JP2008128393A - Tire coupling and in-wheel motor system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tire coupling, capable of efficiently transmitting a driving-side torque to a driven side while effectively suppressing deformation of a tire. <P>SOLUTION: A rubber tire 13 constituting the tire coupling 10 is filled with a viscous fluid 16. A first flange 11 connected to a driving shaft 11J includes a first cylindrical barrier wall 17 protruded into the rubber tire 13, and a second flange 12 connected to a driven shaft 12J includes a second barrier wall 18 having an inside diameter larger than the outside diameter of the first barrier wall 17. The top end of the first barrier wall 17 is extended to the inside of the second barrier wall 18 to form an orifice 19 between the first and second barrier walls 17 and 18. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a rotational force transmission mechanism, and in particular, even when an eccentricity or the like occurs between a driving side and a driven side, the driving side rotational force can be transmitted smoothly and efficiently. It relates to tire coupling.

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 suspension part via the dynamic vibration absorber 30 as shown in FIG. (For example, refer to Patent Document 1).
The in-wheel motor system includes a rotation-side case 3b with a motor rotor 3R attached to the inner side in the radial direction, a concentric circle with the rotation-side case 3b, and a motor spaced apart from the motor rotor 3R by a predetermined distance. A hollow direct drive motor (in-wheel motor) 3 and a vehicle unsprung part in which a stator 3S is attached and a non-rotating side case 3a whose outer side in the radial direction is opened are rotatably connected via a bearing 3j. The knuckle 5 is connected to the motor-side plate 31 attached to the non-rotating side case 3a, the knuckle-side plate 32 connected to the knuckle 5 that is an undercarriage part of the vehicle, and the plates 31 and 32. A linear guide 33 with a spring in which a moving guide 33A and a spring member 33B are integrally formed, and the linear guide with a spring 3 is connected by a dynamic vibration absorber 30 including a second linear motion guide 34 and a damper 35 disposed in parallel with each other, and the rotating case 3b and the wheel 2 on which the tire 1 is mounted are connected to the wheel. 2 is coupled by a flexible coupling 40 that is a driving force transmission mechanism that can be eccentric to each other in the radial direction, whereby the motor side plate 31 and the knuckle side plate 32 are guided in the vehicle vertical direction, The in-wheel motor 3 can be swung only in the vertical direction because it is coupled by the linear guide 33 with spring and the damper 35.
Specifically, as shown in FIG. 4B, the flexible coupling 40 includes a plurality of hollow disc-shaped plates 41A to 41C and the adjacent plates 41A and 41B and the plates 41B and 41C. The in-wheel motor 3 is connected to the linear guides 42A, 42B, and the linear guides 42A, 42B for guiding the adjacent plates 41A, 41B and the plates 41B, 41C in the radial direction of the disk. 42B, the drive torque from the in-wheel motor 3 can be efficiently transmitted to the wheel 2 in a configuration that can swing along the operating direction of the disk, that is, the radial direction of the disk, but not in the rotational direction. It is something that can be done.

FIG. 5A shows an in-rotor type electric motor in which the in-wheel motor elastically supported to the undercarriage parts of the vehicle via the dynamic vibration absorber 60 proposed by the present applicant is an inner rotor type electric motor. FIG. 6 is a diagram showing an example of the configuration of an in-wheel motor system in a certain case. In this in-wheel motor system, a motor case 50a of an electric motor 50M and a knuckle 5 as a vehicle unsprung part are attached to a guide fixing member 61 Further, two linear motion guides 62 and 62 with springs having the same configuration as the linear motion guide 33 with springs, and a damper (not shown) arranged in parallel with the linear motion guides 62 and 62 with springs are provided. While elastically supporting using the dynamic vibration absorber 60, the output shaft 50b of the motor 50M and the rotating shaft 4k of the wheel hub 4 connected to the wheel 2 are flexible. By coupling by Ppuringu 70, so that it is possible to the motor 50M to transmit the rotational force to the wheel 2 also swings (Japanese Patent Application No. 2006-26385).
As the flexible coupling 70, for example, an Oldham coupling 70Z that can move in the eccentricity, declination, and sliding directions as shown in FIG. 5B can be used (see, for example, Patent Document 2). . The Oldham coupling 70 includes a hollow cylindrical driving shaft member 72 attached to the end of the driving shaft 71, a hollow cylindrical driven shaft member 74 attached to the end of the driven shaft 73, and the driving shaft member 71. And a driven shaft member 74. The driven shaft member 74 is provided with a pair of first guide members 72m and 72n made of metal at the driven side end of the driven shaft member 72. A pair of metal second guide members 74m and 74n orthogonal to the first guide members 72m and 72n are provided at the driving side end portions of the rotation force transmission member 75, and the outer peripheral portion of the support 75K of the rotational force transmission member 75 is provided with the first guide members 72m and 74n. Plastic first slide members 75a and 72b slidably provided on the inner surfaces of the first guide members 72m and 72n, and plastics slidably provided on the second guide members 74m and 74n. The second slide members 75c and 72d are provided, so that the driving shaft member 71 and the driven shaft member 74 are connected so as to be linearly movable up, down, left, or right. Even when an eccentricity or declination occurs between the driving shaft 71 and the driven shaft 71, the rotational force can be reliably transmitted.
WO 02/083446 A1 JP-A-9-269013

However, since the flexible coupling 40 and the Oldham coupling 70 require high assembly accuracy, not only the assembly work takes time, but the dynamic damper type in-wheel motor system does not swing between the shafts. Because of its large size, if there is an angle between the shafts due to misalignment, etc., the sliding resistance increases, and the movement along the guides of the motors 3 and 50M deteriorates, so the power transmission efficiency only decreases. In addition, there is a problem that the dynamic damper performance by the dynamic vibration absorbers 30 and 60 is hindered.
On the other hand, as a joint used in a place where vibration is intense, a rubber tire 83 is conventionally provided with a first flange 81 connected to a driving shaft 81J and a second flange 82 connected to a driven shaft 82J as shown in FIG. (For example, Japanese Utility Model Laid-Open No. 57-35518, Japanese Patent Application Laid-Open No. 2005-279671, etc.), the tire coupling 80 may be used when the swing is large. The rubber tire 83 is greatly deformed, and therefore, there is a problem that the power transmission efficiency is greatly reduced.
Further, since the rubber tire 83 is only filled with a gas such as air, when the deformation is large, wrinkles with stress concentrated on the surface of the rubber tire 83 can be formed, but when such deformation is repeated, There is a risk that the durability of the tire coupling 80 may be impaired due to cracks in the ridge portion.

  The present invention has been made in view of the conventional problems. A tire coupling that can effectively suppress deformation of the tire and efficiently transmit the torque on the driving side to the driven side, and the tire cup. An object is to provide an in-wheel motor system including a ring.

The invention according to claim 1 of the present application is a tire coupling in which a driving side plate rotating on the same axis as the driving side and a driven side plate rotating on the same axis as the driven side are connected by a rubber tire. The tire is filled with a viscous fluid, and a partition wall protruding inside the tire is provided on one or both of the inner wall side of the tire and the tire inner side of the plate.
According to a second aspect of the present invention, in the tire coupling according to the first aspect, the partition wall is provided in both the driving side plate and the driven side plate, and a passage through which the fluid can flow is formed between the partition walls. It is a thing.
According to a third aspect of the present invention, in the tire coupling according to the first aspect, the inside of the tire is divided into a plurality of rooms by the partition wall, and a passage through which the fluid can flow is provided in the partition wall. It is.

According to a fourth aspect of the present invention, a motor for driving a wheel is attached to a vehicle unsprung member via a dynamic vibration damping device including a spring element and a damper element, and the mass of the motor is set to the dynamic vibration damping device. In an in-wheel motor system configured to be used as a mass, the motor and a wheel or a hub are connected using the tire coupling according to any one of claims 1 to 3.
As the in-wheel motor system, an in-wheel motor as shown in FIG. 4A is an annular motor rotor and an annular motor rotor disposed at a predetermined interval on the radially inner side of the motor rotor. A hollow in-wheel motor including a motor stator and an annular non-rotating side case that accommodates the motor stator, and the non-rotating side case of the in-wheel motor includes a spring element and a damper element. Or the motor is an inner rotor type electric motor as shown in FIG. 5A, and the motor case supporting the stator side of the electric motor and the knuckle are spring-loaded. An in-wheel motor system configured to be connected using a buffer mechanism including an element and a damper element can be given. Moreover, as an in-wheel motor, you may use the geared motor provided with the reduction gear mechanism which decelerates the rotation of this electric motor and this electric motor, and transmits to a wheel. Also in this case, the motor case, the knuckle, and the buffer mechanism of the electric motor may be connected.

According to the present invention, in the tire coupling in which the driving side plate and the driven side plate are connected by the rubber tire, the rubber tire is filled with the viscous fluid, and either the inner wall side of the tire or the tire inner side of the plate Since one or both of them are provided with a partition wall protruding inside the tire, deformation of the rubber tire can be suppressed, and the torque on the driving side can be efficiently transmitted to the driven side, and the viscous fluid Therefore, the swinging effect inputted to the driving side or the driven side can be sufficiently suppressed.
At this time, the partition wall is provided on both the driving side plate and the driven side plate, a passage through which the fluid can flow is formed between the partition walls, and the inside of the tire is divided into a plurality of rooms by the partition wall, If a passage through which the fluid can flow is provided in the partition wall, the damping effect can be more effectively exhibited.
Further, the tire coupling of the present invention is attached to a vehicle spring lower member through a dynamic vibration absorber having a spring element and a damper element, and a motor for driving a wheel is attached, and the mass of the motor is set to the dynamic vibration absorber. If it is applied to an in-wheel motor system configured to be used as the mass of the motor, the torque of the motor can be reliably transmitted to the wheel even when there is an eccentricity or a declination. In addition, since the tire coupling of the present invention has a damping effect, the damper element of the dynamic vibration absorber of the in-wheel motor can be downsized or omitted.

Hereinafter, the best mode of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram showing a configuration of a tire coupling 10 according to the best mode, in which 11 is a first flange connected to a driving shaft 11J, 12 is a second flange connected to a driven shaft 12J, and Is a rubber tire, and the rubber tire 13 is attached to the two flanges 11 and 12 by fixing brackets 14 and presser bolts 15, respectively. Reference numeral 16 denotes a viscous fluid filled in the rubber tire 13, and 17 and 18 denote cylindrical partition walls attached to the inside of the tire of the first and second flanges 11 and 12, respectively. In this example, the outer diameter of the partition wall 17 (hereinafter referred to as the first partition wall) 17 attached to the first flange 11 is set to the partition wall (hereinafter referred to as the second partition wall) 18 attached to the second flange 12. The tip end of the first partition wall 17 extends to the inside of the second partition wall 18. Thereby, a narrow passage (orifice) 19 through which the viscous fluid 16 flows is formed between the first partition wall 17 and the second partition wall 18.

In this manner, the rubber tire 13 constituting the tire coupling 10 is filled with the viscous fluid 16 and the first and second flanges 11 and 12 are provided with the cylindrical partition walls 17 and 18 protruding into the rubber tire 13. By doing so, even when a large swing is input to the driving shaft 11J or the driven shaft 12J, not only the swing can be suppressed by the damping effect of the viscous fluid 16, but also the deformation of the rubber tire 13 is reduced. The torque on the driving side can be efficiently transmitted to the driven side, and stress concentration on the surface of the rubber tire 13 can be prevented, so that the durability of the tire coupling 10 can be improved.
In this example, the outer diameter of the first partition wall 17 is made smaller than the inner diameter of the second partition wall 18, and the tip of the first partition wall 17 is extended to the inside of the second partition wall 18. In addition, since the damping effect of the viscous fluid 16 is further enhanced by forming the orifice 19 between the first and second partition walls 17 and 18, the power transmission efficiency can be further enhanced. .

  Further, the flexible coupling 40 of the in-wheel motor system shown in FIGS. 4 (a) and 4 (b) or the flexible coupling 70Z of the in-wheel motor system shown in FIGS. 5 (a) and 5 (b). Instead, if the tire coupling 10 is used, not only can the torque of the in-wheel motor 3, 50 </ b> M be reliably transmitted to the wheel 2 even when there is an eccentricity or declination, the dynamic vibration absorber 30, Since the 60 damper elements can be reduced in size or omitted, the in-wheel motor system can be reduced in size and weight.

In the best mode, the outer diameter of the first partition wall 17 is smaller than the inner diameter of the second partition wall 18, but the same size as shown in FIGS. 2 (a) and 2 (b). The first partition wall 17A and the second partition wall 18A are attached while being shifted in the tire radial direction, and a cut portion 17k is provided on the side surface side of the first partition wall 17A, and the second partition wall 18A is provided in the cut portion 17k. You may make it insert. In the tire coupling 10A having such a configuration, the gap between the first partition 17A and the second partition 18A formed in the cut portion 17k serves as the orifice 19k.
Further, as shown in FIG. 3, a partition wall 20 that divides the inside of the tire into a plurality of rooms is provided inside the rubber tire 13, and a plurality of orifices 21 through which the viscous fluid 16 can flow are provided in the partition wall 20. Even if it does in this way, the same effect can be acquired. When the distance between the axes is long, the lengths of the first and second partition walls 17 and 18 are increased, and the tip portions of the partition walls 17 and 18 are likely to swing. It is more effective to use the tire coupling 10B having the configuration as shown in FIG.

  As described above, according to the present invention, it is possible to obtain a tire coupling that can effectively suppress the deformation of the tire and efficiently transmit the torque on the driving side to the driven side. By applying this flexible coupling to the in-wheel motor system, it is possible not only to transmit the torque of the in-wheel motor to the wheel even when there is eccentricity or declination, but also the damper element of the dynamic vibration absorber Can be reduced in size or omitted, so that the in-wheel motor system can be reduced in size and weight.

1 is a longitudinal sectional view showing a configuration of a tire coupling according to the best mode of the present invention. It is principal part sectional drawing of the tire coupling which concerns on this best form. It is a figure which shows the other structure of the tire coupling by this invention. It is a figure which shows the structure of the in-wheel motor system provided with the conventional hollow motor. It is a figure which shows the structure of the in-wheel motor system provided with the inner-rotor type electric motor. It is a figure which shows the structure of the conventional tire coupling.

Explanation of symbols

10 tire coupling, 11 first flange, 11J driving shaft,
12 second flange, 12J driven shaft, 13 rubber tire,
14 fixing bracket, 15 presser bolt, 16 viscous fluid,
17, 18 Cylindrical partition, 19 orifices.

Claims (4)

  In a tire coupling in which a driving side plate rotating on the same axis as the driving side and a driven side plate rotating on the same axis as the driven side are connected by a rubber tire, the tire is filled with a viscous fluid, A tire coupling, wherein a partition wall protruding into the tire is provided on one or both of the inner wall side of the tire and the tire inner side of the plate.   The tire coupling according to claim 1, wherein the partition wall is provided on both the driving side plate and the driven side plate, and a passage through which the fluid can flow is formed between the partition walls.   2. The tire coupling according to claim 1, wherein the inside of the tire is divided into a plurality of chambers by the partition wall, and a passage through which the fluid can flow is provided in the partition wall.   An in-wheel motor having a configuration in which a motor for driving a wheel is attached to a vehicle unsprung member via a dynamic vibration absorber having a spring element and a damper element, and the mass of the motor is used as the mass of the dynamic vibration absorber. In the system, the said motor and the wheel or the hub were connected using the tire coupling of Claims 1-3, The in-wheel motor system characterized by the above-mentioned.

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