The Orbitless Drive

2016 ◽  
Author(s):  
Leo Stocco
Keyword(s):  
Low Noise ◽  
Reduction Ratio ◽  
Ring Gear ◽  
Viable Option ◽  
Noise Vibration

A fixed low-ratio Epicyclic drive is developed that resembles a Planetary drive but has crank-shaft pinions and an additional carrier replacing its ring gear. It provides half the reduction ratio of a Planetary drive with similar pinions, making reduction ratios at or near 2:1 practical. It shares many properties with a Planetary drive such as torque splitting and co-axial drive shafts that spin in a common direction but with no ring gear, reverse bending, or assembly criteria. It has many optional configurations and modes, does not slip or jam, is easily back-driven, has low pitch and bearing velocities, and favorable churning properties. It is a viable option for both reduction and overdrive applications that promises low noise / vibration / harshness (NVH) levels.

The Coupled Orbitless Drive

2016 ◽  
Author(s):  
Leo Stocco
Keyword(s):  
Low Cost ◽  
Reduction Ratio ◽  
The Sun ◽  
Ring Gear ◽  
Viable Option ◽  
Speed Reduction ◽  
Input And Output ◽  
High Reduction ◽  
The Difference

In an associated work [9], a low-ratio Epicyclic drive is developed that resembles a Planetary drive but has crank-shaft pinions, an additional carrier replacing its ring gear, and half the reduction ratio of a similarly sized Planetary drive. Adding couplings that reverse the sun and planet engagement, further reduces the ratio below unity. Interchanging the roles of the input and output shafts results in high reduction ratios similar to a Cycloid drive. Like a Cycloid drive, it has co-axial drive shafts and a reduction ratio that depends on the difference between gear pitch diameters. Unlike a Cycloid drive, the drive shafts spin in a common direction, torque is split between multiple co-planar transmission paths, and no ring gears are required. It has many optional configurations, none of which slip or jam, and is a viable option for speed reduction applications that require low cost and complexity in a compact package.

scholarly journals Electric vehicles diffusion: changing pavement acoustic design?

Noise Mapping ◽  
2021 ◽  
Vol 8 (1) ◽  
pp. 281-294
Author(s):  
Filippo Giammaria Praticò ◽  
Rosario Fedele
Keyword(s):  
Internal Combustion Engine ◽  
Electric Vehicles ◽  
High Frequency ◽  
Combustion Engine ◽  
Urban Ecosystem ◽  
Low Noise ◽  
Acoustic Design ◽  
Road Pavement ◽  
Alerting System ◽  
Noise Vibration

Abstract Electric vehicles (EVs) are progressively entering into the current noisy urban ecosystem. Even though EVs are apparently quieter than traditional Internal Combustion Engine Vehicles (ICEVs), they have an impact on noise maps and road pavement designers should take this into consideration when designing future low-noise road pavements. Consequently, the main objective of this study is to define what are the most important aspects that road pavement designers should take into account. For this reason, in this paper, the noise emitted by EVs was analysed, considering parameters (e.g., speed and frequency) and comparisons, in order to identify crucial characteristics. Results show that EV noise could call for the improvement of pavement acoustic design due to the Acoustic Vehicle Alerting System (AVAS), high-frequency peaks, and noise vibration harshness.

scholarly journals INVALIDITY OF ISOTHERMAL ANALYSIS IN ESTIMATING THE THERMAL PERFORMANCE OF STIRLING ENGINE AND CRYOCOOLER

2021 ◽  
Vol 21 (4) ◽  
pp. 274-288
Author(s):  
Hailaa Jabbar Kareem ◽  
Ali A. F. Al-Hamadani ◽  
Ali Noaman Ibrahim
Keyword(s):  
Heat Exchangers ◽  
Heat Engine ◽  
Engine Performance ◽  
Thermodynamic Cycle ◽  
Low Noise ◽  
Stirling Engine ◽  
Isothermal Model ◽  
Working Space ◽  
Isothermal Analysis ◽  
Noise Vibration

The Stirling engine is an external heat engine, which is considered as the best option for extracting work from concentrated solar power applications. The most prominent characteristics of the engine are low noise, vibration, and emissions besides reflexivity of usage with any kind of heat source such as solar, biomass, industrial heat, etc. In the present paper, the STE-1008 gamma-type Stirling engine had been analyzed by using an isothermal model to demonstrate the failure of the model in analyzing the STE-1008 considering it firstly as an engine and secondly as a cryocooler. The energy equation had been used to demonstrate the disability of the isothermal model in achieving a successful thermal analysis for engine performance. In addition, a MATLAB code had been developed to check the credibility of the isothermal model in the estimation of the engine thermal parameters. The findings of the isothermal analysis revealed that the heat exchangers are unnecessary. But, in reality; all the necessary heat transfer occur within the heat exchangers rather than in the working space boundaries. Therefore, that is invalid conclusion. However, Schmidt's theory is capable of capturing the essential engine features superbly. In particular, it is capable of capturing the fundamental interplay between the mechanically restricted movement of the engine components as well as the thermodynamic cycle which is obtained from this theory.

scholarly journals Durability Investigation of plastic gears

2019 ◽  
Vol 287 ◽  
pp. 02003
Author(s):  
Gorazd Hlebanja ◽  
Matija Hriberšek ◽  
Miha Erjavec ◽  
Simon Kulovec
Keyword(s):  
Power Transmission ◽  
Low Noise ◽  
Testing System ◽  
Manufacturing Cost ◽  
Testing Procedures ◽  
Plastic Materials ◽  
Reinforced Plastic ◽  
Noise Vibration ◽  
Plastic Gears ◽  
Lower Contact

Plastic materials can be used for various gears and gear mechanisms due to their qualities, like wear resistance when running dry, low noise, vibration damping, low inertia, low manufacturing cost, etc. However, they also expose with temperature connected problems like rapidly decreasing load, thermal expansion and accuracy of moulded gears. Therefore, it is a challenge to produce gears with adequate accuracy and durability to serve in contemporary mechatronic applications in automotive, in medical equipment and many other industries. Such materials are POM, PA6, PA66, PEEK, reinforced plastic materials, etc. and steel. Proper combination of such materials can result in long and reliable operation of such mechanisms. On the other hand, S-gears offer improved properties in comparison to involute (Egears), which essentially comprise lower contact pressure, less sliding and frictional losses, stronger root and improved oil film when lubricated. The goal is development of advanced power transmission drive components made of polymers. So, a material database, a testing system and testing procedures with varying material combinations and gear pairs according to VDI are necessary to support a designer in proper decisions. Some material properties, especially fillers are presented. Furthermore, testing facilities, gears and some results are discussed.

scholarly journals SPHERICAL ROLLER GEAR WITH DOUBLE-ROW PINION: POWER COMPUTATIONS AND PERFORMANCE COMPUTATION

2019 ◽  
Vol 2019 (5) ◽  
pp. 32-43
Author(s):  
М.Е. Лустенков ◽  
Mihail Lustenkov ◽  
Екатерина Лустенкова ◽  
:Ekaterina Lustenkova
Keyword(s):  
Power Loss ◽  
Planetary Gear ◽  
Reduction Ratio ◽  
Maximum Output ◽  
Experimental Sample ◽  
Ring Gear ◽  
Double Row ◽  
Worm Gears ◽  
And Performance ◽  
Gear Drives

The dependences of forces affecting basic elements of spherical roller gears with a double-row pinion from engagement parameters and friction coefficients are defined. The power dependences obtained allow estimating spherical roller gear (SRG) elements loading and defining optimum values of basic sphere radii and center profile amplitudes at a specified reduction ratio according to the criterion of minimum power loss in an engagement. It is defined that the performance of the SRG with the double-row pinions is comparable with the performance of planetary gear drives with two-ring gear pinions. For SRGs it depends in the inverse proportion upon a reduction ratio and increases with the increase of the roller number difference (periods of center profiles) in two rows. The SRG performance decreases considerably at friction constant increase as in worm gears. The analysis carried out confirmed the equivalence of two power circuits of gear according to the criterion of maximum output capability. The tests of the reducer experimental sample with SRG have confirmed kinematic and power dependences defined theoretically.

scholarly journals Modelling the Meshing of Cycloidal Gears

2016 ◽  
Vol 10 (2) ◽  
pp. 137-140
Author(s):  
Jerzy Nachimowicz ◽  
Stanisław Rafałowski
Keyword(s):  
Planetary Gear ◽  
Reduction Ratio ◽  
Ring Gear ◽  
Full Profile ◽  
Gear Drives ◽  
Roller Radius

Abstract Cycloidal drives belong to the group of planetary gear drives. The article presents the process of modelling a cycloidal gear. The full profile of the planetary gear is determined from the following parameters: ratio of the drive, eccentricity value, the equidistant (ring gear roller radius), epicycloid reduction ratio, roller placement diameter in the ring gear. Joong-Ho Shin’s and Soon-Man Kwon’s article (Shin and Know, 2006) was used to determine the profile outline of the cycloidal planetary gear lobes. The result was a scatter chart with smooth lines and markers, presenting the full outline of the cycloidal gear.

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