A parallel fixed-axis power shift gearbox

Abstract

The present invention discloses a parallel fixed-axis power shift transmission, including an input shaft system, a first intermediate shaft system, a second intermediate shaft system, a fixed-axis output shaft system, and a planetary gear; the rotation center lines of the input shaft, the fixed-axis output shaft, and the planetary frame are installed on the same straight line, so that the input and output are coaxial. It also includes an ECU control unit, and the hydraulic power driven clutch friction plate and steel plate coupling controlled by the ECU control unit, the first clutch, the second clutch, the third clutch, the fourth clutch, and the fifth clutch; any two of them are combined to obtain six speed ratios; this solution optimizes the number of gears and the gear arrangement according to the operating conditions of the fracturing operation, so that the control difficulty is reduced, the gear shifting is smooth, and a larger speed ratio range is provided. The fixed-axis gear transmission is easier to maintain than the planetary transmission.

Description

Technical Field

[0001] The invention belongs to the field of an industrial gearbox in an oil and gas production fracturing system, and relates to a parallel fixed-axis power shift gearbox. Background Art

[0002] Oil and gas fracturing operations use high-flow, high-pressure hydraulics to fracture the underlying rock to form cracks and increase pores, thereby increasing oil and gas production. In order to obtain high-pressure hydraulics, the engine output power is decelerated and torque-increased through the gearbox to drive the fracturing pump to pump the mixed water into the well.

[0003] The transmission used in the fracturing pump system is a heavy-duty transmission, which includes a fixed-axis transmission and a planetary transmission. Most of them are modified from the transmissions of heavy-duty vehicles such as engineering vehicles, which cannot meet the requirements of fracturing operations well and have some problems in use. Planetary transmissions have achieved a large number of gears, but the gears used in fracturing operations are relatively limited, and gear shifting is not frequent. Too many gears increase the control difficulty and cost; the planetary reducer is also relatively difficult to maintain in terms of service life. The output power of the fracturing system is very large. Regardless of whether it is a fixed-axis transmission or a planetary transmission, the directly modified heavy-duty vehicle transmission cannot match the requirements of fracturing operation conditions well. Fracturing operations urgently need a professional transmission with small shift flow fluctuations, smooth shifting, and a large speed ratio range. Summary of the invention

[0004] The purpose of the present invention is to provide a parallel fixed-axis power shift transmission to solve the above-mentioned problems.

[0005] The technical solution adopted by the present invention is as follows:

[0006] A parallel fixed-axis power shift transmission comprises an input shaft system, a first intermediate shaft system, a second intermediate shaft system, a fixed-axis output shaft system, and a planetary gear;

[0007] The input shaft system is composed of an input shaft, a No. 1 driving gear, a No. 3 driving gear and a No. 3 clutch; the No. 1 driving gear is fixedly connected to the input shaft, and the No. 3 driving gear is an idler gear; the No. 1 driving gear and the No. 3 driving gear are connected as a whole through the No. 3 clutch, and when the No. 3 clutch is engaged, the No. 1 driving gear and the No. 3 driving gear are fixedly connected as a whole, and rotate as a whole and transmit power, and when the No. 3 clutch is not engaged, the No. 1 driving gear and the No. 3 driving gear do not interfere with each other and rotate separately;

[0008] The first intermediate shaft system is composed of the first intermediate shaft, the first driven gear, the second driving gear, the third driven gear, the fourth driving gear, the fifth driven gear, the sixth driving gear, the second clutch and the fourth clutch; the first driven gear and the second driving gear are empty double gears; the second driving gear and the third driven gear are connected as a whole through the second clutch. When the second clutch is engaged, the second driving gear and the third driven gear are fixedly connected as a whole, rotate as a whole and transmit power. When the second clutch is not engaged, the second driving gear and the third driven gear do not interfere with each other and rotate separately; the fourth driving gear and the fifth driven gear are connected through the fourth clutch. When the fourth clutch is engaged, the fourth driving gear and the fifth driven gear are fixedly connected as a whole, rotate as a whole and transmit power. When the fourth clutch is not engaged, the fourth driving gear and the fifth driven gear do not interfere with each other and rotate separately

[0009] The second intermediate shaft system is composed of the second intermediate shaft, the second driven gear, the fourth driven gear, the fifth driving gear, the first clutch and the fifth clutch; the second driven gear and the fifth driving gear are both idler gears; the second driven gear and the fourth driven gear are connected as a whole through the first clutch, when the first clutch is engaged, the second driven gear and the fourth driven gear are fixedly connected as a whole and rotate and transmit power as a whole, when the first clutch is not engaged, the second driven gear and the fourth driven gear do not interfere with each other and rotate separately; the fourth driven gear and the fifth driving gear are connected as a whole through the fifth clutch, when the fifth clutch is engaged, the fourth driven gear and the fifth driving gear are fixedly connected as a whole and rotate and transmit power as a whole, when the fifth clutch is not engaged, the fourth driven gear and the fifth driving gear do not interfere with each other and rotate separately;

[0010] The fixed-axis output shaft system is composed of a fixed-axis output shaft and a No. 6 driven gear, and the fixed-axis output shaft is fixedly connected to the No. 6 driven gear;

[0011] The planetary gear set is composed of a sun gear, a planet carrier, a planetary gear and an inner gear ring; the sun gear is connected to the fixed output shaft, and the inner gear ring is fixed on the box frame, so the planetary gear set only serves to increase the transmission ratio and increase the output torque;

[0012] The first driving gear meshes with the first driven gear, the second driving gear meshes with the second driven gear, the third driving gear meshes with the third driven gear, the fourth driving gear meshes with the fourth driven gear, the fifth driving gear meshes with the fifth driven gear, and the sixth driving gear meshes with the sixth driven gear.

[0013] The transmission of a fracturing truck has a large load-bearing power. A pure planetary transmission is difficult to realize and has a complex structure, while a fixed-axis transmission is easier to realize. The purpose of the present invention is to propose a six-speed ratio power shift transmission for a fracturing truck. In combination with the difficulty of realization and the load-bearing requirements, a fixed-axis transmission scheme is adopted at the high-speed end to facilitate gear matching, and a planetary gearbox is used at the low-speed end to increase the distance to improve the load-bearing capacity. The invention has an appropriate number of gears, a strong load-bearing capacity, a compact structure, and high transmission efficiency.

[0014] Furthermore, as a preferred solution: the rotation center lines of the input shaft, the fixed-axis output shaft and the planet carrier are installed on the same straight line, so that the input and output are coaxial.

[0015] Further, as a preferred solution: it also includes an ECU control unit, and the hydraulic power controlled by the ECU control unit drives the clutch friction plate and steel plate to couple, and any two of the clutch No. 1, clutch No. 2, clutch No. 3, clutch No. 4 and clutch No. 5 are combined to obtain a six-speed ratio.

[0016] The first gear transmission route is: when the No. 1 clutch and the No. 4 clutch are engaged, and the other clutches are not engaged, the No. 2 driven gear and the No. 4 driven gear, the No. 4 driving gear and the No. 5 driven gear are fixedly connected as a whole and rotate and transmit power as a whole. The power is input from the input shaft, passes through the No. 1 driving gear and the No. 1 driven gear, the No. 2 driving gear and the No. 2 driven gear, the No. 4 driven gear and the No. 4 driving gear, the No. 6 driving gear and the No. 6 driven gear, the planetary gear, and finally output by the planetary carrier;

[0017] The second gear transmission route is as follows: when the No. 1 clutch and the No. 5 clutch are engaged, and the other clutches are not engaged, the No. 2 driven gear and the No. 4 driven gear, the No. 4 driven gear and the No. 5 driving gear are fixedly connected as a whole and rotate and transmit power as a whole. The power is input from the input shaft, passes through the No. 1 driving gear and the No. 1 driven gear, the No. 2 driving gear and the No. 2 driven gear, the No. 5 driving gear and the No. 5 driven gear, the No. 6 driving gear and the No. 6 driven gear, the planetary gear, and finally output by the planetary carrier;

[0018] The third gear transmission route is: when the second clutch and the fourth clutch are engaged, and the other clutches are not engaged, the second driving gear and the third driven gear, the fourth driving gear and the fifth driven gear are fixedly connected as a whole and rotate and transmit power as a whole. The power is input from the input shaft, passes through the first driving gear and the first driven gear, the sixth driving gear and the sixth driven gear, the planetary gear, and finally output by the planetary carrier;

[0019] The four-speed transmission route is as follows: when the No. 2 clutch and the No. 5 clutch are engaged, and the other clutches are not engaged, the No. 2 driving gear and the No. 3 driven gear, the No. 4 driven gear and the No. 5 driving gear are fixedly connected as a whole and rotate and transmit power as a whole. The power is input from the input shaft, passes through the No. 1 driving gear and the No. 1 driven gear, the No. 4 driving gear and the No. 4 driven gear, the No. 5 driving gear and the No. 5 driven gear, the No. 6 driving gear and the No. 6 driven gear, the planetary gear, and finally output by the planetary carrier;

[0020] The five-speed transmission route is as follows: when the No. 3 clutch and the No. 4 clutch are engaged, and the other clutches are not engaged, the No. 1 driving gear and the No. 3 driving gear, the No. 4 driving gear and the No. 5 driven gear are fixedly connected as a whole and rotate and transmit power as a whole. The power is input from the input shaft, passes through the No. 3 driving gear and the No. 3 driven gear, the No. 6 driving gear and the No. 6 driven gear, the planetary gear, and finally output by the planetary carrier;

[0021] The six-speed transmission route is as follows: when the No. 3 clutch and the No. 5 clutch are engaged and the other clutches are not engaged, the No. 1 driving gear and the No. 3 driving gear, the No. 4 driven gear and the No. 5 driving gear are fixedly connected as a whole and rotate and transmit power as a whole. The power is input from the input shaft, passes through the No. 3 driving gear and the No. 3 driven gear, the No. 4 driving gear and the No. 4 driven gear, the No. 5 driving gear and the No. 5 driven gear, the No. 6 driving gear and the No. 6 driven gear, the planetary gear, and is finally output by the planetary carrier.

[0022] Further, as a preferred solution: the number of engagements of the fixed-axis gears in each gear is an even number, and the planetary gears are output by the planetary carrier, so the six speed ratios are all positive speed ratios, that is, the output and input are in the same direction; the fourth clutch and the fifth clutch are engaged at the same time, and the other clutches are not engaged, the engine power is cut off, and the fixed-axis output shaft is braked at the same time

[0023] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0024] 1. According to the working conditions of fracturing operations, the number of gears and gear layout are optimized to reduce the control difficulty, smooth gear shifting, and provide a larger speed ratio range.

[0025] 2. Fixed-axis gear transmission is easier to maintain than planetary transmission.

[0026] 3. Adding a planetary gear at the end increases the torque and reduces the bearing torque of the fixed axis gear. Therefore, the size and weight of the fixed axis part are reduced, and the structural layout is optimized.

[0027] 4. Braking output can be achieved inside the gearbox without adding additional brake discs outside the gearbox.

[0028] 5. The gear shifting does not require cutting off the engine power. The fixed-axis transmission gear meshes 2 or 4 times for each transmission ratio, resulting in high mechanical efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and should not be regarded as limiting the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative work, among which:

[0030] Figure 1 It is a schematic diagram of the structure of the present invention;

[0031] Figure 2 It is a topological diagram of the spatial layout of each axis system of the present invention;

[0032] Markings in the figure: 1-input shaft system, 2-first intermediate shaft system, 3-second intermediate shaft system, 4-fixed shaft output shaft system, 5-planetary gear, 101-input shaft, 102-No. 1 driving gear, 103-No. 3 driving gear, 201-first intermediate shaft, 202-No. 1 driven gear, 203-No. 2 driving gear, 204-No. 3 driven gear, 205-No. 4 driving gear, 206-No. 5 driven gear, 207-No. 6 driving gear Wheel, 301-second intermediate shaft, 302-driven gear No. 2, 303-driven gear No. 4, 304-driving gear No. 5, 401-fixed output shaft, 402-driven gear No. 6, 501-sun gear, 502-planet carrier, 503-planetary gear, 504-inner ring gear, C1-clutch No. 1, C2-clutch No. 2, C3-clutch No. 3, C4-clutch No. 4, C5-clutch No. 5, 0-case frame. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical scheme and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention, that is, the embodiments described are only part of the embodiments of the present invention, rather than all of the embodiments. The components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0034] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present invention.

[0035] It should be noted that relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0036] Embodiment 1

[0037] A preferred embodiment of the present invention provides a parallel fixed-axis power shift transmission, referring to Figure 1 The engine power is inputted by the input shaft 101 , and when all the clutches are in a disengaged state, the engine power can be transmitted to the first driving gear 102 , the first driven gear 202 , the second driving gear 203 and the second driven gear 302 .

[0038] The coupling of the friction plate and the steel plate of the clutch relies on the hydraulic drive of the hydraulic system. After the ECU control unit gives the engagement signal, the oil chamber in the clutch hub is filled with oil, and the coupling of the friction plate and the steel plate is pushed under the action of the oil pressure, thereby engaging the two elements; when the hydraulic oil in the clutch hub is depressurized, the return spring drives the friction plate and the steel plate to separate. This clutch engagement method can achieve gear shifting without cutting off the power.

[0039] The six speed ratios of the present invention are achieved in the following manner:

[0040] When the No. 1 clutch C1 and the No. 4 clutch C4 are engaged, and the other clutches are not engaged, the No. 2 driven gear 302 and the No. 4 driven gear 303, the No. 4 driving gear 205 and the No. 5 driven gear 206 are fixedly connected as a whole and rotate and transmit power as a whole. The power is input from the input shaft 101, passes through the No. 1 driving gear 102 and the No. 1 driven gear 202, the No. 2 driving gear 203 and the No. 2 driven gear 302, the No. 4 driven gear 303 and the No. 4 driving gear 205, the No. 6 driving gear 207 and the No. 6 driven gear 402, the planetary gear 5, and finally output by the planetary carrier 502. This is the first gear.

[0041] When the No. 1 clutch C1 and the No. 5 clutch C5 are engaged, and the other clutches are not engaged, the No. 2 driven gear 302 and the No. 4 driven gear 303, the No. 4 driven gear 303 and the No. 5 driving gear 304 are fixedly connected as a whole and rotate and transmit power as a whole. The power is input from the input shaft 101, passes through the No. 1 driving gear 102 and the No. 1 driven gear 202, the No. 2 driving gear 203 and the No. 2 driven gear 302, the No. 5 driving gear 304 and the No. 5 driven gear 206, the No. 6 driving gear 207 and the No. 6 driven gear 402, the planetary gear 5, and finally output by the planetary carrier 502. This is the second gear.

[0042] When the No. 2 clutch C2 and the No. 4 clutch C4 are engaged, and the other clutches are not engaged, the No. 2 driving gear 203 and the No. 3 driven gear 204, the No. 4 driving gear 205 and the No. 5 driven gear 206 are fixedly connected as a whole and rotate and transmit power as a whole. The power is input from the input shaft 101, passes through the No. 1 driving gear 102 and the No. 1 driven gear 202, the No. 6 driving gear 207 and the No. 6 driven gear 402, the planetary gear 5, and finally output by the planetary carrier 502. This is the third gear.

[0043] When the No. 2 clutch C2 and the No. 5 clutch C5 are engaged, and the other clutches are not engaged, the No. 2 driving gear 203 and the No. 3 driven gear 204, the No. 4 driven gear 303 and the No. 5 driving gear 304 are fixedly connected as a whole and rotate and transmit power as a whole. The power is input from the input shaft 101, passes through the No. 1 driving gear 102 and the No. 1 driven gear 202, the No. 4 driving gear 205 and the No. 4 driven gear 303, the No. 5 driving gear 304 and the No. 5 driven gear 206, the No. 6 driving gear 207 and the No. 6 driven gear 402, the planetary gear 5, and finally output by the planetary carrier 502. This is the fourth gear.

[0044] When the No. 3 clutch C3 and the No. 4 clutch C4 are engaged, and the other clutches are not engaged, the No. 1 driving gear 102 and the No. 3 driving gear 103, the No. 4 driving gear 205 and the No. 5 driven gear 206 are fixedly connected as a whole and rotate and transmit power as a whole. The power is input from the input shaft 101, passes through the No. 3 driving gear 103 and the No. 3 driven gear 204, the No. 6 driving gear 207 and the No. 6 driven gear 402, the planetary gear 5, and is finally output by the planetary carrier 502. This is the fifth gear.

[0045] When the No. 3 clutch C3 and the No. 5 clutch C5 are engaged, and the other clutches are not engaged, the No. 1 driving gear 102 and the No. 3 driving gear 103, the No. 4 driven gear 303 and the No. 5 driving gear 304 are fixedly connected as a whole and rotate and transmit power as a whole. The power is input from the input shaft 101, passes through the No. 3 driving gear 103 and the No. 3 driven gear 204, the No. 4 driving gear 205 and the No. 4 driven gear 303, the No. 5 driving gear 304 and the No. 5 driven gear 206, the No. 6 driving gear 207 and the No. 6 driven gear 402, the planetary gear 5, and finally output by the planetary carrier 502. This is the sixth gear.

[0046] Table 1 is an embodiment of six speed ratios

[0047] Gear position C1 C2 C3 C4 C5

[0048] Table 1

[0049] Gear C1 C2 C3 C4 C5 F1 √ √ F2 √ √ F3 √ √ F4 √ √ F5 √ √ F6 √ √

[0050] See attached Figure 2 , the layout topology of the input shaft 101, the fixed-axis output shaft 401, the first intermediate shaft 201 and the second intermediate shaft 301, a1 is the axial distance between the input shaft 101 and the first intermediate shaft 201, a2 is the axial distance between the first intermediate shaft 201 and the second intermediate shaft 301, under the premise that the shaft system parts do not interfere with each other, the first intermediate shaft 201 rotates around the input shaft 101, and the second intermediate shaft 301 rotates around the first intermediate shaft 201 to change the angles α and β, and a reasonable spatial layout can be obtained by rotation according to the space constraints.

[0051] The above description is only a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions and improvements made by any technician familiar with the field within the spirit and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A parallel fixed-axis power shift transmission, characterized in that: It comprises an input shaft system (1), a first intermediate shaft system (2), a second intermediate shaft system (3), a fixed shaft output shaft system (4), and a planetary gear (5); The input shaft system (1) is composed of an input shaft (101), a first driving gear (102), a third driving gear (103) and a third clutch (C3); the first driving gear (102) is fixedly connected to the input shaft (101), and the third driving gear (103) is an idler gear; the first driving gear (102) and the third driving gear (103) are connected as a whole through the third clutch (C3); The first intermediate shaft system (2) is composed of a first intermediate shaft (201), a first driven gear (202), a second driving gear (203), a third driven gear (204), a fourth driving gear (205), a fifth driven gear (206), a sixth driving gear (207), a second clutch (C2) and a fourth clutch (C4); the first driven gear (202) and the second driving gear (203) are double gears with empty sleeves; the second driving gear (203) and the third driven gear (204) are connected as a whole through the second clutch (C2); the fourth driving gear (205) and the fifth driven gear (206) are connected through the fourth clutch (C4); The second intermediate shaft system (3) is composed of a second intermediate shaft (301), a second driven gear (302), a fourth driven gear (303), a fifth driving gear (304), a first clutch (C1) and a fifth clutch (C5); the second driven gear (302) and the fifth driving gear (304) are both idler gears; the second driven gear (302) and the fourth driven gear (303) are connected as a whole through the first clutch (C1); the fourth driven gear (303) and the fifth driving gear (304) are connected as a whole through the fifth clutch (C5); The fixed-axis output shaft system (4) is composed of a fixed-axis output shaft (401) and a sixth driven gear (402), and the fixed-axis output shaft (401) is fixedly connected to the sixth driven gear (402); The planetary gear (5) is composed of a sun gear (501), a planet carrier (502), a planetary gear (503) and an inner gear ring (504); the sun gear (501) is connected to the fixed axis output shaft (401), and the inner gear ring (504) is fixed on the box frame (0); The first driving gear (102) meshes with the first driven gear (202), the second driving gear (203) meshes with the second driven gear (302), the third driving gear (103) meshes with the third driven gear (204), the fourth driving gear (205) meshes with the fourth driven gear (303), the fifth driving gear (304) meshes with the fifth driven gear (206), and the sixth driving gear (207) meshes with the sixth driven gear (402).

2. The parallel fixed-axis power shift transmission according to claim 1, characterized in that: The rotation center lines of the input shaft (101), the fixed-axis output shaft (401) and the planet carrier (502) are installed on the same straight line, so that the input and output are coaxial.

3. The parallel fixed-axis power shift transmission according to claim 1, characterized in that: It also includes an ECU control unit, wherein the hydraulic power controlled by the ECU control unit drives the clutch friction plate and the steel plate to couple, and any two of the first clutch (C1), the second clutch (C2), the third clutch (C3), the fourth clutch (C4) and the fifth clutch (C5) are combined to obtain a six-speed ratio; The first gear transmission route is as follows: when the first clutch (C1) and the fourth clutch (C4) are engaged, and the other clutches are not engaged, the second driven gear (302) and the fourth driven gear (303), the fourth driving gear (205) and the fifth driven gear (206) are fixedly connected as a whole and rotate and transmit power as a whole. The power is input from the input shaft (101), passes through the first driving gear (102) and the first driven gear (202), the second driving gear (203) and the second driven gear (302), the fourth driven gear (303) and the fourth driving gear (205), the sixth driving gear (207) and the sixth driven gear (402), the planetary gear (5), and finally output by the planetary carrier (502); The second gear transmission route is as follows: when the first clutch (C1) and the fifth clutch (C5) are engaged and the other clutches are not engaged, the second driven gear (302) and the fourth driven gear (303), the fourth driven gear (303) and the fifth driving gear (304) are fixedly connected as a whole and rotate and transmit power as a whole. The power is input from the input shaft (101), passes through the first driving gear (102) and the first driven gear (202), the second driving gear (203) and the second driven gear (302), the fifth driving gear (304) and the fifth driven gear (206), the sixth driving gear (207) and the sixth driven gear (402), the planetary gear (5), and finally output by the planetary carrier (502); The third gear transmission route is as follows: when the second clutch (C2) and the fourth clutch (C4) are engaged, and the other clutches are not engaged, the second driving gear (203) and the third driven gear (204), the fourth driving gear (205) and the fifth driven gear (206) are fixedly connected as a whole and rotate and transmit power as a whole. The power is input from the input shaft (101), passes through the first driving gear (102) and the first driven gear (202), the sixth driving gear (207) and the sixth driven gear (402), the planetary gear (5), and finally output by the planetary carrier (502); The four-speed transmission route is as follows: when the second clutch (C2) and the fifth clutch (C5) are engaged and the other clutches are not engaged, the second driving gear (203) and the third driven gear (204), the fourth driven gear (303) and the fifth driving gear (304) are fixedly connected as a whole and rotate and transmit power as a whole. The power is input from the input shaft (101), passes through the first driving gear (102) and the first driven gear (202), the fourth driving gear (205) and the fourth driven gear (303), the fifth driving gear (304) and the fifth driven gear (206), the sixth driving gear (207) and the sixth driven gear (402), the planetary gear (5), and finally output by the planetary carrier (502); The five-speed transmission route is as follows: when the third clutch (C3) and the fourth clutch (C4) are engaged, and the other clutches are not engaged, the first driving gear (102) and the third driving gear (103), the fourth driving gear (205) and the fifth driven gear (206) are fixedly connected as a whole and rotate and transmit power as a whole. The power is input from the input shaft (101), passes through the third driving gear (103) and the third driven gear (204), the sixth driving gear (207) and the sixth driven gear (402), the planetary gear (5), and is finally output by the planetary carrier (502); The six-speed transmission route is as follows: when the third clutch (C3) and the fifth clutch (C5) are engaged and the other clutches are not engaged, the first driving gear (102) and the third driving gear (103), the fourth driven gear (303) and the fifth driving gear (304) are fixedly connected as a whole and rotate and transmit power as a whole. The power is input from the input shaft (101), passes through the third driving gear (103) and the third driven gear (204), the fourth driving gear (205) and the fourth driven gear (303), the fifth driving gear (304) and the fifth driven gear (206), the sixth driving gear (207) and the sixth driven gear (402), the planetary gear (5), and is finally output by the planetary carrier (502).

4. The parallel fixed-axis power shift transmission according to claim 3, characterized in that: The number of engagements of the fixed axis gears in each gear position is an even number, and the planetary row (5) is the output of the planetary carrier (502).

Images