Emergency steering system for tractor and tractor

Abstract

The utility model relates to agricultural machinery technical field especially relates to a tractor emergency steering system and tractor, the output end of steering pump communicates with the input end of first priority valve group, is equipped with T1 mouth for communicating with oil tank and P1 mouth for communicating with steering load on first priority valve group, the output end of emergency pump communicates with the input end of second priority valve group, and the output end of second priority valve group communicates T2 mouth for communicating with oil tank, and the input end of second priority valve group communicates with the input end of first priority valve group through first connecting oil circuit. The utility model can be in the engine is extinguished or conventional steering system failure time, automatic fast switching to emergency mode, need not the manual operation of driver, ensure the timeliness and reliability of steering control, can realize emergency steering function under the whole car no power state, do not depend on engine or additional power source, avoid the problem that steering system cannot work because of power source failure.

Description

Technical Field

[0001] This utility model relates to the field of agricultural machinery technology, and in particular to an emergency steering system for tractors and a tractor. Background Technology

[0002] As an important power source in agricultural production and construction machinery, the steering system of a tractor is a key component in ensuring safe operation and work. Traditional tractor steering systems typically rely on the engine's power output or the operation of the hydraulic system to achieve steering. However, in actual use, the steering system may fail due to engine stalling, hydraulic system malfunction, or other unforeseen circumstances, leading to serious safety hazards. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide an emergency steering system for tractors and a tractor, so as to overcome the shortcomings of the prior art.

[0004] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: An emergency steering system for tractors includes a steering pump, an emergency pump, a first priority valve group, and a second priority valve group. The output end of the steering pump is connected to the input end of the first priority valve group. The first priority valve group is provided with a T1 port for connecting to an oil tank and a P1 port for connecting to a steering load. The output end of the emergency pump is connected to the input end of the second priority valve group. The output end of the second priority valve group is connected to a T2 port for connecting to an oil tank. The input end of the second priority valve group is connected to the input end of the first priority valve group through a first connecting oil circuit. The first priority valve group is configured such that when the load pressure of the P1 port increases, the oil delivered from the output end of the steering pump to the T1 port decreases, and the oil delivered to the P1 port increases. The second priority valve group is configured such that when the output oil pressure of the second priority valve group is greater than the input oil pressure of the first priority valve group, the oil delivered from the output end of the emergency pump to the input end of the first priority valve group increases.

[0005] The beneficial effects of this utility model are: when the engine is off or the conventional steering system fails, it can automatically and quickly switch to emergency mode without the need for manual operation by the driver, ensuring the timeliness and reliability of steering control; it can realize emergency steering function when the vehicle is without power, without relying on the engine or an additional power source, avoiding the problem of the steering system failing to work due to the failure of the power source.

[0006] Based on the above technical solution, the present invention can be further improved as follows.

[0007] Furthermore, the first priority valve group is also provided with a P2 port and a P3 port for communicating with the input end of the first priority valve group. The P2 port is connected to the output end of the steering pump, and the P3 port is connected to the input end of the second priority valve group through the first connecting oil circuit.

[0008] The beneficial effect of adopting the above-mentioned further solution is that the setting of ports P2 and P3 can facilitate the connection with the output end of the steering pump and the first connecting oil circuit.

[0009] Furthermore, the first priority valve group includes a first priority valve, the input end of which is connected to the P1 port, the P2 port and the P3 port respectively, and the output end of which is connected to the T1 port. The first priority valve is configured such that when the load pressure of the P1 port increases, the passage between the input end and the output end of the first priority valve gradually decreases, so that the oil supplied from the P2 port to the P1 port increases and the oil supplied to the output end of the first priority valve decreases.

[0010] The beneficial effects of adopting the above-mentioned further solution are: by using a first priority valve, the oil supplied to port P1 can be adjusted according to the load pressure of port P1, without the need for manual operation by the driver. Steering control can be realized in a timely manner according to the load pressure of port P1, and the oil pressure of the steering fluid can be adjusted to ensure the timeliness and reliability of steering.

[0011] Furthermore, the first priority valve group is also provided with an LS port for connecting to the load of the P1 port. The spring end of the first priority valve is connected to the input end of the first priority valve through a throttle valve. The spring end of the first priority valve is connected to the LS port, and the non-spring end of the first priority valve is connected to the input end of the first priority valve.

[0012] The beneficial effect of adopting the above-mentioned further scheme is that when the LS port does not have load pressure, the pressure of the spring end of the first priority valve on the valve core is less than the hydraulic pressure of the non-spring end, thereby making the input end and output end of the first priority valve connected.

[0013] Furthermore, a first check valve is provided on the oil line connecting the input end of the first priority valve and the P1 port.

[0014] The beneficial effect of adopting the above-mentioned further solution is that the setting of the first check valve can prevent the backflow of oil under steering load.

[0015] Furthermore, the second priority valve group is provided with a P4 port and a P5 port. The P4 port is connected to the output end of the emergency pump, and the P5 port is connected to the input end of the first priority valve group through the first connecting oil circuit.

[0016] The beneficial effect of adopting the above-mentioned further solution is that the setting of P4 port and P5 port can facilitate the connection with the emergency pump and the first connection oil circuit.

[0017] Furthermore, the second priority valve group includes a second priority valve, the input end of which is connected to the P4 port and the P5 port, and the output end of which is connected to the T2 port; the second priority valve is configured such that when the output oil pressure of the second priority valve is greater than the oil pressure of the P5 port, the passage between the input end and the output end of the second priority valve gradually decreases, so as to increase the oil supplied from the P4 port to the P5 port, and a second check valve is provided on the oil line connecting the input end of the second priority valve and the P5 port.

[0018] The beneficial effect of adopting the above-mentioned further solution is that by using a second priority valve, the amount of oil delivered to port T2 can be adjusted according to the oil pressure at port P5 and the output pressure of the second priority valve, thereby enabling the hydraulic oil output by the emergency pump to partially flow to the first priority valve assembly port, providing sufficient hydraulic power for steering.

[0019] Furthermore, the spring end of the second priority valve is connected to the output end of the second priority valve, and the non-spring end of the second priority valve is connected to the P5 port.

[0020] The beneficial effect of adopting the above-mentioned further solution is that it can facilitate accurate detection of the oil pressure at the input end of the first priority valve group and the output end of the second priority valve, thereby timely determining whether hydraulic oil needs to be supplied to the first priority valve group.

[0021] Furthermore, the second priority valve group also includes a solenoid valve, the input end of which is connected to the output end of the second priority valve, and the output end of which is connected to the spring end of the second priority valve.

[0022] The beneficial effect of adopting the above-mentioned further solution is that the solenoid valve can ensure that the oil delivered by the emergency pump can flow directly to port T2 when emergency steering is not required.

[0023] This utility model also provides a tractor to solve the above-mentioned technical problems, including the emergency steering system for tractors described above.

[0024] The beneficial effects of adopting the above solution are: this utility model can automatically and quickly switch to emergency mode when the engine is off or the conventional steering system fails, without the need for manual operation by the driver, ensuring the timeliness and reliability of steering control; it can realize emergency steering function when the whole vehicle is without power, without relying on the engine or an additional power source, avoiding the problem of the steering system failing to work due to the failure of the power source. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of this utility model; The attached diagram lists the components represented by each number as follows: 1. Steering pump; 2. Emergency pump; 3. First priority valve; 4. Second priority valve; 5. First connecting oil circuit; 6. Throttle valve; 7. First check valve; 8. Second check valve; 9. Solenoid valve. Detailed Implementation

[0026] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0027] Example 1 like Figure 1 As shown, this embodiment discloses an emergency steering system for a tractor, including a steering pump 1, an emergency pump 2, a first priority valve group, and a second priority valve group. The output end of the steering pump 1 is connected to the input end of the first priority valve group. The first priority valve group has a T1 port for connecting to the return oil tank and a P1 port for connecting to the steering load. The output end of the emergency pump 2 is connected to the input end of the second priority valve group. The output end of the second priority valve group is connected to a T2 port for connecting to the return oil tank. The input end of the second priority valve group is connected to the input end of the first priority valve group through a first connecting oil circuit 5. The first priority valve group is configured such that when the load pressure at the P1 port increases, the oil delivered from the output end of the steering pump 1 to the T1 port decreases, and the oil delivered to the P1 port increases. The second priority valve group is configured such that when the output oil pressure of the second priority valve group is greater than the input oil pressure of the first priority valve group, the oil delivered from the output end of the emergency pump 2 to the input end of the first priority valve group increases.

[0028] In this embodiment, the first priority valve group is further provided with a P2 port and a P3 port for communicating with the input end of the first priority valve group. The P2 port is connected to the output end of the steering pump 1, and the P3 port is connected to the input end of the second priority valve group through the first connecting oil circuit 5. The P2 port and P3 port can facilitate the connection with the output end of the steering pump 1 and the first connecting oil circuit 5.

[0029] The first priority valve assembly includes a first priority valve 3. The input end of the first priority valve 3 is connected to ports P1, P2, and P3, respectively, and the output end of the first priority valve 3 is connected to port T1. The first priority valve 3 is configured such that when the load pressure at port P1 increases, the passage between the input and output ends of the first priority valve 3 gradually narrows, thereby increasing the amount of oil supplied from port P2 to port P1 and decreasing the amount of oil supplied to the output end of the first priority valve 3. By using the first priority valve 3, the amount of oil supplied to port P1 can be adjusted according to the load pressure at port P1, eliminating the need for manual operation by the driver. This allows for timely steering control based on the load pressure at port P1 and adjustment of the steering fluid pressure, ensuring timely and reliable steering.

[0030] Furthermore, the first priority valve assembly is also provided with an LS port for connecting to the load of the P1 port. The spring end of the first priority valve 3 is connected to the input end of the first priority valve 3 through a throttle valve 6, and the spring end of the first priority valve 3 is connected to the LS port. The non-spring end of the first priority valve 3 is connected to the input end of the first priority valve 3. The first priority valve 3 is configured such that when the LS port does not have load pressure, the pressure of the spring end of the first priority valve 3 on the valve core is less than the hydraulic pressure of the non-spring end, thereby connecting the input and output ends of the first priority valve 3.

[0031] A first check valve 7 is provided on the oil line connecting the input end of the first priority valve 3 and the P1 port. The first check valve 7 can prevent oil backflow under steering load.

[0032] In this embodiment, the second priority valve group is provided with ports P4 and P5. Port P4 is connected to the output end of the emergency pump 2, and port P5 is connected to the input end of the first priority valve group through the first connecting oil circuit 5. The provision of ports P4 and P5 facilitates connection with the emergency pump 2 and the first connecting oil circuit 5.

[0033] The second priority valve group includes a second priority valve 4. The input end of the second priority valve 4 is connected to ports P4 and P5, and the output end of the second priority valve 4 is connected to port T2. The second priority valve 4 is configured such that when the output oil pressure of the second priority valve 4 is greater than the oil pressure at port P5, the passage between the input and output ends of the second priority valve 4 gradually narrows, thereby increasing the amount of oil supplied from port P4 to port P5. A second check valve 8 is provided on the oil line connecting the input end of the second priority valve 4 and port P5. By using the second priority valve 4, the amount of oil supplied from the second priority valve 4 to port T2 can be adjusted according to the oil pressure at port P5 and the pressure at the output end of the second priority valve 4, thereby allowing a portion of the hydraulic oil output by the emergency pump 2 to flow to the first priority valve group port, providing sufficient hydraulic power for steering.

[0034] The spring end of the second priority valve 4 is connected to the output end of the second priority valve 4, and the non-spring end of the second priority valve 4 is connected to the P5 port. This facilitates accurate detection of the oil pressure at the input end of the first priority valve group and the output end of the second priority valve 4, thereby timely determining whether hydraulic oil needs to be supplied to the first priority valve group.

[0035] Furthermore, the second priority valve group also includes a solenoid valve 9. The input end of the solenoid valve 9 is connected to the output end of the second priority valve 4, and the output end of the solenoid valve 9 is connected to the spring end of the second priority valve 4. The solenoid valve 9 is configured to ensure that the oil delivered by the emergency pump 2 can flow directly to port T2 when emergency steering is not required.

[0036] like Figure 1 As shown, when the solenoid valve 9 is energized, it is in the lower position (that is, the spring end of the second priority valve 4 is connected to the output end of the second priority valve 4); when the solenoid valve 9 is de-energized, it is in the upper position (that is, the spring end of the second priority valve 4 is connected to the LS port). In the de-energized state of the solenoid valve 9, when the load pressure of the LS port increases, the pressure of the LS port acts on the spring end of the first priority valve 3, causing the connection between the input and output ends of the first priority valve 3 to gradually decrease, thereby causing some of the oil from the emergency pump 2 to flow to the P3 port to the P1 port to increase steering power.

[0037] Working principle: 1. After the tractor starts, if the tractor does not perform steering action, under pressure, the first priority valve 3 switches to the lower position (the input and output ends of the first priority valve 3 are connected), and the oil from the steering pump 1 flows into the first priority valve 3 and then returns to the oil tank through port T2 or enters other working systems. 2. Under the above working conditions, after the whole machine is powered on, if the emergency steering function is not required, the solenoid valve 9 can be energized. The emergency pump 2 enters the left side of the second priority valve 4 through port P4, overcoming the spring force on the right side. At this time, the second priority valve 4 reverses, and the oil of the emergency pump 2 enters the second priority valve 4 through port P4 and then flows into the T1 return oil tank or other working systems. 3. When a steering action is performed, the load pressure at the LS port continuously increases, causing the pressure in the upper chamber of the first priority valve 3 plus the spring force to exceed the pressure in the lower chamber of the first priority valve 3, triggering the first priority valve 3 to switch. At this time, the oil from the steering pump 1 enters the steering system through the P1 port to perform the steering action.

[0038] 4. When the oil supply from steering pump 1 is insufficient, the pressure at port P5 decreases, causing the pressure difference across the second priority valve 4 to be less than the spring force. This forces the second priority valve 4 to move to the left (when the valve core of the second priority valve 4 moves to the left, the input and output ends of the second priority valve 4 gradually close; when the valve core of the second priority valve 4 moves to the right, the input and output ends of the second priority valve 4 gradually open from the closed state). This reduces the amount of oil flowing from emergency pump 2 to port T1, prioritizing its combination with steering pump 1 to supply the steering system. Simultaneously, when the oil supply from steering pump 1 is insufficient, the load pressure at port LS gradually increases, increasing the pressure at the spring end of the first priority valve 4. This causes the first priority valve 4 to gradually close its input and output channels, allowing more oil to enter port P1 to provide steering power and ensuring the normal operation of the steering system. 5. During driving, when the engine suddenly shuts off, the steering pump 12 stops working momentarily, and the pressure at port P5 of the emergency pump 2 decreases, causing the pressure difference across the second priority valve 4 to be less than the spring force. This forces the second priority valve 4 to move to the left. Since the emergency pump 2 is driven by the tractor wheel, it can still work normally under the drive of inertia. At this time, the emergency pump 2 shuts off the oil flowing to port T1 and prioritizes supplying all the oil to the steering system, ensuring the normal operation of the steering system and protecting the driver's safety.

[0039] Example 2 This embodiment discloses a tractor, including the emergency steering system for tractors described above.

[0040] This invention can automatically and quickly switch to emergency mode when the engine is off or the conventional steering system fails, without requiring manual operation by the driver, ensuring the timeliness and reliability of steering control; it can realize emergency steering function when the vehicle is without power, without relying on the engine or an additional power source, avoiding the problem of the steering system failing to work due to power source failure.

[0041] In the description of this utility model, it should be understood that the terms "center", "length", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "inner", "outer", "circumferential", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the system 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 utility model.

[0042] In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0043] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," 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 utility model according to the specific circumstances.

[0044] 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.

[0045] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An emergency steering system for a tractor, characterized in that, The system includes a steering pump (1), an emergency pump (2), a first priority valve group, and a second priority valve group. The output end of the steering pump (1) is connected to the input end of the first priority valve group. The first priority valve group is provided with a T1 port for connecting to the oil tank and a P1 port for connecting to the steering load. The output end of the emergency pump (2) is connected to the input end of the second priority valve group. The output end of the second priority valve group is connected to a T2 port for connecting to the oil tank. The input end of the second priority valve group is connected to the input end of the first priority valve group through a first connecting oil circuit (5). The first priority valve group is configured such that when the load pressure of the P1 port increases, the oil delivered from the output end of the steering pump (1) to the T1 port decreases, and the oil delivered to the P1 port increases. The second priority valve group is configured such that when the output oil pressure of the second priority valve group is greater than the input oil pressure of the first priority valve group, the oil delivered from the output end of the emergency pump (2) to the input end of the first priority valve group increases.

2. The emergency steering system for a tractor according to claim 1, characterized in that, The first priority valve group is also provided with a P2 port and a P3 port for communicating with the input end of the first priority valve group. The P2 port is connected to the output end of the steering pump (1), and the P3 port is connected to the input end of the second priority valve group through the first connecting oil circuit (5).

3. The emergency steering system for a tractor according to claim 2, characterized in that, The first priority valve group includes a first priority valve (3). The input end of the first priority valve (3) is connected to the P1 port, the P2 port and the P3 port respectively. The output end of the first priority valve (3) is connected to the T1 port. The first priority valve (3) is configured such that when the load pressure of the P1 port increases, the channel between the input end and the output end of the first priority valve (3) gradually decreases, so that the oil delivered from the P2 port to the P1 port increases and the oil delivered to the output end of the first priority valve (3) decreases.

4. The emergency steering system for a tractor according to claim 3, characterized in that, The first priority valve group is also provided with an LS port for connecting to the load of the P1 port. The spring end of the first priority valve (3) is connected to the input end of the first priority valve (3) through a throttle valve (6). The spring end of the first priority valve (3) is connected to the LS port. The non-spring end of the first priority valve (3) is connected to the input end of the first priority valve (3).

5. An emergency steering system for a tractor according to claim 3 or 4, characterized in that, A first check valve (7) is provided on the oil line connecting the input end of the first priority valve (3) and the P1 port.

6. An emergency steering system for a tractor according to any one of claims 1 to 4, characterized in that, The second priority valve group is provided with a P4 port and a P5 port. The P4 port is connected to the output end of the emergency pump (2), and the P5 port is connected to the input end of the first priority valve group through the first connecting oil circuit (5).

7. An emergency steering system for a tractor according to claim 6, characterized in that, The second priority valve group includes a second priority valve (4), the input end of the second priority valve (4) is connected to the P4 port and the P5 port, and the output end of the second priority valve (4) is connected to the T2 port; the second priority valve (4) is configured such that when the output oil pressure of the second priority valve (4) is greater than the oil pressure of the P5 port, the passage between the input end and the output end of the second priority valve (4) gradually becomes smaller, so that the oil delivered from the P4 port to the P5 port increases, and a second check valve (8) is provided on the oil line connecting the input end of the second priority valve (4) and the P5 port.

8. An emergency steering system for a tractor according to claim 7, characterized in that, The spring end of the second priority valve (4) is connected to the output end of the second priority valve (4), and the non-spring end of the second priority valve (4) is connected to the P5 port.

9. An emergency steering system for a tractor according to claim 8, characterized in that, The second priority valve group also includes a solenoid valve (9), the input end of which is connected to the output end of the second priority valve (4), and the output end of which is connected to the spring end of the second priority valve (4).

10. A tractor, characterized in that, The tractor emergency steering system includes any one of claims 1 to 9.

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