JP2003120680A - Split type retainer for ball-and-roller bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve retaining force in a joint portion of split pieces, to prevent generation of a strange noise, and to realize a reduced noise. SOLUTION: A retainer split pieces 1 comprises: band like split piece bodies 2 for holding rolling members; and a protruding first joint portion 3 placed longitudinally at on one end 2a of the split piece body 2; and a recessed second joint portion 4 placed longitudinally at the other end 2b thereof. The first joint portion 3 is provided with a retaining portion 9 having a width larger than an end base portion 8, at a leading end of the end base portion 8 which is formed outwardly to protrude outside from the longitudinal one end 2a of the split body 2. The second joint portion 4 is formed to be a recessed portion having the same shape as the first joint portion 3. A plurality of the retainer split pieces 1 are jointed by engagement of the protruding portions with the recessed portions to form the ball-and-roller bearing in the annular shape. The first joint portion 3 is formed such that an angle formed by the retaining rear end portion 9d with an end portion 8a in a width direction of the end base portion 8 is acute one.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a split type cage for rolling bearings.

[0002]

2. Description of the Related Art Since a bearing for supporting a CT scanner rotating drum is large, a retainer for holding a ball is a split type retainer in which a plurality of divided pieces are connected to each other and assembled into an annular shape. It is used. A conventional split type cage is disclosed in, for example, Japanese Patent Laid-Open No. 9-88896.

FIG. 4 shows a conventional connecting structure based on the cage disclosed in Japanese Patent Laid-Open No. 9-88968. In the conventional connecting structure, the convex first connecting portion 31 provided on one of the split pieces 30 and the concave second connecting portion 33 provided on the other split piece 30 are fitted into each other to form two protrusions. Split piece 30,
30 are connected to each other.

The first connecting portion 31 has a round tip, and the second connecting portion 33 also has a round recess corresponding to this. Further, conventionally, the first connecting portion 31 and the second connecting portion 33
When the and are connected, of the facing surfaces of the adjacent divided pieces 30 and 30, in the portion indicated by the thick line in the circular partial view 4 in FIG. The size of the second connecting portion is set. Due to the presence of the slight gap, the first connecting portion 31 and the second connecting portion 33
It is easy to fit and.

[0005]

The balls held by the cage may lead or lag, but in the case of the split type cage, when the balls lead or lag, the connecting portion of the split pieces is fitted. May come off or get stuck. This is because the tip of the first connecting portion has a round shape, so that when a force acts in a direction in which the divided pieces are separated from each other, the second connecting portion 33 is easily deformed and the connecting portion withdrawing force is small. If the connecting portions 31 and 33 come off or get stuck during rotation, abnormal noise may occur.

Further, in the conventional cage, since there is a slight gap between the facing surfaces of the adjacent divided pieces 30 and 30, this gap causes play, and when a plurality of divided pieces are connected to form an annular shape, The shape becomes a petal shape as shown in FIG. For this reason, under high speed rotation, the cage comes into strong contact with the guide surface, which causes abnormal noise. Moreover, when the cage has a petal shape, the cage comes into strong contact with the inner ring and the outer ring on the guide surface, and abrasion powder of the cage is generated to promote deterioration of grease.

In view of the above-mentioned conventional problems, it is an object of the present invention to increase the pulling force at the connecting portion of the divided pieces. Another object of the present invention is to prevent generation of abnormal noise and reduce noise.

[0008]

The present invention employs the following technical means for achieving the above object. That is, according to the present invention, a strip-shaped divided piece main body for holding a rolling member, and a convex first portion provided at one end of the divided piece main body in the longitudinal direction of the strip.
It has a retainer division piece provided with a connecting portion and a concave second connection portion provided at the other end of the division piece body in the longitudinal direction of the division piece, and the first connection portion has a longitudinal direction of the division piece body. One end of the base end portion that is formed to project outward from one end in the direction is provided with a retaining portion that is wider than the base end portion, and the second connecting portion can have the first connecting portion recessed and fitted. So that the first
In a split type cage for a rolling bearing, which is formed as a recess having the same shape as the connecting portion, and in which a plurality of the cage divided pieces are connected to each other by concavo-convex fitting of the first connecting portion and the second connecting portion to form an annular shape. The first connecting portion is formed such that the angle of the rear end portion of the retaining portion with respect to the widthwise end portion of the base end portion is an acute angle.

The first connecting portion is formed such that the angle of the rear end portion of the retaining portion with respect to the widthwise end portion of the base end portion is an acute angle, and the second connecting portion engages with the first connecting portion in a concavo-convex manner. Since the concave portions have the same shape, even if the first connecting portion is to be pulled out from the second connecting portion, the retaining end of the retaining portion is strongly caught by the second connecting portion, and the first connecting portion is likely to come off. The force acting as follows works in the direction in which the second connecting portion holds the first connecting portion more strongly. Therefore, the pulling force at the connecting portion of the divided pieces is increased.

When the first connecting portion and the second connecting portion are fitted to each other, a gap is formed in at least a part between the facing surfaces of the adjacent divided pieces, and a gap is present. It is preferable that the shapes of the first connecting portion and the second connecting portion are set so that there is no gap in a portion that causes play between the facing surfaces.

By forming a gap in at least a part between the facing surfaces, concave-convex fitting is facilitated, the split type cage is easily assembled, and if there is a gap, backlash is generated between the facing surfaces. Since there is no gap in the part, it is possible to avoid the occurrence of backlash while facilitating the assembly. Since the backlash can be avoided, it is possible to prevent the retainer from having a petal shape as in the conventional case, and it is possible to reduce the occurrence of abnormal noise.

Furthermore, a shoulder surface inclined so that the width of the retaining portion is tapered is provided at a side end side of the retaining portion of the first connecting portion, and the first connecting portion and the second connecting portion are provided. A first connecting portion and a second connecting portion are formed so that when the connecting portion is fitted, a gap is formed between the shoulder surface and the second connecting portion and no gap is formed between the other facing surfaces. The shape is preferably set.

By forming the gap on the shoulder surface, it is possible to prevent looseness of the split type cage even if the gap for facilitating the fitting is secured.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a cage split piece 1 which constitutes a split type cage for a rolling bearing according to the present invention. The cage divided piece 1 is one piece obtained by dividing an annular cage into 12 pieces, and is entirely made of plastic. The cage split piece 1 is provided on the strip-shaped split piece body 2, the first connecting portion 3 provided on one end of the split piece body 2 in the strip longitudinal direction, and on the other end of the split piece body 2 in the strip longitudinal direction. The second connecting portion 4 is provided.

The divided piece body 2 is provided with a plurality of pockets 6 at predetermined intervals in the longitudinal direction. The pocket 6 is
It is formed as a hole penetrating in the thickness direction of the divided piece body 2 for holding a rolling member such as a ball or a cylinder. The first connecting portion 3 is a convex portion that is formed so as to extend outward in the longitudinal direction from one end 2a in the longitudinal direction of the strip of the split piece body 2, and the second connecting portion 4 is the strip of the main body of the split piece 2. It is a concave portion that is recessed inward in the longitudinal direction from the other end 2b in the longitudinal direction.

The first connecting portion 3 and the second connecting portion 4 are formed so that they can be fitted in a concavo-convex manner. As shown in FIGS. 2 and 3, the first connecting portion 3 of one divided piece 1a and other Second of the divided pieces 1b
Two pieces 1a and 1b are formed by fitting the connecting piece 4 together.
Can be connected, and similarly, by connecting 12 divided pieces, an annular cage can be assembled.

The first connecting portion 3 has a base end portion 8 projecting outward from one end 2a of the divided piece body 2 in the longitudinal direction of the strip.
A retaining portion 9 formed on the tip side of the base end portion 8 is provided. The retaining portion 9 is wider than the base end portion 8 and has a generally arrowhead shape. Specifically, it has side surfaces 9a, 9a parallel to each other on both sides in the width direction, and shoulder surfaces 9b, 9b inclined from the tip side of these side surfaces 9a, 9a so as to taper in width. There is. Further, a tip end surface 9c parallel to the width direction is formed on the tip end side of the retaining portion 9, and a rear end side thereof extends from the tip end side of the base end portion 8 to the side surface 9 thereof.
rear end face (rear end) 9 extending to both sides in the width direction up to a and 9a
d and 9d are formed.

The second connecting portion 4 is formed as a recess having a shape corresponding to the shape of the first connecting portion 3 so that the first connecting portion 3 can be fitted therein. Since the second connecting portion 4 is formed on the other end 2b in the longitudinal direction of the divided piece body 2, the other end 2b in the longitudinal direction of the divided piece body 2 is bifurcated.

Specifically, when the first connecting portion 3 is fitted, the second connecting portion 4 opposes the side faces (widthwise end portions) 8a, 8a on both sides of the base end portion in the width direction of the first connecting portion 3. First facing surface 11
a, 11a, the second facing surfaces 12a, 12a facing the side surfaces 9a, 9a of the retaining portion 9, and the shoulder surface 9 of the retaining portion 9.
b, 9b facing the third facing surfaces 12b, 12b, and the fourth facing surface 12c facing the tip surface 9c of the retaining portion 9,
The retaining portions 9 have fifth facing surfaces 12d and 12d that face the rear end surfaces 9d and 9d.

As shown in FIG. 3, the rear end surfaces 9d and 9d of the retaining portion 9 extend in the width direction so as to widen from the tip of the base end portion 8. Instead of extending in parallel to the direction w, it extends in the width direction while inclining at an angle β with respect to the width direction w so as to face the divided piece body 2 side. Therefore, the base end side surface (width direction end)
8a, the rear end surface (rear end) 9d of the retaining portion for the 8a,
The angle α of 9d is an acute angle. Also, the rear end surface 9d,
Fifth facing surfaces 12d, 12 of the second connecting portion 4 facing 9d
Similarly, d is inclined. Therefore, the other end 2b in the longitudinal direction of the divided piece body 2 has a hook-shaped engaging structure.
The angle α is 70 ° and the angle β is 20 °.

When a force to disengage the connecting portions 3 and 4 is exerted, the force is exerted in a direction to bring the first facing surfaces 11a and 11a of the second connecting portion 4 close to each other as indicated by an arrow x. It works, and the first facing surfaces 11a and 11a of the second connecting portion 4 function as a holding portion that holds the first connecting portion. Therefore, even if the first connecting portion 3 tries to come off, it is difficult to come off and the pulling force in the split piece connecting structure is improved.

When the removal force was measured at the conventional round connecting portion shown in FIG. 4 and it was about 115 N, the removal force at the arrowhead connecting portions 3 and 4 of this embodiment was about 680 N, which was the conventional one. The pulling force is improved about 6 times compared to.

When the first connecting portion 3 and the second connecting portion 4 are fitted together, there is a slight gap between the shoulder surface 9b of the first connecting portion 3 and the third facing surface 12b of the second connecting portion 4. Gaps are formed.
In FIG. 3, the gap is represented by a thick line. This gap is set to about 0.2 mm, and this gap facilitates fitting the first connecting portion 3 and the second connecting portion 4 together.

On the other hand, of the facing surfaces of the two divided pieces 1a, 1b, the facing surfaces 2a, 8a, 9a, 9c, 9d other than the shoulder surface 9b and the third facing surface 12b; 2b, 11a, 12
The first connecting portion 3 and the second connecting portion 4 are provided at a, 12c, and 12d.
The shapes of the first connecting portion 3 and the second connecting portion are set so that a gap does not occur when the and are fitted. For example, the width of the base end portion 8 and the distance between the first facing surfaces 11a and 11a are set to be the same.

In order to prevent looseness in the longitudinal direction of the strip of the annular retainer between the split pieces 1a and 1b, (1) one end face 2 in the longitudinal direction of the split piece body 2 is formed.
a and the other end surface 2b in the longitudinal direction, (2) the tip surface 9c of the retaining portion 9 and the fourth opposing surface 12c, and (3) the rear end surface 9d and the fifth opposing surface 12d of the retaining portion 9. It is only necessary that there are no gaps between the facing surfaces in at least two locations among the three facing locations. In the present embodiment, the gaps are eliminated between all the three facing surfaces.

In order to prevent rattling in the band width direction of the split pieces of the annular cage between the split pieces 1a and 1b, (4) the side surfaces 8a and 8a of the base end portion 8 are Between the first facing surface 11a and (5) the side surface 9 of the retaining portion 9
a, 9a and the second opposing surface 12a, of the two places,
It suffices that there is no gap between the facing surfaces at least at one place, and in the present embodiment, the gap is eliminated between all the facing faces at two places.

In particular, in the present embodiment, (1) between the longitudinal one end surface 2a and the longitudinal other end surface 2b of the divided piece body 2, which is a hook-shaped portion, (3) after the retaining portion 9 A gap is eliminated at three locations between the end surface 9d and the fifth opposing surface 12d and between (4) the side surfaces 8a, 8a of the base end portion 8 and the first opposing surface 11a to prevent backlash.

When the cage assembled with the divided pieces 1 as described above was rotated at 120 r / min and a specified load was applied to the test, no abnormal noise was observed. Therefore, it was confirmed that the connecting structure of the first connecting portion 3 and the second connecting portion 4 is very effective in the cage.

The present invention is not limited to the above embodiment. For example, the shape of the retaining portion 9 is not limited to the arrowhead shape, and the shape from the side surface 9a to the tip surface 9c may be a curved surface or an arbitrary polygonal surface. Further, the position where the gap between the facing surfaces is provided can be appropriately changed according to the change of the shape of the retaining portion.

[0030]

According to the present invention, the first connecting portion is formed such that the angle of the rear end portion of the retaining portion with respect to the widthwise end portion of the base end portion is an acute angle, and the second connecting portion has the second connecting portion. Since the concave portion has the same shape so that the first connecting portion and the first connecting portion are fitted to each other in a concavo-convex manner, even if the first connecting portion tries to come out from the second connecting portion, the rear end of the retaining portion and the second connecting portion are strongly caught, Moreover, the force with which the first connecting portion tends to come off acts in the direction in which the second connecting portion holds the first connecting portion more strongly. Therefore, the pulling force at the connecting portion of the divided pieces is increased.

Further, by forming a gap in at least a part between the facing surfaces of the adjacent split pieces, fitting is facilitated, the split type cage is easily assembled, and when a gap is present, the facing surface is provided. Since there is no gap in the portion that causes rattling, rattling can be avoided while facilitating assembly, and noise generation can be reduced.

[Brief description of drawings]

FIG. 1 is a plan view of a split piece that constitutes a split-type cage.

FIG. 2 is a partial plan view showing a first connecting portion and a second connecting portion before fitting.

FIG. 3 is a partial plan view showing a fitted first connecting portion and a second connecting portion.

FIG. 4 is a partial plan view showing a conventional connection structure diagram.

FIG. 5 is a conceptual diagram showing a conventional petal-shaped cage.

[Explanation of symbols]

1 cage split pieces 2 pieces 3 First connection 4 Second connection part 8 base end 9 retaining part 9b Shoulder

Claims (3)

[Claims] 1. A strip-shaped divided piece body for holding a rolling member, a convex first connecting portion provided at one end in the strip longitudinal direction of the divided piece body, and a strip longitudinal direction of the divided piece body. A retainer divided piece having a concave second connecting portion provided at the other end is provided, and the first connecting portion is a base end projecting outward from one end of the divided piece main body in the band longitudinal direction. The distal end of the portion is provided with a retaining portion that is wider than the base end portion, and the second connecting portion is a recess having the same shape as that of the first connecting portion so that the first connecting portion can be fitted into the recess and protrusion. A plurality of the cage divided pieces are connected by the concave-convex fitting of the first connecting portion and the second connecting portion to form an annular shape, the split type cage for rolling bearings, wherein the first connecting portion is formed. Is shaped so that the angle of the rear end of the retaining portion with respect to the widthwise end of the base end is an acute angle. Split cage for rolling bearings characterized by being made. 2. When the first connecting portion and the second connecting portion are fitted to each other, a gap is formed in at least a part between the facing surfaces of the adjacent divided pieces, and the gap is formed. 2. The split type for rolling bearing according to claim 1, wherein the shapes of the first connecting portion and the second connecting portion are set so that there is no gap in a portion that causes play between the facing surfaces when present. Cage. 3. A shoulder surface, which is inclined so that the width of the retaining portion is tapered, is provided at a side end side of the retaining portion of the first connecting portion, and the first connecting portion and the second connecting portion are inclined. When the connecting portion and the second connecting portion are fitted together, a gap is formed between the shoulder surface and the second connecting portion, and no gap is formed between the other facing surfaces.
The split type cage for rolling bearings according to claim 2, wherein the shape of the connecting portion is set.