Commercial Vehicle Disc Brake Pressure Piece Segmentation
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Solution Overview
Problem
Existing disc brake clamping devices for commercial vehicles fail to provide a reliable and exact adjustment to compensate for clearance changes due to brake pad abrasion, leading to potential malfunctions.
Innovation Solution
A clamping device with interlocking elements, such as integrally formed teeth and tooth gaps, and an axially split sleeve with radial deformation capabilities, securely fixes the pressure piece to the threaded spindle, ensuring precise adjustment and preventing rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a locking ring is used to hold the pressure piece non-rotatably on the threaded spindle, then rotation prevention is achieved, but the connection becomes loose and adjustment precision deteriorates
Solution Approach 1:
The pressure piece is divided into a first pressure piece and a second pressure piece that can be adjusted relative to each other along the threaded spindle. The first pressure piece is fixed non-rotatably, while the second pressure piece can be axially adjusted to compensate for wear, allowing both rotation prevention and precise adjustment to be maintained throughout service life
Solution Approach 2:
The adjustable second pressure piece can be worn or adjusted over time while the first pressure piece remains fixed. When the second pressure piece reaches its adjustment limit, it can be replaced or repositioned, allowing the system to maintain precision throughout the entire service life rather than degrading after initial adjustment
2Manufacturing precision
If the pressure piece is securely fixed to the threaded spindle, then adjustment precision is improved, but the device complexity increases
Solution Approach 1:
The pressure piece is segmented into two parts: a first pressure piece that is simply fixed non-rotatably to the threaded spindle, and a second pressure piece that can be axially adjusted. This segmentation allows the system to achieve secure fixation and precise adjustment without requiring complex clamping mechanisms, as each segment has a simple, dedicated function
Solution Approach 2:
The threaded spindle serves multiple functions: it provides the clamping force to hold the pressure pieces, enables axial adjustment through threading, and prevents rotation through its engagement with the brake pad. This multi-functionality reduces the need for separate components, thereby reducing overall device complexity while maintaining adjustment precision
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 design allows for long-term precise readjustment and secure engagement with the brake pad, preventing rotation and ensuring reliable braking performance.
Implementation Method 1
an axially split sleeve, preferably made of sheet metal, can be used to fix the pressure piece axially on the threaded spindle a frictional connection is established
Implementation Method 2
the axial gap allows tolerance compensation to be created by radial deformation of the sleeve
Data Source
Figure 1
Figure 2a~2d
Figure 3a~3b
AI summary
A clamping device for a disc brake for a commercial vehicle, comprising a cross member (4) which is movable via a pivotable brake lever (2) and in which at least one brake piston corresponding to an adjusting device (9) is axially adjustable, wherein the brake piston has a threaded spindle (7) and a pressure piece (8) attached to it at an end face, which bears against a brake lining, and the threaded spindle (7) is screwed into a spindle nut (6) which is rotatably and axially secured in the cross member (4), wherein the pressure piece (8) is axially secured and rotationally fixed to the threaded spindle (7).