JP2011102182A - Mechanical brake device for hoisting machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem in a conventional mechanical brake device wherein oil in an oil-retaining bush or oil applied to a bush leaks out depending on the working situation or working environment of a hoisting machine and infiltrates between contact surfaces of a brake disk and a ratchet wheel to lower the frictional resistance of the brake disc. <P>SOLUTION: A mechanical brake for the hoisting machine is adapted to support the inner periphery of a ratchet wheel 6 by an oil-retaining bush 8 in a boss 4a between a driving member 2 and a brake carrier 4 of the hoisting machine and to interpose brake discs 7 between both side faces of the ratchet wheel 6 and oil-retaining bush 8 and side faces of the driving member 2 and brake carrier 4. The ratchet wheel 6 and the brake discs 7 are separably connected out of relative rotation. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a mechanical brake device in a hoisting machine such as a lever hoist, and more particularly to a mechanical brake device that prevents a reduction in frictional resistance of a brake plate due to intrusion of oil from an oil-impregnated bush bearing a pinion wheel.

In a mechanical brake device in a conventional hoisting machine, a claw wheel is fitted to a boss between a brake receiver and a drive member, and a brake plate is interposed between both side surfaces of the claw wheel and a side surface of the brake receiver and the drive member. A cylindrical bearing bush made of a self-lubricating material is detachably provided between the boss and the center hole of the claw wheel, and the lubricity between the boss part and the center hole of the claw wheel is improved. Mechanical brake devices that prevent the occurrence of galling and abnormal noise due to friction are well known. (See Patent Document 1)
The bush made of the self-lubricating material described in the above-described patent document is impregnated to reduce the frictional resistance at the sliding portion, and may be further coated with oil or grease.
Japanese Utility Model Publication No. 62-41031

  In the above-described conventional mechanical brake device, the oil content of the oil-impregnated bush or the oil applied to the bush leaks depending on the use condition or use environment of the hoisting machine, and enters between the contact surface of the brake plate and the claw wheel. It had the subject that the frictional resistance of this falls. When the frictional resistance of the brake plate decreases, for example, when the lever hoist is used, when the operator releases his / her hand during the load lowering operation, the lever's own weight lowers to a position where the lever tip faces vertically downward, Small brake slip occurs.

  The present invention has a boss between a drive member of a hoisting machine and a brake receiver to support the inner periphery of the claw wheel with an oil-impregnated bush, and both sides of the hook wheel, the oil-impregnated bush, the drive member, and a side surface of the brake receiver. And a brake plate, wherein the claw wheel and the brake plate are connected to each other so as not to be relatively rotatable and to be separable.

  The brake plate is provided with a projection, the claw wheel is provided with a fitting hole into which the projection is fitted, and the projection of the brake plate is fitted into the fitting hole of the claw wheel.

  Further, the brake plate and the ratchet wheel are connected by a connecting pin.

  Further, a projection is provided on the ratchet wheel, a fitting hole for fitting the projection on the brake plate is provided, and the projection of the ratchet wheel is fitted in the fitting hole of the brake plate.

  In addition, a disc in which a protrusion is integrally formed is bonded to the brake plate, and the protrusion of the brake plate is fitted into a fitting hole of a claw wheel.

  Furthermore, a concave groove is provided on the ratchet wheel, a convex portion that fits into the concave groove is provided on the brake plate, and a convex portion of the brake plate is fitted on the concave groove of the ratchet wheel. Features.

  The present invention has a boss between a drive member of a hoisting machine and a brake receiver to support the inner periphery of the claw wheel with an oil-impregnated bush, and both sides of the hook wheel, the oil-impregnated bush, the drive member, and a side surface of the brake receiver. The brake plate is interposed between the claw wheel and the brake plate so that the claw wheel and the brake plate cannot be rotated relative to each other and can be separated from each other, and the contact surface between the claw wheel and the brake plate is fixed. Therefore, even if oil leaks from the oil-impregnated bush, the contact surface between the brake plate and the ratchet wheel is fixed. Can be prevented. Also, if the brake plate and the ratchet wheel are bonded and fixed with an adhesive to fix the claw wheel and the brake plate, the inner diameter of the brake plate needs to be larger than the outer diameter of the oil-impregnated bush. The brake plate is relatively small and has a problem that the brake plate wears, generates heat, and strength decreases when braking by high surface pressure. However, in the present invention, it is not necessary to make the brake plate small, so even at high surface pressure. The brake plate does not wear, generate heat, or lose strength. Further, in the brake device in which the conventional brake plate and the braking surface of the ratchet wheel are in pressure contact with each other, the braking surface of the ratchet wheel needs to be set to an external height in order to secure the brake torque. Therefore, there is no need to process the braking surface of the claw wheel to an external height. In addition, the protrusions of the brake plate and ratchet wheel are integrally molded, and the fitting holes provided in the brake plate and ratchet wheel can be drilled so that they can be manufactured at low cost and the oil-impregnated bush is lubricated. Even if lubrication is performed to improve the performance, extra oil is adsorbed and occluded on the contact surface between the brake plate and the ratchet wheel, so there is no effect on brake braking, so it is possible to provide a mechanical brake for a hoisting machine with high lubrication performance it can.

The front view of the lever hoist provided with the mechanical brake of this invention. Sectional drawing of 1st Embodiment of the mechanical brake of this invention. Sectional drawing of 2nd Embodiment of the mechanical brake of this invention. Sectional drawing of 3rd Embodiment of the mechanical brake of this invention. Sectional drawing of 4th Embodiment of the mechanical brake of this invention. Sectional drawing of 5th Embodiment of the mechanical brake of this invention. The side view of the form which fixed the claw wheel and the brake plate with the volt | bolt. The side view of the form which carried out the fitting fixing of the claw wheel and the brake plate.

  An embodiment of the present invention will be described with reference to FIGS.

  FIG. 1 is a front view of a lever whist provided with a mechanical brake 1 of the present invention. In FIG. 1, reference numeral 2 denotes a drive member that rotates in conjunction with the operation lever 3, and is screwed into a multi-thread screw 5 a provided on the drive shaft 5.

  4 is a brake receiver that is non-rotatably fitted to a spline 5b provided on the drive shaft 5. Between the brake receiver 4 and the drive member 2, a brake plate 7 provided on both sides of the claw wheel 6 and the claw wheel 6, Oil-impregnated bushes 8 fitted to the boss portions 4a of the brake receiver 4 are interposed in spaces formed between the center hole 6b of the ratchet wheel 6 and the brake plates 7 and 7, respectively. Reference numeral 20 denotes a claw piece which engages with teeth provided on the outer periphery of the claw wheel 6 and allows the claw wheel 6 to be rotated only in the winding direction.

  The mechanical brake 1 is composed of the drive member 2, brake receiver 4, drive shaft 5, claw wheel 6, brake plates 7 and 7, oil-impregnated bush 8, and claw piece 20.

  Reference numeral 9 is a load sheave, 10 is a load gear integrally formed with the load sheave 9, 11 is a pinion provided at the end of the drive shaft 5, 12 is a reduction gear meshing with the pinion 11, and 13 is coaxial with the reduction gear 12 A reduction gear 14 that is engaged and meshed with the load gear 10 is wound around the load sheave 9, and a load chain having a lower hook (not shown) that engages the load at the lower portion, 15 is an upper hook, and 16 is an idle gear. It's rolling.

  The operation of the lever hoist described above will be described. The operation lever 3 is rotated to rotate the drive shaft 5 via the drive member 2, and the load sheave 9 is rotated via the pinion 11, the reduction gears 12 and 13 and the load gear 10 provided at one end of the drive shaft 5. The load chain 14 wound around the load sheave 9 is wound, and the load is lifted or pulled by a lower hook provided at one end of the chain 14.

  Next, a detailed configuration of the mechanical brake according to the first embodiment of the present invention will be described with reference to FIG.

  In FIG. 2, a claw wheel 6, brake plates 7 and 7, and an oil-impregnated bush 8 are provided between the drive member 2 of the mechanical brake and the brake receiver 4. The drive member 2 is screwed into a multi-thread screw 5a provided on the drive shaft 5, and the brake receiver 4 is fitted with a spline 5b provided on the drive shaft 5, and bulges from the brake receiver 4 toward the drive member 2 side. The boss portion 4 a is fitted with a claw wheel 6 and an oil-impregnated bush for bearing the inner periphery of the claw wheel 6, and a pair of brake plates 7, 7 are disposed on both sides of the claw wheel 6 and the oil-impregnated bush 8. It is provided so that it can rotate integrally. The brake plates 7 and 7 are provided with a plurality of integrally formed projections 7a and 7a, and fitting holes 6a into which the projections 7a and 7a are fitted are provided on both sides of the ratchet wheel 6 in the circumferential direction. Yes. The projections 7a and 7a of the brake plates 7 and 7 are fitted into the fitting holes 6a of the ratchet wheel 6, and the brake plates 7 and 7 and the ratchet wheel 6 are connected so as to be non-rotatable and separable.

  Reference numeral 6 b denotes a center hole of the claw wheel 6 that fits in the oil-impregnated bush 8. An oil-impregnated bush 8 is fitted to the boss 4 a of the brake receiver 4 in a space defined by the brake plates 7 and 7 and the center hole 6 b of the claw wheel 6.

  In this embodiment, in a state where the oil impregnation bush 8 is sandwiched between the claw wheel 6 and the two brake plates 7, 7, the protrusions 7 a, 7 a of the brake plates 7, 7 and the fitting hole 6 a of the claw wheel 6. The brake plates 7 and 7 and the claw wheel 6 can be easily fixed by fitting them together, and the brake plates 7 and 7, the claw wheel 6 and the oil impregnation bush 8 can be integrated.

  As described above, in the conventional mechanical brake in which the brake plate is bonded to the ratchet wheel with an adhesive or the like, the inner diameter of the brake plate needs to be larger than the outer diameter of the oil-impregnated bush. Therefore, at high surface pressure, there is a problem that the brake plate wears, generates heat, and strength decreases, and because the oil-impregnated bush becomes relatively large, the oil content increases, and the oil impregnation Since the brakes of the bush and the brake plate are close to each other, the oil in the oil-impregnated bush leaks to the braking surface of the brake plate, and the friction resistance of the brake plate is reduced. In the state where the oil-impregnated bush 8 is fitted in the space formed by the two brake plates 7 and 7, the brake plates 7 and 7 Is not required to be as small as in the conventional device, and even if oil leaks out from the oil-impregnated bush 8, the oil is adhered and occluded on the side of the brake plates 7 and 7 fixed to the claw wheel 6 Since the brake plates 7 and 7 do not leak to the surface where the drive member 2 and the brake receiver 4 contact, the frictional resistance of the brake plates 7 and 7 does not decrease. Therefore, it is possible to prevent the occurrence of minute brake slip in the conventional mechanical brake.

  Next, another embodiment of the present invention will be described.

  FIG. 3 shows a mechanical brake according to the second embodiment. The hook 6 is provided with a fitting hole 6c, the brake plates 7 and 7 are provided with fitting holes 7b and 7b, and the brake plates 7 and 7 are provided with fitting holes 7b, The connecting pin 18 is inserted into the fitting hole 6c of the claw wheel 7b and the claw wheel 6, the brake plates 7 and 7 and the claw wheel 6 are connected by the connecting pin 18, and the claw wheel 6 and the brake plates 7 and 7 are detachably connected. It is a mechanical brake of the form. Other configurations and operations are the same as those of the first embodiment.

  FIG. 4 shows a third embodiment in which the ratchet wheel 6 is provided with projections 6d and 6d, and the projections 6d and 6d are fitted into fitting holes 7b and 7b provided in the brake plates 7 and 7, respectively. And brake plates 7 and 7 are separably connected to each other.

  FIG. 5 shows a fourth embodiment in which a metal disc 19 formed with a projection 19 a is bonded to the brake plate 7 with an adhesive, and the projection 19 a of the metal disc 19 is provided on the claw wheel 6. The mechanical brake is configured to fit in the hole 6a and connect the claw wheel 6 and the brake plates 7 and 7 in a separable manner.

  FIG. 6 shows a fifth embodiment in which the claw wheel 6 is provided with a plurality of grooves 6e, and the brake plate 7 is provided with a protrusion 7c into which the groove 6e is fitted. In this mechanical brake, the concave groove 6e is fitted to the convex portion 7c of the brake plate 7, and the ratchet wheel 6 and the brake plates 7, 7 are detachably connected.

  FIG. 7 shows a side view of the second embodiment. If the connecting pin 18 in the side view of FIG. 7 is replaced with the fitting hole and the fitting protrusion of the first, third, and fifth embodiments, the respective side views will be omitted.

  FIG. 8 shows a side view of the fourth embodiment.

DESCRIPTION OF SYMBOLS 1 Mechanical brake 2 Drive member 4 Brake receiver 4a Boss part 6 Claw wheel 6a, 6c Fitting hole 6b Center hole 6d Protrusion 6e Groove groove 7 Brake plate 7a Protrusion 7b Fitting hole 7c Convex part 8 Oil containing bush 18 Connection pin 19 Metal disc 20 Claw piece

Claims (6)

  The boss between the drive member of the hoisting machine and the brake receiver supports the inner periphery of the ratchet wheel with an oil-impregnated bush, and between the both sides of the hook wheel and the oil-impregnated bush and the side surfaces of the drive member and the brake receiver. A mechanical brake device in a hoisting machine, wherein a mechanical brake includes a brake plate, and the claw wheel and the brake plate are connected to each other so as not to be relatively rotatable and separable.   The winding according to claim 1, wherein a projection is provided on the brake plate, a fitting hole for fitting the projection on the claw wheel is provided, and a projection on the brake plate is fitted in the fitting hole of the claw wheel. Mechanical brake device in the upper machine.   The mechanical brake device in a hoisting machine according to claim 1, wherein the brake plate and the ratchet wheel are connected by a connecting pin.   The winding according to claim 1, wherein a projection is provided on the ratchet wheel, a fitting hole for fitting the projection on the brake plate is provided, and a projection of the ratchet wheel is fitted in the fitting hole of the brake plate. Mechanical brake device in the upper machine.   The mechanical brake device for a hoisting machine according to claim 2, wherein a disc having a protrusion integrally formed thereon is bonded to the brake plate, and the protrusion of the brake plate is fitted into a fitting hole of a claw wheel.   The claw wheel is provided with a concave groove, the brake plate is provided with a convex part that fits into the concave groove, and the convex part of the brake plate is fitted into the concave groove of the claw wheel. The mechanical brake device in the hoist according to claim 1.

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