Electromechanical Disc Brake Tappet Retention Against Fall-Out
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Solution Overview
Problem
Current disc brake electromechanical actuators suffer from the tappet not being securely fixed in the housing, leading to potential fall-out and disruption of force transmission, causing damage to the tappet, cam disc, and housing.
Innovation Solution
Incorporating a stop mechanism in the cam disc to clamp the rotary lever axially and prevent rotational movement, along with a gap between the tappet guide and housing to limit movement, and using springs or retention elements to secure the tappet in place, ensuring it remains installed and prevents jamming.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the tappet is not securely fixed in the housing, then the assembly is simpler, but the tappet may fall out causing damage and brake failure
Solution Approach 1:
The housing is divided into a guide region and a retention region, with the retention region providing a secure mounting location for the tappet. This segmentation allows the tappet to be easily guided during assembly while being securely retained in place, resolving the contradiction between simple assembly and reliable retention.
Solution Approach 2:
A retention element acts as an intermediary component between the tappet and the housing. This intermediary provides a simple yet effective retention mechanism that prevents tappet fall-out without complicating the overall assembly structure.
2Reliability
If the tappet is tightly fixed in the guide, then the tappet cannot fall out, but the tappet may become jammed due to manufacturing tolerances
Solution Approach 1:
The housing provides different local qualities: the guide region has a tighter fit to prevent lateral movement and fall-out, while the retention region provides secure mounting. This local differentiation allows the tappet to be reliably retained without being overly constrained, preventing jamming while maintaining retention reliability.
3Reliability
If the tappet is retained with a spring, then the tappet remains in position, but the device complexity increases
Solution Approach 1:
The retention element is designed as a simple, inexpensive component that provides effective tappet retention without the complexity of spring mechanisms. This simple retention element achieves reliable position stability while minimizing device complexity.
Data Source
AI summary
The present disclosure relates to a disc brake having an electromechanical actuator for vehicles, in particular for utility vehicles, comprising a brake disc, a brake carrier and a brake caliper of a vehicle for applying the brake disc by means of brake linings. Current tests have shown that the tappet after assembly is not fixed correctly in a housing of the electromechanical actuator. The tappet may after positioning fall out of the rotary lever, which results in the force transmission for applying the brake disc being interrupted and the brake disc not being able to be applied. An object of the present disclosure is to overcome the problems from the prior art and to provide a disc brake with an electromechanical actuator which reduces or even prevents damage to the tappet, the cam disc and the housing of the electromechanical actuator.