JPH078810Y2 - Engine exhaust insulator mounting structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an exhaust insulator mounting structure for an engine.

(Prior Art) Conventionally, an engine exhaust manifold was composed of cast parts and there was no variation in the shape and size of each product. Therefore, when mounting an insulator for heat shielding and appearance maintenance, it was formed in a predetermined shape in advance. The method of attaching the insulator to a stud bolt, stud plate, etc. welded to the exhaust manifold by tightening nuts or spot welding is generally adopted, and this mounting structure makes it easy to mount it at a predetermined mounting position on the exhaust manifold. It was possible to attach the insulator accurately.

(Problems to be solved by the invention) However, from the viewpoint of manufacturing cost reduction, in recent years, an exhaust manifold of an engine, which is configured by an assembly of bent pipes, has been adopted. In such an exhaust manifold, there are variations in the shape and dimension of each product due to an error in the bending process of the pipes and an error in the setting positional relationship of the pipes when assembling the pipes. The insulator mounting method has a problem that an insulator formed in a predetermined shape in advance cannot be easily and accurately mounted at a predetermined mounting position on the exhaust manifold.

(Purpose of the Invention) The present invention is configured in view of the above problems, and is formed of an assembly of bent pipes, and is provided at a predetermined position on an exhaust manifold where there are variations in shape and dimension for each product. An object of the present invention is to provide an engine exhaust insulator mounting structure capable of easily and accurately mounting an insulator formed in advance in a predetermined shape.

(Structure of the Invention) The above object of the present invention is to provide an engine exhaust insulator mounting structure for mounting an insulator to an exhaust manifold composed of a plurality of bent pipes, having an insulator mounting bracket, and the bracket. A pair of deformable leg portions that come into contact with the outer peripheral surface of the pipe forming the exhaust manifold at positions spaced apart in the circumferential direction of the pipe, and the leg portions are connected to each other. A base portion provided between the leg portions, the base portion having a threaded portion that is screwed with a mounting means for mounting the insulator to the pipe, and the leg portion is welded to the pipe. Thereby fixing the insulator mounting bracket to the exhaust manifold, and attaching the insulator to the insulator by the attaching means. The exhaust insulator mounting structure of the engine, characterized in that fixed to the Regulator mounting bracket is achieved.

According to the above configuration of the present invention, the variation in the shape and size of each exhaust manifold is caused by the width for the insulator mounting bracket to hold the pipe forming the exhaust manifold, and thus the insulator mounting bracket fixed to the exhaust manifold. Can be absorbed by adjusting the height of, so that an insulator formed in a predetermined shape in advance can be easily and accurately attached to a predetermined position on the exhaust manifold where the shape and size of each product vary. .

Embodiment An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a perspective view showing an entire structure of an engine exhaust insulator mounting structure according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a diagram showing a method of attaching the insulator mounting bracket to the exhaust manifold.

FIG. 4 is a cross-sectional view corresponding to FIG. 2, showing a different shape of the insulator mounting bracket shape.

In FIG. 1, 1, 2, 3 and 4 are independent exhaust pipes made of bent stainless steel pipes, and the independent exhaust pipes 1, 2, 3 and 4 are assembled by a flange 5 and a boss 6. Together, they form the exhaust manifold 7. The upstream portion 7a of the exhaust manifold 7 has a flange 5
It is attached to the engine head by nine bolts 8 penetrating therethrough, while the downstream portion 7b of the exhaust manifold 7 is connected via a flange 9 to a collective exhaust pipe (not shown).

Insulator mounting brackets 10, 11, 12 and 13 are mounted at predetermined positions of the exhaust manifold 7 using a mounting jig B shown in FIG. 3 so as to have a predetermined height. , Brackets 10, 11, 12, 13 have
Exhaust manifold 7 via bolts 14, 15, 16 and 17
Insulator 18 made of aluminum-plated steel for heat shielding and appearance maintenance, which is preformed in a predetermined shape to cover the outer shape of the
Is installed.

The insulator mounting brackets 10, 11, 12, and 13 each have a U-shaped cross section in which the open side is wider than the closed side, as shown in FIG. The exhaust manifold 7 is spot-welded and attached to the exhaust manifold 7 with the pipes constituting the exhaust manifold 7 sandwiched therebetween.

As shown in FIG. 2, the brackets 10, 11, 12, and 13 each include a pair of legs 11a and 11a and a base 11b that interconnects the legs 11a and 11a, and the base 11b is a bolt. 14, 1
It has a screwing portion 11c into which 5, 16, 17 can be screwed. Leg 11
The a is abutted on the outer surfaces of the exhaust pipes 1, 2, 3, 4 at intervals in the circumferential direction of the pipe wall and is welded to the outer surfaces of the pipes.

The procedure for attaching the insulator 18 to the exhaust manifold 7 will be described below with reference to FIG.

A mounting jig B having a shape matching the shape of the insulator 18 in the vicinity of predetermined positions for mounting the brackets 10, 11, 12, 13 on the manifold 7 is prepared. Mounting jig B
Is composed of three template plates B1, B2, B3 and connecting members B4, B5. The template plate B1 is the bracket 10, the template plate B2 is the brackets 11 and 12, and the template plate B3 is the bracket 13, respectively. Insulator 18
The shape of each template is determined so as to match the shape of, and the relative positional relationship is determined by the connecting members B4 and B5.

Bracket on manifold 7, on templates B1, B2, B3
Brackets 10, 11, 12, and 13 are temporarily fixed to the positions corresponding to predetermined mounting positions of 10, 11, 12, and 13 using bolts.

At the bracket mounting position on the exhaust manifold 7,
The brackets 10, 11, 12, 13 are aligned, and at that position, until the brackets 10, 11, 12, 13 respectively sufficiently clamp the facing portion on the exhaust manifold 7, , 13 are temporarily fixed, and the position of the mounting jig B is adjusted, and the mounting jig B is pressed against the exhaust manifold 7 and pushed in.

The insulator mounting brackets 10, 11, 12, 13 have a U-shape in which the open side is wider than the closed side, and the opening on the open side elastically changes under the pressing force toward the open side. Since the mounting jig B to which the brackets 10, 11, 12, and 13 are temporarily fixed is pressed against the exhaust malhold 7, and pushed in, the variation in the shape and size of the exhaust manifold 7 for each product, and thus the bracket Even if there is a three-dimensional variation in the mounting predetermined position, the width at which the release side of the brackets 10, 11, 12, 13 clamps the exhaust manifold, that is, the opening, in other words, the mounting brackets 10, 11, 12, By changing the height (pushing amount) at the mounting position of 13, the brackets 10, 11, 12, 13 are moved to the insulator 18
At the mounting position of the brackets 18, the brackets 10, 11, 12, with the facing portions of the exhaust manifold 7 being sufficiently sandwiched so as to match the shape of the insulator 18,
13 can be positioned.

When the brackets 10, 11, 12, and 13 are at a position where the insulator 18 is attached and the opposing portions of the exhaust manifold 7 are sufficiently sandwiched so as to match the shape of the insulator 18, the attachment fixing is performed. The pushing of the tool B into the exhaust manifold 7 is stopped, and the brackets 10, 11, 12, and 13 are fixed to the exhaust manifold 7 by spot welding. Next, the temporary fixing bolts are removed, and the mounting jig B is removed from the brackets 10, 11, 12, 13.

The insulator 18 is attached to the brackets 10, 11, 12, 13 using bolts 14, 15, 16, 17. bracket
10, 11, 12, and 13 use the mounting jig B having a shape that matches the shape of the insulator 18, and use the exhaust manifold 7
Therefore, even if the pipes 1, 2, 3, 4 of the exhaust manifold 7 have variations in the shape and size of each product, the brackets 10, 11, 12, 13 are not It is fixed at the mounting position, so that the insulator 18 is placed at a predetermined position on the exhaust manifold 7,
It can be installed easily and accurately.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and it goes without saying that various modifications can be made within the scope of the invention described in the scope of claims for utility model registration. Yes. For example, all or part of the insulator mounting brackets 10, 11, 12, 13 may adopt a cross-sectional shape in which the release side end is bent outward as shown in FIG. 4 as the cross-sectional shape. .

(Effect of the Invention) According to the present invention, the insulator is attached to the exhaust manifold, which is composed of a plurality of bent pipes, and thus has a variation in shape and dimension for each product, via an insulator mounting bracket. . The insulator mounting bracket includes a pair of deformable leg portions that come into contact with the outer peripheral surface of the pipe wall of the pipe that constitutes the exhaust manifold at spaced positions in the circumferential direction. Is fixed on the pipe of the exhaust manifold via. Therefore, variations in the size and shape of the pipe can be absorbed or compensated for by changes in the opening of the legs of the insulator mounting bracket, which makes it easy to install the preformed insulator at the desired mounting position on the exhaust manifold. Further, it is possible to provide an exhaust insulator mounting structure for an engine that can be mounted accurately.

[Brief description of drawings]

FIG. 1 is a perspective view showing an entire structure of an engine exhaust insulator mounting structure according to an embodiment of the present invention. FIG. 2 is a sectional view taken along the line AA of FIG. FIG. 3 is a diagram showing a method of attaching the insulator mounting bracket to the exhaust manifold. FIG. 4 is a cross-sectional view corresponding to FIG. 2, showing a different shape of the insulator mounting bracket shape. 1, 2, 3, 4 ... Independent intake pipe, 7 ... Exhaust manifold, 10, 11, 12, 13 ... Insulator mounting bracket 14, 15, 16, 17 ... Bolt, 18 ... Insulator, B
...... Mounting jig.

Claims (1)

[Scope of utility model registration request] 1. An exhaust gas insulator mounting structure for an engine, wherein an insulator is mounted on an exhaust gas manifold composed of a plurality of bent pipes, wherein an insulator mounting bracket is provided, and the bracket constitutes the exhaust gas manifold. A pair of deformable leg portions that come into contact with the outer circumferential surface of the pipe wall at positions spaced apart in the circumferential direction of the pipe, and between the leg portions so as to interconnect the leg portions. And a base portion, the base portion having a threaded portion that is screwed into a mounting means for mounting the insulator to the pipe, and the insulator mounting bracket by welding the leg portion to the pipe. Is fixed to the exhaust manifold, and the insulator is attached to the insulator mounting bracket by the attaching means. Exhaust insulator mounting structure of the engine, characterized in that fixed to.