CN109373167B - Oil pump with double oil outlet channel structure - Google Patents
Oil pump with double oil outlet channel structure Download PDFInfo
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- CN109373167B CN109373167B CN201811557443.5A CN201811557443A CN109373167B CN 109373167 B CN109373167 B CN 109373167B CN 201811557443 A CN201811557443 A CN 201811557443A CN 109373167 B CN109373167 B CN 109373167B
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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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Abstract
The invention discloses an oil pump with a double oil outlet channel structure, which is a rotor type oil pump. The oil pump is provided with two oil outlet channels. The surface occupied by the clearance between two adjacent meshing points of the inner rotor and the outer rotor is a containing surface. Firstly, determining the position of a maximum containing surface and sequentially determining meshing points at two ends of the maximum containing surface as a point a and a point b along the rotation direction of the rotor; when the ratio of the area of the containing surface to the area of the maximum containing surface is the same as the ratio of the oil discharge amount of the second oil outlet channel to the total oil discharge amount, meshing points at two ends of the containing surface are sequentially determined as a point c and a point d along the rotation direction of the rotor; determining the position of the minimum containing surface and sequentially determining meshing points at two ends of the minimum containing surface as a point f and a point g along the rotation direction of the rotor; the first oil outlet channel is located between points b and c, and the second oil outlet channel is located between points d and f. The oil pump is provided with two oil outlet channels, and the oil pump is simple and convenient in structure, reliable in performance and easy to machine. The oil outlet proportion of the two oil outlet channels is set arbitrarily by the method.
Description
Technical Field
The invention belongs to the technical field of hydraulic system flow control, and particularly relates to an oil pump with a double-oil-channel structure.
Background
In the machining and manufacturing industries of oil pumps of motorcycles and automobile engines at home and abroad at present, the oil inlet channel and the oil outlet channel in the oil pump have various structural forms, but are basically single channels, namely only one channel oil inlet channel and one channel oil outlet channel. If a plurality of oil inlet passages and oil outlet passages are needed and the flow of each oil outlet passage is regulated, the compound oil pump of a plurality of rotor sets is generally required to be designed; each rotor set may have an independent or common oil inlet passage, while the oil discharge passages are independent of each other. The combined type oil pump has the advantages of complex structure, high precision requirement, large manufacturing and processing difficulty and high cost. Therefore, it is necessary to design an oil pump with a structure of single rotor set and double oil ducts, which has the advantages of simple structure, reliable performance, easy processing, etc.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the oil pump with the double oil outlet channel structure, the oil pump is only provided with one group of rotor set and two oil outlet channels, and the oil outlet proportion of the two oil outlet channels can be set according to the requirement.
In order to achieve the above purpose, the solution adopted by the invention is as follows: an oil pump with a double-oil-channel structure is a rotor type oil pump and comprises a pump body, an inner rotor and an outer rotor; a rotor chamber is arranged in the pump body, the outer rotor is accommodated in the rotor chamber, and the inner rotor is accommodated in the outer rotor; the inner rotor and the outer rotor are tightly attached to the end face of the rotor chamber; the pump body is provided with an oil inlet channel and an oil outlet channel on the end surface of the rotor chamber, the oil pump is provided with two oil outlet channels, and the position of the oil inlet channel and the position of the oil outlet channel of the oil pump are determined by the following method:
the surface occupied by the gap between two adjacent meshing points of the inner rotor and the outer rotor is a containing surface, and the area of the containing surface changes along with the rotation of the rotor; selecting a point at the bottom of a valley of the outer rotor tooth profile as an M point, and selecting a point at the bottom of a valley of the inner rotor tooth profile as an N point; when M point, N point and the rotating center O of the inner rotor1And the rotating center O of the outer rotor2When the two points are collinear, the area of a containing surface between the M point and the N point is the largest, and meshing points at two ends of the largest containing surface are sequentially determined as a point a and a point b along the rotation direction of the rotor;
calculating the area change condition of the containing surface in the rotation process of the rotor, and determining the position of the containing surface when the ratio of the area of the containing surface to the area of the maximum containing surface is the same as the ratio of the oil discharge amount of the second oil outlet channel to the total oil discharge amount; meshing points at two ends of the containing surface are sequentially determined as a point c and a point d along the rotation direction of the rotor;
when the M point rotates 180 degrees, namely the M point rotates to the O point for the first time1And O2When the two points are collinear, the meshing points at the two ends of the containing surface where the M point is located are sequentially determined as a point f and a point g along the rotating direction of the rotor;
from O1The points are respectively connected with a point a, a point b, a point c, a point d, a point f and a point g and are extended to be intersected with an inner rotor tooth root circle and an outer rotor tooth root circle; bO1、cO1The position enclosed by the inner rotor tooth root circle and the outer rotor tooth root circle is the setting position of the first oil outlet channel; dO1、fO1The position enclosed by the inner rotor tooth root circle and the outer rotor tooth root circle is the setting position of the second oil outlet channel; gO1、aO1And the position enclosed by the inner rotor tooth root circle and the outer rotor tooth root circle is the setting position of the oil inlet channel.
Further, the area change condition of the containing surface in the rotation process of the rotor is calculated and measured by a drawing software query tool.
Furthermore, the number of teeth of an inner rotor of the oil pump is 10, the number of teeth of an outer rotor of the oil pump is 11, and the rotation of the inner rotor of the oil pumpCircle center O1And the rotating center O of the outer rotor2One eccentricity e of the distance is 1.89 mm.
The invention has the beneficial effects that: the oil pump is a traditional rotor type oil pump, is provided with two oil outlet channels, and has the advantages of simple and convenient structure, reliable performance and easy processing. Meanwhile, the positions of two oil outlets of the oil pump are determined according to the size change condition of a containing surface between the inner rotor and the outer rotor in the rotation process of the rotor. Namely, after the inner rotor and the outer rotor rotate and pass through the positions of the two oil outlet channels, the proportion of the area change of the containing surface between the inner rotor and the outer rotor is equal to the proportion of the oil outlet amount of each of the two oil outlet channels. The positions of the two oil outlets determined by the method can ensure the oil outlet ratio of the two oil outlets. Because the change of the containing surface between the inner rotor and the outer rotor has continuity, the oil outlet proportion of the two oil outlet channels can be set at will by the method.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
FIG. 2 is a schematic view of a maximum containing plane.
FIG. 3 shows the containing plane A between the M point and the N point0Schematic representation of (c).
FIG. 4 is a schematic view of a containment plane being a minimum containment plane.
In the drawings: 100. a pump body; 110. an oil inlet channel; 120. an oil inlet hole; 130. a first oil outlet channel; 140. an oil outlet hole; 150. a second oil outlet channel; 200. an outer rotor; 300. an inner rotor; 400. a drive shaft.
Detailed Description
The invention is further described below with reference to the accompanying drawings:
the present embodiment provides an oil pump with a dual oil outlet channel structure, as shown in fig. 1 to 4, which is a common rotor type oil pump. The engine oil pump comprises a pump body 100, an inner rotor 300, an outer rotor 200 and a transmission shaft 400; the pump body 100 is provided therein with a rotor chamber, which is a cylindrical cavity. The outer rotor 200 is accommodated in the rotor chamber. The outer rotor 200 is provided with internal teeth, the number Z of which211 inner rotors 300Is arranged in the outer rotor 200; the inner rotor 300 is provided with external teeth, the number Z thereof110, and the inner rotor 300 and the outer rotor 200 are engaged. The diameter of the outer rotor 200 is equal to the diameter of the rotor chamber, after the inner rotor 300 and the outer rotor 200 are accommodated in the rotor chamber, the side wall of the outer rotor 200 is tightly attached to the side wall of the rotor chamber, i.e. the outer rotor 200 and the rotor chamber are concentric to the center O2(ii) a Meanwhile, both surfaces of the inner rotor 300 and the outer rotor 200 are closely attached to both end surfaces of the rotor chamber. Inner rotor 300 centre of a circle O1 A drive shaft 400 is connected, the drive shaft 400 passing through the end surface of the rotor chamber and extending to the outside of the pump body 100. Inner rotor 300 centre of a circle O1At the center O of outer rotor 2002An eccentricity e of 1.89mm between them. The tooth shape of the inner rotor 300 is designed by adopting a short arc epicycloid equidistant line, and the tooth shape of the outer transmission is designed by adopting a three-arc modified line. When the rotor is in a working state, the teeth of the inner rotor 300 and the outer rotor 200 are always in a meshing state, and the occupied surface of the gap between two adjacent meshing points is a containing surface. The common normal line of each meshing point of the inner rotor 300 and the outer rotor 200 constantly passes through the node P. P point is pitch circle and O1、O2Intersection of connecting lines, pitch radius R ═ Z1E, the center of the pitch circle is O1. One end face of the rotor chamber of the pump body 100 is provided with an oil inlet passage 110 and two oil outlet passages, and the oil inlet passage 110 and the oil outlet passages respectively cover partial areas between two rotor tooth root circles, namely the oil inlet passage 110 and the oil outlet passages respectively cover partial containing faces. The pump body 100 is further provided with an oil inlet hole 120 and two oil outlet holes 140, the oil inlet hole 120 is connected with the oil inlet passage 110, and the two oil outlet holes 140 are respectively connected with one oil outlet passage.
When the transmission shaft is used, the transmission shaft 400 is driven by the outside to rotate to drive the inner rotor 300 to rotate, the outer rotor 200 also rotates, and the rotation angular speed ratio of the inner rotor to the outer rotor is in inverse proportion to the transmission ratio of the inner rotor to the outer rotor, namely phi1/φ2＝Z2/Z1. The area of the containing surface is changed continuously in the rotating process. At this time, the area of part of the containing surface gradually increases to form a negative pressure, which is the position where the oil inlet passage 110 is arranged; due to the negative pressure, the engine oil is continuously sucked into the oil inlet 120 and enters the containing surface through the oil inlet 110. Meanwhile, the area of part of the containing surface is gradually reduced, namely the oil outlet channel is arrangedA location; the oil is continuously squeezed out of the containing surface and discharged through the oil outlet passage and the oil outlet hole 140.
The oil pump of the invention is provided with two oil outlet channels for the traditional rotor type oil pump, and has the advantages of simple structure, reliable performance and easy processing.
In order to make the oil outlet ratio of the two oil outlet passages meet the preset ratio of 7:13, namely the oil outlet amount of the two oil outlet passages is 35% and 65%, the positions of the oil inlet passage 110 and the two oil outlet passages are determined by the following method.
The area of the containing surface between two adjacent meshing points of the inner rotor 300 and the outer rotor 200 of the rotor type oil pump is changed along with the rotation of the rotor. Selecting a point at the bottom of the outer rotor 200 tooth profile valley as an M point, and selecting a point at the bottom of the inner rotor 300 tooth profile valley as an N point; the M point and the N point are used as reference points when the inner rotor and the outer rotor rotate according to the transmission ratio; when M point, N point, the rotation center O of the inner rotor 3001And a rotation center O of the outer rotor 2002And when the two points are collinear, the area of a containing surface between the M point and the N point is the largest, and meshing points at two ends of the largest containing surface are sequentially determined as a point a and a point b along the rotation direction of the rotor.
The maximum area Amax of the containing surface is calculated according to the set parameters of the oil pump, the specific numerical value of the containing area between two adjacent meshing points is difficult to accurately calculate, but a graph with the meshing ratio of 1 to 1 of the inner rotor and the outer rotor 200 can be drawn, and the Amax is measured by a drawing software query tool, namely the Amax is calculated to be 48.85mm by CAXA software2。
Calculating the area change condition of the containing surface in the rotation process of the rotor, and determining the position of the containing surface when the ratio of the area of the containing surface between the M point and the N point to the area of the maximum containing surface is the same as the ratio of the oil discharge amount of the second oil outlet channel 150 to the total oil discharge amount; and meshing points at two ends of a containing surface between the M point and the N point are sequentially determined as a point c and a point d along the rotation direction of the rotor.
When the contained area A between two meshing points between the M point and the N point0Is 31.8mm2At the same time, 31.8mm2And 48.85mm2The ratio of (1) is equal to about 0.65, and when the rotation angle of the inner rotor 300 is 77 degrees calculated according to CAXA software, the rotation angle of the outer rotor 200 is 70 degrees. I.e. N point turnsWhen the dynamic angle is 77 degrees, the rotation angle of the M point is 70 degrees. At this time, the meshing points at both ends of the containing surface between the points M and N are sequentially determined as points c and d in the direction of rotation of the rotor.
When the rotation angle of the inner rotor 300 is 198 degrees and the M point rotates 180 degrees, namely the rotation angle of the N point is 198 degrees and the rotation angle of the M point is 180 degrees, the M point rotates to the position O for the first time1And O2And on the same line, the meshing points at the two ends of the containing surface where the M point is located are sequentially determined as a point f and a point g along the rotating direction of the rotor. At this time, the containing area Amin between two adjacent meshing points is 0.76mm2。
From O1The points are respectively connected with a point a, a point b, a point c, a point d, a point f and a point g and are extended to be connected with an inner and outer moon dental floss Ro1And Ro2And intersecting and shearing to form an oil inlet channel and two oil discharge channels. Inner crescent line Ro1Is a tooth root circle of an inner rotor, a crescent dental floss Ro2Is the tooth root circle of the outer rotor. bO1、cO1The position enclosed by the inner rotor tooth root circle and the outer rotor tooth root circle is the setting position of the first oil outlet channel; dO1、fO1The position enclosed by the inner rotor tooth root circle and the outer rotor tooth root circle is the setting position of the second oil outlet channel; gO1、aO1And the position enclosed by the inner rotor tooth root circle and the outer rotor tooth root circle is the setting position of the oil inlet channel. At the same time, aO1And bO1An oil sealing surface is formed between the oil inlet passage 110 and the first oil outlet passage 130; fO1And gO1An oil sealing surface is formed between the first oil outlet channel 130 and the second oil outlet channel 150, and the first oil outlet channel and the second oil outlet channel are separated; cO1And dO1Forming an oil seal surface therebetween and separating the second oil outlet passage 150 from the oil inlet passage 110.
The positions of the oil inlet passage 110 and the two oil outlet passages are determined by the method. In the operation of the oil pump, gO1And aO1The oil inlet passage 110 therebetween continuously absorbs oil and the oil absorption at the maximum containing surface reaches the maximum. As the rotor rotates, when the containing surface between the M point and the N point is coincident with the maximum containing surface, the rotor rotates to extrude the oil from the first oil outlet channel 130 until the area of the containing surface between the M point and the N point is A0. Due to the thickness of the inner 300 and outer 200 rotorsAnd the flow ratio of the oil discharge channel 1 to the oil discharge channel 2 is independent of the height of the rotor and the rotating speed of the oil pump, and is only dependent on the positions of the two oil passages. At this time, the decrease of the area of the containing surface between the M point and the N point with respect to the area of the maximum containing surface was 48.85mm2-31.8mm2＝17.05mm2. The reduced amount is the oil output of the first oil outlet channel 130, and the proportion of the total flow is as follows: 17.05mm2/48.85mm235%. After the oil outlet of the first oil outlet channel 130 is finished, the rotor continues to rotate, and the oil outlet of the second oil outlet channel 150 is started until the area of the containing surface between the M point and the N point is Amin. At this point, the rotor has rotated past the bleachable region of the oil pump. Because Amin is extremely small, the oil outlet ratio of the two oil outlet channels is not influenced. I.e., the second oil outlet passage 150, the oil outlet amount is the remaining 65%. The rotor continues to rotate, and the above actions can be repeated.
The present embodiment illustrates the arrangement positions of the oil inlet passage 110 and the two oil outlet passages by taking the oil outlet ratio of the first oil outlet passage 130 and the second oil outlet passage 150 as an example of 7: 13. In practical use, the oil outlet ratio of the first oil outlet channel 130 and the second oil outlet channel 150 can be obtained according to the method, and the oil outlet ratio can be any other ratio.
The above-mentioned embodiments only express the specific embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention.
Claims (3)
1. An oil pump with a double oil outlet channel structure is a rotor type oil pump and comprises a pump body (100), an inner rotor (300) and an outer rotor (200); a rotor chamber is arranged in the pump body (100), the outer rotor (200) is accommodated in the rotor chamber, and the inner rotor (300) is accommodated in the outer rotor (200); the inner rotor (300) and the outer rotor (200) are tightly attached to the end face of the rotor chamber; the pump body (100) in rotor chamber terminal surface is provided with oil inlet way (110) and oil outlet way, characterized by: the oil pump is provided with two oil outlet channels, and the position of an oil inlet channel (110) and the position of the oil outlet channel of the oil pump are determined by the following method:
the surface occupied by the clearance between two adjacent meshing points of the inner rotor (300) and the outer rotor (200) is a containing surface, and the area of the containing surface changes along with the rotation of the rotor; selecting a point at the bottom of a tooth profile valley of the outer rotor (200) as an M point, and selecting a point at the bottom of a tooth profile valley of the inner rotor (300) as an N point; when M point, N point and the rotation center O of the inner rotor (300)1And the rotating center O of the outer rotor (200)2When the two points are collinear, the area of a containing surface between the M point and the N point is the largest, and meshing points at two ends of the largest containing surface are sequentially determined as a point a and a point b along the rotation direction of the rotor;
calculating the area change condition of the containing surface in the rotation process of the rotor, and determining the position of the containing surface when the ratio of the area of the containing surface to the area of the maximum containing surface is the same as the ratio of the oil discharge amount of the second oil outlet channel (150) to the total oil discharge amount; meshing points at two ends of the containing surface are sequentially determined as a point c and a point d along the rotation direction of the rotor;
when the M point rotates 180 degrees, namely the M point rotates to the O point for the first time1And O2When the two points are collinear, the meshing points at the two ends of the containing surface where the M point is located are sequentially determined as a point f and a point g along the rotating direction of the rotor;
from O1The points are respectively connected with a point a, a point b, a point c, a point d, a point f and a point g and are extended to be intersected with an inner rotor tooth root circle and an outer rotor tooth root circle; bO1、cO1The position enclosed by the inner rotor tooth root circle and the outer rotor tooth root circle is the setting position of the first oil outlet channel (130); dO1、fO1The position enclosed by the inner rotor tooth root circle and the outer rotor tooth root circle is the setting position of the second oil outlet channel (150); gO1、aO1The position enclosed by the inner rotor tooth root circle and the outer rotor tooth root circle is the setting position of the oil inlet channel (110).
2. The oil pump with a double oil outlet channel structure as claimed in claim 1, wherein: and calculating the area change condition of the containing surface in the rotation process of the rotor, and measuring the area change condition through a drawing software query tool.
3. The oil pump with a double oil outlet channel structure as claimed in claim 1, wherein: the oil pump is characterized in that the number of teeth of an inner rotor (300) of the oil pump is 10, the number of teeth of an outer rotor (200) of the oil pump is 11, and the center of a circle O of the inner rotor (300) of the oil pump is a rotation center1And the rotating center O of the outer rotor (200)2One eccentricity e of the distance is 1.89 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811557443.5A CN109373167B (en) | 2018-12-19 | 2018-12-19 | Oil pump with double oil outlet channel structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811557443.5A CN109373167B (en) | 2018-12-19 | 2018-12-19 | Oil pump with double oil outlet channel structure |
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| Publication Number | Publication Date |
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| CN109373167A CN109373167A (en) | 2019-02-22 |
| CN109373167B true CN109373167B (en) | 2020-06-09 |
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Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6220683A (en) * | 1985-07-19 | 1987-01-29 | Sumitomo Electric Ind Ltd | Rotary pump with low noise |
| US5813844A (en) * | 1995-12-14 | 1998-09-29 | Mitsubishi Materials Corporation | Oil pump rotor having a generated tooth shape |
| DE69721092T2 (en) * | 1996-01-19 | 2003-12-11 | Aisin Seiki | Oil pumping station |
| JP2003328959A (en) * | 2003-06-13 | 2003-11-19 | Hitachi Unisia Automotive Ltd | Oil pump |
| DE10350632A1 (en) * | 2003-10-29 | 2005-06-16 | Gkn Sinter Metals Gmbh | Double or multiple pump |
| JP4650180B2 (en) * | 2005-09-22 | 2011-03-16 | アイシン精機株式会社 | Oil pump rotor |
| DE102014222396A1 (en) * | 2014-11-03 | 2016-05-04 | Continental Automotive Gmbh | displacement |
| CN107208627B (en) * | 2015-01-30 | 2019-06-28 | 爱信机工株式会社 | Gear pump and its manufacturing method |
| JP6599181B2 (en) * | 2015-09-07 | 2019-10-30 | アイシン機工株式会社 | Gear pump |
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