JPH0617877A - Engine mount - Google Patents

Abstract

(57) [Abstract] [Purpose] Aim to achieve both the mitigation of motion impact caused by the engine longitudinal movement and the reduction of vibration transmission caused by engine rolling during acceleration. [Structure] A vibration-proof rubber 4 is interposed between the outer cylinder 2 and the inner cylinder 3,
A pair of brackets 6 are provided on both sides of the outer cylinder 2, the inner cylinder 3 and the anti-vibration rubber 4. An elastic stopper 9 is provided between the bracket 6 and the outer cylinder 2 and both ends of the rubber cushion 4 so as to come into contact with the outer cylinder 2 when the outer cylinder 2 translates in the axial direction S. In the engine mount 1 configured as described above and interposed between the engine and the vehicle body 5, the clearance between the outer cylinder 2 and the elastic stopper 9 in the rolling direction r of the outer cylinder 2 caused by the rolling of the engine at the time of acceleration. Clearance C2
Is set to be larger than the clearance C1 in the axial direction S of the outer cylinder 2. Therefore, the sudden displacement and the feeling of hitting of the outer cylinder 2 in the axial direction S are alleviated, and it becomes difficult for the outer cylinder 2 to hit the elastic stopper 9 during rolling during acceleration.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine mount which is used as an antivibration measure when an engine is mounted on a vehicle or the like and is interposed between the engine and the vehicle body.

[0002]

2. Description of the Related Art Conventionally, as a technique of this kind, a cylindrical engine mount as disclosed in, for example, Japanese Utility Model Laid-Open No. 62-322241 is generally known. In this conventional engine mount, as shown in FIG. 7, a main body elastic body 23 is interposed between an outer cylinder 21 and an inner cylinder 22. The outer cylinder 21, the inner cylinder 22, and the main body elastic body 23 are mounted on the vehicle body 24 with respect to the bracket 25 having a U-shaped cross section and the bolt 26.
And a nut 27. Also, the outer cylinder 21
Is connected to the engine via a bracket (not shown). Further, a pair of elastic stoppers 28 are provided between both ends of the outer cylinder 21 and the elastic body 23 and the bracket 25. When the outer cylinder 21 is displaced in the axial direction S following the longitudinal movement of the engine during acceleration / deceleration of the vehicle, the outer cylinder 21 can contact the elastic stopper 28.

Therefore, when the engine moves in the front-back direction and the outer cylinder 21 translates in the same direction, that is, in the axial direction S when the vehicle is accelerated or decelerated, the outer cylinder 21 is elastically moved by the elastic stopper 28.
Or abut on the bracket 25 via the elastic stopper 28. Therefore, the elastic force of the elastic stopper 28 softens the feeling of contact between the outer cylinder 21 and the bracket 25, and softens the acceleration / deceleration shock felt in the vehicle.

[0004]

However, in the above-mentioned prior art, the clearance between the outer cylinder 21 and the elastic stopper 28 only takes into consideration the translational motion of the outer cylinder 21 during acceleration / deceleration, and the clearance during acceleration is increased. Rolling in was not considered. Therefore, when the engine rolls during acceleration, as shown in FIG. 6, the outer cylinder 21 rolls in the rolling direction r and tries to hit the elastic stopper 28 earlier. Alternatively, when the roll angle is large, the outer cylinder 21 is rolled by rolling.
Comes into contact with the bracket 25 via the elastic stopper 28. Therefore, in this case, the engine vibration is transmitted from the engine mount to the vehicle body only while the outer cylinder 21 is in contact with the elastic stopper 28 or only while the outer cylinder 21 is in contact with the bracket 25 via the elastic stopper 28. It becomes easy to be transmitted to 24. Therefore, there is a possibility that the vibration noise perceived in the vehicle is increased accordingly.

The present invention has been made in view of the above-mentioned circumstances, and its object is to alleviate the motion impact caused by the longitudinal movement of the engine and to transmit the vibration caused by the rolling of the engine during acceleration. An object of the present invention is to provide an engine mount capable of achieving both reduction and reduction.

[0006]

In order to achieve the above object, in the present invention, an outer cylinder and an inner cylinder arranged on the same axis, and an outer cylinder and an inner cylinder are interposed. Main body elastic body, a pair of brackets provided on both sides of the outer cylinder, the inner cylinder and the main body elastic body in the axial direction to restrict axial movement of the outer cylinder with respect to the inner cylinder, and each bracket, outer cylinder and main body elastic body. And a stopper made of an elastic body that is provided between both ends of the engine in the axial direction and that can come into contact when the outer cylinder translates in the axial direction, and is interposed between the longitudinal end of the engine and the vehicle body. ,
In the engine mount arranged with the axial direction aligned with the front-rear direction of the engine, regarding the clearance between the outer cylinder and the stopper, the clearance in the rolling direction of the outer cylinder due to the rolling of the engine during acceleration,
The clearance is set larger than the axial clearance of the outer cylinder.

[0007]

According to the above construction, the outer cylinder is connected to one of the engine and the vehicle body, and each bracket is connected to and attached to the other of the engine and the vehicle body.

In this mounted state, the clearance between the outer cylinder and the stopper is set to be relatively small in the axial direction of the outer cylinder. For this reason, when the engine moves in the front-rear direction and the outer cylinder translates in the same direction during acceleration / deceleration, the outer cylinder is brought into contact with one side surface of the stopper with a slight displacement. Then, after the stopper is further pushed and elastically deformed, the other side surface of the stopper is brought into contact with the bracket. Therefore, abrupt displacement of the outer cylinder is suppressed by the elastic force of the stopper, and the outer cylinder does not directly hit the bracket.

On the other hand, the clearance in the rolling direction of the outer cylinder is set larger than that in the axial direction. Therefore, when the engine rolls during acceleration and the outer cylinder rolls in the same direction, a large displacement is required before the outer cylinder hits one side surface of the stopper.
The outer cylinder is less likely to hit the stopper accordingly. Further, as a result, the outer cylinder is less likely to hit the bracket through the stopper. Therefore, it is less likely that the vibration of the engine is transmitted to the vehicle body through the outer cylinder, the stopper and the bracket.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the engine mount of the present invention will be described in detail below with reference to FIGS.

FIG. 1 is a sectional view showing a cylindrical engine mount 1 in this embodiment, and FIGS. 2 and 3 are sectional views showing the operation of the engine mount 1. The engine mount 1 includes an outer cylinder 2 and an inner cylinder 3 arranged on the same axis, and a vibration-proof rubber 4 as an elastic body is interposed between the outer cylinder 2 and the inner cylinder 3. On the other hand, a pair of brackets 6 are erected on the side member 5 of the vehicle body. Then, the outer cylinder 2, the inner cylinder 3, and the anti-vibration rubber 4 are arranged between both brackets 6 located on both sides in the axial direction thereof.
That is, each bracket 6 is formed with a hole 6a, and both ends of the inner cylinder 3 are aligned with each hole 6a. Then, the nut 8 is screwed into the bolt 7 inserted into the hollow 3a of the inner cylinder 3 and each hole 6a and tightened, whereby the outer cylinder 2, the inner cylinder 3 and the vibration-proof rubber 4 are integrally formed. Are connected between. In this connected state, the brackets 6 restrict the axial movement of the outer cylinder 2 with respect to the inner cylinder 3. A pair of elastic stoppers 9 formed of rubber in a flat plate shape are arranged between each bracket 6 and both ends of the outer cylinder 2 and the vibration isolating rubber 4 in the axial direction. The outer diameter of each of these elastic stoppers 9 is set to be slightly larger than that of the outer cylinder 2, and is fixed to the outer periphery of the inner cylinder 3 at the center thereof. Then, when the outer cylinder 2 translates in the axial direction S, the outer cylinder 2 can come into contact with the elastic stopper 9.

FIG. 4 shows an arrangement state of the engine 12 supported by the engine mount 1 and other engine mounts 10 and 11 in this embodiment. The engine 12 is arranged horizontally so that its longitudinal direction is aligned with the left-right direction of the vehicle body. A bracket 13 is fixed to one right end of the engine 12, and the engine mount 1 is connected to the bracket 13. Here, the bracket 13 is connected to the outer cylinder 2 of the engine mount 1. Further, the inner cylinder 3 is connected to both brackets 6 of the side member 5 by bolts 7 and nuts 8.

In this connected state, the longitudinal direction of the engine 12 is aligned with the axial direction of the engine mount 1. Thus, as shown in FIG. 4, the movement of the engine 12 in the front-rear direction FR at the time of acceleration / deceleration of the vehicle is matched with the movement of the outer cylinder 2 in the axial direction S as shown in FIGS. Has become. Further, in this connected state, as shown in FIG. 4, the rolling direction (rolling direction) R of the engine 12 generated during acceleration of the vehicle is aligned with the rolling direction r of the outer cylinder 2 of the engine mount 1 and the antivibration rubber 4. It is supposed to do.

Similarly, other engine mounts 10, 11
Is the bracket 1 for the rear and left side of the engine 12.
They are attached via 4 and 15, respectively. Moreover, these engine mounts 10 and 11 are connected to the vehicle body.

In view of the above-mentioned arrangement of the engine 12 and the engine mount 1, clearances C1 and C2 between the outer cylinder 2 and the elastic stopper 9 of the engine mount 1 are set. That is, as shown in FIG. 1, in this embodiment, both ends in the axial direction of the outer cylinder 2 are formed so as to be inclined with respect to the axial direction. As a result, an extremely small clearance C1 is set between the elastic stopper 9 and the front end upper portion 2a and the rear end lower portion 2b in the axial direction of the outer cylinder 2. On the other hand, a large clearance C2 is set between the elastic stopper 9 and the front lower end 2c and the rear upper end 2d in the axial direction of the outer cylinder 2. In addition, the clearance C2 in the rolling direction r of the outer cylinder 2 and the antivibration rubber 4 due to the rolling of the engine 12 during acceleration is set to be larger than the clearance C2 of the outer cylinder 2 in the axial direction S. In this embodiment, the clearance C2 in the rolling direction r is set to be somewhat larger than the horizontal displacement of the average roll angle of the engine 12 during acceleration.

Next, the operation of the engine mount 1 configured as described above will be described. Now, when the engine 12 moves forward with respect to the vehicle body during deceleration of the vehicle, the outer cylinder 2 of the engine mount 1 translates forward, that is, forward in the axial direction S. Then, the outer cylinder 2 and the elastic stopper 9
Since the clearance C1 between the outer cylinder 2 and the outer cylinder 2 is set to be relatively small, the outer cylinder 2 is slightly displaced in the axial direction S,
The front end upper portion 2a immediately contacts one side surface of the elastic stopper 9. When the outer cylinder 2 is further displaced in the axial direction S, the elastic stopper 9 is further pushed by the front end upper portion 2a of the outer cylinder 2 as shown in FIG. 6 is abutted. Further, the lower portion 2c of the front end of the outer cylinder is also brought into contact with the elastic stopper 9.

Therefore, the engine 12 is thus decelerated.
In the case where the outer cylinder 2 moves in the forward direction, the elastic force of the elastic stopper 9 suppresses the sudden displacement of the outer cylinder 2 and also reduces the feeling of contact of the outer cylinder 2 with the bracket 6.
As a result, the deceleration shock felt in the vehicle can be appropriately mitigated.

Similarly, when the engine 12 moves rearward during acceleration of the vehicle, the outer cylinder 2 of the engine mount 1 is translated rearward, that is, rearward in the axial direction S, contrary to the above. become. Then, the outer cylinder 2 is slightly displaced in the axial direction S, and the lower portion 2b of the rear end immediately receives the elastic stopper 9.
Is abutted on one side. Alternatively, when the outer cylinder 2 is largely displaced in the axial direction S, the elastic stopper 9 is further pushed by the lower rear end 2b, and the other side surface of the stopper 9 is brought into contact with the bracket 6 while elastically deforming.

Therefore, the engine 12 is thus accelerated during acceleration.
Even when the vehicle moves rearward, the elastic stopper 9 softens the sudden displacement of the outer cylinder 2 and the hit feeling of the outer cylinder 2 against the bracket 6, and the acceleration shock felt in the vehicle can be suitably mitigated. .

On the other hand, when the engine 12 rolls during acceleration of the vehicle, the outer cylinder 2 of the engine mount 1 also rolls in the same direction. The clearance C2 in the rolling direction r between the outer cylinder 2 and the elastic stopper 9 is set to be larger than the clearance C1 in the axial direction S. Therefore, a large displacement is required until the front end lower portion 2c and the rear end upper portion 2d of the outer cylinder 2 hit one side surface of each elastic stopper 9, and the outer cylinder 2 is less likely to hit the elastic stopper 9 accordingly. That is, as shown in FIG. 3, even if the outer cylinder 2 is displaced in the rolling direction r, the lower front end 2c and the upper rear end 2d of the outer cylinder 2 are less likely to hit the elastic stoppers 9. Further, along with this, the outer cylinder 2 is less likely to hit the bracket 6 via each elastic stopper 9.

Therefore, the engine 12 is thus accelerated during acceleration.
When the rolling occurs, the outer cylinder 2 is less frequently contacted with the elastic stopper 9 and the bracket 6,
Vibrations of the engine 12 are less likely to be transmitted to the vehicle body through the outer cylinder 2, the elastic stopper 9 and the bracket 6.
As a result, vibration transmission from the engine 12 to the vehicle body can be reduced by the amount of rolling of the engine 12 during acceleration, and the vibration noise felt in the vehicle can be reduced.

That is, the engine mount 1 of this embodiment
According to this, it is possible to achieve both the mitigation of the motion impact caused by the longitudinal movement of the engine 12 during acceleration / deceleration, and the reduction of the vibration transmission caused by the rolling of the engine 12 during acceleration. is there.

In addition, minute vibrations generated in the engine are damped by the vibration isolating rubber 4 of the engine mount 1 when idling or when the vehicle runs at a constant speed. Therefore, it is possible to prevent the minute vibration from being transmitted from the engine to the vehicle body.

The present invention is not limited to the above-described embodiments, but may be implemented as follows with a part of the configuration appropriately modified without departing from the spirit of the invention. (1) In the above embodiment, a simple flat plate-like elastic stopper 9 is used.
However, the shape of the elastic stopper may be changed appropriately.

For example, as shown in FIG. 5, a large diameter portion 16a having an outer diameter slightly larger than the outer diameter of the outer cylinder 2, and the outer cylinder 2
You may provide the elastic stopper 16 which consists of the small diameter part 16b which has an outer diameter a little smaller than the outer diameter. In this case, due to the difference in elastic force between the large-diameter portion 16a and the small-diameter portion 16b, the elastic stopper 16 undergoes elastic deformation in multiple stages, and a feeling of contact when the outer cylinder 2 contacts the bracket 6 via the elastic stopper 16. Therefore, the acceleration / deceleration shock felt in the vehicle can be further suitably alleviated.

(2) In the above embodiment, the clearance C2 in the rolling direction r is changed to the clearance C1 in the axial direction S by the elastic stopper 9 having a simple flat plate shape and the outer cylinder 2 in which both ends in the axial direction S are inclined. Set larger than. On the other hand, as shown in FIG. 6, by the outer cylinder 17 having a vertical shape in which both ends in the axial direction S are not inclined, and the elastic stopper 18 including the deformed large diameter portion 18a and the deformed small diameter portion 18b, The clearance C2 in the rolling direction r may be set larger than the clearance C1 in the axial direction S. That is, the shapes of the outer cylinder and the elastic stopper can be appropriately changed in order to set the clearance between the outer cylinder and the elastic stopper.

[0027]

As described in detail above, according to the present invention, a pair of brackets for restricting the axial movement of the outer cylinder with respect to the inner cylinder, and between each bracket and the outer cylinder and the elastic body are provided. The outer cylinder is provided with a stopper made of an elastic body that can come into contact when the body moves in translation in the axial direction, and is interposed between the longitudinal end of the engine and the vehicle body to align the axial direction with the longitudinal direction of the engine. Regarding the clearance between the outer cylinder and the stopper in the engine mount, the clearance in the rolling direction of the outer cylinder due to the rolling of the engine during acceleration was set larger than the clearance in the axial direction of the outer cylinder. When the outer cylinder is translated and moves in the same direction in translation, abrupt displacement of the outer cylinder is suppressed, and the outer cylinder does not directly contact the bracket.
Further, when the engine rolls during acceleration and the outer cylinder rolls in the same direction, the outer cylinder hardly hits the stopper and the bracket. As a result, there is an excellent effect that it is possible to both reduce the motion impact caused by the longitudinal movement of the engine and reduce the vibration transmission caused by the rolling of the engine.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an engine mount in an embodiment embodying the present invention.

FIG. 2 is a cross-sectional view showing the action of the engine mount when the engine moves forward during deceleration in one embodiment.

FIG. 3 is a cross-sectional view showing the action of the engine mount when the engine rolls during acceleration in one embodiment.

FIG. 4 is a perspective view showing an arrangement state of an engine supported by an engine mount in one embodiment.

FIG. 5 is a sectional view showing an engine mount in another embodiment embodying the present invention.

FIG. 6 is a sectional view showing an engine mount in another embodiment embodying the present invention.

FIG. 7 is a cross-sectional view showing a conventional engine mount.

[Explanation of symbols]

2 ... Outer cylinder, 3 ... Inner cylinder, 4 ... Anti-vibration rubber as main body elastic body, 5 ... Side member as vehicle body, 6 ... Bracket,
9 ... Elastic stopper, 12 ... Engine, 16 ... Elastic stopper, 17 ... Outer cylinder, 18 ... Elastic stopper, S ... Axial direction, r
… Rolling direction, C1, C2… Clearance.

Claims (1)

[Claims] 1. An outer cylinder and an inner cylinder arranged on the same axis, a main body elastic body interposed between the outer cylinder and the inner cylinder, the outer cylinder, the inner cylinder, and the main body. A pair of brackets provided on both sides of the elastic body in the axial direction to restrict axial movement of the outer cylinder with respect to the inner cylinder, and between the brackets and both ends of the outer cylinder and the main body elastic body in the axial direction. Provided with a stopper made of an elastic body that can come into contact when the outer cylinder makes a translational movement in its axial direction, and is interposed between the longitudinal end of the engine and the vehicle body,
In an engine mount arranged with its axial direction aligned with the front-rear direction of the engine, with respect to the clearance between the outer cylinder and the stopper, a clearance in the rolling direction of the outer cylinder due to rolling of the engine during acceleration is set. The engine mount is set to be larger than the axial clearance of the outer cylinder.