Claw-type gearshift and method of shifting a claw-type gearshift

Patent metadata

Field	Value
Publication number	US-12264740-B2
Application number	US-202218050201-A
Country	US
Kind code	B2
Filing date	Oct 27, 2022
Priority date	Oct 28, 2021
Publication date	Apr 1, 2025
Grant date	Apr 1, 2025

Abstract

A claw-type gearshift has a sliding sleeve which is adapted to be axially displaced on a hub body and a clutch body of a speed change gear. The hub body has at least one thrust piece arranged thereon which includes a friction surface that cooperates with a mating friction surface on the clutch body, the at least one thrust piece being displaceable in the circumferential direction between a release position and two locking positions that are located on either side of the release position. A first locking structure on the at least one thrust piece cooperates with a second locking structure on the internal toothing of the sliding sleeve. The locking structures are configured such that in each of the locking positions, the locking structures rest against each other such that a further axial movement of the sliding sleeve is blocked. For shifting a gear, a difference in speed between the clutch body and the hub body is reduced.

First claim

The invention claimed is:

1. A claw-type gearshift, comprising:
a sliding sleeve which is adapted to be axially displaced on a hub body and includes an internal toothing having a multitude of sliding sleeve teeth, and a clutch body of a speed change gear, which includes an external toothing which has a multitude of clutch body teeth and is adapted to engage with the internal toothing of the sliding sleeve,
wherein arranged at the hub body is at least one thrust piece which is coupled to the sliding sleeve and includes a friction surface that cooperates with a mating friction surface on the clutch body,
wherein the at least one thrust piece is displaceable in relation to the hub body in a circumferential direction by a certain degree between a release position and two locking positions, the two locking positions being located on either side of the release position in the circumferential direction, and
wherein the at least one thrust piece includes a first locking structure which cooperates with a second locking structure on the internal toothing of the sliding sleeve, and the locking structures are configured such that in each of the two locking positions, the locking structures rest against each other such that a further axial movement of the sliding sleeve is blocked.

2. The claw-type gearshift according to claim 1 , wherein the first locking structure on the at least one thrust piece includes two axially limited and oppositely oriented recesses that are open in the circumferential direction, and the second locking structure on the internal toothing of the sliding sleeve is formed by radial tooth extensions, wherein in each of the two locking positions a respective tooth extension engages in one of the recesses.

3. The claw-type gearshift according to claim 2 , wherein the tooth extensions are provided to limit a shifting travel toward the clutch body.

4. The claw-type gearshift according to claim 1 , wherein the at least one thrust piece is received in a retainer in the hub body, the retainer being made so large that the retainer allows a displacement of the at least one thrust piece in the circumferential direction into both locking positions.

5. The claw-type gearshift according to claim 1 , wherein the friction surface is formed on a lower surface of the at least one thrust piece and the mating friction surface is formed on a conical surface of the clutch body.

6. The claw-type gearshift according to claim 1 , wherein the claw-type gearshift is for a manual transmission.

7. A method of shifting a claw-type gearshift having a sliding sleeve which is adapted to be axially displaced on a hub body and a clutch body of a speed change gear, which is adapted to move into engagement with the sliding sleeve, wherein arranged on the hub body is at least one thrust piece which is adapted to be deflected axially and in a circumferential direction and which includes a friction surface adapted to come into contact with a mating friction surface on the clutch body, the method comprising:
reducing a difference in speed between the clutch body and the hub body;
applying a shifting force and deflecting the sliding sleeve in the axial direction toward the speed change gear to be shifted, causing the at least one thrust piece to be deflected axially and the friction surface of the at least one thrust piece to come into contact with the mating friction surface of the clutch body;
displacing the at least one thrust piece in the circumferential direction to one of the two locking positions by the frictional connection with the clutch body, wherein a further axial movement of the sliding sleeve is prevented by engagement of a first locking structure on the at least one thrust piece with a second locking structure on the sliding sleeve;
returning the at least one thrust piece to the release position in the circumferential direction by the frictional connection when a change in direction of the relative rotational speed of the clutch body and the hub body takes place; and
engaging the internal toothing of the sliding sleeve with the external toothing of the clutch body.

8. The method according to claim 7 , wherein the at least one thrust piece blocks an axial further movement of the sliding sleeve irrespective of the acting shift force, and a relative rotation between the hub body and the clutch body, which allows the internal toothing of the sliding sleeve to engage in the external toothing of the clutch body, is achieved by a speed difference between the sliding sleeve and the clutch body that builds up after the rotational speed crossing.

9. The method according to claim 7 , wherein a locking block of the at least one thrust piece is displaced radially inwards when, in the release position, the sliding sleeve is engaged in the clutch body.

10. The method according to claim 7 , wherein the adaption of the speeds of the hub body and the clutch body is effected by a device separate from the at least one thrust piece.

11. The method according to claim 7 , wherein the internal toothing of the sliding sleeve has a multitude of sliding sleeve teeth, and the external toothing of the clutch body has a multitude of clutch body teeth,
wherein arranged at the hub body is at least one thrust piece which is coupled to the sliding sleeve and includes a friction surface that cooperates with a mating friction surface on the clutch body,
wherein the at least one thrust piece is displaceable in relation to the hub body in the circumferential direction by a certain degree between a release position and two locking positions, the locking positions being located on either side of the release position in the circumferential direction, and
wherein the at least one thrust piece includes a first locking structure which cooperates with a second locking structure on the internal toothing of the sliding sleeve, and the locking structures are configured such that in each of the locking positions, the locking structures rest against each other such that a further axial movement of the sliding sleeve is blocked.

Assignees

• Hoerbiger Antriebstechnik Hold

Inventors

• Binder Juergen
• Fuerguth Werner
• Dempfle Andreas
• Voelk Wolfgang
• Schnelzer Thomas
• Echtler Peter

Classifications

• F16H63/04

  a single final output mechanism being moved by a single final actuating mechanism · CPC title

• F16H61/0403

  Synchronisation before shifting · CPC title

• F16H2063/3093

  Final output elements, i.e. the final elements to establish gear ratio, e.g. coupling sleeves or other means establishing coupling to shaft · CPC title

• F16D2023/0631

  Sliding sleeves; Details thereof · CPC title

• F16D23/06 Primary

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