Direct-connected duplex gear pump and engine

Abstract

This utility model discloses a direct-drive double gear pump (52) and an engine. The direct-drive double gear pump (52) includes a first pump body (47), a first drive shaft (13), a second pump body (48), a second drive shaft (55), a transmission cover (9), a connecting shaft (5), and a transmission gear (3). The first drive shaft (13) is disposed in the first pump body (47) and is rotatably connected to the first pump body (47). The second pump body (48) is connected to the first pump body (47). The second drive shaft (55) is disposed in the second pump body (48) and is rotatably connected to the second pump body (48). The second drive shaft (55) is connected to the first drive shaft (13), and the first drive shaft (13) and the second drive shaft (55) are coaxial. The transmission cover (9) is connected to the first pump body (47), and the transmission cover (9) and the second pump body (48) are located at both ends of the first pump body (47). The direct-drive double gear pump (52) can improve the consistency and stability of hydraulic pumps and double gear pumps.

Description

Technical Field

[0001] This utility model belongs to the field of engine technology, and in particular relates to a direct-drive double gear pump and engine. Background Technology

[0002] A gear pump is a rotary pump that transports or pressurizes liquids by relying on the change and movement of the working volume formed between the pump body and meshing gears. It consists of two gears, a pump body, and front and rear covers forming two enclosed spaces. When the gears rotate, the volume of the space on the disengaged side increases, creating a vacuum that draws in liquid. Conversely, the volume of the space on the meshing side decreases, forcing the liquid into the pipeline. The suction chamber and discharge chamber are separated by the meshing line of the two gears.

[0003] A tandem gear pump consists of two gear pumps connected in parallel, allowing for either individual or combined oil supply. In existing technology, the power components of a vehicle's hydraulic system include a hydraulic pump mount and a tandem gear pump. The hydraulic pump mount connects to the engine, and the tandem gear pump connects the hydraulic pump mount to the hydraulic system. However, mismatches between the hydraulic pump mount and the tandem gear pump are prone to occur, leading to poor consistency, low stability, short service life, and resource waste. Utility Model Content

[0004] This utility model aims to at least partially solve one of the technical problems in the related art.

[0005] This utility model provides a direct-drive double gear pump, comprising:

[0006] First pump body;

[0007] A first drive shaft is disposed in the first pump body and is rotatably connected to the first pump body;

[0008] The second pump body is connected to the first pump body;

[0009] The second drive shaft is disposed in the second pump body and is rotatably connected to the second pump body. The second drive shaft is connected to the first drive shaft, and the first drive shaft and the second drive shaft are coaxial.

[0010] A transmission cover is connected to the first pump body, and the transmission cover and the second pump body are located at opposite ends of the first pump body;

[0011] A connecting shaft, wherein the connecting shaft is disposed in the transmission cover and is rotatably connected to the transmission cover; and

[0012] A transmission gear is located at both ends of the transmission cover, and the transmission gear is connected to the connecting shaft.

[0013] This utility model discloses a direct-drive double gear pump comprising a first pump body, a first drive shaft, a second pump body, a second drive shaft, a transmission cover, a connecting shaft, and a transmission gear. By connecting the rotating gear shaft to the drive gear shaft, the functions of both the hydraulic pump base and the double gear pump are realized. The structure is compact and effectively solves the problem of poor matching between the hydraulic pump base and the double gear pump, avoiding the impact on service life due to poor matching.

[0014] In some embodiments, the connecting shaft and the first drive shaft are connected by a spline.

[0015] Using a spline connection between the first drive shaft and the connecting shaft can transmit a large torque, and it also has good centering, achieving a precise connection.

[0016] In some embodiments, the connecting shaft and the transmission gear are connected by a flat key.

[0017] Using a flat key to connect the transmission gear and the connecting shaft is not only simple to process, but also highly forgiving, and convenient to install and maintain.

[0018] In some embodiments, the device further includes a first fastener and a first pressure plate sleeved on the first fastener. The first fastener is connected to the end of the connecting shaft away from the first drive shaft, and the first pressure plate abuts against the transmission gear. The first fastener and the first pressure plate are used to axially limit the transmission gear.

[0019] The transmission gear is axially limited by the first fastener and the first pressure plate. This method is not only simple in structure and easy to operate, but also provides uniform force and low damage.

[0020] In some embodiments, the first pump body includes:

[0021] A first pump cover, which is connected to the transmission cover;

[0022] A first pump housing, the first pump housing being connected to the first pump cover; and

[0023] The second pump cover is connected to the first pump body, and the first pump cover and the second pump cover are located at both ends of the first pump body along its axial direction;

[0024] And / or, the second pump body includes:

[0025] A third pump cover is connected to the first pump body;

[0026] A second pump housing, the second pump housing being connected to the third pump cover; and

[0027] A fourth pump cover is connected to the second pump housing, and the third and fourth pump covers are located at both ends of the second pump housing along its axial direction.

[0028] By setting the first pump body to include a first pump cover, a first pump housing, and a second pump cover, it is not only convenient to process and produce the first pump body, but also convenient to install other parts inside the first pump body.

[0029] By setting the second pump body to include the third pump cover, the second pump housing, and the fourth pump cover, it is not only convenient to process and produce the second pump body, but also convenient to install other parts inside the second pump body.

[0030] In some embodiments, the system further includes two first bushings and two first bushings, the two first bushings being located on both sides of the first drive shaft, the two first bushings being located on both sides of the first drive shaft, the first bushings being sleeved on the first drive shaft, and each first bushing being sleeved on one of the first bushings.

[0031] By setting the first bushing, not only can the first drive shaft be protected, but the first drive gear can also be axially limited. The first bushing can also provide sliding friction.

[0032] In some embodiments, a first sealing ring is provided between the first pump cover and the first bushing located on the side of the first drive shaft near the first pump cover.

[0033] The sealing effect between the first pump cover and the first shaft sleeve is achieved by setting a first sealing ring.

[0034] In some embodiments, a skeleton oil seal is provided between the first pump cover and the first drive shaft.

[0035] By setting up a skeleton oil seal, a sealing effect is achieved between the first pump cover and the first drive shaft.

[0036] In some embodiments, it also includes:

[0037] A first driving gear is sleeved on and connected to the first driving shaft;

[0038] The second driving gear is sleeved on the second driving shaft and connected to the second driving shaft;

[0039] A first driven shaft is disposed in the first pump body and is rotatably connected to the first pump body;

[0040] A first driven gear is sleeved on and connected to the first driven shaft, and the first driven gear meshes with the first driving gear;

[0041] A second driven shaft, the second driven shaft being disposed within the second pump body, and the second driven shaft being rotatably connected to the second pump body; and

[0042] The second driven gear is sleeved on and connected to the second driven shaft, and meshes with the second driving gear.

[0043] The function of a double gear pump is achieved by setting a first driving gear, a first driven gear, a second driving gear, and a second driven gear.

[0044] This utility model also provides an engine, comprising:

[0045] Engine body; and

[0046] The aforementioned direct-drive double gear pump is connected to the engine body.

[0047] Because the engine includes the aforementioned direct-drive double gear, it also has the advantages of compact structure and long service life. Attached Figure Description

[0048] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0049] Figure 1 This is a schematic diagram of the structure of an engine provided in one embodiment of the present invention;

[0050] Figure 2 This is a cross-sectional view of a direct-drive double gear pump provided in one embodiment of the present invention;

[0051] Figure 3 This is a schematic diagram of the structure of a direct-drive double gear pump provided in one embodiment of the present invention. Figure 1 ;

[0052] Figure 4 This is a schematic diagram of the structure of a direct-drive double gear pump provided in one embodiment of the present invention. Figure 2 .

[0053] Figure label:

[0054] 1. First fastener; 2. First pressure plate; 3. Transmission gear; 4. Flat key; 5. Connecting shaft; 6. Ninth bushing; 7. Bearing; 8. First retaining ring; 9. Transmission cover; 10. Second sealing ring; 11. Second fastener; 12. First pump cover; 13. First drive shaft; 14. Second retaining ring; 15. Skeleton oil seal; 16. Pressure cap; 17. First sealing strip; 18. First sealing retaining ring; 19. First pump housing; 20. First driven gear; 21. First bushing; 22. First bushing; 23. Second cylindrical pin; 24. Third sealing ring; 25. Second pump cover; 26. Bidirectional oil seal; 27. Second pressure plate; 28. Fourth sealing ring; 29. ​​Coupling; 30. Third fastener; 31. First washer; 32. Third pump cover; 33. Fourth fastener; 34. 35. Second pump housing; 36. Second drive gear; 37. Second driven gear; 38. Third bushing; 39. Fifth sealing ring; 40. Third bushing; 41. Sixth sealing retaining ring; 42. Fourth bushing; 43. Sixth sealing strip; 44. Fourth pump cover; 45. Fifth fastener; 46. Second washer; 47. Sixth fastener; 48. First pump body; 49. Second pump body; 50. Second bushing; 51. Engine body; 52. Direct-drive double gear pump; 53. First drive gear; 54. First driven shaft; 55. Second drive shaft; 56. Second driven shaft; 57. First cylindrical pin; 58. Seventh sealing ring; 59. First sealing ring; 60. Second sealing retaining ring; 61. Third cylindrical pin; 62. Fourth cylindrical pin; 63. Fourth bushing. Detailed Implementation

[0055] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be particularly noted that the following embodiments are for illustrative purposes only and do not limit the scope of the application. Similarly, the following embodiments are only some, not all, embodiments of the present application, and all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of the present application.

[0056] The terms "first," "second," and "third" used in the embodiments of this application are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first," "second," or "third" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified. All directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationships and movement of components in a specific posture (as shown in the figures). If the specific posture changes, the directional indication will also change accordingly. The terms "comprising" and "having," and any variations thereof, in the embodiments of this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or components inherent to these processes, methods, products, or devices.

[0057] A direct-drive double gear pump includes a first pump body, a first drive shaft, a second pump body, a second drive shaft, a transmission cover, a connecting shaft, and a transmission gear. The first drive shaft is disposed within the first pump body and rotatably connected to it. The second pump body is connected to the first pump body. The second drive shaft is disposed within the second pump body and rotatably connected to it, and is connected to the first drive shaft; the first and second drive shafts are coaxial. The transmission cover is connected to the first pump body, and the transmission cover and the second pump body are located at opposite ends of the first pump body. The connecting shaft is disposed within the transmission cover and rotatably connected to it. The transmission gear and the first pump body are located at opposite ends of the transmission cover, and the transmission gear is connected to the connecting shaft.

[0058] This utility model discloses a direct-drive double gear pump comprising a first pump body, a first drive shaft, a second pump body, a second drive shaft, a transmission cover, a connecting shaft, and a transmission gear. By connecting the rotating gear shaft to the drive gear shaft, the functions of both the hydraulic pump base and the double gear pump are realized. The structure is compact and effectively solves the problem of poor matching between the hydraulic pump base and the double gear pump, avoiding the impact on service life due to poor matching.

[0059] like Figure 1 As shown, in some embodiments, the engine includes an engine body 51 and a direct-drive double gear pump 52 connected to the engine body 51. The direct-drive double gear pump 52 is directly connected to the engine body 51, realizing the functions of both the hydraulic pump base and the double gear pump. It has a compact structure and can effectively solve the problem of poor matching between the hydraulic pump base and the double gear pump, avoiding the impact on service life due to poor matching between the hydraulic pump base and the double gear pump.

[0060] like Figures 2-4 As shown, in some embodiments, the direct-drive double gear pump 52 includes a first pump body 47 (i.e., the front pump body). A first drive shaft 13 is disposed in the first pump body 47. The first drive shaft 13 is rotatably connected to the first pump body 47. A first driven shaft 54 ​​is disposed in the first pump body 47. The first driven shaft 54 ​​is rotatably connected to the first pump body 47. A first drive gear 53 is sleeved on the first drive shaft 13 and connected to the first drive shaft 13. When the first drive shaft 13 rotates, it can drive the first drive gear 53 to rotate. A first driven gear 20 is sleeved on the first driven shaft 54 ​​and connected to the first driven shaft 54. The first drive gear 53 meshes with the first driven gear 20. When the first drive gear 53 rotates, it can drive the first driven gear 20 to rotate. The first drive gear 53 and the first driven gear 20 realize the gear pump function.

[0061] Specifically, the first pump body 47 includes a first pump cover 12 (i.e., the front cover of the front pump), a first pump housing 19 (i.e., the front pump housing), and a second pump cover 25 (i.e., the rear cover of the front pump). The first pump cover 12 and the second pump cover 25 are located at opposite ends of the first pump housing 19. The first pump cover 12 is connected to the first pump housing 19. The second pump cover 25 is connected to the first pump housing 19.

[0062] In some embodiments, the first pump cover 12 and the first pump housing 19 are positioned by a first cylindrical pin 57, and then connected by a sixth fastener 46. For example, the sixth fastener 46 is an internal hexagon head screw.

[0063] In some embodiments, the positioning between the first pump housing 19 and the second pump cover is achieved by the second cylindrical pin 23, and the connection between the first pump housing 19 and the second pump cover is achieved by the sixth fastener 46.

[0064] In some embodiments, a seventh sealing ring 58 is provided between the first pump cover 12 and the first pump housing 19 to achieve a sealing effect between the first pump cover 12 and the first pump housing 19. For example, the seventh sealing ring 58 is a rectangular sealing ring.

[0065] In some embodiments, a first sealing ring 59 is provided between the first pump housing 19 and the second pump cover 25 to achieve a sealing effect between the first pump housing 19 and the second pump cover 25. For example, the first sealing ring 59 is a rectangular sealing ring.

[0066] In some embodiments, two first bushings 21 are provided. The two first bushings 21 are located on both sides of the first drive gear 53. Two first bushings 22 are also provided. The two first bushings 22 are located on both sides of the first drive gear 53. The first bushings 22 are fitted onto the first drive shaft 13. Each first bushing 21 is fitted onto one of the first bushings 22. By providing the first bushings 21, not only can the first drive shaft 13 be protected, but the first drive gear 53 can also be axially limited. By providing the first bushings 22, sliding friction can be achieved.

[0067] In some embodiments, one first bushing 21 is located between the first pump cover 12 and the first pump housing 19, and a first sealing ring 18 is disposed between the first bushing 21 and the first pump cover 12. A first sealing strip 17 is disposed inside the first sealing ring 18. Another first bushing 21 is located between the first pump housing 19 and the second pump cover 25, and a second sealing ring 60 is disposed between the first bushing 21 and the second pump cover 25. A second sealing strip is disposed inside the second sealing ring 60.

[0068] In some embodiments, two second bushings 49 are provided. The two second bushings 49 are located on both sides of the first driven gear 20. Two second bushings 50 are also provided. The two second bushings 50 are located on both sides of the first driven gear 20. The second bushings 50 are sleeved on the first driven shaft 54. Each second bushing 49 is sleeved on one of the second bushings 50. By providing the second bushings 49, not only can the first driven shaft 54 ​​be protected, but the first driven gear 20 can also be axially limited. The second bushings 50 can provide sliding friction.

[0069] In some embodiments, one second bushing 49 is located between the first pump cover 12 and the first pump housing 19, and a third sealing ring is provided between the second bushing 49 and the first pump cover 12. A third sealing strip is provided inside the third sealing ring. Another second bushing 49 is located between the first pump housing 19 and the second pump cover 25, and a fourth sealing ring is provided between the second bushing 49 and the second pump cover 25. A fourth sealing strip is provided inside the fourth sealing ring.

[0070] In some embodiments, the first drive shaft 13 passes through the first pump cover 12. A skeleton oil seal 15 is provided between the first pump cover 12 and the first drive shaft 13 to achieve a sealing effect between the first pump cover 12 and the first drive shaft 13.

[0071] Specifically, a second retaining ring 14 is also provided between the first pump cover 12 and the first drive shaft 13. The second retaining ring 14 is located on the side of the skeleton oil seal 15 away from the first drive gear 53, and is used to limit the skeleton oil seal 15. A pressure cap 16 is also provided between the first pump cover 12 and the first drive shaft 13. For example, the pressure cap 16 is a fluororubber pressure cap.

[0072] In some embodiments, a bidirectional oil seal 26 is provided between the first drive shaft 13 and the second pump cover 25. A second pressure plate 27 is provided on the side of the bidirectional oil seal 26 away from the first drive shaft 13, and the second pressure plate 27 is used to axially limit the bidirectional oil seal 26.

[0073] In some embodiments, the direct-drive double gear pump 52 includes a second pump body 48 (i.e., a rear pump body). A second drive shaft 55 is disposed in the second pump body 48. The second drive shaft 55 is rotatably connected to the second pump body 48. A second driven shaft 56 is disposed in the second pump body 48. The second driven shaft 56 is rotatably connected to the second pump body 48. A second drive gear 35 is sleeved on the second drive shaft 55 and connected to the second drive shaft 55. When the second drive shaft 55 rotates, it drives the second drive gear 35 to rotate. A second driven gear 36 is sleeved on the second driven shaft 56 and connected to the second driven shaft 56. The second drive gear 35 meshes with the second driven gear 36. When the second drive gear 35 rotates, it drives the second driven gear 36 to rotate. The second drive gear 35 and the second driven gear 36 realize the function of a gear pump.

[0074] Specifically, the second pump body 48 (i.e., the rear pump body) includes a third pump cover 32 (i.e., the front cover of the rear pump), a second pump housing 34 (i.e., the rear pump housing), and a fourth pump cover 43 (i.e., the rear pump rear cover). The third pump cover 32 and the fourth pump cover 43 are located at opposite ends of the second pump housing 34. The third pump cover 32 is connected to the second pump housing 34. The fourth pump cover 43 is connected to the second pump housing 34.

[0075] In some embodiments, the third pump cover 32 and the second pump housing 34 are positioned by a third cylindrical pin 61, and then connected by a fifth fastener 44. A second washer 45 is fitted onto the fifth fastener 44. For example, the fifth fastener 44 is a hexagonal head bolt, and the second washer 45 is a spring washer.

[0076] In some embodiments, the second pump housing 34 and the fourth pump cover 43 are positioned by the fourth cylindrical pin 62, and then connected by the fifth fastener 44.

[0077] In some embodiments, a sixth sealing ring is provided between the third pump cover 32 and the second pump housing 34 to achieve a sealing effect between the third pump cover 32 and the second pump housing 34. For example, the sixth sealing ring is a rectangular sealing ring.

[0078] In some embodiments, a fifth sealing ring 38 is provided between the second pump housing 34 and the fourth pump cover 43 to achieve a sealing effect between the second pump housing 34 and the fourth pump cover 43. For example, the fifth sealing ring 38 is a rectangular sealing ring.

[0079] In some embodiments, two third bushings 37 are provided. The two third bushings 37 are located on both sides of the second drive gear 35. Two third bushings 39 are also provided. The two third bushings 39 are located on both sides of the second drive gear 35. The third bushings 39 are fitted onto the second drive shaft 55. Each third bushing 37 is fitted onto one of the third bushings 39. By providing the third bushings 37, not only can the second drive shaft 55 be protected, but the second drive gear 35 can also be axially limited. By providing the third bushings 39, sliding friction can be achieved.

[0080] In some embodiments, one third bushing 37 is located between the second pump housing 34 and the third pump cover 32, and a fifth sealing ring is provided between the third bushing 37 and the third pump cover 32. A fifth sealing strip is provided inside the fifth sealing ring. Another third bushing 37 is located between the second pump housing 34 and the fourth pump cover 43, and a sixth sealing ring is provided between the third bushing 37 and the fourth pump cover 43. A sixth sealing strip is provided inside the sixth sealing ring.

[0081] In some embodiments, two fourth bushings 41 are provided. The two fourth bushings 41 are located on both sides of the second driven gear 36. Two fourth bushings 63 are also provided. The two fourth bushings 63 are located on both sides of the second driven gear 36. The fourth bushings 63 are fitted onto the second driven shaft 56. Each fourth bushing 41 is fitted onto one of the fourth bushings 63. By providing the fourth bushings 41, not only can the second driven shaft 56 be protected, but the second driven gear 36 can also be axially limited. The fourth bushings 63 can provide sliding friction.

[0082] In some embodiments, a third bushing 37 located between the third pump cover 32 and the second drive gear 35 and a fourth bushing 41 located between the third pump cover 32 and the second driven gear 36 are connected by a fourth fastener 33. Alternatively, the third bushing 37 located between the fourth pump cover 43 and the second drive gear 35 and the fourth bushing 41 located between the fourth pump cover 43 and the second driven gear 36 are connected by a fourth fastener 33. Exemplarily, the fourth fastener 33 is a cylindrical pin.

[0083] In some embodiments, the second pump cover 25 and the third pump cover 32 are connected by a third fastener 30. A first washer 31 is fitted onto the third fastener 30. Exemplarily, the third fastener 30 is an internal hex screw. Specifically, two third fasteners 30 are provided.

[0084] In some embodiments, a fourth sealing ring 28 is provided between the second pump cover 25 and the third pump cover 32. Exemplarily, the fourth sealing ring 28 is an O-ring.

[0085] In some embodiments, the first drive shaft 13 and the second drive shaft 55 are connected by a coupling 29.

[0086] In some embodiments, the direct-drive double gear pump 52 further includes a drive cover 9. The drive cover 9 is connected to the first pump cover 12.

[0087] Specifically, the transmission cover 9 is connected to the first pump cover 12 by a second fastener 11. For example, the second fastener 11 is a screw.

[0088] In some embodiments, a second sealing ring 10 is provided between the transmission cover 9 and the first pump cover 12. Exemplarily, the second sealing ring 10 is an O-ring.

[0089] In some embodiments, the direct-drive double gear pump 52 further includes a connecting shaft 5. The connecting shaft 5 is rotatably disposed in the transmission cover 9. A first drive shaft 13 extends out of the first pump cover 12 and into the transmission cover 9, and the first drive shaft 13 is connected to the connecting shaft 5 via a spline. The transmission gear 3 is connected to the connecting shaft 5 via a flat key 4. Bearings 7 are sleeved on the connecting shaft 5. Two bearings 7 are provided, and a ninth bushing 6 is disposed between the two bearings 7. By providing bearings 7, the rotation of the connecting shaft 5 is made smoother. The ninth bushing 6 is sleeved on the connecting shaft 5.

[0090] In some embodiments, a first retaining ring 8 is provided on the side of the bearing 7 away from the transmission gear 3 facing the first pump cover 12. The first retaining ring 8 is sleeved on the connecting shaft 5 and is used to axially limit the bearing 7.

[0091] In some embodiments, a first pressure plate 2 is sleeved on a first fastener 1, and the first fastener 1 is connected to the end of the connecting shaft 5 away from the first drive shaft 13. The first pressure plate 2 abuts against the transmission gear 3. The first pressure plate 2 and the first fastener 1 are used to axially limit the transmission gear 3.

[0092] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0093] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0094] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0095] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0096] In this utility model, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0097] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A direct-drive double gear pump (52), characterized in that, include: First pump body (47); A first drive shaft (13) is disposed in the first pump body (47) and is rotatably connected to the first pump body (47). Second pump body (48); the second pump body (48) is connected to the first pump body (47); The second drive shaft (55) is disposed in the second pump body (48) and is rotatably connected to the second pump body (48). The second drive shaft (55) is connected to the first drive shaft (13), and the first drive shaft (13) and the second drive shaft (55) are coaxial. A transmission cover (9) is connected to the first pump body (47), and the transmission cover (9) and the second pump body (48) are located at both ends of the first pump body (47); A connecting shaft (5) is disposed in the transmission cover (9) and is rotatably connected to the transmission cover (9); and The transmission gear (3) and the first pump body (47) are located at both ends of the transmission cover (9), and the transmission gear (3) is connected to the connecting shaft (5).

2. The direct-drive double gear pump (52) according to claim 1, characterized in that, The connecting shaft (5) and the first drive shaft (13) are connected by a spline.

3. The direct-drive double gear pump (52) according to claim 1, characterized in that, The connecting shaft (5) and the transmission gear (3) are connected by a flat key (4).

4. The direct-drive double gear pump (52) according to claim 1, characterized in that, It also includes a first fastener (1) and a first pressure plate (2) sleeved on the first fastener (1). The first fastener (1) is connected to the end of the connecting shaft (5) away from the first drive shaft (13). The first pressure plate (2) abuts against the transmission gear (3). The first fastener (1) and the first pressure plate (2) are used to axially limit the transmission gear (3).

5. The direct-drive double gear pump (52) according to claim 1, characterized in that, The first pump body (47) includes: The first pump cover (12) is connected to the transmission cover (9); A first pump housing (19), the first pump housing (19) being connected to the first pump cover (12); and The second pump cover is connected to the first pump body (47), and the first pump cover (12) and the second pump cover are located at both ends of the first pump body (47) along its axial direction; And / or, the second pump body (48) includes: The third pump cover (32) is connected to the first pump body (47); A second pump housing (34), the second pump housing (34) being connected to the third pump cover (32); and The fourth pump cover (43) is connected to the second pump housing (34), and the third pump cover (32) and the fourth pump cover (43) are located at both ends of the second pump housing (34) along its axial direction.

6. The direct-drive double gear pump (52) according to claim 5, characterized in that, It also includes two first bushings (21) and two first bushings (22), the two first bushings (21) are located on both sides of the first drive shaft (13), the two first bushings (22) are located on both sides of the first drive shaft (13), the first bushings (22) are sleeved on the first drive shaft (13), and each first bushing (21) is sleeved on one of the first bushings (22).

7. The direct-drive double gear pump (52) according to claim 6, characterized in that, A first sealing ring (18) is provided between the first pump cover (12) and the first bushing (21) located on the side of the first drive shaft (13) near the first pump cover (12).

8. The direct-drive double gear pump (52) according to claim 5, characterized in that, A skeleton oil seal (15) is provided between the first pump cover (12) and the first drive shaft (13).

9. The direct-drive double gear pump (52) according to claim 1, characterized in that, Also includes: The first drive gear (53) is sleeved on the first drive shaft (13) and connected to the first drive shaft (13); The second drive gear (35) is sleeved on the second drive shaft (55) and connected to the second drive shaft (55); A first driven shaft (54) is disposed in the first pump body (47) and is rotatably connected to the first pump body (47); The first driven gear (20) is sleeved on the first driven shaft (54) and connected to the first driven shaft (54). The first driven gear (20) meshes with the first driving gear (53). The second driven shaft (56) is disposed in the second pump body (48) and is rotatably connected to the second pump body (48); as well as The second driven gear (36) is sleeved on the second driven shaft (56) and connected to the second driven shaft (56). The second driven gear (36) meshes with the second driving gear (35).

10. An engine, characterized in that, include: Engine body (51); as well as The direct-drive double gear pump (52) as described in any one of claims 1-9 is connected to the engine body (51).

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