JP2001162452A - Gear and method of manufacturing the gear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the amount of deformation by forming a finite angle gear by machining a heat-treated circular gear. SOLUTION: This method of manufacturing a gear comprises the steps of performing heat treatment in the state of a circular gear 1 and machining the circular gear 1 so as to provided a finite angle gear 3. Thus, the amount of deformation of each teeth of the finite angle gear 3 can be reduced more than that of the conventional gears.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a gear and a gear, and more particularly to a novel improvement for eliminating the influence of distortion due to heat treatment when processing a circular gear into a finite angle gear.

[0002]

2. Description of the Related Art Conventionally, as a method of manufacturing this kind of gear, a circular gear is generally processed into a predetermined finite angle gear by wire cutting or the like, and then heat treatment such as carburizing and quenching is performed. Had to be obtained.

[0003]

The conventional method for manufacturing a gear has the following problems because it has been configured as described above. In other words, since heat treatment is performed after processing a circular gear into a finite angle gear, heat treatment of the finite angle gear causes distortion, and the distortion loses the dimensions secured before heat treatment, and the gear accuracy falls within the standard. It was difficult to fit.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and in particular, a gear manufacturing method for removing the influence of distortion due to heat treatment when processing a circular gear into a finite angle gear. And gears.

[0005]

A method of manufacturing a gear according to the present invention is a method of manufacturing a gear in which a circular gear is processed into a finite angle gear of 360 ° or less. Thereafter, the circular gear is processed to obtain the finite angle gear, and the finite angle gear is a sector gear, and the gear according to the present invention is such that the circular gear has a finite angle of 360 ° or less. In a gear processed into a gear, heat treatment is performed in the state of the circular gear.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a gear manufacturing method and a gear according to the present invention will be described below with reference to the drawings. FIGS. 1 to 4 are a plan view and a cross-sectional view when a circular gear is processed into a finite angle gear. FIG.
Is a circular gear having an overall shape of a circle and having a shaft hole 2 at the center thereof.
2 is shown in FIG. The circular gear 1 is cut by wire cutting or the like, and the finite angle gear 3 having an angle range of 360 ° or less is as shown in FIG. 3, and is constituted by a sector gear having a sector shape as a whole. The cross section of the finite angle gear 3 is as shown in the figure.

The circular gear 1 is obtained by subjecting the circular gear 1 to heat treatment such as carburizing and quenching by a heat treatment device (not shown) and then processing the circular gear 1 into a finite angular gear 3 by wire cutting or the like, as shown in FIG. This finite angle gear 3
With respect to the three measurement positions A, B, and C of the gear, strain measurement after heat treatment and strain measurement after wire cutting were performed.
As a result, the measured data after heat treatment (shown in FIGS. 6 and 7) and the measured data after wire cutting (shown in FIGS. 6 and 7) were compared with the measured data shown in FIGS. As shown in the present invention, it has been found that the strain at each of the measurement positions A, B, and C of the finite angular gear 3 obtained by performing the wire cutting after the heat treatment is significantly reduced as in the present invention.

[0008]

Since the gear manufacturing method and the gear according to the present invention are configured as described above, the following effects can be obtained. That is, since the circular gear is heat-processed into a finite angle gear after heat treatment, the strain amount of each part of the finite angle gear can be significantly reduced as compared with a conventional method of performing heat treatment after wire cutting, High quality finite angle gear can be obtained.

[Brief description of the drawings]

FIG. 1 is a front view showing a circular gear according to the present invention.

FIG. 2 is a sectional view of FIG.

FIG. 3 is a front view showing a finite angle gear obtained by processing the circular gear of FIG. 1;

FIG. 4 is a sectional view of FIG. 3;

FIG. 5 is a front view showing a distortion measurement position of the finite angle gear of FIG. 3;

FIG. 6 is a characteristic diagram showing the amount of strain after heat treatment and after wire cutting according to the present invention.

FIG. 7 is a characteristic diagram showing the amount of distortion corresponding to FIG. 6 by numerical values.

FIG. 8 is a front view showing a distortion measurement position of a conventional finite angle gear.

FIG. 9 is a characteristic diagram showing the amount of strain after a conventional wire cut and after a heat treatment.

FIG. 10 is a characteristic diagram showing numerical values of distortion amounts corresponding to FIG. 9;

[Explanation of symbols]

 1 circular gear 3 finite angle gear

Claims (3)

[Claims] 1. A method of manufacturing a gear in which a circular gear (1) is processed into a finite angle gear (3) of 360 ° or less,
A method for manufacturing a gear, comprising: performing a heat treatment in the state of the circular gear (1); and thereafter, processing the circular gear (1) to obtain the finite angle gear (3). 2. The method according to claim 1, wherein the finite angle gear is a sector gear. 3. A gear obtained by processing a circular gear (1) into a finite angle gear (3) of 360 ° or less, wherein the gear is characterized in that heat treatment is performed in the state of the circular gear (1). .