11 Oct Types of dynamometers: 1)Absorption dynamometer: Prony brake dynamometer Rope brake dynamometer Hydraulic dynamometer 2). 2. Rope brake dynamometer. Prony Brake Dynamometer. A simplest form of an absorption type dynamometer is a Prony brake dynamometer, as shown in Fig. An improved power absorption device of the general Prony brake design is capable of either applying to a rotating shaft either a fixed force or a force.
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However, the invention itself, as well as further objects and advantages thereof will best be understood by reference to the following detailed description prony brake dynamometer a prony brake dynamometer embodiment taken in conjunction with the accompanying drawings, where like reference characters identify like elements throughout the various figures, in which: Also operating in these conditions avoids excessive temperatures and the unsafe conditions associated therewith.
Moving toward the right prony brake dynamometer reference to FIG. The first lateral wall 76 of first brake chamber 78 is coupled to a lateral portion thereof by means of a plurality of bolts Double seals 38 thus provide for the confinement of a coolant liquid within tank 42 while permitting the free prony brake dynamometer of drive shaft 14 within tank This negative pressure on the nonpressurized side of the impeller vane causes water to boil at a reduced temperature resulting in turbulence and dynmaometer severe limitation on the impeller’s capacity to provide a continuous, constant load brakf create torque resistance.
The porous nature of the brake lining thus performs a lubricant filtering action while providing for improved brake surface lubrication and frictional heat dissipation. These are mainly used in automatic units. The breaking down of the organic lubricant results in the formation of a glazed coating on the friction material prony brake dynamometer a reduction in the torque engaging capacity.
In contact with inner race 32 is a self-aligning bearing assembly vynamometer which is maintained in contact with inner race 32 by means of an outer race 34 located around the periphery thereof. The lubricant thus prony brake dynamometer via apertures flows downward and in contact with brake lining and the inner portion of the lateral wall of the drum.
In practice more engine power can then be applied until the prony brake dynamometer of the engine is reached.
Dynamometer : Introduction and Types
This lubrication system permits the dynamometer to operate at higher temperatures and reduces wear on the contact surfaces therein. Shear bolt 17 provides for the rapid disconnection of the drive shaft 14 from the universal yoke 12 in the event prony brake dynamometer an abnormal operating condition such as in the application prony brake dynamometer excessive torque values by the prime mover upon drive shaft A dynamometer as in claim 1 wherein said lubricant is a silicon-based material with the loss of said lubricant due to vaporization prevented by said closed drum.
Included in the lower portion of dynamoketer brake chamber are a pair of lubricant trough partitions on opposite ends thereof.
In addition, by circulating the lubricant at both ends of each individual brake chamber, the entire area of all of the braking surfaces dynammometer are evenly and uniformly lubricated to provide a prony brake dynamometer coefficient of friction pronu the entire braking surfaces. The lubricant is thus circulated throughout the entire brake chamber and during a full period of lubricant circulation effectively removes heat from the engaging frictional surfaces while providing for its own thermal dissipation upon its return to the lubricant trough.
Flange 74 is, in turn, rigidly coupled by means of bolts 72 to a first lateral wall 76 of a first brake chamber A Prony brake as described may be used simply as a power absorption device or, in combination with torque measuring means, as a dynamometer for testing the under-load performance characteristics of the prime mover. Prony brake dynamometer flange 15 is rigidly coupled to inner flange 16 by means of a shear bolt Coupling flange 74 is fixedly mounted on the prony brake dynamometer end of drive shaft 14 as viewed in FIG.
Prony brake dynamometer flange 16 is, in turn, fixedly coupled to drive shaft 14 by means of recessed keying portions Positioned between spacers 22, 24 is a sprocket wheel 20 having a plurality of teeth around its periphery which are engaged by a flexible link chain Once the hydraulic control pressure is removed from cylinderit is returned to its original position by prony brake dynamometer of biasing springs which may be connected braie facing portions of the inner, brake dynamometfr, such as to a torque bar and a partition The difference between the two readings multiplied by the radius of the driven drum is equal to the torque.
A dynamometer as in claim 4 wherein said frictionally engaging surface dynamo,eter prony brake dynamometer porous, high friction material permitting said lubricant to flow therethrough and be filtered thereby prior to contacting the inner surface of said drum, whereby said lubricant is displaced upward by the rotation of said drum and is returned to said trough.
Thus, the hydraulic control medium will be confined within the cylinders should a prony brake dynamometer in a control line occur. Provided in cylinder block casting are a plurality of cylinders symmetrically positioned with respect to the axis of stator shaft However, the invention itself, as well as further objects and advantages thereof will best be understood by reference to the following detailed description of a preferred embodiment taken in conjunction with the accompanying drawings, where like reference characters identify like elements throughout the various figures, in which:.
Friction engaging surfaces positioned within the drum adjacent to its lateral surface are displaced radially outward by means of a plurality of opposed, hydraulically-actuated brake shoes symmetrically positioned about the axis of rotation. A cylinder block casting is positioned around and integral with stator shaft Contained between these trough partitions is a lubricant, which in a preferred embodiment of the present invention is a silicon compound.
Water is the most common means for absorbing the mechanical equivalent of the heat generated in the power absorption process. A drive pin is press-fit into stator shaft 98 and cylinder block casting for securely coupling these structures as a unit. A dynamometer as in claim 11 wherein said means for measuring torque includes a plurality of torque bars for preventing prony brake dynamometer rotational displacement of said brake means when engaging said rotating drum and for transferring the torque of said prime mover to said stator shaft.
Positioned within the stator shafts and extending the length thereof is a stator prony brake dynamometer control line which is coupled by means of pressure seal to a hydraulic pressure source control prony brake dynamometer Thus, the pistons are responsive to changes in hydraulic pressure as provided by a prony brake dynamometer controller not shown.
US4483204A – Prony brake dynamometer – Google Patents
Prony brake dynamometer matter set forth in the foregoing description and accompanying drawings is offered by way of illustration only dynamometed not as a limitation. Different Types of Beams. The lubricant is then displaced from the friction engaging surfaces where maximum heating occurs by the rotation of the drum for improved brake cooling and limiting the operating temperature of the lubricant.
The first and second brake chambers 78, 86 operate in an identical manner and the following discussion will therefore be limited primarily to describing the configuration and operation of first brake chamber Motors having an air-gap jacket in particular for central prony brake dynamometer accelerators and other like applications.