Engine Starter Plunger Return Mechanism
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Solution Overview
Problem
The existing engine starter configurations face challenges with plunger displacement stability and smooth operation due to the dispersed placement of spring bearing pieces and varying urging forces, leading to instability and increased size, making it difficult to incorporate the plunger smoothly and maintain balanced displacement.
Innovation Solution
The introduction of an urging member at the inner diameter side of the exciting coil unit, which includes a ring-shaped plate with notched pressing pieces, urges the plunger to its non-acting position upon demagnetization, providing a balanced and stable displacement mechanism by concentrating the urging force directly on the plunger's tip end face.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If spring bearing pieces are formed at multiple positions on the outer diameter side of the first plunger, then the plunger can be returned to the non-acting position, but the plunger displacement becomes unstable and the device size increases
Solution Approach 1:
The invention moves the spring bearing surface from the outer diameter direction to the inner diameter direction, changing the dimensional orientation of the return mechanism. This allows the compression spring to act axially on the plunger tip rather than radially through multiple bearing pieces, improving displacement stability while maintaining the return function
Solution Approach 2:
The invention consolidates multiple spring bearing pieces into a single integrated spring bearing surface on the inner diameter side. This merging of multiple discrete return points into one unified axial return path eliminates the instability caused by dispersed forces and reduces the overall device size
2Reliability
If spring bearing pieces are dispersed in the circumferential direction, then the plunger can be urged to the non-acting position, but uniform pressing becomes troublesome and incorporation is difficult
Solution Approach 1:
The invention relocates the spring bearing function from the outer diameter/circumferential direction to the inner diameter/axial direction. This dimensional shift transforms a complex multi-point circumferential assembly into a simple single-point axial assembly, making incorporation straightforward and manufacturing easy
Solution Approach 2:
The invention extracts the spring bearing function from the first plunger's outer diameter surface and relocates it to the inner diameter side. This separation allows the compression spring to be independently positioned and installed on the inner diameter side, simplifying the incorporation process
3Reliability
If compression springs are used to urge the plunger, then the plunger can be returned to the non-acting position, but the device becomes larger in size
Solution Approach 1:
The invention reorients the spring mechanism from a radial configuration (requiring circumferential space for multiple bearing pieces) to an axial configuration (using the existing axial space between plunger and exciting piece). This efficient use of axial dimension reduces the overall device volume while maintaining the return function
Solution Approach 2:
The inner diameter side of the plunger serves dual functions: it acts as both the magnetic attraction surface during actuation and the spring bearing surface during return. This multi-functionality eliminates the need for separate outer diameter bearing pieces, reducing device size
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 configuration ensures smooth, balanced, and stable plunger displacement, simplifies incorporation, and prevents foreign matter interference, maintaining reliability and compactness while reducing the risk of axial deviation and deformation.
Implementation Method 1
an exciting piece that is positioned at a tip end side of the coil main body so as to be magnetized according to an excitation of the coil main body
Implementation Method 2
An urging member is provided at the inner diameter side of the exciting coil unit so as to urge the plunger to a side of the non-acting position according to demagnetization of the exciting piece
Data Source
AI summary
An electromagnetic controller includes an exciting coil unit that is provided with a coil main body and an exciting piece that is positioned at a tip end side of the coil main body so as to be magnetized according to an excitation of the coil main body; and a plunger that is disposed in a ring-shaped space formed at an inner diameter side of the exciting coil unit so as to be movable in the ring-shaped space in an axial center direction, the plunger being displaceable from a non-acting position to an acting position at a tip end side under an attracting force based on magnetization of the exciting piece, wherein an urging member is provided at the inner diameter side of the exciting coil unit so as to urge the plunger to a side of the non-acting position according to demagnetization of the exciting piece.