CN210919988U - Power transmission device and tractor - Google Patents

Abstract

The utility model provides a tractor and a power transmission device thereof, wherein the power transmission device comprises a front frame, a hinge point, a rear frame, a clutch, a speed reducer, a speed changer, a universal transmission device, a front axle and a locking device; the hinged point is arranged between the front frame and the rear frame, and the transmission is arranged on the hinged point; the speed reducer is arranged between the clutch and the transmission, and the universal transmission device is arranged between the front axle and the transmission; the locking device comprises a front-drive locking assembly, and the front-drive locking assembly is arranged in the transmission; the speed changer comprises a speed change component, a front drive component, a main speed reduction component and a power output component, wherein the front drive component is arranged at one end of the speed change component, the main speed reduction component and the power output component are arranged at the other side of the speed change component, power is input into the speed change component, and is output to the front drive component, the main speed reduction component and the power output component respectively after the speed change of the speed change component.

Description

Power transmission device and tractor

Technical Field

The utility model relates to the field of agricultural machinery, in particular to power transmission device and tractor.

Background

The articulated tractor adopts the articulated frame, and the pin joint of frame turns to around the vehicle operation in-process deflects, has to turn to the radius little, and the maneuverability is strong, is the more ideal agricultural machine of southern hills mountain area transportation and paddy field operation in-process.

Articulated tractors are typically longer than wheeled tractors due to the added articulation point in the middle of the frame as a result of using articulated point steering. At present, the articulated hillside tractor widely used in the market is mainly arranged at the rear end of a transmission, and the length of a machine body is difficult to shorten due to the structure. As the horsepower of agricultural machines increases, the engine and its power plant are constructed longer, resulting in an increased length of the airframe, thereby reducing the maneuverability of the articulated vehicle.

In summary, how to provide a tractor and a power transmission device thereof with shorter overall length, stronger driving capability and maneuverability and longer overall service life becomes a technical problem to be solved by the technical personnel in the field.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is: the tractor and the power transmission device thereof have the advantages of shorter length of the whole tractor, stronger driving capability and maneuverability and longer service life.

The utility model discloses a solution is realized like this: the utility model provides a power transmission device, which comprises a front frame, a hinge point, a rear frame, a clutch, a speed reducer, a speed changer, a universal transmission device, a front axle and a locking device; the hinged point is arranged between the front frame and the rear frame, and the transmission is arranged on the hinged point; the speed reducer is arranged between the clutch and the transmission, and the universal transmission device is arranged between the front axle and the transmission; the locking device comprises a front-drive locking assembly, and the front-drive locking assembly is arranged in the transmission; the speed changer comprises a speed change component, a front drive component, a main speed reduction component and a power output component, wherein the front drive component is arranged at one end of the speed change component, the main speed reduction component and the power output component are arranged at the other side of the speed change component, power is input into the speed change component, and is output to the front drive component, the main speed reduction component and the power output component respectively after the speed change of the speed change component. The power transmission device of this structure owing to rearmounted the derailleur and install on the pin joint, consequently, the length of derailleur can not influence the length of whole car, makes the overall structure of tractor more compact, and whole car length is shorter, mobility and through better.

The other technical scheme of the utility model lies in that on the basis, the speed reducer comprises a speed reducing box body, and an input shaft and an output shaft which are arranged in the speed reducing box body, the output shaft and the input shaft are arranged in parallel, the input shaft is connected with the clutch, and the output shaft is connected with the speed changer; the input shaft is provided with an input shaft driving gear, the output shaft is provided with an output shaft driven gear meshed with the input shaft driving gear, when the input shaft rotates, the input shaft driving gear is driven to rotate, the output shaft driven gear rotates to drive the output shaft to rotate, and the transmission is provided with input power.

The other technical scheme of the utility model is that on the basis, the speed change component comprises a reverse gear shaft, an auxiliary input shaft and a middle shaft which are arranged in parallel with the reverse gear shaft, and a reverse gear middle gear is arranged on the reverse gear shaft; the auxiliary input shaft is sequentially provided with a first-gear driving gear, a second-gear driving gear, a third-gear driving gear, a fourth-gear driving gear, a triple gear driven gear, a reverse gear driving gear and a triple gear driving gear; set gradually one on the jackshaft and keep off driven gear, two keep off spline hub, two keep off driven gear, three keep off spline hub, four keep off driven gear, high-speed gear, high-low reverse gear spline hub, low-speed gear, two keep off clutch sleeve, three keep off clutch sleeve, high-low gear clutch sleeve, two keep off shift fork, three keep off shift fork, high-low gear shift fork and general spare.

Another technical solution of the present invention is that, on the basis of the above, the first-gear driving gear, the second-gear driving gear, the third-gear driving gear and the fourth-gear driving gear are sleeved on the auxiliary input shaft through splines; the triple gear driven gear, the reverse gear driving gear and the triple gear driving gear are sleeved on the auxiliary input shaft in a hollow way through a bearing; and a check ring is arranged between the four-gear driving gear and the three-gear driving gear, a check ring is arranged between the two-gear driving gear and the one-gear driving gear, the one-gear driving gear and the bearing are arranged, and a check ring is also arranged between the three-gear driving gear and the bearing.

The other technical scheme of the utility model is that on the basis, the forerunner assembly comprises a forerunner shaft, and the forerunner locking assembly is arranged on the forerunner shaft; the front drive stopping assembly comprises locking pliers, a spring rear seat, a spring front seat, a motor support, a steel sheet, a friction sheet, a clutch hub and a speed reducing motor which are sequentially arranged on the front drive shaft.

Another technical solution of the present invention is that, on the basis of the above, the locking pliers are movably disposed on the output shaft of the speed reduction motor, a thrust bearing is disposed between the locking pliers and the spring rear seat, a spring is disposed between the spring rear seat and the spring front seat, the spring rear seat is disposed outside the steel sheet, and the steel sheet is disposed on the clutch hub through an external spline and can move on the clutch hub; the friction plate is arranged on the auxiliary input shaft through an internal spline and can move on the auxiliary input shaft, and the clutch hub is arranged on the rear drive shaft through a spline.

The utility model discloses an another technical scheme lies in on above-mentioned basis, the main speed reduction subassembly includes the back drive axle, the back drive axle set up in the one end of front drive axle, the epaxial back drive axle driven gear and the back drive initiative bevel gear that sets gradually of back drive, and set up in the main reduction gear of back drive axle one end.

Another technical solution of the present invention is that, on the basis of the above, the power take-off assembly includes a PTO input shaft, a second intermediate shaft, and a PTO shaft, and the PTO input shaft, the second intermediate shaft, and the PTO shaft are arranged in parallel; and a fast gear driving gear, a fast and slow gear spline hub, a slow gear driving gear, a fast and slow gear joint sleeve, a fast and slow gear shifting fork and a fast gear driven gear are sequentially arranged on the PTO input shaft.

The other technical scheme of the utility model lies in that on the basis, a fast gear driven gear, a PTO driving gear and a slow gear driven gear are sequentially arranged on the second intermediate shaft, the fast gear driven gear is used for being meshed with the fast gear driving gear, and the slow gear driven gear is used for being meshed with the slow gear driving gear;

and a PTO shaft driven gear is arranged on the PTO shaft and is used for being meshed with the PTO driving gear.

On the other hand, the utility model also provides a tractor, including power transmission, power transmission is as above power transmission.

Drawings

The accompanying drawings, which form a part hereof, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without undue limitation.

Fig. 1 is a schematic structural view of a tractor according to the present invention;

FIG. 2 is a schematic illustration of the power transmission of FIG. 1;

FIG. 3 is a schematic diagram of the retarder of FIG. 1;

FIG. 4 is a schematic structural diagram of the transmission of FIG. 1;

FIG. 5 is a schematic diagram of a transmission shift configuration;

FIG. 6 is a schematic illustration of the transmission reverse configuration;

FIG. 7 is a schematic illustration of a reverse shift of the transmission;

FIG. 8 is a schematic view of a four-wheel drive configuration of the tractor;

fig. 9 is a schematic diagram of a power output structure of a tractor.

The corresponding relation of the reference signs is as follows:

1 engine 2 chassis 3 frame

4 cab 5 suspension device

31 front frame 32 hinge point 33 rear frame

41 instrument desk 42 operating mechanism 43 seat

51 front counterweight 52 suspension lifter

A front axle B clutch C speed reducer

Universal X part of D-speed transmission E universal transmission device

An input shaft of a C2 reduction box cover C3 of the C1 reduction box body,

C4 output shaft C5 output shaft driven gear

D1 speed changing assembly D2 precursor assembly D3 main speed reducing assembly

D4 power take-off assembly

X1 end cover X2 bearing X3 bolt

X4 sealing ring X5 retaining ring X6 flange

X7 thrust sleeve X8 sleeve X9 end cap

X10 snap ring X11 spring X12 thrust bearing

S0 reverse gear shaft S1 auxiliary input shaft G0 reverse gear intermediate gear

The first gear driving gear G12 second gear driving gear G13 third gear driving gear G11

G14 four-speed driving gear G15 triple gear driven gear G16 reverse driving gear

G17 triple gear driving gear S2 intermediate shaft G21 first gear driven gear

G22 two-gear spline hub G23 two-gear driven gear G24 three-gear driven gear

G25 three-four speed spline hub G26 four speed driven gear G27 high speed gear

G28 high-low reverse spline hub G29 low gear J1 two-gear engaging sleeve

J2 three-four gear engaging sleeve J3 high-low gear engaging sleeve B1 two-gear shifting fork

B2 three-four shift fork B3 high-low shift fork

S3 front drive shaft L front drive locking mechanism

L1 locking clamp L2 spring rear seat L3 spring front seat

L5 steel sheet L6 friction plate of L4 motor support

L8 speed reducing motor of L7 clutch hub

S4 rear drive shaft G41 rear drive shaft driven gear G42 rear drive driving bevel gear

D31 main reducer

S5PTO input shaft G51 fast gear driving gear G52 fast and slow gear spline hub

G53 slow gear driving gear J4 fast and slow gear engaging sleeve B4 fast and slow gear shifting fork

G61 fast driven gear G62PTO driving gear G63 slow driven gear

S6 second countershaft S7PTO shaft G71PTO shaft driven gear

Detailed Description

The present invention will be described in detail with reference to the drawings, which are provided for illustrative and explanatory purposes only and should not be construed as limiting the scope of the present invention in any way. Furthermore, features from embodiments in this document and from different embodiments may be combined accordingly by a person skilled in the art from the description in this document.

The embodiment of the present invention is as follows, please refer to the schematic structural diagrams of the tractor and the power transmission device shown in fig. 1 to 9, specifically, as shown in fig. 1, the tractor includes an engine 1, a chassis 2, a frame 3, a cab 4 and a suspension device. The chassis includes a power transmission and a travel system. The frame 3 comprises a front frame 31, a hinge point 32 and a rear frame 33. The cab 4 includes a meter table 41, an operating mechanism 42, and a seat 43. The suspension arrangement comprises a front counterweight 51 and a suspension riser 52. As shown in fig. 2, the power transmission device includes a front axle a, a clutch B, a speed reducer C, a transmission D, and a universal transmission E. The running system comprises a suspension and wheels W, and the suspension can be omitted for the tractor mainly used for field operation. As shown in fig. 3, the reduction gear C includes a reduction case C1, a reduction case cover C2, an input shaft C3, an output shaft C4, and an output shaft driven gear C5. As shown in fig. 4, the transmission D includes a variator assembly D1, a front drive assembly D2, a final drive assembly D3, and a power take-off assembly D4.

An input shaft driving gear is arranged on an input shaft C3 of the speed reducer C, the input shaft is supported on a speed reducer box C1 through a bearing X2, two ends of the input shaft are positioned through an end cover X1, and the input shaft is fixed on the box through a bolt X3. An output shaft driven gear C5 is sleeved on an output shaft C4 through a spline, an output shaft driven gear C5 is positioned on an output shaft C5 through a retainer ring X5, an output shaft C5 is supported on a reduction box body C1 through a bearing X2, two ends of the output shaft C1 are positioned through an end cover X1, and the output shaft C3 is fixed on the box body through a bolt X3. A power input end of the input shaft C3 and a power output end cover X1 of the output shaft C4 are provided with a sealing ring X4. The input shaft driving gear is normally meshed with the output shaft driven gear C5, the rotating speed of the output shaft is reduced through the transmission of the secondary gear, and the shaking of a transmission system in the large-angle power transmission process is reduced.

The speed change assembly D comprises a reverse gear shaft S, a secondary input shaft S, a reverse gear intermediate gear G, a first gear driving gear G, a second gear driving gear G, a third gear driving gear G, a fourth gear driving gear G, a third gear driven gear G, a reverse gear driving gear G, a third gear driving gear G, a fourth gear driving gear G, a middle shaft S, a first gear driven gear G, a second gear spline hub G, a second gear driven gear G, a third and fourth gear spline hub G, a fourth gear driven gear G, a high-low gear spline hub G, a low-speed gear G, a second gear engaging sleeve J, a third and fourth gear engaging sleeve J, a high-low gear engaging sleeve J, a second gear shifting fork B, a third and fourth gear shifting fork B, a high-low gear shifting fork B and a universal piece X, the universal piece X comprises an end cover X, a bearing X, a bolt X, a sealing ring X, a retaining ring X, snap ring X10, spring X11, thrust bearing X12.

The front drive assembly D2 comprises a front drive shaft S3 and a front drive locking assembly L, wherein the front drive locking mechanism L comprises a locking clamp L1, a spring rear seat L2, a spring front seat L3, a motor support L4, a steel sheet L5, a friction sheet L6, a clutch hub L7 and a speed reduction motor L8. The final drive assembly D3 includes a final drive shaft S4, a final drive shaft driven gear G41, a final drive bevel gear G42 and a final drive D31.

The power take-off assembly D4 includes a PTO input shaft S5, a fast gear drive gear G51, a fast and slow gear splined hub G52, a slow gear drive gear G53, a fast and slow gear engaging sleeve J4, a fast and slow gear shift fork B4, a fast gear driven gear G61, a PTO drive gear G62, a slow gear driven gear G63, a second countershaft S6, a PTO shaft S7, and a PTO shaft driven gear G71.

The front end of the clutch B is installed on the engine A, the rear end of the clutch B is installed with the speed reducer C, the hinge point 32 is installed on the speed reducer C, the front frame 31 is installed on the engine 1, the front axle A and the counterweight 51 are installed on the front frame 31, and the front frame 31, the front axle A, the engine 1, the clutch B and the speed reducer C form a front machine body. The front body can be deflected about the hinge point 32, the rear frame 33 is mounted on the hinge point 32, the transmission D is mounted on the rear frame 33, the cab 4 is mounted on the transmission D, and the suspension risers 52 are mounted on the transmission D.

The front end of the clutch B is arranged on an engine A, the rear end of the clutch B is provided with a speed reducer C, a front drive assembly D2 of the speed changer transmits power to a front axle A through a universal transmission device E, and in order to improve the power transmission efficiency, if a suspension is not arranged on the front axle A, the input end of the front axle A is coaxial with the output end of a front drive assembly D2. If the front axle is provided with a suspension, the input of the front axle a is coaxial with the output of the front drive assembly D2 allowing only a small amount of roll. The front drive component D2 is in a normally disconnected state, the tractor is driven by a rear wheel when running normally, and the front drive is switched in only when the rear drive slips, so that four-wheel drive of the tractor is realized.

The hinge point 32 is installed on the speed reducer C, the rear frame 33 is installed on the hinge point 32, the speed changer D is installed on the rear frame 33, and the auxiliary input shaft S1 of the speed changer D is connected with the output shaft C4 of the speed reducer C through the universal transmission device E. The universal transmission device E between the speed changer D and the speed reducer C is a duplex constant-speed universal joint, and the joint of the duplex constant-speed universal joint is on the axis extension line of the frame hinge point 32.

The reverse gear intermediate gear G0 is sleeved on a reverse gear shaft S0 through a shaft sleeve X8, the reverse gear intermediate gear G0 can freely rotate around the reverse gear shaft S0, the reverse gear shaft S0 is fixed on a box C71 through threaded connection, and the position of the reverse gear intermediate gear G0 is controlled by a reverse gear shaft shifting fork B4.

The first-gear driving gear G11, the second-gear driving gear G12, the third-gear driving gear G13, and the fourth-gear driving gear G14 are spline-fitted on the sub input shaft S1. The triple gear driving gear G17, the reverse gear driving gear G16 and the triple gear driven gear G15 are integrated and are sleeved on the auxiliary input shaft S1 through a bearing X2 in an empty mode. The sub input shaft S1 is supported by the casing via a bearing X2. A retainer ring F6 is arranged between the fourth-gear driving gear G14 and the third-gear driving gear G13, a retainer ring X5 is arranged between the second-gear driving gear G12 and the first-gear driving gear G11, a retainer ring X5 is arranged between the first-gear driving gear G11 and the bearing X2, and a retainer ring X5 is arranged between the third-gear driving gear G17 and the bearing X2.

The low-speed gear G29 and the high-low reverse spline hub G28 are freely sleeved on the intermediate shaft S2 through a bearing X2, the first-gear driven gear G21, the second-gear driven gear G23, the third-gear driven gear G24 and the fourth-gear driven gear G26 are freely sleeved on the intermediate shaft S2 through a shaft sleeve X8. The first-gear driven gear G21 and the bearing X2, the third-gear driven gear G24 and the second-gear driven gear G23, the fourth-gear driven gear G26 and the high-gear G27, and the low-gear G29 and the bearing X2 are positioned through a thrust shaft sleeve X7, so that the groups of components can rotate relatively at different rotating speeds. The high-speed gear G27, the three-four speed spline hub G25 and the two-speed spline hub G22 are sleeved on the intermediate shaft S2 through splines. The high-low engaging sleeve J3 is splined on the high-low reverse spline hub G28 and can slide back and forth along the high-low reverse spline hub G28. The third-fourth gear engaging sleeve J2 is splined on the third-fourth gear splined hub G25 and can slide back and forth along the third-fourth gear splined hub G25. A second-gear engaging sleeve J1 is splined to a second-gear splined hub G22 and can slide back and forth along second-gear splined hub G22. The low-speed gear G29, the high-low reverse spline hub G28, the high-low engaging sleeve J3 and the high-speed gear G27 form a high-low gear switching module. The second-gear driven gear G23, the second-gear engaging sleeve J1, the second-gear spline hub G22 and the first-gear driven gear G21 form a second-gear switching module. The four-gear driven gear G26, the three-four-gear engaging sleeve J2, the three-four-gear spline hub G25 and the three-four-gear driven gear G24 form a three-four-gear switching module.

The working principle is as follows:

the first gear and the second gear shift principle: a second gear sleeve J1 is in the neutral position, achieving a neutral gear between the first and second gears. The first-gear shifting fork B1 is operated to enable the first-gear engaging sleeve J1 to move forwards, so that an internal spline of the first-gear engaging sleeve J1 is combined with an external spline of the first-gear driven gear G21, power is transmitted to the first-gear driven gear G21 through the first-gear driving gear G11, is transmitted to the first-gear engaging sleeve J1 through an external spline of the first-gear driven gear G21, and is transmitted to the first-gear splined hub G22, so that the power is transmitted to the intermediate shaft S2, and the intermediate shaft S2 rotates in the first gear. The first-gear shifting fork B1 is operated to enable the first-gear engaging sleeve J1 to move backwards, so that an inner spline of the first-gear engaging sleeve J1 is combined with an outer spline of the second-gear driven gear G23, power is transmitted to the second-gear driven gear G23 through the second-gear driving gear G12, is transmitted to the first-gear engaging sleeve J1 through an outer spline of the second-gear driven gear G23, and is transmitted to the first-gear spline hub G22, so that the power is transmitted to the intermediate shaft S2, and the intermediate shaft S2 rotates in two gears.

Three-four gear shifting principle: the third-fourth clutch J2 is in the neutral position, achieving neutral between third and fourth gears. The third-fourth gear shifting fork B2 is operated to move the third-fourth gear engaging sleeve J2 forward, so that the internal spline of the third-fourth gear engaging sleeve J2 is combined with the external spline of the third-fourth gear driven gear B39, power is transmitted to the third-fourth gear driven gear G24 from the third-gear driving gear G13, is transmitted to the third-fourth gear engaging sleeve J2 through the external spline of the third-fourth gear driven gear G24, is transmitted to the third-fourth gear spline hub G25, and is transmitted to the intermediate shaft S2, and the intermediate shaft S2 rotates in the third gear. The third-fourth gear shift fork B2 is operated to move the third-fourth gear engaging sleeve J2 backward, so that the internal spline of the third-fourth gear engaging sleeve J2 is engaged with the external spline of the fourth-gear driven gear G26, power is transmitted from the fourth-gear driving gear G14 to the fourth-gear driven gear G26, is transmitted to the third-fourth gear engaging sleeve J2 through the external spline of the fourth-gear driven gear G26, and is transmitted to the third-fourth gear spline hub G25, so that the power is transmitted to the intermediate shaft S2, and the intermediate shaft S2 rotates in four gears.

In the reverse shift principle, as shown in fig. 7, the reverse intermediate gear G0 is normally engaged with the high-low reverse engagement sleeve J3, and in the reverse neutral position, the reverse intermediate gear G0 (as shown in the G0(1) position in fig. 7) cannot be engaged with the reverse drive gear G16, and neutral is output. When the reverse shift fork B4 drives the reverse intermediate gear G0 to slide forward, the reverse intermediate gear G0 is simultaneously engaged with the reverse driving gear G16 and the high-low reverse engaging sleeve J3 to output reverse, and the position of the reverse intermediate gear G0 is shown as G0(2) in FIG. 7.

High-low gear shifting principle. The high-low range engaging sleeve J3 is in a neutral position, achieving neutral between high and low ranges. The nature of the combination of the internal splines of the high-low stage engaging sleeve J3 with the external splines of the high-speed stage gear G27 is such that the high-low reverse spline hub G28 is combined with the countershaft S2, since the high-speed stage gear G27 is splined on the countershaft S2 by operating the high-low stage shift fork B3 to move the high-low stage engaging sleeve J3 forward. The high-low range engaging sleeve J3 outputs high gear. The high-low gear shifting fork B3 is operated to enable the high-low gear joint sleeve J3 to move backwards, the internal spline of the high-low gear joint sleeve J3 is combined with the external spline of the low-speed gear G29, the high-speed gear G27 is in constant meshing with the triple gear driving gear G17, the triple gear driving gear G17 is integrated with the triple gear driven gear G15, and the triple gear driven gear G15 is in constant meshing with the low-speed gear B31. The transmission route is as follows: high gear G27, to a triple gear driven gear G15, to a triple gear drive gear G17, to a low gear G29, a high and low gear engaging sleeve J3. At this time, the high-low clutch J3 outputs in a low gear.

The rear drive shaft driven gear G41 is sleeved on the rear drive shaft S4 through a spline, the rear drive shaft driven gear G41 is in constant mesh with external teeth on the high-low gear joint sleeve J3, the rear drive shaft driven gear G41 is a wide gear, and the high-low gear joint sleeve J3 is in constant mesh transmission with the rear drive shaft driven gear G41 in neutral gear, high gear and low gear. A rear drive bevel gear G42 is machined on the rear drive shaft S4, and the rear drive bevel gear G42 transmits power to a driven bevel gear of the final drive D31. The rear drive shaft S4 is fixed on the box body through a bearing X2

The front drive shaft S3 is supported on the box body and the rear drive shaft S4 through a bearing X2 and a shaft sleeve X8, and a front drive locking device L is arranged on the front drive shaft. The locking clamp L1 is provided with a nut and is installed on an output shaft of a speed reduction motor L8, a screw is arranged on the output shaft of the locking clamp L1, a nut and screw moving pair is formed by the nut and the nut on the locking clamp L1, a thrust bearing X8 is installed between the locking clamp L1 and a spring rear seat D43, a spring X9 is installed between the spring rear seat L2 and a spring front seat L3, and a spring rear seat D43 is installed on the outer side of a steel sheet L5. The steel sheet L5 is provided with an external spline and is installed on the clutch hub L7 through the external spline, and the steel sheet L5 can move back and forth on the clutch hub L7 and can not rotate relatively. The friction plate L6 is provided with an internal spline and is mounted on the secondary input shaft D21 through the internal spline, and can move back and forth along the spline on the secondary input shaft D21, and cannot rotate relatively. The friction plate L6 is arranged at a distance from the steel plate L5, and the clutch hub L7 is spline-mounted on the rear drive shaft S4. The on-off of the speed reducing motor L8 is controlled by a driver, the driver controls the speed reducing motor L8 to be electrified and the front drive to be locked, the vehicle enters a four-wheel drive mode, the driver controls the speed reducing motor to be powered off, the front drive port is connected, and the vehicle enters a two-wheel drive mode of rear wheel drive.

The four-wheel drive locking principle is as follows:

the lock-up tong L1 is moved under the control of the reduction motor L8, the lock-up tong L1 moves to make the thrust bearing X8 compress the spring X9, the spring presses the steel sheet L5 and the friction sheet L6, and the power transmitted from the auxiliary input shaft D21 is input to the rear drive shaft S4.

The rear drive shaft S4 is mounted on the auxiliary box body D11 through a bearing X7, a driving bevel gear is arranged on the rear drive shaft S4, and the rear main speed reducer D52 is driven through a driven bevel gear.

The rear-drive locking assembly D4 comprises a locking clamp L1, a spring rear seat L2, a spring front seat L3, a motor support L4, a steel sheet L5, a friction sheet L6, a clutch hub L7, a speed reduction motor L8, and a rear-drive assembly D5 mainly composed of a rear-drive shaft S4 and a rear main reducer D52.

PTO shift principle:

PTO fast gear: the fast and slow gear engaging sleeve J4 moves forward, the fast and slow gear engaging sleeve J4 is simultaneously combined with the fast and slow gear spline hub G52 and the external spline of the fast gear driving gear G51, and the PTO transmission is shifted to a fast gear. The power transmission route is as follows. PTO input shaft S5, to fast and slow gear spline hub G52, fast and slow gear engaging sleeve J4, fast gear driving gear G51, fast gear driven gear G61, second countershaft S6, PTO driving gear G62, PTO driven gear E10, PTO shaft S7.

PTO slow gear: the fast and slow gear engaging sleeve J4 moves backwards, the fast and slow gear engaging sleeve J4 is simultaneously combined with the fast and slow gear spline hub G52 and the external spline of the slow gear driving gear G53, and the PTO transmission is shifted to a slow gear. The power transmission route is as follows. PTO input shaft S5, to fast and slow gear spline hub G52, fast and slow gear engaging sleeve J4, slow gear driving gear G53, slow gear driven gear G63, second countershaft S6, PTO driving gear G62, PTO driven gear E10, PTO shaft S7.

The tractor and the power transmission device thereof with the structure have the advantages that:

first, on derailleur rearmounted installation and pin joint, the length of derailleur can not influence whole car length, is favorable to reducing the whole car length of tractor, improves the mobility.

The second, through set up the reduction gear at the pin joint front end and slow down, can effectively reduce the rotational speed of universal transmission device in transmission process, reduce universal transmission device shake, improve the life of universal transmission device and whole car.

And thirdly, the tractor adopts rear drive as a main part and four-wheel drive as an auxiliary part, so that the driving capability is stronger.

Fourthly, the four-wheel drive control is more convenient and faster by adopting the electric control multi-piece friction piece type four-wheel drive locking device, and the four-wheel drive can be controlled in the advancing process of the tractor.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims (10)

1. A power transmission device is characterized by comprising a front frame, a hinge point, a rear frame, a clutch, a speed reducer, a speed changer, a universal transmission device, a front axle and a locking device;

the hinged point is arranged between the front frame and the rear frame, and the transmission is arranged on the hinged point;

the speed reducer is arranged between the clutch and the transmission, and the universal transmission device is arranged between the front axle and the transmission;

the locking device comprises a front-drive locking assembly, and the front-drive locking assembly is arranged in the transmission;

the speed changer comprises a speed change component, a front drive component, a main speed reduction component and a power output component, wherein the front drive component is arranged at one end of the speed change component, the main speed reduction component and the power output component are arranged at the other side of the speed change component, power is input into the speed change component, and is output to the front drive component, the main speed reduction component and the power output component respectively after the speed change of the speed change component.

2. The power transmission device according to claim 1, wherein the speed reducer includes a speed reduction case, and an input shaft and an output shaft that are provided in the speed reduction case, the output shaft being provided in parallel with the input shaft, the input shaft being connected to the clutch, the output shaft being connected to the transmission;

the input shaft is provided with an input shaft driving gear, the output shaft is provided with an output shaft driven gear meshed with the input shaft driving gear, when the input shaft rotates, the input shaft driving gear is driven to rotate, the output shaft driven gear rotates to drive the output shaft to rotate, and the transmission is provided with input power.

3. The power transmission device according to claim 2, wherein the speed change assembly includes a reverse gear shaft, and a counter input shaft and an intermediate shaft arranged in parallel with the reverse gear shaft, and a reverse gear intermediate gear is provided on the reverse gear shaft;

the auxiliary input shaft is sequentially provided with a first-gear driving gear, a second-gear driving gear, a third-gear driving gear, a fourth-gear driving gear, a triple gear driven gear, a reverse gear driving gear and a triple gear driving gear;

set gradually one on the jackshaft and keep off driven gear, two keep off spline hub, two keep off driven gear, three keep off spline hub, four keep off driven gear, high-speed gear, high-low reverse gear spline hub, low-speed gear, two keep off clutch sleeve, three keep off clutch sleeve, high-low gear clutch sleeve, two keep off shift fork, three keep off shift fork, high-low gear shift fork and general spare.

4. The power transmission device according to claim 3, wherein the first-gear driving gear, the second-gear driving gear, the third-gear driving gear, and the fourth-gear driving gear are spline-fitted on the sub input shaft;

the triple gear driven gear, the reverse gear driving gear and the triple gear driving gear are sleeved on the auxiliary input shaft in a hollow way through a bearing;

and a check ring is arranged between the four-gear driving gear and the three-gear driving gear, a check ring is arranged between the two-gear driving gear and the one-gear driving gear, the one-gear driving gear and the bearing are arranged, and a check ring is also arranged between the three-gear driving gear and the bearing.

5. The power transmission of claim 4, wherein the forward-drive assembly includes a forward-drive shaft, the forward-drive locking assembly being disposed on the forward-drive shaft;

the front drive stopping assembly comprises locking pliers, a spring rear seat, a spring front seat, a motor support, a steel sheet, a friction sheet, a clutch hub and a speed reducing motor which are sequentially arranged on the front drive shaft.

6. The power transmission device according to claim 5, wherein the locking tong is movably disposed on the output shaft of the reduction motor, a thrust bearing is disposed between the locking tong and a rear spring seat, a spring is disposed between the rear spring seat and a front spring seat, the rear spring seat is disposed outside the steel plate, and the steel plate is disposed on the clutch hub through an external spline and is movable on the clutch hub;

the friction plate is arranged on the auxiliary input shaft through an internal spline and can move on the auxiliary input shaft, and the clutch hub is arranged on the rear drive shaft through a spline.

7. The power transmission device according to claim 6, wherein the main speed reduction assembly comprises a rear drive shaft, the rear drive shaft is arranged at one end of the front drive shaft, a rear drive shaft driven gear and a rear drive bevel gear are sequentially arranged on the rear drive shaft, and a main speed reducer is arranged at one end of the rear drive shaft.

8. The power transmission device of claim 7, wherein the power take-off assembly includes a PTO input shaft, a second countershaft, and a PTO shaft, the PTO input shaft, the second countershaft, and the PTO shaft being disposed in parallel;

and a fast gear driving gear, a fast and slow gear spline hub, a slow gear driving gear, a fast and slow gear joint sleeve, a fast and slow gear shifting fork and a fast gear driven gear are sequentially arranged on the PTO input shaft.

9. The power transmission device according to claim 8, wherein a fast-gear driven gear, a PTO driving gear and a slow-gear driven gear are sequentially arranged on the second intermediate shaft, the fast-gear driven gear is used for being meshed with the fast-gear driving gear, and the slow-gear driven gear is used for being meshed with the slow-gear driving gear;

and a PTO shaft driven gear is arranged on the PTO shaft and is used for being meshed with the PTO driving gear.

10. A tractor comprising a power transmission, wherein the power transmission is as claimed in any one of claims 1 to 9.

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