CN221762594U - Wheel type machine four-wheel drive gearbox - Google Patents

Abstract

The utility model discloses a four-wheel drive gearbox of a wheel type machine, which comprises a gearbox shell, an input shaft, a main speed changing shaft, an output shaft and a speed changing shifting fork component, wherein a plurality of driving gears are fixedly connected on the input shaft, a plurality of driven gears which are rotationally meshed with the main speed changing shaft, a plurality of transition gears which are fixedly connected with the main speed changing shaft and a first transmission gear are arranged on the main speed changing shaft, the transition gear is movably connected with a connecting sleeve, the connecting sleeve is used for fixedly connecting the driven gear and the transition gear, the output shaft is fixedly connected with a second transmission gear which is used for being meshed with the first transmission gear, and the speed change shifting fork component is used for controlling the connecting sleeve to move; the input shaft, the main speed changing shaft and the output shaft are all installed in the speed changing shell through bearings, the main speed changing shaft is located between the input shaft and the output shaft, one end of the input shaft extends out of the shell and is connected with the power input device, one end of the main speed changing shaft extends out of the shell and is connected with the brake, and two ends of the output shaft extend out of the shell and are respectively connected with the front wheel axle and the rear wheel axle.

Description

Wheel type machine four-wheel drive gearbox

Technical Field

The utility model relates to a four-wheel drive gearbox of a wheel machine.

Background

A transmission, also known as a gearbox, is a mechanism for changing rotational speed and torque from an engine that can fix or shift the ratio of the output shaft to the input shaft. The speed variator consists of speed-changing driving mechanism and operating mechanism, and some automobiles also have power output mechanism. Most of the transmission mechanisms are driven by common gears, and other transmission mechanisms are driven by planetary gears. Common gear transmission speed change mechanisms generally use slipping gears, synchronizers and the like. The traditional agricultural wheel machine four-wheel drive gearbox has fewer gears and single running speed, and cannot meet the current working requirements.

Disclosure of utility model

The utility model aims to solve the defects in the prior art and provides a four-wheel-drive gearbox of a wheel machine.

A wheel type machine four-wheel drive gearbox, which comprises a gearbox shell, an input shaft, a main speed changing shaft, an output shaft and a speed changing shifting fork component, wherein a plurality of driving gears are fixedly connected on the input shaft, a plurality of driven gears which are rotationally meshed with the main speed changing shaft, a plurality of transition gears which are fixedly connected with the main speed changing shaft and a first transmission gear are arranged on the main speed changing shaft, the transition gear is movably connected with a connecting sleeve, the connecting sleeve is used for fixedly connecting the driven gear and the transition gear, the output shaft is fixedly connected with a second transmission gear which is used for being meshed with the first transmission gear, and the speed change shifting fork component is used for controlling the connecting sleeve to move;

The input shaft, the main speed changing shaft and the output shaft are all installed in the speed changing shell through bearings arranged on two sides of the whole gear part, the main speed changing shaft is positioned between the input shaft and the output shaft, one end of the input shaft extends out of the shell and is connected with the power input device, one end of the main speed changing shaft extends out of the shell and is connected with the brake, and two ends of the output shaft extend out of the shell and are respectively connected with the front wheel axle and the rear wheel axle.

In order to ensure the operation of the driving gear, a third-gear driving gear, a second-gear driving gear and a third-gear driving gear are sequentially arranged on the input shaft, wherein the second-gear driving gear, the third-gear driving gear and the input shaft are integrally formed, the third-gear driving gear is in driving connection with the input shaft through a spline structure, one side of the third-gear driving gear is attached to a retainer ring, the other side of the third-gear driving gear is attached to one side of a bearing, the retainer ring is embedded in a clamping groove of the input shaft, an oil seal is arranged on the other side of the bearing, one end of the input shaft is connected with one end of a connecting spline sleeve through the spline structure, and the other end of the connecting spline sleeve is connected with a power input shaft of the continuously variable transmission.

In order to ensure that the driven gear can rotate on the main speed changing shaft without hindrance, the main speed changing shaft is provided with a bearing, a third-gear driven gear, a first transition gear, a second-gear driven gear, a first transmission gear, a second transition gear, a first-gear driven gear spacer, a bearing and a brake which are sequentially arranged, the first-gear driven gear, the second-gear driven gear and the third-gear driven gear are respectively sleeved on the outer side of the needle bearing, the needle bearing is sleeved on the outer side of the bearing inner ring, and the bearing inner ring is sleeved on the outer side of the main speed changing shaft.

In order to prevent the shaking of parts on the main speed changing shaft, a thrust plate is arranged between the bearing inner ring where the first transmission gear and the second gear driven gear are positioned, and the thrust plate is abutted with the bearing inner ring, the needle bearing and the second gear driven gear and used for limiting the bearing inner ring, the needle bearing and the second gear driven gear.

In order to ensure the transmission effect of the first transmission gear, the first transmission gear is prevented from shaking during working, the first transmission gear is fixedly connected to the main speed changing shaft through a spline structure, check rings are arranged on two sides of the first transmission gear, and the check rings are embedded in clamping grooves on the main speed changing shaft.

In order to ensure the driven gear and the transition gear, the driven gear comprises a gear part and an external spline part, the gear part is used for being meshed with the driving gear, the external spline part is used for being connected with a connecting sleeve, the connecting sleeve is of a hollow structure, an inner spline structure is arranged on the inner wall of the connecting sleeve, and an external spline structure is arranged on the outer side wall of the transition gear.

In order to realize the movement of the connecting sleeve and connect different transition gears and driven gears, the outer side wall of the connecting sleeve is provided with a connecting groove, the speed-changing shifting fork component comprises a rocker arm assembly, shifting forks and shifting fork shafts, the shifting forks are provided with shifting fork feet with the same quantity as the transition gears, the shifting fork feet are connected in the connecting groove of the connecting sleeve, the shifting forks are movably sleeved on the shifting fork shafts, and a plurality of gear stopping points are arranged on the shifting fork shafts at intervals;

the rocker arm assembly comprises a rocker arm, a connecting column and a connecting rod, one end of the connecting column is connected with one end of the rocker arm, the other end of the connecting column is connected with one end of the connecting rod, the other end of the connecting rod is connected with a shifting fork shaft through a pin, and the connecting rod is parallel to the rocker arm.

In order to ensure that the output shaft can stably output power after, be equipped with preceding spline connecting seat, bearing, output gear, bearing, back spline connecting seat on the output shaft in proper order, one side that two bearings are close to the output shaft both ends respectively is equipped with the oil blanket, and preceding spline connecting seat and back spline connecting seat pass through nut and gasket and install respectively at the both ends of output shaft, and link to each other with front wheel axle and rear wheel axle respectively, and output gear passes through spline structure fixed connection on the output shaft.

The beneficial effects are that: compared with the prior art, the multi-gear speed change is realized through the main speed change shaft assembly and the speed change fork assembly, and the interlocking engagement of the driven gear and the transition gear with corresponding gears is realized through connection, so that the main speed change shaft rotates at the speed of the corresponding gears, all gears are limited in the axial direction and cannot move left and right, and the main speed change shaft assembly and the speed change fork assembly are always in a full engagement state, so that the phenomenon of damaged tooth surface engagement and gear disengagement is avoided, and the multi-gear speed change device is suitable for bumpy roads.

Drawings

FIG. 1 is an angular cross-sectional view of a transmission;

FIG. 2 is another angular cross-sectional view of the transmission;

FIG. 3 is a schematic illustration of an input shaft assembly;

FIG. 4 is a schematic illustration of an input shaft;

FIG. 5 is a schematic illustration of a main shift axle assembly;

FIG. 6 is a schematic illustration of a main shift axle;

FIG. 7 is a schematic illustration of an output shaft assembly;

FIG. 8 is a schematic diagram of an output shaft;

FIG. 9 is a schematic view of a shift fork assembly;

In the figure, 1, input shaft assembly, 2, main shift shaft assembly, 3, output shaft assembly, 4, shift fork assembly, 101, coupling spline housing, 102, input shaft, 103, oil seal one, 104, bearing one, 105, third gear drive gear, 106, retainer one, 107, bearing two, 1021, male spline one, 1022, bearing one, 1023, male spline two, 1024, clamping groove one, 1025, second gear drive gear, 1026, first gear drive gear, 1027, bearing two, 201, bearing three, 202, main shift shaft, 203, third gear driven gear, 204, needle bearing three, 205, bearing inner race three, 206, spline one, 207, spline transition wheel one, 208, second gear driven gear, 209, needle bearing two, 210, bearing inner race two, 211, thrust plate, 212, second, retainer 213, first drive gear, 214, retainer three, 215, spline two, 216, spline transition wheel two, 217, first gear driven gear 218, needle bearing one 219, bearing inner race one 220, spacer, 221, bearing four 222, brake, 20201, bearing gear three, 20202, optical axis three, 20203, external spline three, 20204, optical axis two, 20205, clamping groove two, 20206, external spline four, 20207, clamping groove three, 20208, external spline five, 20209, optical axis one, 20210, bearing gear four, 20211, external spline six, 301, rear spline coupling seat, 302, oil seal two, 303, bearing five, 304, output shaft 305, output gear, 306, retainer four, 307, bearing six, 308, oil seal three, 309, front spline coupling seat, 3010, lock nut, 3011, gasket, 3012, spring pin, 401, rocker arm assembly 4011, pin, 402, duplex fork 4021, fork notch, fork foot one, 3, fork foot two, 403, fork shaft, 4031, first and second spring ball 40232, 4033. third marble groove, 4034, fourth marble groove, 4035, fifth marble groove.

Detailed Description

The present utility model will be further described in detail with reference to the following examples and drawings for the purpose of enhancing the understanding of the present utility model, which examples are provided for the purpose of illustrating the present utility model only and are not to be construed as limiting the scope of the present utility model.

As shown, the input shaft assembly 1, the main shift shaft assembly 2, the output shaft assembly 3, the shift fork assembly 4, the coupling spline housing 101, the input shaft 102, the first oil seal 103, the first bearing 104, the third gear drive gear 105, the first retainer 106, the second bearing 107, the first outer spline 1021, the first bearing 1022, the second outer spline 1023, the first slot 1024, the second gear drive gear 1025, the first gear drive gear 1026, the second bearing 1027, the third bearing 201, the main shift shaft 202, the third gear driven gear 203, the needle bearing three 204, the bearing inner race three 205, the spline sliding sleeve 206, the spline sliding sleeve first 207, the second gear driven gear 208, the needle bearing two 209, the bearing inner race two 210, the thrust plate 211, the second retainer 212, the first transmission gear 213, the third retainer 214, the spline sliding sleeve two 215, the spline sliding sleeve two 216, the first gear driven gear 217, the needle bearing one 218, bearing inner race one 219, spacer 220, bearing four 221, brake 222, bearing gear three 20201, optical axis three 20202, external spline three 20203, optical axis two 20204, clip groove two 20205, external spline four 20206, clip groove three 20207, external spline five 20208, optical axis one 20209, bearing gear four 20210, external spline six 20211, rear spline coupling mount 301, oil seal two 302, bearing five 303, output shaft 304, output gear 305, retainer four 306, bearing six 307, oil seal three 308, front spline coupling mount 309, lock nut 3010, washer 3011, spring pin 3012, rocker arm assembly 401, pin 4011, duplex shift fork 402, shift fork notch 4021, shift fork foot one 4022, shift fork foot two 4023, shift fork 403, first marble groove 4031, second marble groove 4032, third marble groove 4033, fourth marble groove 4034, fifth marble groove 4035;

The four-wheel drive gearbox mainly comprises an input shaft assembly 1, a main speed change shaft assembly 2, an output shaft assembly 3, a speed change shifting fork assembly 4, a gearbox upper cover, a gearbox shell and the like.

The input shaft assembly 1 consists of a connecting spline housing 101, an input shaft 102, an oil seal I103, a bearing I104, a three-gear driving gear 105, a check ring I106 and a bearing II 107.

The input shaft 102 has a first 1021 external spline, a first 1022 bearing gear, a second 1023 external spline, a second 1025 drive gear, a first 1026 drive gear, and a second 1027 bearing gear. The external spline II 1023 is provided with a clamping groove.

Bearing one 104 and bearing two 107 are mounted at bearing one 1022 and bearing two 1027 of input shaft 102, respectively.

The center of the third gear driving gear 105 is of an inner spline hole structure, and the outer circle is of a gear structure. The three speed drive gear 105 has internal splines that mate with the external splines 1023 of the input shaft 102. The third-gear driving gear 105 is mounted on the second 1023 external spline of the input shaft 102 through an internal spline, and the retainer ring is mounted in the first 1024 of the clamping groove of the input shaft 102, so that the third-gear driving gear 105 is limited.

The center of the coupling spline housing 101 is an inner spline hole structure. The internal spline of the coupling spline housing 101 mates with the external spline 1021 of the input shaft 102.

The input shaft assembly 1 is mounted inside the gearbox housing by means of a first bearing 104 and a second bearing 107, and the first outer spline 1021 of the input shaft 102 extends outside the gearbox housing. The oil seal one 103 is mounted on the outer circle of the bearing block one 1022 of the input shaft 102. The excircle of the oil seal is attached to the inner wall of the oil seal hole, so that the sealing and leakage preventing effects are achieved. One end of the coupling spline housing 101 is mounted on the external spline one 1021 of the input shaft 102. (the other end of the coupling spline housing 101 is provided with an external spline of a power input shaft 102 of a continuously variable transmission, realizing power input.)

The main speed change shaft assembly 2 is composed of a bearing III 201, a main speed change shaft 202, a third-gear driven gear 203, a needle bearing III 204, a bearing inner ring III 205, a spline sliding sleeve I206, a spline transition wheel I207, a second-gear driven gear 208, a needle bearing II 209, a bearing inner ring II 210, a thrust plate 211, a retainer ring II 212, a first transmission gear 213, a retainer ring III 214, a spline sliding sleeve II 215, a spline transition wheel II 216, a first-gear driven gear 217, a needle bearing II 218, a bearing inner ring I219, a spacer 220, a bearing IV 221 and a brake 222.

The main speed changing shaft 202 is provided with a bearing gear III 20201, an optical axis III 20202, an external spline III 20203, an optical axis II 20204, an external spline IV 20206, an external spline V20208, an optical axis I20209, a bearing gear IV 20210 and an external spline V20211. The fourth 20206 external spline is provided with a second 20205 and a third 20207.

Bearing three 201 and bearing four 221 are mounted at bearing three 20201 and bearing four 20210, respectively, of the main shift shaft 202.

The inside of the bearing inner ring III 205 is of a smooth through hole structure, and the size of the through hole is equal to that of the excircle of the optical axis III 20202.

The third bearing inner race 205 is mounted on the outer circle of the third optical axis 20202 of the shift axle.

The needle roller bearing III 204 is arranged on the outer circle of the bearing inner ring III 205.

The third-gear driven gear 203 is of a step structure, the large outer circle is of a gear structure, the small outer circle is of an external spline structure, the center is of a smooth through hole structure, and the size of the through hole is equal to that of the outer circle of the needle bearing three 204. The third-gear driven gear 203 is arranged on the outer circle of the third needle bearing 204 and can flexibly idle.

The outer circle of the spline transition wheel I207 is of an external spline structure, and the center is of an internal spline hole structure. The external spline parameters of the spline transition wheel I207 are consistent with those of the small external circle of the third-gear driven gear 203. The internal spline of the spline transition wheel one 207 is matched with the external spline three 20203 of the main speed changing shaft 202. The spline transition wheel one 207 is mounted on the outer spline three 20203 of the main shift shaft 202.

The inside of the second bearing inner ring 210 is of a smooth through hole structure, and the size of the through hole is equal to that of the outer circle of the second optical axis 20204. The second bearing inner race 210 is mounted on the outer circle of the second optical axis 20204 of the main shift shaft 202. The left end of the second bearing inner ring 210 is attached to the end face of the first spline transition wheel 207, and the right end of the second bearing inner ring is provided with a thrust plate 211. The thrust plate 211 plays a limiting role on the second bearing inner ring 210, the second needle bearing 209 and the second-gear driven gear 208, and prevents axial movement.

The second needle bearing 209 is mounted on the outer circle of the second bearing inner ring 210.

The second-gear driven gear 208 has a step structure, the large outer circle has a gear structure, and the small outer circle has an external spline structure. The parameters of the external splines of the small outer circles of the second-gear driven gear 208 are consistent with those of the external splines of the small outer circles of the third-gear driven gear 203. The center of the second-gear driven gear 208 is of a smooth through hole structure, and the size of the through hole is equal to that of the excircle of the second needle bearing 209. The second-gear driven gear 208 is arranged on the excircle of the second needle bearing 209 and can flexibly idle. The length of the second bearing inner ring 210 is larger than the thickness of the second gear driven gear 208, so that a gap is reserved between the second gear driven gear 208 and the first spline transition wheel 207, and the phenomenon of dead abandoning can not occur in the process of mutual rotation.

The center of the first transmission gear 213 is an inner spline hole structure, and the outer circle is a gear structure. The first transfer gear 213 internal splines mate with the main shift shaft 202 external splines four 20206. The first transmission gear 213 is mounted on the fourth external spline 20206 of the main speed changing shaft 202 through an internal spline, and the second retainer ring 212 and the third retainer ring 214 are respectively mounted in the second clamping groove 20205 and the third clamping groove 20207 of the main speed changing shaft 202, so that a limiting effect is achieved on the first transmission gear 213.

The outer circle of the spline sliding sleeve I206 is provided with an annular groove structure, and the center is provided with an inner spline hole structure. The width of spline runner one 206 is less than the width of spline transition wheel one 207. The internal spline of the spline sliding sleeve I206 is matched with the external spline of the small outer circle of the third-gear driven gear 203, the external spline of the spline transition wheel I207 and the external spline of the small outer circle of the second-gear driven gear 208. The spline runner one 206 is mounted on the external spline of the spline transition wheel one 207. The spline sliding sleeve I206 can freely slide left and right along the small external spline of the third-gear driven gear 203, the external spline of the spline transition wheel I207 and the small external spline of the second-gear driven gear 208 under the action of the shifting fork foot I4022.

The outer circle of the spline transition wheel II 216 is of an external spline structure, and the center is of an internal spline hole structure. The internal spline of the spline transition wheel II 216 is matched with the external spline five 20208 of the main speed changing shaft 202. The second spline transition wheel 216 is mounted on the outer spline five 20208 of the main shift shaft 202.

The inside of the first bearing inner ring 219 is of a smooth through hole structure, and the size of the through hole is equal to that of the outer circle of the first optical axis 20209. The bearing inner race one 219 is mounted on the outer circle of the optical axis one 20209 of the main shift shaft 202. The left end of the bearing inner ring one 219 is jointed with the end face of the spline transition wheel two 216, and the right end is jointed with the spacer 220.

Needle bearing two 218 is mounted on the outer circle of bearing inner race one 219.

The first-gear driven gear 217 has a step structure, a large outer circle has a gear structure, and a small outer circle has an external spline structure. The small outer circle external spline parameters of the first-gear driven gear 217 are consistent with those of the second spline transition wheel 216. The center of the first-gear driven gear 217 is of a smooth through hole structure, and the size of the through hole is equal to that of the outer circle of the needle bearing II 218. The first-gear driven gear 217 is mounted on the outer circle of the needle bearing II 218 and can flexibly idle. The length of the first bearing inner ring 219 is larger than the thickness of the first driven gear 217, so that a gap is reserved between the first driven gear 217 and the second spline transition wheel 216, and no dead phenomenon occurs in the process of mutual rotation.

The outer circle of the spline sliding sleeve II 215 is provided with an annular groove structure, and the center is an inner spline hole structure. The width of the spline sliding sleeve II 215 is smaller than that of the spline transition wheel II 216. The internal spline of the spline sliding sleeve II 215 is matched with the external spline of the spline transition wheel II 216 and the small external spline of the first-gear driven gear 217. The second spline runner 215 is mounted on the external spline of the second spline transition wheel 216. The spline sliding sleeve II 215 can freely slide left and right along the external spline of the spline transition wheel II 216 and the small external spline of the first-gear driven gear 217 under the action of the shifting fork foot II 4023.

The spline sliding sleeve is a connecting sleeve;

The spacer 220 is mounted on the main shift shaft 202 between the first driven gear 217 and the fourth bearing 221 for transition and limiting.

The main gear shaft assembly 2 is mounted in the gearbox housing by means of a bearing III 201 and a bearing IV 221, the large outer circle gear part of the third-gear driven gear 203 is meshed with the outer circle gear part of the third-gear driving gear 105, the large outer circle gear part of the second-gear driven gear 208 is meshed with the second-gear driving gear 1025 on the input shaft 102, and the large outer circle gear part of the first-gear driven gear 217 is meshed with the first-gear driving gear 1026 on the input shaft 102. And the six 20211 parts of the external splines of the main gear shaft 202 extend out of the housing. The brake 222 is mounted on the external spline six 20211 of the main shift shaft 202 and is bolted to the transmission housing to brake the transmission system.

The output shaft assembly 3 is composed of a front spline coupling seat 309, an oil seal two 302, a bearing five 303, an output shaft 304, an output gear 305, a retainer four 306, a bearing six 307, an oil seal three 308, a rear spline coupling seat 301, a lock nut 3010, a gasket 3011 and a spring pin 3012.

The output shaft 304 is provided with an outer screw tooth, a pin hole, an outer spline seven, a bearing gear five, an outer spline eight, a bearing gear six and an outer spline nine. The external spline eight is provided with a clamping groove.

The center of the output gear 305 is an inner spline hole structure, and the outer circle is a gear structure. The internal splines of the output gear 305 mate with the external splines of the output shaft 304. The output gear 305 is mounted on the external spline eight of the output shaft 304 through the internal spline, and the fourth check ring 306 is mounted in the clamping groove of the output shaft 304, so that the output gear 305 is limited.

Bearing five 303 and bearing six 307 are mounted at bearing five and bearing six of output shaft 304, respectively.

The output shaft assembly 3 is mounted inside the gearbox housing by means of a bearing five 303 and a bearing six 307, and the external spline seven and the external spline nine of the output shaft 304 extend out of the gearbox housing. The second oil seal 302 and the third oil seal 308 are arranged on the outer sides of the fifth bearing 303 and the sixth bearing 307 in a half way, and the outer circle of the oil seal is attached to the inner wall of the oil seal hole to play a role in sealing and leakage prevention.

The front spline coupling seat 309 and the rear spline coupling seat 301 are respectively mounted on the external spline nine and the external spline seven of the output shaft 304, and are fixedly locked by a spring pin 3012, a spacer 3011, and a lock nut 3010. The front spline connecting seat 309 and the rear spline connecting seat 301 are connected with the front wheel axle and the rear wheel axle of the vehicle, and power is transmitted to the front wheel axle and the rear wheel axle, so that four-wheel drive running of the vehicle is realized.

The shift fork assembly 4 is comprised of a rocker arm assembly 401, a dual fork 402, and a fork shaft 403.

The fork shaft 403 has first, second, third, fourth, and fifth ball grooves 4031, 4032, 4033, 4034, and 4035. Both ends of the shift fork shaft 403 are fixedly installed in the gearbox housing, and the marble groove is a gear stopping point.

The duplex shifting fork 402 is mounted on the shifting fork shaft 403, and a first shifting fork leg 4022 of the duplex shifting fork 402 is clamped into an outer circular groove of the first spline sliding sleeve 206, and a second shifting fork leg 4023 of the duplex shifting fork 402 is clamped into an outer circular groove of the second spline sliding sleeve 215, namely the duplex shifting fork.

The rocker arm assembly 401 is mounted on the transmission upper cover and pins 4011 on the lower portion of the rocker arm assembly 401 snap into fork notches 4021 of the dual fork 402. Rotating rocker arm assembly 401 can cause duplex fork 402 to move left and right between the marble grooves on fork shaft 403, thereby driving spline sliding sleeve one 206 to slide freely left and right on the small external splines of third gear driven gear 203, spline transition wheel one 207 and second gear driven gear 208, and spline sliding sleeve two 215 to slide freely left and right on spline transition wheel two 216 and first gear driven gear 217.

The specific operation process comprises the following steps: the power is input by the coupling spline housing to drive the input shaft 102 to rotate, thereby simultaneously driving the third gear drive gear 105, the second gear drive gear 1025 and the first gear drive gear 1026 to rotate.

At this time, the brake 222 is in a released state;

The duplex shifting fork 402 is positioned on the first marble groove 4031 of the shifting fork shaft 403, so that the spline sliding sleeve I206 is positioned on the third-gear driven gear 203 and the spline transition wheel I207 at the same time to realize the interlocking of the three-gear driven gear 203 and the spline transition wheel I207, and the spline sliding sleeve II 215 is integrally positioned on the spline transition wheel II 216, thereby enabling the main speed changing shaft to rotate at the speed of three gears, and simultaneously enabling the first-gear driven gear and the second-gear driven gear to idle;

the first transmission gear 213 then rotates the output gear 305 engaged therewith at a third gear speed. The output gear 305 rotates the output shaft 304. The output shaft 304 drives the front spline connecting seat 309 and the rear spline connecting seat 301 at two ends to rotate, and transmits power to the front wheel and the rear wheel, so that the vehicle can travel at three-gear speed in four-wheel drive.

When the vehicle needs to shift gears, the rocker arm assembly 401 is shifted, the duplex shifting fork 402 is positioned on the second marble groove 4032 of the shifting fork shaft 403, so that the spline sliding sleeve I206 is integrally positioned on the spline transition wheel I207 and is not contacted with the third-gear driven gear 203 and the second-gear driven gear 208, and meanwhile, the spline sliding sleeve II 215 is integrally positioned on the spline transition wheel II 216 and is not contacted with the first-gear driven gear 217, and at the moment, the first-gear driven gear, the second-gear driven gear and the third-gear driven gear are all idle and cannot drive the main speed change shaft to rotate.

Therefore, the power is cut off at the main shift shaft assembly 2, no power is transmitted to the front and rear wheels, and the final vehicle can only operate at the neutral speed (stopped state).

When the rocker arm assembly 401 is shifted, the duplex shifting fork 402 is positioned on the third marble groove 4033 of the shifting fork shaft 403, so that the spline sliding sleeve I206 is positioned on the spline transition wheel I207 and the second-gear driven gear 208 at the same time, the spline sliding sleeve II 215 is integrally positioned on the spline transition wheel II 216 and is not contacted with the first-gear driven gear 217, and the second-gear drives the main speed change shaft to rotate, and the first-gear driven gear and the third-gear driven gear idle; the vehicle is driven to travel at a second gear speed.

When the rocker arm assembly 401 is shifted, the duplex shifting fork 402 is positioned on the fourth marble groove 4034 of the shifting fork shaft 403, so that the spline sliding sleeve I206 is integrally positioned on the second-gear driven gear 208 and is not contacted with the third-gear driven gear 203 and the spline transition wheel I207; the spline sliding sleeve II 215 is integrally positioned on the spline transition wheel II 216 and is not in contact with the first-gear driven gear 217, and at the moment, the first-gear driven gear, the second-gear driven gear and the third-gear driven gear are all idle and cannot drive the main speed changing shaft to rotate, so that the vehicle works at a neutral speed (stop state).

When the rocker arm assembly 401 is shifted, the duplex shifting fork 402 is positioned on the fifth marble groove 4035 of the shifting fork shaft 403, so that the spline sliding sleeve I206 is integrally positioned on the second-gear driven gear 208 and is not contacted with the third-gear driven gear 203 and the spline transition wheel I207; the spline sliding sleeve II 215 is simultaneously positioned on the spline transition wheel II 216 and the first-gear driven gear 217 to realize the interlocking of the spline transition wheel II and the first-gear driven gear 217, at the moment, the third-gear drives the main speed changing shaft to rotate, the first-gear and the second-gear idle, and the vehicle runs at the third-gear speed in a four-wheel drive mode.

When the agricultural machine vehicle needs to be braked, the brake 222 is locked, and the main transmission shaft 202 is in a locked state and cannot rotate. No matter in any gear, the power can not be continuously transmitted, and the subsequent parts are in a braking state, so that the braking of the agricultural machinery vehicle is realized.

The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the utility model.

Claims (8)

1. A four-wheel drive gearbox of a wheel type machine is characterized by comprising a gearbox shell, an input shaft, a main speed changing shaft, an output shaft and a speed changing shifting fork component, wherein a plurality of driving gears are fixedly connected to the input shaft, a plurality of driven gears which are rotationally meshed with the main speed changing shaft, a plurality of transition gears which are fixedly connected with the main speed changing shaft and a first transmission gear are arranged on the main speed changing shaft, the transition gear is movably connected with a connecting sleeve, the connecting sleeve is used for fixedly connecting a driven gear and the transition gear, the output shaft is fixedly connected with a second transmission gear which is used for being meshed with the first transmission gear, and the speed change shifting fork component is used for controlling the connecting sleeve to move;

The input shaft, the main speed changing shaft and the output shaft are all installed in the speed changing shell through bearings arranged on two sides of the whole gear part, the main speed changing shaft is located between the input shaft and the output shaft, one end of the input shaft extends out of the shell and is connected with the power input device, one end of the main speed changing shaft extends out of the shell and is connected with the brake, and two ends of the output shaft extend out of the shell and are respectively connected with the front wheel axle and the rear wheel axle.

2. The four-wheel-drive gearbox of the wheel type machine according to claim 1, wherein a three-gear driving gear, a two-gear driving gear and a three-gear driving gear are sequentially arranged on the input shaft, the two-gear driving gear, the three-gear driving gear and the input shaft are integrally formed, the three-gear driving gear is actively connected with the input shaft through a spline structure, one side of the three-gear driving gear is attached to a retainer ring, the other side of the three-gear driving gear is attached to one side of a bearing, the retainer ring is embedded in a clamping groove of the input shaft, an oil seal is arranged on the other side of the bearing, one end of the input shaft is connected with one end of a connecting spline sleeve through a spline structure, and the other end of the connecting spline sleeve is connected with a power input shaft of the continuously variable transmission.

3. The four-wheel-drive gearbox of the wheel machine according to claim 2, wherein the main speed changing shaft is provided with a bearing, a three-gear driven gear, a first transition gear, a second-gear driven gear, a first transmission gear, a second transition gear, a first-gear driven gear spacer, a bearing and a brake in sequence, the first-gear driven gear, the second-gear driven gear and the three-gear driven gear are respectively sleeved on the outer side of a needle bearing, the needle bearing is sleeved on the outer side of a bearing inner ring, and the bearing inner ring is sleeved on the outer side of the main speed changing shaft.

4. The four-wheel-drive gearbox for the wheel machine according to claim 3, wherein a thrust plate is arranged between the first transmission gear and the bearing inner ring where the second-gear driven gear is located, and the thrust plate is abutted with the bearing inner ring, the needle bearing and the second-gear driven gear and used for limiting the bearing inner ring, the needle bearing and the second-gear driven gear.

5. A four-wheel-drive gearbox for a wheel machine according to claim 3, wherein the first transmission gear is fixedly connected to the main speed-changing shaft through a spline structure, retaining rings are arranged on two sides of the first transmission gear, and the retaining rings are embedded in clamping grooves on the main speed-changing shaft.

6. The four-wheel-drive gearbox for the wheel machine according to claim 1, wherein the driven gear comprises a gear part and an external spline part, the gear part is used for being meshed with the driving gear, the external spline part is used for being connected with the connecting sleeve, the connecting sleeve is of a hollow structure, an internal spline structure is arranged on the inner wall of the connecting sleeve, and an external spline structure is arranged on the outer side of the transition gear.

7. The four-wheel-drive gearbox of the wheel machine according to claim 6, wherein the outer side wall of the connecting sleeve is provided with a connecting groove, the speed change shifting fork component comprises a rocker arm assembly, a shifting fork and a shifting fork shaft, the shifting fork is provided with shifting fork feet with the same number as the connecting sleeve, the shifting fork feet are connected in the connecting groove of the connecting sleeve, the shifting fork is movably sleeved on the shifting fork shaft, and a plurality of gear stopping points are arranged on the shifting fork shaft at intervals;

The rocker arm assembly comprises a rocker arm, a connecting column and a connecting rod, one end of the connecting column is connected with one end of the rocker arm, the other end of the connecting column is connected with one end of the connecting rod, the other end of the connecting rod is connected with a shifting fork shaft through a pin, and the connecting rod is parallel to the rocker arm.

8. The four-wheel-drive gearbox of the wheel type machine according to claim 1, wherein the output shaft is sequentially provided with a front spline connecting seat, a bearing, an output gear, a bearing and a rear spline connecting seat, oil seals are arranged on one sides, close to two ends of the output shaft, of the two bearings respectively, the front spline connecting seat and the rear spline connecting seat are respectively arranged at two ends of the output shaft through nuts and gaskets and are respectively connected with a front wheel axle and a rear wheel axle, and the output gear is fixedly connected to the output shaft through a spline structure.