The invention discloses a non-full-symmetry involute gear and a machining method thereof. The non-full-symmetry involute gear is characterized in that a gear end face tooth groove tooth profile comprises an involute segment AB, an arc-shaped segment BC, a linear segment CD, an arc-shaped segment DE and an involute segment EF, AB and EF are in incomplete symmetry relative to an axis III, the axis III is the angular bisector of a central angle faced by end face tooth groove width, the point A and the point F are respectively the tooth apexes of the left tooth face and right tooth face of the end face tooth groove tooth profile, the point B is the involute starting point of the left tooth face of the end face tooth groove tooth profile, the point E is the involute starting point of the right tooth face of the end face tooth groove tooth profile, the linear segment CD is vertical to the axis III and tangent to a tooth root circle, the arc-shaped segment BC and the linear segment CD are tangent to a straight line I, and the arc-shaped segment DE is tangent to the linear segment CD and a straight line II. The machining method includes: using indexing tooth-by-tooth milling or indexing tooth-by-tooth linear cutting to machine the tooth groove of a to-be-machined part. By the machining method, the left tooth face and the right tooth face can have different tooth root bending strength.

Non-fully-symmetric involute gear and machining method therefor

The invention discloses a bilinear asymmetric toothed medium-pressure gear pump, and relates to a high-emission medium-pressure gear pump aiming at extracting a raw material with larger viscosity in the chemical engineering and petroleum industries. The bilinear asymmetric toothed medium-pressure gear pump comprises a driving shaft, a front end cover, a pump body, floating pressure side plates, a back end cover and a driven shaft, wherein the front end cover and the back end cover are respectively mounted at the front end and the back end of the pump body; the driving shaft is mounted on the pump body through the two floating pressure side plates, penetrates through a shaft hole in the front end cover, and stretches out the pump. The bilinear asymmetric toothed medium-pressure gear pump is characterized in that a bilinear asymmetric gear I and a bilinear asymmetric gear II are mounted on the driving shaft between the two floating pressure side plates; a bilinear asymmetric gear III and a bilinear asymmetric gear IV are mounted on the driven shaft. The bilinear asymmetric toothed medium-pressure gear pump has the characteristics that the structure is novel, the design is ingenious, the service life can be prolonged, the emission capacity is improved, and the noise is lower; the bilinear asymmetric toothed medium-pressure gear pump integrates the economical efficiency and the practicability as a whole.

Bilinear asymmetric toothed medium-pressure gear pump

The invention relates to an exact modeling method of a double circular arc gear. The method comprises the following steps of: S1, determining basic parameters of the double circular arc gear; S2, drawing a pitch circle, an addendum circle and a root circle of the gear; S3, drawing a circular arc curve according to an end surface tooth profile equation, and establishing a basic tooth profile; S4, duplicating and creating a plurality of gear teeth cross sections; S5, drawing a scanning curve according to a helix equation, and finishing single-tooth modeling through mixed scanning; and S6, creating a fitting model through an array order, and adding hubs to finish the gear modeling. The method has the advantages of high modeling precision and high efficiency; and the method is beneficial for improving the design and manufacturing precision of the double circular arc gear.

Exact modeling method of double circular arc gear

The invention discloses a double-involute gear. Working tooth profiles of gear teeth of the gear comprise two or three sections of smoothly connected involutes; the working tooth profile of the gear teeth at the gear top is a first involute part outwards projected; and the working tooth profile at the gear root part is a second involute part inwards recessed. The double-involute gear is strong in adaptability and excellent in exchangeability, and reduces the manufacturing difficulty thereof; and the tooth profile contact areas can be increased in use, so that the contact stress is low, the contact strength is higher, the pitting failure is not easy to be generated, and the service life can be prolonged.

Double-involute gear

The present invention relates to mechanics, and is one kind of gear with different bearing capacity for forward and reverse force transmission. The gear is suitable for force transmission with basically fixed transmission direction and occasional reverse transmission. During force transmission in the forward direction, the main operating surfaces are contacted and the main operating surfaces are in stepped double-arc tooth form with lower bending stress and higher bearing capacity compared with standard double-arc tooth form. During force transmission in reverse direction, the subsidiary operating surfaces are contacted and the subsidiary operating surfaces are in great pressure angle involute tooth form with bearing capacity lower than that of double-arc tooth form but higher standardinvolute tooth form.

Chen Shuodong

Papers

Asymmetrical tooth gear transmission composed of double arc and involute