Sango Co., Ltd.

Toyota Jidosha Kabushiki Kaisha

Toyota Jidosha Kogyo Kabushiki Kaisha

The Toyo Rubber Industry Co., Ltd.

Osamu Kuroda

Motoo Kunihiro

Masahiro Ishigaki

Masashi Ota

Zenji Nakajima

Tomiaki Atsumi

Tamio Nakakubo

Shuichi Okamoto

Masayoshi Tange

Kazumasa Kuze

Sadao Kajiya

Satoshi Itoh

A single valve member is provided for selecting communication of one of two flow passages constituting an exhaust flow passage, and continuously providing a flow passage area of the selected one of the two flow passages. According to this valve member, a changeover of flow passage between a main flow passage with an exhaust processing device disposed therein and a bypass flow passage is performed, and each flow passage area is regulated, to meet an output requirement, exhaust processing requirement and muffling requirement, appropriately. For example, a single valve memberis disposed on the upstream side or downstream side of a start catalytic converter, whereby communication of one of a main flow passageand a bypass flow passageis selected, and a flow passage area of the selected passage is continuously provided.

Exhaust apparatus of an internal combustion engine

According to evaluation of tone quality of exhaust sound adapted to human audition, a characteristic of the tone quality of exhaust sound is objectively analyzed. There are provided a measuring process (M) for sampling exhaust sound to be analyzed, by means of a microphone disposed in an exhaust system EX and converting the exhaust sound into an electric signal, an analyzing process (M) for amplifying a high frequency component of the electric signal and performing a frequency analysis of the electric signal at an arbitrary time interval, a detecting process (M) for detecting a first formant of the first peak from the low frequency side and a second formant of the second peak from the low frequency side, and a displaying process (M) for displaying a relationship (brightness and sharpness) between the first formant and second formant in a predetermined time range.

Method for analyzing tone quality of exhaust sound

A fluid-damping vibration-isolating support device comprising a main support body having a rubber base member and a closed enclosure internally thereof; and a partition plate dividing the enclosure into two chambers which intercommunicate through an orifice and are filled with a liquid. The partition plate comprises a separator member and a stopper member. The separator member is formed of an outer peripheral thick wall portion having an orifice and an inner thin flat plate portion having at least one through-hole. The stopper member has two opposed plate sections provided so as to cover the through-hole and is captured to the separator member slightly movably to the degree that the plate sections are in contact with or separate from both faces of the flat plate portion. The stopper member serves to close upon low frequency vibration and open upon high frequency vibration, so that in the high frequency region rise of hydraulic pressure can be suppressed and dynamic spring rate can be lowered.

Fluid-damping vibration-isolating support device

A muffler for automobiles having a drum-shaped expansion chamber of diameter D and length h, to which gas inlet and outlet pipes and an insert pipe of a Helmholtz resonator open so that the gas flow traverses the expansion chamber substantially diametrically therethrough, wherein the ratio h/D is substantially 0.25 - 0.4.

Muffler for automobiles

Growing community of inventors

Toyota, Japan

Osamu Kuroda