JPS5881215A - Endless sliding bearing unit - Google Patents

Abstract

PURPOSE:To reduce the height over all a bearing unit in such a way that endless circulating ball trains are arranged in four trains so as to be able to bear each load from upward and downward, from the left and the right, and by torsion, and any of return holes is formed above the tracks in the loaded zone. CONSTITUTION:A rail 1 is formed in such a way that its tracks 3-6 are arranged respectively on two areas of the upper side and both left and right sides along the longitudinal directions. Besides, an upper plate groove 8 inside the gantry of the main body 14, and side plate grooves 9, 10 on both left and right sides are respectively formed in a slide casing 2 which bestrides the rail 1, and bearing plates 11-13 are respectively attached to and tightly fixed in each groove. Then, tracks 18-21 are respectively formed at the parts corresponding to said tracks, 3-6 on each plate 11-13, and each of ball trains 22, 23, 26, 27 is inserted between a pair of parts of each track. In addition, four return holes 24, 25, 28, 29 are formed in the casing 2, so that each ball train 22, 23, 26, 27 can be circulated through shifting paths 33 on the both ends.

Description

Detailed Description of the Invention The present invention relates to a bearing unit for infinite sliding, and provides a bearing unit for infinite sliding that has high precision, low noise during sliding, low friction, and a low bearing height. The purpose is to

In the conventional endless sliding bearing unit, for example, as shown in FIG.
．． 43, side raceway surfaces 44.45 are provided on both left and right sides, and on the straddling inner surface 46 of the slide casing 41, raceway surfaces 42, 43, 44.4 of each of the rails 40 are provided.
The slide casing 41 is provided with raceway surfaces 47, 48, 49.degree. is capable of linear movement in the longitudinal direction of the rail 40, the ball rows 51 and 53 are mounted on a cage 55 made of a thin plate, and the ball rows 52 and 54 are mounted on a cage 56.
The ball rows 51, 52, 53, 54 are held so as not to separate from the slide casing 41, respectively.
The positions of the return holes 57.5B and 59.60 are in the same direction as the load direction of each load range, so the return holes 57.58 are drilled upward, and the return holes 59.60 are drilled diagonally outward and downward. It had been.

In the conventional example, it is difficult to precisely grind all of the raceway surfaces 47°, 48, 49, 50 formed on the straddling inner surface 46 of the slide casing 41, and the machining accuracy in the load range does not improve. Therefore, the sliding accuracy as a sliding bearing is poor, and the cages 55 and 56 are molded thin plates and have a complicated shape, and due to the plate thickness and fixing method, they come into contact with the balls in the ball row during sliding. The vibration during sliding caused a lot of noise, and the sliding resistance was large.

In addition, since the return holes 59, 6 and 0, which are the no-load areas of the side ball rows 53 and 54, are located below the load area, the slide casing 41 becomes taller, increasing the height of the bearing unit as a whole. As a result, the machine in which the bearing unit was installed was unnecessarily enlarged by the installation of the bearing unit. Furthermore, the rail 40 and the slide casing 41
and each raceway surface 42, 47.43, 48.44 and 49.4
Since the relative position of 5 and 50 is fixed, if it is necessary to apply a pre-pressure between each raceway surface and the respective ball row 51, 52, 53, 54, to change this pre-pressure, This is done by changing the dimensions of the balls to be inserted.For example, to increase the preload, it is necessary to insert a ball with a large diameter.When used as a bearing unit, even slight wear of the balls or raceway surface can cause the preload to decrease. If the preload is reduced or the preload is completely loosened, the machine to which the bearing unit is installed may vibrate during sliding, make abnormal noises, or reduce the sliding accuracy of the machine. However, the disadvantage was that it was not possible to change the preload conditions at all.

The present invention provides an endless sliding bearing unit that can overcome the various drawbacks mentioned above, and its configuration will be explained below with reference to the drawings.

As shown in FIGS. 1 to 3, a slide casing 2 is straddled over a rail 1, and in the longitudinal direction of the rail 1,
Upper raceway surfaces 3° 4 are provided at two locations on the upper surface, and side raceway surfaces 5° 6 are provided on both left and right sides, respectively, and an upper plate groove 8 is provided on the upper surface of the straddling inner surface 1 of the main body 14 of the slide casing 2. , side plate grooves 9° and 10 on both left and right sides, respectively.
is machined, a rod-shaped upper bearing plate 11 is installed in the upper plate groove 8, a rod-shaped side bearing plate 12 is installed in the side plate groove 9, and similarly a side bearing plate 13 is installed in the side plate groove 10. each pol) 15
．． It is screwed onto the main body 14 at 16°17.

The upper bearing plate 11 has upper raceway surfaces 18 and 19 formed at positions facing the earth raceway surfaces 3 and 4 when mounted on the main body 14 and loaded on the rail 1, and similarly upper raceway surfaces 18 and 19 are formed on the side bearing plate 12. has a side raceway surface 20 at a position facing the side raceway surface 5 , and a side raceway surface 21 at a position facing the side raceway surface 6 at the side bearing boot plate 13 .
each formed.

In the illustrated example, the upper bearing plate 11 is shown as one piece, but it may be made into two symmetrical members.

The area between the upper raceway surfaces 3 and 18 is a load area, and the ball row 22
is interposed therebetween, and the ball row 22 is capable of endless circulation as shown in FIG. 3, with the return hole 24, which is bored parallel to and substantially perpendicularly above the upper raceway surface 18, serving as a no-load area. Similarly, a ball row 23 is interposed between the upper raceway surfaces 4 and 19, and as shown in FIGS. has been done.

As shown in FIG. 5, the load direction between the upper raceway surfaces 3, 18 and the ball row 22 forms an angle α with respect to the horizontal ■-H direction, and is generally approximately perpendicular with α'=-90°. It is the direction.

Similarly, the load direction between the upper raceway surfaces 4, 19 and the ball row 23 is also approximately vertical.

Next, the space between the side raceway surfaces 5 and 20 is also set as a load area, and a ball row 26 is interposed therebetween, and as shown in FIGS. 2 and 3, an infinite It is considered recyclable. Similarly, the space between the side raceway surfaces 6 and 210 is also a load area, and a ball row 27 is interposed therebetween, allowing endless circulation through a return hole 29 bored diagonally upward.

The load direction between the side raceway surfaces 5, 20 and the ball row 26 forms an angle β with respect to the horizontal H-H direction, as shown in FIG. 600.Similarly, the side raceway surface 6,
The load direction between the ball row 21 and the ball row 21 is also a direction that is inclined outwardly and downwardly at an angle β with respect to the horizontal direction that is symmetrical to the load direction of the ball row 26.

As shown in FIGS. 1, 3, and 4, side plates 30.3 are provided at the front and rear ends of the main body 14 of the slide casing 2 in the direction of movement.
0 is fixed to the side plate 30 via a mounting port 31, as shown in FIG.

As shown in Fig. 4, each ball row 22, 23°26.2
The return holes 24 and 2 are the rolling load area and no-load area of 7.
5.28.29 are connected respectively, and each pole row changes direction smoothly.
, 35 are provided.

As shown in FIGS. 3 and 4, the diversion path 33 connects the upper raceway surface 19 and the return hole 25 in a substantially semicircular arc shape in a substantially vertical plane. As shown in FIGS. 3 and 9, a guide plate 3T is embedded in the switching path 33 at the position where the ball rows 23 come into contact and roll, as shown in FIGS. 3 and 9, in order to prevent wear and tear.

Similarly, the switching path 32 connects the upper raceway surface 18 and the return hole 24 in a substantially semicircular arc shape, and the ball row 2 of the turn path 32 allows the ball row 22 to change direction smoothly.
A guide plate 36 is embedded in the position where the two abut and roll.

In addition, the switching path 34 is connected to the side track surface 20 as shown in FIG.
and the return hole 28, and its bent shape is such that the projected view of the plane perpendicular to the direction of movement of the bearing unit is inclined at the position where it connects with the side raceway surface 20, as shown in FIGS. 3 and 5. The projection view on a plane including the respective axes of the side raceway surface 20 and the return hole 28 which are parallel to each other and which form a downward angle of β and are connected to the return hole 2B in a substantially arc shape is approximately It has a bent semicircular arc shape, and as described above, the ball row 26 of the switching path 34 comes into contact with and rolls in the position shown in FIG.

As shown in FIG. 10, the guide plate 38 having the above-mentioned curved surface is embedded.

Similarly, the diversion path 35 connecting the side raceway surface 21 and the return hole 29 has a symmetrical shape with the diversion path 34, and as described above, a guide plate 38 and a symmetrical guide plate 39 are buried in the diversion path 35. ing.

In addition, as shown in FIGS. 5 to 7, the bearing plate 11 includes a ball row 2 that contacts and rolls on the upper raceway surface 18.
In order to prevent the ball row 22 from slipping off, slightly protruding tongues 61, 61 are provided adjacent to the pole row 22 to hold the ball row 22 from both sides.

Similarly, the ball row 23 is held by the tongues 62, 62, the ball row 26 is held by the tongues 63, 63, and the ball row 2γ is held by the tongues 64', 64.

Further, as shown in FIGS. 1, 2, and 3, at least one of the side bearing plates 12, 13 (in the illustrated example, the side bearing plate 13) is provided with a horizontally inwardly pressed side bearing plate; A preload device 65 is provided to ensure proper preload between each raceway surface and the ball row.

The illustrated preload device 65 includes a preload bolt 66 and a fixing nut 61 screwed into the side surface of the main body 14 so as to reach the outer surface of the side bearing plate 13.

To adjust the preload, loosen the port 1γ to allow the side bearing plate 13 to move on the side plate groove 9, then loosen the fixing nut 67 and rotate the preload bolt 66 to move it forward and backward in the horizontal direction.

For example, due to long-term use, the poles and raceway surfaces of each ball row may become slightly worn, causing the slide casing 2 that slides on the rail 1 to vibrate, or when a larger preload is required. etc., screw in the preload bolt 66 and push the side bearing plate 13 slightly inward.

By this pushing, the ball row 2T and the side raceway surface 6.21
At the same time, the preload between the ball row 26 and the side raceway surfaces 5, 26 increases, and as described above,
Since the load direction in the load range of the ball row rows 2T and the ball row rows 26 is directed upwards when viewed from the side bearing plate 13.12 side, the ball row rows 22 and the upper raceway surface 3.1
The preload between the ball row 23 and the upper raceway surfaces 4, 19
The preload between the two also increases.

At the position where the required preload is reached, tighten the fixing nut 6γ and bolt 1.
7 to fix the side bearing plate 13 under a predetermined preload.

Further, as described above, since the upper bearing plate 11 is attached to the main body 14 in the upper plate groove 8 and the side bearing plates 12 and 13 are attached to the main body 14 in the side plate grooves 9 and 10, respectively, as shown in FIG. Groove 8
The upper bearing plate 11 and the side bearing plate (12.
Since the surface 13 is also precisely ground, it has become possible to significantly improve the bearing precision of the slide casing 2 as a whole.

The present invention has the structure described in the claims, and has four endless circulation pole rows, which can reliably support upward, downward, leftward, rightward, and torsional loads. With,
Since each return hole is formed above the raceway surface in the load area, it is possible to reduce the height of the entire bearing unit, making it possible to downsize the machine to which the bearing unit is installed, and the main body. Since the bearing plate and the slide casing are separated, it is easier to work on the slide casing as a whole, and the machining accuracy is improved, making it possible to improve bearing sliding accuracy.Moreover, the structure is suitable for mass production, and the ball row Since the load direction between the upper raceway surface and the upper raceway surface is approximately perpendicular, and the load direction between the side raceway surface is an inclined direction, a single preload device improves the upward load as a bearing unit, and the side bearing plate By moving the ball horizontally, it becomes possible to apply a substantially uniform preload to all ball rows.
This preload condition can be changed even during use.
In addition, each ball row can be carried by a tongue formed on the bearing plate, and there is no separate cage force, which reduces the sources of vibration, and the bearing unit as a whole produces less noise and less wear during use. , it was possible to obtain bearing units with high precision at all times, and furthermore, because it was suitable for mass production, production costs were reduced.

[Brief explanation of the drawing]

Figure 1 is a side view of the embodiment, Figure 2 is nm in Figure 1.
@ sectional view, Fig. 3 is a sliding direction elevational view including the sectional view taken along line 1-1 in Fig. 1 in the left half of the same as above, Fig. 4 is a central vertical sectional view of the slide casing, and Fig. 5 is Fig. 2. FIG. 6 is an enlarged partial sectional view of the upper bearing plate showing the relationship between the middle raceway and the ball, FIG. 7 is an enlarged partial bottom view of the upper bearing plate, and FIG. 8 is an enlarged partial bottom view of the upper bearing plate. 9 is a perspective view of the side bearing plate, FIG. 9 is a perspective view of the upper guide plate showing the state of ball guidance, FIG. 10 is a perspective view of the upper guide plate, and FIG. 11 is a sectional view of a conventional example. 1: Rail, 2 Ni-ride casing, 3° 4: Upper raceway surface, 5, 6: Side raceway surface, 1: Straddle inner surface, 11: Upper bearing plate, 12.13: Side bearing plate, 1
4: Main body, 18° 19: Upper raceway surface, 20.21: Side raceway surface, 22° 23.26, 27: Ball row, 24, 25
゜28.297 Return hole, 61, 62, 63゜64
: Tongue, 65: Preload device, 66 Two preload ports. Patent applicant Nippon Thomson Co., Ltd. Agent Osamu Kawa Yoshito Tatsuya Fuji Figure 6 Figure 8

Claims (1)

[Claims] A slide casing is straddled over a rail having raceway surfaces provided in the longitudinal direction on the top surface and both sides, and a raceway surface facing each of the raceway surfaces of the rails is provided on the straddling inner surface of the slide casing. , for infinite sliding, in which the slide casing is capable of linear movement in the longitudinal direction of the rail through an infinitely circulating ball row interposed in a load area between the track surface and the rail track surface; In the bearing unit, the infinite circulation pole rows are arranged in two rows on the top and one row on each side on the left and right sides, and the return holes, which are the no-load areas of each endless circulation path, are on the raceway surface. The upper raceway surface and the side raceway surface of the slide casing are respectively formed at four positions facing each raceway surface of the rail on the inner surface of the main body of the slide casing. It is formed on a rod-shaped bearing plate that is mounted separately, and the pole AM in the load area on each raceway is held on the bearing plate by a slight protrusion on the bearing plate near the ball row toward the rail side. The load direction on the upper raceway surface and the ball row in the load area is approximately vertical, and the load direction on the side raceway surface and the ball row is a direction inclined outward and downward from the horizontal direction. The endless sliding bearing unit is characterized in that at least one of the side bearing plates is capable of adjusting the preload in the horizontal direction by a preload device consisting of a preload bolt screwed onto the side surface of the casing body. .