Electric Disk Brake Layout Using Slide Pin Axis Extension
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Solution Overview
Problem
Conventional disk brakes require increased sizes of electric motors and transmission mechanisms to achieve high braking force and responsiveness, leading to larger caliper and carrier sizes, which impairs mountability and increases weight.
Innovation Solution
A disk brake design where at least part of the driving mechanism, including the electric motor and speed reduction mechanism, is positioned on the extension of a slide pin, allowing for compact configuration and preventing size increases, thereby improving mountability and reducing weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the output of the electric motor and the speed reduction ratio of the transmission mechanism are increased to acquire great braking force and excellent responsiveness, then the braking performance is improved, but the sizes of the electric motor and transmission mechanism increase
Solution Approach 1:
The patent positions the driving mechanism on the extension of the slide pin axis, utilizing the axial direction (another dimension) rather than increasing radial or tangential dimensions. This allows the electric motor and transmission mechanism to be arranged along the axial direction of the slide pin, effectively using unused spatial dimension to accommodate larger components without increasing the overall caliper size.
Solution Approach 2:
The patent employs a floating caliper structure where the caliper body can move axially along the slide pin. This dynamic arrangement allows the driving mechanism to be positioned on the slide pin extension while maintaining proper engagement with the brake pads, enabling compact configuration despite increased motor size for greater braking force.
2Device complexity
If the slide pin is disposed on the outer side in the radial direction or tangential direction of the disk rotor to avoid the electric motor and transmission mechanism, then the space for the driving mechanism is freed, but the sizes of the caliper and carrier increase
Solution Approach 1:
The slide pin serves multiple functions: it supports the floating caliper structure, provides a mounting location for the driving mechanism on its extension, and enables axial movement of the caliper. By making the slide pin a multi-functional component, the patent eliminates the need to relocate it to the outer side, thereby preventing increases in caliper and carrier sizes.
Solution Approach 2:
The patent merges the function of the slide pin with the mounting structure for the driving mechanism. The driving mechanism is positioned on the extension of the slide pin, combining the support function and the mounting function into a single integrated arrangement, which prevents the need to increase caliper and carrier sizes.
3Power
If the sizes of the electric motor and transmission mechanism are increased to achieve high braking force, then the braking performance is improved, but the weight increases
Solution Approach 1:
By arranging the driving mechanism on the axial extension of the slide pin rather than increasing radial dimensions, the patent enables more efficient packaging of heavier components. This dimensional arrangement allows the weight increase from larger motors to be accommodated without proportionally increasing the overall caliper size, thereby mitigating the weight penalty.
4Ease of manufacture
If the driving mechanism is positioned conventionally to avoid interfering with other components, then the assembly is simplified, but the caliper size increases
Solution Approach 1:
The patent utilizes the axial direction along the slide pin extension as an underutilized dimension for positioning the driving mechanism. This approach maintains assembly simplicity by following the existing slide pin axis while effectively reducing the caliper size compared to conventional radial or tangential arrangements.
Data Source
AI summary
The present disk brake includes a carrier fixed to a non-rotatable portion of a vehicle, a caliper attached to this carrier and including a piston configured to press an inner brake pad, a slide pin fixed to any of the carrier and the caliper and configured to allow the caliper to slidably move relative to the carrier in an axial direction of a wheel, and a driving mechanism including an electric motor and a speed reduction mechanism and configured to transmit a driving force of the electric motor to the piston via the speed reduction mechanism. At least a part of the driving mechanism is disposed on an extension of an axis of the slide pin. This configuration can prevent an increase in the size of the present disk brake, thereby improving the mountability thereof onto a vehicle.