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Flexible externally toothed gear for strain wave gearing and method for manufacturing same

A technology of wave gear device and manufacturing method, which is applied in the directions of gear transmission device, transmission device, manufacturing tool, etc., to achieve the effects of improving the fatigue resistance of the bottom of the tooth, improving the wear condition of the tooth surface, and improving the hardness

Active Publication Date: 2015-08-26
HARMONIC DRIVE SYST IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] However, there is an endless demand for an increase in the operating torque and an improvement in durability of the wave gear device

Method used

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  • Flexible externally toothed gear for strain wave gearing and method for manufacturing same
  • Flexible externally toothed gear for strain wave gearing and method for manufacturing same
  • Flexible externally toothed gear for strain wave gearing and method for manufacturing same

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Embodiment Construction

[0028] Hereinafter, a method of manufacturing a flexible externally toothed gear to which a wave gear device according to the present invention is applied will be described with reference to the drawings.

[0029] (Flexible External Gears)

[0030] First, refer to figure 1 The flexible external gear of the wave gear device will be described. Such as figure 1 As shown in (a), the cup-shaped flexible externally toothed gear 1 includes: a thin-walled cylindrical body part 2 capable of bending in the radial direction; A thin-walled spacer part 3 that extends radially inward and can be flexed; a thick-walled disk-shaped sleeve part 4 formed integrally with the central part of the spacer part 3; In the tooth portion 5 on the other end side of the body portion 2 , external teeth 6 are formed on the tooth portion 5 .

[0031] figure 1 The hat-shaped flexible external tooth gear 10 shown in (b) includes: a thin-walled cylindrical body portion 12 that can be flexed; The thin-walle...

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PUM

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Abstract

A method for manufacturing a flexible externally toothed gear includes: a first step (ST1) for producing a primary molded article by performing near-net-shape plastic working on a material comprising a nickel-free low-alloy steel having a silicon content of 1.45-1.5 wt %; a second step (ST2) for martempering the primary molded article; a third step (ST3) for producing a secondary molded article from the primary molded article; and a fourth step (ST4) for shot-peening the secondary molded article to change the surface portions of the tooth part and other parts to martensite. A flexible externally toothed gear can be obtained in which the surface hardness is kept within a prescribed range and the fatigue strength and abrasion resistance are high.

Description

technical field [0001] The present invention relates to a flexible externally toothed gear of a wave gear device and a manufacturing method thereof, in particular to a flexible externally toothed gear with improved fatigue resistance and wear resistance and a manufacturing method of the flexible externally toothed gear. Background technique [0002] Among flexible externally toothed gears that are components of wave gears commonly used as speed reducers, known are cylindrical flat type, cup type, and top hat type of flexible externally toothed gears. Patent Document 1 describes a flat wave gear device, Patent Document 2 describes a cup-shaped wave gear device, and Patent Document 3 describes a top hat-shaped wave gear device. [0003] The flexible external gears of these wave gear units are made of quenched and tempered steel among special steels with excellent mechanical strength. The surface hardness of flexible external gears with thin walls and high-precision machining ...

Claims

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Application Information

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IPC IPC(8): F16H1/32C21D9/32
CPCF16H55/06C22C38/02C22C38/22C21D8/005C22C38/04C21D6/008F16H55/0833C21D6/005C21D9/32C22C38/38C21D6/002C22C38/34F16H55/17C21D1/22C21D7/06C21D2211/008F16H2049/003B21K1/30B24C1/10F16H1/32
Inventor 小林优折井大介
Owner HARMONIC DRIVE SYST IND CO LTD
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