KR100995343B1 - Bellows assembly method of steering system for car - Google Patents

Abstract

The present invention relates to a method for assembling a bellows of a vehicle steering apparatus, wherein the bellows provided for maintaining watertightness between the gearbox and the tie rod of the vehicle steering apparatus and an assembly (rack housing) to which the bellows are assembled are subjected to electrical resistance welding and the like. The purpose is to shorten the assembly time of the product to improve the assembly and productivity.

The technical configuration is to form a plurality of ribs on the inner peripheral surface of the assembly end of the bellows provided in the form of a corrugated tube elastically stretchable in the axial direction, and the assembly ends of the bellows with the lip formed on the outer peripheral surface of the assembly to be assembled After fitting the steel band so that the assembly end of the bellows can be fixed on the assembly to be fixed to the outside of the assembly, the lip is melted so that the inside diameter of the assembly of the bellows adheres to the outside diameter of the assembly. To maintain.

Bellows, Lips, Assemblies (Rack Housings), Electric Resistance Welding

Description

Bellows assembly method of steering system for car}

1 is a cross-sectional view showing that the bellows is installed in the tie rod assembly of a conventional vehicle steering apparatus.

Figure 2 is an exploded cross-sectional view showing a separation state before assembling the bellows applied to the present invention.

Figure 3 is a cross-sectional view showing a state after the bellows assembly according to the assembly method of the present invention.

<Description of Signs for Major Parts of Drawings>

100 ... bellows

110 ... assembly 112

200 ... P Assembled 210 ... Mounting groove

300 ... steel band

The present invention relates to a method for assembling the bellows of a vehicle steering device, in particular, after forming a lip in the inner diameter of the assembly of the bellows provided for maintaining watertightness between the gearbox and the tie rod of the vehicle steering device, electric resistance welding during assembly By dissolving the lip to make the assembling end of the bellows join with the assembling part of the assembly to be assembled, the watertightness of the bellows fastening part is improved, and the assembling property of the bellows is improved as a simple assembling method as well as the production according to the assembly of the product. The present invention relates to a bellows assembling method of a steering device for a vehicle to lower a unit cost.

BACKGROUND ART In general, a vehicle steering apparatus includes a steering wheel provided in a driver's seat, a steering shaft provided at a lower side thereof, and a gear box connected to the steering shaft to reduce the rotational force transmitted from the steering wheel and to change the power transmission direction. It is done by

Here, the gear box is a rack bar in the interior of the hollow housing provided in the axial direction is configured to switch the rotational force from the steering shaft to the horizontal movement, a pair of rack bar at both ends to be linked to this The tie rod of the inner ball joint is connected to the tire wheel side of both sides of the vehicle is configured to change the wheel.

At this time, the inner side of the inner ball joint portion in which the tie rod and the rack bar interlocked in the axial direction are covered with bellows to prevent penetration of moisture and dust from the outside.

1 is a cross-sectional view showing that the bellows is installed on the inner ball joint portion outside the tie rod and the rack bar in the conventional vehicle steering apparatus as described above.

As shown in the figure, the outer end of the rack housing 1 and the middle end of the tie rod 3 cover the rack bar 2 and the tie rod 3, which are moved in the axial direction, to the inside of the rack housing 1. Bellows 5 are installed to prevent foreign substances such as moisture or dust from penetrating.

Such bellows (5) is provided in the form of a corrugated pipe so that the rack bar (2) and tie rods (3) can be expanded and contracted as they move in the left and right axial direction, the larger diameter portion 52 of both ends is a rack It is fixed by a steel band 6 wrapped around and fastened from the outside in a state where it is fitted to the outer peripheral surface of the front end of the housing 1, and a small diameter portion 54 having a relatively small diameter at the other end is formed on a groove formed on the outer peripheral surface of the tie rod 3. It is fixed by a clip 7 that wraps around and fastens it at its outer side in a fitted state.

Here, in order to increase the watertightness between the bellows and the to-be-assembly when assembling the bellows, the sealing adhesive 8 is disposed between the inner diameter of the bellows assembly, that is, the large diameter portion 52 or the small diameter portion 54 and the outer diameter of the assembly. Or (Fig. 1a), or the grooved portion was installed in the O-ring (9) after the bellows (5) to be fitted to the outside.

However, in the former (FIG. 1A) of the bellows assembling method, the watertightness is maintained by applying a coating material such as the sealing adhesive 8 to the outer circumferential surface of the assembly to which the bellows is assembled as much as the contact area of the bellows. There was a problem that the productivity is lowered, and after the assembly, the sealing adhesive 8 protrudes to the outside of the assembly site, thereby lowering the merchandise.

In the latter method (Fig. 1b) of the bellows assembly method, the O-ring (90) had to process a separate groove in the outer diameter of the assembly to be installed. Had a problem.

The present invention has been made in view of various problems according to the conventional bellows assembly method as described above, and after forming a lip in the inner diameter of the assembly of the bellows provided for maintaining watertightness between the gearbox and the tie rods. By dissolving the lip by electric resistance welding during assembly, the assembly of the bellows is joined to the assembly of the assembly to be assembled, thereby improving the assembly of the bellows and lowering the production cost according to the assembly of the product as a simple assembly method. It is an object of the present invention to provide a method for assembling bellows of a vehicle steering apparatus.

As a technical means for achieving the above object, the present invention, a plurality of ribs are formed on the inner peripheral surface of the assembly portion of the bellows provided in the form of a corrugated pipe expandable in the axial direction, the assembly portion of the bellows formed with the lip outer peripheral surface of the assembly Fitting the steel band so that the assembly of the bellows can be fixed on the assembly to be fixed at the outside of the assembly of the bellows in the assembled state of the bellows. By providing a method for assembling the bellows of the vehicle steering apparatus characterized in that the watertightness can be maintained by bonding to the outer diameter.

In particular, the lip is characterized in that the steel band and the assembly to be melted by using an electrical resistance welding connected to the (+) (-) electrode, respectively.

Alternatively, the lip may be melted by contacting a high temperature electric heater outside the steel band and then heating the electric heater.

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

2 is an exploded view showing a separation state before assembling the bellows applied to the present invention, and with reference to FIG. 2, the bellows assembling method applied to the present invention will be described.

First, a plurality of ribs 112 are formed on the inner circumferential surface of the assembly end 110 of the bellows 100 that is provided in a corrugated pipe form in the axial direction. At this time, the lip 112 is a thermoplastic material, it is preferable to be molded integrally with this in the initial manufacturing step of the bellows that is usually produced by injection processing.

Next, a mounting groove 110 formed on the outer circumferential surface of the assembly end 110 of the bellows 100 in which the lip 112 is formed as described above is illustrated and described as a rack housing end as the assembly; After fitting so as to be positioned on the 210, the bellows 100 is fitted on the mounting groove 210 of the assembly 200 by fitting the steel band 300 to fix the bellows 100 outside the assembly end 110. The assembly end 110 of the to be fixed.

Thereafter, when the lip 112 is melted by applying heat to the bellows assembly end 110, the inner diameter of the assembly end 110 of the bellows 100 is adhered to the outer diameter of the assembly 200 to maintain watertightness.

In particular, it is preferable to use electric resistance welding as a method of melting and bonding the lip 112 as described above. That is, the steel band 300 and the assembly 200 as a base material, respectively, after connecting the (+) (-) electrode through the current, the bellows assembly end 110 and the assembly 200 by the electrical resistance Heat is generated in between, so that the lip 112 of the thermoplastic material is melted, and the melted lip 112 serves as a joint between the bellows and the assembly as shown in FIG. 3.

On the other hand, as another method, a high-temperature electric heater (not shown) in contact with the outside of the steel band 300 may be heated to melt the lip 112.

That is, when the electric heater of high temperature is in contact with the steel band 300 and then heated, the heated heat indirectly heats the bellows 100 through the steel band 300, thereby melting the lip 112.

Therefore, the assembly method of the present invention can improve the assemblability and productivity of the product since it is not necessary to apply a separate adhesive or install an O-ring as in the past to maintain the watertightness between the bellows and the assembly to be assembled.

As described above, according to the method of assembling the bellows of the vehicle steering apparatus for a vehicle according to the present invention, after forming a lip in the inner diameter of the assembly of the bellows, the assembly of the bellows is assembled by simply dissolving the lip by electric resistance welding or the like during assembly. By joining the parts, as well as improving the assembly of the bellows, as a simple assembly method it is possible to significantly reduce the assembly time and production cost according to the product assembly.

Claims (3)

A plurality of ribs 112 are formed on the inner circumferential surface of the assembly end 110 of the bellows 100 provided in the form of a corrugated pipe elastically in the axial direction. The steel band 300 is fitted to the outside of the assembly end 110 of the bellows 100 in a state where the assembly end of the bellows 100 having the lip 112 is fitted to the outer circumferential surface of the assembly 200 to be fitted. After allowing the assembly end 110 of the bellows 100 to be fixed on the 200, Melting the lip (112) is assembled to the inner end of the bellows 100 (110) inner diameter is bonded to the outer diameter of the assembly 200 to maintain the water tightness, characterized in that the bellows assembly method for a vehicle steering apparatus. The method of claim 1, The lip is a bellows assembly method of the vehicle steering apparatus, characterized in that the melting by using electric resistance welding connected to the steel band 300 and the assembly 200, respectively (+) (-) electrodes. The method of claim 1, The lip is a bellows assembly method of a vehicle steering apparatus, characterized in that for heating the bellows indirectly heated through the steel band by contacting the electric heater of the high temperature outside the steel band (300).

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