JPS60119360A - Intake menifold of engine - Google Patents

Abstract

PURPOSE:To improve the dimensional accuracy and to strengthen the mechanical jointing force, by projecting a filler section integrally from the joint of members split cast through voidless diecast for constructing an intake manifold of an engine then performing TIG welding. CONSTITUTION:An intake manifold for a 4-cylinder engine is assembled with two split cast members 1a, 1b cast from aluminum alloy through voidless diecast. Filler sections 3a, 3b are projected integrally from the joints 2 of said members 1a, 1b. The joint sections 2 are butted each other to weld the filler sections 3a, 3b through TIG welding thus provide reinforcement of weld.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an intake manifold for an engine, and more particularly to an intake manifold for an engine that is formed by combining and integrating parts that are separately die-cast using an aluminum alloy.

Engine intake manifolds are normally manufactured by gravity casting using a sand mold or metal mold using a core, but recently there has been an attempt to integrate them by combining parts that are separately cast by aluminum die casting. For integration, welding is the most reliable and preferred method, but die-cast parts contain gas sealed inside, so welding will cause the gas to blow out. It was considered difficult or impossible to weld.

The present invention involves separately casting each member constituting an engine intake manifold using a nonporous die-casting method, forming a protruding filler portion at the joint portion of each member, and forming the joint portion with filler material. Engine intake manifolds that are welded using the TIG welding method, which does not use welding, have high dimensional accuracy, a good appearance of the welded parts, strong mechanical bonding force, and can be produced efficiently. We aim to provide the following.

Hereinafter, an example of implementing the present invention will be described based on the drawings.

Fig. 1 shows an intake manifold for a four-cylinder engine according to the present invention, and the member (la) is cast in two parts as shown in Fig. 2.
(lb) are combined, and the joint parts (2) are welded together using the TIG welding method without using filler metal.

Components (1a) (1b) constituting the engine intake manifold
is cast by a non-porous die casting method using, for example, an aluminum alloy specified in JIS H5302.

The nonporous die casting method mentioned here includes vacuum die casting method, oxygen substitution die casting method, atmosphere flow die casting method, etc.
A die-casting method in which the amount of gas involved in the cast product is extremely small.

The members (la) and (lb) are formed with weld portions (3a) and (3b) projecting from the joint portions (2) of the members (la) and (lb), respectively.

The filler part (3a> (3b) is formed into the same body when parts (la) and (lb) are die-cast, and naturally has the same composition as parts (Ia) and (Ib). The filler portions (3a) and (3b) are melted into each other during welding to form a surplus portion (4).

Therefore, by combining the two members (la) and (Ib) and butting the joint parts (2) against each other, the joint parts (2)
are welded by the TIG welding method without using filler metal to obtain a completed engine intake manifold.

That is, in the normal TIG welding method, a filler metal (rod) is used to fill the joint part between members and to form a surplus part, but in the present invention, the joint part (2 )
By forming the filler parts (4a) and (4b) protruding from the same body, the use of a filler material (rod) is obviated.

Since the intake manifold for an engine of the present invention is constructed in this manner, it is possible to efficiently produce a manifold with higher dimensional accuracy and excellent casting surface than those made by conventional methods.

Moreover, there is no wavy pattern peculiar to TIG welding, the appearance of the welded part is good, and the condition of the welded part is very healthy.

Furthermore, since no filler metal (rod) is used, the cost is reduced, and the welding speed is two to three times faster than the conventional method, improving productivity.

Therefore, the intended purpose can be achieved.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing an example of the implementation of the present invention, Fig. 2 is a perspective view of a member cast in two parts, and Fig. 3 is (X) in Fig. 1.
-(X) line enlarged cross-sectional view shows the state before welding, and FIG. 4 shows the same cross-sectional view after welding. In the figure, (la) and (lb) are member (2) the joint part, (
3a) (3b) is the filler part. Patent applicant: Fuso Light Alloy Co., Ltd. Figure 3 Figure 4

Claims (1)

[Claims] In an engine intake manifold constructed by combining parts cast separately using a non-porous die-casting method, a filler part is formed protruding from the joint part of each part in the same body, and the joint part does not use filler material. Engine intake manifolds welded using the TIG welding method.