GB2139173A - A brake in a gearbox for a conveyer belt drive - Google Patents

A brake in a gearbox for a conveyer belt drive Download PDF

Info

Publication number
GB2139173A
GB2139173A GB08402407A GB8402407A GB2139173A GB 2139173 A GB2139173 A GB 2139173A GB 08402407 A GB08402407 A GB 08402407A GB 8402407 A GB8402407 A GB 8402407A GB 2139173 A GB2139173 A GB 2139173A
Authority
GB
United Kingdom
Prior art keywords
gearbox
brake
casing
shaft
sensing device
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
GB08402407A
Other versions
GB2139173B (en
GB8402407D0 (en
Inventor
Roy Sykes Mellor
James Eugene Lockwood
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Pitcraft Summit Ltd
Original Assignee
Pitcraft Summit Ltd
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 claimed from GB838302402A external-priority patent/GB8302402D0/en
Application filed by Pitcraft Summit Ltd filed Critical Pitcraft Summit Ltd
Priority to GB08402407A priority Critical patent/GB2139173B/en
Publication of GB8402407D0 publication Critical patent/GB8402407D0/en
Publication of GB2139173A publication Critical patent/GB2139173A/en
Application granted granted Critical
Publication of GB2139173B publication Critical patent/GB2139173B/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G23/00—Driving gear for endless conveyors; Belt- or chain-tensioning arrangements
    • B65G23/24—Gearing between driving motor and belt- or chain-engaging elements
    • B65G23/26—Applications of clutches or 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
    • 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
    • F16D55/36—Brakes with a plurality of rotating discs all lying side by side
    • F16D55/38—Brakes with a plurality of rotating discs all lying side by side mechanically actuated
    • 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
    • F16D55/36—Brakes with a plurality of rotating discs all lying side by side
    • F16D55/40—Brakes with a plurality of rotating discs all lying side by side actuated by a fluid-pressure device arranged in or one the brake
    • 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
    • F16D2055/0058—Fully lined, i.e. braking surface extending over the entire disc circumference

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Braking Arrangements (AREA)

Abstract

A gearbox, suitable for driving a belt conveyor, comprises a casing (3), an input shaft rotatably mounted in the casing (3) and adapted to be connected to a prime mover, an output shaft also rotatably mounted in the casing (3) and adapted to be connected to a component to be driven, gearing interconnecting the input and output shafts, and a torque-responsive, multi-disc brake (28) co-axially arranged around a rotary shaft (10) of the gearbox, the brake (28) being spring urged into a braking condition and hydraulically urged into a release condition, and furthermore being located within a totally enclosing casing (32). <IMAGE>

Description

SPECIFICATION Gearbox This invention relates to a gearbox particularly, though not exclusively, for driving a belt conveyor.
Conventional belt conveyor drives comprise a prime mover, usually in the form of an electric motor, which drives a speed reduction gearbox, through a fluid coupling, the gearbox driving a roller around the periphery of which the conveyor belt is looped in frictional driving relationship. In order to prevent momentary njn-back of the conveyor belt when the latter is put into a drive condition upon start-up of the electric motor, known constructions have incorporated band brakes on some external part of the drive, and although such brakes have in general satisfied their functional requirements, they are inevitably subject to a heat build-up and consequently present a fire hazard, which is particularly disadvantageous if the conveyor is located in the roadway or drift of a coal mine.Also, such brakes have been torque-responsive to preclude brake release until adequate driving torque is available to prevent run-back of the conveyor belt.
According to the present invention, there is provided a gearbox, suitable for driving a belt conveyor, comprising a casing, an input shaft rotatably mounted in the casing and adapted to be connected to a prime mover, an output shaft also rotatably mounted in the casing and adapted to be connected to a component to be driven, gearing interconnecting the input and output shafts, and a torqueresponsive, multi-disc brake coaxially arranged around a rotary shaft of the gearbox, the brake being spring urged into a braking condition and hydraulically urged into a release condition, and furthermore being located within a totally enclosing casing.
Thus, the gearbox in accordance with the invention is provided with a highly efficient multi-disc brake which, by being located in a fully enclosing casing, is isolated from the surrounding atmosphere and consequently considerably reduces, if not eliminates the fire hazard.
Conveniently, pressure fluid to provide brake release is available from a pump. The latter is preferably drivable by a small electric motor, e.g. of 3 h.p., and conveniently start up of the small electric motor is effected simultaneously with the prime mover e.g. a main electric motor, with a control valve interposed between the pump and the brake to control admission or non-admission of pressure fluid to the brake, with pump start-up commenced when a sensing device senses movement of the gearbox shaft with which the brake is associated.
The sensing device may be electrically, mechanically, or hydraulically operated. For example, it may incorporate a hydraulic valve or micro-switch activated when an outer component of the brake commences rotation, e.g. by a projecting finger carried by the brake outer. The brake spring may be a coil compression spring, or a pack of disc springs.
In detail, the input shaft may terminate at its inner end in a first bevel gear of a bevel gear set, the second bevel gear of that set being carried on a transverse shaft, one portion of which carries a spur gear in mesh with a further spur gear on a further, parallel shaft, for continued transmission of power from the prime mover, and another portion being associated with the brake. Preferably, that other portion projects from the gearbox casing, with the projecting portion, and brake, shrouded by a brake casing which is preferably removable, and may be a one piece or multi-piece component. Hence only this brake casing need be removed in order to expose the brake for service and/or repair.In addition, is it possible to provide the input shaft with an anti-run back device, e.g. in the form of a sprag clutch for enhanced safety as such may be required if the gearbox is driving a belt conveyor disposed in a particularly steep location.
The invention will now be described in greater detail, by way of example with reference to the accompanying drawings in which; Figure lisa sectional view through a gearbox in accordance with the invention; Figure 2 is a sectional view, to an enlarged scale, of the brake of Figure 1; and Figure 3 is a section on the Ill-Ill of Figure 2.
In the drawings, a gearbox 1 for driving a belt conveyor, indicated partially at 2, comprises a casing 3 carrying bearings 4 for supporting an input shaft 5 rotatable about an axis 6 and adapted to be connected to a prime mover in the form of an electric motor (not shown), the input shaft 5 terminating at its inner end 7 in a first bevel gear 8 of a bevel gear set, the second bevel gear 9 of that set being carried on a transverse shaft 10 rotatable about a transverse axis 11 and mounted in bearings 12 carried by the casing 3. One portion 13 of the transverse shaft 10 carries a spur gear 14 in mesh with a further spur gear 15 on a parallel output shaft 16 rotatable about an axis 17 and mounted in bearings 18 carried by the casing 3.An output pinion 19 is carried at a teminal end of the output shaft 16 and in mesh with a driven wheel 20 co-axially carried on a drive shaft 21 rotatable about an axis 22 and mounted in bearings 23 (one only visible), the axis 22 being co-incidend with an axis 24 of a belt drive roller 25 around the periphery of which is wrapped belt 26 in frictional driving relationship.
Another portion 27 of the transverse shaft 10 co-axially carries a torque responsive multi-disc brake 28. As best seen in Figures 2 and 3, the brake 28.comprises first disc elements 29 attached to the input shaft 10 and hence rotatable therewith, which elements 29 are interleaved with the second disc elements 30 carried by an annular brake outer 31, which outer is capable of rotation with respect to a casing 32 which shrouds the brake 28, the casing 32 being of multi-part construction and secured by bolts 33 to casing 3 of the gearbox 1. The disc elements 29 and 30 are urged into a braking condition by a pack 34 of disc springs operable on a collar 35, bearing at one side on a projecting annular collar 36 in engagement with the adjacent disc element.The collar 35 is carried on a shaft 37, co-axial with the axis 11, which shaft 37 also carries a piston head 38 located in a cylinder 39 secured by bolts 40 to the casing 32. The piston head 38 has an annulus area 41 connected by a bore 42 extending to a hydraulic pump 43 with a control valve 44 in a fluid supply 45 line from the pump to the bore 42. The brake outer 31 carries a projecting finger 46, while the casing 32 is provided with a circumferential, and segmentally extending slot 47, so that the finger 46, and hence the brake outer 31 is capable of rotation over the segmental angle selected, until the finger 46 is obstructed from further rotational movement by abutting either end of the slot 47, between positions 46 and 46A.In the last mentioned position, the finger is adapted to strike a micro-switch (not shown) adapted to actuate the control valve 44 in the supply line 45 from the pump to the bore 42.
In detail, it is preferred for the pump 43 to be drivable buy a relatively small electric motor e.g. of 3 h.p., with this motor being switched on and switched off with the main motor and hence with the pump output either being dumped to tank, under the control of the associated valve 44, when brake release is not required, or alternatively being admitted to the bore 42 and hence the annulus area 41, again under control of the associated valve 44, when brake release is required. As indicated in Figure 3, with driving torque being clockwise, as indicated by arrow 48, and with back torque from the belt 26 being anti-clockwise, as indicated by arrow 49, the finger is in position 46, until clockwise rotation of the brake outer 31, displaces the finger to position 46A, thereby indicating that sufficient torque is then available to drive the belt 26 without runback, the finger, upon attaining position 46A actuating the micro-switch, to open the valve 44, to cause admission of pressure fluid to the annulus area 41, to cause displacement of the piston head 38, its shaft 37 and the collar 35, against the action of the spring 34, to release the brake 28 and thereby to permit driving torque to be transmitted to the roller 25, and hence the belt 26.
The input shaft 5 is also provided with a sprag clutch 50 serving as an anti-run back device.

Claims (23)

1. A gearbox, suitable for driving a belt conveyor, comprising a casing, an input shaft rotatably mounted in the casing and adapted to be connected to a prime mover, an output shaft also rotatably mounted in the casing and adapted to be connected to a component to be driven, gearing interconnecting the input and output shafts, and a torqueresponsive, multi-disc brake co-axially arranged around a rotary shaft of the gearbox, the brake being spring urged into a braking condition and hydraulically urged into a release condition, and furthermore being located within a totally enclosing casing.
2. A gearbox as claimed in Claim 1, wherein pressure fluid to provide brake release is available from a pump.
3. A gearbox as claimed in Claim 2, wherein the pump is drivable byan individual electric motor.
4. A gearbox as claimed in Claim 3, wherein startup of the individual electric motor is effected simultaneously with the prime mover.
5. A gearbox as claimed in any one of Claims 2 to 4, wherein a control valve is interposed between the pump and the brake to control admission, or nonadmission, of pressure fluid to the brake.
6. A gearbox as claimed in any one of Claims 2 to 5, wherein the pump start-up is commenced when a sensing device senses movement of the gearbox shaft with which the brake is associated.
7. A gearbox as claimed in Claim 6, wherein the sensing device is electrically operated.
8. A gearbox as claimed in Claim 6, wherein the sensing device is mechanically operated.
9. A gearbox as claimed in Claim 6,whereinthe sensing device is hydraulically operated.
10. A gearbox as claimed in Claim 7, wherein the sensing device incorporates a micro-switch activated when the brake outer commences rotation.
11. A gearbox as claimed in Claim 9, wherein the sensing device incorporates a hydraulic valve or micro-switch activated when the brake outer commences rotation.
12. A gearbox as claimed in Claim 10 or 11, wherein the brake outer carries a projecting finger adapted to contact the hydraulic valve or microswitch.
13. A gearbox as claimed in any preceding Claim, wherein the brake spring is a coil compression spring.
14. A gearbox as claimed in any one of Claims 1 to 12, wherein the brake spring is a pack of disc springs.
15. A gearbox as claimed in any preceding Claim, wherein the input shaft terminates at its inner end in a first bevel gear of a bevel gear set, the second bevel gear of that set being carried on a transverse shaft, one portion of which carries a spur gear in mesh with a further gear on a further, parallel shaft, for continued transmission of power from the prime mover, and another portion being associated with the brake.
16. A gearbox as claimed in Claim 15, wherein that other portion projects from the gearbox casing, with the projecting portion, and brake, shrouded by a brake casing.
17. A gearbox as claimed in Claim 16, wherein the brake casing is removable.
18. A gearbox as claimed in Claim 16 or 17, wherein the brake casing is a one piece component.
19. A gearbox as claimed in Claim 16 or 17, wherein the brake casing is a multi-piece component.
20. A gearbox as claimed in any preceding Claim, wherein the imput shaft is provided with an anti-run-back device.
21. A gearbox as claimed in Claim 20, wherein the anti-run-back device is a sprag clutch.
22. A gearbox, suitable for driving a belt conveyor, substantially as hereinbefore described with reference to the accompanying drawings.
23. A belt conveyor provided with a gearbox as claimed in any preceding Claim.
GB08402407A 1983-01-28 1984-01-30 A brake in a gearbox for a conveyor belt drive Expired GB2139173B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB08402407A GB2139173B (en) 1983-01-28 1984-01-30 A brake in a gearbox for a conveyor belt drive

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB838302402A GB8302402D0 (en) 1983-01-28 1983-01-28 Gearbox
GB08402407A GB2139173B (en) 1983-01-28 1984-01-30 A brake in a gearbox for a conveyor belt drive

Publications (3)

Publication Number Publication Date
GB8402407D0 GB8402407D0 (en) 1984-02-29
GB2139173A true GB2139173A (en) 1984-11-07
GB2139173B GB2139173B (en) 1986-04-16

Family

ID=26285058

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08402407A Expired GB2139173B (en) 1983-01-28 1984-01-30 A brake in a gearbox for a conveyor belt drive

Country Status (1)

Country Link
GB (1) GB2139173B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2605372A1 (en) * 1986-10-15 1988-04-22 Rexroth Mannesmann Gmbh Hydraulically operated multiple disc brake
DE4041431A1 (en) * 1989-12-22 1991-07-04 Myotoku Kk Brake with input rotary shaft - has cam arrangement with cam disc, piston in cylinder, and oil inlet and outlet
WO2005090816A1 (en) * 2004-03-17 2005-09-29 Robert Bosch Gmbh Spring-actuated parking brake device

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB446419A (en) * 1934-10-24 1936-04-24 Mavor & Coulson Ltd Improvements in or connected with compressed air turbine driven belt conveyors

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB446419A (en) * 1934-10-24 1936-04-24 Mavor & Coulson Ltd Improvements in or connected with compressed air turbine driven belt conveyors

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2605372A1 (en) * 1986-10-15 1988-04-22 Rexroth Mannesmann Gmbh Hydraulically operated multiple disc brake
DE4041431A1 (en) * 1989-12-22 1991-07-04 Myotoku Kk Brake with input rotary shaft - has cam arrangement with cam disc, piston in cylinder, and oil inlet and outlet
WO2005090816A1 (en) * 2004-03-17 2005-09-29 Robert Bosch Gmbh Spring-actuated parking brake device
JP2007502740A (en) * 2004-03-17 2007-02-15 ローベルト　ボツシユ　ゲゼルシヤフト　ミツト　ベシユレンクテル　ハフツング Spring-operated parking brake device

Also Published As

Publication number Publication date
GB2139173B (en) 1986-04-16
GB8402407D0 (en) 1984-02-29

Similar Documents

Publication Publication Date Title
KR20010050191A (en) Automatic transmission with dual gain multi-disk friction device
US4346622A (en) Four speed transaxle with mid-position transfer drive
US4125178A (en) Drive mechanism
CA2225887C (en) Power take-off unit with selectively engaged brake
AU697085B2 (en) Positive displacement coupling device
US3490567A (en) Engine with hydrodynamic retarder
US3626692A (en) Gas turbine power plant
GB2139173A (en) A brake in a gearbox for a conveyer belt drive
US5415257A (en) Clutch structure
US4506772A (en) Modular accesories for clutch/brake unit
US5333712A (en) Synchronized clutch
US4160391A (en) Auxiliary drive mechanism
CA1316371C (en) Differential gearing
US4456109A (en) Transmission coupling including a clutch-brake combination
RU1811557C (en) Device for drive of chain ploughing unit
JP2005140331A (en) Trowel gearbox brake
GB1303011A (en)
US4460075A (en) Reversing drive unit
US4805473A (en) Bi-directional torque transmission unit
GB2074258A (en) Change-speed gearbox
RU99113039A (en) VEHICLE-DRIVED WINCH WITH VEHICLE
US2634627A (en) Automatic power transmission mechanism
EP0410598A1 (en) Brake actuator
GB1594972A (en) Planetary gear including a brake device
GB2047408A (en) Sensing overload in a geared drive

Legal Events

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

Effective date: 19930130