JP2012082877A - Planetary gear-integrated bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a planetary gear-integrated bearing that has improved assemblability.SOLUTION: The planetary gear-integrated bearing includes a planetary gear 1 having a raceway 2 on an inner circumference face, a plurality of rolling elements 3 disposed freely rollably in a circumference direction on the raceway 2, and a ring-like cage 4 having a plurality of pockets 5 that house the rolling elements 3 freely rollably and separated from one another in the circumference direction. The planetary gear 1 has a plurality of ribs 1a, 1b, 1c on the inner circumference face for axially positioning the rolling elements 3. Slip stops 5a for preventing the rolling element 3 from slipping into an inner diameter side of the cage are formed in a portion of the pocket 5 of the cage 4, the portion in the opening in the inner diameter side of the cage and facing in a circumference direction. The difference d between the radius R1 of a pitch circle of the rolling element 3 in contact with the slip stops 5a, and the radius R2 of a pitch circle of the rolling element 3 in contact with the raceway 2 of the planetary gear 1 is set to be equal to or larger than the height h of the ribs 1a, 1b, 1c.

Description

  The present invention relates to a planetary gear integrated bearing that uses an inner peripheral surface of a gear as a bearing raceway surface in a planetary gear used in a transmission or the like. More specifically, the present invention relates to a large planetary gear integrated bearing used for, for example, a speed increaser of a wind power generator.

  For planetary gears used in the gearboxes of wind power generators, the outer ring of the bearing can be omitted and the inner peripheral surface of the gear used as the bearing raceway for the purpose of reducing the gearbox weight and size. (For example, Patent Document 1, FIG. 3). When this planetary gear has a plurality of flange portions that axially separate the rolling elements of the bearing, in order to incorporate the rolling elements into the gear, the rolling elements are radiated toward the pocket of the cage placed on the inner diameter side of the gear. It is necessary to press fit in the direction.

German Patent Application Publication No. 10 2005 049 185

However, since the planetary gear has a complicated outer diameter and a large mass compared to a normal bearing outer ring, it is difficult to handle and the press-fitting operation is not easy.
Further, when the bearing manufacturer supplies only the bearing part excluding the gear, the press-fitting operation needs to be performed by the gearbox manufacturer, and there is a concern that the press-fitting device is not provided.

  An object of the present invention is to provide a planetary gear integrated bearing capable of improving assembly.

  A planetary gear integrated bearing according to the present invention includes a planetary gear having a raceway on an inner peripheral surface, a plurality of rolling elements arranged on the raceway so as to be freely rollable in a circumferential direction, and these rolling elements in a circumferential direction. A planetary gear integrated bearing including a plurality of ring-shaped cages having a plurality of pockets that are spaced apart and rollably accommodated, and the planetary gear includes a plurality of flange portions that axially position the rolling elements on an inner peripheral surface thereof. The retainer pocket is provided with a retaining portion for preventing the rolling element from coming out toward the inner diameter side of the cage at a portion facing the circumferential direction of the opening on the inner diameter side of the cage, and is brought into contact with the retaining portion. The difference between the pitch circle radius of the rolling element and the pitch circle radius of the rolling element brought into contact with the orbit of the planetary gear is set to be equal to or higher than the height of the collar portion.

  According to this configuration, the rolling element is accommodated in the pocket of the cage in advance to form an assembly (hereinafter referred to as a subassembly), so that the subassembly is not obstructed by the flange of the planetary gear, and the inner diameter of the planetary gear is prevented. It can be inserted axially towards the part. Therefore, the conventional press-fitting work of pressing the rolling element in the radial direction toward the pocket of the cage after arranging the cage on the inner diameter side of the planetary gear becomes unnecessary. In other words, after inserting the sub-assembly in which the rolling elements contained in the cage pockets are shifted to the inner diameter side into the inner diameter portion of the planetary gear, the rolling elements in the cage pocket are pushed toward the outer diameter side toward the planetary gear. As a result, the assembly is completed.

  In the present invention, the cage may be guided by the planetary gear. Thus, by guiding the cage with the planetary gear, the behavior of the cage during operation can be stabilized. When the cage is guided only by the rolling elements, the cage is guided by the retaining portion of the pocket and swings greatly in the radial direction.

  When the cage is guided by the planetary gear, it is desirable that the cage is guided by the inner peripheral surface of the collar portion of the planetary gear. In this way, when the cage is guided by the inner peripheral surface of the flange portion of the planetary gear, the raceway between the cage and the planetary gear does not come into contact, so that no harmful damage occurs on the raceway.

In the present invention, a second retaining portion for preventing the rolling element from coming out to the outer diameter side of the cage is provided at a portion facing the circumferential direction of the opening on the outer diameter side of the cage in the pocket of the cage. Also good.
As described above, when the second retaining portion for preventing the rolling element from coming out to the outer diameter side of the cage is provided in the circumferential direction of the opening on the outer diameter side of the cage in the pocket of the cage. This improves the handling of the subassembly. That is, in the state of the subassembly, the rolling element does not fall off from the outer diameter side of the cage.

  In this invention, the opposing distance in the circumferential direction of each pocket of the first or second retaining portion in the pocket of the cage is such that the rolling element can pass by elastically deforming the cage. It is desirable to set to. In such a configuration, the rolling element can pass through the pocket by elastically deforming the cage, so that the subassembly can be easily manufactured. That is, the sub-assembly can be easily assembled by pressing the rolling elements into the pockets.

In this invention, you may provide the suspension tap hole which is a tap hole for lifting in the side surface of the said holder | retainer.
Since the planetary gear used for the gearbox of the wind power generator is heavy, it is difficult to handle, and it is not easy to insert the subassembly into the inner diameter portion thereof. When a suspension tap hole is provided on the side of the cage, the suspension tap can be removably attached to the side of the cage using the suspension tap hole, so that the subassembly can be lifted and inserted into the planetary gear. Thus, the insertion property of the subassembly into the planetary gear is improved.
In this case, you may provide three said hanging tap holes equally distributed in the circumferential direction. Thus, when three suspension tap holes are equally arranged in the circumferential direction, when the subassembly is assembled into the planetary gear, it becomes easy to align both axes. That is, it is easier to level the sub-assembly than two-point or four-point suspension.

In this invention, the third retaining portion for preventing the rolling element from slipping toward the inner diameter side of the cage at a portion facing the circumferential direction closer to the planetary gear than the first retaining portion in the pocket of the cage. And the opposing distance in the circumferential direction at each pocket of the third retaining part may be set smaller than the diameter of the rolling element and larger than the opposing distance of the first retaining part. .
In the case of this configuration, the handleability of the subassembly is improved. That is, the rolling element can be temporarily fixed in the pocket of the cage by the third retaining portion. When the subassembly is assembled into the planetary gear, the rolling element may fall off the cage or the cage. It will not move in your pocket. Moreover, the insertion property of the planetary pin to the inner diameter side of the subassembly is also improved. That is, since the rolling element after being pushed into the outer diameter side in the pocket toward the planetary gear can be prevented from approaching the inner diameter side of the cage, the third retaining part can prevent the rolling element from moving toward the planetary gear. There is no hindrance to pin insertion.
In this case, the opposing distance in the circumferential direction at each pocket of the third retaining portion in the pocket of the cage is set so that the rolling element can pass through by elastically deforming the cage. Is desirable. Thus, the handling distance of the subassembly is improved by setting the facing distance of the third retaining portion to a dimension that allows the rolling elements to pass by elastically deforming the cage. That is, the rolling element can be easily moved back and forth in the radial direction across the third retaining portion in the pocket of the cage.

  In the present invention, an insertion guide chamfer may be provided at the end of the planetary pin that is inserted into the inner diameter side of the subassembly in which the rolling element is accommodated in the cage. When the chamfer is provided in this way, the insertion property of the planetary pin is improved.

  A planetary gear integrated bearing according to the present invention includes a planetary gear having a raceway on an inner peripheral surface, a plurality of rolling elements arranged on the raceway so as to be freely rollable in a circumferential direction, and these rolling elements in a circumferential direction. A planetary gear integrated bearing including a plurality of ring-shaped cages having a plurality of pockets that are spaced apart and rollably accommodated, and the planetary gear includes a plurality of flange portions that axially position the rolling elements on an inner peripheral surface thereof. The retainer pocket is provided with a retaining portion for preventing the rolling element from coming out toward the inner diameter side of the cage at a portion facing the circumferential direction of the opening on the inner diameter side of the cage, and is brought into contact with the retaining portion. The difference between the pitch circle radius of the rolling element and the pitch circle radius of the rolling element brought into contact with the orbit of the planetary gear is set to be equal to or higher than the height of the collar, so that the cage containing the rolling element is a planetary gear. Set of planetary gear integrated bearings Standing property can be improved, it becomes possible assembly of the bearings in the speed increaser manufacturer having no rolling elements press-fitting device.

It is sectional drawing of the planetary gear integrated bearing concerning one Embodiment of this invention. It is a disassembled perspective view of the bearing. It is a disassembled perspective view of the subassembly in the planetary gear integrated bearing concerning other embodiment of this invention. It is sectional drawing of the subassembly.

  An embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows a sectional view of the planetary gear integrated bearing of this embodiment, and FIG. 2 shows an exploded perspective view thereof. As shown in FIG. 1, the planetary gear integrated bearing includes a planetary gear 1 having a raceway 2 on an inner peripheral surface, a plurality of rolling elements 3 arranged on the raceway 2 so as to be freely rollable in a circumferential direction, And a ring-shaped cage 4 that holds the rolling element 3 in a freely rollable manner. The track 2 on the inner peripheral surface of the planetary gear 1 is formed in a double row (in this case, two rows) aligned in the axial direction as shown in FIG. 2, and a plurality of rolling elements 3 are arranged on each track 2 so as to be freely rollable. The Two cages 4 are arranged side by side in the axial direction corresponding to the double-row orbit 2. These cages 4 have pockets 5 for accommodating rolling elements at a plurality of locations in the circumferential direction. By accommodating the rolling elements 3 in these pockets 5, the respective rolling elements 3 are separated from each other in the circumferential direction and are held so as to be freely rotatable. Here, the rolling element 3 accommodated in the pocket 5 is a cylindrical roller. The pocket 5 is formed by being surrounded by two annular strips 6 and 7 extending in the circumferential direction on both sides of the cage 4 and a pillar 8 spanned between the strips 6 and 7. .

  On the inner peripheral surface of the planetary gear 1, as shown in FIG. 2, three collar portions 1 a, 1 b, 1 c for positioning the double row rolling elements 3 apart in the axial direction are provided side by side in the axial direction. Yes. That is, the first collar portion 1a is provided at one axial end portion of the inner circumferential surface of the planetary gear 1, and the planetary gear 1 in which the second collar portion 1b sandwiches one orbit 2 with the first collar portion. The other end in the axial direction of the inner peripheral surface of the planetary gear 1 is provided at an intermediate position in the axial direction of the inner peripheral surface of the planetary gear 1 and the third collar portion 1c sandwiches the other orbit 2 with the second collar portion 1b. Provided in the department. These collar portions 1a, 1b, and 1c are formed as ring-shaped ridges extending in the circumferential direction on the inner peripheral surface of the planetary gear 1, and the protruding heights h thereof are the same.

  In each pocket 5 of the cage 4, a pair of inner wall surfaces facing each other in the circumferential direction are formed on flat surfaces that are parallel to each other except for a part. As shown in FIG. 2, the opening on the inner diameter side of the cage 5 in the pocket 5 is provided with a retaining portion 5 a that prevents the rolling elements 3 from coming to the inner diameter side of the cage at opposing portions facing each other in the circumferential direction. ing. Here, at each of the opposing portions, two retaining portions 5a are arranged apart from each other in the axial direction. That is, four retaining portions 5 a are provided for each pocket 5. Each retaining portion 5a is provided as a claw-like protrusion. Then, as shown in FIG. 1, the difference between the pitch circle radius R1 of the rolling element 3 brought into contact with the retaining portion 5a and the pitch circle radius R2 of the rolling element 3 brought into contact with the track 2 of the planetary gear 1 is obtained. The radial position of the retaining portion 5a is set so that d is equal to or higher than the height h of the collar portions 1a, 1b, 1c of the planetary gear 1.

  When the radial position of the retaining portion 5a is set in this way, the rolling element 3 is previously accommodated in the pocket 5 of the retainer 4 to form a subassembly 9 (FIG. 2). It can be inserted in the axial direction toward the inner diameter portion of the planetary gear 1 without being obstructed by the flange portions 1a, 1b, 1c, and the cage 4 is disposed on the inner diameter side of the planetary gear 1 and then the cage 4 Thus, the conventional press-fitting work of press-fitting the rolling element 3 in the radial direction toward the pocket 5 becomes unnecessary. That is, after inserting the subassembly 9 in a state where the rolling elements 3 accommodated in the pockets 5 of the cage 4 are shifted to the inner diameter side into the inner diameter portion of the planetary gear 1, the rolling elements 3 in the cage pocket 5 are inserted into the planetary gears 1. Assembling is completed by pushing inward toward the outer diameter side, so assembling is improved.

  Further, in this planetary gear integrated bearing, the cage 4 is guided by the planetary gear 1. Specifically, the cage 4 is guided on the inner peripheral surfaces of the flange portions 1a, 1b, and 1c of the planetary gear 1. In this way, by guiding the cage 4 with the planetary gear 1, the behavior of the cage 4 during operation can be stabilized. When the cage 4 is guided only by the rolling elements 3, the cage 4 is guided by the retaining portion 5a of the pocket 5 and swings greatly in the radial direction. In particular, when the cage 4 is guided by the inner peripheral surfaces of the flange portions 1a, 1b, and 1c of the planetary gear 1, the cage 4 and the raceway 2 of the planetary gear 1 do not contact with each other, so that no harmful damage is caused to the raceway 2. After inserting the planetary pin 10 into the inner diameter side of the subassembly 9 in which the rolling element 3 is accommodated in the cage 4, the rolling element 3 is pushed to the outer diameter side by the planetary pin 10. The retaining portion 5a of the pocket 5 does not interfere with each other.

  In addition, the opposing distance in the circumferential direction of the retaining portion 5a in each pocket 5 of the cage 4 is set such that the rolling element 3 can pass through elastic deformation of the cage 4. When the dimensions are set in this way, the rolling element 3 can pass through the pocket 5 by elastically deforming the cage 4, so that the subassembly 9 can be easily manufactured. That is, the subassembly 9 can be easily assembled by press-fitting the rolling element 3 into the pocket 5.

Further, in this planetary gear integrated bearing, as shown in FIG. 2, a suspension tap hole 11 which is a lifting tap hole is provided on the side surface of the cage 4. Here, three of the hanging tap holes 11 are provided in the circumferential direction so as to be equally distributed.
Since the planetary gear used for the gearbox of the wind power generator is heavy, it is difficult to handle and it is not easy to insert the subassembly 9 into the inner diameter portion thereof. When the suspension tap hole 11 is provided on the side surface of the cage 4, the suspension tap 12 can be removably attached to the side surface of the cage 4 using the suspension tap hole 11 as shown in FIG. 9 can be lifted and inserted into the planetary gear 1, and the insertability of the subassembly 9 into the planetary gear 1 is improved. When the three suspension tap holes 11 are equally arranged in the circumferential direction, when the subassembly 9 is assembled into the planetary gear 1, both axis centers can be easily aligned. That is, the sub-assembly 9 can be easily leveled compared to the 2-point or 4-point suspension.

  Further, in this embodiment, as shown in FIG. 2, the end portion of the planetary pin 10 to be inserted into the inner diameter side of the subassembly 9 in which the rolling element 3 is accommodated in the cage 4 is chamfered for insertion guidance. A chamfer 10a, a so-called lead-in chamfer, is provided. Thus, by providing the chamfer 10a at the end of the planetary pin 10, the insertion property of the planetary pin 10 into the subassembly 9 is improved.

  3 and 4 show another embodiment of the present invention. The configuration of the planetary gear 1 and the planetary pin 10 is the same as in the previous embodiment, and is not shown here. Further, in this embodiment, the matters other than the particularly described items are the same as those in the first embodiment. In the planetary gear integrated bearing of this embodiment, as shown in an exploded perspective view in FIG. 3, the retainer 4 is composed of a retainer main body portion 4 </ b> A in which an annular belt portion 6 and a pillar portion 8 on one side are integrated. The cage lid portion 4B is composed of the annular band portion 7 on the other side, and the cage main body portion 4A and the cage lid portion 4B are fastened and integrated with a flange 13. That is, after putting the rolling element 3 in each pocket 5 of the cage main body 4A, the subassembly 9 is assembled by covering the pillar 8 protruding side of the cage main body 4A with the cage lid 4B.

  Moreover, in this embodiment, as shown in FIG. 4, a pair of inner wall surfaces facing each other in the circumferential direction of the pockets 5 of the cage 4 are two partial cylindrical surfaces divided into an inner diameter side and an outer diameter side. A first retaining portion 5a similar to the case of the previous embodiment is provided at a portion formed and opposed to the circumferential direction of the opening on the cage inner diameter side, and the circumference of the opening on the cage outer diameter side A second retaining portion 5b for preventing the rolling element 3 from coming off to the outer diameter side is provided at a portion facing the direction. In addition, the side surface of the pocket 5 has an outer peripheral section formed in an arcuate shape, and among the portions along the arc, the portion with which the rolling element 3 is engaged becomes the second retaining portion 5b. The facing distance W1 in the circumferential direction of the first retaining portion 5a and the facing distance W2 in the circumferential direction of the second retaining portion 5b are dimensions that the rolling elements 3 cannot pass through. For this reason, the rolling element 3 does not fall off from the subassembly 9 after being fastened by the flange 13.

  Furthermore, in this embodiment, the boundary of the two partial cylindrical surfaces in the cage pocket 5, that is, the portion facing the circumferential direction closer to the planetary gear 1 than the first retaining portion 5 a is held by the rolling element 3. The third retaining portion 5c is intended to prevent the inner diameter side from falling off. The facing distance W3 in the circumferential direction at each pocket 5 of the third retaining portion 5c is set to be smaller than the diameter of the rolling element 3 and larger than the facing distance W1 of the first retaining portion 5a. Yes.

  By providing the third retaining portion 5c in this way, the handleability of the subassembly 9 is improved. That is, the rolling element 3 can be temporarily fixed in the pocket 5 of the cage 4 by the third retaining portion 5c, and when the subassembly 9 is assembled in the planetary gear 1, the rolling element 3 is It will not fall off from the 4 or move in the pocket 5 of the cage 4. Moreover, the insertion property of the planetary pin 10 (see FIG. 2) to the inner diameter side of the subassembly 9 is also improved. That is, since the rolling element 3 after being pushed toward the outer diameter side in the pocket 5 toward the planetary gear 1 can be prevented from approaching the inner diameter side of the cage 4, the third retaining portion 5 c can prevent the rolling element 3. The rolling element 3 does not hinder the insertion of the planetary pin 10.

  The opposing distance W3 in the circumferential direction at each pocket 5 of the third retaining portion 5c is set such that the rolling element 3 can pass by elastically deforming the cage 4. Thus, the handling property of the subassembly 9 is improved by setting the facing distance W3 of the third retaining portion 5c to a dimension that allows the rolling element 3 to pass by elastically deforming the cage 4. That is, in the pocket 5 of the cage 4, the rolling element 3 can be easily moved back and forth across the third retaining portion 5 c in the radial direction.

  Note that the opposing distances W1 and W2 of the first and second retaining portions 5a and 5b may also be set to have dimensions that allow the rolling element 3 to pass by elastically deforming the cage 4. When the dimensions are set in this way, the rolling element 3 can pass through the pocket 5 by elastically deforming the cage 4, and thus the handling property of the subassembly 9 is improved. That is, when the subassembly 9 is manufactured, the rolling element 3 can be pressed into the pocket 5 in the radial direction.

DESCRIPTION OF SYMBOLS 1 ... Planetary gear 1a, 1b, 1c ... Collar part 2 ... Orbit 3 ... Rolling body 4 ... Cage 5 ... Pocket 5a ... 1st retaining part 5b ... 2nd retaining part 5c ... 3rd retaining part 9 ... Subassembly 10 ... Planetary pin 10a ... Chamfer 11 ... Hanging tap holes R1, R2 ... Pitch circle radius h of rolling elements ... Height of collar

Claims (10)

A planetary gear having a track on the inner peripheral surface, a plurality of rolling elements arranged on the track so as to be able to roll in a circumferential direction, and these rolling elements being spaced apart in the circumferential direction and accommodated in a freely rolling manner. A planetary gear-integrated bearing having a plurality of collar portions for positioning the rolling elements in the axial direction on the inner peripheral surface of the planetary gear.
A retaining portion for preventing the rolling element from coming out to the inner diameter side of the cage is provided at a portion of the pocket of the cage facing the circumferential direction of the opening on the inner diameter side of the cage, and the rolling contact with the retaining portion is provided. A planetary gear integrated bearing, wherein a difference between a pitch circle radius of a moving body and a pitch circle radius of a rolling element brought into contact with a raceway of the planetary gear is set to be equal to or greater than a height of the collar portion.   The planetary gear integrated bearing according to claim 1, wherein the cage is guided by the planetary gear.   3. The planetary gear integrated bearing according to claim 2, wherein the cage is guided by the inner peripheral surface of the flange portion of the planetary gear.   4. The rolling element according to claim 1, wherein the rolling element is prevented from coming off to the outer diameter side of the cage at a portion facing the circumferential direction of the opening on the outer diameter side of the cage in the pocket of the cage. 5. A planetary gear-integrated bearing provided with a second retaining portion to be intended.   In Claim 4, it becomes a dimension which a rolling element can pass by elastically deforming a cage | basket | matter in the circumferential direction opposing distance in each pocket of the 1st or 2nd retaining part in the pocket of the said cage | basket. Planetary gear integrated bearing set as follows.   The planetary gear integrated bearing according to any one of claims 1 to 5, wherein a suspension tap hole that is a lifting tap hole is provided on a side surface of the cage.   The planetary gear integrated bearing according to claim 6, wherein the three suspension tap holes are equally arranged in the circumferential direction.   In any 1 paragraph of Claims 1 thru / or 7, in the part which faces the circumference direction near the planetary gear rather than the 1st above-mentioned prevention part in the pocket of the above-mentioned cage, it is to the inside diameter of the cage of a rolling element. A third retaining portion for preventing retaining is provided, and a circumferential facing distance in each pocket of the third retaining portion is smaller than the diameter of the rolling element, and the first retaining portion Planetary gear integrated bearing set larger than the opposing distance.   In Claim 8, the opposing distance of the circumferential direction in each pocket of the 3rd retaining part in the pocket of the said retainer is set so that it may be a dimension which a rolling element can pass by elastically deforming a retainer. Planetary gear integrated bearing.   The planetary gear integrated bearing according to any one of claims 1 to 9, wherein a chamfer is provided at an end of a planetary pin inserted into an inner diameter side of an assembly in which the rolling element is accommodated in the cage.

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