Pre-combustion chamber structure

Abstract

The utility model belongs to the technical field of internal combustion engines, and particularly relates to a pre-combustion chamber structure which comprises a pre-combustion chamber body, the pre-combustion chamber body comprises a pre-combustion chamber upper body and a pre-combustion chamber lower body, and the pre-combustion chamber upper body is provided with an oil sprayer mounting hole, a spark plug mounting hole and a sensor mounting hole; the central axis of the oil sprayer mounting hole is parallel to the central axis of the pre-combustion chamber upper body; the central axis of the spark plug mounting hole is obliquely arranged relative to the central axis of the pre-combustion chamber upper body; and the central axis of the sensor mounting hole is obliquely arranged relative to the central axis of the pre-combustion chamber upper body. The pre-combustion chamber structure is formed by detachably splicing the split type pre-combustion chamber upper body and the pre-combustion chamber lower body, and the pre-combustion chamber structure allows an oil sprayer assembly, a spark plug assembly and a cylinder pressure sensor assembly to be assembled into a corresponding oil sprayer mounting hole, a spark plug mounting hole and a sensor mounting hole from different directions. Related parts can be independently disassembled and assembled, and maintenance and overhaul are facilitated.

Description

TECHNICAL FIELD

[0001] The utility model relates to internal combustion engine technical field especially relates to a precombustion chamber structure. BACKGROUND

[0002] Because of the high energy consumption, low thermal efficiency and poor emission of the traditional engine, the mixture in the cylinder of the traditional engine is prone to misfire and broken fire when the content is too low, and even more prone to knock when the local flame propagation is slow.

[0003] Therefore, the existing engine usually adds a precombustion chamber structure to improve the thermal efficiency of the engine by using lean burn technology. The precombustion chamber structure can use jet flame ignition to form multiple ignition points in the main combustion chamber, thereby ensuring the combustion of lean mixture.

[0004] However, the conventional precombustion chamber structure is not convenient for disassembling and assembling related parts, which makes the maintenance and repair of the precombustion chamber structure more difficult. INVENTION CONTENTS

[0005] Therefore, the utility model provides a precombustion chamber structure and engine convenient to disassemble.

[0006] The embodiment of the utility model provides a precombustion chamber structure, which comprises a precombustion chamber main body.

[0007] The precombustion chamber main body comprises a precombustion chamber upper body and a precombustion chamber lower body arranged in the axial direction, the precombustion chamber upper body and the precombustion chamber lower body are both hollow structures, the precombustion chamber upper body and the precombustion chamber lower body are detachably connected to form a precombustion chamber inside the precombustion chamber main body, and the precombustion chamber upper body is provided with an oil injector mounting hole, a spark plug mounting hole and a sensor mounting hole to communicate with the precombustion chamber.

[0008] The oil injector mounting hole vertically penetrates from the top of the precombustion chamber upper body to the bottom of the precombustion chamber upper body, and the central axis of the oil injector mounting hole is parallel to the central axis of the precombustion chamber upper body; the spark plug mounting hole penetrates from the side wall of the precombustion chamber upper body to the bottom of the precombustion chamber upper body, and the central axis of the spark plug mounting hole is inclined relative to the central axis of the precombustion chamber upper body; and the sensor mounting hole penetrates from the side wall of the precombustion chamber upper body to the bottom of the precombustion chamber upper body, and the central axis of the sensor mounting hole is inclined relative to the central axis of the precombustion chamber upper body.

[0009] In some embodiments, the angle of the central axis of the spark plug mounting hole relative to the central axis of the precombustion chamber upper body is α, and α is 6°-16°.

[0010] In some embodiments, α is 11°.

[0011] In some embodiments, the middle axis of the sensor mounting hole is inclined to the middle axis of the precombustion chamber upper body by an angle β, wherein β is 5°-15°.

[0012] In some embodiments, β is 7°.

[0013] In some embodiments, the fuel injector mounting hole, the spark plug mounting hole and the sensor mounting hole are arranged on different sides of the middle axis of the precombustion chamber upper body.

[0014] In some embodiments, the precombustion chamber upper body bottom is provided with an externally threaded plug protrusion, and the precombustion chamber lower body top is correspondingly provided with a slotted notch with an internally threaded, so that the precombustion chamber upper body and the precombustion chamber lower body are connected by threads.

[0015] In some embodiments, the middle part of the precombustion chamber lower body is a hollow cone tapering from top to bottom, and the bottom of the precombustion chamber lower body is a hollow column and is provided with a chamfer.

[0016] In some embodiments, a plurality of injection ports are arranged circumferentially at intervals at the chamfer of the bottom of the precombustion chamber lower body.

[0017] In some embodiments, a limiting ring table is arranged between the middle part of the precombustion chamber lower body and the bottom of the precombustion chamber, and a sealing ring is sleeved on the outer circumferential side of the bottom of the precombustion chamber lower body.

[0018] The precombustion chamber structure of the present embodiment is detachably spliced by a split type precombustion chamber upper body and a precombustion chamber lower body, and the precombustion chamber structure allows the fuel injector assembly, the spark plug assembly and the cylinder pressure sensor assembly to be assembled into the corresponding fuel injector mounting hole, spark plug mounting hole and sensor mounting hole from different directions, so that the related parts can be individually disassembled, facilitating maintenance and repair. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the precombustion chamber structure of the present embodiment;

[0020] Figure 2 It is an exploded structural schematic diagram of the precombustion chamber structure of the present embodiment;

[0021] Figure 3 It is a bottom view structural schematic diagram of the precombustion chamber body of the present embodiment;

[0022] Figure 4 It is a cross-sectional structural schematic diagram of the precombustion chamber body of the present embodiment at one angle;

[0023] Figure 5 It is a cross-sectional structural schematic diagram of the precombustion chamber body of the present embodiment at another angle.

[0024] In the figure: pre-chamber body 100; pre-chamber upper body 110; injector mounting hole 111; spark plug mounting hole 112; sensor mounting hole 113; pin hole 114; pre-chamber lower body 120; chamfer 121; nozzle 122; pre-combustion chamber 130; plug-in protrusion 200; external thread 201; plug-in slot 210; internal thread 211; flange plate 230; through hole 231; first tightening limit mark 300; second tightening limit mark 310; limit ring table 400; sealing ring 410; injector assembly 500; spark plug assembly 600; cylinder pressure sensor assembly 700. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical scheme and advantages of the utility model more clear, the following will be further described in detail in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the utility model and not to limit the utility model.

[0026] The structure, proportion, size, etc. shown in the drawings of the specification are only used to cooperate with the content disclosed in the specification for understanding and reading by those skilled in the art, and are not used to limit the limiting conditions that can be implemented by the utility model. Any modification of structure, change of proportion relationship or adjustment of size, without affecting the effects and purposes that can be produced by the utility model, should still fall within the scope of the technical content disclosed by the utility model.

[0027] The orientations or positional relationships referred to in the specification, such as "upper", "lower", "left", "right", "intermediate", "longitudinal", "transverse", "horizontal", "inner", "outer", "radial", "circumferential", etc. are based on the orientations or positional relationships shown in the drawings, and are only used to facilitate the description, and are not indicative or implied that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model. In addition, the terms "first", "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance.

[0028] As shown in Figure 1 and Figure 2 The embodiment provides a pre-chamber structure, which comprises a pre-chamber body 100, an injector assembly 500, a spark plug assembly 600 and a cylinder pressure sensor assembly 700.

[0029] Specifically referring to Figures 4-5The precombustion chamber body 100 comprises a precombustion chamber upper body 110 and a precombustion chamber lower body 120 arranged axially, wherein the precombustion chamber upper body 110 and the precombustion chamber lower body 120 are hollow structures and are detachably spliced to form a precombustion chamber 130 inside the precombustion chamber body 100.

[0030] Specifically referring to Figures 2-3 The precombustion chamber upper body 110 of the embodiment is provided with an oil injector mounting hole 111, a spark plug mounting hole 112 and a sensor mounting hole 113 which are connected to the precombustion chamber 130, and the oil injector assembly 500, the spark plug assembly 600 and the cylinder pressure sensor assembly 700 are mounted in the oil injector mounting hole 111, the spark plug mounting hole 112 and the sensor mounting hole 113 respectively.

[0031] Specifically referring to Figures 4-5 The oil injector mounting hole 111 of the embodiment vertically penetrates from the top of the precombustion chamber upper body 110 to the bottom of the precombustion chamber upper body 110, and the central axis of the oil injector mounting hole 111 is parallel to the central axis X of the precombustion chamber upper body 110, so that the oil injector assembly 500 can be vertically assembled in the oil injector mounting hole 111 from the top of the precombustion chamber upper body 110, and the oil nozzle of the oil injector assembly 500 vertically sprays fuel downward into the precombustion chamber 130.

[0032] The spark plug mounting hole 112 of the embodiment penetrates from the side wall of the precombustion chamber upper body 110 to the bottom of the precombustion chamber upper body 110, and the central axis of the spark plug mounting hole 112 is inclined at an angle of a relative to the central axis X of the precombustion chamber upper body 110, so that the spark plug assembly 600 can be assembled into the spark plug mounting hole 112 from the side of the precombustion chamber upper body 110. The top of the spark plug assembly 600 is away from the oil injector assembly 500, and the bottom of the spark plug assembly 600 is close to the oil nozzle of the oil injector assembly 500, so that the spark plug assembly 600 can ignite the fuel sprayed by the oil nozzle. Preferably, the angle a is 6°-16°, and particularly when the angle a is 11°, the convenience of assembly and the reliability of igniting fuel can be satisfied.

[0033] The sensor mounting hole 113 of the embodiment penetrates from the side wall of the precombustion chamber upper body 110 to the bottom of the precombustion chamber upper body 110, and the central axis of the sensor mounting hole 113 is inclined at an angle of β relative to the central axis X of the precombustion chamber upper body 110, so that the cylinder pressure sensor assembly 700 can be assembled into the sensor mounting hole 113 from the side of the precombustion chamber upper body 110. The cylinder pressure sensor can detect the pressure in the precombustion chamber 130, so as to control the oil injector assembly 500 to spray fuel at the appropriate time. Preferably, the angle β is 5°-15°, and particularly when the angle β is 7°, the convenience of assembly and the accuracy of cylinder pressure detection can be satisfied.

[0034] The precombustion chamber structure of the embodiment is composed of detachable splicing of the split precombustion chamber upper body 110 and the precombustion chamber lower body 120, and the precombustion chamber structure allows the oil injector assembly 500, the spark plug assembly 600 and the cylinder pressure sensor assembly 700 to be assembled into the corresponding oil injector mounting hole 111, the spark plug mounting hole 112 and the sensor mounting hole 113 from different directions, so that the related parts can be disassembled separately, facilitating maintenance and repair.

[0035] Specifically referring to Figure 3 The oil injector mounting hole 111, the spark plug mounting hole 112 and the sensor mounting hole 113 of the embodiment are all arranged on different sides of the central axis X of the precombustion chamber upper body 110, which can ensure that the oil injector assembly 500, the spark plug assembly 600 and the cylinder pressure sensor assembly 700 have sufficient mounting space and do not interfere with each other.

[0036] Specifically referring to Figure 2 The bottom of the precombustion chamber upper body 110 of the embodiment is preferably provided with a plug-in protrusion 200 with external threads 201, and the top of the precombustion chamber lower body 120 is correspondingly provided with a plug-in groove 210 with internal threads 211. By inserting the plug-in protrusion 200 into the plug-in groove 210 and engaging the external threads 201 on the plug-in protrusion 200 with the internal threads 211 in the plug-in groove 210, the precombustion chamber upper body 110 and the precombustion chamber lower body 120 can be connected through threads, facilitating disassembly and assembly.

[0037] The middle part of the precombustion chamber lower body 120 of the embodiment is a hollow cone shape from top to bottom, and the bottom of the precombustion chamber lower body 120 is a hollow column shape and is provided with a chamfer 121 to facilitate insertion of the precombustion chamber body 100 into the combustion chamber of the engine. A limiting ring table 400 is further arranged between the middle part of the precombustion chamber lower body 120 and the bottom of the precombustion chamber lower body 120, and a sealing ring 410 is sleeved on the outer circumferential side of the bottom of the precombustion chamber lower body 120. The limiting ring table 400 can limit the depth of insertion of the precombustion chamber body 100 into the combustion chamber, and the sealing ring 410 can ensure the airtightness of the connection. A plurality of injection ports 122 are arranged in the circumferential direction at the chamfer 121 of the bottom of the precombustion chamber lower body 120, so that the precombustion chamber is in communication with the combustion chamber of the engine, and the flame in the precombustion chamber can spread to the combustion chamber through the injection ports 122, ensuring full combustion of the fuel in the combustion chamber.

[0038] Specifically referring to Figure 1The first tightening limit mark 300 is arranged on the side wall of the precombustion chamber upper body 110, and the second tightening limit mark 310 is arranged on the side wall of the precombustion chamber lower body 120, the relative position of the first tightening limit mark 300 and the second tightening limit mark 310 can be controlled to control the tightening degree of the precombustion chamber upper body 110 and the precombustion chamber lower body 120. The first tightening limit mark 300 and the second tightening limit mark 310 of the embodiment are preferably planed, which is convenient for processing. The precombustion chamber upper body 110 and the precombustion chamber lower body 120 are placed in the assembling equipment, and the assembling equipment can control the tightness of the threaded connection of the precombustion chamber upper body 110 and the precombustion chamber lower body 120 based on the corresponding limit mark, so as to ensure the connection strength of the precombustion chamber upper body 110 and the precombustion chamber lower body 120.

[0039] With reference to Figure 3 The flange plate 230 is arranged on the top of the precombustion chamber upper body 110, the through hole 231 is arranged on the flange plate 230, the bolt is arranged in the through hole 231, the precombustion chamber main body 100 is detachably fixed to the cylinder cover of the engine, and the maintenance is facilitated. The positioning pin and the pin hole 114 are arranged on the flange plate and are matched and positioned, that is, when the precombustion chamber main body 100 is installed on the cylinder cover of the engine, the positioning pin and the pin hole 114 are used for positioning in advance, so as to ensure the accuracy of assembly.

[0040] The technical features of the above embodiments can be combined in any manner, and in order to make the description simple, all possible combinations of the technical features in the above embodiments are not described, however, as long as the combination of the technical features does not exist contradictory, it should be considered that the range is recorded in the description.

[0041] The above embodiments only express several implementation manners of the utility model, the description is more specific and detailed, but it cannot be understood as the limitation of the scope of the utility model patent. It should be pointed out that for ordinary skilled persons in the art, without departing from the concept of the utility model, a number of modifications and improvements can be made, which belong to the protection range of the utility model. Therefore, the protection range of the utility model patent should be subject to the appended claims.

Claims

1. A pre-combustion chamber structure, comprising a pre-combustion chamber body (100), characterized in that: The pre-combustion chamber body (100) includes an upper pre-combustion chamber body (110) and a lower pre-combustion chamber body (120) arranged along the axial direction. Both the upper pre-combustion chamber body (110) and the lower pre-combustion chamber body (120) are hollow structures. The upper pre-combustion chamber body (110) and the lower pre-combustion chamber body (120) are detachably connected to form a pre-combustion chamber (130) inside the pre-combustion chamber body (100). The upper pre-combustion chamber body (110) is provided with an injector mounting hole (111), a spark plug mounting hole (112), and a sensor mounting hole (113) to communicate with the pre-combustion chamber (130). The injector mounting hole (111) extends vertically from the top of the pre-combustion chamber upper body (110) to the bottom of the pre-combustion chamber upper body (110), and the central axis of the injector mounting hole (111) is parallel to the central axis of the pre-combustion chamber upper body (110); the spark plug mounting hole (112) extends from the side wall of the pre-combustion chamber upper body (110) to the bottom of the pre-combustion chamber upper body (110), and the central axis of the spark plug mounting hole (112) is inclined relative to the central axis of the pre-combustion chamber upper body (110); the sensor mounting hole (113) extends from the side wall of the pre-combustion chamber upper body (110) to the bottom of the pre-combustion chamber upper body (110), and the central axis of the sensor mounting hole (113) is inclined relative to the central axis of the pre-combustion chamber upper body (110).

2. The pre-combustion chamber structure according to claim 1, characterized in that: The angle of inclination of the central axis of the spark plug mounting hole (112) relative to the central axis of the pre-combustion chamber upper body (110) is α, where α is 6° to 16°.

3. The pre-combustion chamber structure according to claim 2, characterized in that: α is 11°.

4. The pre-combustion chamber structure according to claim 1, characterized in that: The angle of inclination of the central axis of the sensor mounting hole (113) relative to the central axis of the pre-combustion chamber upper body (110) is β, where β is 5° to 15°.

5. The pre-combustion chamber structure according to claim 4, characterized in that: β is 7°.

6. The pre-combustion chamber structure according to any one of claims 1-4, characterized in that: The injector mounting hole (111), the spark plug mounting hole (112), and the sensor mounting hole (113) are all located on different sides of the central axis of the upper body of the pre-combustion chamber (110).

7. The pre-combustion chamber structure according to any one of claims 1-4, characterized in that: The bottom of the upper body (110) of the pre-combustion chamber is provided with a plug-in protrusion (200) with external threads (201), and the top of the lower body (120) of the pre-combustion chamber is provided with a corresponding slot with internal threads (211), so that the upper body (110) of the pre-combustion chamber and the lower body (120) of the pre-combustion chamber are connected by threads.

8. The pre-combustion chamber structure according to claim 7, characterized in that: The lower part of the pre-combustion chamber (120) is a hollow cone shape that tapers from top to bottom, and the bottom of the lower part of the pre-combustion chamber (120) is a hollow column shape with a chamfer (121).

9. The pre-combustion chamber structure according to claim 8, characterized in that: Multiple nozzles (122) are arranged circumferentially at intervals at the chamfer (121) at the bottom of the pre-combustion chamber lower body (120).

10. The pre-combustion chamber structure according to claim 8 or 9, characterized in that: A limiting ring platform (400) is provided between the middle part of the lower body (120) of the pre-combustion chamber and the bottom of the lower body (120), and a sealing ring (410) is sleeved on the outer periphery of the bottom of the lower body (120).

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