Planet carrier assembly structure of integrated output spline

Abstract

A planet carrier assembly structure of an integrated output spline comprises a planet carrier and a planet carrier pressing plate, a planet shaft hole is formed in the connecting position of the planet carrier and the planet carrier pressing plate, and the planet carrier and the planet carrier pressing plate are connected and fixed through connecting pieces arranged on the two sides of the planet shaft hole. A second radial plate and a first radial plate are arranged on the left side and the right side of the planet carrier respectively and connected through a double-layer rib plate, a center hole of the planet carrier is a space where a planet carrier pressing plate is inserted, the right side of the planet carrier pressing plate extends into the center hole of the planet carrier, and a third radial plate on the left side of the planet carrier pressing plate is fixedly connected with the second radial plate. An output spline is arranged in the center of the planet carrier pressing plate, and an annular stop boss is arranged on the right side of the third radial plate. According to the structure, the cost and the machining difficulty are reduced through the split type design, and the torsional deformation of the planet carrier assembly is reduced through an expanded connecting interface and a double-layer rib plate connecting mode.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of speed reducer, in particular to a planetary carrier assembly structure integrated with output spline. BACKGROUND

[0002] In the prior art, the commonly used planetary carrier of the speed reducer is mainly of two structures, i.e. an integrated planetary carrier with double-layer web plates and a split planetary carrier with double-layer web plates. For the integrated planetary carrier with double-layer web plates, the two web plates and the connecting part in the middle are integrally formed by casting or forging, which has the advantages of high structural rigidity, complete load transmission path, etc. However, if the output spline is integrated, a full steel structure is required, which leads to an increase in material cost, and the whole machining is difficult, the manufacturing cycle is long, and the process is complex. For the split planetary carrier with double-layer web plates, the web plates are connected by a single-layer web plate through screw connection or welding, which is convenient for machining and assembly, and reduces the manufacturing difficulty. However, the contact area of the joint surface is small, the stress is uneven, and under asymmetric load or high-speed working condition, the joint surface is prone to micro-displacement and local deformation, which affects the load sharing characteristics and meshing accuracy of the planetary gear, and further causes problems such as vibration noise increase and transmission reliability decrease. SUMMARY

[0003] The purpose of the present application is to provide a planetary carrier assembly structure integrated with output spline, which reduces the cost and machining difficulty through split design, and reduces the torsional deformation of the planetary carrier assembly through the enlarged connecting interface and the double-layer web plate connection method.

[0004] The purpose of the present application is achieved by the following scheme: a planetary carrier assembly structure integrated with output spline, comprising a planetary carrier and a planetary carrier pressure plate, a planetary shaft hole is arranged at the connection between the planetary carrier and the planetary carrier pressure plate, the planetary carrier and the planetary carrier pressure plate are connected and fixed through the connecting pieces arranged on both sides of the planetary shaft hole, the left and right sides of the planetary carrier are respectively provided with a second web plate and a first web plate, the second web plate and the first web plate are connected through a double-layer web plate, the center hole of the planetary carrier is a space for the planetary carrier pressure plate to insert, the right side of the planetary carrier pressure plate extends into the center hole of the planetary carrier, the third web plate on the left side of the planetary carrier pressure plate is connected and fixed with the second web plate, the center of the planetary carrier pressure plate is an output spline, and the right side of the third web plate is provided with an annular stop boss.

[0005] The planetary shaft hole is arranged at the connection between the third web plate and the second web plate, and the planetary shaft hole is axially penetrated to the first web plate.

[0006] The planetary shaft hole is uniformly arranged along the circumference of the planetary carrier assembly.

[0007] The double-layer web plate comprises a first web plate and a second web plate arranged along the radial direction of the planetary carrier, a hollow area is formed between the first web plate and the second web plate, and oil passing structures can be added on the first web plate and the second web plate according to the use requirements.

[0008] The oiling structure and the hollowed-out area are located between the first and second radial plates and are uniformly distributed circumferentially along the planet carrier.

[0009] The first radial plate surface is provided with a first annular protrusion extending away from the second radial plate; the third radial plate surface is provided with a stepped annular protrusion surrounding away from the first radial plate, the stepped annular protrusion comprising a second annular protrusion and a third annular protrusion arranged in sequence, the diameter of the second annular protrusion being greater than that of the third annular protrusion.

[0010] The second radial plate is provided with a first radial contact surface, and the cylindrical surface of the annular stop boss close to the planet shaft hole is a second radial contact surface, the first radial contact surface being radially supported on the second radial contact surface.

[0011] The right end of the output spline has an L-shaped notch, and the L-shaped notch is sealingly connected with the disc with a frame.

[0012] The planet carrier is formed by casting, and the planet carrier pressing plate is formed by machining.

[0013] The planet carrier has a first radial plate and a second radial plate arranged oppositely, and the two are connected by a double-layer rib plate; the planet carrier pressing plate comprises a third radial plate, an annular boss is formed on the third radial plate by machining, the boss is a stop structure, and an output spline is fixedly arranged in the middle of the third radial plate; the second radial plate and the third radial plate are fixedly connected through a plurality of connecting pieces located on both sides of the planet shaft hole, and the second radial plate is radially supported on the stop structure. Through the enlarged connecting interface and the double-layer rib plate connection mode, the torsional deformation amount of the planet carrier assembly is reduced; 2. The planet carrier is formed by casting, and the planet carrier pressing plate is formed by machining, which not only meets the strength and precision design requirements of the output spline, but also reduces the machining difficulty of the planet carrier and saves the manufacturing cost. BRIEF DESCRIPTION OF DRAWINGS

[0014] Fig. 1 is a structural schematic diagram of the present application; Fig. 2 is a sectional view of the present application; Fig. 3 is a structural schematic diagram of the planet carrier of the present application; Fig. 4 is a structural schematic diagram of the planet carrier pressing plate of the present application. DETAILED DESCRIPTION

[0015] As Figs. 1 to 4A planetary carrier assembly structure with integrated output splines includes a planetary carrier 1 and a planetary carrier pressure plate 2. A planetary shaft hole 3 is provided at the connection between the planetary carrier 1 and the planetary carrier pressure plate 2. The planetary shaft hole 3 is located at the connection between the third spoke 21 and the second spoke 12, and extends axially through the first spoke 11. The planetary shaft holes 3 are evenly distributed along the circumference of the planetary carrier assembly. The planetary carrier 1 and the planetary carrier pressure plate 2 are connected and fixed by connectors 4 provided on both sides of the planetary shaft hole 3, thereby increasing the connection interface between the planetary carrier 1 and the planetary carrier pressure plate 2 and further reducing the torsional deformation of the planetary carrier assembly. The planetary carrier 1 has a second spoke 12 and a first spoke 11 on its left and right sides, respectively. The second spoke 12 and the first spoke 11 are connected by a double-layer rib plate 13. The central hole of the planetary carrier 1 is the space for inserting the planetary carrier pressure plate 2. The right side of the planetary carrier pressure plate 2 extends into the central hole of the planetary carrier 1. The third spoke 21 on the left side of the planetary carrier pressure plate 2 is connected and fixed to the second spoke 12. The center of the planetary carrier pressure plate 2 is the output spline 23. The right side of the third spoke 21 is provided with an annular stop boss 22.

[0016] The double-layer stiffener 13 includes a first stiffener 131 and a second stiffener 132 arranged radially along the planetary carrier 1. A hollow area 14 is formed between the first stiffener 131 and the second stiffener 132. An oil passage structure 15 can be added to the first stiffener 131 and the second stiffener 132 according to usage requirements. The oil passage structure 15 can reduce the weight of the planetary carrier assembly. The specific shape of the oil passage structure 15 can be adapted and optimized according to actual design requirements. The hollow area 14 can be implemented as a bidirectional through-hole, a unilateral through-hole, or a non-through-hole structure. The shape of the oil passage structure 15 can also be adjusted accordingly, including but not limited to circular, elliptical, or polygonal holes. The above-mentioned combination of the hollow area 14 structure and the oil passage structure 15 reduces the weight of the planetary carrier assembly and saves material costs, while also effectively increasing the lubricating oil flow channels inside the planetary carrier assembly.

[0017] The oil-passing structure 15 and the hollow area 14 are located between the first spoke 11 and the second spoke 12, and are evenly distributed circumferentially along the planetary carrier 1. This allows the lubricating oil to flow and distribute around the planetary gears, thereby improving the lubrication effect of the planetary gears.

[0018] The first spoke 11 has a first annular protrusion 16 extending away from the second spoke 12. The third spoke 21 has a stepped annular protrusion surrounding it in a direction away from the first spoke 11. This stepped annular protrusion includes a second annular protrusion 24 and a third annular protrusion 25 arranged sequentially, with the diameter of the second annular protrusion 24 being larger than the diameter of the third annular protrusion 25. The first annular protrusion 16 and the second annular protrusion 24 are used for the installation of the planetary carrier assembly support bearing, ensuring smooth rotation of the planetary carrier assembly and reducing friction. The third annular protrusion 25 is used for the installation of an oil seal, forming a sealed structure in the reducer to prevent internal lubricating oil leakage and to block external foreign objects from entering the support bearing and planetary carrier assembly chamber. The second spoke 12 has a first radial contact surface 121, and the cylindrical surface of the annular stop boss 22 near the planetary shaft hole 3 is the second radial contact surface 221. The first radial contact surface 121 is radially supported on the second radial contact surface 221. This ensures that the planetary carrier plate 2 and the planetary carrier 1 are assembled more quickly and accurately, and also guarantees the coaxiality of the first annular protrusion 6, the second annular protrusion 4, the third annular protrusion 5 and the output spline 23.

[0019] The output spline 23 has an L-shaped notch 231 on its right end, which is sealed to the edged disc 5. This further creates a sealed structure in the reducer, ensuring that the output spline 23 has sufficient lubricating oil and guaranteeing the reliability of the transmission.

[0020] The planetary carrier 1 is cast, while the planetary carrier pressure plate 2 is machined. The first spoke 11, the second spoke 12, and the double-layer stiffener 13 of the planetary carrier 1 are an integral structure. Casting reduces the machining difficulty of the planetary carrier 1 and saves manufacturing costs. The output spline 23 is fixedly located in the middle 21 of the third spoke of the planetary carrier pressure plate 2. Machining meets the strength and precision design requirements of the output spline 23. Through the split design and the application of differentiated materials, the overall structure of the planetary carrier assembly is optimized.

[0021] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications made to the present invention by those skilled in the art without departing from the spirit of the present invention shall fall within the protection scope of the present invention.

Claims

1. An integrated output spline carrier assembly structure, comprising a carrier (1) and a carrier pressing plate (2), a planet shaft hole (3) is arranged at the connection of the carrier (1) and the carrier pressing plate (2), characterized in that: The planet carrier (1) is connected and fixed with the planet carrier pressure plate (2) through the connecting piece (4) arranged at both sides of the planet shaft hole (3), the left and right sides of the planet carrier (1) are respectively provided with the second web plate (12) and the first web plate (11), the second web plate (12) and the first web plate (11) are connected through the double-layer rib plate (13), the center hole of the planet carrier (1) is a space for the planet carrier pressure plate (2) to insert, the right side of the planet carrier pressure plate (2) extends into the center hole of the planet carrier (1), the third web plate (21) on the left side of the planet carrier pressure plate (2) is connected and fixed with the second web plate (12), the center of the planet carrier pressure plate (2) is the output spline (23), and the right side of the third web plate (21) is provided with the annular stop boss (22).

2. The integrated output spline carrier assembly structure of claim 1, wherein: The planet shaft hole (3) is arranged at the connection position of the third web plate (21) and the second web plate (12), and the planet shaft hole (3) penetrates axially to the first web plate (11).

3. The integrated output spline carrier assembly structure of claim 2, wherein: The planet shaft holes (3) are uniformly arranged along the circumference of the planet carrier assembly.

4. The integrated output spline carrier assembly structure of claim 1, wherein: The double-layer rib plate (13) comprises the first rib plate (131) and the second rib plate (132) arranged along the radial direction of the planet carrier (1), the first rib plate (131) and the second rib plate (132) form the hollow area (14) therebetween, and the first rib plate (131) and the second rib plate (132) can be provided with the oil passing structure (15) according to the use requirement.

5. The integrated output spline carrier assembly structure of claim 1, wherein: The oil passing structure (15) and the hollow area (14) are located between the first web plate (11) and the second web plate (12) and are uniformly distributed along the circumferential direction of the planet carrier (1).

6. The integrated output spline carrier assembly structure of claim 1, wherein: The first web plate (11) is provided with the first annular protrusion (16) extending away from the second web plate (12); the third web plate (21) is provided with the stepped annular protrusion surrounding away from the first web plate (11), the stepped annular protrusion comprises the second annular protrusion (24) and the third annular protrusion (25) arranged in sequence, and the diameter of the second annular protrusion (24) is greater than that of the third annular protrusion (25).

7. The integrated output spline carrier assembly structure of claim 1, wherein: The second web plate (12) is provided with the first radial contact surface (121), and the cylindrical surface of the annular stop boss (22) close to the planet shaft hole (3) is the second radial contact surface (221), and the first radial contact surface (121) is radially supported on the second radial contact surface (221).

8. The integrated output spline carrier assembly structure of claim 1, wherein: The output spline (23) is provided with the L-shaped notch (231) at the right end, and the L-shaped notch (231) is sealingly connected with the disc (5) with a frame.

9. The integrated output spline carrier assembly structure of claim 1, wherein: The planet carrier (1) is formed by casting, and the planet carrier pressure plate (2) is formed by machining.

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