Vehicle seat sliding device

Abstract

The present invention provides a vehicle seat slide device that can suppress the separation of the upper rail from the lower rail during a collision, while keeping weight and manufacturing costs down. [Solution] The vehicle seat slide device 1 includes an upper rail 12. The upper rail 12 includes an upper rail body 122 and a reinforcing member 126. The reinforcing member 126 is a rectangular tube-shaped member with a cylindrical shaft arranged along the sliding direction, and is inserted into the internal space formed by the upper upper wall 122a and a pair of left and right upper side walls 122b of the upper rail body 122. The reinforcing member 126 is formed such that the reinforcing upper wall 126c follows the lower surface of the upper upper wall 122a, each of the left and right pair of reinforcing side walls 126b follows the respective inner surfaces of the upper side walls 122b, and the reinforcing bottom wall 126a extends in the opposing direction of the left and right pair of upper side walls at a point spaced downward from the upper upper wall 122a.

Description

【Technical Field】 【0001】 The present invention relates to a seat slide device for vehicles. 【Background Art】 【0002】 In vehicles such as automobiles, a seat slide device is provided to enable the seat to slide in the front-rear direction. Patent Document 1 discloses a seat slide device for vehicles. 【0003】 The seat slide device disclosed in Patent Document 1 includes a lower rail and an upper rail. The lower rail is integrally formed with a bottom wall fixed to the vehicle body floor, side walls extending upward from both side ends of the bottom wall, and a pair of upper walls extending substantially parallel to the bottom wall from the upper ends of the respective side walls. An opening is provided between the inner ends of the upper walls. 【0004】 The upper rail is integrally formed with an upper wall substantially parallel to the bottom wall of the lower rail and a pair of side walls extending downward from both side ends of the upper wall. A part of each side wall of the upper rail is inserted from the opening of the lower rail toward the bottom wall side. And roller shafts are pivotally supported on both side walls of the upper rail. 【0005】 In the seat slide device disclosed in Patent Document 1, there is a concern that the upper rail may separate from the lower rail during a vehicle collision. This will be specifically described with reference to FIG. 8. FIG. 8 is a schematic diagram showing the separation loads D1 and D3 applied to the upper rail when a vehicle in which a seat 900 is disposed via a seat slide device 901 on a vehicle body floor FL is in a front collision (the state shown in FIG. 8(a)) and a rear collision (the state shown in FIG. 8(b)). 【0006】 As shown in Figure 8(a), during a frontal collision, a load D2 is applied to the seat 900. This applies a load to the upper rail that causes it to separate from the lower rail, as indicated by the symbol D1. As shown in Figure 8(b), during a rearward collision, a load D4 is applied to the seat 900. This applies a load to the upper rail that causes it to separate from the lower rail, as indicated by the symbol D3. In this way, during a collision, the loads D1 and D3 that cause the upper rail to separate from the lower rail are applied to the upper rail, raising concerns that each side wall of the upper rail will deform by bending inward in the width direction, causing it to separate from the lower rail. 【0007】 Patent Document 2 discloses a structure that aims to suppress the separation of the upper rail from the lower rail during a collision as described above. In the seat slide device disclosed in Patent Document 2, a reinforcing member is housed inside the upper rail. The reinforcing member is a member having a U-shaped cross-section and is arranged along the upper wall and side wall of the upper rail, respectively. [Prior art documents] [Patent Documents] 【0008】 [Patent Document 1] Japanese Patent Publication No. 2004-142598 [Patent Document 2] Patent No. 6739802 [Overview of the Initiative] [Problems that the invention aims to solve] 【0009】 However, the seat slide device disclosed in Patent Document 2 is not considered sufficient to prevent the upper rail from separating from the lower rail during a collision. Specifically, although the seat slide device disclosed in Patent Document 2 has a reinforcing member housed inside the upper rail, making it less likely for the upper rail to separate than the seat slide device disclosed in Patent Document 1, it employs a U-shaped cross-section reinforcing member that follows the inner surface of the upper rail wall, so it is possible that both the side wall of the upper rail and the side wall of the reinforcing member will deform inward in the width direction. 【0010】 While measures such as increasing the thickness of the reinforcing members or using high-strength materials could be considered, these would lead to increased weight and manufacturing costs, making their adoption difficult. 【0011】 The present invention aims to solve the above-mentioned problems and provides a vehicle seat slide device that can suppress the separation of the upper rail from the lower rail during a collision while keeping the increase in weight and manufacturing costs down. [Means for solving the problem] 【0012】 A vehicle seat slide device according to one aspect of the present invention is a vehicle seat slide device that supports a seat in a slidable state on the floor of a vehicle body, comprising a member that is elongated in the sliding direction and fixed to the floor of the vehicle body, and comprising a lower bottom wall along the floor of the vehicle body, a pair of left and right lower side walls extending upward from both left and right ends of the lower bottom wall, and a pair of left and right lower upper walls extending from the upper ends of each lower side wall toward each other in the left and right direction along the lower bottom wall, with an upper wall opening provided between the pair of left and right lower upper walls in the left and right direction, and a lower rail that is slidable in the front and rear direction relative to the lower rail. The lower rail comprises an upper rail body, the upper rail being a member elongated in the sliding direction, to which the seat is fixed at the top, and having an upper wall along the vehicle floor, and a pair of left and right upper side walls extending downward from both left and right ends of the upper wall, with a portion of each of the pair of left and right upper side walls inserted into the lower rail through the opening between the upper walls; and a reinforcing member having a cylindrical shape with a cylindrical shaft arranged along the sliding direction, and disposed in the internal space formed by the upper wall of the upper rail body and the pair of left and right upper side walls. 【0013】 The vehicle seat slide device according to the above embodiment includes a cylindrical reinforcing member inserted into the internal space of the upper rail body, making it possible to achieve a higher section modulus of the reinforcing member than the structure of Patent Document 2, which employs a U-shaped cross-sectional reinforcing member. Therefore, the above vehicle seat slide device can suppress the separation of the upper rail from the lower rail during a collision more effectively than the structure of Patent Document 2, without increasing the thickness of the reinforcing member or using high-strength materials. 【0014】 In the above-described vehicle seat slide device, a portion of the cylindrical reinforcing member (reinforcing bottom wall) is formed to extend in the opposing direction of the upper side walls at a point where it is spaced downward from the upper wall. Therefore, even if a peeling load is applied during a vehicle collision, the reinforcing member can suppress the deformation of the upper side wall of the upper rail body inward in the left-right direction. In other words, even if the upper side wall tries to deform inward as described above due to the application of a peeling load during a vehicle collision, the reaction force from a portion of the reinforcing member (reinforcing bottom wall) can resist the deformation. In this respect as well, it is possible to suppress the separation of the upper rail from the lower rail during a collision more effectively than the structure of Patent Document 2, which employs a U-shaped cross-sectional reinforcing member. 【0015】 In the vehicle seat slide device according to the above embodiment, the reinforcing member may have a reinforcing bottom wall formed at a location spaced downward from the upper wall, so as to extend in the opposing direction between the pair of left and right upper side walls. 【0016】 The vehicle seat slide device according to the above embodiment has a cylindrical reinforcing member with a reinforcing bottom wall that extends in the direction opposite to the upper side walls. This makes it possible to suppress deformation of the upper rail body during a vehicle collision without excessively thickening the walls of the reinforcing member or forming the reinforcing member using high-strength materials. Therefore, by adopting the above configuration, increases in weight and manufacturing costs can be suppressed. 【0017】 In the vehicle seat sliding device according to the above embodiment, the reinforcing member may further have a reinforcing upper wall along the lower surface of the upper upper wall, and a pair of left and right reinforcing side walls extending downward from both left and right ends of the reinforcing upper wall along the inner surface of the upper side wall, and having a rectangular annular cross-sectional structure in a direction perpendicular to the sliding direction. 【0018】 The vehicle seat slide device according to the above embodiment has a reinforcing member with a rectangular annular cross-sectional structure, which is advantageous in suppressing deformation of the upper rail body during a vehicle collision compared to the case in which a reinforcing member with a wall portion that does not follow the wall portion of the upper rail body is used. 【0019】 In the vehicle seat slide device according to the above embodiment, the upper rail may further include a pair of left and right rollers that rotatably contact the upper surface of the lower bottom wall, and a roller shaft that pivotally supports the pair of left and right rollers, and each of the pair of left and right upper side walls has a hole or recess through which the roller shaft is inserted, and the reinforcing bottom wall is positioned at a height above the lower end of the roller shaft. 【0020】 In the above-described vehicle seat slide device, since the reinforcing member is positioned at a height above the lower end of the roller shaft, it is possible to prevent the reinforcing member from interfering with internal components (for example, bolts for fixing the lower rail to the vehicle floor) located in the space between the lower rail and the upper rail in the vertical direction. 【0021】 In the vehicle seat slide device according to the above embodiment, the reinforcing member may further have a pair of left and right reinforcing side walls extending upward from both left and right ends of the reinforcing lower wall along the inner surface of the upper side wall, each of the left and right pair of reinforcing side walls has a hole through which the roller shaft is inserted, and the roller shaft is fixed to each of the left and right pair of reinforcing side walls at the edge of the hole. 【0022】 In the vehicle seat slide device according to the above aspect, since the roller shaft is fixed to the edge of each hole of the reinforcing side wall, it is possible to suppress the transmission of the peeling load applied during a vehicle collision from the roller shaft to the upper rail body. That is, during a vehicle collision, a load is input to the roller shaft as well. However, in the above vehicle seat slide device, since the roller shaft is fixed to the edge of the hole in the reinforcing side wall, by dispersing the load input to the roller shaft to the reinforcing member, the load transmitted to the upper rail body can be reduced. Therefore, the above vehicle seat slide device can more effectively suppress the peeling of the upper rail from the lower rail during a vehicle collision. 【0023】 In the vehicle seat slide device according to the above aspect, the reinforcing bottom wall may adopt a configuration having an opening that allows the insertion of the roller shaft into the holes provided in each of the pair of left and right reinforcing side walls. 【0024】 In the vehicle seat slide device according to the above aspect, since an opening allowing the passage of the roller shaft is provided in the reinforcing bottom wall, the roller shaft can be easily assembled to the reinforcing member, and the manufacturing man-hours can be reduced. Therefore, the above vehicle seat slide device is advantageous for reducing the manufacturing cost. 【0025】 In the vehicle seat slide device according to the above aspect, the fixing of the roller shaft to each of the pair of left and right reinforcing side walls may adopt a configuration in which it is made by rigid joining. 【0026】 In the vehicle seat slide device according to the above aspect, since the roller shaft is fixed to the reinforcing side wall by rigid joining, the fixing of the roller shaft to the reinforcing member can be made strong. Therefore, the above vehicle seat slide device can suppress the roller shaft from detaching from the reinforcing member during a vehicle collision and more effectively suppress the deformation of the upper rail. 【0027】 In the vehicle seat sliding device according to the above embodiment, the reinforcing bottom wall may be configured to have a slit extending in the sliding direction. 【0028】 In the above-described vehicle seat slide device, since the reinforcing bottom wall has slits, it is possible to form a reinforcing member by winding one or more plates into a cylindrical shape. Therefore, it is possible to reduce the manufacturing cost of the member compared to when the reinforcing member is formed by extrusion or drawing. Moreover, in the above-described vehicle seat slide device, since the roller shaft is rigidly joined to the reinforcing side wall, high strength in the lateral direction of the reinforcing member can be ensured even if slits are provided in the reinforcing bottom wall. [Effects of the Invention] 【0029】 Each of the above embodiments of a vehicle seat slide device can suppress the separation of the upper rail from the lower rail during a collision while keeping the increase in weight and manufacturing costs down. [Brief explanation of the drawing] 【0030】 [Figure 1] This is a perspective view showing the external configuration of a vehicle seat slide device according to an embodiment. [Figure 2] A front view showing the configuration of the upper rail. [Figure 3] This is a bottom view of a portion of the upper rail, seen from below. [Figure 4] This is a perspective view showing the configuration of the reinforcing members. [Figure 5] This is a side view showing the configuration of the reinforcing member. [Figure 6] This is a front view showing the shaft fixed to the reinforcing member. [Figure 7] This is a cross-sectional view illustrating the effect achieved by providing a reinforcing member. [Figure 8]This is a schematic diagram illustrating the problems of a conventional vehicle seat slide device, where (a) shows the peeling load applied to the vehicle seat slide device during a frontal collision, and (b) shows the peeling load applied to the vehicle seat slide device during a rearward collision. [Modes for carrying out the invention] 【0031】 Embodiments of the present invention will be described below with reference to the drawings. The embodiments described below are illustrative examples of the present invention, and the present invention is not limited to these embodiments except for its essential configuration. 【0032】 Furthermore, in the following embodiments, a passenger car is used as an example of a vehicle. In the diagrams used in the following description, "FR" indicates the front of the vehicle, "RR" indicates the rear of the vehicle, "LH" indicates the left side of the vehicle, "RH" indicates the right side of the vehicle, "UP" indicates the top of the vehicle, and "LO" indicates the bottom of the vehicle. 【0033】 1. Outline configuration of the seat sliding device 1 for vehicles The schematic configuration of the vehicle seat slide device 1 according to this embodiment will be explained with reference to Figure 1. 【0034】 As shown in Figure 1, the vehicle seat sliding device 1 is a device that supports a seat in a slidable state on the floor of a passenger car (vehicle), and comprises a lower rail 11 and an upper rail 12. Note that the vehicle floor and seat are not shown in the attached figure. 【0035】 The lower rail 11 is a long member in the front-rear direction (sliding direction) and is fixed to the vehicle body floor (not shown). The lower rail 11 comprises a lower bottom wall 11a, a pair of left and right lower side walls 11b, and a pair of left and right lower upper walls 11c. The lower bottom wall 11a is fixed to the vehicle body floor and is a wall portion that follows the vehicle body floor. The pair of left and right lower side walls 11b are wall portions that extend upward from both the left and right ends of the lower bottom wall 11a. The pair of left and right lower upper walls 11c are wall portions that extend from the upper ends of each lower side wall 11b substantially parallel to the lower bottom wall 11a and extend toward each other in the left-right direction. In the left-right direction, the lower upper walls 11c are not connected to each other, and an upper wall opening 11d is provided between the left and right lower upper walls 11c. 【0036】 The upper rail 12 is a long member in the front-rear direction (sliding direction) and is slidably mounted relative to the lower rail 11 as indicated by arrow A. The upper rail 12 has a bracket 121 to which a seat is fixed at its upper part, and a portion of the upper rail 12 is inserted into the lower rail 11 through the opening 11d between the upper walls of the lower rail 11. 【0037】 2. Configuration of the upper rail 12 The configuration of the upper rail 12 will be explained using Figures 2 and 3. Note that the bracket 121 is not shown in Figures 2 and 3. 【0038】 As shown in Figures 2 and 3, the upper rail 12 comprises an upper rail body 122 made by bending a metal plate and a reinforcing member 126 made by bending a metal plate into a cylindrical shape. The upper rail 12 also comprises four rollers 124 (only two are shown in Figures 2 and 3) attached to the front and rear ends of the upper rail body 122, which is elongated in the front-rear direction, and two roller shafts 125 that pivotally support the pairs of rollers 124 on the left and right. 【0039】 As shown in Figure 2, the upper rail body 122 has an upper wall 122a that follows the vehicle floor and a pair of left and right upper side walls 122b that extend downward from both left and right ends of the upper wall 122a. The upper rail body 122 is integrally formed with the upper wall 122a and the pair of left and right upper side walls 122b, and when viewed from a direction perpendicular to the front-rear direction (sliding direction), it has a U-shaped cross-section with an inter-side wall opening 122c between the lower ends of the upper side walls 122b. 【0040】 The upper rail body 122 is located above the upper wall opening 11d of the lower rail 11, and a portion of the lower part of each of the pair of left and right upper side walls 122b is inserted into the lower rail 11 from the upper wall opening 11d. Note that the lower rail 11 is not shown in Figures 2 and 3. 【0041】 As shown in Figure 2, the reinforcing member 126 has a rectangular annular cross-sectional structure in a direction perpendicular to the front-rear direction (sliding direction), and as shown in Figure 3, it has a rectangular cylindrical shape formed so that the cylindrical axis is oriented in the front-rear direction (sliding direction). The reinforcing member 126 is positioned between the upper side walls 122b and is positioned spaced downward from the upper wall 122a. 【0042】 Each roller 124 is positioned so that a portion of it is located below the upper rail body 122 and is located outward in the left-right direction. As described above, the rollers 124 are pivotally supported on the roller shaft 125 so as to be able to rotate. 【0043】 The roller shaft 125 is fixed to the reinforcing member 126 and is inserted through holes (not shown) provided in each of the left and right upper side walls 122b. Alternatively, the upper side walls 122b may be provided with a recessed portion formed to extend inward from the lower end, through which the roller shaft 125 is inserted. 【0044】 Here, as shown in Figure 2, in the vehicle seat slide device 1 according to this embodiment, the reinforcing bottom wall 126a, which is the bottom wall of the reinforcing member 126, is positioned at a height above the lower end 125a of the roller shaft 125. 【0045】 3. Detailed structure of reinforcing member 126 The detailed structure of the reinforcing member 126 will be explained using Figures 4 and 5. Figure 4 is a perspective view showing the configuration of the reinforcing member 126, and Figure 5 is a side view from the left. 【0046】 As shown in Figure 4, the reinforcing member 126 has a rectangular annular cross-sectional structure and a rectangular cylindrical shape with a cylindrical axis arranged in the front-rear direction (sliding direction). The reinforcing member 126 is integrally formed with a reinforcing upper wall 126c arranged substantially parallel to the lower surface of the upper upper wall 122a (see Figure 2), a pair of left and right reinforcing side walls 126b extending downward from both left and right ends of the reinforcing upper wall 126c along the inner surface of the upper side wall 122b (see Figure 2), and a reinforcing bottom wall 126a connecting the lower ends of the left and right reinforcing side walls 126b. 【0047】 In the vehicle seat sliding device 1 according to this embodiment, the reinforcing member 126 is a member formed by bending a single metal plate into a rectangular tubular shape, and the reinforcing bottom wall 126a has a slit 126d extending in the front-rear direction (sliding direction). 【0048】 As shown in Figure 2, the reinforcing upper wall 126c is located below the upper upper wall 122a and is positioned along the lower surface of the upper upper wall 122a in a substantially parallel manner, either in contact with or separated from the lower surface of the upper upper wall 122a. Each reinforcing side wall 126b is positioned along the upper side wall 122b in a substantially parallel manner, either in contact with or close to the inner surface of the upper side wall 122b. The reinforcing bottom wall 126a is provided so as to extend in the opposing direction (left-right direction) between the left and right upper side walls 122b at a location close to the side wall opening 122c, which is spaced downward from the upper upper wall 122a. 【0049】 As shown in Figures 4 and 5, each reinforcing side wall 126b is provided with a hole 126e in the middle of its longitudinal direction through which a roller shaft 125 (see Figures 2 and 3) is inserted. The hole 126e is provided so as to be continuous with an opening 126f made in the reinforcing bottom wall 126a. That is, the reinforcing member 126 has a recessed portion consisting of the hole 126e and the opening 126f, and the roller shaft 125 is fixed to this recessed portion. 【0050】 4. Fixing structure of the roller shaft 125 to the reinforcing member 126 The fixing structure for the roller shaft 125 to the reinforcing member 126 will be explained using Figure 6 in addition to Figures 4 and 5. 【0051】 As described above, the reinforcing member 126 has holes 126e provided in each reinforcing side wall 126b so as to be continuous with the opening 126f made in the reinforcing bottom wall 126a. The roller shaft 125 is inserted from the opening 126f into the hole 126e, and the outer circumference of the roller shaft 125 is fixed at the edge of the hole 126e (fixed at the part indicated by reference numeral B). 【0052】 In the vehicle seat slide device 1 according to this embodiment, the roller shaft 125 is fixed to the reinforcing member 126 by rigid joining such as welding, for example. However, the method of fixing the roller shaft 125 to the reinforcing member 126 is not limited to this, and methods such as screw fastening or crimping can also be used. 【0053】 5. Effects achieved by providing the reinforcing member 126 The effect achieved by the vehicle seat sliding device 1 being equipped with a reinforcing member 126 will be explained with reference to Figure 7. 【0054】 As shown in Figure 7, during a vehicle collision, a peeling load is applied to the upper rail 12, causing a force to act on the lower end of each upper side wall 122b of the upper rail body 122, causing it to deform inward in the width direction (arrow C). 【0055】 In response to such a force, since there is an opening between the upper side walls 122b of the upper rail body 122 (there is an opening 122c between the side walls), the lower ends of the left and right upper side walls 122b tend to deform in a direction that brings them closer together. 【0056】 However, in the vehicle seat slide device 1 according to this embodiment, a structure is adopted in which a rectangular cylindrical reinforcing member 126 is inserted inside the upper rail body 122. Therefore, even if the upper side wall 122b tries to deform due to a force as shown by arrow C, the deformation is suppressed by the reinforcing member 126. In other words, in the vehicle seat slide device 1 according to this embodiment, instead of adopting a U-shaped reinforcing member along the upper upper wall and upper side wall of the upper rail body as in the structure of Patent Document 2, a cylindrical reinforcing member 126 has a reinforcing bottom wall 126a that extends in a direction opposite to the lower ends of the upper side walls 122b. As a result, the reinforcing bottom wall 126a of the reinforcing member 126 functions as a bolt against the force shown by arrow C, thereby resisting the input load. 【0057】 In Figure 7, the reinforcing upper wall 126c of the reinforcing member 126 is shown to be spaced downward from the upper upper wall 122a of the upper rail 12, but the reinforcing upper wall 126c and the upper upper wall 122a may be in contact with each other. 【0058】 6. Effects The vehicle seat slide device 1 according to this embodiment includes a cylindrical reinforcing member 126 inserted into the internal space of the upper rail body 122 (the space formed by the upper wall 122a and the pair of left and right upper side walls 122b). Therefore, it is possible to achieve a higher section modulus for the reinforcing member 126 than the structure of the above-mentioned Patent Document 2, which employs a U-shaped cross-sectional reinforcing member. Thus, the vehicle seat slide device 1 can suppress the separation of the upper rail 12 from the lower rail 11 during a collision more effectively than the structure of the above-mentioned Patent Document 2, without increasing the thickness of the reinforcing member 126 or using high-strength materials. 【0059】 Furthermore, in the vehicle seat slide device 1, the reinforcing member 126 is formed such that the reinforcing bottom wall 126a of the reinforcing member 126 extends in the opposing direction of the upper side walls 122b at a point where it is spaced downward from the upper wall 122a. Therefore, even if a peeling load is applied during a vehicle collision, the reinforcing member 126 functions as a latch that prevents the upper side walls 122b from moving closer together, thereby suppressing deformation of the lower end of the upper side wall 122b of the upper rail body 122 inward in the left-right direction. In other words, even if the lower end of the upper side walls 122b tries to deform in a direction that brings them closer together due to the application of a peeling load during a vehicle collision, the reaction force from the reinforcing bottom wall 126a of the reinforcing member 126 can resist the deformation. In this respect as well, it is possible to suppress the peeling of the upper rail 12 from the lower rail 11 during a collision more effectively than the structure of the above-mentioned Patent Document 2, which employs a U-shaped cross-section reinforcing member. 【0060】 Furthermore, the vehicle seat slide device 1 is designed so that the reinforcing bottom wall 126a of the cylindrical reinforcing member 126 extends in the opposing direction (left-right direction) between the upper side walls 122b. This allows for the suppression of deformation of the upper rail body 122 during a vehicle collision without excessively thickening the walls 126a to 126c of the reinforcing member 126 or using high-strength materials to form the reinforcing member 126. Therefore, by adopting the configuration of this embodiment, increases in weight and manufacturing costs can be suppressed. 【0061】 Furthermore, since the reinforcing member 126 of the vehicle seat slide device 1 has a rectangular annular cross-sectional structure, it is superior in suppressing deformation of the upper rail body 122 during a vehicle collision compared to using a reinforcing member that has wall portions that do not follow the wall portions 122a and 122b of the upper rail body 122. 【0062】 Furthermore, in the vehicle seat slide device 1, since the reinforcing member 126 is positioned at a height above the lower end 125a of the roller shaft 125, it is possible to prevent the reinforcing member 126 from interfering with internal components (for example, bolts for fixing the lower rail 11 to the vehicle floor) located in the space between the lower rail 11 and the upper rail 12 in the vertical direction. 【0063】 Furthermore, since the roller shaft 125 is fixed to the edge of the hole 126e in the reinforcing side wall 126b of the vehicle seat slide device 1, it is possible to suppress the transmission of the peeling load applied during a vehicle collision from the roller shaft 125 to the upper rail body 122. That is, during a vehicle collision, a load is also applied to the roller shaft 125, but in the vehicle seat slide device 1, since the roller shaft 125 is fixed to the edge of the hole 126e in the reinforcing side wall 126b, the load applied to the roller shaft 125 is distributed to the reinforcing member 126, thereby reducing the load transmitted to the upper rail body 122. Therefore, the vehicle seat slide device 1 can more effectively suppress the peeling of the upper rail 12 from the lower rail 11 during a vehicle collision. 【0064】 Furthermore, since the vehicle seat slide device 1 has an opening 126f in the reinforcing bottom wall 126a that allows the roller shaft 125 to pass through, the roller shaft 125 can be easily assembled to the reinforcing member 126, thereby reducing manufacturing man-hours. Therefore, the vehicle seat slide device 1 is advantageous in reducing manufacturing costs. 【0065】 Furthermore, since the roller shaft 125 of the vehicle seat slide device 1 is rigidly fixed (for example, by welding) to the edge of the hole 126e in the reinforcing side wall 126b, the fixing of the roller shaft 125 to the reinforcing member 126 can be made stronger. Therefore, the vehicle seat slide device 1 can suppress the roller shaft 125 from detaching from the reinforcing member 126 during a vehicle collision, and can more effectively suppress deformation of the upper rail body 122. 【0066】 Furthermore, since the reinforcing bottom wall 126a of the vehicle seat slide device 1 has a slit 126d, it is possible to form the reinforcing member 126 by winding one or more metal plates into a cylindrical shape. Therefore, it is possible to reduce the manufacturing cost of the member compared to when the reinforcing member 126 is formed by extrusion or drawing. Moreover, since the roller shaft 125 is rigidly joined to the edge of the hole 126e provided in the reinforcing side wall 126b of the vehicle seat slide device 1, even if the reinforcing bottom wall 126a has a slit 126d, the strength of the reinforcing member 126 in the left-right direction can be ensured to a high degree. 【0067】 As described above, the vehicle seat slide device 1 according to this embodiment can suppress the separation of the upper rail 12 from the lower rail 11 during a collision while keeping the increase in weight and manufacturing costs down. 【0068】 [Differentiation] In the above embodiment, a reinforcing member 126 having a quadrangular annular cross-sectional shape was used, but the present invention is not limited to this regarding the cross-sectional shape of the reinforcing member. For example, it is also possible to use a reinforcing member having a triangular annular cross-sectional shape or a pentagonal annular cross-sectional shape, or even a reinforcing member having a circular or elliptical annular cross-section. 【0069】 Furthermore, in the above embodiment, the height position of the reinforcing bottom wall 126a is set to be above the lower end 125a of the roller shaft 125, but the present invention is not limited thereto. It is also possible to set the height position of the reinforcing bottom wall to be approximately the same as the lower end of the roller shaft, or to set it to be below the lower end of the roller shaft. 【0070】 Furthermore, in the above embodiment, a hole 126e is made in the reinforcing side wall 126b of the reinforcing member 126 and the roller shaft 125 is inserted through the hole 126e, but the present invention is not limited thereto. For example, the roller shaft may be positioned so as to abut against the lower edge of the reinforcing side wall and the roller shaft may be fixed to the lower edge of the reinforcing side wall. 【0071】 Furthermore, in the above embodiment, an opening 126f continuous with the hole 126e is provided in the reinforcing bottom wall 126a, but the present invention is not limited thereto. For example, the opening continuous with the hole may not be provided in the reinforcing bottom wall, and the roller shaft may be inserted in the left-right direction (in the direction opposite to the reinforcing side walls). 【0072】 Furthermore, although the above embodiment employs a structure in which the reinforcing member 126 has a slit 126d extending in the front-rear direction, the present invention is not limited thereto. For example, it is also possible to form a reinforcing member with a closed cross-sectional structure that does not have a slit by forming the reinforcing member by extrusion or drawing. [Explanation of symbols] 【0073】 1. Vehicle seat sliding device 11 Lower Rail 11a Lower bottom wall 11b Lower side wall 11c Lower Upper Wall 11d Opening between upper walls 12 Upper Rail 122 Upper rail body 122a Upper Wall 122b Upper side wall 122c Opening between side walls 124 Rollers 125 Roller Shaft 126 Reinforcement member 126a Reinforced bottom wall 126b Reinforced side wall 126e hole

Claims

[Claim 1] A vehicle seat sliding device that supports a seat in a slidable state on the floor of a vehicle body, A lower rail comprising a member that is elongated in the sliding direction, fixed to the vehicle body floor, and comprising a lower bottom wall along the vehicle body floor, a pair of left and right lower side walls extending upward from both left and right ends of the lower bottom wall, and a pair of left and right lower upper walls extending from the upper ends of each lower side wall toward each other in the left and right direction along the lower bottom wall, wherein an upper wall opening is provided between the pair of left and right lower upper walls in the left and right direction, An upper rail is provided that is slidable in the front-rear direction relative to the lower rail, Equipped with, The aforementioned upper rail is An upper rail body comprising a member that is elongated in the sliding direction, to which the seat is fixed at the upper part, and having an upper wall that follows the vehicle floor, and a pair of left and right upper side walls that extend downward from both left and right ends of the upper wall, wherein a portion of each of the left and right pair of upper side walls is inserted into the lower rail through the opening between the upper walls, A cylindrical member having a cylindrical shaft arranged along the sliding direction, the reinforcing member being disposed in the internal space formed by the upper upper wall and the pair of left and right upper side walls of the upper rail body, Equipped with, A seat sliding device for vehicles. [Claim 2] The reinforcing member has a reinforcing bottom wall formed at a location spaced downward from the upper wall, so as to extend in the opposing direction between the pair of left and right upper side walls. A vehicle seat sliding device according to claim 1. [Claim 3] The reinforcing member further comprises a reinforcing upper wall along the lower surface of the upper upper wall, and a pair of left and right reinforcing side walls extending downward from both left and right ends of the reinforcing upper wall along the inner surface of the upper side wall, and has a rectangular annular cross-sectional structure in a direction perpendicular to the sliding direction. The vehicle seat sliding device according to claim 2. [Claim 4] The upper rail further comprises a pair of left and right rollers that rotatably contact the upper surface of the lower bottom wall, and a roller shaft that pivotally supports the pair of left and right rollers. Each of the pair of upper side walls has a hole or recess through which the roller shaft is inserted. The reinforcing bottom wall is positioned at a height above the lower end of the roller shaft. The vehicle seat sliding device according to claim 2. [Claim 5] The reinforcing member further comprises a pair of left and right reinforcing side walls that extend upward from both left and right ends of the reinforcing lower wall along the inner surface of the upper side wall, Each of the pair of reinforcing side walls has a hole through which the roller shaft is inserted. The roller shaft is fixed to each of the left and right reinforcing side walls at the edge of the hole. The vehicle seat sliding device according to claim 4. [Claim 6] The reinforcing bottom wall has openings that allow the roller shaft to be inserted into holes provided in each of the pair of left and right reinforcing side walls. The vehicle seat sliding device according to claim 5. [Claim 7] The roller shaft is fixed to each of the pair of left and right reinforcing side walls by a rigid joint. A vehicle seat sliding device according to claim 5 or claim 6. [Claim 8] The reinforcing bottom wall has a slit extending in the sliding direction, The vehicle seat sliding device according to claim 7.

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