JPH061839U - Direct acting guide device - Google Patents

Abstract

(57) [Summary] [Purpose] The stopper prevents displacement between the cage and the moving body when used for a long time. The moving body is prevented from protruding outward from the end of the cage, and a constant load capacity is provided over the entire movable region of the moving body. In addition, the straight line accuracy in the operation of the moving body is improved. [Configuration] Between the linear guide rail 1 and the moving body 2,
The cage 3 which can move with respect to both is interposed, and the cage 3
In addition, the direct-acting guide device holds a plurality of balls 9 at intervals in the moving direction. The cage 3 is formed longer than the moving body 2. Stoppers 7 are provided at both ends of the retainer 3 for hitting the movable body 2 and for restricting a moving range of the movable body 2 with respect to the retainer 3. When the moving body 2 reaches the end of the cage 3, it abuts against the stopper 7 and pushes it to move the cage 3 together with the moving body 2.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a direct-acting type guide device used for linear movement of a table such as a semiconductor manufacturing device, OA equipment, and measuring equipment.

[0002]

[Prior art]

 Conventionally, a linear guide rail of this type has been used as a linear guide rail, a moving body that moves along the guide rail, and a guide rail and a moving body that are interposed between the guide rail and the moving body. It is known that there is a cage that can move with respect to each other and a plurality of rolling elements that are held in the cage at intervals in the moving direction.

This direct-acting type guide device can use a relatively large rolling element for the guide rail and the moving body, and is therefore convenient as a miniature type direct-acting type guide device. In addition, since the rolling elements are held in the cage at intervals in the moving direction, adjacent rolling elements do not come into contact with each other, and the rolling elements circulate in the circulation path provided in the moving element. Unlike the guide device, there is no need to reverse the rolling elements, so movement is smooth. Another advantage is that the number of parts is reduced and the manufacturing cost is reduced.

[0004]

[Problems to be solved by the device]

 However, in the conventional linear motion guide device, since the moving speed of the moving body is higher than the moving speed of the cage, a part of the moving body projects from the cage at the end of the moving body in the moving direction, and this Due to this, this protruding part may not be able to receive the load via the rolling element, and as a result, the load is not distributed over the entire moving body, and the load capacity at a specific location in the movable area is reduced. There is a problem that Moreover, there is a problem in that the linearity in the operation of the moving body is lowered due to the reduction of the load capacity at a specific place in the movable area.

An object of the present invention is to provide a direct-acting guide device that solves the above problems.

[0006]

[Means for Solving the Problems]

 The direct-acting guide device according to the present invention includes a linear guide rail, a moving body that moves along the guide rail, and a guide rail and the moving body. A direct-acting guide device comprising a movable retainer and a plurality of rolling elements held in the retainer at intervals in the moving direction thereof, wherein the retainer is formed longer than the movable body. The stoppers are provided at both ends of the cage to restrict the moving range of the moving body with respect to the cage.

[0007]

[Action]

 If the cage is formed longer than the moving body and stoppers are provided at both ends of the cage to restrict the range of movement of the moving body relative to the cage, the moving body is When it reaches the end, it abuts on the stopper and pushes it to move the cage together with the moving body. Therefore, the stopper can prevent the positional displacement between the holder and the moving body when used for a long time. Moreover, the moving body is prevented from protruding outward from the end of the cage, and the moving body can have a constant load capacity over the entire movable region. Further, this makes it possible to improve the linear accuracy in the operation of the moving body.

[0008]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. In the following description, front, rear, left and right refer to the moving direction of the moving body.

1 and 2 show the entire structure of a direct-acting guide device, and FIG. 3 shows a cage.

In FIG. 1 and FIG. 2, the linear guide device is a linear guide rail (1) having a substantially U-shaped cross section, and is arranged in the guide rail (1) and extends along the guide rail (1). The moving body (2) that moves on the right and left sides of the guide rail (1) and the left and right side surfaces of the moving body (2), and the guide rail (1) and the moving body (2). It has a cage (3) that can move relative to (2).

Ball guide grooves (4) are formed on the inner side surfaces of the rising portions (1a) on both the left and right sides of the guide rail (1). Ball guide grooves (5) corresponding to the ball guide grooves (4) of the guide rail (1) are formed on both left and right sides of the moving body (2). Fixed stoppers (6) are provided at both front and rear ends of the guide rail (1) so as to abut the retainer (3) and restrict the movement range of the retainer (3) with respect to the guide rail (1).

The retainer (3) is formed to be longer than the length of the moving body (2) in the front-rear direction, and the retainer (3) of the moving body (2) hits the moving body (2) at both ends thereof. There is a fixed stopper (7) that limits the range of movement with respect to. As shown in FIG. 3, a plurality of hole pockets (8) are formed in the cage (3) at intervals in the front-rear direction, and balls (rolling elements) (9) are provided in each pocket (8). It is put in and held. The inner peripheral surface of each pocket (8) is a concave spherical surface. A ridge (10) extending in the front-rear direction is integrally formed in the upper and lower central portions of the surface of the cage (3) facing the moving body (2) side. Most of the ridges (10) above and below the ridges (10) are cut out so as to be continuous with the pockets (8) at the portions corresponding to the pockets (8), and the remaining portions prevent the balls (9) from falling off. It is part (1 0a). The surface of the fall prevention portion (10a) facing the rising portion (1a) of the guide rail (1) is a concave spherical surface having the same center and the same curvature as the inner peripheral surface of the pocket (8). There is. The ball (9) is adapted to come into contact with the groove surface of the ball guide groove (4) of the guide rail (1) on both the upper and lower sides of the drop prevention portion (10a). The ridge (10) is housed in a relief groove (11) formed in the bottom of the ball guide groove (5) of the moving body (2) and extending in the front-rear direction.

In such a structure, when the moving body (2) moves with respect to the guide rail (1), the cage (3) moves in the same direction as the moving body (2) at a speed substantially half that of the moving body (2). . When the moving body (2) reaches the end of the cage (3), it comes into contact with the stopper (7), and the movement of the moving body (2) with respect to the cage (3) is stopped here. If the cage (3) and the mobile body (2) are misaligned and the mobile body (2) still moves in the same direction after that, the cage (3) will move to the mobile body ( 2) Move with. At this time, all balls (9) roll along both ball guide grooves (4) and (5), so the displacement of the moving body (2) with respect to the cage (3) is It is corrected by sliding. Then, the retainer (3) contacts the stopper (6) of the guide rail (1), so that the movement of the moving body (2) is also stopped.

In the above embodiment, the left and right ends of the left and right cages (3) may be integrally connected. In this case, when the moving body (2) reaches either end during high-speed operation, vibration noise such as chattering noise at the other end is suppressed, and at the time of installation, etc. It is easy to handle.

[0015]

[Effect of device]

 According to the direct-acting guide device of the present invention, as described above, when the moving body reaches the end of the cage, it abuts against the stopper and pushes it to move the cage together with the moving body. To do. Therefore, the stopper can prevent the cage and the moving body from being displaced from each other when used for a long time. Moreover, the moving body is prevented from protruding outward from the end portion of the cage, and the moving body can have a certain load capacity over the entire movable region thereof. Further, this makes it possible to improve the linear accuracy in the operation of the moving body.

[Brief description of drawings]

FIG. 1 is a plan view showing the overall structure of a direct-acting guide device according to the present invention.

FIG. 2 is an enlarged sectional view taken along line II-II in FIG.

FIG. 3 is a perspective view showing a cage.

[Explanation of symbols]

 1 Guide rail 2 Moving body 3 Cage 7 Stopper 9 Ball (rolling body)

Claims (1)

[Scope of utility model registration request] 1. A linear guide rail, a moving body that moves along the guide rail, and a retainer that is interposed between the guide rail and the moving body and that is movable with respect to the guide rail and the moving body. , A linear motion guide device consisting of a plurality of rolling elements held in the cage at intervals in the moving direction, wherein the cage is formed longer than the movable body, and both ends of the cage are formed. A direct-acting guide device, in which a stopper for hitting the moving body and restricting a moving range of the moving body with respect to the retainer is provided.