CN217064620U - Time-sharing four-wheel drive transmission mechanism with bract impurity removal function - Google Patents

Abstract

The application provides take branch bract to arrange miscellaneous timesharing four-wheel drive mechanism includes: a power system, a walking system and an operating system; the traveling system comprises an underframe, a front driving bridge, a traveling gearbox, a rear driving transfer case, a side reduction case, a driving wheel, a front universal transmission shaft, a middle transmission shaft, a rear universal transmission shaft, a high-low transition gear box, a connecting chain wheel, a rear driving bridge and a guide wheel; the power system comprises an engine mechanism, a diesel tank and a front-end belt wheel, and the front-end belt wheel is in transmission connection with the traveling gearbox; the operating system comprises a shifting plate fixedly arranged on the middle transmission shaft, the rear-drive transfer case is used for the conversion of four-wheel drive and two-wheel drive, and the shifting plate rotates along with the transmission of the middle transmission shaft so as to be used for removing impurities from bracts.

Description

Time-sharing four-wheel drive transmission mechanism with bract impurity removal function

Technical Field

The application belongs to the technical field of agricultural machinery, and particularly relates to a time-sharing four-wheel drive transmission mechanism with bracts for impurity removal.

Background

The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.

At present, the traveling system of the self-propelled harvester in China mostly adopts a front wheel driving and rear wheel guiding mode. When the harvester runs and works on roads with poor road conditions, the harvester using the mode is limited in passing, and the harvesting efficiency of the corn is reduced. In order to meet the requirements of running of the harvester under different road environments, some enterprises install a four-wheel drive device on the harvester, but in order to solve the space problem of four-wheel drive intermediate transmission, the four-wheel drive intermediate transmission type harvester is selected to be provided with a returning crusher in a front-mounted or rear-mounted mode. The layout causes the power transmission of the whole machine to be very complicated, the stability of the structure of the whole machine is poor, and the crushing and returning effect of the stalks and the bracts to the field is poor. With the diversified development of agricultural planting modes in China, certain regions with loose geology also need to be popularized and applied to crop harvesting machinery, and a four-wheel drive type transmission mechanism capable of adapting to walking operation in the regions is needed. The corn harvester requires due to the working principle, the lower end of the vehicle chassis is positioned behind the walking gearbox and needs to be provided with the smashing device, the smashing device is used for smashing straws, and the mounting position of the smashing device is fixed, so that great difficulty is provided for transmitting power of the walking gearbox to a rear axle of the vehicle through shaft transmission.

Disclosure of Invention

In order to solve the problems, the application provides a time-sharing four-wheel drive transmission mechanism with bracts for impurity removal.

The application provides take branch bract to arrange miscellaneous timesharing four-wheel drive mechanism includes: a power system, a walking system and an operating system; the walking system comprises an underframe, a front driving bridge and a rear driving bridge are respectively arranged at the front end and the rear end of the underframe, side reduction boxes are arranged at the two ends of the front driving bridge, driving wheels are connected to the side reduction boxes, and guide wheels are arranged at the two ends of the rear driving bridge; a walking gearbox is fixedly arranged on the underframe, the front end of the walking gearbox is in transmission connection with the front drive bridge, the upper end of the walking gearbox is in transmission connection with a rear drive transfer case, the rear end of the rear drive transfer case is in transmission connection with a high-low transition gear box arranged on the lower side of the rear end of the underframe through a front universal transmission shaft, a middle transmission shaft and a rear universal transmission shaft which are mutually connected, and the upper end and the lower end of the high-low transition gear box are in transmission connection with the rear universal transmission shaft and the rear drive bridge respectively; the power system comprises an engine mechanism, a diesel tank and a front-end belt wheel, and the front-end belt wheel is in transmission connection with the traveling gearbox; the operating system comprises a shifting plate fixedly arranged on the middle transmission shaft, and the shifting plate rotates along with the transmission of the middle transmission shaft so as to be used for removing impurities from bracts.

Preferably, the engine mechanism comprises an engine and an air inlet and exhaust system, a heat dissipation system, a starter, a generator and a gear pump which are matched with the engine.

Preferably, the lower end of the high-low transition gear box transmits power with a rear drive bridge through a connecting chain wheel.

Preferably, the walking system further comprises a stepless speed change wheel and a stepless speed change driven wheel which are in transmission connection, and the front-end belt wheel is in transmission connection with the walking gearbox through the stepless speed change wheel and the stepless speed change driven wheel.

Preferably, the continuously variable transmission wheel and the continuously variable driven wheel are driven by a belt.

Preferably, the stepless speed change wheel includes initiative fixed disk, initiative driving disk, fixed seat axle and change speed cylinder, the initiative driving disk slides and sets up in the epaxial and output shaft with change speed cylinder of fixed seat, the initiative fixed disk sets firmly in the one end that the change speed cylinder was kept away from to the fixed seat axle, and the lateral wall combination of initiative fixed disk and initiative driving disk constitutes first V type race.

Preferably, infinitely variable follows driving wheel and includes driven price fixing, driven driving disk and pressure spring, driven price fixing and driven driving disk set up and swing joint relatively, and pressure spring's one end is connected in driven price fixing, and the other end is connected in driven driving disk, and driven price fixing and driven driving disk's lateral wall both make up and constitute second V type race, and infinitely variable speed wheel and infinitely variable speed follow driving belt between the driving wheel inlay locate in first V type race and the second V type race.

Preferably, the traveling system further comprises an operation box arranged in the cockpit, a speed change switch, an operation frame and a four-wheel drive clutch flexible shaft arranged on the underframe, wherein an operation hand lever and an operation handle are arranged on the operation box, the operation hand lever is in transmission connection with the rear drive transfer case through the four-wheel drive clutch flexible shaft, the operation handle is in transmission connection with the traveling gearbox through an operation frame combination, and the speed change switch is electrically connected with a speed change oil cylinder of the stepless speed change wheel.

Preferably, operating system includes ear of grain peeler, bract trash removal device, straw rubbing crusher, the rubbing crusher lift central siphon through hinged joint in proper order, lift cylinder liftable set up in the chassis middle part, rear universal drive shaft below is located to rubbing crusher lift central siphon and rear universal drive shaft and straw rubbing crusher lift process noninterference, and the bract gets into straw rubbing crusher under the effect of dialling the board.

Preferably, the underframe is made of channel steel.

Compared with the prior art, the beneficial effect of this application is:

this application has realized two nimble adjustments of driving and driving four through the back-drive transfer case, can adapt to the four-wheel drive operation demand under multiple complicated road conditions such as climbing or muddy or geology is loose, can also switch in real time two life who drives the extension tire. Meanwhile, the poking plate arranged on the middle transmission shaft realizes normal operation of impurity removing of the bracts under the two-wheel drive state and the four-wheel drive state, and the space problem of four-wheel drive middle transmission is solved through the front universal shaft, the rear universal shaft and the middle transmission shaft without influencing the impurity removing mechanism of the bracts. The application also improves the flexibility of walking speed change through the stepless speed change wheel and the stepless speed change driven wheel.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application.

Fig. 1 is a top view of the overall structure according to an embodiment of the present application.

Fig. 2 is a side view of the overall structure of an embodiment of the present application.

FIG. 3 is a side view of one embodiment of the present application.

FIG. 4 is a front view of one embodiment of the present application.

Fig. 5 is a schematic structural diagram of a chassis according to an embodiment of the present application.

Fig. 6 is a cross-sectional view of a continuously variable transmission wheel according to an embodiment of the present application.

Fig. 7 is a sectional view of a continuously variable transmission driven wheel structure according to an embodiment of the present application.

Fig. 8 is a side view of the whole device according to an embodiment of the present application.

In the figure:

1. an engine mechanism, 2, a diesel tank, 3, a front end belt wheel, 8, an underframe, 9, a front driving bridge, 10, a walking gearbox, 11, a stepless speed change driven wheel, 12, a rear driving transfer case, 13, a side reduction case, 14, a driving wheel, 15, a stepless speed change wheel, 16, a front universal transmission shaft, 17, an intermediate transmission shaft, 18, a rear universal transmission shaft, 19, a high-low transition gear case, 20, a coupling chain wheel, 21, a rear driving bridge, 22, a guide wheel, 23, a picking platform, 25, an ear peeler, 30, a bract impurity removing device, 31, a seed recovery case, 32, a straw crusher, 33, a cab, 34, a seat, 35, a steering gear, 36, a control case, 37, a control frame combination, 38, a four-wheel clutch flexible shaft, 41, a lifting oil cylinder, 100, a shifting plate, 111, a driven fixed plate, 112, a driven fixed plate, 113, a compression spring, a driving plate, 151, 152, a driving fixed plate, 152, Driving disc 153, fixed seat axle, 154, change speed oil cylinder, 322, crusher lifting axle tube, 361, control handle, 362 and control handle rod.

The specific implementation mode is as follows:

the present application will be further described with reference to the following drawings and examples.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present disclosure. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

In the present disclosure, terms such as "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "side", "bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only relational terms determined for convenience in describing structural relationships of the parts or elements of the present disclosure, and do not refer to any parts or elements of the present disclosure, and are not to be construed as limiting the present disclosure.

As shown in fig. 1 to 8, the present application provides a time-sharing four-wheel drive transmission mechanism with bracts for removing impurities, comprising: a power system, a walking system and an operation system.

The walking system comprises an underframe 8, a front driving bridge 9 and a rear driving bridge 21 are respectively arranged at the front end and the rear end of the underframe 8, a side reduction box 13 is arranged at each end of the front driving bridge 9, a driving wheel 14 is connected to each side reduction box 13, and a guide wheel 22 is arranged at each end of the rear driving bridge 21; the fixed walking gearbox 10 that is equipped with on the chassis 8, walking gearbox 10 front end is connected with the transmission of front drive bridge 9, and the transmission of walking gearbox 10 upper end is equipped with rear-guard transfer case 12, rear-guard transfer case 12 rear end is connected with the transmission of the tooth case 19 that passes through interconnect's preceding universal drive shaft 16, intermediate drive shaft 17, back universal drive shaft 18 and the height of locating chassis 8 rear end downside transition, height transition tooth case 19 upper end and lower extreme are connected with rear universal drive shaft 18, the transmission of rear drive bridge 21 respectively.

The power system comprises an engine mechanism 1, a diesel tank 2 and a front-end belt wheel 3, the traveling system further comprises a continuously variable transmission wheel 15 and a continuously variable transmission driven wheel 11 which are in transmission connection, and the front-end belt wheel 3 is in transmission connection with a traveling gearbox 10 through the continuously variable transmission wheel 15 and the continuously variable transmission driven wheel 11.

The operating system comprises a shifting plate 100 fixedly arranged on the middle transmission shaft 17, and the shifting plate 100 rotates along with the transmission of the middle transmission shaft 17 so as to be used for removing impurities from bracts.

The underframe 8 is a frame welded by steel materials such as channel steel. The front driving bridge 9 is connected to the front end of the underframe 8, the two ends of the front driving bridge 9 are connected with the side reduction boxes 13, and the side reduction boxes 13 are connected with the driving wheels 14. The front part of the walking gearbox 10 is connected with a front driving bridge 9, and the rear part is connected with the underframe 8 through a suspender. The rear-drive transfer case 12 is fixed at the upper end of the walking gearbox 10. Two ends of the walking gearbox 10 are connected with two end side reduction boxes 13 through spline shafts to transmit power. The rear drive transfer case 12 is connected to a front universal drive shaft 16. The middle transmission shaft 17 is fixed on the underframe, the front end is connected with the front universal transmission shaft 16, and the rear end is connected with the rear universal transmission shaft 18. The high-low transition gear box 19 is fixed at the lower side of the rear end of the underframe 8, the upper end of the high-low transition gear box 19 is connected with the rear universal transmission shaft 18, the lower end of the high-low transition gear box is in power transmission with the rear drive bridge 21 through a connecting chain wheel 20, and the guide wheels 22 are fixed at two ends of the rear drive bridge 21.

This application realizes the switching of four-wheel drive and two-wheel drive through the combination and the separation of rear-guard transfer case 12:

the first state: rear drive transfer case 12 coupling

The power output end of the rear drive transfer case 12 on the upper part of the walking gearbox 10 rotates to sequentially drive a front universal transmission shaft 16, an intermediate transmission shaft 17, a rear universal transmission shaft 18 (the lower side is a grinder lifting shaft tube 321, no interference exists during transmission, and no interference exists during the lifting process of a straw grinder 32), a height transition gear box 19, a connecting chain wheel 20 and a rear drive bridge 21, and finally, the rotation of a rear wheel, namely a guide wheel 22 is realized, and four-wheel drive is realized. This mode is applicable to under climbing or muddy road conditions, through the complicated road conditions of four wheel drive adaptation.

And a second state: rear drive transfer case 12 disconnect

The walking gearbox 10 and the rear-drive transfer case 12 have no power transmission and do not influence each other.

In this state, the walking gearbox 10 can only drive the side reduction box 13 and the driving wheel 14 to rotate.

In this state, the vehicle is in a two-wheel drive state.

In this state, the guide wheel 22 rotates along with the vehicle, thereby driving the rear drive bridge 21, the connecting chain wheel 20, the high-low transition gear box 19, the rear universal transmission shaft 18 and the middle transmission shaft 17 in sequence, wherein the middle transmission shaft 17 is fixed with the shifting plate 100, therefore, the shifting plate 100 can rotate in the four-wheel drive separation state and the combination state.

The traveling system further comprises an operation box 36 arranged in the cab 33, a speed change switch, an operation frame combination 37 arranged on the underframe 8 and a four-wheel-drive clutch flexible shaft 38, an operation hand lever 362 and an operation handle 361 are arranged on the operation box 36, the operation hand lever 362 is in transmission connection with the rear-drive transfer case 12 through the four-wheel-drive clutch flexible shaft 38, the operation handle 361 is in transmission connection with the traveling gearbox 10 through the operation frame combination 37, and the speed change switch is electrically connected with the speed change oil cylinder 154 of the stepless speed change wheel 15. The cab 33 is also provided with a seat 34, a steering gear 35 and other mechanisms, and the specific structure is the prior art, which is not described in detail in the present application.

The continuously variable transmission wheel 15 and the continuously variable driven wheel 11 are driven by a belt. As shown in fig. 6, the continuously variable transmission wheel 15 includes a driving fixed plate 151, a driving movable plate 152, a fixed base shaft 153, and a transmission cylinder 154, the driving movable plate 152 is slidably disposed on a sliding shaft of the fixed base shaft 153 and connected to an output shaft of the transmission cylinder 154, the driving fixed plate 151 is fixedly disposed at one end of the sliding shaft of the fixed base shaft 153, which is far away from the transmission cylinder 154, and a first V-shaped belt groove is formed by combining side walls of the driving fixed plate 151 and the driving movable plate 152.

As shown in fig. 7, infinitely variable speed is followed driving wheel 11 and is included driven price fixing 111, driven driving disk 112 and pressure spring 113, driven price fixing 111 and driven driving disk 112 set up and swing joint relatively, the guiding hole has been seted up on driven price fixing 111, be equipped with the guide post on the driven driving disk 112, the guide post slides and inserts and locate the guiding hole, pressure spring 113 is located in the guiding hole, one end is connected in the terminal lateral wall of guiding hole, and the other end is connected in the guide post, and driven price fixing 111 and driven driving disk 112's lateral wall both make up and constitute second V type belt groove, and infinitely variable speed wheel 15 and infinitely variable speed are inlayed in first V type belt groove and second V type belt groove from the driving wheel 11 within a definite time.

When the speed change switch is shifted to a high speed gear, the speed change oil cylinder 154 is ejected out to drive the driving movable disc 152 of the stepless speed change wheel 15 to slide towards the driving fixed disc 151, the first V-shaped belt groove is narrowed, the transmission belt is extruded by the driving movable disc 152 and the driving fixed disc 151 to expand outwards, the transmission diameter of the transmission belt at one end of the stepless speed change wheel 15 is increased, the transmission belt at one end of the stepless speed change driven wheel 11 overcomes the tension of the compression spring 113 under the action of the tension force, the driven movable disc 112 slides towards the direction of the principle driven fixed disc 111, the second V-shaped belt groove is widened, the transmission diameter of the transmission belt at one end of the stepless speed change driven wheel 11 is decreased, the transmission ratio of the stepless speed change wheel 15 and the stepless driven wheel is decreased, the rotating speed of the stepless speed change driven wheel 11 is increased, and the rotating speed of the input shaft of the walking speed change box 10 is increased; when the speed change switch is shifted to a low gear, the speed change oil cylinder 154 returns oil, the driving movable disc 152 of the stepless speed change wheel 15 is not pressed by the speed change oil cylinder 154, the driving movable disc 152 slides towards the direction far away from the driving fixed disc 151, the first V-shaped belt groove is narrowed and widened, the transmission belt is narrowed inwards, the transmission diameter of the transmission belt at one end of the stepless speed change wheel 15 is reduced, meanwhile, under the action that the tension of the transmission belt is loosened, the driven movable disc 112 cannot overcome the tension of the pressing spring 113 and slides towards the driven fixed disc 111, the second V-shaped belt groove is narrowed, the transmission diameter of the transmission belt at one end of the stepless speed change driven wheel 11 is increased, the transmission ratio of the stepless speed change wheel 15 and the stepless speed change driven wheel 11 is increased, the rotating speed of the stepless speed change driven wheel 11 is reduced, and the rotating speed of the walking speed change box 10 is reduced.

The operating system includes ear peeler 25, bract trash removal device 30, straw rubbing crusher 32, and ear peeler 25, bract trash removal device 30 set up in the suitable position of chassis 8 or automobile body in order to be used for skinning and trash removal transmission, straw rubbing crusher 32 sets up in chassis 8 middle part through the rubbing crusher lift central siphon 322 of hinged joint in proper order, lift cylinder 41 liftable, and lift cylinder 41 articulates on chassis 8, and the output shaft action of lift cylinder 41 drives rubbing crusher lift central siphon 322 action, and then drives straw rubbing crusher 32 and be elevating movement in chassis 8 below to in the time of the operation trash removal with straw rubbing crusher 32, will rise straw rubbing crusher 32 when changeing, prevent to hinder the vehicle and go. The operating system also comprises a snapping platform 23 arranged at the front end of the vehicle and a transmission mechanism matched with the snapping platform 23. The ear picking platform 23 separates the stalks from the ears, the transmission mechanism transmits the stalks to the stalk crusher 32, the ears are transmitted to the ear peeler 25, bracts and a small amount of grains peeled off in the peeling process of the ear peeler 25 pass through the bracts impurity removing device 30, the grains fall into a grain recycling box 31 arranged at the lower part, and the stalks separated from the bracts and the ear picking platform 23 enter the stalk crusher 32 through the shifting plate 100 to be crushed and returned to the field.

The implementation principle is as follows:

the four-drive and two-drive switching method comprises the following steps:

the four-wheel drive and two-wheel drive switching is realized through the combination and separation of the rear-wheel drive transfer case 12, and the specific steps are as follows:

an operator operates an operation hand lever 362 of the operation box 36, the rear-drive transfer case 12 is controlled to be combined with the walking gearbox 10 through the four-wheel drive clutch flexible shaft 38, the power output end of the rear-drive transfer case 12 rotates to sequentially drive the front universal transmission shaft 16, the middle transmission shaft 17, the rear universal transmission shaft 18, the high-low transition gear box 19, the connecting chain wheel 20 and the rear drive bridge 21, and finally the guide wheel 22 rotates to realize four-wheel drive.

An operator operates an operating hand lever 362 of the operating box 36, the rear-drive transfer case 12 is controlled to be separated from the walking transmission case 10 through the four-wheel-drive clutch flexible shaft 38, no power is output from the power output end of the rear-drive transfer case 12, the walking transmission case 10 only drives the side reduction case 13 and the driving wheels 14 to rotate, and the vehicle is in a two-wheel-drive state.

A walking speed change process:

the engine mechanism 1 works to drive the front end belt wheel 3 to rotate, power is transmitted to the input shaft of the walking gearbox 10, an operator operates the control handle 361 of the control box 36, and the walking gearbox 10 is controlled to be in gear walking through the control frame assembly 37.

Preferably, the walking speed-changing process further comprises a stepless speed-changing operation, and the walking speed-changing process comprises the following specific steps:

when the engine mechanism 1 works, the front belt wheel 3 rotates to sequentially drive the stepless speed change wheel 15, the stepless speed change driven wheel 11 and the input shaft of the walking gearbox 10 to rotate; an operator dials the speed change switch to a high-speed gear, the speed change oil cylinder 154 is ejected out to drive the driving movable disc 152 of the stepless speed change wheel 15 to slide towards the driving fixed disc 151, the first V-shaped belt groove is narrowed, the transmission belt is extruded by the driving movable disc 152 and the driving fixed disc 151 to expand outwards, the transmission diameter of the transmission belt at one end of the stepless speed change wheel 15 is increased, the tension of the compression spring 113 is overcome by the transmission belt at one end of the stepless speed change driven wheel 11 under the action of tension, the driven movable disc 112 slides towards the direction of the principle driven fixed disc 111, the second V-shaped belt groove is widened, the transmission diameter of the transmission belt at one end of the stepless speed change driven wheel 11 is decreased, the transmission ratio of the stepless speed change wheel 15 to the stepless driven wheel is decreased, the rotating speed of the stepless speed change driven wheel 11 is increased, and the rotating speed of the input shaft of the walking gearbox 10 is increased; an operator shifts the speed change switch to a low gear, the speed change oil cylinder 154 returns oil, the driving movable disc 152 of the stepless speed change wheel 15 is not pressed by the speed change oil cylinder 154, the driving movable disc 152 slides towards the direction far away from the driving fixed disc 151, the first V-shaped belt groove is narrowed and widened, the transmission belt is narrowed inwards, the transmission diameter of the transmission belt at one end of the stepless speed change wheel 15 is reduced, meanwhile, under the action that the tension of the transmission belt is loosened, the driven movable disc 112 cannot overcome the tension of the pressing spring 113 and slides towards the driven fixed disc 111, the second V-shaped belt groove is narrowed, the transmission diameter of the transmission belt at one end of the stepless speed change driven wheel 11 is enlarged, the transmission ratio of the stepless speed change wheel 15 and the stepless speed change driven wheel 11 is enlarged, the rotating speed of the stepless speed change driven wheel 11 is reduced, and the rotating speed of the walking gearbox 10 is reduced.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Although the embodiments of the present application have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present application, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive effort by those skilled in the art.

Claims (10)

1. Take branch bract to arrange miscellaneous timesharing four-wheel drive mechanism, its characterized in that includes: a power system, a walking system and an operating system;

the walking system comprises an underframe (8), a front driving bridge (9) and a rear driving bridge (21) are respectively arranged at the front end and the rear end of the underframe (8), side reduction boxes (13) are arranged at the two ends of the front driving bridge (9), driving wheels (14) are connected to the side reduction boxes (13), and guide wheels (22) are arranged at the two ends of the rear driving bridge (21); a walking gearbox (10) is fixedly arranged on the underframe (8), the front end of the walking gearbox (10) is in transmission connection with the front drive bridge (9), a rear drive transfer case (12) is arranged at the upper end of the walking gearbox (10), the rear end of the rear drive transfer case (12) is in transmission connection with a high-low transition gear box (19) arranged on the lower side of the rear end of the underframe (8) through a front universal transmission shaft (16), a middle transmission shaft (17) and a rear universal transmission shaft (18) which are mutually connected, and the upper end and the lower end of the high-low transition gear box (19) are in transmission connection with the rear universal transmission shaft (18) and the rear drive bridge (21) respectively;

the power system comprises an engine mechanism (1), a diesel tank (2) and a front-end belt wheel (3), wherein the front-end belt wheel (3) is in transmission connection with a walking gearbox (10); the operating system comprises a shifting plate (100) fixedly arranged on the middle transmission shaft (17), and the shifting plate (100) rotates along with the transmission of the middle transmission shaft (17) so as to be used for removing impurities from bracts.

2. The time-sharing four-wheel drive transmission mechanism with the bract for impurity removal according to claim 1, is characterized in that:

the engine mechanism (1) comprises an engine, and an air inlet and exhaust system, a heat dissipation system, a starter, a generator and a gear pump which are matched with the engine.

3. The time-sharing four-wheel drive transmission mechanism with the bract for impurity removal according to claim 1, is characterized in that:

the lower end of the high-low transition gear box (19) transmits power with a rear drive bridge (21) through a connecting chain wheel (20).

4. The time-sharing four-wheel drive transmission mechanism with the bract for impurity removal according to claim 1, is characterized in that:

the traveling system further comprises a stepless speed change wheel (15) and a stepless speed change driven wheel (11) which are in transmission connection, and the front-end belt wheel (3) is in transmission connection with the traveling gearbox (10) through the stepless speed change wheel (15) and the stepless speed change driven wheel (11).

5. The time-sharing four-wheel drive transmission mechanism with the bract for impurity removal according to claim 4, characterized in that:

the stepless speed change wheel (15) and the stepless speed change driven wheel (11) are in transmission through a belt.

6. The time-sharing four-wheel drive transmission mechanism with the bract for impurity removal according to claim 5, characterized in that:

stepless change wheel (15) are including initiative price fixing (151), initiative driving disk (152), fixed seat axle (153) and variable speed hydro-cylinder (154), initiative driving disk (152) slide set up on fixed seat axle (153) and with the output shaft of variable speed hydro-cylinder (154), initiative price fixing (151) set firmly in fixed seat axle (153) keep away from the one end of variable speed hydro-cylinder (154), and the lateral wall combination of initiative price fixing (151) and initiative driving disk (152) constitutes first V type race.

7. The time-sharing four-wheel drive transmission mechanism with the bract for impurity removal according to claim 6, characterized in that:

driven round (11) of infinitely variable speed includes driven price fixing (111), driven driving disk (112) and pressure spring (113), driven price fixing (111) and driven driving disk (112) set up and swing joint relatively, and the one end of pressure spring (113) is connected in driven price fixing (111), and the other end is connected in driven driving disk (112), and both make up and constitute second V type race groove from the lateral wall of driven price fixing (111) and driven driving disk (112), and drive belt between infinitely variable speed wheel (15) and infinitely variable speed driven round (11) inlays and locates in first V type race groove and the second V type race groove.

8. The time-sharing four-wheel drive transmission mechanism with the bract for impurity removal according to claim 7, is characterized in that:

the traveling system further comprises an operation box (36) arranged in the cab (33), a speed change switch, an operation frame combination (37) and a four-wheel-drive clutch flexible shaft (38) arranged on the chassis (8), an operation hand lever (362) and an operation handle (361) are arranged on the operation box (36), the operation hand lever (362) is in transmission connection with the rear-drive transfer box (12) through the four-wheel-drive clutch flexible shaft (38), the operation handle (361) is in transmission connection with the traveling gearbox (10) through the operation frame combination (37), and the speed change switch is electrically connected with a speed change oil cylinder (154) of the stepless speed change wheel (15).

9. The time-sharing four-wheel drive transmission mechanism with the bract for removing impurities, according to claim 1, is characterized in that:

the operating system includes ear of grain peeler (25), bract trash extraction device (30), straw rubbing crusher (32), but straw rubbing crusher (32) through rubbing crusher lift central siphon (322), lift cylinder (41) lifting of hinged joint in proper order set up in chassis (8) middle part, rear universal drive shaft (18) below and back universal drive shaft (18) and straw rubbing crusher (32) lift process noninterference are located in rubbing crusher lift central siphon (322), and the bract gets into straw rubbing crusher (32) under the effect of dialling board (100).

10. The time-sharing four-wheel drive transmission mechanism with the bract for impurity removal according to claim 1, is characterized in that:

the underframe (8) is made of channel steel.

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