Internal gearing low-noise oil feed pump

Abstract

The invention relates to the technical field of oil feed pump devices, in particular to an inner gearing low-noise oil feed pump which can effectively solve the problem that in the prior art, large noise is caused by the cavitation phenomenon caused by the oil trapping problem. Comprising an oil pump body, an outer rotor, an inner rotor, a guide wheel seat and a transmission shaft, the outer rotor and the inner rotor are movably embedded in the oil cavity, inner teeth are evenly distributed on the circumference of the inner side of the outer rotor, outer teeth are evenly distributed on the circumference of the outer side of the inner rotor, the inner teeth and the outer teeth are both in a curve pattern combining an arc curve and a cycloid tooth profile curve, the outer rotor and the inner rotor are not coaxial, and the outer teeth and the inner teeth are embedded in a transmission mode. The guide wheel seat comprises a seat body and a shaft body, the seat body is fixedly attached to the oil pump body to seal the oil cavity, and the transmission shaft sequentially penetrates through the inner rotor and the mounting hole; the transmission shaft is sleeved on the shaft body, the shaft body is in running fit with the mounting hole, and the end part close to one end of the seat body is connected with the inner rotor.

Description

Technical Field

[0001] The invention relates to the technical field of oil supply pump devices, in particular to an internal meshing low-noise oil supply pump. Background Art

[0002] The oil supply pump is an important component on the vehicle and is widely used in hydraulic systems. For example, the Chinese patent authorization announcement number CN210397083U, the authorization announcement date is 2020.04.24, and the patent named "A kind of oil supply pump for large-tonnage forklift gearbox" discloses a oil supply pump for large-tonnage forklift gearbox, including a mounting seat and a pump body, one side outer surface of the mounting seat is provided with a No. 1 bolt and a No. 2 bolt, the No. 2 bolt is located at the lower end of the No. 1 bolt, one side outer surface of the mounting seat is fixedly installed with a cushion layer, the other side middle outer surface of the mounting seat is fixedly connected with an oil pipeline, the middle outer surface of the cushion layer is provided with a sealing ring, the outer surface of one side of the cushion layer is provided with a mounting plate, the outer surface of one side of the mounting plate is fixedly installed with a pump body, the outer surface of the mounting plate is provided with a No. 1 reserved hole and a No. 2 reserved hole, the No. 2 reserved hole is located at the lower end of the No. 1 reserved hole, and the middle of the pump body is provided with a torque converter.

[0003] However, when this type of oil pump is working, oil is mainly supplied through a pair of internally meshing involute gears. Since oil is inevitably trapped when the involute gears run at high speeds, the high-pressure oil inside is prone to pulsation and cavitation, which in turn causes greater noise. Summary of the invention

[0004] The purpose of the present invention is to propose an internal meshing low-noise oil supply pump, which can effectively solve the cavitation phenomenon caused by oil entrapment in the prior art, thereby causing the problem of high noise.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] An internal meshing low-noise oil supply pump comprises an oil pump body, an outer rotor, an inner rotor, a guide wheel seat and a transmission shaft, the oil pump body being provided with an oil chamber, an oil inlet channel, an oil outlet channel and a mounting hole; the outer rotor and the inner rotor are movably embedded in the oil chamber, the inner circumference of the outer rotor is evenly provided with inner teeth, the outer circumference of the inner rotor is evenly provided with outer teeth, the inner teeth and the outer teeth are both curve styles combining circular arc curves and cycloid tooth profile curves, the outer rotor and the inner rotor are not coaxial, and the outer teeth are transmission-engaged with the inner teeth; the guide wheel seat comprises a seat body and a shaft body, the seat body is fixedly fitted to the oil pump body to close the oil chamber, and the transmission shaft passes through the inner rotor and the mounting hole in sequence; the transmission shaft is sleeved on the shaft body, the shaft body is rotationally matched with the mounting hole, and the end portion close to one end of the seat body is connected to the inner rotor.

[0007] On the basis of the above scheme and as a preferred scheme of the above scheme: the outer rotor and the inner rotor are both made of iron-based copper-nickel powder alloy.

[0008] On the basis of the above scheme and as a preferred scheme of the above scheme: a plurality of through holes are arranged on the seat body, threaded holes corresponding to the through holes are arranged on the oil pump body, and screws are arranged to pass through the through holes and threadedly connected with the threaded holes to fix the guide wheel seat to the oil pump body.

[0009] On the basis of the above scheme and as a preferred scheme of the above scheme: the position where the oil outlet channel connects to the oil chamber is set on the side of the engagement direction of the external teeth and the internal teeth, and the position where the oil inlet channel connects to the oil chamber is set on the side away from the engagement direction of the external teeth and the internal teeth.

[0010] On the basis of the above scheme and as a preferred scheme of the above scheme: a sealing ring is provided on the outer peripheral side of the oil pump body.

[0011] On the basis of the above scheme and as a preferred scheme of the above scheme: a raised convex portion is provided on the inner side of the inner rotor, an embedding groove is provided on the end of the transmission shaft close to one end of the inner rotor, and the end of the transmission shaft is inserted into the inner side of the inner rotor and the convex portion is embedded in the embedding groove.

[0012] On the basis of the above scheme and as a preferred scheme of the above scheme: a first mounting groove is provided at one end of the mounting hole close to the oil chamber direction, and a second mounting groove is provided at the other end; a support bearing is provided in the first mounting groove, the outer ring of the support bearing is tightly fitted with the first mounting groove, and the inner ring of the support bearing is in rotational contact with the transmission shaft; an oil seal is provided in the second mounting groove, the outer ring of the oil seal is tightly fitted with the second mounting groove, and the inner ring of the oil seal is in rotational contact with the transmission shaft.

[0013] In order to effectively solve the cavitation phenomenon caused by oil entrapment in the prior art, which in turn causes the problem of high noise, the present invention has the following advantages:

[0014] The present invention drives the inner rotor and the outer rotor to circulate in the oil chamber through the transmission shaft, and the lubricating liquid is pumped from the oil inlet channel to the oil outlet channel due to the continuous change of the oil storage space between the outer teeth and the inner teeth caused by the meshing relationship between the outer rotor and the inner rotor during the rotation process.

[0015] During the process, the lubricating liquid in the oil chamber can achieve self-lubrication of the inner rotor and the outer rotor. At the same time, when the inner rotor structure comes into contact with the outer rotor structure, the rotor structure that combines circular arcs and cycloids adopted by the continuously meshing external teeth and internal teeth and the specially designed oil groove can ensure the rated operating efficiency while reducing the oil pump noise. In addition, the inner and outer rotors of the oil pump are made of iron-based copper-nickel powder alloy, which absorbs sound and reduces noise, thus achieving a dual noise reduction function.

[0016] In addition to the above-described objects, features and advantages, the present invention has other objects, features and advantages. The present invention will be further described in detail with reference to the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the internal meshing low noise oil supply pump of the present invention;

[0018] Figure 2 It is a cross-sectional view of the internal meshing low noise oil supply pump of the present invention;

[0019] Figure 3 It is a schematic diagram of the assembly and disassembly of the internal meshing low noise oil supply pump of the present invention;

[0020] Figure 4 It is an exploded schematic diagram of the assembly relationship between the inner rotor and the transmission shaft of the present invention;

[0021] Figure 5 It is a schematic diagram of the assembly between the inner rotor, the outer rotor and the oil pump body of the present invention;

[0022] Figure 6 The figure is a schematic diagram of the arrangement of the oil inlet channel and the oil outlet channel of the oil pump body of the present invention. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present invention are described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0024] See also Figure 1-6 The present invention discloses an internal meshing low noise oil supply pump, comprising an oil pump body 100, an outer rotor 200, an inner rotor 300, a guide wheel seat 400 and a transmission shaft 500. Figure 6 As shown, the oil pump body 100 is provided with an oil chamber 101, an oil inlet channel 102, an oil outlet channel 103 and a mounting hole 104; Figure 5 As shown, the outer rotor 200 and the inner rotor 300 are movably embedded in the oil chamber 101. The inner circumference of the outer rotor 200 is evenly distributed with inner teeth 201, and the outer circumference of the inner rotor 300 is evenly distributed with outer teeth 301. The inner teeth 201 and the outer teeth 301 are both curve styles combining circular arc curves and cycloid tooth profile curves, such as Figure 4 and Figure 5 As shown, the tooth grooves of the inner teeth 201 and the tooth tops of the outer teeth 301 adopt a cycloidal tooth profile curve structure, the tooth grooves of the outer teeth 301 and the tooth tops of the inner teeth 201 adopt an arc curve structure, and the outer rotor 200 and the inner rotor 300 adopt an eccentric corresponding structure of different axes when assembling, so that the outer teeth 301 and the inner teeth 201 are transmission-engaged; as shown Figure 2 As shown, the guide wheel seat 400 includes a seat body 401 and a shaft body 403, the seat body 401 and the shaft body 403 are integrated, the shaft body 403 is a hollow shaft structure, the seat body 401 is fixedly fitted to the oil pump body 100 to close the oil chamber 101, and the transmission shaft 500 passes through the inner rotor 300 and the mounting hole 104 in sequence; the transmission shaft 500 is sleeved on the shaft body 403, the shaft body 403 is rotatably matched with the mounting hole 104, and the end close to one end of the seat body 401 is connected to the inner rotor 300.

[0025] Among them, the outer contour of the outer rotor 200 is a perfect circular structure, and the inner contour of the oil chamber 101 that accommodates the outer rotor 200 is also a perfect circular structure. The outer contour of the outer rotor 200 and the inner contour of the oil chamber 101 are flexibly matched. The transmission shaft 500 rotates to drive the inner rotor 300 to rotate. Due to the interlocking relationship between the inner teeth 201 and the outer teeth 301, the outer rotor 200 is driven to rotate synchronously, thereby realizing the continuous change of the oil storage space between the outer teeth 301 and the inner teeth 201.

[0026] The outer rotor 200 and the inner rotor 300 are both made of iron-based copper-nickel powder alloy.

[0027] In the present invention, the transmission shaft 500 drives the inner rotor 300 and the outer rotor 200 to circulate in the oil chamber 101. The lubricating liquid is pumped from the oil inlet channel 102 to the oil outlet channel 103 due to the continuous change of the oil storage space between the outer teeth 301 and the inner teeth 201 caused by the meshing relationship between the outer rotor 200 and the inner rotor 300 during the rotation.

[0028] It is worth noting that Figure 5 and Figure 6As shown, the oil inlet channel 102 and the oil outlet channel 103 are both connected to the oil chamber 101 from the side of the oil chamber 101 away from the seat body 401 (the end face facing the area of ​​the outer rotor 200 and the inner rotor 300), and the connecting openings of the oil inlet channel 102 and the oil outlet channel 103 connecting to the oil chamber 101 are in the shape of an arc larger than one-third of a full circle but smaller than one-half of a full circle, and the connecting openings of the oil inlet channel 102 and the oil outlet channel 103 at one end away from the oil chamber 101 are outside the outer peripheral side of the seat body 401. The width of the connecting port of the oil inlet channel 102 and the oil outlet channel 103 at one end away from the oil chamber 101, and the overall width of the connecting channel portion between the connecting port (at one end away from the oil chamber 101) and the connecting port at the other end (at one end close to the oil chamber 101) are greater than the width of the connecting port at the oil chamber 101, and are greater than twice the width when the depth is the same to ensure smooth oil circulation. While ensuring the pumping efficiency, it further prevents pump blocking, reduces pump usage loss, and reduces noise generation.

[0029] During the process, the lubricating liquid in the oil chamber 101 can realize self-lubrication of the inner rotor 300 and the outer rotor 200. At the same time, when the inner rotor 300 structure contacts the outer rotor 200 structure, the rotor structure that combines arcs and cycloids adopted by the continuously meshing outer teeth 301 and the inner teeth 201 and the specially designed oil groove can ensure the rated operating efficiency while reducing the oil pump noise. In addition, the inner and outer rotors 200 of the oil pump are made of iron-based copper-nickel powder alloy to absorb sound and reduce noise, thereby achieving a dual noise reduction function.

[0030] Furthermore, a plurality of through holes 402 are provided on the seat body 401, threaded holes 107 corresponding to the through holes 402 are provided on the oil pump body 100, and screws 600 are provided to pass through the through holes 402 and be threadedly connected to the threaded holes 107 to fix the guide wheel seat 400 to the oil pump body 100.

[0031] Furthermore, if Figure 6 As shown, in order to ensure the pumping capacity of the internal meshing low noise oil supply pump of the present invention for the lubricating liquid, the position of the oil outlet channel 103 connecting to the oil chamber 101 is set on the side of the engagement direction of the external teeth 301 and the internal teeth 201, and the position of the oil inlet channel 102 connecting to the oil chamber 101 is set on the side away from the engagement direction of the external teeth 301 and the internal teeth 201.

[0032] Furthermore, a sealing ring 700 is provided on the outer peripheral side of the oil pump body 100 .

[0033] Further, in order to facilitate the installation of the transmission shaft 500 in the subsequent assembly, as Figure 4As shown, the inner side of the inner rotor 300 is a perfect circle, and a raised convex portion 302 is provided on the inner side of the inner rotor 300. The end of the transmission shaft 500 close to the direction end of the inner rotor 300 is a perfect circle structure that can be embedded in the inner side of the inner rotor 300. The end of the transmission shaft 500 close to one end of the inner rotor 300 is provided with an embedding groove 501. The embedding groove 501 is an unclosed U-shaped groove close to the direction end of the inner rotor 300. The end of the transmission shaft 500 is inserted into the inner side of the inner rotor 300 and the convex portion 302 is embedded in the embedding groove 501 to achieve connection. During subsequent installation, the transmission shaft 500 can be inserted into the mounting hole 104 from the outside for operation. The unclosed U-shaped groove close to the direction end of the inner rotor 300 is conducive to the embedding of the convex portion 302 during assembly, and the assembly is simple. During later maintenance, the transmission shaft 500 can be disassembled from the inner rotor 300 by applying a force to pull the transmission shaft 500 out of the mounting hole 104. The inner rotor 300 and the outer rotor 200 in the oil chamber 101 can be inspected and maintained through the mounting hole 104, especially when the oil in the oil chamber 101 is emulsified or deposited, which is convenient for inspection and cleaning. Further, in order to ensure the function and improve the convenience of maintenance, a first mounting groove 106 is provided at one end of the mounting hole 104 close to the oil chamber 101, and a second mounting groove 105 is provided at the other end; a support bearing 800 is provided in the first mounting groove 106, the outer ring of the support bearing 800 is tightly fitted with the first mounting groove 106, and the inner ring of the support bearing 800 is in rotational contact with the transmission shaft 500; an oil seal 900 is provided in the second mounting groove 105, the outer ring of the oil seal 900 is tightly fitted with the second mounting groove 105, and the inner ring of the oil seal 900 is in rotational contact with the transmission shaft 500.

[0034] In some embodiments, a first groove 404 facing the oil inlet channel 102 and a second groove 405 facing the oil outlet channel 103 are provided on the seat body 401. The cooperation of the first groove 404 and the second groove 405 expands the oil storage space corresponding to the oil inlet channel 102 and the oil outlet channel 103 in the oil chamber 101, which is beneficial to improving the pumping capacity of the lubricating liquid and reducing the operating noise.

[0035] It is worth noting that the inner teeth 201 and the outer teeth 301 of the present invention can achieve the maximum degree of engagement when the inner rotor 300 and the outer rotor 200 are not coaxial, and there is no inevitable oil trapping phenomenon caused by the involute gear form during high-speed operation, thereby avoiding pulsation and cavitation, reducing working noise and extending the service life of the product.

[0036] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An internal meshing low-noise oil supply pump, comprising an oil pump body (100), an outer rotor (200), an inner rotor (300), a guide wheel seat (400) and a transmission shaft (500), characterized in that: The oil pump body (100) is provided with an oil chamber (101), an oil inlet channel (102), an oil outlet channel (103) and a mounting hole (104); The outer rotor (200) and the inner rotor (300) are movably embedded in the oil chamber (101); the inner circumference of the outer rotor (200) is evenly distributed with internal teeth (201); the outer circumference of the inner rotor (300) is evenly distributed with external teeth (301); both the internal teeth (201) and the external teeth (301) are curve patterns combining circular arc curves and cycloid tooth profile curves; the outer rotor (200) and the inner rotor (300) are not coaxial, and the external teeth (301) are drivingly embedded with the internal teeth (201); The guide wheel seat (400) comprises a seat body (401) and a shaft body (403); the seat body (401) is fixedly fitted to the oil pump body (100) to close the oil chamber (101); and the transmission shaft (500) passes through the inner rotor (300) and the mounting hole (104) in sequence; The transmission shaft (500) is sleeved on the shaft body (403), the shaft body (403) is rotatably matched with the mounting hole (104), and the end portion close to one end of the seat body (401) is connected to the inner rotor (300).

2. The internal meshing low noise oil supply pump according to claim 1, characterized in that: The outer rotor (200) and the inner rotor (300) are both made of iron-based copper-nickel powder alloy.

3. The internal meshing low noise oil supply pump according to claim 1, characterized in that: The seat body (401) is provided with a plurality of through holes (402), the oil pump body (100) is provided with threaded holes (107) corresponding to the through holes (402) one by one, and screws (600) are provided to pass through the through holes (402) and be threadedly connected to the threaded holes (107) to fix the guide wheel seat (400) to the oil pump body (100).

4. The internal meshing low noise oil supply pump according to claim 1, characterized in that: The position at which the oil outlet channel (103) is connected to the oil chamber (101) is arranged on one side of the engagement direction of the outer teeth (301) and the inner teeth (201), and the position at which the oil inlet channel (102) is connected to the oil chamber (101) is arranged on a side away from the engagement direction of the outer teeth (301) and the inner teeth (201).

5. The internal meshing low noise oil supply pump according to claim 1, characterized in that: A sealing ring (700) is provided on the outer peripheral side of the oil pump body (100).

6. The internal meshing low noise oil supply pump according to claim 1, characterized in that: A protruding convex portion (302) is provided on the inner side of the inner rotor (300), and an embedding groove (501) is provided on the end of the transmission shaft (500) close to one end of the inner rotor (300), and the end of the transmission shaft (500) is inserted into the inner side of the inner rotor (300) so that the convex portion (302) is embedded in the embedding groove (501).

7. The internal meshing low noise oil supply pump according to claim 1, characterized in that: A first mounting groove (106) is provided at one end of the mounting hole (104) close to the oil chamber (101), and a second mounting groove (105) is provided at the other end; A support bearing (800) is disposed in the first installation groove (106), an outer ring of the support bearing (800) is tightly fitted with the first installation groove (106), and an inner ring of the support bearing (800) is in rotational contact with the transmission shaft (500); An oil seal (900) is disposed in the second mounting groove (105); an outer ring of the oil seal (900) is tightly fitted with the second mounting groove (105), and an inner ring of the oil seal (900) is in rotational contact with the transmission shaft (500).

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