JPS608456U - intake manifold - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of drawings]

Fig. 1 is a plan view of an intake manifold with a balance tube of a fixed venturi type multiple carburetor as a prior art, and Fig. 2 is an engine rotational speed in the intake manifold with a balance tube of a multiple carburetor of Fig. 1. Figure 3 shows a cross-sectional view when all intake ports are connected through balance tubes, and Figure 4 shows a comparison between when a balance tube is installed and when it is not installed. A characteristic diagram of engine speed and torque; FIG. 5 is a plan view of an intake manifold of the type previously proposed by the applicant in which intake ports are connected through a balance tube; FIG. 6 is a first embodiment of the present invention. 7 is a cross-sectional view of the intake manifold shown in FIG. 6 and its vicinity, and FIG. 8 shows the engine rotation speed of the engine intake system with the intake manifold shown in FIG. 6 installed, and the engine speed of each carburetor. FIG. 9 is a diagram showing the characteristics of intake air flow rate and FIG. 9 is a plan view showing a part of the intake manifold in cross section according to the second embodiment of the present invention. 21... Intake manifold (whole), 22. 2
3...Intake manifold connected to each carburetor (
part), 24.25... Carburizer, 26.27.
...Riser section, 28.29...Collection section,
30.31...branch, 32. 33. 34
．． 35... Branch port, 36... Cylinder head, 37... Cylinder head intake port, 38... Throttle valve, 39...
...Venturi section, 41...Suction piston, 44...Vent, 46...Performance tube, 47...Another balance tube , 48.49... Orifice. Figure 2 Figure 3

Claims (2)

[Scope of utility model registration request] (1) In the intake manifold of a multi-cylinder engine connected to a variable venturi type multiple carburetor, one of the multiple branch ports connected to each carburetor is connected to each other using a balance tube. At the same time, the riser portion of the intake eyebrow hold connected to each carburetor is communicated with another balance tube, and the passage cross-sectional area of the balance tube that communicates with the branch port is communicated with the riser portion. An intake manifold characterized by having a passage cross-sectional area smaller than that of a balance tube. (2) Intake manifold for a 4-cylinder engine connected to a downdraft variable bench lily type twin carburetor? At the same time, the branch port valve connected to #2 cylinder and the branch port connected to cylinder #3 are communicated with each other by a balance tube, and the riser part of the intake manifold connected to each carburetor is connected to another balance tube. 2. The intake manifold according to claim 1, wherein the passage cross-sectional area of the balance tube that communicates with the branch port is smaller than the passage cross-sectional area of the balance tube that communicates with the riser part.