Abstract: A trim and tilt device includes: a cylinder; a piston; a rod; and a rod guide. The rod includes a first end to which the piston is fixed, and the piston includes an insertion hole to which the first end of the rod is inserted. Over an entire periphery of the rod guide, a lower end of an outer peripheral surface of the rod guide that is in contact with the inner peripheral surface of the cylinder is located closer to a second end of the rod than a lower end of a first inner peripheral surface of the rod guide where the outer peripheral surface of the rod is slidable. An upper end of an outer peripheral surface of the piston is located closer to the second end of the rod than an upper end of the insertion hole.

Abstract: A steering device includes: a cylinder demarcated into first and second chambers by a piston; a main valve having first and second shuttle chambers; a hydraulic source having first and second discharge ports; a first oil passage configured to connect the first chamber and the first shuttle chamber; a second oil passage configured to connect the second chamber and the second shuttle chamber; a third oil passage configured to connect the first shuttle chamber and the first discharge port; a fourth oil passage configured to connect the second shuttle chamber and the second discharge port; and a tank connected to the main valve via the third oil passage and the fourth oil passage. One of the first shuttle chamber and the second shuttle chamber of the main valve is in an opened state when the hydraulic source is stopped.

Abstract: A hydraulic cylinder device includes: a pump; a valve body disposed so as to partition an inside of a chamber into chambers; and a non-return valve including a movable member, an elastic member and a support member. The movable member moves to open/close one opening portion that is an opening portion on the one chamber side in a case that forms a flow channel from the one chamber toward an exterior. The elastic member gives force to the movable member in a direction to close the one opening portion, and has one end portion supported by the movable member. The support member is disposed to close an opening portion on the exterior side in the case to support the other end portion of the elastic member, and has a through hole that serves as a throttle of the flow channel from the one chamber toward the exterior.

Abstract: A steering device includes: a flow passage forming member including a first flow passage connecting to a first chamber and a second flow passage connecting to a second chamber; a movable member movable relative to the flow passage forming member; a seal member configured to seal a space between the movable member and the flow passage forming member when the seal member is in contact with the movable member and the flow passage forming member; an operation part capable of rotating an outboard motor; and a resistance reducing part configured to reduce a flow resistance so that a fluid flows between the first and second flow passages even with a pressure generated in the first chamber or the second chamber due to an operation of the operation part by a load equal to or lower than a predetermined load, when sealing is not made by the seal member.

Abstract: A steering device includes: a cylinder demarcated into first and second chambers by a piston; a main valve having first and second shuttle chambers; a hydraulic source having first and second discharge ports; a first oil passage configured to connect the first chamber and the first shuttle chamber; a second oil passage configured to connect the second chamber and the second shuttle chamber; a third oil passage configured to connect the first shuttle chamber and the first discharge port; a fourth oil passage configured to connect the second shuttle chamber and the second discharge port; and a tank connected to the main valve via the third oil passage and the fourth oil passage. One of the first shuttle chamber and the second shuttle chamber of the main valve is in an opened state when the hydraulic source is stopped.

Abstract: A trim and tilt device includes: a cylinder; a piston; a rod; and a rod guide. The rod includes a first end to which the piston is fixed, and the piston includes an insertion hole to which the first end of the rod is inserted. Over an entire periphery of the rod guide, a lower end of an outer peripheral surface of the rod guide that is in contact with the inner peripheral surface of the cylinder is located closer to a second end of the rod than a lower end of a first inner peripheral surface of the rod guide where the outer peripheral surface of the rod is slidable. An upper end of an outer peripheral surface of the piston is located closer to the second end of the rod than an upper end of the insertion hole.

Abstract: A piston structure body includes: a piston that includes a through hole, an inner circumferential portion, and an outer circumferential portion, the through hole being a hole that is formed to penetrate the piston axially through a center of a first face that is an end face on one end side in an axial direction, the inner circumferential portion defining the through hole and connected to the first face, the outer circumferential portion disposed to surround the inner circumferential portion and connected to the first face; and a piston rod that is inserted through the through hole. A first end face that is an end face of the inner circumferential portion on a back face side of the first face is positioned more closely to the first face than a second end face that is an end face of the outer circumferential portion on the back face side.

Abstract: A steering device includes: a cylinder; a normal/reverse rotation type hydraulic power source; an oil storage tank; a first oil passage that connects the cylinder with the hydraulic power source; a second oil passage that connects the cylinder with the hydraulic power source; an oil passage group that includes at least one oil passage connecting at least one of the first oil passage and the second oil passage with the oil storage tank; and a changeover valve group that performs changeover between a state in which hydraulic oil recovered from the cylinder flows back to the oil storage tank and a state in which hydraulic oil supplied from the hydraulic power source to the cylinder does not flow back to the oil storage tank, in accordance with a state of hydraulic oil supplied by the hydraulic power source.

Abstract: Provided is an outboard motor raising and lowering apparatus that is capable of automatically changing the speed of raising/lowering an outboard motor according to a status of the outboard motor. The outboard motor raising and lowering apparatus (1) includes: a first fluid passage that connects a pump (42), a second chamber(s) of one or more tilt cylinders (14), and a second chamber(s) of one or more trim cylinders (12); a second fluid passage that is connected to the first chamber of at least one of the one or more trim cylinders; and a switching valve (60) provided at the second fluid passage.

Abstract: Provided is an outboard motor raising and lowering apparatus that is capable of automatically changing the speed of raising/lowering an outboard motor according to a status of the outboard motor. The outboard motor raising and lowering apparatus (1) includes: a first fluid passage that connects a pump (42), a second chamber(s) of one or more tilt cylinders (14), and a second chamber(s) of one or more trim cylinders (12); a second fluid passage that is connected to the first chamber of at least one of the one or more trim cylinders; a switching valve (60) provided at the second fluid passage; and a control section (100) configured to control the switching valve with reference to a watercraft status signal.

Abstract: A hydraulic cylinder device includes: a pump; a valve body disposed so as to partition an inside of a chamber into chambers; and a non-return valve including a movable member, an elastic member and a support member. The movable member moves to open/close one opening portion that is an opening portion on the one chamber side in a case that forms a flow channel from the one chamber toward an exterior. The elastic member gives force to the movable member in a direction to close the one opening portion, and has one end portion supported by the movable member. The support member is disposed to close an opening portion on the exterior side in the case to support the other end portion of the elastic member, and has a through hole that serves as a throttle of the flow channel from the one chamber toward the exterior.

Abstract: A steering device includes: a cylinder; a normal/reverse rotation type hydraulic power source; an oil storage tank; a first oil passage that connects the cylinder with the hydraulic power source; a second oil passage that connects the cylinder with the hydraulic power source; an oil passage group that includes at least one oil passage connecting at least one of the first oil passage and the second oil passage with the oil storage tank; and a changeover valve group that performs changeover between a state in which hydraulic oil recovered from the cylinder flows back to the oil storage tank and a state in which hydraulic oil supplied from the hydraulic power source to the cylinder does not flow back to the oil storage tank, in accordance with a state of hydraulic oil supplied by the hydraulic power source.

Abstract: A piston structure body includes: a piston that includes a through hole, an inner circumferential portion, and an outer circumferential portion, the through hole being a hole that is formed to penetrate the piston axially through a center of a first face that is an end face on one end side in an axial direction, the inner circumferential portion defining the through hole and connected to the first face, the outer circumferential portion disposed to surround the inner circumferential portion and connected to the first face; and a piston rod that is inserted through the through hole. A first end face that is an end face of the inner circumferential portion on a back face side of the first face is positioned more closely to the first face than a second end face that is an end face of the outer circumferential portion on the back face side.

Abstract: Provided is an outboard motor raising and lowering apparatus that is capable of automatically changing the speed of raising/lowering an outboard motor according to a status of the outboard motor. The outboard motor raising and lowering apparatus (1) includes: a first fluid passage that connects a pump (42), a second chamber(s) of one or more tilt cylinders (14), and a second chamber(s) of one or more trim cylinders (12); a second fluid passage that is connected to the first chamber of at least one of the one or more trim cylinders; and a switching valve (60) provided at the second fluid passage.

Abstract: Provided is an outboard motor raising and lowering apparatus that is capable of automatically changing the speed of raising/lowering an outboard motor according to a status of the outboard motor. The outboard motor raising and lowering apparatus (1) includes: a first fluid passage that connects a pump (42), a second chamber(s) of one or more tilt cylinders (14), and a second chamber(s) of one or more trim cylinders (12); a second fluid passage that is connected to the first chamber of at least one of the one or more trim cylinders; a switching valve (60) provided at the second fluid passage; and a control section (100) configured to control the switching valve with reference to a watercraft status signal.

Abstract: A first case accommodating a first check valve of a switching valve switching a flow of hydraulic fluid to one of a first chamber and a second chamber of a cylinder device, an inside of which is segmented into the first chamber and the second chamber by a piston, and a second case which is stacked on the first case and in which a first actuation valve of the switching valve is accommodated to be displaced in a direction of stacking the first case are provided. A first valve chamber, accommodating the first actuation valve, of the second case has a pressure receiving surface on which pressure of hydraulic fluid that acts on the first valve chamber acts toward the first case.