CN220791377U

CN220791377U - Cylinder assembly of engine and engine

Info

Publication number: CN220791377U
Application number: CN202322519054.6U
Authority: CN
Inventors: 闫珊珊; 李斌; 唐忠刚; 王立冬
Original assignee: Weichai Power Co Ltd
Current assignee: Weichai Power Co Ltd
Priority date: 2023-09-15
Filing date: 2023-09-15
Publication date: 2024-04-16
Anticipated expiration: 2033-09-15

Abstract

The utility model discloses a cylinder assembly of an engine and the engine, wherein the cylinder assembly comprises: a cylinder body including a cylinder head; the oil injector stretches into the cylinder body through the cylinder cover, the oil injector is embedded into the cylinder cover through a cylinder cover liner, a sealing piece is arranged between the oil injector and the cylinder cover liner, and the sealing piece is used for sealing a gap between the oil injector and the cylinder cover liner. After the oil injector is connected with the cylinder cover bushing, a gap exists between the oil injector and the cylinder cover bushing, and in order to prevent oil from influencing the oil nozzle of the oil injector through the gap, a sealing element is arranged at the gap, and the gap between the oil injector and the cylinder cover bushing is sealed by the sealing element to prevent high-temperature and high-pressure pulse fuel gas from entering the gap, so that the temperature at the oil nozzle is effectively prevented from rising, and the normal use of the oil nozzle is ensured.

Description

Cylinder assembly of engine and engine

Technical Field

The utility model relates to the technical field of engines, in particular to a cylinder assembly of an engine and the engine.

Background

For an internal combustion engine adopting "(High Pressure Direct Injection, HPDI) high-pressure direct injection diesel oil to ignite natural gas technology, namely a natural gas HPDI internal combustion engine, a fuel injector of the natural gas HPDI internal combustion engine can inject a small amount of main fuel for direct injection in a substitute fuel cylinder such as ignition diesel oil, natural gas/methanol and the like.

The oil sprayer is arranged on the cylinder cover assembly, and the oil nozzle of the oil sprayer is led into the cylinder, so as to realize the oil spraying function in the compression ignition process. The mounting of the fuel injector accomplishes the positioning and sealing functions through the fuel injector liner on the cylinder head assembly.

Currently, when the fuel injector is assembled with the cylinder, the fuel injector extends into the cylinder through the cylinder head. In order to ensure the tightness in the cylinder, the mounting surface at the bottom of the fuel injector is matched and sealed with the bushing of the cylinder cover, so that the purpose of sealing fuel gas in the cylinder is realized.

When the fuel injector is assembled with the liner of the cylinder cover, the axis of the fuel injector is ensured to coincide with the axis of the cylinder cover while the sealing is ensured. Specifically, the upper part of the oil sprayer is in small clearance fit with the cylinder head lining so as to ensure the positioning of the oil sprayer and the cylinder head lining; the lower part of the fuel injector is in large clearance fit with the cylinder head lining so as to facilitate the fuel injector to be inserted into the cylinder head lining; the middle part of the oil sprayer is in contact with the cylinder head lining through a sealing surface, so that the oil sprayer is sealed with the cylinder head lining.

When the high-temperature high-pressure pulse fuel gas reaches the sealing surface of the fuel injector and the cylinder cover bushing through the small gap, the connection of the sealing surface is invalid, the sealing effect is affected, and then the high-temperature fuel gas enters the large gap, so that the nozzle of the fuel injector is heated, and the normal use of the nozzle of the fuel injector is affected.

Therefore, how to prevent the high-temperature fuel from affecting the cooling of the nozzle of the fuel injector so as to ensure the normal use of the nozzle is a technical problem to be solved by the skilled person.

Disclosure of utility model

In view of the above, the present utility model provides a cylinder assembly of an engine, which prevents high-temperature fuel from affecting cooling of a nozzle of a fuel injector to ensure normal use of the nozzle. In addition, the utility model also provides an engine with the cylinder assembly.

In order to achieve the above purpose, the present utility model provides the following technical solutions:

A cylinder assembly of an engine, comprising:

A cylinder body including a cylinder head;

The oil injector stretches into the cylinder body through the cylinder cover, the oil injector is embedded into the cylinder cover through a cylinder cover liner, a sealing piece is arranged between the oil injector and the cylinder cover liner, and the sealing piece is used for sealing a gap between the oil injector and the cylinder cover liner.

Preferably, in the cylinder assembly of the engine, the first end of the fuel injector is provided with a fuel injection nozzle, a first gap and a second gap are arranged between the fuel injector and the cylinder head lining, and the second gap is positioned between the first gap and the fuel injection nozzle along the axial direction of the fuel injector;

And the seal is located at the second gap.

Preferably, in the cylinder assembly of the engine, the cylinder head liner has a receiving groove for receiving the seal.

Preferably, in the cylinder assembly of the engine, the accommodating groove is an annular groove, and the sealing element is a sealing ring.

Preferably, in the cylinder assembly of the engine, the height of the accommodating groove is the same as the height of the sealing member, and the sum of the depth of the accommodating groove and the gap is greater than the thickness of the sealing member.

Preferably, in the cylinder assembly of the engine, the fuel injector comprises a first section, a gradual change section and a second section which are connected in sequence, the diameter of the first section is larger than that of the second section, and the fuel injector is positioned at the end part of the second section;

the first section has the first gap with the cylinder head liner, and the second section has the second gap with the cylinder head liner.

Preferably, in the cylinder assembly of the engine, the sealing member is a ring sealing ring with an opening, and the sealing member is a metal sealing ring.

Preferably, in the cylinder assembly of the engine, the annular seal ring includes:

A main body section;

a first mating segment connected to a first end of the body segment,

The second cooperation section, the second cooperation section with the second end of main part section is connected, just first cooperation section with the overlap joint of second cooperation section is arranged, and first cooperation section with overlap joint size between the second cooperation section is adjustable.

Preferably, in the cylinder assembly of the engine, the first mating surface of the first mating section and the second mating surface of the second mating section are in overlap joint, and the first mating surface and the second mating surface are both planar;

the outer ring of the main body section is an arc surface, and the inner ring of the main body section is a plane attached to the oil sprayer.

Preferably, in the cylinder assembly of the engine, the lengths of the first mating section and the second mating section are the same, and the central angle of the overlapped first mating section and second mating section relative to the circular ring seal ring is alpha,

And the central angle satisfies: [1- (D1-2*R-2*L)/D3 ] 360 DEG.ltoreq.alpha.ltoreq. [ (L3-L0) - (pi.D0-pi.D3) ]/pi/D3 ] 360 DEG; and D3 < D0;

Wherein D0 is the diameter of the fuel injector where the seal is installed; d1 is the inner diameter of the cylinder head liner at the location of the seal; r is the radius of the outer ring of the main body section; d3 is the inner diameter of the seal in the free state; l0 is the overlapping length of the first matching section and the second matching section after the fuel injector is pressed on the cylinder cover bushing; l3 is the length of the first mating segment or the length of the second mating segment.

An engine comprising a cylinder assembly, wherein the cylinder assembly is any one of the cylinder assemblies described above.

The utility model discloses a cylinder assembly of an engine, wherein after an oil injector is connected with a cylinder cover bushing, a gap exists between the oil injector and the cylinder cover bushing, and in order to prevent oil from influencing an oil nozzle of the oil injector through the gap, a sealing element is arranged at the gap in the embodiment of the utility model, and the gap between the oil injector and the cylinder cover bushing is sealed by the sealing element to prevent high-temperature and high-pressure pulse fuel gas from entering the gap, so that the temperature at the oil nozzle is effectively prevented from rising, and the normal use of the oil nozzle is ensured.

In addition, the embodiment of the utility model also discloses an engine with the cylinder assembly, and the engine also has the technical effects.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a front cross-sectional view of a cylinder assembly of an engine disclosed in an embodiment of the application;

FIG. 2 is an enlarged view of a portion of I in FIG. 1;

FIG. 3 is an enlarged view of part of II in FIG. 2;

FIG. 4 is a schematic view of a seal disclosed in an embodiment of the present application;

FIG. 5 is a front cross-sectional view of a seal disclosed in an embodiment of the application;

FIG. 6 is a top view of a seal disclosed in an embodiment of the present application;

FIG. 7 is a front view of the seal disclosed in an embodiment of the present application after deployment;

Wherein,

1 Is an oil injector, 2 is a cylinder cover, 3 is a cylinder cover lining, 4 is a main fuel nozzle, 5 is a pilot diesel nozzle, 6 is a second gap, 7 is a first gap, and 8 is a sealing element;

31 is a receiving slot, 81 is a main body section, 82 is a first mating section, and 83 is a second mating section.

Detailed Description

The utility model discloses a cylinder assembly of an engine, which prevents high-temperature fuel from affecting the cooling of a nozzle of an oil sprayer so as to ensure the normal use of the nozzle. In addition, the utility model also discloses an engine with the cylinder assembly.

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

The terms "first" and "second" are used below for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature.

As shown in fig. 1, a cylinder assembly of an engine disclosed in an embodiment of the present application includes a cylinder body including a cylinder head 2 and a fuel injector 1 extending into the cylinder body through the cylinder head 2 for igniting fuel gas inside the cylinder.

In order to ensure sealing between the injector 1 and the cylinder body, it is necessary to ensure sealing of the connection of the injector 1 with the cylinder head 2. Based on this, the cylinder head 2 is embedded with the cylinder head liner 3, and the fuel injector 1 is mounted in the cylinder head liner 3, realizing the connection of the fuel injector 1 with the cylinder head 2.

When the injector 1 is assembled with the cylinder head liner 3, the injector 1 needs to be axially positioned to prevent the injector 1 from axially moving. The fuel injector 1 in some embodiments is of a reducing structure, and axial limiting is formed at the axial reducing position, so that axial movement of the fuel injector 1 is prevented.

After the oil sprayer 1 is connected with the cylinder head lining 3, a gap exists between the oil sprayer 1 and the cylinder head lining 3, and in order to prevent oil from influencing an oil nozzle of the oil sprayer 1 through the gap, in the embodiment of the application, the sealing element 8 is arranged at the gap, and the gap between the oil sprayer 1 and the cylinder head lining 3 is sealed by the sealing element 8, so that high-temperature and high-pressure pulse fuel gas is prevented from entering the gap, thereby effectively preventing the temperature at the oil nozzle from rising and ensuring the normal use of the oil nozzle.

As shown in connection with fig. 1, the first end of the injector 1 has an oil jet, which in some embodiments comprises a main fuel nozzle 4 and a pilot diesel nozzle 5. Wherein the main fuel nozzle 4 is located at the side of the first end of the injector 1 and the pilot diesel nozzle 5 is located in the middle of the first end of the injector 1.

It should be noted that the positions of the main fuel nozzle 4 and the pilot diesel nozzle 5 may be set according to different needs, and are both within the protection range.

As shown in fig. 2, there are a first gap 7 and a second gap 6 between the injector 1 and the cylinder head liner 3, and the second gap 6 is located between the first gap 7 and the fuel injector in the axial direction of the injector 1, i.e., the second gap 6 is near the first end of the injector 1. The above-mentioned seal 8 is located at the second gap 6.

The sealing element 8 is close to the oil nozzle, so that the sealing at the oil nozzle can be more facilitated, high-temperature and high-pressure pulse gas is prevented, the sealing between the oil nozzle 1 and the cylinder cover liner 3 is influenced, and a small amount of fuel gas enters the second gap 6, so that the temperature at the oil nozzle is effectively prevented from rising, and the normal use of the oil nozzle is ensured.

In some embodiments, for a positive mounting of the seal 8, the cylinder head liner 3 has a receiving groove 31 for receiving the seal 8, the shape and size of the receiving groove 31 being compatible with the seal 8.

When the cylinder assembly is installed, the sealing element 8 is installed in the accommodating groove 31, and the sealing element 8 can be prevented from moving along the axial direction of the cylinder head lining 3 through the accommodating groove 31, so that the stability of the position of the sealing element 8 is ensured.

In some embodiments, the receiving groove 31 is an annular groove and the corresponding seal 8 is a sealing ring. In order to ensure the assembly of the sealing member 8 in the receiving groove 31, the height of the receiving groove 31 is the same as the height of the sealing member 8, i.e., the sealing member 8 forms a seal with the receiving groove 31 in the height direction. The sum of the depth of the receiving groove 31 and the gap is greater than the thickness of the sealing member 8. It is ensured that the sealing member 8 does not interfere with the bottom of the accommodation groove 31 after the installation of the fuel injector 1.

When the sealing member 8 is located in the second gap 6, the sum of the depth of the accommodating groove 31 and the gap is larger than the gap in the thickness of the sealing member 8, and the gap is the second gap 6.

The height herein is the axial length of the cylinder head liner 3, and the thickness is the radial length of the cylinder head liner 3.

The fuel injector 1 in some embodiments comprises a first section, a gradual section and a second section which are connected in sequence, wherein the diameter of the first section is larger than that of the second section, and the fuel injector is positioned at the end of the second section. The first section and the cylinder head liner 3 have a first gap 7 therebetween, and the second section and the cylinder head liner 3 have a second gap 6 therebetween. While the transition piece is in sealing contact with the cylinder head liner 3.

It should be noted that the first section and the second section may be equal-diameter sections or have a step structure. While the transition section is tapered.

While the specific structure of the fuel injector 1 has been disclosed above, it will be understood by those skilled in the art that the shape of the fuel injector 1 may be set according to various needs, the core of the present application is that the seal 8 is provided between the fuel injector 1 and the cylinder head liner 3 to seal the gap between the fuel injector 1 and the cylinder head liner 3, and thus, the improvement on this basis is within the scope of protection.

Alternatively, the seal 8 is a rubber seal, but the impulse action of the gas can impact the rubber seal, which can easily cause seal failure of the rubber seal, based on which, in some embodiments, a metal seal is employed. In order to ensure the sealing effect of the metal seal ring and the installation requirement of the metal seal ring, the seal member 8 in the embodiment of the application is a circular ring seal ring with an opening.

The material of the sealing element 8 is temperature-resistant alloy steel/stainless steel, and the specific material is determined according to the simulation calculation temperature.

As shown in fig. 4 to 7, the ring seal of the present application includes a main body section 81, a first mating section 82, and a second mating section 83.

Wherein, first mating segment 82 is connected with the first end of main part section 81, and second mating segment 83 is connected with the second end of main part section 81, and first mating segment 82 and second mating segment 83 overlap joint are arranged, overlap joint size between first mating segment 82 and the second mating segment 83 is adjustable.

The overlap of the first mating segment 82 and the second mating segment 83 ensures a seal to the gap; the overlap joint size between the two is adjustable, and the annular sealing ring can be conveniently sleeved on the fuel injector 1.

In some embodiments, the first mating surface of the first mating segment 82 and the second mating surface of the second mating segment 83 are in overlapping arrangement, and the first mating surface and the second mating surface are both planar; the outer ring of the main body section 81 is an arc surface, the inner ring of the main body section 81 is a plane attached to the fuel injector 1, i.e. the longitudinal section of the main body section 81 is D-shaped.

The seal 8 is in a transition fit or small clearance fit with the injector 1 for sealing the fuel gas while thermally conducting with the cylinder head liner 3. The inner ring of the main body section is of a rectangular structure, the width L of the rectangular section is provided with chamfers R1 at two sides, and the sealing element 8 and the accommodating groove 31 are convenient to assemble.

The dimensional relationships of the respective components will be described with reference to fig. 3 to 7.

The lengths of the first matching section 82 and the second matching section 83 are the same, and the central angle of the overlapped first matching section 82 and second matching section 83 relative to the circular ring sealing ring is alpha.

The opening of the seal 8 is L-shaped, with h1=0.1mm=2×h2for wire cut thickness. In the process of pressing the sealing member 8 into the accommodating groove 31 from the free state, the central angle α satisfies: pi D3-pi (D1-2*R-2*L) pi 3 alpha/360, it is necessary to ensure that the opening of the seal 8 is large enough for the seal 8 to compress from the free state to the internal diameter dimension of the cylinder head liner 3, ensuring the opening margin.

After the fuel injector 1 is installed in the sealing element 8, the central angle alpha satisfies the following conditions: (L3-pi D3 alpha/360 degrees) - (pi D0-pi D3) not less than L0, namely an overlapping area after press fitting, wherein L0 is not less than 2mm;

the openings of the sealing member 8 are overlapped with a certain length to form a fuel gas sealing labyrinth, so that burst fuel gas pulse is avoided and high-temperature fuel gas is prevented from entering.

To sum up, the central angle satisfies: [1- (D1-2*R-2*L)/D3 ] 360 DEG.ltoreq.alpha.ltoreq. [ (L3-L0) - (pi.D0-pi.D3) ]/pi/D3 ] 360 DEG; and D3 < D0.

In the above formula: d0 is the diameter of the injector 1 where the seal 8 is installed; d1 is the inner diameter of the cylinder head liner 3 at the location of the seal 8; r is the radius of the outer ring of the body section 81; d3 is the inner diameter of the seal 8 in the free state; l0 is the overlapping length of the first matching section 82 and the second matching section 83 after the fuel injector is pressed on the cylinder head lining 3; l3 is the length of the first mating segment 82 or the length of the second mating segment 83; h is the height dimension of the seal 8; h1 is the height dimension of the first mating segment 82 and H2 is the height dimension of the second mating segment 83.

In some embodiments, D0 and D1 described above also satisfy: (0.2-0.4) mm= (D1-D0)/2, where (D1-D0)/2 is the gap between the injector 1 and the cylinder head liner 3 at the mounting position of the seal 8.

In addition, in a free state of the seal 8, that is, in a state in which the seal 8 is fitted into the accommodation groove 31 of the cylinder head liner 3, and the fuel injector 1 is not assembled: d3 is less than D0; d2 > D4 > D1, wherein,

D2 is the outer diameter of the accommodation groove 31 of the cylinder head liner 3, and D4 is the outer diameter of the seal 8.

In the process of pressing the sealing element 8 into the accommodating groove 31 of the cylinder head lining 3, since the outer diameter of the accommodating groove 31 is larger than the diameter of the cylinder head lining 3, the sealing element 8 is extruded from a free state in the process of entering the accommodating groove 31 from the cylinder head lining 3, and the outer diameter size of the sealing element 8 is compressed from D4 to D1 and enters the cylinder head lining 3; after reaching the accommodating groove 31, the outer diameter of the accommodating groove 31 is larger, and the sealing element 8 is restored to a free state under the restoring force of the sealing element 8.

During assembly of the seal 8, it is necessary to ensure that the opening of the seal 8 is large enough to meet the compression requirements of the seal 8.

After the sealing element 8 is installed in place, the fuel injector 1 is installed, and because the size of the inner diameter of the sealing element 8 in a free state is smaller than the outer diameter of the fuel injector 1, after the fuel injector 1 is installed in place, as shown in fig. 3, the sealing element 8 swells in a free state, and the inner diameter of the sealing element 8 swells until D0 reaches the joint of the fuel injector 1, so that sealing is realized.

During assembly of the injector 1, it is necessary to ensure that the overlap area of the openings of the seal 8 (as shown in fig. 4) is sufficiently large to ensure that the seal 8 seals between the injector 1 and the cylinder liner 3.

The size of the seal 8 can be set by a person skilled in the art according to the above-mentioned relation.

The metal seal 8 in the application can be formed by cold drawing by adopting round wires, and the seal 8 with the required shape and size can be obtained by adopting the wire cutting and cold bending forming processes.

In addition, the application also discloses an engine comprising the cylinder assembly, wherein the cylinder assembly is disclosed in the embodiment, so that the engine with the cylinder assembly has all the technical effects and is not described in detail herein.

As used in the specification and in the claims, the terms "a," "an," "the," and/or "the" are not specific to a singular, but may include a plurality, unless the context clearly dictates otherwise. In general, the terms "comprises" and "comprising" merely indicate that the steps and elements are explicitly identified, and they do not constitute an exclusive list, as other steps or elements may be included in a method or apparatus. The inclusion of an element defined by the phrase "comprising one … …" does not preclude the presence of additional identical elements in a process, method, article, or apparatus that comprises an element.

In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present utility model. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present utility model is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A cylinder assembly of an engine, comprising:

A cylinder body including a cylinder head;

2. The cylinder assembly of the engine of claim 1 wherein the first end of the injector has an oil jet, the injector and the cylinder head liner having a first gap therebetween and a second gap therebetween, the second gap being located between the first gap and the oil jet in the axial direction of the injector;

And the seal is located at the second gap.

3. The cylinder assembly of claim 2, wherein the cylinder head liner has a receiving groove for receiving the seal.

4. A cylinder assembly of an engine according to claim 3, wherein the receiving groove is an annular groove and the seal is a sealing ring.

5. The engine cylinder assembly of claim 4 wherein the height of the pocket is the same as the height of the seal and the sum of the depth of the pocket and the gap is greater than the thickness of the seal.

6. The engine cylinder assembly of claim 2 wherein said fuel injector includes a first segment, a transition segment, and a second segment connected in sequence, and wherein the diameter of said first segment is greater than the diameter of said second segment, and wherein said fuel injector is located at an end of said second segment;

7. A cylinder assembly of an engine according to any one of claims 1 to 6, wherein the seal is a ring seal having an opening and the seal is a metal seal.

8. The engine cylinder assembly of claim 7, wherein the annular seal ring comprises:

A main body section;

a first mating segment connected to a first end of the body segment,

9. The engine cylinder assembly of claim 8, wherein a first mating surface of the first mating segment and a second mating surface of the second mating segment are in overlapping arrangement, and wherein the first mating surface and the second mating surface are both planar;

10. The engine cylinder assembly of claim 8 wherein said first mating segment and said second mating segment are of the same length and wherein said overlapping first mating segment and said second mating segment have a central angle of alpha relative to said annular seal ring,

11. An engine comprising a cylinder assembly, wherein the cylinder assembly is as claimed in any one of claims 1 to 10.