JP4577125B2 - Rolling bearing - Google Patents

Description

  The present invention relates to a rolling bearing.

  Conventionally, as a rolling bearing cage, there is a ball bearing cage described in Japanese Patent Publication No. 05-022086. This ball bearing retainer is disposed over the entire circumference in the circumferential direction between the inner circumferential surface of the outer ring and the outer circumferential surface of the inner ring. This ball bearing retainer includes a plurality of arc-shaped segments made of synthetic resin extending in the circumferential direction. The balls are arranged at predetermined intervals in the circumferential direction by accommodating the balls in pockets formed one by one in each segment. In addition, by providing a gap between two segments adjacent in the circumferential direction, it is possible to absorb the expansion and contraction of the segment due to the temperature, and the cage is prevented from being deformed in the radial direction. Rotational torque is reduced.

However, in the conventional ball bearing retainer, since a gap is formed between two segments adjacent in the circumferential direction, the circumferential end portion of the segment is radial due to centrifugal force or a delay in the advance of the ball. When the segment comes into contact with the inner and outer rings due to this vibration, abnormal noise is generated from this contact portion, the ball bearing vibrates, or the wear powder of the cage generated by contact at the contact portion causes the ball and outer ring to There is a problem that the rolling part with the inner peripheral surface, the rolling part with the ball and the outer peripheral surface of the inner ring, or the sliding part with the ball and the cage enters the rotation part, causing a rotation failure such as an increase in torque, generation of vibration, and inability to rotate.
Japanese Patent Publication No. 05-022086

  Then, the subject of this invention is providing the rolling bearing which has the cage for rolling bearings which can absorb the expansion-contraction of the circumferential direction resulting from temperature, and can suppress radial runout.

In order to solve the above problems, the rolling bearing of the present invention is
Inner ring,
Outer ring,
A rolling element disposed between the inner ring and the outer ring;
A rolling bearing retainer for holding the rolling element,
The rolling bearing cage is
At least one arcuate or substantially ring-shaped end body having a pocket for accommodating the rolling element;
While slidably fitted into two fitting Goana provided on opposite sides in the circumferential direction of the body of the perforated end disposed annular, be linked separably the surface facing the circumferential direction and two bar-shaped member that,
One of the upper Symbol two bars shaped member, while you slide retractably one above SL two fitting Goana with the circumferential direction of the expansion and contraction of the body due to temperature variations, the other of the two rod-like members Is characterized in that the other of the two fitting holes slides forward and backward in accordance with the expansion and contraction of the body in the circumferential direction caused by temperature fluctuations .

  According to the present invention, since the rod-like member that connects the opposed surfaces so as to be able to contact and separate in the circumferential direction is provided, the radial deflection of the end portion including the opposed surfaces in the main body is limited, and centrifugal force and This end portion does not swing in the radial direction due to the advance and delay of the rolling elements. Therefore, the end portion can be prevented from coming into contact with the bearing ring (inner ring or outer ring) of the rolling bearing having the rolling bearing retainer. Therefore, the rolling bearing vibrates or the rolling bearing is caused by the contact. Therefore, it is possible to prevent the generation of abnormal noise and the generation of wear powder.

  In addition, according to the present invention, the rod-like member can slide with respect to the fitting hole, and the opposing surfaces can be contacted and separated in the circumferential direction. Expansion and contraction in the circumferential direction of the main body can be absorbed by variation in the size of the fitting portion of the rod-shaped member fitted in the fitting hole. Therefore, for example, when the temperature is in the vicinity of the upper limit of the assumed temperature range of use, the cage can be prevented from being deformed into an irregular shape, and the rotational torque of the rolling bearing having the cage can be suppressed. Can be prevented from increasing.

Moreover, the rolling bearing of one embodiment is
There are a plurality of the main bodies,
The rod-like member connects the opposing surfaces so as to be able to contact and separate.

  According to the above embodiment, since there are a plurality of the main bodies, and the circumferentially opposed surfaces are connected by the rod-like member so as to be able to come into contact with and separate from each other, the large expansion and contraction can be achieved even when the main body is greatly expanded and contracted. Can be absorbed reliably. In addition, since there are a plurality of the main bodies and the surfaces facing each other are connected to be separable by the rod-shaped member, the expansion and contraction can be absorbed evenly and uniformly in the entire cage, It is possible to suppress local deformation from occurring.

Further, according to the present invention, vibration and abnormal noise during operation can be suppressed, and rotational torque can be reduced.
Moreover, the rolling bearing of one embodiment is
One and the other of each of the upper Symbol opposing surfaces has two fitting holes,
One of the two rod-shaped members slides in one of the two fitting holes on one of the opposed surfaces so as to freely advance and retract, and two fittings on the other of the opposed surfaces. Slides forward and backward in one of the holes,
The other of the two bar-shaped members slides freely in the other of the two fitting holes on one of the opposing surfaces, and two fittings on the other of the opposing surfaces. freely slide retreat proceeds the other Goana.
Moreover, the rolling bearing of one embodiment is
One of the upper Symbol two bars shaped member is fixed to one or the other surface of said facing surfaces, while sliding retractably one of the two fitting holes, the two the other rod-like member is fixed to one or the other surface of said facing surfaces, to slide freely retreat proceeds the other of the two fitting holes.

  According to the rolling bearing of the present invention, since it includes the rod-shaped member that connects the circumferentially opposed surfaces of the end body disposed in a ring shape so as to be able to contact and separate in the circumferential direction, the end portion including the opposed surfaces. Therefore, it is possible to prevent the end portion from coming into contact with the bearing ring of the rolling bearing having the rolling bearing retainer. Therefore, it is possible to prevent the rolling bearing from vibrating due to the contact, the generation of noise from the rolling bearing, and the generation of wear powder.

  Further, according to the rolling bearing of the present invention, the dimension of the fitting portion of the rod-shaped member fitted in the fitting hole varies due to the sliding of the rod-shaped member with respect to the fitting hole. Therefore, it is possible to absorb the expansion and contraction in the circumferential direction of the main body due to the temperature change, and to suppress the cage from being deformed into an irregular shape due to the temperature fluctuation, and the rolling bearing having this cage An increase in the rotational torque can be suppressed.

  Hereinafter, the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a sectional view in the axial direction of a ball bearing which is an embodiment of the rolling bearing of the present invention.

  The ball bearing includes an outer ring 1, an inner ring 2, a ball 3 as an example of a rolling element, and a ball bearing cage (hereinafter referred to as a cage) 4 as a rolling bearing cage. The outer peripheral surface of the outer ring 1 is fitted and fixed to a housing (not shown) of the swivel seat of the CT scanner, and the inner peripheral surface of the inner ring 2 is fixed to a rotating shaft (not shown). Track grooves are formed on the inner peripheral surface of the outer ring 1 and the outer peripheral surface of the inner ring 2. The cage 4 is disposed between the inner peripheral surface of the outer ring and the outer peripheral surface of the inner ring, and has a pocket 6 for accommodating the ball 3. A plurality of the balls 3 are arranged between the raceway grooves of the outer ring 1 and the raceway grooves of the inner ring 2 in a state of being accommodated in the pockets 6 of the cage 4 with a certain interval in the circumferential direction.

  FIG. 2 is a schematic front view of a part of the ball bearing of the embodiment.

  The cage 4 includes a plurality of synthetic resin-made main bodies 11 and steel pins 12 as an example of a plurality of rod-shaped members. As shown in FIG. 2, the main body 11 has an arc shape and has ends on both sides in the circumferential direction. Although not shown, the main bodies 11 are arranged at substantially equal intervals in the circumferential direction. The intervals in the circumferential direction between two main bodies 11 adjacent to each other in the circumferential direction are substantially the same. For example, when there are six main bodies 11, all six circumferential intervals between the circumferential directions of two main bodies 11 adjacent in the circumferential direction are substantially the same. The pin 12 extends in the circumferential direction. As shown in FIG. 2, the pin 12 connects two main bodies 11 adjacent in the circumferential direction.

  FIG. 3 is a perspective view showing the circumferential end of the main body 11 and the pin 12 adjacent to each other in the circumferential direction.

  As shown in FIG. 3, the main body 11 is made of a curved synthetic resin plate. A pocket (indicated by 6 in FIG. 1) that penetrates in the thickness direction of the main body 11 and accommodates a ball is formed in the approximate center (circumferential direction and width direction) of each main body 11. The main body 11 has end faces 13 that extend in a substantially radial direction at both ends in the circumferential direction. The end surface 13 on one side in the circumferential direction of each main body 11 and the end surface 13 of the main body 11 adjacent to each main body 11 facing the end surface 13 in the circumferential direction constitute a surface facing in the circumferential direction. . In this embodiment, the end surface 13 on one side in the circumferential direction of each main body 11 and the end surface 13 of the main body 11 adjacent to the main body 11 facing the end surface 13 in the circumferential direction form a pair. The shapes and sizes of the two end faces 13 facing each other in the circumferential direction are substantially equal. The periphery of the end face 13 is composed of two arcs having substantially the same center of curvature and facing in the radial direction, and two straight lines facing in a substantially parallel state.

  As shown in FIG. 3, the main body 11 has a fitting hole 21 extending substantially in the circumferential direction. Two fitting holes 21 are formed at each end of the body 11 in the circumferential direction, and four are formed in each body 11. The fitting hole 21 opens in the end face 13. There are two openings on each end face 13. As shown in FIG. 3, the opening is present at substantially the center of each part of the end face 13 that is separated into two parts when it is assumed that the main body 11 is divided into two equal parts in the width direction. In other words, the openings are present in a pair at opposite positions in the circumferential direction of the pair of end faces 13 that are substantially opposed to each other, and two pairs of openings are present in the pair of end faces 13.

  The pin 12 extends along the circumferential direction. As described above, there are two pairs of openings in the pair of end faces 13, and two pins 12 are used to connect the pair of end faces 13. Further, in each pin 12, one end portion in the circumferential direction of the pin 12 is slidably fitted in the fitting hole 21, and one end portion is fitted in the other end portion in the circumferential direction of the pin 12. The fitting hole 21 is slidably fitted in the fitting hole 21 that faces the fitting hole 21 in the circumferential direction. As a result, the two end faces 13 opposed in the circumferential direction can be contacted and separated in the circumferential direction. Thus, the circumferential direction of the main body 11 due to the temperature is obtained by adopting a structure in which the size of the fitting portion of the pin 12 with the fitting hole 21 varies according to the expansion and contraction of the main body 11 due to the temperature. Thus, the cage 4 is prevented from being deformed into an irregular shape due to temperature fluctuations, thereby reducing the rotational torque of the ball bearing. Further, the pin 12 also plays a role of suppressing the circumferential end of each main body 11 from swinging in the radial direction. In other words, the pin 12 constrains the circumferential end of each main body 11 in the radial direction.

  4 and 5 are schematic cross-sectional views showing a part of the center surface of the main body 11 in the thickness direction. Below, the absorption method of the expansion-contraction of the main body 11 in the said holder | retainer is demonstrated using FIG. 4 and FIG. Here, the temperature in the state shown in FIG. 5 is higher than the temperature in the state shown in FIG. Specifically, FIG. 5 shows a state at a temperature at the upper limit of the temperature range of the assumed use state.

  As shown in FIGS. 4 and 5, when the temperature increases and the main body 11 expands due to the increase in temperature and the circumferential interval between the adjacent main bodies 11 decreases, the main body 11 is fitted into the fitting hole. The pin 12 slides in a direction where the depth of the fitting hole 21 is deeper in a direction in which the fitting portion of the mated pin 12 becomes larger. That is, the pin 12 slides in the fitting hole 21 so as to freely advance and retract. In this way, the expansion and contraction in the circumferential direction of the main body 11 due to temperature fluctuations is absorbed. In addition, when the temperature is lower than the upper limit temperature of the assumed temperature range of the use state, a gap is generated between the end surface on at least one side of the pin 12 and the bottom surface of the fitting hole 21. Thus, the cage 4 is deformed irregularly at a temperature in the vicinity of the upper limit temperature range of the assumed use state (so that the overall shape of the cage 4 is not ring-shaped, that is, the roundness of the overall shape of the cage is Is deformed so as to be worse.

  According to the cage 4, since the pin 12 that connects the opposing end surfaces 13 so as to be able to contact and separate in the circumferential direction is provided, the radial deflection of the end portion including the opposing end surfaces 13 of the main body 11 is limited, and centrifugal This end portion does not swing in the radial direction due to the force or the advance and delay of the rolling elements. Therefore, the end can be prevented from coming into contact with the inner ring 2 or the outer ring 3, so that the ball bearing vibrates, an abnormal noise is generated from the ball bearing, or wear powder of the cage is generated due to the contact. Can be prevented.

  Moreover, according to the said retainer 4, since the pin 12 can slide with respect to the fitting hole 21, and the end surfaces 13 which oppose can be contacted / separated in the circumferential direction, the fitting hole 21 The expansion and contraction in the circumferential direction of the main body 11 due to the temperature change can be absorbed by the variation in the size of the fitting portion of the pin 12 with respect to the. Therefore, for example, when the temperature rises, the cage 4 can be prevented from being deformed into an irregular shape, and an increase in the rotational torque of the rolling bearing having the cage 4 can be suppressed.

  Further, according to the cage 4, there are a plurality of the main bodies 11, and the circumferentially opposed surfaces are connected to each other by the pins 12, so that even when the expansion and contraction of the main body 11 is large, Can absorb large expansion and contraction reliably. In addition, since there are a plurality of the main bodies 11 and the circumferentially opposed surfaces are connected to be separable by the rod-like member, the expansion and contraction can be absorbed evenly and uniformly in the entire retainer 4, It is possible to suppress local deformation of the cage 4.

  Moreover, according to the said retainer 4, since the end surface 13 which opposes the circumferential direction is connected with the pin 12 of two (in this embodiment, two), the edge part of the circumferential direction of the main body 11 is diameter. It can be restrained reliably in the direction.

  Moreover, according to the ball bearing of the said embodiment, since the said holder | retainer 4 is provided, while being able to suppress the vibration and noise during a driving | operation, rotational torque can be made small.

  In addition, although the said holder | retainer 4 hold | maintained the ball | bowl 4, in this invention, a holder | retainer may hold | maintain rolling elements other than balls, such as a tapered roller and a cylindrical roller. .

  Further, in the cage 4, the end faces 13 facing in the circumferential direction are connected by the two pins 12. However, in the present invention, the two end faces facing in the circumferential direction are connected by one or three or more connecting portions. May be.

  Moreover, although the said holder | retainer 4 had the some arc-shaped main body 11 in the front view, in this invention, a holder | retainer may have only one substantially ring-shaped main body in a front view. That is, you may have only one main body of the shape (one interval of the circumferential direction) which cut | disconnected a part of the circumferential direction of the ring.

  The cage 4 has the pocket 6 surrounded by the resin material. However, in the present invention, the cage may have a so-called crown-type cage pocket.

  Moreover, in the said cage | basket 4, although the rod-shaped member was comprised with the steel pins 12, in this invention, you may comprise a rod-shaped member with rod-shaped members other than pins, such as a piano wire and a wire. In this invention, the rod-shaped member is a steel pin 12 and the rod-shaped member is made of metal. Any material may be used, for example, resin.

  In the cage 4, one pocket is formed in each main body 11. However, in the present invention, a plurality of pockets may be formed in each main body. In addition, when there are a plurality of main bodies, it is not necessary that the main bodies have the same shape. For example, there may be main bodies having different dimensions in the circumferential direction.

  Further, in the cage 4, the shape and size of the end surface 13 facing in the circumferential direction are the same, but in this invention, the cage is the shape and size of the two end surfaces facing in the circumferential direction. At least one of them may be different.

  Further, in the cage 4, the fitting holes 21 are provided on both of the end faces 13 facing in the circumferential direction. However, in the present invention, the fitting holes are provided only on one side of the end faces facing in the circumferential direction. There may be. That is, a structure in which one end of the rod-shaped member is fixed to an end including one of the opposing end surfaces (or one of the end surfaces and the rod-shaped member are integrated, and the rod-shaped member protrudes from one of the end surfaces. In addition, a structure in which the other end portion of the rod-like member is slidably fitted in a fitting hole formed in an end portion including the other of the opposing end surfaces may be employed. In addition, as the fixing method, an insertion hole that opens to one of the end faces is formed in an end including one of the end faces, and after inserting one end of the rod-shaped member into the insertion hole, the insertion hole and the rod-shaped member There is a method such as bonding between one end portion with an adhesive.

It is sectional drawing of the axial direction of the ball bearing which is one Embodiment of the rolling bearing of this invention. It is a model front view of a part of ball bearing of the above-mentioned embodiment. It is a perspective view which shows the edge part and connection part of the circumferential direction of two main bodies adjacent to the circumferential direction. It is a schematic cross section which shows a part of center plane of the thickness direction of a main body. It is a schematic cross section which shows a part of center plane of the thickness direction of a main body.

1 outer ring 2 inner ring 3 ball 4 cage 6 pocket 11 body 12 pin 13 end face 21 fitting hole

Claims (4)

Inner ring,
Outer ring,
A rolling element disposed between the inner ring and the outer ring;
A rolling bearing retainer for holding the rolling element,
The rolling bearing cage is
At least one arcuate or substantially ring-shaped end body having a pocket for accommodating the rolling element;
While slidably fitted into two fitting Goana provided on opposite sides in the circumferential direction of the body of the perforated end disposed annular, be linked separably the surface facing the circumferential direction and two bar-shaped member that,
One of the upper Symbol two bars shaped member, while you slide retractably one above SL two fitting Goana with the circumferential direction of the expansion and contraction of the body due to temperature variations, the other of the two rod-like members Is a rolling bearing characterized in that the other of the two fitting holes slides forward and backward as the body expands and contracts in the circumferential direction due to temperature fluctuations . The rolling bearing according to claim 1,
There are a plurality of the main bodies,
The rod-shaped member is a rolling bearing characterized in that the opposing surfaces are connected so as to be able to contact and separate. In the rolling bearing according to claim 1 or 2,
One and the other of each of the upper Symbol opposing surfaces has two fitting holes,
One of the two rod-shaped members slides in one of the two fitting holes on one of the opposed surfaces so as to freely advance and retract, and two fittings on the other of the opposed surfaces. Slides forward and backward in one of the holes,
The other of the two bar-shaped members slides freely in the other of the two fitting holes on one of the opposing surfaces, and two fittings on the other of the opposing surfaces. rolling bearing characterized by other in advance retreat freely sliding Goana. In the rolling bearing according to claim 1 or 2,
One of the upper Symbol two bars shaped member is fixed to one or the other surface of said facing surfaces, while sliding retractably one of the two fitting holes, the two the other rod-like member is a rolling bearing, characterized in that is fixed to one or the other surface of said facing surfaces, to slide freely retreat proceeds the other of the two fitting holes.

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