JPH06109050A - Engine mount - Google Patents

Abstract

PURPOSE:To reduce the transmission of vibration from an engine to a car body and improve the stopper function of a stopper, when an outer cylinder and the stopper contact. CONSTITUTION:An engine mount 1 is constituted so that a vibrationproof rubber 4 is interposed between an outer cylinder 2 and an inner cylinder 3 and a pair of brackets 6 are installed on both the edges of the outer cylinder 2, inner cylinder 3, and the vibrationproof rubber 4, and an elastic stopper 9 which can contact when the outer cylinder 2 is shifted in the axial direction S is installed between both the edges of the bracket 6, outer cylinder 2, and the vibrationproof rubber 4, and an engine mount 1 is interposed between the engine and a car body, and formed to a honeycomb shape by regularly forming a number of hexagohal through holes 9a on the whole surface of the elastic stopper 9. Accordingly, the spring constant of the elastic stopper 9 can be reduced, and the elastic stopper 9 having high rigidity can be used, and the slastic stopper 9 develops the sufficient stopper function. Further, since the spring constant is reduced, the transmission of the vibration of the engine to the car body can be suppressed, even in the state where the outer cylinder 2 and the elastic stopper 9 contact.

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 interposed between an engine and a vehicle body and is used as a vibration proof measure when the engine is mounted on a vehicle or the like.

[0002]

2. Description of the Related Art Heretofore, as this type of technique, one disclosed in Japanese Utility Model Laid-Open No. 60-118047 has been known. In this conventional engine mount, as shown in FIG. 4, an elastic body 23 made of rubber is interposed between an outer cylinder 21 and an inner cylinder 22. Further, a pair of brackets 25 are erected and fixed on a lower plate 24 fixed to an engine room of a vehicle body (not shown).
The outer cylinder 21, the inner cylinder 22, and the elastic body 23 are connected to each other via bolts 26 and nuts 27. Outer cylinder 21
An arm 28 is welded and fixed to the outer peripheral surface of the arm 2.
An upper plate 29 connected to an engine (not shown) is formed at the tip of 8. Flat elastic stoppers 30 are fitted to both ends of the inner cylinder 22 so as to be located between both ends of the outer cylinder 21 and the bracket 25.

Since the engine is supported by the vehicle body via the engine mount, the vibration of the engine is prevented from being attenuated by the elastic body 23 and transmitted to the vehicle body. Further, when the outer cylinder 21 is displaced in the axial direction S following the movement of the engine during acceleration / deceleration of the vehicle, the outer cylinder 21 is received by the bracket 25 via the elastic stopper 30. Therefore, the elastic stopper 30 prevents the outer cylinder 21 and the bracket 25 from directly interfering with each other, and the bending of the stopper 30 softens the contact feeling between the outer cylinder 21 and the bracket 25. Therefore, generation of an interference sound due to direct interference between the outer cylinder 21 and the bracket 25 is prevented, and an acceleration / deceleration shock felt in the vehicle is mitigated.

Further, since the outer cylinder 21 repeatedly and violently interferes with the bracket 25 through the elastic stopper 30, the outer cylinder 2
Elastic stopper 30 located between 1 and the bracket 25
Is easily fatigued and deteriorated. In order to prevent this, in this conventional engine mount, the elastic stopper 30 is configured by sandwiching a chemical fiber 32 such as nylon as a reinforcing material between soft rubbers 31.
As a result, the durability is improved without increasing the thickness of the elastic stopper 30 itself, and the performance thereof is maintained for a long period of time.

[0005]

However, in the above-mentioned prior art, since the elastic stopper 30 is constituted by sandwiching the chemical fiber 32 between the soft rubbers 31, its hardness becomes high and its spring constant becomes large. Therefore, the vibration transmissibility of the stopper 30 increases. Therefore, when the outer cylinder 21 is in contact with the elastic stopper 30, or when the outer cylinder 21 is received by the bracket 25 via the elastic stopper 30, the engine vibration is easily transmitted from the engine mount to the vehicle body. Become. Therefore, the vibration noise that can be felt in the vehicle increases correspondingly, and the NVH (Noi
se, Vibration, and Harshness) There was a risk that the performance would deteriorate.

However, if the elastic stopper 30 is made soft in order to reduce the spring constant of the elastic stopper 30, the elastic stopper 30 is apt to deteriorate as described above.
Its durability is reduced. In addition, when the outer cylinder 21 is abruptly displaced following the movement of the engine during acceleration / deceleration of the vehicle, the elastic stopper 30 reliably suppresses the abrupt displacement of the outer cylinder 21, that is, the abrupt movement of the engine. Can't do it. That is, a new problem occurs that the stopper performance of the elastic stopper 30 is deteriorated, which leads to deterioration of drivability (feeling of whether or not the vehicle shows responsiveness according to the will of the driver).

To solve this, the elastic stopper 3
It is conceivable to use a thick one as 0, but in such a case, the size of the entire mount naturally becomes large, and the space efficiency in the engine room deteriorates.

Moreover, since the conventional elastic stopper 30 has a simple flat plate shape, it has a small surface area and cannot efficiently dissipate heat received from the engine. Therefore, there is also a problem that the conventional elastic stopper 30 is deteriorated early by heat.

The present invention has been made to solve the above problems, and an object thereof is to reliably reduce the vibration transmission from the engine to the vehicle body and to improve the stopper performance of the stopper. Another object of the present invention is to provide an engine mount that can be manufactured, has excellent durability, and is not likely to become large.

[0010]

In order to achieve the above object, according to the present invention, an inner cylinder and an outer cylinder, an elastic body interposed between the inner cylinder and the outer cylinder, and the outer cylinder. And a pair of brackets provided on both sides of the inner cylinder in the axial direction to restrict axial movement of the inner cylinder, and provided between the brackets and both ends of the outer cylinder in the axial direction. In an engine mount that is provided with a stopper made of an elastic material that can abut when moving, and at least one side surface of the stopper is formed in a honeycomb shape in the engine mount interposed between the engine and the vehicle body.

[0011]

Therefore, according to the present invention, when the engine moves and the outer cylinder moves in the axial direction during acceleration and deceleration, the outer cylinder is received by the bracket through the stopper made of an elastic material. To be Therefore, the sudden displacement of the outer cylinder is suppressed by the bending of the stopper.

Further, since at least one side surface of the stopper is formed in a honeycomb shape, the capacity of the stopper as a whole can be reduced and the weight can be reduced as compared with a solid body, and the spring constant can be increased. Can be reduced. Therefore, a highly rigid stopper can be used, and the durability of the stopper can be improved. Then, even if the stopper receives a pressing load from the outer cylinder, the pressing load is reliably received by the honeycomb-shaped portion, and sufficient stopper performance and cushioning action are exhibited. Further, since the spring constant is small, the vibration transmission rate of the stopper is low, and even if the outer cylinder and the stopper are in contact with each other, the vibration of the engine is less likely to be transmitted to the vehicle body. Further, when the stopper is formed in a honeycomb shape, the contact area with the outside air is increased, so that the heat radiation effect is enhanced, the heat received from the engine can be efficiently released, and the deterioration of the stopper due to the heat is prevented.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the engine mount of the present invention will be described in detail below with reference to FIGS. 1 and 2.

1 and 2 are an exploded perspective view and a sectional view showing a cylindrical engine mount 1 in this embodiment, respectively. The engine mount 1 includes a cylindrical 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 and fixed between the outer cylinder 2 and the inner cylinder 3. . On the other hand, a pair of brackets 6 are vertically fixed to a lower plate 5 fixed to an engine room of a vehicle body (not shown).

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 has a through hole 6a.
Are formed, and the inner cylinder 3 is arranged so that the openings at both ends of the inner cylinder 3 coincide with the through holes 6a. Then, the inner cylinder 3 is supported between the brackets 6 so as to be immovable in the axial direction by screwing the nut 8 into the bolt 7 inserted through the hollow 3 a of the inner cylinder 3 and the through holes 6 a and tightening the nut 8. . In this state, both brackets 6 restrict the movement of the inner cylinder 3 in the axial direction S.

A pair of elastic stoppers 9 formed of rubber in a substantially disk 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 diameters of these elastic stoppers 9 are set to be slightly larger than those of the outer cylinder 2, and are fixed to the outer circumferences of both ends of the inner cylinder 3 at the center thereof. When the outer cylinder 2 is displaced in the axial direction S, the outer cylinder 2 can contact the elastic stopper 9.

A large number of hexagonal through holes 9a are regularly formed on the entire surface of the elastic stopper 9 to form a honeycomb shape. Therefore, when the outer cylinder 2 is displaced in the axial direction S, the outer cylinder 2 comes into contact with the honeycomb surface of the elastic stopper 9.

An arm 10 is welded and fixed to the outer peripheral surface of the outer cylinder 2, and an upper plate 11 connected to an engine 12 is fixedly attached to the tip of the arm 10. Although not shown, in this embodiment, the engine mount 1 is
It supports one or both of the right side end and the left side end of the engine 12. Further, the engine 12 is arranged horizontally such that the longitudinal direction of its crankshaft is the left-right direction of the vehicle body. The movement of the engine 12 in the front-rear direction with respect to the vehicle body during acceleration / deceleration of the vehicle is matched with the movement of the outer cylinder 2 in the axial direction S, as shown in FIG.

Next, the operation of the engine mount 1 constructed as described above will be described. Now, during idling or when the vehicle runs at a constant speed, small vibrations generated by the engine 12 are damped by the vibration-proof rubber 4 of the engine mount 1. Therefore, it is possible to prevent the minute vibration from being transmitted from the engine 12 to the vehicle body.

When the engine 12 moves rearward or forward with respect to the vehicle body during acceleration or deceleration of the vehicle, for example, the outer cylinder 2 of the engine mount 1 resists the elasticity of the antivibration rubber 4 and is shown in FIG. It will be displaced in one or the other of the axial directions S. Then, one end of the outer cylinder 2 is brought into contact with 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 pressed by one end of the outer cylinder 2 as shown by the chain line in FIG. The side surface contacts the bracket 6 and is received.

Therefore, when the engine 12 moves in the front-rear direction during acceleration / deceleration, the elastic stopper 9 is used.
The bending of the outer cylinder 2 suppresses abrupt displacement of the outer cylinder 2 and softens the outer cylinder 2 against the bracket 6. As a result, the acceleration / deceleration shock felt in the vehicle can be appropriately mitigated. In addition, since the elastic stopper 9 prevents the outer cylinder 2 and the bracket 6 from directly interfering with each other, it is possible to prevent the occurrence of an interference sound due to the direct interference between the outer cylinder 2 and the bracket 6.

Further, in this embodiment, since the elastic stopper 9 has a honeycomb shape, the capacity of the elastic stopper 9 as a whole can be reduced and the weight can be reduced as compared with the solid stopper. .

Further, since the elastic stopper 9 has a honeycomb shape, the spring constant can be reduced. Therefore, a rubber having a high rigidity can be used as the elastic stopper 9. Therefore, the engine 1 at the time of acceleration / deceleration described above is
Even if the elastic stopper 9 receives a pressing load from the outer cylinder 2 when the outer cylinder 2 is rapidly displaced following the movement of the second cylinder 2, the elastic stopper 9 reliably receives the pressing load on the honeycomb surface, thereby providing sufficient stopper performance. Since it is demonstrated, drivability can be improved.

In addition, since the elastic stopper 9 having high rigidity can be used, the elastic stopper 9 can be excellent in heat resistance and durability.
It is not necessary to use a thick elastic stopper 9, which contributes to downsizing of the engine mount.

Further, since the elastic stopper 9 is formed in a honeycomb shape and the spring constant is small, the vibration transmissibility of the stopper 9 is low. Therefore, the outer cylinder 2 is in contact with the elastic stopper 9 or the outer cylinder 2 is in contact with the elastic stopper 9.
The vibration of the engine 12 is sufficiently damped by the elastic stopper 9 even when the vibration is in contact with the bracket 6 via the. Therefore, the vibration of the engine 12 is less likely to be transmitted to the vehicle body, and the vibration noise felt in the vehicle is reduced, and the NVH is reduced.
The performance can be improved.

That is, in the engine mount 1 of this embodiment, by forming the elastic stopper 9 into a honeycomb shape, it is possible to improve both drivability and the contradictory performance of NVH.

In addition, when the elastic stopper 9 is formed in a honeycomb shape, the contact area with the outside air is increased, so that the heat dissipation effect is enhanced. Therefore, the heat received from the engine 12 can be efficiently dissipated, and early deterioration of the elastic stopper 9 due to heat can be prevented.

The present invention is not limited to the above-mentioned embodiment, but can be implemented as follows by appropriately modifying a part of the configuration without departing from the spirit of the invention. (1) In the above-described embodiment, the elastic stopper 9 is formed in a substantially disc shape, but it may be formed in a substantially fan shape as shown in FIG. 3 according to the shape of the fan-shaped outer cylinder 2, for example. , Change to another shape. (2) A plurality of hexagonal recesses are formed on the contact surface of the elastic stopper 9 with the outer cylinder 2 so that the contact surface has a honeycomb shape. (3) On the surface of the elastic stopper 9 facing the bracket 6,
Forming a large number of hexagonal concave portions so that the opposing surfaces have a honeycomb shape. (4) Arrange the elastic stopper 9 in a state of being attached to the inner surface of the bracket 6.

[0029]

As described in detail above, according to the present invention, since the stopper is formed in a honeycomb shape, the capacity of the stopper as a whole can be reduced as compared with a solid body, and the weight of the stopper can be reduced. And the spring constant can be reduced. Therefore, a highly rigid stopper can be used, which not only improves the durability of the stopper but also contributes to downsizing of the mount. Then, even if the stopper receives a pressing load from the outer cylinder when the outer cylinder is suddenly displaced following the movement of the engine, the stopper surely receives the pressing load in the honeycomb-shaped portion, and the stopper is sufficient. Demonstrate performance.
Therefore, the sudden movement of the engine can be surely suppressed by the stopper, and the excellent effect that the drivability can be improved is exhibited. Further, since the spring constant is small, the vibration transmission rate of the stopper is low, and even if the outer cylinder and the stopper are in contact with each other, the vibration of the engine is less likely to be transmitted to the vehicle body, and the NVH performance can be improved. Exert the effect. Furthermore, since the contact area with the outside air is increased, the heat dissipation effect is enhanced, the heat received from the engine can be efficiently released, and the stopper can be prevented from prematurely deteriorating.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of an engine mount embodying the present invention.

FIG. 2 is a cross-sectional view showing an engine mount.

FIG. 3 is a perspective view showing another example of the elastic stopper.

FIG. 4 is a cross-sectional view showing a conventional engine mount.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Engine mount, 2 ... Outer cylinder, 3 ... Inner cylinder, 4 ... Vibration-proof rubber as an elastic body, 5 ... Lower plate fixed to a vehicle body, 6 ... Bracket, 9 ... Elastic stopper, 12 ... Engine, S ... Axial direction.

Claims (1)

[Claims] 1. An inner cylinder and an outer cylinder, an elastic body interposed between the inner cylinder and the outer cylinder, and axially opposite sides of the outer cylinder and the inner cylinder. A pair of brackets that restrict movement, and a stopper that is provided between each of the brackets and both axial ends of the outer cylinder and is made of an elastic material that can come into contact when the outer cylinder moves in the axial direction, In the engine mount interposed between the engine and the vehicle body, at least one side surface of the stopper is formed in a honeycomb shape.