Face gear planetary multi-gear variable transmission system

Abstract

The invention discloses a face gear planetary multi-gear variable transmission system, which belongs to the field of gear transmission, and comprises a first-stage face gear planetary gear train, a second-stage face gear planetary gear train, a one-way clutch and a friction clutch, the first-stage face gear planetary gear train comprises a cylindrical gear I, a planet carrier I, a face gear I, a face gear II, a face gear IV, a face gear V and a face gear VI; the second-stage face gear planetary gear train comprises a second cylindrical gear, a second planet carrier, a seventh face gear, an eighth face gear, a ninth face gear, an eleventh face gear and a twelfth face gear. The transmission system adopts a multi-stage face gear nesting structure to realize multi-gear speed change, and the face gears mutually rotate through bearings. Gear shifting is achieved through combination and separation of the one-way clutch and the multi-piece type friction clutch. The multi-gear transmission mechanism has the advantages of being high in contact ratio, high in bearing capacity, free of anti-dislocation design and accurate in shunting, the number of parts is greatly reduced while multi-gear transmission is achieved, and the structure is more compact.

Description

Technical Field

[0001] The invention belongs to the field of gear transmission, and in particular relates to a face gear planetary multi-speed transmission system used for a power shift transmission of a tractor or engineering machinery. Background Art

[0002] The power shift transmission can achieve shifting without interrupting power output under load by controlling the torque transmission between multiple groups of wet friction clutches. It has the characteristics of easy shifting process, high power uninterrupted operation performance, high work efficiency, etc., and has a moderate initial cost. It is widely used in large and medium-sized tractors, heavy-duty vehicles, construction machinery, etc. Power shift can be divided into two categories: planetary type and fixed axis type according to the working principle of gears. At present, power shift transmissions mostly use 12F+12R, 16F+8R and other gears, which cannot cover the use requirements of various working conditions, and there are disadvantages such as large transmission volume, complex transmission system structure, and inconvenient space layout. Therefore, it is necessary to innovate the design of the transmission system.

[0003] In the prior art, Chinese patent application number CN202110197653.3 discloses a variable speed transmission system; Chinese patent application number CN202410106146.8 discloses an 8+8 gear variable speed transmission system and a tractor having the same; Chinese patent application number CN202311757275.5 discloses a variable speed transmission system. However, the related art still has the following deficiencies:

[0004] 1. Transmission is carried out through cylindrical gears, the transmission system is complex and has many parts.

[0005] 2. The number of gears is relatively small, which makes it difficult to meet the needs of various complex working conditions. Summary of the invention

[0006] Purpose of the invention: In order to overcome the defects of volume and weight of previous transmission systems, the present invention provides a lightweight face gear planetary multi-speed transmission system, which can reduce the number of parts, reduce weight and system complexity, and improve reliability while achieving more gear transmission.

[0007] Technical solution: To achieve the above purpose, the technical solution adopted by the present invention is:

[0008] A face gear planetary multi-speed transmission system comprises a first-stage face gear planetary gear train, a second-stage face gear planetary gear train and a gear box.

[0009] The first-stage face gear planetary gear train includes cylindrical gear 1, planet carrier 1, and face gear 1, face gear 2, face gear 4, face gear 5, and face gear 6 that are meshed and transmission-connected with cylindrical gear 1. The face gear 1 is transmission-connected with the input shaft through a one-way clutch 1, and the face gear 2 is transmission-connected with the input shaft through a friction clutch 1. The cylindrical gear 1 is transmission-connected with the planet carrier 1, and the face gear 4, face gear 5, and face gear 6 are respectively connected to the gear box through brakes.

[0010] The second-stage face gear planetary gear train includes cylindrical gear 2, planet carrier 2, and face gear 7, face gear 8, face gear 9, face gear 11, and face gear 12 that are meshed and transmission-connected with cylindrical gear 2. The cylindrical gear 2 is transmission-connected with planet carrier 2, and the face gear 8, face gear 9, face gear 11, and face gear 12 are respectively connected to the gear box through brakes. The face gear 7 is transmission-connected with face gear 6 through friction clutch 2, and the face gear 7 is transmission-connected with planet carrier 1 through one-way clutch 2.

[0011] Preferably: the face gear 4 is connected to the gear box through brake 1, the face gear 5 is connected to the gear box through brake 2, and the face gear 6 is connected to the gear box through brake 3. The face gear 8 is connected to the gear box through brake 4, the face gear 9 is connected to the gear box through brake 5, the face gear 11 is connected to the gear box through brake 6, and the face gear 12 is connected to the gear box through brake 7.

[0012] Preferably: the face gear 1 and face gear 2 are located on one side of cylindrical gear 1, and the face gear 4, face gear 5, and face gear 6 are located on the other side of cylindrical gear 1. The face gear 7 and face gear 8 are located on one side of cylindrical gear 2, and the face gear 7, face gear 8, and face gear 9 are located on the other side of cylindrical gear 2.

[0013] Preferably, the face gear 1 and the face gear 2 are nested with each other along the radial direction using bearings, and the face gear 4, the face gear 5 and the face gear 6 are nested with each other along the radial direction using bearings.

[0014] Preferably, the face gear seven, the face gear eight and the face gear nine are nested with each other along the radial direction using bearings, and the face gear eleven and the face gear twelve are nested with each other along the radial direction using bearings.

[0015] Preferably: when the clutch 1, the clutch 2 and the brake 1 are working, the face gear 1, the cylindrical gear 1 and the face gear 4 form a set of planetary gear trains, according to the formula for calculating the transmission ratio of the epicyclic gear train:

[0016]

[0017] in, It represents the gear ratio of the gear train from face gear 1 to face gear 4, Z4 represents the number of teeth of face gear 4, Z1 represents the number of teeth of face gear 1, i 13 It indicates the transmission ratio from face gear one to cylindrical gear one.

[0018] Preferably: when the clutch 1, the friction clutch 2 and the brake 1 are working, the face gear 1, the cylindrical gear 1, the face gear 4 and the face gear 6 form a set of planetary gear trains, according to the calculation formula of the transmission ratio of the epicyclic gear train:

[0019]

[0020] in, Indicates the gear ratio of the gear train from face gear 1 to face gear 6, i 16 It represents the transmission ratio of face gear one to cylindrical gear six, Z6 represents the number of teeth of face gear six, Z4 represents the number of teeth of face gear four, and Z1 represents the number of teeth of face gear one.

[0021] Preferably, the cylindrical gear 1 and the cylindrical gear 2 are spur gears, helical gears or herringbone gears.

[0022] Preferably, the face gear 1, face gear 2, face gear 4, face gear 5, face gear 6, face gear 7, face gear 8, face gear 9, face gear 11 and face gear 12 are spur gears, helical gears or herringbone gears.

[0023] Preferably, the friction clutch 1 and the friction clutch 2 are dry friction clutches or wet friction clutches.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] This transmission system uses a multi-stage face gear nesting structure to achieve multi-speed shifting, and the face gears use bearings to achieve mutual rotation. Gear shifting is achieved by the engagement and disengagement of the one-way clutch and the multi-plate friction clutch. This transmission system uses a main and auxiliary two-stage face gear planetary gear system. The first-stage main face gear planetary gear system can achieve (6+4) gears, and the second-stage auxiliary face gear planetary gear system can achieve (2+2) gears. The two stages work together to achieve 40 gears. This device uses face gear transmission, which has the advantages of high overlap, strong load-bearing capacity, no need for anti-misalignment design and precise diversion. Compared with traditional planetary and fixed-axis types, the face gear transmission used in this solution can achieve more gear transmission while greatly reducing the number of parts and making the structure more compact. 。 BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the main structural principle of the present invention.

[0027] Figure 2 It is a schematic diagram of the face gear planetary gear train of the present invention.

[0028] Figure 3 It is a schematic diagram of the nested structure of the multi-stage face gears of the present invention.

[0029] Figure 4 It is a schematic diagram of the output power flow of the planet carrier of the first-stage face gear planetary gear system of the present invention.

[0030] Figure 5 It is a schematic diagram of the output power flow of the face gear 6 of the first-stage face gear planetary gear train of the present invention.

[0031] Figure 6 This is the relationship between the transmission ratios of the first-stage face gear planetary gear train and the number of teeth on each gear.

[0032] Figure 7 It is a schematic diagram of power flow of the second-stage face gear planetary gear system of the present invention.

[0033] Figure 8 It is the transmission ratio of each level of the second-stage face gear planetary gear train. DETAILED DESCRIPTION

[0034] The present invention is further explained below in conjunction with the accompanying drawings and specific embodiments. It should be understood that these examples are only used to illustrate the present invention and are not used to limit the scope of the present invention. After reading the present invention, various equivalent forms of modifications to the present invention by those skilled in the art all fall within the scope defined by the claims attached to this application.

[0035] A face gear planetary multi-speed transmission system, such as Figure 1 As shown, it includes a first-stage face gear planetary gear train, a second-stage face gear planetary gear train, a one-way clutch 1 301, a one-way clutch 2 302, a friction clutch 1 201, a friction clutch 202, and a gearbox 14. The first-stage face gear planetary gear train is a main face gear planetary gear train, and the second-stage face gear planetary gear train is a secondary face gear planetary gear train.

[0036] The first-stage face gear planetary gear system includes face gear 1, face gear 2, face gear 4, face gear 5, face gear 6, cylindrical gear 1, planet carrier 16, brake 101, brake 2 102, and brake 3 103. The face gear 1 and face gear 2 are mutually nested with bearings in the radial direction, and the face gear 4, face gear 5, and face gear 6 are mutually nested with bearings in the radial direction. The face gear 1 is connected to the input shaft 13 through a one-way clutch 301, and the face gear 2 is connected to the input shaft 13 through a friction clutch 201. The face gear 1 and face gear 2 are located on one side of the cylindrical gear 3, and the face gear 4, face gear 5, and face gear 6 are located on the other side of the cylindrical gear 3. The face gear 1, face gear 2, face gear 4, face gear 5, and face gear 6 are meshed and connected with the cylindrical gear 3, and the cylindrical gear 3 is connected to the planet carrier 16. The face gear four 4, face gear five 5, and face gear six 6 are connected to the gear box 14 via brakes, respectively. Specifically, the face gear four 4 is connected to the gear box 14 via brake one 101, the face gear five 5 is connected to the gear box 14 via brake two 102, and the face gear six 6 is connected to the gear box 14 via brake three 103.

[0037] The first-stage face gear planetary gear train uses the left and right face gears 1, 2, 4, 5, and 6 as center gears, the left face gears 1 and 2 as input components, and the planet carrier 16 and the right face gear 6 as output components. Figure 2 As shown. The cylindrical gear 13 is used as a planetary gear. Driven by the face gear 1 and face gear 2 at the left end, the planetary gear (cylindrical gear 13) can not only rotate around the planet carrier, but also revolve. Figure 2 shown.

[0038] The two coaxial face gears 1 and 2 on the left can be selectively combined with the input shaft 13. The two coaxial face gears 1 and 2 are radially nested with each other using bearings and can rotate relative to each other. Figure 3 As shown. The modulus and pressure angle of each face gear are consistent with the middle planetary gear, and the middle planetary gear is used as a component for transmitting motion and power; the face gear 4, face gear 5, and face gear 6 on the right side can be selectively connected to the housing 14 through the brake 101, the brake 2 102, and the brake 3 103. The planet carrier 16 and the face gear 6 6 can achieve selective output through the friction clutch 202 and the one-way clutch 2 302. Through the cooperation of the clutch and the brake, 10 speed gears can be realized, as follows:

[0039] 1. Power is input from the input shaft 13, and drives the face gear 1 to rotate together through the one-way clutch 1 301, and then passes through the cylindrical gear 1 3. When the brake 101 works, the face gear 1, the cylindrical gear 1 3 and the face gear 4 4 form a set of planetary gear trains, and the one-way clutch 2 302 works. The cylindrical gear 1 3 drives the planet carrier 1 16 to revolve under the driving force of self-rotation, and the motion will be transmitted from the planet carrier 1 16 to the face gear 7 7. Similarly, when the brake 2 102 and the brake 3 103 work, the face gear 1, the cylindrical gear 1 3 and the face gear 5 5 and the face gear 6 6 respectively form a planetary gear train.

[0040] 2. Similarly, when the friction clutch 1 201 is engaged and the brake 1 101 is working, the face gear 2 2, the cylindrical gear 1 3 and the face gear 4 4 form a planetary gear train. Similarly, when the brake 2 102 and the brake 3 103 are working, the face gear 2 2, the cylindrical gear 1 3 and the face gear 5 5 and the face gear 6 6 respectively form a planetary gear train. Figure 4 shown.

[0041] 3. When the one-way clutch 2 302 is engaged, the face gear 6 6 is used as the output to control the friction clutch 1 201 and the one-way clutch 1 301 as well as the brake 1 101 and the brake 2 102 to work, the power transmission path becomes: face gear 1 1 / face gear 2 2 → cylindrical gear 1 3 → face gear 4 4 / face gear 5 5 → face gear 6 6. The transmission path is as follows: Figure 5 shown.

[0042] When the one-way clutch 1 301, the one-way clutch 2 302 and the brake 101 are working, the face gear 1, the cylindrical gear 1 3 and the face gear 4 4 form a set of planetary gear trains, and the planet carrier 16 is used as an output member. According to the calculation formula of the transmission ratio of the epicyclic gear train:

[0043]

[0044] in, Indicates the gear ratio of the conversion gear from face gear 1 to face gear 4, n 1 Indicates the speed of face gear 1, n 3 Indicates the speed of gear three, n 4 represents the speed of face gear 4, Z4 represents the number of teeth of face gear 4, Z1 represents the number of teeth of face gear 1, i 13 It indicates the transmission ratio from face gear one to cylindrical gear one.

[0045] For example, when the clutches 301, 202 and the brake 101 are working, the face gear 1, the planetary gear 3, the face gear 4 and the face gear 6 form a set of planetary gear trains, and the face gear 6 is used as an output member. According to the formula for calculating the transmission ratio of the epicyclic gear train:

[0046]

[0047] Depend on You can get:

[0048]

[0049] Substituting into the above formula, we can get:

[0050]

[0051] in, Indicates the gear ratio of the gear train from face gear 1 to face gear 6, n 6 Indicates the sixth speed of the face gear, i 16 It represents the transmission ratio of face gear one to cylindrical gear six, Z6 represents the number of teeth of face gear six, Z4 represents the number of teeth of face gear four, and Z1 represents the number of teeth of face gear one.

[0052] The calculation of the transmission ratios of the remaining stages is similar. The relationship between the transmission ratios of the first-stage face gear planetary gear train and the number of teeth on each gear is as follows: Figure 6 As shown in the figure, B1 represents brake 101, B2 represents brake 2 102, B3 represents brake 3 103, C1 represents one-way clutch 1 301, C2 represents one-way clutch 2 302, F1 represents friction clutch 1 201, F2 represents friction clutch 2 202, ● represents working, and ○ represents not working.

[0053] The second-stage face gear planetary gear train includes face gear seven 7, face gear eight 8, face gear nine 9, face gear eleven 11, face gear twelve 12, cylindrical gear two 10, planet carrier two 15, brake four 104, brake five 105, brake six 106, brake seven 107. The face gear seven 7, face gear eight 8, face gear nine 9 are mutually nested with bearings along the radial direction, the face gear eleven 11, face gear twelve 12 are mutually nested with bearings along the radial direction, the face gear seven 7, face gear eight 8 are located on one side of cylindrical gear two 10, the face gear seven 7, face gear eight 8, face gear nine 9 are located on the other side of cylindrical gear two 10, and the face gear seven 7, face gear eight 8, face gear nine 9, face gear eleven 11, face gear twelve 12 are meshed and transmission-connected with cylindrical gear two 10, and the cylindrical gear two 10 is transmission-connected with planet carrier two 15. The face gear eight 8, face gear nine 9, face gear eleven 11 and face gear twelve 12 are respectively connected to the gearbox 14 through brakes. Specifically, the face gear eight 8 is connected to the gearbox 14 through brake four 104, the face gear nine 9 is connected to the gearbox 14 through brake five 105, the face gear eleven 11 is connected to the gearbox 14 through brake six 106, and the face gear twelve 12 is connected to the gearbox 14 through brake seven 107.

[0054] The face gear 77 is connected to the face gear 66 through the friction clutch 202, and the face gear 77 is connected to the planet carrier 16 through the one-way clutch 202. Specifically, the planet carrier 16 is connected to the input side of the one-way clutch 202, and the face gear 77 is connected to the output side of the one-way clutch 202. The face gear 66 is connected to the input side of the friction clutch 202, and the face gear 77 is connected to the output side of the friction clutch 202.

[0055] The second-stage face gear planetary gear train is arranged with four brakes 104, five brakes 105, six brakes 106, and seven brakes 107. The left face gear seven 7 is connected to the output shaft of the previous stage to input power, the cylindrical gear two 10 is used as a planetary gear, and the planet carrier two 15 is used as an output. The left face gear eight 8 and face gear nine 9 can provide reverse speed through brake four 104 and brake five 105, and the right face gear eleven 11 and face gear twelve 12 can be selectively braked by brake six 106 and brake seven 107 respectively, and can provide two positive speed ratios, such as Figure 7 Through the cooperation of clutch and brake, 4 speed gears can be realized, as follows:

[0056] 1) Power is input from the intermediate shaft to drive face gear seven 7. When brake four 104 and brake five 105 work respectively, face gear seven 7, cylindrical gear two 10 and face gear eight 8 (face gear nine 9) form a planetary gear train, and planet carrier two 15 outputs reverse speed to achieve reverse gear.

[0057] 2) When brake six 106 and brake seven 107 work respectively, face gear seven 7, cylindrical gear two 10 and face gear eleven 11 (face gear twelve 12) form a planetary gear train, and planet carrier two 1 outputs two positive rotation speeds.

[0058] The relationship between the transmission ratios of the second-stage face gear planetary gear train and the number of teeth on each gear is as follows: Figure 8 As shown in the figure, B4 represents brake four 104, B5 represents brake five 105, B6 represents brake six 106, and B7 represents brake seven 107.

[0059] The left and right end face gears adopt a multi-stage face gear nesting structure to achieve multi-speed shifting, rolling bearings are used between the face gears to achieve mutual rotation, and gear shifting is achieved by the engagement and disengagement of a one-way clutch and a multi-plate friction clutch.

[0060] The face gear planetary multi-speed transmission system adopts a main and auxiliary face gear planetary gear train. The first-stage main face gear planetary gear train can achieve (6+4) gears, and the second-stage auxiliary face gear planetary gear train can achieve (2+2) gears. The two stages cooperate with each other to achieve 40 gears.

[0061] The cylindrical gear 1 3 and cylindrical gear 2 10 can be in various forms such as spur gears, helical gears or herringbone gears. The face gear 1 1, face gear 2 2, face gear 4 4, face gear 5 5, face gear 6 6, face gear 7 7, face gear 8 8, face gear 9 9, face gear 11 11 and face gear 12 12 can also be in various forms such as spur gears, helical gears or herringbone gears.

[0062] The friction clutch 1 201 and the friction clutch 2 202 are various forms such as dry friction clutches or wet friction clutches.

[0063] This transmission system adopts face gear planetary transmission as the main transmission form, with face gears at the left and right ends as center wheels, cylindrical gears as planetary wheels, and four planetary wheels evenly distributed on the circumference. This transmission system adopts a multi-stage face gear nesting structure to achieve multi-speed shifting, and the face gears use bearings to achieve mutual rotation. Gear shifting is achieved by the engagement and disengagement of the one-way clutch and the multi-plate friction clutch. This transmission system adopts a main and auxiliary two-stage face gear planetary gear train. The first-stage face gear planetary gear train can achieve (6+4) gears, and the second-stage face gear planetary gear train can achieve (2+2) gears. The two stages can achieve 40 gears by working together. This transmission system adopts face gear transmission, which has the advantages of high overlap, strong load-bearing capacity, no need for anti-misalignment design and precise diversion. Compared with traditional planetary and fixed-axis types, the face gear transmission adopted by this transmission system can achieve more gear transmission while greatly reducing the number of parts and making the structure more compact.

[0064] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A face gear planetary multi-speed transmission system, characterized in that: It comprises a first-stage face gear planetary gear train, a second-stage face gear planetary gear train, and a gear box (14); The first-stage face gear planetary gear train comprises a cylindrical gear 1 (3), a planet carrier 1 (16), and a face gear 1 (1), a face gear 2 (2), a face gear 4 (4), a face gear 5 (5), and a face gear 6 (6) which are respectively meshed and transmission-connected with the cylindrical gear 1 (3); the face gear 1 (1) is transmission-connected to the input shaft (13) via a one-way clutch 1 (301), and the face gear 2 (2) is transmission-connected to the input shaft (13) via a friction clutch 1 (201); the cylindrical gear 1 (3) is transmission-connected to the planet carrier 1 (16), and the face gear 4 (4), the face gear 5 (5), and the face gear 6 (6) are respectively connected to the gear box (14) via brakes; The second-stage face gear planetary gear train comprises cylindrical gear 2 (10), planet carrier 2 (15), and face gear 7 (7), face gear 8 (8), face gear 9 (9), face gear 11 (11), and face gear 12 (12) which are respectively meshed and transmission-connected with cylindrical gear 2 (10); the cylindrical gear 2 (10) is transmission-connected with planet carrier 2 (15); the face gear 8 (8), face gear 9 (9), face gear 11 (11), and face gear 12 (12) are respectively connected with a gear box (14) through a brake; the face gear 7 (7) is transmission-connected with face gear 6 (6) through a friction clutch 2 (202); and the face gear 7 (7) is transmission-connected with planet carrier 1 (16) through a one-way clutch 2 (302).

2. The face gear planetary multi-speed transmission system according to claim 1, characterized in that: The face gear four (4) is connected to the gear box (14) through the brake one (101), the face gear five (5) is connected to the gear box (14) through the brake two (102), and the face gear six (6) is connected to the gear box (14) through the brake three (103); the face gear eight (8) is connected to the gear box (14) through the brake four (104), the face gear nine (9) is connected to the gear box (14) through the brake five (105), the face gear eleven (11) is connected to the gear box (14) through the brake six (106), and the face gear twelve (12) is connected to the gear box (14) through the brake seven (107).

3. The face gear planetary multi-speed transmission system according to claim 2, characterized in that: The face gear 1 (1) and the face gear 2 (2) are located on one side of the cylindrical gear 1 (3), and the face gear 4 (4), the face gear 5 (5), and the face gear 6 (6) are located on the other side of the cylindrical gear 1 (3); the face gear 7 (7) and the face gear 8 (8) are located on one side of the cylindrical gear 2 (10), and the face gear 7 (7), the face gear 8 (8), and the face gear 9 (9) are located on the other side of the cylindrical gear 2 (10).

4. The face gear planetary multi-speed transmission system according to claim 3, characterized in that: The face gear 1 (1) and the face gear 2 (2) are nested together in the radial direction using bearings, and the face gear 4 (4), the face gear 5 (5) and the face gear 6 (6) are nested together in the radial direction using bearings.

5. The face gear planetary multi-speed transmission system according to claim 4, characterized in that: The face gear seven (7), face gear eight (8), and face gear nine (9) are nested together in the radial direction using bearings, and the face gear eleven (11) and face gear twelve (12) are nested together in the radial direction using bearings.

6. The face gear planetary multi-speed transmission system according to claim 5, characterized in that: When the clutch 1 (301), the clutch 2 (302) and the brake 1 (101) are working, the face gear 1 (1), the cylindrical gear 1 (3) and the face gear 4 (4) form a set of planetary gear trains. According to the formula for calculating the transmission ratio of the epicyclic gear train: in, It represents the gear ratio of the gear train from face gear 1 to face gear 4, Z4 represents the number of teeth of face gear 4, Z1 represents the number of teeth of face gear 1, i 13 It indicates the transmission ratio from face gear one to cylindrical gear one.

7. The face gear planetary multi-speed transmission system according to claim 6, characterized in that: When the clutch 1 (301), the friction clutch 2 (202) and the brake 1 (101) are working, the face gear 1 (1), the cylindrical gear 1 (3), the face gear 4 (4) and the face gear 6 (6) form a set of planetary gear trains. According to the formula for calculating the transmission ratio of the epicyclic gear train: in, Indicates the gear ratio of the gear train from face gear 1 to face gear 6, i 16 It represents the transmission ratio of face gear one to cylindrical gear six, Z6 represents the number of teeth of face gear six, Z4 represents the number of teeth of face gear four, and Z1 represents the number of teeth of face gear one.

8. The face gear planetary multi-speed transmission system according to claim 7, characterized in that: The cylindrical gear one (3) and cylindrical gear two (10) are spur gears, helical gears or herringbone gears.

9. The face gear planetary multi-speed transmission system according to claim 8, characterized in that: The face gear 1 (1), face gear 2 (2), face gear 4 (4), face gear 5 (5), face gear 6 (6), face gear 7 (7), face gear 8 (8), face gear 9 (9), face gear 11 (11) and face gear 12 (12) are spur gears, helical gears or herringbone gears.

10. The face gear planetary multi-speed transmission system according to claim 9, characterized in that: The friction clutch 1 (201) and the friction clutch 2 (202) are dry friction clutches or wet friction clutches.

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