KR101816082B1 - Rear shaft maufacturing methde for 4 wheel drive vehicle's transfer apparatus - Google Patents

Rear shaft maufacturing methde for 4 wheel drive vehicle's transfer apparatus Download PDF

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KR101816082B1
KR101816082B1 KR1020150034858A KR20150034858A KR101816082B1 KR 101816082 B1 KR101816082 B1 KR 101816082B1 KR 1020150034858 A KR1020150034858 A KR 1020150034858A KR 20150034858 A KR20150034858 A KR 20150034858A KR 101816082 B1 KR101816082 B1 KR 101816082B1
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South Korea
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forging
rear wheel
wheel shaft
nitriding
homo
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KR1020150034858A
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Korean (ko)
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KR20160109793A (en
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이영춘
전남진
최창원
손영호
박주은
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(주)화신
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D65/00—Designing, manufacturing, e.g. assembling, facilitating disassembly, or structurally modifying motor vehicles or trailers, not otherwise provided for
    • B62D65/02—Joining sub-units or components to, or positioning sub-units or components with respect to, body shell or other sub-units or components
    • B62D65/10—Joining sub-units or components to, or positioning sub-units or components with respect to, body shell or other sub-units or components the sub-units or components being engines, clutches or transmissions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D53/00—Making other particular articles
    • B21D53/88—Making other particular articles other parts for vehicles, e.g. cowlings, mudguards
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B1/00—Processes of grinding or polishing; Use of auxiliary equipment in connection with such processes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K17/00—Arrangement or mounting of transmissions in vehicles
    • B60K17/34—Arrangement or mounting of transmissions in vehicles for driving both front and rear wheels, e.g. four wheel drive vehicles
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Transportation (AREA)
  • Combustion & Propulsion (AREA)
  • Materials Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Thermal Sciences (AREA)
  • Forging (AREA)

Abstract

The present invention relates to a method for manufacturing a rear wheel shaft of a four-wheel vehicle transfer device,
A pipe material cutting step of cutting the pipe to a length necessary for product molding; A forging step of cold-forging the cut pipe material a plurality of times to form each part; A step of cutting a hole and a groove which can not be formed in the forging step; A heat treatment step of improving the corrosion resistance and strength of the rear wheel shaft subjected to the cutting process; And a grinding and machining step of precisely grinding a joint part with other parts
It is possible to manufacture a rear wheel shaft having a precise structure and excellent mechanical properties as a whole, thereby improving the productivity and reducing the cost.

Description

TECHNICAL FIELD [0001] The present invention relates to a rear wheel shaft manufacturing method for a four-wheel drive transfer device,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a method for manufacturing a rear wheel shaft of a four-wheeled vehicle transfer device, and more particularly, to a method for manufacturing a rear wheel shaft of a four- And a rear wheel shaft of a four-wheeled vehicle transfer device having a compact structure and excellent mechanical properties as a whole by forging.

Generally, in the case of a four-wheel drive vehicle, the vehicle is operated in a 4 × 2 mode in which only the rear wheel or front wheel is driven and in a 4 × 4 mode in which the rear wheel and the front wheel are simultaneously driven, and a transfer device for switching the traveling mode is provided.

The following Patent Document 1 discloses a transmission mechanism of an intermediate transmission, and Patent Document 2 below discloses a four-wheel drive transmission device capable of all-wheel drive.

1 is a front view of a vehicle four-wheel transfer apparatus according to the present invention.

1, a vehicle four-wheel transfer apparatus 100 according to the present invention includes an input shaft 110 to which engine power is input; A rear wheel shaft 120 connected to the input shaft 110 to drive rear wheels; An intermediate shaft 130 connecting the input shaft 110 to the rear wheel shaft 120 and the front wheel shaft 140; And a front wheel shaft (140) connected to the input shaft (110) to drive a front wheel, wherein a rear wheel drive conversion unit (R) for driving or disengaging the rear wheel axle is provided on one side of the input shaft A front wheel drive conversion portion F for front wheel drive or non-drive is provided on one side of the front wheel shaft 140. [

1, reference numeral 111 denotes an idle / high-speed gear, 112 denotes a lower gear, 121 denotes a rear gear, 131 denotes a high gear, 132 denotes a lower gear, 141 denotes an idle gear,

Fig. 2 is a perspective view of a rear wheel shaft of the four-wheel drive transfer device of the vehicle, and Fig. 3 is a longitudinal sectional view of the same vehicle four-wheel transfer device.

2, the rear wheel shaft 120 of the vehicle four-wheel transfer apparatus 100 includes a nut coupling portion 122, a flange coupling spline portion 123, a driving gear engagement spline portion 124, A gear fixing portion 126, and a case bearing coupling portion 127 are provided.

The rear axle 120 of the vehicle four-wheel transfer apparatus 100 has a larger diameter than the diameter of the nut coupling part 122 and a larger diameter than the diameter of the flange coupling spline part 123, The diameter of the spline portion 124 is larger and the diameter of the drive gear fixing portion 125 is larger than the diameter of the drive gear engagement spline portion 124 and the diameter of the gear fixing portion 126 is larger than the diameter of the drive gear fixing portion 125 The diameter of the case fixing portion 127 is smaller than the diameter of the gear fixing portion 126, and the diameter of the case bearing coupling portion 127 is smaller than the diameter of the gear fixing portion 126. [

Conventionally, the rear wheel shafts of the vehicle four-wheel transfer device have usually been manufactured by cutting the bar-shaped members.

Korean Patent Publication No. 10-2007-0007657 (published Jan. 16, 2007) Korean Patent Registration No. 10-1410111 (issued on June 25, 2014)

However, in the case of manufacturing the rear wheel axle by cutting the bar-shaped member as in the prior art, not only the material cost is increased but also the production is difficult and the production cost is increased.

In addition, since the rear axle of the vehicle four-wheel transfer apparatus according to the prior art is poor in mechanical properties, durability is deteriorated and weight is heavy, so that it is difficult to manage components such as transportation and storage, There was a problem.

SUMMARY OF THE INVENTION The present invention has been made to solve the problems of the prior art described above, and it is an object of the present invention to provide a method of manufacturing a pipe material by molding a pipe material through a multi-step forging process, The present invention is to provide a method for manufacturing a rear wheel shaft of a four-wheeled vehicle transfer device for a vehicle, which is capable of producing a rear wheel shaft of a four-wheeled vehicle transfer device having a compact structure and excellent mechanical properties as a whole by forging.

In order to achieve the above-mentioned object, a method of manufacturing a rear wheel shaft of a four-wheeled vehicle transfer apparatus according to the present invention includes: a pipe material cutting step of cutting a pipe to a length required for product molding; A forging step of cold-forging the cut pipe material a plurality of times to form each part; A step of cutting a hole and a groove which can not be formed in the forging step; A heat treatment step of improving the corrosion resistance and strength of the rear wheel shaft subjected to the cutting process; And a grinding step of precision polishing the joining parts with other parts.

The method for manufacturing a rear wheel shaft of a four-wheeled vehicle transfer device according to the present invention is characterized in that the forging step includes a first forging to form a nut fastening part; A second forging to form a drive gear engaging spline portion; A third forging to form the driving gear fixing portion; A fourth forging to form the gear fixing portion and the case bearing coupling portion; A fifth forging to form a flange joint spline; And a sixth forging to form the drive gear engagement spline.

A method for manufacturing a rear wheel shaft of a four-wheeled vehicle transfer apparatus according to the present invention is characterized in that the forging is a cold forging process for inserting a mandrel in a pipe-like material through a forging press or the like and then pressing the pipe material between the pair of molds .

In the method of manufacturing a rear wheel shaft of a four-wheel drive transfer device according to the present invention, the heat treatment step is characterized in that the rear wheel shaft formed through the forging step and the cutting step is nitrided or homogenized.

In the method for manufacturing a rear wheel shaft of a four-wheel drive vehicle according to the present invention, the heat treatment step for the nitriding treatment in the heat treatment step may include a temperature raising step of raising the temperature to about 500 ° C to 520 ° C by heating in a nitriding furnace in a nitrogen gas atmosphere; A nitriding step of nitriding the product which has undergone the cutting step in the nitriding furnace after heating the heated product for 150 to 180 minutes; And a cooling step of cooling the interior to room temperature by nitriding again after the nitriding step.

In the method for manufacturing a rear wheel shaft of a four-wheeled vehicle transfer device according to the present invention, the heat treatment step for the homo treatment in the heat treatment step may include a pre-charging step of removing foreign substances adhering to the surface of the rear wheel shaft in a forging step or a cutting step; A step of charging a plurality of rear axles which have undergone a preliminary step, into a homo; A homo preheating step in which the inner temperature is heated from 340 ° C to 360 ° C with the homo, and this state is continued for about 30 minutes to activate the surface of the rear wheel shaft; A step of adding water vapor for 15 to 30 minutes into the homo, while the homo furnace is further heated by the homo to the inner temperature of the homo to be about 540 ° C to 560 ° C; A cooling step of firstly cooling the rear wheel shaft on which the oxide film is formed to approximately 120 DEG C to 150 DEG C in a nitrogen gas atmosphere, and then air-cooling the secondary shaft; And a post-cleaning step of preventing foreign matter from being formed on the surface of the cooled rear wheel shaft 120. [

In the method for manufacturing a rear wheel shaft of a vehicle four-wheel transfer apparatus according to the present invention, the rear wheel axle subjected to the forging step and the cutting step is inserted into a cleaning liquid, and the surface of the rear wheel shaft is cleaned by vibrating the cleaning liquid with an ultrasonic vibrator .

According to the method for manufacturing a rear wheel shaft of a four-wheeled vehicle transfer apparatus according to the present invention, material cost can be reduced by manufacturing a rear wheel shaft by cold forging a pipe material in a plurality of stages. By forging, the structure is dense and the overall mechanical properties It becomes possible to manufacture an excellent rear wheel shaft.

Further, according to the method for manufacturing a rear wheel shaft of a vehicle four-wheel transfer apparatus according to the present invention, it is possible to manufacture a rear wheel shaft having a very high dimensional accuracy through forging, so that a portion of a bearing- It is not necessary to perform the cutting process, and productivity and cost reduction can be achieved.

Further, according to the method for manufacturing a rear wheel shaft of a vehicle four-wheel transfer apparatus according to the present invention, it is possible to manufacture a rear wheel shaft having a light weight, thereby facilitating parts management and handling, thereby reducing costs.

1 is a front view of a vehicle four-wheel transfer apparatus according to the present invention,
Fig. 2 is a perspective view of a rear axle of the four-wheel drive transfer device,
3 is a vertical cross-sectional view of the vehicle four-wheel transfer device,
4 is an overall process diagram of a method for manufacturing a rear wheel shaft of a vehicle four-wheel transfer device according to the present invention,
5 is a forging process diagram of a method for manufacturing a rear wheel shaft of a vehicle four-wheel transfer apparatus according to the present invention,
6A is a first forged example of a forging step of a method of manufacturing a rear wheel shaft of a vehicle four-wheel transfer apparatus according to the present invention,
6B is a second forged example of a forging step of the method for manufacturing a rear wheel shaft of a vehicle four-wheel transfer apparatus according to the present invention,
6C is a third forged example of the forging step of the method for manufacturing the rear wheel shaft of the vehicle four-wheel transfer apparatus according to the present invention,
FIG. 6D is a fourth forged example of a forging step of a method of manufacturing a rear wheel shaft of a vehicle four-wheel transfer apparatus according to the present invention,
6E is a fifth forged example of the forging step of the method for manufacturing the rear wheel shaft of the vehicle four-wheel transfer apparatus according to the present invention,
6F is a sixth forging example of the forging step of the method for manufacturing the rear wheel shaft of the vehicle four-wheel transfer apparatus according to the present invention,
Fig. 7 and Fig. 8 are heat-process steps of a method for manufacturing a rear wheel shaft of a vehicle four-wheel transfer apparatus. Fig.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method of manufacturing a rear wheel shaft of a four-wheeled vehicle transfer device according to the present invention will now be described in detail with reference to the accompanying drawings.

In the following, the terms "upward", "downward", "forward" and "rearward" and other directional terms are defined with reference to the states shown in the drawings.

4 is an overall process diagram of a method for manufacturing a rear wheel shaft of a vehicle four-wheel transfer device according to the present invention.

The method for manufacturing a rear wheel shaft of a four-wheeled vehicle transfer device according to the present invention includes a pipe material cutting step, a forging step, a cutting step, a heat treatment step, and a grinding step.

The pipe material cutting step is a step of cutting a pipe having a predetermined diameter to a length necessary for product molding.

5 is a forging process diagram of a method of manufacturing a rear wheel shaft of a vehicle four-wheel transfer apparatus according to the present invention.

The forging step is a step of cold forging the pipe material several times.

In the first forging of the forging step, the nut fastening portion 122 is formed. For the second forging, the drive gear engaging spline portion 124 is formed. For the third forging, the driving gear fixing portion 125 is formed. In the forging, the gear fixing portion 126 and the case bearing engaging portion 127 are formed.

Further, the flange joint splines are formed in the fifth forging, and the drive gear engagement splines are formed in the sixth forging.

FIG. 6A is a first forged example of a forging step of a method for manufacturing a rear wheel shaft of a vehicle four-wheel transfer apparatus according to the present invention, and FIG. 6B is a sectional view of a forging step 6C is a third forged example of a forging step of a method of manufacturing a rear wheel shaft of a vehicle four-wheel transfer apparatus according to the present invention, and Fig. 6D is a front view of a rear wheel shaft manufacturing Figure 4 is a fourth forging example of a forging step of the method,

6F is a fifth forging example of a forging step of the method for manufacturing a rear wheel shaft of a vehicle four-wheel transfer apparatus according to the present invention, and FIG. 6F is a fifth forging example of a forging step of the method for manufacturing a rear wheel shaft of a four- Fig. 5 is a fifth monotonous example,

The forging in the forging step is preferably performed by cold forging in which a pipe material is pressed between a pair of metal molds after a mandrel is inserted into a pipe-shaped material through a forging press machine or the like.

When the rear-wheel shafts 120 are formed by cold forging in multi-stages using the pipe-shaped material, the material cost is reduced as compared with the conventional rear-wheel shafts.

In addition, due to the forging process, the structure is dense, the overall mechanical properties are excellent, and the dimensional accuracy is very high. Therefore, it is unnecessary to perform cutting processing separately except for the parts requiring very high precision. And the transportation cost for delivery to the customer is also reduced.

The cutting process is performed by a pin coupling hole of the nut coupling part 122 which can not be formed in the forging step, a groove between the flange coupling spline part 123 and the driving gear engagement spline part 124, a gear fixing part 126 And a groove or the like between the case bearing engaging portions 127 is machined.

Figs. 7 and 8 are process charts of a heat treatment process of the rear wheel shaft manufacturing method of the vehicle four-wheel transfer device.

The heat treatment step is a step for nitriding or homogenizing the formed product through the forging step and the cutting step.

The heat treatment step for the nitriding treatment in the heat treatment step may include a temperature raising step of raising the temperature to about 500 ° C to 520 ° C by heating in a nitriding furnace in a nitrogen gas atmosphere; A nitriding step of nitriding the product which has undergone the cutting step in the nitriding furnace after heating the heated product for 150 to 180 minutes; And a cooling step of cooling the interior to room temperature by nitriding again after the nitriding step.

In the nitriding step of the nitriding step, the ammonia gas is pyrolyzed by the catalytic action of the surface of the product heated to 500 ° C or higher, and the generated nitrogen source is adsorbed on the surface of the product to form a nitrided layer while diffusing into the interior.

The thickness of the nitrided layer formed on the surface of the product in the nitriding step is approximately 12 to 22 占 퐉. The nitrided layer is porous formed through the nitriding to improve the surface hardness of the product, improve the wear resistance and improve the corrosion resistance do.

Since the surface of the rear wheel shaft 120 having the nitrided layer formed through the nitriding step is greatly improved in the hardness compared with the surface of the general structural steel member, excessive contact with other parts throughout the service period of the rear wheel shaft 120 There is no fear of abrasion, and the service life of the rear axle 120 can be extended.

In the nitriding process, nitriding layers can be formed simultaneously on the surfaces of several tens to several hundreds of the rear wheel shafts 120 when the size of the nitriding furnace is appropriately designed, so that the nitriding process is also effective in productivity.

The heat treatment step for the homo treatment in the heat treatment step forms an oxide film formed on the entire surface of the rear wheel shaft 120 by iron oxide.

The heat treatment step for the homo treatment includes a pre-charging step, a homo charging step, a homo preheating step, a water vapor charging step, a cooling step, and a post-cleaning step.

In the step of forming the heat treatment step for the homo treatment, the rear wheel shaft 120 having undergone the forging step and the cutting step is placed in the cleaning liquid, and the surface of the rear wheel shaft 120 to be formed by vibrating the cleaning liquid with the ultrasonic vibrator is cleaned The foreign substances adhering to the surface of the rear wheel shaft 120 are removed in the forging step or the cutting processing step.

In the homo-charging step, a plurality of rear axles 120 having been subjected to a pre-charging step are sealed in a homo-in-situ state, and in the homo-preheating step, the inner temperature of the homo is increased from 340 ° C to 360 ° C This state is maintained for about 30 minutes in the heated state to activate the surface of the rear wheel shaft 120.

In this state, the steam is introduced into the homo-furnace for 15 to 30 minutes while the homo furnace is further heated by the homo-furnace so that the inner temperature becomes about 540 ° C to 560 ° C, A thin oxide film of 2 mu m to 3 mu m is formed on the surface of the rear wheel shaft 120 through ionic bonding between the shaft 120 and water vapor, and the cooling step is performed after the water vapor charging step is completed.

In the cooling step, the rear wheel shaft 120 having the oxide coating formed thereon is first cooled firstly in a nitrogen gas atmosphere to about 120 ° C to 150 ° C and then secondarily air-cooled. At this time, the rear wheel shaft 120, The reason for cooling is that the bonding strength between the oxide film and the inside of the oxide film is lowered when the inside of the oxide film is oxidized before the oxide film is completely dried.

The homo processing is completed by cleaning the rear axle 120 after completion of the cooling step in the same manner as the pre-cleaning step in the post-cleaning step so that no foreign matter is formed on the surface of the rear axle 120 that has been manufactured.

In the case of the oxidation film formed through such a homo treatment, the rear axle 120 according to the present invention having such an oxide film is also not corroded during the use period, and at the same time, Wear of the bearing contact surface due to long-term contact with the bearing can also be effectively suppressed.

Also, in the method for manufacturing a rear wheel shaft of a four-wheel drive vehicle according to the present invention, the heat treatment step may be a complex heat treatment step in which a homo treatment is further performed after nitriding treatment. After the process, the homo processing is performed again.

When a homo process is performed after the nitriding process, a thin oxide film having a thickness of about 1 μm to 2 μm is formed as an oxide layer on the surface of the nitriding layer forming the diffusion layer. The oxide film has a double hardness It becomes more advantageous in terms of hardness.

The grinding step is for correcting warpage such as deformation which may be caused by the heat treatment step and for increasing the surface roughness of the joint portion between the bearing contact surface and other parts such as the sealing member contact surface.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments.

Therefore, the embodiments disclosed in the present invention are not intended to limit the scope of the present invention but to limit the scope of the present invention.

The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

120: rear wheel shaft
122: nut fastening portion
123: flange joint spline portion
124: driving gear engaging spline portion
125: drive gear fixing portion
126: Gear fixing portion
127: Case bearing coupling part

Claims (7)

A pipe material cutting step of cutting the pipe to a length necessary for product molding;
A forging step of cold-forging the cut pipe material a plurality of times to form each part;
A step of cutting a hole and a groove which can not be formed in the forging step;
A heat treatment step of improving the corrosion resistance and strength of the rear wheel shaft subjected to the cutting process;
And a grinding step of precision polishing the joining portion with other parts;
Wherein the forging step comprises:
A first forging to form the nut fastening portion 122;
A second forging to form the drive gear engaging spline portion 124;
A third forging to form the drive gear fixing portion 125;
A fourth forging to form the gear fixing portion 126 and the case bearing engagement portion 127;
A fifth forging to form a flange joint spline;
And a sixth forging to form a drive gear engagement spline,
The forging is a cold forging for inserting a mandrel in a pipe-like material through a forging press and then pressing the pipe material between the pair of metal molds,
Wherein the heat treatment step includes nitriding or homogenizing the rear wheel shaft formed through the forging step and the cutting step,
In the heat treatment step for the nitriding treatment in the heat treatment step,
A heating step of heating in a nitriding furnace in a nitrogen gas atmosphere to raise the temperature to about 500 ° C to 520 ° C;
A nitriding step of nitriding the product which has undergone the cutting step in the nitriding furnace after heating the heated product for 150 to 180 minutes;
And a cooling step of cooling the interior to room temperature by nitriding again after the nitriding step,
In the heat treatment step for the homo treatment in the heat treatment step,
A pre-casting step of removing foreign substances adhering to the surface of the rear wheel shaft 120 in a forging step or a cutting step;
A step of loading the plurality of rear axles 120 having been subjected to the preliminary steps into a homo,
A homo preheating step in which the inner temperature is heated from 340 ° C to 360 ° C as a homo, and this state is continued for 30 minutes to activate the surface of the rear wheel shaft 120;
A step of adding water vapor for 15 to 30 minutes into the homo, while the homo furnace is further heated by the homo to the inner temperature of the homo to be about 540 ° C to 560 ° C;
A cooling step of firstly cooling the rear wheel shaft 120 having an oxide coating formed thereon in a nitrogen gas atmosphere from 120 ° C to 150 ° C, and secondarily cooling the rear wheel shaft 120;
And a post-cleaning step of preventing foreign matter from being formed on the surface of the cooled rear wheel shaft (120)
The pre-charging step includes cleaning the surface of the rear wheel shaft 120 to form a coating by swinging the rear wheel shaft 120 having been subjected to the forging step and the cutting processing step into a cleaning liquid and vibrating the cleaning liquid with the ultrasonic vibrator;
The thickness of the nitride layer formed on the surface of the product in the nitriding step is 12 탆 to 22 탆, is porous formed through iron nitride,
A porous oxide film of 2 mu m to 3 mu m is formed on the surface of the rear wheel shaft 120 through ionic bonding between the rear wheel shaft 120 and the water vapor in the step of applying water vapor,
The diameter of the flange engagement spline portion 123 is larger than the diameter of the nut engagement portion 122 and the diameter of the drive gear engagement spline portion 124 is larger than the diameter of the flange engagement spline portion 123, The diameter of the drive gear fixing portion 125 is larger than the diameter of the drive gear engagement spline portion 124 and the diameter of the gear fixing portion 126 is smaller than the diameter of the drive gear fixing portion 125, Wherein a diameter of the case bearing engagement portion (127) is smaller than a diameter of the case bearing engagement portion (127). delete delete delete delete delete delete
KR1020150034858A 2015-03-13 2015-03-13 Rear shaft maufacturing methde for 4 wheel drive vehicle's transfer apparatus KR101816082B1 (en)

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KR101816082B1 true KR101816082B1 (en) 2018-01-08

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101206742B1 (en) * 2011-06-27 2012-11-30 현대위스코 주식회사 Manufacturing meathod of hollow shaft for transmission
KR101249341B1 (en) * 2012-11-21 2013-04-09 임대규 A drum type washing machine and manufacturing method thereof

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100680783B1 (en) 2005-07-11 2007-02-08 기아자동차주식회사 Shift mechanism for transfer case
KR101410111B1 (en) 2012-11-28 2014-06-25 현대다이모스(주) Four-wheel drive type transfer apparatus capable of front-wheel driving

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101206742B1 (en) * 2011-06-27 2012-11-30 현대위스코 주식회사 Manufacturing meathod of hollow shaft for transmission
KR101249341B1 (en) * 2012-11-21 2013-04-09 임대규 A drum type washing machine and manufacturing method thereof

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