JPS6159035A - Hydraulic damping bearing - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The invention relates to a pot-shaped container, which is closed at its upper periphery in the load direction by a rubber-elastic element and in its lower region by a flexible membrane provided at a distance from the bottom. The present invention relates to a hydraulic elastic bearing, especially for a drive motor, having a casing and a throttling device in the casing interior space between the elastic element and the membrane, which is full of damping fluid.

Prior Art In this type of motor bearing, vibrations during running and vibrations caused by motor unbalance are attenuated at a constant amplitude by throttling the excessive flow of damping fluid in the throttling device, and are rapidly weakened. . In this way, on the one hand, the riding comfort is very good, but on the other hand, the throttling device also contributes significantly to the noise transmission compared to undamped bearings.

Problems to be Solved by the Invention The two problems of the present invention are therefore to combine the desired damping characteristics of elastic bearings with the acoustic damping action of conventional non-λ damping bearings.

Means for Solving/Increasing the Interstitial Layer In order to solve the above-mentioned problem '4', the present invention provides a method in which a negative pressure is applied to the side of the thin section opposite to the damping fluid compared to the outside air. A space closed to the outside is formed in the casing: between xs and the membrane there is a connection which can be communicated alternately to a source of negative pressure and to the outside air;

This invention allows a bearing to be adjusted and stopped using a surprisingly simple means. Under normal conditions, the damping takes place perfectly and as planned, ie because the throttling device exerts its function unhindered by the membrane deforming in response to the external pressure. On the other hand, the negative pressure acting on the underside of the membrane tends to deform the membrane in the direction of the bottom of the casing. The resulting reduced static pressure of the damping fluid causes a similar disintegration of the internal bonding forces with bubble and void formation, which effectively paralyzes the function of the throttling device.

The operation of the bearing in this condition is clearly accompanied by a low noise level for non-contour bearings.

If it is advantageous to apply this invention to an automobile motor bearing, it will not be difficult to generate negative pressure. Lid, this negative pressure is always fully available in the motor's suction collection conduit. The switching of the %:lP membrane ff load between negative pressure and external pressure can be carried out at will by the Ministry of Operation using a solenoid valve which can be actuated, for example, from the instrument panel or at a constant leveling of the bearing system. This can be done automatically or in some cases via the escalation computer.

Example The figure showing one embodiment will be described in more detail.

The important part of the illustrated motor bearing is the rod-shaped casing l.
and an upper bearing/insert body 3 which is supported on this rubber elastic element through a hollow conical rubber elastic element 2, in which case the elastic element 2 is simultaneously formed as a thin plate molded part. It constitutes the upper closure part of the manufactured casing. A thin rubber membrane 4, which bends below the elastic element and away from it and from the bottom of the casing, is inserted in a sealed manner into the folded edge frame. By means of a threaded bolt 5 mounted on the bottom of the casing 1, the bearing can be fixed to a body part (not shown) of the vehicle, while a bearing insert 3 is provided for accommodating a motor holder, also not shown in detail. A screw bolt 6 is provided for this purpose. The separation wall 7 inserted into the edge frame of the casing l together with At1104 has an elastic element 2 and a thin
4, the internal space of the casing, which is closed towards the outside, is divided into an upper chamber 8 and a lower chamber 9, which are completely filled with damping fluid as shown by the dashed lines, and which are completely filled with damping fluid, as shown by the dashed lines. :
are in constant contact with. The shape change of the elastic element 2 caused by the dynamic loading causes a uniform movement of the liquid column between the two chambers 8.9 by the throttle hole 17, which also rolls along the inner wall of the casing 1 with the edge bead. This causes uniform movement of the thin film 1124.

This mode of operation of the bearing described above is known per se.

In the structure according to the invention, the working chamber 1o formed between the thin lI 24 and the closed bottom of the casing 1 has a threaded bolt 5
It has a connection 25 suitable for entering a vibrator or a tube through a hole 15 in which negative pressure or external air pressure is alternately fed into the working chamber 10 in the direction of the arrow vac//at. The thin film 4 deforms in the direction shown by the chain line in response to the shadow of the negative 1 of the working chamber 10, which causes the thin film 4 to attenuate against atmospheric pressure as described above. Foaming spots and vapor bubbles form in the damping liquid in the chamber 8.9, which effectively stops the operation of the entire damping device.

[Brief explanation of the drawing]

The figure shows a cross section of the motor bearing. Symbol in the diagram 4. Thin film

Claims (1)

[Claims] 1) A bowl-shaped casing whose upper peripheral edge in the load direction is closed by a rubber-elastic element and whose lower region is closed by a flexible membrane located away from the bottom and which is filled with damping fluid. In a hydraulically damped elastic bearing, in particular for a drive motor in a vehicle, which has a throttle device in the casing interior space between the elastic element and the membrane, on the side of the membrane (4) opposite to the damping fluid, A damping bearing configured to apply negative pressure compared to outside air. 2) A space (10) closed toward the outside has connections (15, 25) between the casing bottom (1) and the membrane (4) that can be communicated alternately to a source of negative pressure and to the outside air. , a bearing according to claim 1).