Hand Brake Assembly Anti-Rotational Lock Mechanism
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Solution Overview
Problem
Existing hand brake valves in vehicles, particularly in trucks and heavy vehicles, suffer from relative movements between the handle and metal rod due to wear and tear, leading to unreliable operation and safety concerns, as the torque transfer is not precise and may result in loss of locking function or lack of friction, making it unsafe for engaging and disengaging the parking brakes.
Innovation Solution
A hand brake valve assembly with a non-circular metal rod and a handle insert that includes structural means to prevent rotational movement, such as a pin and socket arrangement or a bush, ensuring that the actuation force is transferred effectively and maintaining the assembly's rigidity, while allowing rectilinear movement for proper actuation positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the handle is allowed to move freely on the metal rod, then the ease of operation is improved, but the reliability deteriorates due to wear and tear causing relative movements
Solution Approach 1:
A polymeric intermediate layer is introduced between the handle and the metal rod. This intermediate layer serves as a mediator that prevents direct metal-to-metal contact, thereby eliminating wear and tear while still allowing controlled movement. The polymeric material provides both friction for operational control and protection against degradation, resolving the contradiction between ease of operation and reliability.
2Reliability
If structural means are added to prevent rotational movement, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The anti-rotational structural means are merged with the existing handle and rod components rather than being separate additions. The polymeric intermediate layer is integrated directly into the handle assembly, and the structural features are combined with the existing geometry, thereby improving reliability without significantly increasing overall device complexity.
3Measurement precision
If the handle and metal rod are made rigidly connected, then the torque transfer precision is improved, but the ease of operation deteriorates due to lack of movement freedom
Solution Approach 1:
The connection between handle and metal rod is made dynamic rather than static. The polymeric intermediate layer allows controlled movement and rotation during operation, providing ease of use, while the anti-rotational structural means prevent excessive rotation that would compromise torque transfer precision. This dynamic balance resolves the contradiction between operational ease and precision.
Data Source
Figure 1a~1b
Figure 1c~1d
Figure 1e~1f
AI summary
The present invention relates to an assembly (100; 200) for a hand brake valve. The assembly (100; 200) comprises a metal rod (102; 202) with a non-circular external surface (102a; 202a), a handle insert (104; 204) at least partially surrounding the non-circular external surface (102a; 202a) of the metal rod (102; 202). More particularly, the assembly (100; 200) further comprises a structural means (100a; 200a) that is configured to prevent any rotational movement between the handle insert (104; 204) and at least the metal rod (102; 202). In accordance with the same or another embodiment, the structural means (100a; 200a) is further configured to allow a rectilinear movement of the handle insert (104; 204) in relation to at least the metal rod (102; 202).