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.

Influence of Toothed Rail Parameters on Impact Vibration Meshing of Mountainous Self-Propelled Electric Monorail Transporter.

Abstract: In order to reduce the vibration of mountain self-propelled electric monorail transporters (MSEMT) caused by the impact of the meshing of roller gear with toothed rail (MRGTR), and to improve the stability and safety of monorail transporters, this paper theoretically analyzed the MRGTR mechanism of toothed monorail transporters as well as established the MSEMT displacement model and its instantaneous velocity model. The vibration signals of MSEMT with four different parameters of toothed rail were collected by the acceleration sensor and signal acquisition system. The signals were analyzed by the Hilbert envelope demodulation method to investigate the influence of toothed rail parameters on meshing impact vibration. Moreover, taking the vibration acceleration amplitude of MSEMT and the vibration attenuation time of meshing impact as evaluation indexes, a test based on the three-factor and two-level orthogonal test was engaged with factors of toothed rail pressure angle, the ratio of L-the chord length of two adjacent roller centers of a roller gear-and rack pitch p (wheel-tooth ratio) and the load mass of the MSEMT. It showed that the impact of MRGTR was the main excitation source of the vibration of MSEMT. The pressure angle and wheel-tooth ratio both have a significant impact on the smooth operation of MSEMT, the latter to a greater extent. So did the interaction between wheel-tooth ratio and load mass. The amplitude of the characteristic frequency of the MSEMT decreased with the growth of the pressure angle. When the wheel-tooth ratio was cosα, the number of the characteristic frequency was less than that when it was 1, and the amplitude became smaller too. When the pressure angle was 15, the amplitude of vibration acceleration characteristic frequency decreased as a consequence of load mass increasing. At the pressure angle of 25, the amplitude of characteristic frequency decreased with the increase of load mass if the wheel-tooth ratio was 1, and the opposite result occurs in the case when the wheel-tooth ratio was cosα. This paper provides a theoretical basis and reference for improving the impact vibration of MRGTR and optimizing the design of the toothed rail.

Effect of Standard Pressure Angle on the Bending Fatigue Strength of Helical Gears

Abstract: This paper presents a study on the effect of standard pressure angle on the bending fatigue strength of helical gears. The root stresses of meshing helical gears with various pressure angles, helix angles and whole tooth depths were calculated by using the approximate equations for deflection and bending moment due to a concentrated load on gear teeth of full depth and long teeth with various pressure angles and Kubo and Umezawa's method. Bending fatigue tests were performed on helical gears of full depth teeth with various pressure angles and helix angles. On the basis of these results, the effects of pressure angle, helix angle, and whole tooth depth on the root stresses and bending fatigue strength of helical gears were clarified to a considerable extent.

Method of correcting process tolerance of gear grinder

Abstract: PROBLEM TO BE SOLVED: To correct a helix angle without changing a pressure angle of a workpiece, by using a simple method without correcting a shape of a dresser.SOLUTION: A correction value of a phase between a vertical axis of a work table and a central axis of a grindstone is obtained from an error of a helix angle, and a gear shape is predicted in the case that a grindstone shape is changed according to a grindstone molding condition in which Y-direction feeding of a screw-like grindstone is corrected in accordance with the correction phase, and then an error of a pressure angle of a tooth surface in that case is estimated, and a pressure angle amount to be corrected, when a feed angle between a dresser rotational axis and a grindstone central axis is shifted before correction, is predicted in order to calculate a correction angle, and after correcting the screw-like grindstone by using a dresser in a posture that the feed angle is corrected only by the calculated correction angle, a workpiece is ground.SELECTED DRAWING: Figure 5

Tooth Profile of an Involute Gear

Abstract: In general, the tooth profile of a rack may be curved, and the profile angle \(\phi^{\rm A_r}\) would then vary from one point of the tooth to another We now consider a particular rack, in which the teeth are straight-sided This is the basic rack which we use to define the tooth shape of an involute gear The profile angle for this rack is constant, and the value of the constant will be represented by the symbol Φr, which is called the pressure angle of the basic rack Thus, for the basic rack used to define involute tooth profiles,

Crank connecting rod transmission type hydraulic pump with linear motor

Abstract: The invention discloses a crank connecting rod transmission type hydraulic pump with a linear motor. The crank connecting rod transmission type hydraulic pump comprises at least one plunger piston which is movably arranged in a cavity. The crank connecting rod transmission type hydraulic pump is characterized by further comprising the linear motor, at least one rack is arranged on the motor secondary level of the linear motor, and at least one gear is meshed with the rack; the plunger piston is connected to the eccentric position of the gear through a hinged rod, and the hinged rod is hinged to the gear and the plunger piston. According to the crank connecting rod transmission type hydraulic pump with the linear motor, a crank connecting rod mechanism is fully utilized, when the transmission angle and the pressure angle are large, the crank connecting rod mechanism is a stroke amplifying mechanism, and the hydraulic pump can output low-pressure and high-flow liquid, and when the transmission angle and the pressure angle are small, the crank connecting rod mechanism is a force amplifying mechanism, and the hydraulic pump can output high-pressure and small-flow liquid.