JPH0517407B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a linear guide device, and more particularly to an improvement of a linear guide device having a bearing damping means.

(Prior Art) A linear guide device includes a rail extending in the axial direction, a saddle-shaped bearing placed over the rail, and a large number of balls interposed between opposing parts of the rail and the bearing. By rolling, the bearing can slide smoothly on the rail. However, since the sliding resistance of the bearing is very small, it is sometimes difficult to stop the bearing at a desired position, and for this reason, a bearing braking means is sometimes provided between the bearing and the rail. As a conventionally used braking means, there is one in which a recess is formed in the inner surface of a bearing and a spring and a friction member are installed in the recess (for example, the Utility Model Application No. 1986-1 filed by the present applicant).
No. 99555). Increasingly, a friction member is pressed against the rail by the action of a spring, thereby applying braking force to the bearing.

(Problems to be Solved by the Present Invention) However, with conventional braking means, it is not possible to hold and retreat the friction material so as not to interfere with the rail before assembling the bearing to the rail. For this reason, when assembling the bearing, tools,
It is necessary to hold and retreat the friction member by hand, which takes time and effort to assemble. Additionally, when transporting or installing the bearing, the friction member sometimes fell off the bearing and was lost.

(Means for Solving the Problems) Therefore, it is an object of the present invention to solve the above problems, and for this purpose, a recess is formed in the inner surface of the bearing, and an insertion hole is formed continuously from the recess to the outer surface. A friction member was mounted in the recess with a spring in between, and a screw member such as a bolt inserted into the insertion hole from the outside of the bearing was screwed into the screw hole drilled in the friction member.

(Function) In this way, when assembling the bearing on the rail, if you turn the screw member and move the friction member backward, there will be no interference between the friction member and the rail, and after assembling the bearing on the rail, When the bolt is turned in the opposite direction and removed from the friction member and bearing, the friction member is pressed against the rail by the action of the spring, and this applies a brake to the movement of the bearing.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

As shown in FIGS. 1 and 2, the rail 10 is an elongated member with a rectangular cross section, and two axial ball rolling grooves 12 are formed in the upper and lower portions of both sides. The rail 10 is fixed to a base or the like (not shown) by bolts (not shown) inserted into bolt insertion holes 14 spaced apart in the longitudinal direction.

On the other hand, the bearing 20 consists of a bearing body 22 having an inverted concave shape, and a pair of end caps 36 fixed to both end faces of the bearing body 22. Two ball rolling grooves 26 are formed on the inner surfaces of the pair of sleeve portions 24 on both sides of the main body 22 in two upper and lower strips facing the ball rolling grooves 12 of the rail 10. Further, a ball return hole 28 is drilled in the sleeve portion 24, and a bolt insertion hole 30 is drilled in a portion protruding outward from the sleeve portion 24 for inserting a bolt for attaching the bearing 20 to a moving table or the like. . The end cap 36 includes a half-doughnut-shaped ball circulation hole (not shown) that communicates the ball return grooves 12 and 26 with the ball return hole 28, and the nipple 38
The lubricating oil supplied from the inside of the circulation hole is arranged so as to be distributed within the circulation hole.

A large number of balls 29 are filled in the ball rolling grooves 12 and 26, the ball circulation hole, and the ball return hole 28.

As shown in FIGS. 3 and 4, a circular recess 42 is formed on the lower surface of the connecting part 40 that connects the sleeve part 24 of the main body 22, and a bolt smaller than the recess 42 is inserted continuously into the lower surface of the connecting part 40. A hole 44 extends upwardly therethrough. A circular friction member 50 having a depth smaller than the depth of the recess 42 is installed in the recess 42 with a disc spring 46 in between, and a screw hole 52 is bored in the center of the friction member 50. A hexagonal socket bolt 54 is inserted into the bolt insertion hole 44, and its threaded portion 56 is screwed into the threaded hole 52 without protruding inward from the friction member 50. Therefore, by rotating the bolt 54, the friction member 50 moves back and forth within the recess 42 and comes out and disappears from the lower surface of the connecting portion 40. In this embodiment, the shape of the recess 42 and the friction member 50 are circular, but due to the friction of the disc spring 46, the friction member 50 does not slip when rotating the bolt 54, but the recess 42 and the friction member 50 are circular in shape. 42 and the friction member 50 may have shapes other than circular, for example, square, oval, etc.

Next, the functions and effects of this embodiment will be explained.

Before assembling the bearing 20 to the rail 10, a tool is engaged with the hexagon hole of the hexagon socket head cap bolt 54 and rotated to bend the disc spring 46 so that the friction member 50 does not interfere with the rail 10 ( The lower surface of the connecting portion 40 is retracted or raised until it is flush with the lower surface of the connecting portion 40 (see FIG. 3).

After assembling the bearing 20 to the rail 10,
Rotate the bolt 54 with a tool. Then, as the bolt 54 rotates, the friction member 50 gradually moves forward or lowers, and its lower surface protrudes downward from the lower surface of the connecting portion 40. When the bolt 54 continues to rotate and is completely pulled out from the friction member 50, the friction member 5
0 is pushed downward by the action of the disc spring 46 and is pressed against the upper surface of the rail 10 to apply braking force to the bearing 10, improving vibration damping without impairing the lightness of rolling (see Figure 4). .

When the bearing 20 moves in either direction on the rail 10 after assembly, the balls 29 roll within the ball rolling grooves 12 and 26. Thereafter, the ball 29 enters the ball return hole 28 from the ball circulation hole, moves in the opposite direction within the ball return hole, and then enters the ball rolling grooves 12, 26 again through the ball circulation hole.

In this embodiment, the bearing 20
When assembling the bearing 2 to the rail 10, the friction member 50 can be held in a state where it does not interfere with the rail 10 with the bolt 54, so there is no need to hold the friction member 50 by hand or with a tool during assembly, and the
There is no possibility that the friction member 50 will fall off or be lost during transportation of the 0. After the bearing 20 is assembled to the rail 10, if the bolt 54 is removed from the friction member 50, the bolt 54 will not interfere with the table, and the sliding friction of the friction member 50 will provide good braking. The action is accomplished.

It should be noted that the above-mentioned embodiment is merely one embodiment of the present invention, and it goes without saying that the present invention should not be construed as being limited thereto. for example,
The shape of the recess 42 and the friction member 50 can be made polygonal, and depending on the type of linear guide device, the retraction direction and number of the friction members 50 can be improved or changed.

(Effects of the Invention) As described above, according to the present invention, in a linear guide device in which vibration damping is achieved by pressing a friction member against a rail, the friction member is held by a bearing and pressed against the rail. This does not interfere with the assembly of the bearing to the rail, which makes the assembly process easier, and also eliminates the possibility of the friction member falling off and being lost when the bearing is being transported. be done.

[Brief explanation of the drawing]

FIG. 1 is a front view of one embodiment of the present invention, FIG. 2 is a side view, and FIGS. 3 and 4 are sectional views of essential parts for explaining the operation of the friction member 50. [Explanation of symbols of main parts], 10...Rail,
20... Bearing, 12, 26... Ball rolling groove, 29... Ball, 42... Recess, 44... Insertion hole, 50... Friction member, 52... Screw hole, 54
...Threaded member, 56...Threaded portion.

Claims (1)

[Scope of Claims] 1. A long rail extending in the axial direction, a saddle-shaped bearing placed over the rail, and balls rolling in rolling grooves formed on opposing surfaces of the bearing and the rail, respectively. a linear guide device including a plurality of balls which can be loaded, the inner surface of the bearing opposite the outer surface of the rail having a recess and a smaller insertion hole continuous with the recess and penetrating to the outer surface of the bearing; A hole is drilled, and a spring member and a friction member having a threaded hole are installed in the recess, and the threaded member is inserted into the insertion hole from the outer surface side of the bearing, and the threaded portion is inserted into the friction member. When the bearing is assembled to the rail, the friction member is moved back to a position where it does not interfere with the rail by rotating the screw member in one direction. At the same time, after the bearing is assembled, the screw member is rotated in the other direction and pulled out from the friction member and the bearing, and the friction member is pressed against the outer surface of the rail by the action of the spring member, and the bearing is removed. A linear guide device characterized by providing a braking force of.