Hydraulic antivibrating device

Patent metadata

Field	Value
Publication number	US-10260593-B2
Application number	US-201715660537-A
Country	US
Kind code	B2
Filing date	Jul 26, 2017
Priority date	Jul 26, 2016
Publication date	Apr 16, 2019
Grant date	Apr 16, 2019

Abstract

Vibration damping device comprising two frames and an elastomer body that connects frames together and which delimits a first hydraulic chamber that communicates with a second hydraulic chamber that can be deformed by a constricted passage. An electromagnetic actuator, that controls the vibration damping behavior of the device, comprises a a permanent magnet holding machanism.

First claim

The invention claimed is:

1. The hydraulic vibration damping device intended to be inserted for the purposes of damping between first and second rigid elements, with this vibration damping device comprising:
first and second frames intended to be fixed to the two rigid elements to be joined,
an elastomer body that connects first and second frames together and which delimits at least partially a first hydraulic chamber,
a second hydraulic chamber which is delimited by a deformable wall and which communicates with the first hydraulic chamber by the intermediary of a constricted passage, with the first and second hydraulic chambers and with the constricted passage forming a hydraulic circuit filled with liquid,
an electromagnetic actuator suited to control a vibration damping behaviour of the vibration damping device,
wherein said actuator comprises:
a magnetic circuit including an actuating member mobile between a first position and a second position,
at least one spring biasing the actuating member with a first force directed towards the first position,
a permanent magnet creating a permanent magnetic field in the magnetic circuit and biasing the actuating member with a second force directed towards the second position, with the first force being greater than the second force when the actuating member is in the first position and with the second force being greater than the first force when the actuating member is in the second position,
at least one coil electrically supplied by a control device, with the control device being suited to selectively either increase said magnetic field in order to have said actuating member pass from the first to the second position against the bias of the spring, or to decrease said magnetic field in order to have said actuating member pass from the second to the first position under the effect of the spring,

wherein the actuator comprises:
a ferromagnetic shell in the shape of a U having a base and two wings extending to the free ends on either side of a central axis, with the actuating member comprising a pallet made of a ferromagnetic material which is mobile according to the central axis and arranged between the free ends of the two wings,
a core made of ferromagnetic material integral with the shell and extending longitudinally along the central axis between a first end close to the base and a second end close to the pallet of the actuating member, with the pallet being separated from the second end of the core in the first position and in contact with the second end of the core in the second position, and with the coil being wound around said core.

2. The vibration damping device according to claim 1 , wherein said actuator is adapted to selectively block or leave free a mobile wall which partially delimits the first hydraulic chamber.

3. The vibration damping device according to claim 1 , wherein the actuating member is mobile in translation over a course between 0.5 and 2 mm, advantageously between 0.7 and 1.5 mm, between the first and second positions.

4. The vibration damping device according to claim 1 , wherein the control device is suited to generate a pulse of current in the coil, either in a first direction, or in a second direction opposite the second direction, in order to selectively either have said actuating member pass from the first to the second position, or to have said actuating member pass from the second to the first position.

5. The vibration damping device according to claim 4 , wherein said pulse of current has a duration less than 100 ms.

6. The vibration damping device according to claim 4 , wherein said pulse of current has a power between 0.1 W and 1.5 W.

7. The vibration damping device according to claim 1 , wherein the permanent magnet is inserted between the core and the base of the shell.

8. The vibration damping device according to claim 1 , wherein said source of energy comprises at least one battery.

9. The vibration damping device as claimed in claim 1 , comprising furthermore a vibration sensor integral with one of the first and second frames.

10. The hydraulic vibration damping device intended to be inserted for the purposes of damping between first and second rigid elements, with this vibration damping device comprising:
first and second frames intended to be fixed to the two rigid elements to be joined,
an elastomer body that connects first and second frames together and which delimits at least partially a first hydraulic chamber,
a second hydraulic chamber which is delimited by a deformable wall and which communicates with the first hydraulic chamber by the intermediary of a constricted passage, with the first and second hydraulic chambers and with the constricted passage forming a hydraulic circuit filled with liquid,
an electromagnetic actuator suited to control a vibration damping behaviour of the vibration damping device,
wherein said actuator comprises:
a magnetic circuit including an actuating member mobile between a first position and a second position,
at least one spring biasing the actuating member with a first force directed towards the first position,
a permanent magnet creating a permanent magnetic field in the magnetic circuit and biasing the actuating member with a second force directed towards the second position, with the first force being greater than the second force when the actuating member is in the first position and with the second force being greater than the first force when the actuating member is in the second position,
at least one coil electrically supplied by a control device, with the control device being suited to selectively either increase said magnetic field in order to have said actuating member pass from the first to the second position against the bias of the spring, or to decrease said magnetic field in order to have said actuating member pass from the second to the first position under the effect of the spring,
the vibration damping device comprising furthermore a pneumatic chamber which is delimited towards the actuator by a bottom provided with an orifice and which is separated from the first hydraulic chamber by a flexible wall, with the actuating member being suited for closing off said orifice under the bias of the spring when the actuating member is in the first position, with the spring being suited to allow the actuating member to temporarily open said orifice in case of excessive pressure in the pneumatic chamber.

11. The hydraulic vibration damping device intended to be inserted for the purposes of damping between first and second rigid elements, with this vibration damping device comprising:
first and second frames intended to be fixed to the two rigid elements to be joined,
an elastomer body that connects first and second frames together and which delimits at least partially a first hydraulic chamber,
a second hydraulic chamber which is delimited by a deformable wall and which communicates with the first hydraulic chamber by the intermediary of a constricted passage, with the first and second hydraulic chambers and with the constricted passage forming a hydraulic circuit filled with liquid,
an electromagnetic actuator suited to control a vibration damping behaviour of the vibration damping device,
wherein said actuator comprises:
a magnetic circuit including an actuating member mobile between a first position and a second position,
at least one spring biasing the actuating member with a first force directed towards the first position,
a permanent magnet creating a permanent magnetic field in the magnetic circuit and biasing the actuating member with a second force directed towards the second position, with the first force being greate

Assignees

• Hutchinson

Inventors

• Lemaire Gabriel
• Bellamy Alain

Classifications

• F16F13/10

  the wall being at least in part formed by a flexible membrane or the like (F16F13/14 - F16F13/18 take precedence) · CPC title

• F16F2228/066

  Variable stiffness · CPC title

• F16F13/264 Primary

  comprising means for acting dynamically on the walls bounding a working chamber · CPC title

• Y02E10/28

  Cross-Sectional Technologies · mapped topic

• F16F2230/18

  Control arrangements · CPC title