Clutch system

Patent metadata

Field	Value
Publication number	US-10948029-B2
Application number	US-201716083906-A
Country	US
Kind code	B2
Filing date	Feb 17, 2017
Priority date	Mar 16, 2016
Publication date	Mar 16, 2021
Grant date	Mar 16, 2021

Abstract

A clutch system for coupling a drive shaft of a motor vehicle engine to a transmission input shaft of a motor vehicle transmission is disclosed. The clutch system includes a friction clutch for transmitting a torque between a torque-introducing element and a torque-discharging element. It also includes a ramp system for an axial displacement of a pressure plate of the friction clutch, wherein the ramp system has an input ramp and an output ramp, which can be turned in relation to the input ramp to change an axial extent of the ramp system. A pilot clutch, which acts on the ramp system, is provided for actuating the friction clutch based on a differential speed between the torque-introducing element and the torque-discharging element. An electromagnet for a magnetic actuation of the pilot clutch is further provided, wherein the ramp system is arranged radially within the friction clutch and/or the pilot clutch.

First claim

The invention claimed is:

1. A clutch system for coupling a drive shaft of a motor vehicle engine to a transmission input shaft of a motor vehicle transmission, comprising:
a friction clutch for transmitting a torque between a torque-introducing element and a torque-discharging element,
a ramp system for an axial displacement of a pressure plate of the friction clutch, wherein the ramp system has an input ramp and an output ramp, which can be turned in relation to the input ramp to change an axial extent of the ramp system,
a pilot clutch, which acts on the ramp system, for actuating the friction clutch based on a differential speed between the torque-introducing element and the torque-discharging element, and
an electromagnet for a magnetic actuation of the pilot clutch,
wherein the ramp system is arranged radially within the friction clutch or the pilot clutch, and
wherein the pilot clutch has a counter element coupled to the torque-introducing element and has a pressure element which is axially displaceable relative to the counter element and which serves for frictionally clamping a clutch disk element between the pressure element and the counter element, wherein the pressure element is connected by a closing spring to the counter element.

2. The clutch system as claimed in claim 1 , wherein the friction clutch at least partially covers the ramp system in a radial direction.

3. The clutch system as claimed in claim 1 , wherein the output ramp of the ramp system is connected to a pressure plate of the friction clutch, wherein the pressure plate extends in a radial direction and at least partially with a component in an axial direction, wherein the pressure plate at least partially covers the ramp system in the radial direction.

4. The clutch system as claimed in claim 1 , wherein the input ramp of the ramp system is coupled by a driver ring to a clutch disk element, which can be frictionally clamped between a pressure element and a counter element, of the pilot clutch, wherein the driver ring extends in a radial direction and at least partially with a component in an axial direction.

5. The clutch system as claimed in claim 4 , where the clutch disk element projects radially outward out of the pilot clutch, wherein the driver ring at least partially covers the pilot clutch radially at an outside thereof.

6. The clutch system as claimed in claim 1 , wherein the electromagnet is arranged radially within the friction clutch or the pilot clutch, wherein the electromagnet is designed such that it can act magnetically on a pressure element of the pilot clutch.

7. The clutch system as claimed in claim 1 , wherein, on an output side or on an input side, the friction clutch is mounted radially on an inside by a radially extending supporting disk, wherein the supporting disk has an axial inner side pointing toward the friction clutch, wherein the axial inner side points towards the ramp system or the electromagnet.

8. The clutch system as claimed in claim 7 , further comprising a fixed module carrier, wherein the supporting disk is mounted on the module carrier by a bearing, wherein the electromagnet is fastened rotationally fixedly by a supporting foot to the module carrier, wherein the bearing is supported fixedly in terms of movement in an axial direction between the module carrier and the supporting foot.

9. The clutch system as claimed in claim 1 , wherein between the electromagnet and a pressure element of the pilot clutch in an axial direction is a contact plate, which is mounted and fixed in the axial direction, for axially striking against the pressure element when there is a magnetic force acting from the electromagnet on the pressure element.

10. A clutch system for coupling a drive shaft of a motor vehicle engine to a transmission input shaft of a motor vehicle transmission, comprising:
a friction clutch configured to transmit a torque between a torque-introducing element and a torque-discharging element,
a ramp system configured to axially displace a pressure plate of the friction clutch, wherein the ramp system has an input ramp and an output ramp, the output ramp being movable in relation to the input ramp to change an axial extent of the ramp system,
a pilot clutch configured to actuate the friction clutch based on a differential speed between the torque-introducing element and the torque-discharging element, and
an electromagnet arranged for a magnetic actuation of the pilot clutch, wherein axially between the electromagnet and a pressure element of the pilot clutch, a contact plate is mounted and fixed in an axial direction for axially striking against the pressure element when there is a magnetic force acting from the electromagnet on the pressure element, and
wherein the pressure element of the pilot clutch is coupled to a counter element, which is connected to the torque-introducing element, by a closing spring, and the pilot clutch is configured to close automatically by the closing spring when no magnetic force applied by the electromagnet is acting on the pressure element.

11. The clutch system of claim 10 , wherein when the electromagnet is energized and in order to open the pilot clutch, the electromagnet is configured to attract the pressure element of the pilot clutch.

12. The clutch system of claim 10 , wherein a clutch disk element is arranged to be frictionally clamped between the pressure element of the pilot clutch and a counter element connected to the torque-introducing element for conjoint rotation to close the pilot clutch.

13. The clutch system of claim 12 , wherein the clutch disk element is coupled to a driver ring, wherein the driver ring is mounted on an input part of the friction clutch, wherein the driver ring is coupled rotationally conjointly to the input ramp of the ramp system, such that, in a closed state of the pilot clutch, the input ramp rotates with a rotational speed of the torque-introducing element.

Assignees

• Schaeffler Technologies Ag

Inventors

• Trinkenschuh Andreas

Classifications

• F16D27/108

  with axially movable clutching members · CPC title

• F16D2500/1066

  Hybrid · CPC title

• F16D27/112

  with flat friction surfaces, e.g. discs · CPC title

• F16D2023/123

  Clutch actuation by cams, ramps or ball-screw mechanisms · CPC title

• F16D21/08 Primary

  Serially-arranged clutches interconnecting two shafts only when all the clutches are engaged (F16D13/08, F16D13/12 take precedence) · CPC title