JPS5919133Y2 - Linear guide device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement of a linear motion guide device in which rollers whose axis directions are alternately changed at right angles are sandwiched between two guide rails.

It has two guide rails each having a rolling element transfer groove with a V-shaped cross section in the axial direction, the rolling element transfer grooves of each guide rail are arranged to face each other, and the direction of the axis is alternately changed to a right angle direction. The linear motion guide device in which the rollers are held between the rolling grooves of the rolling elements has extremely low sliding resistance because the relative movement of the guide rail is performed by the transfer of the rollers. By using two sets as a pair and applying a preload, it is possible to support all the forces in the direction perpendicular to the guide direction of the slide table, so it has the advantage that the support of the slide table is confirmed, but this linear motion guide Since the rollers that support the load of the sliding table are elastic, the device has little damping against sliding, and when the sliding table is brought to a sudden stop from high-speed operation, the sliding table vibrates and the sliding The disadvantage is that it takes a long time for the table to come to rest.

For this reason, when a large number of positioning operations must be performed in a short period of time, even if you simply increase the moving speed of the slide table and shorten the travel time, the time it takes for the slide table to come to rest will increase, so precision cannot be achieved. The required positioning efficiency could not be improved.

In an attempt to improve the stability of such a sliding table when it is stationary, the preload force on the rollers is often increased more than necessary, but even if the preload force on the rollers is increased, the sliding table There is little improvement in stability when stationary, and if excessive preload force is applied, the life of the linear motion guide device will be shortened.

For this reason, conventionally, it has been common practice to improve the damping performance of the slide by attaching a friction mechanism or a viscous resistance mechanism to the slide in addition to the linear guide device that guides the slide.

However, attaching such a mechanism to the slide table requires space for installation and has the drawbacks of making the device complicated and expensive.

This invention was made in order to eliminate the above-mentioned drawbacks of linear motion guide devices using rollers. We are in the process of providing equipment.

In order to achieve this purpose, this invention provides a friction body that makes weak force contact with the guide surface of the guide rail that guides the end surface of the roller on the roller that is sandwiched between two guide rails and rolls. It has improved damping properties against vibrations.

Next, a first embodiment of this invention will be explained with reference to the drawings.

The first guide rail 1 has rolling element rolling grooves 2 with a V-shaped cross section formed on the side surface of a long rectangular member, and bolt holes 3 having counterbore holes formed on the top surface at predetermined intervals. It was drilled.

The second guide rail 4 is a long rectangular member having a rolling element transfer groove 5 having the same shape as the first guide rail 1, and bolt holes 6 having counterbore holes are provided at predetermined intervals on the lower surface. .

Between the rolling element transfer groove 2 of the first guide rail and the rolling element transfer groove 5 of the second guide rail, a large number of rollers 7a whose axis directions are alternately changed at right angles are arranged. .

The length dimension of the roller 7a is slightly smaller than the outer diameter dimension of the roller, and the roller 7a, which is held between the rolling element rolling groove 2 and the rolling element rolling groove 5, is connected to the first guide rail 1 and the second guide rail 1. When the guide rail 4 slides relative to each other, the rolling elements can be freely moved along the rolling grooves 2 and 5.

A through hole 8 is provided in the axial center of the roller 7a.
A friction body 9 made of an elastic material such as plastic is fitted into the through hole 8 .

This friction body 9 is a cylindrical member with a length slightly longer than the length of the roller 7a, and applies a weak force to the guide surface portion of the rolling element rolling grooves 2 and 5 of the guide rail that guides the end surface side of the roller 7a. The rollers 7a are pressurized and engaged to apply an allocation action to the rollers 7a.

The retainer 10 is a thin plate member in which roller retaining pocket holes 11 are provided in the same number as the rollers 7a.
The roller 7a is disposed in a space between the pocket hole 11 and the second guide rail 4, and the roller 7a is loosely fitted into the pocket hole 11 so as to be able to roll and rotate.

Next, another embodiment of the friction body provided on the roller will be described.

FIG. 3 shows a second embodiment, in which friction bodies 11 are loosely fitted into both ends of a through hole 8b of a roller 7b.
A spring 12 is interposed between 1.11 and 11.

The friction body 11 is caused to slightly protrude from the end surface of the roller 7b by a spring 12.

FIG. 4 shows a third embodiment, in which two friction bodies 13 are fitted into through holes 8C of rollers 7C, and the friction bodies 13 slightly protrude from the end surfaces of rollers 7C.

The friction body 13 is a ball made of plastic or a steel ball coated with an elastic body such as plastic.

FIG. 5 shows a fourth embodiment, in which two recesses 14 are provided back to back on the roller 7d, and a friction body 15 is loosely fitted into each of the recesses 14 via a disc spring 16. .

Also in this case, the friction body 15 slightly protrudes from the end surface of the roller 7d.

FIG. 6 shows a fifth embodiment, in which a circumferential groove 17 is provided on the end face of the roller 7e, and an annular friction body 18 is fitted into the circumferential groove 17.

The friction body 18 is made of an elastic body such as plastic, and slightly protrudes from the end surface of the roller 7e.

As shown in the above embodiments, the friction body 9.11.13°15
, 18 are all around 7a, 7b, 7C, 7d
.

Slightly protruding from the end face of roller 7e, rollers 7a, 7b,
The roller 7a is pressed with a weak force to come into contact with the guide surface that guides the end surfaces of the rollers 7C, 7d, and 7e.

Provides a damping effect on the motions of 7b, 7C, 7d, and 7e.

Since the friction bodies 11, 15 of the second and fourth embodiments have the springs 12 or 16 interposed therebetween, materials other than elastic bodies can also be used.

Further, the spring 12 or 16 may be an elastic body other than a metal spring.

The linear motion guide device of this invention constructed as described above has a friction body installed on the rollers to damp the vibrations of the rollers, so even when the sliding table is suddenly stopped, the vibration damping properties are good, and the rollers are particularly effective. Since vibration of the rollers is damped on the end face side, the linear motion guide device can be used for a long period of time without damaging the outer surface of the rollers, and has advantages such as being compact and inexpensive.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a linear motion guide device showing an embodiment of this invention, Fig. 2 is a cross-sectional view of Fig. 1, and Figs. 3 to 6 show rollers provided with friction bodies. This is another example. 1... First guide rail, 2, 5... Rolling element rolling groove, 4... Second guide rail, 7a,
7b. 7c, 7d, 7e...Roller, 8...Through hole, 9゜11, 13.15.18...Friction body, 10...Cage .

Claims (1)

[Scope of utility model registration request] It is held between two relatively movable guide rails,
A linear motion guide device comprising a roller having a through hole or a recess at its end, and a friction body that fits into the through hole or the recess of the roller and pressurizes and engages the guide rail.