Vehicle Motor Shaft Axial Thrust Gap Prevention
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Solution Overview
Problem
Existing small-sized motor apparatuses for vehicles require complex assembly processes, such as caulking or screwing, which increase production costs and reduce productivity due to the need for molds and apparatuses, and have issues with axial thrust gap prevention.
Innovation Solution
A small-sized motor apparatus with a frame that includes a drive shaft, a driven shaft, a cover, a plate-shaped washer member, and a gap spring member with a tapered structure and elastic deformable components to prevent axial movement of the driven shaft, eliminating the need for a sleeve structure and associated assembly complexities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sleeve structure with caulking or screw assembly is used to prevent axial movement of the output shaft, then the axial thrust gap prevention is improved, but the device complexity and manufacturing cost increase due to additional assembly processes and molds
Solution Approach 1:
The invention extracts and eliminates the sleeve component from the system. Instead of using a separate sleeve that requires caulking or screw assembly, the output shaft is designed with an integrated axial movement prevention structure featuring external ribs that directly engage with the gear housing, removing the need for the sleeve and its complex assembly processes
Solution Approach 2:
The invention merges the axial movement prevention function into the output shaft itself. The external ribs are formed as an integral part of the output shaft structure, combining the shaft's rotational function with the thrust gap prevention function, thereby eliminating the need for a separate sleeve component
2Reliability
If a sleeve structure with caulking or screw assembly is used to prevent axial movement of the output shaft, then the axial thrust gap prevention is improved, but the productivity decreases due to time-consuming assembly processes
Solution Approach 1:
The invention extracts and eliminates the sleeve component from the system. Instead of using a separate sleeve that requires caulking or screw assembly, the output shaft is designed with an integrated axial movement prevention structure featuring external ribs that directly engage with the gear housing, removing the need for the sleeve and its complex assembly processes
Solution Approach 2:
The axial movement prevention structure is pre-formed as an integral part of the output shaft during shaft manufacturing. The external ribs are created in advance as part of the shaft fabrication process, so no additional assembly steps are needed during motor assembly, thereby improving productivity
3Reliability
If a sleeve structure is used to prevent axial movement of the output shaft, then the axial thrust gap prevention is improved, but the manufacturing cost increases due to additional molds and apparatuses
Solution Approach 1:
The invention extracts and eliminates the sleeve component from the system. Instead of using a separate sleeve that requires caulking or screw assembly, the output shaft is designed with an integrated axial movement prevention structure featuring external ribs that directly engage with the gear housing, removing the need for the sleeve and its complex assembly processes
Solution Approach 2:
The invention merges the axial movement prevention function into the output shaft itself. The external ribs are formed as an integral part of the output shaft structure, combining the shaft's rotational function with the thrust gap prevention function, thereby eliminating the need for a separate sleeve component and associated manufacturing resources
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 improves assemblability and reduces manufacturing costs by using a gap spring member to prevent axial movement, allowing for precise gap adjustment and eliminating the need for caulking or screwing processes, thereby enhancing productivity and simplifying the motor apparatus structure.
Implementation Method 1
a drive shaft installed to the frame and rotating according to the electromagnetic induction law
Implementation Method 2
a gap spring member preventing an axial movement of the driven shaft, the gap spring member being assembled in a radial direction of the driven shaft and installed such that one side of the gap spring member is contact-supported by the plate-shaped washer member and the other side of the gap spring member is supported by the frame
Data Source
AI summary
A small-sized motor apparatus for a vehicle, includes: a frame; a drive shaft mounted to the frame, a driven shaft to rotate dependently on the drive shaft, the driven shaft including a second worm gear; a cover coupled to the frame; a plate-shaped washer member; and a gap spring member preventing an axial movement of the driven shaft, the gap spring member being assembled in a radial direction of the driven shaft and installed such that one side of the gap spring member is contact-supported by the plate-shaped washer member and the other side of the gap spring member is supported by the frame, wherein the frame includes a slide groove that accommodates both ends of the gap spring member and the plate-shaped washer member and restricts the gap spring member from moving in an axial direction of the driven shaft.