JP7199792B1 - slide rail unit - Google Patents

Abstract

A slide rail unit is provided which has high load carrying capacity and durability, is easy to manage ball preload, and can reduce manufacturing costs. A guide groove surrounded by a base portion and a pair of side wall portions is formed in a channel shape, and each side wall portion has a rolling groove facing the guide groove in the longitudinal direction of the guide groove. and an inner rail having a rolling groove that moves in the guide groove of the outer rail along the longitudinal direction of the guide groove and faces the rolling groove of the outer rail. , and a large number of balls that roll while applying a load between the rolling groove of the outer rail and the rolling groove of the inner rail, the slide rail unit comprising: A mounting surface is formed along the longitudinal direction of the outer rail, and a recess is formed adjacent to the mounting surface, and a fixing bolt mounting hole opens in the recess. [Selection diagram] Fig. 1

Description

TECHNICAL FIELD The present invention relates to a slide rail unit for linearly moving an article within a predetermined range.

The slide rail unit has a plurality of balls arranged between an outer rail and an inner rail, and each of the outer rail and the inner rail is provided with rolling grooves for the balls along the longitudinal direction. . When the inner rail is pulled out in the longitudinal direction of the outer rail, the balls roll along the ball rolling groove while applying a load, so that the inner rail can be smoothly pulled out from the outer rail. . Also known is a so-called telescopic type slide rail unit in which an intermediate rail is arranged between the outer rail and the inner rail to lengthen the stroke of the inner rail with respect to the outer rail. Such slide rail units are used to support movable shelves and drawers in furniture made of wood or steel, to support internal equipment for housings of OA equipment such as multifunction machines, and to support linear guides in various industrial equipment such as machine tools. It is used in a wide variety of applications, such as the construction of departments.

As the outer rail and the inner rail, for example, as shown in Patent Document 1, those manufactured by bending a rolled steel plate and formed with the ball rolling grooves are mainly used. On the other hand, from the viewpoint of enhancing the load carrying capacity and durability of the slide rail unit, the cross-sectional shape of the outer rail or the inner rail is given to the bar material by drawing, the ball rolling groove is formed, and then quenching is performed. It is conceivable to harden the ball rolling grooves by heat treatment such as.

JP 2018-011628

However, if heat treatment is applied to the outer rail or inner rail formed by drawing, the outer rail or inner rail itself will be distorted due to the processing. The distance between the running groove and the ball rolling groove of the inner rail becomes uneven along the longitudinal direction thereof. For this reason, it is difficult to adjust the preload of the balls arranged in the ball rolling grooves, and the movement of the inner rail with respect to the outer rail becomes loose, or conversely, excessively large rolling resistance acts. I had concerns. If the rolling grooves are ground after the heat treatment, it becomes easier to adjust the preload of the balls during assembly, but there is a problem that the manufacturing cost increases accordingly.

Further, the slide rail unit is used by fixing the outer rail and the inner rail to the mounting surfaces of separate members (for example, a furniture body and its drawer). It is assumed that the outer rail or the inner rail fixed to the mounting surface will deform accordingly. That is, even if the amount of preload on the balls can be appropriately managed during manufacture, the movement of the inner rail relative to the outer rail may be loose depending on the environment in which the slide rail unit is actually used. There was a concern that an excessively large exercise resistance would act on the

The present invention has been made in view of such problems, and its object is to provide a slide having high load carrying capacity and durability, easy ball preload control, and reduced manufacturing costs. To provide a rail unit.

That is, the present invention has a guide groove surrounded by a base portion and a pair of side wall portions and is formed in a channel shape, and each side wall portion has a rolling groove facing the guide groove. an outer rail formed along the longitudinal direction, and an inner having a rolling groove that moves in the guide groove of the outer rail along the longitudinal direction of the guide groove and faces the rolling groove of the outer rail. A rail, a large number of balls rolling while applying a load between the rolling groove of the outer rail and the rolling groove of the inner rail, and the outer rail arranged in the guide groove of the outer rail. a retainer that is present in the gap between the inner rails and in which the plurality of balls are rotatably arranged; A mounting surface is formed on the mounting surface, and a recess is formed adjacent to the mounting surface, and a mounting hole for a fixing bolt opens in the recess.

According to the slide rail unit of the present invention, when the fixing bolt inserted through the bolt mounting hole of the outer rail is fastened to the mounting portion of the mechanical device or the like, by adjusting the tightening amount of the fixing bolt, the outer rail can be It is possible to arbitrarily change the interval between the pair of side walls in the . Therefore, even if the rolling groove that has been heat-treated after the drawing process is not ground, it is possible to easily manage the preload of the balls rolling in the rolling groove, and a high load is applied to the outer rail. Preload management and manufacturing costs can be reduced while providing load capacity and durability.

It is a perspective view showing an example of an embodiment of a slide rail unit of the present invention. FIG. 2 is a front view of the slide rail unit shown in FIG. 1; FIG. 5 is a cross-sectional view showing deformation of the outer rail due to attachment of the outer rail to the fixed portion; FIG. 5 is a diagram illustrating a method of managing clearances in the slide rail unit in the longitudinal direction of the outer rail; 10 shows another example of the method of attaching the outer rail to the fixed portion.

The slide rail unit of the present invention will be described in detail below with reference to the accompanying drawings.

1 and 2 show an example of a slide rail unit 1 to which the present invention is applied. FIG. 1 is a perspective view showing the overall appearance of the slide rail unit 1, and FIG. It is the front view observed from the direction.

As shown in these figures, the slide rail unit 1 is a combination of an outer rail 3 and an inner rail 4 via a large number of balls 2. The inner rail 4 is arranged in the longitudinal direction of the outer rail 3 The inner rail 4 can be freely moved to accommodate the inner rail 4 in the outer rail 3, or the inner rail 4 can be pulled out from the outer rail 3 as shown in FIG. For this reason, for example, by fixing the outer rail 3 to the fixed portion B of the mechanical device and the inner rail 4 to the movable portion of the mechanical device, the movable portion can be moved within a predetermined stroke range with respect to the fixed portion B. can be moved freely.

The outer rail 3 is a channel-shaped member having a guide groove 30 and has a base portion 31 and a pair of side wall portions 32 . The pair of side wall portions 32 are erected from the base portion 31 so as to sandwich the guide groove 30 , and each side wall portion 32 is perpendicular to the base portion 31 . The guide groove 30 functions as an accommodation space for the inner rail 4 . A rolling groove 33 for the ball 2 is formed in each side wall portion 32 so as to face the guide groove 30 . are set across. Further, the base portion 31 is provided with a mounting surface 34 that abuts on the fixed portion B of the mechanical device.

On the other hand, the inner rail 4 is a rod-shaped member accommodated in the guide groove 30 of the outer rail 3, and has a substantially rectangular cross section orthogonal to the longitudinal direction. In addition, the inner rail 4 is provided with a mounting surface 40 that abuts against the movable portion of the mechanical device. That is, it is provided outside the groove portion of the outer rail to prevent interference between the movable portion and the outer rail 3 . A rolling groove 41 for the ball 2 is formed on the wall surface of the inner rail 4 facing the side wall portion 32 of the outer rail 3 . The rolling groove 41 on the inner rail 4 side is formed at a position facing the rolling groove 33 on the outer rail 3 side. A large number of balls 2 are arranged between them.

Further, as shown in FIG. 2, the slide rail unit 1 is designed on the assumption that the outer rail 3 is mainly fixed to the wall surface SW of the fixed part B of the mechanical device, that is, the so-called wall attachment use. It is Therefore, the rolling groove 33 on the outer rail 3 side and the rolling groove 41 on the inner rail 4 side face each other in the width direction of the outer rail 3, that is, in the vertical direction of the paper surface of FIG. A vertical radial load acting along the wall surface SW can be efficiently applied. Each of the rolling grooves 33 and 41 has a circular arc-like cross section perpendicular to the longitudinal direction, and the radius of curvature is set larger than the radius of curvature of the spherical surface of the ball 2 .

Furthermore, a cage 5 is provided in the gap between the outer rail 3 and the inner rail 4 accommodated in the guide groove 30 of the outer rail 3 . The cage 5 is provided with a large number of accommodation holes having an inner diameter slightly larger than the diameter of the balls 2 at predetermined intervals. It is arranged between inner rails 4 .

Stoppers 6 are provided at the longitudinal ends of the outer rail 3 and the inner rail 4 to stop the movement of the cage 5. When the inner rail 4 is pulled out from the outer rail 3, the This prevents the cage 5 from getting out of the outer rail 3 or the inner rail 4. - 特許庁Theoretically, the cage 5 moves relative to the outer rail 3 by half the amount of movement of the inner rail 4 relative to the outer rail 3 . However, while the inner rail 4 repetitively reciprocates with respect to the outer rail 3 , the cage 5 may be displaced from the outer rail 3 . The stopper 6 is also used to reset the position of the cage 5 with respect to the outer rail 3 and the inner rail 4 when such positional deviation of the cage 5 occurs.

The outer rail 3 and the inner rail 4 are formed into the predetermined shapes described above by drawing a bar steel material. The rolling groove 33 of the outer rail 3 and the rolling groove 41 of the inner rail 4 are also formed by plastic deformation during drawing. In order to increase the load carrying capacity and durability of the rolling grooves 33 and 41, the outer rail 3 and the inner rail 4 formed by drawing are heat-treated.

FIG. 3 is a cross-sectional view showing a state in which the outer rail 3 is attached to the fixed portion B of the mechanical device. A plurality of mounting holes 35 for fixing bolts 7 are provided in the center of the base portion 31 of the outer rail 3 . The plurality of mounting holes 35 are provided at predetermined intervals along the longitudinal direction of the outer rail 3 . The outer rail 3 is fastened to the fixed portion B using a fixing bolt 7 inserted into the mounting hole 34 .

Further, a recess 36 is provided on the outside of the base portion 31 facing the fixed portion B. As shown in FIG. The recess 36 is provided at a position overlapping the bolt mounting hole 35 , and the bolt mounting hole 35 opens into the recess 36 . In this embodiment, since the bolt mounting hole 35 is provided at the center of the base portion 31 in the width direction, the recess 36 is also provided substantially at the center of the base portion 31 in the width direction. Accordingly, the recess 36 bisects the mounting surface 34 of the outer rail 3, and a pair of mounting surfaces 34 exist adjacent to both sides of the recess 36. As shown in FIG. Although it is sufficient if the recess 36 is partially provided in the base portion 31 corresponding to the opening position of the bolt mounting hole 35, the processing time of the recess 36 for the outer rail 3 is taken into consideration. In this case, there is no problem even if the recess 36 exists in the entire longitudinal direction of the outer rail 3 .

The outer rail 3 is in contact with the fixed portion B at the mounting surface 34, but is not in contact with the fixed portion B at the recess 36. is provided with a slight gap. Therefore, when the outer rail 3 is fastened to the fixed portion B using the fixing bolt 7, the base portion 31 is elastically deformed according to the tightening amount of the fixing bolt 7, and the tightening amount increases. Along with this, the pair of side wall portions 32 of the outer rail 3 tilts inward so as to narrow the guide groove 30 between the side wall portions 32 (in the direction of arrow A in FIG. 3). That is, it is possible to finely adjust the gap between the pair of side wall portions 32 according to the tightening amount of the fixing bolt 7 .

As shown in FIG. 2, each side wall portion 32 of the outer rail 3 is formed with a rolling groove 33 for the balls 2, while the inner rail 4 is formed with the rolling groove 33 of each side wall portion 32 facing the rolling groove 33. The rolling grooves 41 for the balls 2 are formed by the rolling grooves 33 on the outer rail 3 side and the rolling grooves 41 on the inner rail 4 side are opposed to each other along the width direction of the outer rails 3 . For this reason, if the distance between the pair of side wall portions 32 of the outer rail 3 is adjusted according to the tightening amount of the fixing bolt 7 as described above, the rolling groove 33 on the outer rail 3 side and the rolling groove 33 on the inner rail 4 side can be adjusted. By adjusting the interval between the running grooves 41, it becomes possible to adjust the degree of contact between the rolling grooves 33, 41 and the ball 2 rolling thereon.

As shown in FIG. 4, since a plurality of mounting holes 35 for the fixing bolts 7 are provided at predetermined intervals in the longitudinal direction of the outer rail 3, each fixing bolt 7 inserted into these mounting holes 35 can be By adjusting the tightening amount, it is possible to adjust the interval between the pair of side wall portions 32 of the outer rail 3 at the arrowed position in the figure. That is, the degree of contact of the balls 2 arranged between the outer rail 3 and the inner rail 4 with the rolling grooves 33 and 41 can be arbitrarily adjusted over substantially the entire length of the outer rail 3 .

When heat treatment is applied to the outer rail 3 and the inner rail 4 formed by drawing, heat treatment strain occurs in the outer rail 3 and the inner rail 4 according to their shape and thickness. Therefore, when the rolling grooves 33 and 41 are not ground after the heat treatment, the distance between the rolling groove 33 on the outer rail 3 side and the rolling groove 41 on the inner rail 4 side becomes It tends to be non-uniform, and it becomes difficult to adjust the preload of the balls 2 rolling on these rolling grooves 33 and 41 .

With regard to this point, according to the slide rail unit to which the present invention is applied, the tightening amount of each of the plurality of fixing bolts 7 that fasten the outer rail 3 to the fixing portion B can be individually adjusted. The distance between the rolling groove 33 and the rolling groove 41 can be adjusted by position. As a result, it is possible to adjust the distance between the rolling grooves 33 and 41 over the entire length of the outer rail 3, even when the rolling grooves 33 and 41 are not ground after the heat treatment. Even if there is, it is possible to easily manage the preload of the ball 2 .

In addition, the flatness of the fixed portion B for fixing the outer rail 3 and the movable portion for fixing the inner rail 4 is low, and the outer rail 3 or the inner rail 4 fixed there may be deformed following the flatness. Even in such a case, the rolling grooves 33 and the rolling grooves 41 can be adjusted over the entire length of the outer rail 3 by adjusting the tightening amount of the fixing bolt 7 that fastens the outer rail 3 to the fixing portion B as described above. can be adjusted, and the inner rail 4 can be smoothly moved with respect to the outer rail 3 .

Therefore, according to the slide rail unit of the present invention, it is possible to easily manage the preload of the balls without grinding the outer rail and the inner rail which have been heat-treated after the drawing process, and the manufacturing cost is reduced. It is possible to secure the motion accuracy of the inner rail with respect to the outer rail while suppressing the In addition, even when the flatness of the portions to which the outer rail and the inner rail are fixed is low, the preload amount of the balls can be readjusted after fixing the outer rail and the inner rail to the mechanical device. The movement of the inner rail 4 can be made smoother, and the degree of freedom in handling by the user can be increased.

FIG. 5 shows another example of the slide rail unit to which the present invention is applied. In the example shown in the figure, the recess is not directly formed in the base portion of the outer rail, but the plate member 8 is sandwiched between the fixed portion B and the base portion 31 to provide the above-mentioned forming a recess. In this example as well, the mounting hole 35 for the fixing bolt 7 provided in the base portion 32 of the outer rail 3 opens to the recess, and when the fixing bolt 7 is tightened, the base portion 35 is adjusted according to the amount of tightening. It is possible to finely adjust the distance between the pair of side wall portions 32 by elastically deforming the portion 32 .

Therefore, even in the example of FIG. 5, preload control of the ball 2 can be easily performed without grinding the outer rail 3 and the inner rail 4, and the inner rail 4 relative to the outer rail 3 can be easily controlled while suppressing the manufacturing cost. In addition, even if the flatness of the portion where the outer rail 3 and the inner rail 4 are fixed is low, the movement of the inner rail 4 with respect to the outer rail 3 can be made smooth. It becomes possible.

DESCRIPTION OF SYMBOLS 1... Slide rail unit 2... Ball 3... Outer rail 4... Inner rail 5... Cage 7... Fixing bolt 31... Base part 32... Side wall part 35... Bolt mounting hole 36... Recess

Claims (3)

It is formed in a channel shape having a guide groove surrounded by a base portion and a pair of side wall portions, and each side wall portion has a rolling groove facing the guide groove along the longitudinal direction of the guide groove. a formed outer rail;
an inner rail that moves in the guide groove of the outer rail along the longitudinal direction of the guide groove and has a rolling groove facing the rolling groove of the outer rail;
a large number of balls rolling while applying a load between the rolling groove of the outer rail and the rolling groove of the inner rail;
a cage disposed in the guide groove of the outer rail and present in a gap between the outer rail and the inner rail, in which the numerous balls are rotatably arranged;
with
The rolling grooves of the outer rail and the inner rail are formed in a circular arc shape with a radius of curvature larger than the radius of curvature of each ball spherical surface, and when the outer rail and the inner rail are drawn without grinding, formed,
A mounting surface is formed along the longitudinal direction of the outer rail on the base portion of the outer rail, and a recess is formed adjacent to the mounting surface, and a mounting hole for a fixing bolt is formed in the recess. A plurality of slide rail units are provided at predetermined intervals along the longitudinal direction of the outer rail . 2. The slide rail unit according to claim 1, wherein the recess formed in the base portion of the outer rail is formed by bringing a plate member into contact with the mounting surface. 3. The slide rail unit according to claim 1, wherein the base portion of the outer rail is fixed to the wall surface of the mechanical device using a fixing bolt inserted through the mounting hole.

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