JPS628376Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an intake pipe heat shielding device for preventing heating of an intake pipe disposed close to the exhaust pipe of an internal combustion engine due to exhaust heat.

In internal combustion engines, especially those equipped with an exhaust supercharger to increase output, the intake pipe may be located close to the exhaust manifold. is heated by exhaust heat, leading to problems such as a decrease in the intake efficiency of the internal combustion engine, a decrease in output, and deterioration of the intake pipe and its attached parts.

In order to improve such defects,
A heat shielding device has been proposed in Japanese Patent No. 117211, but since the heat shielding member is attached to the exhaust pipe in this device, the heat shielding member becomes a new heat source, and bolts and nuts may seize up and become impossible to remove. is stretched due to thermal expansion, and the installation of heat shield members and brackets becomes loose, and since bolts and nuts are used to attach the parts, installation and removal are troublesome, reducing workability during engine assembly or maintenance during use. There was a risk that this would lead to a decline in sexual performance.

In addition, Utility Model Application Publication No. 51-51960 and British Patent No.
Clips such as those disclosed in the specification of No. 1359150, in which the proximal support portion is attached to a support base such as a wall surface using bolts or an adhesive layer, are suitable for attaching rubber hoses, etc. to internal combustion engines. However, not only does this lead to a decrease in assembly workability and maintainability as described above, but there is also a risk of heat transfer from the support base, making it unsuitable for use in areas that require heat shielding as described above. . The present invention was devised in view of the above points, and is intended to prevent heating of the intake pipe due to exhaust heat in an internal combustion engine in which the intake pipe is disposed close to the exhaust manifold, and to prevent internal combustion caused by heating of the intake pipe. An intake system that prevents reductions in engine intake efficiency and output and deterioration of the intake pipe and its attached parts, and that is easy to install and remove, improving workability in the internal combustion engine assembly process and improving maintainability during use. The purpose of this device is to provide a heat shielding device for pipes, the gist of which is to provide a pipe heat shield device with a length of at least a semicircle and a circumference at the bottom of the intake pipe of an internal combustion engine in which the intake pipe is disposed close to the exhaust manifold. An arcuate elastic clip has rising parts formed by extending outward in two directions and is caulked to the inner circumferential surface of the semi-cylindrical heat shield plate.A mounting part protruding from the above rising part and near the open end is fitted. It is located in the heat shielding device of the intake pipe.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

1 is an internal combustion engine with an exhaust supercharger, 2 is an exhaust manifold that collects exhaust gas from each cylinder, and an exhaust supercharger 4 is installed between the exhaust manifold 2 and the exhaust pipe 3.
is installed. 5 is the intake pipe, and the exhaust manifold 2
The exhaust manifold 2 is connected to the supercharger 4 by extending directly above the supercharger 4, and is connected to the intake manifold 6 disposed on the opposite side of the exhaust manifold 2 via the supercharger 4. Reference numeral 7 denotes an air cleaner, which is attached to the tip of the intake pipe 5. Reference numeral 8 denotes a heat shielding device, which has a length of more than a semicircle and extends outward at two locations in the circumferential direction, as shown in FIGS. A mounting portion 86 is provided protruding near the rising portion 84 of an arcuate elastic clip 82 fixed to the inner circumferential surface of the plate 81 by caulking, and the mounting portion 86 is used to attach the air exhaust manifold 2 of the intake pipe 5. It is designed so that it can be removably fitted into the lower part facing the.

Further, 83 indicates caulking between the heat shield plate 81 and the elastic clip 82, and 87 indicates a reinforcing rib portion formed in the longitudinal direction.

Furthermore, the arc of the elastic clip 82 is made longer than a semicircle as described above, and each attachment portion 8
The diameter of the circle 87 inscribed in the intake pipe 6 is slightly smaller than the diameter of the intake pipe 5 to be attached.

Since the heat shielding device 8 according to the present invention has the above-described configuration, heating of the intake pipe 5 due to exhaust heat from the exhaust manifold 2 is prevented. Problems such as deterioration of attached parts are eliminated.

Furthermore, since the heat shielding device 8 is not attached to the lower part of the intake pipe 5 by the elastic clip 82, it can be easily attached to the lower part of the intake pipe 5. Even if there is variation in the position, the engine moves on the outer periphery of the intake pipe 5 due to vibrations during engine operation and is positioned directly below the intake pipe 5, that is, directly above the exhaust manifold 2, so that positioning is performed automatically. It will be done.

Furthermore, since the heat shielding device 8 is made removable as described above, it is easy to inspect the intake pipe 5 and the supercharger 4 during use.
When repairing or replacing the heat shielding device 8 itself, removal is easy and maintainability is improved.

Further, since a heat insulating gap is created between the intake pipe 2 and the heat shield plate 81 by forming the rising portion 84, the heat shielding effect is further improved.

Furthermore, since the heat shield device 8 is fitted into the intake pipe 2,
Compared to a heat shield installed on the exhaust manifold or exhaust pipe side, deterioration due to exhaust heat is reduced, the durability of the heat shield 8 is improved, and the heat shield 8 itself can be used as a new heat source. This will prevent this from happening.

Further, since the heat shielding device 8 is composed of a semi-cylindrical heat shielding plate 81 and an elastic clip 82, it is possible to provide a heat shielding device that has a simple structure, is inexpensive, and is suitable for mass production.

As described above, the intake pipe heat shielding device according to the present invention is installed at the lower part of the intake pipe of an internal combustion engine in which the intake pipe is disposed close to the exhaust manifold, and has a length of more than a semicircle and a circumferential direction. Attachment of an arc-shaped elastic clip in which rising parts formed by extending outward at two places are caulked to the inner circumferential surface of a semi-cylindrical heat shield plate, and protrudes inward near the rising parts and near the open end. Since it is used as a heat shielding device for the intake pipe by fitting the parts, it has the following effects.

Since the heat shield plate of the heat shield device prevents heating due to exhaust heat from the exhaust manifold, problems such as a decrease in engine intake efficiency, a decrease in output, and deterioration of the intake pipe and its attached parts are eliminated. .

In addition, since the heat shield device does not have to be attached to the lower part of the intake pipe using an elastic clip, it can be easily installed in the internal combustion engine assembly process, and there is no need for variations in the installation process to the intake pipe. However, due to vibrations during engine operation, it moves on the outer periphery of the intake pipe and comes to be located directly below the intake pipe, that is, directly above the exhaust manifold, so that positioning is performed automatically.

Furthermore, since the heat shield device is made detachable as described above, it can be easily removed and maintainability is improved when inspecting or repairing the intake pipe or supercharger during use, or when replacing the heat shield device itself.

Furthermore, since a heat insulating gap is created between the intake pipe and the heat shield plate by forming the rising portion, the heat shielding effect is further improved.

Furthermore, since the heat shield is fitted into the intake pipe, there is less deterioration due to exhaust heat compared to when the heat shield is attached to the exhaust manifold or exhaust pipe side, and the durability of the heat shield is improved. At the same time, the heat shielding device itself is prevented from becoming a new heat source.

Further, since the heat shield device is composed of a semi-cylindrical heat shield plate and an elastic clip, it is possible to provide a heat shield device that has a simple structure, is inexpensive, and is suitable for mass production.

[Brief explanation of the drawing]

Figure 1 is a side view showing one embodiment of the present invention;
The figure is an enlarged side view of the heat shielding device in the example.
The figure is an enlarged front view of the heat shielding device. 1: Internal combustion engine, 2: Exhaust manifold, 4: Exhaust supercharger, 5: Intake pipe, 8: Heat shield device, 81: Heat shield plate,
82: Elastic clip, 83: Caulking portion, 84: Rising portion, 86: Mounting portion.

Claims (1)

[Scope of utility model registration request] At the bottom of the intake pipe of an internal combustion engine in which the intake pipe is disposed in close proximity to the exhaust manifold, a rising portion having a length of a semicircle or more and extending outward at two locations in the circumferential direction is formed. A heat shielding device for an intake pipe, which is formed by fitting mounting portions protruding near the rising portion and near the open end of an arcuate elastic clip caulked to the inner peripheral surface of a cylindrical heat shielding plate.