JPH02147598A - Emergent brake device - Google Patents

Abstract

PURPOSE:To obtain an emergent brake device with a large emergent brake torque by installing a pressing operating part and a brake part in separation. CONSTITUTION:When the first gear shaft 21 revolves in the C-direction and an allowable revolution speed is exceeded, the free edge side of a centrifugal piece 33 springs outwardly and turns around a supporting pin 34, against the springy force of a pulling spring 36, and the outer peripheral arcuate surface is press-attached onto the inner circumferential surface of the cylinder part 46b of a movable body 46. Therefore, the movable body 46 is turned in the C-direction, and an aslant surface part 46a is attached onto the aslant surface pat 45a of a fixed plate 45 and shifts in the getting- over D-direction, and is attached onto the frictional plate of a turning urging body 30 and applied with a turning moment in the C-direction, and kept in the self retention state at a turning position in the same direction. A movement receiving plate 47 is shifted in the same direction by the pressing shift in the D-direction of the movable body 46, and a pressing body 49 is shifted in the same direction through a belleville spring 50. Therefore, a pressure plate 58 presses a brake plate 56 and a pressing plate 59 through a receiving metal 60, and a brake torque is generated, and the turn of the rotary body is brake-appllied through a brake gear 53 and the first gear 21, and stopped.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention applies pressure in the axial direction by the operation of the centrifugal piece when the rotating body exceeds the Kineya rotational axis, and at t, the brake section performs a braking action. related to emergency braking equipment.

[Conventional technology]

FIG. 9 is a sectional view of a hoist using a conventional emergency brake device, as shown in, for example, Japanese Utility Model Application Publication No. 60-403969. In the figure, 1 is the main brake device, 2 is the drive electric motor with this main brake device attached to the outer end, and 3 is the speed reduction device that controls the rotation of this 'fM, ilh machine! 16 is a rope drum rotated, 4 is a connecting shaft connected to the rotating shaft of the electric motor 2, 5 is a main body frame surrounding the rope drum 3, 7 is an emergency brake device, and 8 is a connecting shaft connected to the connecting shaft number. In Q (the above-mentioned wheel hoist), which is a braked shaft, the rotation of the rotary shaft of the electric motor 2 is decelerated by the speed reduction device via the connecting shaft 4, and the rope drum is rotated. When the electric motor 20 is de-energized, the main brake device 1 stops the rotating part.

The emergency brake system is shown in Figure 1 and Figure 0 is a vertical cross-sectional view.
This is shown in an explanatory diagram of 11mK operation. 9 is bearing, 10 is gray:
A disc spring for receiving the Jr. plate 1, 12 a brake wheel that is spline-coupled to the shaft 8 to be axially movable and rotated, 13 a brake case, and 14 fixed to the end of the shaft 8 to be braked so that it can rotate. A centrifugal piece support, 15 is a plurality of centrifugal pieces received in a recess on the outer periphery of the centrifugal piece support, 16 is hung on a plurality of support pins passing through the center of each centrifugal piece 15, and the centrifugal pieces 15 are centrifuged. A pair of rings on both sides press against the recess on the outer periphery of support member No. 1, and 17 is a brake shoe of an emergency brake actuating part that is movable in the axial direction, and a plurality of inclined surfaces 17A are formed in the circumferential direction. ing.

18 is a brake cover attached to the brake case 13 with bolts 20, and has a plurality of inclined surfaces 18A in the circumferential direction.
is formed and faces the inclined surface 1'7A. 19
is a return spring that returns the brake shoe 17 to the direction in which the brake shoe 17 is released.

The above hoist usually consists of electric machine 2 and main brake device ll.
During such cargo handling work, the main brake is applied to stop the rotation and braking of the girobe tram 3, and to hoist, lower, and stop the load. If the tl fails and brakes are no longer possible, the load will fall by driving the hoist backwards.

As the load begins to fall in this way, the rotational speed of the rotating shaft of the electric motor 2 rises and reaches the set critical rotational speed.
As shown in FIG. 11, the centrifugal piece 15 is elastically deformed against the spring pressure of the ring spring 19, moves outward, and comes into pressure contact with the inner circumferential surface of the brake shoe 17. As a result, the brake shoe 17 is dragged by the centrifugal piece 15 and rotates in the same direction.
The inclined surface l is in contact with the opposing inclined surface 18A, the pressing is moved in the axial direction wJ (direction D), and the brake wheel 12 is clamped and pressed against the brake plate 11. Also, the brake shoe 17 is connected to the J of the collar and the brake wheel 12.
The brake wheel 12 is dragged by the friction force 41 and maintained at a predetermined rotational position, and the brake wheel 12 is further pressed between the brake plate 11 and the brake shaft 8 to stop rotating.

[Problem to be solved by the invention]

In the conventional emergency brake device as described above, the centrifugal piece 15
The brake shoe 17, which presses in the p-axis direction by the operation of L[ffl, presses the brake wheel 12 and generates braking torque with the brake plate 11. The outer diameter of the brake wheel 12 and the braking torque are restricted by the outer diameter of the brake shoe 17.

Therefore, when a large emergency braking torque is required, a brake shoe with a large outer diameter is required, the centrifugal piece 15 and the centrifugal piece support 14 are also large, and the shaft diameter of the braked shaft 8 is made large for strength reasons. This often resulted in the problem that the entire emergency braking device became large.

This invention was made in order to solve such problems, and an object of the present invention is to provide an emergency brake device that can obtain a large emergency braking torque without increasing the size of the centrifugal piece and the centrifugal support body. It is said that

[Means to solve the problem]

In the emergency brake device according to the present invention, the pressing that is converted into axial pressing by the action of the centrifugal piece due to overspeed of the rotor is an actuating part, and this pressing is by the actuating part, and the pressure plate is a brake plate. It is separated from the brake part that performs braking.

[Effect]

In this invention, the pressing is performed by separating the actuating part and the brake part, and the outer circumferential dimensions of the pressure plate and the brake plate, which generate the braking torque of the brake part, are not restricted by the actuating part. , can be made larger as necessary, and the pressing operation part does not need to be made larger.

〔Example〕

FIG. 1 is a sectional view of a hoist using an emergency brake device according to an embodiment of the present invention. In the figure, 1 is a main brake device attached to the outer end of the drive motor 2, and when the electric motor 2 is de-energized, the rotating part is braked to a stop. 3 is a rope drum rotated by the rotation of the electric motor 2 via the υ reduction device 20; numeral 3 is a connecting shaft connected to the rotating shaft of the electric motor 2, which connects the first gear shaft 21, which is a shaft to be braked. . 5
26 is an emergency brake device attached to the outer end of the speed reduction device 20.

The emergency brake device 26 is shown in an enlarged sectional view in FIG.

22 is a gear box attached to the main body frame 5, 23 is an emergency brake part bracket attached to this gear box,
An oil seal 25 is attached to support the first gear shaft 21 via a bearing 24. Emergency brake device 26
The pressing unit consists of an actuating part 27 and a brake part 28.

The pressing operation section 27 is configured as follows. 29
is attached to the bracket 23, and the nine presses are the actuating part case,
Reference numeral 30 denotes a rotational biasing body which is spline-coupled to the first TA axle 21 and rotated, and is movable in the axial direction, and has friction plates fixed to both sides.

Reference numeral 31 denotes a centrifugal piece support that is spline-coupled to the @l gear shaft 21 and rotated, and is fixed in the axial direction by a pair of retaining rings 32. A pair of centrifugal pieces 33 are rotatably supported by a pair of support pins 34 fixed to the centrifugal piece support 31, respectively.

The centrifugal piece 33 is shown in FIGS. 3 and 3 when viewed from the entrance direction.
It is as shown in FIG. 4, which is a cross-sectional view at tv@. A bolt 35 is fixed to the free end side of both centrifugal pieces 33, and a tension υ spring 3 is installed between each centrifugal piece 33 and the support pin 34 on the other side.
Multiplied by 6, normal [i! When the transmission speed is l, the centrifugal piece 33
Close the free end side of #j to a position in contact with the first gear shaft 21
J is showing off. A pair of washers 37 are fitted onto the support pin 34, receive the tension spring 36, and are fixed with a retaining ring 38. A pair of washers 39 and a spacer tube 40 are attached to the bolt 35.
is fitted and receives a tension spring 36.

In FIG. 2, the return pressing is performed in the actuating part 27, 41 is a pair of guide pins fixed to the case 29, 42 is a spacer attached to the case 29 with a bolt 44 together with a cover 43, and one end of the guide pin 41 is shown in FIG. is fixed. Reference numeral 45 denotes a fixed plate with a slope, which is fitted into the case 29, supported by the guide pin 41, and received by a spacer, and has two corrugated slope parts arranged at equal intervals in the circumferential direction on the inner side. In Fig. 3, the fixed plate 45 with a slope is shown by a chain line, and the view seen in the B direction is shown in Fig. 5.
As shown in the figure. A pair of wavy slope portions 45a protruding in the axial direction are provided on the inner surface of the fixed plate 45.

The pressing in FIG. 2 returns to the actuating part 2), and 46 is a movable body with a slope movably supported in the case 29, through which the guide bottle 41 is passed, and the cylindrical part 46b is extended, The circumferential surface corresponds to the outer circumferential surface of the centrifugal piece 33.

As shown in FIG. 3, the movable body 46 is provided with elongated holes 46c through which the respective guide bins 41 pass, so that the movable body 46 can rotate within a predetermined range in the circumferential direction.

In addition, the movable body 46 includes each corrugated slope portion 45a of the fixed plate 45.
A pair of wavy slope portions 46a corresponding to the wavy slope portions 46a are provided.

As shown in FIG. 5, when the movable body 46 is rotated in the direction of arrow C, the slope portion 46a rides on the slope portion 454 on the fixed side in the direction of the arrow C axis), and the braking is applied. Pushing produces force.

The pressing shown in FIG.
The oTvJ body 46 body axis 6 is movable in the axial direction and received in the circumferential direction by the interlocking receiving plate fitted in the guide pin 41.
When the waveform spring washer 48 is moved in the CD direction, the waveform spring washer 48 is compressed via the rotation urging body 3o, and is moved in the same direction. 49 is fitted into the case 29, and the pressure received by each guide bin 41 in the axial direction at 0 TvJ and the circumferential direction is the body, and the brake pressure of the interlocking receiving plate 4 is moved in the direction (D direction). Otherwise, the plates are moved in the same direction via the springs 50. A pressing body 49 has a pressing portion 49a extending in the axial direction, and a retaining ring 52.
is fitted, and the retraction and return position is regulated by a wave-shaped spring washer 51.

The play center 28 is configured as follows.

53 is a brake IIIK coupled to the involute serration 21a provided on the first m-th axle 21;
It is fixed in the axial direction by a pair of retaining rings 55 via a washer 54. A pair of brake plates 56 are connected to the teeth of the brake gear 53 by teeth provided on the inner periphery, and brake linings are fixed to both surfaces of the brake plates. 57 is a receiving pin fixed to the bracket 23 and the case 29;
8.59 is a pressure plate that is fitted in the receiving pin 57 and is movably supported in the axial direction, and receives braking pressure and presses each brake plate 5.
6 is divided into two parts. Reference numeral 60 denotes a receiving plate which is fixed to the pressure plate 58 with bolts 61, and the pressing part 49a is pressed by the body 49.
It is in contact with the respiratory surface of the body.

The operation of the emergency brake system according to the above embodiment is as follows. When the first gear shaft 21 rotates in the C direction shown in FIG.
4, the free end side protrudes outward and regenerates, and the outer circumferential arcuate surface presses against the inner circumferential surface of the cylindrical portion 46b of the movable body 46.

As a result, the movable body 46 is rotated in the C direction, and the slope portion 46
a contacts the slope portion 45a of the fixed plate 45 and moves eastward in the D direction, contacts the friction plate of the rotating @J motion biasing body 30, receives a helping force in the C direction, and moves to a rotating position in the same direction. This pressing of the movable body 46 in the D direction is movement, and the interlocking receiving plate 47
are moved in the same direction, and the pressing force via the disc spring 50 moves the body 49 in the same direction. Accordingly, the pressure plate 5 is connected to the brake plate 56 through the support plate 60. The pressure plate 59 is pressed, a braking torque is generated, and the flake gear 53. @lThe rotation of the rotating body is stopped via the gear shaft 21.

A centrifugal piece according to another embodiment of the invention is shown in FIG. 6, which is a front view corresponding to FIG. 3. The centrifugal piece 63 has one end supported by the support pin 34, the other end rotatably opened, and the other end normally closed and rotated inward by the tension spring 36. ing. The circular arc surface of the outer circumference of the centrifugal piece 63 is provided with a notch 63a near the support point G at one end.

FIGS. 7 and 8 are explanatory diagrams showing the actions of the centrifugal piece 33 of FIG. 3 and the centrifugal piece 63 of FIG. 6.

In FIG. 7, when the centrifugal piece 33 flies out and rotates due to the centrifugal force due to overspeed, the outer circumferential arcuate surface of the centrifugal piece 33 comes into pressure contact with the inner circumferential surface of the cylindrical portion 46a of the movable body 46 with an inclined surface, causing the centrifugal piece 33 to rotate.

The M operation point (2) at which the centrifugal piece 33 acts on the circle fRJffls46a is the center point in the circumferential direction of the arc surface O.The apparent pressing force P of the movable body 46 is as follows.
PL2 = FL2 + μPLI Therefore,
P = FL2/(Ll-μLl) where, F: Centrifugal force of the centrifugal piece, μ: Friction force, Ll: Distance in the horizontal force direction from the support point to the friction point, Ll: From the support point to the friction point distance in the direction of the vertical component of the force.

In order to increase P, assuming that F and μ are constant, LH can be increased.

In the centrifugal piece 63 shown in FIG. 8 according to the other embodiment described above, the notch 63a is provided in the vicinity of the support point G on the circular arc surface of the outer periphery, so that the friction point H is moved to the other end side. Therefore, the size L1 of the centrifugal piece 33 in FIG. 7 becomes larger, and a larger pressing force P can be obtained. Further, with the same pressing force P, the size can be made smaller.

In the above embodiment, the emergency brake device is applied to a hoist, but the present invention is not limited to this, and can be applied to rotating bodies of other types of machines.

〔Effect of the invention〕

As described above, according to the present invention, the pressing part that presses the centrifugal piece toward the brake part side due to the protruding rotation is activated by the actuating part;
This pressing is applied by the actuating part, and the pressure plate presses the brake plate and is separated from the brake part, which performs braking, so the pressing does not have the effect of enlarging the actuating part, and the brake part can be made larger as necessary. Large capacity emergency braking torque can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view of a hoist using an emergency brake device according to an embodiment of the present invention, FIG. 2 is a vertical cross-sectional view of the emergency brake device portion of FIG. 1, and FIG. 3 is a centrifugal piece of FIG. and a view of the movable body part with a slope in the A7j direction, Figure 4 is IV of Figure 3.
5 is a cross-sectional view taken along the line -IV, FIG. 5 is a view of the fixed plate with an inclined surface and the movable body with an inclined surface shown in FIG. 3 is a front view, FIGS. 7 and 8 are explanatory diagrams showing the action of the centrifugal force of the centrifugal piece in FIGS. 3 and 6, and FIG. 9 is a diagram of a hoist using a conventional emergency brake device. The longitudinal sectional view, FIG. 10, and the top view are a longitudinal sectional view and an operation explanatory diagram of the emergency brake device of FIG. 9. 26...Emergency brake device, 27...Pushing is done by vJ
Part, 28... Brake part, 31... Centrifugal support, 3
3... Centrifugal piece, 34... Support pin, 45... Fixed plate with slope, 45a... Waveform slope part, 46... Movable body with slope, 46a... Waveform slope part, 46b. ... Cylindrical part, 49... Pressing body, 56... Brake plate, 58.
59...Pressure plate. In addition,

Claims (2)

[Claims] (1) Due to the overspeed of the rotating body, the centrifugal piece pops out and rotates around the support end, and the outer circular arc surface of the centrifugal piece presses against the inner circumferential surface of the cylindrical part of the movable body with an inclined surface and rotates in the rotation direction. The press operating part converts the pressure into axial pressure by applying pressure in the axial direction, and the brake part receives the pressure and presses the pressure plate against the brake plate to brake the brake plate. An emergency braking device characterized by having separate parts. (2) The emergency brake device according to claim 1, wherein the outer circumferential arcuate surface of the centrifugal piece is provided with a notch near the support end.