JP2894089B2 - Linear motion bearing - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bearing for linear motion.

[0002]

2. Description of the Related Art Linear motion bearings are used for machine tools such as NC machines, X, Y, and Z axes, other processing machines, automatic welding machines, injection molding machines, automatic transport devices, industrial robots, and other general industrial machines. Are often used in the slide section.

FIGS. 12, 13 and 14 are, for example, a half-section half-plane view, a half-section side view and a side view of a linear sliding bearing disclosed in Japanese Patent Application Laid-Open No. 59-205024, respectively. FIG. 12 shows a cross section taken along line E-E of FIG.
FIG. 13 shows a DD section of FIG. In these figures, 100 is sliding base (corresponding to sliders body 1 of FIG. 1, hereinafter the same), 200 track rail (rail 5), 300
Is a rolling groove (load ball rolling passage 7), 400 is a relief ball hole (no-load ball return passage 8), 500, 600
Denotes a lid (ball return pieces 2 and 3), and 700 denotes a ball (ball 4).

[0004] The linear motion bearing includes a sliding table 10.
The inner surfaces of the two sleeves facing each other are formed in an inclined shape, and a trapezoidal concave portion having an open side is provided on the lower surface side. And a substantially semi-circular rolling groove 300 which forms a load ball area opposing each other is formed on the inclined surface of the track base 200 facing the inner surfaces of both sleeves of the slide table 100. The load is applied by each ball 700 rolling in the load ball area, thereby solving the problems in the linear sliding bearings up to that time, and at the same time, applying a large load in the upward and leftward and rightward and radial directions. It is like that.

[0005]

SUMMARY OF THE INVENTION Japanese Patent Laid-Open No. 59-2050
No. 24, the linear sliding bearing disclosed in
Since the number of the endless track of the ball 700 formed on the slide table 100 side and the number of the rolling grooves 300 formed on the track table 200 side are halved as compared with the conventional linear sliding bearing of this type, these endless tracks and The troublesome processing of the rolling grooves was reduced by half, and the manufacturing cost was significantly reduced.

However, in this linear sliding bearing, it is necessary to provide a return passage for the unloaded ball 700, which is referred to as a relief ball hole 400, in the slide table 100.

This escape ball hole 400 is nearly 10 times as long as its diameter, so it is difficult to bend the drill at the time of machining, and it is difficult to machine it with high precision. Therefore, a significant increase in the number of processing steps was inevitable.

SUMMARY OF THE INVENTION An object of the present invention is to provide a linear motion bearing which can easily process a no-load ball return passage (escape ball hole), has good processing accuracy, and can greatly reduce the number of processing steps. Is what you do.

[0009]

Means for Solving the Problems The constitution of the present invention to solve the above-mentioned problems is as follows.

A slider performs linear movement by applying a load to the rail and a number of balls while applying a load to the rail to perform a linear motion, and rolls between the slider and the rail to pass the ball in the opposite direction. A linear motion bearing provided with a no-load ball return passage which is returned to the slider body, wherein the slider has a slider body, a ball return piece, and the ball return piece on one side of the rail of the slider body. And a ball groove piece interposed between the load ball rolling groove and a load ball rolling groove on the other side of the rail of the slider body. A no-load ball return groove with a part of the side surface opened is formed, and the ball return piece has a mounting surface mounted on both front and rear ends in the movement direction of the slider body, and a mounting surface formed on the mounting surface. A ball reversing portion formed and guided to guide the ball while changing the depth in a substantially semicircular shape, and reversing the direction of the ball, and a no-load ball return groove continuous with the ball reversing portion and partially open. The ball return groove cover portion is formed to protrude from the mounting surface, and the ball groove piece has a load ball rolling groove partially open on a side surface and a part opened. A non-loaded ball return groove is formed, and when the ball return piece is mounted on the slider body via the ball groove piece, no load is applied to each of the ball return piece and the ball groove piece. Open portions of the ball return grooves are joined to face each other to form the completed no-load ball return passage, and further, the ball groove piece is formed in the slider body. A clamping bolt fixed to the slider body perpendicularly to the plane portion of the slider body, and the ball groove piece is pressed from a direction parallel to the plane portion of the slider body to fix the ball return piece through the slider body. A push screw for adjusting the position between the ball groove piece and the ball return piece is provided.

[0016]

According to the present invention, the slider main body is constituted by a plurality of parts, and the no-load ball return passage is formed at a portion adjacent to the plurality of members. The hole can be provided as a groove instead of being formed in the hole. If it is a groove, it can be processed by milling, it can also be formed when the whole part is drawn out or molded by precision casting, and processing with good processing accuracy becomes possible,
Processing man-hours can be significantly reduced. In addition, the slider has a slider body and a ball return piece as constituent elements, and the ball return piece is configured by a mounting surface of the slider body, a ball reversing portion, and a no-load ball return passage, so that the configuration is simplified. Easy installation and assembly , and multiple members
Between the slider body and the ball return piece
Since the ball groove piece are provided, a plurality of parts material thereof
It is easy to adjust the mutual position of the ball
Road, no-load ball return passage
You.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1 to 4 are explanatory views of the structure that the applicant has prototyped and used in the present invention. FIG. 1 is a plan view of the right half and FIG.
FIG. 2 is a front view of the right half, and FIG. 1 is a left half of FIG.
3 is a side view, and FIG. 4 is a perspective view of a ball return piece.

In these figures, 1 is a slider body of a bearing for linear motion, 2 and 3 are ball return pieces attached to both ends of the slider body 1 in the moving direction, 4 is a ball, 5 is a rail, and 6 is a ball. A fixing screw for fixing the return pieces 2 and 3 to the slider body 1, a reference numeral 7 denotes a loaded ball rolling passage, and a reference numeral 8 denotes a non-loaded ball return passage.

The slider body 1 is made of hardened steel and has a loaded ball rolling groove 1a having a semicircular cross section and a no-load ball return groove 1b having a semicircular cross section. Mounting surfaces 2a, 3a provided with circular ball reversing portions 2b, 3b and no-load ball return grooves 2c, 3c formed integrally therewith and having a semicircular cross section.
Provided with a pair of ball return groove lids 2d, 3d
rail made of plastic injection molded product
Is made of hardened steel and has a load ball rolling groove 5a having a semicircular cross section. The ball 4 is made of hardened steel, 4a is a ball at a position where a load is applied and rolling occurs, and 4b is a ball at a position where the ball returns without a load.

In this structure , when the slider body 1 moves upward in FIG.
Since a rolls while contacting both the slider body 1 and the rail 5, it moves upward at half the moving speed of the slider body 1. In other words, the slider moves downward with respect to the slider body 1 at a relative speed of 1/2 of the moving speed.
Then, the ball 4 which has reached the position of the mounting surface 2a of the ball return piece 2 moves along the ball reversing portion 2b and reverses, and the unloaded ball return groove 1b of the slider body 1 and the unloaded ball of the ball return groove cover 2d. Return groove 2
c, moves upward through the loaded ball rolling passage 8 formed by the loaded ball rolling groove 8a, and is again inverted by the no-loaded ball return groove 3b of the ball return piece 3, and again between the loaded ball rolling groove 1a of the slider body 1 and the rail 5. The load comes in contact with the loaded ball rolling groove 5a. That is, it passes through the loaded ball rolling path 7. By repeating such a process, it is possible to move infinitely as long as the rail 5 continues.

When the ball return pieces 2 and 3 are combined at both ends of the slider body 1, the linear motion bearing of this structure is integrated with the no-load ball return groove 1b of the slider body 1 and the ball return pieces 2 and 3. No-load ball return grooves 2c, 3 having a semicircular cross section provided on the ball return groove lids 2d, 3d respectively.
The no-load ball return passage 8 having a circular cross section is formed by combining c.

FIG. 5 is a partial modification of the structure shown in FIGS.
In the perspective view of the main part of the structure , the difference from the structure of FIGS.
In the ball return piece 2A, the ball return groove lid 2Ad formed integrally with the mounting surface 2Aa is provided only on one side, and its length is doubled. Since the ball return groove lid 2Ad is provided only on one side, the tip surface of the ball return groove lid 2Ad directly contacts the mounting surface 3Aa (not shown) of the opposite ball return piece 3A. Has become.

In the case of such a structure , the ball return groove lid 2Ad becomes longer and the possibility of bending is increased, so that the hole 2 is formed at the tip of the ball return groove lid 2Ad.
Ae is provided, and the mounting surface 3Aa of the ball return piece 3A is provided.
Since the projection 3Af (corresponding to 2Af in FIG. 5) provided at the bottom is inserted, the occurrence of bending can be prevented.

FIG. 6 is a view corresponding to FIG. 1 of another structure , and FIGS.
The difference from the above structure is that the no-load ball return groove 1Bb provided on the slider body 1B side is a groove having a semicircular bottom section and a depth substantially equal to the diameter of the ball 4, and the no-load ball return groove of the ball return groove cover 2Bd. The surface facing 1Bb is a flat surface 2Bc.

FIG. 7 is a view corresponding to FIG. 1 of still another structure , in which the combination surface of the slider body 1C and the ball return groove cover 2Cd and the shapes of the no-load ball return grooves 1Cb and 2Cc provided respectively are different. is there.

In the above structure , the no-load ball return groove has a groove-like shape on the slider body side and a flat or shallow groove-like groove cover on the ball return side. It may be provided as a deep groove on the ball return piece side. In other words, when the slider body and the ball return piece are combined, if the shape is such that a complete no-load ball return path is formed, various combinations are used. can do.

FIG. 8 shows a ball bearing for linear motion according to the present invention .
Plan view of an embodiment of grayed, 9 likewise a front view, FIG. 10 is also a side view, FIG. 11 is a sectional view taken along line C-C of FIG. 8, the structure differs from the embodiment Figures 1-4, Slider body 10
A ball groove piece 11 is provided in addition to the ball return groove lid 12d integrated with the ball return piece 12 on one side 10 '. In these figures, 1
Numeral 0 denotes a slider body, 11 denotes a ball groove piece, 12 and 13 denote ball return pieces, 12d denotes a ball return groove cover, 14 denotes a ball, 15 denotes a rail, 16 denotes a tightening bolt, and 17 denotes a set screw.

The slider body 10 is provided with a loaded ball rolling groove 10a and an unloaded ball return groove 10b, and the ball groove piece 11 is provided on one side 1 of the slider body.
The ball return piece 12 is attached to the recessed portion 0 'with a tightening bolt 16 and has a loaded ball rolling groove 11a and a no-loaded ball return groove 11b.
a, ball reversing part 12b, ball return groove lid part 12d
The ball return piece 13 is mounted on the opposite side of the ball return piece 12 in the moving direction. The rail 15 is provided with a loaded ball rolling groove 15a.
Reference numeral 14a denotes a ball at a position where a load is applied to roll, and 14b denotes a ball at a position where the ball returns without load.

In this embodiment, for example, the slider main body 1 in the structure of FIG. 1 is divided into a slider main body 10 and a ball groove piece 11, and both are fixed by fastening bolts 16. Then, by loosening the tightening bolt 16 and adjusting the push screw 17, the slider body 10, the loaded ball rolling groove 10a or 11a and the ball 4a, and the ball 4a and the loaded ball rolling groove 15a come into contact with no gap. Can be adjusted. That is, the ball return pieces 12 and 13 of this embodiment have a shape that allows a slight lateral movement of the ball groove piece 11.

In this embodiment, since such an adjusting mechanism is provided, it is necessary when such an adjusting mechanism is not provided in a case where a gap is formed or bite by a slight manufacturing variation. No selective fitting is required, and compatibility in the combination of slider and rail does not matter.

[0032]

According to the present invention, it is possible to provide a linear motion bearing in which the processing of the no-load ball return passage is easy, the processing accuracy is good, and the number of processing steps can be greatly reduced.
This has a great industrial effect.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a structure which is prototyped by the applicant and used in the present invention.

FIG. 2 is also an explanatory diagram.

FIG. 3 is a side view of the same.

FIG. 4 is a perspective view of a main part of the same.

FIG. 5 is a perspective view of a main part of a structure obtained by partially changing the structure of FIG . 1 ;

FIG. 6 is an explanatory view of another structure .

FIG. 7 is an explanatory view of still another structure .

8 is a plan view of the solid施例the linear motion bearing of the present invention.

FIG. 9 is a sectional view of the same.

FIG. 10 is a side view of the same.

FIG. 11 is also an explanatory view.

FIG. 12 is an explanatory view of a conventional linear motion bearing.

FIG. 13 is also an explanatory view.

FIG. 14 is also an explanatory view.

[Explanation of symbols]

1 ... Slider body, 1a ... Load ball rolling groove, 1b ...
No-load ball return groove, 2, 3 ... ball return piece, 2a, 3a ... mounting surface, 2b, 3b ... ball reversal part,
2c, 3c ... no-load ball return groove, 2d, 3d ...
Ball return groove lid, 4 ... ball, 4a ... (located at the position where it rolls under load), 4b ... ball (at the position where it returns without load), 5 ... rail, 7 ... ball rolling Passageway 8, No-load ball return passageway.

Continuation of the front page (56) References JP-A-3-113115 (JP, A) JP-A-3-189416 (JP, A) JP-A-1-238714 (JP, A) JP-A-4-248018 (JP) JP-A-5-248433 (JP, A) JP-A-4-46217 (JP, A) JP-A-5-126149 (JP, A) JP-A-63-187721 (JP, U) (58) Field surveyed (Int.Cl. ⁶ , DB name) F16C 29/04-29/06

Claims (1)

(57) [Claims] A slider performs a linear motion by applying a load to a rail and a number of balls while applying a load, and performs a linear motion while rolling between the slider and the rail. In a linear motion bearing having a no-load ball return passage which is fed back in the opposite direction, the slider comprises a slider body, a ball return piece and the ball returner on one side of the rail of the slider body. And a ball groove piece interposed between the load ball rolling groove and the load ball rolling groove on the other side of the rail of the slider body. ,
An unloaded ball return groove having a part of the side surface opened is formed, and the ball return piece has a mounting surface mounted on both front and rear ends in the moving direction of the slider body, and a depth formed on the mounting surface. A ball reversing part for guiding the ball while reversing the direction of the semicircle and reversing the direction of the ball, and a no-load ball return groove which is continuous with the ball reversing part and is partially open; The ball return groove cover portion is formed so as to protrude from a surface, and the ball groove piece has a loaded ball rolling groove partially open on a side surface and the non-loaded ball return partially open. It is formed with grooves, when the ball return piece attached to the slider body through the ball groove piece, said ball return piece及<br/> beauty該Bo - le groove The open portions of the no-load ball return grooves of each of the sliders are joined to face each other to form the completed no-load ball return passage, and the slider body is further connected to the slider body via the ball groove piece. A fastening bolt for fixing a ball return piece, which is provided perpendicular to a plane portion of the slider body, and pressing the ball groove piece from a direction parallel to the plane portion of the slider body, the slider body and the ball A linear motion bearing comprising a groove piece and a push screw for adjusting a position between the ball return pieces.