JPH03117718A - Gap adjusting method for linear slide bearing - Google Patents

Abstract

PURPOSE:To adjust pre-load after assembling by making a ball size larger than a facing ball groove gap on a track support and a slide base to thrust and elastically transform the upper face of the slide base with gap adjusting thrust bolts threaded to a mounting base mounted on the track support. CONSTITUTION:With a linear slide bearing B, between a rolling groove 10 in a track support 2 and a load ball groove 8 in a slide base 1, balls 4 with the size larger than a gap between them are laid. A mounting base 12 is mounted on the horizontal portion 5 of the slide base 1 with fastening bolts 13 to form a gap D on a recessed face 15. On a center line at the middle of a mounting face 11 gap adjusting thrust bolts 16 are threaded to thrust the horizontal portion 5. Such thrust causes the slide base to be elastically transformed to widen a gap (d) between a sleeve portion 6 and the track support 2. In this way, pre-load given to the balls 4 is adjusted into a preset value. The adjustment can be easily made after the bearing is assembled in a machine device.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention relates to a linear sliding bearing that linearly guides a movable body to be slid in a sliding part of a machine tool such as an NC machine or an industrial robot. In particular, adjusting the pressurization of the balls that carry the load between the sliding table and the track that make up the bearing, or adjusting the gap between linear sliding bearings to smooth the rolling of the balls. Regarding the method.

[Conventional technology]

A linear sliding bearing usually includes a sliding base having a substantially inverted C-shaped cross section with a recess on the lower surface side, and a track base whose upper part is fitted into the recess of the sliding base while maintaining a predetermined gap. It has a large number of balls that circulate within the pole endless track formed on the sliding table, and these balls perform linear reciprocating motion along the track while applying vertical and horizontal loads acting on the sliding table. It is designed to guide you.

Such linear sliding bearings are required to be able to be incorporated with high precision into the sliding parts of general industrial machinery, and to have good positioning and repeatability, and to have a long life. In order to give such characteristics to It is important to set the diameter of the ball to be negative compared to the diameter of the ball mentioned above, thereby applying pressurization to the balls to increase the hit rate of all balls, and to prevent hammer action and prying loads caused by the moment of inertia when changing direction. It is also important that each ball circulating in the ball endless track smoothly circulates from its no-load area to its loaded area or from its loaded area to its no-load area.

For this reason, in the past, as a means of applying pressurization to the balls, the balls were selected and fitted with the same diameter, using pole selection fitting, or grooves were formed in the sleeves of the sliding base. Methods such as adjusting the gap between the slide table and the track base using bolts are also used, and as a means of smoothing the circulation of the balls within the ball endless track, the load ball of the slide base is A so-called crowning process, in which the grooves are widened at both ends and narrowed at the middle, is performed.

[Problem to be solved by the invention]

However, ball selective fitting, which is performed as a means of applying pressurization to the balls, is extremely time-consuming work, and ball selective fitting and gap adjustment performed from the side of the slide table do not allow the bearing to slide into the machine. There is a problem in that it is difficult to adjust the pressurization applied to the balls depending on the purpose of use of the bearing, and it is also difficult to crown the load ball groove of the sliding table. There was a problem in that the process required to finish the process with high precision was extremely time-consuming.

[Means to solve the problem]

The present invention has been made in view of this point of view, and the ball diameter is selected to be larger than the distance between the load ball groove and the rolling groove that face each other, and the upper surface of the horizontal part of the slide table is provided with two sleeves. A pair of mounting surfaces are formed along the upper longitudinal direction, and a mounting base is attached to the pair of mounting surfaces using a plurality of fastening bolts. A gap is formed between the two mounting surfaces, and a gap adjusting press bolt that passes through the mounting base and contacts the horizontal portion at an intermediate position between the pair of mounting surfaces is screwed into the mounting base, and the gap adjusting press bolt is rotated. The feature is that the horizontal part is pressed by pressing the horizontal part.

[For production]

According to such technical means, a preload is applied to the balls sandwiched between the load ball groove of the sliding table and the rolling groove of the wayway from the beginning, but the above-mentioned clearance adjustment press bolt is By rotating and pressing the horizontal part of the slide table, the gap between the inner surface of each sleeve part of the slide table and the outer surface of the track base is widened, reducing the preload applied to the ball, and , this can be adjusted.

〔Example〕

EMBODIMENT OF THE INVENTION Hereinafter, the gap adjustment method of the linear sliding bearing of this invention will be specifically demonstrated based on an accompanying drawing.

1 to 5, a linear sliding bearing B to which an embodiment of the method of the present invention is applied is shown. This bearing B has a horizontal portion (5) and a pair of sleeve portions (6) hanging downward from both sides of the horizontal portion (5), and has a trapezoidal recess (7) on the lower surface side. An escape ball having a substantially semicircular load ball groove (8) along the longitudinal direction of the inner surface of the portion (6) and forming an escape ball trajectory (9) corresponding to each of these load ball grooves (8). A sliding base (1) having a substantially inverted C-shaped cross section and a hole (9a) formed therein, and a recess (7) of the sliding base (1) having a trapezoidal upper part with a predetermined gap between them. a substantially semicircular rolling groove 00) which is fitted while maintaining the same and corresponds to the load ball groove (8).
A track base (2) having a slide base (11) is attached to both the front and rear end surfaces of the slide base (11), and on the inner surface, the load ball groove (8) and the escape ball hole (9a) are connected to communicate with each other. a pair of lids (3) having guide grooves (not shown) that form a ball endless track;
A large number of balls (4) that apply a load between the load ball groove (8) of the sliding table (1) and the rolling groove Go of the wayway (2)
It is made up of.

As shown in FIG. 1 and FIGS. 3 to 5, on the upper surface of the horizontal part (5) of the sliding table (1), there is a pair of mounting surfaces ( 11) are formed, and mounting stands (
1) is provided with a mounting hole (14) into which the fastening bolt (13) is screwed when installing the horizontal part (5).
A concave surface (15) is formed on the upper surface so that a predetermined gap is formed between each of the mounting surfaces (11) and the lower surface of the mounting opening.

In addition, the mounting base (one is □) is located between the pair of mounting surfaces (11) that pass through the mounting base (121) and are formed on the upper surface of the horizontal part (5) of the sliding base (1). Three gap adjusting press bolts 1-(16) (hereinafter referred to as press bolts) that abut this horizontal portion (5) above the horizontal portion center line! are screwed together.

Furthermore, the diameter of the ball (4) is selected to be larger than the distance between the load ball groove (8) of the slide table (1) and the rolling groove (10) of the way table (2), which face each other. Therefore, a preload is applied when the ball is inserted between the load ball groove (8) and the rolling groove (lO).

In addition, the reference numeral (1110) in FIGS. 1 to 4 above is a bed having a mounting reference surface (19) when fixing the track (2) of the bearing B to various mechanical devices,
In the figures and Fig. 5, the symbol ■ indicates that the lid body (3) is
) is a mounting bolt that is fixed to both the front and rear end surfaces of the press bolt (+61 (16
A) is the contact position indicating the position where the slide table (1) contacts the upper surface of the horizontal portion (5).

Next, regarding the bearing (B) according to this example, we will explain how to assemble it to various mechanical devices and its sliding base (1) and track base (
2) How to adjust the gap (dl) between

First, the track base (2) is fixed to the mounting reference surface (19) of the bed (1 (A)) of various mechanical devices, and the bearing B is installed on the horizontal part (5) of the slide base (1). Place the mounting base (1) on the mounting surface (II) formed in
Fix the diagram.

After installing the bearing B in this way, tighten each pressure bolt (16) from above the mounting base opening while observing the sliding condition of the bearing B.
) Apply a pressing force in the direction of arrow Y to the upper surface of this horizontal part (5
) is given elastic deformation as shown by the two-dot chain line in Fig. 6 to widen the distance between both sleeves (6) of the sliding table (1),
As a result, the original gap d between the inner surface of each sleeve portion (6) of the slide table (1) and the outer surface of the track base (2) is widened to d.

In this way, by applying elastic deformation to the horizontal part (5) of the sliding table (1) as shown in FIG.
The distance between the load ball groove (8) formed on the inner surface of each sleeve portion (6) and each rolling groove (lO) formed on the outer surface of the track base (2) is made close to the diameter of the ball (4). , or slightly wider, thereby reducing the preload of each ball (4) rolling in the loaded ball groove (8) and adjusting the preload to a predetermined value.

Moreover, FIGS. 7 and 8 show modified examples of the linear sliding bearing B to which the method of the present invention is applied. The bearing B in FIG. 7 has a sliding base ( 1) is shown, and the bearing B shown in FIG. The loaded ball groove (8) is formed in a substantially semi-elliptical shape, and the escape ball track (9) is composed of a deep groove (9b) formed along the longitudinal direction of the inner surface of the recess (7). Further, a ball holder (25) is provided on the inner surface of the recess (7), and together with guide grooves provided on the front and rear lids (not shown), two pairs of ball endless tracks are formed, In addition, the track base (2) is provided with protrusions (26) on both shoulders and rolling grooves [10] on both sides thereof, so that the balls ( 4) The above protrusion (26)
It is designed to sandwich the .

Regarding the bearing B of each of these modified examples, in exactly the same way as in the case described above, the pressure bolt (16) is used to connect the inner surface of each shaft part (6) of the sliding table (1) and the outer surface of the track table (2). This can be adjusted by widening the gap d and reducing the pressurization of each ball (4) in the load area.

The arrangement and number of the fastening bolts (13) and pressing bolts f16) are such that the gap between the inner surface of each sleeve of the sliding table and the outer surface of the track base can be widened by rotation of the pressing bolts. The invention is not limited to the above embodiments.

〔Effect of the invention〕

As explained above, according to the method for adjusting the clearance of a linear sliding bearing of the present invention, the clearance adjustment suppressing bolt is rotated to press the horizontal part of the sliding table, and the inner surface of each sleeve part of the sliding table is pressed. Since the gap between the bearing and the outer surface of the track base has been widened, after the bearing has been assembled into various mechanical devices, the gap adjustment press bolt can be turned from above the mounting base to increase the gap that has been attached to the ball in advance. The preload can be reduced and adjusted, and the preload on the bearing can be reduced by selective fitting of balls, which is very time-consuming, and by adjusting the gap from the side of the slide table, which is difficult in terms of miniaturizing mechanical devices. There is no need to make adjustments.

[Brief explanation of drawings]

FIG. 1 is a front view showing an assembled state of a linear sliding bearing to which a gap adjustment method according to an embodiment of the present invention is applied, FIG. 2 is a side view of FIG. 1, and FIG. 3 is a side view of FIG. 1. Plan view of 4th
The figure is a sectional view taken along the line IV-IV in Figure 3, Figure 5 is a plan view of the bearing with the mounting base removed from Figure 3, and Figure 6 shows the state of elastic deformation of the horizontal part of the sliding base. The exaggerated front explanatory view, FIGS. 7 and 8 are sectional views similar to FIG. 4 showing a modification of the linear sliding bearing to which the method of the present invention is applied. [Explanation of symbols] B: Bearing (1): Sliding base (2): Track base (3): Lid (4) Two balls (5): Horizontal part (6): Shaft part (
7): Recess (8): Load ball groove (9): Relief ball track (9a): Relief ball hole (9b): Deep groove 0
ω: Rolling groove OD; Mounting surface decoy: Mounting base (13: Fastening bolt (161: Gap adjustment press bolt l: Horizontal center line d: Gap D2 gap

Claims (1)

[Scope of Claims] It has a horizontal portion and a pair of sleeve portions that hang downward from both sides of the horizontal portion, and has a recessed portion on the lower surface side, and the both sleeve portions are loaded along the longitudinal direction of the inner surface thereof. A sliding table having a substantially inverted C-shaped cross section and having ball grooves and relief ball trajectories corresponding to each of these load ball grooves, and an upper portion thereof are fitted into a recessed portion of the sliding table while maintaining a predetermined gap from each other. At the same time, a track base having rolling grooves corresponding to the load ball grooves is attached to both the front and rear end surfaces of the slide base, and on the inner surface, a track base is installed between each end of the load ball groove and the relief ball raceway. A pair of lids having guide grooves that are connected to each other to form a ball endless track, circulate within the ball endless track, and load a load between the load ball groove of the sliding base and the rolling groove of the way base. In a linear sliding bearing consisting of a large number of balls, the diameter of the balls is selected to be larger than the distance between the load ball groove and the rolling groove, which face each other, and the upper surface of the horizontal part of the sliding table has both sleeves. A pair of mounting surfaces are formed along the upper longitudinal direction, and a mounting base is mounted on these pair of mounting surfaces with a plurality of fastening bolts, so that each of the mounting surfaces is formed between the upper surface of the horizontal part and the lower surface of the mounting base. forming a gap located between
A clearance adjustment pressing bolt that passes through the mounting base and contacts the horizontal portion at an intermediate position between the pair of mounting surfaces is screwed onto the mounting base, and the clearance adjustment pressing bolt is rotated to press the horizontal portion. A method for adjusting the gap of a linear sliding bearing, which is characterized by: