JPS6229658Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the material and configuration of a fuel distribution pipe of a fuel injection device for an internal combustion engine.

Conventionally, fuel distribution pipes for internal combustion engines with electronically controlled fuel injection devices have been made of metal materials such as aluminum die-casting and pipe materials, and the heat from the engine is transferred and the heating material is not vaporized inside the distribution pipe. As a result, there was a problem that the injection efficiency decreased. Furthermore, it has been difficult to reduce the price due to the materials, manufacturing method, etc. (For example, Japanese Patent Publication No. 55
-5429, published in Utility Model Application Publication No. 55-90743. ) In view of the above-mentioned problems, the present invention constructs a distribution pipe by molding a composite material made of a resin material mixed with a reinforcing material such as glass fiber or an inorganic filler. This aims to solve the above-mentioned problems by orienting the reinforcing material such as glass fiber or inorganic filler in the axial direction to increase the strength.

An embodiment of the present invention will be described below based on the drawings.

In FIG. 1, 1 indicates a fuel distribution pipe. Fuel pumped under pressure by a fuel pump (not shown) is introduced into the main body from the inlet 3 and distributed from each outlet 41, 42, 43, 44 communicating with each injection valve provided for each cylinder of the engine intake manifold (not shown). supply The main body 1 is made of glass fiber-filled nylon, and the axial direction of the glass fibers 2 is aligned with the axial direction of the distribution pipe, as shown at 2 in the longitudinal cross-sectional view of FIG. The main body is formed by injection molding, and the injection molding inlet is located in the axial direction 13 at one end of the distribution pipe.
(or 14). Near the injection port, the glass fibers are arranged circumferentially, but at a distance, they are arranged axially. The inlet is located in the radial direction 11 (or 12) at one end of the distribution pipe.
Even if it is located in

The coefficient of thermal expansion of the glass fiber-containing composite material is:
The direction in which the glass fibers are oriented is almost the same as that of aluminum, but the direction perpendicular to the orientation of the glass fibers is three times larger than that of aluminum. Therefore, injection molding is performed through the injection port as described above, and the glass fibers are oriented in the axial direction. Further, the thermal conductivity of the composite material is about 1/100 of that of metal materials, so it has a remarkable effect of insulating heat from the engine and suppressing the rise in fuel temperature. Therefore, the main purpose of the main body 1, which is made of synthetic resin, is to prevent engine heat from being transferred to the fuel and vaporizing it in the distribution pipe. However, the linear expansion coefficient of synthetic resin is approximately three times larger than that of aluminum, which is the material of the engine intake manifold to which the distribution pipe is attached. When two parts with different coefficients of linear expansion are assembled in this way, so-called thermal stress occurs due to the difference in expansion, which can lead to defects that can lead to deformation or even destruction of the parts, or to poor airtightness with the fuel injector due to deformation. Problems may occur.

In the present invention, the axial direction of the glass fiber 2 is made to coincide with the axial direction of the distribution tube, so that no difference in linear expansion coefficient occurs. The glass fiber content is usually around 30%. In addition, when injection molding a distribution pipe, the effect of the present invention can be exerted even if the injection port is located in the radial direction 11 (or 12) of one end of the distribution pipe. The effect is limited to a quarter of the way from the pipe end, and the closer it is to the pipe end, the greater the effect.

Furthermore, the reinforcing material is not limited to glass fiber, but other materials such as carbon fiber and fisker may also be used.

As mentioned above, the present invention is made by molding a composite material in which reinforcing fiber material is mixed with synthetic resin.
Since the longitudinal direction of the reinforcing fibers is oriented along the axial direction of the tube, it has extremely excellent effects in that it can reduce thermal expansion in the axial direction and also provide heat insulation properties.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an embodiment of the present invention, and FIG. 2 is a longitudinal sectional view of the distribution pipe shown in FIG. 1...Fuel distribution pipe, 2...Glass fiber, 3...
Fuel inlet, 21... damper, 22... pressure control valve, 41, 42, 43, 44... fuel injection valve mounting port.

Claims (1)

[Scope of utility model registration request] In a fuel distribution pipe having a pressurized fuel inlet and a plurality of outlets communicating with fuel injection valves, the pipe body constituting the fuel distribution pipe is made of a composite material in which reinforced fiber material is mixed with synthetic resin. 1. A fuel distribution pipe for an internal combustion engine, characterized in that the reinforcing fibers are molded as a pipe, and the longitudinal direction of the reinforcing fibers is oriented along the axial direction of the pipe.