Producing method of gear structure body and middle structure body thereof
A manufacturing method and structure technology, applied in the direction of manufacturing tools, elements with teeth, belts/chains/gears, etc., can solve the problem of increased weight of gear structures, inability to accurately ensure gear formation accuracy, and space reduction of hollow parts Small problems, to achieve the effect of high forming accuracy
Active Publication Date: 2015-03-25
SUMITOMO HEAVY IND LTD
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Problems solved by technology
[0007] However, the production method disclosed in this Patent Document 1 has the following problem: Since the plastic bonding must be performed after the adjacently formed gears are formed, when the shaft member is a hollow cylindrical member, the cylindrical member is Deformation occurs during plastic bonding, and in particular, the formation accuracy of gears (placed adjacent to the plastic bonding gear) cannot be accurately guaranteed
However, the increase in the wall thickness of the cylindrical member not only leads to an increase in the weight and cost of the gear structure (and the power transmission device assembled with the gear structure), but also means that the space for the hollow part to be secured is correspondingly reduced, so the disadvantage larger
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[0020] An example of an embodiment of the present invention will be described in detail below with reference to the drawings.
[0021] Figure 2(A) to Figure 2(D) A speed reduction device for driving a joint of an industrial robot incorporating a gear structure manufactured by the method of manufacturing a gear structure according to an example of the embodiment of the present invention is shown.
[0022] Fig. 2 (A) is its overall sectional view, Fig. 2 (B) is the IIB-IIB sectional view of Fig. 2 (A), Fig. 2 (C) is the IIC-IIC sectional view of Fig. 2 (A), Fig. 2 ( D) is an enlarged sectional view of part IID of FIG. 2(A).
[0023] The reduction gear G1 includes an input unit 12 , a reduction ratio adjustment unit 14 , and a final reduction mechanism unit 16 .
[0024] The input unit 12 is a part that receives rotation from a motor (not shown), and has an input shaft 18 and a pinion 20 integrated with the input shaft 18 in this embodiment.
[0025] The reduction ratio adjus...
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Abstract
The method involves forming a groove on an external periphery of a hollow shaft (24), so that a gear wheel (26) is mounted on the shaft. Another gear wheel (28) is formed in the external periphery of the shaft, so that root diameters (26d, 28d) of ends of the latter gear wheel differ from each other along axial direction. The former gear wheel is designed such that a gear wheel body (26B) of the former gear wheel is pressed into external periphery of the groove along the axial direction and the gear wheel body is fixed on the external periphery of the groove by plastic flow. An independent claim is also included for a gear wheel intermediate structure.
Description
technical field [0001] This application claims priority based on Japanese Patent Application No. 2011-087826 filed on April 12, 2011. All the content of the application is used in this specification by reference. [0002] The invention relates to a manufacturing method of a gear structure and an intermediate structure of the gear structure. Background technique [0003] In power transmission devices and the like, gear structures are widely used, for example, to adjust reduction ratios. In such a gear structure, two gears are usually formed adjacent to each other in the axial direction on the outer periphery of the shaft member. And, one gear meshes with the gear on the front stage side of the gear structure, and the other gear meshes with the gear on the rear stage side of the gear structure body. By changing the number of teeth of each gear, the reduction ratio of the entire power transmission device can be adjusted through the gear structure. [0004] As one of the met...
Claims
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IPC IPC(8): F16H55/17
CPCB23P15/14F16H57/0025B23P11/00B23F17/00B21K1/30F16H55/17B21K25/00
Inventor 石川哲三芳贺卓志津庆刚
Owner SUMITOMO HEAVY IND LTD