JP2014159275A - In-wheel motor driving device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an in-wheel motor device which enables proper attachment fixture of a brake device and proper connection with the vehicle body side.SOLUTION: An in-wheel motor device (11) includes: a casing (12) including a cylindrical part and a housing; a wheel hub (13) which is rotatably supported at the vehicle body outer side of the casing when viewed in an axial direction; a motor (14) which is stored in the cylindrical part of the casing and drives the wheel hub; and a speed reduction mechanism which is stored in the housing of the casing and drivably coupled to the motor; and a brake device (15) which is provided at an outer surface of the housing of the casing and puts a brake on the wheel hub. The brake device is fixedly attached to the outer surface of the housing of the casing, and the outer surface of the housing of the casing is coupled to a suspension device at the vehicle body side.

Description

  The present invention relates to an appropriate mounting and fixing structure for a brake device of an in-wheel motor drive device.

  The most common cables extending from the wheel to the vehicle body side are cables such as a wheel speed sensor harness, a brake hose, and a brake pipe. As a technique related to the cable, conventionally, for example, those described in Japanese Patent Laid-Open No. 2003-287069 (Patent Document 1) and Japanese Patent Laid-Open No. 2-158448 (Patent Document 2) are known. In the electric brake device for a vehicle described in Patent Document 1, a wheel speed sensor for detecting the rotation speed of a wheel is attached in the vicinity of the wheel hub, and the wheel speed sensor and the caliper of the electric disc brake are connected to each other by a first harness. The caliper and the main controller on the vehicle body side are connected to each other by a second harness. In the vehicle described in Patent Document 2, a hydraulic brake unit is provided on each of the front, rear, left, and right wheels, and a brake pipe extends from each hydraulic brake unit to the master cylinder of the vehicle body.

JP 2003-287069 A JP-A-2-158448

  The present invention relates to an in-wheel motor device that is disposed in an in-wheel area of a wheel and drives the wheel, and an object thereof is to provide an appropriate mounting and fixing of a brake device and an appropriate connection with a vehicle body side.

  To this end, an in-wheel motor device according to the present invention includes a casing including a cylindrical portion and a casing, a wheel hub that is rotatably supported outside the casing in the axial direction of the casing, and a wheel hub that is accommodated in the cylindrical portion of the casing. A speed reduction mechanism that is housed in the casing of the casing and is coupled to the motor, and a brake device that is provided on the outer surface of the casing and that brakes the wheel hub. It is attached and fixed to the outer surface of the body, and the outer surface of the casing of the casing is connected to a suspension device on the vehicle body side.

  Preferably, the brake device is an electric brake device having a caliper and an actuator.

It is a perspective view which shows the in-wheel motor drive device which becomes one Example of this invention. It is a side view which shows the in-wheel motor drive device of the Example. It is a perspective view which expands and shows the locking tool provided in the in-wheel motor drive device of the Example. It is sectional drawing which shows the state which cut | disconnected the locking tool shown in FIG. 3 by IV-IV, and was seen from the direction of the arrow. It is a figure which shows typically the latching state of an electric brake cable. It is a figure which shows typically the latching state of an electric brake cable about another Example.

  Hereinafter, embodiments of the present invention will be described in detail based on examples shown in the drawings.

  FIG. 1 is a perspective view showing an in-wheel motor driving apparatus according to one embodiment of the present invention. FIG. 2 is a side view showing the in-wheel motor driving apparatus of the embodiment. FIG. 3 is an enlarged perspective view showing a locking tool provided in the in-wheel motor drive device of the embodiment. FIG. 4 is a cross-sectional view showing a state in which the locking tool shown in FIG. 3 is cut along IV-IV and viewed from the direction of the arrow. FIG. 5 is a diagram schematically showing a locked state of the electric brake cable.

  The in-wheel motor drive device 11 is disposed in an inner space area of a wheel (not shown) of the wheel and drives the wheel. The in-wheel motor drive device 11 is suspended along with the wheels by a vehicle body (not shown) of an electric vehicle and a hybrid vehicle.

  The in-wheel motor drive device 11 includes a casing 12, a wheel hub 13 that is rotatably supported outside the axial body of the casing 12, a motor 14 that is housed in the casing 12 and drives the wheel hub, and an outer side of the casing 12. An electric brake device 15 provided on the surface for braking the wheel hub 13, an electric brake cable 22 extending in the axial direction from the electric brake device 15 to the inside of the vehicle body, and an electric brake cable 22 provided on the outer surface of the casing 12 And a locking tool 23 for locking the process.

  One side of the casing 12 is a housing 12b having a complicated shape, and the other side of the casing 12 is a cylindrical portion 12a having a cylindrical shape. A plurality of holes 12h are formed on the outer surface of the casing 12b of the casing. The in-wheel motor drive device 11 is connected to the suspension device on the vehicle body side using these holes 12h.

  A motor 14 is provided inside the cylindrical portion 12a of the casing, and a motor rotation shaft (not shown) extends to one side along the central axis of the casing cylindrical portion 12a and is drivingly coupled to a speed reduction mechanism accommodated in the housing 12b. . The deceleration mechanism decelerates the rotation speed of the motor rotation shaft and transmits it to the wheel hub 13. The wheel hub 13 is supported through a rolling bearing on one side of the housing 12b. A wheel (not shown) is connected and fixed to the outer end surface of the vehicle body of the wheel hub 13. A disk rotor 24 is coupled to the wheel hub 13. Accordingly, the disk rotor 24 rotates at the same speed as the wheels.

  The electric brake device 15 is attached and fixed to the outer surface of the housing 12 b and has a caliper 16 and an actuator 17. The caliper 16 is located on the outer periphery of the disk rotor 24 and straddles both surfaces of the disk rotor 24. The actuator 17 presses the brake pads in the caliper 16 against both surfaces of the disc rotor 24 by electric power to brake the wheels.

  The electric brake cable 22 extending in the axial direction from the actuator 17 of the electric brake device 15 to the inside of the vehicle body is connected to a vehicle-side brake controller (not shown). In addition, the axial direction here is an axial direction of the wheel hub 13. The electric brake cable 22 is a bundle of a power line and a signal line, and supplies power to the actuator 17. However, control signals can be transmitted and received between the actuator 17 and the brake controller.

  A connection portion 33 between the electric brake device 15 and the electric brake cable 22 is sealed with a filler having elasticity. This prevents foreign matter such as dust and water droplets from entering the connection portion 33 between the electric brake device 15 and the electric brake cable 22.

  A locking tool 23 is provided on a portion of the outer surface of the casing 12 on the inner side of the vehicle body in the axial direction than the electric brake device 15. Specifically, the locking tool 23 is provided at the inner end of the casing body 12a on the outer surface of the casing in the axial direction. Referring to FIG. 3, the locking tool 23 is attached to a pair of protrusions 25 integrally formed on the outer surface of the casing cylindrical part 12 a and the protrusions 25, 25 to attach the electric brake cable 22. And a lid member 26 held between the pair of protrusions 25, 25.

  The protrusions 25 are wall members that face each other with a gap in the circumferential direction of the cylindrical portion 12 a, and the electric brake cable 22 can be passed between these protrusions 25. Bolt holes are drilled at the tips of the protrusions 25. The lid member 26 is provided with two bolt through holes. The lid member 26 is arranged at the tips of the pair of projections 25, 25 so that these holes coincide with each other, and the holes are screwed together with bolts 27, so that the lid member 26 is engaged with the pair of projections 25, 25. Mounting is fixed. The lid member 26 holds the electric brake cable 22 between the pair of protrusions 25 and 25.

  According to this embodiment, since the electric brake cable 22 may be inserted between the pair of protrusions 25 and 25 and the lid member 26 may be attached, the electric brake cable 22 can be easily positioned and the assembly work can be improved. To do.

  Thus, one middle portion of the electric brake cable 22 is locked to the outer surface of the casing 12 by the locking tool 23. Thus, the root portion 22a of the electric brake cable 22 from the position where the electric brake cable 22 is locked by the locking tool 23 to the electric brake device 15 is arranged so as not to loosen along the outer surface of the casing 12, and the axial direction Extend to. Further, the distal end portion 22b of the electric brake cable 22 extending further inwardly of the vehicle body from the locking portion of the electric brake cable 22 is made bendable.

  With reference to FIG. 4, a pillow-like pedestal portion 28 is provided along the outer surface of the casing cylindrical portion 12 a. The pedestal 28 is located between the pair of protrusions 25 and 25 and connects the bases of the protrusions 25 to each other. A lid member 26 is installed at the tips of the pair of protrusions 25, 25. Thus, the region surrounded by the pedestal 28, the pair of protrusions 25 and 25, and the lid member 26 forms a passage 29 through which the electric brake cable 22 passes.

  Further, the passage 29 may be formed by using the pedestal portion 28 and the protruding portion 25 as a substantially U-shaped integral part.

  The surfaces of both ends of the passage 29 are rounded. That is, the opposing surfaces of the pair of projecting portions 25 facing each other are rounded to 25 m so that the cross-sectional shape of the passage 29 gradually increases from the back to the end of the passage 29. The opposing surfaces of the pedestal 28 and the lid member 26 facing each other are also configured such that the cross-sectional shape of the passage 29 gradually increases from the back to the end of the passage 29, and the end of the lid member 26 is rounded. 26m, the end of the pedestal 28 is rounded 28m.

  According to this embodiment, the end surface of the passage 29 is rounded so that the cross-sectional shape of the passage 29 gradually increases from the back to the end of the passage 29, so that the electric brake cable 22 is engaged. It is possible to avoid stress concentration at the end surface of the passage 29 when the electric brake cable 22 is repeatedly bent at the locking portion locked by the stopper 23. Therefore, the durability of the electric brake cable 22 is improved.

  Referring to FIG. 5, the electric brake cable 22 includes an electric brake cable root side portion 22 a closer to the electric brake device 15 than the locking tool 23, and an electric brake cable tip side portion 22 b closer to the front end than the locking tool 23. Are connected together. The electric brake cable root side portion 22a is fixed to the surface of the casing 12, and is not repeatedly bent. On the other hand, the electric brake cable tip side portion 22b allows repeated bending.

  Next, another embodiment of the present invention will be described. FIG. 6 is a diagram schematically showing a locked state of an electric brake cable according to another embodiment of the present invention. The electric brake cable 22 has a connector 31 at a locking position where the electric brake cable 22 is locked by the locking tool 23, and the electric brake cable distal end portion 22 b further extending from the locking position is connected to the electric brake via the connector 31. An electric brake cable root side portion 22a extending toward the device 15 is detachably connected.

  The connector 31 includes a socket portion 31a attached to the tip of the electric brake cable root side portion 22a and a plug 31b attached to the end of the electric brake cable tip side portion 22b. The outer peripheral surface of the socket part 31 a is held by the locking tool 23. The plug 31b is inserted into the socket portion 31a and electrically connects the electric brake cable root side portion 22a and the electric brake cable tip side portion 22b.

  According to the embodiment shown in FIG. 6, by connecting the plug 31b to the socket portion 31a in the work of attaching the in-wheel motor drive device 11 to the vehicle body, the connection work between the electric brake device 15 and the brake controller on the vehicle body side can be performed. Complete. Therefore, the assembly efficiency is improved.

  Although the embodiments of the present invention have been described with reference to the drawings, the present invention is not limited to the illustrated embodiments. Various modifications and variations can be made to the illustrated embodiment within the same range or equivalent range as the present invention. For example, the in-wheel motor drive device 11 may have a structure in which the motor rotation shaft of the motor 14 and the wheel hub 13 are directly connected without having a speed reduction mechanism. Further, the number of the locking tools 23 is not limited to one, and a plurality of locking tools 23 may be provided on the outer peripheral surface of the cylindrical portion 12a. The electric brake cable 22 may also include a sensor cable that extends from a sensor that is provided on the outer surface of the casing 12 or housed inside the casing 12.

  The in-wheel motor drive device according to the present invention is advantageously used in electric vehicles and hybrid vehicles.

  DESCRIPTION OF SYMBOLS 11 In-wheel motor drive device, 12 Casing, 13 Wheel hub, 14 Motor, 15 Electric brake device, 16 Caliper, 17 Actuator, 22 Electric brake cable, 22a Root side part, 22b Tip side part, 23 Locking tool, 24 Disc Rotor, 25 protrusion, 26 lid member, 28 pedestal, 29 passage, 31 connector, 33 connection point.

Claims (2)

  A casing including a cylindrical portion and a casing, a wheel hub that is rotatably supported outside the casing in the axial direction of the casing, a motor that is housed in the cylindrical portion of the casing and drives the wheel hub, and a casing of the casing A reduction mechanism that is housed in a body and is drivingly coupled to the motor, and a brake device that is provided on an outer surface of the casing of the casing and brakes the wheel hub, the brake device being an outer surface of the casing of the casing The in-wheel motor drive device is characterized in that the outer surface of the casing of the casing is connected to a suspension device on the vehicle body side.   The in-wheel motor drive device according to claim 1, wherein the brake device is an electric brake device having a caliper and an actuator.

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