JPS6135776Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a track mounted on the lower surface of a movable table, and more specifically, a track groove for guiding a bearing block via a ball on one side of the track mounted opposite to each other. The present invention relates to a track base in which a rack is formed on the other side and a rack is formed on the other side to mesh with a driving pinion.

Conventional track bases only have track grooves that guide the bearing blocks, so the movable table moves forward and backward by fixing a hydraulic cylinder approximately in the center of the bed, and fixing one end of the piston rod to the movable table side. Then, the shaft of the ball screw is attached to a joint of a rotating mechanism such as a motor on the bed, and the nut side is fixed approximately at the center of the movable table, and the shaft is It must be done by rotation.

The installation of a hydraulic device or a mechanical drive mechanism such as a ball screw makes the entire device expensive and requires troublesome maintenance.

The technical problem of the present invention is to effectively utilize a long track base without requiring any hydraulic equipment as described above.

In other words, a raceway groove for guiding the bearing block is formed on one of the left and right track bases that are installed opposite to each other on both sides of the lower surface of the movable table, and engages with the drive pinion on the unprocessed surface of the other side wall. The rack is formed over the entire length or a required length. This makes it possible to provide a low-cost product with a simple drive mechanism.

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

In a track base in which recesses are formed on both sides of a bar, two raceway grooves are formed at required positions above and below one protrusion formed by the recess, and a rack is formed on the other protrusion. It lies in being.

The above technical means provides the following effects. A reference plane is taken on one track base, and a raceway groove is formed on one protrusion from the reference plane, and a rack is formed on the other protrusion, so the parallelism between the raceway groove and the rack is Often, the way is mounted on the table side, the bearing block incorporated into the raceway groove of the way is mounted on the bed side, and the pinion that meshes with the rack is rotatably mounted on the bed side, so that the preload is reduced. It is possible to prevent backlash on average when the table is applied, and since the parallelism is good, there are no abnormal friction parts, and the table can be moved forward and backward accurately and smoothly.

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

Reference numeral 10 generally refers to a track made of a material with excellent toughness and wear resistance, such as a bar (steel material). A lower flat surface 19 and side vertical end surfaces 12, 12 are formed, and these upper flat surface 11 and side vertical surfaces 12 are used as reference surfaces.

By using the upper flat surface 11 as a reference surface and forming recesses a and b having a substantially square cross section on the left and right side vertical surfaces 12, 12, the upper and lower inclined surfaces 13, 14, 15,
16 and vertical surfaces 17, 18 are formed in the axial direction, respectively. 20 and 21 are the lower flat surface 19, that is, the horizontal line X-X', and the side vertical surface 12, that is, Y-
The raceway grooves for the loaded ball are formed at 45 degrees with respect to Y', and the radius of curvature of the raceway grooves 20 and 21 is preferably about 52 to 53% of the ball diameter.

Reference numeral 22 denotes a right side protrusion formed by the raceway grooves 20 and 21, and the protrusion 22 has the right side vertical surface 12 and is formed along the axial direction.

23 is a rack (referring to a linear tooth) formed over the entire length of the left vertical surface 12;
The rack 23 is formed to mesh with a pinion, which will be described later. 24, 24 are a plurality of through holes extending from the upper surface to the lower surface of the track base 10, and the through holes 24, 24
The track base 10 is attached to internal threads 28, 28, . . . formed on the lower surface 27 of a movable table 25 of a machine tool, etc., through bolts 26, 26, .

The track 10' is the same as the track 10 except that track grooves 20 and 21 are formed on one side.

Numerals 29 and 29 are protruding members for positioning and preventing slight movement of the tracks 10 and 10', and are formed on the lower surface of the movable table 25 at a required interval.

Reference numeral 30 denotes a fixed bed of a machine tool, etc. Flange portions 31 and 32 are formed upward on both sides or inside of the fixed bed 30.
Female threads 45, 45 for attaching bearing blocks 33, 34, which will be described later, are formed adjacent to the bearing blocks 1, 32 and fixed to the upper surface 35 of the bed.

The bearing blocks 33, 34 are formed by cutting a shaft formed into a desired shape by drawing a steel material, and the bearing blocks 33, 34 are formed of bearing bodies 35, 36 and mounting holes 37, 38 in the center. The bearing bodies 35 and 36 are formed with load ball raceway grooves 38 and 39 for guiding the balls 40.

The load ball raceway grooves 38, 39 are formed above and below in parallel to a position forming an angle of 45 degrees with respect to the horizontal focus X-X passing through the axis O of the bearing bodies 35, 36,
It is most preferable that the raceway grooves 38, 39 are circular arc-shaped two-point contacts, and that the radius of curvature of the raceway grooves 38, 39 is about 52 to 53% of the ball diameter.

In addition, guide holes 41 and 42 for unloaded balls, which are slightly larger than the ball diameter, are formed vertically and vertically in parallel with each other, and are arranged at an arbitrary interval and perpendicular to the horizontal line passing through the axis O of the bearing bodies 35 and 36. ing.

Reference numeral 50 denotes a retainer having a W-shaped cross section and integrally formed by punching from a steel plate.
Slits 53, 54, which are slightly smaller than the diameter of the ball 40, are formed vertically parallel to the axial direction on the inwardly inclined sides 51, 52 corresponding to the ball 40, and the balls are formed at both ends of the slits 53, 54. Tongues 55 and 56 (see FIGS. 9 and 10) for scooping up the 40 are formed.

The outer inclined sides 57 and 58 of the retainer 50 abut against the outer inclined sides 43 and 44 of the bearing main body 35 and are held by the side lids described later.

Reference numerals 60 and 61 denote side lids integrally molded from plastic or die-cast alloy, and the side lids 60 and 6
1 is a load ball raceway groove 38 shown in FIG. 7, in which a ball 40 is attached to the front and rear end surfaces of the bearing block 33 in cooperation with inner members 66, 67 shown in FIG.
39 to guide holes 41 and 42 for unloaded balls.

Two semicircular guide grooves 62 and 63 are formed on the inner surfaces of the side covers 60 and 61, and two semicircular guide grooves 64 and 65 are formed on the outer surface of the inner member 70. (See FIGS. 11 and 14) Also, a V-shaped stepped portion 6 is provided on one of the side lids 60 and 61.
8, 69 and outwardly inclined grooves 70, 71 are formed,
One end of the W-shaped retainer 50 fits into the stepped portions 68 and 69 and the grooves 70 and 71, and is held by the protruding pieces 72.

The locking pin 7 is provided on the end surface of the inner members 66 and 67.
A through hole 75 is formed in the center, and a locking hole 7 corresponding to the locking pins 73 and 74 is formed.
6, 77 are bearing blocks 33 shown in FIG.
Mounting holes 78 corresponding to the through holes 75 are formed in the front and rear end faces of the bearing block 33, and similarly, mounting holes 78 are formed in the end face of the bearing block 33. A mounting through hole 79 is formed in approximately the center of the side covers 60, 61, through which a bolt is inserted to mount the side covers and the inner member.

80 is a pinion (small gear), and the pinion 80
is formed on the protruding part of the track 10 and has a rack 23.
mesh with.

The pinion 80 is attached to a bearing box 81 which is attached to the fixed bed 30 with a bolt 84.
It is fixed with a nut to one end of a shaft 83 which is rotatably supported via a bearing 82.

A connecting member of a drive mechanism 87 is attached to the other end of the shaft 83.

In operation, the movable table 25 is moved forward or backward from the rotating pinion 80 through the rack 23 of the track base by the drive of the shaft 83 on the fixed bed 30 side.

As the movable table 25 moves forward or backward, the bearing blocks 33, 34 and the track 1
The ball 40 between 0 and 10' is connected from the raceway groove for the loaded ball to the hole 4 for the unloaded ball in the bearing block.
1, 42 or the opposite direction through the walker 50 and the side covers 60, 61.

In addition, the preload bolt 8 attached to the bed 30 side
By tightening screws 5 and 86, a preload can be applied to the balls between the bearing block and the way, thereby preventing the movable table from meandering during forward or backward movement. FIG. 16 is a cross-sectional view of another embodiment of the present invention in which the track base of the present invention is installed on the outside of the movable table.

The left and right raceways are arranged on the outside of the bearing block, and the pinion is engaged with the raceway on which the inner rack of these raceways is formed. Since the arrangement is different and the other parts are the same as those in the previous embodiment, the same symbols are used for the same items and their explanations are omitted.

[Brief explanation of drawings]

Figure 1 is a perspective view of the track base of the present invention, and Figure 2 is a perspective view of the track base of the present invention.
Figure 3 is a sectional view taken along the line A-A, Figure 3 is a plan view of an embodiment in which the track base of the present invention is applied to a machine tool, and Figure 4 is a sectional view of the
Fig. 5 is a partially sectional front view showing a combination of the track base and bearing block of the present invention, Fig. 6 is a partially sectional side view of Fig. 5, and Fig. 7 is a sectional view of the present invention. Figure 8 is a front view of the bearing block supported via balls in the raceway groove of the way base, Figure 8 is a partially sectional side view of Figure 7, Figure 9 is a side view of the retainer attached to the bearing block, Figure 10 is a side view of the retainer attached to the bearing block. C in Figure 7
-C line sectional view, Figure 11 is a front view of the side cover attached to both end faces of the bearing block, Figure 12 is the 1st
FIG. 13 is a side view of FIG. 11, FIG. 14 is a front view of the inner member, FIG. 15 is a plan view of FIG. 14, and FIG. 16 is a plan view of the track base of the present invention. FIG. 6 is a sectional view showing another embodiment of the rack and pinion. 10: Track base, 11: Upper flat surface, 12: Vertical side surface, 20, 21: Raceway groove for load ball, 2
3: Rack, a, b: recess.

Claims (1)

[Claims for Utility Model Registration] (1) In the track base in which recesses are formed on both sides of the bar, two load ball raceway grooves are formed in one protrusion formed by the recesses, A track platform characterized in that a rack is formed in the axial direction on the other protrusion. (2) The track base according to claim 1, wherein the recesses formed on both sides are symmetrical. (3) The track base according to claim 1, wherein the recesses formed on both side surfaces have irregular shapes. (4) The track base according to claim 1, wherein a driving pinion that meshes with a rack of the track base fixed to the movable table side is rotatably attached to the bed side. (5) Utility model registration claim No. 1 in which a ball is arranged between the load ball raceway groove of the way base fixed to the movable table side and the load ball raceway groove of the bearing lock fixed to the bed side. Track platform described in section.