KR200324882Y1 - Support reinforcement structure of inner blade of flexible joint for automobile exhaust pipe - Google Patents

Abstract

The present invention relates to an inner braid in a flexible joint that absorbs shock and vibration in an engine exhaust pipe line of an automobile. Flexible joints for engine exhaust pipes include bellows (2) corrugated with corrugated metal pipes to absorb vibrations and deformations transmitted to the exhaust line, and outer braids (1) braided by wire members to protect them from external shocks. It is also composed of an inner braid (3) to reduce the fluid resistance and the exhaust noise by the bellows of the exhaust gas by braiding the cylindrical member with a wire member and a large diameter coupling ring (5) for fixing both ends by combining them. In particular, the inner braid has a very large change in the inner diameter depending on the engine operating conditions due to the characteristics of the braid, and sometimes the inner diameter is excessively reduced to reduce the efficiency of exhaustion, and also due to the heat and pressure of the engine exhaust gas emitted by the use of a vehicle. There is a structural problem that gradually hardens and ultimately hardens to a state (d) in which the inner diameter is narrowed, which causes the exhaust gas to be disturbed.

Therefore, the present invention is characterized by inserting a tubular wire mesh (mesh) into the support reinforcing device inside the inner braid so as to maintain the inner diameter of the inner braid stably.

Description

Support reinforcement structure of inner braid of flexible joint for automobile exhaust pipe

The present invention relates to an inner braid of a flexible joint that absorbs shock and vibration in an engine exhaust pipe line of an automobile. More specifically, the braid is flexible in structure, and the inner diameter is often narrowed according to the environment of use, and thus the internal diameter of the braid is often narrowed. Therefore, such a weak structure is improved, thereby improving the structural efficiency and durability of the product. I would like to.

The engine which is a combustion engine is provided with the exhaust pipe of the exhaust gas discharged after combustion. However, vibrations and shocks from combustion explosions in the engine are transmitted to the exhaust pipe. If a device that absorbs these vibrations and shocks is not separately installed, the engine and the exhaust pipe cannot be operated normally due to the vibrations and shocks, and the damage and lifespan are shortened rapidly. Therefore, these vibration and shock absorbing devices are very important as a means of protecting other expensive devices at low cost. That's what flexible joints do. Further subdividing the structure, the flexible joint is a bellows (2) corrugated with corrugated metal pipes to absorb vibrations and deformations transmitted to the exhaust line, and an outer braid (1) which is braided and wrapped around the bellows to protect it from the outside (1). And an inner braid 3 for reducing fluid resistance and exhaust noise due to the bellows of the exhaust gas by braiding a cylindrical shape with a wire member, and a large-diameter coupling ring for fastening and fixing them at both ends.

In particular, the braid used for this inner braid is a very thin stainless steel wire (0.2mm to 0.5mm), which is braided into a flat plane with many wires layered, so that the gap is small but the elasticity is good, and the change in the inner diameter is very large. There are severe characteristics. As shown in Fig. 4, the internal diameter is also deformed according to the exhaust conditions, some of which are excessively inflated (c) and some of which are too narrow (d), which decreases the efficiency of exhaustion and also prolongs the period of use of the vehicle. According to the heat and pressure of the engine exhaust gas that is continuously discharged gradually hardened into a sieve narrowed in a certain portion has a problem that ultimately causes the exhaust gas emissions obstruction.

As a countermeasure for the change in the diameter of the inner braid, there is a Japanese Utility Model Publication No. Hei 4-129833, which has a structure in which a spring wire is formed inside the inner braid, and the Korean Utility Model Publication No. 20-0212146 The reinforcing piece is put in the middle of the inner braid and welded. The spring wire method reduces the bellows' ability to absorb the compression and bending phenomena, and is continuously exposed to high temperature exhaust gases, which cannot be expected due to thermal deformation and hardening of the spring. In addition, the welding method of the reinforcing piece distorts the function of the bellows to absorb the vibration generated by the engine and the absorption of shock from the outside evenly when welded to the specific part, and early fatigue of the specific part is prevented. At the same time, there is a problem in that the bellows heat change due to welding heat shortens corrosion and lifespan.

The problem of inner braid is that the metal wire has a dense shape because the metal wire is braided in the plane, but the braided structure is wide and loose, so that the structural stability is low and the elasticity is large. Easily changing the shape of the inner diameter is a serious problem in the essential requirements of the inner braid (3) is required to maintain a constant inner diameter. Therefore, it is a problem that the present invention has to be made to compensate for the self-shape holding ability which is an unstable element of the inner braid. At the same time, the inner braid should not impair the original characteristics of the impact and noise reduction of the exhaust gas bellows, while at the same time not affecting the bellows function.

In the present invention, a cylindrical wire mesh (mesh) or expanded mesh having magnetic shape retaining force inside the inner braid and not being stretched arbitrarily is inserted and installed as a support reinforcement means of the braid to maintain the inner diameter of the inner braid stably. The purpose is to maintain the inner braid cylindrical shape while maintaining the inner braid function by passing the exhaust gas through the mesh space.

1: Half section of flexible joint for automobile exhaust pipe

Figure 2: Half cross-sectional view of the inner braid provided with the mesh of the present invention

Figure 3: Shape diagram for each type of inner braid installation wire mesh of the present invention

Figure 4: Modified perspective view of a conventional inner braid

5: Circular perspective view of a conventional inner braid

Explanation of symbols for the main parts of the drawings

1: outer braid 2: bellows

3: inner braid 4: wire mesh device

5: large diameter coupling ring 6: small diameter coupling ring

11: large diameter outer crimping ring body 32: large diameter inner support ring body

33: Small-diameter outer crimping ring body 34: Small-diameter inner support ring body

41: wire mesh (net) 42a, 42b: jam prevention terminal

The configuration of the present invention will be described in detail with reference to the drawings.

Flexible joints are used to prevent shock and vibration caused by the operation of the engine in the engine exhaust pipe line of the vehicle. 1 is a half sectional view of a flexible joint. As shown in the figure, the flexible joint is a bellows (2) that absorbs vibration, shock and deformation, which are the original functions, an outer braid (1) wrapped around the outside to protect it from external shocks, and the inside of the bellows to prevent noise and shock from exhaust gases. In the known flexible joint consisting of a reducing inner braid (3) and a large diameter coupling body (5) which holds and fastens it at both ends,

In particular, the inner braid (3) is the shape of the original state before the deformation formed by the inner diameter of the cylindrical braid is uniformly reduced from the ultra-large diameter inner support ring (32) as shown in Figure 5 to the small diameter coupling ring (6) at the end ( 5) the shape of the braid 31 is deformed and distorted as shown in FIG. 4 due to the constant pressure and heat change of the exhaust gas, so that some parts are excessively convex (c) and some are bottlenecks (d) inside the inner braid. It is made to act to hinder the emission of exhaust gas.

Therefore, in order to reduce the deformation of the inner braid, a cylindrical mesh 4 made of a wire mesh or an expanded mesh inside the inner braid 3 is installed inside the inner braid, thereby preventing unstable deformation characteristics of the braid 31. It is intended to be supported and reinforced by the cylindrical wire mesh device 4.

In order to install the wire mesh 41 inside the inner braid 3, one side of the cylindrical wire mesh is fixed to the large-diameter coupling ring body 5a, and the inner diameter thereof is diminished, and the end is bent inward so as not to be caught by the inner braid. The wire mesh is configured to form a locking prevention terminal 42a so as to secure a clearance by extending up to the inside of the small-diameter coupling ring body 6 of the inner braid so that the inner braid can still maintain the cylindrical shape while maintaining the elasticity. Fixing device 4a, the cylindrical wire mesh on one side, is fixed to the small-diameter coupling ring body 6, which is the end of the inner braid, and extends the cylindrical mesh of uniform inner diameter or increasing size of the inner diameter on the other side. The end of the structure is formed of a mesh preventing terminal 42b is installed toward the large-diameter coupling ring body 5a, which is an engine exhaust gas inlet direction. The inner diameter should be of a size to prevent bottlenecks, and the length should be at least 1/2 of the inner braid, or a wire mesh device 4b or a wire mesh directly welded or knotted at least one point in the middle of the inner braid. And a wire mesh device 4c having a structure that is coupled to each other and forms locking prevention terminals 42a and 42b at both ends.

In the present invention, inner braid of tubular wire mesh (net) or expanded mesh with magnetic shape retaining force inside the inner braid and not stretched arbitrarily can be maintained in order to maintain the aperture of the inner braid with a large change in inner diameter. By inserting into the supporting reinforcement means to insert the inside of the preservation to the cylindrical shape by passing the exhaust gas passing through the space of the mesh evenly through the braid can maintain the inner braid function and has a characteristic that does not adversely affect the bellows.

By doing so, it is possible to avoid the expansion and contraction function of the bellows generated by the conventional spring-applied method, and to prevent the bellows from shortening the life of the bellows due to the thermal shock caused by welding by the welding of the reinforcing piece. And also it can be expected that the effect of eliminating the problem of the exhaust gas flow caused by the reinforcing piece.

Claims (3)

Bellows (2), an outer braid (1) wrapped for external impact protection, and an inner braid (3) located inside the bellows (2) to reduce exhaust gas resistance and noise, and a large diameter for coupling and fixing them at both ends In the known flexible joint composed of the coupling ring (5), a cylindrical wire mesh (mesh) is inserted in the inner braid 3 to maintain a cylindrical shape, but one side thereof has a large mesh inner diameter for fixing to the inlet side of the exhaust gas. A wire mesh device 4a formed by forming and enclosing on the large diameter inner support ring body 32 of the large diameter coupling ring body 5a and diminishing the inner diameter of the wire mesh while extending to the other end of the wire mesh. The support reinforcement structure of the inner braid of the flexible joint for automobile exhaust pipe, characterized by inserting into the inner braid (3). The method according to claim 1, wherein one side of the cylindrical wire mesh is fixed to the inner ring 34 of the small-diameter coupling ring body 6 at the narrow end of the inner braid, and the inner diameter is uniformly or incrementally extended and extended toward the exhaust gas inlet. A support reinforcement structure of the inner braid of the flexible joint for automobile exhaust pipe, characterized in that the other side inserts a wire mesh device (4b) formed of the locking terminal (42b) into the inner braid. The method according to claim 1, wherein the mesh device 4c having the locking terminals 42a and 42b formed at both ends of the mesh is inserted into the inner middle of the inner braid, and at least one point is bundled and welded or metal wired. Support reinforcement structure of inner braid of flexible joint for automobile exhaust pipe.