JP2007190966A - In-wheel motor system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve and stabilize the performance of a dynamic vibration absorber in an in-wheel motor system constructed so that a motor and a vehicle unsprung part are coupled by the dynamic vibration absorber including a hydraulic damper and a guide member. <P>SOLUTION: In mounting an in-wheel motor on the vehicle unsprung part in a floating manner, the dynamic vibration absorber 20 including a motor mounting member 21 fitted to the side surface of a motor case 10a of an electric motor 10, a knuckle fitting member 22 fitted to a knuckle 5, a spring member 23 connecting the motor mounting member 21 and the knuckle fitting member 22, two guide members 24, 24 for guiding the operating direction of the spring member 23, and a hydraulic damper disposed parallel to the guide members 24, 24 is disposed on the side surface of the electric motor 10 in front side of a vehicle, the electric motor 10 and the knuckle 5 are connected to each other, and the hydraulic damper 2 and the guide members 24, 24 can be effectively cooled. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an in-wheel motor system configured to attach an in-wheel motor to a vehicle unsprung member via a dynamic vibration absorber and use the mass of the motor as the mass of the dynamic vibration absorber.

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, a hollow-shaped in-wheel motor 50 as shown in FIG. 8 is elastically supported with respect to an undercarriage part of a vehicle via a dynamic vibration absorber 60, and the mass of the motor 50 is reduced by the dynamic damper. An in-wheel motor system that is configured to act as a mass and excellent in ride comfort and road holding property has attracted attention (see, for example, Patent Documents 1 and 2).
More specifically, the in-wheel motor system includes a rotation-side case 52 to which a motor rotor 51 is attached, the radially inner side being opened, and a concentric arrangement with the rotation-side case 52, and a predetermined distance from the motor rotor 51. The non-rotating side case 54 of the hollow in-wheel motor 50 that is rotatably connected via a bearing 55 to a non-rotating side case 54 having a motor stator 53 attached thereto and having a radially outer side opened. The rotary side case is connected to a knuckle 72, which is a vehicle undercarriage part connected to an axle 71, via a dynamic vibration absorber 60 including a linear guide 61A, a spring member 61B, and a hydraulic damper 64. 52 and the wheel 73 are coupled by a flexible coupling 80 which is a driving force transmission mechanism that can be eccentric to each other in the radial direction of the wheel 73. One in which the.
Specifically, the dynamic vibration absorber 60 linearly moves a motor side plate 62 attached to the non-rotating side case 54 of the motor 50 and a knuckle side plate 63 connected to the knuckle 72, as shown in FIG. The guide 61A and the spring member 61B are integrally formed by a spring-equipped linear motion guide 61, and a hydraulic damper 64 including a hydraulic cylinder 64a, a piston (not shown), and a shaft 64b connected to the piston. Specifically, fixing members 63m and 63n are provided on the knuckle side plate 63 to fix the linear bearing 61a that is the fixing portion of the linear motion guide 61 with the spring and the cylinder 64a that is the fixing portion of the hydraulic damper 64. A rod which is a movable part of the linear guide 61 with a spring provided with fixing members 62n and 62n on the motor side plate 62 Has a structure for fixing the front end portion of the shaft 64b 1b is a movable portion of the tip and the hydraulic damper 64 of the.
In FIG. 7, 74 is a tire attached to the wheel, 75 is a hub connected to the wheel 73 and its rotating shaft, 76 is a suspension member such as a shock absorber, and 77 is attached to the hub 75. Brake disc.

On the other hand, as an example of using an inner rotor type electric motor as an in-wheel motor, a case 93 of a geared motor 90 in which an electric motor 91 and a reduction gear mechanism 92 are combined as shown in FIG. From the lower side, it is sandwiched by dampers 94a and 94b in which oil is sealed in rubber, and is connected to a knuckle 95 which is a vehicle unsprung part. The dampers 94a and 94b are further connected to the knuckle 95 and the upper part. A structure is proposed in which the geared motor 90 is floating mounted below the vehicle spring by connecting to ball joints 97a and 97b that connect the lower arms 96a and 96b (see, for example, Patent Document 3).
JP 2005-178684 A JP 2005-329911 A JP 2005-126037 A

However, in the hollow in-wheel motor 50, since the dynamic vibration absorber 60 is incorporated inside the motor 50, the hydraulic damper 64 and the linear guide 61A do not cool well, and the hydraulic damper Since the viscosity of the 64 damper oil may be reduced or grease applied between the linear bearing 61a and the rod 61b of the linear guide 61A may flow out, the performance of the dynamic vibration absorber 60 may be reduced. was there.
On the other hand, when an elastic body such as the dampers 94a and 94b is used as a buffer mechanism for floating mounting the motor or geared motor below the vehicle spring, as in the example using the inner rotor type motor, In addition to lack of stability as compared with the case of using a buffer mechanism including a spring member and a guide member, such as the linear guide 61 with a spring used in the dynamic vibration absorber 60 described above, Since the dampers 94a and 94b are also provided at locations that are difficult to cool, the viscosity of the oil in the dampers 94a and 94b is lowered, so that there is a problem that the performance as a dynamic vibration absorber is lowered. It was.

  The present invention has been made in view of the conventional problems, and in an in-wheel motor system having a configuration in which a motor and a lower part of a vehicle spring are coupled by a dynamic vibration absorber having a hydraulic damper and a guide member. The purpose is to improve and stabilize the performance of the mechanical vibration absorber.

The invention according to claim 1 of the present application is an in-wheel having a configuration in which a motor for driving a wheel is attached to a vehicle unsprung member via a dynamic vibration absorber, and the mass of the motor is used as the mass of the dynamic vibration absorber. In the motor system, the dynamic vibration absorber is composed of a spring member, a hydraulic damper, a cylinder and a guide shaft disposed between the motor and the lower part of the vehicle spring, and the operation of the spring member and the hydraulic damper. It comprises a guide member for guiding the direction, and the hydraulic damper and the guide member are arranged on the front side of the vehicle.
The invention according to claim 2 is the in-wheel motor system according to claim 1, wherein the motor is connected to an electric motor and an output shaft of the motor, and the rotation speed of the motor is reduced and transmitted to the wheel. And a geared motor provided with a mechanism.
According to a third aspect of the present invention, in the in-wheel motor system according to the first or second aspect of the present invention, a motor mounting member that is mounted on a side surface of a motor case that supports the stator side of the motor and a wheel portion are connected. A knuckle attachment member to be attached to the knuckle to be provided, and the motor attachment member and the knuckle attachment member are coupled by the spring member, the hydraulic damper, and the guide member.

  According to the present invention, an electric motor that drives a wheel, or a geared motor that includes an electric motor and a reduction gear mechanism that is connected to an output shaft of the motor and that reduces the rotation of the motor and transmits it to the wheel, And a hydraulic damper, and a cylinder and a guide shaft, and are attached to the lower part of the vehicle spring via a dynamic vibration absorber provided with a guide member for guiding the operating direction of the spring member and the hydraulic damper. Since the hydraulic damper and the guide member are arranged on the front side of the vehicle so that the hydraulic damper and the guide member can be effectively cooled, the oil viscosity of the hydraulic damper and the guide member Grease can be prevented from flowing out. Therefore, the performance of the dynamic vibration absorber can be improved and stabilized.

Hereinafter, the best mode of the present invention will be described with reference to the drawings.
1 and 2 are diagrams showing the configuration of an in-wheel motor system according to the best mode. In each figure, 1 is a tire, 2 is a wheel composed of a rim 2a and a wheel disc 2b, and 3 is the wheel 2 described above. And a wheel hub 5 connected at its rotating shaft is a knuckle that is a vehicle spring lower part suspended from the vehicle body by a suspension device (a strut described later) having a coil spring and a shock absorber. The wheel bab 3 is connected via a bearing 5j. Reference numeral 6 denotes a braking device including a brake rotor 6a attached to the wheel hub 3 and a brake caliper 6b attached to the knuckle 5. Reference numeral 7 denotes an upper arm connected to the strut 4. Reference numeral 8 denotes the knuckle 5. The lower arm 10 supports the stator 10S side, a motor case 10a supporting the stator 10S side, an output shaft 10b rotatably attached to the motor case 10a via a bearing 10j, and an output shaft 10b. An inner rotor type electric motor provided with a rotor 10R. In this example, the motor case 10a supporting the stator 10S side of the electric motor 10 is moved between the side surface on the vehicle front side and the upper side of the knuckle 5. If the motor 10 is made to function as the mass of a dynamic damper In, and a rotary shaft 3k of the output shaft 10b and the wheel hub 3 of the motor, by binding the flexible coupling 11, the motor 10 is to kill transmitting torque to the wheel 2 also swings.

  As shown in FIGS. 3A and 3B, the dynamic vibration absorber 20 includes a motor attachment member 21 attached to the side surface of the motor case 10a, a knuckle attachment member 22 attached to the knuckle 5, and the motor. A spring member 23 comprising a coil spring for connecting the attachment member 21 and the knuckle attachment member 22, a cylinder 24a and a guide shaft 24b, and two guide members 24 for guiding the operating direction of the spring member 23 in the vertical direction; 24, a hydraulic damper 25 having a cylinder 25a, a piston (not shown), and a piston rod 25b connected to the piston, arranged in parallel to the guide members 24, 24, and dust to the guide members 24, 24. And bellows-shaped boots 26 and 27 for preventing intrusion of muddy water. Provided on the upper side of the Le mounting member 22, the guide shaft 24b, it is 24b upper side is fixed to the cover portion 26a of the upper of the boot 26. The boot 27 is provided between the motor attachment member 21 and the knuckle attachment member 22.

The motor mounting member 21 includes a fixed plate 21a for fixing a lower end side of the spring member 23 and a lower end side of guide shafts 24b and 24b, which are movable portions of the guide members 24 and 24, and a lower portion of the fixed plate 21a. And leg portions 21b and 21c having curved portions 21k along the outer shape of the cross section of the motor case 10a, which are respectively provided on the end portion side and the central portion in the direction parallel to the motor shaft direction. The motor mounting member 21 side is fixed to the motor case 10a by fastening the leg portions 21b and 21c to the mounting portion 10m protruding from the outer peripheral side of the motor case 10a using fixing bolts 21m and nuts. To do.
The knuckle mounting member 22 includes a fixing member 22a that fixes the upper end side of the spring member 23 and the cylinders 24a and 24a that are fixing portions of the guide members 24 and 24, and a housing 22b that houses the fixing member 22a. And a knuckle attachment portion 22c provided on the knuckle 5 side of the housing 22b, and formed at a position corresponding to the attachment hole 5s provided on the knuckle 5 upper side of the knuckle attachment portion 22c. The fixing bolt 22m is inserted into the bolt insertion hole 22s, and the knuckle attachment member 22 is attached to the knuckle 5 using a nut.

On the other hand, a cylinder 25a, which is a fixed portion of the hydraulic damper 25, has a shaft, which is a movable portion of the damper 25, on a damper mounting portion 22d provided on the surface opposite to the knuckle mounting portion 22c of the housing 22b. The end portion of 25b is attached to a damper attachment portion 21d provided on the side opposite to the curved portion 21k of the leg portion 21c located at the center portion.
Thereby, as shown also in FIG. 4, the hydraulic damper 25 and the guide members 24, 24 can be arranged on the front side of the vehicle 30. Accordingly, the hydraulic damper 25 and the guide members 24, 24 can be effectively cooled, and the viscosity of the oil of the hydraulic damper 25 and the grease applied between the cylinder 24a and the guide shaft 24b of the guide member 24 can be reduced. Outflow can be prevented.
In this example, as shown in FIGS. 5A and 5B, the housing 22b of the dynamic vibration absorber 20 is provided with a protrusion 22q extending in the center direction of the motor case 10a, and the motor described above. A U-shaped rubber support member 10p having a stopper rubber 10q attached to the inside of the horizontal piece is attached to the case 10a so that the stopper rubber 10q and the protrusion 22q face each other with a predetermined distance therebetween. The maximum displacement width of the electric motor 10 is easily regulated, and the end of the projection 22q is fixed to the lower part of the strut 4 that suspends the knuckle 5 on the vehicle body side by the holding member 28. Yes. Thereby, since the maximum displacement width of the electric motor 10 that is floating-mounted by the dynamic vibration absorber 20 can be easily regulated, even if there is an excessive input from the road surface, the electric motor 10 is prevented from being damaged. In addition, the knuckle attachment member 22 that is a fixing portion of the dynamic vibration absorber 20 is fixed to both the knuckle 5 and the strut 4, so that the dynamic vibration absorber 20 can be stably operated.

Thus, according to this best mode, when the in-wheel motor is floating mounted below the vehicle spring, it is attached to the knuckle 5 and the motor attachment member 21 attached to the side surface of the motor case 10a of the electric motor 10. A knuckle mounting member 22, a spring member 23 connecting the motor mounting member 21 and the knuckle mounting member 22, two guide members 24 and 24 for guiding the operating direction of the spring member 23 in the vertical direction, and the guide member A dynamic vibration damping device 20 having a hydraulic damper 25 arranged in parallel with 24 and 24 is arranged on the front side surface of the electric motor 10 to couple the electric motor 10 and the knuckle 5. So, even when using an inner rotor type motor, the stroke width can be increased and the motor Mass can be stably operated as a mass of the dynamic damper.
Further, the hydraulic damper 25 and the guide members 24, 24 of the dynamic vibration absorber 20 are arranged on the front side of the vehicle so that the hydraulic damper 25 and the guide members 24, 24 can be effectively cooled. Therefore, the oil viscosity of the hydraulic damper 25 and the grease flow out of the guide member 24 can be prevented.

In the best mode, the motor mounting member 21 and the knuckle mounting member 22 are coupled by the spring member 23 and the two guide members 24, 24. As shown in FIGS. 6 (a) and 6 (b), The motor mounting member 21 and the knuckle mounting member 22 are coupled using two linear motion guides 29 with springs, in which a linear motion guide 29A composed of a linear bearing 29a and a rod 29b and a spring member 29B are integrally formed. Also good. At this time, it goes without saying that the spring member 29B is disposed only between the motor attachment member 21 and the knuckle attachment member 22. The number of the linear guide 29 with spring may be one, and the other may be the linear guide 29A. However, the constant setting of the spring member 29B is easier when the number is two.
In the above example, the motor for driving the wheel is a direct drive motor. However, as shown in FIG. 7, the present invention is an in-wheel motor that reduces the rotation of the electric motor 10 and the electric motor 10 to reduce the wheel. The present invention can also be applied to a case where a geared motor 10G provided with a reduction gear mechanism 12 for transmitting to the motor is used. In this case, as shown in the figure, the motor case 10a of the electric motor 10 may be coupled to the knuckle 5 using the dynamic vibration absorber 20 having the above-described configuration, but the motor case and the gear case are integrated. The motor housing is manufactured and the electric motor 10 and the reduction gear mechanism 12 are accommodated therein, and the side surface side of the motor housing and the knuckle 5 are configured in a dynamic manner similar to that of the dynamic vibration absorber 20. You may make it couple | bond using a vibration absorber.
Further, the present invention is not limited to the vehicle having the strut type suspension shown in FIG. 1 but can be applied to a vehicle having a suspension having another configuration such as a double wishbone type suspension.

  As described above, according to the present invention, since the hydraulic damper and the guide member used in the dynamic vibration absorber can be effectively cooled, the oil viscosity of the hydraulic damper and the grease of the guide member can be reduced. The outflow can be prevented, and the performance of the dynamic vibration absorber can be improved and stabilized.

It is a front view which shows the structure of the in-wheel motor system which concerns on the best form of this invention. It is a longitudinal cross-sectional view which shows the structure of the in-wheel motor system which concerns on this best form. It is a figure which shows the structure of the dynamic vibration damper which concerns on this best form. It is a perspective view which shows the structure of the in-wheel motor system by this invention. It is a figure which shows arrangement | positioning of a hydraulic damper and a guide member. It is a figure which shows the other structure of a dynamic vibration damper. It is a figure which shows the example which applied the dynamic vibration damper of this invention to the geared motor. 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 dynamic vibration damper. It is a figure which shows the structure of the in-wheel motor system using the conventional geared motor.

Explanation of symbols

1 tire, 2 wheel, 2a rim, 2b wheel disc,
3 wheel hub, 3k hub rotation axis, 4 struts, 4a coil spring,
4b Shock absorber, 5 knuckle, 5j bearing, 5s through hole,
6 brake device, 6a brake rotor, 6b brake caliper, 7 upper arm,
8 lower arm, 10 electric motor, 10S stator, 10R rotor,
10a motor case, 10b output shaft, 10j bearing, 10m mounting part,
10p rubber support member, 10q stopper rubber, 10G geared motor,
11 Flexible coupling, 12 Reduction gear mechanism,
20 dynamic vibration absorber, 21 motor mounting member, 21a fixing plate, 21b, 21c legs,
21d damper mounting part, 21k curved part, 21m, 22m fixing bolt,
22 knuckle mounting member, 22a fixing member, 22b housing, 22c knuckle mounting portion, 22d damper mounting portion, 22q protrusion, 22s bolt insertion hole, 23 spring member,
24 guide member, 24a cylinder, 24b guide shaft,
25 Hydraulic damper, 25a cylinder, 25b piston rod,
26,27 Bellows-shaped boots, 26a lid, 30 vehicles.

Claims (3)

  In an in-wheel motor system configured to attach a motor for driving wheels to a vehicle unsprung member via a dynamic vibration absorber and use the mass of the motor as the mass of the dynamic vibration absorber, the dynamic vibration absorber is A spring member disposed between the motor and the lower part of the vehicle spring, a hydraulic damper, and a cylinder and a guide shaft. The guide member guides the operating direction of the spring member and the hydraulic damper. An in-wheel motor system, wherein the hydraulic damper and the guide member are arranged on the front side of the vehicle.   2. The in-wheel according to claim 1, wherein the motor is a geared motor including an electric motor and a reduction gear mechanism that is connected to an output shaft of the motor and transmits the rotation to the wheel by reducing the rotation of the motor. Motor system. A motor mounting member that is mounted on a side surface of a motor case that supports the stator side of the motor and a knuckle mounting member that is mounted on a knuckle connected to a wheel portion, and the motor mounting member and the knuckle mounting member are provided. The in-wheel motor system according to claim 1, wherein the in-wheel motor system is coupled by the spring member, the hydraulic damper, and the guide member.

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