JP4795764B2 - In-wheel motor system - Google Patents

Description

  The present invention relates to an in-wheel motor system used in a vehicle having a direct drive wheel as a driving wheel, and in particular, an in-wheel having a configuration in which the motor is supported to a vehicle suspension part via a buffer mechanism. It relates to a motor system.

In recent years, an in-wheel motor system in which a motor is built in a wheel is being adopted in a vehicle driven by a motor such as an electric vehicle. Among them, an in-wheel motor system configured to elastically support the in-wheel motor 3 with respect to a vehicle underbody part via a buffer mechanism 50 as shown in FIG. The in-wheel motor system includes a rotating side case 3b with a motor rotor 3R attached, a radially inner side open, and a concentric circle with the motor case 3b. The motor stator is spaced apart from the motor rotor 3R by a predetermined distance. The non-rotating side case 3a of the hollow direct drive motor 3 to which a non-rotating side case 3a to which 3S is attached and whose outer side in the radial direction is opened is rotatably connected via a bearing 3j is also illustrated in FIG. As shown in the figure, there are provided two plates 54 and 55 that are connected to each other by a spring 52 and a damper 53 that are operated in the vertical direction of the vehicle and are operated in the vertical direction of the vehicle via a linear guide 51. It is connected to a knuckle 5 that is an undercarriage part of a vehicle coupled to the axle 6 through a shock absorbing mechanism 50, and And Le 2, in-wheel motor system configured to couple with flexible coupling 60 has been proposed as a mutually eccentric possible driving force transmission mechanism in the radial direction of the wheel 2. In FIG. 5, 1 is a tire attached to the wheel, 4 is a hub portion connected to the wheel 2 and its rotating shaft, 7 is a suspension member made of a shock absorber, etc., and 8 is attached to the hub portion 4. The reference numerals 52n and 53n in FIG. 5 are receiving members for the spring 52 and the damper 53, respectively.
In this way, by adopting a configuration in which the in-wheel motor 3 is elastically supported with respect to the undercarriage part of the vehicle via the buffer mechanism 50, the motor 3 is floating-mounted with respect to the undercarriage part of the vehicle. Therefore, the motor 3 itself can act as the weight of the dynamic damper, and both the ground contact performance and riding comfort performance when traveling on rough roads can be greatly improved (for example, Patent Document 1).

However, although the above-described buffer mechanism 50 can securely mount the motor 3 to the undercarriage parts of the vehicle, the number of parts is large, and the four linear motion guides 51 and the springs 52 are respectively moved up and down. Since it is necessary to assemble in parallel with the direction, a high assembling accuracy is required. Therefore, there is a problem that the assembling work takes time.
Therefore, in order to solve the above problems, the applicant of the present application includes linear bearings 12a and rods 12b as shown in FIGS. 6A and 6B instead of the linear motion guide 51 and the spring 52. An in-wheel motor system including a buffer mechanism 50Z using a linear motion guide 12 with a spring in which a linear motion guide 12A and spring members 12B and 12B that operate in the vehicle vertical direction are integrated is proposed (Japanese Patent Application 2003). No. 4,257,668). The buffer mechanism 50Z includes a motor-side plate 54, a knuckle-side plate 55, the above-mentioned linear guide 12 with a spring and the cylinder 15a for connecting the plates 54 and 55, a piston (not shown), and a shaft 15b connected to the piston. Specifically, a fixing member 55m, 55n is provided on the knuckle side plate 55, and a linear bearing 12a which is a fixing portion of the spring-equipped linear guide 12 and a cylinder of the damper 15 are provided. 15a is fixed, and fixing members 54n and 54n are provided on the motor side plate 54, and the tip of the rod 12b, which is the movable part of the linear guide 12 with spring, and the tip of the shaft 15b of the damper 15 are fixed. As a result, the structure of the buffer mechanism can be simplified and the number of parts can be reduced. , It is possible to improve productivity, it can be produced at low cost in-wheel motor
WO 02/083446 A1

By the way, the conventional shock-absorbing mechanism 50Z provided with the above-mentioned linear guide 12 with a spring and the damper 15 has a dynamic damper effect in response to an input when traveling on a general road surface with relatively little unevenness. Since the characteristics are set, if there is an excessive input from the road surface, the motor 3 may move too much and hit the wheel 2 and break down.
Therefore, as shown in FIG. 7, a stopper mechanism 59 comprising a stopper bar 59a and a stopper member 59b is provided between the fixing members 54n, 54n provided on the motor side plate 54 and the knuckle side plate 55, and the buffer Although a method of restricting the amount of vertical displacement of the mechanism 50Z is also conceivable, the fixing members 54n and 54n themselves protrude in the axial direction from the motor side plate 54, so that there is enough room for the hydraulic piping of the brake device 8 to pass therethrough. It is difficult to manufacture the stopper mechanism 59 where there is no.

  The present invention has been made in view of the conventional problems, and an object thereof is to provide an in-wheel motor system having a configuration in which a stopper member of a buffer mechanism is arranged without reducing space efficiency.

The invention described in claim 1 of the present application includes an annular motor rotor, an annular motor stator disposed at a predetermined interval on the radially inner side of the motor rotor, and an annular motor stator that accommodates the motor stator. A non-rotating side case, a linear motion guide with a spring in which a linear motion guide and a spring member are integrated, and a buffer mechanism for supporting the non-rotating side case on a knuckle that is an undercarriage part of a vehicle. In the in-wheel motor system, a protrusion that protrudes from one end in the vehicle front-rear direction of the knuckle side plate for fixing the buffer member to the knuckle is provided toward the non-rotation side case, and the non-rotation side case At the inner peripheral side, a stopper bar such as a rubber bush is attached so as to face the upper surface and the lower surface of the protrusion, respectively, and the maximum displacement amount of the buffer member is set. In which was set to win.
The invention described in claim 2 is the in-wheel motor system according to claim 1, wherein the buffer mechanism is a buffer mechanism including a spring-equipped linear motion guide in which a linear motion guide and a spring member are integrally formed. A hollow disk-shaped rib member protruding radially inward from the inner peripheral side of the non-rotating side case, and fixing the upper and lower receiving portions of the spring-coupled linear guide to the rib member, and the spring The protrusion is provided on a fixing member for fixing the attached linear motion guide to the knuckle side plate, and the stopper bar is attached to each of the upper and lower receiving portions.

According to the present invention, in an in-wheel motor system configured to support an in-wheel motor with respect to a knuckle that is an undercarriage part of a vehicle via a buffer mechanism, a knuckle side plate for fixing the buffer member to the knuckle A protrusion projecting from an end of the vehicle in the front-rear direction toward the non-rotating side case of the motor that houses the motor stator, and on the inner peripheral side of the non-rotating side case, Since the maximum amount of displacement of the buffer member is restricted by attaching a rubber bush or other stop para bar so as to face each other, the vertical direction of the buffer mechanism is ensured with a simple configuration while securing an axial space. The maximum amount of displacement can be easily regulated.
At this time, the buffer mechanism is a buffer mechanism including a linear guide with a spring in which a linear guide and a spring member are integrally formed, and a hollow disk protruding radially inward from the inner peripheral side of the non-rotating side case A rib member is provided to fix the upper and lower receiving portions of the spring-powered linear guide to the rib member, and the protrusion is provided to the fixing member for fixing the spring-powered linear guide to the knuckle side plate. If the stopper bar is attached to each of the upper and lower receiving portions, the motor side plate can be omitted, and the buffer mechanism can be reduced in size and weight.

Hereinafter, the best mode of the present invention will be described with reference to the drawings.
FIGS. 1A, 1B, and 2 are views showing a state in which the shock absorbing mechanism 10 used in the in-wheel motor system according to the best mode is attached to the in-wheel motor 3. In each figure, reference numeral 11 denotes A knuckle side plate 12 connected to a knuckle 5 which is an undercarriage part of a vehicle connected to an axle (not shown) is a spring in which a linear motion guide 12A composed of a linear bearing 12a and a rod 12b and a spring member 12B are integrally formed. A linear motion guide 13 is a second linear motion guide 13 disposed in parallel with the spring linear motion guide 12. The linear bearing 12a, which is a fixed portion of the spring linear motion guide 12, and the second linear motion guide 12. The 13 linear bearings 12a are fixed to a fixing member 11n attached to the knuckle plate 11, and the rod 12b and the rod which are the movable parts. Tip of 3b is on, via the member 14, 14 receive guide below, are mounted respectively on the non-rotating side case 3a of the motor 3. Reference numeral 15 denotes a single rod type damper composed of a cylinder 15a, a piston, and a shaft 15b connected to the piston. The cylinder 15a, one end of which is a fixing portion, is fixed to a fixing member 12n attached to the knuckle side plate 11. The tip of the shaft 15b, which is a movable part, is attached to the non-rotating side case 3a via a damper receiving member 16. In order to make the drawing easier to see, the knuckle 5 is omitted in FIG.

In this example, a protrusion 17 projects radially outward from a fixing member 11n for fixing the fixing portion of the spring-equipped linear motion guide 12 and the second linear motion guide 13, and the upper and lower guide receivers are provided. Semi-spherical rubber bushes 18A and 18B functioning as stopper bars are attached to positions corresponding to the upper and lower surfaces of the protrusions 17 of the members 14 and 14, respectively, and stoppers are provided by the protrusions 17 and the rubber bushes 18A and 18B. A mechanism 19 is configured to suppress the maximum displacement amount of the buffer mechanism 10. Thereby, even when a large vibration is input to the tire, the hemispherical rubber bushes 18A and 18B hit the protrusion 17, and the buffer mechanism 10 is not displaced further upward or downward. Therefore, since the clearance between the wheel 2 and the motor 3 can be kept at a predetermined value or less, excessive deformation of the motor 3 can be suppressed and damage to the motor 3 can be prevented.
As shown in FIGS. 3 (a) and 3 (b), a hollow disk-like rib member 20 protruding radially inward is provided on the inner peripheral side of the non-rotating side case 3a of the motor, so that the motor cases 3a, 3b are provided. The rib member 20 is provided with a notch 20k for disposing the upper and lower guide receiving members 14, 14, and the guide receiving members 14, 14 are provided in the notch 20k. If it is set as the structure attached, compared with the buffer mechanism 50Z shown in FIG. 6, while being able to fully ensure the space of an axial direction, the stroke width of the buffer mechanism 10 can be fully ensured.
Specifically, the guide receiving member 14 is inserted into and fixed to the distal ends of the rods 12b and 13b of the linear guide 12 with spring and the linear guide 13, and the receiving portion 14a is cut out. It comprises arcuate mounting portions 14b and 14c for mounting on both sides of the portion 20k, and the mounting portions 14b and 14c are connected to the cutout portion 20k in a state where the receiving portion 14a is fitted into the cutout portion 20k. By fixing to the rib members 20 on both sides, the stroke width of the buffer mechanism 10 can be sufficiently secured.
At this time, the rubber bushes 18 </ b> A and 18 </ b> B may be fixed to the mounting holes 14 h provided on the surface 14 d corresponding to the protruding portion 17 of the mounting portion 14 c on the protruding portion 17 side of the receiving member 14.

  Thus, according to this best mode, the hollow disk-shaped rib member 20 protruding radially inward is provided on the inner peripheral side of the non-rotating side case 3a of the in-wheel motor 3, and the rib member 20 is further provided with the rib member 20. A notch portion 20k is provided to receive the rod 12b, which is the movable portion of the linear guide 12 with the spring, the spring member 12B, and the rod 13b of the linear guide 13, and the lower guide receiving members 14, 14 as described above. A protrusion 17 is provided projecting radially outward from a fixing member 11n that fixes the fixed portion of the spring-equipped linear motion guide 12 and the second linear motion guide 13 and is disposed in the notch 20k. Hemispherical rubber bushings 18A and 18B are attached to positions corresponding to the upper and lower surfaces of the protrusion 17 of the guide receiving members 14 and 14, respectively, to suppress the maximum displacement of the buffer mechanism 10. -Since the mechanism 19 is configured, the clearance between the wheel 2 and the motor 3 can be kept below a predetermined value, excessive deformation of the motor 3 can be suppressed, and sufficient axial space is secured. can do.

In the above-described best mode, the shock absorbing mechanism 10 including the linear motion guide 12 with the spring, the linear motion guide 13 and the damper 15 has been described. However, the present invention is not limited to the linear motion guide 12 with the spring and the damper 15. Needless to say, the present invention can also be applied to the buffer mechanism 50Z including the above.
In the above example, the protrusion 17 is provided on the fixing member 11n that fixes the fixing portion of the linear guide 12 with the spring and the second linear guide 13, but protrudes radially outward from the knuckle side plate 11. A protrusion may be provided.
Instead of the stopper member 19, hemispherical rubber bushes 18A and 18B are attached to the upper and lower surfaces of the protrusion 17, and the rubber bushes 18A and 18B of the upper and lower guide receiving members 14 and 14 are attached. The same effect can be obtained by using a stopper member having a structure in which a bar extending in the direction of the protrusion 17 is provided from a position opposed to the protrusion.

  As described above, according to the present invention, the maximum displacement amount of the buffer mechanism can be regulated with a simple configuration and without reducing the space efficiency, so that the stability of the in-wheel motor system can be easily secured. can do.

It is a figure which shows the structure of the buffer mechanism provided with the stopper mechanism which concerns on the best form of this invention. It is a perspective view which shows the structure of the buffer mechanism provided with the stopper mechanism. It is a figure which shows the attachment method of the guide receiving member which concerns on this best form. It is a figure which shows the structure of the conventional in-wheel motor system. It is a figure which shows the structure of the conventional buffer mechanism. It is a figure which shows the structure of the buffer mechanism provided with the linear motion guide with a spring and the linear motion guide with a spring. It is a figure which shows an example of the stopper mechanism of a buffer mechanism.

Explanation of symbols

3 in-wheel motor, 3a non-rotating side case, 3b rotating side case,
5 knuckle, 10 buffer mechanism, 11 knuckle side plate,
11n, 11m fixing member, 12 linear motion guide with spring, 12A linear motion guide,
12B Spring member, 12a Linear bearing, 12b Rod,
13 Second linear guide, 14 Guide receiving member, 15 Damper,
15a cylinder, 15b shaft, 16 damper receiving member,
17 Protrusion, 18A, 18B Rubber bushing, 19 Stopper mechanism,
20 Rib member, 20k Notch.

Claims (2)

  An annular motor rotor, an annular motor stator disposed at a predetermined interval on the radially inner side of the motor rotor, an annular non-rotating side case for housing the motor stator, a linear guide and a spring member An in-wheel motor system including a shock absorbing mechanism that supports the non-rotating side case on a knuckle that is an undercarriage part of a vehicle. A protrusion that protrudes from one end of the knuckle-side plate in the longitudinal direction of the vehicle toward the non-rotating side case is provided, and an upper surface of the protruding portion is provided on the inner peripheral side of the non-rotating side case. A stopper rubber is attached so as to face the lower surface, and the maximum displacement amount of the buffer member is regulated. System. The shock absorbing mechanism is a shock absorbing mechanism including a linear motion guide with a spring in which a linear motion guide and a spring member are integrally formed, and a hollow disk-shaped rib protruding radially inward from the inner peripheral side of the non-rotating side case Members are provided to fix the upper and lower receiving portions of the spring-loaded linear motion guide to the rib member, and the protrusions are provided to a fixing member for fixing the spring-directed linear motion guide to the knuckle side plate. The in-wheel motor system according to claim 1, wherein the stopper rubber is attached to each of the receiving portions.

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