JP2017082896A - Planetary gear device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To further improve lifetime of a main bearing of a planetary gear drive.SOLUTION: A planetary gear drive 10 includes a planetary gear 12, an internal gear 14, a casing 16, a first carrier 20 arranged on one side in an axial direction of the planetary gear, a second carrier 30 connected to the first carrier 20, a first main bearing 40 arranged between the first carrier and the casing; and a second main bearing 50 arranged between the second carrier and the casing. The first carrier has a first pillar part 27 protruding toward the second carrier, and a first knock pin hole 28 opening at a tip end surface 27E of the first pillar part. The second carrier opens at a surface 37E opposing to the first carrier and includes a second knock pin hole 38 corresponding to the first knock pin hole. The first knock pin hole is a bottomed hole which does not penetrate the first carrier in the axial direction, and the second knock pin hole is a bottomed hole which does not penetrate the second carrier in the axial direction.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a planetary gear device.

  Patent Document 1 discloses a planetary gear device. This planetary gear device is called an eccentric oscillating type, and has a planetary gear that makes planetary motion and an internal gear that meshes with the planetary gear. The internal gear is integrated with the casing. A first carrier is disposed on one side of the planetary gear in the axial direction, and a second carrier connected to the first carrier is disposed on the other side in the axial direction. A first main bearing is disposed between the first carrier and the casing, and a second main bearing is disposed between the second carrier and the casing.

  The first carrier has a first pillar portion protruding toward the second carrier. A first knock pin hole is opened at the distal end surface of the first column portion. A second knock pin hole corresponding to the first knock pin hole is formed in the second carrier so as to penetrate the second carrier. The first carrier and the second carrier are connected by a knock pin and a connecting bolt.

  Specifically, after the knock pin is driven into the first knock pin hole, the second knock pin hole is aligned with the knock pin, and the second carrier is connected to position the second carrier relative to the first carrier. In this state, the first carrier and the second carrier are coupled by screwing the coupling bolt from the second carrier side to the first carrier side.

WO2009 / 101654A1 (FIG. 1)

  However, the planetary gear device configured as described above has a problem that the life of the main bearing, particularly the second main bearing on the second carrier side, is likely to be reduced.

  The present invention has been made to solve such a conventional problem, and an object thereof is to further improve the life of the main bearing of the planetary gear device.

  The present invention includes a planetary gear, an internal gear meshing with the planetary gear, a casing integrated with the internal gear, a first carrier disposed on one axial side of the planetary gear, and the planetary gear. A second carrier disposed on the other axial side of the gear and connected to the first carrier; a first main bearing disposed between the first carrier and the casing; the second carrier and the casing; A planetary gear device including a second main bearing disposed between the first carrier, the first carrier projecting toward the second carrier, and a tip surface of the first pillar. A first knock pin hole that opens, the second carrier has an opening on a surface facing the first carrier, has a second knock pin hole corresponding to the first knock pin hole, and the first knock pin. The hole penetrates the first carrier in the axial direction Is not perforated bottom hole, the second knock pin holes, with the structure of the second carrier is a perforated bottom hole not penetrating in the axial direction, is obtained by solving the above problems.

  In the present invention, the first knock pin hole is a bottomed hole that opens to the front end surface of the first column portion protruding toward the second carrier. The second knock pin hole is a bottomed hole corresponding to the first knock pin hole that opens on the surface facing the first carrier. That is, the first knock pin hole does not penetrate the first carrier in the axial direction, and the second knock pin hole does not penetrate the second carrier in the axial direction.

  Thereby, both the rigidity of a 1st carrier and a 2nd carrier can be maintained highly, and the roundness of the rolling surface of a main bearing can be maintained highly. As a result, the rotational smoothness of the first and second carriers can be maintained high, and the life of the main bearing can be further improved.

  ADVANTAGE OF THE INVENTION According to this invention, the lifetime of the main bearing of a planetary gear apparatus can be improved more.

Sectional drawing of the planetary gear apparatus which concerns on an example of embodiment of this invention. FIG. 2 is an exploded cross-sectional view of a first carrier, a second carrier, and a knock pin of the planetary gear device of FIG. 1. The side view which looked at the 2nd carrier from the 1st carrier side

  Hereinafter, a planetary gear device according to an example of an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a cross-sectional view of a planetary gear device 10 according to an example of an embodiment of the present invention.

  The planetary gear device 10 is an eccentric oscillating planetary gear device called a so-called sort type. The planetary gear device 10 includes two external gears 12 (planetary gears) that perform planetary motion, and an internal gear 14 that meshes with the external gears 12. The internal gear 14 is integrated with the casing 16. A first carrier 20 is disposed on one side of the external gear 12 in the axial direction, and a second carrier 30 connected to the first carrier 20 is disposed on the other side in the axial direction.

  A driven member of a counterpart machine (not shown) is connected to the first carrier 20 via a tap hole 21. The planetary gear device 10 is internally meshed with the internal gear 14 while the external gear 12 swings, and takes out the relative rotation of the external gear 12 and the internal gear 14 as an output from the first carrier 20 side. The driven member of the counterpart machine is driven.

  More specific description will be given below.

  The planetary gear device 10 includes a plurality of crankshafts 60 (three in this example: only one is shown in FIG. 1) for causing the external gear 12 to perform a planetary motion. A crankshaft gear 62 is connected to the crankshaft 60 via a spline 64. Each crankshaft gear 62 meshes with an input pinion 66 formed on a motor-side shaft (not shown). That is, the three crankshafts 60 can be rotated at the same speed in the same direction simultaneously by the rotation of the input pinion 66.

  The crankshaft 60 is integrally provided with two eccentric bodies 68 for causing the external gear 12 to perform a planetary motion. Each eccentric body 68 is formed of a cylinder having an axis C68 that is eccentric with respect to the axis C60 of the crankshaft 60 by an eccentricity e. The eccentric phase difference between the two eccentric bodies 68 is 180 degrees in this example (eccentric in a direction away from each other).

  The three crankshafts 60 have the same configuration, and the eccentric bodies 68 at the same position in the axial direction of each crankshaft 60 have the same eccentric phase. The external gear 12 is incorporated on the outer periphery of the eccentric body 68 via an eccentric body bearing 70.

  The external gear 12 is in mesh with the internal gear 14. The internal gear 14 is incorporated in an internal gear main body 14A integrated with the casing 16 and a pin groove 14B formed in the internal gear main body 14A, and constitutes internal teeth of the internal gear 14. 14C. The number of internal teeth of the internal gear 14 (the number of internal tooth pins 14C) is slightly larger (by 2 in this example) than the number of external teeth of the external gear 12. In addition, the casing 16 is being fixed to the fixing member of the other machine with the volt | bolt which is not illustrated through the connection hole 16A.

  As described above, the planetary gear device 10 is disposed on the one axial side of the external gear 12 and on the other axial side of the external gear 12, and is connected to the first carrier 20. The second carrier 30 is provided.

  In addition, the planetary gear device 10 includes a first main bearing 40 disposed between the first carrier 20 and the casing 16, and a second main bearing 50 disposed between the second carrier 30 and the casing 16. . The first main bearing 40 and the second main bearing 50 are incorporated in a back-to-back manner.

  The first main bearing 40 is an angular ball bearing. The first main bearing 40 includes a first rolling element 46 formed of a ball, a first inner ring 42 integrated with the first carrier 20, and a first outer ring 44 incorporated in the casing 16. . Since the first inner ring 42 is shared by the first carrier 20, the first inner ring rolling surface 42 </ b> A of the first inner ring 42 is directly formed on the outer periphery of the first carrier 20. The first outer ring rolling surface 44 </ b> A is formed on the inner periphery of the first outer ring 44.

  The second main bearing 50 is also composed of an angular ball bearing. The second main bearing 50 includes a second rolling element 56 formed of a ball, a second inner ring 52 integrated with the second carrier 30, and a second outer ring 54 incorporated in the casing 16. . Since the second inner ring 52 is also used by the second carrier 30, the second inner ring rolling surface 52 </ b> A of the second inner ring 52 is formed directly on the outer periphery of the second carrier 30. The second outer ring rolling surface 54 </ b> A is formed on the inner periphery of the second outer ring 54.

  In the present embodiment, the inner ring rolling surface of the main bearing refers to a surface on which the rolling elements can contact the inner ring (or a carrier when no independent inner ring is provided) in both the first and second main bearings. .

  In the planetary gear device 10, since the first rolling element 46 and the second rolling element 56 are configured by balls, the first inner ring rolling surface 42 </ b> A and the second inner ring rolling surface 52 </ b> A are the axes of the internal gear 14. In the cross section including the center C14 (the cross section in FIG. 1), both are formed by arcs. The axial range when the first inner ring rolling surface 42A is viewed from the radial direction is L42A, and the axial range when the second inner ring rolling surface 52A is viewed from the radial direction is L52A.

  Similarly, the outer ring rolling surface of the main bearing refers to a surface on which the rolling element can come into contact with the outer ring (a casing when there is no independent outer ring).

  In the planetary gear device 10, since the first rolling element 46 and the second rolling element 56 are formed of balls, the first outer ring rolling surface 44 </ b> A and the second outer ring rolling surface 54 </ b> A are the axes of the internal gear 14. In the cross section including the center C14, both are constituted by arcs. The axial range when the first outer ring rolling surface 44A is viewed from the radial direction is L44A, and the axial range when the second outer ring rolling surface 54A is viewed from the radial direction is L54A.

  The axial range when the first rolling element 46 of the first main bearing 40 is viewed from the radial direction is L46, and the axial range when the second rolling element 56 of the second main bearing 50 is viewed from the radial direction is L46. L56. This is equal to the diameter of the first and second rolling elements 46 and 56.

  The first carrier 20 has a first central through hole 22 at the radial center of the planetary gear device 10 (on the axis C14 of the internal gear 14). The first central through hole 22 penetrates the first carrier 20 in the axial direction. A closing cap 73 is put on the opening end of the first central through hole 22.

  In addition, the first carrier 20 has a first crankshaft through hole 26 into which the crankshaft 60 is fitted at a position offset by R26 from the axis C20 of the first carrier 20 in the radial direction. Since the planetary gear device 10 has three crankshafts 60, three first crankshaft through holes 26 are formed in the first carrier 20.

  The first crankshaft through hole 26 also penetrates the first carrier 20 in the axial direction. A first crankshaft bearing 71 is disposed between the first crankshaft through hole 26 and the crankshaft 60. The first crankshaft bearing 71 is configured by a cylindrical roller bearing. A closing cap 74 is also placed on the opening end of the first crankshaft through hole 26.

  On the other hand, the second carrier 30 has a second central through hole 32 in the radial center of the planetary gear device 10 (on the axis C14 of the internal gear 14). The second central through hole 32 penetrates the second carrier 30 in the axial direction.

  Further, the second carrier 30 has a second crankshaft through hole 36 into which the crankshaft 60 is fitted at a position corresponding to the first crankshaft through hole 26 (a position offset from the axis 30 of the second carrier 30). I have three. The second crankshaft through hole 36 penetrates the second carrier 30 in the axial direction. A second crankshaft bearing 72 is disposed between the second crankshaft through hole 36 and the crankshaft 60. The second crankshaft bearing 72 is configured by a cylindrical roller bearing.

  The external gear 12 has an external gear central through hole 12A on the axis C12, and a columnar hole 12B at a position offset from the axis C12A. First and second column portions 27 and 37 to be described later pass through the column hole 12B in a non-contact manner (with a gap). An oil seal 75 is disposed between the casing 16 and the first carrier 20.

  FIG. 2 is an exploded sectional view showing the first carrier 20, the second carrier 30, and the knock pin 80 of the planetary gear device 10.

  The first carrier 20 has a first column part 27 projecting toward the second carrier 30 and a first knock pin hole 28 opening in the tip end surface 27E of the first column part 27. The first knock pin hole 28 is a bottomed hole that does not penetrate the first carrier 20 in the axial direction. That is, the first knock pin hole 28 is formed from the distal end surface 27E of the first column part 27, and does not penetrate the first carrier 20 in the axial direction.

  In the present specification, the knock pin hole means a concept including a pilot hole for forming the knock pin hole. In other words, “the first knock pin hole 28 is a bottomed hole that does not penetrate the first carrier 20 in the axial direction” means that “the bottom hole bottom portion 28A of the first knock pin hole 28 is in the first carrier 20”. It means to exist.

  On the other hand, the second carrier 30 has a second knock pin hole 38 corresponding to the first knock pin hole 28. The second knock pin hole 38 opens on a surface 37 </ b> E facing the first carrier 20 (in the present planetary gear device 10, the tip surface of the second column portion 37 among them) 37 </ b> E.

  The second knock pin hole 38 is a bottomed hole that does not penetrate the second carrier 30 in the axial direction. That is, the second knock pin hole 38 is also formed from the surface 37E facing the front end surface 27E of the first carrier 20 of the second carrier 30, and does not penetrate the second carrier 30 in the axial direction (second knock pin hole 38). Is present in the second carrier 30).

  In the planetary gear device 10, the second carrier 30 has a second column part 37 protruding toward the first carrier 20, and the second knock pin hole 38 is formed on the tip surface 37 E of the second column part 37. It is open. The protruding length of the first pillar portion 27 from the axial end surface (other than the first pillar portion 27) of the first carrier 20 is L27. The protruding length of the second column portion 37 from the axial end surface (other than the second column portion 37) of the second carrier 30 is L37.

  In this planetary gear device 10, L27 = L37 is designed. That is, the front end surface 27E of the first column part 27 and the front end surface 37E of the second column part 37 are in contact with each other at the axial center of the first carrier 20 and the second carrier 30.

  Note that the second carrier does not necessarily have the second pillar portion as long as the second knock pin hole is formed of a bottomed hole that does not penetrate in the axial direction. Even when the second pillar portion is provided, it is not necessarily the same as the protruding length of the first pillar portion.

  In the planetary gear device 10, the axial thickness W <b> 20 of the first carrier 20 is formed thicker than the axial thickness W <b> 30 of the second carrier 30. This is because the first carrier 20 is formed with a tapped hole 21 for coupling with a driven member of a mating machine (not shown), so that the tapped hole 21, the first knock pin hole 28 and a connecting bolt 82 which will be described later. This is because of consideration not to interfere with the insertion hole (tap hole) 29.

  FIG. 3 is a side view of the second carrier 30 as viewed from the first carrier 20 side. FIG. 3 is a side view of the second carrier 30, but the side view of the first carrier 20 as viewed from the second carrier 30 side has substantially the same configuration. Therefore, in order to facilitate understanding, the corresponding reference numerals on the first carrier 20 side are described in parentheses, and the configuration on the first carrier 20 side is also described.

  Three first and second column portions 27 and 37 of the first and second carriers 20 and 30 are formed at equal intervals in the circumferential direction. The cross-sectional shape perpendicular to the axes of the first and second column portions 27 and 37 is an isosceles triangle. The bases 27F and 37F of the isosceles triangle are curved along the outer peripheries of the first and second carriers 20 and 30.

  The first and second insertion holes 29 and 39 of the connecting bolt 82 for connecting the first carrier 20 and the second carrier 30 have pitch circles with radii R29 and R39 in the vicinity of the base angles 27G and 37G of the isosceles triangle. Two pieces are formed on each of the pillar portions 27 and 37. The first and second knock pin holes 28, 38 are radially inward of the connection bolt 82 from the first and second insertion holes 29, 39 and in the vicinity of the apex angles 27H, 37H of the isosceles triangle, the radius R28. , One is formed in each column part 27, 37 by the pitch circle of R38.

  The inner diameter D28 of the first knock pin hole 28 is the same as the inner diameter D38 of the second knock pin hole 38. The axial position P38A (formation depth L38 from the tip surface 37E) of the pilot hole bottom 38A of the second knock pin hole 38 is the axial position P28A (formation from the tip surface 27E) of the pilot hole bottom 28A of the first knock pin hole 28. Depth L28).

  The formation positions of the first and second insertion holes 29 and 39 of the connecting bolt 82 for connecting the first carrier 20 and the second carrier 30 are the first insertion hole 29 on the first carrier 20 side and the second insertion position on the second carrier 30 side. The two insertion holes 39 correspond to each other. However, the first insertion hole 29 of the connection bolt 82 of the first carrier 20 is a bottomed tapped hole in which a screw is cut, and the second insertion hole 39 of the connection bolt 82 of the second carrier 30 is a straight through hole. It is. The connecting bolt 82 is inserted from the side opposite to the first carrier of the second carrier 30 and is screwed only with the first insertion hole (tap hole) 29 of the first carrier 20.

  The number and shape of the first and second column parts, the positions where the first and second knock pin holes and the connecting bolt are formed are not limited to the above-described configuration.

  In the planetary gear device 10, since the first and second carriers 20 and 30 have first and second pillar portions 27 and 37, the knock pin 80 includes the first and second main bearings 40 and 50. When viewed from the radial direction, a state of hardly overlapping is formed.

  More specifically, the first knock pin hole 28 does not overlap the first rolling element 46 when viewed from the radial direction. That is, the pilot hole bottom portion 28A (axial position P28A) of the first knock pin hole 28 is closer to the second carrier 30 side in the axial direction than the end portion 46A on the second carrier 30 side in the axial range L46 of the first rolling element 46. positioned.

  The second knock pin hole 38 does not overlap the second rolling element 56 when viewed from the radial direction. That is, the pilot hole bottom portion 38A (axial position P38A) of the second knock pin hole 38 is closer to the first carrier 20 side in the axial direction than the end portion 56A on the first carrier 20 side in the axial range L56 of the second rolling element 56. positioned.

  Further, in the planetary gear device 10, the first knock pin hole 28 does not overlap the first inner ring rolling surface 42A (the axial range L42A thereof) of the first main bearing 40 when viewed from the radial direction. When viewed from the radial direction, the second knock pin hole 38 does not overlap with the second inner ring rolling surface 52A (the axial range L52A thereof) of the second main bearing 50.

  In the planetary gear device 10, the first knock pin hole 28 does not overlap the first outer ring rolling surface 44 </ b> A (the axial range L <b> 44 </ b> A thereof) of the first main bearing 40. The second knock pin hole 38 does not overlap the second outer ring rolling surface 54A (the axial range L54A thereof) of the second main bearing 50.

  Next, the operation of the eccentric oscillating planetary gear device 10 according to the present embodiment will be described.

  First, the deceleration operation of the planetary gear device 10 will be described. When the input pinion 66 rotates, the three crankshaft gears 62 meshed simultaneously with the input pinion 66 rotate in the same direction at the same rotational speed.

  Since each crankshaft gear 62 is connected to the crankshaft 60 via the spline 64, the three crankshafts 60 rotate at the same rotational speed in the same direction. As a result, the eccentric bodies 68 respectively formed at the same position in the axial direction of each crankshaft 60 rotate in synchronization. As a result, the two external gears 12 oscillate with an eccentric phase difference of 180 degrees via the eccentric body bearing 70.

  Each external gear 12 is in mesh with the internal gear 14. For this reason, every time each external gear 12 swings once, the external gear 12 is shifted in the circumferential direction by a difference in the number of teeth (two teeth in this embodiment) with respect to the internal gear 14. (Rotate). The rotation of the external gear 12 is transmitted to the first carrier 20 and the second carrier 30 through a pair of crankshaft bearings 71 and 72 as a revolution around the axis C14 of the internal gear 14 of each crankshaft 60. Is done. As a result, the counterpart machine (driven member) connected to the first carrier 20 can be rotated relative to the casing 16.

  Next, the operation related to the connection of the first carrier 20 and the second carrier 30 will be described.

  In the planetary gear device 10, in order to connect the first carrier 20 and the second carrier 30, first, the knock pin 80 is inserted into the first knock pin hole 28 opened in the front end surface 27 </ b> E of the first column portion 27 of the first carrier 20. Next, the knock pin 80 is engaged with the second knock pin hole 38 opened at the tip end surface 37E of the second column portion 37 of the second carrier 30 and the entire second carrier 30 is fitted into the protruding knock pin 80. To be included. Thereby, the 1st carrier 20 and the 2nd carrier 30 can be positioned mutually.

  This positioning procedure may be reversed. That is, the knock pin 80 is driven into the second knock pin hole 38 opened in the distal end surface 37E of the second column portion 37 of the second carrier 30, and then the distal end of the first column portion 27 of the first carrier 20 is inserted into the knock pin 80. The first knock pin hole 28 opened in the surface 27E may be engaged, and the entire first carrier 20 may be fitted into the protruding knock pin 80.

  After positioning the first carrier 20 and the second carrier 30 in this way, the first carrier 20 and the second carrier 30 are connected and fixed by the connecting bolt 82 inserted from the second carrier 30 side.

  The conventional planetary gear device employs a structure in which a knock pin hole is formed through the second carrier in the axial direction. The inventors considered that this structure may be one of the main factors that reduce the life of the main bearing. As a result of many experiments, this structure is actually one of the causes of the decrease in rigidity of the second carrier. When the rigidity of the second carrier decreases, the roundness of the second main bearing deteriorates, It was confirmed that a load different from the original power transmission load was generated in the second main bearing.

  Based on such verification, the planetary gear device 10 uses the first knock pin hole 28 as a bottomed hole that opens to the front end surface 27E of the first pillar portion 27 protruding toward the second carrier 30, and The two knock pin holes 38 are bottomed holes that open to a surface 37E of the second carrier 30 that faces the front end surface 27E of the first carrier 20. That is, both the first knock pin hole 28 and the second knock pin hole 38 are formed from the mutually opposing surfaces (tip surfaces 27E, 37E) of the first and second carriers 20, 30, and the first and second carriers 20, 30 is a bottomed hole that does not penetrate in the axial direction.

  Thereby, in particular, the rigidity of the second carrier 30 can be maintained higher, and as a result, the roundness of the second main bearing 50 can be maintained higher, and the life of the second main bearing 50 is improved. be able to. In addition, since the roundness of the second main bearing 50 can be maintained high, the rotation of the second carrier 30 can be made smoother, driving noise and driving vibration can be reduced, and power loss can also be reduced.

  In addition, since the second main bearing 50 on the second carrier 30 side is more smoothly supported, the life of the first main bearing 40 on the first carrier 20 side can be further improved.

  In the course of this experiment and verification, the inventors have not only made the knock pin hole not penetrate the carrier, but preferably from the radial direction, in order to keep the rigidity of the carrier higher. When viewed, the knock pin hole does not overlap the rolling element of the main bearing, more preferably, it does not overlap the inner ring rolling surface that directly receives the reaction force from the rolling element, and more preferably the inner ring rolling surface. It was confirmed that it is more effective that it does not overlap with both the outer ring rolling surface and the outer ring rolling surface.

  Based on this viewpoint, the planetary gear device 10 has the first carrier 20 having the first pillar portion 27, and the first knock pin hole 28 overlaps the first rolling element 46 when viewed from the radial direction. The first inner ring rolling surface 42A does not overlap, and the first outer ring rolling surface 44A does not overlap. Further, the second carrier 30 has a second column portion 37, and the second knock pin hole 38 does not overlap the second rolling element 56 when viewed from the radial direction, and the second inner ring rolling surface 52A. And the second outer ring rolling surface 54A does not overlap.

  As a result, the planetary gear device 10 can substantially avoid the decrease in rigidity of the first and second carriers 20 and 30 due to the formation of the first and second knock pin holes 28 and 38 after all. Yes. The inventors can actually maintain higher roundness of the first and second inner ring rolling surfaces 42A and 52A of the first and second main bearings 40 and 50 by these configurations. It has been confirmed that smooth bearing operation is possible.

  In the above embodiment, the planetary gear device is provided with a plurality of crankshafts at positions offset from the shaft center of the internal gear, and the eccentric gear that swings the external gear when the plurality of crankshafts rotate synchronously. An oscillating planetary gear unit has been shown. However, the eccentric oscillating planetary gear device is of a so-called center crankshaft type in which a single crankshaft is provided at the axial center position of the internal gear, and the external gear is oscillated by the single crankshaft. Planetary gear devices are also known. The present invention can be applied to the planetary gear device having such a configuration, and the same operational effects can be obtained.

  Furthermore, the present invention can also be applied to a simple planetary gear device having first and second carriers on one side and the other side of the planetary gear in the same manner, and the same operational effects can be obtained.

10 ... Planetary gear unit 12 ... External gear (planetary gear)
DESCRIPTION OF SYMBOLS 14 ... Internal gear 16 ... Casing 20 ... 1st carrier 27 ... 1st pillar part 27E ... End face 28 ... 1st knock pin hole 28A ... Bottom hole bottom part 30 ... 2nd carrier 37 ... 2nd pillar part 37E ... End face 38 2nd knock pin hole 38A ... Bottom of bottom hole 40 ... 1st main bearing 50 ... 2nd main bearing 60 ... Crankshaft

Claims (4)

A planetary gear, an internal gear meshing with the planetary gear, a casing integrated with the internal gear, a first carrier disposed on one axial side of the planetary gear, and an axial direction of the planetary gear A second carrier disposed on the other side and connected to the first carrier; a first main bearing disposed between the first carrier and the casing; and disposed between the second carrier and the casing. A planetary gear device comprising a second main bearing,
The first carrier has a first pillar portion projecting toward the second carrier, and a first knock pin hole that opens at a front end surface of the first pillar portion,
The second carrier has a second knock pin hole that opens to a surface facing the first carrier and corresponds to the first knock pin hole;
The first knock pin hole is a bottomed hole that does not penetrate the first carrier in the axial direction;
The planetary gear device, wherein the second knock pin hole is a bottomed hole that does not penetrate the second carrier in the axial direction. In claim 1,
The first main bearing has a first rolling element,
The second main bearing has a second rolling element,
The first knock pin hole does not overlap the first rolling element when viewed from the radial direction,
The planetary gear device, wherein the second knock pin hole does not overlap the second rolling element when viewed from the radial direction. In claim 1 or 2,
The first main bearing has a first inner ring rolling surface,
The second main bearing has a second inner ring rolling surface,
The first knock pin hole does not overlap the first inner ring rolling surface when viewed from the radial direction,
The planetary gear device, wherein the second knock pin hole does not overlap the second inner ring rolling surface when viewed from the radial direction. In any one of Claims 1-3,
The second carrier has a second pillar portion protruding toward the first carrier,
The planetary gear device, wherein the second knock pin hole is opened at a front end surface of the second pillar portion.

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