JP2008544178A - Liquid filled mount with electrically switchable bypass - Google Patents

Abstract

1. The liquid enclosure mount (2) has a working chamber (12a) and an equilibration chamber (12b), both chambers being connected in parallel to at least one throttle passage (14) and the throttle passage. They communicate with each other via a bypass passage (18) which can be closed by a valve. The throttle passage (16) and the bypass passage (18) are arranged together with a valve in a separation plate (14) that separates both chambers (12a, 12b). The volume (12) of the working chamber (12a) and the equilibrium chamber (12b) filled with the pressure fluid can be changed alternately by loading and releasing the load on the rubber member (4). Sustained current requirements of the bypass circuit should be avoided. 2. The solenoid valve includes a linear actuator and a slider (20) that can move laterally. The linear actuator includes a magnetic circuit (28) having a coil (34) that can be energized and a permanent magnet (30). In the separation plate (14) made of synthetic resin or nonmagnetic metal, at least one small plate or pin (38a,...) Made of a ferromagnetic material is provided at at least one end position of the slider (20). It arrange | positions so that it may enter in the attracting area | region of a magnetic circuit (28). Continuous energization of the bypass valve is not necessary. The coil (34) is preferably fed via an axially attachable plug contact (36). 3. Especially for use as a car engine mount.

Description

Field of Use A liquid-filled mount with an electrically switchable bypass as described in the premise of claim 1 is known. Such liquid encapsulated mounts are used in particular as automobile engine mounts. In a predetermined running state, a bypass is opened in the engine mount and fluid can flow through the bypass. Thereby, other situations occur in the mount that favor the anti-vibration properties.

Prior Art As an example in this regard, reference is made to a liquid-sealed mount described in Patent Document 1 and capable of switching a bypass. The liquid-filled mount has a working chamber (10a) and an equilibrium chamber (10b), both of which are connected in parallel to at least one throttle passage (14) and the throttle passage. Communicate with each other via a closeable bypass passage (18). The volume of the working chamber (10a) and the equilibrium chamber (10b) filled with the pressure fluid can be changed alternately by loading and releasing the load on the rubber member (4). The solenoid valve includes a slider (22) having a lateral hole (20). The electromagnetic drive device of the slider (22) that can be operated sideways is a linear drive device. In the case of this linear drive device, a Lorentz force is applied to a conductor through which a current flows in a magnetic field. In order to securely hold the slider at the end position in each case, continuous energization is necessary. Accordingly, apart from the fact that electricity consumption is not desired, it has been found that the effectiveness of bypass switching is uncertain in the event of a somewhat short power failure. In the case of a coil that preferably moves with the slider, there is a problem with the wiring. The wiring must be flexible and have a certain amount of sag. It is not shown how the wall of the mount should be ensured in the energized area.
EP1426651A1

The object of the invention is to improve the structure described in EP1426651A1. In particular, continuous current requirements for bypass switching should be avoided.

Solution and effect This problem is substantially solved by claim 1. Preferred embodiments and developments are evident from the features of the dependent claims.

  The bypass slider is (permanently) magnetically fixed at its end position. For this reason, it is not necessary to hold the drive coil of the slider without interruption under current. Energization is only necessary to change position from open to closed or vice versa. Thereby, the thermal load on the coil is reduced. A high coil current can be supplied for a short time to overcome the attractive force to the end position. Because the current load is only for a short time, it is not necessary to design the coil to be 100% ED (ED is the operating time).

  Since the magnetic circuit already comprises permanent magnets, it is sufficient if the platelets or pins are made of a ferromagnetic material in order to fix the slider in the respective end position.

  Instead of being made of a ferromagnetic material, the platelets or pins may be made of a permanent magnet material that holds the ferromagnetic magnetic circuit fixed. This is particularly significant when the magnetic circuit of the slider has an induction coil (shorted) instead of a permanent magnet.

  If the power supply of the coil is guided directly to the external space via a plug contact arranged on the separating plate, there is no need to worry about the problem of hydraulic sealing. Further, since the contacts can be inserted, the assembly of the liquid enclosure mount is simplified.

  Since there is no hole in the closing tongue, the closing tongue can be formed relatively short. Thereby, the necessary installation space can be reduced.

  If non-circular (eg, laterally oriented oval) holes are used, the required slider stroke is shortened and the drive unit is smaller and less expensive.

  The magnetic circuit is composed of ferromagnetic thin plate parts except for permanent magnets. Since the joining edge of the thin plate component is toothed, it can be easily joined.

  In order to prevent damage to the mechanically sensitive coil, the coil is embedded in a synthetic resin material.

Details Next, the present invention will be described based on embodiments.

  The liquid enclosure mount 2 according to the invention has in principle a basic structure similar to the liquid enclosure mount known from FIG. 1 of EP1426651A1. The elastic elastic element 4 which is elastic and rotationally elastic is connected on the one hand to the first connecting member 6 a in the axial direction and on the other hand to the upper region of the cylindrical wall of the pot-type housing 8. At least one second connection member 6 b is attached to the lower region of the pot-type housing 8. The elastic element 4 and the equilibrium diaphragm 10 surround the hydraulic space 12. The hydraulic space is divided into a working chamber 12a and an equilibrium chamber 12b by a separation plate (partition wall, nozzle plate) 14. In accordance with the present invention, the separator plate 14 is a complex part having various components and performing a number of corresponding functions. The separation plate 14 has a throttle passage 16 through which the working chamber 12a and the equilibrium chamber 12b communicate with each other. A bypass passage (bypass opening) 18 is provided in parallel to the throttle passage 16. The opening of the bypass 18 formed as a horizontal hole can be opened and closed by an electrically drivable slider 20. That is, the bypass 18 can be selectively connected or disconnected by the slider 20. This switching can be performed gradually. Thereby, especially in idling operation, the mounting strength of the elastically supported engine can be somewhat reduced by opening the bypass 18 in the separation plate 14.

  As is apparent from the separating plate 14 shown by perspective in FIGS. 2-5 and cut in FIGS. 3-6, the throttle passage 16 is here formed as an annular passage. One end 16a of the throttle passage opens to the working chamber 12a, and the other end 16b opens to the equilibrium chamber 12b. In FIG. 2, the bypass opening 18 is covered with a tongue piece 20 a of the slider 20. FIG. 3 shows the open bypass 18 (slider 20 is retracted). FIG. 4 shows the bypass 18 closed by the tongue 20 a of the slider 20.

  Further, as shown in FIGS. 2 and 4, the separation plate 14 is partially formed as a perforated screen 22 (holes 22a, 22b...). The surface of the perforated screen is covered with a decoupling diaphragm 24 (FIG. 1). The slider 20 and the connection release diaphragm 24 are held by a cover plate 26 (FIG. 1) disposed on the separation plate 14 so as to face the working chamber 12a.

  Details of the slider 20 and the "linear actuator" that drives it are important to the present invention. This “linear actuator” is composed of a ferromagnetic circuit (magnetic circuit) 28 with a permanent magnet 30 attached to the slider 20 (refer to FIGS. 5, 6 and 7 in particular). Teeth are formed at both ends of the ferromagnetic circuit 28. The teeth 28a are engaged with the teeth 20b on the corresponding toothed side surface of the slider 20 (FIG. 7). The “linear actuator” further includes a coil 34 embedded in the synthetic resin material 32. This coil is in the ferromagnetic circuit 28 and is fixedly attached to the separating plate 14. Electric power is supplied to the electric coil 34 via a plug contact 36 which is on the separation plate 14 and guided directly to the external space.

  Due to the fact that the coil 34 is fixed on the separating plate 14, the slider 20 can move relative to the coil 34 together with the ferromagnetic circuit 28 and the permanent magnet 30. When the coil 34 is energized, a force (Lorentz force) acts in the vertical direction of the slider 20 perpendicular to the magnetic field and perpendicular to the current I (right method rule). Reversing the polarity results in the opposite direction of motion.

  The magnetic field need not be very uniform. It is also possible to intentionally form non-uniformly so that the magnetic fields for the positions “bypass opening” and “bypass closing” are larger than those in the middle range of motion. Thereby, the force can be increased to overcome somewhat greater static friction.

  The slider 20, particularly the tongue piece 20a, is formed very thin. As a result, the liquid displacement in the region of the bypass opening is relatively small.

  At the end of the reciprocating movement, the movement of the slider 20 is limited by a stopper. In FIG. 3, the stopper is formed by holding plates 38a and 38b. The holding platelets 38a and 38b are made of a ferromagnetic material (soft iron or permanent magnet), and the slider 20 is held at its respective end position (open position or closed position) by the holding platelets. At this time, since the holding plate reaches the attracting area of the permanent magnet, it is not necessary to continuously maintain the energization of the drive coil 34.

1 is a longitudinal sectional view of a liquid-sealed mount according to the present invention. 2 to 7 show details of the bypass according to the present invention, and are perspective views except for FIG. FIG. 2 shows the separation plate together with the slider. 3 to 6 are sectional views of the separation plate, respectively, and FIG. 3 is a longitudinal sectional view of the slider (with the bypass opened). It is a longitudinal cross-sectional view of a slider (with the bypass closed). It is a cross-sectional view of a slider. It is a cross-sectional view of a slider. 1 shows a “linear actuator”, ie a slider with a ferromagnetic circuit, a permanent magnet and a stationary coil.

Explanation of symbols

2 Liquid Enclosed Mount, Hydraulic Engine Mount 4 Elastic Element, Rubber Member, Rubber Support 6a (First) Connection Member 6b (Second) Connection Member 8 Pot Type Housing 10 Equilibrium Diaphragm, (Roll) Diaphragm 12 Hydraulic Space, Pressure fluid 12a Working chamber 12b Equilibrium chamber 14 Separation plate, partition, nozzle plate 16 Restriction passage, damping passage, annular passage 16a, 16b End of restriction passage 18 Bypass (opening), bypass passage, lateral hole 20 Slider 20a (of slider 20 ) Tongue piece, closing tongue piece 20b Side surface (of slider 20), tooth (on side surface of slider 20) 22 Perforated screen 22a, 22b (perforated screen 22) hole 24 Connection release diaphragm 26 Cover plate 28 Ferromagnetic circuit, Magnetic circuit 28a (of ferromagnetic circuit 28) Teeth 30 Permanent magnet 32 Synthetic resin material (Co Le 34 with a) rectangular part 34 a coil 36 plug contacts 38a, 38b retained platelets pin

Claims (7)

The working chamber (12a) and the equilibrium chamber (12b) have at least one throttle passage (16) disposed in a separation plate (14) separating both chambers (12a, 12b). And communicate with each other via a bypass passage (18) connected in parallel to the throttle passage and closed by a solenoid valve,
The volume (12) of the working chamber (12a) and the equilibrium chamber (12b) filled with the pressure fluid can be changed alternately by loading and releasing the load on the rubber member (4),
A magnetic circuit (28) having a coil (34) and a permanent magnet (30) through which a solenoid valve can be energized;
A slider (20) that can be driven laterally,
In a liquid-filled mount (2) with an electrically switchable bypass (18), in particular for use as an automotive engine mount,
The separator (14) is made of synthetic resin or non-magnetic metal and contains the magnetic circuit (28);
The separating plate (at least one platelet or pin (38a,...) Made of a ferromagnetic material enters the attractive area of the magnetic circuit (28) at at least one end position of the slider (20). 14) A liquid-sealed mount (2), characterized in that it is arranged within.   The liquid-filled mount according to claim 1, characterized in that at least one platelet or at least one pin (38a, ...) is made of a ferromagnetic material or is a permanent magnet.   3. The liquid-filled mount according to claim 1, wherein the coil (34) is fed via a plug contact (36) which can be mounted in the axial direction.   4. A liquid-filled mount according to claim 1, wherein the slider (20) comprises a thin closing tongue (20a) with or without holes.   5. The liquid-filled mount according to claim 1, wherein the hole of the bypass passage (18) has a circular, rectangular or elliptical cross section.   At least a part of the magnetic circuit (28) is made of a ferromagnetic thin plate component, and the thin plate component is engaged with teeth (20b) provided on the side surface of the slider (20) by the teeth (28a). The liquid enclosure mount according to any one of claims 1 to 5.   The electrical coil (34) of the magnetic circuit (28) is embedded in a synthetic resin material to form a cuboid or a round part (32). Liquid filled mount.

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