JPH03249438A - Engine support device - Google Patents

Abstract

PURPOSE:To make sufficient vibration absorbency compatible with stopper property by changing hardness of side stopper body in which the inside forms stepped circle having small diameter in comparison with hardness of bushing proper which is located between them. CONSTITUTION:A side stopper body 15 is mounted on a bushing 14. The side stopper body 15 is mounted on both sides of an axial section 17 and on the inside of a bracket 5. The inside part has a small diameter section 15b and stepped shape in comparison with large diameter section 15a of the outside part. When vibration increases, the side stopper body 15 functions, causing the hardness of the side stopper body 15 suitable to it. Also, since vibration is absorbed by a bushing proper 16, its hardness is made suitable for this purpose. Thus, it is possible to make sufficient vibration absorbency compatible with stopper property.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an engine support device that is applied to a portion of an automobile body in which an engine is mounted.

(Prior art) Since a car engine generates vibrations, a bushing is used to attach it to the car body, and the bushings absorb the generated vibrations (as an example, this is a practical example).
(See Publication No. 8752, etc.).

The directions of vibrations absorbed by the bushings include the front-rear direction (X direction), the left-right direction (Y direction), and the vertical direction (two directions) shown in Fig. 15.The bushings dampen the vibrations generated by the engine and The engine has the function of reducing vibration and noise, but when the engine is displaced or shakes due to a sudden start, a stopper is required to minimize this. This point will be explained in detail later.

FIG. 5 shows the relationship between the automobile 1 and the engine 3 mounted in the engine room 2 thereof. In the case of this automobile 1, the engine 3 is mounted in the engine room 2 at the position rR, and is attached to the vehicle body via a bush 4. The bushing 4 functions to absorb vibrations generated by the engine 3 and prevent them from being transmitted to the vehicle body. Figure 6 is Bush 4
It shows in detail.

As shown in this figure, the bushing 4 is roughly composed of a mouth-shaped bracket 5 and a bush main body 7 which is pivotally attached to the opening of the bracket 5 with a shaft 6. An arm 8 is attached to the bush main body 7, and this arm 8 is fixed to the engine 3 side, and the mating bracket 5 is fixed to the vehicle body side. Due to this structure, the vibrations generated by the engine 3 act on the bushing body 7 as a torsional force, and most of the vibrations are absorbed here.

Next, each of the conventional structures of the bushing 4 will be explained. First of all, what is shown in Figures 7 and 8 is a mouth-shaped bracket).
The outer part of the shaft 9 of the bushing body 7 supported by the shaft (bolt) 9 and the nut 10 in the bushing body 5 is provided with a hole H, 12 having a letter-shaped cross section as shown in FIG. The wall thickness of the portion 7a sandwiched between the holes 12 is made thinner. As shown in FIG. 8, the thickness of the bushing main body 7 is widened on the inside of the cylindrical body 13 to which the outer periphery of the bushing main body 7 is connected.

In the boot 7 4 having this structure, when used with the direction 1lI9 facing the longitudinal direction of the automobile, the wide inner part of the cylindrical body 13 functions as a stopper in the longitudinal force direction, and the surrounding part of the shaft 9 However, the function of the stopper in the downward direction, left/right direction, and rotational force direction is no longer fulfilled. And meat lol
- Acts as a partial diurnal motion absorption that is a thinner version of the method. The ones shown in FIGS. 9 and 10 are also almost the same as those shown in FIGS. 7 and 8, but the holes 11 and 12 of the bushing body 7 are
There is no thin part between the
It performs similar functions.

Therefore, as shown in FIGS. 11 and 12, the part of the bushing body 7 that functions as a stopper (the part indicated by the reference numeral 7d) may be made independent from the other parts (the part indicated by the reference numeral 7). Conceivable. In the illustration, the code is 7d.
1 is an arcuate tongue-shaped portion, which is independent of the cylindrical portion 7. No. ``i'' As shown in the figure, by rubbing two of these old 1-shaped objects facing each other,
This means that it can have a stopper function against loads in the C and M directions. What is shown in FIGS. 13 and 14 is still another example of the prior art. In this case, a protruding stopper 7b is attached to the upper part F2 of the inside of the cylindrical body 13, and when the bushing body 7 located around the shaft 9 is displaced downwardly, for example, the button is pressed. When a load is applied to the bushing body 7, the space between the upper stopper 7b and the bushing body 7 opens, and the lower stator 2 buff b and the bushing body 7 come into contact with each other.

(Problems to be Solved by the Invention) In all of the conventional techniques described above, the material of the bushing body 7 is constant for each part, and therefore,
If the hardness of the bushing body 7 is increased in an attempt to improve the stopper effect when a load that causes movement beyond the compression stroke is applied to the bushing 4, the vibration absorption ability will be reduced. If the hardness of the bushing body 7 is made small in an attempt to increase the absorption capacity, a problem arises in that the stopper effect is reduced. So both of them
That is, in order to increase the vibration absorption ability and provide a sufficient stopper effect, the bushing body 7 is made to have a certain degree of hardness, and the portion sandwiched between the holes 11 and 12 is made to have a certain degree of hardness. a
Although it is possible to consider reducing the wall thickness (cross-sectional area) of A problem will also arise in that it will no longer be possible to obtain.

The present invention has been made in view of this point, and it is an object of the present invention to provide an engine support device that has both sufficient vibration absorbing properties and stopper properties.

(Means for solving problems) The present invention provides one step and I for solving the above problems.

In the automobile in which the engine is supported on the vehicle body through the bushes 14, the pushers and Li2 are provided on both sides of the shaft portion 17, and are circular side stiffener bodies with steps having a small diameter (small diameter portion 15b) on the inside. 15 and a bushing body 16 which is positioned with an interval dti between the side surface stopper bodies 15 on both sides, whose inner circumferential part is attached to the shaft part 17 and whose outer circumferential part is attached to the inner circumference of the cylindrical body 18. A hole 19.20 is formed in a part of the bush body 1B in a direction along the shaft portion 17,
Both ends of the cylindrical body 18 are made wider than the bush main body 16 and are exposed to the inside of the side stopper body 15.

(Function) With such a configuration, the hardness of the side stopper bodies 15 provided on both sides of the shaft portion 17 can be changed with respect to the hardness of the bushing body 16 located therebetween. Since the side stopper body 15 has a stepped circular shape with a small diameter on the inside, the function as a stopper can be obtained in all directions of the vehicle, including the front and back, left and right, up and down directions, and the rotational directions thereof. Become.

(Embodiment) Hereinafter, an embodiment of the present invention will be explained with reference to FIGS. In other words, the side stopper bodies 15 are installed on the inside of the bracket 5 on both sides of the shaft part, and the inner side is provided with the large diameter part 15a on the outer side. It has a stepped shape with a small diameter portion 15b. A bushing body 16 is provided between the side stopper bodies 15 with an interval d1.

This bush main body 16 is made of rubber that is softer than the side stopper body 15, and the inner peripheral part is attached to the shaft part (pipe for inserting the bolt as a shaft) 17, and the outer peripheral part is made of a metal cylinder. It is attached to the inner circumference of the body 18. The bushing body 16 is preferably attached to the shaft portion 17 and the cylindrical body 18 by shrink fitting or the like.
There are two holes in the direction along the shaft part 17! 8.20
is provided. Both ends of the cylindrical body 18 are wider than the bushing body 16, and the side stopper body 15 is wider than the bushing body 16.
(
(See Figure 3).

Although not shown in FIG. 3, this bushing 14 configured in this manner is constructed by inserting a port 9 as shown in FIGS. 8 and 10 into the shaft portion 17, and screwing a nut 10 thereto. It is used by being fixed to the vehicle body side, and the cylindrical body 18 is fixed to the engine side. When used in this way, within the normal vibration range until the bushing body 16 hits the side stopper body 15, the vibrations applied between the shaft portion 17 and the cylinder body 18 are absorbed by the holes 19 and 20 of the bushing body 16. It is absorbed by the deflection of the exposed part. When the vibration becomes large and it becomes necessary to stop the vibration to protect the bushing body 16, the side stopper body 15 prevents this.

When the vibration direction of the automobile is the left-right direction in Fig. 1 (the front-rear direction when attached to the automobile), the vertical direction in Fig. 3 (the upward-downward direction of the automobile), and the rotational direction of these directions, the cylindrical body Both end portions of the inner peripheral portion of the stopper body 18 contact the outer peripheral portion of the small diameter portion 15b of the side stopper body 15, thereby preventing vibration. Further, when the direction of vibration is the left-right direction in FIG. 3, both ends of the cylinder 18 protrude into the large diameter portion 15a of the side stopper body 15, thereby being blocked. When the vibration becomes large in this way, the side stopper body 15 functions, so this side stopper body 1
A hardness of 5 can be made suitable for this purpose. Also, since the original vibration absorption is done by the bushing body 16,
This hardness is suitable for that (side stopper body 15
hardness).

FIG. 4 shows a comparison between the bushing according to the present invention and the conventional bushing. That is, in the case of the present invention shown by ■ in Fig. 4, the change in the amount of deflection is gradual with respect to the change in load A during normal running, whereas the change in the amount of deflection is steep compared to this in the case of the conventional case shown by ■. 0 In the product of the present invention, when the deflection range exceeds the normal driving range, the stop/pa function is activated and the characteristics become steep, resulting in a difference from the conventional product as shown in B. . This is because in the conventional device, the stopper part used when the amount of vibration increases and the vibration must be stopped is the same part as the part that performs the vibration absorption function. This is because they are made of separate rubber bodies.

(Effects of the Invention) As described above, the present invention provides an automobile in which an engine is supported on a vehicle body through a bushing, in which the bushing is provided on both sides of a shaft portion and has a circular shape with a stepped portion having a small diameter on the inside. a bushing body positioned with a gap between the side stopper bodies on both sides, an inner circumferential part attached to the shaft part, and an outer circumferential part formed by a bushing body having claws on the inner circumference of a cylindrical body. , a hole is provided in a part of the bush body in a direction along the shaft,
Since both ends of the cylindrical body are made wider than the bushing body so as to face the steps of the side bushing body, the following effects can be achieved: ■ ■ ■ Improved vibration insulation performance and all. It is possible to simultaneously improve the restraint of engine displacement in the direction of . This reduces vehicle body vibration and indoor noise, and reduces damage to connecting piping caused by engine displacement.

It becomes possible to lower the spring constant while improving the durability of the mount HLJ.

By tuning the hardness of the side shock absorbers, it is possible to improve the shock and jittery sensations caused by sudden starts and braking, without sacrificing the reduction of vehicle body vibration and interior noise due to improved vibration isolation performance.

[Brief explanation of drawings]

Fig. 1 is a side view of a part of the bushing according to the present invention, Fig. 2 is a perspective view of the side stock and body used in combination with the bushing in Fig. 1, and Fig. 3 is a perspective view of the bushing as shown in Fig. 1. A cross-sectional view of the combination of tf and the one in Figure 2, Figure 4 is a graph comparing the performance of the present invention and the conventional one, and Figure 5 is an explanatory diagram showing the state in which the engine is mounted on a car. , FIG. 6 is a perspective view showing details of the bushing in FIG. 5, and FIG. 7 is a conventional pushbutton. 8 is a sectional view showing the overall S structure of the bushing shown in FIG. 7, and FIG. 9 is a sectional view of another example of the conventional bushing.
0 is a sectional view showing the overall structure of the bushing shown in FIG. 9, FIG. 1I is a sectional view of still another example of the conventional bushing, FIG. Figures 1 and 14 are cross-sectional views of still another example of a conventional bushing.
Figure 5 is Pushshi. FIG. 2 is an explanatory diagram showing the direction of vibrations that are applied to the device. ]4...Push 15...Side stopper body +5a...Large diameter part 15b...Small diameter part machining 6...Bouching body 17...Shaft part 18...Cylinder body 18.20 hole patent

Claims (1)

[Claims] (1) In an automobile in which the engine is supported on the vehicle body via a bush, the bush is provided on both sides of the shaft,
A side stopper body having a stepped circular shape with a small diameter on the inside and a space between the side stopper bodies on both sides, the inner circumference part being attached to the shaft part and the outer circumference part being attached to the inner circumference of the cylindrical body. A hole is formed in a part of the bush body in the direction along the shaft portion, and both ends of the cylinder body are made wider than the bush body and face the inside of the side stopper body. An engine support device characterized by: