Curved teeth cylindrical gear, machining method and apparatus thereof

Abstract

A cylindrical gear with arch portion and involute or arch profile of teeth is machined by tool bits in revolving movement by expansion process with fixed normal direction of working conference surface. This invention relates to a method and an apparatus for said cylindrical gears. The said gears engage steadily with large engaging areas, high bearing ability and less noise and can be used in various transmission systems, especially in high speed, heavy load or low noise ones.

Description

technical field [0001] The invention relates to a gear, a processing method and a processing device thereof, and belongs to the technical field of gears. Background technique [0002] Theoretically, the spiral tooth cylindrical gear transmission has the characteristics of smooth meshing, low noise, and strong bearing capacity, and has long been concerned. Spiral gears with equal tooth thickness, such as the spur gear and its processing method disclosed in the patent document ZL90105655.3, the tooth line is a part of the arc, and the tooth profile is an involute or arc. When the cylindrical gear is cut by the blade fixed on the rotating disk, the blade rotates around the axis of the rotating disk, and the straight arc gear or oblique arc gear can be processed by the distance between the center of rotation of the blade and the middle section of the cylindrical gear. ; During processing, the normal direction of the working base surface of the blade is constantly changing with ...

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Problems solved by technology

[0002] Theoretically, the spiral tooth cylindrical gear transmission has the characteristics of smooth meshing, low noise, and strong bearing capacity, and has long been concerned. Spiral gears with equal tooth thickness, such as the spur gear and its processing method disclosed in the patent document ZL90105655.3, the tooth line is a part of the arc, and the tooth profile is an involute or arc. When the cylindrical gear is cut by the blade fixed on the rotating disk, the blade rotates around the axis of the rotating disk, and the straight arc gear or oblique arc gear can be processed by the distance between the center of rotation of the blade and the middle section of the cylindrical gear. ; During processing, the normal direction of the working base surface of the blade is constantly changing with the rotation of the rotating disk. The spiral tooth cylindrical gear processed by this method has the same tooth groove width in the normal direction of the tooth line arc, that is The normal groove width of the gear is equal, but the circumferential groove width of the gear is not equal, so the tooth thickness in the circumferential direction of the gear is not equal

For spur gears, the circumferential tooth thickness of the gear edge is smaller than the circumferential tooth thickness of the middle of the gear, and the greater the circumferential angle contained in the tooth line arc, the more obvious this inequality is. When processing by generating method, It will even lead to the loss of both sides of the arc teeth, which will affect the strength of the gear; at the same time, this inequality will cause the gear to break easily during transmission, the meshing of the gear pair will be unstable, and the load-carrying capacity will be poor; at present, there is no such thing as a circumferentially equal tooth thickness. The record of spiral tooth cylindrical gear and its processing method; the existing processing method cannot process the spiral tooth cylindrical gear with equal circumferential tooth thickness, so the current spiral tooth cylindrical gear is rarely used

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