JPH0242895Y2 - - Google Patents

Description

[Detailed description of the invention] - Industrial field of application The invention of the present application consists of a pair of raceways in which raceway grooves are formed in the longitudinal direction of a prismatic member, the raceway grooves facing each other, and a large number of rolling elements inserted between them. The present invention relates to a rolling bearing for linear motion that performs a finite linear motion, and particularly to a rolling bearing that is suitable for usage conditions such as stroke motion at relatively light loads and high speeds.

・Prior art A pair of raceway bases in which U-shaped grooves or V-shaped raceway grooves are formed in the longitudinal direction of a prismatic member, a large number of rolling elements, and a cage that arranges the rolling elements at equal intervals are used. Rolling bearings are widely used in sliding parts of electronic computers and their peripheral equipment, precision equipment such as die bonders and wire bonders, and machine tools such as tool grinders and super finishing machines. There is.

These bearings are often required to have high running performance on the μm level, and the motion is reciprocating, so when the number of strokes is high, the inertia of the rolling elements and cage becomes large, and the position of the way and cage increases. There was a problem that the relationship deviated and the repeat accuracy deteriorated.

Conventionally, a stopper attached to the end face of the way was used to prevent the retainer with rolling elements from flying out from the way, but this method caused severe collision between the retainer and the stopper, and this part This caused premature wear and shortened the life of the bearing.

・Problems to be solved The purpose of the present invention is to provide an inexpensive device that easily prevents misalignment between the track and retainer that occurs during high-speed reciprocating motion of a rolling bearing for finite linear motion.

- Means for solving the problems The present invention has the following configuration to solve these problems.

(1) A pair of raceways in which raceway grooves are formed in the longitudinal direction of the side surface of a prismatic member is arranged with the raceway grooves facing each other, and a flat retainer with a large number of rolling elements is inserted between the raceway grooves. In a rolling bearing for finite linear motion that linearly moves a way, a concave notch is formed in the end face along the raceway groove of the side surface where the raceway groove is formed, and the concave part of the retainer A rolling bearing for finite linear motion, wherein a spring portion is formed at a position corresponding to the notch so as to protrude so as to come into contact with the concave notch.

(2) The rolling bearing for finite linear motion according to item 1, wherein the recessed portion of the wayway is a substantially U-shaped recess formed over almost the entire length of the wayway in the longitudinal direction.

・Example The drawings in FIGS. 1 to 3 show an example of the invention of the present invention, and FIG. 4 shows the prior art that belongs to the technical field of the invention of the present application. FIG. 1 is a projected view showing an embodiment of the present invention, FIG. 2 is a projected view of only the track base shown in FIG. 1, FIG. 3 is a projected view showing the cage with rollers shown in FIG. FIG. 4 is a front view showing a conventional technique in which a pair of roller bearings for finite linear motion is used as a unit.

FIG. 4 shows a conventional roller bearing unit for finite linear motion. This figure shows roller bearings for finite linear motion fixed at corresponding positions on table T and bed B.

A conventional roller bearing for finite linear motion has cylindrical rollers 3 between the raceway grooves of a pair of raceway bases 1' in which V-shaped or approximately U-shaped raceway grooves are formed in the longitudinal direction of one side of a prismatic member. This is a cage in which cages 2' with cylindrical rollers arranged orthogonally to each other and arranged at equal intervals are inserted.

Some of these bearings use balls as rolling elements, and because of their simple structure, high running accuracy can be obtained. 'However, a phenomenon occurred where 3 slipped and shifted.

This displacement phenomenon causes the retainer 2' with cylindrical rollers to pop out from within the way base 1', causing severe wear on the stopper (not shown) attached to the end face of the way base 1' and the end face of the retainer 2'. There was a problem that the retainer 2' could be damaged.

FIG. 1 shows a first embodiment of the present invention. A raceway groove 1a is formed in the longitudinal direction of the track base 1, and a mounting hole 1c with a threaded portion 1d for fixing to another member is formed near the opposite side thereof.

On the surface where the raceway groove 1a is formed, a substantially U-shaped recessed part 1 is provided in the longitudinal direction on the lower end surface along the raceway groove 1a.
b is formed.

A cage 2 with cylindrical rollers arranged in a window 2c with the cylindrical rollers 3 orthogonal to each other and spaced apart from each other is inserted between the raceway grooves 1a of the track base 1.

A substantially S-shaped spring portion 2a is formed on a portion of the upper and lower end surfaces of the retainer 2 in the longitudinal direction, and the portion is processed to have an uneven surface on each track 1 side, and a protruding portion 2b of the spring portion 2a is formed. is in contact with the recessed part 1b of the track base 1.

Recessed portion 1b of track base 1 and spring portion 2a of retainer 2
Although various combinations of the relationship can be considered depending on the conditions of use, two to three examples are shown below.

During the stroke during use, the protrusion 2 of the retainer 2
The concave notch 1b shape of the track base 1 in contact with the raceway groove 1
If the spring force of the spring portion 2a of the retainer 2 is set to a slight force during use, and the spring force is gradually increased when a misalignment occurs, it is possible to In some cases, the sliding resistance can be kept the same as the conventional one.

In addition, if the usage conditions are severe and there is a high risk of slippage, an arc-shaped recessed part 1b may be added to the track base so that a spring force that gradually increases is generated in the spring part 2a of the retainer 2 during the usage stroke. It can also be formed.

FIG. 2 is a projected view of the track platform 1. The pair of tracks 1 are of the same shape, and one of them is used by inverting it. The recessed notch 1b formed on the side surface where the raceway groove 1a is formed is formed by a gentle circular arc and a straight line.

FIG. 3 is a projected view of the cage with cylindrical rollers of the present invention. A substantially S-shaped spring portion 2 a is formed on both end surfaces of the retainer 3 along the longitudinal direction by partially processing the portion, and comes into contact with the recessed notch portion 1 b of the track base 1 . In this embodiment, the shape of the spring portion 2a is two-dimensionally symmetrical both vertically and horizontally in a vertical plane in order to maintain balance, but it is not necessary to have the same shape, and it may be asymmetrical.

Further, although the retainer 2 and the spring portion 2a have an integral structure, it is also possible to form the retainer and the spring portion as separate members and integrate them by welding or the like.

The depth, width, and shape of the recessed portion 1b of the track 1, and the shape, material, and formation position of the spring portion 2a of the retainer 2 are matters to be appropriately designed depending on the usage conditions of the bearing.

As described above, the present invention has the recessed part 1b formed in the track base 1 and the spring part 2a formed in the retainer 2.
At least the retainer 2 and the track base 1 are brought into contact with each other.
However, when the raceway groove 1a and the rolling elements slip and become misaligned, the spring force of the spring portion is gradually increased to prevent the retainer 2 from popping out. It is not limited to the above, but may be anything that is stated in the scope of the claims for utility model registration.

· effect The present invention has the following effects.

Displacement due to slip between the track base and the retainer can be easily and reliably prevented.

It is only necessary to modify some parts of conventional bearing parts, and there is no need to change the mounting dimensions.

It is possible to prevent misalignment without installing the spring body outside the bearing, and it is inexpensive and easy to manufacture.

If the spring force is set so that almost no spring force acts when no misalignment occurs, the sliding resistance in normal conditions can be reduced.

[Brief explanation of the drawing]

The drawings in FIGS. 1 to 3 show an embodiment of the present invention, and FIG. 4 shows a prior art that belongs to the technical field of the present invention. FIG. 1 is a projected view showing an embodiment of the present invention, FIG. 2 is a projected view of only the track base shown in FIG. 1, FIG. 3 is a projected view showing the cage with rollers shown in FIG. FIG. 4 is a front view showing a conventional technique in which a unit is formed using a pair of rolling bearings for finite linear motion. 1: Raceway base, 1a: Raceway groove, 1b: Concave notch, 1
c: Mounting hole, 1d: Threaded part, 2: Cage, 2
a: Spring portion, 2b: Projection portion, 2c: Window, 3: Cylindrical roller.

Claims (1)

[Claims for Utility Model Registration] (1) A pair of raceways in which raceway grooves are formed in the longitudinal direction of the side surfaces of a prismatic member are arranged with the raceway grooves facing each other, and a flat plate with a large number of rolling elements is provided between the raceway grooves. In a rolling bearing for finite linear motion in which a retainer of the shape of a shape is inserted and a track is moved linearly, a concave notch is formed on the end face along the raceway groove of the side surface where the raceway groove is formed of the way. A rolling bearing for finite linear motion, characterized in that a spring portion is formed in the retainer at a position corresponding to the concave notch so as to protrude so as to come into contact with the concave notch. (2) The thin-walled utility model according to claim 1, wherein the recessed portion of the wayway is a substantially U-shaped recess formed over almost the entire length of the wayway in the longitudinal direction. Rolling bearing for linear motion.