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Manufacturing method of pulley shaft for belt continuously variable transmission

A technology of continuously variable transmission and manufacturing method, applied in the direction of elements with teeth, belts/chains/gears, portable lifting devices, etc., can solve the problem that materials cannot be spread all over the model, the hardness of the workpiece is not sufficiently reduced, and the fluidity of the model material is reduced, etc. problems, to achieve the effect of ensuring fluidity, suppressing temperature drop, and improving durability

Active Publication Date: 2021-03-19
JATCO LTD
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  • Description
  • Claims
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Problems solved by technology

[0007] However, in subthermal forging, the reduction in hardness of the workpiece due to heating is insufficient, and the fluidity of the material in the mold is reduced. Therefore, the material cannot spread throughout the mold, and in particular, the material cannot fill the above-mentioned parking gear part (in order to form a parking gear). The groove part of the model set for the gear), may become a defective product

Method used

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  • Manufacturing method of pulley shaft for belt continuously variable transmission
  • Manufacturing method of pulley shaft for belt continuously variable transmission
  • Manufacturing method of pulley shaft for belt continuously variable transmission

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Embodiment Construction

[0035] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0036] In addition, the embodiments shown below are merely examples, and various modifications and technical applications not explicitly described in the following embodiments are not excluded.

[0037] In addition, the forging device used in this embodiment is the same as a conventionally well-known general forging device except for the model shape of the model, and therefore description of each part of the device will be omitted.

[0038] Furthermore, in figure 1 In , in order to clarify the shape of the workpiece formed in each process, the shading of the cross-sectional portion of the forging device is omitted.

[0039] First, as a pre-process of implementing the first process, an unillustrated cylindrical workpiece made of high Si steel is heated to 1120° C. to 1160° C. (subthermal forging).

[0040] After that, the heated cylindrical workpiece is placed on the ...

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Abstract

A method for manufacturing a pulley shaft for a belt-type continuously variable transmission in which a shaft section, a conical pulley section, and a parking gear disposed on the rear surface side ofthe conical pulley section are integrally manufactured by forging, the parking gear section being filled with a material in a finish machining step in which the pulley section and the parking gear are formed. A preparation step for forming a conical pulley preparation section (14c) having an apex angle (theta1) smaller than the apex angle (theta3) of the cone of the pulley section (120) is performed before the finish machining step for forming the conical pulley section (120) and the parking gear (130).

Description

technical field [0001] The present invention relates to a method for manufacturing a pulley shaft constituting a fixed pulley of a belt-type continuously variable transmission (hereinafter referred to as CVT), and more particularly to a method for integrally forming a pulley shaft on the back side of the pulley (the surface opposite to the pulley surface) and the pulley. A preferred manufacturing method for manufacturing a pulley shaft of a parking gear having a slightly smaller pulley outer diameter. Background technique [0002] A CVT mounted on a vehicle needs to be equipped with a parking mechanism, but it is known to integrally attach a parking gear constituting the parking mechanism to the rear side of a pulley surface of a fixed pulley (pulley shaft) (Patent Document 1). [0003] Patent Document 1: (Japanese) Unexamined Patent Publication No. 11-254084 [0004] In the case of manufacturing the above-mentioned pulley shaft by forging, steel with a silicon (Si) content...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21K1/12F16H55/52
Inventor 大岛骏介
Owner JATCO LTD
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