Planetary gear train and clutch assembly

Abstract

The utility model discloses a planetary gear train and clutch assembly, and belongs to the technical field of automatic transmissions. The clutch radial plate is connected with the planetary gear train, a lubricating oil guide unit and a clutch piston are arranged in the clutch retainer, an oil channel is formed between the oil cylinder and the clutch radial plate, a piston cavity is formed among the rubber part, the piston pressing ring and the oil cylinder, and a return spring retainer and a return spring are arranged at the inner end of the spring supporting seat. A balance cavity is formed among the clutch piston, the return spring retainer and the oil cylinder; the inner wall of the outer ring is connected with a wave-shaped pressure plate and a plurality of pressure plates and friction plates which are alternately arranged one by one, and the wave-shaped pressure plate corresponds to the piston pressing ring. The clutch is simple in structure, small in size, reasonable in design, compact in arrangement, high in execution efficiency and optimal in configuration, is provided with reasonable lubrication and oil cavity pressurization oil ways, is easy to machine, can be combined according to requirements, and can transmit and cut off power according to requirements.

Description

Technical Field

[0001] The utility model relates to a planetary gear train and a clutch assembly, belonging to the technical field of automatic transmissions. Background Art

[0002] An automatic transmission is a device that switches gears to an appropriate shift gear according to the driving state of a vehicle.

[0003] Generally, an automatic transmission includes at least one planetary gear set having a sun gear, an internal gear ring, and a planet carrier as operating members, and a friction plate assembly of friction members such as clutches and brakes for controlling the operating members. According to each shift gear, the clutches and brakes are controlled to engage or disengage through the operation of a hydraulic control system, thereby achieving each shift gear.

[0004] The clutch of the friction member transmits the power of the engine to the operating member of the planetary gear set, or transmits power between the operating members. The clutch can be used to transmit power in various machinery and automatic transmissions. The clutch includes a piston, a plurality of pressure plates, and a plurality of friction plates alternately arranged with the plurality of pressure plates. When hydraulic pressure is supplied to the piston, the pressure plates move to contact the friction plates, and finally the shift gear is changed to the target shift position. When the hydraulic pressure is released from the piston, through the action of a return spring, etc., the piston returns to the initial position, the pressure plates move to separate from the friction plates through a reaction plate, etc., and finally the operating member is released.

[0005] However, there is currently a lack of a planetary gear train and a clutch assembly for an automatic transmission that are multi-gear, miniaturized, and lightweight to meet the current production requirements of small volume and light mass. Summary of the Utility Model

[0006] To solve the problems in the background art, the utility model provides a planetary gear train and a clutch assembly.

[0007] To achieve the above object, the present utility model adopts the following technical solution: A planetary gear train and a clutch assembly, including a planetary gear train and a clutch assembly. The clutch assembly includes a clutch cage, a pressure plate, a friction plate, a clutch piston, a return spring cage, a return spring, a lubricating oil guiding unit, and a corrugated pressure plate. The clutch cage includes an outer ring and clutch spokes. The output end of the clutch spokes is connected to the input end of the planetary gear train. A lubricating oil guiding unit and a clutch piston are provided inside the clutch cage. The lubricating oil guiding unit includes an oil baffle, a rubber part, and an oil cylinder. The clutch piston includes a spring support seat and a piston retaining ring. One end of the oil cylinder adjacent to the clutch spokes is provided with an oil cylinder protrusion, and the oil cylinder protrusion is fixedly connected to the clutch spokes in a fitting manner, so that an oil passage is formed between the oil cylinder and the clutch spokes. The inner end of the oil cylinder is press-fitted with the oil baffle, the outer end of the oil cylinder is press-fitted with the rubber part, the rubber part is connected to the inner wall of the clutch spokes, and a piston chamber is formed between the rubber lip of the rubber part, the piston retaining ring, and the oil cylinder. The inner end of the spring support seat is provided with a return spring cage and a return spring. The outer end of the return spring abuts against the inner end of the spring support seat, and the inner end of the return spring abuts against the return spring cage. The inner end of the return spring cage is limited by the oil cylinder, and the outer end of the return spring cage is connected to the spring support seat. A balance chamber is formed among the clutch piston, the return spring cage, and the oil cylinder. The inner wall of the outer ring is connected to the corrugated pressure plate and a plurality of alternately arranged pressure plates and friction plates. The corrugated pressure plate is correspondingly arranged with the piston retaining ring.

[0008] The planetary gear train includes a planet carrier, planetary gears, and planetary shafts. The planet carrier is inserted with planetary shafts, and planetary gears are sleeved on the outer sides of the planetary shafts.

[0009] The planet carrier includes a fixed arm, planet carrier spokes, and an output shaft. The input end of the output shaft is provided with planet carrier spokes. The planet carrier spokes are provided with a fixed arm and planetary shafts. A piston chamber oil passage is provided inside the fixed arm, and the piston chamber oil passage supplies oil to the clutch assembly.

[0010] A lubricating oil passage is provided inside the planetary shaft, and the lubricating oil passage is communicated with the oil passage. An oil outlet hole is provided in the middle of the planetary shaft.

[0011] A bushing is provided on the inner wall of the input end of the output shaft.

[0012] A thrust bearing is provided on the inner wall of the planet carrier spokes.

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

[0014] The utility model has a simple structure and a small volume. It has a reasonable lubrication and oil chamber pressurization oil circuit, is easy to process, the clutch can be combined as required, can transmit and cut off power as required, is reasonably designed, compactly arranged, has high execution efficiency, and has an optimal configuration. Brief Description of the Drawings

[0015] Figure 1 is a schematic structural diagram of the utility model;

[0016] Figure 2 is a schematic structural diagram of the clutch cage. Detailed Embodiment

[0017] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0018] A planetary gear train and a clutch assembly, comprising a planetary gear train 1 and a clutch assembly 2. The clutch assembly 2 includes a clutch cage 4, a pressure plate 16, a friction plate 17, a clutch piston 18, a return spring cage 20, a return spring 21, a lubricating oil guiding unit 23, and a corrugated pressure plate 25. The clutch cage 4 includes an outer ring 401 and a clutch web 402 which are vertically welded and fixed. The welds of the outer ring 401 and the clutch web 402 are not a circle but several arcs, and the number thereof is determined by the number of fixed arms 301. The output end of the clutch web 402 is connected to the input end of the fixed arm 301 of the planetary gear train 1 by welding to form a weld 6. Inside the clutch cage 4, a lubricating oil guiding unit 23 and a clutch piston 18 are arranged along its axial direction. The lubricating oil guiding unit 23 includes an oil baffle 2301, a rubber part 2302, and an oil cylinder 2303. The clutch piston 18 includes a spring support seat 1801 and a piston compression ring 1802 which are press-fitted. One end of the oil cylinder 2303 adjacent to the clutch web 402 is provided with an oil cylinder protrusion 2304, and the oil cylinder protrusion 2304 is fixedly connected to the clutch web 402 by riveting. After riveting, the two become an integral body and will not separate under torsion, vibration, oil pressure, etc., so that an oil passage 29 is formed between the oil cylinder 2303 and the clutch web 402. The inner end of the oil cylinder 2303 is press-fitted with the oil baffle 2301, and the outer end of the oil cylinder 2303 is press-fitted with the rubber part 2302. The rubber part 2302 is connected to the inner wall of the clutch web 402. A piston chamber 10 is formed between the rubber lip of the rubber part 2302, the piston compression ring 1802, the inner rubber ring 22, and the oil cylinder 2303. The piston chamber 10 is not completely sealed. There is an oil hole in the oil cylinder 2303, and the oil hole is communicated with the piston chamber oil passage. After the piston chamber oil inlet hole 1001 is filled with oil, the piston chamber 10 can maintain pressure. In order to avoid leakage due to gaps between different parts, a sealing ring 24 is added at the oil hole.

[0019] During installation, the inner rubber ring 22 is first installed in the machined annular groove of the piston compression ring 1802, and then the clutch piston 18 is installed in the oil cylinder 2303.

[0020] The inner end of the spring support seat 1801 is provided with a return spring cage 20 and a return spring 21. The outer end of the return spring 21 abuts against the inner end of the spring support seat 1801, and the inner end of the return spring 21 abuts against the return spring cage 20. The inner end of the return spring cage 20 is axially limited by the boss structure of the oil cylinder 2303, and the outer end of the return spring cage 20 is connected to the spring support seat 1801 by an outer rubber ring 19. A balance chamber 11 is formed among the clutch piston 18, the return spring cage 20, and the oil cylinder 2303.

[0021] The lubricating oil enters the balance chamber 11 through the oil hole 1101 on the oil cylinder 2303. Under the action of centrifugal force, the forces on both sides of the clutch piston 18 can be balanced, facilitating the control of the system oil pressure.

[0022] The inner wall of the outer ring 401 is connected to the corrugated pressure plate 25, and a plurality of pressure plates 16 and friction plates 17 arranged alternately one by one, and is axially limited by an elastic retaining ring 26; there are trapezoidal teeth formed by cold extrusion on the inner side of the outer ring 401, and the corrugated pressure plate 25 and the pressure plate 16 have formed outer trapezoidal teeth, and the outer ring 401 forms a key connection with the corrugated pressure plate 25 and the pressure plate 16. The inner side of the friction plate 17 has formed trapezoidal teeth, which cooperate with the trapezoidal teeth of the mating part to form a key connection. When there is power input, the corrugated pressure plate 25, the pressure plate 16, and the friction plate 17 are closely attached to each other, and the power can be transmitted to the clutch cage 4 and then transmitted to the output shaft 303 side. The corrugated pressure plate 25 is correspondingly arranged with the piston pressure ring 1802;

[0023] The planetary gear train 1 includes a planet carrier 3, planetary gears 13, and planetary shafts 28; the planet carrier 3 is the main part of the planetary gear train 1. The planetary shafts 28 are inserted into the planet carrier 3. The outer sides of the planetary shafts 28 are sleeved with planetary gears 13 through needle bearings 14, and thrust washers 15 are sleeved on both ends of the outer sides of the planetary shafts 28, and the thrust washers 15 are attached to both ends of the planetary gears 13.

[0024] The planet carrier 3 includes a fixed arm 301, a planet carrier web 302, and an output shaft 303 formed by integral forging. This process method has high structural strength and occupies less space; the input end of the output shaft 303 is provided with a planet carrier web 302, which provides support for the planetary shafts 28 through the planet carrier web 302. The fixed arm 301 and the planetary shafts 28 are provided on the planet carrier web 302. Specifically, a shaft hole 27 is machined on the planet carrier web 302, and one end of the planetary shaft 28 is press-fitted into the shaft hole 27. A crescent-shaped step 2701 is machined at the outer end of the shaft hole 27. When assembling the planetary shaft 28, the crescent-shaped step 2701 plays a limiting role, and the connected planetary shaft 28 and the planet carrier 3 become an integral body, so that the planetary shaft 28 and the planet carrier 3 will not slide relative to each other when working under torsion. The fixed arm 301 is provided with a piston chamber oil circuit, and the piston chamber oil circuit supplies oil to the clutch assembly 2 through the piston chamber oil circuit oil inlet hole 1001.

[0025] The fixed arm 301, the planet carrier web 302, and the output shaft 303 are respectively machined with oil holes, and several oil holes are connected to each other, which can ensure that the ATF oil flows smoothly through them. The plug 7 and the bowl-shaped plug piece 9 are process plugs for ensuring the structural seal, which can ensure that the ATF oil reaches the desired position after flowing in from the piston chamber oil circuit oil inlet hole 1001.

[0026] The interior of the planetary shaft 28 is provided with a lubricating oil passage 2801, which is communicatively connected with the oil passage 29. An oil outlet hole is provided in the middle of the planetary shaft 28. Under the action of gravity and centrifugal force, the lubricating oil flows into the lubricating oil passage 2801 through the oil passage 29, and then lubricates the needle roller bearing 14 and the planetary gear 13 to avoid ablation of parts during operation. The ideal oil supply position is the center of the needle roller bearing 16.

[0027] A bushing 12 is provided on the inner wall of the input end of the output shaft 303 to facilitate the positioning of adjacent parts.

[0028] A thrust bearing 8 is provided on the inner wall of the spoke plate 302 of the planet carrier to facilitate the positioning of adjacent parts.

[0029] A part of the clutch cage serves as the spoke plate of the planet carrier, which saves materials, shortens the length of the component structure, and improves the stiffness. At the same time, the outer diameter part of the clutch cage is designed to be a pure circle, which can reduce the stirring loss of the oil when there is more external lubricating oil and improve the operation efficiency.

[0030] The oil passage hole is opened inside the planet carrier, and the structure is utilized more fully. There is no need to additionally increase the structure to provide the oil passage, which saves space and cost.

[0031] When the transmission system is running, the ATF oil can reach the needle roller bearing through the cavity to continuously provide lubrication. The planetary shaft and the planet carrier shaft hole are designed to be in an interference fit, which can prevent the planetary shaft from coming out and rotating. In this way, there is no need for caulking fixation after assembly, nor is it necessary to add axial limit parts such as snap rings, which reduces the cost. When the clutch needs to provide power, the pressure oil can reach the piston cavity through the oil inlet hole of the piston cavity oil passage. The pressure oil pushes the piston to make multiple pressure plates and friction plates fit tightly, so that the power can be transmitted to the planet carrier through parts such as the pressure plate, friction plate, and clutch cage, and the power is finally output from the output shaft position.

[0032] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above-mentioned exemplary embodiments, and the present utility model can be implemented in other forms without departing from the spirit or basic characteristics of the present utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent conditions of the claims are intended to be included in the present utility model. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0033] In addition, it should be understood that although this specification is described in terms of embodiments, not every embodiment contains only one independent technical solution. This narrative style of the specification is only for clarity. Those skilled in the art should regard 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 planetary gear train and clutch assembly, characterized in that: The invention comprises a planetary gear train (1) and a clutch assembly (2), wherein the clutch assembly (2) comprises a clutch holder (4), a pressure plate (16), a friction plate (17), a clutch piston (18), a return spring holder (20), a return spring (21), a lubricating oil guide unit (23) and a corrugated pressure plate (25); the clutch holder (4) comprises an outer ring (401) and a clutch spoke (402) which are fixed by vertical welding; the output end of the clutch spoke (402) is connected to the input end of the planetary gear train (1), and a lubricating oil guide unit is provided in the clutch holder (4). The invention relates to a clutch piston (18), wherein the lubricating oil guide unit (23) comprises an oil baffle plate (2301), a rubber member (2302) and an oil cylinder (2303); the clutch piston (18) comprises a spring support seat (1801) and a piston pressure ring (1802); an oil cylinder protrusion (2304) is provided at one end of the oil cylinder (2303) adjacent to the clutch spoke plate (402); the oil cylinder protrusion (2304) is fitted and fixedly connected to the clutch spoke plate (402), so that an oil passage (29) is formed between the oil cylinder (2303) and the clutch spoke plate (402), and the oil The inner end of the cylinder (2303) is in interference fit with the oil baffle plate (2301), the outer end of the oil cylinder (2303) is in interference fit with the rubber member (2302), the rubber member (2302) is connected to the inner wall of the clutch spoke (402), a piston cavity (10) is formed between the rubber lip of the rubber member (2302), the piston pressure ring (1802) and the oil cylinder (2303), the inner end of the spring support seat (1801) is provided with a return spring retainer (20) and a return spring (21), the outer end of the return spring (21) is in abutment with the inner end of the spring support seat (1801), and the return spring (21) is in abutment with the inner end of the spring support seat (1801). The inner end of the return spring retainer (21) is abutted against the return spring retainer (20), the inner end of the return spring retainer (20) is limited by the oil cylinder (2303), the outer end of the return spring retainer (20) is connected to the spring support seat (1801), and a balance chamber (11) is formed between the clutch piston (18), the return spring retainer (20) and the oil cylinder (2303); the inner wall of the outer ring (401) is connected to the corrugated pressure plate (25) and a plurality of pressure plates (16) and friction plates (17) arranged alternately one by one, and the corrugated pressure plate (25) and the piston pressure ring (1802) are arranged correspondingly.

2. A planetary gear train and clutch assembly according to claim 1, characterized in that: The planetary gear train (1) comprises a planet carrier (3), planetary gears (13) and a planetary shaft (28); the planetary shaft (28) is interference-inserted on the planet carrier (3), and the planetary gears (13) are sleeved on the outer side of the planetary shaft (28).

3. A planetary gear train and clutch assembly according to claim 2, characterized in that: The planet carrier (3) comprises a fixed arm (301), a planet carrier spoke plate (302) and an output shaft (303); the input end of the output shaft (303) is provided with a planet carrier spoke plate (302); the planet carrier spoke plate (302) is provided with a fixed arm (301) and a planet shaft (28); a piston chamber oil circuit is provided in the fixed arm (301); and the piston chamber oil circuit supplies oil to the clutch assembly (2).

4. A planetary gear train and clutch assembly according to claim 2, characterized in that: A lubricating oil passage (2801) is provided inside the planetary shaft (28), the lubricating oil passage (2801) is connected to the oil passage (29), and an oil outlet hole is provided in the middle of the planetary shaft (28).

5. A planetary gear train and clutch assembly according to claim 3, characterized in that: The inner wall of the input end of the output shaft (303) is provided with a bushing (12).

6. A planetary gear train and clutch assembly according to claim 3, characterized in that: The inner wall of the planet carrier spoke plate (302) is provided with a thrust bearing (8).

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