Clutch assembly configured to prevent unwanted jolt during engagement

Patent metadata

Field	Value
Publication number	US-10738839-B2
Application number	US-201615756893-A
Country	US
Kind code	B2
Filing date	Aug 1, 2016
Priority date	Sep 2, 2015
Publication date	Aug 11, 2020
Grant date	Aug 11, 2020

Abstract

A clutch arrangement is formed with drive-side and, output-side clutch elements and a clutch piston for operative connection and disengagement between the drive-side and output-side clutch elements. Associated with at least two clutch elements is an elastically deformable clutch element working mechanism through which the corresponding clutch elements can be acted upon in direction away from one another by an axial force to assist disengagement of the drive-side and output-side clutch elements. The clutch element working mechanism provides a considerable change in the gradient of the axial force exerted on the clutch elements as a result of even a small change of shape of the clutch element working mechanism so that a sharply rising axial force of the clutch element working mechanism works against the clutch piston.

First claim

The invention claimed is:

1. A clutch arrangement comprising:
at least two drive-side clutch elements;
output-side clutch elements;
a clutch piston configured to produce an operative connection between the drive-side clutch elements and the output-side clutch elements and to disengage the operative connection between the at least two drive-side clutch elements and the output-side clutch elements; and
an elastically deformable clutch element working mechanism associated with the at least two clutch elements and configured to act upon the at least two clutch elements in a direction to separate the two drive-side clutch elements away from one another by an axial force to assist the disengagement of the at least two drive-side clutch elements and the output-side clutch elements;
wherein the clutch element working mechanism is configured such that there is a change in a gradient of the axial force exerted on the at least two clutch elements as a result of a change of shape of the clutch element working mechanism so that a rising axial force of the clutch element working mechanism works against the clutch piston as the clutch piston approaches an engagement position,
wherein the at least two drive-side clutch elements and the output-side clutch elements have at one of their radial circumferential regions a toothing for rotatably connecting to a clutch element carrier and the at least two drive-side clutch elements are rotatably connected with the clutch element working mechanism that has a plurality of deformation elements, each of which has a receiving region engaging in a cutout of a clutch element and deformation regions which adjoin the receiving region viewed in running direction of a median axis parallel to the central axis and which are provided for axial contact of the at least two drive-side clutch elements, and
wherein at least the deformation regions of each individual deformation element are configured in such a way that there is the change in the gradient of the axial force exerted on the clutch elements as a result of a change in shape at the deformation elements so that the rising axial force of the deformation elements acts against the clutch piston as the clutch piston moves increasingly closer to the engagement position,
wherein the deformation elements which are provided with at least one deformation region in running direction of the respective median axis proceeding in each instance from their receiving region which engages in a cutout of a clutch element, wherein first deformation elements of the deformation elements having identically dimensioned deformation regions are arranged on both sides of the receiving region and second deformation elements of the deformation elements in which at least one deformation region has smaller dimensions than at least one of further deformation region and the deformation regions of the first deformation elements,
wherein a combination of deformation elements with the identically dimensioned deformation regions and deformation elements with the at least one smaller-dimensioned deformation region are used with the clutch elements such that the deformation elements having, respectively, the identically dimensioned deformation regions come in contact by their axial ends with an adjacent clutch element, while the deformation elements formed with at least one smaller-dimensioned deformation region come in contact by their axial ends of their smaller deformation regions with the axial ends of deformation regions of respective adjacent deformation elements, which deformation regions are smaller-dimensioned.

2. The clutch arrangement according to claim 1 ,
wherein the clutch element working mechanism is arranged with a radial offset relative to a contact zone provided at the clutch piston,
wherein the contact zone protrudes in a direction of a respective clutch element that is adjacent in engagement direction or disengagement direction, and
wherein the clutch element is provided with a cross section in the engagement direction or the disengagement direction so that a change in the axial force exerted on the clutch element during the engagement process or disengagement process brings about a change in shape at the clutch element, which results in a change in an effective friction radius between the contact zone of the clutch piston and the clutch element.

3. The clutch arrangement according to claim 1 , wherein the deformation elements are received in a cutout of the toothing of the at least of one clutch element with the respective associated clutch element carrier and are secured against exiting from the cutout of the toothing by a loss prevention arrangement.

4. The clutch arrangement according to claim 3 , wherein the respective cutout of the toothing receiving the deformation element has at least at an entrance for insertion of the deformation element at the loss prevention arrangement that engages the deformation element and which accordingly narrows the entrance.

5. The clutch arrangement according to claim 1 , wherein the deformation regions having the smaller dimensions bring about at least an axial locking of the deformation element in one of two possible running directions of the respective median axis, while the deformation regions having the larger dimensions are configured such that there is a change in the gradient of the axial force exerted on the adjacent clutch elements as a result of a change in shape at the deformation regions.

6. The clutch arrangement according to claim 1 , wherein a combination of deformation elements with the identically dimensioned deformation regions and the deformation elements with the at least one smaller-dimensioned deformation region are used with the clutch elements in case of an odd number of the clutch elements in that the deformation elements which have a smaller-dimensioned deformation region are associated with at least one clutch element or with an odd plurality of the clutch elements, while respective deformation elements having identically dimensioned deformation regions are associated with an even plurality of the clutch elements.

7. The clutch arrangement according to claim 1 , wherein a shape of the receiving region of the respective deformation element is at least substantially adapted to the shape of the toothing.

8. A clutch arrangement comprising:
at least two drive-side clutch elements;
output-side clutch elements;
a clutch piston configured to produce an operative connection between the drive-side clutch elements and the output-side clutch elements and to disengage the operative connection between the at least two drive-side clutch elements and the output-side clutch elements; and
an elastically deformable clutch element working mechanism associated with the at least two clutch elements and configured to act upon the at least two clutch elements in a direction to separate the two drive-side clutch elements away from one another by an axial force to assist the disengagement of the at least two drive-side clutch elements and the output-side clutch elements;
wherein the clutch element working mechanism is configured such that there is a change in a gradient of the axial force exerted on the at least two clutch elements as a result of a change of shape of the clutch element working mechanism so that a rising axial force of the clutch element working mechanism works against the clutch piston as the clutch piston approaches an engagement position,
wherein the deformation elements are received in a cutout of the toothing of the at least of one clutch element with the respective associated clutch element carrier and are secured against exiting from the cutout of the toothing by a loss prevention arrangement,
wherein the respective cutout of the toothing re

Assignees

• Zahnradfabrik Friedrichshafen

Inventors

• Friess Johannes
• Sasse Christoph
• Grosspietsch Wolfgang
• Ebert Angelika
• Rohm Axel
• Romeis Steffen

Classifications

• F16D13/69 Primary

  Arrangements for spreading lamellae in the released state · CPC title

• F16H45/02

  with mechanical clutches for bridging a fluid gearing of the hydrokinetic type (control of torque converter lock-up clutches F16H61/14) · CPC title

• F16H2045/0284

  Multiple disk type lock-up clutch · CPC title

• F16D25/0638

  with more than two discs, e.g. multiple lamellae · CPC title

• F16D13/52

  Clutches with multiple lamellae {; Clutches in which three or more axially moveable members are fixed alternately to the shafts to be coupled and are pressed from one side towards an axially-located member (F16D13/385 takes precedence)} · CPC title