Disc Brake Pad Clip Structure for Stable Light-Braking Posture
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Solution Overview
Problem
Disc brake devices experience unstable pad posture and brake noise during light braking due to reduced hydraulic pressure and pressing force, particularly when switching between forward and reverse movement or during deceleration traveling.
Innovation Solution
A disc brake device design where a pad clip applies a pressing force to the pad, ensuring the radially inner side of the pin insertion portion is pressed against the pin, allowing moments to act on the pad to stabilize its posture during braking, with the pad clip elastically deformed to apply a radially outward force to the pad, maintaining stability during both forward and reverse braking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the pad is supported by pins without additional pressing mechanisms, then the device complexity is reduced, but the pad posture becomes unstable during light braking causing brake noise
Solution Approach 1:
A pad clip is introduced as an intermediary component between the pad and the pin. The pad clip presses the radially inner side portion of the pad against the pin, acting as a mediator that ensures stable contact and prevents pad posture instability during light braking conditions.
Solution Approach 2:
The pad clip applies preliminary pressing force to the pad in the radial direction before braking occurs. This preliminary action ensures that the pad is already properly positioned and pressed against the pin, preventing instability and noise during light braking when hydraulic pressure is low.
2Reliability
If the pad clip presses the pad radially outward strongly, then the pad posture stability is improved, but the elastic deformation of the pad clip increases
Solution Approach 1:
The pressing force applied by the pad clip is optimized to a specific range. The clip is designed to apply sufficient radial pressing force to stabilize the pad posture, but not so much force as to cause excessive elastic deformation. This parameter optimization balances stability requirements with component durability.
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 prevents brake noise during light braking by stabilizing the pad posture and ensuring proper alignment of torque and moment transmission surfaces, enhancing braking performance.
Implementation Method 1
the pad clip elastically deformed to apply a radially outward force to the pad
Implementation Method 2
a disc brake device obtains a braking force by pressing a pad... against a side surface of a rotor
Data Source
Figure 1
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Figure 3
AI summary
A disc brake device (1a) in which a moment (M1, M2) acts on a pad (3a 4a) in a direction in which a rotation-in side portion is pushed up toward a radially outer side during braking, including the pad (3a, 4a) including a pin insertion portion (12c, 12d) and a clip insertion portion (45), a pad support member, including a pin (11c, 11d) inserted into the pin insertion portion (12c, 12d) in an axial direction, and supporting the pad (3a, 4a) so that the pad (3a, 4a) is movable in the axial direction, and a pad clip (20a, 20b, 20c), including a pad pressing portion (60a, 60b, 60c, 60d) inserted into the clip insertion portion (45) in the axial direction, and configured to press the pad radially outward. The pad clip (20a, 20b, 20c) is configured to apply a pressing force to the pad (3a, 4a) so that a radially inner side portion of an inner peripheral surface of the pin insertion portion (12c, 12d) is pressed against a radially inner side portion of the pin (11c, 11d).