Separation device for separating a working chamber and a compensation chamber of a hydraulically damping mount, and a hydraulically damping mount

Abstract

A separation device for separating a working chamber and a compensation chamber of a hydraulically damping mount includes a first nozzle disc and a second nozzle disc made of a first material and forming a damping channel interconnecting the working chamber and the compensation chamber. The first nozzle disc may include a sealing member made of a second material and abut the second nozzle disc to seal the damping channel. A hydraulically damping mount for mounting a motor vehicle unit may having a separating device.

Claims

1. A separation device for separating a working chamber and a compensation chamber of a hydraulically damping mount, the separation device comprising: a first nozzle disc; and a second nozzle disc; wherein the first nozzle disc and the second nozzle disc are made of a first material and form a damping channel that interconnects the working chamber and the compensation chamber, wherein the first nozzle disc comprises a sealing member made of a second material and abuts the second nozzle disc to seal the damping channel, wherein the second nozzle disc has a receiving opening into which the first nozzle disc is inserted; and wherein the receiving opening has a circumferential shoulder against which the sealing member abuts.

2. The separation device according to claim 1, wherein the first nozzle disc and the sealing member are manufactured using a two-component injection moulding process.

3. The separation device according to claim 1, wherein the first material is a fibre-reinforced plastic; and the second material is a thermoplastic elastomer.

4. The separation device according to claim 1, wherein the sealing member surrounds the first nozzle disc on an outer circumferential side.

5. The separation device according to claim 1, wherein the receiving opening has a circumferential shoulder against which the sealing member abuts.

6. The separation device according to claim 5, including a channel formed by a first channel section and a second channel section which are separated from one another by the first nozzle disc and sealed from one another by means of the sealing member.

7. The separation device according to claim 6, wherein the first nozzle disc has the channel on an outer circumferential side which abuts against the inner circumferential wall of the receiving opening in order to form the first channel section; the channel has a first leg, a second leg, and a base interconnecting the two legs; and the sealing member is arranged at a free end of the first leg.

8. The separation device according to claim 1, wherein a diaphragm is received between the nozzle discs.

9. A hydraulically damping mount for mounting a motor vehicle unit, the hydraulically damping mount comprising: a support, and a supporting mount connected to the support by a supporting spring made of an elastomeric material, wherein the supporting spring delimits the working chamber which is separated from the compensation chamber by the separation device according to claim 1, and the working chamber and the compensation chamber are filled with a fluid and are connected to one another via the damping channel.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 a vertical section through a hydraulically damped mount having a separating device; and

(2) FIG. 2 an enlarged view of the separating device shown in FIG. 1.

DETAILED DESCRIPTION

(3) FIG. 1 shows a hydraulically damping mount 10 which is used to mount a motor vehicle unit, which is not shown, such as a motor vehicle engine or transmission, on a motor vehicle body, which is not shown.

(4) The hydraulically damping mount 10 has a supporting mount 12 and a support 14, which are connected to each other by a supporting spring 16 made of an elastomeric material. A bolt 13 is inserted in the supporting mount 12 to fasten a motor vehicle unit that is not shown. The supporting spring 16 absorbs the static loads and provides acoustic insulation.

(5) The supporting mount 12, the support 14 and the supporting spring 16 delimit a working chamber 18, which is separated from a compensation chamber 22 by a separating device 20. The compensation chamber 22 is delimited by a compensating diaphragm 24. The working chamber 18 and the compensation chamber 22 are filled with a fluid. The separating device 20 has a damping channel 26, which connects the working chamber 18 and the compensating chamber 22 in a liquid-conducting manner.

(6) Via the damping channel 26, low-frequency, large-amplitude vibrations introduced by the motor vehicle unit are damped or absorbed. The vibrations introduced lead to a movement of the supporting spring 16, whereby a hydraulic pressure is built up within the working chamber 18. As a result of the pressure, the fluid flows from the working chamber 18 via the damping channel 26 into the compensation chamber 22. Due to the small diameter of the damping channel 26 and the resulting high mechanical transmission, which results from the equivalent displaced cross-section of the supporting spring 16 in relation to the cross-section of the damping channel, the vibrations introduced are damped or absorbed.

(7) As can be seen in FIG. 2, the separating device 20 has a first nozzle disc 28 and a second nozzle disc 30 made of a first material. The first material may be a plastic, especially a fibre-reinforced plastic. Between the nozzle discs 28, 30 there is a diaphragm 32 made of an elastomeric material which is clamped between the nozzle discs 28, 30 at the edges.

(8) The diaphragm 32 serves to decouple high-frequency, low-amplitude vibrations, i.e. in the acoustically relevant range, by vibrating at high-frequency, low-amplitude vibrations, whereby damping is decoupled via the damping channel 26.

(9) In order to allow a back and forth flow between the two chambers, both nozzle discs 28, 30 are provided with an opening each (not shown), through which the fluid can flow into the damping channel 26 and/or out of the damping channel 26.

(10) The second nozzle disc 30 has a receiving opening 34 into which the first nozzle disc 28 is inserted. The first nozzle disc 28 is inserted into the receiving opening 34 by means of an interference fit.

(11) As can be seen in FIG. 2, the first nozzle disc 28 divides the damping channel 26 into a first channel section 36 and a second channel section 38. The two channel sections 36, 38 are arranged one above the other.

(12) The first nozzle disc 28 has a circumferential channel 40 on the outer circumferential side which abuts against an inner circumferential wall 42 of the receiving opening 34 and forms the first channel section 36. The channel 40 is approximately C-shaped and has a first leg 44, a second leg 46 and a base 48 connecting the two legs 44, 46 to each other, the first leg 44 separating the two channel sections 36, 38 from each other.

(13) In order to seal the two channel sections 36, 38 from one another, the first nozzle disc 28 has a sealing member 50 made of a second material, which rests against the inner circumferential wall 42 of the receiving opening 34 in a sealing manner. The sealing member 50 is arranged at a free end 52 of the first leg 44 and, in the present case, is designed as a sealing edge surrounding the first nozzle disc 28, in particular the first leg 44. Alternatively, the sealing member 50 may be designed as a sealing lip. There is an interference fit between the inner circumferential wall 42 and the sealing member 50.

(14) In order to achieve improved sealing of the two channel sections 36, 38, the receiving opening 34 has a circumferential shoulder 54 against which the sealing member 50 rests.

(15) The sealing member 50 is made of a thermoplastic elastomer. This allows the first nozzle disc 28 and the sealing member 50 to be manufactured using the two-component injection moulding process. The sealing member 50 injection-moulded onto the first nozzle disc 28 using the two-component injection moulding process can thus be manufactured cost-effectively and reliably seals the two channel sections 36 and 38 from one another. This prevents internal leakage, so that the hydraulically damping mount 10 has improved damping and thus better performance.

(16) As can also be seen in FIG. 1, an idling channel 56, which can also be referred to as an absorber channel and which can be opened or closed by means of a switching device 58, is introduced into the separating device 20.

(17) In the open position, the idling channel 56 reduces the dynamic rigidity of the mount when the engine is idling. In the open position, a liquid column can oscillate within the idling channel 56, so that the high-frequency engine vibrations occurring during engine idling are transmitted in a significantly mitigated form to a motor vehicle body (not shown) due to the small effective spring rate.

(18) When the absorber channel 56 is closed, the hydraulic damping mount 10 operates like a conventional mount by damping low-frequency, large-amplitude vibrations by a fluid displacement within the damping channel 26 and by isolating or decoupling high-frequency, small-amplitude vibrations by means of the diaphragm 32.

(19) The switching device 58 has a spring element 60 connected to the compensating diaphragm 24 and supported by a mount cover 62. The spring element 60 presses the compensating diaphragm 24 against the separation device 20 to close the idling channel 56. In order to open the idle channel 56, the switching device 58 is connected to a vacuum source (not shown) via a port 64, wherein by applying a vacuum, the compensating diaphragm 24 is moved away from the separating device 20 against the force of the spring element 60 in order to open the idling channel 56.

(20) The mount cover 62 is attached to the support 14 by means of a clip connection. The mount cover 62 supports the hydraulically damping mount 10 on a vehicle body (not shown). Furthermore, the hydraulically damping mount 10 is enclosed by a housing 66, which protects the mount 10 from thermal impacts.