Rotor pump, gearbox and working vehicle

Abstract

The utility model relates to the technical field of operation machinery, and discloses a rotor pump, a gearbox and an operation vehicle, an oil outlet hole and an oil inlet hole are formed in an oil pumping cavity, an outer ring and an inner ring of an eccentric ring are eccentric, the outer ring of the eccentric ring is rotatably arranged in the oil pumping cavity, and an outer rotor is rotatably arranged on the inner ring of the eccentric ring. The pump shaft is connected with the inner rotor, the inner rotor is arranged in the outer rotor in a matched mode, and the inner rotor and the eccentric ring are coaxially arranged. The limiting structure is arranged in the oil pumping cavity and suitable for limiting the eccentric ring to rotate between the first position and the second position, and when the eccentric ring is in the first position and the second position, the axis of the outer rotor is eccentric in the first direction and the second direction deviating from the first direction relative to the axis of the inner rotor. No matter whether the pump shaft drives the inner rotor to rotate forwards or backwards, oil liquid at the oil inlet hole can be pushed to the oil outlet hole to be discharged. An electronic oil pump can be replaced to supply oil to a lubricating oil channel of the reduction gearbox, and high cost and high failure rate during long-time operation of the electronic oil pump are avoided.

Description

Technical Field

[0001] The present application relates to the technical field of construction machinery, and particularly relates to a rotor pump, a gearbox and a construction vehicle. Background Art

[0002] A construction vehicle refers to a vehicle equipped with special equipment or appliances for carrying out various special operations. The driving force for its movement is transmitted from the gearbox to the output shaft. For the bearings in the gearbox, a rotor pump is often arranged on the gearbox to provide lubricating oil for the bearings in the gearbox. The oil inlet hole of the rotor pump is connected to the lubricating oil, and the oil outlet hole is connected to the lubricating oil passage of the gearbox. Since the rotor pump can only rotate in one direction for oil supply, a toothed shaft that rotates in a fixed direction in the gearbox often penetrates through the gearbox and drives the rotor pump to rotate, so that the rotor pump continuously provides lubricating oil for the bearings in the gearbox.

[0003] However, for an electric construction vehicle, its power unit is a motor and the transmission does not have a reverse gear, and the forward and backward movement of the whole vehicle is realized by the forward and reverse rotation of the motor. This causes all the toothed shafts in the transmission to change the rotation direction as the motor switches the rotation direction, and there is no toothed shaft that rotates in a fixed direction. If a rotor pump is still used to connect to a toothed shaft in the transmission, it will result in the rotor pump normally pumping in lubricating oil when the vehicle moves forward; the rotor pump cannot pump in lubricating oil when the vehicle moves backward, or the rotor pump normally pumps in lubricating oil when the vehicle moves forward; the rotor pump cannot pump in lubricating oil when the vehicle moves backward. The inability to continuously supply oil may cause poor lubrication of the transmission and damage.

[0004] In view of the above situation, existing electric construction vehicles often use an electronic oil pump to provide lubrication. The electronic oil pump has high-precision electronic control components and an oil supply system. Although it can continuously supply oil to the transmission of the electric construction vehicle, the cost is high, and the failure rate is high during long-term operation. Summary of the Utility Model

[0005] In view of this, the present application provides a rotor pump, a gearbox and a construction vehicle to solve the problem that the transmission of existing electric construction vehicles uses an electronic oil pump for lubrication, resulting in high cost and high failure rate during long-term operation.

[0006] In a first aspect, the present application provides a rotor pump, including: an oil pumping chamber, an eccentric ring, an outer rotor, an inner rotor, a pump shaft and a limiting structure, wherein,

[0007] An oil outlet hole and an oil inlet hole are arranged in the oil pumping chamber;

[0008] The outer ring and the inner ring of the eccentric ring are eccentrically arranged, the outer ring of the eccentric ring is rotatably arranged in the oil pumping chamber, and the outer rotor is rotatably arranged inside the inner ring of the eccentric ring;

[0009] The pump shaft is connected to the inner rotor, the inner rotor is disposed in the outer rotor in a mating manner, and the axis of the inner rotor is coaxially arranged with the outer ring axis of the eccentric ring;

[0010] The limiting structure is disposed in the pump oil chamber and is adapted to limit the rotation of the eccentric ring between a first position and a second position. When the eccentric ring is in the first position, the axis of the outer rotor is eccentric with respect to the axis of the inner rotor in a first direction. When the eccentric ring is in the second position, the axis of the outer rotor is eccentric with respect to the axis of the inner rotor in a second direction opposite to the first direction.

[0011] Optionally, the limiting structure includes a limiting post. The limiting post is disposed in the pump oil chamber, and a sliding groove is provided on the eccentric ring. The limiting post is inserted into the sliding groove. Among them,

[0012] When the eccentric ring is in the first position, the first end of the sliding groove abuts against the limiting post; when the eccentric ring is in the second position, the second end of the sliding groove abuts against the limiting post.

[0013] Optionally, the outer rotor and the inner ring of the eccentric ring are in clearance fit.

[0014] Optionally, it further includes a housing and a cover plate. A ring-shaped protrusion is provided on the housing, and the cover plate covers the ring-shaped protrusion to form the pump oil chamber. The outer ring of the eccentric ring is rotatably disposed inside the ring-shaped protrusion, and the limiting structure is disposed inside the ring-shaped protrusion.

[0015] Optionally, an oil inlet groove and an oil outlet groove are respectively formed on the housing. The oil inlet groove and the oil outlet groove are respectively located on both sides of the ring-shaped protrusion and are respectively communicated with the oil inlet hole and the oil outlet hole.

[0016] Optionally, the oil inlet hole and the oil outlet hole are formed on the housing and are both located inside the ring-shaped protrusion. A first channel and a second channel are respectively formed on the housing. The first end of the first channel is communicated with the oil inlet hole, and the second end of the first channel is communicated with the oil inlet groove; the first end of the second channel is communicated with the oil outlet hole, and the second end of the second channel is communicated with the oil outlet groove.

[0017] Optionally, it further includes: a sealing ring. An installation groove is provided on the cover plate, and the sealing ring is installed in the installation groove. When the cover plate covers the ring-shaped protrusion, the sealing ring abuts against the ring-shaped protrusion.

[0018] In the second aspect, the present application also provides a gearbox, comprising a transmission shaft, a lubricating oil channel and an oil supply device, wherein the oil supply device is configured as any of the above-described rotor pumps, the transmission shaft is connected to the pump shaft of the rotor pump to drive the pump shaft of the rotor pump to rotate, and the oil outlet hole of the rotor pump is connected to the lubricating oil channel.

[0019] Optionally, it further includes: an oil tank, and the oil inlet hole of the rotor pump is connected to the oil tank.

[0020] In a third aspect, the present application also provides a work vehicle, comprising any of the gearboxes described above.

[0021] The present application provides a rotor pump, comprising: a pump oil chamber, an eccentric ring, an outer rotor, an inner rotor, a pump shaft and a limiting structure. An oil outlet and an oil inlet are provided in the pump oil chamber, and the outer ring of the eccentric ring is eccentrically arranged with respect to the inner ring. The eccentric ring is arranged in the pump oil chamber so that the eccentric ring can rotate in the pump oil chamber. The outer rotor is rotatably arranged on the inner ring of the eccentric ring. The pump shaft is connected to the inner rotor, and the inner rotor is cooperatively arranged in the outer rotor, and the axis of the inner rotor is coaxially arranged with the axis of the outer ring of the eccentric ring. The limiting structure is arranged in the pump oil chamber and is suitable for limiting the rotation of the eccentric ring between a first position and a second position. When the inner rotor rotates forward, it drives the outer rotor to rotate and drives the eccentric ring to rotate to the first position. At this time, the axis of the outer rotor is eccentric to the first direction relative to the axis of the inner rotor, and the oil can be pushed from the oil inlet to the oil outlet when the inner rotor rotates forward. When the inner rotor reverses, it drives the outer rotor to rotate and drives the eccentric ring to rotate to the second position. At this time, the axis of the outer rotor is eccentric to the second direction away from the first direction relative to the axis of the inner rotor. When the inner rotor reverses, the oil can be pushed from the oil inlet to the oil outlet. In this way, the pump shaft is connected to a transmission shaft in the reduction box, and the oil outlet is connected to the lubricating oil channel of the reduction box to supply oil to the oil inlet. Regardless of whether the transmission shaft rotates forward or reverse, when the pump shaft drives the inner rotor to rotate, the oil at the oil inlet can be pushed to the oil outlet to be discharged and supply oil to the lubricating oil channel of the reduction box. It can replace the electronic oil pump to supply oil to the lubricating oil channel of the reduction box, avoiding the problem of high cost of using electronic oil pumps and high failure rate during long-term operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the specific implementation methods of the present application 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 present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 This is a schematic structural diagram of a rotor pump according to an embodiment of the present application when the eccentric ring is located in a first position;

[0024] Figure 2 Schematic structural diagram of an eccentric ring of a rotor pump according to an embodiment of the present application in the first position;

[0025] Figure 3 Schematic structural diagram of an eccentric ring of a rotor pump according to an embodiment of the present application when in the second position;

[0026] Figure 4 Schematic structural diagram of an eccentric ring of a rotor pump according to an embodiment of the present application in the second position;

[0027] Figure 5 Schematic installation diagram of a cover plate of a rotor pump according to an embodiment of the present application;

[0028] Figure 6 Cross-sectional schematic diagram of a rotor pump according to an embodiment of the present application;

[0029] Figure 7 Schematic structural diagram of a gearbox according to an embodiment of the present application.

[0030] Description of reference numerals:

[0031] 1, pump oil chamber; 2, eccentric ring; 3, outer rotor; 4, inner rotor; 5, chute; 6, oil inlet hole; 7, oil outlet hole; 8, first channel; 9, second channel; 10, pump shaft; 11, transmission shaft; 12, cover plate; 13, bushing; 14, sealing ring; 15, limit post; 16, housing; 17, oil inlet groove; 18, oil outlet groove; 19, annular protrusion. Detailed implementation manners

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Apparently, the described embodiments are some, but not all, of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0033] The following will be combined with Figures 1 to 7 , to describe the embodiments of the present application.

[0034] According to an embodiment of the present application, on the one hand, a rotor pump is provided, as shown in Figure 1 and Figure 3As shown in the figure, it includes: an oil pumping chamber 1, an eccentric ring 2, an outer rotor 3, an inner rotor 4, a pump shaft 10 and a limiting structure. The oil pumping chamber 1 is a cylindrical cavity, and an oil outlet hole 7 and an oil inlet hole 6 are arranged in the oil pumping chamber 1. The oil outlet hole 7 and the oil inlet hole 6 are respectively located on two opposite sides inside the oil pumping chamber 1. The eccentric ring 2 has an outer ring and an inner ring, both of which are circular, and the outer ring and the inner ring of the eccentric ring 2 are eccentrically arranged. The eccentric ring 2 is arranged in the oil pumping chamber 1 so that the eccentric ring 2 can rotate in the oil pumping chamber 1. Among them, the outer ring of the eccentric ring 2 can be in clearance fit with the cavity wall of the oil pumping chamber 1. Thus, the eccentric ring 2 can rotate around its axis relative to the cavity wall of the oil pumping chamber 1.

[0035] The outer rotor 3 is circular and is arranged inside the inner ring of the eccentric ring 2, so that the outer rotor 3 can rotate around its axis relative to the inner ring of the eccentric ring 2. Moreover, since the eccentric ring 2 can rotate around its axis relative to the cavity wall of the oil pumping chamber 1, when the outer rotor 3 rotates, it can drive the eccentric ring 2 to rotate.

[0036] As Figure 2 and Figure 4 As shown in the figure, the limiting structure is arranged inside the oil pumping chamber 1 and plays a limiting role in the rotation of the eccentric ring 2. Under the limiting action of the limiting structure, when the eccentric ring 2 rotates in the oil pumping chamber 1, it can only rotate between the first position and the second position.

[0037] The outer rotor 3 is internally provided with annular tooth grooves, and the outer side of the inner rotor 4 is annularly provided with teeth. The inner rotor 4 is arranged in the tooth grooves of the outer rotor 3 in a matching manner, so that the teeth of the inner rotor 4 are engaged with the tooth grooves, and the inner rotor 4 and the outer rotor 3 are eccentrically arranged. Since the cooperation between the outer rotor 3 and the inner rotor 4 of the rotor pump is a conventional technology, it will not be elaborated here. The inner rotor 4 is coaxially connected to the pump shaft 10, so that the pump shaft 10 can drive the inner rotor 4 to rotate.

[0038] As Figure 2 and Figure 4 As shown in the figure, when the pump shaft 10 drives the inner rotor 4 to rotate forward, it drives the outer rotor 3 to rotate forward and drives the eccentric ring 2 to rotate forward. Under the limiting action of the limiting structure, the eccentric ring 2 stops rotating after rotating to the first position. At this time, the axis of the outer rotor 3 is eccentric to the first direction relative to the axis of the inner rotor 4. In the first direction relative to the axis of the inner rotor 4, the teeth are separated from the tooth grooves; in the second direction relative to the axis of the inner rotor 4, the teeth are engaged with the tooth grooves. The first direction and the second direction are opposite directions.

[0039] In this way, as the pump shaft 10 drives the inner rotor 4 to rotate forward, the outer rotor 3 is driven to rotate eccentrically relative to the axis of the inner rotor 4, that is, the rotational speed of the outer rotor 3 is less than that of the inner rotor 4. The first tooth engaging with the first tooth groove gradually leaves the first tooth groove and rotates towards the oil inlet hole 6. A cavity is gradually formed between the first tooth, the second tooth adjacent to the first tooth, and the second tooth groove adjacent to the first tooth groove. At this time, the cavity is communicated with the oil inlet hole 6 and the oil can enter the cavity. As the first tooth continues to rotate, the cavity gradually increases and the oil continuously enters the cavity from the oil inlet hole 6. Until the first tooth leaves the first tooth groove and begins to enter the second tooth groove, the cavity is no longer communicated with the oil inlet hole 6 and begins to be communicated with the oil outlet hole 7. As the first tooth continues to rotate, the first tooth gradually engages with the second tooth groove and the volume of the cavity gradually decreases, thereby gradually pressing the oil in the cavity to the oil outlet hole 7 for discharge. In this way, when the inner rotor 4 rotates forward, each tooth can push the oil at the oil inlet hole 6 to the oil outlet hole 7 for discharge.

[0040] When the pump shaft 10 drives the inner rotor 4 to rotate reversely, it drives the outer rotor 3 to rotate reversely and drives the eccentric ring 2 to rotate reversely. Under the limiting action of the limiting structure, the eccentric ring 2 stops rotating after rotating to the second position. At this time, the axis of the outer rotor 3 is eccentric in the second direction relative to the axis of the inner rotor 4. In the second direction relative to the axis of the inner rotor 4, the teeth are separated from the tooth grooves; in the first direction relative to the axis of the inner rotor 4, the teeth are engaged with the tooth grooves. The first direction and the second direction are opposite directions.

[0041] In this way, as the pump shaft 10 drives the inner rotor 4 to rotate reversely, the outer rotor 3 is driven to rotate eccentrically relative to the axis of the inner rotor 4, that is, the rotational speed of the outer rotor 3 is less than that of the inner rotor 4. The first tooth engaging with the first tooth groove gradually leaves the first tooth groove and rotates towards the oil inlet hole 6. A cavity is gradually formed between the first tooth, the second tooth adjacent to the first tooth, and the second tooth groove adjacent to the first tooth groove. At this time, the cavity is communicated with the oil inlet hole 6 and the oil can enter the cavity. As the first tooth continues to rotate, the cavity gradually increases and the oil continuously enters the cavity from the oil inlet hole 6. Until the first tooth leaves the first tooth groove and begins to enter the second tooth groove, the cavity is no longer communicated with the oil inlet hole 6 and begins to be communicated with the oil outlet hole 7. As the first tooth continues to rotate, the first tooth gradually engages with the second tooth groove and the volume of the cavity gradually decreases, thereby gradually pressing the oil in the cavity to the oil outlet hole 7 for discharge. In this way, when the inner rotor 4 rotates reversely, each tooth can push the oil at the oil inlet hole 6 to the oil outlet hole 7 for discharge.

[0042] In this way, the pump shaft 10 is connected to a transmission shaft 11 inside the reduction gearbox, the oil outlet hole 7 is communicated with the lubricating oil passage of the reduction gearbox, and oil is supplied to the oil inlet hole 6. Whether the transmission shaft 11 rotates forward or backward, when driving the inner rotor 4 to rotate through the pump shaft 10, the oil at the oil inlet hole 6 can be pushed to the oil outlet hole 7 for discharge to supply oil to the lubricating oil passage of the reduction gearbox. It can replace the electronic oil pump to supply oil to the lubricating oil passage of the reduction gearbox, avoiding the problems of high cost of using the electronic oil pump and high failure rate during long-term operation.

[0043] As an optional implementation manner, as Figures 1 to 4 shown, the limiting structure includes a limiting column 15, and the limiting column 15 is fixedly arranged in the oil pumping chamber 1. A sliding groove 5 is arranged on the eccentric ring 2, and the axis of the sliding groove 5 is the same as the axis of the outer circle of the eccentric ring 2. The limiting column 15 is cylindrical, and its axis is parallel to the axis of the eccentric ring 2. The limiting column 15 is inserted into the sliding groove 5, and when the eccentric ring 2 rotates, the limiting column 15 slides along the sliding groove 5 relative to the eccentric ring 2. When the eccentric ring 2 rotates, when the eccentric ring 2 rotates to the first position, the end wall of the first end of the sliding groove 5 abuts against the limiting column 15, so that the limiting column 15 blocks the eccentric ring 2 and the eccentric ring 2 cannot continue to rotate. When the eccentric ring 2 rotates from the first position to the second position and rotates to the second position, the end wall of the second end of the sliding groove 5 abuts against the limiting column 15, so that the limiting column 15 blocks the eccentric ring 2 and the eccentric ring 2 cannot continue to rotate. In this way, under the limiting action of the limiting column 15, the eccentric ring 2 can only move between the first position and the second position.

[0044] The sliding groove 5 is semi-circular, so that the eccentric ring 2 rotates exactly 180° when moving from the first position to the second position. When the eccentric ring 2 is in the first position, the axis of the outer rotor 3 is eccentric with respect to the axis of the inner rotor 4 in the first direction, and the connection line between the axis of the outer rotor 3 and the axis of the inner rotor 4 is perpendicular to the connection line between the first end and the second end of the sliding groove 5. Thus, when the eccentric ring 2 rotates from the first position to the second position, the eccentric ring 2 rotates 180°, and the connection line between the axis of the outer rotor 3 and the axis of the inner rotor 4 is still perpendicular to the connection line between the first end and the second end of the sliding groove 5, but the axis of the outer rotor 3 is eccentric with respect to the axis of the inner rotor 4 in the second direction. That is, the effect of the inner rotor 4 rotating forward when the eccentric ring 2 is in the first position and the inner rotor 4 rotating backward when the eccentric ring 2 is in the second position is the same. That is, whether the inner rotor 4 rotates forward or backward, the oil at the oil inlet hole 6 can be pushed to the oil outlet hole 7.

[0045] In an optional embodiment, the outer rotor 3 is in clearance fit with the inner ring of the eccentric ring 2, so that the outer rotor 3 can not only rotate inside the inner ring of the eccentric ring 2, but also drive the eccentric ring 2 to rotate when rotating. In this way, when the eccentric ring 2 rotates to the first position or the second position, under the limiting action of the limiting structure, the eccentric ring 2 cannot continue to rotate, but the outer rotor 3 can still rotate inside the inner ring of the eccentric ring 2.

[0046] In some embodiments, such as Figure 5 and Figure 6 shown, the rotor pump further includes a housing 16 and a cover plate 12. A ring-shaped protrusion 19 is fixedly provided on the housing 16. The inner ring of the ring-shaped protrusion 19 is circular, and the ring-shaped protrusion 19 can be integrally formed with the housing 16. Thus, an oil pumping chamber 1 is formed inside the inner ring of the ring-shaped protrusion 19. The outer ring of the eccentric ring 2 is rotatably arranged inside the ring-shaped protrusion 19, and a limiting structure is arranged inside the ring-shaped protrusion 19. After the cover plate 12 is covered on the ring-shaped protrusion 19, a closed oil pumping chamber 1 is formed between the cover plate 12, the ring-shaped protrusion 19 and the housing 16. The cover plate 12 can be fixed on the ring-shaped protrusion 19 by fastening screws.

[0047] A rotating hole should be provided on the housing 16 and a bushing 13 should be arranged in the rotating hole. The pump shaft 10 is rotatably connected in the bushing 13.

[0048] In a further embodiment, such as Figure 1 , Figure 3 and Figure 6 shown, an oil inlet groove 17 is formed on the housing 16, such that the oil inlet groove 17 is located on the first side of the ring-shaped protrusion 19 and communicates with the oil inlet hole 6. An oil outlet groove 18 is formed on the housing 16, such that the oil outlet groove 18 is located on the second side of the ring-shaped protrusion 19 and communicates with the oil inlet hole 6.

[0049] With such an arrangement, after the housing 16 is installed on the outer wall of the transmission, the oil inlet groove 17 forms an oil inlet passage, and the oil can enter the oil inlet hole 6 through the oil inlet groove 17; the oil outlet groove 18 forms an oil outlet passage, and the oil outlet passage just communicates with the lubricating oil passage of the transmission, and the oil can be discharged from the oil outlet hole 7 through the oil outlet groove 18 into the lubricating oil passage of the transmission.

[0050] Furthermore, such as Figure 1 and Figure 3 shown, the oil inlet hole 6 is formed on the housing 16 and is located inside the ring-shaped protrusion 19, and the oil outlet hole 7 is formed on the housing 16 and is located inside the ring-shaped protrusion 19. A first passage 8 is formed on the housing 16, such that the first end of the first passage 8 communicates with the oil inlet hole 6 and the second end of the first passage 8 communicates with the oil inlet groove 17. A second passage 9 is formed on the housing 16, such that the first end of the second passage 9 communicates with the oil outlet hole 7 and the second end of the second passage 9 communicates with the oil outlet groove 18. In this way, the oil entering the oil inlet groove 17 can enter the oil inlet hole 6 through the first passage 8, and the oil in the oil outlet hole 7 can enter the oil outlet groove 18 through the second passage 9 and then be discharged.

[0051] In an alternative embodiment, such as Figure 6As shown, the rotor pump further includes: a sealing ring 14. An annular mounting groove is provided on the cover plate 12, and the sealing ring 14 is arranged in the mounting groove. With this arrangement, when the cover plate 12 covers the annular protrusion 19, the sealing ring 14 abuts against the annular protrusion 19. Thus, the sealing ring 14 plays a sealing role between the cover plate 12 and the annular protrusion 19, preventing the oil from leaking between the sealing ring 14 and the annular protrusion 19.

[0052] It should be noted that the forward direction is Figures 1 to 4 the clockwise direction of the perspective shown in [the figure], and the reverse direction is the counterclockwise direction.

[0053] According to an embodiment of the present application, on the other hand, a transmission is further provided, as Figure 7 shown, including a transmission shaft 11, a lubricating oil passage, and an oil supply device. The oil supply device is the rotor pump described above. The transmission shaft 11 is connected to the pump shaft 10 of the rotor pump. The oil outlet groove 18 of the rotor pump is communicated with the lubricating oil passage, so that the oil outlet hole 7 of the rotor pump is communicated with the lubricating oil passage. When the transmission works, its transmission shaft 11 rotates forward or backward, driving the pump shaft 10 to rotate forward or backward, and further driving the inner rotor 4 to rotate forward or backward. Whether the rotor rotates forward or backward, the oil can always be continuously pumped from the oil inlet hole 6 to the oil outlet hole 7, thus continuously supplying oil to the lubricating oil passage. Using this rotor pump can replace the electronic oil pump to supply oil to the lubricating oil passage of the reduction gearbox, avoiding the problems of high cost of using the electronic oil pump and high failure rate during long-term operation.

[0054] In an alternative embodiment, the transmission further includes a fuel tank, which can be arranged inside the transmission, and the oil inlet groove 17 of the rotor pump is communicated with the fuel tank. The oil in the fuel tank can enter the oil inlet groove 17 of the rotor pump. With this arrangement, there is no need to set up an additional fuel tank, reducing the occupied space.

[0055] According to an embodiment of the present application, on yet another aspect, a working vehicle is further provided, including any of the above transmissions. The effects brought by this working vehicle are the same as those of the transmission, so they will not be elaborated here.

[0056] Although the embodiments of the present application have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present application, and such modifications and variations all fall within the scope defined by the present application.

Claims

1. A rotor pump, characterized in that: include: A pump oil chamber (1), an eccentric ring (2), an outer rotor (3), an inner rotor (4), a pump shaft (10) and a limiting structure, wherein: The pump oil chamber (1) is provided with an oil outlet hole (7) and an oil inlet hole (6); The outer ring of the eccentric ring (2) is eccentrically arranged with respect to the inner ring, the outer ring of the eccentric ring (2) is rotatably arranged in the pump oil chamber (1), and the outer rotor (3) is rotatably arranged on the inner side of the inner ring of the eccentric ring (2); The pump shaft (10) is connected to the inner rotor (4), and the inner rotor (4) is arranged in cooperation with the outer rotor (3) and can push oil from the oil inlet hole (6) to the oil outlet hole (7) when rotating. The axis of the inner rotor (4) is coaxially arranged with the axis of the outer ring of the eccentric ring (2); The limiting structure is arranged in the pump oil chamber (1) and is suitable for limiting the rotation of the eccentric ring (2) between a first position and a second position. When the eccentric ring (2) is in the first position, the axis of the outer rotor (3) is eccentric to a first direction relative to the axis of the inner rotor (4). When the eccentric ring (2) is in the second position, the axis of the outer rotor (3) is eccentric to a second direction away from the first direction relative to the axis of the inner rotor (4).

2. The rotor pump according to claim 1, characterized in that: The limiting structure comprises a limiting column (15), wherein the limiting column (15) is arranged in the pump oil chamber (1), and a slide groove (5) is arranged on the eccentric ring (2), wherein the limiting column (15) is inserted in the slide groove (5), wherein: When the eccentric ring (2) is in the first position, the first end of the slide groove (5) abuts against the limit column (15); when the eccentric ring (2) is in the second position, the second end of the slide groove (5) abuts against the limit column (15).

3. The rotor pump according to claim 1, characterized in that: The outer rotor (3) is clearance-matched with the inner ring of the eccentric ring (2).

4. The rotor pump according to claim 1, characterized in that: The invention also comprises a shell (16) and a cover plate (12), wherein an annular protrusion (19) is arranged on the shell (16), and the cover plate (12) seals the annular protrusion (19) to form the pump oil chamber (1), the outer ring of the eccentric ring (2) is rotatably arranged on the inner side of the annular protrusion (19), and the limiting structure is arranged on the inner side of the annular protrusion (19).

5. The rotor pump according to claim 4, characterized in that: The housing (16) is provided with an oil inlet groove (17) and an oil outlet groove (18), respectively. The oil inlet groove (17) and the oil outlet groove (18) are respectively located on two sides of the annular protrusion (19) and are respectively connected to the oil inlet hole (6) and the oil outlet hole (7).

6. The rotor pump according to claim 5, characterized in that: The oil inlet hole (6) and the oil outlet hole (7) are provided on the housing (16) and are both located inside the annular protrusion (19). The housing (16) is provided with a first channel (8) and a second channel (9), respectively. The first end of the first channel (8) is communicated with the oil inlet hole (6), and the second end of the first channel (8) is communicated with the oil inlet groove (17); the first end of the second channel (9) is communicated with the oil outlet hole (7), and the second end of the second channel (9) is communicated with the oil outlet groove (18).

7. The rotor pump according to claim 4, characterized in that: Also includes: A sealing ring (14), wherein a mounting groove is provided on the cover plate (12), and the sealing ring (14) is mounted in the mounting groove. When the cover plate (12) is sealed on the annular protrusion (19), the sealing ring (14) is tightly pressed against the annular protrusion (19).

8. A gearbox, characterized in that: It comprises a transmission shaft (11), a lubricating oil passage and an oil supply device, wherein the oil supply device is configured as a rotor pump according to any one of claims 1 to 7, the transmission shaft (11) is connected to the pump shaft (10) of the rotor pump to drive the pump shaft (10) of the rotor pump to rotate, and the oil outlet hole (7) of the rotor pump is connected to the lubricating oil passage.

9. The gearbox according to claim 8, characterized in that: Also includes: An oil tank, wherein the oil inlet hole (6) of the rotor pump is connected to the oil tank.

10. A working vehicle, characterized in that: A gearbox comprising the gearbox described in any one of claims 8-9.

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