JP4442371B2 - Torque rod - Google Patents

Description

  The present invention relates to a torque rod that is interposed between an engine side and a vehicle body side of a vehicle, restricts displacement in the roll direction and longitudinal displacement of the engine, and also performs vibration isolation between the engine side and the vehicle body side. .

Conventionally, in a vehicle, a first bushing at one end and a second bushing at the other end in which a rubber elastic body is interposed between a rigid outer cylinder and an inner cylinder (inner shaft member), and the first bush and the second bush are connected. A torque rod having a rod main body portion that extends between the engine side and the vehicle body side, receives torque from the engine by the torque rod, regulates displacement in the roll direction of the engine, and Displacement is regulated.
This torque rod also has a function of vibration isolation between the engine side and the vehicle body side.

Here, the conventional torque rod is configured such that one end side of the rod main body is integrally coupled to the rigid outer cylinder of the first bush and the other end side is integrally coupled to the rigid outer cylinder of the second bush. Yes.
That is, the rod main body portion is connected to the outer cylinder of the first bush and the outer cylinder of the second bush.
For example, Patent Document 1 below discloses this type of torque rod.

In many cases, the torque rod is configured such that one of the first bush and the second bush at both ends is a large bush having a large diameter and the other is a small bush having a small diameter.
FIG. 6 shows a specific example.
In the case of the torque rod 200 shown in the figure, the first bush 202 is made of a large bush, the second bush 204 is made of a small bush, the metal rigid outer cylinder 206 of the first bush 202, and the second bush 204 The rod main body 210 is connected to the metal rigid outer cylinder 208 in the front-rear direction (vehicle front-rear direction).
That is, the left end side of the rod main body 210 in the figure is integrally coupled to the outer cylinder 208 of the second bush 204, and the right end side is integrally coupled to the outer cylinder 206 of the first bush 202.

The second bush 204 has a metal rigid inner cylinder 212 arranged concentrically with the outer cylinder 208, and a space between the inner cylinder 212 and the outer cylinder 208 is interposed via the metal sleeve 213. A rubber elastic body 214 is interposed between the inner cylinder 212 and the outer cylinder 208 so as to be buried.
Here, the rubber elastic body 214 is fixed to the inner peripheral surface of the metal sleeve 213, and is fixed to the outer cylinder 208 by axially pressing the metal sleeve 213 into the outer cylinder 208.

On the other hand, the first bush 202 has a metallic rigid inner cylinder 216 at a position eccentric to the second bush 204 side from the center of the outer cylinder 206, that is, a position eccentric to the left side in the figure. A rubber elastic body 218 is integrally fixed to 216 by vulcanization adhesion.
The rubber elastic body 218 is also integrally vulcanized and bonded to the inner peripheral surface of the metal sleeve 220, and is fixed to the outer cylinder 206 by press-fitting the metal sleeve 220 into the outer cylinder 206 in the axial direction.

On the first bushing 202 side, a rubber elastic body 218 has a main body rubber portion 222 fixed to the inner cylinder 216 and a first stopper rubber portion 224 that abuts against the main body rubber portion 222 during vehicle acceleration and serves as a stopper. An excessive displacement in the roll direction of the engine is regulated by the stopper action of the first stopper rubber portion 224.
On the opposite side of the first stopper rubber portion 224, a thin second stopper rubber portion 226 is provided that serves as a stopper during deceleration.

In this torque rod 200, when the inner cylinder 212 of the second bush 204 consisting of a small bush is fixed to the engine side and the inner cylinder 216 of the first bush 202 consisting of a large bush is fixed to the vehicle body side, the acceleration of the vehicle The rod body 210 is sometimes pulled in the direction indicated by the arrow in FIG. 6B in accordance with the displacement of the engine in the roll direction, and the outer cylinder 206 of the first bush 202 made of a large bush causes a large movement in the same direction.
That is, the outer cylinder 206 largely moves in the front-rear direction mainly with acceleration / deceleration of the vehicle.
In particular, when the torque rod 200 is attached so as to connect the lower part of the engine and the vehicle body side, the torque applied to the torque rod 200 becomes larger, so that the movement of the outer cylinder 206 in the front-rear direction also becomes larger.

In addition to this, the outer cylinder 206 of the first bushing 202 moves in various directions in various modes in addition to the above-described longitudinal movement as the torque rod 200 absorbs vibration.
At this time, if there are other parts or the like within the range of movement (displacement) of the outer cylinder 206, the outer cylinder 206 will cause interference there.
Therefore, a necessary space must be secured around the outer cylinder 206.
However, depending on the vehicle, it may be difficult to secure such a space, and in such a case, it is difficult to attach the torque rod 200 itself.

  Further, in the case of the torque rod 200, a stopper rubber portion (first stopper rubber portion) 224 that functions as a stopper during vehicle acceleration must be provided on the side opposite to the second bush 204 with respect to the inner cylinder 216. Further, the total length L of the torque rod 200 becomes long, and therefore, there is a problem that a long space in the front-rear direction must be secured when the torque rod 200 is attached to the vehicle.

When the torque rod 200 is attached in such a form that the lower part of the engine is connected to the vehicle body side, a large load is input to the torque rod 200 when the engine is rolled.
In this case, it is desirable that the rod body 210 is made of iron so that it can withstand the input of such a large load. In this case, however, the mass of the rod body 210 increases, and the resonance frequency during vehicle acceleration decreases. There is also a problem that acceleration noise increases.

JP 2000-65113 A

  The present invention has been made for the purpose of providing a torque rod that can be mounted without any trouble even in a narrow space, against the background described above.

Thus, according to the first aspect of the present invention, there is provided a first bushing at one end and a second bushing at the other end in which a rubber elastic body is interposed between a rigid outer cylinder and an inner shaft member at the center or substantially the center thereof. have a rod body portion connecting the first bush and the second bush, is interposed across the engine side and the vehicle body side of the vehicle, the first bush and the second bush of each of the rubber elastic body A torque rod that restricts displacement in the roll direction and the front-rear direction of the engine based on elastic deformation in a direction perpendicular to the axis and that insulates vibration between the engine side and the vehicle body side, and surrounds the outer cylinder in the first bush. The rod main body is integrally connected to the outer cylinder of the second bush, and the shape of the rod main body is the other end of the first bush. The Forms a bay bent shapes of leading to the inner shaft member to bypass the cylinder, integrally joined to said other end to an end of the bushing axial direction of the inner shaft member, said inner first bush The shaft member is movable to a position integrally with the rod body based on the elastic deformation of the rubber elastic body of the first bush, and the outer cylinder of the first bush is fixed to the first bush. It is characterized by the fact that it is attached .

  According to a second aspect of the present invention, in the first aspect, the inner shaft member of the second bush is configured as an inner cylinder having an internal hollow structure.

  According to a third aspect of the present invention, in any one of the first and second aspects, the first bush is made of a large bush, and is fixed to the vehicle body side in an outer cylinder thereof, and the second bush is made of a small bush. The inner shaft member is fixed to the engine side.

  According to a fourth aspect of the present invention, in the third aspect, the rubber elastic body in the first bush is in contact with the main body rubber portion fixed to the inner shaft member and the main body rubber portion during vehicle acceleration to act as a stopper. The stopper rubber part is arranged on the second bush side with respect to the main body rubber part.

  According to a fifth aspect of the present invention, in any one of the first to fourth aspects, the rod main body portion is provided with a reinforcing rib along a direction in which the rod main body portion extends.

Effects and effects of the invention

  As described above, according to the present invention, the outer cylinder of the first bush is configured in a continuous annular shape without any cut in the circumferential direction, and one end side of the rod main body is integrally coupled to the outer cylinder of the second bush. The other end side is a bay bent shape that bypasses the outer cylinder of the first bush and reaches the inner shaft member, and the other end side is an end portion of the inner shaft member of the first bush in the bush axial direction. They are united together.

  In the case of the torque rod of the present invention, the other end side of the rod main body portion is not coupled to the outer cylinder of the first bush, but is integrally coupled to the inner shaft member of the first bush, and the inner shaft member is the rod main body portion. Therefore, the outer cylinder of the first bush can be made immovable regardless of the longitudinal movement of the rod body or various other movements. It is not necessary to secure a necessary space for the movement of the outer cylinder around the outer cylinder of one bush, so that it is possible to attach the torque rod to a narrow space without any trouble.

  Further, in the torque rod of the present invention, the outer body of the first bushing does not move integrally when the rod body moves, but the rod body moves alone, so the mass of the movement at that time becomes smaller and the resonance frequency becomes lower. There is also an advantage that acceleration noise during vehicle acceleration can be reduced by moving to a higher-order side than the frequency that causes a problem in practice and reducing the resonance level.

In addition, a notch is provided in the outer cylinder of the first bush, and the other end side of the rod main body is inserted into the first bush through the notch and the like, and is integrally coupled to the inner shaft member. In this case, the strength of the outer cylinder is reduced by providing a notch in the outer cylinder of the first bush, resulting in insufficient strength.
However, in the present invention, since the outer cylinder of the first bush has a continuous annular shape without a cut in the circumferential direction, the required strength can be maintained.
Here, the outer cylinder of the second bush can also be configured in a continuous annular shape without a cut in the circumferential direction.

Further, the inner shaft member in the second bush can be configured as an inner cylinder having an internal hollow structure (claim 2).
The inner shaft member of the first bush can also be configured as an inner cylinder with an internal hollow structure.
Furthermore, each of these inner cylinders can be made cylindrical.

  In the present invention, the first bush is formed as a large bush, and the outer cylinder is fixed to the vehicle body side, and the second bush is formed as a small bush, and the inner shaft member is fixed to the engine side. (Claim 3).

Further, the rubber elastic body in the first bush is provided with a main body rubber portion fixed to the inner shaft member and a stopper rubber portion that abuts on the main body rubber portion during the acceleration of the vehicle and serves as a stopper, and the stopper rubber. The portion can be disposed on the second bush side with respect to the main rubber portion (claim 4).
In this case, the longitudinal length of the entire torque rod can be shortened, and the required mounting space in the longitudinal direction can be further shortened.

In the present invention, a reinforcing rib can be provided on the rod body along the direction in which the rod body extends (Claim 5).
If it does in this way, a rod main-body part can be highly strengthened effectively.

Next, embodiments of the present invention will be described in detail with reference to the drawings.
1 to 5, reference numeral 10 denotes a torque rod according to this embodiment, which connects a first bush 12 comprising a large bush at one end and a second bush 14 comprising a small bush at the other end in the vehicle longitudinal direction. Rod body portion 16.
The second bush 14 includes a metal rigid outer cylinder 18, a metal rigid inner cylinder (inner shaft member) 20 disposed at the center thereof, and an annular shape between the inner cylinder 20 and the outer cylinder 18. And a rubber elastic body 22 in which the space is filled with a metal sleeve 24. That is, a rubber elastic body 22 is interposed between the inner cylinder 20 and the outer cylinder 18.
The inner cylinder 20 and the rubber elastic body 22 are fixed to the outer cylinder 18 together with the metal sleeve 24 by axially press-fitting the metal sleeve 24 into the outer cylinder 18.

The first bush 12 includes a metal rigid outer cylinder 26, a metal rigid inner cylinder (inner shaft member) 28 disposed substantially at the center thereof, and a rubber elastic body interposed therebetween. 30.
Here, the rubber elastic body 30 has an inner peripheral surface integrally fixed to the outer peripheral surface of the inner cylinder 28 by vulcanization adhesion, and an outer peripheral surface is also integrally integrated with the inner peripheral surface of the metal sleeve 32 by vulcanization adhesion. It is fixed.
The metal sleeve 32 is pressed into the outer cylinder 26 in the axial direction, so that the inner cylinder 28 and the rubber elastic body 30 are fixed to the outer cylinder 26 together with the metal sleeve 32.

  The inner cylinder 28 is a member having a bottomed cylindrical shape with a bottom portion 34 as shown in FIG. 4, and as shown in FIG. 3, the inner cylinder 28 is on the vehicle rear side with respect to the outer cylinder 26, that is, the second bush 14. It is arrange | positioned in the position eccentric to the side away from.

The rubber elastic body 30 in the first bush 12 includes a main rubber part 36 fixed to the inner cylinder 28, and arc-shaped through-holes (recesses) 37 formed on both sides thereof (both in the vehicle front-rear direction). 38, and a first stopper rubber portion 39 and a second stopper rubber portion 40 that face the main body rubber portion 36 in the vehicle front-rear direction with the straight portions 37, 38 therebetween.
Here, the first stopper rubber part 39 mainly contacts the main body rubber part 36 and the inner cylinder 28 at the time of acceleration of the vehicle to perform a stopper action, and the second stopper rubber part 40 is mainly used at the time of sudden deceleration of the vehicle. And it abuts against the inner cylinder 28 and performs a stopper action.

In the present embodiment, the outer cylinder 26 forms a bracket for fixing to the vehicle body side, and fixing portions 42 and 44 for the vehicle body side are integrally formed.
Furthermore, a support bracket 46 for supporting other members is formed integrally with the outer cylinder 26.

The rod main body portion 16 is an iron member, and the left end portion in the drawing, that is, the front end portion in the vehicle front-rear direction, is integrally formed with the outer cylinder 18 in the second bush 14.
As shown in FIG. 4, the rod main body 16 has a planar shape that curves around the outer cylinder 26 of the first bush 12 and reaches the end of the inner cylinder 28 in the bush axis direction. Therefore, an end portion on the vehicle rear side (right end portion in the figure) is integrally fastened and fixed to the bottom portion 34 of the inner cylinder 28 by a bolt 48 and a nut 50.

Specifically, as shown in FIG. 2, a pair of parallel cut surfaces 52 and 54 are formed on the bottom portion 34, and a fitting convex portion 56 is formed between the cut surfaces 52 and 54. On the other hand, a fitting concave portion 58 having a corresponding shape is formed at the end of the rod main body portion 16, and the fitting convex portion 56 and the fitting concave portion 58 are fitted. The bottom 34 and the end of the rod body 16 are firmly fastened and fixed in the bush axis direction by bolts 48 and nuts 50.
A counterbore-shaped recess 60 is formed at the end of the rod body 16, and a part of the head of the bolt 48 is accommodated therein.

The rod main body 16 is also formed with a pair of reinforcing ribs 62 and 64 along the extending direction, and a through hole 66 for draining is formed between them.
The through hole 66 is for preventing water from accumulating in the recess between the reinforcing ribs 62 and 64.
However, it is not always necessary to provide the pair of reinforcing ribs 62 and 64, and only one of the reinforcing ribs can be provided.
In this case, the through hole 66 can be omitted.

  In the torque rod 10 of this embodiment, the inner cylinder 20 of the second bush 14 made of a small bush is fixed to the engine side, for example, the lower part of the engine, and the outer cylinder 26 of the first bush 12 made of a large bush is fixed to the vehicle body side. Then, the torque rod 10 is attached so as to straddle the engine and the vehicle body.

In the torque rod 10 of this embodiment, when the rod main body portion 16 moves in the longitudinal direction of the vehicle or moves in various other modes, the inner cylinder 28 of the first bush 12 as shown in FIG. Moves together with this.
On the other hand, the position of the outer cylinder 26 is fixed regardless of various movements of the rod body 16.
Therefore, it is not necessary to secure a space for securing the movement of the outer cylinder 26 of the first bush 12 when the torque rod 10 is attached, and thus the torque rod 10 can be attached without any trouble even in a narrow space.

  Further, according to the torque rod 10, since the rod main body portion 16 moves independently without the outer cylinder 26 of the first bush 12 moving integrally when the rod main body portion 16 moves, the mass of the movement is reduced. By moving the resonance frequency from the frequency in the practical range to the higher order side and reducing the resonance level, there is also an advantage that acceleration noise during vehicle acceleration can be reduced.

  Further, in the present embodiment, the outer cylinder 26 of the first bush 12 is configured in a continuous annular shape without a cut in the circumferential direction, so that a required strength can be maintained.

  Further, the inner cylinder 28 in the first bush 12 is eccentrically arranged on the right side in the figure, and the stopper rubber part 39 is arranged on the left side in the figure, that is, on the second bush 14 side with respect to the main body rubber part 36. Further, the longitudinal length L (see FIG. 3) of the entire torque rod 10 can be shortened, and the required mounting space in the longitudinal direction can be further shortened.

  Moreover, in this embodiment, since the reinforcing ribs 62 and 64 are provided in the rod main body part 16 along the extending direction of the rod main body part 16, the rod main body part 16 can be effectively strengthened.

  Although the embodiment of the present invention has been described in detail above, this is merely an example, and the present invention can be configured in various forms without departing from the spirit of the present invention.

It is a perspective view which shows the torque rod which is one Embodiment of this invention. It is a disassembled perspective view of the torque rod of FIG. It is a longitudinal cross-sectional view of the torque rod of FIG. It is IV-IV sectional drawing of FIG. It is a top view of the torque rod of FIG. It is a figure which shows an example of the conventional torque rod.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Torque rod 12 1st bush 14 2nd bush 16 Rod main-body part 18, 26 Outer cylinder 20, 28 Inner cylinder (inner side shaft member)
22, 30 Rubber elastic body 36 Main body rubber part 39 First stopper rubber part (stopper rubber part)
62,64 Reinforcement rib

Claims (5)

A first bushing at one end and a second bushing at the other end with a rubber elastic body interposed between a rigid outer cylinder and an inner shaft member at the center or substantially the center thereof, and the first bush and the second bushing are connected. have a rod main body, on the basis of being interposed across the engine side and the vehicle body side of the vehicle, the axis-perpendicular direction of the elastic deformation of each of the rubber elastic body of the first bush and the second bush engine A torque rod that regulates the displacement in the roll direction and the front-rear direction and insulates vibration between the engine side and the vehicle body side ,
The outer cylinder of the first bush is configured in a continuous annular shape without any cut in the circumferential direction, and one end side of the rod main body is integrally coupled to the outer cylinder of the second bush, The other end side is a bay bent shape that bypasses the outer cylinder of the first bush and reaches the inner shaft member, and the other end side is an end portion of the inner shaft member in the bush axis direction. The inner shaft member of the first bush is movable to be integrally moved with the rod main body based on elastic deformation of the rubber elastic body of the first bush, and the first bush A torque rod , wherein the first bush is attached to the outer cylinder in a fixed position .   The torque rod according to claim 1, wherein an inner shaft member of the second bush is configured as an inner cylinder having an internal hollow structure.   3. The engine according to claim 1, wherein the first bush is a large bush, and is fixed to the vehicle body side in an outer cylinder thereof, and the second bush is a small bush, and the inner shaft member is an engine. Torque rod characterized by being fixed to the side.   4. The rubber elastic body according to claim 3, wherein the rubber elastic body in the first bush includes a main body rubber portion fixed to the inner shaft member, and a stopper rubber portion that contacts the main body rubber portion and serves as a stopper during vehicle acceleration. A torque rod comprising: a stopper rubber portion disposed on the second bush side with respect to the main body rubber portion.   The torque rod according to any one of claims 1 to 4, wherein a reinforcing rib is provided on the rod main body portion along a direction in which the rod main body portion extends.

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