CN211975181U - Engine cylinder lid fuel supply structure - Google Patents
Engine cylinder lid fuel supply structure Download PDFInfo
- Publication number
- CN211975181U CN211975181U CN202020441485.9U CN202020441485U CN211975181U CN 211975181 U CN211975181 U CN 211975181U CN 202020441485 U CN202020441485 U CN 202020441485U CN 211975181 U CN211975181 U CN 211975181U
- Authority
- CN
- China
- Prior art keywords
- oil
- engine
- pressure fuel
- cylinder head
- fuel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Fuel-Injection Apparatus (AREA)
Abstract
The utility model discloses an engine cylinder lid fuel supply structure, sprayer are installed in the engine, and the sprayer mounting hole has been seted up to the cylinder lid of engine, are equipped with low pressure fuel oil return chamber between the inner wall of sprayer and sprayer mounting hole, and the low pressure fuel oil-out of sprayer is located low pressure fuel oil return intracavity, sets up the low pressure fuel oil return way that is linked together with low pressure fuel oil return chamber on the cylinder lid. The oil injector is connected with an oil inlet pipe through a pipe joint device, and an internal leakage prevention oil discharge channel is arranged between the pipe joint device and the oil inlet pipe. A lip-shaped sealing ring is arranged between a connecting sleeve of the pipe joint device and a connecting sleeve mounting hole on the cylinder head cover. The utility model discloses an engine cylinder cover and fuel supply structure thereof, which can form a low-pressure fuel channel with reliable sealing in the cylinder cover, and avoid the leakage of low-pressure fuel; the leakage of high-pressure fuel oil can be reduced, and the high-pressure fuel oil can be prevented from being mixed with lubricating oil after being leaked.
Description
Technical Field
The utility model relates to an engine field especially relates to an engine cylinder lid fuel supply structure.
Background
The engine cylinder cover is mainly used for sealing the upper part of the cylinder to form a combustion chamber. An oil injector is usually mounted on the cylinder head, and the oil injector includes an oil injector body and an oil nozzle, wherein the oil nozzle is used for atomizing fuel oil and is distributed in the combustion chamber to mix with air, the oil injector body is provided with an oil inlet and an oil return hole, during operation, the oil tank supplies oil to the oil injector, the oil enters from the oil inlet on the oil injector body and enters into the cylinder through the oil injector, and the redundant oil flows back to the oil tank through the oil return hole.
The jacking side-return type electric control oil injector has the advantages of small volume, low cost, high reliability and the like due to the simple structures of the low-pressure fuel oil return structure and the high-pressure fuel oil inlet structure, and is widely applied to a high-pressure common rail engine.
However, the existing electronic fuel injector of the top-in side-return type is usually installed on a high-pressure common rail engine and has the following problems:
1) usually, an oil return rod (or called as a built-in oil return pipe) is connected to an oil injector body, and the oil return rod is connected with an external oil return pipe to achieve an oil return function. When the oil return rod is installed, the sealing problem often exists at the joint of the oil return rod and the oil injector body, the joint of the oil return rod and an external oil return pipe, and the positions between the oil return rod and an oil return rod installation hole formed in a cylinder cover, so that low-pressure fuel oil leakage is easily caused.
2) Because the volume of the electric control oil injector is small, when the electric control oil injector is arranged on a cylinder cover, the position of an oil inlet pipe interface is low, and the electric control oil injector is arranged in a narrow gap formed by moving parts such as a valve mechanism and the like, so that the electric control oil injector is difficult to install and seal, and high-pressure fuel oil is easy to leak;
3) the high-pressure fuel pressure of the top-inlet side-return type electric control fuel injector is up to 2000bar, high-pressure fuel leakage may occur at the connecting position of the fuel inlet pipe due to poor assembly or engine vibration and the like, and once the high-pressure fuel leaks into the engine, the high-pressure fuel is mixed with lubricating oil, so that the lubricating oil is deteriorated, and the engine is damaged.
SUMMERY OF THE UTILITY MODEL
Aiming at the defects in the prior art, the utility model discloses a fuel supply structure of an engine cylinder cover, which can form a low-pressure fuel channel with reliable sealing in the cylinder cover; reliable installation and sealing of a high-pressure fuel oil inlet pipeline can be provided; and can prevent the high-pressure fuel from being mixed with the lubricating oil after leaking.
The utility model discloses a solve above-mentioned technical problem, take following technical scheme:
an engine head fuel supply structure comprising: the fuel injector is mounted on an engine, a fuel injector mounting hole is formed in a cylinder cover of the engine, a low-pressure fuel oil return cavity is formed between the fuel injector and the inner wall of the fuel injector mounting hole, a low-pressure fuel oil outlet of the fuel injector is located in the low-pressure fuel oil return cavity, and a low-pressure fuel oil return channel communicated with the low-pressure fuel oil return cavity is formed in the cylinder cover.
Preferably, an oil injector bushing is further installed in the oil injector mounting hole, the oil injector bushing is arranged on the outer side of the lower portion of the oil injector, sealing rings are respectively arranged between the oil injector mounting hole and the oil injector and between the oil injector bushing and the oil injector mounting hole, and the low-pressure fuel oil return cavity is defined by the two sealing rings, the oil injector bushing and the oil injector mounting hole.
Preferably, the oil injector is connected with an oil inlet pipe through a pipe joint device, and an internal leakage prevention oil discharge channel is arranged between the pipe joint device and the oil inlet pipe.
Preferably, the pipe joint device includes: the connecting sleeve is in threaded connection with the oil injector;
the oil inlet pipe be provided with the evagination toper link that the sprayer is connected, annular cushion cover is located the oil inlet pipe is outside and be located the upper portion of evagination toper link, set up the oil inlet pipe mounting hole and the annular cushion mounting hole that are linked together in the link sleeve, the oil inlet pipe with be equipped with the erection gap between the oil inlet pipe mounting hole, set up on the annular cushion and prevent interior the oil extraction hole that leaks, prevent interior the oil extraction hole that leaks with the erection gap is linked together and is formed prevent interior the oil extraction passageway that leaks.
Preferably, a cylinder cover of the engine is provided with a connecting sleeve mounting hole matched with the connecting sleeve, and a lip-shaped sealing ring is mounted between the connecting sleeve and the connecting sleeve mounting hole.
Preferably, the bottom end face of the cylinder head cover is set to be an inclined end face, and the connecting sleeve mounting hole is located on the top face of the end with the lower inclined height of the cylinder head cover.
Preferably, a concave plane is arranged on the top surface of the end with the lower inclined height of the cylinder head cover, and the connecting sleeve mounting hole is formed in the concave plane.
Preferably, the included angle between the inclined end face and the horizontal plane is 5-15 degrees.
Preferably, the cylinder head is bolted to the cylinder head cover.
Preferably, a cylinder cover fence is arranged between the cylinder cover and the cylinder cover, the cylinder cover fence is connected with the cylinder cover through bolts, and the cylinder cover is connected with the cylinder cover fence through bolts.
Compared with the prior art, the beneficial effects of the utility model are that:
1) a low-pressure fuel oil return cavity is arranged between the oil injector and the inner wall of the oil injector mounting hole, a low-pressure fuel oil return passage communicated with the low-pressure fuel oil return cavity is formed in the cylinder cover, and the low-pressure fuel oil return cavity and the low-pressure fuel oil return passage form a low-pressure fuel oil passage together; during oil return, the use of an oil return rod is avoided, and further the problems of poor connection and unreliable sealing between the external oil return rod and the oil injector are avoided, so that a low-pressure fuel oil channel which is reliable in sealing can be formed inside the cylinder cover, and oil leakage of low-pressure fuel oil is avoided.
2) An oil inlet pipe mounting hole and an annular cushion block mounting hole which are communicated with each other are formed in the connecting sleeve, a mounting gap is formed between the oil inlet pipe and the oil inlet pipe mounting hole, an internal leakage prevention oil discharge hole is formed in the annular cushion block, and the internal leakage prevention oil discharge hole is communicated with the mounting gap to form an internal leakage prevention oil discharge channel. If high-pressure fuel oil leaks from the pipe joint device or the oil inlet pipe, the leaked high-pressure fuel oil can flow out of the cylinder head cover along the internal leakage prevention oil discharge channel from the channel, so that the mixing of the high-pressure fuel oil and lubricating oil is avoided.
3) The bottom terminal surface of cylinder head cover sets up to the slope terminal surface, not only can provide enough big installation space for the valve timing mechanism, can shorten the oil pipe moreover and stretch into the cylinder head cover internal distance and then shorten the length of adapter sleeve, has also reduced the distance between adapter sleeve and the lip seal to the lip seal slope that has reduced because of engine vibration arouses shifts, and then has avoided the not tight problem of lip seal sealing. In addition, a concave plane is arranged on the top surface of the lower end of the cylinder head cover in the inclined height, and the connecting sleeve mounting hole is formed in the concave plane, so that the distance between the connecting sleeve and the lip-shaped sealing ring is further shortened, and the sealing performance is improved.
To sum up, the fuel supply structure of the engine cylinder cover of the utility model can form a reliable sealed low-pressure fuel channel in the cylinder cover, thereby avoiding the low-pressure fuel from leaking, avoiding the use of a return rod and saving parts; reliable installation and sealing of the oil inlet pipeline can be provided, and the high-pressure fuel oil can be prevented from being mixed with the lubricating oil after being leaked.
Drawings
FIG. 1 is a schematic diagram of a fuel supply structure for an engine cylinder head according to the present invention;
FIG. 2 is a schematic top view of FIG. 1;
FIG. 3 is a partial cross-sectional view of Y-Y of FIG. 2;
FIG. 4 is a partial cross-sectional view taken at X-X in FIG. 2;
FIG. 5 is an enlarged view at I of FIG. 4;
in the figure: 1-cylinder cover, 11-oil injector mounting hole, 2-oil inlet pipe, 21-convex conical connecting end, 3-cylinder cover, 31-concave plane, 4-cylinder cover rail, 5-oil injector, 51-low-pressure fuel oil outlet, 6-oil injector bush, 7-sealing ring, 8-lip sealing ring, 9-pipe joint device, 91-annular cushion block, 910-internal leakage prevention oil drain hole, 92-connecting sleeve, 921-oil inlet pipe mounting hole, 922-annular cushion block mounting hole, A-low-pressure fuel oil return cavity and low-pressure fuel oil return channel B.
Detailed Description
The following detailed description of the embodiments of the present invention will be provided in conjunction with the accompanying drawings and specific embodiments for further understanding the objects, aspects and functions of the present invention, but not for limiting the scope of the appended claims.
As shown in fig. 1 to 5, the fuel injector is mounted on an engine, a cylinder head 1 of the engine is provided with a fuel injector mounting hole 11, a low-pressure fuel oil return cavity a is arranged between the fuel injector 5 and an inner wall of the fuel injector mounting hole 11, a low-pressure fuel oil outlet 51 of the fuel injector 5 is located in the low-pressure fuel oil return cavity a, and the cylinder head 1 is provided with a low-pressure fuel oil return channel B communicated with the low-pressure fuel oil return cavity a. The low-pressure fuel flows out from the low-pressure fuel outlet 51 of the fuel injector 5 and enters the low-pressure fuel return cavity a, and then flows out of the cylinder head from the low-pressure fuel return channel B (as indicated by the arrows and the dotted lines in fig. 5), and a low-pressure fuel pipe is connected outside the cylinder head to collect the flowing fuel. In this embodiment, the low pressure fuel return passage B is a straight hole in the cylinder head 1 in the lateral direction as shown in fig. 3. The low-pressure fuel oil return cavity A and the low-pressure fuel oil return channel B jointly form a low-pressure fuel oil channel, and a reliable-sealing low-pressure fuel oil channel can be formed in the cylinder cover without an oil return rod during oil return;
an oil injector bush 6 is further installed in the oil injector installation hole 11, the oil injector bush 6 is arranged on the outer side of the lower portion of the oil injector 5, sealing rings 7 are respectively arranged between the oil injector installation hole 11 and the oil injector 5 and between the oil injector bush 6, the sealing rings 7 are preferably O-shaped sealing rings, and as shown in fig. 3, a low-pressure fuel oil return cavity A is defined by the two sealing rings 7 arranged up and down, the oil injector 5, the oil injector bush 6 and the oil injector installation hole 11.
As shown in fig. 4 and 5, the fuel injector 5 is connected to the fuel inlet pipe 2 through a pipe joint device 9, and an internal leakage prevention and oil discharge passage is provided between the pipe joint device 9 and the fuel inlet pipe 2. As shown in fig. 5, the pipe joint device 9 includes: the connecting sleeve 92 is in threaded connection with the oil injector 5; the oil inlet pipe 2 is provided with a convex conical connecting end 21 connected with the oil sprayer 5, the annular cushion block 91 is sleeved outside the oil inlet pipe 2 and is located on the upper portion of the convex conical connecting end 21, an oil inlet pipe mounting hole 921 and an annular cushion block mounting hole 922 which are communicated are formed in the connecting sleeve 92, a mounting gap is formed between the oil inlet pipe 2 and the oil inlet pipe mounting hole 921, an oil discharge hole 910 which prevents internal leakage is formed in the annular cushion block 91, and the oil discharge hole 910 which prevents internal leakage is communicated with the mounting gap to form an oil discharge channel which prevents internal leakage. As shown in fig. 5, if high-pressure fuel once leaks from the interface of the male tapered connecting end 21 and the fuel injector 5, the leaked fuel will flow out along the internal-leakage-proof oil drain passage (i.e., indicated by the solid arrow in fig. 5) to the open space with lower pressure, i.e., outside the runner cylinder head cover 3, preventing the fuel from flowing into the cylinder head cover to be mixed with the lubricating oil.
As shown in fig. 3 and 4, a cylinder head cover 3 of the engine is provided with a connecting sleeve mounting hole adapted to the connecting sleeve 92, and a lip seal 8 is mounted between the connecting sleeve 92 and the connecting sleeve mounting hole. The bottom end face of the cylinder head cover 3 is set to be an inclined end face, and the connecting sleeve mounting hole is formed in the top face of the lower end of the cylinder head cover in the inclined height. The bottom terminal surface of cylinder head cover 3 sets up to the inclined end face, not only can provide enough big installation space for the valve actuating mechanism in the cylinder head cover 3, can shorten into oil pipe 2 moreover and stretch into the cylinder head cover internal distance and then shorten the length of adapter sleeve, improved the stability of adapter sleeve 92 installation, and reduced the distance between adapter sleeve and lip seal 8, thereby reduced because of the lip seal 8 slope aversion that engine vibration arouses, and then avoided the tight problem of lip seal 8 seal.
As shown in fig. 1 and 4, a concave plane 31 is provided on the top surface of the lower end of the cylinder head cover 3, and a connecting sleeve mounting hole is opened at the concave plane 31. The concave plane 31 further shortens the distance between the connecting sleeve 92 and the lip-shaped sealing ring 8, further reduces the inclined displacement of the lip-shaped sealing ring 8 caused by the vibration of the engine, and improves the sealing performance.
In the present embodiment, the inclined end surface of the cylinder head cover 3 preferably forms an angle of 5 ° to 15 ° with the horizontal plane.
The engine cylinder head fuel supply structure can be applied to various types of engines, such as an engine with the cylinder head 1 and the cylinder head cover 3 directly connected through bolts.
The cylinder cover fence 4 can also be arranged between the cylinder cover 3 and the cylinder cover 1, the cylinder cover fence 4 is connected with the cylinder cover 3 through bolts, and the cylinder cover 1 is connected with the cylinder cover fence 4 through bolts. The specific structure of the cylinder head enclosure 4 is described in detail in patent CN208456722U, and will not be described in detail herein.
The fuel supply structure of the engine cylinder cover of the utility model can form a low-pressure fuel oil return cavity and a low-pressure fuel oil return channel which are reliable in sealing in the cylinder cover, thereby avoiding the use of a fuel return rod, saving parts and reducing the risk of low-pressure fuel oil leakage; reliable installation and sealing of an oil inlet pipeline can be provided, and leakage of high-pressure fuel oil is prevented; and the oil discharge channel is provided with an internal leakage prevention oil discharge channel, so that high-pressure fuel oil can be prevented from flowing into the cylinder head cover after being leaked and being mixed with lubricating oil.
The present invention is not limited to the above embodiments, and all improvements made based on the concept, principle, structure and method of the present invention are all within the protection scope of the present invention.
Claims (10)
1. An engine head fuel supply structure comprising: the fuel injector is arranged on an engine, a cylinder cover of the engine is provided with a fuel injector mounting hole, the fuel injector is characterized in that,
and a low-pressure fuel oil return cavity is arranged between the oil injector and the inner wall of the oil injector mounting hole, a low-pressure fuel oil outlet of the oil injector is positioned in the low-pressure fuel oil return cavity, and a low-pressure fuel oil return passage communicated with the low-pressure fuel oil return cavity is formed in the cylinder cover.
2. The fuel supply structure of the engine cylinder cover according to claim 1, wherein a fuel injector bushing is further installed in the fuel injector installation hole, the fuel injector bushing is arranged on the outer side of the lower portion of the fuel injector, sealing rings are respectively arranged between the fuel injector installation hole and the fuel injector and between the fuel injector bushing and the fuel injector installation hole, and the low-pressure fuel return oil cavity is defined by the two sealing rings, the fuel injector bushing and the fuel injector installation hole.
3. A fuel supply structure for an engine cylinder head according to claim 1, wherein said fuel injector is connected to an oil inlet pipe through a pipe joint device, and an internal leakage prevention oil discharge passage is provided between said pipe joint device and said oil inlet pipe.
4. A fuel supply structure for an engine head according to claim 3, wherein said pipe joint means comprises: the connecting sleeve is in threaded connection with the oil injector;
the oil inlet pipe be provided with the evagination toper link that the sprayer is connected, annular cushion cover is located the oil inlet pipe is outside and be located the upper portion of evagination toper link, set up the oil inlet pipe mounting hole and the annular cushion mounting hole that are linked together in the link sleeve, the oil inlet pipe with be equipped with the erection gap between the oil inlet pipe mounting hole, set up on the annular cushion and prevent interior the oil extraction hole that leaks, prevent interior the oil extraction hole that leaks with the erection gap is linked together and is formed prevent interior the oil extraction passageway that leaks.
5. A fuel supply structure for an engine cylinder head as claimed in claim 4, wherein a cylinder head cover of the engine is provided with a connecting sleeve mounting hole matched with the connecting sleeve, and a lip-shaped sealing ring is mounted between the connecting sleeve and the connecting sleeve mounting hole.
6. An engine head fuel supply structure as claimed in claim 5, wherein the bottom end surface of the cylinder head cover is provided as an inclined end surface, and the nipple mounting hole is provided on the top surface of the end of the cylinder head cover having a lower inclined height.
7. An engine head fuel supply structure as claimed in claim 6, wherein a concave surface is provided on a top surface of an end of said cylinder head cover having a lower inclined height, and said nipple mounting hole is opened at said concave surface.
8. An engine cylinder head fuel supply structure as claimed in claim 6, wherein said inclined end face has an angle of 5 ° to 15 ° with the horizontal plane.
9. An engine head fuel supply structure as claimed in claim 8, wherein said cylinder head is bolted to said cylinder head cover.
10. An engine head fuel supply arrangement as claimed in claim 8, wherein a cylinder head rail is provided between said head cover and said cylinder head, said cylinder head rail being bolted to said head cover, said cylinder head being bolted to said cylinder head rail.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020441485.9U CN211975181U (en) | 2020-03-31 | 2020-03-31 | Engine cylinder lid fuel supply structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020441485.9U CN211975181U (en) | 2020-03-31 | 2020-03-31 | Engine cylinder lid fuel supply structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211975181U true CN211975181U (en) | 2020-11-20 |
Family
ID=73382113
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020441485.9U Active CN211975181U (en) | 2020-03-31 | 2020-03-31 | Engine cylinder lid fuel supply structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211975181U (en) |
-
2020
- 2020-03-31 CN CN202020441485.9U patent/CN211975181U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4485790A (en) | Holding construction of a fuel injection valve in an internal combustion engine | |
| EP2243950B1 (en) | A connector arrangement for a fluid system | |
| US8522752B2 (en) | Co-axial quill assembly for dual fuel common rail system | |
| CN211975181U (en) | Engine cylinder lid fuel supply structure | |
| CN109441685B (en) | High-pressure common rail system of marine low-speed machine | |
| CN101216007A (en) | Diesel engine fuel injector mounting structure | |
| CN106837641B (en) | With the fuel oil high-pressure oil passage system on V-type diesel | |
| CN107905930A (en) | A kind of heavy monoblock pump peculiar to vessel with anti-outer dripping structure | |
| CN1114715A (en) | Weir control of fuel level in a fuel rail tube for reducing the risk of hydra-lock | |
| CN2893194Y (en) | Diesel engine fuel injection device | |
| CN112648120B (en) | Single-cylinder common rail oil supply pump of vane-type oil delivery pump | |
| CN103352783B (en) | A kind of matched with diesel engine oil return of oil injector device | |
| CN207609495U (en) | A kind of heavy monoblock pump peculiar to vessel with anti-outer dripping structure | |
| JPS6313022B2 (en) | ||
| CN110714837B (en) | Turbojet engine lubricating oil system | |
| JPS6121573Y2 (en) | ||
| CN203383959U (en) | Supporting oil sprayer oil return device of diesel engine | |
| CN205478040U (en) | Diesel engine fuel injection system | |
| CN211448869U (en) | Plunger sleeve of diesel engine | |
| US8505515B2 (en) | Hydraulic connection of injector to a pressure source | |
| CN218177317U (en) | Connecting structure for oil return rubber pipe of supercharger | |
| CN216554180U (en) | Oil inlet pressure relief device of high-pressure oil pump | |
| CN220470725U (en) | Corrosion-resistant fluorine-lined check valve structure | |
| CN212003401U (en) | Double-cylinder fuel injection pump | |
| CN216278232U (en) | High-pressure oil pipe assembly and oil injector body |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |