Pressing Operation Device Linkage Backlash Suppression
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Solution Overview
Problem
Pressing operation devices in vehicles experience backlash due to vibrations, leading to abnormal noise, as the looseness in the linkage between the keytop and fixed members causes instability during operation.
Innovation Solution
A pressing operation device with a link member that includes a support-side shaft and a link-side shaft, integrated with a connection portion, is supported by a bearing with regulation portions and a spring member to maintain alignment and prevent backlash. The spring member presses the support-side shaft against the regulation portions, ensuring the link member remains stable and aligned, effectively suppressing vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If looseness is provided in the linkage between the keytop and fixed member to smoothly push down the keytop, then the ease of operation is improved, but backlash occurs due to vibration resulting in abnormal noise
Solution Approach 1:
A bearing is introduced as an intermediary component between the support-side shaft and the base. The bearing contains regulation portions that constrain the shaft's movement while allowing rotation, and a spring member that applies pressing force to eliminate backlash. This intermediary structure resolves the contradiction by providing both smooth operation and vibration suppression.
Solution Approach 2:
The physical state of the link member is changed from a rigid fixed connection to an elastic pressed connection via the spring member. The spring member dynamically adjusts the pressing force on the support-side shaft, maintaining contact pressure to eliminate backlash while allowing the necessary rotational movement for smooth operation.
2Manufacturing precision
If a link member with integrated shafts and connection portion is used to connect base and operating body, then the manufacturing precision is improved, but the device complexity increases due to the bearing structure
Solution Approach 1:
The support-side shaft, link-side shaft, and connection portion are merged into a single integrated link member. This reduces the number of separate components and simplifies manufacturing, while the bearing structure is designed to accommodate this integrated form with regulation portions that directly engage with the shaft features.
3Reliability
If the support-side shaft is rotatably supported by a bearing with regulation portions and spring member, then the reliability is improved by suppressing backlash, but the ease of manufacture decreases
Solution Approach 1:
The link member is designed with pre-formed shaft portions and connection features that are prepared in advance during manufacturing. The bearing's regulation portions are designed to align with these pre-formed features, allowing for straightforward assembly without requiring complex adjustment or fitting procedures.
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
The solution effectively suppresses backlash and vibrations, reducing abnormal noise and maintaining the stability of the pressing operation device, allowing for smoother operation and assembly.
Implementation Method 1
a spring member configured to press the support-side shaft against both the first regulation portion and the second regulation portion
Implementation Method 2
The bearing includes a first regulation portion configured to regulate movement of the support-side shaft in an ascending direction of the operating body and a second regulation portion configured to regulate movement of the support-side shaft in a direction intersecting the ascending direction
Implementation Method 3
a link member configured to link the base and the operating body together... the support-side shaft and the link-side shaft are disposed on a parallel line
Data Source
AI summary
A pressing operation device is configured such that a base and an operating body are linked to each other by a link member. A support-side shaft of the link member is rotatably supported by a bearing of the base. The bearing of the base includes a first regulation portion that regulates movement of the support-side shaft of the link member in an ascending direction of the operating body and a second regulation portion that regulates movement of the support-side shaft in a direction intersecting the ascending direction, and is provided with a flat spring portion that presses the support-side shaft against the second regulation portion and the first regulation portion.