Abstract: An underwater propulsive device of a watercraft including a flotation unit on which a user rides. The propulsion device includes: a hollow body coupled to the flotation unit through a strut and extending in a propulsive direction of the watercraft, the inside of the hollow body being divided into a first compartment and a second compartment; a motor in the first compartment; a propeller in the second compartment; and a power transfer shaft extending in the propulsive direction and connecting the motor and the propeller to each other. The first compartment has a waterproof structure. The second compartment has a water inlet disposed closer to the bow than the propeller is and extending along a circumference of the power transfer shaft and a water jet outlet disposed at a stern-side end of the second compartment. The propeller is smaller than the first compartment in diameter.

Abstract: An underwater propulsion unit including a propeller, a motor, and a housing. The motor is disposed further forward in a propulsion direction than the propeller and drives the propeller into rotation. The housing that accommodates the motor and the propeller includes a first portion and a second portion. In the second portion disposed further rearward in the propulsion direction than the first portion, an introduction inlet and a spout outlet are provided. The introduction inlet introduces water into the housing, and water introduced from the introduction inlet and delivered by the propeller is spouted out of the housing. When viewed in a direction parallel to the propulsion direction, the introduction inlet is disposed further outward than the first portion and introduces water into the housing in a direction parallel to the axis of the propeller.

Abstract: At least one embodiment may provide a remote server that can determine occurrence of an abnormal condition in a power transmission system without using a threshold value in advance. There may be provided a remote server that receives operating and non-operating information of a working unit, information on a working date, information on a traveling speed, and information on a load factor of an engine, respectively from a combine harvester. The remote server calculates for each predetermined period an average of the engine load factor while the traveling speed is at or above a predetermined traveling speed with all working units in non-operation. If the average during a predetermined period is in a status of a predetermined difference from the average up to the predetermined period, the remote server determines that a moving power transmission mechanism of a traveling system of the combine harvester is in an abnormal condition.

Abstract: An underwater propulsion unit including a propeller, a motor, and a housing. The motor is disposed further forward in a propulsion direction than the propeller and drives the propeller into rotation. The housing that accommodates the motor and the propeller includes a first portion and a second portion. In the second portion disposed further rearward in the propulsion direction than the first portion, an introduction inlet and a spout outlet are provided. The introduction inlet (21) introduces water into the housing, and water introduced from the introduction inlet and delivered by the propeller is spouted out of the housing. When viewed in a direction parallel to the propulsion direction, the introduction inlet is disposed further outward than the first portion and introduces water into the housing in a direction parallel to the axis of the propeller.

Abstract: An underwater propulsive device of a watercraft including a flotation unit on which a user rides. The propulsion device includes: a hollow body coupled to the flotation unit through a strut and extending in a propulsive direction of the watercraft, the inside of the hollow body being divided into a first compartment and a second compartment; a motor in the first compartment; a propeller in the second compartment; and a power transfer shaft extending in the propulsive direction and connecting the motor and the propeller to each other. The first compartment has a waterproof structure. The second compartment has a water inlet disposed closer to the bow than the propeller is and extending along a circumference of the power transfer shaft and a water jet outlet disposed at a stern-side end of the second compartment. The propeller is smaller than the first compartment in diameter.

Abstract: A remote server is capable of acquiring income distribution of a fishing ground. The remote server receives information on positions of a fishing boat, information on operating days of the fishing boat, and income and fuel consumption of the fishing boat on each operating day or at each position of the operating day. The remote server outputs the income and the fuel consumption for each operating day and makes an income distribution map expressing distribution of corbiculae. The remote server outputs the number of times of receipt of the information on the positions on each operating day on the map and makes a collection spot distribution map expressing distribution of the collection spot by the fishing boat.

Abstract: There is provided a remote server that receives a machine type, an operating day, a position, a load factor, an engine rotational speed, a traveling speed, and a fuel consumption amount. The remote server identifies a working position based on the position, selects past operating days of an operation status corresponding to a current load factor of the same machine at the same working position, identifies a minimum fuel consumption amount out of fuel consumption amounts corresponding to the selected past operating days, and compares a current fuel consumption amount with the past minimum fuel consumption amount. If the current fuel consumption amount is larger than the past minimum fuel consumption amount, the remote server transmits an engine rotational speed and a traveling speed during a working period of the minimum fuel consumption amount, to a predetermined communication terminal corresponding to information for machine identification.

Abstract: At least an embodiment may provide a remote server that can predict overheating of an engine. A remote server may receives an engine rotational speed, an engine load factor, and a cooling-water temperature. The remote server calculates a moving average of the engine load factor during a predetermine time, and calculates a correlation between the moving average of the engine load factor and the cooling-water temperature. If the correlation during a predetermined period is in the status of a predetermined difference from the correlation up to the predetermined period, the remote server predicts occurrence of overheating in a swing working vehicle that is used by a user.

Abstract: There is provided a remote server that receives a machine type, an operating day, a position, a load factor, an engine rotational speed, a traveling speed, and a fuel consumption amount. The remote server identifies a working position based on the position, selects past operating days of an operation status corresponding to a current load factor of the same machine at the same working position, identifies a minimum fuel consumption amount out of fuel consumption amounts corresponding to the selected past operating days, and compares a current fuel consumption amount with the past minimum fuel consumption amount. If the current fuel consumption amount is larger than the past minimum fuel consumption amount, the remote server transmits an engine rotational speed and a traveling speed during a working period of the minimum fuel consumption amount, to a predetermined communication terminal corresponding to information for machine identification.

Abstract: A remote server is capable of acquiring income distribution of a fishing ground. The remote server receives information on positions of a fishing boat, information on operating days of the fishing boat, and income and fuel consumption of the fishing boat on each operating day or at each position of the operating day. The remote server outputs the income and the fuel consumption for each operating day and makes an income distribution map expressing distribution of corbiculae. The remote server outputs the number of times of receipt of the information on the positions on each operating day on the map and makes a collection spot distribution map expressing distribution of the collection spot by the fishing boat.

Abstract: At least one embodiment may provide a remote server that can determine occurrence of an abnormal condition in a power transmission system without using a threshold value in advance. There may be provided a remote server that receives operating and non-operating information of a working unit, information on a working date, information on a traveling speed, and information on a load factor of an engine, respectively from a combine harvester. The remote server calculates for each predetermined period an average of the engine load factor while the traveling speed is at or above a predetermined traveling speed with all working units in non-operation. If the average during a predetermined period is in a status of a predetermined difference from the average up to the predetermined period, the remote server determines that a moving power transmission mechanism of a traveling system of the combine harvester is in an abnormal condition.

Abstract: Disclosed is a transmission device for work vehicles, said transmission device being capable of being used with high-horsepower engines, without an accompanying loss of power transmission efficiency or fuel economy. The transmission device is provided with: an input shaft that transmits power from an engine; a continuously-variable transmission that is disposed on the input shaft and outputs power transmitted from the input shaft, steplessly converting the speed thereof; and a reversing clutch device that outputs, either in a forward rotational direction or a reverse rotational direction, power outputted from the continuously-variable transmission. The reversing clutch device can be selectively switched, and the gear ratio can be steplessly changed by the continuously-variable transmission.

Abstract: At least an embodiment may provide a remote server that can obtain a distribution of revenue and expenditure in a farm field. There may be provided a remote server that receives position information, information on a harvest amount, information on an applying amount of a fertilizer, and information on an instantaneous fuel consumption amount. The remote server calculates a revenue/expenditure distribution map by a total of the revenue and expenditure, using a distribution of the harvest amount in a working area as the revenue and a distribution of the instantaneous fuel consumption amount as the expenditure based on position information of a tractor in one farm field, and using a distribution of the applying amount of the fertilizer and the instantaneous fuel consumption amount as the expenditure based on position information of a combine harvester.

Abstract: At least an embodiment may provide a remote server that can predict overheating of an engine. A remote server may receives an engine rotational speed, an engine load factor, and a cooling-water temperature. The remote server calculates a moving average of the engine load factor during a predetermine time, and calculates a correlation between the moving average of the engine load factor and the cooling-water temperature. If the correlation during a predetermined period is in the status of a predetermined difference from the correlation up to the predetermined period, the remote server predicts occurrence of overheating in a swing working vehicle that is used by a user.

Abstract: An input pulley, an output pulley, a belt wound across the pulleys, a hydraulic cylinder provided to the input pulley, and a hydraulic servo mechanism that controls an operation of the hydraulic cylinder are provided. The hydraulic servo mechanism includes: a valve chest facing an input side movable sheave; a servo spool slidably inserted in the valve chest, and switches an oil passage in communication with a hydraulic chamber of the hydraulic cylinder; and a feedback spool disposed in such a manner that one end comes into contact with the input side movable sheave a bearing disposed in between, and configured to switch the oil passage to maintain a slid position of the input side movable sheave at a position corresponding to a slid position of the servo spool.

Abstract: Provided is a belt-type continuously variable transmission which may prevent a servo spool from sliding even when a movable sieve slides due to reduced pressure in a hydraulic cylinder. A hydraulic servo mechanism comprises a servo spool and a feedback spool, and contiguous members coming into contact with the feedback spool (84) between a hydraulic cylinder and the feedback spool The present invention also comprises a spool position maintaining unit that makes it possible for the contiguous members to slide in relation to a movable side cylinder case when pressure in the hydraulic cylinder is lower than a predetermined value.

Abstract: Disclosed is a transmission device for work vehicles, said transmission device being capable of being used with high-horsepower engines, without an accompanying loss of power transmission efficiency or fuel economy. The transmission device is provided with: an input shaft that transmits power from an engine; a continuously-variable transmission that is disposed on the input shaft and outputs power transmitted from the input shaft, steplessly converting the speed thereof; and a reversing clutch device that outputs, either in a forward rotational direction or a reverse rotational direction, power outputted from the continuously-variable transmission. The reversing clutch device can be selectively switched, and the gear ratio can be steplessly changed by the continuously-variable transmission.

Abstract: A belt-type stepless transmission is provided with: an input shaft; an input pulley having a stationary sheave and a movable sheave; a transmission shaft disposed parallel to the input shaft; an output pulley having a stationary sheave and a movable sheave; a belt wound around the input pulley and the pulley; an output shaft disposed coaxially with the transmission shaft; and a cam mechanism having a sheave-side cam which is provided and affixed to the movable sheave and a shaft-side cam which is provided and affixed to the output shaft and causing the sheave-side cam and the shaft-side cam to make contact with each other to thereby enable the transmission of torque between the movable sheave and the output shaft and apply an axial pressing force corresponding to the torque to the movable sheave.

Abstract: Disclosed is a transmission device for work vehicles, said transmission device being capable of being used with high-horsepower engines, without an accompanying loss of power transmission efficiency or fuel economy. The transmission device is provided with: an input shaft (20) that transmits power from an engine (3); a continuously-variable transmission (40) that is disposed on the input shaft (20) and outputs power transmitted from the input shaft (20), steplessly converting the speed thereof; and a reversing clutch device (50) that outputs, either in a forward rotational direction or a reverse rotational direction, power outputted from the continuously-variable transmission (40). The reversing clutch device (50) can be selectively switched, and the gear ratio can be steplessly changed by the continuously-variable transmission (40).

Abstract: An input pulley, an output pulley, a belt wound across the pulleys, a hydraulic cylinder provided to the input pulley, and a hydraulic servo mechanism that controls an operation of the hydraulic cylinder are provided. The hydraulic servo mechanism includes: a valve chest facing an input side movable sheave; a servo spool slidably inserted in the valve chest, and switches an oil passage in communication with a hydraulic chamber of the hydraulic cylinder; and a feedback spool disposed in such a manner that one end comes into contact with the input side movable sheave a bearing disposed in between, and configured to switch the oil passage to maintain a slid position of the input side movable sheave at a position corresponding to a slid position of the servo spool.