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.

Novel sector-rack pair of rocker arm shaft of circulating ball type variable-transmission-ratio steering gear

Abstract: The invention provides a novel sector-rack pair of a rocker arm shaft of a circulating ball type variable-transmission-ratio steering gear and relates to the technical field of automobile steering gears. The novel sector-rack pair comprises a sector 1 and a rack 2, wherein the sector 1 is an involute standard sector; a curved tooth profile is adopted by the rack 2; the requirement for a variable transmission ratio of an existing steering gear is met; the involute standard sector serving as the sector 1 is determined according to the parameters including the modulus, the number of gear teeth, the pressure angle, the tip diameter, the root diameter and the sector included angle; the shape of the curved tooth profile of the rack 2 is determined according to the shape of the curved tooth profile of a forming tool for the rack 2; and the shape of the curved tooth profile of the forming tool for the rack can be obtained by solving coordinates of the curved tooth profile according to the non-circular gear engagement principle, and the forming tool is manufactured for machining the rack 2. By adoption of the novel sector-rack pair of the rocker arm shaft of the circulating ball type variable-transmission-ratio steering gear, the requirement for the variable transmission ratio of the existing steering gear is met, the machining process is simplified, the process cycle is shortened, the machining efficiency is improved, the machining precision is improved, and the comprehensive economical benefit is remarkable. The novel sector-rack pair can be applied and popularized for all enterprises producing automobile steering gears.

Optical serial printed head

Abstract: PURPOSE:To maintain a constant developing gap and obtain a favorable print free of ununiformity of development, by a construction comprising an idle gear so disposed that the direction of a contact load between it and a sleeve gear coincides with the direction of pressing a developing sleeve against a photosensitive drum. CONSTITUTION:Where a pressure angle alpha of a gear is 20 deg., an idle gear 31b is so disposed that the position of contact of a sleeve gear 34 with the idle gear 31b is deviated rightward by the pressure angle alpha of 20 deg. from a direction perpendicular to the direction in which a developing sleeve 25 is pressed against a photosensitive drum 11. With a drum gear 30 rotated clockwise, the photosensitive drum 11 is also rotated clockwise, whereas an idle gear 31a is rotated counterclockwise, and the idle gear 31b is rotated clockwise. The idle gear 31b exerts a contact load (f) on the sleeve gear 34 in a direction parallel to the direction of pressing the developing sleeve 25 against the photosensitive drum 11, from the contact position of teeth of the idle gear 31b and the sleeve gear 34.

Zoom lens zooming cam optimization method

Abstract: The present invention belongs the field of photoelectronic imaging devices, and especially relates to a zoom lens zooming cam optimization method. The problems are solved that a zoom lens zooming camis not smooth, low in zooming precision, low in speed and prone to get stuck. The method concretely comprises the steps of: 1, optical system design; 2, analysis of a cam pressure angle; 3, construction of a piecewise function for the whole cam according to a trend displayed by the cam pressure angle; and 4, analysis of focal length output precision.

System capable of keeping hydraulic pressure of secondary pressure angle of chamfering plate blank stable and using method of system

Abstract: The invention relates to a system capable of keeping hydraulic pressure of a secondary pressure angle of a chamfering plate blank stable and a using method of the system. The system comprises a hydraulic device, a hydraulic detecting device and a hydraulic controlling device, wherein the hydraulic detecting device is used for detecting the oil pressure of the hydraulic cylinder lower cavity in thehydraulic device and timely transmits the oil pressure to the hydraulic controlling device; and when the oil pressure exceeds the normal range, a computer in the hydraulic detecting device controls arelated electromagnetic switching valve to switch over between a primary hydraulic pump and a standby hydraulic pump so as to ensure that the oil pressure of the hydraulic cylinder lower cavity in the hydraulic device is kept within the normal range and to ensure that a piston pushes a side pressing roller to carry out secondary angle pressing operation on the side part of the plate blank. With adoption of the system and the using method, the straight crack defect of the steel plate sides can be avoided, and the product quality is improved; and in addition, intelligent control over hydraulicequipment is realized to the maximum, so that the labor intensity of a site worker is greatly lowered and efficient production of a site is facilitated.

Analysis of Gear Milling at Various Speeds, Time and Feed Rates

Abstract: Spur gears are the most commonly used gears for mechanical power transmission. Form-milling the tooth of involute spur gear involves specification of the cutting speed for the work piece material and feedrate of the milling cutter. The speed and feedrate selection for such cutting has a strong link with the completion period of the machining exercise, which indirectly also determines the cost of producing the gears. This paper presents a study carried out in establishing a multiple linear regression model for determining time required for form-milling an involute spur gear tooth at varying speeds and feedrates on a milling machine. Five spur gears, of 15-teeth each, with pressure angle 20 0, and module 2.8mm, were experimentally milled on a universal milling machine, while the time for the completion of each tooth at different speeds and feedrates were recorded and analyzed on the platform of SPSS 12.0, where the data were subjected to t-test, ANOVA analysis and optimality test. The model generated t = f(s,f), gave coefficients β 0 , β 1 and β 2 as 0.281, -0.005, and -0.03 respectively. The test confirmed the coefficient as being significant to the adopted model and the ANOVA analysis showed the correlation between speeds and feedrates for cutting a tooth of a spur gear. Thus, as the cutting speed and feedrate increases, cutting time reduces. The model will serve as a useful tool in preparation of cost estimate in machining of involute spur gear. http://dx.doi.org/10.4314/njt.v34i1.19