CN216343868U - Double-pump oil supply system, gearbox assembly and engineering machinery - Google Patents
Double-pump oil supply system, gearbox assembly and engineering machinery Download PDFInfo
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- CN216343868U CN216343868U CN202122981915.3U CN202122981915U CN216343868U CN 216343868 U CN216343868 U CN 216343868U CN 202122981915 U CN202122981915 U CN 202122981915U CN 216343868 U CN216343868 U CN 216343868U
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Abstract
The utility model relates to the technical field of engineering machinery, in particular to a double-pump oil supply system, a gearbox assembly and engineering machinery. Double pump oil feeding system includes first oil pump, second oil pump, first oil circuit, second oil circuit, third oil circuit and switching-over valve, and the switching-over valve includes: the valve body is provided with a valve core cavity, a first oil inlet, a second oil inlet, a first oil outlet, a second oil outlet and an oil inlet and outlet, a first oil pump is connected with the first oil inlet through a first oil path, a second oil pump is connected with the second oil inlet through a second oil path, one end of a third oil path is connected with the oil inlet and outlet, and the other end of the third oil path is connected with the second oil path; and the valve core is movably arranged in the valve core cavity, and the valve core of the reversing valve is controlled to move through the pressure difference of the first oil pump and the second oil pump, so that the first oil path and the second oil path are communicated or not communicated through the third oil path. The utility model realizes reversing and pressure regulating by one reversing valve, has small number of valves and low cost, and solves the problem of complicated structure caused by three valves.
Description
Technical Field
The utility model relates to the technical field of engineering machinery, in particular to a double-pump oil supply system, a gearbox assembly and engineering machinery.
Background
In the prior art, a gearbox generally supplies oil to a hydraulic system through a mechanical oil pump, the mechanical oil pump is driven by an engine, the oil supply amount of the oil pump is directly related to the rotating speed of the engine, and under the working condition of low rotating speed of the engine, in order to meet the oil supply requirement of the gearbox, the discharge capacity of the mechanical oil pump needs to be designed to be large. However, when the engine rotates at a high speed, the flow rate of the oil pump is far greater than the required flow rate, the oil pump consumes a large amount of engine power, the transmission efficiency of the gearbox is reduced, and the oil consumption of the whole vehicle is increased.
In order to improve the fuel economy of the whole vehicle and reduce the loss of a hydraulic system of the automatic gearbox, more and more hydraulic systems of the automatic gearbox adopt a double-oil-pump oil supply system, the double-oil-pump oil supply system comprises a main pump, an auxiliary pump, an electromagnetic valve, a reversing valve and a switch valve, the auxiliary pump is connected with the reversing valve and the switch valve, the main pump is connected with an inlet of the electromagnetic valve, the reversing valve can be controlled to reverse through the electromagnetic valve, the double-pump oil supply system is matched with three valves for use, the structure is complex, the cost is high, and a main oil way cannot assist an oil way in supplying oil.
SUMMERY OF THE UTILITY MODEL
Therefore, the technical problem to be solved by the utility model is to overcome the defects of complex structure and high cost caused by the cooperation of three valves in the double-pump oil supply system in the prior art, so that the double-pump oil supply system, the gearbox assembly and the engineering machinery are provided.
In order to solve the above problems, the present invention provides a dual-pump oil supply system, including a first oil pump, a second oil pump, a first oil path, a second oil path, a third oil path, and a directional valve, wherein the directional valve includes: the valve body is provided with a valve core cavity, and a first oil inlet, a second oil inlet, a first oil outlet, a second oil outlet and an oil inlet and outlet which are communicated with the valve core cavity; and the valve core is movably arranged in the valve core cavity, and the valve core of the reversing valve is controlled to move through the pressure difference of the first oil pump and the second oil pump, so that the first oil path and the second oil path are communicated or not communicated through the third oil path.
Optionally, a communication channel which can communicate the first oil path and the third oil path is arranged on the valve core; the valve core is provided with a first working position, a second working position and a middle working position between the first working position and the second working position, and when the valve core is positioned at the first working position, the first oil way and the second oil way are communicated with the third oil way through the communication channel; when the valve core is at a second working position, the first oil way and the second oil way are communicated through a third oil way; when the valve core is in the middle working position, the first oil path and the second oil path are not communicated.
Optionally, the reversing valve further includes a first elastic element and a second elastic element disposed on two sides of the valve core, and the valve core is switched among the first working position, the second working position and the middle working position under the action of the first elastic element, the second elastic element, the pressure of the hydraulic oil in the first oil path and the pressure of the hydraulic oil in the second oil path.
Optionally, the first elastic element and the second elastic element are both springs.
Optionally, the oil inlet and outlet is located between the first oil inlet and the second oil inlet, and the communication channel includes a horizontal section and a vertical section.
Optionally, the dual-pump oil supply system further includes an oil tank, a fourth oil path, a fifth oil path, and a first pressure regulating valve, one end of the fourth oil path is connected to the second oil outlet, one end of the fifth oil path is connected to the fourth oil path, and the other end of the fifth oil path is connected to the oil tank, and the first pressure regulating valve is disposed on the fifth oil path.
Optionally, the first pressure regulating valve is an overflow valve.
Optionally, the dual-pump oil supply system further includes a sixth oil path, a seventh oil path, and a second pressure regulating valve, one end of the sixth oil path is connected to the first oil outlet, one end of the seventh oil path is connected to the sixth oil path, and the other end of the seventh oil path is connected to the oil tank, and the second pressure regulating valve is disposed on the seventh oil path.
The utility model also provides a gearbox assembly which comprises a gearbox and the double-pump oil supply system.
The present invention also provides an engineering machine, including: the gearbox assembly is described above.
The utility model has the following advantages: the valve core of the reversing valve is controlled to move through the pressure difference of the two oil pumps, so that the first oil path and the second oil path are communicated or not communicated through the third oil path, when the first oil path and the second oil path are communicated through the third oil path, the pressure of the first oil path and the pressure of the second oil path can be adjusted, the first oil pump can supply oil for the first oil path and the second oil path, or the second oil pump can supply oil for the first oil path and the second oil path; when the first oil way and the second oil way are not communicated, the first oil pump supplies oil to the first oil way, and the second oil pump supplies oil to the second oil way. The double-pump oil supply system can realize reversing and pressure regulating through the reversing valve, the number of the valves is small, the cost is low, the problems that the structure is complex and the cost is high due to the fact that the double-pump oil supply system is matched with three valves are effectively solved, the electromagnetic valve is omitted through the differential pressure control of the two oil pumps, the control is simpler, and the oil supply for two oil paths is ensured simultaneously by the other oil pump under the condition that the oil pump is damaged.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a simplified schematic illustration of the spool of the dual pump oil supply system of the present invention in a neutral operating position;
FIG. 2 is a simplified schematic illustration of the spool of the dual pump oil supply system of FIG. 1 in a first operating position;
fig. 3 shows a simplified schematic diagram of the spool of the dual pump oil supply system of fig. 1 in a second operating position.
Description of reference numerals:
11. a first oil pump; 12. a second oil pump; 21. a first oil passage; 22. a second oil passage; 23. a third oil passage; 24. a fourth oil passage; 25. a fifth oil passage; 26. a sixth oil passage; 27. a seventh oil passage; 30. a diverter valve; 31. a valve body; 311. a spool cavity; 312. a first oil inlet; 313. a second oil inlet; 314. a first oil outlet; 315. a second oil outlet; 316. an oil inlet and an oil outlet; 32. a valve core; 321. a communication channel; 33. a first elastic element; 34. a second elastic element; 40. an oil tank; 51. a first pressure regulating valve; 52. a second pressure regulating valve.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
As shown in fig. 1, the dual-pump oil supply system of the present embodiment includes a first oil pump 11, a second oil pump 12, a first oil passage 21, a second oil passage 22, a third oil passage 23, and a selector valve 30, and the selector valve 30 includes: the valve body 31 is provided with a valve core cavity 311, and a first oil inlet 312, a second oil inlet 313, a first oil outlet 314, a second oil outlet 315 and an oil inlet and outlet 316 which are communicated with the valve core cavity 311, the oil discharge port of the first oil pump 11 is connected with the first oil inlet 312 through a first oil path 21, the oil discharge port of the second oil pump 12 is connected with the second oil inlet 313 through a second oil path 22, one end of a third oil path 23 is connected with the oil inlet and outlet 316, and the other end is connected to the second oil path 22; the spool 32 is movably provided in the spool chamber 311, and the spool 32 of the selector valve 30 is moved by the differential pressure control of the first and second oil pumps 11, 12 to make the first and second oil passages 21, 22 communicate or not communicate through the third oil passage 23.
With the dual-pump oil supply system of the present embodiment, the spool 32 of the selector valve 30 is controlled to move by the pressure difference between the first oil pump 11 and the second oil pump 12, so that the first oil path 21 and the second oil path 22 are communicated or not communicated through the third oil path 23, and when the first oil path 21 and the second oil path 22 are communicated through the third oil path 23, the pressure of the first oil path 21 and the pressure of the second oil path 22 can be adjusted, the first oil pump 11 can supply oil to the first oil path 21 and the second oil path 22, or the second oil pump 12 can supply oil to the first oil path 21 and the second oil path 22; when the first oil passage 21 and the second oil passage 22 are not communicated, the first oil pump 11 supplies oil to the first oil passage 21, and the second oil pump 12 supplies oil to the second oil passage 22. The double-pump oil supply system can realize reversing and pressure regulating through the reversing valve 30, the number of valves is small, the cost is low, the problems that the structure is complex and the cost is high due to the fact that the double-pump oil supply system is used through the cooperation of the three valves are effectively solved, the electromagnetic valve is omitted through the differential pressure control of the two oil pumps, the control is simpler, and the oil supply for the two oil ways can be guaranteed by the other oil pump under the condition that the oil pump is damaged.
In the present embodiment, as shown in fig. 1 to 3, the spool 32 is provided with a communication passage 321 through which the first oil passage 21 and the third oil passage 23 can communicate; the valve core 32 has a first working position, a second working position and an intermediate working position between the first working position and the second working position, and when the valve core 32 is at the first working position, the first oil passage 21 and the second oil passage 22 are communicated with each other through the communication passage 321 and the third oil passage 23; when the spool 32 is at the second operating position, the first oil passage 21 and the second oil passage 22 are communicated through the third oil passage 23; when the spool 32 is at the intermediate operating position, the first oil passage 21 and the second oil passage 22 are not communicated. The valve core 32 divides the valve core cavity 311 into a first cavity and a second cavity, the first oil inlet and the first oil outlet are communicated through the first cavity, the second oil inlet and the second oil outlet are communicated through the second cavity, the total volume of the first cavity and the second cavity is unchanged in the moving process of the valve core 32, the volume of the first cavity and the volume of the second cavity are reduced, specifically, as shown in fig. 2, in the process that the valve core 32 moves to the left, the volume of the first cavity is gradually reduced, the volume of the second cavity is gradually increased, when the communication channel 321 is communicated with the third oil channel 23, hydraulic oil in the second oil channel 22 enters the first cavity through the third oil channel 23 and the communication channel 321, and the second oil pump 12 supplies oil to the first oil channel 21 and the second oil channel 22; as shown in fig. 3, in the process that the spool 32 moves to the right, the volume of the first cavity gradually increases, and the volume of the second cavity gradually decreases, when the spool 32 moves to expose the oil inlet/outlet port 316, the hydraulic oil in the first oil path 21 flows into the second oil path 22 through the third oil path 23, and the first oil pump 11 supplies oil to the first oil path 21 and the second oil path 22.
In this embodiment, the reversing valve 30 further includes a first elastic element 33 and a second elastic element 34 which are disposed on two sides of the spool 32, and under the action of the pressure of the hydraulic oil in the first elastic element 33, the second elastic element 34 and the first oil path 21 and the pressure of the hydraulic oil in the second oil path 22, the spool 32 is switched among the first working position, the second working position and the middle working position, and a driving mechanism for driving the spool 32 to move is not required to be disposed, and the spool 32 can be driven to move according to the pressure of the hydraulic oil in the first oil path 21 and the second oil path 22, so that reversing and pressure regulation of the reversing valve are realized, and the structure is simple. It is understood that in other embodiments, pressure sensors for detecting the pressures of the first oil passage 21 and the second oil passage 22, a driving mechanism for driving the valve element 32 to move, and a controller may be provided, and the controller controls the driving mechanism according to the pressures detected by the pressure sensors.
In this embodiment, the first elastic element 33 and the second elastic element 34 are both springs, which are convenient to use and low in cost.
In the present embodiment, the oil inlet/outlet 316 is located between the first oil inlet 312 and the second oil inlet 313, and the communication channel 321 includes a horizontal section and a vertical section, which is simple in structure and convenient for manufacturing.
In the present embodiment, the dual pump oil supply system further includes an oil tank 40, a fourth oil passage 24, a fifth oil passage 25, and a first pressure regulating valve 51, wherein one end of the fourth oil passage 24 is connected to the second oil outlet 315, one end of the fifth oil passage 25 is connected to the fourth oil passage 24, and the other end is connected to the oil tank 40, and the first pressure regulating valve 51 is provided on the fifth oil passage 25. When the pressure in the second oil passage 22 is higher than the predetermined pressure, the hydraulic oil in the second oil passage 22 is discharged into the oil tank 40 by the first pressure-regulating valve 51, so that the pressure in the second oil passage 22 is maintained within a certain range. Preferably, the first pressure regulating valve 51 is a relief valve, and when the pressure in the second oil passage 22 exceeds a preset pressure of the relief valve, the hydraulic oil in the second oil passage 22 is discharged to the oil tank 40 through the relief valve. It is understood that in other embodiments, the fifth oil passage 25 and the first pressure regulating valve 51 may not be provided.
In the present embodiment, the dual-pump oil supply system further includes a sixth oil passage 26, a seventh oil passage 27, and a second pressure regulating valve 52, one end of the sixth oil passage 26 is connected to the first oil outlet 314, one end of the seventh oil passage 27 is connected to the sixth oil passage 26, and the other end is connected to the oil tank 40, and the second pressure regulating valve 52 is provided in the seventh oil passage 27. When the pressure in the first oil passage 21 is relatively high, the hydraulic oil in the first oil passage 21 is discharged into the oil tank 40 by the second pressure-regulating valve 52, so that the pressure in the first oil passage 21 is maintained within a certain range. Preferably, the second pressure regulating valve 52 is a relief valve, and when the pressure in the first oil passage 21 exceeds a preset pressure of the relief valve, the hydraulic oil in the first oil passage 21 is discharged to the oil tank 40 through the relief valve. It is understood that, in other embodiments, the seventh oil passage 27 and the second pressure regulating valve 52 may not be provided.
The first oil pump 11 is an auxiliary pump, the second oil pump 12 is a main pump, the first oil passage 21 is an auxiliary oil passage, and the second oil passage 22 is a main oil passage. It is understood that, in other embodiments, the first oil pump 11 is a main pump, the second oil pump 12 is an auxiliary pump, the first oil passage 21 is a main oil passage, and the second oil passage 22 is an auxiliary oil passage.
The operation of the dual pump oil supply system is described below with reference to fig. 1 to 3:
when the pressures of the first oil passage 21 and the second oil passage 22 are both within the set range, under the combined action of the oil pressure, the first elastic element 33 and the second elastic element 34, the spool 32 is at the middle working position, the third oil passage 23 is not communicated with the communication passage 321, the first oil passage 21 is not communicated with the second oil passage 22 (as shown in fig. 1), the first oil pump 11 and the second oil pump 12 work independently, the first oil pump 11 only supplies oil to the first oil passage 21, and the second oil pump 12 only supplies oil to the second oil passage 22.
When the pressure in the first oil passage 21 is greater than the set pressure, the spool 32 moves rightward under the combined action of the two elastic elements and the oil pressure, the first oil passage 21, the second oil passage 22, and the third oil passage 23 are communicated, the oil in the first oil passage 21 is discharged to the second oil passage 22, so that the pressure in the first oil passage 21 is maintained within a certain range, the first oil pump 11 simultaneously supplies oil to the first oil passage 21 and the second oil passage 22 (as shown in fig. 3), and if the pressure in the first oil passage 21 is still too high, the pressure can be discharged through the second pressure regulating valve 52.
When the pressure of the first oil passage 21 is smaller than the set pressure, the spool 32 moves leftward under the combined action of the two elastic elements and the oil pressure, the first oil passage 21, the second oil passage 22, the third oil passage 23, and the communication passage 321 communicate with each other, and the oil of the second oil passage 22 is supplied to the first oil passage 21, so that the pressure of the first oil passage 21 is maintained within a certain range, and the second oil pump 12 supplies the first oil passage 21 and the second oil passage 22 with oil at the same time (as shown in fig. 2).
When the pressure in the second oil passage 22 is higher than the set value, the spool 32 moves leftward by the combined action of the two elastic elements and the oil pressure, the first oil passage 21, the second oil passage 22, the third oil passage 23, and the communication passage 321 communicate with each other, the oil in the second oil passage 22 is discharged to the first oil passage 21, so that the pressure in the first oil passage 21 is maintained within a certain range, the second oil pump 12 supplies oil to the first oil passage 21 and the second oil passage 22 at the same time (as shown in fig. 2), and if the pressure in the second oil passage 22 is still too high, the pressure can be discharged by the first pressure-regulating valve.
When the pressure of the second oil passage 22 is smaller than the set value, the spool 32 moves rightward under the pressure, the first oil passage 21, the second oil passage 22, and the third oil passage 23 are communicated, the oil of the first oil passage 21 is discharged to the second oil passage 22, the pressure of the first oil passage 21 is maintained within a certain range, and the first oil pump 11 simultaneously supplies the oil to the first oil passage 21 and the second oil passage 22 (as shown in fig. 3).
The utility model also provides a gearbox assembly which comprises a gearbox and the double-pump oil supply system.
The present invention also provides an engineering machine, including: the gearbox assembly is described above. The position of the valve core 32 is automatically adjusted through the pressure of the hydraulic oil in the first oil way 21 and the pressure of the hydraulic oil in the second oil way 22 through the first elastic element 33, the second elastic element 34, so that the pressures in the first oil way 21 and the second oil way 22 are maintained within a certain range, one reversing valve is used for controlling the work of the two oil pumps, a hydraulic system is simplified, the loss of the hydraulic system is reduced, the fuel economy of the whole vehicle is improved, and if one oil pump fails, the other oil pump can still ensure that the hydraulic system is in a controllable state.
In this embodiment, the engineering machine is an excavator, a rotary drilling rig, a loader, or the like.
From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects:
1. the double oil pump control system comprises a first oil pump 11, a second oil pump 12, a first oil path 21, a second oil path 22, a third oil path 23, a fourth oil path 24, a fifth oil path 25, a first elastic element 33, a second elastic element 34, a reversing valve 30, a first pressure regulating valve 51 and the like, wherein an oil discharge port of the first oil pump 11 is communicated with the first oil path 21, an oil discharge port of the second oil pump 12 is communicated with the second oil path 22, the third oil path 23 is communicated with the second oil path 22, a valve core 32 is provided with a communication channel 321, the communication channel 321 and the third oil path 23 can be communicated or not communicated, so that the first oil path 21 and the second oil path 22 are communicated or not communicated, the first oil pump 11 and the second oil pump 12 can simultaneously supply oil to the first oil path 21 and the second oil path 22 according to pressure, the valve core 32 of the reversing valve 30 is controlled by the pressure difference of the two oil pumps, an electromagnetic valve is eliminated, the control is simpler, the functions of reversing and pressure regulation can be simultaneously realized by one reversing valve, and the other oil pump can supply oil to the two oil ways simultaneously under the condition that one oil pump is damaged.
2. When the pressures of the first oil passage 21 and the second oil passage 22 are within a set range, the valve core 32 is in a middle position under the combined action of the two elastic elements and the oil pressure, so that the third oil passage 23 is separated from the communication passage 321, and the first oil passage 21 and the second oil passage 22 can be isolated; when the pressure of the first oil passage 21 is greater than the set pressure and/or the pressure of the second oil passage 22 is less than the set value, the valve core 32 moves rightwards under the combined action of the two elastic elements and the oil pressure, and the third oil passage 23 enables the first oil passage 21 and the second oil passage 22 to be communicated, so that the pressure of the first oil passage 21 is maintained within a certain range; when the pressure of the first oil passage 21 is less than the set pressure and/or the pressure of the second oil passage 22 is greater than the set value, the spool 32 moves leftward under the combined action of the two elastic elements and the oil pressure, and the third oil passage 23 and the communication passage 321 communicate the first oil passage 21 with the second oil passage 22, so that the pressure in the first oil passage 21 is maintained within a certain range.
3. The fourth oil passage 24 communicates with the fifth oil passage 25, the pressure of the fifth oil passage is regulated by the first pressure regulating valve 51, if the pressure of the second oil passage 22 is still too high, the first pressure regulating valve 51 regulates the pressure of the fifth oil passage 25 to start draining, and the pressures of the first oil passage 21 and the second oil passage 22 can be regulated by the pressure regulating valves.
4. The pressure of the first oil path 21 and the pressure of the second oil path 22 can be adjusted through one reversing valve 30, so that a hydraulic system is simplified, a controller and 2 electromagnetic valves are omitted, and the cost of the hydraulic system is reduced.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the utility model.
Claims (10)
1. The utility model provides a double pump oil feeding system, characterized in that includes first oil pump (11), second oil pump (12), first oil circuit (21), second oil circuit (22), third oil circuit (23) and switching-over valve (30), switching-over valve (30) include:
the valve body (31) is provided with a valve core cavity (311), and a first oil inlet (312), a second oil inlet (313), a first oil outlet (314), a second oil outlet (315) and an oil inlet and outlet (316) which are communicated with the valve core cavity (311), an oil discharge port of the first oil pump (11) is connected with the first oil inlet (312) through the first oil path (21), an oil discharge port of the second oil pump (12) is connected with the second oil inlet (313) through the second oil path (22), one end of the third oil path (23) is connected with the oil inlet and outlet (316), and the other end of the third oil path is connected with the second oil path (22);
and the valve core (32) is movably arranged in the valve core cavity (311), and the valve core (32) of the reversing valve (30) is controlled to move through the pressure difference of the first oil pump (11) and the second oil pump (12), so that the first oil path (21) and the second oil path (22) are communicated or not communicated through the third oil path (23).
2. The dual-pump oil supply system according to claim 1, wherein a communication passage (321) that can communicate the first oil passage (21) and the third oil passage (23) is provided in the spool (32);
the valve core (32) is provided with a first working position, a second working position and an intermediate working position between the first working position and the second working position, and when the valve core (32) is located at the first working position, the first oil passage (21) and the second oil passage (22) are communicated through the communication channel (321) and the third oil passage (23); when the valve core (32) is at the second working position, the first oil path (21) and the second oil path (22) are communicated through the third oil path (23); when the valve core (32) is located at the middle working position, the first oil path (21) and the second oil path (22) are not communicated.
3. The dual pump oil supply system according to claim 2, wherein the selector valve (30) further includes a first elastic member (33) and a second elastic member (34) provided on both sides of the spool (32), and the spool (32) is switched among the first operating position, the second operating position, and the intermediate operating position by the first elastic member (33), the second elastic member (34), the pressure of the hydraulic oil in the first oil passage (21), and the pressure of the hydraulic oil in the second oil passage (22).
4. Double pump oil supply system according to claim 3, characterized in that the first elastic element (33) and the second elastic element (34) are both springs.
5. The dual pump oil supply system of claim 2, wherein the oil inlet/outlet port (316) is located between the first oil inlet port (312) and the second oil inlet port (313), and the communication passage (321) includes a horizontal section and a vertical section.
6. The dual pump oil supply system according to any one of claims 1 to 5, further comprising an oil tank (40), a fourth oil passage (24), a fifth oil passage (25), and a first pressure-regulating valve (51), wherein one end of the fourth oil passage (24) is connected to the second oil outlet (315), one end of the fifth oil passage (25) is connected to the fourth oil passage (24) and the other end is connected to the oil tank (40), and the first pressure-regulating valve (51) is provided on the fifth oil passage (25).
7. Double pump oil supply system according to claim 6, characterized in that the first pressure regulating valve (51) is a relief valve.
8. The dual pump oil supply system according to claim 6, further comprising a sixth oil passage (26), a seventh oil passage (27), and a second pressure regulating valve (52), wherein one end of the sixth oil passage (26) is connected to the first oil outlet (314), one end of the seventh oil passage (27) is connected to the sixth oil passage (26) and the other end thereof is connected to the oil tank (40), and the second pressure regulating valve (52) is provided on the seventh oil passage (27).
9. A gearbox assembly comprising a gearbox and a dual pump oil supply system as claimed in any one of claims 1 to 8.
10. A work machine, comprising: a transmission assembly according to claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122981915.3U CN216343868U (en) | 2021-11-30 | 2021-11-30 | Double-pump oil supply system, gearbox assembly and engineering machinery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122981915.3U CN216343868U (en) | 2021-11-30 | 2021-11-30 | Double-pump oil supply system, gearbox assembly and engineering machinery |
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| Publication Number | Publication Date |
|---|---|
| CN216343868U true CN216343868U (en) | 2022-04-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122981915.3U Active CN216343868U (en) | 2021-11-30 | 2021-11-30 | Double-pump oil supply system, gearbox assembly and engineering machinery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216343868U (en) |
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2021
- 2021-11-30 CN CN202122981915.3U patent/CN216343868U/en active Active
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