JPH01239213A - Brake device for elevator - Google Patents

Abstract

PURPOSE:To make a device compact in construction by providing an input and output shafts on one central shaft and providing a mechanical brake and fastening force increasing and retaining brake on the same shaft. CONSTITUTION:An input shaft 2 and output shaft 4 of a brake device 3 is opposed to each other on one central shaft 19. As a reveral rotation preventing mechanism, a cam clatch for mechanical brake and a ratchet plate 36 for fastening force retaining brake are respectively used and arranged on the same shaft. It is thus passible to make the device compact in construction.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a brake device for a self-weight-lowering type lifting device, such as a water gate opening/closing device, that raises and lowers a load and presses the load against the floor surface. be.

[Conventional technology]

Conventionally, this type of device, for example, in a manual water gate opening/closing device, uses a mechanical brake or a centrifugal brake to lower the water gate under its own weight, and after the water gate reaches the bottom of the water, it is further closed with a handle to prevent water leakage. It was necessary to press down on the water-tight rubber provided on the lower edge of the water gate to retighten it and maintain the retightened condition.

For this purpose, a mechanism as shown in, for example, Japanese Patent Laid-Open No. 62-35159 has been proposed.

[Problem to be solved by the invention]

However, in such conventional devices, the input shaft and output shaft are arranged parallel to each other, and torque is transmitted between the two shafts using external gears, which requires space perpendicular to the shaft, making the device large. In addition, there were other problems, such as the processing and assembly of the gearbox being complicated.

The present invention solves the problems of these conventional devices, and provides a brake device for lifting AM that has a mechanical brake action when the load is lowered and a pressing force holding brake action that keeps the load pressed against the floor surface. Therefore, it is an object of the present invention to provide a device that is small in size and whose gearbox is easy to process and assemble.

(Means for Solving the Problems) The present invention provides a brake device inserted into a rotational driving force transmission mechanism of a gravity-lowering type lifting device that lifts and lowers a load using rotational driving force manually or by a prime mover and gravity. , an input shaft and an output shaft are arranged facing each other on one central axis, and a friction plate having a friction surface on the side facing the shaft end is fixed to each of the input shaft and output shaft, and A reversal prevention mechanism is provided on the shaft end side of the friction plate of the shaft and is rotatably supported around the respective shafts and has mutually opposite allowable rotational directions, and is provided with One shaft is provided with a screw, and the other shaft is provided with a shaft side member of a sliding shaft joint that transmits torque and is movable relatively in the axial direction, and a sliding side member of the sliding shaft joint. A braking device for an elevating device is characterized in that a nut portion that engages with the screw is integrally provided, and both end faces in the axial direction are provided with friction surfaces to form a movable friction body.

[For production]

The present invention provides an input shaft and an output shaft that fix friction plates and are provided with a reversal prevention mechanism between each friction plate and the shaft end that is rotatable with respect to the shaft and has mutually opposite allowable rotation directions. are arranged facing each other in a straight line, and a screw/Nand mechanism and a sliding shaft joint (a shaft joint that transmits torque but is relatively movable in the axial direction) are provided at each end of both wheels. By integrating the slider and the sliding body of the sliding shaft joint into a movable friction body, the mechanical brake action part can also be used as a pressing force holding brake (in the case of a water gate opening/closing device) that keeps the load pressed against the floor surface. The operating part (force retention brake) is also arranged compactly on the same axis where the input and output shafts are arranged, and the space perpendicular to the axis is small, and the input axis is arranged on a separate axis parallel to the axis. Since the gearbox does not have a large number of shaft holes, the number of shaft holes in the gearbox is eliminated, making processing and assembly easier.

〔Example〕

Embodiments of the present invention will be described using the drawings.

FIG. 4 shows an example of the arrangement of the brake device of the present invention. Figure 4 shows an example of a driving force transmission mechanism from the handle of a manual water gate opening/closing device to a part of the gear device, where l is the manual handle, 2 is the input shaft, and 3 is the brake device according to the present invention. , 4 is the output shaft, 5 is the multi-disc clutch, 6 is the pinion shaft, 7 is the centrifugal brake, 8 is the pinion, 9 is the gear that meshes with it, IO is the pinion, and the subsequent gear mechanism,
Binions and rack mechanisms that raise and lower the water gate are omitted.

As described later, when the multi-disc clutch 6 is connected and the handle 1 is turned in the opening direction 11, the water gate opens (sluice gate door rises), and when it is turned in the closing direction 12, the water gate is closed (sluice gate door descends). When the multi-disc clutch 5 is disengaged, the sluice gate descends under its own weight at a predetermined speed by the action of the centrifugal brake 7.

The details of the brake device 3 will be explained with reference to FIG.

The input shaft 2 is rotatable by rolling bearings 16 and 17 on the flange metal 15 attached to the gear box 13 of the lifting device via the casing 14 of the brake device 3.
and is fixedly supported in the axial direction. The output shaft 4 is rotatably and fixedly supported in the axial direction by a rolling bearing 18 provided in the casing 14 and a rolling bearing (not shown) provided in the multi-disc clutch 5. .

The human power shaft 2 and the output shaft 4 are arranged facing each other on one central shaft 19, and a guide hole 20 provided at the shaft end of the input shaft 2 is provided at the shaft end of the output shaft 4. The guide bin 21 is fitted in such a way that it can rotate relative to each other to prevent the centers of both wheels from shifting.

The input shaft 2 and the output shaft 4 each have a friction surface 22, 23 on the side facing the shaft end. ! A rubbing plate 24°25 is fixed.

A screw 26 (left-hand thread) is provided at the shaft end of one of the output shafts 4 of the two wheels, and the shaft end of the other shaft, the human power shaft 2, is capable of transmitting torque and sliding relatively in the axial direction. A spline shaft 27 is provided as a shaft side member of a spline type shaft joint which is a sliding shaft joint.

The spline boss 28 as a sliding member of the spline fiber is integrally formed with a nut portion 29 that engages with the screw 26, and friction surfaces 30.3 are formed on both end surfaces in the axial direction.
1, a moving friction body 32 is formed.

A cam clutch 33 serving as a reverse rotation prevention mechanism is rotatably supported around the human power shaft 2 between the movable friction body 32 and the friction plate 24 . Brake linings 34 and 35 are provided on both axial end surfaces of the cam clutch 33.

On the other hand, a ratchet plate 36 serving as a reversal prevention mechanism is rotatably supported around the output shaft 4 between the movable friction body 32 and the friction plate 25. Brake linings 37 and 38 are provided on both sides of the ratchet plate 36.

Therefore, as will be described later, the cam clutch 33 allows the inner ring to rotate in the opening direction 11, and is prevented from rotating in the closing direction 12. On the other hand, the ratchet plate 36 is in the closing direction 12 as described later.
rotation in the opening direction 11 is permitted, and rotation in the opening direction 11 is prevented.

That is, the permissible rotational directions of the cam clutch 33 and the ratchet plate 36 are opposite to each other.

Regarding the cam clutch 33, numeral 39 is a pressure bonding plate having a U-shaped cross section, and is rotatably supported on the input shaft 2. The crimp plate 39 consists of members 48 and 49,
The keys 50 are formed integrally with each other in the direction of rotation. 40 is an outer ring, and a large number of cams 41 are arranged and housed along the circumference between the outer ring and the cylindrical portion of the pressure bonding plate 39 forming the inner ring. 58 is a removable key that fixes the outer ring 40 to the casing 14. The cam 41 is the key 5
When the outer ring 40 is fixed by 8, the crimp plate 39 is allowed to rotate in the opening direction 11, but is prevented from rotating in the closing direction 12.

To explain the ratchet plate 36, as shown in FIG.
2, and a ratchet pawl 45 rotatably provided on the casing 14 by a pin 43 and biased by a spring 44.
As a result, the ratchet plate 36 is allowed to rotate in the closing direction 12, but is prevented from rotating in the opening direction 11.

Since the screw 26 is a left-handed screw, it functions as follows. That is, if the direction of the torque generated by the weight of the load (sluice gate) is the direction of gravity action 46, then when the output shaft 4 is rotated in the direction of gravity action 46 relative to the input shaft 2, the screw 29 ( The movable friction body 32 is
The cam clutch 33, which is a reversal prevention mechanism that does not allow rotation in the direction of gravity action 46, is approached, and the cam clutch 33, which is a reversal prevention mechanism that does not allow rotation in the direction of gravity action 46, is pressed against the Fj rubbing surface 30 and the brake lining 35, and the cam clutch 33 is pressed against the crimping plate 39 in the direction of gravity action 4.
6 torque will be transmitted. However, rotation in this direction is prevented by the action of the cam clutch 33 described above.

Conversely, if the output shaft 4 is rotated in the anti-gravity direction 47 relative to the input shaft 2, the screw 29
The moving friction body 32 approaches the ratchet plate 36, which is a reversal prevention mechanism that does not allow rotation in the anti-gravity action direction 47, and presses against it, thereby transmitting the torque in the anti-gravity action direction 47. However, due to the action of the ratchet plate 36 mentioned above,
Rotation in this direction is prevented.

The operation of the brake device configured as above will be explained.

First, the operation of opening and closing the water gate (lifting and lowering the water gate door) will be explained.

If we start by turning the handle l in the opening direction 11 and the water gate starts to rise, at this time the output shaft 4 will move in the gravitational direction 4 relative to the human power shaft 2 due to the weight of the water gate.
6, the movable friction body 32 moves to the left by the action of the left-handed screw 26, contacts and presses the cam clutch 33, and the screw 26 and nut portion 29
is in a locked state. Therefore, the torque of handle 1 is
Output shaft 4 via spline shaft 27 and spline boss 28
, and the floodgates will rise. At this time, since the cam clutch 33 is in a free state, it does not prevent the rotation of the handle 1 in the opening direction 11.

When the handle l is stopped and the hand is released, the torque from the spline shaft 27 disappears, but since the moving friction body 32 presses the cam clutch 33 against the friction plate 24, they are united by friction, and the action of the cam clutch 33 is reduced. direction of gravity action 4
6 is prevented from rotating. Therefore, even if you release your hand, the water gate will remain open without falling.

When a closing torque 12 is applied to the handle 1 to lower the water gate door, the output shaft 4 is moved to the input shaft 2 by mechanical braking action by the friction plate 24, cam clutch 33, spline shaft 27, movable friction body 32, and screw 26. The sluice gate rotates following the rotation of the sluice gate, and the sluice gate descends without receiving its own weight on the handle l.

When the lower end of the water gate reaches the bottom of the water, its own weight crushes the watertight rubber, and when the reaction force from the deformation of the watertight rubber and its own weight are balanced, the descent due to its own weight stops.

Next, the retightening operation will be explained.

When the handle 1 is further turned in the closing direction 12 from the above state, the output shaft 4 remains stopped rotating due to the reaction force of the watertight rubber. That is, the output shaft 4 rotates in the anti-gravity direction 47 relative to the input shaft 2. Then,
Due to the action of the screw 26, which is a left-hand thread, the movable friction body 32 approaches the ratchet plate 36, which is a reversal prevention mechanism that does not allow rotation in the anti-gravity action direction 47, and presses it between it and the friction plate 25, and the screw 26 is locked. In this state, the torque of the handle l is transmitted to the water gate, crushing the watertight rubber and applying a linear force. At this time, since the ratchet plate 36 is free, it does not interfere with the rotation of the output shaft 4.

Note that this linear force is transmitted to the handle 1 as a reaction, so the magnitude of the linear force can be confirmed by the feel of the handle.

When the water-tight rubber is compressed to the extent that the water-tight rubber is sufficiently retightened and the handle l is released, the movable friction body 32 is moved against the friction plate 25 by the action of the screw 26 due to the torque based on the reaction force from the water-tight rubber. Since the ratchet plate 36 is held integrally between them and rotation in the anti-gravity direction 47 is prevented by the action of the ratchet pawl 45, the watertight rubber is maintained in a compressed state. , the term line force is maintained. That is, the action of the force holding brake is performed.

Next, when raising the water gate again, by turning the handle l in the opening direction 11, the movable friction body 32 tries to move to the left, and the restraint due to friction with the ratchet plate 36 is loosened, but due to the reaction force from the watertight rubber. Since the output shaft 4 is still rotated in the anti-gravity direction 47, the output shaft 4 follows the rotation of the input shaft 2, the water gate rises, the deformation of the watertight rubber is recovered, and the reaction force becomes small. This results in a balance with the water gate's own weight.

If the handle 1 is further turned in the opening direction 11, the water gate returns to its original state and the water gate rises.

As described above, the mechanical brake mechanism using the cam clutch 33 and the linear force holding brake using the ratchet plate 36 are compactly arranged on the central axis of one input shaft and output shaft. Ru.

FIG. 3 shows another embodiment, in which a flange coupling that allows relative movement in the axial direction is used as the sliding shaft coupling.

A coupling flange 53 is fixed to the shaft end of the input shaft 2 as a shaft side member by a square shaft 51 and a snap ring 52, and a plurality of coupling bins 54 are held on the same circumference. 55 is a coupling flange as a sliding side member, and a plurality of holes 56 corresponding to the coupling bins 54 are provided.
is provided, the inner diameter thereof is a nut portion 29 that is screwed into the screw 26 (left-hand thread), and the surface facing the brake lining 37 is a friction surface 31.

57 is a brake disc fixed to the coupling flange 55, and the surface facing the brake lining 35 is the friction surface 30.

The coupling flange 55, the nut portion 29, and the brake disc 57 together form the movable friction body 32. The movable friction body 32 can move relative to the coupling flange 53 to some extent in the axial direction, and transmits torque through the coupling pin 54 and the hole 56 in the rotational direction.

The operation of the moving friction body 320 regarding the mechanical brake using the cam clutch 33 and the linear force holding brake using the ratchet plate 36 is the same as in the embodiment shown in FIG.

FIG. 3 shows a state in which the friction surfaces 31 are in contact and there is a gap on the friction surfaces 30 in the nuchal line operation state.

In the above embodiment, as the reverse rotation prevention mechanism, the cam clutch 33 is used for the mechanical brake, and the ratchet plate 36 is used for the line force retention brake, and in this way, the water gate door is raised and lowered quietly. At the nuchal line, it makes a ratcheting sound, increasing 11! You can confirm that the work is in progress not only by the feel of the handle, but also by the sound.

However, the arrangement of the reverse prevention mechanism is not limited to this.
They may be replaced, both may be of the same type, or other types of reverse prevention mechanisms may be used.

Contrary to the embodiments shown in Figs. 1 and 3, the mechanical brake may be provided on the output shaft side, and the brake for maintaining the linear force may be provided on the input shaft side. on the side,
The screw/Nand mechanism may be provided on the human-powered shaft.In any combination, when the output shaft rotates in the direction relative to the input shaft, the movable friction body is rotated in the direction. Select the direction of the screw so that it approaches the anti-reverse mechanism that does not allow this.

Note that the driving force to the input shaft may be provided by a prime mover such as a motor or an engine.

As a load, it can be applied to items other than water gates that need to be pressed against the floor in addition to being lifted and lowered.

〔Effect of the invention〕

According to the present invention, the input shaft and the output shaft are arranged on one central axis, and the mechanical brake and the linear force holding brake can also be arranged on the same one axis, resulting in an extremely compact structure. The number of shaft holes in the box is also reduced, making machining and assembly easier, which is extremely effective.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of an embodiment of the present invention, and FIG. 2 is an I-
FIG. 3 is a side view of the ratchet plate and ratchet pawl seen along a line, FIG. 3 is a longitudinal sectional view of another embodiment, and FIG. 4 is an explanatory view showing an example of the arrangement of the brake device. DESCRIPTION OF SYMBOLS 1... Handle, 2... Input shaft, 3... Brake device, 4... Output shaft, 5... Multi-plate flanch, 6...
・Pinion shaft, 7... Centrifugal brake, 8... Pinion, 9... Gear, 10... Binion, 11... Opening direction, 12... Closing direction, 13... Gear box, 14...Casing, 15...Flange metal,
16... Rolling bearing, 17... Rolling bearing, z8...
Rolling bearing, 19... Central shaft, 20... Guide hole, 2
DESCRIPTION OF SYMBOLS 1... Guide pin, 22... Friction surface, 23... Friction surface, 24... Friction plate, 25... Friction plate, 26...
・Screw, 27... Spline shaft, 28... Spline boss, 29... Nut part, 30... Friction surface, 31
... Friction surface, 32 ... Moving friction body, 33 ... Cam clutch, 34 ... Brake lining, 35 ...
Brake lining, 36... Ratchet plate, 37.
...Brake lining, 38...Brake lining, 39...Crimp plate, 40...Outer ring, 41...Key, 42...Ratchet tooth, 43...Pin, 44...
... Spring, 45... Ratchet pawl, 46... Gravity action direction, 47... Anti-gravity action direction, 48... Member,
49... Member, 5o... Key, 51... Square shaft, 5
2... Snap ring, 53... Coupling flange, 54... Coupling pin, 55... Coupling flange, 56... Hole, 57... Brake disc, 5B... Key.

Claims (1)

[Claims] (1) In a braking device inserted into the rotational force transmission mechanism of a weight-lowering lifting device that raises and lowers a load using rotational driving force and gravity from a manual or prime mover, the input shaft and output shaft are aligned. A friction plate is arranged facing each other on the central axis, and a friction plate having a friction surface on the side facing the shaft end is fixed to each of the input shaft and the output shaft, and a friction plate is fixed to the shaft end side of the friction plate of each shaft. , a reversal prevention mechanism is provided that is rotatably supported around each shaft and has mutually opposite allowable rotation directions, and one of the input shaft and the output shaft is provided with a screw,
A shaft-side member of a sliding shaft joint is provided on the other shaft to transmit torque and to be relatively slidable in the axial direction, and the sliding-side member of the sliding shaft joint has a nut portion that engages with the screw. What is claimed is: 1. A brake device for a lifting device, characterized in that a movable friction body is formed by integrally provided with a friction surface on both end faces in the axial direction.