KR101148485B1 - Shaft and Yoke Assembly - Google Patents

Abstract

The present invention relates to a shaft and yoke assembly, which has a concave bolted groove formed at an end along a circumferential direction and formed from an end portion from a bolted groove and a serration portion formed along an axial direction opposite to the end of the end from the bolted groove. A shaft having a flat surface portion positioned to an end thereof; A yoke having a serration hole formed at one side thereof and a bolt hole formed to communicate with the serration hole in a direction perpendicular to the serration hole; And a bolt inserted into the bolt hole of the yoke and passing through the bolt coupling groove of the shaft, thereby preventing misassembly when connecting the shaft and the yoke, and stress is concentrated in the bolt coupling groove after the complete assembly. It is to prevent the occurrence of unwanted accidents, as well as improve the reliability of the product.

Description

Shaft and Yoke Assembly

One embodiment of the present invention relates to a shaft and yoke assembly, and more particularly, in the case of being used in a steering device, a misassembly is required when connecting a shaft of a steering column or a gearbox and a yoke of an intermediate shaft made of a universal joint. In addition, the present invention relates to a shaft and yoke assembly which can be prevented, and to prevent stress concentration in the bolting groove after complete assembly.

Various devices are installed in the car to improve the safety of the car and the driver's convenience. Among them, the steering device is a device that allows the driver to turn the steering wheel freely to change the driving direction of the car. It is a device that assists the vehicle by moving the center of rotation in the desired direction.

In general, as shown in FIG. 1, when the driver rotates the steering wheel 1 in a desired direction, the shaft 5 of the steering column 2 connected to the steering wheel 1 rotates. The steering column 2 transmits the rotational force to the shaft 5 of the gearbox 4 composed of the rack and the pinion gear through the intermediate shaft 3 made of the universal joint.

The intermediate shaft 3, which is connected to the center of rotation of both shafts 5, generally comprises two yoke joints 6 and one slip joint 9 at both ends.

The yoke joint 6 is a joint means commonly used when two axes intersect at a constant angle, and is designed such that the angle of the two axes intersected at a constant angle may change during operation. ) Refraction is possible.

The yoke joint 6 is arranged so that two yokes 7 provided so that pins can be installed in a radial direction inside one end thereof are interlocked with each other, and a cross spider (not shown) is installed therebetween. Even when the angle is refracted, it is provided to transmit rotational force from the yoke of one side to the yoke of the other side.

The slip joint 9 transmits rotational force, but has a function of allowing the intermediate shaft 3 to be stretched by a force greater than or equal to a certain strength acting in the axial direction. In general, the slip joint 9 connected to the yoke joint 6 is divided into a pipe and a shaft so as to transmit rotational force and slip in the axial direction, and the pipe accommodates the shaft.

Meanwhile, the yoke joint 6 is connected to the shaft 5 of the steering column 2 or the shaft 5 of the gearbox 4, respectively. The coupling structure of the shaft 5 and the yoke 7 will be described in more detail. As shown in FIG. 2, a serration hole 71 and a bolt hole 72 are formed at one side of the yoke 7. The bolt hole 72 is formed to communicate with the serration hole 71 in a direction perpendicular to the serration hole 71.

Then, the end portion of the shaft 5 is inserted into the serration hole 71. At the end of the shaft 5, a serration portion 51 and a bolt coupling groove 52 are formed. The bolt coupling groove 52 is arcuate in cross section and is recessed in the outer circumferential surface along the circumferential direction. It is formed in the form. Moreover, the serration part 51 is formed by the predetermined length along the axial direction of the shaft 5 to both sides of the bolt engaging groove 52 in the outer peripheral surface of the edge part of the shaft 5, respectively.

When the end of the shaft 5, that is, the serration part 51 is completely inserted into the serration hole 71 of the yoke 7, and the bolt 8 is fastened to the bolt hole 72 of the yoke 7, The bolt 8 is coupled while passing through the bolt coupling groove 52 of the shaft 5, so that the end of the shaft 7 inserted into the serration hole 71 is not removed from the serration hole 71. By this, the assembly of the shaft 5 and the yoke 7 is completed.

However, when the bolt 8 is fastened in a state in which the serration portion 51 of the shaft 5 is not completely inserted into the serration hole 71 of the yoke 7, as shown in FIG. Since the coupling does not pass through the bolt coupling groove 52 of the shaft 5, the shaft 5 is not constrained by the bolt 8, whereby the end of the shaft 5 has a serration hole 71. You can get out of it.

When the shaft 5 and the yoke 7 are misassembled due to the incomplete fastening of the bolt 8 as described above, the shaft 5 comes out of the serration hole 71 of the yoke 7 while the vehicle is running. As a result, transmission of steering force through the intermediate shaft 3 or from the intermediate shaft 3 becomes impossible, which is a big problem that may eventually lead to an accident.

Accordingly, the present invention has been made to solve the above-described problems, the shaft and yoke assembly to prevent the misassembly when connecting the shaft and yoke, and to prevent the concentration of stress in the bolt coupling groove after complete assembly The purpose is to provide.

In order to achieve the above object, the shaft and yoke assembly according to the embodiment of the present invention has a concave bolting groove formed along the circumferential direction at an end thereof, and a serration formed along the axial direction from the bolting groove opposite to the end of the end portion. A shaft having a flat surface portion positioned from the portion and the bolt coupling groove to the end of the end portion; A yoke having a serration hole formed at one side thereof and a bolt hole formed to communicate with the serration hole in a direction perpendicular to the serration hole; And a bolt inserted into the bolt hole of the yoke and passing through the bolt coupling groove of the shaft.

As described above, according to the present invention, it is possible to prevent erroneous assembly when connecting the shaft and the yoke, and to prevent stress concentration in the bolted groove after fully assembling, thereby improving the reliability of the product and of course, It is effective to prevent the occurrence of an accident in advance.

1 is a view schematically showing a steering apparatus of a vehicle.
2 shows a shaft and yoke assembly according to the prior art.
3 is a view showing a state in which the shaft and yoke assembly according to the prior art is assembled incorrectly.
4 and 5 illustrate a shaft and yoke assembly according to an embodiment of the present invention.

Hereinafter, some embodiments of the present invention will be described in detail through exemplary drawings. In adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are assigned to the same components as much as possible even though they are shown in different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

In addition, in describing the component of this invention, terms, such as 1st, 2nd, A, B, (a), (b), can be used. These terms are intended to distinguish the constituent elements from other constituent elements, and the terms do not limit the nature, order or order of the constituent elements. If a component is described as being "connected", "coupled" or "connected" to another component, that component may be directly connected to or connected to that other component, but there may be another configuration between each component. It is to be understood that the elements may be "connected", "coupled" or "connected".

4 and 5 are views showing a shaft and yoke assembly according to an embodiment of the present invention, as shown in the shaft and yoke assembly according to an embodiment of the present invention, the end of the concave bolt along the circumferential direction A coupling groove 52 is formed, and the serration portion 51 is formed along the axial direction from the bolt coupling groove 52 to the opposite end of the end, and the flatness is located from the bolt coupling groove 52 to the end of the end. A shaft 5 having a surface portion 53; A yoke 7 having a serration hole 71 formed at one side thereof and a bolt hole 72 formed in communication with the serration hole 71 in a direction perpendicular to the serration hole 71; And a bolt 8 inserted into the bolt hole 72 of the yoke 7 and passing through the bolt coupling groove 52 of the shaft 5.

A bolt coupling groove 52 is formed at the end of the shaft 5, and the bolt coupling groove 52 is formed in an arc-shaped cross section and recessed in the outer circumferential surface along the circumferential direction. Moreover, the serration part 51 and the flat surface part 53 which comprise the main characteristics of this invention are formed in the circumference | surroundings of the bolt engaging groove 52 at the edge part of the shaft 5. The serration part 51 is formed by the predetermined length along the axial direction from the bolt engaging groove 52 to the opposite end of the end in the outer peripheral surface of the end of the shaft 5. On the contrary, the flat surface portion 53 is provided from the bolt coupling groove 52 to the end of the end portion at the outer circumferential surface of the end portion of the shaft 5, and the serration is not formed on the surface. At this time, the outer diameter of the flat surface portion 53 in which no serration is formed at the end of the shaft 5 may be smaller than the outer diameter of the serration portion 51.

A serration hole 71 and a bolt hole 72 are formed at one side of the yoke 7, and the bolt hole 72 communicates with the serration hole 71 in a direction perpendicular to the serration hole 71. It is formed to be. The serration in the serration hole 71 of the yoke 7 is formed in a predetermined length along the axial direction from the end of the opening toward the bolt hole 72 or more.

After the flat surface portion 53 at the end of the shaft 5 and the flat surface portion 53, the serration portion 51 is completely inserted into the serration hole 71 of the yoke 7, and then the When the bolt 8 is fastened to the bolt hole 72, the bolt 8 is coupled while passing through the bolt coupling groove 52 of the shaft 5, thereby inserting the bolt 8 into the serration hole 71. As the end of the shaft 7 does not come out of the serration hole 71, the assembly of the shaft 5 and the yoke 7 is completed.

On the other hand, one embodiment of the present invention has a configuration that can prevent the assembly of the shaft and yoke assembly, that is, as shown in Figure 5 of the serration hole 71 of the yoke (7) of the shaft (5) In the state where only the flat surface portion 53 at the end is inserted without inserting the serration portion 51, only the portion where no serration is formed is inserted, so that the shaft 5 has a serration hole 71 of the yoke 7. By being turned in, the operator can recognize that the shaft 5 is incompletely inserted into the serration hole 71 of the yoke 7.

Here, the end of the end from the bolted groove 52 at the end of the shaft 5 as a means for the operator to recognize the incomplete assembly of the shaft and the yoke assembly by causing the shaft 5 to drift in the yoke 7. While the serration portion is formed along the axial direction toward the side, the configuration in which the serration in the serration hole 71 of the yoke 7 is formed along the axial direction from the bolt hole 72 to the opposite end of the opening can be considered. In this case, stress is concentrated in the bolt coupling groove 52 formed at the expense of the thickness of the shaft 5, so that the strength becomes weak.

Accordingly, the serration portion 51 is formed along the axial direction from the bolt coupling groove 52 at the end of the shaft 5 to the opposite end of the end and the flat surface portion 53 from the bolt coupling groove 52 to the end of the end. The configuration according to an embodiment of the present invention can prevent the misassembly when connecting the shaft and the yoke, and at the same time, it can be an optimal configuration to prevent the concentration of stress in the bolt coupling groove after complete assembly. .

According to one embodiment of the present invention having such a structure and shape, it is possible to improve the reliability of the product as well as to prevent the occurrence of unwanted accidents in advance.

In the above description, all elements constituting the embodiments of the present invention are described as being combined or operating in combination, but the present invention is not necessarily limited to the embodiments. In other words, within the scope of the present invention, all of the components may be selectively operated in combination with one or more.

It is also to be understood that the terms such as " comprises, "" comprising," or "having ", as used herein, mean that a component can be implanted unless specifically stated to the contrary. But should be construed as including other elements. All terms, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, unless otherwise defined. Terms commonly used, such as terms defined in a dictionary, should be interpreted to coincide with the contextual meaning of the related art, and shall not be construed in an ideal or excessively formal sense unless explicitly defined in the present invention.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention but to describe the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

Shaft: 5 Yoke: 7
Bolt: 8 Serration: 51
Bolted groove: 52 Flat surface part: 53
Serration Hole: 71 Bolt Hole: 72

Claims (2)

A concave bolt engaging groove is formed in the end along the circumferential direction, and includes a serration portion formed along the axial direction from the bolt engaging groove to the opposite end of the end, and a flat surface portion located from the bolt engaging groove to the end of the end. With one shaft; A yoke having a serration hole formed at one side thereof and a bolt hole formed to communicate with the serration hole in a direction perpendicular to the serration hole; And a bolt inserted into the bolt hole of the yoke and passing through the bolt coupling groove of the shaft.
When assembling the shaft and the yoke, if the bolt is fastened to the bolt hole while only the flat surface portion of the shaft is inserted into the yoke, the shaft may turn around in the serration hole, and the operator may recognize misassembly. And a shaft and yoke assembly. The method of claim 1,
The outer diameter of the flat surface portion is smaller than the outer diameter of the serration portion shaft and yoke assembly.

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