JP3180279B2 - Double planetary carrier - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double planetary carrier for carrying two sets of planetary gears spaced apart in the axial direction.

[0002]

2. Description of the Related Art Conventionally, as this type of carrier, according to Japanese Utility Model Laid-Open Publication No. Sho 62-121451, three side plates are arranged at intervals in the axial direction, and these side plates are interposed between the side plates. 2. Description of the Related Art There is known a structure in which planetary gears are integrally connected to each other via a piece, and are respectively supported between an intermediate side plate and axially outer side plates.

[0003]

In a conventional planetary carrier carrying one set of planetary gears, after inserting the planetary gears between a pair of side plates connected via a strip, the gears are pivotally supported. The gear shaft is assembled so as to straddle both side plates, and then the both ends of the gear shaft are crimped to fix the gear shaft to the carrier, thereby assembling the carrier assembly. However, in the double planetary carrier in which the three side plates are integrally connected as in the above-described conventional example, the fitting end of the gear shaft with respect to the intermediate side plate cannot be swaged, and therefore, the gear shaft with respect to the outer side plate. The gear shaft must be fixed to the carrier by welding the fitting end of the gear shaft to the side plate, and the welding of the gear shaft is troublesome, resulting in poor productivity.
In order to solve such a problem, two carriers having a pair of side plates connected via a strip are provided, and each carrier carries a planetary gear, and the carriers are connected to form a double planetary carrier. However, in this case, how to ensure the relative positional accuracy of the two sets of planetary gears is a problem. That is, in the carrier of the conventional example, since the gear shafts of the two sets of planetary gears are fitted to the intermediate side plates, the relative positional accuracy of the two sets of planetary gears with respect to the intermediate side plates is secured.
When two sets of planetary gears are carried on different carriers, it is difficult to ensure the relative positional accuracy of the two sets of planetary gears due to manufacturing tolerances of the respective carriers, positioning tolerances when connecting the carriers, and the like. .

[0004] In view of the above, the present invention provides a double planetary carrier in which two sets of planetary gears are carried on different carriers and the relative positional accuracy of the two sets of planetary gears can be ensured. That is the purpose.

[0005]

In order to achieve the above object,
The present invention relates to a double planetary carrier that carries two sets of planetary gears separated in the axial direction, and is formed by connecting a pair of side plates facing each other with a planetary gear on one side in the axial direction interposed therebetween. A first carrier and a second carrier formed by connecting a pair of side plates facing each other across a planetary gear on the other side in the axial direction via a spacer; A cylindrical portion for receiving the other side plate is formed on the outer periphery of one side plate with the side plate of the two carriers, and serration teeth which engage with play with each other are formed on the cylindrical portion and the outer periphery of the other side plate, The two carriers are serrated and the play causes the two carriers to move radially.
The two sets of planetary gears can be relatively displaced.
When the two sets of planetary gears are
The gear is automatically aligned with the gear .

[0006]

In order to function as a double planetary carrier, it is necessary to surely transmit the torque between the first and second carriers. This requirement is achieved by serration engagement of both carriers. And, since there is play in the serration engaging portion, when two sets of planetary gears mesh with the sun gear, both carriers move relatively in the radial direction, and the two sets of planetary gears are automatically aligned with the sun gear. And the relative positional accuracy of the two sets of planetary gears is ensured.

[0007]

1 to 3, reference numeral 1 denotes a double planetary carrier, on which two sets of planetary gears 2, 3 which are separated in the axial direction are carried. The carrier 1 is configured by connecting a first carrier 4 carrying four planetary gears 2 on one side in the axial direction and a second carrier 5 carrying four pairs of dual planetary gears 3 on the other side in the axial direction. The two planetary gears 2 and 3 are engaged with sun gears S ₁ and S ₂ on a common sun gear shaft S, and the ring gears R ₁ and R ₂ are respectively engaged with each other to form a planetary gear mechanism. The output is taken out through the hub 6 attached to the carrier 5.

Each of the first and second carriers 4 and 5 has axially inner side plates 41 and 51 and axially outer side plates 42 and 52, and is bent at a plurality of locations around the outer side plates 42 and 52. Each of the carriers 4, 5 is manufactured by welding the tips of the pieces 43, 53 extending inward in the axial direction to the inner side plates 41, 51.
In the first carrier 4, a plurality of engaging holes 44 are formed in the inner side plate 41, and the tips of the spacers 43 are inserted into the respective holes 44 and welded. In the second carrier 5, A plurality of coined seating surfaces 54 were formed on the back surface of the inner side plate 51, and the tips of the spacers 53 were abutted on the respective seating surfaces 54 and welded. After the carriers 4 and 5 are manufactured as described above, the planetary gears 2 and 3 are inserted between both side plates of the carriers 4 and 5 with the washers 21 and 31 attached to both ends thereof. After assembling the gear shafts 23 and 33 penetrating through the needle bearings 22 and 32 mounted on the inner circumferences of the two and three so as to straddle both side plates, the gear shafts 23 and 33 are caulked at both ends and the respective carriers 4, 5 And assemble the carrier assembly. A cylindrical portion 5 for receiving the inner side plate 41 of the first carrier 4 facing the side plate 51 is provided on the outer periphery of the side plate 51 inside the second carrier 5.
1a, and the outer periphery of the side plate 41 and the cylindrical portion 51a are formed.
In this case, serration teeth 45 and 55 are formed outwardly and inwardly, so that the first and second carriers 4 and 5 are serrated and engaged. In addition, as shown in FIGS. 4 and 5, at a plurality of locations around the back surface of the side plate 41 of the first carrier 4, concave grooves 46 located at the toothed portions of the serration teeth 45 are provided.
To form a, the serration <br/> Deployment axial tip portion of the radially inner side of tooth valleys of the teeth 55 in the circumferential囲複several positions of the cylindrical portion 51a
The carrier is bent, and the bent portion 56 is engaged with the concave groove portion 46 so that the two carriers 4 and 5 are fixedly connected in the axial direction, thereby forming the double planetary carrier 1. The cylindrical portion 51a is formed so as to protrude behind the side plate 41, and a circlip engaging with the back surface of the side plate 41 is attached to the inner periphery of the protruding portion, and the two carriers 4, 5 are axially moved. They may be connected.

Here, the serration teeth 45, 55
, As shown in FIG. 4, it is formed to engage with presence play each other, therefore, when to mesh with two sets of planetary gears 2 and 3 to the sun gear S _1, S _2, both carriers 4, 5 relatively moves, and two planetary gears 2, 3
Are automatically aligned with sun gears S ₁ and S ₂ .

Further, the inner side plates 4 of the carriers 4 and 5 are provided.
1 and 51, a rubber oil plate 7 having a plurality of oil grooves 71 as shown in FIG. 6 is interposed, and lubricating oil supplied from an oil hole Sa formed in a sun gear shaft S is supplied to each planetary gear 2. Oil holes 24, 3 formed in the gear shafts 23, 33
4 can be supplied via each oil groove 71. The oil plate 7 is provided with a positioning hole 72 that engages with a protrusion (not shown) protruding from one of the side plates 41 and 51.

[0011]

As is apparent from the above description, according to the present invention, both the first and second carriers can be moved relative to each other in the radial direction by the play of the serration engaging portion. At the time of assembly, two sets of planetary gears are automatically aligned, and the two sets of planetary gears can be accurately meshed with the sun gear and the ring gear.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an example of the carrier of the present invention.

FIG. 2 is a right side view of FIG.

FIG. 3 is a left side view of FIG. 1;

FIG. 4 is an enlarged view of a serration engaging portion between a first carrier and a second carrier.

FIG. 5 is a sectional view taken along line VV of FIG. 4;

FIG. 6 is a side view of an oil plate provided between both carriers.

[Explanation of symbols]

Reference Signs List 1 double planetary carrier 2, 3 planetary gear 4 first carrier 41, 42 side plate 43 gap 45 serration teeth 5 second carrier 51, 52 side plate 53 gap 51a cylindrical portion 54 serration teeth

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-60-84443 (JP, A) JP-A-63-289312 (JP, A) Fully open Showa 60-91845 (JP, U) Really open 85750 (JP, U) Jiko 49-19740 (JP, Y1) Jiko 59-29172 (JP, Y2) (58) Fields investigated (Int. Cl. ⁷ , DB name) F16H 1 / 28,3 / 58,57 / 08

Claims (1)

(57) [Claims] 1. A double planetary carrier for carrying two sets of planetary gears spaced apart in the axial direction, wherein a pair of side plates opposed to each other via a planetary gear on one side in the axial direction is connected via a spacer. And a second carrier formed by connecting a pair of side plates facing each other across a planetary gear on the other side in the axial direction via a spacer, and a side plate of the first carrier facing directly in the axial direction. Forming a cylindrical portion for receiving the other side plate on the outer periphery of one side plate with the side plate of the second carrier;
Serration teeth are formed on the cylindrical portion and the outer periphery of the other side plate to be engaged with play with each other, and the two carriers are serrated and engaged .
The two sets of planetary gears
When meshing with the sun gear, the two planetary gears
Is a double planetary carrier that is automatically aligned with Sun Gear.