CN210509416U

CN210509416U - Engine cylinder head and engine

Info

Publication number: CN210509416U
Application number: CN201921437049.8U
Authority: CN
Inventors: 彭飞; 张德胜; 马京卫; 李米龙; 赵磊
Original assignee: Great Wall Motor Co Ltd
Current assignee: Great Wall Motor Co Ltd
Priority date: 2019-08-30
Filing date: 2019-08-30
Publication date: 2020-05-12
Anticipated expiration: 2029-08-30

Abstract

The utility model provides an engine cylinder head and engine, engine cylinder head have intake duct and exhaust passage, and in the intake duct with be equipped with the air intake valve seat circle between engine cylinder head's the cylinder cap combustion chamber, in the exhaust passage with be equipped with the exhaust valve seat circle between the cylinder cap combustion chamber, the center of air intake valve seat circle bottom face is not less than the center setting of exhaust valve seat circle bottom face, and in engine cylinder head's direction of height, the distance between the center of air intake valve seat circle bottom face and exhaust valve seat circle bottom face center is below 0.5 mm. The engine cylinder head can improve the thermal efficiency of the engine and reduce the pollutant discharge amount of the engine.

Description

Engine cylinder head and engine

Technical Field

The utility model relates to a vehicle parts technical field, in particular to engine cylinder head. The utility model discloses still relate to an engine with this engine cylinder head.

Background

In order to improve the thermal efficiency of an engine and reduce the energy consumption and pollutant emission of a vehicle, vehicle factories adopt technologies such as pressurization, direct injection, high compression ratio, Miller cycle and intercooled EGR, and the like, but at present, a fast combustion technology has great potential in the aspects of improving detonation and reducing emission of an oil consumption machine.

The combustion system of the engine comprises an air inlet channel, an oil injector, a spark plug, an air cylinder cover combustion chamber and a piston combustion chamber, wherein the air cylinder cover combustion chamber is positioned at the front end of the combustion chamber of the engine, and has important influence on the flow of air in the combustion chamber of the engine.

SUMMERY OF THE UTILITY MODEL

In view of this, the present invention is directed to an engine cylinder head to have a better usage effect.

In order to achieve the above purpose, the technical scheme of the utility model is realized like this:

the utility model provides an engine cylinder head, in construct intake duct and exhaust duct on the engine cylinder head, and in the intake duct with be equipped with the intake valve seat circle between engine cylinder head's the cylinder head combustion chamber, in the exhaust duct with be equipped with the exhaust valve seat circle between the cylinder head combustion chamber, the center of intake valve seat circle bottom end face is not less than the center setting of exhaust valve seat circle bottom end face, and in engine cylinder head's direction of height, the center of intake valve seat circle bottom end face with the distance between exhaust valve seat circle bottom end face center is below 0.5 mm.

Furthermore, in the height direction of the engine cylinder cover, the center of the bottom end surface of the intake valve seat ring is flush with the center of the bottom end surface of the exhaust valve seat ring.

Furthermore, a baffle plate extending into the cylinder cover combustion chamber is formed on the inner wall surface of the cylinder cover combustion chamber and on the outer wall surface surrounding the lower side of the intake valve seat ring.

Furthermore, the height H of the shielding plate protruding out of the bottom end face of the intake valve seat ring is between 2.4mm and 2.8 mm.

Furthermore, the number of the intake valve seat rings corresponding to the combustion chamber of the cylinder head is two, two end points of the baffle plate projected on the bottom end surface of the intake valve seat ring are respectively connected with the midpoint of the bottom end surface of the intake valve seat ring to form two connecting lines, the included angle α between the two connecting lines is 160-170 degrees, and the included angle β between the angular bisector of the two connecting lines and the connecting line between the midpoints of the bottom end surfaces of the two intake valve seat rings is 85-95 degrees.

Compared with the prior art, the utility model discloses following advantage has:

engine cylinder head, set up to below 0.5mm through the distance with the bottom face center of intake valve seat circle and the bottom face center of exhaust valve seat circle in engine cylinder head direction of height, can make engine cylinder head's combustion chamber comparatively full, be favorable to the circulation of oil-gas mixture in the cylinder cap combustion chamber, can improve oil-gas mixture's combustion rate, improve the thermal efficiency of engine.

Another object of the present invention is to provide an engine, which comprises an engine cylinder body, and further comprises a connection disposed on the engine cylinder body as above.

Further, when the piston in the engine block is positioned at the top dead center, the distance L1 between the electrode center of the spark plug mounted on the engine cylinder head and the top surface of the piston is 5mm or more, wherein the electrode center is the midpoint of the connecting line between the positive electrode and the negative electrode of the spark plug.

Furthermore, a spherical pit is formed in the center of the top surface of the piston.

Furthermore, the ratio of the diameter D1 of the intersection line of the spherical pit and the top surface of the piston to the diameter D2 of the cylinder hole of the engine cylinder block is 0.65-0.75.

Further, the distance L2 of the perpendicular line between the lowest point of the spherical pit and the top surface of the piston is 2-3 mm.

The utility model discloses an engine has the same beneficial effect with foretell engine cylinder head, no longer gives unnecessary details here.

Drawings

The accompanying drawings, which form a part hereof, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without undue limitation. In the drawings:

fig. 1 is a schematic structural diagram of an engine cylinder head according to a first embodiment of the present invention;

fig. 2 is a schematic view of a fitting structure of a spark plug and a piston according to a second embodiment of the present invention;

fig. 3 is an enlarged view of a portion a in fig. 2.

FIG. 4 is an enlarged view of the point B in FIG. 1

FIG. 5 is a view of the bottom end face of the intake valve seat ring according to the first embodiment of the present invention

Description of reference numerals:

1-engine cylinder head, 11-inlet channel, 111-inlet valve seat ring, 112-inlet valve, 113-baffle plate, 12-exhaust channel, 121-exhaust valve seat ring, 122-exhaust valve, 101-cylinder head combustion chamber, 2-engine cylinder body, 21-piston, 2101-spherical pit, 201-cylinder body combustion chamber, 3-oil injector, 4-spark plug, 41-electrode, 411-negative electrode and 412-positive electrode.

Detailed Description

It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.

The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

Example one

The embodiment relates to an engine cylinder head, wherein an air inlet channel 11 and an air outlet channel 12 are constructed on the engine cylinder head 1, an air inlet valve seat ring 111 is arranged between the air inlet channel 11 and a cylinder head combustion chamber 101 of the engine cylinder head 1, an air outlet valve seat ring 121 is arranged between the air outlet channel 12 and the cylinder head combustion chamber 101, the center of the bottom end surface of the air inlet valve seat ring 111 is not lower than the center of the bottom end surface of the air outlet valve seat ring 121, and in the height direction of the engine cylinder head 1, the distance between the center of the bottom end surface of the air inlet valve seat ring 111 and the center of the bottom end surface of the.

As shown in fig. 1 to 3, the engine includes an engine block 2 and an engine cylinder head 1, a block combustion chamber 201 is configured on the engine block 2, a head combustion chamber 101 is configured on the engine cylinder head 1, after the engine cylinder head 1 is mounted on the engine block 2, the block combustion chamber 201 and the head combustion chamber 101 can be buckled to enclose the engine combustion chamber, it should be noted that one engine generally has a plurality of engine combustion chambers, for example, the three-cylinder engine or the four-cylinder engine means that the engine has three engine combustion chambers or four engine combustion chambers, each combustion chamber has an independent intake passage and an exhaust passage, and has the same principle, and this embodiment will be described by taking one of the engine combustion chambers as an example.

The schematic illustration of the working process of the engine is that an intake valve 112 and an exhaust valve 122 are arranged on the cylinder cover 1 of the engine in a sliding way, wherein the intake valve 112 can be matched with an intake valve seat ring 111 to form connection and disconnection between an intake passage 11 and a cylinder cover combustion chamber 101, and the exhaust valve 122 can be matched with an exhaust valve seat ring 121 to form connection and disconnection between an exhaust passage 12 and the cylinder cover combustion chamber 101; an injector 3 and a spark plug 4 are fixed to the cylinder head 1 of the engine. When the engine works in an initial state, the exhaust valve 122 is closed, the exhaust passage 12 is disconnected with the cylinder head combustion chamber 101, the intake valve 112 is opened, the intake passage 11 is communicated with the cylinder head combustion chamber 101, at the moment, external air can enter the engine combustion chamber from the intake passage 11, meanwhile, the oil injector 3 injects oil into the engine combustion chamber, the oil and the air are mixed to form an oil-gas mixture, and the oil-gas mixture can be ignited by the spark plug 4, so that the piston 21 in the cylinder body combustion chamber 201 is pushed to do work outwards; after the first combustion, the intake valve 112 is closed, the exhaust valve 122 is opened, the exhaust gas generated by the combustion of the oil-gas mixture can be discharged from the exhaust passage 12, the piston 21 is reset, and the next combustion cycle is waited to enter.

According to the working process of the engine, air needs to be mixed with oil after entering the combustion chamber of the engine, obviously, the more fully the air and the oil are mixed, the more fully the oil-gas mixture is combusted, the higher the thermal efficiency of the engine is, and the lower the pollutant discharge amount of the engine is.

One important factor affecting the mixing effect of air and oil is the intensity of tumble flow formed by air entering the combustion chamber of the engine. One schematic description of the tumble forming process is as follows, it should be noted that the cylinder head combustion chamber 101 of the present embodiment is specifically a ridge type combustion chamber, after air enters the engine combustion chamber from the intake duct 11, the air entering the engine combustion chamber from the upper side of the gate disc part of the intake valve 112 forms a forward tumble by the guidance of a ridge surface on the side of the cylinder head combustion chamber 101 close to the exhaust duct 12, a wall surface on the side of the cylinder body combustion chamber 201 close to the exhaust duct 12, and the top surface of the piston 21; the air entering the engine combustion chamber from the lower side of the valve plate part of the intake valve 112 forms reverse tumble by the guide of the ridge surface of the cylinder cover combustion chamber 101 close to one side of the intake duct 11, the ridge surface of the cylinder body combustion chamber 201 close to one side of the intake duct 11 and the top surface of the piston 21, wherein the forward tumble can improve the mixing effect of oil and air in the engine, the combustion speed of the oil-gas mixture in the engine combustion chamber is improved, and the reverse tumble can inhibit the strength of the forward tumble and is not beneficial to the improvement of the heat efficiency of the engine.

In the embodiment, the center of the bottom end surface of the intake valve seat ring 111 is not lower than that of the bottom end surface of the exhaust valve seat ring 121, and in the height direction of the engine cylinder head 1, the distance between the center of the bottom end surface of the intake valve seat ring 111 and the center of the bottom end surface of the exhaust valve seat ring 121 is less than 0.5mm, compared with the prior art, the height of the intake valve seat ring 111 is raised, a cylinder head combustion chamber 101 can be fuller, the size of a flow field in a cylinder can be increased, and the combustion speed of an oil-gas mixture is increased. Meanwhile, the air inlet valve seat ring 111 is arranged according to the structure, the air can be ensured to flow smoothly when entering the cylinder cover combustion chamber 101 from the air inlet channel 1 through the air inlet valve seat ring 111, and the air entering the engine combustion chamber from the upper side of the valve plate part of the air inlet valve 112 can be ensured to be attached to the ridge surface of one side, close to the exhaust channel 12, of the cylinder cover combustion chamber 101 to enter the engine combustion chamber to the maximum extent, so that forward tumble with higher strength can be formed.

Preferably, in the height direction of the engine cylinder head 1, the center of the bottom end surface of the intake valve seat 111 is flush with the center of the bottom end surface of the exhaust valve seat 121, so that the above effects are better.

In addition, the embodiment also provides a structure that a baffle plate 113 is arranged on the inner wall of the cylinder head combustion chamber 101 at the position of the intake valve seat ring 111 to improve the tumble strength of the engine. Specifically, as shown in fig. 1 and 4, a baffle plate 113 extending into the cylinder head combustion chamber 101 is formed on the inner wall surface of the cylinder head combustion chamber 101 and around the outer wall surface of the intake valve retainer 111, and the baffle plate 113 is specifically positioned below the intake valve retainer 111.

As shown in fig. 1, 4 and 5, the height H of the blocking plate 113 protruding from the bottom end surface of the intake valve seat 111 is preferably 2.4 to 2.8mm, for example, the height H may be any of 2.4mm, 2.5mm, 2.6mm, 2.7mm and 2.8mm, or any other value of 2.4 to 2.8mm, and if the height H is too small, the effect on the tumble strength in the combustion chamber of the engine is small, and it is difficult to perform the corresponding function, and if the height H is too large, the flow capacity of the intake duct 11 is reduced, so the tumble strength in the engine is reduced, and the performance of the engine is reduced.

Through the arrangement of the shielding plate 113 with the structure, according to the actual operation condition of the engine, when the lift of the intake valve of the engine is small, due to the existence of the shielding plate 113, the air entering the cylinder head combustion chamber 101 from the lower side of the valve disc part of the intake valve 112 can be reduced as much as possible, more air can be promoted to flow through the upper side of the valve disc part of the intake valve 112 to enter the cylinder head combustion chamber 101, and therefore stronger forward tumble is formed, the heat efficiency of the engine can be improved, and the pollutant emission of the engine can be reduced.

In the present embodiment, the distance between the inner side surface of the baffle plate 113 and the outer edge of the valve disk part of the intake valve 112 is set to be 0.2mm to 0.4mm, and preferably 0.3mm, so as to further reduce the amount of air entering the cylinder head combustion chamber 101 from the lower side of the valve disk part of the intake valve 112 and reduce the intensity of reverse tumble flow without affecting the reciprocating sliding of the intake valve 112.

In this embodiment, there are two intake valve seats 111 corresponding to the cylinder head combustion chamber 101, and there are two blocking plates 113 corresponding to the two intake valve seats 111, and the range of each blocking plate 113 surrounding the intake valve seat 111 is preferably set according to the following dimensions, as shown in fig. 1, 4 and 5, in a first connection W1 and a second connection W2 formed by connecting two end points of the blocking plate 113 projected on the bottom end surface of the intake valve seat 111 with a midpoint of the bottom end surface of the intake valve seat, respectively, an included angle α between the first connection W1 and the second connection W2 is preferably 160 ° to 170 °, and the included angle α may be, for example, 162 °, 164 °, 166 °, 168 °, 170 °, or any other value among 160 ° to 170 °.

In an angle bisector W3 between the first connecting line W1 and the second connecting line W2 and a third connecting line W4 between the midpoints of the bottom end faces of the two intake valve races 111, an included angle β between each angle bisector W3 and the third connecting line W4 is preferably 85-95 degrees, the included angle β may be any one of 85 degrees, 87 degrees, 89 degrees, 91 degrees, 93 degrees and 95 degrees, or any other value between 85 degrees and 95 degrees, and the included angle β is further preferably 90 degrees.

In conclusion, the engine cylinder head 1 of the embodiment has the relatively full cylinder head combustion chamber 101, so that the oil-gas mixture has a relatively good circulation effect, the combustion speed of the oil-gas mixture can be improved, meanwhile, the tumble strength in the engine combustion chamber can be further improved by arranging the shielding plate 113, the oil-gas mixing effect in the engine combustion chamber is improved, and further, the thermal efficiency of the engine can be improved.

Example two

The present embodiment relates to an engine comprising an engine block 2 and further comprising an engine cylinder head 1 according to the first embodiment attached to the engine block 2.

In order to further improve the tumble strength in the combustion chamber of the engine by arranging the intake valve seat 111 of the engine cylinder head 1 as in the first embodiment, in this embodiment, as shown in fig. 2 and 3, when the piston 21 is located at the top dead center, the distance L1 between the center of the electrode 41 of the spark plug 4 on the engine cylinder head 1 and the top surface of the piston 21 is greater than or equal to 5mm, wherein the electrode center is the midpoint of the connecting line between the positive electrode 412 and the negative electrode 411 of the electrode 41 of the spark plug 4, specifically, as shown in fig. 3, the electrode 41 includes the negative electrode 411 and the positive electrode 412, and the positive electrode 412 has an extension extending to the lower side of the negative electrode 411, specifically, the electrode center is the center point of the connecting line between the midpoint of the bottom end surface of the negative electrode 411 and the midpoint of the top surface of.

In this embodiment, as shown in fig. 1 to 3, a spherical recess 2101 is formed in the center of the top surface of the piston 21 so as to satisfy the distance between the center of the electrode of the ignition plug 4 and the top surface of the piston 21, and by providing the spherical recess 2101, the top surface of the piston 21 can be made smooth, thereby reducing the power loss of the oil-gas mixture during the flow and improving the tumble strength in the combustion chamber of the engine. Since the spherical recess 2101 is provided below the spark plug 4, the distance between the center of the electrode and the top surface of the piston 21, specifically, the distance between the center of the electrode and the wall surface of the spherical recess 2101 directly below the center of the electrode, is described.

In order to achieve better effects of the spherical recess 2101, as shown in FIG. 1, the ratio of the diameter D1 of the intersection line formed by the spherical recess 2101 and the top surface of the piston 21 to the diameter D2 of the cylinder bore of the engine block 2 is preferably 0.65 to 0.75, such as 0.65, 0.67, 0.7, 0.72, or 0.75, and the distance L2 from the perpendicular line of the spherical recess 2101 and the top surface of the piston 21 is preferably 2 to 3mm, such as 2mm, 2.2mm, 2.4mm, 2.6mm, 2.8mm, or 3 mm.

In summary, the engine of the embodiment may have a relatively full cylinder head combustion chamber 101, so as to enable the oil-gas mixture to flow well, and the top surface of the piston of the engine may reduce the power loss during the flowing process of the oil-gas mixture, thereby effectively increasing the combustion speed of the oil-gas mixture and increasing the thermal efficiency of the engine.

Claims

1. An engine cylinder head, in the engine cylinder head on be constructed with intake duct (11) and exhaust duct (12), and in intake duct (11) with be equipped with between engine cylinder head's the cylinder head combustion chamber (101) intake valve seat circle (111), in exhaust duct (12) with be equipped with between cylinder head combustion chamber (101) exhaust valve seat circle (121), its characterized in that: the center of the bottom end face of the intake valve seat ring (111) is not lower than the center of the bottom end face of the exhaust valve seat ring (121), and in the height direction of the engine cylinder cover, the distance between the center of the bottom end face of the intake valve seat ring (111) and the center of the bottom end face of the exhaust valve seat ring (121) is less than 0.5 mm.

2. The engine cylinder head according to claim 1, characterized in that: in the height direction of the engine cylinder head, the center of the bottom end face of the intake valve seat ring (111) is flush with the center of the bottom end face of the exhaust valve seat ring (121).

3. The engine cylinder head according to claim 1, characterized in that: and a shielding plate (113) extending towards the inside of the cylinder head combustion chamber (101) is formed on the inner wall surface of the cylinder head combustion chamber (101) and on the outer wall surface surrounding the lower side of the intake valve seat ring (111).

4. The engine cylinder head according to claim 3, characterized in that: the height H of the shielding plate (113) protruding out of the bottom end face of the intake valve seat ring (111) is between 2.4mm and 2.8 mm.

5. The engine cylinder head according to claim 3, characterized in that the number of the intake valve seat inserts (111) corresponding to the cylinder head combustion chamber (101) is two, the two end points of the baffle plate (113) projected on the bottom end surface of the intake valve seat insert (111) are respectively connected with the middle point of the bottom end surface of the intake valve seat insert (111) to form two connecting lines (W1, W2), the included angle α between the two connecting lines (W1, W2) is 160-170 degrees, and the included angle β between the bisector (W3) of the two connecting lines (W1, W2) and the connecting line (W4) between the middle points of the bottom end surfaces of the intake valve seat inserts (111) is 85-95 degrees.

6. An engine comprising an engine block (2), characterized in that: an engine cylinder head according to any one of claims 1 to 5 attached to the engine block (2).

7. The engine of claim 6, wherein: when the piston (21) in the engine cylinder block (2) is positioned at the top dead center, the distance L1 between the electrode center of the spark plug (4) arranged on the engine cylinder cover and the top surface of the piston (21) is more than 5mm, wherein the electrode center is the midpoint of a connecting line between the positive electrode (412) and the negative electrode (411) of the spark plug (4).

8. The engine of claim 7, wherein: a spherical recess (2101) is formed in the center of the top surface of the piston (21).

9. The engine of claim 8, wherein: the ratio of the diameter D1 of the intersection line of the spherical pit (2101) and the top surface of the piston (21) to the diameter D2 of the cylinder hole of the engine block (2) is between 0.65 and 0.75.

10. The engine of claim 8, wherein: the distance L2 of a perpendicular line between the lowest point of the spherical pit (2101) and the top surface of the piston (21) is between 2 and 3 mm.