JPS59115120A - Gear burnishing method - Google Patents

Abstract

PURPOSE:To efficiently burnish the stepped part of a gear without need for using a highly accurate die by providing an equipment having an intermeshing device of gears without requiring any expensive rolling machine. CONSTITUTION:A gear 11, in which the stepped parts 10 are gear cut, is mounted on the mandrel 6 of a gear intermeshing device 1. The mandrel 6, on which a workpiece 12, or the gear 11 is mounted, is provided between a rotary shaft 2 and a center retainer 3 and centered, and a work carry 9a is engaged with the engaging part (not shown in figure) of a plate 4. And, the tooth part 16 of a master gear 9 is brought in contact with the stepped part 10 of the workpiece 12 and a load of about 3 ton is applied. Then, the shaft 2 is rotated, the workpiece 12 is rotated, and the stepped part 10 is burnished through the tooth part 16 of a master gear 9.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for burnishing gears using a gear shaving machine or the like.

In transmission parts for motor graders, a step is added to the meshing gear α during shifting to prevent the gear from slipping out (see Figures 1 and 2).

Gear α with this step is generally created by rolling on a rolling machine, but since rolling machine equipment is a special machine and is relatively mass production equipment, although it depends on the quantity, it is not suitable for high-variety, low-volume production. It was unsuitable, had a low operating rate, and had high tool costs.

The present invention has been made in view of the above circumstances, and its purpose is to suffice as long as there is functional equipment that has a gear meshing device without using expensive equipment (privately produced machines). It is an object of the present invention to provide a gear burnishing method that allows you to burnish a stepped portion of a gear using a high-precision die.

Hereinafter, the present invention will be explained with reference to FIG. 3 and subsequent figures.

In the drawing, 1 is a gear meshing device like a shaving machine, and this gear meshing device 1 is equipped with a rotating shaft 2 and a center presser 3, and a plate 4 is fixed to the rotating shaft 2. A retaining portion 5 is formed on the plate 4.

6 is a mandrel, and the mandrel 6 is provided with a receiving plate 7 and a holding plate 8.
is the installation. 9 in the drawing is a master gear.

Then, the workpiece 12, which is a gear 11 with a stepped portion 10 formed by gear cutting, is attached to the mandrel 6. This mounting is carried out by sandwiching the workpiece 12 between the receiving plate 7 and the holding plate 8 via spacers 13 and 14, and screwing the nut 16 into the threaded portion 15 of the mandrel 6.

The mandrel 6 with the workpiece 12 mounted thereon is installed between the rotating shaft 2 and the center presser 3, and the center is brought out.
α is engaged with the retaining portion 5 of the plate 4. Then, the teeth 16 of the master gear 9 are applied to the stepped portion 10 of the workpiece 12 to apply a load of about 3 tons.

Next, the rotary shaft 2 is rotated to rotate the workpiece 12, and the stepped portion 1o is burnished using the teeth 16 of the master gear 9.

A comparison of the resulting dimensional accuracy with rolled products is shown in Table 1, and processing time is shown in Table 2.

Table 1 Table 2 (Note 1) The cutting depth marked with * is the value on the machine handle scale that is cut from the state where the master gear is engaged and there is no pack lash.

(Note 2) The depth of cut and time were determined by taking into consideration the capacity of the equipment, the capacity of the fixture, the surface pressure of the gear to be burnished, etc.

From the above experimental results, the static accuracy of gear 11 is JIS
Grade 7 is obtained and the function of the part is fully satisfactory, and high capacity (forming pressure) equipment is not required, and about 3 tons can be formed in an operating time of about 13 to 15 minutes.

As described in detail above, the present invention involves mounting the gear 11 with the stepped portion 10 cut on the mandrel 6 of the gear meshing device 1, and inserting the teeth 16 of the master gear 9 into the stepped portion 10 of the gear 11 in a predetermined manner. This is a gear burnishing method characterized by applying a load to mesh and rotating the gear 11.

Therefore, the gear burnishing method according to the present invention can be achieved economically without the need for expensive equipment (rolling machine) as long as there is functional equipment that has a gear meshing device, and it is also economically superior. As it is expensive, there is no need to use high-precision dice, making it cheaper.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of the meshing of a gear, which is a workpiece, with another gear, Fig. 2 is a perspective view of the gear teeth, which is a workpiece, and Fig. 3 is a perspective view of the gear teeth, which is a workpiece.
The figure is an explanatory diagram of the configuration of the main parts of the gear meshing device used in the method of the present invention, FIG. 4 is a view taken from the arrow direction of FIG.
Figure 6 is an enlarged view of the section ■ in Figure 3, Figure 7 is an explanatory diagram of the burnishing part of the gear, and Figures 8 to 10 are illustrations of the dimensional accuracy of the workpiece. FIG. 1 is a gear meshing device, 6 is a mandrel, 9 is a master gear,
10 is a stepped portion, and 11 is a gear. Applicant Komatsu Machinery Co., Ltd. Komatsu Machinery Co., Ltd. Representative Patent Attorney Masaaki Yonehara Patent Attorney Tadashi Hamamoto

Claims (1)

[Claims] The gear II having the stepped portion 10 is connected to the gear meshing device 1.
is attached to the mandrel 6 of the gear 11, and the teeth 16 of the master gear 9 are engaged with the stepped portion 10 of the gear 11 by applying a predetermined load.
A gear burnishing method characterized in that the gear 11 is rotated.