JPS6223166B2 - - Google Patents

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a linear sliding bearing in which a bearing body is attached to a way so as to be slidable in the longitudinal direction via a large number of steel balls. The present invention relates to a ball retainer that is disposed between the bearing body and the bearing body to guide the rolling operation of the steel balls, and also holds the steel balls against the bearing body when the track base and the bearing body are separated.

(Prior art) Conventionally, as such a ball holder, the first
As shown in the figure, one is known that is formed by suitably bending a single elongated metal plate in which elongated holes 2a, 2a for guiding and holding steel balls 1, 1, etc. are bored in the longitudinal direction. Usually, in such a metal ball holder 2, raceway surfaces 5a, 5b, formed opposite to the bearing body 3 and the track 4 at both ends of the elongated holes 2a, 2a; Steel ball 1 rolling in the loaded ball groove formed by
1... are integrally provided with scooping tongues 7, 7 for guiding them toward the no-load ball holes 6, 6 formed in the bearing body 3. However, since the scooping tongues 7, 7 are also metal, the steel balls 1, 1
When scooping up..., there was a problem in that the steel balls 1, 1... and the tongues 7, 7 came into contact and collided with each other as metals, causing a large noise.

Therefore, in order to suppress the generation of such noise, it has been proposed that the entire ball holder 2 is made of synthetic resin, as shown in Fig. 2. However, this conventional ball holder made of synthetic resin 2 has inferior rigidity compared to metal ones, so the intermediate part 2b is bent and the steel balls 1, 1... and the elongated holes 2a, 2a of the cage 2
and the peripheral wall of the rim, which tends to cause interference. Therefore, in order to solve this problem, if the number of fixing points for the ball holder 2 is increased, the number of assembly steps increases accordingly, which increases the cost.In addition, in order to increase the rigidity of the middle part 2b of the ball holder 2, only that part is made thicker. Then, there was a problem in that the durability of the ball holder 2 was deteriorated due to distortion occurring at the connection portion with the thin wall portion and contact between the steel balls 1, 1, . . . and the holder 2.

(Object of the Invention) Therefore, the present invention attempts to solve the above problems of the conventional ball retainer, and its purpose is to provide a retainer that extends in the longitudinal direction in the intermediate portion of the retainer made of synthetic resin. By forming a mating protrusion and fitting and fixing the mating protrusion into the mating groove provided on the bearing body, it is possible to prevent the intermediate portion of the retainer from deflecting and to accurately position the retainer. In addition, the engagement protrusions formed in the longitudinal direction strengthen the rigidity of the intermediate portion of the retainer, and when attaching the retainer to the bearing body, other fixing devices such as set screws are omitted, reducing costs. The goal is to bring things down.

(Structure of the Invention) In order to achieve the above object, the present invention provides a retainer mounting groove provided in a bearing body having a central engagement groove and a side engaging groove extending in the longitudinal direction, An engaging protrusion extending in the longitudinal direction is provided on a side surface of the member, and the engaging protrusion is engaged with the central engaging groove of the bearing body, and one side of the ball retainer is fitted into the side engaging groove. The ball holder is configured to be elastically attached to the holder attachment groove by engaging the ball holder and elastically deforming the ball holder.

(Example) The structure of the present invention will be described below based on the illustrated embodiment. First, FIG. 3 shows a linear sliding bearing incorporating a ball retainer 2 according to the present invention. In FIG. 3, a bearing body 3 having a groove 10 formed in the lower part is fitted in the upper part of the way 4 so as to be slidable in the axial direction, and each side of the upper part of the way 4 has a cross section. arc-shaped 2
The load ball raceway surfaces 5b, 5b of strips are formed, and also on the inner surface of the concave groove 10 of the bearing body 3, the cross section is circular, facing the load ball raceway surfaces 5b, 5b of the way base 4, respectively. Two arc-shaped load ball raceway surfaces 5a, 5b are formed, and these mutually opposing raceway surfaces 5a, 5b form two load ball grooves 5, 5 on each track base 4. A large number of steel balls 1, 1, . . . are arranged in these load ball grooves 5, 5, which are formed on the side portions, respectively.

In addition, as shown in Fig. 4, the bearing body 3
Front and rear end plates 11, 11 are fixed to the front and rear end surfaces of the , with bolts 12, 12 (Fig. 3), and the inner surfaces of these end plates 11, 11 are provided with bolts as shown in Fig. 5. , the load ball grooves 5,5; 5,5,
Guide grooves 13, 13; 13, which extend approximately in the radial direction and connect to the corresponding non-load ball holes 6, 6; 6, 6, which are bored in the bearing body 3 in the axial direction;
13 is formed. Each of the end plates 11, 11 is formed to have substantially the same cross-sectional shape as the bearing main body 3, and a locking groove 15 is formed in the inner wall surface of the recess 14 over the entire circumference thereof.

In FIG. 5, reference numeral 16 indicates an axial lubricating oil supply hole drilled in each end plate 11; 17 indicates an oil supply hole 1.
6 and the guide grooves 13, 13; 18 is an insertion hole for the bolts 12, 12;

As is clear from FIG. 3, between the sliding table 4 and the bearing body 3, there is provided a structure according to the present invention that guides and holds a large number of steel balls 1, 1, . . . rolling in load ball grooves 5, 5. A retainer 2 is provided. The structure of the retainer 2 will be explained below with reference to FIG. 6. The retainer 2 has a substantially rectangular side surface, a hollow trapezoidal cross-sectional shape, and an engaging protrusion extending in the longitudinal direction. an intermediate section 21 having 20;
and both side portions 22, 22 extending from both sides of the intermediate portion 21 at a certain angle (approximately 60 degrees in the illustrated example), and the both side portions 22, 22 are provided with elongated holes extending substantially over the entire length in the longitudinal direction. 24, 24 are bored respectively, and these long holes 24, 24 accommodate and hold the steel balls 1, 1... rolling in the load ball grooves 5, 5, and for this reason, the long holes 24, 24 are The cross-sectional shape is a semi-ellipse (FIG. 6), that is, the bottom cross-section is narrowed into an arc shape.

End surfaces 22a, 2 of both sides 22, 22 of cage 2
2a and the side surfaces 20a, 2 of the engaging protrusion 20 on the sides separated from the end surfaces 22a, 22a, respectively.
0a is formed so that the cross section exhibits a tapered shape that expands outward in the radial direction, that is, a V-shape.

In addition, end plates 11, 11 are provided at both ends of the cage 2.
Tapered locking pieces 25, 25 that can be locked in the locking grooves 15, 15 are integrally formed, and between both end edges of the retainer 2 and both ends of the elongated holes 24, 24, i.e. Middle part 21 and both ends 2 of retainer 2
Arc-shaped reinforcing ribs 26, 26; 26, 26 projecting inward are integrally provided on the inner surface side of the joints with 2, 22 [Fig. 6C], and these reinforcing ribs 2
6, 26; 26, 26 is designed to reinforce the portion where the rigidity has been reduced due to the formation of the elongated holes 24, 24. Moreover, on the inner surface of each reinforcing rib 26,
An arcuate ball scooping surface 27 is formed, and the ball scooping surface 27 scoops up the steel balls 1, 1, . It is guided by the guide groove 13.

In addition, as shown in Fig. 3, the bearing body 3
A ball retainer 2 is provided on both shoulders of the inner circumferential surface of the recess 14.
Cage mounting grooves 30 for arranging the cages are formed in the longitudinal direction, and each cage mounting groove 30 has a cross-sectional shape substantially equal to the outer surface shape of the cage 2. At the center of the container mounting groove 30, an engaging protrusion 20 on the outer surface of the intermediate portion 21 of the cage 2 is provided.
A central engagement groove 31 is formed in the longitudinal direction to fit and fix the retainer, and at one end of the retainer mounting groove 30,
A side engagement groove 32 that engages with one side 22 of the retainer 2
is formed. The side wall of the side engaging groove 32 and the side wall 31a of the central engaging groove 31 on the side remote from the side wall are formed so that the cross section thereof has a tapered shape, that is, a V-shape that expands outward in the radial direction. .

Now, in order to attach the retainer 2 to the bearing body 3, the engaging protrusion 20 of the intermediate portion 21 of the retainer 2
is fitted into the center engagement groove 31 of the cage mounting groove 30 of the bearing body 3, and one side portion 22 of the cage 2 is fitted into the side engagement groove 32 of the cage mounting groove 30 to hold it. Applying compressive force to container 2, retainer 2
is elastically deformed and its restoring force is used to elastically support the retainer mounting groove 30. In this state, the locking grooves 15, 15 of the end plates 11, 11 are locked to the locking protrusions 25, 25 at the longitudinal ends of the retainer 2,
The end plates 11, 11 are fixed to the bearing body 3 with bolts 12, 12, . . . .

Now, the operation of this embodiment will be explained. When the bearing body 3 is moved relative to the track 4, the steel balls 1, 1, .
4, 24 while rolling in the load ball grooves 5, 5, and when reaching the ends of the load ball grooves 5, 5, the rollers are formed at the ends of the elongated holes 24, 24 of the cage 2. The guide groove 13 in one end plate 11 is scooped up by the ball scooping surfaces 27, 27.
through the no-load ball holes 6, 6 in the bearing body 3, and from there through the no-load ball holes 6, 6 into the guide groove 13 in the end plate 11 on the opposite side.
The ball is returned to the load ball grooves 5, 5 via. During this circulation of the steel balls 1, 1..., the steel balls 1, 1...
When the ball comes into contact with the ball scooping surfaces 27, 27 and is scooped up, noise generation can be suppressed since the ball scooping surfaces 27, 27 are formed of synthetic resin. Further, the intermediate portion 21 of the retainer 2 is fixedly held by engagement between the longitudinally extending engaging protrusion 20 and the central engaging groove 31 of the retainer engaging groove 30 of the bearing body 3, and the engaging protrusion 20 itself also works as a reinforcing rib, the rigidity of the intermediate portion 21 of the cage 2 is significantly increased, and no bending deformation occurs.
4, 24 are deformed or twisted, and the steel balls 1, 1...
does not provide significant frictional resistance. Therefore, the steel balls 1, 1, . . . can easily roll in the loaded ball grooves 5, 5, and the bearing body 3 can move easily and at high speed.

(Effects of the Invention) As described above, according to the first invention, an engaging protrusion extending in the longitudinal direction is provided on the outer surface of the intermediate portion of the synthetic resin ball holder, and the engaging protrusion The ball retainer is engaged with a central engagement groove of a retainer mounting groove formed in the bearing body, and one side of the ball retainer is engaged with a side engaging groove of the retainer attaching groove. Since the ball retainer is elastically attached to the retainer mounting groove by elastically deforming the retainer, it is possible to effectively prevent deflection of the intermediate portion of the retainer and to position the ball retainer extremely accurately. And it can be done easily. Therefore, bending deformation of the intermediate portion of the cage can be avoided, thereby preventing interference between the steel balls rolling in the long holes of the cage and the side walls of the long holes, thereby ensuring easy rolling of the steel balls. In addition, it is possible to prevent abnormal wear of the cage due to contact between the steel balls and the cage, thereby extending its life. In addition, the engagement protrusions formed in the longitudinal direction can strengthen the rigidity of the intermediate portion of the retainer, and when attaching the retainer to the bearing body, the elastic force of the retainer itself can be used to It can be fixed to the main body and does not require any other fixing devices such as set screws.
It is possible to reduce costs by reducing assembly man-hours.

Furthermore, according to a second invention, in addition to the configuration of the first invention, the side walls of the central engagement groove and the side engagement grooves on the sides separated from each other have cross sections that widen outward in the radial direction. The ball retainer is formed to have a widening V-shape, and one end face of the ball retainer and the side face of the engaging protrusion on the side separated from the end face of the ball retainer are formed so that the cross section thereof is on the side wall of the central engaging groove and the side engaging groove. The ball holder is formed to have a corresponding V shape, and the side surface of the engagement protrusion is engaged with the side wall of the central engagement groove of the bearing body, and the one end surface of the ball holder is engaged with the side wall of the center engagement groove of the bearing body. Since the ball retainer is engaged with the side wall of the bearing body, the ball retainer can be securely held in the retainer mounting groove of the bearing body, and the ball retainer can be reliably prevented from coming off.

[Brief explanation of the drawing]

Figure 1 is a front view of a linear sliding ball bearing equipped with a conventional metal ball holder. Figure 2 is a front view of a linear sliding ball bearing equipped with a conventional synthetic resin ball holder. Figures 3 to 6 show a linear sliding ball bearing equipped with a synthetic resin ball holder according to the present invention. Figure 3 is a partially cutaway front view of the bearing, Figure 4 is a side view of the bearing, and Figure 5 shows the end plate removed from the bearing body, Figure 5a is its front view, Figure 5b is a sectional view taken along line B-B of Figure 5a, and Figure 5c is Figure 5a. C-
5d is a sectional view taken along line D-D in FIG. 5a, FIG. 6 shows the ball retainer of the present invention, and FIG. Line sectional view, 6th
Fig. 6b is a view taken in the direction of arrow B in Fig. 6a, Fig. 6c is a side view thereof, Fig. 6d is a sectional view taken along line D-D in Fig. 6b, and Fig. 6c is a side view thereof.
Figure e is a view taken along arrow E in Figure 6a. Explanation of symbols, 1, 1... Steel ball, 2... Ball holder, 3... Bearing body, 4... Track base, 2
0... Engaging protrusion, 20a... Side surface of engaging protrusion, 2
DESCRIPTION OF SYMBOLS 1... Middle part, 22... One side part, 30... Cage mounting groove, 31... Center engagement groove, 31a... Side wall of the center engagement groove, 32... Side engagement groove.

Claims (1)

[Scope of Claims] 1. A bearing body is attached to the way so as to be slidable in the longitudinal direction via a large number of steel balls, and a synthetic resin is provided between the way and the bearing body to guide the rolling of the steel balls. In a linear sliding ball bearing in which a ball retainer made of aluminum is disposed and a retainer mounting groove is formed in the bearing body, the retainer attaching groove has a central engagement groove and a side engagement groove extending in the longitudinal direction. an engaging protrusion extending in the longitudinal direction is provided protrudingly on the outer surface of the intermediate portion of the ball retainer, and the engaging protrusion is engaged with the central engaging groove of the bearing body; A ball holder, wherein the ball holder is elastically attached to the cage mounting groove by engaging one side of the ball into the side engagement groove and elastically deforming the ball holder. 2. A bearing body is attached to the track so as to be slidable in the longitudinal direction via a large number of steel balls, and a ball retainer made of synthetic resin is provided between the track and the bearing body to guide the rolling of the steel balls. In the linear sliding ball bearing in which a cage mounting groove is formed in the bearing body, the cage mounting groove has a central engagement groove and a side engagement groove extending in the longitudinal direction. The side walls of the mating groove and the side engaging groove that are spaced apart from each other are formed so that the cross section has a V-shape that widens outward in the radial direction, and the outer surface of the intermediate portion of the ball retainer an engaging protrusion extending in the longitudinal direction is provided protrudingly on the ball holder, and a cross section of the ball retainer is connected to one end surface of the ball retainer and a side surface of the engaging protrusion on the side separated from the end face of the ball retainer, and a cross section of the ball retainer is connected to the central engaging groove and the side engaging groove. is formed to have a V-shape corresponding to the side wall of the ball holder, and the side surface of the engaging protrusion is engaged with the side wall of the central engaging groove of the bearing body, and one end surface of the ball holder is formed in a V shape corresponding to the side wall of the bearing body. A ball holder, wherein the ball holder is elastically attached to the holder mounting groove by engaging with a side wall of an engagement groove and elastically deforming the ball holder.