摘要:
A piston unit includes a piston which has a rolling element seat configured to rotatably support a rolling element. The rolling element seat has a bearing surface with a surface coating composed of a polymer compound or with a ceramic surface coating.
摘要:
The pump includes a housing containing a hollow elongated part, a piston arranged to move back and forth inside an elongated part, an inlet port and an outlet port arranged so that a fluid can be sucked through the inlet port into a chamber during an instroke of the piston and expelled through the outlet port during an outstroke. A linearly and/or angularly actuable valve system has a valve holder mounted on the pump housing which includes at least one through-hole extending from the piston chamber to the housing outer surface. The valve holder contains an inlet and/or outlet to alternately connect the inlet and outlet ports of the volumetric pump.
摘要:
An electro-hydraulic piston pump system comprising an electric motor (16), first and second hydraulic piston pumps (30,60), a first hydraulic actuator (90) having a first port (93) connected directly to a first port (48) of the first pump and a second port (94) connected directly to a second port (49) of the first pump, a second hydraulic actuator (100) having a third port (103) connected directly to a third port (78) of the second pump and a fourth port (104) connected directly to a fourth port (79) of the second piston pump, wherein an external force applied to the first hydraulic actuator (90) that provides a negative pressure differential to the first pump applies an assistive torque to a common motor shaft (18) driving both the first pump (30) and the second pump (60), and an external force applied to the first and second actuators (90,100) that provides a summed negative pressure differential to the first and second pumps (30,60) recharges a power supply for the motor (16).
摘要:
A converter for converting mechanical energy into hydraulic energy and a robot implementing the converter are disclosed. The converter includes a shaft rotated about a first axis relative to a casing, a hub defining a bore about a second axis, the shaft rotating in the bore. The first axis is parallel to the second axis, and a distance between the first axis and second axis defines an eccentricity. At least two pistons are movably disposed in radial housings of the shaft with the at least two pistons bearing against the bore. Movement of the pistons feed a hydraulic fluid into one of two annular grooves of the casing arranged in an arc of a circle about the first axis, and the hub is configured to translate along a third axis to modify the value of the eccentricity between two extreme values.
摘要:
The invention relates to a converter for converting mechanical energy into hydraulic energy and to a robot implementing said converter. The invention can particularly be used in the production of humanoid robots in which autonomy is to be improved. The converter includes a shaft rotated by mechanical energy about a first axis relative to a casing, a hub comprising a bore formed about a second axis, the shaft rotating in the bore, the two axes being parallel and a distance between the axes forming an excentricity, at least two pistons capable of movement in a radial housing of the shaft, the piston bearing against the bore. According to the invention, the movement of the piston feeds a hydraulic fluid into two annular grooves of the casing arranged in an arc of a circle about the first axis, the hydraulic energy being generated by a pressure difference of the fluid present between the two grooves, and the hub is capable of translation along a third axis perpendicular to the first two axes in order to modify the value of the excentricity between two extreme values, one being positive and the other being negative, so as to generate an inversion of the fluid pressures in the grooves, thereby reversing the inlet and discharge roles of these grooves while maintaining the same rotation direction for the shaft.
摘要:
According to one embodiment, a radial fluid device contains a cylinder block mounted for rotation, a first and second plurality of radially extending cylinders, and a first and second cam. The cylinder block contains the first and second plurality of radially extending cylinders, and each radially extending cylinder contains a piston. The cams are disposed about each plurality of radially extending cylinders, and the second cam has at least one more lobe than the first cam.
摘要:
Disclosed is a small rotary cylinder device wherein friction loss is reduced and energy is conserved by reducing effects of a reaction force applied from cylinders to pistons, which is incorporated in a piston composite body and which linearly reciprocates, the piston composite body being eccentrically connected to a first crank shaft rotating about a shaft. Guide bearings (1c) guide linear reciprocation of first and second piston assemblies (7, 8) attached to second tube bodies (6b), which are caused by rotating a first crank shaft (5) about a shaft (4) and rotating a piston composite body (P) about the first crank shaft (5), in the radial direction of a rolling circle of second imaginary crank shafts (14a, 14b), which has a radius 2r and which is centered at the shaft (4).
摘要:
The pump includes a housing containing a hollow elongated part, a piston arranged to move back and forth inside an elongated part, an inlet port and an outlet port arranged so that a fluid can be sucked through the inlet port into a chamber during an instroke of the piston and expelled through the outlet port during an outstroke. A linearly and/or angularly actuable valve system has a valve holder mounted on the pump housing which includes at least one through-hole extending from the piston chamber to the housing outer surface. The valve holder contains an inlet and/or outlet to alternately connect the inlet and outlet ports of the volumetric pump.
摘要:
A piston unit includes a piston which has a rolling element seat configured to rotatably support a rolling element. The rolling element seat has a bearing surface with a surface coating composed of a polymer compound or with a ceramic surface coating.
摘要:
A system (300) for coupling a piston for a hydraulic pump motor is provided for a hydraulic pump motor which includes a central rotor (3) of a pump motor which houses a hydraulic cylinder (14) inside of which a hydraulic piston (13) moves in translation and can push a tappet (18) guided by a hydraulic piston guided in translation by a tappet guide (19), the system (300) including a connection shaft (301) integral by a first end of the tappet (18) guided by a hydraulic piston and traversing the hydraulic piston (13) in the direction of its length via an orifice (307) of the connection shaft whereas a retention spring (304) is supported on the connection shaft (301) in the vicinity of a second end for maintaining this piston (13) in contact with the tappet (18) guided by the hydraulic piston.