Gear with large tooth lead modification quantity and processing method thereof

Abstract

The invention discloses a gear with large tooth lead modification quantity and a processing method thereof. the modification coefficient of a tooth shape of the upper end face of the gear with large tooth lead modification quantity is x, and the common normal line of the tooth shape of the upper end face is W; the modification coefficient of the tooth shape of the section at a position, spaced from the upper end face by a, on the gear with the large tooth lead modification quantity is xa, and the common normal line of the tooth shape of the section at the position, spaced from the upper end face by a, on the gear with the large tooth lead modification quantity is Wa; the intersecting line of the left tooth surface and the cylindrical surface of the reference circle is a molded line AD, and the intersecting line of the right tooth surface and the cylindrical surface of the reference circle is a molded line BE; an intersection between the molded line AD and the upper end face X is a point A, and an intersection between the molded line AD and the lower end face V is a point D; an intersection between the molded line BE and the upper end face X is a point B, and an intersection between the molded line BE and the lower end face V is a point E; a point F is a projection of the point A on the lower end face V in the axial direction U; a point G is a projection of the point B on the lower end face V in the axial direction U. The processing method comprises a step of 1, performing hobbing processing on a gear blank, and further comprises a second step and a third step. According to the processing method, the tooth direction grinding modification quantity can be reduced, and the defects, such as reduction of the hardness of the tooth surface, caused by a large tooth grinding amount are avoided.

Description

technical field [0001] The invention relates to a gear and a processing method thereof, and is especially suitable for a cantilever-mounted involute cylindrical gear with a hard tooth surface and a large tooth direction modification amount with a large tooth surface meshing misalignment. Background technique [0002] The traction gears of railway locomotives and construction machinery often use active gear cantilever-installed meshing transmissions. This structure is simple and reliable. It is bound to increase the modification amount of the gear. The traditional design and processing method is to first design the basic tooth surface with constant displacement coefficient and common normal, and then carry out the design of the tooth profile modification. The basic tooth surface is realized by hobbing during processing, and the tooth profile modification is realized by grinding after heat treatment. The excessive amount of modification increases the grinding amount of the to...

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Problems solved by technology

[0002] The traction gears of railway locomotives and engineering machinery often use active gears for cantilever-mounted meshing transmission. This structure is simple and reliable. It is bound to increase the amount of gear modification

The traditional design and processing method is to first design the basic tooth surface with constant displacement coefficient and common normal line, and then carry out the design of the tooth profile modification. The basic tooth surface is realized by hobbing during processing, and the tooth profile modification is realized by grinding after heat treatment. The excessive amount of modification increases the grinding amount of the tooth surface, and the negative impact is that the hardness of the tooth surface is reduced, and the depth of the grinding boss and the tooth surface is not enough. These are recognized in the industry to reduce the strength and life of the gear. the main risk factors

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