Hydraulic temperature compensator and hydraulic lift transmitter

Patent metadata

Field	Value
Publication number	US-9488194-B2
Application number	US-201113822831-A
Country	US
Kind code	B2
Filing date	Aug 22, 2011
Priority date	Sep 13, 2010
Publication date	Nov 8, 2016
Grant date	Nov 8, 2016

Abstract

The hydraulic temperature compensator has at least one longitudinally extensible hydraulic chamber and a gas-filled chamber which is at least partly enclosed by the hydraulic chamber, wherein the hydraulic chamber is subdivided into a first sub-chamber and a second sub-chamber which are hydraulically connected to each other by at least one throttle point and wherein the second sub-chamber adjoins the gas-filled chamber. The stroke transmitter has at least the hydraulic temperature compensator, a stroke actuator acting on the temperature compensator, and a further hydraulic chamber which is fluidically connected to the first sub-chamber of the hydraulic chamber of the temperature compensator, wherein the further hydraulic chamber is in fluidic connection with a displaceably mounted actuating element.

First claim

The invention claimed is:

1. A hydraulic temperature compensator, comprising:
a gas-filled chamber;
a longitudinally extensible first hydraulic chamber at least partly enclosing the gas filled chamber, the hydraulic chamber comprising a first sub-chamber and a second sub-chamber, the second sub-chamber adjoining the gas-filled chamber, the first hydraulic chamber being formed by:
an outer wall having an open first end;
an inner wall having an open end, the inner wall being contactlessly inserted into the outer wall, the inner wall separating the second sub-chamber from the gas-filled chamber such that the inner wall at least partially defines the gas-filled chamber;
a partition member having an open end and a partitioning section, the partitioning section being contactlessly inserted between the outer wall and the inner wall, the partitioning section separating the first sub-chamber from the second sub-chamber, the partitioning section having a throttle point to connect the first and second sub-chambers to each other;
a hydraulic port coupled to the first sub-chamber for providing a fluid passage to a second hydraulic chamber associated with a movable actuating element;
a common cover at a first side of the first hydraulic chamber and hermetically attached to the open end of the inner wall, the open end of the outer wall, and the open end of the partition member, the cover being longitudinally movable in response to a longitudinal force imposed on the cover by an actuator;
a base coupled to or formed by a second end of the outer wall, the base being rigidly fixed; and

wherein a longitudinal movement of the cover causes a compression of the first sub-chamber of the first hydraulic chamber, which forces a fluid flow from the first sub-chamber to the second hydraulic chamber associated with the movable actuating element via the hydraulic port.

2. The hydraulic temperature compensator as claimed in claim 1 , wherein the inner wall and the outer wall are each embodied as a bellows having an open end side, and the open end sides of the bellows correspond respectively with the open ends of the inner and outer walls.

3. The hydraulic temperature compensator as claimed in claim 1 , wherein the partition member is embodied as a hollow cylinder having an open end side corresponding to the open end of the partition.

4. The hydraulic temperature compensator as claimed in claim 1 , wherein the outer wall is hermetically attached to the partition member and the partition member is hermetically attached to the cover.

5. The hydraulic temperature compensator as claimed in claim 1 , wherein the outer wall and the partition member are hermetically attached to the cover individually.

6. The hydraulic temperature compensator as claimed in claim 1 , wherein a compression spring element is accommodated in the gas-filled chamber.

7. The hydraulic temperature compensator as claimed in claim 1 , wherein the first hydraulic chamber has a unidirectional valve, which enables only a flow from the second sub-chamber into the first sub-chamber.

8. The hydraulic temperature compensator as claimed in claim 1 , wherein the first hydraulic chamber has a unidirectional valve, and the second sub-chamber is connected to the first sub-chamber by both the throttle point and the unidirectional valve.

9. The hydraulic temperature compensator as claimed in claim 7 , wherein the unidirectional valve is a flutter valve.

10. The hydraulic temperature compensator as claimed in claim 1 , wherein the first hydraulic chamber is filled with a substantially incompressible fluid.

11. The hydraulic temperature compensator as claimed in claim 1 , wherein the first hydraulic chamber is filled with oil filled under vacuum.

12. A stroke transmitter, comprising:
a hydraulic temperature compensator, comprising:
a gas-filled chamber;
a longitudinally extensible first hydraulic chamber at least partly enclosing the gas filled chamber, the first hydraulic chamber comprising a first sub-chamber and a second sub-chamber, the second sub-chamber adjoining the gas-filled chamber, the first hydraulic chamber being formed by:
an outer wall having an open end;
an inner wall having an open end, the inner wall being contactlessly inserted into the outer wall, the inner wall separating the second sub-chamber from the gas-filled chamber such that the inner wall at least partially defines the gas-filled chamber; and
a partition member having an open end and a partitioning section, the partitioning section being contactlessly inserted between the outer wall and the inner wall, the partitioning section separating the first sub-chamber from the second sub-chamber, the partitioning section having a throttle point to connect the first and second sub-chambers to each other; and
a common cover hermetically attached to the open end of the inner wall, the open end of the outer wall and the open end of the partition member:

a stroke actuator configured to impose a longitudinal force on the cover of the temperature compensator to cause a longitudinal movement of the cover; and
a second hydraulic chamber fluidically connected to the first sub-chamber of the first hydraulic chamber of the temperature compensator, the second hydraulic chamber being in fluidic connection with a displaceably mounted actuating element;

wherein a longitudinal movement of the cover imparted by the stroke actuator causes a compression of the first sub-chamber of the first hydraulic chamber, which forces a fluid flow from the first sub-chamber to the second hydraulic chamber via the hydraulic port.

13. The stroke transmitter as claimed in claim 12 , wherein the stroke actuator and the temperature compensator are mounted between two thrust bearings.

14. The stroke transmitter as claimed in claim 12 , wherein the stroke transmitter is an injector stroke transmitter.

Assignees

• Bachmaier Georg
• Ebelsberger Gerit
• Fischer Bernhard
• Höge Michael
• Magori Erhard
• Siemens Ag

Inventors

• Bachmaier Georg
• Ebelsberger Gerit
• Fischer Bernhard
• Höge Michael
• Magori Erhard

Classifications

• F02M61/167 Primary

  Means for compensating clearance or thermal expansion · CPC title

• F02M63/0026

  using piezoelectric or magnetostrictive actuators · CPC title

• F02M63/0057

  Means for avoiding fuel contact with valve actuator, e.g. isolating actuators by using bellows or diaphragms · CPC title

• F02M2200/708

  with hydraulic chambers formed by a movable sleeve · CPC title

• F02M2200/705

  with means for filling or emptying hydraulic chamber, e.g. for compensating clearance or thermal expansion · CPC title