WO2016035951A1

WO2016035951A1 - Torque transmitting apparatus for variable steering shaft of vehicle

Info

Publication number: WO2016035951A1
Application number: PCT/KR2015/001675
Authority: WO
Inventors: 권오훈; 김광래; 김남우
Original assignee: 태림산업(주)
Priority date: 2014-09-02
Filing date: 2015-02-23
Publication date: 2016-03-10

Abstract

The objective of the present invention is to provide a torque transmitting apparatus for a variable steering shaft of a vehicle, wherein the apparatus can accurately transmit strong torque which is applied to a ball in the circumferential direction due to frequent rotation effect (steering effect) of a torque transmitting apparatus, and durability can be improved by preventing ball or body (ball support hole) damage as a ball is configured to be supported by a support protrusion in the circumferential direction as well as in the longitudinal direction of the body, wherein the ball is installed in a way to be able to rotate in a designated place in a cylinder-shaped body to form a torque transmitting apparatus. In addition, the objective of the present invention is to provide a torque transmitting apparatus for a variable steering shaft of a vehicle, wherein the apparatus has support protrusions, formed at a cylinder-shaped body to form a torque transmitting apparatus, for supporting both sides of a ball in the circumferential direction, and outer support blocks, formed at both remaining sides of the ball, for supporting the ball in the longitudinal direction of the body, wherein neighboring support blocks are connected to each other such that the apparatus can accurately transmit torque which is applied to a ball in the circumferential direction due to rotation (steering effect) of a steering shaft and durability can be improved by preventing ball or body (ball support hole) damage, and in particular, the apparatus can sufficiently withstand against elastic force applied when the length of the steering shaft is adjusted.

Description

Torque transmission device of variable steering shaft for vehicle

The present invention relates to a torque transmission device for a variable steering shaft for a vehicle, and more particularly, a support protrusion on each side of the ball support hole for rotationally supporting the ball in the torque transmission device, preferably along the circumferential direction of the body, respectively. This allows the support protrusion to support the ball in the circumferential direction even if the torque generated when the steering shaft is rotated to change the direction of the vehicle is not only able to transmit the torque accurately, but also because of this torque The ball or ball support hole is to prevent the damage to increase the durability. In addition, the present invention constitutes a support protrusion on both sides of the body in the circumferential direction of the body with respect to the ball support hole for rotationally supporting the ball in the torque transmission device, even if the torque generated when rotating the shaft is concentrated on the ball in the circumferential direction It is possible to stably support the ball and transmit torque, and also to form an outer support block in the longitudinal direction of the body with respect to the ball support hole, and in particular to connect the adjacent outer support blocks to each other to stably adjust the length of the steering shaft. It was made possible.

In general, the steering wheel used for turning the vehicle is connected with the steering shaft between the steering gear box. At this time, the steering shaft rotates the gears in the steering gear box by the amount of rotation in which the driver rotates the steering wheel by hand to return the vehicle to the predetermined direction.

On the other hand, the length of the steering shaft is basically determined according to the vehicle type, but in recent years a variable steering shaft that can adjust the angle and length of the steering shaft based on the steering gear box in consideration of the driver's body shape (Telescopic) Steering Shaft) is used a lot. Patent Document 1 (Korean Patent No. 1404595) and Patent Document 2 (Korean Patent Publication No. 10-2010-0027449) disclose a technique related to a telescopic shaft capable of stretching the length of such a steering shaft.

Patent document 1 relates to a torque transmission device of a telescopic shaft of a steering apparatus of a vehicle having an inner shaft that slides with respect to each other along a common axis direction and a hollow outer shaft into which the inner shaft is inserted. Torque transmission of the telescopic shaft of the steering system of the vehicle, which is improved so that the steering load of the inner and outer shaft is kept constant at all times by regulating the deterioration of the operating feeling of the steering system as the sliding load of the inner and outer shafts becomes inconsistent with occurrence. To provide the device.

Patent document 2 relates to the telescopic bushing for implementing the telescopic function of the steering column of the vehicle. The telescopic bushing is for reducing the clearance between the inner jacket and the outer jacket of the telescopic steering column. The telescopic bushing has a cylindrical shape placed between the outer circumferential surface of the inner jacket and the inner circumferential surface of the outer jacket. A body, and a plurality of elastic members provided on the body to elastically support the body and the inner peripheral surface of the outer jacket.

However, the torque transmission device (bushing) mounted on the existing steering shaft (column) has the following problems.

(1) It was constructed in such a way that the ball was not supported on both parts of the (electric) ball part that transmitted torque as the variable steering shaft was rotated, that is, circumferentially with respect to the ball.

(2) When the ball is mounted on the torque transmission device (bushing), the ball is not supported in the circumferential direction, but only in the direction in which the torque transmission device (bushing) is inserted into the steering shaft (column). .

(3) However, although the torque transmission (bushing) is also important for length adjustment, it is more likely that the original function of the steering shaft (column), ie the vehicle will often rotate the steering wheel to change direction, such as turning left or right. Strong torque acts between the ball and the part that is in contact with the circumferential part of both sides with respect to the hole in which it is mounted.

(4) The torque applied in the circumferential direction acts as one factor that deforms the ball so that it cannot perform its original function or breaks the hole for mounting the ball, which in turn destroys the torque transmission device (bushing).

(5) In order to prevent breakage of the ball and the hole for mounting the ball, the thickness of the body constituting the torque transmission device (bushing) should be made thick or made of a stronger material.

(6) This not only requires a large cost to manufacture the torque transmission device (bushing) but also acts as one factor that increases the overall weight of the vehicle and consequently increases the fuel consumption of the vehicle.

(7) In addition, the portion formed in the longitudinal direction to support the ball acts as one factor of failing to secure the ball stably because it does not secure sufficient rigidity.

(8) In addition, when the steering shaft is stretched and contracted to the driver's body shape, the ball does not roll smoothly, and noise is generated when adjusting the length of the steering shaft.

The present invention has been invented in view of such a point, and the ball mounted to rotate in a predetermined position on the cylindrical body constituting the torque transmission device is supported by the support protrusion not only in the longitudinal direction of the body but also in the circumferential direction. It is possible to accurately transmit the strong torque that the ball receives in this circumferential direction by frequently rotating action (steering action) of the torque transmission device, and to prevent damage to the ball or the body (ball support hole). It is a first object to provide a torque transmission device for a variable steering shaft for a vehicle that can be improved.

In particular, the second object of the present invention is to provide a predetermined amount of oil, grease, and the like on the surface substantially in contact with the ball, such as the ball support hole and the outer support block, thereby preventing friction between the ball and the steering shaft. The present invention provides a torque transmission device for a variable steering shaft for a vehicle that can smoothly absorb the same, thereby suppressing generation of noise and allowing smooth steering operation.

In addition, the third object of the present invention is to produce an outer support block formed on both sides of the ball in the longitudinal direction of the body in a block shape of the polygonal front face shape, the elastic force generated when the variable steering shaft is stretched in the longitudinal direction The present invention also provides a torque transmission device for a variable steering shaft for a vehicle that enables the ball to sufficiently rotate stably.

The fourth object of the present invention is to form a support protrusion in the cylindrical body constituting the torque transmission device so as to support both sides of the ball in the circumferential direction, and to support the other side of the ball in the longitudinal direction of the body. By forming an outer support block so that adjacent support blocks are connected to each other, the ball or body (ball support hole) can be accurately transmitted as well as the torque received in the circumferential direction when the steering shaft is rotated (steering action). It is to provide a torque transmission device of a variable steering shaft for a vehicle that can prevent the breakage of the) to improve the durability, and in particular, to withstand the elastic force received when adjusting the length of the steering shaft.

Torque transmission device of a variable steering shaft for a vehicle according to the present invention for achieving this object, at least two grooves in the longitudinal direction so that the ball 111 is fitted into the double tube shape and the ball 111 is inserted into the face facing each other. A torque transmission device for a variable steering shaft for a vehicle mounted between an inner steering shaft (I) and an outer steering shaft (O) formed side by side, comprising a cylindrical body (100) having a predetermined thickness, wherein the body ( On the outer surface, at least two rows of holes 110 are formed on the outer surface at predetermined intervals side by side in the longitudinal direction of the body 100, and each of the holes rows 110 has at least two balls at predetermined intervals. Penetrates the support holes 112 and inserts the balls 111 so as to be rotatably supported; and on both sides of each ball support hole 112 on the outer surface thereof, respectively. By connecting between two adjacent ball support holes 112 along the circumferential direction of the die (100) and protruding to form a support projection 120 to support each ball 111 when it receives a force in the circumferential direction On both sides of the body 100 in the longitudinal direction with respect to each ball support hole 112, the outer end of each ball 111 is contacted with each ball 111 so as to be exposed to the outside so as to be rotatably supported. And protruding the outer support block 130 in the longitudinal direction so as not to be connected to each other in the middle of the adjacent ball support hole 112; ball on the inner surface corresponding to the respective outer support block 130 ( The inner support block 140 supporting the ball 111 in contact with the 111 is characterized in that the protrusion formed.

Torque transmission device of the variable steering shaft for a vehicle according to the present invention, at least two grooves (S1, S2) in the longitudinal direction so that the ball 111 is fitted into the double tube form and face each other can be rolled. In a torque transmission device for a variable steering shaft for a vehicle mounted between an inner steering shaft (I) and an outer steering shaft (O) formed side by side, a cylindrical body (100) having a predetermined thickness has a body (on its outer surface). At least two rows of hole rows 110 are formed at predetermined intervals side by side in the longitudinal direction of 100, and each of the hole rows 110 passes through at least two ball support holes 112 at predetermined intervals. Each of the balls 111 is rotated to support each other; and the two ball support holes 112 adjacent to each other along the circumference of the outer surface are connected to each other to force When the support protrusion 120 is formed to protrude so that it can be supported, the outer end of each ball 111 on both sides in the longitudinal direction of the body 100 around each ball support hole 112 to the outside Protruding an outer support block 130 so as to be in contact with each ball 111 so as to be exposed and rotatably exposed; and fits the ball 111 at a position corresponding to the outer support block 130 on an inner surface thereof; An inner support block 140 is formed to protrude to support the ball 111, and between the two outer support blocks 130 adjacent to each other along the longitudinal direction of the body 100, the two outer support blocks ( It is characterized in that made by connecting to the connecting portion 131 formed in a smaller size than 130.

In particular, each of the ball support holes 112 formed in the two hole rows 110 formed adjacent to each other is characterized in that they are formed to face each other on the virtual circumference formed in the body 100 or alternately formed.

In addition, the support protrusion 120 is characterized in that formed along the circumference between the adjacent ball support holes 112.

In addition, the outer support block 130 and the inner support block 140 is characterized in that each of the front shape is formed of a polygonal block.

Finally, an oil pocket 141 is further formed on the inner surface and the outer support block 130 of the ball support hole 112 in contact with the ball 111.

Torque transmission device of the variable steering shaft for a vehicle according to the present invention has the following effects.

(1) By further forming a support protrusion along this circumferential direction between the ball support holes formed adjacent to each other in the circumferential direction, this circumferential torque is applied to the ball as the steering shaft is turned to change the direction of the vehicle. The protrusions can be used to support the ball and transmit torque accurately.

(2) By distributing and supporting the torque applied to the ball in the circumferential direction, it is possible to prevent deformation of the ball and breakage of the ball support hole supporting the ball, thereby increasing the durability of the torque transmission device.

(3) In particular, not only can be easily manufactured with a simple configuration that forms a support protrusion to support the ball in the circumferential direction to transfer the torque to the surface of the body, but can also improve the durability of the torque transmission device while minimizing the manufacturing cost. You can expect the effect.

(4) By forming oil pockets to store a predetermined amount of oil or grease in the ball support hole and outer support block that rotates and directly contact with the ball so that the ball can be clouded well, When adjusting the length of the variable steering shaft, the ball smoothly rolls while lubricating between the shafts. This not only increases the durability by reducing the wear phenomenon between them, but also reduces the noise generated by friction between the components, thereby creating a comfortable driving environment.

(5) By forming the outer support block and the inner support block for supporting the ball in the longitudinal direction of the body in a polygonal shape, the formation area of the outer support block formed in the gap between the inner steering shaft and the outer steering shaft, that is, The contact area with the ball can be expanded to stably support the ball.

(6) As the contact area between the ball and the outer support block and the inner support block increases, the outer support block and the inner support block are stable to prevent deformation of the ball against the stretching force generated while adjusting the length of the shaft. Can be supported, thereby increasing the durability of the torque transmission device.

(7) Since the adjacent outer support blocks are connected to each other, the elastic force generated when adjusting the length of the variable steering shaft can be sufficiently supported by the outer support blocks connected to each other even if the elastic force is applied to the ball.

(8) It can prevent the deformation of the ball, the ball support hole for supporting the ball, and the deformation or breakage of the outer support block and the inner support block, thereby further increasing the durability of the torque transmission device.

1 is an exploded perspective view showing an example of the inner steering shaft to which the torque transmission device of the variable steering shaft for a vehicle according to the first embodiment of the present invention is applied.

FIG. 2 is a cross-sectional view for illustrating a coupling state between an inner steering shaft and an outer steering shaft constituting a steering shaft to which the torque transmission device according to Embodiment 1 of the present invention is applied; FIG.

3 is a perspective view for showing a state in which the ball is mounted in the ball support hole of the torque transmission device according to Embodiment 1 of the present invention.

Figure 4 is a front view for showing the configuration of the body according to the first embodiment of the present invention.

5 is an enlarged perspective view showing a part of a torque transmission device according to Embodiment 2 of the present invention.

6 is a perspective view for showing a state in which the ball is mounted in the ball support hole of the torque transmission device according to a third embodiment of the present invention.

7 is an enlarged perspective view showing a part of a torque transmission device according to Embodiment 4 of the present invention.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention. Prior to this, terms or words used in the specification and claims should not be construed as being limited to the common or dictionary meanings, and the inventors should properly define the concept of terms in order to best explain their invention. In accordance with the principle that it can be interpreted as meanings and concepts corresponding to the technical spirit of the present invention.

Therefore, the embodiments described in the specification and the configuration shown in the drawings are only the most preferred embodiment of the present invention and do not represent all of the technical idea of the present invention, various equivalents that may be substituted for them at the time of the present application It should be understood that there may be variations and variations.

Example 1

Torque transmission device of the variable steering shaft for a vehicle according to the first embodiment of the present invention, as shown in Figures 1 to 4, the body is made of a cylindrical shape and configured to support a plurality of balls (111) to rotate in a predetermined pattern ( And a support protrusion 120 to support the balls 111 in both circumferential directions with respect to each ball 111 in the body 100, in particular, for steering the vehicle. As the shaft rotates, the torque generated in the circumferential direction can be accurately transmitted while being able to withstand the strong torque sufficiently, as well as preventing damage to the ball 111 or the body 100.

In addition, the present invention is the outer support block 130 on both sides in the longitudinal direction of the body 100 based on the ball support holes 112 for supporting the ball 111 on the inner and outer surfaces of the body 100, respectively. By forming the inner support block 140 and), it is able to withstand the elastic force generated when adjusting the length of the steering shaft in the longitudinal direction with respect to the cylindrical body (100).

Hereinafter, this configuration will be described in more detail.

1 and 2, the torque transmission device according to the present invention is used in a variable steering shaft, the variable steering shaft is a double tube form, the inner steering shaft (I) is fitted to the outer steering shaft (O) length Configure to control. In addition, the grooves S1 and S2 are formed at predetermined intervals along the longitudinal direction on the surfaces of the inner steering shaft I and the outer steering shaft O that face each other, and these steering shafts I and O are respectively formed. Between the torque transmission device according to the present invention is inserted, the torque transmission device is inserted along the yaw grooves (S1, S2) to adjust the length of the shaft according to the cloud, and the yaw grooves (S1, S2 when the vehicle is turning) ) Constitutes a ball 111 for transmitting torque in the interference with. This will be described in detail below.

The body 100 is produced in a cylindrical shape as shown in Figs. At this time, the thickness is manufactured to a thickness that can be sandwiched between the inner steering shaft (I) and the outer steering shaft (O). In addition, at least two rows of hole rows 110 are formed in the body 100 side by side in the longitudinal direction.

As shown in FIGS. 1 to 4, the hole rows 110 are formed in parallel with the ball support holes 112 for supporting the balls 111 in the longitudinal direction of the body 100.

At this time, the hole row 110 forms at least two rows, preferably at least three rows at equal intervals on the outer surface of the body 100 so that the steering shaft I and the outer steering shaft O are stable. It is desirable to be able to support each other. The figure shows an example in which six rows of holes 110 are formed at equal intervals. The number of the hole rows 110 is preferably determined in consideration of the strength of the torque to be transmitted.

On the other hand, each of the hole rows 110 are formed with a ball support hole 112 at predetermined intervals so as to support the rotation of the plurality of balls, respectively. At this time, the adjacent ball support hole 112 may be formed at different intervals, but is preferably formed at the same interval to be configured to be uniformly transmitted through each ball 111 when the torque occurs.

In a preferred embodiment of the present invention, the ball support hole 112 may be formed on a virtual circumference such as the ball support hole 112 formed in the adjacent hole row 110 as shown in FIG. . In addition, although not shown in the figure, the ball support hole 112 may be formed at a position shifted from the ball support hole 112 formed in the adjacent hole rows 110.

The support protrusion 120 is formed in the outer surface of the body 100, as shown in FIGS. At this time, each support protrusion 120 is formed on each side of the ball support hole 112, one. That is, the ball 111 mounted in the ball support hole 112 receives torque in the circumferential direction of the body 100 as the variable steering shaft is rotated. In this case, the direction of receiving the torque is changed based on the ball 111 of the ball 111 in the direction of rotation of the variable steering shaft, that is, the left and right directions of the vehicle.

Accordingly, in the present invention, the support protrusions 120 are formed on the body 100 on both sides of the ball support hole 112 in the circumferential direction, respectively, and thus the torque applied to the ball 111 according to the rotational direction of the vehicle. Even if the direction of the change is not only able to transfer torque well through the support protrusions 120 formed on both sides, and to withstand strong torque sufficiently.

In particular, the support protrusion 120 according to the present invention is formed so as to connect between the adjacent ball support holes 112 on the circumference, thus generated by frequent rotation of the vehicle with the dispersion effect on the torque applied to the ball 111 It is preferable to configure so that it may endure enough even if the direction of torque to change is changed.

In addition, the support protrusion 120 is formed on the outer surface of the body 100 as described above. At this time, the support protrusion 120 is formed so as not to contact the outer steering shaft O as shown in FIG. 2.

1 to 4, the outer support block 130 is formed in pairs in the longitudinal direction of the body 100 on both sides of the ball support holes 112. That is, the outer support block 130 is formed in a direction preferably perpendicular to the direction intersecting the above-described support protrusion 120. At this time, the two support blocks 130 located between the two adjacent ball support holes 112 is preferably configured not to be connected to each other in the middle of the two adjacent ball support holes 112.

Particularly, the outer support block 130 is formed to be in contact with the ball 111 which is substantially inserted into the ball support hole 112 to receive rotational support so as to support the ball 111 in rotation.

In addition, the outer support block 130 also acts when adjusting the length of the variable steering shaft. That is, as shown in Figure 2, the length adjustment is made in the longitudinal direction (in front and rear direction in Figure 2) of the inner steering shaft (I) and the outer steering shaft (O), the outer support block 130 according to the present invention is this length By forming side by side in the direction and the ball 111 is placed therebetween, even when adjusting the length of the variable steering shaft, the ball 111 can withstand the elastic force generated by the length adjustment by contacting the outer support block 130. In addition, when the ball 111 is rotated to support the rotation.

In a preferred embodiment of the present invention, the outer support block 130 is preferably configured so that the end protruding outward than the ball 111. 2, the ball 111 protruding outward from the outer support block 130 is caught by the grooves S1 and S2 formed in the outer steering shaft O so as to transmit torque. .

In addition, in the preferred embodiment of the present invention, it is preferable that the outer support block 130 is manufactured in the form of a block to sufficiently support the ball 111 as well as to withstand the length adjustment of the variable steering shaft. . In the form of such a block, it is preferable to form in a variety of shapes to form a wide contact area with the ball 111. Accordingly, the outer support block 130 may be manufactured to have a hexagonal shape in which the front shape includes a trapezoidal shape or a square block shape, so that the outer support block 130 can sufficiently endure the elastic force generated when supporting the ball or adjusting the length.

The inner support block 140 is formed on the inner surface of the cylindrical body 100, as shown in Figs. At this time, the inner support block 140 is formed to be in a position corresponding to the above-described outer support block 140. Since the inner support block 140 functions the same as the outer support block 130 described above, a detailed description thereof will be omitted.

In the preferred embodiment of the present invention, the inner support block 140 may be formed to be distinguished from the neighboring inner support block 140, two adjacent inner support block 140 as shown in Figure 3 It can also be formed integrally.

The present invention made as described above is able to stably support the ball subjected to the torque generated by rotating the variable steering shaft for turning the vehicle, it is possible to prevent damage to the ball or body generated by this torque .

Example 2

Torque transmission device of the variable steering shaft for a vehicle according to the second embodiment of the present invention, as shown in Figure 5, compared to the first embodiment, the oil pocket 141 is formed so that the ball 111 can be rolled smoothly . Thus, the same components as in the first embodiment are denoted by the same reference numerals and the detailed description thereof will be omitted, and the description will be made based on the oil pocket 141.

In the torque transmission device according to the second embodiment, as shown in FIG. 5, the oil pocket 141 is formed in a portion in contact with the ball 111, that is, the inner surface of the ball support hole 112. At this time, the oil pocket 141 is formed in a form in which a plurality of grooves of a predetermined size are formed at predetermined intervals, and by adding a configuration that can be lubricated like oil or grease, 111 not only makes it easier to roll, but it also reduces the noise that can occur as these configurations come into contact.

In addition, the oil pocket 141 is further configured in the outer support block 130 in addition to the above-described portion. At this time, the oil pocket 141 is utilized when a lubrication action is required between the outer steering shaft O and the torque transmission device, such as when movement occurs in the longitudinal direction of the body 100 to adjust the length of the variable steering shaft for a vehicle. do.

As described above, the present invention allows oil or grease, etc., to be supplied from the oil pocket so that the ball can operate smoothly when the ball is rolling, such as adjusting the length of the variable steering shaft for the vehicle through the oil pocket. The smooth steering wheel can be operated smoothly and smoothly by eliminating the noise generated from the vehicle.

Example 3

Torque transmission device of the variable steering shaft for a vehicle according to the third embodiment of the present invention, as shown in Figure 6, the same configuration as the first embodiment and the second embodiment or the adjacent outer support block 130 is configured to connect to each other. Accordingly, by rotating the steering shaft to rotate the vehicle, it is possible to accurately transmit the torque generated in the circumferential direction while sufficiently enduring strong torque, and to prevent damage of the ball 111 or the body 100, and also the variable type. Even if the elastic force generated when adjusting the length of the steering shaft is to be able to operate smoothly while preventing the damage of the ball 111 or the body (100).

Here, only the outer support block 130 will be described here, and the same reference numerals are used for the same components as in the other embodiments, and detailed description thereof will be omitted.

As illustrated in FIG. 6, the outer support block 130 is formed in pairs in the longitudinal direction of the body 100 on both sides of the ball support holes 112. That is, the outer support block 130 is preferably formed in a direction perpendicular to the direction intersecting with the aforementioned support protrusion 120.

In the preferred embodiment of the present invention, the outer support block 130, as shown in Figure 6, it is preferable to configure the other outer support block 130 and the connecting portion 131 connected to each other. This is, as shown in Figure 2, when the length adjustment is made in the longitudinal direction (in front and rear direction in Figure 2) of the inner steering shaft (I) and the outer steering shaft (O), the elastic force to stretch the shaft is applied to the ball 111 The elastic force is also transmitted to the outer support block 130 in contact with this. As such, as the outer support block 130 is connected to each other, the outer support block 130 is not damaged by the elastic force, so that the stretching operation can be made smoothly. At this time, the connection portion 131 is formed in a smaller size than the outer support block 130.

In addition, in a preferred embodiment of the present invention, the outer support block 130 is preferably configured so that the end protruding outward than the ball 111. 2, the ball 111 protruding outward from the outer support block 130 is caught by the grooves S1 and S2 formed in the outer steering shaft O so as to transmit torque. .

In addition, in the preferred embodiment of the present invention, the outer support block 130 is preferably manufactured in the form of a block to sufficiently support the ball 111 as well as to withstand when adjusting the length of the variable steering shaft. . In the form of such a block, it is preferable to form in various shapes so that the contact area with the ball 111 can be widened. Accordingly, the outer support block 130 may be manufactured to have a hexagonal shape in which the front shape includes a trapezoidal shape or a square block shape, so that the outer support block 130 can sufficiently endure the elastic force generated when supporting the ball or adjusting the length.

Embodiment 3 of the present invention made as described above can accurately transmit the torque generated by rotating the variable steering shaft for turning of the vehicle through the support protrusion, and in particular with respect to the elastic force generated by adjusting the length of the variable steering shaft Since adjacent outer support blocks are connected to each other, the elastic force can withstand this elastic force sufficiently to prevent breakage of the ball or body caused by such torque or elastic force.

Example 4

Torque transmission device of the variable steering shaft for a vehicle according to the fourth embodiment of the present invention, as shown in Figure 7, as compared with the third embodiment, the oil pocket 141 so that the ball 111 can be rolled smoothly . Thus, the same components as in the third embodiment are denoted by the same reference numerals and the detailed description thereof will be omitted, and the description will be made based on the oil pocket 141.

In the torque transmission device according to the fourth embodiment, as shown in FIG. 7, the oil pocket 141 is formed in a portion in contact with the ball 111, that is, the inner surface of the ball support hole 112. At this time, the oil pocket 141 is formed in a form in which a plurality of grooves of a predetermined size are formed at predetermined intervals, and by adding a configuration that can be lubricated like oil or grease, 111 not only makes it easier to roll, but it also reduces the noise that can occur as these configurations come into contact.

Claims

An inner steering shaft I and an outer steering shaft having at least two yaw grooves S1 and S2 formed side by side in the longitudinal direction so that the balls 111 may be inserted and rolled on the surfaces facing each other in a double tube shape. In the torque transmission device of a variable steering shaft for a vehicle mounted between O),

Including a cylindrical body 100 having a predetermined thickness,

In the body 100,

At least two rows of hole rows 110 are formed on the outer surface at predetermined intervals side by side in the longitudinal direction of the body 100, and each of the hole rows 110 has at least two ball support holes 112 at predetermined intervals. ) And penetrate and support the rotation by inserting the balls 111,

In addition, by connecting between two adjacent ball support holes 112 along the circumference of the outer surface to protrude and form a support protrusion 120 to support each ball 111 when it receives a force in the circumferential direction, each On both sides of the body 100 in the longitudinal direction with respect to the ball support hole 112, the outer end of each ball 111 can be rotated and supported in contact with each ball 111 so as to be exposed to the outside and the length Protruding the outer support block 130 so as not to be connected to each other in the middle of the adjacent ball support hole 112 in the direction,

Torque of the variable steering shaft for a vehicle, characterized in that the inner support block 140 protruding to support the ball 111 in contact with the ball 111 at a position corresponding to the respective outer support block 130 on the inner surface. Delivery device.
An inner steering shaft I and an outer steering shaft having at least two yaw grooves S1 and S2 formed side by side in the longitudinal direction so that the balls 111 may be inserted and rolled on the surfaces facing each other in a double tube shape. In the torque transmission device of a variable steering shaft for a vehicle mounted between O),

In the cylindrical body 100 having a predetermined thickness, at least two rows of holes 110 are formed on the outer surface at predetermined intervals side by side in the longitudinal direction of the body 100, and the respective rows of holes 110. ) And penetrate at least two ball support holes 112 at predetermined intervals, and insert the balls 111 to rotate and support them, respectively;

By connecting between two adjacent ball support holes 112 along the circumference of the outer surface to protrude and form the support projections 120 to support the ball 111 when the force in the circumferential direction, each ball support Outer support block for contact with each ball 111 to rotate and support the outer end of each ball 111 on both sides in the longitudinal direction of the body 100 around the hole 112 ( 130) to protrude;

Protruding inner support block 140 to support the ball 111 in contact with the ball 111 at a position corresponding to each of the outer support block 130 on the inner surface,

Between the two outer support blocks 130 adjacent to each other along the longitudinal direction of the body 100, characterized in that made by connecting to the connecting portion 131 formed in a smaller size than the two outer support blocks 130 Torque transmission device of a variable steering shaft for a vehicle.
The method according to claim 1 or 2,

Each of the ball support holes 112 formed in the two hole rows 110 formed adjacent to each other are formed to face each other on an imaginary circumference formed in the body 100 or are alternately formed. Torque transmission device of the shaft.
The method according to claim 1 or 2,

The outer support block 130 and the inner support block 140 is a torque transmission device for a variable steering shaft for a vehicle, characterized in that each of the front shape is formed of a block of a polygonal shape.
The method according to claim 1 or 2,

Torque transmission device for a variable steering shaft for a vehicle, characterized in that the oil pocket (141) is further formed on the inner surface of the ball support hole (112) and the outer support block (130) in contact with the ball (111).