CA1116111A - Friction-type torque limiter - Google Patents
Friction-type torque limiterInfo
- Publication number
- CA1116111A CA1116111A CA312,205A CA312205A CA1116111A CA 1116111 A CA1116111 A CA 1116111A CA 312205 A CA312205 A CA 312205A CA 1116111 A CA1116111 A CA 1116111A
- Authority
- CA
- Canada
- Prior art keywords
- members
- driving
- friction
- driven
- torque limiter
- 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.)
- Expired
Links
- 230000005540 biological transmission Effects 0.000 claims abstract description 28
- 229910000881 Cu alloy Inorganic materials 0.000 claims 2
- 239000000543 intermediate Substances 0.000 claims 1
- 239000000956 alloy Substances 0.000 abstract description 8
- 229910045601 alloy Inorganic materials 0.000 abstract description 8
- 239000010425 asbestos Substances 0.000 description 4
- 229910052895 riebeckite Inorganic materials 0.000 description 4
- 239000000843 powder Substances 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical group [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 229920003002 synthetic resin Polymers 0.000 description 2
- 239000000057 synthetic resin Substances 0.000 description 2
- 230000005855 radiation Effects 0.000 description 1
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
- F16D7/00—Slip couplings, e.g. slipping on overload, for absorbing shock
- F16D7/02—Slip couplings, e.g. slipping on overload, for absorbing shock of the friction type
- F16D7/024—Slip couplings, e.g. slipping on overload, for absorbing shock of the friction type with axially applied torque limiting friction surfaces
-
- 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
- F16D69/00—Friction linings; Attachment thereof; Selection of coacting friction substances or surfaces
- F16D69/02—Composition of linings ; Methods of manufacturing
- F16D69/027—Compositions based on metals or inorganic oxides
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Mechanical Operated Clutches (AREA)
- Transmission Devices (AREA)
- One-Way And Automatic Clutches, And Combinations Of Different Clutches (AREA)
- Powder Metallurgy (AREA)
- Agricultural Machines (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A frictional torque limiter for determining the maximum value of torque to be transmitted between driving-side and driven-side frictional transmission members includes a facing member having copper-type sintered alloy friction surfaces disposed intermediate the transmission members. Means are provided for elastically holding the facing member in frictionally engaging relation with the trans-mission members, such means also mechanically linking the driving-side members to prevent rotation therebetween and permitting relative sliding motion between the driving-side, driven-side and facing members to predetermine the torque output.
A frictional torque limiter for determining the maximum value of torque to be transmitted between driving-side and driven-side frictional transmission members includes a facing member having copper-type sintered alloy friction surfaces disposed intermediate the transmission members. Means are provided for elastically holding the facing member in frictionally engaging relation with the trans-mission members, such means also mechanically linking the driving-side members to prevent rotation therebetween and permitting relative sliding motion between the driving-side, driven-side and facing members to predetermine the torque output.
Description
i~611~
The present invention relates to a torque limiter having facing members that are elastically held between driving-side frictional transmission members and driven-side frictional transmission members.
Conventionally, asbestos or asbestos coated with synthetic resin of the epoxy-type has been used for facing members in torque limiters. In such cases, however, the torque limiters have proven to be inconvenient since the maximum value of torque to be transmitted is not easily determined. Thus, when asbestos facing members are used, close contact between the facing members and transmission members may not be obtained. Accordingly, a predetermined coefficient of friction is not easily provided with initial use and abrasive powder lS readily produced during such use. After a predetermined period of time, the coefficient of friction of the facing members will be sharply reduced due to this abrasive powder, thereby changing considerably the maximum value of torque to be transmitted.
on the other hand, when facing members of asbestos coated with synthetic resin are used, such facing members are susceptible to influencesarising from friction heating, thus making it difficult to obtain a stable co-efficient of friction for the facing members.
In view of the above, the present invention provides a friction-type torque limiter in which the co-efficient of friction of facing members may be stabilized so as to stabilize the maximum value of torque to be transmitted, thus enabling continuously stable transmission operations.
In accordance with one aspect of the present 1~6~1.1 invention, the friction-type torque limiter comprises a driving-side frictional transmission member, a driven-side frictional transmission member, a facing member having copper-type sintered alloy friction surfaces disposed in-termediate the transmission members, and means for elas-tically holding the facing member in frictionally engaging relation with the transmission members.
In accordance with a second aspect of the in-vention, the friction-type torque limiter comprises a plurality of driving-side frictional -transmission members disposed unlformly in spaced apart relation, a plurality of driven-side frictional transmission members, individual ones of which being disposed intermediate adjacent pairs of the driving-side frictional transmission members, a plurality of facing members having copper-type sintered alloy friction surfaces,individual ones of the facing members being disposed intermediate adjacent pairs of the driving-side and driven-side frictional transmission members and means for elas-tically holding the facing members in frictionally engaging relation with said transmission members.
The present lnvention thus provides the following advantages which are derived from the copper-type sintered alloy~
close contact between the facing members and the transmission members may be obtained at an early stage of use;
less abrasive powder is produced; and less influence from friction heating is exerted because of an excellent heat radiation property of the alloy.
The coefficient of friction of the facing members 1~16~11 may therefore be stabilized, thus providing continuously stable transmission operations.
It is a main object of the present invention to provide an economically constructed friction-type torque limiter.
Other objects and further advantages of the present invention will be apparent from the following description.
The invention will now be more particularly described with reference to en~odiments thereof shown, by way of example, in the accompanying drawings, in which:
Fig. 1 is a longitudinal section view of a first embodiment of a friction-type torque limiter in accordance with the present invention;
Fig. 2 is a longitudinal section view of a second embodiment of the present invention; and Fig. 3 is a view taken from the line III-III in Fig. 2.
The description hereinbelow discusses in detail the preferred embodiments of the present invention.
Fig. 1 illustrates a friction-type torque limiter in accordance with the present invention. It will be ob~erved that the limiter is disposed between a universal joint 1 adapted to be interlockingly connected to a power takeoff shaft (not shown) of an agricultural tractor (not shown), and an input shaft 2 of an attached working machine, such as a rotary cultivator, adapted to be connected to and supported by the tractor.
In this friction-type torque limiter, a first driving-side frictional transmission men~ber, hereinafter referred to as a first plate 3, is formed in a disk shape integrally with the universal joint 1. The plate 3 is in contact with one side of a driven-side, disk-shaped frictional transmission member, hereinafter referred to as a driven plate 4, through a first facing member 5. It will be observed that the plate 4 is connected to the shaft 2 by means of a splined connection therebetween. A
second driving-side frictional transmission member, here-inafter referred to as a second plate 7, is disk-shaped and is in contact with the other side of the driven plate 4 through a second facing member 8, thc second plate 7 being perforated and supported by a plurality of bolts 6 passing through the perforations and through like perforations in the first plate 3.
Springs 9 are disposed between the first plate 3 and washers 11 supported by nuts 10 which are threadedly connected to the bolts 6.
The facing members 5 and 8 may therefore be elastically held between the first plate 3 and the driven plate 4, and between the driven plate 4 and the second plate 7, respectively, by pulling or drawing the second plate 7 toward the first plate 3 with the bolts 6 and nuts 10 .
With such an arrangement, power transmission is provided by friction, and when an overload exceeding a predetermined value is applied to the attached working machine, power transmission is stopped by relative rotary sliding of the plates 3, 4 and 7, thus preventing damage to the attached working machine or exerting an excessive strain upon the tractor.
1~1611~
Those faces ofthe plates 3,4 and 7 which are opposite the facing members 5 and 8, are being carburized, and the facing members 5 and 8 are provided at both sides of each of annular-shaped members 5a and 8a disposed at the inner portion thereof, with linings 5b and 8b made of a sintered alloy of which the main component is copper.
Figs. 2 and 3 illustrate a second embodiment of the present invention in which the friction-type torque limiter shown in Fig. l is modified to the form of a multiple-plate type.
Three driven plates 12 are splined to the input shaft 2. Two driving plates 13 are disposed between the first plate 3 and the second plate 7, with the bolts 6 passing through suitable perforations in the driving plates 13. Six facing members 14 are interspersed between the plates 3, 12, 13 and 7 as shown in Fig. 2.
Similar to the first embodiment, linings 14_ are made of a sintered alloy of which the main component is copper and are applied to both sides of each of annular-shaped members 14a at the inner portions of the facingmembers 14.
In this multiple-plate, friction-type torque limiter, the bolts 6 perform a function of supporting or mechanically linking the first plate 3, the second plate 7 and the driving plates 13 to prevent relative rotation therebetween. The bolts 6 also function as means for pulling or drawing the plates 7 and 13 toward the first plate 3 in order to elastically hold the facing members 14 therebetween. Such an arrangement may therefore be con-structed more economically and easily as compared with lS~
an arrangement in which means for supporting the drivingplates to prevent relative rotation therebetween, and plate-pulling means are separately provided.
In accordance with the present invention, it may also be possible to make all of the facing members of a copper-type sintered alloy.
The present invention relates to a torque limiter having facing members that are elastically held between driving-side frictional transmission members and driven-side frictional transmission members.
Conventionally, asbestos or asbestos coated with synthetic resin of the epoxy-type has been used for facing members in torque limiters. In such cases, however, the torque limiters have proven to be inconvenient since the maximum value of torque to be transmitted is not easily determined. Thus, when asbestos facing members are used, close contact between the facing members and transmission members may not be obtained. Accordingly, a predetermined coefficient of friction is not easily provided with initial use and abrasive powder lS readily produced during such use. After a predetermined period of time, the coefficient of friction of the facing members will be sharply reduced due to this abrasive powder, thereby changing considerably the maximum value of torque to be transmitted.
on the other hand, when facing members of asbestos coated with synthetic resin are used, such facing members are susceptible to influencesarising from friction heating, thus making it difficult to obtain a stable co-efficient of friction for the facing members.
In view of the above, the present invention provides a friction-type torque limiter in which the co-efficient of friction of facing members may be stabilized so as to stabilize the maximum value of torque to be transmitted, thus enabling continuously stable transmission operations.
In accordance with one aspect of the present 1~6~1.1 invention, the friction-type torque limiter comprises a driving-side frictional transmission member, a driven-side frictional transmission member, a facing member having copper-type sintered alloy friction surfaces disposed in-termediate the transmission members, and means for elas-tically holding the facing member in frictionally engaging relation with the transmission members.
In accordance with a second aspect of the in-vention, the friction-type torque limiter comprises a plurality of driving-side frictional -transmission members disposed unlformly in spaced apart relation, a plurality of driven-side frictional transmission members, individual ones of which being disposed intermediate adjacent pairs of the driving-side frictional transmission members, a plurality of facing members having copper-type sintered alloy friction surfaces,individual ones of the facing members being disposed intermediate adjacent pairs of the driving-side and driven-side frictional transmission members and means for elas-tically holding the facing members in frictionally engaging relation with said transmission members.
The present lnvention thus provides the following advantages which are derived from the copper-type sintered alloy~
close contact between the facing members and the transmission members may be obtained at an early stage of use;
less abrasive powder is produced; and less influence from friction heating is exerted because of an excellent heat radiation property of the alloy.
The coefficient of friction of the facing members 1~16~11 may therefore be stabilized, thus providing continuously stable transmission operations.
It is a main object of the present invention to provide an economically constructed friction-type torque limiter.
Other objects and further advantages of the present invention will be apparent from the following description.
The invention will now be more particularly described with reference to en~odiments thereof shown, by way of example, in the accompanying drawings, in which:
Fig. 1 is a longitudinal section view of a first embodiment of a friction-type torque limiter in accordance with the present invention;
Fig. 2 is a longitudinal section view of a second embodiment of the present invention; and Fig. 3 is a view taken from the line III-III in Fig. 2.
The description hereinbelow discusses in detail the preferred embodiments of the present invention.
Fig. 1 illustrates a friction-type torque limiter in accordance with the present invention. It will be ob~erved that the limiter is disposed between a universal joint 1 adapted to be interlockingly connected to a power takeoff shaft (not shown) of an agricultural tractor (not shown), and an input shaft 2 of an attached working machine, such as a rotary cultivator, adapted to be connected to and supported by the tractor.
In this friction-type torque limiter, a first driving-side frictional transmission men~ber, hereinafter referred to as a first plate 3, is formed in a disk shape integrally with the universal joint 1. The plate 3 is in contact with one side of a driven-side, disk-shaped frictional transmission member, hereinafter referred to as a driven plate 4, through a first facing member 5. It will be observed that the plate 4 is connected to the shaft 2 by means of a splined connection therebetween. A
second driving-side frictional transmission member, here-inafter referred to as a second plate 7, is disk-shaped and is in contact with the other side of the driven plate 4 through a second facing member 8, thc second plate 7 being perforated and supported by a plurality of bolts 6 passing through the perforations and through like perforations in the first plate 3.
Springs 9 are disposed between the first plate 3 and washers 11 supported by nuts 10 which are threadedly connected to the bolts 6.
The facing members 5 and 8 may therefore be elastically held between the first plate 3 and the driven plate 4, and between the driven plate 4 and the second plate 7, respectively, by pulling or drawing the second plate 7 toward the first plate 3 with the bolts 6 and nuts 10 .
With such an arrangement, power transmission is provided by friction, and when an overload exceeding a predetermined value is applied to the attached working machine, power transmission is stopped by relative rotary sliding of the plates 3, 4 and 7, thus preventing damage to the attached working machine or exerting an excessive strain upon the tractor.
1~1611~
Those faces ofthe plates 3,4 and 7 which are opposite the facing members 5 and 8, are being carburized, and the facing members 5 and 8 are provided at both sides of each of annular-shaped members 5a and 8a disposed at the inner portion thereof, with linings 5b and 8b made of a sintered alloy of which the main component is copper.
Figs. 2 and 3 illustrate a second embodiment of the present invention in which the friction-type torque limiter shown in Fig. l is modified to the form of a multiple-plate type.
Three driven plates 12 are splined to the input shaft 2. Two driving plates 13 are disposed between the first plate 3 and the second plate 7, with the bolts 6 passing through suitable perforations in the driving plates 13. Six facing members 14 are interspersed between the plates 3, 12, 13 and 7 as shown in Fig. 2.
Similar to the first embodiment, linings 14_ are made of a sintered alloy of which the main component is copper and are applied to both sides of each of annular-shaped members 14a at the inner portions of the facingmembers 14.
In this multiple-plate, friction-type torque limiter, the bolts 6 perform a function of supporting or mechanically linking the first plate 3, the second plate 7 and the driving plates 13 to prevent relative rotation therebetween. The bolts 6 also function as means for pulling or drawing the plates 7 and 13 toward the first plate 3 in order to elastically hold the facing members 14 therebetween. Such an arrangement may therefore be con-structed more economically and easily as compared with lS~
an arrangement in which means for supporting the drivingplates to prevent relative rotation therebetween, and plate-pulling means are separately provided.
In accordance with the present invention, it may also be possible to make all of the facing members of a copper-type sintered alloy.
Claims (5)
EXCLUSIVE PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED
AS FOLLOWS:
1. A friction-type torque limiter comprising at least two driving-side frictional transmission members positioned in juxtaposed relation and urged together for common rotation with no relative rotation therebetween, a driven-side frictional transmission member interposed between adjacent pairs of the driving-side frictional transmission members and a facing member interposed between the facing surfaces of adjacent driving-side and driven side members with each facing member being an independent element separable from said driving-side and driven-side members and having opposite working surfaces formed of sintered copper alloy.
2. A friction-type torque limiter as claimed in Claim 1 wherein said driving-side frictional transmission members include a plurality of perforations and are sup-ported for no relative rotation by bolt means disposed in said perforations, said driving-side members being urged together by spring means mounted on said bolt means inter-mediate one end thereof and an outermost one of said driving-side members.
3. A friction-type torque limiter as claimed in Claim 2 wherein said limiter is a single plate type limiter comprising one driven-side frictional transmission member.
4. A friction-type torque limiter as claimed in Claim 2 wherein said limiter is a plural plate type limiter comprising a plurality of driven-side frictional transmission members.
5. A friction-type torque limiter as claimed in Claim 3 or 4 wherein said facing members are entirely made of sintered copper alloy.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14862577A JPS5481450A (en) | 1977-12-09 | 1977-12-09 | Frictional type torque limiter |
| JP148625 | 1977-12-09 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1116111A true CA1116111A (en) | 1982-01-12 |
Family
ID=15456962
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA312,205A Expired CA1116111A (en) | 1977-12-09 | 1978-09-27 | Friction-type torque limiter |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JPS5481450A (en) |
| CA (1) | CA1116111A (en) |
| DE (1) | DE2846884A1 (en) |
| FR (1) | FR2411333A1 (en) |
| GB (1) | GB2009885A (en) |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6115312Y2 (en) * | 1980-01-22 | 1986-05-13 | ||
| DE3013893A1 (en) * | 1980-04-10 | 1982-01-28 | Robert Bosch Gmbh, 7000 Stuttgart | COUPLING FOR ROTATABLE PARTS |
| FR2484517A1 (en) * | 1980-06-13 | 1981-12-18 | Equibatir | Electrically operated door actuator with adjustable safety torque - uses friction clutch carried between spring positioned plates with screw position adjustment to give adjustable limit torque on clutch |
| DE3044679C2 (en) * | 1980-11-27 | 1984-03-22 | Jean Walterscheid Gmbh, 5204 Lohmar | Friction clutch |
| US4645472A (en) * | 1981-03-06 | 1987-02-24 | Power Transmission Technology, Inc. | Torque limiting clutch |
| US5028211A (en) * | 1989-02-24 | 1991-07-02 | The Carborundum Company | Torque coupling system |
| DE4411641A1 (en) * | 1994-04-02 | 1995-10-05 | Krebsoege Gmbh Sintermetall | clutch |
| JP4609973B2 (en) * | 2001-02-02 | 2011-01-12 | 株式会社ショーワ | Electric power steering device |
| CN101846142A (en) * | 2010-05-31 | 2010-09-29 | 重庆长安汽车股份有限公司 | Limited-torque wet clutch used for hybrid electric vehicle |
| CN103644207A (en) * | 2013-11-21 | 2014-03-19 | 苏州蓝王机床工具科技有限公司 | Vibrating screen coupler |
| US10876580B2 (en) * | 2016-11-30 | 2020-12-29 | Saint-Gobain Performance Plastics Pampus Gmbh | Torque control system |
| CN114483817B (en) * | 2021-11-23 | 2024-02-27 | 株洲时代新材料科技股份有限公司 | Torque limiter and assembly method thereof |
| CN114939748A (en) * | 2022-07-04 | 2022-08-26 | 青岛维特智能装备有限公司 | Automatic nozzle replacing device of laser cutting machine |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR968842A (en) * | 1947-05-06 | 1950-12-06 | Bendix Aviat Corp | Improvements to torque limiting devices |
| US2977779A (en) * | 1959-01-29 | 1961-04-04 | Elenco Products Corp | Torque limiter |
| US3090213A (en) * | 1961-10-13 | 1963-05-21 | Daco Inc | Torque limiter |
| GB1262643A (en) * | 1968-05-10 | 1972-02-02 | Plessey Co Ltd | Improvements in or relating to clutches |
| CH567674A5 (en) * | 1973-11-19 | 1975-10-15 | Kopp Jean E |
-
1977
- 1977-12-09 JP JP14862577A patent/JPS5481450A/en active Pending
-
1978
- 1978-09-22 GB GB7837893A patent/GB2009885A/en not_active Withdrawn
- 1978-09-27 CA CA312,205A patent/CA1116111A/en not_active Expired
- 1978-09-29 FR FR7828046A patent/FR2411333A1/en active Granted
- 1978-10-27 DE DE19782846884 patent/DE2846884A1/en not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5481450A (en) | 1979-06-28 |
| GB2009885A (en) | 1979-06-20 |
| DE2846884A1 (en) | 1979-06-13 |
| FR2411333A1 (en) | 1979-07-06 |
| FR2411333B1 (en) | 1983-11-18 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |