JP3335924B2 - Self-centering roller guide device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a self-centering roller guide device incorporated in a machine tool, for example.

[0002]

2. Description of the Related Art As a roller guide device incorporated in a machine tool, a roller guide device having a configuration shown in FIG. 3 has been developed by the present applicant. The roller guide device has roller rolling paths 1, 1 on the upper surface and roller rolling paths 2, 2 on both side faces.
A track rail 3 provided with an upper part 4 and a hanging part 5, and roller rolling paths 6 and 6 corresponding to the upper roller rolling paths 1 and 1 in the upper part 4 and side roller rolling paths 2 in the hanging part 5. The moving block 8 is formed so as to straddle the track rail 3 by forming the roller rolling paths 7 corresponding to 2 and the upper part of the moving block 8 so as to roll on the upper roller rolling path 1 of the track rail 3. 4, and a row of rollers 10, 10 provided on a hanging portion 5 of a moving block 8 so as to roll on the side roller rolling path 2 of the track rail 3. The block 8 is moved along the track rail 3 via the roller rows 9 and 9 and the roller rows 10 and 10.

In the above roller guide device, the upper roller rolling path and the side roller rolling path of the track rail are flat, and the roller rolling corresponding to the upper roller rolling path of the track rail provided above the moving block. The roller rolling path corresponding to the side roller rolling path of the track rail provided on the road and the hanging part is a plane, and the rollers of the roller row provided on the upper part of the moving block and the hanging part of the moving block are cylindrical rollers. is there.

[0004]

The roller guide device of the above-mentioned type has a flat roller rolling path in which a cylindrical roller provided on an upper portion of a moving block and a cylindrical roller provided on a hanging portion are provided on an upper surface of a track rail. By rolling the flat roller rolling path provided on the side surface, the moving block is moved along the track rail, and the moving block has no centering property with respect to the track rail. Therefore, when the moving block moves in the lateral direction with respect to the track rail, the cylindrical rollers of the cylindrical roller row tilt, and the end face of the cylindrical roller hits the side wall of the flat roller rolling path or the cylindrical roller It falls down, and smooth rotation of the cylindrical roller cannot be obtained.

In the roller guide device of the type described above, since the flat roller rolling path provided on the upper surface of the track rail and the flat roller rolling path provided on the side face are formed by grooves, the end face of the cylindrical roller and the flat surface are used. It is necessary to increase the processing accuracy with respect to the side wall of the groove forming the roller rolling path, which increases the manufacturing cost.

In the roller guide device of the above type, since the moving block is formed of steel, a through hole for passing the row of rollers of the moving block must be formed by machining, and high precision is required for the machining. Therefore, it is difficult for the worker to improve the productivity because the skill is required and the machining is troublesome.

The present invention has been made in view of the above points, and a moving block disposed so as to straddle a track rail receives a lateral force perpendicular to the moving direction and moves in a lateral direction with respect to the track rail. Even if the lateral force is released, an object of the present invention is to provide a self-centering roller guide device capable of automatically returning to the initial position from the position where the moving block has moved.

[0008]

SUMMARY OF THE INVENTION A self-centering roller guide device according to the present invention has a concave roller rolling path of a concentric arc at a point on a vertical line passing through a longitudinal center on both sides of an upper surface and the above-mentioned point on both sides. A track rail having a concentric arcuate convex roller rolling path, a moving block disposed so as to straddle the track rail, and a concave roller rolling path provided on the upper surface of the track rail provided on the moving block. A moving roller and a continuous roller row that rolls on a convex roller rolling path provided on a side surface of the track rail provided on the moving block, and the moving block crosses the track rail at right angles to the moving direction. When the force is released even if the moving block moves laterally, the moving block can be automatically returned to the initial position by the load applied to the moving block.

In the self-aligning roller guide device of the present invention, a retainer holding portion is formed at a lower portion of a moving block, and a space is provided in the retainer holding portion for passing a row of rollers connected by a retainer. There is no need to form a through-hole through which the hole passes by machining, and the manufacturing cost can be reduced.

The self-centering roller guide device of the present invention is provided with a saw-shaped roller for rolling a concave roller rolling path provided on the upper surface of a track rail and a convex roller rolling path provided on a side surface of the track rail. The conical roller is disposed on a 45-degree line obliquely downward with respect to the horizontal plane of the track rail, so that the vertical load and the lateral load applied to the moving block can be controlled to be equal.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a perspective view of one preferred embodiment of a self-centering roller guide according to the present invention.

Self-aligning roller guide device 2 according to the present invention
1 has a track rail 21 arranged in a horizontal direction and a moving block 22 movably arranged along the track rail 21 across the track rail 21 as shown in FIGS.

As shown in FIGS. 1 and 2, the track rail 21 has upper concave roller rolling paths 23, 2 on both sides of the upper surface.
3, and side convex roller rolling paths 24, 24 on both side surfaces. The upper concave roller rolling paths 23 formed on both sides of the upper surface of the track rail 21 are on an arc 26 having a radius R centered on a point O of a vertical imaginary line 25 passing through the longitudinal center of the track rail 21. It has a concave surface of the same shape. The side convex roller rolling paths 24, 24 formed on both side surfaces of the track rail 21 are the concave roller rolling paths centered on a point O of a vertical imaginary line 25 passing through the longitudinal center of the track rail 21. 23 has a concentric convex surface with the concave surface.

The upper concave roller rolling path 23 and the side convex roller rolling path 24 provided on the track rail 21 intersect with the imaginary line 25 at an angle of 45 degrees as shown in FIG. It is located on the virtual line 27. That is, the upper concave roller rolling path 23 and the side convex roller rolling path 24 are formed by a vertical imaginary line 2 passing through the longitudinal center of the track rail 21.
5 are arranged side by side on a radius line centered on point O.

The moving block 22 includes a block main body 28 made of steel and a block main body 28.
Has a retainer holding portion 29 integrally formed at a lower portion of the holder. The retainer holding portion 29 is formed, for example, by insert-molding a synthetic resin material such as Delrin into a mold (not shown). The retainer holding portion 29 has a space 30 through which a row of rollers rolling on the upper concave roller rolling path 23 and a space 31 through which a roller row rolling on the side concave roller rolling path 24 are formed.

When the moving block 22 is disposed so as to straddle the track rail 21, the spaces 30, 31 of the retainer holding portion 29 provided in the moving block 22 provide the concave roller rolling path 23 and the convex roller rolling path of the track rail 21. It is located corresponding to the movement path 24. In the spaces 30 and 31, a roller row connected by a retainer described later is arranged. Retainer holding part 2
9 is provided with an end plate 33 which also serves as a direction changing portion in a space 31 formed radially inward on the same imaginary line 25 of the block body 28 (one end plate 33 is removed in FIG. 1). ) To form a roller circulation path. The space 30 of the roller circulation path acts as a roller load area, and the space 32 of the roller circulation path acts as a roller no-load area.

Similarly, the space 31 provided in the retainer holding portion 29 is provided with a block body 28 via an end plate 33.
Is connected to a space 34 formed radially outward on the same imaginary line 25 of the block main body 28 with the interposition therebetween to form a roller circulation path. The space 31 of the roller circulation path functions as a roller load area, and the space 34 of the roller circulation path functions as a roller no-load area.

In each roller circulation path corresponding to the upper concave roller rolling path 23 of the moving block 22, there is provided a so-called tapered roller 35 whose outer surface is a convex surface corresponding to the concave surface of the upper concave roller rolling path 23. Many are arranged. Each of the saw-shaped rollers 35 constitutes a saw-shaped roller row connected via a retainer (not shown). Tie-shaped roller 35
Are disposed endlessly throughout the roller circulation path. The retainer provided in the saw-shaped roller row fits into a not-shown retainer groove formed in the roller circulation path, and rotates the saw-shaped roller 35 in a normal state.

Each of the roller circulation paths corresponding to the side convex roller rolling paths 24, 24 of the moving block 22 has a so-called conical shape in which the outer surface is a concave surface corresponding to the convex surface of the upper convex roller rolling path 24. Many rollers 36 are arranged. The tab-shaped roller 36 is connected via a retainer (not shown) and is disposed endlessly throughout the roller circulation path. The retainer forming the continuous roller row is fitted into a retainer groove (not shown) formed in the roller circulation path, and rotates the continuous roller 36 in a normal state.

On the other hand, the self-centering roller guide device 20
A closed space 37 is formed between the lower portion of the block body 28 and the retainer holding portion 29. This closed space 37 is provided with a hydraulic circuit 38 attached to the self-centering roller guide device 20.
It is connected to. Therefore, when pressure oil is supplied to the hydraulic circuit 38, the pressure oil causes the retainer holding portion 29 to move to the track rail 2.
1 and pressed the lower surface of the retainer holding portion 29 against the upper surface of the track rail 21. By frictionally engaging the retainer holding portion 29 with the track rail 21, the moving block 22 can be stopped at a desired position with respect to the track rail 21, and damping of the moving block 22 can be suppressed. A sensor mechanism (not shown) is provided in the hydraulic circuit 38, and the hydraulic circuit 38
Can be varied according to the vibration of the machine.

Next, the operation will be described.

The moving block 22 includes a rectangular roller 35.
Are arranged so as to roll on the upper concave roller rolling path 23 of the track rail 21, and the continuous roller 36 is connected to the track rail 21.
By arranging the side convex roller rolling path 24 so as to roll, it moves along the track rail 21.

When the moving block 22 moves along the track rail 21 when a lateral force perpendicular to the moving direction is applied to the moving block 22, the moving block 22 causes the rectangular roller 35 to move along the track rail 21. It contacts the upper concave roller rolling path 23 and moves the continuous roller 36 to the track rail 2.
1 is in contact with the side convex roller rolling path 24, so that the rectangular roller 3
5 and the roller 36 move laterally without falling down.

When the moving block 22 is moved in the horizontal direction along the track rail 21 and the horizontal force applied to the moving block 22 is released, the moving block 2 is moved.
2 automatically returns from the position moved in the lateral direction to the initial position due to a synergistic effect of the own weight and the applied vertical load. That is, the moving block 22 has complete self-centering with respect to the track rail 21.

When the moving block 22 is moved, the saw-shaped roller 35 which rolls on the upper concave roller rolling path 23 of the track rail 21 and the side convex roller rolling path 24 of the track rail 21 are continued. The roller 36 is
Since the retainer that connects the rollers is fitted in the retainer groove provided in the roller circulation path, the saw-shaped roller 35 and the continuous roller 36 can be moved from the normal position even if the moving block 22 moves in the lateral direction. The roller rolling path can smoothly roll without falling down in the lateral direction.

The moving block 22 is provided with the track rail 2.
1 is supported by the upper concave roller rolling path 23 and the side convex roller rolling path 24 formed at an angle of 45 degrees diagonally downward with respect to the horizontal plane, and moves along the track rail 21. When moving along the vertical direction 21, the vertical load (vertical load) and the lateral load (left / right load) applied to the moving block 22 become equal loads.

[0027]

As described above, the self-centering roller guide device according to the present invention has concentric concave roller rolling paths on both upper surfaces of a track rail and convex roller rolling paths on both side faces. Since the moving block arranged so as to straddle the rail is provided with a rectangular roller row corresponding to the concave surface of the concave roller rolling path and a hook-shaped roller corresponding to the convex roller rolling path provided on the side surface, the moving block is provided. When the force is released even when the rail is moved in the lateral direction perpendicular to the moving direction, the moving block automatically returns to the initial position due to the load applied to the moving block, and self-centering can be secured.

[Brief description of the drawings]

FIG. 1 is a perspective view of a self-aligning roller guide device according to the present invention with a part thereof removed.

FIG. 2 is a cross-sectional view of the self-centering roller guide device according to the present invention.

FIG. 3 is a diagram showing a conventional self-centering roller guide device.

[Explanation of symbols]

 REFERENCE SIGNS LIST 20 self-aligning roller guide device 21 track rail 22 moving block 23 upper concave roller rolling path 24 side convex roller rolling path 28 block body 29 retainer holding section 30 space 31 space 35 tapered roller 36 continuous roller

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-59-219518 (JP, A) JP-A-6-330939 (JP, A) JP-A-63-190927 (JP, A) 303391 (JP, A) JP-A-10-110728 (JP, A) JP-A-7-4432 (JP, A) JP-A-55-155919 (JP, A) JP-A-9-88949 (JP, A) Japanese Utility Model Application Showa 63-91722 (JP, U) Japanese Utility Model Application Showa 62-68022 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F16C 29/04-29/06 F16C 31/04 -31/06

Claims (4)

(57) [Claims] 1. A track rail having a concave roller rolling path of a concentric arc formed at a point on a vertical line passing through the longitudinal center on both sides of an upper surface, and a convex roller rolling path of a concentric arc formed at said points on both sides. , A moving block disposed so as to straddle the track rail, a saw-shaped roller row rolling on a concave roller rolling path provided on the upper surface of the track rail provided on the moving block, and a track rail provided on the moving block Self-aligning roller guide device having a row of conical rollers that rolls on a convex roller rolling path provided on a side surface of the roller. 2. A retainer holding portion is formed at a lower portion of a moving block, and a space for passing a row of saw-shaped rollers is provided at a portion corresponding to an upper concave roller rolling path of a track rail of the retainer holding portion, and a track of the retainer holding portion is provided. 2. The self-centering roller guide device according to claim 1, wherein a space for passing the contiguous roller row is provided at a portion corresponding to the side convex roller rolling path of the rail. 3. A row of saw-shaped rollers is formed by connecting a plurality of saw-shaped rollers with a retainer, and a row of spike-shaped rollers is formed by connecting a plurality of hook-shaped rollers with a retainer. The self-centering roller guide device according to claim 1, wherein: 4. The self-centering device according to claim 1, wherein the crawler roller and the conical roller are arranged side by side on a 45-degree line obliquely downward with respect to the horizontal plane in the moving direction of the moving block. Roller guide device.