The central role in the gearmotor is performed by the gear unit and its gear unit stages, the gear pairs. These features transmit the force of the motor from the input end to the output end. The gear unit therefore functions as a converter of speed and torque.
In most application cases, the gear unit slows down the rotational speed of the motor while at the same time transmitting significantly higher torques than the electric motor alone could provide. With that in mind, the design of the gear unit determines whether a gearmotor is suitable for light, medium or heavy loads and for short or long power-applied hours.
We refer to a reduction ratio or gear ratio based on whether a gear unit steps down or steps up the incoming speed from the motor (called the input speed). The speed ratio i between the input speed and output speed of the gear unit serves as a measure of this.
Power, speed, and precision These are the key features of servo gearmotors. Here too, our modular system is the key to unlocking extensive combination options and makes the most diverse variety of gear unit and motor constellations in this field possible. The ideal gearmotor can be created for every requirement.
For applications in which the drive speed has to be seamlessly adjusted, our mechanical variable speed gearmotors come into play. These are the type of requirements for simple conveyor belts or agitators, for instance, with speed levels that constantly have to be adapted to different process sequences. The speed can be seamlessly adjusted either using a handwheel or remote control.
A worm gear is a type of staggered shaft gear that transmits motion between two shafts that are neither intersecting nor parallel. Even though it is compact it can provide a large speed reduction.A worm gear is a thread cut into a round bar, and a worm wheel is a gear that meshes with the worm at a shaft angle of 90 degrees. The set of a worm and worm wheel is called a worm gear.Its history is so old that its existence is described by Archimedes in around 250 BC.
When a worm gear is used, a compact and high speed reduction ratio can be obtained as compared with spur gears.The reduction ratio is determined by the combination of the number of worm threads and the number of teeth on the worm wheel. For example, in the case of the worm gears of the KHK's standard gears, a reduction ratio of up to the maximum of 1/120 can be obtained.
Worm gear is one type of gear device in which the two shafts are at a right angle or near right angle and non-intersecting. There are one or more teeth which are screw shaped, resulting in a gear that looks like a worm. The mating gear is called a worm wheel; together they are called worm and worm wheel or simply worm gear (worm gear device). As shown in Figure 6.1, a high ratio speed reduction in a small space can be obtained compared to spur gears. Therefore when a large speed reduction is desired in one quick stroke, it is common practice to use the worm as the prime mover. However, on rare occasions, the worm wheel is used as the prime mover in a speed increasing application.
In the case of when two axes are non-intersecting, consider a pair of screw gears in which the pinion gear teeth have been reduced to one or few teeth. Then the pinion becomes the shape of an ordinary screw and a large speed reduction can be obtained as shown in Figure 6.2(a). At this point, the meshing is point contact and can carry only a small load and tends to create friction. However, by using a hob cutter in the shape of the pinion and rotating the cutter equivalent to the motion of worm against the worm wheel, it is possible to obtain a gear set with a line contact. This is the usual worm gear shown in Figure 6.2(b) where the small gear is the worm and the larger gear is the worm wheel.
When the number of threads of a worm is one, as the worm shaft rotates once, the worm gear advances one tooth, while when the number of threads of a worm is 2, the worm gear moves just two teeth. This indicates that a set of worm-worm gear can achieve great speed reduction in one step. By the way, when there are more than two threads in a worm, it is called multi-thread worm.
If the COA says that the transmission is a 4-speed and is serial number 165163 why is the transmission serial number 3080097? The simple answer is that it is a replacement transmission. It is interesting that 165163 is only 51 transmissions from the last 1967 912 4-speed and 3080097 is the 97th 1968 911 4-speed transmission. One could imagine that the original transmission as listed on the COA was faulty and was replaced either at the factory or soon after with 902/0 3080097. The "3" means 911; "0" means 4-speed; "8" means model year 1968; the remaining four digits are sequential. Both are transmission type 902/0 which is found in both the 911 and 912 through October 1967 in early model year 1968. Because they both are the same transmission type it means that both have the same gear ratios.
Electric-powered irrigation pumps are widely used in the U.S. In 2013, nearly 428,000 irrigation pumps were powered by electric motors in the U.S. (Farm and ranch irrigation survey, 2013). As such, there are significant opportunities for energy savings that can be achieved by improving the performance of irrigation pumping plants. Conducting energy audit studies helps in assessing the efficiency of these systems. One of the most important first steps is to accurately identify installed equipment. Original installation notes or manuals are often lost, leaving it up to the energy auditor to identify the make, model and serial numbers of pumping plant system components. In the case of electric motors and gear drive units, nameplates often remain intact and attached to the equipment, giving the auditor a wide variety of important information to accurately evaluate system efficiency.
Basic knowledge of the terms listed on a nameplate allows the auditor to better understand the performance limits of the motor and gear drive, as well as their combined efficiency. The purpose of this Fact Sheet is to explain the meaning and purpose of nameplate information and show how to use nameplate and measured motor speed to calculate motor loading.
Gear drives play an important role in agricultural machinery. Prior to variable speed drives, changing drive-to-driven gear or pulley ratios was the only way to vary delivery shaft speed and torque. Gear drives are not only used to transmit and vary both, but also to alter power delivery orientation (angle). For example, a right-angle gear drive transposes power from a horizonally-mounted motor to the vertical driveshaft of a turbine pump.Gear drives have nameplates that are not as detailed as an electric motor. Figures 5 and 6 illustrate this fact.
The serial number (Figure 5) of a gear drive is often expressed using a combination of letters and numbers. These will vary from company to company, depending on the type of the gear drive. Letters S, SH and SL denote three different types of gear drives: standard hollow shaft drive with standard thrust capacity, standard hollow shaft drive with heavy thrust capacity and standard hollow shaft drive with opposed thrust capacity, respectively.
RatioThe listed ratio represents the ratio of the input speed to output speed of the gear drive. A 1:1 ratio means motor and pump shaft speed are identical (Figure 6). A 1:1.5 ratio for a motor running at 1,770 rpm means pump drive speed will be: 1,780 rpm (1/1.5) = 1,190 rpm. Output speed is important when determining suitability of a particular pump for a given set of depth, flow and pressure conditions.
In 1967 and 1968 the serial number got a year designator and a letter designator for the month such as P8A01, meaning January 1st 1968.If you have a Muncie dated with a December build date it was actually built the prior year. An example would be the date code P8T13. The T stands for December and 13 is the day. This is for a 1968 production car. This means the Muncie was assembled December 13, 1967 for the 1968 model year. To confirm this simply look at the VIN number. It will usually begin with a 18S101350 or a 28N12950. The VIN number will usually be a low number.
When a number of objects are created from the same class blueprint, they each have their own distinct copies of instance variables. In the case of the Bicycle class, the instance variables are cadence, gear, and speed. Each Bicycle object has its own values for these variables, stored in different memory locations. 2b1af7f3a8