JP2002005162A - Rolling guide unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rolling guide unit capable of preventing dropping of a roller in a joint part between track rail bodies and concentration of stress and smoothly moving the roller from a track rail body to another track rail body, in the rolling guide device having a track rail having a plurality of track rail bodies disposed in series. SOLUTION: This rolling guide unit comprises a track rail 1 having roller rolling surfaces 11a and 11b longitudinally, a moving block mounted movably relatively to the track rail 1 and having an endless circulation passage including load roller rolling surfaces corresponding to the roller rolling surfaces 11a and 11b, and a plurality of rollers 3 that are arranged and stored in the endless circulation passage and circulate in the endless circulation passage following the relative movement between the track rail 1 and the moving block. The track rail 1 has a structure in which the plurality of track rail bodies 1-1 are interconnected in series, the joint surface 11c between the mutually connecting track rail bodies 1-1 crosses a rotation axis of the rollers 3 rolling on the roller rolling surfaces 11a and 11b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolling guide device in which a moving table and a track rail are movably engaged via an infinitely circulating roller array, and more particularly to a joint structure between the track rail and the track rail. The present invention relates to a rolling guide device having:

[0002]

2. Description of the Related Art Conventionally, there has been known a rolling guide device in which a movable table and a track rail are movably engaged via a row of rollers that circulate infinitely. Specifically, a load is applied between a number of rollers, a track rail provided on a fixed portion such as a bed and provided with a rolling surface of the roller, and the roller applies a load to a rolling surface of the track rail. And a moving table equipped with an infinite circulation path of rollers including the load rolling surface. It can move freely on the track rail with the endless circulation.

[0003] In the above-mentioned rolling guide device, when the track rail is constituted by connecting a plurality of track rail bodies in series, a joint surface between the track rails connected to each other is:
Since the roller is parallel to the rotation axis of the roller that rolls on the roller rolling surface, the roller falls into the gap between the joints between the track rails and the track rails, causing the rollers to not move smoothly and causing vibration. In addition, there is a problem that stress is concentrated on the joint portion and the joint portion is worn out or damaged early.

FIG. 7 is a diagram showing an example of a roller dropping in a gap between a track rail and a joint between the track rails. FIG.
, The diameter D of the roller 101 and the track rail body 102
When the dimension A of the gap 103 between the
8, the maximum drop amount X of the roller 101 is (D / 2) ² = (A / 2) ² + Z ² Z ² = (D / 2) ^2- (A / 2) ² Z = ｛(D / 2) ² − (A / 2) ² ｝ ^1/2 X = (D / 2) −Z = (D / 2) − ｛(D / 2) ² − (A / 2) ² ｝ ^1/2 . Therefore, for example, the diameter D of the roller 101 is 4 m.
m, the dimension A of the gap 103 = 0.1 mm, X =
0.625 μm.

As shown in FIGS. 9A and 9B,
Assuming that the diameter of the roller 101 is D = 4 mm and the length L = 7 mm, when the roller 101 makes line contact with the roller rolling surface of the track rail, the sum 主 ρ of the main curvature (the reciprocal of the main curvature radius) is Σρ = ρ ₁₁ + ρ ₁₂ + ρ ₂₁ + ρ ₂₂ , as shown here, ρ ₁₁ = 0.5, ρ ₁₂ ≒
Since 0, ρ ₂₁ ≒ 0, and ρ ₂₂ ≒ 0, Σρ = 0.5.

By applying this formula to the contact width b when the load Q is applied, b = {(8 / πE) (1-1 / m ² ) (1 / Σρ) · (Q / l)｝ ^{1 / 2} (1) Here, E: modulus of longitudinal elasticity = 21000 kgf /
mm ² , m: Poisson number (1 / Poisson ratio) = 1/0.
3 = 3.33, l: length of contact portion = 7 mm (without considering crowning), Q: load applied to one roller. Here, the load Q received by one roller 101 is 98.9 kg.
Assuming that f, b ≒ 0.056 mm, the average pressure P is P = Q / (2bl) = 126 kgf / mm ² , and the maximum pressure Pmax is 4 / π times the average pressure, so that Pmax = (4 / Π) 126 kgf / mm ² ≒ 160 k
gf / mm ² .

[0007] As shown in FIG. 10, the sum of the curvatures Σρ at the joints between the track rail bodies 102 and 102 is ρ _{11 when} the radius R of the corner of the track rail body 102 at the joint is R = 0.2.
= 1/2 = 0.5, ρ ₁₂ = 1 / ∞ ≒ 0, ρ ₂₁ = 1/0.
Since 2 = 5 and ρ ₂₂ = 1 / ∞ ≒ 0, Σρ = ρ ₁₁ + ρ ₂₁ = 5.5, and if the load Q received by one roller 101 is 98.9 kgf in the same manner as described above, this load is In the gap 103 between the track rail bodies 102, the load is received at two places, and the load received at the corner of one track rail body 102 is half of 98.9 kgf, that is, 49.45 kgf. Then, the contact width when this load is applied is b２0.012 mm from the above equation (1).

The average pressure P is P = Q / (2bl) ≒ 294 kgf / mm ² , and the maximum pressure Pmax is Pmax = (4 / π) 294 kgf / mm ² ≒ 374k
gf / mm ² , and the track rail bodies 102 and 102 receive the maximum pressure Pmax twice or more as large as that of the roller 101 at the joint.

[0009]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and a rolling guide device having a track rail in which a plurality of track rail bodies are arranged in series.
It is an object of the present invention to provide a rolling guide device in which a roller at a joint portion between a track rail body and a track rail body is prevented from dropping and stress is concentrated, so that the roller can smoothly move from the track rail body to the track rail body. Aim.

[0010]

According to a first aspect of the present invention, there is provided a track rail having a roller rolling surface along a longitudinal direction, and the track rail is incorporated so as to be relatively movable with respect to the track rail. A moving platform provided with an infinite circulation path including a load roller rolling surface corresponding to a roller rolling surface, and arranged and housed in the infinite circulation path and circulated in the infinite circulation path with the relative movement of the track rail and the moving table. A plurality of rollers, and the track rail has a configuration in which a plurality of track rail bodies are connected in series, and a joint surface between the track rail bodies connected to each other is a roller rolling surface. Are arranged so as to intersect with the rotation axis of the roller rolling.

As described above, since the joint surface between the track rail bodies connected to each other intersects with the rotation axis of the roller rolling on the roller rolling surface, the roller is in contact with the track rail body. Stress does not concentrate at the joint of the track rail body without falling into the gap between the rail bodies.

The invention described in claim 2 is the first invention.
In the rolling guide device described in the above, the track rail has a plurality of roller rolling surfaces, and a joint surface between the track rail bodies connected to each other intersects with the rotation axis of the roller rolling on each roller rolling surface. It is characterized by the following.

[0013] The invention described in claim 3 is the first invention.
In the rolling guide device according to the second aspect, the plurality of rollers circulating in the endless circulation path of the moving table are independent of each other or connected by a roller connecting body.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 are views showing a configuration example of a rolling guide device according to the present invention. In the drawings, reference numeral 1 denotes a track rail provided for a fixed portion such as a bed of a machine tool, reference numeral 2 denotes a movable table for guiding a movable body such as a table along the track rail 1, and reference numeral 3 denotes a track. The roller is a roller that rolls while applying a load between the rail 1 and the moving table 2 and circulates infinitely in the moving table 2.

The track rail 1 is formed in a substantially rectangular cross section, and has a roller rolling surface 11 on which the roller 3 rolls.
A and 11b are formed in total of four lines along the longitudinal direction (the direction perpendicular to the paper surface of FIG. 1). These roller rolling surfaces 11a, 1
1b is formed on both side surfaces and both edges (both shoulders) of the upper surface of the track rail 1, and the roller rolling surfaces 11a on both side surfaces are formed downward by a predetermined angle toward the center of the track rail 1. The roller rolling surface 11b on the upper surface is formed upward at a predetermined angle toward the center of the track rail 1. Further, a bolt mounting hole 12 is formed in the track rail 1 at an appropriate interval in the longitudinal direction, and the track rail 1 is fixed by a fixing bolt (not shown) inserted into the bolt mounting hole 12.

On the other hand, the moving table 2 has a mounting surface 41 for fixing a movable body such as a table and a moving block 4 having a tap hole 42 into which a fixing bolt of the movable body is screwed.
And a pair of lids 5, 5 fixed to the front and rear end surfaces of the moving block 4.
Is fixed to the moving block 4 so that an infinite circulation path of the rollers 3 is provided in the moving table 2. The lid 5 is provided with a seal member 6 that is in sliding contact with the track rail 1, and dust and the like adhering to the track rail 1 enter the movable table 2 as the movable table 2 moves. Is prevented. In the figure, reference numeral 7 denotes a grease nipple for supplying grease to the inside of the movable base 2.

On the other hand, the moving block 4 is provided with a horizontal portion 4a on which the mounting surface 41 is formed and a pair of skirt portions 4b, 4b which are suspended from both ends of the horizontal portion 4a in a substantially saddle-shaped section. On the lower surface side of the horizontal portion 4a and the inner surface side of the skirt portion 4b, four load rolling surfaces 43a, 43b facing the roller rolling surfaces 11a, 11b of the track rail 1 are formed. The horizontal portion 4
a and each of the load rolling surfaces 43a, 43
Roller return holes 44a and 44b respectively corresponding to b are formed.

The moving block 4 is manufactured using injection molding of a synthetic resin. That is, the moving block 4
Is a metal block body 4 formed by machining
The portion requiring mechanical strength, such as the mounting surface 41 of the moving body and the load rolling surfaces 43a and 43b of the roller 3, is formed of the corresponding block. On the other hand, the portions where mechanical strength is not important, such as the roller return holes 44a and 44b, are formed of synthetic resin while being formed on the main body 40, and the moving block 4 is made as light as possible.

The infinite circulation path of the rollers is completed by fixing the lid 5 to the end surface of the moving block 4. That is, when the lid 5 is fixed to the moving block 4, the U-shaped turning path 52 is completed, and the load turning surfaces 43a and 43b of the moving block 4 and the roller return holes 44a and 44b are formed by the turning path 52. Are linked.

As a result, the roller rolling surfaces 11a and 11b of the track rail 1 and the load rolling surfaces 43a and
When the roller 3 which has applied a load between the roller 3b and the moving table 2 finishes rolling on the load rolling surfaces 43a, 43b, the roller 3 is released from the load and moves in the direction of one of the lids 5. It enters the turning path 52 and transfers the roller return holes 44a and 44b of the moving block 4 in the direction opposite to the rolling direction on the load rolling surfaces 43a and 43b without any load. Further, the roller 3 which has finished rolling in the roller return holes 44a and 44b enters again between the track rail 1 and the moving block 4 through the direction change path 52 of the other lid 5, and applies the load while applying the load. Roll on the rolling surfaces 43a and 43b.

On both sides of each of the load rolling surfaces 43a and 43b, a roller guide portion 45 for guiding both end surfaces of the roller 3 rolling on the load rolling surfaces 43a and 43b is formed of synthetic resin. The rolling direction of the roller 3 is regulated from both sides by the roller guides 45 so that skew during transfer is prevented. Reference numeral 30 denotes a roller connecting body that connects the rollers 3 described later in detail, and is capable of holding a plurality of rollers 3 at a predetermined interval with respect to a flexible synthetic resin connecting member 31.

3 to 5 are views showing the structure of the track rail, FIG. 3 is a plan view, FIG. 4 is an external view of a part (joint portion) thereof, and FIGS. 5 (a) and 5 (b) are rollers, respectively. Rolling surface 11
It is a figure which shows the relationship between a and 11b and rollers 3,3 which roll. The track rail 1 has a structure in which a plurality of (three in the figure) track rail bodies 1-1 are provided in series. The joint rail surface 11c between the continuous track rail bodies 1-1 and the track rail bodies 1-1 intersects with the rotation axis 3a of the roller 3 rolling on the roller rolling surfaces 11b and 11a. .

As described above, the joint surface 11c between the track rail bodies 1-1 is made to intersect with the rotating shaft 3a of the roller 3 rolling on the roller rolling surfaces 11b and 11a. In a state where the rollers straddle the gap 8 between the joints between the rails 1-1, the roller rolls from the track rail body 1-1 to the track rail body 1-1. No stress is concentrated at the joints of the body. Therefore, early wear and breakage of the joint of the track rail body 1-1 are eliminated, and the life is extended. Rolling of the roller 3 from the track rail body 1-1 to the track rail body 1-1 is performed smoothly, and a smooth operation is obtained. Further, no vibration occurs when the roller 3 passes through the joint between the track rail body 1-1 and the track rail body 1-1.

Incidentally, the roller rolling surfaces 11a formed on both side surfaces of the track rail body 1-1 and the roller rolling surfaces 11b formed on both side edges (both shoulders) of the upper surface are formed by respective virtual extension surfaces. Intersect, ie, are not located in the same plane. Therefore, for example, as shown in a joint surface 11c-2 indicated by a two-dot chain line in FIG. 5, only the rotation axis 3a of the roller 3 rolling on the roller rolling surface 11b formed on both side edges of the upper surface intersects. So that this joint surface 1
1c-2 is parallel to the rotation axis 3a of the roller 3 rolling on the roller rolling surface 11a on both side surfaces of the track rail. Therefore,
The roller 3 rolling on the roller rolling surface 11a falls into the gap between the joints 11c-2.

In the rolling guide device of this embodiment, since the joint surface 11c intersects the rotation axis 3a of the roller 3 rolling on all the roller rolling surfaces 11a and 11b, No drop into the gap occurs.

FIG. 6 shows a roller connector 3 for connecting the rollers 3.
FIG. 9 is a diagram illustrating a configuration example of a zero. A plurality of rollers 3 are held in parallel at a predetermined interval with respect to a connecting member 31 made of a synthetic resin having flexibility. The connecting member 31 includes a plurality of spacers 3 interposed between the adjacent rollers 3.
2 and a band-like connecting portion 33 for connecting the spacers 32 to each other, and a pair of concave seats which are in sliding contact with the roller 3 adjacent to each spacer 32 are formed. Accordingly, each roller 3 is moved from the front and rear in its rolling direction to the above-mentioned spacer 3.
2 and held by the connecting member in a rotatable state. A convexly curved guide surface 34 is formed on the spacer 32 and the connecting portion 33 at the leading end or the rear end of the roller connecting body 30 to facilitate the movement of the roller connecting body when the roller 3 rolls. I have.

A connecting portion 33 for connecting the spacers 32 is connected to the spacer 32 at a position at which the outer periphery of the roller 3 is substantially bisected in the axial direction thereof. It is open without being covered by the part. Accordingly, the movement of the roller 3 in the axial direction at the time of rolling is restricted by the roller guide portion 45.

The configuration of the roller connecting member is an example,
It is a matter of course that the present invention is not limited to this. In addition,
Although not shown, the rollers 3 that roll on the infinite circulation path of the moving table 2 may be independently rolled without being held by the roller link.

[0029]

As described above, according to the invention described in each claim, the joint surface between the track rail bodies connected to each other intersects the rotation axis of the roller rolling on the roller rolling surface. Therefore, since the rollers do not fall into the gap between the track rail bodies and stress does not concentrate at the joint of the track rail bodies, the following excellent effects can be obtained.

(1) Premature wear and tear from the joint of the track rail body is eliminated, and the life is extended.

(2) Rolling of the rollers is smoothly performed, and a smooth operation state is obtained.

(3) Vibration does not occur when the roller passes through the joint between the track rails.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view showing a configuration example of a rolling guide device according to the present invention.

FIG. 2 is a partial longitudinal sectional view showing a configuration example of a rolling guide device according to the present invention.

FIG. 3 is a plan view showing a configuration example of a track rail of the rolling guide device according to the present invention.

FIG. 4 is an external view showing a configuration example of a joint of a track rail of the rolling guide device according to the present invention.

FIG. 5 is a diagram showing a relationship between a roller rolling surface and a roller at a joint portion of a track rail of the rolling guide device according to the present invention.

FIG. 6 is a diagram showing a configuration example of a roller connecting body that connects the rollers of the rolling guide device according to the present invention.

FIG. 7 is a diagram illustrating an example of a drop of a roller in a gap between a track rail body and a joint portion between the track rail bodies.

FIG. 8 is a diagram illustrating a calculation example of a drop of a roller in a gap between joints between a track rail body and a track rail body;

FIG. 9 is a diagram showing a main curvature between a roller and a roller rolling surface of a track rail body.

FIG. 10 is a diagram showing principal curvatures at joints between rollers, track rail bodies, and track rail bodies.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Track rail 1-1 Track rail 2 Moving table 3 Roller 4 Moving block 5 Lid 6 Sealing member 7 Grease nipple 8 Clearance

Claims (3)

[Claims] A track rail having a roller rolling surface along a longitudinal direction, and an infinite circulation path including a load roller rolling surface corresponding to the roller rolling surface which is incorporated to be relatively movable with the track rail. A rolling guide device comprising: a moving table provided; and a plurality of rollers arranged and housed in the infinite circulation path and circulating in the infinite circulation path with the relative movement of the track rail and the moving table, The track rail has a configuration in which a plurality of track rail bodies are provided in series, and a joint surface between the track rail bodies connected to each other intersects with the rotation axis of the roller rolling on the roller rolling surface. A rolling guide device characterized in that: 2. The rolling guide device according to claim 1, wherein the track rail has a plurality of roller rolling surfaces, and a joint surface between track rail bodies connected to each other rolls on each of the roller rolling surfaces. A rolling guide device that intersects the rotation axis of the roller that performs the rolling. 3. The rolling guide device according to claim 1, wherein the plurality of rollers circulating in the endless circulation path of the movable table are independent of each other or connected by a roller connecting body. Rolling guide device.