JP2950383B2 - Manufacturing method of receiving jig for gear processing - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates relates to the manufacture how the accepted jig when processing rear or shaft hole, such as bevel gears.

[0002]

2. Description of the Related Art A differential device (differential device) for an automobile is provided with a pinion shaft in a case, an axle inserted from right and left so as to be orthogonal to the pinion shaft, and a differential side gear fixed to an end of the axle. The structure is such that a pinion gear fixed to the pinion shaft meshes with the inside of the case.

[0003] The gears such as the differential side gear and the pinion gear are designed such that the back surface, the shaft insertion hole and the end surface thereof are lace-processed based on a tooth portion formed by forging or the like so as to be finished to predetermined dimensions.

[0004] Specifically, as shown in FIG.
The tooth portion 101 is fitted to the receiving tooth portion 103 of the jig 102, fixed by the clamper 104, and the back surface and the like are finished with a cutting tool 105 or the like.

[0005]

The receiving jig 10 described above.
The second receiving tooth portion 103 is manufactured by grinding with Kometan in accordance with the tooth portion 101 of the gear 100. In this case, as for the gear forged initially, as shown in FIG.
The 0 tooth portion 101 fits closely with the receiving tooth portion 103 of the receiving jig 102, but as the number of forging shots increases, the forging die gradually wears, and the hem portion of the tooth portion 101 becomes wider. When this gear 100 is set to 102 on a receiving jig, FIG.
As shown in (b), the tooth portion 101 of the gear 100 is not completely fitted to the receiving tooth portion 103 of the receiving jig 102 and is in a floating state.

[0006] Since the floating amount of the tooth portion 101 is not uniform over the entire circumference, the gear 100 is set on the receiving jig 102 in an oblique state, and finishing is performed in this state. As shown in FIG. 8, the axis L of the gear 100 deviates from the apex angle C of the tooth. If the deviation is large, vibration occurs or operation failure occurs.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a book
Invention, method of manufacturing the receiving jig for tooth wheel machining receives form the teeth by electrical discharge machining using the total tooth electrodes conical receiving surface of the material, then the total tooth electrode or its same shape A groove is formed on both side pitch lines of the tooth portion of the electrode, and the receiving tooth portion is subjected to electric discharge machining again using the electrode formed with the groove, so that a ridge portion is left on the opposite pitch line of the receiving tooth portion. I made it.

[0008]

[Function] In manufacturing a receiving jig by electric discharge machining,
Grooves on both side pitch lines of the total tooth profile electrode with teeth formed
Formed, and again using the total tooth shaped electrode having the groove formed therein.
Performs electrical discharge machining on the receiving teeth, and opposes the pitch of the receiving teeth
Leave ridges on the line.

[0009]

Embodiments of the present invention will be described below with reference to the accompanying drawings. Here, FIG. 1 is a longitudinal sectional view of a receiving jig according to the present invention, and FIG. 2 is an enlarged view of a main part of the receiving jig.

A receiving jig 1 is provided on a disk-shaped main body 2 with a cylindrical shaft portion 3.
The end surface of the cylindrical shaft portion 3 is a concave conical receiving surface 4, and a tooth portion formed on the entire periphery of the receiving surface 4 with a convex conical peripheral surface inclined with respect to the axis of the bevel gear 10 or the like. 11 is formed with a receiving tooth portion 5 to be fitted, and a ridge portion 6 is formed on a pitch line opposed to the tooth portion 5.

The position at which the ridge 6 is formed is defined by the gear 10
Even when the forging die for forming the abrasion is worn, the influence is the least, that is, the approximate center of the pitch line avoiding the skirt and tip of the tooth portion 11. Also, the ridges 6 need to be formed on the opposing pitch lines, but may not be formed on all the pitch lines, and may be formed on, for example, three or more receiving teeth portions 5 at equal intervals on the circumference of the receiving surface 4. .

Next, an example of a method of manufacturing the receiving jig 1 will be described with reference to FIGS. First, as shown in FIG.
The material 8 is subjected to electric discharge machining using the total tooth shape electrode 7 having the same shape as the gear 10 to form the receiving tooth portion 5. The size of the receiving tooth portion 5 formed at this time is set to be smaller than the final size by about 0.5 mm.

Next, as shown in FIG. 4, a groove 7a having a width of about 3 to 4 mm and a depth of about 0.5 mm is formed on both side pitch lines of the tooth portion of the total tooth shape electrode 7 by an end mill 9.
As shown in FIG. 5, the receiving tooth portion 5 is again subjected to electrical discharge machining using the total tooth shape electrode 7 to leave the ridge 6 on the pitch line of the receiving tooth portion 5 facing.

In order to race the back surface and end surface of the gear 10 using the receiving jig 1 manufactured as described above,
The tooth portion 11 of the gear 10 is fitted into the receiving tooth portion 5 of the receiving jig 1, the tooth portion 11 is brought into contact with the ridge 6 of the receiving tooth portion 5, and then the gear 10 is fixed by a conventional clamper. Then, the receiving jig 1 and the gear 10 are integrally rotated to perform finishing.

In the embodiment, the receiving surface of the receiving jig has a concave conical shape, and the tooth forming surface of the gear has a convex conical shape. Although the electric discharge machining has been described as an optimal method for manufacturing the jig, the jig may be manufactured by NC processing or the like.

[0016]

FIGS. 6 (a) and 6 (b) show the teeth when the differential side gear and the pinion gear are finished with the receiving jig of the present invention and when the finishing is performed with the conventional receiving jig. FIGS. 7A and 7B are graphs comparing the runout of the groove (end face), and FIGS. 7A and 7B are graphs comparing the runout of the back surface. There is no product that falls off, and the quality can be improved.

[0017]

That is, according to the present invention, when manufacturing the receiving jig by electric discharge machining, grooves are formed on both side pitch lines of the total tooth shape electrode having the receiving tooth portion, and the total tooth shape electrode having the groove is formed. Again, the receiving tooth portion is subjected to electrical discharge machining,
Since the ridges are left on the pitch line opposed to the receiving teeth, a highly accurate receiving jig can be easily manufactured using the electrode material without waste.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a receiving jig according to the present invention.

FIG. 2 is an enlarged view of a main part of the receiving jig.

FIG. 3 is a view showing a manufacturing process of a receiving jig.

FIG. 4 is a view showing a manufacturing process of a receiving jig.

FIG. 5 is a diagram showing a manufacturing process of a receiving jig.

FIG. 6 is a graph comparing the case where the receiving jig according to the present invention is used and the conventional example with respect to tooth groove runout.

FIG. 7 is a graph comparing the case where the receiving jig according to the present invention is used and the conventional example with respect to runout on the back surface.

FIG. 8 is a view showing a state in which a gear is set on a receiving jig and lace processing is performed.

FIG. 9 is a diagram for explaining the disadvantages of the conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Receiving jig, 4 ... Receiving surface, 5 ... Receiving tooth part, 6 ... Protrusion part, 7 ... Total tooth shape electrode, 8 Material of receiving jig, 10 ... Gear,
11 ... teeth.

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B23F 23/06 B23H 9/00

Claims (1)

(57) [Claims] 1. A receiving tooth portion is formed on a conical receiving surface of a material by electric discharge machining using a total tooth shape electrode, and a groove is formed on both side pitch lines of the tooth portion of the total tooth shape electrode or an electrode of the same shape. The gear tooth machining is characterized in that the receiving tooth portion is subjected to electrical discharge machining again using the electrode having the groove formed therein, so that a ridge portion is left on a pitch line opposed to the receiving tooth portion. Manufacturing method of receiving jig.