JPH08296640A - Ball bearing for linear motion - Google Patents

Abstract

PURPOSE: To surely fix a ball cage at the correct position by employing a folded projecting part which is formed by folding a regulating ring as a projecting part of the regulating ring, and providing a cut and erected projection which is formed by cutting and erecting a part of the regulating ring as a locking projection. CONSTITUTION: A regulating ring 9 is fitted to a recessed groove 7 of an outer cylinder 2. The regulating ring 9 is held by a projecting part 9a without being played in the recessed groove 7, and the regulating ring 9 is prevented from being turned relative to the outer cylinder 2 by a cut and erected projection 9b. Thus, the regulating ring 9 is not turned relative to the outer cylinder 2, and is not removed from the outer cylinder 2. Because the regulating ring 9 is not moved in the axial direction of the outer cylinder 2, or not played, a ball cage 3 is correctly positioned, and a ball bearing for the straight motion is provided where the correct and straight motion is achieved relative to the shaft 1, and its assembly is extremely simple.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a linear motion ball bearing.

[0002]

2. Description of the Related Art Conventionally, ball bearings for linear motion having the structure shown in FIGS. 1, 2 and 3, 4 have been proposed.

The ball bearings for linear motion shown in FIGS. 1, 2 and 3, 4 are both a shaft 1, an outer cylinder 2 fitted on the shaft 1, an outer peripheral surface of the shaft 1 and an outer cylinder 2. Infinite ball circulation composed of a ball holder 3 provided between the ball holder 3 and the inner peripheral surface, and a loaded ball portion 4 and an unloaded ball portion 5 formed by the ball holder 3 and the inner peripheral surface of the outer cylinder 2. It has a structure including a path and a ball 6 arranged in the ball infinite circulation path (the same components as those in this embodiment are designated by the same reference numerals).

In the linear motion ball bearing having the above structure, the type shown in FIGS. 1 and 2 uses a C-shaped ring member 31 (snap ring type) as a ring for stopping the ball holder 3. The ring member 31 is rotated with respect to the outer cylinder 2 (the ring member 31 is disengaged from the outer cylinder 2 when the ring member 31 is rotated because the outer cylinder 2 is C-shaped) and the ring. The member 31 is a concave groove of the outer cylinder 2.
Even though it fits in 32, it has the drawback of rattling.

The type shown in FIGS. 3 and 4 is the ball holder 3.
Although a screw-in type ring member 33 for stopping the ring is adopted, this ring member 33 is troublesome because it is screwed into the outer cylinder 2 and the screwing of the ring member 33 and the outer cylinder 2 is continuously used. Due to the fact that the outer cylinder 2 is C-shaped (the looseness of this screwing is remarkable) and that the ring member 33 and the outer cylinder 2 are difficult to screw together. Have This last drawback is detailed below.

That is, in the type shown in FIGS. 3 and 4, after the cylindrical outer cylinder 2 is formed, the inner peripheral surface of the outer cylinder 2 near both ends is screw-cut, and then a predetermined portion of the outer cylinder 2 is cut. Since the step of forming the outer cylinder 2 having a C-shaped cross section is performed, the screw portion of the outer cylinder 2 may be deformed by cutting a predetermined portion of the outer cylinder 2, and the ring member 33 and the outer cylinder 2 may be deformed. Good threading cannot be achieved.

The present invention solves these drawbacks.

[0008]

The gist of the present invention will be described with reference to the accompanying drawings.

A shaft 1, an outer cylinder 2 fitted on the shaft 1, a ball holder 3 provided between an outer peripheral surface of the shaft 1 and an inner peripheral surface of the outer cylinder 2, and the ball holder 3 Linear movement consisting of an infinite ball circulation path composed of a loaded ball portion 4 and an unloaded ball portion 5 formed by an inner peripheral surface of the outer cylinder 2 and a ball 6 arranged in the ball infinite circulation path. Is a ball bearing for use with a cylindrical member having a C-shaped cross section as the outer cylinder 2,
A concave groove 7 is circumferentially provided on the inner peripheral surface of the cylindrical member near the left and right ends in the axial direction, and a locking concave portion 8 is formed on the inner peripheral surface. A C-shaped restricting ring 9 formed of an elastic member that restricts the axial movement of the body 3 is provided, a convex portion 9a is formed on the front surface or the back surface of the restricting ring 9, and the regulating ring 9 is formed by the convex portion 9a. It is characterized in that an elastic force is urged axially in the concave groove 7, and that a locking projection 9b that is locked in the locking recess 8 of the outer cylinder 2 is provided at an arbitrary position of the restriction ring 9. The present invention relates to a ball bearing for linear movement.

In the ball bearing for linear movement according to the first aspect, a bent convex portion 9a formed by bending the restriction ring 9 is adopted as the convex portion 9a of the restriction ring 9, and
The present invention relates to a linear motion ball bearing characterized in that a cut-and-raised projection 9 formed by cutting and raising a part of the regulation ring 9 is adopted as the locking projection 9b.

[0011]

The regulation ring prevents the ball holder from moving in the axial direction, the convex portion of the regulation ring prevents the regulation ring from rattling in the concave groove, and the locking projection of the regulation ring prevents The restriction ring is prevented from rotating with respect to the outer cylinder.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 5, 6 and 7 show an embodiment of the present invention, which will be described below.

An outer cylinder 2 having a C-shaped cross section is provided. On the inner peripheral surface of the outer cylinder 2, there are formed a loaded ball contact portion 2a forming the loaded ball portion 4 and an unloaded ball contact portion 2b forming the unloaded ball portion 5.

A concave groove 7 having a predetermined depth is provided on the inner peripheral surface of the outer cylinder 2 near the left and right ends.

A ball holder 3 is provided. The ball holder 3 is formed by bending and pressing a thin metal plate, and has a long window portion 3a forming a load ball portion 4 and a curved portion 3b forming an unloaded ball portion 5.

Therefore, the load ball contact portion 2a and the long window portion 3
a and the unloaded ball contact portion 2b and the curved portion 3b form the unloaded ball portion 5, and in the present embodiment, five unloaded ball portions 4 and 5 unloaded ball portions, respectively. Five ball infinite circulation paths are formed by 5.

Further, a concave groove 10 is formed on the inner peripheral surface of the outer cylinder 2 between the loaded ball contact portion 2a and the unloaded ball contact portion 2b, and the ball holder 3 is placed in the concave groove 10. Bulge 3c
Is inserted, and rotation prevention of the ball holder 3 with respect to the outer cylinder 2 is achieved.

The restriction ring 9 fitted in the concave groove 7 of the outer cylinder 2 is formed of a thin metal plate as shown in FIG. 7 and has appropriate elasticity, and is formed by bending three convex portions. The portion 9a is cut and raised at one place to form a protrusion 9b.

The restriction ring 9 is fitted in the groove 7 of the outer cylinder 2. The restriction ring 9 is held in the concave groove 7 by the convex portion 9a without rattling, and the cut-and-raised protrusion 9
Due to b, the restriction ring 9 cannot rotate with respect to the outer cylinder 2.

Therefore, according to this embodiment, the restriction ring 9
Does not rotate with respect to the outer cylinder 2, and therefore the outer cylinder 2
And the restriction ring 9 does not move in the axial direction of the outer cylinder 2 and does not rattle, so that the ball holder 3
Therefore, the ball bearing for linear movement can be precisely moved linearly with respect to the shaft 1, and its assembly is very simple.

Incidentally, it is desirable to attach a ring-shaped seal member to the outside of the restriction ring 9 to prevent dust and the like from entering.

[0022]

Since the present invention is constructed as described above, it is a linear motion ball bearing which can surely fix the ball holder at an accurate position and is excellent in mass productivity.

[Brief description of drawings]

FIG. 1 is a front view in which a part of a conventional example is cut away.

FIG. 2 is a side view of the above.

FIG. 3 is a front view in which a part of another conventional example is cut away.

FIG. 4 is a side view of the above.

FIG. 5 is a side view in which a part of this embodiment is cut away.

FIG. 6 is a front view in which a part of the present embodiment is cut away.

FIG. 7 is a perspective view of a restriction ring of this embodiment.

[Explanation of symbols]

 1 Axis 2 Outer Cylinder 3 Ball Holder 4 Loaded Ball 5 Unloaded Ball 6 Ball 7 Recessed Groove 8 Engagement Recess 9 Restriction Ring 9a Convex 9b Protrusion

Claims (2)

[Claims] 1. A shaft, an outer cylinder fitted on the shaft, a ball holder provided between an outer peripheral surface of the shaft and an inner peripheral surface of the outer cylinder, and an inner portion of the ball holder and the outer cylinder. A ball bearing for linear motion, comprising an infinite ball circulation path formed of a loaded ball portion and an unloaded ball portion formed of a peripheral surface, and a ball disposed in the ball infinite circulation path, which is an outer cylinder. A cylindrical member having a C-shaped cross section is employed as the groove member, and a concave groove is circumferentially provided on the inner peripheral surface of the cylindrical member near the left and right ends in the axial direction, and a locking concave portion is formed on the inner peripheral surface. A C-shaped restricting ring formed by an elastic member whose outer peripheral edge is fitted to restrict the axial movement of the ball holder is provided, and a convex portion is formed on the front surface or the rear surface of the restricting ring and the convex portion The restriction ring is elastically biased in the groove in the axial direction, and further, any part of the restriction ring is pressed. A ball bearing for linear movement, characterized in that a locking projection that is locked in the locking recess of the outer cylinder is provided at a position. 2. The ball bearing for linear movement according to claim 1, wherein a bent convex portion formed by bending the restriction ring is used as a convex portion of the restriction ring, and the restriction ring is used as a locking projection. A ball bearing for linear movement, which features a cut-and-raised protrusion formed by cutting and raising a part of