JP2000329014A - Joint structure of surge tank in intake manifold - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce weight and cost, and surely ensure air-tightness by dividing and forming surge tanks, holding a sheet shaped raw material including flux, temporally fixing a divided part with an aluminum bolt, and then joining a main body part and the divided part in a furnace. SOLUTION: In an aluminum surge tank 1, a sheet raw material 12 including flux is held between a joining seat part 2a of a main body 2 and a joining seat part 3a of a branched part 3, a joining part is fastened with an aluminum bolt the branched part 3 is temporally fixed, the whole is entered and heated into a furnace, and then the main body part 2 and the branched part 3 are air-tightly joined in the furnace. The main body part 2, the branched part 3, and the bolt 13 are made of aluminum, those heat expansion coefficients are same, surplus stress is not generated at the time of thermal expansion, the main body part 2 and the branched part 3 are thinned, and those weights are lightened. Accordingly, manufacturing costs are reduced, air-tightness is ensured by the sheet shaped raw material including flux, and joining operation can be enabled.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joining structure of a surge tank in an intake manifold.

[0002]

2. Description of the Related Art Conventionally, as shown in an exploded front view of FIG. 4 and a right side view of FIG. In joining the part 2 and the divided part 3, a gasket 6 made of metal or the like is sandwiched between the two, and the bolts 7 are tightened to join them in an airtight manner. In the drawings, reference numeral 4 denotes a branch pipe, and reference numeral 5 denotes a cylinder head mounting flange. In such a joint structure, in order to secure the airtightness between the main body 2 and the divided portion 3, the number of the bolts 7 must be increased, and the rigidity of the tightened portion of the bolts 7 must be increased. In order to increase the strength of the male screw and the female screw at the part to be fastened, a hanging length of 1.5 to 2 times the diameter of the bolt 7 is required, and the length of the bolt 7 and the thickness of the seat surface for tightening the bolt 7 are required. However, there is a problem that the weight increases and the cost increases.

As shown in a front view of FIG. 6 and a side view of FIG. 7, a main body 2 and a divided portion 3 of a surge tank 1 are fixed by fixing jigs 10, 10, and in this state, a furnace There is a method of joining in a furnace by putting it in, but in such a method,
In order to fix with the fixing jigs 10, 10, a large clamping seat surface 9 for fixing must be formed at the joint portion between the main body 2 and the divided portion 3, which increases the weight and increases the cost. There is a problem.

Further, as shown in the front view of FIG. 8 and the side view of FIG.
Is fixed from both ends in the longitudinal direction with fixing jigs 11 and 11 and then put in a furnace in this state and joined in the furnace. As shown in FIGS. When the whole is fixed by the fixing jig 11, the surge tank 1 is thermally deformed in the furnace and destroyed due to a difference in the thermal expansion coefficient between the fixing jig 11, the main body part 2 and the divided part 3 constituting the surge tank. Due to the danger, the main body 2 and the divided part 3 need to be formed thick in order to make the surge tank 1 rigid, and there is a problem that the material cost is increased and the weight is increased. Furthermore, the fixing jig 11 must be attached and detached before and after the in-furnace joining, which is troublesome and increases the manufacturing cost.

[0005]

SUMMARY OF THE INVENTION The present invention has been devised in view of the above-mentioned conventional problems, and can reduce the weight, reduce the cost, and assemble a surge tank while ensuring reliable airtightness. The first point of the invention is to provide a surge tank having a main body part and a divided part, which are formed by splitting a flux-containing sheet-shaped brazing material into aluminum bolts. After being temporarily fixed in the furnace. Also, the second
The gist of this is that the surge tank is composed of a main body and a splittable lid, and the joints of both are sandwiched by a flux-containing sheet-shaped brazing material, temporarily fixed with aluminum bolts, and then joined in a furnace. That is.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an exploded front view of the first embodiment, and FIG. 2 is a right side view of FIG. In the figure, a main body 2 of a surge tank 1 is made of aluminum, and an opening 2b is formed at the left end thereof.
A joint seat portion 2a is integrally formed on the outer periphery of the outer peripheral portion of the joint member so as to protrude outward, and upper ends of four branch pipes 4 formed of wrought aluminum are connected to the main body portion 2. Further, the lower end side of each branch pipe 4 is connected to a cylinder head mounting flange 5 for mounting to the cylinder head.

[0007] From the opening 2b side of the main body 2, a caulking for positioning the branch pipes 4, an end pipe expansion processing of the branch pipes 4, and a weir processing to prevent the flow of the brazing material are performed.
The opening 2b is formed.
b, a separate aluminum dividing portion 3 is joined to the joining portion 2a.
A joint seat portion 3a protruding outward is formed so as to be aligned.

[0008] Between the joining seat portion 2a of the main body portion 2 and the joining seat portion 3a of the dividing portion 3, there is provided a sheet-like brazing material 12 containing a flux.
In this state, aluminum bolts 13, 13 are inserted into bolt holes 8, 8, 8 respectively formed in the joint seats 2a, 3a, and the aluminum bolt 13 is tightened. It is possible to temporarily fix the divided portion 3 to the main body portion 2, put the whole in a furnace in a state where the temporarily fixed portion is fixed, heat in the furnace, and join the main body portion 2 and the divided portion 3 in the furnace in an airtight manner. You can do it.

In the case of joining in a furnace, the main body portion 2 and the divided portion 3 of the surge tank 1 are made of aluminum, and the bolts 13 are also made of aluminum. Since the surge tank 1 is not broken, the main body 2 and the divided portion 3 can be made thinner and lighter, and the branch pipe joined to the main body 2 can be reduced. 4
Can also be heated and joined in the furnace at the same time,
The manufacturing time can be reduced, and the joining seat 2
a, 3a and the aluminum bolt 13 need only be able to withstand thermal deformation in the furnace.
The length of the bolts 13 and the thickness of the joint seats 2a and 3a can be small, and the number of bolts 13 can be reduced. It is also possible to reduce the cost, reduce the material cost, and manufacture the intake manifold at a reduced cost.

FIG. 3 shows a second embodiment. In FIG. 3, one end of a plurality of branch pipes 4 is connected to the main body 2 of the surge tank 1 from both sides. The lid 14 is formed to be joined to the main body 2, and the lid 14 is also made of aluminum. Bolt holes 12 a and 12 are provided between the lid 14 and the main body 2.
The bolt holes 1 formed in the lid 14 in this state with the flux-containing sheet material 12 having a
The aluminum bolt 15 is passed through each of 4a and 14a, and the aluminum bolt 15 is tightened to the main body 2 side. With the lid 14 fixed to the main body 2 by the aluminum bolt 15, the whole is put into a furnace. By heating, the lid 14 can be hermetically bonded to the main body 2 in the furnace in the furnace. In this example, no extra stress is generated during thermal expansion during the furnace bonding. The portion 2 and the lid 14 can be made thinner and lighter, the number of bolts 15 can be reduced, and the cost can be reduced.

[0011]

According to the joint structure of the surge tank in the intake manifold of the present invention, the surge tank is formed so as to be divided into a main body portion and a divided portion. Temporarily fixed in the furnace and then joined in the furnace, so that no extra stress is generated during thermal expansion during furnace joining, it is possible to reduce the thickness and weight and reduce the number of bolts This has the effect of reducing the manufacturing cost, and ensuring the airtightness of the sheet material with the flux-containing sheet material for joining.

The surge tank is composed of a main body and a splittable lid, and the joining portion of the two is temporarily fixed with aluminum bolts with a flux-containing sheet-shaped brazing material sandwiched therebetween and then joined in a furnace. By doing so, no extra stress is generated during thermal expansion during in-furnace bonding, so that the main body and the lid can be made thinner and lighter, the number of bolts can be reduced, and the cost can be reduced. It has the effect that it can be manufactured with reduction.

[Brief description of the drawings]

FIG. 1 is an exploded front view of an intake manifold according to a first embodiment.

FIG. 2 is a right side view of FIG.

FIG. 3 is an exploded perspective view of an intake manifold according to a second embodiment.

FIG. 4 is an exploded front view showing a conventional joint structure by bolting.

FIG. 5 is a right side view of FIG. 4;

FIG. 6 is a front view showing a configuration in which a conventional fixing jig is used to hold and join in a furnace.

FIG. 7 is a side view of FIG. 6;

FIG. 8 is a front view showing a configuration in which the members are fixed by different fixing jigs and joined in a furnace.

FIG. 9 is a side view of FIG. 8;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Surge tank 2 Main part 2a Joining seat 2b Opening 3 Dividing part 3a Joining seat 4 Branch pipe 5 Cylinder head mounting flange 8 Bolt hole 12 Sheet material with flux 13 Aluminum bolt 14 Cover 14a Bolt hole 15 Aluminum bolt

Claims (2)

[Claims] 1. A surge tank is divided into a main body part and a divided part, and a joining portion of the two is joined in a furnace after a flux-containing sheet-shaped brazing material is sandwiched and temporarily fixed with aluminum bolts. A junction structure of a surge tank in an intake manifold, characterized in that: 2. A surge tank comprising a main body and a splittable lid, and a joining portion of the two is temporarily fixed with aluminum bolts with a flux-containing sheet-shaped brazing material sandwiched therebetween and then joined in a furnace. A junction structure of a surge tank in an intake manifold, characterized in that: