阅读说明：本技术 一种发动机排气系统密封垫片 (Sealing gasket for engine exhaust system ) 是由 张雷 朱杰 张振平 兰棠洁 刘文元 于 2020-04-14 设计创作，主要内容包括：本发明公开一种发动机排气系统密封垫片,涉及内燃机技术领域,所述密封垫片贯穿设置有排气孔和螺栓安装孔,所述密封垫片包括由上而下叠置的第一层垫片、限位层垫片和第二层垫片,所述第一层垫片和第二层垫片上分别设置内凹底部抵接的内凹弧形密封筋,并环绕所述排气孔；所述限位层垫片设置于所述内凹弧形密封筋外侧；所述螺栓安装孔设置于所述限位层垫片与所述第一层垫片和第二层垫片接触区域。本发明提供的装置不仅解决因高温引起的垫片烧蚀或垫片密封筋疲劳失效导致漏气的问题,还可降低密封筋部位面压过高造成密封面被压凹导致漏气的风险。(The invention discloses a sealing gasket for an engine exhaust system, which relates to the technical field of internal combustion engines and comprises an exhaust hole and a bolt mounting hole in a penetrating manner, wherein the sealing gasket comprises a first layer of gasket, a limiting layer of gasket and a second layer of gasket which are superposed from top to bottom; the limiting layer gasket is arranged on the outer side of the concave arc-shaped sealing rib; the bolt mounting hole is formed in the contact area of the limiting layer gasket and the first layer gasket and the second layer gasket. The device provided by the invention not only solves the problem of air leakage caused by gasket ablation or gasket sealing rib fatigue failure caused by high temperature, but also can reduce the risk of air leakage caused by the fact that the sealing surface is dented due to overhigh surface pressure of the sealing rib.)

1. The utility model provides an engine exhaust system seal gasket, seal gasket is including first layer gasket (1), spacing layer gasket (3) and second layer gasket (2) from top to bottom superpose, still including running through seal gasket's exhaust hole (7) and bolt mounting hole (6), its characterized in that:

the first layer of gasket (1) and the second layer of gasket (2) are respectively provided with an upper concave arc-shaped sealing rib (41) and a lower concave arc-shaped sealing rib (42), and the concave bottom of the upper concave arc-shaped sealing rib (41) is abutted against the concave bottom of the lower concave arc-shaped sealing rib (42) and surrounds the exhaust hole (7);

the limiting layer gasket (3) is arranged on the outer sides of the upper concave arc-shaped sealing rib (41) and the lower concave arc-shaped sealing rib (42);

the bolt mounting hole (6) is formed in the contact area of the limiting layer gasket (3) and the first layer gasket (1) and the second layer gasket (2);

the first layer of gasket (1), the limiting layer of gasket (3) and the second layer of gasket (2) are all metal gaskets.

2. The engine exhaust system sealing gasket according to claim 1, wherein the first layer gasket (1) and the second layer gasket (2) are further provided with an upper half concave rib (51) and a lower half concave rib (52), respectively,

the upper half concave rib (51) surrounds the upper concave arc-shaped sealing rib (41), and the outer side of the upper half concave rib (51) is concave inwards and is in contact with the limiting layer gasket (3);

the lower half concave rib (52) surrounds the lower concave arc-shaped sealing rib (42), and the outer side of the lower half concave rib (52) is concave inwards and is in contact with the limiting layer gasket (3).

3. The engine exhaust system sealing gasket according to claim 1 or 2, wherein the limiting layer gasket (3) is welded to the first layer gasket (1) and the second layer gasket (2), respectively.

Technical Field

The invention relates to the technical field of internal combustion engines, in particular to a sealing gasket for an engine exhaust system.

Background

The exhaust system is an important component of the engine, and with the continuous upgrading of the engine emission, when the engine works, the temperature of high-temperature exhaust gas exhausted from a combustion chamber is higher and higher, and high-temperature gas firstly enters an exhaust manifold through a cylinder cover exhaust passage, then enters a supercharger, finally passes through a supercharger vortex, then enters an exhaust pipeline, and enters the atmosphere after being treated by a catalytic silencer. In order to ensure the normal work and safety of the engine and prevent the leaked high-temperature gas from damaging other parts of the engine and causing damage to human bodies due to high temperature, sealing gaskets with high temperature resistance and good reliability are required to be arranged at the connection parts of the exhaust system.

The sealing gasket structure of the current common exhaust system mainly comprises:

1. a single-layer metal gasket is adopted, and sealing ribs are arranged on the periphery of the exhaust port.

2. As shown in figure 4, four layers of metal gaskets which are welded in an overlapped mode are respectively provided with convex arc sealing ribs facing a sealing surface, the four layers of stainless steel gaskets with the same size structure are welded together, the scheme is high in cost, the requirement on the pretightening force of an exhaust system is high, the surface pressure of the sealing rib is high, and the risk that the sealing surface is dented to cause air leakage exists in the working process.

3. As shown in FIG. 5, two layers of metal gaskets adopting stitch welding are respectively provided with convex arc sealing ribs facing a sealing surface, and two gaskets with the same structure are welded together through uniform welding points.

At present, the following problem exists in current exhaust system seal gasket:

1. is easily ablated at high temperature, thereby causing fatigue failure.

2. The requirement on the pretightening force of an exhaust system is high, the surface pressure of the sealing rib part is too high, and the risk of air leakage caused by the fact that the sealing surface is dented exists in the work process.

Disclosure of Invention

Aiming at the problems in the prior art, the invention provides a sealing gasket for an engine exhaust system, which not only solves the problem of air leakage caused by gasket ablation or gasket sealing rib fatigue failure caused by high temperature, but also reduces the risk of air leakage caused by the fact that a sealing surface is dented due to overhigh surface pressure of a sealing rib part.

In order to achieve the purpose, the technical scheme of the invention is as follows:

a sealing gasket for an engine exhaust system comprises a first layer gasket, a limiting layer gasket, a second layer gasket, an exhaust hole and a bolt mounting hole, wherein the first layer gasket, the limiting layer gasket and the second layer gasket are stacked from top to bottom, the exhaust hole and the bolt mounting hole penetrate through the sealing gasket,

the first layer of gasket and the second layer of gasket are respectively provided with an upper concave arc-shaped sealing rib and a lower concave arc-shaped sealing rib, and the concave bottom of the upper concave arc-shaped sealing rib is abutted against the concave bottom of the lower concave arc-shaped sealing rib and surrounds the exhaust hole;

the limiting layer gasket is arranged on the outer sides of the upper concave arc-shaped sealing rib and the lower concave arc-shaped sealing rib;

the bolt mounting hole is formed in the contact area of the limiting layer gasket and the first layer gasket and the second layer gasket;

the first layer of gasket, the limiting layer of gasket and the second layer of gasket are all metal gaskets.

Furthermore, the first layer of gasket and the second layer of gasket are respectively provided with an upper half concave rib and a lower half concave rib,

the upper semi-concave rib surrounds the upper concave arc-shaped sealing rib, and the outer side of the upper semi-concave rib is inwards concave and is in contact with the limiting layer gasket;

the lower semi-concave rib surrounds the lower concave arc-shaped sealing rib, and the outer side of the lower semi-concave rib is inwards concave and is in contact with the limiting layer gasket.

Furthermore, the limiting layer gasket is respectively welded with the first layer gasket and the second layer gasket.

Compared with the prior art, the invention has the following beneficial effects:

1. the sealing gasket for the engine exhaust system is provided with a limiting layer gasket, the bolt pressing force is mainly concentrated at the limiting layer part, the upper concave arc-shaped sealing rib and the lower concave arc-shaped sealing rib are not completely flattened, two sealing lines can be formed at the contact part of the sealing surface, the pressing force can be kept unchanged, the fatigue failure risk of the sealing rib is reduced, the resilience performance of the gasket is ensured, the problem of air leakage caused by fatigue failure of the sealing rib of the gasket is solved, and meanwhile, the risk of air leakage caused by indentation of the sealing surface due to overhigh surface pressure at the sealing rib part can be reduced;

2. under the high-temperature alternating working condition, if the bolt pressing force is attenuated, the pressing force at the position of the limiting layer is firstly attenuated, and the pressure values at the upper concave arc-shaped sealing rib and the lower concave arc-shaped sealing rib are not basically attenuated, so that the leakage risk caused by the ablation of the gasket due to the leakage of high-temperature gas is prevented.

3. Even the sealed muscle of indent arc has slight seepage, the setting still can prevent high-temperature gas leakage at the first layer of muscle of spacing layer gasket top and the second layer of muscle of below second layer gasket, forms multichannel sealed line, effectively reduces the gas leakage risk.

4. Spacing layer gasket and the welding of first layer gasket and second floor gasket have strengthened spacing layer gasket and first layer gasket and second floor gasket joint strength, reduce the gas leakage risk.

Drawings

FIG. 1 is a top view of an exemplary gasket seal of the present invention;

FIG. 2 is a partial cross-sectional view taken along line A-A of FIG. 1 in accordance with the present invention;

FIG. 3 is a partial cross-sectional view taken along line B-B of FIG. 1 in accordance with the present invention;

FIG. 4 is a schematic structural diagram of a stitch-welded four-layer metal gasket in the prior art;

fig. 5 is a schematic structural diagram of a stitch-welded two-layer metal gasket in the background art.

In the figure, 1-a first layer of gasket, 2-a second layer of gasket, 3-a limiting layer of gasket, 41-an upper concave arc-shaped sealing rib, 42-a lower concave arc-shaped sealing rib, 51-an upper half concave rib, 52-a lower half concave rib, 6-a bolt mounting hole and 7-an exhaust hole.

Detailed Description

In order to explain the technical content, the achieved objects and the effects of the present invention in detail, the following description is made in conjunction with the embodiments and the accompanying drawings.

Fig. 1 is a top view of a sealing gasket of an engine exhaust system, wherein an exhaust hole 7 and a bolt mounting hole 6 are arranged on the sealing gasket in a penetrating way, and a mounting bolt penetrates through the bolt mounting hole 6 to connect the sealing gasket and a required sealing part together.

Referring to fig. 2 and fig. 3, the sealing gasket is formed by stacking three layers of gaskets, namely a first layer gasket 1, a limiting layer gasket 3 and a second layer gasket 2 from top to bottom, wherein the first layer gasket 1, the limiting layer gasket 3 and the second layer gasket 2 are all metal gaskets. Wherein, the first layer gasket 1 and the second layer gasket 2 are respectively provided with an upper concave arc-shaped sealing rib 41 and a lower concave arc-shaped sealing rib 42 around the exhaust hole 7, the concave bottom of the upper concave arc-shaped sealing rib 41 is vertically abutted with the bottom of the lower concave arc-shaped sealing rib 42 to prevent the exhaust hole 7 from air leakage, the spacing layer gasket 3 is arranged at the outer side of the upper concave arc-shaped sealing rib 41 and the lower concave arc-shaped sealing rib 42, the bolt mounting hole 6 is arranged at the contact area of the spacing layer gasket 3 and the first layer gasket 1 and the second layer gasket 2, the bolt pressing force is mainly concentrated at the position of the spacing layer gasket 3, the upper concave arc-shaped sealing rib 41 and the lower concave arc-shaped sealing rib 42 are not completely flattened, the risk that the sealing surface is dented to cause air leakage due to overhigh surface pressure at the sealing rib position can be reduced, and two, and can guarantee that the packing force keeps unchangeable and reduce sealed muscle fatigue failure risk, guarantee the resilience performance of gasket, solve the problem that the sealed muscle fatigue failure of gasket leads to leaking gas. Under the high-temperature alternating working condition, if the bolt pressing force is attenuated, the pressing force at the gasket position of the limiting layer is firstly attenuated, and the pressure values at the upper concave arc-shaped sealing rib 41 and the lower concave arc-shaped sealing rib 42 are basically not attenuated, so that the leakage risk caused by the ablation of the gasket due to the leakage of high-temperature gas is prevented.

Preferably, an upper half concave rib 51 and a lower half concave rib 52 are further arranged on the first-layer gasket 1 and the second-layer gasket 2, the upper half concave rib 51 surrounds the upper concave arc-shaped sealing rib 41, and the outer side of the upper half concave rib 51 is concave inwards and is in contact with the limiting-layer gasket 3; the lower half concave rib 52 surrounds the lower concave arc-shaped sealing rib 42, and the outer side of the lower half concave rib 52 is concave inwards and is in contact with the limiting layer gasket 3. Even if go up sealed muscle 41 of indent arc or the sealed muscle 42 of indent arc down and have slight seepage like this, the setting still can prevent high-temperature gas leakage at the first layer gasket 1's of spacing layer gasket 3 upper and lower half concave muscle 51 and the second layer gasket 2 in half concave muscle 52 down to form multichannel sealed line, effectively reduce the gas leakage risk.

As preferred scheme, spacing layer gasket 3 respectively with first layer gasket 1 and the welding of second layer gasket 2, strengthen spacing layer gasket 3 and first layer gasket 1 and the joint strength of second layer gasket 2, reduce the risk of leaking gas.

Although the invention has been described in detail above with reference to specific embodiments, it will be apparent to one skilled in the art that modifications or improvements may be made based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.