An emergency steering hydraulic system and harvester

Abstract

The present application relates to a kind of emergency steering hydraulic system and harvester.Emergency steering hydraulic system includes steering cylinder, steering control valve, steering pump, walking pump and hydraulic walking power device, the two working oil ports of steering control valve are connected the large cavity and small cavity of steering cylinder respectively, the oil outlet of steering pump is connected the oil inlet of steering control valve, steering pump and walking pump shaft transmission connection, the two working oil ports of walking pump are respectively corresponding connection the two working oil ports of hydraulic walking power device, and it further includes emergency steering valve group, the two inlets of emergency steering valve group are connected the two working oil ports of walking pump respectively, and the outlet of emergency steering valve group is connected the oil inlet of steering control valve.Advantages: borrow static hydraulic walking machine type, only complete machine does not stop, the working oil port of pump will have high pressure oil, can be assisted by this pressure oil for steering control valve provides pressure oil, easily realizes steering, makes complete machine successfully stop to safe position.

Description

Technical Field

[0001] This invention relates to the field of hydraulic system technology, and in particular to an emergency steering hydraulic system and a harvester. Background Technology

[0002] Hydraulic systems are a crucial component of vehicles. Besides their role in various operational actions, they are now widely used in vehicle propulsion. For example, hydrostatic drive systems are widely adopted due to their ease of operation. Fully hydraulic steering systems are also widely used due to their labor-saving and ease of operation, while simultaneously placing higher demands on the safety of road-driving machinery.

[0003] A hydrostatic travel drive system typically includes components such as a travel pump and a travel motor. Controlled by a lever in the cab, it allows for convenient forward and reverse movement of the machine without frequent gear shifting. A fully hydraulic steering system typically includes components such as a steering pump, steering gear, and steering cylinder. Rotation of the steering wheel drives the steering gear to achieve steering. If a sudden event occurs during normal driving, causing a loss of power (engine stoppage or stall), the hydraulic power steering system will lose its power source. The driver will find it difficult to turn the steering wheel, which can easily lead to an accident. Therefore, it is necessary to add emergency power to the steering system of the work vehicle to drive the hydraulic device for emergency steering.

[0004] Therefore, it is necessary to develop a system that can provide emergency steering when a sudden event occurs during normal driving and the vehicle's power fails. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide an emergency steering hydraulic system and a harvester, which effectively overcomes the defects of the prior art.

[0006] The technical solution of the present invention to solve the above-mentioned technical problems is as follows:

[0007] An emergency steering hydraulic system includes a steering cylinder, a steering control valve, a steering pump, a travel pump, and a hydraulic travel power unit. The two working ports of the steering control valve are respectively connected to the large and small chambers of the steering cylinder. The outlet of the steering pump is connected to the inlet of the steering control valve. The return port of the steering control valve and the inlet of the steering pump are respectively connected to an oil tank. The steering pump and the travel pump are shaft-driven. The two working ports of the travel pump are respectively connected to the two working ports of the hydraulic travel power unit. The return port of the travel pump is connected to the oil tank. The system also includes an emergency steering valve assembly. The two inlets of the emergency steering valve assembly are respectively connected to the two working ports of the travel pump. The outlet of the emergency steering valve assembly is connected to the inlet of the steering control valve.

[0008] Based on the above technical solution, the present invention can be further improved as follows.

[0009] Furthermore, the aforementioned steering cylinder is provided in two parts. One working port of the aforementioned steering control valve is connected to the large chamber of one of the aforementioned steering cylinders and the small chamber of the other aforementioned steering cylinder, respectively. The other working port of the aforementioned steering control valve is connected to the small chamber of one of the aforementioned steering cylinders and the large chamber of the other aforementioned steering cylinder.

[0010] Furthermore, the aforementioned emergency steering valve assembly includes a solenoid directional valve and a shuttle valve. The two inlets of the shuttle valve are respectively connected to the two working ports of the travel pump, the outlet of the shuttle valve is connected to the inlet of the solenoid directional valve, and the working port of the solenoid directional valve is connected to the inlet of the steering control valve.

[0011] Furthermore, the aforementioned emergency steering valve assembly also includes a pressure reducing valve, the working port of the aforementioned solenoid directional valve is connected to the aforementioned pressure reducing valve, and is connected to the inlet of the aforementioned steering control valve through the aforementioned pressure reducing valve.

[0012] Furthermore, the aforementioned electromagnetic directional valve is a two-position, two-way directional valve.

[0013] Furthermore, the oil outlet of the aforementioned steering pump is connected to a check valve, and the oil inlet of the aforementioned steering control valve is connected through the check valve.

[0014] Furthermore, the aforementioned hydraulic walking power device is a hydraulic motor.

[0015] The beneficial effects of this invention are: the structure is reasonably designed, and it utilizes the hydrostatic walking machine model. As long as the whole machine does not stop, there will be high-pressure oil in the working oil port of the pump. This pressure oil can be used to provide pressure oil to the steering control valve, easily achieve steering, and make the whole machine smoothly stop in a safe position. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of one embodiment of the emergency steering hydraulic system of the present invention;

[0017] Figure 2 This is a schematic diagram of another embodiment of the emergency steering hydraulic system of the present invention.

[0018] The attached diagram lists the components represented by each number as follows:

[0019] 1. Steering cylinder; 3. Steering control valve; 4. Steering pump; 5. Travel pump; 6. Hydraulic travel power unit; 7. Emergency steering valve assembly; 41. Check valve; 71. Pressure reducing valve; 72. Solenoid directional valve; 73. Shuttle valve. Detailed Implementation

[0020] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0021] Example 1

[0022] like Figure 1 As shown, the emergency steering hydraulic system of this embodiment includes a steering cylinder 1, a steering control valve 3, a steering pump 4, a travel pump 5, and a hydraulic travel power unit 6. The two working ports of the steering control valve 3 are respectively connected to the large chamber and the small chamber of the steering cylinder 1. The oil outlet of the steering pump 4 is connected to the oil inlet of the steering control valve 3. The oil return port of the steering control valve 3 and the oil inlet of the steering pump 4 are respectively connected to the oil tank. The steering pump 4 and the travel pump 5 are shaft-driven. The two working ports of the travel pump 5 are respectively connected to the two working ports of the hydraulic travel power unit 6. The oil return port of the travel pump 5 is connected to the oil tank. The system also includes an emergency steering valve assembly 7. The two inlets of the emergency steering valve assembly 7 are respectively connected to the two working ports of the travel pump 5. The outlet of the emergency steering valve assembly 7 is connected to the oil inlet of the steering control valve 3.

[0023] During vehicle operation, high pressure is always present at one of the working ports A and B of the travel pump 5. These two ports are connected to the two inlets of the emergency steering valve assembly 7. When the engine suddenly stops or the steering pump 4 malfunctions and cannot supply pressurized oil to the steering control valve 3, the high-pressure oil is led through the emergency steering valve assembly 7 to the inlet of the steering control valve 3, providing hydraulic oil for steering and allowing the vehicle to stop smoothly at a safe position. Specifically, the entire steering hydraulic system includes a steering cylinder 1, a steering control valve 3, a steering pump 4, a travel pump 5, and a hydraulic travel power unit 6. It provides power for steering by leading the high-pressure oil from the high-pressure port of the travel pump 5 to the inlet of the steering control valve 3, thus achieving the steering function. It should be noted that the hydraulic system must be a hydrostatic travel system with a travel pump 5 and a hydraulic travel power unit 6, capable of providing power to the entire machine and driving it during normal operation.

[0024] In a preferred embodiment, the emergency steering valve assembly 7 includes a solenoid directional valve 72 and a shuttle valve 73. The two inlets of the shuttle valve 73 are respectively connected to the two working ports of the travel pump 5. The outlet of the shuttle valve 73 is connected to the inlet of the solenoid directional valve 72. The working port of the solenoid directional valve 72 is connected to the inlet of the steering control valve 3.

[0025] In the above implementation scheme, when the vehicle is moving, the high-pressure oil is led to the solenoid directional valve 72 through the shuttle valve 73. When the engine suddenly stops or the steering pump 4 is damaged and cannot provide pressure oil to the steering control valve 3, the solenoid directional valve 72 is energized and leads the pressure oil to the oil inlet (i.e., P port) of the steering control valve 3 to provide steering hydraulic oil, so that the whole machine can stop smoothly to a safe position.

[0026] In a preferred embodiment, the emergency steering valve assembly 7 further includes a pressure reducing valve 71, the working port of the solenoid directional valve 72 is connected to the pressure reducing valve 71, and the pressure reducing valve 71 is connected to the inlet of the steering control valve 3.

[0027] In the above implementation scheme, the pressure reducing valve 71 can effectively limit the pressure entering the steering control valve 3, avoid damage to the steering control valve 3, and stabilize the input pressure.

[0028] In this embodiment, the aforementioned electromagnetic directional valve 72 adopts a two-position, two-way directional valve of existing technology, which can effectively switch on and off the pressure oil. Specific models can be flexibly selected according to actual usage requirements, and will not be elaborated here.

[0029] In a preferred embodiment, the oil outlet of the steering pump 4 is connected to a one-way valve 41, and the oil inlet of the steering control valve 3 is connected through the one-way valve 41.

[0030] In the above implementation scheme, the design of the one-way valve 41 effectively prevents the return from the emergency steering valve assembly 7 to the steering pump 4, avoiding unnecessary leakage. It should be further noted that the oil outlet of the steering pump 4 is connected to the oil inlet of the steering control valve 3 via a pipeline, and the outlet of the emergency steering valve assembly 7 is connected to a pipeline, with the one-way valve 41 located between the oil outlet of the steering pump 4 and the outlet connection pipeline of the emergency steering valve assembly 7.

[0031] In this embodiment, the hydraulic walking power device 6 uses a hydraulic motor based on existing technology. The specific model can be flexibly selected according to actual usage requirements, and will not be elaborated here.

[0032] Example 2

[0033] like Figure 2As shown, the emergency steering hydraulic system of this embodiment includes two steering cylinders 1, a steering control valve 3, a steering pump 4, a travel pump 5, and a hydraulic travel power unit 6. The two working ports of the steering control valve 3 are respectively connected to the large and small chambers of the steering cylinders 1. The outlet of the steering pump 4 is connected to the inlet of the steering control valve 3. The return port of the steering control valve 3 and the inlet of the steering pump 4 are respectively connected to the oil tank. The steering pump 4 is shaft-driven to the travel pump 5. The two working ports of the travel pump 5 are respectively connected one-to-one to the two ports of the hydraulic travel power unit 6. The travel pump 5 has a working oil port, and its return oil port is connected to the oil tank. It also includes an emergency steering valve assembly 7. The two inlets of the emergency steering valve assembly 7 are respectively connected to the two working oil ports of the travel pump 5. The outlet of the emergency steering valve assembly 7 is connected to the inlet of the steering control valve 3. One working oil port of the steering control valve 3 is respectively connected to the large chamber of one of the steering cylinders 1 and the small chamber of the other steering cylinder 1. The other working oil port of the steering control valve 3 is respectively connected to the small chamber of one of the steering cylinders 1 and the large chamber of the other steering cylinder 1.

[0034] Everything else is the same as in Example 1, and the working principle is as detailed in Example 1, so it will not be repeated here. The difference is that Example 1 uses a single steering cylinder to drive the steering, while Example 2 uses a double steering cylinder to drive the steering.

[0035] Example 3

[0036] The harvester of this embodiment includes an emergency steering hydraulic system as in Embodiment 1 or Embodiment 2.

[0037] In the description of this invention, 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," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0038] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0039] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0040] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0041] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0042] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. An emergency steering hydraulic system, comprising a steering cylinder (1), a steering control valve (3), a steering pump (4), a travel pump (5), and a hydraulic travel power unit (6), wherein the two working ports of the steering control valve (3) are respectively connected to the large chamber and the small chamber of the steering cylinder (1), the oil outlet of the steering pump (4) is connected to the oil inlet of the steering control valve (3), the oil return port of the steering control valve (3) and the oil inlet of the steering pump (4) are respectively connected to an oil tank, the steering pump (4) is shaft driven to the travel pump (5), the two working ports of the travel pump (5) are respectively connected to the two working ports of the hydraulic travel power unit (6), and the oil return port of the travel pump (5) is connected to the oil tank, characterized in that: It also includes an emergency steering valve assembly (7), the two inlets of which are respectively connected to the two working oil ports of the travel pump (5), and the outlet of the emergency steering valve assembly (7) is connected to the oil inlet of the steering control valve (3); The emergency steering valve assembly (7) includes a solenoid directional valve (72) and a shuttle valve (73). The two inlets of the shuttle valve (73) are respectively connected to the two working ports of the travel pump (5). The outlet of the shuttle valve (73) is connected to the inlet of the solenoid directional valve (72). The working port of the solenoid directional valve (72) is connected to the inlet of the steering control valve (3).

2. The emergency steering hydraulic system according to claim 1, characterized in that: The steering cylinder (1) is provided in two parts. One working port of the steering control valve (3) is connected to the large chamber of one steering cylinder (1) and the small chamber of the other steering cylinder (1). The other working port of the steering control valve (3) is connected to the small chamber of one steering cylinder (1) and the large chamber of the other steering cylinder (1).

3. The emergency steering hydraulic system according to claim 1, characterized in that: The emergency steering valve assembly (7) also includes a pressure reducing valve (71), the working port of the solenoid directional valve (72) is connected to the pressure reducing valve (71), and the pressure reducing valve (71) is connected to the inlet of the steering control valve (3).

4. The emergency steering hydraulic system according to claim 1, characterized in that: The electromagnetic reversing valve (72) is a two-position two-way reversing valve.

5. The emergency steering hydraulic system according to claim 1, characterized in that: The oil outlet of the steering pump (4) is connected to a check valve (41), and the oil inlet of the steering control valve (3) is connected through the check valve (41).

6. The emergency steering hydraulic system according to claim 1, characterized in that: The hydraulic walking power device (6) is a hydraulic motor.

7. A harvester, characterized in that: Includes the emergency steering hydraulic system as described in any one of claims 1 to 6.

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