JP2006002908A - Torque rod - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a torque rod having higher vibration absorbing performance than a torque rod which has a pair of torque rod bushes at both ends of a rod for giving more ride comfort to occupants. <P>SOLUTION: At one end of the rod 4 arranged in the longitudinal direction of a vehicle body, an engine side torque rod bush 5 is provided to be connected to an engine side. At the other end of the rod 4, a vehicle body side torque rod bush 6 is provided to be connected to a vehicle body side. In the torque rod 1, rolling-direction vibration generated on the engine side is therefore converted into vibration in the longitudinal direction of the vehicle body to actualize vibration absorption. At the middle position of the rod 4, a middle torque rod bush 7 is provided to be connected to a tire side for converting drive reactive vibration from a tire into vibration in the longitudinal direction of the vehicle body. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a torque rod used as an anti-vibration device for an engine in a vehicle such as an automobile.

  Conventionally, a mount system in which vibration in the roll direction of an engine is converted into vibration in the longitudinal direction of the vehicle body by means of a torque rod to prevent vibrations has a structure in which the torque rod has a pair of torque rod bushes at both ends of the rod (one torque rod bush is Since the other torque rod bush is connected to the vehicle body side), vibration in the roll direction of the engine is prevented at one torque rod (see Patent Document 1). In this case, there is an advantage that the structure of the torque rod is relatively simple and not costly. However, when a driving reaction force (anti-torque) is input from the tire due to a sudden start of the vehicle, the driving reaction force vibration is Cannot be received in the direction. Therefore, in this case, there is a problem that the ride comfort is deteriorated for the passenger because sufficient vibration isolation is not performed.

  Further, if the spring constant of the rubber-like elastic body provided in the torque rod bush is set low to improve the NV characteristic (vibration noise characteristic) at the time of engine idling, the engine when the engine posture changes due to the driving reaction force from the tire. The vibration width increases. Therefore, it takes a long time for the vibration to converge, and the ride comfort is deteriorated. On the other hand, if the spring constant of the rubber-like elastic body is set high to prevent this, vibration during idling cannot be reduced, and the riding comfort is also deteriorated.

  Also, if the spring constant of the rubber-like elastic body provided in the torque rod bush is set low, the vibration will not only occur when the driving reaction force is input from the tire but also when the engine attitude changes greatly, that is, when large amplitude vibration is input. It takes a long time to converge, and the ride comfort becomes worse. On the other hand, if the spring constant of the rubber-like elastic body is set high to prevent this, small amplitude vibration such as idle vibration cannot be reduced, and the riding comfort is also deteriorated.

  Furthermore, for example, when the vehicle passes through the unevenness of the road surface, the engine greatly sways in the longitudinal direction of the vehicle body, and this large sway cannot be sufficiently absorbed by the conventional torque rod. Therefore, the engine shake is transmitted to the vehicle body via the torque rod, so that the ride comfort is also deteriorated.

JP-A-8-74933

  In view of the above points, the present invention can improve the vibration isolation performance compared with a torque rod having a conventional structure in which a pair of torque rod bushes are provided at both ends of the rod, thereby improving the ride comfort for the passenger. An object of the present invention is to provide a torque rod that can be used.

  In order to achieve the above object, a torque rod according to claim 1 of the present invention is provided with an engine-side torque rod bush connected to the engine side at one end of a rod arranged in the front-rear direction of the vehicle body. A torque rod bushing connected to the vehicle body side at the end is provided, and a torque rod that converts vibration in the roll direction generated on the engine side into vibration in the vehicle longitudinal direction to provide vibration isolation. An intermediate torque rod bush that is connected to the side and converts driving reaction force vibration from the tire into vehicle body longitudinal vibration is provided.

  A torque rod bush according to claim 2 of the present invention is provided with an engine side torque rod bush connected to the engine side at one end of a rod arranged in the longitudinal direction of the vehicle body and at the other end of the rod on the vehicle body side. A torque rod bush connected to the vehicle body, which converts vibration in the roll direction generated on the engine side into vibration in the longitudinal direction of the vehicle body for vibration isolation, wherein the engine side torque rod bush is one end of the rod An outer cylinder connected to the inner cylinder, a first rubber-like elastic body connected to the inner peripheral side of the outer cylinder, an annular recess provided on the inner peripheral surface of the first rubber-like elastic body, and an engine side A disk-like actuating member loosely inserted in the annular recess, and a second rubber-like elastic body interposed between the actuating member and the first rubber-like elastic body, and the first rubber-like elastic body Is Comparatively set to a high spring constant, the second rubber-like elastic body is characterized in that it is set to a relatively low spring constant.

  According to a third aspect of the present invention, there is provided a torque rod having an engine side torque rod bush connected to the engine side at one end of a rod arranged in the front-rear direction of the vehicle body and a vehicle body side at the other end of the rod. A torque rod bush connected to the vehicle body is provided, and a vibration in the roll direction generated on the engine side is converted into a vibration in the vehicle longitudinal direction to provide vibration isolation. The engine side torque rod bush is connected to one end of the rod. A connected outer cylinder, a first rubber-like elastic body connected to the inner peripheral side of the outer cylinder, a second rubber-like elastic body connected to the inner peripheral side of the first rubber-like elastic body, and an engine And a rod-like actuating member that is loosely inserted on the inner peripheral side of the second rubber-like elastic body, the first rubber-like elastic body is set to a relatively high spring constant, and the second rubber Elastic body is ratio And it is characterized in that it is set to target a low spring constant.

  Furthermore, the torque rod according to claim 4 of the present invention is provided with an engine side torque rod bush connected to the engine side at one end of the rod arranged in the front-rear direction of the vehicle body, and at the vehicle body side at the other end of the rod. A torque rod bush connected to the vehicle body is provided to convert vibration in the roll direction generated on the engine side into vibration in the longitudinal direction of the vehicle body for vibration isolation. The vehicle body side torque rod bush is fixed to the vehicle body side. Case, a rubber-like elastic body connected to the inner peripheral side of the case, a boss part connected to the inner peripheral side of the rubber-like elastic body, and a screw provided on the inner peripheral surface of the boss part And the screw-like engaging portion engages with the screw-like engaging portion provided corresponding to the outer peripheral surface of the rod inserted into the inner periphery of the boss portion so as to be relatively displaceable. , Characterized in that it is intended to convert the axial displacement of the rod in the axial displacement and rotational displacement of the boss portion.

  The present invention has the following effects.

  That is, in the torque rod according to the first aspect of the present invention having the above-described configuration, when driving reaction force vibration is input from the tire during traveling of the vehicle, the driving reaction force vibration is converted into vehicle body longitudinal vibration by the intermediate torque rod bush. Is done. Therefore, in order to realize a state in which the roll direction vibration generated on the engine side is converted into the vehicle body longitudinal vibration by the engine side torque rod bush, the driving reaction force vibration from the tire is applied to the torque rod. It can be effectively reduced. Therefore, the anti-vibration performance of the torque rod can be improved as expected, and the ride quality can be improved.

  In the torque rod according to claim 2 of the present invention, the second rubber-like elastic body set to a relatively low spring operates in response to idle vibration with a relatively small amplitude, and is set to a relatively high spring. The first rubber-like elastic body thus actuated responds to driving reaction force vibration from a tire having a relatively large amplitude. Therefore, in order for the plurality of elastic bodies made up of the first and second rubber-like elastic bodies set to have different spring constants to operate in a suitable manner, the idle vibration and the driving reaction force vibration are each effective. Can be reduced. Therefore, the anti-vibration performance of the torque rod can be improved as expected, and the ride quality can be improved.

  In the torque rod according to claim 3 of the present invention, the second rubber-like elastic body set to a relatively low spring operates in response to small amplitude vibration such as idle vibration and is set to a relatively high spring. In addition, the first rubber-like elastic body operates in response to a large change in the engine posture, that is, a large amplitude vibration that occurs when suddenly starting or braking. Therefore, since a plurality of elastic bodies composed of the first and second rubber-like elastic bodies set to have different spring constants operate in a suitable manner, small amplitude vibration and large amplitude vibration are effectively reduced respectively. Can be made. Therefore, the anti-vibration performance of the torque rod can be improved as expected, and the ride quality can be improved.

  In the torque rod according to the fourth aspect of the present invention, for example, when the engine is greatly shaken in the front-rear direction due to the passage of unevenness on the road surface when the vehicle is running, the large shake is caused by the vehicle side torque via the engine side torque rod bush and the rod. Although it is transmitted to the rod bush, a structure that converts the axial displacement of the rod into the axial displacement and rotational displacement of the boss part is adopted, so that large shaking is dispersed in the axial direction and the rotational direction, resulting in The axial displacement amount (amplitude) becomes small. Therefore, it is only necessary to absorb the reduced axial displacement by the vehicle body side torque rod bush, and therefore, large shaking can be effectively reduced. Therefore, the vibration isolating performance of the torque rod can be improved and the riding comfort can be improved.

  The present application includes the following embodiments.

Claim 1 related ...
(1) Provide two bushes on the engine side of the torque rod, one under the roll vibration of the engine (under the engine) and one under the driving reaction force vibration (anti-torque vibration) from the tire (gearbox) (Below).
(2) Install a torque rod bush (engine-side torque rod bush) under vibration in the roll direction of the engine (under the engine), and under drive reaction force vibration (anti-torque vibration) from the tire (under the gear box) A torque rod bush (intermediate torque rod bush) is also installed. The engine side torque rod bush and the intermediate torque rod bush are connected by a metal rod (rod), and the intermediate torque rod bush and the vehicle body side torque rod bush are also connected by a metal rod (rod). The vehicle body side torque rod bush is fastened to the vehicle body frame by a central sleeve. The engine-side torque rod bush functions when receiving engine roll vibration, and the intermediate torque rod bush functions when receiving driving reaction force from the tire. Further, when receiving the reaction force of the tire, the transmission of vibration from the engine side torque rod bush to the rod is disconnected by rotating the cam. That is, when the driving reaction force from the tire exceeds a certain level, the clutch mechanism operates to disconnect the vibration transmission from the engine-side torque rod bush to the rod, and only transmits the vibration from the intermediate torque rod bush to the rod. As an example of the clutch mechanism, the cam position is electrically controlled by sensing the attitude of the engine with a sensor.
(3) According to the above configuration, the engine-side torque rod bush efficiently converts engine roll vibration, and the intermediate torque rod bush converts the driving reaction force vibration from the tire into the longitudinal vibration. introduce. When the intermediate torque rod bushing is operating (when driving reaction force is received from the tire), vibration transmission from the engine side torque rod bushing to the rod is disconnected. By disposing the torque rod bush under each roll vibration, the roll vibration can be almost certainly converted into the longitudinal vibration and transmitted to the vehicle body side torque rod bush. Thereby, two different roll vibrations can each be efficiently converted into the longitudinal vibration. Therefore, it is possible to limit the input vibration to the vehicle body side torque rod bush in the vehicle front-rear direction, thereby effectively reducing the input vibration.

Claim 2 related ...
(1) When the bushing characteristics on the torque rod / engine side are such that the engine vibration is parallel to the torque rod axis direction, the disk inside is supported only by the second rubber-like elastic body, resulting in a low spring state. In addition, the bushing characteristics on the torque rod / engine side indicate that when the engine vibration is input obliquely with respect to the torque rod axis direction, the disk inside is restrained by the first rubber-like elastic body (stopper structure), and the high spring state Become.
(2) The rubber shape of the torque rod / engine-side bush and the disk embedded therein are used to set the low spring state in the idle state (the second elastic body operates). Further, from the above shape, when the driving reaction force is input from the tire (acceleration / deceleration), when the engine posture is changed, the disk inside the bush is tilted and the first elastic body of the high spring is operated.
(3) In the idle state, transmission of engine longitudinal vibration to the vehicle body is reduced. Further, when the driving reaction force from the tire is large, such as in an acceleration state, the engine posture changes, so that the engine vibration is transmitted from the torque rod / engine side bush to the torque rod and is attenuated by the torque rod / body side bush.
(4) With the above configuration, a low spring (second elastic body) is used in an idle state and a cruise state in which the change in the engine posture is small, and the transmission of engine longitudinal vibration to the vehicle body is reduced. Also, when the driving reaction force (acceleration, sudden engine braking, traveling on an uphill road, etc.) from a tire whose engine posture changes is large, a high spring (first elastic body) is used, and vibration is applied to the torque rod bush on the vehicle body side. Communicate and decay.

Related to claim 3
(1) The shape of the torque rod bush on the engine side is a structure composed of a space, an elastic body (low spring, second elastic body) and an elastic body (high spring, first elastic body).
(2) By changing the structure of the engine-side bush to a space, an elastic body (low spring, second elastic body), and an elastic body (high spring, first elastic body), changes in engine posture such as idle Is small, the space and elastic body (low spring) suppress vibration. Also, if the engine posture changes suddenly, such as sudden start or braking, and the displacement cannot be suppressed by the space and the elastic body (low spring, second elastic body), the engine is driven by the elastic body (high spring, first elastic body). A structure that suppresses the displacement of the posture and converges the vibrations quickly.
(3) With the above configuration, when there is little change in the engine posture, such as an idle / cruise state, vibration in the front-rear direction is reduced by the space and the elastic body (low spring, second elastic body). Also, if the engine posture changes greatly, such as sudden start and sudden braking, and the displacement of the engine posture cannot be suppressed by the space and the elastic body (low spring, second elastic body), the elastic body (high spring, first elastic body) Body) suppresses sudden changes in engine attitude, and quickly converges and attenuates vibrations.

Related to claim 4
(1) In a configuration using a torque rod of an automobile engine mount system, by incorporating a bush at the rear end of the torque rod, the engine longitudinal vibration is distributed in the longitudinal and rotational (up and down, left and right) directions, and the longitudinal vibration on the vehicle body side is To reduce.
(2) A bush structure that reduces the longitudinal vibration on the vehicle body side by dispersing the longitudinal vibration of the engine in the longitudinal direction and the rotational direction. The structure is incorporated in the rear end of the torque rod. The rear end of the torque rod is a shaft (having a spline shape) and is inserted into the boss portion of the bush. The bush is provided with an elastic body (having a straight shape) between the case and the boss portion. As a front-rear direction stopper structure, an elastic body is provided between the bush and the plate on the shaft side. Six to twenty-four key grooves are provided in the inner diameter portion of the boss portion to form an uneven structure. A shaft (having an oblique spline shape with respect to the axial direction) is inserted on the inner diameter side of the boss portion, and the boss portion is rotated when the shaft moves in the front-rear direction. Thereby, the input to the elastic body is dispersed in the front-rear direction and the rotational direction with respect to the engine front-rear behavior. The stopper structure is composed of a bush side plate, a shaft side plate, and an elastic body. When the engine is largely displaced or at high torque, the shaft side plate moves toward the bush side plate and comes into contact with the elastic body, thereby Supports front / rear input from. This stopper structure is for ensuring the durability of the bushing elastic body.
(3) With the above configuration, the boss portion is twisted in the rotational direction by the spline of the shaft with respect to the engine longitudinal behavior (the shaft moves in the longitudinal direction), and the input to the elastic body is dispersed in the longitudinal and rotational directions. Accordingly, vibration transmission to the vehicle body side in the longitudinal direction of the engine is in the longitudinal direction, the vertical direction, and the lateral direction.

  Next, embodiments of the present invention will be described with reference to the drawings.

First embodiment ...
FIG. 1 shows a torque rod 1 according to a first embodiment of the present invention. FIG. 1 (A) is a plan view of the torque rod 1 and FIG. 1 (B) is a front view of the torque rod 1. The torque rod 1 is attached to the lower side of the engine 2 and the gear box 3. FIG. 2 is an explanatory view of the clutch mechanism 15 provided in the torque rod 1, and FIG. 3 is an operation explanatory view of the torque rod 1.

  As shown in FIG. 1, the torque rod 1 according to this embodiment is connected to the engine (FF horizontal engine) 2 side at one end (front end) of a rod 4 arranged in the front-rear direction of the vehicle body. A torque rod bush 5 is provided, and a vehicle body side torque rod bush 6 connected to the vehicle body (not shown) side is provided at the other end (rear end) of the rod 4, and the roll direction vibration generated on the engine side is subjected to the vehicle longitudinal direction. The vibration is converted into vibration to provide a vibration-proofing action, and is further connected to a gear box 3 on the tire (not shown) side at the middle position in the longitudinal direction of the rod 4. It is characterized in that an intermediate torque rod bush 7 is provided for conversion to longitudinal vibration.

  The intermediate torque rod bush 7 includes an outer cylinder 8 made of a rigid material such as a metal connected to an intermediate portion in the longitudinal direction of the rod 4 and an annular shape fixed to the inner peripheral surface of the outer cylinder 8 by means such as vulcanization adhesion. A rubber-like elastic body 9 and an inner cylinder 10 made of a rigid material such as metal fixed to the inner peripheral side of the rubber-like elastic body 9 by means such as vulcanization adhesion are provided. In the plane, a required number of straight portions (thickening portions) 11 for reducing the spring constant in the longitudinal direction of the vehicle body are provided. The intermediate torque rod bush 7 is connected to the gear box 3 by inserting and fixing the connecting member 12 on the gear box 3 side to the inner peripheral side of the inner cylinder 10. The spring constant of the rubber-like elastic body 9 is set in accordance with the corresponding tire side driving reaction force vibration.

  The engine side torque rod bush 5 includes an outer cylinder 13 made of a rigid material such as metal connected to one end of the rod 4 and an annular rubber shape fixed to the inner peripheral surface of the outer cylinder 13 by means such as vulcanization adhesion. An elastic body 14 and a clutch mechanism 15 provided on the inner peripheral side of the rubber-like elastic body 14 are provided, and the cam 16 of the clutch mechanism 15 is fixed to a connecting member 17 on the engine 2 side, whereby the engine 2. Connected to. The spring constant of the rubber-like elastic body 14 is set in accordance with the corresponding engine-side roll direction vibration.

  As shown in FIG. 2, the clutch mechanism 15 senses the attitude of the engine 2 with a sensor (not shown) and electrically switches and controls the cam 16. In addition to the cam 16, the clutch mechanism 15 controls the cam 16. An electromagnet 18, a plunger 19, a connecting rod 20, a return coil spring 21 and the like for rotating are provided. FIG. 2A shows a state in which the cam 16 rotates counterclockwise in the drawing and both end surfaces 16a in the longitudinal direction of the cam 16 are in contact with the inner surface 14a of the rubber-like elastic body 14. On (ON) ”, vibration on the engine 2 side is transmitted to the torque rod 1 via the cam 16. When the electromagnet 18 is energized from the state of FIG. 2A and the electromagnet 18 is excited, the plunger 19 is attracted, and the cam 16 connected to the plunger 19 via the connecting rod 20 rotates clockwise in the figure. Rotate to. The cam 16 rotated clockwise in the figure has its both end surfaces 16a separated from the inner surface 14a of the rubber-like elastic body 14, and is in the state of FIG. 2B. This state is "clutch disengagement (OFF)" The transmission of the vibration on the second side to the torque rod 1 is cut off. When the energization is stopped, the plunger 19 returns by the elasticity of the return coil spring 21, and the cam 16 rotates counterclockwise in the figure to return to the “clutch engaged (ON)” state in FIG. The clutch mechanism 15 is activated when the driving reaction force generated on the tire side becomes a certain level or larger, so that the vibration transmission from the engine side 2 to the torque rod 1 is cut off, and only the vibration transmission from the tire side is performed. It is provided to do.

  The vehicle body side torque rod bush 6 includes an outer cylinder 22 connected to the other end of the rod 4 and an annular rubber-like elastic body 23 fixed to the inner peripheral surface of the outer cylinder 22 by means such as vulcanization adhesion. And an inner cylinder 24 fixed to the inner peripheral side of the rubber-like elastic body 23 by means such as vulcanization adhesion. A connecting member (not shown) on the vehicle body side is provided on the inner peripheral side of the inner cylinder 24. ) Is inserted and fixed to be connected to the vehicle body.

In the torque rod 1 having the above-described configuration, as shown in FIG. 3, when roll direction vibration W ₁ generated on the engine 2 side during vehicle travel is input, this roll direction vibration W ₁ is applied to the vehicle body by the engine side torque rod bush 5. It is converted in the front-rear direction vibration W _3. Further, a driving reaction force vibration W ₂ generated on the tire side (this driving reaction force vibration W ₂ is also a roll vibration as a type of vibration, but the direction, amplitude, etc. are different from the roll direction vibration W ₁ . ) Is input, the driving reaction force vibration W ₂ is similarly converted into the vehicle body longitudinal vibration W ₃ by the intermediate torque rod bush 7. At this time, the engine side torque rod bush 5 is separated from the engine 2 side by the clutch mechanism 15 so as not to hinder this conversion action. When driving reaction force vibration W ₂ that is caused to the tire side is small, operates the engine-side torque rod bush 5, at a predetermined value or more larger, intermediate torque rod bush 7 clutch mechanism 15 is activated to operate . Therefore, in order to convert the roll direction vibration W ₁ generated on the engine 2 side and the driving reaction force vibration W ₂ generated on the tire side into vibrations in the vehicle body front and rear direction, respectively, It can be effectively reduced. Therefore, the vibration-proof performance of the torque rod 1 can be improved as compared with the conventional one, and the ride comfort for the passenger can be improved.

  In this embodiment, the rod 4 is located between a portion (front portion) 4a disposed between the engine side torque rod bush 5 and the intermediate torque rod bush 7 and between the intermediate torque rod bush 7 and the vehicle body side torque rod bush 8. It is divided into a portion (back portion) 4b to be arranged. Both the parts 4a and 4b may be arranged on the same axis, but may be arranged so as to be eccentric from each other as shown.

Second embodiment ...
4 to 6 show a torque rod 31 according to a second embodiment of the present invention. FIG. 4 is a plan view of the torque rod 31, and FIG. 5A is an enlarged cross-sectional view taken along line AA in FIG. FIG. 5B shows a state where the torque rod 31 is attached below the engine 32, FIG. 5B is a cross-sectional view taken along line BB in FIG. 5A, and FIG. 6 is an enlarged cross-sectional view taken along line CC in FIG. The torque rod 31 is attached to the lower side of the engine 32. FIG. 7 is an operation explanatory view of the torque rod 31.

  As shown in FIG. 4, the torque rod 31 according to this embodiment is disposed on one side (front end) of a rod 34 arranged in the front-rear direction of the vehicle body on the side of the engine (FF horizontal engine) 32 (see FIG. 5). The engine-side torque rod bush 35 to be connected and the other end (rear end) of the rod 34 are provided with a vehicle-side torque rod bush 36 to be connected to the vehicle body (not shown), and a roll generated on the engine 32 side. It converts the directional vibration into the longitudinal vibration of the vehicle body to provide a vibration isolating action, and is further characterized in that the engine side torque rod bush 35 is configured as follows.

  That is, as shown in FIGS. 5 and 6, the engine side torque rod bush 35 is fixed to the outer cylinder 37 connected to one end of the rod 34 and to the inner peripheral surface of the outer cylinder 37 by means such as vulcanization adhesion. The annular first rubber-like elastic body 38, the annular recess 39 provided on the inner peripheral surface of the first rubber-like elastic body 38, and the inner circumference of the first rubber-like elastic body 38 above and below the annular recess 39, respectively. An inner cylinder 40 fixed to the surface by means such as vulcanization adhesion, a disk-like operating member 42 connected to the lower side of the engine 32 via a connecting member 41 and loosely inserted into the annular recess 39, and a disk-like shape A second rubber-like elastic body 43 interposed between the actuating member 42 and the first rubber-like elastic body 38. The first rubber-like elastic body 38 is set to a relatively high spring constant and is The two rubber-like elastic body 43 is set to a relatively low spring constant. There.

  The disk-like operating member 42 is loosely inserted in the radial direction with respect to the first rubber-like elastic body 38 via a gap, and is also loosely inserted in the vertical direction via the gap. A pair of second rubber-like elastic bodies 43 are provided on the left and right sides of the disk-like operating member 42. Each of the pair of second elastic bodies 43 is fixed to the outer peripheral surface of the disk-like operation member 42 by means such as vulcanization adhesion, and the annular groove-like engagement portion 44 provided on the bottom surface of the annular recess 39. It is press-fitted and fixed to.

Further, as shown in FIG. 6, the outer diameter dimension d ₁ of the disk-like actuating member 42 is set larger than the inner diameter dimension d _{2 of} the first rubber-like elastic body 38 and the bottom diameter dimension d _{3 of the} annular recess 39. and it is set smaller than the bottom diameter d ₄ of the annular groove-like engaging portion 44. Further, the thickness dimension t ₁ of the disc-like actuating member 42 is set to be smaller than the width dimension t ₂ of the annular recess 39 and is set to be approximately the same as the width dimension t _{3 of the} annular groove-like engagement portion 44. Yes.

In the torque rod 31 of the above configuration, as shown in FIG. 7 (A), a relatively small amplitude idling vibration W ₄ of occurring in an engine 32 side is inputted, the idle vibration W ₄ relatively low spring The set second rubber-like elastic body 43 is damped. Since the idle vibration W ₄ has a relatively small amplitude, the disk-like operating member 42 does not come into contact with the first rubber-like elastic body 38. Further, as shown in FIG. 7 (B), a relatively large amplitude driving reaction force vibration W ₅ of is caused in the tire side when the vehicle is traveling is inputted, set the driving reaction force vibration W ₅ relatively high spring The first rubber-like elastic body 38 is damped. Since the driving reaction force vibration W ₅ is roll vibration and has a relatively large amplitude, the disk-like operation member 42 contacts the inner surface of the annular recess 39 of the first rubber-like elastic body 38 and transmits the vibration W ₅ . . Therefore, in order for the plurality of elastic bodies composed of the first and second rubber-like elastic bodies 38 and 43 set so as to have different spring constants to operate in a suitable manner, the idle vibration W ₄ and the drive reaction force vibration W ₅ it is possible to effectively reduce respectively. Therefore, the vibration-proof performance of the torque rod 31 can be improved as compared with the conventional one, and the ride comfort for the passenger can be improved.

  In this embodiment, the vulcanized molded product composed of the outer cylinder 37, the first rubber-like elastic body 38 and the inner cylinder 40 is assembled with the disk-like actuating member 42 and the second rubber-like elastic body 43 therein. Since it is necessary, it has a vertically divided structure as shown in the figure.

Third embodiment ...
8 and 9 show a torque rod 51 according to a third embodiment of the present invention. FIG. 8 is a plan view of the torque rod 51, and FIG. 9A is an enlarged view of a main part of FIG. 9 (B) is a cross-sectional view taken along the line DD in FIG. 9 (A) and shows a state in which the torque rod 51 is attached below the engine 52.

  As shown in FIG. 8, the torque rod 51 according to this embodiment is disposed on one side (front end) of the rod 54 arranged in the front-rear direction of the vehicle body on the engine (FF horizontal engine) 52 (see FIG. 9) side. The engine-side torque rod bush 55 to be connected and the other end (rear end) of the rod 54 are provided with a vehicle-side torque rod bush 56 to be connected to the vehicle body (not shown), and a roll generated on the engine 52 side. It converts the directional vibration into the longitudinal vibration of the vehicle body to provide a vibration-proofing action, and is further characterized in that the engine side torque rod bush 55 is configured as follows.

  That is, as shown in FIG. 9, the engine-side torque rod bush 55 includes an outer cylinder 57 connected to one end of the rod 54, and an annular shape fixed to the inner peripheral surface of the outer cylinder 57 by means such as vulcanization adhesion. First rubber-like elastic body 58, an annular second rubber-like elastic body 59 fixed to the inner peripheral surface of the first rubber-like elastic body 58 by means such as simultaneous vulcanization molding, and the lower side on the engine 52 side And a rod-like actuating member 60 loosely inserted on the inner peripheral side of the second rubber-like elastic body 59, and the first rubber-like elastic body 58 is set to a relatively high spring constant. The second rubber-like elastic body 59 is set to a relatively low spring constant.

  Further, as shown in the figure, the inner diameter surface of the outer cylinder 57 and the outer diameter surface of the first rubber-like elastic body 58 are formed in a plane perfect circle shape. The outer diameter surface and the inner diameter surface of the rubber-like elastic body 59 are formed in an oval or elliptical shape with a long diameter arranged along the longitudinal direction of the vehicle body. The inner diameter surface of the second rubber-like elastic body 59, the rod-like actuating member 60, and the like. A vehicle body longitudinal gap 61 having a predetermined size is set between the two.

In the torque rod 51 of the above structure, when vibration W ₆ of relatively small amplitude of idle vibrations occurring in an engine 52 side is inputted, the second rubber which is set to the small amplitude vibration W ₆ relatively low spring The elastic body 43 is damped. Since the small amplitude vibration W ₆ has a relatively small amplitude as the name suggests, the rod-like actuating member 60 elastically deforms only the second rubber-like elastic body 43 having a relatively low spring, and the first rubber on the outer peripheral side thereof. The elastic body 58 is not deformed. Further, when vibration W ₇ of relatively large amplitude of the driving reaction force vibration which is caused in the tire side when the vehicle is traveling is inputted, the first rubber-like elastic body that is set to the large-amplitude vibration W ₇ relatively high spring 58 decays. Since the large amplitude vibration W ₇ has a relatively large amplitude as the name suggests, the rod-like actuating member 60 elastically deforms not only the second rubber-like elastic body 43 but also the first rubber-like elastic body 58 on the outer peripheral side thereof. . Therefore, in order for the plurality of elastic bodies composed of the first and second rubber-like elastic bodies 58 and 59 set so as to have different spring constants to operate in a suitable manner, the small amplitude vibration W ₆ and the large amplitude vibration W ₇ can be effectively reduced, respectively. Therefore, the vibration-proof performance of the torque rod 51 can be improved as compared with the conventional one, and the ride comfort for the passenger can be improved.

  In this embodiment, the gap 61 is provided for setting the initial amplitude at the start of the damping operation as so-called play. However, if play is not required, the gap 61 may be omitted.

Fourth embodiment ...
10 and 11 show a torque rod 71 according to a fourth embodiment of the present invention. FIG. 10 is a cross-sectional view of the main part of the torque rod 71, and FIG. 11 is a cross-sectional view taken along the line EE of FIG. A longitudinal sectional view of the vehicle body side torque rod bush 76 provided in the torque rod 71 is shown.

  The torque rod 71 according to this embodiment includes an engine side torque rod bush (connected to an engine (FF horizontal engine, not shown)) to one end (front end) of a rod 74 arranged in the longitudinal direction of the vehicle body. A vehicle body side torque rod bush 76 connected to the vehicle body (not shown) side is provided at the other end (rear end) of the rod 74 and a roll direction vibration generated on the engine side is provided in the vehicle longitudinal direction. It converts to vibrations to provide a vibration-proofing action, and is further characterized in that the vehicle body side torque rod bush 76 is configured as follows.

  That is, as shown in FIGS. 10 and 11, the vehicle body side torque rod bush 76 includes a cylindrical case 77 with a base 78 fixed to the vehicle body side, and means such as vulcanization adhesion to the inner peripheral surface of the case 77. And an annular boss portion 80 fixed to the inner peripheral surface of the rubber-like elastic body 79 by means of vulcanization adhesion or the like. In this plane, a pair of straight portions (thickening portions) 81 for reducing the spring constant in the left-right direction of the vehicle body are provided on the left and right.

  A screw-like engagement portion 83 is provided on the inner peripheral surface of the boss portion 80, and the screw-like engagement portion 83 is inserted into the inner periphery of the boss portion 80 so as to be relatively displaceable. Is engaged with a screw-like engaging portion 84 provided corresponding to the outer peripheral surface of the boss portion 80 to convert the axial displacement of the rod 74 into the axial displacement and the rotational displacement of the boss portion 80. That is, the pair of screw-like engaging portions 83, 84 is, for example, a combination of a radially inwardly protruding portion provided on the inner peripheral surface of the boss portion 80 and a screw groove provided on the outer peripheral surface of the rod 74. As described above, the transmission mechanism 82 that converts the axial displacement of the rod 74 into the axial displacement and the rotational displacement of the boss portion 80 is configured by engaging the former convex portion with the latter screw groove. Yes.

  Further, the torque rod 71 is provided with an axial stopper mechanism 85 for limiting the axial displacement amount of the rod 74 to a predetermined amount with respect to the vehicle body side torque rod bush 76 fixed to the vehicle body, In this embodiment, the stopper mechanism 85 is configured by a combination of a case side plate 86 fixed to the end surface portion of the case 77 and a rod side plate 87 fixed to the outer peripheral side of the rod 74 so as to face the plate. ing. One of the plates 86 and 87 (rod side plate 87 in the figure) is covered with a rubber-like elastic body 88 for buffering when the stopper is operated. The stopper mechanism 85 is provided with a pair in the axial direction so as to operate in both axial directions.

  In the torque rod 71 having the above-described configuration, for example, when the vehicle passes through the unevenness of the road surface and the engine largely shakes in the front-rear direction, the large vibration is transmitted through the engine-side torque rod bush and the rod to the vehicle-body side torque rod bush 76 having the above-described configuration. However, since the vehicle body side torque rod bush 76 has a transmission mechanism 82 that converts the axial displacement of the rod 74 into the axial displacement and the rotational displacement of the boss portion 80, a large vibration is generated in the shaft. As a result, the axial displacement amount (amplitude) of the rod 74 is reduced. Therefore, since it is sufficient that the reduced axial displacement is absorbed by the vehicle body side torque rod bush 76, a large vibration can be effectively reduced. Therefore, the vibration-proof performance of the torque rod 71 can be improved as compared with the prior art, and the ride comfort for the passenger can be improved. Further, since the axial stopper mechanism 85 is provided, the rubber-like elastic body 79 is not overloaded.

It is a figure which shows the torque rod which concerns on 1st Example of this invention, Comprising: FIG. 1 (A) is a top view of the torque rod, FIG.1 (B) is a front view of the torque rod, Front view of the engine and gearbox mounted below FIG. 2A is an explanatory diagram of a clutch mechanism provided in the torque rod, FIG. 2A is an explanatory diagram of a clutch engaged state, and FIG. 2B is an explanatory diagram of a clutch disengaged state FIG. 3 (A) is an explanatory diagram viewed from the front, and FIG. 3 (B) is an explanatory diagram viewed from above. Torque rod plan view according to the second embodiment of the present invention 5A is an enlarged cross-sectional view taken along the line AA in FIG. 4, and is a cross-sectional view showing a state where the torque rod is attached to the lower side of the engine, and FIG. 5B is a line BB in FIG. Cross section FIG. 5 is an enlarged cross-sectional view taken along the line CC in FIG. 4 and shows a state in which the torque rod is attached below the engine. FIG. 7A is an explanatory diagram when an idle vibration is input, and FIG. 7B is an explanatory diagram when a driving reaction force vibration is input. The top view of the torque rod which concerns on 3rd Example of this invention 9A is an enlarged view of the main part of FIG. 8, FIG. 9B is a cross-sectional view taken along the line DD in FIG. 9A, and is a cross-sectional view of the state where the torque rod is attached below the engine. Cross-sectional view of main parts of a torque rod according to a fourth embodiment of the present invention FIG. 10 is a cross-sectional view taken along line EE in FIG. 10, and a vertical cross-sectional view of a vehicle body side torque rod bush provided on the torque rod.

Explanation of symbols

1, 31, 51, 71 Torque rod 2, 32, 52 Engine 3 Gear box 4, 34, 54, 74 Rod 5, 35, 55 Engine side torque rod bush 6, 36, 56, 76 Vehicle body side torque rod bush 7 Intermediate Torque rod bushing 8, 13, 22, 37, 57 Outer cylinder 9, 14, 23, 38, 43, 58, 59, 79, 88 Rubber elastic body 10, 24, 40 Inner cylinder 11, 81 Straight part 12, 17 , 41 connecting member 15 clutch mechanism 16 cam 18 electromagnet 19 plunger 20 connecting rod 21 return coil spring 39 annular recess 42, 60 actuating member 44, 83, 84 engaging portion 61 gap 77 case 78 base 80 boss portion 82 transmission mechanism 85 shaft Direction stopper mechanism 86,87 plate

Claims (4)

An engine side torque rod bush (5) connected to the engine side is provided at one end of a rod (4) arranged in the longitudinal direction of the vehicle body, and a vehicle body connected to the vehicle body side at the other end of the rod (4). In the torque rod (1) which is provided with a side torque rod bush (6) and converts vibrations in the roll direction generated on the engine side into vibrations in the longitudinal direction of the vehicle body for vibration isolation,
A torque rod characterized in that an intermediate torque rod bush (7) is provided at an intermediate position of the rod (4), which is connected to the tire side and converts driving reaction force vibration from the tire into vehicle body longitudinal vibration. An engine side torque rod bush (35) connected to the engine side is provided at one end of a rod (34) arranged in the longitudinal direction of the vehicle body, and a vehicle body connected to the vehicle body side at the other end of the rod (34). In the torque rod (31) provided with the side torque rod bush (36), which converts vibration in the roll direction generated on the engine side into vibration in the longitudinal direction of the vehicle body for vibration isolation,
The engine side torque rod bush (35) includes an outer cylinder (37) connected to one end of the rod (34), and a first rubber-like elastic body connected to the inner peripheral side of the outer cylinder (37). 38), an annular recess (39) provided on the inner peripheral surface of the first rubber-like elastic body (38), and a disk-like operating member connected to the engine side and loosely inserted into the annular recess (39) (42) and a second rubber-like elastic body (43) interposed between the operating member (42) and the first rubber-like elastic body (38), and the first rubber-like elastic body (38). ) Is set to a relatively high spring constant, and the second rubber-like elastic body (43) is set to a relatively low spring constant. An engine side torque rod bush (55) connected to the engine side is provided at one end of a rod (54) arranged in the longitudinal direction of the vehicle body, and a vehicle body connected to the vehicle body side at the other end of the rod (54). In the torque rod (51) which is provided with a side torque rod bush (56) and converts vibrations in the roll direction generated on the engine side into vibrations in the longitudinal direction of the vehicle body for vibration isolation,
The engine side torque rod bush (55) includes an outer cylinder (57) connected to one end of the rod (54), and a first rubber-like elastic body (57) connected to the inner peripheral side of the outer cylinder (57). 58), a second rubber-like elastic body (59) connected to the inner peripheral side of the first rubber-like elastic body (58), and a second rubber-like elastic body (59) connected to the engine side. A rod-like operation member (60) loosely inserted on the inner peripheral side, the first rubber-like elastic body (58) is set to a relatively high spring constant, and the second rubber-like elastic body (59) is A torque rod having a relatively low spring constant. An engine side torque rod bush connected to the engine side is provided at one end of a rod (74) arranged in the longitudinal direction of the vehicle body, and a vehicle body side torque rod connected to the vehicle body side at the other end of the rod (74). In the torque rod (71) provided with the bush (76), which converts vibration in the roll direction generated on the engine side into vibration in the longitudinal direction of the vehicle body to prevent vibrations.
The vehicle body side torque rod bush (76) includes a case (77) fixed to the vehicle body side, a rubber-like elastic body (79) connected to the inner peripheral side of the case (77), and the rubber-like elastic body. A boss portion (80) connected to the inner peripheral side of (79) and a screw-like engagement portion (83) provided on the inner peripheral surface of the boss portion (80), and the screw-like engagement The portion (83) engages with a screw-like engagement portion (84) provided corresponding to the outer peripheral surface of the rod (74) inserted into the inner periphery of the boss portion (80) so as to be relatively displaceable, A torque rod characterized by converting the axial displacement of the rod (74) into an axial displacement and a rotational displacement of the boss portion (80).

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