WO2021060863A1 - Intermediate shaft of vehicle steering system - Google Patents

Intermediate shaft of vehicle steering system Download PDF

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Publication number
WO2021060863A1
WO2021060863A1 PCT/KR2020/012941 KR2020012941W WO2021060863A1 WO 2021060863 A1 WO2021060863 A1 WO 2021060863A1 KR 2020012941 W KR2020012941 W KR 2020012941W WO 2021060863 A1 WO2021060863 A1 WO 2021060863A1
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WO
WIPO (PCT)
Prior art keywords
grooves
yoke
steering system
intermediate shaft
vehicle steering
Prior art date
Application number
PCT/KR2020/012941
Other languages
French (fr)
Korean (ko)
Inventor
홍성종
우종학
홍진용
구광모
Original Assignee
남양넥스모 주식회사
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Application filed by 남양넥스모 주식회사 filed Critical 남양넥스모 주식회사
Publication of WO2021060863A1 publication Critical patent/WO2021060863A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D1/00—Steering controls, i.e. means for initiating a change of direction of the vehicle
    • B62D1/02—Steering controls, i.e. means for initiating a change of direction of the vehicle vehicle-mounted
    • B62D1/16—Steering columns
    • B62D1/18—Steering columns yieldable or adjustable, e.g. tiltable
    • B62D1/185—Steering columns yieldable or adjustable, e.g. tiltable adjustable by axial displacement, e.g. telescopically
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D5/00—Power-assisted or power-driven steering
    • B62D5/02—Power-assisted or power-driven steering mechanical, e.g. using a power-take-off mechanism for taking power from a rotating shaft of the vehicle and applying it to the steering gear
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C3/00—Shafts; Axles; Cranks; Eccentrics
    • F16C3/02—Shafts; Axles
    • F16C3/03—Shafts; Axles telescopic
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
    • B60Y2306/00—Other features of vehicle sub-units
    • B60Y2306/09—Reducing noise

Definitions

  • the present invention relates to an INTERMEDIATE SHAFT OF VEHICLE STEERING SYSTEM of a vehicle steering system, and in more detail, it is configured to change the length in the axial direction, and in the axial direction by a plurality of balls provided therein. It relates to an intermediate shaft of a vehicle steering system whose length is smoothly changed.
  • a general vehicle steering system is a system that steers a wheel in a direction in which the driver rotates the steering wheel left and right, and the steering shaft on which the steering wheel is installed at the top, and an intermediate shaft coupled to the bottom of the steering shaft through a universal joint. And a steering gear having a pinion shaft coupled to a lower end of the intermediate shaft through a universal joint, and a rack engaging a pinion formed on the pinion shaft.
  • the steering shaft, the intermediate shaft, and the pinion shaft are rotated together in the same direction as the steering wheel, and accordingly, the rack bar included in the steering gear is moved horizontally and linearly, so that the The wheel is steered in the rotation direction of the steering wheel by rotating the knuckle connected to the wheel of the wheel by tie rods respectively coupled to both ends of the rack bar.
  • a power steering device is installed in the steering system so that the steering wheel can be rotated with a small force.
  • an electric motor installed on the pinion shaft is controlled according to a detection value of a sensor that detects the driver's steering intention, size, and direction when the driver rotates the steering wheel, so that the electric motor is the pinion shaft. By rotating, the driver can rotate the steering wheel with little force.
  • FIG. 1 is a diagram showing a vehicle steering system in which a power steering device is installed.
  • a vehicle steering system in which a power steering device 40 is installed is a system in which a power steering device 40 is additionally mounted on the general vehicle steering system, and includes a steering column 10 and a steering shaft 20. ), an intermediate shaft 30, a power steering device 40, and a steering gear 50.
  • a bracket may be installed on the outer periphery of the steering column 10, and the bracket may be coupled to a vehicle body to support the steering column 10.
  • the steering column 10 may rotatably support the steering shaft 20.
  • the steering shaft 20 may vertically penetrate the steering column 10.
  • the upper end of the steering shaft 20 may protrude to the upper end of the steering column 10, and the lower end of the steering shaft 20 may protrude toward the lower end of the steering column 10.
  • the steering wheel (not shown) may be coupled to an upper end of the steering shaft 20, which is a configuration that the driver holds by hand and rotates to the left or right to steer the wheel of the vehicle.
  • the lower end of the steering shaft 20 may be coupled to the intermediate shaft 30 through the upper universal joint 31. That is, the upper end of the intermediate shaft 30 may be coupled to the lower end of the steering shaft 20 through the upper universal joint 31.
  • the lower end of the intermediate shaft 30 may be coupled to the input shaft 42 of the power steering device 40 through the lower universal joint 32. That is, the input shaft 42 of the power steering device 40 is disposed to protrude from the upper end of the power steering device 40 and may be coupled to the lower end of the intermediate shaft 30 through the lower universal joint 32.
  • the intermediate shaft 30 may transmit the rotational force transmitted from the steering shaft 20 to the input shaft 42 of the power steering device 40.
  • the pinion shaft (not shown) may be protruded at the lower end of the power steering device 40.
  • the pinion gear may be formed on the outer periphery of the pinion shaft.
  • the pinion shaft may be inserted into the hollow power steering device mounting portion 55 protruding from the housing 51 of the steering gear 50, and in this state, the pinion gear is the housing 51 of the steering gear 50 It may engage with a rack (not shown) formed on the rack bar 52 disposed to be movable left and right inside.
  • Tie rods 53 and 54 may be coupled to the left and right ends of the rack bar 52, respectively.
  • the tie rods 53 and 54 may include a left tie rod 53 connected to a knuckle of a left wheel, and a right tie rod 54 connected to a knuckle of a right wheel.
  • the rack bar 52 When the pinion shaft is rotated in one direction, the rack bar 52 may be linearly moved to the left, and accordingly, the left tie rod 53 and the right tie rod 54 are linearly moved to the left, and the knuckle coupled to the left and right wheels, respectively. By rotating to the left, the left and right wheels can be steered to the left.
  • the rack bar 52 may be linearly moved to the right, and accordingly, the left tie rod 53 and the right tie rod 54 are linearly moved to the right to each of the left and right wheels.
  • the left and right wheels can be steered to the right.
  • the intermediate shaft 30 is composed of a yoke tube having one end hollow and a yoke shaft having one end inserted into the hollow, so that the yoke tube or the yoke shaft is axially driven by a load acting in the axial direction. It is also configured so that the length is variable while slipping in the direction.
  • the intermediate shaft 30 is composed of the yoke tube and the yoke shaft
  • a plurality of balls are installed between the yoke tube and the yoke shaft, so that the yoke tube or the yoke shaft is formed by the plurality of balls. It can be easily slipped in the axial direction.
  • Another technical problem of the present invention is to provide an intermediate shaft of a vehicle steering system capable of maintaining rigidity while being light.
  • Another technical problem of the present invention is to provide an intermediate shaft of a vehicle steering system in which an applied load can be easily distributed.
  • the intermediate shaft of the vehicle steering system is composed of a yoke tube, a yoke shaft, a plurality of balls and a sleeve member.
  • a plurality of first grooves extending in the axial direction are formed on an inner circumferential surface of one end of the yoke tube.
  • the plurality of first grooves are disposed to be spaced apart from each other along the circumferential direction.
  • One end of the yoke shaft is inserted into one end of the yoke tube.
  • a plurality of second grooves facing each of the plurality of first grooves are formed to extend in an axial direction on an outer peripheral surface of one end of the yoke shaft.
  • the plurality of second grooves are disposed to be spaced apart from each other along the circumferential direction.
  • the plurality of balls are inserted into the plurality of first grooves and the plurality of second grooves.
  • the sleeve member is disposed between the yoke tube and the yoke shaft to rotatably support the plurality of balls.
  • the sleeve member is provided with a plurality of ball support portions inserted into the plurality of first grooves and the plurality of second grooves to rotatably support the plurality of balls.
  • the plurality of ball support portions are disposed to be spaced apart from each other in the circumferential direction.
  • Each of the plurality of ball support portions is formed with a plurality of ball mounting holes through which the plurality of balls are rotatably mounted.
  • the plurality of ball mounting holes are disposed to be spaced apart from each other in the axial direction.
  • the plurality of ball support portions are formed in a columnar shape having a circular longitudinal section.
  • the plurality of ball support portions may have an elliptical longitudinal cross section.
  • the plurality of first grooves and the plurality of second grooves may be formed in an arc shape.
  • One end of the yoke tube may have an outer diameter smaller than that of the other end of the yoke tube.
  • a plurality of reinforcing ribs extending in the axial direction may protrude from portions corresponding to each of the plurality of first grooves on an outer circumferential surface of one end of the yoke tube.
  • the plurality of reinforcing ribs may be disposed to be spaced apart from each other along the circumferential direction.
  • a spacing of the plurality of ball mounting holes formed in one of the plurality of ball support portions and a spacing of the plurality of ball mounting holes formed in the other may be formed differently from each other.
  • Each of the plurality of ball support parts may have an elastic pressing part formed between the plurality of ball mounting holes.
  • the elastic pressing part may have a cutout groove.
  • the plurality of balls may be elastically inserted into the plurality of ball mounting holes by the elastic force of the elastic pressing unit.
  • Both sides of the inlet of the plurality of first grooves in the radial direction and both sides of the inlet of the plurality of second grooves in the radial direction may be spaced apart from the plurality of balls.
  • Both sides of the inlet of the plurality of first grooves in the radial direction and both sides of the inlet of the plurality of second grooves in the radial direction may have a convex curved surface.
  • Both sides of the inlet in the radial direction of the plurality of first grooves and both sides of the inlet in the radial direction of the plurality of second grooves may be formed as inclined surfaces that expand toward the inlet in the radial direction.
  • the axial width of the elastic pressing unit may be formed to be narrower toward the outer side in the radial direction.
  • a dust cap may be covered on the outer periphery of one end of the yoke tube.
  • the yoke shaft may pass through the dust cap.
  • An air flow hole communicating with the inner space of the yoke tube may be formed in the dust cap.
  • the air flow hole may be formed in a plurality of arc shapes on one surface of the dust cap in the axial direction.
  • the ball support portion of the sleeve member provided between the yoke tube and the yoke shaft is formed in a column shape having a circular longitudinal section, a plurality of balls are mounted on the ball support portion. Since the plurality of ball mounting holes strongly grip the plurality of balls each mounted in the hole, there is an effect of maintaining a state in which the plurality of balls are stably mounted in the plurality of ball mounting holes.
  • an outer diameter of one end of the yoke tube is formed smaller than an outer diameter of the other end of the yoke tube, and one end of the yoke tube is formed on an outer circumferential surface of one end of the yoke tube. Since a plurality of reinforcing ribs corresponding to the first groove formed extending in the axial direction are formed on the inner peripheral surface of the unit, there is also an effect of maintaining rigidity while being light.
  • the spacing of the ball mounting hole formed in one of the plurality of ball support portions formed in the sleeve member is different from the spacing of the ball mounting hole formed in the other.
  • FIG. 1 is a view showing a vehicle steering system in which a power steering device is installed
  • FIG. 2 is a perspective view showing an intermediate shaft of a vehicle steering system according to an embodiment of the present invention
  • FIG. 3 is a perspective view showing a part of a yoke tube in an intermediate shaft of a vehicle steering system according to an embodiment of the present invention
  • Figure 4 is a partially enlarged view of Figure 3
  • FIG. 5 is an enlarged view of a cross section taken along line A-A of FIG. 2;
  • FIG. 6 is a further enlarged view of the enlarged view of FIG. 5;
  • FIG. 7 is a partial perspective view of FIG. 3 viewed from a different angle.
  • FIG. 2 is a perspective view showing an intermediate shaft of a vehicle steering system according to an embodiment of the present invention
  • FIG. 3 is a perspective view showing a part of a yoke tube in the intermediate shaft of a vehicle steering system according to an embodiment of the present invention
  • FIG. 4 is a partially enlarged view of FIG. 3
  • FIG. 5 is an enlarged view of a cross section taken along line AA of FIG. 2
  • FIG. 6 is a further enlarged view of FIG. 5
  • FIG. 7 is a view of FIG. 3 from a different angle. It is a partial perspective view.
  • the intermediate shaft 100 may include a yoke tube 110 and a yoke shaft 120.
  • One end of the yoke shaft 120 may be inserted into one end of the yoke tube 110.
  • One end of the yoke tube 110 may be formed as a hollow, and one end of the yoke shaft 120 may be inserted into the hollow of the yoke tube 110 and may be provided to be reciprocated in the axial direction.
  • the yoke tube 110 is preferably formed to have a larger outer diameter than the yoke shaft 120.
  • Universal joints may be provided at the other end of the yoke tube 110 and the other end of the yoke shaft 120.
  • any one may be connected to the lower end of the steering shaft 20 shown in FIG. 1, The other may be connected to the input shaft 42 shown in FIG. 1.
  • the yoke shaft 120 When a load is applied to the intermediate shaft 100 in the axial direction, the yoke shaft 120 is moved in the axial direction and is inserted into the yoke tube 110 or protruded from the inside of the yoke tube 100 to the outside. Through this, the intermediate shaft 100 may have a variable length in the axial direction.
  • a plurality of first grooves 111 extending in the axial direction may be formed on an inner peripheral surface of one end of the yoke tube 110.
  • the plurality of first grooves 111 may be formed to be elongated in the axial direction.
  • the plurality of first grooves 111 may be disposed to be spaced apart from each other along the circumferential direction. In the present embodiment, it is illustrated that six first grooves 111 are formed, but the number of the plurality of first grooves 111 is not limited to six, and may be formed of at least two.
  • a plurality of second grooves 121 extending in the axial direction may be formed on an outer circumferential surface of one end of the yoke shaft 120.
  • the plurality of second grooves 121 may be formed to be elongated in the axial direction.
  • the plurality of second grooves 121 may be disposed to be spaced apart from each other along the circumferential direction.
  • the plurality of second grooves 121 are illustrated as being formed of six, but the number of the plurality of second grooves 121 is not limited to six, but may be formed of at least two, and the plurality of second grooves 121 is not limited to six. It may be formed in the same number as the number of one groove 111.
  • the plurality of second grooves 121 may be disposed to face each of the plurality of first grooves 111. Accordingly, the first groove 111 and the second groove 121 may form a circular pocket that at least partially surrounds the ball 133 to be described later. Specifically, the first groove 111 may wrap the radially outer side of the ball 133, and the second groove 121 may wrap the radially inner side of the ball 133.
  • a plurality of balls 133 may be inserted into the plurality of first grooves 111 and the plurality of second grooves 121.
  • the plurality of balls 133 may be easily moved when the yoke tube 110 or the yoke shaft 120 is reciprocated in the axial direction.
  • a sleeve member 130 may be disposed between the yoke tube 110 and the yoke shaft 120.
  • the sleeve member 130 may rotatably support a plurality of balls 133.
  • a plurality of ball support portions 130A inserted into a plurality of first grooves 111 and a plurality of second grooves 121 in the sleeve member 130 rotatably support the plurality of balls 133. , 130B) may be formed.
  • the plurality of ball support portions 130A and 130B may be disposed to be spaced apart from each other in the circumferential direction.
  • the sleeve member 130 may include a plurality of ball support portions 130A and 130B and a connection portion 130C connecting the plurality of ball support portions 130A and 130B.
  • connection part 130C is formed in a shape corresponding to the shape of the inner circumferential surface of the yoke tube 110 and the shape of the outer circumferential surface of the yoke shaft 120, so that the outer surface in the radial direction is convex and the inner surface in the radial direction is concave. I can.
  • connection part 130C may connect one side of each of the plurality of ball support parts 130A and 130B in the circumferential direction.
  • the connection portion 130C may be formed in the same number as the plurality of ball support portions 130A, 130B, and in this embodiment, the plurality of ball support portions 130A, 130B are formed of six, and the connection portion 130C is formed of six. do. However, at least two of the plurality of ball support portions 130A and 130B may be formed, and at least two connection portions 130C may be formed. When a plurality of connection portions 130C are formed, they may be disposed to be spaced apart from each other in the circumferential direction.
  • a plurality of ball mounting holes 134 to which a plurality of balls 133 are rotatably mounted may be formed in each of the plurality of ball support portions 130A and 130B.
  • the plurality of ball mounting holes 134 may be disposed to be spaced apart from each other in the axial direction.
  • the plurality of balls 133 are mounted in each of the plurality of ball mounting holes 134, so that the outer surface in the radial direction may contact the inner surface of the first groove 111 of the yoke tube 110, and The inner surface may contact the inner surface of the second groove 121 of the yoke shaft 110.
  • the plurality of ball support portions 130A and 130B may be formed in a column shape having a circular longitudinal section. Therefore, since the plurality of ball mounting holes 134 strongly grasp the plurality of balls 133 respectively mounted in the plurality of ball mounting holes 134, the plurality of balls 133 are formed in the plurality of ball mounting holes 134 It can maintain a stable mounted state.
  • the longitudinal section of the plurality of ball support portions 130A and 130B is not necessarily limited to being formed in a circular shape, The longitudinal sections of the branches 130A and 130B may be formed in an elliptical shape.
  • the plurality of first grooves 111 and the plurality of second grooves 121 may be formed in an arc shape. Therefore, since the first groove 111 and the second groove 121 facing each other form a circular pocket shape, a plurality of ball support portions 130A and 130B having a circular longitudinal section are formed with the first groove 111 and the second groove. It may be inserted and arranged to match the groovy 121.
  • one end of the yoke tube 111 may have an outer diameter smaller than that of the other end of the yoke tube 111. Accordingly, the weight of the yoke tube 111 can be reduced, and further, the weight of the intermediate shaft 110 can be reduced. However, if the outer diameter of one end of the yoke tube 111 is formed smaller than the outer diameter of the other end of the yoke tube 111, the rigidity of the one end of the yoke tube 111 may be weakened.
  • a plurality of reinforcing ribs 115 may protrude on the outer circumferential surface of one end of 110). The plurality of reinforcing ribs 115 may be disposed to be spaced apart from each other along the circumferential direction. The plurality of reinforcing ribs 115 may be formed to be elongated in the axial direction.
  • a plurality of reinforcing ribs 115 are formed in portions corresponding to each of the plurality of first grooves 111, so that the shape of the plurality of first grooves 111 is applied to the load acting on the intermediate shaft 100. It can be prevented from changing easily.
  • a distance between a plurality of ball mounting holes 134 formed in one 130A and a plurality of ball mounting holes 134 formed in the other 130B May be formed differently from each other. That is, the axial positions of the plurality of balls 133 provided on the ball support part 130A and the axial positions of the plurality of balls 133 provided on the ball support part 130B may be differently disposed. Through this, the load acting on the yoke tube 110 and the yoke shaft 120 can be easily distributed, and the position of the load acting on the yoke tube 110 and the yoke shaft 120 may be different depending on the specifications of the vehicle. However, by easily setting the axial positions of the plurality of balls 133, the load acting on the yoke tube 110 and the yoke shaft 120 can be distributed appropriately to the specifications of the vehicle.
  • An elastic pressing part 135 may be formed between the plurality of ball mounting holes 134 in each of the plurality of ball support parts 130A and 130B.
  • the elastic pressing part 135 may have an incision groove 136.
  • the cut groove 136 may be formed to have a length in the circumferential direction at an intermediate point in the axial direction of the elastic pressing part 135. Both sides in the axial direction of the cut groove 136 may be formed to be inclined to widen toward the entrance of the cut groove 136.
  • the elastic pressing unit 135 may have an elastic force acting in the axial direction by the cut groove 136, and the plurality of balls 133 may be provided with a plurality of ball mounting holes 134 by the elastic force of the elastic pressing unit 135. ) May be elastically inserted, and after being inserted into the plurality of ball mounting holes 134, the state of being rotatably mounted in the plurality of ball mounting holes 134 may be maintained.
  • the width in the axial direction of the elastic pressing part 135 may be formed to become narrower toward the outer side in the radial direction. Since the ball mounting hole 134 is provided between the plurality of elastic pressing parts 135, both sides of the ball mounting hole 134 in the axial direction are formed in a shape corresponding to the shape of both sides of the elastic pressing part 135 in the axial direction. .
  • the axial width of the elastic pressing part 135 is formed to become narrower toward the outer side in the radial direction
  • the axial width of the ball mounting hole 134 is formed to become wider toward the outer side in the radial direction, through which the ball mounting hole 134
  • the ball 133 can be easily inserted into the ball, and after the ball 133 is inserted into the ball mounting hole 134, the ball 133 is pressed by both sides of the ball mounting hole 134 in the axial direction, so that the ball ( 133 may maintain a state rotatably mounted in the ball mounting hole 134.
  • both sides of the inlet in the radial direction of the plurality of first grooves 111 and both sides of the inlet in the radial direction of the plurality of second grooves 121 may be spaced apart from the plurality of balls 133. . Accordingly, when the plurality of balls 133 are inserted into the first groove 111 and the second groove 121, the plurality of balls 133 can be smoothly rotated.
  • both sides of the inlet in the radial direction of the plurality of first grooves 111 and both sides of the inlet in the radial direction of the plurality of second grooves 121 may be formed as convex curved surfaces R1, R2, R3, R4. have.
  • the curved surfaces R1, R2, R3, R4 are a first curved surface R1 formed on one side of the entrance in the radial direction of the plurality of first grooves 111, and the other side of the entrance in the radial direction of the plurality of first grooves 111
  • the second curved surface R2 formed in the, a third curved surface R3 formed on one side of the inlet in the radial direction of the plurality of second grooves 121, and the third curved surface R3 formed in the other side of the inlet in the radial direction of the plurality of second grooves 121
  • It may include a fourth curved surface R4.
  • the first curved surface R1 and the third curved surface R3 may be opposed in the radial direction
  • the second curved surface R2 and the fourth curved surface R4 may be opposed in the radial direction.
  • a plurality of first grooves In order to separate both radial entrance sides of the plurality of first grooves 111 and the radial entrance both sides of the plurality of second grooves 121 from the plurality of balls 133, a plurality of first grooves must be Both sides of the inlet in the radial direction of 111 and both sides of the inlet in the radial direction of the plurality of second grooves 121 need not be formed with convex curved surfaces R1, R2, R3, and R4. That is, both sides of the inlet in the radial direction of the plurality of first grooves 111 and both sides of the inlet in the radial direction of the plurality of second grooves 121 may be formed as inclined surfaces that expand toward the inlet in the radial direction.
  • a dust cap 140 may be covered on the outer periphery of one end of the yoke tube 110.
  • the yoke shaft 120 may pass through the dust cap 140 in the axial direction.
  • a through hole may be formed on one surface of the dust cap 140 in the axial direction of the yoke shaft 120 in the axial direction.
  • a locking protrusion 141 may be formed on the inner circumferential surface of the dust cap 140.
  • the locking protrusion 141 may be formed continuously in the circumferential direction on the inner circumferential surface of the dust cap 140 to be formed in a ring shape.
  • a locking protrusion 141 is inserted into an outer circumferential surface of one end of the yoke tube 110 to form a locking groove 113 to be locked.
  • the locking groove 113 may be formed in a shape corresponding to the locking protrusion 141.
  • the locking groove 113 may be formed continuously in a circumferential direction on an outer circumferential surface of one end of the yoke tube 110 to be formed in a ring shape.
  • the dust cap 140 allows foreign matter from the outside of the intermediate shaft 100 to the inside of the intermediate shaft 100 through a gap between one end of the yoke cube 110 and one end of the yoke shaft 120. It can function to prevent inflow.
  • the dust cap 140 blocks the gap between one end of the yoke tube 110 and one end of the yoke shaft 120
  • the yoke tube 110 or the yoke shaft 120 may be moved in the axial direction.
  • the yoke shaft 120 may not be smoothly inserted into the yoke tube 110 due to the air pressure inside the yoke tube 110.
  • the dust cap 140 is formed with an air flow hole 145 communicating with the inner space of the yoke tube 110, so that when the yoke tube 110 or the yoke shaft 120 is moved in the axial direction, the yoke tube 110 ) As the internal air enters and exits through the air flow hole 145, the length change in the axial direction of the intermediate shaft 100 can be made smoothly.
  • the air flow hole 145 may have a size and shape to block foreign substances to the outside as much as possible and allow air to enter and exit into the yoke tube 110.
  • a plurality of air flow holes 145 are formed on one surface of the dust cap 140 in the axial direction, and are formed in an arc shape.
  • the number of air flow holes 145 is spaced apart from each other in the circumferential direction and is provided in three, but the number of air flow holes 145 may be at least one.
  • the intermediate shaft 100 of the vehicle steering system includes the ball support 130A of the sleeve member 130 provided between the yoke tube 110 and the yoke shaft 120, Since 130B) is formed in a columnar shape with a circular longitudinal section, a plurality of balls 133 each mounted in a plurality of ball mounting holes 134 formed in the ball support portions 130A and 130B are inserted into the plurality of ball mounting holes. Since 134 is strongly gripped, the plurality of balls 133 can be stably mounted in the plurality of ball mounting holes 134 to be maintained.
  • the outer diameter of one end of the yoke tube 110 is formed smaller than the outer diameter of the other end of the yoke tube 110, and the yoke tube ( Since the outer circumferential surface of one end of the yoke tube 110 is formed with a plurality of reinforcing ribs 115 corresponding to the first groove 111 formed extending in the axial direction to the inner circumferential surface of the one end of the yoke tube 110, it is light and maintains rigidity. I can.
  • the intermediate shaft 100 of the vehicle steering system is a ball mounting hole formed in any one of the plurality of ball support portions 130A, 130B formed in the sleeve member 130 Since the spacing of 134 and the spacing of the ball mounting hole 134 formed in the other 130B are different, the load acting on the yoke tube 110 and the yoke shaft 120 can be easily distributed.
  • the present invention provides an intermediate shaft of a vehicle steering system capable of maintaining a state in which a plurality of balls are stably mounted in a plurality of ball mounting holes formed in a ball support portion of a sleeve member.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • General Engineering & Computer Science (AREA)
  • Ocean & Marine Engineering (AREA)
  • Steering Controls (AREA)
  • Power Steering Mechanism (AREA)
  • Steering-Linkage Mechanisms And Four-Wheel Steering (AREA)

Abstract

An intermediate shaft of a vehicle steering system according to the present invention comprises: a yoke tube in which a plurality of first grooves extending in the axial direction on the inner peripheral surface of one end thereof are formed to be spaced apart from each other along the circumferential direction; a yoke shaft in which a plurality of second grooves respectively opposed to the plurality of first grooves extend in the axial direction and are formed to be spaced apart from each other along the circumferential direction on the outer circumferential surface of one end thereof inserted into one end of the yoke tube; a plurality of balls inserted into the plurality of first grooves and the plurality of second grooves; and a sleeve member which is disposed between the yoke tube and the yoke shaft so as to rotatably support the plurality of balls. The sleeve member includes a plurality of ball support portions in which a plurality of ball mounting holes in which the plurality of balls are rotatably mounted are formed to be spaced apart from each other in the axial direction, and the plurality of ball support portions are formed in a columnar shape having a circular longitudinal section, such that the plurality of balls can be stably mounted and maintained in the plurality of ball mounting holes.

Description

차량 조향시스템의 인터미디어트 샤프트Intermediate shaft of vehicle steering system
본 발명은 차량 조향시스템의 인터미디어트 샤프트(INTERMEDIATE SHAFT OF VEHICLE STEERING SYSTEM)에 관한 것으로서, 보다 상세하게는 축방향으로 길이변화가 가능하도록 구성됨과 아울러, 내부에 구비된 복수개의 볼에 의해 축방향으로 길이가 원활하게 변화되는 차량 조향시스템의 인터미디어트 샤프트에 관한 것이다.The present invention relates to an INTERMEDIATE SHAFT OF VEHICLE STEERING SYSTEM of a vehicle steering system, and in more detail, it is configured to change the length in the axial direction, and in the axial direction by a plurality of balls provided therein. It relates to an intermediate shaft of a vehicle steering system whose length is smoothly changed.
일반적인 차량 조향시스템은 운전자가 스티어링 휠을 좌우 회전시키는 방향으로 차륜을 조향하는 시스템으로서, 상기 스티어링 휠이 상단에 설치되는 스티어링 샤프트와, 상기 스티어링 샤프트의 하단에 유니버셜 조인트를 통해 결합된 인터미디어트 샤프트와, 상기 인터미디어트 사프트의 하단에 유니버셜 조인트를 통해 결합된 피니언 샤프트와, 상기 피니언 샤프트에 형성된 피니언에 치합하는 랙을 가지는 스티어링 기어를 포함한다.A general vehicle steering system is a system that steers a wheel in a direction in which the driver rotates the steering wheel left and right, and the steering shaft on which the steering wheel is installed at the top, and an intermediate shaft coupled to the bottom of the steering shaft through a universal joint. And a steering gear having a pinion shaft coupled to a lower end of the intermediate shaft through a universal joint, and a rack engaging a pinion formed on the pinion shaft.
운전자가 상기 스티어링 휠을 회전시키면, 상기 스티어링 샤프트, 상기 인터미디어트 샤프트 및 상기 피니언 샤프트가 상기 스티어링 휠과 같은 방향으로 함께 회전되고, 이에 따라 상기 스티어링 기어에 포함된 랙바가 좌우 직선 이동되어서, 상기 랙바의 양단에 각각 결합된 타이로드가 차륜의 휠에 결합된 너클을 회전시키는 것에 의해, 상기 차륜이 상기 스티어링 휠의 회전방향으로 조향된다.When the driver rotates the steering wheel, the steering shaft, the intermediate shaft, and the pinion shaft are rotated together in the same direction as the steering wheel, and accordingly, the rack bar included in the steering gear is moved horizontally and linearly, so that the The wheel is steered in the rotation direction of the steering wheel by rotating the knuckle connected to the wheel of the wheel by tie rods respectively coupled to both ends of the rack bar.
한편, 운전자가 상기 스티어링 휠을 회전시킬 때, 적은 힘으로 회전시킬 수 있도록, 상기 조향시스템에는 파워 스티어링 장치가 설치된다.On the other hand, when the driver rotates the steering wheel, a power steering device is installed in the steering system so that the steering wheel can be rotated with a small force.
상기 파워 스티어링 장치는, 운전자가 상기 스티어링 휠을 회전시킬 때 운전자의 조향 의도, 크기 및 방향을 검출하는 센서의 검출값에 따라, 상기 피니언 샤프트에 설치된 전동 모터가 제어되어 상기 전동 모터가 상기 피니언 샤프트를 회전시킴으로써, 운전자는 적은 힘으로도 상기 스티어링 휠을 회전시킬 수 있다.In the power steering apparatus, an electric motor installed on the pinion shaft is controlled according to a detection value of a sensor that detects the driver's steering intention, size, and direction when the driver rotates the steering wheel, so that the electric motor is the pinion shaft. By rotating, the driver can rotate the steering wheel with little force.
도 1은 파워 스티어링 장치가 설치된 차량 조향시스템을 나타내는 도면이다.1 is a diagram showing a vehicle steering system in which a power steering device is installed.
도 1을 참조하면, 파워 스티어링 장치(40)가 설치된 차량 조향시스템은, 상기 일반적인 차량 조향시스템에 파워 스티어링 장치(40)가 추가로 장착된 시스템으로서, 스티어링 컬럼(10)과, 스티어링 샤프트(20)와, 인터미디어트 사프트(30)와, 파워 스티어링 장치(40)와, 스티어링 기어(50)를 포함할 수 있다.Referring to FIG. 1, a vehicle steering system in which a power steering device 40 is installed is a system in which a power steering device 40 is additionally mounted on the general vehicle steering system, and includes a steering column 10 and a steering shaft 20. ), an intermediate shaft 30, a power steering device 40, and a steering gear 50.
스티어링 컬럼(10)의 외주에는 브라켓이 설치될 수 있고, 상기 브라켓은 차체에 결합되어 스티어링 컬럼(10)을 지지할 수 있다. 스티어링 컬럼(10)은 스티어링 샤프트(20)를 회전 가능하게 지지할 수 있다.A bracket may be installed on the outer periphery of the steering column 10, and the bracket may be coupled to a vehicle body to support the steering column 10. The steering column 10 may rotatably support the steering shaft 20.
스티어링 샤프트(20)는 스티어링 컬럼(10)을 상하로 관통할 수 있다. 스티어링 샤프트(20)의 상단은 스티어링 컬럼(10)의 상단으로 돌출 배치될 수 있고, 스티어링 샤프트(20)의 하단은 스티어링 컬럼(10)의 하단으로 돌출 배치될 수 있다.The steering shaft 20 may vertically penetrate the steering column 10. The upper end of the steering shaft 20 may protrude to the upper end of the steering column 10, and the lower end of the steering shaft 20 may protrude toward the lower end of the steering column 10.
스티어링 샤프트(20)의 상단에는 차량의 차륜을 조향하기 위해 운전자가 손으로 잡고 좌측 또는 우측으로 회전시키는 구성인 상기 스티어링 휠(미도시)이 결합될 수 있다.The steering wheel (not shown) may be coupled to an upper end of the steering shaft 20, which is a configuration that the driver holds by hand and rotates to the left or right to steer the wheel of the vehicle.
스티어링 샤프트(20)의 하단은 어퍼 유니버셜 조인트(31)를 통해 인터미디어트 샤프트(30)와 결합될 수 있다. 즉, 인터미디어트 샤프트(30)의 상단은 어퍼 유니버셜 조인트(31)를 통해 스티어링 샤프트(20)의 하단과 결합될 수 있다.The lower end of the steering shaft 20 may be coupled to the intermediate shaft 30 through the upper universal joint 31. That is, the upper end of the intermediate shaft 30 may be coupled to the lower end of the steering shaft 20 through the upper universal joint 31.
인터미디어트 샤프트(30)의 하단은 로워 유니버셜 조인트(32)를 통해 파워 스티어링 장치(40)의 입력축(42)과 결합될 수 있다. 즉, 파워 스티어링 장치(40)의 입력축(42)은 파워 스티어링 장치(40)의 상단으로 돌출 배치되어서, 인터미디어트 샤프트(30)의 하단에 로워 유니버셜 조인트(32)를 통해 결합될 수 있다.The lower end of the intermediate shaft 30 may be coupled to the input shaft 42 of the power steering device 40 through the lower universal joint 32. That is, the input shaft 42 of the power steering device 40 is disposed to protrude from the upper end of the power steering device 40 and may be coupled to the lower end of the intermediate shaft 30 through the lower universal joint 32.
인터미디어트 샤프트(30)는 스티어링 샤프트(20)로부터 전달되는 회전력을 파워 스티어링 장치(40)의 입력축(42)으로 전달할 수 있다.The intermediate shaft 30 may transmit the rotational force transmitted from the steering shaft 20 to the input shaft 42 of the power steering device 40.
파워 스티어링 장치(40)의 하단에는 상기 피니언 샤프트(미도시)가 돌출 배치될 수 있다. 상기 피니언 샤프트의 외주에는 상기 피니언 기어가 형성될 수 있다. 상기 피니언 샤프트는 스티어링 기어(50)의 하우징(51)에 돌출 형성된 중공의 파워 스티어링 장치 장착부(55) 내부로 삽입될 수 있고, 이러한 상태에서 상기 피니언 기어는 스티어링 기어(50)의 하우징(51) 내부에 좌우로 이동가능하게 배치된 랙바(52)에 형성된 랙(미도시)과 치합할 수 있다.The pinion shaft (not shown) may be protruded at the lower end of the power steering device 40. The pinion gear may be formed on the outer periphery of the pinion shaft. The pinion shaft may be inserted into the hollow power steering device mounting portion 55 protruding from the housing 51 of the steering gear 50, and in this state, the pinion gear is the housing 51 of the steering gear 50 It may engage with a rack (not shown) formed on the rack bar 52 disposed to be movable left and right inside.
랙바(52)의 좌우양단에는 각각 타이로드(53, 54)가 결합될 수 있다. 타이로드(53, 54)는, 좌측 차륜의 너클에 연결되는 좌측 타이로드(53)와, 우측 차륜의 너클에 연결되는 우측 타이로드(54)를 포함할 수 있다. Tie rods 53 and 54 may be coupled to the left and right ends of the rack bar 52, respectively. The tie rods 53 and 54 may include a left tie rod 53 connected to a knuckle of a left wheel, and a right tie rod 54 connected to a knuckle of a right wheel.
상기 피니언 샤프트가 일방향으로 회전되는 경우 랙바(52)가 좌측으로 직선 이동될 수 있고, 이에 따라 좌측 타이로드(53) 및 우측 타이로드(54)가 좌측으로 직선 이동되어 좌우측 차륜에 각각 결합된 너클을 좌측으로 회전시키는 것에 의해, 좌우측 차륜은 좌측으로 조향될 수 있다.When the pinion shaft is rotated in one direction, the rack bar 52 may be linearly moved to the left, and accordingly, the left tie rod 53 and the right tie rod 54 are linearly moved to the left, and the knuckle coupled to the left and right wheels, respectively. By rotating to the left, the left and right wheels can be steered to the left.
또한, 상기 피니언 샤프트가 타방향으로 회전되는 경우 랙바(52)가 우측으로 직선 이동될 수 있고, 이에 따라 좌측 타이로드(53) 및 우측 타이로드(54)가 우측으로 직선 이동되어 좌우측 차륜에 각각 결합된 상기 너클을 우측으로 회전시키는 것에 의해, 좌우측 차륜은 우측으로 조향될 수 있다.In addition, when the pinion shaft is rotated in the other direction, the rack bar 52 may be linearly moved to the right, and accordingly, the left tie rod 53 and the right tie rod 54 are linearly moved to the right to each of the left and right wheels. By rotating the combined knuckle to the right, the left and right wheels can be steered to the right.
한편, 인터미디어트 샤프트(30)는, 일단부가 중공으로 요크 튜브와, 상기 중공으로 일단부가 삽입되는 요크 샤프트로 구성되어서, 축방향으로 작용하는 하중에 의해, 상기 요크 튜브 또는 상기 요크 샤프트가 축방향으로 슬립되면서 길이가 가변되도록 구성되기도 한다.Meanwhile, the intermediate shaft 30 is composed of a yoke tube having one end hollow and a yoke shaft having one end inserted into the hollow, so that the yoke tube or the yoke shaft is axially driven by a load acting in the axial direction. It is also configured so that the length is variable while slipping in the direction.
인터미디어트 샤프트(30)가 상기 요크 튜브 및 상기 요크 샤프트로 구성되는 경우, 상기 요크 튜브 및 상기 요크 샤프트 사이에는 복수개의 볼이 설치되어, 상기 요크 튜브 또는 상기 요크 샤프트가 상기 복수개의 볼에 의해 축방향으로 쉽게 슬립되도록 할 수 있다.When the intermediate shaft 30 is composed of the yoke tube and the yoke shaft, a plurality of balls are installed between the yoke tube and the yoke shaft, so that the yoke tube or the yoke shaft is formed by the plurality of balls. It can be easily slipped in the axial direction.
그런데, 종래 기술에 따른 차량 조향시스템의 인터미디어트 샤프트는, 시간이 지남에 따라 상기 복수개의 볼 또는 상기 복수개의 볼의 주변부품에서 녹이 발생되어 상기 복수개의 볼의 회전 기능이 저하하면서, 상기 복수개의 볼이 주변부품에서 이탈되거나, 상기 주변부품이 파손되는 등 내구도가 저하되는 문제점이 있었다.However, in the intermediate shaft of the vehicle steering system according to the prior art, rust is generated in the plurality of balls or peripheral parts of the plurality of balls over time, so that the rotation function of the plurality of balls decreases, and the plurality of balls There is a problem in that durability is deteriorated, such as the dog's balls are separated from the peripheral parts or the peripheral parts are damaged.
본 발명의 기술적 과제는, 복수개의 볼이 슬리브 부재의 볼지지부에 형성된 복수개의 볼장착홀에 안정적으로 장착된 상태를 유지할 수 있는 차량 조향시스템의 인터미디어트 샤프트를 제공하는 것이다.It is an object of the present invention to provide an intermediate shaft of a vehicle steering system capable of stably maintaining a state in which a plurality of balls are stably mounted in a plurality of ball mounting holes formed in a ball support portion of a sleeve member.
본 발명의 다른 기술적 과제는, 가벼우면서도 강성을 유지할 수 있는 차량 조향시스템의 인터미디어트 샤프트를 제공하는 것이다.Another technical problem of the present invention is to provide an intermediate shaft of a vehicle steering system capable of maintaining rigidity while being light.
본 발명의 또 다른 기술적 과제는, 작용 하중의 분산이 용이한 차량 조향시스템의 인터미디어트 샤프트를 제공하는 것이다.Another technical problem of the present invention is to provide an intermediate shaft of a vehicle steering system in which an applied load can be easily distributed.
본 발명의 기술적 과제는 이상에서 언급한 과제로 제한되지 않으며, 언급되지 않은 또 다른 과제들은 아래의 기재로부터 당업자에게 명확하게 이해될 수 있을 것이다.The technical problem of the present invention is not limited to the problems mentioned above, and other problems that are not mentioned will be clearly understood by those skilled in the art from the following description.
상기 과제를 달성하기 위하여, 본 발명에 따른 차량 조향시스템의 인터미디어트 샤프트는, 요크 튜브, 요크 샤프트, 복수개의 볼 및 슬리브 부재로 구성된다. 상기 요크 튜브의 일단부 내주면에는 축방향으로 연장되는 복수개의 제1 그루브가 형성된다. 상기 복수개의 제1 그루브는 원주방향을 따라 서로 이격되어 배치된다. 상기 요크 샤프트의 일단부는 상기 요크 튜브의 일단부 내로 삽입된다. 상기 요크 샤프트의 일단부 외주면에는 상기 복수개의 제1 그루브와 각각 대향되는 복수개의 제2 그루브가 축방향으로 연장되게 형성된다. 상기 복수개의 제2 그루브는 원주방향을 따라 서로 이격되어 배치된다. 상기 복수개의 볼은 상기 복수개의 제1 그루브 및 상기 복수개의 제2 그루브에 삽입된다. 상기 슬리브 부재는 상기 요크 튜브 및 상기 요크 샤프트 사이에 배치되어 상기 복수개의 볼을 회전 가능하게 지지한다. 상기 슬리브 부재에는 상기 복수개의 제1 그루브 및 상기 복수개의 제2 그루브에 삽입되어 상기 복수개의 볼을 회전 가능하게 지지하는 복수개의 볼지지부가 형성된다. 상기 복수개의 볼지지부는 원주방향으로 서로 이격되어 배치된다. 상기 복수개의 볼지지부 각각에는 상기 복수개의 볼이 회전 가능하게 장착되는 복수개의 볼장착홀이 형성된다. 상기 복수개의 볼장착홀은 축방향으로 서로 이격되어 배치된다. 상기 복수개의 볼지지부는 종단면이 원형인 기둥형상으로 형성된다.In order to achieve the above object, the intermediate shaft of the vehicle steering system according to the present invention is composed of a yoke tube, a yoke shaft, a plurality of balls and a sleeve member. A plurality of first grooves extending in the axial direction are formed on an inner circumferential surface of one end of the yoke tube. The plurality of first grooves are disposed to be spaced apart from each other along the circumferential direction. One end of the yoke shaft is inserted into one end of the yoke tube. A plurality of second grooves facing each of the plurality of first grooves are formed to extend in an axial direction on an outer peripheral surface of one end of the yoke shaft. The plurality of second grooves are disposed to be spaced apart from each other along the circumferential direction. The plurality of balls are inserted into the plurality of first grooves and the plurality of second grooves. The sleeve member is disposed between the yoke tube and the yoke shaft to rotatably support the plurality of balls. The sleeve member is provided with a plurality of ball support portions inserted into the plurality of first grooves and the plurality of second grooves to rotatably support the plurality of balls. The plurality of ball support portions are disposed to be spaced apart from each other in the circumferential direction. Each of the plurality of ball support portions is formed with a plurality of ball mounting holes through which the plurality of balls are rotatably mounted. The plurality of ball mounting holes are disposed to be spaced apart from each other in the axial direction. The plurality of ball support portions are formed in a columnar shape having a circular longitudinal section.
상기 복수개의 볼지지부는 종단면이 타원형으로 형성될 수 있다.The plurality of ball support portions may have an elliptical longitudinal cross section.
상기 복수개의 제1 그루브 및 상기 복수개의 제2 그루브는 원호형상으로 형성될 수 있다.The plurality of first grooves and the plurality of second grooves may be formed in an arc shape.
상기 요크 튜브의 일단부는 상기 요크 튜브의 타단부에 비해 외경이 작게 형성될 수 있다. 상기 요크 튜브의 일단부 외주면에는 상기 복수개의 제1 그루브에 각각 대응하는 부분에 축방향으로 연장되는 복수개의 보강리브가 돌출 형성될 수 있다. 상기 복수개의 보강리브는 원주방향을 따라 서로 이격되어 배치될 수 있다.One end of the yoke tube may have an outer diameter smaller than that of the other end of the yoke tube. A plurality of reinforcing ribs extending in the axial direction may protrude from portions corresponding to each of the plurality of first grooves on an outer circumferential surface of one end of the yoke tube. The plurality of reinforcing ribs may be disposed to be spaced apart from each other along the circumferential direction.
상기 복수개의 볼지지부 중, 어느 하나에 형성된 상기 복수개의 볼장착홀의 간격과, 다른 하나에 형성된 상기 복수개의 볼장착홀의 간격은, 서로 다르게 형성될 수 있다.A spacing of the plurality of ball mounting holes formed in one of the plurality of ball support portions and a spacing of the plurality of ball mounting holes formed in the other may be formed differently from each other.
상기 복수개의 볼지지부 각각에는 상기 복수개의 볼장착홀 사이에 탄성가압부가 형성될 수 있다. 상기 탄성가압부는 절개홈을 가질 수 있다. 상기 복수개의 볼은 상기 탄성가압부의 탄성력에 의해 상기 복수개의 볼장착홀에 탄력적으로 삽입될 수 있다.Each of the plurality of ball support parts may have an elastic pressing part formed between the plurality of ball mounting holes. The elastic pressing part may have a cutout groove. The plurality of balls may be elastically inserted into the plurality of ball mounting holes by the elastic force of the elastic pressing unit.
상기 복수개의 제1 그루브의 반경방향의 입구 양측과, 상기 복수개의 제2 그루브의 반경방향의 입구 양측은, 상기 복수개의 볼과 이격될 수 있다.Both sides of the inlet of the plurality of first grooves in the radial direction and both sides of the inlet of the plurality of second grooves in the radial direction may be spaced apart from the plurality of balls.
상기 복수개의 제1 그루브의 반경방향의 입구 양측과, 상기 복수개의 제2 그루브의 반경방향의 입구 양측은, 볼록한 곡면으로 형성될 수 있다.Both sides of the inlet of the plurality of first grooves in the radial direction and both sides of the inlet of the plurality of second grooves in the radial direction may have a convex curved surface.
상기 복수개의 제1 그루브의 반경방향의 입구 양측과, 상기 복수개의 제2 그루브의 반경방향의 입구 양측은, 상기 반경방향의 입구로 갈수록 벌어지는 경사면으로 형성될 수 있다.Both sides of the inlet in the radial direction of the plurality of first grooves and both sides of the inlet in the radial direction of the plurality of second grooves may be formed as inclined surfaces that expand toward the inlet in the radial direction.
상기 탄성가압부의 축방향 폭은 반경방향 외측으로 갈수록 좁아지게 형성될 수 있다.The axial width of the elastic pressing unit may be formed to be narrower toward the outer side in the radial direction.
상기 요크 튜브의 일단부 외주에는 더스트 캡이 씌워질 수 있다. 상기 더스트 캡에는 상기 요크 샤프트가 관통할 수 있다. 상기 더스트 캡에는 상기 요크 튜브의 내부공간과 통하는 공기유동홀이 형성될 수 있다.A dust cap may be covered on the outer periphery of one end of the yoke tube. The yoke shaft may pass through the dust cap. An air flow hole communicating with the inner space of the yoke tube may be formed in the dust cap.
상기 공기유동홀은 상기 더스트 캡의 축방향 일면에 복수개의 원호형으로 형성될 수 있다.The air flow hole may be formed in a plurality of arc shapes on one surface of the dust cap in the axial direction.
기타 실시예의 구체적인 사항들은 상세한 설명 및 도면들에 포함되어 있다.Details of other embodiments are included in the detailed description and drawings.
본 발명에 따른 차량 조향시스템의 인터미디어트 샤프트는, 요크 튜브 및 요크 샤프트 사이에 구비된 슬리브 부재의 볼지지부는 종단면이 원형인 기둥형상으로 형성되어 있기 때문에, 상기 볼지지부에 형성된 복수개의 볼장착홀에 각각 장착된 복수개의 볼을 상기 복수개의 볼장착홀이 강하게 움켜쥐게 되므로, 상기 복수개의 볼이 상기 복수개의 볼장착홀에 안정적으로 장착된 상태를 유지할 수 있는 효과가 있다.In the intermediate shaft of the vehicle steering system according to the present invention, since the ball support portion of the sleeve member provided between the yoke tube and the yoke shaft is formed in a column shape having a circular longitudinal section, a plurality of balls are mounted on the ball support portion. Since the plurality of ball mounting holes strongly grip the plurality of balls each mounted in the hole, there is an effect of maintaining a state in which the plurality of balls are stably mounted in the plurality of ball mounting holes.
또한, 본 발명에 따른 차량 조향시스템의 인터미디어트 샤프트는, 상기 요크 튜브의 일단부 외경이 상기 요크 튜브의 타단부 외경보다 작게 형성되어 있고, 상기 요크 튜브의 일단부 외주면에는 상기 요크 튜브의 일단부 내주면에 축방향으로 연장되어 형성된 제1 그루브와 대응하는 복수개의 보강리브가 형성되어 있기 때문에, 가벼우면서도 강성을 유지할 수 있는 효과도 있다.In addition, in the intermediate shaft of the vehicle steering system according to the present invention, an outer diameter of one end of the yoke tube is formed smaller than an outer diameter of the other end of the yoke tube, and one end of the yoke tube is formed on an outer circumferential surface of one end of the yoke tube. Since a plurality of reinforcing ribs corresponding to the first groove formed extending in the axial direction are formed on the inner peripheral surface of the unit, there is also an effect of maintaining rigidity while being light.
또한, 본 발명에 따른 차량 조향시스템의 인터미디어트 샤프트는, 상기 슬리브 부재에 형성된 복수개의 볼지지부 중, 어느 하나에 형성된 볼장착홀의 간격과, 다른 하나에 형성된 볼장착홀의 간격이 상이하므로, 상기 요크 튜브 및 상기 요크 샤프트에 작용하는 하중을 쉽게 분산시킬 수 있는 효과도 있다.In addition, in the intermediate shaft of the vehicle steering system according to the present invention, the spacing of the ball mounting hole formed in one of the plurality of ball support portions formed in the sleeve member is different from the spacing of the ball mounting hole formed in the other. There is also an effect of easily distributing the load acting on the yoke tube and the yoke shaft.
본 발명의 효과는 이상에서 언급한 효과로 제한되지 않으며, 언급되지 않은 또 다른 효과들은 청구범위의 기재로부터 당업자에게 명확하게 이해될 수 있을 것이다.The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.
도 1은 파워 스티어링 장치가 설치된 차량 조향시스템을 나타내는 도면,1 is a view showing a vehicle steering system in which a power steering device is installed;
도 2는 본 발명의 실시예에 의한 차량 조향시스템의 인터미디어트 샤프트를 나타내는 사시도,2 is a perspective view showing an intermediate shaft of a vehicle steering system according to an embodiment of the present invention;
도 3은 본 발명의 실시예에 의한 차량 조향시스템의 인터미디어트 샤프트에서 요크 튜브의 일부를 절개한 사시도,3 is a perspective view showing a part of a yoke tube in an intermediate shaft of a vehicle steering system according to an embodiment of the present invention;
도 4는 도 3의 일부 확대도,Figure 4 is a partially enlarged view of Figure 3,
도 5는 도 2의 A-A선에 따른 단면을 확대한 도면,5 is an enlarged view of a cross section taken along line A-A of FIG. 2;
도 6은 도 5의 확대도를 더욱 확대한 도면,6 is a further enlarged view of the enlarged view of FIG. 5;
도 7은 도 3을 다른 각도에서 보이는 일부 사시도이다.7 is a partial perspective view of FIG. 3 viewed from a different angle.
이하, 본 발명의 실시예에 의한 차량 조향시스템의 인터미디어트 샤프트를 도면들을 참고하여 설명하도록 한다.Hereinafter, an intermediate shaft of a vehicle steering system according to an embodiment of the present invention will be described with reference to the drawings.
도 2는 본 발명의 실시예에 의한 차량 조향시스템의 인터미디어트 샤프트를 나타내는 사시도, 도 3은 본 발명의 실시예에 의한 차량 조향시스템의 인터미디어트 샤프트에서 요크 튜브의 일부를 절개한 사시도, 도 4는 도 3의 일부 확대도, 도 5는 도 2의 A-A선에 따른 단면을 확대한 도면, 도 6은 도 5의 확대도를 더욱 확대한 도면, 도 7은 도 3을 다른 각도에서 보이는 일부 사시도이다.FIG. 2 is a perspective view showing an intermediate shaft of a vehicle steering system according to an embodiment of the present invention, and FIG. 3 is a perspective view showing a part of a yoke tube in the intermediate shaft of a vehicle steering system according to an embodiment of the present invention; FIG. 4 is a partially enlarged view of FIG. 3, FIG. 5 is an enlarged view of a cross section taken along line AA of FIG. 2, FIG. 6 is a further enlarged view of FIG. 5, and FIG. 7 is a view of FIG. 3 from a different angle. It is a partial perspective view.
도 2 내지 도 7을 참조하면, 본 발명의 실시예에 의한 인터미디어트 샤프트(100)는 요크 튜브(110) 및 요크 샤프트(120)를 포함할 수 있다.2 to 7, the intermediate shaft 100 according to an embodiment of the present invention may include a yoke tube 110 and a yoke shaft 120.
요크 샤프트(120)의 일단부는 요크 튜브(110)의 일단부 내로 삽입될 수 있다. 요크 튜브(110)의 일단부는 중공으로 형성될 수 있고, 요크 샤프트(120)의 일단부는 요크 튜브(110)의 중공으로 삽입되어, 축방향으로 왕복 이동 가능하게 구비될 수 있다.One end of the yoke shaft 120 may be inserted into one end of the yoke tube 110. One end of the yoke tube 110 may be formed as a hollow, and one end of the yoke shaft 120 may be inserted into the hollow of the yoke tube 110 and may be provided to be reciprocated in the axial direction.
요크 샤프트(120)가 축방향으로 왕복 이동 가능하기 위해, 요크 튜브(110)는 요크 샤프트(120)보다 외경이 크게 형성되는 것이 바람직하다.In order for the yoke shaft 120 to reciprocate in the axial direction, the yoke tube 110 is preferably formed to have a larger outer diameter than the yoke shaft 120.
요크 튜브(110)의 타단부와, 요크 샤프트(120)의 타단부에는 각각 유니버셜 조인트(도면부호 미표기)가 구비될 수 있다. 요크 튜브(110)의 타단부에 구비되는 유니버셜 조인트와, 요크 샤프트(120)의 타단부에 구비되는 유니버셜 조인트 중, 어느 하나는 도 1에 도시된 스티어링 샤프트(20)의 하단부에 연결될 수 있고, 다른 하나는 도 1에 도시된 입력축(42)에 연결될 수 있다.Universal joints (not shown) may be provided at the other end of the yoke tube 110 and the other end of the yoke shaft 120. Among the universal joint provided at the other end of the yoke tube 110 and the universal joint provided at the other end of the yoke shaft 120, any one may be connected to the lower end of the steering shaft 20 shown in FIG. 1, The other may be connected to the input shaft 42 shown in FIG. 1.
인터미디어트 샤프트(100)에 축방향으로 하중이 작용하게 되면, 요크 샤프트(120)가 축방향으로 이동되면서 요크 튜브(110)의 내부로 삽입되거나 요크 튜브(100)의 내부에서 외부로 돌출될 수 있으며, 이를 통해 인터미디어트 샤프트(100)는 축방향으로 길이가 가변될 수 있다.When a load is applied to the intermediate shaft 100 in the axial direction, the yoke shaft 120 is moved in the axial direction and is inserted into the yoke tube 110 or protruded from the inside of the yoke tube 100 to the outside. Through this, the intermediate shaft 100 may have a variable length in the axial direction.
요크 튜브(110)의 일단부 내주면에는 축방향으로 연장되는 복수개의 제1 그루브(111)가 형성될 수 있다. 복수개의 제1 그루브(111)는 축방향으로 길게 형성될 수 있다. 복수개의 제1 그루브(111)는 원주방향을 따라 서로 이격되어 배치될 수 있다. 본 실시예에서 복수개의 제1 그루브(111)는 6개가 형성되는 것으로 예시되어져 있으나, 복수개의 제1 그루브(111)의 개수는 6개로 한정되지 않고, 적어도 2개로 형성될 수 있다.A plurality of first grooves 111 extending in the axial direction may be formed on an inner peripheral surface of one end of the yoke tube 110. The plurality of first grooves 111 may be formed to be elongated in the axial direction. The plurality of first grooves 111 may be disposed to be spaced apart from each other along the circumferential direction. In the present embodiment, it is illustrated that six first grooves 111 are formed, but the number of the plurality of first grooves 111 is not limited to six, and may be formed of at least two.
요크 샤프트(120)의 일단부 외주면에는 축방향으로 연장되는 복수개의 제2 그루브(121)가 형성될 수 있다. 복수개의 제2 그루브(121)는 축방향으로 길게 형성될 수 있다. 복수개의 제2 그루브(121)는 원주방향을 따라 서로 이격되어 배치될 수 있다. 본 실시예에서 복수개의 제2 그루브(121)는 6개가 형성되는 것으로 예시되어져 있으나, 복수개의 제2 그루브(121)의 개수는 6개로 한정되지 않고, 적어도 2개로 형성될 수 있으며, 복수개의 제1 그루브(111)의 개수와 동일한 개수로 형성될 수 있다.A plurality of second grooves 121 extending in the axial direction may be formed on an outer circumferential surface of one end of the yoke shaft 120. The plurality of second grooves 121 may be formed to be elongated in the axial direction. The plurality of second grooves 121 may be disposed to be spaced apart from each other along the circumferential direction. In the present embodiment, the plurality of second grooves 121 are illustrated as being formed of six, but the number of the plurality of second grooves 121 is not limited to six, but may be formed of at least two, and the plurality of second grooves 121 is not limited to six. It may be formed in the same number as the number of one groove 111.
복수개의 제2 그루브(121)는 복수개의 제1 그루브(111)와 각각 대향되게 배치될 수 있다. 따라서, 제1 그루브(111) 및 제2 그루브(121)는 후술할 볼(133)을 적어도 일부 감싸는 원형의 포켓을 형성할 수 있다. 구체적으로, 제1 그루브(111)는 볼(133)의 반경방향 외측을 감쌀 수 있고, 제2 그루브(121)는 볼(133)의 반경방향 내측을 감쌀 수 있다.The plurality of second grooves 121 may be disposed to face each of the plurality of first grooves 111. Accordingly, the first groove 111 and the second groove 121 may form a circular pocket that at least partially surrounds the ball 133 to be described later. Specifically, the first groove 111 may wrap the radially outer side of the ball 133, and the second groove 121 may wrap the radially inner side of the ball 133.
복수개의 제1 그루브(111) 및 복수개의 제2 그루브(121)에는 복수개의 볼(133)이 삽입될 수 있다. 복수개의 볼(133)은 요크 튜브(110) 또는 요크 샤프트(120)가 축방향으로 왕복 이동될 때 쉽게 이동되도록 할 수 있다.A plurality of balls 133 may be inserted into the plurality of first grooves 111 and the plurality of second grooves 121. The plurality of balls 133 may be easily moved when the yoke tube 110 or the yoke shaft 120 is reciprocated in the axial direction.
요크 튜브(110) 및 요크 샤프트(120) 사이에는 슬리브 부재(130)가 배치될 수 있다. 슬리브 부재(130)는 복수개의 볼(133)을 회전 가능하게 지지할 수 있다.A sleeve member 130 may be disposed between the yoke tube 110 and the yoke shaft 120. The sleeve member 130 may rotatably support a plurality of balls 133.
도 4를 참조하면, 슬리브 부재(130)에는 복수개의 제1 그루브(111) 및 복수개의 제2 그루브(121)에 삽입되어 복수개의 볼(133)을 회전 가능하게 지지하는 복수개의 볼지지부(130A, 130B)가 형성될 수 있다. 복수개의 볼지지부(130A, 130B)는 원주방향으로 서로 이격되어 배치될 수 있다. Referring to FIG. 4, a plurality of ball support portions 130A inserted into a plurality of first grooves 111 and a plurality of second grooves 121 in the sleeve member 130 rotatably support the plurality of balls 133. , 130B) may be formed. The plurality of ball support portions 130A and 130B may be disposed to be spaced apart from each other in the circumferential direction.
즉, 슬리브 부재(130)는, 복수개의 볼지지부(130A, 130B)와, 복수개의 볼지지부(130A, 130B) 사이를 연결하는 연결부(130C)를 포함할 수 있다.That is, the sleeve member 130 may include a plurality of ball support portions 130A and 130B and a connection portion 130C connecting the plurality of ball support portions 130A and 130B.
연결부(130C)는 요크 튜브(110)의 내주면 형상 및 요크 샤프트(120)의 외주면 형상과 대응되는 형상으로 형성되어, 반경방향의 외측면이 볼록하고 반경방향의 내측면이 오목하게 만곡되어 형성될 수 있다.The connection part 130C is formed in a shape corresponding to the shape of the inner circumferential surface of the yoke tube 110 and the shape of the outer circumferential surface of the yoke shaft 120, so that the outer surface in the radial direction is convex and the inner surface in the radial direction is concave. I can.
연결부(130C)는 복수개의 볼지지부(130A, 130B) 각각의 원주방향 일측을 연결할 수 있다. 연결부(130C)는 복수개의 볼지지부(130A, 130B)와 동일한 개수로 형성될 수 있으며, 본 실시예에서 복수개의 볼지지부(130A, 130B)는 6개로 형성되고, 연결부(130C)는 6개로 형성된다. 다만, 복수개의 볼지지부(130A, 130B)는 적어도 2개로 형성될 수 있으며, 연결부(130C)도 적어도 2개로 형성될 수 있다. 연결부(130C)는 복수개로 형성되는 경우, 원주방향으로 서로 이격되어 배치될 수 있다.The connection part 130C may connect one side of each of the plurality of ball support parts 130A and 130B in the circumferential direction. The connection portion 130C may be formed in the same number as the plurality of ball support portions 130A, 130B, and in this embodiment, the plurality of ball support portions 130A, 130B are formed of six, and the connection portion 130C is formed of six. do. However, at least two of the plurality of ball support portions 130A and 130B may be formed, and at least two connection portions 130C may be formed. When a plurality of connection portions 130C are formed, they may be disposed to be spaced apart from each other in the circumferential direction.
복수개의 볼지지부(130A, 130B) 각각에는 복수개의 볼(133)이 회전 가능하게 장착되는 복수개의 볼장착홀(134)이 형성될 수 있다. 복수개의 볼장착홀(134)은 축방향으로 서로 이격되어 배치될 수 있다.A plurality of ball mounting holes 134 to which a plurality of balls 133 are rotatably mounted may be formed in each of the plurality of ball support portions 130A and 130B. The plurality of ball mounting holes 134 may be disposed to be spaced apart from each other in the axial direction.
복수개의 볼(133)은 복수개의 볼장착홀(134)에 각각 장착되어, 반경방향의 외측면이 요크 튜브(110)의 제1 그루브(111)의 내측면에 접촉될 수 있고, 반경방향의 내측면은 요크 샤프트(110)의 제2 그루브(121)의 내측면에 접촉될 수 있다.The plurality of balls 133 are mounted in each of the plurality of ball mounting holes 134, so that the outer surface in the radial direction may contact the inner surface of the first groove 111 of the yoke tube 110, and The inner surface may contact the inner surface of the second groove 121 of the yoke shaft 110.
복수개의 볼지지부(130A, 130B)는 종단면이 원형인 기둥형상으로 형성될 수 있다. 따라서, 복수개의 볼장착홀(134)에 각각 장착된 복수개의 볼(133)을 복수개의 볼장착홀(134)이 강하게 움켜쥐게 되므로, 복수개의 볼(133)이 복수개의 볼장착홀(134)에 안정적으로 장착된 상태를 유지할 수 있다.The plurality of ball support portions 130A and 130B may be formed in a column shape having a circular longitudinal section. Therefore, since the plurality of ball mounting holes 134 strongly grasp the plurality of balls 133 respectively mounted in the plurality of ball mounting holes 134, the plurality of balls 133 are formed in the plurality of ball mounting holes 134 It can maintain a stable mounted state.
다만, 복수개의 볼장착홀(134)이 복수개의 볼(133)을 강하게 움켜쥐게 하기 위해, 반드시 복수개의 볼지지부(130A, 130B)의 종단면이 원형으로 형성되는 것에 한정되는 것은 아니고, 복수개의 볼지지부(130A, 130B)의 종단면은 타원형으로 형성될 수도 있다.However, in order for the plurality of ball mounting holes 134 to hold the plurality of balls 133 strongly, the longitudinal section of the plurality of ball support portions 130A and 130B is not necessarily limited to being formed in a circular shape, The longitudinal sections of the branches 130A and 130B may be formed in an elliptical shape.
복수개의 제1 그루브(111) 및 복수개의 제2 그루브(121)는 원호형상으로 형성될 수 있다. 따라서, 서로 대향하는 제1 그루브(111) 및 제2 그루브(121)는 원형의 포켓형상을 이루기 때문에, 종단면이 원형인 복수개의 볼지지부(130A, 130B)가 제1 그루브(111) 및 제2 그루비(121)에 매칭되게 삽입 배치될 수 있다.The plurality of first grooves 111 and the plurality of second grooves 121 may be formed in an arc shape. Therefore, since the first groove 111 and the second groove 121 facing each other form a circular pocket shape, a plurality of ball support portions 130A and 130B having a circular longitudinal section are formed with the first groove 111 and the second groove. It may be inserted and arranged to match the groovy 121.
도 2를 참조하면, 요크 튜브(111)의 일단부는 요크 튜브(111)의 타단부에 비해 외경이 작게 형성될 수 있다. 따라서, 요크 튜브(111)의 무게를 줄일 수 있고, 나아가서는 인터미디어트 샤프트(110)의 무게를 줄일 수 있다. 다만, 요크 튜브(111)의 일단부의 외경을 요크 튜브(111)의 타단부 외경보다 작게 형성하게 되면, 요크 튜브(111)의 일단부의 강성이 약해질 우려가 있으므로, 이를 방지하기 위해 요크 튜브(110)의 일단부 외주면에는 복수개의 보강리브(115)가 돌출 형성될 수 있다. 복수개의 보강리브(115)는 원주방향을 따라 서로 이격되어 배치될 수 있다. 복수개의 보강리브(115)는 축방향으로 길게 형성될 수 있다.Referring to FIG. 2, one end of the yoke tube 111 may have an outer diameter smaller than that of the other end of the yoke tube 111. Accordingly, the weight of the yoke tube 111 can be reduced, and further, the weight of the intermediate shaft 110 can be reduced. However, if the outer diameter of one end of the yoke tube 111 is formed smaller than the outer diameter of the other end of the yoke tube 111, the rigidity of the one end of the yoke tube 111 may be weakened. A plurality of reinforcing ribs 115 may protrude on the outer circumferential surface of one end of 110). The plurality of reinforcing ribs 115 may be disposed to be spaced apart from each other along the circumferential direction. The plurality of reinforcing ribs 115 may be formed to be elongated in the axial direction.
특히, 복수개의 보강리브(115)는 복수개의 제1 그루브(111)에 각각 대응되는 부분에 형성되어서, 복수개의 제1 그루브(111)의 형상이 인터미디어트 샤프트(100)에 작용하는 하중에 의해 쉽게 변하지 않도록 할 수 있다.In particular, a plurality of reinforcing ribs 115 are formed in portions corresponding to each of the plurality of first grooves 111, so that the shape of the plurality of first grooves 111 is applied to the load acting on the intermediate shaft 100. It can be prevented from changing easily.
도 4를 참조하면, 복수개의 볼지지부(130A, 130B) 중, 어느 하나(130A)에 형성된 복수개의 볼장착홀(134)의 간격과, 다른 하나(130B)에 형성된 복수개의 볼장착홀(134)의 간격은, 서로 다르게 형성될 수 있다. 즉, 볼지지부(130A)에 구비된 복수개의 볼(133)의 축방향 위치와, 볼지지부(130B)에 구비된 복수개의 볼(133)의 축방향 위치가 다르게 배치될 수 있다. 이를 통해, 요크 튜브(110) 및 요크 샤프트(120)에 작용하는 하중을 쉽게 분산시킬 수 있으며, 차량의 사양에 따라서 요크 튜브(110) 및 요크 샤프트(120)에 작용하는 하중의 위치가 다를 수 있는데, 복수개의 볼(133)의 축방향 위치를 쉽게 설정하여 요크 튜브(110) 및 요크 샤프트(120)에 작용하는 하중을 차량의 사양에 적합하게 분산시킬 수 있게 된다.4, among a plurality of ball support portions 130A and 130B, a distance between a plurality of ball mounting holes 134 formed in one 130A and a plurality of ball mounting holes 134 formed in the other 130B ) May be formed differently from each other. That is, the axial positions of the plurality of balls 133 provided on the ball support part 130A and the axial positions of the plurality of balls 133 provided on the ball support part 130B may be differently disposed. Through this, the load acting on the yoke tube 110 and the yoke shaft 120 can be easily distributed, and the position of the load acting on the yoke tube 110 and the yoke shaft 120 may be different depending on the specifications of the vehicle. However, by easily setting the axial positions of the plurality of balls 133, the load acting on the yoke tube 110 and the yoke shaft 120 can be distributed appropriately to the specifications of the vehicle.
복수개의 볼지지부(130A, 130B) 각각에는 복수개의 볼장착홀(134) 사이에 탄성가압부(135)가 형성될 수 있다. 탄성가압부(135)는 절개홈(136)을 가질 수 있다. 절개홈(136)은 탄성가압부(135)의 축방향 중간지점에 원주방향으로 길이를 가지도록 형성될 수 있다. 절개홈(136)의 축방향 양측면은 절개홈(136)의 입구로 갈수록 벌어지게 경사져서 형성될 수 있다. 탄성가압부(135)는 절개홈(136)에 의해 축방향으로 작용하는 탄성력을 가질 수 있으며, 복수개의 볼(133)은 탄성가압부(135)의 탄성력에 의해, 복수개의 볼장착홀(134)에 탄력적으로 삽입될 수 있고, 복수개의 볼장착홀(134)에 삽입된 후에는 복수개의 볼장착홀(134)에 회전 가능하게 장착된 상태를 유지할 수 있다.An elastic pressing part 135 may be formed between the plurality of ball mounting holes 134 in each of the plurality of ball support parts 130A and 130B. The elastic pressing part 135 may have an incision groove 136. The cut groove 136 may be formed to have a length in the circumferential direction at an intermediate point in the axial direction of the elastic pressing part 135. Both sides in the axial direction of the cut groove 136 may be formed to be inclined to widen toward the entrance of the cut groove 136. The elastic pressing unit 135 may have an elastic force acting in the axial direction by the cut groove 136, and the plurality of balls 133 may be provided with a plurality of ball mounting holes 134 by the elastic force of the elastic pressing unit 135. ) May be elastically inserted, and after being inserted into the plurality of ball mounting holes 134, the state of being rotatably mounted in the plurality of ball mounting holes 134 may be maintained.
탄성가압부(135)의 축방향 폭은 반경방향 외측으로 갈수록 좁아지게 형성될 수 있다. 볼장착홀(134)은 복수개의 탄성가압부(135) 사이에 구비되므로, 볼장착홀(134)의 축방향 양측은 탄성가압부(135)의 축방향 양측의 형상에 대응하는 형상으로 형성된다. 탄성가압부(135)의 축방향 폭이 반경방향 외측으로 갈수록 좁아지게 형성되므로, 볼장착홀(134)의 축방향 폭은 반경방향 외측으로 갈수록 넓어지게 형성되며, 이를 통해 볼장착홀(134)에 볼(133)을 쉽게 삽입할 수 있고, 볼장착홀(134)에 볼(133)이 삽입된 후에는 볼(133)이 볼장착홀(134)의 축방향 양측에 의해 가압되므로, 볼(133)은 볼장착홀(134)에 회전 가능하게 장착된 상태를 유지할 수 있다.The width in the axial direction of the elastic pressing part 135 may be formed to become narrower toward the outer side in the radial direction. Since the ball mounting hole 134 is provided between the plurality of elastic pressing parts 135, both sides of the ball mounting hole 134 in the axial direction are formed in a shape corresponding to the shape of both sides of the elastic pressing part 135 in the axial direction. . Since the axial width of the elastic pressing part 135 is formed to become narrower toward the outer side in the radial direction, the axial width of the ball mounting hole 134 is formed to become wider toward the outer side in the radial direction, through which the ball mounting hole 134 The ball 133 can be easily inserted into the ball, and after the ball 133 is inserted into the ball mounting hole 134, the ball 133 is pressed by both sides of the ball mounting hole 134 in the axial direction, so that the ball ( 133 may maintain a state rotatably mounted in the ball mounting hole 134.
도 6을 참조하면, 복수개의 제1 그루브(111)의 반경방향의 입구 양측과, 상기 복수개의 제2 그루브(121)의 반경방향의 입구 양측은, 복수개의 볼(133)과 이격될 수 있다. 따라서, 복수개의 볼(133)이 제1 그루브(111) 및 제2 그루브(121)에 삽입된 상태일 때, 복수개의 볼(133)은 원활하게 회전될 수 있다.Referring to FIG. 6, both sides of the inlet in the radial direction of the plurality of first grooves 111 and both sides of the inlet in the radial direction of the plurality of second grooves 121 may be spaced apart from the plurality of balls 133. . Accordingly, when the plurality of balls 133 are inserted into the first groove 111 and the second groove 121, the plurality of balls 133 can be smoothly rotated.
구체적으로, 복수개의 제1 그루브(111)의 반경방향의 입구 양측과, 복수개의 제2 그루브(121)의 반경방향의 입구 양측은, 볼록한 곡면(R1, R2, R3, R4)으로 형성될 수 있다.Specifically, both sides of the inlet in the radial direction of the plurality of first grooves 111 and both sides of the inlet in the radial direction of the plurality of second grooves 121 may be formed as convex curved surfaces R1, R2, R3, R4. have.
곡면(R1, R2, R3, R4)은, 복수개의 제1 그루브(111)의 반경방향의 입구 일측에 형성된 제1 곡면(R1)과, 복수개의 제1 그루브(111)의 반경방향의 입구 타측에 형성된 제2 곡면(R2)과, 복수개의 제2 그루브(121)의 반경방향의 입구 일측에 형성된 제3 곡면(R3)과, 복수개의 제2 그루브(121)의 반경방향의 입구 타측에 형성된 제4 곡면(R4)을 포함할 수 있다. 제1 곡면(R1) 및 제3 곡면(R3)는 반경방향으로 대향될 수 있고, 제2 곡면(R2) 및 제4 곡면(R4)은 반경방향으로 대향될 수 있다.The curved surfaces R1, R2, R3, R4 are a first curved surface R1 formed on one side of the entrance in the radial direction of the plurality of first grooves 111, and the other side of the entrance in the radial direction of the plurality of first grooves 111 The second curved surface R2 formed in the, a third curved surface R3 formed on one side of the inlet in the radial direction of the plurality of second grooves 121, and the third curved surface R3 formed in the other side of the inlet in the radial direction of the plurality of second grooves 121 It may include a fourth curved surface R4. The first curved surface R1 and the third curved surface R3 may be opposed in the radial direction, and the second curved surface R2 and the fourth curved surface R4 may be opposed in the radial direction.
복수개의 제1 그루브(111)의 반경방향의 입구 양측과, 상기 복수개의 제2 그루브(121)의 반경방향의 입구 양측을, 복수개의 볼(133)과 이격시키기 위해, 반드시 복수개의 제1 그루브(111)의 반경방향의 입구 양측과, 복수개의 제2 그루브(121)의 반경방향의 입구 양측은, 볼록한 곡면(R1, R2, R3, R4)으로 형성될 필요는 없다. 즉, 복수개의 제1 그루브(111)의 반경방향의 입구 양측과, 복수개의 제2 그루브(121)의 반경방향의 입구 양측은, 상기 반경방향의 입구로 갈수록 벌어지는 경사면으로 형성될 수도 있다.In order to separate both radial entrance sides of the plurality of first grooves 111 and the radial entrance both sides of the plurality of second grooves 121 from the plurality of balls 133, a plurality of first grooves must be Both sides of the inlet in the radial direction of 111 and both sides of the inlet in the radial direction of the plurality of second grooves 121 need not be formed with convex curved surfaces R1, R2, R3, and R4. That is, both sides of the inlet in the radial direction of the plurality of first grooves 111 and both sides of the inlet in the radial direction of the plurality of second grooves 121 may be formed as inclined surfaces that expand toward the inlet in the radial direction.
한편, 도 2, 도 3 및 도 7을 참조하면, 요크 튜브(110)의 일단부 외주에는 더스트 캡(140)이 씌워질 수 있다. 더스트 캡(140)에는 요크 샤프트(120)가 축방향으로 관통할 수 있다. 더스트 캡(140)의 축방향 일면에는 요크 샤프트(120)가 축방향으로 관통홀이 형성될 수 있다.Meanwhile, referring to FIGS. 2, 3 and 7, a dust cap 140 may be covered on the outer periphery of one end of the yoke tube 110. The yoke shaft 120 may pass through the dust cap 140 in the axial direction. A through hole may be formed on one surface of the dust cap 140 in the axial direction of the yoke shaft 120 in the axial direction.
더스트 캡(140)의 내주면에는 걸림돌기(141)가 형성될 수 있다. 걸림돌기(141)는 더스트 캡(140)의 내주면에 원주방향으로 연속되게 형성되어 링형으로 형성될 수 있다. 그리고, 요크 튜브(110)의 일단부 외주면에는 걸림돌기(141)가 삽입되어 걸림되는 걸림홈(113)이 형성될 수 있다. 걸림홈(113)은 걸림돌기(141)와 대응하는 형상으로 형성될 수 있다. 걸림홈(113)은 요크 튜브(110)의 일단부 외주면에 원주방향으로 연속되게 형성되어 링형으로 형성될 수 있다. 걸림돌기(141)가 걸림홈(113)에 삽입됨으로써, 더스트 캡(140)은 요크 튜브(110)의 일단부 외주면에 씌워진 상태를 유지할 수 있다.A locking protrusion 141 may be formed on the inner circumferential surface of the dust cap 140. The locking protrusion 141 may be formed continuously in the circumferential direction on the inner circumferential surface of the dust cap 140 to be formed in a ring shape. In addition, a locking protrusion 141 is inserted into an outer circumferential surface of one end of the yoke tube 110 to form a locking groove 113 to be locked. The locking groove 113 may be formed in a shape corresponding to the locking protrusion 141. The locking groove 113 may be formed continuously in a circumferential direction on an outer circumferential surface of one end of the yoke tube 110 to be formed in a ring shape. As the locking protrusion 141 is inserted into the locking groove 113, the dust cap 140 may maintain a state covered on the outer peripheral surface of one end of the yoke tube 110.
더스트 캡(140)은 인터미디어트 샤프트(100)의 외부로부터 이물질이 요크 큐브(110)의 일단부 및 요크 샤프트(120)의 일단부 사이의 간극을 통해 인터미디어트 샤프트(100)의 내부로 유입되는 것을 방지하는 기능을 할 수 있다.The dust cap 140 allows foreign matter from the outside of the intermediate shaft 100 to the inside of the intermediate shaft 100 through a gap between one end of the yoke cube 110 and one end of the yoke shaft 120. It can function to prevent inflow.
하지만, 더스트 캡(140)이 요크 튜브(110)의 일단부 및 요크 샤프트(120)의 일단부 사이의 간극을 차단하게 되면, 요크 튜브(110) 또는 요크 샤프트(120)가 축방향으로 이동될 때 요크 튜브(110) 내부의 공기압에 의해 요크 샤프트(120)가 요크 튜브(110) 내로 원활하게 삽입되지 않을 수 있다. 따라서, 더스트 캡(140)에는 요크 튜브(110)의 내부공간과 통하는 공기유동홀(145)이 형성되어서, 요크 튜브(110) 또는 요크 샤프트(120)가 축방향으로 이동될 때 요크 튜브(110) 내부의 공기가 공기유동홀(145)을 통해 출입함으로써, 인터미디어트 샤프트(100)의 축방향으로 길이변화가 원활하게 이루어질 수 있다.However, when the dust cap 140 blocks the gap between one end of the yoke tube 110 and one end of the yoke shaft 120, the yoke tube 110 or the yoke shaft 120 may be moved in the axial direction. At this time, the yoke shaft 120 may not be smoothly inserted into the yoke tube 110 due to the air pressure inside the yoke tube 110. Therefore, the dust cap 140 is formed with an air flow hole 145 communicating with the inner space of the yoke tube 110, so that when the yoke tube 110 or the yoke shaft 120 is moved in the axial direction, the yoke tube 110 ) As the internal air enters and exits through the air flow hole 145, the length change in the axial direction of the intermediate shaft 100 can be made smoothly.
공기유동홀(145)은 외부로 이물질을 최대한 차단함과 아울러 요크 튜브(110) 내로 공기가 출입할 수 있는 사이즈 및 형상을 가질 수 있다. 이를 위해, 본 실시예에서 공기유동홀(145)은 더스트 캡(140)의 축방향 일면에 복수개로 형성되고, 원호형으로 형성된다. 본 실시예에서 공기유동홀(145)의 개수는 원주방향으로 서로 이격되어 3개로 구비되나, 공기유동홀(145)의 개수는 적어도 하나로 형성될 수 있다.The air flow hole 145 may have a size and shape to block foreign substances to the outside as much as possible and allow air to enter and exit into the yoke tube 110. To this end, in this embodiment, a plurality of air flow holes 145 are formed on one surface of the dust cap 140 in the axial direction, and are formed in an arc shape. In the present embodiment, the number of air flow holes 145 is spaced apart from each other in the circumferential direction and is provided in three, but the number of air flow holes 145 may be at least one.
상기와 같이, 본 발명의 실시예에 의한 차량 조향시스템의 인터미디어트 샤프트(100)는, 요크 튜브(110) 및 요크 샤프트(120) 사이에 구비된 슬리브 부재(130)의 볼지지부(130A, 130B)는 종단면이 원형인 기둥형상으로 형성되어 있기 때문에, 상기 볼지지부(130A, 130B)에 형성된 복수개의 볼장착홀(134)에 각각 장착된 복수개의 볼(133)을 상기 복수개의 볼장착홀(134)이 강하게 움켜쥐게 되므로, 상기 복수개의 볼(133)이 상기 복수개의 볼장착홀(134)에 안정적으로 장착된 상태를 유지할 수 있다.As described above, the intermediate shaft 100 of the vehicle steering system according to the embodiment of the present invention includes the ball support 130A of the sleeve member 130 provided between the yoke tube 110 and the yoke shaft 120, Since 130B) is formed in a columnar shape with a circular longitudinal section, a plurality of balls 133 each mounted in a plurality of ball mounting holes 134 formed in the ball support portions 130A and 130B are inserted into the plurality of ball mounting holes. Since 134 is strongly gripped, the plurality of balls 133 can be stably mounted in the plurality of ball mounting holes 134 to be maintained.
또한, 본 발명의 실시예에 의한 차량 조향시스템의 인터미디어트 샤프트(100)는, 요크 튜브(110)의 일단부 외경이 요크 튜브(110)의 타단부 외경보다 작게 형성되어 있고, 요크 튜브(110)의 일단부 외주면에는 요크 튜브(110)의 일단부 내주면에 축방향으로 연장되어 형성된 제1 그루브(111)와 대응하는 복수개의 보강리브(115)가 형성되어 있기 때문에, 가벼우면서도 강성을 유지할 수 있다.In addition, in the intermediate shaft 100 of the vehicle steering system according to the embodiment of the present invention, the outer diameter of one end of the yoke tube 110 is formed smaller than the outer diameter of the other end of the yoke tube 110, and the yoke tube ( Since the outer circumferential surface of one end of the yoke tube 110 is formed with a plurality of reinforcing ribs 115 corresponding to the first groove 111 formed extending in the axial direction to the inner circumferential surface of the one end of the yoke tube 110, it is light and maintains rigidity. I can.
또한, 본 발명의 실시예에 의한 차량 조향시스템의 인터미디어트 샤프트(100)는, 슬리브 부재(130)에 형성된 복수개의 볼지지부(130A, 130B) 중, 어느 하나(130A)에 형성된 볼장착홀(134)의 간격과, 다른 하나(130B)에 형성된 볼장착홀(134)의 간격이 상이하므로, 요크 튜브(110) 및 요크 샤프트(120)에 작용하는 하중을 쉽게 분산시킬 수 있다.In addition, the intermediate shaft 100 of the vehicle steering system according to the embodiment of the present invention is a ball mounting hole formed in any one of the plurality of ball support portions 130A, 130B formed in the sleeve member 130 Since the spacing of 134 and the spacing of the ball mounting hole 134 formed in the other 130B are different, the load acting on the yoke tube 110 and the yoke shaft 120 can be easily distributed.
본 발명이 속하는 기술분야의 통상의 지식을 가진 자는 본 발명이 그 기술적 사상이나 필수적인 특징을 변경하지 않고서 다른 구체적인 형태로 실시될 수 있다는 것을 이해할 수 있을 것이다. 그러므로 이상에서 기술한 실시예는 모든 면에서 예시적인 것이며 한정적이 아닌 것으로 이해해야만 한다. 본 발명의 범위는 상기 상세한 설명보다는 후술하는 청구범위에 의하여 나타내어지며, 청구범위의 의미 및 범위 그리고 그 균등 개념으로부터 도출되는 모든 변경 또는 변형된 형태가 본 발명의 범위에 포함되는 것으로 해석되어야 한다.Those of ordinary skill in the art to which the present invention pertains will appreciate that the present invention can be implemented in other specific forms without changing the technical spirit or essential features thereof. Therefore, it should be understood that the embodiments described above are illustrative in all respects and are not limiting. The scope of the present invention is indicated by the claims to be described later rather than the detailed description, and all changes or modified forms derived from the meaning and scope of the claims and their equivalent concepts should be construed as being included in the scope of the present invention.
본 발명은 복수개의 볼이 슬리브 부재의 볼지지부에 형성된 복수개의 볼장착홀에 안정적으로 장착된 상태를 유지할 수 있는 차량 조향시스템의 인터미디어트 샤프트를 제공한다.The present invention provides an intermediate shaft of a vehicle steering system capable of maintaining a state in which a plurality of balls are stably mounted in a plurality of ball mounting holes formed in a ball support portion of a sleeve member.

Claims (12)

  1. 일단부 내주면에 축방향으로 연장되는 복수개의 제1 그루브가 원주방향을 따라 서로 이격되어 형성된 요크 튜브;A yoke tube in which a plurality of first grooves extending in the axial direction are spaced apart from each other along the circumferential direction on the inner circumferential surface of one end;
    상기 요크 튜브의 일단부 내로 삽입되는 일단부 외주면에 상기 복수개의 제1 그루브와 각각 대향되는 복수개의 제2 그루브가 축방향으로 연장되고 원주방향을 따라 서로 이격되어 형성된 요크 샤프트;A yoke shaft formed by extending the plurality of first grooves and a plurality of second grooves respectively opposed to each other in the axial direction and spaced apart from each other along the circumferential direction on an outer circumferential surface of one end inserted into the one end of the yoke tube;
    상기 복수개의 제1 그루브 및 상기 복수개의 제2 그루브에 삽입되는 복수개의 볼; 및A plurality of balls inserted into the plurality of first grooves and the plurality of second grooves; And
    상기 요크 튜브 및 상기 요크 샤프트 사이에 배치되어, 상기 복수개의 볼을 회전 가능하게 지지하는 슬리브 부재;를 포함하고,It is disposed between the yoke tube and the yoke shaft, a sleeve member rotatably supporting the plurality of balls; Including,
    상기 슬리브 부재에는 상기 복수개의 제1 그루브 및 상기 복수개의 제2 그루브에 삽입되어 상기 복수개의 볼을 회전 가능하게 지지하고 원주방향으로 서로 이격되어 배치되는 복수개의 볼지지부가 형성되고,The sleeve member has a plurality of ball support portions inserted into the plurality of first grooves and the plurality of second grooves to rotatably support the plurality of balls and spaced apart from each other in a circumferential direction,
    상기 복수개의 볼지지부 각각에는 상기 복수개의 볼이 회전 가능하게 장착되는 복수개의 볼장착홀이 축방향으로 서로 이격되어 형성되며,In each of the plurality of ball support portions, a plurality of ball mounting holes through which the plurality of balls are rotatably mounted are formed to be spaced apart from each other in the axial direction,
    상기 복수개의 볼지지부는 종단면이 원형인 기둥형상으로 형성되는 차량 조향시스템의 인터미디어트 샤프트.The intermediate shaft of the vehicle steering system wherein the plurality of ball support portions are formed in a column shape having a circular longitudinal section.
  2. 청구항 1에 있어서,The method according to claim 1,
    상기 복수개의 볼지지부는 종단면이 타원형으로 형성되는 차량 조향시스템의 인터미디어트 샤프트.The intermediate shaft of the vehicle steering system in which the plurality of ball support portions are formed in an elliptical longitudinal section.
  3. 청구항 1에 있어서,The method according to claim 1,
    상기 복수개의 제1 그루브 및 상기 복수개의 제2 그루브는 원호형상으로 형성되는 차량 조향시스템의 인터미디어트 샤프트.The intermediate shaft of the vehicle steering system wherein the plurality of first grooves and the plurality of second grooves are formed in an arc shape.
  4. 청구항 1에 있어서,The method according to claim 1,
    상기 요크 튜브의 일단부는 상기 요크 튜브의 타단부에 비해 외경이 작게 형성되고,One end of the yoke tube has an outer diameter smaller than that of the other end of the yoke tube,
    상기 요크 튜브의 일단부 외주면에는 상기 복수개의 제1 그루브에 각각 대응하는 부분에 축방향으로 연장되는 복수개의 보강리브가 원주방향을 따라 서로 이격되어 돌출 형성되는 차량 조향시스템의 인터미디어트 샤프트.An intermediate shaft of a vehicle steering system in which a plurality of reinforcing ribs extending axially in portions corresponding to each of the plurality of first grooves are formed to protrude from each other along a circumferential direction on an outer peripheral surface of one end of the yoke tube.
  5. 청구항 1에 있어서,The method according to claim 1,
    상기 복수개의 볼지지부 중, 어느 하나에 형성된 상기 복수개의 볼장착홀의 간격과, 다른 하나에 형성된 상기 복수개의 볼장착홀의 간격은, 서로 다르게 형성되는 차량 조향시스템의 인터미디어트 샤프트.An intermediate shaft of a vehicle steering system in which a spacing of the plurality of ball mounting holes formed in one of the plurality of ball support portions and a spacing of the plurality of ball mounting holes formed in the other of the plurality of ball support portions is formed differently from each other.
  6. 청구항 1에 있어서,The method according to claim 1,
    상기 복수개의 볼지지부 각각에는 상기 복수개의 볼장착홀 사이에 절개홈을 가지는 탄성가압부가 형성되고,Each of the plurality of ball support portions is formed with an elastic pressing portion having an incision groove between the plurality of ball mounting holes,
    상기 복수개의 볼은 상기 탄성가압부의 탄성력에 의해 상기 복수개의 볼장착홀에 탄력적으로 삽입되는 차량 조향시스템의 인터미디어트 샤프트.The plurality of balls are intermediate shafts of a vehicle steering system that are elastically inserted into the plurality of ball mounting holes by an elastic force of the elastic pressing unit.
  7. 청구항 6에 있어서,The method of claim 6,
    상기 복수개의 제1 그루브의 반경방향의 입구 양측과, 상기 복수개의 제2 그루브의 반경방향의 입구 양측은, 상기 복수개의 볼과 이격되는 차량 조향시스템의 인터미디어트 샤프트.The intermediate shaft of the vehicle steering system is spaced apart from the plurality of balls at both sides of the radial entrance of the plurality of first grooves and both sides of the radial entrance of the plurality of second grooves.
  8. 청구항 7에 있어서,The method of claim 7,
    상기 복수개의 제1 그루브의 반경방향의 입구 양측과, 상기 복수개의 제2 그루브의 반경방향의 입구 양측은, 볼록한 곡면으로 형성되는 차량 조향시스템의 인터미디어트 샤프트.An intermediate shaft of a vehicle steering system wherein both radial entrance sides of the plurality of first grooves and both radial entrance sides of the plurality of second grooves are formed with a convex curved surface.
  9. 청구항 7에 있어서,The method of claim 7,
    상기 복수개의 제1 그루브의 반경방향의 입구 양측과, 상기 복수개의 제2 그루브의 반경방향의 입구 양측은, 상기 반경방향의 입구로 갈수록 벌어지는 경사면으로 형성되는 차량 조향시스템의 인터미디어트 샤프트.An intermediate shaft of a vehicle steering system, wherein both sides of the radial entrances of the plurality of first grooves and both sides of the radial entrances of the plurality of second grooves are formed as inclined surfaces extending toward the radial entrances.
  10. 청구항 7에 있어서,The method of claim 7,
    상기 탄성가압부의 축방향 폭은 반경방향 외측으로 갈수록 좁아지게 형성되는 차량 조향시스템의 인터미디어트 샤프트.The intermediate shaft of the vehicle steering system is formed such that the axial width of the elastic pressing part becomes narrower toward the outer side in the radial direction.
  11. 청구항 1에 있어서,The method according to claim 1,
    상기 요크 튜브의 일단부 외주에 씌워지고, 상기 요크 샤프트가 관통하는 더스트 캡;을 더 포함하고,A dust cap covered on the outer periphery of one end portion of the yoke tube and passing through the yoke shaft; further comprising,
    상기 더스트 캡에는 상기 요크 튜브의 내부공간과 통하는 공기유동홀이 형성되는 차량 조향시스템의 인터미디어트 샤프트.An intermediate shaft of a vehicle steering system in which an air flow hole communicating with the inner space of the yoke tube is formed in the dust cap.
  12. 청구항 11에 있어서,The method of claim 11,
    상기 공기유동홀은 상기 더스트 캡의 축방향 일면에 복수개의 원호형으로 형성되는 차량 조향시스템의 인터미디어트 샤프트.The air flow hole is an intermediate shaft of a vehicle steering system formed in a plurality of arcs on one surface in the axial direction of the dust cap.
PCT/KR2020/012941 2019-09-28 2020-09-24 Intermediate shaft of vehicle steering system WO2021060863A1 (en)

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KR1020190120205A KR20210037819A (en) 2019-09-28 2019-09-28 Steering shaft for steering system for Vehicles
KR10-2019-0120205 2019-09-28

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Citations (5)

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JP2007255639A (en) * 2006-03-24 2007-10-04 Nsk Ltd Telescopic shaft and steering device using the same
KR20110032160A (en) * 2009-09-22 2011-03-30 주식회사 코우 Slidable shafts type power transmission device and its designing method
KR20170020968A (en) * 2015-08-17 2017-02-27 주식회사 만도 Intermediate Shaft of Steering Apparatus for Vehicle
KR20170130981A (en) * 2016-05-20 2017-11-29 남양공업주식회사 interm shaft for steering device of vehicle
US20190078610A1 (en) * 2013-05-21 2019-03-14 Steering Solutions Ip Holding Corporation Method of assembling a rolling element intermediate shaft assembly

Family Cites Families (1)

* Cited by examiner, † Cited by third party
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JP2006283810A (en) 2005-03-31 2006-10-19 Tokai Rubber Ind Ltd Elastic shaft coupling

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007255639A (en) * 2006-03-24 2007-10-04 Nsk Ltd Telescopic shaft and steering device using the same
KR20110032160A (en) * 2009-09-22 2011-03-30 주식회사 코우 Slidable shafts type power transmission device and its designing method
US20190078610A1 (en) * 2013-05-21 2019-03-14 Steering Solutions Ip Holding Corporation Method of assembling a rolling element intermediate shaft assembly
KR20170020968A (en) * 2015-08-17 2017-02-27 주식회사 만도 Intermediate Shaft of Steering Apparatus for Vehicle
KR20170130981A (en) * 2016-05-20 2017-11-29 남양공업주식회사 interm shaft for steering device of vehicle

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