WO2019156292A1 - Gearbox for automobile seat sliding - Google Patents

Abstract

The present invention relates to a gearbox for automobile seat sliding, which allows a worm shaft and worm wheel nut to be installed without the fabrication of individual housings and allows a seat to move by preventing the seat from being pushed at the time of collision. The gearbox comprises: a fixing bracket which is coupled to an upper rail having a seat and has a recessed portion formed at the longitudinal center portion thereof and having open opposite sides; a worm shaft and a worm wheel nut rotatably installed while being perpendicular to each other inside the recessed portion of the fixing bracket; a pair of support covers coupled to the opposite sides of the recessed portion of the fixed bracket so as to face each other and rotatably supporting the worm shaft; a pair of support plates installed in the recessed portion to be perpendicular to the supports covers, and rotatably supporting the worm wheel nut through a slide bush disposed in a slidable manner; and a locking unit installed in the recessed portion to be spaced apart from a lead screw while being adjacent to the slide bush, and locking, when an impact load occurs, with the lead screw while moving by the slide bush to block the movement of the gearbox.

Description

Gearbox for Car Seat Slide

The present invention relates to a gearbox for an automobile seat slide, and more particularly, for an automobile seat slide in which a worm shaft and a worm wheel nut are installed without making a separate housing, and the seat is moved by preventing the sheet from being pushed during a collision. It is about a gearbox.

Generally, a seat of a vehicle includes a seat back and a seat cushion, and a slide track slide device is installed to slide the seat cushion in a forward and backward direction of the vehicle body.

The seat track includes a lower rail fixed to the floor panel, and an upper rail coupled to slide along the lower rail and connected to a seat cushion. The seat slide device includes driving means for sliding the upper rail; It is configured to include a gear box for rotating the upper rail back and forth by rotating along the lead screw installed on the lower rail by the drive means.

The gear box is orthogonally installed to keep the worm shaft and the worm wheel nut in engagement with each other.When the worm shaft is rotated by the driving means, the worm wheel nut coupled to the lead screw rotates interlockingly and moves the gear box along the lead screw. Slid back.

The gearbox configured as described above can be slid of the seat by the driving means when the worm shaft and the worm wheel nut are precisely assembled in the housing, but the conventional gearbox is installed with the housing, the worm shaft and the worm wheel nut simply by adjusting the dimensions. Due to assembly tolerances between the worm shaft and the worm wheel nut and the housing, or by vibrations generated while the vehicle is running, there is a play between the worm shaft and the worm wheel nut, the housing and the worm shaft, the housing and the worm wheel nut installed in the housing. In addition, damage caused by friction occurs in the worm shaft and the worm wheel nut due to such play, and a loss occurs in power transmission between the worm shaft and the worm wheel nut.

In particular, when a load or vibration is applied to the seat, joints and play are caused between the worm wheel nut and the lead screw due to axial clearance, and gaps are generated due to wear due to long operation (durability). There was a problem.

In addition, the worm shaft and the worm wheel nut in the gearbox must be precisely assembled to be orthogonal to each other precisely, but the worm shaft and the worm wheel nut are not orthogonal to each other due to the clearance of the worm wheel nut. There were various problems.

In order to solve the above problems, Korean Patent Laid-Open No. 10-2017-0121495, In the gear box installed in the vehicle seat slide device; The gearbox includes a worm shaft installed in the installation space of the housing and connected to the drive shaft; A worm wheel nut installed in the installation space of the housing to be engaged with the worm shaft, and having a lead screw connected thereto; Housing so that one side is contacted and the other side is in contact with the housing around the outer surface of the worm wheel nut

And a preload member installed in an installation space located between the worm wheel nut and the worm wheel nut to generate a preload in a direction opposite to the worm wheel nut. The installation space of the housing includes: a first space in which the worm shaft is rotatable; And a second space in which the worm wheel nut is rotatably installed, wherein the second space is formed to communicate with the first space and communicates with the worm wheel nut space on both sides of the worm wheel nut space. The preload member space is formed so that the preload member is inserted into the preload member space. The preload member space communicates with the worm wheel nut space and communicates with the first preload space in which the contact support of the preload member is inserted. And a second preload space in which the elastic support of the preload member is inserted and installed therein, wherein the second preload space is inserted inclined to facilitate the insertion of the elastic support. And a support surface to which the elastic support piece of the elastic support portion is in contact with each other, the play of the worm wheel nut is prevented from flowing in the housing by the preload and the support of the preload member, and the worm wheel nut has a concentric circle and is configured to rotate. Disclosed is a gearbox for an automobile seat slide having a prevention function.

In addition, Korean Patent No. 10-1344390, the spindle drive for adjusting the vehicle seat in the longitudinal direction, the adjustment rail which can be adjusted in the longitudinal direction relative to the body mounting rail; And an adjustment mechanism including a drive worm and a spindle nut connected to the drive mechanism, wherein the external teeth of the spindle nut engage with the external teeth of the drive worm, and the internal teeth of the spindle nut engage with the external threads of the spindle. Wherein said spindle nut is formed of a hybrid spindle nut, said hybrid spindle nut having at least one function for shifting the impingement force and the functional force disposed in the force transmission path between said drive worm and said spindle from said adjustment rail to said spindle. Spindle drive technology having a reinforcement is disclosed.

However, Korean Patent Publication No. 10-2017-0121495 has the following problems.

First, there is a fatal problem in that the load on the housing is not distributed during the collision or static load strength test of the vehicle and the housing is damaged and the bracket is distorted.

As shown in FIG. 1, the escape hole 2 is formed in the longitudinal lower surface of the bracket 1 so that the projecting portion to which the coupling bolt is fastened for the assembly of the pair of housings can be avoided. This is because the strength of the bracket in this direction is weak. Therefore, the bracket must support the load transmitted through the housing, but due to the strength degradation due to the formation of the escape hole, as shown in FIG.

Second, when assembling the housing to the bracket, because the structure is assembled to the bracket in a state in which the dampers are fitted to both sides of the housing there is a problem that the cumulative tolerance between each component occurs to reduce the strength against impact.

Third, when the gearbox, that is, the bracket is fastened to the upper rail, a minute rotation is made in the direction in which the coupling bolt is fastened, there is a problem that noise occurs in each operation section due to unstable engagement of the worm shaft and the worm wheel nut. .

This is because, while one side of the bracket is fastened by the coupling bolt, the other side is fastened along the direction of engagement of the coupling bolt, so that the other side twists between the worm wheel nut and the lead screw even if the bracket is twisted finely. This is because noise is generated by stress.

And, Korean Patent No. 10-1344390, the projection is inserted between the reinforcing part by engaging the reinforcing part and the functional part by engaging the reinforcement part with the reinforcement part after the collision, but the reinforcement is inserted into the functional part injection As it is manufactured in such a way that the assembly process of matching the threads of the reinforcing part and the functional part so as to smoothly rotate the spindle is very difficult, and there is a problem in that the cost competitiveness is lowered due to the increase in processing cost.

The present invention has been made in order to solve the above problems and technical biases, so that the worm shaft and the worm wheel nut is installed in precisely engaged state inside the bracket without a separate housing, the installation of the gear box is fastened without twisting It is an object of the present invention to provide a gearbox for an automobile seat slide which can be made and the strength of the bracket can be reinforced.

In addition, there is another object that the movement of the seat is made in conjunction with the prevention of the sliding of the seat during the front collision of the vehicle.

Gear box for a vehicle seat slide of the present invention for achieving the above object is fixed to the upper rail having a seat, the fixing bracket having a depression in both sides open in the longitudinal center; A worm shaft and a worm wheel nut rotatably installed in an orthogonal state inside the recess of the fixing bracket; A pair of support covers coupled to both sides of the recess of the fixing bracket and rotatably supporting the worm shaft; A pair of support plates installed on the depression perpendicularly to the support cover and rotatably supporting the worm wheel nut through a slide bush slidably disposed; And a locking unit which is installed in the recess to be spaced apart from the lead screw in a state adjacent to the slide bush, and locks with the lead screw while moving by the slide bush when an impact load is generated to block the movement of the gear box. It is configured by.

At this time, the locking unit is installed to be spaced apart from the lead screw in the state that accommodates the lead screw, a bisecting locking body having a female screw thread engaged with the lead screw; A return member provided at one side of the locking body and having an elasticity to connect the divided locking body to be spaced apart from the lead screw; And an elastic ring provided on the other side of the locking body to maintain the elasticity of the return member.

The locking body may further include: a flange adjacent to the slide bush; An insertion groove formed along a radial direction to allow the return member to be inserted into a surface of the flange adjacent to the slide bush; And an insertion part which protrudes tapered from one surface of the flange and is inserted into a taper hole formed in the depression of the fixing bracket while the elastic ring is fitted.

In this case, the return member is preferably a 'C' shaped wire spring.

On the other hand, the support cover is preferably composed of a vertical piece formed with a coupling hole coupled to close one side of the recessed opening of the fixing bracket, a horizontal piece bent in a direction facing from the upper side of the vertical piece.

In addition, the depression of the fixing bracket and the support cover are coupled by interference fitting, a plurality of first fitting protrusions are formed on any one of the depression and the vertical piece, the first fitting protrusions on the other It is preferable that the first fitting grooves to be fitted are formed.

In this case, the support plate may be installed to be orthogonal to the support cover, the support plate is formed with a plurality of second fitting protrusions, the support cover is formed with the second fitting grooves are fitted with the second fitting protrusions desirable.

In addition, the slide bush is a sleeve which penetrates the slide hole of the support plate while the rotation shaft of the worm wheel nut is rotatably received, and is bent outwardly extending from the end of the sleeve to be adjacent to the support plate and the locking unit. It is preferable that it consists of a contact piece.

In addition, a guide protrusion is formed in one of the slide hole and the sleeve, and a guide groove in which the guide protrusion is accommodated is formed in one of the slide holes and the sleeve so as not to rotate the sleeve penetrated through the slide hole.

Finally, it is preferable that a plurality of position fixing protrusions are formed on both sides of the fixing bracket to prevent rotation in the fastening direction of the coupling bolt when coupled to the upper rail.

According to the gearbox for a vehicle seat slide of the present invention having the configuration as described above, the impact or static load strength test of the vehicle by forming an integrated gearbox through a structure in which the support cover and the support plate are coupled to the fixed bracket in an orthogonal state When the gearbox is prevented from twisting up, down, left and right, and the worm shaft and worm wheel nut are installed stably without cumulative tolerance, there is an excellent effect of preventing noise.

In addition, by preventing the sliding of the seat by the locking unit during the front collision of the vehicle, the structural effect of the backward driving of the seat for life-saving is also excellent.

In addition, since the housing for supporting the worm shaft and the worm wheel nut is not required as in the related art, the assembly structure is improved by omitting the number of parts, and the cumulative tolerance between the parts is minimized, thereby improving durability.

In addition, there is also a structural effect by preventing the noise due to the operation by forming a fixing protrusion on the fixed bracket, to be fastened without twisting when the upper rail of the bracket is fastened.

1 is a perspective view showing a bracket of a conventional gearbox,

Figure 2 is a photograph showing a modified state of the housing and the bracket of the conventional gearbox,

3 is a perspective view showing a state in which a gear box according to the present invention is installed on a lead screw,

Figure 4 is an exploded perspective view of the present invention gearbox exploded,

Figure 5 is a perspective view of only one side open state in the engaged state of Figure 4,

6 is a cross-sectional view of main parts of FIG.

7 is an exploded perspective view illustrating the locking unit of the present invention in a gear box disassembled,

8 to 10 is a functional diagram showing the operating state of the locking unit of the gearbox of the present invention.

Figure 3 is a perspective view showing a state in which the gear box according to the present invention is installed on the lead screw, Figure 4 is an exploded perspective view of the present invention the gear box exploded, Figure 5 is an exploded view of only one side open in the engaged state of Figure 4 6 is an exploded perspective view illustrating a main part of the gearbox of the present invention, and FIG. 7 is an exploded perspective view of the locking unit of the present invention. FIG. 8 to FIG. to be.

3 to 10, the gearbox 600 for a vehicle seat slide of the present invention is coupled to the upper rail (L) having a seat, the depression 110 having both sides open to the central portion in the longitudinal direction. Fixed bracket 100 having; A worm shaft 210 and a worm wheel nut 230 rotatably installed in an orthogonal state inside the recess 110 of the fixing bracket 100; A pair of support covers 300 coupled to both sides of the recess 110 of the fixing bracket 100 and rotatably supporting the worm shaft 210; A pair of support plates 400 rotatably supporting the worm wheel nut 230 are installed in the recess 110 to be perpendicular to the support cover 300 and through the slide bush 430 slidably disposed. ); And installed in the recess 110 to be spaced apart from the lead screw (S) in a state adjacent to the slide bush (430), when the impact load occurs by the slide screw (430) and the lead screw (S) and Locked unit 500 that is locked to block the movement of the gearbox 600; is configured to include.

Prior to the description, the gearbox 600 of the present invention is a drive device (not shown) disposed between the upper rail (L) in a state coupled to each of the pair of upper rail (L) provided on the lower portion of the seat of the vehicle. While driving by moving the upper rail (L) to make the movement of the sheet.

The gear box 600 is installed to be movable on a lead screw S fixed to a lower rail (not shown) of the vehicle body bottom. Hereinafter, since the structure except for the gearbox 600 of the present invention is a general matter, description thereof will be omitted.

In addition, since the gearbox 600 is coupled to the pair of upper rails L in the same structure, only one structure will be described.

The gear box 600 maintains the shape of a square as shown in Figure 3, the lead screw (S) is disposed in the inner lower side of the upper rail (L) is fastened to the fixing bracket 100 to be described later Two coupling bolts (B) to form a coupling with the upper rail (L).

The drive shaft 10 of the driving device (not shown) coupled with the worm shaft 210 installed inside the gearbox 600 is inserted in the right side of the drawing of the gearbox 600.

Hereinafter, the structure of the gearbox 600 will be described.

3 to 10, the gear box 600, the fixing bracket 100, the worm shaft 210 and the worm wheel nut 230, the support cover 300, the support plate 400, the locking unit 500 )

The fixing bracket 100 forms a coupling with the upper rail (L) having a seat, so that the gearbox 600 rides the lead screw S by the worm shaft 210 and the worm wheel nut 230. Let's move right.

The fixing bracket 100 maintains a predetermined length along the upper rail (L), and the depression 110 having both sides open at the central portion in the longitudinal direction is formed.

Recess 110 is formed of a horizontal frame 130 connecting a pair of vertical frame 120 and the vertical frame 120, the upper end of the vertical frame 120 is extended in an extension frame (bending in the longitudinal direction ( 140 is formed, the extension frame 140 is formed with a fastening hole 141 is fastened to the coupling bolt (B) for coupling with the upper rail (L).

Since the fixing bracket 100 having the shape as described above does not form the escape hole at the lower side of the recess 110, that is, the horizontal frame 130 as in the related art, the mechanical strength against the applied load is reinforced, thereby preventing distortion.

In addition, on both sides of the fixing bracket 100, that is, each upper surface of the extension frame 140, two fixing brackets 100 are prevented from rotating in the fastening direction of the coupling bolt B when the fixing bracket 100 is coupled to the upper rail L. The position fixing protrusion 150 is formed to protrude upward.

At this time, it will be apparent that the upper rail L is formed with two insertion holes (not shown) into which the position fixing protrusion 150 can be inserted.

These two position fixing protrusions 150, since the fixing bracket 100 is first inserted into the insertion hole when the fixing bracket 100 is coupled to the upper rail (L), and thus sets the installation position of the fixing bracket 100, the fixing bracket 100 In the process of fastening the coupling bolt (B) is prevented from being rotated in the rotation direction of the coupling bolt (B).

In this case, as the fixing bracket 100 is elaborately installed on the upper rail L, unstable engagement of the worm shaft 210 and the worm wheel nut 230 due to the minute rotation of the fixing bracket 100 is resolved as in the conventional gear. Noise generated when the box 600 is driven is blocked at the source.

On the other hand, the pair of vertical frame 120 of the depression 110 is formed with a through hole 121 penetrating the vertical frame 120, as shown in Figures 4 and 6, any one of the through holes ( The left side of the figure is formed of a tapered hole 122 having an inclined surface toward the outside from the recess 110 so that the insertion portion 513 of the locking body 510 to be described later can be inserted.

The worm shaft 210 and the worm wheel nut 230 receive the driving force transmitted from the drive shaft 10 as shown in FIGS. 3 to 5 so that the gear box 600 can move on the lead screw S. Power).

The worm shaft 210 is disposed in the driving shaft 10 direction inside the recess 110 of the fixing bracket 100 and rotatably installed in a state coupled with the driving shaft 10. The worm wheel nut 230 is a worm It is rotatably installed in the direction orthogonal to the shaft 210.

Since the coupling structure of the worm shaft 210 and the worm wheel nut 230 is a general matter, description thereof will be omitted.

The support cover 300 maintains a plate-like shape having a predetermined thickness in a pair of symmetrical shapes, and the opening of the fixing bracket 100 recessed part 110 in a state facing each other as shown in FIGS. 3 to 5. Both sides of the worm shaft 210 are rotatably supported while blocking both sides thereof from the outside.

That is, the pair of support covers 300 are coupled in a state in which both sides of the recess 110 of the fixing bracket 100 are closed.

The support cover 300, the outer line is a vertical piece 310 coupled to close one side of the open depressions 110 of the fixing bracket 100 in a shape corresponding to the open shape of the depressions 110 and Composed of a horizontal piece 320 bent in a direction facing from the upper side of the vertical piece 310, the coupling hole in which one side of the worm shaft 210 is rotatably inserted in the upper side of the vertical piece (310) 313 is formed.

In this case, the support cover 300 preferably has a height that the upper surface of the horizontal piece 320 and the upper surface of the extension frame 140, which is when the fixing bracket 100 is coupled to the upper rail (L) By allowing the horizontal piece 320 to support the upper rail L, the upper rail positioned on the recess 110 by the load applied to prevent the separation between the horizontal piece 320 and the upper rail (L) ( This is to prevent the warpage of L) from occurring.

Then, the support cover 300 is coupled by the depression 110 and the interference fit of the fixing bracket 100.

In this case, a plurality of first fitting protrusions 311 is formed on any one of the depression 110 of the fixing bracket 100 and the vertical piece 310 of the support cover 300, and the first fitting protrusions are formed on the other. First fitting grooves 101 into which the 311 is fitted are formed.

The first fitting protrusion 311 and the coupling using the first fitting groove 101 allows the pair of support covers 300 to be firmly coupled to both sides of the recess 110 of the fixing bracket 100. .

In addition, after coupling of the first fitting protrusion 311 and the first fitting groove 101, welding or caulking may be made to the coupling portion to prevent the mutual separation.

In the present exemplary embodiment, three first fitting protrusions 311 are formed on the support cover 300, and three first fitting grooves 101 are formed on one open side of the recess 110, but The arrangement, shape and number of the one fitting protrusion 311 and the first fitting groove 101 are not necessarily limited.

The support plate 400 maintains a rectangular shape on a plate having a predetermined thickness as a corresponding pair as shown in FIG. 4, and is supported in both directions of the support cover 300 coupled to face the inside of the depression 110. It is installed to be perpendicular to the cover 300.

In this case, the plurality of second fitting protrusions 410 protruding toward the support cover 300 are formed on both sides of the circumferential surface of the support plate 400 so that the support plate 400 may be installed orthogonal to the support cover 300. It is preferable that the second cover grooves 312 into which the second fitting protrusions 410 are inserted are formed in the support cover 300 in which the support plates 400 are orthogonal to each other.

That is, by the combination of the second fitting protrusion 410 and the second fitting groove 312, the two support plates 400 are installed in a state perpendicular to the two support covers 300 as shown in FIG. .

Then, after coupling of the second fitting protrusion 410 and the second fitting groove 312, welding or caulking may be made to the coupling portion in order to prevent separation from each other.

In this embodiment, the support cover 300 and the support plate 400 are maintained in a coupled state by the second fitting protrusion 410 and the second fitting groove 312, but may be coupled by various shapes of protrusions and grooves. It does not limit the coupling structure and shape because it can.

On the other hand, the plate surface of each support plate 400 is provided with a slide bush 430 for rotatably supporting the rotation axis of the worm wheel nut 230 disposed orthogonal to the worm shaft 210.

The slide bush 430 maintains a circular ring shape and is slidably disposed in a state of penetrating through the slide hole 420 formed in the support plate 400, and a rotation shaft of the worm wheel nut 230 is inserted therein. The hollow is formed so that it can be.

5 and 6, the slide bush 430 has a circular sleeve 431 penetrating the slide hole 420 of the support plate 400 in a state in which the rotation shaft of the worm wheel nut 230 is rotatably accommodated. The bending portion extends outward from the end of the sleeve 431 and includes a support plate 400 and a contact piece 435 adjacent to the locking unit 500 to be described later.

At this time, the sleeve 431 penetrated through the slide hole 420 is interlocked when the worm wheel nut 230 is rotated so that the rotation is not performed, and a plurality of guide protrusions are formed in any one of the slide hole 420 and the sleeve 431. 432 is formed, it is preferable that the other guide grooves 421 are formed to accommodate the guide protrusion 432 is formed.

The slide bush 430 as described above moves the locking unit 500 by sliding the slide hole 420 in a direction in which a load is applied in the front collision of the vehicle in a state adjacent to the locking unit 500 to be described later. 500 to be implemented (see FIGS. 8-10).

Although the guide protrusion 432 is formed in the sleeve 431 and the guide groove 421 is formed in the inner circumferential surface of the slide hole 420 in this embodiment, the guide protrusion 432 and the guide groove 421 It does not limit the position and shape.

Gear box 600 having the structure as described above, the fixing bracket 100 as two support cover 300 and the two support plate 400 is installed orthogonal to each other in the depression 110 of the fixed bracket 100. ), The support cover 300 and the support plate 400 to form an integrated state of interconnection.

In addition, since the support cover 300 and the support plate 400 maintain a completely fixed state, accurate installation of the worm shaft 210 and the worm wheel nut 230 is possible.

On the other hand, the recess 110 of the fixing bracket 100 is installed on one side of the support plate 400, that is, the locking unit 500 in the front direction of the vehicle.

The locking unit 500 is installed in the recess 110 of the fixing bracket 100 to be spaced apart from the lead screw S in a state adjacent to the slide bush 430 as shown in FIGS. 4 to 7, and the impact load of the vehicle is When generated, the lock screw 430 moves with the slide bush 430 in the load direction and locks with the screw thread of the lead screw S to block the movement of the gearbox 600, and the locking body 510, the return member 520, and the elastic ring. 530.

The locking body 510 is made up of a bisected pair each having a semicircular shape, and each of the locking bodies 510 is formed with a female screw thread engaged with a screw thread of the lead screw S, and the lead screw S is normally used. It is installed to be spaced apart from the lead screw (S) in the state (see Fig. 8).

As shown in FIGS. 6 and 7, the locking body 510 includes a semicircular flange 511 adjacent to the slide bush 430, and a flange 511 adjacent to the contact piece 435 of the slide bush 430. Insertion groove 512 formed along the radial direction so that the return member 520, which will be described later, can be inserted into the surface, and tapered from one surface of the flange 511, and an elastic ring 530, which will be described later, is fixed to the fixing bracket ( It is composed of an insertion portion 513, which is inserted into the tapered hole 122 formed in the depression 110 of the 100.

At this time, the tapered inclined surface of the insertion portion 513 is the same as the inclined surface formed in the tapered hole 122 of the fixing bracket 100 as shown in FIG.

The return member 520 is inserted into one side of the locking body 510, that is, the insertion groove 512 formed in the flange 511. The return member 520 connects the two locking bodies 510 that are divided into the lead screw (510). Elastically spaced apart from S).

At this time, the return member 520 is preferably a metal wire spring having a 'C' shape as shown in Figure 7, which is the return member 520 when the locking body 510 is engaged with the lead screw (S) This is to return the locking body 510 to the original position by the repulsive force when the engagement between the locking body 510 and the lead screw S is released by receiving the elasticity on the insertion groove 512.

The elastic ring 530 is provided on the other side of the locking body 510, that is, the outer surface of the insertion part 513 protruding from the flange 511, and is divided into two locking bodies 510 elastically connected by the return member 520. The elasticity of the return member 520 is always maintained by applying elasticity to the insertion portion 513 of the.

Here, the elastic ring 530 is preferably an O-ring shape made of a rubber material on the divided locking body 510.

The locking unit 500 having the above structure is normally spaced from the lead screw S by the return member 520 and the elastic ring 530 in the state where the insertion part 513 is inserted into the taper hole 122. While maintaining the state, while the vehicle collides with the lead screw (S) while moving in the load direction by taking the tapered hole 122 prevents the gearbox 600 from moving in the load direction.

In this embodiment, the locking unit 500 has been described as being provided on the front side (left side of the drawing) of the vehicle, but this is not necessarily limited because it may be provided on one side or both sides according to the specification or type of the vehicle. .

Unexplained reference numeral 440 is a spacer, when the locking unit 500 is provided only on one side is installed adjacent to the slide bush 430 of the other side serves to fill the empty space.

Hereinafter, a process in which the locking unit 500 provided in the gearbox 600 of the present invention will be described with reference to the accompanying drawings.

First, when a collision occurs forward while the vehicle is driving, the load acts in the direction of the arrow as shown in FIG. 8.

Before the load is applied, the locking unit 500 maintains a spaced state from the lead screw S as shown in FIG. 8.

Then, the inertia in the load direction acts on the seat-mounted upper rail L and the gearbox 600 by the generated collision load, and in this process, the slide bush 430 is leftward in the drawing of FIG. 9. Sliding by pushing the adjacent locking body 510 is moved.

The moving pair of locking body 510 is engaged with the thread of the lead screw (S) at any moment, as shown in Figure 9 while moving in the load direction on the tapered hole 122 by the slide bush 430. .

At this time, the elastic ring 530 is a pair of locking body 510 is engaged with the lead screw (L) while the pair of locking body 510 momentarily moves in the tapered hole 122 by inertia. Since the diameter of the momentarily decreases, as shown in FIG. 9, the surface of the locking body 510 rises to the circumferential surface of the flange 511.

In this case, the primary inertia acts between the worm wheel nut 230 and the lead screw S and at the same time, the locking unit 500 locks through engagement with the lead screw S, thereby moving the gearbox 600. It is to block, which in turn controls the movement of the sheet in the load direction.

In addition, as the movement of the gearbox 600 in the load direction is limited, the lead screw S of the opposite direction is not affected.

If, in case of emergency, the reverse drive of the seat for life should be made, if the upper rail L is moved slightly toward the front side (left side in the drawing), the locking body 510 and the slide are rotated by the rotation of the worm wheel nut 230. The gearbox 600 itself except for the bush 430 is moved.

In this process, the locking body 510 is spaced apart from the upper rail L by the repulsive force of the return member 520 while the tapered hole 122 of the fixing bracket 100 press-fitting the inserting portion 513 is separated. While placing the elastic ring in the initial position, the state becomes as shown in FIG. In this case, the sleeve 431 of the slide bush 430 is slid into the slide hole 420 of the support plate 400.

Then, when the upper rail (L) is reversed in the right direction on the drawing, since the backward movement of the seat is made with the gearbox 600 is made a life-saving structure easily.

Claims (10)

In the gear box 600 for automobile seat slide is installed on the upper rail (L) having a seat, It is coupled to the upper rail (L) having a sheet, the fixing bracket having a recess 110, both sides open in the longitudinal center portion; A worm shaft 210 and a worm wheel nut 230 rotatably installed in an orthogonal state inside the recess 110 of the fixing bracket 100; A pair of support covers 300 coupled to both sides of the recess 110 of the fixing bracket 100 and rotatably supporting the worm shaft 210; A pair of support plates 400 rotatably supporting the worm wheel nut 230 are installed in the recess 110 to be perpendicular to the support cover 300 and through the slide bush 430 slidably disposed. ); And It is installed on the recess 110 to be spaced apart from the lead screw (S) in a state adjacent to the slide bush 430, when the impact load is generated while moving by the slide bush 430 and locking with the lead screw (S) Gear box for a vehicle seat slide, characterized in that comprises a; locking unit 500 to block the movement of the gearbox 600. The method of claim 1, The locking unit 500, A pair of bisected locking bodies 510 which are installed to be spaced apart from the lead screw S while accommodating the lead screw S, and having a female screw thread engaged with the lead screw S therein; A return member 520 provided at one side of the locking body 510 and having an elasticity to connect the divided locking body 510 to be spaced apart from the lead screw S; And The locking body is provided on the other side of the locking body (510), the elastic ring for retaining the elasticity of the return member (520) (530). The method of claim 2, The locking body 510, A flange 511 adjacent to the slide bush 430; An insertion groove 512 formed along a radial direction to allow the return member 520 to be inserted into a surface of the flange 511 adjacent to the slide bush 430; And An insertion portion 513 that protrudes tapered from one surface of the flange 511 and is inserted into a taper hole 122 formed in the depression 110 of the fixing bracket 100 while the elastic ring 530 is fitted; Gear box for car seat slide, characterized in that consisting of. The method of claim 2, The return member 520 is a gear box for a car seat slide, characterized in that the wire spring of the 'C' shape. The method of claim 1, The support cover 300, the vertical piece 310 is formed with a coupling hole 313 is coupled to close one side of the open depression 110 of the fixing bracket 100, and the upper side of the vertical piece 310 Gearbox for a car seat slide, characterized in that consisting of a horizontal piece (320) bent extending in a direction facing from the. The method of claim 5, Recess 110 of the fixing bracket 100 and the support cover 300 is coupled by interference fit, A plurality of first fitting protrusions 311 are formed in any one of the recessed part 110 and the vertical piece 310, and the first fitting grooves 101 into which the first fitting protrusions 311 are fitted. Gear box for a car seat slide, characterized in that formed). The method of claim 1, A plurality of second fitting protrusions 410 are formed on the support plate 400 so that the support plate 400 may be installed to be orthogonal to the support cover 300, and the support cover 300 may include the first support protrusion 300. Gear box for a car seat slide, characterized in that the second fitting grooves (312) to which the two fitting protrusions (410) are fitted. The method of claim 1, The slide bush 430 may include a sleeve 431 penetrating the slide hole 420 of the support plate 400 in a state in which the rotation shaft of the worm wheel nut 230 is rotatably received, and the sleeve 431 of the sleeve 431. Gearbox for a car seat slide, characterized in that consisting of a contact piece (435) adjacent to the support plate 400 and the locking unit 500 is extended outward from the end. The method of claim 8, In order to prevent rotation of the sleeve 431 penetrating the slide hole 420, Car seat, characterized in that the guide protrusion 432 is formed in any one of the slide hole 420 and the sleeve 431, the guide groove 421 for receiving the guide protrusion 432 is formed in the other Gearbox for slide. The method of claim 1, Car seat slides, characterized in that formed on the both sides of the fixing bracket 100 is a plurality of position fixing projections 150 to prevent rotation in the coupling direction of the coupling bolt (B) when coupled to the upper rail (L). Gearbox.

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