WO2003104682A1 - Support de moteur a reglage automatique de tension pour ensemble d'entrainement - Google Patents

Support de moteur a reglage automatique de tension pour ensemble d'entrainement Download PDF

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Publication number
WO2003104682A1
WO2003104682A1 PCT/US2003/018407 US0318407W WO03104682A1 WO 2003104682 A1 WO2003104682 A1 WO 2003104682A1 US 0318407 W US0318407 W US 0318407W WO 03104682 A1 WO03104682 A1 WO 03104682A1
Authority
WO
WIPO (PCT)
Prior art keywords
motor
self
tensioning
motor mount
belt
Prior art date
Application number
PCT/US2003/018407
Other languages
English (en)
Inventor
Arancode R. Krishnan
Michael J. Franklin
Original Assignee
Twin City Fan Companies, Ltd.
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Twin City Fan Companies, Ltd. filed Critical Twin City Fan Companies, Ltd.
Publication of WO2003104682A1 publication Critical patent/WO2003104682A1/fr

Links

Classifications

    • 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
    • F16H7/00—Gearings for conveying rotary motion by endless flexible members
    • F16H7/08—Means for varying tension of belts, ropes, or chains
    • F16H7/10—Means for varying tension of belts, ropes, or chains by adjusting the axis of a pulley
    • F16H7/14—Means for varying tension of belts, ropes, or chains by adjusting the axis of a pulley of a driving or driven pulley
    • 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
    • F16H7/00—Gearings for conveying rotary motion by endless flexible members
    • F16H7/08—Means for varying tension of belts, ropes, or chains
    • F16H7/0848—Means for varying tension of belts, ropes, or chains with means for impeding reverse motion
    • F16H2007/0851—Wedges
    • 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
    • F16H7/00—Gearings for conveying rotary motion by endless flexible members
    • F16H7/08—Means for varying tension of belts, ropes, or chains
    • F16H7/0829—Means for varying tension of belts, ropes, or chains with vibration damping means
    • F16H7/0831—Means for varying tension of belts, ropes, or chains with vibration damping means of the dry friction type

Definitions

  • the present invention relates to an apparatus for use with motor assemblies, more particularly to a self-tensioning motor mount wherein a pivot regulating mechanism is provided to counteract pivot motion in a belt slackening direction in furtherance of minimizing drive assembly instability.
  • the present invention provides embodiments of a motor base for use with motors utilized with a continuous drive belt wherein one or more mechanisms are employed to slow/reduce the amount of movement of the motor and belt to thereby limit the tightening and slacking permitted by the belt, thus greatly reducing deleterious instability in the self-tensioning drive assembly due to belt skipping, hopping, etc.
  • Embodiments of the present invention provide dampening, cushioning or other regulating mechanisms that control the movement of the motor in a belt tensioning direction and/or in an opposite belt slackening direction.
  • a portion of the motor base of the present invention may be integrally part of a motor housing, or may be a separate unit.
  • the motor base generally includes a pivotable motor receiving member, an anchorable base, and a pivot regulating mechanism.
  • the pivoting member on which the motor is mounted or integrated therewith, is pivotally mounted to an anchorable base allowing the pivoting member to pivot relative to same.
  • the movement or motion of the motor and pivoting member can generally be described as being in either a belt tensioning direction or in an opposite, belt slackening direction.
  • the pivot regulating mechanism is generally, but not necessarily, connected between the base and pivoting member for providing a counterbalancing or opposing force in at least one direction of pivotal movement of the motor.
  • the regulating member provides a force against which the motor movement must overcome before the motor begins to move, and continues to provide a generally opposite force during the movement of the motor. Accordingly, the movement of the motor is slowed and the distance that the motor travels may be reduced.
  • the regulating member may act to absorb some of the energy utilized to move the motor and pivoting member by converting mechanical energy into thermal energy. It is preferred that the pivoting member retain the ability to move from a first position to a second position, and substantially return to its initial first position while the regulating member is providing force during the movement of the pivoting member.
  • a regulating mechanism can provide several advantages. For example, the amount of movement of the belt and motor is reduced and, therefore, stress on the material of the belt is reduced which lowers the risk of breakage of the belt and lowers the rate and extent of stretching of the belt. Additionally, by slowing the movement of the motor, the frequency at which the motor moves from its maximum distance from the driven device to its minimum distance is reduced and thereby the tendency for bouncing or harmonic oscillation of the motor is reduced.
  • FIG. 1 generally illustrates a self-tensioning drive assembly, more particularly, a motor mounted upon a motor support structure having a pivotable platform;
  • FIGS. 2 illustrates physical relationships between select elements of the assembly components of FIG. 1;
  • FIG. 3 is an orthogonal overhead view of a motor support structure of the subject invention
  • FIG. 4 is a top view of the motor support structure of FIG. 2;
  • FIG. 5 is an end view of the motor support structure of FIG. 3, taken along line 5-5 thereof;
  • FIG. 6 is an orthogonal overhead view of an alternate motor support structure of the subject invention.
  • FIG. 7 is a top view of the motor support structure of FIG. 5;
  • FIG. 8 is an end view of the motor support structure of FIG. 6, taken along line 8-8 thereof;
  • FIG. 9 is an orthogonal overhead view of further, alternate motor support structure of the subject invention.
  • FIG. 10 is a top view of the motor support structure of FIG. 8;
  • FIG. 11 is an end view of the motor support structure of FIG. 9, taken along line 11-11 thereof;
  • FIG. 12 is an orthogonal overhead view of still a further, alternate motor support structure of the subject invention.
  • FIGS. 13A-D illustrate a stepwise functionality of the motor support structure of FIG. 13.
  • the present invention provides embodiments of a self- tensioning motor support structure or mount for use with motors utilizing a continuous drive belt wherein a variety of pivot regulating mechanisms are employed to regulate (e.g., slow, reduce and/or counterbalance) the amount of movement of the belt and motor, in a belt slackening direction, thereby minimizing instability in a drive assembly incorporating same. Regulation or control of the self-tensioning mechanism is desirable and advantageous, having a direct and significant impact upon stable drive assembly operation, and thus reduced operational costs for such assemblies.
  • the self-tensioning drive assembly 16 generally includes a driving device 18, such as a motor, having an output shaft 20, supported upon or by a driving device support structure 22 which preferably includes an anchorable base 24 and a motor receiving platform 26 operatively engaged therewith so as to be pivotable about a pivot axis 28.
  • a driving device 18 such as a motor
  • the driving device support structure 22 which preferably includes an anchorable base 24 and a motor receiving platform 26 operatively engaged therewith so as to be pivotable about a pivot axis 28.
  • a drive 30 operatively joins the output shaft 20 of the driving device 18 with an input shaft 32 of the driven device 34, the drive 30 generally including a drive sheave 36, a driven sheave 38, and an endless loop 40 such as a belt.
  • Directional movement of the motor 18, mounted in a manner so as to provide a self-tensioning drive assembly may be generally characterized as being in either a belt tensioning direction (T) , a direction distal to the driven device, or, in an belt slackening direction (S) , a direction proximal to the driven device.
  • the driving device support structure 22 (i.e., self-tensioning motor mount) of the subject assembly 16 generally includes an anchorable base 24 and a selectively positionable platform 26, pivotable, with respect to the base 24, about a pivot axis 28.
  • the driving device 18 is selectively affixed to the platform 26, the platform 26 being operatively engaged or engagable as previously outlined, or, more generally, as is well known to those of ordinary skill with same.
  • the platform may alternately be integrally formed with a housing of the driving device, or more generally, the functionality of the platform (i.e., pivoting or tilted support) may be incorporated into the driving device so as to eliminate such structure from the driving device structure as described .
  • the motor receiving platform 26 of the self-tensioning motor mount 22 generally, but not necessarily, includes a pair of spaced apart arms 42, each of the arms 42 being adapted so as to selectively receive or variably position the motor 18 therealong, as will be later discussed.
  • An upper surface 44 of each of the platform arms 42 includes at least a single slot 46 into which is receivable a portion of the motor 18, or mounting hardware therefore, for securing same to the platform 26.
  • the anchorable base 24 of the self-tensioning motor mount 22 generally, but not necessarily, includes a pair of spaced apart brackets 50, each of the brackets 50 being adapted so as to selectively receive or variably position the motor receiving platform 26 therealong, as will be later discussed.
  • the brackets 50 as shown, generally include platform engaging portions 52 and anchor receiving portions 54.
  • Each of the platform engaging portions 52 of the brackets includes at least a single slot or guide into which a shaft receiving structure is received or insertable .
  • the driving device 18 is variably positionable with respect to the platform 26 of the self-tensioning motor mount 22, the platform 26 in turn being variable positionable with respect to the base 24 thereof.
  • the platform 26 of the driving support structure 22 is translatable with respect to the base 24 thereof so as to define a variable offset distance (Hpb) between the pivot axis 28 of the support structure 22 and the base 24 thereof (i.e., the pivot point of the platform relative to the base is variable)
  • the driving device 18 is translatable with respect to the platform 26 upon which it is receivable so as to define a variable offset distance (Vpb) between the pivot axis 28 of the support structure 22 and the output shaft 20 of the driving device 18.
  • the height or thickness of the driving device support structure 22 (i.e., the distance between opposed parallel aligned exterior surfaces of the base and platform, or said another way, the distance between the "bottom” of base 24 and the “top” 44 of platform 26 when oriented so as to be parallel) ; the height of, or distance between, the pivot axis 28 relative to the bottom of the base 24 (Tpb) ; and, the height or distance between the driving device output shaft 20 centerline and the top 44 of the platform 26 (Dnema) .
  • a pivot regulating mechanism preferably operatively disposed between portions of the anchorable base and the motor receiving platform.
  • the pivot regulating mechanism is typically, but not necessarily, positioned so as to connect the motor receiving platform with the anchorable base. It is preferred that the pivot regulating mechanism provides an initial force which the motor movement must overcome.
  • the pivot regulating mechanism preferentially permits pivoting of the motor receiving platform, relative to the anchorable base, in belt tightening direction T, as opposed to belt slackening direction S, so as to thereby provide an increase in belt tension during acceleration of a driven device, and a commensurate decrease in belt tension during sustained operation of the driven device.
  • the aforementioned general functionality of the pivot regulating mechanism is preferably achieved via utilization of dampening, biasing, and/or frictional elements. A detailed discussion of the pivot regulating mechanism follows with respect to the several embodiments of the self-tensioning motor mount of FIGS. 3, 6, 9, & 12.
  • a pivot regulating mechanism 56 comprising at least a single shock absorber 58 (e.g., a piston-type mechanical, one-way, non-adjustable shock absorber, similar in design to those utilized in the automobile industry) disposed between portions of anchorable base 24 and the motor receiving platform 26.
  • shock absorbers act to counteract the amount of force applied between two elements (i.e., structures), attached to the opposing ends of same, by converting some of the mechanical energy, used to provide the force, to thermal energy in the form of heat. Therefore, the amount of energy that is translated into movement of the elements is reduced.
  • mechanical shock absorbers utilize a piston 60 mounted in a cylinder 62 filled with fluid.
  • the cylinder 62 of the absorber 58 is shown mounted to a brace 64 of the anchorable base 24, with a free end of the piston 60 of the absorber 58 shown mounted indirectly to an arm 42 of the motor receiving platform 26.
  • the attachment of the regulator components to the other motor mount components may be by any means known in the art.
  • one end of the regulating mechanism 56 is mounted to a portion of the platform 26, in this case brace 64, with a shoulder bolt 66.
  • the shoulder bolt 66 may be attached to a cooperating nut or the brace 64 may be threaded to fix the shoulder bolt 66 in place.
  • the other end of the regulating mechanism 56 for example piton 60, is mounted to a bar 68, connected to arm 42 of platform 26, by shoulder bolt 66.
  • the motor support structure 22 has a pivot axle 48 with a bearing casing 70 attached thereon and the bar 68 mounted thereto.
  • the regulating mechanism be aligned with the direction of motor movement. For example, this may be accomplished by mounting the bar 68 perpendicular to the surface 44 of the pivoting arm 42 upon which the motor 18 is to be mounted, and by attaching the regulating mechanism to have connections to the bar 68 and support member 22, thereby allowing the regulating member to radially pivot with respect to both the support member 22 and the bar 68.
  • shock absorbers typically have a minimum and maximum extension length.
  • these fixed dimensions can provide limits for the travel of the pivot member and, accordingly, can also limit the travel of the motor and the tension of the belt, and are therefore preferred.
  • the regulating member converts some of the energy, used to move the pivot member, into heat and effectively slows movement of same.
  • the pivot regulating mechanism desirably may combine one or more similar or different dampening or biasing elements.
  • Suitable shock absorbing elements may include, but not be limited to, mechanical and non-mechanical, adjustable and non-adjustable, and one-way or two-way devices.
  • some elastomeric materials and more conventional spring designs may suitably provide a regulating or cushioning force adequate to counter balance heretofore known self- tensioning motor mounts .
  • the shock absorber slows the motion in its compression stroke, and allows free motion in the extension stroke.
  • the extension stroke corresponds to the downward motion of the pivot base.
  • the additional torque required to accelerate the fan causes the motor to pivot freely downwardly, which maintains adequate belt tension to prevent belt slippage.
  • the shock absorber slows the return upward motion. Slowing the upward motion prevents motor hop.
  • the subject design preserves one of the important benefits of the pivoting motor base, more particularly, the pivoting feature provides the additional belt tension required during fan acceleration, and then reduces the tension to adequate levels during normal operation. The benefit is an increase in belt life and reduce loads on the motors and fan bearings.
  • Other anti-hop devices allow the base to pivot during start-up, but do not allow for any return motion, resulting in higher than necessary belt tension.
  • a pivot regulating mechanism comprising a biasing web assembly 172 extending from a portion of the anchorable base 124.
  • the web assembly 172 preferably includes a web or strap 174, and a energy dampening or tensioning assembly 176.
  • a first end of the web 174 is fixed to a portion of the anchorable base 124, more particularly a brace 164 uniting the spaced apart brackets 150, so as to extend and wrap about the shaft 148 of the motor receiving platform 126.
  • a free end of the web 174 is indirectly linked to the portion of the anchorable base 124 from which it generally extends via the tensioning assembly 176, which preferably includes a dampening element 178 (e.g., a spring as shown) and mechanism 180 for selectively adjusting the tension in the dampening element (e.g., a knob 182 threadingly received on a shaft 184 as shown).
  • the tensioning assembly 176 permits a range of frictional engagement to be imparted to the shaft 148 of the motor receiving platform 126, via the web or strap 174, thereby slowing or preventing rotation the shaft, and thereby the motor receiving platform.
  • a pivot regulating mechanism comprising at least a single wedge arm 286 interposed between the anchorable base 224 and the motor receiving platform 226 so as to limit pivot motion of the platform 226 in the belt slackening direction.
  • a pair of wedge arms 286 are mounted or generally supported by a portion of the anchorable base 224, as by a shaft 286 traversing the spaced apart brackets 250 of same, so as to be pivotable about a pivot axis 290.
  • the pivot axis 290 of the wedge arms 286 are substantially parallel with the pivot axis 228 of the motor receiving platform 226.
  • a free end of the wedge arm 286 is adapted so as to have at least a portion thereof received in an aperture or slot 292 in the arm 242 of the motor receiving platform 226.
  • a spring or other biasing element 294 tethers the free end of the wedge arm 286 to the anchorable base 224.
  • the wedge arms 286 are arranged at a steep angle with respect to the slot 292 of the platform 242, thereby allowing the pivot base 226 to rotate freely in the downward, belt tensioning direction. In the upward belt slackening direction, the arms 286 wedge against the margin of the slot 292 so as to prevent motion in said direction.
  • the motor receiving platform of the self- tensioning motor mount thusly pivots downward during fan start-up, but the wedging action of the arms prevent any return upward motion.
  • a pivot regulating mechanism comprising at least a single cam arm 361 depending from the motor receiving platform 326, more particularly, the arms 342 thereof.
  • the cam arms 361 are pivotably mounted near free ends of the arms 342 of the platform 326, more particularly, near free arm ends proximal to the driven device (i.e., the cam arms 361 are positioned on the platform 326 opposite the motor 318, or said another way, the cam arms 361 are positioned on one side of the pivot axis 328 of the platform 326, the motor 318 on the other side thereof) .
  • the cam arms 361 are weighted, or otherwise balanced so as to rotate (e.g., in a counterclockwise direction, see FIGS. 13A-13D) as the motor receiving platform 326 pivots in a belt tightening direction such that a camming surface 363 of the cam arm 361 maintains contact with the self-tensioning motor mount surface 365 (i.e., the surface or structure to/with which the anchorable base 324 is anchored) .
  • the camming surface 363 of the arm 361 is shaped or otherwise configured so that as the motor receiving platform 326 pivots downward, a line from the cam arm pivot axis 367 to a contact point of the camming surface 363 with the base mounting surface 365 is most nearly perpendicular to same. Maintaining the point of contact as close as possible to perpendicular with the pivot axis 367; the cam arm maximizes the normal force, and thus the resulting friction, which works to resist any slipping of the camming surface 363 on the mounting surface 365.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)

Abstract

L'invention concerne un support (22) de moteur à réglage automatique de tension qui présente: une base ancrable (24), une plate-forme (26) de réception du moteur fonctionnellement mise en contact avec cette base ancrable de façon à pivoter autour d'un axe (28) de pivot, et un mécanisme (56) de régulation de pivot. Ledit mécanisme (56) de régulation de pivot permet de préférence de faire pivoter ladite plate-forme (26) de réception du moteur par rapport à ladite base ancrable (24), dans un sens de serrage de courroie, par opposition à un sens de desserrage de courroie. Cette structure permet d'obtenir une augmentation de la tension de courroie pendant l'accélération d'un dispositif entraîné (34), et une réduction correspondante de la tension de courroie pendant un fonctionnement soutenu de celui-ci.
PCT/US2003/018407 2002-06-10 2003-06-10 Support de moteur a reglage automatique de tension pour ensemble d'entrainement WO2003104682A1 (fr)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
US38734902P 2002-06-10 2002-06-10
US38745602P 2002-06-10 2002-06-10
US38734802P 2002-06-10 2002-06-10
US60/387,348 2002-06-10
US60/387,456 2002-06-10
US60/387,349 2002-06-10

Publications (1)

Publication Number Publication Date
WO2003104682A1 true WO2003104682A1 (fr) 2003-12-18

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PCT/US2003/018407 WO2003104682A1 (fr) 2002-06-10 2003-06-10 Support de moteur a reglage automatique de tension pour ensemble d'entrainement

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WO (1) WO2003104682A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104389964A (zh) * 2014-09-15 2015-03-04 昆山格天美治农机设备有限公司 一种用于农机转轮电机自动张紧装置
CN109573780A (zh) * 2018-12-26 2019-04-05 宁国东方碾磨材料股份有限公司 一种高性能电梯用电机基座
DE102016006469B4 (de) * 2015-06-16 2020-01-02 Scania Cv Ab Antriebssystem mit Riemenkreisen
CN116969130A (zh) * 2023-09-21 2023-10-31 原平市兴胜机械制造有限公司 输送机的张紧组件以及输送机

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FR566037A (fr) * 1922-05-22 1924-02-08 Automatic Refrigerating Compan Perfectionnements aux appareils de commande à moteur
US1935877A (en) * 1929-07-17 1933-11-21 Rockwood Mfg Company Pivotal mounting for pulley structures
US2024127A (en) * 1934-02-21 1935-12-10 American Pulley Co Motor support
GB475002A (en) * 1936-09-12 1937-11-11 Gen Fibre Products Inc Improvements in and relating to pivotal mountings for pulley structures
US2522960A (en) * 1949-11-14 1950-09-19 Frederick S Price Drive device
US2568290A (en) * 1948-11-26 1951-09-18 Mountain Edward Motor mount
US3477670A (en) * 1968-01-10 1969-11-11 Automatic Motor Base Co Hinged support for motors and other machinery
JPS57149651A (en) * 1981-03-09 1982-09-16 Ricoh Co Ltd Elongation absorber for wire rope
EP0294919A1 (fr) * 1987-03-24 1988-12-14 Litens Automotive Inc Tendeur de courroie avec frein d'amortissement à ruban commandé par ressort
US5921876A (en) 1997-05-27 1999-07-13 Cml Northern Blower Inc. Pivotal motor mount for tensioning a belt drive with a one-way restraint allowing pivotal movement in a tensioning direction and preventing movement in a slackening direction
US5924947A (en) * 1997-07-23 1999-07-20 Ford Global Technologies, Inc. Asymmetrically hydraulically damped drivebelt tensioner for automotive engine

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Publication number Priority date Publication date Assignee Title
FR566037A (fr) * 1922-05-22 1924-02-08 Automatic Refrigerating Compan Perfectionnements aux appareils de commande à moteur
US1935877A (en) * 1929-07-17 1933-11-21 Rockwood Mfg Company Pivotal mounting for pulley structures
US2024127A (en) * 1934-02-21 1935-12-10 American Pulley Co Motor support
GB475002A (en) * 1936-09-12 1937-11-11 Gen Fibre Products Inc Improvements in and relating to pivotal mountings for pulley structures
US2568290A (en) * 1948-11-26 1951-09-18 Mountain Edward Motor mount
US2522960A (en) * 1949-11-14 1950-09-19 Frederick S Price Drive device
US3477670A (en) * 1968-01-10 1969-11-11 Automatic Motor Base Co Hinged support for motors and other machinery
JPS57149651A (en) * 1981-03-09 1982-09-16 Ricoh Co Ltd Elongation absorber for wire rope
EP0294919A1 (fr) * 1987-03-24 1988-12-14 Litens Automotive Inc Tendeur de courroie avec frein d'amortissement à ruban commandé par ressort
US5921876A (en) 1997-05-27 1999-07-13 Cml Northern Blower Inc. Pivotal motor mount for tensioning a belt drive with a one-way restraint allowing pivotal movement in a tensioning direction and preventing movement in a slackening direction
US5924947A (en) * 1997-07-23 1999-07-20 Ford Global Technologies, Inc. Asymmetrically hydraulically damped drivebelt tensioner for automotive engine

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PATENT ABSTRACTS OF JAPAN vol. 006, no. 256 (M - 179) 15 December 1982 (1982-12-15) *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104389964A (zh) * 2014-09-15 2015-03-04 昆山格天美治农机设备有限公司 一种用于农机转轮电机自动张紧装置
DE102016006469B4 (de) * 2015-06-16 2020-01-02 Scania Cv Ab Antriebssystem mit Riemenkreisen
CN109573780A (zh) * 2018-12-26 2019-04-05 宁国东方碾磨材料股份有限公司 一种高性能电梯用电机基座
CN116969130A (zh) * 2023-09-21 2023-10-31 原平市兴胜机械制造有限公司 输送机的张紧组件以及输送机
CN116969130B (zh) * 2023-09-21 2023-12-15 原平市兴胜机械制造有限公司 输送机的张紧组件以及输送机

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