JP2012013138A - Linear bearing device with guide rail height adjusting mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a linear bearing device for installing a guide rail horizontally at a low cost with high accuracy without increasing the height of the device.SOLUTION: In a linear bearing device comprising a slider and a guide rail, through holes penetrating through upper and lower surfaces of the guide rail and female thread sections are provided in the guide rail, and push bolts having a male thread section are screwed to the female thread sections. Upper surfaces of the push bolts are screwed in from the upper surface of the guide rail to thereby allow bottom faces of the push bolts to protrude from the lower surface of the guide rail and come into contact with a guide rail mounting surface. Thus, the height of the guide rail can be adjusted.

Description

  The present invention relates to a linear motion bearing device such as a linear guide device or a ball screw device used in a feeding mechanism of a machine device such as a manufacturing device, a machine tool, or a measuring device.

  Conventionally, as linear motion devices using rolling of a large number of rolling elements, there are linear motion guide bearings such as so-called linear guides and linear ball bearings, ball screw devices, etc., which are important machine elements of many industrial machines. in use. These linear motion devices are commonly required to have characteristics such as smooth and stable operability of rolling elements, low noise and long life. In order to meet these requirements, securing flatness over the entire guide rail is also a major factor, and when the surface accuracy of installing the guide rail of the linear motion device is not good, the flatness (levelness) of the guide rail is improved. Therefore, there is a problem that the level adjustment of the rail is necessary.

  As a prior art for improving this portion, there is Patent Document 1 (Japanese Patent Laid-Open No. 2-106505). As shown in FIG. 4, a guide (guide) rail 110 is supported by a carrier rail 116, and the carrier The carrier plate 120 penetrating the rail 116 in the direction perpendicular to the guide rail 110 is adjusted in height by the flange 130 of the jack screw 124. The height of the flange 130 is such that the “lower part 126 provided with the screw” of the jack screw 124 and the upper part of the jack body part 132 inserted by the insertion part 136 on the base plate 138 of the guide rail 110 to which the screw is to be screwed. An adjustment device has been proposed in which the guide rail 110 is adjusted to be substantially horizontal with respect to the reference level of the floor by adjusting the screw with the "threaded recess 134".

JP-A-2-106505

  However, in the conventional example described in Patent Document 1, since the level adjustment screw portions of a plurality of parts other than the guide rail are stacked, the height of the apparatus is increased and the cost is increased. There was also a problem of becoming higher.

  Therefore, the present invention has been made paying attention to the problems of the above-described conventional example, and by directly providing a screw hole for adjusting the leveling of the guide rail in the guide rail, the height of the apparatus is not increased and low. The purpose is to realize high-precision horizontal installation of guide rails at low cost.

  In order to solve the above-described problem, a linear motion bearing device according to claim 1 of the present invention includes a slider on which a load is mounted and a guide rail that guides a linear motion of the slider, and the guide rail includes the guide rail. It has a through hole penetrating the upper and lower surfaces of the rail, and a part of the length of the through hole is provided with a female screw portion concentric with the through hole.

  In order to solve the above-described problems, in the linear motion bearing device according to a second aspect of the present invention, in the configuration shown in the first aspect, the female screw portion provided on the guide rail has a separate male screw portion. The bottom surface of the push bolt protrudes from the bottom surface of the rail by tightening the top surface of the push bolt from the top surface side of the guide rail. The height of the guide rail is adjusted by bringing it into contact with the installation surface to be installed.

  According to the present invention, it is possible to horizontally install a guide rail with high accuracy at low cost without increasing the height of the apparatus. In addition, since it is not necessary to finish the mounting surface (installation surface side) with high accuracy, the cost of the entire apparatus can be reduced.

It is a figure which shows one Embodiment of the linear motion bearing apparatus with a guide rail height adjustment mechanism to which this invention is applied, (a) is a top view, (b) is a side view (a part of guide rail is sectional drawing). is there. It is the figure which laid the guide rail height adjustment mechanism of one Embodiment of this invention in the installation surface where surface accuracy is not good. It is the figure which expanded the A section of FIG. It is a figure which shows the level adjustment apparatus of the prior art rail.

  FIG. 1 shows an embodiment of a linear motion bearing device with a guide rail height adjusting mechanism to which the present invention is applied. In FIG. 1, the linear motion bearing device 1 of the present invention uses a roller or ball as a rolling element, and a slider 2 on which a heavy load composed of a known technique having a circulation path for the rolling elements is mounted. It is comprised with the guide rail 3 which has the height adjustment mechanism of this invention.

  The guide rail 3 has a counterbore (shoulder) for fixing the guide rail 3 with a bolt or the like from the guide rail upper surface 3a to the guide rail lower surface 3b, as in the conventional guide rail. Fixing holes 4 are provided at equal intervals. In the present invention, a level adjusting screw hole 5 for adjusting the horizontal plane of the guide rail is further provided at a substantially middle position of the hole of the guide rail fixing hole 4.

  As shown in FIG. 1B, the level adjusting screw hole 5 is a through hole from the guide rail upper surface 3a to the guide rail lower surface 3b, but a part of the lower portion of the through hole, that is, the guide rail. On the lower surface 3b side, a level adjusting screw portion 5a (female screw) having a smaller diameter than the hole diameter is provided on the guide rail upper surface 3a side. The reason why the entire range from the guide rail upper surface 3a to the guide rail lower surface 3b is not machined is that this female thread part is combined with a push bolt 7 (male thread) for adjusting the rail height, which will be described later, in the required screw axis direction. This is in order to eliminate the waste of the internal thread machining up to the unnecessary part while ensuring the mechanical strength. The shape and diameter of the level adjusting screw hole 5 may be appropriate for the tool used for adjusting the push bolt 7 from the guide rail upper surface 3a side.

  FIG. 2 shows an example in which the guide rail 3 with the guide rail height adjusting mechanism according to the embodiment of the present invention is laid on the installation surface 8 with poor surface accuracy. With reference to FIG. 2, an example of a procedure for attaching the guide rail 3 will be described. First, since the guide rail fixing holes 4 are set at equal intervals as described above, the guide rail fixing holes 8a that match the guide rail fixing bolts 6 at the pitch of the guide rail fixing holes 4 on the installation surface. (Hole with female thread) is processed vertically. Subsequently, in accordance with the position of the level adjusting screw hole 5 provided between the guide rail fixing holes 4, the horizontal plane having a size (area) about the maximum diameter of the level adjusting screw hole 5 can be secured on the installation surface 8. The push bolt counterbore portion 8b is processed to the limit depth.

  Then, the guide rail 3 is placed at a predetermined position of the installation surface 8 that has been subjected to holes and spot facings. First, the level of the upper surface of the guide rail is measured with a level or the like by using all the guide rail fixing bolts 6. The guide rail fixing bolt 6 is temporarily fixed while checking using a container. Subsequently, as shown in FIG. 3 which is an enlarged view of a part A in FIG. 2, the push bolt 7 is used to push the push bolt 7 from the guide rail upper surface 3a to the level adjusting screw hole 5 using a predetermined tool. Tighten as shown by the arrow to the point of contact with the counterbore 8b.

  After that, the entire guide rail is finally fixed so as to satisfy a predetermined horizontal reference while adjusting the tightening degree of the plurality of guide rail fixing bolts 6 and the plurality of push bolts 7 as a whole. Thus, in addition to the guide rail fixing bolt 6, a plurality of push bolts 7 are pressed against the installation surface 8, so that even when the guide rail 3 is laid on the installation surface 8 with poor surface accuracy, the guide rail 3 has a surface accuracy. It is possible to prevent or alleviate that the mounting surface becomes bad.

  Here, when the guide rail 3 is attached to the installation surface, the push bolt 7 is temporarily installed in the level adjusting screw hole 5 so that the push bolt bottom surface 7b is slightly retracted from the guide rail lower surface 3b. It goes without saying that you can go after you do this. The shape of the upper surface 7a of the push bolt for tightening and loosening the push bolt 7 may be a hexagonal hole generally used as the guide rail fixing bolt 6 or satisfy a predetermined tightening torque. Any type is acceptable.

  In addition, the shape of the tip end of the bottom surface of the push bolt 7b is generally a flat surface so that a counterbore portion 8b for the push bolt provided on the installation surface 8 is provided and appropriate surface pressure is provided to both of them. In the embodiment, such an example is given, but the present invention is not limited to this, and depending on the type and surface condition of the installation surface 8, the tip shape of the bottom surface of the push bolt 7b is selectively conical or hemispherical. It is also good.

  Furthermore, in FIG. 1 which is one embodiment of the present invention, one push bolt 7 is provided on a straight line in the middle portion of the guide rail 3 in the width direction in the middle portion of the plurality of guide rail fixing bolts 6. As an example, it is illustrated that the level adjusting screw hole 5 for incorporating the push bolt 7 is provided. However, the present invention is not limited to this. For example, in the middle portion of the two guide rail fixing bolts 6, For example, by arranging two push bolts 7 in a diagonal manner with a slight offset from the axial center of the guide rail 3 to both sides in the rail width direction, and individually adjusting the height at each location, It is expected that the horizontality in the width direction of the guide rail 3 is also improved at the same time.

DESCRIPTION OF SYMBOLS 1 Linear motion bearing device 2 Slider 3 Guide rail 3a Guide rail upper surface 3b Guide rail lower surface 4 Guide rail fixing hole 5 Level adjusting screw hole 5a Level adjusting screw part 6 Guide rail fixing bolt 7 Push bolt 7a Push bolt upper surface 7b Push bolt bottom face 8 Installation face 8a Guide rail fixing hole 8b Push bolt counterbore part 110 Guide rail 116 Carrier rail 120 Carrier plate 124 Jack screw 130 Flange 132 Jack trunk part 136 Insertion part 138 Foundation plate

Claims (2)

A slider for loading a load; and a guide rail for guiding a linear motion of the slider. The guide rail has a through-hole penetrating the upper surface and the lower surface of the guide rail. A linear motion bearing device characterized in that a female thread portion concentric with the through hole is provided in part. The female thread portion provided on the guide rail is screwed with a push bolt having a separate male thread portion, and the top surface of the push bolt is screwed in from the top surface side of the guide rail so that the bottom surface of the push bolt is the rail. The height of the guide rail is adjusted by bringing the bottom surface of the push bolt into contact with an installation surface on which the guide rail is installed. Linear motion bearing device.

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