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Method for manufacturing a resin gear with a metal core

A manufacturing method and metal core technology, which are applied in the direction of gears, other household appliances, household appliances, etc., can solve the problem of strength reduction of resin gears with metal cores, etc., and achieve the effect of suppressing strength reduction and reducing manufacturing costs.

Active Publication Date: 2017-01-11
NAKANISHI METAL WORKS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] In such a case, the strength of the resin gear with a metal core as a molded product decreases

Method used

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  • Method for manufacturing a resin gear with a metal core
  • Method for manufacturing a resin gear with a metal core
  • Method for manufacturing a resin gear with a metal core

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0031] Such as figure 1 As shown in the perspective view of , the resin gear 1 with a metal core manufactured by the method of manufacturing a resin gear with a metal core according to Embodiment 1 of the present invention is used, for example, as a turbine used in electric power steering. The cylinder 2 is composed of a synthetic resin ring-shaped tooth portion 3 covering its outer periphery, and teeth 4 meshing with other gears are formed on the outer peripheral surface.

[0032] In addition, each of the annular tooth portions 3 is made of, for example, fiber-reinforced resin, and is composed of an annular inner diameter side member 3A and an annular outer diameter side member 3B of different materials.

[0033] The resin gear with metal core 1 can recognize three gate traces in the secondary molding process on its side (refer to gate positions G21, G22, and G23).

[0034] Such a resin gear 1 with a metal core can be significantly reduced in weight as a whole compared to a...

Embodiment approach 2

[0063] Figure 7 In the metal-cored resin gear 1 manufactured by the metal-cored resin gear manufacturing method according to Embodiment 2 of the present invention shown in the plan view of , the same symbols as those in Embodiment 1 denote the same or corresponding parts.

[0064] The method of manufacturing a resin gear with a metal core according to Embodiment 2 of the present invention is the same as the method of manufacturing a resin gear with a metal core according to Embodiment 1, and includes the sleeve 2 as an insert and inserting the inner diameter side in the first cavity mold. A primary molding process of injection molding the part 3A, and a secondary molding process of injecting the outer diameter side part 3B by placing the primary molded product in the second cavity mold.

[0065] In addition, in the resin gear 1 with a metal core, one gate trace (refer to gate position G2) in the secondary molding process can be recognized on the side surface.

[0066] (gate ...

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Abstract

The present invention is intended to provide a method for manufacturing a resin gear with a core metal by which there is no reduction in strength even with gates allowing decrease in material costs such as pin gates in the molding die for injection molding. The manufacturing method includes: gates at a primary molding step and gates at a secondary molding step are pin gates or the like. The number of the gates at the primary molding step and the number of the gates at the secondary molding step are plural and identical, and the gates are arranged circumferentially. Gate positions G21, ... at the secondary molding step are circumferentially intermediate or nearly circumferentially intermediate between gate positions G11, ... and weld positions W11, ... adjacent to the gate positions G11, ... in the primary molded article.

Description

technical field [0001] This invention relates to the manufacturing method of the resin gear for power transmission which consists of the metal sleeve which is a metal core, and the tooth part made of synthetic resin which covers the outer periphery. Background technique [0002] In order to reduce the weight and noise of power transmission gears, there is a structure in which the teeth that mesh with other metal gears are made of synthetic resin, that is, there are metal sleeves as metal cores and A resin gear with a metal core consisting of synthetic resin teeth covering the outer circumference of the metal sleeve. [0003] In such a resin gear with a metal core, in order to reduce the manufacturing cost and improve the quietness, the above-mentioned teeth are passed through the outer diameter side member (gear body, second molded part) and the inner diameter side member (annular member, In the case of the configuration of the first forming part), the outer diameter side m...

Claims

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Application Information

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IPC IPC(8): B29C45/14B29C45/26B29C45/27B29L15/00
CPCB29C45/0003B29C45/0005B29C45/0025B29C45/14336B29C45/2673B29C45/2708B29C2045/0027B29C2045/2677B29L2015/003B29C45/1671B29C2045/0032B29C2045/1692B29K2105/06B29K2705/00B29L2015/006B29C33/123B29C45/14065B29C45/1459B29C45/1615B29C45/1675B29C2045/14122B29C2045/14147B29C2045/14442
Inventor 中村成嘉鲇川勇斗
Owner NAKANISHI METAL WORKS CO LTD
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