JP5216361B2 - Rolling bearing unit - Google Patents

Description

  The present invention relates to a rolling bearing unit.

Generally, a rolling bearing unit rotates a cylindrical inner cylinder which is an inner member, a cylindrical outer cylinder which is an outer member disposed around the inner cylinder, and the inner cylinder and the outer cylinder relatively. And a pair of ball bearings that are freely supported. And a pair of ball bearing is each comprised from the inner ring | wheel, the outer ring | wheel, and the some ball provided so that rolling between these inner ring | wheels and outer rings was possible.
In order to preload the ball bearing, such a rolling bearing unit uses two spacers in the axial direction using a single spacer, an outer cylinder and an integral spacer, or an outer ring and an integral spacer. Are arranged at predetermined intervals (for example, Patent Documents 1 to 3).

In Patent Document 1, the inner diameter of the outer cylinder is made a hole without a protrusion, and a ring-shaped spacer is inserted between the outer rings of the upper and lower ball bearings to maintain the interval between the ball bearings.
Moreover, in patent document 2, the cyclic | annular convex part which protruded radially inward was provided in the axial direction intermediate part of the internal peripheral surface of an outer cylinder, and the axial direction one end surface of each outer ring | wheel is provided in the both sides | surfaces of this cyclic | annular convex part. It comes to hit.
In Patent Document 3, the length of each inner ring in the two ball bearings in the axial direction is shorter than the length in the axial direction of each outer ring so that the two ball bearings are in contact with each other. A space is formed between the inner rings when packaged on a cylinder. In other words, a part of the outer ring also serves as a spacer.
JP 2002-257134 A Japanese Patent Laying-Open No. 2005-257028 Japanese Patent No. 3054858

  However, when the spacer is a single piece as in Patent Document 1, there are inconveniences that the spacer is easily displaced in the radial direction and that it is difficult to center the spacer, and that the number of parts increases and the cost increases. . In addition, as in Patent Document 2, when the spacer is integrated with the outer cylinder, there is a disadvantage that it is difficult to process the concentricity of the outer cylinder. Also, as in Patent Document 3, when the spacer is integrated with the outer ring, it is necessary to prepare many types of outer rings, which are high-precision parts, in order to correspond to the product assortment, which is costly. There is an inconvenience.

  The present invention has been made in view of the circumstances described above, and it is an object of the present invention to provide a rolling bearing unit that can prevent leakage of grease or the like and inflow of dust and can reduce costs. To do.

In order to achieve the above object, the present invention provides the following means.

The present invention includes an inner ring and an outer ring that are arranged coaxially, a plurality of rolling elements that are built in an annular space between the inner and outer rings at circumferential intervals, and at least an axial direction of the annular space. A shield member disposed at a position where one end is closed; and a fixing member that sandwiches and fixes the shield member between steps of the outer ring or the inner ring, and is disposed in contact with each other in the axial direction. Two rolling bearings and a shaft member fitted to the inner rings of these two rolling bearings, and at least one of the fixed members extends radially between the outer rings of the two rolling bearings , or the two providing a bearing unit overhang sandwiched in contact with the inner race each other of the rolling bearing is provided.

  According to the present invention, since the shield member is pressed by the ring member, a flat shield member that is inexpensive and versatile can be used. Further, since the projecting portion of the ring member also serves as a spacer for securing a predetermined interval between the rolling bearings, it is not necessary to use a special spacer, and the cost can be reduced.

The present invention includes an inner ring and an outer ring that are arranged coaxially, a plurality of rolling elements that are built in an annular space between the inner and outer rings at circumferential intervals, and at least an axial direction of the annular space. Two rolling bearings having a shield member arranged at a position where one end is closed, and arranged at a predetermined interval in the axial direction, and a shaft member fitted to the inner ring of these two rolling bearings, A ring-shaped spacer sandwiched between the outer rings of the two rolling bearings or between the inner rings, and a ring that sandwiches and fixes the shield between the step portions of the outer ring, and at least one of the rings, Provided is a bearing unit provided with a movement preventing portion having an L-shaped cross section for restricting the movement of the spacer in the radial direction.

According to the present invention, it is possible to prevent the spacer from being displaced in the radial direction by the ring movement preventing portion even in a state before the rolling bearing unit of the present invention is fitted to another member. In addition, it is possible to use a single spacer that is inexpensive and easy to process as compared with a spacer that is integrated with the outer ring, or a spacer that is integrated with another member that fits the outer ring, thereby reducing costs.

  According to the present invention, it is possible to prevent leakage of grease or the like and inflow of dust, and to achieve an effect that costs can be reduced.

[First Embodiment]
Hereinafter, a rolling bearing unit according to a first embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the rolling bearing unit 1 according to the present embodiment includes a first rolling bearing 10 </ b> A and a second rolling bearing 10 </ b> B (hereinafter referred to as a first rolling bearing) that are arranged in contact with each other in the axial direction. 10A and the second rolling bearing 10B are collectively referred to as “rolling bearings 10A and 10B”), and a shaft (shaft member) 3 fitted to the rolling bearings 10A and 10B is provided. Reference numeral 5 denotes a sleeve to which the rolling bearing unit 1 is fitted.

  The rolling bearings 10A and 10B are for rotating the shaft 3 and the sleeve 5 relatively. The first rolling bearing 10A is composed of a plurality of rolling elements that are arranged coaxially and arranged in an annular space between the inner ring 12a and the outer ring 14a, and between the inner ring 12a and the outer ring 14a in the circumferential direction. 16 and shields (shield members) 7 and 8 disposed at positions to close both ends of the annular space in the axial direction. Reference numeral 9 denotes a retainer that keeps the rolling elements 16 at a predetermined interval so as not to contact each other.

A deep groove type or angular type inner ring raceway is provided on the outer peripheral surface of the inner ring 12a, and a deep groove type or angular type outer ring raceway is provided on the inner peripheral surface of the outer ring 14a.
As shown in FIG. 2, stepped portions 11 that extend radially outward are provided at both axial ends of the inner peripheral surface of the outer ring 14 a. The cylindrical surface of the step portion 11 is an inclined surface that is inclined inwardly in the axial direction outward of the outer ring 14a.
In addition, the structure of the 2nd rolling bearing 10B is the same structure as 10A of 1st rolling bearings, and abbreviate | omits description.

  The shields 7 and 8 are, for example, metal or plastic annular plate-like members, and can be manufactured by press molding or resin molding. The shields 7 and 8 are disposed so as to abut against the step portion 11 of the outer ring 14a and block between the inner and outer rings. As shown in FIG. 2 and FIG. 3, a projecting portion 13 extending radially outward is circumferentially provided on the outer edge portion of the shield 8 disposed to face the second rolling bearing 10 </ b> B of the first rolling bearing 10 </ b> A. Five are provided at intervals. The overhanging portion 13 protrudes outward in the axial direction of the stepped portion 11 and comes into contact with the axial end surface of the outer ring 14a.

  The shaft 3 is a cylindrical member having a through hole 3 in the center, and is provided with a flange-shaped flange portion 15 protruding outward in the radial direction over the entire circumference at one end in the axial direction. The shaft 3 is fitted with a first rolling bearing 10A and a second rolling bearing 10B in order from the flange portion 15 side. The end surface of the inner ring 12a of the first rolling bearing 10A is abutted against the flange portion 15, and the second rolling bearing 10B is abutted against the first rolling bearing 10A.

  The first rolling bearing 10A and the second rolling bearing 10B are arranged in contact with the projecting portion 13 of the shield 8 sandwiched between the outer rings 14a and 14b, whereby a gap is formed between the inner rings 12a and 12b. It is like that. In this state, the outer peripheral surface of the shaft 3 and the inner rings 12a and 12b of the rolling bearings 10A and 10B are bonded with an adhesive.

  According to the rolling bearing unit 1 according to the present embodiment configured as described above, the distance between the outer rings 14a and 14b of the rolling bearings 10A and 10B is determined by the axial thickness of the overhanging portion 13, and thus the rolling bearing. The preload can be easily applied simply by pressing the unit 1 in the direction in which the inner rings 12a and 12b are brought close to each other with the unit 1 fitted into the sleeve 5.

  Further, since the shield 8 has a role of ensuring a predetermined interval between the rolling bearings 10A and 10B and a role of preventing leakage of dust between the inner and outer rings and leakage of grease applied between the inner and outer rings, Costs can be reduced by reducing the number of parts.

  In the present embodiment, the shields 7 and 8 are fitted between the inner and outer rings in a state of being abutted against the step portions 11 of the outer rings 14a and 4b of the rolling bearings 10A and 10B. As shown, the shields 7 and 8 may be arranged so as to cover the inner and outer rings without being abutted against the stepped portion 11.

  Further, in the present embodiment, the overhanging portion 13 extending radially outward is provided at the outer edge portion of the shield 8, but instead, it extends radially inward at the inner edge portion of the shield 8. An overhang portion may be provided. In this case, the shield 8 may be arranged so that the overhanging portion contacts the axial end surface of the inner ring 12a. By doing so, the first rolling bearing 10A and the second rolling bearing 10B are disposed in contact with the overhanging portion between the inner rings 12a and 12b, and a gap is formed between the outer rings 14a and 14b. Therefore, the preload can be easily applied only by pressing the rolling bearing unit 1 in the direction in which the outer rings 14a and 14b are brought close to each other while the rolling bearing unit 1 is fitted in the sleeve 5.

Further, the present embodiment can be modified as follows.
For example, as the rolling bearing unit 101 according to the first modification, as shown in FIG. 5, the first rolling bearing 10 </ b> A and the second rolling bearing 10 </ b> B are arranged with the shield 8 facing each other. It is good as well. By contacting the projecting portions 13 of both shields 8 in an overlapped state, a space corresponding to two axial thicknesses of the projecting portions 13 is provided between the outer rings 14a and 14b. A big gap can be made.

  In the first embodiment, the projecting portion 13 of the shield 8 has been illustrated with a small width in the circumferential direction as shown in FIG. 3, but in this modification, for example, FIG. It is desirable to use one having a large circumferential width as shown. By doing in this way, the overhang | projection parts 13 become easy to overlap, and the positioning of rolling bearing 10A, 10B can be performed easily.

  For example, as a second modified example, as shown in FIG. 7, rolling bearings 10 </ b> A and 10 </ b> B include a substantially flat shield 107 and a ring (fixing member) 108 that fixes the shield 107 to the outer rings 14 a and 14 b. 109, and this ring 109 may have an overhanging portion 13 at the outer edge. In this case, the shield 107 and the ring 108, and the shield 107 and the ring 109 may be disposed so as to abut against the step portion 11 in a state where the shield 107 and the ring 109 overlap each other and close the space between the inner and outer rings. Further, the recess 114 may be provided on the cylindrical surface of the step portion 11 of the outer rings 14a and 14b, and the outer edge portions of the rings 108 and 109 may be fixed by being fitted into the recess 114.

By doing in this way, as the shield 107, an inexpensive and versatile shape can be used. Further, since the projecting portion 13 of the ring 109 also serves as a spacer for securing a predetermined interval between the rolling bearings 10A and 10B, it is not necessary to use a special spacer and the cost can be reduced. .
In this modification, the rolling bearings 10A and 10B may include a ring for fixing the shield to the inner rings 12a and 12b, and an overhang portion may be provided on the inner edge of the ring.

[Second Embodiment]
Next, a rolling bearing unit 201 according to a second embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 8, the rolling bearing unit 201 according to this embodiment includes a ring-shaped spacer 221 sandwiched between the outer rings 14 a and 14 b of the rolling bearings 10 </ b> A and 10 </ b> B, and the shield 208 is replaced with the overhang portion 13. It differs from the first embodiment in that it has a movement preventing part 213 that restricts the movement of the spacer 221 in the radial direction.
In the following, portions having the same configuration as those of the rolling bearing unit 1 according to the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  The shield 208 disposed to face the second rolling bearing 10B of the first rolling bearing 10A is an annular member having an S-shaped cross section over the entire circumference or partially in the circumferential direction. The shield 208 is disposed so that the outer side in the radial direction is abutted against the step portion 11, the inner side in the radial direction is in contact with the inner peripheral surface of the spacer 221, and the space between the inner and outer rings is closed.

  The radially inner side of the shield 208 acts as the movement preventing portion 213, thereby preventing the spacer 221 from shifting in the radial direction even before the rolling bearing unit 201 is fitted to the sleeve 5. it can. Further, it is possible to use a single spacer 221 that is inexpensive and easy to process as compared with the spacer integrated with the outer ring or the spacer integrated with the sleeve, and the cost can be reduced.

  For example, it is desirable that the movement preventing unit 213 and the spacer 221 are fitted with a gap, and the shield 208 is fitted into the outer ring 14a. Accordingly, since the rolling bearing 10A is provided with the shield 208 in advance before it is made into a bearing unit, the rolling bearing 10A prevents the inflow of dust between the inner and outer rings and the leakage of lubricating oil such as grease between the inner and outer rings. Can prevent from the condition.

  In the present embodiment, the rolling bearing unit 201 includes a spacer 221 sandwiched between the outer rings 14 a and 14 b, and the radially inner side of the shield 208 comes into contact with the inner peripheral surface of the spacer 221 to act as the movement preventing unit 213. However, instead of this, the rolling bearing unit 201 is provided with a spacer sandwiched between the inner rings 12a and 12b, and the radial outer side of the shield is brought into contact with the outer peripheral surface of the spacer to act as a movement preventing portion. It is good.

The present embodiment can be modified as follows.
For example, as the rolling bearing unit 201 according to the first modification, as shown in FIG. 9, the first rolling bearing 10 </ b> A and the second rolling bearing 10 </ b> B are arranged with the shield 208 facing each other. It is good as well. By doing so, since the spacer 221 is restricted from moving in the radial direction from both axial ends of the inner peripheral surface, it is possible to reliably prevent displacement.
As shown in FIG. 10, when the rolling bearings 10A and 10B are combined in the axial direction without sandwiching the spacer 221, the movement preventing portion 213 of the shield 208 and the second rolling bearing of the first rolling bearing 10A are combined. Since the shield 7 is not in contact with each other, for example, it can be stacked without being bulky during storage or transportation.

As a second modified example, as shown in FIG. 11, the rolling bearings 10A and 10B include a substantially flat shield 107 and rings 108 and 309 for fixing the shield 107 to the outer rings 14a and 14b. The ring 309 may have a movement preventing portion 313 having an L-shaped cross section that restricts the radial movement of the spacer 221 at the inner edge. In this case, the concave portion 114 is provided on the cylindrical surface of the step portion 11 of the outer rings 14a and 14b, and the shield 107 and the ring 108, and the shield 107 and the ring 109 are brought into contact with the step portion 11 in a state where they are vertically stacked. What is necessary is just to arrange | position so that the space between inner and outer rings may be closed. Further, the movement preventing unit 313 may be disposed so as to protrude outward in the axial direction between the inner and outer rings.
In addition, as shown in FIG. 12, it is good also as using the shield 407 which has the movement prevention part 413 of an L-shaped cross section in an inner edge part, and the ring 408 of a substantially planar shape.

  In this modification, the rolling bearing unit 201 includes a spacer that is sandwiched between the inner rings 12a and 12b, and the rolling bearings 10A and 10B include a ring that fixes the shield to the inner rings 12a and 12b. It is good also as having the movement prevention part which restrict | limits the movement of the spacer to the radial direction in an outer edge part.

As mentioned above, although embodiment of this invention was explained in full detail with reference to drawings, the specific structure is not restricted to this embodiment, The design change etc. of the range which does not deviate from the summary of this invention are included.
For example, in each of the above embodiments, the shape in which the protruding portion 13 of the shield 8, the protruding portion 13 of the ring 109, and the movement preventing portion 313 of the ring 309 are partially provided in the circumferential direction has been described as an example. However, instead of this, the entire periphery of the outer edge portion of the shield 8 or the ring 109 may be the overhanging portion 13, or the entire periphery of the inner edge portion of the ring 309 may be the movement preventing portion 313.
In each of the above embodiments, the shields 8 and 208 are disposed at both ends of the rolling bearings 10A and 10B in the axial direction. However, the shields 8 and 208 are disposed at at least one end in the axial direction of the rolling bearings 10A and 10B. May be arranged.

It is a longitudinal cross-sectional view of the rolling bearing unit which concerns on the 1st Embodiment of this invention. It is an enlarged view of the longitudinal section between the rolling bearings of the rolling bearing unit of FIG. It is the figure which looked at the 1st rolling bearing of FIG. 1 from the axial direction. It is a longitudinal cross-sectional view of the rolling bearing which does not make a shield contact a level | step-difference part. It is a longitudinal cross-sectional view of the rolling bearing unit which concerns on the modification of the 1st Embodiment of this invention. It is the figure which looked at the 1st rolling bearing of FIG. 5 from the axial direction. It is a longitudinal cross-sectional view of the rolling bearing which concerns on the modification of the rolling bearing unit of FIG. It is a longitudinal cross-sectional view of the rolling bearing unit which concerns on the 2nd Embodiment of this invention. It is a longitudinal cross-sectional view of the rolling bearing unit which concerns on the 1st modification of the 2nd Embodiment of this invention. FIG. 10 is a longitudinal sectional view showing a state in which the rolling bearings of FIG. 9 are stacked without a spacer interposed therebetween. It is a longitudinal cross-sectional view of the rolling bearing which concerns on the 1st modification of the 2nd Embodiment of this invention. It is an enlarged view of the longitudinal cross section between the rolling bearings of another rolling bearing unit which concerns on the 1st modification of the 2nd Embodiment of this invention.

Explanation of symbols

1, 101, 201 Rolling bearing unit 3 Shaft (shaft member)
8,208 Shield (Shield member)
13 Overhang 10A First rolling bearing (rolling bearing)
10B Second rolling bearing (rolling bearing)
12a, 12b Inner ring 14a, 14b Outer ring 109, 309 Ring (fixing member)
213, 313, 413 Movement prevention part 221 Spacer

Claims (2)

The inner ring and the outer ring arranged on the same axis, a plurality of rolling elements built in the annular space between the inner and outer rings at intervals in the circumferential direction, and at least one end in the axial direction of the annular space are closed. Two rolling bearings having a shield member disposed at a position and a fixing member that sandwiches and fixes the shield member in a step portion of the outer ring or the inner ring and is disposed in contact with each other in the axial direction ,
A shaft member fitted to the inner ring of these two rolling bearings,
A bearing unit in which at least one of the fixing members is provided with an overhanging portion extending in a radial direction so as to be in contact with and sandwiched between outer rings of the two rolling bearings or inner rings of the two rolling bearings. The inner ring and the outer ring arranged on the same axis, a plurality of rolling elements built in the annular space between the inner and outer rings at intervals in the circumferential direction, and at least one end in the axial direction of the annular space are closed. Two rolling bearings having a shield member arranged at a position and arranged at a predetermined interval in the axial direction ;
A shaft member fitted to the inner ring of these two rolling bearings ;
A ring-shaped spacer sandwiched between the outer rings or the inner rings of the two rolling bearings;
A ring that sandwiches and fixes the shield between the step portions of the outer ring, and
A bearing unit in which at least one of the rings is provided with a movement preventing portion having an L-shaped cross section that restricts movement of the spacer in the radial direction .

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