JPS62279224A - Manifold and manufacture thereof - Google Patents

Abstract

PURPOSE:To reduce the size and the weight of a manifold by constructing the manifold with pipe members while providing a gas leak prevention groove and an anti-rotation groove at the end of a branch pipe then caulking to a flange. CONSTITUTION:A branch pipe 2 is pressure formed through bulging at the sideface of a pipe member 1A constituting a manifold body 1. An anti-gas leak groove 4 and an anti-rotation groove 5 are formed at the end of the branch pipe 2 and a flange 3 is caulked thereto. Consequently, the coupling between the flange member 3A and the branch pipe 2 is strengthened while the weight and the size of the manifold can be reduced.

Description

[Detailed description of the invention] 3. Detailed description of the invention [Purpose of the invention] (Industrial application field) The present invention relates to a manifold and a method for manufacturing the same.

(Prior art) Conventionally, the manifold of the intake and exhaust system between internal combustion lines, especially the exhaust system, has a manifold main body, a branch pipe communicating with each cylinder, and a cylinder block, in which high temperature and high pressure gas flows. It is formed of a cast metal with a flange for fixing it in the middle, and its outer periphery is covered and reinforced.

(Problems to be Solved by the Invention) In the conventional manifold, the manifold itself is bulky, which not only increases the weight of the internal combustion engine but also increases the size, which also imposes restrictions on the layout of the internal combustion engine. There were problems such as.

The present invention has been made with the aim of improving the above-mentioned problems of the prior art.The present invention aims to reduce the cost by constructing the manifold from a pipe material, thereby making the manifold lighter and smaller. The purpose of the present invention is to provide a manifold that can be used in the manufacturing process and a method for manufacturing the same.

[Structure of the invention]

(Means for solving the problem) In order to solve the above problem, the first invention of the present application is as follows:
A manifold main body made of pipe material, a plurality of branch pipes protruding from the side of the pipe in a direction perpendicular to the axis of the pipe material, and flanges at the pipe ends of these branch pipes. and a gas leak prevention groove and a rotation prevention groove formed in the circumferential direction on either the outer circumferential surface of the pipe end of the branch pipe or the inner circumferential surface of a flange member externally fitted on the pipe end of the branch pipe. The second invention of the present application is a manifold characterized in that the outer peripheral surface of the pipe end of the branch pipe is pressed against the inner peripheral surface of the flange member and caulked. A plurality of protruding pipe parts are integrally formed in a direction perpendicular to the axis of the pipe material, and a hole is bored in the end surface of the protruding pipe part protruded by this bulging process, and the circumference thereof is corrected into a straight pipe shape. This forms a branch pipe, and gas leakage prevention Fj J3 is formed in the circumferential direction on either the outer circular surface of the pipe end of this branch pipe or the inner circumferential surface of a flange member fitted externally on the pipe end of the branch pipe. This method of manufacturing a manifold is characterized in that a flange is formed by forming an anti-rotation groove and pressing the outer circumferential surface of the pipe end of the branch pipe against the inner circumferential surface of a flange member.

(Function) With the above configuration, the manifold main body and branch pipes are all made of pipe material, so the overall weight and size of the manifold is significantly reduced, reducing the amount of work required for the manifold. The flange that serves as the "recess" part is fixed to the outer periphery of the end of the branch pipe by caulking, so no welding process is required at all.Moreover, the caulked part is pressure-welded by the combination of the gas leakage prevention groove and the anti-rotation groove, so the exhaust gas can be prevented. Even with high-temperature, high-pressure gases, there is no leakage, and it is firmly fixed.

(Example) The present invention will be described below with reference to embodiments shown in the drawings.

The figure shows an embodiment in which the present invention is applied to an internal combustion exhaust manifold.
Each tube has a number corresponding to 2.2. ... are formed by extrusion in a direction perpendicular to the axis of the pipe material 1A by bulge processing.

Regarding the formation of the branch pipes 2, 2..., a protruding pipe part 1B is formed on the side of the pipe material 1A by bulge processing, as shown in FIG. A hole 1 with a smaller diameter (than the inner diameter of the protruding tube portion 1B on the tube end surface 1C)
D is bored, and then the peripheral edge 1E of this hole 1D is straightened into a straight pipe shape as shown by the chain line to form branch pipes 2, 2, . . .

The branch pipe 2 provided at the end of the pipe material 1A is formed by bending the pipe material 1A in advance and correcting the diameter of the bent portion by bulge processing, as shown in Figure 5. The branch pipes 2°2... can be formed by bulge processing.

l) At the pipe ends of the four branch pipes 2, 2..., lζth flanges 3, 3..., which connect to the shilling block, are attached with mounting numbers. The flange is fixed by caulking as shown in FIG.

As shown in Fig. 2, a gas leakage prevention groove is formed on the joint surface of the branch pipe 2 or the flange member 3△, whichever has the higher hardness (in the illustrated example, the outer peripheral surface of the pipe end of the branch pipe 2). 4 and a rotation prevention groove 5 are formed, and caulking is performed by these grooves.

The gas leakage prevention groove 4 is a plurality of grooves formed in parallel in the circumferential direction of the outer surface of the tube end of the branch pipe 2, and has a mountain-shaped cross section.

The anti-rotation groove 5 is provided in a plurality of grooves in the axial direction of the branch pipe 2, or has a spiral shape or a knurled shape.

Regarding caulking, as shown in FIG. 6 as an example, the flange member 3A is positioned and fixed between the holders 6 and 7, and the pipe end of the branch pipe 2 is inserted into the center of the flange member 3A. It is fixed immovably in the axial direction by means of a fixed means. Thereafter, the expansion rod 8 is press-fitted into the interior of the branch pipe 2 from the end of the branch pipe 2 to expand the branch pipe 2 and swage it as shown in the second figure. As a result, as shown in an enlarged view in FIG. 3, the peaks of the gas leak prevention grooves 4 are press-fitted into the inner circumferential surface of the flange member 3A, so that the two come into close contact, and this close contact occurs over multiple strips, and the adjacent Since the grooves are independent in the axial direction, they are combined in a manner that completely prevents gas leakage. Further, since the peak portion of the rotation prevention groove 5 is press-fitted into the inner circumferential surface of the flange portion +A3A, integration in the rotation direction is achieved.

A required number of bolt holes 9 are drilled in the flange portion +A3A, so that it can be attached to the cylinder block with bolts.

(Effects of the Invention) As described above, in the manifold according to the present invention, since the manifold main body portion and the branch pipe are made of pipe material, the overall weight can be significantly reduced, and since it does not require casting, it is inexpensive. It is also compact and extremely useful in terms of layout.Furthermore, since the flange member and the branch pipe are fixed by caulking, installation into the cylinder block can be done in the same way as before. In addition, the flange member is caulked through a gas leak prevention groove, so there is no need to worry about gas leaks even when high-temperature, high-pressure gas flows like in an exhaust manifold.
Furthermore, the anti-rotation groove strengthens the connection between the flange member and the branch pipe, allowing for strong mounting similar to that of a cast product.

Furthermore, according to the method of manufacturing a manifold according to the present invention, since the branch pipes are formed by bulge processing, there is no need for welding processes, etc. Therefore, productivity is excellent, and at the same time, the continuous part of the branch pipes can be formed in a smooth shape. can be easily done,
Various effects such as smoother gas flow can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a front view showing an embodiment of the manifold according to the present invention, Fig. 2 is a sectional view of the flange portion in Fig. 1, and Fig. 3 shows the caulked state of the gas leakage prevention groove portion in Fig. 2. 4 is a sectional view showing an example of the forming process of a branch pipe, FIG. 5 is a front view showing a modification of the manifold, and FIG. 6 is an example of the means for caulking the flange member in FIG. 1. FIG. 1...Manihole l-''thick 4k mI㻝〉, 1A,,
, pipe 12...branch pipe, 3...flange, 3A・
...Flange member, 4...Gas leak prevention groove, 5...
Anti-rotation groove, 6, 7... holder, 8... expansion rod.

Claims (1)

[Claims] 1. A manifold main body portion made of pipe material, a plurality of branch pipes protruding from the side of this pipe material in a direction perpendicular to the axis of the pipe material, and a plurality of branch pipes of these branch pipes. a flange fitted to a pipe end, and formed in the circumferential direction on either the outer circumferential surface of the pipe end of the branch pipe or the inner circumferential surface of a flange member fitted externally on the pipe end of the branch pipe. A manifold characterized in that a leak prevention groove and a rotation prevention groove are formed, and the outer circumferential surface of the pipe end of the branch pipe is pressed against and caulked to the inner circumferential surface of a flange member. 2. The manifold according to claim 1, wherein the branch pipe is formed on one side of the pipe material by bulge processing. 3. A plurality of protruding pipe parts are integrally formed on one side of the pipe material by bulge processing in a direction perpendicular to the axis of the pipe material,
A branch pipe is formed by drilling a hole in the pipe end surface of the protruding pipe part protruded by this bulging process and straightening the periphery thereof into a straight pipe shape, and forming a branch pipe on the outer peripheral surface of the pipe end of the branch pipe or the pipe end of the branch pipe. Gas leak prevention grooves and anti-rotation grooves are formed in the circumferential direction on one of the inner circumferential surfaces of the flange member that is fitted onto the outside, and the outer circumferential surface of the pipe end of the branch pipe is pressed against the inner circumferential surface of the flange member. A method for manufacturing a manifold, characterized in that a flange is formed by caulking.