Interlocking Gearshift Unit with Elastic Engagement Elements
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Solution Overview
Problem
Existing interlocking gearshift units in motor vehicle drive trains face challenges in enhancing shifting comfort and reducing drag losses while avoiding vibrations and shocks during gear shifting, particularly in edge-to-edge contact scenarios.
Innovation Solution
The design incorporates a first clutch half with a multiplicity of blocking teeth and a second clutch half with fang teeth, allowing for a smooth connection under differential speed, along with a damping unit that enables elastic movement, preventing backlash play and noise, and ensuring reliable torque transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If engagement elements are arranged to move in circumferential direction, then shifting comfort is improved by preventing contact breakage and grating, but device complexity increases due to additional movement degrees
Solution Approach 1:
The engagement elements are designed to move dynamically in the circumferential direction during the meshing operation. This dynamic capability allows the teeth to adjust their contact point and avoid edge-to-edge contact, thereby preventing grating and improving shifting comfort while managing the complexity through controlled movement.
Solution Approach 2:
The circumferential movement capability is prepared in advance to cushion the meshing operation. When differential speed causes potential edge-to-edge contact, the engagement elements can ease off along the circumference beforehand, reducing impact and preventing contact breakage, thus improving shifting comfort.
2Object-affected harmful factors
If engagement elements allow circumferential movement, then vibrations and shocks are reduced, but manufacturing precision requirements increase
Solution Approach 1:
The dynamic circumferential movement of engagement elements allows the system to absorb and distribute vibrations and shocks during meshing. By enabling the teeth to adjust their position, the design reduces harmful vibrations and shocks while maintaining feasible manufacturing precision through the self-adjusting mechanism.
3Reliability
If edge-to-edge contact is prevented through circumferential movement, then torque transmission reliability is improved, but drag losses in open state increase
Solution Approach 1:
The engagement elements move circumferentially only during the meshing operation to ensure proper tooth engagement and prevent edge-to-edge contact. This dynamic adjustment improves torque transmission reliability during shifting while the mechanism is designed to minimize drag losses when the gearshift unit is in the open running state.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enhances shifting comfort by preventing contact breakage and grating, reducing vibrations and noise, and providing low-loss torque transmission, thus improving the overall performance of the gearshift unit without additional electronics.
Implementation Method 1
a damping unit (24a, 24b, 24c, 24d) is provided, which locates the second engagement element (14a, 14b, 14c, 14d) so that it can move elastically
Implementation Method 2
preventing contact breakage and grating, reducing vibrations and noise
Data Source
AI summary
An interlocking gearshift unit for a motor vehicle drive train has a first clutch half and a second clutch half which are arranged so that they can slide relative to one another along an actuating direction in order to produce a connection with a fixed rotational relationship. At least the first clutch half has at least one first engagement element and a second engagement element, which can move with respect to the first engagement element. The first and second engagement elements are arranged so that they can move with respect to one another in a circumferential direction.