Internal integrated mechanical pump and gearbox

Abstract

The utility model relates to an internal integrated mechanical pump and a gear box. The mechanical pump is used for conveying oil of the gear box. The conveying device comprises a shell and a conveying piece. The shell is arranged in the gearbox, at least part of the shell and the gearbox are integrally formed, and a containing cavity, an oil inlet channel and an oil outlet channel are formed in the shell; the accommodating cavity is used for mounting a conveying piece; one end of the oil inlet channel communicates with the oil inlet, and the other end communicates with the accommodating cavity; one end of the oil outlet channel communicates with the oil outlet, and the other end communicates with the accommodating cavity; the conveying piece is rotationally connected with the shell, is in meshing transmission with a gear set of the gear box and is used for conveying the oil liquid of the gear box from the oil inlet channel to the oil outlet channel through the containing cavity. According to the mechanical pump, the shell and the gear box are partially and integrally formed, a connecting structure does not need to be additionally arranged to connect the shell and the gear box, and therefore installation structures are reduced, the occupied space of the mechanical pump is smaller, the axial space in the gear box is saved, the pump body is lighter and more miniaturized, and the gear box is lighter and more compact.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile accessories, in particular to an internally integrated mechanical pump and gear box. Background Art

[0002] In the current commercial vehicle electric drive industry, the primary lubrication sources for electric drive assemblies are electronic and mechanical oil pumps. Mechanical oil pumps offer more stable performance and lifespan, and lower costs, compared to electronic pumps for gearbox lubrication. Given the more compact layout requirements of electric drive gearboxes, mechanical oil pumps are also trending towards integration and miniaturization.

[0003] A search of prior art revealed Chinese patent publication number CN221393029U, published on July 23, 2024, which describes a "hybrid transmission." This mechanism integrates a mechanical pump into a hydraulic valve body, which is then mounted within the transmission's housing and integrated into the housing. Simply integrating the mechanical pump into the hydraulic valve body and mounting it on the inside surface of the transmission housing fails to fully utilize the housing space, occupies additional axial space, and increases the weight of the transmission, hindering its compactness and lightweight design. These issues urgently need to be addressed. Utility Model Content

[0004] The utility model discloses an internally integrated mechanical pump and a gear box, aiming to solve the technical problems existing in the prior art.

[0005] The utility model adopts the following technical solutions:

[0006] The utility model provides an internally integrated mechanical pump, which is used for oil transportation in a gear box; the mechanical pump comprises a shell and a conveying member; the shell is arranged in the gear box and is at least partially integrally formed with the gear box, and the shell has a accommodating chamber, an oil inlet channel and an oil outlet channel; the accommodating chamber is used to install the conveying member; one end of the oil inlet channel is connected to the oil inlet, and the other end is connected to the accommodating chamber; one end of the oil outlet channel is connected to the oil outlet, and the other end is connected to the accommodating chamber; the conveying member is rotatably connected to the shell and meshes with the gear set of the gear box for transmission, and is used to transport the gear box oil from the oil inlet channel to the oil outlet channel via the accommodating chamber.

[0007] In the internally integrated mechanical pump of the present invention, the housing includes a rear housing and a cover body; the rear housing is integrally formed with the gear box and has an accommodating recess and the oil inlet and oil outlet passages; the cover body is arranged on the accommodating recess of the rear housing and seals the edge of the accommodating recess.

[0008] In the internally integrated mechanical pump of the present invention, the flow area of ​​one side of the oil inlet passage and / or the oil outlet passage that is connected to the accommodating chamber is larger than the flow area of ​​the other side.

[0009] In the internally integrated mechanical pump of the present invention, the oil inlet passage includes a first feed section and a second feed section; one end of the first feed section is connected to the oil inlet, and the other end is connected to one end of the second feed section; the other end of the second feed section is connected to the accommodating cavity, and the extension direction of the second feed section is parallel to the rotation axis of the conveying member.

[0010] In the internally integrated mechanical pump of the present invention, the oil outlet passage includes a first discharge section and a second discharge section; one end of the first discharge section is connected to the accommodating chamber, and the other end is connected to the second discharge section, and the extension direction of the first discharge section is parallel to the rotation axis of the conveying member; the second discharge section is connected to the oil outlet.

[0011] In the internally integrated mechanical pump of the present invention, the oil inlet and the oil outlet are located on the same side of the conveying member.

[0012] In the internally integrated mechanical pump of the present invention, the conveying member includes an outer rotor, an inner rotor, a rotating shaft and a gear; the outer rotor is movably arranged in the accommodating chamber; the inner rotor is arranged on the inner side of the outer rotor; the rotating shaft is fixedly connected to the inner rotor and is rotatably connected to the housing; the gear is installed on the rotating shaft and can engage with the gear set of the gear box for transmission.

[0013] In the internally integrated mechanical pump of the present invention, the inner rotor and the rotating shaft are detachably connected via a flat key.

[0014] In the internally integrated mechanical pump of the present invention, the housing has a first bearing mounting hole and a second bearing mounting hole; bearings are respectively mounted in the first bearing mounting hole and the second bearing mounting hole; and the two sides of the rotating shaft are respectively mounted on the bearings.

[0015] In a second aspect, the present invention further provides a gearbox comprising any of the above-mentioned internally integrated mechanical pumps and a gearbox; the internally integrated mechanical pump is disposed in the gearbox and immersed in the gearbox oil of the gearbox.

[0016] The technical solution adopted by the utility model can achieve the following beneficial effects:

[0017] The utility model mainly provides an internally integrated mechanical pump. Based on the fact that the housing is arranged to be partially integrally formed with the gear box, there is no need to set up an additional connecting structure to connect the housing and the gear box, thereby reducing the installation structure, so that the mechanical pump occupies less space, saving axial space in the gear box, making the pump body more lightweight and miniaturized, thereby making the gear box lighter and more compact, and based on the fact that the gear set of the gear box provides power for the conveying member, there is no need to set up other power elements, thereby further reducing the size of the mechanical pump, making the pump body more lightweight and miniaturized. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments, which constitute a part of the present invention. The schematic embodiments of the present invention and their descriptions explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0019] Figure 1 This is a schematic structural diagram of an internally integrated mechanical pump of the present utility model;

[0020] Figure 2 This is one of the internal structure diagrams of an integrated mechanical pump of the present invention;

[0021] Figure 3 This is the second schematic diagram of the internal structure of an integrated mechanical pump of the present invention;

[0022] Figure 4 This is a schematic diagram of the explosion structure of an internally integrated mechanical pump of the utility model.

[0023] Description of reference numerals:

[0024] 1. Housing; 11. Accommodating chamber; 12. Oil inlet; 121. First feed section; 122. Second feed section; 1221. First section; 1222. Second section; 13. Oil outlet; 131. First discharge section; 1311. Third section; 1312. Fourth section; 132. Second discharge section; 14. Oil inlet; 15. Oil outlet; 16. Rear housing; 161. Accommodating recess; 17. Cover; 18. First bearing mounting hole; 19. Second bearing mounting hole; 2. Conveying member; 21. Outer rotor; 22. Inner rotor; 23. Rotating shaft; 24. Gear; 25. Flat key; 26. Elastic retaining ring; 27. Bearing; 3. Filter. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the present invention more clear, the technical solution of the present invention will be clearly and completely described below in conjunction with the specific embodiments of the present invention and the corresponding drawings. In the description of the present invention, it should be noted that the term "or" is generally used in the sense of including "and / or" unless the content clearly indicates otherwise.

[0026] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or a magnetic connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be a connection between the two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances. In addition, in the description of this application, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance. In the description of the present invention, the meaning of "multiple" is at least two, such as two, three or more, etc., unless otherwise clearly specified and limited.

[0027] Obviously, the embodiments described are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] In order to solve the problems existing in the prior art, an embodiment of the present application provides an internally integrated mechanical pump.

[0029] like Figures 1-4 As shown, an internally integrated mechanical pump is used for oil transportation in a gearbox; it comprises a housing 1 and a conveying member 2; the housing 1 is arranged in the gearbox and is at least partially integrally formed with the gearbox, and the housing 1 has a accommodating chamber 11, an oil inlet passage 12 and an oil outlet passage 13; the accommodating chamber 11 is used to install the conveying member 2; one end of the oil inlet passage 12 is connected to the oil inlet 14, and the other end is connected to the accommodating chamber 11; one end of the oil outlet passage 13 is connected to the oil outlet 15, and the other end is connected to the accommodating chamber 11; the conveying member 2 is rotatably connected to the housing 1, and is meshed with the gear set of the gearbox for transmission, and is used to transport the gearbox oil from the oil inlet passage 12 to the oil outlet passage 13 via the accommodating chamber 11.

[0030] The present utility model mainly provides an internally integrated mechanical pump. Based on the setting that the housing 1 is partially integrally formed with the gear box, there is no need to set up an additional connecting structure to connect the housing 1 to the gear box, thereby reducing the installation structure, making the mechanical pump occupy a smaller space, saving axial space in the gear box, making the pump body more lightweight and miniaturized, thereby making the gear box lighter and more compact, and based on the gear set of the gear box providing power for the conveying member 2, there is no need to set up other power elements, thereby further reducing the size of the mechanical pump, making the pump body more lightweight and miniaturized.

[0031] In some preferred embodiments, Figure 2-Figure 4 As described above, the housing 1 includes a rear housing 16 and a cover 17; the rear housing 16 is integrally formed with the gear box, and has a receiving recess 161 and an oil inlet channel 12 and an oil outlet channel 13; the cover 17 covers the receiving recess 161 of the rear housing 16, and seals the edge of the receiving recess 161; based on the integration of the rear housing 16 on the gear box (specifically the inner wall of the gear box, such as integral casting), and providing the receiving recess 161 on the rear housing 16 to install the conveying member 2, then, during installation, the conveying member 2 is installed first, and then the cover 17 is installed to facilitate positioning of the conveying member 2; preferably, the cover 17 and the rear housing 16 are detachably connected by bolts.

[0032] In some preferred embodiments, the flow area on one side of the oil inlet 12 and / or the oil outlet 13 connected to the accommodating chamber 11 is larger than the flow area on the other side; a smaller oil inlet 12 can increase the flow rate of the fluid, thereby improving the suction efficiency, while also reducing cavitation and being conducive to the compactness of the structural design.

[0033] In some preferred embodiments, Figure 2 and Figure 3 As shown, the oil inlet passage 12 includes a first feed section 121 and a second feed section 122; one end of the first feed section 121 is connected to the oil inlet 14, and the other end is connected to one end of the second feed section 122; the other end of the second feed section 122 is connected to the accommodating chamber 11, and the extension direction of the second feed section is parallel to the rotation axis of the conveying member 2; preferably, the flow cross-sectional area of ​​the second feed section 122 is larger than the flow cross-sectional area of ​​the first feed section 121.

[0034] Preferably, the second feed section 122 includes a first section 1221 connected to the circumferential side wall of the accommodating chamber 11 and a second section 1222 formed by the concave portion of the accommodating chamber 11. One end of the first section 1221 is connected to the first feed section 121, and the other end is connected to the second section 1222. If extended axially, the side wall is connected to the second section 1222 and the circumferential side wall of the accommodating chamber 11; thereby, the circumferential surface of the conveying member 2 can be lubricated to reduce wear; further preferably, the first section 1221 is surrounded by the rear shell 16 and the cover body 17 to facilitate the installation of the conveying member 2.

[0035] Preferably, the first section 1221 extends vertically upward to reduce the size of the mechanical pump.

[0036] In some preferred embodiments, Figure 2 and Figure 3 As shown, the oil outlet passage 13 includes a first outlet section 131 and a second outlet section 132; one end of the first outlet section 131 is connected to the accommodating chamber 11, and the other end is connected to the second outlet section 132, and the extension direction of the first outlet section 131 is parallel to the rotation axis of the conveying member 2; the second outlet section 132 is connected to the oil outlet 15; preferably, the flow cross-sectional area of ​​the first outlet section 131 is larger than the flow cross-sectional area of ​​the second outlet section 132.

[0037] Preferably, the first discharge section 131 includes a third section 1311 formed by the concave portion of the accommodating chamber 11 and a fourth section 1312 connected to the circumferential side wall of the accommodating chamber 11. One end of the fourth section 1312 is connected to the second discharge section 132, and the other end is connected to the third section 1311. If extended axially, the side wall is connected to the third section 1311 and the circumferential side wall of the accommodating chamber 11; thereby, the circumferential surface of the conveying member 2 can be lubricated to reduce wear; further preferably, the fourth section 1312 is surrounded by the rear shell 16 and the cover body 17 to facilitate the installation of the conveying member 2.

[0038] Preferably, the fourth section 1312 is tilted downward along the direction of oil flow to promote rapid flow of gear oil, while also making the mechanical pump design compact, thereby saving materials and simplifying the gearbox housing manufacturing process. Further preferably, the third section 1311 is tilted upward along the direction of oil flow; further preferably, the tilt angle is 8° (the angle between the extension direction of the fourth section 1312 and the horizontal direction), to increase oil delivery speed while facilitating docking and installation with the oil circuit of gearbox A.

[0039] In some preferred embodiments, the oil inlet 14 and the oil outlet 15 are located on the same side of the conveying member 2 to facilitate connection with the oil circuit on the gearbox.

[0040] In some preferred embodiments, the flow cross-sectional area of ​​the oil inlet passage 12 is larger than that of the oil outlet passage 13 , so as to ensure efficient operation of the mechanical pump.

[0041] In some preferred embodiments, Figure 2 and Figure 4As shown, the conveying element 2 includes an outer rotor 21, an inner rotor 22, a rotating shaft 23, and a gear 24. The outer rotor 21 is movably mounted within the accommodating chamber 11. The inner rotor 22 is mounted inside the outer rotor 21. The rotating shaft 23 is fixedly connected to the inner rotor 22 and is rotatably connected to the housing 1. The gear 24 is mounted on the rotating shaft 23 and is capable of meshing with the gear train of the gearbox. The inner rotor 22 is fixed to the rotating shaft 23 and forms eccentric contact with the outer rotor 21 within the accommodating chamber 11, together forming four working chambers. As the inner and outer rotors rotate, the volume of the working chambers changes, causing oil suction and pressure to flow, enabling the intake and discharge of engine oil. As the inner and outer rotors rotate, the volume of the working chambers of the accommodating chamber 11 changes, causing oil suction and pressure to flow, enabling the intake and discharge of engine oil. In traditional installation methods, mechanical pumps require two centering steps: first, centering the mechanical pump itself, and then centering the mechanical pump and the housing. This multiple centering process not only increases operational difficulty but also affects the operational stability of the mechanical pump. The utility model directly mounts the mechanical pump shaft 23 on the gear box housing by integrating the mechanical pump internally, which simplifies the installation process and only requires one centering, thereby effectively improving the operating stability of the mechanical pump.

[0042] Preferably, the gear 24 is fixed in position by a circlip 26 .

[0043] In some preferred embodiments, Figure 4 As shown, the inner rotor 22 and the rotating shaft 23 are detachably connected via a flat key 25 ; specifically, keyways are respectively provided on the rotating shaft 23 and the inner rotor 22 , and the two keyways form an accommodating portion for accommodating the flat key 25 .

[0044] In some preferred embodiments, Figure 4 As shown, the housing 1 has a first bearing mounting hole 18 and a second bearing mounting hole 19 ; bearings 27 are respectively installed in the first bearing mounting hole 18 and the second bearing mounting hole 19 ; and the two sides of the rotating shaft 23 are respectively installed on the bearings 27 .

[0045] In some preferred embodiments, the internally integrated mechanical pump further includes a filter 3 , the outlet of the filter 3 being connected to the oil inlet 14 for filtering the gear oil entering the mechanical pump.

[0046] Preferably, the bearing 27 is a needle bearing.

[0047] Example 2

[0048] This embodiment provides a gearbox comprising the internally integrated mechanical pump of Embodiment 1 and a gearbox; the internally integrated mechanical pump is disposed within the gearbox and submerged in the gearbox oil. The gearbox of the present invention utilizes an internally integrated mechanical pump housing integrally formed with the inner wall of the gearbox, thereby reducing the weight and volume of the gearbox. Furthermore, the internally integrated mechanical pump is submerged in the gear oil, facilitating its delivery.

[0049] The embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the purpose of the present invention and the claims, all of which are within the protection of the present invention.

Claims

1. An internally integrated mechanical pump, which is used for oil delivery in a gearbox; characterized in that: comprising a housing and a conveying member; The housing is disposed in the gear box and is at least partially integrally formed with the gear box. The housing has an accommodating cavity, an oil inlet passage, and an oil outlet passage. The accommodating cavity is used for installing the conveying member; One end of the oil inlet passage is connected to the oil inlet, and the other end is connected to the accommodating cavity; One end of the oil outlet passage is connected to the oil outlet, and the other end is connected to the accommodating cavity; The conveying member is rotatably connected to the housing and meshes with the gear set of the gear box for transmission, and is used to convey the gear box oil from the oil inlet passage to the oil outlet passage via the accommodating chamber.

2. The internally integrated mechanical pump according to claim 1, characterized in that: The housing comprises a rear housing and a cover; The rear housing is integrally formed with the gear box and has a receiving recess, the oil inlet passage, and the oil outlet passage; The cover body is arranged to cover the accommodating recess of the rear housing and seal the edge of the accommodating recess.

3. The internally integrated mechanical pump according to claim 1 or 2, characterized in that: The flow area of ​​one side of the oil inlet passage and / or the oil outlet passage connected to the accommodating cavity is larger than the flow area of ​​the other side.

4. The internally integrated mechanical pump according to claim 1 or 2, characterized in that: The oil inlet passage includes a first feed section and a second feed section; One end of the first feed section is connected to the oil inlet, and the other end is connected to one end of the second feed section; The other end of the second feeding section is connected to the accommodating cavity, and the extending direction of the second feeding section is parallel to the rotation axis of the conveying member.

5. The internally integrated mechanical pump according to claim 1 or 2, characterized in that: The oil outlet passage includes a first outlet section and a second outlet section; One end of the first discharge section is connected to the accommodating cavity, and the other end is connected to the second discharge section. The extending direction of the first discharging section is parallel to the rotation axis of the conveying member; The second discharge section is connected to the oil outlet.

6. The internally integrated mechanical pump according to claim 1, characterized in that: The oil inlet and the oil outlet are located on the same side of the conveying member.

7. The internally integrated mechanical pump according to claim 1, characterized in that: The conveying member includes an outer rotor, an inner rotor, a rotating shaft and a gear; The outer rotor is movably disposed in the accommodating cavity; The inner rotor is arranged inside the outer rotor; The rotating shaft is fixedly connected to the inner rotor and is rotatably connected to the housing; The gear is mounted on the rotating shaft and can be meshed with the gear set of the gear box for transmission.

8. The internally integrated mechanical pump according to claim 7, characterized in that: The inner rotor and the rotating shaft are detachably connected via a flat key.

9. The internally integrated mechanical pump according to claim 7, characterized in that: The housing is provided with a first bearing mounting hole and a second bearing mounting hole; Bearings are respectively installed in the first bearing mounting hole and the second bearing mounting hole; Both sides of the rotating shaft are respectively installed on the bearings.

10. A gear box, characterized in that: It comprises the internally integrated mechanical pump and gear box according to any one of claims 1 to 9; the internally integrated mechanical pump is arranged in the gear box and immersed in the gear box oil of the gear box.

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