Abstract: A clutch is configured to mechanically establish and disestablish a torque transmission path between an input shaft through which a torque is input and an output shaft through which the torque is output. The clutch includes a sun gear, an internal gear, planetary gears, and a carrier. The sun gear is configured to switch between a fixed state and a non-fixed state. The internal gear is coupled to the input shaft in a torque transmittable manner. The planetary gears are configured to mesh with the sun gear and the internal gear. The carrier is coupled to the output shaft in a torque transmittable manner and configured to support the planetary gears rotatably. The carrier includes a coupling portion to be coupled to a detachment member configured to detach the carrier from the clutch.

Abstract: A clutch includes a sun gear, an internal gear, planetary gears, a carrier, a first area, a second area, and a third area. The carrier has a through hole through which an output shaft extends. The first area is disposed on an inner wall of the carrier defining the through hole. The second area is disposed on an outer surface of the output shaft and is spline-fitted to the first area. The third area is disposed at a position that is on the outer surface of the output shaft and that is closer to the input shaft than the second area is to the input shaft. The third area has a shape that makes the third area rotatable while being fitted to the first area.

Abstract: A motive power transmission mechanism includes a motor, a drive pulley, a driven pulley, a belt, a housing, and a cap. The motor includes an output shaft and a motor main body. The drive pulley is configured to rotate together with the output shaft. The belt is wound across the drive pulley and the driven pulley to transmit torque from the drive pulley to the driven pulley. The housing accommodates the drive pulley, the belt, and the driven pulley. The housing includes a work window which faces the belt and through which the belt undergoes work from outside of the housing. The cap is configured to close the work window when the work is not performed. The cap includes a porous portion having air-permeability and water-impermeability.

Abstract: A steering device includes a clutch and a wheel-turning shaft. The clutch includes an input shaft, an output shaft, a planetary gear mechanism, a housing, and a restriction member. The planetary gear mechanism is coupled to each of the input shaft and the output shaft. The housing is configured to accommodate the planetary gear mechanism and at least part of the output shaft. The restriction member is secured to the housing or constitutes part of the housing. The restriction member is opposed to an outer surface of the output shaft through a gap so as to restrict inclination of the output shaft. The wheel-turning shaft is configured to be displaced in accordance with rotation of the output shaft so as to turn wheels of a vehicle.

Abstract: A dust cover to cover an opening of a housing through which at least one of a shaft and a pipe extends includes a hole-edge portion and a main body. The at least one of the shaft and the pipe is extendable through the through hole. The hole-edge portion defines an edge of a through hole through which the at least one of the shaft and the pipe is extendable. The main body is configured to cover the opening. The main body has a hardness different from a hardness of the hole-edge portion.

Abstract: In a motor-driven power steering apparatus having a preload means which energizes a bearing of a worm gear in a predetermined preload direction, the preload means has a guide case as well as having a bearing case, and the guide case accommodating the bearing case in which the bearing and a spring are accommodated is attached to an attaching portion which is provided in a gear housing.

Abstract: In a power steering apparatus for a small vessel, an electrically driven assist device (26) and a helm pump (27) formed of a swash plate type axial piston pump are arranged in parallel on a common base (28). The electrically driven assist device (26) and the helm pump 27 are connected through a transmission system (34) under the common base 28 and integrated into a steering oil pressure generating unit (6) functioning as the power steering apparatus. The electrically driven assist device (26) is carried on an instrument panel (3). The parallel arrangement of the electrically driven assist device (26) and the helm pump (27) allows the steering oil pressure generating device (6) to be reduced in vertical length, so that it is possible to shorten the distance between the instrument panel (3) and a bottom (2) of the vessel and to lower positions of a handle and an operator's seat, thereby realizing the low center of gravity.

Abstract: In a motor-driven power steering apparatus having a preload means which energizes a bearing of a worm gear in a predetermined preload direction, the preload means has a guide case as well as having a bearing case, and the guide case accommodating the bearing case in which the bearing and a spring are accommodated is attached to an attaching portion which is provided in a gear housing.

Abstract: In a motor-driven power steering apparatus, a guided surface is provided in an outer periphery of a bearing case which retains a bearing of a worm gear, and a gear housing is provided with a guide member having a guide surface which comes into contact with the guided surface of the bearing case so as to guide a motion of the bearing case in an energizing direction of the bearing.

Abstract: In a power steering apparatus for a small vessel, an electrically driven assist device (26) and a helm pump (27) formed of a swash plate type axial piston pump are arranged in parallel on a common base (28). The electrically driven assist device (26) and the helm pump 27 are connected through a transmission system (34) under the common base 28 and integrated into a steering oil pressure generating unit (6) functioning as the power steering apparatus. The electrically driven assist device (26) is carried on an instrument panel (3). The parallel arrangement of the electrically driven assist device (26) and the helm pump (27) allows the steering oil pressure generating device (6) to be reduced in vertical length, so that it is possible to shorten the distance between the instrument panel (3) and a bottom (2) of the vessel and to lower positions of a handle and an operator's seat, thereby realizing the low center of gravity.

Abstract: In a marine gas cylinder apparatus provided with a switching valve apparatus capable of switching a communication state among a piston rod side oil chamber, a piston side oil chamber and a gas chamber, a relief passage communicating a communication chamber of the switching valve apparatus with the gas chamber is provided. A temperature compensating relief valve relieving an oil in the communication chamber to the gas chamber is provided in the relief passage.

Abstract: In a marine gas cylinder apparatus provided with a switching valve apparatus capable of switching a communication state among a piston rod side oil chamber, a piston side oil chamber and a gas chamber, an open timing of a poppet valve provided in a communication passage communicated with a gas chamber is made antecedent to an open timing of poppet valves provided in the other communication passages when opening the switching valve apparatus.

Abstract: In a marine gas cylinder apparatus provided with a switching valve apparatus capable of switching a communication state among a piston rod side oil chamber, a piston side oil chamber and a gas chamber, a relief passage communicating a communication chamber of the switching valve apparatus with the gas chamber is provided. A temperature compensating relief valve relieving an oil in the communication chamber to the gas chamber is provided in the relief passage.

Abstract: In a marine gas cylinder apparatus provided with a switching valve apparatus capable of switching a communication state among a piston rod side oil chamber, a piston side oil chamber and a gas chamber, an open timing of a poppet valve provided in a communication passage communicated with a gas chamber is made antecedent to an open timing of poppet valves provided in the other communication passages when opening the switching valve apparatus.

Abstract: In a tilt device for a marine propulsion unit, a cylinder is constituted by a double pipe having an outer cylinder and an inner cylinder, a piston rod and a piston are received in the inner cylinder, a pressure accumulating chamber is formed between the outer cylinder and the inner cylinder, and a free piston (gas-liquid separating means) is arranged between the pressure accumulating chamber and the piston side chamber.

Abstract: In a tilt device for a marine propulsion unit, a cylinder is constituted by a double pipe having an outer cylinder and an inner cylinder, a rod guide sealing the outer cylinder and the inner cylinder is provided at an end portion of the cylinder, a free piston is arranged in a space between the outer cylinder and the inner cylinder, a liquid discharging chamber is formed in a rod guide side from the free piston of the space, and an absorber valve which can be opened at a time when a pressure of a fluid in the rod side chamber is increased to a level equal to or more than a predetermined value and can feed the fluid in the rod side chamber to the liquid discharging chamber and a return valve which can feed the fluid in the liquid discharging chamber to the rod side chamber are provided in the rod guide.

Abstract: In a tilt device for a marine propulsion unit, a cylinder is constituted by a double pipe having an outer cylinder and an inner cylinder, a rod guide sealing the outer cylinder and the inner cylinder is provided at an end portion of the cylinder, a free piston is arranged in a space between the outer cylinder and the inner cylinder, a liquid discharging chamber is formed in a rod guide side from the free piston of the space, and an absorber valve which can be opened at a time when a pressure of a fluid in the rod side chamber is increased to a level equal to or more than a predetermined value and can feed the fluid in the rod side chamber to the liquid discharging chamber and a return valve which can feed the fluid in the liquid discharging chamber to the rod side chamber are provided in the rod guide.

Abstract: In a tilt device for a marine propulsion unit, a cylinder is constituted by a double pipe having an outer cylinder and an inner cylinder, a piston rod and a piston are received in the inner cylinder, a pressure accumulating chamber is formed between the outer cylinder and the inner cylinder, and a free piston (gas-liquid separating means) is arranged between the pressure accumulating chamber and the piston side chamber.