JPS6026816A - Straight operating bearing and its manufacturing method - Google Patents

Abstract

PURPOSE:To reduce a total cost of a straight operating bearing wherein a sliding element is slidably put over a raceway track base via balls by constituting the rolling groove on the sliding element of an arciform rolling face which bears a downward load and a linear rolling face which bears an upward load. CONSTITUTION:An arcilform rolling groove 3 on which balls 2 roll in symmetrical relation on the opposed sides is formed on a raceway track base 1 through its full length in the longitudinal direction. A U-shaped sliding element 4 which spans on the raceway track base 1 has bearing's raceway parts 5 projected at both sides thereof and an arciform rolling groove 6 is also formed on the inner face of parts 5 as opposed to the other rolling groove 3. The rolling face 6b of the rolling groove 6 bearing an upward load is formed to have a linear section. For making the rolling groove 6, a grinding wheel 9 having both an external face 9a having the same curvature as that of the rolling face 6a of the rolling groove 6 and a peripheral flat end face 9b is positioned obliquely. The grinding wheel 9 having a large diameter may be used for grinding and the total cost be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application The present invention relates to a linear drive wheel bridge that can bear loads in four directions, up, down, right and left, and a method for processing the same.

2. Prior Art In general, in mechanical devices that perform linear motion such as tables of machine tools, other side fixtures, and sliding parts of press machines, rolling element circulation type that can take an infinite sliding stroke is used. Linear bearings are often used. This linear motion bearing circulates by interposing rolling elements between a wayway with a rolling surface and a sliding element attached to the device. Conventionally, balls and rollers are used as rolling elements. I am using it.

Fig. 1 shows a conventional example of a ball circulation type linear motion bearing that uses balls as rolling elements. (1) is a long track with a rectangular cross section, and balls (2) are placed at predetermined symmetrical positions on both sides of the track. )(2
) are formed over the entire length in the longitudinal direction. (4) is a U-shaped sliding body that straddles the above-mentioned track base (1), and this is a bearing raceway part (5) (
5), and this bearing 11σ [recessed part (5) (5)
A rolling groove (
3) Corresponding to (3), arc-shaped rolling grooves (6) (6) are formed extending in the longitudinal direction, and these rolling grooves (6) (
The rolling groove (6) (
Drill a ball return hole (7) in parallel with 6),
Both ends of this hole return hole (7) (7) are curved into a U-shape and the open end is rolled/Vj (6) (opened in (i)
I, the ball (2) (
2) The circulation path is well constructed. And this sliding body (4) kl, each rolling groove (3) (3), (6) (6) and o
: 15-ring return hole (7) (7) in a circular arrangement; j
It is slidably straddled over the sushi table (1) via the ζ-rules (2) (2).

Then, when the moving body (4) of the track platform (1) is moved by an appropriate means, the ball (2) & J: each rolling country (3)
(3), ((i) (6) and Ndor return hole (7) (
7), and the sliding body (4) performs linear motion in a predetermined direction along the track (1).

By the way, the above direct motion! □ii In the J receiver, the sliding body (4
) to apply a four-directional load on the bottom left and right,
Rolling motion of moving body (4)? η(G)(6) is the ball(2)
(2) requires 2 points for each, total of 4 points - C1 concubinage. Therefore, compared to the conventional model, we changed the rolling groove (6) of the sliding body (4) to the second
As shown in the figure, the rolling surface (Ga
) (6b) are formed vertically symmetrically. Therefore, the load can be applied equally in all four directions. However,
If the rolling groove (6) of the sliding body (4) is formed with the rolling surfaces (6a) and (6b) having two centers of curvature symmetrically, the rolling groove (6) will not be formed in the actual machining. As shown in Figure 3, the grinding process G) is carried out using a small-diameter grindstone (8) with a small grinding force.
), the grinding process was forced to be inefficient, and the grinding process took a lot of time, which resulted in a high total manufacturing cost.

Purpose of the Invention This invention significantly improves grinding efficiency and shortens machining time by grinding the rolling grooves of a sliding body with a large-diameter grindstone that has a large grinding capacity. The present invention provides a linear motion bearing and a method for machining the same, which allows the bearing to be lowered.

21 Structure of the Invention This invention provides a wayway in which rolling grooves are formed over the entire length on both side surfaces, and a bearing raceway integrally formed on both sides, each of which has inner surfaces corresponding to the rolling grooves ID of the wayway. The sliding body has a rolling groove formed therein and a ball circulation path around the rolling groove, and balls arranged and held in the rolling groove and the ball circulation path of the sliding body, In a linear motion bearing in which the sliding body is movably straddled over the way via the balls, the rolling groove of the sliding body is connected to the arc-shaped rolling surface that applies a downward load and the upper The linear rolling surface that applies a directional load, the gap, and the linear rolling surface are formed symmetrically (H, 1), and the above-mentioned both middle and 5 running surfaces are formed on the outer peripheral surface and the peripheral edge (F, 1) of the grinding wheel.
1. The three Mj surfaces are ground at the same time.

Embodiment 5S4 and 5 are examples of the linear motion bearing of this invention.
The difference from the conventional example shown in Fig. 1 is that the rolling groove (
6) The cross-sectional shape of the rolling surface (6b) that applies an upward load is formed into a straight line, which allows the sliding body (4) to
of the rolling groove (6)! i7F machining is possible with a large diameter grindstone.

By the way, in the linear motion bearing of the present invention, the balls (2) come into rolling contact with the planar raceway surface (6b) in response to an upward load, and the load capacity of the raceway surface (6b) decreases. ,
For the following reasons, in the case of large forces, a decrease in the load capacity of downward loads is not a problem. In other words, if we consider the conditions under which this type of linear motion bearing is used, most of them are used for linear sliding motion between the bed and the table, and in that case, 80 to 90% of the load is in one direction. The load is downward and left and right, and almost no load is applied upward. Further, even if an upward load is applied, it is offset by the weight of the table and is much smaller than a downward load.

FIG. 6 is a schematic diagram showing the process of machining the rolling groove (6) of the sliding body (4) using the machining method of the present invention.
A grindstone (9) having an outer circumferential surface (9a) having the same curvature as the rolling surface (6a) of the grindstone (9) and a planar peripheral end surface (9b) is arranged in an inclined manner, and the outer circumferential surface (9a) of the grindstone (9) is arranged in an inclined manner. and the rolling surfaces (6a) and (6b) of the rolling groove (6) on the peripheral edge side end surface (9b).
) are simultaneously ground.

In this way, the grinding wheel (9) is arranged in an inclined manner, and the rolling surfaces (6a) and (6b) of the rolling groove (6) are simultaneously ground with its outer circumferential surface (9a) and peripheral end surface (9h). If you do this,
The grindstone (9) can be made larger in diameter, (iH machining fi
The L rate can be greatly improved and the machining time can be significantly shortened by t1?1. FIG. 7 shows another embodiment of the invention, in which the sliding body (4)
The rolling groove (6b) of the rolling groove (6b) is connected to the rolling groove R (C
The rolling surface (6b) is formed in an arc shape close to a straight line and has a radius of curvature much larger than the radius of curvature of +a).
The grinding wheel (9) is ground by a substantially linear arcuate conical surface (9c) with a large radius of curvature formed on the outer peripheral edge of the side surface of the grindstone (9).

1. Effects of the Invention This invention provides a rolling groove formed on both side surfaces over the entire length.
! (T > n units, and a bearing raceway integrally formed on both sides has a rolling groove formed on each inner surface corresponding to the rolling groove of the way, and ball circulation around the rolling groove. It consists of a sliding body with a path formed therein, and balls arranged and held in rolling grooves and ball circulation paths of the sliding body, and the sliding body is slidably straddled over the track via the balls. In the linear motion bearing, the raceway groove of the sliding body is composed of an arcuate raceway surface that applies a downward load and a linear or substantially linear raceway surface that applies an upward load; Since the above-mentioned two rolling surfaces are simultaneously ground by the outer circumferential surface and the peripheral end surface of the grindstone, it is possible to perform the grinding process using a large diameter grindstone with a large grinding capacity, and the grinding process capacity is greatly improved. It is possible to significantly shorten processing time and lower the cost of manufacturing 1 hectal.

[Brief explanation of drawings]

Figure 1 is a sectional view showing a conventional straight J bearing, Figure 2 is an enlarged view of its main parts, and Figure 3 is a schematic diagram showing the state when the rolling groove of a sliding body is machined using the conventional machining method. Fig. 4 is a sectional view showing an embodiment of the linear motion bearing of the present invention, Fig. 5 is an enlarged view of the main part thereof, and Fig. 6 is a machining of rolling grooves of a sliding body by the processing method of the present invention. FIG. 7 is a schematic diagram showing the state of n4, and FIG. 7 is a schematic diagram showing main parts of another embodiment of the present invention. (1) - track base, (2) - ball, (3) - rolling groove,
(4,)-moving body, (5)-bearing → sushi side, (6L-
Rolling groove, (6a> (13b) - Rolling surface, (7L--
One ball return hole, (9) - grindstone, (9a) - outer circular surface,
(911) - Peripheral side end surface.

Claims (1)

[Scope of Claims] (11) A GT track having rolling grooves formed over the entire length on both sides, and a bearing raceway integrally formed on both sides, each having inner surfaces corresponding to the rolling grooves of the way. a sliding body in which a rolling groove is formed and a ball circulation path is formed around the rolling groove;
In the linear motion bearing, which comprises balls arranged and held in a rolling groove and a ball circulation path of the sliding body, and in which the sliding body is slidably straddled on the track base via the balls, the above-mentioned The rolling groove of the sliding body is configured with an arcuate raceway surface that applies a downward load and a linear or substantially linear raceway surface that applies an upward load, and is formed vertically asymmetrically. Direct-acting bearing. (2) A wayway with raceway surfaces formed over the entire length on both sides, and a bearing raceway integrally formed on both sides, with raceway grooves corresponding to the raceway grooves of the wayway on each inner side. and a ball circulation path formed around the rolling groove, and balls arranged and held in the rolling groove and the ball circulation path of the sliding body. In the processing method of a linear motion bearing in which the sliding body is slidably straddled through the sliding body, the rolling surface of the rolling groove of the sliding body applies a downward load, and the rolling surface applies an upward load to a cart. A method for processing a linear motion bearing, characterized in that the surface is simultaneously ground on the outer circumferential surface and the peripheral end surface of a grindstone.