Pedal Actuating Device Push Rod Truncated Cone Assembly
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Solution Overview
Problem
Existing actuating devices with a pedal lever and push rod can result in incorrect installation of the push rod, leading to potential damage to brake or clutch devices due to the push rod getting caught in an incorrectly installed position, causing safety issues and high repair costs.
Innovation Solution
The actuating device features a receiving part with an inner and outer truncated cone arrangement, where the inner cone acts as a funnel-shaped receptacle for the push rod, and the outer cone functions as a sliding bevel, preventing incorrect insertion and ensuring secure engagement of the push rod, with a bearing ball and spring clip mechanism for secure locking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a funnel-shaped receiving part is used to guide the push rod, then the assembly process is simplified and automatic assembly becomes possible, but the push rod can get caught in an incorrectly installed position causing damage
Solution Approach 1:
The receiving part is divided into two distinct conical surfaces: an inner truncated cone for receiving the push rod and an outer truncated cone acting as a sliding bevel. This segmentation allows the inner cone to guide correct insertion while the outer cone prevents incorrect installation by providing a sloped barrier that deflects misaligned push rods.
Solution Approach 2:
The outer truncated cone is positioned preliminarily to counteract potential incorrect insertion before it can cause damage. When the push rod approaches at an incorrect angle, the outer cone's sloped surface creates opposing force that deflects the push rod back, preventing it from getting caught in the bearing socket.
2Extent of automation
If a spherical bearing head and bearing cup connection is used, then fully automatic final assembly becomes possible, but there is no prevention against incorrect installation positions
Solution Approach 1:
The receiving part employs asymmetric conical surfaces rather than symmetric spherical connections. The inner truncated cone provides a tapered guide that naturally directs the push rod into the correct position, while the outer truncated cone creates an asymmetric barrier that only allows correct angular approach, preventing automatic assembly errors.
3Ease of operation
If the push rod is allowed to move freely during assembly, then assembly is easier, but the push rod can be installed in incorrect positions leading to brake or clutch device damage
Solution Approach 1:
The outer truncated cone performs a preliminary action by deflecting incorrectly aligned push rods before they can reach the bearing socket. This preliminary deflection action prevents harmful incorrect installation while maintaining ease of correct assembly, as properly aligned push rods pass through unaffected.
Data Source
Figure 1~2
Figure 3~4
AI summary
In an actuating device comprising a pedal and a push rod articulated thereon for transmitting a force exerted on the pedal, wherein the push rod is mounted in a receiving part fastened to the pedal, the receiving part has an inner and an outer truncated cone which are connected to one another such that the large base surface area of the inner truncated cone oriented in the direction of the push rod forms the small base surface area of the outer truncated cone, and wherein the receiving part is formed by the lateral faces of the truncated cones which are connected to one another.