JP2021142818A - Sensor fitting structure for in-wheel motor drive device - Google Patents

Abstract

To provide a sensor fitting structure for an in-wheel motor drive device which has better assemblability than before.SOLUTION: An in-wheel motor drive device includes: an oil storage part 39t; an oil pump 41; a pipe part 43p extending to the oil pump from the oil storage part; and a sensor part 43s for detecting a state of the oil storage part, and circulates oil discharged from the oil pump therethrough, where the sensor part 43s is installed to the pipe part 43p.SELECTED DRAWING: Figure 2

Description

The present invention relates to a structure for detecting a state inside an in-wheel motor drive device.

Patent Document 1 describes an oil temperature sensor that is provided in an in-wheel motor drive device in which wheels are arranged in an inner space region and drives the wheels, and detects the temperature of oil circulating in the in-wheel motor drive device. The oil temperature sensor described in Patent Document 1 is arranged in an oil tank.

The in-wheel motor drive unit uses oil cooling to reduce the size, and has a built-in oil pump that circulates oil inside the in-wheel motor drive unit.

JP-A-2018-103977

The motor coil wire is covered with an insulating film such as enamel. When the temperature of the in-wheel motor drive device rises severely, there is a concern that the temperature of the motor coil may exceed the heat resistant temperature of the insulating coating formed on the surface of the motor coil wire. This will damage the insulating coating and cause a short circuit between the wires. This can lock the in-wheel motor drive. In order to prevent a short circuit of the motor coil, it is necessary to accurately measure the oil temperature of the cooling oil. This is the first issue.

The in-wheel motor drive is composed of a plurality of parts. In order to prevent the oil temperature sensor from moving inside the in-wheel motor drive device, it is conceivable to bolt the oil temperature sensor to the inner wall surface of the oil tank when assembling the in-wheel motor drive device. For example, the structure of the oil temperature sensor includes a thermistor and a metal stay bolted to the inner wall surface of the casing of the in-wheel motor drive device, and both the thermistor and the metal stay are insert-molded with resin.

However, the in-wheel motor drive device is being miniaturized for the purpose of being accommodated in the inner space area of the wheel. Therefore, if the internal space of the in-wheel motor drive device is narrow and the internal space is narrow, there are many restrictions on the arrangement of the oil temperature sensor and the wiring of the signal line, so that the optimum arrangement cannot be performed and the assembly workability is deteriorated. This is the second issue.

In view of the above circumstances, it is an object of the present invention to provide a structure having better assembly workability than the conventional one and capable of appropriately arranging an oil temperature sensor.

For this purpose, the in-wheel motor drive device according to the present invention includes an oil storage unit, an oil pump, a pipe unit extending from the oil storage unit to the oil pump, and a sensor unit for detecting the state of the oil storage unit. In the in-wheel motor drive device in which the oil discharged from the pump circulates inside, the sensor portion is provided in the pipe portion.

According to the present invention, since the sensor unit is provided in the pipe unit, the state of the oil storage unit such as the oil temperature can be stably detected. Therefore, the temperature of the motor coil can be appropriately controlled. Further, the sensor can be stably fixed in the narrow internal space of the in-wheel motor drive device. In addition, the conventional metal stay becomes unnecessary, and the assembly work is labor-saving.

As one aspect of the present invention, the sensor unit has a sensing portion and a resin sensor case that supports the sensing portion, and the pipe portion is made of metal and is surrounded by the sensor case.

As another aspect of the present invention, the sensor case of the pipe portion and the sensor portion is made of resin, and the pipe portion and the sensor portion are integrally formed. According to this aspect, since the sensor portion and the pipe portion are integrally connected, the durability is further improved.

As a preferred aspect of the present invention, the sensing portion of the sensor portion is exposed from a window penetrating the wall of the sensor case. According to this aspect, since the sensing portion is exposed from the window, the sensitivity of the sensing portion is improved, and the temperature of the motor coil can be known quickly.

As described above, according to the present invention, in the miniaturized in-wheel motor drive device, the sensor can be fixed at a suitable position inside the device, and the assembleability of the device is not impaired. Moreover, the temperature of the motor coil can be known correctly.

It is a developed sectional view which shows the in-wheel motor drive device. It is sectional drawing which shows the sensor mounting structure which becomes one Embodiment of this invention. It is a schematic vertical sectional view which shows the same embodiment. It is a figure which takes out and shows the sensor mounting structure from the same embodiment. It is a figure which takes out and shows the sensor mounting structure which becomes the modification of this invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a developed cross-sectional view showing an example of an in-wheel motor drive device to which the sensor mounting structure of the present invention is mounted. FIG. 2 is an overall view showing the sensor mounting structure of the present invention together with the inside of the in-wheel motor drive device, and shows a state in which the in-wheel motor drive device is viewed from the outside in the vehicle width direction. In FIG. 2 for facilitating the understanding of the invention, the casing on the front side of the paper surface, the wheel hub bearing portion, and the gears of the deceleration portion are removed to show the inner wall surface of the deceleration portion and the oil pump.

First, the outline of the in-wheel motor drive device 10 will be described. As shown in FIG. 1, the in-wheel motor drive device 10 includes a wheel hub bearing portion 11 provided at the center of a wheel, a motor portion 21 for driving the wheel, and a motor. A speed reducing portion 31 that decelerates the rotation of the portion 21 and transmits the rotation to the wheel hub bearing portion 11 is provided. The in-wheel motor drive device 10 is connected to the vehicle body of the electric vehicle via a suspension device (not shown).

The motor portion 21 is arranged so as to be offset from the axis O of the wheel hub bearing portion 11. The deceleration unit 31 is provided so as to straddle the axis O and the axis M of the motor unit 21. The axis O extends in the vehicle width direction and coincides with the axle. Regarding the position in the axis O direction, the wheel hub bearing portion 11 is arranged on one side of the in-wheel motor drive device 10 in the axial direction (also referred to as the outside in the vehicle width direction or the outboard side), and the motor portion 21 is the in-wheel motor drive device 10. It is arranged on the other side in the axial direction (also called the inside in the vehicle width direction or the inboard side). The deceleration unit 31 is arranged on one side of the motor unit 21 in the axial direction, and the axial position of the deceleration unit 31 overlaps with the axial position of the wheel hub bearing portion 11.

The wheels are those in which tires (not shown) are mounted on the outer circumference of the road wheel W shown by a virtual line in FIG. The in-wheel motor drive device 10 is arranged in the inner space region of the road wheel W. The wheel hub bearing portion 11 and the reduction gear portion 31 are housed in the inner space region of the road wheel W. The motor unit 21 projects from the inner space region of the road wheel W to the other side (inboard side) in the axial direction, but the motor unit 21 may be housed in the inner space region of the road wheel W as a modification (not shown).

As shown in FIG. 1, the wheel hub bearing portion 11 is a rotating inner ring / fixed outer ring, and is arranged coaxially with the inner ring 12 as a rotating wheel (hub ring) coupled to the road wheel W and the outer diameter side of the inner ring 12. It has an outer ring 13 as a fixed ring and a plurality of rolling elements 14 arranged in an annular space between the inner ring 12 and the outer ring 13.

The outer ring 13 is attached and fixed to the front portion 39f of the main body casing 39 by a coupling means such as a bolt 19. The front portion 39f is a casing wall portion that covers one end of the deceleration portion 31 in the axis O direction of the main body casing 39. The inner ring 12, the outer ring 13, and the rolling element 14 are made of steel and support the weight of the electric vehicle.

The motor unit 21 has a motor rotating shaft 22, a rotor 23, a stator 24, and a motor casing 29, and is sequentially arranged from the axis M of the motor unit 21 to the outer diameter side in this order. The motor unit 21 is an inner rotor or outer stator type radial gap motor, but may be another type of electric motor. For example, although not shown, the motor unit 21 may be an axial gap motor. The motor casing 29 surrounds the outer circumference of the stator 24.

A motor coil 24c is wound around the stator 24. The motor coil 24c is composed of a conductive wire, and the conductive wire is coated with a non-conductive material such as enamel. As a result, the wires are insulated from each other. One end of the motor casing 29 in the axis M direction is coupled to the back surface portion of the main body casing 39 of the reduction gear 31. In the following description, the boundary wall provided at one end of the motor casing 29 in the axial direction M direction and partitioning the inner air region of the main body casing 39 and the inner air region of the motor casing 29 is referred to as an end face portion 29b of the motor casing 29. The end face portion 29b is integrally formed with a back surface portion that seals the other end in the axial direction of the main body casing 39. Therefore, in the following description, the back surface portion of the main body casing 39 may also be collectively referred to as the end face portion 29b. That is, the end face portion 29b is a casing wall portion that covers the other end of the deceleration portion 31 in the axis O direction of the main body casing 39.

The other end of the motor casing 29 in the M direction of the axis is sealed with a plate-shaped motor casing cover 29v. The motor unit 21 of the present embodiment is a three-phase AC electric motor, but it may be a single-phase motor or a DC motor.

The main body casing 39, the motor casing 29, and the motor casing cover 29v form a casing that forms the outer shell of the in-wheel motor drive device 10, and are also simply referred to as casings. This casing is made of aluminum or an aluminum alloy. On the other hand, the internal parts of the casing, particularly the gears, rotating shafts and bearings described below, are made of steel.

Both ends of the motor rotating shaft 22 are rotatably supported by the end face portions 29b of the motor casing 29 and the motor casing cover 29v of the motor portion 21 via rolling bearings 27 and 28, respectively.

The axis M, which is the center of rotation of the motor rotating shaft 22 and the rotor 23, extends parallel to the axis O of the wheel hub bearing portion 11. That is, the motor portion 21 is offset so as to be separated from the axis O of the wheel hub bearing portion 11. For example, as shown in FIG. 2, the axis M of the motor unit is offset from the axis O in the vehicle front-rear direction, and is specifically arranged in front of the axis O of the vehicle.

As shown in FIG. 1, the speed reduction unit 31 includes an input shaft 32 coaxially coupled to the motor rotation shaft 22 of the motor unit 21, an input gear 33 coaxially provided on the outer peripheral surface of the input shaft 32, and a plurality of intermediate gears 34. , 36, an intermediate shaft 35 connected to the center of these intermediate gears 34, 36, an output shaft 38 connected to the inner ring 12 of the wheel hub bearing portion 11, and an output gear coaxially provided on the outer peripheral surface of the output shaft 38. It has 37 and a main body casing 39 for accommodating these a plurality of gears and a rotating shaft. Since the main body casing 39 forms the outer shell of the deceleration unit 31, it is also referred to as a deceleration unit casing.

The input gear 33 is a helical gear with external teeth. The input shaft 32 has a hollow structure, and one end 22e of the motor rotating shaft 22 in the axial direction is inserted into the hollow hole 32h of the input shaft 32 to spline fit (including serrations, the same applies hereinafter) so that the motor rotating shaft 22 cannot rotate relative to each other. The input shaft 32 is rotatably supported on both ends of the input gear 33 by the front portion 39f of the main body casing 39 and the end face portion 29b of the motor casing 29 via rolling bearings 32a and 32b, respectively.

The axis N, which is the center of rotation of the intermediate shaft 35 of the speed reduction unit 31, extends parallel to the axis O. Both ends of the intermediate shaft 35 are rotatably supported by the front portion 39f of the main body casing 39 and the end face portion 29b of the motor casing 29 via rolling bearings 35a and 35b. A first intermediate gear 34 is coaxially provided at the other end of the intermediate shaft 35 in the N direction of the axis. A second intermediate gear 36 is coaxially provided in the central region of the intermediate shaft 35 in the N direction of the axis. The developed cross-sectional view shown in FIG. 1 represents a cut surface obtained by cutting the in-wheel motor drive device 10 on a plane including the axes M and N and a plane including the axes N and O.

The first intermediate gear 34 and the second intermediate gear 36 are helical gears having external teeth, and the diameter of the first intermediate gear 34 is larger than the diameter of the second intermediate gear 36. The large-diameter first intermediate gear 34 is arranged on the other side of the second intermediate gear 36 in the N direction of the axis and meshes with the small-diameter input gear 33. The small-diameter second intermediate gear 36 is arranged on one side of the first intermediate gear 34 in the N direction of the axis and meshes with the large-diameter output gear 37.

As shown in FIG. 2, the axis N of the intermediate axis 35 is arranged above the axis O and the axis M. Further, the axis N of the intermediate shaft 35 is arranged in front of the vehicle with respect to the axis O and behind the vehicle with respect to the axis M. The reduction gear 31 including one intermediate shaft 35 is a three-axis parallel shaft gear reducer having axes O, N, and M arranged at intervals in the front-rear direction of the vehicle and extending in parallel with each other. It will be decelerated. As a modification (not shown), the speed reduction unit 31 may be a multi-stage parallel shaft gear speed reducer having a plurality of intermediate shafts.

The output gear 37 is a helical gear with external teeth, and is coaxially provided at the center of the axis O of the output shaft 38. The output shaft 38 extends along the axis O. As shown in FIG. 1, one end of the output shaft 38 in the O-axis direction is inserted into the center hole of the inner ring 12 and fitted so as not to rotate relative to each other. The central portion of the output shaft 38 in the axis O direction is rotatably supported by the front portion 39f of the main body casing 39 via a rolling bearing 38a on the outer diameter side of the other end of the inner ring 12 in the axis O direction. The other end of the output shaft 38 in the axis O direction is rotatably supported by the end face portion 29b of the motor casing 29 via the rolling bearing 38b. Further, at the other end of the output shaft 38, a pump drive shaft 38c having a diameter smaller than that of the inner ring of the rolling bearing 38b is extended.

The reduction gear 31 rotates the input shaft 32 by meshing the small-diameter drive gear and the large-diameter driven gear, that is, the meshing of the input gear 33 and the first intermediate gear 34, and the meshing of the second intermediate gear 36 and the output gear 37. Is decelerated and transmitted to the output shaft 38. The rotating element from the input shaft 32 to the output shaft 38 of the speed reducing unit 31 constitutes a drive transmission path that transmits the rotation of the motor unit 21 to the inner ring 12 of the wheel hub bearing unit 11.

In the main body casing 39, the wall parts of the front portion 39f and the wall parts of the end face portion 29b described above are joined together to partition the cylindrical space. The cylindrical space covers the internal parts of the speed reduction unit 31 so as to surround the axes O, N, and M extending in parallel with each other. The plate-shaped front portion 39f covers the internal parts of the speed reducing portion 31 from one side in the axial direction, and covers one end of the cylindrical space. The plate-shaped end face portion 29b covers the internal component of the speed reducing portion 31 from the other side in the axial direction, and covers the other end of the cylindrical space. The motor casing 29 is supported by the main body casing 39 and projects from the main body casing 39 to the other side in the axial direction.

The main body casing 39 partitions the internal space of the deceleration unit 31, and accommodates all the rotating elements (rotating shaft and gears) of the deceleration unit 31 in the internal space. As shown in FIG. 2, the lower part of the main body casing 39 is an oil storage portion 39t. When viewed in the M direction of the axis, the oil storage portion 39t has a trapezoidal shape, and becomes thicker toward the upper side and thinner toward the lower side.

The height position of the oil storage unit 39t is set below the motor unit 21 and the output gear 37. Oil that lubricates and cools the motor section 21 and the deceleration section 31 is stored in the oil storage section 39t that occupies the lower part of the internal space of the main body casing 39.

An opening 29c is formed in the end face portion 29b. The opening 29c penetrates the end face portion 29b and communicates the internal space of the motor portion 21 with the internal space of the deceleration portion 31. Oil passes through the opening 29c. The oil cools the motor unit 21 and lubricates the deceleration unit 31.

The input shaft 32, the intermediate shaft 35, and the output shaft 38 are both held and supported by the rolling bearings described above. These rolling bearings 32a, 35a, 38a, 32b, 35b, 38b are radial bearings.

When electric power is supplied to the motor unit 21 from the outside of the in-wheel motor drive device 10, the rotor 23 of the motor unit 21 rotates, and the rotation is output from the motor rotation shaft 22 to the deceleration unit 31. The speed reduction unit 31 decelerates the rotation input from the motor unit 21 to the input shaft 32, and outputs the rotation from the output shaft 38 to the wheel hub bearing unit 11. The inner ring 12 of the wheel hub bearing portion 11 rotates at the same rotation speed as the output shaft 38, and drives the road wheel W which is attached and fixed to the inner ring 12.

Next, the oil circulation circuit included in this embodiment will be described.

As shown in FIG. 2, an oil pump 41 is provided on the end face portion 29b. The oil pump 41 is a trochoidal pump and is arranged coaxially with the axis O. Specifically, a recess for accommodating the internal parts (internal gear and external gear) of the trochoid pump is formed in the end face portion 29b, and the recess is closed by the lid member 42. A through hole is formed in the center of the lid member 42, and the pump drive shaft 38c is passed through the through hole. The pump drive shaft 38c engages with an internal component of the oil pump 41 to drive the oil pump 41.

With reference to FIG. 2, the oil pump 41 is connected to the pipe portion 43p and the discharge path 44. The pipe portion 43p is a suction pipe extending in an inclined direction in the vertical direction, the lower end thereof is arranged in the oil storage portion at 39 tons, and the upper end is connected to the oil pump 41. The discharge path 44 extends obliquely upward from the oil pump 41 and connects to the pipe 45 at the upper part of the in-wheel motor drive device 10. In FIG. 2, since the pipe 45 extends parallel to the axis M across the motor unit 21 and the deceleration unit 31, only the cross section is shown.

The oil in the oil storage section 39t is sucked from the pipe section 43p, which is a suction pipe, discharged into the discharge path 44 by the oil pump 41, and supplied from the pipe 45 to the motor section 21 and the deceleration section 31. The oil then lubricates the internal space partitioned by the motor casing 29 and the body casing 39. At this time, the oil also serves to cool the motor casing 29 and the main body casing 39. The oil falls inside the motor unit 21 and the deceleration unit 31 and is stored in the oil storage unit 39t again. Hereinafter, the oil circulates inside the in-wheel motor drive device in the above-mentioned path.

As shown in FIG. 2, the pipe portion 43p is provided with the sensor portion 43s. The sensor portion 43s is provided at the lower end, that is, the tip end of the pipe portion 43p, and is arranged in the oil storage portion 39t.

FIG. 4 is a diagram showing the suction member 43 taken out. The suction member 43 includes a pipe portion 43p, a sensor case 43c of the sensor portion 43s, and a sensing portion 43d of the sensor portion 43s. The sensing portion 43d is an electric resistor such as a thermistor, and is covered with a sensor case 43c.

The pipe portion 43p of the present embodiment is made of metal, and the sensor case 43c is made of resin. The cross section of the sensor case 43c is larger than the cross section of the pipe portion 43p, and the pipe portion 43p and the sensing portion 43d are insert-molded into the sensor case 43c before the assembly of the in-wheel motor drive device 10. In this insert molding, a sensor case 43c is later created on the outer circumference of the pipe portion 43p and the surface of the sensing portion 43d prepared in advance, and the sensor case 43c surrounds the outer circumference of the pipe portion 43p and the sensing portion 43d. Surround the surface of. By this insert molding, the sensor case 43c is coupled to the pipe portion 43p and also to the sensing portion 43d. That is, the suction member 43 is one component and is treated as a sensor-integrated suction pipe.

A stop ring 43e is integrally formed on the outer circumference of the sensor case 43c. A bolt 46 is passed through the stop ring 43e as shown in FIG. The bolt 46 is screwed into a female screw hole formed in the inner wall surface of the end face portion 29b. As a result, the suction member 43 is bolted at the lower end. Further, the upper end of the pipe portion 43p is inserted and fixed to the suction port 41b formed in the end face portion 29b. The suction port 41b is a suction port of the oil pump 41. As a result, the upper end of the suction member 43 is connected to the oil pump 41.

A window 43f is formed in the sensor case 43c. The window 43f is a hole penetrating the wall of the sensor case 43c, and the sensing portion 43d is exposed from the window 43f. This improves the sensitivity of the sensing portion 43d.

A sensor cable 43g extends from the upper end of the sensor case 43c. The lower end of the sensor cable 43g is connected to the sensing portion 43d.

FIG. 3 is a schematic vertical sectional view of the in-wheel motor drive device 10, and shows the wiring of the sensor cable 43 g. The end of the sensor cable 43g is electrically connected to the signal extraction unit 69. The signal extraction unit 69 penetrates the motor casing cover 29v.

The signal extraction unit 69 is electrically connected to one end of an external signal cable 71 extending from the outside of the in-wheel motor drive device 10. The other end of the external signal cable 71 (not shown) is electrically connected to a drive control controller mounted on the vehicle body of the electric vehicle.

As an example, the signal extraction unit 69 includes an internal coupler 69b arranged inside the casing of the in-wheel motor drive device 10, an external coupler 69d arranged outside the casing of the in-wheel motor drive device 10, and these internal and external couplers 69b. , 69d is a connector type having a terminal block 69c interposed between them.

Inside the casing of the in-wheel motor drive device 10, the internal coupler 69b is electrically connected to the end of the sensor cable 43g and fitted to the inner portion of the terminal block 69c. Outside the casing of the in-wheel motor drive device 10, the external coupler 69d is electrically connected to one end of the external signal cable 71 and fitted to the outer portion of the terminal block 69c. The signal extraction unit 69 electrically conducts from the internal coupler 69b to the external coupler 69d, and transmits a sensor signal between the sensor cable 43g and the external signal cable 71.

By the way, the in-wheel motor drive device 10 of the present embodiment is provided in the oil storage section 39t, the oil pump 41, the pipe section 43p extending from the oil storage section 39t to the oil pump 41, and the oil storage section 39t provided in the pipe section 43p. The oil is sucked from the oil storage unit 39t and discharged from the oil pump 41, and circulates inside the in-wheel motor drive device 10. The sensor unit 43s and the pipe unit 43p form a suction member 43. As a result, when assembling the in-wheel motor drive device 10, by attaching the suction member 43 to the in-wheel motor drive device 10, the sensor unit 43s can also be attached. Therefore, the assembly performance is improved. In particular, since the in-wheel motor drive device 10 has been miniaturized so that it can be installed in the space inside the road wheel W, improvement in assembling property is advantageous for the in-wheel motor drive device.

Further, the oil level of the oil stored in the oil storage unit 39t is unstable, and it is difficult to stably detect the oil temperature of the oil. Since the sensor unit 43s of the present embodiment is provided on the suction member 43, it can be in constant contact with the oil and can stably detect the oil temperature. According to this embodiment, it is possible to correctly know the temperature of the motor coil 24c and prevent the stator 24 from becoming hot. Therefore, the risk of melting the coating of the conductive wire of the motor coil 24c is eliminated.

Further, in the sensor case 43c of the present embodiment, a window 43f penetrating the wall of the sensor case 43c is formed. Then, the sensing portion 43d is exposed from the window 43f. The window 43f improves the sensitivity of the sensing portion 43d, and the temperature of the motor coil 24c can be known quickly.

Next, a modification of the present invention will be described. FIG. 5 is an overall view showing a modified example of the present invention. Regarding this modification, the same reference numerals will be given to the configurations common to the above-described embodiments, and the description thereof will be omitted, and different configurations will be described below. In this modification, the suction member 43 is made of substantially resin. Specifically, the pipe portion 43p and the sensor case 43c are both made of resin, and the pipe portion 43p and the sensor portion 43s are integrally formed. The sensing portion 43d is molded in the sensor case 43c.

According to the embodiment shown in FIG. 5, the sensor portion 43s and the pipe portion 43p are integrally molded. As a result, the sensor unit 43s is mounted and fixed at a predetermined position inside the in-wheel motor drive device 10. Further, since the sensor unit 43s is also positioned by attaching the suction member 43, the assembling property of the in-wheel motor drive device 10 is improved. Further, since the sensor portion 43s is provided in the pipe portion 43p through which the oil constantly flows, the oil temperature of the oil can be correctly detected.

Although the embodiments of the present invention have been described above with reference to the drawings, the present invention is not limited to the illustrated embodiments. Various modifications and modifications can be made to the illustrated embodiment within the same range as the present invention or within the same range. For example, a part of the configurations may be extracted from the above-mentioned one embodiment, another part of the configurations may be extracted from the above-mentioned other embodiments, and these extracted configurations may be combined.

The present invention is advantageously utilized in electric vehicles and hybrid vehicles.

10 in-wheel motor drive, 11 wheel hub bearings,
21 motor section, 23 rotor, 24 stator,
24c motor coil, 31 speed reducer, 38 output shaft,
38c pump drive shaft, 39 main body casing, 29b end face part,
29c opening, 39t oil reservoir, 41 oil pump,
41b suction port, 42 lid member, 43 suction member,
43p pipe part, 43c sensor case, 43d sensing part,
43e stop ring, 43f window, 43g sensor cable,
43s sensor unit, 44 discharge path, 45 piping,
46 volts, 69 signal take-out section.

Claims (4)

An oil storage unit, an oil pump, a pipe unit extending from the oil storage unit to the oil pump, and a sensor unit for detecting the state of the oil storage unit are provided, and the oil discharged from the oil pump circulates inside. In the in-wheel motor drive
A sensor mounting structure for an in-wheel motor drive device, wherein the sensor portion is provided on the pipe portion. The sensor unit has a sensing portion and a resin sensor case that supports the sensing portion.
The sensor mounting structure for an in-wheel motor drive device according to claim 1, wherein the pipe portion is made of metal and is surrounded by the sensor case. The sensor mounting structure for an in-wheel motor drive device according to claim 1, wherein the pipe portion and the sensor case of the sensor portion are made of resin, and the pipe portion and the sensor portion are integrally formed. The sensor mounting structure for an in-wheel motor drive device according to any one of claims 1 to 3, wherein the sensing portion of the sensor portion is exposed from a window penetrating the wall of the sensor case.

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