Japan

Clutch for Parking Lock system

  • Roller ratchet clutch

This mechanism locks the rotation inside the transmission or e-Axle, so the wheels do not rotate when the shift lever of automatic and xEV vehicles is set to park.
Below, we propose a unique system using a roller ratchet clutch.

Leaflet

Clutch for Parking Lock system

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Workings

The main components consist of an inner ring, outer ring, selector, roller, and spring. The clutch roller position is controlled by the selector, which switches between the free mode and the lock mode.
Operated by a combination of an actuator and a rod, this mechanism realizes simple mode switching: free (OFF) when driving, and locked (ON) when parked.

Features

All functions specific to parking locks are integrated into a compact clutch unit

  • Lock standby mode

    A spring built into the rod also provides a lock standby mechanism to allow switching even when only patially -engaged.

  • Starting from lock mode

    The rollers between the inner and outer rings are angled so that the rollers are released when the selector is released, even under heavy load conditions on slopes, etc., for smooth switching.

  • Malfunction prevention

    The inner ring chamfer provides a safety feature that prevents sudden locking due to activation system malfunctions.

  • Low drag torque

    Due to a small gap between the inner and outer rings, the roller and inner ring are not in contact with each other when traveling, resulting in low drag torque.

  • Low backlash and secure locking when stopped

    The selector prevents roller pop-out and is not released by input from the tires.

Unitization of the Clutch Mechanism allows for a Compact Unit and a Reduction in the Number of Parts

Compact and lightweight mechanism = 25% reduction in area dedicated to the parking lock (According to our survey)

Reduction in the number of parts and assembly man-hours = 70% reduction in unit parts (According to our survey)

Up to to 25% downsizing

Reduction in processing cost of case body = 75% reduction in processing areas (According to our survey)

Thank you for your interest in TSUBAKI mobility products.
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Mobility

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