Opposed-Piston Disc Brake Caliper With Guided Parking Clamp
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Solution Overview
Problem
Conventional opposed-piston type disc brake devices with separate service and parking brake functions result in a large and heavy overall size, limited shape freedom of the knuckle, and instability in axial displacement of the clamp member, leading to potential twisting and dragging issues during parking brake operation.
Innovation Solution
The opposed-piston type disc brake device integrates a caliper with a parking mechanism that includes a clamp member and thrust generating mechanism, supported by guide cylinders and guide pins, allowing smooth axial displacement and reducing weight and size by combining service and parking brake functions within a single device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate disc brake devices are used for service brake and parking brake, then braking functions are reliable, but overall size and weight increase
Solution Approach 1:
The patent combines service brake and parking brake functions into a single integrated brake device. The caliper houses both service brake pistons and parking brake mechanisms (including a clamp member and thrust generating mechanism), eliminating the need for separate brake assemblies and reducing overall weight while maintaining reliable braking functions.
Solution Approach 2:
The caliper is designed as a multi-functional component that performs both service braking and parking braking operations. The same caliper structure accommodates service brake pistons and parking brake mechanisms, allowing one component to fulfill multiple braking functions, thereby reducing the number of separate components needed.
2Reliability
If separate disc brake devices are used for service brake and parking brake, then braking functions are reliable, but device complexity increases
Solution Approach 1:
The patent merges service brake and parking brake systems into a unified caliper assembly. By integrating both braking mechanisms within the same caliper housing and using shared components such as the rotor and mounting structure, the overall device complexity is reduced compared to having completely separate brake assemblies.
Solution Approach 2:
The caliper is designed as a universal component that handles both service and parking brake operations. This multi-functionality reduces the number of separate components needed in the system, thereby simplifying the overall brake device architecture while maintaining reliable braking functions.
3Device complexity
If clamp member is supported without guide portions, then device complexity is reduced, but axial displacement stability deteriorates
Solution Approach 1:
The patent introduces guide portions (guide pins and guide holes) as intermediary elements between the clamp member and the caliper. These guide portions act as mediators that constrain the clamp member's movement to pure axial displacement, preventing twisting and dragging while maintaining relative simplicity in the overall structure.
4Stability of the object's composition
If guide portions are added to support clamp member, then axial displacement stability is improved, but device complexity increases
Solution Approach 1:
The guide portions serve as simple intermediary elements that provide axial guidance for the clamp member. By using straightforward guide pins and guide holes rather than complex mechanical linkages, the patent achieves stable axial displacement with minimal increase in device complexity.
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 integration reduces the overall size and weight of the brake device, enhances shape freedom of the knuckle, and stabilizes the axial displacement of the clamp member, ensuring effective and stable braking forces for both service and parking brake operations.
Implementation Method 1
the guide cylinder is fitted into the housing hole so as to relatively move in the axial direction, to form a first guide portion which supports the clamp member so that the clamp member is displaced relative to the cylinder in the axial direction
Implementation Method 2
the thrust generating mechanism includes an inner displacement member which is supported on the clamp base portion and is configured to be displaced axially inwardly relative to the caliper during braking operation
Implementation Method 3
the cylinders are configured to receive a pressure oil so that a braking force by a service brake is generated
Data Source
AI summary
An opposed-piston type disc brake includes a guide cylinder extending axially inward from an opening edge portion of a cylinder in which an outer displacement member of a thrust generating mechanism is disposed is provided in an inner body of a caliper at an axial inner side portion of the inner body. A clamp base portion of a clamp member of a parking mechanism portion includes a housing hole opened to an axial outer side of the clamp base portion in which an inner side displacement member of the thrust generating member is disposed. A guide cylinder extending axially inward from an opening edge portion of the cylinder is fitted into the housing hole so as to relatively move in the axial direction, to form a first guide portion which supports the clamp member so that the clamp member is displaced relative to the cylinder in the axial direction.