US 6,415,765 B1Granted

Throttle unit of engine

AssigneeHonda Giken Kogyo Kabushiki Kaisha

InventorsTakashi Akagi, Takashi Udono

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Abstract

A bypass passage includes an inlet in communication with the upstream sides of first and second throttle valves of first and second suction passages. One valve body receiving chamber is coaxial with the inlet. First and second upstream side branch passages extend from the valve body receiving chamber. Downstream side branch passages extend from the end portions of the upstream side branch passages and are in communication with the downstream sides of the first and second throttle valves of the first and second suction passages. One bypass valve is movably received in the valve body receiving chamber and can open the first and second upstream side branch passages to be at the same opening. Reducing the number of bypass valves to one can reduce the manufacturing costs and the number of man hours for assembly of the throttle unit and can equalize the rate of air flowing through the respective bypass passages.

Claims16

Dependent claims

A throttle unit for a multiple-cylinder engine, comprising:

a plurality of suction passages, said plurality of suction passages being extendable from an air cleaner to respective combustion chambers of the multiple-cylinder engine;
a plurality of throttle valves, each of said plurality of throttle valves being disposed in said plurality of suction passages, respectively;
and
a bypass passage for bypassing said plurality of throttle valves, said bypass passage comprising:
an inlet, said inlet being in communication with an upstream side of said plurality of throttle valves;
a valve body receiving chamber, said valve body receiving chamber being coaxial with said inlet;
a plurality of upstream side branch passages, each of said plurality of upstream side branch passages extending from said valve body receiving chamber;
a plurality of downstream side branch passages, each of said downstream side branch passages extending from end portions of said plurality of upstream side branch passages, respectively, each of said downstream side branch passages being in communication with a downstream side of said plurality of throttle valves;
and
a valve body movably received in said valve body receiving chamber for opening and closing said bypass passage, said valve body being movable in a direction away from said inlet to open said plurality of upstream side branch passages at the same opening quantity when said bypass passage is in an open condition.

7 more elements

A bypass passage for a throttle unit of a multiple-cylinder engine, said throttle unit including a plurality of suction passages extending from an air cleaner to respective combustion chambers of the multiple-cylinder engine and a plurality of throttle valves disposed in the plurality of suction passages, respectively, said bypass passage for bypassing the plurality of throttle valves and comprising:

an inlet, said inlet for being in communication with an upstream side of the plurality of throttle valves;
a valve body receiving chamber, said valve body receiving chamber being coaxial with said inlet;
a plurality of upstream side branch passages, each of said plurality of upstream side branch passages extending from said valve body receiving chamber;
a plurality of downstream side branch passages, each of said downstream side branch passages extending from end portions of said plurality of upstream side branch passages, respectively, each of said downstream side branch passages for being in communication with a downstream side of the plurality of throttle valves;
and
a valve body movably received in said valve body receiving chamber for opening and closing said bypass passage, said valve body being movable in a direction away from said inlet to open said plurality of upstream side branch passages at the same opening quantity when said bypass passage is in an open condition.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 09/949,801Filed 12 Sep 2001
Priority: JP 2000-27719112 Sep 2000
Published: US 2002/0029759 A114 Mar 2002
Granted: 9 Jul 2002
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

F02D 9/1095
Having two or more flaps: rotating on a common axis, e.g. having a common shaft
F02B 61/02
Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing: for driving cycles
F02M 3/14
Other details of idling devices: location of idling system outlet relative to throttle valve
F02B 75/22
Multi-cylinder engines: with cylinders in V, fan, or star arrangement