CN210600091U

CN210600091U - Control system of electro-hydraulic control gearbox

Info

Publication number: CN210600091U
Application number: CN201921461344.7U
Authority: CN
Inventors: 李洪江; 王伟; 葛宏坤; 孙元帅; 林本珠; 周伟
Original assignee: Shandong Lovol Transmission Co ltd
Current assignee: Shandong Weichai Lovol transmission Co.,Ltd.
Priority date: 2019-09-04
Filing date: 2019-09-04
Publication date: 2020-05-22
Anticipated expiration: 2029-09-04

Abstract

The utility model discloses a control system of electricity hydraulic control gearbox, including hydraulic tank, first hydraulic cylinder, the second hydraulic cylinder, first piston assembly and second piston assembly, first hydraulic cylinder and second hydraulic cylinder set up relatively, first piston assembly slides and sets up in first hydraulic cylinder, the second piston assembly slides and sets up in the second hydraulic cylinder, the fork shaft both ends slide respectively set up with first hydraulic cylinder and second hydraulic cylinder in and respectively with first piston assembly and second piston assembly butt, first hydraulic cylinder and second hydraulic cylinder communicate with hydraulic tank respectively, first valve and second valve are respectively between first hydraulic cylinder and second hydraulic cylinder and hydraulic tank. The utility model provides a control system of electricity liquid control gearbox, control accuracy is high, shortens the time of shifting, reduces the power loss of the in-process of shifting.

Description

Control system of electro-hydraulic control gearbox

Technical Field

The utility model relates to a gearbox control technical field especially relates to control system of electro-hydraulic control gearbox.

Background

At present, a mechanical manual gear shifting mode is generally adopted in an agricultural harvesting machine gearbox in the prior art, namely a mode of a mechanical handle + a pull rod or a mode of a mechanical handle + a pull wire, the gear shifting mode has the problems of difficult adjustment, high labor intensity and the like, and particularly frequent gear shifting is needed in the original region because frequent turning and turning are needed, so that the labor intensity of a manipulator is increased; in the using process, the gear shifting mechanism needs to be frequently adjusted along with the abrasion of parts, and if the gear shifting mechanism is not adjusted in time, secondary faults such as the abrasion of a meshing sleeve and the abrasion of a gear shifting gear can be caused; the mechanical gear shifting mode usually needs the processes of gear selection and gear shifting after the clutch, so that the gear shifting time is increased, and the energy consumption and waste are caused.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a control system of electrohydraulic control gearbox, control accuracy is high, and the good reliability shortens the time of shifting, reduces the power loss of the in-process of shifting.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model discloses a control system of an electro-hydraulic control gearbox, which comprises a hydraulic oil tank, a first valve, a second valve, a first hydraulic oil cylinder, a second hydraulic oil cylinder, a first piston component and a second piston component, wherein the first hydraulic oil cylinder and the second hydraulic oil cylinder are oppositely arranged, the first piston component is arranged in the first hydraulic oil cylinder in a sliding way and divides the first hydraulic oil cylinder into a first oil cavity and a first fork shaft cavity, the second piston component is arranged in the second hydraulic oil cylinder in a sliding way and divides the second hydraulic oil cylinder into a second oil cavity and a second fork shaft cavity, two ends of a fork shaft are respectively arranged in the first fork shaft cavity and the second fork shaft cavity in a sliding way and are respectively abutted against the first piston component and the second piston component, the first oil cavity and the second oil cavity are respectively communicated with an oil outlet end of the hydraulic oil tank through pipelines, the first valve is arranged on a pipeline between the first oil cavity and the hydraulic oil tank, the second valve is arranged on a pipeline between the second oil cavity and the hydraulic oil tank, and the hydraulic oil tank supplies energy to the first oil cavity or the second oil cavity.

The utility model has the advantages that: when the gear is shifted towards the direction of the second hydraulic cylinder, the second valve is closed, the first valve is opened, hydraulic oil enters the first oil cavity, the first piston assembly is pushed to move towards the direction of the second hydraulic cylinder, the piston assembly pushes the fork shaft, the fork shaft drives the shifting fork, the shifting fork pushes the gear shifting transmission member, the gear shifting transmission member is meshed with the transmission teeth in the direction of the second hydraulic cylinder, and the gear shifting towards the direction of the second hydraulic cylinder is realized; if the gear is shifted to the first hydraulic oil cylinder direction, the first valve is closed, the second valve is opened, hydraulic oil enters the second oil cavity, the second piston assembly is pushed to move towards the first hydraulic oil cylinder direction, the gear shifting transmission part is meshed with the transmission teeth in the first hydraulic oil cylinder direction according to the same principle when the gear is shifted to the second hydraulic oil cylinder direction, the gear is shifted to the first hydraulic oil cylinder direction, the moving distance of the fork shaft is controlled through the hydraulic oil, the control precision is high, the reliability is good, the gear is directly shifted without the gear selecting process, the gear shifting time is shortened, and the power loss in the gear shifting process is reduced.

Further, still include hydraulic motor and third valve, hydraulic motor's output is connected with the input transmission of gearbox, hydraulic tank's the end that produces oil pass through the pipeline with hydraulic motor's oil feed end intercommunication, hydraulic motor's the end that produces oil pass through the pipeline with hydraulic tank intercommunication, the third valve set up in hydraulic motor's oil feed end with on the pipeline between hydraulic tank's the end that produces oil, hydraulic tank to the hydraulic motor energy supply, hydraulic motor be used for to gearbox input power.

The beneficial effect of adopting the further scheme is that: power is input to the gearbox through the hydraulic motor, when gear shifting is needed, the third valve is closed, the hydraulic motor stops inputting power to the gearbox, gear shifting is facilitated, a clutch is not needed, and control is convenient.

Furthermore, a first motor connecting port is formed in the middle of the first hydraulic oil cylinder, a second motor connecting port is formed in the middle of the second hydraulic oil cylinder, the first motor connecting port and the second motor connecting port are both communicated with an oil inlet end of the hydraulic motor, the first piston assembly is provided with a first piston oil duct, and the second piston assembly is provided with a second piston oil duct;

when the first piston assembly pushes the fork shaft to a first gear shifting position, the first oil cavity is communicated with the first motor connecting port through the first piston oil channel;

when the second piston assembly pushes the fork shaft to a second gear shifting position, the second oil cavity is communicated with the second motor connecting port through the second piston oil channel;

the hydraulic oil entering the hydraulic motor through the first motor connecting port and the second motor connecting port is used for driving the hydraulic motor.

The beneficial effect of adopting the further scheme is that: the hydraulic motor provides power, when shifting, hydraulic motor stops power input, before the completion of shifting, partial hydraulic oil flows into hydraulic motor through first motor connector or second motor connector, the input shaft that drives hydraulic motor and drive the gearbox rotates certain angle, the driving medium of shifting of being convenient for cuts smoothly, avoid at the driving medium of shifting at the removal in-process, the phenomenon of "tooth to tooth" appears in the driving tooth that the driving medium of shifting and needs cut, can't accomplish the meshing, the phenomenon of hanging not keeping off appears.

Further, the first piston assembly comprises a first piston and a first valve core, the first piston is arranged in the first hydraulic oil cylinder in a sliding mode and divides an inner cavity of the first hydraulic oil cylinder into a first oil cavity and a first fork shaft cavity, the first piston is provided with a first valve core mounting hole penetrating through two ends of the first piston in the moving direction, the first valve core is arranged in the first valve core mounting hole in a penetrating mode, the first piston is provided with a first piston assembly hole, the first valve core is provided with a first valve core groove, when the fork shaft is located at a first gear shifting position, the first piston assembly hole is communicated with the first motor connecting port, the first valve core groove is communicated with the first oil cavity, and the first valve core groove is communicated with the first piston assembly hole to form a first piston oil channel;

the second piston assembly comprises a second piston and a second valve core, the second piston is arranged in the second hydraulic cylinder in a sliding mode and divides an inner cavity of the second hydraulic cylinder into a second oil cavity and a second fork shaft cavity, the second piston is provided with a second valve core mounting hole penetrating through two ends of the second piston in the moving direction, the second valve core penetrates through the second valve core mounting hole, the second piston is provided with a second piston assembly hole, the second valve core is provided with a second valve core groove, when the fork shaft is located at a second gear shifting position, the second piston assembly hole is communicated with the second motor connecting port, the second valve core groove is communicated with the second oil cavity, and the second valve core groove is communicated with the second piston assembly hole to form a second piston oil channel.

The beneficial effect of adopting the further scheme is that: before the gear shifting transmission member reaches the gear shifting position, hydraulic oil cannot enter the hydraulic motor, the first piston oil duct and the second piston oil duct are blocked, leakage of the hydraulic oil in the first oil cavity and the second oil cavity is reduced, enough thrust is kept in the first oil cavity or the second oil cavity to push the fork shaft to move, and when the fork shaft reaches the gear shifting position, the first piston oil duct or the second piston oil duct is communicated with the hydraulic motor to enable the hydraulic oil to enter the hydraulic motor to drive the input shaft of the gearbox to rotate.

The valve further comprises a first guide positioning sleeve and a second guide positioning sleeve, the first guide positioning sleeve is fixed in the first fork shaft cavity, the second guide positioning sleeve is fixed in the second fork shaft cavity, the fork shafts are arranged in the first guide positioning sleeve and the second guide positioning sleeve in a sliding manner, the first valve core is arranged in the first valve core mounting hole in a sliding manner, and the second valve core is arranged in the second valve core mounting hole in a sliding manner;

when the fork shaft is located at a first gear shifting position, the end part of the first piston is abutted against the first guide positioning sleeve, the first valve core continuously pushes the fork shaft to move so that the gear shifting transmission part completes gear shifting, and the first valve core groove is disconnected with the first oil cavity;

when the fork shaft is located at a second gear shifting position, the end part of the second piston is abutted to the second guide positioning sleeve, the second valve core continuously pushes the fork shaft to move so that the gear shifting transmission member completes gear shifting, and the second valve core groove is disconnected with the second oil cavity.

The beneficial effect of adopting the further scheme is that: the first valve core slides in the first piston, when the first piston moves to abut against the first guide positioning sleeve, the first piston oil duct is communicated with the first oil cavity and the first motor connecting port, the first valve core continues to move to finish gear shifting, the first valve core groove is disconnected from the first oil cavity after the first valve core moves, and oil is not fed into the hydraulic motor any more; or the second valve core slides in the second piston, when the second piston moves to be abutted against the second guide positioning sleeve, the second piston oil duct is communicated with the second oil cavity and the second motor connecting port, the second valve core continues to move to finish gear shifting, the second valve core groove is disconnected from the second oil cavity after the second valve core moves, and oil is not fed into the hydraulic motor any more.

Furthermore, the first fork shaft cavity and the second fork shaft cavity are respectively provided with a first oil return hole and a second oil return hole, the first oil return hole and the second oil return hole are both communicated with the hydraulic oil tank, a first gap is formed between the first valve core and the first piston, a second gap is formed between the second valve core and the second piston, a third gap and a fourth gap are respectively formed between the fork shaft and the first guide positioning sleeve and the second guide positioning sleeve, the first guide positioning sleeve is provided with a first positioning sleeve oil return hole communicated with the first oil return hole, the second guide positioning sleeve is provided with a second positioning sleeve oil return hole communicated with the second oil return hole, the first gap is communicated with the first positioning sleeve oil return hole through the third gap, and the second gap is communicated with the second positioning sleeve oil return hole through the fourth gap.

The beneficial effect of adopting the further scheme is that: so that the residual hydraulic oil in the first clearance, the second clearance, the third clearance and the fourth clearance can return to the hydraulic oil tank.

Furthermore, steel wire check rings are sleeved at two ends of the first valve core and the second valve core and used for limiting the first valve core or the second valve core connected with the first valve core or the second valve core.

The beneficial effect of adopting the further scheme is that: the first valve core and the second valve core move in the first piston and the second piston respectively, when one end of the valve core moves to be flush with the end face of the first piston or the second piston, the steel wire retainer ring at the corresponding end can abut against the end face of the corresponding end of the first piston or the second piston, and the first valve core or the second valve core is prevented from being separated from the first piston or the second piston.

Further, still include the controller, first valve with the second valve is the solenoid valve, first valve with the second valve all with the controller electricity is connected and all received the controller control.

The beneficial effect of adopting the further scheme is that: the control of being convenient for, the control to hydraulic oil is more accurate.

Further, still include and keep off a position sensor, keep off a position sensor with the controller carries out data communication, keep off a position sensor and be used for confirming when shifting different fender position of shifting fork are accomplished.

The beneficial effect of adopting the further scheme is that: before the gear shifting is completed, hydraulic oil is kept to be supplied to the oil cavity, the shifting fork is pushed to move, after the gear sensor detects that the shifting fork reaches a preset position to complete the gear shifting, the gear sensor feeds back a signal to the controller, the controller controls the corresponding valve to be closed, the hydraulic oil is stopped to be supplied to the oil cavity, and the excessive gear shifting is avoided.

The utility model discloses a control system's of electricity liquid control gearbox control method: by adopting the control system of the electro-hydraulic control gearbox,

when the gear is shifted towards the direction of the second hydraulic cylinder, the first valve is opened, the second valve is closed, hydraulic oil in the hydraulic oil tank enters the first hydraulic cylinder to push the first piston assembly, and the first piston assembly pushes the fork shaft to move towards the direction of the second hydraulic cylinder, so that the gear is shifted towards the direction of the second hydraulic cylinder;

when the gear is shifted towards the direction of the first hydraulic oil cylinder, the second valve is opened, the first valve is closed, hydraulic oil in the hydraulic oil tank enters the second hydraulic oil cylinder to push the second piston assembly, and the second piston assembly pushes the fork shaft to move towards the direction of the first hydraulic oil cylinder, so that the gear is shifted towards the direction of the first hydraulic oil cylinder.

The utility model has the advantages that: the control accuracy is high, and the good reliability, no selection process directly shifts gears, shortens the time of shifting gears, reduces the power loss in the process of shifting gears.

Drawings

FIG. 1 is a schematic view of a hydraulic motor, a first hydraulic cylinder, a second hydraulic cylinder and a transmission;

fig. 2 is a schematic diagram of a hydraulic oil circuit according to an embodiment of the present invention;

FIG. 3 is a schematic view of the connection of the hydraulic motor, the first hydraulic cylinder, the second hydraulic cylinder and the housing;

FIG. 4 is a schematic view of a transmission;

FIG. 5 is a schematic diagram of a transmission case when in neutral;

FIG. 6 is a schematic diagram of the transmission when a first gear is engaged;

FIG. 7 is a diagram of a gearbox during two gear-hanging;

fig. 8 is a schematic view of a connection between a first hydraulic cylinder and a first piston assembly according to an embodiment of the present invention;

fig. 9 is a control signal transmission diagram of the present invention;

in the figure: 1-shell, 2-hydraulic motor, 21-coupling sleeve, 3-first shaft, 31-first gear driving gear, 32-second gear driving gear, 4-second shaft, 41-first gear driven gear, 42-gear hub, 43-second gear driven gear, 44-second shaft normally engaged gear, 45-shifting transmission piece, 46-engaging gear, 5-third shaft, 51-third shaft normally engaged gear, 52-third shaft final transmission gear, 6-differential, 61-input gear of differential, 62-first output shaft, 63-second output shaft, 71-first brake, 72-second brake, 73-third brake, 81-first hydraulic oil cylinder, 811-first oil inlet, 812-first motor, 813-first oil return hole connecting port, 814-first adjusting bolt, 815-first oil chamber, 816-first fork shaft chamber, 817-first adjusting threaded hole, 82-second hydraulic oil cylinder, 821-second oil inlet, 822-second motor connecting port, 823-second oil return hole, 824-second adjusting bolt, 825-second oil chamber, 826-second fork shaft chamber, 827-second adjusting threaded hole, 83-first piston assembly, 831-first valve core, 8311-first valve core groove, 832-first piston, 8321-first piston hole, 84-second piston assembly, 841-second valve core, 8411-second valve core groove, 842-second piston, 8421-second piston hole, 85-fork shaft, 86-pull fork, 87-locking ball, 881-first guide positioning sleeve, 8811-first positioning sleeve oil return hole, 882-second guiding positioning sleeve, 8821-second positioning sleeve oil return hole, 89-wire retainer ring.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings.

As shown in fig. 1-9, the present invention discloses a control system of an electro-hydraulic control transmission, comprising a hydraulic oil tank, a hydraulic motor 2, a first valve, a second valve, a third valve, a first hydraulic cylinder 81, a second hydraulic cylinder 82, a first piston assembly 83 and a second piston assembly 84, wherein the transmission is provided with a fork shaft 85, a pull fork 86 and a shift transmission member 45, the first hydraulic cylinder 81 and the second hydraulic cylinder 82 are oppositely disposed, the first piston assembly 83 is slidably disposed in the first hydraulic cylinder 81 and divides the first hydraulic cylinder 81 into a first oil chamber 815 and a first fork shaft chamber 816, the second piston assembly 84 is slidably disposed in the second hydraulic cylinder 82 and divides the second hydraulic cylinder 82 into a second oil chamber 825 and a second fork shaft chamber 826, two ends of the fork shaft 85 are slidably disposed in the first fork shaft chamber 816 and the second fork shaft chamber 826 respectively and abut against the first piston assembly 83 and the second piston assembly 84 respectively, the pull fork 86 is fixedly connected with the fork shaft 85, a first oil inlet 811 is formed in a first oil cavity 815, a second oil inlet 821 is formed in a second oil cavity 825, the first oil inlet 811 and the second oil inlet 821 are respectively communicated with an oil outlet end of a hydraulic oil tank through pipelines, a first valve is arranged on a pipeline between the first oil cavity 815 and the hydraulic oil tank, a second valve is arranged on a pipeline between the second oil cavity 825 and the hydraulic oil tank, an output end of the hydraulic motor 2 is in transmission connection with an input end of the gearbox, an oil outlet end of the hydraulic oil tank is communicated with an oil inlet end of the hydraulic motor 2 through a pipeline, an oil outlet end of the hydraulic motor 2 is communicated with the hydraulic oil tank through a pipeline, a third valve is arranged on a pipeline between the oil inlet end of the hydraulic motor 2 and the oil outlet end of the hydraulic oil tank, and the hydraulic motor 2.

The hydraulic oil tank is used for supplying power to the first oil chamber 815, the second oil chamber 825, and the hydraulic motor 2, and the hydraulic oil tank is preferably a hydraulic oil tank provided in the hydraulic motor 2.

The shift fork 86 is used for pushing the shift transmission member 45 to move so that the shift transmission member 45 is engaged with the transmission teeth of different gears to realize shifting, and the shift transmission member 45 can be selected from an engaging sleeve or a sliding gear.

Specifically, the transmission case further comprises a housing 1, a power input system, a power output system, a secondary shaft 4, a primary driven gear 41, a secondary driven gear 43, a gear hub 42, a shift transmission member 45 and a secondary normally engaged gear 44, wherein a first hydraulic cylinder 81 and a second hydraulic cylinder 82 are oppositely arranged at two sides of the housing 1, a fork shaft 85 is connected with the housing 1 in a sliding manner and is parallel to the secondary shaft 4, a shift fork 86 is arranged in the housing 1, one end of the shift fork 86 is fixedly connected with the fork shaft 85, the other end of the shift fork 86 is provided with a first limit groove and a second limit groove for the shift transmission member 45 to rotate, the first limit groove and the second limit groove are arranged in parallel, two ends of the shift transmission member 45 are respectively partially embedded into the first limit groove and the second limit groove, the shift transmission member 45 can rotate in the first limit groove and the second limit groove, the connection between the shift fork 86 and an engagement sleeve or a sliding gear is the prior art, the power input system is provided with a first shaft 3, a first gear driving gear 31 and a second gear driving gear, the power output system comprises a third shaft 5 and a third shaft normally-engaged gear 51, the first shaft 3 is a transmission box input shaft, the second shaft 4 is a transmission shaft, the third shaft 5 is a power output shaft, the first shaft 3, the second shaft 4 and the third shaft 5 are arranged in parallel in the shell 1, two ends of the first shaft 3, the second shaft 4 and the third shaft 5 are rotatably connected with the shell 1 through bearings, one end of the first shaft 3 is connected with the output end of the hydraulic motor 2 through a spline connecting sleeve 21 and transmits the power output by the hydraulic motor 2 into the transmission box, the first gear driving gear 31 and the second gear driving gear 32 are sequentially arranged on the first shaft 3 along the axial direction of the first shaft 3, the first gear driving gear 31 and the second gear driving gear 32 are coaxially and fixedly connected with, the first gear driving gear 31 and the second gear driving gear 32 can also be rigidly connected with the first shaft 3, preferably connected through splines, the second shaft 4 is sequentially provided with a first gear driven gear 41, a gear hub 42, a second gear driven gear 43 and a second shaft constant gear 44 along the axial direction thereof, the first gear driven gear 41, the gear hub 42 and the second gear driven gear 43 are respectively used as transmission teeth of a first gear, a neutral gear and a second gear, the first gear driven gear 41 and the second gear driven gear 43 are idle gears, the gear hub 42 is in spline transmission connection with the second shaft 4, the second shaft constant gear 44 is coaxially and fixedly connected, preferably rigidly connected, with the second shaft 4, the third shaft constant gear 51 is coaxially and fixedly connected, preferably rigidly connected, the first gear driven gear 41 is engaged with the first gear driving gear 31, the second gear driven gear 43 is engaged with the second gear driving gear 32, the second shaft constant gear 44 is engaged with the third shaft constant gear 51, the hydraulic shifting system is fixedly connected with the housing 1, the shifting transmission member 45 is meshed with the gear hub 42, and the end parts of the first-gear driven gear 41 and the second-gear driven gear 43 close to the gear hub 42 are provided with combining teeth 46 matched with the shifting transmission member 45.

The shift transmission member 45 is used to transmit the power of the first-gear driven gear 41 or the second-gear driven gear 43 to the hub 42, or to disconnect the first-gear driven gear 41 and the second-gear driven gear 43 from the hub 42.

The shift fork 86 is used for pushing the shift transmission member 45 to axially reciprocate along the secondary shaft 4, so that the shift transmission member 45 is only meshed with the gear hub 42, and the gear is neutral; or the shifting transmission member 45 is engaged with the coupling teeth 46 of the gear hub 42 and the first-gear driven gear 41 simultaneously, and the first gear is realized; alternatively, the shifting transmission member 45 meshes with both the hub gear 42 and the coupling teeth 46 of the second driven gear 43, which is now second gear.

The end of producing oil of hydraulic tank is provided with the hydraulic pump, and the end of producing oil of hydraulic tank and the inlet end intercommunication of hydraulic pump, the oil feed end of first oil pocket 815, second oil pocket 825 and hydraulic motor 2 all passes through the pipeline intercommunication with the end of producing oil of hydraulic pump, and first valve is on the pipeline between first oil pocket 815 and the hydraulic pump, and the second valve is on the pipeline of second oil pocket 825 and hydraulic pump, and the third valve is on the pipeline of the inlet end of hydraulic motor 2 and hydraulic pump.

When the hydraulic motor 2 outputs power, the first shaft 3 is driven to rotate, the first gear driving gear 31 and the second gear driving gear 32 on the first shaft 3 are driven to rotate by the first shaft 3, the first gear driving gear 31 and the second gear driving gear 32 respectively transmit the power to the first gear driven gear 41 and the second gear driven gear 43, when the first gear driven gear 41 and the second gear driven gear 43 are in a neutral gear state, the gear shifting transmission piece 45 is only meshed with the gear hub 42, because the first gear driven gear 41 and the second gear driven gear 43 are both free gears, when the gear shifting transmission piece 45 is not meshed with the first gear driven gear 41 or the second gear driven gear 43, no power is input into the second shaft 4, when gear shifting is needed, the third valve is closed, the first valve or the second valve is opened, hydraulic oil enters the first oil cavity 815 or the second oil cavity 825 to push the fork shaft 85 to move, the fork shaft 85 moves to drive the shifting fork 86 to move, the shifting fork 86 pushes the gear shifting, completing the first gear shifting, closing the first valve and the second valve after the first gear shifting is completed, opening the third valve, transmitting the power of the first gear driven gear 41 to the gear hub 42 through the shifting transmission member 45, connecting the gear hub 42 and the second shaft 4 through splines, driving the second shaft 4 to rotate by the gear hub 42, transmitting the power to the third shaft 5 through the second shaft normally-engaged gear 44 and the third shaft normally-engaged gear 51 and outputting the power according to the speed of the first gear; when the gear shifting transmission member 45 meshes with the two-gear driven gear 43 and the gear hub 42 simultaneously, the two-gear shifting is completed, the first valve and the second valve are closed after the gear shifting is completed, the third valve is opened, the power of the two-gear driven gear 43 is transmitted to the gear hub 42 through the gear shifting transmission member 45, the gear hub 42 drives the two shaft 4 to rotate, the power is transmitted to the three shaft 5 through the two shaft normally closed gear 44 and the three shaft normally closed gear 51 and is output according to the speed of the two gears, the operation is simple, the maintenance is convenient, the reliability is high, the direct gear shifting without the gear selecting process is realized, the gear shifting time is shortened, the power loss in the gear shifting process is reduced, the power performance is improved, the fuel

As the further scheme of this embodiment, still include the controller, first valve, second valve and third valve are the solenoid valve, first valve, second valve, third valve and hydraulic pump all are connected with the controller electricity and all are controlled by the controller, the controller has control panel, the last rocker switch that is provided with of control panel, the rocker switch is equipped with neutral gear, keep off and keep off two three fender position, send signal through the rocker switch and control the controller, the controller is optional to be used singlechip or PLC.

The rocker switch closes the first valve from neutral to first gear or from second gear to neutral or from second gear to first gear, opens the second valve, and hydraulic oil gets into second oil chamber 825, promotes to pull out fork 86 and drives shift transmission member 45 and move to first gear driven gear 41 direction, and the back is shifted to the completion, closes the second valve.

The rocker switch closes the second valve when going from neutral to two gears or from one gear to neutral or from one gear to two gears, opens the first valve, and hydraulic oil enters the first oil chamber 815, pushes the fork 86 to drive the transmission member to move towards the direction of the two-gear driven gear, and closes the first valve after finishing shifting.

As a further scheme of this embodiment, still include the position sensor, position sensor and controller carry out data communication, position sensor when being used for confirming that shift fork 86 accomplishes different fender position and shift gears, position sensor sets up in the gearbox, and it is prior art to set up the position sensor in the gearbox.

As a further aspect of the present embodiment, a first motor connection port 812 is formed in the middle of the first hydraulic cylinder 81, a second motor connection port 822 is formed in the middle of the second hydraulic cylinder 82, both the first motor connection port 812 and the second motor connection port 822 are communicated with the oil inlet end of the hydraulic motor 2, the first piston assembly 83 has a first piston oil passage, and the second piston assembly 84 has a second piston oil passage.

When the second gear is hung, the first piston assembly 83 pushes the fork shaft 85 to the first gear shifting position, the gear shifting transmission piece 45 is contacted with the end part of the combining tooth 46 of the second gear driven gear 43, and the first oil chamber 815 is communicated with the first motor connecting port 812 through the first piston oil channel;

when the first gear is engaged, the second piston assembly 84 pushes the fork shaft 85 to the second shift position, the shift transmission member 45 contacts with the end of the engaging tooth 46 of the first-gear driven gear 41, and the second oil chamber 825 is in communication with the second motor connecting port 822 through the second piston oil passage;

the hydraulic oil that has entered the hydraulic motor 2 through the first motor connecting port 812 and the second motor connecting port 822 is used to drive the hydraulic motor 2.

Provide power by hydraulic motor 2, when shifting, hydraulic motor 2 stops power input, before the completion of shifting, partial hydraulic oil flows into hydraulic motor 2 through first motor connector 812 or second motor connector 822, drive the input shaft that hydraulic motor 2 drove the gearbox and rotate certain angle, it all rotates certain angle to drive one fender driven gear 41 and two fender driven gear 43, be convenient for shift driving medium 45 and cut into smoothly, avoid shifting driving medium 45 and moving the in-process, the phenomenon of "tooth to tooth" appears with the driving tooth that needs cut into in shift driving medium 45, can't accomplish the meshing, the phenomenon of hanging not keeping off appears.

Specifically, the first piston assembly 83 includes a first piston 832 and a first valve core 831, the first piston 832 is slidably disposed in the first hydraulic cylinder 81 and divides an inner cavity of the first hydraulic cylinder 81 into a first oil cavity 815 and a first fork shaft cavity 816, the first piston 832 is provided with a first valve core mounting hole penetrating through two ends of the first piston 832 in the moving direction, the first valve core 831 is disposed in the first valve core mounting hole in a penetrating manner, the first piston 832 is provided with a first piston assembly hole, the first valve core 831 is provided with a first valve core groove 8311, when the fork shaft 85 is located at a first shifting position, the shifting transmission member 45 is in contact with an end of the engaging tooth 46 of the two-stage driven gear 43, the first piston assembly hole is communicated with the first motor connecting port 812, the first valve core groove 8311 is communicated with the first oil cavity 815, and the first valve core groove 8311 is communicated with the first piston assembly hole to form a first piston oil passage;

the second piston assembly 84 includes a second piston 842 and a second valve core 841, the second piston 842 is slidably disposed in the second hydraulic cylinder 82 and divides the inner cavity of the second hydraulic cylinder 82 into a second oil cavity 825 and a second fork cavity 826, the second piston 842 has a second valve core mounting hole penetrating through both ends of the second piston 842 in the moving direction, the second valve core 841 is disposed in the second valve core mounting hole, the second piston 842 has a second piston assembly hole, the second valve core 841 has a second valve core groove 8411, when the fork 85 is located at the second shift position, the shift transmission member 45 contacts with the end of the engaging tooth 46 of the first driven gear 41, the second piston assembly hole is communicated with the second motor connecting port 822, the second valve core groove 8411 is communicated with the second oil cavity 825, and the second valve core groove 8411 is communicated with the second piston assembly hole to form a second piston oil passage.

Before the gear shifting transmission member 45 reaches the gear shifting position, hydraulic oil cannot enter the hydraulic motor 2, the first piston oil duct and the second piston oil duct are blocked, leakage of the hydraulic oil in the first oil chamber 815 and the second oil chamber 825 is reduced, sufficient thrust is kept in the first oil chamber 815 or the second oil chamber 825 to push the fork shaft 85 and the shifting fork 86 to move, and when the shifting fork 86 drives the gear shifting transmission member 45 to reach the gear shifting position, the first piston oil duct or the second piston oil duct is communicated with the hydraulic motor 2, so that the hydraulic oil enters the hydraulic motor 2 to drive the input shaft of the gearbox to rotate, and the first-gear driven gear 41 and the second-gear driven gear 43 rotate for a certain angle.

As a further scheme of this embodiment, the valve further includes a first guiding and positioning sleeve 881 and a second guiding and positioning sleeve 882, where the first guiding and positioning sleeve 881 is fixed in the first fork shaft cavity 816, the second guiding and positioning sleeve 882 is fixed in the second fork shaft cavity 826, the fork shaft 85 is slidably disposed in the first guiding and positioning sleeve 881 and the second guiding and positioning sleeve 882, the first valve element 831 is slidably disposed in the first valve element mounting hole, and the second valve element 841 is slidably disposed in the second valve element mounting hole;

when the second gear is hung, the fork shaft 85 is located at the first gear shifting position, the end of the first piston 832 is abutted to the first guide positioning sleeve 881, the first valve core 831 continues to push the fork shaft 85 to move so that the gear shifting transmission member 45 completes gear shifting, and the first valve core groove 8311 is disconnected from the first oil cavity 815;

when the first gear is engaged, the fork 85 is in the second shift position, the end of the second piston 842 abuts against the second pilot positioning sleeve 882, the second spool 841 continues to push the fork 85 to move the shift transmission member 45 to complete the shift, and the second spool groove 8411 is disconnected from the second oil chamber 825.

The first valve core 831 slides in the first piston 832, when the first piston 832 moves to abut against the first guide positioning sleeve 881, the first piston oil passage is communicated with the first oil chamber 815 and the first motor connecting port 812, the first valve core 831 continues to move to finish gear shifting, the first valve core groove 8311 is disconnected from the first oil chamber 815 after the first valve core 831 moves, and oil is not fed into the hydraulic motor 2 any more; or the second spool 841 slides in the second piston 842, when the second piston 842 moves to abut against the second guiding and positioning sleeve 882, the second piston oil passage communicates the second oil chamber 825 with the second motor connecting port 822, the second spool 841 continues to move to complete gear shifting, and after the second spool 841 moves, the second spool groove 8411 is disconnected from the second oil chamber 825, and no oil is fed into the hydraulic motor 2.

As a further scheme of the embodiment, a first oil return hole 813 and a second oil return hole 823 are respectively formed in the first fork shaft cavity 816 and the second fork shaft cavity 826, the first oil return hole 813 and the second oil return hole 823 are both communicated with a hydraulic oil tank, a first gap is formed between the first valve element 831 and the first piston 832, a second gap is formed between the second valve element 841 and the second piston 842, a third gap and a fourth gap are respectively formed between the fork shaft 85 and the first guide positioning sleeve 881 and the second guide positioning sleeve 882, a first positioning sleeve oil return hole 8811 communicated with the first oil return hole 813 is formed in the first guide positioning sleeve 881, a second positioning sleeve oil return hole 8821 communicated with the second oil return hole 823 is formed in the second guide positioning sleeve 882, the first gap is communicated with the first positioning sleeve oil return hole 8811 through the third gap, and the second positioning sleeve oil return hole 8821 are communicated through the fourth gap.

As a further scheme of this embodiment, two ends of the first valve element 831 and the second valve element 841 are respectively sleeved with a steel wire retainer 89, and the steel wire retainer 89 is used for limiting the position of the first valve element 831 or the second valve element 841 connected thereto. Specifically, the outer walls of the two ends of the first valve core 831 and the second valve core 841 are both processed with annular retainer grooves, and the steel wire retainer rings 89 are embedded in the retainer grooves in a one-to-one correspondence manner.

Specifically, the first positioning sleeve oil return hole 8811 is disposed along a radial direction of the first guiding positioning sleeve 881, and one end thereof communicates with the first positioning sleeve oil return hole 8811, and the other end communicates with the third gap. An annular first oil return groove is further formed in the outer side of one end, corresponding to the first positioning sleeve oil return hole 8811, of the first guiding and positioning sleeve 881, and the first oil return groove is communicated with one end of the first positioning sleeve oil return hole 8811; the second positioning sleeve oil return hole 8821 is arranged along the radial direction of the second positioning sleeve 882, one end of the second positioning sleeve oil return hole 8821 is communicated with the second positioning sleeve oil return hole, the other end of the second positioning sleeve oil return hole is communicated with the fourth gap, an annular second oil return groove is further arranged on the outer side of one end, corresponding to the second positioning sleeve oil return hole 8821, of the second positioning sleeve 882, and the second oil return groove is communicated with one end of the second positioning sleeve oil return hole 8821.

As the further scheme of this embodiment, still include the forked axle sealing washer, the inboard of the one end that first direction position sleeve 881 and second direction position sleeve 882 are close to the casing 1 inner chamber all has the interior seal groove of position sleeve, all inlays in the interior seal groove of position sleeve of first direction position sleeve 881 and second direction position sleeve 882 and is equipped with the forked axle sealing washer.

As a further scheme of the present embodiment, the hydraulic oil cylinder further includes a first adjusting bolt 814 and a second adjusting bolt 824, one end of the first hydraulic oil cylinder 81 has a first adjusting threaded hole 817 coaxially disposed with the first piston assembly 83, the first adjusting bolt 814 is in threaded connection with the first adjusting threaded hole 817, and one end thereof extends into the first oil chamber 815; one end of the second hydraulic cylinder 82 has a second adjusting threaded hole 827 coaxially disposed with the second piston assembly 84, the second adjusting bolt 824 is threadedly coupled to the second adjusting threaded hole 827, one end of the second adjusting bolt 824 extends into the second oil chamber 825, and the first adjusting bolt 814 and the second adjusting bolt 824 can limit the position of the fork shaft 85 moving to both sides.

As a further scheme of this embodiment, the hydraulic cylinder further includes a first seal nut and a second seal nut, the first seal nut is coaxially disposed with the first adjusting threaded hole 817 and fixedly connected to the outer side of the first hydraulic cylinder 81, and the first adjusting bolt 814 is in threaded connection with the first seal nut; the second gland nut is coaxially disposed with the second adjustment screw hole 827 and fixedly connected to the outside of the second hydraulic cylinder 82, and the second adjustment bolt 824 is threadedly connected to the second gland nut.

As a further scheme of this embodiment, the hydraulic cylinder further includes a first sealing ring, outer walls of the first piston 832 and the second piston 842 are provided with annular piston sealing grooves, the piston sealing grooves are located between the first piston hole 8321 or the second piston hole 8421 and the fork shaft 85, the first sealing ring is embedded in the piston sealing groove of the first piston 832 and the second piston 842, and the first sealing ring seals gaps between the first piston 832 and the first hydraulic cylinder 81 and between the second piston 842 and the second hydraulic cylinder 82, so as to avoid oil leakage.

As a further scheme of this embodiment, the hydraulic cylinder device further includes a second sealing ring, the opening edges of the first hydraulic cylinder 81 and the second hydraulic cylinder 82 close to the inner cavity of the housing 1 are both provided with a cylinder body sealing groove, and the second sealing rings are embedded in the cylinder body sealing grooves of the first hydraulic cylinder 81 and the second hydraulic cylinder 82.

As the further scheme of this embodiment, still include the third sealing washer, the lateral wall that first direction position sleeve 881 and second direction position sleeve 882 are close to 1 inner chamber one end of casing all has the position sleeve outer seal groove, all inlays in the position sleeve outer seal groove of first direction position sleeve 881 and second direction position sleeve 882 and is equipped with the third sealing washer.

As the further scheme of this embodiment, still include locking ball 87, the upside outer wall of fork 85 has opened first locking hole in proper order along the axial, second locking hole and third locking hole, casing 1 and fork 85 sliding connection part have the locking passageway that supplies locking ball 87 to remove, the locking passageway upper end is sealed and the lower extreme is opened, the locking passageway is vertical, locking ball 87 elasticity is spacing in the locking passageway, locking ball 87 top is provided with pressure spring, the pressure spring both ends respectively with locking ball 87 and locking passageway upper end butt, through first locking hole or second locking hole or third locking hole and locking ball 87 and locking passageway cooperation, with fork 85 at the relevant position auto-lock, prevent that it from moving along the axial by oneself, it is specific:

when the second gear is hung, the gear shifting transmission piece 45 is simultaneously meshed with the gear hub 42 and the combination teeth 46 of the second gear driven gear 43, the lower end of the locking channel is opposite to the first locking hole, the lower part of the locking ball 87 is embedded into the first locking hole, and the upper part of the locking ball 87 is arranged in the locking channel;

when the neutral gear is engaged, the gear shifting transmission piece 45 is only meshed with the gear hub 42, the lower end of the locking channel is opposite to the second locking hole, the lower part of the locking ball 87 is embedded into the second locking hole, and the upper part of the locking ball 87 is arranged in the locking channel;

when the first gear is engaged, the gear shifting transmission piece 45 is simultaneously meshed with the gear hub 42 and the combination teeth 46 of the first gear driven gear 41, the lower end of the locking channel is opposite to the third locking hole, the lower part of the locking ball 87 is embedded into the third locking hole, and the upper part of the locking ball 87 is arranged in the locking channel.

After the gear shifting is completed, the lower part of the locking ball 87 is embedded into the corresponding locking hole and matched with the locking channel, so that the fork shaft 85 can be prevented from moving, the gear shifting transmission piece 45 is kept meshed with the corresponding transmission gear, and the random movement of the fork shaft 85 in a non-gear shifting state is avoided.

As a further scheme of the embodiment, the differential mechanism 6 and the three-shaft final gear 52 are further included, the three-shaft final gear 52 is arranged on the three shafts 5 and is coaxially and fixedly connected with the three shafts 5, the three-shaft final gear 52 is meshed with an input gear 61 of the differential mechanism, and power input by a motor is output through the three shafts 5 through the differential mechanism 6.

As a further scheme of the present embodiment, a first brake 71, a second brake 72 and a third brake 73 are further included, the differential 6 has a first output shaft 62 and a second output shaft 63, the first output shaft 62 and the second output shaft 63 are respectively rotatably connected with two opposite sides of the housing 1, the first brake 71 and the second brake 72 are respectively disposed on two opposite sides of the housing 1, the first brake 71 is used for braking the first output shaft 62, the second brake 72 is used for braking the second output shaft 63, the third brake 73 is disposed on the housing 1 at one end of the three shafts 5, the third brake 73 is used for braking the three shafts 5, the third brake 73 is a hand brake, and a method for braking the shafts by connecting the brakes with the housing 1 is prior art.

when the gear is shifted towards the direction of the second hydraulic cylinder 82, the first gear is shifted towards the neutral gear or the neutral gear is shifted towards the second gear or the first gear is shifted towards the second gear, the first valve is opened, the second valve is closed, hydraulic oil enters the first hydraulic cylinder 81, the first piston assembly 83 is pushed, the first piston assembly 83 pushes the fork shaft 85 to drive the shifting fork 86 to move towards the direction of the second hydraulic cylinder 82, the gear shifting transmission piece 45 is meshed with the corresponding transmission teeth, and the gear shifting towards the direction of the second hydraulic cylinder 82 is realized;

when the gear is shifted in the direction of the first hydraulic oil cylinder 81, including that the second gear is shifted to the neutral gear or the neutral gear is shifted to the first gear or the second gear is shifted to the first gear, the second valve is opened, the first valve is closed, hydraulic oil enters the second hydraulic oil cylinder 82, the second piston assembly 84 is pushed, the second piston assembly 84 pushes the fork shaft 85 to drive the shift fork 86 to move towards the direction of the first hydraulic oil cylinder 81, so that the gear shifting transmission member 45 is meshed with the corresponding transmission teeth, and the gear shifting in the direction of the first hydraulic oil cylinder 81 is realized.

Of course, the present invention may have other embodiments, and those skilled in the art may make various corresponding changes and modifications according to the present invention without departing from the spirit and the essence of the present invention, and these corresponding changes and modifications should fall within the protection scope of the appended claims.

Claims

1. A control system of an electro-hydraulic control gearbox is characterized in that: the hydraulic oil cylinder type hydraulic oil cylinder comprises a hydraulic oil tank, a first valve, a second valve, a first hydraulic oil cylinder (81), a second hydraulic oil cylinder (82), a first piston assembly (83) and a second piston assembly (84), wherein the first hydraulic oil cylinder (81) and the second hydraulic oil cylinder (82) are arranged oppositely, the first piston assembly (83) is arranged in the first hydraulic oil cylinder (81) in a sliding mode and divides the first hydraulic oil cylinder (81) into a first oil cavity (815) and a first fork shaft cavity (816), the second piston assembly (84) is arranged in the second hydraulic oil cylinder (82) in a sliding mode and divides the second hydraulic oil cylinder (82) into a second oil cavity (825) and a second fork shaft cavity (826), two ends of a fork shaft (85) are arranged in the first fork shaft cavity (816) and the second fork shaft cavity (826) in a sliding mode respectively and are abutted to the first piston assembly (83) and the second piston assembly (84) respectively, the first oil cavity (815) and the second oil cavity (825) are communicated with an oil outlet end of the hydraulic oil tank through a pipeline respectively, the first valve is arranged on the pipeline between the first oil cavity (815) and the hydraulic oil tank, the second valve is arranged on the pipeline between the second oil cavity (825) and the hydraulic oil tank, and the hydraulic oil tank supplies energy to the first oil cavity (815) or the second oil cavity (825).

2. The control system of an electro-hydraulically controlled transmission according to claim 1, wherein: still include hydraulic motor (2) and third valve, the output of hydraulic motor (2) is connected with the input transmission of gearbox, hydraulic tank's the end that produces oil pass through the pipeline with the oil feed end intercommunication of hydraulic motor (2), the end that produces oil of hydraulic motor (2) pass through the pipeline with hydraulic tank intercommunication, the third valve set up in hydraulic motor's (2) the oil feed end with on the pipeline between hydraulic tank's the end that produces oil, hydraulic tank to hydraulic motor (2) energy supply, hydraulic motor (2) be used for to gearbox input power.

3. The control system of an electro-hydraulically controlled transmission according to claim 2, wherein: the middle part of the first hydraulic oil cylinder (81) is provided with a first motor connecting port (812), the middle part of the second hydraulic oil cylinder (82) is provided with a second motor connecting port (822), the first motor connecting port (812) and the second motor connecting port (822) are both communicated with the oil inlet end of the hydraulic motor (2), the first piston assembly (83) is provided with a first piston oil channel, and the second piston assembly (84) is provided with a second piston oil channel;

the first oil chamber (815) is communicated with the first motor connection port (812) through the first piston oil passage when the first piston assembly (83) pushes the fork shaft (85) to a first shift position;

when the second piston assembly (84) pushes the fork shaft (85) to a second shifting position, the second oil chamber (825) is communicated with the second motor connecting port (822) through the second piston oil passage;

the hydraulic oil entering the hydraulic motor (2) through the first motor connection port (812) and the second motor connection port (822) is used to drive the hydraulic motor (2).

4. The control system of the electro-hydraulically controlled transmission of claim 3, wherein: the first piston assembly (83) includes a first piston (832) and a first valve spool (831), the first piston (832) is slidably disposed within the first hydraulic ram (81), and divides the inner cavity of the first hydraulic oil cylinder (81) into a first oil cavity (815) and a first fork shaft cavity (816), the first piston (832) has a first spool mounting hole penetrating both ends in a moving direction thereof, the first valve core (831) is arranged in the first valve core mounting hole in a penetrating way, the first piston (832) is provided with a first piston assembly hole, the first valve spool (831) has a first valve spool groove (8311), and when the fork shaft (85) is located at a first gear shifting position, the first piston assembly bore is in communication with the first motor connection port (812) and the first valve spool groove (8311) is in communication with the first oil chamber (815), the first spool groove (8311) communicates with the first piston assembly bore forming the first piston gallery;

the second piston assembly (84) includes a second piston (842) and a second spool (841), the second piston (842) is slidably disposed within the second hydraulic cylinder (82), and divides the inner cavity of the second hydraulic oil cylinder (82) into a second oil cavity (825) and a second forked shaft cavity (826), the second piston (842) has a second spool mounting hole passing through both ends in the moving direction thereof, the second valve core (841) is arranged in the second valve core mounting hole in a penetrating way, the second piston (842) is provided with a second piston assembly hole, the second spool (841) having a second spool groove (8411), the fork shaft (85) being in a second shift position, the second piston assembly bore communicates with the second motor connection port (822) and the second spool groove (8411) communicates with the second oil chamber (825), the second spool groove (8411) communicates with the second piston assembly bore to form the second piston gallery.

5. The control system of the electro-hydraulically controlled transmission of claim 4, wherein: the valve core is characterized by further comprising a first guide positioning sleeve (881) and a second guide positioning sleeve (882), wherein the first guide positioning sleeve (881) is fixed in the first fork shaft cavity (816), the second guide positioning sleeve (882) is fixed in the second fork shaft cavity (826), the fork shaft (85) is arranged in the first guide positioning sleeve (881) and the second guide positioning sleeve (882) in a sliding manner, the first valve core (831) is arranged in the first valve core mounting hole in a sliding manner, and the second valve core (841) is arranged in the second valve core mounting hole in a sliding manner;

when the fork shaft (85) is located at a first shifting position, the end of the first piston (832) is abutted to the first guide positioning sleeve (881), the first valve core (831) continuously pushes the fork shaft (85) to move so that a shifting transmission member (45) completes shifting, and the first valve core groove (8311) is disconnected from the first oil cavity (815);

when the fork shaft (85) is located at the second shifting position, the end of the second piston (842) is abutted to the second guide positioning sleeve (882), the second valve core (841) continuously pushes the fork shaft (85) to move so that the shifting transmission member (45) completes shifting, and the second valve core groove (8411) is disconnected from the second oil chamber (825).

6. The control system of an electro-hydraulically controlled transmission according to claim 5, wherein: the first fork shaft cavity (816) and the second fork shaft cavity (826) are respectively provided with a first oil return hole (813) and a second oil return hole (823), the first oil return hole (813) and the second oil return hole (823) are communicated with the hydraulic oil tank, a first gap is formed between the first valve core (831) and the first piston (832), a second gap is formed between the second valve core (841) and the second piston (842), a third gap and a fourth gap are respectively formed between the fork shaft (85) and the first guide positioning sleeve (881) and the second guide positioning sleeve (882), the first guide positioning sleeve (881) is provided with a first positioning sleeve oil return hole (8811) communicated with the first oil return hole (813), and the second guide positioning sleeve (882) is provided with a second positioning sleeve oil return hole (8821) communicated with the second oil return hole (823), the first gap is communicated with the first positioning sleeve oil return hole (8811) through the third gap, and the second gap is communicated with the second positioning sleeve oil return hole (8821) through the fourth gap.

7. The control system of the electro-hydraulically controlled transmission of claim 4, wherein: the two ends of the first valve core (831) and the second valve core (841) are respectively sleeved with a steel wire retainer ring (89), and the steel wire retainer rings (89) are used for limiting the first valve core (831) or the second valve core (841) which are connected with the first valve core (831).

8. The control system of an electro-hydraulically controlled transmission according to any one of claims 1 to 7, characterized by: the first valve and the second valve are electromagnetic valves, and the first valve and the second valve are electrically connected with the controller and are controlled by the controller.

9. The control system of an electro-hydraulically controlled transmission according to claim 8, wherein: still include and keep off position sensor, keep off position sensor with the controller carries out data communication, it is used for confirming to keep off position when fork axle (85) accomplishes different fender gears and shifts gears.