Parking Lock Cam Guide Rotation Restriction
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Solution Overview
Problem
Existing parking lock devices face challenges in effectively restricting the rotation of the cam guide with respect to the sleeve, requiring precise design of end surfaces and tapered portions for surface contact, which can be complex and difficult to manufacture.
Innovation Solution
A cam guiding device with a cylindrical portion, partially cylindrical portion, partially tapered portion, and rotation stopper portion, where the rotation stopper protrudes radially and the sleeve has an arc portion overlapping the partially cylindrical portion, restricting rotation by abutting the sleeve and inner cam guide surface, eliminating the need for surface contact with the tapered portion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the end surface and partially tapered portion are designed for surface contact to restrict rotation, then rotation restriction is achieved, but manufacturing precision requirements increase and device complexity increases
Solution Approach 1:
The cam guide is segmented into distinct functional portions: a cylindrical portion for radial movement guidance, a partially tapered portion for axial movement guidance, and a rotation stopper portion for rotation restriction. The rotation stopper portion includes a rotation stopper that protrudes radially outward to contact the sleeve, separating the rotation restriction function from the surface contact requirement. This segmentation allows each portion to be manufactured with appropriate precision for its specific function, reducing overall manufacturing precision requirements.
Solution Approach 2:
The rotation stopper acts as an intermediary element between the cam guide and the sleeve. Instead of requiring direct surface contact between the end surface and tapered portion, the rotation stopper protrudes radially outward to contact the sleeve, mediating the rotation restriction function. This intermediary approach simplifies the contact geometry and reduces manufacturing precision requirements while maintaining reliable rotation restriction.
2Reliability
If the end surface and partially tapered portion are designed for surface contact to restrict rotation, then rotation restriction is achieved, but device complexity increases
Solution Approach 1:
The cam guide is divided into functionally distinct portions: a cylindrical portion for radial guidance, a partially tapered portion for axial guidance, and a rotation stopper portion with a protruding rotation stopper for rotation restriction. This segmentation clarifies the function of each portion and simplifies the overall design by assigning specific functions to specific geometric features, reducing design complexity.
Solution Approach 2:
Different portions of the cam guide have different local geometries optimized for their specific functions: the cylindrical portion provides radial guidance, the partially tapered portion provides axial guidance, and the rotation stopper portion with its radially protruding stopper provides rotation restriction. This local quality approach simplifies the overall design by making each local region's geometry directly correspond to its function, rather than requiring complex integrated surface contacts.
Data Source
AI summary
A cam guiding device includes a cam guide having a cylindrical portion, a partially cylindrical portion extending from a leading end portion of the cylindrical portion, a partially tapered portion extending from the leading end portion of the cylindrical portion, and a rotation stopper portion provided on the partially cylindrical portion, and a sleeve for accommodating the cam guide. The sleeve includes an arc portion that overlaps the partially cylindrical portion from an outside. A radius of the partially tapered portion increases as the partially tapered portion extends away from the cylindrical portion. The rotation stopper portion is a component that protrudes radially outward from an outer circumferential surface of the partially cylindrical portion. When the rotation stopper portion abuts the sleeve and an inner circumferential surface of the cam guide abuts the parking cam, rotation of the cam guide with respect to the sleeve is restricted.