A power shift transmission for tractors

Abstract

The invention discloses a tractor power shift transmission, which relates to the technical field of transmissions. The tractor power shift transmission comprises a main speed shift mechanism, wherein the output end of the main speed shift mechanism is connected to an auxiliary speed shift mechanism, wherein a plurality of clutches are arranged on the main speed shift mechanism and shifting is performed by reciprocating movement of the clutches along an axis, wherein the main speed shift mechanism comprises a first input shaft and a first output shaft coaxially arranged with the first input shaft, wherein power is transmitted between the first input shaft and the first output shaft through a plurality of gear sets and a plurality of clutches, wherein the scheme provided by the invention can preselect a gear according to operation requirements, and adjust an engine to an optimal speed and power region according to real-time load changes, wherein all gear switching is fully realized by automatic control, thereby improving operation efficiency and reducing labor intensity.

Description

Technical Field

[0001] The invention relates to the technical field of transmissions, and in particular to a power shift transmission for tractors. Background Art

[0002] At present, tractor transmissions are basically all used in developed countries such as Europe and the United States. Power shift transmissions and CVT transmissions, while in China, due to technical and industrial foundation reasons, manual transmissions are currently the main ones, which makes tractors equipped with manual transmissions have low operating efficiency, high labor intensity, and cannot adapt to the development needs of agricultural automation and intelligence. In view of the above situation, in recent years, the domestic tractor industry has vigorously promoted the development of automatic transmission technology. Among them, the patent number CN201821468657.0 is a tractor transmission assembly combined with a three-axis power shift transmission box. It proposes a power shift transmission that realizes 2 forward and 1 reverse gears through three shafts, three clutches, and six gears, and is matched with a mechanical multi-speed main and auxiliary box to realize partial power shifting. However, due to too few power shift gears, compared with the advanced 4 forward and 4 reverse power shift transmissions abroad, it cannot adapt to complex working conditions, and the existing foreign technology is extremely complex and cannot meet the cost-effective requirements of domestic tractors.

[0003] Existing patents provide some solutions, such as patent US20230074560A1, which includes an inner clutch assembly. A conical member is rotatably coupled to a first shaft, an inner conical member, an inner conical member defining a first curved surface of a conical member, and an outer conical member. The conical member is rotatably coupled to a second fragment, that is, an outer conical member opposite to a second friction surface-a first surface. The inner conical member and the outer conical member are configured to selectively engage and separate from each other. When the inner cone outer conical member engages with the outer conical member, the first conical member and the outer cone inner cone member friction surface engage with the second friction surface of the outer cone mold, so that the rotational motion is transmitted in the middle. The inner conical member and the outer conical member, the inner conical member, the inner conical member, the outer conical member, the inner surface of the inner conical member opposite to the first friction surface include at least one groove configured to receive cooling during the operation of the conical assembly, and here, the inventor believes that there is still a lot of room for improvement. Summary of the invention

[0004] The present invention provides a tractor power shift transmission which can preselect gears according to operation requirements, adjust the engine to an optimal speed and power range according to real-time load changes, realize all gear switching through automatic control, improve operation efficiency, eliminate the need for manual operation, and lubricate the power shaft during operation to increase the practical life.

[0005] The technical solution provided by the present invention to achieve the above-mentioned purpose is: a tractor power shift transmission, including a main speed shift mechanism, the output end of the main speed shift mechanism is connected to the auxiliary speed shift mechanism, the main speed shift mechanism is provided with a plurality of clutches and shifting is performed by reciprocating movement of the clutches along the axis, the main speed shift mechanism includes a first input shaft and a first output shaft coaxially arranged with the first input shaft, and power is transmitted between the first input shaft and the first output shaft through a plurality of gear sets and a plurality of clutches.

[0006] In the present invention, a first intermediate shaft is disposed on one side of the first input shaft, and a first gear set, a second gear set, a third gear set and a fourth gear set are sequentially mounted on the first input shaft and the first intermediate shaft in order from left to right.

[0007] Furthermore, the first gear group includes gear Z1 and gear Z2, the second gear group includes gear Z3 and gear Z4, the third gear group includes gear Z5 and gear Z6, and the fourth gear group includes gear Z7 and gear Z8, wherein gear Z1 is fixed on the first input shaft, and gear Z1, as a driving gear, meshes with the driven gear Z2 on one side, so that the first intermediate shaft rotates around the first input shaft during operation, and since gear Z4 and gear Z6 are loosely mounted on the first intermediate shaft, the clutch needs to be engaged during the rotation process to play a transmission role. In addition, gear Z8 is fixedly connected to the first intermediate shaft, gear Z8 meshes with gear Z7, gear Z7 is loosely mounted on the first output shaft, and a fourth wet clutch is connected to the side of gear Z7, and the other end of the fourth wet clutch is connected to the first output shaft. When the fourth wet clutch is engaged, the transmission force received by gear Z7 is further transmitted to the first output shaft, thereby outputting power.

[0008] In the present invention, the clutch includes a first wet clutch arranged between the first input shaft and the first output shaft, a second wet clutch is arranged on the first intermediate shaft and the second gear set, a third wet clutch is arranged between the first intermediate shaft and the third gear set, and a fourth wet clutch is arranged between the fourth gear set and the first output shaft.

[0009] Furthermore, when the first wet clutch is engaged, the first input shaft directly transmits power to the first output shaft, which is the first gear position; when the second wet clutch is engaged, the first input shaft inputs power, gear Z1 meshes with gear Z2, gear Z2 transmits power to the first intermediate shaft, and the first intermediate shaft further transmits power to gear Z4 through the engaged second wet clutch. Since gear Z4 meshes with gear Z3, gear Z3 is fixedly connected to the first output shaft, and gear Z3 rotates to drive the first output shaft to output power, which is the second gear position; when the third wet clutch is engaged, the first input shaft inputs power, Gear Z1 is engaged with gear Z2, gear Z2 transmits power to the first intermediate shaft, the first intermediate shaft further transmits power to gear Z6 through the engaged third wet clutch, gear Z6 is engaged with gear Z5, gear Z5 is fixedly connected to the first output shaft, so the rotation of gear Z6 drives gear Z5 to rotate and then the first output shaft outputs power, which is the third gear position; when the fourth wet clutch is engaged, gear Z1 drives gear Z2 to rotate, gear Z7 is fixedly connected to the first intermediate shaft, and the transmission force received by gear Z7 is further transmitted to the first output shaft, thereby outputting power, which is the fourth gear position.

[0010] In the present invention, the second wet clutch and the third wet clutch share an input end, that is, the input axial force of the second wet clutch and the third wet clutch is the first intermediate shaft, and the length of the connection part should be consistent.

[0011] It is worth mentioning here that a power take-off shaft is sleeved at the center of the first output shaft, the power take-off shaft is hollowly sleeved inside the first output shaft, and one end of the power take-off shaft is connected to a clutch, the input end of the clutch is the first input shaft, and further, the clutch and the power take-off shaft are combined to form a PTO power take-off system.

[0012] In the present invention, one end of the first output shaft is connected to the second input shaft, one end of the second input shaft is provided with a coaxial second intermediate shaft, one side of the second input shaft is provided with an idler shaft, and the side of the second input shaft away from the idler shaft is provided with a second output shaft.

[0013] Furthermore, the first output shaft and the second input shaft are the same shaft body, and are described here as two shaft bodies for easy identification.

[0014] In the present invention, in order from left to right, the fifth gear set and the sixth gear set are installed on the second input shaft and the second output shaft, the seventh gear set is installed on the second input shaft and the idler shaft, the eighth gear set is installed on the second output shaft and the idler shaft, the ninth gear set is installed on the second intermediate shaft and the second output shaft, the seventh gear set and the eighth gear set are arranged on the same horizontal plane, and the two gear sets share a planetary gear, and the tenth gear set is installed on the idler shaft and the second intermediate shaft.

[0015] Further, the fifth gear set includes gear Z9 and gear Z10, the sixth gear set includes gear Z11 and gear Z12, the seventh gear set includes gear Z13 and gear Z14, the eighth gear set includes gear Z13 and gear Z15, the ninth gear set includes gear Z16 and gear Z17, and the tenth gear set includes gear Z18 and gear Z19, wherein the second intermediate shaft is also sleeved on the power take-off shaft and is coaxial with the first input shaft, the first output shaft, and the second input shaft.

[0016] In the present invention, the auxiliary speed change shifting mechanism includes at least one first synchronizer, which can be used to fixedly connect the fifth gear set and the sixth gear set arranged on the second output shaft with the second output shaft.

[0017] Furthermore, due to the inconsistent transmission ratios between different gears, only one of the synchronizers can be mobilized at a time, and the first synchronizer can be displaced axially along the second output shaft. When the first synchronizer is displaced to the left and fixedly connected to gear Z10, the power is transmitted to gear Z9, gear Z10, the first synchronizer, and output through the second output shaft in sequence through the second input shaft to achieve one gear; when the first synchronizer is fixedly connected to gear Z12 on the right side, the power is transmitted to gear Z11, gear Z12, the first synchronizer, and output through the second output shaft in sequence through the second input shaft to achieve the second gear.

[0018] In the present invention, the auxiliary speed change shifting mechanism includes at least one second synchronizer, which can be used to fixedly connect the seventh gear set and the eighth gear set arranged on the second output shaft with the second output shaft.

[0019] Further, when the second synchronizer is on the right side, the power is transmitted to the gear Z14, gear Z13, idler shaft, gear Z18, gear Z19, second intermediate shaft, gear Z16, gear Z17, and the second synchronizer is output through the second output shaft in sequence to achieve the third gear; when the second synchronizer is on the left side, the power is transmitted to the gear Z14, gear Z13, gear Z15, and the second synchronizer is output through the second output shaft in sequence to achieve a reverse gear.

[0020] According to the above description, the main transmission shift mechanism has 4 gears, the auxiliary transmission shift mechanism has 3 gears and 1 reverse gear. The power of the entire transmission system is input through the first input shaft of the main transmission shift mechanism, and after the speed change of the main transmission shift mechanism, the speed change or direction switching of the auxiliary transmission shift mechanism, the power is finally output to the front and rear axles of the tractor through the second output shaft to drive the vehicle. Therefore, through the gear combination of the main and auxiliary transmissions, 12 forward gears and 4 reverse gears can be achieved. And in the operation, the auxiliary transmission system gear is pre-selected, and the main transmission mechanism power shift is used during operation to adjust the engine speed so that the engine can work in the optimal speed and power area to meet the needs of real-time load changes.

[0021] Compared with the prior art, the tractor power shift transmission provided by the present invention includes a main speed shift mechanism, the output end of the main speed shift mechanism is connected to an auxiliary speed shift mechanism, a plurality of clutches are arranged on the main speed shift mechanism and shifting is performed by reciprocating movement of the clutches along an axis, and the auxiliary speed shift system gear can be pre-selected during operation, and the engine speed is adjusted through power shifting of the main speed shift mechanism during operation, so that the engine can operate in an optimal speed and power range to adapt to the real-time load change requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0023] Figure 1 A schematic diagram of the transmission structure of a tractor power shift transmission according to the present invention;

[0024] Figure 2 It is a transmission structure schematic diagram of another main speed change shift mechanism involved in the present invention;

[0025] Figure 3 It is a transmission structure schematic diagram of the first auxiliary speed change shifting mechanism involved in the present invention;

[0026] Figure 4 It is a transmission structure schematic diagram of the second auxiliary speed change shifting mechanism involved in the present invention;

[0027] Figure 5 The present invention adopts Figure 2 and Figure 3 A schematic diagram of the transmission structure of the shifting mechanism formed by the combination;

[0028] Figure 6 The present invention adopts Figure 2 and Figure 4 A schematic diagram of the transmission structure of the shifting mechanism formed by the combination;

[0029] Figure 7 It is a schematic diagram of the connection structure between the input shaft and the lubrication assembly involved in the present invention;

[0030] Figure 8 It is a schematic diagram of the internal structure of the lubrication component involved in the present invention;

[0031] Fig. 9 It is a schematic diagram of the internal structure of the injection head involved in the present invention.

[0032] Description of Reference Numerals

[0033] 1-main speed shift mechanism; 11-first input shaft; 12-first intermediate shaft; 13-first output shaft; 2-second speed shift mechanism; 21-second input shaft; 22-second intermediate shaft; 23-idle shaft; 24-second output shaft; 31-first wet clutch; 32-second wet clutch; 33-third wet clutch; 34-fourth wet clutch; 51-first synchronizer; 52-second synchronizer; 6-lubrication assembly; 61-frame; 62-through hole; 65-oil injection assembly; 651-shell; 652-oil chamber; 653-spring; 654-rubber column; 655-guide sleeve; 656-oil channel; 66-injection head; 661-positioning sleeve; 662-sliding block; 663-ball. DETAILED DESCRIPTION

[0034] Embodiment 1:

[0035] Reference Figure 1 As shown, a tractor power shift transmission comprises a main speed shift mechanism 1, wherein the output end of the main speed shift mechanism 1 is connected to an auxiliary speed shift mechanism 2, wherein a plurality of clutches 3 are arranged on the main speed shift mechanism 1 and shifting is performed by reciprocating movement of the clutches 3 along an axis, wherein the main speed shift mechanism 1 comprises a first input shaft 11 and a first output shaft 13 coaxially arranged with the first input shaft 11, and power is transmitted between the first input shaft 11 and the first output shaft 13 through a plurality of gear sets and a plurality of clutches 3.

[0036] In the present invention, a first intermediate shaft 12 is disposed on one side of the first input shaft 11, and a first gear set, a second gear set, a third gear set and a fourth gear set are sequentially installed on the first input shaft 11 and the first intermediate shaft 12 from left to right.

[0037] Further, the first gear set includes gears Z1 and Z2, the second gear set includes gears Z3 and Z4, the third gear set includes gears Z5 and Z6, and the fourth gear set includes gears Z7 and Z8, wherein gear Z1 is fixed on the first input shaft 11, and gear Z1 is meshed with the driven gear Z2 on one side as a driving gear, so that the first intermediate shaft 12 rotates around the first input shaft 11 during operation, and since gears Z4 and Z6 are loosely mounted on the first intermediate shaft 12, the clutch needs to be engaged during the rotation process to play a transmission role. In addition, gear Z8 is fixedly connected to the first intermediate shaft 12, gear Z8 is meshed with gear Z7, gear Z7 is loosely mounted on the first output shaft 13, and a fourth wet clutch 34 is connected to the side of gear Z7, and the other end of the fourth wet clutch 34 is connected to the first output shaft 13. When the fourth wet clutch 34 is engaged, the transmission force received by gear Z7 is further transmitted to the first output shaft 13, thereby outputting power.

[0038] In the present invention, the clutch 3 includes a first wet clutch 31 arranged between the first input shaft 11 and the first output shaft 13, a second wet clutch 32 is arranged on the first intermediate shaft 12 and the second gear set, a third wet clutch 33 is arranged between the first intermediate shaft 12 and the third gear set, and a fourth wet clutch 34 is arranged between the fourth gear set and the first output shaft 13.

[0039] Further, when the first wet clutch 31 is engaged, the first input shaft 11 directly transmits power to the first output shaft 13, which is the first gear position; when the second wet clutch 32 is engaged, the first input shaft 11 inputs power, the gear Z1 is meshed with the gear Z2, the gear Z2 transmits power to the first intermediate shaft 12, and the first intermediate shaft 12 further transmits power to the gear Z4 through the engaged second wet clutch 32. Since the gear Z4 is meshed with the gear Z3, the gear Z3 is fixedly connected to the first output shaft 13, and the gear Z3 rotates to drive the first output shaft 13 to output power, which is the second gear position; when the third wet clutch 33 is engaged, the first input shaft 11 inputs power, the gear Z1 is meshed with the gear Z2, and the gear Z2 transmits power to the first intermediate shaft 12, and the first intermediate shaft 12 further transmits power to the gear Z4 through the engaged second wet clutch 32. Since the gear Z4 is meshed with the gear Z3, the gear Z3 is fixedly connected to the first output shaft 13, and the gear Z3 rotates to drive the first output shaft 13 to output power, which is the second gear position; When power is input, gear Z1 meshes with gear Z2, gear Z2 transmits power to the first intermediate shaft 12, and the first intermediate shaft 12 further transmits power to gear Z6 through the engaged third wet clutch 33, gear Z6 meshes with gear Z5, and gear Z5 is fixedly connected to the first output shaft 13, so the rotation of gear Z6 drives gear Z5 to rotate, thereby causing the first output shaft 13 to output power, which is the third gear position; when the fourth wet clutch 34 is engaged, gear Z1 drives gear Z2 to rotate, and gear Z7 is fixedly connected to the first intermediate shaft 12, and the transmission force received by gear Z7 is further transmitted to the first output shaft 13, thereby outputting power, which is the fourth gear position.

[0040] In the present invention, the second wet clutch 32 and the third wet clutch 33 share an input end. That is, the input axial forces of the second wet clutch 32 and the third wet clutch 33 are both the first intermediate shaft, and the length of the connection portion should be consistent.

[0041] It is worth mentioning here that a power take-off shaft S6 is sleeved at the center of the first output shaft 13, and the power take-off shaft S6 is loosely sleeved inside the first output shaft 13, and one end of the power take-off shaft is connected to a clutch, and the input end of the clutch is the first input shaft 11. Furthermore, the clutch and the power take-off shaft are combined to form a PTO power take-off system.

[0042] In the present invention, one end of the first output shaft 13 is connected to the second input shaft 21, one end of the second input shaft 21 is provided with a coaxial second intermediate shaft 22, one side of the second input shaft 21 is provided with an idler shaft 23, and the side of the second input shaft 21 away from the idler shaft 23 is provided with a second output shaft 24.

[0043] Furthermore, the first output shaft 13 and the second input shaft 21 are the same shaft body, and are described here as two shaft bodies for easy identification.

[0044] In the present invention, in order from left to right, the fifth gear set and the sixth gear set are installed on the second input shaft 21 and the second output shaft 24, the seventh gear set is installed on the second input shaft 21 and the idler shaft 23, the eighth gear set is installed on the second output shaft 24 and the idler shaft 23, the ninth gear set is installed on the second intermediate shaft 22 and the second output shaft 24, the seventh gear set and the eighth gear set are arranged on the same horizontal plane, and the two gear sets share a planetary gear, and the tenth gear set is installed on the idler shaft 23 and the second intermediate shaft 22.

[0045] Furthermore, the fifth gear set includes gear Z9 and gear Z10, the sixth gear set includes gear Z11 and gear Z12, the seventh gear set includes gear Z13 and gear Z14, the eighth gear set includes gear Z13 and gear Z15, the ninth gear set includes gear Z16 and gear Z17, and the tenth gear set includes gear Z18 and gear Z19, wherein the second intermediate shaft 22 is also sleeved on the power take-off shaft and is coaxial with the first input shaft 11, the first output shaft 13, and the second input shaft 21.

[0046] In the present invention, the auxiliary speed change shift mechanism 2 includes at least one first synchronizer 51 , which can be used to fixedly connect the fifth gear set and the sixth gear set arranged on the second output shaft 24 to the second output shaft 24 .

[0047] Furthermore, since the transmission ratios of different gears are inconsistent, only one of the synchronizers can be mobilized at a time. The first synchronizer 51 can be displaced axially along the second output shaft 24. When the first synchronizer 51 is displaced to the left and fixedly connected to the gear Z10, the power is transmitted to the gear Z9, the gear Z10, the first synchronizer 51, and the output through the second output shaft 24 in sequence through the second input shaft 21 to achieve one gear; when the first synchronizer 51 is fixedly connected to the gear Z12 on the right side, the power is transmitted to the gear Z11, the gear Z12, the first synchronizer 51, and the output through the second output shaft 24 in sequence through the second input shaft 21 to achieve the second gear.

[0048] In the present invention, the auxiliary speed change shift mechanism 2 includes at least one second synchronizer 52 , which can be used to fixedly connect the seventh gear set and the eighth gear set arranged on the second output shaft 24 to the second output shaft 24 .

[0049] Further, when the second synchronizer 52 is on the right side, the power is transmitted to the gear Z14, gear Z13, idler shaft 23, gear Z18, gear Z19, second intermediate shaft 22, gear Z16, gear Z17, and the second synchronizer 52 is output through the second output shaft 24 in sequence through the second input shaft 21 to achieve the third gear; when the second synchronizer 52 is on the left side, the power is transmitted to the gear Z14, gear Z13, gear Z15, and the second synchronizer 52 is output through the second output shaft 24 in sequence through the second input shaft 21 to achieve a reverse gear.

[0050] According to the above description, the main speed shift mechanism 1 has 4 gears, the auxiliary speed shift mechanism 2 has 3 gears and 1 reverse gear. The power of the entire transmission system is input through the first input shaft 11 of the main speed shift mechanism 1, and after the speed change of the main speed shift mechanism 1, and then the speed change or direction switching of the auxiliary speed shift mechanism 2, the power is finally output to the front and rear axles of the tractor through the second output shaft 24 to drive the vehicle to travel. Therefore, through the gear combination of the main and auxiliary transmissions, 12 forward gears and 4 reverse gears can be achieved. And in the operation, the gear of the auxiliary speed shift mechanism 2 is pre-selected, and the power of the main speed shift mechanism is shifted during operation to adjust the engine speed so that the engine can work in the optimal speed and power area to meet the needs of real-time load changes.

[0051] Embodiment 2:

[0052] Reference Figure 2As shown, compared with the embodiment 1, the difference of this embodiment is that this embodiment shows another main speed change gear shifting mechanism 1, and the speed change system includes 7 gear sets, 4 shaft systems, 4 wet clutches and a chain transmission scheme. Specifically, the first output shaft 13 is sleeved on the outer side of the first input shaft 11, and the first intermediate shaft 12 and the third intermediate shaft 14 are arranged on the side of the first input shaft 11 with a fixed distance from the first input shaft 11, and the first input shaft 11 is sleeved with a gear Z2, and a clutch K1 is arranged on one side of the gear Z2, and the other end of the clutch K1 is connected to the gear Z3, and the gear Z3 is fixedly connected to the first input shaft 11, and the other end of the gear Z3 is connected to the clutch K2, and one end of the clutch K2 is fixedly connected to the gear Z6, and the gear Z6 is fixed to the first output shaft 13 The gear Z2 is meshed with the gear Z1 and the gear Z1 is fixedly connected to the second intermediate shaft 22, and a sprocket CW1 and a gear Z5 are respectively arranged on the left and right sides of the gear Z1, the sprocket CW1 and the gear Z5 are both fixedly connected to the second intermediate shaft 22, the gear Z5 is meshed with the gear Z6, the sprocket CW1 is connected to the sprocket CW2 through the chain CH1, the sprocket CW2 is loosely sleeved on the first intermediate shaft 12, and a gear Z4 is arranged in the middle of the first intermediate shaft 12, the gear Z4 is meshed with the gear Z3, and a clutch K3 and a clutch K6 are arranged on the left and right sides of the gear Z4. The clutch K4 is connected to the sprocket CW2, and one end of the clutch K4 is connected to the gear Z7, which is meshed with the gear Z6, and the gear Z7 is loosely sleeved on the first intermediate shaft 12. When the clutch K2 is engaged, the power is directly transmitted to the first output shaft 13 through the first input shaft 11 to achieve a gear position; when the clutch K1 is engaged, the power is transmitted to the gear Z3, the clutch K1, the gear Z2, the gear Z1, the second intermediate shaft 22, the gear Z5, the gear Z6, and the first output shaft 13 in sequence through the first input shaft 11. Output to achieve the second gear; when the clutch K3 is engaged, the power is transmitted to the gear Z3, gear Z4, clutch K3, sprocket CW2, chain CH1, sprocket CW1, second intermediate shaft 22, gear Z5, gear Z6 in sequence through the first input shaft 11, and output through the first output shaft 13 to achieve the third gear; when the fourth clutch K4 is engaged, the power is transmitted to the gear Z3, gear Z4, clutch K4, gear Z7, gear Z6 in sequence through the first input shaft 11, and output through the first output shaft 13 to achieve the fourth gear. The wet clutch in the main speed shifting mechanism 1 of this scheme also realizes the engagement and disengagement of the clutch through the electronically controlled hydraulic system, and also realizes uninterrupted torque during the gear shifting process. However, due to its different structural method, the axial dimension is more compact and the radial dimension is relatively larger, so compared with Figure 1 This solution is more suitable for applications with strict restrictions on axial dimensions.

[0053] Embodiment 3:

[0054] Reference Figure 3 As shown, the difference between this embodiment and embodiment 1 is that this embodiment shows another auxiliary speed change shifting mechanism 2, and the auxiliary speed change system includes 12 gear sets, 5 shaft systems, and 3 synchronizers. The first input shaft auxiliary speed shift mechanism 2 input shaft S3 is the main speed shift mechanism 1 output shaft, the intermediate shaft S5, shaft S4, shaft S6 are parallel to the input shaft S3 and fixed center distance arrangement, the output shaft S8 is coaxial with the intermediate shaft S4 and arranged front and rear; gears Z9, Z11, Z14, Z17 are loosely sleeved on the input shaft S3, gears Z10, Z12, Z15, Z18 are fixed on the intermediate shaft S4, gears Z16, Z20 are fixed on shaft S6, gear Z13 is fixed on the intermediate shaft S5, gear Z19 is loosely sleeved on the output shaft S8, wherein gears Z9 and Z10 are meshed with each other, gears Z11 and Z12 are meshed with each other, gears Z15 and Z13 are meshed with each other, gears Z14 and Z13 are meshed with each other, gears Z18 and Z17 are meshed with each other, gear Z16 and Z15 mesh with each other, and gears Z19 and Z20 mesh with each other; 3 sets of synchronizers, synchronizer SY1 is installed between gears Z9 and Z11 and installed on the input shaft S3, synchronizer SY1 on the left side fixes gear Z9 on shaft S3, synchronizer SY1 on the right side fixes gear Z11 on shaft S3; synchronizer SY2 is installed between gears Z14 and Z17 and installed on the input shaft S3, synchronizer SY2 on the left side fixes gear Z14 on shaft S3, synchronizer SY2 on the right side fixes gear Z17 on shaft S3; synchronizer SY3 is installed between gears Z18 and Z19 and installed on the output shaft S8, synchronizer SY3 on the left side fixes gear Z18 on shaft S8, synchronizer SY3 on the right side fixes gear Z19 on shaft S8. The auxiliary transmission can realize 3 auxiliary speed gears by operating the synchronizer SY3 on the left side, and the synchronizer SY1 on the left and right sides or the synchronizer SY2 on the right side; by operating the synchronizer SY3 on the right side, and the synchronizer SY1 on the left and right sides or the synchronizer SY2 on the right side, another 3 different auxiliary speed gears can be realized; by operating the synchronizer SY2 on the left side, and the synchronizer SY3 on the left and right sides, 2 auxiliary speed reverse gears can be realized. Therefore, the auxiliary speed shift mechanism 2 scheme can realize 6 forward gears and 2 reverse gears. Combined with the main speed shift mechanism 1, such as Figure 3 The transmission shown can achieve 24 forward gears and 8 reverse gears through the gear combination of the main and auxiliary transmissions.

[0055] Embodiment 4:

[0056] like Figure 4 As shown, this scheme is Figure 1The scheme shown shows another way of auxiliary speed shift mechanism 2, including: 13 gear sets, 5 sets of shaft systems, and 4 sets of synchronizers. The 5 sets of shaft systems, the input shaft S3 of the auxiliary speed shift mechanism 2 is the output shaft of the main speed shift mechanism 1, the intermediate shaft S5, shaft S4, and shaft S6 are arranged parallel to the input shaft S3 with a fixed center distance, and the output shaft S8 is arranged coaxially with the intermediate shaft S4; gears Z9, Z11, Z15, and Z18 are respectively loosely sleeved on the input shaft S3, gears Z10, Z12, Z16, and Z19 are respectively fixed on the intermediate shaft S4, and gears Z13 and Z17 are respectively loosely sleeved on the shaft S6. Gear Z21 is fixed on shaft S6, gear Z14 is fixed on intermediate shaft S5, gear Z20 is loosely sleeved on output shaft S8, wherein gears Z9 and Z10 are meshed with each other, gears Z11 and Z12 are meshed with each other, gears Z15 and Z16 are meshed with each other, gears Z18 and Z19 are meshed with each other, gears Z12 and Z14 are meshed with each other, gears Z13 and Z14 are meshed with each other, gears Z16 and Z17 are meshed with each other, and gears Z20 and Z21 are meshed with each other; A set of synchronizers, synchronizer SY1 is installed between gears Z9 and Z11 and installed on the input shaft S3. When synchronizer SY1 is on the left, gear Z9 is fixed on the shaft S3, and when synchronizer SY1 is on the right, gear Z11 is fixed on the shaft S3; synchronizer SY2 is installed between gears Z15 and Z18 and installed on the input shaft S3. When synchronizer SY2 is on the left, gear Z15 is fixed on the shaft S3, and when synchronizer SY2 is on the right, gear Z18 is fixed on the shaft S3; synchronizer SY3 is installed between gears Z13 and Z17 and installed on shaft S6. When synchronizer SY3 is on the left, gear Z13 is fixed on the shaft S6, and when synchronizer SY3 is on the right, gear Z17 is fixed on the shaft S6; synchronizer SY4 is installed between gears Z19 and Z20 and installed on shaft S8. When synchronizer SY4 is on the left, gear Z19 is fixed on the shaft S8, and when synchronizer SY4 is on the right, gear Z20 is fixed on the shaft S8. The auxiliary transmission can realize 4 auxiliary speed gears by operating the synchronizer SY4 on the left side and the synchronizer SY1 or SY2 on the left and right sides respectively; it can realize another 4 different auxiliary speed gears by operating the synchronizer SY3 and SY4 on the right side and the synchronizer SY1 or SY2 on the left and right sides respectively; it can realize 4 auxiliary speed reverse gears by operating the synchronizer SY3 on the left side and SY4 on the right side and the synchronizer SY1 or SY2 on the left and right sides respectively. Therefore, the auxiliary speed shift mechanism 2 scheme can realize 8 gears and 4 reverse gears. Combined with the main speed shift mechanism 1, as Figure 4 The transmission shown can achieve 32 forward gears and 16 reverse gears through the gear combination of the main and auxiliary transmissions.

[0057] Furthermore, if Figure 5 As shown in the attached Figure 2The main transmission shift mechanism and Figure 3 The auxiliary transmission shift mechanism shown can integrate a transmission scheme that can achieve 24 forward gears and 8 reverse gears.

[0058] Furthermore, if Figure 6 As shown, using Figure 2 The main transmission shift mechanism and Figure 4 The auxiliary transmission shift mechanism shown can integrate a transmission scheme that can achieve 32 forward gears and 16 reverse gears.

[0059] Embodiment 5:

[0060] Reference Figure 7As shown in Figures 8 and 9, a lubrication assembly 6 may be installed on the first input shaft 11, and the lubrication assembly 6 includes an annular frame 61, a through hole 62 is provided in the middle of the frame 61 to be sleeved with the first input shaft 11, and a plurality of cavities 63 are arranged on the outside of the frame 61 around the through hole 62, and an oil injection sleeve is installed between the cavities 63, one end of the oil injection sleeve is aligned with the through hole 62, and an oil injection assembly 65 is installed in the oil injection sleeve, and the oil injection assembly 65 includes a shell 651, an oil chamber 652 is provided at the center of the shell 651, and the oil chamber 652 is a blind hole and a spring 653 is installed at the bottom, and a rubber column 654 is fixedly connected to one end of the spring 653, and a piston sleeve 657 is installed at the connection near the spring 653 on the rubber column 654, and the piston sleeve 657 is matched with the inner diameter of the oil chamber 652 so that when the spring 653 is stretched, the piston sleeve 657 can prevent the lubricating oil in the oil chamber 652 from entering the spring. As for the part 653, an oil channel 656 is provided at one end of the rubber column 654 close to the opening of the oil chamber 652, and an inclined hole is provided on the side of the oil channel 656 at the end inside the rubber column 654. At the same time, an injection head 66 is provided at the end of the rubber column 654, and the injection head 66 includes a positioning sleeve 661 fixed to the end of the rubber column 654. A stepped hole body is provided inside the positioning sleeve 661, and a sliding block 662 is provided in the hole body. Balls 663 are mounted on the bottom of the sliding block 662 and the step surface of the hole body inside the positioning sleeve 661. The sliding block 662 is provided in the hole body and can rotate circumferentially relative to the positioning sleeve 661. The rubber column 654 is provided on the oil chamber 652 in the oil injection assembly 65 to compress the lubricating oil flow surface, so as to increase the pressure inside the flow pipeline or ensure the pressure when the lubricating oil flows, thereby ensuring the subsequent injection pressure of the lubricating oil. The cooperation of the spring 653 and the piston sleeve 657 can make the rubber column 654 move inside the lubricating oil circulation channel, thereby helping to remove the residue or sludge inside the channel. The reciprocating displacement of the rubber column 654 relative to the spring 653 also has a pushing effect on the spray head 66 at the end of the rubber column 654, thereby promoting the discharge of the internal lubricating oil. By setting an inclined hole and an inner cavity at the end of the rubber column 654, part of the lubricating oil can be intercepted at the end of the rubber column 654, so that the subsequent lubricating oil can drip or discharge slowly, thereby achieving continuous lubrication of the input shaft S1, and the end of the rubber column 654 retains part of the lubricating oil, which can achieve a quick response effect for subsequent lubrication. Since the injection head 66 can be displaced and the injection head 66 abuts against the bearing on the input shaft S1 segment, the injection head 66 can be elastically displaced relative to the rubber column 654. For the four oil injection components 65 abutting against the input shaft S1 segment, the spring 653, the rubber column 654 and the injection head 66 can be used to ensure the axial stability of the input shaft S1, that is, to reduce the circular runout of the input shaft S1 rotation. If runout occurs, the energy generated by the runout can be transmitted through the injection head 66 and absorbed and consumed by the rubber column 654 and the spring 653.The purpose of providing the injection head 66 is to avoid the bearing on the input shaft S1 placed directly on the injection surface from being unable to inject the lubricating oil to the effective range. The injection head 66 includes a positioning sleeve 661 that can be displaced relative to the end of the oil injection base, and the positioning sleeve 661 is provided with a stepped hole body inside, and is equipped with a sliding block 662, and the sliding block 662 is rollingly connected to the hole body through a ball 663. The side of the positioning sleeve 661 is an arc-shaped structure, which is adapted to the interior of the shell sleeve 651. When the rubber column 654 is displaced, the positioning sleeve 661 can be driven to rotate within a certain angle, and the sliding block 662 can rotate relative to the positioning sleeve 661. The circular runout of the input shaft S1 can be reduced by the offset of the positioning sleeve 661 and the rotation of the sliding block 662. Under the action of the lubricating oil pressure, the sliding block 662 can cause the sliding block 662 to rotate relative to the ball 663, thereby causing the ejected lubricating oil to be discharged in a swirl state, thereby increasing the injection range and avoiding continuous lubrication injection at a single point. Changes in the sliding distance of the positioning sleeve 661 will lead to changes in the injection distance and range.

[0061] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the attached claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any figure mark in the claims should not be regarded as limiting the claims involved.

Claims

1. A tractor power shift transmission, comprising: a main speed shift mechanism (1); an output end of the main speed shift mechanism (1) is connected to an auxiliary speed shift mechanism (2); a plurality of clutches are provided on the main speed shift mechanism (1); and gear shifting is performed by reciprocating movement of the clutches along an axis, wherein: The main speed change gear shifting mechanism (1) comprises a first input shaft (11) and a first output shaft (13) arranged coaxially with the first input shaft (11), wherein power is transmitted between the first input shaft (11) and the first output shaft (13) via a plurality of gear sets and a plurality of clutches; A first intermediate shaft (12) is provided on one side of the first input shaft (11), and a first gear set, a second gear set, a third gear set and a fourth gear set are mounted on the first input shaft (11) and the first intermediate shaft (12) in order from left to right; One end of the first output shaft (13) is connected to a second input shaft (21); one end of the second input shaft (21) is provided with a coaxial second intermediate shaft (22); one side of the second input shaft (21) is provided with an idler shaft (23); and a second output shaft (24) is provided on a side of the second input shaft (21) away from the idler shaft (23); A lubrication assembly (6) is mounted on the first input shaft (11). The lubrication assembly (6) comprises an annular frame (61). A through hole (62) is provided in the middle of the frame (61) and is sleeved with the first input shaft (11). A plurality of cavities (63) are arranged on the outside of the frame (61) surrounding the through hole (62). Oil injection sleeves are mounted between the cavities (63). One end of the oil injection sleeve is aligned with the through hole (62). An oil injection assembly (65) is mounted in the oil injection sleeve.

2. A tractor power shift transmission according to claim 1, characterized in that: The clutch (3) comprises a first wet clutch (31) arranged between the first input shaft (11) and the first output shaft (13); a second wet clutch (32) is arranged on the first intermediate shaft (12) and the second gear set; a third wet clutch (33) is arranged between the first intermediate shaft (12) and the third gear set; and a fourth wet clutch (34) is arranged between the fourth gear set and the first output shaft (13).

3. A tractor power shift transmission according to claim 2, characterized in that: The second wet clutch (32) and the third wet clutch (33) share a common input terminal.

4. A tractor power shift transmission according to claim 1, characterized in that: In order from left to right, a fifth gear set and a sixth gear set are mounted on the second input shaft (21) and the second output shaft (24), a seventh gear set is mounted on the second input shaft (21) and the idler shaft (23), an eighth gear set is mounted on the second output shaft (24) and the idler shaft (23), a ninth gear set is mounted on the second intermediate shaft (22) and the second output shaft (24), the seventh gear set and the eighth gear set are arranged on the same horizontal plane, and the two gear sets share a planetary gear, and a tenth gear set is mounted on the idler shaft (23) and the second intermediate shaft (22).

5. A tractor power shift transmission according to claim 4, characterized in that: The auxiliary speed change shifting mechanism (2) comprises at least one first synchronizer (51) which is used to fixedly connect a fifth gear set and a sixth gear set arranged on the second output shaft (24) to the second output shaft (24).

6. A tractor power shift transmission according to claim 5, characterized in that: The auxiliary speed change shifting mechanism (2) comprises at least one second synchronizer (52) for fixedly connecting a seventh gear set and an eighth gear set arranged on the second output shaft (24) to the second output shaft (24).

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