公开(公告)号：US5800151A

公开(公告)日：1998-09-01

申请号：US922553

申请日：1997-09-03

Applicant: Takeshi Kawamura ,  Kiyoshi Yanagisawa ,  Shigeyoshi Nagata

Inventor： Takeshi Kawamura ,  Kiyoshi Yanagisawa ,  Shigeyoshi Nagata

IPC: F01D1/38 ,  F01C1/08 ,  F04C18/16 ,  F04C25/02 ,  F04C29/00 ,  F01C1/16

CPC classification number: F01C1/084 ,  F05B2200/261 ,  Y10T29/49242

Abstract: The transverse tooth profile of a screw rotor which meshes with a companion screw rotor is defined by a tooth root circular arc, an outer circumferential circular arc, and two curves interconnecting the tooth root circular arc and the outer circumferential circular arc. One of the curves is defined by a trochoid curve generated by a point on an outer circumferential surface of the companion screw rotor. Alternatively, the curve may comprise two curve segments, and one of the two curve segments comprising a tooth tip arc which is defined as an arc having a radius of curvature equal to or smaller than the difference between a radius of curvature of the outer circumferential circular arc and a radius of a pitch circle of the tooth profile, and the other of the two curve segments comprising a curve connected to the tooth root circular arc and determined by a curve generated by the tooth tip arc of the companion screw rotor. The other curve is defined by determining a curve which defines an imaginary rack and thereafter producing a tooth profile curve generated by the imaginary rack.

Abstract translation: 与配对螺杆转子啮合的螺杆转子的横向齿廓由齿根圆弧，外周圆弧和将牙根圆弧与外周圆弧相互连接的两条曲线限定。 曲线中的一条由伴随螺旋转子的外圆周表面上的点产生的次摆线​​定义。 或者，曲线可以包括两个曲线段，并且两个曲线段中的一个包括齿顶弧形，其被定义为具有等于或小于外周圆周的曲率半径之间的差的弧的弧形 圆弧和齿廓的节圆的半径，并且两个曲线段中的另一个包括连接到齿根圆弧的曲线，并且由伴随螺旋转子的齿顶弧产生的曲线确定。 另一条曲线是通过确定一条曲线来定义的，该曲线限定一个虚拟齿条，然后产生由虚架产生的齿形曲线。

公开(公告)号：US4971487A

公开(公告)日：1990-11-20

申请号：US347728

申请日：1989-05-05

Applicant: Shigeyoshi Nagata

Inventor： Shigeyoshi Nagata

IPC: B23F21/00 ,  B23F21/16

CPC classification number: B23F21/00 ,  B23F21/16 ,  Y10T407/173 ,  Y10T409/101749

Abstract: A method for simultaneously cutting and chamfering involute gears. The pressure angle .alpha..sub.1 and module M of the teeth of a hob for cutting the teeth are selected with respect to the nominal pressure angle .alpha..sub.0 and nominal module m of the gear to be cut according to the following equation: m cos .alpha..sub.0 =M cos .alpha..sub.1. According to the present invention, a single hob cutter is sufficient to cut gears having a wide range of numbers of teeth.

公开(公告)号：US4224015A

公开(公告)日：1980-09-23

申请号：US869031

申请日：1978-01-06

Applicant: Shigeyoshi Nagata

Inventor： Shigeyoshi Nagata

IPC: G01F3/10 ,  F01C1/16

CPC classification number: G01F3/10

Abstract: The present invention relates to a positive displacement flow meter having a pair of rotors to be rotatably engaged with each other which are provided with tooth profile curves of a cycloid and of a trochoid.Since the tooth profile of one rotor is equal to that of the other rotor, transmission of energy between the two rotors is uniform, and wear of teeth of the two rotors being reduced.

Abstract translation: 本发明涉及一种具有一对可转动地接合的转子的容积式流量计，其具有摆线和摆线的齿廓曲线。 由于一个转子的齿廓等于另一个转子的齿廓，所以两个转子之间的能量传递是均匀的，并且两个转子的齿的磨损减小。

公开(公告)号：US5697772A

公开(公告)日：1997-12-16

申请号：US626959

申请日：1996-04-03

Applicant: Takeshi Kawamura ,  Kiyoshi Yanagisawa ,  Shigeyoshi Nagata

Inventor： Takeshi Kawamura ,  Kiyoshi Yanagisawa ,  Shigeyoshi Nagata

IPC: F01D1/38 ,  F01C1/08 ,  F04C18/16 ,  F04C25/02 ,  F04C29/00 ,  F01C1/16

CPC classification number: F01C1/084 ,  F05B2200/261 ,  Y10T29/49242

Abstract: The transverse tooth profile of a screw rotor which meshes with a companion screw rotor is defined by a tooth root circular arc, an outer circumferential circular arc, and two curves interconnecting the tooth root circular arc and the outer circumferential circular arc. One of the curves is defined by a trochoid curve generated by a point on an outer circumferential surface of the companion screw rotor. Alternatively, the curve may comprise two curve segments, and one of the two curve segments comprising a tooth tip arc which is defined as an arc having a radius of curvature equal to or smaller than the difference between a radius of curvature of the outer circumferential circular arc and a radius of a pitch circle of the tooth profile, and the other of the two curve segments comprising a curve connected to the tooth root circular arc and determined by a curve generated by the tooth tip arc of the companion screw rotor. The other curve is defined by determining a curve which defines an imaginary rack and thereafter producing a tooth profile curve generated by the imaginary rack.

Abstract translation: 与配对螺杆转子啮合的螺杆转子的横向齿廓由齿根圆弧，外周圆弧和将牙根圆弧与外周圆弧相互连接的两条曲线限定。 曲线中的一条由伴随螺旋转子的外圆周表面上的点产生的次摆线​​定义。 或者，曲线可以包括两个曲线段，并且两个曲线段中的一个包括齿顶弧形，其被限定为具有等于或小于外周圆弧的曲率半径之间的差的弧形的弧形 圆弧和齿廓的节圆的半径，并且两个曲线段中的另一个包括连接到齿根圆弧的曲线，并且由伴随螺旋转子的齿顶弧产生的曲线确定。 另一条曲线是通过确定一条曲线来定义的，该曲线限定一个虚拟齿条，然后产生由虚架产生的齿形曲线。

公开(公告)号：US5205679A

公开(公告)日：1993-04-27

申请号：US825123

申请日：1992-01-24

Applicant: Shigeyoshi Nagata

Inventor： Shigeyoshi Nagata

IPC: B23F21/02 ,  B23F21/16 ,  B23F21/18

CPC classification number: B23F21/026 ,  B23F21/16 ,  B23F21/18 ,  Y10T407/1715 ,  Y10T409/10159 ,  Y10T409/101908

Abstract: A rotary tool for generating bevel gears, characterized in that a module m at a plane of rotation which is away from a reference point on a central axis by a distance .xi. in the axial direction is shown by an equation;m=m.sub.0 (1+.kappa..xi.)where, m.sub.0 denotes a module at the reference point and .kappa. is a constant.

公开(公告)号：US07048666B2

公开(公告)日：2006-05-23

申请号：US10668239

申请日：2003-09-24

Applicant: Shigeyoshi Nagata

Inventor： Shigeyoshi Nagata

IPC: F16G13/04

CPC classification number: F16H55/30 ,  F16G13/04

Abstract: A silent chain power transmitting apparatus has an endless link chain having a plurality of link plates (11A,11B,11C, . . . ) connected together, and sprocket wheels (20). Each of an inside flank (13) and an outside flank (14) of each link plate (11A,11B,11C, . . . ) is profiled by a circular shape of a same radius (ρ) of curvature whose individual center (d1, . . . ) of curvature is on a chain pitch line (PL). Each tooth (22) of the sprocket wheel (20) is profiled by a circular shape of the same radius(ρ) of curvature, which is meshed with corresponding inside flank (13) and outside flank (14) of each link plate (11A,11B,11C, . . . ). A power of the sprocket wheel (20) is transmitted to the link plates (11A,11B,11C, . . . ) in linear contact (or surface contact) momentarily, not in point contact.

Abstract translation: 无声链动力传递装置具有连接在一起的多个链板（11A，11B，11C ...）和链轮（20）的环形连杆链。 每个连杆板（11A，11B，11C ...）的内侧翼（13）和外侧翼（14）中的每一个都具有相同半径（rho）的圆形，其个体 曲率中心（d 1，...）位于链节线（PL）上。 链轮（20）的每个齿（22）由相同半径（rho）的圆形形状构成，其与每个链板（11）的相应的内侧面（13）和外侧面（14）啮合， A，11 B，11 C，...）。 链轮（20）的动力短暂地以线性接触（或表面接触）方式传递到链节板（11A，11B，11C ...），而不是点接触。

公开(公告)号：US4899609A

公开(公告)日：1990-02-13

申请号：US170407

申请日：1988-03-18

Applicant: Shigeyoshi Nagata

Inventor： Shigeyoshi Nagata

IPC: F16H55/00 ,  F16H55/08

CPC classification number: F16H55/0806 ,  F16H55/0826 ,  Y10T74/19972

Abstract: The gears according to the present invention have a unique tooth-profile in which the radius of curvature repeatedly increases and decreases from the pitch line in the direction of addendum and deddendum of a tooth without monotonously changing, and at the point where the relative of curvature is minimum, the center of the radius of curvature is positioned on the pitch line. Specifically, the curvature of the tooth-profile curve is a function which is not monotonously varied, is continuous and is capable of being differentiated, and a locus of the center of curvature forms a series of continuous curves which exist near the pitch circle. Forming the tooth-profile thus enables the relative of curvature to be brought from the value in the involute gear near that of a Wildhaver-Novikov type, with the contact interval being more than one. Also, the operating pressure angle is decreased to prevent the increase in the surface pressure and the bearing stress, and the relative of curvature between the tooth-surfaces of the gears is maintained at a lower level than the conventional one, markedly increasing the strength of the tooth-profile. The present invention can also be applied to internal gears, bevel gear, etc.

公开(公告)号：US4329130A

公开(公告)日：1982-05-11

申请号：US53716

申请日：1979-07-02

Applicant: Shigeyoshi Nagata ,  Koji Hotta

Inventor： Shigeyoshi Nagata ,  Koji Hotta

IPC: G01F3/10 ,  F01C1/16

CPC classification number: G01F3/10

Abstract: This invention relates to a positive displacement flow meter with helical toothed rotors, in which respective tooth profiles are continuously contacted with each other in order not to cause any blockage of fluid between the respective tooth profile curves. The flow meter has a pair of helical toothed rotors which are rotatable each other with no pulsation and the tooth-to-tooth surface contact pressure is maintained zero. Each of the two rotors has the same profile and the same size. Further, a plurality of curved projections can be mounted on a tooth profile of each rotor.

Abstract translation: 本发明涉及一种具有螺旋齿形转子的正排量流量计，其中相应的齿廓彼此连续接触，以便不会在相应的齿形曲线之间导致流体的任何堵塞。 流量计具有一对螺旋状的齿形转子，它们无脉动地相互旋转并且齿 - 齿表面的接触压力保持为零。 两个转子中的每一个具有相同的轮廓和相同的尺寸。 此外，多个弯曲突起可以安装在每个转子的齿廓上。