CN102252036A

CN102252036A - Spatial flexible coupling

Info

Publication number: CN102252036A
Application number: CN2011100389073A
Authority: CN
Inventors: 吴实渊; 查尔斯·伯特
Original assignee: Individual
Current assignee: Individual
Priority date: 2011-02-16
Filing date: 2011-02-16
Publication date: 2011-11-23

Abstract

The invention discloses a spatial flexible coupling, namely a spatial dynamic linked coupling. The spatial flexible coupling is used for transmitting rotating mechanical power, providing extremely low torsional rigidity so as to achieve isolation of torsional vibration and allowing an angle between a driven shaft and a driving shaft. In the system, an input flange fixed on the driving shaft is connected to coupling masses of the same number through pivots at the outer ends of a plurality of link arms with equal length; and pivots at the inner ends of the link arms are connected to the input flange through holes uniformly distributed in the circumference of the flange. The coupling masses are sequentially connected to an output flange fixed on the driven shaft through the pivots of the link arms of the same number. Spherical bearings are arranged in the connecting holes in the flanges and the coupling masses. The axes of two shafts can be placed in an acute angle, and the two shafts are not limited on the same axis. During moving, the driving shaft guides the driven shaft, so that the torque is used as tension and transmitted in the link arms. Because of the action of the spherical bearings, the link arms can adapt to the angle change of the shafts during rotating.

Description

The spatial flexible coupling

Technical field

This invention is the spatial flexible coupling about transferring power between live axle and driven shaft or other throws.The spatial flexible coupling can transmit power from low to high under high speed, and extremely low torsional stiffness is provided.More particularly, the present invention allows to exist between live axle and the driven shaft angle when transmission power.

Technical background

The invention of Georgevitch (US#1,716,225,1929) is in the ability of transfer of torque, and the angular range aspect that allows between axle and the axle all is restricted.Because the moment of torsion of transmission is a balance with the centrifugal force that acts on the link arm, in low speed, under the condition of high pulling torque, two link arm are incited somebody to action alignment at an easy rate, thereby cause the instability of system motion.On the other hand, the link arm that this invention is adopted is non-rubber-plastics material, allow very little malalignment hardly, and high stress is born at the two ends of link arm.

Nineteen fifty-nine, Dorton improves foregoing invention, has introduced coupling mass.He has used this mechanism at some centrifugation apparatus such as centrifugal compressor, centrifugal pump, fan, propeller cavitation and engine etc.After he proved and has adopted coupling mass, system can provide the ability of transmission high pulling torque.

Nineteen sixty to 1962 year, the charles. Bert has been analyzed the nonlinear characteristic of this rigidity link arm mechanism.He provides the plotted curve that concerns between link arm angle and the transmitting torque.

Alan's invention (US#4,033,144,1977) has utilized the engineering order plastic materials to bear malalignment, but they are easy to produce fatigue ruption at crooked and adstante febre.They also only can hold very low-angle axial dipole field.

The charles. first has analyzed the nonlinear characteristics of this mechanism of band elasticity link arm Bert and Wu Shiyuan (2003), has obtained the output speed of flexible coupling and the ratio of input speed fluctuation.They find, if coupling mass is too heavy, and also can't transmitting torque.They have at first invented and have analyzed the nonlinear characteristic of this mechanism of carrying space link arm.They find that this spatial flexible coupling can be applicable to be included in the VTOL aircraft under the situation that a motor breaks down, power transmission device when between input shaft and output shaft, having big malalignment, and usually have the gas-turbine, water turbine etc. of torsional vibration.

The flexible coupling of other non-rubber-plastics material types such as cardon link allow malalignment to reach more than 10 degree; But, they do not provide the low torsional stiffness that helps reduce vibration.

The invention of this spatial flexible coupling has reduced the difficulty of above pointing out, and other functions and the advantage that never obtains up to now is provided.

Summary of the invention

One of purpose of this invention provides one in big velocity range, the spatial flexible coupling of transmission high pulling torque between live axle and driven shaft or other throws.

Another purpose of this invention provides low torsional stiffness, and will reduce torsional vibration significantly.

Another purpose of this invention is to allow to exist between live axle and the driven shaft angle when transmission power, and the size of angle is determined by the ratio of shaft flange dish diameter and link arm length.

The above-mentioned purpose of this invention and other purposes are to realize by the structure of spatial flexible coupling, promptly allow coupling mass be used to hold high pulling torque transmission, and allow spherical bearing be used for holding axle with spool between angle.

Description of drawings

Fig. 1 is that the assembly of demonstration spatial flexible coupling of the present invention system launches view; Fig. 2 is the assembled view that shows spatial flexible coupling of the present invention system, and is embodied in and has about 15 degree angles between live axle and the driven shaft.

Embodiment

For the particularly initial Fig. 1 that draws, be that the live axle 11 of display space flexible coupling is connected to driven shaft 12.Coupling comprises input flange 13 that is contained on the live axle 11 and the output flange 14 that is installed on the driven shaft 12.Even cloth has the hole of three same diameter at the flange

upper periphery.Flange

13 and 14 is fixed on the

axle

11 and 12; Two

flanges

13 and 14 physical dimension are identical, and just thickness may be different.Between two

flanges

13 and 14, be three identical coupling masses 19, its location generally is parallel to axle 11 and axle 12.12 identical spherical bearings are installed on flange and the coupling mass, three spherical bearings 15 on input flange, three spherical bearings 16 on the output flange, three spherical bearings 17 in the face of on the coupling mass of input flange, three spherical bearings 18 are in the face of on the coupling mass of output flange.

Input flange 13 links to each other with coupling mass 19 by three link arm 21 of equal in length.Coupling mass 19 links to each other with output flange 14 by three link arm 22 of equal in length.Link arm 21 and 22 is identical, when when coaxial, link arm 21 and 22 is altogether on a plane perpendicular to flange shaft, and form an isosceles triangle, this isoceles triangle shape is formed (axis of link arm outer end just in time overlaps with middle coupling mass) by the distance between link arm 21 and 22 and two link arm the inners.

The inner fulcrum of link arm 21 is connected to input flange 13 by spherical bearing 15.The outer end fulcrum of link arm 21 is connected to coupling mass 19 by spherical bearing 16.Coupling mass 19 connects the outer end fulcrum that arrives link arm 22 mutually by spherical bearing 17.The inner fulcrum of link arm 22 is connected to output flange 14 by spherical bearing 18.The tie point that forms three coupling masses is symmetrically distributed in one and limits on the circumference.

Fig. 2 has illustrated a typical runnability, can see that wherein the axis of axle 11 and the axis of axle 12 are in mutual out-of-alignment position.Showing that in typical case the angle between the axis is about 15 degree.Coupling is by link arm 21 and 22, and the effect of spherical bearing 15-18 can be held such malalignment.

Can see that the angle of forming between the right link arm 21 and 22 changes, and wherein has the position of two keys in the rotary course of one 360 degree.The first, the distance between two flanges hour, the angle minimum between the paired link arm.And when the distance between two flanges is maximum, the angle maximum between the paired link arm.The position of two keys differs 180 degree on circumference.

Obviously, the angle between the paired link arm changes and will change coupling mass to the distance between the flange center.Correspondingly, in each complete cyclic process of coupling, coupling mass will periodically change to the distance between the flange center.When every distich armshaft whenever revolves three-sixth turn, coupling mass to the distance between the flange center with the variation of execution cycle property.Other paired link arm is also all the same, because the shape and size of all paired link arm and they all are identical in the assembling of coupling.

Because the effect of spherical bearing, the angle between the paired link arm changes, and coupling mass will be regulated by spherical bearing 15-18 to the variable in distance between the flange center.Spherical bearing allows any angle radial and axial in the coupling system to change.Coupling mass is adjusted to any position by three tie points on the coupling mass.

In coupling, 120 angles have formed link arm moment length relation between the adjacent link arm, and per 120 degree of this relation repeat once.In other words, give coupling mass a slightly periodic center displacement, the frequency of coupling mass is three times in the speed of coupling.Yet, because link arm 21 and 22 with input flange 13 between tie point corresponding to link arm 21 and 22 with output flange 14 between tie point, coupling mass and flange center between variable in distance mutual additional consistent, therefore, exist normal speed relation between live axle 11 and the driven shaft 12.

Claims

The spatial flexible coupling be used for connecting live axle and driven shaft, transferring power, absorption torsional vibration and hold the axle with spool between angle, form by following: 1 input flange that is fixed on the above-mentioned live axle; 1 output flange that is fixed on the above-mentioned driven shaft; Link arm more than 3 pairs is arranged symmetrically by the flange axis; The coupling mass of equal number is between above-mentioned link arm; The spherical bearing of twice quantity is installed in above-mentioned coupling mass and along in the evenly distributed hole of above-mentioned flange circumference.Above-mentioned link arm outer end fulcrum is connected on the spherical bearing of above-mentioned coupling mass; The inner fulcrum of above-mentioned link arm is connected on the spherical bearing of above-mentioned flange separately, and the axis of above-mentioned separately axle is to be placed to a Sharp angle, rather than is confined on same axle.
2. the above-mentioned link arm of defined spatial flexible coupling is to be made of metal in the claim 1.
3. the above-mentioned metal of defined spatial flexible coupling is a steel in the claim 2.
4. the above-mentioned link arm that can adjust defined spatial flexible coupling in the claim 3 can not disturbed the assembling of above-mentioned spatial flexible coupling to different effective lengths.
5. the ratio of the effective length of the above-mentioned link arm of defined spatial flexible coupling and above-mentioned flange radius is between the 0.01-1 in the claim 1.
6. the above-mentioned coupling mass of defined spatial flexible coupling is to be made of metal in the claim 1.
7. the above-mentioned metal of defined spatial flexible coupling is a steel in the claim 6.
8. the above-mentioned coupling mass that can adjust defined spatial flexible coupling in the claim 7 to be adapting to the variation of its Effective face width and radius, and can not disturb the assembling of above-mentioned spatial flexible coupling.
9. the above-mentioned spherical bearing of defined spatial flexible coupling is installed in the fulcrum of above-mentioned coupling mass and link arm in the claim 1, and spherical bearing aligns on the relevant position on coupling mass both sides.
10. the above-mentioned spherical bearing of defined spatial flexible coupling is installed in the fulcrum of above-mentioned coupling mass and link arm in the claim 9, and spherical bearing and coupling mass are separated by a distance.
11. the above-mentioned spherical bearing of defined spatial flexible coupling is installed in the fulcrum of above-mentioned flange and link arm in the claim 1, and spherical bearing aligns with the relevant position of flanged surface on the end face of coupling mass separately.
12. the above-mentioned spherical bearing of defined spatial flexible coupling is installed in the fulcrum of above-mentioned flange and link arm in the claim 11, and spherical bearing and link arm are separated by a distance.
13. the axis of the above-mentioned axle of defined spatial flexible coupling is to be placed to a Sharp angle in the claim 1, rather than is confined on same axle; In rotary course, spherical bearing can help to adjust above-mentioned link arm, to adapt to the angle between the above-mentioned axis of flange separately.
14. the axis angle of the above-mentioned axle of defined spatial flexible coupling can reach the 0-59 degree in the claim 13.
15. the transmission efficiency of defined spatial flexible coupling is 0.95-0.99 in the claim 1.