CN210715884U - Powder metallurgy planet carrier - Google Patents

Abstract

The utility model discloses a powder metallurgy planet carrier, increase in proper order and the first planet carrier of equal coaxial setting including the diameter, second planet carrier and one way clutch inner circle, the welding boss welded fastening of four stabilizer blades of first planet carrier and second planet carrier, be provided with the sun gear axle mounting hole of one-to-one on first planet carrier and second planet carrier respectively, big planet gear axle mounting hole, little planet gear axle mounting hole, antifriction board mounting hole, first planet carrier, second planet carrier and one way clutch inner circle are made by powder metallurgy material, one way clutch inner circle cover is established on first planet carrier, one way clutch inner circle is provided with the curb plate of round inward extension on being close to the inner circle mouth of second planet carrier one end, this curb plate welding is on the outer wall of first planet carrier and the welding platform's of second planet carrier terminal surface. The utility model discloses make the planet carrier change in adopting powder metallurgy technology to make, can effective reduce cost.

Description

Powder metallurgy planet carrier

Technical Field

The utility model belongs to the gearbox field, concretely relates to powder metallurgy planet carrier.

Background

The planetary gear transmission is a transmission for realizing speed change by using a planetary gear mechanism, and the planetary gear mechanism which is applied to an automatic transmission is mainly composed of a Simpson gear mechanism and a Ravinelach gear mechanism. The planet carrier is one of the main components of the planetary gear mechanism, and the planet wheel shaft or the bearing is arranged on the planet carrier.

Referring to fig. 1 to 3, a ravigneaux carrier used in a conventional one-way clutch includes a first carrier a, a second carrier B and a one-way clutch inner D, the first carrier a has four legs, the second carrier B has a ring of welding platform, the legs of the first carrier a and the welding platform of the second carrier B are welded together, the first carrier a and the second carrier B are respectively provided with a sun gear shaft mounting hole E, a large planet gear shaft mounting hole F, a small planet gear shaft mounting hole G and an antifriction plate mounting hole H which are in one-to-one correspondence, the first carrier a is sleeved outside the one-way clutch inner D, an annular connecting plate C is arranged between the first carrier a and the second carrier B, the connecting plate C connects the second carrier B and the one-way clutch inner D together, the connecting plate C is welded together with the end face of the second carrier B and the inner side wall of the one-way clutch inner D, splines are machined on the outer peripheral surfaces of the inner ring D of the one-way clutch and the second planet carrier B of the one-way clutch, and similar structures are also described in the granted patent CN201520808635.4 of the Chinese utility model. The existing Ravinelach type planet carrier is made of steel parts and has the following defects: the machining efficiency is low, the cost is high, materials are wasted, meanwhile, the steel part is usually welded by an electron beam, the process is complex, the problems can be avoided by adopting the powder metallurgy process, however, if the steel part is directly molded by a mold according to the existing structure, the difficulty is high, and the molded product can not meet the original performance requirements.

Disclosure of Invention

For solving the technical problem that above-mentioned planet carrier can not directly adopt the direct shaping of powder metallurgy technology, the utility model provides a powder metallurgy planet carrier can adopt the direct shaping of powder metallurgy technology, and can reach relevant performance requirement.

Therefore, the utility model discloses the technical scheme who adopts does: a powder metallurgy planet carrier comprises a first planet carrier, a second planet carrier and a one-way clutch inner ring, wherein the diameters of the first planet carrier, the second planet carrier and the one-way clutch inner ring are sequentially increased and are coaxially arranged, four support legs of the first planet carrier and a welding boss of the second planet carrier are welded and fixed, the first planet carrier and the second planet carrier are respectively provided with a sun gear shaft mounting hole, a big planet gear shaft mounting hole, a small planet gear shaft mounting hole and an antifriction plate mounting hole which are in one-to-one correspondence, splines are processed on the outer walls of the second planet carrier and the inner ring of the one-way clutch, the first planet carrier, the second planet carrier and the inner ring of the one-way clutch are all made of powder metallurgy materials, the inner ring of the one-way clutch is sleeved on the first planet carrier, a circle of side plates extending inwards are arranged on an inner ring opening of the inner ring of the one-way clutch close to one end of the second planet carrier, the side plate is welded on the outer wall of the first planet carrier and the end face of the welding platform of the second planet carrier.

Preferably, the outer walls of the four support legs of the first planet carrier are smooth and are all located in the same cylindrical surface, and the four support legs of the first planet carrier are uniformly distributed around the circumference of the sun gear shaft mounting hole. Compared with the original first planet carrier, the structure of the first planet carrier is more beneficial to mold forming by canceling the groove on the outer wall of the supporting leg.

Preferably, the second planet carrier is provided with four welding bosses which are uniformly arranged in a circumferential manner around the mounting hole of the sun gear shaft, the outer walls of the four welding bosses are located in the same cylindrical surface and are all provided with splines, and the welding parts of the four support legs of the first planet carrier are respectively welded on the corresponding welding bosses. By adopting the structure, a lubricating oil channel is formed between every two adjacent welding bosses.

Preferably, the four welding bosses are all of a structure with a thin middle part and thick two ends, and the shapes of the four welding parts of the first planet carrier are matched with the welding bosses. Structure more than adopting compares with original planet carrier, and the welding boss thickening of second planet carrier, the intensity of welding boss and stabilizer blade has been guaranteed in the stabilizer blade thickening of first planet carrier, and the welding area increase between the two makes connection structure more reliable and stable simultaneously.

Preferably, positioning bosses are arranged on end faces of the four welding bosses, and supporting leg positioning grooves and side plate positioning grooves which are matched with the positioning bosses are respectively arranged on the four welding parts of the first planet carrier and a side plate of the inner ring of the one-way clutch. By adopting the structure, the first planet carrier, the second planet carrier and the inner ring of the one-way clutch can be conveniently mounted and positioned, and the stress of the welding position of the three parts is shared when the planet carriers rotate.

The utility model has the advantages that: the structure of the inner ring of the one-way clutch is changed to enable the inner ring of the one-way clutch to be directly welded on the first planet carrier and the second planet carrier, so that a connecting plate which is not easy to form by a die is eliminated, the planet carrier is easier to manufacture by adopting a powder metallurgy process, the cost can be effectively reduced, the production efficiency is improved, the material utilization rate is improved, the structure is simplified, and the manufacturing procedures are reduced.

Drawings

Fig. 1 is a schematic structural diagram of a conventional planet carrier;

FIG. 2 is an exploded view of a prior art planet carrier;

fig. 3 is a schematic structural diagram of a conventional second planet carrier;

FIG. 4 is a schematic structural view of the present invention;

fig. 5 is an exploded view of the present invention;

fig. 6 is a schematic structural view of the first carrier.

Detailed Description

The invention will be further described by way of examples with reference to the accompanying drawings:

as shown in fig. 1 to 4, a powder metallurgy planet carrier comprises a first planet carrier 1, a second planet carrier 2 and a one-way clutch inner ring 3, wherein the diameters of the first planet carrier 1, the second planet carrier 2 and the one-way clutch inner ring 3 are sequentially increased and coaxially arranged, four support legs 101 of the first planet carrier 1 and a welding boss 201 of the second planet carrier 2 are welded and fixed, a sun gear shaft mounting hole, a large planet gear shaft mounting hole, a small planet gear shaft mounting hole and a friction reducing plate mounting hole which are in one-to-one correspondence are respectively arranged on the first planet carrier 1 and the second planet carrier 2, splines are respectively processed on the outer walls of the second planet carrier 2 and the one-way clutch inner ring 3, the first planet carrier 1, the second planet carrier 2 and the one-way clutch inner ring 3 are all manufactured by adopting a powder metallurgy process, the one-way clutch inner ring 3 is sleeved on the first planet carrier 1, a circle of side plates 301 extending inwards is arranged on an inner ring opening of one end of the second planet carrier 2, the inner edges of the side plates 301 are welded on the outer wall of the first planet carrier 1, and the end faces of the side plates 301 are welded on the end faces of the welding platform 201 of the second planet carrier 2. The connecting plate C of the existing planet carrier is difficult to form when manufactured by adopting a powder metallurgy process, and cannot meet the relevant strength requirement, so that the connecting plate C which is difficult to form is omitted, the structure of the one-way clutch inner ring 3 is changed, the one-way clutch inner ring 3 can be directly welded on the first planet carrier 1 and the second planet carrier 2, the forming difficulty is greatly reduced, and the relevant performance requirement is ensured; the inner ring 3 of the one-way clutch only keeps a part with splines and is suitable for the structure of the existing clutch.

As shown in fig. 3 and 4, the outer walls of the four legs 101 of the first carrier 1 are smooth and all located in the same cylindrical surface, and the four legs 101 of the first carrier 1 are uniformly distributed circumferentially around the sun gear shaft mounting hole. The outer walls of the support legs of the existing first planet carrier A are provided with grooves, so that the forming of a mold is not facilitated, the grooves are eliminated from the planet carrier of the embodiment, and the outer walls of the four support legs 101 of the first planet carrier 1 are smooth, so that the forming of the mold is facilitated.

As shown in fig. 3 and 4, the second planet carrier 2 is provided with four welding bosses 201, the four welding bosses 201 are uniformly arranged around the sun gear shaft mounting hole in a circumferential manner, the outer walls of the four welding bosses 201 are all located in the same cylindrical surface, and splines are all processed, the welding portions 101a of the four support legs 101 of the first planet carrier 1 are respectively welded on the corresponding welding bosses 201, in this embodiment, the side walls of the welding bosses 201 and the support legs 101 are all subjected to smooth processing, the hole walls of the pinion gear shaft mounting holes of the support legs 101 are subjected to thickening processing, and the strength is ensured while the mold is favorably formed. The four welding bosses 201 are all of a structure with a thin middle and thick two ends, and the shape of the four welding parts 101a of the first planet carrier 1 is matched with the welding bosses 201. Positioning bosses 201a are respectively arranged on the end surfaces of the four welding bosses 201, and leg positioning grooves 101b and side plate positioning grooves 301a corresponding to the positioning bosses 201a are respectively arranged on the four welding parts 101a of the first carrier 1 and the side plate 301 of the one-way clutch inner ring 3.

Claims (5)

1. The utility model provides a powder metallurgy planet carrier, includes diameter increase in proper order and equal coaxial first planet carrier (1), second planet carrier (2) and one way clutch inner circle (3) that set up, four stabilizer blades (101) of first planet carrier (1) and welding boss (201) welded fastening of second planet carrier (2) be provided with sun gear axle mounting hole, big planet gear axle mounting hole, little planet gear axle mounting hole, antifriction board mounting hole of one-to-one on first planet carrier (1) and second planet carrier (2) respectively it has the spline, its characterized in that all to process on the outer wall of second planet carrier (2) and one way clutch inner circle (3): first planet carrier (1), second planet carrier (2) and one way clutch inner circle (3) are made by powder metallurgy material, one way clutch inner circle (3) cover is established on first planet carrier (1), be provided with curb plate (301) that the round inwards extended on the inner circle mouth that one way clutch inner circle (3) are close to second planet carrier (2) one end, this curb plate (301) welding is on the terminal surface of the outer wall of first planet carrier (1) and welding boss (201) of second planet carrier (2).

2. The powder metallurgy planet carrier of claim 1, wherein: the outer walls of the four support legs (101) of the first planet carrier (1) are smooth and are located in the same cylindrical surface, and the four support legs (101) of the first planet carrier (1) are evenly distributed on the circumference of the mounting hole around the sun gear shaft.

3. The powder metallurgy planet carrier of claim 1 or 2, wherein: be provided with four in second planet carrier (2) welding boss (201), four welding boss (201) are the circumference around the sun gear axle mounting hole and evenly arrange, and the outer wall of four welding boss (201) all is located same cylinder, and all processes there is the spline, weld part (101a) of four stabilizer blades (101) of first planet carrier (1) weld respectively on corresponding welding boss (201).

4. The powder metallurgy planet carrier of claim 3, wherein: the four welding bosses (201) are all of a structure with a thin middle and thick two ends, and the shapes of the four welding parts (101a) of the first planet carrier (1) are matched with the welding bosses (201).

5. The powder metallurgy planet carrier of claim 3, wherein: positioning bosses (201a) are arranged on the end faces of the four welding bosses (201), and supporting leg positioning grooves (101b) and side plate positioning grooves (301a) which are matched with the positioning bosses (201a) are respectively arranged on the four welding parts (101a) of the first planet carrier (1) and the side plates (301) of the one-way clutch inner ring (3).

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