Hydraulic systems and vehicles

Abstract

The present application discloses a hydraulic system and a vehicle. The hydraulic system includes an oil tank, an oil pumping mechanism, a multi-way valve and an actuator. The oil pumping mechanism is connected to the oil tank, and the multi-way valve is arranged between the oil pumping mechanism and the actuator. The actuator includes a steering unit, and the steering unit is used to provide power for wheel steering. The multi-way valve is used to selectively open or close the oil circuit between the oil pumping mechanism and the steering unit. In the hydraulic system and vehicle of the embodiment of the present application, the actuator includes a steering unit, and the steering unit can provide power for wheel steering. The multi-way valve is used to selectively open or close the oil circuit between the oil pumping mechanism and the steering unit. In this way, the hydraulic system can control the wheel steering by hydraulic transmission. Compared with the chain transmission method used in the related art to achieve wheel steering, the push-pull force is greater, which is suitable for the steering requirements of large-tonnage vehicles, thereby improving the stability and reliability of vehicle operation.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and more specifically, to a hydraulic system and a vehicle. Background Art

[0002] In the related art, vehicles, such as forklifts, usually use chain drive to achieve wheel steering. However, since the load-bearing capacity of the chain is limited and the length of the chain changes due to the tension and stretching force, if the vehicle is a large-tonnage vehicle, that is, when the steering resistance of the vehicle is large, it will be difficult to achieve wheel steering by using chain drive, which will affect the stability and reliability of the vehicle operation. Summary of the invention

[0003] Embodiments of the present application provide a hydraulic system and a vehicle.

[0004] The hydraulic system of the embodiment of the present application includes an oil tank, an oil pumping mechanism, a multi-way valve and an actuator. The oil pumping mechanism is connected to the oil tank, and the multi-way valve is arranged between the oil pumping mechanism and the actuator. The actuator includes a steering unit, and the steering unit is used to provide power for wheel steering. The multi-way valve is used to selectively open or close the oil circuit between the oil pumping mechanism and the steering unit.

[0005] In certain embodiments, the hydraulic system further comprises a locking member, wherein the locking member is disposed between the multi-way valve and the steering unit, and the locking member is used to limit the movement of the steering unit.

[0006] In some embodiments, the steering unit includes a first steering cylinder and a second steering cylinder, and the first steering cylinder and the second steering cylinder are arranged in parallel.

[0007] In certain embodiments, the first steering cylinder includes a first rodless chamber oil port and a first rod chamber oil port, the second steering cylinder includes a second rodless chamber oil port and a second rod chamber oil port, the first rodless chamber oil port and the second rodless chamber oil port are connected in parallel, and the first rod chamber oil port and the second rod chamber oil port are connected in parallel.

[0008] In some embodiments, the actuator also includes a lifting cylinder, a tilting cylinder and a side-shifting cylinder, and the multi-way valve is also used to selectively open or close the oil circuit between the oil pumping mechanism and at least one of the lifting cylinder, the tilting cylinder and the side-shifting cylinder.

[0009] In some embodiments, the tilt cylinder includes one, and the multi-way valve includes a restriction member, and the restriction member is used to restrict the movement of the tilt cylinder.

[0010] In some embodiments, the multi-way valve is a pressure-compensated load-sensitive electric proportional multi-way valve, an electromagnetic reversing multi-way valve, or a manual reversing multi-way valve.

[0011] In certain embodiments, the hydraulic system further includes a braking mechanism and a brake, wherein the braking mechanism is disposed between the oil pumping mechanism and the brake, and the braking mechanism is used to selectively open or close the oil circuit between the oil pumping mechanism and the brake.

[0012] In some embodiments, the braking mechanism includes a first brake valve and a second brake valve, the first brake valve is arranged between the oil pumping mechanism and the brake to close the oil circuit between the oil pumping mechanism and the brake when the first brake valve is started, and the second brake valve is arranged between the oil pumping mechanism and the brake to close the oil circuit between the oil pumping mechanism and the brake when the second brake valve is started.

[0013] In some embodiments, the first brake valve has a first position and a second position. When the first brake valve is activated, the first brake valve is in the first position, and when the first brake valve is not activated, the first brake valve is in the second position. The second brake valve has a first working position and a second working position. When the second brake valve is activated, the second brake valve is in the first working position, and when the second brake valve is not activated, the second brake valve is in the second working position.

[0014] In certain embodiments, the hydraulic system further includes an accumulator, which is disposed between the oil pumping mechanism and the brake mechanism, and is used to store the oil pumped by the oil pumping mechanism and deliver the oil to the brake mechanism.

[0015] In certain embodiments, the brake mechanism further comprises a manual pump connected between the brake and the oil tank, and the manual pump is used to pump the oil in the oil tank into the brake.

[0016] In some embodiments, the brake mechanism further includes a third brake valve, which is disposed between the first brake valve of the brake mechanism and the second brake valve of the brake mechanism, and is used to selectively open or close the oil circuit between the first brake valve and the second brake valve.

[0017] The vehicle according to the embodiment of the present application includes the hydraulic system described in any of the above embodiments.

[0018] In some embodiments, the vehicle further includes a frame and a cab, wherein the cab is rotatably disposed on the frame; the hydraulic system further includes a swivel joint, wherein the swivel joint is disposed between the cab and the frame, and the swivel joint is used to keep the brake lines and circuits between the cab and the frame connected.

[0019] In certain embodiments, the swivel joint is used to connect the oil circuit between the oil pumping mechanism and the brake mechanism of the hydraulic system, the oil circuit between the brake mechanism and the brake of the hydraulic system, and the oil circuit between the brake mechanism and the oil tank.

[0020] In the hydraulic system and vehicle of the implementation mode of the present application, the actuator includes a steering unit, which can provide power for wheel steering. The multi-way valve is used to selectively open or close the oil circuit between the oil pumping mechanism and the steering unit. In this way, the hydraulic system can control the wheel steering through hydraulic transmission. Compared with the chain transmission method used in the related art to achieve wheel steering, the push-pull force is greater, which is suitable for the steering requirements of large-tonnage vehicles, thereby improving the stability and reliability of vehicle operation.

[0021] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0023] Figure 1 is a schematic diagram of a three-dimensional structure of a vehicle according to certain embodiments of the present application;

[0024] Figure 2 yes Figure 1 A schematic diagram of a three-dimensional structure of an embodiment of a partial structure in the vehicle;

[0025] Figure 3 yes Figure 1 A schematic diagram of a three-dimensional structure of another embodiment of a partial structure in the vehicle;

[0026] Figure 4 is a schematic diagram of a hydraulic system of certain embodiments of the present application;

[0027] Figure 5 yes Figure 4 A schematic diagram of some structures in the hydraulic system.

[0028] Description of main component symbols:

[0029] Vehicles 1000;

[0030] Hydraulic system 100; frame 200; wheels 300, left front wheel 310, right front wheel 320; fork 400; cab 500;

[0031] Oil tank 10; oil pump mechanism 20, oil pump 21, oil pump motor 23, first oil filter 25; second oil filter 201; speed limiting valve 203;

[0032] Multi-way valve 30, first oil port A1, second oil port A2, third oil port A3, fourth oil port A4, fifth oil port A5, sixth oil port A6, seventh oil port A7, oil inlet P, oil return port T, restriction member 31, first solenoid valve 33, second solenoid valve 35, third solenoid valve 37, fourth solenoid valve 38, fifth solenoid valve 39;

[0033] Actuator 40, steering unit 41, first steering cylinder 411, first rodless chamber oil port 4111, first rod chamber oil port 4113, second steering cylinder 413, second rodless chamber oil port 4131, second rod chamber oil port 4133, lifting cylinder 43, tilt cylinder 45, side shift cylinder 47;

[0034] Locking member 50; brake mechanism 60, first brake valve 61, second brake valve 63, first drive member 65, second drive member 67, manual pump 68, third brake valve 69; brake 70; accumulator 80; charging valve 91; pressure reducing valve block 93, swivel joint 95. DETAILED DESCRIPTION

[0035] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0036] In the description of the present application, it should be understood that the terms "center", "length", "up", "down", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0037] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0038] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0039] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0040] See also Figure 1 and Figure 4 The vehicle 1000 of the embodiment of the present application includes a hydraulic system 100. It should be noted that, in some embodiments, the vehicle 1000 includes but is not limited to a forklift, a truck, a tractor-type semitrailer, and a container transporter.

[0041] Specifically, please combine Figure 2 and Figure 3In some embodiments, the vehicle 1000 further includes a frame 200 and wheels 300, and a portion of the hydraulic system 100 is disposed on the frame 200 and can be connected to the wheels 300. The hydraulic system 100 is at least used to provide power to the wheels 300 so that the wheels 300 rotate relative to the frame 200. Among them, the wheels 300 may include a left front wheel 310 and a right front wheel 320 of the vehicle 1000. When the hydraulic system 100 provides power to the wheels 300 so that the wheels 300 rotate relative to the frame 200, the vehicle 1000 can achieve lateral movement (e.g., right and left movement) or rotation (e.g., turning in place, etc.). Exemplarily, when the central axis of the front wheels (including the left front wheel 310 and the right front wheel 320) is perpendicular to the forward direction X of the vehicle 1000 ( Figure 2 In the case of the vehicle 1000, the hydraulic system 100 can drive the front wheel to turn 90° relative to the frame 200. In this case, the central axis of the wheel 300 is parallel to the forward direction X of the vehicle 1000 ( Figure 3 As shown), the vehicle 1000 is able to achieve lateral movement.

[0042] Among them, since the vehicle 1000 in this embodiment includes the hydraulic system 100, it can be understood that the vehicle 1000 includes at least the same beneficial effects as the hydraulic system 100. Therefore, for the beneficial effects of the vehicle 1000, please refer to the beneficial effects of the hydraulic system 100 described below.

[0043] See also Figure 1 and Figure 4 The hydraulic system 100 of the embodiment of the present application includes an oil tank 10, an oil pumping mechanism 20, a multi-way valve 30 and an actuator 40. The oil pumping mechanism 20 is connected to the oil tank 10. The multi-way valve 30 is arranged between the oil pumping mechanism 20 and the actuator 40. The actuator 40 includes a steering unit 41. The steering unit 41 is used to provide power for steering the wheel 300. The multi-way valve 30 is used to selectively open or close the oil circuit between the oil pumping mechanism 20 and the steering unit 41.

[0044] The oil tank 10 is a device for storing oil in the hydraulic system 100. The oil pumping mechanism 20 is a structure in the hydraulic system 100 for pumping the oil in the oil tank 10 to the device in the hydraulic system 100 that needs to use the oil to operate. In certain embodiments of the present application, the oil pumping mechanism 20 includes an oil pump 21, an oil pump motor 23 and a first oil filter 25. The oil pump motor 23 can drive the oil pump 21 to absorb oil from the oil tank 10 and pump the absorbed oil to other devices through the first oil filter 25. The first oil filter 25 can filter impurities in the oil to prevent the impurities in the oil from causing damage to the devices in the hydraulic system 100, thereby ensuring the normal operation of the hydraulic system 100. The first oil filter 25 can be a pressure oil filter, etc.

[0045] The multi-way valve 30 is a device in the hydraulic system 100 for changing the flow direction, pressure and flow rate of the oil to control the operation of the actuator 40. The multi-way valve 30 can combine multiple valves (such as safety valves, diverter valves and one-way valves, etc.) together, thereby reducing the number of pipelines and components, improving the integration of the hydraulic system 100, and improving the stability and reliability of the hydraulic system 100. It should be noted that in some embodiments, the multi-way valve 30 is a pressure-compensated load-sensitive electric proportional multi-way valve, an electromagnetic reversing multi-way valve or a manual reversing multi-way valve.

[0046] In certain embodiments of the present application, the multi-way valve 30 is provided with a plurality of oil ports, all of which are connected to the actuator 40, and the plurality of valve bodies in the multi-way valve 30 can respectively control the opening or closing of the plurality of oil ports to control the operation of the actuator 40. Specifically, the multi-way valve 30 is also provided with an oil inlet P and an oil return port T, the oil inlet P is connected to the oil pumping mechanism 20, and the oil pumping mechanism 20 can pump the oil into the multi-way valve 30 through the oil inlet P. The oil return port T is connected to the oil tank 10, and the oil in the multi-way valve 30 can flow back to the oil tank 10 through the oil return port T. It can be understood that a second oil filter 201 is provided on the oil path between the oil return port T and the oil tank 10, and the second oil filter 201 can filter impurities in the oil to prevent the oil in the oil tank 10 from being contaminated by impurities in the oil.

[0047] See also Figure 4 and Figure 5 In some embodiments, the multi-way valve 30 is provided with a first oil port A1 and a second oil port A2, both of which are connected to the steering unit 41, and the multi-way valve 30 includes a first solenoid valve 33, which can control the opening or closing of the first oil port A1 and the second oil port A2 to control the operation of the steering unit 41. Exemplarily, one of the first oil port A1 and the second oil port A2 is used to supply oil to the steering unit 41, and the other of the first oil port A1 and the second oil port A2 is used to receive the return oil of the steering unit 41. It should be noted that, in some embodiments, the first solenoid valve 33 can be a three-position solenoid valve.

[0048] In the hydraulic system 100 of the embodiment of the present application, the actuator 40 includes a steering unit 41, which can provide power for the steering of the wheel 300. The multi-way valve 30 is used to selectively open or close the oil circuit between the oil pumping mechanism 20 and the steering unit 41. In this way, the hydraulic system 100 can control the steering of the wheel 300 through hydraulic transmission. Compared with the chain transmission method used in the related art to achieve the steering of the wheel 300, the push-pull force is greater, which is suitable for the steering requirements of large-tonnage vehicles, thereby improving the stability and reliability of the operation of the vehicle 1000.

[0049] In addition, when the vehicle 1000 is a large-tonnage vehicle, if the length of the chain changes, the wheel 300 will shake, which will easily cause the wheel 300 to wear and the vehicle 1000 to have poor running stability. Therefore, in the embodiment of the present application, the hydraulic system 100 controls the steering of the wheel 300 by hydraulic transmission, and can also reduce the possibility of the wheel 300 shaking, thereby reducing the wear of the wheel 300, extending the service life of the wheel 300, and improving the running stability of the vehicle 1000.

[0050] See also Figure 4 In some embodiments, the hydraulic system 100 may further include a locking member 50 , which is disposed between the multi-way valve 30 and the steering unit 41 , and is used to limit the movement of the steering unit 41 .

[0051] Specifically, in some embodiments, the locking member 50 may be disposed between the oil port (including the first oil port A1 and the second oil port A2) and the steering unit 41. The setting of the locking member 50 can close the oil circuit when the hydraulic system 100 does not supply oil to the steering unit 41, thereby limiting the steering unit 41, preventing the steering unit 41 from moving and causing the wheel 300 to turn when the oil leaks, thereby ensuring that the wheel 300 can be reliably positioned at any position without deflection, reducing the wear of the wheel 300, and extending the service life of the wheel 300. It should be noted that, in some embodiments, the locking member 50 includes but is not limited to a hydraulic lock and a two-way interlocking balance valve.

[0052] See also Figure 2 and Figure 4 In some embodiments, the steering unit 41 includes a first steering cylinder 411 and a second steering cylinder 413, and the first steering cylinder 411 and the second steering cylinder 413 are arranged in parallel. It should be noted that, in some embodiments, the first steering cylinder 411 and the second steering cylinder 413 correspond to the left front wheel 310 and the right front wheel 320, respectively. In the embodiment of the present application, only the first steering cylinder 411 corresponds to the left front wheel 310, and the second steering cylinder 413 corresponds to the right front wheel 320 as an example for description.

[0053] Specifically, in some embodiments, the first steering cylinder 411 and the second steering cylinder 413 are arranged in parallel, so that when one of the first oil port A1 and the second oil port A2 supplies oil to the steering unit 41, the first steering cylinder 411 and the second steering cylinder 413 can both move to provide power to the wheel 300 to drive the wheel 300 to steer. Exemplarily, when the first oil port A1 supplies oil to the steering unit 41, the first steering cylinder 411 and the second steering cylinder 413 can respectively provide power to the left front wheel 310 and the right front wheel 320 to drive the left front wheel 310 and the right front wheel 320 to steer. Among them, the left front wheel 310 can rotate in a clockwise direction, and the right front wheel 320 can rotate in a counterclockwise direction. When the first steering cylinder 411 and the second steering cylinder 413 move synchronously, the left front wheel 310 and the right front wheel 320 rotate in opposite directions and have the same rotation angle.

[0054] Furthermore, please combine Figure 5 In some embodiments, the first steering cylinder 411 includes a first rodless chamber oil port 4111 and a first rod chamber oil port 4113, the second steering cylinder 413 includes a second rodless chamber oil port 4131 and a second rod chamber oil port 4133, the first rodless chamber oil port 4111 and the second rodless chamber oil port 4131 are connected in parallel, and the first rod chamber oil port 4113 and the second rod chamber oil port 4133 are connected in parallel.

[0055] Specifically, in some embodiments, the first rodless chamber oil port 4111 and the second rodless chamber oil port 4131 are connected in parallel and are both connected to the first oil port A1; the first rod chamber oil port 4113 and the second rod chamber oil port 4133 are connected in parallel and are both connected to the second oil port A2. Exemplarily, when the first oil port A1 supplies oil to the steering unit 41, the oil can enter the rodless chamber of the first steering cylinder 411 and the rodless chamber of the second steering cylinder 413 respectively. In this case, the oil in the rod chamber of the first steering cylinder 411 and the rod chamber of the second steering cylinder 413 can return oil (return to the oil tank 10) through the second oil port A2, and the first steering cylinder 411 and the second steering cylinder 413 can provide power to the wheel 300 to steer the wheel 300.

[0056] In other embodiments, the first rodless chamber oil port 4111 and the second rodless chamber oil port 4131 are connected in parallel and are both connected to the second oil port A2; the first rod chamber oil port 4113 and the second rod chamber oil port 4133 are connected in parallel and are both connected to the first oil port A1. Exemplarily, when the second oil port A2 supplies oil to the steering unit 41, the oil can enter the rodless chamber of the first steering cylinder 411 and the rodless chamber of the second steering cylinder 413 respectively. In this case, the oil in the rod chamber of the first steering cylinder 411 and the rod chamber of the second steering cylinder 413 can return oil through the first oil port A1, and the first steering cylinder 411 and the second steering cylinder 413 can provide power to the wheel 300 to steer the wheel 300.

[0057] See also Figure 4 In some embodiments, the actuator 40 also includes a lifting cylinder 43, a tilting cylinder 45 and a side-shifting cylinder 47, and the multi-way valve 30 is also used to selectively open or close the oil circuit between the oil pumping mechanism 20 and at least one of the lifting cylinder 43, the tilting cylinder 45 and the side-shifting cylinder 47.

[0058] Specifically, please combine Figure 1 In some embodiments, when the vehicle 1000 is a forklift, the vehicle 1000 further includes a fork 400, and the vehicle 1000 can load, unload, stack and transport goods through the fork 400. Among them, the lifting cylinder 43 is used to control the up and down movement of the fork 400. The tilting cylinder 45 is used to control the forward and backward tilting of the fork 400. The side shift cylinder 47 is used to control the left and right side shifting of the fork 400.

[0059] More specifically, please combine Figure 5 In some embodiments, the multi-way valve 30 is provided with a third oil port A3, which is connected to the lifting cylinder 43, and the third oil port A3 is used to supply oil to and return oil from the lifting cylinder 43. The multi-way valve 30 includes a second solenoid valve 35 and a third solenoid valve 37, one of which can supply oil to the lifting cylinder 43 through the third oil port A3, and the other of which can receive the return oil from the lifting cylinder 43 through the third oil port A3. In one example, a speed limiting valve 203 is provided on the oil path between the lifting cylinder 43 and the third oil port A3, and the speed limiting valve 203 can control the flow rate of the oil, thereby realizing the control of the speed of the lifting cylinder 43, and preventing the fork 400 from moving up and down too fast and causing a greater safety risk. It should be noted that in some embodiments, the second solenoid valve 35 and the third solenoid valve 37 can both be two-position two-way valves.

[0060] The multi-way valve 30 is provided with a fourth oil port A4 and a fifth oil port A5, both of which are connected to the tilt cylinder 45. The multi-way valve 30 includes a fourth solenoid valve 38, which can control the opening or closing of the fourth oil port A4 and the fifth oil port A5 to control the operation of the tilt cylinder 45. Exemplarily, one of the fourth oil port A4 and the fifth oil port A5 is used to supply oil to the tilt cylinder 45, and the other of the fourth oil port A4 and the fifth oil port A5 is used to receive the return oil of the tilt cylinder 45. It should be noted that in some embodiments, the fourth solenoid valve 38 can be a three-position solenoid valve.

[0061] The multi-way valve 30 is provided with a sixth oil port A6 and a seventh oil port A7, both of which are connected to the side shift cylinder 47. The multi-way valve 30 includes a fifth solenoid valve 39, which can control the opening or closing of the sixth oil port A6 and the seventh oil port A7 to control the operation of the side shift cylinder 47. Exemplarily, one of the sixth oil port A6 and the seventh oil port A7 is used to supply oil to the side shift cylinder 47, and the other of the sixth oil port A6 and the seventh oil port A7 is used to receive the return oil of the side shift cylinder 47. It should be noted that, in some embodiments, the fifth solenoid valve 39 can be a three-position solenoid valve.

[0062] In some embodiments, the tilt cylinder 45 includes one, and the multi-way valve 30 includes a limiting member 31, which is used to limit the movement of the tilt cylinder 45. The setting of the limiting member 31 can close the oil circuit when the hydraulic system 100 does not supply oil to the tilt cylinder 45, thereby limiting the tilt cylinder 45 and preventing the tilt cylinder 45 from moving and causing the fork 400 to tilt when the cargo is too heavy or the oil leaks. It should be noted that in some embodiments, the limiting member 31 may include but is not limited to a two-way interlocking balance valve and a double hydraulically controlled one-way valve.

[0063] In other embodiments, a two-way interlocking balance valve or a two-way hydraulic lock may be provided between the multi-way valve 30 and the tilt cylinder 45, so as to limit the tilt cylinder 45 and prevent the tilt cylinder 45 from moving and causing the fork 400 to tilt when the cargo is too heavy or the oil leaks.

[0064] See also Figure 4 In some embodiments, the hydraulic system 100 further includes a brake mechanism 60 and a brake 70 . The brake mechanism 60 is disposed between the oil pumping mechanism 20 and the brake 70 . The brake mechanism 60 is used to selectively open or close the oil circuit between the oil pumping mechanism 20 and the brake 70 .

[0065] Specifically, please combine Figure 1In some embodiments, when the brake mechanism 60 opens the oil circuit between the oil pumping mechanism 20 and the brake 70, the oil circuit between the brake 70 and the oil tank 10 is closed, and the oil pumping mechanism 20 can pump the oil in the oil tank 10 into the brake 70. In this case, the brake 70 can release the brake on the wheel 300, and the vehicle 1000 is in a normal driving condition, that is, the vehicle 1000 can drive normally; when the brake mechanism 60 closes the oil circuit between the oil pumping mechanism 20 and the brake 70, the oil circuit between the brake 70 and the oil tank 10 is opened, and the oil in the brake 70 can flow back to the oil tank 10. In this case, the brake 70 can brake the wheel 300, and the vehicle 1000 is in a parking brake condition or a driving brake condition, that is, the vehicle 1000 stops or the driving speed of the vehicle 1000 decreases.

[0066] See also Figure 1 and Figure 4 In some embodiments, the brake mechanism 60 includes a first brake valve 61 and a second brake valve 63. The first brake valve 61 is disposed between the oil pumping mechanism 20 and the brake 70 to close the oil circuit between the oil pumping mechanism 20 and the brake 70 when the first brake valve 61 is activated. The second brake valve 63 is disposed between the oil pumping mechanism 20 and the brake 70 to close the oil circuit between the oil pumping mechanism 20 and the brake 70 when the second brake valve 63 is activated. It should be noted that in some embodiments of the present application, the first brake valve 61 and the second brake valve 63 may both be three-position valves. The first brake valve 61 may be a service brake, and the second brake valve 63 may be a parking brake.

[0067] Specifically, in some embodiments, when the first brake valve 61 is activated, the oil circuit between the brake 70 and the oil tank 10 is connected, and the oil in the brake 70 can flow back into the oil tank 10. In this case, the brake 70 can brake the wheel 300; when the first brake valve 61 is released (i.e., not activated), the oil circuit between the brake 70 and the oil pumping mechanism 20 is connected, and the oil pumping mechanism 20 can pump the oil in the oil tank 10 into the brake 70. In this case, the brake 70 can release the braking of the wheel 300. When the second brake valve 63 is activated, the oil circuit between the brake 70 and the oil tank 10 is connected, and the oil in the brake 70 can flow back into the oil tank 10. In this case, the brake 70 can brake the wheel 300; when the second brake valve 63 is released (i.e. not activated), the oil circuit between the oil pumping mechanism 20 and the brake 70 is connected, and the oil pumping mechanism 20 can pump the oil in the oil tank 10 into the brake 70. In this case, the brake 70 can release the brake on the wheel 300.

[0068] It can be understood that, in certain embodiments, when the first brake valve 61 is activated, the oil in the brake 70 can flow back to the oil tank 10 through the second brake valve 63 and the first brake valve 61 in sequence; when the second brake valve 63 is activated, the oil in the brake 70 can flow back to the oil tank 10 through the second brake valve 63; when the first brake valve 61 is not activated and the second brake valve 63 is not activated, the oil can flow into the brake 70 through the first brake valve 61 and the second brake valve 63 in sequence; when the first brake valve 61 is not activated and the second brake valve 63 is activated, the brake 70 can brake the wheel 300; when the second brake valve 63 is not activated and the first brake valve 61 is activated, the brake 70 can brake the wheel 300.

[0069] More specifically, in some embodiments, during normal driving of the vehicle 1000, the operator can activate the first brake valve 61 to brake the wheel 300. At this time, the vehicle 1000 stops or the driving speed of the vehicle 1000 gradually decreases; when the vehicle 1000 is in a parked state, the operator can activate the second brake valve 63 to brake the wheel 300, thereby preventing the vehicle 1000 from sliding in the parked state and improving the safety of the vehicle 1000.

[0070] Further, in some embodiments, the first brake valve 61 has a first position and a second position. When the first brake valve 61 is activated, the first brake valve 61 is in the first position, and when the first brake valve 61 is not activated, the first brake valve 61 is in the second position. The second brake valve 63 has a first working position and a second working position. When the second brake valve 63 is activated, the second brake valve 63 is in the first working position, and when the second brake valve 63 is not activated, the second brake valve 63 is in the second working position.

[0071] Specifically, in some embodiments, the first driving member 65 can drive the first brake valve 61 to move upward, that is, Figure 4 As shown, the first driving member 65 can drive the first brake valve 61 to move upward. In this case, the first brake valve 61 is in the first position, the oil circuit between the oil pump mechanism 20 and the brake 70 is closed, and the oil circuit between the oil tank 10 and the brake 70 is connected; the first driving member 65 can drive the first brake valve 61 to move downward, that is, Figure 4As shown, the first driving member 65 can drive the first brake valve 61 to move downward, in which case the first brake valve 61 can be in the second position, the oil circuit between the oil pump mechanism 20 and the brake 70 is connected, and the oil circuit between the oil tank 10 and the brake 70 is closed. In one example, when the first driving member 65 is driven (i.e., subjected to external force), the first brake valve 61 moves upward, and when the first driving member 65 is not driven (i.e., not subjected to external force), the first brake valve 61 moves downward.

[0072] The second driving member 67 can drive the second brake valve 63 to move leftward, that is, Figure 4 As shown, the second driving member 67 can drive the second brake valve 63 to move leftward. In this case, the second brake valve 63 is in the first working position, the oil circuit between the oil pump mechanism 20 and the brake 70 is closed, and the oil circuit between the oil tank 10 and the brake 70 is connected; the second driving member 67 can drive the second brake valve 63 to move rightward, that is, Figure 4 As shown, the second driving member 67 can drive the second brake valve 63 to move rightward. In this case, the second brake valve 63 is in the second working position, the oil circuit between the oil pump mechanism 20 and the brake 70 is connected, and the oil circuit between the oil tank 10 and the brake 70 is closed. In one example, when the second driving member 67 is driven, the second brake member moves leftward, and when the first driving member 65 is driven again, the first brake member moves rightward.

[0073] See also Figure 4 In some embodiments, the brake mechanism 60 further includes a first driving member 65 and a second driving member 67, wherein the first driving member 65 is connected to the first brake valve 61, and the second driving member 67 is connected to the second brake valve 63. When the first driving member 65 is driven, the first brake valve 61 is activated; when the second driving member 67 is driven, the second brake valve 63 is activated. It can be understood that, in some embodiments, the driving of the first driving member 65 requires manual intervention, that is, the first driving member 65 is driven manually to activate the first brake valve 61; or, the first driving member 65 is driven manually with the aid of a tool to activate the first brake valve 61. Accordingly, the driving of the second driving member 67 requires manual intervention, that is, the second driving member 67 is driven manually to activate the second brake valve 63; or, the second driving member 67 is driven manually with the aid of a tool to activate the second brake valve 63.

[0074] See also Figure 4 In some embodiments, the hydraulic system 100 further includes an accumulator 80 , which is disposed between the oil pumping mechanism 20 and the brake mechanism 60 , and is used to contain the oil pumped by the oil pumping mechanism 20 .

[0075] Specifically, in some embodiments, the hydraulic system 100 may further include a filling valve 91, which is used to fill the accumulator 80 with liquid when the pumping mechanism 20 is running, so that the pressure in the accumulator 80 is always maintained at a set value. Among them, the setting of the accumulator 80 can, on the one hand, keep the pressure of the hydraulic system 100 constant, prevent the brake 70 from braking the wheel 300 due to insufficient pressure of the pumping mechanism 20 supplying oil to the brake mechanism 60 during the driving of the vehicle 1000, and ensure the stability of the operation of the vehicle 1000; on the other hand, it can prevent the pumping mechanism 20 from generating a large hydraulic impact on the brake mechanism 60, causing damage to the brake mechanism 60, thereby extending the service life of the brake mechanism 60 and ensuring the stability and reliability of the operation of the hydraulic system 100.

[0076] More specifically, in some embodiments, the hydraulic system 100 may further include a pressure reducing valve block 93, which is disposed between the accumulator 80 and the brake mechanism 60. The pressure reducing valve block 93 is used to reduce the pressure of the oil output by the accumulator 80 so that the pressure of the oil matches the brake mechanism 60, thereby ensuring the normal operation of the hydraulic system 100.

[0077] If the power supply or oil circuit of the vehicle 1000 fails and the oil cannot be supplied normally, the brake 70 will continue to brake the wheel 300, which will make it impossible for the operator to tow the faulty vehicle 1000. Figure 1 and Figure 4 In some embodiments of the present application, the brake mechanism 60 further includes a manual pump 68, which is connected between the brake 70 and the oil tank 10, and is used to pump the oil in the oil tank 10 into the brake 70. Thus, the provision of the manual pump 68 enables the brake 70 to supply oil when the vehicle 1000 fails, so that the brake 70 releases the brake on the wheel 300, so that the operator can tow the vehicle 1000 for repairing the vehicle 1000.

[0078] Furthermore, in some embodiments, the braking mechanism 60 also includes a third brake valve 69, which is arranged between the first brake valve 61 of the braking mechanism 60 and the second brake valve 63 of the braking mechanism 60, and the third brake valve 69 is used to selectively open or close the oil circuit between the first brake valve 61 and the second brake valve 63.

[0079] If the manual pump 68 pumps the oil in the oil tank 10 into the brake 70, and the oil circuit between the first brake valve 61 and the second brake valve 63 is in a conducting state, the oil in the brake 70 will flow back to the oil tank 10 through the oil circuit between the first brake valve 61 and the second brake valve 63. At this time, the braking state of the wheel 300 cannot be released, which will affect the operator's towing of the vehicle 1000. Therefore, the third brake valve 69 is set to selectively open or close the oil circuit between the first brake valve 61 and the second brake valve 63, thereby preventing the oil in the brake 70 from flowing back to the oil tank 10 through the oil circuit between the first brake valve 61 and the second brake valve 63, and ensuring that the manual pump 68 can achieve the release of the braking state of the wheel 300. It can be understood that in some embodiments, when the hydraulic system 100 is running stably, the third brake valve 69 can keep the oil circuit between the first brake valve 61 and the second brake valve 63 open.

[0080] Furthermore, in certain embodiments, when the manual pump 68 pumps the oil in the oil tank 10 into the brake 70, the second brake valve 63 is in the second working position, that is, the oil circuit between the oil pumping mechanism 20 and the brake 70 is connected, and the oil circuit between the oil tank 10 and the brake 70 is closed, thereby preventing the oil in the brake 70 from directly flowing back to the oil tank 10 through the first brake valve 61, thereby ensuring that the manual pump 68 can release the braking state of the wheel 300.

[0081] See also Figure 1 In some embodiments, the vehicle 1000 further includes a cab 500, which is rotatably disposed on the frame 200. As can be seen from the above, the vehicle 1000 can realize operations such as moving forward, moving backward, moving sideways, or turning. If the cab 500 cannot be rotated relative to the frame 200, when the vehicle 1000 moves backward, moves sideways, or turns, the operator may have a blind spot in the field of vision, which will affect driving safety. Therefore, the cab 500 is rotatably disposed on the frame 200, which can reduce the possibility of the operator having a blind spot in the field of vision when operating the vehicle 1000, thereby improving driving safety.

[0082] Specifically, in some embodiments, the cab 500 can be arranged on the frame 200 through a slewing support. The slewing support is a bearing that can simultaneously withstand large axial and radial loads and overturning moments. The slewing support includes a first sub-section (the outer ring of the bearing or the inner ring of the bearing) and a second sub-section (the inner ring of the bearing or the outer ring of the bearing) that are rotatably connected. One of the first sub-section and the second sub-section is connected to the cab 500, and the other is connected to the frame 200. When the first sub-section and the second sub-section rotate relative to each other, the cab 500 can rotate relative to the frame 200.

[0083] See also Figure 1 and Figure 4 In some embodiments, the hydraulic system 100 further includes a swivel joint 95, which is disposed between the cab 500 and the frame 200, and is used to keep the brake lines and circuits between the cab 500 and the frame 200 connected.

[0084] The setting of the swivel joint 95 can prevent the hydraulic and electrical pipelines between the cab 500 and the frame 200 from being disconnected when the cab 500 rotates relative to the frame 200, thereby ensuring the stability of the hydraulic system 100. For example, in some embodiments, the first brake valve 61 can be provided at the cab 500, and the brake 70 can be provided at the wheel 300. The setting of the swivel joint 95 can prevent the oil circuit between the first brake valve 61 and the brake 70 from being entangled and blocked when the cab 500 rotates relative to the frame 200, thereby improving the stability and reliability of the hydraulic system 100.

[0085] It should be noted that, in some embodiments, the swivel joint 95 is used at least to connect the oil circuit between the oil pumping mechanism 20 and the brake mechanism 60 of the hydraulic system 100, the oil circuit between the brake mechanism 60 and the brake 70 of the hydraulic system 100, and the oil circuit between the brake mechanism 60 and the oil tank 10.

[0086] The technical features of the above-mentioned embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification. At the same time, other implementation methods can be derived from the above-mentioned embodiments, so that structural and logical replacements and changes can be made without departing from the scope of this disclosure.

[0087] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A hydraulic system (100), characterized in that: The invention comprises an oil tank (10), an oil pumping mechanism (20), a multi-way valve (30) and an actuator (40), wherein the oil pumping mechanism (20) is connected to the oil tank (10), the multi-way valve (30) is arranged between the oil pumping mechanism (20) and the actuator (40), the actuator (40) comprises a steering unit (41), the steering unit (41) is used to provide power for steering of a wheel (300), and the multi-way valve (30) is used to selectively open or close an oil path between the oil pumping mechanism (20) and the steering unit (41); The hydraulic system (100) further comprises a brake mechanism (60) and a brake (70), wherein the brake mechanism (60) is arranged between the oil pump mechanism (20) and the brake (70), and the brake mechanism (60) is used to selectively open or close the oil path between the oil pump mechanism (20) and the brake (70); The brake mechanism (60) comprises a first brake valve (61) and a second brake valve (63). The first brake valve (61) is arranged between the oil pump mechanism (20) and the brake (70) so as to close the oil path between the oil pump mechanism (20) and the brake (70) and to open the oil path between the brake (70) and the oil tank (10) when the first brake valve (61) is activated. The second brake valve (63) is arranged between the oil pump mechanism (20) and the brake (70) so as to open the oil path between the brake (70) and the oil tank (10). When the second brake valve (63) is activated, the oil circuit between the oil pump mechanism (20) and the brake (70) is closed, and the oil circuit between the brake (70) and the oil tank (10) is opened; when the first brake valve (61) is activated, the oil in the brake (70) can flow back to the oil tank (10) through the second brake valve (63) and the first brake valve (61) in sequence; when the second brake valve (63) is activated, the oil in the brake (70) can flow back to the oil tank (10) through the second brake valve (63).

2. The hydraulic system (100) according to claim 1, characterized in that: The hydraulic system (100) further comprises a locking member (50), wherein the locking member (50) is arranged between the multi-way valve (30) and the steering unit (41), and the locking member (50) is used to limit the movement of the steering unit (41).

3. The hydraulic system (100) according to claim 1, characterized in that: The steering unit (41) comprises a first steering cylinder (411) and a second steering cylinder (413), wherein the first steering cylinder (411) and the second steering cylinder (413) are arranged in parallel.

4. The hydraulic system (100) according to claim 3, characterized in that: The first steering cylinder (411) includes a first rodless chamber oil port (4111) and a first rod chamber oil port (4113); the second steering cylinder (413) includes a second rodless chamber oil port (4131) and a second rod chamber oil port (4133); the first rodless chamber oil port (4111) and the second rodless chamber oil port (4131) are connected in parallel, and the first rod chamber oil port (4113) and the second rod chamber oil port (4133) are connected in parallel.

5. The hydraulic system (100) according to claim 1, characterized in that: The actuator (40) further comprises a lifting cylinder (43), a tilting cylinder (45) and a side-shifting cylinder (47), and the multi-way valve (30) is further used to selectively open or close the oil circuit between the oil pump mechanism (20) and at least one of the lifting cylinder (43), the tilting cylinder (45) and the side-shifting cylinder (47).

6. The hydraulic system (100) according to claim 5, characterized in that: The tilt oil cylinder (45) comprises one, and the multi-way valve (30) comprises a limiting member (31), wherein the limiting member (31) is used to limit the movement of the tilt oil cylinder (45).

7. The hydraulic system (100) according to claim 1, characterized in that: The multi-way valve (30) is a pressure-compensated load-sensitive electric proportional multi-way valve, an electromagnetic reversing multi-way valve or a manual reversing multi-way valve.

8. The hydraulic system (100) according to claim 1, characterized in that: The first brake valve (61) has a first position and a second position. When the first brake valve (61) is activated, the first brake valve (61) is in the first position. When the first brake valve (61) is not activated, the first brake valve (61) is in the second position. The second brake valve (63) has a first working position and a second working position. When the second brake valve (63) is activated, the second brake valve (63) is in the first working position. When the second brake valve (63) is not activated, the second brake valve (63) is in the second working position.

9. The hydraulic system (100) according to claim 1, characterized in that: The hydraulic system (100) further comprises an accumulator (80), wherein the accumulator (80) is arranged between the oil pumping mechanism (20) and the brake mechanism (60), and the accumulator (80) is used to store the oil pumped by the oil pumping mechanism (20) and to deliver the oil to the brake mechanism (60).

10. The hydraulic system (100) according to claim 1, characterized in that: The braking mechanism (60) further comprises: A manual pump (68) is connected between the brake (70) and the oil tank (10), and the manual pump (68) is used to pump oil in the oil tank (10) into the brake (70).

11. The hydraulic system (100) according to claim 10, characterized in that: The brake mechanism (60) further comprises a third brake valve (69), wherein the third brake valve (69) is arranged between the first brake valve (61) of the brake mechanism (60) and the second brake valve (63) of the brake mechanism (60), and the third brake valve (69) is used to selectively open or close the oil circuit between the first brake valve (61) and the second brake valve (63).

12. A vehicle (1000), characterized in that: include: The hydraulic system (100) according to any one of claims 1 to 11.

13. The vehicle (1000) according to claim 12, characterized in that The vehicle (1000) further comprises a vehicle frame (200) and a cab (500), wherein the cab (500) is rotatably arranged on the vehicle frame (200); the hydraulic system (100) further comprises a swivel joint (95), wherein the swivel joint (95) is arranged between the cab (500) and the vehicle frame (200), and the swivel joint (95) is used to keep the brake pipeline and the circuit between the cab (500) and the vehicle frame (200) connected.

14. The vehicle (1000) according to claim 13, characterized in that The swivel joint (95) is used to connect the oil circuit between the oil pump mechanism (20) and the brake mechanism (60) of the hydraulic system (100), the oil circuit between the brake mechanism (60) and the brake (70) of the hydraulic system (100), and the oil circuit between the brake mechanism (60) and the oil tank (10).

Images