High-Pressure Fuel Pump Height Reduction via Spring Nesting
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Solution Overview
Problem
The challenge is to design a high-pressure fuel supply pump that minimizes its height while accommodating a spring holding member, given the limited space in a cylinder block with various attached parts.
Innovation Solution
The pump features a pump body with a flange portion for fixing to a high-pressure fuel supply pump mounting portion, a cylinder inserted into the pump body, and a spring holding member with an outer peripheral portion press-fitted and fixed to the pump body, allowing the spring holding member to bias the pump body and reduce its overall height.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the pump body height is reduced to minimize space in the cylinder block, then the space utilization is improved, but the spring holding member cannot be properly accommodated
Solution Approach 1:
The spring holding member is repositioned from a conventional location to the lower end portion of the cylinder, utilizing the axial dimension more efficiently. This dimensional reconfiguration allows the spring holding member to be accommodated within the reduced pump body height by placing it at the lowermost available space, thus resolving the contradiction between compact height and component accommodation.
Solution Approach 2:
The spring holding member is nested within the cylinder structure at its lower end portion, integrating it into the existing cylindrical geometry. This nesting approach allows the spring holding member to occupy space within the cylinder's lower section without increasing the overall pump body height, effectively solving the space constraint while maintaining functional requirements.
2Volume of moving object
If the spring holding member is positioned at the lower end of the cylinder, then the pump body height is reduced, but the spring portion must be precisely positioned above the flange portion
Solution Approach 1:
The spring holding member is pre-positioned at the lower end portion of the cylinder during assembly, establishing a fixed reference point before the spring portion is installed. This preliminary positioning ensures that when the spring is installed, its lowest end naturally aligns above the flange portion, reducing the need for high-precision adjustment and simplifying the manufacturing process.
Solution Approach 2:
The design accepts a simplified manufacturing approach where exact precision is achieved through the structural arrangement rather than complex machining. By positioning the spring holding member at the lower end and allowing the spring to extend upward, the system achieves functional alignment without requiring high-precision manufacturing, effectively trading manufacturing complexity for structural simplicity.
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 enables the high-pressure fuel supply pump to effectively hold a spring holding member while minimizing the pump body's height, optimizing space usage in the engine cylinder block.
Implementation Method 1
a spring portion for biasing the pump body between the outer peripheral portion and the inner peripheral portion
Implementation Method 2
a spring holding member having an outer peripheral portion press-fitted and fixed to the pump body
Data Source
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AI summary
An object of the present invention is to supply a high-pressure fuel supply pump capable of holding a spring holding member while reducing the height of the pump body. A high-pressure fuel supply pump is provided with a pump body for forming a pressurizing chamber at an inner wall portion, and a flange portion for fixing the pump body to a high-pressure fuel supply pump mounting portion. The high-pressure fuel supply pump is provided with a cylinder and a spring holding member. The cylinder is inserted into a hole portion of the pump body from a lower side and in which the pressurizing chamber is formed further above an uppermost end surface. The spring holding member has an outer peripheral portion press-fitted and fixed to the pump body and a holding portion holding a spring portion for biasing the pump body between the outer peripheral portion and the inner peripheral portion. A spring-side lowest end portion of the holding surface of the spring holding member is disposed above the lowermost end portion of the flange portion.