WO2012008663A1 - Combination structure of lead screw for motor-operated seat track and assembly method therefor - Google Patents

Combination structure of lead screw for motor-operated seat track and assembly method therefor Download PDF

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Publication number
WO2012008663A1
WO2012008663A1 PCT/KR2010/008880 KR2010008880W WO2012008663A1 WO 2012008663 A1 WO2012008663 A1 WO 2012008663A1 KR 2010008880 W KR2010008880 W KR 2010008880W WO 2012008663 A1 WO2012008663 A1 WO 2012008663A1
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WO
WIPO (PCT)
Prior art keywords
lead screw
screw
fitted
fixing block
lower rail
Prior art date
Application number
PCT/KR2010/008880
Other languages
French (fr)
Inventor
Young Jong Kim
Original Assignee
Km&I. Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Km&I. Co., Ltd. filed Critical Km&I. Co., Ltd.
Publication of WO2012008663A1 publication Critical patent/WO2012008663A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/02—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable
    • B60N2/04—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable
    • B60N2/06—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable slidable
    • B60N2/067—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable slidable by linear actuators, e.g. linear screw mechanisms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/02—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable
    • B60N2/0224—Non-manual adjustments, e.g. with electrical operation
    • B60N2/02246—Electric motors therefor
    • B60N2/02253—Electric motors therefor characterised by the transmission between the electric motor and the seat or seat parts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/02—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable
    • B60N2/04—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable
    • B60N2/06—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable slidable
    • B60N2/07—Slide construction
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/68—Seat frames
    • B60N2/682—Joining means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
    • B60Y2304/00—Optimising design; Manufacturing; Testing
    • B60Y2304/05—Reducing production costs, e.g. by redesign
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
    • B60Y2304/00—Optimising design; Manufacturing; Testing
    • B60Y2304/07—Facilitating assembling or mounting

Definitions

  • the present invention relates to a combination structure of a lead screw for a motor-operated seat track and an assembly method therefor, and more particularly, to a combination structure of a lead screw and an assembly method therefor in which the configuration thereof is simplified, the assembly thereof is easy and the assembly is firm when the lead screw is coupled to a lower rail.
  • the seat of a vehicle is for maintaining the seated posture of a passenger to be an optimized state, and is constructed to include a seat back configured to support the passenger’s upper body and a seat cushion configured to support the passenger’s lower body, such as buttocks, thighs and the like.
  • the seat of the vehicle is mounted to be slidably movable in the forward-backward direction of the vehicle’s body over a predetermined range, which is enabled by a seat track.
  • the seat track is configured to include a lower rail mounted to be fixed to a floor panel in the longitudinal direction of the vehicle body and an upper rail coupled to be slidably movable along the lower rail and coupled to the seat cushion.
  • Methods for sliding an upper rail are classified into a manual method for manually manipulating it and a motor-operated method for driving it using a motor.
  • the motor-operated method power is supplied from a battery to the motor through the switch manipulation of a user, so that the upper rail slides along the lower rail in a frontward or backward direction through the driving of the motor, thereby enabling the seat of the vehicle to move in the forward-backward direction of the vehicle’s body over a predetermined range. Due to this, it is possible to efficiently utilize the interior space and for a person seated on the seat to feel comfortable ride. Furthermore, the motor-operated method makes it possible to conveniently manipulate a seat in the forward-backward direction and allows fine control, compared to the manual method.
  • the motor-operated seat track conventionally is configured to include a lower rail 100 mounted to be fixed to a floor panel of a vehicle in the longitudinal direction of the vehicle’s body, an upper rail 200 coupled to be slidably movable along the lower rail 100 and coupled to a seat cushion, a motor driving unit 300 configured to slide the upper rail 200, and a gearbox 400 configured to move forward or backward along a lead screw 110 mounted in the lower rail 100 by the driving of the motor driving unit 300 to slide the upper rail 200.
  • the lead screw 110 is mounted in the lower rail 100 by fitting and coupling it’s both ends to first and second fixing blocks 120 and 130 and then coupling the lower surfaces of the first and second fixing blocks 120 and 130 to the upper surface of the lower rail 100.
  • a conventional lead screw combination structure includes separately a structure configured to fix the lead screw 110 to the first and second fixing blocks 120 and 130 and a structure configured to fix the first and second fixing blocks 120 and 130 to the lower rail 100, so that problems occur in which an assembly process is complicated and manufacturing cost become high.
  • An object of the present invention provides a combination structure of a lead screw for a motor-operated seat track and an assembly method therefor in which one end of the lead screw is formed integrally with a fixing block, and the other end functions to fix the lead screw when the fixing block is coupled to an upper rail, thereby simultaneously obtaining the couplings of the lead screw, the fixing block and the lower rail.
  • a combination structure of a lead screw for a motor-operated seat track including a lower rail 100 fixed to and mounted in a lower surface of an inside of a vehicle, an upper rail 200 fixedly mounted at a bottom surface of a seat of a motor vehicle and inserted into the lower rail 100 to be slid in a longitudinal direction of the lower rail 100 and a gearbox 400 inserted into and fixed to the upper rail 200
  • the combination structure includes: a lead screw 110 having a male thread formed on an outer surface thereof so as for the gearbox 400 to be fitted thereto and mounted in a longitudinal direction related to front and rear of the vehicle; a first fixing block 120 having a first coupling hole123 formed on the other surface thereof so as for one end of the lead screw 110 to be fitted thereto and a first screw hole 122 for coupling with the lower rail 100 formed on a lower surface thereof; and a second fixing block 130 having a second coupling hole133 formed on one surface thereof so as for the other end of the lead screw
  • a knurling part 111 may be formed, and the knurling part 111 may be press-fitted and fixed to the first coupling hole 123.
  • the other end of the lead screw 110 may be fitted and coupled to the second coupling hole 133, where the second screw hole 132 is formed under the second coupling hole 133 to be perpendicular to the second coupling hole 133 and is formed to bored through a lower side of the second coupling hole 133 such that a distal end of the second screw T2 is protruded over the second coupling hole 133, and a screw fixing groove 112 is formed on a lower surface of the other end of the lead screw 110 such that the distal end of the second screw T2 is fitted and press-fixed thereto.
  • the combination structure includes a first protruding part 121 formed on a lower surface of one side of the first fixing block 120 to be protruded downward; a first fixing groove 103 formed on the bottom surface 102 of the lower rail 100 so as to the first protruding part 121 to be fitted and coupled thereto; a second protruding part 131 formed on a lower surface of the other side of the second fixing block 130 to be protruded downward; and a second fixing groove 104 formed on the bottom surface 102 of the lower rail 100 so as to the second protruding part 131 to be fitted and coupled thereto.
  • the first protruding part 121 may have an inclined protruding part 121a gradually decreasing in its protruding length toward the other side end.
  • a method for assembling a lead screw includes: a first step S1 in which one end of the lead screw 110 is press-fitted to the first fixing block 120; a second step S2 in which the second fixing block 130 is fitted to the other end of the lower rail 100 from upward to downward; a third step S3 in which the lead screw 110 is fitted to the gearbox 400; a fourth step S4 in which the gearbox 400 to which the lead screw 110 is fitted to the upper rail 200 is assembled; a fifth step S5 in which the upper rail 200 is fitted to the lower rail 100 by sliding thereon and the first fixing block 120 to which the lead screw 110 is press-fitted is fitted to the one end of the lower rail 100 by sliding thereon; a sixth step S6 in which, using the second screw T2, the lower rail 100 and the second fixing block 130 are fixed to each other and, at the same time, the second fixing block 130 and the other end of the lead screw 110 are fixed to each other; and a seventh step S7 in which the lower rail 100 and the first fixing block 120 are fixed
  • the couplings of the lead screw, the fixing block and the lower rail is simultaneously made without lowering of theirs coupling strength, compared to the prior art, so that the productivity is improved due to simplification of an assembly process and the cost of elements is lowered because the number of elements is decreased.
  • FIG. 1 is a basic perspective view showing a motor-operated seat track
  • FIG. 2 is a perspective view showing the combination structure of a lead screw according to the present invention.
  • FIG. 3 is a perspective view showing the combination structure of a lead screw of which a upper rail is eliminated according to the present invention
  • FIG. 4 is an exploded perspective view showing the combination structure of a lead screw of which an upper rail is eliminated according to the present invention
  • FIG. 5 is an exploded perspective view showing the combination structure of a lead screw when viewed from the lower surface according to the present invention
  • FIG. 6 is a cross-sectional view showing the combination structure of a second fixing block according to the present invention.
  • FIG. 7 is an exploded perspective view showing the second step of an assembly method according to the present invention.
  • FIG. 8 is an exploded perspective view showing the third and fourth steps of the assembly method according to the present invention.
  • FIG. 9 is an exploded perspective view showing the fifth step of the assembly method according to the present invention.
  • FIG. 10 is an exploded perspective view showing the sixth and seventh steps of the assembly method according to the present invention.
  • the motor-operated seat track conventionally is configured to include a lower rail 100 mounted to be fixed to a floor panel of a vehicle in the longitudinal direction of the vehicle’s body, an upper rail 200 coupled to be slidably movable along the lower rail 100 and coupled to a seat cushion, a motor driving unit 300 configured to slide the upper rail 200, and a gearbox 400 configured to move forward or backward along a lead screw 110 mounted in the lower rail 100 by the driving of the motor driving unit 300 to slide the upper rail 200.
  • the structure of the motor-operated seat track is configured such that all configurations thereof are formed to have left and right parts symmetrical to each other, so that, in this embodiment, only any one part’s configuration is described in detail
  • the combination structure of the lead screw according to the present invention is configured to include a lower rail 100, a lead screw 110, a first fixing block 120 and a second fixing block 130.
  • the lower rail 100 may be fixed to the lower surface of the inside of a vehicle.
  • the lower rail 100 may be formed in a longitudinal direction related to the front and rear of the vehicle.
  • the lower rail 100 can be formed such that both sides thereof are extended upward with respect to the lower surface 102 thereof and are then bended toward its center when viewed from the cross-sectional surface of the lower rail 100. In the both sides bended toward the lower rail’s center, flanges 101 bended downward may be formed respectively.
  • the lower surface 102 of the lower rail 100 may have a first fixing hole 105 bored therethrough in one end and a second fixing hole 106 bored therethrough in the other end.
  • the lead screw 110 may be mounted along the longitudinal direction in the lower surface 102 of the lower rail 100.
  • the lead screw 110 is made of a cylindrical stick.
  • a male thread may be formed on the outer peripheral surface of the lead screw 110.
  • a knurling part 111 is formed on the outer surface of one end part of the lead screw 110. This is a configuration to be press-fitted and fixed to the first fixing block 120 which is described below upon the description of the first fixing block 120.
  • the knurling part 111 is formed using a conventional knurling method, details of which are omitted.
  • a screw fixing groove 112 may be formed on the lower surface of the other end part of the lead screw 110.
  • the screw fixing groove 112 may be formed to be depressed upward from the lower surface of the lead screw 110.
  • the lower surface of the lead screw 110 is defined to be a surface facing downward when the lead screw 110 is fixed to the first fixing block 120 and the second fixing block 130 and mounted in the lower rail 100.
  • the screw fixing groove 112 is for firming the combination with the second fixing block 130, which is described below when the second fixing block 130 is described.
  • the first fixing block 120 may be hexahedron.
  • a first coupling hole 123 is formed on the other surface of the first fixing block 120.
  • the first coupling hole 123 is formed to be depressed inward from the other surface of the first fixing block 120.
  • the first coupling hole 123 is a configuration to which one end of the lead screw 110 is fitted and fixed, and has the same shape as that of the one end of the lead screw 110.
  • the knurling part 111 is press-fitted and fixed to the first coupling hole 123. Accordingly, the one end of the lead screw 110 and the first fixing block 120 are coupled to each other without a separate fastening member, and firm coupling is possible.
  • a first screw hole 122 is formed on the lower surface of the first fixing block 120.
  • the first screw hole 122 is formed to be depressed upward from the lower surface of the first fixing block 120 and has a female thread formed on the inner surface thereof.
  • the first screw hole 122 is a configuration for the coupling with the lower surface 102 of the lower rail 100, and is contacted against and screw-coupled to the first fixing hole 105 formed on the corresponding portion of the first screw hole 122 of the lower surface 102 through a first screw T1.
  • a first protruding part 121 may be formed on the lower surface of one side of the first fixing block 120.
  • the first protruding part 121 may be formed to be protruded downward.
  • the first protruding part 121 may be fitted and coupled to the first fixing groove 103 formed on the corresponding part of the first protruding part 121 in the lower surface 102 of the lower rail 100.
  • the first protruding part 121 enables the coupling between the first fixing block 120 and the lower rail 100 to be stronger. In particular, it prevents the first screw (T1) fixing part from rotating around the center axis thereof upon screw coupling.
  • the first protruding part 121 may be formed to have a height of 1mm or below. Furthermore, an inclined protruding part 121a gradually decreasing in its protruding length toward the other side end may be formed in the first protruding part 121.
  • the first protruding part 121 is assembled to be slidable on its sides in the longitudinal direction rather than is assembled to the lower rail 100 from upward to downward, so that the height of the first protruding part 121 must not be high, which is described below in a method of assembling the lead screw. If the first protruding part 121 is formed to be high, obstruction may occur upon the assembly of the first fixing block 120. In addition, the first protruding part 121 can be smoothly coupled to the first fixing groove 103 through the inclined protruding part 121a of the first protruding part 121 when fitted and coupled thereto.
  • the first fixing block 120 may be hexahedron.
  • a first coupling hole 123 is formed on the other surface of the first fixing block 120.
  • the first coupling hole 123 is formed to be depressed inward from the other surface of the first fixing block 120.
  • the first coupling hole 123 is a configuration to which one end of the lead screw 110 is fitted and fixed, and has the same shape as that of the one end of the lead screw 110.
  • the knurling part 111 is press-fitted and fixed to the first coupling hole 123. Accordingly, the one end of the lead screw 110 and the first fixing block 120 are coupled to each other without a separate fastening member, and firm coupling is possible.
  • a first screw hole 122 is formed on the lower surface of the first fixing block 120.
  • the first screw hole 122 is formed to be depressed upward from the lower surface of the first fixing block 120 and has a female thread formed on the inner surface thereof.
  • the first screw hole 122 is a configuration for the coupling with the lower surface 102 of the lower rail 100, and is contacted against and screw-coupled to the first fixing hole 105 formed on the corresponding portion of the first screw hole 122 of the lower surface 102 through a first screw T1.
  • a first protruding part 121 may be formed on the lower surface of one side of the first fixing block 120.
  • the first protruding part 121 may be formed to be protruded downward.
  • the first protruding part 121 may be fitted and coupled to the first fixing groove 103 formed on the corresponding part of the first protruding part 121 in the lower surface 102 of the lower rail 100.
  • the first protruding part 121 enables the coupling between the first fixing block 120 and the lower rail 100 to be stronger. In particular, it prevents the first fixing block 120 from rotating around the first screw (T1) fixing part upon screw coupling.
  • the second fixing block 130 may be hexahedron.
  • a second coupling hole 133 is formed on the other surface of the second fixing block 130.
  • the second coupling hole 133 is formed to be depressed inward from one surface of the first fixing block 120.
  • the second coupling hole 133 is a configuration to which the other end of the lead screw 110 is fitted and fixed, and has the same shape as that of the other end of the lead screw 110.
  • the other end of the lead screw 110 is inserted into and fixed to the second coupling hole 133.
  • the second fixing block 130 has the following configuration so as to be firmly coupled to and fitted to the lead screw 110 and, at the same time, to the lower rail 100.
  • a second screw hole 132 is formed on the lower surface of the second fixing block 130.
  • the second screw hole 132 is formed to be depressed upward from the lower surface of the second fixing block 130 and has a female thread formed on the inner surface thereof. Up to this point, it is not different from to the first screw hole 122 of the first fixing block 120.
  • the second screw hole 132 is formed on the second coupled hole 133 and is formed to be perpendicular to the second coupling hole 133. Furthermore, the second screw hole 132 is formed to be bored through the lower side of the second coupling hole 133.
  • the second screw hole 132 is a configuration for the coupling with the lower surface 102 of the lower rail 100, and is contacted against and screw-coupled to the second fixing hole 106 formed on the corresponding portion of the second screw hole 132 of the lower surface 102 through a second screw T2.
  • the second screw T2 is fixed such that the end of the second screw T2 is protruded over the second coupling hole 133 upon the fixing of the second fixing block 130 and the lower rail 100.
  • the end of the second screw T2 is fitted to and presses the screw fixing groove 112, so that the second fixing block 130 and the lower rail 100 are fixed to each other through the second screw T2 and, at the same time, the lead screw 110 and the second fixing block 130 are firmly fixed to each other.
  • a second protruding part 131 may be formed on the lower surface of the other side of the second fixing block 130.
  • the second protruding part 131 may be formed to be protruded downward.
  • the second protruding part 131 may be fitted and coupled to the second fixing groove 104 formed on the corresponding part of the second protruding part 131 in the lower surface 102 of the lower rail 100.
  • the second protruding part 131 enables the coupling between the second fixing block 130 and the lower rail 100 to be stronger.
  • the second fixing block 130 prevents the second screw (T2) fixing part from rotating around the center axis thereof upon screw coupling.
  • the lead screw assembly method performs a first step S1 in which one end of the lead screw 110 is press-fitted to the first fixing block 120 although not shown in figures.
  • the knurling part 111 is formed on one end of the lead screw 110, thereby enabling this fixing to be stronger upon press-fitting.
  • a second step S2 is performed in which the second fixing block 130 is fitted to the other end of the lower rail 100.
  • the second fixing block 130 is fitted from upward to downward, and, at this time, the second protruding part 131 of the second fixing block 130 is fitted and coupled to the second fixing groove 104 of the lower rail 100.
  • a third step S3 is performed in which the lead screw 110 is fitted to the gearbox 400. Since the first fixing block 120 has been coupled to the one end of the lead screw 110, the gearbox 400 is fitted to the other end of the lead screw 110.
  • a fourth step S4 is performed in which the gearbox 400 to which the lead screw 110 is fitted is assembled to the upper rail 200. As described above, the gearbox 400 to which the lead screw 110 is fitted is mounted in the inside of the upper rail 200.
  • a fifth step S5 is performed in which the upper rail 200 is fitted to the lower rail 100 by sliding thereon and the first fixing block 120 to which the lead screw 110 is press-fitted is fitted to the one end of the lower rail 100 by sliding thereon.
  • the first fixing block 120 slides on and is coupled to the lower rail 100 in the longitudinal direction rather than from upward to downward when fitted to the lower rail 100, obstruction may occur upon coupling if the height of the first protruding part 121 become high. Therefore, the height of the first protruding part 121 may be determined to be 1mm or below and the inclined protruding part 121a is formed on the other end of the first protruding part 121 for fixable coupling.
  • the first protruding part 121 of the first fixing block 120 is fitted and coupled to the first fixing groove 103 of the lower rail 100.
  • a sixth step S6 is performed in which the lower rail 100 and the second fixing block 130 are fixed to each other through the second fixing hole 106 and the second screw hole 132 using the second screw T2, and, at the same time, the second fixing block 130 and the other end of the lead screw 110 are fixed to each other through the screw fixing groove 112 of the lead screw 110.
  • the assembly of the lead screw is completed by performing a seventh step S7 in which the lower rail 100 and the first fixing block 120 are fixed to each other through the first fixing hole 105 and the first screw hole 122 using the first screw T1.

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  • Engineering & Computer Science (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Seats For Vehicles (AREA)

Abstract

The present invention relates to a combination structure of a lead screw for a motor-operated seat track and an assembly method therefor, and more particularly, to a combination structure of a lead screw and an assembly method therefor in which the configuration thereof is simplified, the assembly thereof is easy and the assembly is firm when the lead screw is coupled to a lower rail. According to the combination structure of a lead screw for a motor-operated seat track and an assembly method therefor according to the present invention, the couplings of the lead screw, the fixing block and the lower rail is simultaneously made without lowering of theirs coupling strength, so that the productivity is improved due to simplification of an assembly process and the cost of elements is lowered because the number of elements is decreased.

Description

COMBINATION STRUCTURE OF LEAD SCREW FOR MOTOR-OPERATED SEAT TRACK AND ASSEMBLY METHOD THEREFOR
The present invention relates to a combination structure of a lead screw for a motor-operated seat track and an assembly method therefor, and more particularly, to a combination structure of a lead screw and an assembly method therefor in which the configuration thereof is simplified, the assembly thereof is easy and the assembly is firm when the lead screw is coupled to a lower rail.
Generally, the seat of a vehicle is for maintaining the seated posture of a passenger to be an optimized state, and is constructed to include a seat back configured to support the passenger’s upper body and a seat cushion configured to support the passenger’s lower body, such as buttocks, thighs and the like.
Furthermore, in order for the somatotype of a passenger and the efficient utilization of the vehicle’s interior space, the seat of the vehicle is mounted to be slidably movable in the forward-backward direction of the vehicle’s body over a predetermined range, which is enabled by a seat track.
The seat track is configured to include a lower rail mounted to be fixed to a floor panel in the longitudinal direction of the vehicle body and an upper rail coupled to be slidably movable along the lower rail and coupled to the seat cushion.
Methods for sliding an upper rail are classified into a manual method for manually manipulating it and a motor-operated method for driving it using a motor.
In the motor-operated method, power is supplied from a battery to the motor through the switch manipulation of a user, so that the upper rail slides along the lower rail in a frontward or backward direction through the driving of the motor, thereby enabling the seat of the vehicle to move in the forward-backward direction of the vehicle’s body over a predetermined range. Due to this, it is possible to efficiently utilize the interior space and for a person seated on the seat to feel comfortable ride. Furthermore, the motor-operated method makes it possible to conveniently manipulate a seat in the forward-backward direction and allows fine control, compared to the manual method.
The structure of a motor-operated seat track is described with reference to drawings in detail. As shown in FIGS. 1 and 2, the motor-operated seat track conventionally is configured to include a lower rail 100 mounted to be fixed to a floor panel of a vehicle in the longitudinal direction of the vehicle’s body, an upper rail 200 coupled to be slidably movable along the lower rail 100 and coupled to a seat cushion, a motor driving unit 300 configured to slide the upper rail 200, and a gearbox 400 configured to move forward or backward along a lead screw 110 mounted in the lower rail 100 by the driving of the motor driving unit 300 to slide the upper rail 200.
Since the gearbox 400 slides along the lead screw 110 as shown in FIGS 3 and 4, the lead screw 110 is mounted in the lower rail 100 by fitting and coupling it’s both ends to first and second fixing blocks 120 and 130 and then coupling the lower surfaces of the first and second fixing blocks 120 and 130 to the upper surface of the lower rail 100.
In this case, if the lead screw 110 is not firmly fixed to the lower rail 100, vibrations or noisy may occur when the gearbox 400 fixed to the upper rail 200 moves along the lead screw 110.
Accordingly, a conventional lead screw combination structure includes separately a structure configured to fix the lead screw 110 to the first and second fixing blocks 120 and 130 and a structure configured to fix the first and second fixing blocks 120 and 130 to the lower rail 100, so that problems occur in which an assembly process is complicated and manufacturing cost become high.
An object of the present invention provides a combination structure of a lead screw for a motor-operated seat track and an assembly method therefor in which one end of the lead screw is formed integrally with a fixing block, and the other end functions to fix the lead screw when the fixing block is coupled to an upper rail, thereby simultaneously obtaining the couplings of the lead screw, the fixing block and the lower rail.
According to the present invention, a combination structure of a lead screw for a motor-operated seat track, the motor-operated seat track including a lower rail 100 fixed to and mounted in a lower surface of an inside of a vehicle, an upper rail 200 fixedly mounted at a bottom surface of a seat of a motor vehicle and inserted into the lower rail 100 to be slid in a longitudinal direction of the lower rail 100 and a gearbox 400 inserted into and fixed to the upper rail 200, the combination structure, includes: a lead screw 110 having a male thread formed on an outer surface thereof so as for the gearbox 400 to be fitted thereto and mounted in a longitudinal direction related to front and rear of the vehicle; a first fixing block 120 having a first coupling hole123 formed on the other surface thereof so as for one end of the lead screw 110 to be fitted thereto and a first screw hole 122 for coupling with the lower rail 100 formed on a lower surface thereof; and a second fixing block 130 having a second coupling hole133 formed on one surface thereof so as for the other end of the lead screw 110 to be fitted thereto and a second screw hole 132 for coupling with the lower rail 100 formed on a lower surface thereof, wherein on a bottom surface 102 of the lower rail 100, a first fixing hole 105 is bored therethrough to correspond to the first screw hole 122 and is screw-coupled thereto through a first screw T1, and a second fixing hole 106 is bored therethrough to correspond to the second screw hole 132 and is screw-coupled thereto through a second screw T2.
On an outer surface of the one end of the lead screw 110, a knurling part 111 may be formed, and the knurling part 111 may be press-fitted and fixed to the first coupling hole 123.
The other end of the lead screw 110 may be fitted and coupled to the second coupling hole 133, where the second screw hole 132 is formed under the second coupling hole 133 to be perpendicular to the second coupling hole 133 and is formed to bored through a lower side of the second coupling hole 133 such that a distal end of the second screw T2 is protruded over the second coupling hole 133, and a screw fixing groove 112 is formed on a lower surface of the other end of the lead screw 110 such that the distal end of the second screw T2 is fitted and press-fixed thereto.
The combination structure includes a first protruding part 121 formed on a lower surface of one side of the first fixing block 120 to be protruded downward; a first fixing groove 103 formed on the bottom surface 102 of the lower rail 100 so as to the first protruding part 121 to be fitted and coupled thereto; a second protruding part 131 formed on a lower surface of the other side of the second fixing block 130 to be protruded downward; and a second fixing groove 104 formed on the bottom surface 102 of the lower rail 100 so as to the second protruding part 131 to be fitted and coupled thereto.
The first protruding part 121 may have an inclined protruding part 121a gradually decreasing in its protruding length toward the other side end.
In another general aspect, a method for assembling a lead screw includes: a first step S1 in which one end of the lead screw 110 is press-fitted to the first fixing block 120; a second step S2 in which the second fixing block 130 is fitted to the other end of the lower rail 100 from upward to downward; a third step S3 in which the lead screw 110 is fitted to the gearbox 400; a fourth step S4 in which the gearbox 400 to which the lead screw 110 is fitted to the upper rail 200 is assembled; a fifth step S5 in which the upper rail 200 is fitted to the lower rail 100 by sliding thereon and the first fixing block 120 to which the lead screw 110 is press-fitted is fitted to the one end of the lower rail 100 by sliding thereon; a sixth step S6 in which, using the second screw T2, the lower rail 100 and the second fixing block 130 are fixed to each other and, at the same time, the second fixing block 130 and the other end of the lead screw 110 are fixed to each other; and a seventh step S7 in which the lower rail 100 and the first fixing block 120 are fixed to each other using the first screw T1.
According to the combination structure of a lead screw and the assembly method as configured above, the couplings of the lead screw, the fixing block and the lower rail is simultaneously made without lowering of theirs coupling strength, compared to the prior art, so that the productivity is improved due to simplification of an assembly process and the cost of elements is lowered because the number of elements is decreased.
FIG. 1 is a basic perspective view showing a motor-operated seat track;
FIG. 2 is a perspective view showing the combination structure of a lead screw according to the present invention;
FIG. 3 is a perspective view showing the combination structure of a lead screw of which a upper rail is eliminated according to the present invention;
FIG. 4 is an exploded perspective view showing the combination structure of a lead screw of which an upper rail is eliminated according to the present invention;
FIG. 5 is an exploded perspective view showing the combination structure of a lead screw when viewed from the lower surface according to the present invention;
FIG. 6 is a cross-sectional view showing the combination structure of a second fixing block according to the present invention;
FIG. 7 is an exploded perspective view showing the second step of an assembly method according to the present invention;
FIG. 8 is an exploded perspective view showing the third and fourth steps of the assembly method according to the present invention;
FIG. 9 is an exploded perspective view showing the fifth step of the assembly method according to the present invention; and
FIG. 10 is an exploded perspective view showing the sixth and seventh steps of the assembly method according to the present invention.
Prior to description of embodiments of the present invention, a motor-operated seat track to which a lead screw combination structure according to the present invention is applied is briefly described with reference to figures.
Referring to FIGS. 1 and 2, the motor-operated seat track conventionally is configured to include a lower rail 100 mounted to be fixed to a floor panel of a vehicle in the longitudinal direction of the vehicle’s body, an upper rail 200 coupled to be slidably movable along the lower rail 100 and coupled to a seat cushion, a motor driving unit 300 configured to slide the upper rail 200, and a gearbox 400 configured to move forward or backward along a lead screw 110 mounted in the lower rail 100 by the driving of the motor driving unit 300 to slide the upper rail 200.
The structure of the motor-operated seat track is configured such that all configurations thereof are formed to have left and right parts symmetrical to each other, so that, in this embodiment, only any one part’s configuration is described in detail
Hereinafter, an exemplary embodiment of the present invention will be described in detail with reference to the accompanying drawings.
Referring to FIGS. 3 to 5, the combination structure of the lead screw according to the present invention is configured to include a lower rail 100, a lead screw 110, a first fixing block 120 and a second fixing block 130.
The lower rail 100 may be fixed to the lower surface of the inside of a vehicle. The lower rail 100 may be formed in a longitudinal direction related to the front and rear of the vehicle. The lower rail 100 can be formed such that both sides thereof are extended upward with respect to the lower surface 102 thereof and are then bended toward its center when viewed from the cross-sectional surface of the lower rail 100. In the both sides bended toward the lower rail’s center, flanges 101 bended downward may be formed respectively.
The lower surface 102 of the lower rail 100 may have a first fixing hole 105 bored therethrough in one end and a second fixing hole 106 bored therethrough in the other end.
The lead screw 110 may be mounted along the longitudinal direction in the lower surface 102 of the lower rail 100. The lead screw 110 is made of a cylindrical stick. A male thread may be formed on the outer peripheral surface of the lead screw 110.
In this case, a knurling part 111 is formed on the outer surface of one end part of the lead screw 110. This is a configuration to be press-fitted and fixed to the first fixing block 120 which is described below upon the description of the first fixing block 120. The knurling part 111 is formed using a conventional knurling method, details of which are omitted.
Furthermore, a screw fixing groove 112 may be formed on the lower surface of the other end part of the lead screw 110. The screw fixing groove 112 may be formed to be depressed upward from the lower surface of the lead screw 110. In this case, the lower surface of the lead screw 110 is defined to be a surface facing downward when the lead screw 110 is fixed to the first fixing block 120 and the second fixing block 130 and mounted in the lower rail 100. The screw fixing groove 112 is for firming the combination with the second fixing block 130, which is described below when the second fixing block 130 is described.
The first fixing block 120 may be hexahedron. A first coupling hole 123 is formed on the other surface of the first fixing block 120. The first coupling hole 123 is formed to be depressed inward from the other surface of the first fixing block 120. The first coupling hole 123 is a configuration to which one end of the lead screw 110 is fitted and fixed, and has the same shape as that of the one end of the lead screw 110. The knurling part 111 is press-fitted and fixed to the first coupling hole 123. Accordingly, the one end of the lead screw 110 and the first fixing block 120 are coupled to each other without a separate fastening member, and firm coupling is possible.
A first screw hole 122 is formed on the lower surface of the first fixing block 120. The first screw hole 122 is formed to be depressed upward from the lower surface of the first fixing block 120 and has a female thread formed on the inner surface thereof. The first screw hole 122 is a configuration for the coupling with the lower surface 102 of the lower rail 100, and is contacted against and screw-coupled to the first fixing hole 105 formed on the corresponding portion of the first screw hole 122 of the lower surface 102 through a first screw T1. Furthermore, a first protruding part 121 may be formed on the lower surface of one side of the first fixing block 120. The first protruding part 121 may be formed to be protruded downward. The first protruding part 121 may be fitted and coupled to the first fixing groove 103 formed on the corresponding part of the first protruding part 121 in the lower surface 102 of the lower rail 100. The first protruding part 121 enables the coupling between the first fixing block 120 and the lower rail 100 to be stronger. In particular, it prevents the first screw (T1) fixing part from rotating around the center axis thereof upon screw coupling.
The first protruding part 121 may be formed to have a height of 1mm or below. Furthermore, an inclined protruding part 121a gradually decreasing in its protruding length toward the other side end may be formed in the first protruding part 121. The first protruding part 121 is assembled to be slidable on its sides in the longitudinal direction rather than is assembled to the lower rail 100 from upward to downward, so that the height of the first protruding part 121 must not be high, which is described below in a method of assembling the lead screw. If the first protruding part 121 is formed to be high, obstruction may occur upon the assembly of the first fixing block 120. In addition, the first protruding part 121 can be smoothly coupled to the first fixing groove 103 through the inclined protruding part 121a of the first protruding part 121 when fitted and coupled thereto.
The first fixing block 120 may be hexahedron. A first coupling hole 123 is formed on the other surface of the first fixing block 120. The first coupling hole 123 is formed to be depressed inward from the other surface of the first fixing block 120. The first coupling hole 123 is a configuration to which one end of the lead screw 110 is fitted and fixed, and has the same shape as that of the one end of the lead screw 110. The knurling part 111 is press-fitted and fixed to the first coupling hole 123. Accordingly, the one end of the lead screw 110 and the first fixing block 120 are coupled to each other without a separate fastening member, and firm coupling is possible.
A first screw hole 122 is formed on the lower surface of the first fixing block 120. The first screw hole 122 is formed to be depressed upward from the lower surface of the first fixing block 120 and has a female thread formed on the inner surface thereof. The first screw hole 122 is a configuration for the coupling with the lower surface 102 of the lower rail 100, and is contacted against and screw-coupled to the first fixing hole 105 formed on the corresponding portion of the first screw hole 122 of the lower surface 102 through a first screw T1. Furthermore, a first protruding part 121 may be formed on the lower surface of one side of the first fixing block 120. The first protruding part 121 may be formed to be protruded downward. The first protruding part 121 may be fitted and coupled to the first fixing groove 103 formed on the corresponding part of the first protruding part 121 in the lower surface 102 of the lower rail 100. The first protruding part 121 enables the coupling between the first fixing block 120 and the lower rail 100 to be stronger. In particular, it prevents the first fixing block 120 from rotating around the first screw (T1) fixing part upon screw coupling.
The second fixing block 130 may be hexahedron. A second coupling hole 133 is formed on the other surface of the second fixing block 130. The second coupling hole 133 is formed to be depressed inward from one surface of the first fixing block 120. The second coupling hole 133 is a configuration to which the other end of the lead screw 110 is fitted and fixed, and has the same shape as that of the other end of the lead screw 110. The other end of the lead screw 110 is inserted into and fixed to the second coupling hole 133. In this case, the second fixing block 130 has the following configuration so as to be firmly coupled to and fitted to the lead screw 110 and, at the same time, to the lower rail 100.
Referring to FIG. 6, a second screw hole 132 is formed on the lower surface of the second fixing block 130. The second screw hole 132 is formed to be depressed upward from the lower surface of the second fixing block 130 and has a female thread formed on the inner surface thereof. Up to this point, it is not different from to the first screw hole 122 of the first fixing block 120. In this case, the second screw hole 132 is formed on the second coupled hole 133 and is formed to be perpendicular to the second coupling hole 133. Furthermore, the second screw hole 132 is formed to be bored through the lower side of the second coupling hole 133.
The second screw hole 132 is a configuration for the coupling with the lower surface 102 of the lower rail 100, and is contacted against and screw-coupled to the second fixing hole 106 formed on the corresponding portion of the second screw hole 132 of the lower surface 102 through a second screw T2. In this case, the second screw T2 is fixed such that the end of the second screw T2 is protruded over the second coupling hole 133 upon the fixing of the second fixing block 130 and the lower rail 100. Accordingly, when the other end of the lead screw 100 is coupled to the second coupling hole 133, the end of the second screw T2 is fitted to and presses the screw fixing groove 112, so that the second fixing block 130 and the lower rail 100 are fixed to each other through the second screw T2 and, at the same time, the lead screw 110 and the second fixing block 130 are firmly fixed to each other.
Furthermore, a second protruding part 131 may be formed on the lower surface of the other side of the second fixing block 130. The second protruding part 131 may be formed to be protruded downward.
The second protruding part 131 may be fitted and coupled to the second fixing groove 104 formed on the corresponding part of the second protruding part 131 in the lower surface 102 of the lower rail 100. The second protruding part 131 enables the coupling between the second fixing block 130 and the lower rail 100 to be stronger. In particular, the second fixing block 130 prevents the second screw (T2) fixing part from rotating around the center axis thereof upon screw coupling.
A method for assembling the lead screw as configured above according to the present invention is described below with reference to figures.
The lead screw assembly method performs a first step S1 in which one end of the lead screw 110 is press-fitted to the first fixing block 120 although not shown in figures. In this case, the knurling part 111 is formed on one end of the lead screw 110, thereby enabling this fixing to be stronger upon press-fitting.
Referring to FIG. 7, after the performance of the first step S1, a second step S2 is performed in which the second fixing block 130 is fitted to the other end of the lower rail 100. The second fixing block 130 is fitted from upward to downward, and, at this time, the second protruding part 131 of the second fixing block 130 is fitted and coupled to the second fixing groove 104 of the lower rail 100.
Referring to FIG. 8, after the performance of the second step S2, a third step S3 is performed in which the lead screw 110 is fitted to the gearbox 400. Since the first fixing block 120 has been coupled to the one end of the lead screw 110, the gearbox 400 is fitted to the other end of the lead screw 110.
After the performance of the third step S3, a fourth step S4 is performed in which the gearbox 400 to which the lead screw 110 is fitted is assembled to the upper rail 200. As described above, the gearbox 400 to which the lead screw 110 is fitted is mounted in the inside of the upper rail 200.
Referring to FIG. 9, after the performance of the fourth step S4, a fifth step S5 is performed in which the upper rail 200 is fitted to the lower rail 100 by sliding thereon and the first fixing block 120 to which the lead screw 110 is press-fitted is fitted to the one end of the lower rail 100 by sliding thereon. In this case, since the first fixing block 120 slides on and is coupled to the lower rail 100 in the longitudinal direction rather than from upward to downward when fitted to the lower rail 100, obstruction may occur upon coupling if the height of the first protruding part 121 become high. Therefore, the height of the first protruding part 121 may be determined to be 1mm or below and the inclined protruding part 121a is formed on the other end of the first protruding part 121 for fixable coupling. In this case, the first protruding part 121 of the first fixing block 120 is fitted and coupled to the first fixing groove 103 of the lower rail 100.
Referring to FIG. 10, after the performance of the fifth step S5, a sixth step S6 is performed in which the lower rail 100 and the second fixing block 130 are fixed to each other through the second fixing hole 106 and the second screw hole 132 using the second screw T2, and, at the same time, the second fixing block 130 and the other end of the lead screw 110 are fixed to each other through the screw fixing groove 112 of the lead screw 110. Through this step, an advantage is generated in which the lower rail 100, the second fixing block 130 and the other end of the lead screw 110 are simultaneously fixed to each other only by the process of coupling the second screw T2.
After the performance of the sixth step S6, the assembly of the lead screw is completed by performing a seventh step S7 in which the lower rail 100 and the first fixing block 120 are fixed to each other through the first fixing hole 105 and the first screw hole 122 using the first screw T1.
Although the exemplary embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims. Accordingly, the scope of the present invention should not be limited to the above-described embodiments but should be determined by not only the appended claims but also the equivalents thereof

Claims (6)

  1. A combination structure of a lead screw for a motor-operated seat track, the motor-operated seat track including a lower rail 100 fixed to and mounted in a lower surface of an inside of a vehicle, an upper rail 200 fixedly mounted at a bottom surface of a seat of a motor vehicle and inserted into the lower rail 100 to be slid in a longitudinal direction of the lower rail 100 and a gearbox 400 inserted into and fixed to the upper rail 200, the combination structure comprising:
    a lead screw 110 having a male thread formed on an outer surface thereof so as for the gearbox 400 to be fitted thereto and mounted in a longitudinal direction related to front and rear of the vehicle;
    a first fixing block 120 having a first coupling hole123 formed on the other surface thereof so as for one end of the lead screw 110 to be fitted thereto and a first screw hole 122 for coupling with the lower rail 100 formed on a lower surface thereof; and
    a second fixing block 130 having a second coupling hole133 formed on one surface thereof so as for the other end of the lead screw 110 to be fitted thereto and a second screw hole 132 for coupling with the lower rail 100 formed on a lower surface thereof,
    wherein on a bottom surface 102 of the lower rail 100, a first fixing hole 105 is bored therethrough to correspond to the first screw hole 122 and is screw-coupled thereto through a first screw T1, and a second fixing hole 106 is bored therethrough to correspond to the second screw hole 132 and is screw-coupled thereto through a second screw T2.
  2. The combination structure of a lead screw for a motor-operated seat track of claim 1, wherein
    on an outer surface of the one end of the lead screw 110, a knurling part 111 is formed, and the knurling part 111 is press-fitted and fixed to the first coupling hole 123.
  3. The combination structure of a lead screw for a motor-operated seat track of claim 1, wherein the other end of the lead screw 110 is fitted and coupled to the second coupling hole 133,
    where the second screw hole 132 is formed under the second coupling hole 133 to be perpendicular to the second coupling hole 133 and is formed to bored through a lower side of the second coupling hole 133 such that a distal end of the second screw T2 is protruded over the second coupling hole 133, and
    a screw fixing groove 112 is formed on a lower surface of the other end of the lead screw 110 such that the distal end of the second screw T2 is fitted and press-fixed thereto.
  4. The combination structure of a lead screw for a motor-operated seat track of claim 1, wherein the combination structure includes
    a first protruding part 121 formed on a lower surface of one side of the first fixing block 120 to be protruded downward;
    a first fixing groove 103 formed on the bottom surface 102 of the lower rail 100 so as to the first protruding part 121 to be fitted and coupled thereto;
    a second protruding part 131 formed on a lower surface of the other side of the second fixing block 130 to be protruded downward; and
    a second fixing groove 104 formed on the bottom surface 102 of the lower rail 100 so as to the second protruding part 131 to be fitted and coupled thereto.
  5. The combination structure of a lead screw for a motor-operated seat track of claim 4, wherein
    The first protruding part 121 has an inclined protruding part 121a gradually decreasing in its protruding length toward the other side end.
  6. A method for assembling a lead screw of any one of claims 1 to 5, comprising:
    a first step S1 in which one end of the lead screw 110 is press-fitted to the first fixing block 120;
    a second step S2 in which the second fixing block 130 is fitted to the other end of the lower rail 100 from upward to downward;
    a third step S3 in which the lead screw 110 is fitted to the gearbox 400;
    a fourth step S4 in which the gearbox 400 to which the lead screw 110 is fitted to the upper rail 200 is assembled;
    a fifth step S5 in which the upper rail 200 is fitted to the lower rail 100 by sliding thereon and the first fixing block 120 to which the lead screw 110 is press-fitted is fitted to the one end of the lower rail 100 by sliding thereon;
    a sixth step S6 in which, using the second screw T2, the lower rail 100 and the second fixing block 130 are fixed to each other and, at the same time, the second fixing block 130 and the other end of the lead screw 110 are fixed to each other; and
    a seventh step S7 in which the lower rail 100 and the first fixing block 120 are fixed to each other using the first screw T1.
PCT/KR2010/008880 2010-07-14 2010-12-13 Combination structure of lead screw for motor-operated seat track and assembly method therefor WO2012008663A1 (en)

Applications Claiming Priority (2)

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KR1020100067906A KR101126111B1 (en) 2010-07-14 2010-07-14 Combination Structure of Leadscrew for Power Seat Track and Assembly Method of the same
KR10-2010-0067906 2010-07-14

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US10723244B2 (en) * 2017-07-17 2020-07-28 Faurecia Sieges D'automobile Rail for vehicle seat and vehicle seat comprising such a rail

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JPH07232578A (en) * 1994-02-25 1995-09-05 Ikeda Bussan Co Ltd Seat slide device
JP2000158983A (en) * 1998-11-26 2000-06-13 Aisin Seiki Co Ltd Power seat slide device for vehicle
KR20070102306A (en) * 2006-04-14 2007-10-18 주식회사 캄코 Vehicle seat slide mechanism with the nuts
JP2009241697A (en) * 2008-03-31 2009-10-22 Fuji Kiko Co Ltd Electrically operated seat slide device

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Publication number Priority date Publication date Assignee Title
US10723244B2 (en) * 2017-07-17 2020-07-28 Faurecia Sieges D'automobile Rail for vehicle seat and vehicle seat comprising such a rail

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KR20120007248A (en) 2012-01-20

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