阅读说明：本技术 一种发动机气缸垫密封结构 (Sealing structure of engine cylinder gasket ) 是由 苏振兴 张士斌 李想 范建权 眭超 于 2019-11-19 设计创作，主要内容包括：本发明公开了一种发动机气缸垫密封结构,包括气缸体和设置在气缸体上的气缸盖,所述气缸体内设有气缸套,其特征在于：还包括气缸套,所述气缸套设置在气缸体与气缸盖之间,所述气缸体的内壁设有支撑凸台,所述气缸套的外壁设有支撑肩,所述支撑肩与支撑凸台紧靠,所述支撑肩上表面设有凸台和压紧凸起,所述凸台和压紧凸起之间设有凹槽,所述压紧凸起与气缸套过盈配合,所述气缸体的外周上表面与压紧凸起上表面边缘平齐。本发明的优点在于,其气缸垫的结构加工简单,成本更低。其形成了一整圈线密封结构,不仅密封可靠性更强,还可以有效降低因压紧产生的密封应力。其解决了装配后的密封力着力点问题,防止气缸套变形量过大。(The invention discloses an engine cylinder gasket sealing structure, which comprises a cylinder body and a cylinder cover arranged on the cylinder body, wherein a cylinder sleeve is arranged in the cylinder body, and the engine cylinder gasket sealing structure is characterized in that: still include the cylinder jacket, the cylinder jacket sets up between cylinder block and cylinder head, the inner wall of cylinder block is equipped with the support boss, the outer wall of cylinder jacket is equipped with the support shoulder, the support shoulder is close to with the support boss, it is equipped with the boss and compresses tightly the arch to support the shoulder upper surface, the boss with compress tightly and be equipped with the recess between the arch, compress tightly protruding and cylinder jacket interference fit, the periphery upper surface of cylinder block with compress tightly protruding upper surface edge parallel and level. The cylinder gasket has the advantages of simple structural processing and lower cost. The sealing structure forms a whole-circle wire sealing structure, so that the sealing reliability is higher, and the sealing stress generated by pressing can be effectively reduced. The sealing force acting point problem after assembly is solved, and the deformation of the cylinder sleeve is prevented from being overlarge.)

1. The utility model provides an engine cylinder gasket seal structure, includes cylinder block (4) and cylinder head (1) of setting on cylinder block (4), be equipped with cylinder jacket (3) in cylinder block (4), its characterized in that: further comprises a cylinder liner (2), the cylinder liner (2) is arranged between the cylinder block (4) and the cylinder cover (1),

the inner wall of the cylinder body (4) is provided with a supporting boss (41), the outer wall of the cylinder sleeve (3) is provided with a supporting shoulder (31), the supporting shoulder (31) is abutted against the supporting boss (41),

the upper surface of the support shoulder (31) is provided with a boss (33) and a compression bulge (32), a groove (34) is arranged between the boss (33) and the compression bulge (32), the compression bulge (32) is in interference fit with the cylinder sleeve (2),

the upper surface of the periphery of the cylinder body (4) is flush with the edge of the upper surface of the pressing bulge (32).

2. The engine head gasket sealing structure according to claim 1, wherein: the cylinder gasket (2) is of a circular ring structure with the upper surface and the lower surface parallel.

3. The engine head gasket sealing structure according to claim 2, wherein: the boss (33), the groove (34) and the pressing protrusion (32) are all of annular structures arranged on a supporting shoulder (31) at the top of the cylinder sleeve (3).

4. The engine head gasket sealing structure according to claim 3, wherein: the outer diameter of the boss (33) is smaller than the inner diameter of the groove (34).

5. The engine head gasket sealing structure according to claim 4, wherein: the outer diameter of the groove (34) is smaller than the inner diameter of the pressing protrusion (32).

6. The engine head gasket sealing structure according to claim 5, wherein: the outer diameter of the boss (33) is smaller than the inner diameter of the cylinder gasket (2).

7. The engine cylinder head gasket sealing structure according to any one of claims 1 to 6, wherein: and a gap is reserved between the top of the boss (33) and the bottom of the cylinder cover (1).

8. The engine head gasket sealing structure according to claim 7, wherein: the inner diameter of the pressing protrusion (32) is larger than that of the support boss (41).

9. The engine head gasket sealing structure according to claim 8, wherein: the periphery of the cylinder sleeve (2) is flush with the peripheral edges of the cylinder cover (1) and the cylinder body (4).

10. The engine head gasket sealing structure according to claim 9, wherein: and the top of the inner periphery of the cylinder body (4) is provided with a chamfer.

Technical Field

The invention relates to the technical field of engine structure design, in particular to a cylinder gasket sealing structure of an engine.

Background

Along with the upgrading of the emission regulations of automobiles, the strengthening level of an engine is continuously improved, the detonation pressure is higher and higher, and a cylinder port air sealing system between a cylinder body and a cylinder cover of the engine comprises the cylinder body, a cylinder sleeve, a cylinder gasket and the cylinder cover. At present, in an automobile production process, air sealing ribs are generally arranged at corresponding positions of upper cylinder openings of air cylinder liners, the bottom surfaces of air cylinder covers and the top surfaces of the air cylinder liners are kept flat, and when bolts of the air cylinder covers are screwed down, the air sealing ribs deform to generate pressure to seal fuel gas; or a flat cylinder gasket is used, a boss is designed between cylinder sleeves, a groove is designed at the corresponding part of the bottom surface of the cylinder cover, and after the bolt is tightly pressed, the cylinder gasket is extruded into the groove of the cylinder cover to generate pressure and seal gas. In the design of sealing high-temperature and high-pressure fuel gas of a combustion chamber, the traditional asbestos composite type cylinder gasket is less used, and at present, the cylinder gasket is mainly made of metal and mainly made of low-carbon steel.

The metal cylinder gasket is provided with an air sealing rib at the cylinder opening part, the air sealing rib is a whole circle around the cylinder opening, and the cross section of the sealing rib can have various forms: such as single convex rib, double convex rib, arc rib, semi-arc rib, folding, etc. The metal cylinder gasket can be of a single-layer metal structure or a multi-layer metal structure, and the multi-layer metal is generally designed in a flanging or cladding structure at the air sealing part.

The utility model discloses a small cylinder center distance engine cylinder sealing structure with publication number CN208073632U, publication date of 2018, 11 and 9, which discloses a cylinder opening sealing structure of a single-layer metal cylinder gasket, wherein two sealing ribs which are upwards and downwards convex are arranged at the cylinder opening part, and the sealing ribs are full circles; the structure that its adoption cylinder gasket pressure ripples that provides realized combustion chamber gas seal is because cylinder gasket intensity itself is limited, and high temperature resistant, high-pressure gas impact's ability is not enough for the combustion chamber is sealed more and more difficult.

Notice No. CN 205225474U, the utility model patent of 2016 year 5 month 11 days of bulletin date "an internal-combustion engine cylinder head gas seal structure", discloses the seal structure of a individual layer metal cylinder gasket, and its cylinder gasket is the flat structure, and the cylinder jacket top sets up the boss, sets up the recess with boss complex cylinder head bottom surface, and boss and recess are the full circle. Although the leakage risk of the combustion chamber gas sealing can be effectively solved by simply depending on the pressure wave of the cylinder opening of the cylinder gasket, the ring groove structure on the cylinder cover bottom plate is difficult to process, and the cylinder cover bottom plate which is easy to generate fatigue load and crack is very high in risk for bearing high-temperature and high-pressure gas impact, and the part of the cylinder gasket which is extruded to generate plastic deformation also has the risk of cracking.

Disclosure of Invention

The invention aims to solve the problems and provides a cylinder gasket sealing structure of an engine, which is simple in structural processing and can effectively solve the problem of insufficient cylinder opening sealing pressure under the impact of high-temperature and high-pressure gas.

In order to achieve the purpose, the invention designs a cylinder gasket sealing structure of an engine, which comprises a cylinder body and a cylinder cover arranged on the cylinder body, wherein a cylinder sleeve is arranged in the cylinder body, and the cylinder gasket sealing structure is characterized in that: still include the cylinder jacket, the cylinder jacket sets up between cylinder block and cylinder head, the inner wall of cylinder block is equipped with the support boss, the outer wall of cylinder jacket is equipped with the support shoulder, the support shoulder is close to with the support boss, it is equipped with the boss and compresses tightly the arch to support the shoulder upper surface, the boss with compress tightly and be equipped with the recess between the arch, compress tightly protruding and cylinder jacket interference fit, the periphery upper surface of cylinder block with compress tightly protruding upper surface edge parallel and level.

Further, the cylinder gasket is of a circular ring structure with the upper surface and the lower surface parallel. Therefore, the cylinder gasket has simple working procedures and lower cost when being processed.

Furthermore, the boss, the groove and the pressing protrusion are all annular structures arranged on a supporting shoulder at the top of the cylinder sleeve. Therefore, a whole-circle wire sealing structure can be formed among the cylinder sleeve, the cylinder cover and the cylinder gasket, the sealing pressure of the wire sealing structure is higher, and the sealing reliability is higher.

Further, the outer diameter of the boss is smaller than the inner diameter of the groove. Therefore, a whole-circle wire sealing structure can be formed among the boss, the groove, the cylinder gasket and the cylinder cover, the wire sealing structure has higher sealing pressure and higher sealing reliability.

Further, the outer diameter of the groove is smaller than the inner diameter of the pressing protrusion. Outside the line sealing structure, the interference fit among the pressing protrusion, the cylinder gasket and the cylinder cover enhances the sealing pressure of the sealing structure and has higher sealing reliability.

Further, the outer diameter of the boss is smaller than the inner diameter of the head gasket. Therefore, a whole-circle wire sealing structure can be formed among the boss, the groove, the cylinder gasket and the cylinder cover, the wire sealing structure has higher sealing pressure and higher sealing reliability.

Preferably, a gap is reserved between the boss top and the bottom of the cylinder cover. In this way, it is ensured that the required sealing pressure is generated between the projection, the cylinder head gasket and the cylinder head.

Preferably, the inner diameter of the pressing projection is larger than the inner diameter of the support boss. After assembly, the sealing force generated among the pressing protrusion, the cylinder gasket and the cylinder cover falls on the supporting boss of the cylinder body, so that the excessive deformation of the cylinder sleeve is prevented.

Preferably, the cylinder liner outer periphery is flush with the cylinder head, the cylinder block outer peripheral edge. Therefore, when in use, the cylinder sleeve is flush with the cylinder cover and the periphery of the cylinder body, and the best stress structure of the cylinder is better met.

Preferably, the top of the inner periphery of the cylinder block is provided with a chamfer. Thus, the cylinder sleeve is more convenient to be installed in the cylinder body.

The cylinder gasket has the advantages of simple structural processing and lower cost. The sealing structure forms a whole-circle wire sealing structure, so that the sealing reliability is higher, and the sealing stress generated by pressing can be effectively reduced. The sealing force acting point problem after assembly is solved, and the deformation of the cylinder sleeve is prevented from being overlarge.

Drawings

FIG. 1 is a schematic view of the internal structure of the present invention;

fig. 2 is an enlarged schematic view of a point a in fig. 1.

In the figure: the cylinder head 1, the cylinder gasket 2, the cylinder sleeve 3, the cylinder block 4, a support boss 41, a support shoulder 31, a pressing protrusion 32, a boss 33 and a groove 34.

Detailed Description

The invention is described in further detail below with reference to the following figures and specific examples:

the engine cylinder head gasket sealing structure shown in fig. 1-2 comprises a cylinder block 4 and a cylinder head 1 arranged on the cylinder block 4, wherein a cylinder sleeve 3 is arranged in the cylinder block 4, the cylinder sleeve 2 is arranged between the cylinder block 4 and the cylinder head 1, a supporting boss 41 is arranged on the inner wall of the cylinder block 4, a supporting shoulder 31 is arranged on the outer wall of the cylinder sleeve 3, the supporting shoulder 31 abuts against the supporting boss 41, a boss 33 and a pressing protrusion 32 are arranged on the upper surface of the supporting shoulder 31, a groove 34 is arranged between the boss 33 and the pressing protrusion 32, the pressing protrusion 32 is in interference fit with the cylinder block 2, and the upper surface of the outer periphery of the cylinder block 4 is flush with the edge of the upper surface of the pressing protrusion 32. The cylinder gasket 2 is of a circular ring structure with the upper surface and the lower surface parallel. The boss 33, the groove 34 and the pressing protrusion 32 are all annular structures arranged on the top support shoulder 31 of the cylinder sleeve 3. The outer diameter of the boss 33 is smaller than the inner diameter of the groove 34. The outer diameter of the groove 34 is smaller than the inner diameter of the pressing projection 32. The outer diameter of the boss 33 is smaller than the inner diameter of the head gasket 2. A gap is reserved between the top of the boss 33 and the bottom of the cylinder cover 1. The pressing protrusion 32 has an inner diameter greater than that of the support boss 41. The periphery of the cylinder sleeve 2 is flush with the peripheral edges of the cylinder head 1 and the cylinder block 4. Thus, when in use, the cylinder sleeve 2 is flush with the peripheries of the cylinder head 1 and the cylinder block 4, and the optimal stress structure of the cylinder is better met. The top of the inner periphery of the cylinder body 4 is provided with a chamfer. In this way, the cylinder liner 3 is more convenient when being fitted into the cylinder block 4.

When the invention is used in the actual application,

the top of the cylinder sleeve 3 is formed with a whole circle line sealing structure by the boss 33, the groove 34, the cylinder gasket 2 and the cylinder cover 1, and the inner surface is an annular arc surface.

The cylinder gasket 2 is a flat annular structure with parallel upper and lower surfaces.

The annular groove 34 is arranged between the pressing bulge 32 and the boss 33 at the top of the supporting shoulder 31 of the cylinder sleeve 3, so that the local sealing stress after assembly can be effectively reduced.

The bosses 33 on the top of the cylinder liner 3 do not contact the bottom of the cylinder head 1 after assembly, ensuring that the hold-down protrusions 32 on the top of the support shoulder 31 contact the bottom of the cylinder head 1 through the head gasket 2 and create the required sealing pressure after assembly.

The diameter of the central circle of the top pressing bulge 32 of the supporting shoulder 31 is larger than the inner diameter of the supporting boss 41 of the cylinder block 4, so that the sealing force after assembly is ensured to fall on the supporting boss 41, and the deformation of the cylinder sleeve 3 is prevented from being overlarge.

Finally, it should be noted that the above embodiments are merely representative examples of the present invention. It is obvious that the invention is not limited to the above-described embodiments, but that many variations are possible. Any simple modification, equivalent change and modification made to the above embodiments in accordance with the technical spirit of the present invention should be considered to be within the scope of the present invention.