JPH06206695A - Electric type hoisting-towing device - Google Patents

Abstract

PURPOSE:To reduce the reception of thermal influence of a motor by solving a problem when an overload preventive device is arranged on the load side of a brake, also solving a problem when a shaft directional length becomes long while using effectively space between side plates, and facilitating the centering of a motor shaft and a driving shaft. CONSTITUTION:A motor shaft 4 and a driving shaft 52 are arranged opposite each other between side plates 11 and 12, and an overload preventive device 6 having a receiving member 61, a presser member 62, friction members 63 and 67, an elastic body 64 and an overload setting-adjusting member 65 is arranged between these shafts. Thereby, a problem when the overload preventive device 6 is arranged on the load side of a brake can be solved, and a problem when a shaft directional length becomes long can be also solved, so that the reception of thermal influence of a motor can be reduced, besides the centering of the motor shaft can be facilitated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric hoisting and pulling device, and more specifically, a motor, a motor shaft driven by the motor, a drive arranged on the same shaft as the motor shaft, and interlocking with the motor shaft. The present invention relates to an electric hoisting and traction device including a shaft and a load sheave that is driven in association with the drive shaft.

[0002]

2. Description of the Related Art Generally, a hoisting and traction device slips when a load sheave is overloaded and prevents further hoisting and towing in order to prevent hoisting and towing in an overloaded state. An overload protection device is provided.

As the overload preventing device, an intermediate shaft portion of a reduction gear mechanism provided between a motor shaft and a load sheave, that is, a second reduction gear, for example, as disclosed in JP-A-51-106950. What is provided between the reduction gear and an intermediate shaft that supports the reduction gear, for example, Japanese Patent Publication No. 63-38
As disclosed in Japanese Patent No. 31, the one provided between the motor shaft and the drive shaft arranged on the same shaft as the motor shaft, that is, the first gear shaft of the reduction gear mechanism is known.

[0004]

However, when an overload preventing device is provided on the intermediate shaft, the axial length of the intermediate shaft becomes long, and the gear case becomes large accordingly, resulting in a large size as a whole. At the same time, generally, the motor shaft is usually provided with an electromagnetic brake and, in some cases, a mechanical brake so that the hoisting position is maintained when the motor is stopped. , The overload prevention device is the load side of this brake,
That is, since it is provided on the load sheave side, the slip load set by the overload prevention device, in other words, the so-called inching operation in which the hoisting and lowering operations are repeated near the setting position of the transmission torque is violently performed. When the friction plate of the overload prevention device is heated and, as a result, the characteristics of the friction plate change, this is an extremely rare case, but even if no external force acts, the overload prevention device slips and the load Is lowered, and there is a problem that it cannot be held in a fixed position.

Further, when the overload preventing device is provided between the motor shaft and the first gear shaft as in Japanese Patent Publication No. 63-3831, the following problems occur.

That is, in the hoisting and traction device described in the above publication, the first gear shaft is projected toward the motor chamber side from the motor side plate, and the shaft end portion of the projecting shaft portion has one end of the motor shaft. After the parts are fitted so that they can rotate relative to each other, they are connected and supported,
Since the overload prevention device is provided at the connecting portion of each shaft end, the latter problem of the above-mentioned conventional example is solved, but the total shaft length of the first gear shaft and the motor shaft is solved. Is longer than in the case where the overload prevention device is not provided, and the problem that the motor case becomes large and the overall size is large remains, and moreover, one end of the motor shaft is attached to the motor. Since it is located indoors and is fitted and supported on the shaft end of the first gear shaft, it is difficult to center the first gear shaft and the motor shaft, and
Since one end of the motor shaft is supported by the shaft end of the first gear shaft so as to be relatively rotatable, runout occurs,
It has other problems such as wear and abnormal noise.

An object of the present invention is to solve the conventional problem of providing the overload prevention device on the anti-motor side of the brake, that is, on the load side while providing the overload prevention device.
The space between the side plates can be effectively used to solve the problem that the axial length becomes long, and yet the motor shaft and drive shaft can be easily centered, and the problem of the motor shaft swinging as in the conventional example can be solved. It is possible to solve the problem and to reduce the influence of the heat of the motor.

[0008]

In order to achieve the above object, the present invention provides a motor 3, a motor shaft 4 driven by the motor 3, and a motor shaft 4 arranged on the same axis as the motor shaft 4. In an electric hoisting and traction device including a drive shaft 52 that interlocks with the motor shaft 4 and a load sheave 2 that interlocks with the drive shaft 52, the motor shaft 4 and the drive shaft 5
2 is placed between the side plates 11 and 12 to face each other,
Between the motor shaft 4 and the drive shaft 52, a receiving member 6 is coupled to one of the motor shaft 4 and the drive shaft 52 so as not to rotate relative to each other.
A pressing member 62 that is connected to one and the other so as not to rotate relative to each other, a friction member 63 that is interposed between the receiving member 61 and the pressing member 62, and an elastic body 64 that presses the pressing member 62 toward the receiving member 61 side. The overload prevention device 6 including the overload setting adjusting member 65 that adjusts the pressing force of the elastic body 64 is provided.

A coupling portion 61, such as a spline, which is coupled to one of the motor shaft 4 and the drive shaft 52 so as to be relatively non-rotatable.
It has a receiving member 61 having a, a holding member 62 having a connecting portion 62a such as a spline for non-rotatably connecting to the other, a receiving portion 66a facing the receiving member 61 at one end, and the receiving portion at an intermediate portion. A case member 66 having an inner cavity portion 66b capable of holding the member 61 and the pressing member 62 and having a screw 66c on the other end side, and a screw 66c of the case member 66.
And an overload setting adjusting member 65 that is screwed into the inner space 66b of the case member 66. The friction member is interposed between the receiving member 61 and the pressing member 62 and between the receiving portion 66a and the receiving member 61. The friction plate 63 interposed between the plate 67, the receiving member 61, and the pressing member 62, and the pressing member 62 include the receiving member 6.
It is preferable that the elastic body 64 that presses to one side is internally provided, and these members are held by screwing the adjusting member 65 to form the overload prevention unit A.

The pressing member 62 is a sleeve 62b.
And a flange 62c, and a pressing body 68 is supported by the sleeve 62b so as to be relatively non-rotatable and axially movable.
It is preferable that the friction member 69 be interposed between the pressing body 68 and the flange 62c, and that the elastic body 64 be interposed between the pressing body 68 and the overload setting adjusting member 65.

Further, a connecting portion 61 such as a spline which is non-rotatably connected to one of the motor shaft 4 and the drive shaft 52.
a, a receiving member 61 having a tubular housing 61g having a receiving portion 61f, the motor shaft 4 and the drive shaft 52 inside.
And a pressing member 6 having a shaft 62d and a large diameter portion 62e which have a connecting portion 62a such as a spline which is non-rotatably connected to the other of the above and which can be housed in the cylindrical housing 61g.
2 and a shaft portion 62d of the pressing member 62 is screwed with an overload setting adjusting member 65, and the adjusting member 65 is provided.
The friction member 70 and the elastic body 64 are interposed between the receiving portion 61f and the receiving portion 61f, and the friction member 63 is interposed between the receiving portion 61f and the large diameter portion 62e, so that the adjusting member 65 is screwed. Alternatively, the pressing member 62 may be held by the receiving member 61 to form the overload prevention unit A.

[0012]

The motor shaft 4 and the drive shaft 52 are opposed to each other between the side plates 11 and 12, and the overload prevention device 6 is provided between the motor shaft 4 and the drive shaft 52. Standard products can be used without special specifications, and the side plates 11 and 1 can be used.
Since the overload prevention device 6 can be incorporated by utilizing the space between the two, it is possible to prevent the axial dimension from increasing while using the overload prevention device 6. The problem that the gear case becomes large and the size as a whole becomes large can be solved, and yet, since the motor shaft 4 faces the drive shaft 52 between the side plates 11 and 12, the side plate 12 and the motor can be prevented. The case can be supported in a cantilever manner via bearings, and the drive shaft 52 can also be supported in a cantilever manner in the side plate 11 and the gear case via bearings. Since the overload prevention device 6 is provided between the ends of the shafts 4, 52, the shafts 4, 52
Since the shake can be suppressed and the centering can be easily performed, the problem of the conventional example due to the shake can be solved, and moreover, since the overload prevention device 6 is provided between the side plates 11 and 12, Even when the shaft 4 is provided with an electromagnetic brake or a mechanical brake, the overload prevention device 6 can be positioned on the anti-load side of the brake. Therefore, as described in the above-mentioned conventional example, the friction plate 63 is not provided. Even if the characteristics may change due to temperature changes, the problem of the luggage dropping inadvertently can be avoided, and the heat effect of the motor 3 is less likely to occur, and the slip characteristics of the overload prevention device 6, that is, The problem that the torque transmission characteristic changes can be solved.

Further, the receiving member 61 having a connecting portion such as a spline and the pressing member 62 are provided, and the case member 66 and the adjusting member 65 screwed to the case member 66 are provided, and the receiving member 61 is provided. When the member 61, the pressing member 62, the friction plates 63 and 67, and the elastic body 64 are housed in the case member 66 and held by screwing the adjusting member 65 to form the overload prevention unit A, When the side plates 11 and 12 are assembled, the unit A having the above configuration is interposed between the side plates 11 and 12, and the motor shaft 4 and the drive shaft 52 are coupled to the receiving member 61 and the pressing member 62. The overload prevention device 6 can be assembled only by fitting it to the parts 61a and 62a, and the assembling work can be facilitated accordingly, and the friction plates 63 and 67 are the case members 66. Since the interior, it can be less, such as due damage or rain or dust by an external force.

The pressing member 62 is attached to the sleeve 62b.
And the flange 62c, the sleeve 62
The pressing body 68 is supported by b, the friction member 69 is interposed between the pressing body 68 and the flange 62c, and the elastic body 6 is provided between the pressing body 68 and the overload setting adjusting member 65.
When 4 is interposed, the number of torque transmission points can be increased and the pressing force of the elastic body 64 can be transmitted evenly to the friction member 69, so that the slip load can be set accurately and easily.
A coil spring may be used as the elastic body 64.

Further, a receiving member 61 having the connecting portion 61a and the cylindrical housing 61g, and the connecting portion 62a.
A pressing member 62 having the shaft portion 62d and the large diameter portion 62e is provided, and an overload setting adjusting member 65 is screwed onto the shaft portion 62d of the pressing member 62, and the friction plate 70 is also provided.
And the elastic body 64 are provided, and they are installed inside the tubular housing 61g of the receiving member 61, and the pressing member 62 is held on the receiving member 61 by screwing of the adjusting member 65 to form the overload prevention unit A. In this case, when the unidirectional rotation transmission mechanism is provided between the motor shaft side and the drive shaft side, that is, when a mechanical brake is used as the above-mentioned brake, while obtaining the effect of unitization described above, When the hoisted load is unwound due to over-tightening of the brake, the overload prevention device 6 does not slip and cannot be unwound. That is, when a mechanical brake is used as the above-mentioned brake, if the mechanical brake is overtightened and the friction transmission force of the brake becomes larger than the friction transmission force (slip load) of the overload prevention device 6, the winding Since it is possible to prevent the overload prevention device 6 from slipping and being unable to be unwound when unwinding a load, it is possible to easily provide the negative direction rotation transmission mechanism. That is, the motor shaft 4 and the drive shaft 52 can be separated from each other when the motor 3 is rotated in the reverse direction with a simple structure in which only one negative rotation transmission mechanism B is provided between the receiving member 61 and the pressing member 62. Since it can be integrally rotated, it is possible to easily solve the problem of unwinding.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The electric hoisting and traction device shown in FIG. 2 has a pair of side plates 11 and 12 facing each other at a predetermined interval.
And a chain block body 1 composed of a motor case 13 and a gear case 14 mounted on both sides of the side plates 11 and 12, respectively, for hoisting or pulling luggage between the side plates 11 and 12 of the chain block body 1. A sheave shaft 2a having a load sheave 2 is rotatably supported and the side plates 11, 12 are
An upper hook (not shown) is attached to the upper part of the space.

A motor 3 having a stator 31 fixed to the motor case 13 and a rotor 32 rotating in the stator 31 is installed inside the motor case 13 and is held at the center of the rotor 32. Both end sides of the motor shaft 4 are rotatably supported by the side plate 12 and the side plate 13a of the motor case 13 via a pair of bearings 10 and 10, and one side shaft end portion 4a of the motor shaft 4 is supported.
Is inserted between the side plates 11 and 12. The motor 3 is a capacitor starting type motor having a starting capacitor, but its model is not particularly limited.

Further, as shown in FIG. 2, a reduction gear mechanism 5 for decelerating the rotation of the motor shaft 4 and transmitting the decelerated rotation to the load sheave 2 is provided inside the gear case 14. The reduction gear mechanism 5 has a first gear 51, a drive shaft 52 disposed on the same shaft as the motor shaft 4, a second gear 53 meshing with the first gear 51, and the second gear 53. A first intermediate shaft 55 having three gears 54 provided adjacent to,
A second intermediate shaft 58 having a fourth gear 56 meshing with the third gear 54 and a fifth gear 57 provided adjacent to the fourth gear 56, and a sixth gear 59 meshing with the fifth gear 57.
And the drive shaft 52 and the respective intermediate shafts 55, 58.
The side plate 1 of the side plate 11 and the gear case 14
4a is rotatably supported via a pair of bearings 20, 21, 22 and one side shaft end portion 2b of the sheave shaft 2a is positioned in the gear case 14 so that one side shaft end While the sixth gear 59 is provided on the portion 2b, the one side shaft end portion 52a of the drive shaft 52 is connected to the side plate 1
The motor shaft 4 is made to rush between 1 and 12 to face the one side shaft end portion 4a of the motor shaft 4, and an overload preventing device 6 is provided between the one side shaft end portions 4a and 52a. In addition, the drive shaft 52
The other end side shaft end portion 52b of the other end side shaft end portion 52b and the gear case 1 are projected to the outside of the gear case 14.
4, an electromagnetic brake 23 that operates when the motor 3 is stopped to brake the rotation of the drive shaft 52 is provided.

Therefore, the overload prevention device 6 is shown in FIG.
As shown in FIG. 5, a cylindrical receiving member 61 that is relatively non-rotatably coupled to the one-side shaft end portion 52a of the drive shaft 52, and a tubular shape that is relatively non-rotatably coupled to the one-side shaft end portion 4a of the motor shaft 4. A pressing member 62, a ring-shaped friction member 63 interposed between the opposing surfaces of the receiving member 61 and the pressing member 62, and an elastic body 64 composed of a coil spring that presses the pressing member 62 toward the receiving member 61. , And an overload setting adjusting member 65 for adjusting the pressing force of the elastic body 64.

The receiving member 61 and the pressing member 62 are sleeves 61b and 62b having splined connecting portions 61a and 62a on their inner peripheral surfaces, and the sleeves 61b and 61b.
The connecting portion 6 of the receiving member 61 is provided with outward flanges 61c and 62c protruding radially outward from one end side of 62b.
1a is spline-fitted and coupled to the outer periphery of the shaft end portion 52a, and the coupling portion 62a of the pressing member 62 is spline-fitted to the outer periphery of the shaft end portion 4a to be movably coupled in the axial direction. The friction member 63 is interposed between the flanges 61c and 62c. The flange 61c
Is provided on the other end side with respect to one end edge of the sleeve 61b, and the friction member 6 is provided on the outer circumference of one end of the sleeve 61b.
Supports 3.

On the other hand, an inner cavity portion 66b having a receiving portion 66a opposed to the flange 61c at one end and capable of receiving and holding the receiving member 61 and the pressing member 62 in an intermediate portion.
And a cylindrical case member 66 having a female screw 66c on the other end side is formed, and the inner cavity portion 6 of the case member 66 is formed.
6b includes the receiving member 61, the pressing member 62, and the friction member 63.
And an elastic body 64, and a friction plate 67 is interposed between the receiving portion 66a and the flange 61c, and the sleeve 62 is provided between the flange 62c and the elastic body 64.
A ring-shaped pressing body 68 that is not rotatable with respect to b and is movable in the axial direction, and a friction member 69 are respectively interposed between the pressing body 68 and the flange 62c.
By screwing 5 into the female screw 66c, the receiving member 61, the pressing member 62, the friction members 63, 67, 69, the elastic body 64, and the pressing body 68 are held in the case member 66 to prevent the overload prevention unit A. Is formed.

Further, the pressing body 68 is provided with an axial protrusion on one of the inner peripheral surface and the outer peripheral surface of the sleeve 62b, and on the other side with an axial recess that is coupled to the protrusion. -It is movably supported on the outer periphery of the sleeve 62d, and has a plurality of detent recesses 68a provided at its outer peripheral surface at predetermined intervals in the circumferential direction. A plurality of pin holes 66d are formed at predetermined intervals in the circumferential direction at a portion facing the presser body 68, and the detent pin 7 is inserted into the pin holes 66d and the detent recess 68a. The pressing body 68 is prevented from rotating with respect to the pressing member 62.

On the other hand, a concave rotary operation portion 65a is provided on one side surface of the adjusting member 65. In addition, as shown in FIG. 4, the case member 66 is provided on the outer peripheral side of the adjusting member 65. It is also possible to provide an annular projecting portion that projects radially outward from the end edge of the, and to provide a quadrangular or hexagonal rotation operating portion 65a on the outer periphery of this projecting portion, or as shown in FIG. On the inner peripheral side of the adjusting member 65, an annular projecting portion that projects axially outward from the edge of the case member 66 is provided, and a quadrangular or hexagonal rotation operating portion 65a is provided on the outer periphery of this projecting portion. Alternatively, as shown in FIG. 6, an annular protrusion protruding radially outward from the end edge of the case member 66 is provided on the outer peripheral side of the adjusting member 65, and the outer periphery of the protrusion is A ring consisting of a plurality of hexagonal holes that are recessed at regular intervals in the circumferential direction. The may be provided operating portions 65a,
Further, the adjusting member 65 has a small-diameter cylindrical portion having a threaded portion that is screwed into the female screw 66c, and extends radially outward from one end side of the small-diameter cylindrical portion, and the tip side thereof is in the same direction as the small-diameter cylindrical portion. It may be formed in a double-cylinder shape having a large-diameter cylindrical portion that bends to the outside, and the rotation operating portion may be provided on the outer periphery of the large-diameter cylindrical portion.

In the embodiment shown in FIG. 2, a governor switch is provided in the motor case 13 between the motor 3 and the side plate 12. That is, the governor switch is mounted on the motor shaft 4 as shown in FIG. 3, and is supported by the support 81 that rotates integrally with the motor shaft 4, and the support 81 is swingably supported by the support 81. Of the pair of weights 82 whose distal end is swung outward in the radial direction of the motor shaft 4 under the action of centrifugal force due to the rotation of the motor, and the weights 82 interposed between the weights 82. A spring 83 for urging the weight 82 inward in the radial direction and an interlocking portion 84a interlocking with the swing of the weight 82 are provided, and are linked with the swing of the weight 82 in the axial direction of the motor shaft 4. It comprises a governor 8 having a reciprocating working disc 84, and a switch device 24 for turning on and off a starting capacitor of the motor 3 following the operation of the governor 8. Driving and stopping the motor 3 The governor 8 is operated in response to the operation. , So that the action of the switch device 24.
The switch device 24 includes a winding-up switch 24a that is always on and a winding-down switch 2 that is always on.
4b and the operation disk 84 of the governor 8 to follow the operation of the hoisting lower side switch 24b at the time of hoisting, and the hoisting upper side switch 24a is turned off, and at the time of hoisting, the hoisting upper side switch 24a On-operation is maintained and the lower side switch 24b
And a switch operation plate 24c for turning off the motor 3 for switching the drive of the motor 3 to the upper side of the winding operation and for switching the drive of the motor 3 to the lower side of the winding operation. The starting capacitor can be activated immediately.

Further, in FIG. 1, 25 is a retaining ring for preventing the detent pin 7 from falling out of the pin hole 66d, and
In FIG. 3, 80 is the governor 8 and the switch device 24.
The cover 26 is a chain guide having a chain passage for guiding the chain hanging on the load sheave 2, and is attached to the lower side of the load sheave 2 between the side plates 11 and 12. Further, 27 is a chain retainer for preventing the chain from coming off the load sheave 2.

Next, the operation of the embodiment configured as described above will be described.

When carrying out the work of hoisting a load, the motor 3 is driven, and the motor shaft 4 is rotated by the drive of the motor 3, and the rotational power is generated by the overload prevention device 6 and the reduction gear mechanism. It is transmitted from the drive shaft 52 of No. 5 to the load sheave 2 via the first gear to the sixth gear, and the load sheave 2 can be rotated to wind up the load.

Also, when carrying out the work of winding up the luggage,
When a load greater than the slip load set by the overload prevention device 6 acts on the load sheave 2, the load sheave 2 slips between the receiving member 61 and the pressing member 62 of the overload prevention device 6 to rotate the motor shaft 4. Power is not transmitted to the drive shaft 52. When the motor 3 is driven, the electromagnetic brake 23 is not energized, so that the electromagnetic brake 23 does not operate. Further, the pulling work can be performed by driving the motor 3 similarly to the winding work.

As described above, the motor shaft 4 and the drive shaft 52
Since the overload prevention device 6 is provided between the motor 3 and
The standard product can be used without special specifications, and even when the brake 23 for braking the rotation of the drive shaft 52 is provided as shown in FIG. Even if the characteristics of the friction members 63, 67, 69 of the overload prevention device 6 change due to temperature change, the brake 23 can be operated and the luggage is prevented from being dropped inadvertently. You can do it.

Further, the motor shaft 4 and the drive shaft 52 are placed between the side plates 11 and 12 to face each other, and the overload prevention device 6 is provided between the motor shaft 4 and the drive shaft 52. Since the space between the side plates 11 and 12 supporting 2 can be effectively utilized to incorporate the overload prevention device 6, therefore, the axial dimension becomes long while using the overload prevention device 6. Therefore, it is possible to solve the problem that the motor case and the gear case become large in size and the size becomes large as a whole as in the conventional example described above. Moreover, the motor shaft 4
Is opposed to the drive shaft 52 between the side plates 11 and 12, so that the side plate 12 and the side plate 13a of the motor case 13 can be supported in a cantilevered manner via the bearing 10 and can also be driven. The shaft 52 can also be supported on both the side plate 11 and the gear case 14 via the bearing 20 in a cantilevered manner, and the overload preventing device can be provided between the ends of the shafts 4 and 52 thus supported. Since 6 is provided, the drive shaft 52 is arranged on the same axis as the motor shaft 4, but the shake of each of the shafts 4 and 52 can be suppressed and the centering can be easily performed. The problems of the above-mentioned conventional example can be solved.

Since the overload prevention device 6 is provided between the side plates 11 and 12, in other words, it is not installed inside the motor case 13, the overload prevention device 6 is affected by the heat of the motor 3. Therefore, the problem that the torque transmission characteristic of the overload prevention device 6 changes can be solved.

Even when the governor switch is provided on the motor shaft 4, a part of the governor switch can be arranged in the space inside the coil end 33 of the motor 3, so that the governor switch is provided. The axial length can be shortened.

Further, the overload prevention device 6 includes a receiving member 6
Since the unit 1, the pressing member 62, the friction members 63, 67 and 69, the elastic body 64, and the overload setting adjusting member 65 are held in the case member 66, when the side plates 11 and 12 are assembled, These side plates 11, 1
The one end side shaft end portion 4a of the motor shaft 4 is fitted to the coupling portion 62a of the pressing member 62 while the overload prevention unit A is interposed between the two, and the one end side shaft end portion 52a of the drive shaft 52 is provided. The overload preventing device 6 can be assembled by simply fitting the above into the coupling portion 61a of the receiving member 61, and the assembling work can be facilitated accordingly, and the friction members 63, 67, 69 are Since the case member 66 is provided internally, it is possible to reduce the damage due to external force and the effects of rainwater, dust, and the like.

Further, the sleeve 62b of the pressing member 62
The pressing member 68 is supported by the friction member 69 between the pressing member 68 and the flange 62c, and the elastic member 6 is interposed between the pressing member 68 and the overload setting adjusting member 65.
When 4 is interposed, the number of torque transmission points can be increased and the pressing force of the elastic body 64 can be transmitted evenly to the friction member 69, so that the slip load can be set accurately and easily.
A coil spring may be used as the elastic body 64.

In the embodiment shown in FIG. 1, the receiving member 61
And flanges 61c and 62c provided on the pressing member 62,
Although the flanges 61c and 62c are provided so as to be orthogonal to the axial center, the flanges 61c and 62c may be inclined with respect to the axial center, and the friction member 63 may be interposed between the inclined flanges. In this case, it is easy to set a large sliding load as compared with FIG.

Next, another embodiment of the overload prevention device provided between the motor shaft 4 and the drive shaft 52 will be described with reference to FIGS. 8 and 9.

The overload prevention device 6 of this embodiment has a ring-shaped coupling body 61d having a coupling portion 61a coupled to the one side shaft end portion 52a on the inner peripheral surface, and a cylinder coupling to this coupling body 61d. A receiving member 61 including a tubular housing 61g having a portion 61e and a receiving portion 61f that projects radially inward from the tip end side of the tubular portion 61e, and the one side shaft end portion 4a on the inner peripheral surface. A cylindrical shaft portion 62d which has a coupling portion 62a for coupling with the cylindrical housing 61g and can be installed in the cylindrical housing 61g.
And a pressing member 62 having a large-diameter portion 62e that projects radially outward from one end of the shaft portion 62d. The shaft portion 62d of the pressing member 62 has a ring-shaped overload setting adjusting member 6
5, the adjusting member 65 and the receiving portion 61 are screwed together.
A ring-shaped friction member 70 and an elastic body 64 formed of a disc spring are interposed between the ring-shaped friction member 70 and the ring-shaped friction member 63, and a ring-shaped friction member 63 is interposed between the receiving portion 61f and the large diameter portion 62e.
The overload prevention unit A is formed by holding the pressing member 62 on the receiving member 61 by screwing the adjusting member 65 onto the shaft portion 62d.
The same reference numerals are used as in the embodiment shown in FIG.

The receiving member 61 is the tubular housing 6
A plurality of screw holes 61h are provided on one end side of 1g, and
Through holes 61j corresponding to the screw holes 61h are provided in the combined body 61d, and a screw body 70 that is inserted into the through holes 61j is tightened in the screw holes 61h to connect the tubular housing 61g and the combined body 61d. It is detachably connected.

Further, the shaft portion 62d of the pressing member 62 is provided with a male screw 62f to which the adjusting member 65 is screwed and a rotation stopping groove 62g extending in the axial direction on the outer peripheral surface on the other end side. As shown in FIG. 9, a unidirectional rotation transmission portion 62h is provided between the rotation stop groove 62g and the large diameter portion 62e.

Then, a ring-shaped pressing body 68 is supported between the friction member 70 and the elastic body 64 on the shaft portion 62d, and an engaging projection formed on the inner peripheral surface of the pressing body 68 is provided with the engaging projection. The shaft portion 6 of the pressing body 68 is engaged with the stop groove 62g.
While preventing rotation with respect to 2d, a pin hole 61k is provided on the inner peripheral surface of the receiving portion 61f of the cylindrical housing 61g, and a transmission pin 72 that engages with the −direction rotation transmission portion 62h is provided in the pin hole 61k. A spring 73 for constantly urging the transmission pin 72 toward the shaft portion 62d is provided inside, and the reverse rotational power of the motor shaft 4 is transmitted in the negative direction by the negative direction rotational transmission portion 62h and the transmission pin 72. It is adapted to be transmitted to the receiving member 61 via the mechanism B.

However, in the embodiment shown in FIGS. 8 and 9, the same effect as that shown in FIG.
As disclosed in Japanese Unexamined Patent Publication No. 3-38234, even when a mechanical brake is provided on, for example, the first intermediate shaft 55 of the reduction gear mechanism 5, the overload prevention device 6 slips when the loaded luggage is unwound. It is possible to surely lower the lowering without stopping the lowering. That is, when a mechanical brake is used as the above-mentioned brake, the mechanical brake is overtightened, and the friction transmission force of the mechanical brake causes the overload prevention device 6 to operate.
When the load is larger than the friction transmission force (slip load) of the motor 3, the overload prevention device 6 slips and the reverse rotation power of the motor shaft 4 is applied to the drive shaft 52 when the motor 3 is rotated in the reverse direction to lower the wound load. Although it cannot be transmitted, it becomes impossible to lower it. However, by providing the-direction rotation transmission mechanism B, the motor shaft 4 and the drive shaft 52 can be integrally rotated at the time of lowering by the reverse rotation of the motor 3. Therefore, it is possible to surely lower it. Since the receiving member 61 is provided with the receiving portion 61f and the receiving portion 61f is provided between the receiving portion 61f and the shaft portion 62d of the pressing member 62, the-direction rotational transmission mechanism B can be easily formed. .

In the embodiment shown in FIG. 8 as well, FIG.
As shown in 0, the receiving portion 61f of the tubular housing 61g
Also, the facing surface of the pressing body 68 may be inclined with respect to the axis, and the friction member 70 may be interposed between these inclined surfaces. In this case, it is easy to set a large sliding load as compared with FIG.

In the embodiment shown in FIGS. 1 and 8, the receiving member 61 is connected to the drive shaft 52 and the pressing member 62 is connected to the motor shaft 4, but it may be connected to the opposite. ,
Further, the receiving member 61 and the pressing member 62 may be connected by spline connection or may be connected by using a key, for example, and the connecting means is not particularly limited.

[0044]

As described above, the present invention makes the motor shaft 4 and the drive shaft 52 arranged on the same shaft as the motor shaft 4 face each other between the side plates 11 and 12, and drives the motor shaft 4 and the side plates 11 and 12. Since the overload preventing device 6 is provided between the side plate 1 and the shaft 52, a standard product can be used without specializing the motor 3.
Using the space between 1 and 12, the overload prevention device 6
Therefore, it is possible to suppress an increase in the axial dimension while using the overload prevention device 6, and the motor case and the gear case are large-sized as in the conventional example, and the overall size is large. It can solve the problem of shaping. Moreover, since the motor shaft 4 faces the drive shaft 52 between the side plates 11 and 12, the side plate 12 and the motor case can be supported in a cantilever manner via bearings, and the drive shaft can also be supported. 5
2 can also be supported by the side plate 11 and the gear case via bearings in a cantilevered manner, and the overload prevention device 6 can be provided between the ends of the shafts 4 and 52 thus supported in a cantilevered manner.
Since the shafts 4 and 52 are prevented from swinging, the centering can be easily performed, and the problem of the conventional example due to the swinging can be solved. Since the load prevention device 6 is provided,
Even when the drive shaft 4 is provided with an electromagnetic brake or a mechanical brake, the overload prevention device can be positioned on the anti-load side of the brake. Therefore, as described in the above-mentioned conventional example, the friction plate 71 is provided. However, even if the characteristics may change due to temperature changes, the problem of the luggage dropping inadvertently can be avoided, and the heat effect of the motor 3 is less likely to occur, and the slip characteristics of the overload prevention device, that is, The problem that the torque transmission characteristic changes can be solved.

Further, the receiving member 61 having a connecting portion such as a spline and the pressing member 62 are provided, and the case member 66 and the adjusting member 65 screwed to the case member 66 are provided to provide the receiving member. The member 61, the pressing member 62, the friction member 63, and the elastic body 64 are connected to the case member 66.
In the case where the overload prevention unit A is formed by being installed inside and is held by screwing the adjusting member 65, the side plates 1 and 12 are assembled at the time of assembly.
The above-mentioned overload prevention is achieved by simply inserting the unit A having the above configuration between the first and the second 12 and fitting the motor shaft 4 and the drive shaft 52 into the respective connecting portions 61a and 62a of the receiving member 61 and the pressing member 62. The device 6 can be incorporated, and the assembling work can be facilitated accordingly, and since the friction members 63 and 67 are incorporated in the case member 66, damages due to external force and influences from rainwater, dust, etc. can be reduced. .

Further, the pressing member 62 is attached to the sleeve 62b.
And the flange 62c, the sleeve 62
The pressing body 68 is supported by b, the friction member 69 is interposed between the pressing body 68 and the flange 62c, and the elastic body 6 is provided between the pressing body 68 and the overload setting adjusting member 65.
When 4 is interposed, the number of torque transmission points can be increased and the pressing force of the elastic body 64 can be transmitted evenly to the friction member 69, so that the slip load can be set accurately and easily.
A coil spring may be used as the elastic body 64.

Further, a receiving member 61 having a coupling portion 61a and a tubular housing 61g having a receiving portion 61f, a coupling portion 62a, a shaft portion 62d which can be housed in the tubular housing 61g, and a large diameter. Holding member 6 having a portion 62e
2 is provided, the overload setting adjusting member 65 is screwed into the shaft portion 62d of the pressing member 62, and the friction plates 63 and 70 and the elastic body 64 are provided, and the tubular housing 61g of the receiving member 61 is internally provided. However, when the pressing member 62 is held on the receiving member 61 by the screwing of the adjusting member 65 to form the overload prevention unit A, while the operation effect due to the unitization is obtained, the motor shaft side is obtained. Even in the case where the-direction rotation transmission mechanism is provided between the drive shaft side and the drive shaft side, the-direction rotation transmission mechanism can be easily provided between the receiving member 61 and the presser pressing member 62.

[Brief description of drawings]

FIG. 1 is an enlarged cross-sectional view of only a main part showing an embodiment of a hoisting and pulling device of the present invention.

FIG. 2 is a partial sectional view in which a part of the hoisting and pulling device is omitted.

FIG. 3 is an enlarged sectional view of only a motor side portion.

4 is a partial cross-sectional view showing another embodiment of the overload prevention device of FIG.

5 is a partial cross-sectional view showing another embodiment of the overload prevention device of FIG.

6 is a partial cross-sectional view showing another embodiment of the overload prevention device of FIG.

7 is a partial cross-sectional view showing another embodiment of the overload prevention device of FIG.

FIG. 8 is an enlarged cross-sectional view showing still another embodiment of the overload prevention device.

9 is a cross-sectional view taken along the line XX of FIG. 8 in which the motor shaft is omitted.

10 is a partial cross-sectional view showing another embodiment of the overload prevention device of FIG.

[Explanation of symbols]

 11 and 12 Side plate 2 Load sheave 3 Motor 4 Motor shaft 52 Drive shaft 6 Overload prevention device 61 Receiving member 61a Coupling part 62 Holding member 62a Coupling part 62b Sleeve 62c Flange 63, 67 Friction member 64 Elastic body 65 Overload setting adjustment Member 66 Case member 66a Receiving part 66b Lumen part 66c Screw

Claims (4)

[Claims] 1. A motor 3, a motor shaft 4 driven by the motor 3, a drive shaft 52 arranged on the same axis as the motor shaft 4 and interlocking with the motor shaft 4, and interlocking with the drive shaft 52. In the electric hoisting and traction device including the driven load sheave 2, the motor shaft 4 and the drive shaft 52 are placed between the side plates 11 and 12 to face each other, and the motor shaft 4 and the drive shaft 52 are opposed to each other. And a receiving member 61 that is coupled to one of the motor shaft 4 and the drive shaft 52 such that the motor shaft 4 and the drive shaft 52 cannot rotate relative to each other.
A pressing member 62 connected to the other so as not to rotate relative to each other and a friction member 6 interposed between the receiving member 61 and the pressing member 62.
3 and an overload prevention device 6 including an elastic body 64 for pressing the pressing member 62 toward the receiving member 61 and an overload setting adjusting member 65 for adjusting the pressing force of the elastic body 64. A characteristic electric hoisting device. 2. A receiving member 61 having a connecting portion 61a such as a spline that is non-rotatably connected to one of the motor shaft 4 and the drive shaft 52, and a connecting portion 62a such as a spline that is non-rotatably connected to the other. The holding member 62 and the receiving portion 66a facing the receiving member 61 on one end side, and the inner cavity portion 6 capable of holding the receiving member 61 and the holding member 62 in the middle portion.
The case member 66 includes a case member 66 having 6b and a screw 66c on the other end side, and an overload setting adjusting member 65 screwed to the screw 66c of the case member 66.
The receiving member 61 and the pressing member 62, and the friction member 67 interposed between the receiving member 66a and the receiving member 61, and the receiving member 61 and the pressing member 62 in the inner cavity portion 66b. A friction plate 63 and an elastic body 64 that presses the pressing member 62 toward the receiving member 61 are internally provided, and each of these members is held by being screwed with the adjusting member 65 so as to prevent overload prevention unit A.
The electric hoisting and pulling device according to claim 1, wherein 3. A pressing member 62 includes a sleeve 62b and a flange 62c, and a pressing body 68 is supported by the sleeve 62a so as to be relatively non-rotatable and axially movable. The friction member 69 is interposed between the pressing member 68 and the overload setting adjusting member 6
The electric hoisting and pulling device according to claim 2, wherein an elastic body 64 is interposed between the electric hoisting and pulling device. 4. A receiving member 61 having a connecting portion 61a, such as a spline, which is fixed to one of the motor shaft 4 and the drive shaft 52 so as not to rotate relative to one another, and a tubular housing 61g having a receiving portion 61f. A pressing member that has a connecting portion 62a such as a spline that is connected to the other of the motor shaft 4 and the drive shaft 52 so as not to rotate relative to it, and has a shaft portion 62d and a large diameter portion 62e that can be housed in the cylindrical housing 61g. 62, a shaft portion 62d of the pressing member 62 is screwed with an overload setting adjusting member 65, and a friction member 70 and an elastic body 64 are interposed between the adjusting member 65 and the receiving portion 61f. Further, the friction member 63 is interposed between the receiving portion 61f and the large diameter portion 62e, and the pressing member 62 is held on the receiving member 61 by the screwing of the adjusting member 65 so that the overload preventing unit A is Forming Motomeko 1 Electric hoisting and pulling device according.