KR20230090869A - Gear box with improved strength and, slide rail system for vehicles seat having the same - Google Patents

Abstract

The present invention relates to a gearbox with improved strength and a seat slide device having the same, the purpose of which is to prevent stress concentration on the upper part of the gearbox housing when a front load occurs due to a collision or collision of a vehicle, To provide a gearbox with improved strength capable of preventing damage or breakage of the gearbox housing and a seat slide device having the same.
The present invention relates to a gearbox installed in a vehicle seat slide device; The gearbox includes a worm shaft connected by a drive motor and a drive shaft; A worm wheel nut having one side meshed with the worm shaft and having a lead screw connected thereto; a gear box housing in which a worm shaft and a worm wheel nut are rotatably accommodated and insertion holes through which a lead screw is inserted pass through front and rear end surfaces; A mid-bracket in which the gearbox housing is accommodated and coupled to the seat, wherein the gearbox housing has an upper edge portion connected from the front/rear end surface to the upper end surface formed as an inclined surface having a predetermined inclination angle, so that the mid-bracket and It is configured so that a space portion (S) having an inverted triangular structure is formed between the front and rear end surfaces of the gearbox housing.

Description

Gear box with improved strength and, slide rail system for vehicles seat having the same}

The present invention relates to a gearbox with improved strength and a seat slide device having the same, and disperses the stress concentrated on the upper end of the gearbox housing when a front load is generated through the improvement of the structure and assembly structure of the gearbox housing. It relates to a gearbox with improved operability, stability and reliability, and a seat slide device having the same.

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.

The seat track is composed of a lower rail fixed to the floor panel and an upper rail coupled to be slidably moved along the lower rail and to which a seat cushion is connected, and the seat slide device is a driving means for sliding the upper rail and a gear box which slides the upper rail back and forth by rotating along the lead screw installed on the lower rail by a driving means.

The gear box is orthogonally installed inside so that the worm shaft and the worm wheel nut are engaged with each other, and when the worm shaft is rotated by the driving means, the worm wheel nut coupled to the lead screw is rotated, so that the gear along the lead screw The box is designed to slide back and forth.

In the conventional gearbox and seat slide device configured as described above, when a forward thrust is applied to the seat due to a car collision or collision accident, the load applied by the gearbox load is not dispersed, and the gearbox housing and mid-bracket A twisting phenomenon occurred, and a phenomenon was occurring that the gearbox housing was damaged.

In particular, the mid-bracket has an assembly hole for assembling the housing through which the assembly hole is formed, resulting in a decrease in strength. As a result, when a front load is generated, the mid-bracket is deformed and the gearbox housing is deformed. There was a problem that stress concentration occurred at the upper end of the.

In addition, the gearbox housing has a structure in which a pair of left and right housings are mutually coupled, and two bolt holes for assembling the pair of housings are provided on the upper and lower sides of the housing, respectively, so that the gearbox housing In addition to the decrease in strength, when the mid-bracket is deformed by the front load, damage and breakage of the gearbox housing are further aggravated.

In particular, the two lower bolt holes formed on the lower side of the housing are formed through the protrusion protruding on the lower side of the gearbox housing to be inserted into the assembly hole of the mid-bracket, so that the strength of the gearbox housing itself is very weak. , When a concentrated load is generated at the upper end of the gearbox housing due to deformation of the mid-bracket due to the generation of front load, damage occurs at the relatively weak lower end of the gearbox housing, that is, at the protrusion where the bolt sphere is formed. There was a problem.

Registered Patent Publication Registration No. 10-1803901 (2017.11.27) Registered Patent Publication Registration No. 10-2024526 (2019.09.18) Registered Patent Publication No. 10-1884186 (2018.07.26) Registered Patent Publication Registration No. 10-2277069 (2021.07.08)

An object of the present invention is to prevent the stress concentration on the upper part of the gearbox housing when a front load occurs due to a collision or collision of a car, and thus a gear with improved strength that can prevent damage or breakage of the gearbox housing. It is to provide a box and a seat slide device having the same.

The present invention relates to a gearbox installed in a vehicle seat slide device; The gearbox includes a worm shaft connected by a drive motor and a drive shaft; A worm wheel nut having one side meshed with the worm shaft and having a lead screw connected thereto; a gear box housing in which a worm shaft and a worm wheel nut are rotatably accommodated and insertion holes through which a lead screw is inserted pass through front and rear end surfaces; A mid-bracket in which the gearbox housing is accommodated and coupled to the seat, wherein the gearbox housing has an upper edge portion connected from the front/rear end surfaces to the upper end surface formed as an inclined surface having a predetermined inclination angle, so that the mid-bracket and It is configured so that a space portion (S) having an inverted triangular structure is formed between the front and rear end faces of the gearbox housing.

The present invention is made of an inclined surface having a predetermined inclination angle on the upper edge of the gearbox housing where the load concentration phenomenon occurs when a force that is directed forward to the seat due to a collision or collision accident of the car is applied, and the mid bracket and the gearbox The space part of the inverted triangle structure is formed between the upper edge of the housing, so that when the front load is applied, the deformation of the mid bracket is accommodated by the space part, avoiding concentrated load, and through this, the load is distributed to gear There is an effect of preventing damage to the box housing.

In the present invention, since the upper edge of the gearbox housing is made of an inclined surface, when the mid-bracket is deformed by a front load, the contact area between the mid-bracket and the gearbox housing is increased so that the load is distributed to the upper end of the gearbox housing. There is an effect of preventing the stress concentration phenomenon on.

The gearbox housing according to the present invention is designed so that the upper end is bolted and the lower end is snap-coupled by a fixing clip, so that the rigidity of the housing itself is increased by not forming the lower bolt hole, and the fixing clip is attached to the gearbox housing. Since it is installed while covering the lower end, there is an effect of increasing the strength of the gearbox housing itself due to a strong bonding force.

The present invention has an effect of reducing the thickness of the mid patch installed on the mid bracket because the strength is improved through the improvement of the structure and assembly structure of the gear box housing.

In the present invention, since a damper is installed between the mid-bracket and the gearbox housing, when a front load is applied, the load transmitted through the mid-bracket is buffered to prevent damage or damage to the gearbox housing.

In the present invention, the damper protrudes from the damper, the locking groove is formed on the gearbox housing, and the damper is installed on the front and rear end surfaces of the gearbox housing so that the locking projection of the damper is inserted into the locking groove of the gearbox housing. , The accumulated tolerance due to the assembly of the mid-bracket, damper and gearbox housing is minimized, and when a front load is applied, twisting and separation of the damper is prevented, and the thickness of the damper for the part equipped with a protrusion is increased to buffer the load. There are many effects such as further improvement.

1 is an exemplary view showing a configuration according to the present invention
Figure 2 is an exemplary view showing an assembly configuration according to the present invention
Figure 3 is an exemplary view showing a configuration on one side according to the present invention
4 is an exemplary view showing the configuration of a worm shaft according to the present invention;
5 is an exemplary view showing the configuration of a gearbox housing according to the present invention
Figure 6 is an exemplary view showing the detailed configuration of the gearbox housing according to the present invention
7 is an exemplary view showing the configuration of a damper according to the present invention
Figure 8 is an exemplary view showing the configuration of the seat slide device according to the present invention
Figure 9 is an exemplary view showing the front load strength analysis according to Example 1 of the present invention

1 is an exemplary view showing a configuration according to the present invention, Figure 2 is an exemplary view showing an assembly configuration according to the present invention, Figure 3 is an exemplary view showing one side configuration according to the present invention, Figure 4 is an exemplary view showing the configuration according to the present invention Figure 5 is an exemplary view showing the configuration of the gearbox housing according to the present invention, Figure 6 is an exemplary view showing the detailed configuration of the gearbox housing according to the present invention, Figure 7 shows an exemplary view showing the configuration of the damper according to the present invention,

The present invention relates to a gearbox installed in a vehicle seat slide device;

The gearbox 100,

A worm shaft 10 connected by a drive motor and a drive shaft;

A worm wheel nut 20 to which one side is meshed with the worm shaft 10 and to which the lead screw 200 is installed;

A gearbox housing in which the worm shaft 10 and the worm wheel nut 20 are rotatably accommodated and the insertion hole 35 through which the lead screw 200 is inserted passes through the front and rear end surfaces 30a and 30b (30);

A mid bracket 40 in which the gearbox housing 30 is accommodated and coupled to the seat; includes,

In the gearbox housing 30, the upper edge portion 31 connected from the front/rear end surfaces 30a and 30b to the upper surface 30c is formed as an inclined surface having a predetermined inclination angle, so that the mid bracket 40 and It is configured so that a space portion S having an inverted triangular structure is formed between the front and rear end faces 30a and 30b of the gearbox housing.

As shown in FIGS. 1 to 7, the worm shaft 10 has a screw thread 11 in which a drive shaft 310 connected to a drive motor 300 is axially coupled and one side is engaged with a worm wheel nut 20. And is rotatably installed in the installation space 32 of the gearbox housing 30.

In addition, as shown in FIGS. 1 and 4, the worm shaft 10 may be configured so that the support flanges 12 are integrally formed at both ends, and in this way, the support flanges 12 are integrally formed at both ends When the gearbox 100 is operated, when the support flange 12 is contacted and supported by the poly washer 13, the worm shaft 10 is rotationally driven in the installation space 32, so that the screw thread 11 is provided Stable rotation of the worm shaft 10 is achieved.

In addition, when the support flange 12 is integrally formed at both ends of the worm shaft 10, even if a load is generated in the front direction (F) or the rear direction (F`), the support flange 12 is attached to the poly washer 13 ) maintains a constant contact support state without play and pushing, so the worm shaft 10 not only operates stably, but also collides with the gearbox housing 30 due to the pushing of the worm shaft 10. However, there is an effect that the degradation of the durability of the gearbox housing 30 does not occur.

In addition, when the support flanges 12 are integrally formed at both ends of the worm shaft 10, stable rotation of the worm shaft 10 can be achieved without installing separate fixing bolts, thrust bearings, and washers to prevent loosening. In addition, a more compact structure can be designed by reducing the number of parts, the assemblability is improved, and the overall cost is reduced.

As shown in FIG. 1, the worm wheel nut 20 is rotatably installed in the installation space 32 of the gearbox housing 30 and is screwed to the lead screw 200 so as to move along the lead screw 200. It is coupled, and a screw thread 21 having one side meshed with the screw thread 11 of the worm shaft 10 is formed on the outer surface.

The worm shaft 10 and the worm wheel nut 20 are installed to rotate at right angles to each other in the installation space 32 of the gear box housing 30, and are connected by a drive shaft 300 connected to a drive motor (not shown). The worm shaft 10 and the worm wheel nut 20 are rotated and moved along the lead screw 200 .

Since the operation and connection relationship between the worm shaft 10 and the worm wheel nut 20 is well known, a detailed description thereof will be omitted.

As shown in FIGS. 1 to 3 and 5 to 6, the gearbox housing 30 has an installation space in which the worm shaft 10 and the worm wheel nut 20 are inserted and rotatably supported ( 32) is formed, and the upper edge portion 31 located in the front/rear end directions (F, F`) is formed as an inclined surface at a predetermined angle.

The installation space 32 includes a support hole 33 in which the worm shaft 10 is rotatably supported and a main hole 34 in which the worm wheel nut 20 is rotatably supported, and the main hole 34 ) is formed in communication with the insertion hole 35.

The upper edge portion 31 has a function to prevent stress concentration from being transmitted to the gearbox housing 30 due to deformation of the mid bracket 40 and an increase in contact area due to deformation of the mid bracket 40. It has a function of avoiding and distributing the load transmitted to the gearbox housing 30, and the function of the upper edge part 31 causes the seat to lean forward due to a car collision or collision accident. In this case, damage or breakage of the gearbox housing 30 is prevented.

That is, the upper edge portion 31 has a first upper edge 31a connected to the upper surface 30c from the front end surface 30a and a second upper edge connected to the upper surface 30c from the rear end surface 30b. It consists of an edge 31b, and the first upper edge 31a is made of an inclined surface formed to have a predetermined inclination angle in the rear direction F`, and the second upper edge 31b is formed in the front direction F. ), and an inverted triangular space (S) is formed between the mid-bracket 40 and the first and second upper edges 31a and 31b.

At this time, the upper corner portion 31 has a radius r and is perpendicular to the center line C passing through the midpoint of the insertion hole 35 formed in the front and rear end surfaces 30a and 30b of the gearbox housing. It consists of a slope having a predetermined inclination angle (θ) in the direction of the upper end surface (30c), with the starting point (P) at the point of about ⅓ (r) to 1.2 (r), preferably about ½ (r) to It may be made of an inclined surface having a predetermined inclination angle θ toward the upper end surface 30c with the point of 1.0 (r) as the starting point P.

That is, in the upper edge portion 31, the first upper edge 31a has an inclination angle of about 155 ° to 175 ° from the starting point P to the rear end direction F` based on the front surface 30a ( θ), preferably made of an inclined surface having an inclination angle (θ) of about 160 ° to 170 °, and the second upper edge 31b has a shear direction from the starting point (P) based on the rear end surface 30b ( F) may be made of an inclined surface having an inclination angle θ of about 155° to 175°, preferably about 160° to 170°.

Setting the starting point (P) as described above allows the connection of the lead screw 200 to be made stably through the insertion hole 35, so that the movement of the gearbox in the forward and end directions is smooth, as well as the insertion hole 35. In (35), a space portion (S) is formed in which the distance (width, W) from the mid bracket 40 to the upper edge portion 31 gradually widens in the direction of the upper surface 30c, so that the vehicle's Sufficient accommodation for the deformation of the mid-bracket 40 due to a collision or collision accident is made, and at the same time, the gear box is distributed by the load caused by simultaneous contact between the front/rear end surfaces 30a and 30b and the upper edge 35. This is to prevent stress concentration from occurring at the upper end of the housing 30.

That is, when the starting point (P) of the slope constituting the upper edge portion 31 is set to less than about ⅓ (r) point in the vertical direction with respect to the upper surface 30c from the center line (C) of the insertion hole, the upper edge portion Due to (31), the area of the insertion hole 35 through which the lead screw 200 is penetrated or screwed becomes small, so that when the gearbox 100 moves along the lead screw 200, play and torsion phenomena occur. Not only can occur, but also a phenomenon in which the operability of the gearbox 100 is lowered may occur.

In addition, when the starting point (P) of the slope constituting the upper edge portion 31 is set to be located above the point of about 1.2 (r) in the vertical direction from the center line (C) of the insertion hole, the gearbox housing 30 Stress concentration occurs at the upper end through the front/rear end surfaces 30a and 30b, and the gearbox housing 30 is damaged or damaged.

In addition, the gearbox housing 30 has boss portions 36 protruding from the front and rear end surfaces 30a and 30b, and an insertion hole 35 through which the lead screw 200 passes through the boss portion 36. ) may be provided, and when the boss portion 36 is provided on the front/rear end surfaces 30a and 30b in this way, the upper edge portion 31 is formed from the boss portion 36 to the upper surface 30c. It can be formed to be connected.

In addition, the gearbox housing 30 has a protruding portion 37 protruding from the bottom surface 30d, and the protruding portion 37 is assembled to be inserted into the assembly hole 41a of the mid bracket, and the lead screw 200 When the gearbox 100 is moved in the front and rear end directions (F, F`) along ), it has a function to prevent twisting or tilting of the gearbox 100 from occurring.

The gearbox housing 30 configured as described above is a pair of left/right housings, that is, first and second separately formed, so that the worm shaft 10 and the worm wheel nut 20 are assembled and installed in the installation space 32. It consists of a structure in which housings 30f and 30g are coupled, and the first housing 30f and the second housing 30g may be configured such that upper and lower ends are integrally assembled by fixing bolts 39, but FIG. As shown in FIGS. 1 to 3, the top is assembled by a fixing bolt 39, and the bottom is preferably configured to be assembled by snap coupling with a fixing clip 38.

That is, the gear box housing 30 has bolt spheres 30h formed through both sides so as to be symmetrical on both sides of the support hole 33 in which the worm shaft 10 is rotatably supported, and the bottom 30k of both sides ), a plurality of snap protrusions 30i are protruded, and the upper ends of the first and second housings 30f and 30g are integrally coupled by fastening the fixing bolt 39 through the bolt hole 30, and the snap protrusions The lower ends of the first and second housings 30f and 30g may be integrally coupled by one-touch coupling (snap coupling) between (30i) and the fixing clip 38.

At this time, the fixing clip 38 is in surface contact with the base clip 38a, which is in surface contact with the lower surface 30d of the gearbox housing, and the both side surfaces 30e of the gearbox housing, and the snap protrusion 30i is fitted and caught. It is formed to have a '∪'-shaped cross-sectional structure surrounding the lower part of the gearbox housing 30, including a flange clip 38b having a snap hole 38c coupled thereto. At this time, a clip through hole 38d through which the protrusion 37 of the gear box housing 30 is inserted is formed in the base clip 38a of the fixing clip.

In this way, the fixing clip 38 is assembled while wrapping the lower end surface 30d and the lower end 30k of both sides of the gearbox housing 30, so that the first and second housings 30f and 30g can be firmly coupled. In addition, the lower end is reinforced by assembling and installing the fixing clip 38, so that the overall strength of the gearbox housing 30 is improved.

In addition, when the gearbox housing 30 in which the worm shaft 10 and the worm wheel nut 20 are installed is assembled to the mid-bracket, the fixing clip 38 is installed between the gearbox housing 30 and the mid-bracket 40, that is, , Since it is installed in contact with the lower surface 30d of the gearbox housing and the central bracket 41 of the mid-bracket, there is an effect of further increasing the bonding force and strength of the first and second housings 30f and 30g.

In addition, as shown in FIGS. 1 to 3 , the gearbox housing 30 is formed so that the lower end 30k of both side surfaces on which the snap protrusion 30i is formed has a step difference with both side surfaces 30e, and the step difference is provided. The flange clip 38b of the fixing clip 38 may be installed in surface contact at the bottom 30k of both sides of the do.

At this time, the step difference between the both side surfaces 30e and the lower side 30k is the same as the thickness of the flange clip 38b, so that when the fixing clip 38 is mounted, both sides 30e and the fixing clip 38 of the gearbox housing ) It is preferable to be configured so that a step does not occur between the flange clips 38b.

In addition, when the first and second housings 30f and 30g are integrally assembled by the fixing bolt 39 and the fixing clip 38, assembly is easy and There is an effect of improving the assemblability. In particular, since the formation of the bolt sphere is reduced by ½ compared to the conventional gearbox, the decrease in strength of the gearbox housing 30 due to the formation of the bolt is prevented.

In addition, coupling protrusions 30m and coupling grooves 30n are further formed on one surface of the first and second housings 30f and 30g facing each other so that assembly can be performed quickly and accurately.

In addition, in the gearbox 100, as shown in FIGS. 1 to 3, a damper 50 may be further installed between the gearbox housing 30 and the mid bracket 40, and the damper 50 is made of a material having a predetermined elastic force, and is installed so that the gearbox housing 30 and the mid-bracket 40 do not come into direct contact, preventing play of the gearbox, preventing vibration and noise, and the mid-bracket It has a function of buffering and distributing the load transmitted through (40).

At this time, the damper 50 is installed such that one side is in surface contact with the side end bracket 42 of the mid-bracket and the other side is in surface contact with the front/rear end surfaces 30a and 30b of the gearbox housing 30, One side surface is in surface contact with the side end bracket 42 of the mid-bracket, and the other side surface is in surface contact with the front/rear end surfaces 30a and 30b of the gearbox housing 30 and a portion of the upper edge portion 31. there is. That is, the damper 50 may be installed so as not to be located in the space portion (S), or may be installed so that a part of the upper end is located on the space portion (S).

In addition, the damper 50, when the boss portion 36 is provided on the front / rear end surfaces 30a and 30b of the gearbox housing 30, as shown in FIG. 7, the boss portion 36 A coupling hole 51 into which is fitted is formed, and a through hole 52 communicating with the insertion hole 35 of the gearbox housing 30 is formed so as to have a step with the coupling hole 51.

In addition, when the damper 50 is installed such that a portion of the upper portion is positioned on the space portion S so as to come into contact with a portion of the upper edge portion 31 of the gear box housing 30, shown in FIGS. 2 and 7 As such, the locking protrusion 53 is further protruded at the upper end in contact with the upper corner portion 31, and the locking groove 31c into which the locking protrusion 53 is fitted is formed at a predetermined depth in the upper corner portion 31. It is formed to have, the front / rear end surfaces (30a, 30b) of the gearbox housing 30 by the double coupling of the coupling hole 51, the boss portion 36, and the locking protrusion 53 and the locking groove 31c It can be configured to be more firmly coupled to.

In addition, when the damper 50 further includes the locking protrusion 53, the damper thickness t from the side end bracket 42 of the mid bracket to the gearbox housing 30 becomes thicker, so that the mid bracket ( 40), the effect of buffering and dispersing the load transmitted to the gearbox housing 30 is further improved.

In addition, the damper 50 is formed so that the through hole 52 through which the lead screw 200 passes communicates with the insertion hole 35 of the gearbox housing 30.

As shown in FIGS. 1 to 3, the mid-bracket 40 includes a central bracket 41 in contact with the lower surface 30d of the gearbox housing or the base clip 38a of the fixing clip, and the central bracket ( 41), including side end brackets 42 formed vertically at both ends, and upper brackets 43 formed horizontally with the central bracket 41 at the upper end of the side end brackets 42 and fixed to the seat (not shown) side. And, it is formed by a pair of side end brackets 42 and a central bracket 41 to form a housing accommodating portion 44 in which the gearbox housing 30 is accommodated.

At this time, the central bracket 41 is provided with an assembly hole 41a into which the protrusion 37 of the gearbox housing is inserted, and the side end bracket 42 communicates with the insertion hole 35 of the gearbox housing to lead screw ( 200) is formed with a bracket hole 42a through which it is penetrated or screwed.

In addition, the mid-bracket 40 is formed so that one surface 43a of the upper bracket 43 contacting the seat side is higher than the upper surface 30c of the gearbox housing.

8 shows an exemplary view showing the configuration of a seat slide device according to the present invention, in the present invention, the driving force of a driving motor (not shown) is applied to the gearbox 100 fixed to the seat side through the driving shaft 300 In the seat slide device 800 in which the gearbox 100 is moved in the front and rear end directions (F, F`) along the lead screw 200;

The gearbox 100,

A worm shaft 10 connected by a drive motor and a drive shaft;

A worm wheel nut 20 to which one side is meshed with the worm shaft 10 and to which the lead screw 200 is installed;

A gearbox housing in which the worm shaft 10 and the worm wheel nut 20 are rotatably accommodated and the insertion hole 35 through which the lead screw 200 is inserted passes through the front and rear end surfaces 30a and 30b (30);

A mid bracket 40 in which the gearbox housing 30 is accommodated and coupled to the seat; includes,

In the gearbox housing 30, the upper edge portion 31 connected from the front/rear end surfaces 30a and 30b to the upper surface 30c is formed as an inclined surface having a predetermined inclination angle, so that the mid bracket 40 and It is configured so that a space portion S having an inverted triangular structure is formed between the front and rear end faces 30a and 30b of the gearbox housing.

Example 1

Figure 9 shows an exemplary view showing a gearbox front load strength analysis (at the time of 4,000 kgf load), (a) is a strength analysis for the structure of a conventional gearbox housing (applicant's product of the present invention), (b) is a strength analysis of the structure in which a chamfer is formed on the rear end boss of a conventional gearbox housing, and (c) is a strength analysis of the gearbox housing according to the present invention.

In the gearbox housing according to the present invention, the top edge is about 3 (r)/5 in the vertical direction from the center line (C) of the insertion hole with respect to the insertion hole radius (r) as the starting point (P), and the top surface direction It was based on being composed of inclined surfaces each having an inclination angle (θ) of about 165 °.

As shown in FIG. 9, when a load of about 4,000 kgf is applied from the rear to the front, it can be seen that stress concentration occurs at the top of the conventional gearbox housing (a), and the maximum strength is interpreted as about 3,500 to 3,600 kgf It became. In addition, it can be seen that the gearbox housing (b) with a chamfer formed on the rear end boss part also has a stress concentration phenomenon at the upper end, and the maximum strength is interpreted as about 3,800 to 3,900 kgf.

On the other hand, in the gearbox housing (c) according to the present invention, compared to (a) and (b), stress concentration on the upper part hardly occurred, and the maximum strength was interpreted as about 4,300 to 4,400 kgf Thus, it can be seen that the strength of the gearbox housing according to the present invention is improved.

Example 2

The actual strength according to the load from the rear to the front direction was tested with the gearbox mounted on the lead screw, and as a result, the conventional gearbox housing (Daewon Precision Industry, upper and lower bolt coupling) had a maximum strength of about 2,743 to 2,907 kgf. Damage occurred to the housing and mid-bracket.

In addition, in the case of a gearbox housing (without a lower bolt hole) in which the lower end is coupled by a fixing clip in the structure of a conventional gearbox housing (Daewon Precision Industry), damage to the body of the housing at a maximum strength of about 3,420 to 3,460kgf this has occurred

In addition, the gearbox housing according to the present invention (the upper end is bolted and the lower end is coupled by a fixing clip, and there is no lower bolt hole) is concentrated on the upper end of the housing by deformation of the mid bracket at a maximum strength of about 4,022 to 4,533 kgf Load was generated, but damage occurred in the relatively weak lower part, not the upper part where the load was concentrated.

The present invention is not limited to the specific preferred embodiments described above, and various modifications can be made by anyone skilled in the art without departing from the gist of the present invention claimed in the claims. Of course, such changes are within the scope of the claims.

In addition, the terminology described in the present invention is to distinguish one component from other components and aid understanding of the present invention, and the components of the present invention are not limited by the described terms.

(10): worm shaft (11,21): thread
(12): Support flange (13): Poly washer
(20): worm wheel nut (14,24): bearing
(23): washer (30): gearbox housing
(30a): front end (30b): rear end
(30c): top side (30d): bottom side
(30e): both sides (30f): first housing
(30g): 2nd housing (30h): bolt hole
(30i): snap protrusion (30k): bottom of both sides
(31): upper edge (31a): first upper edge
(31b): second upper edge (31c): locking groove
(32): installation space (33): support hole
(34): main hole (35): insertion hole
(36): boss part (37): protrusion part
(38): fixing clip (38a): base clip
(38b): Flange clip (38c): Snap hole
(38d): clip through hole (39): fixing bolt
(40): Mid Bracket (41): Center Bracket
(41a): assembly hole (42): side end bracket
(42a): bracket hole (43): upper bracket
(43a): one side (44): housing receiving part
(50): damper (51): coupling hole
(52): through hole (53): snag
(100): Gearbox (200): Leadscrew
300: drive shaft 800: seat slide device

Claims (6)

In the gear box installed in the vehicle seat slide device;
The gearbox,
A worm shaft 10 connected by a drive motor and a drive shaft;
A worm wheel nut 20 to which one side is meshed with the worm shaft 10 and to which the lead screw 200 is installed;
A gearbox housing in which the worm shaft 10 and the worm wheel nut 20 are rotatably accommodated and the insertion hole 35 through which the lead screw 200 is inserted passes through the front and rear end surfaces 30a and 30b (30);
A mid bracket 40 in which the gearbox housing 30 is accommodated and coupled to the seat; includes,
In the gearbox housing 30, the upper edge portion 31 connected from the front/rear end surfaces 30a and 30b to the upper surface 30c is formed as an inclined surface having a predetermined inclination angle, so that the mid bracket 40 and A gearbox with improved strength, characterized in that it is configured to form a space portion (S) of an inverted triangular structure between the front and rear end surfaces (30a, 30b) of the gearbox housing.
according to claim 1;
The upper edge portion 31 has a radius r and is ⅓ (r) in the vertical direction from the center line C passing through the midpoint of the insertion hole 35 formed in the front and rear end surfaces 30a and 30b of the gearbox housing. ) to 1.2 (r) as a starting point (P), a gearbox with improved strength, characterized in that it consists of an inclined surface having a predetermined inclination angle (θ) in the direction of the upper surface (30c).
according to claim 2;
The upper edge portion 31 includes a first upper edge 31a connected to the upper surface 30c from the front end surface 30a, and a second upper edge connected to the upper surface 30c from the rear end surface 30b ( 31b),
The first upper edge 31a is made of an inclined surface having an inclination angle θ of 155 ° to 175 ° from the starting point P to the rear end direction F` based on the front end surface 30a,
Strength, characterized in that the second upper edge (31b) is composed of an inclined surface having an inclination angle (θ) of 155 ° to 175 ° in the shear direction (F) from the starting point (P) based on the rear end surface (30b) improved gearbox.
according to claim 1;
The gearbox housing 30 has a structure in which the first and second housings 30f and 30g are coupled, and the first housing 30f and the second housing 30g are assembled at the top by a fixing bolt 39, , The bottom is assembled by snap coupling with the fixing clip 38,
The gear box housing 30 has bolt spheres 30h formed through both sides so that the worm shaft 10 is rotatably supported on both sides of the support hole 33 so as to be symmetrical to each other, and the lower end 30k of both sides A plurality of snap protrusions 30i are protrudingly formed,
The fixing clip 38 is in surface contact with the base clip 38a, which is in surface contact with the lower surface 30d of the gearbox housing, and the both side surfaces 30e of the gearbox housing, and the snap protrusion 30i is fitted and engaged. To include a flange clip 38b having a snap hole 38c formed therein,
By fastening the fixing bolt 39 through the bolt hole 30, the upper ends of the first and second housings 30f and 30g are integrally coupled, and the snap protrusion 30i and the snap hole 38c of the fixing clip 38 A gearbox with improved strength, characterized in that the lower ends of the first and second housings 30f and 30g are integrally coupled by a coupling (snap coupling) of ).
according to claim 4;
The gearbox housing 30 is formed so that the lower ends 30k of both sides on which the snap protrusions 30i are formed have a step with the both sides 30e, and the fixing clips 38 are attached to the lower ends 30k of both sides having the steps. A gearbox with improved strength, characterized in that the flange clip (38b) is installed to be in surface contact.
The driving force of the driving motor is transmitted to the gearbox 100 fixed to the seat side through the driving shaft 300, and the gearbox 100 moves in the front and rear directions (F, F`) along the lead screw 200. In the slide device 800;
The gearbox 100 is a seat slide device having a gearbox with improved strength, characterized in that made of the gearbox according to any one of claims 1 to 5.

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