Oil return compensation multi-path output hydraulic system for tractor and tractor
By introducing pressure compensation valves and shuttle valves into the tractor hydraulic system, load pressure signals are filtered, solving the problems of sluggish response and operational shock in the pre-valve load-sensitive system, and improving the tractor's adaptability, comfort, and safety.
Patent Information
- Application Number
- CN202520746245.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-18
- Publication Date
- 2026-02-06
- Estimated Expiration
- 2035-04-18
AI Technical Summary
The pre-valve load-sensitive system of existing high-end tractor hydraulic systems suffers from problems such as sluggish operation response, large operational impact, and severe tractor bumping or wheel-turning due to the weight of the actuators after adapting to the diversification of actuators.
Design a return oil compensation multi-output hydraulic system for tractors. By setting pressure compensation valves and shuttle valves, load pressure signals are screened, and the opening amount is adjusted by using the combination of shuttle valves and pressure compensation valves to achieve the balance of each load, thereby increasing the compatibility, comfort and safety of the tractor and the actuators.
It achieves load balance under multiple load conditions, improves the compatibility, comfort and safety of tractors and actuators, and reduces operational shock and bumps.
Smart Images
Figure CN223881472U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to hydraulic system technical field especially relates to a tractor with oil return compensation multiway output hydraulic system and tractor. BACKGROUND
[0002] The high-end tractor hydraulic system existing in the market at present is basically the load sensing system before valve, along with the diversification of tractor adaptation execution element, the shortcoming of load sensing system before valve gradually appears, load signal is too sensitive, tractor operation execution element when work impact is big, load signal reaction is slow, tractor operation operation reaction is dull, when hanging execution element turns round, execution element dead weight leads to tractor jolt or head serious. SUMMARY
[0003] The utility model provides a kind of tractor with oil return compensation multiway output hydraulic system and tractor, both meet the functional demand of existing system, and increase the operation comfort and safety of tractor.
[0004] The utility model discloses a kind of tractor with oil return compensation multiway output hydraulic system, including hydraulic oil tank and main pump, the input end of the main pump is communicated with the hydraulic oil tank, the output end of the main pump is connected with the P port of multiway output valve by pipeline, multiple valve assemblies are equipped in the multiway output valve, multiple work oil ports and control oil ports corresponding to the valve assembly are equipped on the multiway output valve;The valve assembly is connected with the pressure feedback channel of the multiway output valve by shuttle valve respectively, the oil return port of the valve assembly is connected with the oil inlet of pressure compensation valve by pipeline, the oil return port of the pressure compensation valve is communicated with the hydraulic oil tank by oil return pipe, the oil outlet of the shuttle valve transports the load pressure screened to the non-spring side control cavity of the pressure compensation valve, the load sensing oil port of the valve assembly is connected with the spring side control cavity of the pressure compensation valve by load feedback oil circuit;The pressure feedback channel of the multiway output valve is communicated with the LS control valve of the main pump by pipeline.
[0005] The utility model has the advantages that the utility model is provided with pressure compensation valve, meets the work of multiple loads simultaneously, after screening by shuttle valve, maximum pressure signal acts on pressure compensation valve, so that its opening amount is reduced, so that the balance of each load is obtained, so that the adaptability, comfort and safety of tractor and execution element are higher.
[0006] On the basis of the above technical scheme, the utility model can also be improved as follows.
[0007] Further, the hydraulic oil tank is communicated with the input end of booster pump by first pipeline, and the output end of the booster pump is communicated with the input end of main pump by second pipeline.
[0008] The beneficial effect of the further scheme is that the booster pump can provide sufficient hydraulic oil for the use of multiple actuators, meeting the pressure requirements of multiple actuators used simultaneously.
[0009] Further, the first pipeline is provided with an oil suction preliminary filtering mechanism.
[0010] The beneficial effect of the further scheme is that the oil suction preliminary filtering mechanism can preliminarily filter the hydraulic oil, avoiding the influence of impurities on the use of each valve.
[0011] Further, the second pipeline is provided with an oil suction fine filtering mechanism.
[0012] The beneficial effect of the further scheme is that the oil suction fine filtering mechanism can further purify the hydraulic oil, reducing the failure rate during the use of the hydraulic system.
[0013] Further, the oil inlet and the oil return port of the valve assembly are connected through a oil supplement pipeline, and a regenerative check valve is arranged on the oil supplement pipeline.
[0014] The beneficial effect of the further scheme is that the regenerative check valve can make part of the oil return enter the oil inlet through the oil supplement pipeline, preventing the actuator from falling too fast or generating vacuum due to gravity, preventing the actuator from falling too fast due to excessive weight, and further improving the adaptability, comfort and safety of the tractor and the actuator.
[0015] Further, the oil inlet of the valve assembly is connected to the P port of the multi-way output valve through an oil inlet pipeline, and an oil inlet check valve is arranged on the oil inlet pipeline.
[0016] The beneficial effect of the further scheme is that the oil inlet check valve can prevent the oil of the valve assembly from flowing back into the P port of the multi-way output valve due to different working oil pressures of different valve assemblies.
[0017] Further, a safety valve is arranged in the multi-way output valve, the oil inlet of the safety valve is connected to the P port of the multi-way output valve, and the oil outlet of the safety valve is connected to the oil return pipeline.
[0018] The beneficial effect of the further scheme is that the safety valve can provide overload protection for the system, and when the load exceeds the system setting value, the safety valve opens to unload, ensuring the safe operation of the system.
[0019] Further, a pressure reducing valve is arranged in the multi-way output valve, the oil inlet of the pressure reducing valve is connected to the P port of the multi-way output valve, and the oil outlet of the pressure reducing valve is connected to the oil return pipeline.
[0020] The beneficial effect of the further scheme is that the pressure reducing valve can realize pressure reduction of the system according to the requirement, and further ensure the use safety of the system.
[0021] Further, the multi-way output valve is provided with an LS interface in communication with the pressure feedback channel of the multi-way output valve, and the LS interface is in communication with the LS control valve of the main pump through a pipeline.
[0022] The beneficial effect of the further scheme is that the LS interface facilitates the communication between the LS control valve of the main pump and the pressure feedback channel of the multi-way output valve.
[0023] The tractor solves the above technical problems and comprises the oil return compensation multi-way output hydraulic system for tractors.
[0024] The beneficial effect of the scheme is that the pressure compensation valve is arranged to meet the simultaneous work of multiple loads, and the maximum pressure signal acts on the pressure compensation valve through the screening of the shuttle valve, so that the opening amount of the pressure compensation valve is reduced, the balance of the loads is achieved, and the adaptability, comfort and safety of the tractor and the execution element are higher. BRIEF DESCRIPTION OF DRAWINGS
[0025] Figure 1 The utility model discloses a structure schematic view;
[0026] In the drawings, the component list represented by each sign is as follows:
[0027] 1, oil suction primary filter mechanism;2, booster pump;3, oil suction fine filter mechanism;4, main pump;5, safety valve;6, pressure reducing valve;7, pressure compensation valve;8, load feedback oil circuit;9, shuttle valve;10, regenerative check valve;11, hydraulic oil tank;12, multi-way output valve;13, valve assembly;14, pressure feedback channel;15, oil return pipe;16, first pipeline;17, second pipeline;18, oil supplement pipeline;19, oil inlet pipe;20, oil inlet check valve;21, LS control valve;22, LS interface. DETAILED DESCRIPTION
[0028] The principles and characteristics of the utility model are described below in combination with the drawings, and the examples are only used for explaining the utility model and are not used for limiting the range of the utility model.
[0029] Embodiment one
[0030] As Figure 1As shown, the embodiment includes a hydraulic oil tank 11 and a main pump 4, the hydraulic oil tank 11 is communicated with the input end of a booster pump 2 through a first pipeline 16, the output end of the booster pump 2 is communicated with the input end of the main pump 4 through a second pipeline 17, the output end of the main pump 4 is connected with the P port of a multi-way output valve 12 through a pipeline, a plurality of valve assemblies 13 are arranged in the multi-way output valve 12, and a plurality of working oil ports and control oil ports (see A port and B port in Figure 1
[0031] In order to purify the working hydraulic oil, avoid the influence of impurities on the system, and improve the service life of the system, the first pipeline 16 is provided with an oil suction preliminary filtering mechanism 1, and the second pipeline 17 is provided with an oil suction fine filtering mechanism 3.
[0032] The valve assembly 13 is connected with the pressure feedback channel 14 of the multi-way output valve 12 through a shuttle valve 9, the oil return port of the valve assembly 13 is connected with the oil inlet port of a pressure compensation valve 7 through a pipeline, the oil return port of the pressure compensation valve 7 is communicated with the hydraulic oil tank 11 through an oil return pipe 15, the oil outlet port of the shuttle valve 9 delivers the screened load pressure to the non-spring side control cavity of the pressure compensation valve 7, and the load sensitive oil port of the valve assembly 13 is connected with the spring side control cavity of the pressure compensation valve 7 through a load feedback oil way 8; the pressure feedback channel 14 of the multi-way output valve 12 is communicated with the LS control valve 21 of the main pump 4 through a pipeline.
[0033] In the embodiment, the oil inlet port and the oil return port of the valve assembly 13 are communicated through a supplement oil pipeline 18, and a regeneration one-way valve 10 is arranged on the supplement oil pipeline 18, so that part of the oil return can enter the oil inlet port through the supplement oil pipeline 18, the gravity effect on the actuator is prevented, the vacuum is prevented, the case that the actuator falls too fast is prevented, and the adaptability, comfort and safety of the tractor and the actuator are higher.
[0034] In the preferred embodiment, the oil inlet port of the valve assembly 13 is communicated with the P port of the multi-way output valve 12 through an oil inlet pipeline 19, and an oil inlet one-way valve 20 is arranged on the oil inlet pipeline 19, so that the oil of the valve assembly 13 is prevented from flowing back into the P port of the multi-way output valve 12 due to different working oil pressures of different valve assemblies 13.
[0035] In the embodiment, the multi-way output valve 12 is provided with a safety valve 5, an oil inlet of the safety valve 5 is communicated with the P port of the multi-way output valve 12, and an oil outlet of the safety valve 5 is communicated with the oil return pipe 15; the safety valve 5 is arranged to protect the system from overload, and when the load exceeds the set value of the system, the safety valve 5 is opened to unload, thereby ensuring the safe operation of the system.
[0036] In the embodiment, the multi-way output valve 12 is provided with an LS interface 22 communicated with the pressure feedback channel 14 of the multi-way output valve 12, and the LS interface 22 is communicated with the LS control valve 21 of the main pump 4 through a pipeline; the LS interface 22 is arranged to facilitate the communication between the LS control valve 21 of the main pump 4 and the pressure feedback channel 14 of the multi-way output valve 12.
[0037] Working principle: The booster pump 2 sucks oil from the hydraulic oil tank 11 through rough oil suction filtration, and the clean hydraulic oil is pumped to the oil suction cavity of the main pump 4 through the oil suction filtration mechanism 3; the main pump 4 supplies pressure oil to the P port of the multi-way output valve 12; the safety valve 5 protects the system from overload, and when the load exceeds the set value of the system, the safety valve 5 is opened to unload, thereby ensuring the safe operation of the system; when the multi-way output valve 12 is operated to control the multi-way output, the oil inlet of the P port of the multi-way output valve 12 directly supplies oil outward through the valve core; the highest load signal screened by the shuttle valve 9 and the load feedback oil way 8 acts on both sides of the pressure compensation valve 7 to compare, thereby adjusting the size of the oil return opening of the valve core of the pressure compensation valve 7, so as to balance each load; the pressure compensation hydraulic system can prevent the rapid falling of the actuator or the generation of vacuum due to gravity by using the throttling compensation of the pressure compensation valve 7; the regenerative circuit is composed of gravity; the regenerative one-way valve 10 introduces the oil in the oil return port of the valve assembly 13 into the oil inlet of the valve assembly 13 to play the role of oil supplement; the oil return throttling compensation can prevent the rapid falling of the machine due to the heavy load, thereby making the adaptability, comfort and safety of the tractor and the actuator higher.
[0038] The pressure compensation valve 7 is arranged to meet the simultaneous work of multiple loads; the maximum pressure signal is applied to the pressure compensation valve 7 through the screening of the shuttle valve 9, so that the opening amount of the pressure compensation valve 7 is reduced, thereby balancing each load, and making the adaptability, comfort and safety of the tractor and the actuator higher.
[0039] Embodiment two
[0040] The embodiment discloses a tractor which comprises the oil return compensation multi-output hydraulic system for the tractor, satisfies simultaneous work of multiple loads, through screening of the shuttle valve 9, the maximum pressure signal acts on the pressure compensation valve 7, the opening amount of the pressure compensation valve 7 is reduced, balance of the loads is achieved, and adaptability, comfort and safety of the tractor and the executing element are higher.
[0041] In the description of the utility model, it needs to understand that the orientation or position relation indicated by the terms "center", "length", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "inner", "outer", "peripheral side", "circumferential direction" and the like is the orientation or position relation based on the drawings shown, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the system or element indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.
[0042] In the description of the utility model, the meaning of "multiple" is at least two, for example, two, three and the like, unless there is an explicit specific limitation.
[0043] In the utility model, unless there is an explicit provision and limitation, the terms "mounting", "connection", "connecting", "fixing" and the like should be understood in a broad sense, for example, can be fixed connection, or can be detachable connection, or can be integrated; can be mechanical connection, or can be electrical connection; can be directly connected, or can be indirectly connected through an intermediate medium; can be the communication inside two elements or the interaction relationship between two elements, unless there is an explicit limitation. For ordinary skilled persons in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.
[0044] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in combination with the embodiment or example are contained in at least one embodiment or example of the utility model. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, the skilled person in the art can combine and combine the different embodiments or examples described in the specification and the features of the different embodiments or examples without contradiction.
[0045] The above only describes the preferred embodiment of the utility model, and does not limit the utility model, and any modification, equivalent replacement, improvement and the like made within the spirit and principle of the utility model should be included in the protection scope of the utility model.
Claims
1. A tractor hydraulic system with oil return compensation and multiple output, characterized in that, The hydraulic oil tank (11) is connected with the input end of the booster pump (2) through the first pipeline (16), and the output end of the booster pump (2) is connected with the input end of the main pump (4) through the second pipeline (17).
2. The oil return compensated multi-output hydraulic system for tractor according to claim 1, characterized in that, The first pipeline (16) is provided with an oil suction preliminary filtering mechanism (1).
3. The oil return compensated multi-output hydraulic system for tractor according to claim 2, characterized in that, The second pipeline (17) is provided with an oil suction fine filtering mechanism (3).
4. The oil return compensated multi-output hydraulic system for tractor according to claim 2, characterized in that, The oil inlet and the oil return port of the valve assembly (13) are connected through the oil supplement pipeline (18), and the oil supplement pipeline (18) is provided with a regeneration one-way valve (10).
5. The oil return compensated multi-output hydraulic system for tractor according to claim 1, wherein, The oil inlet of the valve assembly (13) is connected with the P port of the multi-way output valve (12) through the oil inlet pipe (19), and the oil inlet pipe (19) is provided with an oil inlet one-way valve (20).
6. The oil return compensated multi-output hydraulic system for tractor as claimed in claim 5 wherein, The multi-way output valve (12) is provided with a safety valve (5), the oil inlet of the safety valve (5) is connected with the P port of the multi-way output valve (12), and the oil outlet of the safety valve (5) is connected with the oil return pipe (15).
7. The oil return compensated multi-output hydraulic system for tractor according to any one of claims 1 to 6, characterized in that, The multi-way output valve (12) is provided with a pressure reducing valve (6), the oil inlet of the pressure reducing valve (6) is connected with the P port of the multi-way output valve (12), and the oil outlet of the pressure reducing valve (6) is connected with the oil return pipe (15).
8. The oil return compensated multi-output hydraulic system for tractor according to any one of claims 1 to 6, characterized in that, The multi-way output valve (12) is provided with an LS interface (22) connected with the pressure feedback channel (14) of the multi-way output valve (12), and the LS interface (22) is connected with the LS control valve (21) of the main pump (4) through the pipeline.
9. The oil return compensated multi-output hydraulic system for tractor according to any one of claims 1 to 6, characterized in that, The hydraulic system comprises the oil return compensation multi-way output hydraulic system for the tractor according to any one of claims 1 to 9.
10. A tractor characterised in that,