WO2015072996A1 - Limiteur de couple à lubrification améliorée - Google Patents

Limiteur de couple à lubrification améliorée Download PDF

Info

Publication number
WO2015072996A1
WO2015072996A1 PCT/US2013/070022 US2013070022W WO2015072996A1 WO 2015072996 A1 WO2015072996 A1 WO 2015072996A1 US 2013070022 W US2013070022 W US 2013070022W WO 2015072996 A1 WO2015072996 A1 WO 2015072996A1
Authority
WO
WIPO (PCT)
Prior art keywords
plunger
bushing
drive ball
grease
torque limiter
Prior art date
Application number
PCT/US2013/070022
Other languages
English (en)
Inventor
Randal R. LONG
Mark Wayne Rudolph
Ryan Jesse
Shane Johnson
Thomas Ross
Original Assignee
Long Randal R
Mark Wayne Rudolph
Ryan Jesse
Shane Johnson
Thomas Ross
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 Long Randal R, Mark Wayne Rudolph, Ryan Jesse, Shane Johnson, Thomas Ross filed Critical Long Randal R
Priority to PCT/US2013/070022 priority Critical patent/WO2015072996A1/fr
Publication of WO2015072996A1 publication Critical patent/WO2015072996A1/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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D43/00—Automatic clutches
    • F16D43/02—Automatic clutches actuated entirely mechanically
    • F16D43/20—Automatic clutches actuated entirely mechanically controlled by torque, e.g. overload-release clutches, slip-clutches with means by which torque varies the clutching pressure
    • F16D43/202—Automatic clutches actuated entirely mechanically controlled by torque, e.g. overload-release clutches, slip-clutches with means by which torque varies the clutching pressure of the ratchet type
    • F16D43/204—Automatic clutches actuated entirely mechanically controlled by torque, e.g. overload-release clutches, slip-clutches with means by which torque varies the clutching pressure of the ratchet type with intermediate balls or rollers
    • F16D43/208—Automatic clutches actuated entirely mechanically controlled by torque, e.g. overload-release clutches, slip-clutches with means by which torque varies the clutching pressure of the ratchet type with intermediate balls or rollers moving radially between engagement and disengagement
    • 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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D7/00—Slip couplings, e.g. slipping on overload, for absorbing shock
    • F16D7/04—Slip couplings, e.g. slipping on overload, for absorbing shock of the ratchet type
    • F16D7/06—Slip couplings, e.g. slipping on overload, for absorbing shock of the ratchet type with intermediate balls or rollers
    • F16D7/10—Slip couplings, e.g. slipping on overload, for absorbing shock of the ratchet type with intermediate balls or rollers moving radially between engagement and disengagement
    • 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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2300/00—Special features for couplings or clutches
    • F16D2300/06—Lubrication details not provided for in group F16D13/74
    • 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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D3/00—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive
    • F16D3/16—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts
    • F16D3/18—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts the coupling parts (1) having slidably-interengaging teeth
    • F16D3/185—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts the coupling parts (1) having slidably-interengaging teeth radial teeth connecting concentric inner and outer coupling parts

Definitions

  • This invention concerns torque limiters which are well known devices which act to produce an overload release in a rotary drive train when the torque transmitted exceeds a predetermined level, in order to prevent damage to components in the drive train.
  • Resettable torque limiters are also well known in which drive balls are installed in detent pockets and held therein by a plunger urged against the drive ball by spring pressure. When a predetermined maximum torque is reached, the drive ball can force the plunger away and allow the drive ball to climb out of the pocket allowing relative rotation of two interfit parts to interrupt the driving connection therebetween.
  • grease is applied to the wearing components by injection into a passage drilled through the plunger to the drive ball engaged with the plunger end, and passages radially out past a bushing to reach various wear components.
  • lubricant passages in the plunger and bushing that allow free flow of lubricant to points which will adequately lubricate the moving components in a drive device such as a torque limiter.
  • This includes a central passage extending lengthwise down the plunger which terminates short of the end in contact with the drive ball which central passage is connected to a cross passages extending radially short offset longitudinal passages then distribute lubricant to an open annular space extending around the drive ball, as well as laterally to a clearance between the plunger and the ID of a bore in a bushing in which the plunger is slidably fit. Lubricant from the open spaces further enters cross passages in the bushing which extends to the bushing bore ID as well as lengthwise passages through the bushing to reach the lower regions and the detent pocket.
  • a disconnect nut threadably engages the upper end of a plunger shroud secured to the plunger upper end and when rotated with a wrench causes raising of the plunger to manually elevate the plunger sufficiently to release the torque limiter by driving the locking balls radially outward.
  • the torque limiter release enables the lubrication of bearings supporting the interfit drive parts which are included in the torque limiter, which normally cannot be greased when the torque limiter is not in a released condition. Improved lubrication of the torque limiter running parts is also facilitated.
  • Figure 1 is a sectional view of a prior art torque limiter of a type with which the present invention is concerned showing a conventional grease passage pattern.
  • Figure 2 is a view of prior art driving and driven interfit parts combined with a conventional torque limiter to create a driving connection therebetween.
  • Figure 3 is an external pictorial view of a torque limiter according to the present invention.
  • FIG 4 is an enlarged sectional view of the torque limiter according to the present invention shown in Figure 3.
  • FIG 5 is an enlarged sectional view of a plunger included in the torque limiter shown in Figures 3 and 4.
  • Figure 6 is an enlarged sectional view of a bushing included in a torque limiter according to the invention shown in Figures 3 and 4.
  • FIG. 1 and 2 a prior art torque limiter 10 of the type which the present invention is concerned is shown.
  • torque limiters may be installed circumferentially spaced about the axis of a pair of interfit rotary parts 12 and 14 other arrangements of such torque limiters are well known..
  • One interfit rotary part 12 is secured to a drive (or driven) member 16 and the other rotary part 14 is secured to a driven (or drive) member 18.
  • a drive ball 20 is normally seated within a detent pocket 22 fixed in rotary member 14 and a bushing 24 fixed within a housing 26 is secured to rotary member 12.
  • the drive ball 20 creates a rotational connection so that the rotary members 12 and 14 normally rotate together.
  • the drive ball 20 Upon the development of a transmitted torque of a predetermined level, the drive ball 20 begins to ride up the sloping sides of the detent pocket 22 and to thereby push up a plunger 28 which has radiused pocket 21 (Figure 5) at its lower end in contact with the drive ball 20.
  • the plunger 28 is urged downwardly by the effect of a stiff spring 36.
  • the spring36 exerts pressure on a set of small locking balls 30 engaged by a rounded shoulder surface 29 on the upper end of the plunger 28 tending to force the balls 30 radially out.
  • any axial movement of the plunger 28 is resisted by the constraining effect exerted by an outer thrust race 32 and an inner thrust race 34 urged together by the preloaded spring 36 applying an axial force to inner thrust race 34.
  • An adjusting nut 37 allows setting of the spring preload. If the transmitted torque level reaches a predetermined release value, the spring force described is overcome to move the outer race 34 down and allow the locking balls 30 to move out radially sufficiently to move onto the outer diameter 36 on the plunger 28.
  • the torque limiter 10 can be reset by striking the upper end 42 of the plunger with sufficient force in the well know manner.
  • a grease fitting 44 is normally provided which allows injection of grease into an axial central passage 46 in the plunger 28 which passes down to the top of the drive ball 20 which normally prevents any further grease flow.
  • the upper pair of passages lubricate the races 32, 34 and locking balls 30.
  • the lower pair of feed cross passages 52 reach the bottom of the bushing and theoretically reach the detent pocket 22 and drive ball 20 via a clearance and small grooves. However, little or no grease will reach the lower components as a practical matter due to the slight clearances.
  • Grease will only exit the lower end of the passage 46 when the torque limiter 10 has been released by movement of the plunger 28.
  • the bearings 40 can only effectively be greased during routine maintenance when the torque limiter is tripped. This is almost impossible to do manually due to very high torque limit settings often used in some applications. Since the bearings 40 are typically heavily preloaded and do not rotate while the torque limiter remains locked, heavy wear can result as the grease over time tends to migrate out due to rotation of the assembly and consequently the bearings 40 become dry.
  • a torque limiter 54 according to the invention is shown. This includes a housing 56 which has a threaded extension 58 which receives a disconnect nut 60 which engages a plunger shroud 66 threaded to the upper end 64 of the plunger 28.
  • a recess 68 in the plunger shroud 66 receives a grease fitting 70.
  • An axial central lengthwise grease passage 72 is provided in the plunger 28, which terminates short of the drive ball 74. Instead, there are two cross passages 76 which connect with two pairs of offset longitudinal passages 78 that extend to an annular clearance space 80 adjacent the drive ball 74.
  • the bushing 82 has two cross passages 84, each receiving grease from the annular space 80 and direct into the same out through down passages 86 through the bushing 82 so that grease can reach the detent pocket 88.
  • the cross passages 76 extend to the inside diameter of the bushing 82 to provide additional grease.
  • the set of grease passages described are able to effectively direct grease to the wearing components without releasing the torque limiter.
  • a second aspect of the invention does involve the disconnect nut 60 and plunger shroud 66.
  • the disconnect nut 60 has a series of wrenching flats 90 thereon so that a wrench can be used to turn the same and advance the disconnect nut 60 up as viewed in Figure 4 on the external threads on the housing extension 58.
  • the upper recessed face of the disconnect nut 60 will engage an underside of flange 92 on the plunger shroud 66 so as to pull up the plunger 62 as the shroud 66 is elevated.
  • the powerful mechanical advantage exerted by of the threaded engagement of the disconnect nut 60 enables the balls 96 to be forced out until the torque limiter 54 becomes disconnected, even if the torque release level is set to be very high.
  • the bearings 40 can be rotated and greased as a part of a regular maintenance regime.
  • flow of grease to the torque limiter wear components as described above is enhanced.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Transmission Devices (AREA)
  • One-Way And Automatic Clutches, And Combinations Of Different Clutches (AREA)

Abstract

Limiteur de couple comportant des passages de graisse conçus pour permettre une meilleure lubrification des pièces d'usure. Un écrou de désaccouplement est également prévu pour faciliter la libération du limiteur de couple même en cas de réglages de libération très élevés afin de permettre un graissage dans le cadre d'un régime d'entretien.
PCT/US2013/070022 2013-11-14 2013-11-14 Limiteur de couple à lubrification améliorée WO2015072996A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/US2013/070022 WO2015072996A1 (fr) 2013-11-14 2013-11-14 Limiteur de couple à lubrification améliorée

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US2013/070022 WO2015072996A1 (fr) 2013-11-14 2013-11-14 Limiteur de couple à lubrification améliorée

Publications (1)

Publication Number Publication Date
WO2015072996A1 true WO2015072996A1 (fr) 2015-05-21

Family

ID=53057779

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2013/070022 WO2015072996A1 (fr) 2013-11-14 2013-11-14 Limiteur de couple à lubrification améliorée

Country Status (1)

Country Link
WO (1) WO2015072996A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107139015A (zh) * 2017-06-02 2017-09-08 东南大学 周向传动阈值可调式过载保护装置
CN110345174A (zh) * 2018-04-05 2019-10-18 埃莱萨公司 包含扭矩限制装置的操纵元件
FR3102816A1 (fr) * 2019-10-30 2021-05-07 Airbus Helicopters système de transmission d’efforts à limitation de couple

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4896755A (en) * 1986-09-05 1990-01-30 Girguis Sobhy Labib Overload clutch
US5092441A (en) * 1989-09-30 1992-03-03 Tsubakimoto Emerson Co. Manually restorable overload clutch
WO2012097847A1 (fr) * 2011-01-18 2012-07-26 R + W Antriebselemente Gmbh Accouplement de sécurité

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4896755A (en) * 1986-09-05 1990-01-30 Girguis Sobhy Labib Overload clutch
US5092441A (en) * 1989-09-30 1992-03-03 Tsubakimoto Emerson Co. Manually restorable overload clutch
WO2012097847A1 (fr) * 2011-01-18 2012-07-26 R + W Antriebselemente Gmbh Accouplement de sécurité

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107139015A (zh) * 2017-06-02 2017-09-08 东南大学 周向传动阈值可调式过载保护装置
CN110345174A (zh) * 2018-04-05 2019-10-18 埃莱萨公司 包含扭矩限制装置的操纵元件
CN110345174B (zh) * 2018-04-05 2022-07-19 埃莱萨公司 包含扭矩限制装置的操纵元件
FR3102816A1 (fr) * 2019-10-30 2021-05-07 Airbus Helicopters système de transmission d’efforts à limitation de couple

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