Abstract: A fluid cylinder with a swivel joint which is more improved with high utility is provided. To this end, in the fluid cylinder, a flow passage (R2b) leading to a chamber (1F) at the rod side of the cylinder is provided inside a rod (3), and a pin hole (3H) in a rod front end portion (3F) and a pin (P1) fitted in the pin hole (3H) are formed into a swivel joint so that the flow passage (R2b) is always guided to an outside even if the pin hole (3H) and the pin (P1) are relatively rotated.

Abstract: A vertical lift type arm device includes a set of left and right control links each having three connection shaft holes, a set of left and right central mounting parts which are provided at a center part of the main frame, and a set of left and right mounting parts which are provided at rear parts of the lift arms and extend downward. Front end parts of the control links and the central mounting parts are pivotably attached to each other, center parts of the control links and lower end parts of the mounting parts are pivotably attached to each other, and connection axes of the control links and the central mounting parts are provided at a same height as or at a higher position than connection axes of lower end parts of the rear links and the main frame.

Abstract: A piston valve type layered scavenging 2-cycle engine has a reduced engine height, is light and compact, and achieves an exhaust gas purification. An upper edge of a pilot air port provided in an inner wall of a cylinder is positioned at substantially the same height as that of an upper edge of an intake port. An extended portion extended to a lower side rather than a piston lower edge at a position opposing to the intake port is provided in a lower end portion at a position opposing to the pilot air port in the piston. An interval between the right and left extended portions is set to be larger than an outer width of a balance weight of a crank shaft. A piston groove which connects the pilot air port to the scavenging port at a time of an intake stroke is provided on an outer peripheral surface of the extended portion. A second scavenging flow passage having a simple structure is provided in a lower side of a first scavenging flow passage.

Abstract: A stratified scavenging two-cycle engine with catalyst capable of meeting such a requirement that a THC exhaust rate is 54 [g/kW·h] or less with use of catalyst. For this purpose, in the stratified scavenging two-cycle engine in which an air feed volume ratio R of an air feed volume (qa) flowing through the air feed passage (24) to a mixture feed volume (Qf) flowing through the mixture feed passage (20) is within a range of 0.7≦R≦1.4 during an intake stroke in which the crank chamber (8) becomes negative pressure, oxidation catalyst (47) is placed midway in an exhaust passage in a downstream of an exhaust hole (14).

Abstract: The engine can improve a leading air suction efficiency, has a simple structure and a low cost. Accordingly, in a stratified scavenging two-stroke cycle engine provided with an exhaust port (22) and a scavenging port (21) which are connected to a cylinder chamber (10), a leading air suction port (24) not connected to the cylinder chamber and a crank chamber (11), an air-fuel mixture suction port (23) connected to the crank chamber, a scavenging flow passage (20) connecting between the scavenging port and the crank chamber, and a piston groove (25) connecting between the leading air suction port and the scavenging port and not connecting between the air-fuel mixture suction port and the scavenging port at a time of a suction stroke, and disposed in an outer peripheral portion of the piston (4), the leading air suction port is positioned at an opposite side to the air-fuel mixture suction port with respect to an axis of the cylinder (3).

Abstract: A fuel tank for an engine capable of preventing the temperature of the fuel tank from rising and grass from entering a cooling fan, and being low in production cost with a simple structure is provided. To this end, in the fuel tank for an engine installed on a crankcase (2) of an engine (1) and having a face opposing a muffler (7), a heat insulating part (22) integrally formed is provided on the face opposing the muffler (7). Further, a stand part (25) integrally formed is provided.

Abstract: A stratified scavenging two-cycle engine, whose simple configuration can satisfy the regulation of emission rate of THC in exhaust gas, includes: a cylinder block (4), housing a piston (1) so as to be vertically slidable and having an exhaust port (14) and a scavenging port (16) in a sidewall; a scavenging flow passage (22), for connection between a crank chamber (8) and the scavenging port (16); an air supply flow passage (24), connected to the scavenging flow passage (22) and supplying air through a check valve (26); and a mixture supply flow passage (20), for supplying mixture to the crank chamber (8). The supply quantity ratio R=qa/Qf, which is the ratio of a supply quantity qa of air flowing through the air supply flow passage (24) to a supply quantity Qf of mixture flowing through the mixture supply flow passage (20) during a suction stroke in which pressure in the crank chamber (8) is negative, is in the range of 0.7≦R≦1.4.

Abstract: A stratified scavenging two-cycle engine is capable of doing away with emission of a mixture into the atmosphere and of reducing intake resistance of air. For this purpose, an air intake port (11) is provided at a position which is a predetermined distance away from scavenging ports (51) toward a crank chamber (20) parallel to the axial direction of the cylinder block (1), and the scavenging ports (51) are connected to the air intake port (11) through a piston (3) to thereby supply air to scavenging flow passages (50) from the air intake port (11) through the scavenging ports (51) at the time of an intake stroke.

Abstract: The present invention is a stratified scavenging two-cycle engine which can make exhaust gas cleaner. For this purpose, in a stratified scavenging two-cycle engine, which includes a scavenging flow passage (3) to connect a cylinder chamber (4a) and a crank chamber (1a) and an air flow passage (2) connected to the scavenging flow passage (3), is constructed so that pressure reduction in a crank chamber (1a) following an upward movement of a piston (7) permits air to be drawn into the scavenging flow passage (3) from the air flow passage (2) and a scavenging port (3a), at which the scavenging flow passage (3) is opened to a cylinder inner surface (4b), is not fully obstructed by a side wall of the piston (7) and communicates with the crank chamber (1a).

Abstract: The present invention relates to a stratified scavenging two-cycle engine, in which control of an air flow rate provides favorable acceleration performance and can prevent deterioration of exhaust gas. The stratified scavenging two-cycle engine includes a scavenging flow passage (3) for connection between a cylinder chamber (4a) and a crank chamber (1a), an air flow passage (2) connected to the scavenging flow passage (3), an air flow rate control means (12) for controlling a flow rate of air fed to the scavenging flow passage (3) from the air flow passage (2), and a fuel mixture flow rate controller (11) for controlling a flow rate of a fuel mixture drawn into the crank chamber (1a) from a fuel mixture flow passage (10). The air flow rate controller (12) throttles an air flow rate at the time of acceleration. Alternatively, the air flow rate controller (12) is opened later than the mixture flow rate controller (11) at the time of acceleration.

Abstract: A stratified scavenging two-cycle engine, having excellent scavenging performance and a simple structure which can be manufactured at low cost, includes a cast cylinder block (2, 2a) containing a cylinder chamber (9) and two scavenging ports (14, 14, 14a, 14a), which are provided in opposite portions of the interior wall surface of the cylinder chamber (9). Each scavenging port (14, 14a) and the crank chamber (7) are connected via a scavenging flow passage (20) which includes a generally horizontally extending scavenging flow passage segment (22, 22a) and a generally vertically extending scavenging flow passage segment (21). Two recesses (23, 23, 23a, 23a) are provided in the outer surface of the cylinder block (2, 2a) with each recess being an outwardly directed extension of a respective horizontally extending scavenging flow passage segment. An air supply flow passage member (30, 30a) is attached to the cylinder block to cover a respective recess.

Abstract: A stratified scavenging two-cycle engine, which enables a reduction in size and an improvement in productivity, includes a carburetor (6), which is provided between an air cleaner (7) and a suction fitting (4), wherein a mixture flow passage (6B) and an air flow passage (6A) are formed in the carburetor at least generally in parallel with each other, an air control valve (6a) is disposed in the air flow passage in the carburetor, and a mixture control valve (6b) is disposed in the mixture flow passage in the carburetor so that the carburetor and the valves (6a and 6b) constitute a single unit.

Abstract: The present invention is a stratified scavenging two-cycle engine which has a more compact structure. The stratified scavenging two-cycle engine includes a scavenging flow passage (3) for connection between a cylinder chamber (4a) and a crank chamber (1a); and an air flow passage (2) connected to the scavenging flow passage (3), the scavenging flow passage (3) is continuously formed by a communication portion (30) extending from the crank chamber (1a) toward the cylinder chamber (4a) side; and a scavenging direction adjustment portion (31) extends from the communication portion (30) toward a cylinder inner surface (4b) side and opens at a scavenging port (3a) in the cylinder inner surface (4b). The air flow passage (2) extends into an area surrounded by the communication portion (30), the scavenging direction adjustment portion (31), and the cylinder inner surface (4b).

Abstract: An air inlet system of an engine includes a fan having a plurality of vanes in a radial arrangement for blowing air from a center of rotation of the fan towards a radially outward area. A fan case covers the fan and has an airflow supply opening formed in the vicinity of the center of rotation of the fan and an airflow path formed at the outer periphery of the fan to direct an airflow for cooling said engine. A communication path has an air intake formed in the vicinity of the airflow supply opening in the fan case and directs the introduced air to a carburetor of the engine.

Abstract: To mow even soft grass more tidily in shearing mode without kicking pebbles, a pair of two grass cutting wheels are pivotally driven by an engine in two mutually-different directions. One cutting wheel is slidably fixed relative to the other cutting wheel for safety. The mowing machine can be used in common to shear off grass on the ground and trim a garden tree by adjusting an angle between a hollow grip pipe and the machine cutting surface.

Abstract: To mow even soft grass more tidily in shearing mode without kicking pebbles, a pair of two grass cutting wheels are pivotally driven by an engine in two mutually-different directions. One cutting wheel is slidably fixed relative to the other cutting wheel for safety. The mowing machine can be used in common to shear off grass on the ground and trim a garden tree by adjusting an angle between a hollow grip pipe and the machine cutting surface.