Double-Acting Cylinder Piston Unit for Impact Damping
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Solution Overview
Problem
Existing switching modules for differential locks and gear shifts suffer from damage due to hard accelerations and impacts during differential speed changes, leading to loss of function.
Innovation Solution
A switching module with a double-acting cylinder-piston unit, incorporating an elastic restoring element and damping pressure to absorb and dampen these impacts, ensuring the engagement and disengagement processes are primarily driven by the restoring force while damping pressure supports and protects the module from damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single-acting cylinder-piston unit is used with a restoring element, then the engagement process is simple and cost-effective, but hard blows and impacts occur during differential speed changes causing damage to circuit parts
Solution Approach 1:
The single-acting cylinder-piston unit is segmented into a double-acting cylinder-piston unit with separate working chambers. The first working chamber receives engagement pressure to drive engagement, while the second working chamber receives damping pressure to counteract impacts. This segmentation allows independent control of engagement and damping functions, resolving the contradiction between structural simplicity and damage resistance.
Solution Approach 2:
The damping pressure in the second working chamber is applied beforehand to counteract expected impacts from differential speed changes. This prior cushioning prevents hard blows to circuit parts during operation, improving reliability while maintaining a relatively simple double-acting cylinder structure.
2Reliability
If damping pressure is applied to support the engagement process, then engagement reliability is improved, but the device complexity increases due to the double-acting cylinder-piston unit
Solution Approach 1:
The double-acting cylinder-piston unit is designed to perform multiple functions: the first working chamber handles engagement pressure while the second working chamber provides damping pressure. This multi-functionality allows a single device to simultaneously improve engagement reliability and protect against impacts, justifying the increased structural complexity through enhanced operational reliability.
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 module effectively reduces the risk of damage by absorbing shocks and accelerations, ensuring reliable operation and extended service life, even under high loads, through the use of a double-acting cylinder-piston unit with a damping chamber and a robust design.
Implementation Method 1
a switching module (20) for a differential lock, for a gear shift or for an axle engagement, comprising an elastic restoring element (24) and a cylinder-piston unit (30), the restoring element (24) acting on the cylinder-piston unit (30) with a restoring force
Implementation Method 2
The double action of the cylinder-piston unit initially results in the advantage that the accelerations of the circuit parts described above and the resulting impact of the circuit parts can be dampened by filling a chamber of the cylinder-piston unit with a damping pressure
Data Source
Figure 1
Figure 2a
Figure 2b
AI summary
The utility model relates to a shift module, transfer case, derailleur and shaft coupling mechanism, does the module of shifting include elastic return component (24) and cylinder body piston unit (30), wherein are return component (24) to the cylinder body return force is applyed in piston unit (30). According to the utility model discloses a characterized in that of gear shift module (20), the cylinder body is piston unit (30) structure double -acting's cylinder body piston unit (30). In addition the utility model discloses still relate to a corresponding transfer case, a corresponding derailleur and a corresponding shaft coupling mechanism.