JP6094637B2 - Roller bearing cage - Google Patents

Description

  The present invention relates to a cage incorporated in a rolling bearing for supporting a rotating system of various mechanical devices (for example, aircraft jet engines and general industrial gas turbines). The present invention relates to an improvement in a technique for preventing a rolling element from dropping in a machined cage that inserts a rolling element while elastically deforming a retention provided by processing.

  2. Description of the Related Art Conventionally, for example, in a rolling bearing for an aircraft jet engine, there is known a cage configuration in which a retention is provided in a pocket of a cage in order to improve the assembling property of the bearing and a margin for a rolling element is formed in the retention. It has been. In this case, the rolling elements are inserted into the pockets while elastically deforming the retention, and the inserted rolling elements are allowed to interfere with the engagement allowance to prevent the rolling elements from falling out of the pockets, and the cage and the rolling elements. Are often used in a state of being assembled as a single piece.

  As a configuration of the retention, for example, as shown in FIG. 3, there is a type in which machining is performed on the central portion in the pocket axial direction on the inner diameter side of the cage and a stake (column portion) 52 is provided between pockets 50 adjacent in the circumferential direction. It is common (see Patent Document 1). When the stake (column part) 52 is provided as a retention in this manner, when inserting the rolling elements 56 into the pockets 50, the stakes 52 on both sides in the circumferential direction of each pocket 50 are separated (that is, The rolling element 56 is pushed into the pocket 50 from the inner diameter side of the cage while elastically deforming in the circumferential direction (to expand the pocket opening 54). Moreover, when such a stake (column part) 52 is provided, generally the hole of the pocket 50 which is a through-hole to the insertion direction (direction shown by the arrow 56a of FIG. 3) and radial direction of the rolling element 56 is provided. A cylindrical portion 58 that is parallel to the axis and narrows the pocket opening 54 is formed on the stake 52 as a contact with the rolling element 56 (that is, the central axis 58s of the cylindrical portion 58 is aligned with the hole axis of the pocket 50). I do it). As a result, when the rolling element 56 is inserted into the pocket 50, the rolling element 56 comes into contact with an edge 58e of the cylindrical portion 58 (an end portion on the inner side of the pocket for allowance), and the edge 58e is rounded (wears due to friction). Even if it is a case, the cost of the entire cylindrical portion 58 can be maintained, and the rolling element 56 can be prevented from falling off the pocket 50.

Japanese Patent No. 3261813

  However, in the configuration in which the stake (column part) 52 is provided as a retention, stress concentrates on the root of the stake 52 during operation of the device (in other words, when the bearing rotates). There is a risk of breakage, and the shape of the stake 52 needs to be optimized as appropriate in accordance with operating conditions. It is possible to adopt a configuration in which a retainer (column portion similar to the stake 52) is also provided on the outer diameter side of the cage, but such an outer diameter side retainer has a higher rigidity than the inner diameter side. Inevitably, it is often difficult to push the rolling element 56 into the pocket 50 from the outer diameter side of the cage.

  The present invention has been made in order to solve such a problem, and its purpose is to provide durability during operation of the apparatus (in other words, during rotation of the bearing) without providing a stake (column portion) as a retention. An object of the present invention is to provide a rolling bearing retainer that is excellent in that it allows a rolling element to be inserted into a pocket from the outer diameter side.

In order to achieve such an object, the present invention includes an annular portion extending at a predetermined length in the axial direction, and a plurality of annular portions arranged at predetermined intervals along the circumferential direction in the annular portion. A rolling bearing retainer comprising pockets and rotatably holding a plurality of rolling elements inserted into the pockets one by one without contact with each other, wherein the pockets are located outside the annular portion. It is formed as a through hole having an opening on each of the radial side and the inner diameter side, and the outer peripheral part of the annular part has a protruding shape on one side in the axial direction of each pocket corresponding to the formation position of the pocket The retention is narrowed on the outer diameter side opening of the pocket, while the first taper portion of the outer peripheral portion and the second taper portion of the inner peripheral portion projecting in a taper shape in the diameter increasing direction , The pocket is elastically deformed in the axial direction. Thereby enabling insertion of the rolling elements, after insertion into said pocket has an engagement allowance portion interferes with the rolling element, the engagement allowance section, expanding the opening portion of the outer diameter side of the pocket A rolling element that has a third tapered portion that is a rolling element contact surface that is inclined in this manner, and that is inclined so as to expand an opening on the outer diameter side of the pocket at the other peripheral edge in the axial direction of the pocket A fourth taper portion which is a contact surface is provided, and the third taper portion and the fourth taper portion are configured in a substantially cylindrical shape having the same cylindrical center axis as the insertion direction of the rolling elements .

  According to the rolling bearing cage of the present invention, without providing a stake (pillar portion) as a retention, a protruding retention that enables insertion into the pocket of the rolling element by elastically deforming in the cage axial direction is provided. By arranging it on one axial side of the outer periphery of the cage, it is possible to improve the durability during operation of the device (in other words, during rotation of the bearing) compared to the case where a stake (column portion) is provided. In addition, the rolling element can be smoothly inserted into the pocket even from the outer diameter side.

It is principal part sectional drawing with respect to the axial direction which shows the structure of the rolling bearing retainer which concerns on one Embodiment of this invention. It is principal part sectional drawing at the time of making the center axis | shaft of the contact margin part (rolling body contact surface) of a retention match with the hole axis of a pocket. It is principal part sectional drawing with respect to the radial direction which shows the structure (structure which provided the stake) of the conventional cage for rolling bearings.

  Hereinafter, the rolling bearing cage of the present invention will be described with reference to the accompanying drawings. The rolling bearing in which the rolling bearing cage according to the present invention (hereinafter also simply referred to as a cage) is incorporated is, for example, a rotating system of various mechanical devices such as aircraft jet engines and general industrial gas turbines. A bearing for supporting the bearing can be assumed, but is not limited thereto.

  Such a rolling bearing (hereinafter, also simply referred to as a bearing) includes an outer ring and an inner ring that are opposed to each other so as to be relatively rotatable around the same rotation axis, and raceways that are formed on opposing circumferential surfaces of the outer ring and the inner ring, respectively, and face each other. As long as it has a plurality of rolling elements that roll between the grooves, the form and size thereof are not particularly limited, and can be arbitrarily set according to the use conditions and purpose of use. . For example, in addition to single-row deep groove ball bearings, the outer ring can be divided into two parts in the axial direction, or the outer ring can be tapered (so-called counterbore) with a sloping shoulder of the raceway groove. It is also possible to assume a configuration in which the axial widths of the outer and inner rings are set to different dimensions. Moreover, although a ball is assumed as the rolling element, the diameter of the rolling element can be arbitrarily set.

  FIG. 1 shows a configuration of a cage 2 according to an embodiment of the present invention. The cage 2 is extended by a predetermined length with respect to the axial direction (the extending direction of the linear rotation center axis S shown in the figure (the vertical direction in the figure), the same applies hereinafter). 2 and a plurality of pockets 6 arranged at predetermined intervals (for example, at equal intervals) along the circumferential direction, one for each pocket 6. The plurality of inserted rolling elements (same balls) 8 are rotatably held at predetermined intervals (same intervals) without contacting each other. In this case, the cage 2 is a so-called rice bran cage made of metal or resin having elasticity. The extension length (axial width), the diameter dimension and the wall thickness (outer inner diameter difference) of the annular portion 4 in the axial direction are the size (diameter dimension) of the rolling element 8 held by the cage 2, and the like. What is necessary is just to set arbitrarily according to a number etc.

  The pocket 6 is formed as a through hole in the radial direction having openings 6a and 6b on the outer diameter side and the inner diameter side of the annular portion 4, respectively. At that time, the pocket 6 sets the hole diameter according to the size (diameter dimension) of the rolling element 8 so that the inserted rolling element 8 can be rotatably held, and the cage 2. What is necessary is just to set the number of arrangement | positioning according to the load capacity (number of rolling-elements to be integrated with respect to the cage 2).

  A protrusion-like retention 10 is provided on the outer peripheral portion of the annular portion 4 on one side in the axial direction of each pocket 6 (in the configuration shown in FIG. 1, on the upper side in the axial direction) corresponding to the position where the pocket 6 is formed. It has been. That is, the same number of retentions 10 as the pockets 6 are arranged on the outer peripheral portion of the annular portion 4 with the same phase as each pocket 6 in the circumferential direction (at the same pitch as the pockets 6). It has become. In addition, what is necessary is just to provide the retention 10 with respect to the outer peripheral part of the annular part 4 so that it may become the said form by machining with respect to the holder | retainer 2 (pocket 6).

  The retention 10 protrudes in the diameter increasing direction while narrowing the opening 6 a on the outer diameter side of the pocket 6. FIG. 1 shows, as an example, a configuration of a retention 10 that protrudes from the outer peripheral side peripheral portion in the diameter increasing direction so as to narrow the opening 6a from the outer peripheral peripheral portion. Note that the protrusion length of the retention 10 in the diameter-enlarging direction and the protrusion width in the circumferential direction (corresponding to the range in which the opening 6a is narrowed on the outer diameter side of the pocket 6) are inserted (held) into the pocket 6. Since it can be arbitrarily set according to the size (diameter dimension) of the moving body 8, it is not particularly limited here.

Since the retention 10 is thus projected from the outer peripheral side peripheral portion of the pocket 6 (opening 6a), when the rolling element 8 is inserted into the pocket 6, the retention 10 is axially (in FIG. 1). , Upward), the rolling element 8 can be inserted into the pocket 6. That is, by applying a predetermined force in the axial direction (upward in FIG. 1) to the retention 10, the retention 10 is elastically deformed so as to expand the opening 6a on the outer diameter side of the pocket 6. Thus, the rolling element 8 can be smoothly inserted into the pocket 6 from the expanded opening 6a. Specifically, the rolling element 8 is brought into contact with the retention 10 and pressed in a predetermined direction (in the direction in which the rolling element 8 is inserted into the pocket 6 indicated by an arrow 8a in FIG. 1), the A pressing force is applied to the retention 10 in the axial direction, and the retention 10 is elastically deformed so as to expand the opening 6a. In this state in which the retention 10 is elastically deformed, the rolling element 8 is pushed into the pocket 6 along the retention 10 (specifically, the rolling element contact surface 12 of the hooking portion 10a described later). Thus, the rolling element 8 can be smoothly inserted into the pocket 6 from the outer diameter side of the cage 2.
After the rolling element 8 is inserted into the pocket 6, the force applied during the insertion (specifically, the pressing force from the rolling element 8 in the axial direction) is released, so that the retention 10 is retained. In other words, it can be elastically deformed again to the state where the opening 6a is narrowed, so that it can interfere with the rolling elements 8 inserted into the pocket 6.

  The retention 10 has a barb portion 10 a that interferes with the rolling elements 8 inserted into the pocket 6, and the barb portion 10 a has a cylindrical shape that is parallel to the insertion direction 8 a of the rolling elements 8 into the pocket 6. There is no. Specifically, a cylindrical shape that is axially parallel to the insertion direction 8a of the rolling element 8 between the other side (the lower side in the axial direction in FIG. 1) of the pocket 6 in the outer peripheral part of the annular part 4 Make. In other words, the barb portion 10a has a central axis (cylindrical central axis) 10s that is a surface (hereinafter referred to as a rolling element contact surface) 12 that contacts the rolling element 8 when the rolling element 8 is inserted into the pocket 6. Is a circumferential surface parallel to the insertion direction 8a of the rolling element 8. Further, the other peripheral edge portion in the axial direction of the pocket 6 is inclined (tapered) so as to expand the opening 6a on the outer diameter side of the pocket 6 (hereinafter, the other side forming the tapered shape). The peripheral portion is referred to as a tapered portion 14), and the tapered portion 14 and the rolling element contact surface 12 of the hooking portion 10 a are configured to have a substantially cylindrical shape.

  In addition, the inner diameter dimension of the rolling element contact surface 12 and the taper part 14 of the hooking margin portion 10 a having a substantially cylindrical shape is set slightly smaller than the diameter dimension of the rolling element 8, and these are smaller than the rolling element 8. And having a predetermined allowance. The magnitude of the allowance can be arbitrarily set according to the material of the cage 2 (retention 10), the size of the rolling element 8, and the like. In the present embodiment, as an example, the bearing is incorporated in a bearing having a bearing inner diameter (inner ring inner diameter) of 40 mm, a bearing outer diameter (outer ring outer diameter) of 70 mm, a bearing width of 30 mm, and the rolling element 8 having a diameter of 8.731 mm. In the vessel 2, the inner diameter (inner cylinder diameter) of the cutting margin portion 10 a (the rolling element contact surface 12) and the tapered portion 14 is set to 8.6 mm.

  Further, the cylindrical central axis 10 s of the hooking portion 10 a is inclined with respect to the hole axis 6 s of the pocket 6. In the configuration shown in FIG. 1, since the retention 10 is provided on the upper side of the pocket 6 in the axial direction, the cylindrical central axis 10s of the hooking portion 10a is inclined to the pocket 6 so as to tilt backward in the insertion direction 8a of the rolling element 8. Is inclined with respect to the hole axis 6s.

  Here, as shown in FIG. 2, the engagement margin 60 a (the rolling element contact surface 72) of the retention 60 is configured such that its central axis (cylindrical central axis) 60 s coincides with the hole axis 66 s of the pocket 66. In this case, the workability can be improved, and the cutting margin 60a can be easily formed. On the other hand, in this case, the barb portion 60a (the rolling element contact surface 72) has a configuration in which the cylindrical central axis 60s is shifted (not parallel) from the insertion direction 68a of the rolling element 68. Therefore, when the rolling element 68 is inserted into the pocket 66, the rolling element 68 is concentrated not on the entire rolling element contact surface 72 but on the inner diameter side end (edge) 72a of the rolling element contact surface 72. It will abut. For this reason, there is a possibility that the edge 72a of the rolling element contact surface 72 may be rounded (wear due to friction), and in this case, the margin for the rounded edge 72a is reduced. As a result, the interference with the rolling element 68 becomes insufficient, and there is a possibility that the rolling element 68 is likely to fall from the pocket 66. At this time, if the roundness of the edge 72a is estimated in advance to increase the initial engagement margin (in other words, the inner diameter dimension of the engagement margin portion 60a (the rolling element contact surface 72) is reduced), the pocket of the rolling element 68 is obtained. When the rolling element 68 comes into contact with the edge 72a during insertion into 66, the surface pressure on the surface of the rolling element becomes high, and scratches easily occur.

  However, in the present embodiment, the hooking portion 10a has a cylindrical shape parallel to the insertion direction 8a of the rolling element 8 into the pocket 6 (in other words, the rolling element contact surface 12 is inserted by the cylindrical central axis 10s). Therefore, the rolling element 8 can be brought into contact with the entire rolling element contact surface 12 when inserted into the pocket 6, and the inner diameter side end of the rolling element contact surface 12 can be made. It is possible to effectively avoid intensive contact with the portion (edge). That is, it is possible to prevent a reduction in the allowance due to rounding of the inner diameter side end (edge) of the rolling element contact surface 12. Therefore, it is possible to set the margin so that the surface pressure of the rolling element surface when the rolling element 8 is inserted into the pocket 6 is sufficiently low (below the yield stress), and scratches on the rolling element surface can be set. It is possible to reliably prevent the rolling element 8 from falling out of the pocket 6 due to the occurrence of the above and the rounded edge as described above.

  As described above, according to the cage 2 according to this embodiment, it is possible to insert the rolling element 8 into the pocket 6 by elastically deforming in the cage axial direction without providing a stake (column portion) as a retention. Is disposed on one side in the axial direction of the outer peripheral portion of the cage, so that when the apparatus is in operation (in other words, when the bearing is rotated), compared to the case where the stake (column portion) is provided. The durability can be improved, and the rolling element 8 can be smoothly inserted into the pocket 6 even from the outer diameter side.

2 Cage 4 Ring 6 Pocket 6a, 6b Opening 8 Rolling Element 10 Retention

Claims (1)

A plurality of annular portions that extend in a predetermined length with respect to the axial direction, and a plurality of pockets that are arranged at predetermined intervals along the circumferential direction in the annular portion; A rolling bearing retainer that rotatably holds the rolling elements at a predetermined interval without bringing them into contact with each other,
The pocket is formed as a through hole having openings on the outer diameter side and the inner diameter side of the annular part,
On the outer peripheral portion of the annular portion, a protrusion-like retention is provided on one side in the axial direction of each pocket corresponding to the formation position of the pocket,
The retention is formed by narrowing the opening on the outer diameter side of the pocket and elastically deforming in the axial direction with a first taper portion on the outer peripheral portion and a second taper portion on the inner peripheral portion protruding in a taper shape in the diameter increasing direction. And allowing the rolling element to be inserted into the pocket, and having a margin portion that interferes with the rolling element after insertion into the pocket,
The hooking portion has a third taper portion that is a rolling element contact surface that is inclined so as to expand the opening on the outer diameter side of the pocket,
A fourth taper portion that is a rolling element contact surface that is inclined so as to expand the opening on the outer diameter side of the pocket is provided at the peripheral portion on the other side in the axial direction of the pocket,
The rolling bearing retainer, wherein the third taper portion and the fourth taper portion are formed in a substantially cylindrical shape having the same cylindrical center axis as the insertion direction of the rolling elements .

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