Fluid Pressure Shock Absorber Pin Connection Assembly
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Solution Overview
Problem
The existing supporting structures for fluid pressure shock absorbers, such as those used in motorcycle front forks, require complex manufacturing processes and time-consuming screwing operations to secure the head member onto the cylinder tip, complicating assembly and increasing production time.
Innovation Solution
A fluid pressure shock absorber design featuring a head member supported on the cylinder tip with a ring-shaped stopper member and pin member connecting mechanism, eliminating the need for screw parts on the cylinder tip and simplifying the assembly process by using a pin member that passes through a hole in the stopper member, ensuring concentricity and easy integration of the inner and outer tubes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a screw part is formed on the tip of the cylinder to secure the head member, then the head member can be firmly attached to the cylinder, but the manufacturing process of the cylinder becomes complicated and the tip thickness must be increased
Solution Approach 1:
The invention divides the attachment function into two separate components: the head member with an external screw part and the cylinder with an internal screw part. This segmentation allows the head member to be attached to the cylinder through threading without requiring complex manufacturing processes on the cylinder tip, as the screw threads are formed on the head member instead.
Solution Approach 2:
The screw part acts as an intermediary mechanism between the head member and the cylinder. By introducing this threading interface on the head member rather than the cylinder, the invention mediates the attachment process in a way that simplifies cylinder manufacturing while still achieving firm attachment.
2Reliability
If a screw part is formed on the tip of the cylinder, then the head member can be securely attached, but the manufacturing time and assembly time increase
Solution Approach 1:
By segmenting the screw thread formation to the head member only, the invention reduces the number of manufacturing operations required on the cylinder. The cylinder只需 requires a simple internal thread formation, while the head member incorporates the external threads, thereby reducing overall manufacturing time while maintaining secure attachment.
3Device complexity
If the head member is supported directly on the cylinder tip, then the structure is simple, but concentricity between the cylinder and inner tube cannot be maintained
Solution Approach 1:
The head member serves as an intermediary component between the cylinder and the inner tube. By positioning the head member on the cylinder tip and allowing it to contact the inner tube, the invention mediates the concentricity requirement. The head member's cylindrical shape and its interaction with both the cylinder and inner tube naturally maintain concentric alignment without requiring complex positioning mechanisms.
Data Source
Figure 1
Figure 2A~2B
AI summary
A fluid pressure shock absorber comprises a cylinder 3 disposed in a tube 2 and having a base supported by the tube 2 and a head member 31 fitted onto a tip of the cylinder 3. A hole 2b is formed in the tube 2 facing the head member 31. A ring-shaped stopper member 101 is screwed onto an outer circumference of the head member 31. A pin member 102 held by the head member 31 and biased in a radial direction by a snap ring 103 penetrates the hole 2b, thereby making connection of the tube 2 and the cylinder 3 easy.