Dual actuation ball contour synchronizing clutch

Patent metadata

Field	Value
Publication number	US-9746038-B2
Application number	US-201514922654-A
Country	US
Kind code	B2
Filing date	Oct 26, 2015
Priority date	Oct 26, 2015
Publication date	Aug 29, 2017
Grant date	Aug 29, 2017

Abstract

A dual actuation synchronizing clutch assembly including an improved synchronization arrangement is provided. The dual actuation synchronizing clutch assembly has a plurality of operational phases, including initial, synchronization, positioning, engagement, and running phases that vary the torque flow path between the input shaft and output shaft. A synchronizing assembly is provided that includes a synchronizer ring having a first friction surface and synchronizer teeth. A connecting gear includes a lock-up assembly with retractable elements and connecting gear teeth. An output gear includes a second friction surface configured to frictionally engage the first friction surface of the synchronizer ring, and a contoured receiving path with positioning points configured to receive the retractable elements of the lock-up assembly.

First claim

What is claimed is:

1. A dual actuation synchronizing clutch assembly comprising:
an input shaft;
a rotatably supported output shaft axially aligned with the input shaft;
a connecting gear including a lock-up assembly with retractable elements, connecting gear teeth, and the connecting gear is connected to the input shaft;
a first actuator configured to engage a first actuator loading bearing axially against the connecting gear;
a synchronizer ring including a first friction surface and synchronizer teeth;
an output gear fixed to the output shaft, the output gear including a second friction surface configured to frictionally engage the first friction surface of the synchronizer ring, a contoured receiving path with positioning points configured to receive the retractable elements of the lock-up assembly, and output gear teeth;
a shifter sleeve including shifter sleeve teeth that mesh with the connecting gear teeth and the synchronizer teeth, and the shifter sleeve teeth are configured to mesh with the output gear teeth;
a second actuator configured to engage a second actuator loading bearing axially against the shifter sleeve;
a first spring arranged between the synchronizer ring and the output gear, a second spring arranged between the connecting gear and the synchronizer ring, and a third spring that biases the shifter sleeve to a disengaged position;
the dual actuation synchronizing clutch assembly having a plurality of operational phases, the plurality of operational phases including:
(1) an initial phase in which the first and second actuators are deactivated, and the first, second, and third springs are in an expanded state such that the input shaft and the output shaft are rotatable independently from each other;
(2) a synchronization phase in which the first actuator is in a first actuation mode, the first spring and the second spring are at least partially compressed, and the first friction surface of the synchronizer ring engages the second friction surface of the output gear, and a torque flow path is provided between the input shaft and the output shaft via the first and second friction surfaces of the synchronizer ring and the output gear;
(3) a positioning phase in which the first actuator is in a second actuation mode, and at least the second spring is further compressed than in the synchronization phase, the retractable elements of the lock-up assembly engage in the positioning points of the contoured receiving path of the output gear and the first friction surface of the synchronizer ring remains engaged with the second friction surface of the output gear, such that the torque flow path is at least partially provided between the input shaft and the output shaft via the lock-up assembly of the connecting gear engaging the output gear, and the shifter sleeve teeth are aligned with the output gear teeth;
(4) an engagement phase in which the first actuator is in the second actuation mode and the second actuator is actuated, the third spring is at least partially compressed, the retractable elements of the lock-up assembly remain engaged in the positioning points of the contoured receiving path of the output gear, and the output gear teeth engage the shifter sleeve teeth, such that the torque flow path is provided between the input shaft and the output shaft via the output gear teeth and the shifter sleeve teeth; and
(5) a running phase in which the first actuator is deactivated and the second actuator remains actuated, the first spring and the second spring return to an expanded state and the third spring remains at least partially compressed, the first friction surface of the synchronizer ring is disengaged from the second friction surface of the output gear, the retractable elements of the lock-up assembly is disengaged from the positioning points of the contoured receiving path of the output gear, and the output gear teeth remain engaged with the shifter sleeve teeth, such that the torque flow path is provided between the input shaft and the output shaft via the output gear teeth and the shifter sleeve teeth.

2. The dual action synchronizing clutch assembly of claim 1 , wherein the input shaft includes input shaft splines.

3. The dual action synchronizing clutch assembly of claim 2 , wherein the connecting gear includes connecting gear splines meshed with the input shaft splines.

4. The dual action synchronizing clutch assembly of claim 1 , wherein the output shaft includes output shaft splines that mesh with output gear splines.

5. The dual action synchronizing clutch assembly of claim 1 , wherein the first friction surface of the synchronizer ring and the second friction surface of the output gear each have a frusto-conical profile.

6. The dual action synchronizing clutch assembly of claim 1 , wherein the output gear teeth are arranged on a radially outer surface of the output gear, and the shifter sleeve teeth are arranged on a radially inner surface of the shifter sleeve.

7. The dual action synchronizing clutch assembly of claim 1 , wherein the synchronizer ring includes synchronizer splines that mesh with the input shaft splines.

8. The dual action synchronizing clutch assembly of claim 1 , wherein the lock-up assembly includes a plurality of cups each having a ball, and the positioning points of the contoured receiving path of the output gear include pockets to receive the balls.

9. The dual action synchronizing clutch assembly of claim 1 , wherein at least one shaft seal is provided between the input shaft and an input housing.

10. The dual action synchronizing clutch assembly of claim 1 , wherein a shaft support bearing is provided between the input shaft and the output shaft.

11. The dual action synchronizing clutch assembly of claim 1 , wherein a snap ring engages the input shaft and axially positions the connecting gear on the input shaft.

12. The dual action synchronizing clutch assembly of claim 1 , wherein a thrust washer and a thrust bearing is provided between the synchronizer ring and the output shaft and the output gear.

13. A synchronizing assembly for a clutch, the synchronizing assembly comprising:
a synchronizer ring including a first friction surface and synchronizer teeth;
a connecting gear including a lock-up assembly with retractable elements, and connecting gear teeth; and
an output gear including a second friction surface configured to frictionally engage the first friction surface of the synchronizer ring, and a contoured receiving path with positioning points configured to receive the retractable elements of the lock-up assembly.

14. The synchronizing assembly of claim 13 , wherein the contoured receiving path is formed as an annular groove.

15. The synchronizing assembly of claim 13 , wherein the positioning points include pockets configured to receive the retractable elements.

16. The synchronizing assembly of claim 13 , wherein the synchronizer ring includes synchronizer teeth, and the output gear includes synchronizer teeth configured to mesh with the synchronizer teeth.

17. The synchronizing assembly of claim 13 , wherein a first spring is arranged between the synchronizer ring and the output gear, and a second spring is arranged between the connecting gear and the synchronizer ring.

18. The synchronizing assembly of claim 13 , wherein the first friction surface of the synchronizer ring and the second friction surface of the output gear each have a frusto-conical profile.

Assignees

• Schaeffler Technologies Ag

Inventors

• Zhong Guihui
• Ince Marion Jack

Classifications

• F16D2023/0681

  Double cone synchromesh clutches · CPC title

• F16D2023/0618

  Details of blocking mechanism comprising a helical spring loaded element, e.g. ball · CPC title

• F16D23/025 Primary

  Synchro rings · CPC title

• F16D23/06

  and a blocking mechanism preventing the engagement of the main clutch prior to synchronisation · CPC title

• F16D2023/0693

  Clutches with hydraulic actuation · CPC title