Agricultural machine walking and PTO control hydraulic system

Abstract

The utility model provides an agricultural machinery walking and PTO control hydraulic system which comprises an oil supply pump, a walking pump, a walking motor, a two-position three-way electromagnetic valve and a PTO clutch, and the walking pump and the walking motor are in loop connection through a first oil way and a second oil way; a first branch and a second branch are arranged on an outlet pipeline of the oil supply pump, the first branch is connected with the first oil way through a first one-way valve, and the first branch is connected with the second oil way through a second one-way valve. One port of the two-position three-way electromagnetic valve is connected with the second branch, and the second port of the two-position three-way electromagnetic valve is connected with the PTO clutch. According to the utility model, the hydraulic oil is supplied to the walking oil supplementing system and the PTO control hydraulic system through the first branch and the second branch, so that the integration is high, and the cost of the whole machine is reduced; oil is supplemented to the low-pressure side of the walking pump through the first one-way valve and the second one-way valve, hydraulic oil on the high-pressure side is prevented from leaking into the first branch, and reliability is good.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic systems for agricultural machinery, in particular to a hydraulic system for traveling and PTO control of agricultural machinery. Background Art

[0002] At present, the HST travel system oil replenishment, PTO control, and lubrication of agricultural machinery such as tractors require separate hydraulic systems to realize the functions of HST travel system oil replenishment, PTO output power hydraulic control, and whole machine lubrication. Each hydraulic system needs to be matched with different hydraulic power sources and filters, which results in high cost and complex control. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a highly integrated walking and PTO control hydraulic system to reduce the cost of the whole machine.

[0004] The technical solution of the utility model to solve the above technical problems is as follows:

[0005] The utility model provides a hydraulic system for agricultural machinery travel and PTO control, comprising an oil supply pump, a travel pump, a travel motor, a two-position three-way solenoid valve, and a PTO clutch, wherein the travel pump and the travel motor form a loop connection through a first oil circuit and a second oil circuit; a first branch and a second branch are arranged on the outlet pipeline of the oil supply pump, the first branch and the first oil circuit are connected through a first one-way valve, and the first branch and the second oil circuit are connected through a second one-way valve; one port of the two-position three-way solenoid valve is connected to the second branch, and two ports of the two-position three-way solenoid valve are connected to the PTO clutch.

[0006] The beneficial effects of the utility model are:

[0007] By adopting the utility model, hydraulic oil is supplied to the travel oil replenishing system and the PTO control hydraulic system through the first branch and the second branch respectively, with high integration, and only one oil supply pump is needed, thereby reducing the cost of the whole machine; in the travel oil replenishing system, the first one-way valve and the second one-way valve are used to replenish oil to the low-pressure side of the travel pump, while preventing the hydraulic oil on the high-pressure side from leaking into the first branch, and having good reliability.

[0008] On the basis of the above technical solution, the present invention can also be improved as follows.

[0009] Furthermore, it also includes an oil tank, the inlet pipeline of the oil supply pump is connected to the oil tank, the oil return port of the two-position three-way solenoid valve is connected to the oil tank, and the first branch is also provided with an oil replenishment overflow valve, and the outlet of the oil replenishment overflow valve is connected to the oil tank.

[0010] The oil tank provides an oil source for the oil supply pump and facilitates the recycling of hydraulic oil in the first branch and the second branch, thereby reducing operating costs; the oil replenishment relief valve can control the oil replenishment pressure of the travel oil replenishment system, and the excess oil pressure overflows back to the oil tank, which has good reliability.

[0011] Furthermore, it also includes a lubricating oil supply pipeline, the inlet of the lubricating oil supply pipeline is connected to a flow valve, and a third branch is also provided on the outlet pipeline of the oil supply pump, and the third branch is connected to the inlet of the flow valve.

[0012] The lubrication oil supply pipeline can be used to connect various lubrication systems of agricultural machinery, which is convenient for supplying oil to the lubrication system, so that the lubrication system, travel oil replenishment system and PTO control hydraulic system can share a set of hydraulic system oil supply, thereby improving integration.

[0013] Furthermore, the outlet of the flow valve is also connected to the oil tank through a safety oil circuit, and a safety valve is provided on the safety oil circuit.

[0014] It avoids pressure fluctuations in the lubrication system and improves system safety.

[0015] Furthermore, an oil suction filter is provided on the inlet pipeline of the oil supply pump, and a third one-way valve is connected in parallel to the oil suction filter.

[0016] It is convenient to filter the hydraulic oil in a centralized manner, ensuring the overall cleanliness of the hydraulic system and improving the reliability of the whole machine; the third one-way valve can allow part of the hydraulic oil to pass when the flow demand is large or the oil suction filter is damaged, ensuring the reliable operation of the system and avoiding sudden necrosis.

[0017] Furthermore, an oil cooler is provided on the outlet pipeline of the oil supply pump, and the outlet of the oil cooler is connected to the first branch, the second branch and the third branch respectively.

[0018] It is convenient to centrally cool the oil output of the oil supply pump and maintain a good thermal balance temperature for the whole machine.

[0019] Furthermore, a fourth one-way valve is connected in parallel to the oil cooler.

[0020] The fourth one-way valve can allow part of the hydraulic oil to pass through when the flow demand is large or the oil cooler is damaged, ensuring the reliable operation of the system and avoiding sudden necrosis.

[0021] Furthermore, a precision filter is provided on the first branch line, the first one-way valve is connected between the outlet of the precision filter and the first oil circuit, and the second one-way valve is connected between the outlet of the precision filter and the second oil circuit.

[0022] It is convenient to filter the hydraulic oil of the travel oil replenishing system, improve the cleanliness of the travel system, and improve the system reliability.

[0023] Furthermore, a fifth one-way valve is connected in parallel to the precision filter.

[0024] The fifth one-way valve can allow part of the hydraulic oil to pass when the flow demand is large or the precision filter is damaged, ensuring the reliable operation of the system and avoiding sudden necrosis of the travel oil replenishment system.

[0025] Furthermore, two one-way pressure relief valves are connected between the first oil circuit and the second oil circuit, and the directions of the two one-way pressure relief valves are opposite.

[0026] When the travel pump pressure is too high, it is convenient to release the excess pressure to the low-pressure side to avoid overloading the travel motor; at the same time, when shutting down, it is convenient to open the two one-way pressure relief valves to release pressure, so as to protect the hydraulic pipeline and increase the life of the whole machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of the utility model.

[0028] In the accompanying drawings, the technical features represented by the reference numerals are as follows:

[0029] 1-Oil supply pump; 2-Travel pump; 3-Travel motor; 4-Two-position three-way solenoid valve; 5-PTO clutch; 6-First oil circuit; 7-Second oil circuit; 8-First one-way valve; 9-Second one-way valve; 10-Oil tank; 11-Oil replenishment overflow valve; 12-Lubricating oil supply pipeline; 13-Flow valve; 14-Safety valve; 15-Oil suction filter; 16-Third one-way valve; 17-Oil cooler; 18-Fourth one-way valve; 19-Precision filter; 20-Fifth one-way valve; 21-One-way pressure relief valve. DETAILED DESCRIPTION

[0030] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0031] This utility model refers to Figure 1 .

[0032] The utility model provides a hydraulic system for agricultural machinery travel and PTO control, comprising an oil supply pump 1, a travel pump 2, a travel motor 3, a two-position three-way solenoid valve 4, and a PTO clutch 5. The travel pump 2 and the travel motor 3 form a loop connection through a first oil circuit 6 and a second oil circuit 7; a first branch and a second branch are provided on the outlet pipeline of the oil supply pump 1, the first branch and the first oil circuit 6 are connected through a first one-way valve 8, and the first branch and the second oil circuit 7 are connected through a second one-way valve 9; one port of the two-position three-way solenoid valve 4 is connected to the second branch, and two ports of the two-position three-way solenoid valve 4 are connected to the PTO clutch 5.

[0033] principle:

[0034] The travel pump 2 and the travel motor 3 belong to the HST hydraulic travel system in agricultural machinery such as tractors. The oil supply direction of the travel pump 2 controls the rotation direction of the travel motor 3, thereby controlling the forward or reverse movement of the agricultural machinery. When the travel pump 2 is in operation, the side of the first oil circuit 6 and the second oil circuit 7 corresponding to the outlet of the travel pump 2 is the high-pressure side, and the side corresponding to the inlet of the travel pump 2 is the low-pressure side. When the circuit composed of the first oil circuit 6 and the second oil circuit 7 needs to be replenished with oil, the hydraulic oil in the first branch is replenished to the low-pressure side through the first check valve 8 or the second check valve 9, while preventing the hydraulic oil on the high-pressure side from leaking into the first branch.

[0035] The PTO clutch 5 belongs to the PTO power output system in agricultural machinery such as tractors. The opening and closing of the PTO clutch 5 controls the connection or separation of the PTO output power. When the two-position three-way solenoid valve 4 is powered on, the hydraulic oil of the second branch enters the PTO clutch 5 through the two-position three-way solenoid valve 4, so that the PTO clutch 5 is in a connected state; when the two-position three-way solenoid valve 4 is de-energized and closed, the hydraulic oil of the PTO clutch 5 returns through the oil return port of the two-position three-way solenoid valve 4, so that the PTO clutch 5 is in a disengaged state.

[0036] In summary, by adopting the utility model, hydraulic oil is supplied to the travel oil replenishment system and the PTO control hydraulic system through the first branch and the second branch respectively, with high integration, and only one oil supply pump 1 is required, thereby reducing the cost of the whole machine; in the travel oil replenishment system, the first one-way valve 8 and the second one-way valve 9 are used to replenish oil to the low-pressure side of the travel pump 2, while preventing the hydraulic oil on the high-pressure side from leaking into the first branch, and having good reliability.

[0037] Furthermore, it also includes an oil tank 10, the inlet pipeline of the oil supply pump 1 is connected to the oil tank 10, the oil return port of the two-position three-way solenoid valve 4 is connected to the oil tank 10, and the first branch is also provided with an oil replenishment overflow valve 11, and the outlet of the oil replenishment overflow valve 11 is connected to the oil tank 10.

[0038] The oil tank 10 provides an oil source for the oil supply pump 1 and facilitates the recycling of the hydraulic oil in the first branch and the second branch, thereby reducing operating costs; the oil replenishment overflow valve 11 can control the oil replenishment pressure of the travel oil replenishment system, and the excess oil pressure overflows back to the oil tank 10, which has good reliability.

[0039] Furthermore, it also includes a lubricating oil supply pipeline 12 , the inlet of which is connected to a flow valve 13 , and a third branch is also provided on the outlet pipeline of the oil supply pump 1 , which is connected to the inlet of the flow valve 13 .

[0040] The lubrication oil supply pipeline 12 can be used to connect various lubrication systems of agricultural machinery, which is convenient for supplying oil to the lubrication system, so that the lubrication system, travel oil replenishment system and PTO control hydraulic system can share a set of hydraulic system oil supply, thereby improving integration.

[0041] Furthermore, the outlet of the flow valve 13 is also connected to the oil tank 10 through a safety oil circuit, and a safety valve 14 is provided on the safety oil circuit.

[0042] It avoids pressure fluctuations in the lubrication system and improves system safety.

[0043] Furthermore, an oil suction filter 15 is provided on the inlet pipeline of the oil supply pump 1 , and a third one-way valve 16 is connected in parallel to the oil suction filter 15 .

[0044] It is convenient to filter the hydraulic oil in a centralized manner, thus ensuring the overall cleanliness of the hydraulic system and improving the reliability of the whole machine; the third one-way valve 16 can allow part of the hydraulic oil to pass through when the flow demand is large or the oil suction filter 15 is damaged, thus ensuring the reliable operation of the system and avoiding sudden necrosis.

[0045] Furthermore, an oil cooler 17 is provided on the outlet pipeline of the oil supply pump 1, and the outlet of the oil cooler 17 is connected to the first branch, the second branch and the third branch respectively.

[0046] It is convenient to centrally cool the oil output of the oil supply pump 1 and maintain a good thermal balance temperature of the whole machine.

[0047] Furthermore, a fourth one-way valve 18 is connected in parallel to the oil cooler 17 .

[0048] The fourth one-way valve 18 can allow part of the hydraulic oil to pass through when the flow demand is large or the oil cooler 17 is damaged, thereby ensuring reliable operation of the system and avoiding sudden necrosis.

[0049] Furthermore, a precision filter 19 is provided on the first branch, the first one-way valve 8 is connected between the outlet of the precision filter 19 and the first oil circuit 6 , and the second one-way valve 9 is connected between the outlet of the precision filter 19 and the second oil circuit 7 .

[0050] It is convenient to filter the hydraulic oil of the travel oil replenishing system, improve the cleanliness of the travel system, and improve the system reliability.

[0051] Furthermore, a fifth one-way valve 20 is connected in parallel to the precision filter 19 .

[0052] The fifth one-way valve 20 can allow part of the hydraulic oil to pass through when the flow demand is large or the precision filter 19 is damaged, thereby ensuring the reliable operation of the system and avoiding sudden necrosis of the traveling oil replenishing system.

[0053] Furthermore, two one-way pressure relief valves 21 are connected between the first oil circuit 6 and the second oil circuit 7 , and the directions of the two one-way pressure relief valves 21 are opposite.

[0054] When the pressure of the travel pump 2 is too high, it is convenient to release the excess pressure to the low-pressure side to avoid overloading of the travel motor 3; at the same time, when shutting down, it is convenient to open the two one-way pressure relief valves 21 to release pressure, so as to protect the hydraulic pipeline and increase the life of the whole machine.

[0055] In the description of the present invention, it should be understood that if there are descriptive terms indicating orientation, direction or positional relationship, such as: "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., the orientation or positional relationship indicated in this specification is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of understanding the present invention and simplifying the description, and does not indicate or imply that the referred part, element or whole must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0056] In addition, if there are order description terms, such as "first", "second", etc., their purpose in this specification is to facilitate understanding or simplify description. For example, in order to distinguish multiple technical features of the same type or function, but they have to be mentioned separately, this specification may use prefix or suffix order description terms to distinguish them. Therefore, it cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0057] In the present utility model, if the terms describing the relative functional relationship of the structures are used, such as "install", "connect", "connect", "fix", etc., they should be understood in a broad sense unless otherwise clearly specified and limited. For example, "install", "connect", "connect", etc. can be a fixed connection, a detachable connection, or an integrated one; can be a mechanical connection or an electrical connection; can be a direct connection or an indirect connection through an intermediate medium, can be the internal connection of two elements or the interaction relationship between two elements; "fix" can be an integrated fixation or a detachable fixation through fasteners; can be a direct fixation or a fixation through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above-mentioned descriptive terms in the present utility model can be understood according to the specific circumstances, the context, the coherence of the context, etc.

[0058] In the present invention, if there are descriptive terms with subsidiary or connecting meanings, for example, a first feature is "on" or "below" a second feature, unless otherwise clearly specified and limited, it should not be understood in a restrictive manner. For example, "on" or "below" may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above descriptive terms in the present invention can be understood according to the specific circumstances, the context, the coherence of the context, etc.

[0059] Furthermore, the first feature being “above”, “above”, and “above” the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being “below”, “below”, and “below” the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0060] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art may combine and combine the different embodiments, examples and features of the different embodiments and examples described in this specification without contradiction, and these combinations or combinations shall all fall within the scope summarized by the utility model.

[0061] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are illustrative and cannot be construed as limitations on the present invention. A person skilled in the art can change, modify, replace and modify the above embodiments within the scope of information available from public channels and in combination with the technical inspiration provided by the present application documents.

Claims

1. A hydraulic system for traveling and PTO control of agricultural machinery, characterized in that: The invention comprises an oil supply pump (1), a travel pump (2), a travel motor (3), a two-position three-way solenoid valve (4), and a PTO clutch (5); the travel pump (2) and the travel motor (3) are connected in a loop via a first oil circuit (6) and a second oil circuit (7); a first branch and a second branch are provided on the outlet pipeline of the oil supply pump (1); the first branch is connected to the first oil circuit (6) via a first non-return valve (8), and the first branch is connected to the second oil circuit (7) via a second non-return valve (9); one port of the two-position three-way solenoid valve (4) is connected to the second branch, and two ports of the two-position three-way solenoid valve (4) are connected to the PTO clutch (5).

2. The hydraulic system for agricultural machinery travel and PTO control according to claim 1, characterized in that: It also comprises an oil tank (10), the inlet pipeline of the oil supply pump (1) is connected to the oil tank (10), the oil return port of the two-position three-way solenoid valve (4) is connected to the oil tank (10), and the first branch line is also provided with an oil replenishment overflow valve (11), the outlet of the oil replenishment overflow valve (11) is connected to the oil tank (10).

3. The hydraulic system for agricultural machinery travel and PTO control according to claim 2, characterized in that: It also comprises a lubricating oil supply pipeline (12), the inlet of which is connected to a flow valve (13), and a third branch is also arranged on the outlet pipeline of the oil supply pump (1), the third branch is connected to the inlet of the flow valve (13).

4. The hydraulic system for agricultural machinery travel and PTO control according to claim 3, characterized in that: The outlet of the flow valve (13) is also connected to the oil tank (10) via a safety oil circuit, and a safety valve (14) is provided on the safety oil circuit.

5. The hydraulic system for agricultural machinery travel and PTO control according to claim 2, characterized in that: An oil suction filter (15) is also provided on the inlet pipeline of the oil supply pump (1), and a third one-way valve (16) is connected in parallel to the oil suction filter (15).

6. The hydraulic system for agricultural machinery travel and PTO control according to claim 5, characterized in that: An oil cooler (17) is also provided on the outlet pipeline of the oil supply pump (1), and the outlet of the oil cooler (17) is respectively connected to the first branch, the second branch and the third branch.

7. The hydraulic system for agricultural machinery travel and PTO control according to claim 6, characterized in that: A fourth one-way valve (18) is connected in parallel to the oil cooler (17).

8. The hydraulic system for traveling and PTO control of agricultural machinery according to claim 1, characterized in that: The first branch line is also provided with a precision filter (19), the first one-way valve (8) is connected between the outlet of the precision filter (19) and the first oil circuit (6), and the second one-way valve (9) is connected between the outlet of the precision filter (19) and the second oil circuit (7).

9. The hydraulic system for traveling and PTO control of agricultural machinery according to claim 8, characterized in that: The precision filter (19) is connected in parallel with a fifth one-way valve (20).

10. The hydraulic system for traveling and PTO control of agricultural machinery according to claim 1, characterized in that: Two one-way pressure relief valves (21) are connected between the first oil circuit (6) and the second oil circuit (7), and the directions of the two one-way pressure relief valves (21) are opposite.

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