on the outboard side of the input gear shaft.
The oil supply nozzle member has a nozzle portion inserted into the hollow shaft, a disk-shaped main body portion, and an elastic support portion protruding outward in the radial direction on the outer periphery of the main body portion.
The oil supply nozzle member is inserted into an oil supply nozzle member mounting hole provided in the speed reducer housing, and is fixed to the oil supply nozzle member mounting hole by the elastic support portion.
For vehicles, an oil reservoir for supplying lubricating oil to the oil supply nozzle member is formed between the inner wall of the speed reducer housing and the oil supply nozzle member fixed to the speed reducer housing. Motor drive. The vehicle according to claim 1, wherein the speed reducer housing is divided into a motor-side housing and an outboard-side housing, and the oil supply nozzle member mounting hole is provided in the outboard-side housing. For motor drive. One end of the input gear shaft rotates in a gear shaft mounting hole provided in the motor side housing, and the other end rotates in a gear shaft mounting hole provided in the inner wall of the outboard side housing via a rolling bearing. The vehicle motor drive device according to claim 2, wherein the gear shaft mounting hole is freely supported and the mounting hole for the oil supply nozzle member is provided coaxially on the outboard side of the gear shaft mounting hole. The vehicle according to any one of claims 1 to 3, wherein the oil supply nozzle member is provided with an edge portion on the outer periphery of the main body portion, and an elastic support portion is formed on the edge portion. For motor drive. The vehicle motor drive device according to claim 4, wherein the elastic support portion comprises an elastic support piece formed by cutting up the edge portion radially outward. The vehicle motor drive device according to claim 4, wherein the elastic support portion includes a semicircular protrusion formed on the edge portion and projects outward in the radial direction.

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