KR20160125220A - working process of connecting-bevel gear for car differential gear - Google Patents

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

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Publication number
KR20160125220A
KR20160125220A KR1020150056122A KR20150056122A KR20160125220A KR 20160125220 A KR20160125220 A KR 20160125220A KR 1020150056122 A KR1020150056122 A KR 1020150056122A KR 20150056122 A KR20150056122 A KR 20150056122A KR 20160125220 A KR20160125220 A KR 20160125220A
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KR
South Korea
Prior art keywords
cutting
bevel gear
gear
shaft hole
connecting bevel
Prior art date
Application number
KR1020150056122A
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Korean (ko)
Inventor
배태범
Original Assignee
배태범
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by 배태범 filed Critical 배태범
Priority to KR1020150056122A priority Critical patent/KR20160125220A/en
Publication of KR20160125220A publication Critical patent/KR20160125220A/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)
  • Gears, Cams (AREA)
  • Retarders (AREA)

Abstract

The present invention relates to a bevel gear processing method for a differential apparatus for a vehicle which can simplify a process and shorten the time required for manufacturing and can be machined more precisely. A step of fixing the connecting bevel gear, which is rotatably installed in the machine tool, to fix the gear tooth forming part to a chuck having a tapered portion such as a tilt of the gear tooth; An arc end cutting step of cutting the arc end by approaching the cutting tool while rotating the connecting 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 connecting bevel gear; An acute angle cutting tool having an acute angle to the shaft hole of the connecting bevel gear and a distance between the cutting edge and the cutting edge being at least greater than the width of the borehole and smaller than the diameter of the borehole is passed through the borehole, A flat bottom cutting step for cutting the part; And a chamfering step of chamfering both end portions of the shaft hole.

Description

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

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bevel gear processing method for a differential apparatus for a vehicle, and more particularly, to a bevel gear processing method for a differential apparatus for a vehicle that can simplify a 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 various technologies related to the differential gear device having such a configuration, including Patent Documents 1 to 3, and these techniques are technologies in which power transmission efficiency is improved by varying the arrangement and type of gears.

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

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 bevel gear is generally provided with a gear teeth forming portion 600g having gear teeth formed in a direction tilted with respect to the central axis, and a shaft hole 600s to which the shaft is engaged, Particularly, the connecting bevel gear 600 for a differential gear unit is provided with an arc-shaped end on a surface facing the housing. As a method for machining the connecting bevel gear, a bevel gear having a gear teeth formed by cold forging The bevel gear is then turned to the opposite side to fix it to the chuck, and the remaining uncut end is cut.

When the connecting bevel gear is machined in this manner, the connecting bevel gear must be fixed to the chuck by changing the direction of the connecting bevel gear as described above, so that the machining process is complicated and takes a long 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. Korean 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 connecting bevel gear for a differential apparatus for a vehicle, .

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 for machining a connecting bevel gear for a differential apparatus for a vehicle, comprising: a driving bevel gear provided at an end of a main shaft; a ring gear provided in the differential case; An axial hole provided between the driven bevel gears of the differential gear device including the driven bevel gear and through which the fixed shaft fixed to the housing passes, an arcuate end portion formed in an arcuate shape to prevent contact with the housing, Wherein the connecting bevel gear is formed by cold forging, and the formed connecting bevel gear is machined using a machine tool, the method comprising the steps of:

A step of fixing the connecting bevel gear, which is rotatably installed in the machine tool, to fix the gear tooth forming part to a chuck having a tapered portion such as a tilt of the gear tooth; An arc end cutting step of cutting the arc end by approaching the cutting tool while rotating the connecting 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 connecting bevel gear; An acute angle cutting tool having an acute angle to the shaft hole of the connecting bevel gear and a distance between the cutting edge and the cutting edge being at least greater than the width of the borehole and smaller than the diameter of the borehole is passed through the borehole, A flat bottom cutting step for cutting the part; And a chamfering step of chamfering both end portions of the shaft hole.

In the machining process, it is preferable that coolant is supplied to prevent thermal deformation due to friction between the tool and the connecting bevel gear.

The method for machining a connecting 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 once fixed to the chuck of the machine tool.

Further, according to the method for machining a connecting 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.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a flow chart of a method of processing a connecting 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 bevel gear in the present invention.
4 is a side view showing the contact state between the cutting tool and the bevel gear in the present invention.
5 is a side view showing the contact state between the cutting tool and the bevel gear in the present invention.
6 is a perspective view showing an example of a conventional vehicular differential apparatus;
7 is a perspective view showing a bevel gear installed in a conventional vehicular differential apparatus.
8 is a perspective view showing a bevel gear installed in a conventional vehicular differential apparatus.

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 connecting bevel gear is once fixed to one machine tool, so that the manufacturing process can be simplified and the connecting bevel gear can be manufactured more precisely.

In the method for machining a connecting bevel gear for a differential apparatus for a vehicle according to the present invention, the gear teeth are formed by cold forging, and the whole process is performed while the connecting bevel gear having the gear teeth is fixed to the chuck of the machine tool.

As shown in FIGS. 7 and 8, a connecting bevel gear to be processed by the processing method of the present invention includes a gear tooth portion 600g having a central shaft hole 600s and a gear tooth at a predetermined angle formed at one end thereof, And an arcuate end portion 600a formed at an opposite end of the gear tooth shaped portion 600g from the shaft hole toward the outer circumferential end and inclined in an arcuate shape. Of course, at the end of the gear tooth shaped portion 600g, a flat flat end portion 600f perpendicular to the shaft hole is formed.

6, the connecting bevel gear 600 is installed between the driven bevel gears 500 installed on the axle shaft 200 of the differential gear device, and is rotated in a state in which the driven gear is not pushed inward To rotate.

As described above with reference to the connecting bevel gear 600, a chuck having a tooth portion opposed to the inclination of the tooth between the gear teeth formed in the gear teeth forming portion 600g and the gear teeth, Thereby fixing the connecting bevel gear 600 to the machine tool.

While the connecting bevel gear 600 is fixed, the machine tool is driven to rotate the connecting bevel gear 600, and a desired surface is cut using a cutting tool.

The process of cutting the connecting bevel gear 600 includes the arcuate end cutting step, the punch cutting step, the flat cutting step and the chamfering step.

As shown in FIG. 2 (a), the arc-shaped end cutting step is a cutting operation using a cutting tool configured to rotate the connecting bevel gear by driving a machine tool, As shown in Fig. 3 in the drawing, the cutting is performed while moving the cutting tool along the arc-shaped surface of the arc-shaped end portion 600f.

In the arc end cutting step, heat is generated in cutting the connecting bevel gear rotating the cutting tool at a high speed. Since the cutting bevel gear as well as the connecting bevel gear can be deteriorated or softened by the generated heat, It is preferable to supply oil.

On the other hand, 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 600s of the connecting bevel gear. As shown in FIG. 2B and FIG. 4, in the cutting step, the cutting tool is inserted into the shaft hole 600s so that the cutting edge is perpendicular to the fixing rod, thereby cutting the inner wall of the shaft hole. 6, the processed connecting bevel gear 600 is installed in a state where the fixed shaft 700s having both ends fixed to the housing 700 is inserted into the shaft hole 600s and is rotated. Therefore, Should have high precision.

5, the cutting edge is formed at an acute angle with the shaft hole 600s of the connecting bevel gear, and the distance between the fixed rod and the cutting edge is at least equal to the width of the flat end 600f, The work is done with acute angle cutting tool which is big and smaller than the diameter of the shaft hole. That is, as shown in FIG. 2C and FIG. 5 in the drawings, the acute angle cutting tool has a configuration in which the central axis of the fixing rod and the cutting edge are at an acute angle, And the end of the cutting edge has a length longer than a distance between the center of the connecting bevel gear and the edge of the flat end, but smaller than the diameter of the shaft hole 600s.

As shown in Fig. 6 in the drawing, the bare end 600f is a portion that does not contact other components of the differential gear unit, and precise machining is not required.

As described above, the connecting bevel gear 600 processed by the above-described processing is installed in a state where the fixed shaft 700s is fitted in the shaft hole 600s.

It is preferable to chamfer both end portions of the shaft hole so that the fixed shaft 700s can be easily inserted into the shaft hole. The connecting bevel gear, which has completed the cutting of the shaft hole, arc end and the flat end portion, preferably further carries out the step of chamfering the shaft hole. In this case, as shown in FIG. 2 (a) Of tools may be used.

Meanwhile, a method of machining a connecting bevel gear for a differential apparatus of a vehicle according to the above-described method may be carried out by using various kinds 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 portion 600f:
600g: Gear tooth type part 600s:
700: Housing

Claims (2)

A driving bevel gear 300 provided at an end of the main shaft 100, a ring gear 400 provided at the differential case, a plurality of driven bevel gears 500 rotating in engagement with the ring gear and provided on the axle shaft 200 A shaft hole 600s provided between the driven bevel gears of the differential gear unit and including a fixed shaft 700s fixed to the housing 700 and an arcuate end portion formed in an arc shape to prevent contact with the housing And a gear tooth shaped portion (600g) formed on an opposite side of the arcuate end portion, the method comprising:
The connecting bevel gear 600 is formed by cold forging, and the formed connecting bevel gear is machined using a machine tool,
The machining operation includes a connecting bevel gear fixing step that is rotatably installed on the machine tool and fixes the gear tooth formed part 600g to a chuck having a tapered portion having a slope such as a gear tooth;
An arc end cutting step of cutting the arc end (600f) by approaching the cutting tool while rotating the connecting 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 (600s) of the connecting bevel gear;
An edge cutting tool having an acute angle with the shaft hole 600s of the connecting bevel gear and a distance between the cutting edge and the cutting edge is at least larger than the width of the flat end 600f and smaller than the diameter of the shaft hole, A bottom cutting step of cutting; And
And a chamfering step of chamfering both end portions of the shaft hole (600s).
The method according to claim 1,
Wherein a coolant is supplied to prevent the tool from being thermally deformed due to friction between the tool and the connecting bevel gear in the machining process.
KR1020150056122A 2015-04-21 2015-04-21 working process of connecting-bevel gear for car differential gear KR20160125220A (en)

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Application Number Priority Date Filing Date Title
KR1020150056122A KR20160125220A (en) 2015-04-21 2015-04-21 working process of connecting-bevel gear for car differential gear

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Application Number Priority Date Filing Date Title
KR1020150056122A KR20160125220A (en) 2015-04-21 2015-04-21 working process of connecting-bevel gear for car differential gear

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102293620B1 (en) * 2021-05-20 2021-08-24 김두연 Manufacturing Method of the Fixing Device of the Blade for the Lawnmower

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102293620B1 (en) * 2021-05-20 2021-08-24 김두연 Manufacturing Method of the Fixing Device of the Blade for the Lawnmower

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