JPS5854247A - Vibro-isolating rubber device - Google Patents

Abstract

PURPOSE:To prevent a damping effect of vibration from changing due to temperature, by utilizing viscosity damping force through liquid to an engine mounting device and constituting the engine mounting device in such a manner that area of throttle passages is controlled in accordance with a change of temperature. CONSTITUTION:Chamber spaces 9 and 14 are communicated to each other through throttle passages 16 and 17, formed in a frame body 1, and liquid is sealed internally of these chambers. A valve element 18 opens the throttle passage 16, with a bimetal element 22 at prescribed temperature or less, while closes the throttle passage 17, with the bimetal element at prescribed temperature or more. Accordingly, change of a vibration damping effect due to temperature change can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vibration isolating rubber device, and more particularly to a vibration isolating rubber device for mounting an engine in a vehicle such as an automobile.

Anti-vibration rubber mountings for engine mounts used in vehicles such as automobiles generally include a rubber-like elastic body made of rubber or a rubber-like material, and are designed to attenuate vibrations through internal friction of the rubber-like elastic body. It has become. The stiffness and damping coefficient of rubber or rubber-like products change depending on the environmental temperature. Therefore, if the stiffness and damping coefficient of rubber or rubber-like products are set to appropriate values under winter conditions, the environmental temperature will change from winter. During the hot summer months, the stiffness and damping coefficient of rubber or rubber-like products decrease and fall below appropriate values.

When the rigidity and damping coefficient of rubber or rubber-like products fall below appropriate values, engine shake worsens. Also, if the rigidity and damping coefficient of rubber or rubber-like products are set to appropriate values under summer conditions, lW will be lower than in summer.
In winter when l is low, the stiffness and damping coefficient of rubber or rubber-like products exceed appropriate values, leading to an increase in muffled noise. Furthermore, the rubber-like elastic body of the vibration-isolating rubber device for engine mounting is affected by heat from the engine, which also changes its rigidity and damping coefficient, and does not provide a stable vibration-insulating effect.

In addition, as one of the conventionally known anti-vibration rubber for engine mounting, the chamber space is defined by the rubber-like elastic body, and it has a restricting passage for allowing fluid to enter and exit the cough chamber. There is something. In this anti-vibration rubber device, vibration is absorbed by the internal friction of the rubber-like elastic body as well as by the viscous capital reduction effect caused by fluid in the room space flowing in and out through the throttle passage. Even in this type of anti-vibration rubber device, the rigidity and damping coefficient of the rubber-like elastic body deteriorate depending on the environmental temperature, so its vibration reduction performance deteriorates, and the viscosity coefficient of the fluid flowing in and out of the chamber deteriorates. Due to the change in IlChen, its viscous capital reduction performance will also change, and its vibration damping effect will be strongly affected by changes in environmental temperature.

An object of the present invention is to provide an improved vibration-proof rubber @ stomach so that the vibration damping effect does not change significantly even when the environmental temperature changes.

This purpose, according to the present invention, includes two frames and a rubber-like elastic body extending between the two frames, connecting them, and working together with the frames to define a room space. An annular wall element, a restriction passage for allowing fluid to enter and exit the chamber space, and a feeling 1!
! I have the same feeling! When the temperature sensed by the element is below a predetermined value, the effective passage cross-sectional area of the throttle passage is set to a first value, and when the temperature is above the predetermined value, the effective passage cross-sectional area of the throttle passage is set to the first value. This is achieved by a vibration isolating rubber device characterized by having a two-stage south aperture control means for setting the second value to a smaller value.

The invention will be explained in more detail below by way of example embodiments with reference to the attached figures.

The attached figure is a vertical IIWJ diagram showing one embodiment of the vibration isolating rubber device according to the present invention. In the figure, 1 and 2 each have a frame body, and these frame bodies are constructed to have wall portions 3 and 4 facing each other. Frames 1 and 2 are that I! An annular rubber-like elastic body provided between the surfaces 3 and 4! ! They are interconnected by elements 5. Annular wall element 5
is made of rubber or rubber-like material, one end of which is vulcanized and bonded to the wall 3, and the other end fixedly connected to the wall 4 by means of an insert fitting 7 and a port 8. The annular wall element 5 defines a room space 9 on its inside in cooperation with the frames 1 and 2. Further, a stopper ring 10 is attached to the outer periphery of the annular wall element 5 to prevent the annular wall element 5 from expanding in the radial direction beyond a predetermined value.

A cap-shaped cover member 12 is attached to the opposite side of the wall portion 3 of the frame body 1 with bolts 11. A diaphragm 13 is stretched over the hollow part inside the cover member 12, and the diaphragm 13 cooperates with the frame 1 on one side to define the τ chamber space 14, and on the other side, the cover member The air chambers 15 are respectively defined in cooperation with the portions 112.

The chamber spaces 9 and 14 communicate with each other through passages 16 and 17 formed in the frame 1, and a suitable liquid such as antifreeze is sealed inside these passages. Throttle passages 16 and 17 are provided in parallel with each other, and throttle passage 16 is always open, but throttle passage 17 is selectively opened and closed by a valve element 18. Valve element 18 is connected to passage 1
7 is inserted into a hole 19 provided in the frame 1 so as to be perpendicular to the frame 1 so as to be movable in the direction of its axle, and one end protrudes into a case 20 attached to one side of the frame 1. 20
It engages a bimetallic element 22 of the snap-action type which is mounted with a leaf spring 21 therein. When the temperature is below a predetermined temperature, the bimetal element 22 assumes a shape as shown by the solid line in the figure, and the valve element 18 is connected to the compression coil spring 2.
It is allowed to move to the right in the figure by the spring force of 3.
On the other hand, when the temperature is above a predetermined temperature, the valve element 18 takes on a shape as shown by the broken line in the figure, and the valve element 18 is compressed by the compression coil spring 23.
It is designed to be driven to the left in the figure against the spring force. As a result, when the bimetal element 22 is at a predetermined temperature or lower, the valve element 18 is located at a position that does not cross the throttle passage 17 and opens the throttle passage 17, whereas when the bimetal element 22 is at a predetermined temperature 11 or higher, the valve element 18 opens the throttle passage 17. It is located at a traversing position and intersects the throttle passage 17. Further, the valve element 18 is provided with a communication hole 24 for guiding the liquid sealed in the chambers -9 and 14 into the case 20 in which the bimetal element 22 is housed.

The same liquid as the liquid sealed in the chamber spaces 9 and 14 is sealed in the case 20.

In addition, the cover member 12 and the frame body 2 are each attached with bolts 2.
5.26 is fixed.

According to the vibration isolating rubber device constructed as described above, when the degree m of the sealed liquid is below a predetermined value, that is, at room temperature, the throttle passage 17 is opened, so that the chamber spaces 9 and 1 are
The effective area of the throttle passage 11i that communicates with the throttle passage 111 is the sum of the passage cross-sectional areas of the throttle passages 1116 and 17, which is, needless to say, larger than when the throttle passage 17 is closed. On the other hand, when l1rIL of the sealed liquid is above a predetermined value, that is, when the temperature is high, the throttle passage 17 is closed by the valve element 18, and at this time, the effective passage cross-sectional area of the throttle passage communicating the chamber spaces 9 and 14 is is only the passage 1lirB@ of the throttle passage 16, which is, needless to say, smaller compared to the case where the throttle passage 17 is open.

Therefore, at high temperature, 119 and 14 in the τ room compared to room temperature.
The viscous damping force due to the enclosed liquid is increased, which compensates for the reduction in the stiffness and damping coefficient of the annular wall element at high temperatures and the change in the vibration damping effect due to the reduced viscosity of the enclosed liquid. .

Therefore, with this anti-vibration rubber device, the vibration damping effect does not change significantly whether at room temperature or high temperature, and exhibits a stable vibration damping effect.

Although the present invention has been described in detail with respect to specific embodiments above, it will be appreciated by those skilled in the art that the present invention is not limited thereto and that various embodiments can be made within the scope of the present invention. It would be obvious for

[Brief explanation of the drawing]

The attached figure is a 111-plane view showing one embodiment of the vibration-proof rubber device according to the present invention. 1.2... Frame body, 3.4-... Wall part, 5... Annular wall element. 7...Insert metal fittings, 8...Bolts, 9...Room space. 10...stopper ring, 11-...bolt, 12
...Cover member, 13...Diaphragm, 14...
・Room space. 15... Air chamber, 16.17... Throttle passage, 18.
... Valve element, 19... Hole, 20... Case, 21.
...Plate spring. 22... Bimetal element, 23-... Compression coil spring.

Claims (1)

[Claims] Two frame bodies, and a ring-shaped rubber-like elastic body extending between the two frame bodies, connecting them, and working together with the frame bodies to define a room space! an element, - a throttle passage for allowing flow in and out of the chamber space, and a sensing element; and a two-stage throttle 111vs means for setting the effective passage area of the throttle passage to a second value smaller than the first value when the temperature is above a predetermined value. Anti-vibration rubber device.