Electromagnetic Valve Lead Line Weld Positioning
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Solution Overview
Problem
The conventional electromagnetically-driven valve mechanism has a weld-joined portion of the lead line within the magnetic circuit, increasing the magnetic resistance and reducing the magnetic biasing force between the core and the movable plunger, which affects the operation of the valve mechanism in high-pressure fuel supply pumps.
Innovation Solution
The lead line weld-joined portion is disposed externally of the magnetic circuit, reducing the total length of the magnetic circuit and allowing for a sufficient magnetic biasing force to be generated between the core and the movable plunger.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the lead line weld-joined portion is disposed internally of the magnetic circuit, then the electromagnetic coil can be connected to the terminal, but the total length of the magnetic circuit increases and magnetic resistance increases
Solution Approach 1:
The patent extracts the weld-joined portion of the lead line from the internal space of the magnetic circuit and relocates it to the external surface of the yoke. This extraction eliminates the need to accommodate the weld-joined portion within the magnetic circuit path, thereby maintaining the original magnetic circuit length and magnetic resistance while still achieving proper electrical connection of the electromagnetic coil.
2Length of stationary object
If the total length of the magnetic circuit is increased, then the magnetic resistance increases, but the magnetic biasing force decreases
Solution Approach 1:
The patent converts the potential harm of having the weld-joined portion occupy internal magnetic circuit space into a benefit by relocating it to the external surface. This transformation allows the magnetic circuit to maintain its optimal length and low magnetic resistance, thereby preserving sufficient magnetic biasing force for reliable valve operation.
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 enhances the magnetic biasing force, improving the operation of the valve mechanism and the efficiency of the high-pressure fuel supply pump by reducing magnetic resistance and enabling effective control of the valve opening and closing.
Implementation Method 1
a movable plunger operated by an electromagnetic force and a spring member biasing the movable plunger toward the side opposite the electromagnetic force
Implementation Method 2
a spring member biasing the movable plunger toward the side opposite the electromagnetic force
Implementation Method 3
Since the lead line weld-joined portion is disposed externally of the magnetic circuit, i.e., of the yoke, there is no need to provide a space adapted to receive the lead line weld-joined portion therein. Thus, the total length of the magnetic circuit can be reduced.
Data Source
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AI summary
In a conventional configuration, a lead line weld joined portion 55 between a lead line and an end of a terminal is disposed internally of an magnetic circuit, i.e., of a yoke portion 51. This increases the total length of the magnetic circuit, i.e., the yoke portion 51 by the axial dimension of the lead line weld joined portion 55. This will increase the magnetic resistance of the magnetic circuit, which leads to a problem with a reduction in the magnetic biasing force occurring between a first core portion 33 and an anchor 35. In the present invention, the lead line weld joined portion 55 is disposed externally of the magnetic circuit, i.e., of the yoke portion 51. This eliminates the necessity of a space adapted to receive the lead line weld joined portion 55 therein; therefore, the total length of the magnetic circuit can be reduced. It is possible, thus, to generate a sufficient magnetic biasing force between the first core portion 33 and the anchor 35.