KR20160125211A - working process of driven-bevel gear for car differential gear - Google Patents

working process of driven-bevel gear for car differential gear Download PDF

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Publication number
KR20160125211A
KR20160125211A KR1020150056101A KR20150056101A KR20160125211A KR 20160125211 A KR20160125211 A KR 20160125211A KR 1020150056101 A KR1020150056101 A KR 1020150056101A KR 20150056101 A KR20150056101 A KR 20150056101A KR 20160125211 A KR20160125211 A KR 20160125211A
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KR
South Korea
Prior art keywords
bevel gear
cutting
gear
driven bevel
driven
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Application number
KR1020150056101A
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Korean (ko)
Inventor
배태범
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배태범
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Publication date
Application filed by 배태범 filed Critical 배태범
Priority to KR1020150056101A priority Critical patent/KR20160125211A/en
Publication of KR20160125211A publication Critical patent/KR20160125211A/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23F—MAKING GEARS OR TOOTHED RACKS
    • B23F15/00—Methods or machines for making gear wheels of special kinds not covered by groups B23F7/00 - B23F13/00
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B5/00—Turning-machines or devices specially adapted for particular work; Accessories specially adapted therefor
    • B23B5/16—Turning-machines or devices specially adapted for particular work; Accessories specially adapted therefor for bevelling, chamfering, or deburring the ends of bars or tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q11/00—Accessories fitted to machine tools for keeping tools or parts of the machine in good working condition or for cooling work; Safety devices specially combined with or arranged in, or specially adapted for use in connection with, machine tools
    • B23Q11/10—Arrangements for cooling or lubricating tools or work

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)
  • Gears, Cams (AREA)
  • Retarders (AREA)

Abstract

The present invention relates to a method to work a bevel gear for a differential gear of a vehicle, capable of shortening time required for manufacturing by simplifying a process and precisely performing working, comprising: a driven-bevel gear fixating step of working a formed driven-bevel gear using machine tools by rotationally installing the driven-bevel gear in the machine tools and fixating the driven-bevel gear in a chuck having a serrated portion with the same slope as that of gear teeth formed in a gear teeth formation part; a circular arc end portion and a shaft support part cutting step of cutting a circular arc end portion and a shaft support part extending from one side of the gear teeth by bringing a cutter close thereto, while rotating the driven-bevel gear by operating the machine tools; a shaft hole cutting step of cutting an inner wall of a shaft hole using a right angle cutting tool having a cutting blade perpendicular to a shaft hole of the driven-bevel gear; a ring fixating protruding portion cutting step of cutting a ring fixating protruding portion using an acute angle cutting tool having a cutting blade at an acute angle with respect to a shaft hole of the driven-bevel gear; and a chamfering step of chamfering both end portions of the shaft hole and an outer end portion of the shaft support part.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a method of machining a bevel gear for a differential device of a vehicle,

The present invention relates to a method of machining a bevel gear for a differential apparatus of a vehicle, and more particularly, to a method of machining a bevel gear for a differential apparatus of a vehicle, which not only shortens the time required for manufacturing by simplifying the process, To a gear processing method.

BACKGROUND ART [0002] Generally, an automobile has a power transmission system for transmitting power generated by an engine to a wheel, and the power transmission system includes a differential gear device.

6, the conventional differential gear device includes a drive bevel gear 300 installed at an end of a main shaft 100, a ring gear 400 installed at a differential case, A plurality of driven bevel gears 500 mounted on the driven bevel gears 200 and a connecting bevel gear 600 disposed between the driven bevel gears.

There are a variety of techniques, including Patent Documents 1 to 3, related to a differential gear device having such a configuration. These techniques are technologies in which power transmission efficiency is improved by varying the arrangement and type of gears.

There are a variety of techniques, including Patent Documents 4 and 5, as techniques for manufacturing or machining various types of gears, including bevel gears for such differential gear devices.

The technology of Patent Document 4 minimizes equipment investment for manufacturing a bevel gear for a differential gear which requires strong durability by manufacturing a bevel gear by a cold forging press method and shortens the manufacturing process and time, The present invention relates to a method of manufacturing a bevel gear for an automotive differential device,

Patent Literature 5 discloses a method of manufacturing a semiconductor device in which a conventional grinding micro-scratch is not generated and a diffuse grating consisting of micro scratches and micro flats arising from grinding wheel motion including eccentric grinding of the grinding wheel and / To a method of finishing a bevel gear to provide a surface structure providing a diffuse structure.

As described above, although various gear manufacturing methods are disclosed in the prior art, no technique related to a method of machining a bevel gear has been disclosed.

As shown in FIGS. 7 and 8, the driven bevel gear typically includes a gear forming portion 500g having a plurality of gear teeth formed in a direction tilted with respect to the central axis, 500s are formed on the inner circumferential surface of the housing 700. An arched end portion 500a having the same shape as the inner circumferential surface of the housing is formed at a portion opposed to the housing 700 and an extended shaft portion 500x is integrally formed Respectively. Further, a ring fixing step portion 500d is formed on the inner circumferential surface of one end portion of the shaft hole to which the stationary ring fixed to the end of the axle shaft is caught.

A method for machining such a driven bevel gear is to cold-forged a machine tool chuck to fix a driven bevel gear having gear teeth thereon, and then rotating one end to finish the bevel gear. And is fixed to a chuck, and then the remaining uncut end is cut.

In the case of machining the driven bevel gear in this way, since the direction of the driven bevel gear must be changed and fixed to the chuck again as described above, the machining process is complicated and takes a lot of time. In addition, If the alignment is not properly performed, a processing error may occur.

Korean Patent Publication No. 10-1998-085847 Korean Patent Publication No. 10-2011-0028045 Korean Patent Publication No. 10-2011-0086924 Korean Patent Publication No. 10-1994-0001989 Korea Patent Publication No. 10-2009-0064544

The present invention has been developed in order to solve the problems of the prior art as described above, and it is an object of the present invention to provide a method of machining a driven bevel gear for a differential apparatus of a vehicle, which can reduce machining time, .

Particularly, since all the machining processes are performed in a state where the machining tool is fixed to the chuck of the machine tool, it is possible to reduce the time required in the machining process, And a method for machining bevel gears.

To achieve these and other advantages and in accordance with the purpose of the present invention, as embodied and broadly described herein, there is provided a method of machining a bevel gear for a differential gear of a vehicle, A differential gear device comprising a ring gear provided in a differential case and a plurality of driven bevel gears meshing with each other by a connecting bevel gear while being rotated in engagement with a ring gear and provided on an axle shaft, A method of machining a driven bevel gear comprising a shaft hole fixed to an axle shaft, an arc end opposite to the housing, an axially supported portion extended to widen the contact area with the axle shaft, and a ring fixing jaw engaged with a stationary ring fixed to an end of the axle shaft In this case,

The driven bevel gear is formed by cold forging, and the formed driven bevel gear is machined by using a machine tool. The machining work is installed rotatably on the machine tool, and the inclined bevel gear A step of securing the bevel gear to a chuck having a tapered inclined portion; A step of machining a machining end portion and an axially supported portion extending from one side of the gear teeth by approaching the cutting tool while rotating the driven bevel gear by operating the machine tool; A cutting step of cutting the inner wall of the shaft hole by using a perpendicular cutting tool whose cutting edge is perpendicular to the shaft hole of the driven bevel gear; A ring fixing jaw cutting step of cutting the ring fixing jaw using an acute angle cutting tool in which the cutting edge forms an acute angle with the axial hole of the driven bevel gear; And a chamfering step of chamfering both end portions of the shaft hole and the outer peripheral end portions of the shaft support portions.

It is preferable that a coolant is supplied in order to prevent thermal deformation by friction between the tool and the driven bevel gear in the machining process.

The method of working a driven bevel gear for a differential apparatus of a vehicle according to the present invention has the effect of reducing the time required in the machining process by performing all the machining processes while being fixed to the chuck of the machine tool.

Further, in the method of working the driven bevel gear for a differential apparatus of a vehicle according to the present invention, the process of fixing the bevel gear is omitted, so that the alignment is not disturbed and the machining can be performed more precisely.

1 is a flow chart of a method of machining a driven bevel gear in the present invention.
2 is a side view showing different examples of cutting tools in the present invention.
3 is a side view showing the contact state between the cutting tool and the driven bevel gear in the present invention.
4 is a side view showing the contact state between the cutting tool and the driven bevel gear in the present invention.
5 is a side view showing the contact state between the cutting tool and the driven bevel gear in the present invention.
6 is a cross-sectional perspective view showing an example of a conventional vehicular differential apparatus.
7 is a perspective view showing a driven bevel gear installed in a conventional differential device for a vehicle.
8 is a perspective view of a driven bevel gear installed in a conventional differential device for a vehicle.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It is to be understood, however, that the invention is not to be limited to the specific embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

Like reference numerals are used for like elements in describing each drawing. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In the present invention, all machining processes are performed in a state in which the driven bevel gear is once fixed to one machine tool, so that the manufacturing process can be simplified and the driven bevel gear can be manufactured more precisely.

The method for machining a driven bevel gear for a differential gear of a vehicle according to the present invention comprises the steps of forming gear teeth by cold forging and fixing the driven bevel gear with the gear teeth fixed to the chuck of the machine tool.

As shown in FIGS. 7 and 8, the driven bevel gear, which is processed by the processing method of the present invention, includes a gear tooth portion 500g formed at one end thereof with a shaft hole 500s at the center and a gear tooth forming a predetermined angle, And a shaft support portion 500x extending from the opposite end of the gear tooth formed portion 500g. An end portion of the gear teeth toward the shaft support portion is formed with a arc-shaped end portion 500a.

At one end of the shaft hole 500s, that is, on the inner circumferential surface of the opposite end portion of the shaft support portion, a ring fixing jaw portion 500d is formed to engage with a fixing ring provided at an end portion of the axle shaft inserted through the shaft hole.

6, the driven bevel gear 500 is fixed to the axle shaft 200 of the differential gear device, and a connecting bevel gear 600 is installed between the driven bevel gears 500 So that the driven bevel gear can be rotated without being pushed inward.

In the process of machining the bevel gear 500, first, the bevel gear 500 is fixed to the chuck of the machine tool as described above, and the gear teeth formed in the gear tooth shaped portion 500g The bevel gear 500 is fixed to the machine tool by using a chuck having a tooth portion facing the inclination of the bevel gear.

In this state, the machine tool is driven while the driven bevel gear 500 is fixed, and a desired surface is cut using a cutting tool while rotating the driven bevel gear 500.

The cutting process includes the arc-shaped end portion and the shaft portion cutting step, the punch cutting step, the ring fixing step cutting step, and the chamfering step.

As shown in FIG. 2 (a), the arc-shaped end portion and the shaft portion cutting step are cutting processes using a cutting tool. The machine tool is driven to rotate the driven bevel gear, As shown in Fig. 3 in the drawing, cutting is performed while moving the cutting tool along the outer surface of the arc-shaped end portion 500f and the shaft supporting portion 500x.

Heat is generated during cutting of the driven bevel gear at which the cutting tool rotates at a high speed in the arc-shaped end portion and the shaft portion cutting step, and the cutting edge of the cutting tool as well as the driven bevel gear can be deteriorated or softened by the generated heat. It is preferable to supply cooling oil.

Also, the cutting step of cutting the inner wall of the shaft hole using a perpendicular cutting tool whose cutting edge is perpendicular to the shaft hole 500s of the driven bevel gear. As shown in FIG. 2B and FIG. 4, in the cutting step, the cutting tool is inserted into the shaft hole 500s so that the cutting edge is perpendicular to the stationary rod to cut the inner wall of the shaft hole. The machined bevel gear 500 is fixed to the end of the axle shaft 200 installed through the housing 700 as shown in FIG.

As a means for fixing the driven bevel gear 500 to the axle shaft 200 in this way, a stationary ring is typically used, and the stationary ring is detachably fixed to the stationary groove formed in the end of the axle shaft 200. As described above, the stationary ring fixed to the axle shaft is positioned in the ring fixing jaw portion 500d formed at one end of the shaft hole of the driven bevel gear.

5, the cutting edge is formed at an acute angle with the axial hole 500s of the driven bevel gear, and the distance between the fixed rod and the cutting edge is smaller than the diameter of the shaft hole, Work is done with a slanted acute angle cutting tool.

That is, as shown in Fig. 2 (C) and Fig. 5 in the drawings, the acute angle cutting tool has a configuration in which the central axis of the stationary rod and the cutting edge are at an acute angle and the cutting edge is hidden by the chuck, And the end of the cutting edge has a length equal to or longer than a distance between the center of the driven bevel gear and the edge of the ring fixing step, and is smaller than the diameter of the shaft hole 500s.

The driven bevel gear 500 processed by the above-described process is installed in the shaft hole 500s at the end of the axle shaft 200 installed through the housing as described above.

It is preferable to chamfer both end portions of the shaft hole so that the axle shaft 200 can be easily inserted into the shaft hole. In this case, it is preferable that the driven bevel gear, which has finished the cutting of the shaft hole, the arc end and the ring fixing step, further carries out a step of chamfering the shaft hole. In this case, as shown in FIG. , A conventional tool can be used.

Meanwhile, a method of machining a driven bevel gear for a differential apparatus of a vehicle according to the above-described method may be performed by using various types of machine tools. For example, a CNC complex machine tool may be used, The friction between the tool and the bevel gear, which is driven at such a high speed, causes heat and overheating, which damages the tool as well as the bevel gear. During the entire machining process, cooling water is supplied between the machining surfaces of the tool and the bevel gear to prevent overheating.

100: spindle 200: axle shaft
300: driven bevel gear 400: ring gear
500: Slave bevel gear 600: Connecting bevel gear
600a: arc end 600d: ring fixing jaw
600g: Gear tooth type part 600s:
700: Housing

Claims (2)

A driving bevel gear 300 provided at an end of the main shaft 100; And a plurality of driven bevel gears (500) provided on the axle shaft (200) and meshing with each other by the connecting bevel gear (600) while rotating in engagement with the ring gear A gear forming portion 500g having a plurality of gear teeth formed therein, a shaft hole 500s fixed to the axle shaft 200, an arcuate end portion 500a opposed to the housing 700, A method of processing a driven bevel gear (500) comprising an extended shaft support (500x) and a ring fixing step (500d) to which a retaining ring fixed to an end of an axle shaft is engaged,
The driven bevel gear 500 is formed by cold forging, and the formed driven bevel gear is machined using a machine tool,
The machining operation is a step of fixing the bevel gear to the chuck having a tapered portion having a slope such as a slope of a gear tooth formed on the gear tooth shaped portion 500g and rotatably installed on the machine tool;
A step of machining the arc end portion and the shaft portion to cut the arc end portion 500a and the arc end portion 500x extending from one side of the gear teeth by approaching the cutting tool while rotating the driven bevel gear by operating the machine tool;
A cutting step of cutting the inner wall of the shaft hole using a perpendicular cutting tool whose cutting edge is perpendicular to the shaft hole (500s) of the driven bevel gear;
A ring fixing jaw cutting step of cutting the ring fixing jaw portion 500d using an acute angle cutting tool whose cutting edge forms an acute angle with the axial hole 500s of the driven bevel gear; And
And a chamfering step of chamfering both end portions of the shaft hole (500s) and the outer peripheral end of the shaft support portion (500x).
The method according to claim 1,
Characterized in that a coolant is supplied in order to prevent thermal deformation by friction between the tool and the driven bevel gear in the machining process.
KR1020150056101A 2015-04-21 2015-04-21 working process of driven-bevel gear for car differential gear KR20160125211A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020150056101A KR20160125211A (en) 2015-04-21 2015-04-21 working process of driven-bevel gear for car differential gear

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020150056101A KR20160125211A (en) 2015-04-21 2015-04-21 working process of driven-bevel gear for car differential gear

Publications (1)

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KR20160125211A true KR20160125211A (en) 2016-10-31

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