CA2614413A1 - Magnetic friction clutch - Google Patents
Magnetic friction clutch Download PDFInfo
- Publication number
- CA2614413A1 CA2614413A1 CA 2614413 CA2614413A CA2614413A1 CA 2614413 A1 CA2614413 A1 CA 2614413A1 CA 2614413 CA2614413 CA 2614413 CA 2614413 A CA2614413 A CA 2614413A CA 2614413 A1 CA2614413 A1 CA 2614413A1
- Authority
- CA
- Canada
- Prior art keywords
- disc
- magnetic
- friction
- output shaft
- discs
- 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.)
- Abandoned
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
- F16D27/00—Magnetically- or electrically- actuated clutches; Control or electric circuits therefor
- F16D27/10—Magnetically- or electrically- actuated clutches; Control or electric circuits therefor with an electromagnet not rotating with a clutching member, i.e. without collecting rings
- F16D27/108—Magnetically- or electrically- actuated clutches; Control or electric circuits therefor with an electromagnet not rotating with a clutching member, i.e. without collecting rings with axially movable clutching members
- F16D27/112—Magnetically- or electrically- actuated clutches; Control or electric circuits therefor with an electromagnet not rotating with a clutching member, i.e. without collecting rings with axially movable clutching members with flat friction surfaces, e.g. discs
- F16D27/115—Magnetically- or electrically- actuated clutches; Control or electric circuits therefor with an electromagnet not rotating with a clutching member, i.e. without collecting rings with axially movable clutching members with flat friction surfaces, e.g. discs with more than two discs, e.g. multiple lamellae
-
- 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
- F16D27/00—Magnetically- or electrically- actuated clutches; Control or electric circuits therefor
- F16D2027/008—Details relating to the magnetic circuit, or to the shape of the clutch parts to achieve a certain magnetic path
Abstract
A novel magnetic friction clutch is disclosed which is capable of relatively high torque transfer for friction discs of a given diameter, compared to prior art magnetic clutches. A friction coating with good magnetic permeability, such as Ferrous Aluminide or the like, is applied to inner and outer annular regions of the three friction discs and increases the frictional coefficient of the discs with little reduction in the clamping force developed through the clutch.
Claims (14)
1. A magnetic friction clutch, comprising:
a driving gear to receive torque from a prime mover;
an output shaft to output torque from the prime mover to a driven device when the clutch is engaged;
three friction discs:
a first disc of the three friction discs being a first driving disc, each driving disc rotating with the drive gear and being moveable along the output shaft;
a second disc of the friction discs being a first driven disc, each driven disc rotating with the output shaft; and a third disc of the friction discs being one of a second driven disc or second driving disc, where each friction disc includes a frictional coating applied to its surfaces to enhance the frictional coefficient between respective discs;
and a magnetic circuit including an electromagnetic coil operable, when energized, to clamp the three friction discs together to allow torque to be transferred from a prime mover to a driven device through the friction discs.
a driving gear to receive torque from a prime mover;
an output shaft to output torque from the prime mover to a driven device when the clutch is engaged;
three friction discs:
a first disc of the three friction discs being a first driving disc, each driving disc rotating with the drive gear and being moveable along the output shaft;
a second disc of the friction discs being a first driven disc, each driven disc rotating with the output shaft; and a third disc of the friction discs being one of a second driven disc or second driving disc, where each friction disc includes a frictional coating applied to its surfaces to enhance the frictional coefficient between respective discs;
and a magnetic circuit including an electromagnetic coil operable, when energized, to clamp the three friction discs together to allow torque to be transferred from a prime mover to a driven device through the friction discs.
2. The magnetic friction clutch of claim 1 wherein the frictional coating is Ferrous Aluminide.
3. The magnetic friction clutch of claim 2 wherein the frictional coating is applied by thermal spraying.
4. The magnetic friction clutch of claim 2 wherein the third disc is a second driving disc.
5. The magnetic friction clutch of claim 2 further comprising a rotor which turns with the output shaft and an armature which turns with the driving gear, the rotor making frictional contact with the frictional coating of one of the first driving disc and the armature making frictional contact with the second driving disc when the magnetic circuit is energized.
6. The magnetic friction clutch of claim 2 wherein each of the three friction discs includes an outer annular region separated from an inner annular region by at least two air gaps, the area of the outer annular region being substantially the same as the area of the inner annular region.
7. The magnetic friction clutch of claim 6 wherein the friction coating is applied to the outer annular area and the inner annular area.
8. The magnetic friction clutch of claim 2 wherein each driving disc includes a set of radially outwardly extending tabs to engage the driving gear.
9. The magnetic friction clutch of claim 2 wherein each driven disc includes a set of radially inwardly extending index features to engage a set of complementary index features on the output shaft.
10. The magnetic friction clutch of claim 5 further comprising a magnetic core wherein the electromagnetic coil is located in an annular recess formed between the rotor and the magnetic core.
11. The magnetic clutch of claim 5 wherein the frictional coating is also applied to the surfaces of the rotor and armature which contact the driving discs.
12. A magnetic friction clutch, comprising:
a driving gear to receive torque from a prime mover;
an output shaft to output torque from the prime mover to a driven device when the clutch is engaged;
three friction discs, each friction disc having an outer annular region separated from an inner annular region by at least two air gaps, the area of the outer annular region being substantially the same as the area of the inner annular region and wherein a frictional coating is applied to at least the inner annular area and outer annular area of each friction disc:
a first disc of the three friction discs being a first driving disc rotating with the drive gear and being moveable along the output shaft;
a second disc of the friction discs being a first driven disc rotating with the output shaft being moveable along the output shaft; and a third disc of the friction discs being a second driving disc rotating with the drive gear and being moveable along the output shaft;
a rotor which turns with the output shaft;
an armature which turns with the driving gear;
a magnetic core; and a magnetic circuit including an electromagnetic coil located within an annular recess formed between the rotor and the magnetic core, the electromagnetic coil being operable, when energized, to clamp the three friction discs and the armature and rotor together to allow torque to be transferred from a prime mover to a driven device through the friction discs.
a driving gear to receive torque from a prime mover;
an output shaft to output torque from the prime mover to a driven device when the clutch is engaged;
three friction discs, each friction disc having an outer annular region separated from an inner annular region by at least two air gaps, the area of the outer annular region being substantially the same as the area of the inner annular region and wherein a frictional coating is applied to at least the inner annular area and outer annular area of each friction disc:
a first disc of the three friction discs being a first driving disc rotating with the drive gear and being moveable along the output shaft;
a second disc of the friction discs being a first driven disc rotating with the output shaft being moveable along the output shaft; and a third disc of the friction discs being a second driving disc rotating with the drive gear and being moveable along the output shaft;
a rotor which turns with the output shaft;
an armature which turns with the driving gear;
a magnetic core; and a magnetic circuit including an electromagnetic coil located within an annular recess formed between the rotor and the magnetic core, the electromagnetic coil being operable, when energized, to clamp the three friction discs and the armature and rotor together to allow torque to be transferred from a prime mover to a driven device through the friction discs.
13. A magnetic friction clutch according to claim 12 wherein the frictional coating is also applied to the rotor and the armature.
14. A magnetic friction clutch according to claim 12 wherein the frictional coating is Ferrous Aluminide.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US87495306P | 2006-12-15 | 2006-12-15 | |
| US60/874,953 | 2006-12-15 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2614413A1 true CA2614413A1 (en) | 2008-06-15 |
Family
ID=39465980
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2614413 Abandoned CA2614413A1 (en) | 2006-12-15 | 2007-12-13 | Magnetic friction clutch |
Country Status (2)
| Country | Link |
|---|---|
| CA (1) | CA2614413A1 (en) |
| DE (1) | DE102007060524A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20180119610A1 (en) * | 2015-05-20 | 2018-05-03 | Eaton Corporation | Modular and serviceable electromagnetic clutch assembly |
-
2007
- 2007-12-13 DE DE200710060524 patent/DE102007060524A1/en not_active Withdrawn
- 2007-12-13 CA CA 2614413 patent/CA2614413A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| DE102007060524A1 (en) | 2008-07-03 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Dead |
Effective date: 20150515 |