Nested Cylinder Covers Reduce Fluid Pressure Cylinder Length
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Solution Overview
Problem
Conventional fluid pressure cylinders have high manufacturing costs due to extensive processing requirements for elliptical gaskets and increased size due to bolted head and rod covers, leading to increased dimensions.
Innovation Solution
A fluid pressure cylinder design featuring a tubular cylinder body with elliptical cylinder holes, recesses, and ring grooves for locking rings, along with elliptical head and rod covers with projections and o-rings for airtight seals, reducing processing needs and size by using projections and locking rings for secure assembly without bolts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bolted head and rod covers are used to close the cylinder chamber, then the sealing and structural integrity are ensured, but the longitudinal dimension of the fluid pressure cylinder is increased
Solution Approach 1:
The head cover and rod cover are nested within the cylinder body by forming recesses at both ends of the cylinder hole. The covers are positioned inside these recesses rather than protruding outward, effectively nesting the cover structures within the main cylinder volume. This reduces the overall longitudinal dimension while maintaining sealing integrity through the nested configuration.
Solution Approach 2:
The invention transitions from a conventional external bolted cover structure to an internal recessed cover structure. By moving the covers into the longitudinal dimension of the cylinder body (into the existing volume) rather than extending beyond it, the overall length is reduced while the sealing function is maintained through the recess-c cover integration.
2Reliability
If elliptical gaskets are used with extensive surface processing, then the airtight seal between covers and cylinder body is maintained, but the manufacturing cost is steeply increased
Solution Approach 1:
The invention extracts the sealing function from the complex elliptical gasket structure and relocates it to simple O-rings positioned in grooves on the head cover and rod cover. This eliminates the need for extensive processing of elliptical gaskets while maintaining the airtight seal, as the O-rings provide sealing in a simpler, more manufacturable configuration.
Solution Approach 2:
The invention replaces expensive, heavily processed elliptical gaskets with simpler, cheaper O-rings. While O-rings may have shorter service life in some applications, they significantly reduce manufacturing cost and processing complexity while providing adequate sealing performance for the fluid pressure cylinder application.
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 design reduces manufacturing costs and minimizes the size of the fluid pressure cylinder by simplifying processing and assembly, ensuring airtight seals without protruding covers, and preventing blockages and detachment of covers.
Implementation Method 1
O-rings 40 are installed on the outer circumferential surfaces of the head cover 14 and the rod cover 16, in annular grooves respectively formed thereon. When the head cover 14 and the rod cover 16 are installed onto both ends of the cylinder tube 12, an airtight state is maintained by abutment of the O-rings 40 against the inner circumferential surfaces of the cylinder tube 12.
Data Source
AI summary
A pair of recesses is formed on a cylinder hole of a cylinder tube, wherein the recesses are recessed further into the cylinder hole from an inner circumferential surface thereof. Projections that correspond to the recesses are disposed on a head cover and a rod cover, respectively, which are installed into both ends of the cylinder tube. The head cover and the rod cover that are accommodated in the cylinder hole are positioned through abutment of the projections against stepped portions of the recesses.