KR19980049820U - Structure of maintaining gap between column tube and column shaft of vehicle steering system - Google Patents

Abstract

The present invention relates to a column tube and column shaft holding structure of the vehicle steering apparatus, in order to improve the weakening of the elasticity and slip slip of the plastic bushing gap holding structure, the elastic outer peripheral surface at a certain position at a certain distance to the elastic yaw A cylindrical plastic bush 6 which forms a groove portion 10 and one side thereof is cut in the direction of the main surface to form an end portion 12 which is cut, while allowing the gap a to be elastically deformed to close and buffer the inside and the outside; In addition, a cylindrical elastic member is formed inside the plastic bush 6 to form several protrusions 14 therein so that the plastic bush 6 is radially resilient, thereby reducing the contact area and increasing the pressure. Interposed between the column shaft and the column tube to maintain the steering center of the column shaft, including the column tube and column shaft spacing structure of the new vehicle steering device that improves the play and noise generated during rotation of the column shaft Will be provided.

Description

Space between the tube and column shaft of the steering system.

The present invention relates to a column tube maintenance structure of the steering column (steering column) and the column shaft spacing structure, in particular interposed between the column shaft which is provided on the inner circumferential surface of the upper or lower portion of the column tube rotational force when the column wheel is rotated The outer part is in contact with the inner circumferential surface of the column tube and the inner part relates to the column tube and the column shaft keeping structure of the automobile steering apparatus, which allows sliding contact on the outer circumferential surface of the column shaft in order to ensure transmission without this clearance and noise.

In general, the steering device of the automobile is provided with a needle bearing for maintaining a constant circumferential diameter between the column tube and the upper inlet of the column tube directly below the steering wheel and the upper bracket side, so that the steering wheel rotates smoothly. In addition, the circumferential spacing with the inner side of the column has been kept constant without the play of the column shaft.

However, after a certain period of use, the needle rolls of the bearings wear out, resulting in play between the steering shaft and the support rubbers that support the needle bearings and provide elasticity to the column tubes. Rubber) also has a low elasticity and has generated noise by flowing the column shaft between the inner wall of the column tube.

On the other hand, in recent years, steering structures have been used to perform the above functions by adopting a plastic bush which has almost the function of the needle bearing and has a simple structure and a low production cost, but in the case of using only the plastic bush, There was a problem that the gap holding power for catching the play due to the repeated rotation of the steering shaft was low, and the noise generation rate was high due to the characteristics of the plastic.

Therefore, the gap between the column tube and the column shaft having the advantages of the plastic bush while maintaining a constant elasticity so that there is almost no center movement during steering operation by overcoming the disadvantages of the structural complexity of the needle bearing and the problems of the plastic bush at the same time. Retention structures have been needed.

The present invention provides a means for maintaining the gap between the column tube and the column shaft, which overcomes the structural complexity of the conventional needle bearing and simplifies the structure and improves the production cost and the life thereof, while reducing the disadvantage of the elastic weakening of the plastic bush. Has its purpose.

1 is a schematic view showing a connection structure of a column tube, a bracket and a universal joint of a conventional vehicle steering device

2 is an enlarged view illustrating main parts of FIG. 1;

3 is an exploded perspective view of a column tube and a column shaft in which the present invention is carried out

Figure 4a is a plan view of the assembled state of the present invention

4b is a plan view of the present invention plastic bush

Figure 5 is a cross-sectional view of the present invention mounted on the column tube and column shaft

Explanation of symbols on the main parts of the drawings

2: column tube, 4: column shaft, 6: plastic bush, 8: elastic member,

10: elastic groove, 12: incision end, 14: protrusion, 16: elastic protrusion.

In order to achieve the object of the present invention, the space keeping structure of the column tube and the column shaft of the steering device of the present invention is interposed between the column shaft and the column tube to cut a cylindrical main surface to prevent the play of the column shaft. A plastic bush having a gap therebetween so as to be bufferable; It is provided with a carbushing means that is fitted inside the plastic bush and is impacted to cause the plastic bush to radially resilient.

Such a space-keeping structure of the present invention provides a space keeping means that improves the problem of simply interposing a space keeping means having weak adhesion and strength between the column tube and the column shaft. Slip force and considerable resilience by roll are provided.

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

3 is an exploded perspective view of a corresponding part of the column tube and the column shaft in which the present invention is implemented, and FIG. 4A shows the elastic range (a) in a state in which a leaf spring is mounted on the plastic bush applied to the present invention, and FIG. It represents the elastic range of the initial setting of the plastic bush to be applied to the present invention.

According to this drawing, the space keeping structure for maintaining the space between the column tube 2 and the column shaft 4 of the present invention is a cylindrical cylinder (plastic bush) interposed between the column shaft 4 and the column tube 2. And 6) and an assembly structure of the bullet member 8 fitted therebetween.

Specifically, the plastic bush 6 forms a predetermined gap a so as to maintain the basic diameter after cutting along one main surface thereof, and allows the cylinder itself to be opened or buffered, and the elastic member 8 is the plastic bush 6. The inner side of the plastic bush (6) is made of a circular plate spring for causing the plastic bush to radially resilient, the plastic bush (6) of the present invention is a flexible groove portion 10 at regular intervals at a certain position on the radial outer peripheral surface (10) ) And one side is cut in the direction of the main surface to form a cut end 12, but the gap (a) is stretched and deformed so that the close and the inside and the buffer can be made possible.

The elastic member 8 is fitted inside the plastic bush 6 to form several protrusions 14 therein so that the plastic bush 6 is radially resilient, thereby reducing the contact area and increasing the pressure. As a cylindrical structure, a buffer groove 10 and a buffer protrusion 16 are formed to cushion a gap when the column tube 4 is opened or tightened in the circumferential direction when assembled with the column tube 4.

According to the present invention, the column member 2 and the column shaft 4 are brought into contact with the plastic bush 6 of the attached drawing 4b so that the gap a is opened in the state shown in FIG. 4a. The plastic bush 6 is mounted on the inner circumferential surface of the column tube 2 as the column shaft 8 urges the protrusion 14 of the elastic member 8 contacted by the column shaft 4 with the column shaft 4.

As shown in FIG. 5, the elastic member 8 applied to the present invention has a column shaft 4 by forming a protrusion 14 having a contact surface reduced in order to secure slip force and elasticity of the needle bearing as described above. The inner surface of the plastic bush 6 to be elastically applied by pressing, and at the same time, the contact surface with the column shaft 4 is brought into contact only with the protrusions 14, thereby reducing the contact surface, thereby reducing the slip with the column shaft 4. Make it good

The present invention made as described above has the complexity of the structure and assembly process due to the arrangement of the needle rolls having a method of mounting the needle roll between the column tube as a rubber member and reducing the rotational friction during steering rotation by the conventional needle roll. It is to provide a gap maintaining means to improve the gap and noise caused by the weakening of elasticity due to material and characteristic deformation due to contact frictional heat when used for a long time, such as the plastic bush type gap maintaining means, the column shaft By reducing the contact area with, reduce frictional force due to the entire contact of the outer circumferential surface to ensure more slip and improve the indirect elasticity by the rubber body by generating elasticity in the concentric circle by intermittent protrusions contacting the column shaft. Simply round leaf springs in the same plastic bush structure Only by adding a structure to improve the life compared to the conventional needle bearings, the manufacturing process and the number of parts is reduced to reduce the production cost.

Claims (1)

Cylindrical plastic that forms elastic grooves at regular intervals at a certain position on the radial outer circumferential surface, and one side is cut in the direction of the principal surface to form an incised end, but the gap (a) is elastically deformed to allow close and inner buffering and cushioning. bush; And, Interposed between the column shaft and the column tube, including; a cylindrical elastic member which is inserted inside the plastic bush to form a plurality of protrusions in the plastic bush to radially resilient to reduce the contact area and increase the pressure pressure; And maintaining the steering center of the column shaft.