Rotary Damper Volume Compensation Without a Gas Chamber
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Solution Overview
Problem
The existing temperature compensation mechanisms in rotary dampers for self-propelled vehicles and industrial equipment are complex and burdensome to manufacture, requiring precise airtight sealing of gas chambers to compensate for hydraulic fluid volume changes due to temperature variations.
Innovation Solution
A volume change compensation device using a tubular body, inner cylinder piston, and inner cylinder inner small piston with elastic components to compensate for hydraulic fluid volume changes using only the hydraulic fluid, eliminating the need for gas chambers and simplifying the configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If gas chamber is used for volume compensation, then volume change compensation is achieved, but device complexity increases
Solution Approach 1:
The invention extracts the gas chamber from the system and replaces it with a piston-cylinder mechanism filled with hydraulic fluid. The volume compensation function is achieved through the piston's movement within the cylinder, eliminating the need for gas sealing structures while maintaining the compensation capability.
Solution Approach 2:
The invention uses hydraulic pressure transmitted through the piston to achieve volume compensation. When the container volume changes, the piston moves within the cylinder, and hydraulic fluid pressure transmits the force to compensate for volume changes, replacing the gas-based compensation mechanism.
2Reliability
If gas chamber with airtight sealing is used, then volume change compensation is achieved, but manufacturing burden increases
Solution Approach 1:
The invention removes the gas chamber and its associated airtight sealing requirements from the system. The piston-cylinder assembly uses standard mechanical seals that are easier to manufacture and assemble, eliminating the need for precise airtight sealing of gas-containing chambers.
Solution Approach 2:
The invention uses a simpler piston-cylinder mechanism with standard hydraulic components that are easier to manufacture and replace if needed. The design accepts that the piston may need replacement over time but simplifies the overall manufacturing process and component availability.
3Reliability
If gas chamber structure is implemented, then volume compensation is achieved, but manufacturing precision requirements increase
Solution Approach 1:
The invention uses hydraulic fluid pressure within the piston-cylinder assembly to achieve volume compensation. The hydraulic system naturally compensates for minor manufacturing tolerances through fluid pressure distribution, eliminating the need for extremely precise sealing surfaces required by gas chambers.
Solution Approach 2:
The invention changes the compensation mechanism from gas pressure to hydraulic pressure. This parameter change allows the use of standard manufacturing tolerances for the piston and cylinder surfaces, as hydraulic seals can accommodate larger tolerances compared to gas sealing requirements.
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
The solution effectively reduces manufacturing complexity and cost by using hydraulic fluid to compensate for volume changes within the device, ensuring reliable fluid charging and preventing air retention, while maintaining efficient operation and compact design.
Implementation Method 1
an inner cylinder piston pressing elastic body provided on an opposite side of the inner cylinder piston from a side of the one opening in the body tube and elastically pressing the inner cylinder piston toward the one opening side
Implementation Method 2
a small piston pressing elastic body provided in the inner cylinder piston and elastically pressing the inner cylinder inner small piston to a bottom portion side
Implementation Method 3
compensate for a change in the volume of the hydraulic fluid due to a temperature change
Data Source
AI summary
Provided are a volume change compensation device capable of reducing a manufacturing burden with a simple configuration and a damper device including the volume change compensation device. A damper device 100 includes a rotary damper, and includes a volume change compensation device 140 in a shaft 121 of a rotor 120. The volume change compensation device 140 includes an inner cylinder piston 142 pressed by an inner cylinder piston pressing elastic body 145 in a body tube 141 communicating with a hydraulic fluid housing portion 103 of the damper device 100 through a connection path 141a. The inner cylinder piston 142 is formed in a bottomed cylindrical shape opening on a connection path 141a side. In the inner cylinder piston 142, an inner cylinder inner small piston 143 is pressed against a bottom portion 142b by a small piston pressing elastic body 144. An air hole 142c is formed at the bottom portion 142b of the inner cylinder piston 142. The inner cylinder inner small piston 143 slides in the inner cylinder piston 142 according to the amount of hydraulic fluid 150 in the inner cylinder piston 142.