CN216110975U - Pre-combustion chamber, cylinder cover assembly and gasoline engine - Google Patents
Pre-combustion chamber, cylinder cover assembly and gasoline engine Download PDFInfo
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- CN216110975U CN216110975U CN202121903350.0U CN202121903350U CN216110975U CN 216110975 U CN216110975 U CN 216110975U CN 202121903350 U CN202121903350 U CN 202121903350U CN 216110975 U CN216110975 U CN 216110975U
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- prechamber
- precombustion chamber
- combustion chamber
- cylinder head
- head assembly
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Abstract
The utility model discloses a precombustion chamber, a cylinder cover assembly and a gasoline engine, wherein the precombustion chamber comprises: the precombustion chamber body, this internal precombustion chamber along precombustion chamber body axial extension that is provided with of precombustion chamber, be equipped with the cartridge hole that is linked together with the precombustion chamber on the precombustion chamber body, still be equipped with a plurality of orifices on the precombustion chamber body, a plurality of orifices are evenly spaced apart along the circumferential direction of precombustion chamber body, the orifice has the first drill way and the second drill way of coaxial setting, first drill way forms on the wall of precombustion chamber, the second drill way forms on the outer wall of precombustion chamber body, the central point of all first drill ways all is located same orifice plane, the contained angle has between the radial plane of precombustion chamber and the orifice plane. The precombustion chamber disclosed by the utility model is more flexible in arrangement position and wider in applicability.
Description
Technical Field
The utility model relates to the technical field of gasoline engines, in particular to a precombustion chamber, a cylinder cover assembly and a gasoline engine.
Background
In the related art, the automobile industry has conducted some research on the technology of the prechamber, but in the related art, there still exist some problems, for example, the arrangement position of the prechamber must be set on the central axis of the main combustion chamber, there are limitations on the arrangement position of the nozzle hole around the prechamber, the sealing performance between the prechamber and the cylinder head is poor, the fixation of the prechamber fails after long-term operation, and the like.
SUMMERY OF THE UTILITY MODEL
The present invention is directed to solving at least one of the problems of the prior art. To this end, the utility model proposes a prechamber which can be arranged offset from the central axis of the main combustion chamber and which is more flexible in its installation position.
The utility model also proposes a cylinder head assembly comprising the prechamber described above.
The utility model further provides a gasoline engine which comprises the cylinder cover assembly.
A prechamber according to an embodiment of the utility model comprises: the precombustion chamber body, this internal edge that is provided with of precombustion chamber body axial extension's precombustion chamber, be equipped with on the precombustion chamber body with the plug-in hole that the precombustion chamber is linked together, still be equipped with a plurality of orifices on the precombustion chamber body, it is a plurality of the orifice is followed the circumferential direction of precombustion chamber body evenly separates, the orifice has the first drill way and the second drill way of coaxial setting, first drill way forms on the wall of precombustion chamber, the second drill way forms on the outer wall of precombustion chamber body, all the central point of first drill way all is located same orifice plane, the radial plane of precombustion chamber with the contained angle has between the orifice plane.
According to the precombustion chamber disclosed by the embodiment of the utility model, the included angle is formed between the plane of the jet hole and the radial plane, so that the precombustion chamber body can be obliquely arranged on the cylinder cover, the precombustion chamber does not need to be positioned on the central axis of the main combustion chamber, the requirement on the arrangement space position of the precombustion chamber can be reduced, the arrangement of a cylinder cover assembly is more flexible, and the applicability of the cylinder cover assembly is wider.
According to some embodiments of the utility model, an angle between a radial plane of the prechamber and a plane of the nozzle hole is β, and satisfies: beta is more than or equal to 8 degrees and less than or equal to 14 degrees.
According to some embodiments of the utility model, an angle between a radial line of the nozzle hole planes and an axis of the nozzle hole, which all pass through a center point of the same first orifice, is γ, and satisfies: gamma is more than or equal to 12 degrees and less than or equal to 23 degrees.
A cylinder head assembly according to an embodiment of the present invention includes: a cylinder head having a primary combustion chamber and a first mounting bore in communication with the primary combustion chamber; in the prechamber, the prechamber body is arranged in the first mounting hole, part of the prechamber body extends into the main combustion chamber to form an ignition part, the jet holes are arranged on the ignition part, the axis of the prechamber is inclined relative to the axis of the main combustion chamber, and the plane of the jet holes is vertical to the axis of the main combustion chamber; the first spark plug is connected with the plug hole.
According to the cylinder head assembly provided by the embodiment of the utility model, the precombustion chamber is arranged, and the axis of the precombustion chamber is obliquely arranged relative to the axis of the main combustion chamber, so that the precombustion chamber is not required to be arranged on the central axis of the main combustion chamber, the requirement of arrangement space position of the precombustion chamber can be reduced, the arrangement of the cylinder head assembly is more flexible, the applicability of the cylinder head assembly is wider, in addition, the centers of the first orifices of the plurality of orifices are positioned on the same orifice plane, and the orifice plane is vertical to the axis of the main combustion chamber, so that the orifices can better spray flame to the main combustion chamber, the sufficient combustion is realized, the combustion speed is improved, the combustion time is shortened, and the detonation phenomenon is improved.
According to some embodiments of the present invention, the prechamber body has a first fitting section in an axial direction of the prechamber body, the first fitting section is in interference fit with the first mounting hole, the cylinder head assembly further includes a lock catch disposed at an end of the prechamber body away from the main combustion chamber and abutting against the prechamber body, and the lock catch is connected to an inner wall of the first mounting hole.
In some embodiments of the present invention, the prechamber body further has a second mating section in the axial direction of the prechamber body, the second mating section being located at an end of the first mating section that is close to the main combustion chamber, the second mating section being in transition fit with the inner wall of the first mounting hole.
In some embodiments of the present invention, the prechamber body further includes a positioning section, the positioning section is connected to an end of the first matching section, the end is far away from the main combustion chamber, the diameter of the outer peripheral wall of the positioning section is larger than that of the outer peripheral wall of the first matching section, the first mounting hole has a step surface, the positioning section abuts against the step surface, and a gasket is arranged between the step surface and the positioning section.
According to some embodiments of the utility model, the outer circumferential wall of the prechamber body is provided with a positioning protrusion, and the inner circumferential wall of the first mounting hole is provided with a positioning groove matched with the positioning protrusion.
According to some embodiments of the utility model, the cylinder head further has a second mounting hole communicating with the primary combustion chamber, and the cylinder head assembly further includes a second spark plug coupled to the second mounting hole and extending partially into the primary combustion chamber.
The gasoline engine comprises the cylinder cover assembly.
According to the gasoline engine provided by the embodiment of the utility model, the cylinder cover assembly is arranged, so that the precombustion chamber body is obliquely arranged, the precombustion chamber does not need to be arranged on the central axis of the main combustion chamber, the requirement of the arrangement space position of the precombustion chamber can be reduced, the cylinder cover assembly is more flexibly arranged, the applicability of the cylinder cover assembly is wider, in addition, the centers of the first orifices of the plurality of orifices are positioned on the same orifice plane, and the orifice plane is vertical to the axis of the main combustion chamber, so that the orifices can better spray flame to the main combustion chamber, the flame is fully combusted, the combustion speed is improved, the combustion time is shortened, and the detonation phenomenon is improved.
Additional aspects and advantages of the utility model will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the utility model.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a front view of a cylinder head assembly according to an embodiment of the present invention (with the cylinder head shown);
FIG. 2 is a top view of a cylinder head assembly according to an embodiment of the present invention (with the cylinder head shown);
FIG. 3 is a cross-sectional view taken along line A-A of FIG. 2;
FIG. 4 is a cross-sectional view of a preheat chamber assembly of a cylinder head assembly according to an embodiment of the present invention;
fig. 5 is a front view of a preheating chamber body of a cylinder head assembly according to an embodiment of the present invention;
fig. 6 is a left side view of a preheating chamber body of a cylinder head assembly according to an embodiment of the present invention;
FIG. 7-1 is a cross-sectional view taken along line D-D of FIG. 6, with corresponding angles shown;
FIG. 7-2 is a cross-sectional view taken along line D-D of FIG. 6, illustrating the numbering of the orifices;
fig. 8 is a plan view of a preheating chamber body of a cylinder head assembly according to an embodiment of the present invention;
fig. 9 is an exploded view of a partial structure of a cylinder head assembly according to an embodiment of the present invention;
fig. 10 is a plan view of a preheating chamber body of a cylinder head assembly according to another embodiment of the present invention;
FIG. 11 is a cross-sectional view taken along line B-B of FIG. 10;
FIG. 12 is a front view of a latch of a preheat chamber assembly of a cylinder head assembly according to an embodiment of the present invention;
FIG. 13 is a top view of a latch of a preheat chamber assembly of a cylinder head assembly according to an embodiment of the present invention;
FIG. 14 is a front view of a gasket of a preheat chamber assembly of a cylinder head assembly according to an embodiment of the present invention;
fig. 15 is a left side view of a gasket of a preheating chamber assembly of a cylinder head assembly according to an embodiment of the present invention;
FIG. 16 is a top view of a gasket of a preheat chamber assembly of a cylinder head assembly according to an embodiment of the present invention;
FIG. 17 is a schematic illustration of the operational stages of a cylinder head assembly according to an embodiment of the present invention.
Reference numerals:
100. a cylinder head assembly;
1. a prechamber body; 11. an ignition section; 111. spraying a hole; 12. a first mating segment; 13. a second mating segment; 14. a positioning section; 15. positioning the projection; 16. positioning the notch; 17. a precombustion chamber; 18. inserting holes;
2. a first spark plug;
3. locking; 31. avoiding the notch;
4. a gasket; 5. a gasket;
20. an oil injector; 30. a main combustion chamber.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the utility model and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the utility model. Furthermore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
A prechamber and cylinder head assembly 100 according to an embodiment of the utility model is described below with reference to fig. 1-16.
As shown in fig. 1-3, a cylinder head assembly 100, according to an embodiment of the present invention, includes a cylinder head and a pre-chamber.
Specifically, the cylinder head has a main combustion chamber 30 and a first mounting hole in communication with the main combustion chamber 30. As shown in fig. 4, the prechamber includes a prechamber body 1, the prechamber body 1 is disposed in the first mounting hole, the prechamber body 1 has a prechamber 17 extending along an axial direction of the prechamber body 1, an insertion hole 18 communicating with the prechamber 17 is disposed on the prechamber body 1, the cylinder head assembly 100 further includes a first spark plug 2 connected to the insertion hole 18, a plurality of injection holes 111 communicating with the prechamber are disposed on the prechamber body 1, and the plurality of injection holes 111 are uniformly spaced in a circumferential direction of the prechamber body 1.
As shown in fig. 5, a portion of the prechamber body 1 protrudes into the main combustion chamber 30 to form the ignition portion 11, the injection holes 111 are provided on the ignition portion 11, the injection holes 111 communicate the prechamber 17 and the main combustion chamber 30, and the plurality of injection holes 111 are spaced apart in the circumferential direction of the ignition portion 11. Part of mixed gas in the main combustion chamber 30 can be pressed into the precombustion chamber 17 through the jet hole 111 in the compression stroke of the engine, after the ignition of the first spark plug 2, the mixed gas in the precombustion chamber 17 is ignited, the part of mixed gas is firstly combusted and expanded in the precombustion chamber 17, flame is rapidly diffused all around after forming a fire core, the flame jet hole 111 designed at the bottom of the precombustion chamber 17 is rapidly expanded to the main combustion chamber 30, a plurality of ignition points are formed in the main combustion chamber 30, therefore, the rapid combustion process is realized, the combustion speed is improved, the combustion time is shortened, the combustion state of the mixed gas can be well improved, the air-fuel ratio is further improved, and the oil consumption and the emission are improved. In addition, knocking can be significantly improved by shortening the combustion duration, which is very advantageous for a high compression ratio engine.
In the related technology, in the automobile industry at home and abroad, the gasoline engine special for direct injection hybrid with high thermal efficiency and small discharge capacity has received much attention. In the development process of a supercharged direct injection gasoline engine, knocking is one of important factors for inhibiting the improvement of the thermal efficiency. The utility model provides a technical means for improving the knocking of a gasoline engine, namely, a cylinder cover structure is optimized on the basis of a traditional supercharged direct injection gasoline engine combustion chamber, a precombustion chamber 17 is formed at the top of the cylinder cover combustion chamber, and an oil injector 20 is arranged outside the precombustion chamber 17, so that the precombustion chamber 17 with the structure is called as a passive precombustion chamber 17. Tests show that the passive precombustion cavity 17 technology can improve the thermal efficiency of a 2.0L supercharged direct injection gasoline engine by 2%.
It can be seen that the cylinder head assembly 100 of the present application improves ignition energy and combustion efficiency, thereby improving engine thermal efficiency, with a gain of approximately 2% thermal efficiency.
In addition, each injection hole 111 has a first orifice and a second orifice coaxially provided, the first orifice being formed on the wall surface of the prechamber 17, and the second orifice being formed on the outer wall surface of the prechamber body 1. It will be appreciated that each orifice 111 has two open openings, the opening closer to the prechamber 17 being the first opening and the opening further from the prechamber 17 being the second opening.
The central points of all the first orifices are located on the same orifice plane M, an included angle is formed between the orifice plane M and a radial plane N of the precombustion chamber 17 perpendicular to the axis of the precombustion chamber 17, that is, the orifice plane M is not parallel to the radial plane N, meanwhile, because the plurality of orifices 111 are spaced apart in the circumferential direction of the precombustion chamber body 1, the orifice plane M is not perpendicular to the radial plane N, and the included angles between the orifice plane M and the radial plane N are acute angles and obtuse angles.
When the prechamber is mounted to the cylinder head, the axis of the prechamber 17 can be tilted relative to the axis of the main combustion chamber 30, i.e., the angle between the axis of the prechamber 17 and the axis of the main combustion chamber 30 is acute. Accordingly, the axis of the first mounting hole is also disposed obliquely to the axis of the main combustion chamber 30. Thereby, the requirement of the arrangement space position of the prechamber can be reduced, so that the prechamber does not need to be positioned on the central axis of the main combustion chamber 30, and the cylinder head assembly 100 is more flexibly arranged and has wider application.
The plurality of jet holes 111 can enable the jet holes 111 to better jet flames to the main combustion chamber 30, so that the full combustion can be realized, the combustion speed can be improved, the combustion time can be shortened, and the detonation phenomenon can be improved.
The axis of the prechamber 17 and the axis of the main combustion chamber 30 may be in the same plane or in different planes.
In the correlation technique, because need to guarantee on the precombustion chamber flame orifice along main combustion chamber central symmetry in main combustion chamber, the precombustion chamber can only design at engine main combustion chamber positive center, can't use the unable scheme with the precombustion chamber design in main combustion chamber center to the engine, has the limitation. The present invention is applicable to engines in which the prechamber cannot be designed in the center of the main combustion chamber 30 due to layout problems, thereby improving the applicability of the prechamber solution.
According to the prechamber disclosed by the embodiment of the utility model, the plane of the jet holes and the radial plane form an included angle, so that the prechamber body 1 can be obliquely arranged on a cylinder head, the prechamber does not need to be positioned on the central axis of the main combustion chamber 30, the requirement on the arrangement space position of the prechamber can be reduced, the arrangement of the cylinder head assembly 100 is more flexible, and the applicability of the cylinder head assembly is wider.
As shown in fig. 6, in some embodiments of the present invention, the angle between the plane M of the injection hole and the radial plane N of the prechamber 17 is β, and satisfies: beta is more than or equal to 8 degrees and less than or equal to 14 degrees. For example, the angle between the nozzle hole plane M and the radial plane N may be 8 °, 9 °, 10 °, 11 °, 12 °, 13 °, 14 °, or the like. Preferably, the angle between the orifice plane M and the radial plane N is 11 °. Therefore, the requirement on the arrangement space position of the pre-combustion chamber can be reduced, the cylinder head assembly 100 is more flexibly arranged, and the applicability of the cylinder head assembly is wider.
In some embodiments of the present invention, an included angle between a radial line of the nozzle hole planes, which all pass through the center point of the same first orifice, and the axis of the nozzle hole 111 is γ, and satisfies: gamma is more than or equal to 12 degrees and less than or equal to 23 degrees. For example, the included angle between the radial line of the nozzle hole planes, which all pass through the center point of the same first orifice, and the axis of the nozzle hole 111 may be 12 °, 13 °, 14 °, 15 °, 16 °, 17 °, 18 °, 19 °, 20 °, 21 °, 22 °, 23 °, and the like. Preferably, the radial lines of the nozzle hole planes, which all pass through the center point of the same first orifice, may have an angle of 16 ° or 17 ° with the axis of the nozzle hole 111. Therefore, the distance from the flame sprayed from each spray hole 111 to the cylinder wall is approximately the same, the mixed gas in the main combustion chamber 30 is conveniently ignited, the combustion speed is improved, the combustion time is shortened, and the detonation phenomenon is improved.
In one specific example of the present invention, as shown in fig. 1 to 7, for a 2.0L displacement four-valve combustion chamber, the prechamber body 1 is obliquely arranged, the angle between the prechamber body 1 and the horizontal plane is 79 °, the ignition portion 11 has 8 injection holes 111 with a diameter of 1.1mm, and the two adjacent injection holes 111 are asymmetrically arranged, and the angle in the circumferential direction of the ignition portion 11 is α, and α is 45 °. The 8 spray holes 111 face the gaps between the 4 valves and the valve avoiding pits of the head of the 4 pistons respectively. The ignition portion 11 is a spherical surface, and the injection hole 111 is provided on the spherical surface. For the flame orifice 111 of the prechamber 17, it is mainly determined by the following parameters: 1. prechamber 17 volume; 2. flame orifice 111 diameter; 3. the included angle beta between the plane of the spray hole and the radial plane; 4. the angle distribution α between two adjacent nozzle holes 111; 5. flame orifice 111 angle γ.
Fig. 7 shows the jet flame direction and defines the number of the jet holes 111. The injection angle is designed to ensure that the flame avoids the valve and the top of the piston, which is critical to the reliability of the mechanical parts of the combustion chamber, and table 1 shows α, β and γ of 8 injection holes 111 in the present patent.
TABLE 1
Wherein the volume of the precombustion chamber 17 accounts for 5 percent of the total volume of the combustion chamber.
A cylinder head assembly 100 according to an embodiment of the utility model is described below with reference to fig. 1-16.
The cylinder head assembly 100 according to an embodiment of the utility model comprises a cylinder head and the above-described pre-chamber and first spark plug 2.
Specifically, the cylinder head has a main combustion chamber 30 and a first mounting hole in communication with the main combustion chamber 30. The precombustion chamber body 1 is arranged in the first mounting hole, part of the precombustion chamber body 1 extends into the main combustion chamber 30 to form an ignition part 11, the jet hole 111 is arranged on the ignition part 11, the jet hole 111 is communicated with the precombustion chamber 17 and the main combustion chamber 30, the axis of the precombustion chamber 17 is obliquely arranged relative to the axis of the main combustion chamber 30, the jet hole plane M is vertical to the axis of the main combustion chamber 30, and the first spark plug 2 is connected with the insertion hole 18.
It will be appreciated that the angle between the plane of the orifices M and the axis of the prechamber 17 is the same as the angle between the prechamber body 1 and a horizontal plane perpendicular to the central axis of the main combustion chamber 30.
The centers of the first orifices of the plurality of nozzle holes 111 are located on the same nozzle hole plane, and the nozzle hole plane is perpendicular to the axis of the main combustion chamber 30, so that flame can be better sprayed to the main combustion chamber 30 by the nozzle holes 111, the flame is fully combusted, the combustion speed is increased, the combustion time is shortened, and the detonation phenomenon is improved.
Correspondingly, the axis of the prechamber 17 is inclined at an angle of 71-87 ° relative to the cylinder head.
According to the cylinder head assembly 100 of the embodiment of the utility model, by arranging the prechamber and enabling the axis of the prechamber 17 to be obliquely arranged relative to the axis of the main combustion chamber 30, the prechamber does not need to be arranged on the central axis of the main combustion chamber 30, the requirement of arrangement space position of the prechamber can be reduced, the cylinder head assembly 100 can be arranged more flexibly, the applicability of the cylinder head assembly is wider, in addition, the centers of the first orifices of the plurality of spray orifices 111 are positioned on the same spray orifice plane, and the spray orifice plane is vertical to the axis of the main combustion chamber 30, so that the spray orifices 111 can spray flame to the main combustion chamber 30 better, the combustion is sufficient, the combustion speed is improved, the combustion time is shortened, and the detonation phenomenon is improved.
In some embodiments of the present invention, as shown in fig. 4 and 5, the prechamber body 1 has a first fitting section 12 in the axial direction of the prechamber body 1, and the first fitting section 12 is in interference fit with the first fitting hole, so that by fitting the prechamber body 1 with the first fitting section 12, the connection between the prechamber body 1 and the cylinder head can be achieved, and at the same time, the sealing between the prechamber body 1 and the first fitting hole can be achieved, avoiding air leakage. The cylinder head assembly 100 further includes a latch 3, the latch 3 is disposed at an end of the prechamber body 1 far from the main combustion chamber 30 and abuts against the prechamber body 1, and the latch 3 is connected to an inner wall of the first mounting hole. Can play fixed effect to prechamber body 1 through setting up 3 structures of hasp, can realize the dual fixed to prechamber body 1 through first cooperation section 12 and first mounting hole interference fit and hasp 3 end support prechamber body 1 to improve the fixed reliability of prechamber body 1, avoid being ejecting by the high-pressure gas in main combustion chamber 30 with the combustion chamber body.
In the correlation technique, prechamber body and cylinder cap threaded connection, be equipped with the external screw thread on the periphery wall of prechamber body promptly, be equipped with the internal thread on the internal perisporium of first mounting hole, the prechamber body is under high temperature high pressure operating condition, in engine long-term operation, has the possibility of inefficacy, leads to the prechamber screw thread to become flexible inefficacy, finally leads to engine performance decay, leads to the engine to damage when serious. The utility model adopts double fixed connection, which can avoid the loosening of the precombustion chamber body 1, thereby ensuring the performance of the engine.
Optionally, the latch 3 is in threaded connection with the inner wall of the first mounting hole, so that the connection mode between the latch 3 and the cylinder cover can be simplified, and the connection reliability between the latch 3 and the cylinder cover can be improved. Alternatively, the thread gauge of the shackle 3 may be M24. The first spark plug 2 is screwed to the prechamber body 1. This can simplify the connection between the first spark plug 2 and the prechamber body 1, and can improve the reliability of connection between the first spark plug 2 and the prechamber body 1. Alternatively, the thread gauge in the prechamber body 1 may be M16.
In some embodiments of the utility model, as shown in fig. 12 and 13, the upper end of the shackle 3 has a plurality of spaced relief notches 31, and the plurality of relief notches 31 may cooperate with an installation tool to facilitate installation of the shackle 3.
In some embodiments of the utility model, as shown in fig. 9-11, a gasket 5 is provided between the latch 3 and the prechamber body 1. The specific structure of the gasket 5 is shown in fig. 14-16, whereby the reliability of the connection of the gasket 5 to the prechamber body 1 can be improved.
In some embodiments of the present invention, as shown in fig. 4 and 5, the prechamber body 1 further has a second fitting section 13 in the axial direction thereof, the second fitting section 13 is located at one end of the first fitting section 12 close to the main combustion chamber 30, and the second fitting section 13 is in transition fit with the inner wall of the first mounting hole. From this the assembly between second cooperation section 13 and the cylinder cap of being convenient for, in addition, when the engine normally worked, expansion with heat and contraction with cold of prechamber body 1, second cooperation section 13 and first mounting hole interference fit to increase the reliability of being connected between prechamber body 1 and the cylinder cap, realize the leakproofness between prechamber body 1 and the first mounting hole simultaneously, further guarantee can not leak gas.
As shown in fig. 4 and 5, the prechamber body 1 further includes a positioning section 14, the positioning section 14 is connected to an end of the first matching section 12 away from the main combustion chamber 30, a diameter of an outer peripheral wall of the positioning section 14 is larger than a diameter of the outer peripheral wall of the first matching section 12, and the positioning section 14 and the first matching section 12 form a step portion. The first mounting hole is provided with a step surface, the positioning section 14 is abutted against the step surface, and a gasket 4 is arranged between the step surface and the positioning section 14. Therefore, the reliability of sealing between the precombustion chamber body 1 and the first mounting hole can be improved, and meanwhile, the first matching section 12 and the first mounting hole are in interference fit to realize sealing between the precombustion chamber body 1 and the first mounting hole, so that double sealing is realized, and air leakage of the first mounting hole is avoided.
In some embodiments of the present invention, as shown in fig. 9, the outer circumferential wall of the prechamber body 1 is provided with a positioning protrusion 15, and the inner circumferential wall of the first mounting hole is provided with a positioning groove engaged with the positioning protrusion 15. Thereby, positioning of the prechamber body 1 can be achieved by cooperation of the positioning projection 15 and the positioning groove, thereby defining the mounting angle of the prechamber body 1 and the mounting depth in the first mounting hole.
Of course, as shown in fig. 5 and 8, a positioning notch 16 may be further disposed at an end of the prechamber body 1 away from the nozzle hole 111, a positioning boss corresponding to the positioning notch 16 may be further disposed in the first mounting hole, and positioning of the prechamber body 1 may be achieved by cooperation between the positioning notch 16 and the positioning boss, so as to limit a mounting angle of the prechamber body 1 and a mounting depth in the first mounting hole.
In the process of the assembly of the cylinder cover assembly 100, the prechamber body 1 is firstly pressed and mounted on the cylinder cover through the positioning groove and the positioning protrusion 15, then the lock catch 3 is mounted in the first mounting hole to stop against the prechamber body 1, the lock catch 3 is in threaded connection with the first mounting hole, finally the first spark plug 2 is mounted in the prechamber body 1, and the first spark plug 2 is in threaded connection with the prechamber body 1.
In some embodiments of the present invention, the head further has a second mounting hole in communication with the main combustion chamber 30, and the head assembly further includes a second spark plug coupled to the second mounting hole and extending partially into the main combustion chamber 30. The second spark plug may directly ignite the mixed gas within the primary combustion chamber 30. In order to avoid the complex control requirement and test requirement brought by the cooperative work of the double sparks, the quality problems of knocking, pre-ignition and the like caused by poor control cooperation are reduced. The utility model adopts a simpler and reliable control strategy, is easier to implement and improves the cold start performance of the ultralow temperature in winter. The strategy is as follows: as shown in fig. 17, for the start-up operating condition, region B, the second spark plug operates alone or in conjunction with the first spark plug 2 and the second spark plug, which is used for very low engine speeds, the second spark plug is used for ignition in the main combustion chamber 30 at less than 1000rpm and at cold start ambient temperatures (-below 25 ℃). Aiming at ignition control of the double spark plugs after starting, namely in the area A, after starting is finished, the spark chambers of the pre-combustion chambers are used for ignition, and stable operation of the engine is ensured.
The gasoline engine comprises the cylinder head assembly 100.
According to the gasoline engine of the embodiment of the utility model, the cylinder cover assembly 100 is arranged, so that the precombustion chamber body 1 is obliquely arranged, the precombustion chamber does not need to be arranged on the central axis of the main combustion chamber 30, the requirement of the arrangement space position of the precombustion chamber can be reduced, the cylinder cover assembly 100 is more flexibly arranged, and the applicability of the cylinder cover assembly is wider, in addition, the centers of the first orifices of the plurality of spray orifices 111 are positioned on the same spray orifice plane, and the spray orifice plane is vertical to the axis of the main combustion chamber 30, so that the spray orifices 111 can better spray flame to the main combustion chamber 30, the full combustion can be realized, the combustion speed can be improved, the combustion time can be shortened, and the detonation phenomenon can be improved.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the utility model have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the utility model, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. A precombustor, comprising: precombustion chamber body (1), be provided with in precombustion chamber body (1) and follow precombustion chamber (17) of precombustion chamber body (1) axial extension, be equipped with on precombustion chamber body (1) with plug-in mounting hole (18) that precombustion chamber (17) are linked together, still be equipped with a plurality of orifice (111) on precombustion chamber body (1), it is a plurality of orifice (111) are followed the circumferential direction of precombustion chamber body (1) evenly separates, orifice (111) have the first drill way and the second drill way of coaxial setting, first drill way forms on the wall of precombustion chamber (17), the second drill way forms on the outer wall of precombustion chamber body (1), all the central point in first drill way all is located same orifice plane, the radial plane of precombustion chamber (17) with the contained angle has between the orifice plane.
2. A prechamber according to claim 1, characterised in that the angle between the radial plane of the prechamber (17) and the plane of the nozzle hole is β and satisfies: beta is more than or equal to 8 degrees and less than or equal to 14 degrees.
3. A prechamber according to claim 1, characterised in that the angle between the radial line of the nozzle hole planes, which both pass through the centre point of the same first orifice, and the axis of the nozzle hole (111) is γ, and satisfies: gamma is more than or equal to 12 degrees and less than or equal to 23 degrees.
4. A cylinder head assembly, comprising:
a cylinder head having a primary combustion chamber (30) and a first mounting bore in communication with the primary combustion chamber (30);
a prechamber according to any of claims 1-3, the prechamber body (1) being provided in the first mounting hole, the prechamber body (1) extending partly into the main combustion chamber (30) to form an ignition part (11), the injection holes (111) being provided in the ignition part (11), the axis of the prechamber (17) being arranged obliquely to the axis of the main combustion chamber (30) and the plane of the injection holes being perpendicular to the axis of the main combustion chamber (30);
a first spark plug (2), wherein the first spark plug (2) is connected with the insertion hole (18).
5. The cylinder head assembly according to claim 4, wherein the prechamber body (1) has a first fitting section (12) in the axial direction thereof, the first fitting section (12) is in interference fit with the first mounting hole, the cylinder head assembly (100) further comprises a lock catch (3), the lock catch (3) is arranged at an end of the prechamber body (1) remote from the main combustion chamber (30) and abuts against the prechamber body (1), and the lock catch (3) is connected with an inner wall of the first mounting hole.
6. The cylinder head assembly according to claim 5, characterized in that the prechamber body (1) further has a second fitting section (13) in its axial direction, the second fitting section (13) being located at the end of the first fitting section (12) close to the main combustion chamber (30), the second fitting section (13) being in transition fit with the inner wall of the first mounting hole.
7. The cylinder head assembly according to claim 5, characterized in that the prechamber body (1) further comprises a positioning section (14), the positioning section (14) is connected to an end of the first fitting section (12) remote from the main combustion chamber (30), the diameter of the outer circumferential wall of the positioning section (14) is larger than the diameter of the outer circumferential wall of the first fitting section (12), the first mounting hole has a step surface, the positioning section (14) abuts against the step surface, and a gasket (4) is arranged between the step surface and the positioning section (14).
8. The cylinder head assembly according to claim 4, characterized in that a positioning protrusion (15) is provided on an outer circumferential wall of the prechamber body (1), and a positioning groove that fits the positioning protrusion (15) is provided on an inner circumferential wall of the first mounting hole.
9. The cylinder head assembly as recited in claim 4, wherein said cylinder head further has a second mounting hole communicating with said primary combustion chamber (30), said cylinder head assembly further comprising a second spark plug (20) connected to said second mounting hole and extending partially into said primary combustion chamber (30).
10. A gasoline engine comprising a cylinder head assembly according to any one of claims 4 to 9.
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| CN202121903350.0U CN216110975U (en) | 2021-08-13 | 2021-08-13 | Pre-combustion chamber, cylinder cover assembly and gasoline engine |
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| CN202121903350.0U CN216110975U (en) | 2021-08-13 | 2021-08-13 | Pre-combustion chamber, cylinder cover assembly and gasoline engine |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115111046A (en) * | 2022-01-27 | 2022-09-27 | 长城汽车股份有限公司 | Pre-combustion chamber of engine and engine |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115111046A (en) * | 2022-01-27 | 2022-09-27 | 长城汽车股份有限公司 | Pre-combustion chamber of engine and engine |
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