Abstract: A bicycle operating device comprises a base member made of a resin material. The base member includes an outer surface, a cylinder bore, and at least one recess provided on the outer surface to define a cylinder wall between the cylinder bore and the at least one recess. The cylinder wall has a cylinder-wall thickness defined between the cylinder bore and the at least one recess. The cylinder-wall thickness is equal to or larger than 1 mm and equal to or smaller than 3.5 mm.

Abstract: A bicycle operating device comprises a base member, an operating member, a piston, and an electrical switch. The base member includes a first end portion to be mounted to a bicycle handlebar, a second end portion opposite to the first end portion, and a cylinder bore. The operating member includes a proximal end portion and a distal end portion. The proximal end portion is pivotally coupled to the base member about a pivot axis. The distal end portion is farther from the proximal end portion than the pivot axis. The piston is movably provided in the cylinder bore and operatively coupled to the operating member to move in the cylinder bore in response to a pivotal movement of the operating member. The electrical switch is provided at the second end portion. The electrical switch is farther from the distal end portion of the operating member than the pivot axis.

Abstract: A bicycle operating device comprises a base member, an operating member, and a piston. The base member has a longitudinal axis defined along a center axis of a free end of a bicycle handlebar in a mounting state where the base member is mounted to the free end of the bicycle handlebar. The base member includes a cylinder bore having a cylinder center axis. The cylinder bore is at least partly arranged in the bicycle handlebar in the mounting state. The operating member is pivotally coupled to the base member about a pivot axis. The cylinder center axis is inclined relative to the longitudinal axis by an inclination angle equal to or larger than 4 degrees. The piston is movably provided in the cylinder bore and operatively coupled to the operating member to move in the cylinder bore in response to a pivotal movement of the operating member.

Abstract: A bicycle component mounting device comprises a base member, a holding member, a movable member, and a guide structure. The base member includes a mounting portion. The holding member is movably mounted to the mounting portion. The movable member is movably mounted relative to the base member to push the holding member relative to the mounting portion. The guide structure is configured to guide the holding member relative to the mounting portion in a guide direction inclined relative to a longitudinal axis in response to a movement of the movable member. The guide structure includes a recess and a protrusion. The recess is provided at one of the mounting portion and the holding member. The protrusion is configured to be disposed in the recess and provided at the other of the mounting portion and the holding member.

Abstract: A bicycle hydraulic device includes a cylinder including a cylinder bore, a piston located in the cylinder bore and movable between an initial position and an actuation position, a reservoir tank that is in fluidal communication with the cylinder bore through a communication port, and a flow modulator configured to modulate a flow behavior of a fluid in accordance with a direction in which the fluid flows in the communication port.

Abstract: A bicycle hydraulic operating device basically has a base member, an operating member, a piston and a connecting rod. The base member includes a cylinder bore and a reservoir tank. The operating member is pivotally mounted to the base member to pivot about a pivot axis. The piston is movably disposed in the cylinder bore of the base member along a cylinder axis of the cylinder bore. The connecting rod operatively couples the operating member to the piston. The reservoir tank is arranged to overlap the connecting rod as viewed in a direction parallel to the pivot axis of the operating member. The reservoir tank is arranged to at least partly offset from the cylinder bore in a direction parallel to the cylinder axis.

Abstract: A bicycle hydraulic operating device is basically provided with a first base part, a second base part and a piston. The first base part includes a cylinder bore, a first end surface having a first opening, and a first passage extending from the first opening in the first end surface to the cylinder bore. The second base part includes a reservoir tank, a second end surface having a second opening, and a second passage extending from the second opening in the second end surface to the reservoir tank. The first end surface faces the second end surface. The first and second passages are fluidly connected via the first and second openings. The piston is movably disposed in the cylinder bore of the first base part.

Abstract: An operating member is movably coupled to a base member. A hydraulic unit comprises a cylinder bore and a piston movably provided in the cylinder bore. The piston is coupled to the operating member to generate a hydraulic pressure in response to a movement of the operating member relative to the base member. A reservoir tank comprises a lid opening having a maximum width and a reservoir bore extending from the lid opening and having a maximum depth. The maximum depth is larger than the maximum width. The reservoir bore is connected to the cylinder bore and disposed above the cylinder bore in a mounting state where the bicycle operating device is mounted to the bicycle body. At least one of the cylinder bore and the reservoir tank is integrally provided with the base member.

Abstract: A bicycle operating device is basically provided with a bracket, an operating member, an actuation cam and a biasing element. The bracket is configured to be coupled to a handlebar. The operating member is pivotally mounted to the bracket about a first axis. The actuation cam is pivotally mounted to the bracket about a second axis. The biasing element includes a coil portion disposed around a third axis that is offset from the first axis. The biasing element biases the operating member relative to the bracket about the first axis toward the actuation cam. The biasing element biases the actuation cam relative to the bracket about the second axis toward the operating member.

Abstract: A bracket cover is configured to cover at least a portion of a bracket that is attachable to a handlebar of a bicycle. The bracket cover includes a cover main body, a first fixing member and a second fixing member. The cover main body includes a portion having a first edge portion and a second edge portion. The portion is between the first and second edge portions being an elastic material. The first fixing member is configured to detachably fix the cover main body to a first side surface of an outer perimeter portion of the bracket at the first edge portion. The second fixing member is configured to detachably fix the cover main body to a second side surface of an outer perimeter portion of the bracket at the side edge portion. The first and second fixing member are separate members from the cover main body.

Abstract: A bicycle operating device comprises a hydraulic unit and a changing unit. The hydraulic unit includes a hydraulic cylinder, a piston, and a reservoir. The hydraulic cylinder includes a cylinder bore. The piston is movably provided in the cylinder bore. The reservoir includes a reserve chamber and a connecting hole. The connecting hole is configured to connect the cylinder bore to the reserve chamber. The changing unit is separately provided from the piston and configured to change a communication state defined between the cylinder bore and the reserve chamber via the connecting hole.

Abstract: A bicycle operating device comprises a base member, an operating member, and a hydraulic unit. The base member comprises a first end portion, a second end portion, and a gripping portion. The gripping portion is provided between the first end portion and the second end portion. The operating member is movably mounted to the base member from a rest position toward an operated position. The hydraulic unit is provided at one of the base member and the operating member. The hydraulic unit comprises a hydraulic cylinder and a piston. The hydraulic cylinder includes a cylinder bore. The piston is arranged in the cylinder bore. The piston is configured to be pulled from an initial position to an actuated position in response to a movement of the operating member from the rest position toward the operated position to supply a hydraulic pressure toward at least one bicycle component.

Abstract: A bicycle operating device comprises a hydraulic unit and a changing unit. The hydraulic unit includes a hydraulic cylinder, a piston, and a reservoir. The hydraulic cylinder includes a cylinder bore. The piston is movably provided in the cylinder bore. The reservoir includes a reserve chamber and a connecting hole. The connecting hole is configured to connect the cylinder bore to the reserve chamber. The changing unit is separately provided from the piston and configured to change a communication state defined between the cylinder bore and the reserve chamber via the connecting hole.

Abstract: A bracket cover is configured to cover at least a portion of a bracket that is attachable to a handlebar of a bicycle. The bracket cover comprises a cover main body. The cover main body is formed in a tubular shape having a first end portion and a second end portion. The cover main body has an opening part extending from at least one of the first end portion and the second end portion such that the opening part forms a first edge portion and a second edge portion.

Abstract: A two-cycle gas engine includes a cylinder, a cylinder head, a piston that defines a combustion chamber with a surrounding wall of the cylinder and the cylinder head, a fuel gas injector, an ignition unit, a scavenging port configured to supply air into the combustion chamber upon the piston being positioned in vicinity of a bottom dead center, a fuel gas injection timing control unit configured to cause the fuel gas injector to inject the fuel gas upon the piston being positioned at 10° to 100° before top dead center in an ascending stroke and to cause the fuel gas injector to inject the fuel gas upon the piston being positioned in vicinity of the top dead center, and an ignition timing control unit configured to ignite the fuel gas inside the combustion chamber upon the piston being positioned in the vicinity of the top dead center.

Abstract: An object is to, in a low-load operating range of a dual-fuel diesel engine or a dual-fuel diesel engine unit including a plurality of the dual-fuel diesel engines, reduce the amount of injection of oil fuel so as to make it possible to make exhaust gas less harmful and to reduce fuel cost. On a cylinder head, a plurality of dual-fuel injectors are disposed, each of which having a gas fuel injector that injects a gas fuel being a main fuel and a pilot fuel injector that injects an oil fuel. In a low-load operating range where it is not necessary for the dual-fuel injectors to inject fuel at the same time for ignition, fuel is injected alternately from the dual-fuel injectors and combusted in every single combustion cycle. As a result, it is possible to halve the amount of injection of oil fuel in the low-load operating range.

Abstract: A fuel gas injection valve according to the present invention includes: a holder including a first injection hole through which fuel gas is injected to produce premixed fuel, and a second injection hole through which fuel gas is injected to produce diffusion fuel; a first needle valve that slidably reciprocates in the holder along an axial direction to open and close the first injection hole and the second injection hole; and a second needle valve having a sealing face on the top thereof and a through-hole provided along the axial direction at the central portion in a radial direction of the second needle valve, the sealing face being brought into contact with a needle valve seat provided in the holder, the first needle valve being slidably inserted into the through-hole, and the second needle valve reciprocating in the holder along the axial direction to prevent fuel gas from circulating to the first injection hole and the second injection hole when the sealing face is in contact with the needle valve seat,

Abstract: A two-cycle gas engine includes a piston that defines a main combustion chamber with a surrounding wall of a cylinder and a cylinder head, a fuel gas injector configured to inject fuel gas, a scavenging port that supplies air into the main combustion chamber upon the piston being positioned in vicinity of a bottom dead center, a precombustion chamber cap that defines a precombustion chamber inside thereof, a fuel injection timing control unit configured to inject the fuel gas into the main combustion chamber and to inject the fuel gas into the main combustion chamber upon the piston being positioned in the vicinity of the top dead center, and an ignition timing control unit configured to ignite a mixed air of the fuel gas and the air inside the precombustion chamber upon the piston being positioned in the vicinity of the top dead center.

Abstract: A two-cycle gas engine includes a cylinder, a cylinder head, a piston that defines a combustion chamber with a surrounding wall of the cylinder and the cylinder head, a fuel gas injector, an ignition unit, a scavenging port configured to supply air into the combustion chamber upon the piston being positioned in vicinity of a bottom dead center, a fuel gas injection timing control unit configured to cause the fuel gas injector to inject the fuel gas upon the piston being positioned at 10° to 100° before top dead center in an ascending stroke and to cause the fuel gas injector to inject the fuel gas upon the piston being positioned in vicinity of the top dead center, and an ignition timing control unit configured to ignite the fuel gas inside the combustion chamber upon the piston being positioned in the vicinity of the top dead center.

Abstract: When shifting to the single combustion mode, an electromagnetic opening-and-closing valve V1 is closed so as to block a gas fuel. Then, an electromagnetic opening-and-closing valve V3 is opened so as to discharge the gas fuel remaining in a gas fuel supply path to the outside of the system. Then, an electromagnetic opening-and-closing valve V2 is opened so as to introduce a replacement gas from a replacement gas reservoir tank to the gas fuel supply path, thereby replacing the contents inside the gas fuel supply path with the replacement gas. After completing the replacement, the electromagnetic opening-and-closing valves V2 and V3 are closed. Next, the electromagnetic opening-and-closing valve V2 is opened and the replacement gas is injected from the gas fuel injectors to a combustion chamber.