Hydraulic Tensioners are specialized hydraulic cylinders designed to apply load directly proportional to their cylinder area and pump pressure

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An example is a solution developed in collaboration with a mine to increase operational synergy during longwall coal operations, as reported in Australian Mining magazine's September issue.

Hydraulic Bolt Tensioner

Hydraulic bolt tensioning is an efficient, faster and safer method for tightening large diameter stud bolts to their optimal specified bolt load. Hydraulic pressure mechanically stretches the material of each stud bolt instead of forcefully turning hand tools such as impact wrenches or flogging spaners which may produce torque and friction that cause damage and leakage at their points of connection with flanges or leakage from leakages in joints.

The long state of stud bolt acts like a spring to ensure consistent clamping force across the face of the flange for leak-free operations, and also enables simultaneous use of multiple tools via high pressure hose assemblies connected to one tensioner pump, thus decreasing overall tightening time.

Hydraulic bolt tensioning is an excellent method for achieving desired stud-bolt preload on critical connections in pressure containing vessels, including critical bolted connections with high preload requirements. Reach out to HTI today and learn how to utilize this advanced tooling technology for higher productivity and safety on your project site!

Hydraulic Chain Tensioner

Hydraulic tensioners ensure proper tension on timing chains used to synchronize and rotate crankshaft and camshaft of automotive engines. Oil pressure activates piston that presses against timing chain guide to adjust tension of timing chain guide.

An improved hydraulic tensioner features a spring-controlled oil pressure relief structure to selectively release highly pressurized oil from the tensioner, thus reducing maximum loads experienced by chain and piston, thereby decreasing fuel consumption for engine and increasing durability of chain.

Hydraulic tensioners consist of a tensioner body with an opening designed to accommodate a movable plunger and its shoe contact end contacting both the timing chain and plunger sleeve rim. Furthermore, there is also a one-way ball check valve and coarse-stepped ratchet device installed which prevent collapse when engine oil pressure has dropped off completely.

Hydraulic Linkage Tensioner

Hydraulic tensioner systems rely on the hydraulic plunger's powerful damping force to counter chain transverse vibrations and regulate tension, helping combat transverse chain vibrations while simultaneously maintaining consistent tensioning over time for maximum chain drive performance. However, to achieve maximum chain drive timing system stability and performance it is vital that this damping force remains constant from cycle to cycle.

A typical hydraulic tensioner comprises of an oil supply line, check valve that sits on it and is biased by spring force, reset pin that restricts plunger movement, ratchet mechanism and cylindrical chamber 54 to hold a moveable plunger. When expanding, one-way check valve activates to allow oil from supply line into chamber; oil pressure combined with spring force push outward the distal end 58 of piston.

An accurate dynamic model of a hydraulic tensioner was constructed and studied using machine-hydraulic co-simulation technology in order to investigate its multibody dynamics behavior under various excitation frequencies and amplitudes. Hysteresis curves predicted by our simulation model closely match experimental results, suggesting that its reaction forces can be accurately predicted.

Hydraulic Cylinder Tensioner

Hydraulic Cylinder Tensioners use specialized hydraulic actuators to reach their desired loads. Each actuator features an extensive unidirectional damping capability in order to minimize fluctuating loads and vibration caused by dynamic belt operations.

Control of track tension is achieved using four basic modules or components of this system: Constant Track Length module, Tension Level Feedforward module, Tension Control Feedback module and Passive Tension Overload Protection. Cylinders used in the system are smaller and lighter than traditional mechanical tensioners enabling one operator to operate the system with less effort required to operate it.

Hydraulic Tensioners are specialized hydraulic cylinders designed to apply load directly proportional to their cylinder area and pump pressure, eliminating unknown factors that cause galling and seizing during tightening processes and providing even loading for each stud. Multiple Hydraulic Tensioners working together save time compared with hydraulic torque wrenches while being safer due to having higher power-to-weight ratios and more even loading.