JPH11117994A - Mount device for gear box - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mount device to generate an elastic force (supporting force) corresponding to excitation torque on a gear box and high-efficiently absorb vibration on the car body side as breakage of a gear box is prevented from occurring, in a vehicle provided with an electric motor to generate a drive force for running a vehicle and a gear box for deceleration. SOLUTION: The spring characteristics of the support means 12 of a gear box 10 are set in a non-linear state such that the change factor of an elastic force increasing according to relative displacement between the car body side and the gear box 10 is low in a low displacement region and suddenly is increased in a high displacement region. Thereby, a rubber block 16 serving as the support means 12 of the gear box 10 is located between a plate 18 on the car body side and a plate 17 on the gear box side and a boring 25 is formed at the internal part of the rubber block 16. When an amount of displacement of the rubber block 16 to the elongation side exceeds a given range, the rubber block collides with the plate 17 on the gear box side. A lock part 22 with rubber is provided to elastically regulate displacement, of the rubber block to the elongation side of the rubber block 16.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a gear box mounting device.

[0002]

2. Description of the Related Art It is conceivable to configure a power transmission path as shown in FIG. 7 in a vehicle provided with an electric motor for generating a driving force for running the vehicle.

[0003] Reference numeral 1 denotes an axle of a driving wheel, and a differential 2 is interposed in an intermediate portion of the axle. An output shaft of a gear box 4 for reduction is connected to a drive pinion of the differential 2 via a propeller shaft 3.

[0004] The gear box 4 for reduction is mounted on the vehicle body side. The gear box 4 is provided with two input shafts, and an electric motor 5 is connected to each of them. 1
Gears that mesh with the same gear ratio are interposed between the two output shafts and the two input shafts.

When the electric motor 5 is supplied with power, it generates a driving force for running the vehicle. The driving force is output to the propeller shaft 3 via the gear box 4 for reduction, and transmitted from the differential 2 to the driving wheels 6 via the axle 1.

As a related prior art, a power unit including an electric motor is supported via a liquid-sealed mount bush having a variable spring constant (Japanese Patent Laid-Open No. 9-215104), and a differential of a power transmission path is omitted ( Japanese Unexamined Patent Publication No. Hei 9-215101), in which an auxiliary machine can be driven by an electric motor even while the vehicle is stopped (Japanese Unexamined Patent Publication No. Hei 5-14744).
No. 5), and the like.

[0007]

In a vehicle provided with a power transmission path as shown in FIG. 7, when a torque fluctuation occurs in the rotation of the electric motor 5, torsional vibrations are generated on the output shaft of the gear box 4 and the road surface is also damaged. When torque fluctuations occur in the rotation of the drive wheels 6 (tires) due to irregularities or the like, torsional vibration is input from the axle 1 to the gear box 4. When the axle 1 moves up and down, the propeller shaft swings,
The gear box 10 is caused to swing back and forth by the acting force in the axial direction. Therefore, the transmission of these vibrations to the vehicle body not only impairs the comfortable riding comfort of the vehicle, but also may cause damage to the gear box 4 and the like when a large fluctuation torque or the like is input.

An object of the present invention is to provide an effective countermeasure for solving such a problem.

[0009]

According to a first aspect of the present invention, there is provided a motor provided with a motor for generating driving force for running the vehicle and a gearbox for reducing the speed of the motor, the means for elastically supporting the gearbox on the vehicle body side. The spring characteristic is set to be non-linear such that the rate of change of the elastic force, which increases according to the relative displacement between the vehicle body side and the gear box, is small in the small displacement region and rises rapidly in the large displacement region.

[0010] In the second invention, a rubber block is interposed between the plate on the vehicle body side and the plate on the gear box side as support means for the gear box in the first invention,
A curd is formed inside the rubber.

In a third aspect based on the second aspect, when the amount of displacement of the rubber block toward the extension side exceeds a predetermined range, the rubber block abuts against the plate on the gear box side, and the displacement of the rubber block toward the extension side is elastically controlled. Provide a locking part with rubber to regulate.

In a fourth aspect based on the second aspect, when the amount of displacement of the rubber block in the gear box axial direction exceeds a predetermined range, the rubber block abuts on the plate on the gear box side,
A locking portion with rubber is provided to elastically restrict the displacement in the gear box axial direction.

[0013]

According to the first aspect of the present invention, when the vibration torque applied to the gear box is small, the gear box supporting means can softly support the vibration torque and can favorably absorb the vibration transmitted to the vehicle body due to its elasticity. Further, when the vibration torque applied to the gear box is increased, a large supporting force (elastic force) corresponding to the torque is obtained, and the vibration to the vehicle body can be sufficiently absorbed while preventing the gear box and the like from being damaged.

According to the second aspect of the present invention, by forming a curb inside the rubber block, the non-linearity is such that the rate of change of the elastic force is small in the small displacement region and suddenly rises in the large displacement region upon operation on the contraction side. Spring characteristics can be provided at low cost.

In the third aspect of the present invention, the non-linear spring characteristic such that the rate of change of the elastic force in the extension side operation is small in the small displacement region and rapidly rises in the large displacement region is reduced by the locking portion with rubber. Can be given at cost.

According to the fourth aspect of the present invention, even if the gearbox is displaced in the front-rear direction due to the acting force in the gearbox axial direction accompanying the swinging of the propeller shaft, if the displacement exceeds a predetermined range, It is elastically regulated by the locking part with rubber. In this case, for the operation of the gear box in the front-rear direction, a non-linear spring characteristic such that the rate of change of the elastic force is small in the small displacement region and suddenly rises in the large displacement region by the locking portion with rubber is low cost. Can be given.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIGS. 1 to 5, reference numeral 10 denotes a reduction gear box, and a motor 11 is connected to two input shafts. The gearbox 10 has a side mount 12 that supports both sides in a direction (vehicle width direction) perpendicular to the output shaft 15 at the same height as the output shaft, and a center that supports the rear motor coaxially with the output shaft. It is mounted on the vehicle body via the mount 13.

The side mount 12 is a rubber block 16
Plates 17 and 18 (metal plates) are adhered to the upper and lower surfaces of the vehicle, and are connected to the vehicle body side by bolts and nuts via the lower plate 18. Brackets 19 are connected to both sides of the gear box 10 with bolts and nuts, respectively.
A mounting surface 20 having substantially the same height as the output shaft is formed on each bracket 19. The side mount 12 is connected to the mounting surface 20 via the upper plate 17 with bolts and nuts.

Both ends 21 of the lower plate 18 rise up and down before and after the rubber block 16 and the upper plate 1
A locking portion 22 that bends inward is formed at the tip that extends upward from 7. Rubber 23 is provided on the inner surface of both ends 21,
The rubber 24 is bonded to the inner surface of the. Rubber block 16
Is provided with a hole 25 (hole) for adjusting the spring characteristics.

The center mount 13 is an outer cylinder 26 (color)
Rubber bush 28 between the inner cylinder 27 (bearing metal)
It is attached to the vehicle body side with bolts and nuts via a bracket 29 that encloses the collar 26 together with a lower support at the center of the U-shape.

A pin 30 is attached to the inner cylinder 27 of the rubber bush 28.
The pin 30 is rotatably inserted, and the pin 30 is coaxially fixed to the output shaft 15 via a frustoconical stay 31 at the center of the rear surface of the gear box 10 (between the electric motors 11). Numeral 32 denotes a nut for preventing the pin 30 from coming off.
Of the pin 30 protruding from the inner cylinder 27 (male thread portion)
To join.

FIG. 6 shows the spring characteristics with respect to the vertical expansion and contraction (stroke) of the side mount 12. On the contraction side, the elastic force (supporting force) is small and gradually rises until the curl 25 of the rubber block 16 is crushed in accordance with the stroke. On the other hand, when the curl 25 is crushed, the elastic force suddenly increases from that point. become. On the extension side, the elastic force is small and rises gently at the corner 25 of the rubber block 16 according to the stroke, while the upper plate 17
Abuts against the rubber 24 of the locking portion 22, the rubber 24
, The elastic force of the entire side mount rises sharply.

With this configuration, the gear box 10
The weight of the motor 11 is supported at the same height at three points on a plane including the output shaft 15 of the gear box 10 via the side mount 12 and the center mount 13. When the electric motor 11 is driven, the driving force is transmitted to the gear box 10.
And transmitted to the drive wheels via the axle from the differential (see FIG. 7).

When a torque fluctuation occurs in the rotation of the electric motor 11 or the rotation of the drive wheels, a torsional torque is generated in the output shaft 15 of the gear box 10, and both sides of the gear box 10 vibrate in the roll direction. This vibration (torque) is mainly supported by side mounts 12 located on both sides of the gear box 10.

Although each side mount 12 expands and contracts up and down, a plane s (mount support surface) including the output shaft 15 of the gear box 10 swings around the output shaft 15 in the roll direction. Therefore, induction of coupled vibration in which the output shaft 15 swings left and right due to the fluctuation torque that swings up and down on both sides of the gear box 10 can be suppressed.

Although the center mount 13 also receives a slight torque (vibration), the center mount 13 is coaxial with the output shaft 15 of the gear box 10 (the mount support surface s due to expansion and contraction of the side mount 12).
(The center of swing in the roll direction) is rotatably supported, so that coupled vibration in which the output shaft 15 swings left and right can be effectively suppressed.

Since the side mount 12 has a mount characteristic as shown in FIG. 6, when the fluctuation torque that swings both sides of the gear box 10 in the roll direction is small, the side mount 12 is softly supported and transmitted to the vehicle body by the elasticity of the rubber 16. Vibration is well absorbed. When the fluctuation torque increases, a large supporting force (elastic force) corresponding to the fluctuation torque is obtained, and the rubber 1
Vibration toward the vehicle body can be sufficiently absorbed by the elasticity of 6,24.

When the axle moves up and down, the gear box 10 swings back and forth due to the axial force accompanying the swinging of the propeller shaft (see FIG. 7). In the side mounts 12 on both sides, when the upper plate 17 is displaced back and forth, it strikes both ends 21 of the lower plate 18,
The swinging of the gear box 10 back and forth is also reduced.
In addition, the collision between the plates 17 and 18 is reduced by the rubbers 23 at both ends 21, and the generation of impact noise can be prevented.

As a result, the vibration transmitted from the gear box 10 to the vehicle body is suppressed to a low level via the side mount 12 and the center mount 13, so that the gear box 10 and the like can be prevented from being damaged, and a comfortable ride of the vehicle can be achieved. Can be secured. In the side mount 12,
FIG. 6 shows a simple and easy means of providing the rubber block 16 and the locking portion 22 with the rubber 24.
A desirable non-linear spring characteristic as described above can be set at low cost.

[Brief description of the drawings]

FIG. 1 is a front view of a partially cutaway showing an embodiment of the present invention.

FIG. 2 is a right side view of the same.

FIG. 3 is a plan view of the same.

FIG. 4 is an explanatory perspective view of the same.

FIG. 5 is an enlarged view of the same side mount.

FIG. 6 is a characteristic diagram of the side mount.

FIG. 7 is an explanatory diagram of a configuration of a power transmission path.

[Explanation of symbols]

 Reference Signs List 10 Gear box 11 Electric motor 12 Side mount 13 Center mount 15 Output shaft 16 Rubber block 17 Upper plate 18 Lower plate 19 Bracket 23, 24 Rubber 26 Outer cylinder 27 Inner cylinder 28 Rubber bush 29 Bracket 30 Pin

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yuji Kusara Nissan Diesel Kogyo Co., Ltd. (72) Inventor Toshihiko Abe Nissan Diesel Kogyo Inside the corporation

Claims (4)

[Claims] In a vehicle provided with an electric motor for generating a driving force for running the vehicle and a gearbox for reducing the speed, a spring characteristic of means for elastically supporting the gearbox on the vehicle body side is determined by comparing the spring characteristics of the vehicle body side with the gearbox. A gear box mounting device characterized in that the rate of change of the elastic force, which increases in accordance with the relative displacement with respect to the small displacement region, is set to be non-linear so that it rises sharply in the large displacement region. 2. A gear box supporting means, wherein a rubber block is interposed between a plate on the vehicle body side and a plate on the gear box side, and a rubber is formed inside the rubber. The mounting device as described. 3. When the amount of displacement of the rubber block toward the extension side exceeds a predetermined range, the rubber block abuts against a plate on the gear box side, and a locking portion with rubber is provided for elastically restricting the displacement of the rubber block toward the extension side. 3. The method according to claim 2, wherein
4. The mounting device according to claim 1. 4. When the amount of displacement of the rubber block in the axial direction of the gear box exceeds a predetermined range, the rubber block abuts against a plate on the gear box side and elastically restricts the displacement in the axial direction of the gear box. The mounting device according to claim 2, further comprising: