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 problems of increased weight of gear structures, reduced space in hollow parts, increased costs, etc., to achieve high form the effect of precision
Active Publication Date: 2012-10-17
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] Hereinafter, an example of the embodiment of the present invention will be described in detail based on the drawings.
[0021] Figure 2(A) to Figure 2(D) This shows a reduction gear for joint driving of an industrial robot equipped with a gear structure to be manufactured by the method of manufacturing a gear structure according to an example of the embodiment of the present invention.
[0022] Fig. 2(A) is the overall cross-sectional view, Fig. 2(B) is the IIB-IIB cross-sectional view of Fig. 2(A), Fig. 2(C) is the IIC-IIC cross-sectional view of Fig. 2(A), and Fig. 2( D) is an enlarged cross-sectional view of the IID part 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 portion 12 is a part that receives rotation from a motor (not shown), and in this embodiment has an input shaft 18 and a pinion gear 20 integrated with the input shaft 18.
[0025] The redu...
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Abstract
The invention provides a producing method of a gear structure body and a middle structure body thereof. When the gear of the gear structure body is fixed through plastic flow, even if the appearance of a cylinder-shaped component is partially deformed, the forming accuracy of the gear disposed at the cylinder-shaped component is maintained to a high degree. The gear structure body is disposed at the periphery of a hollow shaft (the cylinder-shaped component) (24), and is adjacently provided with a first gear (26) and a second gear (28) in an axial direction. The method comprises the steps of firstly forming a basic tooth (groove (26A) for assembling the first gear (26) at the periphery of the hollow shaft (24); secondly making the second gear (28) to have different root circle diameters (28d1, 28d2) of two axial end parts at the periphery of the hollow shaft (24); pressing a gear body (26B) of the first gear (26) along the axial direction at the periphery of the basic tooth (26A), and fixing the gear body (26B) to the periphery of the basic tooth (26A) through plastic flow, forming the first gear (26).
Description
Technical field [0001] This application claims priority based on Japanese Patent Application No. 2011-087826 filed on April 12, 2011. The entire content of its 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 the reduction ratio. Such a gear structure generally has two gears formed adjacent to each other in the axial direction on the outer periphery of the shaft member. Then, one gear is meshed with the gear on the front side of the gear structure, and the other gear is meshed with the gear on the rear side of the gear structure. 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 methods of fixing ...
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