Clutch System Early Mode Switching Control
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Solution Overview
Problem
The existing selectable one-way clutch systems face challenges in efficiently switching from the lock mode to the free mode, particularly due to high operational loads and wear when releasing engagement, and require time-consuming processes to confirm overrun states before switching, leading to prolonged mode switching times.
Innovation Solution
A clutch system with a control device that executes early mode switching control by making the selector plate go into a waiting state and applying negative torque to the rotational plate, allowing the selector plate to rotate to the release position without needing to confirm overrun states, thereby reducing switching time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the selector plate is rotated to release the pawl member engagement in the lock mode, then the mode switching from lock mode to free mode is achieved, but a big load is applied to the drive device and wear occurs on components
Solution Approach 1:
The invention applies preliminary action by first rotating the rotational plate in the negative rotational direction to weaken the engagement between the pawl member and recess before rotating the selector plate. This preliminary rotation of the rotational plate reduces the engagement strength, so that when the selector plate is subsequently rotated to release the engagement, the required force is significantly reduced and component wear is minimized.
2Force
If the overrun state is confirmed before rotating the selector plate, then the load on the drive device is reduced, but the mode switching time is prolonged
Solution Approach 1:
The invention performs preliminary action by rotating the rotational plate in the negative rotational direction to weaken engagement before the selector plate rotation. This preliminary step reduces the engagement strength in advance, eliminating the need to wait for overrun state confirmation. As a result, the selector plate can be rotated immediately with reduced load, achieving both low drive device load and fast mode switching.
Solution Approach 2:
The invention skips the time-consuming overrun state confirmation process by directly rotating the rotational plate to weaken engagement and then immediately rotating the selector plate. This rushing through of the intermediate confirmation step reduces mode switching time while still ensuring low load conditions through the preliminary engagement weakening.
3Productivity
If the engagement between pawl member and recess is forcibly released, then the mode switching is achieved quickly, but component wear increases
Solution Approach 1:
The invention applies preliminary action by rotating the rotational plate in the negative rotational direction to weaken the engagement between the pawl member and recess before the selector plate rotation. This preliminary weakening of engagement reduces the force required for release, enabling quick mode switching without causing excessive component wear from forcible release.
Data Source
AI summary
A clutch system of the present invention executes, when switching a selectable one-way clutch from a lock mode to a free mode, an early mode switching control where while a selector plate is made go into a waiting state that a pawl member protruding from a fixed plate is abutting against a non-formation portion, a negative torque is made to act on a rotational plate in a negative rotational direction, and, by controlling the negative torque, the selector plate of the waiting state is made to rotate up to a release position.