Brake Device Gap Adjustment Mechanism for Wear Compensation
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Solution Overview
Problem
Existing brake devices with automatic gap adjustment mechanisms struggle to maintain a constant gap between the brake shoe and the tread surface as wear progresses, leading to inefficient adjustment and potential loss of braking performance.
Innovation Solution
A brake device with a gap adjustment mechanism that includes a control section, an operation member, and a position adjustment section, where the operation member moves along the braking direction and changes the initial position of the advancing and retreating member based on relative movement, ensuring accurate gap adjustment even with wear-induced changes in the brake shoe's position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional automatic gap adjustment mechanism is used, then the gap can be adjusted when wear occurs, but the adjustment becomes inefficient and inaccurate when the initial stroke position moves significantly towards the braking side due to progressive wear
Solution Approach 1:
The patent introduces a cam mechanism that converts the linear motion of the brake shoe along the braking direction into rotational motion of the cam. This dimensional transformation allows the gap adjustment to occur in a different kinematic space, enabling accurate adjustment even when the linear stroke position has shifted significantly due to wear. The cam's rotational movement provides a new degree of freedom for precise gap control independent of the brake shoe's linear position.
Solution Approach 2:
The patent changes the operational parameters of the gap adjustment mechanism by using a cam profile with varying radius. As the cam rotates, the distance between the cam center and the brake shoe changes continuously, allowing precise control of the gap distance. This parameter change enables the system to achieve accurate gap adjustment regardless of the brake shoe's initial position shift caused by wear.
2Adaptability or versatility
If the brake shoe's initial position shifts towards the braking side due to wear, then wear compensation is achieved, but the conventional adjustment mechanism becomes less effective
Solution Approach 1:
The cam mechanism is designed to anticipate and compensate for the position shift caused by wear before it affects braking performance. The cam profile is预先 designed to provide the necessary adjustment movement as the brake shoe wears, ensuring that the gap is continuously maintained at the optimal value. This preliminary action prevents the adjustment mechanism from becoming ineffective rather than reacting after wear has occurred.
Solution Approach 2:
The cam mechanism provides continuous feedback-based adjustment as the brake shoe position changes due to wear. The varying cam profile automatically adjusts the gap based on the accumulated wear, creating a self-regulating system that maintains reliable performance. The cam's rotational position naturally correlates with the wear amount, providing implicit feedback that drives the correction action.
3Ease of operation
If the push rod moves along a curved stroke, then the brake shoe can contact the tread surface, but the gap adjustment mechanism based on linear movement becomes inaccurate
Solution Approach 1:
The patent resolves the conflict between curved linear motion and precise gap adjustment by introducing rotational motion as a second dimension. The cam converts the complex curved linear displacement into simple rotational motion, which can be precisely controlled. This dimensional change allows the system to maintain accurate gap adjustment precision while accommodating the curved stroke path required for proper brake shoe contact.
Solution Approach 2:
The cam acts as an intermediary mechanism between the linearly moving brake shoe and the gap adjustment system. It translates the curved linear motion of the brake shoe into rotational motion that can be precisely used for gap adjustment. This intermediary element decouples the accuracy requirements from the complex curved motion, allowing precise adjustment independent of the stroke path.
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 maintains a consistent gap between the braking target and the damper, ensuring reliable braking performance even as the tread surface wears, by adjusting the initial position of the damper in response to wear-induced movements.
Implementation Method 1
the pawl 148 rides over a tooth of the ratchet gear 144, and engages with the tip of the next tooth
Implementation Method 2
a roller 154 provided at the end of the adjustment push rod 147 rolls upon the incline surface of the cam 141
Data Source
AI summary
A brake device includes: a damper; an advancing and retreating member; and a gap adjustment mechanism. The gap adjustment mechanism has: a control section having a control surface facing an opposite side to a braking direction; an operation member whose movement is controlled by contacting the control surface as the advancing and retreating member advances towards the braking side in the braking direction, thereby enabling relative movement with respect to the advancing and retreating member towards the opposite side to the braking direction; and a position adjustment section which, when the advancing and retreating member advances towards the braking side in the braking direction, and the operation member relatively moves with respect to the advancing and retreating member, changes an initial position of the advancing and retreating member according to the relative movement amount of the operation member.