JPS626983Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a linear motion bearing device capable of applying loads in four directions: up, down, left, and right.

In mechanical devices that perform linear motion, such as tables of machine tools, other measuring instruments, and sliding parts of press machines, bearing devices with rolling element circulation, which can have an infinite sliding stroke, are often used. .

In this bearing device, rolling elements are interposed between a raceway with a rolling surface and a sliding body attached to the device to circulate the bearing. Conventionally, balls have been used as the rolling elements. There are many types that use rollers when used under high load conditions.

By the way, when this type of bearing device is installed into a mechanical device, the bearing and track are often disassembled.
It is necessary to configure the bearing so that the rolling elements do not fall off from the bearing during disassembly. Therefore, the structure of the cage that holds the rolling elements has become complicated. In addition, this type of bearing device needs to be constructed so that it can carry loads in all four directions, up, down, left, and right. Conventionally, double-row bearings were used, resulting in a complex structure, making it difficult to manufacture tracks and sliding bodies, and making them expensive. I was getting used to it. Furthermore, it is desirable that the bearings incorporated into the device have rolling elements that roll smoothly and are also easy to process.

In view of the above-mentioned conventional problems, this idea was improved and eliminated, and a linear motion bearing that circulates rolling elements in a single row is used to apply loads in four directions between the way base and the sliding body. The structure of the bearing is simple and easy to manufacture, and at the same time, it is also easy to manufacture the way and sliding body, and the rolling elements do not fall off when disassembled. This is a device that has

The configuration of this invention will be described below with reference to embodiments shown in the drawings.

In Fig. 1, reference numeral 1 denotes a long track with a rectangular cross section, and two rows of raceway surfaces 2, 2 are formed on the upper surface 1a over the entire length in the longitudinal direction, and on both side surfaces 1b, 1c, respectively. The rolling surfaces 3, 3 are formed over the entire length in the longitudinal direction. Reference numeral 4 denotes a U-shaped sliding body that straddles the way base 1, and has bearing raceway portions 5, 6, 6 formed along the longitudinal direction on three inner surfaces facing the way base 1, and each bearing raceway. Fitting grooves 7, 7, 8, 8 are formed in the portions 5, 6, 6 over the entire length in the longitudinal direction in correspondence with the rolling surfaces 2, 2, 3, 3 of the track base 1. 9 is a fixing bolt hole formed in the track base 1, 10, 10
Reference numerals denote mounting bolt holes formed in the sliding body 4, and the mounting bolt holes 10, 10 are used to mount a mechanical device (not shown) for performing linear motion. These fixing bolt holes 9 and mounting bolt holes 10, 1
An appropriate number of 0's are formed along the longitudinal direction. Reference numeral 11 denotes a single-row recirculating linear motion bearing (hereinafter simply referred to as a bearing) installed between the way base 1 and the sliding body 4, which allows the sliding body 4 to make a slight linear motion and also allows the sliding body 4 to move in four directions. Apply a load. As shown in FIGS. 2 and 3, this bearing 11 includes a flat plate 12 that applies a load, balls 13 which are rolling elements, and a flat plate 12 that is attached to the flat plate 12.
A pair of cages 1 that hold and circulate the
It consists of 4 and 14. The flat plate 12 is made of bearing steel or the like, and the bearing raceways 5, 6 of the sliding body 4,
6, and one surface thereof has a raceway surface 15 that forms a circulation path for the balls 13 between the raceway surfaces 2 and 3 of the wayway 1 over the entire length in the longitudinal direction. It has been formed. The retainer 14 has a through hole 16 formed in the center thereof through which the flat plate 12 passes, and a rolling groove 18 for forming a circulation path 17 for the balls 13 around the through hole 16. The rolling groove 18 has a slightly larger curvature than the ball 13, and a loaded ball rolling portion 18a holds the ball 13 on the rolling surface 15 of the flat plate 12 with a part of its circumferential surface exposed. A U-shaped reversing rolling section 18b for reversing the ball 13 and a no-load ball rolling section 18c for rolling the ball 13 in a free state are continuously formed. Then, two of these retainers 14 are combined, and the rolling grooves 18, 18 are faced to each other, and the through holes 16, 16 are made to face each other.
is passed through the flat plate 12, and its rolling surface 15 is aligned with the loaded ball rolling portions 18a, 18a of the rolling grooves 18, 18. As a result, the vertical and longitudinal movements of the retainers 14, 14 are stopped by the flat plate 12, and a circulation path 17 for the balls 13 is formed around the rolling surface 15 of the flat plate 12, thereby forming the bearing 11.

Note that this bearing 11 has a rolling surface 1 in a row on a flat plate 12.
5 is the basic structure, but there is also a 4th structure.
As shown in the figure, two rows of rolling surfaces 15 are arranged on the flat plate 12'.
15 may be formed. However, each rolling surface 15,
It is assumed that the retainers 14, 14 are attached to the holder 15.
Further, the balls 13 are inserted into the rolling grooves 18, 18 when the retainers 14, 14 are assembled.

The bearings 11 configured as described above are mounted on the bearing raceways 5, 6, 6 of the sliding body 4, respectively. That is, two rows of raceway surfaces 15, 15 are formed on the bearing raceway 5 at the center of the inner surface of the sliding body 4, and the bearings 11 each having a retainer 14, 14 assembled thereon are combined. A part of the flat plate 1 is fitted into the fitting grooves 7, 7.
2' into the bearing raceway 5 and screwed.
Similarly, a bearing 11 having a row of raceway surfaces 15 is combined with the bearing raceways 6, 6 on both sides of the sliding body 4, and the retainers 14, 14 are fitted into the fitting grooves 8, 8, and the flat plate 12 is fitted. Installed within the bearing raceways 6, 6,
Fasten with screws. Then, the bearing 11 is mounted on each bearing raceway surface 5, 6, 6 of the sliding body 4. The retainers 14, 14 of the bearing 11 are fixed by the flat plates 12, 12' and the fitting grooves 7, 8 of the sliding body 4, and the balls 13, 13, . exposed to the front. And exposed balls 13, 13...
The sliding body 4 is made to straddle the way base 1 so that it contacts the rolling surfaces 2, 2, 3, and 3 of the way base 1.

In the above configuration, when the sliding body 4 on the track 1 is moved by an appropriate means, the balls 1 of the bearing 11
3, 13... are guided by the rolling surfaces 2, 2, 3, 3 of the track 1 and the rolling surfaces 15 of the flat plates 12, 12', and roll in the circulation path 17 in the cages 14, 14. The slider 4 circulates and smoothly moves linearly along the track 1. During this operation, vertical and horizontal loads act on the sliding body 4, but these loads are
The load is applied by bearings 11, 11, . . . arranged vertically and horizontally between the track 1 and the sliding body 4,
The sliding body 4 is guided and moved accurately without wobbling.

In the bearing device having the above structure, the circulation path 17 formed by the retainer 14 is seamless, the balls 13 roll smoothly, and the sliding body 4 moves smoothly.
Further, the cage 14 can be easily manufactured by forming it from synthetic resin. Furthermore, the flat plates 12 and 12' of the bearing 11 are machined in a continuous plane and can be easily machined with high precision.Similarly, the bearing raceways 5, 6, and 6 of the sliding body 4 are also machined in a plane, and the balls 13 are directly machined. Since no load is applied, no heat treatment is required, no distortion occurs, and it can be easily formed with high precision. Further, since the track 1 has a rectangular cross section as a whole, each raceway surface 2, 2, 3, 3 is machined with high precision. Therefore, the entire device can be manufactured easily and with high precision, and its operation after assembly is stable.

FIG. 5 is a drawing showing another embodiment, in which the floating load capacity of the bearings 11 arranged on the left and right sides of the track 1 is increased to prevent the sliding body 4 from floating. . That is, the upper part of the track 1 is formed wide in the width direction to form tapered rolling surfaces 19, 19 that are inclined on both sides, and the lower part of the inner surface of the sliding body 4 is formed to be approximately perpendicular to the tapered rolling surfaces 19, 19. Tapered bearing raceway part 2 that is inclined in the direction of
0, 20, and attach the flat plate 12 of the bearing 11 and one cage side surface to the bearing raceways 20, 20, respectively, attach the retaining plates 21, 21 from the outside, and then attach the flat plate 11 and the retaining plate 21 together. Screws are fixed to the sliding body 4, and the balls 13 are attached to the tapered raceway surface 1 of the way base 1.
9,19. Note that the same reference numerals as in FIG. 1 indicate the same components.

The action in this case is similar to that of the previous embodiment, in which the sliding body 4 is made to make a slight linear movement along the track 1,
Further, the left and right bearings 11, 11 prevent the sliding body 4 from floating up and guide it accurately.

FIG. 6 is a drawing showing still another embodiment, in which the rolling elements of the bearing that apply the load in the vertical direction are constituted by rollers 22 having high load capacity and high rigidity. That is, two rows of roller rolling surfaces 2 are provided on the flat plate 23.
4, 24, and these roller rolling surfaces 24, 24
A circulation groove 2 with a rectangular cross section in which a roller 22 can circulate in a pair of cages 25, 25 that are mounted so as to surround the holder 25.
6, 26, and one end face is opened over the entire length in the longitudinal direction, is mounted on the bearing raceway 5 at the center of the sliding body 4, and the bearing 27 is mounted on the upper surface of the other wayway 1. Rolling surfaces 28, 28 that enter the cages 25, 25 and come into contact with the rollers 22 are integrally formed to protrude over the entire length, and the rollers 22 are made to roll on these rolling surfaces 28, 28. It is something. Note that the same reference numerals as in FIG. 5 indicate the same configuration contents.

The operation in this case is the same as in the previous embodiment, and the sliding body 4 is guided in the vertical direction by a bearing 27 having a roller 22, and in the left and right direction by a bearing 11 having a ball 13.
The robot moves lightly on the orbital platform 1 while being guided by the robot. The roller 22 used in this embodiment has a diameter to length ratio of about 1:2 to 3.
It is designed to be guided by the end face of the roller. This suppresses skewing of the bearing 27, allows the sliding body 4 to be guided accurately, and at the same time allows use under higher load conditions.

As explained above, according to this invention, a flat plate having a rolling surface, a pair of cages forming a circulation path,
A single-row circulating linear motion bearing consisting of a large number of rolling elements and a large number of rolling elements is interposed between the way and the sliding body to apply loads in four directions, so the sliding body can be guided accurately even with a simple configuration. In addition, the circulation path of the cage is formed continuously, the rolling elements roll smoothly, and can be operated with small power, making it widely applicable to various mechanical devices that require linear motion. I can do it.

Furthermore, since the track base, sliding body, and bearing are formed by continuous plane machining, each part can be easily machined with high precision, and a high-precision bearing device can be provided at low cost.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a circulating linear motion bearing device according to the present invention, FIG. 2 is a sectional view of a bearing incorporated in the device, and FIG. 3 is a sectional view showing the relationship between the bearing retainer and the flat plate. FIG. 4 is a sectional view showing another embodiment of the bearing, and FIGS. 5 and 6 are sectional views showing other embodiments of the circulating linear motion bearing device. DESCRIPTION OF SYMBOLS 1... Way base, 2, 3... Rolling surface, 4... Sliding body, 5, 6... Bearing raceway part, 7, 8... Fitting groove,
11... Single row linear motion bearing, 12... Flat plate, 14
... Cage, 15 ... Raceway surface, 16 ... Through hole,
17...Circulation path, 18...Circulation groove.

Claims (1)

[Scope of utility model registration request] It consists of a large number of rolling elements, a long flat plate with a rolling element rolling surface on the surface side, and a two-piece cage that has a through hole that fits into the flat plate. In a plane perpendicular to the flat plate, there is a rolling groove continuous in the rolling direction of the rolling element constituting a circulation path for the rolling element that extends surrounding the front side and the back side of the flat plate, and the circulation path is The front side of the plate is partially opened to the extent that the rolling elements do not fall off, exposing the rolling elements so that they can come into contact with the rolling element rolling surface of the flat plate and the external track, and the rolling elements are not covered on the back side of the flat plate. Rolls under load, and maintains integrity by fitting the retainer part on the back side of the flat plate into the fitting groove provided on the sliding body. A circulating linear motion bearing device characterized in that a circulating linear motion bearing device is interposed in combination so as to apply a load in the vertical and horizontal directions.