Nested Lead Screw Output Shaft Layout for Compact E-Brakes
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Solution Overview
Problem
Existing electro-mechanical brake apparatuses face challenges in miniaturization due to their axial size, which hinders their integration into limited vehicle wheel spaces.
Innovation Solution
The integration of a lead screw within an output shaft, combined with a brake caliper and speed reducer, reduces the axial length by embedding or nesting the output shaft in an axial groove or protrusion, facilitating a compact structure and efficient transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the lead screw and output shaft are arranged in parallel or separate configurations, then the structural simplicity is maintained, but the axial size increases and miniaturization is hindered
Solution Approach 1:
The lead screw is nested within the output shaft, with the lead screw positioned inside the hollow cylindrical structure of the output shaft. This nesting arrangement allows both components to occupy the same axial space, significantly reducing the overall axial size of the brake apparatus while maintaining the functional independence of both components
Solution Approach 2:
The design transitions from a conventional parallel arrangement (occupying separate axial spaces) to a radial arrangement where the lead screw is positioned inside the output shaft. This dimensional reorganization places components in the radial direction rather than axial direction, achieving miniaturization in the critical axial dimension
2Adaptability or versatility
If the output shaft is made larger to accommodate the lead screw externally, then the manufacturing is simplified, but the axial length increases and adaptation to wheel space is hindered
Solution Approach 1:
The lead screw is nested within the output shaft, with the lead screw positioned inside the hollow cylindrical structure of the output shaft. This nesting arrangement allows both components to occupy the same axial space, significantly reducing the overall axial size of the brake apparatus while maintaining the functional independence of both components
Solution Approach 2:
The design transitions from a conventional parallel arrangement (occupying separate axial spaces) to a radial arrangement where the lead screw is positioned inside the output shaft. This dimensional reorganization places components in the radial direction rather than axial direction, achieving miniaturization in the critical axial dimension
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 minimizes the axial size of the brake apparatus, allowing for better adaptation to vehicle wheel spaces and providing a more compact, efficient braking mechanism.
Implementation Method 1
the screw nut is configured to move with rotation of the lead screw in an axial direction of the lead screw
Implementation Method 2
the brake caliper is configured to: fasten the speed reducer and accommodate the lead screw and the screw nut
Data Source
AI summary
A vehicle and an electro-mechanical brake apparatus which includes a brake caliper, a ball lead screw, and a speed reducer. The ball lead screw includes the lead screw and a screw nut, the speed reducer includes the output shaft, one end of the output shaft is configured to drive the lead screw to rotate, the screw nut is configured to move with rotation of the lead screw in an axial direction of the lead screw, and the brake caliper is configured to: fasten the speed reducer and accommodate the lead screw and the screw nut. An end face of the lead screw faces the speed reducer in the axial direction of the lead screw, and the end face includes: an axial groove or an axial protrusion. The electro-mechanical brake apparatus in the reduces an axial size of the electro-mechanical brake apparatus.