Hydraulic system and skid loader with same

Abstract

The utility model relates to the technical field of heat dissipation of hydraulic systems, and discloses a hydraulic system and a skid steer loader with the hydraulic system. An oil inlet of the first radiator is communicated with an oil return opening of the walking pump; an oil inlet of the first one-way valve is communicated with an oil return opening of the walking pump; an oil outlet of the first radiator and an oil outlet of the first one-way valve are both communicated with an oil suction port of the oil supplementing pump, and an oil outlet of the oil supplementing pump is communicated with an oil inlet of the walking pump; an oil inlet of the multi-way valve is communicated with an oil return opening of the working pump; an oil inlet of the second radiator is communicated with an oil outlet of the multi-way valve, and an oil outlet of the second radiator is communicated with an oil inlet of the working pump. According to the hydraulic system, the flow of the working pump and the flow of the oil supplementing pump do not need to be considered, and the heat balance temperature of the hydraulic system is also within the normal range under the small-displacement output working condition of the working pump.

Description

Technical Field

[0001] The utility model relates to the technical field of heat dissipation of hydraulic systems, in particular to a hydraulic system and a skid loader having the same. Background Art

[0002] The hydraulic system in the related technology usually includes a working mechanism hydraulic system and a traveling mechanism hydraulic system. According to the different configurations of the hydraulic system, there are generally two schemes for the hydraulic system: first, the return oil of the working hydraulic system is used as the main heat dissipation oil source; second, the return oil of the traveling hydraulic system casing is used as the main heat dissipation oil source.

[0003] In the first solution, the working pump's displacement needs to be much larger than the travel hydraulic system's charge pump's, and it needs to maintain a high displacement output to ensure the hydraulic system's oil temperature remains within the normal range during operating and running conditions. Continuous output from the working pump wastes energy and is detrimental to system energy conservation.

[0004] In the second solution, when the flow rate of the working hydraulic system is much greater than the flow rate of the oil charge pump, it is impossible to ensure that the oil temperature of the hydraulic system is within the normal range. Utility Model Content

[0005] In view of this, the utility model provides a hydraulic system and a skid steer loader having the same, so as to solve the problem of heat dissipation of the hydraulic system.

[0006] In the first aspect, the utility model provides a hydraulic system, comprising: a travel pump and a working pump; a first radiator, the oil inlet of the first radiator is connected to the oil return port of the travel pump; a first one-way valve, the oil inlet of the first one-way valve is connected to the oil return port of the travel pump; an oil replenishment pump, the oil outlet of the first radiator and the oil outlet of the first one-way valve are both connected to the oil suction port of the oil replenishment pump, and the oil outlet of the oil replenishment pump is connected to the oil inlet of the travel pump; a multi-way valve, the oil inlet of the multi-way valve is connected to the oil return port of the working pump; a second radiator, the oil inlet of the second radiator is connected to the oil outlet of the multi-way valve, and the oil outlet of the second radiator is connected to the oil inlet of the working pump.

[0007] Beneficial effects: The hydraulic system of the present invention, by setting the first radiator and the second radiator, the travel pump and the working pump have their own independent radiators, thereby increasing the heat dissipation efficiency of the hydraulic system and effectively ensuring that the thermal balance temperature of the hydraulic system is within a normal range. Especially under the working condition where the travel pump is the main output and the output of the working pump is relatively small, the thermal balance temperature of the hydraulic system can still be ensured to be within a normal range, and the pressure of the travel pump can be protected from being too high.

[0008] In an optional embodiment, the hydraulic system further includes: a temperature control valve, the oil inlet of the temperature control valve is connected to the oil return port of the travel pump, the first oil outlet of the temperature control valve is connected to the oil inlet of the first radiator, and the second oil outlet of the temperature control valve is connected to the oil suction port of the oil replenishment pump; wherein, when the oil temperature at the oil inlet of the temperature control valve is lower than the first preset temperature, the second oil outlet is connected to the oil inlet of the temperature control valve; when the oil temperature at the oil inlet of the temperature control valve is higher than the second preset temperature, the first oil outlet is connected to the oil inlet of the temperature control valve; when the oil temperature at the oil inlet of the temperature control valve is not less than the first preset temperature and not greater than the second preset temperature, the first oil outlet and the second oil outlet are both connected to the oil inlet of the temperature control valve.

[0009] Beneficial effect: The temperature control valve can switch the working mode according to the oil temperature, taking into account the flow efficiency and oil temperature control efficiency of the hydraulic system.

[0010] In an optional embodiment, the temperature control valve is integrated with a relief valve.

[0011] Beneficial effects: It not only protects the temperature control valve, but also has high integration and reduces the number of parts in the hydraulic system.

[0012] In an optional embodiment, the hydraulic system further includes: a travel motor, the oil inlet of the travel motor is connected to the oil outlet of the travel pump, and the oil inlet of the temperature control valve and the oil inlet of the first one-way valve are both connected to the oil outlet of the travel motor.

[0013] Beneficial effects: not only can the travel motor drive the object to move, but the hydraulic system can also cool, lubricate or hydraulically brake the travel motor, and cool the oil returning from the travel motor, which is beneficial to controlling the temperature of the hydraulic system.

[0014] In an optional embodiment, the hydraulic system further includes: a first filter connected between the oil outlet of the oil charge pump and the oil inlet of the travel pump.

[0015] Beneficial effects: It can reduce the impurities flowing into the oil of the travel pump, reduce the damage probability of the travel pump, extend the service life of the travel pump, and thus ensure the reliability of the hydraulic system.

[0016] In an optional embodiment, the hydraulic system further includes: a second one-way valve, the oil inlet of the second one-way valve is connected to the oil outlet of the multi-way valve, and the oil outlet of the second one-way valve is connected to the oil inlet of the working pump.

[0017] Beneficial effects: It can avoid damage to the second radiator or the multi-way valve caused by excessive pressure difference, reduce the probability of damage to the second radiator and the multi-way valve, and ensure the working stability of the hydraulic system.

[0018] In an optional embodiment, the hydraulic system further includes: a second filter, the oil outlet of the second one-way valve and the oil outlet of the second radiator are both connected to the oil inlet of the second filter, and the oil outlet of the second filter is connected to the oil inlet of the working pump.

[0019] Beneficial effects: It can reduce the impurities flowing into the oil of the working pump, reduce the probability of damage to the working pump, extend the service life of the working pump, and thus ensure the reliability of the hydraulic system.

[0020] In an optional embodiment, the hydraulic system also includes: a third one-way valve, the oil inlet of the third one-way valve is connected to the oil outlet of the multi-way valve, the oil outlet of the third one-way valve is connected to the oil inlet of the working pump, and the opening pressure of the third one-way valve is greater than the opening pressure of the second one-way valve.

[0021] Beneficial effect: The ratio of oil return from the multi-way valve passing through the second radiator can be increased, which is used to adjust the heat dissipation of the hydraulic system.

[0022] In an optional embodiment, the hydraulic system further includes: an oil tank, and the oil suction port of the oil replenishing pump and the oil inlet of the working pump are both connected to the oil tank.

[0023] Beneficial effect: The oil tank plays the role of storing oil. On the one hand, it can ensure that the hydraulic system has sufficient oil to ensure stable operation of the hydraulic system. On the other hand, it avoids excessive oil on the working pump or the oil replenishment pump, ensuring that the pressure of the hydraulic system is within the normal range.

[0024] In a second aspect, the present invention further provides a skid steer loader comprising the hydraulic system described in the first aspect.

[0025] Beneficial effect: The skid steer loader can ensure that the thermal equilibrium temperature is within a normal range under all working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0027] Figure 1 This is a connection diagram of the hydraulic system of an embodiment of the present utility model.

[0028] Description of reference numerals:

[0029] 1. Hydraulic system;

[0030] 100, travel pump; 110, first radiator; 120, first one-way valve; 130, oil charge pump; 140, temperature control valve; 141, first oil outlet; 142, second oil outlet; 150, travel motor; 160, first filter;

[0031] 200, working pump; 210, multi-way valve; 220, second radiator; 230, second one-way valve; 240, second filter; 250, third one-way valve;

[0032] 300. Fuel tank. DETAILED DESCRIPTION

[0033] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0034] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention 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 to the present invention.

[0035] In the description of the present invention, the meaning of "plurality" is two or more. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0036] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0037] The following combination Figure 1 , describing the embodiments of the present utility model.

[0038] According to an embodiment of the present invention, on the one hand, a hydraulic system 1 is provided, which includes a travel pump 100, a working pump 200, a first radiator 110, a first one-way valve 120, an oil replenishment pump 130, a multi-way valve 210 and a second radiator 220.

[0039] The oil inlet of the first radiator 110 is connected to the oil return port of the travel pump 100, the oil inlet of the first one-way valve 120 is connected to the oil return port of the travel pump 100, the oil outlet of the first radiator 110 and the oil outlet of the first one-way valve 120 are both connected to the oil suction port of the oil replenishment pump 130, the oil outlet of the oil replenishment pump 130 is connected to the oil inlet of the travel pump 100, the oil inlet of the multi-way valve 210 is connected to the oil return port of the working pump 200, the multi-way valve 210 distributes the oil to each actuator so that the mechanism with the hydraulic system 1 can work, the oil inlet of the second radiator 220 is connected to the oil outlet of the multi-way valve 210, and the oil outlet of the second radiator 220 is connected to the oil inlet of the working pump 200.

[0040] For example, the travel pump 100 can be controlled by electric proportional displacement control, hydraulic control, or mechanical control. The working pump 200 can be controlled by electric proportional displacement control, hydraulic control, or mechanical control. The multi-way valve 210 can be controlled electrically or hydraulically.

[0041] By setting the first one-way valve 120, when the pressure of the oil return port of the travel pump 100 is P1, the pressure of the oil suction port of the oil replenishing pump 130 is P2, and the opening pressure of the first one-way valve 120 is P3, when P1-P2≤P3, the first one-way valve 120 is closed, and the oil flowing out of the oil return port of the travel pump 100 can flow to the oil suction port of the oil replenishing pump 130 through the first radiator 110, thereby achieving the cooling of the return oil of the travel pump 100 and ensuring that the oil flowing into the travel pump 100 again is the cooled oil; when P1-P2>P3, the first one-way valve 120 is opened, and the oil flowing out of the oil return port of the travel pump 100 can flow to the oil suction port of the oil replenishing pump 130 through the first one-way valve 120, thereby avoiding excessive pressure of the travel pump 100 causing damage to the travel pump 100 and improving the service life of the hydraulic system 1.

[0042] By providing the first radiator 110 and the second radiator 220, the travel pump 100 and the working pump 200 have their own independent radiators, which increases the heat dissipation efficiency of the hydraulic system 1 and effectively ensures that the thermal equilibrium temperature of the hydraulic system 1 is within a normal range. Especially under the working condition where the travel pump 100 mainly outputs, when the output of the working pump 200 is relatively small, it can still ensure that the thermal equilibrium temperature of the hydraulic system 1 is within a normal range, and can protect the pressure of the travel pump 100 from being too high.

[0043] like Figure 1 As shown, in the technical solution of this embodiment, the hydraulic system 1 further includes a temperature control valve 140, the oil inlet of the temperature control valve 140 is connected to the oil return port of the travel pump 100, the first oil outlet 141 of the temperature control valve 140 is connected to the oil inlet of the first radiator 110, and the second oil outlet 142 of the temperature control valve 140 is connected to the oil suction port of the charge pump 130. Specifically, when the oil temperature T at the oil inlet of the temperature control valve 140 is lower than the first preset temperature T1, the first oil outlet 141 is connected to the oil inlet of the temperature control valve 140; when the oil temperature T at the oil inlet of the temperature control valve 140 is higher than the second preset temperature T2, the second oil outlet 142 is connected to the oil inlet of the temperature control valve 140; when the oil temperature T at the oil inlet of the temperature control valve 140 is not lower than the first preset temperature T1 and not higher than the second preset temperature T2, both the first oil outlet 141 and the second oil outlet 142 are connected to the oil inlet of the temperature control valve 140.

[0044] That is, when T<T1 and P1-P2≤P3, the oil returned from the travel pump 100 can flow directly to the oil suction port of the oil charge pump 130 through the oil inlet and the second oil outlet 142 of the temperature control valve 140;

[0045] When T<T1 and P1-P2>P3, the oil returned from the travel pump 100 is divided into two parts. One part flows directly to the oil suction port of the oil replenishment pump 130 through the oil inlet and the second oil outlet 142 of the temperature control valve 140, and the other part flows to the oil suction port of the oil replenishment pump 130 through the first one-way valve 120.

[0046] When T1≤T<T2, and P1-P2≤P3, the oil returning from the travel pump 100 is divided into two parts. One part flows through the oil inlet of the temperature control valve 140, the first oil outlet 141, and the first radiator 110 to the oil suction port of the oil charge pump 130, and the other part flows through the oil inlet and the second oil outlet 142 of the temperature control valve 140 to the oil suction port of the oil charge pump 130.

[0047] When T1≤T<T2, and P1-P2>P3, the oil returned from the travel pump 100 is divided into three parts. The first part flows to the oil suction port of the charge pump 130 through the oil inlet of the temperature control valve 140, the first oil outlet 141, and the first radiator 110. The second part flows to the oil suction port of the charge pump 130 through the oil inlet and the second oil outlet 142 of the temperature control valve 140. The third part flows to the oil suction port of the charge pump 130 through the first one-way valve 120.

[0048] When T2≤T and P1-P2≤P3, the oil returned from the travel pump 100 flows through the oil inlet of the temperature control valve 140, the first oil outlet 141 and the first radiator 110 to the oil suction port of the oil charge pump 130;

[0049] When T2≤T and P1-P2>P3, the oil refluxed from the travel pump 100 is divided into two parts. One part flows to the oil suction port of the oil replenishment pump 130 through the oil inlet of the temperature control valve 140, the first oil outlet 141 and the first radiator 110, and the other part flows to the oil suction port of the oil replenishment pump 130 through the first one-way valve 120.

[0050] When the temperature in the hydraulic system 1 is low, the oil flowing out of the oil return port of the travel pump 100 does not need to be cooled. Therefore, the oil flowing out of the oil return port of the travel pump 100 can be directly returned to the oil charge pump 130 without passing through the first heat dissipation valve, thereby improving the efficiency of the oil flow in the hydraulic system 1 and reducing the amount of oil overflowing the first radiator 110, thereby extending the service life of the first radiator 110.

[0051] When the temperature in the hydraulic system 1 is at a medium temperature, part of the oil flowing out of the oil return port of the travel pump 100 can flow back to the oil charge pump 130 through the first radiator 110, and the other part can flow directly back to the oil charge pump 130 without passing through the first radiator 110. This ensures the efficiency of the oil flow in the hydraulic system 1 while cooling the oil to ensure that the temperature in the hydraulic system 1 does not become too high.

[0052] When the temperature in the hydraulic system 1 is high, the oil flowing out of the oil return port of the travel pump 100 completely passes through the first radiator 110 and directly returns to the oil charge pump 130, thereby cooling the oil to the maximum extent and fully controlling the temperature in the hydraulic system 1.

[0053] By setting the temperature control valve 140, the temperature control valve 140 can automatically switch the working mode according to the oil temperature, taking into account the flow efficiency and oil temperature control efficiency of the hydraulic system 1, thereby improving the intelligence level of the hydraulic system 1 and making the use of the hydraulic system 1 more convenient.

[0054] like Figure 1 As shown, in the technical solution of this embodiment, the temperature control valve 140 is integrated with a relief valve. The relief valve is used to limit the maximum pressure and flow of the temperature control valve 140, thereby protecting the temperature control valve 140. Since the relief valve is integrated into the temperature control valve 140, the number of parts in the hydraulic system 1 can be reduced, the installation process is simplified, and production efficiency is improved.

[0055] like Figure 1 As shown, in the technical solution of this embodiment, the hydraulic system 1 also includes a travel motor 150, the oil inlet of the travel motor 150 is connected to the oil outlet of the travel pump 100, and the oil inlet of the temperature control valve 140 and the oil inlet of the first one-way valve 120 are both connected to the oil outlet of the travel motor 150.

[0056] For example, the travel motor 150 has a housing with an oil passage disposed therein. The oil inlet of the oil passage is connected to the oil outlet of the travel pump 100. The oil inlet of the temperature control valve 140 and the oil inlet of the first one-way valve 120 are both connected to the oil outlet of the oil passage. There may be two travel motors 150, and the travel pump 100 includes two gear pumps connected in series. The two gear pumps supply oil to the two travel motors 150, respectively. The travel motors 150 may be dual-speed motors or single-speed motors.

[0057] By setting the first one-way valve 120, when the pressure at the oil outlet of the travel pump 100 is P1, the pressure at the oil outlet of the travel motor 150 is P4, the pressure at the oil suction port of the oil replenishment pump 130 is P2, and the opening pressure of the first one-way valve 120 is P3, when P1+P4-P2>P3, the first one-way valve 120 opens, and the oil flowing out of the oil outlet of the travel pump 100 and the oil outlet of the travel motor 150 can flow to the oil suction port through the first one-way valve 120, thereby avoiding damage to the travel pump 100 and the travel motor 150 due to excessive pressure in the travel pump 100, thereby improving the service life of the hydraulic system 1.

[0058] In combination with the temperature control valve 140 , it can be seen that when T<T1 and P1+P4-P2≤P3, the oil returning from the travel pump 100 and the travel motor 150 can flow directly to the oil suction port of the oil charge pump 130 through the oil inlet and the second oil outlet 142 of the temperature control valve 140 ;

[0059] When T<T1 and P1+P4-P2>P3, the oil returning from the travel pump 100 and the travel motor 150 is divided into two parts. One part flows directly to the oil suction port of the oil charge pump 130 through the oil inlet and the second oil outlet 142 of the temperature control valve 140, and the other part flows to the oil suction port of the oil charge pump 130 through the first one-way valve 120.

[0060] When T1≤T<T2, and P1+P4-P2≤P3, the oil returning from the travel pump 100 and the travel motor 150 is divided into two parts. One part flows through the oil inlet of the temperature control valve 140, the first oil outlet 141, and the first radiator 110 to the oil suction port of the oil charge pump 130, and the other part flows through the oil inlet and the second oil outlet 142 of the temperature control valve 140 to the oil suction port of the oil charge pump 130.

[0061] When T1≤T<T2, and P1+P4-P2>P3, the oil returning from the travel pump 100 and the travel motor 150 is divided into three parts. The first part flows to the oil suction port of the oil charge pump 130 through the oil inlet of the temperature control valve 140, the first oil outlet 141, and the first radiator 110. The second part flows to the oil suction port of the oil charge pump 130 through the oil inlet and the second oil outlet 142 of the temperature control valve 140. The third part flows to the oil suction port of the oil charge pump 130 through the first one-way valve 120.

[0062] When T2≤T and P1+P4-P2≤P3, the oil returned from the travel pump 100 and the travel motor 150 flows to the oil suction port of the oil charge pump 130 through the oil inlet of the temperature control valve 140, the first oil outlet 141 and the first radiator 110;

[0063] When T2≤T and P1+P4-P2>P3, the oil returning from the travel pump 100 and the travel motor 150 is divided into two parts. One part flows to the oil suction port of the oil replenishment pump 130 through the oil inlet of the temperature control valve 140, the first oil outlet 141 and the first radiator 110, and the other part flows to the oil suction port of the oil replenishment pump 130 through the first one-way valve 120.

[0064] By setting up the travel motor 150, not only can the travel motor 150 be used to drive the object to move, but the travel motor 150 can also be cooled, lubricated or hydraulically braked through the hydraulic system 1, and the oil returning from the travel motor 150 can be cooled, which is beneficial to controlling the temperature of the hydraulic system 1.

[0065] like Figure 1 As shown, in the technical solution of this embodiment, the hydraulic system 1 further includes a first filter 160, which is connected between the oil outlet of the charge pump 130 and the oil inlet of the travel pump 100. This can reduce impurities in the oil flowing into the travel pump 100, reduce the probability of damage to the travel pump 100, extend the service life of the travel pump 100, and thus ensure the reliability of the hydraulic system 1.

[0066] like Figure 1 As shown, in the technical solution of this embodiment, the hydraulic system 1 also includes a second one-way valve 230, the oil inlet of the second one-way valve 230 is connected to the oil outlet of the multi-way valve 210, and the oil outlet of the second one-way valve 230 is connected to the oil inlet of the working pump 200.

[0067] Specifically, the pressure of the oil outlet of the multi-way valve 210 is T5, the pressure of the oil inlet of the working pump 200 is T6, the opening pressure of the second one-way valve 230 is T7, T5-T6≤T7, the second one-way valve 230 is closed, and the oil flowing back from the multi-way valve 210 flows to the working pump 200 through the second radiator 220; T5-T6>T7, the second one-way valve 230 is opened, and the oil flowing back from the multi-way valve 210 is divided into two parts, one part flows to the working pump 200 through the second radiator 220, and the other part flows to the working pump 200 through the second one-way valve 230. This can avoid damage to the second radiator 220 or the multi-way valve 210 caused by excessive pressure difference, reduce the probability of damage to the second radiator 220 and the multi-way valve 210, and ensure the working stability of the hydraulic system 1.

[0068] like Figure 1 As shown, in the technical solution of this embodiment, the hydraulic system 1 also includes a second filter 240, the oil outlet of the second one-way valve 230 and the oil outlet of the second radiator 220 are both connected to the oil inlet of the second filter 240, and the oil outlet of the second filter 240 is connected to the oil inlet of the working pump 200.

[0069] In this way, impurities flowing into the oil of the working pump 200 can be reduced, the probability of damage to the working pump 200 can be reduced, the service life of the working pump 200 can be extended, and the reliability of the hydraulic system 1 can be ensured.

[0070] like Figure 1 As shown, in the technical solution of this embodiment, the hydraulic system 1 also includes a third one-way valve 250, the oil inlet of the third one-way valve 250 is connected to the oil outlet of the multi-way valve 210, and the oil outlet of the third one-way valve 250 is connected to the oil inlet of the working pump 200.

[0071] The pressure of the oil outlet of the multi-way valve 210 is T5, the pressure of the oil inlet of the working pump 200 is T6, the opening pressure of the second one-way valve 230 is T7, and the opening pressure of the third one-way valve 250 is T8.

[0072] T5-T6≤T7, the second one-way valve 230 and the third one-way valve 250 are opened, and the oil returned by the multi-way valve 210 flows to the working pump 200 through the second radiator 220; T8>T5-T6>T7, the second one-way valve 230 is opened, the third one-way valve 250 is closed, and the oil returned by the multi-way valve 210 is divided into two parts, one part flows to the working pump 200 through the second radiator 220, and the other part flows to the working pump 200 through the second one-way valve 230; T5-T6>T8, the oil returned by the multi-way valve 210 is divided into three parts, the first part flows to the working pump 200 through the second radiator 220, the second part flows to the working pump 200 through the second one-way valve 230, and the third part flows to the working pump 200 through the third one-way valve 250.

[0073] In this way, the setting of the third one-way valve 250 effectively distinguishes the pressure difference between the oil outlet of the multi-way valve 210 and the oil inlet of the working pump 200, and increases the proportion of return oil from the multi-way valve 210 passing through the second radiator 220 while ensuring the safety of the second radiator 220 and the multi-way valve 210, which is used to adjust the heat dissipation of the hydraulic system 1.

[0074] like Figure 1 As shown, in the technical solution of this embodiment, the hydraulic system 1 further includes an oil tank 300 , and the oil suction port of the oil replenishment pump 130 and the oil inlet of the working pump 200 are both connected to the oil tank 300 .

[0075] When the amount of oil returned from the travel pump 100 and travel motor 150 housings exceeds the amount required for the charge pump 130 to draw oil, the excess oil flows back into the oil tank 300. When the amount of oil returned from the travel pump 100 and travel motor 150 housings is less than the amount required for the charge pump 130 to draw oil, the charge pump 130 draws oil from the oil tank 300. When the amount of oil returned from the multi-way valve 210 exceeds the flow rate required for the working pump 200 to draw oil, the excess oil returns to the oil tank 300. When the amount of oil returned from the multi-way valve 210 is less than the flow rate required for the working pump 200 to draw oil, the working pump 200 draws oil from the oil tank 300.

[0076] In this way, the oil tank 300 plays the role of storing oil. On the one hand, it can ensure that the hydraulic system 1 has sufficient oil to ensure stable operation of the hydraulic system 1. On the other hand, it avoids excessive oil volume on the working pump 200 or the oil replenishing pump 130 to ensure that the pressure of the hydraulic system 1 is within a normal range.

[0077] According to an embodiment of the present invention, on the other hand, a skid steer loader is provided. The skid steer loader includes the hydraulic system 1 described above.

[0078] Specifically, a skid-steer loader is a small, multifunctional construction machine characterized by its small dimensions and compact structure. It utilizes the linear speed difference between the wheels on either side to achieve steering, enabling 360° on-the-spot steering. Skid-steer loaders are suitable for operations in confined spaces such as urban infrastructure, roads, construction sites, factory workshops, warehouses, docks, ship decks, and even inside ship cabins. A variety of attachments can be quickly swapped out to adapt to different work environments and meet diverse operational needs.

[0079] The skid steer loader of the embodiment of the present invention utilizes the hydraulic system 1 to ensure that the thermal equilibrium temperature is within a normal range under all working conditions.

[0080] Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations shall fall within the scope defined by the appended claims.

Claims

1. A hydraulic system, characterized in that: include: Travel pump (100) and working pump (200); a first radiator (110), wherein an oil inlet of the first radiator (110) is connected to an oil return port of the travel pump (100); a first one-way valve (120), wherein an oil inlet of the first one-way valve (120) is connected to an oil return port of the travel pump (100); An oil replenishing pump (130), wherein the oil outlet of the first radiator (110) and the oil outlet of the first one-way valve (120) are both connected to the oil suction port of the oil replenishing pump (130), and the oil outlet of the oil replenishing pump (130) is connected to the oil inlet of the travel pump (100); a multi-way valve (210), wherein the oil inlet of the multi-way valve (210) is connected to the oil return port of the working pump (200); A second radiator (220), wherein the oil inlet of the second radiator (220) is communicated with the oil outlet of the multi-way valve (210), and the oil outlet of the second radiator (220) is communicated with the oil inlet of the working pump (200).

2. The hydraulic system according to claim 1, characterized in that Also includes: a temperature control valve (140), wherein the oil inlet of the temperature control valve (140) is communicated with the oil return port of the travel pump (100), the first oil outlet (141) of the temperature control valve (140) is communicated with the oil inlet of the first radiator (110), and the second oil outlet (142) of the temperature control valve (140) is communicated with the oil suction port of the oil replenishment pump (130); When the oil temperature at the oil inlet of the temperature control valve (140) is lower than a first preset temperature, the second oil outlet is communicated with the oil inlet of the temperature control valve (140); When the oil temperature at the oil inlet of the temperature control valve (140) is higher than a second preset temperature, the first oil outlet (141) is communicated with the oil inlet of the temperature control valve (140); When the oil temperature at the oil inlet of the temperature control valve (140) is not less than the first preset temperature and not greater than the second preset temperature, the first oil outlet (141) and the second oil outlet (142) are both communicated with the oil inlet of the temperature control valve (140).

3. The hydraulic system according to claim 2, characterized in that The temperature control valve (140) is integrated with a relief valve.

4. The hydraulic system according to claim 2, characterized in that Also includes: A travel motor (150), wherein the oil inlet of the travel motor (150) is connected to the oil outlet of the travel pump (100), and the oil inlet of the temperature control valve (140) and the oil inlet of the first one-way valve (120) are both connected to the oil outlet of the travel motor (150).

5. The hydraulic system according to claim 1, characterized in that Also includes: A first filter (160) is connected between the oil outlet of the oil replenishment pump (130) and the oil inlet of the travel pump (100).

6. The hydraulic system according to claim 1, characterized in that Also includes: A second one-way valve (230), wherein the oil inlet of the second one-way valve (230) is communicated with the oil outlet of the multi-way valve (210), and the oil outlet of the second one-way valve (230) is communicated with the oil inlet of the working pump (200).

7. The hydraulic system according to claim 6, characterized in that Also includes: The second filter (240), the oil outlet of the second one-way valve (230) and the oil outlet of the second radiator (220) are all in communication with the oil inlet of the second filter (240), and the oil outlet of the second filter (240) is in communication with the oil inlet of the working pump (200).

8. The hydraulic system according to claim 7, characterized in that: Also includes: A third one-way valve (250), wherein the oil inlet of the third one-way valve (250) is communicated with the oil outlet of the multi-way valve (210), the oil outlet of the third one-way valve (250) is communicated with the oil inlet of the working pump (200), and the opening pressure of the third one-way valve (250) is greater than the opening pressure of the second one-way valve (230).

9. The hydraulic system according to any one of claims 1 to 8, characterized in that: Also includes: The oil tank (300) is connected to the oil tank (300). The oil suction port of the oil replenishment pump (130) and the oil inlet of the working pump (200) are both in communication with the oil tank (300).

10. A skid steer loader, characterized in that: Comprising a hydraulic system (1) according to any one of claims 1-9.

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