A multi-gear transmission

Abstract

The utility model discloses a multi -gearbox of position, including main casing, the main casing is through bearing swing joint with input shaft, output shaft, first transmission shaft and second transmission shaft in, the left and right both ends of output shaft all stretch out the left and right side wall of main casing, the first gear and second gear are fixed on input shaft, the outside wall on the middle part of first transmission shaft and second transmission shaft all form hub portion, the third gear is fixed on first transmission shaft and swing joint with fourth gear, the fifth gear is fixed on second transmission shaft and swing joint with sixth gear and through bearing swing joint with seventh gear and eighth gear, it can deliver the control oil pressure of hydraulic control valve to the corresponding position, make corresponding push the sleeve or the second annular of second push the sleeve and press against or reset to realize the wet clutch structure normal operation on first transmission shaft, second transmission shaft and output shaft, satisfy the gearbox normal use of cross country fork truck with wet clutch structure.

Description

Technical Field

[0001] This utility model relates to the field of power transmission technology, and more specifically to a multi-speed gearbox. Background Technology

[0002] Currently, the gearbox in the drive mechanism of forklifts generally has multiple gears to achieve gear shifting.

[0003] When a wet clutch is installed in the gearbox, hydraulic oil is needed to control the opening and closing of the wet clutch. For a conventional diesel off-road forklift, the engine drives the oil supply pump to provide the corresponding hydraulic oil to the wet clutch so that the wet clutch can open and close normally. The oil supply pump is installed in the gearbox.

[0004] In some existing off-road forklifts, sufficient torque is required. This is achieved by the engine driving a hydraulic pump, which in turn drives a hydraulic motor, which in turn drives the gearbox. Electric off-road forklifts use a high-power motor to increase torque, which then drives the gearbox. These gearboxes lack an oil supply pump, making it impossible to operate the wet clutch mechanism. Therefore, existing off-road forklifts could install an independent hydraulic valve on the outer wall of the gearbox, and use a corresponding hydraulic pump to supply oil to a hydraulic control valve. This control valve would then control the oil flow to the wet clutch within the gearbox, enabling its engagement and disengagement. This requires the gearbox to have a structure compatible with the corresponding hydraulic control valve to ensure proper oil delivery to the wet clutch mechanism. However, current gearboxes lack this structure, failing to meet these requirements. Utility Model Content

[0005] The purpose of this utility model is to overcome the shortcomings of the prior art and provide a multi-gear transmission that can deliver the control oil of the hydraulic control valve to the corresponding position, so that the second annular pressing part of the corresponding push sleeve or the second push sleeve presses against or returns to its original position to realize the normal operation of the wet clutch structure on the first drive shaft, the second drive shaft and the output shaft, thus meeting the normal use of the transmission with wet clutch structure in off-road forklifts.

[0006] The solution of this utility model to the aforementioned technical problem is:

[0007] A multi-speed gearbox includes a main housing, in which an input shaft, an output shaft, a first transmission shaft, and a second transmission shaft are movably connected via bearings, and both ends of the output shaft extend out of the left and right side walls of the main housing.

[0008] A first gear and a second gear are fixed on the input shaft;

[0009] Both the first and second drive shafts have outer hubs formed on their middle outer side walls. The first drive shaft has a third gear fixed and a fourth gear movably connected to it. The second drive shaft has a fifth gear fixed and a sixth gear movably connected to it, and a seventh gear and an eighth gear movably connected to it via bearings.

[0010] The right ends of the fourth and sixth gears are both formed with inner hubs, which are inserted into the outer hubs. Multiple active and passive friction plates are spaced apart and located between the outer and inner hubs. The first and second end plates are located between the outer and inner hubs. The inner teeth of the active friction plates mesh with the outer teeth of the inner hubs. The passive friction plates and the extensions of the outer sides of the first and second end plates are inserted into corresponding slots formed on the outer hubs. All active and passive friction plates are located between the first and second end plates, with the second end plate on the right and the first end plate on the left. Pressure blocks are inserted into the first and second drive shafts, which are inserted into the outer hubs. The pressing part formed on the left end face of the pressure block presses against the right wall of the second end plate. A limit ring is fixed on the inner wall of the left end of the outer hub, and the left side wall of the first end plate faces the limit ring.

[0011] The first and second drive shafts are located on the right side of the outer hub and are inserted into the middle stepped through hole of the connecting part formed inside the main housing. The left end of the middle stepped through hole is a large-diameter hole section and the right end is a small-diameter hole section. The stepped pressing sleeve is inserted into the middle stepped through hole, and the first and second drive shafts are inserted into the corresponding stepped pressing sleeves.

[0012] The small-diameter sleeve portion of the stepped pressing sleeve is inserted into the small-diameter hole section, with its outer side wall tightly against the inner side wall of the small-diameter hole section. The large-diameter sleeve portion of the stepped pressing sleeve is inserted into the large-diameter hole section, with its outer side wall tightly against the inner side wall of the large-diameter hole section. Sealing rings are nested in the annular grooves formed on the inner side walls of both the large-diameter and small-diameter hole sections of the central stepped through hole. The inner side wall of the sealing ring presses against the corresponding outer side wall of the stepped pressing sleeve. The pushing sleeve is inserted at the right side of the first or second drive shaft. The outer side wall of the pushing sleeve is movably connected to the inner side wall of the corresponding large-diameter sleeve portion of the stepped pressing sleeve via a bearing. An annular pressing portion is formed at the left end of the pushing sleeve, and multiple pushing... The push post is inserted into the through hole formed on the right side plate of the corresponding outer hub. The left end of the push post extends out of the left end of the through hole and presses against the right end face of the pressure block. Multiple positioning holes are formed on the right end face of the large diameter sleeve of the stepped pressure sleeve. The positioning holes correspond to the second positioning holes formed on the right end face of the large diameter hole section of the middle stepped through hole. The positioning pin is inserted into the corresponding positioning hole and the second positioning hole. Two first oil inlet holes are formed on the rear wall of the main housing. The inner end of the first oil inlet hole extends into the corresponding connecting part and communicates with the oil outlet hole formed on the right end face of the large diameter hole section of the middle stepped through hole. The left end of the oil outlet hole faces the corresponding groove on the right end face edge of the large diameter hole section of the stepped pressure sleeve.

[0013] Limiting rings and reset springs are fixed on the outer side walls of the middle portion of the first and second drive shafts. The limiting rings and reset springs are located in the corresponding inner hubs. One end of the reset spring is applied to the right end face of the limiting ring, and the other end is applied to the left end face of the pressure block.

[0014] The output shaft is fixed with a ninth gear and a tenth gear, and movably connected to an eleventh gear via a bearing. A second outer hub is fixed to the left end of the eleventh gear. An external toothed portion is formed on the outer wall of the middle section of the output shaft corresponding to the second outer hub. Multiple active and driven friction plates are spaced apart and positioned between the second outer hub and the external toothed portion. The internal teeth on the inner side of the active friction plates mesh with the external teeth. The outer extension of the driven friction plates is inserted into a corresponding slot formed on the second outer hub. The output shaft on the right side of the external toothed portion... A limiting end plate is fixed on the output shaft. The left end face of the limiting end plate is located on the right end face of the rightmost active friction plate or driven friction plate. A second stepped pressing sleeve is inserted into the output shaft on the left side of the external tooth. The output shaft is inserted into the second middle stepped through hole of the second connecting part formed inside the main housing. The right end of the second stepped pressing sleeve is a large-diameter sleeve part, the middle part is a middle sleeve part, and the left end is a small-diameter sleeve part. The outer diameter of the large-diameter sleeve part is larger than that of the middle sleeve part, and the outer diameter of the middle sleeve part is larger than that of the small-diameter sleeve part.

[0015] The small-diameter sleeve portion of the second-step pressing sleeve is inserted into the small-diameter hole section, with its outer side wall tightly against the inner side wall of the small-diameter hole section. The middle sleeve portion of the second-step pressing sleeve is inserted into the large-diameter hole section, with its outer side wall tightly against the inner side wall of the large-diameter hole section. A sealing ring is nested in the annular groove formed on the inner side wall of both the large-diameter hole section and the small-diameter hole section of the second middle-step through hole. The inner side wall of the sealing ring presses against the outer side wall of the corresponding position of the second-step pressing sleeve. The large-diameter sleeve portion is located on the right side of the second connecting portion.

[0016] The second push sleeve is inserted into the output shaft on the left side of the external tooth. The outer wall of the second push sleeve is movably connected to the inner wall of the large-diameter sleeve of the corresponding second stepped pressing sleeve through a bearing. A second annular pressing part is formed on the outer wall of the right end of the second push sleeve. The right side wall of the second annular pressing part faces the left end face of the leftmost active friction plate or driven friction plate. An annular groove is formed on the inner wall of the right end of the second push sleeve. The second return spring is inserted into the output shaft and is located in the annular groove. Its left end is applied to the left end face of the annular groove and its right end is applied to the left end face of the external tooth. Multiple positioning holes are formed on the left end face of the large-diameter sleeve of the second stepped pressing sleeve. The positioning holes correspond to the corresponding recesses formed on the right end face of the second connecting part. The second positioning pin is inserted into the corresponding positioning holes and recesses.

[0017] The outstanding effect of this utility model is:

[0018] Compared with existing technologies, it can deliver the control oil of the hydraulic control valve to the corresponding position, so that the second annular pressing part of the corresponding push sleeve or the second push sleeve presses against or returns to its original position, thereby realizing the normal operation of the wet clutch structure on the first drive shaft, the second drive shaft and the output shaft, and meeting the normal use of the gearbox with wet clutch structure of the off-road forklift driven by the hydraulic motor. Attached Figure Description

[0019] Figure 1 This is a partial structural schematic diagram of the present invention;

[0020] Figure 2 yes Figure 1 A magnified view of a portion of the image;

[0021] Figure 3 yes Figure 1 A magnified view of another part;

[0022] Figure 4 yes Figure 1 There are also some enlarged partial images. Detailed Implementation

[0023] For example, see below. Figures 1 to 4As shown, a multi-speed gearbox includes a main housing 10; an input shaft 20, an output shaft 30, a first transmission shaft 40, and a second transmission shaft 50 are movably connected in the main housing 10 via bearings, and the left and right parts of the input shaft 20, output shaft 30, first transmission shaft 40, and second transmission shaft 50 are movably connected to the left side plate and right side plate of the main housing 10 via bearings.

[0024] Both ends of the output shaft 30 extend out of the left and right side walls of the main housing 10; the left and right ends of the output shaft 30 serve as power output.

[0025] The left and right ends of the input shaft 20 are each formed with a connecting hole in the middle. The inner sidewall of the connecting hole is formed with a connecting spline groove. The left and right ends of the input shaft 20 are inserted into the middle through holes of the input motor seat 109 fixed on the left and right side plates of the main housing 10. The output shaft of the drive motor can be inserted into the corresponding connecting hole, and the external spline protrusion of the output shaft can be inserted into the connecting spline groove to achieve a fit. Thus, the input shaft 20 can be driven to rotate by the operation of the drive motor.

[0026] The input shaft 20 is fixed with a first gear 1 and a second gear 2;

[0027] Both the first drive shaft 40 and the second drive shaft 50 have an outer hub 41 formed on the middle outer side wall. The first drive shaft 40 has a third gear 3 fixed on it and a fourth gear 4 movably connected thereto. The second drive shaft 50 has a fifth gear 5 fixed on it and a sixth gear 6 movably connected thereto. The seventh gear 7 and the eighth gear 8 are movably connected through bearings. The eighth gear 8 and the seventh gear 7 are fixed together.

[0028] The output shaft 30, the first transmission shaft 40 and the second transmission shaft 50 are all equipped with wet clutch structures.

[0029] The wet clutch structure of the first drive shaft 40 and the second drive shaft 50 is as follows: the right ends of the fourth gear 4 and the sixth gear 6 are both formed with inner hub portions 42, which are inserted into the outer hub portion 41. Multiple active friction plates 100 and driven friction plates 200 are spaced apart and located between the outer hub portion 41 and the inner hub portion 42 (the spacing is set such that there is one driven friction plate 200 between every two active friction plates 100 or one active friction plate 100 between every two driven friction plates 200). The first end plate 43 and the second end plate 44 are located between the outer hub portion 41 and the inner hub portion 42. The internal teeth of the active friction plates 100 and the external teeth of the inner hub portion 42 are connected. The driven friction plate 200, the outer extensions of the first end plate 43 and the second end plate 44 are inserted into corresponding slots formed on the outer hub 41. All the driving friction plates 100 and driven friction plates 200 are located between the first end plate 43 and the second end plate 44, with the second end plate 44 on the right end and the first end plate 43 on the left end. Pressing blocks 45 are inserted into both the first drive shaft 40 and the second drive shaft 50. The pressing blocks 45 are inserted into the outer hub 41. The pressing part formed on the left end face edge of the pressing block 45 presses against the right wall of the second end plate 44. A limiting ring 46 is fixed on the inner side wall of the left end of the outer hub 41. The left side wall of the first end plate 43 faces the limiting ring 46.

[0030] The first drive shaft 40 and the second drive shaft 50 are located on the right side of the outer hub 41 and are inserted into the middle stepped through hole of the connecting part 11 formed inside the main housing 10. The left end of the middle stepped through hole is a large diameter hole section and the right end is a small diameter hole section. The stepped pressing sleeve 12 is inserted into the middle stepped through hole, and the first drive shaft 40 and the second drive shaft 50 are inserted into the corresponding stepped pressing sleeve 12.

[0031] The small-diameter sleeve portion of the stepped pressing sleeve 12 is inserted into the small-diameter hole section, with its outer side wall tightly against the inner side wall of the small-diameter hole section. The large-diameter sleeve portion of the stepped pressing sleeve 12 is inserted into the large-diameter hole section, with its outer side wall tightly against the inner side wall of the large-diameter hole section. Sealing rings are nested in the annular grooves formed on the inner side walls of both the large-diameter and small-diameter hole sections of the central stepped through hole. The inner side wall of the sealing ring presses against the corresponding outer side wall of the stepped pressing sleeve 12. The pushing sleeve 13 is inserted into the right side of the first drive shaft 40 or the second drive shaft 50. The outer side wall of the pushing sleeve 13 is movably connected to the inner side wall of the corresponding large-diameter sleeve portion of the stepped pressing sleeve 12 via a bearing. An annular pressing portion is formed at the left end of the pushing sleeve 13, and multiple pushing posts 131 are formed on the left side wall of the annular pressing portion. The column 131 is inserted into the through hole formed on the side plate of the right end of the corresponding outer hub 41. The left end of the column 131 is pushed out of the left end of the through hole and pressed against the right end face of the pressure block 45. Multiple positioning holes are formed on the right end face of the large diameter sleeve of the stepped pressing sleeve 12. The positioning holes correspond to the second positioning holes formed on the right end face of the large diameter hole section of the middle stepped through hole. The positioning pin 121 is inserted into the corresponding positioning hole and the second positioning hole. Two first oil inlet holes 15 are formed on the rear wall of the main housing 10. The inner end of the first oil inlet hole 15 extends into the corresponding connecting part 11 and communicates with the oil outlet hole 16 formed on the right end face of the large diameter hole section of the middle stepped through hole. The left end of the oil outlet hole 16 faces the corresponding groove on the right end face edge of the large diameter hole section of the stepped pressing sleeve 12.

[0032] Furthermore, a limiting ring and a return spring 17 are fixed on the outer side wall of the middle part of the first drive shaft 40 and the second drive shaft 50, respectively. The limiting ring and the return spring 17 are located in the corresponding inner hub 42. One end of the return spring 17 is applied to the right end face of the limiting ring, and the other end is applied to the left end face of the pressure block 45.

[0033] Furthermore, the fourth gear 4 and the sixth gear 6 are both movably connected to the first drive shaft 40 and the second drive shaft 50 via needle roller and cage assemblies.

[0034] Furthermore, the wet clutch structure of the output shaft 30 is as follows: a ninth gear 9 and a tenth gear 101 are fixed on the output shaft 30, and an eleventh gear 102 is movably connected via bearings. A second outer hub 31 is fixed to the left end of the eleventh gear 102. An external toothed portion 32 is formed on the outer wall of the middle portion of the output shaft 30 corresponding to the second outer hub 31. Multiple active friction plates 100 and driven friction plates 200 are spaced apart and located between the second outer hub 31 and the external toothed portion 32 (the spacing is configured such that a driven friction plate 200 is provided between every two active friction plates 100, or an active friction plate 100 is provided between every two driven friction plates 200). The internal teeth on the inner side of the active friction plate 100 mesh with the external toothed portion 32, and the driven friction plate 200... The outer extension of 00 is inserted into the corresponding slot formed on the second outer hub 31. A limiting end plate 33 is fixed on the output shaft 30 on the right side of the outer tooth 32. The left end face of the limiting end plate 33 is on the right end face of the rightmost active friction plate 100 or driven friction plate 200 (in this embodiment, the rightmost is the active friction plate 100). A second stepped pressing sleeve 35 is inserted on the output shaft 30 on the left side of the outer tooth 32. The output shaft 30 is inserted into the second middle stepped through hole of the second connecting part 18 formed inside the main housing 10. The right end of the second stepped pressing sleeve 35 is a large diameter sleeve part, the middle part is a middle sleeve part, and the left end is a small diameter sleeve part. The outer diameter of the large diameter sleeve part is larger than that of the middle sleeve part, and the outer diameter of the middle sleeve part is larger than that of the small diameter sleeve part.

[0035] Furthermore, the second-step pressing sleeve 35 is inserted into the second middle step through hole;

[0036] The small-diameter sleeve portion of the second-step pressing sleeve 35 is inserted into the small-diameter hole section, with its outer side wall tightly attached to the inner side wall of the small-diameter hole section. The middle sleeve portion of the second-step pressing sleeve 35 is inserted into the large-diameter hole section, with its outer side wall tightly attached to the inner side wall of the large-diameter hole section. A sealing ring is nested in the annular groove formed on the inner side wall of both the large-diameter hole section and the small-diameter hole section of the second middle-step through hole. The inner side wall of the sealing ring presses against the outer side wall of the corresponding position of the second-step pressing sleeve 35. The large-diameter sleeve portion is located on the right side of the second connecting portion 18.

[0037] The second push sleeve 37 is inserted into the output shaft 30 on the left side of the external toothed part 32. The outer side wall of the second push sleeve 37 is movably connected to the inner side wall of the large diameter sleeve part of the corresponding second stepped pressing sleeve 35 through a bearing. A second annular pressing part is formed on the outer side wall of the right end of the second push sleeve 37. The right side wall of the second annular pressing part faces the left end face of the leftmost active friction plate 100 or driven friction plate 200 (in this embodiment, the leftmost is the active friction plate 100). An annular groove is formed on the inner side wall of the right end of the second push sleeve 37. The second return spring 38 is inserted into the output shaft 30 and is located in the annular groove. Its left end is applied to the left end face of the annular groove and its right end is applied to the left end face of the external toothed part 32. Multiple positioning holes are formed on the left end face of the large diameter sleeve part of the second stepped pressing sleeve 35. The positioning holes correspond to the corresponding concave holes formed on the right end face of the second connecting part 18. The second positioning pin is inserted into the corresponding positioning holes and concave holes.

[0038] Furthermore, a second oil inlet hole 103 is formed on the rear wall surface of the main housing 10. The inner end of the second oil inlet hole 103 extends into the corresponding second connecting part 18 and communicates with the second oil outlet hole 104 formed on the left end face of the large diameter hole section of the corresponding second middle stepped through hole. The right end of the second oil outlet hole 104 faces the corresponding groove on the left end face edge of the middle sleeve part of the second stepped pressing sleeve 35.

[0039] Furthermore, the first gear 1 meshes with the third gear 3, the first gear 1 meshes with the fifth gear 5, the second gear 2 meshes with the eighth gear 8, the fourth gear 4 meshes with the tenth gear 101, the sixth gear 6 meshes with the ninth gear 9, and the seventh gear 7 meshes with the eleventh gear 102.

[0040] In this embodiment, a hydraulic control valve can be fixed on the outer wall of the main housing 10. The corresponding oil outlet is connected to the corresponding first oil inlet 15 or second oil inlet 103. During operation, after the oil enters the corresponding first oil inlet 15 or second oil inlet 103, the operation of the corresponding wet clutch structure can be realized. The specific principle is that when oil enters the first oil inlet 15, the oil will push the corresponding stepped pressure sleeve 12 to the left, causing the push sleeve 13 to move to the left. The push column 131 drives the pressure block 45. Moving to the left causes all corresponding active friction plates 100 and driven friction plates 200 to press against each other, thereby causing the first drive shaft 40 to drive the fourth gear 4 to rotate synchronously, or the second drive shaft 50 to drive the sixth gear 6 to rotate synchronously. When the oil at the hydraulic control valve stops being added, the elastic return of the return spring 17 causes the corresponding active friction plates 100 and driven friction plates 200 to separate, so that the first drive shaft 40 will not drive the fourth gear 4 to rotate, or the second drive shaft 50 will not drive the sixth gear 6 to rotate.

[0041] Similarly, when oil enters the second oil inlet 103, the oil will push the corresponding second stepped pressing sleeve 35 to the right, causing the second pushing sleeve 37 to move to the right and its second annular pressing part to move to the right, so that all the corresponding active friction plates 100 and driven friction plates 200 press against each other, thereby causing the output shaft 30 to rotate synchronously with the eleventh gear 102. When the oil at the hydraulic control valve stops being added, the elastic recovery of the second return spring 38 causes the corresponding active friction plates 100 and driven friction plates 200 to separate, so that the output shaft 30 will not drive the eleventh gear 102 to rotate synchronously.

[0042] This embodiment has a three-speed shifting structure. For forward and reverse rotation, it only requires the drive motor connected to the input shaft 20 to rotate forward, which means moving forward, and the drive motor to rotate in reverse, which means moving backward.

[0043] Its specific principle is as follows:

[0044] In first gear, the input shaft 20 operates, causing the first gear 1 to rotate, which in turn drives the fifth gear 5 to rotate. The rotation of the fifth gear 5 then drives the second transmission shaft 50 to rotate. At this time, the driving friction plate 100 and the driven friction plate 200 of the second transmission shaft 50 press against each other, which drives the sixth gear 6 to rotate. The sixth gear 6 drives the ninth gear 9 to rotate, which in turn drives the output shaft 30 to rotate (under normal circumstances, the corresponding driving friction plate 100 and driven friction plate 200 are separate).

[0045] In second gear, the input shaft 20 operates, causing the first gear 1 to rotate, which in turn drives the third gear 3 to rotate. The rotation of the third gear 3 then drives the first transmission shaft 40 to rotate. At this time, the driving friction plate 100 and the driven friction plate 200 of the first transmission shaft 40 press against each other, which drives the fourth gear 4 to rotate. The fourth gear 4 drives the tenth gear 101 to rotate, which in turn drives the output shaft 30 to rotate.

[0046] In third gear, the input shaft 20 operates, causing the second gear 2 to rotate, which in turn drives the eighth gear 8 to rotate, which in turn drives the seventh gear 7 to rotate. The seventh gear 7 drives the eleventh gear 102 to rotate, while the driving friction plate 100 and the driven friction plate 200 of the output shaft 30 press against each other, thus driving the input shaft 20 to rotate.

[0047] Finally, the above embodiments are only used to illustrate the present utility model and are not intended to limit the present utility model. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present utility model. Therefore, all equivalent technical solutions also fall within the scope of the present utility model, and the patent protection scope of the present utility model should be defined by the claims.

Claims

1. A multi-gear transmission, comprising a main housing (10); characterized in that: The main housing (10) is movably connected by bearings to an input shaft (20), an output shaft (30), a first transmission shaft (40), and a second transmission shaft (50). Both ends of the output shaft (30) extend out of the left and right side walls of the main housing (10). The output shaft (30), the first transmission shaft (40), and the second transmission shaft (50) are all equipped with wet clutch structures; The first drive shaft (40) and the second drive shaft (50) are located on the right side of the outer hub (41) of the wet clutch structure and are inserted into the middle stepped through hole of the connecting part (11) formed inside the main housing (10). The left end of the middle stepped through hole is a large diameter hole section and the right end is a small diameter hole section. The stepped pressing sleeve (12) is inserted into the middle stepped through hole, and the first drive shaft (40) and the second drive shaft (50) are inserted into the corresponding stepped pressing sleeve (12). The small-diameter sleeve part of the stepped pressing sleeve (12) is inserted into the small-diameter hole section, and its outer side wall is close to the inner side wall of the small-diameter hole section. The large-diameter sleeve part of the stepped pressing sleeve (12) is inserted into the large-diameter hole section, and its outer side wall is close to the inner side wall of the large-diameter hole section. The annular groove formed on the inner side wall of the large-diameter hole section and the small-diameter hole section of the middle stepped through hole is nested with a sealing ring. The inner side wall of the sealing ring is pressed against the outer side wall of the corresponding position of the stepped pressing sleeve (12). The push sleeve (13) is inserted into the right side of the first drive shaft (40) or the second drive shaft (50). The outer side wall of the push sleeve (13) is movably connected to the inner side wall of the large-diameter sleeve part of the corresponding stepped pressing sleeve (12) through a bearing. The left end of the push sleeve (13) is formed with an annular pressing part. Multiple push posts (131) are formed on the left side wall of the annular pressing part. 31) The push pin (131) is inserted into the through hole formed on the side plate of the right end of the corresponding outer hub (41). The left end of the push pin (131) extends out of the left end of the through hole and presses against the right end face of the pressure block (45). Multiple positioning holes are formed on the right end face of the large diameter sleeve of the stepped pressing sleeve (12). The positioning holes correspond to the second positioning holes formed on the right end face of the large diameter hole section of the middle stepped through hole. The positioning pin (121) is inserted into the corresponding positioning hole and the second positioning hole. Two first oil inlet holes (15) are formed on the rear wall of the main housing (10). The inner end of the first oil inlet hole (15) extends into the corresponding connecting part (11) and communicates with the oil outlet hole (16) formed on the right end face of the large diameter hole section of the middle stepped through hole. The left end of the oil outlet hole (16) faces the corresponding groove on the right end face edge of the large diameter hole section of the stepped pressing sleeve (12).

2. A multi-gear transmission according to claim 1, characterized in that: The input shaft (20) is fixed with a first gear (1) and a second gear (2); Both the first drive shaft (40) and the second drive shaft (50) have an outer hub (41) formed on the middle outer side wall. The first drive shaft (40) has a third gear (3) fixed on it and a fourth gear (4) movably connected thereto. The second drive shaft (50) has a fifth gear (5) fixed on it and a sixth gear (6) movably connected thereto. The seventh gear (7) and the eighth gear (8) are movably connected thereto through bearings. The right ends of the fourth gear (4) and the sixth gear (6) are both formed with inner hubs (42), which are inserted into the outer hub (41). Multiple active friction plates (100) and driven friction plates (200) are spaced apart and located between the outer hub (41) and the inner hub (42). The first end plate (43) and the second end plate (44) are located between the outer hub (41) and the inner hub (42). All active friction plates (100) and driven friction plates (200) are located between the first end plate (43) and the second end plate (44). The first drive shaft (40) and the second drive shaft (50) are both fitted with pressure blocks (45), which are inserted into the outer hub (41). The pressure block (45) is formed on the left end face edge of the pressure block (45) and presses against the right wall of the second end plate (44).

3. A multi-gear transmission according to claim 2, characterized in that: Limiting rings and reset springs (17) are fixed on the outer side walls of the middle part of the first drive shaft (40) and the second drive shaft (50). The limiting rings and reset springs (17) are located in the corresponding inner hub (42). One end of the reset spring (17) is applied to the right end face of the limiting ring, and the other end is applied to the left end face of the pressure block (45). The fourth gear (4) and the sixth gear (6) are both movably connected to the first drive shaft (40) and the second drive shaft (50) via needle rollers and cage assemblies.

4. A multi-gear transmission according to claim 3, characterized in that: The left and right ends of the input shaft (20) are both formed with connecting holes in the middle. The inner sidewall of the connecting hole is formed with a connecting spline groove. The left and right ends of the input shaft (20) are inserted into the middle through holes of the input motor seat (109) fixed on the left and right side plates of the main housing (10).

5. A multi-gear transmission according to claim 4, characterized in that: The output shaft (30) is fixed with a ninth gear (9), a tenth gear (101), and an eleventh gear (102) connected movably by bearings. The left end of the eleventh gear (102) is fixed with a second outer hub (31) of a wet clutch structure. An external tooth (32) is formed on the middle outer wall of the output shaft (30) corresponding to the second outer hub (31). Multiple active friction plates (100) and driven friction plates (200) are spaced apart and located between the second outer hub (31) and the external tooth (32). A limit end plate (33) is fixed on the output shaft (30) to the right of the external tooth (32). The left end face of the limiting end plate (33) is located on the right end face of the rightmost active friction plate (100) or driven friction plate (200). A second stepped pressing sleeve (35) is inserted on the output shaft (30) at the left side of the external tooth part (32). The output shaft (30) is inserted into the second middle stepped through hole of the second connecting part (18) formed inside the main housing (10). The right end of the second stepped pressing sleeve (35) is a large diameter sleeve part, the middle part is a middle sleeve part, and the left end is a small diameter sleeve part. The outer diameter of the large diameter sleeve part is larger than that of the middle sleeve part, and the outer diameter of the middle sleeve part is larger than that of the small diameter sleeve part.

6. A multi-gear transmission according to claim 4, characterized in that: The second-step pressing sleeve (35) is inserted into the second middle step through hole; The small-diameter sleeve part of the second stepped pressing sleeve (35) is inserted into the small-diameter hole section, and its outer side wall is close to the inner side wall of the small-diameter hole section. The middle sleeve part of the second stepped pressing sleeve (35) is inserted into the large-diameter hole section, and its outer side wall is close to the inner side wall of the large-diameter hole section. The annular groove formed on the inner side wall of the large-diameter hole section and the small-diameter hole section of the second middle stepped through hole is nested with a sealing ring. The inner side wall of the sealing ring is pressed against the outer side wall of the corresponding position of the second stepped pressing sleeve (35). The large-diameter sleeve part is located on the right side of the second connecting part (18). The second push sleeve (37) is inserted into the output shaft (30) on the left side of the external toothed part (32). The outer wall of the second push sleeve (37) is movably connected to the inner wall of the large-diameter sleeve part of the corresponding second stepped pressing sleeve (35) through a bearing. A second annular pressing part is formed on the outer wall of the right end of the second push sleeve (37). The right side wall of the second annular pressing part faces the left end face of the leftmost active friction plate (100) or driven friction plate (200). An annular groove is formed on the inner side wall at the right end of the output shaft (30). The second return spring (38) is inserted into the output shaft (30) and is located in the annular groove. Its left end is applied to the left end face of the annular groove and its right end is applied to the left end face of the external tooth part (32). Multiple positioning holes are formed on the left end face of the large diameter sleeve part of the second step pressing sleeve (35). The positioning holes correspond to the corresponding concave holes formed on the right end face of the second connecting part (18). The second positioning pin is inserted into the corresponding positioning holes and concave holes. A second oil inlet hole (103) is formed on the rear wall surface of the main housing (10). The inner end of the second oil inlet hole (103) extends into the corresponding second connecting part (18) and communicates with the second oil outlet hole (104) formed on the left end face of the large diameter hole section of the corresponding second middle stepped through hole. The right end of the second oil outlet hole (104) faces the corresponding groove on the left end face edge of the middle sleeve part of the second stepped pressing sleeve (35).

7. A multi-gear transmission according to claim 6, characterized in that: The first gear (1) meshes with the third gear (3), the first gear (1) meshes with the fifth gear (5), the second gear (2) meshes with the eighth gear (8), the fourth gear (4) meshes with the tenth gear (101), the sixth gear (6) meshes with the ninth gear (9), and the seventh gear (7) meshes with the eleventh gear (102).

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