CN218376703U

CN218376703U - Engine and vehicle

Info

Publication number: CN218376703U
Application number: CN202222838800.3U
Authority: CN
Inventors: 李斌; 谷雨; 王立冬; 陈国斌
Original assignee: Weichai Power Co Ltd
Current assignee: Weichai Power Co Ltd
Priority date: 2022-10-27
Filing date: 2022-10-27
Publication date: 2023-01-24
Anticipated expiration: 2032-10-27

Abstract

The utility model belongs to the technical field of the vehicle, an engine and a vehicle are disclosed, the engine comprises an oil sprayer bush and an oil sprayer, the inner wall of the oil sprayer bush is provided with a conical surface, the oil sprayer is arranged on the oil sprayer bush in a penetrating way, the oil sprayer is provided with a conical sealing part, and the outer peripheral surface of the conical sealing part is an arc surface protruding towards the oil sprayer bush; the conical surface is abutted against the arc-shaped surface and keeps a line contact state. In this engine, the direct butt of the arcwall face through the conical surface of sprayer bush and sprayer forms line contact, seals the clearance between sprayer and the sprayer bush, prevents that the gas in the combustion chamber upwards creeps along the clearance between sprayer and the sprayer bush, has further improved sealed effect and reliability to can rectify the position of sprayer, can avoid the gas leakage problem that the assembly improper leads to.

Description

Engine and vehicle

Technical Field

The utility model relates to the field of vehicle technology, especially, relate to engine and vehicle.

Background

The diesel engine includes cylinder, cylinder head, sprayer and sprayer bush etc. on the cylinder was located to the cylinder head lid, the sprayer bush was worn to locate by the sprayer, and the cylinder head is worn to locate by the sprayer bush, and the bottommost of sprayer can be with the flame direct contact of combustion chamber, for the heat of preventing the combustion chamber upwards stretches and influence the performance of sprayer from the gap between sprayer and the sprayer bush, need seal between sprayer and the sprayer bush. In the prior art, the outer wall of the oil sprayer is provided with a first abutting plane, the inner wall of the oil sprayer bushing is provided with a second abutting plane, the copper gasket is located between the first abutting plane and the second abutting plane, the end face of one end of the gasket abuts against the first abutting plane, and the end face of the other end of the gasket abuts against the second abutting plane. However, the oil injector and the oil injector bush are sealed by the copper gasket, the copper gasket is in surface contact with the oil injector and the oil injector bush, the matching area is large, the sealing surface pressure between the oil injector and the copper gasket is small, the sealing effect is poor, and the problem of air leakage is caused due to the fact that the surface pressure is not uniform easily caused by improper process operation in the maintenance process.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an engine and vehicle to solve and adopt the copper gasket to seal sprayer and sprayer bush, cooperation area is great, and the sealed face between sprayer and the copper gasket is pressed lessly, and sealed effect is not good, and the uneven condition of face pressure appears because of technology misoperation easily, leads to the problem of gas leakage.

To achieve the purpose, the utility model adopts the following technical proposal:

an engine, comprising:

the inner wall of the oil sprayer bushing is provided with a conical surface;

the fuel injector penetrates through the fuel injector bushing, the fuel injector is provided with a conical sealing part, and the peripheral surface of the conical sealing part is an arc-shaped surface protruding towards the fuel injector bushing;

the conical surface is abutted against the arc-shaped surface and keeps a line contact state.

As a preferable mode of the engine, the radius R of the arc-shaped surface gradually decreases along a direction in which the upper end of the fuel injector extends toward the lower end of the fuel injector; the lower end of the fuel injector is close to a combustion chamber of the engine relative to the upper end of the fuel injector.

As a preferable mode of the engine, the engine further includes a cylinder head, the injector bushing is inserted into the cylinder head, an outer wall of the injector bushing is provided with a first contact surface, an inner wall of the cylinder head is provided with a second contact surface, the first contact surface is in contact with the second contact surface, and the second contact surface is close to a combustion chamber of the engine relative to the first contact surface.

As a preferred scheme of the engine, the engine further includes a compression bolt and a compression block, the compression bolt penetrates through the compression block and is in threaded connection with the cylinder head, one end of the compression block abuts against a nut of the compression bolt, and the other end of the compression block abuts against the cylinder head and the fuel injector respectively.

As a preferable scheme of the engine, the cylinder head is provided with a cooling water cavity, the injector bush is partially located in the cooling water cavity, the engine further includes a seal ring, the seal ring is disposed between the cylinder head and the injector bush, and the injector bush is partially located between the seal ring and the first abutting surface.

As a preferable scheme of the engine, an outer wall of the injector bush is provided with an external thread, an inner wall of the cylinder head is provided with an internal thread, the external thread is screwed with the internal thread, and the external thread is located between the second abutting surface and a combustion chamber of the engine.

As a preferable mode of the engine, the injector bush is provided with a crimping portion, the crimping portion is in interference fit with the cylinder head, and the crimping portion is located between the second abutting surface and a combustion chamber of the engine.

As a preferable mode of the engine, the injector bush is made of stainless steel or copper alloy material.

As a preferable mode of the engine, an angle α between the tapered surface and a central axis of the injector bush is 35 ° to 45 °, and a radius R of the arc-shaped surface is 70mm to 90mm.

A vehicle comprising the engine described above.

The utility model has the advantages that:

the utility model provides an engine and vehicle, this engine, the outer peripheral face of the toper sealing of sprayer behind the sprayer bush and the conical surface butt of sprayer bush are worn to locate by the sprayer, to the convex arcwall face of sprayer bush and the conical surface butt of sprayer bush promptly, because the arc is to the sprayer bush protrusion, arcwall face and conical surface are line contact. In the engine, the conical surface of the fuel injector bush is directly abutted with the arc-shaped surface of the fuel injector to form line contact, so that a gap between the fuel injector and the fuel injector bush is sealed, the fuel gas in a combustion chamber is prevented from upwards spreading along the gap between the fuel injector and the fuel injector bush, compared with the prior art that the fuel injector and the fuel injector bush are sealed by adopting a copper gasket, the surface contact is changed into line contact, the contact area is reduced, the contact part between the arc-shaped surface of the fuel injector and the conical surface of the fuel injector bush is a contact zone, when downward pretightening force of the fuel injector is transmitted to the contact zone when the fuel injector is installed, because the area of the contact zone is very small, a very large contact pressure intensity can be formed, the sealing effect and the reliability are further improved, and because the conical sealing part of the fuel injector is matched with the conical surface of the fuel injector bush, the position of the fuel injector can be corrected, the central axis of the fuel injector is superposed with the central axis of the fuel injector bush, and the problem of gas leakage caused by improper assembly can be avoided.

Drawings

Fig. 1 is a schematic structural diagram of an engine according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of a fuel injector of an engine according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a part of a fuel injector of an engine according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a fuel injector bushing of an engine according to an embodiment of the present invention.

In the figure:

1. an oil injector; 11. a tapered seal portion; 111. an arc-shaped surface;

2. a fuel injector liner; 21. a crimping part; 22. a conical surface; 23. a first abutting surface;

3. a cylinder head; 31. a cooling water chamber;

4. a hold-down bolt;

5. a compression block;

6. and (5) sealing rings.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present application, unless expressly stated or limited otherwise, the recitation of a first feature "on" or "under" a second feature may include the recitation of the first and second features being in direct contact, and may also include the recitation of the first and second features not being in direct contact, but being in contact with another feature between them. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", and the like are used in the orientation or positional relationship shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to be limiting.

The utility model provides an engine and vehicle, as shown in fig. 1-4, this engine includes sprayer bush 2 and sprayer 1, the inner wall of sprayer bush 2 is equipped with conical surface 22, sprayer 1 wears to locate sprayer bush 2, sprayer 1 is equipped with conical seal portion 11, the outer peripheral face of conical seal portion 11 is to the convex arcwall face 111 of sprayer bush 2; the tapered surface 22 abuts against the arcuate surface 111 and maintains a line contact state. After the injector 1 is inserted into the injector bush 2, the outer peripheral surface of the conical sealing portion 11 of the injector 1 abuts against the conical surface 22 of the injector bush 2, that is, the arc-shaped surface 111 protruding toward the injector bush 2 abuts against the conical surface 22 of the injector bush 2, and since the arc-shaped surface 111 protrudes toward the injector bush 2, the arc-shaped surface 111 and the conical surface 22 are in line contact. In the engine, the conical surface 22 of the fuel injector bush 2 is directly abutted with the arc-shaped surface 111 of the fuel injector 1 to form line contact, so that a gap between the fuel injector 1 and the fuel injector bush 2 is sealed, and the fuel gas in a combustion chamber is prevented from upwards spreading along the gap between the fuel injector 1 and the fuel injector bush 2. The engine is a high pressure direct injection compression ignition natural gas engine, i.e., an HPDI engine.

Alternatively, the radius R of the arc-shaped surface 111 gradually decreases in a direction in which the upper end of the fuel injector 1 extends toward the lower end of the fuel injector 1; the lower end of the injector 1 is close to the combustion chamber of the engine relative to the upper end of the injector 1. It will be appreciated that the edge of the cross-section of the conical sealing portion 11 in the axial direction of the fuel injector 1 is an arc, and the radius R of the arc face 111 is the radius of this arc. Since the radius R of the arc-shaped surface 111 gradually decreases from the upper end to the lower end in the axial direction of the fuel injector 1, the position of the contact strip moves upward when the fuel injector 1 is pressed downward, and a good sealing state of line contact is maintained. After the fuel injector 1 is used for a long time, the conical sealing part 11 is abraded, the abrasion of the conical sealing part 11 slightly moves downwards, so that a contact zone moves upwards, a good linear contact sealing state can be still kept, and the sealing effect is not influenced.

Optionally, the engine further includes a cylinder head 3, the injector bush 2 penetrates the cylinder head 3, an outer wall of the injector bush 2 is provided with a first abutting surface 23, an inner wall of the cylinder head 3 is provided with a second abutting surface, the first abutting surface 23 abuts against the second abutting surface, and the second abutting surface is close to a combustion chamber of the engine relative to the first abutting surface 23. After the fuel injector bush 2 penetrates through the cylinder cover 3, the fuel injector bush 2 is limited by abutting the first abutting surface 23 and the second abutting surface, and a gap between the fuel injector bush 2 and the cylinder cover 3 is sealed preliminarily.

Optionally, the engine further comprises a compression bolt 4 and a compression block 5, the compression bolt 4 penetrates through the compression block 5 and is in threaded connection with the cylinder head 3, one end of the compression block 5 is abutted against a nut of the compression bolt 4, and the other end of the compression block is abutted against the cylinder head 3 and the fuel injector 1 respectively. The pressing block 5 is fixed on the cylinder cover 3 through the pressing bolt 4, and the pressing block 5 presses the fuel injector 1 to generate surface pressure between the arc-shaped surface 111 of the fuel injector 1 and the conical surface 22 of the fuel injector bush 2, so that the effect of sealing fuel gas is achieved.

Optionally, the cylinder head 3 is provided with a cooling water cavity 31, the injector liner 2 is partially located in the cooling water cavity 31, the engine further includes a seal ring 6, the seal ring 6 is disposed between the cylinder head 3 and the injector liner 2, and the portion of the injector liner 2 located in the cooling water cavity 31 is located between the seal ring 6 and the first abutting surface 23. Cooling water flows in the cooling water cavity 31 and is used for cooling the fuel injector bush 2, the upper end of the fuel injector bush 2 is in clearance fit with the cylinder cover 3, a gap between the upper end of the fuel injector bush 2 and the cylinder cover 3 is sealed through the sealing ring 6, the cooling water is prevented from entering a gap between the upper end of the fuel injector bush 2 and the cylinder cover 3, the first abutting surface 23 and the second abutting surface can initially seal a gap between the lower end of the fuel injector bush 2 and the cylinder cover 3, and the cooling water is prevented from entering a gap between the lower end of the fuel injector bush 2 and the cylinder cover 3.

Alternatively, the outer wall of the injector liner 2 is provided with an external thread, the inner wall of the cylinder head 3 is provided with an internal thread, and the external thread and the internal thread are screwed, and the external thread is located between the second abutting surface and the combustion chamber of the engine. The lower end of the injector liner 2 may be fixedly connected to the cylinder head 3 by screwing with internal and external threads. As an alternative, the injector bushing 2 is provided with a crimping portion 21, the crimping portion 21 being an interference fit with the cylinder head 3, the crimping portion 21 being located between the second abutment surface and the combustion chamber of the engine. The lower end of the injector liner 2 may also be fixedly connected to the cylinder head 3 by press-fitting the press-fitting portion 21 of the injector liner 2 to the cylinder head 3. The two modes can be connected with the fuel injector bush 2 and the cylinder cover 3, so that a gap between the lower end of the fuel injector bush 2 and the cylinder cover 3 is further sealed, cooling water is prevented from entering a combustion chamber between the lower end of the fuel injector bush 2 and the cylinder cover 3, the cylinder cover 3 shares part of pressure borne by the fuel injector bush 2, and the fuel injector bush 2 is prevented from being compressed and deformed.

Alternatively, the injector liner 2 is made of a stainless steel or copper alloy material. When the fuel injector bush 2 is connected with the cylinder cover 3 through the internal thread and the external thread, the fuel injector bush 2 is made of stainless steel materials, so that the reliability is good; when the press-fitting part 21 of the injector bush 2 is press-fitted with the cylinder head 3, the injector bush 2 is made of a copper alloy material, so that the cost is low, and the arrangement space can be saved.

Optionally, the angle α between the conical surface 22 and the central axis of the injector liner 2 is 35 ° to 45 °, and the radius R of the arc-shaped surface 111 is 70mm to 90mm. It will be appreciated that the angle between the conical surface 22 and the central axis of the injector liner 2 and the radius of the arcuate surface 111 may be adjusted as is practical.

The utility model also provides a vehicle, this vehicle includes foretell engine.

It is to be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention and are not intended to limit the embodiments of the present invention. Numerous obvious variations, rearrangements and substitutions will now occur to those skilled in the art without departing from the scope of the invention. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. An engine, characterized by comprising:

the fuel injector comprises a fuel injector lining (2), wherein the inner wall of the fuel injector lining (2) is provided with a conical surface (22);

the fuel injector (1) penetrates through the fuel injector bush (2), the fuel injector (1) is provided with a conical sealing part (11), and the peripheral surface of the conical sealing part (11) is an arc-shaped surface (111) protruding towards the fuel injector bush (2);

the tapered surface (22) abuts against the arc-shaped surface (111) and maintains a line contact state.

2. An engine according to claim 1, characterized in that the radius R of the curved surface (111) is gradually reduced in a direction extending from the upper end of the fuel injector (1) to the lower end of the fuel injector (1); the lower end of the fuel injector (1) is close to a combustion chamber of the engine relative to the upper end of the fuel injector (1).

3. An engine according to claim 1, characterized in that it further comprises a cylinder head (3), the injector liner (2) being pierced in the cylinder head (3), the outer wall of the injector liner (2) being provided with a first abutment surface (23), the inner wall of the cylinder head (3) being provided with a second abutment surface, the first abutment surface (23) abutting against the second abutment surface, the second abutment surface being close to the combustion chamber of the engine with respect to the first abutment surface (23).

4. The engine according to claim 3, characterized in that the engine further comprises a compression bolt (4) and a compression block (5), the compression bolt (4) penetrates through the compression block (5) and is in threaded connection with the cylinder head (3), one end of the compression block (5) abuts against a nut of the compression bolt (4), and the other end of the compression block abuts against the cylinder head (3) and the fuel injector (1) respectively.

5. An engine according to claim 3, characterized in that the cylinder head (3) is provided with a cooling water cavity (31), the injector liner (2) being located partly in the cooling water cavity (31), the engine further comprising a sealing ring (6), the sealing ring (6) being arranged between the cylinder head (3) and the injector liner (2), and the part of the injector liner (2) located in the cooling water cavity (31) being located between the sealing ring (6) and the first abutment surface (23).

6. An engine according to claim 3, characterized in that the outer wall of the injector liner (2) is provided with an external thread and the inner wall of the cylinder head (3) is provided with an internal thread, the external thread and the internal thread being in threaded connection, the external thread being located between the second abutment surface and the combustion chamber of the engine.

7. An engine according to claim 3, characterized in that the injector liner (2) is provided with a crimp (21), the crimp (21) being an interference fit with the cylinder head (3), the crimp (21) being located between the second abutment surface and a combustion chamber of the engine.

8. An engine according to any of claims 1-7, characterized in that the injector liner (2) is made of stainless steel or copper alloy material.

9. An engine according to any one of claims 1-7, characterized in that the angle α between the conical surface (22) and the centre axis of the injector liner (2) is 35-45 °, and the radius R of the curved surface (111) is 70-90 mm.

10. A vehicle, characterized by comprising an engine according to any one of claims 1-9.