Parking Brake Lever Assembly with Non-Circular Rotation Stop
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Solution Overview
Problem
The existing parking brake lever devices with a circular cross section require a large number of assembly steps and high equipment costs, and the release knob's slant design makes it difficult to achieve correct posture alignment during assembly due to the screwing-in system, which lacks directional precision.
Innovation Solution
A parking brake lever device featuring a release rod with a non-circular cross section rotation stop part, a retaining part, and a release knob with loosely fitting parts for rotation and retention, along with a lid part that engages to secure the release rod, reducing assembly steps and costs while ensuring correct posture alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a screwing-in system is used to assemble the release knob to the release rod, then the connection is secure, but the number of assembly steps increases and equipment cost increases
Solution Approach 1:
The invention extracts the screwing mechanism from the assembly process by providing a through hole that allows the release rod to pass directly through the release knob, eliminating the need for separate screw fastening components and steps while maintaining secure connection through the engagement groove and protrusion structure
Solution Approach 2:
The invention merges the connection function with the structural design by forming the engagement groove directly in the release knob and the corresponding protrusion on the release rod, combining what were previously separate fastening components into an integrated assembly structure
2Reliability
If a screwing-in system is used to assemble the release knob to the release rod, then the connection is secure, but the equipment cost for assembling increases
Solution Approach 1:
The invention removes the requirement for specialized screwing equipment by using a direct insertion assembly method through the through hole, eliminating the need for torque screwdrivers, alignment fixtures, and other expensive assembling equipment while maintaining secure connection
Solution Approach 2:
The engagement groove and protrusion structure are designed to self-align and self-lock during assembly, eliminating the need for complex positioning equipment and specialized assembly tools, thereby reducing equipment cost
3Reliability
If a screwing-in system is used to assemble the release knob to the release rod, then the connection is secure, but the positioning in rotation direction cannot be performed
Solution Approach 1:
The invention uses asymmetric engagement groove and protrusion shapes that provide inherent directional guidance, allowing the release knob to be positioned at the correct rotation angle during assembly through the geometric constraints of the engagement features rather than requiring separate positioning mechanisms
4Ease of operation
If a slant knob is used for the release knob, then the aesthetic and ergonomic requirements are met, but the directivity of the release knob cannot be handled in assembling
Solution Approach 1:
The asymmetric engagement groove and protrusion features work in conjunction with the slant knob geometry to provide inherent alignment during assembly, ensuring that the slant knob is positioned at the correct angle relative to the release rod through the geometric constraints of the engagement features
Data Source
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AI summary
Provided is a parking brake lever device which is able to reduce the number of assembled steps and an equipment cost for assembling a release rod having a circular cross section and a release knob, and assembling what is called a slant knob to the release rod having the circular cross section in a correct posture. The parking brake lever device is provided with: a release rod 35 including a circular cross section; a rotation stop part 35Y including a non-circular cross section and formed in a part of the release rod 35; a retaining part 35X that is provided to the release rod 35 so as to project in a radial direction of the release rod 35; a slant knob member 32 to which a front end part of the release rod 35 is attached; a loosely fitting part for rotation stop 32Y provided in the slant knob member 32 and loosely fitting the rotation stop part 35Y of the release rod 35; and a loosely fitting part for retention 32X provided in the slant knob member 32 and loosely fitting the retaining part 35X of the release rod 35.