KR20140024080A - Universal joint for vehicle and manufacturing method thereof - Google Patents

Universal joint for vehicle and manufacturing method thereof Download PDF

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Publication number
KR20140024080A
KR20140024080A KR1020120089724A KR20120089724A KR20140024080A KR 20140024080 A KR20140024080 A KR 20140024080A KR 1020120089724 A KR1020120089724 A KR 1020120089724A KR 20120089724 A KR20120089724 A KR 20120089724A KR 20140024080 A KR20140024080 A KR 20140024080A
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KR
South Korea
Prior art keywords
joint
shaft
heat treatment
pipe
universal joint
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KR1020120089724A
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Korean (ko)
Inventor
김홍근
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주식회사 드림텍
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Priority to KR1020120089724A priority Critical patent/KR20140024080A/en
Publication of KR20140024080A publication Critical patent/KR20140024080A/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
    • B21J5/02—Die forging; Trimming by making use of special dies ; Punching during forging
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K1/00—Making machine elements
    • B21K1/76—Making machine elements elements not mentioned in one of the preceding groups
    • B21K1/762—Coupling members for conveying mechanical motion, e.g. universal joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K7/00—Making railway appurtenances; Making vehicle parts
    • B21K7/12—Making railway appurtenances; Making vehicle parts parts for locomotives or vehicles, e.g. frames, underframes
    • 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
    • C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
    • C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
    • C23C8/24—Nitriding

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)

Abstract

The present invention relates to a universal joint for automobiles and a method of manufacturing the same that can maximize steering performance.
Universal joint manufacturing method for a vehicle of the present invention is a shaft joint molding step of molding the serration on the outside of the shaft portion after molding the shaft portion and the yoke portion integrally by inserting the material into the die and pressurized plastic deformation with a punch; A heat treatment step of performing heat treatment on the shaft portion of the shaft joint; Processing a connection hole to connect another component to the yoke portion of the shaft joint after the heat treatment process is completed;
A pipe joint molding step of inserting another material into a die and pressing plastically deforming with a punch to form the pipe part and the yoke part in an integrated manner, and then forming a spline in the pipe part; A heat treatment step of performing heat treatment on the pipe portion of the pipe joint; After the heat treatment process is completed, the present invention provides a method for manufacturing a universal joint for a vehicle including a process of processing a connection hole to connect another part to a yoke portion of a pipe joint.
The heat treatment process of the shaft portion uses an ion nitriding heat treatment, and the heat treatment process of the pipe portion uses an oxynitride heat treatment.

Description

Universal joint for automobile and its manufacturing method {UNIVERSAL JOINT FOR VEHICLE AND MANUFACTURING METHOD THEREOF}

The present invention relates to a universal joint for automobiles and a method for manufacturing the same, and more particularly, to a universal joint for automobiles and a method for manufacturing the same, which can maximize steering performance.

Generally, the vehicle is provided with a steering device for the driver to adjust the traveling direction of the vehicle.

The steering apparatus is installed in front of the driver's seat and the steering wheel for changing the driving direction of the vehicle by the driver's operation, the steering column is installed in the lower portion of the steering wheel, and converts the rotational movement of the steering wheel into a straight motion and At the same time includes a gearbox for changing the direction of the tire to increase the steering force, and a universal joint for transmitting the rotational force transmitted to the steering column to the gearbox.

The universal joint is composed of a shaft joint and a pipe joint assembled in a state capable of transmitting a rotating torque while being slip-movable to the shaft joint.

A serration is formed in the longitudinal direction of the outer circumferential surface of the shaft joint, and a spline corresponding to the serration is formed inside the pipe joint, and the shaft joint is connected to the pipe joint by gear coupling so as to transmit rotational torque in the axial direction. The slip can be moved.

Each end of the shaft joint and the pipe joint is provided with a yoke portion having a fixed hole to connect another joint such as a spider, and the yoke portion of the shaft joint to which each spider is assembled is assembled to a steering column and the pipe joint The yoke of is connected to the gearbox.

In this automobile universal joint, cold forging is used, and the shaft joint and the pipe joint are molded into a structure in which each yoke portion is integrally formed.

As such, prior arts of a universal joint for automobiles in which yokes are formed integrally are disclosed in Korean Patent Laid-Open Nos. 10-2006-0116099 and 10-2011-0045311.

The prior art forms a shaft joint and a pipe joint in which a yoke portion is integrally formed by inserting a material having a predetermined length and outer diameter into a die serving as a mold and pressing plastic deformation with a punch.

And the shaft joint and the pipe joint thus manufactured can perform the heat treatment necessary for maintaining the strength.

At this time, since the yoke part is made relatively thin and the fixing hole is formed, it may cause deformation or cracks during the heat treatment process. Therefore, it is preferable to heat-treat only the pipe part and the shaft part except the yoke part. Do.

The shaft joint and pipe joint manufactured in this way are used by assembling each other.The ball slip is assembled on the spline of the shaft joint so that the shaft joint and the pipe joint can slip smoothly and smoothly. It can also be assembled to a joint.

In the heat treatment process, a nitriding layer is formed on the pipe by performing gas soft nitriding on the pipe joint, and a carburizing heat treatment is formed on the shaft on the shaft joint to form a carburized hardened layer.

However, the gas soft nitriding treatment as described above may undergo oxidation, and the carburization heat treatment has a potential problem of stress corrosion cracking (SCC).

Due to these disadvantages, the universal joint is inferior in lubricity and, accordingly, the friction of the ball slip is increased, thereby reducing the steering performance of the handle.

The present invention has been proposed to solve the conventional problems as described above, an object of the present invention is to provide a universal joint for automobiles and a method of manufacturing the same that can maximize steering performance.

In the universal joint manufacturing method for automobiles proposed by the present invention, a shaft joint forming step of inserting a material into a die, pressing plastically deforming with a punch, molding the shaft portion and the yoke portion integrally, and then forming a serration outside the shaft portion ; A heat treatment step of performing heat treatment on the shaft portion of the shaft joint; Processing a connection hole to connect another component to the yoke portion of the shaft joint after the heat treatment process is completed;

A pipe joint molding step of inserting another material into a die and pressing plastically deforming with a punch to form the pipe part and the yoke part in an integrated manner, and then forming a spline in the pipe part; A heat treatment step of performing heat treatment on the pipe portion of the pipe joint; After the heat treatment process is completed, the present invention provides a method for manufacturing a universal joint for a vehicle including a process of processing a connection hole to connect another part to a yoke portion of a pipe joint.

The heat treatment process of the shaft portion and the heat treatment process of the pipe portion uses nitriding heat treatment. The heat treatment process of the shaft portion uses an ion nitriding heat treatment, and the heat treatment process of the pipe portion uses an oxynitride heat treatment.

In the ion nitriding heat treatment step, a diffusion layer is formed on the surface of the base material forming the shaft portion, and a nitride layer is formed on the surface of the diffusion layer.

The diffusion layer has a thickness of 0.3 to 0.4 mm, and the nitride layer has a thickness of 5 to 8 μm.

In the oxynitride heat treatment step, a diffusion layer is formed on the surface of the base material constituting the pipe portion, a nitride layer is formed on the surface of the diffusion layer, and an oxide layer is formed on the surface of the nitride layer.

The diffusion layer has a thickness of 0.3 to 0.6 mm, the nitride layer has a thickness of 10 to 25 µm, and the oxide layer has a thickness of 1 to 2 µm.

In addition, the present invention is made of a yoke portion and the shaft portion formed to be connected to the steering column of the vehicle integrally the shaft joint formed on the outer peripheral surface of the shaft portion; In the universal joint for automobiles comprising a pipe joint having a spline-formed pipe portion and a yoke portion connected to the gearbox of the steering apparatus to one side of the pipe portion so that the shaft portion of the shaft joint can be slip-moved to the inside. ,

A compound layer is formed on a surface of a shaft portion of the shaft joint, and a pipe joint surface of the pipe joint is provided with a universal joint for automobiles.

In addition, the present invention is made of a yoke portion and the shaft portion formed to be connected to the steering column of the vehicle integrally the shaft joint formed on the outer peripheral surface of the shaft portion; A pipe joint having a spline-formed pipe portion and a yoke portion connected to a gearbox of a steering apparatus on one side of the pipe portion so that the shaft portion of the shaft joint may be coupled to the shaft to be slip-movably therein;

In the universal joint for automobile comprising a ball slip or needle bearing provided between the serration and the spline of the shaft joint and pipe joint,

A compound layer is formed on a surface of a shaft portion of the shaft joint, and a pipe joint surface of the pipe joint is provided with a universal joint for automobiles.

The compound layer is made of a Nitrogen-based ceramic film, and the tetraoxide layer is made of an oxide-based ceramic film.

Universal joint for automobile according to the present invention and a method for manufacturing the same according to the present invention, Nitrogen-based ceramic membrane and Oxide-based ceramic membrane produced by performing ion nitridation heat treatment and oxynitride heat treatment, respectively, on the shaft portion of the shaft joint and the pipe portion of the pipe joint Can be formed to maximize lubricity. For this reason, the steering coefficient of the handle can be improved by lowering the coefficient of friction during slip movement of the shaft and the pipe.

1 is a view of a state in which the molding of the shaft joint is completed in order to explain the universal joint for automobiles according to the present invention.
2 is a view for explaining a state in which the heat treatment is completed in the shaft portion in FIG.
3 is a view showing a state in which the molding of the pipe joint is completed to explain the universal joint for automobiles according to the present invention.
4 is a view for explaining a state in which the heat treatment is completed in the pipe unit in FIG.
5 is a view for explaining a state in which the shaft joint and the pipe joint of the universal joint for automobiles according to the present invention.
6 is a view for explaining that the slip member is provided between the shaft joint and the pipe joint of the universal joint for automobiles according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the accompanying drawings.

1 and 2 are views for explaining a shaft joint constituting a universal joint for automobiles according to the present invention, Figures 3 and 4 are views for explaining a pipe joint constituting a universal joint for automobiles according to the present invention. 5 is a view illustrating a state in which a shaft joint and a pipe joint of the universal joint for automobiles according to the present invention are assembled.

In order to manufacture the universal joint of the present invention, first, the shaft joint molding process of pressing and plastically deforming the material with a punch provided in a direction corresponding to each of the dies while sequentially moving the dice sequentially installed by a conveying device (not shown). 1 to form the serration 110 in the shaft portion 100, as shown in Figure 1, to form a shaft joint (S) consisting of the shaft portion 100 and the yoke portion 200 integrally.

Since the molding of the shaft joint S may be formed using a conventional cold multi-forging method, a detailed description thereof will be omitted.

When the molding of the shaft joint (S) is completed, when the ball slip (B) is inserted into the serration 110 of the shaft part 100, the snap ring at the end of the shaft part 100 to fix it. The fixing part 120 may be formed.

The snap ring fixing part 120 may be formed by using forging or cutting.

Then, after the shaft joint S is molded, the shaft part 100 is further subjected to a heat treatment process so as to increase durability, wear resistance, and surface hardness of the serration 110.

The heat treatment process of the shaft portion 100 may use a nitriding heat treatment that diffuses activated nitrogen to the surface of the shaft portion 100 to form a high-hardness nitride layer, and ionic nitriding heat treatment may be used among the nitriding heat treatments. The ion nitriding heat treatment can be performed by a conventional method.

Due to the ion nitriding heat treatment, the compound layer 130, which is a nitride layer, is formed on the surface of the base material constituting the shaft portion 100. The compound layer 130 may increase surface hardness while improving corrosion resistance. The compound layer is made of a Nitrogen-based ceramic film.

The compound layer 130 includes a diffusion layer 130a and a nitride layer 130b formed on the surface of the diffusion layer 130a.

Due to the diffusion layer 130a and the nitride layer 130b, the toughness of the shaft part 100 may be improved, and the SCC (Stress Corrosion Cracking) phenomenon that may occur in the conventional carburizing heat treatment may be fundamentally prevented. Can be.

That is, due to the heat treatment, fine pores are formed on the surface of the nitride layer 130b, and grease used for assembling when the universal joint is mounted and used in the vehicle penetrates into the porous layer of the oxide-based ceramic formed on the upper surface of the universal joint. , Oilless (Oilless) role to satisfy the sliding force value has excellent durability, wear resistance.

The thickness of the diffusion layer 130a in the above is preferably formed to 0.3 to 0.4mm. If the thickness of the diffusion layer 130a is less than 0.3 mm, there is a problem affecting the torsional torque value, and even if the thickness of the diffusion layer 130a exceeds 0.4 mm, there is no additional disadvantage, but to form a high thickness. A lot of time is spent on cost. Therefore, the thickness of the diffusion layer 130a is preferably formed to 0.3 to 0.4mm.

In addition, the thickness of the nitride layer 130b is preferably formed to 5 to 8㎛. If the thickness of the nitride layer 130b is less than 5 μm, abrasion resistance may occur. If the thickness of the nitride layer 130b exceeds 8 μm, a dimensional expansion problem may occur for a precision product. Therefore, the thickness of the nitride layer 130b is preferably formed to 5 to 8㎛.

As such, when the heat treatment is completed on the shaft part 100, the connection hole 210 is formed at both ends of the yoke part 200 to connect another joint such as a spider to the yoke part 200 of the shaft joint S. Machining of the connection hole 210 may be formed using a conventional cutting method.

In addition, the outer surface of the serration 110 formed on the shaft part 100 of the shaft joint S may be coated with a thin film of plastic material. When this process is completed, the manufacture of the shaft joint (S) is completed.

Meanwhile, the pipe joint P assembled with the shaft joint S may be manufactured through a separate process.

That is, as shown in FIG. 3, a pipe joint forming step is performed in which the raw materials are pressurized and plastically deformed with a punch provided in a direction corresponding to each of the dice while sequentially moving dies sequentially installed by a transfer device (not shown). While forming the spline 310 corresponding to the serration 110 of the shaft joint S at 300, the pipe joint P integrally formed with the pipe part 300 and the yoke part 400 is formed. .

Since the molding of the pipe joint P may be formed by a conventional cold multi-forging method, a detailed description thereof will be omitted.

When the molding of the pipe joint P is completed, the spline 310 corresponding to the serration 110 formed on the shaft part 100 of the shaft joint S is formed in the pipe part 300.

The spline 310 may be separately formed inside the pipe part 300, and the inside of the spline 310 may be molded into a spline 310 shape while forming the pipe part 300.

When the molding of the pipe joint (P) is completed as described above is fixed to form the fixing groove 320 along the circumferential surface of the pipe joint (P) to assemble with the shaft joint (S) manufactured above to fix it to the fixed body Groove processing is performed. Processing of the fixing groove 320 can be formed by a conventional cutting process.

When the pipe joint P is formed and processed as described above, the pipe part 300 is further subjected to a heat treatment process to prevent corrosion of the spline 310 and to increase corrosion resistance.

The heat treatment process of the pipe part 300 may use a nitriding heat treatment that diffuses activated nitrogen on the surface of the pipe part 300 to form a high hardness nitride layer, and may also use an oxynitride heat treatment among the nitriding heat treatments. The oxynitride heat treatment can be performed by a conventional method.

Due to the oxynitride heat treatment, tetraoxide layer 330 is formed on the surface of the base material constituting the pipe part 300. Due to the tetraoxide layer 330, the corrosion resistance is improved, thereby improving the surface hardness. The tetraoxide layer 330 is formed of an oxide ceramic layer.

The tetraoxide layer 330 includes a diffusion layer 330a, a nitride layer 320b formed on the surface of the diffusion layer 330a, and an oxide layer 330c formed on the surface of the nitride layer 330b.

Due to the tetraoxide layer 330 composed of the diffusion layer 330a, the nitride layer 330b, and the oxide layer 330c, high corrosion resistance is provided by preventing corrosion of the pipe part 300, and at the same time, durability, wear resistance, and surface hardness are provided. It can increase.

That is, due to the heat treatment, grease penetrates into the fine pores formed in the nitride layer 330b and the oxide layer 330c, and thus may serve as a bearing without a separate oil supply.

The thickness of the diffusion layer 330a is preferably formed to 0.3 to 0.6mm. If the thickness of the diffusion layer 330a is less than 0.3mm, problems such as a decrease in tensile strength and fatigue resistance shorten the life, and if the thickness of the diffusion layer 330a exceeds 0.6mm, the heat treatment time is required to increase the manufacturing cost. . Therefore, the thickness of the diffusion layer 330a may be formed to be 0.3 to 0.6 mm.

In addition, the thickness of the nitride layer 330b is preferably formed to 10 to 25㎛. If the thickness of the nitride layer 330b is less than 10 μm, the wear resistance may be degraded. If the thickness of the nitride layer 330b exceeds 25 μm, a dimension may be expanded for a precision product. Therefore, the thickness of the nitride layer 330b is preferably formed to 10 to 25㎛.

In addition, the oxide layer 330c preferably has a thickness of 1 to 2 μm. If the thickness of the oxide layer 330c is less than 1 μm, since the oxide layer is hardly formed or formed at all, the wear resistance is poor. If the thickness of the oxide layer 330c exceeds 2 μm, the heat treatment time is required to increase the manufacturing cost. Therefore, the thickness of the oxide layer 330c is preferably formed to 1 to 2㎛.

As such, when the heat treatment is completed in the pipe part 300, a connection hole 410 is formed at both ends of the yoke part 400 to connect another joint such as a spider to the yoke part 400 of the pipe joint P. Machining of the connection hole 410 may be formed using a conventional cutting method. When this process is completed, the manufacture of the pipe joint (P) is completed.

The shaft joint S and the pipe joint P manufactured through the above process are assembled by inserting one side of the shaft joint S in one axis of the pipe joint P as shown in FIG. 5. The shaft joint S and the pipe joint P thus assembled are in a state in which the serration 110 and the spline 310 are slip-movable in the axial direction while transmitting rotational torque.

In addition, the slip member B may be provided between the serration 110 and the spline 310 of the shaft joint S and the pipe joint P as shown in FIG. 6 so as to smoothly move the slip in the axial direction. The slip member B may have a ball slip, a needle bearing, or a mixture thereof.

The assembled universal joint for automobile is assembled to the steering column constituting the steering device of the vehicle by connecting another joint such as a spider to the connection hole 210 formed in the yoke portion 200 of the shaft joint (S), pipe joint The connection hole 410 formed in the yoke portion 400 of (P) may be used by assembling other joints such as spiders to a gearbox constituting a steering device of an automobile.

In this case, the shaft portion 100 of the shaft joint S and the pipe portion 300 of the pipe joint P may include a compound layer 130 made of a Nitrogen-based ceramic film formed by heat treatment, and a tetraoxide layer made of an oxide-based ceramic film ( Each of the 330 is formed to maximize lubrication, and thus, the steering coefficient of the handle may be improved by lowering the coefficient of friction during slip movement of the shaft part 100 and the pipe part 300.

While the preferred embodiments of the present invention have been described for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.

S: Shaft Joint P: Pipe Joint
100: shaft portion 110: serration
120: snap ring fixing portion 130: compound layer
130a: diffusion layer 130b: nitride layer
200, 400: yoke portion 210, 410: connection hole
300: pipe portion 310: spline
320: fixed hole 330: tetraoxide layer
330a: diffusion layer 330b: nitride layer
330c: oxide layer B: slip member

Claims (11)

A shaft joint molding step of inserting a raw material into a die and pressing and plastically deforming with a punch to form the shaft part and the yoke part in an integrated manner, and then forming a serration outside the shaft part;
A heat treatment step of performing heat treatment on the shaft portion of the shaft joint;
Processing a connection hole to connect another component to the yoke portion of the shaft joint after the heat treatment process is completed;
A pipe joint molding step of inserting another material into a die and pressing plastically deforming with a punch to form the pipe part and the yoke part in an integrated manner, and then forming a spline in the pipe part;
A heat treatment step of performing heat treatment on the pipe portion of the pipe joint;
Processing a connection hole to connect another component to the yoke portion of the pipe joint after the heat treatment process is completed;
Universal joint manufacturing method for automobile comprising a. The method according to claim 1,
The heat treatment process of the shaft portion and the pipe portion is a universal joint manufacturing method for a vehicle, characterized in that using the nitriding heat treatment. The method according to claim 2,
The heat treatment of the shaft portion uses an ion nitriding heat treatment process, the heat treatment of the pipe portion is a universal joint for automobile, characterized in that using an oxynitride heat treatment process. The method according to claim 3,
The ion nitriding heat treatment process is a universal joint manufacturing method for a vehicle, characterized in that to form a diffusion layer on the surface of the base material constituting the shaft portion, and to form a nitride layer on the surface of the diffusion layer. The method of claim 4,
The thickness of the diffusion layer is 0.3 to 0.4mm, the thickness of the nitride layer is a universal joint for automobile, characterized in that formed in 5 to 8㎛. The method according to claim 3,
The oxynitride heat treatment step of forming a diffusion layer on the surface of the base material constituting the pipe portion, the nitride layer is formed on the surface of the diffusion layer, and the oxide layer is formed on the surface of the nitride layer. The method of claim 6,
The thickness of the diffusion layer is 0.3 to 0.6mm, the thickness of the nitride layer is formed from 10 to 25㎛, the thickness of the oxide layer is a universal joint manufacturing method for automobiles, characterized in that formed. A shaft joint in which a serration is formed on an outer circumferential surface of the shaft part while the yoke part and the shaft part configured to be connected to the steering column of the vehicle are integrally formed;
In the universal joint for automobiles comprising a pipe joint having a spline-formed pipe portion and a yoke portion connected to the gearbox of the steering apparatus to one side of the pipe portion so that the shaft portion of the shaft joint can be slip-moved to the inside. ,
The compound joint is formed on the surface of the shaft portion of the shaft joint, the pipe joint surface of the pipe joint is a universal joint for automobiles. The method according to claim 8,
The compound layer is made of a Nitrogen-based ceramic film, the tetraoxide layer is a universal joint for automobiles, characterized in that made of an oxide-based ceramic film. A shaft joint in which a serration is formed on an outer circumferential surface of the shaft part while the yoke part and the shaft part configured to be connected to the steering column of the vehicle are integrally formed;
A pipe joint having a spline-formed pipe portion and a yoke portion connected to a gearbox of a steering apparatus on one side of the pipe portion so that the shaft portion of the shaft joint may be coupled to the shaft to be slip-movably therein;
In the universal joint for automobile comprising a ball slip provided between the serration and the spline of the shaft joint and pipe joint,
The compound joint is formed on the surface of the shaft portion of the shaft joint, the pipe joint surface of the pipe joint is a universal joint for automobiles. The method of claim 10,
The compound layer is made of a Nitrogen-based ceramic film, the tetraoxide layer is a universal joint for automobiles, characterized in that made of an oxide-based ceramic film.
KR1020120089724A 2012-08-16 2012-08-16 Universal joint for vehicle and manufacturing method thereof KR20140024080A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104889225A (en) * 2015-05-18 2015-09-09 雄华机械(苏州)有限公司 Trimming blanking machine
CN105234708A (en) * 2015-10-29 2016-01-13 马鞍山动力传动机械有限责任公司 Clamp for milling end faces and drilling center holes in two ends of spline shaft fork type parts
KR101872249B1 (en) * 2017-03-08 2018-06-28 주식회사 코우 Manufacturing method of pipe joint of universal joint for vehicle

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104889225A (en) * 2015-05-18 2015-09-09 雄华机械(苏州)有限公司 Trimming blanking machine
CN105234708A (en) * 2015-10-29 2016-01-13 马鞍山动力传动机械有限责任公司 Clamp for milling end faces and drilling center holes in two ends of spline shaft fork type parts
KR101872249B1 (en) * 2017-03-08 2018-06-28 주식회사 코우 Manufacturing method of pipe joint of universal joint for vehicle

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