CN114909358A - Gear interlocking system and method for electro-hydraulic gear shifting of tractor transmission - Google Patents

Gear interlocking system and method for electro-hydraulic gear shifting of tractor transmission Download PDF

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Publication number
CN114909358A
CN114909358A CN202210749877.5A CN202210749877A CN114909358A CN 114909358 A CN114909358 A CN 114909358A CN 202210749877 A CN202210749877 A CN 202210749877A CN 114909358 A CN114909358 A CN 114909358A
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China
Prior art keywords
gear
oil
valve
way
communicated
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CN202210749877.5A
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Chinese (zh)
Inventor
夏光
施展
刘贤阳
魏志祥
张晨昊
周大洋
李涛
汪韶杰
孙保群
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Hefei University of Technology
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Hefei University of Technology
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Priority to CN202210749877.5A priority Critical patent/CN114909358A/en
Publication of CN114909358A publication Critical patent/CN114909358A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/027—Check valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
    • 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
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/30505—Non-return valves, i.e. check valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/31—Directional control characterised by the positions of the valve element
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/80—Other types of control related to particular problems or conditions
    • F15B2211/895—Manual override
    • 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
    • F16H2306/00—Shifting

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Gear-Shifting Mechanisms (AREA)
  • Control Of Transmission Device (AREA)

Abstract

The invention discloses a gear interlocking system and a gear interlocking method for electro-hydraulic gear shifting of a tractor transmission, which realize the interlocking function between gears and the function of accurately controlling the gear engaging operation through the on-off of a two-position three-way reversing valve, the on-off of a three-position four-way manual control mechanical valve and the on-off of the three-position four-way reversing valve. The invention can realize the interlocking control of the gear shift mechanism on the conditions of frequent gear shift and gear shift operation, thereby reducing the abrasion of the gear shift mechanism and improving the safety of a driver during operation.

Description

Gear interlocking system and method for electro-hydraulic gear shifting of tractor transmission
Technical Field
The invention belongs to the field of agricultural machinery, and relates to a safety control system for gear shifting interlocking operation.
Background
The tractor is one of the most common engineering vehicles in agricultural machinery and is widely applied to agricultural engineering. With the development of agricultural modernization, tractors play an increasingly important role in the agricultural practical application process, so that the working life and the maintenance requirements of the tractors are gradually increased, wherein the interlocking function of the tractors in the gear shifting operation process is not perfect, and the mutual interference phenomenon possibly occurs between gears in the gear shifting process of the tractors, so that the gear shifting gears are abraded, the intermittent working life is prolonged, even the gear engagement error occurs, the running safety of the tractors is influenced, and the potential safety hazard is generated.
Disclosure of Invention
In order to avoid the problems, the invention provides a gear interlocking system and a gear interlocking method for electro-hydraulic gear shifting of a tractor transmission, which aim to change a hydraulic oil circuit route, realize the interlocking function between gears of the tractor under the conditions of frequent gear shifting and gear shifting operation, prevent the occurrence of motion interference, reduce the abrasion of a gear shifting mechanism and ensure the safety during driving.
The invention adopts the following technical scheme for solving the technical problems:
the invention relates to a gear interlocking system for electro-hydraulic gear shifting of a tractor transmission, which is characterized by comprising the following components: the hydraulic control system comprises an oil tank, an oil pump, a two-position three-way reversing valve, an 1/2 gear oil way one-way valve, a 3/4 gear oil way one-way valve, a 1/2 gear manual control mechanical valve, a 3/4 gear manual control mechanical valve, a 1/2 gear three-position four-way reversing valve, a 3/4 gear three-position four-way reversing valve, a 1 gear electromagnetic valve, a 2 gear electromagnetic valve, a 3 gear electromagnetic valve, a 4 gear electromagnetic valve, an 1/2 gear shift oil cylinder and a 3/4 gear shift oil cylinder;
the oil tank supplies oil to the 1/2 gear shift oil cylinder and the 3/4 gear shift oil cylinder through oil pumps respectively;
when the two-position three-way reversing valve is in a left position, a lower oil cavity of the two-position three-way reversing valve is communicated with an oil outlet of an oil pump, an upper right oil cavity of the two-position three-way reversing valve is communicated with an oil inlet of the 1/2-gear oil way one-way valve, and an upper left oil cavity of the two-position three-way reversing valve is communicated with the oil tank;
when the two-position three-way reversing valve is in the right position, the lower oil cavity of the two-position three-way reversing valve is communicated with an oil outlet of an oil pump, the upper left oil cavity of the two-position three-way reversing valve is communicated with an oil inlet of the 3/4-gear oil way one-way valve, and the upper right oil cavity of the two-position three-way reversing valve is communicated with the oil tank;
when the 1/2-gear manual control mechanical valve is controlled by the shifting fork to be in the left position or the right position, the oil cavity of the manual control mechanical valve is in a cut-off state;
when the 1/2-gear manual control mechanical valve is in a middle position under the control of a shifting fork, an upper left oil cavity of the 1/2-gear manual control mechanical valve is connected with a lower left oil cavity of the 1/2-gear three-position four-way reversing valve, an upper right oil cavity of the 1/2-gear manual control mechanical valve is respectively connected with a lower right oil cavity of the 1/2-gear three-position four-way reversing valve and a lower left oil cavity of the 3/4-gear manual control mechanical valve, a lower left oil cavity of the 1/2-gear manual control mechanical valve is communicated with the oil tank, and a lower right oil cavity of the 1/2-gear manual control mechanical valve is connected with an oil outlet of the 1/2-gear oil way one-way valve;
an upper left oil cavity of the 1/2-gear three-position four-way reversing valve is communicated with a lower oil cavity of the 1-gear electromagnetic valve, and an upper right oil cavity of the 1/2-gear three-position four-way reversing valve is communicated with a lower oil cavity of the 2-gear electromagnetic valve;
when the 3/4-gear manual control mechanical valve is controlled by the shifting fork to be in the left position or the right position, the oil cavity of the manual control mechanical valve is in a cut-off state;
when the 3/4-gear manual control mechanical valve is in a middle position under the control of a shifting fork, an upper left oil cavity of the 3/4-gear manual control mechanical valve is respectively connected with a lower left oil cavity of the 3/4-gear three-position four-way reversing valve and a lower right oil cavity of the 1/2-gear manual control mechanical valve, an upper right oil cavity of the 3/4-gear manual control mechanical valve is connected with a lower right oil cavity of the 3/4-gear three-position four-way reversing valve, and a lower left oil cavity of the 3/4-gear manual control mechanical valve is connected with an oil outlet of the 3/4-gear oil-way one-way valve; the lower right oil chamber of the 3/4-gear manual control mechanical valve is communicated with the oil tank;
an upper left oil cavity of the 3/4-gear three-position four-way reversing valve is communicated with a lower oil cavity of the 3-gear electromagnetic valve, and an upper right oil cavity of the 3/4-gear three-position four-way reversing valve is communicated with a lower oil cavity of the 4-gear electromagnetic valve;
the 1/2-gear manual control mechanical valve and the 1/2-gear three-position four-way reversing valve are controlled by a gear shifting fork led out by a piston of the 1/2-gear shifting oil cylinder;
the 3/4-gear manual control mechanical valve and the 3/4-gear three-position four-way reversing valve are controlled by a gear shifting fork led out from a piston of the 3/4-gear shifting oil cylinder;
an upper left oil cavity of the 1-gear electromagnetic valve is communicated with the oil tank, and an upper right oil cavity of the 1-gear electromagnetic valve is communicated with a rodless cavity of the 1/2-gear shift oil cylinder;
an upper left oil cavity of the 2-gear electromagnetic valve is communicated with a rod cavity of the 1/2-gear shift oil cylinder, and an upper right oil cavity of the 2-gear electromagnetic valve is communicated with the oil tank;
an upper left oil cavity of the 3-gear electromagnetic valve is communicated with the oil tank, and an upper right oil cavity of the 3-gear electromagnetic valve is communicated with a rod cavity of the 3/4-gear shifting oil cylinder;
an upper left oil cavity of the 4-gear electromagnetic valve is communicated with a rodless cavity of the 3/4-gear shifting oil cylinder, and an upper right oil cavity of the 4-gear electromagnetic valve is communicated with the oil tank.
The invention relates to a gear interlocking method for electro-hydraulic gear shifting of a tractor transmission, which is characterized in that the method is based on a gear interlocking system and is carried out according to the following processes:
step 1.1, if a gear 1/2 is engaged; step 1.2 is executed; otherwise, indicating that 3/4 gear is engaged, and executing step 1.5;
1.2, switching the two-position three-way reversing valve to an 3/4 gear oil way;
step 1.3, judging whether a gear shifting fork of an 3/4 gear oil way is in a middle position, if so, indicating that a 3/4 gear oil way is communicated to an oil way to which a gear needs to be engaged, so that interlocking is realized between a 1/2 gear oil way and a 3/4 gear oil way; otherwise, executing step 1.4;
step 1.4, manually operating the manual control mechanical valve at the 3/4 gear position by using a gear shifting fork, adjusting the oil circuit at the 3/4 gear position to a middle position, and returning to the step 1.3;
step 1.5, switching the two-position three-way reversing valve to an 1/2 gear oil way;
step 1.6, judging whether a gear shifting fork of an 1/2 gear oil way is in a middle position, if so, indicating that a 1/2 gear oil way is communicated to an oil way to which a gear to be engaged belongs, so that interlocking is realized between a 3/4 gear oil way and a 1/2 gear oil way; otherwise, executing step 1.7;
and step 1.7, manually operating the manual control mechanical valve at the 1/2 gear position by using a gear shifting fork, adjusting the oil circuit at the 1/2 gear position to a middle position, and returning to the step 1.6.
Compared with the prior art, the invention has the beneficial effects that:
1. on the basis of the original tractor gear-shifting hydraulic oil circuit, a two-position three-way reversing valve is added at the front section of the gear oil circuit, so that the automatic switching of hydraulic oil of the gear-shifting oil circuit is realized, and the safety premise of gear interlocking is provided;
2. according to the invention, the manual mechanical valves controlled by the gear shifting fork are respectively added on the oil paths of the 1/2 gear and the 3/4 gear, so that the oil path of the other gear is always in a middle position in the gear shifting process, the gear shifting interference cannot occur in the gear shifting process, the gear shifting gear is prevented from being abraded, and the gear interlocking function in the gear shifting process is realized;
3. according to the invention, one-way valve is additionally arranged between the three-position four-way reversing valve and the two gear oil way manual control mechanical valves respectively, so that oil backflow in the process of switching oil ways of hydraulic oil is prevented, and the safety of the oil ways is protected.
Drawings
FIG. 1 is a schematic view of a tractor gear interlock system of the present invention;
FIG. 2 is a schematic representation of the tractor drive train shift mechanism of the present invention;
FIG. 3 is a schematic diagram of the tractor gear interlock system of the present invention;
FIG. 4 is a flow chart of a tractor gear interlock method of the present invention;
reference numbers in the figures: 1-an oil tank; 2-an oil pump; 3-a three-position four-way reversing valve; 4-1/2 gear oil way check valve; 5-3/4 gear oil way check valve; 6-1/2 gear oil-way manual mechanical valve; 7-3/4 gear oil-way manual mechanical valve; 8-1/2 gear three-position four-way reversing valve; 9-3/4 gear three-position four-way reversing valve; 10-1 gear electromagnetic valve; an 11-2 gear electromagnetic valve; a 12-3 gear electromagnetic valve; a 13-4 gear electromagnetic valve; 14-1/2 gear shift cylinders; 15-3/4 gear shift oil cylinders; 16-tractor body.
Detailed Description
In the present embodiment, as shown in fig. 1, a gear interlock system for a gear shift operation of a tractor includes: an oil tank 1; an oil pump 2; a three-position four-way reversing valve 3; 1/2 gear oil way check valve 4; 3/4 gear oil way check valve 5; 1/2 gear oil-way manual mechanical valve 6; 3/4 gear oil-way manual mechanical valve 7; 1/2 gear three-position four-way reversing valve 8; 3/4 gear three-position four-way reversing valve 9; a 1-gear electromagnetic valve 10; a 2-gear electromagnetic valve 11; a 3-gear electromagnetic valve 12; a 4-gear electromagnetic valve 13; 1/2 shift position shift cylinder 14; 3/4 shift position shift cylinder 15; a tractor body 16;
the oil tank 1 supplies oil to the 1/2-gear shift cylinder 14 and the 3/4-gear shift cylinder 15 through the oil pump 2; wherein the 1/2 gear shifting oil cylinder 14 and the 3/4 gear shifting oil cylinder 15 are both hinged with the tractor body 16;
the oil circuit connection sequence leading to the gear shifting oil cylinder of 1/2 gears is respectively an oil tank 1, an oil pump 2, a two-position three-way reversing valve 3, a 3/4 gear oil circuit one-way valve 5, a 3/4 gear manual control mechanical valve 7, a 1/2 gear three-position four-way reversing valve 8, a 1 gear electromagnetic valve 10 or a 2 gear electromagnetic valve 11 and a 1/2 gear shifting oil cylinder 14; the manual control mechanical valve 7 at the 3/4 gear is kept at a middle position through manual operation, oil passes through the 1/2 gear three-position four-way reversing valve 8, the 1 gear is engaged when the 1/2 gear three-position four-way reversing valve 8 is at the left position, and the 2 gear is engaged when the right position is;
the oil circuit connection sequence leading to the gear shifting oil cylinder of 3/4 gears is respectively an oil tank 1, an oil pump 2, a two-position three-way reversing valve 3, a 1/2 gear oil circuit one-way valve 4, a 1/2 gear manual control mechanical valve 8, a 3/4 gear three-position four-way reversing valve 9, a 3 gear electromagnetic valve 12 or a 4 gear electromagnetic valve 13, and a 1/2 gear shifting oil cylinder 15; the 1/2-gear manual control mechanical valve 6 is kept at a middle position through manual operation, oil passes through the 3/4-gear three-position four-way reversing valve 9, the 3 gear is engaged when the 3/4-gear three-position four-way reversing valve 9 is in a left position, and the 4 gear is engaged when the right position is;
in this embodiment, as shown in fig. 2, the 1/2 shift fork is located between 1 and 2, and the shift fork is shifted up to engage in 1, and is shifted down to engage in 2; 3/4 a gear shifting fork is positioned between 3 and 4 points, and the fork is shifted upwards to be engaged in 3 gears and is shifted downwards to be engaged in 4 gears; in fig. 1, an 1/2-gear manual mechanical valve 6, a 1/2-gear three-position four-way reversing valve 8, a 3/4-gear manual mechanical valve 7 and a 3/4-gear three-position four-way reversing valve 9 are respectively controlled by a 1/2-gear shifting fork and a 3/4-gear shifting fork;
in this embodiment, as shown in fig. 3, the schematic diagram of the gear interlocking mechanism shown in fig. 1 is simplified into a flowchart, after an oil path is transmitted to a reversing valve through an oil tank oil pump, the oil path is kept at a neutral position through manual operation of a manual mechanical valve controlled by a shifting fork, the gear oil path reversing valve plays a role in shifting gears, and after an electromagnetic valve of each gear receives a gear shifting signal, gear shifting operation is performed to enable hydraulic oil to enter a gear shifting oil cylinder to realize gear interlocking and complete gear shifting operation;
in this embodiment, as shown in fig. 4, the working process of the gear interlock system is simplified into a flowchart, a current gear to be engaged is first determined, the two-position three-way directional valve switches the oil path to another gear, whether another gear is in the middle position at this time is determined, if so, the desired gear is directly engaged, otherwise, another gear is adjusted to the middle position through manual operation of the manual control mechanical valve, and then the desired gear is engaged, so that gear interlock is realized;
in this embodiment, a gear interlocking method of a tractor gear interlocking system includes the following steps:
step 1.1, if a gear 1/2 is engaged; then step 1.2 is executed; otherwise, indicating that 3/4 gear is engaged, and executing step 1.5;
step 1.2, switching the two-position three-way reversing valve 3 to an 3/4 gear oil way;
step 1.3, judging whether a gear shifting fork of an 3/4 gear oil way is in a middle position, if so, indicating that a 3/4 gear oil way is communicated to an oil way to which a gear needs to be engaged, so that interlocking is realized between a 1/2 gear oil way and a 3/4 gear oil way; otherwise, executing step 1.4;
step 1.4, manually operating the manual control mechanical valve 7 at the 3/4 gear by using a gear shifting fork, adjusting the oil circuit at the 3/4 gear to a middle position, and returning to the step 1.3;
step 1.5, switching the two-position three-way reversing valve (3) to an 1/2 gear oil way;
step 1.6, judging whether a gear shifting fork of an 1/2 gear oil way is in a middle position, if so, indicating that a 1/2 gear oil way is communicated to an oil way to which a gear to be engaged belongs, so that interlocking is realized between a 3/4 gear oil way and a 1/2 gear oil way; otherwise, executing step 1.7;
step 1.7, manually operating a manual control mechanical valve (6) with 1/2 gears by using a gear shifting fork, adjusting a 1/2 gear oil way to a middle position, and returning to the step 1.6;
in conclusion, the gear shifting system is improved, the interference problem in the gear shifting process of the tractor can be effectively solved, gear interlocking can be still ensured under the condition that the gear sensor fails, repeated operation of a driver is reduced, operation is more labor-saving, the fault tolerance of the gear shifting operation can be effectively improved, and the working efficiency is improved.

Claims (2)

1. A gear interlock system for electro-hydraulic shifting of a tractor transmission, comprising: the hydraulic control system comprises an oil tank (1), an oil pump (2), a two-position three-way reversing valve (3), an 1/2 gear oil way one-way valve (4), a 3/4 gear oil way one-way valve (5), a 1/2 gear manual mechanical valve (6), a 3/4 gear manual mechanical valve (7), a 1/2 gear three-position four-way reversing valve (8), a 3/4 gear three-position four-way reversing valve (9), a 1 gear electromagnetic valve (10), a 2 gear electromagnetic valve (11), a 3 gear electromagnetic valve (12), a 4 gear electromagnetic valve (13), an 1/2 gear shift oil cylinder (14) and a 3/4 gear shift oil cylinder (15);
the oil tank (1) supplies oil to the 1/2 gear shift oil cylinder (14) and the 3/4 gear shift oil cylinder (15) through an oil pump (2);
when the two-position three-way reversing valve (3) is in the left position, a lower oil cavity of the two-position three-way reversing valve is communicated with an oil outlet of the oil pump (2), an upper right oil cavity of the two-position three-way reversing valve (3) is communicated with an oil inlet of the 1/2-gear oil way one-way valve (4), and an upper left oil cavity of the two-position three-way reversing valve (3) is communicated with the oil tank (1);
when the two-position three-way reversing valve (3) is in the right position, a lower oil cavity of the two-position three-way reversing valve is communicated with an oil outlet of the oil pump (2), an upper left oil cavity of the two-position three-way reversing valve (3) is communicated with an oil inlet of the 3/4-gear oil way one-way valve (5), and an upper right oil cavity of the two-position three-way reversing valve (3) is communicated with the oil tank (1);
when the 1/2-gear manual control mechanical valve (6) is controlled by the shifting fork to be in the left position or the right position, oil cavities of the valve are in a stop state;
when the 1/2-gear manual control mechanical valve (6) is in a middle position under the control of a shifting fork, an upper left oil cavity of the 1/2-gear manual control mechanical valve (6) is connected with a lower left oil cavity of the 1/2-gear three-position four-way reversing valve (8), an upper right oil cavity of the 1/2-gear manual control mechanical valve (6) is respectively connected with a lower right oil cavity of the 1/2-gear three-position four-way reversing valve (8) and a lower left oil cavity of the 3/4-gear manual control mechanical valve (7), a lower left oil cavity of the 1/2-gear manual control mechanical valve (6) is communicated with the oil tank (1), and a lower right oil cavity of the 1/2-gear manual control mechanical valve (6) is connected with an oil outlet of the 1/2-gear oil way one-way valve (4);
an upper left oil cavity of the 1/2-gear three-position four-way reversing valve (8) is communicated with a lower oil cavity of the 1-gear electromagnetic valve (10), and an upper right oil cavity of the 1/2-gear three-position four-way reversing valve (8) is communicated with a lower oil cavity of the 2-gear electromagnetic valve (11);
when the 3/4-gear manual control mechanical valve (7) is controlled by the shifting fork to be in a left position or a right position, oil cavities of the valve are in a stop state;
when the 3/4-gear manual control mechanical valve (7) is in a middle position under the control of a shifting fork, an upper left oil cavity of the 3/4-gear manual control mechanical valve (7) is respectively connected with a lower left oil cavity of a 3/4-gear three-position four-way reversing valve (9) and a lower right oil cavity of a 1/2-gear manual control mechanical valve (6), an upper right oil cavity of the 3/4-gear manual control mechanical valve (7) is connected with a lower right oil cavity of a 3/4-gear three-position four-way reversing valve (9), and a lower left oil cavity of the 3/4-gear manual control mechanical valve (7) is connected with an oil outlet of a 3/4-gear oil way one-way valve (5); a lower right oil chamber of the 3/4-gear manual control mechanical valve (7) is communicated with the oil tank (1);
an upper left oil cavity of the 3/4-gear three-position four-way reversing valve (9) is communicated with a lower oil cavity of the 3-gear electromagnetic valve (12), and an upper right oil cavity of the 3/4-gear three-position four-way reversing valve (9) is communicated with a lower oil cavity of the 4-gear electromagnetic valve (13);
the 1/2-gear manual control mechanical valve (6) and the 1/2-gear three-position four-way reversing valve (8) are controlled by a gear shifting fork led out from a piston of the 1/2-gear shifting oil cylinder (14);
the 3/4-gear manual control mechanical valve (7) and the 3/4-gear three-position four-way reversing valve (9) are controlled by a gear shifting fork led out from a piston of the 3/4-gear shifting oil cylinder (15);
an upper left oil chamber of the 1-gear electromagnetic valve (10) is communicated with the oil tank (1), and an upper right oil chamber of the 1-gear electromagnetic valve (10) is communicated with a rodless chamber of the 1/2-gear shift oil cylinder (14);
an upper left oil cavity of the 2-gear electromagnetic valve (11) is communicated with a rod cavity of the 1/2-gear shifting oil cylinder (14), and an upper right oil cavity of the 2-gear electromagnetic valve (11) is communicated with the oil tank (1);
an upper left oil chamber of the 3-gear electromagnetic valve (12) is communicated with the oil tank (1), and an upper right oil chamber of the 3-gear electromagnetic valve (12) is communicated with a rod chamber of the 3/4-gear shift oil cylinder (15);
an upper left oil cavity of the 4-gear electromagnetic valve (13) is communicated with a rodless cavity of the 3/4-gear shifting oil cylinder (15), and an upper right oil cavity of the 4-gear electromagnetic valve (13) is communicated with the oil tank (1).
2. A gear interlocking method for electro-hydraulic gear shifting of a tractor transmission, which is characterized by being based on the gear interlocking system of claim 1 and carried out according to the following process:
step 1.1, if a gear 1/2 is engaged; then step 1.2 is executed; otherwise, indicating that 3/4 gear is engaged, and executing step 1.5;
step 1.2, switching the two-position three-way reversing valve (3) to an 3/4 gear oil way;
step 1.3, judging whether a gear shifting fork of an 3/4 gear oil way is in a middle position, if so, indicating that a 3/4 gear oil way is communicated to an oil way to which a gear needs to be engaged, so that interlocking is realized between a 1/2 gear oil way and a 3/4 gear oil way; otherwise, executing step 1.4;
step 1.4, manually operating a manual control mechanical valve (7) with 3/4 gears by using a gear shifting fork, adjusting a 3/4 gear oil way to a middle position, and returning to the step 1.3;
step 1.5, switching the two-position three-way reversing valve (3) to an 1/2 gear oil way;
step 1.6, judging whether a gear shifting fork of an 1/2 gear oil way is in a middle position, if so, indicating that a 1/2 gear oil way is communicated to an oil way to which a gear to be engaged belongs, so that interlocking is realized between a 3/4 gear oil way and a 1/2 gear oil way; otherwise, step 1.7 is executed;
and step 1.7, manually operating the manual control mechanical valve (6) with 1/2 gears by using a gear shifting fork, adjusting the oil circuit with 1/2 gears to a middle position, and returning to the step 1.6.
CN202210749877.5A 2022-06-28 2022-06-28 Gear interlocking system and method for electro-hydraulic gear shifting of tractor transmission Pending CN114909358A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115823246A (en) * 2022-11-21 2023-03-21 合肥工业大学 Correction system and method for mechanical gear engagement of tractor transmission

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115823246A (en) * 2022-11-21 2023-03-21 合肥工业大学 Correction system and method for mechanical gear engagement of tractor transmission
CN115823246B (en) * 2022-11-21 2024-06-11 合肥工业大学 Correction method for mechanical gear shifting of tractor transmission

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