Helical involute gear and processing method thereof

An involute gear and involute technology, applied in the field of mechanical parts, can solve the problems of poor processing versatility, high cost, and difficult processing of intersecting shaft transmission gears.

Inactive Publication Date: 2009-09-09
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to design a spiral involute gear and provide a processing method for this type of gear, aiming at the problems of high difficulty in processing, high cost and poor processing versatility of the current intersecting shaft transmission gear

Method used

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  • Helical involute gear and processing method thereof
  • Helical involute gear and processing method thereof
  • Helical involute gear and processing method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0065] Such as figure 1 , 13 , 18 shown.

[0066] A spiral involute gear, no matter what kind of transmission pair it is used in, its tooth surface profile adopts a spiral involute; the spiral involute is the involute base circle in the process of generating the involute At the same time, the space curve is generated by uniform linear motion along the axis of the base circle and uniform rotation around the axis of the base circle. The cylindrical coordinate parameter equation of the spiral involute is:

[0067] ρ = R 0 cos α

[0068] Z=k·R 0 ·tgα

[0069] ψ=k·c·tgα+tgα-α

[0070] In the formula,

[0071] ρ—cylindrical coordinate radial vector,

[0072] R 0 ——involute base circle radius,

[0073] ψ——cylindrical coordinate angle vector,

[0074] Z——cylindrical coordinate axial vector,

[0075] α—parametric equation parameter, involute pressure a...

Embodiment 2

[0079] Such as Figure 1-3 shown.

[0080] A helical involute gear that can be used in vertical intersecting shaft transmission pairs, and it can also be used in general intersecting shaft transmission pairs. The characteristic of this gear is that its tooth surface profile is a spiral involute. The said spiral involute is a spiral involute that is tangent to the pitch circle, intersects the axes of the base circle to form an angle λ, and satisfies the condition of intermeshing; these two spiral involutes each have two base cylinder tangent planes that pass through the nodes ,Such as Figure 18 As shown, the corresponding tangent plane forms two symmetrical intersection lines on the left and right, and these two intersection lines are the meshing point motion lines of the two spiral involutes, as shown in Figure 13 The slash CE in 0 , which is also their meshing common normal; the radii of the two base circles of the two helical involutes, the pressure angle α of the pitc...

Embodiment 3

[0084] A processing method for a cylindrical helical involute gear, which should first manufacture a special hob with only a half-side tooth shape that matches the pressure angle of the gear as a cylindrical helical gear, and can hob and cut two Side tooth surface; with a dish-shaped grinding wheel, both sides of the tooth surface can be ground separately on an ordinary gear grinding machine.

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Abstract

The invention relates to a helical involute gear and a processing method thereof. The helical involute gear is characterized in that a tooth surface molded line is a helical involute which is a curve spread by a rack type line straightly moving along the pitch circle tangent line and pure-rolling with a gear pitch circle. The helical involute gear has clear and easy drive principle, can ensure the drive continuity and the drive uniformity, and can realize surface meshing with large meshing area so that the bearing capacity is strong; the helical involute gear has long meshing line and large superposition coefficient, especially, an inclined helical involute conical gear is easy to implement speed reduction at high speed ratio. The helical involute conical gear can realize the expansion processing, thereby having high processing accuracy, low processing cost and high processing tooth surface hardness, improving the motion stability of the gear and the bearing capacity, and prolonging the service life. Meanwhile, processing equipment required by the helical involute gear can be conveniently processed by utilizing the method, thereby solving the difficulties of large processing difficulty and high cost of a gear drive pair with intersecting axes.

Description

technical field [0001] The invention relates to a mechanical part, especially a gear with a new type of tooth profile that can be used for intersecting shaft transmission, can be generated and processed, and has a uniform meshing speed, specifically a spiral involute gear and its processing method. Background technique [0002] As we all know, the principle of the uniformity of involute gear transmission speed is based on the fact that the speed of the meshing point moving along the common normal of the involute is uniform on the common normal (usually 20° pressure angle). This is no problem for parallel shaft spur gear drives. For bevel gear transmission with intersecting shafts, only spherical involute can satisfy the principle of uniformity of involute gear transmission speed. But the processing quality of the spherical involute is difficult to guarantee, so the uniformity of the transmission speed is poor, and the transmission noise is relatively large. For the bevel ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16H55/17F16H55/08B23F5/20B23F5/02
Inventor 黄因慧田宗军刘志东沈理达王桂峰汪炜
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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