Engine with precombustion chamber

Abstract

The utility model discloses an engine with a pre-combustion chamber, which comprises a cylinder cover assembled on a cylinder body and a pre-combustion chamber main body assembled on the cylinder cover, and after the pre-combustion chamber main body is assembled on the cylinder cover, the pre-combustion chamber main body penetrates through the cylinder cover and extends into a combustion chamber of the cylinder body; a mounting part is arranged on the outer side of the pre-combustion chamber main body, and a limiting part for limiting the mounting part is arranged on the cylinder cover; after the pre-combustion chamber main body is assembled on the cylinder cover, the limiting part and the mounting part are matched to limit the pre-combustion chamber main body at a preset position of the cylinder cover; on the premise that the compact structure of the engine is guaranteed, the assembling and positioning effectiveness of the precombustion chamber on the cylinder cover is improved, the assembling sealing performance is guaranteed, and the effective heat efficiency of an engine combustion system can reach the preset level more easily.

Description

Technical Field

[0001] This utility model relates to the field of engines, specifically to an engine with a pre-combustion chamber. Background Technology

[0002] For internal combustion engines, higher effective thermal efficiency has become an urgent need and development direction for the industry, and the pre-combustion chamber is one of the important ways to improve the thermal efficiency of internal combustion engines. The pre-combustion chamber can increase the combustion speed, accelerate the airflow turbulence in the combustion chamber, achieve rapid and stable combustion, and improve the thermal efficiency of the internal combustion engine.

[0003] The pre-combustion chamber is generally installed inside the cylinder head, and the spark plug is located inside the pre-combustion chamber. The presence of the pre-combustion chamber increases the use of auxiliary components, making the engine structure less compact. Furthermore, the mounting surface of the pre-combustion chamber is relatively wide, which can lead to inaccurate assembly and positioning. This results in poor sealing of the pre-combustion chamber on the cylinder head, which can easily lead to incomplete fuel combustion and poor combustion quality. Consequently, it is difficult for the effective thermal efficiency of the engine combustion system to reach the preset level.

[0004] Therefore, to solve the above problems, an engine with a pre-combustion chamber is needed, which can improve the effectiveness of the pre-combustion chamber's assembly and positioning on the cylinder head while ensuring the engine structure is compact, guaranteeing assembly sealing, and making it easier for the engine's combustion system to achieve the preset thermal efficiency. Utility Model Content

[0005] In view of this, the purpose of this utility model is to overcome the defects in the prior art and provide an engine with a pre-combustion chamber, which can improve the assembly and positioning effectiveness of the pre-combustion chamber on the cylinder head and ensure assembly sealing while ensuring the engine structure is compact, so that the effective thermal efficiency of the engine combustion system can more easily reach the preset level.

[0006] The present invention relates to an engine with a pre-combustion chamber, comprising a cylinder head mounted on a cylinder block and a pre-combustion chamber body mounted on the cylinder head. After the pre-combustion chamber body is mounted on the cylinder head, the pre-combustion chamber body extends through the cylinder head into the combustion chamber of the cylinder block. A mounting part is provided on the outer side of the pre-combustion chamber body, and a limiting part is provided on the cylinder head for limiting the mounting part.

[0007] After the pre-combustion chamber body is assembled on the cylinder head, the limiting part and the mounting part cooperate to limit the pre-combustion chamber body body to a preset position on the cylinder head.

[0008] Furthermore, the limiting part includes a limiting groove formed by a downward recess from the top surface of the cylinder head, and the mounting part includes an insert conforming to the outer contour of the limiting groove;

[0009] After the pre-combustion chamber body is assembled on the cylinder head, the insert is embedded into the limiting groove to limit the pre-combustion chamber body to a preset position on the cylinder head.

[0010] Furthermore, the bottom of the limiting groove is inclined toward the engine intake side, so that after the pre-combustion chamber body is assembled on the cylinder head, the central axis of the pre-combustion chamber body is at an angle to the vertical plane, and the angle between the bottom of the limiting groove and the horizontal plane does not exceed 3°.

[0011] Furthermore, the top surface of the through hole at the pre-combustion chamber main nozzle location on the cylinder head is parallel to the bottom of the limiting groove, and the pre-combustion chamber main nozzle is sealed to the top surface of the through hole by a sealing gasket.

[0012] Furthermore, it also includes a connector, which is used to connect the insert to the cylinder head after the insert is embedded into the limiting groove.

[0013] Furthermore, the connector passes through the bottom of the groove where the insert connects to the limiting groove, and the connector includes two that are diagonally arranged around the circumference of the pre-combustion chamber body.

[0014] Furthermore, it also includes an engine fuel supply system, which includes an auxiliary fuel pump for pumping fuel to the pre-combustion chamber; the auxiliary fuel pump and the main fuel pump for pumping fuel to the combustion chamber are arranged on the same side in the length direction of the engine; the main fuel pump is located on the intake side of the engine, and the auxiliary fuel pump is located on the exhaust side of the engine.

[0015] Furthermore, the exhaust-side camshaft of the engine is provided with an auxiliary oil pump tappet drive cam at the end near the auxiliary oil pump, and the cylinder head has a cavity for accommodating the auxiliary oil pump tappet drive cam.

[0016] The auxiliary oil pump is mounted on the cylinder head cover that mates with the cylinder head, and the tappet of the auxiliary oil pump extends out of the cylinder head cover towards the location of the auxiliary oil pump tappet drive cam, engaging with the auxiliary oil pump tappet drive cam in a transmission relationship.

[0017] Furthermore, it also includes an engine lubrication system, which includes a lubrication passage for allowing lubricating oil to flow to the auxiliary oil pump tappet drive cam and the auxiliary oil pump tappet drive position, the lubrication passage having an oil outlet near the auxiliary oil pump tappet drive cam and the auxiliary oil pump tappet drive position.

[0018] Furthermore, the oil outlet is located close to the end of the cylinder head cover and the auxiliary oil pump tappet.

[0019] Furthermore, the limiting part has a positioning hole I, and the mounting part has a positioning hole II. When the pre-combustion chamber body is assembled on the cylinder head, the positioning hole I and the positioning hole II are kept axially aligned by the positioning pin, so that the pre-combustion chamber body is positioned in the preset position of the cylinder head.

[0020] The beneficial effects of this utility model are as follows: The engine with a pre-combustion chamber disclosed in this utility model, by adding mutually cooperating limiting parts and mounting parts, enables the main body of the pre-combustion chamber to be actively limited in a preset position on the cylinder head, improving the assembly positioning effectiveness of the pre-combustion chamber on the cylinder head, resulting in higher assembly precision and better assembly reliability. This allows the pre-combustion chamber to resist the impact of high-temperature and high-pressure gas inside the cylinder during operation, ensuring assembly sealing, and thus making it easier for the effective thermal efficiency of the engine combustion system to reach the preset level. Attached Figure Description

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0022] Figure 1 This is a schematic diagram of the structure of this utility model;

[0023] Figure 2 This utility model Figure 1 A top-view structural diagram;

[0024] Figure 3 This utility model Figure 2 Schematic diagram of the structure in the AA direction;

[0025] Figure 4 This is a schematic diagram of the cylinder head structure of this utility model;

[0026] Figure 5 This utility model Figure 4 A top-view structural diagram;

[0027] Figure 6 This utility model Figure 5 Schematic diagram of the structure in the middle BB direction;

[0028] Figure 7 This is a schematic diagram of the combustion chamber body of this utility model assembled on the cylinder head.

[0029] Reference numerals: Cylinder head 001, Cylinder head cover 002, Auxiliary oil pump 003, Auxiliary oil pump tappet drive cam 31, Auxiliary oil pump tappet 32, Main oil pump 004, Main oil pump tappet drive cam 41, Main oil pump tappet 42, Oil outlet 51, Cylinder head cover oil passage 52, Cylinder head oil passage 53, Pre-combustion chamber body 1, Limiting part 2, Mounting part 3, Connecting part 4. Detailed Implementation

[0030] Figure 1The diagram shows the structure of this utility model. The engine with a pre-combustion chamber in this embodiment includes a cylinder head 001 mounted on the cylinder block and a pre-combustion chamber body 1 mounted on the cylinder head 001. After the pre-combustion chamber body 1 is mounted on the cylinder head 001, it extends through the cylinder head 001 into the combustion chamber of the cylinder block. A mounting portion 3 is provided on the outer side of the pre-combustion chamber body 1, and a limiting portion 2 is provided on the cylinder head 001 to limit the mounting portion 3. After the pre-combustion chamber body 1 is mounted on the cylinder head 001, the limiting portion 2 and the mounting portion 3 cooperate to limit the pre-combustion chamber body 1 to a preset position on the cylinder head 001. The engine also includes a lubrication system, a cooling system, an engine fuel supply system, an ignition system, and a combustion system. In addition to the pre-combustion chamber body 1, the pre-combustion chamber includes a pre-combustion chamber engine fuel supply subsystem (included by the engine fuel supply system), a pre-combustion chamber ignition subsystem (included by the engine ignition system), and a pre-combustion system (included by the engine combustion system), which will not be described in detail here. The limiting part 2 and the mounting part 3 are detachably connected. By adding the mutually cooperating limiting part 2 and mounting part 3, the pre-combustion chamber body 1 can be actively limited to a preset position on the cylinder head 001, improving the assembly positioning effectiveness of the pre-combustion chamber on the cylinder head 001, resulting in higher assembly precision and better assembly reliability. This allows the pre-combustion chamber to resist the impact of high-temperature and high-pressure gases inside the cylinder during operation, ensuring assembly sealing, and thus making it easier for the effective thermal efficiency of the engine combustion system to reach the preset level. The cooperation form of the limiting part 2 and the mounting part 3 includes a structure of mutual cooperation between protrusions and grooves, a structure of mutual cooperation between splines and keyways, or a pin connection structure, etc. This structure is preferably designed to limit the pre-combustion chamber body 1 to a preset position on the cylinder head 001, and will not be elaborated further here.

[0031] In this embodiment, the limiting part 2 includes a limiting groove formed by a downward recess from the top surface of the cylinder head 001, and the mounting part 3 includes an insert conforming to the outer contour of the limiting groove. After the pre-combustion chamber body 1 is assembled on the cylinder head 001, the insert is embedded into the limiting groove to limit the pre-combustion chamber body 1 to a preset position on the cylinder head 001. This solution, through the cooperation between the limiting groove formed on the top surface of the cylinder head 001 and the insert provided on the pre-combustion chamber body 1, makes the processing of the cylinder head 001 more convenient, and the insert is easy to form on the pre-combustion chamber body 1. On the other hand, since the pre-combustion chamber body 1 itself needs to be embedded on the cylinder head 001, and the existing structure of the cylinder head 001 already forms a guiding and limiting structure for the pre-combustion chamber body 1, this structure is more conducive to the guiding and limiting structure of the pre-combustion chamber body 1 by the cylinder head 001. The overall structure is more reliable and stable, and the assembly sealing of the pre-combustion chamber body 1 on the cylinder head 001 is higher, thereby ensuring the effective thermal efficiency of the engine combustion system.

[0032] In this embodiment, the bottom of the limiting groove is inclined towards the engine intake side, so that the fuel is premixed and burned in the pre-combustion chamber before entering the cylinder, thereby improving combustion efficiency and reducing emissions. After the pre-combustion chamber body 1 is assembled on the cylinder head 001, the central axis of the pre-combustion chamber body 1 is at an angle to the vertical plane. The cylinder head 001 is set horizontally, and the vertical surface is the surface perpendicular to the horizontal plane. The angle between the bottom of the limiting groove and the horizontal plane does not exceed 3°. The inclined structure of the bottom of the limiting groove is beneficial to improving combustion efficiency and also to guiding and limiting the assembly of the pre-combustion chamber body 1 on the engine cylinder head 001. Compared with the flat limiting groove structure, its sealing surface is relatively large, which is more conducive to ensuring the seal between the pre-combustion chamber body 1 and the engine cylinder head 001. In this solution, the angle between the bottom of the limiting groove and the horizontal plane is 2°.

[0033] In this embodiment, the top surface of the through hole at the nozzle of the pre-combustion chamber body 1 on the cylinder head 001 is parallel to the bottom of the limiting groove. The nozzle of the pre-combustion chamber body 1 is sealed to the top surface of the through hole by a sealing gasket. The sealing gasket is an O-ring gasket fitted onto the nozzle of the pre-combustion chamber body 1. The top surface of the through hole at the nozzle of the pre-combustion chamber body 1 on the cylinder head 001 forms a support platform. The nozzle of the pre-combustion chamber body 1 has a convex ring that presses the O-ring gasket tightly onto the support platform on the top surface of the through hole, ensuring the sealing of the combustion chamber, preventing gas leakage, and thus ensuring the normal operation and stable performance of the engine.

[0034] In this embodiment, a connector 4 is also included. After the insert is embedded into the limiting groove, the connector 4 is used to connect the insert to the cylinder head 001. The use of the connector 4 further improves the reliability of the pre-combustion chamber body 1 on the cylinder head 001. The assembly sealing of the pre-combustion chamber body 1 on the engine cylinder head 001 is guaranteed, making it easier for the effective thermal efficiency of the engine combustion system to reach the preset level. The connector 4 can be a bolt, U-shaped clip or locking pin, etc., preferably to achieve a detachable fastening function, which will not be described in detail here.

[0035] In this embodiment, the connector 4 passes through the bottom of the groove where the insert connects to the limiting groove. The connector 4 includes two that are diagonally arranged around the pre-combustion chamber body 1. The connector 4 is a bolt, which further improves the sealing between the pre-combustion chamber body 1 and the cylinder head 001. The outer contour of the limiting groove is approximately rectangular. The bolt is arranged diagonally with the rectangular insert corresponding to the limiting groove, which fastens the insert to the bottom of the limiting groove.

[0036] In this embodiment, the limiting part 2 has a positioning hole I5 and the mounting part 3 has a positioning hole II6. When the pre-combustion chamber body 1 is assembled on the cylinder head 001, the positioning hole I5 and the positioning hole II6 are kept axially aligned by the positioning pin, so that the pre-combustion chamber body 1 is positioned at the preset position of the cylinder head 001. The use of the positioning pin can further improve the assembly alignment of the pre-combustion chamber body 1 on the cylinder head 001, meet the requirements of precision assembly, and reduce the risk of leakage at the joint position.

[0037] This embodiment also includes an engine fuel supply system, which includes an auxiliary fuel pump 003 for pumping fuel to the pre-combustion chamber. Along the length of the engine, the auxiliary fuel pump 003 and the main fuel pump 004 for pumping fuel to the combustion chamber are arranged on the same side. The main fuel pump 004 is located on the engine intake side, and the auxiliary fuel pump 003 is located on the engine exhaust side. It should be understood that the engine fuel supply system of this embodiment also includes a fuel supply path for the main fuel pump 004 to pump fuel to a preset position, a fuel supply path for the auxiliary fuel pump 003 to pump fuel to a preset position, a combustion chamber injector, and a pre-combustion chamber injector, etc., to achieve the intended purpose of the engine fuel supply system, which will not be elaborated further here. The auxiliary oil pump 003 and the main oil pump 004 are set on the same side of the engine and opposite each other, which makes the layout of the engine lubrication system, cooling system and combustion system easier. The cylinder head 001 has a higher degree of integration, and this layout can also reduce the use of external auxiliary components of the engine, which can reduce the failure rate of the engine. At the same time, reducing the use of external auxiliary components of the engine also makes the overall structure of the engine more compact, and the engine can be optimized for miniaturization under the same conditions.

[0038] In this embodiment, an auxiliary oil pump tappet drive cam 31 is provided at one end of the exhaust-side camshaft of the engine near the auxiliary oil pump 003, and the cylinder head 001 has a cavity for accommodating the auxiliary oil pump tappet drive cam 31; the auxiliary oil pump 003 is provided on the cylinder head cover 002 that cooperates with the cylinder head 001, and the tappet of the auxiliary oil pump 003 extends out of the cylinder head cover 002 toward the location of the auxiliary oil pump tappet drive cam 31 and engages in transmission with the auxiliary oil pump tappet drive cam 31.

[0039] like Figure 3 As shown, the intake-side camshaft of the engine is equipped with a main oil pump tappet drive cam 41 that drives the main oil pump tappet 42, and the exhaust-side camshaft of the engine is equipped with an auxiliary oil pump tappet drive cam 31 that drives the auxiliary oil pump tappet 32. The two drive pairs are close to each other, and two independent cavities are formed on the cylinder head 001 to accommodate the main oil pump tappet drive cam 41 and the auxiliary oil pump tappet drive cam 31. The two sides of the cylinder head 001 where the main oil pump 004 and the auxiliary oil pump 003 are mounted are approximately symmetrical, resulting in better balance. The structure and drive pairs of the auxiliary oil pump tappet drive cam 31 are similar to those of the main oil pump tappet drive cam 41, which makes the overall compactness of the engine better.

[0040] In this embodiment, an engine lubrication system is also included. The engine lubrication system includes a lubrication oil passage for allowing lubricating oil to flow to the transmission position of the auxiliary oil pump tappet drive cam 31 and the auxiliary oil pump tappet 32. The lubrication oil passage has an oil outlet 51 near the transmission position of the auxiliary oil pump tappet drive cam 31 and the auxiliary oil pump tappet 32. The oil outlet 51 is located close to the end of the cylinder head cover 002 and the auxiliary oil pump tappet 32. The lubrication oil passage includes a cylinder head oil passage 53 connected to the main oil passage of the engine lubrication system and a cylinder head cover oil passage 52 connected to the cylinder head oil passage 53. The oil outlet 51 is located at the end of the tappet and is located at the top of the auxiliary oil pump tappet drive cam 31 in the vertical direction, so that after the lubricating oil is sent out through the oil outlet 51, it flows through the auxiliary oil pump tappet 32 ​​and drips onto the auxiliary oil pump tappet drive cam 31, thus satisfying the lubrication of the transmission pair. It should be understood that the engine lubrication system of this solution also includes an oil pump, an oil supply path for pumping oil to a preset position by the oil pump, valves and filters installed on the oil supply path, etc., to achieve the intended purpose of the engine lubrication system, which will not be elaborated here.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. An engine having a pre-chamber, characterised in that: The system includes a cylinder head mounted on the cylinder block and a pre-combustion chamber body mounted on the cylinder head. After the pre-combustion chamber body is mounted on the cylinder head, it extends through the cylinder head into the combustion chamber of the cylinder block. A mounting part is provided on the outer side of the pre-combustion chamber body, and a limiting part is provided on the cylinder head for limiting the mounting part. After the pre-combustion chamber body is assembled on the cylinder head, the limiting part and the mounting part cooperate to limit the pre-combustion chamber body body to a preset position on the cylinder head.

2. The engine with a pre-chamber according to claim 1, characterized by: The limiting part includes a limiting groove formed by a downward recess from the top surface of the cylinder head, and the mounting part includes an insert conforming to the outer contour of the limiting groove; After the pre-combustion chamber body is assembled on the cylinder head, the insert is embedded into the limiting groove to limit the pre-combustion chamber body to a preset position on the cylinder head.

3. The engine with a pre-chamber according to claim 2, characterized by: The bottom of the limiting groove is inclined toward the engine intake side so that after the pre-combustion chamber body is assembled on the cylinder head, the central axis of the pre-combustion chamber body is at an angle to the vertical plane, and the angle between the bottom of the limiting groove and the horizontal plane does not exceed 3°.

4. The engine with a pre-chamber according to claim 3, characterized by: The top surface of the through hole at the location where the pre-combustion chamber main nozzle is installed on the cylinder head is parallel to the bottom of the limiting groove, and the pre-combustion chamber main nozzle is sealed to the top surface of the through hole by a sealing gasket.

5. The engine with a pre-chamber according to claim 2, characterized by: It also includes a connector, which is used to connect the insert to the cylinder head after the insert is embedded into the limiting groove.

6. The engine with a pre-chamber according to claim 1, characterized by: It also includes an engine fuel supply system, which includes an auxiliary fuel pump for pumping fuel to the pre-combustion chamber; the auxiliary fuel pump is arranged on the same side as the main fuel pump for pumping fuel to the combustion chamber in the engine fuel supply system along the length of the engine. The main oil pump is located on the engine intake side, and the auxiliary oil pump is located on the engine exhaust side.

7. The engine with a pre-chamber according to claim 6, characterized by: The exhaust-side camshaft of the engine is provided with an auxiliary oil pump tappet drive cam at one end near the auxiliary oil pump, and the cylinder head has a cavity for accommodating the auxiliary oil pump tappet drive cam. The auxiliary oil pump is mounted on the cylinder head cover that mates with the cylinder head, and the tappet of the auxiliary oil pump extends out of the cylinder head cover towards the location of the auxiliary oil pump tappet drive cam, engaging with the auxiliary oil pump tappet drive cam in a transmission relationship.

8. The engine with a pre-chamber according to claim 7, characterized by: It also includes an engine lubrication system, which includes a lubrication passage for allowing lubricating oil to flow to the auxiliary oil pump tappet drive cam and the auxiliary oil pump tappet drive position, the lubrication passage having an oil outlet near the auxiliary oil pump tappet drive cam and the auxiliary oil pump tappet drive position.

9. The engine with a pre-chamber according to claim 8, characterized by: The oil outlet is located near the end of the cylinder head cover and the auxiliary oil pump tappet.

10. The engine with a pre-chamber according to claim 1, characterized by: The limiting part has a positioning hole I, and the mounting part has a positioning hole II. When the pre-combustion chamber body is assembled on the cylinder head, the positioning hole I and the positioning hole II are kept axially aligned by the positioning pin, so that the pre-combustion chamber body is positioned in the preset position of the cylinder head.

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