SU916831A1 - Conical gear wheel - Google Patents

Description

(54) TAPERED GEAR

one

The invention relates to machine parts, namely, to the design of double-bevel gears manufactured by powder metallurgy from self-lubricating materials, mainly for planetary gears with precession, their links used in small-sized drives.

The known two-rotate zubchat conical gear of planetary gearing has a groove between the rims 1.

However, the manufacture of such gear by powder metallurgy methods is difficult, since it requires a rather complicated press tool that forms a bevel gear.

Closest to the present invention is a bevel gear that contains teeth and an annular bridge between teeth in a circumferential direction and is made of a cermet material. The annular bridge of this single-pin shchester is located at the free end of the crown and serves to reinforce the tooth stem 2.

The use of such a design in a double-wedge bevel gear made from self-lubricating materials creates significant difficulties in the manufacture of powder metallurgy methods, since the press material can be wedged between the elements forming the conjugate ends of the crowns, which can lead to the destruction of the teeth when the blank is removed from the mold elements.

The purpose of the invention is to increase the technologicity of the two-pinion gear of self-lubricating materials.

This goal is achieved by the fact that in f

 bevel gear containing tooth and

an annular bridge between the teeth in the circumferential direction and made of a cermet material, an annular bridge located between the mating ends of the rims.

In addition, the annular lintel has a lower porosity than the tooth.

FIG. 1 shows a bevel gear with a different number of rim teeth; in fig. 2 - conical gear with the same

20 number of teeth-crowns; in fig. 3 shows section A-A in FIG. 1 and 2.

The conical gear contains an annular bridge 1 between the teeth in the circumferential direction and two gear rims 2 and

3, placed on the rim 4. The gear wheel can be made of metal-ceramic material, including self-lubricating.

Jumper 1 has a trapezoidal shape and a rounded top, which avoids its jamming in the mold elements during pressing and pressing down of the pinion. The angle at the apex of the trapezium must be greater than the wedging angle determined by the coefficients of friction between the gear and the mold material. In order to increase the rigidity and strength, the web can have a higher density (lower porosity) compared to the material of the teeth, which is achieved by pressing it down due to the varying degree of compression of the gear teeth and web.

Placing an annular lintel between the mating ends of the crowns of a twin-wed bevel gear made by pressing from self-sustaining materials increases the strength of the tooth, allowing drying without

There is tooth decay repression.

Claims (2)

Invention Formula . A conical gear containing teeth and an annular bridge between the teeth in the circumferential direction and is made of a cermet material, characterized in that, in order to improve the manufacturability of the two-pinion gear of self-lubricating materials, the annular bridge is located between the conjugate ends of the rims. 2. The conical gear according to claim 1, characterized in that the annular web has a smaller porosity than the tooth. , Information sources, taken into account in the examination 1.Patent of France No. 2087628, cl. F 16 N 1/00, published. 1971, FIG. 3 2. The UK patent number 1327613, cl. F2 Q pub. 1973 (prototype).