JPS6230335B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a reverse action coupling device, such as a so-called reverse action brake or a reverse action clutch, which maintains a connected state by the strong pressing force of a built-in spring.

In general, this type of coupling device is classified as a direct-acting type or a reverse-acting type, depending on whether it is brought into a connected state or a released state by controlling a driving force source (electromagnetic attraction force, fluid pressure). Since the reverse action coupling device is normally connected by the pressing force of a built-in spring, it will not be able to be released if some kind of accident occurs to the driving force source.

For example, with a positive action coupling device,
"Engine clutch device" shown in Publication No. 20875
If this is the case, the clutch device can be removed from the main engine and the serration fitting portion can be disengaged, but with a reverse action coupling device, it is stopped in the engaged state, so
Prompt release required.

Here, the reverse action coupling device has a hub mounted on the rotating shaft that allows integral rotation via a key and is prevented from coming off with a snap spring, etc., and a disk is attached to the outer periphery of the hub. It is conceivable that the coupling can be released simply by removing the hub, since the two have a structure in which they are fitted together so that they can slide in the axial direction. Even if directional movement is possible, manual release is difficult due to large surface pressure resistance between the hub and key in order to remove the hub in the coupled state.

Therefore, there has been a strong desire to develop a reverse action coupling device that can arbitrarily disconnect the output side from the input side and is simple in structure and operation.

Based on the above-mentioned viewpoint, the present invention provides a reverse action coupling device that can extremely easily disconnect the output side and the input side even if there is a failure in the driving power source, In the reverse action coupling device, the hub is equipped with a hub that is mounted on the shaft, and a disk that is fitted to the outer periphery of the hub so as to be able to freely rotate and slide in the axial direction. , and is composed of an inner hub and an outer hub that can freely move in the relative axial direction, and the outer periphery of the inner hub and the inner periphery of the outer hub are mutually meshed so that they can freely rotate together. Further, it is characterized in that it is provided with a meshing portion that is released from meshing due to relative axial displacement of the inner and outer hubs.

Next, the reverse action coupling device of the present invention will be explained by way of embodiments with reference to the drawings.

FIG. 1 shows an example of a reverse action electromagnetic brake in a longitudinal sectional side view as a first embodiment of the reverse action coupling device of the present invention. As shown in the drawing, a field core 6 is fixed with a plurality of bolts 4 and nuts 5, 5 so as to face a fixed platen 3 fixed to a fixed member 1 with a plurality of bolts 2 at a predetermined interval.
has a built-in electromagnetic coil 7.

A plurality of sleeves 9 are provided on the front surface of the field core 6 and are fitted onto the bolts 4 and fixed with nuts 8.
An armature 10 which is guided and movable in the axial direction is shown.

A brake disc 11 is arranged between the armature 10 and the fixed platen 3.

The brake disc 11 is spline-fitted to an outer hub 12, and the outer hub 12 is fitted to an inner hub 15 fixed to a rotating shaft 13 using a key 14 via an oil-impregnated bearing 16 for relative axial movement. On the other hand, a spline hole-shaped engagement part 17 formed at the end is engaged with a spline-shaped engagement part 18 formed at the end of the inner hub 15.

The outer hub 12 and the inner hub 15 are arranged concentrically and rotate together when the fitting parts 17 and 18 engage with each other, but if the engagement parts 17 and 18 are disengaged, both of them rotate separately. Be able to rotate.

On the other hand, armature 10 has field core 6
Brake disk 11 receives the pressing force of compression coil springs 20 inserted into the plurality of recesses 19,
is pressed against the fixed plate 3, and this brake disc 11
brakes the outer hub 12 that is spline-fitted.

The compression coil springs 20 are adapted to adjust the pressing force by adjusting the threading depth of the adjusting bolt 21, and the outer hub 12 has a stopper 23 with its tip inserted into the circumferential groove 22 provided at the end. Insert it and
Under normal conditions, it cannot move in the axial direction, but
If the stopper 23 is removed by removing the bolt 24, it can be moved to the left in the figure.

The stopper 23 is only an example of a member used to prevent the outer hub 12 from moving in the axial direction, and the circumferential groove 22 into which the stopper 23 is inserted is also only an example.

That is, any other structure may be used as long as it is capable of constantly holding the outer hub 12 in the position shown in FIG. 1 and moving it in the axial direction as required.

The operation of the reverse action coupling device of the present invention having the above-mentioned configuration will be explained using the reverse action electromagnetic brake as the first embodiment.
When no voltage is applied to the electromagnetic coil 7,
Both the field core 6 and the armature 10 are de-energized, and the armature 10 presses the brake disc 11 against the fixed platen 3 under the pressure of the compression coil spring 20.

In this state, the outer hub 12, which is spline-fitted to the brake disc 11, is prevented from rotating, and the inner hub 15, which can rotate integrally with the outer hub 12 and the meshing parts 17 and 18, also rotates. is being prevented.

Since the inner hub 15, which is prevented from rotating, is fixed to the rotating shaft 13 via the key 14, the rotating shaft 13 is also prevented from rotating.

That is, this reverse-actuating electromagnetic brake generates a braking force on the rotating shaft 13 in a non-excited state.

Next, when voltage is applied to the electromagnetic coil 7, the armature 10 is excited and the compression coil spring 20
Resisting the elastic pressing force of the brake disc 11, it is magnetically attracted to the field core 6 side and loses its pressing force against the brake disc 11.

As a result, the rotating shaft 13 becomes free.

Now, if there is a power outage etc., armature 10
If it becomes impossible to energize the rotary shaft 13, the rotating shaft 13 continues to be affected by the brake disc 11, which is stopped due to the combined pressing force of the plurality of compression coil springs 20, and cannot be rotated.

In such a case, the outer hub 12 is moved in the axial direction (in this embodiment, to the left in the figure) to release the mesh between the meshing parts 17 and 18.

This allows the inner hub 15 to freely rotate even though the outer hub 12 remains unrotatable, allowing free rotation of the drive system including the rotating shaft 13.

On the other hand, the second embodiment shown in FIG. 2 is an example of a reverse action electromagnetic clutch, and the inner hub 1
5' is fixed to the input shaft 25 via a key 26, and a compression coil spring 20' that presses the armature 10' supports the field core 6' through a bearing 27 so as to be freely rotatable, and also supports the output core 6'. axis 2
8 through a key 29 and inserted into a recess 31 of an output rotor 30. In addition, since the friction plate type is a multi-plate type, the inner disk 32 is spline-fitted to the outer periphery of the outer hub 12', and the outer disks 33 are arranged alternately with the inner disk 32.
is spline-fitted to the inner surface of a drum 34 that is concentrically integrated with the output rotor 30.

On the other hand, a ring 35 made of a non-magnetic material is fixed concentrically to the armature 10' with a plurality of bolts 36, and this ring 35 is attached to the drum 3.
4 is fitted with a spline.

Furthermore, the inner peripheral surface of the open end of the drum 34 is formed with a multi-threaded screw hole 37, into which a ring 38 that acts as a stopper for the outer disk 33 at the end is screwed.

Ring 38 is prevented from loosening by ring 39,
Both rings 38 and 39 are joined together by a plurality of bolts 40.

Further, the outer hub 12' is supported by an outer member by a bearing 41 so as to be freely rotatable, and this outer member may be a sister ring (none of which is shown) or the like that is movable in the axial direction by operating a lever. This allows for free axial movement and normal position maintenance.

The flange portion 30A of the output rotor 30 is provided with an annular non-magnetic portion 42 so that the magnetic flux detours and passes through the armature 10'.

In the case of this second embodiment, since the armature 10' normally presses the outer disk 33 group and the inner disk group 32 against the ring 38 under the pressing force of the compression coil spring 20', the torque of the input shaft 25 is However, the inner disk 32,
Outer disk 33, drum 34, output rotor 3
It is transmitted to the output shaft 28 through a path of 0.

Now, when voltage is applied to the electromagnetic coil 7' built in the field core 6', armature 1
0' is magnetically attracted to the output rotor 30, and the outer disk 33 and the inner disk 32 are in a non-pressure contact state, so the pressure contact state between the inner disk 32 and the outer disk 33 is released, and the torque is transferred from the input side to the output side. The transmission is interrupted.

As in the first embodiment, if the armature 10' remains de-energized due to an accident such as a power outage, the input side and output side will remain coupled.

In this case, even if an attempt is made to repair both the input side and the output side, the input side and the output side cannot be moved because they are connected together, and this phenomenon becomes more pronounced as the load increases.

Therefore, as in the first embodiment, by displacing the outer hub 12' in the axial direction, the meshing portion 17' and the
When the mutual meshing of 8' is released, the inner hub 15' and the outer hub 1, which are in contact with each other via the oil-impregnated bearing 16',
2' becomes free, and the connection between the input side and the output side is released despite the pressure contact between the inner disk 32 and the outer disk 33.

Although both the first and second embodiments show a reverse action electromagnetic connection using electromagnetic force as an external force, there is also a type in which the pressure contact between the inner disk and the outer disk is released by fluid pressure.

It is clear from the above description that the reverse action coupling device of the present invention allows the inner and outer hubs to move freely in the relative axial direction and rotate integrally through the meshing portion even when the driving force source for disengagement disappears. Because we have a structure that
Unlike removing the hub that is keyed to the rotating shaft,
Since the surface pressure resistance of the engaging portion is smaller than the surface pressure resistance of the hub and the key, the connection between the rotary shaft and the disk can be easily manually released, which has an excellent effect of ensuring safety.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional side view showing a first embodiment of the reverse action coupling device of the present invention, and FIG. 2 is a longitudinal sectional side view showing the second embodiment. In the drawings, 1... Fixed member, 3... Fixed plate, 6, 6'...
Field core, 7, 7'... Electromagnetic coil, 9...
...sleeve, 10,10'...armature, 1
1... Brake disk, 12, 12'... Outer hub, 13... Rotating shaft, 14... Key, 15, 1
5'...Inner hub, 16,16'...Oil-impregnated bearing, 1
7, 17', 18, 18'... meshing portion, 19... recess, 20, 20'... compression coil spring, 21...
Adjustment bolt, 23... Stopper, 24... Bolt, 25... Input shaft, 26... Key, 27... Bearing, 28... Output shaft, 29... Key, 30
...Output rotor, 30A...Flange part, 31...
... recess, 32 ... inner disk, 33 ... outer disk, 34 ... drum, 35 ... ring,
36... Bolt, 37... Screw hole, 38, 39...
...Ring, 40...Bolt, 41...Bearing, 42...Non-magnetic part.

Claims (1)

[Claims] 1. A reverse action coupling device comprising a hub mounted on a rotating shaft so as to be able to rotate integrally therewith, and a disk fitted to the outer periphery of the hub so as to be able to freely rotate integrally and slide in the axial direction. The hub consists of an inner hub and an outer hub that are separated from each other and are movable relative to each other in the axial direction. What is claimed is: 1. A reverse action coupling device, characterized in that it is provided with a meshing portion that freely meshes with each other and that is released from the mesh by relative axial displacement of the inner and outer hubs.