JPH0681905A - Double planetary carrier - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] To provide a double planetary carrier that can carry two sets of planetary gears on separate carriers and also ensure relative positional accuracy of the two sets of planetary gears. . [Structure] Two sets of planetary gears 2, which are separated in the axial direction,
Separate carriers 4 and 5 carrying 3 are provided, and both carriers 4 and 5 are connected to form a double planetary carrier 1. A cylindrical portion 51a that receives the side plate 41 of the other carrier 4 is formed on the outer periphery of the side plate 51 of one carrier 5, and the serration teeth 4 are formed on the outer periphery of the side plate 41 and the outer periphery of the cylindrical portion 51a.
5, 55 are formed, and both carriers 4, 5 are connected by serration engagement. Serration teeth 45, 55 are formed for playful engagement. When the two sets of planetary gears 2 and 3 are engaged with the sun gears S ₁ and S ₂ , both carriers 4 and 5 relatively move in the radial direction, and the two sets of planetary gears 2 and 3 become the sun gears S ₁ and S ₂ . On the other hand, it is automatically aligned.

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 that carries two sets of planetary gears that are axially separated.

[0002]

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

[0003]

In a normal planetary carrier carrying a set of planetary gears, the planetary gears are inserted between a pair of side plates connected via intervening pieces, and then the gears are pivotally supported. The carrier assembly is assembled by assembling the gear shaft so as to straddle both side plates and then caulking both ends of the gear shaft to fix the gear shaft to the carrier. However, in the double planetary carrier formed by integrally connecting the three side plates as in the above-mentioned conventional example, the fitting end of the gear shaft with respect to the intermediate side plate cannot be caulked, so that the gear shaft with respect to the outer side plate is not able to be caulked. There is no choice but to fix the gear shaft to the carrier by welding the mating end of the gear shaft to the side plate, and it takes time to weld the gear shaft, resulting in poor productivity.
In order to eliminate such a problem, two carriers having a pair of side plates that are connected to each other via a spacer are provided, and each carrier carries a planetary gear, and the carriers are connected to each other to form a double planetary carrier. However, in this case, how to secure the relative positional accuracy of the two sets of planetary gears becomes a problem. That is, in the carrier of the above-mentioned conventional example, since the gear shafts of the two sets of planetary gears are fitted to the intermediate side plate, respectively, the relative positional accuracy of the two sets of planetary gears is secured with reference to the intermediate side plate.
When two sets of planetary gears are carried by different carriers, it becomes difficult to secure the relative positional accuracy of the two sets of planetary gears due to manufacturing tolerances of the carriers and positioning tolerances when the carriers are connected to each other. .

In view of the above points, the present invention provides a double planetary carrier in which two sets of planetary gears are carried by separate carriers and the relative positional accuracy of the two sets of planetary gears can be secured. That is the purpose.

[0005]

[Means for Solving the Problems] In order to achieve the above object,
The present invention relates to a first carrier formed by connecting a pair of side plates facing each other with a planetary gear on one side in the axial direction interposed therebetween, and a pair of pairs of planetary gears on the other side in the axial direction facing each other. A second carrier formed by connecting side plates via a spacer, and a cylindrical portion for receiving the other side plate on the outer circumference of one of the side plates of the first carrier and the side plate of the second carrier that face each other in the axial direction. Serration teeth are formed on the cylindrical portion and the outer periphery of the other side plate so as to engage with each other with play, and both the carriers are engaged in serration engagement.

[0006]

In order to function as a double planetary carrier, it is necessary to ensure torque transmission between the first and second carriers, but this request is achieved by engaging both carriers in serration engagement. Since the serration engagement portion has play, when the two sets of planetary gears are engaged with the sun gear, both carriers relatively move in the radial direction, and the two sets of planetary gears are automatically aligned with the sun gear. The relative positional accuracy of the two sets of planetary gears is ensured.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIGS. 1 to 3, reference numeral 1 denotes a double planetary carrier, which carries two sets of planetary gears 2 and 3 axially separated from each other. 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 sets of planetary gears 2, 3 mesh the sun gears S ₁ , S ₂ on the common sun gear shaft S, and the ring gears R ₁ , R ₂ mesh 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, 5 has side plates 41, 51 on the inner side in the axial direction and side plates 42, 52 on the outer side in the axial direction, and is bent at a plurality of positions around the outer side plates 42, 52. The tips of the strips 43, 53 extending inward in the axial direction are welded to the inner side plates 41, 51 to manufacture the carriers 4, 5.
In the first carrier 4, a plurality of engagement holes 44 are formed in the inner side plate 41, the tips of the spacer pieces 43 are inserted into the holes 44 and welded, and in the second carrier 5, A plurality of coined seating surfaces 54 are formed on the back surface of the inner side plate 51, and the tips of the spacer pieces 53 are abutted against the seating surfaces 54 for welding. After manufacturing the carriers 4 and 5 as described above, the planetary gears 2 and 3 are inserted between both side plates of the carriers 4 and 5 with washers 21 and 31 attached to both ends thereof, and then the planetary gears. After assembling the gear shafts 23 and 33 penetrating the needle bearings 22 and 32 mounted on the inner circumferences of the two and three so as to straddle both side plates, the both ends of the gear shafts 23 and 33 are caulked, and each carrier 4, 5 Then, assemble the carrier assembly. On the outer periphery of the side plate 51 on the inner side of the second carrier 5, the cylindrical portion 5 that receives the side plate 41 on the inner side of the first carrier 4 facing the side plate 51.
1a is formed, and the outer periphery of the side plate 41 and the cylindrical portion 51a are formed.
Outer and inward serration teeth 45 and 55 are respectively formed in and so that both the first and second carriers 4 and 5 are engaged in serration. In addition, as shown in FIGS. 4 and 5, at a plurality of positions around the back surface of the side plate 41 of the first carrier 4, as shown in FIGS.
And at the same time, the plurality of positions around the tip of the tubular portion 51a are swaged radially inward at the roots of the serration teeth 55, and the swaged portion 56 is engaged with the recessed groove portion 46,
The two carriers 4 and 5 are immovably connected in the axial direction to form the double planetary carrier 1. The tubular portion 51
a is formed so as to project to the back of the side plate 41, and a circlip that engages with the back surface of the side plate 41 is attached to the inner periphery of this protruding portion to connect both carriers 4, 5 in the axial direction. good.

Here, the serration teeth 45, 55
4 are formed so as to engage with each other with play, as shown in FIG. 4, and therefore, when the two sets of planetary gears 2, 3 are engaged with the sun gears S ₁ , S ₂ , both carriers 4, 5 moves relatively, and two sets of planetary gears 2, 3
Is automatically aligned with the sun gears S ₁ and S ₂ .

Also, the side plates 4 inside the carriers 4, 5
A rubber oil plate 7 having a plurality of oil grooves 71 as shown in FIG. 6 is interposed between the first and the first 51, and the lubricating oil supplied from the oil hole Sa formed in the 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 through each oil groove 71. The oil plate 7 is formed with a positioning hole 72 that engages with a protrusion (not shown) provided on one of the side plates 41 and 51.

[0011]

As is apparent from the above description, according to the present invention, the first and second carriers can be relatively moved in the radial direction by the play of the serration engagement portion, so that the planetary gear mechanism can be operated. At the time of assembly, the 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 drawings]

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

FIG. 2 is a right side view of FIG.

FIG. 3 is a left side view of FIG.

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

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

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

[Explanation of symbols]

1 Double Planetary Carrier 2, 3 Planetary Gear 4 First Carrier 41, 42 Side Plate 43 Space Piece 45 Serration Teeth 5 Second Carrier 51, 52 Side Plate 53 Space Piece 51a Cylindrical Section 54 Serration Teeth

Claims (1)

[Claims] 1. A double planetary carrier carrying two sets of planetary gears axially separated from each other, wherein a pair of side plates facing each other with a planetary gear on one side in the axial direction sandwiched therebetween are connected via a spacer piece. And a second carrier formed by connecting a pair of side plates facing each other across the planetary gear on the other side in the axial direction through an intervening piece, and a side plate of the first carrier facing directly in the axial direction. A cylindrical portion for receiving the other side plate is formed on the outer periphery of the side plate of the second carrier and one side plate,
A double planetary carrier characterized in that serration teeth are formed on the tubular portion and the outer periphery of the other side plate so as to engage with each other with play, and both the carriers are engaged with each other by serration.