CN218913316U - Hydraulic system of agricultural tractor and tractor - Google Patents
Hydraulic system of agricultural tractor and tractor Download PDFInfo
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- CN218913316U CN218913316U CN202222954439.0U CN202222954439U CN218913316U CN 218913316 U CN218913316 U CN 218913316U CN 202222954439 U CN202222954439 U CN 202222954439U CN 218913316 U CN218913316 U CN 218913316U
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Abstract
The utility model relates to a hydraulic system of an agricultural tractor and the tractor. The hydraulic system includes: an oil outlet of the first oil pump is connected with an oil inlet of the priority valve, one oil outlet of the priority valve is connected with an oil inlet of the steering gear, a steering oil outlet of the steering gear is connected with an oil inlet of the steering oil cylinder, an oil return port of the steering oil cylinder is connected with a steering oil return port of the steering gear, a control oil way is connected with a control oil port of the priority valve and a control oil port of the steering gear, and a control oil port of the priority valve is connected with an oil return port of the oil tank; the other oil outlet of the priority valve is connected with the main oil inlet of the multi-way valve, and the oil outlet and the oil inlet of one way valve in the multi-way valve are connected with a rod cavity and a rodless cavity of the lifting oil cylinder; an oil outlet of the second gear pump is respectively connected with an oil inlet of each electromagnetic valve in the electromagnetic valve group and an inlet of the radiator. The advantages are that: the power loss caused by excessive oil supply of the steering oil way is eliminated, and the failure rate of the steering gear caused by excessive steering oil return back pressure is also reduced.
Description
Technical Field
The utility model relates to the field of agricultural machinery, in particular to a hydraulic system of an agricultural tractor and the tractor.
Background
The agricultural machinery industry in China has been developed for years, the industrial structure is continuously optimized, low-end products with the technology lagged are being phased out, the agricultural machinery industry is developing towards the large-scale, high-end and intelligent directions, the hydraulic technology is applied to the tractor more and more widely, and the upgrading of the hydraulic system plays a vital role in the future tractor development.
The existing steering system and lifting system respectively provide hydraulic oil for the existing steering system and lifting system through two groups or one group of duplex gear pumps, steering oil is taken from a steering oil tank, and lifting system oil is taken from a shell oil tank and can also all share the same oil suction port from a gearbox or a rear axle shell. The control oil way is used for oil return from the steering system, and the hydraulic oil radiator and the lubricating oil way are also connected in series on the steering system oil return oil way for controlling the electromagnetic valve or other elements.
The existing steering system is an independent steering system, a steering hydraulic pump controls a steering device, then the steering device controls a front axle oil cylinder through a metering motor, oil return of the steering system enters an electromagnetic valve to control a PTO, a differential mechanism and the like, hydraulic oil is connected with a lubricating oil way in series on an oil return path of the steering system, and because the steering oil return oil way is connected with more loads in series, the requirement on the back pressure of the steering device is higher, and particularly under the condition that oil is more viscous in winter, the steering oil return load pressure is higher, so that the steering device is a test.
When the existing steering system control valve group is an open core system and the system does not work or the control valve is in a neutral position, hydraulic oil output by a hydraulic pump returns to a hydraulic oil tank through a middle position M-shaped machine of the control valve or enters an electromagnetic valve to be dispersed with the hydraulic oil through a control oil path, because the required flow of the electromagnetic valve and a steering gear is constant, when the steering flow of an engine is overlarge, the steering wheel is easy to cause steering to drift due to too high rotating speed, and more steering return flow enters the electromagnetic valve to open an overflow valve to flow back to the oil tank, so that the electromagnetic valve heats.
The existing lifting system is an independent lifting system, oil liquid is controlled to be output by a hydraulic pump, the oil liquid is taken from a lifting shell oil tank, the lifting control system is mainly provided with an external mechanical operating valve group in series in the system, and the functions of lifting and descending of the machine tool are realized by controlling an operating valve rod. Although the structure is simple, the manufacturing cost is low, the external operating mechanism is often limited by the space of the whole machine in structural arrangement
Disclosure of Invention
The utility model aims to solve the technical problem of providing an agricultural tractor hydraulic system and a tractor, and effectively overcomes the defects of the prior art.
The technical scheme for solving the technical problems is as follows:
the hydraulic system of the agricultural tractor comprises a steering control system, wherein the steering control system comprises a first oil pump, a priority valve, a steering device, a steering oil cylinder and a control oil way, an oil inlet of the first oil pump is connected with an oil tank, an oil outlet of the first oil pump is connected with an oil inlet of the priority valve, one oil outlet of the priority valve is connected with an oil inlet of the steering device, a steering oil outlet of the steering device is connected with an oil inlet of the steering oil cylinder, an oil return port of the steering oil cylinder is connected with a steering oil return port of the steering device, a main oil return port of the steering oil cylinder is connected with an oil return port of the oil tank, the control oil way is connected with a control oil port of the priority valve and a control oil port of the steering device, and the control oil port of the priority valve is connected with an oil return port of the oil tank;
the lifting control system comprises a multi-way valve and a lifting oil cylinder, the other oil outlet of the priority valve is connected with the main oil inlet of the multi-way valve, the oil outlet and the oil inlet of one way valve in the multi-way valve are respectively connected with a rod cavity and a rodless cavity of the lifting oil cylinder, the oil outlets and the oil inlets of the rest way valves in the multi-way valve are respectively connected with a quick-change connector in a one-to-one correspondence manner, and the oil return port of the multi-way valve is connected with the oil return port of the oil tank;
the oil way control system comprises a second gear pump, an electromagnetic valve bank and a radiator, wherein an oil inlet of the second gear pump is connected with an oil tank, an oil outlet of the second gear pump is respectively connected with an oil inlet of each electromagnetic valve in the electromagnetic valve bank and an inlet of the radiator, an oil return port of each electromagnetic valve in the electromagnetic valve bank is respectively connected with an oil return port of the oil tank, an outlet of the radiator is connected with an oil return port of the oil tank, and an oil outlet of each electromagnetic valve in the electromagnetic valve bank is respectively connected with a transmission control oil way.
On the basis of the technical scheme, the utility model can be improved as follows.
Further, the oil suction device further comprises an oil suction filter, and the oil suction filter is connected between the oil inlets of the first oil pump and the second oil pump and the oil tank.
Further, each valve in the multi-way valve is provided with two groups of oil outlets and oil inlets, wherein one group of oil inlets and oil outlets are respectively connected with a rod cavity and a rodless cavity of the lifting oil cylinder, and the other group of oil outlets and oil inlets are respectively connected with a quick-change connector.
Further, the multi-way valve is provided with a three-way valve.
Further, the electromagnetic valve group comprises four electromagnetic valves.
The multi-way valve further comprises an oil return filter, and the oil return filter is connected between an oil return port of each way valve in the multi-way valve and an oil return port of the oil tank.
Further, the oil pump further comprises a medium-pressure filter, and the medium-pressure filter is connected between the oil outlet of the second oil pump and the electromagnetic valve group.
Further, the first oil pump and the second oil pump are gear pumps.
The beneficial effects of the utility model are as follows: the steering priority is realized through the ingenious combination of the oil pump and the priority valve, the steering stability can be ensured, the power loss caused by excessive oil supply of a steering oil way is eliminated, and the failure rate of the steering gear caused by excessive steering oil return back pressure is also reduced. The oil way control system is independently controlled by the other group of pumps, so that the flow stability of the control oil way is ensured, and the heating of the system is reduced.
A tractor is also provided, including an agricultural tractor hydraulic system.
Drawings
Fig. 1 is a schematic diagram of a hydraulic system for an agricultural tractor and a tractor according to the present utility model.
In the drawings, the list of components represented by the various numbers is as follows:
1. an oil absorption filter; 2. a first oil pump; 3. a priority valve; 4. a diverter; 5. a quick-change joint; 6. an oil return filter; 7. a multiway valve; 8. a lifting cylinder; 9. a steering cylinder; 10. an electromagnetic valve group; 11. controlling an oil path; 12. a medium pressure filter; 13. a heat sink; 14. and a second oil pump.
Detailed Description
The principles and features of the present utility model are described below with reference to the drawings, the examples are illustrated for the purpose of illustrating the utility model and are not to be construed as limiting the scope of the utility model.
Examples
As shown in fig. 1, the hydraulic system for an agricultural tractor of the present embodiment is characterized in that: comprising the following steps:
the steering control system comprises a first oil pump 2, a priority valve 3, a steering device 4, a steering oil cylinder 9 and a control oil way 11, wherein the oil inlet of the first oil pump 2 is connected with an oil tank, the oil outlet of the first oil pump is connected with the oil inlet (P port in the figure) of the priority valve 3, one oil outlet (a port in the figure) of the priority valve 3 is connected with the oil inlet (P1 port in the figure) of the steering device 4, the steering oil outlet (c port in the figure) of the steering device 4 is connected with the oil inlet (c 1 port in the figure) of the steering oil cylinder 9, the oil return port (d 1 port in the figure) of the steering oil cylinder 9 is connected with the steering oil return port (d port in the figure) of the steering device 4, the main oil return port (F port in the figure) of the steering oil cylinder 9 is connected with the oil return port of the oil tank, the control oil way 11 is connected with the control oil port (c 2 in the figure) of the priority valve 3 and the control oil port (E port in the figure) of the steering device 4, and the control oil port of the priority valve 3 is connected with the oil return port of the oil tank;
the lifting control system comprises a multi-way valve 7 and a lifting oil cylinder 8, wherein the other oil outlet (b port in the figure) of the priority valve 3 is connected with a main oil inlet (P2 port in the figure) of the multi-way valve 7, the oil outlet and the oil inlet of one way valve in the multi-way valve 7 are respectively connected with a rod cavity and a rodless cavity of the lifting oil cylinder 8, the oil outlets and the oil inlets of the rest other way valves in the multi-way valve 7 are respectively connected with a quick-change connector 5 in a one-to-one correspondence manner, and the oil return port of the multi-way valve 7 is connected with the oil return port of an oil tank;
the oil circuit control system comprises a second oil pump 14, an electromagnetic valve bank 10 and a radiator 13, wherein an oil inlet of the second oil pump 14 is connected with an oil tank, an oil outlet (P3 port in the figure) of the second oil pump is respectively connected with an oil inlet of each electromagnetic valve in the electromagnetic valve bank 10 and an inlet (A5 port in the figure) of the radiator 13, an oil return port of the oil tank is respectively connected with an oil return port of each electromagnetic valve in the electromagnetic valve bank 10, an oil return port of the oil tank is connected with an outlet of the radiator 13, and an oil outlet of each electromagnetic valve in the electromagnetic valve bank 10 is respectively connected with a transmission control oil circuit.
In the embodiment, the steering hydraulic control system is a closed core control system, so that hydraulic oil output by the gear pump is guaranteed to enter the steering system to work preferentially, and redundant oil enters the lifting system to work through reversing of the priority valve.
When the steering wheel is in a neutral position or not moved, hydraulic oil enters the first oil pump 2, the first oil pump 2 outputs the hydraulic oil to pass through the priority valve 3, and at the moment, the valve core of the steering gear 4 is in a neutral position because the steering oil cylinder 9 is not loaded, and the control oil port oil on the right side of the priority valve 3 flows back to the oil tank through the C2. The pressure balance state at the two ends of the valve core of the priority valve 3 is destroyed, the oil liquid at the right side flows, at the moment, the P is more than P spring, the priority valve works at the left position, at the moment, most of the oil liquid enters the multi-way valve 7 or the lifting system to work through the oil way at the port b of the priority valve 3.
In the process of steering wheel left-hand steering or right-hand steering, when the system flow just meets the steering system working flow, hydraulic oil is output through the first oil pump 2 and enters the priority valve 3, at the moment, the valve core of the steering device 4 is at the left position or the right position, the control oil way pressure on the right side of the priority valve 3 is from the steering load pressure Pm, the control oil way pressure on the left side of the priority valve 3 is from the gear pump oil outlet pressure P, and because Pright+Pspring is more than P, the right position of the priority valve 3 works, at the moment, the oil liquid preferentially enters the steering system to work.
In the process of steering wheel left-hand steering or right-hand steering, when the system flow is greater than the steering system working flow, hydraulic oil is output through the first oil pump 2 and enters the priority valve 3, the valve core of the steering device 3 is positioned at the left position or the right position, the pressure of a control oil way 11 on the right side of the priority valve 3 is from steering load pressure Pm, and because the left control position or the right control position of the valve core of the steering device 4 is provided with a throttle, the pressure difference at two ends of the throttle in the oil inlet of the steering device 3 is changed due to flow increase, the pressure of the control oil way on the left side of the priority valve 3 is equal to the oil outlet pressure of the gear pump, and because the Pright+Pspring is smaller than P, the left position of the priority valve 3 works, and at the moment, part of the oil enters the steering system to work and part of the oil enters the lifting system to work.
After the steering wheel is "dead", the hydraulic oil pressure of the control oil way 11 on the right side of the priority valve 3 rises to open the safety valve on the right side of the priority valve 3 to drain, at this time, the control oil way 11 on the right side of the priority valve 3 flows oil, the priority valve 3 moves right under the control pressure on the left side, the priority valve 3 works left, and at this time, most oil enters the multi-way valve 7 or the lifting system to work through the port b.
The lifting control system is a happy control system, the lifting system works or when the hydraulic oil output by the first oil pump 2 continuously increases, the front-rear pressure difference delta P inside the priority valve 3 is increased, the oil outlet pressure of the priority valve 3 is increased to keep the front-rear pressure difference balance of the priority valve 3, at the moment, the spring P is less than P at the right side and P, at the moment, the priority valve 3 moves left and right, the priority valve 3 works left, at the moment, part of oil enters the steering system to work and the part of oil enters the lifting system to work.
The second oil pump 14 supplies oil continuously, the pressure of the control oil circuit is set by the safety valve of the electromagnetic valve in the electromagnetic valve group 10, and the safety valve provides oil and pressure for the output oil ports (MA 1, MA2, MA3 and MA4 in the figure) of each electromagnetic valve in the electromagnetic valve group 10 due to the pressure setting, so that the pressure of the control oil circuit always maintains a certain working pressure. The internal safety valve of the electromagnetic valve is opened, and the pressure oil output by the second oil pump 14 flows back to the oil tank through the radiator 13.
What needs to be stated is: the priority valve 3 and the steering gear 4 are all products in the prior art, and the priority valve 3 is integrated with hydraulic elements such as a two-position three-way proportional reversing valve, a throttle valve and the like; the steering gear 4 integrates a metering motor, a three-position seven-way reversing valve, an overflow valve, a one-way valve and other hydraulic elements.
In this embodiment, the oil absorption filter 1 is further included, and the oil absorption filter 1 is connected between the oil inlets of the first oil pump 2 and the second oil pump 14 and the oil tank. The oil absorption filter 1 can filter the hydraulic oil from the oil tank, and prevent impurities from entering the subsequent oil way to be accumulated.
In this embodiment, each valve in the multiway valve 7 has two groups of oil outlets and oil inlets, wherein one group of oil inlets and oil outlets are respectively connected with the rod cavity and the rodless cavity of the lifting cylinder 8, and the other group of oil outlets and oil inlets are respectively connected with the quick-change connector 5.
In this embodiment, the multiway valve 7 has a three-way valve connected in parallel.
In this embodiment, the solenoid valve assembly 10 includes four solenoid valves connected in parallel.
In this embodiment, the device further includes an oil return filter 6, and the oil return filter 6 is connected between an oil return port of each valve in the multiple-way valve 7 and an oil return port of the oil tank. The oil return filter 6 can filter the hydraulic oil entering the oil tank, and prevent impurities from entering the accumulation.
In this embodiment, the present utility model further includes a medium pressure filter 12, and the medium pressure filter 12 is further connected between the oil outlet of the second oil pump 14 and the solenoid valve group 10. The medium pressure filter 12 can filter the hydraulic oil that enters the solenoid valve, avoiding accumulation of impurities in the oil passage.
In the present embodiment, the first oil pump 2 and the second oil pump 14 are gear pumps of the related art.
In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present utility model, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
While embodiments of the present utility model have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the utility model, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the utility model.
Claims (9)
1. An agricultural tractor hydraulic system, characterized in that: comprising the following steps:
the steering control system comprises a first oil pump (2), a priority valve (3), a steering device (4), a steering oil cylinder (9) and a control oil way (11), wherein an oil inlet of the first oil pump (2) is connected with an oil tank, an oil outlet of the first oil pump is connected with an oil inlet of the priority valve (3), one oil outlet of the priority valve (3) is connected with an oil inlet of the steering device (4), a steering oil outlet of the steering device (4) is connected with an oil inlet of the steering oil cylinder (9), an oil return port of the steering oil cylinder (9) is connected with a steering oil return port of the steering device (4), a main oil return port of the steering oil cylinder (9) is connected with an oil return port of the oil tank, and the control oil way (11) is connected with a control oil port of the priority valve (3) and a control oil port of the steering device (4), and the control oil port of the priority valve (3) is connected with an oil return port of the oil tank;
the lifting control system comprises a multi-way valve (7) and a lifting oil cylinder (8), wherein the other oil outlet of the priority valve (3) is connected with a main oil inlet of the multi-way valve (7), the oil outlet and the oil inlet of one way valve in the multi-way valve (7) are respectively connected with a rod cavity and a rodless cavity of the lifting oil cylinder (8), the oil outlets and the oil inlets of the other way valves in the multi-way valve (7) are respectively connected with a quick-change connector (5) in one-to-one correspondence, and an oil return port of the multi-way valve (7) is connected with an oil return port of an oil tank;
the oil circuit control system comprises a second oil pump (14), an electromagnetic valve bank (10) and a radiator (13), wherein an oil inlet of the second oil pump (14) is connected with an oil tank, an oil outlet of the oil pump is respectively connected with an oil inlet of each electromagnetic valve in the electromagnetic valve bank (10) and an inlet of the radiator (13), an oil return port of the oil tank is connected with an oil return port of the oil tank through an oil return port of each electromagnetic valve in the electromagnetic valve bank (10), an oil outlet of the radiator (13) is connected with an oil return port of the oil tank, and an oil outlet of each electromagnetic valve in the electromagnetic valve bank (10) is respectively connected with a transmission control oil circuit.
2. An agricultural tractor hydraulic system as defined by claim 1 wherein: the oil tank is characterized by further comprising an oil absorption filter (1), wherein the oil inlets of the first oil pump (2) and the second oil pump (14) are connected with the oil absorption filter (1) between the oil tanks.
3. An agricultural tractor hydraulic system as defined by claim 1 wherein: each valve in the multi-way valve (7) is provided with two groups of oil outlets and oil inlets, wherein one group of oil inlets and oil outlets are respectively connected with a rod cavity and a rodless cavity of the lifting oil cylinder (8), and the other group of oil outlets and oil inlets are respectively connected with the quick-change connector (5).
4. A hydraulic system for an agricultural tractor as defined by claim 3 wherein: the multi-way valve (7) is provided with a three-way valve.
5. An agricultural tractor hydraulic system as defined by claim 1 wherein: the electromagnetic valve group (10) comprises four electromagnetic valves.
6. An agricultural tractor hydraulic system as defined by claim 1 wherein: the oil return device is characterized by further comprising an oil return filter (6), wherein the oil return filter (6) is connected between the oil return port of each valve in the multi-way valve (7) and the oil return port of the oil tank.
7. An agricultural tractor hydraulic system as defined by claim 1 wherein: the electromagnetic valve further comprises a medium-pressure filter (12), and the medium-pressure filter (12) is further connected between an oil outlet of the second oil pump (14) and the electromagnetic valve group (10).
8. An agricultural tractor hydraulic system as defined by claim 1 wherein: the first oil pump (2) and the second oil pump (14) are gear pumps.
9. A tractor, characterized in that: an agricultural tractor hydraulic system comprising the hydraulic system of any one of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222954439.0U CN218913316U (en) | 2022-11-07 | 2022-11-07 | Hydraulic system of agricultural tractor and tractor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222954439.0U CN218913316U (en) | 2022-11-07 | 2022-11-07 | Hydraulic system of agricultural tractor and tractor |
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| Publication Number | Publication Date |
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| CN218913316U true CN218913316U (en) | 2023-04-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202222954439.0U Active CN218913316U (en) | 2022-11-07 | 2022-11-07 | Hydraulic system of agricultural tractor and tractor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117090819A (en) * | 2023-10-20 | 2023-11-21 | 山东亿嘉农业机械装备股份有限公司 | Tractor tail hydraulic system assembly |
-
2022
- 2022-11-07 CN CN202222954439.0U patent/CN218913316U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117090819A (en) * | 2023-10-20 | 2023-11-21 | 山东亿嘉农业机械装备股份有限公司 | Tractor tail hydraulic system assembly |
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