Suspension front axle hydraulic system for tractor and tractor with suspension front axle hydraulic system
By designing the hydraulic system of suspended front axle for tractors, the problems of poor transportation capacity and ride comfort of traditional tractor front axle on uneven roads are solved, and flexible adjustment of the height and stiffness of suspended front axle is achieved, and stability and control convenience are improved.
Patent Information
- Application Number
- CN202422651166.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-31
- Publication Date
- 2025-08-01
- Estimated Expiration
- 2034-10-31
AI Technical Summary
The traditional tractor front axle adopts a rigid structure, which leads to poor transportation capacity and poor riding comfort on uneven roads. The existing suspended front axle height and stiffness adjustment control is inconvenient and has low stability.
A hydraulic system for suspended front axle for tractors is designed, including suspended oil cylinder, oil inlet pipeline, oil return pipeline and energy storage device. By setting up a poppet valve, a drop valve, a boost valve and a pressure reducing valve, automatic or manual adjustment of the height and stiffness of the suspended front axle is achieved.
It realizes flexible adjustment of the height and stiffness of the suspended front axle, with simple structure, convenient control, and high stability, improving transportation capacity and riding comfort.
Smart Images
Figure CN223173905U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of agricultural machinery equipment, in particular to a hydraulic system for a floating front axle of a tractor and a tractor with the same. Background Art
[0002] Most of the front axles of traditional tractors adopt rigid front axles and cannot float and change. In places with uneven roads, problems such as poor transportation capacity and poor riding comfort are likely to occur.
[0003] With the development and progress of agricultural machinery equipment, a small number of tractor front axles have gradually adopted floating front axles, specifically using floating cylinders for height adjustment. However, in the existing technology, there are problems of inconvenient control and low stability in the adjustment process of the height and stiffness of the floating front axle, and the subsequent use requirements cannot be met.
[0004] Based on this, it is necessary to develop a hydraulic system for a floating front axle of a tractor to overcome the above technical problems. Summary of the Utility Model
[0005] The technical problem to be solved by the utility model is to provide a hydraulic system for a floating front axle of a tractor and a tractor with the same, which effectively overcomes the defects of the prior art.
[0006] The technical solution for the utility model to solve the above technical problems is as follows:
[0007] A hydraulic system for a floating front axle of a tractor includes a floating cylinder, a large chamber oil inlet pipeline, a small chamber oil inlet pipeline, a large chamber oil return pipeline and a small chamber oil return pipeline. One end of the large chamber oil inlet pipeline is connected to the large chamber interface of the floating cylinder, and the other end is connected to the outlet of the pump. The inlet of the pump is connected to the fuel tank. One end of the small chamber oil inlet pipeline is connected to the small chamber interface of the floating cylinder, and the other end is connected to the outlet of the pump. One end of the large chamber oil return pipeline is connected to the fuel tank, and the other end is connected to the large chamber interface of the floating cylinder. One end of the small chamber oil return pipeline is connected to the fuel tank, and the other end is connected to the small chamber interface of the floating cylinder. The large chamber interface of the floating cylinder is connected to a first accumulator, and the small chamber interface of the floating cylinder is connected to a second accumulator. A lifting valve is provided on the large chamber oil inlet pipeline, a boosting valve is provided on the small chamber oil inlet pipeline, a lowering valve is provided on the large chamber oil return pipeline, and a pressure reducing valve is provided on the small chamber oil return pipeline. The large chamber oil inlet pipeline and the small chamber oil inlet pipeline are respectively connected to the inlets of a shuttle valve through pipelines, and the outlet of the shuttle valve is connected to the LS control port of the pump through a pipeline.
[0008] On the basis of the above technical solution, the utility model can also be improved as follows.
[0009] Further, there are two such suspension oil cylinders. One end of the large chamber oil inlet pipeline is respectively connected to the large chamber interfaces of the two suspension oil cylinders, one end of the small chamber oil inlet pipeline is respectively connected to the small chamber interfaces of the two suspension oil cylinders, the other end of the large chamber oil return pipeline is respectively connected to the large chamber interfaces of the two suspension oil cylinders, and the other end of the small chamber oil return pipeline is respectively connected to the small chamber interfaces of the two suspension oil cylinders.
[0010] Further, there is one such second accumulator, which is respectively connected to the small chamber interfaces of the two suspension oil cylinders through pipelines.
[0011] Further, a pressure monitor is provided at the connection of the second accumulator and the pipeline.
[0012] Further, a first filter is provided on the large chamber oil inlet pipeline, a second filter is provided on the small chamber oil inlet pipeline, a third filter is provided on the large chamber oil return pipeline, and a fourth filter is provided on the small chamber oil return pipeline.
[0013] Further, throttle valves are respectively provided on the large chamber oil inlet pipeline, the small chamber oil inlet pipeline, the large chamber oil return pipeline, and the small chamber oil return pipeline.
[0014] Further, the large chamber interface of the suspension oil cylinder is also connected to the fuel tank through an overflow pipe, and an overflow valve is provided on the overflow pipe.
[0015] Further, check valves are respectively provided on the large chamber oil inlet pipeline, the small chamber oil inlet pipeline, the large chamber oil return pipeline, and the small chamber oil return pipeline.
[0016] Further, the pump is a variable pump.
[0017] The beneficial effects of the present utility model are as follows: The structure design is simple and reasonable, and it can adjust the height and stiffness of the suspended front axle according to the load of the tractor's front axle. At the same time, the lift valve, the lowering valve, the boosting valve, and the pressure reducing valve are respectively set, and the control is relatively convenient and the stability is high.
[0018] There is also provided a tractor, including a hydraulic system for the suspended front axle of the tractor. Description of the Drawings
[0019] Figure 1 It is a schematic diagram of the use state of the hydraulic system for the suspended front axle of the tractor of the present utility model Figure 1 ;
[0020] Figure 2 It is a schematic diagram of the use state of the hydraulic system for the suspended front axle of the tractor of the present utility model Figure 2 ;
[0021] Figure 3 It is a schematic diagram of the use state of the hydraulic system for the suspended front axle of the tractor of the present utility model Figure 3 ;
[0022] Figure 4 Schematic diagram of the operating state of the suspension front axle hydraulic system for tractors of the present utility model Figure 4 ;
[0023] Figure 5 Schematic diagram of the operating state of the suspension front axle hydraulic system for tractors of the present utility model Figure 5 。
[0024] In the attached drawings, the list of components represented by each reference numeral is as follows:
[0025] 1. Suspension cylinder; 2. Large chamber inlet pipeline; 3. Small chamber inlet pipeline; 4. Large chamber return pipeline; 5. Small chamber return pipeline; 6. First accumulator; 7. Second accumulator; 8. Shuttle valve; 9. Relief valve; 21. Lift valve; 22. First filter; 31. Booster valve; 32. Second filter; 41. Lowering valve; 42. Third filter; 51. Pressure reducing valve; 52. Fourth filter; 71. Pressure monitor. Specific embodiments
[0026] The principles and features of the present utility model will be described below in conjunction with the attached drawings. The examples given are only for explaining the present utility model and are not intended to limit the scope of the present utility model.
[0027] Embodiment 1
[0028] As shown in Figure 1 、 2 、3, 4, and 5, the suspension front axle hydraulic system for tractors in this embodiment includes a suspension cylinder 1, a large chamber inlet pipeline 2, a small chamber inlet pipeline 3, a large chamber return pipeline 4, and a small chamber return pipeline 5. One end of the above-mentioned large chamber inlet pipeline 2 is connected to the large chamber interface of the above-mentioned suspension cylinder 1, and the other end is connected to the outlet of the pump. The inlet of the above-mentioned pump is connected to the fuel tank. One end of the above-mentioned small chamber inlet pipeline 3 is connected to the small chamber interface of the above-mentioned suspension cylinder 1, and the other end is connected to the outlet of the pump. One end of the above-mentioned large chamber return pipeline 4 is connected to the fuel tank, and the other end is connected to the large chamber interface of the above-mentioned suspension cylinder 1. One end of the above-mentioned small chamber return pipeline 5 is connected to the fuel tank, and the other end is connected to the small chamber interface of the above-mentioned suspension cylinder 1. The large chamber interface of the above-mentioned suspension cylinder 1 is connected to the first accumulator 6, and the small chamber interface of the above-mentioned suspension cylinder 1 is connected to the second accumulator 7. A lift valve 21 is provided on the above-mentioned large chamber inlet pipeline 2, a booster valve 31 is provided on the above-mentioned small chamber inlet pipeline 3, a lowering valve 41 is provided on the above-mentioned large chamber return pipeline 4, and a pressure reducing valve 51 is provided on the above-mentioned small chamber return pipeline 5. The above-mentioned large chamber inlet pipeline 2 and the small chamber inlet pipeline 3 are respectively connected to the inlet of the shuttle valve 8 through pipelines, and the outlet of the shuttle valve 8 is connected to the LS control port of the pump through a pipeline.
[0029] The specific process of using the suspension front axle hydraulic system for tractors in this embodiment is as follows:
[0030] Automatic mode: In the automatic mode, the system can automatically adjust the height of the front axle and the pressure of the suspension cylinder 1 according to the tractor load and road conditions. When the suspension cylinder 1 exceeds its stroke position by 50% (+ / -5%), the control system will adjust the pressure of the large and small chambers of the suspension cylinder 1 and perform the suspension control function. Specific implementation process: When the automatic mode switch is pressed or the vehicle speed exceeds a specific value, the suspension cylinder 1, the first accumulator 6, and the second accumulator 7 jointly perform the suspension control function. When the suspension requires oil replenishment, the accumulator supplies oil (the large chamber is replenished by the first accumulator 6, and the small chamber is replenished by the second accumulator 7, and the lift valve 21 and the booster valve 31 are both de-energized and open). When the oil in the suspension cylinder 1 is discharged, the accumulator absorbs the oil (the first accumulator 6 absorbs the oil discharged from the large chamber, and the second accumulator 7 absorbs the oil discharged from the small chamber). After the system has been stable for a certain period of time, if the system detects the pressure in the large chamber of the suspension cylinder 1, the lift valve 21 is energized at this time to make the large chamber inlet pipeline 2 unblocked, and the pressure oil will enter the large chamber of the suspension cylinder 1, so that the front axle height is stabilized at 50% (+ / -5%) of the cylinder stroke position.
[0031] Manual mode: In the manual mode, the system can adjust the height of the front axle according to the user's needs. Specific implementation process: When it is necessary to raise the height of the front axle, the lift valve 21 can be controlled to be energized, and the oil enters the large chamber inlet pipeline 2 through the pump (that is, the P port in the figure), and enters the large chamber of the suspension cylinder 1 through the lift valve 21, thereby realizing the increase in the front axle height (as Figure 2 shown). When it is necessary to lower the height of the front axle, the lowering valve 41 can be controlled to be energized, and the oil in the large chamber flows back into the fuel tank (as Figure 3 shown).
[0032] Of course, the height and stiffness of the suspension bridge can also be adjusted by pressurizing or decompressing the small chamber. Specifically, during pressurization (as Figure 4 shown), the oil enters the small chamber inlet pipeline 3 through the P port, and then enters the small chamber of the suspension cylinder 1, thereby realizing the lowering of the front axle height. The pipeline where the shuttle valve 8 is located continuously feeds back the small chamber pressure information. During this process, the load pressure in the small chamber is fed back to the pump through the shuttle valve 8 and the pipeline, and the pressure and flow can be adjusted adaptively according to the load. At the same time, this process is also for... During decompression (as Figure 5 shown), the pressure reducing valve 51 is energized, and the oil in the small chamber returns to the fuel tank through the small chamber return pipeline 5.
[0033] Overall, the structural design is simple and reasonable, and it can adjust the height and stiffness of the suspended front axle according to the load of the tractor's front axle. At the same time, the lift valve, lowering valve, booster valve, and pressure reducing valve are respectively set, and the control is relatively convenient and the stability is high.
[0034] It should be supplemented and explained that: Figures 1-5 The thick black lines refer to partially unblocked hydraulic routes.
[0035] As a preferred embodiment, two of the above-mentioned suspension cylinders 1 are provided. One end of the large chamber oil inlet pipeline 2 is respectively connected to the large chamber interfaces of the two suspension cylinders 1, one end of the small chamber oil inlet pipeline 3 is respectively connected to the small chamber interfaces of the two suspension cylinders 1, the other end of the large chamber oil return pipeline 4 is respectively connected to the large chamber interfaces of the two suspension cylinders 1, and the other end of the small chamber oil return pipeline 5 is respectively connected to the small chamber interfaces of the two suspension cylinders 1.
[0036] In the above-mentioned implementation scheme, two suspension cylinders 1 are adopted, and the double cylinders realize the stable lifting of the front axle.
[0037] In this embodiment, one of the above-mentioned second accumulators 7 is provided and is respectively connected to the small chamber interfaces of the two suspension cylinders 1 through pipelines. The two cylinders share one second accumulator 7, which simplifies the structural design and makes it more compact.
[0038] In this embodiment, a pressure monitor 71 is provided at the connection between the second accumulator 7 and the pipeline. The pressure change of the second accumulator 7 and the pipeline is monitored in real time through the pressure monitor 71 to ensure effective monitoring of this hydraulic circuit.
[0039] In this embodiment, a first filter 22 is provided on the large chamber oil inlet pipeline 2, a second filter 32 is provided on the small chamber oil inlet pipeline 3, a third filter 42 is provided on the large chamber oil return pipeline 4, and a fourth filter 52 is provided on the small chamber oil return pipeline 5. Filters are provided on each main pipeline, which can effectively filter impurities in the oil and avoid damage to components caused by impurities.
[0040] In this embodiment, throttle valves are respectively provided on the large chamber oil inlet pipeline 2, the small chamber oil inlet pipeline 3, the large chamber oil return pipeline 4 and the small chamber oil return pipeline 5.
[0041] As a preferred embodiment, the large chamber interface of the above-mentioned suspension cylinder 1 is also connected to the fuel tank through an overflow pipe, and an overflow valve 9 is provided on the overflow pipe.
[0042] In the above-mentioned implementation scheme, when the load in the large chamber of the suspension cylinder 1 exceeds the spring pressure of the overflow valve 9, the oil in the large chamber will flow back to the fuel tank through the overflow valve 9, thereby protecting the system components.
[0043] In this embodiment, check valves are respectively provided on the large chamber oil inlet pipeline 2, the small chamber oil inlet pipeline 3, the large chamber oil return pipeline 4 and the small chamber oil return pipeline 5. The design of the check valve limits the flow direction of the oil in the pipeline where it is located and avoids reverse flow.
[0044] In this embodiment, the above-mentioned pump adopts a variable pump of a suitable model.
[0045] Embodiment 2
[0046] The tractor of this embodiment includes the hydraulic system of the suspended front axle for tractors in Embodiment 1.
[0047] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.
[0048] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.
[0049] In the present invention, unless otherwise clearly defined and limited, the terms "mounted", "connected", "connected to", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0050] In the present invention, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "under" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.
[0051] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.
[0052] Although the embodiments of the present utility model have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present utility model. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present utility model.
Claims
1. A hydraulic system for a suspended front axle of a tractor, characterized in that: It includes a suspension oil cylinder (1), a large chamber oil inlet pipeline (2), a small chamber oil inlet pipeline (3), a large chamber oil return pipeline (4) and a small chamber oil return pipeline (5). One end of the large chamber oil inlet pipeline (2) is connected to the large chamber interface of the suspension oil cylinder (1), and the other end is connected to the outlet of the pump. The inlet of the pump is connected to the fuel tank. One end of the small chamber oil inlet pipeline (3) is connected to the small chamber interface of the suspension oil cylinder (1), and the other end is connected to the outlet of the pump. One end of the large chamber oil return pipeline (4) is connected to the fuel tank, and the other end is connected to the large chamber interface of the suspension oil cylinder (1). One end of the small chamber oil return pipeline (5) is connected to the fuel tank, and the other end is connected to the small chamber interface of the suspension oil cylinder (1). The large chamber interface of the suspension oil cylinder (1) is connected to a first accumulator (6), and the small chamber interface of the suspension oil cylinder (1) is connected to a second accumulator (7). A lift valve (21) is provided on the large chamber oil inlet pipeline (2), a pressure booster valve (31) is provided on the small chamber oil inlet pipeline (3), a lowering valve (41) is provided on the large chamber oil return pipeline (4), and a pressure reducing valve (51) is provided on the small chamber oil return pipeline (5). The large chamber oil inlet pipeline (2) and the small chamber oil inlet pipeline (3) are respectively connected to the inlets of a shuttle valve (8) through pipelines, and the outlet of the shuttle valve (8) is connected to the LS control port of the pump through a pipeline.
2. The hydraulic system of the suspension front axle for a tractor according to claim 1, wherein: There are two suspension oil cylinders (1). One end of the large chamber oil inlet pipeline (2) is respectively connected to the large chamber interfaces of the two suspension oil cylinders (1), one end of the small chamber oil inlet pipeline (3) is respectively connected to the small chamber interfaces of the two suspension oil cylinders (1), the other end of the large chamber oil return pipeline (4) is respectively connected to the large chamber interfaces of the two suspension oil cylinders (1), and the other end of the small chamber oil return pipeline (5) is respectively connected to the small chamber interfaces of the two suspension oil cylinders (1).
3. The hydraulic system of a suspended front axle for a tractor according to claim 2, characterized in that: There is one second accumulator (7), and it is respectively connected to the small chamber interfaces of the two suspension oil cylinders (1) through pipelines.
4. A hydraulic system for a suspended front axle of a tractor according to claim 3, characterized in that: A pressure monitor (71) is provided at the connection of the second accumulator (7) and the pipeline.
5. A hydraulic system for a suspended front axle of a tractor according to claim 1, characterized in that: A first filter (22) is provided on the large chamber oil inlet pipeline (2), a second filter (32) is provided on the small chamber oil inlet pipeline (3), a third filter (42) is provided on the large chamber oil return pipeline (4), and a fourth filter (52) is provided on the small chamber oil return pipeline (5).
6. The hydraulic system of a suspended front axle for a tractor according to claim 1, wherein: Throttle valves are respectively provided on the large chamber oil inlet pipeline (2), the small chamber oil inlet pipeline (3), the large chamber oil return pipeline (4) and the small chamber oil return pipeline (5).
7. A hydraulic system for a suspended front axle of a tractor according to claim 1, characterized in that: The large chamber interface of the suspension oil cylinder (1) is also connected to the fuel tank through an overflow pipe, and an overflow valve (9) is provided on the overflow pipe.
8. A hydraulic system for a suspended front axle of a tractor according to claim 1, characterized in that: Check valves are respectively provided on the large chamber oil inlet pipeline (2), the small chamber oil inlet pipeline (3), the large chamber oil return pipeline (4) and the small chamber oil return pipeline (5).
9. A hydraulic system for a suspended front axle of a tractor according to any one of claims 1 to 8, characterized in that: The pump is a variable pump.
10. A tractor, characterized in that: It includes a hydraulic system for a suspended front axle of a tractor as described in any one of claims 1 to 9.