Marine cycloid gear pump

Abstract

The utility model discloses a cycloid gear pump for a ship, and aims to provide the cycloid gear pump for the ship, which can select the position of an oil inlet / outlet according to the actual arrangement requirement so as to facilitate the arrangement of an external oil inlet / outlet pipeline and improve the installation adaptability. The oil pump comprises a pump body, a pump cover, an oil suction cavity and an oil pressing cavity, the pump body is provided with two oil ports, one oil port is communicated with the oil suction cavity to form a pump body oil suction port, and the other oil port is communicated with the oil pressing cavity to form a pump body oil outlet. The pump cover is provided with two oil ports, one oil port is communicated with the oil suction cavity to form a pump cover oil suction port, and the other oil port is communicated with the oil pressing cavity to form a pump cover oil outlet. A detachable oil suction sealing plug is arranged in one of the pump body oil suction port and the pump cover oil suction port; and a detachable oil outlet sealing plug is arranged in one of the pump body oil outlet and the pump cover oil outlet.

Description

TECHNICAL FIELD

[0001] The utility model relates to gear pump technical field, concretely relates to a marine cycloidal gear pump. BACKGROUND

[0002] With the development of ocean transport, ocean fishing and other continuous development, the application of a large number of new technologies. The production technology of shipbuilding industry also develops with innovation. The technology of diesel engine makes a great progress, modern diesel engine has the advantages of small size, high speed, low noise etc. The gear box used in the ship machinery, the requirement of supporting oil pump is higher than before, it requires high speed, low noise, stable transmission, good reliability etc. The performance of the current marine supporting oil pump is better and better, but the improvement of the installation and arrangement of marine oil pump is less, the marine oil pump generally only includes an oil inlet and an oil outlet, after the oil pump is installed on the ship body, the position of oil inlet and outlet is fixed, the position of oil inlet and outlet cannot be selected according to actual needs, which is not conducive to the arrangement of external oil inlet and outlet pipeline, especially in the compact space, the position of oil inlet and outlet is not suitable, which will greatly affect the installation and arrangement of external oil inlet and outlet pipeline. SUMMARY

[0003] The first purpose of the utility model is to provide a marine cycloidal gear pump, which can select the position of oil inlet and outlet according to actual arrangement needs, so as to facilitate the arrangement of external oil inlet and outlet pipeline, thereby improving the installation adaptability.

[0004] The second purpose of the utility model is to provide a marine cycloidal gear pump, which can improve the lubrication performance of the pump.

[0005] The technical scheme of the utility model is:

[0006] The utility model provides a kind of marine cycloidal gear pump, including pump body, pump cover and oil suction cavity and oil pressure cavity;Two oil ports are provided on pump body, one oil port is communicated with oil suction cavity and forms pump body oil suction port, another oil port is communicated with oil pressure cavity and forms pump body oil outlet port;Two oil ports are provided on pump cover, one oil port is communicated with oil suction cavity and forms pump cover oil suction port, another oil port is communicated with oil pressure cavity and forms pump cover oil outlet port;One oil suction port in pump body oil suction port and pump cover oil suction port is provided with detachable oil suction sealing plug;One oil outlet port in pump body oil outlet port and pump cover oil outlet port is provided with detachable oil outlet sealing plug.In the utility model discloses a kind of marine cycloidal gear pump, including two oil suction ports, one is pump body oil suction port arranged on pump body, another is pump cover oil suction port arranged on pump cover;It further includes two oil outlets, one is pump body oil outlet port arranged on pump body, another is pump cover oil outlet port arranged on pump cover;And one oil suction port in pump body oil suction port and pump cover oil suction port is provided with detachable oil suction sealing plug, one oil outlet port in pump body oil outlet port and pump cover oil outlet port is provided with detachable oil outlet sealing plug;So, in actual application process, one of pump body oil suction port and pump cover oil suction port can be selected as the oil suction port of oil pump according to actual arrangement needs, and the other is sealed using oil suction sealing plug;Similarly, one of pump body oil outlet port and pump cover oil outlet port can be selected as the oil outlet port of oil pump according to actual arrangement needs, and the other is sealed using oil outlet sealing plug, so that the position of inlet and outlet can be selected according to actual arrangement needs, so that external inlet and outlet pipeline arrangement can be facilitated, and the installation adaptability of the marine cycloidal gear pump of the utility model can be effectively improved.

[0007] Preferably, the pump body oil suction port and the pump body oil outlet port each include a threaded interface, the pump cover oil suction port and the pump cover oil outlet port each include a threaded interface, the oil suction sealing plug is connected with the threaded interface of the pump body oil suction port or the pump cover oil suction port by screwing, and the oil outlet sealing plug is connected with the threaded interface of the pump body oil outlet port or the pump cover oil outlet port by screwing.In this way, the oil suction sealing plug and the oil outlet sealing plug can be conveniently installed or removed, so that the position of inlet and outlet can be selected according to actual arrangement needs, and meanwhile, the connection between the external inlet and outlet pipeline and the threaded interface can be facilitated.

[0008] Preferably, the pump body oil suction port further includes a pump body oil suction channel connecting the oil suction cavity and the threaded interface of the pump body oil suction port, the pump body oil outlet port further includes a pump body oil outlet channel connecting the oil pressure cavity and the threaded interface of the pump body oil outlet port, the pump cover oil suction port further includes a pump cover oil suction channel connecting the oil suction cavity and the threaded interface of the pump cover oil suction port, and the pump cover oil outlet port further includes a pump cover oil outlet channel connecting the oil pressure cavity and the threaded interface of the pump cover oil outlet port.In this way, the actual machining and manufacturing of the pump body oil suction port and the pump body oil outlet port are facilitated, and the actual machining and manufacturing of the pump cover oil suction port and the pump cover oil outlet port are facilitated.

[0009] As preferred, the inner rotor and the outer rotor are intermeshed, the pump body and the pump cover form a pump body cavity, the inner rotor is arranged in the pump body cavity through the transmission shaft, and the outer rotor is located in the pump body cavity; the threaded interfaces of the pump cover oil suction port and the pump cover oil outlet port extend along the radial direction of the transmission shaft and are communicated with the side wall of the pump cover. Since the thickness of the pump cover in the axial direction of the transmission shaft is small (the thickness of the pump body of the current marine cycloidal gear pump in the axial direction of the transmission shaft is greater than the thickness of the pump cover in the axial direction of the transmission shaft), the threaded interfaces of the pump cover oil suction port and the pump cover oil outlet port extend along the radial direction of the transmission shaft and are communicated with the side wall of the pump cover, so that the pump cover oil suction port and the pump cover oil outlet port are facilitated to be manufactured, and the threaded interfaces of the pump cover oil suction port and the pump cover oil outlet port have sufficient axial length, so that the oil suction sealing plug can be reliably connected with the threaded interface of the pump cover oil suction port, and the oil outlet sealing plug can be reliably connected with the threaded interface of the pump cover oil outlet port.

[0010] As preferred, the threaded interfaces of the pump body oil suction port and the pump body oil outlet port extend along the axial direction of the transmission shaft and are communicated with the end face of the pump body. Since the thickness of the pump body in the axial direction of the transmission shaft is large, the threaded interfaces of the pump body oil suction port and the pump body oil outlet port extend along the axial direction of the transmission shaft and are communicated with the end face of the pump body, so that the pump body oil suction port and the pump body oil outlet port are facilitated to be actually manufactured.

[0011] As preferred, the threaded interfaces of the pump cover oil suction port and the pump cover oil outlet port are symmetrically distributed on both sides of the transmission shaft, and the threaded interfaces of the pump body oil suction port and the pump body oil outlet port are symmetrically distributed on both sides of the transmission shaft.

[0012] As preferred, the inner rotor is provided with a shaft hole in the middle part, the transmission shaft passes through the shaft hole, and the transmission shaft and the inner rotor are connected through a key, a gap between the pump body bearing and the inner rotor forms a second annular oil groove, and a gap between the shaft hole and the transmission shaft connects the first annular oil groove and the second annular oil groove. In this way, in the process of rotating the inner rotor and the outer rotor by the transmission shaft of the marine cycloidal gear pump, the oil in the first annular oil groove will enter the second annular oil groove through the gap between the shaft hole and the transmission shaft, and the oil in the second annular oil groove enters the transmission shaft and the pump body bearing to lubricate the pump body bearing; thereby automatically lubricating the bearing between the transmission shaft and the pump body during the operation of the marine cycloidal gear pump, further improving the lubrication performance of the transmission shaft, and further improving the transmission stability, service life, working efficiency, etc. of the marine cycloidal gear pump.

[0013] As preferred, the inner rotor is provided with a shaft hole in the middle part, the transmission shaft passes through the shaft hole, and the transmission shaft and the inner rotor are connected through a key, a gap between the pump body bearing and the inner rotor forms a second annular oil groove, and a gap between the shaft hole and the transmission shaft connects the first annular oil groove and the second annular oil groove. In this way, in the process of rotating the inner rotor and the outer rotor by the transmission shaft of the marine cycloidal gear pump, the oil in the first annular oil groove will enter the second annular oil groove through the gap between the shaft hole and the transmission shaft, and the oil in the second annular oil groove enters the transmission shaft and the pump body bearing to lubricate the pump body bearing; thereby automatically lubricating the bearing between the transmission shaft and the pump body during the operation of the marine cycloidal gear pump, further improving the lubrication performance of the transmission shaft, and further improving the transmission stability, service life, working efficiency, etc. of the marine cycloidal gear pump.

[0014] As preferred, the inner rotor is provided with a shaft hole in the middle part, the transmission shaft passes through the shaft hole, and the transmission shaft and the inner rotor are connected through a key, a gap between the pump body bearing and the inner rotor forms a second annular oil groove, and a gap between the shaft hole and the transmission shaft connects the first annular oil groove and the second annular oil groove. In this way, in the process of rotating the inner rotor and the outer rotor by the transmission shaft of the marine cycloidal gear pump, the oil in the first annular oil groove will enter the second annular oil groove through the gap between the shaft hole and the transmission shaft, and the oil in the second annular oil groove enters the transmission shaft and the pump body bearing to lubricate the pump body bearing; thereby automatically lubricating the bearing between the transmission shaft and the pump body during the operation of the marine cycloidal gear pump, further improving the lubrication performance of the transmission shaft, and further improving the transmission stability, service life, working efficiency, etc. of the marine cycloidal gear pump.

[0015] The pump body and the pump cover are connected by bolts, and a pin hole positioning structure is arranged between the pump body and the pump cover, the pin hole positioning structure comprises a positioning pin, a pump body pin hole arranged on the pump body and a pump cover pin hole arranged on the pump cover, the pump body pin hole and the pump cover pin hole are in one-to-one correspondence, and the positioning pin is inserted into the pump body pin hole and the corresponding pump cover pin hole.

[0016] The utility model discloses the beneficial effects are:

[0017] First, the position of the oil inlet and outlet can be selected according to actual arrangement needs, so as to facilitate external oil inlet and outlet pipeline arrangement, thereby improving the installation adaptability of the pump.

[0018] Second, the lubricating performance of the transmission shaft can be improved, and the transmission stability, service life and working efficiency of the marine cycloidal gear pump are improved. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a kind of cross section structure schematic diagram of a kind of marine cycloidal gear pump of the utility model.

[0020] Figure 2 It is a kind of structure schematic diagram of a kind of marine cycloidal gear pump of the utility model.

[0021] Figure 3 It is Figure 1 The local enlarged view of A in Fig.

[0022] In the figure:

[0023] Pump body 1;

[0024] Pump cover 2;

[0025] Inner rotor 3;

[0026] Outer rotor 4;

[0027] Transmission shaft 5, axial through hole 5.1;

[0028] Threaded interface 6;

[0029] Pump body oil suction port 7, pump body oil suction channel 7.1;

[0030] Pump body oil outlet 8, pump body oil outlet 8.1;

[0031] Pump cover oil suction port 9, pump cover oil suction channel 9.1;

[0032] Pump cover oil outlet 10, pump cover oil outlet 10.1;

[0033] Oil suction sealing plug 11;

[0034] Oil outlet sealing plug 12;

[0035] Pump cover bearing 13;

[0036] pump body bearing 14;

[0037] end face cavity 15;

[0038] first annular oil groove 16;

[0039] oil inlet lubrication groove 17;

[0040] oil suction cavity 18;

[0041] oil pressure cavity 19. DETAILED DESCRIPTION

[0042] In one embodiment, as shown in Figure 1 , Figure 2 a marine cycloidal gear pump includes a pump body 1, a pump cover 2, an oil suction cavity 18 and an oil pressure cavity 19, and an inner rotor 3 and an outer rotor 4 that mesh with each other. The pump body 1 and the pump cover 2 form a pump body inner cavity. The inner rotor 3 is arranged in the pump body inner cavity through a transmission shaft 5. The outer rotor 4 is located in the pump body inner cavity.

[0043] The pump body 1 is provided with two oil ports, one of which communicates with the oil suction cavity 18 to form a pump body oil suction port 7, and the other of which communicates with the oil pressure cavity 19 to form a pump body oil outlet port 8. The pump cover 2 is provided with two oil ports, one of which communicates with the oil suction cavity 18 to form a pump cover oil suction port 9, and the other of which communicates with the oil pressure cavity 19 to form a pump cover oil outlet port 10. One of the pump body oil suction port 7 and the pump cover oil suction port 9 is provided with a detachable oil suction sealing plug 11. One of the pump body oil outlet port 8 and the pump cover oil outlet port 10 is provided with a detachable oil outlet sealing plug 12.

[0044] In operation, the transmission shaft 5 of the marine cycloidal gear pump drives the inner rotor 3 and the outer rotor 4 to rotate. The teeth of the inner rotor 3 and the outer rotor 4 that mesh in the oil suction cavity 18 gradually disengage to increase the sealing volume, forming a local vacuum. Oil enters the oil suction cavity 18 under the action of atmospheric pressure. The inner rotor 3 and the outer rotor 4 successively mesh and rotate, and oil is carried into the oil pressure cavity 19. At the same time, the gap between the teeth of the inner rotor 3 and the outer rotor 4 that mesh gradually narrows with rotation, and the oil pressure rises, so that the oil carried from the oil suction cavity 18 to the oil pressure cavity 19 is discharged from the oil outlet port to the outside of the pump.

[0045] In the marine cycloid gear pump of the embodiment, two oil suction ports are included, one of which is a pump body oil suction port 7 arranged on the pump body 1, and the other is a pump cover oil suction port 9 arranged on the pump cover 2; two oil discharge ports are also included, one of which is a pump body oil discharge port 8 arranged on the pump body 1, and the other is a pump cover oil discharge port 10 arranged on the pump cover 2; and one of the pump body oil suction port 7 and the pump cover oil suction port 9 is provided with a detachable oil suction sealing plug 11, and one of the pump body oil discharge port 8 and the pump cover oil discharge port 10 is provided with a detachable oil discharge sealing plug 12. In this way, in actual application, one of the pump body oil suction port 7 and the pump cover oil suction port 9 can be selected as the oil suction port of the oil pump according to actual arrangement needs, and the other is sealed by the oil suction sealing plug 11; similarly, one of the pump body oil discharge port 8 and the pump cover oil discharge port 10 can be selected as the oil discharge port of the oil pump according to actual arrangement needs, and the other is sealed by the oil discharge sealing plug 12, so that the positions of the oil inlet and outlet ports can be selected according to actual arrangement needs, so as to facilitate the external oil inlet and outlet pipeline arrangement, and the installation adaptability of the marine cycloid gear pump of the scheme can be effectively improved.

[0046] Specific embodiment two, as shown in Figure 1 、 Figure 2 A marine cycloid gear pump includes a pump body 1, a pump cover 2, an oil suction chamber 18 and an oil pressure chamber 19, and an inner rotor 3 and an outer rotor 4 that mesh with each other. The pump body 1 and the pump cover 2 are connected by bolts. A sealing ring is arranged between the pump body 1 and the pump cover 2. The pump body 1 and the pump cover 2 form a pump body inner cavity. The inner rotor 3 is arranged in the pump body inner cavity through a transmission shaft 5. The outer rotor 4 is located in the pump body inner cavity.

[0047] Two oil ports are arranged on the pump body 1, one of which is in communication with the oil suction chamber 18 to form a pump body oil suction port 7, and the other is in communication with the oil pressure chamber 19 to form a pump body oil discharge port 8. Two oil ports are arranged on the pump cover 2, one of which is in communication with the oil suction chamber 18 to form a pump cover oil suction port 9, and the other is in communication with the oil pressure chamber 19 to form a pump cover oil discharge port 10. One of the pump body oil suction port 7 and the pump cover oil suction port 9 is provided with a detachable oil suction sealing plug 11. One of the pump body oil discharge port 8 and the pump cover oil discharge port 10 is provided with a detachable oil discharge sealing plug 12.

[0048] In specific operation, the transmission shaft 5 of the marine cycloid gear pump drives the inner rotor 3 and the outer rotor 4 to rotate. The meshing teeth of the inner rotor 3 and the outer rotor 4 in the oil suction chamber 18 gradually disengage to increase the sealing volume, forming a local vacuum. Oil enters the oil suction chamber 18 under the action of atmospheric pressure. The inner rotor 3 and the outer rotor 4 successively mesh and rotate, and oil is carried into the oil pressure chamber 19. At the same time, the meshing gap between the inner rotor 3 and the outer rotor 4 gradually narrows with rotation, and the oil pressure rises, so that the oil carried from the oil suction chamber 18 to the oil pressure chamber 19 is discharged from the oil discharge port to the outside of the pump.

[0049] One of the two oil suction ports is the pump body oil suction port 7 arranged on the pump body 1, and the other is the pump cover oil suction port 9 arranged on the pump cover 2. The two oil outlet ports are also included, one of which is the pump body oil outlet port 8 arranged on the pump body 1, and the other is the pump cover oil outlet port 10 arranged on the pump cover 2. One of the pump body oil suction port 7 and the pump cover oil suction port 9 is provided with a detachable oil suction sealing plug 11, and one of the pump body oil outlet port 8 and the pump cover oil outlet port 10 is provided with a detachable oil outlet sealing plug 12. In actual application, one of the pump body oil suction port 7 and the pump cover oil suction port 9 can be selected as the oil suction port of the oil pump according to the actual arrangement, and the other is sealed with the oil suction sealing plug 11. Similarly, one of the pump body oil outlet port 8 and the pump cover oil outlet port 10 can be selected as the oil outlet port of the oil pump according to the actual arrangement, and the other is sealed with the oil outlet sealing plug 12. Therefore, the positions of the oil inlet and outlet ports can be selected according to the actual arrangement, so as to facilitate the external oil inlet and outlet pipeline arrangement, and the installation adaptability of the marine cycloidal gear pump of the scheme can be effectively improved.

[0050] Specifically, as shown in Figure 1 、 Figure 2 , the pin hole positioning structure is arranged between the pump body 1 and the pump cover 2. The pin hole positioning structure includes positioning pins, pump body 1 pin holes arranged on the pump body 1, and pump cover 2 pin holes arranged on the pump cover 2. The pump body 1 pin holes and the pump cover 2 pin holes are one-to-one corresponding. The positioning pins are one-to-one corresponding to the pump body 1 pin holes. In this embodiment, the pump body 1 pin holes are 2-4. The positioning pins are inserted into the pump body 1 pin holes and the corresponding pump cover 2 pin holes.

[0051] In this embodiment, as shown in Figure 1 、 Figure 2 , the threaded interfaces 6 of the pump cover oil suction port 9 and the pump cover oil outlet port 10 are symmetrically distributed on both sides of the transmission shaft 5. The threaded interfaces 6 of the pump body oil suction port 7 and the pump body oil outlet port 8 are symmetrically distributed on both sides of the transmission shaft 5.

[0052] Of course, it should be noted that the threaded interfaces 6 of the pump cover oil suction port 9 and the pump cover oil outlet port 10 are symmetrically distributed on both sides of the transmission shaft 5; the threaded interfaces 6 of the pump body oil suction port 7 and the pump body oil outlet port 8 are symmetrically distributed on both sides of the transmission shaft 5 - this is only a preferred scheme of this embodiment. In the actual production process, the threaded interfaces 6 of the pump cover oil suction port 9 and the pump cover oil outlet port 10 can also be asymmetrically distributed; the threaded interfaces 6 of the pump body oil suction port 7 and the pump body oil outlet port 8 can also be asymmetrically distributed.

[0053] Further, as shown in Figure 1As shown, the pump body oil suction port 7 and the pump body oil outlet port 8 both include threaded interfaces 6. The pump cover oil suction port 9 and the pump cover oil outlet port 10 both include threaded interfaces 6. The oil suction sealing plug 11 is connected with the threaded interface 6 of the pump body oil suction port 7 or the pump cover oil suction port 9 through threads. The oil outlet sealing plug 12 is connected with the threaded interface 6 of the pump body oil outlet port 8 or the pump cover oil outlet port 10 through threads. In this way, the oil suction sealing plug 11 and the oil outlet sealing plug 12 can be conveniently installed or removed, so as to select the positions of the oil inlet and outlet ports according to the actual arrangement needs; meanwhile, the connection of the external oil inlet and outlet pipelines with the threaded interfaces 6 can be facilitated.

[0054] Further, as shown in the figure, Figure 1 The pump body oil suction port 7 further includes a pump body oil suction channel 7.1, which connects the oil suction chamber 18 and the threaded interface 6 of the pump body oil suction port 7. The pump body oil outlet port 8 further includes a pump body oil outlet channel 8.1, which connects the oil pressure chamber 19 and the threaded interface 6 of the pump body oil outlet port 8. The pump cover oil suction port 9 further includes a pump cover oil suction channel 9.1, which connects the oil suction chamber 18 and the threaded interface 6 of the pump cover oil suction port 9. The pump cover oil outlet port 10 further includes a pump cover oil outlet channel 10.1, which connects the oil pressure chamber 19 and the threaded interface 6 of the pump cover oil outlet port 10. In this way, the actual machining and manufacturing of the pump body oil suction port 7 and the pump body oil outlet port 8 are facilitated, and the actual machining and manufacturing of the pump cover oil suction port 9 and the pump cover oil outlet port 10 are facilitated.

[0055] Further, as shown in the figure, Figure 1 The threaded interfaces 6 of the pump cover oil suction port 9 and the pump cover oil outlet port 10 both extend along the radial direction of the transmission shaft 5 and communicate with the side wall of the pump cover 2. Since the thickness of the pump cover 2 in the axial direction of the transmission shaft 5 is small (the thickness of the pump body 1 of the current marine cycloidal gear pump in the axial direction of the transmission shaft 5 is greater than the thickness of the pump cover 2 in the axial direction of the transmission shaft 5), the threaded interfaces 6 of the pump cover oil suction port 9 and the pump cover oil outlet port 10 both extend along the radial direction of the transmission shaft 5 and communicate with the side wall of the pump cover 2 in the present embodiment. In this way, the manufacturing of the pump cover oil suction port 9 and the pump cover oil outlet port 10 is facilitated, and the threaded interfaces 6 of the pump cover oil suction port 9 and the pump cover oil outlet port 10 have sufficient axial length, so that the oil suction sealing plug 11 can be reliably connected with the threaded interface 6 of the pump cover oil suction port 9, and the oil outlet sealing plug 12 can be reliably connected with the threaded interface 6 of the pump cover oil outlet port 10.

[0056] Further, as shown in the figure, Figure 1 The threaded interfaces 6 of the pump body oil suction port 7 and the pump body oil outlet port 8 both extend along the axial direction of the transmission shaft 5 and communicate with the end face of the pump body 1. Since the thickness of the pump body 1 in the axial direction of the transmission shaft 5 is large, the threaded interfaces 6 of the pump body oil suction port 7 and the pump body oil outlet port 8 both extend along the axial direction of the transmission shaft 5 and communicate with the end face of the pump body 1 in the present solution, so as to facilitate the actual machining and manufacturing of the pump body oil suction port 7 and the pump body oil outlet port 8.

[0057] In this specific embodiment, the remaining structure is the same as in specific embodiment one or specific embodiment two, except that...

[0058] like Figure 1 As shown in Figure 3, a pump body bearing 14 is provided between the drive shaft 5 and the pump body 1. A pump cover bearing 13 is provided between the drive shaft 5 and the pump cover 2. The gap between the pump cover bearing 13 and the inner rotor 3 forms a first annular oil groove 16. An oil inlet lubrication groove 17 is provided between one end face of the inner rotor 3 and the inner wall of the pump body cavity. The oil inlet lubrication groove 17 connects the oil pressure chamber 19 and the first annular oil groove 16. In this embodiment, an inner wall oil groove is provided on the inner wall of the pump body cavity facing one end face of the inner rotor 3. This inner wall oil groove is provided on the pump cover 2 or the pump body 1. This inner wall oil groove constitutes the oil inlet lubrication groove 17. During the operation of the marine cycloidal gear pump, when the oil flows through the pressure chamber 19, a small amount of oil will enter the first annular oil groove 16 through the oil inlet lubrication groove 17. The oil in the first annular oil groove 16 enters the drive shaft 5 and the pump cover bearing 13 to lubricate the pump cover bearing 13. This achieves automatic lubrication of the bearing between the drive shaft 5 and the pump cover 2 during the operation of the marine cycloidal gear pump, improving the lubrication performance of the drive shaft 5, and thus improving the transmission smoothness, service life, and working efficiency of the marine cycloidal gear pump.

[0059] Furthermore, the inner rotor 3 has a shaft hole in the middle. The drive shaft 5 passes through the shaft hole and is connected to the inner rotor 3 by a key. The gap between the pump body bearing 14 and the inner rotor 3 forms a second annular oil groove. The gap between the shaft hole and the drive shaft 5 connects the first annular oil groove 16 and the second annular oil groove. Thus, during the rotation of the inner rotor 3 and the outer rotor 4 driven by the drive shaft 5 of the marine cycloidal gear pump, the oil in the first annular oil groove 16 will enter the second annular oil groove through the gap between the shaft hole and the drive shaft 5. The oil in the second annular oil groove will then enter the drive shaft 5 and the pump body bearing 14, lubricating the pump body bearing 14. This achieves automatic lubrication of the bearing between the drive shaft 5 and the pump body 1 during the operation of the marine cycloidal gear pump, further improving the lubrication performance of the drive shaft 5, and thus improving the transmission smoothness, service life, and working efficiency of the marine cycloidal gear pump.

[0060] Further, the transmission shaft 5 is provided with an axial through hole 5.1, the axial through hole 5.1 penetrates two ends of the transmission shaft 5. The pump cover 2 and the end surface of the transmission shaft 5 are provided with an end surface cavity 15, the axial through hole 5.1 is communicated with the end surface cavity. Thus, in the working process of the marine cycloidal gear pump, the oil in the first annular oil groove 16 enters between the pump shaft and the pump cover bearing 13, lubricates the pump cover bearing 13, and then enters the end surface cavity, and then the oil returns to the gear box through the axial through hole 5.1, forming the circulation of the lubricating oil, which is beneficial to the continuous entry of the oil between the pump shaft and the pump cover bearing 13, lubricates the pump cover bearing 13, and ensures the lubricating effect of the pump cover bearing 13.

[0061] The above is only a preferred embodiment of the present application, and does not limit the present application. Any simple modification, change and equivalent transformation of the above embodiment according to the technical essence of the present application still belongs to the protection scope of the technical scheme of the present application.

Claims

1. A marine cycloidal gear pump, characterized by, The pump comprises a pump body, a pump cover, an oil suction cavity and an oil pressure cavity.

2. A marine cycloidal gear pump according to claim 1, characterised in that The pump body oil suction port and the pump body oil outlet port are both extended along the axial direction of the transmission shaft and are communicated with the end surface of the pump body.

3. A marine cycloidal gear pump according to claim 2, characterised in that The pump cover oil suction port and the pump cover oil outlet port are symmetrically distributed on both sides of the transmission shaft. The pump body oil suction port and the pump body oil outlet port are symmetrically distributed on both sides of the transmission shaft.

4. A marine trochoidal gear pump according to claim 2 or 3, characterised in that The pump body and the pump cover are connected through bolts, and a pin hole positioning structure is arranged between the pump body and the pump cover.

5. A marine cycloidal gear pump according to claim 4, characterised in that The pin hole positioning structure comprises a positioning pin, a pump body pin hole arranged on the pump body and a pump cover pin hole arranged on the pump cover.

6. A marine cycloidal gear pump according to claim 5, characterised in that The pump body pin hole and the pump cover pin hole are one-to-one corresponding, and the positioning pin is inserted into the pump body pin hole and the corresponding pump cover pin hole.

7. A marine trochoidal gear pump according to claim 1 or 2 or 3, characterised in that, ​ 8. A marine cycloidal gear pump according to claim 7, characterised in that ​ 9. A marine cycloidal gear pump according to claim 8, characterised in that ​ 10. A marine trochoidal gear pump according to claim 1 or 2 or 3, characterized in that ​

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