Damper Torque Limiter Separator Design
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Solution Overview
Problem
Existing dampers in vehicles face challenges in easy assembly without deformation, stabilization of critical torque due to varying friction coefficients, and inadequate alleviation of large impact torque, leading to increased mechanism sizes and potential damage.
Innovation Solution
A damper design with a housing containing a liquid accommodation chamber, a damper device, and a limiter mechanism, featuring a separation restriction member to prevent relative movement of covers and a hysteresis mechanism to absorb torque fluctuations, ensuring stable critical torque and efficient impact torque alleviation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a limiter mechanism with a disc spring is used to block excessive torque, then torque limitation function is achieved, but the biasing force causes relative movement between covers leading to assembly difficulty and potential deformation
Solution Approach 1:
The patent applies preliminary action by pre-positioning the separator between the disc spring and the second plate before assembly. This preliminary placement ensures that the separator is already in its functional position to restrict cover movement, eliminating the need for complex assembly procedures and preventing deformation during the assembly process while maintaining the torque limitation function.
Solution Approach 2:
The separator acts as an intermediary element between the disc spring and the second plate. It mediates the interaction by receiving the biasing force from the disc spring and transmitting it to the second plate, while its rigid structure prevents relative movement between the covers. This intermediary component solves the contradiction by enabling the torque limitation function without causing assembly difficulties.
2Reliability
If friction members are used in the limiter mechanism, then torque blocking is achieved, but varying friction coefficients cause unstable critical torque
Solution Approach 1:
The patent applies pneumatics and hydraulics by immersing the friction members in lubricant oil. This fluid environment ensures consistent lubrication and stable friction coefficients, which in turn stabilizes the critical torque. The lubricant oil creates a controlled hydraulic-like environment that eliminates the variability caused by dry friction, maintaining reliable torque blocking while ensuring critical torque stability.
3Reliability
If the damper structure is enlarged to handle large impact torque, then impact torque alleviation is improved, but the mechanism size increases
Solution Approach 1:
The patent applies dynamics by making the separator's axial position variable rather than fixed. The separator can dynamically adjust its position along the axial direction based on the applied load, allowing the structure to adapt to different torque conditions. This dynamic capability enables the compact structure to handle large impact torques effectively without requiring an enlarged mechanism, as the separator moves to accommodate the varying forces.
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
Facilitates easy assembly by preventing cover deformation and maintaining consistent friction coefficients, allowing for reduced mechanism sizes and effective absorption of both small and large impact torques.
Implementation Method 1
frictional force is generated between the friction member and the limiter plate and between the friction member and the front cover
Implementation Method 2
The torque absorber 312 has a damper spring 311 serving as an elastic member that is elastic in the circumferential direction
Implementation Method 3
The outer case 303 is filled with lubricant oil serving as a liquid
Implementation Method 4
the separator 123 restricts relative movement between the front cover 21 and the rear cover 22 in a direction in which the front cover 21 and the rear cover 22 are separated from each other by the biasing force of the limiter disc spring 103
Data Source
AI summary
A damper includes an outer cover having a front cover and a rear cover. The covers are joined to form a lubricant oil accommodation chamber for accommodating liquid. A damper device, a limiter mechanism, a first plate including a first collar portion located toward the front of the limiter mechanism, and a second plate including a second collar portion located toward the rear of the limiter mechanism are arranged in the outer cover. The limiter mechanism includes a first limiter plate, which is an input side on the torque transmission path, a second limiter plate, which is an output side on the torque transmission path, and a limiter disc spring, which presses the limiter plates.