JP6175696B2 - Planetary gear mechanism, transmission, and carrier manufacturing method - Google Patents

Description

  The present invention relates to a planetary gear mechanism, a transmission including the planetary gear mechanism, and a method for manufacturing a carrier constituting the planetary gear mechanism.

  As described in Patent Document 1, in a planetary gear mechanism used in an automatic transmission, lubricating oil discharged from a center shaft is sent to the outside in the radial direction using centrifugal force.

JP 2005-155868 A

  The planetary gear mechanism described in Patent Literature 1 has a single plate support (cover) that supports a plurality of pinions (pinion gears) on a carrier plate (plate). A plate support part has a wall part between the pinions adjacent to the circumferential direction. For this reason, even if the lubricating oil is discharged from the center shaft side, the lubricating oil is prevented from being sent to the outer peripheral side, and sufficient lubrication may not be possible.

  The present invention has been made in view of such problems, and in a planetary gear mechanism having a cover for supporting a pinion gear on a plate, a planetary gear mechanism capable of efficiently performing lubrication even when lubricating oil is discharged from a center shaft is provided. The purpose is to do.

  According to an aspect of the present invention, the carrier has at least a first pinion gear and a second pinion gear, and the carrier has at least a plate, a first cover, and a second cover. The first cover has at least a first upper surface portion and a pair of first feet, and the second cover has a second upper surface portion and a pair of second feet. The pair of first legs extends from the first upper surface toward the plate, and the pair of second legs respectively extends from the second upper surface toward the plate. The first pinion gear is supported between the first upper surface portion and the plate, the second pinion gear is supported between the second upper surface portion and the plate, and the first pinion gear is a pair of The second pinion gear, which is located between the first feet, has a pair of second feet The first cover and the second cover are disposed along the rotation direction of the carrier, and the first cover and the second cover are separated from each other. .

  According to the above aspect, since the first cover and the second cover that support the first pinion gear and the second pinion gear are separated from each other, the lubricating oil is guided radially outward in the separated space. Therefore, the planetary gear mechanism can be efficiently lubricated.

It is a front view of the carrier of the planetary gear mechanism of the embodiment of the present invention. It is II-II sectional drawing of the carrier of the planetary gear mechanism of embodiment of this invention. It is III-III sectional drawing in a transmission provided with the planetary gear mechanism of embodiment of this invention. It is IV-IV sectional drawing in a transmission provided with the planetary gear mechanism of embodiment of this invention. It is explanatory drawing of the manufacturing method of the carrier of the planetary gear mechanism of embodiment of this invention. It is a front view of the modification of the carrier of the planetary gear mechanism of embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIGS. 1 to 4 are views for explaining the planetary gear mechanism 1 according to the embodiment of the present invention, and are front views when the carrier 30 of the planetary gear mechanism 1 is observed from the rotation axis direction.

  For example, the planetary gear mechanism 1 includes a sun gear 10, a pinion gear 20, a carrier 30, and a ring gear 40 (see FIG. 3).

  The carrier 30 outputs the revolution rotation of the pinion gear 20 that rotates on the outer periphery of the sun gear 10.

  FIG. 1 is a front view when the carrier 30 of the planetary gear mechanism 1 according to the embodiment of the present invention is observed from the direction of the rotation axis.

  The carrier 30 includes a plurality of pinion gears 20 in the circumferential direction (the rotation direction of the carrier 30).

  The carrier 30 includes a substantially disc-shaped plate 31 and a cover 33 that supports the pinion gear 20 to be rotatable with respect to the plate 31.

  In the example shown in FIG. 1, three pinion gears 20 are provided at equal intervals (120 ° intervals) in the circumferential direction.

  FIG. 2 is an explanatory diagram of the carrier 30 of the planetary gear mechanism 1 according to the embodiment of the present invention, and shows a cross-sectional view taken along the line II-II in FIG.

  The carrier 30 is configured by arranging a plurality of covers 33 on the plate 31 along the rotation direction of the carrier 30.

  The cover 33 is composed of a flat plate-like upper surface portion 33 a that is arranged apart from the plate, and a pair of feet 34 and 35 that are bent from both ends of the upper surface portion 33 a to the plate 31 side and fixed to the plate 31. Become.

  A through hole 33b for penetrating and supporting the rotating shaft 22 of the pinion gear 20 is formed in the upper surface portion 33a.

  The pinion gear 20 is rotatably supported by rotating shafts 22 fixed to a through hole 33b in the upper surface portion 33a of the cover 33 and a through hole 31b formed in the plate 31 so as to face the through hole 33b. Is done.

  The leg portions 34 and 35 are bent in a direction substantially parallel to the surface direction of the plate 31 from the upright portions 34a and 35a extending from the upper surface portion 33a toward the plate side. It consists of the joint parts 34b and 35b joined to the upper surface.

  The cover 33 is fixed to the plate 31 by joining the joint portions 34b and 35b of the foot portions 34 and 35 to the plate 31 by welding, for example.

  With the cover 33 fixed to the plate 31, the pinion gear 20 is supported between the upper surface portion 33 a and the upper surface of the plate 31.

  As shown in FIG. 1, the legs 34 and 35 are fixed to the plate 31, and are on the radial segment from the center of the plate 31 to the outside in the radial direction (direction from the center of the plate 31 to the outer periphery). Located in.

  In other words, the pair of feet 34 and 35 are symmetrical with respect to a line connecting the center of the plate 31 and the center of the through hole 33b, and are arranged so that the distance increases as it goes to the outer side (outer periphery) in the radial direction of the plate 31. Is done.

  3 and 4 are explanatory views of a transmission including the planetary gear mechanism 1 of the present embodiment.

  3 is an enlarged view of the cross-sectional view taken along the line III-III in FIG. 1 and FIG. 4 is an enlarged view of the cross-sectional view taken along the line IV-IV in FIG.

  The transmission 100 is configured by housing the planetary gear mechanism 1, the friction engagement mechanism 120, and the friction engagement mechanism 140 in a case 110.

  The case 110 is formed with a support portion 150 that supports the center shaft 12 and rotatably supports the sun gear 10.

  A plate 31 constituting a carrier 30 is splined to the center shaft 12.

  The sun gear 10 is fitted to the support portion 150 of the case 110 and is supported rotatably by the bearing 155 with respect to the case 110.

  The sun gear 10 is supported with respect to the carrier 30 via a bearing 160.

  The sun gear 10 meshes with a pinion gear 20 provided in the carrier 30.

  The pinion gears 20 mesh with the ring gear 40 on the outer peripheral side.

  The ring gear 40 is formed with an extending portion 41 extending in an annular shape toward the center shaft 12 side (inner peripheral side). The extending portion 41 and the carrier 30 are supported by a bearing 42 on the opposite side of the sun gear 10 with the plate 31 interposed therebetween.

  The outer peripheral side of the extending portion 41 of the ring gear 40 extends to the case 110 side, and the friction fastening mechanism 140 is provided on the outer peripheral side of the extending portion 41.

  The frictional engagement mechanism 140 stops the relative rotation between the case 110 and the ring gear 40.

  The sun gear 10 is formed with an extending portion 13 that extends in a cylindrical shape to the outer peripheral side while avoiding the carrier 30 and the pinion gear 20.

  A friction fastening mechanism 120 is provided on the outer peripheral side of the extending portion 13.

  The friction fastening mechanism 120 stops the relative rotation between the case 110 and the sun gear 10.

  With such a configuration, the transmission 100 can change the gear ratio of the transmission 100 by selectively locking one of the friction engagement mechanism 120 and the friction engagement mechanism 140.

  The center shaft 12 is formed as a hollow structure, and a lubricating oil supply pipe 19 that supplies lubricating oil to the planetary gear mechanism 1, the friction fastening mechanism 120, and the friction fastening mechanism 140 is formed.

  Lubricating oil in the lubricating oil supply pipe 19 of the center shaft 12 is discharged from the lubricating oil supply hole 12 a into the case 110 by centrifugal force due to rotation of the center shaft 12.

  The lubricating oil released from the lubricating oil supply hole 12 a into the case 110 passes through the bearing 160 of the sun gear 10 and the like around the pinion gear 20 due to the centrifugal force generated by the rotation of the planetary gear mechanism 1.

  A cover 33 that supports the pinion gear 20 exists around the pinion gear 20, but the adjacent cover 33 and the cover 33 are separated from each other.

  With such a configuration, the lubricating oil released to the periphery of the pinion gear 20 is released to the ring gear 40 and its outer periphery without being obstructed by the cover 33, and lubricates them.

  The lubricating oil is also released to the frictional fastening mechanism 120 and the frictional fastening mechanism 140 provided on the outer peripheral side of the ring gear 40 by centrifugal force, and lubricates them.

  Thus, in the planetary gear mechanism 1 of the present embodiment, the cover 33 that supports the pinion gear 20 is separated from the adjacent cover 33, and a gap (lubricating oil flow path) through which the lubricating oil flows is formed. Lubricating oil is supplied to the outer periphery.

  Next, a method for manufacturing the carrier 30 of the planetary gear mechanism 1 of the present embodiment will be described.

  As described above, the carrier 30 includes the substantially disc-shaped plate 31 and the cover 33 that rotatably supports the pinion gear 20 with respect to the plate 31.

  As shown in FIG. 2, the cover 33 includes a flat plate-like upper surface portion 33a and a pair of foot portions 34 and 35 provided on both ends of the upper surface portion 33a.

  The leg portions 34 and 35 are upright portions 34a and 35a bent from the upper surface portion 33a toward the plate side, and the upright portions 34a and 35a are bent in a direction substantially parallel to the surface of the plate 31, and It consists of the joining parts 34b and 35b to join.

  The cover 33 bends a flat metal plate with a press or the like, and shapes the upright portions 34a and 35a and the joint portions 34b and 35b.

  Since the cover 33 is joined to the upper surface of the plate 31 at the joint portions 34b and 35b, the angle between the upper surface portion 33a and the upright portions 34a and 35a and the angle between the upright portions 34a and 35a and the joint portions 34b and 35b are respectively It is desirable to form at right angles.

  On the other hand, since the spring back is generated in the bending process of the metal plate, it is difficult to bend at a right angle by a single process, and if it is bent at an acute angle in consideration of the spring back, an undercut occurs and the press process becomes complicated.

  Therefore, when the bent portion is formed at a right angle, a plurality of steps such as further adjustment after the press are generated, which increases the cost.

  Therefore, the cover 33 of the present embodiment does not set the angle between the upper surface portion 33a and the upright portions 34a and 35a and the angle between the upright portions 34a and 35a and the joint portions 34b and 35b to be 90 °, but forms each obtuse angle.

  More specifically, pressing is performed so that these angles are obtuse angles of less than 90 degrees with each other in consideration of springback.

  If the angle between the upper surface portion 33a and the upright portions 34a, 35a and the angle between the upright portions 34a, 35a and the joint portions 34b, 35b are substantially the same angle, the upper surface portion 33a and the upper surface of the plate 31 are in parallel. And the joining parts 34b and 35b and the upper surface of the plate 31 become parallel.

  The angle θ between the upright portions 34a and 35a and the angle θ between the upright portions 34a and 35a and the joint portions 34b and 35b are, for example, 90 degrees <θ ≦ 95 degrees.

  By comprising in this way, joining part 34b, 35b and the upper surface of the plate 31 become parallel by one press work, and joining of the cover 33 and a plate is made easy, suppressing the raise in the cost in a press process. Can do.

  Next, joining of the cover 33 and the plate 31 will be described.

  FIG. 5 is a diagram illustrating a method for manufacturing the carrier 30 of the planetary gear mechanism 1 according to the embodiment of the present invention, and is a diagram illustrating a method for joining the cover 33 to the plate 31.

  The cover 33 is joined to a predetermined position of the plate 31 by, for example, laser welding.

  As described above, the legs 34 and 35 of the cover 33 are located on the line segment of the radius from the center of the plate 31 toward the radially outer side.

  Therefore, by moving the laser welding apparatus in the radial direction of the plate 31 with the cover 33 disposed on the plate 31, the joint portions 34 b and 35 b of the feet 34 and 35 of the cover 33 are laser welded to the plate 31. To do.

  At this time, since the adjacent cover 33 is separated and there is a space as a lubricating oil flow path, the joining portions 34b and 35b are moved by moving the laser welding apparatus two-dimensionally in the radial direction of the plate 31. Can be welded.

  Further, the legs 34 and 35 of the plurality of covers 33 arranged on the plate 31 are all located on a line segment of the radius from the center of the plate 31 toward the radially outer side.

  Therefore, by moving the laser welding device in the radial direction of the plate 31 with respect to the two legs 34 and 35 positioned symmetrically from the center of the plate 31, after welding one leg 34, the other leg The part 35 is welded.

  That is, since the two legs 34 and 35 can be welded during a single operation of moving the laser welding apparatus two-dimensionally, the process in manufacturing the carrier 30 can be reduced and the cost can be reduced.

  After joining the cover 33 to the plate 31 in this way, the pinion gear 20 is assembled from the outer periphery of each cover 33.

  As described above, since the legs 34 and 35 of the cover 33 are arranged so as to be separated toward the outer periphery, the pinion gear 20 can be easily assembled from the outer peripheral side of the cover 33, and the ease of assembly in the production of the carrier is facilitated. improves.

  Next, a modification of this embodiment will be described.

  FIG. 6 is a view for explaining a modification of the planetary gear mechanism 1 according to the embodiment of the present invention, and is a front view when the carrier 30 of the planetary gear mechanism 1 is observed from the rotation axis direction.

  In the modification shown in FIG. 6, the upright portions 34a and 35a of the legs 34 and 35 of the cover 33 are symmetric with respect to the line connecting the center of the cover 33 and the center of the through hole 33b, and are radially outward of the plate 31. It was arranged so that the distance approached as it went to.

  By configuring the legs 34 and 35 of the cover 33 in this way, the lubricating oil supplied from the center shaft 12 is easily collected in the pinion gear 20 by the upright portions 34a and 35a.

  With such a configuration, the pinion gear 20 can be efficiently lubricated.

  Also in the modified example configured as shown in FIG. 6, since the cover 33 supporting the pinion gear 20 is separated from the adjacent cover 33 as described above, a gap (lubricating oil flow path) through which the lubricating oil flows is formed. The lubricating oil is easily supplied to the outer periphery through the carrier 30.

  Further, in the modified example configured as shown in FIG. 6, the laser welding apparatus can be moved two-dimensionally to weld the two legs 34 and 35 during one operation. The process can be reduced and the cost can be reduced.

  As described above, in the planetary gear mechanism 1 according to the embodiment of the present invention, the carrier 30 includes the plate 31 and the plurality of covers 33 that are joined to the plate 31 and rotatably support the pinion gear 20.

  Here, the covers 33 arranged adjacent to each other on the plate 31 are referred to as a first cover 33A and a second cover 33B.

  The first cover 33A has an upper surface portion 33a and a pair of foot portions 34 and 35, and the second cover 33B has an upper surface portion 33a and a pair of foot portions 34 and 35.

  The pinion gear 20 is sandwiched between the upper surface portion 33a of the first cover 33A and the plate 31, and is sandwiched between the upper surface portion 33a of the second cover 33B and the plate 31.

  The pinion gear 20 is located between the pair of legs 34 and 35.

  The first cover 33A and the second cover 33B are arranged along the rotation direction of the carrier 30, and the first cover 33A and the second cover 33B are separated from each other.

  With such a configuration, the first cover 33A and the second cover 33B supporting the pinion gear 20 are separated from each other. For example, when lubricating oil is supplied from around the center of the carrier, the rotation of the carrier 30 is performed. Since the lubricating oil is guided radially outward in the space separated by the centrifugal force, the planetary gear mechanism 1 and the frictional engagement mechanisms 120 and 140 can be efficiently lubricated.

  Since the carrier 30 supports the single pinion gear 20 with the single cover 33, the bending rigidity against the force input to the pinion gear 20 is stronger than when the plurality of pinion gears 20 are fixed to the plate 31 with the single cover. can do. These effects correspond to claims 1 and 5.

  The pair of legs 34 and 35 of the first cover 33 </ b> A and the second cover 33 </ b> B are arranged so that the distance increases as it goes outward in the radial direction of the plate 31.

  With such a configuration, it becomes easy to assemble the pinion gear 20 from the outer periphery of each of the first cover 33A and the second cover 33B, and the ease of assembling in manufacturing the carrier is improved. This effect corresponds to claim 2.

  The pair of legs 34 and 35 of the first cover 33A and the second cover 33B may be arranged so that the distance is closer toward the outer side in the radial direction of the plate 31 (FIG. 6).

  With such a configuration, the lubricating oil supplied from the center shaft 12 is easily collected in the pinion gear 20 by the upright portions 34a and 35a, and the pinion gear 20 can be lubricated efficiently. This effect corresponds to the third aspect.

  In the first cover 33A and the second cover 33B, the angle between the upper surface portion 33a and the upright portions 34a and 35a and the angle between the upright portions 34a and 35a and the joint portions 34b and 35b are formed at an obtuse angle.

  With such a configuration, the joining portions 34b and 35b and the upper surface of the plate 31 are parallel to each other by a single press process, and the joining of the cover 33 and the plate can be facilitated while suppressing an increase in cost in the pressing process. . This effect corresponds to claim 4.

  When joining the first cover 33 </ b> A and the second cover 33 </ b> B to the plate, a laser welding device, which is a joining device, is attached to the two foot portions 34, 35 symmetrically located from the center of the plate 31. By moving in the radial direction, after welding one foot 34, the other foot 35 is welded.

  With such a manufacturing method, since the two legs 34 and 35 can be welded during one operation of moving the joining device two-dimensionally, it is possible to reduce the manufacturing process of the carrier 30 and reduce the cost. it can. This effect corresponds to the sixth aspect.

  The embodiment of the present invention has been described above, but the above embodiment is merely a part of an application example of the present invention, and the technical scope of the present invention is limited to the specific configuration of the above embodiment. is not.

  In the present embodiment, the carrier 30 provided with the three covers 33 and the three pinion gears 20 on the plate 31 has been described as an example. However, the present invention is not limited to this, and the four or more pinion gears 20 are formed by the four or more covers 33. The structure which supports may be sufficient.

  Even in such a configuration, it is only necessary to prepare a plurality of the same parts for the cover 33. Therefore, even when the number of pinion gears 20 is changed by a design change, a cover corresponding to the number of pinion gears 20 is individually manufactured. Therefore, the cost of the planetary gear mechanism 1 can be reduced.

  Although the laser welding apparatus has been described as an example in the present embodiment, the plate 31 and the cover 33 may be joined by electric welding, gas welding, or friction joining.

DESCRIPTION OF SYMBOLS 1 Planetary gear mechanism 10 Sun gear 12 Center shaft 12a Lubricating oil supply hole 13 Flange part 20 Pinion gear 22 Rotating shaft 30 Carrier 31 Plate 33 Cover 33a Upper surface part 34, 35 Foot part 34a, 35a Upright part 34b, 35b Joint part 40 Ring gear 41 Flange Part 100 Transmission 110 Case 120 Friction fastening mechanism 140 Friction fastening mechanism

Claims (6)

Having at least a carrier, a first pinion gear, and a second pinion gear;
The carrier has at least a plate, a first cover, and a second cover,
The first cover has at least a first upper surface portion and a pair of first feet,
The second cover has at least a second upper surface portion and a pair of second feet,
Each of the pair of first legs extends from the first upper surface toward the plate,
Each of the pair of second legs extends from the second upper surface toward the plate,
The first pinion gear is supported between the first upper surface portion and the plate,
The second pinion gear is supported between the second upper surface portion and the plate,
The first pinion gear is located between a pair of the first legs,
The second pinion gear is located between the pair of second legs,
The first cover and the second cover are arranged along a rotation direction of the carrier,
The planetary gear mechanism, wherein the first cover and the second cover are separated from each other. The planetary gear mechanism according to claim 1,
The pair of first feet are arranged such that the distance from each other increases toward the outer periphery,
A pair of said 2nd leg part is arrange | positioned so that a mutual distance may leave | separate, so that it goes to an outer periphery. The planetary gear mechanism according to claim 1,
The pair of first legs are arranged such that the distance between them approaches closer to the outer periphery,
A pair of said 2nd leg part is arrange | positioned so that a mutual distance may approach as it goes to an outer periphery, The planetary gear mechanism characterized by the above-mentioned. The planetary gear mechanism according to any one of claims 1 to 3,
Each of the pair of first legs is formed from each of the set of first upright portions bent from the first upper surface portion to the plate side and the set of first upright portions. A set of first joints folded substantially parallel to the surface of the plate,
Each of the pair of second legs is formed from each of the pair of second upright parts bent from the second upper surface part to the plate side, and the pair of second upright parts. A set of second joints folded substantially parallel to the surface of the plate,
The bending angle between the first upper surface portion and the set of the first upright portions and the bending angle between the set of the first upright portions and the set of the first joint portions are both obtuse angles. And
The bending angle between the second upper surface portion and the set of the second upright portions, and the bending angle between the set of the second upright portions and the set of the second joint portions are both obtuse angles. A planetary gear mechanism characterized in that The planetary gear mechanism according to any one of claims 1 to 4,
A friction fastening mechanism for locking rotation of at least one of a sun gear meshing with the first and second pinion gears and a ring gear meshing with the first and second pinion gears;
A transmission comprising: A first step of placing the first cover and the second cover on the plate;
A second step of joining the first cover and the second cover to the plate by a joining device;
The first cover has at least a first upper surface portion and a pair of first feet,
The second cover has at least a second upper surface portion and a pair of second feet,
Each of the pair of first legs extends from the first upper surface toward the plate,
Each of the pair of second legs extends from the second upper surface toward the plate,
In the second step, the joining device is linearly moved with respect to the plate, thereby joining one of the pair of first feet and the plate, and a pair of the second A method for manufacturing a carrier, comprising joining one of the legs to the plate.

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