Civil Helicopter Dry Running Transmission System
A transmission system and dry-running technology, which is applied in the field of civil helicopter transmission system, can solve the problems of reducing heat source optimization, and there is no better way to improve, so as to achieve stable and reliable gear transmission, reduce mutual motion, and avoid gear undercutting.
Active Publication Date: 2015-09-09
SHANGHAI JIAO TONG UNIV
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Problems solved by technology
Although there are some actual tests on the combination of these three technologies, and the test results also show the ability to run dry for 30 minutes, there is no better way for further improvement, and there is no optimization from the fundamental problem of reducing heat sources.
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specific Embodiment approach
[0023] Then optimize the design from the angle of geometric tooth profile modification, analyze the sliding rate of the involute tooth profile according to the principle of gear meshing and tribology, get the place where the tooth profile is most prone to wear, and then select the meshing track as a circular arc The curve (equal slip rate curve) replaces the tooth profile here, and the connection of the curve is smoothly connected according to the principle of differential geometry, so that the meshing here can be stable and the vibration can be reduced. The specific implementation is as follows:
[0024] The tooth profile of the planetary gear before modification is involute shape, and the tooth profile 1 equation is:
[0025] x 1 = r b 1 sin πt ...
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The invention discloses a civil helicopter transmission system which can run for a long time under dry running condition. The civil helicopter transmission system comprises a two-stage planetary gear reducer, a bevel gear reversing device, a clutch, a braking device and a lubrication system. Gear parameters of tooth number, modification coefficient, modulus and the like of a planetary gear system are optimized. A small sliding rate curve is used for profiling an involute profile. An auxiliary lubrication system is designed to enable the system to be started rapidly under dry running, and components and proportion of lubrication oil are optimized. A high-temperature-resistant anti-abrasive material is selected, plasma spraying treatment is performed on the surface of the tooth profile by selecting nanometer materials, surface quality is improved, an anti-abrasive material and a heat conduction material are increased on the end face of a gear, and a damping design is arranged in the structural design. The civil helicopter transmission system reduces heat amount during operation, improves anti-abrasive performance and heat-resisting performance of a gear surface, and can run at least 30 minutes under dry running condition.
Description
technical field [0001] The invention relates to a civil helicopter transmission system, in particular to a civil helicopter transmission system suitable for dry operation. Background technique [0002] During the flight of the helicopter, due to unexpected reasons such as the transmission system being attacked, the pump failing to supply oil or oil leakage, etc., the transmission system will be in a working state that cannot be fully lubricated or has no lubricating oil in a short period of time, so the transmission system will quickly enter dry running condition. As the most important core part in the transmission system, the gear directly carries the input and output of the helicopter rotor power. The working condition is also the most severe in the transmission system, and it is a vulnerable part in the transmission system. Run related research. Due to the sharp rise in temperature, the comprehensive performance of the gear material will continue to decline, which may c...
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IPC IPC(8): F16H57/02F16H57/04F16H55/17F16H55/06B64D35/00B64C27/12
Inventor 殷跃红孙立剑黄文俊吴文敏焦瑶徐文超陆建
Owner SHANGHAI JIAO TONG UNIV