Category Archives for Actuators
Gear Motors
(1) External type: This motor is simple, compact, lightweight, inexpensive, and capable of relatively high-speed rotation. It has a cross-sectional structure similar to that of gear pumps. It requires a drain to be installed for oil seal protection. (2) Internal … Continue reading
Considerations on Yuken Cylinder Selection
(1) Models (JIS B 8367: 1999 Mounting dimensions for hydraulic cylinders) ®7HT: For 7 MPa (1 015 psi), Rectangular Cover, Tie-rod ©10HS: For 10 MPa (1 450 psi), Built-in Cylinder ©10HT: For 10 MPa (1 450 psi), Rectangular Cover, Tie-rod … Continue reading
Telescopic Cylinder
This cylinder uses a multistage tube as a piston rod to obtain a long stroke. It is useful for pistons requiring a more compact housing. Single and double acting types are available.
Single Acting Cylinder (Ram Cylinder)
This is a cylinder that pushes the piston in one way (extending direction). The piston rod is returned by gravitation or a mechanical force.
Double Acting Cylinder
This is a standard cylinder that produces reciprocating motion. It is available in single and double rod types. Fig. 10.1 shows the single rod cylinder. This cylinder is provided with a cushion mechanism, which uses a cushion sleeve to close … Continue reading
Hydraulic Oscillating Actuator
There are some applications in which continuous rotation is not needed. Two examples are industrial mechanisms performing pick-and-place operations and heavy-duty, large-payload robots. Vane motors with one or two vanes are used for limited-rotation applications. The single-vane unit can rotate … Continue reading
Hydraulic Cylinder Construction
Typical construction for cylinders used in industrial applications is shown in Fig. 7.18. The seals are a key feature, as is the rod wiper. Dirt from the environment settles on the rod and will ingress into the hydraulic system if … Continue reading
Hydraulic Cylinder Failure
Standard cylinders are not designed to take a side load. Care must be taken to ensure that binding does not occur during extension or retraction. A designer will use one of the mounting methods shown in Fig. 7.15 to prevent … Continue reading
Hydraulic Cylinder Selection
Cylinder manufacturers typically classify their products as heavy duty, medium duty, and light duty. Pressure ratings up to 6000 psi are available. Some manufacturers build an agricultural-grade cylinder. These cylinders are satisfactory for applications where annual use is limited. A … Continue reading
Types of Hydraulic Cylinders
The types of cylinders are: Double-acting (Fig. 7.14a) Single-acting, spring return (Fig. 7.14b) Double-rod (Fig. 7.14c) Tandem (Fig. 7.14d) Telescoping (Fig. 7.14e) The double-rod cylinder has the same annular area on both sides, so it develops the same maximum force … Continue reading