Clutch device with back input blocking function

Abstract

The present invention is characterized by comprising: a drive shaft that is rotated by power provided from a drive unit; an output shaft that transmits power transmitted from the drive shaft to a driving object; and a variable transmission unit that transmits power provided from the drive shaft to the output shaft and blocks power input in the reverse direction from the output shaft.

Description

Technology Field

[0001] The present invention relates to a clutch device having a reverse input blocking function that blocks power input in the reverse direction by an external force generated in a driven object depending on the operating environment from being transmitted to a driving unit. Background Technology

[0002] Recently, vehicle steering systems are equipped with hydraulic devices, motors, and reduction gears to steer the vehicle's drive wheels according to driving conditions.

[0003] As mentioned above, steering systems that control the steering of a vehicle with a motor without mechanical connection are applied to 4-wheel independent steering systems, SBW (Steer by wire), etc.

[0004] This motor-controlled steering system can also be applied to a vehicle's rear-wheel steering (RWS).

[0005] Rear-wheel steering systems generally operate to reduce the turning radius when the vehicle is at low speeds and to improve driving stability when the vehicle is at high speeds.

[0006] A typical example of a conventional rear-wheel steering system using a motor is the use of a lead screw directly connected to a hollow motor as a reduction gear, considering vehicle mounting compatibility.

[0007] This reduction gear structure consists of a nut directly connected to the rotor shaft of a hollow motor and a lead screw bar that converts the rotation of the nut into linear motion.

[0008] Basically, since lead screw bars that use surface contact have low efficiency, the output of hollow motors applied to conventional structures increases, leading to an increase in motor size and cost.

[0009] In addition, the reverse input transmitted through the lead screw bar is directly transferred to the motor through the nut, which degrades motor performance and presents disadvantages regarding noise and vibration.

[0010] The background technology of the present invention is disclosed in Korean Published Patent Application No. 10-2018-0130240 (published on December 7, 2018, title of invention: rear wheel steering device). The problem to be solved

[0011] The purpose of the present invention is to provide a clutch device equipped with a reverse input blocking function that can prevent malfunction and damage to the drive unit caused by reverse power being transmitted to the drive unit by blocking the power transmission function when power is input in the reverse direction due to an external force generated on a driven object. means of solving the problem

[0012] The present invention is characterized by comprising: a drive shaft that is rotated by power provided from a drive unit; an output shaft that transmits power transmitted from the drive shaft to a driving object; and a variable transmission unit that transmits power provided from the drive shaft to the output shaft and blocks power input in the reverse direction from the output shaft.

[0013] The above drive shaft may include a shaft body connected to the drive unit; and a drive connection unit connecting the shaft body to the rotation center of the variable transmission unit having a diameter different from that of the shaft body.

[0014] The above drive connection part may include: a drive panel installed on the shaft body; a plurality of connecting protrusions installed on the drive panel so as to be spaced apart from the shaft body and arranged at the same distance from the shaft body to be coupled to the variable transmission part; and a connecting hole part provided on the variable transmission part so as to be inserted and connected to the connecting protrusions.

[0015] The output shaft may include a first shaft member connected to the variable transmission unit; a second shaft member connected to the driving object; and a transmission block provided between the first shaft member and the second shaft member and coupled with the variable transmission unit.

[0016] The variable transmission unit may include: a housing connected to the driving unit and providing an installation space; a plurality of shoe members rotatably installed in the housing and installed with a variable spacing between them; and a braking unit that cuts off power while widening the spacing between the plurality of shoe members and causing the shoe members to frictionally rub against the housing.

[0017] The above shoe member may include: a first shoe provided on one side of the housing, having one end rotatably connected to the drive shaft and the other end movably connected to the drive shaft; a second shoe provided on the other side of the housing, having one end rotatably connected to the drive shaft and the other end movably connected to the drive shaft, and installed symmetrically with the first shoe; and a variable connecting member that movably connects the first shoe and the second shoe and maintains a constant gap between the first shoe and the second shoe.

[0018] The variable connection part may include: an elongated portion provided in the first shoe and the second shoe so as to allow the drive shaft to be movably connected; and a first elastic member installed between the first shoe and the second shoe to provide tension that pulls the first shoe and the second shoe together.

[0019] The braking unit may include: a braking groove provided in the transmission block; a braking projection installed to be movable along the gap between the first shoe and the second shoe, inserted into the braking groove, and protruding outward from the braking groove by being pressed by the inclined surface of the braking groove when the transmission block is rotated; and a conversion transmission unit that converts and transmits the linear motion of the braking projection into a motion that widens the gap between the first shoe and the second shoe.

[0020] The above conversion transmission unit may include: a pressure projection that is pressed by the braking projection and moves outwardly toward the first shoe and the second shoe; a first inclined surface formed on the first shoe to be pressed by the inclined surface of the pressure projection and push the first shoe outwardly; and a second inclined surface formed on the second shoe symmetrically with respect to the first inclined surface, which is pressed by the inclined surface of the pressure projection and pushes the second shoe outwardly.

[0021] The above variable transmission unit may further include a restoration unit that restores the operation of the braking unit to its original state when the reverse power transmitted through the output shaft is released.

[0022] The above restoration member may include a restoration projection installed between the first shoe and the second shoe such that a connecting shaft connecting the pressure projection and the braking projection passes through it; and a second elastic member interposed between the restoration projection and the braking projection to provide an elastic force that separates the pressure projection and the braking projection from the first inclined surface and the second inclined surface.

[0023] The present invention includes a drive shaft that is rotated by power provided from a drive unit; an output shaft that transmits power from the drive shaft to a driving object; and a variable transmission unit that transmits power provided from the drive shaft to the output shaft and blocks power input in the reverse direction from the output shaft, and can be installed in any one of a four-wheel independent steering system, an SBW (Steer by wire) system, or a rear-wheel steering system. Effects of the invention

[0024] The clutch device having a reverse input blocking function according to the present invention is equipped with a variable transmission unit that transmits forward power and blocks reverse power between a drive shaft connected to a drive unit and an output shaft connected to a drive object. Therefore, if reverse power is input through the output shaft due to an external force generated on the drive object depending on the driving environment in which the drive object is operating, the reverse power can be blocked by the operation of the variable transmission unit, thereby having the advantage of preventing reverse power from being transmitted to the drive unit.

[0025] In addition, the clutch device having a reverse input blocking function according to the present invention is equipped with a variable connecting part that variably connects the gap between a pair of shoe members, and since the output shaft is installed to be linked with the variable connecting part, when reverse power is input along the output shaft, the variable connecting part operates by the reverse power of the output shaft, thereby widening the gap between the pair of shoe members and blocking the reverse power.

[0026] In addition, the clutch device having a reverse input blocking function according to the present invention can block reverse input by means of a mechanical connection structure consisting of a shoe member and a variable connection part without a separate electronic device, thereby having the advantage of reducing the time and cost required to manufacture the clutch device having a reverse input blocking function.

[0027] In addition, the clutch device having a reverse input blocking function according to the present invention is equipped with a braking unit that blocks the reverse input by widening the gap between a pair of shoe members when the reverse input is transmitted along the output shaft, and a restoring unit that restores the operation of the braking unit to its original state when the reverse input is released, thereby having the advantage of preventing malfunction in which forward power is not transmitted even after the reverse input is released.

[0028] In addition, the clutch device having a reverse input blocking function according to the present invention has the advantage of being able to provide the steering device with a function to block reverse input by applying it to a lead screw type rear wheel steering device that overcomes a steering limit of ±5 to 10 degrees by applying a ball screw.

[0029] In addition, the clutch device having a reverse input blocking function according to the present invention has the advantage of being applicable to all steering devices in which steering is achieved by motor driving, such as four-wheel independent steering devices, SBW (Steer by wire), and rear-wheel steering devices. Brief explanation of the drawing

[0030] FIG. 1 is a drawing showing a rear wheel steering device equipped with a clutch device having a reverse input blocking function according to one embodiment of the present invention. FIG. 2 is a perspective view showing a clutch device having a reverse input blocking function according to one embodiment of the present invention. FIG. 3 is an exploded perspective view showing the housing and variable transmission part of a clutch device having a reverse input blocking function according to one embodiment of the present invention. FIG. 4 is an exploded perspective view showing the drive shaft, output shaft, and variable transmission part of a clutch device having a reverse input blocking function according to one embodiment of the present invention. FIG. 5 is a cross-sectional view showing a clutch device having a reverse input blocking function according to one embodiment of the present invention. FIG. 6 is an operating state diagram showing a clutch device having a reverse input blocking function according to one embodiment of the present invention. FIG. 7 is a cross-sectional view showing the braking part and the restoring part of a clutch device having a reverse input blocking function according to one embodiment of the present invention. Specific details for implementing the invention

[0031] Hereinafter, an embodiment of a clutch device having a reverse input blocking function according to the present invention will be described with reference to the attached drawings.

[0032] In this process, the thickness of the lines or the size of the components shown in the drawings may be exaggerated for the sake of clarity and convenience of explanation.

[0033] In addition, the terms described below are defined considering their functions in the present invention, and these may vary depending on the intention or practice of the user or operator.

[0034] Therefore, the definitions of these terms should be based on the content throughout this specification.

[0035] FIG. 1 is a drawing showing a rear wheel steering device equipped with a clutch device having a reverse input blocking function according to an embodiment of the present invention, FIG. 2 is a perspective view showing a clutch device having a reverse input blocking function according to an embodiment of the present invention, and FIG. 3 is an exploded perspective view showing a housing and a variable transmission part of a clutch device having a reverse input blocking function according to an embodiment of the present invention.

[0036] In addition, FIG. 4 is an exploded perspective view showing the drive shaft, output shaft, and variable transmission part of a clutch device having a reverse input blocking function according to an embodiment of the present invention, FIG. 5 is a cross-sectional view showing a clutch device having a reverse input blocking function according to an embodiment of the present invention, FIG. 6 is an operating state diagram showing a clutch device having a reverse input blocking function according to an embodiment of the present invention, and FIG. 7 is a cross-sectional view showing the braking part and the restoration part of a clutch device having a reverse input blocking function according to an embodiment of the present invention.

[0037] Referring to FIGS. 1 to 7, a clutch device having a reverse input blocking function according to one embodiment of the present invention includes a drive shaft (10) that is rotated by power provided from a drive unit (102), an output shaft (30) that transmits power from the drive shaft (10) to a driving object, and a variable transmission unit (50) that transmits power provided from the drive shaft (10) to the output shaft (30) and blocks power input in the reverse direction from the output shaft (30).

[0038] Accordingly, when the clutch device (100) according to the present embodiment is installed in the rear wheel steering device, the power generated by the operation of the steering wheel is transmitted from the drive unit (102) through the clutch device (100) to the screw (104) to enable steering of the rear wheel, and when reverse power is generated to steer the rear wheel due to an external force generated on the rear wheel during driving, the reverse power is blocked by the operation of the variable transmission unit (50), thereby preventing malfunction and damage to the drive unit (102) caused by the reverse power transmitted to the drive unit (102).

[0039] The drive shaft (10) of the present invention includes a shaft body (12) connected to a drive unit (102) and a drive connection part (14) that connects the shaft body (12) to the rotation center of a variable transmission unit (50) having a different diameter from the shaft body (12). Therefore, when the power of the drive shaft (10) is transmitted to the variable transmission unit (50), the rotation center of the output shaft (30) and the rotation center of the variable transmission unit (50) are connected so that they are positioned on the same straight line, thereby enabling the power of the drive unit (102) to be transmitted without eccentricity.

[0040] The drive connection part (14) includes a drive panel (16) installed on the shaft body (12), a plurality of connecting protrusions (17) installed on the drive panel (16) so as to be spaced apart from the shaft body (12) and arranged at the same distance from the shaft body (12) and coupled to the variable transmission part (50), and a connecting hole part (18) provided on the variable transmission part (50) so as to be inserted and connected to the connecting protrusions (17).

[0041] A drive panel (16) that is widely formed in the lateral direction is integrally connected to the end of the shaft body (12), and a plurality of connecting protrusions (17) are formed on the edge of the drive panel (16). Since the plurality of connecting protrusions (17) are arranged at the same distance from the rotation center of the shaft body (12), even if the rotation center of the variable transmission unit (50) connected to the shaft body (12) is spaced apart from the connecting protrusions (17), the rotation center of the shaft body (12) and the rotation center of the variable transmission unit (50) can be arranged on the same straight line.

[0042] The output shaft (30) of the present embodiment includes a first shaft member (32) connected to a variable transmission unit (50), a second shaft member (34) connected to a driving object, and a transmission block (36) provided between the first shaft member (32) and the second shaft member (34) and linked with the variable transmission unit (50).

[0043] Here, the transmission block (36) is made of a polyhedral block inserted into the variable transmission unit (50), so the transmission block (36) having multiple edges is inserted into the gap between the shoe members (56) provided in the variable transmission unit (50). When the power of the drive shaft (10) rotates the entire variable transmission unit (50), the transmission block (36) interposed between the shoe members (56) provided in the variable transmission unit (50) rotates in conjunction with the shoe members (56) and transmits power to the output shaft (30).

[0044] The variable transmission unit (50) of the present embodiment includes a housing (52) connected to a driving unit (102) and providing an installation space, a plurality of shoe members (56) rotatably installed in the housing (52) and installed such that the spacing between them can be varied, and a braking unit (75) that cuts off power by widening the spacing between the plurality of shoe members (56) and causing the shoe members (56) to frictionally rub against the housing (52).

[0045] The shoe member (56) includes a first shoe (57) which is provided on one side of the housing (52), has one end rotatably connected to the drive shaft (10), and the other end movably connected to the drive shaft (10); a second shoe (58) which is provided on the other side of the housing (52), has one end rotatably connected to the drive shaft (10), and the other end movably connected to the drive shaft (10), and is installed symmetrically with the first shoe (57); and a variable connection part (70) which movably connects the first shoe (57) and the second shoe (58) and maintains a constant distance between the first shoe (57) and the second shoe (58).

[0046] The first shoe (57) and the second shoe (58) have a front shape that is semicircular and, when placed adjacent to each other, form a shape similar to a disc, so they can be stored inside a housing (52) that is shaped like a disc. A connecting hole (18) is formed at one end of the first shoe (57) and the second shoe (58) so that a connecting projection (17) is inserted, and thus the first shoe (57) and the second shoe (58) are installed to be rotatable by a predetermined amount around the connecting projection (17) inside the housing (52).

[0047] The other end portions of the first shoe (57) and the second shoe (58) have an elongated portion (72) formed therein, so that even if the connecting projection (17) is inserted, the other end portions of the first shoe (57) and the second shoe (58) can move outward by the length of the elongated portion (72).

[0048] The variable connection part (70) of the present embodiment includes an elongated portion (72) provided in the first shoe (57) and the second shoe (58) so that the drive shaft (10) can be movably connected, and a first elastic member (74) installed between the first shoe (57) and the second shoe (58) to provide tension that pulls the first shoe (57) and the second shoe (58) against each other.

[0049] Accordingly, the first shoe (57) and the second shoe (58) are positioned at a constant distance from each other by the elastic force provided by the first elastic member (74), so that the outer walls of the first shoe (57) and the second shoe (58) and the inner wall of the housing (52) remain separated from each other.

[0050] As described above, when power is transmitted to the first shoe (57) and the second shoe (58) while the first shoe (57) and the second shoe (58) are separated from the housing (52), the drive shaft (10), the first shoe (57), the second shoe (58), and the output shaft (30) rotate simultaneously, thereby transmitting power. When reverse power is input along the output shaft (30), the gap between the first shoe (57) and the second shoe (58) widens due to the operation of the braking unit (75), and the outer walls of the first shoe (57) and the second shoe (58) and the inner wall of the housing (52) rub against each other, thereby blocking the power input through the output shaft (30).

[0051] The braking unit (75) of the present embodiment includes a braking groove (78) provided in the transmission block (36), a braking projection (79) that is installed to be movable along the gap between the first shoe (57) and the second shoe (58), is inserted into the braking groove (78), and protrudes outward from the braking groove (78) by being pressed by the inclined surface of the braking groove (78) when the transmission block (36) is rotated, and a conversion transmission unit (80) that converts and transmits the linear motion of the braking projection (79) into a motion that widens the gap between the first shoe (57) and the second shoe (58).

[0052] A first operating groove (76) is formed in a concave outward direction in the central part of the first shoe (57), and a second operating groove (77) is formed in a concave outward direction in the central part of the second shoe (58). Thus, the space in which the first operating groove (76) and the second operating groove (77) are arranged facing each other forms a space into which a transmission block (36) is inserted. Since the first operating groove (76) and the second operating groove (77) are arranged in close contact with the outer wall of the transmission block (36) having multiple corners, the transmission block (36) is pressed by the first operating groove (76) and the second operating groove (77) when the shoe member (56) rotates, thereby transmitting power to the output shaft (30).

[0053] When forward power is transmitted as described above, or when power transmission is not taking place, an external force is transmitted to the drive wheel of the vehicle and the drive wheel is steered, and reverse power can be input along the output shaft (30). At this time, when the output shaft (30) of the present embodiment rotates, the transmission block (36) rotates, thereby widening the gap between the first shoe (57) and the second shoe (58).

[0054] When the gap between the first shoe (57) and the second shoe (58) widens, the outer walls of the first shoe (57) and the second shoe (58) rub against the inner wall of the housing (52), thereby blocking the power input along the output shaft (30) and preventing reverse power from being transmitted to the drive unit (102).

[0055] Additionally, the conversion transmission unit (80) of the present embodiment includes a pressure projection (82) that is pressed by a braking projection (79) and moves outwardly toward the first shoe (57) and the second shoe (58), a first inclined surface (84) formed on the first shoe (57) to be pressed by the inclined surface of the pressure projection (82) and push the first shoe (57) outwardly, and a second inclined surface (86) formed on the second shoe (58) symmetrically with respect to the first inclined surface (84) and to be pressed by the inclined surface of the pressure projection (82) and push the second shoe (58) outwardly.

[0056] Accordingly, when the transmission block (36) is rotated by power input in the reverse direction along the output shaft (30), the transmission block (36) rotates and the braking projection (79) stored in the braking groove (78) is pressed by the inclined surface and discharged to the outside of the braking groove (78), and the braking projection (79) presses the pressing projection (82) to the first inclined surface (84) and the second inclined surface (86), so the first inclined surface (84) and the second inclined surface (86) are pushed outward, and the gap between the first shoe (57) and the second shoe (58) widens.

[0057] Additionally, the variable transmission unit (50) of the present invention further includes a restoration unit (90) that restores the operation of the braking unit (75) to its original state when reverse power transmitted through the output shaft (30) is released. The restoration unit (90) includes a restoration projection (92) installed between the first shoe (57) and the second shoe (58) such that a connecting shaft connecting the pressure projection (82) and the braking projection (79) passes through it, and a second elastic member (94) interposed between the restoration projection (92) and the braking projection (79) to provide an elastic force that separates the pressure projection (82) and the braking projection (79) from the first inclined surface (84) and the second inclined surface (86).

[0058] As the pressure projection (82), which is pressed by the braking projection (79), presses the first inclined surface (84) and the second inclined surface (86) outwardly, the gap between the first shoe (57) and the second shoe (58) widens, and the friction sheet (59) installed on the outer wall of the first shoe (57) and the second shoe (58) and the inner wall of the housing (52) are frictionally connected, thereby restricting the reverse rotational movement of the drive shaft (10).

[0059] When the reverse power as described above is released, the second elastic member (94), which was compressed by the braking projection (79), is restored to its original state, and the gap between the braking projection (79) and the restoration projection (92) is widened, so that the braking projection (79) and the pressure projection (82) retract to their original positions, and the gap between the first shoe (57) and the second shoe (58) is restored to its original state.

[0060] Thus, it is possible to provide a clutch device equipped with a reverse input blocking function that blocks the power transmission function when power is input in the reverse direction due to an external force generated on the driven object, thereby preventing malfunction and damage to the drive unit caused by the transmission of reverse power due to the external force to the drive unit.

[0061] Although the present invention has been described with reference to an embodiment illustrated in the drawings, this is merely illustrative, and those skilled in the art will understand that various modifications and equivalent alternative embodiments are possible therefrom.

[0062] In addition, although a clutch device equipped with a reverse input blocking function has been described as an example, this is merely illustrative, and the clutch device of the present invention may be used in other products that are not equipped with a reverse input blocking function.

[0063] Therefore, the true technical scope of protection of the present invention should be determined by the following patent claims. Explanation of the symbols

[0064] 10: Drive shaft 12 : Source 14 : Drive connection part 16 : Drive panel 17 : Connecting protrusion 18: Connection hole part 30 : Output axis 32 : First axis member 34 : Second axis member 36 : Transfer block 50 : Variable transmission unit 52 : Housing 54 : Finishing frame 56 : Shubujae 57 : 1st Shu 58 : 2nd Shu 59 : Friction sheet 70 : Variable connection part 72 : Jang Gong Bu 74 : First elastic member 75 : Braking unit 76 : First operating groove 77 : Second operating groove 78 : Braking groove 79 : Braking protrusion 80 : Transformation / Transfer Section 82 : Pressure projection 84 : First slope 86 : Second slope 90 : Restoration part 92 : Restoration projection 94 : Second elastic member 100 : Drive unit 102 : Screw 104 : Clutch

Claims

Claim 1 A clutch device having a reverse input blocking function, characterized by comprising: a drive shaft that is rotated by power provided from a drive unit; an output shaft that transmits power transmitted from the drive shaft to a driving object; and a variable transmission unit that transmits power provided from the drive shaft to the output shaft and blocks power input in the reverse direction from the output shaft. Claim 2 A clutch device having a reverse input blocking function, characterized in that, in claim 1, the drive shaft comprises: a shaft body connected to the drive unit; and a drive connection unit connecting the shaft body to the rotational center of the variable transmission unit having a diameter different from that of the shaft body. Claim 3 A clutch device having a reverse input blocking function, characterized in that, in paragraph 2, the drive connection part comprises: a drive panel installed on the shaft body; a plurality of connecting protrusions installed on the drive panel so as to be spaced apart from the shaft body and arranged at the same distance from the shaft body to be coupled to the variable transmission part; and a connecting hole part provided in the variable transmission part so as to be inserted and connected to the connecting protrusions. Claim 4 A clutch device having a reverse input blocking function, characterized in that, in claim 1, the output shaft comprises: a first shaft member connected to the variable transmission unit; a second shaft member connected to the driving object; and a transmission block provided between the first shaft member and the second shaft member and linked with the variable transmission unit. Claim 5 A clutch device having a reverse input blocking function, characterized in that, in paragraph 4, the variable transmission unit comprises: a housing connected to the driving unit and providing an installation space; a plurality of shoe members rotatably installed in the housing and installed with a spacing between them variablely; and a braking unit that blocks power by rubbing the shoe members against the housing while widening the spacing between the plurality of shoe members. Claim 6 A clutch device having a reverse input blocking function, characterized in that, in claim 5, the shoe member comprises: a first shoe provided on one side of the housing, having one end rotatably connected to the drive shaft and the other end movably connected to the drive shaft; a second shoe provided on the other side of the housing, having one end rotatably connected to the drive shaft and the other end movably connected to the drive shaft, and installed symmetrically with the first shoe; and a variable connecting part that movably connects the first shoe and the second shoe and maintains a constant gap between the first shoe and the second shoe. Claim 7 A clutch device having a reverse input blocking function, characterized in that, in claim 6, the variable connecting part comprises: an elongated portion provided in the first shoe and the second shoe so as to allow the drive shaft to be movably connected; and a first elastic member installed between the first shoe and the second shoe to provide tension that pulls the first shoe and the second shoe together. Claim 8 A clutch device having a reverse input blocking function, characterized in that, in claim 6, the braking unit comprises: a braking groove portion provided in the transmission block; a braking projection installed to be movable along the gap between the first shoe and the second shoe, inserted into the braking groove portion, and protruding outward from the braking groove portion by being pressed by the inclined surface of the braking groove portion when the transmission block is rotated; and a conversion transmission unit that converts and transmits the linear motion of the braking projection into a motion that widens the gap between the first shoe and the second shoe. Claim 9 A clutch device having a reverse input blocking function, wherein the conversion transmission unit comprises: a pressure projection that is pressed by the braking projection and moves outwardly to the first shoe and the second shoe; a first inclined surface formed on the first shoe to be pressed by the inclined surface of the pressure projection and push the first shoe outwardly; and a second inclined surface formed on the second shoe symmetrically with respect to the first inclined surface and pressed by the inclined surface of the pressure projection to push the second shoe outwardly. Claim 10 A clutch device having a reverse input blocking function, wherein, in claim 9, the variable transmission unit further includes a restoration unit that restores the operation of the braking unit to its original state when reverse power transmitted through the output shaft is released, and the restoration unit includes: a restoration projection installed between the first shoe and the second shoe such that a connecting shaft connecting the pressure projection and the braking projection passes through it; and a second elastic member interposed between the restoration projection and the braking projection to provide an elastic force that separates the pressure projection and the braking projection from the first inclined surface and the second inclined surface. Claim 11 A clutch device having a reverse input blocking function, characterized by comprising: a drive shaft that is rotated by power provided from a drive unit; an output shaft that transmits power from the drive shaft to a driving object; and a variable transmission unit that transmits power provided from the drive shaft to the output shaft and blocks power input in the reverse direction from the output shaft, and is installed in any one of a four-wheel independent steering system, an SBW (Steer by Wire) system, or a rear-wheel steering system.

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