China
Africa
Explore chapters and articles related to this topic
Introduction to Hydraulic Power
Published in Qin Zhang, Basics of Hydraulic Systems, 2019
As shown in Figure 1.1, a hydraulic power system uses a hydraulic pump to convert the mechanical power supplied by a prime mover (often an internal combustion engine on mobile equipment), which raises the energy level carried by the pressurized hydraulic fluid from zero to the maximum. The potential energy is first delivered to a control valve through a hose. This control valve then regulates the direction and amount of the pressurized fluid to different ports, with more hoses being used to deliver the pressurized fluid to an actuator to drive the load performing the desired work. It should be noted that some hydraulic energy will be lost during the transmission process due to the friction of the fluid flowing from the pump to the actuator, as well as leaking of the pressurized fluid.
Semi-automatic and automatic transmissions
Published in M.J. Nunney, Light and Heavy Vehicle Technology, 2007
Taking the electronic control of a Toyota four-speed automatic transmission as an acclaimed example of modern practice then, apart from control by solenoid valves, the hydraulic portion of the control system is arranged similar to that of a non-electronic version and may be simply represented as a block diagram (Figure 17.21). The hydraulic system therefore comprises a hydraulic pump, the control valve body, the solenoid valves, the accumulators, the stationary and rotating clutches and a band brake servo, together with the usual network of fluid passages to connect these components.
Fluid Power System Malfunction Detection and Diagnosis
Published in Anton H. Hehn, Fluid Power Troubleshooting, 1995
The main function of a hydraulic pump is to move fluids against resistance. The movement of fluid in a hydraulic circuit is incidental to the basic function of power transmission. Our interest is in the transmission of power in the desired plane with certain motion patterns. We seek to control torque and associated rotary force and motion and/or linear force and motion with a piston and cylinder assembly.
Compact water pump and its application to self-contained soft robot hand for vegetable factory
Published in Advanced Robotics, 2023
Kyosuke Ishibashi, Mitsuo Komagata, Hiroki Ishikawa, Osamu Azami, Ko Yamamoto
The dimensions and structure of the developed soft hand are shown in Figure 11. The structure of the hand is the same as the previous hand [23], but the pump has been changed to the water pump described above. It is wide, high, and weighs approximately , including the water pump and electric motor. These dimensions were determined from the average dimensions of a cabbage (diameter , height ). The soft hand consists of (a) soft fingers, (b) pressure sensor, (c) reservoir for water storage (Figure 13), (d) hydraulic pump, (e) electric motor to drive the pump, and (f) water supply port. While most general soft hands require an external pump as a power source, this hand is a self-contained hand with a water pump and reservoir. This hand has the advantages of a short flow path and low pipe loss, as well as being easy to mount on a free-standing mobile robot.
Compact, backdrivable, and efficient design of linear electro-hydrostatic actuator module
Published in Advanced Robotics, 2022
Mitsuo Komagata, Ko Yamamoto, Yoshihiko Nakamura
We assume the following preconditions in the mechanical design of a linear EHA. Joint and link mechanismWe assume the joint and link mechanism for a robot manipulator shown in Figure 3, where a 1-DOF revolute joint is controlled by a linear actuator. There are some candidates of the link mechanism that converts a linear motion to rotational one, including four-bar linkage or slider crank mechanism. We employ swinging slider crank mechanism because of its small number of components.Type of a linear actuatorWe employ a double rod-type cylinder as the linear actuator because it is suitable for closed hydraulic circuits of the EHA where the total volume of oil is constant.Type of a hydraulic pumpAmong various types of a pump, we adopted a gear pump because it is easy to miniaturize due to its simple structure.Configuration of the EHAFor the miniaturization, we integrate the pump and the cylinder compactly. The pump is arranged just side of the cylinder.
Modelling and design of a pneumatic CRONE suspension architecture for ride comfort
Published in Vehicle System Dynamics, 2021
Jean-Louis Bouvin, Xavier Moreau, André Benine-Neto, Vincent Hernette, Pascal Serrier, Alain Oustaloup
The latter [4,5] consists of a hydraulic circuit composed of an arrangement of hydro-pneumatic accumulators and hydraulic resistances connected to a piston that links the chassis to the wheel. The suspension impedance is designed in order to provide outstanding performances in terms of body control under road inputs, robustness of body control to sprung mass variations and vibration isolation as well as independence between load variations and damping coefficient. Such functionalities are obtained by a particular arrangement of the hydraulic components yielding the so called CRONE architecture. The road behaviour (safety) and body control under driver inputs are obtained by an on-off switch that cuts off part of the hydraulic circuit, such that the only useful components are a single hydro-pneumatic accumulator and associated resistance (corresponding to a traditional architecture). Such configuration is called the stiff architecture. A hydraulic pump ensures the suspension rattlespace. This means that the CRONE Hydractive suspension is composed of a CRONE and a stiff architectures.