Gear support and method of manufacturing the same

Abstract

Provided are a gear support and a method of manufacturing the same. The number of parts and the procedures for manufacturing the gear support are minimized, and the decreasing strength, caused by poor bonding, is minimized. A plurality of lower side support surface predetermined portions are arranged on the periphery of the gear support. The axial outer side of each lower side support surface predetermined portion is respectively provided with an upper side support surface predetermined portion. Blank material of wall predetermined portions are disposed among the adjacent lower side support surface predetermined portions so that the lower side support surface predetermined portions are bent inwardly in a radial manner. An opening, which is opened on the inner side, is arranged between the lower side support surface predetermined portions and the upper side support surface predetermined portions. The opening allows a planet gear to be exposed from the inner side of the gear support, allows the radial inner region of the blank material including the lower side support surface predetermined portions and the wall predetermined portions to be stretched, and makes the lower side support surface predetermined portions correspondingly move toward the upper side support surface predetermined portions. Therefore, an upper support surface, a lower support surface and a wall portion are formed, wherein the upper support surface and the lower support surface are parallel and are used for supporting the planet gear, and the wall portion axially extends along the gear support.

Description

technical field [0001] The invention relates to a gear carrier of a planetary gear mechanism and a manufacturing method thereof. Background technique [0002] The planetary gear mechanism is composed of a sun gear, a plurality of planetary gears meshing with the sun gear, a carrier supporting the plurality of planetary gears, and a ring gear meshing with the plurality of planetary gears. In order to support multiple planetary gears from both sides, the carrier must have two parallel faces. [0003] Patent Document 1 discloses, as a method of manufacturing a carrier, a method of forming the above-mentioned two parallel surfaces by joining a ring-shaped carrier plate to a cup-shaped carrier plate by electron beam welding. [0004] Patent Document 1: (Japanese) Unexamined Patent Publication No. 58-61982 [0005] However, in the above-mentioned method, it is necessary to separately machine the two carrier plates and then join them by electron beam welding. Therefore, in the a...

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Problems solved by technology

[0005] However, in the above method, the two carrier plates need to be machined separately and then joined by electron beam welding

Therefore, in the above-mentioned method, the number of parts and the number of processing steps increase, and there is also a problem that the strength is easily reduced due to poor bonding.

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