CN110425264B - Control system and control method for electrohydraulic control gearbox - Google Patents

Control system and control method for electrohydraulic control gearbox Download PDF

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Publication number
CN110425264B
CN110425264B CN201910832707.1A CN201910832707A CN110425264B CN 110425264 B CN110425264 B CN 110425264B CN 201910832707 A CN201910832707 A CN 201910832707A CN 110425264 B CN110425264 B CN 110425264B
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China
Prior art keywords
hydraulic oil
oil
piston
gear
hydraulic
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CN201910832707.1A
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Chinese (zh)
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CN110425264A (en
Inventor
李洪江
王伟
葛宏坤
孙元帅
林本珠
周伟
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Shandong Lovol Transmission Co ltd
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Shandong Lovol Transmission Co ltd
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Priority to CN201910832707.1A priority Critical patent/CN110425264B/en
Publication of CN110425264A publication Critical patent/CN110425264A/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H47/00—Combinations of mechanical gearing with fluid clutches or fluid gearing
    • F16H47/02—Combinations of mechanical gearing with fluid clutches or fluid gearing the fluid gearing being of the volumetric type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H48/00—Differential gearings
    • F16H48/12—Differential gearings without gears having orbital motion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H48/00—Differential gearings
    • F16H48/20—Arrangements for suppressing or influencing the differential action, e.g. locking devices
    • F16H48/22—Arrangements for suppressing or influencing the differential action, e.g. locking devices using friction clutches or brakes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/02—Gearboxes; Mounting gearing therein
    • F16H57/023—Mounting or installation of gears or shafts in the gearboxes, e.g. methods or means for assembly
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/18—Preventing unintentional or unsafe shift, e.g. preventing manual shift from highest gear to reverse gear
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/26—Generation or transmission of movements for final actuating mechanisms
    • F16H61/28—Generation or transmission of movements for final actuating mechanisms with at least one movement of the final actuating mechanism being caused by a non-mechanical force, e.g. power-assisted
    • F16H61/30—Hydraulic or pneumatic motors or related fluid control means therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H47/00—Combinations of mechanical gearing with fluid clutches or fluid gearing
    • F16H47/02—Combinations of mechanical gearing with fluid clutches or fluid gearing the fluid gearing being of the volumetric type
    • F16H2047/025—Combinations of mechanical gearing with fluid clutches or fluid gearing the fluid gearing being of the volumetric type the fluid gearing comprising a plurality of pumps or motors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/18—Preventing unintentional or unsafe shift, e.g. preventing manual shift from highest gear to reverse gear
    • F16H2061/185—Means, e.g. catches or interlocks, for preventing unintended shift into reverse gear

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Gear-Shifting Mechanisms (AREA)

Abstract

The invention discloses a control system of an electrohydraulic control gearbox, which comprises a hydraulic oil tank, a first hydraulic oil cylinder, a second hydraulic oil cylinder, a first piston assembly and a second piston assembly, wherein the first hydraulic oil cylinder and the second hydraulic oil cylinder are oppositely arranged, the first piston assembly is arranged in the first hydraulic oil cylinder in a sliding way, the second piston assembly is arranged in the second hydraulic oil cylinder in a sliding way, two ends of a fork shaft are respectively arranged in the first hydraulic oil cylinder and the second hydraulic oil cylinder in a sliding way and respectively abutted against the first piston assembly and the second piston assembly, the first hydraulic oil cylinder and the second hydraulic oil cylinder are respectively communicated with the hydraulic oil tank, and a first valve and a second valve are respectively arranged between the first hydraulic oil cylinder and the second hydraulic oil cylinder and the hydraulic oil tank. The control system and the control method of the electrohydraulic control gearbox provided by the invention have the advantages of high control precision, shortened gear shifting time and reduced power loss in the gear shifting process.

Description

Control system and control method for electrohydraulic control gearbox
Technical Field
The invention relates to the technical field of gearbox control, in particular to a control system and a control method of an electrohydraulic control gearbox.
Background
At present, the agricultural harvesting machine gearbox in the prior art generally adopts a mechanical manual gear shifting mode, namely a mode of a mechanical handle, a pull rod or a mechanical handle and a pull wire, and the gear shifting mode has the problems of difficult adjustment, high labor intensity and the like, and particularly in the middle-area, frequent turning and turning are required, so that the labor intensity of a manipulator is increased; during the use process, the gear shifting mechanism needs to be frequently adjusted along with the abrasion of parts, and if the gear shifting mechanism is not timely adjusted, secondary faults such as abrasion of a meshing sleeve, abrasion of a gear shifting gear and the like can be caused; the mechanical gear shifting mode generally needs to carry out the gear selecting and shifting processes after clutch, so that the gear shifting time is increased, and the energy consumption and the waste are caused.
Disclosure of Invention
The invention aims to provide a control system and a control method of an electrohydraulic control gearbox, which have high control precision and good reliability, shorten the gear shifting time and reduce the power loss in the gear shifting process.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the invention discloses a control system of an electrohydraulic 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 assembly and a second piston assembly, wherein the first hydraulic oil cylinder and the second hydraulic oil cylinder are oppositely arranged, the first piston assembly is arranged in the first hydraulic oil cylinder in a sliding manner and divides the first hydraulic oil cylinder into a first oil cavity and a first fork shaft cavity, the second piston assembly is arranged in the second hydraulic oil cylinder in a sliding manner 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 manner and are respectively abutted against the first piston assembly and the second piston assembly, 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, and the second valve is arranged on a pipeline between the second oil cavity and the second oil cavity or the hydraulic oil tank.
The beneficial effects of the invention are as follows: when a gear is required to be shifted to the direction of the second hydraulic oil 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 oil cylinder, the piston assembly pushes the fork shaft, the fork shaft drives the shifting fork, the shifting fork pushes the gear shifting transmission piece, the gear shifting transmission piece is meshed with transmission teeth in the direction of the second hydraulic oil cylinder, and gear shifting to the direction of the second hydraulic oil cylinder is achieved; if the first valve is closed when the gear is required to be shifted towards the direction of the first hydraulic oil cylinder, the second valve is opened, hydraulic oil enters the second oil cavity, the second piston assembly is pushed to move towards the direction of the first hydraulic oil cylinder, the same principle as that when the gear is shifted towards the direction of the second hydraulic oil cylinder is adopted, the gear shifting transmission piece is meshed with the transmission teeth in the direction of the first hydraulic oil cylinder, the gear shifting towards the direction of the first hydraulic oil cylinder is realized, the moving distance of the fork shaft is controlled through the hydraulic oil, the control precision is high, the reliability is good, the gear selection process is free from direct gear shifting, the gear shifting time is shortened, and the power loss in the gear shifting process is reduced.
Further, the hydraulic motor is further arranged on the pipeline between the oil inlet end of the hydraulic motor and the oil outlet end of the hydraulic oil tank, the hydraulic oil tank supplies energy to the hydraulic motor, and the hydraulic motor is used for inputting power to the gearbox.
The beneficial effects of adopting the further scheme are as follows: the hydraulic motor inputs power to the gearbox, when gear shifting is needed, the third valve is closed, the hydraulic motor stops inputting power to the gearbox, gear shifting is convenient, a clutch is not needed, and control is convenient.
Further, a first motor connection port is formed in the middle of the first hydraulic oil cylinder, a second motor connection port is formed in the middle of the second hydraulic oil cylinder, the first motor connection port and the second motor connection 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 duct;
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 duct;
and 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 effects of adopting the further scheme are as follows: when the gear is shifted, the hydraulic motor stops power input, before the gear shifting is completed, part of hydraulic oil flows into the hydraulic motor through the first motor connector or the second motor connector, the hydraulic motor is driven to drive the input shaft of the gearbox to rotate for a certain angle, so that the gear shifting transmission piece is convenient to cut in smoothly, the phenomenon that the gear shifting transmission piece and a transmission tooth needing to cut in are in a gear shifting transmission piece moving process is avoided, meshing cannot be completed, and the phenomenon that gear is not up-shifted is caused.
Further, the first piston assembly comprises a first piston and a first valve core, the first piston is arranged in the first hydraulic cylinder in a sliding manner, the inner cavity of the first hydraulic cylinder is divided 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 moving direction of the first piston, the first valve core is arranged in the first valve core mounting hole in a penetrating manner, 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 positioned 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 the first piston oil duct;
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, the inner cavity of the second hydraulic cylinder is divided 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 moving direction of the second piston, the second valve core is arranged in the second valve core mounting hole in a penetrating mode, 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 duct.
The beneficial effects of adopting the further scheme are as follows: before the gear shifting transmission piece reaches a gear shifting position, hydraulic oil cannot enter the hydraulic motor, the first piston oil duct and the second piston oil duct are blocked, hydraulic oil leakage in the first oil chamber and the second oil chamber is reduced, enough thrust is kept in the first oil chamber or the second oil chamber 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, so that hydraulic oil enters the hydraulic motor, and the input shaft of the gearbox is driven to rotate.
Further, the device also comprises a first guide positioning sleeve and a second guide positioning sleeve, wherein 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 shaft is slidably arranged in the first guide positioning sleeve and the second guide positioning sleeve, the first valve core is slidably arranged in the first valve core mounting hole, and the second valve core is slidably arranged in the second valve core mounting hole;
when the fork shaft is positioned at a first gear shifting position, the end part of the first piston is abutted with the first guide positioning sleeve, the first valve core continuously pushes the fork shaft to move so that the gear shifting transmission piece finishes gear shifting, and the first valve core groove is disconnected with the first oil cavity;
When the fork shaft is positioned at a second gear shifting position, the end part of the second piston is abutted with the second guide positioning sleeve, the second valve core continuously pushes the fork shaft to move so that the gear shifting transmission piece finishes gear shifting, and the second valve core groove is disconnected with the second oil cavity.
The beneficial effects of adopting the further scheme are as follows: the first valve core slides in the first piston, when the first piston moves to be abutted 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, and after the first valve core moves, the first valve core groove is disconnected from the first oil cavity and does not feed oil into the hydraulic motor; or the second valve core slides in the second piston, when the second piston moves to be in butt joint with 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, and after the second valve core moves, the second valve core groove is disconnected from the second oil cavity, and oil is not fed into the hydraulic motor any more.
Further, 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 between 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 through the fourth gap.
The beneficial effects of adopting the further scheme are as follows: the hydraulic oil remaining in the first gap, the second gap, the third gap and the fourth gap can be returned to the hydraulic oil tank.
Further, steel wire check rings are sleeved at two ends of the first valve core and the second valve core, and the steel wire check rings are used for limiting the first valve core or the second valve core connected with the steel wire check rings.
The beneficial effects of adopting the further scheme are as follows: the first valve core and the second valve core respectively move in the first piston and the second piston, and 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 check ring at the corresponding end can prop against the end face of the corresponding end of the first piston or the second piston, so that the first valve core or the second valve core is prevented from being separated from the first piston or the second piston.
Further, the automatic control device also comprises a controller, wherein 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 controlled by the controller.
The beneficial effects of adopting the further scheme are as follows: the control is convenient, and the control of the hydraulic oil is more accurate.
Further, the shift control device also comprises a gear sensor, wherein the gear sensor is in data communication with the controller and is used for determining the position of the shifting fork when different gears are shifted.
The beneficial effects of adopting the further scheme are as follows: before shifting is completed, hydraulic oil is kept to be provided for the oil cavity, shifting fork is pushed to move, after the gear sensor detects that the shifting fork reaches a preset position to complete shifting, the gear sensor feeds signals back to the controller, the controller controls the corresponding valve to be closed, hydraulic oil is stopped to be provided for the oil cavity, and excessive shifting is avoided.
The invention discloses a control method of a control system of an electrohydraulic control gearbox, which comprises the following steps: by adopting the control system of the electrohydraulic control gearbox,
when shifting to the direction of the second hydraulic oil cylinder, the first valve is opened, the second valve is closed, hydraulic oil in the hydraulic oil tank enters the first hydraulic oil 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 oil cylinder to realize shifting towards the direction of the second hydraulic oil cylinder;
when shifting gears 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 to realize shifting gears towards the direction of the first hydraulic oil cylinder.
The beneficial effects of the invention are as follows: the control precision is high, the reliability is good, the gear selection process is not used for directly shifting gears, the gear shifting time is shortened, and the power loss in the gear shifting process is reduced.
Drawings
FIG. 1 is a schematic diagram of a hydraulic motor, a first hydraulic cylinder, a second hydraulic cylinder, and a transmission;
FIG. 2 is a schematic view of a hydraulic circuit according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of the connection of the hydraulic motor, the first hydraulic cylinder, the second hydraulic cylinder and the housing;
FIG. 4 is a schematic diagram of a transmission;
FIG. 5 is a schematic diagram of the transmission in neutral;
FIG. 6 is a schematic diagram of the transmission in first gear;
FIG. 7 is a schematic diagram of the transmission in second gear;
FIG. 8 is a schematic illustration of a first hydraulic ram and first piston assembly connection according to an embodiment of the present invention;
FIG. 9 is a control signal transmission diagram of the present invention;
in the figure: 1-housing, 2-hydraulic motor, 21-coupling sleeve, 3-primary shaft, 31-primary drive gear, 32-secondary drive gear, 4-secondary shaft, 41-primary driven gear, 42-gear hub, 43-secondary driven gear, 44-secondary normally engaged gear, 45-shift transmission, 46-coupling gear, 5-primary, 51-primary normally engaged gear, 52-primary final gear, 6-differential, 61-differential input gear, 62-primary output shaft, 63-secondary output shaft, 71-primary brake, 72-secondary brake, 73-tertiary brake, 81-primary hydraulic cylinder, 811-primary oil inlet, 812-primary motor connection port, 813-primary oil return hole, 814-primary adjusting bolt 815-first oil chamber, 816-first tuning screw bore, 82-second hydraulic cylinder, 821-second oil inlet, 822-second motor connection port, 823-second oil return bore, 824-second tuning screw, 825-second oil chamber, 826-second tuning screw bore, 83-first piston assembly, 831-first valve core slot, 8311-first valve core slot, 832-first piston bore, 84-second piston assembly, 841-second valve core slot, 842-second piston, 8421-second piston bore, 85-fork, 86-fork, 87-locking ball, 881-first guide sleeve, 8811-a first positioning sleeve oil return hole, 882-a second guiding positioning sleeve, 8821-a second positioning sleeve oil return hole and 89-a steel wire retainer ring.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings, in order to make the objects, technical solutions and advantages of the present invention more apparent.
As shown in fig. 1-9, the control system of the electrohydraulic control gearbox disclosed by the invention comprises a hydraulic oil tank, a hydraulic motor 2, a first valve, a second valve, a third valve, a first hydraulic oil cylinder 81, a second hydraulic oil cylinder 82, a first piston component 83 and a second piston component 84, wherein a fork shaft 85, a fork 86 and a gear shifting transmission piece 45 are arranged in the gearbox, the first hydraulic oil cylinder 81 and the second hydraulic oil cylinder 82 are oppositely arranged, the first piston component 83 is arranged in the first hydraulic oil cylinder 81 in a sliding manner and divides the first hydraulic oil cylinder 81 into a first oil cavity 815 and a first fork shaft cavity 816, the second piston component 84 is arranged in the second hydraulic oil cylinder 82 in a sliding manner and divides the second hydraulic oil cylinder 82 into a second oil cavity 825 and a second fork shaft cavity 826, two ends of the fork shaft 85 are respectively arranged in the first fork shaft cavity 816 and the second fork shaft cavity 826 and are respectively in contact with the first piston component 83 and the second piston component 84, the fork 86 is fixedly connected with the fork shaft 85, the first oil cavity 811 is arranged in the first oil cavity, the second oil cavity is provided with the second valve, the second oil cavity is arranged between the first oil cavity is communicated with the hydraulic motor valve 2 and the oil tank through the first oil inlet end and the hydraulic motor valve 2 and the oil inlet end of the oil tank, the hydraulic motor 2 is communicated with the oil tank through the first oil inlet end and the second oil inlet end of the hydraulic valve 2 and the oil inlet end of the hydraulic oil tank, the hydraulic motor is communicated with the oil tank through the second oil inlet end 2 and the oil inlet end of the hydraulic valve is arranged on the oil inlet end 2.
The hydraulic oil tank is used to power the first oil chamber 815, the second oil chamber 825, and the hydraulic motor 2, and the hydraulic oil tank is preferably used as the hydraulic oil tank of the hydraulic motor 2 itself.
The shifting fork 86 is used for pushing the shifting transmission member 45 to move so that the shifting transmission member 45 is meshed with transmission teeth of different gears to realize shifting, and the shifting transmission member 45 can be a meshing sleeve or a sliding gear.
Specifically, the gearbox is also provided with a shell 1, a power input system, a power output system, a two-shaft 4, a first-gear driven gear 41, a second-gear driven gear 43, a gear hub 42, a gear shifting transmission piece 45 and a two-shaft normally-closed gear 44, wherein a first hydraulic cylinder 81 and a second hydraulic cylinder 82 are oppositely arranged at two sides of the shell 1, a fork shaft 85 is in sliding connection with the shell 1 and parallel to the two-shaft 4, a fork 86 is arranged in the shell 1, one end of the fork 86 is fixedly connected with the fork shaft 85, the other end of the fork 86 is provided with a first limit groove and a second limit groove for the gear shifting transmission piece 45 to rotate, the first limit groove and the second limit groove are arranged in parallel, two ends of the gear shifting transmission piece 45 are respectively partially embedded into the first limit groove and the second limit groove, the gear shifting transmission piece 45 can rotate in the first limit groove and the second limit groove, the connection of the fork 86 and a meshing sleeve or a sliding gear is in 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 three shaft 5 and a three shaft normal gear 51, the first shaft 3 is a gearbox input shaft, the two shafts 4 are transmission shafts, the three shaft 5 is a power output shaft, the first shaft 3, the two shafts 4 and the three shaft 5 are arranged in parallel in the shell 1, two ends of the first shaft 3, the two shafts 4 and the three shaft 5 are rotationally 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 gearbox, 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 32 are coaxially and fixedly connected with the first shaft 3, the first gear driving gear 31 and the second gear driving gear 32 can be connected with the first shaft 3 through splines, the first gear driving gear 31 and the second gear driving gear 32 may also be rigidly connected, preferably by spline connection, to the first shaft 3, 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 gear 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 the first gear, the neutral gear and the 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 gear constant gear 44 is coaxially and fixedly connected, preferably rigidly connected, the three-shaft constant gear 51 is coaxially and fixedly connected, preferably rigidly connected, to the three-shaft 5, the first gear driven gear 41 is meshed with the first gear driving gear 31, the second gear driven gear 43 is meshed with the second gear driving gear 32, the second gear constant gear 44 is meshed with the three-shaft constant gear 51, the hydraulic gear shifting system is fixedly connected with the housing 1, the shifting transmission member 45 is meshed with the gear hub 42, and the end portion of the first gear driven gear 41 and the second gear driven gear 43 near the gear hub 42 is provided with a gear shifting member 45 which is matched with the gear 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 gear hub 42, or to disconnect the first-gear driven gear 41 and the second-gear driven gear 43 from the gear hub 42.
The shifting fork 86 is used for pushing the gear shifting transmission member 45 to axially reciprocate along the two shafts 4 so that the gear shifting transmission member 45 is only meshed with the gear hub 42 and is in neutral gear at the moment; or the gear shifting transmission member 45 is simultaneously meshed with the gear hub 42 and the engaging teeth 46 of the first-gear driven gear 41, which is the first gear at this time; or the shift transmission 45 is simultaneously engaged with the hub 42 and the engaging teeth 46 of the second-gear driven gear 43, which is the second gear.
The oil outlet end of the hydraulic oil tank is provided with a hydraulic pump, the oil outlet end of the hydraulic oil tank is communicated with the oil inlet end of the hydraulic pump, the oil inlet ends of the first oil cavity 815, the second oil cavity 825 and the hydraulic motor 2 are communicated with the oil outlet end of the hydraulic pump through pipelines, a first valve is arranged on a pipeline between the first oil cavity 815 and the hydraulic pump, a second valve is arranged on a pipeline between the second oil cavity 825 and the hydraulic pump, and a third valve is arranged on a pipeline between the oil inlet end of the hydraulic motor 2 and the hydraulic pump.
When the hydraulic motor 2 outputs power, the first shaft 3 is driven to rotate, the first shaft 3 drives the first gear driving gear 31 and the second gear driving gear 32 which are arranged on the first shaft 3 to rotate, the first gear driving gear 31 and the second gear driving gear 32 respectively transmit power to the first gear driven gear 41 and the second gear driven gear 43, when the first gear driving gear and the second gear driving gear are in a neutral state, the gear shifting transmission member 45 is only meshed with the gear hub 42, because the first gear driven gear 41 and the second gear driven gear 43 are idle gears, when the gear shifting transmission member 45 is not meshed with the first gear driven gear 41 or the second gear driven gear 43, the second shaft 4 has no power input, 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, the fork shaft 85 is pushed to move, the fork shaft 85 moves to drive the fork 86 to move, the fork 86 pushes the shift transmission member 45 to move, when the shift transmission member 45 is simultaneously meshed with the first-gear driven gear 41 and the gear hub 42, the first-gear shift is completed, the first valve and the second valve are closed after the shift is completed, the third valve is opened, the power of the first-gear driven gear 41 is transmitted to the gear hub 42 through the shift transmission member 45, the gear hub 42 is connected with the two shafts 4 through splines, the gear hub 42 drives the two shafts 4 to rotate, and the power is transmitted to the three shafts 5 through the two-shaft normally-engaged gear 44 and the three-shaft normally-engaged gear 51 and is output according to the speed of the first gear; when the gear shifting transmission piece 45 is meshed with the second-gear driven gear 43 and the gear hub 42 at the same time, the second-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 second-gear driven gear 43 is transmitted to the gear hub 42 through the gear shifting transmission piece 45, the gear hub 42 drives the two shafts 4 to rotate, and the power is transmitted to the three shafts 5 through the two-shaft normally-engaged gear 44 and the three-shaft normally-engaged gear 51 and is output according to the speed of the second gear, so that the operation is simple, the maintenance is convenient, the reliability is high, the direct gear shifting without gear selecting process is realized, the gear shifting time is shortened, the power loss in the gear shifting process is reduced, and the power performance, the fuel economy and the driving comfort are improved
As a further scheme of this embodiment, still include the controller, first valve, second valve and third valve are the solenoid valve, and first valve, second valve, third valve and hydraulic pump all are connected with the controller electricity and all are controlled by the controller, and the controller has control panel, is provided with the rocker switch on the control panel, and the rocker switch is equipped with neutral, first gear and three gear positions of second gear, sends the signal through the rocker switch and controls the controller, and the controller can select singlechip or PLC.
When the rocker switch is from neutral gear to first gear or from second gear to neutral gear or from second gear to first gear, the first valve is closed, the second valve is opened, hydraulic oil enters the second oil cavity 825, the shifting fork 86 is pushed to drive the gear shifting transmission piece 45 to move towards the first gear driven gear 41, and the second valve is closed until gear shifting is completed.
When the rocker switch is from neutral gear to second gear or from first gear to neutral gear or from first gear to second gear, the second valve is closed, the first valve is opened, hydraulic oil enters the first oil cavity 815, the shifting fork 86 is pushed to drive the cheering driving member to move towards the direction of the second gear driven gear, and the first valve is closed until gear shifting is completed.
As a further aspect of this embodiment, the present invention further includes a gear sensor in data communication with the controller, the gear sensor being configured to determine a position of the shift fork 86 when a shift of a different gear is completed, the gear sensor being disposed in the gearbox as in the prior art.
As a further scheme of this 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 is provided with a first piston oil passage, and the second piston assembly 84 is provided with a second piston oil passage.
When the second gear is engaged, the first piston assembly 83 pushes the fork shaft 85 to the first gear shifting position, the gear shifting transmission piece 45 is in contact with the end part of the combining tooth 46 of the second gear driven gear 43, and the first oil cavity 815 is communicated with the first motor connecting port 812 through a first piston oil duct;
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 is in contact with the end of the engaging tooth 46 of the first-gear driven gear 41, and the second oil chamber 825 is communicated with the second motor connecting port 822 through the second piston oil passage;
hydraulic oil that enters 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.
When the hydraulic motor 2 provides power and shifts gears, the hydraulic motor 2 stops power input, before the gear shifting is completed, part of hydraulic oil flows into the hydraulic motor 2 through the first motor connecting port 812 or the second motor connecting port 822, the hydraulic motor 2 is driven to drive the input shaft of the gearbox to rotate by a certain angle, the first-gear driven gear 41 and the second-gear driven gear 43 are driven to rotate by a certain angle, the gear shifting transmission piece 45 is convenient to cut in smoothly, the phenomenon that the gear shifting transmission piece 45 and a transmission tooth needing to cut in are in a tooth-to-tooth mode is avoided in the moving process of the gear shifting transmission piece 45, meshing cannot be completed, and the phenomenon that the gear is not up-shifted is avoided.
Specifically, the first piston assembly 83 includes a first piston 832 and a first valve element 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 has a first valve element mounting hole penetrating through both ends of a moving direction thereof, the first valve element 831 is disposed in the first valve element mounting hole in a penetrating manner, the first piston 832 has a first piston assembly hole, the first valve element 831 has a first valve element groove 8311, when the fork shaft 85 is located at the first shift position, the shift transmission member 45 contacts with an end portion of the engaging tooth 46 of the second-gear driven gear 43, the first piston assembly hole communicates with the first motor connection port 812 and the first valve element groove 8311 communicates with the first oil cavity 815, and the first valve element groove 8311 communicates 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 spool 841, the second piston 842 being slidably disposed within the second hydraulic cylinder 82 and dividing the interior of the second hydraulic cylinder 82 into a second oil chamber 825 and a second spool chamber 826, the second piston 842 having a second spool mounting hole extending through both ends of the direction of movement thereof, the second spool 841 being disposed through the second spool mounting hole, the second piston 842 having a second piston assembly hole, the second spool 841 having a second spool groove 8411, the spool 85 being in a second shift position, the shift transmission 45 being in contact with an end of the engaging tooth 46 of the first-gear driven gear 41, the second piston assembly hole being in communication with the second motor connecting port 822 and the second spool groove 8411 being in communication with the second oil chamber 825, the second spool groove 8411 being in communication with the second piston assembly hole to form a second piston oil passage.
Before the gear shifting transmission piece 45 reaches the gear shifting position, hydraulic oil does not enter the hydraulic motor 2, the first piston oil passage and the second piston oil passage are blocked, hydraulic oil leakage in the first oil cavity 815 and the second oil cavity 825 is reduced, enough thrust is kept in the first oil cavity 815 or the second oil cavity 825 to push the fork shaft 85 and the fork 86 to move, and when the fork 86 drives the gear shifting transmission piece 45 to reach the gear shifting position, the first piston oil passage or the second piston oil passage is communicated with the hydraulic motor 2, so that hydraulic oil enters the hydraulic motor 2 and drives the input shaft of the gearbox to rotate, and the first-gear driven gear 41 and the second-gear driven gear 43 rotate by a certain angle.
As a further aspect of this embodiment, the present invention further includes a first guiding and positioning sleeve 881 and a second guiding and positioning sleeve 882, 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 spool 831 is slidably disposed in the first valve spool mounting hole, and the second valve spool 841 is slidably disposed in the second valve spool mounting hole;
when the second gear is engaged, the fork shaft 85 is positioned at a first gear shifting position, the end part of the first piston 832 is abutted with the first guiding and positioning sleeve 881, the first valve core 831 continuously pushes the fork shaft 85 to move so that the gear shifting transmission piece 45 finishes gear shifting, and the first valve core groove 8311 is disconnected with the first oil cavity 815;
When a first gear is engaged, the fork shaft 85 is located at a second gear shifting position, the end portion of the second piston 842 is abutted against the second guiding and positioning sleeve 882, the second valve core 841 continues to push the fork shaft 85 to move so that the gear shifting transmission member 45 is shifted, and the second valve core groove 8411 is disconnected from the second oil cavity 825.
When the first piston 832 moves to be in contact with the first guide positioning sleeve 881, the first piston oil duct is communicated with the first oil cavity 815 and the first motor connecting port 812, the first valve element 831 continues to move to finish gear shifting, and after the first valve element 831 moves, the first valve element groove 8311 is disconnected from the first oil cavity 815 and no oil is fed into the hydraulic motor 2; or the second valve element 841 slides in the second piston 842, when the second piston 842 moves to be in contact with the second guiding positioning sleeve 882, the second piston oil duct communicates the second oil cavity 825 with the second motor connecting port 822, the second valve element 841 continues to move to finish gear shifting, and after the second valve element 841 moves, the second valve element groove 8411 is disconnected from the second oil cavity 825, and no oil is fed into the hydraulic motor 2.
As a further solution of this embodiment, 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 both communicated with the hydraulic oil tank, a first gap is provided between the first valve element 831 and the first piston 832, a second gap is provided between the second valve element 841 and the second piston 842, a third gap and a fourth gap are provided between the fork shaft 85 and the first guiding and positioning sleeve 881 and the second guiding and positioning sleeve 882, the first guiding and positioning sleeve 881 is provided with a first positioning sleeve oil return hole 8811 communicated with the first oil return hole 813, the second guiding and 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 882 through the fourth gap.
As a further solution of this embodiment, both ends of the first spool 831 and the second spool 841 are sleeved with a wire retainer ring 89, and the wire retainer ring 89 is used for limiting the first spool 831 or the second spool 841 connected with the wire retainer ring. Specifically, annular retainer grooves are machined on the outer walls of the two ends of the first valve element 831 and the second valve element 841, and steel wire retainer rings 89 are embedded in the retainer grooves in a one-to-one correspondence mode.
Specifically, the first positioning sleeve oil return hole 8811 is disposed along the radial direction of the first guiding positioning sleeve 881, one end of which is communicated with the first positioning sleeve oil return hole 8811, and the other end of which is communicated with the third gap. The outer side of the first guide positioning sleeve 881 corresponding to one end of the first positioning sleeve oil return hole 8811 is also provided with an annular first oil return groove which is communicated with one end of the first positioning sleeve oil return hole 8811; the second locating sleeve oil return hole 8821 is disposed along the radial direction of the second guiding locating sleeve 882, one end of the second locating sleeve oil return hole 8821 is communicated with the second locating sleeve oil return hole 8821, the other end of the second guiding locating sleeve 882 is communicated with the fourth gap, the outer side of the second guiding locating sleeve 882 corresponding to one end of the second locating sleeve oil return hole 8821 is also provided with an annular second oil return groove, and the second oil return groove is communicated with one end of the second locating sleeve oil return hole 8821.
As a further scheme of this embodiment, the inner side of one end of the first guiding and positioning sleeve 881 and the second guiding and positioning sleeve 882, which is close to the inner cavity of the housing 1, is provided with a positioning sleeve inner sealing groove, and the inner sealing grooves of the positioning sleeves of the first guiding and positioning sleeve 881 and the second guiding and positioning sleeve 882 are embedded with the fork shaft sealing ring.
As a further scheme of the embodiment, the hydraulic oil pump further comprises a first adjusting bolt 814 and a second adjusting bolt 824, wherein one end of the first hydraulic oil cylinder 81 is provided with a first adjusting threaded hole 817 coaxially arranged 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 of the first adjusting bolt 814 extends into the first oil cavity 815; one end of the second hydraulic cylinder 82 has a second adjustment threaded hole 827 coaxially disposed with the second piston assembly 84, the second adjustment bolt 824 is threadedly coupled to the second adjustment threaded hole 827, and one end thereof extends into the second oil chamber 825, and the first adjustment bolt 814 and the second adjustment bolt 824 can limit the position of the fork shaft 85 to move to both sides.
As a further scheme of the embodiment, the hydraulic oil cylinder further comprises a first sealing nut and a second sealing nut, wherein the first sealing nut and the first adjusting threaded hole 817 are coaxially arranged and fixedly connected to the outer side of the first hydraulic oil cylinder 81, and the first adjusting bolt 814 is in threaded connection with the first sealing nut; the second seal nut is coaxially disposed with the second adjustment threaded hole 827 and fixedly coupled to the outer side of the second hydraulic ram 82, and the second adjustment bolt 824 is threadedly coupled to the second seal nut.
As a further solution of this embodiment, the piston sealing device further includes a first sealing ring, the outer walls of the first piston 832 and the second piston 842 have 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 rings are embedded in the piston sealing grooves of the first piston 832 and the second piston 842, and the first sealing rings seal the 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 the embodiment, the hydraulic cylinder further comprises a second sealing ring, cylinder body sealing grooves are formed in the opening edges of the first hydraulic cylinder 81 and the second hydraulic cylinder 82, which are close to the inner cavity of the shell 1, 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 a further scheme of this embodiment, the outer side walls of the first guiding locating sleeve 881 and the second guiding locating sleeve 882, which are close to one end of the inner cavity of the housing 1, are respectively provided with a locating sleeve outer sealing groove, and the locating sleeve outer sealing grooves of the first guiding locating sleeve 881 and the second guiding locating sleeve 882 are respectively embedded with a third sealing ring.
As a further scheme of this embodiment, still include locking ball 87, the upside outer wall of fork shaft 85 has opened first locking hole, second locking hole and third locking hole along the axial in proper order, casing 1 and fork shaft 85 sliding connection part separate have the locking passageway that supplies locking ball 87 to remove, locking passageway upper end seals and lower extreme opening, the locking passageway is vertical, locking ball 87 elasticity spacing is in the locking passageway, the locking ball 87 top is provided with hold-down spring, hold-down 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 shaft 85 in corresponding position auto-lock, prevent that it from moving by oneself along the axial, specifically:
When a second gear is engaged, the gear shifting transmission piece 45 is simultaneously meshed with the gear hub 42 and the combining 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 gear is engaged in the neutral gear, 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 a first gear is engaged, the gear shifting transmission member 45 is simultaneously meshed with the gear hub 42 and the combining 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 shift is completed, the lower portion of the locking ball 87 is inserted into the corresponding locking hole and cooperates with the locking passage to prevent the shift rail 85 from moving, and to keep the shift transmission member 45 engaged with the corresponding transmission gear, thereby preventing the shift rail 85 from moving at will in the non-shift state.
As a further scheme of the present embodiment, the differential mechanism 6 and the three-shaft final drive gear 52 are further included, the three-shaft final drive gear 52 is disposed on the three shaft 5 and is fixedly connected with the three shaft 5 coaxially, the three-shaft final drive gear 52 is meshed with the input gear 61 of the differential mechanism, and the power input by the motor is output through the differential mechanism 6 via the three shaft 5.
As a further solution of the present embodiment, 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 to 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 at one end of the triaxial 5 on the housing 1, the third brake 73 is used for braking the triaxial 5, the third brake 73 is a hand brake, and the method of connecting the brake with the housing 1 for braking the spindle is the prior art.
The invention discloses a control method of a control system of an electrohydraulic control gearbox, which comprises the following steps: by adopting the control system of the electrohydraulic control gearbox,
when shifting to the direction of the second hydraulic cylinder 82, the first valve is opened, the second valve is closed, hydraulic oil enters the first hydraulic cylinder 81 to push the first piston assembly 83, 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, so that the gear shifting transmission piece 45 is meshed with corresponding transmission teeth, and gear shifting to the direction of the second hydraulic cylinder 82 is realized;
When shifting to the direction of the first hydraulic cylinder 81, the second valve is opened, the first valve is closed, hydraulic oil enters the second hydraulic cylinder 82 to push the second piston assembly 84, the second piston assembly 84 pushes the fork shaft 85 to drive the shifting fork 86 to move towards the direction of the first hydraulic cylinder 81, so that the gear shifting transmission piece 45 is meshed with the corresponding transmission teeth, and gear shifting to the direction of the first hydraulic cylinder 81 is realized.
Of course, the present invention is capable of other various embodiments and its several details are capable of modification and variation in light of the present invention by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (7)

1. A control system for an electrohydraulic control gearbox, characterized by: 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 oppositely arranged, the first piston assembly (83) is slidably arranged in the first hydraulic oil cylinder (81) 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 slidably arranged in the second hydraulic oil cylinder (82) 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 slidably arranged in the first fork shaft cavity (816) and the second fork shaft cavity (826) respectively and are abutted against the first piston assembly (83) and the second piston assembly (84), the first oil cavity (815) and the second oil cavity (815) are respectively communicated with the hydraulic oil tank (825) through a valve pipeline and the hydraulic oil tank on the upper end of the second oil tank (825), the hydraulic oil tank supplies power to the first oil chamber (815) or the second oil chamber (825);
The control system further comprises a hydraulic motor (2) and a third valve, wherein the output end of the hydraulic motor (2) is in transmission connection with the input end of the gearbox, the oil outlet end of the hydraulic oil tank is communicated with the oil inlet end of the hydraulic motor (2) through a pipeline, the oil outlet end of the hydraulic motor (2) is communicated with the hydraulic oil tank through a pipeline, the 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, the hydraulic oil tank supplies energy to the hydraulic motor (2), and the hydraulic motor (2) is used for inputting power to the gearbox;
a first motor connecting port (812) is formed in the middle of the first hydraulic oil cylinder (81), a second motor connecting port (822) is formed in the middle of the second hydraulic oil cylinder (82), the first motor connecting port (812) and the second motor connecting port (822) are communicated with the oil inlet end of the hydraulic motor (2), the first piston assembly (83) is provided with a first piston oil duct, and the second piston assembly (84) is provided with a second piston oil duct;
when the first piston assembly (83) pushes the fork shaft (85) to a first gear shifting position, the first oil cavity (815) is communicated with the first motor connection port (812) through the first piston oil duct;
When the second piston assembly (84) pushes the fork shaft (85) to a second gear shifting position, the second oil cavity (825) is communicated with the second motor connecting port (822) through the second piston oil duct;
hydraulic oil entering the hydraulic motor (2) through the first motor connection port (812) and the second motor connection port (822) is used for driving the hydraulic motor (2);
the first piston assembly (83) comprises a first piston (832) and a first valve core (831), the first piston (832) is slidably arranged in the first hydraulic oil cylinder (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) is provided with a first valve core mounting hole penetrating through two ends of the first piston assembly, the first valve core (831) is penetrated in the first valve core mounting hole, 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 positioned at a first gear shifting position, the first piston assembly hole is communicated with the first motor connecting port (812) and 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 the first piston oil duct;
The second piston assembly (84) comprises a second piston (842) and a second valve core (841), the second piston (842) is slidably arranged in the second hydraulic oil cylinder (82) and divides the inner cavity of the second hydraulic oil cylinder (82) into a second oil cavity (825) and a second branch shaft cavity (826), the second piston (842) is provided with a second valve core mounting hole penetrating through two ends of the second piston assembly, the second valve core (841) is penetrated in the second valve core mounting hole, the second piston (842) is provided with a second piston assembly hole, the second valve core (841) is provided with a second valve core groove (8411), when the branch shaft (85) is positioned at a second gear shifting position, 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 the second oil duct;
the shifting fork is fixedly connected with the fork shaft and is used for pushing the shifting transmission piece to move so that the shifting transmission piece is meshed with transmission teeth of different gears to realize shifting.
2. The control system of an electro-hydraulically controlled gearbox of claim 1, wherein: the hydraulic control valve further comprises 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 slidably arranged in the first guide positioning sleeve (881) and the second guide positioning sleeve (882), the first valve core (831) is slidably arranged in the first valve core mounting hole, and the second valve core (841) is slidably arranged in the second valve core mounting hole;
When the fork shaft (85) is positioned at a first gear shifting position, the end part of the first piston (832) is abutted with the first guiding and positioning sleeve (881), the first valve core (831) continuously pushes the fork shaft (85) to move so that the gear shifting transmission piece (45) finishes gear shifting, and the first valve core groove (8311) is disconnected with the first oil cavity (815);
when the fork shaft (85) is positioned at a second gear shifting position, the end part of the second piston (842) is abutted with the second guiding positioning sleeve (882), the second valve core (841) continuously pushes the fork shaft (85) to move so that the gear shifting transmission piece (45) finishes gear shifting, and the second valve core groove (8411) is disconnected from the second oil cavity (825).
3. The control system of an electro-hydraulically controlled gearbox of claim 2, wherein: the hydraulic oil cylinder is characterized in that a first oil return hole (813) and a second oil return hole (823) are formed in the first fork shaft cavity (816) and the second fork shaft cavity (826) respectively, 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 formed between the fork shaft (85) and the first guide positioning sleeve (881) and the second guide positioning sleeve (882) respectively, 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), and the first positioning sleeve (881) is communicated with the second oil return hole (882) through the third gap and the fourth gap.
4. The control system of an electro-hydraulically controlled gearbox of claim 1, wherein: and two ends of the first valve core (831) and the second valve core (841) are respectively sleeved with a steel wire check ring (89), and the steel wire check rings (89) are used for limiting the first valve core (831) or the second valve core (841) connected with the steel wire check rings.
5. A control system for an electro-hydraulically controlled gearbox according to any of claims 1-4, characterized in that: the valve further comprises a controller, 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 controlled by the controller.
6. The control system for an electro-hydraulically controlled gearbox of claim 5, wherein: the shift control system further comprises a gear sensor in data communication with the controller, the gear sensor being used to determine the position of the fork shaft (85) when a shift of different gears is completed.
7. A control method of a control system of an electrohydraulic control gearbox comprises the following steps: the method is characterized in that: a control system employing an electrohydraulic control gearbox as claimed in any one of claims 1 to 6,
when shifting to the direction of the second hydraulic oil cylinder (82), the first valve is opened, the second valve is closed, hydraulic oil in the hydraulic oil tank enters the first hydraulic oil cylinder (81), the first piston assembly (83) is pushed, and the first piston assembly (83) pushes the fork shaft (85) to move towards the direction of the second hydraulic oil cylinder (82) so as to realize shifting towards the direction of the second hydraulic oil cylinder (82);
When shifting to the direction of the first hydraulic oil cylinder (81), the second valve is opened, the first valve is closed, hydraulic oil in the hydraulic oil tank enters the second hydraulic oil cylinder (82), the second piston assembly (84) is pushed, and the second piston assembly (84) pushes the fork shaft (85) to move towards the direction of the first hydraulic oil cylinder (81), so that shifting towards the direction of the first hydraulic oil cylinder (81) is realized.
CN201910832707.1A 2019-09-04 2019-09-04 Control system and control method for electrohydraulic control gearbox Active CN110425264B (en)

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