KR102527551B1 - Seat Track Structure for Vehicle - Google Patents

Abstract

The present invention relates to a seat track structure for automobiles, which improves the structure of a lead screw and enables emergency movement of a seat to be controlled. an upper rail slidably installed on the lower rail while being fixed to the lower surface of the seat; a gearbox fixed to the upper rail and having a worm gear driven by a drive source inside and a worm wheel gear that moves in forward and backward directions on the flexible lead screw of the lower rail while being meshed with the worm gear; and lock units disposed on both sides of the gearbox and blocking emergency forward and backward movement of the gearbox in case of a vehicle collision.

Description

Seat Track Structure for Vehicle {Seat Track Structure for Vehicle}

The present invention relates to a seat track structure for a vehicle, and more particularly, to a seat track structure for a vehicle that can improve the structure of a lead screw and control the emergency movement of a seat.

In general, a seat of a vehicle includes a seat back and a seat cushion, and a slide device of a seat track is installed to slide the seat cushion in the front and rear directions of the vehicle body.

As shown in FIG. 1, the seat track 50 includes a lower rail 10 fixedly installed on a floor panel of a vehicle, an upper rail 30 coupled to be slidably moved along the lower rail 10 and installed with a seat, It is configured to include a gear box 40 that moves in the forward and backward directions while riding on the lead screw 20 installed on the lower rail 10 by a drive unit in a state fixed to the upper rail 30 .

The gearbox 40 includes a gearbox housing 41 in which a worm gear and a worm wheel gear are orthogonally engaged and installed, and a mid bracket 42 coupled to the upper rail 10 while supporting the gearbox housing 41 When the worm gear is rotated by the flexible shaft connected to the driving means, the worm wheel gear coupled to the lead screw rotates interlockingly to move the gear box 40 forward and backward on the lead screw 20.

However, since the normal upper and lower rails are formed by repeatedly folding a plate-shaped plate several times through press processing, it is practically difficult to match the parallelism and straightness between the upper and lower rails, and the gap between the folded surfaces during mutual coupling There is a problem with a lot of contact.

That is, when the upper rail moves along the fixed lower rail, severe noise is generated in the contact area in the section where the parallelism and straightness are out of sync.

In order to solve the above problem, a burnishing process is performed in which the upper rail and the lower rail are combined and the sliding process is repeated several times until the bearings and contact surfaces inside the upper and lower rails are in place. This is done until the noise reaches the set area.

However, since the burnishing process is a process of widening the tight gap between the upper and lower rails, the wider gap rather causes a bias in one direction when the force due to the transfer of the sheet is increased, so that the upper and lower rails Since the parallelism and straightness of the gearbox are displaced, there is a problem in that noise and vibration are generated severely according to the movement of the gearbox.

Korean Patent Publication No. 10-2012-0004206

The present invention has been made to solve the above problems and technical prejudices, so that the flexible lead screw can flexibly respond to the twisted direction of the gearbox even when the gearbox moves in a state where the parallelism or straightness of the lower rail is distorted. Its purpose is to provide a seat track structure for automobiles.

In order to achieve the above object, the vehicle seat track structure of the present invention includes a lower rail in which a flexible lead screw is installed in a longitudinal direction; an upper rail slidably installed on the lower rail while being fixed to the lower surface of the seat; a gearbox fixed to the upper rail and having a worm gear driven by a drive source inside and a worm wheel gear that moves in forward and backward directions on the flexible lead screw of the lower rail while being meshed with the worm gear; and lock units disposed on both sides of the gearbox and blocking emergency forward and backward movement of the gearbox in case of a vehicle collision.

At this time, the flexible lead screw, a metal wire having a predetermined length; And it is wound in a spiral direction while maintaining a constant pitch on the metal wire to form a screw thread, has elasticity so that it can be assembled corresponding to the screw thread of the worm wheel gear, and the lock by dynamically narrowing the screw thread pitch during the vehicle collision It is preferable to consist of; an elastic spiral member that drives the unit.

In addition, the cross section of the elastic spiral member is preferably circular or elliptical.

And, the lock unit is disposed on one side of the gear box, the lock housing having a receiving space to the inside; a rotary gear disposed inside the lock housing so as to be rotatable and ascending and descending, and rotating along the pitch of the elastic spiral member when the gearbox moves; a stopper disposed inside the lock housing to support the rotary gear and selectively inserted into a stop hole formed in the lower rail according to the elevation of the rotary gear; and an elastic member disposed inside the lock housing and elastically supporting the stopper so that the rotation gear is engaged with the pitch of the elastic spiral member.

In addition, it is preferable that a pair of extended rotation shafts are formed on both sides of the rotation gear, and the rotation shafts are respectively fitted into a pair of slots formed on both sides of the lock housing.

Finally, it is preferable that a plurality of locking protrusions inserted into the stop holes of the lower rail are formed on the stopper.

According to the vehicle seat track structure of the present invention having the above configuration, even when the seat is moved in a state where the parallelism or straightness is distorted with the lower rail during transport, the flexible lead screw coupled to the worm wheel gear is distorted with respect to the twisted direction of the gearbox. By making a flexible response, there is an excellent effect of enabling stable movement without noise and vibration of the gearbox.

In addition, by providing a lock unit to the gearbox, emergency movement of the gearbox is blocked in the event of a vehicle collision, thereby ensuring driver's safety.

1 is a cross-sectional perspective view showing a conventional seat track structure;
Figure 2 is a perspective view showing a seat track for a vehicle according to the present invention,
3 is an exploded perspective view in which FIG. 2 is disassembled;
4 is a main perspective view showing a state in which a gearbox is coupled to a flexible lead screw during construction of an automobile seat track according to the present invention;
5 is a sectional view of a main part along line II of FIG. 4;
6 is a cross-sectional view of a main part along line II-II of FIG. 4;
7 is a plan view of FIG. 4;
8 is a working diagram showing a state in which a lock unit is driven during configuration of a gearbox.

Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the accompanying drawings. Embodiments of the present invention may be modified in various forms, and the scope of the present invention should not be construed as being limited to the embodiments described below. These embodiments are provided to explain the present invention in more detail to those skilled in the art to which the present invention pertains. Accordingly, the shape of each element shown in the drawings may be exaggerated to emphasize a clearer explanation.

Terms such as first and second may be used to describe various components, but the components should not be limited by the terms. Terms are only used to distinguish one component from another.

Terms used in this application are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly dictates otherwise. In this application, the terms "include" or "have" are intended to designate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, but one or more other features It should be understood that the presence or addition of numbers, steps, operations, components, parts, or combinations thereof is not precluded.

Figure 2 is a perspective view showing a seat track for a vehicle according to the present invention, Figure 3 is an exploded perspective view in which Fig. 2 is disassembled, Figure 4 is a gearbox is coupled to a flexible lead screw during construction of the seat track for a vehicle according to the present invention It is a main perspective view showing the state, Figure 5 is a main portion sectional view along line II-I of FIG. 4, Figure 6 is a main sectional view along line II-II of FIG. 4, Figure 7 is a plan view of FIG. It is a working diagram showing the state in which the lock unit is driven.

As shown in FIGS. 2 to 8, the structure of the vehicle seat track 500 of the present invention includes a lower rail 100 in which a flexible lead screw 110 is installed in the longitudinal direction; an upper rail 200 slidably installed on the lower rail 100 while being fixed to the lower surface of the seat; A worm gear 341 fixed to the upper rail 200 and driven by a drive source inside and engaged with the worm gear 341 ride the flexible lead screw 110 of the lower rail 100 before and after a gearbox 300 having a worm wheel gear 342 moving in the direction; and a lock unit 400 disposed on both sides of the gearbox 300 and blocking emergency forward and backward movement of the gearbox 300 in case of a vehicle collision.

Prior to the description, the biggest feature of the present invention is that the lead screw to which the gearbox 300 is coupled has a flexible structure, and the gearbox 300 is provided with the lock unit 400, so that the lower rail 100 and Even if the parallelism or straightness of the upper rail 200 is distorted, noise and vibration are suppressed and the emergency movement of the gearbox 300 that occurs when a vehicle crashes is controlled.

The seat track 500 of the present invention transfers a seat inside a vehicle, and although not shown, two seat tracks 500 are configured to form a pair, and a driving motor is provided between the two seat tracks 500, On both sides of the driving motor, a shaft is provided that is coupled to the gearbox 300 of each seat track 500 and transmits rotational force to the gearbox 300.

The above seat track 500 includes a lower rail 100, an upper rail 200, a gearbox 300, and a lock unit 400.

The lower rail 100 allows the movement of the upper rail 200 to be described later, and is fixed to a floor panel constituting the interior of a vehicle while maintaining a predetermined length in the front and rear directions.

As shown in FIGS. 2 and 3 , the lower rail 100 is combined with an upper rail 200 to be described later, and has a plurality of bending parts so that the upper rail 200 to be described later can be slid.

In addition, a flexible lead screw 110 having a flexible property along the longitudinal direction of the lower rail 100 is installed inside the lower rail 100 .

The flexible lead screw 110 is spirally coupled with the worm wheel gear 342 of the gear box 300 to be described later, so that the gear box 300 can move along the flexible lead screw 110 by the rotation of the worm wheel gear 342. let it be

To allow the flexible lead screw 110 to be disposed on the lower rail 100, fixing members 113 are coupled to both ends of the lower rail 100 in the longitudinal direction, respectively, and the flexible lead screw 110 is attached to each fixing member 113. ) Both ends of the distal end of the metal wire 111 to be described later are fixed.

Here, the flexible lead screw 110 may be composed of a metal wire 111 and an elastic spiral member 112.

The metal wire 111 is in the form of a string made by combining and twisting a plurality of thin steel wires, and generates bending even when subjected to a force exceeding the elastic limit.

The elastic spiral member 112 is wound in a spiral direction while maintaining a constant pitch along the longitudinal direction on the outer circumferential surface of the metal wire 111 to form a screw thread, thereby forming a thread of the worm wheel gear 342 inside the gear box 300 to be described later. It forms a screw thread and a helical bond.

Precisely, the elastic spiral member 112 is disposed on the metal wire 111 in the same way as a coil spring.

At this time, the elastic spiral member 112 is made of spring steel, and is wound on the metal wire 111 at regular intervals so that it can be assembled corresponding to the thread pitch of the worm wheel gear 342 in the longitudinal direction of the metal wire 111. It has elasticity towards

That is, even if the pitch formed by the elastic spiral member 112 is larger or smaller than the thread pitch inside the worm wheel gear 342, it can be assembled in response to the thread pitch of the worm wheel gear 342 through expansion and contraction between pitches.

In addition, the cross section of the elastic spiral member 112 is preferably formed in a circular or oval shape to minimize friction with the outer circumferential surface of the metal wire 111 so as not to interfere with the expansion and contraction between pitches, as shown in FIG.

Therefore, the flexible lead screw 110 has the flexibility of the metal wire 111 and the elasticity of the elastic spiral member 112 forming the screw thread, so that the direction of the gearbox 300 is mutually coupled to the upper rail 200 and Even if the lower rail 100 is distorted in the direction of the arrow shown in FIGS. 6 and 7 due to the slight gap or mismatch in parallelism and straightness of the lower rail 100, noise and vibration according to the movement of the gearbox 300 can be flexibly dealt with. suppress the occurrence.

In addition, since the expansion and contraction of the elastic spiral member 112 fluidly narrows the screw thread pitch in the event of a vehicle collision as well as assembly with the worm wheel gear 342, the lock unit 400 described later is driven to instantaneous movement of the gearbox 300 can also control.

That is, referring to FIG. 8, when a vehicle collision occurs in the right direction on the drawing as shown in FIG. force will work.

At this time, the gearbox 300 narrows the pitch of the elastic spiral member 112 wound around the metal wire 111 by the force to move instantaneously in the right direction on the drawing as shown in FIG. 8(b). And, in the process of narrowing the pitch of the elastic spiral member 112, the lock unit 400 to be described later operates, thereby preventing the gearbox 300 from emergency movement.

The upper rail 200 allows the seat of the vehicle to be transported forward and backward, and is slidably installed on the lower rail 100 while being fixed to the bottom surface of the seat.

At this time, the upper rail 200 has a plurality of bending parts (not marked) directed in the longitudinal direction as shown in FIGS. 2 and 3, and is slidably coupled to the lower rail 100 through the lower bending part.

And, although not shown, a normal seat is provided on the upper side of the upper rail 200, of course.

The gear box 300 transfers the upper rail 200 for forward and backward transfer of the sheet, and the flexible lead screw 110 is fixed at the center of the upper rail 200 in the longitudinal direction through a fixing bolt or the like. Ride and move forward and backward.

The gearbox 300 may include a worm gear 341 and a worm wheel gear 342 as shown in FIGS. 4 and 6 .

A fixing bracket 310 is provided on the outside of the gearbox 300 .

The fixed bracket 310 is coupled with the upper rail 200 having a seat, so that the gearbox 300 rides the flexible lead screw 110 by driving the worm gear 341 and the worm wheel gear 342. , so that it can move to the right.

In the center of the fixing bracket 310, both sides are open, and the vertical frame 321 and the horizontal frame 322 in which the housing 340 covering the worm gear 341 and the worm wheel gear 342 are seated. Is formed, and an extension frame 330 extending outwardly in a bent state is formed at the upper end of the vertical frame 321, and each vertical frame 321 has a worm wheel gear 342 and a flexible lead spirally coupled A through hole H through which the screw 110 passes is formed.

Inside the housing 340 seated in the recess 320 of the fixing bracket 310, as shown in FIG. 6, a worm gear 341 connected to a driving source (not shown) and driven by a driving source is disposed, and the worm gear 341 ) The lower portion of the worm gear 341 is meshed with the flexible lead screw 110 and is spirally coupled to the flexible lead screw 110 while rotating by the drive of the worm gear 341 Worm wheel gear that moves forward and backward 342 is placed.

At this time, the thread inside the worm wheel gear 342 coupled with the flexible lead screw 110 in a spiral may be formed through tap processing, or may be formed in a shape corresponding to the cross section of the elastic spiral member 112.

That is, in the gearbox 300, the upper rail ( 200), so that the sheet is eventually transported.

The lock unit 400 is to prevent the seat from being urgently moved in the direction of the force applied during a vehicle collision, and is disposed on both sides of the gearbox 300 and on both sides of the housing 340 with the same structure.

That is, the lock unit 400 is disposed on both sides of the gearbox 300, so that the front and rear emergency movement of the gearbox 300, which is responsible for the movement of the seat, can be performed even if a vehicle collision occurs in an unpredictable front or rear. This is to ensure the safety of occupants.

Hereinafter, since the lock units 400 on both sides of the gearbox 300 have the same structure, only a single lock unit 400 will be described.

As shown in FIGS. 4 to 6 and 8 , the above lock unit 400 includes a lock housing 410, a rotating gear 420, a stopper 430, and an elastic member 440.

The lock housing 410 has an approximate 'c' shape to have a receiving space with its lower side open to the inside, and a through hole H through which the flexible lead screw 110 passes is formed on one side, and the gearbox 300 ) is coupled to one side of the housing 340, which is one side.

The rotating gear 420 is disposed to be rotatable and liftable in the inner accommodation space of the lock housing 410 in a state in which a plurality of gear teeth 421 are formed, and the rotation of the worm wheel gear 342 through the rotation of the gearbox 300 When moving, the gear teeth 421 are attached to the flexible lead screw 110. While being sequentially inserted between the thread pitches formed by the winding of the elastic spiral member 112, it rotates along the pitch.

At this time, a pair of rotation shafts 422 extending in both directions are formed on both sides of the rotation gear 420, and the rotation shafts 422 are formed on both sides of the lock housing 410, respectively, and have a pair of slots having a predetermined curvature. By being fitted into each of the 411, the stopper 430 is lifted so that the stopper 430 is lowered so that the function of the stopper 430 to be described later is implemented along with the rotation of the rotation gear 420.

The stopper 430 is disposed under the rotational shaft 422 of the rotational gear 420 in the accommodation space inside the lock housing 410 to support the rotational shaft 422, and as the rotational gear 420 moves up and down, the lower rail 100 ) By being selectively fitted into a plurality of stop holes 100a formed along the longitudinal direction, the emergency movement of the gearbox 300 is blocked.

On one surface of the stopper 430 facing the lower rail 100, a plurality of protrusions protruding outward as shown in FIG. 6 to fit into the stop hole 100a formed in the lower rail 100 during descent ( 431) is formed.

In addition, support protrusions 432 are formed to protrude from both sides of the stopper 430 toward the lock housing 410 so that the stopper 430 can be supported by an elastic member 440 to be described later.

And, on the other side of the stopper 430 on which the protrusion 431 is formed, the vertical frame 321 and the horizontal frame 322 forming the recessed portion 320 of the housing 340 are connected to the upward and downward curved surface corresponding to the corner curved surface 433 is formed, and when the stopper 430 is raised and lowered, the lifting surface 433 serves as a guide so that the stopper 430 can be stably moved up and down along the corner curved surface.

In the elastic member 440, the gear teeth 421 of the rotary gear 420 are inserted between the thread pitch formed on the flexible lead screw 110 by the elastic spiral member 112, and the gear teeth 421 and the pitch are engaged. Elasticity is provided to elastically support the stopper 430 in the direction of the flexible lead screw 110 so that the state can be maintained.

The elastic member 440 is disposed in close contact with both inner surfaces of the lock housing 410, and has a locking portion 441 and a support portion 442 in an 'L' shape having a predetermined length.

The hooking part 441 formed upward in the drawing of the elastic member 440 has its distal end over the hook 412 formed in the lock housing 410, and the supporting part bent to a predetermined length from the lower side of the hooking part 441 ( 442 supports the lower side of the support protrusion 432 of the stopper 430 while maintaining elasticity.

In addition, a fixing protrusion protruding from the inner surface of the lock housing 410 to fix the position of the elastic member 440 for elastically supporting the stopper 430 at the bent portion where the hooking portion 441 and the support portion 442 meet. (413).

Therefore, since the elastic member 440 elastically supports the stopper 430 upward in the drawing, the rotational gear 420 supported by the stopper 430 is pushed up in the direction of the flexible lead screw 110, thereby rotating The gear teeth 421 of the gear 420 are inserted between the thread pitch formed on the flexible lead screw 110 by the elastic spiral member 112 as shown in the enlarged view of FIG. 6, so that the rotation gear 420 when the gear box 300 moves ) allows the gear teeth 421 to rotate while continuously inserting them between the screw thread pitches.

In addition, when the gearbox 300 is moved urgently, the stopper 430 interlocks with the descent of the rotation gear 420 to descend, so that the stopper 431 of the stopper 430 is moved to the stop hole 100a of the lower rail 100 ) to enter the interior to block the emergency movement of the gearbox 300.

A process of controlling the emergency movement of the gearbox 300 by the lock unit 400 having the above structure will be described as follows.

First, during normal movement without emergency movement of the gearbox 300, the elastic member 440 elastically supports the stopper 430 as shown in FIG. 8 (a) so that the stopper 430 and the lower rail 100 are spaced state

At this time, the rotating gear 420 rotates along the screw thread of the flexible lead screw 110 according to the forward and backward movement of the gearbox 300 .

Thereafter, when a collision of a vehicle occurs on the right side of the drawing as shown by the arrow shown in (a) of FIG. 8, the gearbox 300 momentarily exerts a force to move toward the right side of the drawing, and in this process the gear The thread pitch of the flexible lead screw 110 is instantaneously narrowed in the right direction as shown in (b) of FIG.

At this time, since the rotation gear 420 pushes the gear teeth 421 in the process of narrowing the thread pitch, it descends downward in the drawing along the slot 411 of the lock housing 410, and at the same time the stopper 430 also Descend by linking together.

And, the descending stopper 430 instantaneously enters the locking protrusion 431 into the stop hole 100a of the lower rail 100 to form a lock between the stopper 430 and the lower rail 100 The emergency movement of the gearbox 300 is blocked.

As described so far, in the vehicle seat track structure of the present invention, even if the seat is moved in a state where the parallelism or straightness is distorted with the lower rail during transport, the flexible lead screw coupled to the worm wheel gear is flexible with respect to the twisted direction of the gearbox. By making the correspondence, there is an excellent effect of enabling stable movement without noise and vibration of the gearbox.

In addition, by providing a lock unit to the gearbox, emergency movement of the gearbox is blocked in the event of a vehicle collision, thereby ensuring driver's safety.

Above, the vehicle seat track structure of the present invention has been described with preferred embodiments and accompanying drawings, but this is only intended to help understanding of the invention and is not intended to limit the technical scope of the invention thereto.

That is, various modifications or modifications are possible to those skilled in the art without departing from the technical gist of the present invention, and such changes or modifications are within the technical scope of the present invention in view of the interpretation of the claims. Needless to say, being within

100: lower rail 100a: stop hole
100: flexible lead screw 111: metal wire
112: elastic spiral member 200: upper rail
300: gear box 341: worm gear
342: worm wheel gear 400: lock unit
410: lock housing 411: slot
412: hook 420: rotation gear
422: axis of rotation 430: stopper
432: stumbling block 440: elastic member
500: seat track H: through hole

Claims (6)

In the structure of the vehicle seat track 500 for transporting the sheet,
a lower rail 100 in which a flexible lead screw 110 is installed in the longitudinal direction;
an upper rail 200 slidably installed on the lower rail 100 while being fixed to the lower surface of the seat;
A worm gear 341 fixed to the upper rail 200 and driven by a drive source inside and engaged with the worm gear 341 ride the flexible lead screw 110 of the lower rail 100 before and after a gearbox 300 having a worm wheel gear 342 moving in the direction; and
They are arranged on both sides of the gearbox 300 with the flexible lead screw 110 penetrating them, and rotate along the screw thread pitch of the flexible lead screw 110 while descending due to the narrowed screw thread pitch when a vehicle crashes. A lock unit 400 that blocks emergency forward and backward movement of the gearbox 300 through the gear 420; includes,
The flexible lead screw 110 includes a metal wire 111 having a predetermined length; And it is wound in a spiral direction while maintaining a constant pitch on the metal wire 111 to form a screw thread, and has elasticity so that it can be assembled corresponding to the screw thread of the worm wheel gear 342, and the screw thread pitch at the time of vehicle collision An automobile seat track structure, characterized in that composed of; delete According to claim 1,
The cross section of the elastic spiral member 112 is a seat track structure for vehicles, characterized in that circular or elliptical. According to claim 1,
The lock unit 400,
a lock housing 410 disposed on one side of the gear box 300 and having an accommodation space therein;
a rotating gear 420 disposed inside the lock housing 410 so as to be able to rotate and move up and down, and rotates along the pitch of the elastic spiral member 112 when the gear box 300 moves;
A stopper ( 430); and
An elastic member 440 disposed inside the lock housing 410 and elastically supporting the stopper 430 so that the rotation gear 420 is engaged with the pitch of the elastic spiral member 112; seat track structure for automobiles. According to claim 4,
A pair of extended rotation shafts 422 are formed on both sides of the rotation gear 420, and the rotation shafts 422 are fitted into a pair of slots 411 formed on both sides of the lock housing 410, respectively. Seat track structure for automobiles. According to claim 4,
Vehicle seat track structure, characterized in that the stopper (430) is formed with a plurality of locking protrusions (431) inserted into the stop hole (100a) of the lower rail (100).

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