Coaxial Shock Absorber for Reciprocating Rods
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional shock absorbers for pneumatic cylinders are typically attached offset from the axial center, applying a bending moment to the reciprocating rod and guide rail, increasing the complexity and size of the apparatus, and requiring additional parts and space.
Innovation Solution
A coaxially attached shock absorber design featuring a hollow rod with an attaching hole, an outer cylindrical body, an annular piston, and a restoring mechanism, which absorbs impact forces without applying bending moments, eliminating the need for additional fixing jigs and allowing for adjustable stroke positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a shock absorber is attached offset from the axial center of the cylinder main body, then the shock absorber can be installed on the side face, but a bending moment is applied to the reciprocating rod and guide rail, increasing structural complexity and size
Solution Approach 1:
The shock absorber is positioned asymmetrically at the axial center of the reciprocating rod, utilizing the available space along the axial direction rather than requiring offset side-face mounting. This asymmetric positioning along the axis eliminates bending moments while maintaining installation simplicity.
Solution Approach 2:
The mounting position is moved from the lateral dimension (side face) to the axial dimension (along the rod axis). By utilizing the axial space rather than lateral space, the shock absorber can be positioned without creating offset mounting conditions that would generate bending moments.
2Reliability
If shock absorbers are attached to the cylinder main body or reciprocating table, then impact force can be absorbed, but additional fixing jigs and space are required
Solution Approach 1:
The shock absorber is merged with the reciprocating rod itself, which serves as both the actuator and the mounting structure. The attaching hole in the reciprocating rod directly receives the shock absorber, eliminating the need for separate fixing brackets or mounting plates.
Solution Approach 2:
The reciprocating rod serves its own mounting function by providing an attaching hole that directly accepts the shock absorber. The rod's own structure is utilized to provide the mounting interface, eliminating the need for external fixing devices.
3Reliability
If a stopper is attached to the reciprocating rod to collide with the shock absorber, then impact absorption is achieved, but the apparatus size increases
Solution Approach 1:
The stopper function is extracted from a separate component and integrated into the shock absorber assembly itself. The shock absorber's rod and housing structure serve as the collision interface, eliminating the need for a separate stopper component.
Solution Approach 2:
The shock absorber assembly serves multiple functions: it provides impact absorption, acts as the collision interface (replacing the stopper), and serves as the mounting structure. This multi-functionality reduces the total number of components and apparatus size.
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 the structural requirements of the reciprocating unit, minimizes space usage, and lowers manufacturing costs by directly attaching the shock absorber to the reciprocating rod, while effectively absorbing impact forces without bending moments.
Implementation Method 1
applying a resistance force to a flow of the liquid from the first liquid chamber to the second liquid chamber at a time of an impact-force absorption movement of the hollow rod to the outer cylindrical body
Implementation Method 2
a restoring means provided in the first liquid chamber and returning the hollow rod to an original position located before an impact-force absorption
Data Source
AI summary
A shock absorber is attached coaxially with a reciprocating rod driven by a reciprocating unit to prevent a bending moment from being applied to the reciprocating rod in absorbing an impact force. The shock absorber has a hollow rod and an outer cylindrical body mounted axially movably relatively to and outside the hollow rod. An accommodating space is formed between the hollow rod and the outer cylindrical body. A spring force in a direction of being relatively directed to one end portion side of the hollow rod is applied by a compression spring to the outer cylindrical body. The hollow rod is provided with an annular piston which partitions the accommodating space into two liquid chambers. When an impact force in a direction of being relatively directed to the other end side of the hollow rod is applied to the outer cylindrical body, liquid flows from one of the liquid chambers to the other through a gap, so that a resistance force is applied to the annular piston.