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

Patent metadata

Field	Value
Publication number	US-12012999-B2
Application number	US-202218050204-A
Country	US
Kind code	B2
Filing date	Oct 27, 2022
Priority date	Oct 28, 2021
Publication date	Jun 18, 2024
Grant date	Jun 18, 2024

Abstract

In a claw-type gearshift, a blocking ring is arranged axially between a hub body having a sliding sleeve and a clutch body such that it is rotatable between a release position and two locking positions. The blocking ring is adapted to be displaced toward the clutch body until conical friction surfaces on the blocking ring and on the clutch body come into contact. The blocking ring constitutes a form-locking blockade for the sliding sleeve against displacement of the sliding sleeve teeth between the clutch body teeth when an axial shifting force is applied in the non-synchronized state. When the claw clutch is shifted, a difference in speed between the clutch body and the hub body is reduced and the sliding sleeve is deflected in the axial direction toward the speed change gear to be shifted, as a result of which a friction surface of the blocking ring and a mating friction surface of the clutch body come into contact.

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 in the internal toothing of the sliding sleeve, and
a blocking ring which has an external toothing having a multitude of blocking ring teeth and is arranged axially between the hub body and the clutch body and which is fixed to the hub body such that it is rotatable in relation to the sliding sleeve by a certain degree in a circumferential direction between a release position and two locking positions, the locking positions being located on either side of the release position in the circumferential direction,
wherein arranged on the hub body are a plurality of thrust pieces which are movable toward the clutch body, and the blocking ring is adapted to be displaced by the thrust pieces toward the clutch body until a friction surface of the blocking ring comes to rest against a mating friction surface of the clutch body,
wherein the friction surface on the blocking ring and the mating friction surface on the clutch body have a conical shape, and
wherein the blocking ring constitutes a form-locking blockade for the sliding sleeve against a displacement of the sliding sleeve teeth between the clutch body teeth when an axial shifting force is applied in a non-synchronized state, and
wherein the blocking ring teeth and the sliding sleeve teeth are formed such and located opposite each other in the locking position such that when the axial shifting force is applied, the sliding sleeve cannot return the blocking ring to the release position.

2. The claw-type gearshift according to claim 1 , wherein the tooth centers of the blocking ring teeth and the sliding sleeve teeth are opposite each other in each of the locking positions as viewed in an axial direction.

3. The claw-type gearshift according to claim 1 , wherein axial ends of the blocking ring teeth and/or the sliding sleeve teeth are either made to be axially flat or to have axial pointing surfaces that have an opening angle perpendicular to a tooth longitudinal direction that is equal to or smaller than 7 degrees, wherein the opening angle lying in a range of a respective self-locking angle of a material pairing is between the blocking ring and the sliding sleeve.

4. The claw-type gearshift according to claim 1 , wherein the sliding sleeve teeth and the clutch body teeth are formed without engagement slopes.

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

6. A method of shifting a claw-type gearshift having a sliding sleeve adapted to be axially displaced on a hub body, a clutch body of a speed change gear, which is adapted to move into engagement with the sliding sleeve, and a blocking ring arranged axially between the hub body and the clutch body, the blocking ring having an external toothing with blocking ring teeth and the sliding sleeve having an internal toothing with a multitude of sliding sleeve teeth, the method comprising:
firstly, reducing a difference in speed between the clutch body and the hub body;
secondly, applying an axial shifting force and deflecting the sliding sleeve in the axial direction toward the speed change gear to be shifted, as a result of which a friction surface of the blocking ring and a mating friction surface of the clutch body come into contact;
switching the blocking ring over in a circumferential direction to one of two possible locking positions by the frictional connection with the clutch body, so that a further axial movement of the sliding sleeve is blocked by the external toothing of the blocking ring;
switching the blocking ring over in the circumferential direction to a release position when a change in direction of the relative rotational speeds of the clutch body and the hub body occurs, wherein the blocking ring teeth and the sliding sleeve teeth are formed such and located opposite each other in the locking position such that when the axial shifting force is applied, the sliding sleeve cannot return the blocking ring to the release position; and
engaging the internal toothing of the sliding sleeve with an external toothing of the clutch body.

7. The method according to claim 6 , wherein the blocking ring blocks an axial further movement of the sliding sleeve irrespective of the shifting force acting.

8. The method according to claim 6 , wherein a relative rotation between the hub body and the clutch body, which allows the internal toothing of the sliding sleeve to engage with the external toothing of the clutch body, is achieved by a speed difference between the hub body and the clutch body that builds up after the change in direction of the relative rotational speeds of the clutch body and the hub body occurs.

9. The method according to claim 6 , wherein the adaption of the speeds of the hub body and the clutch body is effected by a device that is separate from the blocking ring and thrust pieces arranged on the hub body.

10. The method according to claim 6 , wherein the friction surface of the blocking ring is conical and widens radially when the blocking ring is axially acted upon by the sliding sleeve and the conical friction surface comes into contact with the clutch body, and wherein the blocking ring relaxes and springs back to its axial neutral position when it rotates back to its release position, with the blocking ring teeth moving between the sliding sleeve teeth.

11. The method according to claim 6 , wherein
the external toothing of the blocking ring is arranged axially between the hub body and the clutch body, the locking positions being located on either side of the release position in the circumferential direction,
wherein arranged on the hub body are a plurality of thrust pieces which are movable toward the clutch body, and the blocking ring is adapted to be displaced by the thrust pieces toward the clutch body until the friction surface of the blocking ring comes to rest against the mating friction surface of the clutch body,
wherein the friction surface on the blocking ring and the mating friction surface on the clutch body have a conical shape, and
wherein the blocking ring constitutes a form-locking blockade for the sliding sleeve against a displacement of the sliding sleeve teeth between the clutch body teeth when the axial shifting force is applied in a non-synchronized state.

12. A method of shifting a claw-type gearshift having a sliding sleeve adapted to be axially displaced on a hub body, a clutch body of a speed change gear, which is adapted to move into engagement with the sliding sleeve, and a blocking ring arranged axially between the hub body and the clutch body, the method comprising:
reducing a difference in speed between the clutch body and the hub body;
applying an axial shifting force and deflecting the sliding sleeve in the axial direction toward the speed change gear to be shifted, as a result of which a friction surface of the blocking ring and a mating friction surface of the clutch body come into contact;
switching the blocking ring over in a circumferential direction to one of two possible locking positions by the frictional connection with the clutch body, so that a further axial movement of the sliding sleeve is blocked by an external toothing of the blocking ring;
switching the blocking ring over in the circumferential direction to a release position when a change in direction of the relative rotational spe

Assignees

• Hoerbiger Antriebstechnik Hold

Inventors

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

Classifications

• F16D2023/0656

  Details of the tooth structure; Arrangements of teeth · CPC title

• F16D2023/0618

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

• F16D2023/0631

  Sliding sleeves; Details thereof · CPC title

• F16D2023/0625

  Details of members being coupled, e.g. gears · CPC title

• F16D2011/002

  using an external and axially slidable sleeve for coupling the teeth of both coupling components together · CPC title