Choosing the right hydraulic cylinder for your application needs remains a focal point for hydraulic cylinder design and manufacturing. Selecting the correct hydraulic cylinder mounting type can minimize accelerated wear and tear in addition to keeping your cylinder running at optimal performance levels. Stability and strength provided by cylinder mounts can also aid in preventing misalignment issues that can cause hydraulic cylinder failure.
Mounting type means how to install the hydraulic cylinder on your equipment, a basic hydraulic cylinder without rod end connections or base ends, just with drilled holes or thread, it can be installed on the machine. We can talk the mounting type on three components of hydrualic cylinder, rod ends, base ends and body. Rod ends type means the end type of rod or the attachment of rod, which including drilled hole, threaded, fixed eye, cross-tube, clevis, flange, spherical plain bearings, ball head and etc. Base ends type means the end type of base or cap, which including drilled hole, fixed eye, cross-tube, clevis, flange, spherical plain bearings, trunnion and etc. Body type means the shape of body, just bare barrel, or weled on flange, food, trunnion and etc. For the welded hydraulic cylinder, the rod ends and base ends are welded on the body mostly, but for the tie rod type, the base ends are tightened by tie-rods, and the attachment mostly threaded on the rod ends.
Common mount types include:
Flange mounting—Very strong and rigid, but have little tolerance for misalignment. Experts recommend cap end mounts for thrust loads and rod end mounts where major loading puts the piston rod in tension.There are three installation positions: front , middle and rear.
Foot mounting—It is applicable to the fixed installation of the hydraulic cylinder during the working process, and its installation plane is not in the same plane as the cylinder central axis . When selecting this kind of installation, the installed structure must be well positioned and fastened. The installation methods include end and side lug installation.
Clevis mounting—It is applicable to the working condition that the force of the hydraulic cylinder makes the moving machine components in it form a curved motion path along the same motion plane. When driving the machine components for angular operation, the force of the rotating torque is proportional to the angle of the force generated by the lever arm of the machine connecting rod mechanism and the hinged installation.
Trunnion mounting —Absorb force on the cylinder centerline and let the cylinder change alignment in one plane. Common types include clevises, trunnion mounts and spherical bearings. Because these mounts allow a cylinder to pivot, they should be used with rod-end attachments that also pivot. Clevis mounts can be used in any orientation and are generally recommended for short strokes and small- to medium-bore cylinders.There are three installation positions: front , middle and rear.
How to design the best mounting type of hydrualic cylinder?
Depends the application of hydrualic cylinder. We should consider the installation space and the min. and max. mounting size of hydraulic cylinder, and meanwhile we have to consider the requirements of force, pull type or push type. The forces on the piston face and the piston head retainer vary depending on which piston head retention system is used. We can see some typical mounted application as below, the ideal applicaiton for pull and push type.
It is the best method of mounting the cylinder. In this method, cylinder is mounted along with its centerline. In this mounting a specail flange bolted at center is usd to mount the cylinder.
This mounting consists of flange type side cover to the cylinders. These covers can be fitted to parallel surface by means of nuts and bolts. This mounting is adopted when cylinders are to be mounted on the surface parallel to the axis of cylinder.
A cylinder may have Rotational feedom while it is reciprocating. There is three types of pivot mountings, Clevis mounting, Trunion mounting, Tang mounting. Pivot mounting can be self-changing the centerline of cylinder to meet the varied loading direction, is ideal mounting type for side loading which is unequal pressure that is not centered on the cylinder rod. This off-center strain can lead to bending of the rod in extreme cases, but more commonly causes leaking due to warping the circular seals into an oval shape.
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