JPS61223325A - Linear bearing unit - Google Patents

Abstract

PURPOSE:To easily apply a preload onto load balls by deeply forming orbital grooves onto the inner peripheral surface of an outer cylinder and suppressing the application of an edge load into the orbital groove. CONSTITUTION:Balls are charged successively into between a groove for escape balls on the edge surface and the orbital grooves on an outer cylinder. A slit 224 is formed in parallel to a spot facing 227 formed onto the rib 228 on the side wall of a bearing case 200, and the upper limit 237 is positioned between the upper and lower grooves 212 and 214 for escape balls, and the lower limit 238 divides the lower wall 239 of the bearing case 200. Therefore, the right side of the slit 224 is deflected by the advance of a hexagon headed bolt 226, and a preload can be applied easily onto the orbital groove for load balls.

Description

[Detailed Description of the Invention] The present invention relates to improvement of a linear bearing unit υ,
A U-shaped escape ball #4 is formed in the inner cavity of the bearing case 0, which can reciprocate while supporting the slide surface of each machine tool, table side of industrial machinery, etc. or the conveyor IT. and the inner cavity K11
This invention relates to a linear bearing unit in which an outer cylinder formed in the 1-mt inner circumferential direction corresponding to the 91-way width of a t-way platform is fixed together via a flat key, and the above-mentioned track platform is fitted and inserted via a ball.

Generally used linear bearings are ball pushing types, so they can support verticality of 1, or only a fraction of that for moment loads and upward loads.
I can only load it.

Therefore, in order to solve the above-mentioned defects, the inventor of the present invention provided a bearing body with ball rows arranged oppositely on the left and right sides in the axial direction, and provided a U-shaped #1f for changing the direction of the balls corresponding to the ball rows on the end face of the bearing body. :A linear bearing with a retainer was developed in which the formed l1lI lid was fixed by acupuncture. (Refer to Japanese Unexamined Patent Publication No. 52-72912 M@) However, when changing the length of the bearing body of a linear bearing, it is comparatively easy to manufacture the retainer to the same dimensions, and it is possible to produce a wide variety of products in small quantities. This type of bearing is produced in large numbers and has a low cost and durability.

Additionally, linear bearings are generally provided with an appropriate clearance and preload depending on the application.

However, it is considered extremely difficult to apply preload after setting in various machines.

In addition, it is known whether there is a focal-end circulation system using a drum-shaped rolling element with concave rolling surfaces, or a linear motor, -john, roller, or υ bearing, which is installed in a distributed manner around an annular body consisting of several parts. (Japanese Unexamined Patent Publication No. 54-40951 @ Publication Reference It@) However, the roller bearing has a turn N & groove formed on the inner surface of the cylindrical body, and a supporting sleeve nib is fitted, and the outer surface of the supporting sleeve is fitted with a rolling groove. A linear no-load track groove is formed to return the moving body by no-load body movement, and the inner surface has a linear negative track groove to support the rolling element.
Since the vL trajectory is formed, is it effective for φ that is convenient for use in places where there is no need to consider, or for simple vertical loads that do not involve torque? Great for machine tools, industrial machinery, etc. that spray small amounts of oxidation.

Moreover, both ends of the curved surface that supports the hourglass-shaped rolling element within the load zone are supported by the inner surface of the support sleeve, and the curved surface at the center part is supported by the outer circumference of the shaft, so that it does not match the curved surface of the rolling element. It is extremely difficult to form a curved surface on both the support sleeve and the shaft due to the grinding technique, and it is also difficult to form a curved surface on both the support sleeve and the shaft. It is impossible to support fr.

An object of the present invention is to form a relief ball tSt in the linear bearing unit (5) in which the bearing performance does not deteriorate even if the retainer is omitted, that is, in the bearing case, and 5. By forming deep raceway grooves on the circumferential surface. In addition to increasing the contact area between the load ball and the raceway groove,
llll! By connecting #1 and the center, the formation angle is formed at a right angle, and the angle is 11X! ! In addition to not applying force or Tsuji load (also known as edge extreme pressure load) to the grooves, it is also possible to apply preload (also known as preload) to the load balls in the four groove rows. Our objective is to provide and provide a near bearing unit.

Another object of the present invention is to form a single path SR on the inner peripheral surface of an outer cylinder that fits into the bearing case, and to provide side covers (also referred to as return plates) fixed to both end surfaces of the bearing case. An annular concave groove that matches the annular protrusion formed on the outer end surface, a υ mouth part for changing the direction of the medium-force ball that matches the four rows of hooks on the outer cylinder, and a tongue piece on the track side are formed. The objective is to provide a linear bearing unit t-*.

Furthermore, another object of the present invention is to form a circular inner cavity in a bearing case or a rectangular square piece, and insert U-shaped relief balls #4 in the inner cavity at predetermined angular intervals on the same circumference in the long sleeve direction. 4 stripes are formed parallel to each other, and the outer cylinder is roughly arranged without any movement (
Even if there is an error in indexing) or an error in the raceway groove of the track, the retainer can be eliminated and the R-shape I linkage can be formed deeper, so the contact area can be widened and the rigidity and feel can be improved. Linear bearing unit t' that can hold the whole thing and at the same time easily apply preload! It is to serve JL.

Preferred embodiments of the present invention will be described below with reference to the drawings.

□ The bearing case 200 is made of a rectangular steel material with a cylindrical inner cavity 211 extending in the longitudinal direction of the center thereof, and a cross section U extending radially from the inner peripheral surface of the inner cavity 211 to the same diameter as the ball. There are four relief ball grooves 212 to 215 in the axial direction.
The striations are chipped.

These escape balls 17212 to 215 are processed simultaneously, for example by broaching.

The left and right escape ball lagoons 212 and 213 of the escape ball chicks 212 to 215 are 45 points with respect to the horizontal line x-X' passing through the center O1 of the unloaded ball or bearing case 200.
The relief balls #214 and 215 on the lower left and right sides are either unloaded balls or are arranged symmetrically at 15 degrees with respect to the horizontal line x-X'. It is formed.

Reference numeral 216 denotes a hole formed between relief balls 6212 and 213 in the direction of the solid axis.

213 to 234 are formed in the long sleeve direction of the inner circumferential surface 221 of the outer cylinder 220 and have a nine-R shape for the load ball IIIXi! -And,
The load ball tracks XII#f231 to 234 have approximately the same radius of curvature as the balls, and are located on the left and right sides of the upper part of the cough track.
, 232 or horizontal 1X-X passing through the center O of the outer cylinder 220
are arranged symmetrically at 45 degrees to ', and
a Appropriate age lower left and right 233.234 is the center 0 of the outer cylinder 220
They are arranged symmetrically at a position 15i with respect to the horizontal line x-X' passing through.

Reference numerals 106 and 107 denote annular convex portions for ball return guides formed on both end surfaces of the outer cylinder 220, and the convex portions 106°1
The outer peripheral edge 213 of the bearing case 200 is formed at a location where it can be easily removed from the inner peripheral edge 222 of the bearing case 200.

223 is a keyway formed on the outer peripheral surface of the outer cylinder 220.

224 is a slit cut in the axial direction of the bearing case 200, and a large hexagonal locking bolt 226 is inserted into a screw hole 225 formed perpendicular to the surface of the slit 224.

Next, 122.123 is the front and rear end surfaces 23 of the outer #I]220.
5.236 without 1111 made of plate, said 011
The outer cylinder 220 is located on the inner surface of the I plow 122 and 123.
An annular convex portion 106 formed on the front and rear end surfaces of the
4 part 129 corresponding to 07 and 11 Gaisho 220 load ball Sendokai 231-234 L and bearing case 2
U-shaped curves m 130-133 for changing the direction of the ball are integrally formed in order to match the heat 212-215 for the escape ball with no load.

Reference numerals 134 to 137 are knife-shaped ball guide tongues formed on the side plows 122 and 123, and these tongues are formed below the direction change 0-shaped bent portions 130 to 133.
17) Iffl Pottery 231-234, 111111
Base 13B OIll Groove 139-142 rlJ+
The load ball 143 running on the bearing case 200
This is for guiding the unloaded balls to the escape ball bowls 212 to 215 from the sub-linear direction to the rotating direction.

Also, large mounting holes are formed at required locations on the flat portion.

The track base 138, in which the raceway grooves 139 to 142 are formed with a radius of δ, is aligned with the center 0 of the bearing case 200 by centering the square pieces.

After that, vertical parallel vIJ148.149 and left and right parallel surfaces 150.151 are formed, and with these as the processing reference direction, the upper left and right single hooks 139°140 are aligned with the horizontal line x-X' passing through the center 0 of the prefectural road platform 13B. On the other hand, on the 45 degree line, the lower left and right 1 way $ 141 and 142 are also the horizontal line x
A pitch circle diameter (p, c
, d) Concave +11 dots 139 to 142 having the same radius of curvature t- are formed where they intersect with a.

165.166 is raceway groove Ij 139.141 and 1
The inclined surface 152 formed between 40 and 142 is large enough for mounting.

153 to 157 are 1'llll of the side lid 122.123
711 sides and sides.

158 and 159 are throats for fixing side bolts 122 and 123 to both end surfaces of the bearing case 200.

227 is sitting υ, 228 is pari/guke.

229 is a locking nut screwed onto the locking bolt 226.

230 can be accessed using a flat key.

When assembling the ridge linear bearing unit, first insert the screw 158 into one end surface 235 of the bearing case, 290.
Attach the C-side cover 122 through the bearing case 200, then fit the flat key 230 into the inner cavity 211 of the bearing case 200, and then install the track base 138 with a length of F) l. Insect God Seshimuru.

In this state, the escape ball on the other end face 236, the groove 2
12 to 215, the trajectory of the outer cylinder 220-231 to 234, and the trajectory tracking chicks 139 to 139 on the track platform side. Between 142 and 3. ,1
So... f: + [Next filling, II with screw 159! 14
1μs! Install.

In the linear bearing unit assembled and constructed as described above, the load ball morning path #1 is formed on the outer cylinder instead of being formed directly on the bearing case.

Therefore, the inner peripheral surface of the inner cavity of the St-bearing case for escape balls can be formed in the radial direction very easily by machining such as a broach.

The slit 224 is formed in the lip 228 of the side wall of the bearing case 200 and is parallel to the 'fc counterbore 227, and the upper limit 237 is for the vertical relief ball #1.
212 and 214, and the lower limit 238 cuts the bottom of the bearing case 200 @239t''.

Therefore, as the hexagonal bolt 226 advances, the slit 224 turns and the right side is bent, and a preload is applied to the load ball raceway groove.

In addition, since there is no retainer vI-WL, it helps to reduce the number of parts and reduce the cost. Therefore, large load capacity glue,
A special feature that makes it easy to manufacture a linear bearing unit with a small t 19 1 load capacity and a large number of 18I from the near bearing unit! have

烹田, ψll line above and below, forming parallel planes of the square cloth.

After that, the 4th line of motion r#kin is formed. ,.

[Brief explanation of the drawing]

The 11th V is in the side surface of the linear bearing unit of the present invention,
Figure 2 shows the positive I of Figure 1 [Figure 1, Figure 3. The figure is Figure 2 B-B
Line cross-sectional view, Figure 4! Figure 3 is a sectional view taken along lines C and -C, and Figure 5 is a partially sectional side view of the bearing case of the present invention. Figure 6 is the same as Figure 5 and the exact figure, Figure 7 0) is the front view of the outer cylinder, Figure 7 (→
is a side view of the outer cylinder, and Figure 8 is the track. It is a sectional view of the platform. . 200: Bearing case, 211: Circle 1, cylindrical lumen. 212-215; For escape bow @, 216: Keyway 23
17234: Load ball channel #415224; Slit 225: Screw hole 2n: Counterbore surface □

Claims (1)

[Claims] In the cylindrical bore (211) of the bearing case (200) having an open end at the bottom, relief ball grooves (212 to 215) having a U-shaped cross section and having substantially the same diameter as the balls are provided. Four grooves are formed in the axial direction, and the escape ball groove (21
A key groove (216) is formed in the axial direction between the left and right upper parts of the outer cylinders (2 to 215), and the outer cylinder (220) is fitted into the key groove (216) via a key (230). A bearing case (200) in which four R-shaped load ball raceway grooves (231 to 234) having substantially the same radius of curvature as the balls are formed in the axial direction on the inner peripheral surface of the bearing case (A). A slit (224) is formed on the outside of the escape ball groove (214) in the axial direction from the end face of (200). (B), a screw hole (22
5) One end is opened into the slit (224). (C), Upper left and right load ball raceway grooves (231), (
232) are arranged symmetrically with respect to the horizontal line XX' passing through the center of the bearing case (200) at an angle approximately 1/2 right angle. (D), lower left and right load ball raceway grooves (233), (
234) is less than 1/2 angle with respect to the horizontal line X-X' passing through the center of the bearing case (200).
Arranged symmetrically at an angle of degrees. (E) Annular convex portions (106 to 107) are formed on both end surfaces of the outer cylinder (220) continuously to the edges of the load ball raceway grooves (231 to 234). (F) The side covers (122, 123) fixed to the end face of the bearing case (200) have an annular recess (129) that matches the annular convex portion (106-107) of the outer cylinder (220). ) is formed. (G), U-shaped recesses (130-133) for changing the direction of the ball that cross the annular recess (129), and tongue pieces (134) for guiding the ball below the U-shaped recesses (130-133) for changing the direction of the ball. ~137) are integrally formed. (H), the load ball raceway groove (2) of the outer cylinder (220);
R-shaped raceway grooves (139 to 31) facing oppositely to each other (139 to 234)
A track (138) in which four stripes (141) are formed in the axial direction connects to the bearing case (200) via balls (143).
) A linear bearing unit characterized by being fitted into a.