JPS58142017A - Four-way loaded linear bearing - Google Patents

Abstract

PURPOSE:To improve easiness and accuracy of machining a bearing and obtain its cost down and smooth circulative alignment of balls, by forming both holders and side caps to a divided type consisting of two segments. CONSTITUTION:Ball rolling surfaces 7-10 are provided to the internal periphery of skirt parts 3, 4 while escape ball holes 11-14 are penetratively provided to skirt inner solid parts in a bearing main unit 1. While ball direction changing U- shaped grooves 20a', 20a'', 20b', 20b'' communicating the surfaces 7-10 to the holes 11-14 and almost W-shaped stoppers grooves 21a, 21b crossing a start end of these grooves 20a'-20b'' are provided to internal faces of two divided side caps 15, 16 secured to front and rear end sides of the unit 1. Further in a pair of holders 23, 24, a slit corresponding to the surfaces 7-10 is provided while its both end parts are engaged to the grooves 21a, 21b. Further ball rolling surfaces 32-35 corresponding to the surfaces 7-10 are provided to a track bed 29 while balls B1 are interposed between the unit 1 and ball rolling surfaces of the bed 29, further seal plates 27, 28 are tightly attached to an opening part of the unit 1.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a four-sided, uniformly charged linear bearing used for sliding surfaces of machine tools such as tails and machining centers, or sliding CWJ of conveying devices that reciprocate while supporting heavy objects. .

Regarding a four-way uniform load type linear bearing that can support loads in four directions, including a duty load (lower load), a lateral load, and a floating load 11 (upward load), the present applicant has proposed The technical details thereof were disclosed in Patent Publication No. 55-72912.

However, in this prior art, both the side cover attached to the opening of the bearing body and the retainer 4 which is interposed between the scissor bearing body and the track base and which rolls are formed as one piece. , my friend is having the following problem. In other words, the side lid is integrally molded from mari cedar, and its inner periphery is made to match the shape of the central recess in the main shaft of the bearing. Because it is equipped with a hollowed-out recess, the shape is not only complicated, but also the thickness is uneven.In particular, the heating and pressurizing conditions associated with flow and hardening are inadequate, and the structure is adapted to the shape and capacity of the molded product. Because it is difficult to manufacture the metal part of the mail, it is difficult to produce the dimensions due to distortion, which has the disadvantage that smooth direction change of the mail is hindered.

In addition, processing time is required, which is one of the factors contributing to high costs.

In addition, the cross-sectional shape of the integrated G-shaped cage is made to match the shape of the central recess in the bearing body, resulting in a complex approximately horseshoe shape. It was difficult to position the holes during forming, and it was also difficult to press out the slits drilled in the lower left and right inclined surfaces, resulting in a gap which was one of the factors contributing to the high cost.

Furthermore, it is difficult to form the cage into a seam shape using a press, resulting in poor processing accuracy, which makes it impossible to maintain the rigidity of the cage at an appropriate value due to dimensional luck, scattering, etc. This makes it impossible to manufacture long bearings in the axial direction, and prevents the occurrence of deflection when a load is applied to the armpit holding mackerel. There was a problem that prevented movement.

Therefore, the present invention has been made to solve the problems of the prior art, and its purpose is to make both the retainer and the side cover into two segment type, and to process them. The aim is to achieve the same ease of processing and processing accuracy, thereby reducing costs and ensuring smooth alignment and circulation. Another purpose is to make the cross-sectional shape of the cage approximately W-shaped and increase the rigidity of the inside of the cage, thereby making it possible to manufacture bearings that are long in the axial direction. The purpose of the present invention is to enable the retainer to be fixed by a simple method of engaging both ends of the retainer with the locking grooves of the side cover, thereby improving ease of assembly.

The gist of the present invention having the above-mentioned object is to provide a block body having a U-shaped cross section in which skirt portions are provided on the left and right sides sandwiching a central recess in the lower center, and the inner circumferential side of the skirt portion is provided with a mail diameter. When an arbitrary number of mail rolling surfaces having approximately the same radius of curvature and extending in the axial direction are provided, a trap is provided at the center of the skirt located outward from the mail rolling surfaces, parallel to the mail rolling surfaces. and the same number of reliefs extending in the axial direction? - a main bearing hole provided with a through-hole for the bearing hole; and a pair of front and rear lids fixed to the front and rear end surfaces of the main bearing hole and having an inner circumferential shape similar to the inner circumferential shape of the main bearing hole; A U-shaped groove for changing the mail direction that communicates with the mail rolling surface and the escape mail hole in a corresponding relationship, and a substantially W-shaped locking groove that crosses the starting end of the U-shaped groove for changing the mail direction, respectively. A side cover is provided on the inner surface of the cover body and is divided into two in the width direction, and the inner inclined surface is provided with a slit corresponding to the mail rolling surface of the bearing body, and both ends thereof are engaged with the locking grooves of the side cover. A pair of cages having a substantially W-shaped cross section, and a mail rolling surface having a radius of curvature that corresponds to the mail rolling surface of the main shaft of the bearing and having a radius of curvature that is approximately the same as the mail diameter are formed above and below the left and right protrusions. The track is interposed between the bearing body and the goal rolling surface of the track and moves in a circular manner? - a four-sided, same-load type linear pair 1-long, characterized in that it consists of a ring and a seal plate that is brought into close contact with the opening of the main shaft of the bearing.

The present invention will be described below based on the illustrated embodiments.
″
indicates the metal rod of the bearing body, and this bearing book #-1 has a cross section of 1 block of Japanese cedar], and is equipped with an approximately rectangular hollow recess 2 at the bottom center. Hollow recess 2t-
It has skirt portions 3.4 on the left and right sides thereof.

5.6 is a concave groove with a substantially trapezoidal round cross section that is symmetrically provided on the inner circumferential side of each scar (s3.4), and the corners 16 on both sides of the concave grooves 5 and 6 have grooves that are approximately the same as the goal diameter. l with radius of curvature
- Rolling wheels 1ili7 to 10 are provided in the axial direction over the entire length of the bearing body 1.

Therefore, this ♂-le raceway surface 7 to lO is the inner circumference ILL.
5 and 6 and are vertically symmetrical with respect to the horizontal 4IX passing through the center 0 of the bearing body 1, and each l - The center of the circle that forms the rolling surface is set.

Since the center of the circle forming the mail rolling surfaces 7 to 10 is set on the above-mentioned intersection MY, the contact angle β between the load mail B+ transferred to the mail rolling surface and the #1 rolling surface can be calculated as follows: It can be set at 45 degrees, and if the load breaks, the load will be the same as the surface of B3? - Since the contact area due to elastic deformation occurring between the groove surfaces of the roller rolling surfaces 7 to 10 increases, the load carried by each part on the brush contact surface is reduced, and the load capacity increases.

Reference numerals 11 to 14 indicate relief holes extending in the axial direction through each skirt portion 3.4 of 1 in the bearing body, parallel to the ball rolling surface, and parallel to the center line of the circumferential recess #$5°6. The bearings are arranged vertically symmetrically based on the horizontal twtx passing through the center 0 of the bearing base 1, and the intersection MY makes an angle [45 degrees with the horizontal l11x]. XIIIK is forced to be close to the wealthy. Hole 11-14 for escape goal like this
By approaching the above-mentioned horizontal IIX, the thickness between the upper and lower sides of the bearing main body 5 can be reduced, and as a result, the load application point of the bearing body is lowered, so it is more effective against lateral, vertical, and other loads. can also exhibit stability. No load? - The escape goal hole 11-14, which serves as an equal passageway for the ball Bm, is formed somewhat larger than the goal diameter so that the goal can be easily transferred.

Furthermore, in the present invention, holes 11 to 1 for # escape mail
4, approach the front horizontal line X and move the goal rolling surface 7 to 1
Since the skirt portion 3.4 is disposed outward from the point o, the skirt portion 3.4 is formed to be thick in the width direction. And Scar)! ! If 3.4 is made very thick, the rigidity of the bearing body will increase, so the skirt part will not expand outward inadvertently even when a load is applied.

J5, 16 is a split type side cover that is attached to the main bearing l in the front and back direction by fixing means such as melt,
It is performed by injection molding or die casting using synthetic lIt resin materials or die casting alloys. Therefore, the configuration of i11[15, 16 above is changed to one 111115
To explain, there are two segments 15m having an abbreviated cross section.

11IH5#'i formed by combining 15b in a substantially U-shape, with a substantially rectangular hollow recess 17 at the lower center 11,
In addition, there are skirts on the left and right sides of the hollow recess 17.
At the same time as providing l Is a r t B b, a symmetrical recess # 19a is provided on the inner circumferential edge of each skirt portion.
.

By forming the bearing body 19b, the bearing body l
It has a shape similar to the inner circumferential shape of.

Further, the side lid 15 includes the above-mentioned dragons) 15m and 15b.
U-shape 20 a' + 20 m' and 2 [b'
, 2Llb".Each l-le direction change U
Length: 20m.

20a', 20b', and 20b', the U-shape #I for changing the direction of each mail is aligned with the center line of the inner grooves 5 and 6 of the bearing. The inner circumference f on the side lid side coincides with the horizontal 1ilx passing through the center 0 of the real salary l! 42 #l 19 a t l
9 b) Center! i t A nine-crossing line Y' that is vertically symmetrically arranged with respect to a horizontal line X' that passes through the center 0' of the pear-side lid, and that intersects at an angle α' of 45 fK with respect to the horizontal line.
Its starting point is set above. Next, the U-shaped groove for changing the direction of the bearing gradually bends away from the intersection, sy/, and approaches the horizontal line X', and eventually the bearing main tIl
The end point is the point corresponding to the hole 11-14 for escape & -1 in -1.

In short, each I-ru direction change U-shaped groove 20m', 2
0m', 20b', and 20b' have their starting ends communicated with the mail rolling surfaces 7 to 10, and at the same time, their terminal ends are connected to the escapement surfaces 7 to 10. - communicate with the holes 11-14 for holes 11-14. Therefore, the side covers 15 and 16 equipped with the U-shaped ends for changing the direction of the barrel communicate the mail rolling surfaces 7 to 10 and the front provision of the relief mail holes 11 to 14, which are in a mutually corresponding relationship. . One side is connected to the turn surface 7 to lO, and the other side of the hole 11 to the opening is connected to the lid 15 of the above-mentioned one.
and another side lid 16 having the same osg, for example l? A circular movement path for the ball is formed by the ball rolling ff17 and the escape ball hole 11 of 1.

21a and 21b have a predetermined depth D on the circular surface of one side cover 15.
This locking groove 2 is approximately 2-shaped locking groove provided with
1a and 21b have the above-mentioned ? - U-shaped grooves 20a', 20m' and 20b' for changing the direction of the wheel.

It is formed to cross the starting end of 20b#. It is assumed that a substantially double-shaped retaining groove (not shown) having the same configuration is also provided on the inner surface of the other side cover 16. Note 22
What about a and 22b? - This is an oil groove for supplying oil to the U-shaped groove for changing direction.

23 and 24 are a pair of cages for guiding the transfer of the load balls B3, which are made by bending a band-shaped steel plate into a substantially double-shaped cross section;
There is enough sulin on the slope to prevent the ball from falling off) 2
At the same time that the slits 3a and 24a are formed, tongue pieces 23b and 24b are formed at both ends of these slits.

What are these tongue pieces 23b and 24b? - Rolling surface f~l
After quickly picking up the mail that has been transferred by rolling O, use this as U' to change the direction of the mail! ＃婢2(1m', 20m'
and 20b', 20b', -... act to reduce the feed inward, and from the linear direction to the rotational direction? - This allows the vehicle to change direction smoothly. Therefore, this pair of retainers 2
3.24 locks both ends of said side 15°16 with #12
1a, 2ib, . . .

This fixes it to the side covers 15 and 16. As mentioned above, these tongue pieces 23b, 24b serve to guide the Fis-Line from the linear direction to the rotational direction, so the strength of
The rigidity of the retainers 23 and 2 is very high.
It is desirable to impart rigidity to '4 by subjecting it to a heat treatment such as tuftslide P treatment.

7, insert the retainers 23 and 24 into the bearing base 1, and fix both ends with [1i15, 16]
It is assumed that the central axes of the slits 23a and 24a and the central axes of the mail rolling surfaces 7 to 10 are on the same straight line.

25.26 is a rhinoceros seal plate, which is made of steel @25m and has approximately the same shape as the # surface shape of Confucian [15 and 16].

Rubber seals 25b and 26b are baked and fixed on the inner circumferential end of 26a, and are installed in hole 25C1 with gel etc.
26c to the outer surfaces of the II lids 15 and 16, it is possible to prevent foreign matter from entering through the opening force λ of the bearing body l.

27.28 is an axial seal plate, a long steel plate 27, 2
Mounting holes 27b and 28b are formed in 81L, and seals 27c and 2.8c with an L-shaped cross section of 1fi are formed on the outer circular surface.
Power five burning is fixed. Cough axis same seal @27.2
8 is attached to the downward sloping surface of the skirt portion of the bearing body I, the pair IJ ring body I is attached from below.
I? Preventing foreign matter from entering 3-b; Possible.

29 are the hollow recess 2 of the bearing main shaft and the hollow recess t? of the side cover. , . . . It is a track that is inserted into the inside, and is attached to a movable part or a fixed S of a machine tool, etc. using an O-mounting means such as a bolt. This track base has protrusions 3Q and 31 on the upper left and right sides in the axial direction, and bearings 1) are provided on both sides of these protrusions 30+31. - Le rolling surface 7
Ball rolling surfaces 32 to 35 are formed having a radius of curvature that is approximately the same as the mail diameter corresponding to ~lO. Therefore, the mail rolling surfaces 32 to 35 of the track base 29 are also the same as those of the bearing main body 1? -L rolling WJ7~1・Load & -L B
The contact angle β between l and the armpit ball rolling surfaces 32 to 35! 45
[K is added, which increases the load capacity. The round mounting hole for fixing the 36Fi track base 29 to the fixed ped IIIK is a hole.

B is a mail that is interposed between the bearing main camp 1 and the track base 29 and moves in circulation, and is transferred between the main ring base and the I-ru rolling surfaces 7 to JO and 32 to 35 of the track base to carry the load. The load applied is one B1. #Ki bearing body 1 escape? - No load rolling through hole 11 to 14 for rail? -Le B2
Contains. What about the load? - Le B1 and no load Bt
The difference is whether the same mail is transferring load areas,
It simply shows the difference between whether the employee is transferred to a no-load area or not.

By the way, is 37 in the drawing a bearin? The mounting holes drilled in the left and right 7 run sections of Honsho 1 are holes, and this mounting is through hole 37? A movable member such as a movable cheagle is fixed to the bearing main body by a bolt. A grease tank 38 is provided on one side cover 15 and supplies lubricant to one circle of the bearing body through the oil grooves 22m and 22b of the side cover. 39 is @@
The mounting provided in 15.16 is a hole, and this mounting is to fix each side cover to the bearing book-1 through the hole 39.

To explain the operation of the present invention having the above configuration,
For example, the near bearing unit of the present invention, which has the same load on all four sides, is installed in the track base 26 of a machining center (not shown), and after setting the necessary mechanical equipment on the bearing body 1, the bearing unit is moved forward and backward. And bearings! The raceway surface 7~lΦ and 3
A load in good condition that is clamped by 2 to 35 is B1.
travels in one direction while being guided by the holder 5423.24. Eventually, the load B1 is lifted up from one of the tongues 23b and 24b K of the retainer 23.24, and then
The side cover 15 has a U-shaped groove zoa' for changing the direction of the wheel.

2011, 20b', and 20bl' change the direction from the rotational direction to the rotational direction, and feed it into the relief holes 11 to 14 of the bearing main body l, forming the no-load ball Bm. After that, the unloaded ball running through the escape mail holes 11 to 14F3 is changed direction from the linear direction to the rotational direction by the U-shape for changing the direction of the mail formed on the opposite side cover, and the direction is changed from the linear direction to the rotational direction again. l and orbital platform 29
The mail rolling surface returns to 7-10 and 32-35, and the load?
- becomes B1. Thereafter, the alignment cycle is repeated using the same operation.

In the present invention having the above configuration and operation, the side cover is of a split type with two segments, and the rlL
By reducing the size of the molded product and simplifying its shape, it is not only easier to set the heating and pressurizing conditions associated with the flow of the melt and hardening, but also to create a molded product with a structure that matches the shape and capacity of the molded product. It becomes possible to manufacture a mold, prevent the occurrence of distortion, and achieve the same dimensional accuracy. Therefore, it is possible to smoothly change the direction of the wheel in *IIS. - It can ensure smooth alignment circulation of the wheels. In addition, the bottom shape of the side cover can be easily machined, helping to reduce costs. On the other hand, the retainer is also formed into a split type consisting of two segments, making it easy to position the mold and 9, and to remove the breather during press molding. As a result, the machining time is greatly reduced, which is effective in reducing costs. In addition, since the cage can be machined accurately, the machining accuracy can be increased, and as a result, the holding tFK load 1 will not cause interference with the I-le, and will not cause any interference. - maintain smooth aligned circulation of the wheels; Furthermore, a sealing member is attached to the rear opening and the lower opening of the bearing main body to prevent foreign objects from entering the bearing main body, so there is no possibility that the alignment and circulation of the balls will be disturbed by birds. Furthermore, we were able to increase the rigidity of the retainer by forming the Makubo Shinki into a truncated MW shape, making it possible to manufacture bearings that are long in the axial direction.9. W-shaped track
The fixing of the cage is completed simply by engaging both ends of the cage having an r-shaped surface with the lock #lK of the side cover, which has numerous effects such as extremely simplifying the assembly of the bearing unit. .

[Brief explanation of drawings]

The drawings show embodiments of the present invention, so Fig. 1 is a front view of a four-sided uniform load type linear bearing according to the present invention, Fig. R2 is a side view of the same, and Fig. N43 is a vertical sectional view taken along the line A-A in Fig. 1. , @Figure 4 is a vertical cross-sectional view taken along line B-B in Figure 2,! Figure 5 is @Figure 4 C-C41
Vertical sectional view, Figure 6 is a front view of the bearing body, Figure 1R7 is a side view of the same, Figure 8 is an enlarged view of the 6Fj AD section, Figure 9
The figure is a rear view showing the circular surface of the side cover, and figure 910 is @ figure g-E
@End view, @l1 is a perspective view showing the circular surface of the side cover, I & 1
Figure 2 is Figure 9)''-FM developed view, Figure 13 is a front view of the cage, Figure N14 is a side view, Figures N15 and Tsuru 16 are g11 cross-sectional views at section G in Figure 13, and Figure 17 is a cross-sectional view of section G in Figure 13. Figure 438 is a front view of the side seal plate, Figure 19 is a cross-sectional view taken along line H-HI of Figure 17, Figure N20 is a perspective view of the axial seal plate, and Figure N21 is a front view of the track base. Explanation of symbols l... Bearing body 2, 17... Hollow recess 3
．． 4.18m, 18b...Skirt portions 5, 6, 1
9 m, 19 b - groove 7.8, 9, 10,
32, 33, 34, 35...? -Role rolling surface 11.12, 13.14... Hole for escape goal 15.1
6... Side cover 20m', 20m', 20b', 20b' - U-shaped groove for ball direction change 21m, 21b... Locking @
23.24--Retainer 23a, 24m--Slits 23b, 24b...Tang pieces 25.26...Side seal plate 27.28...Axial seal plate 29...Railway 30, 31... Projection B1
... Loaded ball B, ... Unloaded ball x
, x'...Horizontal edge Y, Y'...Intersection line a, at...Intersection angle β, β'...Contact angle 0...Bearing body center 01...Side cover center Patent application Hiroshi Teramachi

Claims (4)

[Claims] (1) A block body having a U-shaped cross section with skirt parts on the left and right sides sandwiching a central recess in the lower center, and the inner peripheral side surface of the skirt part has a radius of curvature that is approximately the same as the diameter of the mail. In addition, an arbitrary number of rolling surfaces extending in the axial direction are provided, and the ? - a bearing body having the same number of relief holes extending in the axial direction parallel to the ball rolling surface and extending through the solid portion of the skirt located outward from the ball rolling surface; A pair of front and rear tires are fixed to the front and rear end surfaces of the bearing body and have an inner circumferential shape similar to the inner circumferential shape of the bearing body. - A U-shaped groove for changing the direction of the mail connecting the hole for the mail, and a substantially W-shaped locking sieve that crosses the starting end of the U-shaped groove for changing the direction of the mail, respectively, are installed in the width direction on the inner surface of the lid. The divided side cover has a substantially W-shaped cross section, and has a slit on an inner inclined surface that corresponds to the rolling surface of the main shaft of the bearing, and has both ends thereof engaged with the locking groove of the side cover. A pair of cages and the ds of the bearing main body
- Corresponds to the mail rolling surface and has a radius of curvature that is approximately the same as the mail diameter? - a 9-way raceway formed above and below the left and right protrusions, a mail that circulates and is interposed between the mail raceways of the bearing main body and the way, and an opening of the bearing body; A four-way load type linear bearing characterized by consisting of a nine-seal machine. (2) The four-way load type linear bearing according to claim 1, wherein the skirt portion of the bearing body is shortened in the vertical direction and expanded in the width direction. (3) Bearing base salary and track base? - Claims characterized in that the contact angle of one wheel with the rolling surface is approximately 45 degrees! Four-way uniform load type linear bearing described in Section 1141. (4) A four-sided uniformly charged linear bearing according to claim 1, characterized in that a tongue piece is formed at the slit end of the retainer.