JPS5965635A - Vibrationproof rubber device - Google Patents

Abstract

PURPOSE:To prevent vibration damping effect from being changed due to the change of environmental temperature by providing a contraction passage between fluid chambers partitioned by rubber like elastic bodies and controlling said contraction passage with a form storing alloy, in an engine mounting device for a car, etc. CONSTITUTION:Chamber spaces 9, 14 are communicated to each ther by holes 16, 18 and a valve chamber 19 formed in a frame body 1, and a valve element 20 is provided in the valve chamber 19. The valve element 20 is positioned by means of a compression coil spring 22 made of a form storing alloy and a compression coil spring 23 made of general spring steel, driven by the elongation of the compression coil spring 23 when the environmental temperature exceeds a prescribed value, and moved to a position where the hole 18 is closed. Accordingly, attenuating force due to viscosity produced when a fluid flows through both chamber spaces 9, 14 becomes large, and thus the change of the vibration damping effect is compensated since the attenuation coefficient of an annular wall element 5 is lowered at high temperature along with the reduction of the viscosity of the fluid.

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 on a vehicle such as an automobile.

Anti-vibration rubber devices for engine mounting used in vehicles such as automobiles generally include a rubber-like elastic body made of rubber or a rubber-like material, and subtraction of vibration 4) is performed by internal friction of the rubber-like elastic body. It's getting wet. rubber or gol
,, Similar products (,1) The stiffness and damping coefficient 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. In the summer when the temperature is high, the stiffness and damping coefficient of rubber or rubber-like products decrease and fall below appropriate values.

As described above, when the rigidity and damping coefficient of rubber or rubber-like products fall below the appropriate value of 11f1, engine shake worsens. Furthermore, if the stiffness and damping coefficient of rubber or rubber-like products are set to appropriate values under summer conditions, the stiffness and damping coefficient of rubber or rubber-like products will be set to appropriate values in winter when the temperature is lower than in summer. In addition, the rubber-like elastic body of the anti-vibration rubber device for engine mounting is affected by heat from the engine (j, which also changes its rigidity and damping coefficient, Does not provide stable vibration isolation effect.

Furthermore, as one of the conventionally known vibration isolating rubber devices for engine mounting, a chamber space is defined by the rubber-like elastic body, and it has a throttle passage through which fluid enters and exits the chamber space.C) There is. In this anti-vibration rubber device, vibration is absorbed by the internal original vibration of the rubber-like elastic body as well as the viscous damping effect caused by the fluid flowing in and out of the room space through the throttle passage. Even in a vibrating rubber device, the vibration damping performance of the rubber-like elastic body changes depending on the environmental temperature, and the damping coefficient changes, and the viscosity coefficient of the fluid flowing in and out of the chamber space changes depending on the temperature. Therefore, its viscous damping performance also changes, and its vibration damping effect is strongly influenced by changes in the environmental temperature i.

An object of the present invention is to provide an improved vibration isolating rubber device in which the vibration damping effect does not change significantly even if the ambient 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 throttle passage that allows fluid to enter and exit the chamber space, a valve element that controls an effective passage cross-sectional area of the throttle passage, and a shape memory alloy made of a shape memory alloy that is sensitive to the ambient temperature m and drives the valve element. This is achieved by a vibration isolating rubber device (r) characterized in that it has a driving member.

See attached figure below1. /This defense will be explained in detail with reference to embodiments.

FIG. 1 is a longitudinal cross-sectional view showing one embodiment of a vibration-proof rubber device according to the present invention. In the figure, 1 and 2 each indicate a frame body, and these frame bodies are composed of walls 3 and 4 facing each other.
It is configured to have. The frames 1 and 2 are connected to each other by an annular wall element 5 of rubber-like elastic material provided between the wall portions 3 and 4 at -. The annular wall element 5 is made of rubber or rubber-like material, and one end thereof is connected to the wall portion 3.
The other end is vulcanized and bonded to the wall portion 4 by inserts 1 to metal fittings 7 and bolts 8. Annular wall element 5
The frame body 1 and the frame body 2 work together to define a room space 9 on the inside thereof. Further, a stop 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 hli.

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 17 is stretched over the space inside the cover member 12, and the diaphragm 13 cooperates with the frame 1 to define the room space 14 on one side and the cover on the other side. One member 12
They cooperate with each other to define the air chambers 15. The cover member 12 and the frame body 2 are each provided with takeaway bolts 29 and 30.

The chamber spaces 9 and 14 are formed by holes 16, 17, .
They communicate with each other through a valve chamber 18 and a valve chamber 19, and a suitable liquid such as antifreeze is sealed inside these. The valve chamber 19 is provided with a valve element 20;
has a cap 21 and a valve element 20 attached to one end thereof.
A compression coil spring 22 made of a shape memory alloy such as AI-Ql-JJi alloy is placed between the valve chamber 19 and the valve element 20, and a compression coil spring 23 made of general spring steel is placed between the other end of the valve chamber 19 and the valve element 20. It is provided. The compression coil spring 22 is in a contracted state and has a short free length when the temperature of the enclosed liquid is below a predetermined value due to a shape memory effect, that is, a temperature-sensitive reversible deformation effect, and when the temperature of the enclosed liquid is below a predetermined value, it is in a contracted state and has a short free length. The valve element 20 is expanded to increase its free length, and the change in the free length drives the valve element 20. That is, the valve element 20 is in the position shown in FIG. 1 when the helical compression spring 22 is in the retracted state, opening both holes 17 and 18;
On the other hand, when the compression coil spring 22 is in an extended state, the compression coil spring 22 is displaced to the left in the figure against the spring force of the compression coil spring 23, and the second
The hole 18 is closed as shown in the figure.

Note that the valve element 20 is provided with a communication hole 28, so that the chamber space in which the compression coil spring 22 is disposed is also filled with the sealed liquid.

According to the vibration isolating rubber device having the configuration as described above, when the temperature of the sealed liquid is below a predetermined value, that is, at low temperature or room temperature, the compressed spring 22 made of a shape memory alloy As shown in FIG. 1, in the retracted state, the valve element 20 is in the position of opening the holes 17 and 18, so that the effective passage cross-sectional area of the throttle passage communicating the chamber spaces 9 and 14 is now reduced to 1. The sum of the passage cross-sectional areas of the i-holes 17 and 1B is KL 1. On the other hand, when the temperature of the sealed liquid is higher than a predetermined value, the valve element 20 is turned on.
The hole 18 is closed, and at this time, the effective passage cross-sectional area of the throttle passage communicating the chamber spaces 9 and 14 is the passage cross-sectional area of the hole 17 ( ), which is smaller than that at low temperature or normal temperature. Therefore, when the temperature is high, the viscous damping force generated by the liquid sealed in the chamber spaces 9 and 14 flowing through the two chamber spaces through the throttle passage becomes larger than when the temperature is low or at room temperature. Changes in the vibration damping effect due to the lowering of the stiffness and damping coefficient of the annular wall element and the lowering of the viscosity of the enclosed liquid at high temperatures are sometimes compensated for.

3 to 5 show another embodiment of the vibration isolating rubber device according to the present invention. In FIGS. 3 to 5, parts corresponding to those in FIGS. 1 and 2 are designated by the same reference numerals as those used in FIGS. 1 and 2. In such an embodiment, the valve element 20 is inserted into the valve chamber 19 so as to be movable in the axial direction thereof, and intersects the holes 1G and 17 near one end, and the intersecting portion is provided with the holes 1G and 17 shown in FIGS. As shown in FIG. 5, an inclined notch 20a is provided.The degree of communication between the slots 1G and 17 decreases as the valve element 20 moves to the left in FIG. 1, and the valve element 20 has several omnidirectional shape memory alloy elements protruding from one side of the frame 1 at the other end into the case 24, which is fixed at one end by a bolt 25 in the case 271. The omnidirectional shape memory alloy is 1e-Ni based and has a temperature-sensitive continuous reversible deformation effect.
tilts to the left in Figure 3 as the temperature rises, and valve element 2
0 is driven to the left against the spring force of the FF cotton 21 pin 27. Also, the valve element 20 has a chamber space 9
A communication hole 28 is provided for guiding the liquid sealed in the chambers 9 and 14 into the case 24, so that the same liquid as the liquid sealed in the chamber spaces 9 and 14 is filled in the case 24. Ru.

According to the vibration isolating rubber device configured as described above, when the temperature of the sealed liquid rises, the leaf spring 26
It tilts to the left in the figure, and the valve element 20 is driven to the left.

As a result, the communication between the holes 16 and 17, that is, the effective cross-sectional area of the passage, gradually decreases as the temperature rises, and the liquid sealed in the chamber spaces 9 and 14 flows through the chamber spaces 16 and 17. At high temperatures, the viscous damping force generated by this increases.

This compensates for the change in the damping effect due to the lower stiffness and damping coefficient of the annular wall element and the lower viscosity of the enclosed liquid.

Therefore, in this vibration-proof rubber device, the vibration damping effect does not change significantly whether at room temperature or high temperature, and exhibits a stable vibration damping effect. Further, according to the vibration-isolating rubber device according to the present invention, the valve element that controls the effective passage cross-sectional area of the throttle passage is driven by a shape-memory alloy driving member, and the shape-memory alloy has a larger temperature-sensitive deformation than bimetals or the like. Since is large, the movement m of the valve element can be increased,
' -9- This eliminates the need to be very precise in setting the position of the holes, and allows reliable and highly accurate control.

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

[Brief explanation of drawings]

Fig. 1 is a longitudinal cross-sectional view showing one embodiment of the vibration-isolating rubber device according to the present invention, and Fig. 2 shows the valve element of the anti-vibration rubber device shown in Fig. 1 in a closed state. Figure 3 shows another embodiment of the vibration isolating rubber device according to the present invention. l cross section,
4 is a sectional view taken along line IV--IV in FIG. 1, and FIG. 5 is a plan view showing the valve element. 1.2... Frame body, 3, 4... Wall portion, 5... Annular wall element. 7...Insert metal fittings, 8...Bolts, 9...Room space. 10...Stopper ring, 11...Bolt, 12.
...Cover part, 13...Diaphragm, 14...
Room space. 15... Air chamber, 16.17.18... Hole, 19.
... Valve chamber, 20... Valve element, 21... Cap, 2
2.2310-...compression] spring, 24...case, 25...
bolt. 26... leaf spring, 27... compression] il spring, 28...
...Communication hole, 29.30...several bolts Patent applicant Toyota Motor Corporation representative
Attorney Patent Attorney Akashi 8 Tsuyoshi 11- Figure 1 Figure 2

Claims (1)

[Claims] two frames, an annular wall element made of a rubber-like elastic body that extends between the two frames, connects them, and cooperates with the frames to define a chamber space; and a fluid for the chamber space. a throttle passage for entering and exiting the throttle passage, a valve element for controlling the effective passage cross-sectional area of the throttle passage, and a drive section made of a shape memory alloy for driving the valve element in response to ambient temperature. Features a 16 anti-vibration rubber device.