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Belts, Chains, Clutches, and Brakes
Published in Ansel C. Ugural, Youngjin Chung, Errol A. Ugural, MECHANICAL DESIGN of Machine Components, 2018
Ansel C. Ugural, Youngjin Chung, Errol A. Ugural
The centrifugal clutch is in widespread use for automatic operation, such as to couple an engine to the drive train. When the engine speed increases, it automatically engages the clutch. This is particularly practical for electric motor drives, where during starting, the driven machine comes up to speed without shock. Used in chain saws for the same purpose, centrifugal clutches serve as an overload release that slips to allow the motor to continue running when the chain jams in the wood.
Belts, Chains, Clutches, and Brakes
Published in Ansel C. Ugural, Youngjin Chung, Errol A. Ugural, Mechanical Engineering Design, 2020
Ansel C. Ugural, Youngjin Chung, Errol A. Ugural
The centrifugal clutch is in widespread use for automatic operation, such as to couple an engine to the drive train. When the engine speed increases, it automatically engages the clutch. This is particularly practical for electric motor drives, where during starting, the driven machine comes up to speed without shock. Used in chainsaws for the same purpose, centrifugal clutches serve as an overload release that slips to allow the motor to continue running when the chain jams in the wood.
Mechanical principles of dynamic engineering systems
Published in Alan Darbyshire, Charles Gibson, Mechanical Engineering, 2023
Alan Darbyshire, Charles Gibson
In its simplest form a centrifugal clutch consists of a drive shaft to which are attached two or more spring loaded masses. These are lined with a friction material on their outer surfaces and rotate inside a drum which is fixed to the output shaft (see Figure 2.26).
The effect of wood species on chainsaw vibrations during bucking operations
Published in International Journal of Forest Engineering, 2023
Masoud Feyzi, Ali Jafari, Hojat Ahmadi
Reducing and controlling the chainsaw vibrations are the most viable strategies for minimizing the negative impacts of the longtime usage of this machine (Ko et al. 2011). A better design of the chainsaw is possible in the light of identifying the influential factors in triggering the vibrations. To achieve this, one needs to first evaluate both the level and characteristics of the vibrations and second, recognize the main sources of the vibrations. The model of the chainsaw, its age, maintenance condition, component configuration, the body features of an operator, and wood species with different characteristics can all affect the vibrations (Hutton et al. 1993; Rottensteiner et al. 2012; Rottensteiner and Stampfer 2013; Rukat et al. 2020). Internal combustion engine chainsaws are activated by a two-stroke gasoline engine. When the spinning speed of the engine increases, the centrifugal clutch of this system expands and a chain with a set of teeth is moved along a guide bar. The force generated by the engine is one main reason for the vibrations (Ko et al. 2011). In addition, chainsaws have some reciprocating and rotating components with their own specific vibrations at different frequencies.
A five-target innovation discussion on low-speed wind turbine system optimization
Published in Energy Sources, Part A: Recovery, Utilization, and Environmental Effects, 2021
Just as system optimization required a compromise for GRR, another compromise may be beneficial in regards to the components that maximize the conversion efficiency of generation equipment. As previously mentioned, without a gearbox, the blades of the turbine are reliant only on wind speed to rotate the generator. One plausible solution would be to install a centrifugal clutch (CC) to perform a similar role as a gearbox. The CC would be mounted directly upon the shaft of the WTs drivetrain and act as a dual rotor generator. These operate with an inner race, or low-speed rotational setting, and an outer race, or high-speed rotational setting. A spring between two weights wraps around the inner race which withholds the outer race from being engaged at low speeds. Once wind speeds are high enough, centrifugal force overcomes the moment of inertia for the springs and the outer race is engaged. Figure 6 depicts how centrifugal forces engage the clutch between a low-speed rotational setting and a high-speed rotational setting. Because taller towers will make higher wind speeds accessible at increased heights, this could prove to be a novel concept for LWST application. The vision here is that the CC would torque a low-speed PM generator rotor at decreased wind speeds while having the capabilities to engage a separate high-speed PM generator rotor at HWSs. This could improve the capabilities of the generator by matching power production to variable wind speeds, thus broadening the range of the WT’s rated power. Also, implementing this CC design could accomplish multiple goals of the target innovations for generator equipment previously mentioned. One way this potential upgrade would maximize the conversion efficiency of generator equipment is by increasing the rotational speed of the generator rotor at HWSs. Furthermore, both goals of increasing the poles of the generator and implementing a supplemental rotor are simultaneously achieved from this dual rotor CC design.