JPS5934469A - Piston for carburetor - Google Patents

Abstract

PURPOSE:To heighten the resistance of a piston to chemicals and wear and its water repellency and dimensional stability and reduce its weight and cost, by making the inner element of the piston from a hard material such as metal and ceramic, molding its outer element from thermosetting or thermoplastic resin and using a process of calking, screwing, bonding or the like to attach an accessory element such as a diaphragm to the inner element. CONSTITUTION:An inner element 1 is made of such a material of resistance to heat and chemicals and high strength as metal including zinc, aluminum, brass, stainless steel, etc. and ceramic. An outer element 2 is made of plastic so that it is integrally molded with the inner element 1. It is preferable that the plastic is such thermosetting or thermoplastic resin of resistance to wear and chemicals and good water repellency as phenol resin, melamine resin, polyimide resin, polyacetal resin, polyamide resin and polyphenylene sulfide resin. A piston body is thus made of the inner and the outer elements 1, 2. An accessory element such as a diaphragm 3 is thereafter attached to the outside 1a of the inner element 1 by calking, screwing, bonding or the like.

Description

[Detailed Description of the Invention] Currently, carburetor pistons are made of metal materials such as stainless steel and aluminum, and by surface treatment,
It has improved durability such as water resistance, oil resistance, and abrasion resistance. The use of plastic for such pistons is being considered in order to reduce weight and cost, but the outer surface is made of a plastic material that has little dimensional change due to water absorption and has good chemical resistance, abrasion resistance, and water repellency. It is necessary to.

On the other hand, the inner surface of the piston must be made of a material with excellent mechanical strength and chemical resistance. Therefore, the inner body that makes up the inside of the piston is formed from a hard material such as metal or ceramic, and the outer body that makes up the outside of the piston is made of thermosetting resin or thermoplastic resin and is integrally formed with the inner body using a plastic molding method. Chemical resistance, abrasion resistance, water repellency, dimensional stability, etc. are achieved by manufacturing a vaporizer piston by attaching accessory parts such as a diaphragm to the inner body by caulking, screwing, gluing, etc. It has been found that the present invention is excellent, and also achieves weight reduction and cost reduction.

The present invention will be explained with reference to the drawings.

FIG. 1 is a perspective view of the piston body of the present invention, and FIG. 2 is a partial side sectional view of FIG. 1. FIG. 3 is a partial side sectional view of the piston with attached diagram. In the figure, the interior body 1 is made of metal or ceramic and has a shape to which accessory parts such as a diaphragm can be attached by caulking, screwing, gluing, etc. The exterior body 2 is made of thermosetting resin or thermoplastic resin, and is integrally formed with the interior body 1 by a plastic molding method. Materials for the interior body include metals such as zinc, aluminum, brass, and stainless steel, as well as ceramics and heat-resistant materials.
Uses chemical-resistant, high-strength materials.

The outer surface of the inner body may be knurled, grooved, surface roughened, or coated with an adhesive to improve adhesion to the outer body.

The resin used for the exterior body 2 is preferably a thermosetting resin or thermoplastic resin with good wear resistance, chemical resistance, and water repellency, such as phenol resin, melamine resin, polyimide resin, polyacetal resin, polyamide resin, and polyphenylene sulfide resin. It is.

After manufacturing the piston body consisting of the inner body and the outer body formed integrally with the inner body, attaching accessories such as the diaphragm 3 to the outside 1a of the inner body where the outer body is not covered,
Attach by screwing, gluing, or other methods to complete the carburetor piston.

The carburetor piston of the present invention has the following excellent features.

(1) Lighter than a metal piston.

(11) The exterior body can be made thinner, and since it is formed by a plastic molding method, the dimensional accuracy is also very good.

Accessory parts such as the GID diaphragm can be easily attached by caulking, screwing, gluing, etc.

4ψ Since the piston of the present invention does not require much dimensional accuracy of the inner body, and the outer body is formed by a plastic molding method, it can be mass-produced at low cost.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a piston body for a carburetor according to the present invention. FIG. 2 is a partially sectional side view of FIG. 1. FIG. 3 is a partially sectional side view of a carburetor piston with a diaphragm attached. (1) Interior body (2) Exterior body Patent applicant Sumitomo Bakelite Co., Ltd. Mikuni Industries Co., Ltd.

Claims (1)

[Claims] Attachments such as a diaphragm are attached to the piston body, which consists of a thin cylindrical inner body made of a hard material such as metal or ceramic, and an outer body made of plastic integrally formed with the inner body, and attached parts such as a diaphragm are crimped, glued or screwed. A carburetor piston mounted on a stop.