JPS59131048A - Fluid mounting structure for power unit - Google Patents

Abstract

PURPOSE:To heighten the anti-buckling strength of an elastic member, by previously applying a tension to a flange-like vibration-proof rubber for constituting the elastic member, at the time of assembly, to move up a cylindrical vibration-proof rubber integrated with the flange-like vibration-proof rubber. CONSTITUTION:An elastic member 11, which has an internal opening, is interposed between an upper cover secured on a power unit and a lower cover 2 secured on a vehicle body. The elastic member 11 comprises a cylindrical vibration-proof rubber 11a for absorbing a vertical vibration, and a flange-like vibration-proof rubber 11b which extends from the middle part of the wall of the cylindrical rubber and acts to absorb a horizontal vibration. When the elastic member 11 is assembled with the vehicle body, the flange-like vibration-proof rubber 11b is set to exert an elastic force to move up the cylindrical vibration- proof rubber 11a. According to this constitution, when the load upon the elastic member 11 has fluctuated, the elastic force of the rubber 11b stops the fluctuation to prevent the elastic member 11 from buckling at the bent part.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an improved mount structure for arranging a power unit such as an engine in a vehicle and an electric body to vibrate the power unit.

Previously, there was a personal vehicle VR equipped with an internal combustion engine.

When mounting the power unit, use the insulator rubber between the power unit and the distorted body to obtain excellent @Y control from the power unit, or to receive the impressive vibration isolation mechanism input from the road surface. There is usually one. With this type of conventional mounting means, the insulator rubber is bent by a large hole due to load fluctuations, and since the power unit is at 91 f6, this displacement occurs within the engine loop. A clearance must be provided for absorption. In order to deal with this problem, attempts have been made to suppress the displacement by increasing the rubber rigidity of the insulator rubber, but the damping force decreases and the vibration damping properties of the power unit and static body deteriorate. There is a musical accompaniment. Rubber rigidity I/r of the insulator rubber
However, due to the conflict between the deflection violet and the anti-vibration characteristics, there is a certain point that if the requirements are not satisfied, it will be difficult to maintain the stability.

As a means of satisfying the above requirements, a fluid-filled mount structure has been considered, and an example thereof is shown in FIG. ldD
In the figure, 1 is a P cover fixed to the power unit side, 2 is a lower cover fixed to the vehicle body side, and an elastic member 3 such as rubber is fitted between the two. The elastic member 3 includes a cylindrical anti-vibration rubber 3a that absorbs vibrations in the vertical direction, and is extended from the middle part of the wall of the cylindrical melt-proof rubber 3a to absorb vibrations in the inertial direction. It consists of a flange-like melt-proof rubber 3b that absorbs water, and its respective ends are connected directly or directly to the upper cover 1) and the lower cover 2.
v+ are tangentially coupled together. (fThe above elastic member 3
A diaphragm 5NL and a partition device 6 supported and fixed by a fixed metal are installed in the hollow part formed by 1. to form a night chamber A and a liquid chamber B. An orifice is provided at the center of the path of the partitioning machine 6, and one liquid in the orifice 7 becomes liquid depending on the load fluctuation.

In the case of the conventional fluid mount structure 1 as described above, the load motion applied to the elastic member 5 is absorbed by the low pile through which the fluid flows through the orifice 7, resulting in smooth deflection and nM vibration characteristics. However, when the load fluctuation becomes a relatively large hole, there is a bend in the elastic member 3, buckling of the part surrounded by @ff circle C, etc., and there are @ points where elephants are likely to occur. this!
As explained by the graph of FIG. 2, the elastic member 3'
The load G becomes a 111th large hole. Therefore, the amount of deflection X of the elastic member 3 increases, and this amount of deflection X reaches a constant eye point D.
A buckling phenomenon will occur in the area surrounded by circle C above when Y is exceeded. Beyond this limit point D, the pttrfr weight G increases y
The amount of deflection of the elastic member 3 also increases further w t
ru. The occurrence of this severe buckling phenomenon is not desirable in terms of the support structure of the power unit, and when the vibration-proofing structure is deteriorated, the elastic members such as rubber outside the buckling part deteriorate! promote,
There were drawbacks when it came to durability.

The present invention is based on the above conventional power unit fluid mount structure vrr! In other words, even if a large load is applied to the elastic member, it will not buckle easily. The present invention provides a structure l in which a tension is applied to the flange-shaped anti-vibration rubber f so as to cause it to move toward the cylindrical melt-proof rubber gage formed integrally therewith.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference is made below to the drawings ya - illustrative embodiments of the invention! (l-explanation):,,,The elastic member 11 is also surrounded by R in FIG. 3, and the vertical bridge @ Y absorption filters the cylindrical anti-vibration rubber lla, and the cylindrical melt-proof rubber 111! Extended from the middle part, the frame S in the +11 direction
The elastic member 11 is made of a flanged melt-proof rubber llh that absorbs
A large part of the flanged melt-proof rubber llb occupies a tilted position above the full height position of the elastic member 11, and each end of the elastic member 11 is connected to the fixing metal 4.
a and the lower cover 2 directly or indirectly by sulfur bonding. Next, considering fr I Y 710 in the vertical direction with respect to the elastic member 11Vr, the elastic member 11 changes from the shape of the solid line in the figure to the shape of the dotted line Kf,
In the end, the assembly shown in FIG. 4 results in a well-formed shape. Is the load in the earthwork direction the pressing force of the ten cover and bottom cover 2MK outside the diagram? It can be done by adding the lower cover 2 fixed to the upper body side.
On the other hand, by fixing a power unit such as an engine to the upper cover side (outside of the figure), the brim-shaped melt-proof rubber 11i+%j can be deformed into a substantially horizontal state (α-port in Figure 4) by the weight of the power unit. reactor.

Since the power unit is assembled while maintaining the deformed state of the flanged anti-fusible rubber llb as described above, in the state shown in FIG. It has a strong elastic force that moves the cylindrical melt-proof rubber 11aYk.

That is, a greater force is applied as shown by arrow E. If this elastic force is applied, the tension exerted by the collar-shaped vibration isolating rubber 11 tlvr will act against the load f of the fixed cover 11111 K + power unit not shown in the figure. . Note that the configuration in which a liquid chamber is provided at a distance from the middle nitrogen chamber 1-■ of the elastic member 11 by a partition plate having an orifice is the first one.
Since it is the same as the conventional example shown in the figure, detailed explanation and illustration will be omitted.

In the configuration described above, when a load fluctuation occurs on one elastic member 11, the brim-shaped vibration isolating rubber 11h is biased.
The elastic force changes the load! ! Stop accepting I minutes.

The elastic member 110 has the effect of preventing buckling at the bent portion. This is explained using the graph in FIG. 5. As the load G on the elastic member 11 increases by the 111th order, it is natural that the amount of deflection X of the elastic member 11 increases. When the limit point D is exceeded, the buckling phenomenon shown in FIG. 2 does not occur. At this conventional limit point Dl, the load G becomes general and the elastic member 110 reaches the second limit point D'.
An annual flexion phenomenon will occur. Therefore, the amount of deflection that causes buckling extends from D to D', and the elastic member 11
The solution is to increase the permissible limit of the load that can be applied from f to f'K. Normally, if the load G is set to be smaller than Yr, which is determined by the power unit's own weight, etc., there is no risk that the above-mentioned buckling phenomenon will occur.

As explained above in detail, the fluid mount structure of the power unit according to the present invention is assembled in advance by applying an elastic force to the collar-shaped vibration isolating rubber to resist and meet the load. Therefore, the limit load sound at which the elastic member buckles can be reduced, and the deterioration of the elastic member can be prevented, resulting in a long service life. It is effective for those who overuse the fluid mount structure of the fluid mount structure.

[Brief explanation of the drawing]

Figure 1 is an example of the mount structure of a conventional fluid-filled power unit! Figure 2 shows the structure example shown in Figure 1.
FIGS. 3 and 4 are partial cross-sectional views showing the assembled state of the fluid mount tank weight of the power 0 unit according to the present invention, and FIG. Deformation width of elastic member? This is a graph showing. l...upper cover, 2...lower cover, 4...fixing metal fittings. 5...Diaphragm, 6...Partition, 7...Orifice. 11... Elastic member, 11a... Cylindrical melt-proof rubber, ll
h... Flange-shaped melt-proof rubber.

Claims (1)

[Claims] ... A hicaber fixed to the power unit 1llll. An elastic member with a hollow chamber in the lower cover that is fixed to the vehicle body 1μIII/r? valve! f-, and a fluid mount 49 is constructed with a liquid chamber connected to the hollow internal f orifice by a partition plate, and the front elastic member is vertically compressed. l11 of the cylindrical anti-melt rubber and the cylindrical melt-proof rubber
1 consists of a flange-shaped vibration-proofing rubber that extends from the middle of the wall and absorbs lateral vibration, and the flange-shaped vibration-proof rubber Vr is a surface that is integrally connected with this flange-shaped vibration-proof rubber. What is the force of the bullet that moves the anti-camera rubber upward? The fluid mount structure of the power unit is made of Y46F4, which is assembled with force.