公开(公告)号：US6146253A

公开(公告)日：2000-11-14

申请号：US844469

申请日：1997-04-18

Applicant: Faydor L. Litvin ,  Yih-Jen Chen ,  Gregory F. Heath ,  Vijay J. Sheth ,  Ningxin Chen

Inventor： Faydor L. Litvin ,  Yih-Jen Chen ,  Gregory F. Heath ,  Vijay J. Sheth ,  Ningxin Chen

IPC: B23F23/12 ,  B24B53/075 ,  B24B1/00

CPC classification number: B23F15/06 ,  B23F23/1225 ,  B24B53/075

Abstract: A precision grinding apparatus includes a grinding worm for precision grinding a case-hardened face gear. A shaper is first placed into contact with a face gear, to thereby shape a surface of the face gear into a plurality of face gear teeth. The shaper is then removed, and the face gear is case hardened. The grinding worm is disposed in a normal orientation to the case-hardened face gear and includes a spiral tooth extending along a perimeter of the grinding worm. The spiral tooth of the grinding worm is adapted to contact and precision grind the case-hardened gear. A dressing tool includes a protrusion for contacting the spiral tooth of the grinding worm, as the spiral tooth contacts and precision grinds the case-hardened face gear. The dressing tool thus maintains the shape of the grinding worm to within a desired tolerance range.

Abstract translation: 精密磨削装置包括用于精加工表面硬化面齿轮的研磨蜗杆。 首先将成形器与面齿轮接触，从而将面齿轮的表面成形为多个齿轮齿。 然后取下整形器，并且表面齿轮表面硬化。 研磨蜗杆以正常的方向设置在表面硬化面齿轮上，并且包括沿研磨蜗杆的周边延伸的螺旋齿。 研磨蜗杆的螺旋齿适用于接触和精密磨削硬化齿轮。 修整工具包括用于接触研磨蜗杆的螺旋齿的突起，因为螺旋齿接触并精密研磨表面硬化面齿轮。 因此，修整工具将研磨蜗杆的形状保持在所需的公差范围内。

公开(公告)号：US6128969A

公开(公告)日：2000-10-10

申请号：US76691

申请日：1998-05-12

Applicant: Faydor L. Litvin ,  Aleksandar Egelja ,  Inhwan Seol

Inventor： Faydor L. Litvin ,  Aleksandar Egelja ,  Inhwan Seol

IPC: F16H1/16 ,  F16H1/12 ,  F16H55/08 ,  F16H55/22

CPC classification number: F16H1/125 ,  F16H55/082 ,  Y10T74/1966 ,  Y10T74/19828 ,  Y10T74/19953 ,  Y10T74/19972

Abstract: A hybrid gear drive suitable for the transformation of motion and power between an involute worm and a face gear wherein the axis of the face gear and the worm may be crossed or intersected. The gear drive includes a multi-thread involute worm in meshing engagement with a face gear having helical teeth. The multi-thread involute worm threads each have a driving surface and a coasting surface formed in the profiles of the involutes of a pair of base circles having different radii. The gear drive allows practical gear ratios up to about ten for high speed, high load applications such as helicopter or automobile gearboxes.

Abstract translation: 一种混合齿轮传动装置，其适用于渐开线蜗杆与面齿轮之间的运动和动力转换，其中面齿轮和蜗杆的轴线可能交叉或相交。 齿轮传动装置包括与具有螺旋齿的平面齿轮啮合的多螺纹渐开线蜗杆。 多螺纹渐开线蜗杆各自具有形成在具有不同半径的一对基圆的渐开线的轮廓中的驱动表面和滑行表面。 齿轮传动装置允许高速，高负载应用（如直升机或汽车变速箱）的实际齿轮比高达约十。

公开(公告)号：US07191521B2

公开(公告)日：2007-03-20

申请号：US10360290

申请日：2003-02-07

Applicant: Faydor L. Litvin ,  Xiangshun Zhao ,  John Sofia ,  Theresa Barrett

Inventor： Faydor L. Litvin ,  Xiangshun Zhao ,  John Sofia ,  Theresa Barrett

IPC: F16H55/08

CPC classification number: B21K1/30 ,  F16H55/0853 ,  F16H55/0886 ,  Y10T29/49467 ,  Y10T74/19949 ,  Y10T74/19972

Abstract: The present invention provides for bevel gears having a localized and stable bearing contact. The localization of bearing contact is achieved by substitution of flat tooth surfaces with parabolic tooth surfaces. This is accomplished by either modifying line-contact directly or by using a generating parabolic cylinder during generation of the tooth surfaces. The actual contact area is spread over an ellipse centered around an instantaneous theoretical point of contact at the apex of the parabolic tooth surface. This localized bearing contact reduces the shift of the bearing due to assembly and manufacturing errors, thereby providing a more durable and quieter gear. Furthermore, the geometry of the gear enables creation of dies from which the gear may be forged. Transmission errors are modeled using a pre-designed parabolic function that coincides with the parabolic tooth surface design of the present invention.

Abstract translation: 本发明提供了具有局部和稳定的轴承接触的锥齿轮。 轴承接触的定位是通过用抛物面齿表面代替平齿表面实现的。 这可以通过直接修改线接触或者在牙齿表面的产生期间使用产生抛物线的圆柱来实现。 实际的接触面积分布在以抛物面齿面顶点的瞬时理论接触点为中心的椭圆上。 这种局部轴承接触减少了由于组装和制造误差导致的轴承偏移，从而提供了更耐用和更安静的齿轮。 此外，齿轮的几何形状能够形成可以锻造齿轮的模具。 使用与本发明的抛物面齿面设计一致的预先设计的抛物线函数建模传输误差。

公开(公告)号：US06205879B1

公开(公告)日：2001-03-27

申请号：US09340824

申请日：1999-06-28

Applicant: Faydor L. Litvin ,  Pin Hao Feng ,  Sergey A Lagutin ,  Dennis P Townsend ,  Thomas M Sep

Inventor： Faydor L. Litvin ,  Pin Hao Feng ,  Sergey A Lagutin ,  Dennis P Townsend ,  Thomas M Sep

IPC: F16H5508

CPC classification number: F16H55/088 ,  B23F9/025 ,  F16H55/0806 ,  Y10T74/19949 ,  Y10T74/19953 ,  Y10T74/19972 ,  Y10T409/101431 ,  Y10T409/104929

Abstract: Helical or spur gear drive comprising a driven gear and driving gear wherein the driving gear has double crowned teeth defined as (i) an envelope to a family of surfaces generated by a skew or straight rack-cutter having a parabolic tooth profile in normal section and then (ii) as an envelope to a family of tool surfaces that are generated while the tool performs a plunging motion with respect to the driving gear in the direction of the shortest distance between the axes of rotation of the tool and the driving gear and tool plunging motion is varied by a parabolic function, whose variable is displacement of the tool in a direction parallel to the rotational axis of the driving gear. The driven gear has a tooth surface defined as the envelope to a family of surfaces generated by a rack-cutter which surface is parabolic cylinder or a plane. The generated pinion/gear tooth surfaces are in theoretical point contact at every instant and they produce a preselected parabolic function of transmission errors in the process of meshing. The pinion/gear exhibit reduced vibration and noise, reduced shift of bearing contact caused by misalignment, and reduced contact stresses due to convex-concave contact of tooth surfaces.

Abstract translation: 螺旋或正齿轮传动装置包括从动齿轮和驱动齿轮，其中驱动齿轮具有双冠状齿，其定义为：（i）由正常截面具有抛物线形齿轮的倾斜或直齿条切割器产生的一系列表面的外壳，以及 然后（ii）作为工具表面系列的信封，该工具表面在工具相对于驱动齿轮沿着工具的旋转轴线与驱动齿轮和工具之间的最短距离的方向执行突出运动时产生的 突变运动由抛物线函数变化，其变量是沿着与驱动齿轮的旋转轴线平行的方向的工具的位移。 从动齿轮具有被定义为包壳的齿面，该齿面由由齿条切割器产生的一系列表面，其表面是抛物线柱体或平面。 所产生的小齿轮/齿轮齿表面在每一时刻处于理论点接触，并且在啮合过程中产生传动误差的预选抛物线函数。 小齿轮/齿轮表现出减少的振动和噪音，减小由于不对准引起的轴承接触偏移，并减少由于牙表面的凸凹接触引起的接触应力。