Source: http://www.sumobrain.com/patents/wipo/Oil-pump-engine-cover-comprising/WO2013143479A1.html
Timestamp: 2020-01-22 11:23:47
Document Index: 338155746

Matched Legal Cases: ['art.\n11', 'art 11', 'art 11', 'art 11', 'art 11', 'art 11', 'art 422', 'art 423', 'art 422', 'art 422', 'art 423', 'art 422']

WIPO Patent Application WO/2013/143479
An oil pump is provided. The oil pump comprises a shell, a rotor mounting part (11) disposed at an end of the shell, and a rotor mechanism (2) disposed on the rotor mounting part (11). The shell has an inlet (161) and an outlet (162) and defines a low-pressure oil chamber (12) and a high-pressure oil chamber (13) therein. The high-pressure oil chamber (13) and the low-pressure oil chamber (12) are located at the same side of a periphery of the rotor mounting part (11) side by side. An engine cover comprising the oil pump and an engine comprising the engine cover are also provided.
LIU, Jing (No. 3009 BYD Road, PingshanShenzhen, Guangdong 8, 518118, CN)
ZHENG, Junli (No. 3009 BYD Road, PingshanShenzhen, Guangdong 8, 518118, CN)
LI, Haibin (No. 3009 BYD Road, PingshanShenzhen, Guangdong 8, 518118, CN)
LIN, Jinchen (No. 3009 BYD Road, PingshanShenzhen, Guangdong 8, 518118, CN)
CN2013/073358
SHENZHEN BYD AUTO R&D COMPANY LIMITED (Part B, 1/F Bldg#B2,Yucan Industrial Area,Lanzhu Road, Shenzhen Export Processing Zone, Shenzhen Grand Industrial Zon, Shenzhen Guangdong 8, 518118, CN)
BYD COMPANY LIMITED (No. 3009 BYD Road, PingshanShenzhen, Guangdong 8, 518118, CN)
F16N13/20; F01M1/02; F04C2/10; F16N13/00
CN201372923Y 2009-12-30
CN201066030Y 2008-05-28
US20070092392A1 2007-04-26
JP2000220578A 2000-08-08
CN102364205A 2012-02-29
US20080025851A1 2008-01-31
US4971528A 1990-11-20
See also references of EP 2831488A4
a shell having an inlet and an outlet and defining a low-pressure oil chamber and a high-pressure oil chamber therein, the low-pressure oil chamber having a low-pressure oil passage communicated with the inlet, the high-pressure oil chamber having a high-pressure oil passage communicated with the outlet,
a rotor mounting part disposed at an end of the shell and having a rotor supporting structure; and
a rotor mechanism disposed on the rotor mounting part,
wherein the high-pressure oil chamber and the low-pressure oil chamber are located at the same side of a periphery of the rotor mounting part side by side.
2. The oil pump according to claim 1, wherein a buffer chamber is defined between the low-pressure oil chamber and the high-pressure oil chamber,
wherein the buffer chamber, the high-pressure oil chamber and the low-pressure oil chamber are located at the same side of a periphery of the rotor mounting part side by side.
3. The oil pump according to claim 2, further comprising a flow limiting wall disposed in the buffer chamber,
wherein the flow limiting wall divides the buffer chamber into an inflowing buffer chamber and an outflowing buffer chamber communicated with the inflowing buffer chamber via a pressure relief mechanism,
wherein a barrier wall is disposed between the outflowing buffer chamber and the low-pressure oil chamber.
4. The oil pump according to claim 3, wherein the shell comprises a main shell body and a cover jointed with the main shell body, the inlet and outlet formed in the cover,
wherein the flow limiting wall comprises a first flow limiting wall portion formed on the cover, and a second flow limiting wall portion formed on the main shell body, and
wherein a through hole communicating the inflowing buffer chamber and the outflowing buffer chamber is formed in the flow limiting wall, and the pressure relief mechanism is disposed in the through hole.
5. The oil pump according to claim 3, wherein the outflowing buffer chamber comprises a pressure relief channel adapted to change an outflowing direction,
wherein the pressure relief channel comprises first and second pressure relief ports disposed symmetrically with each other.
6. The oil pump according to claim 5, wherein the first and second pressure relief ports each has a right-angled trapezoid shaped cross-section.
7. The oil pump according to claim 3, further comprising a partition wall disposed between the low-pressure oil chamber and the high-pressure oil chamber for partitioning the low-pressure oil chamber and the high-pressure oil chamber.
8. The oil pump according to claim 7, wherein the partition wall comprises
a main body portion adjacent to the outlet; and
9. The oil pump according to claim 8, wherein a side of the extending portion facing to the high pressure oil chamber is inclined.
10. The oil pump according to claim 7, wherein the partition wall comprises a bolt hole formed at an end of the partition wall adjacent to the rotor mounting part.
11. The oil pump according to claim 10, wherein a width of the partition wall is 1.5 to 2 times of the maximum value of a diameter of the bolt hole.
12. The oil pump according to claim 3, wherein the barrier wall is disposed at a side of the inlet and parallel to an inflowing direction of an oil flowing into the low-pressure oil chamber through the inlet.
13. The oil pump according to claim 12, wherein a top end face of the barrier wall is a circular arc surface.
14. An engine cover, comprising:
an engine cover body; and
an oil pump according to any one of claims 1-13 and disposed on the engine cover body, the shell of the oil pump is integral with the engine cover.
15. An engine comprising an engine cover according to claim 14.
This application claims priority to and benefit of Chinese Patent Application Serial No. 201210087031.6, 201220124123.2, 201210087043.9, and 201220124135.5, all filed with the State Intellectual Property Office (SIPO) of P. R. China on March 29, 2012, the entire contents of which are incorporated herein by reference.
Generally, the oil pump of a vehicle engine is usually a rotor pump. The rotor pump comprises a shell, and inner and outer rotors eccentrically disposed in the shell. The shell comprises an inlet communicated with a low-pressure oil chamber, and an outlet communicated with a high-pressure oil chamber. When the engine is in operation, the inner rotor is driven to rotate with the outer rotor. With the rotation of the inner rotor and the outer rotor, the low-pressure oil injected through the inlet is transformed to high-pressure oil and then discharged from the outlet. However, in conventional oil pumps, the high-pressure oil chamber and the low-pressure oil chamber are usually disposed on the opposite sides, so that the structure of the oil pump is not compact and occupies a big space, which is disadvantageous for miniaturization of the oil pump as well as the engine having the oil pump.
This summary is provided to introduce a selection of concepts in a simplified form that are further described below in the Detailed Description. This summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter. In viewing thereof, the present disclosure is directed to solve at least one of the problems existing in the art. Accordingly, an oil pump is provided. The oil pump is compact in structure and occupies a small space.
Embodiments according to an aspect of the present disclosure provide an oil pump. The oil pump may comprise a shell, a rotor mounting part disposed at an end of the shell and a rotor mechanism disposed on the rotor mounting part. The shell has an inlet and an outlet and defines a low-pressure oil chamber and a high-pressure oil chamber therein. The low-pressure oil chamber has a low-pressure oil passage communicated with the inlet, and the high-pressure oil chamber has a high-pressure oil passage communicated with the outlet. The high-pressure oil chamber and the low-pressure oil chamber are located at the same side of a periphery of the rotor mounting part side by side. The rotor mounting part has a rotor supporting structure.
By providing the high-pressure oil chamber and the low-pressure oil chamber at the same side of the periphery of the rotor mounting part, the oil pump is compact in structure and occupies a small space, which is advantageous for miniaturization of the oil pump as well as the engine having the oil pump.
Additional aspects and advantages of embodiments of present disclosure will be given in part in the following descriptions, become apparent in part from the following descriptions, or be learned from the practice of the embodiments of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is a front cross-sectional view of a cover of the oil pump according to an embodiment of the present disclosure, in which the arrows shows a flowing direction of the oil; Fig. 2 is a front cross-sectional view of a shell of the oil pump according to an embodiment of the present disclosure;
As shown in Figs. 1-4, the oil pump according to an embodiment of the present disclosure comprises a shell 1, a rotor mounting part 11 disposed at an end of the shell 1, and a rotor mechanism 2 disposed on the rotor mounting part 11. The shell 1 has an inlet 161 and an outlet 162 and defines a low-pressure oil chamber 12 and a high-pressure oil chamber 13 therein. The low-pressure oil chamber 12 has a low-pressure oil passage 121 communicated with the inlet 161, and the high-pressure oil chamber 13 has a high-pressure oil passage 131 communicated with the outlet 162. The high-pressure oil chamber 13 and the low-pressure oil chamber 12 are located at the same side of a periphery of the rotor mounting part 11 side by side. The rotor mounting part 11 has a rotor supporting structure 111.
By providing the high-pressure oil chamber 13 and the low-pressure oil chamber 12 at the same side of the periphery of the rotor mounting part 11, the oil pump is compact in structure and occupies a small space, which is advantageous for miniaturization of the oil pump as well as the engine having the oil pump.
In some embodiments, the oil pump comprises a partition wall 3 disposed between the low-pressure oil chamber 12 and the high-pressure oil chamber 13 for partitioning and separating the low-pressure oil chamber 12 and the high-pressure oil chamber 13.
In some embodiments, a barrier wall 41 is disposed between the outflowing buffer chamber
141 and the low-pressure oil chamber 12.
The buffer chamber 14 in embodiments of the present disclosure is adapted for releasing the pressure of the oil in the high-pressure oil chamber 13. With the buffer chamber 14 defined between the high-pressure oil chamber 13 and the low-pressure oil chamber 12, when the oil pressure in the high-pressure oil chamber 13 reaches a predetermined pressure, a part of the high-pressure oil (also referred as pressure relief oil hereinafter) in the high-pressure oil chamber 13 flows into the low-pressure oil chamber 12, thus releasing the oil pressure in the high-pressure oil chamber 13. In addition, by providing the buffer chamber 14, the flowing direction of the pressure relief oil is changed and the flowing speed thereof is reduced, thus stabilizing flowing of the pressure relief oil. Further, with the barrier wall 41 disposed between the outflowing buffer chamber 141 and the low-pressure oil chamber 12, the pressure relief oil released from the inflowing buffer chamber 142 into outflowing buffer chamber 141 may flow along the barrier wall 41 smoothly and then enter into the low-pressure oil chamber 12, thus avoiding the unnecessary eddy generated by impacting of the pressure relief oil against the low-pressure oil entering the low-pressure oil chamber 12 through the inlet 161, so that the efficiency of the oil pump can be improved.
In some embodiments, the low-pressure oil passage 121 and the high-pressure oil passage
131 may be disposed in the cover 16.
In some embodiments, the flow limiting wall 42 may comprise a cover flow limiting wall part 422 and a body flow limiting wall part 423 jointed with the cover flow limiting wall part 422.
The cover flow limiting wall part 422 is formed on the cover 16, and the body flow limiting wall part 423 is formed on the main shell body 15. In some embodiments, the through hole 421 communicating the inflowing buffer chamber 142 and the outflowing buffer chamber 141 is formed in the cover flow limiting wall part 422, and the pressure relief mechanism 6 is disposed in the through hole 421.
Alternatively, a plurality of bolt holes may be formed in different positions around the outlet
162. In that way, the joining force between the first partition wall portion 31 and the second partition wall portion 32 may be more uniform. In addition, it is advantageous for isolation between the low-pressure and high-pressure oil chambers 12, 13, and the oil leakage may be further prevented.
In some embodiments, the rotor mechanism 2 comprises an inner rotor 21 and an outer rotor
22. The inner rotor 21 is mounted on a rotor shaft. As shown in Fig.4, a groove 211 is formed in the inner wall of the inner rotor 21, and the inner rotor 21 is mounted on the rotor shaft by a spline or a pin fitted in the groove 211. The outer rotor 22 and the inner rotor 21 may be eccentrically disposed relative to each other in the shell 1. The rotation of the inner rotor 21 drives the out rotor 22 to rotate. In an embodiment, the inner rotor 21 has seven teeth, and the outer rotor 22 has eight teeth. In that way, the inner rotor 21 driven by the rotor shaft may drive the outer rotor 22 to rotate in the same direction but not synchronized with the inner rotor 21. Those having ordinary skill in the art will appreciate that, by increasing the number of the teeth of the outer rotor 22, the oil pump is more compact in structure, the oil supplying amount is large, the oil supplying is uniform, the noise is reduced and the vacuum degree for pumping oil is increased. Thereby, a circular flowing of the oil in the lubricating system may be ensured. The tooth of each of the inner and outer rotors 21, 22 is designed to ensure that the inner and outer rotors 21, 22 are in constant point-contact when the inner and outer rotors 21, 22 rotate to any angle.
According to embodiments of the present disclosure, by provision of the partition wall 3, the high-pressure oil chamber 13 and the low-pressure oil chamber 12 are completely separated or isolated or partitioned with each other when the pressure relief valve 61 is closed. Thus, the pressure loss caused by oil leakage may be prevented, and the efficiency of oil pumping may be further improved. An engine cover according to embodiments of the present disclosure will be disclosed below.
The engine cover comprises an oil pump described with reference to the above embodiments. The engine cover comprises an engine cover body on which the shell 1 of the oil pump is integrally formed. By way of example, as shown in Fig.4, the engine cover such as a front cover of the engine comprises an engine cover body 5, and the shell 1 of the oil pump is integral with the engine cover body 5.
Next Patent: SOLAR BATTERY ASSEMBLY