CN105221695A - Low friction space constant torsion spring cam mechanism - Google Patents
Low friction space constant torsion spring cam mechanism Download PDFInfo
- Publication number
- CN105221695A CN105221695A CN201510696936.7A CN201510696936A CN105221695A CN 105221695 A CN105221695 A CN 105221695A CN 201510696936 A CN201510696936 A CN 201510696936A CN 105221695 A CN105221695 A CN 105221695A
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- China
- Prior art keywords
- cam
- spring
- fork
- reel
- low friction
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H37/00—Combinations of mechanical gearings, not provided for in groups F16H1/00 - F16H35/00
- F16H37/12—Gearings comprising primarily toothed or friction gearing, links or levers, and cams, or members of at least two of these types
Abstract
Low friction space constant torsion spring cam mechanism, belongs to constant force load maintainer technical field, and the present invention solves existing plane low friction spring cam structure to there is the large problem of radial dimension.The present invention includes cam pack, spring and fork, cam pack comprises cam, roller and reel, and one end of fork connects power input shaft, and reel connects clutch end, connected by spring between fork and cam pack, realize the moment of torsion transmission between fork and cam; Power input shaft is inner at reel, and reel and power input shaft concentric, the profile of cam is fixedly connected on the madial wall of reel, and roller rolls in the slot rolling of cam, one end of spring is fixedly connected on roller, and the other end of spring is fixedly connected on the other end of fork.The present invention is used for passive type constant force system.
Description
Technical field
The invention belongs to constant force load maintainer technical field.
Background technique
Constant force load maintainer is widely used in the fields such as coil paper, thermal power generation, the testing of materials, space equipment, and it directly can have influence on the safety and reliability of equipment.Especially at space industry, providing micro-low gravitation to compensate verify astrovehicle performance by constant force system, is the ground validation mode often adopted.Traditional gravity compensation presentation mode has breeding balance, air supporting, water float, suspension method etc., and wherein suspension method gravity simulation has Active Compensation and passive compensation two kinds of modes.
In prior art, the passive type constant force output device many employings spiral spring used or torsion spring, the narrow limitation of this type of constant force device is embodied in following two aspects: one be export moment be gradual change moment, moment values is along with the change linear change of rotation angle, for ensureing that moment exports the moment nargin of end, making finally to export total energy much larger than requiring, producing additional impact; Two is that moment values is on the low side, cannot realize the output of high-torque, is difficult to the demand adapting to multiple-task.
There are some shortcomings in the design of existing plane low friction spring cam constant force system, its radial dimension is too large, and cannot meet the demands, in a lot of occasion, we want the volume of this mechanism little as much as possible.
Summary of the invention
The present invention seeks to there is the large problem of radial dimension to solve existing plane low friction spring cam structure, providing a kind of low friction space constant torsion spring cam mechanism.
Low friction space constant torsion spring cam mechanism of the present invention, it comprises cam pack, spring and fork, cam pack comprises cam, roller and reel, one end of fork connects power input shaft, reel connects clutch end, connected by spring between fork and cam pack, realize the moment of torsion transmission between fork and cam; Power input shaft is inner at reel, and reel and power input shaft concentric, the profile of cam is fixedly connected on the madial wall of reel, and roller rolls in the slot rolling of cam, one end of spring is fixedly connected on roller, and the other end of spring is fixedly connected on the other end of fork.
Advantage of the present invention: the present invention proposes and be a kind ofly suitable for the low friction space constant torsion spring cam mechanism that moment scope is wide, output torque value stabilization is high, radial dimension is little.Low friction space constant torsion spring cam mechanism of the present invention is used for passive type constant force system, for the load of high frequency change provides constant force to export.
Accompanying drawing explanation
Fig. 1 is the structural representation of low friction space constant torsion spring cam mechanism of the present invention;
Fig. 2 is the space cam profile met the demands obtained after determining spring, fork and constant-torque.
Embodiment
Embodiment one: present embodiment is described below in conjunction with Fig. 1, low friction space constant torsion spring cam mechanism described in present embodiment, it comprises cam pack, spring 3 and fork 4, cam pack comprises cam 1, roller 2 and reel 5, one end of fork 4 connects power input shaft, reel 5 connects clutch end, is connected between fork 4 and cam pack by spring 3, realizes the moment of torsion transmission between fork 4 and cam 1; Power input shaft is inner at reel 5, and reel 5 and power input shaft concentric, the profile of cam 1 is fixedly connected on the madial wall of reel 5, and roller 2 rolls in the slot rolling of cam 1, one end of spring 3 is fixedly connected on roller 2, and the other end of spring 3 is fixedly connected on the other end of fork 4.
In present embodiment, the profile of space cam 1 is fixedly connected on the reel 5 of cylinder type, and constant moment of force is passed to reel, by reel folding and unfolding hoist cable, realizes the permanent pulling force on hoist cable.
In present embodiment, space cam is as the output terminal of permanent moment of torsion, and its outer end can be connected with cylinder reel, exports constant force.Be connected by spring 3 between fork 4 and the profile of space cam 1, realize the moment of torsion transmission between two parts, suppress impulsive disturbance simultaneously.
Embodiment two: present embodiment is described below in conjunction with Fig. 1, present embodiment is described further mode of execution one, and spring 3 adopts cylindroid helicalcoil extension spring.
Embodiment three: present embodiment is described below in conjunction with Fig. 1, present embodiment is described further mode of execution one, and fork 4 connects power input shaft, and described power input shaft is motor shaft or reducer shaft.
In present embodiment, the moment of torsion that motor exports, as torque input end, is input in cam by fork 4.
Embodiment four: present embodiment is described below in conjunction with Fig. 1, present embodiment is described further mode of execution one, and spring 3 and cam pack have N group along the axis of power input shaft, and wherein N is positive integer.
Embodiment five: present embodiment is described below in conjunction with Fig. 1, present embodiment is described further mode of execution one, meets the profile Special composition curved surface of all cams 1 of spring 3 and fork 4 constant-torque condition.
In present embodiment, on this space curved surface, any curve all meets constant force requirement, is easy to use here, and choose cylindrical reel 5 and go to cut this space curved surface, intersection curve is the profile of cam 1.
Working principle of the present invention is: when stable transmission, and fork 4 is relative to cam pack without rotation, and the elastic force of spring 3 keeps constant, and the acting force arm of elastic force remains unchanged simultaneously, provides stable constant moment of force;
When reel 5 causes angle to change by load displacement, cam pack rotates relative to fork 4, and spring 3 is adapted to equilibrium position, and the elastic force of spring 3 changes, the acting force arm of elastic force changes simultaneously, but the moment exported can be kept to remain set constant.
In the present invention, the variable arm of force is adopted to realize the theory of constant moment of force output, can realize continuing in whole transmission process to export constant moment, and, consider that the layout of plane can make radial size larger, for this reason, spring is expanded in space, and, can find out according to Fig. 2, under have found same parameter, exist and can meet the demands without array space profiles.The low friction space constant torsion spring cam mechanism moment that can provide that the present invention proposes has that stability is high, be hit the feature that interference is little, output area is wide, has radial dimension little, flexible design simultaneously, and structure is simple, the feature of highly versatile.
Claims (5)
1. low friction space constant torsion spring cam mechanism, it is characterized in that, it comprises cam pack, spring (3) and fork (4), cam pack comprises cam (1), roller (2) and reel (5), one end of fork (4) connects power input shaft, reel (5) connects clutch end, connected by spring (3) between fork (4) and cam pack, realize the moment of torsion transmission between fork (4) and cam (1); Power input shaft is inner at reel (5), and reel (5) and power input shaft concentric, the profile of cam (1) is fixedly connected on the madial wall of reel (5), roller (2) rolls in the slot rolling of cam (1), one end of spring (3) is fixedly connected on roller (2), and the other end of spring (3) is fixedly connected on the other end of fork (4).
2. low friction space constant torsion spring cam mechanism according to claim 1, is characterized in that, spring (3) adopts cylindroid helicalcoil extension spring.
3. low friction space constant torsion spring cam mechanism according to claim 1, is characterized in that, fork (4) connects power input shaft, and described power input shaft is motor shaft or reducer shaft.
4. low friction space constant torsion spring cam mechanism according to claim 1, is characterized in that, spring (3) and cam pack have N group along the axis of power input shaft, and wherein N is positive integer.
5. low friction space constant torsion spring cam mechanism according to claim 1, is characterized in that, meet the profile Special composition curved surface of all cams (1) of spring (3) and fork (4) constant-torque condition.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510696936.7A CN105221695B (en) | 2015-10-23 | 2015-10-23 | Low friction space perseverance torsion spring cam mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510696936.7A CN105221695B (en) | 2015-10-23 | 2015-10-23 | Low friction space perseverance torsion spring cam mechanism |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105221695A true CN105221695A (en) | 2016-01-06 |
| CN105221695B CN105221695B (en) | 2017-11-03 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510696936.7A Active CN105221695B (en) | 2015-10-23 | 2015-10-23 | Low friction space perseverance torsion spring cam mechanism |
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| CN (1) | CN105221695B (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2903010A1 (en) * | 1979-01-25 | 1980-07-31 | Mannesmann Ag | Constant force suspension for pipeline - uses cam and coil spring arrangement to provide constant torque on shaft |
| EP0306786A1 (en) * | 1987-09-08 | 1989-03-15 | IWK Regler und Kompensatoren GmbH | Permanent hanger |
| EP0942258A2 (en) * | 1998-03-13 | 1999-09-15 | Mitutoyo Corporation | Constant-pressure mechanism and constant-torque mechanism for a measuring gauge |
| CN101000282A (en) * | 2006-12-15 | 2007-07-18 | 哈尔滨工业大学 | Multifunction test device for wheel motion performance of planetary detection robot |
| TW201219679A (en) * | 2010-11-08 | 2012-05-16 | Univ Nat Sun Yat Sen | Transmission mechanism having coaxial cam assemblies |
| CN102749191A (en) * | 2012-07-19 | 2012-10-24 | 哈尔滨工业大学 | Comprehensive test stand for simulating lunar soil exploration coring thermal property parameters |
| CN202642891U (en) * | 2012-05-22 | 2013-01-02 | 北京印刷学院 | Speed change paper feed mechanism |
| CN103496603A (en) * | 2013-09-29 | 2014-01-08 | 天津航天机电设备研究所 | Constant-force mechanism |
-
2015
- 2015-10-23 CN CN201510696936.7A patent/CN105221695B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2903010A1 (en) * | 1979-01-25 | 1980-07-31 | Mannesmann Ag | Constant force suspension for pipeline - uses cam and coil spring arrangement to provide constant torque on shaft |
| EP0306786A1 (en) * | 1987-09-08 | 1989-03-15 | IWK Regler und Kompensatoren GmbH | Permanent hanger |
| EP0942258A2 (en) * | 1998-03-13 | 1999-09-15 | Mitutoyo Corporation | Constant-pressure mechanism and constant-torque mechanism for a measuring gauge |
| CN1231437A (en) * | 1998-03-13 | 1999-10-13 | 株式会社三丰 | Constant pressure mechanism and constant torsion mechanism |
| CN101000282A (en) * | 2006-12-15 | 2007-07-18 | 哈尔滨工业大学 | Multifunction test device for wheel motion performance of planetary detection robot |
| TW201219679A (en) * | 2010-11-08 | 2012-05-16 | Univ Nat Sun Yat Sen | Transmission mechanism having coaxial cam assemblies |
| CN202642891U (en) * | 2012-05-22 | 2013-01-02 | 北京印刷学院 | Speed change paper feed mechanism |
| CN102749191A (en) * | 2012-07-19 | 2012-10-24 | 哈尔滨工业大学 | Comprehensive test stand for simulating lunar soil exploration coring thermal property parameters |
| CN103496603A (en) * | 2013-09-29 | 2014-01-08 | 天津航天机电设备研究所 | Constant-force mechanism |
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|---|---|
| CN105221695B (en) | 2017-11-03 |
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