Radially applied dog clutch with bi-directional ratcheting for a vehicle transmission

Patent metadata

Field	Value
Publication number	US-10138947-B2
Application number	US-201715434526-A
Country	US
Kind code	B2
Filing date	Feb 16, 2017
Priority date	Feb 16, 2017
Publication date	Nov 27, 2018
Grant date	Nov 27, 2018

Abstract

A dog clutch for a vehicle transmission includes a driving member configured to rotate about an axis and including a cavity extending radially from the axis, a driving tooth slidably movable within the radially extending cavity, a driven member coaxially surrounding the driving member and including a radially inward extending driven tooth axially aligned with the driving tooth, an actuator shaft coaxially positioned within the driving member and movable along the axis, a retainer on the actuator shaft, a bullet actuator coaxially mounted on the actuator shaft, and a biasing member coaxially mounted on the actuator shaft and positioned between the bullet actuator and the retainer.

First claim

What is claimed is:

1. A dog clutch for a vehicle transmission, the clutch comprising:
a driving member configured to rotate about an axis and including a cavity extending radially from the axis;
a driving tooth slidably movable within the radially extending cavity;
a driven member coaxially surrounding the driving member and including a radially inward extending driven tooth axially aligned with the driving tooth;
an actuator shaft coaxially positioned within the driving member and movable along the axis;
a retainer on the actuator shaft;
a bullet actuator coaxially mounted on the actuator shaft; and
a biasing member coaxially mounted on the actuator shaft and positioned between the bullet actuator and the retainer.

2. The clutch of claim 1 , wherein the actuator shaft comprises a swaged end.

3. The clutch of claim 2 , wherein the bullet actuator is positioned between the swaged end and the biasing member.

4. The clutch of claim 1 , wherein the bullet actuator comprises an engagement landing and a disengagement landing axially adjacent to the engagement landing.

5. The clutch of claim 4 , wherein the engagement landing is radially inwardly sloping toward the disengagement landing.

6. The clutch of claim 4 , wherein the engagement landing is radially inwardly sloping away from the biasing member.

7. The clutch of claim 4 , wherein the biasing member axially biases the bullet actuator on the actuator shaft in an axial direction toward an engagement axial position providing contact between the driving tooth and the engagement landing such that the driving tooth engages the driven tooth and away from a disengagement axial position providing contact between the driving tooth and the disengagement landing such that the driving tooth does not engage the driven tooth.

8. The clutch of claim 4 , wherein the bullet actuator further comprises a ramp surface between the engagement landing and the disengagement landing.

9. The clutch of claim 1 , wherein the biasing member comprises a helical coil spring coaxially surrounding the actuator shaft.

10. The clutch of claim 1 , wherein the actuator shaft comprises a retaining groove and wherein the retainer is positioned within the retaining groove.

11. A dog clutch for a vehicle transmission, the clutch comprising:
a driving member configured to rotate about an axis and including a first cavity extending radially from the axis and a second cavity extending radially from the axis;
a first driving tooth slidably movable within the first radially extending cavity;
a second driving tooth slidably movable within the second radially extending cavity;
a first driven member coaxially surrounding the driving member and including a first radially inward extending driven tooth axially aligned with the first driving tooth;
a second driven member coaxially surrounding the driving member and including a second radially inward extending driven tooth axially aligned with the second driving tooth;
an actuator shaft coaxially positioned within the driving member and including a swaged end and movable along the axis;
a retainer on the actuator shaft;
a bullet actuator coaxially mounted on the actuator shaft and including a radially inward extending projection;
a first biasing member coaxially mounted on the actuator shaft and axially positioned between the radially inward extending projection and the retainer; and
a second biasing member coaxially mounted on the actuator shaft and axially positioned between the radially inward extending projection and the swaged end.

12. The clutch of claim 11 , wherein the bullet actuator further comprises a first disengagement landing, a second disengagement landing and an engagement landing axially positioned between the first disengagement landing and the second disengagement landing.

13. The clutch of claim 12 , wherein the engagement landing radially slopes inwardly to the first disengagement landing and the second disengagement landing.

14. The clutch of claim 12 , wherein the bullet actuator further comprises a first ramp surface between the first disengagement landing and the engagement landing and a second ramp surface between the second disengagement landing and the engagement landing.

15. The clutch of claim 11 , wherein one of the first biasing member and the second biasing member comprises a helical coil spring coaxially surrounding the actuator shaft.

16. A dog clutch for a vehicle transmission, the clutch comprising:
a driving member configured to rotate about an axis and including a first cavity extending radially from the axis and a second cavity extending radially from the axis;
a first driving tooth slidably movable within the first radially extending cavity;
a second driving tooth slidably movable within the second radially extending cavity;
a first driven member coaxially surrounding the driving member and including a first radially inward extending driven tooth that is axially aligned with the first driving tooth;
a second driven member coaxially surrounding the driving member and including a second radially inward extending driven tooth that is axially aligned with the second driving tooth;
an actuator shaft coaxially positioned within the driving member and including a swaged end and movable along the axis;
a first bullet actuator coaxially mounted on the actuator shaft and positioned adjacent to the swaged end;
a first biasing member coaxially mounted on the actuator shaft and axially positioned adjacent to the first bullet actuator;
a first retainer on the actuator shaft axially positioned adjacent to the first biasing member;
a second biasing member coaxially mounted on the actuator shaft and axially positioned adjacent to the first retainer;
a second bullet actuator coaxially mounted on the actuator shaft and axially positioned adjacent to the second biasing member;
a third biasing member coaxially mounted on the actuator shaft and axially positioned adjacent to the second bullet actuator; and
a second retainer on the actuator shaft and axially positioned adjacent to the third biasing member.

17. The clutch of claim 16 , wherein one of the first bullet actuator and the second bullet actuator comprises a first engagement landing, a second engagement landing and a disengagement landing axially positioned between the first disengagement landing and the second disengagement landing.

18. The clutch of claim 17 , wherein one of the first engagement landing and the second engagement landing radially slopes inwardly to the disengagement landing.

19. The clutch of claim 17 , wherein the one of the first bullet actuator and the second bullet actuator further comprises a first ramp surface between the first engagement landing and the disengagement landing and a second ramp surface between the second engagement landing and the disengagement landing.

20. The clutch of claim 16 , wherein one of the first biasing member, second biasing member, and third biasing member comprises a helical coil spring coaxially surrounding the actuator shaft.

Assignees

• Gm Global Tech Operations Llc

Inventors

• Littlefield Joseph R
• Boyd Jonathan

Classifications

• F16D2023/0618

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

• F16D11/16 Primary

  with clutching members movable otherwise than only axially (F16D11/02, F16D11/08 take precedence) · CPC title

• F16D2023/123

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

• F16D23/06

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

• F16D23/12

  Mechanical clutch-actuating mechanisms arranged outside the clutch as such (specific for combined clutches F16D21/00; mechanisms specific for synchronisation F16D23/02) · CPC title