Abstract: [Problem] In a reduction and reversing gear unit in which hydraulic oil is supplied to a generator motor or the like as cooling oil by a hydraulic pump driven by an electric motor, which is separate from the generator motor, a problem of a noise generated by fully driving the hydraulic pump and the electric motor at all time is solved by assuming a high hydraulic oil temperature when a maximum load acts on the generator motor.

Abstract: In a marine propulsion apparatus that transmits power of at least one of an internal combustion engine (ICE) and a generator motor (GM) mounted on a ship to a propeller via a forward reverse switching mechanism, the marine propulsion apparatus can be downsized as a whole. The marine propulsion apparatus includes a connection switching mechanism capable of selectively connecting the GM to an upstream side and a downstream side of the power transmission from the ICE in the forward reverse switching mechanism. Then, the forward reverse switching mechanism is interposed between the ICE and the connection switching mechanism, and a large torque from the ICE is not directly transmitted to the connection switching mechanism. As a result, it is not necessary to increase the capacity of the connection switching mechanism, and the connection switching mechanism and thus the marine propulsion apparatus can be downsized.

Abstract: In a driving device according to the present invention, an internal space of a fixed housing provided with an electric motor and an electric circuit board configured to control drive of the electric motor is partitioned into a first chamber arranged therein with the electric motor and a second chamber arranged therein with the electric circuit board. The driving device includes a heat dissipation part configured to efficiently dissipate heat generated from the electric circuit board, from the second chamber to the outside of the fixed housing, and thus, heat generated from the electric motor is not easily transmitted to the second chamber via the fixed housing, and moisture is prevented from entering the fixed housing when outside air flows into the fixed housing.

Abstract: A lawn mower includes a traveling driver, a mower motor, and at least one controller. At least one controller is configured to control the traveling driver in accordance with an operation of a user getting on the lawn mower, control the traveling driver to cause the lawn mower to travel autonomously, on a basis of information detected on the lawn mower, and control the mower motor. The lawn mower includes a lawn detection device configured to detect a condition of a portion of lawn on a front side in a traveling direction, and a position acquisition device configured to acquire self-position information. The at least one controller controls the traveling driver in such a manner that the lawn mower preferentially travels on a portion of lawn that needs to be mowed.

Abstract: A motor control system includes a drive motor and a deck motor that are connected to a battery, an ECU, and a key switch. The key switch acquires that an operation unit has been turned on, and transmits a restart permission signal to the ECU. When SOC of the battery reaches or falls below a first threshold set in advance, the ECU performs a step of disabling all the motors, and when the restart permission signal is received, the ECU performs a step of executing a decelerated travelling mode where the disabled state of the drive motor is released and an allowed speed of the drive motor is reduced.

Abstract: A watercraft steering system includes a reverse reduction transmission and an obstacle detector. The reverse reduction transmission is configured to convert power from a main engine into an output for causing a watercraft to make forward travel, neutral, or reverse travel, so as to control navigation of the watercraft. The obstacle detector is disposed at a hull of the watercraft and is configured to detect an obstacle. The watercraft steering system is configured to, based on a location of the obstacle with respect to the hull, a travel direction of the watercraft, a travel speed of the watercraft, and a distance between the hull and the obstacle, select from among the forward travel, the neutral, and the reverse travel, and maintain the travel speed or change the travel speed.

Abstract: A motor control system includes a drive motor and a deck motor that are connected to a battery, an ECU, and a key switch. The key switch acquires that an operation unit has been turned on, and transmits a restart permission signal to the ECU. When SOC of the battery reaches or falls below a first threshold set in advance, the ECU performs a step of disabling all the motors, and when the restart permission signal is received, the ECU performs a step of executing a decelerated travelling mode where the disabled state of the drive motor is released and an allowed speed of the drive motor is reduced.

Abstract: A motor control system includes a drive motor and a deck motor that are connected to a battery, an ECU, and a key switch. The key switch acquires that an operation unit has been turned on, and transmits a restart permission signal to the ECU. When SOC of the battery reaches or falls below a first threshold set in advance, the ECU performs a step of disabling all the motors, and when the restart permission signal is received, the ECU performs a step of executing a decelerated travelling mode where the disabled state of the drive motor is released and an allowed speed of the drive motor is reduced.

Abstract: A motor control system includes a drive motor and a deck motor that are connected to a battery, an ECU, and a key switch. The key switch acquires that an operation unit has been turned on, and transmits a restart permission signal to the ECU. When SOC of the battery reaches or falls below a first threshold set in advance, the ECU performs a step of disabling all the motors, and when the restart permission signal is received, the ECU performs a step of executing a decelerated travelling mode where the disabled state of the drive motor is released and an allowed speed of the drive motor is reduced.

Abstract: Four types of pulley sheaves are common with one another in that each includes a pulley forming body having a tubular portion inserted around the corresponding shaft and a main body portion extending radially outward from one side of the tubular portion in an axis line direction, the main body portion including a conical friction surface inclined to be positioned closer to the other side of the tubular portion in the axis line direction, from an inner side to an outer side in a radial direction. The tubular portion of the pulley forming bodies that forms the driving-side and driven-side fixed pulley sheaves includes a fixing hole, while the tubular portion of the pulley forming bodies that forms the driving-side and driven-side movable pulley sheaves includes a sliding slot that allows the tubular portion to move along the axis line of the corresponding shaft only within the predetermined distance.

Abstract: A method to assemble a marine drive system wherein an acceptable-unacceptable criterion on the torsional vibration of a shaft of the marine drive system is established based on the correlation between the torsional stiffness of a propeller shaft and the moment of inertia of a propeller. A desirable elastic coupling for the marine drive shaft is selected based on the criterion. The marine drive system is assembled by using a flywheel, a marine reverse and reduction gear, and an elastic coupling, whose property is changeable, lying between an input shaft of the marine reverse and reduction gear and the flywheel.

Abstract: A self-contained marine reversing gear assembly is provided with a locking device for an internal combustion engine in which introduction of the working oil from the lubricating oil circuit is unnecessary. The locking device includes an input shaft driven by an internal combustion engine; an output shaft connected to a propeller shaft; a hydraulic pump driven by the input shaft; a hydraulic forward and reverse clutch; a directional control valve for switching the forward and reverse clutch by the supply of working oil from the hydraulic pump; and a locking device provided with a locking mechanism member for locking the output shaft. The locking device includes a hydraulic actuator for unlocking the output shaft by operating on the locking mechanism member due to the supply of working oil from the hydraulic pump.

Abstract: An object of the present invention is to provide improved torsional rigidity of an elastic coupling for use in a marine engine which couples an engine to a reversing gear. The elastic coupling comprises at least one low-rigidity element providing torsional rigidity during transmission of a predetermined low torque; and at least one high-rigidity element providing, during transmission of a predetermined high torque, torsional rigidity higher than that provided by the low-rigidity element.

Abstract: The present invention provides a self-contained marine reversing gear assembly provided with a locking device for internal combustion engine in which introduction of the working oil from the lubricating oil circuit is unnecessary. The marine reversing gear assembly provided with a locking device of the present invention comprises an input shaft driven by an internal combustion engine; an output shaft connected to a propeller shaft; a hydraulic pump driven by the input shaft; a hydraulic forward and reverse clutch; a directional control valve for switching the forward and reverse clutch by the supply of working oil from the hydraulic pump; and a locking device provided with a locking mechanism member for locking the output shaft, the locking device comprising a hydraulic actuator for unlocking the output shaft by operating on the locking mechanism member due to the supply of working oil from the hydraulic pump.

Abstract: The present invention provides a method to assemble a marine drive system wherein an acceptable-unacceptable criterion on the torsional vibration of a shaft of the marine drive system is established based on the correlation between the torsional stiffness of a propeller shaft and the moment of inertia of a propeller; a desirable component for the marine drive shaft is selected based on the criterion; and the marine drive system is assembled by using the selected components, the marine drive system comprising a flywheel 2, a marine reverse and reduction gear 4, and a elastic coupling 3, whose property are changeable, lying between an input shaft of the marine reverse and reduction gear 6 and the flywheel 2; and the component for the shaft of the marine drive system is the elastic coupling.