Oil pump with dynamic embossing groove structure

Abstract

The utility model relates to an oil pump with a dynamic embossing groove structure. The oil pump comprises a driving pump gear shaft, a driven pump gear shaft, a pump shell, a front cover plate and a rear cover plate, the pump shell is provided with an oil pump oil inlet, an oil pump oil cavity, a gear shaft cavity, an internal pressure unloading channel and an oil pump oil outlet which are communicated in sequence, the driving pump gear shaft and the driven pump gear shaft are both installed in the gear shaft cavity, and the front cover plate and the rear cover plate are fixed to the input side and the output side of the pump shell respectively. The gear shaft is characterized in that a first dynamic knurling groove and a second dynamic knurling groove are formed in the end face of the oil suction side of the gear shaft cavity; the first dynamic embossing groove is distributed around the driving pump gear shaft, and a first dynamic pressure unloading opening and a first groove oil inlet are both communicated with the oil pump oil cavity; the second dynamic embossing groove is distributed around the driven pump gear shaft, the second dynamic pressure unloading opening and the second groove oil inlet are both communicated with the oil pump oil cavity, and the first dynamic embossing groove and the second dynamic embossing groove are provided with converging sections which are communicated with each other. The oil pumping device is reasonable in structural design, good in oil pumping effect and convenient to maintain and repair.

Description

Technical Field

[0001] The utility model relates to an oil pump, in particular to an oil pump with a dynamic pressure flower-shaped groove structure. Background Art

[0002] Oil pumps are primarily used to pump oil. High-performance pumps offer excellent pumping performance, reducing oil intake and saving costs while also playing a key role in lubrication, cooling, sealing, and other aspects. Currently, most commonly used oil pumps on the market draw in oil by creating a vacuum created by the spatial changes between gears and seals. This type of pump offers poor pumping performance, resulting in deficiencies in lubrication, cooling, and sealing reliability. Utility Model Content

[0003] The purpose of the utility model is to overcome the above-mentioned deficiencies in the prior art and to provide an oil pump with a dynamic pressure flower groove structure which has a reasonable structural design, good oil pumping effect and is easy to maintain and repair.

[0004] The technical solution adopted by the utility model to solve the above problems is: the oil pump with a dynamic pressure flower groove structure includes an active pump gear shaft, a driven pump gear shaft, a pump housing, a No. 1 bearing, a No. 2 bearing, a No. 3 bearing, a No. 4 bearing, a No. 5 bearing, an oil seal, a front cover plate and a rear cover plate, the pump housing is provided with an oil pump inlet, an oil pump oil cavity, a gear shaft cavity, an internal pressure unloading channel and an oil pump outlet that are sequentially connected, the active pump gear shaft is rotatably mounted in the gear shaft cavity through the No. 1 bearing, the No. 2 bearing and the No. 5 bearing, the shaft extension end of the active pump gear shaft extends outside the pump housing, the driven pump gear shaft is rotatably mounted in the gear shaft cavity through the No. 3 bearing and the No. 4 bearing, the driven pump gear shaft is meshed with the active pump gear shaft, The front cover is fixed on the input side of the pump casing, and an oil seal is provided between the front cover and the active pump gear shaft. The rear cover is fixed on the output side of the pump casing, and its structural features are: the oil suction side end face of the gear shaft cavity is provided with a No. 1 dynamic embossing flower-shaped groove and a No. 2 dynamic embossing flower-shaped groove, the No. 1 dynamic embossing flower-shaped groove is distributed around the active pump gear shaft, and the No. 1 dynamic pressure unloading port and the No. 1 groove oil inlet in the No. 1 dynamic embossing flower-shaped groove are both connected to the oil chamber of the oil pump, the No. 2 dynamic embossing flower-shaped groove is distributed around the driven pump gear shaft, and the No. 2 dynamic pressure unloading port and the No. 2 groove oil inlet in the No. 2 dynamic embossing flower-shaped groove are both connected to the oil chamber of the oil pump, and the No. 1 dynamic embossing flower-shaped groove and the No. 2 dynamic embossing flower-shaped groove have a mutually connected confluence section.

[0005] Preferably, the shapes of the No. 1 dynamic embossing flower-shaped groove and the No. 2 dynamic embossing flower-shaped groove of the present invention are both flower-shaped structures, and the No. 1 dynamic embossing flower-shaped groove and the No. 2 dynamic embossing flower-shaped groove are meshed in the confluence section.

[0006] Preferably, the shapes of the No. 1 dynamic pressure flower-shaped groove and the No. 2 dynamic pressure flower-shaped groove of the present invention are both flower-shaped structures, and the No. 1 dynamic pressure flower-shaped groove is provided with a No. 1 inverted hook-shaped structure in each petal-shaped structure, and the No. 2 dynamic pressure flower-shaped groove is provided with a No. 2 inverted hook-shaped structure in each petal-shaped structure.

[0007] Preferably, the shape of the first dynamic embossing flower-shaped groove of the present invention matches the profile of the active pump gear shaft, and the shape of the second dynamic embossing flower-shaped groove matches the profile of the driven pump gear shaft. The profiles of the active pump gear shaft and the driven pump gear shaft include lines that meet the following formula:

[0008] x11=-rm1-basic.r*cos(t1)+basic.a;

[0009] y11=basic.r*sin(t1);

[0010] Where: x represents the coordinate, the first 1 in x11 represents the active pump gear shaft, and the second 1 in x11 represents the first segment of the profile; rm1 represents the pitch radius of the active pump gear shaft; basic.r represents the tooth height radius of the active pump gear shaft; t1 represents the variable; basic.a represents the center distance between the active pump gear shaft and the driven pump gear shaft; y represents the coordinate, the first 1 in y11 represents the active pump gear shaft, and the second 1 in y11 represents the first segment of the profile;

[0011] x21=rm2-basic.r*cos(u1);

[0012] y21=basic.r*sin(u1);

[0013] In the formula: x represents the coordinate, 2 in x21 represents the driven pump gear shaft, and 1 in x21 represents the first line segment in the profile; rm2 represents the pitch circle radius of the driven pump gear shaft; basic.r represents the tooth height radius of the active pump gear shaft; u1 represents the variable; y represents the coordinate, 2 in y21 represents the driven pump gear shaft, and 1 in y21 represents the first line segment in the profile.

[0014] Preferably, the profile of the active pump gear shaft and the profile of the driven pump gear shaft of the present invention include lines that conform to the following formula:

[0015] x12=-b3*cos(beta)-r2*cos(t2)+a;

[0016] y12=-b3*sin(beta)+r2*sin(t2);

[0017] Wherein: x represents the coordinate, 1 in x12 represents the active pump gear shaft, 2 in x12 represents the second segment of the profile; b3 represents the distance between the center of the second segment of the arc of the active pump gear shaft and the center of the active pump gear shaft; beta represents the angle between the center of the second segment of the arc of the active pump gear shaft and the X-axis; r2 represents the radius of the second segment of the arc of the active pump gear shaft; t2 represents a variable; a represents the center distance between the active pump gear shaft and the driven pump gear shaft; y represents the coordinate, 1 in y12 represents the active pump gear shaft, 2 in y12 represents the second segment of the profile;

[0018] x22=-b3*cos((1+i)*u2-i*(beta))-r2*cos(t22-(1+i)*u2+i*(beta))+a*cos(i*u2-i*(beta));

[0019] y22=-b3*sin((1+i)*u2-i*(beta))+r2*sin(t22-(1+i)*u2+i*(beta))+a*sin(i*u2-i*(beta));

[0020] In the formula: x represents the coordinate, the first 2 in x22 represents the driven pump gear shaft, and the second 2 in x22 represents the second segment of the profile; b3 represents the distance between the center of the second segment of the arc of the active pump gear shaft and the center of the active pump gear shaft; i represents the tooth number ratio between the number of teeth on the active pump gear shaft and the number of teeth on the driven pump gear shaft; u2 represents the relationship between the position parameter of the driven pump gear shaft and the curve parameter of the driven pump gear shaft; beta represents the angle between the center of the second segment of the arc of the active pump gear shaft and the X-axis; r2 represents the radius of the second segment of the arc of the active pump gear shaft; t22 represents a variable; a represents the center distance between the active pump gear shaft and the driven pump gear shaft; y represents the coordinate, the first 2 in y22 represents the driven pump gear shaft, and the second 2 in y22 represents the second segment of the profile.

[0021] Preferably, the width of the No. 1 dynamic embossing flower-shaped groove and the No. 2 dynamic embossing flower-shaped groove of the present invention are both 0.5-10 mm, and the depth of the No. 1 dynamic embossing flower-shaped groove and the No. 2 dynamic embossing flower-shaped groove are both 0.2-4 mm.

[0022] Preferably, the active pump gear shaft of the present invention is a male rotor, and the driven pump gear shaft is a female rotor.

[0023] Preferably, the rear cover plate of the present invention is fixed to the output side of the pump housing by means of positioning pins.

[0024] Preferably, the pump housing of the present invention is provided with bolt holes for fixing to an external driving device.

[0025] A method for operating an oil pump with a dynamic pressure flower groove structure is characterized by the following steps: an external driving device is connected to the shaft extension end of the active pump gear shaft, and the external driving device drives the active pump gear shaft to rotate, and oil enters the oil pump oil chamber of the pump housing through the oil pump inlet; the oil after entering the oil pump oil chamber flows into the No. 1 dynamic pressure flower groove and the No. 2 dynamic pressure flower groove, and flows into the open tooth groove between the active pump gear shaft and the driven pump gear shaft; the active pump gear shaft drives the driven pump gear shaft to rotate, and under high-speed operation, when the spiral grooves on the active pump gear shaft and the spiral grooves on the driven pump gear shaft rotate from an open state to a closed state, the oil will be sucked into the space between the spiral grooves of the active pump gear shaft and the spiral grooves of the driven pump gear shaft, and then this part of the oil is sealed. As the active pump gear shaft and the driven pump gear shaft rotate, the space of this part of the oil is continuously reduced, and then it is squeezed by the active pump gear shaft and the driven pump gear shaft and sent to the oil pump outlet through the internal pressure unloading channel, and the oil pump outlet is connected to the oil-supplied equipment to complete the oil supply.

[0026] Preferably, during the operation of the oil pump of the present invention, the No. 1 dynamic embossing flower-shaped groove and the No. 2 dynamic embossing flower-shaped groove evenly distribute the oil on the oil suction side end face, and the oil film generated by the oil itself forms an oil film seal on the oil suction side end face, thereby reducing the amount of oil leakage and increasing the volumetric efficiency; when the oil pump frequently switches between high and low frequencies, affected by the input torque, the driven pump gear shaft will instantaneously move toward the oil suction side end face, because the oil enters from the No. 1 groove oil inlet of the No. 1 dynamic embossing flower-shaped groove and the No. 2 groove oil inlet of the No. 2 dynamic embossing flower-shaped groove and is evenly distributed on the oil suction side end face, that is, the oil suction side end face is covered with lubricating oil, and due to the incompressibility of the liquid, the driven pump gear shaft is forced to be unable to directly contact the oil suction side end face, thereby avoiding the driven pump gear shaft from scratching or colliding with the oil suction side end face and damaging the oil pump.

[0027] Preferably, during the operation of the oil pump of the present invention, the active pump gear shaft and the driven pump gear shaft rotate, and each rotation will form an identical and consistent frequency according to the number of profile tooth grooves. When the short side of the active pump gear shaft just rotates past the corresponding position on the No. 1 dynamic embossing flower groove, the oil in the No. 1 dynamic embossing flower groove will be taken away, thereby increasing the oil pumping effect of the oil pump; when too much oil enters the No. 1 groove oil inlet of the No. 1 dynamic embossing flower groove and the No. 2 groove oil inlet of the No. 2 dynamic embossing flower groove, resulting in oil accumulation on the oil suction side end face, under the rotation of the active pump gear shaft and the driven pump gear shaft, the oil in the No. 1 dynamic embossing flower groove flows out from the No. 1 dynamic pressure unloading port, and the oil in the No. 2 dynamic embossing flower groove flows out from the No. 2 dynamic pressure unloading port, and the accumulated oil on the oil suction side end face is removed by the kinetic energy brought by the rotation of the active pump gear shaft and the driven pump gear shaft, thereby eliminating the oil accumulation phenomenon.

[0028] As a preferred embodiment, when fine particles of impurities contained in the oil escape through the front filter to the oil pump suction side, the first and second dynamic pressure flower grooves serve as the first line of defense. Since the first dynamic pressure flower groove is provided with a first inverted hook structure, and the second dynamic pressure flower groove is provided with a second inverted hook structure, the first and second inverted hook structures create an obstacle for impurities as they pass through, preventing them from passing through the first and second dynamic pressure flower grooves and entering the joint surface of the active pump gear shaft and the driven pump gear shaft. The outer wall of the pump housing is monitored by a magnetic vibration sensor. When an abnormal frequency of pumping oil is detected, a prompt is issued, and the machine is stopped for inspection. The inspection only requires removing the rear cover and the driven pump gear shaft. After removal, rotating the active pump gear shaft one circle can determine whether there is any foreign matter in the first dynamic pressure flower groove. This can effectively increase the service life of the oil pump, thereby achieving the goal of reducing costs and increasing efficiency.

[0029] Compared with the existing technology, this utility model has the following advantages and effects: the application of the structure of the No. 1 and No. 2 dynamic pressure flower grooves in the oil pump not only increases the oil pumping capacity, but also greatly enhances the stability and safety of the oil pumping, effectively solving the problem of unstable oil pumping under large displacement and high pressure. The No. 1 and No. 2 dynamic pressure flower grooves are convenient and easy to manufacture. The meshing clearance of the dynamic pressure spiral grooves of the active pump gear shaft and the driven pump gear shaft is smaller, reducing pump oil leakage and significantly increasing oil pumping capacity by 3% to 5%. The No. 1 and No. 2 dynamic pressure flower grooves are placed on the suction side of the oil pump, effectively blocking large impurities from entering core components and better protecting them. With each rotation of the active and passive pump gear shafts, the No. 1 and No. 2 dynamic pressure flower grooves emit the same frequency with the same number of teeth. When large impurities are blocked by the No. 1 and No. 2 dynamic pressure flower grooves, the frequency changes, facilitating timely cleaning of impurities. When handling large impurities in the No. 1 and No. 2 dynamic pressure flower grooves, there is no need to completely remove them; only the rear cover is removed, and the driven pump gear shaft can be cleaned of impurities. This makes maintenance easier, saves manpower, material, and financial resources, and also protects the entire system in which the oil pump is used. The oil inlet side of the oil pump is placed on a different side from the shaft extension, significantly reducing the installation space requirement. The No. 1 and No. 2 dynamic pressure grooves evenly distribute oil on the suction side of the oil pump and prevent the gear shaft from scraping or colliding with the suction side when the gear shaft moves toward the suction side. This new oil pump achieves superior pumping performance compared to similarly sized pumps. Even in harsh operating scenarios, it can monitor the health of the oil pump in advance, extending its service life and making subsequent maintenance more efficient and convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention and / or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments and / or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0031] Figure 1 It is a schematic cross-sectional view of the oil pump with a dynamic pressure flower-shaped groove structure in an embodiment of the present utility model.

[0032] Figure 2 It is a schematic diagram of the three-dimensional structure of the oil pump with a dynamic pressure flower-shaped groove structure in an embodiment of the utility model.

[0033] Figure 3 It is an enlarged structural schematic diagram of the locations of the oil chamber of the oil pump, the No. 1 dynamic pressure flower-shaped groove and the No. 2 dynamic pressure flower-shaped groove in the embodiment of the utility model.

[0034] Figure 4 It is an enlarged structural schematic diagram of the positions of the gear shaft cavity, the internal pressure unloading channel and the oil pump outlet in the embodiment of the present utility model.

[0035] Figure 5 It is an enlarged structural diagram of the positions of the No. 1 dynamic embossing flower-shaped groove and the No. 2 dynamic embossing flower-shaped groove in the embodiment of the present utility model, and is mainly used to reflect the structure of the No. 1 dynamic embossing flower-shaped groove and the No. 2 dynamic embossing flower-shaped groove.

[0036] Figure 6 This is a schematic diagram comparing a section of the profile of the dynamic pressure spiral groove in an embodiment of the present utility model before and after the change.

[0037] In the figure: 1-driving pump gear shaft; 2-driven pump gear shaft; 3-pump housing; 4-bearing No. 1; 5-bearing No. 2; 6-bearing No. 3; 7-bearing No. 4; 8-bearing No. 5; 9-oil seal; 10-front cover; 11-rear cover; 12-locating pin; 13-oil pump inlet; 14-oil pump outlet; 18-dynamic pressure unloading port No. 1; 19-dynamic pressure unloading port No. 2; 20-oil inlet No. 1 groove; 21-internal pressure unloading channel; 22-bolt hole; 23-oil pump oil chamber; 24-dynamic pressure flower-shaped groove No. 1; 25-dynamic pressure flower-shaped groove No. 2; 26-merging section; 27-inverted hook-shaped structure No. 1; 28-inverted hook-shaped structure No. 2; 29-oil inlet No. 2 groove; 30-oil suction side end face; 31-gear shaft chamber; 32-shaft extension end. DETAILED DESCRIPTION

[0038] The present invention will be further described in detail below with reference to the accompanying drawings and through examples. The following examples are provided to explain the present invention, but the present invention is not limited to the following examples.

[0039] Example

[0040] See also Figures 1 to 6 The oil pump with a dynamic embossing groove structure in this embodiment includes an active pump gear shaft 1, a driven pump gear shaft 2, a pump housing 3, a No. 1 bearing 4, a No. 2 bearing 5, a No. 3 bearing 6, a No. 4 bearing 7, a No. 5 bearing 8, an oil seal 9, a front cover plate 10 and a rear cover plate 11, wherein the active pump gear shaft 1 is a male rotor and the driven pump gear shaft 2 is a female rotor.

[0041] The pump housing 3 in this embodiment is provided with an oil pump inlet 13, an oil pump oil chamber 23, a gear shaft chamber 31, an internal pressure unloading channel 21 and an oil pump outlet 14 which are connected in sequence. The active pump gear shaft 1 is rotatably mounted in the gear shaft chamber 31 through bearing No. 1, bearing No. 2, bearing 5 and bearing No. 5, and the shaft extension end 32 of the active pump gear shaft 1 extends outside the pump housing 3. The driven pump gear shaft 2 is rotatably mounted in the gear shaft chamber 31 through bearing No. 3 and bearing No. 4, 7. The driven pump gear shaft 2 is meshed with the active pump gear shaft 1, and the rotation of the active pump gear shaft 1 can drive the driven pump gear shaft 2 to rotate.

[0042] In this embodiment, the front cover plate 10 is fixed to the input side of the pump housing 3. An oil seal 9 is installed between the front cover plate 10 and the active pump gear shaft 1. The rear cover plate 11 is fixed to the output side of the pump housing 3 via locating pins 12, making assembly very convenient. Bolt holes 22 for securing to an external drive device are provided on the pump housing 3, making it easy to install the oil pump in this embodiment to the external drive device.

[0043] The oil suction side end face 30 of the gear shaft cavity 31 in this embodiment is provided with a No. 1 dynamic pressure flower-shaped groove 24 and a No. 2 dynamic pressure flower-shaped groove 25. The No. 1 dynamic pressure flower-shaped groove 24 is distributed around the active pump gear shaft 1, and the No. 1 dynamic pressure unloading port 18 and the No. 1 groove oil inlet 20 in the No. 1 dynamic pressure flower-shaped groove 24 are both connected to the oil pump oil cavity 23. The No. 2 dynamic pressure flower-shaped groove 25 is distributed around the passive pump gear shaft 2, and the No. 2 dynamic pressure unloading port 19 and the No. 2 groove oil inlet 29 in the No. 2 dynamic pressure flower-shaped groove 25 are both connected to the oil pump oil cavity 23. The No. 1 dynamic pressure flower-shaped groove 24 and the No. 2 dynamic pressure flower-shaped groove 25 have a mutually connected confluence section 26.

[0044] In this embodiment, both the first and second dynamic pressure flower-shaped grooves 24, 25 are in the shape of flower-shaped structures, meshing with each other at the junction 26. Each petal of the first dynamic pressure flower-shaped groove 24 is provided with a first inverted hook-shaped structure 27, while each petal of the second dynamic pressure flower-shaped groove 25 is provided with a second inverted hook-shaped structure 28. The shape of the flower-shaped structures is clear to those skilled in the art.

[0045] Typically, the width of the No. 1 dynamic embossing flower-shaped groove 24 and the No. 2 dynamic embossing flower-shaped groove 25 in this embodiment is 0.5-10 mm, and the depth of the No. 1 dynamic embossing flower-shaped groove 24 and the No. 2 dynamic embossing flower-shaped groove 25 is 0.2-4 mm.

[0046] In this embodiment, the shape of the No. 1 dynamic embossing flower-shaped groove 24 matches the profile of the active pump gear shaft 1, and the shape of the No. 2 dynamic embossing flower-shaped groove 25 matches the profile of the passive pump gear shaft 2. The profiles of the active pump gear shaft 1 and the passive pump gear shaft 2 include lines that meet the following formula:

[0047] x11=-rm1-basic.r*cos(t1)+basic.a;

[0048] y11=basic.r*sin(t1);

[0049] Where: x represents the coordinate, the first 1 in x11 represents the active pump gear shaft 1, and the second 1 in x11 represents the first segment of the profile; rm1 represents the pitch radius of the active pump gear shaft 1; basic.r represents the tooth height radius of the active pump gear shaft 1; t1 represents the variable; basic.a represents the center distance between the active pump gear shaft 1 and the driven pump gear shaft 2; y represents the coordinate, the first 1 in y11 represents the active pump gear shaft 1, and the second 1 in y11 represents the first segment of the profile;

[0050] x21=rm2-basic.r*cos(u1);

[0051] y21=basic.r*sin(u1);

[0052] In the formula: x represents the coordinate, 2 in x21 represents the driven pump gear shaft 2, and 1 in x21 represents the first line segment in the profile; rm2 represents the pitch circle radius of the driven pump gear shaft 2; basic.r represents the tooth height radius of the active pump gear shaft 1; u1 represents the variable; y represents the coordinate, 2 in y21 represents the driven pump gear shaft 2, and 1 in y21 represents the first line segment in the profile.

[0053] The profile of the active pump gear shaft 1 and the profile of the passive pump gear shaft 2 in this embodiment include lines that conform to the following formula:

[0054] x12=-b3*cos(beta)-r2*cos(t2)+a;

[0055] y12=-b3*sin(beta)+r2*sin(t2);

[0056] Wherein: x represents the coordinate, 1 in x12 represents the active pump gear shaft 1, and 2 in x12 represents the second segment of the profile; b3 represents the distance between the center of the second segment of the arc of the active pump gear shaft 1 and the center of the active pump gear shaft 1; beta represents the angle between the center of the second segment of the arc of the active pump gear shaft 1 and the X-axis; r2 represents the radius of the second segment of the arc of the active pump gear shaft 1; t2 represents a variable; a represents the center distance between the active pump gear shaft 1 and the driven pump gear shaft 2; y represents the coordinate, 1 in y12 represents the active pump gear shaft 1, and 2 in y12 represents the second segment of the profile;

[0057] x22=-b3*cos((1+i)*u2-i*(beta))-r2*cos(t22-(1+i)*u2+i*(beta))+a*cos(i*u2-i*(beta));

[0058] y22=-b3*sin((1+i)*u2-i*(beta))+r2*sin(t22-(1+i)*u2+i*(beta))+a*sin(i*u2-i*(beta));

[0059] In the formula: x represents the coordinate, the first 2 in x22 represents the driven pump gear shaft 2, and the second 2 in x22 represents the second segment of the profile; b3 represents the distance between the center of the second segment of the arc of the active pump gear shaft 1 and the center of the active pump gear shaft 1; i represents the tooth number ratio between the number of teeth on the active pump gear shaft 1 and the number of teeth on the driven pump gear shaft 2; u2 represents the relationship between the position parameter of the driven pump gear shaft 2 and the curve parameter of the driven pump gear shaft 2; beta represents the angle between the center of the second segment of the arc of the active pump gear shaft 1 and the X-axis; r2 represents the radius of the second segment of the arc of the active pump gear shaft 1; t22 represents a variable; a represents the center distance between the active pump gear shaft 1 and the driven pump gear shaft 2; y represents the coordinate, the first 2 in y22 represents the driven pump gear shaft 2, and the second 2 in y22 represents the second segment of the profile.

[0060] The profile lines obtained by simulation using Matlab profile calculation software are shown in the attached Figure 6 Among them, the first orange-red line from top to bottom is the N-type line in the existing screw profile, that is, the shape of the center distance has not been changed; the second orange-red line from top to bottom is the profile part calculated by the above two sets of formulas. Compared with the N-type line in the existing screw profile, the center distance has been changed. Figure 6It can be seen that after the center distance is reduced in the profile of this embodiment, the contact area of the profile is smaller and the gap is smaller than before the adjustment, which is beneficial to better reduce the leakage of lubricating oil during operation of the active pump gear shaft 1 and the driven pump gear shaft 2. After testing, it was found that the volumetric efficiency of the oil pump after the profile change is improved by 3% to 5% compared with the previous one. That is, the oil pump of the same displacement has significantly increased the amount of oil pumped in the same time period compared with the previous one, and the oil pumping stability under high speed and high pressure has been significantly improved. The profile tooth top circle of the active pump gear shaft 1 and the driven pump gear shaft 2 in this embodiment is reduced, the root circle is increased, the contact area is smoother, and the profile gap can be more tightly controlled, reducing liquid leakage and increasing the oil pumping efficiency.

[0061] The working method of the oil pump with dynamic pressure flower-shaped groove structure in this embodiment is as follows: an external driving device is connected to the shaft extension end 32 of the active pump gear shaft 1, and the active pump gear shaft 1 is driven to rotate by the external driving device, and the oil enters the oil pump oil chamber 23 of the pump housing 3 through the oil pump oil inlet 13; the oil after entering the oil pump oil chamber 23 flows into the No. 1 dynamic pressure flower-shaped groove 24 and the No. 2 dynamic pressure flower-shaped groove 25, as well as into the open tooth groove between the active pump gear shaft 1 and the driven pump gear shaft 2; the active pump gear shaft 1 drives the driven pump gear shaft 2 to rotate, and under high-speed operation When the spiral grooves on the active pump gear shaft 1 and the spiral grooves on the driven pump gear shaft 2 rotate from an open state to a closed state, oil will be sucked into the space between the spiral grooves of the active pump gear shaft 1 and the spiral grooves of the driven pump gear shaft 2, and then this part of the oil will be sealed. As the active pump gear shaft 1 and the driven pump gear shaft 2 rotate, the space of this part of the oil is continuously reduced, and then it is squeezed by the active pump gear shaft 1 and the driven pump gear shaft 2 and sent to the oil pump outlet 14 through the internal pressure unloading channel 21. The oil pump outlet 14 is connected to the oiled equipment to complete the oil supply.

[0062] During the operation of the oil pump in this embodiment, the No. 1 dynamic embossing flower-shaped groove 24 and the No. 2 dynamic embossing flower-shaped groove 25 evenly distribute the oil on the oil suction side end face 30, and the oil film generated by the oil itself enables the oil suction side end face 30 to form an oil film seal, thereby reducing the amount of oil leakage and increasing the volumetric efficiency; when the oil pump frequently switches between high and low frequencies, affected by the input torque, the driven pump gear shaft 2 will instantaneously move toward the oil suction side end face 30, because the oil enters from the No. 1 groove oil inlet 20 of the No. 1 dynamic embossing flower-shaped groove 24 and the No. 2 groove oil inlet 29 of the No. 2 dynamic embossing flower-shaped groove 25 and is evenly distributed on the oil suction side end face 30, that is, the oil suction side end face 30 is covered with lubricating oil. Due to the incompressibility of the liquid, the driven pump gear shaft 2 is forced to be unable to directly contact the oil suction side end face 30, thereby avoiding the driven pump gear shaft 2 from scratching or colliding with the oil suction side end face 30 and damaging the oil pump.

[0063] During the operation of the oil pump in this embodiment, the active pump gear shaft 1 and the driven pump gear shaft 2 rotate. Each time they rotate one circle, the same and consistent frequency is formed according to the number of profile tooth grooves. When the short side of the active pump gear shaft 1 just rotates past the corresponding position on the No. 1 dynamic embossing flower-shaped groove 24, the oil in the No. 1 dynamic embossing flower-shaped groove 24 is taken away, thereby increasing the oil pumping effect of the oil pump. The short side of the active pump gear shaft 1 is common knowledge in this field; when the No. 1 groove of the No. 1 dynamic embossing flower-shaped groove 24 of the pump oil enters When too much oil enters the oil port 20 and the No. 2 dynamic pressure flower-shaped groove 25 at the oil inlet 29, resulting in oil accumulation on the oil suction side end face 30, under the rotation of the active pump gear shaft 1 and the driven pump gear shaft 2, the oil in the No. 1 dynamic pressure flower-shaped groove 24 flows out from the No. 1 dynamic pressure unloading port 18, and the oil in the No. 2 dynamic pressure flower-shaped groove 25 flows out from the No. 2 dynamic pressure unloading port 19. The kinetic energy brought by the rotation of the active pump gear shaft 1 and the driven pump gear shaft 2 removes the accumulated oil on the oil suction side end face 30, thereby eliminating the oil accumulation phenomenon.

[0064] When fine particles of impurities contained in the oil escape to the oil suction side of the oil pump through the front filter, the No. 1 dynamic pressure flower-shaped groove 24 and the No. 2 dynamic pressure flower-shaped groove 25 serve as the first protective structure. Since the No. 1 dynamic pressure flower-shaped groove 24 is provided with a No. 1 inverted hook structure 27 and the No. 2 dynamic pressure flower-shaped groove 25 is provided with a No. 2 inverted hook structure 28, the No. 1 inverted hook structure 27 and the No. 2 inverted hook structure 28 form an obstacle for impurities when passing through, preventing impurities from passing through the No. 1 dynamic pressure flower-shaped groove 24 and the No. 2 dynamic pressure flower-shaped groove 25 and entering the joint surface of the active pump gear shaft 1 and the driven pump gear shaft 2; the outer wall of the pump casing 3 is monitored by a magnetic vibration sensor, and a prompt is given when an abnormal frequency of the pump oil is found. At this time, the machine is stopped for inspection. The inspection only requires removing the rear cover 11 and the driven pump gear shaft 2. After removal, rotating the active pump gear shaft 1 one circle can determine whether there is any foreign matter in the No. 1 dynamic pressure flower-shaped groove 24.

[0065] In addition, it should be noted that the shapes and names of the parts and components of the specific embodiments described in this specification may be different, and the above content described in this specification is merely an example of the structure of the utility model. Any equivalent changes or simple changes made based on the structure, features and principles described in the concept of the utility model patent are included in the scope of protection of the utility model patent. Technicians in the technical field of the utility model can make various modifications or supplements to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the structure of the utility model or exceed the scope defined by the claims, they should fall within the scope of protection of the utility model.

Claims

1. An oil pump with a dynamic pressure flower groove structure, comprising an active pump gear shaft (1), a driven pump gear shaft (2), a pump housing (3), a No. 1 bearing (4), a No. 2 bearing (5), a No. 3 bearing (6), a No. 4 bearing (7), a No. 5 bearing (8), an oil seal (9), a front cover plate (10) and a rear cover plate (11), wherein the pump housing (3) is provided with an oil pump inlet (13), an oil pump oil cavity (23), a gear shaft cavity (31), an internal pressure unloading channel (21) and an oil pump outlet (14) which are sequentially connected, and the active pump gear shaft (1) is connected to the No. 1 bearing (4), the No. 2 bearing (5), the No. 3 bearing (6), the No. 4 bearing (7), the No. 5 bearing (8), an oil seal (9), a front cover plate (10) and a rear cover plate (11), wherein the pump housing (3) is provided with an oil pump inlet (13), an oil pump oil cavity (23), a gear shaft cavity (31), an internal pressure unloading channel (21) and an oil pump outlet (14) which are sequentially connected, (5) and the fifth bearing (8) are rotatably mounted in the gear shaft cavity (31), the shaft extension end (32) of the active pump gear shaft (1) extends outside the pump housing (3), the driven pump gear shaft (2) is rotatably mounted in the gear shaft cavity (31) through the third bearing (6) and the fourth bearing (7), the driven pump gear shaft (2) and the active pump gear shaft (1) are engaged, the front cover plate (10) is fixed on the input side of the pump housing (3), an oil seal (9) is provided between the front cover plate (10) and the active pump gear shaft (1), and the rear cover plate (11) is fixed on the output side of the pump housing (3), characterized in that: The oil suction side end surface (30) of the gear shaft cavity (31) is provided with a No. 1 dynamic pressure flower-shaped groove (24) and a No. 2 dynamic pressure flower-shaped groove (25), wherein the No. 1 dynamic pressure flower-shaped groove (24) is distributed around the active pump gear shaft (1), and the No. 1 dynamic pressure unloading port (18) and the No. 1 groove oil inlet (20) in the No. 1 dynamic pressure flower-shaped groove (24) are both connected to the oil pump oil cavity (23), and the No. 2 dynamic pressure flower-shaped groove (25) is distributed around the passive pump gear shaft (2), and the No. 2 dynamic pressure unloading port (19) and the No. 2 groove oil inlet (29) in the No. 2 dynamic pressure flower-shaped groove (25) are both connected to the oil pump oil cavity (23), and the No. 1 dynamic pressure flower-shaped groove (24) and the No. 2 dynamic pressure flower-shaped groove (25) have a mutually connected merging section (26).

2. The oil pump with a dynamic pressure flower groove structure according to claim 1, characterized in that: The first dynamic pressure flower-shaped groove (24) and the second dynamic pressure flower-shaped groove (25) are both in the shape of a flower-shaped structure, and the first dynamic pressure flower-shaped groove (24) and the second dynamic pressure flower-shaped groove (25) are in a meshing shape at the confluence section (26).

3. The oil pump with a dynamic pressure flower groove structure according to claim 1, characterized in that: The shapes of the No. 1 dynamic pressure flower-shaped groove (24) and the No. 2 dynamic pressure flower-shaped groove (25) are both flower-shaped structures. The No. 1 dynamic pressure flower-shaped groove (24) is provided with a No. 1 inverted hook-shaped structure (27) in each petal-shaped structure, and the No. 2 dynamic pressure flower-shaped groove (25) is provided with a No. 2 inverted hook-shaped structure (28) in each petal-shaped structure.

4. The oil pump with a dynamic pressure flower groove structure according to claim 1, characterized in that: The width of the No. 1 dynamic embossing flower-shaped groove (24) and the No. 2 dynamic embossing flower-shaped groove (25) is 0.5 to 10 mm, and the depth of the No. 1 dynamic embossing flower-shaped groove (24) and the No. 2 dynamic embossing flower-shaped groove (25) is 0.2 to 4 mm.

5. The oil pump with a dynamic pressure flower groove structure according to claim 1, characterized in that: The active pump gear shaft (1) is a male rotor, and the driven pump gear shaft (2) is a female rotor.

6. The oil pump with a dynamic pressure flower groove structure according to claim 1, characterized in that: The rear cover plate (11) is fixed to the output side of the pump housing (3) via a positioning pin (12).

7. The oil pump with a dynamic pressure flower groove structure according to claim 1, characterized in that: The pump housing (3) is provided with bolt holes (22) for fixing to an external driving device.

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