KR102053467B1

KR102053467B1 - Structure for mounting steering gear box

Info

Publication number: KR102053467B1
Application number: KR1020140135523A
Authority: KR
Inventors: 이후광
Original assignee: 현대자동차주식회사
Priority date: 2014-10-08
Filing date: 2014-10-08
Publication date: 2019-12-06
Also published as: KR20160041484A

Abstract

The present invention relates to a structure that prevents the steering gearbox assembly torsion by directly fastening the steering gearbox to the cross member.
The present invention implements a gearbox assembly method of a new structure in which a steering gearbox is directly connected (solid mounting) using a mounting adapter capable of flattening the gearbox seat height through machining and a mounting pipe into which the gearbox is press-fitted, thereby eliminating the rubber bush. It provides a steering gearbox mounting structure that can reduce the cost, as well as prevent the assembly deformation of the gearbox housing.

Description

Structure for mounting steering gear box

The present invention relates to a steering gearbox mounting structure, and more particularly to a structure that prevents the steering gearbox assembly torsion by fastening the steering gearbox directly to the cross member.

Generally, a steering device is a device for changing a driving direction of a vehicle, and includes a steering wheel, a steering gearbox, a pitman arm, a drag link, a tie rod, a steering knuckle, and the steering device is mechanical and power depending on the operation method. It is divided into power steering and the like.

Such a steering device is a steering gear mechanism for transmitting a driver's operating force to a steering gear mechanism, a steering gear mechanism for changing a direction of a steering wheel operating force and increasing a rotational force and transmitting the steering gear mechanism to a steering link mechanism. It is composed of steering link mechanism that transmits movement to the front wheel and keeps the front wheels on the left and right at the same time.

Here, the steering gear mechanism includes a steering gear box for accommodating the rack gear, pinion gear, etc., such steering gear box is installed in the vehicle body, that is, the four-member support structure.

For example, as shown in FIG. 4, two gearbox mounting seating surfaces 110a, 110b, 110c, and 110d are formed on the left and right sides of the cross member 100, respectively, and each gearbox mounting seating surface 110a is formed. After the four bolt fastening portions of the gearbox housing (not shown) are set to, 110b, 110c, and 110d, they are installed in a structure that is fastened by each stud bolt (not shown).

That is, as shown in Figure 5, the mounting pipe 120 is installed in a welding structure on the gearbox mounting seating surface (110a, 110b, 110c, 110d) of the cross member 100, the bolt of the gearbox housing 130 As the stud bolt 140 is fastened directly to the threaded portion 150 of the mounting pipe 120 while passing through the fastening portion, or fastened with the rubber bush 160 interposed therebetween, the steering gearbox is mounted on the cross member. The point support structure can be installed.

However, the front wheel cross member assembled using arc welding is fine in the left and right gearbox mounting seats with long mounting spans (left and right 536mm) due to the characteristics that thermal deformation occurs even when the assembly is restricted by a strong jig and assembled. There is nothing else.

This height difference causes bending and torsional deformation in the gearbox housing made of aluminum die-casting material when the gearbox four-point solid is fastened, thereby increasing friction with the rack bush inside the gearbox housing, thereby deteriorating steering related performance.

This phenomenon occurred as a field frame in a conventional mass production vehicle.

In order to solve the height step problem, the current gearbox mounting structure applies two rubber bushes to the left and right sides to replace the gearbox deformation due to the height step with the rubber deformation.

However, the cost rise due to the application of the rubber bush, and also need to ensure the minimum thickness of the gearbox housing in which the rubber bush is press-fitted, the area of the fastening portion is increased (diameter 10mm or more) and disadvantages in terms of layout.

Background art of the present invention is disclosed in US Pat. Nos. US5251932, US6149197, US4314710 and the like.

Accordingly, the present invention has been made in view of the above, and a new structure for directly coupling (solid mounting) a steering gearbox using a mounting adapter capable of flattening the gearbox seat height through machining and a mounting pipe into which it is press-fitted. By implementing the gearbox assembly method of the, the purpose is to provide a steering gearbox mounting structure that can reduce the cost of eliminating the rubber bush as well as prevent the assembly deformation of the gearbox housing.

Steering gearbox mounting structure provided by the present invention to achieve the above object has the following features.

The steering gear box mounting structure is a structure for mounting the gearbox housing on the mounting seat provided on the cross member, the mounting pipe is installed on the mounting seat of the cross member inward, the upper surface of the mounting seat is coupled to the upper end of the mounting pipe The mounting adapter is installed, and the bolt coupling part of the gearbox housing is positioned on the upper surface of the mounting adapter, and the bolt coupling part and the stud bolt passing through the mounting adapter are fastened to the screw portion of the mounting pipe.

Here, the mounting adapter may be coupled to the mounting pipe in a structure in which the mounting adapter is press-fitted into the adapter groove at the top of the mounting pipe.

In addition, the mounting adapter may be made of the same aluminum material as that of the gearbox housing.

In a preferred embodiment, the mounting adapters installed on each mounting seat of the cross member may make the left and right heights of the top of each mounting adapter the same height through the top machining.

In a preferred embodiment, the mounting adapter coupled to the mounting pipe and installed on the mounting seat may be subjected to electrodeposition coating before machining to smooth the seat height.

The steering gearbox mounting structure provided by the present invention has the following advantages.

First, cost savings can be achieved by deleting rubber bushes.

The mounting space of the mounting adapter made of the same material as the gearbox housing is the same space as the gearbox housing volume of the existing solid mounting conditions, so there is no additional material cost.

However, the processing cost is increased according to the machining of the mounting adapter upper part before the gearbox assembly, but the roughing speed is low due to the rough grinding of the low-strength aluminum material, and the increase in processing cost is minimal.

Second, there is no assembly deformation of the gearbox housing while the solid mounting structure is applied, and thus, deterioration of the merchandise, such as loss of steering force and deterioration of steering feeling, may be eliminated.

In addition, it is possible to eliminate the possibility of stiffness degradation due to the lateral load that can be reduced when applying the bush mount can further increase the lateral rigidity of the front wheel compared to the rubber bush specification.

Third, the rubber bush can be removed (mounting space is the same as a conventional solid mounting gearbox), which is advantageous in terms of layout.

In addition, it is possible to freely design the shape of the cross member in which the left and right mount surfaces are formed only in the plane due to the difficulty in managing the flatness of the left and right left surfaces of the cross members.

In the present invention, since the flatness of the left and right gearbox mounts can be adjusted through machining, it is possible to design a complex form of the seat.

This can increase the degree of freedom of shape design of the cross member to facilitate layout design.

Fourth, since the electrodeposition coating is performed after pressing the mounting adapter, there is no possibility of potential difference corrosion caused by the use of different materials between the cross member upper plate of the steel plate and the mounting adapter of the aluminum material, and rust does not occur, thereby improving aesthetics.

1 is a perspective view showing a cross member in which a gearbox housing is installed in a steering gearbox mounting structure according to an embodiment of the present invention;
Figure 2 is a cross-sectional view showing the gearbox housing assembly state in the steering gearbox mounting structure according to an embodiment of the present invention
3 is a cross-sectional view showing a gearbox housing seat height flattening method in a steering gearbox mounting structure according to an embodiment of the present invention;
4 is a perspective view of a cross member on which a steering gearbox is mounted;
5 is a cross-sectional view showing various examples of a mounting structure of a conventional steering gearbox.

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

1 is a perspective view illustrating a cross member in which a gearbox housing is installed in a steering gearbox mounting structure according to an embodiment of the present invention, and FIG. 2 is a gearbox housing in a steering gearbox mounting structure according to an embodiment of the present invention. It is sectional drawing which shows the assembling state.

As shown in Figure 1 and 2, the steering gearbox mounting structure is a structure that can solve the height step problem and reduce the cost by applying a mounting adapter and the height of the gearbox seat height flattening structure Is done.

For this purpose, a total of four mounting seats 11 are formed on the cross member 10 at two positions on the left and right sides, and the gearbox housing 13 is fastened by using the mounting seats 11 formed therein. Can be installed.

The mounting pipe 12 is vertically installed in the mounting seat 11 in the hole in the arc welding structure.

At this time, the adapter groove 18 is formed on the upper surface of the mounting pipe 12, the mounting adapter 16 can be coupled using this, the inner peripheral surface of the mounting pipe 12 is stud bolt (14) It may be made of a screw 15 for fastening.

In particular, the mounting adapter 16 is installed on the mounting seat 11, which is a place where the bolt fastening portion 17 of the gearbox housing 13 is placed.

At this time, the mounting adapter 16 is made of an integrated structure of the circular boss portion 16a and the flange portion 16b formed at the upper end of the boss portion.

Here, the mounting adapter 16 may be made of the same aluminum material as the gearbox housing 13 made of aluminum.

The mounting adapter 16 is installed in a structure that is coupled to the top of the mounting pipe 12.

For example, the mounting adapter 16 is installed in a structure that is press-fitted into the adapter groove 18 formed on the upper end surface of the mounting pipe 12 by using the boss portion 16a. Flange portion 16b of 16 is placed in a structure in close contact with the mounting seat surface (11).

Thus, the electrodeposition coating process can be performed in a state in which the mounting adapter 16 and the mounting pipe 12 are installed on the mounting seat 11 of the cross member 10.

That is, the electrodeposition coating treatment is performed on the entire cross member 10 including the mounting adapter 16 after the press-fit fixing of the mounting adapter 16 and before the following flattening is performed on the mounting adapter 16. .

This is to eliminate potential corrosion caused by the use of different materials between the cross member of the steel plate and the mounting adapter of the aluminum plate.

On the other hand, in order to eliminate the height step caused by the left and right long span of the gearbox mounting seat 11 can be carried out a flattening of the gearbox seat height.

To this end, as shown in FIG. 3, the upper machine for the mounting adapter 16 such that the left and right heights of the top of each mounting adapter 16 installed on each mounting seat 11 of the cross member 10 are the same. Machining can be carried out.

For example, after the electrodeposition coating, the machining of the appropriate depth, that is, the milling machine 19 so that the left and right heights of the four mounting adapters 16 are equal to each other while the cross member 10 is fixed to the jig (not shown). Machining using) makes the left and right heights of the gearbox seat the same.

As such, the gearbox mounting height of the cross member 10 in which the machining is completed does not have any error in left and right so that deformation due to torsion, bending, etc. does not occur at all when the gearbox is directly connected.

In order to mount the gearbox housing 13 substantially, the butt joint 17 of the gearbox housing 13 is mounted with the mounting adapter 16 with the flattened top height of each mounting adapter 16 through machining. It is placed on the upper surface of.

In addition, while the stud bolt 14 penetrates the bolt coupling part 17 and the mounting adapter 16 in turn, and the stud bolt 14 is fastened to the threaded part 15 of the mounting pipe 12, Installation of the gearbox housing by the stud bolt fastening structure is completed.

As such, the present invention adopts a mounting adapter and a mounting pipe processed to press-fit the mounting adapter, and the mounting adapter is disadvantageous in terms of cost and package by applying a structure to improve left and right height step by machining before gearbox assembly. The rubber mounting of the gearbox and the cross member can be improved by a solid fastening method that integrates some structures of the gearbox, thus reducing costs, increasing steering system lateral stiffness, preventing steering, and improving layout.

10: cross member
11: mounting seat
12: mounting pipe
13: gearbox housing
14: stud bolt
15: screw part
16: mounting adapter
16a: boss
16b: flange
17 bolt connection
18: adapter groove
19: milling machine

Claims

In the structure of mounting the gearbox housing 13 on the mounting seat 11 provided on the cross member 10,
The mounting pipe 12 is installed inward on the mounting seat 11 of the cross member 10, and a mounting adapter 16 coupled to the upper end of the mounting pipe 12 is installed on the top surface of the mounting seat 11. The stud bolt 14 penetrating the bolt coupling part 17 and the mounting adapter 16 in a state where the bolt coupling part 17 of the gearbox housing 13 is located on the upper surface of the mounting adapter 16 is provided. Steering gearbox mounting structure, characterized in that consisting of a structure that is fastened to the threaded portion 15 of the mounting pipe (12).

The method according to claim 1,
The mounting adapter (16) is a steering gearbox mounting structure, characterized in that coupled to the mounting pipe side in a structure that is press-fitted into the adapter groove (18) at the top of the mounting pipe (12).

The method according to claim 2,
The mounting adapter 16 is a steering gearbox mounting structure, characterized in that made of the same aluminum material as the gearbox housing material.

The method according to claim 1,
Mounting adapter 16 is installed on each mounting seat 11 of the cross member 10 is a steering gearbox mounting structure, characterized in that the left and right height of the top of each mounting adapter is the same through the top machining.

The method according to claim 1 or 4,
Mounting adapter (16) is installed on the mounting seat (11) and coupled to the mounting pipe (12) is a steering gearbox mounting structure, characterized in that the electrodeposition coating treatment before machining for flattening the seat height.