shift actuator

CN122122405APending Publication Date: 2026-05-29KONGSBERG AUTOMOTIVE WUXI LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
KONGSBERG AUTOMOTIVE WUXI LTD
Filing Date
2023-10-24
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

Existing shift actuators are prone to gear skipping under strong vibration or mechanical shock, and require high bias pressure for smooth shifting when the shift fork is blocked, resulting in increased wear and energy consumption.

Method used

By introducing a sensor into the shift actuator to detect the position of the shift fork, and controlling the electric motor to rotate the cam by a predetermined angle after it reaches the shift position, the cam stop is opposed to the fixed stop, blocking the linear displacement of the cam against the spring bias, thereby locking the shift fork in the shift position.

Benefits of technology

It effectively prevents gear skipping, reduces wear and noise during gear shifting, lowers energy consumption, and ensures smooth operation of the shift fork even when obstructed.

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  • Figure CN122122405A_ABST
    Figure CN122122405A_ABST
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Abstract

This invention relates to a shift actuator, comprising: a support (2); a rotating member (4) mounted to rotate about a rotation axis relative to the support (2); an electric motor for rotating the rotating member; a shift fork (30) mounted to pivot about a pivot axis (22) parallel to the rotation axis; a cam (10) having a cam protrusion (12) including a apex (14) and connected to rotate with the rotating member (4), but freely displaceable in a linear direction defined by a line perpendicular to the rotation axis to overcome the bias of a spring (40) to move the cam protrusion apex (14) closer to the rotation axis, the spring (40) biasing the cam protrusion apex (14) away from the rotation axis to an extended position; and a cam follower (38) disposed on the shift fork (30) and configured to engage with the cam protrusion (12) such that... When the cam protrusion applies force on the cam follower (38), the resultant force causes the shift fork (30) to pivot from the neutral position to the shift position; the control unit (50) is configured to control the electric motor; characterized in that the sensor (60) is connected to the control unit (50) and configured to detect when the shift fork (30) has reached the shift position, the cam (10) is provided with a protruding cam stop (20), and the control unit (50) is configured to, upon receiving a sensor signal indicating that the shift fork (30) has reached the shift position, control the electric motor (4) to rotate the cam (10) by another predetermined angle so that the cam (10) moves to the blocking position, in which the cam stop (20) is juxtaposed with a fixed stop (8) fixed relative to the support (2) to block the linear displacement of the cam (10) against the bias of the spring.
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Citation Information

Patent Citations

  • Actuator system

    WO2022219394A1