A transmission mechanism combining power shifting and mechanical shifting and tractor

Abstract

The present invention relates to a transmission mechanism and a tractor combining power shift and mechanical shift, and relates to the field of transmission devices. The main speed shift assembly of the transmission mechanism includes a main speed clutch, the overdrive shift assembly includes an overdrive clutch, the main speed clutch and the overdrive clutch are both hydraulically driven, the crawler shift assembly includes a crawler engagement sleeve, the auxiliary speed shift assembly includes an auxiliary speed synchronizer, and the crawler engagement sleeve and the auxiliary speed synchronizer are both mechanically driven. The tractor includes the transmission mechanism combining power shift and mechanical shift. The present invention adopts a combination of power shift and mechanical shift, which can not only maintain power continuity during shifting, improve traction and fuel economy, but also reduce the cost of full power shift. At the same time, the combination method improves the comfort and adaptability of operation, so that the tractor can operate efficiently under various operating conditions.

Description

Technical Field

[0001] The invention relates to the field of transmission devices, and in particular to a transmission mechanism combining power shifting and mechanical shifting, and a tractor. Background Art

[0002] At present, the speed of tractors is limited by the working space and route conditions, making it difficult to give full play to the fuel economy and traction of the engine. Traditional mechanical gear shifting requires power interruption during gear shifting, resulting in traction fluctuations and affecting work efficiency; while full power shifting solves the power interruption problem, it is expensive and has insufficient transmission efficiency under certain working conditions. Therefore, a solution is needed that can optimize fuel economy and traction while taking into account ease of operation and cost-effectiveness. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a gearbox which is efficient, economical and highly adaptable.

[0004] The technical solution of the present invention to solve the above technical problems is as follows: a transmission mechanism combining power shifting and mechanical shifting, comprising a main speed shifting assembly, a crawler gear shifting assembly, a secondary speed shifting assembly, an overdrive gear shifting assembly, a power input shaft and a power output shaft, wherein the power input shaft, the main speed shifting assembly, the crawler gear shifting assembly, the secondary speed shifting assembly and the power output shaft are sequentially connected in transmission, and the overdrive gear shifting assembly is respectively connected in transmission with the power input shaft and the power output shaft, the main speed shifting assembly comprises a main speed clutch, the overdrive gear shifting assembly comprises an overdrive gear clutch, the main speed clutch and the overdrive gear clutch are both hydraulically driven, the crawler gear shifting assembly comprises a crawler gear engagement sleeve, the secondary speed shifting assembly comprises a secondary speed synchronizer, and the crawler gear engagement sleeve and the secondary speed synchronizer are both mechanically driven.

[0005] The beneficial effects of the present invention are as follows: the main transmission clutch and the overdrive clutch are both hydraulically driven, that is, the gears are shifted by power shifting; the crawler gear engagement sleeve and the auxiliary transmission synchronizer are both mechanically driven, that is, the gears are shifted by mechanical shifting. The present invention adopts a combination of power shifting and mechanical shifting, which can not only maintain power continuity during gear shifting, improve traction and fuel economy, but also reduce the cost of full power shifting. At the same time, this combination improves the comfort and adaptability of operation, so that the tractor can operate efficiently under various operating conditions. In addition, the auxiliary transmission adopts mechanical shifting, which has low production cost, small space occupation, and can reduce the wheelbase of the whole vehicle.

[0006] In addition, the present invention adds an overdrive shift assembly in the transmission mechanism, so that the overdrive clutch can be engaged and switched to the overdrive gear during tractor transportation, so that the power input shaft and the power output shaft are connected and transmit power, thereby improving the speed ratio, increasing the transportation speed of the tractor, and improving fuel economy, thus filling a technical gap.

[0007] Based on the above technical solution, the present invention can also be improved as follows.

[0008] Further, the main transmission shift assembly also includes a reverse gear driving gear, a reverse gear idler, a reverse gear idler shaft, a reverse gear driven gear, a high gear driving gear, a high gear driven gear, a low gear driving gear, a low gear driven gear, a third gear driving gear, an intermediate shaft, a first gear driven gear, a second gear driven gear, a third gear driven gear and a main transmission output shaft, the main transmission clutch includes a reverse gear clutch, a high and low gear clutch, a first gear clutch and a second and third gear clutch, the reverse gear driving gear, the high gear driving gear and the low gear driving gear are all rotatably connected to the power input shaft, the reverse gear clutch is mounted on the power input shaft and is engaged with or disengaged from the reverse gear driving gear, the high and low gear clutch is mounted on the power input shaft and is located between the high gear driving gear and the low gear driving gear, the high and low gear clutch is engaged with one of the high gear driving gear and the low gear driving gear, or is disengaged from both the high gear driving gear and the low gear driving gear, the reverse gear idler is rotatably connected to the reverse gear idler shaft, The reverse gear driven gear, the high gear driven gear, the low gear driven gear and the third gear driving gear are all fixedly connected to the intermediate shaft; the reverse gear idler gear meshes with the reverse gear driving gear and the reverse gear driven gear respectively; the high gear driving gear meshes with the high gear driven gear; the low gear driving gear meshes with the low gear driven gear; the first gear driven gear, the second gear driven gear and the third gear driven gear are all rotationally connected to the main transmission output shaft; the first gear clutch and the second and third gear clutches are all installed on the main transmission output shaft; the first gear clutch is engaged with or disengaged from the first gear driven gear; the second and third gear clutches are engaged with one of the second gear driven gear and the third gear driven gear, or are disengaged from the second gear driven gear and the third gear driven gear; the reverse gear driven gear meshes with the first gear driven gear; the high gear driven gear meshes with the second gear driven gear; and the third gear driving gear meshes with the third gear driven gear.

[0009] The beneficial effect of adopting the above further scheme is that the main transmission shift assembly adopts three main shafts, namely the power input shaft, the intermediate shaft and the main transmission output shaft, the main transmission clutch and the corresponding gears to realize the switching of reverse gear, high gear and low gear, as well as the switching of first gear, second gear and third gear. Due to space limitations, the traditional two-shaft transmission structure has a large transmission gear diameter, which leads to a large volume and increased weight of the gearbox. This scheme optimizes the power transmission path by introducing an intermediate shaft, so that the diameter of the transmission gear can be significantly reduced. This not only reduces the inertia of the gear, but also reduces the friction loss when the gears are engaged, thereby improving the transmission efficiency; it also makes installation more convenient, reduces the complexity and precision requirements during assembly, and reduces production costs and maintenance difficulties. The three-shaft structure provides greater flexibility for the arrangement of gears, so that the gears can be more reasonably distributed inside the gearbox, making full use of space. The transmission route of the main transmission is innovative, and more gears can be set to obtain more shifting speeds, covering all tractor working speeds, and has strong work adaptability.

[0010] Further, the crawler gear shift assembly also includes a crawler gear primary driving gear, a crawler gear primary passive gear, a crawler gear secondary driving gear, a crawler gear secondary passive gear and a crawler gear output gear, the crawler gear primary driving gear is fixedly connected to the output end of the main speed change shift assembly, one end of the crawler gear output gear is fixed with a crawler gear gear shaft, the crawler gear output gear is rotationally connected to the power output shaft, the crawler gear secondary passive gear is rotationally connected to the crawler gear gear shaft, the crawler gear engagement sleeve is installed on the crawler gear shaft, the crawler gear engagement sleeve is engaged with one of the crawler gear primary driving gear and the crawler gear secondary passive gear, or is separated from both the crawler gear primary driving gear and the crawler gear secondary passive gear, the crawler gear primary passive gear and the crawler gear secondary driving gear are coaxially arranged and fixedly connected, the crawler gear primary driving gear is meshed with the crawler gear primary passive gear for transmission, and the crawler gear secondary driving gear is meshed with the crawler gear secondary passive gear for transmission.

[0011] The beneficial effects of adopting the above further scheme are: crawling gear 1 and crawling gear 2 can be switched by switching the crawling gear engagement sleeve. Setting the crawling gear can: provide extremely low-speed operation capability, enhance traction, and adapt to complex terrain; enable the engine to maintain efficient operation under low-speed and high-load conditions, avoid fuel waste caused by excessive speed, and thus optimize fuel economy; when descending a steep slope, the crawling gear can use engine resistance to control vehicle speed and reduce dependence on the braking system; improve operational flexibility and extend the life of the transmission system, so that the tractor performs better under low-speed, high-load and complex conditions, while improving economy and reliability. In this scheme, after engaging the crawling gear 2, the main and auxiliary transmissions are switched, and the output speed range of the power output shaft is 0.2-2km / h, which can achieve ultra-low speed and high torque operation, and adapt to more different needs of the domestic market.

[0012] Further, the auxiliary transmission shift assembly also includes an auxiliary transmission driving shaft, an auxiliary transmission constantly meshing driven gear, an A gear driving gear and an A gear driven gear, the auxiliary transmission synchronizer includes a first synchronizer, the auxiliary transmission constantly meshing driven gear and the A gear driving gear are both fixedly connected to the auxiliary transmission driving shaft, the A gear driven gear is rotationally connected to the power output shaft, the first synchronizer is mounted on the power output shaft, the first synchronizer is engaged with one of the crawler gear output gear and the A gear driven gear, or is separated from both the crawler gear output gear and the A gear driven gear, the crawler gear output gear is meshed with the auxiliary transmission constantly meshing driven gear for transmission, and the A gear driving gear is meshed with the A gear driven gear for transmission.

[0013] The beneficial effect of adopting the above further scheme is: the first synchronizer is used to switch between D gear and A gear, and the auxiliary transmission shift assembly uses two shafts to achieve multi-speed shifting, providing more gears, making the tractor more flexible and adaptable under different working conditions.

[0014] Further, the auxiliary transmission shift assembly also includes a B gear driving gear, a B gear passive gear, a C gear driving gear and a C gear passive gear, and the auxiliary transmission synchronizer also includes a second synchronizer, the B gear driving gear and the C gear driving gear are both fixedly connected to the auxiliary transmission driving shaft, the B gear passive gear and the C gear passive gear are both rotationally connected to the power output shaft, the second synchronizer is installed on the power output shaft, the second synchronizer is engaged with one of the B gear passive gear and the C gear passive gear, or is separated from the B gear passive gear and the C gear passive gear, the B gear driving gear and the B gear passive gear are meshed for transmission, and the C gear driving gear and the C gear passive gear are meshed for transmission.

[0015] The beneficial effects of adopting the above further scheme are: the second synchronizer is used to switch between B gear and C gear, and the auxiliary transmission significantly expands the speed range of the tractor by increasing the gears, so that it can adapt to various operating requirements from very low speed to high speed. The multi-gear auxiliary transmission enables the transmission mechanism to select the best gear according to the load and speed requirements, reduces the load fluctuation under extreme working conditions, reduces the wear of the transmission system, and prolongs the service life of the gearbox and transmission components.

[0016] Furthermore, the transmission mechanism of the power shift and mechanical shift combination also includes a four-wheel drive switching component, which includes a four-wheel drive driving gear, a four-wheel drive idler, a four-wheel drive idler shaft, a four-wheel drive driven gear, a four-wheel drive clutch and a front axle drive shaft, the four-wheel drive driving gear is fixedly connected to the power output shaft, the four-wheel drive idler is rotatably connected to the four-wheel drive idler shaft, the four-wheel drive driven gear is rotatably connected to the front axle drive shaft, the four-wheel drive clutch is installed on the front axle drive shaft and engages or disengages with the four-wheel drive driven gear, and the four-wheel drive driving gear, the four-wheel drive idler and the four-wheel drive driven gear are meshed and transmitted in sequence.

[0017] The beneficial effect of adopting the above further scheme is that when the four-wheel drive clutch is engaged with the four-wheel drive passive gear, it can be switched to the four-wheel drive mode. While the power is output to the rear axle through the power output shaft, it can also be output to the front axle through the front axle drive shaft.

[0018] Furthermore, the four-wheel drive clutch is hydraulically driven.

[0019] Furthermore, the overdrive shift assembly also includes an overdrive driving gear, an overdrive idler, an overdrive idler shaft and an overdrive driven gear, the overdrive driving gear is rotationally connected to the power input shaft, the overdrive clutch is installed on the power input shaft, the overdrive clutch is engaged or disengaged from the overdrive driving gear, the overdrive idler is rotationally connected to the overdrive idler shaft, the overdrive driven gear is fixedly connected to the power output shaft, and the overdrive driving gear, the overdrive idler and the overdrive driven gear are meshed and transmitted in sequence.

[0020] The beneficial effect of adopting the above further scheme is that when the overdrive clutch is engaged with the overdrive driving gear, the overdrive gear is switched to the overdrive gear, the power input shaft and the power output shaft are connected and transmit power, the speed ratio is improved, and the transportation speed of the tractor is increased.

[0021] Furthermore, the transmission mechanism of the power shift and mechanical shift combination also includes a rear axle, and the power output shaft is drivingly connected to the rear axle.

[0022] The present invention also provides a tractor, comprising the transmission mechanism combining power shifting and mechanical shifting. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram of a transmission mechanism combining power shifting and mechanical shifting according to the present invention;

[0024] Figure 2 It is a schematic diagram of the main speed shifting assembly of the present invention;

[0025] Figure 3 The schematic diagram of the crawler gear shift assembly and the auxiliary speed shift assembly of the present invention;

[0026] Figure 4 It is a schematic diagram of the four-wheel drive switching assembly of the present invention;

[0027] Figure 5 It is a schematic diagram of the overdrive gear shift assembly of the present invention.

[0028] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0029] 100. Main speed shifting assembly; 101. Reverse gear driving gear; 102. Reverse idler; 103. Reverse driven gear; 104. Reverse clutch; 105. High gear driving gear; 106. High gear driven gear; 107. Low gear driving gear; 108. Low gear driven gear; 109. High and low gear clutch; 110. Third gear driving gear; 111. Intermediate shaft; 112. First gear clutch; 113. First gear driven gear; 114. Second gear driven gear; 115. Second and third gear clutch; 116. Third gear driven gear; 117. Main speed output shaft;

[0030] 200, crawler gear shift assembly; 201, crawler gear primary driving gear; 202, crawler gear primary passive gear; 203, crawler gear secondary driving gear; 204, crawler gear secondary passive gear; 205, crawler gear engagement sleeve; 206, crawler gear output gear;

[0031] 300, auxiliary speed change shift assembly; 301, auxiliary speed change driving shaft; 302, auxiliary speed change constantly meshing passive gear; 303, A gear driving gear; 304, A gear passive gear; 305, first synchronizer; 306, B gear driving gear; 307, B gear passive gear; 308, C gear driving gear; 309, C gear passive gear; 310, second synchronizer;

[0032] 400, four-wheel drive switching assembly; 401, four-wheel drive driving gear; 402, four-wheel drive idler; 403, four-wheel drive passive gear; 404, four-wheel drive clutch; 405, front axle drive shaft;

[0033] 500, overdrive gear shift assembly; 501, overdrive clutch; 502, overdrive driving gear; 503, overdrive idler gear; 504, overdrive driven gear;

[0034] 600, rear axle;

[0035] 700, power input shaft;

[0036] 800. Power output shaft. DETAILED DESCRIPTION

[0037] The principles and features of the present invention are described below. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0038] Embodiment 1

[0039] like Figure 1-Figure 5 As shown, this embodiment provides a transmission mechanism of a power shift and a mechanical shift combination, comprising a main speed shift assembly 100, a crawler gear shift assembly 200, a sub-speed shift assembly 300, an overdrive gear shift assembly 500, a power input shaft 700 and a power output shaft 800, wherein the power input shaft 700, the main speed shift assembly 100, the crawler gear shift assembly 200, the sub-speed shift assembly 300 and the power output shaft 800 are sequentially connected in transmission, and the overdrive gear shift assembly 500 is respectively connected to the main speed shift assembly 100, the crawler gear shift assembly 200, the sub-speed shift assembly 300 and the power output shaft 800. The power input shaft 700 is transmission-connected with the power output shaft 800, the main speed shift assembly 100 includes a main speed clutch, the overdrive shift assembly 500 includes an overdrive clutch 501, both the main speed clutch and the overdrive clutch 501 are hydraulically driven, the crawler gear shift assembly 200 includes a crawler gear engagement sleeve 205, the auxiliary speed shift assembly 300 includes an auxiliary speed synchronizer, and both the crawler gear engagement sleeve 205 and the auxiliary speed synchronizer are mechanically driven.

[0040] The beneficial effects of this embodiment are as follows: the main transmission clutch and the overdrive clutch 501 are both hydraulically driven, that is, the gears are shifted by power shifting; the crawler gear engagement sleeve 205 and the auxiliary transmission synchronizer are both mechanically driven, that is, the gears are shifted by mechanical shifting (for example, two shift rods are provided that are transmission-connected to the crawler gear engagement sleeve 205 and the auxiliary transmission synchronizer, and the crawler gear engagement sleeve 205 and the auxiliary transmission synchronizer are operated by the corresponding shift rods to shift gears). The present invention adopts a combination of power shifting and mechanical shifting, which can not only maintain power continuity during gear shifting, improve traction and fuel economy, but also reduce the cost of full power shifting. At the same time, this combination improves the comfort and adaptability of operation, so that the tractor can operate efficiently under various operating conditions. In addition, the auxiliary transmission adopts mechanical shifting, which has low production cost, small space occupation, and can reduce the wheelbase of the whole vehicle.

[0041] In addition, the present invention adds an overdrive shift assembly 500 in the transmission mechanism. When the tractor is transported, the overdrive clutch 501 can be engaged and switched to the overdrive gear. The power input shaft 700 and the power output shaft 800 are connected and transmit power, thereby improving the speed ratio, increasing the transportation speed of the tractor, and improving fuel economy, thus filling a technical gap.

[0042] Specifically, the power input shaft 700 and the power output shaft 800 are both rotatably mounted in the gearbox housing via bearings.

[0043] Among them, the structures of the main transmission clutch, the overdrive clutch 501, the crawler gear engagement sleeve 205 and the auxiliary transmission synchronizer all belong to the prior art and will not be described in detail here.

[0044] Embodiment 2

[0045] Based on the first embodiment, Figure 2As shown, the main speed change shift assembly 100 also includes a reverse gear driving gear 101, a reverse gear idler 102, a reverse gear idler shaft, a reverse gear driven gear 103, a high gear driving gear 105, a high gear driven gear 106, a low gear driving gear 107, a low gear driven gear 108, a third gear driving gear 110, an intermediate shaft 111, a first gear driven gear 113, a second gear driven gear 114, a third gear driven gear 116 and a main speed change output shaft 117, and the main speed change clutch includes a reverse gear clutch 104, a high and low gear clutch 109, a first gear clutch 112 and a second and third gear clutch 115, the reverse gear driving gear 101, the high gear driving gear 105, the high gear driven gear 106, the low gear driving gear 107, the low gear driven gear 108, the third gear driving gear 110, the intermediate shaft 111, the first gear driven gear 113, the second gear driven gear 114, the third gear driven gear 116 and the main speed change output shaft 117, and the main speed change clutch includes a reverse gear clutch 104, a high and low gear clutch 109, a first gear clutch 112 and a second and third gear clutch 115. 5 and the low gear driving gear 107 are both rotatably connected to the power input shaft 700, the reverse gear clutch 104 is mounted on the power input shaft 700, and is engaged with or disengaged from the reverse gear driving gear 101, the high-low gear clutch 109 is mounted on the power input shaft 700, and is located between the high gear driving gear 105 and the low gear driving gear 107, the high-low gear clutch 109 is engaged with one of the high gear driving gear 105 and the low gear driving gear 107, or is disengaged from both the high gear driving gear 105 and the low gear driving gear 107, the reverse gear idler 102 is rotatably connected to the reverse gear idler shaft The reverse gear driven gear 103, the high gear driven gear 106, the low gear driven gear 108 and the third gear driving gear 110 are all fixedly connected to the intermediate shaft 111, the reverse gear idler 102 is meshed with the reverse gear driving gear 101 and the reverse gear driven gear 103 respectively, the high gear driving gear 105 is meshed with the high gear driven gear 106, the low gear driving gear 107 is meshed with the low gear driven gear 108, the first gear driven gear 113, the second gear driven gear 114 and the third gear driven gear 116 are all rotatably connected to the main transmission output shaft 117, the first gear driven gear 114 is meshed with the high gear driven gear 114, and the third gear driven gear 116 are all rotatably connected to the main transmission output shaft 117. The clutch 112 and the second- and third-speed clutch 115 are both mounted on the main transmission output shaft 117; the first-speed clutch 112 is engaged with or disengaged from the first-speed driven gear 113; the second- and third-speed clutch 115 is engaged with one of the second-speed driven gear 114 and the third-speed driven gear 116, or is disengaged from both the second-speed driven gear 114 and the third-speed driven gear 116; the reverse-speed driven gear 103 is meshed with the first-speed driven gear 113 for transmission; the high-speed driven gear 106 is meshed with the second-speed driven gear 114 for transmission; and the third-speed driving gear 110 is meshed with the third-speed driven gear 116 for transmission.

[0046] The main transmission shift assembly 100 uses three main shafts, namely, the power input shaft 700, the intermediate shaft 111 and the main transmission output shaft 117, the main transmission clutch and the corresponding gears to realize the switching of reverse gear, high gear and low gear, as well as the switching of first gear, second gear and third gear. Due to space limitations, the traditional two-shaft transmission structure has a large transmission gear diameter, which leads to a large volume and increased weight of the gearbox. By introducing the intermediate shaft 111, this solution optimizes the power transmission path, so that the diameter of the transmission gear can be significantly reduced. This not only reduces the inertia of the gear, but also reduces the friction loss when the gears are engaged, thereby improving the transmission efficiency; it also makes installation more convenient, reduces the complexity and precision requirements during assembly, and reduces production costs and maintenance difficulties. The three-shaft structure provides greater flexibility for the arrangement of gears, so that the gears can be more reasonably distributed inside the gearbox, making full use of space. The transmission route of the main transmission is innovative, and more gears can be set to obtain more shifting speeds, covering all tractor working speeds, and has strong work adaptability.

[0047] Specifically, the power input shaft 700, the reverse idler shaft, the intermediate shaft 111 and the main transmission output shaft 117 are parallel to each other.

[0048] The shifting principle of the main transmission shifting assembly 100 is specifically as follows:

[0049] 1. Switching between reverse gear, high gear and low gear:

[0050] (1) Reverse gear: When the reverse gear clutch 104 is engaged with the reverse gear driving gear 101 and the gear is switched to reverse gear, the reverse gear driving gear 101 rotates synchronously with the power input shaft 700, and power is input through the power input shaft 700 and transmitted to the intermediate shaft 111 through the reverse gear driving gear 101, the reverse idler gear 102 and the reverse driven gear 103;

[0051] (2) High gear: When the high-low gear clutch 109 is engaged with the high gear driving gear 105 and the gear is switched to high gear, the high gear driving gear 105 rotates synchronously with the power input shaft 700, and the power is input through the power input shaft 700 and transmitted to the intermediate shaft 111 through the high gear driving gear 105 and the high gear driven gear 106;

[0052] (3) Low gear: When the high-low gear clutch 109 is engaged with the low gear driving gear 107 and the gear is switched to low gear, the low gear driving gear 107 rotates synchronously with the power input shaft 700. The power is input through the power input shaft 700 and transmitted to the intermediate shaft 111 through the low gear driving gear 107 and the low gear driven gear 108.

[0053] 2. Switching between first, second and third gears:

[0054] (1) First gear: When the first gear clutch 112 is engaged with the first gear driven gear 113 and the gear is switched to first gear, the first gear driven gear 113 rotates synchronously with the main transmission output shaft 117, and power is transmitted from the intermediate shaft 111 to the main transmission output shaft 117 through the reverse gear driven gear 103 and the first gear driven gear 113.

[0055] (2) Second gear: When the second / third gear clutch 115 is engaged with the second gear driven gear 114, the gear is switched to the second gear. The second gear driven gear 114 rotates synchronously with the main transmission output shaft 117, and the power is transmitted from the intermediate shaft 111 to the main transmission output shaft 117 through the high gear driven gear 106 and the second gear driven gear 114.

[0056] (3) Third gear: When the second-third gear clutch 115 is engaged with the third gear driven gear 116, the gear is switched to the third gear. The third gear driven gear 116 rotates synchronously with the main transmission output shaft 117. The power is transmitted from the intermediate shaft 111 to the main transmission output shaft 117 through the third gear driving gear 110 and the third gear driven gear 116.

[0057] Embodiment 3

[0058] On the basis of Example 1 or Example 2, Figure 3 As shown, the crawler gear shift assembly 200 also includes a crawler gear primary driving gear 201, a crawler gear primary passive gear 202, a crawler gear secondary driving gear 203, a crawler gear secondary passive gear 204 and a crawler gear output gear 206. The crawler gear primary driving gear 201 is fixedly connected to the output end of the main speed change shift assembly 100, a crawler gear gear shaft is fixed to one end of the crawler gear output gear 206, the crawler gear output gear 206 is rotatably connected to the power output shaft 800, the crawler gear secondary passive gear 204 is rotatably connected to the crawler gear gear shaft, and the crawler gear engagement sleeve 206 is fixedly connected to the output end of the main speed change shift assembly 100. 05 is installed on the crawler gear shaft, the crawler gear engagement sleeve 205 is engaged with one of the crawler gear primary driving gear 201 and the crawler gear secondary passive gear 204, or is separated from the crawler gear primary driving gear 201 and the crawler gear secondary passive gear 204, the crawler gear primary passive gear 202 and the crawler gear secondary driving gear 203 are coaxially arranged and fixedly connected, the crawler gear primary driving gear 201 is meshed with the crawler gear primary passive gear 202 for transmission, and the crawler gear secondary driving gear 203 is meshed with the crawler gear secondary passive gear 204 for transmission.

[0059] This embodiment can switch between crawling gear 1 and crawling gear 2 by switching the crawling gear engagement sleeve 205. Setting the crawling gear can: provide extremely low-speed operation capability, enhance traction, and adapt to complex terrain; enable the engine to maintain efficient operation under low-speed and high-load conditions, avoid fuel waste caused by excessive speed, and thus optimize fuel economy; when descending a steep slope, the crawling gear can use engine resistance to control vehicle speed and reduce dependence on the braking system; improve operational flexibility and extend the life of the transmission system, so that the tractor performs better under low-speed, high-load and complex conditions, while improving economy and reliability. In this solution, after engaging the crawling gear 2, the main and auxiliary transmissions are switched, and the output speed range of the power output shaft 800 is 0.2-2km / h, which can achieve ultra-low speed and high torque operation, and adapt to more different needs of the domestic market.

[0060] The crawler gear primary driving gear 201 is fixedly connected to the output end of the main transmission shift assembly 100 , specifically: the crawler gear primary driving gear 201 is fixedly connected to the main transmission output shaft 117 .

[0061] Specifically, the crawler gear level 1 passive gear 202 and the crawler gear level 2 active gear 203 are fixedly connected via a hollow shaft and are rotatably mounted in the gearbox housing.

[0062] The shifting principle of the crawler gear shift assembly 200 is specifically as follows:

[0063] (1) Crawler gear 1 (or normal gear): When the crawler gear engagement sleeve 205 is engaged with the crawler gear primary driving gear 201, the gear is switched to crawler gear 1, and the power of the main transmission output shaft 117 is directly transmitted to the crawler gear output gear 206 through the crawler gear primary driving gear 201 and the crawler gear engagement sleeve 205;

[0064] (2) Crawling gear 2: When the crawler gear engagement sleeve 205 engages with the crawler gear 204, the gear is switched to crawling gear 2. The crawler gear 204 rotates synchronously with the crawler gear output gear 206 and the crawler gear shaft. The power of the main transmission output shaft 117 passes through the crawler gear 1 driving gear 201, the crawler gear 1 driven gear 202, the crawler gear 2 driving gear 203 and the crawler gear 2 driven gear 204 in sequence and is transmitted to the crawler gear output gear 206.

[0065] Embodiment 4

[0066] Based on the third embodiment, Figure 3As shown, the auxiliary transmission shift assembly 300 also includes an auxiliary transmission driving shaft 301, an auxiliary transmission constantly meshing passive gear 302, an A gear driving gear 303 and an A gear passive gear 304, the auxiliary transmission synchronizer includes a first synchronizer 305, the auxiliary transmission constantly meshing passive gear 302 and the A gear driving gear 303 are both fixedly connected to the auxiliary transmission driving shaft 301, the A gear passive gear 304 is rotationally connected to the power output shaft 800, the first synchronizer 305 is installed on the power output shaft 800, the first synchronizer 305 is engaged with one of the crawler gear output gear 206 and the A gear passive gear 304, or is separated from the crawler gear output gear 206 and the A gear passive gear 304, the crawler gear output gear 206 is meshed with the auxiliary transmission constantly meshing passive gear 302 for transmission, and the A gear driving gear 303 is meshed with the A gear passive gear 304 for transmission.

[0067] In this embodiment, the first synchronizer 305 is used to switch between D gear and A gear, and the auxiliary transmission shift assembly 300 uses two shafts to achieve multi-speed shifting, providing more gears, so that the tractor has higher flexibility and adaptability under different working conditions.

[0068] On the basis of the above scheme, the auxiliary transmission shift assembly 300 also includes a B gear driving gear 306, a B gear passive gear 307, a C gear driving gear 308 and a C gear passive gear 309, and the auxiliary transmission synchronizer also includes a second synchronizer 310, the B gear driving gear 306 and the C gear driving gear 308 are both fixedly connected to the auxiliary transmission driving shaft 301, the B gear passive gear 307 and the C gear passive gear 309 are both rotationally connected to the power output shaft 800, the second synchronizer 310 is installed on the power output shaft 800, the second synchronizer 310 is engaged with one of the B gear passive gear 307 and the C gear passive gear 309, or is separated from the B gear passive gear 307 and the C gear passive gear 309, the B gear driving gear 306 and the B gear passive gear 307 are meshed for transmission, and the C gear driving gear 308 and the C gear passive gear 309 are meshed for transmission.

[0069] In this way, the second synchronizer 310 is used to switch between the B gear and the C gear, and the auxiliary transmission significantly expands the speed range of the tractor by increasing the gears, so that it can adapt to various operating requirements from very low speed to high speed. The multi-gear auxiliary transmission enables the transmission mechanism to select the best gear according to the load and speed requirements, reduces the load fluctuation under extreme working conditions, reduces the wear of the transmission system, and prolongs the service life of the gearbox and transmission components.

[0070] Furthermore, it also includes an AMT shift mechanism, which includes an AMT controller and an AMT shift drive mechanism, the AMT shift drive mechanism is respectively connected to the first synchronizer 305 and the second synchronizer 310 by transmission, and the AMT controller is connected to the AMT shift drive mechanism by communication. The AMT controller is connected to the control button in the cab by communication, and the driver sends a shift signal by operating the control button, and the control button transmits the shift signal to the AMT controller, and the AMT controller controls the AMT shift drive mechanism to move and drives the first synchronizer 305 and the second synchronizer 310 to move, so as to realize the auxiliary speed shift. Among them, the AMT shift drive mechanism can be a linear drive mechanism such as a linear motor, an oil cylinder or a pneumatic cylinder, and the AMT shift drive mechanism can be provided with two, which are connected to the first synchronizer 305 and the second synchronizer 310 by transmission in a one-to-one correspondence.

[0071] Combining AMT shifting with synchronizer shifting, there is no need to manually operate the sub-speed shift lever, and automatic shifting is achieved. Compared with the clutch, the AMT shifting and synchronizer combination has a simple component structure, lighter weight, and low production cost.

[0072] The shifting principle of the auxiliary speed shifting assembly 300 is specifically as follows:

[0073] (1) D gear: When the first synchronizer 305 is engaged with the crawler gear output gear 206, the gear is switched to D gear, the crawler gear output gear 206 rotates synchronously with the power output shaft 800, and the power is directly output to the power output shaft 800 through the crawler gear output gear 206;

[0074] (2) A gear: When the first synchronizer 305 is engaged with the A gear driven gear 304, the gear is switched to A gear. The crawler gear output gear 206 first transmits the power to the auxiliary transmission constantly meshing driven gear 302 and the auxiliary transmission driving shaft 301, and then transmits the power to the A gear driven gear 304 through the A gear driving gear 303 on the auxiliary transmission driving shaft 301. The A gear driven gear 304 transmits the power to the power output shaft 800.

[0075] (3) B gear: When the second synchronizer 310 is engaged with the B gear driven gear 307, the gear is switched to B gear. The crawler gear output gear 206 first transmits the power to the auxiliary transmission constantly meshing driven gear 302 and the auxiliary transmission driving shaft 301, and then transmits the power to the B gear driven gear 307 through the B gear driving gear 306 on the auxiliary transmission driving shaft 301. The B gear driven gear 307 transmits the power to the power output shaft 800.

[0076] (4) C gear: When the second synchronizer 310 engages with the C gear driven gear 309, the gear is switched to C gear. The crawler gear output gear 206 first transmits the power to the auxiliary transmission constantly meshing driven gear 302 and the auxiliary transmission driving shaft 301, and then transmits the power to the C gear driven gear 309 through the C gear driving gear 308 on the auxiliary transmission driving shaft 301. The C gear driven gear 309 transmits the power to the power output shaft 800.

[0077] Embodiment 5

[0078] On the basis of any one of Embodiments 1 to 4, Figure 4 As shown, the transmission mechanism of the power shift and mechanical shift combination also includes a four-wheel drive switching component 400, which includes a four-wheel drive driving gear 401, a four-wheel drive idler wheel 402, a four-wheel drive idler wheel shaft, a four-wheel drive driven gear 403, a four-wheel drive clutch 404 and a front axle transmission shaft 405. The four-wheel drive driving gear 401 is fixedly connected to the power output shaft 800, the four-wheel drive idler wheel 402 is rotationally connected to the four-wheel drive idler wheel shaft, the four-wheel drive driven gear 403 is rotationally connected to the front axle transmission shaft 405, the four-wheel drive clutch 404 is installed on the front axle transmission shaft 405, and is engaged or disengaged with the four-wheel drive driven gear 403, and the four-wheel drive driving gear 401, the four-wheel drive idler wheel 402 and the four-wheel drive driven gear 403 are meshed and transmitted in sequence.

[0079] When the four-wheel drive clutch 404 is engaged with the four-wheel drive passive gear 403 , the four-wheel drive mode is switched to the four-wheel drive mode. The power is output to the rear axle 600 through the power output shaft 800 , and can also be output to the front axle through the front axle drive shaft 405 .

[0080] When the four-wheel drive clutch 404 is separated from the four-wheel drive driven gear 403 , the power output from the front axle drive shaft 405 is disconnected, and the power is only output to the rear axle 600 through the power output shaft 800 .

[0081] Furthermore, the four-wheel drive clutch 404 is hydraulically driven.

[0082] Embodiment 6

[0083] On the basis of any one of Embodiments 1 to 5, Figure 5As shown, the overdrive shift assembly 500 also includes an overdrive driving gear 502, an overdrive idler gear 503, an overdrive idler gear shaft and an overdrive driven gear 504. The overdrive driving gear 502 is rotatably connected to the power input shaft 700. The overdrive clutch 501 is installed on the power input shaft 700. The overdrive clutch 501 is engaged with or disengaged from the overdrive driving gear 502. The overdrive idler gear 503 is rotatably connected to the overdrive idler gear shaft. The overdrive driven gear 504 is fixedly connected to the power output shaft 800. The overdrive driving gear 502, the overdrive idler gear 503 and the overdrive driven gear 504 are meshed and transmitted in sequence.

[0084] When the overdrive clutch 501 is engaged with the overdrive driving gear 502, the overdrive gear is switched to the overdrive gear, and the power input shaft 700 and the power output shaft 800 are connected and directly transmit power, thereby increasing the speed ratio and the transportation speed of the tractor. In the overdrive gear, the power is no longer shifted through the main transmission shift assembly 100, the crawler shift assembly 200 and the auxiliary transmission shift assembly 300, but is directly shifted and output through the overdrive driving gear 502, the overdrive idler gear 503 and the overdrive driven gear 504.

[0085] When the overdrive clutch 501 is separated from the overdrive driving gear 502, the power is input to the main speed shift assembly 100 through the power input shaft 700, and then output to the power output shaft 800 after the main speed shift assembly 100, the crawler gear shift assembly 200 and the auxiliary speed shift assembly 300 are changed in speed.

[0086] In one specific example, the speed ratio of the overdrive driving gear 502 to the overdrive driven gear 504 is 0.31-0.57. In this way, the speed of the tractor in the overdrive gear can be increased to 50 km / h, or even higher, meeting the tractor's requirement for transportation speed.

[0087] More specifically, the speed ratio between the overdrive driving gear 502 and the overdrive driven gear 504 is 0.53.

[0088] In particular, in one specific example, the example includes all the technical features of the first to sixth embodiments, and in the example, the switching of 49+24 gears can be realized. The transmission mechanism of the scheme has rich gears and can adapt to different working conditions. Specifically:

[0089] 1. 49 forward gears include:

[0090] (1) 1 overdrive gear;

[0091] (2) 48 forward gears: 2 (high gear and low gear) * 3 (first gear, second gear and third gear) * 2 (crawling first gear and crawling second gear) * 4 (A gear, B gear, C gear and D gear) = 48. It should be noted that in the above formula, the words in brackets are used to indicate which gears the numbers represent, and the brackets and the numbers in the brackets are not involved in the calculation. In other words, the above formula can be simplified to: 2*3*2*4=48.

[0092] 2. The 24 reverse gears include: 1 (reverse gear) * 3 (first gear, second gear and third gear) * 2 (crawling first gear and crawling second gear) * 4 (A gear, B gear, C gear and D gear) = 24. It should be noted that in the above formula, the words in brackets are used to indicate which gears the numbers represent, and the brackets and the numbers in the brackets are not involved in the calculation. In other words, the above formula can be simplified to: 1*3*2*4=24.

[0093] Embodiment 7

[0094] On the basis of any one of Embodiments 1 to 6, Figure 1 As shown, the transmission mechanism of the power shift and mechanical shift combination further includes a rear axle 600 , and the power output shaft 800 is drivingly connected to the rear axle 600 .

[0095] Specifically, the power output shaft 800 outputs power to the rear axle 600, driving the rear wheels of the rear axle 600 to rotate.

[0096] Embodiment 8

[0097] On the basis of any one of the first to seventh embodiments, this embodiment further provides a tractor, comprising the transmission mechanism combining power shifting and mechanical shifting.

[0098] In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features.

[0099] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0100] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0101] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A transmission mechanism combining power shifting and mechanical shifting, characterized in that: The invention comprises a main speed shift assembly (100), a crawler gear shift assembly (200), a secondary speed shift assembly (300), an overdrive gear shift assembly (500), a power input shaft (700) and a power output shaft (800), wherein the power input shaft (700), the main speed shift assembly (100), the crawler gear shift assembly (200), the secondary speed shift assembly (300) and the power output shaft (800) are sequentially connected in transmission, and the overdrive gear shift assembly (500) is respectively connected to the power input shaft (700) and the crawler gear shift assembly (200). The main transmission gearshift assembly (100) is transmission-connected to the power output shaft (800); the main transmission clutch is included in the main transmission gearshift assembly (100); the overdrive clutch is included in the overdrive clutch (501); the main transmission clutch and the overdrive clutch (501) are both hydraulically driven; the crawler gear engagement sleeve (205) is included in the crawler gear engagement sleeve (205); the auxiliary transmission gearshift assembly (300) is included in the auxiliary transmission synchronizer; the crawler gear engagement sleeve (205) and the auxiliary transmission synchronizer are both mechanically driven.

2. A transmission mechanism combining power shift and mechanical shift according to claim 1, characterized in that: The main speed change shift assembly (100) further comprises a reverse gear driving gear (101), a reverse gear idler gear (102), a reverse gear idler gear shaft, a reverse gear driven gear (103), a high gear driving gear (105), a high gear driven gear (106), a low gear driving gear (107), a low gear driven gear (108), a third gear driving gear (110), an intermediate shaft (111), a first gear driven gear (113), a second gear driven gear (114), a third gear driven gear (116) and a main speed change output shaft (117); the main speed change clutch comprises a reverse gear clutch (104), a high and low gear clutch (109), a first gear clutch (112) and a second and third gear clutch (115); The reverse gear driving gear (101), the high gear driving gear (105) and the low gear driving gear (107) are all rotatably connected to the power input shaft (700); the reverse gear clutch (104) is mounted on the power input shaft (700) and is engaged with or disengaged from the reverse gear driving gear (101); the high-low gear clutch (109) is mounted on the power input shaft (700) and is located between the high gear driving gear (105) and the low gear driving gear (107); the high-low gear clutch (109) is engaged with one of the high gear driving gear (105) and the low gear driving gear (107), or is disengaged from both the high gear driving gear (105) and the low gear driving gear (107); The reverse idler gear (102) is rotationally connected to the reverse idler gear shaft; the reverse driven gear (103), the high-speed driven gear (106), the low-speed driven gear (108) and the third-speed driving gear (110) are all fixedly connected to the intermediate shaft (111); the reverse idler gear (102) is meshed with the reverse driving gear (101) and the reverse driven gear (103) for transmission, the high-speed driving gear (105) is meshed with the high-speed driven gear (106) for transmission, and the low-speed driving gear (107) is meshed with the low-speed driven gear (108) for transmission. The first gear driven gear (113), the second gear driven gear (114) and the third gear driven gear (116) are all rotationally connected to the main transmission output shaft (117); the first gear clutch (112) and the second and third gear clutches (115) are all mounted on the main transmission output shaft (117); the first gear clutch (112) is engaged with or disengaged from the first gear driven gear (113); the second and third gear clutches (115) are engaged with one of the second gear driven gear (114) and the third gear driven gear (116), or are disengaged from both the second gear driven gear (114) and the third gear driven gear (116); the reverse gear driven gear (103) is meshed with the first gear driven gear (113) for transmission; the high gear driven gear (106) is meshed with the second gear driven gear (114) for transmission; and the third gear driving gear (110) is meshed with the third gear driven gear (116) for transmission.

3. The transmission mechanism combining power shift and mechanical shift according to claim 1, characterized in that: The crawler gear shift assembly (200) further comprises a crawler gear primary driving gear (201), a crawler gear primary passive gear (202), a crawler gear secondary driving gear (203), a crawler gear secondary passive gear (204) and a crawler gear output gear (206); the crawler gear primary driving gear (201) is fixedly connected to the output end of the main speed change shift assembly (100); a crawler gear gear shaft is fixed to one end of the crawler gear output gear (206); the crawler gear output gear (206) is rotationally connected to the power output shaft (800); the crawler gear secondary passive gear (204) is rotationally connected to the crawler gear gear shaft; the crawler gear engagement sleeve (206) is fixedly connected to the output end of the main speed change shift assembly (100); a crawler gear gear shaft is fixed to one end of the crawler gear output gear (206); the crawler gear output gear (206) is rotationally connected to the power output shaft (800); the crawler gear secondary passive gear (204) is rotationally connected to the crawler gear gear shaft; and the crawler gear engagement sleeve (206) is fixedly connected to the output end of the main speed change shift assembly (100). 05) is installed on the crawler gear shaft, the crawler gear engagement sleeve (205) is engaged with one of the crawler gear primary driving gear (201) and the crawler gear secondary passive gear (204), or is separated from both the crawler gear primary driving gear (201) and the crawler gear secondary passive gear (204), the crawler gear primary passive gear (202) and the crawler gear secondary driving gear (203) are coaxially arranged and fixedly connected, the crawler gear primary driving gear (201) is meshed with the crawler gear primary passive gear (202) for transmission, and the crawler gear secondary driving gear (203) is meshed with the crawler gear secondary passive gear (204) for transmission.

4. A transmission mechanism combining power shift and mechanical shift according to claim 3, characterized in that: The auxiliary speed change gear shifting assembly (300) further comprises an auxiliary speed change driving shaft (301), an auxiliary speed change constantly meshing passive gear (302), an A gear driving gear (303) and an A gear passive gear (304); the auxiliary speed change synchronizer comprises a first synchronizer (305); the auxiliary speed change constantly meshing passive gear (302) and the A gear driving gear (303) are both fixedly connected to the auxiliary speed change driving shaft (301); the A gear passive gear (304) is rotationally connected to the power output shaft (800); and the first synchronizer (305) is A synchronizer (305) is mounted on the power output shaft (800), the first synchronizer (305) is engaged with one of the crawler gear output gear (206) and the A gear driven gear (304), or is separated from both the crawler gear output gear (206) and the A gear driven gear (304), the crawler gear output gear (206) is meshed with the auxiliary speed change constantly meshing driven gear (302) for transmission, and the A gear driving gear (303) is meshed with the A gear driven gear (304) for transmission.

5. The transmission mechanism combining power shift and mechanical shift according to claim 4, characterized in that: The auxiliary speed change shift assembly (300) further comprises a B-speed driving gear (306), a B-speed driven gear (307), a C-speed driving gear (308) and a C-speed driven gear (309); the auxiliary speed change synchronizer further comprises a second synchronizer (310); the B-speed driving gear (306) and the C-speed driving gear (308) are both fixedly connected to the auxiliary speed change driving shaft (301); the B-speed driven gear (307) and the C-speed driven gear (309) are both rotatably connected to the power output shaft (800); The second synchronizer (310) is connected to the power output shaft (800), the second synchronizer (310) is engaged with one of the B gear driven gear (307) and the C gear driven gear (309), or is separated from both the B gear driven gear (307) and the C gear driven gear (309), the B gear driving gear (306) and the B gear driven gear (307) are meshed for transmission, and the C gear driving gear (308) and the C gear driven gear (309) are meshed for transmission.

6. The transmission mechanism combining power shift and mechanical shift according to claim 1, characterized in that: The invention also comprises a four-wheel drive switching assembly (400), wherein the four-wheel drive switching assembly (400) comprises a four-wheel drive driving gear (401), a four-wheel drive idler wheel (402), a four-wheel drive idler wheel shaft, a four-wheel drive driven gear (403), a four-wheel drive clutch (404) and a front axle transmission shaft (405); the four-wheel drive driving gear (401) is fixedly connected to the power output shaft (800); the four-wheel drive idler wheel (402) is rotationally connected to the four-wheel drive idler wheel shaft; the four-wheel drive driven gear (403) is rotationally connected to the front axle transmission shaft (405); the four-wheel drive clutch (404) is mounted on the front axle transmission shaft (405) and is engaged with or disengaged from the four-wheel drive driven gear (403); the four-wheel drive driving gear (401), the four-wheel drive idler wheel (402) and the four-wheel drive driven gear (403) are meshed and transmitted in sequence.

7. A transmission mechanism combining power shift and mechanical shift according to claim 6, characterized in that: The four-wheel drive clutch (404) is hydraulically driven.

8. The transmission mechanism combining power shift and mechanical shift according to claim 1, characterized in that: The overspeed gear shift assembly (500) further comprises an overspeed gear driving gear (502), an overspeed gear idler (503), an overspeed gear idler shaft and an overspeed gear driven gear (504); the overspeed gear driving gear (502) is rotatably connected to the power input shaft (700); the overspeed gear clutch (501) is mounted on the power input shaft (700); the overspeed gear clutch (501) is engaged with or disengaged from the overspeed gear driving gear (502); the overspeed gear idler (503) is rotatably connected to the overspeed gear idler shaft; the overspeed gear driven gear (504) is fixedly connected to the power output shaft (800); and the overspeed gear driving gear (502), the overspeed gear idler (503) and the overspeed gear driven gear (504) are meshed and transmitted in sequence.

9. A transmission mechanism combining power shift and mechanical shift according to any one of claims 1 to 8, characterized in that: It also includes a rear axle (600), and the power output shaft (800) is drivingly connected to the rear axle (600).

10. A tractor, characterized in that: A transmission mechanism comprising a combination of power shifting and mechanical shifting as described in any one of claims 1 to 9.

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