Release system for a clutch assembly

• US 6,622,836 B2
• Filed: 11/16/2001
• Issued: 09/23/2003
• Est. Priority Date: 11/21/2000
• Status: Expired due to Fees

• Current Assignee: ZF Friedrichshafen AG (Zeppelin - Stiftung der Stadt Friedrichshafen)
• Original Assignee: Mannesmann Sachs AG (Zeppelin - Stiftung der Stadt Friedrichshafen)
• Inventors: Otto, Thomas, Voit, Herbert, Hirschmann, Frank, Wehner, Manfred
• Primary Examiner(s): RODRIGUEZ, SAUL
• Application Number:
  US09/998,577
• Publication Number:
  US 20020060116A1
• Time in Patent Office: 676 Days
• Field of Search: 192/18.A, 192/91.A, 192/13.R, 192/12.C, 192/85.CA, 192/89.24, 192/98, 192/99.S
• US Class Current: 192/18.00A
• CPC Class Codes: F16D 2121/02 Fluid pressure
• CPC Class Codes: F16D 2125/06 Pistons
• CPC Class Codes: F16D 25/083 Actuators therefor F16D25/085 - F16D25/087 take precedence
• CPC Class Codes: F16D 65/186 with full-face force-applying member, e.g. annular
• CPC Class Codes: F16D 67/02 Clutch-brake combinations

Abstract

A release system for a clutch assembly comprises a release slide, which is or can be connected to a stored-energy element of the clutch assembly to execute release movements, and at least one brake element, which can move along with the release slide during the execution of release movements. This brake element can be brought into braking interaction with an opposing brake element which is or can be connected in an essentially nonrotatable manner to a clutch output shaft, where the release slide and the minimum of one brake element form a piston/cylinder unit with at least one fluid chamber. Pressure fluid is introduced into the minimum of one fluid chamber to produce a force which preloads or moves the minimum of one brake element relative to the release slide.

Claims

1. A release system for a clutch assembly having a stored energy element, said system comprising

a release slide which is connectable to the stored energy element to execute release movements, said release slide having a rotational axis,

at least one brake element which, with said release slide, forms a piston cylinder unit having at least one fluid chamber between said release slide and said brake element, said piston cylinder unit being movable as a unit during the execution of release movements,

an opposing brake element which is nonrotatably connectable to a clutch output shaft, wherein said at least one brake element can be pressed against said opposing brake element, and

means for introducing pressure fluid into said at least one fluid chamber to load said at least one brake element relative to said release slide.

2. A release system as in claim 1 wherein said at least one brake element is pressed against said opposing brake element by introducing pressure fluid into said at least one fluid chamber.

3. A release system as in claim 1 wherein said release slide comprises a plurality of cylindrical chambers arranged in a circle about said rotational axis, said at least one brake element comprising a plurality of pistons slidably received in respective said cylindrical chambers.

4. A release system as in claim 1 wherein said release slide comprises an annular cylindrical chamber concentric to said rotational axis, said at least one brake element comprising a tubular section which is slidably received in said annular cylindrical chamber.

5. A release system as in claim 1 wherein said means for introducing pressure fluid into said at least one fluid chamber comprises a pressure fluid feed connection provided on each said at least one brake element.

6. A release system as in claim 1 wherein pressure fluid can be introduced into said at least one chamber essentially only when said clutch assembly is actuated beyond a point associated with essentially complete release of the clutch.

7. A release system as in claim 6 wherein, during actuation of said clutch assembly up to said point associated with essentially complete release of the clutch, essentially no fluid pressure which could move said brake element relative to said release element is introduced into said chamber.

8. A drive system comprising a clutch assembly and a release assembly, said release assembly comprising

a release slide which is connectable to the stored energy element to execute release movements, said release slide having a rotational axis,

at least one brake element which, with said release slide, forms a piston cylinder unit having at least one fluid chamber between said release slide and said brake element, said piston cylinder unit being movable as a unit during the execution of release movements,

an opposing brake element which is nonrotatably connectable to a clutch output shaft, wherein said at least one brake element can be pressed against said opposing brake element, and

means for introducing pressure fluid into said at least one fluid chamber to load said at least one brake element relative to said release slide, said pressure fluid being introduced into said at least one fluid chamber only when said clutch has been actuated beyond a point associated with essentially complete release of the clutch.

9. A drive system as in claim 8 wherein, when said clutch assembly has not been actuated to said point associated with essentially complete release of the clutch, essentially no fluid pressure which could move said brake element relative to said release slide can be introduced into said chamber.

10. A drive system as in claim 9, wherein said at least one fluid chamber is connected to a fluid reservoir.