JPS5830090Y2 - Universal joint for exhaust pipe of internal combustion engine - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a universal joint for an exhaust pipe of an internal combustion engine.

In most conventional exhaust system piping, the open side components from the engine's exhaust manifold 1 through the exhaust front tube 2 and muffler 3 to the rear end of the exhaust tail tube 4 are fixed, as shown in Figure 1. 2, or a flexible hose 5 such as a bellows was used as shown in FIG.

These methods can absorb vibrations in the direction perpendicular to the axial direction of the exhaust pipe, etc., if the displacement is small, by elastically supporting the part after the connection point of the engine's exhaust manifold on the frame I with rubber 6 etc. It is.

However, vibration absorption is insufficient when there is large relative movement or vibration between the engine and the parts after the engine, or when there is axial movement.

The present invention eliminates the above-mentioned drawbacks of conventional exhaust system piping and reliably absorbs large relative movements, vibrations, or axial movements between the engine and the parts after the engine. It is an object of the present invention to provide a universal joint for an exhaust pipe of an internal combustion engine.

According to the present invention, one end is connected to the end of the exhaust pipe in the r direction and is provided with a ball joint part having a spherical surface part, and the other end is provided with a slide east part into which the other end of the exhaust pipe is inserted, Adjacent to the slide joint, there is a conical part that increases in diameter toward the ball joint, and the ball joint and slide joint are designed to prevent leakage of exhaust gas on the sliding surfaces and to provide metal contact. A gasket is provided to cut off the
The ball joint part is configured to be rotatable and tiltable with respect to one exhaust pipe, and the slide joint part is configured to be rotatable, tiltable, and slidable.

Therefore, the universal joint of the present invention rotates 360 degrees around the axis of one exhaust pipe at the ball joint portion, and the axis of the exhaust pipe can be tilted in any direction with respect to the axis of the universal joint.

Further, rotation, tilting, and sliding are performed at the slide joint.

Therefore, a universal joint has one end fixed to one exhaust pipe in the axial direction and the other end slidable to the other exhaust pipe.
The universal joint does not fall off from both exhaust pipes due to vibration, etc., and does not require elastic support.

This configuration allows the universal joint to perform any three-dimensional movement.

The gaskets provided on both joints break the metal contact between both exhaust pipes and the universal joint, thereby blocking the transmission of vibrations.

Further, the conical portion allows the tilting angle of the other exhaust pipe inserted into the slide joint portion.

Therefore, it is sufficient to set the inclination angle between the other exhaust pipe and the universal joint in advance due to vibration or the like.

However, even if this angle is limited, further tilting is possible at the ball joint.

When implementing the present invention, the ball joint can connect the exhaust pipe side to either its inner or outer side.

Alternatively, an assembly that engages with the spherical surface of the ball joint may be provided in advance and fixed to the exhaust pipe, so that the exhaust pipe forms a spherical portion that freely engages with the spherical surface of the ball joint. Good too.

Embodiments of the present invention will be described below with reference to the drawings.

Fig. 4 A 5 shows the first embodiment of the present invention, and 11 is fixedly connected to the end of one exhaust pipe (not shown) by flange connection or welding, and has a ball part 11a. The assembly 12 is a socket having a spherical part 12a that engages with the outer peripheral surface of the ball part 11a of the assembly 11, and a conical part 12b whose diameter decreases toward the end opposite to the spherical part 12a. The inner peripheral surface of the spherical part 12a of the socket 120 is engaged with the outer peripheral surface of the ball part 11a of the socket 11, and a gasket, for example, an asbestos gasket 13 impregnated with graphite, is interposed on the sliding surface to connect the retainer 14 and the end of the socket 12. A coupling 15 is fitted around the portion 12c and tightened with a bolt 16 and a nut 17 (ball joint portion A).

Therefore, the retainer 14 and the end 12c of the socket 12
moves in the direction of narrowing the width of the gasket 13, and at this time, the gasket 13 is strongly pressed against the ball portion 11a of the assembly 11, blocking the gap between the hole portion 11a, the retainer 14, and the spherical portion 12a of the socket 120, thereby preventing leakage of exhaust gas. prevent metal contact.

Even in this state, the assembly 11 maintains its ball portion 11a.
It is possible to rotate 360° around the axis at
It can be tilted in any direction around the entire circumference by an angle α of 1.

Therefore, if the flange 11b on the assembly 11 side and the flange of the exhaust pipe 2' on the exhaust manifold 1 side are fixed as shown in FIG.
It becomes possible to tilt in any direction at an angle α centering on Fig. 4 A).

In addition, in FIG. 4A, insert the exhaust pipe 2 into the socket 12 from the end of the conical part 12b of the socket 12 to the position Ll,
The retainer 14 and the end 12d of the socket 12 are surrounded by a gasket 13, such as an asbestos gasket impregnated with graphite, on the sliding surface, and a coupling 15 is fitted around the retainer 14 and tightened with a bolt 16 and a nut 17. (Slide joint part B).

Therefore, similar to the ball joint described above, the retainer 14 and the end 12d of the socket 12 move in the direction of narrowing the width of the gasket 13, and at this time the gasket 13 is strongly pressed against the exhaust pipe 2 to prevent leakage of exhaust gas. and cut off metal contact.

Even in this state, the exhaust pipe 2 can be tilted within the range of the widening surface angle α of the conical part 12b of the socket 12 by external force, and can also be rotated 360' around the axis, and can also be moved to the L1 position in the axial direction. It is possible to slide from the starting point K by the length of L2.

Therefore, the exhaust pipes before and after the universal joint can be offset in the circumferential direction by 360 degrees, and can also be slid in the axial direction by a length of L2.

FIG. 5 shows another embodiment of the present invention, in which the socket 22 is provided with a ball portion 22a corresponding to the ball portion of the assembly of the previous embodiment, and the elasticity of the gasket is improved without using a coupling. It is assembled with interest.

The operation is not much different from that of the previous embodiment, and although the sealing performance is somewhat poor, it can be manufactured at low cost.

Note that 23 represents a gasket, and 24 represents a retainer.

As explained above, the universal joint according to the present invention can rotate and tilt the tube by 360' in the circumferential direction at the ball joint, and can rotate and tilt the same 360' at the slide joint in the axial direction. Since it is movable, that is, any movement in three dimensions is possible, the relative movement before and after this universal joint, for example after the exhaust manifold and exhaust front tube of the engine, is completely decoupled.

In addition, gaskets are applied to the sliding surfaces of the ball joint and slide joint to break metal contact, so vibrations from the engine are not transmitted to the exhaust front tube.

In particular, when a gasket made of graphite asbestos is used, it is particularly effective because graphite asbestos itself has excellent vibration absorption ability.

In this way, vibrations and relative movements are completely absorbed by this universal joint, so there is no need for elastic support like in the past.
Rigid support means (designated 8 in FIG. 3).

) can be taken. It also absorbs the vibration noise caused by the secondary vibration of the exhaust system caused by engine vibration, which eliminates the need for conventional measures such as making the exhaust tube a double pipe or installing a cover on the tube as a countermeasure against secondary vibration noise caused by engine vibration. It is also effective as a noise countermeasure.

Furthermore, the ball joint, which is relatively expensive, is reduced to one piece, and the slide joint, which can be manufactured at a relatively low cost, is configured to be tiltable, so the intended purpose can be achieved and the cost will not be so high. First, especially if the configuration shown in the second embodiment is adopted, it can be manufactured at low cost.

[Brief explanation of the drawing]

1 and 2 are side views showing exhaust system piping of a conventional internal combustion engine. FIG. 3 is a side view showing exhaust system piping for an internal combustion engine using the universal joint according to the present invention. FIG. 4A shows a first embodiment of the present invention, in which FIG. 4A is a side sectional view partially shown in plan, and FIG. 4B is a front view. FIG. 5 is a side sectional view showing a second embodiment of the present invention. 11... Assembly having a ball portion 12...
...Socket with conical part, 13, 23...
...Gasket, 14t24...Retainer-1
5... Coupling, 16... Bolt, 11... Nut, 21... Assy, 22... Ball part and cone part. socket with.

Claims (1)

[Scope of utility model registration request] A universal joint that connects the exhaust pipes of an internal combustion engine, with one end connected to the end of one exhaust pipe, and provided with a bow part having a spherical surface, and the other end into which the end of the other exhaust pipe is inserted. A slide joint is provided, and a conical part adjacent to the slide joint is provided with a conical part that becomes thicker toward the ball joint. A gasket is provided to prevent metal contact and break off metal contact, the ball joint part is configured to be able to rotate and tilt with respect to one exhaust pipe, and the slide joint part is configured to be able to rotate, tilt and slide. A universal joint for the exhaust pipe of an internal combustion engine, characterized by: