JPS627854Y2 - - Google Patents

Description

Detailed Description of the Invention This invention relates to an improvement to a linear guide device in which rolling elements are interposed between two guide rails.

A linear motion guide device comprising two guide rails having rolling surfaces formed in the longitudinal direction, and a rolling element held in a plate-shaped cage and capable of rolling freely arranged between the rolling surfaces of the two guide rails. Since the relative movement between the guide rails is performed through the rolling of rolling elements, the relative movement resistance of the guide rails is extremely small, and the movement repeatability has the advantage of good stability, so it requires precision. Used as a guide element for XY moving tables, etc.

However, in such a linear motion guide device, the load of the moving table, etc. is supported through point contact or line contact of the rolling elements, so the support rigidity of the moving table is low, and the damping against vibration is particularly poor. Because of the low resistance, there is a drawback that the moving table vibrates when it stops rapidly and does not come to rest easily.

Therefore, in a moving platform device that requires positioning of the moving platform in a short time, it is necessary to install a friction mechanism or a viscous resistance reduction mechanism in addition to the linear motion guide device in order to damp the vibration of the moving platform. It was hot.

However, attaching such a friction mechanism or viscous resistance mechanism to the moving table has the disadvantage that the space required for the moving table apparatus increases and the manufacturing cost of the entire apparatus increases.

This idea was made in view of the above-mentioned drawbacks of the conventional technology, and its purpose was to provide an inexpensive linear motion guide device that has great vibration absorption properties and that can stop the movable platform in a short time during operation. There is a lot to offer.

In order to achieve this purpose, this invention has a number of rolling elements that bear the load between the rolling surfaces of two opposing guide rails, and a length slightly larger than the rolling elements, and A rolling element and a guide rail that support the load by having an elastically deformable cylindrical friction body that slightly presses the rolling surface by contacting the end surface with the surface and providing resistance through sliding contact with the guide rail when the guide rail moves relative to each other. The friction bodies that provide resistance to the friction elements are held in the pockets of a plate-shaped retainer so that they can roll freely.

Next, a first embodiment of this invention will be explained with reference to FIGS. 1 to 3.

The first guide rail 1 is a long block having a V-shaped groove 2 formed in the longitudinal direction on its side surface.

The second guide rail 3, like the first guide rail 1, is a long block with a V-shaped groove 4 formed on its side surface.

First guide rail 1 and second guide rail 3
is arranged such that V-shaped grooves 2 and 4 face each other, and between these V-shaped grooves 2 and 4, cylindrical rollers 5, which are rolling elements that support loads, are alternately arranged with their axes oriented at right angles. The cylindrical rollers 5 are sandwiched between the first guide rail 1 and the second guide rail 3 and are able to roll freely.

In addition, the V-shaped groove 2 of the first guide rail and the second
Between the V-shaped grooves 4 of the guide rail, a cylindrical friction body 6 with a diameter slightly larger than that of the cylindrical roller 5 and a length slightly larger than that of the cylindrical roller 5 is installed.
It is placed between.

The friction body 6 is made of an elastic material such as plastic, and is elastically deformed between the V-shaped grooves 2 and 4 so that the axial end surface of the friction body 6 slightly presses the V-shaped grooves 2 and 4. are doing. However, if the friction body 6 is a V-shaped groove 2,
4 is small, and most of the load applied to the guide rail when the linear motion guide device is used is supported by the cylindrical rollers 5, and the bearing of the load by the cylindrical rollers 5 is not hindered by the friction body 6.

The cage 7 is a thin plate member having a large number of elliptical holes 8 in the longitudinal direction, and in the elliptical holes 8 cylindrical rollers 5 or friction bodies 6 whose axes are alternately rotated in the right angle direction are rotated. The cylindrical rollers 5 or the friction bodies 6 are freely arranged, and are held in the cage 7 so as not to fall off by projections 9 provided at the long diameter ends of the oval holes 8 of the cage.

This retainer 7 is connected to the first guide rail 1 and the second guide rail 1.
It is disposed in a space facing the guide rail 3 and is movable in the longitudinal direction as the cylindrical rollers 5 roll.

In this embodiment, the friction body 6 has a cylindrical protrusion 10 on its end face so that the end face of the protrusion 10 comes into contact with the V-shaped grooves 2 and 4 of the guide rail, but the protrusion 10 has a trapezoidal shape. It's okay to let them do it. Note that the number of friction bodies 6 is determined in accordance with the usage conditions of the linear motion guide device.

The hole 11 provided in the first guide rail 1 and the hole 12 provided in the second guide rail 3 are bolt holes for mounting the guide rail.

First guide rail 1 and second guide rail 3
When there is a relative movement in the longitudinal direction, the V-shaped rolling groove 2,
The cylindrical rollers 5 and the friction body 6 held between the guide rails 4 roll and move by an amount equivalent to 1/2 of the relative movement of the guide rails. At this time, the protrusions 10 provided at the ends of the friction body 6 are in contact with the V-shaped rolling grooves 2 and 4 in a preloaded state, so a sliding frictional resistance that prevents rolling acts on the friction body 6. .

The linear motion guide device of this invention configured as described above has a rolling element that supports a load and a friction element that are rotatably disposed between two guide rails, and the end surface of the friction element slightly presses the rolling groove. As a result, the vibration between the guide rails can be damped by the sliding friction of the end face of the friction body, and there is almost no stay slip on the guide rails, so when used as a guide for a moving platform, etc., accurate operation cannot be achieved. Since it has good damping properties, it has the effect of shortening the stationary time even when the moving platform stops rapidly. Furthermore, since it is sufficient to simply incorporate a friction body into a conventional linear motion guide device, it is possible to provide a linear motion guide device with good performance at an extremely low cost.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a linear motion guide device according to the invention, FIG. 2 is a longitudinal sectional view of the linear motion guide device of FIG. 1, and FIG. 3 is a perspective view of a friction body. 1, 21...first guide rail, 3, 22...
...Second guide rail, 5...Cylindrical roller, 6,2
6...Friction body, 7, 27...Cage, 23...Ball.

Claims (1)

[Scope of utility model registration request] A first guide rail and a second guide rail each having a rolling surface formed of a V-shaped groove formed in the longitudinal direction, and a rolling surface between the first guide rail and the second guide rail. A large number of cylindrical rollers that are freely clamped to support a load, and a cylindrical body that is disposed between the cylindrical rollers and has a slightly larger length than the cylindrical rollers, and that is rollable and made of an elastic material such as plastic. a friction body; a plate-shaped retainer that holds the friction body and the cylindrical roller in a rotatable manner with the friction body and the cylindrical roller spaced apart from each other and the directions of their axes alternately changed at right angles; The rolling surface of the guide rail is pressed by the end surface of the friction body to apply frictional resistance to the first and second guide rails when the first and second guide rails move relative to each other. Linear motion guide device.