Abstract:
A phase adjustment unit (100) for effecting phase adjustment between rolls of a multi-color printing press comprises a phase adjustment gear device (10) and a phase adjustment motor (6) fitted to the rear end of the gear device (10). The phase adjustment gear device (10) includes a hollow input shaft (12) inside a hollow casing (11) and an output shaft (14) inside the input shaft (12), and spline shafts (121, 141) for fitting are disposed at the distal ends of these shafts (12, 14). Cup type first and second wave motion gear devices (16, 25) are coaxially disposed at the rear end of the spline shafts, and input rotation returns to the first wave motion gear device (16) from an inner gear (161) of the first wave motion gear device through a gear train (30) and the second wave motion gear device (25), and is transmitted to the output shaft (14). While the motor (6) is locked, each constituent element of the first wave motion gear device rotates integrally, and the input and output shafts rotate in the same way. At the time of phase adjustment, the rotation speed of the motor (6) is drastically reduced and outputted through the gear devices (25, 16). Since the input and output shafts protrude from one of the sides, fitting and removal of the unit can be conducted easily.
Abstract:
An object of this invention is to provide a flexible meshing type gear having improved retaining force for lubricating oil film between gear surfaces. In a flexible meshing type gear (1), a flexture amount (w) in a radial direction of a cross section normal to a reference axis set at a predetermined position along a tooth trace of a flexible external gear (3) thereof is made a negative deflection flexture amount which is smaller than a normal flexture amount (wo), and a rigid internal gear (2) and the flexible external gear (3) are each constituted by a spur gear. The number of teeth of the flexible external gear (3) is made smaller by 2n (n is a positive integer) than that of the rigid internal gear (2). The working tooth profile of one of these two gears (2, 3) is formed into a convex curve, and the configuration thereof is made such that a portion (L1(O, A)) belonging to a convex relative to the other gear of the top portion of a moving path (L1) by a rack approximation drawn by the teeth thereof relative to the other gear on the cross section normal to the reference axis of the tooth trace is formed into a convex curve (L2(O, B)) which is similarity transformed using an extension ratio ( lambda ) with the apex of the moving path as an origin or a similarity curve thereof, while the working tooth profile of the other gear is formed into a concave curve, and the configuration thereof is also formed into a concave curve (L3(O, C)) resulting from similarity transforming of a portion of a moving path which is identical to that portion of the one of the two gears using an extension ratio ( lambda +1) with the apex of the moving path as an origin, whereby the meshing between the two gears is made an over-running type meshing in which continuous contact is made possible at a cross section normal to the reference axis.
Abstract:
An angular acceleration detector (10) is provided with two slit-carrying discs (14, 15) mounted fixedly and coaxially in an opposed state on a rotary body (13), and a semiconductor position detecting unit (19) formed as a detecting means and consisting of a light emitting element (20) and a semiconductor position detecting member (21) which are disposed in an opposed state across the slits in these discs, the angular acceleration of the rotary body being detected by using this detecting unit. The slits (17) in the disc (15) cross at a predetermined angle the slits (16) in the disc (14). The disc (15) has an annular weight portion (15b) at the radially outer side of a slit-formed portion thereof, and a resiliently deformable spring portion (15c) circumferentially arranged at the inner side of the weight portion. The angular acceleration of the rotary body can be measured by detecting the movement of the crossing portions of the slits relatively moving due to the inertial force of the weight portion.
Abstract:
A detecting device (1) is provided with first and second discs (6 and 7) fixed to a rotating shaft (2). In the first disc (6), a first slit row (8) and a slit row (9) for encoder are formed as a common slit row (10). In the second disc (7), a second slit row (12) is formed. The light emitted from a photosensor (13) is led by an optical fiber cable (135) through the first and second slit rows (8 and 12). The angular acceleration of the rotating shaft (2) is detected from the relative movement between the slits. An encoder (14) detects the angle of the shaft (2) by detecting the movement of the slit row (9). Since the light wave guide of the photosensor (13) is formed of an optical fiber, the two discs (6 and 7) can be attached to arbitrary positions. In addition, since the slits are commonly used, the manufacture of an optical rotational information detecting device becomes easier. Therefore, a small-sized compact rotational information detecting device having a high degree of freedom in design can be manufactured inexpensively.
Abstract:
A silk hat flexible engagement gear device (1) has first and second end plates (2 and 3) and an input shaft (4) is rotatably supported, with their ends supported, between the two end plates. A cylindrical body part (61) of a silk hat flexible external gear (6) is disposed on the outer circumference of the input shaft (4). A cross roller bearing (8) which also functions as a device housing and a rigid internal gear (5) are provided on the outer circumference. An annular boss (64) of the flexible external gear is held between the outer ring (81) of the cross roller bearing and the second end plate (3) and these three members are coupled with each other with second fixing bolts (9). The rigid internal gear (5) is held between the inner ring (82) of the cross roller bearing and the first end plate (2) and these three members are coupled with each other with first fixing bolts (11). An additional member which is used as a device housing is not necessary. The members are temporarily fixed and fastened and, further, attached to a housing on the motor side or on the load side with the fixing bolts (9 and 11) only. Therefore, the number of components of the device can be reduced and the size of the device can be reduced.
Abstract:
A meshing type gear device designed to improve further its strength and wear resistance, and more particularly to improve the wear resistance of the tooth surface. In a meshing type gear device (1), a spur gear is used both for a rigid internal gear (2) and a flexible external gear (3), and the number of teeth of the flexible external gear (3) is made greater by two than that of the rigid internal gear (2). The tooth profile of the flexible external gear (3) is formed into a convex tooth profile which is in the form of a curve AC that is to be obtained through similar transformation at a reduction ratio lambda of a convex portion (a curve between A and B) relative to the internal gear of a moving path L by rack approximation drawn by the external gear relative to the internal gear with a limiting point A of the contact between the two gears on the path serving as an origin, while the tooth profile of the rigid internal gear (2) is formed into a concave tooth profile which is in the form of a curve AD that is to be obtained through similar transformation at an enlargement ratio (1 + lambda ) of the same convex portion relative to the internal gear of the moving path with the limiting point A of the contact serving as an origin, whereby a continuously contactable and passing meshing can be produced between the two tooth profiles. With this configuration, it is possible to remarkably increase the capability of maintaining a lubricating oil film between the tooth surfaces and remarkably improve the permissible delivered torque of the flexible meshing type gear device based on the tooth surface wear.
Abstract:
In a deflection mesh type gear (1), basic tooth addendum profiles of a rigid internal gear (2) and a flexible external gear (3) are obtained from the formulas (1) and (2) where m is the tooth module, Zc is the number of teeth of the rigid internal gear (2), ZF, hfF, t and rn are the number of teeth, dedendum, rim thickness at the bottom, radius of the neutral circle of the rim of the flexible external gear (3), respectively, tau is the tooth thickness increase coefficient of both the rigid internal gear (2) and the flexible external gear (3), eta is the supplementary angle variable, and where the datum line is taken as x axis, the center line of tooth profile is taken as y axis, + sign of the composite sign in the formula (1) is for the flexible outer gear (3) and - sign is for the rigid internal gear (2). Formula (1) is x = m[0.25{ pi - n( eta - sin eta )} - (+/- tau )] - 0.5(g1 - g2); Formula (2) is y = 0.5mn(1 - cos eta ), where g1 = (0.5t + hfF + mn - f)[tan {2mn.sin eta / (rn + 2mn.cos eta )} + epsilon ]; g2 = 0.5mn ( eta - sin eta ) - xN + {yN - mn(1 - cos eta )}.0.5tan(0.5 eta ); f = 0.5m[n(1 + cos eta + tan(0.5 eta ){0.25( pi - n( eta - sin eta )) - tau }]; theta = 0.5 eta - (0.5mn/rn)sin eta + (0.5mn/rn) sin(2 eta ); epsilon = theta - 0.5 eta ZF/Zc; xN = (rn + mn.cos(2 theta ))sin epsilon ; yN = rn + mn - {rn + mn.cos(2 theta )}cos epsilon . Such a tooth profile realizes a proper wide-range engagement of teeth can be proposed for a tooth profile of rack approximation in consideration of tooth inclination and variation of locus of movement of the origin of the coordinate system for a tooth profile.
Abstract translation:在偏转网状齿轮(1)中,从公式(1)和(2)获得刚性内齿轮(2)和柔性外齿轮(3)的基牙齿形轮廓,其中m是齿模块,Zc 是刚性内齿轮(2)的齿数,ZF,hfF,t和rn是齿数,齿根,底部的边缘厚度,柔性外齿轮边缘的中性圆的半径(3 ),tau是刚性内齿轮(2)和柔性外齿轮(3)两者的齿厚增加系数,eta是辅助角度变量,其中基准线作为x轴,中心线 将齿廓作为y轴,公式(1)中的复合符号的+符号用于柔性外齿轮(3),符号用于刚性内齿轮(2)。 公式(1)是x = m [0.25 {pi-n(eta-sin eta)} - (+/- tau)] -0.5(g1-g2); 公式(2)是y = 0.5mn(1-cos eta),其中g1 =(0.5t + hfF + mn-f)[tan -1] {2mnsinsin eta /(rn + 2mn.cos eta)} +ε g2 = 0.5mn(eta-sin eta)-xN + {yN-mn(1-cos eta)}。0.5tan(0.5 eta); f = 0.5m [n(1 + cos eta + tan(0.5 eta){0.25(pi-n(eta-sin eta))-τ}];θ= 0.5 eta - (0.5mn / rn)sin eta + sin(2 eta);ε=θ-0.5 eta ZF / Zc; xN =(rn + mn.cos(2θ))sinε; yN = rn + mn- {rn + mn 考虑到齿的倾斜和坐标原点的运动轨迹的变化,可以提出这种齿廓实现齿的适当的宽范围啮合的齿廓近似的齿廓 齿廓系统
Abstract:
A flat wave-motion gear (1) which has an input shaft (4) supported rotatably at both end portions thereof between first and second end plates (2, 3). A wave-motion gear mechanism is incorporated between these end plates (2, 3), and a cross roller bearing (8) is provided on an outer circumferential side of the wave-motion gear mechanism. The wave-motion gear mechanism comprises a rigid internal gear (5), a silk hat-shaped flexible external gear (6) provided on the inner side of the internal gear, and an intermittent driving force generator (7) provided on the inner side of the external gear (6). An annular boss (64) of the flexible external gear is held between an outer race (81) of the cross roller bearing (8) and the second end plate (3), whereby these three members are fastened to one another. The rigid internal gear (5) is held between an inner race (82) of the cross roller bearing (8) and the first end plate (2) whereby these three members are fastened to one another. The input shaft (4) may comprise a hollow shaft. Owing to the employment of such a structure, the apparatus as a whole can be formed flat and to a length slightly larger than the axial length of the flexible external gear. Since the outer race of the cross roller bearing can be used also as a housing of the apparatus, the apparatus can be formed compactly by a reduced number of parts.
Abstract:
A silk hat type flexible external gear (13) of a flexible mesh engagement gear device (11) comprises a barrel portion (22), a diaphragm portion (23) and a boss portion (25). A thin portion (221) whose thickness is 80 % of the thickness of a main body portion of the barrel portion (22) is formed between the main body portion and a curved portion (222). The thickness of the diaphragm portion (23) is set such that it is the maximum at its internal circumferential end portion (point A), the minimum at its central portion (point B) and a slightly thinner than the maximum thickness at an external circumferential end portion (point C). The contour of the diaphragm is determined by using a group of curves (223, 224) such that the change in thickness is smooth as a whole. It is possible to ease the concentration of stress at the internal and external circumferential end portions so as to realize a gentle stress distribution by disposing the thin portion (221) in a way as described above and determining the thickness of the diaphragm portion (23) also in a way as described above. Consequently, it is possible to realize a silk hat type flexible mesh engagement gear device having a shorter axial length and a smaller outside diameter.
Abstract:
In cup-shaped flexing contact gears (1), the respective tooth profiles of the rigid internal gear (2) and the cup-shaped flexible external gear (3) are each constructed such that the tooth face portion is formed of a straight line MA disposed in the vicinity of a datum point, a first convex circular arc AB smoothly connected thereto and a second convex circular arc BC smoothly connected to the first convex circular arc AB and having a radius of curvature larger than the first convex circular arc, while, the dedendum portion excluding the root is created by a standard rack consisting of a tooth profile formed by a curve point-symmetrical with respect to the datum point to the tooth profile at the tooth face or a curve obtained by correcting the above-mentioned curve. The curve defined by the above-described first and second convex circular arcs is an approximated curve of a similar curve obtained by subjecting to the conversion of similitude of 1/2 in the reduction ratio from the marginal point of intermeshing, which is selected on a composite curve to be described hereunder, this composite curve obtained by connecting a moving locus of teeth of the flexible external gear in a section of rotation in the vicinity of the end portion of the tooth trace on the side of a diaphragm to an envelope of moving loci obtained by overlapping on one plane of rotation the moving loci obtained by rack approximation of the external gear to the rigid internal gear in sections of rotation at the respective positions in the direction of tooth trace of the cup-shaped flexible external gear.