JPS6161935B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sliding member (hereinafter referred to as
This invention relates to a table device with a linear ball bearing that guides a table (referred to as a table).

When installing a conventionally known linear ball bearing unit (see Japanese Patent Application Laid-open No. 72912/1983) on a table, steps are formed on the front, back, left and right sides of the table, and the unit is mounted on the steps. In addition, there were problems in that errors occurred, installation space was required, and since the track was installed below the bearing, it was high, the point of application of the load was high, and it was difficult to make the entire system compact.

The technical problem of the present invention is that by forming a linear ball bearing directly on the outside of the table, it eliminates the conventional installation error, enables highly accurate linear guidance, is compact and lightweight, and also prevents radial loads in the vertical direction. The radial load (lifting load) and the horizontal left and right loads can be made almost equal, and the ball load that acts on the upper and lower two rows of balls that are sandwiched by the upper and lower rows of load ball raceway grooves. The object of the present invention is to provide a table device with a linear ball bearing in which the intersection of the lines of action of is located on the track base.

The structure of the present invention, that is, the technical means for solving the above technical problem is as follows.

Equipped with a linear ball bearing in which two rows of upper and lower raceway grooves are formed directly on the outside of the table in the axial direction, and two rows of upper and lower relief ball holes are passed through in the axial direction in parallel to the two rows of upper and lower raceway grooves. In the table device, U-shaped grooves for direction conversion that communicate the raceway groove and the escape ball hole are formed in two rows, upper and lower, in side covers fixed to both end surfaces of the table, and are fixed to the outside of the table. The retainer has two rows of upper and lower slits formed in correspondence with the two rows of upper and lower raceway grooves, and a large number of balls are arranged in the raceway groove, the retainer, the escape ball hole, and the U-shaped groove for direction change. , two rows of upper and lower raceway grooves are formed on a track base disposed close to the outside of the table, corresponding to the two rows of upper and lower raceway grooves formed directly on the table, and two rows of upper and lower raceway grooves are formed directly on the table. The intersection of the line of action of the ball loads acting on the two rows of upper and lower balls held by the raceway grooves and the two rows of upper and lower rows of raceway grooves formed on the way is on the way.

The above technical means works as follows.

In other words, since the linear ball bearing is formed directly on the outside of the table, it can be guided in a straight line with high precision, eliminating installation errors when installing the linear ball bearing unit on the table, and does not require installation space, making it compact and lightweight. It has the effect of being able to be thinned and to reduce manufacturing costs.

In addition, the intersection of the lines of action of the ball loads acting on the upper and lower two rows of balls held by the upper and lower two rows of raceway grooves formed directly on the outside of the table and the upper and lower two rows of upper and lower raceway grooves formed on the way base is the Because it is configured so that it is on the stand side, it is possible to make the vertical radial load and reverse radial load (lifting load) and the horizontal left and right loads almost equal. It can also have a bearing function that can sufficiently withstand against.

Embodiments of the present invention will be described below with reference to the drawings. Reference numeral 10 denotes a table made of steel, and the table 10 has notches 10', 10' formed in the axial direction at the lower part of the outside thereof.

Raceway grooves 11 and 12 having a radius of curvature substantially the same as the diameter of the direct ball are formed in two rows in the axial direction in the notch 10'.

The relief ball holes 13 and 14 are spaced apart from the raceway grooves 11 and 12 by a predetermined distance, and are axially penetrated in two rows, upper and lower, parallel to the raceway grooves 11 and 12.

The table 10 also has side cover mounting holes 15 and 1 for fixing a side cover 30, which will be described later, on the end surface of the table 10.
6. A mounting hole 17 for mounting a heavy object such as a workpiece is formed on the top surface of the table, and an inverted U-shaped groove 18 is formed at the center of the lower part of the table for arranging a feed screw, cylinder, etc., respectively.

20 is a ball, and out of 20 balls, 2
1 and 22 are load balls rolling in raceway grooves 11 and 12, and 23 and 24 are escape ball holes 13 and 14.
It is a no-load ball that rolls around.

Reference numeral 30 denotes an inverted L-shaped side cover fixed to both the front and rear end surfaces of the table 10, and the side cover 30 is molded by die-casting or injection molding using die-cast alloy or synthetic resin material.

The side cover 30 has two rows of upper and lower U-shaped grooves 31 for direction conversion,
32, the upper U-shaped groove 31 for direction conversion communicates the upper raceway groove 11 and the escape ball hole 13,
Further, the lower U-shaped groove 32 for direction conversion communicates the lower raceway groove 12 and the relief ball hole 14 .

The V-shaped groove 35 formed between the direction-changing U-shaped grooves 31 and 32 has vertically inclined sides, and
A substantially triangular protruding piece 36 that can protrude inward is formed in the groove 35, and there is a sufficient gap between the lower surface of the protruding piece 36 and the V-shaped groove 35 to hold a retainer 40, which will be described later.

In addition, the side cover mounting hole 1 of the table 1 is provided in the side cover 30.
Through holes 33 and 34 that coincide with holes 5 and 16 are formed, and a seal lip 37 made of an elastic material that slides into contact with the top and side surfaces of the track base 50, which will be described later, is attached.

Reference numeral 40 denotes a cage formed by bending a steel plate into a V-shape, and both ends of the cage 40 are fixed to notches 10' formed on the outside of the table 10, and are formed inside the side lid. The V-shaped groove 35 and the locking piece 36 cooperate to securely hold the front and rear of the retainer.

The retainer 40 has two rows of upper and lower raceway grooves 11 and 12.
Correspondingly, two rows of upper and lower slits 41, 42 are formed with a width that prevents the load balls 21, 22 from falling out, and tongue pieces 43, 42 are provided at both ends of the slits 41, 42.
44 are formed respectively.

These tongue pieces 43, 44 are connected to the load balls 21, 2
2 guides the ball 20 when it is converted into the unloaded balls 23, 24 or from the unloaded balls 23, 24 to the loaded balls 21, 22, respectively.

Reference numeral 50 designates a track base disposed close to the outside of the table 10. The track base 50 has a protrusion 50' formed in the axial direction on the table 10 side, and two rows above and below the protrusion 50'. raceway grooves 51 and 52 are formed.

The upper raceway groove 51 corresponds to the upper raceway groove 11, and the load ball 2 is placed between the raceway groove 11 and the raceway groove 51.
1 is held.

The lower raceway groove 52 corresponds to the lower raceway groove 12, and the load ball 2 is placed between the raceway groove 12 and the raceway groove 52.
2 is held.

The lines of action of the ball loads acting on the load balls 21 and 22 are formed so as to form a contact angle of approximately 45 degrees, and the intersection point P of the line of action of the load on the load balls 21 and the line of action of the load on the load balls 22 is It is formed so as to be on the track platform 50 side.

The track 50 also has a through hole 53 for attaching the track and a side groove 54 formed in the axial direction.

60 is a bed, and on both sides there are tracks 50,
shoulders 61, 61 for positioning and arranging 50;
Attachment holes 62 that match the through holes 53 are formed, respectively.

Reference numeral 63 denotes a clearance adjustment member interposed between the shoulder portion 61 and the track 50, and the clearance adjustment member 63 adjusts the radial clearance in the vertical direction and the horizontal direction formed between the table 10, the ball 20, and the track 50. The left and right clearance can be adjusted.

70 is a two-pronged seal plate fixed to the outside of the table 10 by a mounting bolt 75;
0, the inner seal plate 71 is placed on the side surface of the table 10, and a seal lip 72 made of an elastic material is attached to its inner end.

The seal lip 72 slides on the upper surface of the track 50.

Further, the outer seal plate 73 extends to the outside of the track base 50, and its inner end 74 fits into the side groove 54 of the track base 50 to form a labyrinth seal.

Reference numeral 80 denotes a sealing plate with a sealing lip fixed to the lower part of the notch 10' formed on the outside of the table 10, and the sealing lip made of an elastic material of the sealing plate 80 comes into sliding contact with the inside of the track base 50.

The table device with a linear ball bearing of the present invention is constructed as described above, and in particular, the order of assembling the linear ball bearing directly formed on the outside of the table 10 will be explained below.

First, the retainer 40 is installed and fixed in the notch 10' on the outside of the table 10.

Next, attach the mounting bolt 3 to one end of the table 10.
5 and 36, and the front and rear of the retainer 40 are held through the V-shaped groove 35 and the locking piece 36.

After that, a predetermined number of balls 20 escape from the ball hole 1.
3 and 14, and finally the other side cover 30 is attached to the other end of the table 10 and fixed via bolts 35 and 36, completing the assembly of the linear ball bearing.

Next, a table with a linear ball bearing is assembled into the track base 50 attached to the bed 60.

The operating state of the table device with linear ball bearing of the present invention will be explained.

When the table 10 moves straight along the track 50, the track grooves 11 and 12 of the table 10 and the track 5
The load balls 21 and 22 held between the raceway grooves 51 and 52 of the retainer 40 are
42, and is guided by the tongue pieces 43, 44 provided in the slits 41, 42 of the retainer 40 so as to be scooped up from the linear direction to the rotational direction, and the U-shaped groove 31 for direction change of the side cover 30 ,32
through the escape ball holes 13 and 14 of the table 10.
The balls are fed into the ball and become unloaded balls 23 and 24.

Furthermore, the unloaded balls 23 and 24 pass through the direction changing U-shaped grooves 31 and 32 of the other side cover 30, pass through the tongue pieces 43 and 44 of the retainer 40, and circulate to the slits 41 and 42 of the retainer 40. And load ball 21,2
It becomes 2.

In this way, the ball 2 of the linear ball bearing
Since the table 10 continues its circular motion, the table 10 is smoothly and easily linearly guided along the track.

Since the table device with a linear ball bearing of the present invention has the above-described configuration, it exhibits the following effects.

Since linear ball bearings are formed directly on the outside of the table, by setting the table in the center of the work table of the grinder, both grooves can be ground simultaneously and a large grindstone can be used. Therefore, efficiency is further improved,
At the same time, a highly accurate raceway groove is formed.

Also, unlike installing bearings on the front, back, left and right sides of the table, partial distortion is eliminated, and highly accurate linear guidance is possible, eliminating installation errors when installing linear ball bearing units on the table as in the past. In addition, it does not require any special space for installation, making the entire structure compact and lightweight, which also helps reduce costs. The intersection of the lines of action of the ball loads acting on the upper and lower two rows of balls held by the upper and lower two rows of raceway grooves formed directly on the outside of the table and the upper and lower two rows of raceway grooves formed on the wayway is on the wayway. Since the configuration is as shown in , it is possible to make vertical radial loads and reverse radial loads (lifting loads) and horizontal left and right loads almost equal, and furthermore, it is possible to make the radial loads and reverse radial loads (uplifting loads) approximately equal in the vertical direction, and also to make the load in the moment load and torque direction almost equal. It's bearable enough.

[Brief explanation of the drawing]

The drawings show an embodiment of a table device with a linear ball bearing according to the present invention, in which FIG. 1 is an overall front view, FIG. 2 is a front sectional view, and FIG. 3 is a view of FIG.
4 is a partially omitted sectional view taken along the line of FIG. 2, and FIG. 5 is a perspective view of the side cover.
FIG. 6 is a front view of the cage. 10...Table, 11, 12...Race groove, 13,
14... Relief ball hole, 20... Ball, 30... Side cover, 31, 32... U-shaped groove for direction conversion, 40... Retainer, 41, 42... Slit, 43, 44... Tongue piece,
50...Railway base, 51, 52...Race groove.

Claims (1)

[Scope of Claims] 1 Directly on the outside of the table 10, upper and lower two rows of load ball raceway grooves 11 and 12 are formed in the axial direction, and upper and lower two rows of relief ball holes 13 and 14 are formed in the upper and lower rows. In a table device with a linear ball bearing, which is axially penetrated in parallel with the raceway groove of the table, (A) side lids 30 fixed to both end surfaces of the table;
U-shaped grooves 31 and 32 for direction conversion, which communicate the load ball raceway grooves 11 and 12 and the relief ball holes 13 and 14, are formed in two rows, upper and lower. (B) A retainer 40 fixed to the outside of the table 10 via the side cover 30 has upper and lower rows of slits 41 and 42 corresponding to the upper and lower rows of load ball raceway grooves 11 and 12, and slit 41,
A tongue piece 43 is formed before and after 42. (C) Load ball raceway groove 1 of the table 10
1, 12, the retainer 40, the escape ball holes 13, 14, and the U for changing the direction of the side cover 30
A large number of balls 21 and 22 are arranged in a circulation path formed by grooves 31 and 32. (D) On the upper and lower sides of the convex portion 50 of the track 50, which is arranged close to the outside of the table 10 with the load balls interposed therebetween, there are two upper and lower parts corresponding to the load ball raceway grooves 11 and 12 formed on the table. Rows of load ball raceway grooves 51 and 52 are formed. (E) Clamped by upper and lower two rows of load ball raceway grooves 11 and 12 formed directly on the outside of the table 10 and upper and lower two rows of load ball raceway grooves 51 and 52 formed on the track base 50. The intersection point P of the lines of action of the ball loads acting on the upper and lower two rows of balls 21 and 22 is on the track base 50 side. A table device with a linear ball bearing, characterized in that it consists of the above components A, B, C, D, and E.