Brand new four-wheel drive tractor gearbox hydraulic system

Abstract

The utility model provides a brand new four-wheel drive tractor gearbox hydraulic system which comprises a gearbox, a first gear pump and a second gear pump, a PTO piston, a four-wheel drive piston and a differential piston are arranged in the gearbox, and the first gear pump and the second gear pump are both connected with the gearbox through oil pipes. The output end of the first gear pump is connected with a first electromagnetic valve, a second electromagnetic valve and a third electromagnetic valve through oil pipes, the first electromagnetic valve is connected with a PTO piston through an oil pipe, the second electromagnetic valve is connected with a four-wheel-drive piston through an oil pipe, and the third electromagnetic valve is connected with a differential piston through an oil pipe. The second electromagnetic valve is further connected with the first shuttle valve through an oil pipe, and the first shuttle valve is connected with the second shuttle valve and the first electromagnetic valve through oil pipes. According to the hydraulic system, the heat dissipation function of the gearbox can be achieved, and the heat balance requirement is met; and two-drive switching can be carried out through electric control.

Description

TECHNICAL FIELD

[0001] The utility model relates to agricultural machinery technical field especially relates to a brand new four drive tractor gearbox hydraulic system. BACKGROUND

[0002] With the continuous promotion of agricultural mechanization, four drive tractor has been widely applied, and the user's control and energy consumption requirements of tractor are gradually improved, so a brand new variable speed hydraulic system is designed to meet the user's comfortable and convenient control and the demand of saving fuel consumption (four drive when working, two drive when transferring). UTILITY MODEL CONTENTS

[0003] The utility model aims at providing a brand new four drive tractor gearbox hydraulic system overcomes above problems or at least partially solves above problems.

[0004] In order to achieve the above object, the technical scheme of the utility model is as follows:

[0005] The utility model provides a brand new four drive tractor gearbox hydraulic system, including gearbox, first gear pump and second gear pump, the inside of gearbox is provided with PTO piston, four drive piston and differential piston respectively, first gear pump and second gear pump are connected with gearbox through oil pipe, the output end of first gear pump is connected with first electromagnetic valve, second electromagnetic valve and third electromagnetic valve through oil pipe respectively, first electromagnetic valve is connected with PTO piston through oil pipe, second electromagnetic valve is connected with four drive piston through oil pipe, third electromagnetic valve is connected with differential piston through oil pipe, second electromagnetic valve is also connected with first shuttle valve through oil pipe, first shuttle valve is connected with second shuttle valve and first electromagnetic valve through oil pipe respectively, second shuttle valve is connected with third electromagnetic valve and hydraulic control reversing valve through oil pipe respectively, hydraulic control reversing valve is connected with first check valve through oil pipe, first check valve is connected with first gear pump through oil pipe,

[0006] Second gear pump is connected with radiator and fourth check valve through oil pipe respectively, the oil outlet end of radiator is connected with gearbox through oil pipe, the oil outlet end of fourth check valve is connected with external outlet through oil pipe,

[0007] First gear pump is also connected with oil injection head through oil pipe, and the oil injection head is arranged in the gearbox, and the hydraulic control reversing valve is connected with the oil injection head through the oil pipe.

[0008] As a further scheme of the utility model, the first gear pump is further connected with the second one-way valve through an oil pipe, and the other end of the second one-way valve is connected with the external outlet through an oil pipe.

[0009] As a further scheme of the utility model, the first gear pump is further connected with the second one-way valve through an oil pipe, and the other end of the second one-way valve is connected with the external outlet through an oil pipe.

[0010] As a further scheme of the utility model, the first gear pump is further connected with the second one-way valve through an oil pipe, and the other end of the second one-way valve is connected with the external outlet through an oil pipe.

[0011] As a further scheme of the utility model, the first gear pump is further connected with the second one-way valve through an oil pipe, and the other end of the second one-way valve is connected with the external outlet through an oil pipe.

[0012] The utility model provides a kind of brand new four-wheel drive tractor gearbox hydraulic system, and beneficial effect is in at:

[0013] This hydraulic system can realize the heat dissipation function of gearbox, guarantee heat balance requirement;While guaranteeing gearbox oil product cleanliness;

[0014] Two drive switching can be carried out by electric control;When car is trapped in mud pit, differential lock can be opened to get out of trouble by electric control;PTO can be operated by electric control.

[0015] The second one-way valve can guarantee the heat dissipation and lubrication of gearbox internal parts, and delay service life. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical scheme of the embodiment of the utility model, the following will be briefly introduced to the drawing needed to be used in embodiment description, obviously, the drawing in the following description is only some embodiments of the utility model, for ordinary skilled person in the art, under the premise of not paying creative labor, other drawings can also be obtained according to these drawings.

[0017] Figure 1 It is the system diagram of the utility model.

[0018] In the figure: 1, the first gear pump; 2, the second gear pump; 3, the fine filter; 4, the radiator; 5, the hydraulic control reversing valve; 6, the coarse filter; 7, the gearbox; 8, the PTO piston; 9, the four-wheel drive piston; 10, the differential piston; 11, the first electromagnetic valve; 12, the second electromagnetic valve; 13, the third electromagnetic valve; 14, the first check valve; 15, the second check valve; 16, the third check valve; 17, the fourth check valve; 18, the first shuttle valve; 19, the second shuttle valve; 20, the oil injection head; 21, the pressure measuring port. DETAILED DESCRIPTION

[0019] Exemplary embodiments of the present disclosure will be described in greater detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it is understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that the present disclosure can be more thoroughly understood, and the scope of the present disclosure can be accurately conveyed to those skilled in the art.

[0020] Referring to Figure 1 The novel four-wheel drive tractor gearbox 7 hydraulic system provided by the embodiments of the present application comprises a gearbox 7, a first gear pump 1 and a second gear pump 2, the inside of the gearbox 7 is respectively provided with a PTO piston 8, a four-wheel drive piston 9 and a differential piston 10, the first gear pump 1 and the second gear pump 2 are both connected with the gearbox 7 through oil pipes, the output end of the first gear pump 1 is respectively connected with a first electromagnetic valve 11, a second electromagnetic valve 12 and a third electromagnetic valve 13 through oil pipes, the first electromagnetic valve 11 is connected with the PTO piston 8 through an oil pipe, the second electromagnetic valve 12 is connected with the four-wheel drive piston 9 through an oil pipe, the third electromagnetic valve 13 is connected with the differential piston 10 through an oil pipe, the second electromagnetic valve 12 is also connected with a first shuttle valve 18 through an oil pipe, the first shuttle valve 18 is respectively connected with a second shuttle valve 19 and the first electromagnetic valve 11 through oil pipes, the second shuttle valve 19 is respectively connected with the third electromagnetic valve 13 and a hydraulic control reversing valve 5 through oil pipes, the hydraulic control reversing valve 5 is connected with a first check valve 14 through an oil pipe, and the first check valve 14 is connected with the first gear pump 1 through an oil pipe.

[0021] The second gear pump 2 is connected with a radiator 4 and a fourth check valve 17 through oil pipes, the oil outlet end of the radiator 4 is connected with the gearbox 7 through an oil pipe, and the oil outlet end of the fourth check valve 17 is connected with an external outlet through an oil pipe.

[0022] The first gear pump 1 is also connected with an oil injection head 20 through an oil pipe, the oil injection head 20 is arranged in the gearbox 7, the hydraulic control reversing valve 5 is connected with the oil injection head 20 through an oil pipe, and the design of the oil injection head 20 can return hydraulic oil to the gearbox 7, thereby cooling and lubricating the PTO piston 8, the four-wheel drive piston 9 and the differential piston 10.

[0023] Further comprising a fine filter 3 and a coarse filter 6, the fine filter 3 is connected with the first gear pump 1 and the second gear pump 2 through oil pipes respectively, and the fine filter 3 is respectively at the oil outlet of the first gear pump 1 and the second gear pump 2, the coarse filter 6 is arranged on one side of the gearbox 7 and is connected between the gearbox 7 and the first gear pump 1 and the second gear pump 2, the hydraulic oil in the gearbox 7 is preliminarily filtered through the coarse filter 6, and the coarse filtered hydraulic oil is fine filtered through the fine filter 3.

[0024] The first gear pump 1 is further connected with the second one-way valve 15 through an oil pipe, and the other end of the second one-way valve 15 is connected with an external outlet through an oil pipe, the first electromagnetic valve 11, the second electromagnetic valve 12 and the third electromagnetic valve 13 are all connected with the external outlet through oil pipes, so that the excess hydraulic oil can be discharged into the hydraulic oil tank.

[0025] Further comprising two pressure measuring ports 21, one pressure measuring port 21 is connected with the third one-way valve 16 through an oil pipe, and the third one-way valve 16 is arranged between the first shuttle valve 18 and the first electromagnetic valve 11, and the other pressure measuring port 21 is connected with the first gear pump 1, the first one-way valve 14 and the second one-way valve 15 through oil pipes, and the design of the pressure measuring port 21 can test the delivery pressure of the hydraulic oil.

[0026] In the use process of the utility model,

[0027] After the tractor is started (the default state), the second gear pump 2 and the radiator 4 work to ensure heat dissipation; the fourth one-way valve 17 can prevent the radiator 4 from being blocked and damaged; the radiator 4 blockage will alarm to prompt cleaning and replacement; the coarse filter 6 and the fine filter 3 can effectively ensure the cleanliness, and prompt cleaning and replacement when blocked, effectively protecting the hydraulic system and the gearbox 7, the hydraulic system can realize the heat dissipation function of the gearbox 7, and ensure the heat balance requirement; and ensure the cleanliness of the gearbox 7 oil;

[0028] After the tractor is started, the tractor is started, the first gear pump 1 supplies oil, the oil passes through the second electromagnetic valve 12, the first shuttle valve 18, the second shuttle valve 19, cooperates with the first one-way valve 14 to close the hydraulic control reversing valve 5 to establish pressure, at this time, the four-wheel drive piston 9 works to realize the four-wheel drive function; the electric control opens the second electromagnetic valve 12, the four-wheel drive is switched to two-wheel drive, under this working condition (the PTO and the differential lock do not work during the field change), the hydraulic system has low power consumption and saves energy; the two-wheel drive can be switched through the electric control; when the vehicle is stuck in a mud pit, the differential lock can be opened through the electric control to get out of trouble; the PTO can be operated through the electric control.

[0029] In two-wheel or four-wheel drive mode, PTO (first solenoid valve 11 is operated) and differential lock (third solenoid valve 13 is operated) can be independently operated to switch (both through the electric control solenoid valve cooperates with the first shuttle valve 18, second shuttle valve 19, first check valve 14 to build pressure).

[0030] The second check valve can ensure the heat dissipation and lubrication of the internal parts of the gearbox 7, and prolong the service life.

[0031] The above is only an embodiment of the present application and is not intended to limit the present application. The present application can have various changes and variations for those skilled in the art. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application shall be included in the scope of claims of the present application.

Claims

1. A novel hydraulic system for a four-wheel drive tractor gearbox, comprising a gearbox (7), a first gear pump (1), and a second gear pump (2), characterized in that, The gearbox (7) is internally equipped with a PTO piston (8), a four-wheel drive piston (9), and a differential piston (10). The first gear pump (1) and the second gear pump (2) are connected to the gearbox (7) via oil pipes. The output end of the first gear pump (1) is connected to the first solenoid valve (11), the second solenoid valve (12), and the third solenoid valve (13) via oil pipes. The first solenoid valve (11) is connected to the PTO piston (8) via an oil pipe, the second solenoid valve (12) is connected to the four-wheel drive piston (9) via an oil pipe, and the third solenoid valve (13) is connected to the PTO piston (8) via an oil pipe. Valve (13) is connected to differential piston (10) via oil pipe. The second solenoid valve (12) is also connected to first shuttle valve (18) via oil pipe. The first shuttle valve (18) is connected to second shuttle valve (19) and first solenoid valve (11) via oil pipe. The second shuttle valve (19) is connected to third solenoid valve (13) and hydraulic directional valve (5) via oil pipe. The hydraulic directional valve (5) is connected to first check valve (14) via oil pipe. The first check valve (14) is connected to first gear pump (1) via oil pipe. The second gear pump (2) is connected to the radiator (4) and the fourth check valve (17) respectively through oil pipes. The oil outlet of the radiator (4) is connected to the gearbox (7) through oil pipes. The oil outlet of the fourth check valve (17) is connected to the external outlet through oil pipes. The first gear pump (1) is also connected to the fuel injector (20) via an oil pipe. The fuel injector (20) is located inside the gearbox (7). The hydraulic directional valve (5) is connected to the fuel injector (20) via an oil pipe.

2. The novel hydraulic system for a four-wheel drive tractor gearbox according to claim 1, characterized in that, It also includes a fine filter (3) and a coarse filter (6). The fine filter (3) is connected to the first gear pump (1) and the second gear pump (2) respectively through oil pipes. The fine filter (3) is located at the oil outlet of the first gear pump (1) and the second gear pump (2) respectively. The coarse filter (6) is located on one side of the gearbox (7) and connected between the gearbox (7) and the first gear pump (1) and the second gear pump (2).

3. The novel hydraulic system for a four-wheel drive tractor gearbox according to claim 1, characterized in that, The first gear pump (1) is also connected to the second check valve (15) via an oil pipe, and the other end of the second check valve (15) is connected to an external outlet via an oil pipe.

4. The novel hydraulic system for a four-wheel drive tractor gearbox according to claim 1, characterized in that, The first solenoid valve (11), the second solenoid valve (12) and the third solenoid valve (13) are all connected to the external outlet through oil pipes.

5. The novel hydraulic system for a four-wheel drive tractor gearbox according to claim 1, characterized in that, It also includes a pressure test port (21), which has two ports. One pressure test port (21) is connected to the third check valve (16) through an oil pipe, and the third check valve (16) is located between the first shuttle valve (18) and the first solenoid valve (11). The other pressure test port (21) is connected to the first gear pump (1), the first check valve (14) and the second check valve (15) through an oil pipe.

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