JPS641567Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a shock absorber. Generally, when supporting an automobile engine on a vehicle body, a shock absorber is required to prevent sudden displacement of the engine due to vertical vibration, rolling, etc. of the engine. Particularly in front-wheel drive vehicles with a horizontally mounted engine, the engine mount bears the torque reaction force of the drive system, which increases engine displacement and tends to have a negative impact on strength and vibration and noise. As one of the countermeasures, an engine shock absorber (buffer rod) (the installation outline is shown in Fig. 1. 101 is an engine placed horizontally, 102 is a buffer rod, 1
03 is a bracket on the engine side, and 104 is a bracket on the vehicle frame side. ) is known, and its purpose is to connect the upper part of the engine to the vehicle body via a buffer rod and share the load caused by torque reaction force, etc., thereby suppressing the load and displacement of the engine mount body and improving durability. At the same time, the objective is to improve vehicle performance.

FIG. 2 shows an example of a conventional buffer rod 102. This buffer rod 102 is rod 1
05 has two shock absorbers at both ends. The shock absorber at the left end in FIG.
and an elastic member 4 made of rubber placed in an intermediate space between the members 3 and 3. This elastic member 4 has two wall-shaped legs 41 extending in the normal direction around the inner cylindrical fitting 3, and extends along the outer wall surface of the inner cylindrical fitting 3 almost parallel to the leg portions 41, and extends along the outer wall surface of the inner cylindrical fitting 3. arcuate outer circumferential portion 42 coupled to
and an arcuate inner circumferential portion 4 that extends along the inner wall surface of the outer cylindrical fitting 2 substantially parallel to the leg portion 41 and is coupled to the inner wall surface.
3 and more. This elastic member 4 is connected to the metal fittings 2 and 3.
It is vulcanized and molded in one piece. This inner cylindrical metal fitting 3 is fixed to a bracket 103 by a bolt inserted into its center hole and a nut tightening the bolt, and is supported by the engine via this bracket 103. On the other hand, the shock absorber on the right side in FIG. 2 is similarly supported by the vehicle body via bolts, nuts, and brackets 104. Vertical vibration of the engine (second
For vibrations in the direction of the arrow C-C′ shown in the figure, the second
In the shock absorber on the left side of the figure, vibrations are absorbed by the legs 41 of the elastic member 4. In response to lateral vibration (rolling) of the engine, the arcuate outer peripheral part 42 connected to the outer wall surface of the inner cylinder fitting 3 and the arcuate inner peripheral part 43 connected to the inner wall surface of the outer cylinder fitting 2 come into contact with each other. deforms under pressure and produces a vibration absorption effect.

Buffer rods are generally initial (low load area)
It is better that the static spring constant of is as small as possible, and it would be ideal if it could be made zero. By setting it to zero, the total spring constant of the engine mount support system can be kept low against engine lateral vibrations during idling. In addition, the engine mount body alone is suppressed to be small against displacement of the engine in a high load area such as when suddenly starting or stopping suddenly, and the cushioning performance and durability of the mount body are improved.

To this end, it is conceivable to separate and independently separate the inner cylindrical metal fitting 3 and the outer cylindrical metal fitting 2 and support the inner cylindrical metal fitting 3 without any load. However, with such a configuration, positioning is difficult when installing the engine, resulting in poor installation workability and unsatisfactory installation accuracy.

The present invention has been devised in view of the above circumstances, and provides a shock absorbing device that can separate and independently separate the inner cylinder fitting 3 and the outer cylinder fitting 2 while solving the problems of installation workability and installation accuracy. . By using this shock absorbing device, the initial static spring constant can be suppressed to almost zero, and the shock absorbing performance in high load areas can be improved.

That is, the shock absorber of the present invention includes an outer member having a hole defined by an inner circumferential wall with a circular cross section and is supported by one object, and is supported by another object and is arranged at the center of the hole of the outer member. an inner member having an outer peripheral wall with a circular cross section; an outer cylindrical part joined to the inner peripheral wall of the outer member; an inner cylindrical part joined to the outer peripheral wall of the inner member; the outer cylindrical part and the inner cylindrical part. The outer member is attached to one object without cutting the connecting part, and the inner member is attached to another object, and after attachment, the connecting part is It is characterized by cutting.

In the shock absorber of the present invention, for example, the shock absorber is installed between the engine and the vehicle body like a conventional buffer rod, the relative position of the outer member and the inner member is fixed, and then the connecting portion of the elastic member is cut, and the shock absorber is mounted between the engine and the vehicle body. The part of the shock absorber attached to the engine side (e.g., the outer member) and the part of the shock absorber attached to the vehicle body (e.g., the inner member) are completely separated, and the initial static spring constant of the shock absorber is reduced to substantially zero. It is.

Hereinafter, embodiments of the present invention will be described based on the drawings. Note that the same parts will be explained using the same reference numerals.

3 and 4 are a cross-sectional view and a vertical cross-sectional view of a shock absorber according to an embodiment of the present invention. The shock absorber of this embodiment includes a large cylindrical outer metal fitting 2 which is an outer member supported by the vehicle body, a small cylindrical inner metal fitting 3 which is an inner member supported by the engine, and an elastic member made of rubber. It consists of 1. The inner cylindrical metal fitting 3 is arranged concentrically along the central axis of the outer cylindrical metal fitting 2. The elastic member 1 includes an outer cylindrical part 11 with a large diameter, an inner cylindrical part 12 with a small diameter located concentrically with the outer cylindrical part 11, and columnar parts arranged at equal intervals connecting these cylindrical parts 11 and 12. 4
The connecting portion 13 is made up of two connecting portions 13. This elastic member 1 is integrally vulcanized. Further, the outer circumferential surface of the outer cylindrical portion 11 of the elastic member 1 and the inner circumferential wall surface of the outer cylindrical fitting 2 are bonded by vulcanization, and the inner circumferential surface of the inner cylindrical portion 12 and the outer circumferential wall surface of the inner cylindrical fitting 3 are bonded together. Vulcanized adhesive. The thickness of the connecting portion 13 of the elastic member 1 is 3 mm, and the thickness is such that it can be easily cut with a knife. The outer cylindrical metal fitting 2 is press-fitted into the bracket 5 and fixed. The outer cylindrical metal fitting 2 is supported by the vehicle body via a bracket 5. The inner cylindrical metal fitting 3 is longer than the outer cylindrical metal fitting 2 and the elastic member 1 in the axial direction, and its both ends protrude from the outer cylindrical metal fitting 2 and the elastic member 1. A disk-shaped flange 6 having a center hole is inserted and fixed into the protruding portions at both ends. Inner cylinder metal fitting 3
A fixing bolt (not shown) to be coupled to the engine is inserted into the center hole of the inner cylinder fitting 3, and the fixing bolt and the inner cylinder fitting 3 are coupled by tightening with a nut (not shown). Note that the flange 6 is a kind of protective equipment.
This prevents the component parts on the engine side from coming into contact with the outer cylindrical part 11 of the elastic member 1 and damaging the outer cylindrical part 11. This shock absorber is installed between the engine, which is swingably fixed by the engine mount body, and the vehicle body. Thereafter, the connecting portion 13 of the elastic member 1 is cut, and the inner cylindrical portion 12 and the outer cylindrical portion 11 of the elastic member 1 are separated and independent as shown in FIG. In this case, the connecting portion 13 may be left as a remaining portion 13'.

As a result of the inner cylindrical portion 12 and the outer cylindrical portion 11 being separated and independent, there is no load until the outer circumferential surface 12a of the inner cylindrical portion 12 contacts the inner circumferential surface 11a of the outer cylindrical portion 11. That is, if the amount of displacement between the center of the inner cylindrical part 12 and the center of the outer cylindrical part 11 is δmm, and the load acting between the outer cylindrical fitting 2 and the inner cylindrical fitting 3 of this shock absorber is PKg, then as shown in FIG. As shown in the graph shown, the load becomes zero until the outer circumferential surface 12a of the inner cylindrical portion 12 contacts the inner circumferential surface 11a of the outer cylindrical portion 11. The initial static spring constant (low load area) of the entire engine mount is correspondingly lower. In addition, in high load areas such as sudden starts and sudden stops, the inner cylindrical part 12 and the outer cylindrical part 1
1 is pressed and has sufficient cushioning properties. Furthermore, in the case of the shock absorber of the present invention, the outer cylindrical portion 1 of the elastic member 1
1. Since the inner cylindrical portion 12 is cylindrical, even if the outer circumferential surface 12a and the inner circumferential surface 11a collide in any direction and a large load is applied, the outer cylindrical portion 11 of the elastic member 1 at the collided portion The thickness of the inner cylindrical part 12 is always the same. Therefore, the effect of configuring the same load condition for displacement in any direction is achieved. Therefore, a reliable damping effect can be obtained against loads in all directions such as engine rolling and vertical vibration.

Furthermore, when the shock absorber of this embodiment is installed between the vehicle body and the engine, the outer cylinder fitting 2 and the inner cylinder fitting 3 are integrated with the connecting part 13 of the elastic member 1, so that the positioning during installation is accurate. Works well and has good workability. That is, at the time of attachment, the outer cylindrical metal fitting 2 and the inner cylindrical metal fitting 3 of this embodiment are connected at the connecting portion 13 of the elastic member 1. Therefore, the relative positions of the outer cylindrical metal fitting 2 and the inner cylindrical metal fitting 3 are fixed by the elastic member 1 unless a special force is applied. On the other hand, when the engine is stopped, the engine and the vehicle body are connected by the engine mount body, and their relative positions are fixed. In this state, one of the outer cylindrical metal fitting 2 and the inner cylindrical metal fitting 3 of the shock absorber of this embodiment is fixed to the engine and the other to the vehicle body. In this state, the inner cylindrical fitting 3 is coaxially arranged along the central axis of the outer cylindrical fitting 2 due to the elastic member 1. Next, in this state, the connecting portion 1 of the elastic member 1 of the shock absorber
3 to separate the outer cylindrical part 11 joined to the outer cylindrical fitting 2 of the elastic member 1 and the inner cylindrical part 12 joined to the inner cylindrical fitting 3. The relative relationship between the car body and the engine is fixed by the engine mount body, and the outer cylinder metal fitting 2 and the inner cylinder metal fitting 3 are fixed to the engine and the car body, respectively, so the outer cylinder metal fitting 2 and the inner cylinder metal fitting 3 are In a state where they are separated from each other, the inner cylindrical fittings 3 maintain the central axis arrangement of the elastic member 1. Thereby, the outer cylindrical metal fitting 2 and the inner cylindrical metal fitting 3 of the shock absorber can be easily attached to the correct positions shown in FIG.

In this embodiment, four column-shaped pieces are used as the connecting parts 13 of the elastic member 1, but the connecting parts are not limited to column-shaped ones, and the relative positions of the outer cylindrical metal fitting 2 and the inner cylindrical metal fitting 3 are Any material that can be properly fixed and easily cut is sufficient. For example, the connecting portion may be in the form of a thin wall parallel to the axis. Furthermore, cutouts 16, 17, and 18 can be provided in the connecting portions 14 and 15, as shown in FIGS. 7a and 7b. This makes it easier to cut the joint.
Further, the connecting portion may be configured so that it can be cut by the strain when a large strain occurs between the engine and the vehicle body, without having to be cut with a knife or the like.

Further, the thickness of the outer cylindrical portion 11 and the inner cylindrical portion 12 can be changed depending on the purpose of use.

Furthermore, although the outer cylindrical metal fitting 2 is shown as an outer member, any material having an inner circumferential wall with a circular cross section may be used as the outer member, and the inner cylindrical metal fitting 3 can be used as an inner member.
However, any type having an outer circumferential wall with a circular cross section may be used. Further, the circular shape is not limited to a perfect circle, and may be an ellipse or other shape deformed from a perfect circle.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram showing an example of a conventional shock absorber used in an engine, Fig. 2 is a central cross-sectional view of the conventional shock absorber, Fig. 3 is a cross-sectional view showing an embodiment of the present invention, and Fig. 4 5 is a longitudinal sectional view thereof, FIG. 5 is a horizontal sectional view showing the state of use of the shock absorber shown in FIG. 3, and FIG.
The figure is a diagram showing the relationship between displacement and load of the shock absorber shown in Figure 5, and Figure 7 is a diagram showing the relationship between the displacement and load of the shock absorber shown in Figure 5.
FIG. 3 is a partially enlarged cross-sectional view showing different types of connecting portion shapes.
In the figure, 1 is an elastic member, 2 is an outer cylindrical metal fitting, 3 is an inner cylindrical metal fitting, 11 is an outer cylindrical part, 12 is an inner cylindrical part, 1
3 indicates a connecting portion.

Claims (1)

[Claims for Utility Model Registration] (1) An outer member having a hole defined by an inner circumferential wall with a circular cross section, which is supported by one object, and which is supported by another object and has a hole in the outer member. an inner member having an outer peripheral wall with a circular cross section disposed at the center; an outer cylindrical part joined to the inner peripheral wall of the outer member; and an inner cylindrical part joined to the outer peripheral wall of the inner member;
an elastic member consisting of a disconnectable connecting part that integrally connects the outer cylindrical part and the inner cylindrical part; the outer member is attached to the first object without cutting the connecting part; A shock absorbing device characterized in that the inner member is attached to the other object, and after attachment, the connecting portion is cut to separate the outer member and the inner member. (2) The device according to claim 1, wherein the connecting portion is two or more columnar bodies arranged at equal intervals. (3) The device according to claim 1, wherein the connecting portion is a thin wall-shaped body extending parallel to two or more axes provided at equal intervals. (4) The device according to claim 1 of the utility model registration claim, wherein the connecting portion is provided with a notch.