A composite planetary gear system

Abstract

A composite planetary gear train belongs to the field of automotive automatic transmission technology. The cage spokes connect to the planetary gear train, planetary shafts, hydraulic cylinder, and shaped rubber parts. The hydraulic cylinder connects to its inner wall and the shaped rubber parts, with a central cylinder protrusion. The shaped rubber parts connect to the clutch piston. The return spring connects to the clutch piston and the return spring cage. The return spring cage connects to the inner wall of the hydraulic cylinder and the clutch piston. A balance chamber is formed between the clutch piston, the return spring cage, the hydraulic cylinder, and its inner wall. The outer ring connects to a wave-shaped pressure plate, a pressure plate, and friction plates. The wave-shaped pressure plate corresponds to the piston ring body. This invention shortens the axial length of the component and improves overall rigidity, achieving efficient power transmission and reliable disconnection. The overall structure is compact, with high transmission efficiency, conforming to the development trend of multi-gear, miniaturization, lightweight, and low-cost automatic transmissions.

Description

Technical Field

[0001] This utility model relates to a composite planetary gear system, belonging to the field of automotive automatic transmission technology. Background Technology

[0002] An automatic transmission is a transmission device that automatically switches to the appropriate gear according to the vehicle's driving conditions. Its core structure typically includes at least one planetary gear set and friction plate assemblies (such as clutches and brakes) for controlling the operating components. The planetary gear set has a sun gear, an internal ring gear (ring gear), and a planet carrier (planetary gear carrier) as operating components. Through the operation of the hydraulic control system, the engagement or disengagement of the clutch and brake is controlled, thereby realizing the switching of different gears.

[0003] Friction clutches, as key components for power transmission, are widely used in automatic transmissions and other mechanical fields. Their structure includes a piston, multiple pressure plates, and multiple friction plates alternately arranged with the pressure plates. When the hydraulic system applies pressure to the piston, the pressure plates move under hydraulic pressure and contact the friction plates, transmitting power through friction to achieve the shift of the target gear. When the hydraulic system releases pressure, the piston returns to its initial position under the action of elastic elements such as return springs, and the pressure plates move accordingly, separating from the friction plates, thus disengaging the power connection between the operating components.

[0004] With technological advancements and increasing market demand, automatic transmissions are evolving towards multi-gear, miniaturization, lightweight design, high efficiency, and low cost. To meet these trends, component design needs further simplification, and even structural integration through modular design, to reduce overall size and weight, improve transmission efficiency, and lower manufacturing costs. Summary of the Invention

[0005] To address the problems existing in the background technology, this utility model provides a composite planetary gear system.

[0006] To achieve the above objectives, this utility model adopts the following technical solution: A composite planetary gear train, comprising a planetary gear train and a clutch assembly, wherein the clutch assembly comprises a clutch retainer, a pressure plate, friction plates, a clutch piston, a return spring retainer, a return spring, a BPS, and a wave pressure plate; the clutch retainer comprises an outer ring, retainer spokes, and an inner wall of a cylinder; the output end of the retainer spokes is connected to the input end of the planetary gear train, the middle part of the retainer spokes is inserted into one end of the planetary shaft, and the other end of the planetary shaft is inserted into the planetary gear train; the clutch retainer contains a BPS, a clutch piston, a return spring, and a return spring retainer, wherein the BPS comprises a shaped rubber component and a cylinder; the cylinder is fixed to the retainer spokes, the inner end of the cylinder is sealed and fitted to the inner wall of the cylinder, the outer end of the cylinder is interference-fitted to one end of the shaped rubber component, one end of the shaped rubber component is simultaneously connected to the outer end of the piston pressure ring body of the clutch piston, and the other end of the shaped rubber component is connected to the inner wall of the retainer spokes. The cylinder has a cylinder protrusion in the middle, away from the retainer spokes. A piston chamber is formed between the rubber lip of the shaped rubber part, the piston ring body of the clutch piston, and the cylinder. The piston chamber is connected to the piston chamber oil passage of the planetary gear system. A lubricating oil chamber is formed between the cylinder protrusion, the shaped rubber part, the clutch retainer, and the planetary shaft. The lubricating oil chamber is connected to a lubricating oil hole on the inner wall of the cylinder. The outer end of the return spring abuts against the stamped protrusion in the middle of the clutch piston, and the inner end of the return spring abuts against the return spring retainer. The annular recess at the inner end of the return spring retainer is limited to the inner wall of the cylinder. The outer wall of the cylinder at the outer end of the return spring retainer is connected to the clutch piston. A balance chamber is formed between the clutch piston, the return spring retainer, the cylinder, and the inner wall of the cylinder. The balance chamber is connected to a lubricating oil hole on the inner wall of the cylinder. The inner wall of the outer ring is connected to a wave-shaped pressure plate and multiple alternately arranged pressure plates and friction plates. The wave-shaped pressure plate is correspondingly arranged to the piston ring body.

[0007] Furthermore, the planetary gear train includes a planet carrier and planetary gears; a planetary shaft is interference-fitted onto the planet carrier, and a planetary gear is fitted onto the outer side of the planetary shaft.

[0008] Furthermore, the planetary carrier includes a fixed arm, planetary carrier spokes, and an output shaft; the input end of the output shaft is provided with planetary carrier spokes, the planetary carrier spokes are provided with a fixed arm and a planetary shaft, the fixed arm is provided with a piston chamber oil passage, and the piston chamber oil passage supplies oil to the clutch assembly.

[0009] Furthermore, the planetary shaft has an internal lubricating oil passage that is connected to the lubricating oil chamber, and an oil outlet is provided in the middle of the planetary shaft.

[0010] Furthermore, a bushing is provided on the inner wall of the input end of the output shaft.

[0011] Furthermore, the inner wall of the planetary carrier spokes is provided with a thrust bearing.

[0012] Furthermore, a bearing inner ring is fitted onto the outer wall of the output end of the output shaft.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] This invention achieves structural simplification and material savings by integrating the clutch retainer with the planetary carrier spokes, shortening the axial length of the components and improving overall rigidity. The outer diameter of the clutch retainer adopts a circular structure, reducing the churning loss of lubricating oil and improving operating efficiency. The oil circuit system is integrated inside the planetary carrier, eliminating the need for additional oil circuit structures, thus saving space and manufacturing costs. The planetary shaft and planetary carrier adopt an interference fit combined with an elastic retaining ring and BPS axial stop design, effectively preventing the planetary shaft from disengaging, rotating, and circumferentially displacing, ensuring transmission reliability. The optimized design of the lubrication oil passages and oil cavity structure ensures that ATF oil continuously lubricates key parts such as needle roller bearings, reducing the risk of wear. The clutch assembly drives the piston to press the pressure plate and friction plates through pressurized oil, achieving efficient power transmission and reliable disconnection. The overall structure is compact and has high transmission efficiency, conforming to the development trend of multi-gear, miniaturization, lightweight, and low-cost automatic transmissions. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model. Detailed Implementation

[0016] The technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of the utility model, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the protection scope of this utility model.

[0017] A composite planetary gear train includes a planetary gear train 1 and a clutch assembly 2. The clutch assembly 2 includes a clutch retainer 4, a pressure plate 16, friction plates 17, a clutch piston 18, a return spring retainer 19, a return spring 20, a BPS (Bonded Piston Seals) 22, and a wave-shaped pressure plate 24. The clutch retainer 4 includes an integrally stamped outer ring 401, retainer spokes 402, and a cylinder inner wall 404.

[0018] Both the outer ring 401 and the inner wall 404 of the cylinder extend axially from the cage spokes 402. The inner side of the outer ring 401 has a trapezoidal tooth structure, which can be circular or toothed. A snap ring groove is machined on the side near the end, and a snap ring 25 is installed in the snap ring groove.

[0019] A retaining ring groove 2 is machined on the inner wall 404 near the end, and a retaining ring 21 is installed in the retaining ring groove 2.

[0020] The output end of the cage spoke 402 is welded to the input end of the fixed arm 301 of the planetary gear train 1, forming a weld 6.

[0021] The central shaft hole 403 in the middle of the cage spoke 402 is inserted into one end of the planetary shaft 26, and the other end of the planetary shaft 26 is inserted into the planetary gear train 1;

[0022] The clutch retainer 4 is provided with BPS22, clutch piston 18, return spring 20 and return spring retainer 19 arranged sequentially along the axial direction inside the clutch retainer 4.

[0023] The BPS22 includes a shaped rubber part 2201 and a hydraulic cylinder 2203. The hydraulic cylinder 2203 is riveted to the cage spoke 402 by rivets 405, serving as an axial stop for the planetary shaft 26. The inner end of the hydraulic cylinder 2203 is sealed and fitted to the inner wall 404 of the hydraulic cylinder, and the outer end of the hydraulic cylinder 2203 is press-fitted to one end of the shaped rubber part 2201. One end of the shaped rubber part 2201 is simultaneously connected to the outer end of the piston ring body 1801 of the clutch piston 18, and the other end of the shaped rubber part 2201 is connected to the inner wall of the cage spoke 402. The hydraulic cylinder 2203 has a cylinder protrusion 2202 in the middle that is away from the cage spoke 402. The rubber lip of the shaped rubber part 2201 forms a piston chamber 10 between the piston ring body 1801 of the clutch piston 18 and the hydraulic cylinder 2203. The piston chamber 10 is connected to the piston chamber oil passage of the planetary gear train 1.

[0024] The piston chamber 10 is not completely sealed. There is an oil inlet on the oil cylinder 2303. The oil inlet is connected to the oil inlet 1001 and oil outlet 1002 on the output shaft 303. After ATF oil is filled into the oil inlet 1001 and oil outlet 1002, the piston chamber 10 can maintain pressure. In order to avoid leakage between different parts, a sealing ring 23 is added at the oil inlet.

[0025] The lubricating oil cavity 27 is formed between the cylinder protrusion 2202, the irregular rubber part 2201, the clutch retainer 4, and the planetary shaft 26. The lubricating oil cavity 27 is connected to the lubricating oil hole 2701 on the inner wall 404 of the cylinder.

[0026] The lubrication chamber 27 provides lubricating oil to the front needle roller bearing 14, the rear needle roller bearing 13, and the planetary gear 12 on the outer side of the planetary shaft 26.

[0027] The outer end of the return spring 20 abuts against the stamped protrusion 1802 in the middle of the clutch piston 18, and the inner end of the return spring 20 abuts against the return spring retainer 19. The annular recess 1902 at the inner end of the return spring retainer 19 is limited to the inner wall 404 of the cylinder by a snap ring 21. The axially extending outer wall 1901 of the cylinder at the outer end of the return spring retainer 19 is connected to the clutch piston 18. A balance chamber 11 is formed between the clutch piston 18, the return spring retainer 19, the cylinder 2203, and the inner wall 404 of the cylinder. The balance chamber 11 is connected to the lubricating oil hole 1101 on the inner wall 404 of the cylinder.

[0028] Lubricating oil enters the balance chamber 11 through the lubricating oil hole 2 1101. Under the action of centrifugal force, the forces on both sides of the clutch piston 18 are balanced, which facilitates the control of system oil pressure.

[0029] The inner wall of the outer ring 401 is connected to the corrugated pressure plate 24 and multiple alternately arranged pressure plates 16 and friction plates 17, and is axially limited by a snap ring 25. The inner side of the outer ring 401 has trapezoidal teeth formed by cold extrusion, and the corrugated pressure plate 24 and pressure plate 16 have shaped outer trapezoidal teeth. The outer ring 401 forms a key connection with the corrugated pressure plate 24 and pressure plate 16. The inner side of the friction plate 17 has shaped trapezoidal teeth, which cooperate with the trapezoidal teeth of the other component to form a key connection. When power is input, the corrugated pressure plate 24, pressure plate 16, and friction plate 17 are pressed tightly together, and power can be transmitted to the clutch retainer 4, and then to the output shaft 303. The corrugated pressure plate 24 is correspondingly arranged with the piston ring body 1801.

[0030] Furthermore, the planetary gear train 1 includes a planet carrier 3 and planetary gears 12. The planet carrier 3 is the main component of the planetary gear train 1. A planetary shaft bore 304 is provided on the planet carrier 3. A planetary shaft 26 is interference-fitted into the planetary shaft bore 304. The planetary gears 12 are mounted on the outer side of the planetary shaft 26 via a front needle roller bearing 14 and a rear needle roller bearing 13. Thrust washers 15 are fitted at both ends of the outer side of the planetary shaft 26, and the thrust washers 15 are fitted into both ends of the planetary gears 12. A retaining circlip groove 3 is provided at the end of the planetary shaft bore 304. A step is machined at the end of the planetary shaft 26. After the retaining circlip 3 5 is inserted into the retaining circlip groove 3 on the planet carrier 3, it cooperates with the step at the end of the planetary shaft 26 to axially stop the planetary shaft 26 and also prevent the planetary shaft from rotating.

[0031] Furthermore, the planetary carrier 3 includes an integrally forged fixed arm 301, a planetary carrier spoke plate 302, and an output shaft 303; the input end of the output shaft 303 is provided with a planetary carrier spoke plate 302, the planetary carrier spoke plate 302 is provided with a fixed arm 301 and a planetary shaft 26, the fixed arm 301 is provided with a piston chamber oil passage, the piston chamber oil passage is a connected oil inlet hole 1001 and an oil outlet hole 1002, and the piston chamber oil passage supplies oil to the clutch assembly 2.

[0032] Furthermore, the planetary shaft 26 is provided with a lubricating oil passage inside, which is connected to the lubricating oil chamber 27. The planetary shaft 26 is provided with an oil outlet in the middle. Under the action of gravity and centrifugal force, the lubricating oil flows into the lubricating oil passage through the lubricating oil chamber 27, thereby providing lubrication for the needle roller bearings and planetary gears, preventing the parts from burning during operation. The ideal oil supply position is between the two needle roller bearings.

[0033] Furthermore, the inner wall of the input end of the output shaft 303 is provided with a bushing 9 to facilitate the positioning of adjacent parts.

[0034] Furthermore, the inner wall of the planetary carrier spoke plate 302 is provided with a thrust bearing 7, which facilitates the positioning of adjacent parts.

[0035] Furthermore, the outer wall of the output end of the output shaft 303 is fitted with a bearing inner ring 8, which cooperates with the needle roller bearing on the gearbox housing to facilitate its own positioning.

[0036] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of the equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0037] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A composite planetary gear train, characterized in that: The system includes a planetary gear train (1) and a clutch assembly (2). The clutch assembly (2) includes a clutch retainer (4), a pressure plate (16), friction plates (17), a clutch piston (18), a return spring retainer (19), a return spring (20), a BPS (22), and a wave pressure plate (24). The clutch retainer (4) includes an outer ring (401), retainer spokes (402), and an inner wall of a hydraulic cylinder (404). The output end of the retainer spokes (402) is connected to the input end of the planetary gear train (1), and the middle part of the retainer spokes (402) is inserted into one end of a planetary shaft (26). The other end of the planetary shaft (26) is inserted into the planetary gear train (1). The clutch retainer (4) is equipped with a BPS (22), a clutch piston (18), a return spring (20), and a return spring retainer (19). The BPS (22) includes a shaped rubber part (2201) and a hydraulic cylinder (2203). The hydraulic cylinder (2203) is fixed to the retainer spokes (402). The inner end of the hydraulic cylinder (2203) is sealed and fitted to the inner wall (404) of the hydraulic cylinder. The outer end of the hydraulic cylinder (2203) is press-fitted to one end of the shaped rubber part (2201). One end of the shaped rubber part (2201) is simultaneously connected to the outer end of the piston pressure ring body (1801) of the clutch piston (18). The other end of the shaped rubber part (2201) is connected to the retainer spokes. The inner wall of (402) is connected, and the cylinder (2203) is provided with a cylinder protrusion (2202) in the middle away from the retainer spoke (402). The rubber lip of the special-shaped rubber part (2201) forms a piston chamber (10) between the piston pressure ring body (1801) of the clutch piston (18) and the cylinder (2203). The piston chamber (10) is connected to the piston chamber oil passage of the planetary gear system (1). The cylinder protrusion (2202) forms a lubricating oil chamber (27) between the special-shaped rubber part (2201), the clutch retainer (4) and the planetary shaft (26). The lubricating oil chamber (27) is connected to the lubricating oil hole (2701) on the inner wall (404) of the cylinder. The return position The outer end of the spring (20) abuts against the stamped protrusion (1802) in the middle of the clutch piston (18), and the inner end of the return spring (20) abuts against the return spring retainer (19). The annular recess (1902) at the inner end of the return spring retainer (19) is limited to the inner wall (404) of the cylinder. The outer wall (1901) of the cylinder at the outer end of the return spring retainer (19) is connected to the clutch piston (18). A balance chamber (11) is formed between the clutch piston (18), the return spring retainer (19), the cylinder (2203), and the inner wall (404) of the cylinder. The balance chamber (11) is connected to the lubricating oil hole (1101) on the inner wall (404) of the cylinder.The inner wall of the outer ring (401) is connected to the corrugated pressure plate (24) and a plurality of alternately arranged pressure plates (16) and friction plates (17), and the corrugated pressure plate (24) is correspondingly arranged with the piston ring body (1801).

2. The composite planetary gear train according to claim 1, characterized in that: The planetary gear train (1) includes a planet carrier (3) and planetary gears (12); a planetary shaft (26) is interference-fitted onto the planet carrier (3), and a planetary gear (12) is fitted on the outer side of the planetary shaft (26).

3. The composite planetary gear train according to claim 2, characterized in that: The planetary carrier (3) includes a fixed arm (301), a planetary carrier spoke (302), and an output shaft (303); the input end of the output shaft (303) is provided with a planetary carrier spoke (302), the planetary carrier spoke (302) is provided with a fixed arm (301) and a planetary shaft (26), the fixed arm (301) is provided with a piston chamber oil passage, and the piston chamber oil passage supplies oil to the clutch assembly (2).

4. A composite planetary gear train according to claim 1, characterized in that: The planetary shaft (26) has a lubricating oil passage inside, which is connected to the lubricating oil chamber (27). The planetary shaft (26) has an oil outlet hole in the middle.

5. A composite planetary gear train according to claim 3, characterized in that: The inner wall of the input end of the output shaft (303) is provided with a bushing (9).

6. A composite planetary gear train according to claim 3, characterized in that: The inner wall of the planetary carrier spokes (302) is provided with a thrust bearing (7).

7. A composite planetary gear train according to claim 3, characterized in that: The outer wall of the output end of the output shaft (303) is fitted with a bearing inner ring (8).

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