Pressure angle

About: Pressure angle is a research topic. Over the lifetime, 1373 publications have been published within this topic receiving 10245 citations. The topic is also known as: angle of obliquity.

High pressure angle throttle valve

Abstract: The invention relates to a high pressure angle throttle valve which comprises a valve rod, a valve element assembly, a valve base, a sleeve and an angle valve body. The valve element assembly, the valve base and the sleeve are arranged in the valve body, the valve base is coaxially arranged below the sleeve, at least two longitudinal rows of throttle holes are annularly formed in the sleeve, at least part of throttle holes in part of longitudinal rows are staggered in the longitudinal direction, the lower end of the valve rod stretches into the valve body to be connected with the valve elementassembly, the number of the throttle holes to be opened is selected through up-down movement of the valve element assembly in the sleeve, sealing faces between a sealing shaft sleeve and the valve base have an angle difference of 2-5 degrees to form line seal, a coupling sleeve is in threaded connection with the valve rod, a plug pin prevents rotation, a pin hole of the valve rod is designed intoa U-shaped groove, therefore, the problem that pin hole machining precision and installation difficulty are too high is solved, and the valve rod can be moved up and down in the coupling sleeve to adjust the position. The high pressure angle throttle valve is reasonable in design, simple in structure, good in throttle effect, stable in performance, long in service life, safe, reliable, capable ofachieving high-precision adjustment and capable of cutting off media to close a fluid passage.

Axial vane rotary engines preliminary design by quasi dimensional modeling technique

Abstract: ARTICLE INFO The rotary motion engines have still potentially many advantages over the conventional reciprocating engines. But only the reciprocating engine became the dominant mechanism for engines because of the simplicity of the combustion chamber sealing mechanism. This paper describes the basic concept, design, modeling and analysis of a new rotary engine type, axial vane rotary engine. One of important component in the axial vane rotary engine is cam profile which can affect the dynamic behaviors of engine. Seven cam profiles are simulated and compared kinematically to find an optimum cam profile with minimum velocity, acceleration, jerk and pressure angle to have an axial vane rotary engine with high TBO (Time between Overhaul) with respect to conventional type. In addition, a two-zone, quasi-dimensional model as a simple, fast and accurate model, is developed to simulate engine operating cycle and find the chambers pressure. The parametric modeling of an axial vane rotary engine as a prototype, including main parameters (geometrical and operating) is studied and some design considerations are investigated.

Tool for machining modified gear of ROV propeller

Abstract: The invention particularly relates to a tool for machining a modified gear of an ROV propeller. The tool comprises a tool rest and a hob arranged on the tool rest. The hob comprises a plurality of hob teeth which are arranged continuously and linearly. The tooth height of each hob tooth is 1.65 cm, the tooth dedendum of each hob tooth is 0.975 cm, the tooth addendum of each hob tooth is 0.675 cm; the tooth thickness of each hob tooth is 0.946 cm, the radius of the addendum circle of each hob tooth is 0.324 cm, the radius of the dedendum circle of each hob tooth is 0.163 cm, the tooth lead angle is 1 degree 7 minutes 18 seconds, and the rotating direction is rightward; the tooth distance between every two adjacent hob teeth is 1.885 cm; the modulus of the hob is 0.6, the number of grooves of the hob is 12, and the pressure angle is 20 degrees; the helical angle of each blade groove is 0 degree, and the blade grooves are straight groove on the aspect of the rotating direction; the base circle radius is 0.823 cm, and the base circle lead angle is 20 degrees 1 minute 49 seconds; and the modified gear of the ROV propeller is obtained through gear hobbing by means of the hob. By adoption of the technical scheme, machining and manufacturing of the modified gear of the ROV propeller can be achieved.

Statistical analysis of the influence of tooth geometry in the performance of a harmonic drive

Abstract: The objective of this research is to determine the influence of gear tooth geometrical variations in the performance of a double wave harmonic drive through statistical analysis. This work incorporates state of the art analytical and numerical models to evaluate kinematic error, load capacity, bending fatigue strength, and pitting. The geometric variables considered in this study include gear modulus, pressure angle, and tooth correction factor. The statistical analysis follows a three-level full-factorial design of experiments. Nonlinear dynamic simulation is accompanied by finite element analysis to estimate contact and bending stresses. Largest bending fatigue strength is also determined. Results demonstrate that gear modulus is the geometric parameter with prevalent influence on the kinematic error, and pitting life is rather high for all geometric variables considered.

Gear tooth surface finishing device

Abstract: PURPOSE:To improve finishing accuracy of the tooth surface of a gear to be worked by engaging the gear to be worked with a finishing master gear and rotating them together while imposing a load, and relatively reciprocating the rotation axes of both the gears in parallel. CONSTITUTION:A gear 1 to be worked and a master gear 2 are engaged with each other at an abutting part 3. The rotation of the gear 1 to be worked is transmitted to the master gear 2, and both the gears are rotated together, while a braking force acts on the axis 4 of rotation of the master gear 2 to produce a suitable face load on the abutting part 3. And the center axis 4 of the master gear 2 is reciprocated in parallel in S direction with pressure angle alpha. Thus, because the master gear 2 is rotated and simultaneously engaged with the gear 1 while imposing the face load on the abutting part 3 and reciprocated along X direction with pressure angle alpha, the finishing accuracy of the abutting part of the gear 1 to be worked is substantially improved.