CN112013262A - Rotor structure of oil pump - Google Patents
Rotor structure of oil pump Download PDFInfo
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- CN112013262A CN112013262A CN202010886922.2A CN202010886922A CN112013262A CN 112013262 A CN112013262 A CN 112013262A CN 202010886922 A CN202010886922 A CN 202010886922A CN 112013262 A CN112013262 A CN 112013262A
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- rotor
- outer rotor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16N—LUBRICATING
- F16N13/00—Lubricating-pumps
- F16N13/20—Rotary pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16N—LUBRICATING
- F16N13/00—Lubricating-pumps
Abstract
The invention provides a rotor structure of an oil pump, and belongs to the technical field of oil pumps. The rotor structure solves the technical problem that the friction loss between an outer rotor and a pump shell at the transition region of an oil outlet cavity to an oil inlet cavity in the rotor structure of the conventional oil pump is serious. The rotor structure of this oil pump includes the pump case and rotates to inlay and locate inner rotor and outer rotor in the pump case, the outer rotor cover is located form a plurality of pump oil pockets between the outer peripheral of inner rotor and the inner chamber lateral wall of this outer rotor can and the outer peripheral face of this inner rotor, the both ends face homoenergetic of this outer rotor with the pump case inside wall pastes and leans on, the terminal surface of outer rotor has the breach groove that extends to this outer rotor inner chamber lateral wall from the outer peripheral face of this outer rotor, works as when the outer rotor rotates the breach groove can with the pump oil pocket is linked together. The rotor structure of the oil pump can increase the high-rotating-speed volume rate and effectively reduce the abrasion between the end surface of the outer rotor and the inner wall of the pump shell.
Description
Technical Field
The invention belongs to the technical field of oil pumps, and relates to a rotor structure of an oil pump.
Background
The rotor type oil pump comprises a pump body, an inner rotor, an outer rotor, a pump cover and the like. The pump body is provided with a rotor chamber, the inner rotor and the outer rotor are positioned in the rotor chamber, the inner rotor is fixedly arranged in an inner rotor hole and is directly or indirectly driven by a crankshaft gear, the eccentric distance between the centers of the inner rotor and the outer rotor is e, and the inner rotor drives the outer rotor to rotate together along the same direction. The inner rotor of the general rotor type oil pump is provided with 4 or more than 4 convex teeth, the number of the concave teeth of the outer rotor is one more than that of the convex teeth of the inner rotor, so that the inner rotor and the outer rotor can rotate synchronously and asynchronously, and the outline shape curve of the rotor is cycloid or trochoid.
The rotor tooth profile is designed so that when the rotor is rotated to any angle, the tooth profiles of each tooth of the inner and outer rotors always make point contact with each other. Thus, a plurality of working cavities are formed between the inner rotor and the outer rotor, and the volumes of the working cavities are continuously changed along with the rotation of the rotor. In the cavity at one side of the oil inlet channel, because the rotor is disengaged, the volume is gradually increased to generate vacuum, the engine oil is sucked, the rotor continuously rotates, the engine oil is brought to one side of the oil outlet channel, at the moment, the rotor just enters into engagement, the volume of the cavity is reduced, the oil pressure is increased, and the engine oil is extruded out from the tooth space and is pressed and conveyed out through the oil outlet channel. Thus, as the rotor rotates, the oil is continuously sucked and pressed out. When the pump works, the outer rotor is driven by the inner rotor to rotate together, and the end face of the outer rotor generates relative friction with the inner wall of the pump shell, so that friction loss is easily caused; in addition, when the rotor rotates at a high rotating speed, each working cavity is difficult to fully absorb oil, so that the volume efficiency is low.
In order to solve the above problems, chinese patent publication No. CN108953139A discloses an outer rotor capable of reducing wear, which is used for a rotor type oil pump, and the outer rotor is annular and includes an inner circumferential surface and an outer circumferential surface, wherein the inner circumferential surface is provided with a plurality of concave teeth, and the outer circumferential surface is uniformly provided with a plurality of axial grooves.
The structure can relieve the friction loss between the end surface of the outer rotor and the inner wall of the pump shell to a certain degree, improve the volume efficiency to a certain degree, and ensure that the friction loss between the outer rotor and the pump shell at the transition region of the oil outlet cavity and the oil inlet cavity is still serious. In the field of oil pumps, the height of the outer rotor is always flush with the height of the inner rotor, which is beneficial to ensuring the good sealing property of the cavity between the outer rotor and the inner rotor, in addition, the inner wall of the pump shell in the prior art is provided with an oil inlet cavity and an oil outlet cavity, and the cavity between the outer rotor and the inner rotor is right opposite to the cavity along the height direction, the inner wall of the pump shell right opposite to the outer rotor is inevitably provided with partial regions which are uneven, the end face of the outer rotor and the end face of the inner rotor are required to be processed and avoided as smoothly as possible when the outer rotor is prevented from jumping and deflecting, therefore, the technical problem that the end face of the outer rotor is abraded: 1. in consideration of the friction coefficient, the area of the opposite direction of the inner wall of the pump shell and the outer rotor is polished smooth by a high-precision machining tool, so that the friction resistance between the inner wall of the pump shell and the outer rotor is reduced; 2. in view of wear resistance, a wear-resistant gasket is additionally arranged between the end face of the outer rotor and the inner wall of the pump shell, and the gasket is periodically replaced and maintained.
Disclosure of Invention
The invention provides a rotor structure of an oil pump aiming at the problems in the prior art, and the technical problems to be solved by the invention are as follows: the outer rotor and the inner wall of the pump shell are abraded to consume energy.
The purpose of the invention can be realized by the following technical scheme:
the utility model provides an oil pump's rotor structure, includes the pump case and rotates to inlay and locate inner rotor and outer rotor in the pump case, the outer rotor cover is located form a plurality of pump oil pockets between the peripheral of inner rotor and the inner chamber lateral wall of this outer rotor can and the outer peripheral face of this inner rotor, the both ends face homoenergetic of this outer rotor with the pump case inside wall pastes and leans on, its characterized in that, the terminal surface of outer rotor has the breach groove that extends to this outer rotor inner chamber lateral wall from the outer peripheral face of this outer rotor, works as when the outer rotor rotates the breach groove can with the pump oil pocket is linked together.
The pump case is an outer protection shell of the oil pump and forms a closed environment for the engine oil pump to work, the outer rotor is matched in the pump case in a rotating mode, the side wall of an inner cavity of the outer rotor is meshed and matched with an inner rotor which can be driven by an engine, the outer rotor which is eccentrically arranged with the inner rotor can be driven to rotate when the inner rotor rotates, oil absorption and pumping effects are generated by the change of a matching gap between the outer rotor and the inner rotor, the oil storage gap between the outer rotor and the inner rotor is guaranteed to be sealed and stable by the inner wall, which can be attached to two end faces of the outer rotor, of the pump case, an oil inlet groove and an oil outlet groove are formed in the inner wall of the pump case, the oil inlet groove is communicated with the oil storage gap which increases the trend between the outer rotor and the inner rotor, the. The end face of the outer rotor is provided with the notch groove extending from the outer peripheral face of the outer rotor to the side wall of the inner cavity of the outer rotor, so that when the oil pump works, when the notch groove rotates to be communicated with the oil inlet groove or the oil outlet groove, engine oil can flow into or be discharged from the notch groove, the volume efficiency of the engine oil passing in and out is increased, in addition, the engine oil can be stored in the notch groove by a certain amount when entering and exiting an oil storage gap between the outer rotor and the inner rotor, the volume of the notch groove can not change along with the rotation of the outer rotor, therefore, the engine oil in the notch groove can be continuously smeared on the annular area of the end face of the outer rotor and the attachment friction of the pump shell when the outer rotor rotates, and the attachment between the outer rotor and the inner wall of the pump shell forms stable and.
In the rotor structure of the oil pump, the plurality of notch grooves are arranged at intervals along the circumferential direction of the outer rotor, the inner wall of the pump shell is provided with an oil inlet groove and an oil outlet groove which are separated from each other, when the outer rotor rotates, the oil inlet groove can be communicated with the corresponding pump oil cavity through at least one notch groove, and the oil outlet groove can be communicated with the corresponding pump oil cavity through at least one notch groove. Through setting up the circumference interval of a plurality of breach grooves along the external rotor, and the oil feed tank can communicate with the pump oil pocket that corresponds through at least one breach groove when making the external rotor rotate, and make out the oil groove can communicate with the pump oil pocket that corresponds through at least one breach groove, a plurality of breach grooves can improve like this to the frequency of paining with the pump case inner wall of external rotor end face contact, make the pump case inner wall can in time supply in order to guarantee that the oil film lasts stably because of the machine oil of friction consumption, in addition still guarantee to have the breach groove to participate in all the time at oil feed process and play oil in-process, make the machine oil in the breach groove be in the state of dynamic compensation when improving whole working process pump oil efficiency, further guarantee to paint the effect.
In the rotor structure of the oil pump, the side wall of the inner cavity of the outer rotor is provided with a plurality of arc-shaped tooth grooves which are used for being meshed with the inner rotor and pumping oil, and one end of the gap groove close to the side wall of the inner cavity of the outer rotor is positioned at the arc top of the arc-shaped tooth grooves. The arc-shaped tooth grooves are formed in the side wall of the inner cavity of the outer rotor, the arc-shaped tooth grooves can be meshed with the tooth heads on the outer peripheral surface of the inner rotor to pump oil, and one end, facing the outer rotor cavity, of each notch groove is located at the arc top of the corresponding tooth groove.
In the rotor structure of the oil pump, the ratio of the width of the notch groove along the circumferential direction of the outer rotor to the width of the corresponding arc-shaped tooth groove ranges from 1:2 to 1: 6. By setting the ratio range of the width dimension of the notch groove to the width dimension of the arc-shaped tooth groove to be 1: 2-1: 6, the engine oil in the notch groove can be ensured to provide continuous and stable lubrication for the inner wall of the pump shell when the engine oil pump runs, and the deviation of the outer rotor caused by the overlarge width of the notch groove is avoided.
In the rotor structure of the oil pump, the ratio of the depth dimension of the notch groove along the axial direction of the outer rotor to the axial height dimension of the outer rotor is 1: 6-1: 10. The proportion range of the axial depth dimension of the notch groove along the outer rotor to the axial height dimension of the outer rotor is 1: 6-1: 10, so that the size of the cross section of the notch groove is favorably controlled within a reasonable range, the oil pumping efficiency is improved, the excessive influence of centrifugal action on engine oil suction is avoided, and the optimal performance of the oil pump is ensured.
In the rotor structure of the oil pump, the two end faces of the outer rotor are provided with the notch grooves, and the notch grooves are uniformly arranged along the circumferential direction of the outer rotor. The two end faces of the outer rotor are provided with the notch grooves, so that the inner wall of the pump shell, which is just opposite to the two end faces of the outer rotor, can obtain a good lubricating effect, the rotating resistance of the outer rotor is greatly reduced, and the friction loss between the outer rotor and the pump shell is reduced.
In the rotor structure of the oil pump, the plurality of notch grooves are formed along the radial direction of the outer rotor, and the number of the notch grooves on any end face of the outer rotor is consistent with that of the arc-shaped tooth grooves. The gap grooves are formed along the radial direction of the outer rotor, so that the flow stroke of engine oil is favorably reduced, the process is simplified, the number of the gap grooves on any end face of the outer rotor is consistent with that of the arc-shaped tooth grooves, the better oil pumping efficiency is guaranteed, the symmetry and the uniformity of the structure of the outer rotor are favorably realized, and the friction loss of the outer rotor caused by self unbalance loading is reduced.
In the rotor structure of the oil pump, the joint between the two side walls of the notch groove in the width direction and the end surface of the outer rotor is subjected to fillet transition treatment. The joint of the two side walls of the notch groove in the width direction and the end face of the outer rotor is subjected to fillet transition treatment, so that the probability of abrasion between the edge of the notch groove and the uneven part of the inner wall of the pump shell when the outer rotor jumps is reduced.
In the rotor structure of the oil pump, the pump case comprises a casing and a pump cover which are mutually buckled, the casing is provided with a rotor mounting seat, the outer rotor is rotatably embedded in the rotor mounting seat, and two end surfaces of the outer rotor are respectively attached to the bottom surface of the rotor mounting seat and the pump cover. The pump shell comprises the shell and the pump cover which are mutually buckled, the rotor mounting seat is arranged on the shell, the outer rotor is rotatably embedded in the rotor mounting seat, and the maintenance and the assembly of the outer rotor and the inner rotor are facilitated.
In the rotor structure of the oil pump, the oil inlet groove and the oil outlet groove are formed in the housing and the pump cover. All set up oil feed tank and oil outlet tank on casing and pump cover, guarantee sufficient oil feed like this and the cross-section of producing oil, do benefit to and guarantee higher pump oil efficiency.
Compared with the prior art, the invention has the following advantages:
the rotor structure of the oil pump is provided with the notch groove extending from the outer peripheral surface of the outer rotor to the side wall of the inner cavity of the outer rotor through the end surface of the outer rotor, so that when the oil pump works, when the notch groove is communicated with the oil inlet groove or the oil outlet groove, engine oil can flow in or be discharged through the notch groove, the efficiency of engine oil inlet and outlet is increased, in addition, the engine oil can store a certain amount in the notch groove while entering and exiting an oil storage gap between the outer rotor and the inner rotor, and the volume of the notch groove can not change along with the rotation of the outer rotor, so that the engine oil in the notch groove can continuously smear the engine oil in an annular region of the joint friction between the end surface of the outer rotor and the pump shell when the outer rotor rotates, and a stable and durable lubricating oil film is formed at the joint between the outer rotor and the.
Drawings
Fig. 1 is an exploded view of a rotor structure of a local oil pump.
Fig. 2 is a schematic front view of a rotor structure of the engine oil pump without a pump cover.
Fig. 3 is an enlarged view of a portion a in fig. 2.
Fig. 4 is a schematic view of a sectional structure B-B in fig. 2.
Fig. 5 is a schematic perspective view of the outer rotor and the inner rotor.
In the drawings, 1, a pump casing; 11. a housing; 12. a pump cover; 13. a rotor mounting seat;
2. an outer rotor; 21. a notch groove; 22. an arc-shaped tooth socket;
3. an inner rotor; 4. an oil inlet groove; 5. an oil outlet groove; 6. the pump oil chamber.
Detailed Description
The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.
As shown in fig. 1-5, the rotor structure of the present oil pump includes a pump housing 1, an annular outer rotor 2 and an inner rotor 3, the outer rotor 2 is eccentrically sleeved on the outer periphery of the inner rotor 3 and forms a plurality of pump oil chambers 6 therebetween, the inner wall of the pump housing 1 has an oil inlet tank 4 and an oil outlet tank 5 which are separated, the oil inlet tank 4 and the oil outlet tank 5 are respectively communicated with different pump oil chambers 6, specifically, the pump housing 1 includes a housing 11 and a pump cover 12 which are fastened with each other, the housing 11 has a rotor mounting base 13, the outer rotor 2 is rotatably embedded in the rotor mounting base 13, and two end faces of the outer rotor 2 are respectively attached to the bottom surface of the rotor mounting base 13 and the pump cover 12. Through setting up casing 1 including casing 11 and pump cover 12 of mutual lock, set up rotor mount pad 13 on casing 11, make outer rotor 2 rotate to inlay establish with rotor mount pad 13 in, make pump case 1 be split type design like this, do benefit to the maintenance and the assembly of outer rotor 2 and inner rotor 3. Both the housing 11 and the pump cover 12 have an oil inlet groove 4 and an oil outlet groove 5 (the oil inlet groove and the oil outlet groove on the pump cover are not shown). All set up oil feed tank 4 and play oil groove 5 on casing 11 and pump cover 12, guarantee sufficient oil feed like this and produce the oil cross-section, do benefit to and guarantee higher pump oil efficiency. The end face of the outer rotor 2 has a notch groove 21 extending from the outer peripheral surface of the outer rotor 2 to the inner cavity side wall of the outer rotor 2, and the notch groove 21 can communicate with the pump oil chamber 6 when the outer rotor 2 rotates. The pump shell 1 is an outer protection shell 11 of the oil pump and forms a closed environment for the work of the oil pump, the outer rotor 2 is rotationally matched in the pump shell 1, the side wall of the inner cavity of the outer rotor 2 is meshed and matched with the inner rotor 3 which can be driven by an engine, when the inner rotor 3 rotates, the outer rotor 2 eccentrically arranged with the inner rotor 3 can be driven to rotate, oil suction and pumping effects are generated by utilizing the change of a fit clearance between the two, the inner walls of the pump shell 1 and the two end faces of the outer rotor 2 can be attached to ensure that an oil storage clearance between the outer rotor 2 and the inner rotor 3 is sealed and stable, the inner wall of the pump shell 1 is provided with an oil inlet tank 4 and an oil outlet tank 5, the oil inlet tank 4 is communicated with the oil storage clearance with an increasing trend between the outer rotor 2 and the inner rotor 3, and the oil outlet tank 5 is communicated with the oil storage clearance with a decreasing trend between the outer rotor 2 and the inner rotor 3, so that the low-pressure engine oil in the oil inlet. The end face of the outer rotor 2 is provided with the notch groove 21 extending from the peripheral face of the outer rotor 2 to the side wall of the inner cavity of the outer rotor 2, so that when the oil pump works, when the notch groove 21 is communicated with the oil inlet groove 4 or the oil outlet groove 5, engine oil can be flushed or discharged through the notch groove 21, the efficiency of engine oil inlet and outlet is increased, in addition, certain amount of engine oil can be stored in the notch groove 21 when the engine oil enters or exits an oil storage gap between the outer rotor 2 and the inner rotor 3, the volume of the notch groove 21 can not change along with the rotation of the outer rotor 2, the notch groove 21 can be just sealed with the inner side wall of the rotor mounting seat 13 except the communication with the oil inlet groove 4 or the oil outlet groove 5 in the rotation process, the engine oil can be prevented from being discharged when the outer rotor 2 rotates, and can be continuously smeared on the annular area of the end face of the outer rotor 2, which is, and a stable and durable lubricating oil film is formed at the joint of the outer rotor 2 and the inner wall of the pump shell 1 to effectively reduce the abrasion between the end surface of the outer rotor 2 and the inner wall of the pump shell. Both end surfaces of the outer rotor 2 are provided with notch grooves 21, and a plurality of notch grooves 21 are uniformly arranged along the circumferential direction of the outer rotor 2. The two end faces of the outer rotor 2 are provided with the notch grooves 21, so that the inner wall of the pump shell 1, which is just opposite to the two end faces of the outer rotor 2, can be well lubricated, the rotation resistance of the outer rotor 2 is greatly reduced, and the friction loss between the outer rotor and the pump shell 1 is reduced. Further, eleven notch grooves 21 are respectively formed in two end faces of the outer rotor 2 and are arranged at intervals along the circumferential direction of the outer rotor 2, and when the outer rotor 2 rotates, the oil inlet groove 4 and the oil outlet groove 5 can be respectively communicated with the pump oil chamber 6 in the corresponding range through at least one notch groove 21. Through setting up eleven breach groove 21 along the circumference interval of external rotor 2, and oil inlet tank 4 and oil outlet tank 5 are linked together through at least one breach groove 21 and corresponding pump oil pocket 6 respectively when making external rotor 2 rotate, eleven breach grooves 21 can improve the frequency of paining to 1 inner wall of pump case with the contact of external rotor 2 terminal surface like this, make the machine oil of 1 inner wall of pump case because of friction consumption can in time supply in order to guarantee that the oil film lasts stably, in addition still guarantee all the time that oil inlet process and oil outlet process have breach groove 21 to participate in, make the machine oil in breach groove 21 be in the state of dynamic replenishment when improving whole working process pump oil efficiency, further guarantee to paint the lubrication effect. Correspondingly, the side wall of the inner cavity of the outer rotor 2 is provided with eleven arc-shaped tooth grooves 22 which are used for being meshed with the inner rotor 3 and pumping oil, the peripheral surface of the inner rotor 3 is provided with ten convex teeth, and one end of the gap groove 21 close to the side wall of the inner cavity of the outer rotor 2 is positioned at the arc top of the arc-shaped tooth grooves 22. The arc-shaped tooth grooves 22 are formed in the side wall of the inner cavity of the outer rotor 2, the arc-shaped tooth grooves 22 can be meshed with tooth heads on the outer peripheral surface of the inner rotor 3 to pump oil, the gap grooves 21 are formed in the arc top positions of the arc-shaped tooth grooves at one end, facing the inner cavity of the outer rotor 2, one end, facing the inner rotor 3, of the gap grooves 21, so that engine oil entering the space between the outer rotor 2 and the inner rotor 3 just faces the maximum width position of the gap between the corresponding arc-shaped tooth grooves 22 and the inner rotor 3, the gap is filled or discharged as soon as possible, the volume ratio of the engine oil pump under a high rotating speed condition is improved, in addition, the maximum attaching size of the end face of the outer rotor 2 and the inner wall of the pump shell 1. The notch groove 21 is opened in the radial direction of the outer rotor 2. The arrangement of the notch grooves 21 along the radial direction of the outer rotor 2 is favorable for reducing the flow stroke of engine oil and simplifying the process, so that the quantity of the notch grooves 21 on any end face of the outer rotor 2 is consistent with that of the arc-shaped tooth grooves 22, the better oil pumping efficiency is ensured, the structural symmetry and uniformity of the outer rotor 2 are also favorable for realizing, and the friction loss of the outer rotor 2 caused by self unbalance loading is reduced. Preferably, the ratio of the width of the notch groove 21 in the circumferential direction of the outer rotor 2 to the width of the corresponding arcuate slot 22 is 1: 2.5. By setting the ratio of the width dimension of the notch groove 21 to the width dimension of the arc-shaped tooth groove 22 to be 1:2.5, the engine oil in the notch groove 21 can provide continuous and stable lubrication for the inner wall of the pump shell 1 when the engine oil pump runs, and the outer rotor 2 is prevented from deflecting due to the fact that the width of the notch groove 21 is too large. Further, the ratio 7 of the depth dimension of the notch groove 21 in the axial direction of the outer rotor 2 to the axial height dimension of the outer rotor 2 is set to 1: 7. The ratio 7 of the axial depth dimension of the outer rotor 2 to the axial height dimension of the outer rotor 2 of the notch groove 21 is 1:7, so that the size of the cross section of the notch groove 21 is favorably controlled within a reasonable range, the oil pumping efficiency is improved, the excessive influence of centrifugal action on engine oil suction is avoided, and the optimal performance of the oil pump is ensured.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Claims (10)
1. The utility model provides an oil pump's rotor structure, includes pump case (1) and rotates to inlay and locate inner rotor (3) and outer rotor (2) of (1) in the pump case, outer rotor (2) cover is located form a plurality of pump oil pockets (6) between the periphery of inner rotor (3) and the inner chamber lateral wall of this outer rotor (2) can and the outer peripheral face of this inner rotor (3), the both ends face homoenergetic of this outer rotor (2) with the pump case (1) inside wall pastes and leans on, its characterized in that, the terminal surface of outer rotor (2) has the breach groove (21) that extend to this outer rotor (2) inner chamber lateral wall from the outer peripheral face of this outer rotor (2), works as when outer rotor (2) rotate breach groove (21) can with pump oil pocket (6) are linked together.
2. The rotor structure of the oil pump according to claim 1, wherein the plurality of the notch grooves (21) are arranged at intervals along the circumferential direction of the outer rotor (2), the inner wall of the pump housing (1) has an oil inlet groove (4) and an oil outlet groove (5) which are separated, the oil inlet groove (4) can be communicated with the corresponding pump oil chamber (6) through at least one of the notch grooves (21) when the outer rotor (2) rotates, and the oil outlet groove (5) can be communicated with the corresponding pump oil chamber (6) through at least one of the notch grooves (21).
3. The rotor structure of the oil pump according to claim 1 or 2, characterized in that the inner cavity side wall of the outer rotor (2) is provided with a plurality of arc-shaped tooth grooves (22) for engaging with the inner rotor (3) and pumping oil, and one end of the notch groove (21) close to the inner cavity side wall of the outer rotor (2) is positioned at the arc top of the arc-shaped tooth grooves (22).
4. The oil pump rotor structure according to claim 3, wherein the ratio of the width dimension of the notch groove (21) in the circumferential direction of the outer rotor (2) to the width dimension of the corresponding arc-shaped tooth groove (22) is in a range of 1:2 to 1: 6.
5. The oil pump rotor structure according to claim 4, wherein a ratio of a depth dimension of the notch groove (21) in an axial direction of the outer rotor (2) to an axial height dimension of the outer rotor (2) is in a range of 1:6 to 1: 10.
6. The rotor structure of an oil pump according to claim 1 or 2, wherein both end faces of the outer rotor (2) have the cutaway grooves (21), and a plurality of the cutaway grooves (21) are uniformly arranged in a circumferential direction of the outer rotor (2).
7. The rotor structure of the oil pump according to claim 6, characterized in that a plurality of the notch grooves (21) are formed along the radial direction of the outer rotor (2), and the number of the notch grooves (21) on any end surface of the outer rotor (2) is the same as the number of the arc-shaped tooth grooves (22).
8. The rotor structure of the oil pump according to claim 1 or 2, wherein the joints between the two side walls of the notch groove (21) in the width direction and the end surface of the outer rotor (2) are subjected to round corner transition treatment.
9. The rotor structure of the oil pump according to claim 1 or 2, wherein the pump housing (1) includes a housing (11) and a pump cover (12) that are fastened to each other, the housing (11) has a rotor mounting seat (13), the outer rotor (2) is rotatably embedded in the rotor mounting seat (13), and two end faces of the outer rotor (2) are respectively attached to the bottom face of the rotor mounting seat (13) and the pump cover (12).
10. The rotor structure of an oil pump according to claim 9, characterized in that the oil inlet groove (4) and the oil outlet groove (5) are provided on both the housing (11) and the pump cover (12).
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| CN202010886922.2A CN112013262B (en) | 2020-08-28 | 2020-08-28 | Rotor structure of oil pump |
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| CN112013262B (en) | 2021-10-22 |
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