Hydraulic Unit Suction Strainer Fitted Connection
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Solution Overview
Problem
Conventional hydraulic units require time-consuming processing and assembly due to screw connections, which can lead to contamination and increased man-hours, and there is a risk of components like suction strainers and return pipes falling out, disrupting hydraulic fluid flow paths.
Innovation Solution
The hydraulic unit design features a suction strainer and return pipe with base end portions fitted into the hydraulic pump and manifold, respectively, without the need for screw threads, ensuring stable attachment and reducing processing and assembly time, with seal members and projections maintaining contact with the tank to ensure fluid flow paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If screw connections are used to connect the hydraulic pump and suction strainer, then the connection is secure, but processing time and assembly time increase
Solution Approach 1:
The invention extracts and eliminates the screw connection structure from the hydraulic system. Instead of using male and female screw threads to connect the suction strainer and hydraulic pump, the patent uses a direct fitting connection where the suction strainer is simply inserted into the pump housing, removing the time-consuming threading process entirely.
Solution Approach 2:
The invention segments the connection interface into a insertion hole in the hydraulic pump housing and a corresponding insertion portion on the suction strainer. This segmentation allows for a simple push-fit connection that eliminates the need for threaded fastening while maintaining secure attachment.
2Reliability
If screw connections are used to connect the manifold and return pipe, then the connection is secure, but assembly complexity increases
Solution Approach 1:
The invention removes the screw thread structure from the connection between the return pipe and manifold. The return pipe is designed with an insertion portion that directly fits into a corresponding hole in the manifold housing, eliminating the complex threading operation and reducing assembly complexity.
3Reliability
If screw threads are processed on hydraulic components, then secure connection is achieved, but contamination risk increases
Solution Approach 1:
The invention extracts the screw thread processing step from the manufacturing process. By using a simple insertion connection instead of threaded fastening, the patent eliminates the source of metal chips and other contaminants that are generated during thread cutting or tapping operations, thereby preventing contamination of the hydraulic fluid.
4Reliability
If the suction strainer is connected via screw threads, then the connection is secure, but manufacturing cost increases
Solution Approach 1:
The invention removes the screw thread machining operation from the manufacturing process of the suction strainer and hydraulic pump. The simple insertion connection requires no specialized threading equipment or complex machining steps, significantly reducing manufacturing costs while maintaining secure attachment through the fitted connection design.
Data Source
AI summary
A hydraulic unit is provided with: a manifold which forms a hydraulic circuit; a tank which is joined to the manifold; and a hydraulic pump which suctions hydraulic fluid in the tank and supplies the hydraulic fluid to the manifold, wherein the base end portion of a suction strainer is fitted into the hydraulic pump, and the suction strainer has such a shape that the base end portion of the suction strainer is not separated from the hydraulic pump in a state where the leading end portion of the suction strainer is in contact with the tank and an opening through which the hydraulic fluid is introduced from the tank is provided at the leading end portion.