GB2165899A - Coupling torque limiter - Google Patents

Coupling torque limiter Download PDF

Info

Publication number
GB2165899A
GB2165899A GB08524363A GB8524363A GB2165899A GB 2165899 A GB2165899 A GB 2165899A GB 08524363 A GB08524363 A GB 08524363A GB 8524363 A GB8524363 A GB 8524363A GB 2165899 A GB2165899 A GB 2165899A
Authority
GB
United Kingdom
Prior art keywords
balls
torque limiter
element
seat
output element
Prior art date
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.)
Granted
Application number
GB08524363A
Other versions
GB2165899B (en
GB8524363D0 (en
Inventor
Masao Fukumoto
Original Assignee
Masao Fukumoto
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
Priority to JP15475084U priority Critical patent/JPS6169524U/ja
Priority to JP15475184U priority patent/JPS6169525U/ja
Application filed by Masao Fukumoto filed Critical Masao Fukumoto
Publication of GB8524363D0 publication Critical patent/GB8524363D0/en
Publication of GB2165899A publication Critical patent/GB2165899A/en
Application granted granted Critical
Publication of GB2165899B publication Critical patent/GB2165899B/en
Application status is Expired legal-status Critical

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16DCOUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D7/00Slip couplings, e.g. slipping on overload, for absorbing shock
    • F16D7/04Slip couplings, e.g. slipping on overload, for absorbing shock of the ratchet type
    • F16D7/06Slip couplings, e.g. slipping on overload, for absorbing shock of the ratchet type with intermediate balls or rollers
    • F16D7/08Slip couplings, e.g. slipping on overload, for absorbing shock of the ratchet type with intermediate balls or rollers moving axially between engagement and disengagement

Abstract

A torque limiter is built into a rotation-transmitting coupling and used to prevent an excessive load applied to an output element (24) from being transmitted back to an input element (21). The torque limiter includes a ring plate (22) having holes (23) containing balls (26), which plate is fixed to and rotates with an input element (21). A ball seat formed by the surface of an output element (24), is provided with tapered holes or recesses (30) for receiving the balls, and a thrust seat (25) is provided, having a surface which is pressed against the balls. The ball seat and the thrust seat are disposed on opposite sides of the ring plate so as to compress the balls (26) located in the holes (23). The rims of the tapered recesses (30) are rounded into arcuate form, and circular grooves such as, (33) are formed in at least one of the opposed surfaces of the ball seat and thrust seat. This configuration greatly reduces the contact pressure between the balls and the opposed surfaces when an excessive load is applied to the output element and the balls roll around in the grooves. <IMAGE>

Description

SPECIFICATION Torque limiter This invention concerns a torque limiter which prevents an excessive load applied to an output element from being transmitted to an input element. The torque limiter can be built into various sorts of rotation-transmitting couplings in order to prevent an excessive load from being transmitted from an output element to an input element.

A conventional torque limiter, as shown in Fig. 5, includes a ring plate 12 pierced with holes 13 within which balls 14 are held, the ring with plates being fixed to and rotatable in association with an input element 11. A ball seat member 16 is provided with tapered recesses or holes 17 for receiving the balls 14, the seat member being fixed to and rotatable in association with an output element 15. A thrust seat member 18 is provided, having a flat surface 19 which is pressed against the balls 14. The ball seat member 16 and the thrust seat member 18 are disposed on opposite sides of the ring plate 12 so as to compress the balls located in the holes 13.

Although not shown in Fig. 5, the thrust seat member 18 is always pressed against the balls 14 by a spring, so that when the output element is subjected to a torque which surpasses a certain limit, the balls ride out of the tapered holes 17 and roll around on the ball seat member 16. Thus, an excessive load is prevented from being transmitted back to the input element from the output element.

Incidentally, as shown in Fig. 5, in a conventional torque limiter, the surface of the ball seat member 16 and the surface of the thrust seat member 18, against both of which the balls are pressed, are so flat that there is a problem that the two surfaces are apt to be worn down by the friction and pressure which always act between the balls and the surfaces.

Under the circumstances, it is an object of the invention to provide a torque limiter which does not wear down due to the friction and the pressure between the balls and the surfaces of the two seats, and which possesses excellent wear-resistance. It is another object of the invention to provide a torque limiter which allows an acting torque to be always constant, even when an excessive load is applied to the output element and the transmission of rotation is stopped.

According to the present invention, there is provided a torque limiter, including first and second elements, one of which is an input element and the other of which is an output element, a ring plate provided with holes within which balls are located, the ring plate being rotatable in association with the first element, a ball seat provided with tapered holes or recesses for receiving the balls, the ball seat being fixed to and rotatable in association with the second element, and a thrust seat having a flat surface which is pressed against the bails, the ball seat and the thrust seat being disposed on opposite sides of the ring plate so as to compress the balls located in the holes in the ring plate, wherein at least one of the surfaces of said ball seat and said thrust seat against which said balls are pressed is provided with a circular groove capable of receiving part of each ball.

In order that the invention may be more readily understood, reference will now be made to the accompanying drawings, wherein: Figure 1 is a longitudinal cross-sectional view of a torque limiter embodying the invention; Figure 2 is an enlarged perspective view of the output element of the torque limiter of Fig.

1; Figure 3 is an enlarged cross-sectional view of the ball seat member of the output element of the torque limiter of Fig. 1; Figure 4 is a perspective view of the thrust seat member of the torque limiter; and Figure 5 is an enlarged cross-sectional view of the essential part of a conventional torque limiter.

In Figs. 1 and 2, a ball-holding ring plate 22 is fitted on a cylindrical input element 21. A plurality or passages of holes 23 are pierced through the ring plate 22 at certain circumferentially spaced positions. An output element 24 and a thrust seat member 25 are fitted on the cylindrical input element in such a way that they hold the ring plate from opposite sides thereof and can rotate freely relative to the input element and ring plate.

The balls 26, whose diameter is greater than the thickness of the ring plate, are held loosely by the pierced holes 23, with one ball in each hole, in order that the balls can rotate freely between the output element 24 and the thrust seat member 25. An array of springs, one of which is shown at 28, is located in compression between the thrust seat member 25 and a ring 27 for receiving the spring, the receiving ring being fixed at one end of the input element 21. Accordingly, the balls 26 are pressed against the output element 24 by the springs 28 with the thrust seat member 25 interposed between the balls and the springs.

As shown in Fig. 3, in the illustrated embodiment of the invention, either one or both sides of the rims of the tapered recesses 30 are rounded into an arcuate form 31 in the rotational direction of the output element. Alternatively, the rims of the tapered recesses may be rounded into an arcuate form around their entire periphery. The rounding of the rims enables the balls to ride out of the recesses more easily. The structure is such that the magnitude of the torque which causes the balls to ride out of the tapered recesses does not change so greatly between the new and used conditions of the torque limiter.

Also, in this embodiment, as shown in Fig.

2, a circular groove 32 having an arcuate cross-section is formed in the surface 29 of the output element against which the balls are pressed, in such a manner that all the tapered recesses 30, which are formed on the same circumference, are linked therewith. Another circular groove 33, having an arcuate crosssection that allows the balls to fit therein, is made in the surface 20 of the thrust seat member 25. These circular grooves 32, 33 are preferably formed in the surfaces of both the output element 24 and the thrust seat member.However, one circular groove in either surface will suffice for helping the balls 26 to ride out of the tapered recesses 30 and roll around in the groove so as to lessen wear of the surface due to friction and pressure, because their contact pressure per unit area of that surface is reduced by virtue of the groove, compared with a conventional torque limiter.

While a load acting on the output element is kept below a certain usual limit, the balls 26 are engaged firmly in the tapered recesses 30.

Therefore, the input element 21 keeps rotating in association with the output element 24, and rotation is transmitted from the input element 21 to the output element. However, when an excessive load acts on the output element, it becomes hard to rotate. If the input element is additionally being driven at this moment, the balls 26 can no longer remain seated in their tapered recesses, and they ride out of their recesses and roll around in and between the two circular grooves 32, 33 on the output element 24 and on the thrust seat member 25. This prevents an unusually great load from being transferred to the input element from the output element.

Since the balls, having ridden out of the tapered recesses, roll around in the circular grooves 32, 33 in this manner, the contact pressure of the balls against the output element and the thrust seat member is greatly reduced in terms of unit area. As a result, wear of the surfaces of the output element and thrust seat due to the friction and the pressure caused by the balls is lessened so substantially that the life of the torque limiter can be prolonged much more than before.

Claims (5)

1. A torque limiter, including first and second elements, one of which is an input element and the other of which is an output element, a ring plate provided with holes within which balls are located, the ring plate being fixed to and rotatable in association with the first element, a ball seat provided with tapered holes or recesses for receiving the balls, the bail seat being fixed to and rotatable in association with the second element, and a thrust seat having a flat surface which is pressed against the balls, the ball seat and the thrust seat being disposed on opposite sides of the ring plate so as to compress the balls located in the holes in the ring plate, wherein at least one of the surfaces of said ball seat and said thrust seat against which said balls are pressed is provided with a circular groove capable Qf receiving part of each ball.
2. A torque limiter according to claim 1, in which said circular groove has an arcuate cross-section.
3. A torque limiter according to claim 1 or 2, in which the rims of said tapered recesses provided in said ball seat are rounded into an arcuate form.
4. A torque limiter as claimed in claim 1, 2 or 3, wherein the first element comprises the input element, the second element comprises the output element, and the ball seat is formed by a surface of the output element.
5. A torque limiter substantially as hereinbefore described with reference to Figs. 1 to 4 of the accompanying drawings.
GB08524363A 1984-10-12 1985-10-02 Coupling torque limiter Expired GB2165899B (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP15475084U JPS6169524U (en) 1984-10-12 1984-10-12
JP15475184U JPS6169525U (en) 1984-10-12 1984-10-12

Publications (3)

Publication Number Publication Date
GB8524363D0 GB8524363D0 (en) 1985-11-06
GB2165899A true GB2165899A (en) 1986-04-23
GB2165899B GB2165899B (en) 1988-06-08

Family

ID=26482954

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08524363A Expired GB2165899B (en) 1984-10-12 1985-10-02 Coupling torque limiter

Country Status (2)

Country Link
DE (1) DE3536392A1 (en)
GB (1) GB2165899B (en)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0531797A1 (en) * 1991-09-13 1993-03-17 Sobhy Labib Girguis Overload coupling
GB2275745A (en) * 1993-03-04 1994-09-07 John Constantine Grey Torque overload limiter
US7228752B2 (en) * 2005-03-22 2007-06-12 Kwang Yang Motor Co., Ltd. Structure of a gearbox for all terrain vehicles
US20080196991A1 (en) * 2007-02-20 2008-08-21 Eppard Erin F Clutch for injury mitigation system for power tools
WO2010096672A1 (en) * 2009-02-20 2010-08-26 Swagelok Company Conduit fitting with torque collar
US7922591B2 (en) * 2008-07-22 2011-04-12 Air Motion Systems, Inc. Shutter clutch
US8398124B2 (en) 2006-11-02 2013-03-19 Mark A. Bennett Pull-up by torque fitting
US8439407B2 (en) 2004-04-22 2013-05-14 Swagelok Company Conduit fitting with pull-up indication
US8960728B2 (en) 2009-02-20 2015-02-24 Swagelok Company Conduit fitting with split torque collar
US9958097B2 (en) 2010-07-09 2018-05-01 Swagelok Company Conduit fitting with flexible torque collar
US10024468B2 (en) 2014-05-09 2018-07-17 Swagelok Company Conduit fitting with components adapted for facilitating assembly

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3926208A1 (en) * 1989-08-08 1991-02-14 Mayr Christian Gmbh & Co Kg Overload clutch with two halves - has saddle-shaped transition section between individual spherical indents, peripherally convex and radially concave
CN102635282A (en) * 2012-04-24 2012-08-15 力帆实业(集团)股份有限公司 Rotation limiting mechanism

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB923539A (en) * 1960-11-16 1963-04-10 Bahco Ab Torque-limiting device
GB979487A (en) * 1960-04-14 1965-01-06 Fisher & Ludlow Ltd A new or improved overload clutch or torque limiting device
GB1049525A (en) * 1962-06-30 1966-11-30 Fisher & Ludlow Ltd A new or improved overload clutch or torque limiting device
GB1415138A (en) * 1973-06-05 1975-11-26 Bilz O Bilz Werkzeugfabrik Ott Screw-thread tapping chucks with uncoupling means responsive to torque overloads
GB1517692A (en) * 1974-06-13 1978-07-12 Gib Precision Ltd Torque limiting clutch
GB2000559A (en) * 1977-06-30 1979-01-10 Walterscheid Gmbh Jean Torque limiting clutches
GB2060339A (en) * 1978-01-31 1981-05-07 Lely Nv C Van Der Overload clutches
GB2064682A (en) * 1979-12-12 1981-06-17 Hilti Ag Friction clutch for transmitting limited torque

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1762810U (en) * 1955-03-23 1958-03-06 Jean Walterscheid Fa Drehmomentbegrenzugskupplung.
DE1155943B (en) * 1956-07-13 1963-10-17 Auxiliaire D Ind Sadi S P R L Overload clutch for waves
US3263451A (en) * 1964-03-23 1966-08-02 Hayes Steel Products Ltd Torque overload control device
DE1761856A1 (en) * 1968-07-15 1971-09-02 Feldmuehle Ag Apparatus for producing Flaechengebilden
DE2544919A1 (en) * 1975-10-07 1977-04-21 Mayr Maschf Kg Chr Torque overload coupling for axially aligned sleeves - has diametrally opposite balls spring biased in recesses of coupled flanges

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB979487A (en) * 1960-04-14 1965-01-06 Fisher & Ludlow Ltd A new or improved overload clutch or torque limiting device
GB923539A (en) * 1960-11-16 1963-04-10 Bahco Ab Torque-limiting device
GB1049525A (en) * 1962-06-30 1966-11-30 Fisher & Ludlow Ltd A new or improved overload clutch or torque limiting device
GB1415138A (en) * 1973-06-05 1975-11-26 Bilz O Bilz Werkzeugfabrik Ott Screw-thread tapping chucks with uncoupling means responsive to torque overloads
GB1517692A (en) * 1974-06-13 1978-07-12 Gib Precision Ltd Torque limiting clutch
GB2000559A (en) * 1977-06-30 1979-01-10 Walterscheid Gmbh Jean Torque limiting clutches
GB2060339A (en) * 1978-01-31 1981-05-07 Lely Nv C Van Der Overload clutches
GB2064682A (en) * 1979-12-12 1981-06-17 Hilti Ag Friction clutch for transmitting limited torque

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0531797A1 (en) * 1991-09-13 1993-03-17 Sobhy Labib Girguis Overload coupling
GB2275745A (en) * 1993-03-04 1994-09-07 John Constantine Grey Torque overload limiter
GB2275745B (en) * 1993-03-04 1996-01-24 John Constantine Grey Overload torque limiter
US10316998B2 (en) 2004-04-22 2019-06-11 Swagelok Company Conduit fitting subassembly and retaining tool
US8439407B2 (en) 2004-04-22 2013-05-14 Swagelok Company Conduit fitting with pull-up indication
US7228752B2 (en) * 2005-03-22 2007-06-12 Kwang Yang Motor Co., Ltd. Structure of a gearbox for all terrain vehicles
US9611961B2 (en) 2006-11-02 2017-04-04 Swagelok Company Pull-up by torque fitting with female threaded nut and integral dynamic wedge
US8398124B2 (en) 2006-11-02 2013-03-19 Mark A. Bennett Pull-up by torque fitting
US10344898B2 (en) 2006-11-02 2019-07-09 Swagelok Company Pull-up by torque fitting with female threaded nut and integral dynamic wedge
US20080196991A1 (en) * 2007-02-20 2008-08-21 Eppard Erin F Clutch for injury mitigation system for power tools
US8844696B2 (en) * 2007-02-20 2014-09-30 Robert Bosch Gmbh Clutch for injury mitigation system for power tools
US7922591B2 (en) * 2008-07-22 2011-04-12 Air Motion Systems, Inc. Shutter clutch
WO2010096672A1 (en) * 2009-02-20 2010-08-26 Swagelok Company Conduit fitting with torque collar
US9851032B2 (en) 2009-02-20 2017-12-26 Swagelok Company Conduit fitting with torque collar
US8960728B2 (en) 2009-02-20 2015-02-24 Swagelok Company Conduit fitting with split torque collar
US9297481B2 (en) 2009-02-20 2016-03-29 Swagelok Company Conduit fitting with torque collar
US9958097B2 (en) 2010-07-09 2018-05-01 Swagelok Company Conduit fitting with flexible torque collar
US10024468B2 (en) 2014-05-09 2018-07-17 Swagelok Company Conduit fitting with components adapted for facilitating assembly

Also Published As

Publication number Publication date
GB2165899B (en) 1988-06-08
GB8524363D0 (en) 1985-11-06
DE3536392A1 (en) 1986-04-17

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19961002