Friction Engagement Assembly for Groove-Cooled Shock Absorption
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Solution Overview
Problem
Existing friction engagement devices with radial grooves on the piston's pressing surface face challenges in effectively absorbing engagement shocks, as the elastic member's deformation is hindered by the groove's shape and size, potentially preventing the desired shock absorption effect.
Innovation Solution
Incorporating an elastic member with an annular plate portion featuring alternate projections and recesses, and designing the engagement portions such that the piston and elastic member are unable to engage at a specific phase, allowing for enhanced elastic deformation and shock absorption by positioning the radial grooves and projections correspondingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the piston's pressing surface is provided with radial grooves to allow oil flow, then cooling efficiency is improved, but engagement shock absorption is worsened due to interference with the elastic member's deformation
Solution Approach 1:
The invention introduces a circumferential dimension to the solution by providing multiple radial grooves distributed around the pressing surface. This allows oil flow paths to be established in different circumferential positions, enabling the elastic member to deform radially inward without being blocked by a single continuous radial groove, thus resolving the conflict between cooling efficiency and shock absorption
Solution Approach 2:
The pressing surface is segmented into multiple regions with individual radial grooves distributed circumferentially rather than having one large radial groove. This segmentation allows the elastic member to deform in segments between the grooves, maintaining both effective oil flow paths for cooling and sufficient material continuity for shock absorption
2Reliability
If the elastic member is made more compliant to improve shock absorption, then engagement shock is reduced, but the ability to transmit pressing force is worsened
Solution Approach 1:
The elastic member is designed with dynamic characteristics that allow it to be compliant during engagement (absorbing shock) while maintaining sufficient stiffness during the pressing phase. The radial grooves in the piston enable the elastic member to deform radially inward during engagement, then recover and transmit force effectively during pressing, achieving both shock absorption and force transmission
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 effectively absorbs engagement shocks through increased elastic deformation of the elastic member, ensuring suitable assembly and improved performance even when the piston presses the friction plate with radial grooves.
Implementation Method 1
an elastic member disposed between the piston and the friction plate in the axial direction so as to be elastically deformed by a pressing force of the piston
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A friction engagement device (1) includes an elastic member (20) between a piston (10) and a friction plate (51) in an axial direction (L). The elastic member (20) includes: a second engaged portion to be brought into engagement with an engagement portion of a tubular member (30) so as to be movable in the axial direction (L); and an annular plate portion sandwiched between a pressing surface (14) of the piston (10) and the friction plate (51) from both sides in the axial direction (L). A surface of the annular plate portion facing a first axial side (L1) is provided with a projection and a recess arranged alternately in a circumferential direction. Assuming that a phase where a radial groove (14b) provided in the pressing surface (14) and a projection provided on the annular plate portion are located at corresponding positions in the circumferential direction is a particular phase, the engagement portion of the tubular member (30), a first engaged portion of the piston (10), and the second engaged portion of the elastic member (20) are formed such that the piston (10) and the elastic member (20) are unable to come into engagement with the tubular member (30) at the particular phase.