Hydraulically damping mount

Abstract

A hydraulically damping mount for mounting a motor vehicle unit, such as mounting a motor vehicle engine on a motor vehicle body, includes a supporting spring and a compensation chamber. The supporting spring is configured to support a mount core and surround a working chamber. The compensation chamber is separated from the working chamber by a dividing wall and delimited by a compensation diaphragm. In embodiments, the compensation chamber and the working chamber are filled with a fluid and are connected to each other by a damping duct incorporated into the dividing wall. In embodiments, the dividing wall includes a diaphragm that is capable of oscillating, and a foam element associated with the diaphragm supports the diaphragm in the event of a deflection.

Claims

1. A hydraulically damping mount for mounting a motor vehicle unit comprises: a supporting spring, the supporting spring supporting a mount core and surrounding a working chamber; and a compensation chamber separated from the working chamber by a dividing wall and comprising a compensation diaphragm, wherein the compensation chamber and the working chamber are filled with a fluid and are connected to each other by a damping duct incorporated into the dividing wall; the dividing wall has a decoupling diaphragm configured to oscillate; and a foam element is associated with the decoupling diaphragm, supports the decoupling diaphragm, and is compressed by the decoupling diaphragm oscillating.

2. The hydraulically damping mount according to claim 1, wherein the foam element is accommodated in a foam element chamber.

3. The hydraulically damping mount according to claim 2, wherein the foam element chamber is sealed at one end face by the decoupling diaphragm.

4. The hydraulically damping mount according to claim 1, wherein the foam element-comprises a closed-cell foam.

5. The hydraulically damping mount according to claim 1, wherein the foam element-comprises a polyurethane foam.

6. The hydraulically damping mount according to claim 1, wherein the foam element-comprises a micro-cellular foam (MCU).

7. The hydraulically damping mount according to claim 1, wherein the foam element is formed with a shape of a hollow cylinder.

8. The hydraulically damping mount according to claim 1, wherein one or more damping properties of the mount can be adjusted by modifying or adjusting a hardness of the foam element.

9. The hydraulically damping mount according to claim 8, wherein a Shore hardness of the foam element is modified or adjusted.

10. The hydraulically damping mount according to claim 1, wherein the motor vehicle unit comprises a motor vehicle engine for mounting on a motor vehicle body.

11. The hydraulically damping mount according to claim 1, wherein an opening associated with a switch valve is provided on the foam element chamber.

12. A hydraulically damping mount for mounting a motor vehicle unit comprises: a supporting spring, the supporting spring supporting a mount core and surrounding a working chamber; and a compensation chamber separated from the working chamber by a dividing wall and comprising a compensation diaphragm, wherein the compensation chamber and the working chamber are filled with a fluid and are connected to each other by a damping duct incorporated into the dividing wall; the dividing wall has a decoupling diaphragm configured to oscillate; a foam element is associated with the decoupling diaphragm and supports the decoupling diaphragm in the event of a deflection; and an opening associated with a switch valve is provided on the foam element chamber.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The invention is explained in more detail below with reference to exemplary embodiments that are schematically shown in the Figures. In the Figures:

(2) FIG. 1 shows a cross-sectional view of an exemplary embodiment of the hydraulically damping mount; and

(3) FIG. 2 shows a cross-sectional view of another exemplary embodiment of the hydraulically damping mount.

DETAILED DESCRIPTION

(4) FIG. 1 shows a hydraulically damping mount 10 with a supporting spring 12 supporting a mount core 14 and surrounding a working chamber 16. Furthermore, a compensation chamber 18 is provided, which is separated from the working chamber 16 by a dividing wall 20 and is delimited by a compensation diaphragm 22. The working chamber 16 and the compensation chamber 18 are filled with a fluid 24 and connected to each other via a damping duct 26 incorporated into the dividing wall 20.

(5) The dividing wall 20 has a diaphragm 28 accommodated in a manner capable of oscillating. The diaphragm 28 is associated with a chamber 30 in which a cylindrical foam element 32 is accommodated. The chamber 30 is molded into a cup 34 accommodating the compensation chamber. The diaphragm 28 covers the chamber 30 at an end face of the chamber 34.

(6) The foam element 32 fills the chamber 30 completely. In this case, the foam element 32 rests against all sides of the chamber 30 as well as against the diaphragm 28. However, the foam element 32 is not attached to the diaphragm. The foam element 32 rests against the diaphragm 28 in the area which is capable of oscillating during the operation of the hydraulically damping mount.

(7) Oscillations acting on the hydraulically damping mount 10 are absorbed by the supporting spring 12 and cause the working chamber 16 to become larger or smaller. Thus, a hydraulic pressure 16 is built up in the working chamber. For the set frequency range, the pressure built up in the working chamber 16 is transmitted onto the diaphragm 28. However, the foam element 32 rests against the diaphragm 28 in the chamber 30 and supports the former. Together, the foam element 32 and the diaphragm 28 have a stiffness that is high enough for forcing the fluid 24 through the damping duct 26 and produce a damping action. In this case, however, the stiffness is comparatively low in order thus to set the dynamic overall stiffness to a value similar to the state without a damping action.

(8) FIG. 2 shows another embodiment of the hydraulically damping mount according to the invention.

(9) The hydraulically damping mount 100 has a chamber 44 which, in the radial direction and centrally on the side facing away from the diaphragm 28, has an opening 48 associated with a switch valve 42. In the open position of the switch valve 42, air 36 can be introduced from the outside into the chamber 44.

(10) Furthermore, the hydraulically damping mount 100 has a hollow-cylinder-shaped foam element 46 with a passage 50. The passage 50 is disposed centrally in the radial direction and extends axially to the foam element 46, along the axis A.

(11) Also in this embodiment, oscillations acting on the hydraulically damping mount 100 are absorbed by the supporting spring 12 and cause the working chamber 16 to become larger or smaller. Thus, hydraulic pressure is built up in the working chamber 16. For the set frequency range, the pressure built up in the working chamber 16 is transmitted onto the diaphragm 28. However, the foam element 46 rests against the bottom of the diaphragm 28 in the chamber 44 and supports the former. Together, the foam element 46 and the diaphragm 28 have a stiffness that is high enough for forcing the fluid 24 through the damping duct 26 and produce a damping action.

(12) The diaphragm 28 is supported by the foam element 46 in such a way that the foam element 46 is compressed by the diaphragm 28 oscillating. The foam element 46 is compressed in such a way, when the diaphragm 28 oscillates, that an empty space is created in the chamber 30. During the course of the oscillation, this space becomes larger in a radially outward direction as well as axially, in the direction of the oscillation of the diaphragm 28.

(13) The space created by the oscillating diaphragm 28 in the chamber 44 can be filled with air 36 by means of the passage 50 of the foam element 46, which is disposed centrally in the radial direction and extends axially. For a short time, this decouples the diaphragm 28 from the foam element 46 and thus reduces the stiffness of the system diaphragm/foam element. Thus, the dynamic overall stiffness of the hydraulically damping mount 100 can be reduced.