JP2016059195A - In-wheel motor drive - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an in-wheel motor drive which enhances the sealing properties of the mating surfaces of the motor housing and the rear cover.SOLUTION: In an in-wheel motor drive (21) including a motor section (A) and a wheel hub bearing (C), a casing (22) that forms the outline of the in-wheel motor drive (21) includes a cylindrical motor housing (22a), and a rear cover (22d) closing the opening end of the motor housing (22a), and the outer edge of the mating surfaces of the motor housing (22a) and rear cover (22d) is filled entirely with liquid gasket.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an in-wheel motor drive device.

  The in-wheel motor drive device includes a motor unit, a deceleration unit that receives a driving force from the motor unit and decelerates the number of rotations to output to the wheel side, and a wheel hub bearing unit that is coupled to the output shaft of the deceleration unit. It has. As a conventional in-wheel motor drive device, JP, 2011-240772, A (patent documents 1) shown in Drawing 9 is mentioned, for example. As shown in FIG. 9, the in-wheel motor drive device of Patent Document 1 includes a motor part A, a reduction part B, and a wheel hub bearing part C, and includes a motor housing 101 and one axial direction of the motor housing 101. The rear cover 102 that covers the opening on the side forms an outline of the motor part A. The motor housing 101 and the rear cover 102 are abutted and coupled in the axial direction via an O-ring 103.

JP 2011-240772 A

  However, unlike an engine housed in a hood at the upper part of the automobile chassis, the in-wheel motor drive device is arranged at the lower part of the chassis and in the vicinity of the road surface and is exposed to the outside of the vehicle. Although the in-wheel motor drive device is housed in a wheel of a tire, the entire in-wheel motor drive device does not fit in the wheel and a part thereof is exposed. Since the motor part A of the in-wheel motor drive device often comes to the inside of the vehicle body, the motor housing 101 of the motor part A is partly exposed. And since it is exposed, mud, water, etc. which the tire repels adhere to the motor housing 101. In the conventional in-wheel motor drive device such as Patent Document 1 described above, when mud or water splashed by the tire adheres to the mating surface between the motor housing 101 and the rear cover 102, water enters the gap, and the O-ring 103 The present inventor has found that there is a problem in that corrosion products such as rust are generated around. When rusting occurs on the mating surfaces, the gap between the mating surfaces becomes large due to the influence of the rust, and a crushing margin necessary for the O-ring 103 cannot be secured, and the sealing performance of the mating surfaces decreases.

  In view of the above problems, an object of the present invention is to provide an in-wheel motor drive device that improves the sealing performance of the mating surfaces of the motor housing and the rear cover.

  The above problem is caused by the fact that the O-ring 103 is disposed for the purpose of sealing from the inside to the outside, such as preventing the internal lubricating oil from being discharged to the outside in the motor part A. The inventor found. Thus, as a result of intensive studies to prevent water from entering from the outside into the mating surface between the motor housing and the rear cover, the inventors have found that a liquid gasket is applied to the mating surface and completed the present invention.

  That is, the in-wheel motor drive device of the present invention is an in-wheel motor drive device including a motor portion and a wheel hub bearing portion, and a casing that forms an outer shell of the in-wheel motor drive device includes a cylindrical motor housing and And a rear cover for closing the opening end of the motor housing, and the entire outer edge of the mating surface of the motor housing and the rear cover is filled with a liquid gasket.

  According to the in-wheel motor drive device of the present invention, since the liquid gasket is disposed and cured on the entire outer edge of the mating surface between the motor housing and the rear cover, it is possible to suppress water from entering the mating surface. For this reason, corrosion resistance improves and it can suppress that rust arises in a mating surface. Therefore, the sealing performance of the mating surfaces can be improved.

  Preferably, in the in-wheel motor drive device of the present invention, at least one of the entire inner edge and the entire outer edge is chamfered in at least one of the motor housing and the rear cover constituting the mating surface, and the chamfered portion is filled with a liquid gasket. .

  Thereby, when the liquid gasket before hardening is arrange | positioned on a mating surface and it hardens | cures, a liquid gasket can be filled into the chamfered part. The allowable amount of elongation of the liquid gasket filled in the chamfered portion is large. For this reason, the chamfered portion is filled even when a large external force is applied due to vibration in the direction in which the motor housing and the rear cover are separated due to the in-wheel motor drive device being mounted in the vehicle wheel. The liquid gasket can absorb a large external force. For this reason, durability by vibration can be improved.

  In the in-wheel motor drive device of the present invention, preferably, the entire inner edge is chamfered in at least one of the motor housing and the rear cover constituting the mating surface.

  Thereby, when the liquid gasket before hardening is arrange | positioned on a mating surface and it hardens | cures, a liquid gasket can be filled into the chamfered part of the inner edge. For this reason, it can suppress that the liquid gasket hardened | cured from the inner edge of the mating surface protrudes. Therefore, it is possible to reduce the possibility that the hardened liquid gasket is detached from the mating surfaces and enters the motor portion to become a foreign matter.

  The in-wheel motor drive device of the present invention may further include an O-ring disposed on the mating surface.

  If the outer edge of the mating surface is filled with a liquid gasket, water can be prevented from entering from the outside. Therefore, even if an O-ring is further provided on the mating surface, the sealing performance can be improved.

  According to the in-wheel motor drive device of the present invention, the sealing performance of the mating surfaces of the motor housing and the rear cover can be improved.

1 is a longitudinal sectional view schematically showing an in-wheel motor driving device in an embodiment of the present invention. It is a cross-sectional view which shows roughly the in-wheel motor drive device in embodiment of this invention. It is the longitudinal cross-sectional view which expanded the area | region III in FIG. It is a longitudinal cross-sectional view of other embodiment corresponded to the longitudinal cross-sectional view of FIG. FIG. 4 is a longitudinal sectional view of still another embodiment corresponding to the longitudinal sectional view of FIG. 3. FIG. 4 is a longitudinal sectional view of still another embodiment corresponding to the longitudinal sectional view of FIG. 3. FIG. 4 is a longitudinal sectional view of still another embodiment corresponding to the longitudinal sectional view of FIG. 3. FIG. 4 is a longitudinal sectional view of still another embodiment corresponding to the longitudinal sectional view of FIG. 3. It is a longitudinal cross-sectional view which shows the in-wheel motor drive device in patent document 1.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following drawings, the same or corresponding parts are denoted by the same reference numerals, and description thereof will not be repeated.

  The in-wheel motor drive device 21 includes a motor unit A that generates a driving force, a deceleration unit B that decelerates and outputs the rotation of the motor unit A, and a wheel hub bearing that transmits the output from the deceleration unit B to driving wheels. Part C. The motor part A, the speed reduction part B, and the wheel hub bearing part C are arranged coaxially in this order along the axis O direction of the in-wheel motor drive device 21.

  The casing 22 forms an outline of the in-wheel motor drive device 21. The casing 22 includes a cylindrical motor housing 22a that extends along the axis O, and a rear cover 22d that closes an opening end of the motor housing 22a (an opening end located on the opposite side of the speed reduction portion B in the direction of the axis O). Including. The motor housing 22a and the rear cover 22d are butted together in the direction of the axis O.

  The motor unit A is a radial gap motor including a motor housing 22a, a rear cover 22d, a stator 23, a rotor 24, and a motor rotating shaft 35. The stator 23 is fixed to the inner peripheral surface of the motor housing 22a. A coil 23c is wound around the stator 23. A rotor 24 is arranged at a position facing the inner side of the stator 23 with a radial gap. The rotor 24 is formed so as to protrude radially outward from the outer periphery of the motor rotating shaft 35 and the rotor main body 24a having a hollow cylindrical shape in which a plurality of discs having a through hole in the center are stacked. A cylindrical rotor support 24b that is fixed to the inner periphery and supports the rotor main body 24a at the axial center of the motor rotation shaft 35 is provided. A motor rotating shaft 35 is fixedly connected to the inside of the rotor 24 and rotates integrally with the rotor 24. The axial end of the motor rotation shaft 35 located on the side opposite to the speed reduction portion B is rotatably supported by the center portion of the rear cover 22d via a rolling bearing 36a. The axial end of the motor rotating shaft 35 located on the side close to the speed reduction portion B is passed through the center hole of the inward flange portion 22e of the motor housing 22a, and the center hole of the inward flange portion 22e via the rolling bearing 36b. Is supported rotatably. Further, of the both ends of the motor rotation shaft 35, the end located on the side closer to the speed reduction part B is connected and fixed to the input shaft 25 of the speed reduction part B by, for example, serration fitting. Since the motor rotation shaft 35 of the motor part A and the input shaft 25 of the speed reduction part B extend along the substantially horizontal axis O and rotate together, the assembly of the motor rotation shaft 35 and the input shaft 25 is a motor side rotation member. Called.

  The speed reduction part B includes a cylindrical speed reduction housing 22b. The deceleration unit B includes an input shaft 25, an output shaft 28, and a cycloid reduction mechanism that transmits rotation between the input shaft 25 and the output shaft 28. Specifically, of the both ends of the input shaft 25, eccentric members 25a and 25b provided eccentrically at two positions of the end of the input shaft 25 on the side far from the motor rotation shaft 35, and the inner periphery of the eccentric member 25a. 25b, two curved plates 26a, 26b as revolving members which are attached to the outer periphery of the rotating shaft 25b so as to be relatively rotatable and perform a revolving motion around the rotation axis along with the rotation of the input shaft 25, and a curved curve A plurality of outer pins 27 as outer peripheral engagement members that engage with the outer peripheral portions of the plates 26a and 26b (see FIG. 2) to cause the rotational motion of the curved plates 26a and 26b, and only the rotation of the curved plates 26a and 26b. A motion conversion mechanism for taking out and transmitting it to the output shaft 28. Further, the deceleration unit B is supplied with lubricating oil by a lubricating oil circulation mechanism described later.

  Referring to FIG. 2, the curved plate 26 b has a plurality of corrugations composed of trochoidal curves such as epitrochoids on the outer peripheral portion, a plurality of through holes 30 a penetrating from one end face to the other end face, and A through hole 30b is provided at the center. A plurality of through holes 30a are provided at equal intervals on a circumference centered on the rotation axis of the curved plate 26b, and receive an inner pin 31 described later. The through hole 30b is provided at the center (rotation axis) of the curved plate 26b, and holds the outer peripheral surface of the eccentric member 25b so as to be concentric. The same applies to the curved plate 26a.

  The motion conversion mechanism is composed of a plurality of inner pins 31 as inner engaging members implanted in the flange portion 28a (see FIG. 1) of the output shaft 28, and through holes 30a provided in the curved plates 26a and 26b. Is done. The inner pins 31 are provided at equal intervals on a circumferential orbit centering on the axis O that is the rotation axis of the output shaft 28, and extend parallel to the axis O of the output shaft 28, as shown in FIG. The root end of the inner pin 31 is fixed to the output shaft 28.

  Through this motion conversion mechanism, the output shaft 28 arranged coaxially with the input shaft 25 takes out the rotation of the curved plates 26a, 26b as the output of the deceleration unit B. As a result, the rotation of the input shaft 25 is decelerated by the deceleration unit B and transmitted to the output shaft 28. Therefore, even when the low torque, high rotation type motor unit A is employed, it is possible to transmit the necessary torque to the drive wheels.

  In order to reduce friction loss, sliding portions between the input shaft 25 and the through holes 30b of the curved plates 26a and 26b, and between the inner pin 31 and the through holes 30a of the curved plates 26a and 26b. Is in rolling contact via a rolling bearing. Since both ends of the outer pin 27 are held by the housing 22b via rolling bearings (needle bearings), the curved plates 26a and 26b and the outer pin 27 are in rolling contact.

  As shown in FIG. 1, the lubricating oil circulation mechanism includes a lubricating oil pump 51, a discharge oil passage 54, a casing oil passage 55, a communication oil passage 56, a motor rotation shaft oil passage 58a, and a speed reduction unit input shaft oil. A passage 58b, radial oil passages 59a and 59b, an annular groove 60g (see FIG. 2), an oil supply hole 60h (see FIG. 2), a discharge oil passage 57, a lubricating oil tank 53, and a suction oil passage 52. The lubricating oil is circulated in this order. Thereby, the lubricating oil circulation mechanism performs lubrication and cooling of the speed reduction part B.

  As shown in FIG. 1, the wheel hub bearing portion C includes a hub wheel 32 fixedly connected to the shaft portion 28 b of the output shaft 28, and a wheel hub bearing 33 that holds the hub wheel 32 rotatably with respect to the casing 22. With. The wheel hub bearing 33 is a double-row angular ball bearing, and an inner ring member 33 n is fitted and fixed to the outer peripheral surface of the hub ring 32. A plurality of balls (rolling elements) 33 b are arranged in the annular gap between the outer ring member 33 g and the inner ring member 33 n and the hollow portion 32 a of the hub ring 32. Further, a plurality of balls 33 b are also arranged in the annular gap between the outer ring member 33 g and the hub ring 32.

  The outer ring member 33g of the wheel hub bearing 33 is fixed to the axial end of the speed reduction housing 22b. The hub wheel 32 includes a cylindrical hollow portion 32a that is coupled to the shaft portion 28b of the output shaft 28, and a flange portion 32b that is formed at an end portion of the shaft portion 28b that is far from the speed reduction portion B. A drive wheel (not shown) is fixedly connected to the flange portion 32b by a bolt 32c and a taper nut (not shown). Since the output shaft 28 of the speed reduction part B and the hub wheel 32 of the wheel hub bearing part C extend along the substantially horizontal axis O and rotate integrally, the assembly of the output shaft 28 and the hub wheel 32 is a wheel side rotating member. Called.

  The drive wheels are arranged on the outermost side in the vehicle width direction of the vehicle, have a sufficiently larger outer diameter than the in-wheel motor drive device 21, and are grounded on the road surface. Thereby, the clearance from the contact surface of the drive wheel to the casing 22 is ensured.

  The casing 22 has a cylindrical shape in which cylindrical motor housings 22 a and reduction housings 22 b having different outer diameters are connected in the direction of the axis O, and constitutes an outline of the in-wheel motor drive device 21. The motor housing 22a having a large outer diameter constitutes the outline of the motor part A. The reduction housing 22b having a small outer diameter constitutes the outline of the reduction portion B.

  The motor housing 22a of the casing 22 has the largest outer diameter in the in-wheel motor drive device 21, and includes a hollow cylindrical wall centering on the axis O and an inward flange portion 22e. The speed reduction housing 22b, which is a part located in the speed reduction portion B of the casing 22, has the next largest outer diameter, and includes a hollow cylindrical wall centering on the axis O and an inward flange portion 22h.

  A rear cover 22d is attached and fixed to the end of the motor housing 22a in the axial direction on the side far from the speed reduction portion B by both bolts 22f. The rear cover 22d is a disk-shaped wall member that becomes a part of the casing 22, and seals the opening at the axial end of the motor housing 22a. An inward flange portion 22e is integrally formed at the axial end located on the side closer to the speed reduction portion B of both ends in the axial direction of the motor housing 22a. The inward flange portion 22 e is a disc-shaped portion that becomes a part of the casing 22, and partitions the internal space of the motor part A and the internal space of the speed reduction part B. One axial end of the speed reduction housing 22b is fixed to the inward flange portion 22e with a bolt 22g. A lubricating oil pump 51 is provided on the inward flange portion 22e.

  An inward flange portion 22h is integrally formed at the axial end on the side closer to the wheel hub bearing portion C of both ends in the axial direction of the deceleration housing 22b. The inward flange portion 22 h is a disk-shaped portion that becomes a part of the casing 22. A flange portion 33f of the outer ring member 33g of the wheel hub bearing 33 is fixed to the inward flange portion 22h by a bolt 22i.

  Here, the mating surfaces of the motor housing 22a and the rear cover 22d will be described with reference to FIGS. 3 to 8, the upper side is the inside of the in-wheel motor driving device 21, and the lower side is the outside of the in-wheel motor driving device 21.

  As shown in FIGS. 3-8, the liquid gasket 70 is filled in the whole outer edge of the mating surface of the motor housing 22a and the rear cover 22d. The liquid gasket 70 of the present embodiment is filled at least at the outer edge along the circumferential direction. The mating surface is a surface orthogonal to the axis O, and is an axis perpendicular surface extending in an arc around the axis O.

  The liquid gasket 70 is a substance having fluidity, and when applied to the joint surface, the liquid gasket 70 is cured after a predetermined time to form an elastic or adhesive film. The liquid gasket 70 includes organic solvent types such as modified alkyd, fiber ester, and synthetic rubber, solventless types such as phenol, modified ester, silicone, and acrylic, and aqueous types such as aqueous acrylic. In addition, since it has high heat resistance, a silicone type is preferable. The thickness of the liquid gasket 70 is, for example, 10 μm or more and 100 μm or less.

  Specifically, in the structure shown in FIG. 3, the end surface of the motor housing 22a and the end surface of the rear cover 22d constituting the mating surface are flat surfaces and are not chamfered. The liquid gasket 70 extends from the outer edge to the inner edge of the mating surfaces. That is, the liquid gasket 70 is filled in the entire mating surface.

  The structure shown in FIGS. 4-8 has shown the mating surface structure of other embodiment from FIG. In the structure shown in FIG. 4, the entire inner edge (entire circumference) and the entire outer edge (full circumference) of the surface portion constituting the mating surface of the motor housing 22a are chamfered, and the surface portion constituting the mating surface of the rear cover 22d is a flat surface. It is not chamfered. In the structure shown in FIG. 5, the entire outer edge of the surface portion constituting the mating surface of the rear cover 22d is chamfered, the inner edge of the surface portion constituting the mating surface of the rear cover 22d, the outer edge and the inner edge constituting the mating surface of the motor housing 22a are It is not chamfered. That is, the mating surface of the motor housing 22a is a flat surface. In the structure shown in FIGS. 6 and 7, the entire inner edge of the surface portion constituting the mating surface of the motor housing 22a is chamfered to constitute the outer edge of the surface portion constituting the mating surface of the motor housing 22a and the mating surface of the rear cover 22d. The outer and inner edges of the face portion are not chamfered. That is, the end surface of the rear cover 22d in FIGS. 6 and 7 is a flat surface. In the structure shown in FIG. 8, the entire outer edge of the surface portion constituting the mating surface of the motor housing 22a is chamfered, the inner edge of the surface portion constituting the mating surface of the motor housing, and the outer edge of the surface portion constituting the mating surface of the rear cover 22d. And the inner edge is not chamfered. That is, the end surface of the rear cover 22d in FIG. 8 is a flat surface. Thus, it is preferable that at least one of the entire inner edge and the entire outer edge is chamfered in at least one of the motor housing 22a and the rear cover 22d constituting the mating surface.

  4 to 6, the liquid gasket 70 extends from the outer edge to the inner edge of the mating surfaces. That is, the liquid gasket is filled in the entire chamfered portion. 7 and 8, the liquid gasket 70 extends from the outer edge of the mating surface to the front of the inner edge, and the liquid gasket 70 is not filled in the inner edge of the mating surface. Specifically, in the structure shown in FIG. 7, the liquid gasket 70 is filled in a part of the chamfered portion, and the liquid gasket 70 is not filled in the inner edge of the chamfered portion. In the structure shown in FIG. 8, the liquid gasket 70 extends from the outer edge of the mating surface to the front of the O-ring 71, and the inner edge is not filled with the liquid gasket 71.

  In the structure shown in FIG. 8, an O-ring 71 is filled on the inner edge side of the mating surface between the motor housing 22a and the rear cover 22d. The O-ring 71 continues all around the axis O. The O-ring 71 is made of, for example, rubber or resin.

  As shown in FIGS. 4 to 8, in the case of having a chamfered mating surface, an angle θ at which the extending direction of the non-chamfered surface portion intersects the extending direction of the chamfered portion is, for example, It is 20 degrees or more and 30 degrees or less.

  As described above, the in-wheel motor drive device 21 of the present embodiment is an in-wheel motor drive device 21 that includes the motor part A and the wheel hub bearing part C, and is an outline of the in-wheel motor drive apparatus 21. The casing 22 includes a cylindrical motor housing 22a and a rear cover 22d that closes the opening end of the motor housing 22a. The entire outer edge of the mating surface of the motor housing 22a and the rear cover 22d is filled with a liquid gasket. ing.

  According to the in-wheel motor drive device 21 of the present embodiment, the entire outer edge (entire circumference along the circumferential direction) of the mating surface of the motor housing 22a and the rear cover 22d is filled and cured. . Thereby, it can prevent that water permeates into the inside of the mating surface. That is, it can prevent effectively that water contacts a mating surface. For this reason, since it can prevent that a corrosive atmosphere is formed in a mating surface, the corrosion resistance of a mating surface improves and it can suppress that rust arises. Therefore, the sealing performance of the mating surfaces can be improved.

  In order to suppress water from entering the mating surface from the outside, it is sufficient that the liquid gasket 70 is filled on the entire outer edge of the mating surface. From the viewpoint of improving the durability of the liquid gasket 70, the liquid gasket 70 is used. Is preferably extended from the outer edge toward the inner edge, and is preferably filled to more than half the area of the mating surface (from the outer edge to the center position of the mating surface).

  The in-wheel motor drive device 21 of the present embodiment is formed by placing a liquid gasket on the entire outer edge of one of the motor housing 22a and the rear cover 22d constituting the mating surface and pressing the other. When the liquid gasket before curing is pressed in a state where the mating surface is filled, the liquid gasket spreads along the mating surface (along the direction orthogonal to the axis O). For this reason, it is preferable to include a portion for filling the liquid gasket so that the liquid gasket does not protrude from the mating surface. From this point of view, as shown in FIGS. 4 to 7, in the in-wheel motor drive device 21 of the present embodiment, at least one of the entire inner edge and the entire outer edge in at least one of the motor housing 22a and the rear cover 22d constituting the mating surface. It is preferable that one side is chamfered and the chamfered portion is filled with the liquid gasket 70. Such a structure is not limited to the structure shown in FIGS. 4 to 7. For example, in the motor housing 22 a and the rear cover 22 d, the entire outer edge of the mating surface may be chamfered, or the inner edge of the mating surface of the rear cover 22 d. The whole may be chamfered alone or in combination with the structure of FIGS.

  In particular, from the viewpoint of reducing the possibility that the hardened liquid gasket is peeled off from the inner edge of the mating surface and enters the inside of the motor part A to become a foreign substance, as shown in FIGS. In the drive device 21, it is more preferable that at least one of the motor housing 22 a and the rear cover 22 d constituting the mating surface, the entire inner edge is chamfered and the chamfered portion is filled with the liquid gasket 70. From the viewpoint of ease of formation, as shown in FIGS. 4, 6, and 7, the rear cover 22d constituting the mating surface is not chamfered, and the entire inner edge of the motor housing 22a is chamfered, and the motor housing 22a is chamfered. The liquid gasket 70 may be filled between the portion and the rear cover 22d.

  The liquid gasket 70 filled in the chamfered portion can largely follow the elongation as compared with the liquid gasket 70 filled in the non-chamfered portion. For this reason, even if a large external force due to vibration is applied in a direction in which the motor housing 22a and the rear cover 22d are separated due to the in-wheel motor drive device 21 being mounted in the wheel of the vehicle, the chamfered portion The filled liquid gasket 70 can absorb a large external force. For this reason, the in-wheel motor drive device 21 of this Embodiment can improve the durability by vibration.

  In the present embodiment, the in-wheel motor drive device 21 including the motor part A, the speed reduction part B, and the wheel hub bearing part C has been described as an example. However, in the present invention, the speed reduction part B is omitted. Includes an in-wheel motor drive device directly connected to the motor.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above-described embodiment but by the scope of claims, and is intended to include all modifications within the meaning and scope equivalent to the scope of claims.

  The in-wheel motor drive device of the present invention is advantageously used in electric vehicles, hybrid vehicles, and the like.

21 in-wheel motor drive device, 22 casing, 22a motor housing, 22b reduction housing, 22d rear cover, 22e, 22h inward flange portion, 22f, 22g, 22i, 32c bolt, 23 stator, 23c coil, 24 rotor, 24a rotor body 24b rotor support, 25 input shaft, 25a, 25b eccentric member, 26a, 26b curved plate, 27 outer pin, 28 output shaft, 28a, 32b flange portion, 28b shaft portion, 30a, 30b through hole, 31 inner pin, 32 hub wheel, 32a hollow part, 33 wheel hub bearing, 33b ball, 33f flange part, 33g outer ring member, 33n inner ring member, 35 motor rotating shaft, 36a, 36b bearing, 51 lubricating oil pump, 52 suction oil passage, 53 lubrication Oil tank, 54 discharge oil passage, 55 casing oil passage 56 communication oil passage, 57 discharge oil passage, 58a motor rotation shaft oil passage, 58b speed reduction part input shaft oil passage, 59a, 59b radial oil passage, 60g annular groove, 60h oil supply hole, 70 liquid gasket, 71 O-ring A motor Part, B deceleration part, C wheel hub bearing part, O axis.

Claims (4)

An in-wheel motor drive device comprising a motor part and a wheel hub bearing part,
A casing that forms an outline of the in-wheel motor drive device includes a cylindrical motor housing and a rear cover that closes an opening end of the motor housing,
An in-wheel motor drive device in which the entire outer edge of the mating surface of the motor housing and the rear cover is filled with a liquid gasket. In at least one of the motor housing and the rear cover constituting the mating surface, at least one of the entire inner edge and the entire outer edge is chamfered,
The in-wheel motor drive device according to claim 1, wherein the liquid gasket is filled in a chamfered portion.   The in-wheel motor drive device according to claim 2, wherein the entire inner edge is chamfered in at least one of the motor housing and the rear cover constituting the mating surface. The in-wheel motor drive device according to claim 1, further comprising an O-ring disposed on the mating surface.

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