GB2032548A - Electromagnetically releasable spring-actuated segmented disc brake - Google Patents
Electromagnetically releasable spring-actuated segmented disc brake Download PDFInfo
- Publication number
- GB2032548A GB2032548A GB7932710A GB7932710A GB2032548A GB 2032548 A GB2032548 A GB 2032548A GB 7932710 A GB7932710 A GB 7932710A GB 7932710 A GB7932710 A GB 7932710A GB 2032548 A GB2032548 A GB 2032548A
- Authority
- GB
- United Kingdom
- Prior art keywords
- brake
- disc
- yoke
- plates
- axially
- 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.)
- Withdrawn
Links
- 238000006073 displacement reaction Methods 0.000 claims description 4
- 238000010137 moulding (plastic) Methods 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000003475 lamination Methods 0.000 description 2
- 230000010355 oscillation Effects 0.000 description 2
- 230000000737 periodic effect Effects 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000011089 mechanical engineering Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 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
- F16D55/00—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes
- F16D55/24—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with a plurality of axially-movable discs, lamellae, or pads, pressed from one side towards an axially-located member
- F16D55/26—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with a plurality of axially-movable discs, lamellae, or pads, pressed from one side towards an axially-located member without self-tightening action
- F16D55/28—Brakes with only one rotating disc
-
- 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
- F16D59/00—Self-acting brakes, e.g. coming into operation at a predetermined speed
- F16D59/02—Self-acting brakes, e.g. coming into operation at a predetermined speed spring-loaded and adapted to be released by mechanical, fluid, or electromagnetic means
-
- 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
- F16D55/00—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes
- F16D2055/0004—Parts or details of disc brakes
-
- 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
- F16D55/00—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes
- F16D2055/0004—Parts or details of disc brakes
- F16D2055/0062—Partly lined, i.e. braking surface extending over only a part of the disc circumference
-
- 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
- F16D2121/00—Type of actuator operation force
- F16D2121/18—Electric or magnetic
- F16D2121/20—Electric or magnetic using electromagnets
- F16D2121/22—Electric or magnetic using electromagnets for releasing a normally applied brake
Abstract
An electromagnetically releasable spring-actuated disc brake comprises at least one brake disc (10) mounted on a shaft (20) to be braked and at least one axially displaceable brake plate (as shown, two, 8, 11) which have segmental friction linings (15, 16) and are spring-pressed against the brake disc (10). An E- shaped electromagnetic yoke (4) arranged inside the contour of disc 10 acts on an axially movable armature (7) fixed to (one of) the brake plate(s) (8) and to release the brake, current is passed through a coil (6) on the yoke. <IMAGE>
Description
SPECiFICATION
Electromagnetically releasable spring-actuated segmented disc brake
The invention relates to an electromagnetically releasable spring-actuated segmented disc brake comprising a brake disc which is mounted on a shaft to be braked for rotation therewith, brake plates arranged on both sides of the brake disc and provided with friction linings which cover a segmental area of the brake disc, at least one spring which presses the brake plates against the brake disc, and an electromagnetic releasing device for releasing the brake plates against the force of this spring.
Electromagnetically releasable spring-actuated disc brakes are used as safety brakes in a wide area of mechanical engineering. Actuated by closed-circuit current, the brakes are held open and, in operation, release the shaft to be braked. If the current is interrupted the brake becomes effective by means of spring pressure and stops the shaft.
Such disc brakes are known as segmented disc brakes and as full disc brakes.
The known segmented disc brakes are constructed as jaw brakes having releasing systems which can be operated pneumaticaily, hydraulically, by means of electric motors or with direct-current magnets. In this arrangement the brake jaw with its brake plates extends radially outside and over the brake disc, the brake plates covering a segmental area of the brake disc. The brake jaw is arranged in such a manner that the friction linings rest flat against the friction disc even if they are in an advanced state of wear.
Because of its large constructional voiume, the releasing device is always located outside the periphery of the brake disc because this is the only way of keeping the axial structural dimensions of the machine element to be braked within reasonable limits. In order to be able to arrange the brake plates of these known jaw brakes without unduly extending the machine element axially, the diameter of the brake disc must be increased, as a rule, beyond the machine parts to be braked.
Since in the known jaw brakes the releasing device is always arranged radially outside the brake disc, it is necessary, depending on the type of releasing device, to introduce the releasing force into the brake plates via levers, linkages, pressure lines or the like. This results in disadvantageous deflection losses of the releasing force and necessitates the use of further parts which wear.
If no pneumatic or hydraulic energy supply is available at the place where the brake is to be used, jaw brakes are used which can be operated from the existing alternating current mains. The brakes are then released either by means of electric motors or direct-current lifting magnets, which necessitate an additional power supply unit
Both possibilities are expensive in cost and space requirements so that they can be integrated into the total conception of a machine with difficulty.
In the known full disc brakes the brake plates are arranged concentrically with respect to the shaft to be braked and cover the whole circular area of the brake disc. If an electromagnetic releasing device is provided it is also arranged concentrically with respect to the shaft to be braked, for example as an annular magnet.
Compared with segmented disc brakes, full disc brakes have the disadvantage that the braking moment cannot be changed in the same simple manner. With segmented disc brakes the braking moment can be increased by increasing the segmental area of the friction linings or the radius of the brake disc, without a change in the releasing device being necessary. With full disc brakes an increase in the braking moment is possible only by increasing the radius of the concentric releasing device which leads to an increase in the magnet system and thus to an increased weight and energy requirement.
In contrast to full disc brakes, it is also possible in segmented disc brakes to have one brake disc engaged by several, independent brake systems.
Finally, even with full disc brakes an electromagnetic release can usually be effected only means of direct-current magnets so that additional power supplies or rectifiers are required.
It is an object of the invention to improve a segmented disc brake of the kind mentioned initially, in such a way that it can be easily integrated into the overall concept of a machine, with small axial structural dimensions, so that deflection of the releasing force and additional wearing of parts associated with this deflection, are avoided, and the releasing device can be operated directly with alternating current, if necessary.
According to the invention, there is provided an electromagnetically releasable spring-actuated segmented disc brake comprising a brake disc which is mounted on a shaft to be braked for rotation therewith, brake plates arranged on both sides of the brake disc and provided with friction linings which cover a segmental area of the brake disc, at least one spring which presses the brake plates against the brake disc, and an electromagnetic device for releasing the brake plates against the force of this spring, characterised in that the electromagnetic releasing device includes an E-shaped yoke which is arranged inside the periphery of the brake disc and of the brake plates and adapted to engage one of these brake plates axially, and an armature which is fixed to said one brake plate facing the yoke; and the brake plates and the brake disc are axially displaceable with respect to each other.
In the segmented disc brake according to the invention the electromagnetic releasing device is fuly integrated into the radial contour of the brake disc. In contrast to the customary jaw brakes, the brake thus does not require any increase in the radial structural dimensions. The axial structural dimension of the machine part to be braked, too, is increased only very-little by the brake. The axial dimension is increased only by the axial width of the magnetically active iron of the releasing device, by the thickness of the brake disc which is required in every case, and by the thickness of the brake plates which can be kept quite small.
A further advantage lies in that the axially oriented releasing force is generated directly so that no deflection of the force, with attendant losses in power and additional wearing parts is necessary.
Since there are no deflection losses in the releasing force, the brake according to the invention can work with a relatively small releasing force. Because of this relatively small releasing force, and because the yoke of the magnet can be produced from high-grade magnetic steel sheet as a flat system, a further reduction in the axial structural dimensions is possible.
Finally, the use of-an E-shaped yoke makes it possible to operate the electromagnetic releasing device directly with alternating current. In this context it is particularly advantageous when operating with alternating current, to provide, in the legs of the yoke, short-circuiting rings which prevent periodic oscillations of the armature when alternating current is applied.
Since the brake according to the invention works without force deflection levers, step-down levers for power amplification and similar devices, it has only few components. In addition, these components are predominantly punched-out parts so that the brake can be produced extremely economically.
An embodiment of the invention will now be described with reference to the accompanying drawings in which: Figure 1 is a side view of a brake according to the invention in partial section on line Il-Il of
Figure 2, and
Figure 2 is a view of the brake on line I-I of
Figure 1
The brake has a base plate 3 which is attached by bolts 1 and 2 to a mounting surface 5 of a machine to be provided with the brake. A shaft 20 to be braked passes through the mounting surface 5 and the base plate 3.
As shown in Figure 2, a driver 1 9 carrying a brake disc 10 is mounted on the shaft 20 for rotation therewith and is axially displaceable on the shaft 20.
An E-shaped yoke 4, built up from high-grade magnetic steel laminations, is attached to the base plate 3, for example by wedging. As shown in
Figure 2, the yoke 4 is arranged eccentrically with respect to the shaft 20 inside the contour of the brake disc 10. The yoke 4 and its coil 6 are moulded into a plastics material 21 and are protected in this manner electrically and mechanically. The plastic moulding 21 projects slightly beyond the periphery of the brake disc 10.
An armature 7 which is also built up from highgrade magnetic steel laminations, is associated with the yoke 4. The armature 7 is attached, for example by wedging, to a brake plate 8 on the side of the yoke. The surface of the brake plate facing the brake disc 10 is provided with a friction lining 16.
On the side of the brake disc 10 away from the yoke 4 there is a further brake plate 11 which also has a friction lining 1 5 facing the brake disc 10.
In the same way as the yoke 4, the brake plates 8 and 11 are arranged eccentrically with respect to the shaft 20 and, like the plastic moulding 21, project slightly beyond the periphery of the brake disc 10, as can be seen from Figure 2. In this arrangement the friction linings 1 5 and 1 6 cover a segmental area of the brake disc 10.
The brake plates 8 and 11 are so supported as to be axially displaceable and rotationally rigid on two stud bolts 17 and 18 which are mounted on the base plate 3. The stud bolts 17 and 1 8 are also moulded into the plastic moulding 21 and project axially of the brake disc 1 0 and are outside its periphery.
Two helical comprnssion springs 9 are inserted into borings in the plastic moulding 21 and extend between the base plate 3 and the face of the brake plate 8 opposite the yoke. Thus the springs 9 press the friction lining 1 6 of the brake plate 8 on the side of the yoke against the brake disc 10 and press the brake disc 10 against the friction lining 1 5 of the brake plate 11. In this arrangement the brake plate 11 is held axially by nuts 13 and 14 which are screwed onto the ends of the stud bolts 17 and 18.
In order to release the brake, current is passed through the coil 6. This causes the armature 7 to be attracted against the force of the springs 9, and the brake plate 8 which is connected to the armature 7 is lifted axially away from the brake plate 11 so that the brake disc 10, is released in an axially displaceable manner. The brake plate 11 is prevented from following through by the helical compression springs 12 which are inserted between the brake plates 8 and 11. Naturally, the force of the springs 12 must be less than the force of the springs 9.
With continuing wear of the friction linings 1 5 and 1 6 the air gap between the legs 23 of the yoke 4 and the armature 7 can be readjusted by means of the nuts 13 and 14.
Between the brake plates 8 and 11 nuts 24 and 25 are also screwed onto the stud bolts 1 7 and 1 8. These nuts 24 and 25 are used to limit the axial displacement of the brake plate 8 under the action of the springs 9. This ensures that despite considerable wear of the friction linings 1 5 and 1 6 (without resetting the nuts 1 3 and 14 for wear) the air gap between the yoke 4 and the armature 7 does not become too large and the coil 6 is not destroyed.
In the legs 23 of the yoke 4 short-circuit rings 22 can also be provided. These short-circuit rings 22 prevent periodic oscillations in the armature 7 when the coil 6 carries alternating current.
If the releasing device is to be operated with direct current only, the short-circuit rings 22 can be omitted.
For increasing the braking moment, several brake discs 10 can be arranged adjacent to each other on the shaft 20, in which arrangement there is between adjacent brake discs a brake plate with friction linings on both sides. In this arrangement the first brake plate adjacent the yoke is connected with the armature and is released, the last brake disc remote from the yoke is supported axially on the nuts 1 3 and 14. All the brake discs and the brake plates are axially displaceabie.
Similarly, an embodiment is possible in which the brake plate is axially fixed on the shaft 20 and only the brake plate 8 adjacent the yoke and connected with the armature, is present. In this embodiment the brake pressure acts on the brake disc 10 only in one axial direction.
Finally, an embodiment is also possible in which the brake disc 10 is axially fixed on the shaft 20 and the releasing device with the brake plates 8 and 11 can be moved axially from both sides against the brake disc 10.
Claims (10)
1. An electromagnetically releasable springactuated segmented disc brake comprising a brake disc which is mounted on a shaft to be braked for rotation therewith, brake plates arranged on both sides of the brake disc and provided with friction linings which cover a segmental area of the brake disc, at least one spring which presses the brake plates against the brake disc, and an electromagnetic device for releasing the brake plates against the force of this spring, characterised in that the electromagnetic releasing device includes an E-shaped yoke which is arranged inside the periphery of the brake disc and of the brake plates and adapted to engage one of these brake plates axially, and an armature which is fixed to said one brake plate facing the yoke; and the brake plates and the brake disc are axially displaceable with respect to each other.
2. A disc brake according to Claim 1,
characterised in that the brake plates are held in a rotationally rigid manner by axial stud bolts.
3. A disc brake according to Claim 2, characterised in that the brake disc is arranged to be axially displaceable on the shaft and said one brake plate facing the yoke is arranged for axial displacement on the stud bolts.
4. A disc brake according to Claim 1 or Claim 2, characterised in that the brake disc is axially fixed on the shaft and that only one axially displaceable brake plate is provided facing the yoke.
5. A disc brake according to Claim 1 or Claim 2, characterised in that the brake disc is axially fixed on the shaft and the releasing device is axially displaceable.
6. A disc brake according to Claim 3, characterised in that the brake plate located remote from the yoke is arranged for axial displacement on the stud bolts and, under the action of at least one spring, rests against nuts which are adjustable for wear on the ends of the stud bolts.
7. A disc brake according to Claim 3 or Claim 6, characterised in that wear-linfiting nuts are adjustably mounted on the stud bolts between the brake plates, which nuts limit the axial displacement of the brake plate facing the yoke with respect to the brake disc.
8. A segmented disc brake according to any one of Claims 1,2,3,6 or 7, characterised in that several brake discs are provided axially alternating with brake plates, which are all axially displaceable with respect to each other, and that the armature of the releasing device is fixed to the first brake plate facing the yoke.
9. A disc brake according to any one of the preceding claims, characterised by short-circuiting rings mounted in the legs of the E-shaped yoke.
10. An electromagneticaliy releasable springactuated segmented disc brake constructed and arranged to operate substantially as herein described with reference to the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19782841207 DE2841207A1 (en) | 1978-09-22 | 1978-09-22 | ELECTROMAGNETICALLY RELEASED, SPRING-ACTUATED PARTIAL DISC BRAKE |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB2032548A true GB2032548A (en) | 1980-05-08 |
Family
ID=6050097
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB7932710A Withdrawn GB2032548A (en) | 1978-09-22 | 1979-09-20 | Electromagnetically releasable spring-actuated segmented disc brake |
Country Status (4)
| Country | Link |
|---|---|
| DE (1) | DE2841207A1 (en) |
| FR (1) | FR2436912A1 (en) |
| GB (1) | GB2032548A (en) |
| IT (1) | IT1120015B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000014420A1 (en) * | 1998-09-02 | 2000-03-16 | Continental Isad Electronic Systems Gmbh & Co. Ohg | Braking system for a shaft coupled to a vehicle wheel |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3208248A1 (en) * | 1982-03-08 | 1983-09-15 | Maschinenfabrik Stromag Gmbh, 4750 Unna | SWITCHING ELEMENT, PARTICULARLY SPRING BRAKE OR CLUTCH |
| FR2588702A1 (en) * | 1985-10-14 | 1987-04-17 | Lenabour Marcel | Device facilitating the disengaging of the interlock toothing of an electromagnetic braking system mounted on a motor |
| DE19849749A1 (en) * | 1998-10-28 | 2000-05-04 | Mayr Christian Gmbh & Co Kg | Part-pad spring pressure brake to engage a rotating disc |
| DE20303060U1 (en) * | 2003-02-25 | 2004-07-08 | Bubenzer Bremsen Gerhard Bubenzer Ing. Gmbh | Motor mounting brake |
| DE102012019136B4 (en) * | 2012-09-28 | 2017-04-13 | Sew-Eurodrive Gmbh & Co Kg | Brake assembly and electric motor with a brake assembly |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB578464A (en) * | 1944-06-02 | 1946-06-28 | Standard Telephones Cables Ltd | Improvements in or relating to laminated cores for transformers and other electrical apparatus |
| GB612999A (en) * | 1945-09-04 | 1948-11-19 | Gen Tire & Rubber Co | Resilient mounting for armature blocks |
| GB916726A (en) * | 1960-04-23 | 1963-01-30 | Wilhelm Binder | Electromagnetically released multi-disc brake |
| GB1044457A (en) * | 1964-05-05 | 1966-09-28 | Westinghouse Electric Corp | Open delta magnet |
| CH443466A (en) * | 1965-05-21 | 1967-09-15 | Verlinde Sa | Disc brake, electromagnetic, for electric motor |
| FR2030998A5 (en) * | 1969-04-21 | 1970-11-13 | Leze Kg Maschf Hans |
-
1978
- 1978-09-22 DE DE19782841207 patent/DE2841207A1/en not_active Ceased
-
1979
- 1979-09-20 GB GB7932710A patent/GB2032548A/en not_active Withdrawn
- 1979-09-21 IT IT50329/79A patent/IT1120015B/en active
- 1979-09-24 FR FR7923727A patent/FR2436912A1/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000014420A1 (en) * | 1998-09-02 | 2000-03-16 | Continental Isad Electronic Systems Gmbh & Co. Ohg | Braking system for a shaft coupled to a vehicle wheel |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2436912A1 (en) | 1980-04-18 |
| IT1120015B (en) | 1986-03-19 |
| DE2841207A1 (en) | 1980-04-03 |
| IT7950329A0 (en) | 1979-09-21 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |