Suzuki Motor Corporation

Suzuki Jidosha Kogyo Kabushiki Kaisha

Yutaka Sasaki

Yasuaki Yatagai

Hitoshi Matsumura

Hideshi Morii

Ken Shibano

Susumu Okubo

In a snowmobile, a four-cycle engine is mounted in such a manner that its crankshaft is arranged along the body width direction and the central axis of a cylinder(s) is tilted rearward by angle &#x3b1; with respect to the vertical direction of the body, forming a rear tilted engine. At least part of the engine intake system including an air cleaner box and throttle body, connected to the intake port(s) of the engine is accommodated in the space inside the topmost projected portion of the engine hood. Exhaust is led out to the muffler located in front of the cylinder(s) by the exhaust system connected to the exhaust port(s) at the front of the cylinder head. Further, the intake passage is arranged between the engine body and the steering post.

Snowmobile equipped with a four-cycle engine and intake structure for snowmobile engines

In a snowmobile, a four-cycle engine has an alternator as a generator while the snowmobile body has heat exchangers through which the cooling water of the engine is cooled by heat exchange with external air and snow, in a front part and at the ceiling of a crawler house. The alternator is positioned between the four-cycle engine and the front heat exchanger. Further, an exhaust manifold is arranged at an upper position in front of the engine body while an approximately cylindrical oil filter is provided under the exhaust manifold and inclined forwards in the vehicle's direction of travel.

Arrangement and structure of auxiliaries in a snowmobile engine

In a snowmobile, a four-cycle engine is mounted in such a manner that its crankshaft is arranged along the body width direction and the central axis of a cylinder(s) is tilted rearward by angle &agr; with respect to the vertical direction of the body, forming a rear tilted engine. At least part of the engine intake system including an air cleaner box and throttle body, connected to the intake port(s) of the engine is accommodated in the space inside the topmost projected portion of the engine hood. Exhaust is led out to the muffler located in front of the cylinder(s) by the exhaust system connected to the exhaust port(s) at the front of the cylinder head. Further, the intake passage is arranged between the engine body and the steering post.

In a cooling arrangement for a water-cooled snowmobile engine, a water pump is disposed on the front side of the cylinder head, under the exhaust manifold and is coupled to a crankshaft so that it is driven by the rotational force which is transmitted through a drive belt from a drive pulley fitted on the crankshaft end. A cooling water inlet port for leading cooling water into the interior of the engine is provided on the front side of the cylinder block and under the exhaust manifold while a cooling water outlet port through which cooling water is taken out from the interior of the engine is arranged on the cylinder head's side face at a position over and opposite to the drive belt and a thermostat is arranged at the cooling water outlet port.

Cooling arrangement for a snowmobile engine

A jet propulsion craft propelled upon a water surface generally comprises a hull structure comprising a bottom plate and an upper plate, an engine mounted upon the bottom plate at substantially a middle portion of the hull structure as considered in the longitudinal direction thereof, the engine being provided with an exhaust port, an exhaust system extending rearwardly from the engine and provided with an inlet end and an outlet end, the inlet end being operatively connected to the engine exhaust gas discharging port, and a jet pump mounted upon the bottom plate at a rear portion of the hull structure and driven by means of the engine. An exhaust gas noise eliminating device operatively connected to the outlet end of the exhaust system is further provided for the craft for eliminating the exhaust gas noise in a stepwise manner. The exhaust gas noise eliminating device comprises a hollow guard plate mounted upon the bottom plate at the rear portion of the hull structure and the inner hollow portion thereof is divided into a plurality of expansion chambers. The exhaust gas noise eliminating device may also comprise a box like member mounted upon a rear end portion of the hull structure and the inner hollow portion thereof may be divided into a plurality of expansion chambers.

Growing community of inventors

Hamamatsu, Japan

Yutaka Sasaki