Transmission case

Abstract

The utility model discloses a transmission case which comprises a case body and a gear set arranged in the case body, a first oil pump, a first oil storage cavity and a second oil storage cavity are further arranged in the case body, and the first oil storage cavity and the second oil storage cavity are mutually independent. The first oil storage cavity is formed in the bottom of the box body, at least one gear in the gear set is partially soaked in lubricating oil in the first oil storage cavity, and when the gear rotates, the first oil pump pumps the lubricating oil in the first oil storage cavity into the second oil storage cavity; lubricating oil in the second oil storage cavity can be conveyed to the position, needing to be lubricated, in the box body. According to the transmission case, the two oil storage cavities are formed in the case body, and the lubricating oil in one oil storage cavity is pumped to the position, needing to be lubricated, in the case body through the oil pump, so that compared with a gear splash lubrication mode in the prior art, targeted lubrication can be achieved, and oil stirring loss is low.

Description

TECHNICAL FIELD

[0001] The utility model relates to transmission case technical field, especially transmission case. BACKGROUND

[0002] At present, the cooling and lubricating mode used by the parallel range-extending transmission case or gear box of passenger car is usually gear splash lubrication. Gear splash lubrication is a lubrication mode that lubricating oil is splashed to the parts needing lubrication by high-speed rotating gears, and the working principle is that the lubricating oil is stored in the oil pool of the transmission case, when the gears rotate at high speed, the lubricating oil in the oil pool is stirred to splash, and the splashed lubricating oil is brought to the parts needing lubrication. However, this lubrication mode is greatly affected by the gear rotation speed and the amount of lubricating oil, and for some parts far away from the oil pool, sufficient lubrication may not be obtained, resulting in poor cooling and lubrication effect, and a large number of oil blocking structures need to be arranged in the box body to guide the lubricating oil to the positions such as bearings needing lubrication, which increases the design difficulty of the box body, and at the same time, due to the immersion of the gears in the lubricating oil, there is a large oil stirring loss during operation.

[0003] Therefore, it is necessary to improve the structure of the lubrication system of the transmission case in the prior art, so that the parts in the transmission case are not affected by the gear rotation speed during lubrication, the cooling and lubrication efficiency is high, the overall structure does not need to increase a large number of oil blocking structures on the box body, the structure is compact and simple, the design difficulty of the box body is not increased, and the oil stirring loss is reduced. SUMMARY

[0004] Therefore, the purpose of the utility model is to provide a transmission case, which is not affected by the gear rotation speed during lubrication of the parts in the transmission case, has high cooling and lubrication efficiency, and does not need to increase a large number of oil blocking structures on the box body in the overall structure, so that the structure is compact and simple, the design difficulty of the box body is not increased, and the transmission case has low oil stirring loss during operation.

[0005] The transmission case of the utility model, comprising a box body and a gear set arranged in the box body, a first oil pump, and a first oil storage cavity and a second oil storage cavity independent of each other are further arranged in the box body.

[0006] The first oil storage cavity is arranged at the bottom of the box body, at least one gear in the gear set is partially immersed in the lubricating oil in the first oil storage cavity, when the gear rotates, the first oil pump pumps the lubricating oil in the first oil storage cavity into the second oil storage cavity.

[0007] The lubricating oil in the second oil storage cavity can be transported to the positions needing lubrication in the box body.

[0008] By setting two oil storage cavities, when the gear rotates, the first oil pump can pump the lubricating oil in the first oil storage cavity to the second oil storage cavity, so as to quickly reduce the liquid level in the first oil storage cavity and reduce the oil stirring loss when the gear in the transmission case operates. At the same time, the lubricating oil in the second oil storage cavity can be transported to the positions in the case that need to be lubricated, compared with the gear splash lubrication of the prior art, targeted lubrication of the parts in the transmission case that need to be lubricated can be realized, and the lubrication efficiency can be improved.

[0009] Further, the second oil pump is further provided in the case, an oil inlet of the second oil pump is communicated with the second oil storage cavity, an oil outlet of the second oil pump is communicated with a main lubricating oil circuit, and the main lubricating oil circuit is respectively directed to positions in the case that need to be lubricated through a plurality of branch lubricating oil circuits. Through the cooperation of the second oil pump and the branch lubricating oil circuit, targeted lubrication of the parts in the case that need to be lubricated can be realized, and the lubrication effect and the lubrication efficiency can be improved.

[0010] Further, the oil inlet of the second oil pump is further communicated with the first oil storage cavity.

[0011] Further, the case is further provided with an oil circuit selector, and the second oil pump is selected to be communicated with the first oil storage cavity or the second oil storage cavity through the oil circuit selector. By setting the oil circuit selector, the second oil pump can be selected to be communicated with the first oil storage cavity or the second oil storage cavity, which is beneficial to quickly reduce the liquid level in the first oil storage cavity and reduce the oil stirring loss.

[0012] Further, the oil circuit selector comprises a body, a communication chamber is arranged in the body, the communication chamber is provided with a first oil inlet and a second oil inlet, a first oil outlet and a second oil outlet are arranged corresponding to the first oil inlet and the second oil inlet, the first oil inlet and the second oil inlet are respectively communicated with the first oil storage cavity and the second oil storage cavity, and the first oil outlet and the second oil outlet are both communicated with the oil inlet of the second oil pump.

[0013] At least one end of the communication chamber is provided with an electromagnet, a valve core is movably arranged in the communication chamber in the axial direction, the valve core has magnetism, and the valve core is provided with a connection channel for communicating the first oil inlet and the first oil outlet or the second oil inlet and the second oil outlet. By conducting the current of the electromagnet, the valve core is driven to move, so that the overall structure is simple.

[0014] Further, the diameter size of the middle section of the communication chamber is greater than the diameter size of the two ends of the communication chamber, and the diameter size of the valve core is matched with the diameter size of the middle section of the communication chamber. By making the diameter size of the middle section of the communication chamber greater than the diameter size of the two ends of the communication chamber, the valve core can be communicated with the first oil outlet and the first oil inlet or the second oil outlet and the second oil inlet when moving left and right.

[0015] Further, the valve core one end is equipped with the guide rod which is axial parallel with the communication chamber, the communication chamber is equipped with the mounting seat, and the guide rod is slidably arranged in the mounting seat. The guide rod and the mounting seat are arranged, so that the valve core is mainly subjected to the axial force of the communication chamber when the valve core moves, and the friction between the valve core and the inner wall of the communication chamber is reduced.

[0016] Further, the outer peripheral wall of the valve core and the inner wall of the communication chamber are sealed by the sealing ring, and the sealing ring is arranged in two, and the two sealing rings are arranged on the two sides of the connecting channel. The sealing ring is arranged to avoid the leakage of lubricating oil in the communication chamber.

[0017] Further, the second oil storage cavity is arranged above the first oil storage cavity. The second oil storage cavity is arranged above the first oil storage cavity, so that the appearance size of the box body is not improved, and the design difficulty of the box body is reduced.

[0018] Further, the first oil pump is in gear transmission connection with the lubricating oil partially immersed in the first oil storage cavity. The first oil pump is driven to work by the movement of the gear, so that a separate driving structure is not arranged, and the structure is compact.

[0019] Compared with the prior art, the utility model has the advantages that:

[0020] 1. The utility model discloses a transmission box, which comprises a box body, a first oil storage cavity and a second oil storage cavity arranged in the box body, a first oil pump arranged in the first oil storage cavity, a second oil pump arranged in the second oil storage cavity, a gear transmission connection between the first oil pump and the second oil pump, and a valve core arranged in the box body and connected with the first oil pump and the second oil pump.

[0021] 2. The lubricating oil in one of the oil storage cavities is delivered to the position needing lubrication in the box body, so that compared with the gear splash lubrication of the prior art, the cooling and lubricating efficiency is high, the position needing lubrication in the box body can be fully lubricated, the cooling and lubricating effect is good, and too many oil retaining structures do not need to be arranged on the box body, and the machining difficulty of the box body is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0022] The utility model will be further described below in combination with the drawings and examples:

[0023] Figure 1 It is the structure schematic view of the transmission box of the utility model;

[0024] Figure 2 It is Figure 1 It is the structure schematic view when hiding partial components;

[0025] Figure 3 It is the structure diagram of the lubricating system in the transmission box;

[0026] Figure 4 Structure diagram of oil path selector;

[0027] In the above drawings, the following reference signs are used:

[0028] 1, box body; 2, second oil pump; 3, second oil storage chamber; 4, communication oil path I; 5, communication oil path II; 6, first oil storage chamber; 7, first oil pump; 8, gear; 9, communication oil path III; 10, oil path selector; 101, sealing ring; 102, first oil inlet; 103, valve core; 1031, connecting channel; 104, second oil inlet; 105, mounting seat; 106, communication chamber; 1061, middle section; 107, guide rod; 108, second oil outlet; 109, first oil outlet; 11, main lubricating oil path; 12, branch lubricating oil path; 13, first gear; 14, second gear; 15, third gear; 16, fourth gear; 17, liquid level sensor. DETAILED DESCRIPTION

[0029] In the prior art, the transmission box adopts the gear splash lubrication mode, and the lubrication effect is greatly affected by the gear rotation speed and the lubricating oil amount. For some components far away from the oil pool, sufficient lubrication may not be obtained, the cooling and lubrication effect is poor, and a large number of oil blocking structures need to be arranged in the box body to guide the lubricating oil to the positions that need to be lubricated such as bearings, the design difficulty of the box body is increased, and there is a large oil stirring loss.

[0030] As shown in Figures 1-4 , the transmission box provided by the embodiment of the present application comprises a box body 1 and a gear set arranged in the box body 1, and a first oil pump 7 and a first oil storage chamber 6 and a second oil storage chamber 3 that are independent of each other are further arranged in the box body 1. The first oil storage chamber 6 and the second oil storage chamber 3 can store lubricating oil, the first oil pump 7 is used for pumping the lubricating oil in the first oil storage chamber 6 to the second oil storage chamber 3, the second oil storage chamber 3 has an independent chamber and is sealed relative to other components in the box body 1, so that when the transmission box is subjected to an external force, the lubricating oil in the second oil storage chamber 3 is prevented from returning to the first oil storage chamber 6 under the action of the external force, and the lubricating oil level in the first oil storage chamber 6 is prevented from being reduced at a high speed.

[0031] The first oil storage chamber 6 is arranged at the bottom of the box body 1, and at least one gear in the gear set is partially immersed in the lubricating oil in the first oil storage chamber 6. For example, in a feasible embodiment, when the gear set is arranged in the box body 1 in the structure as shown in Figure 1 , the bottom of the gear 8 is immersed in the lubricating oil in the first oil storage chamber 6. It should be understood that the structure and arrangement of the gear set in the embodiment are not limited in particular, Figure 1 , the gear set shown in the figure is only used for exemplarily illustrating the technical scheme of the present application.

[0032] When the gear 8 rotates, the first oil pump 7 pumps the lubricating oil in the first oil storage cavity 6 into the second oil storage cavity 3 to reduce the liquid level of the lubricating oil in the first oil storage cavity 6. The first oil storage cavity 6 is arranged at the bottom of the box body 1, and in order to make the structure of the entire transmission box compact, part of the gears in the gear set can be partially immersed in the lubricating oil in the first oil storage cavity 6 to reduce the volume of the transmission box. When the transmission box is running, the gears immersed in the lubricating oil will stir the lubricating oil in the box body 1, and there is a stirring loss. By arranging the first oil pump 7 to pump the lubricating oil in the first oil storage cavity 6 into the second oil storage cavity 3, the liquid level of the lubricating oil in the first oil storage cavity 6 is reduced, and the oil immersion depth of the gears is reduced, and the stirring loss is reduced.

[0033] The lubricating oil in the second oil storage cavity 3 can be delivered to the positions in the box body 1 that need to be lubricated. The lubricating oil in the second oil storage cavity 3 can be delivered by being pumped by an oil pump, or when the second oil storage cavity 3 is arranged at a relatively high position of the box body 1, the lubricating oil in the second oil storage cavity 3 can be delivered to the positions in the box body 1 that need to be lubricated under the action of gravity. Compared with the gear splash lubrication method in the prior art, the parts in the box body 1 that need to be lubricated can be lubricated in a targeted manner, such as the drive motor shaft, the intermediate shaft, the input shaft, the generator gear shaft, and the differential that need to be lubricated. The drive motor shaft, the intermediate shaft, the input shaft, and the generator gear shaft are respectively provided with first gears 13, second gears 14, third gears 15, and fourth gears 16. The first gears 13, the second gears 14, the third gears 15, the fourth gears 16, and the gears 8 arranged on the differential form a gear set, so that the parts in the box body 1 are fully lubricated, and the cooling and lubrication efficiency is high. At the same time, there is no need to arrange more oil blocking structures in the box body 1, which reduces the design difficulty of the box body 1 and is beneficial to the arrangement of the parts in the box body 1, so that the overall structure is compact.

[0034] In the embodiment, the box 1 is further provided with a second oil pump 2, an oil inlet of the second oil pump 2 is communicated with the second oil storage cavity 3, an oil outlet of the second oil pump 2 is communicated with the main lubricating oil circuit 11, and the main lubricating oil circuit 11 is respectively directed to positions needing lubrication in the box 1 through a plurality of branch lubricating oil circuits 12. The second oil pump 2 can adopt an electronic oil pump, and the specific structure of the second oil pump 2 is the application of the prior art, which will not be described here. The oil inlet of the second oil pump 2 is communicated with the second oil storage cavity 3, so that the lubricating oil in the second oil storage cavity 3 can be respectively delivered to the positions needing lubrication in the box 1 through the plurality of branch lubricating oil circuits 12, the number of the branch lubricating oil circuits 12 can be set according to the use requirement, and the main lubricating oil circuit 11 and the branch lubricating oil circuit 12 can be formed on the side wall of the box 1 in the forming process or separately injection molded (that is, in the form of a plastic pipe) and assembled in the box 1 (which can be fixed by bolts, etc.), so as to form targeted lubrication for the parts needing lubrication in the box 1, thereby improving the lubrication effect and the cooling and lubrication efficiency.

[0035] In the embodiment, the oil inlet of the second oil pump 2 is further communicated with the first oil storage cavity 6, as shown in Figure 2 The oil inlet of the first oil pump 6 is communicated with the first oil storage cavity 6 through the communication oil circuit I 4, the oil outlet of the first oil pump 6 is communicated with the second oil storage cavity 3 through the communication oil circuit II 5, and the oil inlet of the second oil pump is communicated with the first oil storage cavity 6 through the communication oil circuit III 9. In the structure, the communication oil circuit I 4, the communication oil circuit II 5 and the communication oil circuit III 9 are independently arranged in the box 1 and formed by injection molding (that is, in the form of a plastic pipe) and installed in the box 1 (which can be fixed by bolts, etc.).

[0036] In the embodiment, the box 1 is further provided with an oil circuit selector 10, and the second oil pump 2 is selected to be communicated with the first oil storage cavity 6 or the second oil storage cavity 3 through the oil circuit selector 10. The oil circuit selector 10 is a structure similar to a three-way valve, and is communicated with the second oil pump 2, the first oil storage cavity 6 and the second oil storage cavity 3 by arranging the oil circuit selector 10. The oil circuit selector 10 is communicated with the first oil storage cavity 6 through the communication oil circuit III 9, so as to directly communicate the first oil storage cavity 6 and the second oil pump 2, and make the second oil pump 2 select to suck oil from the first oil storage cavity 6 or the second oil storage cavity 3 through the oil circuit selector 10. For example, when the liquid level in the first oil storage cavity 6 is high, the second oil pump 2 can directly suck oil from the first oil storage cavity 6 through the oil circuit selector 10, so as to accelerate the reduction of the liquid level in the first oil storage cavity 6 and reduce the oil stirring loss during the operation of the transmission box. When the liquid level in the first oil storage cavity 6 is in a low state, the second oil pump 2 selects to suck oil from the second oil storage cavity 3 through the oil circuit selector 10, and at the same time, when the gear set in the transmission box is not running, the second oil pump 2 can also deliver lubricating oil to the positions needing lubrication in the box 1.

[0037] In the embodiment, the oil path selector 10 comprises a body, a communication chamber 106 is arranged in the body, the communication chamber 106 is provided with a first oil inlet 102 and a second oil inlet 104, a first oil outlet 109 and a second oil outlet 108 are arranged corresponding to the first oil inlet 102 and the second oil inlet 104, the first oil inlet 102 and the second oil inlet 104 are communicated with the first oil storage chamber 6 and the second oil storage chamber 3 respectively, and the first oil outlet 109 and the second oil outlet 108 are communicated with the oil inlet of the second oil pump 2.

[0038] Specifically, in the structure, the first oil inlet 102 and the first oil outlet 109 are arranged corresponding and communicated with the communication chamber 106 respectively, and the second oil inlet 104 and the second oil outlet 108 are arranged corresponding and communicated with the communication chamber 106 respectively; the first oil inlet 102 is communicated with the first oil storage chamber 6 through a communication oil path III 9, so that the lubricating oil in the first oil storage chamber 6 can be introduced into the oil path selector 10, the second oil inlet 104 is communicated with the second oil storage chamber 3, so that the lubricating oil in the second oil storage chamber 3 can be introduced into the oil path selector 10, the first oil outlet 109 and the second oil outlet 108 are communicated with a communication oil path IV (not shown in the figure), and the communication oil path IV is communicated with the oil inlet of the second oil pump 2, so that the second oil pump 2 can be communicated with the first oil storage chamber 6 or the second oil storage chamber 3 by conducting the first oil outlet 109 and the first oil inlet 102 or conducting the second oil outlet 108 and the second oil inlet 104.

[0039] At least one end of the communication chamber 106 is provided with an electromagnet, a valve core 103 is movably arranged in the communication chamber 106 in the axial direction, the valve core 103 has magnetism, and the valve core 103 is provided with a connecting channel 1031 for communicating the first oil inlet 102 and the first oil outlet 109 or communicating the second oil inlet 104 and the second oil outlet 108.

[0040] Specifically, in the structure, preferably, electromagnets are arranged at both ends of the communication chamber 106, the valve core 103 is arranged in the communication chamber 106, the valve core 103 is provided with a magnetic material such as a magnet, and cooperates with the electromagnets at both ends of the communication chamber 106, so as to realize the left and right movement (relative to the left and right directions in the figure) of the valve core 103; when the electromagnet arranged on the left side (not shown in the figure) has current conduction (at this time, the electromagnet arranged on the right side has no current conduction), the valve core 103 moves to the left side, so that the connecting channel 1031 is communicated with the first oil inlet 102 and the first oil outlet 109, and when the electromagnet arranged on the right side has current conduction (at this time, the electromagnet arranged on the left side has no current conduction), the valve core 103 moves to the right side, so that the connecting channel 1031 is communicated with the second oil inlet 104 and the second oil outlet 108. Figure 4 ​

[0041] In the embodiment, the diameter of the middle section 1061 of the communication chamber 106 is larger than the diameter of the two ends of the communication chamber 106, and the diameter of the valve core is matched with the diameter of the middle section of the communication chamber. The diameter of the middle section 1061 of the communication chamber 106 is larger than the diameter of the two ends of the communication chamber 106, thereby forming a stepped structure at the connection between the two ends of the middle section 1061 and the communication chamber 106. The diameter of the valve core 103 is matched with the diameter of the middle section 1061, and the stepped structure can limit the left stroke of the valve core 103 or the right stroke of the valve core 103 when the valve core 103 moves left and right along the middle section 1061 of the communication chamber 106. When one end of the valve core 103 is at the stepped structure on the left, the valve core 103 is in communication with the first oil inlet 102 and the first oil outlet 109, and when one end of the valve core 103 is at the stepped structure on the right, the valve core 103 is in communication with the second oil inlet 104 and the second oil outlet 108, thereby ensuring the accuracy of the communication.

[0042] In the embodiment, a guide rod 107 axially parallel to the communication chamber 106 is arranged at one end of the valve core 103, and a mounting seat 105 is arranged in the communication chamber 106, and the guide rod 107 is slidably arranged in the mounting seat 105. The mounting seat 105 is provided with a through hole through which the guide rod 107 passes. When the valve core 103 moves left and right, it moves along the axial direction of the communication chamber 106 under the guidance of the guide rod 107 and the mounting seat 105, so that the valve core 103 is subjected to more force from the axial direction when moving, thereby reducing the force between the valve core 103 and the inner wall of the communication chamber 106, reducing the friction between the valve core 103 and the inner wall of the communication chamber 106, and prolonging the service life of the oil way selector 10.

[0043] In the embodiment, the outer peripheral wall of the valve core 103 and the inner wall of the communication chamber 106 are sealed by a sealing ring 101, and two sealing rings 101 are arranged on the left and right sides of the connecting channel 1031.

[0044] Specifically, a groove matched with the sealing ring 101 is arranged on the outer peripheral wall of the valve core 103, and the two sealing rings 101 are arranged on the left and right sides of the connecting channel 1031 (relative to the left and right sides of the connecting channel 1031). Figure 4 In this way, when the valve core 103 is in communication with the first oil inlet 102 and the first oil outlet 109 or the valve core 103 is in communication with the second oil inlet 104 and the second oil outlet 108, the leakage of lubricating oil into the communication chamber 106 is avoided.

[0045] In one possible implementation, a liquid level sensor 17 can be arranged in the second oil storage cavity 3, and the output of the liquid level sensor 17 is connected to the input of the control unit. The control unit controls the conduction current of the electromagnet according to the liquid level information of the liquid level sensor 17.

[0046] Specifically, the control unit includes a CPU and peripheral circuits, and the liquid level sensor 17 is used to obtain the liquid level information in the second oil storage cavity 3. For example, when the liquid level in the second oil storage cavity 3 reaches 85% of the total liquid level in the second oil storage cavity 3, the control unit controls the corresponding electromagnet to be turned on, and the valve core 103 moves to the right (relative to the left-right direction in Figure 4 ), so as to realize the communication between the second oil outlet 108 and the second oil inlet 104, and the second oil pump 2 selects to absorb lubricating oil from the second oil storage cavity 3. When the liquid level in the second oil storage cavity 3 is less than 85% of the total liquid level in the second oil storage cavity 3, the control unit controls the corresponding electromagnet to be turned on, and the valve core 103 moves to the left, so as to realize the communication between the first oil outlet 109 and the first oil inlet 102, and the second oil pump 2 selects to absorb lubricating oil from the first oil storage cavity 6.

[0047] In this embodiment, the second oil storage cavity 3 is arranged above the first oil storage cavity 6. The second oil storage cavity 3 is arranged at a position close to the top of the bottom of the box 1 relative to the first oil storage cavity 6, which can be arranged at the middle of the box 1, or a position close to the bottom of the middle (relative to the up-down direction in Figure 1 ).

[0048] In this embodiment, the volume ratio of the first oil storage cavity 6 to the second oil storage cavity 3 is 1:0.9-0.98, and the volume of the first oil storage cavity 6 is slightly larger than that of the second oil storage cavity 3. When the transmission box is running, most of the lubricating oil in the first oil storage cavity 6 can be pumped to the second oil storage cavity 3, so that the oil stirring loss can be minimized. When the oil stirring loss in the transmission box is the lowest, the second oil storage cavity 3 is filled with lubricating oil, and the liquid level of the lubricating oil in the first oil storage cavity 6 is located at the lowest point of the gear 8.

[0049] In this embodiment, the first oil pump 7 is drivingly connected with the gear 8 which is partially immersed in the lubricating oil in the first oil storage cavity 6. In this structure, the gear 8 is preferably arranged on the differential, and the first oil pump 7 can be a mechanical oil pump. The structure of the mechanical oil pump is the application of the prior art, and will not be described here. The first oil pump 7 is provided with a driven gear drivingly connected with the gear 8, so that when the gear 8 works, the first oil pump 7 can be driven to work, and the lubricating oil in the first oil storage cavity 6 is pumped to the second oil storage cavity 3. Therefore, a separate driving mechanism for the first oil pump 7 is not needed, so that the structure is compact.

[0050] The utility model discloses a transmission case, lubricating oil is stored in the first oil storage cavity 6, gear 8 preferably sets up on the differential, of course, gear 8 can also not set up on the differential, the cooling lubrication structure of the utility model can also set up on the transmission case without differential, the first gear 13 of setting up on the driving motor shaft transmits power to the second gear 14 of setting up on the intermediate shaft, the second gear 14 of setting up on the intermediate shaft transmits power to the gear 8 of setting up on the differential, and the driving motor shaft is as power source, when the driving motor shaft does not rotate, gear 8 does not rotate, and thereby the first oil pump 7 does not work, at this moment, the second oil pump 2 selects and communicates with the first oil storage cavity 6 through the oil way selector 10, and delivers lubricating oil to the position needing lubrication in the box 1, at this moment, there is no oil stirring loss.

[0051] When the gear 8 in transmission case operates, the first oil pump 7 starts working, and the lubricating oil in the first oil storage cavity 6 is pumped to the second oil storage cavity 3, so that the lubricating oil liquid level in the first oil storage cavity 6 drops, reduces the oil stirring loss, and when the liquid level in the second oil storage cavity 3 reaches the trigger value, the second oil pump 2 selects the lubricating oil from the first oil storage cavity 6 through the oil way selector 10, further speeds up the lubricating oil liquid level in the first oil storage cavity 6 to reduce, thereby accelerating the reduction of oil stirring loss.

[0052] When the liquid level in the second oil storage cavity 3 reaches the trigger value, the second oil pump 2 selects the lubricating oil from the second oil storage cavity 3 through the oil way selector 10, and delivers the lubricating oil to the position needing lubrication in the box 1.

[0053] Finally, it is explained that the above embodiment is only used to illustrate the technical scheme of the utility model and is not limited, although the utility model is described in detail with reference to the preferred embodiment, those skilled in the art should understand that the technical scheme of the utility model can be modified or equivalent replaced, and does not deviate from the purpose and scope of the technical scheme of the utility model, which should be covered in the claim range of the utility model.

Claims

1. A transmission box, comprising a box body and a gear set disposed within the box body, characterized in that: The housing is also equipped with a first oil pump and a first oil storage chamber and a second oil storage chamber that are independent of each other. The first oil storage chamber is located at the bottom of the housing. At least one gear in the gear set is partially immersed in the lubricating oil in the first oil storage chamber. When the gear rotates, the first oil pump pumps the lubricating oil in the first oil storage chamber to the second oil storage chamber. The lubricating oil in the second oil storage chamber can be delivered to the parts of the box that need lubrication.

2. The transmission box according to claim 1, characterized in that: The housing is also equipped with a second oil pump. The oil inlet of the second oil pump is connected to the second oil storage chamber, and the oil outlet of the second oil pump is connected to the main lubrication oil circuit. The main lubrication oil circuit is connected to the location in the housing that needs lubrication through several branch lubrication oil circuits.

3. The transmission box according to claim 2, characterized in that: The oil inlet of the second oil pump is also connected to the first oil storage chamber.

4. The transmission box according to claim 3, characterized in that: The housing is also equipped with an oil circuit selector, through which the second oil pump can select to connect to either the first oil storage chamber or the second oil storage chamber.

5. The transmission box according to claim 4, characterized in that: The oil circuit selector includes a body, which has a communicating chamber. The communicating chamber has a first oil inlet and a second oil inlet, and a first oil outlet and a second oil outlet are provided corresponding to the first oil inlet and the second oil inlet. The first oil inlet and the second oil inlet are respectively connected to the first oil storage chamber and the second oil storage chamber, and the first oil outlet and the second oil outlet are both connected to the oil inlet of the second oil pump. An electromagnet is provided at at least one end of the communicating chamber, and a valve core is movably provided axially within the communicating chamber. The valve core is magnetic, and a connecting channel is provided within the valve core for connecting the first oil inlet and the first oil outlet or for connecting the second oil inlet and the second oil outlet.

6. The transmission box according to claim 5, characterized in that: The diameter of the middle section of the connecting chamber is larger than the diameter of both ends of the connecting chamber, and the diameter of the valve core is adapted to the diameter of the middle section of the connecting chamber.

7. The transmission box according to claim 5, characterized in that: The valve core is also provided with a guide rod at one end that is parallel to the axis of the communicating chamber. A mounting seat is provided in the communicating chamber, and the guide rod slides through the mounting seat.

8. The transmission box according to claim 5, characterized in that: The outer peripheral wall of the valve core is sealed to the inner wall of the communicating chamber by a sealing ring. Two sealing rings are provided, and the two sealing rings are respectively located on both sides of the connecting channel.

9. The transmission box according to claim 1, characterized in that: The second oil storage chamber is located above the first oil storage chamber.

10. The transmission box according to claim 1, characterized in that: The first oil pump is connected to the gear transmission in the lubricating oil partially immersed in the first oil reservoir.

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