Spark plug sheath structure for fuel injector of high-horsepower diesel engine

Abstract

The utility model relates to the field of diesel engines, in particular to a spark plug sheath structure for a fuel injector of a high-horsepower diesel engine, which comprises a top and a bottom, a mounting hole is arranged on the upper portion and is a stepped hole, a fuel injector mounting hole is arranged on the lower portion, and the fuel injector mounting hole is communicated with the stepped hole. The top of the spark plug sheath mechanism is divided into an upper portion and a lower portion through a stepped hole, a plurality of wrench installation clamping holes are formed in the step position of the stepped hole and evenly distributed around the annular step of the stepped hole, the size of the wrench installation clamping holes is matched with the size of the working end of a torque wrench, and a sheath bottom installation groove is formed in the air cylinder cover. The spark plug sheath mechanism is mounted in the mounting groove at the bottom of the sheath, so that the problems of cracking of the cylinder cover due to incapability of bearing high temperature, particularly high failure rate and weak reliability of a nose bridge area of the cylinder cover with high temperature and large temperature difference, and cracking of the nose bridge area of the cylinder cover of a diesel engine at the present stage are solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of diesel engine, concretely relates to a sheath structure for high -power diesel engine fuel injector spark plug. BACKGROUND

[0002] Diesel engine can release more heat per liter of diesel due to the larger molecules of diesel and high energy density. This makes diesel engines have an advantage in fuel efficiency and can withstand higher compression ratios and stresses. They operate in a narrower speed range, reducing wear and tear, so they have a longer life and require less maintenance. They are better than natural gas engines.

[0003] But with the diesel engine power more and more big, combustion temperature more and more high, lead to cylinder cover cannot bear high temperature and appear cracking, especially temperature high and big temperature difference cylinder cover nose bridge area, failure rate is high, reliability is weak, diesel engine cylinder cover nose bridge area cracking becomes the diesel engine development industry technical problem.

[0004] At present, a sheath structure for high -power diesel engine fuel injector spark plug is proposed to solve the above-mentioned problems. INVENTION CONTENTS

[0005] The utility model discloses a sheath structure for high -power diesel engine fuel injector spark plug to solve the problem that the cylinder cover cannot bear high temperature and cracking, especially the high temperature and large temperature difference cylinder cover nose bridge area, high failure rate, weak reliability and the cylinder cover nose bridge area cracking of diesel engine.

[0006] To solve the above technical problems, the utility model adopts the technical scheme as follows:

[0007] A sheath structure for high -power diesel engine fuel injector spark plug, the spark plug sheath includes top and bottom, the upper part is provided with mounting hole, the mounting hole is the stepped hole, the lower part is provided with fuel injector mounting hole, the fuel injector mounting hole and the stepped hole are communicated, the stepped hole divides the top of spark plug sheath into upper part and lower part, a plurality of spanner mounting clamping holes are arranged at the step of the stepped hole, the spanner mounting clamping holes are evenly distributed around the annular step of the stepped hole, the size of the spanner mounting clamping hole is matched with the working end size of the torque spanner, the cylinder cover is provided with sheath bottom installation groove, and the spark plug sheath is installed in the sheath bottom installation groove.

[0008] Further limit, the outer thread is arranged on the outer wall of the bottom upper end of the spark plug sheath, the inner thread is arranged on the inner wall upper end of the sheath bottom installation groove, the outer thread and the inner thread size are matched, and the spark plug sheath and the sheath bottom installation groove are small interference fit.

[0009] Further, the wrench installation clamping hole has six holes, which are evenly distributed around the annular step of the stepped hole

[0010] Further, the diameter D4 of the oil injector installation hole is 8mm, the diameter D2 of the lower end of the bottom of the spark plug sheath is 11.7mm, the height L3 is 7.3mm, the size D3 of the external thread is M13X1.5, and the height L2 is 8mm.

[0011] Further, the diameter D1 of the wrench installation clamping hole is 4mm, and the height L1 is 4mm.

[0012] Further, the size D6 of the internal thread is M13X1.5, the height L4 is 8mm, the width D5 of the sheath bottom installation groove is 12mm, and the height L5 is 7mm.

[0013] The beneficial effects of the present application are as follows:

[0014] By accurately controlling the copper sleeve pressing depth, the working position and the oil injection angle of the oil injector can be ensured to be accurate, so that the fuel injection effect is improved. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a top view of the present application;

[0016] Figure 2 is a B-B sectional view of Figure 1

[0017] Figure 3 is a sectional view of the cylinder head;

[0018] Figure 4 is a sectional view of the present application installed in the cylinder head.

[0019] The corresponding marks in the figure are as follows: 1-top, 2-bottom, 3-penetration hole, 4-oil injector installation hole, 5-wrench installation clamping hole, 6-sheath bottom installation groove, 7-O ring, 8-cylinder head, 9-external thread. DETAILED DESCRIPTION

[0020] In order for those skilled in the art to better understand the technical scheme of the present application, the technical scheme of the present application will be further described below in combination with the drawings and examples. EMBODIMENT

[0021] For example, Figures 1-4 ​As shown, a kind of for big horsepower diesel engine fuel injector spark plug sheath structure, spark plug sheath includes top 1 and bottom 2, top is provided with through interface hole 3, through interface hole 3 is ladder hole, the bottom 2 of spark plug sheath is provided with fuel injector mounting hole 4, oil injector mounting hole 4 and through interface hole 3 are communicated, through interface hole 3 will the top of spark plug sheath be divided into upper part and lower part, the step of through interface hole 4 is provided with six spanner installation clamping hole 5, six spanner installation clamping hole 5 is evenly distributed around the annular step of through interface hole 3, the size of spanner installation clamping hole 5 and the size of the working end of torque wrench are matched, the working end of torque wrench is clamped in spanner installation clamping hole 5 and is tightened torque, the bottom of sheath mounting groove 6 is provided in cylinder cover 8, the outer wall on the upper end of the bottom 2 of spark plug sheath is provided with external thread of size D3 as M13X1.5, height L2 is 8mm, the width D5 of sheath bottom mounting groove 6 is 12mm, height L5 is 7mm, and the internal upper end is provided with internal thread of size D6 as M13X1.5, the diameter D4 of fuel injector mounting hole 4 is 8mm, the diameter D2 of the bottom lower end of the spark plug sheath is 11.7mm, height L3 is 7.3mm, the spark plug sheath is installed in sheath bottom mounting groove 6 by the thread cooperation of external thread 9 and internal thread, the spark plug sheath and sheath bottom mounting groove 6 are slightly interference fit, the top of spark plug sheath is provided with O-ring 7, and the unthreaded portion of the bottom of spark plug sheath is extended to the bottom surface of cylinder cover 8 by O-ring 7 sealing water, to ensure that the distance between spark plug sheath and the bottom surface of cylinder cover 8 is 0.3mm in the assembled state, without protruding, i.e. L3-L5=0.3mm, the purpose is to ensure that the dead volume is not affected as much as possible, and the combustion consistency is ensured.

[0022] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying 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 present application.

[0023] The above describes in detail a kind of for big horsepower diesel engine fuel injector spark plug sheath structure provided by the present application, the description of specific embodiment is only for helping to understand the method and its core idea of the present application, it should be pointed out, for the ordinary skilled person in the art, without departing from the premise of the present application, some improvements and modifications can be made to the present application, these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. A heavy duty diesel engine fuel injector spark plug boot structure, characterized by: The spark plug sheath includes a top (1) and a bottom (2), the top (1) is provided with a through hole (3), the through hole (3) is a stepped hole, the bottom (2) is provided with an oil injector mounting hole (4), the oil injector mounting hole (4) is communicated with the through hole (3), the through hole (3) divides the top of the spark plug sheath into an upper part (1) and a lower part (2), a plurality of wrench mounting clamping holes (5) are arranged at the step of the through hole (3), the wrench mounting clamping holes (5) are uniformly distributed around the annular step of the through hole (3), the size of the wrench mounting clamping holes (5) is matched with the size of the working end of a torque wrench, a sheath bottom mounting groove (6) is arranged in a cylinder head (8), and the spark plug sheath is mounted in the sheath bottom mounting groove (6).

2. A spark plug boot for a high horsepower diesel engine fuel injector as defined in Claim 1 wherein: An external thread (9) is arranged on the outer wall of the upper end of the bottom (2) of the spark plug sheath, an internal thread is arranged on the inner wall of the upper end of the sheath bottom mounting groove, the size of the external thread (9) is matched with the size of the internal thread, and the spark plug sheath is in small interference fit with the sheath bottom mounting groove (6).

3. A spark plug boot for a high horsepower diesel engine fuel injector as defined in Claim 1 wherein: The six wrench mounting clamping holes (5) are uniformly distributed around the annular step of the through hole.

4. A spark plug boot for a high horsepower diesel engine fuel injector as defined in claim 2 wherein: The diameter D4 of the oil injector mounting hole (4) is 8 mm, the diameter D2 of the lower end of the bottom (2) of the spark plug sheath is 11.7 mm, the height L3 is 7.3 mm, the size D3 of the external thread (9) is M13X1.5, and the height L2 is 8 mm.

5. A spark plug boot for a high horsepower diesel engine fuel injector as defined in claim 1 wherein: The diameter D1 of the wrench mounting clamping hole (5) is 4 mm, and the height L1 is 4 mm.

6. A fuel injector spark plug shroud structure for a high horsepower diesel engine as defined in claim 2 wherein: The size D6 of the internal thread is M13X1.5, the height L4 is 8 mm, the width D5 of the sheath bottom mounting groove (6) is 12 mm, and the height L5 is 7 mm.

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