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

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, the clutch body including 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 and is arranged axially between the hub body and the clutch body and which is fixed to the hub body such that the blocking ring is rotatable in relation to the sliding sleeve by a certain degree in the 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 the blocking ring includes a plurality of axially resilient tabs which are directed radially inward and which bear against the hub body and limit the movement of the blocking ring relative to the hub body in the circumferential direction, and a ring portion which is arranged radially outside of the tabs and which includes a friction surface that rests permanently against a mating friction surface on the clutch body,
• wherein the friction surface of the blocking ring is formed on a circumferentially encircling V-shaped projection on the ring portion and the mating friction surface of the clutch body is formed on a circumferentially encircling V-shaped depression, the projection and the depression engaging in one another or the friction surface on the blocking ring and the mating friction surface on the clutch body are radially oriented and planar.

A method of shifting a claw-type gearshift, the claw-type gearshift including a sliding sleeve adapted to be axially displaced on a hub body, a clutch body of a speed change gear, the clutch body being adapted to move into engagement with the sliding sleeve, and a blocking ring arranged axially between the hub body and the clutch body, a permanent frictional connection between a friction surface of the blocking ring and a mating friction surface of the clutch body being provided, comprising:

• switching over of the blocking ring in the circumferential direction to one of two locking positions by the permanent frictional connection between the friction surface of the blocking ring and the mating friction surface of the clutch body;
• 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;
• switching over of the blocking ring to the release position in the circumferential direction by a change in direction of the relative rotational speeds of the clutch body and the hub body, the blocking ring being entrained by the clutch body or the hub body into the release position;
• and
• engaging the internal toothing of the sliding sleeve with the external toothing of the clutch body.