Vehicle Electronic Braking Device with Guide Member
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Solution Overview
Problem
Existing electric braking devices for vehicles face challenges in securing relative location accuracy between the ratchet wheel and pawl member, which is crucial for a miniaturized parking brake mechanism, and require improved workability and assembly simplicity.
Innovation Solution
An electric braking device design that includes a ratchet wheel fixed to a power transmission member, a pawl member that can move linearly and be interlocked with the ratchet wheel, a guide member for precise movement, and a solenoid with independent components for assembly, ensuring secure interlocking and miniaturization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a direct drive structure with solenoid is used to miniaturize the device, then device size is reduced, but relative location accuracy between ratchet wheel and pawl member becomes difficult to secure
Solution Approach 1:
A guide member is introduced as an intermediary component to guide the movement of the pawl member and secure its position relative to the ratchet wheel. The guide member has a guide hole through which the pawl member moves, ensuring precise relative positioning while allowing the compact direct drive structure to be maintained.
Solution Approach 2:
The solenoid is divided into independent fixed member and movable member that can be assembled separately. The fixed member is fixed to the caliper while the movable member moves independently, allowing for easier assembly and better positioning accuracy in the miniaturized structure.
2Reliability
If oscillating arm structure is used to interlock pawl member with ratchet wheel, then reliable interlocking is achieved, but device complexity increases
Solution Approach 1:
The oscillating arm is removed from the structure and replaced with a simpler linear movement mechanism. The pawl member moves directly linearly along the guide member's guide hole, eliminating the need for the oscillating arm while maintaining reliable interlocking through the guide member's constraints.
3Ease of manufacture
If solenoid components are integrated into single piece, then assembly is simplified, but workability and assembly flexibility are reduced
Solution Approach 1:
The solenoid is segmented into fixed member and movable member that can be manufactured and prepared separately, then assembled together. This segmentation improves workability by allowing separate manufacturing optimization while the simple assembly process maintains ease of manufacture.
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 secures relative location accuracy between the ratchet wheel and pawl member, enabling miniaturization of the parking brake mechanism while improving workability and simplifying assembly, thus enhancing the device's performance and reliability.
Implementation Method 1
a solenoid (SOL) having a fixed member (BAS, COL) fixed to the caliper (CRP) and a movable member (PLN, PBR) disposed to be able to move in the first linear direction with reference to the fixed member (BAS, COL) and engaged with the pawl member (TSU)
Implementation Method 2
an elastic member (SPR) always pressing the pawl member (TSU) in a release direction (Dtr) opposing the interlocking direction (Dts) in the first linear direction
Data Source
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AI summary
The present invention is provided with a power transmission member (INP) rotatably supported by a caliper (CRP), and a ratchet wheel (RCH) fixed by said member (INP). A first linear direction movement of a pawl member (TSU) that engages with a mobile member (PBR) of a solenoid (SOL) is guided by a guide member (GID) fixed by the caliper (CRP). The pawl member (TSU) is continuously pressed in a release direction (Dtr) by an elastic member (SPR). The interlocking force in an interlocking direction (Dts), imparted by mobile member (PBR) of the solenoid (SOL) mobile member (PBR) to the pawl member (TSU), and the release force in the release direction (Dtr), which is imparted by the elastic member (SPR) to the pawl member (TSU) oppose each other, and the interlocking force is larger than the release force. The pawl member (TSU) and the mobile member (PBR) move linearly together in one of the interlocking direction (Dts) and the release direction (Dtr).