Vehicle Reverse Drive Mechanism Friction Damper Heat Wear
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Solution Overview
Problem
The existing reverse drive mechanisms for vehicles suffer from heat generation and wear issues due to large relative rotational speed differences between the reverse drive gear and the friction damper, leading to reduced heat resistance characteristics and durability.
Innovation Solution
Introducing a friction damper between the reverse drive gear and a fixed, non-rotational case, which significantly reduces the relative rotational speed difference, thereby minimizing heat generation and wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the friction damper is interposed between the reverse drive gear and the reverse drive exclusive use shaft, then the backlash reducing torque is applied to prevent vibrations and abnormal noise, but the large relative rotational speed difference causes heat generation and wear
Solution Approach 1:
The patent introduces a case as an intermediary element between the reverse drive gear and the friction damper. The case rotates at a speed closer to the reverse drive gear, reducing the relative rotational speed difference. This intermediary structure allows the friction damper to function effectively while minimizing heat generation and wear caused by excessive speed differential.
Solution Approach 2:
The patent changes the rotational speed parameter of the friction damper by mounting it on the case rather than directly on the reverse drive exclusive use shaft. This parameter change reduces the relative rotational speed difference from extremely large values to a manageable level, thereby reducing heat generation and improving durability.
2Reliability
If the friction damper is interposed between the reverse drive gear and the reverse drive exclusive use shaft, then the backlash reducing torque is applied to prevent vibrations and abnormal noise, but the extremely large relative rotational speed difference leads to wear and reduced heat resistance characteristics
Solution Approach 1:
The case serves as a mediator that reduces the harmful effect of large relative rotational speed difference. By mounting the friction damper on the case instead of the reverse drive exclusive use shaft, the relative speed difference is reduced, which directly reduces wear and improves heat resistance characteristics.
Solution Approach 2:
The patent converts the potentially harmful large speed differential into a beneficial configuration where the case's rotation speed acts as an intermediate value. This transformation reduces wear and heat generation while maintaining the backlash reduction function.
3Ease of operation
If the reverse drive gear is always in geared engagement with the input shaft, then the reverse drive mechanism can function, but the idling rotation of the reverse drive gear causes vibrations and tooth hammering noise due to backlash
Solution Approach 1:
The patent uses the friction damper to generate controlled frictional forces that counteract the harmful vibrations and tooth hammering noise. The friction damper creates a damping effect that reduces the amplitude of unwanted vibrations while maintaining the geared engagement necessary for operation.
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 configuration enhances the heat resistance characteristics and durability of the friction damper by reducing the relative rotational speed difference to 2000 rpm, effectively suppressing heat generation and wear, thus improving overall performance.
Implementation Method 1
a friction damper which applies a backlash reducing torque to the reverse drive gear
Data Source
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AI summary
The reverse drive mechanism includes a case, drive wheels to which a driving force is transmitted from a driving force source through a transmission, a reverse drive gear which is rotatably connected to an input shaft of the transmission, a reverse drive exclusive use shaft rotatably connected to the drive wheels for supporting the reverse drive gear allowing a relative rotation therewith, when the transmission is in a forward drive speed stage and is connected to the reverse drive gear through a reverse drive establishing mechanism when the transmission is in a reverse drive stage and a friction damper interposed between the reverse drive gear and the case for applying a backlash reducing torque to the reverse drive gear.