JP4577285B2 - Temporary shaft of linear motion guide device - Google Patents

Description

  The present invention relates to a temporary shaft of a linear motion guide device, and in particular, is suitable for application as a countermeasure against lifting of a rail cover provided in the linear motion guide device when a bearing on the temporary shaft is mounted on a rail.

  In the linear motion guide device, as shown in FIG. 3, a long rail 11 and a bearing 12 are provided, and a rolling element rolling groove is formed in the rail 11 and the bearing 12 in parallel to the longitudinal direction of the rail 11. The rolling element is configured to advance while rolling in the rolling element rolling groove. And when this rolling element goes to one end of the bearing 12 body, it is scooped up at the tip of the end cap 13, and a circulation hole opened in the bearing 12 body through a return guide provided in the end cap 13. Led to. Then, when the rolling element comes out to the other end of the bearing 12 body through the circulation hole, the rolling element facing the rail 11 and the bearing 12 body through the return guide provided in the end cap 13 on the opposite side. Returning to the rolling groove, the rolling element can perform infinite circulation (Patent Document 1).

When the linear motion guide device configured as described above is used by being attached to a machine tool, a robot or the like, dust and dust accumulate on the rolling element rolling groove of the rail 11 and other exposed surfaces, thereby preventing the rolling element from rolling. Therefore, it is customary that the side seal 14 for dust protection is attached to the end cap 13.
Further, a mounting hole 19 is formed in the rail 11 so that the rail 11 can be fixed to a machine tool, a robot, or the like with a bolt. When dust or dust accumulates in the mounting hole 19, dust or dust adheres to the rolling element rolling groove in the bearing 12 when the bearing 12 passes through the upper part of the mounting hole 19, and smooth movement of the bearing 12 is achieved. Since it is obstructed, the metal rail cover 20 is attached to the upper surface of the rail 11 so that the upper part of the attachment hole 19 is blocked. Here, the rail cover 20 is bent in the width direction, and the bent portion of the rail cover 20 is configured to be hooked on the side surface of the rail 11.

Further, the bearing 12 and the end cap 13 have an inner side along the rolling element rolling groove in order to prevent dust and dust that has entered the bearing 12 beyond the side seal 14 from entering the rolling element rolling groove. A seal is formed. Then, before mounting the bearing 12 on the rail 11, in order to prevent the rolling element provided on the bearing 12 from falling from the rolling element rolling groove, the rail 11 is imitated as shown in FIG. The bearing 12 is held on the molded temporary shaft 30 made of resin. Then, as shown in FIG. 5, the temporary shaft 30 is disposed in the longitudinal direction of the rail 11, and the bearing 12 is mounted on the rail 11 by transferring the bearing 12 on the temporary shaft 30 onto the rail 11. it can.
JP 2005-83394 A

However, as shown in FIG. 6A, the side end 20a of the rail cover 20 attached to the linear motion guide device has a shape that rises obliquely, and the inner seal 12a provided on the bearing 12 is The rail cover 20 is configured to come into contact with the end surface of the rail cover 20 latched by the latching portion 11a of the rail 11 when entering the side end portion 20a of the rail cover 20.
For this reason, as shown in FIG. 6B, when the inner seal 12a comes into contact with the side end portion 20a of the rail cover 20, the inner seal 12a is in a state like the shape 12b. It is difficult to be in a state like the shape 12c that rides on the outer peripheral surface 20b.

As a result, when the bearing 12 is further pushed from the state in which the inner seal 12a is in contact with the side end portion 20a of the rail cover 20 (FIG. 7A), the inner seal 12a is pushed by the end face of the rail cover 20 and the rail. It deforms along the side end 20a of the cover 20 (FIG. 7B). When the bearing 12 is further pushed in, the amount of deformation of the inner seal 12a increases accordingly. When the inner seal 12a is deformed to some extent, the rail cover 20 is pushed up by the elastic force of the inner seal 12a at that time, and the rail cover 20 There was a problem of rising from 11 (FIG. 7C).
SUMMARY OF THE INVENTION An object of the present invention is to provide a temporary shaft for a linear guide apparatus capable of mounting a bearing on which an inner seal is formed on a rail while preventing the rail cover from floating from the rail.

  In order to solve the above-described problem, according to the temporary shaft of the linear motion guide device according to claim 1, the temporary shaft of the linear motion guide device that temporarily holds the bearing of the linear motion guide device, A protrusion is provided to protrude so as to abut on a side end of a rail cover configured to be hooked to a side surface of the rail and cover an upper surface of the rail.

  As described above, according to the present invention, by providing the temporary shaft with the protruding portion that protrudes so as to abut against the side end portion of the rail cover, the inner seal rides on the protruding portion, and on the temporary shaft. The bearing can be transferred onto the rail, and when the inner seal provided on the bearing enters the side end portion of the rail cover, the bearing contacts the end surface of the rail cover that is latched on the rail latching portion. The inner seal can be advanced to the outer peripheral surface of the rail cover while preventing. For this reason, when the bearing is mounted on the rail, the bearing can be prevented from being pushed in while the inner seal is pushed at the end surface of the rail cover, and the rail cover can be prevented from being lifted from the rail.

Hereinafter, a temporary shaft of a linear guide apparatus according to an embodiment of the present invention will be described with reference to the drawings.
FIG. 1A is a top view showing a schematic configuration of a temporary shaft of a linear guide apparatus according to an embodiment of the present invention, and FIG. 1B is a temporary shaft of a linear guide apparatus according to an embodiment of the present invention. FIG. 1C is a side view showing a schematic configuration of a temporary shaft of a linear motion guide device according to an embodiment of the present invention, and FIG. 1D is an embodiment of the present invention. It is a top view which shows schematic structure of the rail of the linear motion guide device which concerns.

  In FIG. 1, the rail 11 of the linear motion guide device is provided with a rail cover 20 configured to cover the upper surface of the rail 11 so as to be hooked on the side surface of the rail 11. Has a shape that is slanted up. Further, a protrusion 31 that protrudes in the axial direction is provided on the side surface of the temporary shaft 30 that temporarily holds the bearing of the linear motion guide device so as to abut on the side end of the rail cover 20. Here, the tip 31 a of the protrusion 31 can be shaped to be cut down obliquely so that it can be aligned with the side end of the rail cover 20. Moreover, it is preferable to make the thickness of the projection part 31 larger than the thickness of the rail cover 20, for example, it can set to 0.5 mm. Furthermore, a support portion 32 that positions the temporary shaft 30 so as to sandwich the side surface of the rail 11 from both sides is provided on the side surface of the lower end of the temporary shaft 30.

FIG. 2A is a top view showing a state where a bearing on a temporary shaft according to an embodiment of the present invention is mounted on a rail, and FIG. 2B is a schematic view of the temporary shaft according to an embodiment of the present invention. It is a side view which shows the state when mounting a bearing on a rail.
In FIG. 2, when the bearing 12 on the temporary shaft 30 is mounted on the rail 11, the temporary shaft 30 is arranged in the longitudinal direction of the rail 11, and the side surface of the rail 11 is sandwiched from both sides by the support portion 32. 30 is positioned, and the protrusion 31 abuts against the side end of the rail cover 20 while the protrusion 11 holds the rail 11 from both sides. The bearing 12 can be mounted on the rail 11 by transferring the bearing 12 on the temporary shaft 30 onto the rail 11.

  As a result, the bearing 12 on the temporary shaft 30 can be transferred onto the rail 11 while the inner seal of the bearing 12 rides on the protruding portion 31, and the inner seal provided on the bearing 12 is attached to the rail cover 20. The inner seal can be advanced to the outer peripheral surface of the rail cover 20 while preventing contact with the end surface of the rail cover 20 latched by the latching portion of the rail 11 when entering the side end portion. For this reason, when the bearing 12 is mounted on the rail 11, it is possible to prevent the bearing 12 from being pushed in while the inner seal is pushed on the end surface of the rail cover 20, and the rail cover 20 can be lifted from the rail 11. Can be prevented.

FIG. 1A is a top view showing a schematic configuration of a temporary shaft of a linear guide apparatus according to an embodiment of the present invention, and FIG. 1B is a temporary shaft of a linear guide apparatus according to an embodiment of the present invention. FIG. 1C is a side view showing a schematic configuration of a temporary shaft of a linear motion guide device according to an embodiment of the present invention, and FIG. 1D is an embodiment of the present invention. It is a top view which shows schematic structure of the rail of the linear guide device which concerns. FIG. 2A is a top view showing a state where a bearing on the temporary shaft according to one embodiment of the present invention is mounted on the rail, and FIG. 2B is a diagram on the temporary shaft according to one embodiment of the present invention. It is a side view which shows the state when mounting | wearing a rail with a bearing. It is a perspective view which shows schematic structure of a linear motion guide apparatus. It is a side view which shows the state when mounting the bearing on the conventional temporary shaft to a rail. 5A is a top view showing a schematic configuration of a conventional temporary shaft, FIG. 5B is a front view showing a schematic configuration of the conventional temporary shaft, and FIG. 5C shows a schematic configuration of the conventional temporary shaft. FIG. FIG. 6A is an enlarged side view showing the latching portion of the rail cover when the conventional bearing on the temporary shaft is mounted on the rail, and FIG. 6B shows the conventional bearing on the temporary shaft. It is sectional drawing which expands and shows the latching | locking part of a rail cover when attaching to a rail. It is a side view which shows the state when the inner seal of the bearing on the conventional temporary shaft passes the side edge part of the rail cover of a linear motion guide apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Rail 12 Bearing 13 End cap 14 Side seal 19 Mounting hole 20 Rail cover 21 Temporary shaft 31 Protrusion part 32 Support part

Claims (1)

In the temporary shaft of the linear motion guide device that temporarily holds the bearing of the linear motion guide device,
A straight portion characterized by comprising a protruding portion that protrudes so as to abut on a side end portion of a rail cover that is configured to be hooked to a side surface of the rail of the linear motion guide device and cover an upper surface of the rail. Temporary shaft of the motion guide device.

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