Anti-skid diverter valve group, hydrostatic four-wheel drive system and agricultural machinery

Abstract

The utility model belongs to the field of agricultural machinery, and discloses an anti-skid diverter valve group, a hydrostatic four-wheel drive system and agricultural machinery. The anti-skid diverter valve set is provided with a main oil inlet, a first working oil port, a second working oil port and a diverter valve, and bypass oil ways are arranged at the two ends of the diverter valve. The control valve is used for controlling hydraulic oil of the main oil inlet to be shunted to the first working oil port and the second working oil port through the diverter valve, or controlling the hydraulic oil of the main oil inlet to flow to the first working oil port and the second working oil port through the bypass oil way; and the pressure fine adjustment valve is arranged behind the diverter valve and is hydraulically connected with the first working oil port and the second working oil port. Whether hydraulic oil of the main oil inlet needs to be forcibly shunted or not can be controlled through the control valve, and when shunting is needed, the flow of the front drive motor and the flow of the rear drive motor can be forcibly shunted through the diverter valve so as to enhance the anti-skid effect; moreover, by arranging the pressure fine adjustment valve, the split ratio of the split hydraulic oil can be adjusted in a self-adaptive mode, and the purposes of reducing vibration and impact, reducing pressure loss and saving energy can be achieved.

Description

Technical Field

[0001] This application belongs to the field of agricultural machinery, specifically relating to an anti-slip diverter valve assembly, a hydrostatic four-wheel drive system, and agricultural machinery. Background Technology

[0002] Hydrostatic four-wheel drive systems are commonly used in agricultural machinery such as harvesters. However, agricultural machinery is prone to slippage in fields and cold, icy areas. Slipping tires significantly reduce the pressure of the hydrostatic drive system, greatly increasing flow consumption and preventing other hydraulic motors from working, making it extremely difficult to get the machinery out of trouble. To address this, existing technologies employ front and rear axle flow separation control in slippage situations, but this inevitably leads to significant system pressure loss and poor energy efficiency. Summary of the Invention

[0003] The purpose of this application is to provide an anti-slip diverter valve assembly, a hydrostatic four-wheel drive system, and agricultural machinery to solve the slippage problem with low pressure loss and high energy efficiency.

[0004] To achieve the above objectives, according to a first aspect of this application, an anti-slip diversion valve assembly is provided, the anti-slip diversion valve assembly having a main oil inlet, a first working oil port, and a second working oil port, and comprising:

[0005] A flow divider valve, wherein both ends of the flow divider valve are provided with bypass oil passages;

[0006] A control valve is used to control the hydraulic oil in the main inlet to be diverted to the first working port and the second working port via the diversion valve, or to control the hydraulic oil in the main inlet to flow to the first working port and the second working port via the bypass oil passage.

[0007] A pressure fine-tuning valve is located after the diverter valve and hydraulically connected to the first working port and the second working port.

[0008] In some embodiments, the pressure fine-tuning valve is a throttling orifice.

[0009] In some embodiments, the pressure fine-tuning valve is an adjustable throttle valve.

[0010] In some embodiments, the control valve includes a reversing valve, one side of which is connected to the main inlet, and the other side includes a diversion port connected to the diversion valve and a bypass port connected to the bypass circuit. The reversing valve is used to switch the connection of the main inlet to the diversion port or the bypass port.

[0011] In some embodiments, the directional valve is a hydraulically controlled valve, and the control valve includes a return port, a pilot port, a control port, and a solenoid valve corresponding to the control port. The control port is connected to the hydraulically controlled end of the directional valve, and the solenoid valve is used to hydraulically connect the control port to the return port or the pilot port.

[0012] In some embodiments, the anti-slip diverter valve assembly further includes an overflow valve disposed between the first working port and the pilot port, and between the second working port and the pilot port.

[0013] In some embodiments, the anti-slip diversion valve assembly further includes a replenishing check valve, which is connected in parallel with the overflow valve between the first working port and the pilot port, and between the second working port and the pilot port.

[0014] According to a second aspect of this application, a hydrostatic four-wheel drive system is also provided, the hydrostatic four-wheel drive system including the aforementioned anti-slip diverter valve assembly.

[0015] In some embodiments, the hydrostatic four-wheel drive system includes:

[0016] A traveling pump is connected to the main oil inlet;

[0017] A front axle motor and a rear axle motor, one of which is connected to the first working oil port and the other is connected to the second working oil port.

[0018] According to a third aspect of this application, an agricultural machine is also provided, the agricultural machine including the above-described hydrostatic four-wheel drive system.

[0019] In the anti-slip flow divider valve assembly of this application, the control valve can be used to control whether the hydraulic oil at the main inlet needs to be forcibly divided. When flow division is required, the flow divider valve can be used to forcibly divide the flow of the front and rear drive motors to enhance the anti-slip effect and improve the passability of agricultural machinery. Moreover, by setting a pressure fine-tuning valve, the hydraulic oil after diversion can adaptively fine-tune the flow division ratio, which can reduce pressure loss and save energy. For example, agricultural machinery can appropriately adjust the flow division ratio under different road conditions to reduce vibration and impact and improve stability.

[0020] Other advantages of this application and the technical effects of preferred embodiments will be further described in the detailed embodiments below. Attached Figure Description

[0021] The accompanying drawings are provided to further illustrate the embodiments of this application and form part of the specification. They are used together with the following detailed description to explain the embodiments of this application, but do not constitute a limitation on the embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without any inventive effort. In the drawings:

[0022] Figure 1 Hydraulic schematic diagram of anti-slip diversion valve assembly for existing agricultural machinery;

[0023] Figure 2 This is a hydraulic schematic diagram of an anti-slip diverter valve assembly according to a specific embodiment of this application.

[0024] Explanation of reference numerals in the attached figures

[0025] 1. Solenoid valve 2. Relief valve

[0026] 3. Oil replenishment check valve; 4. Throttling orifice

[0027] 5. Flow divider valve 6. Directional control valve

[0028] 7 Safety valve 8 Damping orifice

[0029] 9. Hydraulic directional valve 10. Solenoid directional valve

[0030] 11 Check valve

[0031] A. First working oil port B. Second working oil port

[0032] P Main oil inlet T Return oil inlet

[0033] G pilot port L bypass oil passage Detailed Implementation

[0034] The specific embodiments of this application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this application. It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0035] The anti-slip diverter valve assembly, hydrostatic four-wheel drive system, and agricultural machinery of this application will be described in detail below with reference to the accompanying drawings and embodiments.

[0036] This application discloses a novel anti-slip flow divider valve assembly. For example... Figure 2 As shown, in one specific embodiment, the anti-slip diverter valve assembly is provided with a main oil inlet P, a first working oil inlet A, and a second working oil inlet B, and includes:

[0037] Diverter valve 5, with bypass oil passages L at both ends;

[0038] The control valve is used to control the hydraulic oil in the main inlet P to be diverted to the first working port A and the second working port B via the diverter valve 5, or to control the hydraulic oil in the main inlet P to flow to the first working port A and the second working port B via the bypass oil passage L.

[0039] A pressure fine-tuning valve is located after the flow divider valve 5 and is hydraulically connected to the first working port A and the second working port B.

[0040] This application addresses the anti-slip function of a hydraulic four-wheel drive system for agricultural machinery. In the anti-slip flow divider valve assembly of this application, the flow rate of the front and rear drive motors can be forcibly divided via the flow divider valve 5 to enhance the anti-slip effect and expand its applicability. A control valve used to control the flow divider valve 5 can control whether the hydraulic oil at the main inlet P is forcibly divided, thereby adapting to slipping or non-slipping operating conditions. See also... Figure 2 When solenoid valve 1 is energized, the pressure oil at pilot port G acts on directional valve 6, closing the bypass oil circuit L. The pressure oil at main inlet port P is then forced to flow proportionally through flow divider valve 5, ensuring that pressure is always present at first working port A and second working port B to drive the motor. When solenoid valve 1 is de-energized, the pressure oil at main inlet port P flows from bypass oil circuit L to first working port A and second working port B, bypassing flow divider valve 5.

[0041] Specifically, by setting a pressure fine-tuning valve, the hydraulic oil after diversion can adaptively fine-tune the diversion ratio, thereby reducing pressure loss and saving energy. When hydraulic oil is supplied to the first working port A and the second working port B through the diversion valve 5, if the load of the front and rear motors changes, the diversion ratio can be appropriately adjusted by the pressure fine-tuning valve to reduce hydraulic shock and pressure loss, making the system more stable and more energy-efficient.

[0042] Comparable, in Figure 1 In the anti-slip diverter valve assembly shown, after pressurized oil enters the valve assembly from port A1, when the system detects slippage in the four-wheel drive hydraulic system, the solenoid directional valve 10 is energized. The pressurized oil entering from port Ps pushes the valve core of the hydraulic directional valve 9 to the right through the solenoid directional valve 10, forcing the pressurized oil from port A1 to be supplied to port B1 through the damping orifice 8. Due to the throttling effect, the hydraulic oil builds pressure in the system through the damping orifice 8, causing the motor to generate driving force to solve the slippage problem. When the solenoid directional valve 10 is not energized, the pressurized oil directly enters from port A1 to supply oil to port B1. In addition, the valve assembly also includes a safety valve 7 for protection and a check valve 11 connected to the hydraulic oil tank for replenishment.

[0043] In existing technologies, the method of using a damping orifice to re-establish pressure in a slipping hydraulic system to drive the motor can solve the slippage problem to some extent. However, the damping orifice 8 is located in the oil supply line, resulting in significant oil loss before and after the orifice and poor stability. Moreover, the anti-slip effect of re-establishing pressure through the damping orifice 8 varies under different flow rates, making it less applicable. In contrast, this application uses a flow divider valve 5 to achieve forced flow division, which has wider applicability. Figure 1 In the previous method, the pressurized and unpressurized pipelines were directly connected through a damping orifice. However, this application separates the pressurized and unpressurized chambers through a diverter valve 5 and a throttling orifice 4, resulting in better stability.

[0044] It should be noted that the diverter valve 5 mentioned here is well known to those skilled in the art, and its structure and function will not be described in detail here. Diverter valves and their control valves have various structural forms and are not limited to these. Figure 2 The structural form shown will be discussed further below.

[0045] Among them, the pressure fine-tuning valve can be adopted Figure 2 The throttle orifice 4 is shown in the diagram. In the event of slippage, the flow rate and pressure between the first working port A and the second working port B after the flow is split can be finely adjusted through the throttle orifice 4, allowing the agricultural machinery to appropriately adjust the flow split ratio under different road conditions, reducing vibration and impact, and improving stability.

[0046] Of course, pressure fine-tuning valves can also have other structural forms, such as other structural forms of throttle valves, especially adjustable throttle valves.

[0047] As those skilled in the art will understand, control valves also have various structural forms. As an example, Figure 2 The control valves include a directional valve 6. One port of the directional valve 6 is connected to the main inlet port P, and the other port includes a diversion port connected to the diversion valve 5 and a bypass port connected to the bypass oil circuit L. The directional valve 6 is used to switch the connection between the main inlet port P and the diversion port or the bypass port. See also Figure 2 When the directional valve 6 is switched to the lower position, the main inlet P is connected to the bypass port and also to the diverter port (of course, the main inlet P and the diverter port can also be cut off). Due to the back pressure of the diverter valve 5, the hydraulic oil in the main inlet P does not pass through the diverter valve 5 at all, but is connected to the first working port A through the upper bypass oil passage L, and to the second working port B through the lower bypass oil passage L, that is, without forced diversion. When the directional valve 6 is switched to the upper position, the main inlet P is connected to the diverter port, and the bypass port is cut off. Then the hydraulic oil in the main inlet P must be forcibly diverted through the diverter valve 5 to reduce the flow to the slipper and divert it to the non-slipper to enhance the driving force.

[0048] The directional control valve 6 can be a solenoid valve. In the event of slippage, the solenoid controlling the directional control valve 6 is energized and switches to the upper position. In this embodiment, the directional control valve 6 is a hydraulically controlled valve. The control valve includes a return port T, a pilot port G, a control port, and a solenoid valve 1 corresponding to the control port. The control port is connected to the hydraulic control terminal of the directional control valve 6. The solenoid valve 1 is used to hydraulically connect the control port to either the return port T or the pilot port G. As the pilot valve of the directional control valve 6, when in the lower position as shown in the diagram, the solenoid valve 1 opens the pilot port G and the control port, causing the pressure oil from the pilot port G to flow to the hydraulic control terminal of the directional control valve 6, thus causing the directional control valve 6 to switch to the upper position, i.e., forced flow diversion. When the solenoid valve 1 is in the upper position as shown in the diagram, the hydraulic control terminal of the directional control valve 6 is connected to the return port T, causing the directional control valve 6 to switch to the lower position.

[0049] In addition, the anti-slip diverter valve assembly in this embodiment may also include a relief valve 2. Relief valves 2 can be installed between the first working port A and the pilot port G, and between the second working port B and the pilot port G, allowing hydraulic oil in the working port with excessive pressure to overflow to the pilot port G through the relief valve 2. Furthermore, the anti-slip diverter valve assembly may also include a replenishing check valve 3, which is connected in parallel with the relief valve 2 between the first working port A and the pilot port G, and between the second working port B and the pilot port G. Similarly, if the oil in either the first working port A or the second working port B is insufficient, the hydraulic oil in the pilot port G can be replenished to that working port through the replenishing check valve 3 to prevent the motor from dry-drawing. Therefore, the parallel arrangement of the relief valve 2 and the replenishing check valve 3 can both set the system's safety pressure and prevent the motor from dry-drawing.

[0050] This application also discloses a hydrostatic four-wheel drive system, which includes the anti-slip diverter valve assembly described above. Therefore, the hydrostatic four-wheel drive system can solve the slippage problem through the forced diversion of the diverter valve 5, while saving energy and reducing pressure loss.

[0051] Specifically, the hydrostatic four-wheel drive system may include a travel pump (not shown in the figure) connected to the main oil inlet P; a front axle motor and a rear axle motor, one of which is connected to the first working oil port A, and the other is connected to the second working oil port B. For example, in this embodiment, the front axle motor is connected to the first working oil port A, and the rear axle motor is connected to the second working oil port B. Thus, under normal travel conditions, the hydraulic oil pumped by the travel pump simultaneously supplies oil to the front and rear axle motors, realizing the four-wheel drive travel mode. Once slippage occurs, the solenoid valve 1 can be energized, causing the hydraulic oil pumped by the travel pump to flow through the main oil inlet P, the reversing valve 6, and the diverter valve 5 to the first working oil port A and the second working oil port B, thereby alleviating or resolving the slippage problem through forced diversion.

[0052] This application also discloses agricultural machinery including the aforementioned hydrostatic four-wheel drive system, such as combine harvesters and wheeled harvesters. Among them, those using... Figure 2 The valve assembly shown can solve the slippage problem in a hydrostatic four-wheel drive system, reducing costs and simplifying installation. By adding a throttle orifice after the pressurized oil is diverted to adaptively fine-tune the diversion ratio, pressure loss is reduced and energy is saved.

[0053] In the description of this application, it should be understood that 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. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0054] In this application, unless otherwise expressly 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, an electrical connection, or a connection that allows communication between components; 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 expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0055] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. 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.

[0056] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. An anti-skid split flow valve group, characterized by, The anti-skid shunt valve group is provided with a main oil inlet (P), a first working oil port (A) and a second working oil port (B) and comprises: a shunt valve (5) provided with a bypass oil path (L) at both ends; a control valve for controlling hydraulic oil of the main oil inlet (P) to be shunted to the first working oil port (A) and the second working oil port (B) via the shunt valve (5), or controlling the hydraulic oil of the main oil inlet (P) to flow to the first working oil port (A) and the second working oil port (B) via the bypass oil path (L); a pressure trimming valve arranged behind the shunt valve (5) and hydraulically connecting the first working oil port (A) and the second working oil port (B).

2. The anti-slip flow divider valve group of claim 1, wherein, The pressure trimming valve is a throttle hole (4).

3. The anti-slip flow divider valve group of claim 1, wherein, The pressure trimming valve is an adjustable throttle valve.

4. The anti-slip flow divider valve group of claim 1, wherein, The control valve comprises a reversing valve (6) having one side oil port communicated with the main oil inlet (P) and the other side oil port comprising a shunt oil port connected with the shunt valve (5) and a bypass oil port connected with the bypass oil path (L), and the reversing valve (6) is used for switching the main oil inlet (P) to be connected with the shunt oil port or the bypass oil port.

5. The anti-slip flow divider valve group of claim 4, wherein, The reversing valve (6) is a hydraulic control valve, the control valve comprises an electromagnetic valve (1) having a return oil port (T), a pilot oil port (G), a control oil port and the control oil port corresponding to the electromagnetic valve (1), the control oil port is connected with the hydraulic control end of the reversing valve (6), and the electromagnetic valve (1) is used for hydraulically connecting the control oil port with the return oil port (T) or the pilot oil port (G).

6. The anti-slip flow divider valve group of claim 5, wherein, The anti-skid shunt valve group further comprises an overflow valve (2) arranged between the first working oil port (A) and the pilot oil port (G) and between the second working oil port (B) and the pilot oil port (G).

7. The anti-slip flow divider valve group of claim 6, wherein, The anti-skid shunt valve group further comprises an oil supplementing check valve (3) arranged in parallel with the overflow valve (2) between the first working oil port (A) and the pilot oil port (G) and between the second working oil port (B) and the pilot oil port (G).

8. A hydrostatic four-wheel drive system, characterized in that The hydrostatic four-wheel drive system comprises the anti-skid shunt valve group according to any one of claims 1-7.

9. The hydrostatic four-wheel drive system of claim 8, wherein, The hydrostatic four-wheel drive system comprises: a walking pump connected with the main oil inlet (P); front axle motors and rear axle motors, one of the front axle motors and the rear axle motors being connected with the first working oil port (A) and the other being connected with the second working oil port (B).

10. An agricultural machine characterized by, The agricultural machine comprises the hydrostatic four-wheel drive system according to claim 8 or 9.

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