JPS628425Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is a ball bearing block body of a linear ball bearing used for the table side of a machine tool, a sliding surface of a machining center, or a part of a conveyance device that supports heavy objects and moves back and forth, and a non-load ball. This invention relates to an improvement of a side cover with a retainer that guides the holder.

Generally, in the bearing body of a linear ball bearing, a substantially trapezoidal hole is formed in the axial direction from a rectangular steel material, and then a hook-shaped receiver is formed by cutting off the lower part of the trapezoidal hole into an isosceles triangle shape. The branches are formed symmetrically. (Tokukai Akira
55-109820) Therefore, the material for the bearing body is completed only after the process of forming a specially shaped through hole by turning the center of the steel material, and then the turning process of cutting off the lower center.

Therefore, one of the reasons for high costs is the deterioration of profitability due to material costs due to chips generated in the turning process, the time required for machining, and the consumption of cutting oil.
It's becoming one.

In addition, since the side covers attached to both sides of the bearing body are made of steel like the bearing body, chips generated during turning of the U-shaped groove for changing the direction of the ball will reduce profitability and reduce machining costs. Time is one of the high cost factors,
Moreover, it is also inefficient.

Furthermore, the retainer to be incorporated into the bearing body is manufactured from a steel plate by press molding into the desired shape. (Japanese Patent Laid-Open No. 54-145837) However, during press forming of a steel plate, the cage is formed by forming axial slits at required locations and relatively small tongues protruding from the front and rear of the slits for scooping up balls. Therefore, the small tongue piece is required to have correspondingly high strength and wear resistance.

Therefore, it is necessary to use a steel plate with high toughness and to perform a heat treatment process after forming.

In order to eliminate the above-mentioned defects, the present inventor previously filed a patent application (Japanese Patent Application No. 124821/1983). To summarize the invention, the bearing block body is made by forging or precision casting and has a depression having a substantially trapezoidal cross section in the center.
Skirts are formed on the left and right sides, and the retainer and side cover, which are not subject to vertical loads, thrust loads, and uplift loads (upward loads), are made of oil-impregnated thermosetting plastic material, die-cast alloy, oil-impregnated sintered alloy, etc. This is a linear ball bearing unit in which a track base is built into a linear ball bearing that is integrally molded and has side covers with retainers inserted and fixed from the left and right sides of the bearing block main body.

However, since a no-load ball groove is formed in the axial direction on the outer periphery of the hook-shaped receiving portion of the bearing block body, a side plate must be attached to receive the large number of balls traveling in the no-load ball groove. No.

In addition, female threads must be formed at required locations on the hook-shaped receiving portion of the bearing block body in order to engage the screws with a plurality of screws for attaching the side plate to the bearing block body.

In addition, the cage that guides the four load balls is composed of a horizontal member, left and right inclined members, and left and right receiving members, and since the horizontal member and left and right inclined members are wide and thick, there is no problem in terms of strength. Since the left and right receiving members come into contact with the side surfaces of the bearing block main body, they are made narrower in width than the other horizontal members and inclined members, resulting in elongated receiving members, which is undesirable from the viewpoint of strength.

The purpose of this invention is to eliminate the above-mentioned drawbacks.
The left and right receiving members are formed to have a substantially U-shaped cross section, and the upper ends of the non-load ball side are placed opposite to the required locations on the bearing block body, so that the receiving members surround the hook-shaped receiving portion of the bearing block body. It is an object of the present invention to provide a linear ball bearing unit which has a high dustproof effect and is firmly held in the bearing block body.

Another object of the present invention is to provide a linear ball bearing unit in which the receiving member can support and guide a large number of unloaded balls, thereby eliminating the need for left and right side plates.

In addition, the left and right receiving members are integrally formed with the lid body with a retainer and can guide a large number of no-load balls, so it is possible to provide a linear ball bearing unit that eliminates the need for female threads for mounting the side plate. It is in.

A preferred example of the present invention will be described below based on the drawings.

10 indicates the entire bearing block body.

As shown in Figs. 3 and 4, the bearing block main body 10 is made of a material 11 made of steel by forging or precision casting, and has a depression 12 in the center with a substantially trapezoidal cross section;
Skirts 13, 14 and left and right bulges 15, 16 are integrally molded on the left and right sides of 2.

Next, the material 11 of the bearing block body is
The trapezoidal depression 12 of the material 11 is subjected to, for example, a turning or grinding process to form a top wall 17, left and right inclined walls 18, 19, and left and right open end surfaces 2, as shown in FIG.
Hook-shaped receiving portions 22, 23 having numbers 0, 21 are formed on the skirts 13, 14.

Next, load ball grooves 24 and 25 having substantially the same radius of curvature as the ball are formed on both sides of the top wall 17.
is formed in the axial direction, and left and right inclined walls 18,1
By forming the load ball grooves 26 and 27 below the bearing block 9, symmetrical load ball rows 24 to 27 are formed inside the bearing block body.

28 and 29 are load ball grooves 2 of the top wall 17;
The no-load ball holes 28 and 29 are formed in parallel with the balls 4 and 25, and the no-load ball holes 28 and 29 are somewhat larger than the balls and are formed to penetrate in the axial direction so that the balls can easily roll.

Reference numerals 30 and 31 denote non-load ball grooves formed in parallel to the load ball grooves 26 and 27 on the outer periphery of the rear side of the hook-shaped receiving portions 22 and 23 below the inclined walls 18 and 19; are formed in the axial direction of the outer circumference of the hook-shaped receiving parts 22, 23. 32 and 33 are screw holes;
are formed approximately at the center of the top wall 17 of the bearing block body 10 at a required interval, and the screw holes 32,
The side covers 34 and 35 with retainers inserted from both sides of the bearing block main body 10 are attached to the screws 38 and 33.
39. (See Figure 1) When the end faces of the side covers 34 and 35 with retainers are joined, screws 38 and 39 are inserted into the U-shaped notched holes 95 formed in the horizontal members 36 and 37 of the retainers. Then, insert the horizontal member 36 into the screw holes 32 and 33,
37 is fixed.

Reference numerals 40, 40, . . . are internal threads for attaching the retainer-equipped side covers 34, 35, and the internal threads 40, 40, . . . are formed on both end surfaces of the bearing block body 10.

Reference numerals 41 and 42 indicate no-load ball grooves 30 and 31 formed on the outer periphery of the hook-shaped receiving parts 22 and 23 on the rear side.
This is a concave groove formed parallel to the outer edge of the

In the grooves 41 and 42, the side cover 3 with a retainer is inserted.
4, 35 with approximately U-shaped cross sections left and right receiving members 48, 4
The upper end 45 of 9 is fitted and fixed.

Reference numerals 43 and 44 are inclined bottom wall surfaces of the hook-shaped receiving parts 22 and 23 of the side block main body 10.

Reference numeral 54 denotes a slit formed in the bulge 16 on the right side of the bearing block main body 10 as viewed in FIG. 5, and the slit 54 is formed to be inclined inward from the lower end of the bulge 16.

Reference numerals 55 and 56 denote counterbores formed on the left and right sides of the bulging portion 16 of the bearing block main body 10, and internal threads 57 and 58 are formed in the centers of the counterbores 55 and 56, respectively.

The female threads 57, 58 are formed to intersect the slit 54.

When the bulging portion 16 is pressed against the female screws 57 and 58 by the hexagonal hole setscrews 59 and 60 and the hexagonal nuts 61 and 62, respectively, the skirt portion of the bearing block body 10 is bent.

As a result, the gap between the load ball grooves in the bearing block body 10 is adjusted.

Reference numeral 63 denotes a grease guide hole formed from the right side of the bearing block main body 10 until it reaches the center.A female thread 64 for attaching the grease nipple 14 is formed on the outside of the grease guide hole 63, and the grease guide hole 63 is formed in the radial direction of the center. A guide hole 63 and grease supply holes 65, 65 are formed.

Reference numerals 66 and 67 are notches for ball guides, and the load ball grooves 24 and 2 of the bearing block main body 10
5, pass through the U-shaped grooves 70, 71 for ball direction conversion of the side covers 34, 35 with retainers to the no-load ball hole 2.
8 and 29 are formed on the front and rear end surfaces 68 and 69 of the bearing block main body 10 so that the bearing block body 10 can easily change direction.

72 and 73 are notches for ball guides, which are the load ball grooves 26 and 2 of the hook-shaped receiving parts 22 and 23.
7, pass through the U-shaped grooves 74, 75 for ball direction conversion of the side covers 34, 35 with retainers to the no-load ball groove 3.
They are formed on the front and rear end surfaces of the hook-shaped receiving parts 22 and 23 so that the direction can be easily changed to 0 and 31.

U-shaped grooves 70, 71 for ball direction conversion are located on the right and left centers of the side lids 34, 35 with cages, and are perpendicular to locations corresponding to the loaded ball grooves 24, 25 and the unloaded ball holes 28, 29 of the bearing block main body 10. , and the side lids 34 and 35 with retainers
U-shaped grooves 74, 75 for changing the ball direction on the lower left and right sides of the
are formed at locations corresponding to the loaded ball grooves 26, 27 and the non-load ball grooves 30, 31 of the hook-shaped receiving parts 22, 23 of the bearing block main body 10.

Horizontal members 36, 3 of side lids 34, 35 with retainers
Reference numeral 7 is located between the U-shaped grooves 70 and 71 for ball direction conversion, and is integrally formed to protrude in the axial direction from the end surfaces 77 of the side covers 36 and 37, and outer curved surfaces 78 and 79 are provided on both sides of the side lids 36 and 37, respectively. It is formed with approximately the same radius of curvature.

97, 97... are tongue pieces, and the tongue pieces 97 connect the ball direction changing U-shaped grooves 70, 71, 74, 75 and the bearing block body 10 to the load ball grooves 25 to 27.
is formed on the opposite side.

The tongue piece allows the ball 87 between the load ball grooves to be smoothly fed into or from the U-shaped groove between the load ball grooves.

Reference numerals 80 and 81 denote left and right inclined members of the side covers 34 and 35 with retainers, which are formed to protrude in the axial direction from the end surfaces 77 of the side covers 34 and 35, and the width of the outer inclined surface 83 is equal to the width of the inclined wall of the bearing block body. 18,19
The inner upper and lower curved surfaces 84 and 85 are approximately the same width as the outer curved surfaces 7 formed on the horizontal members 36 and 37.
8 and 79, and at the same time has a radius of curvature that prevents the ball 87 from falling off even when the track base 86 described later is removed.

As shown in FIGS. 1, 8, 9 and 14, 48 and 49 are left and right receiving members having a substantially U-shaped cross section for the side lids 34 and 35 with retainers, and the left and right receiving members 48 and 49 are connected to the left and right inclined members 80. , 81 as well as side lids 34, 35
The inner curved surface 88 of the vertical wall 52, 53 on the load ball side is formed to protrude in the axial direction from the end surface 77 of the bearing block body 10, and is formed to surround the outer peripheral wall of the hook-shaped receiving portion 22, 23 of the bearing block main body 10.
are formed symmetrically with the lower curved surface 85 of the left and right inclined members 80, 81, and the inverted L-shaped portions 46, 47 on the non-load ball side are connected to the non-load ball grooves 30, 31 of the receiving portions 22, 23. A guide groove 51 is symmetrically formed in the axial direction, and the inner surface of the bridge 76 between the vertical walls 52, 53 and the inverted L-shaped parts 46, 47 abuts the inclined bottom walls 43, 44 of the receiving parts 22, 23. .

Reference numeral 89 denotes locking pins formed on the horizontal members 36 and 37, which protrude toward the end surface of the bearing block main body 10, and locking pin holes 90 corresponding to the locking pins 89 are located at opposite positions. is formed.

Reference numerals 91 and 91 denote locking pins, which are formed protruding from the tip of the left inclined member 81 located on the left side toward the end surface of the bearing block main body 10, respectively, and are for locking pins corresponding to the locking pins 91, 91. Holes 92, 92 are formed in the right angled member 80.

Reference numerals 93, 93 are locking pins, which are connected to the right receiving member 49.
Locking pin holes 94 , 94 corresponding to the locking pins 93 , 93 are formed in the left receiving member 48 . 96 is side cover 3 with retainer
4 and 35, the mounting holes 96 are mounted to the female mounting threads 40 formed on both end faces of the bearing block body 10 via bolts 99. (See Figure 1) 98, 98... are recesses formed on the side lid sides of the side lids 34, 35 with cages, and the recesses 98 are useful for saving materials without reducing the mechanical strength of the side lids. It is something.

The track 86 has protrusions 10 on the upper left and right sides in the axial direction.
Load ball grooves 103, 104 having substantially the same radius of curvature as the balls corresponding to the load ball grooves 24, 25 formed in the bearing body 10 are provided on the upper wall surface 102 of the protrusions 100, 101.
are formed on the lower sloped surfaces 105, 106 of the protrusions 100, 101.
Load ball grooves 107 and 108 having substantially the same radius of curvature as the ball corresponding to ball 27 are formed.

Reference numeral 109 denotes a mounting hole used when mounting the track base 86 to a movable part or a fixed part of a machine tool or the like. Reference numeral 113 denotes female threads formed at required locations on the bearing block main body 10, and movable members such as machine tools, industrial machines, and office machines are attached via the female threads 113.

Each part of the linear ball bearing unit of the present invention is constructed as described above, so the assembly will be explained step by step.

First, after the side cover 34 with retainer is inserted into the bearing block body 10, the bolts 99, 99,
99, and then the horizontal member 36 of the retainer is fixed to the top wall 17 of the bearing block body 10 via screws 38.

Next, the no-load ball holes 28 and 29 of the bearing block body 10 and the no-load ball guide 51
and a large number of balls 8 between the no-load ball grooves 30 and 31.
7, 87, . . . are filled, and are filled up to the retainer through the U-shaped grooves 70, 71 and 74, 75 for ball direction conversion of the side lid 34.

Next, the ball 8 is attached to the other side cover 35 with a retainer.
7, 87... are filled, when inserting into the bearing block main body 10, the upper end 45 of the receiving member 48, 49, which has a substantially U-shaped cross section, is inserted into the no-load ball groove 30,
It fits into the grooves 41 and 42 on the 31 side.

Next, the U-shaped notches 95 of the horizontal members 36, 37 are inserted into the screws 39 temporarily fixed to the top wall 17 of the block body 10, and the locking pins 89, 91, 91, 93, 93 at the tips of the retainers are inserted. are sequentially fitted into the locking pin holes 90, 92, 92, 94, and 94 of the retainer that have already been inserted into the bearing block main body 10.

Next, bolts 99 are inserted into the mounting holes 96, 96, 96 of the side covers 34, 35 with retainers, respectively, and screwed onto the bearing block body 10.

Since the linear ball bearing unit of the present invention is constructed as described above, the load balls running between the load ball grooves of the bearing block body 10 and the track base 86 are connected to the U-shaped grooves 70 and 7 for changing the ball direction.
1, 74, 75 into the no-load ball hole 28, and then the no-load ball groove 30 of the hook-shaped receiving parts 22, 23 of the bearing block body 10.
31 and the guide grooves 5 of the left and right receiving members 48, 49
Sent between 1.51.

The guide grooves 51, 51 are formed on the inner surfaces of the receiving members 48, 49, each having a substantially U-shaped cross section, and are formed symmetrically with the no-load ball grooves 30, 31 of the receiving portions 22, 23, so that no-load The ball can travel smoothly.

Moreover, the U-shaped cross-sectional receiving member is made of thermosetting resin.
Since the side cover with retainer is integrally molded using materials such as die-cast alloy and sintered alloy, side plates and multiple female screws and screws are no longer required, resulting in lighter linear ball bearings and improved assembly work efficiency. In addition, since the upper end of the inverted L-shaped portion is fitted into the concave groove of the bearing block body, the distortion of the thermosetting resin is corrected and the rigidity is further increased. Furthermore, the dust-proofing effect of the linear ball bearing is extremely good.

As one embodiment of the present invention, it is illustrated and explained that the upper end of the inverted L-shaped part is fitted into the groove of the bearing block body. For example, they may be fixed together with an adhesive or with a slight gap between them. In other words, a U-shaped receiving member can be used to connect the bearing block to the hook-like shape of the bearing block body. It is sufficient if it is configured to surround the receiving part.

Further, by tightening a plurality of fastening members such as bolts or nuts arranged on the side wall of the bearing block body 10, a preload is applied through the slit, and the gap between the load ball and the load ball groove can be adjusted. It can be provided as a high-precision linear ball bearing unit, and has the feature that there is no differential sliding of the balls even when preload is applied, allowing for light rolling motion.

Since the balls are held by the side cover with a retainer so that they can be aligned and circulated, there is an effect that the balls will not fall off even if the bearing block body is removed from the track.

It is economical to form the left and right sides of the side lid with the retainer in the same manner, but even if they are not necessarily the same, there is no difference in operation and effect.

In other words, it is sufficient to make one retainer long and the other retainer shortened by the longer length.Also, a locking pin and a hole for the locking pin are formed at the tip of the retainer, but the left and right retainers are This means is convenient for integrating the vessels because it is removable.

However, if fitting and removing is not necessary, it is also possible to bond both end faces with a strong adhesive and further adhesively fix the horizontal member to the top wall of the bearing block body. In any case, it does not interfere with the circulating movement of the load ball.

[Brief explanation of drawings]

Figure 1 is a partially omitted assembled front view of the linear ball bearing unit of the present invention, Figure 2 is a partially sectional assembled side view of the linear ball bearing of the present invention, and Figure 3 is the main bearing block body of the linear ball bearing of the present invention. 4 is a plan view of the material shown in FIG. 3, FIG. 5 is a front view of the main bearing block body of the linear ball bearing of the present invention,
Fig. 6 is a side view of Fig. 5, Fig. 7 is an enlarged front view of the main part of Fig. 5, Fig. 8 is a front view of the main part of the linear ball bearing of the present invention, and a side cover with a retainer. 8th
10 is a sectional view taken along line A-A in FIG. 8, FIG. 11 is a plan view of FIG. 8,
Fig. 12 is a sectional view taken along the line B-B in Fig. 8, Fig. 13 is a cross-sectional view of the way to which the linear ball bearing unit of the present invention is incorporated, and Fig. 14 is a cross-sectional view of the way from which the linear ball bearing unit of the present invention is removed. It is an exploded perspective view after taking it. 11...Material of the bearing block body, 12
...Trapezoidal depression, 13,14...Skirt, 1
5, 16...Bulging part, 17...Top wall, 18, 19
... Inclined wall, 24, 25 ... Load ball groove, 2
8, 29...No-load ball hole, 30, 31...No-load ball groove, 34, 35...Side cover with retainer, 5
1... Guide grooves, 70, 71 and 74, 75...
...U-shaped groove for changing ball direction.

Claims (1)

[Claims for Utility Model Registration] (1) The material of the bearing block main body 10 having a depression 12 with a substantially trapezoidal cross section in the center and skirts on the left and right sides of the depression 12 is molded, and the trapezoidal depression 12
Load ball grooves 24, 25, 2 having approximately the same radius of curvature as the ball are in the top wall 17 and lower hook-shaped receiving parts 22, 23 of the inclined walls 18, 19.
6 and 27 are formed in the axial direction, and non-load ball holes 28 and 29 are formed in parallel to the load ball grooves 24 and 25 of the top wall 17, penetrating in the axial direction, and at the bottom of the inclined wall. Load ball grooves 2 are provided on the outer periphery of the hook-shaped receiving parts 22 and 23 on the back side.
No-load ball grooves 30, 31 parallel to 6, 27
A bearing block body 10 formed of
In the linear ball bearing in which side covers 34 and 35 with retainers are attached to both end faces of the bearing block body 10, the side covers 34 and 35 with retainers have U-shaped grooves 70 for changing ball direction,
71 indicates the load ball grooves 24, 25 and the non-load ball holes 28, 2 of the bearing block body 10.
9 and load ball grooves 26, 27 and guide groove 5
The horizontal members 36, 36 are formed at locations corresponding to
37. The left and right inclined members 80, 81 and the left and right receiving members 48, 49 are integrally formed to protrude, and at the same time, a loaded ball groove is formed in the axial direction between these members, which is substantially equal to the ball and prevents the ball from falling out. cage, and the side lid with cage 34, 3
5 is inserted from both sides of the bearing block main body 10, and the horizontal members 36 and 37 are fixed to the top wall of the bearing block main body 10,
Furthermore, the left and right receiving members 48 and 49 are formed into a substantially U-shaped cross section, and the receiving members 4
The upper ends 45 of the inverted L-shaped portions 46 and 47 of 8 and 49 are provided opposite to the no-load ball grooves 30 and 31 side of the bearing block body 10, and the receiving member 4
A guide groove 51 is formed in the inverted L-shaped portions 46 and 47 of 8 and 49, and a large number of balls 87 are connected to the bearing block body 10 and the side cover with retainer 34,
35, and a load ball groove having approximately the same radius of curvature as the ball 87 corresponding to the load ball grooves 24 to 27 of the bearing block main body 10 is provided on the left and right protrusions. A linear ball bearing unit in which track stands 86 having a substantially X-shaped cross section are formed on the upper wall surface 102 and the lower inclined surfaces 105 and 106 of 100 to 101, respectively. (2) The upper end 45 of the inverted L-shaped portions 46, 47 is the left and right receiving members 48, 49 fitted into the grooves 41, 42 of the bearing block body 10, as claimed in claim 1 of the utility model registration claim. Linear ball bearing unit.