JPH0122897Y2 - - Google Patents

Description

[Detailed explanation of the invention] A. Purpose of the invention [Industrial application field] The invention aims at inserting each of a plurality of exhaust pipes on the cylinder side of an internal combustion engine into each branch pipe of a manifold manifold pipe. This invention relates to an exhaust pipe collection device that welds around the exhaust pipes and connects them to one common pipe that leads to a muffler on the downstream side of the exhaust gas.

[Conventional technology/problems]

This type of exhaust pipe collecting device was published in 1973-31288.
Issue: As disclosed in Publication No. 47-19411, etc.
Since the exhaust pipe insertion port of the branch pipe is formed on the same plane perpendicular to the length of the exhaust pipe, welding to the exhaust pipe around the insertion port is troublesome.

That is, the welding torch must be oriented in the direction in which the exhaust pipe extends, and the torch must be moved along the entire circumference of the insertion port, which is extremely difficult to perform. In particular, there is a problem with the angle at which the welding torch is aimed at the narrow corner between both exhaust pipes, which may result in insufficient penetration into the corner, resulting in holes due to weld leakage, or conversely, excessive heating may cause burn-through. Sometimes.

Furthermore, because of the above relationship, the torch does not hit each part uniformly, resulting in uneven welding distortion and reduced dimensional accuracy, which must be corrected while heating. Furthermore, since non-uniform stress remains inside the pipe, it is troublesome to add reinforcing patches or pipes.

Therefore, there are problems such as extremely poor work efficiency and poor finished appearance, and the need for a high degree of skill. The present invention aims to improve these problems.

B. Structure of the invention [Means for solving the problem] The invention consists of a plurality of exhaust pipes 2 on the cylinder side of an internal combustion engine.
into each of the branch pipes 11 and 12 of the manifold collecting pipe 1, welding around the insertion ports, and communicating with one common pipe 10 leading to a silencer on the downstream side of the exhaust pipe. In each branch pipe 11, 12
With respect to a common plane passing through the center of This is an exhaust pipe assembly device with different welding positions.

[Effect]

As mentioned above, if the upper half a and the lower half b of the exhaust pipe insertion ports of the branch pipes 11 and 12 are arranged at different positions in the front and back, the upper part a and the lower part b of each of the Work can be carried out on each side by aiming the welding torch from above the exhaust pipe 2 from substantially the same direction. Difficult spots in narrow corners between adjacent exhaust pipes can be clearly seen because they are on one side, and the aiming angle of the welding torch can be approximately the same, making it easy and stable to weld.

〔Example〕

In the embodiment shown in Fig. 1, the collecting pipe 1 is divided into upper and lower halves.
a and 1b, and the upper side 1a and lower side 1b of the exhaust pipe 2 are staggered in the longitudinal direction by a length l in the exhaust pipe extension direction.

With this configuration, the upper and lower exhaust pipe insertion ports a and b
, as well as the contact end surfaces c and d of the upper and lower half-split pipes 1a and 1b, and the long protruding lower half-split pipe 1.
A strong connection can be obtained by also welding the portion e of length l of the edge of the exhaust pipe receiving groove b.

Figure 2 shows a bifurcated manifold pipe 3 in which a common pipe 10 and branch pipes 11 and 12 are integrally formed by press-molding pipe material.
In this case as well, processing is performed before or after press forming so as to form a length difference of 1 on the exhaust pipe insertion port side.

FIG. 3 shows one branch pipe 12 in the example shown in FIG.
Weld the mating surfaces of both branch pipes 11 and 12 by positioning the exhaust pipe insertion ports a _and b of the other branch pipe 11 by a length l ₁ behind the exhaust pipe insertion ports a 1 and _{b 1} of the other branch pipe 11. The surface is lengthened by f.

Although the drawings illustrate two exhaust pipes 2, the present invention can also be applied to the case of two or more manifold pipes, and the greater the number of pipes, the better the effect will be.

[Effect of idea]

Since the present invention has the above-mentioned configuration, as described in the operation section, the welding work is facilitated, uniform welding is performed at each part, and the various problems described in the problem section are solved.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of an example in which the present invention is applied to a manifold manifold pipe of upper and lower half pipe type, Fig. 2 is an embodiment in which the present invention is applied to a manifold manifold pipe constructed by press forming pipe materials, The figure shows an example in which the exhaust pipe insertion ports are arranged in two stages, with front and back staggers in the example shown in Figure 2. 1, 3...Manifold pipe, 11, 12...Branch pipe, 10...Common pipe, 2...Exhaust pipe, 1a, 1b
... Upper and lower halves of the branch pipe section, a, b... Upper and
Each exhaust pipe insertion port in the lower half portions 1a and 1b, l...The front and back mismatched lengths of the upper insertion port a and the lower insertion port b.

Claims (1)

[Scope of utility model registration request] Insert each of the multiple exhaust pipes on the cylinder side of the internal combustion engine into each branch pipe of the manifold pipe, weld around the insertion port, and communicate with one common pipe leading to the muffler on the downstream side of the exhaust. In an exhaust pipe collection device, the exhaust pipe insertion ports of the upper and lower halves of the branch pipe section are staggered forward and backward in the longitudinal direction of the exhaust pipe with respect to a common plane passing through the center of each branch pipe. An exhaust pipe gathering device with different welding positions on the upper and lower surfaces.