JPH0396749A - Self-lock mechanism - Google Patents

Abstract

PURPOSE:To efficiently accelerate manual operation by spirally fitting a manual handle shaft to one end of a movable coupling and a manual shaft to the other end by mutually reversed screws, and freely engaging first and second clutches for preventing rotation in reversed directions with an axial moving space. CONSTITUTION:A sluice lifting rack 11 is driven by a power shaft 4 or a manual shaft 12. The manual shaft 12 is connected to a manual handle shaft 14 and a manual handle 15 through clutches 20, 21 and a self-lock mechanism 13. A flange 22 has laterally reversed male screws 22a, 22b and ratchet gears 23, 24 prevented by claws 25, 28. When the manual handle 15 is rotated in one direction, a female screw 14a and the male screw 22b are mutually pulled, and the ratchet gear 23 is compressed from both sides and rotated. For the other ratchet gear 24, the reversed screws 22a, 22b are repelled to form spaces on both sides of the gear by a gap g to provide a rotation in free state. When the rotation of the handle 15 is stopped, the claw 25 bites the ratchet 23. Hence, manual operation can be efficiently and rapidly conducted without using a worm speed reducer.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention relates to a drive device, such as a water gate opening/closing device, having an electric motor and a manual handle for emergency operation, when one of the drives is in operation. This invention relates to a self-locking mechanism that automatically locks power transmission.

[Conventional technology]

In an electric water gate opening/closing device, the output shaft of an electric motor is connected to a screw through a worm wheel so as to mesh with a spindle rod, and the rotational output of the electric motor is used to raise and lower the water gate. In addition, a manual operation mechanism is provided in case of a power outage. Although the structure in this case is relatively simple, it has the drawback that the intermittent operation of the manual operating mechanism is extremely complicated and time consuming, and cannot be used in emergency situations.

As a solution to these shortcomings, the
There is a water gate opening/closing device described in Publication No. 3608.

As shown in FIG.
Two side gears 103. 104 and gear l09 respectively
. 111 is engaged with a gear 126 fixed to a clutch shaft 125,
The side gears 103, 1 of the differential gear mechanism 102
A shaft 105 rotatably supporting each of the clutch shafts 123 is connected to a water gate lifting rack 123 via a deceleration mechanism, and a brake device 128 is connected to one end of the clutch shaft 125.
A manual handle 13B is connected to the clutch shaft 125 via a clutch device 131 and a gear mechanism (specifically, a worm gear mechanism) having a self-locking function, and further,
This is a water gate opening/closing device in which the clutch shaft 125 and a gear mechanism having a self-locking function can be freely engaged and disengaged by operating the clutch device 131.

[Problem to be solved by the invention]

In this way, in this conventional water gate opening/closing device, as a mechanism to stop rotation from the electric motor side during manual operation,
It uses a self-locking mechanism using a worm gear mechanism. However, this worm gear mechanism is particularly inefficient, so when manually opening and closing a water gate, it is necessary to turn the handle many times to raise the required lift.

Therefore, there is a drawback that opening and closing operations using a manual handle cannot be performed in an emergency.

Therefore, an object of the present invention is to eliminate the inefficient worm speed reducer of the manual shaft, and to enable the water gate to rise more efficiently and faster even when the manual shaft is used than when a worm is incorporated.

[Means to solve the problem]

In order to achieve this purpose, the self-locking mechanism of the present invention has a manual shaft and a power shaft attached to the input shafts of a gear device having two input shafts and one output shaft, respectively, and a right-hand female threaded portion on the manual handle shaft. A left-hand female thread provided on the manual shaft is attached to the left-hand male thread of the movable coupling, which has a right-hand male thread at one end and a left-hand male thread at the other end to be screwed into the right-hand female thread. a first and a second one-way clutch, which are screwed together to prevent leftward rotation and rightward rotation between the manual handle shaft and the movable coupling and between the movable coupling and the manual shaft, respectively; The brake discs are rotatably engaged with each other with a predetermined movement gap in the axial direction.

In addition, in this mechanism, the directions of the screw and the one-way clutch may be reversed.

〔Example〕

Hereinafter, the present invention will be specifically explained based on Examples.

FIG. 1 is a schematic diagram showing an embodiment of the present invention, FIG. 2 and FIG.
The figures are a view in the direction of the A arrow and a view in the direction of the B arrow in FIG. 1, respectively. In the figure, 1 is an electric motor, 2 is a worm gear, 3 is a worm wheel, 4 is a power shaft, 5 is a pinion attached to the power shaft, 6 is an internal and external gear, 7 is a planetary gear, 8 is a sun gear, and 9 is a planetary gear 0 is a binion, 1l is a rack for lifting the water gate, 12 is a manual shaft attached to the sun gear 8, 13 is a self-locking mechanism, 14 is a manual handle shaft, and 15 is a manual handle.

Further, 16 is a bevel gear attached to the manual shaft 12, 18 is a brake shaft that transmits rotation to the centrifugal brake 19 when its own weight is lowered, 19 is a centrifugal brake that lowers the water gate at an almost constant rotation speed, and l7 is rotated by the brake shaft 18. bevel gears 20 and 21 that transmit the self-locking mechanism l3
22 is a flange with male screws 22a and 22b having opposite twisting directions at both ends, 23 and 24 are ratchet gears, and 25 is a pawl that prevents the ratchet gear 23 from rotating in the left direction. pin 26
installed by.

Further, 28 is a pawl that prevents the ratchet gear 24 from rotating in the right direction, and is attached to the main body case 27 with a pin 29. g is the ratchet gear 2 when the male threaded flange 22 and the manual handle shaft l4 move in the axial direction.
3. This is the gap during assembly that creates a gap on both sides of 24.

Note that the same mechanism as the self-lock mechanism 13 can be used for the worm gear 2 and the worm wheel 3, which reduce the rotation of the electric motor 1 and have a self-lock function.

The operation of the present invention will be explained below.

(1) Manual winding (a) Rotate the manual handle 15 clockwise.

(b) The manual handle shaft l4 rotates in the same clockwise direction as the manual handle 15.

(C) Attach one end of the manual handle shaft l4 to the right female thread 1.
4a.

(d) Threaded flange 22 on rightward female thread 14a
The rightward male threads 22b at one end of the two pull together, and the ratchet gear 23 is compressed from both sides.

(e) The ratchet gear 23 compressed from both sides rotates in the winding direction shown in FIG.

(f) One end of the clutch 21 has a leftward female thread 21a.

(g) Threaded flange 2 on left female thread 21H
The leftward male screws 22a at one end of the ratchet gear 24 repel each other, and gaps are generated on both sides of the ratchet gear 24.

(Company) The ratchet gear 24 with gaps on both sides is the third one.
Rotate in the winding direction shown in the figure.

(i) Since the pawl 28 remains engaged with the ratchet gear 24 and a gap is generated on both sides, it rotates freely.

('') When the hand is released from the manual handle 15, the pawl 25 engages the ratchet gear 23, and the manual shaft 12 stops.

(2) Manual lowering (a) Rotate the manual handle l5 counterclockwise.

(w) Manual handle shaft l4 rotates counterclockwise in the same direction as manual handle l5.

(C) Connect one end of the manual handle shaft l4 to the rightward female thread l.
4a.

(d) Threaded flange 2 on right-hand female thread 14a
The rightward male screw 22b at one end of the ratchet gear 23 rebounds, and gaps are generated on both sides of the ratchet gear 23.

(e) The ratchet gear 23 with gaps on both sides rotates in the lowering direction of FIG.

(f) The pawl 25 remains engaged with the ratchet gear 23 and rotates freely since there are gaps on both sides.

(g) The leftward female thread 21a attracts the leftward male thread 22a at one end of the threaded flange 22, and the ratchet gear 24 is compressed from both sides.

(5) The ratchet gear 24 compressed from both sides is the third
Rotate in the lowering direction shown in the figure.

(i) The pawl 28 does not engage with the ratchet gear 24 and rotates freely with both sides compressed.

(3) Electric winding (a) Rotation of the electric motor 1 transmits torque to the worm gear 2 → worm wheel 3 → force shaft 4 → pinion 5 → internal and external gears 6 of the planetary gear, and rotates them.

(b) The rotational force transmitted to the internal and external gears 6 is transmitted to the planetary gears 7
can be conveyed to.

(C) The rotational force transmitted to the planetary gear 7 is transmitted to the planetary gear shaft 9-1 and the sun gear 8.

(d) The rotational force transmitted to the sun gear 8 is transferred to the manual shaft 12.
When the direction of rotation is the winding direction, it is counterclockwise when viewed from the axial direction.

(e) In the case of counterclockwise rotation, the leftward female thread 21a at one end of the clutch 21 attracts the male threaded flange 22, and the ratchet gear 24 is compressed from both sides.

(f) The ratchet gear 24 compressed from both sides tries to rotate in the winding direction shown in FIG. 3, but the rotational force is stopped by the claws 28.

(9 The rotational force is stopped by the pawl 28, so the manual shaft 12
The rotational force is not transmitted in the direction of the planetary gear shaft 9a, but is transmitted only in the direction of the planetary gear shaft 9a, transmitting the rotational force to the pinion 10, and the rotational force is transmitted to the rack rod II.
roll up.

(4) Electric lowering (a) to (C) are the same as in the case of electric winding.

(a) The rotational force transmitted to the sun gear 8 rotates clockwise when viewed from the axial direction when the rotation direction of the manual shaft 12 is in the lowering direction.

(e) In the case of clockwise rotation, the rightward female thread 14a at one end of the manual handle shaft 14 engages the male threaded flange 22, and the ratchet gear 23 is compressed from both sides.

(f) The ratchet gear 23 compressed from both sides tries to rotate in the lowering direction of FIG. 2, but the rotational force is stopped by the pawl 25.

[Difficult] Since the rotational force is stopped by the pawl 25, the manual shaft l
2, but only in the direction of the planetary gear shaft 9a, transmitting the rotational force to the pinion lO and the rack rod l1.
Roll down.

(2) As soon as the bottom of the water gate body suspended on the rack rod 11 touches the bottom, a rotational force is generated on the rack rod l1 by the pinion 10.

(】) A lowering rotational force is generated, and the planetary gear receiver 9 comes to a rotational stop state.

('') Due to the rotation stop state, the planetary gear 7
rotates.

(g) When the planetary gear 7 rotates, the sun gear 8 starts rotating counterclockwise in the opposite direction.

(1) When the rotation direction is reversed, the ratchet gear 23 rotates in the winding direction shown in FIG.

(e) In the case of counterclockwise rotation, the leftward female thread 21a at one end of the clutch 21 engages with the male threaded seven langes 22, and the ratchet gear 24 is compressed from both sides.

(n) Ratchet 7 compressed from both sides} The gear 24 tries to rotate in the winding direction shown in FIG. 3, but the rotational force is stopped by the pawl 28.

(○) Since the rotational force is stopped by the pawl 28, the manual shaft l
2, but only in the direction of the planetary gear shaft 9a, transmitting the rotational force to the pinion IO, and the rack rod 1
Press down on 1.

In the above embodiment, the winding direction of the manual handle is clockwise rotation, and the left and right directions of the screw and the rotation blocking direction of the ratchet gear are set. However, when the winding direction of the manual handle is counterclockwise rotation, The relationship between left and right can be reversed.

〔Effect of the invention〕

As explained above, according to the self-locking mechanism of the present invention, since there is no worm reducer between the manual shaft and the output shaft, efficiency is improved and loads such as water gates can be driven quickly. .

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing an embodiment of the present invention, FIG. 2 and FIG.
The figures are a view in the direction of the A arrow and a view in the direction of the B arrow in FIG. 1, respectively, and FIG. 4 is a sectional view showing an example of a conventional mechanism. I: Electric tlJ machine 3: Worm wheel 5: Pinion 7: a star gear 9: a star gear receiver IO: pinion I2: manual shaft I4: manual handle shaft I5: manual handle 18: brake shaft 20, 21: clutch 22: Flange with male thread 22b: Right male thread 25.28: Claw 2T: Main body case 2: Worm gear 4: Power shaft 6: Internal and external gears 8: Sun gear 9a: Planetary gear shaft 11: Water rar elevating rack 13: Self-locking Mechanism l4a: Right female thread 16, 17: Bevel gear l9: Centrifugal brake 21a: Left female thread 22a: Left male thread 23. 24: Ratchet gear 26. 29: Bin g: Gap during assembly

Claims (1)

[Claims] 1. A manual shaft and a power shaft are respectively attached to the input shafts of a gear device having two input shafts and one output shaft, a right female threaded portion is provided on the manual handle shaft, and the right female threaded portion is provided with a right female threaded portion. A left female thread provided on the manual shaft is screwed into the left male thread of the movable coupling, which has a right male thread at one end and a left male thread at the other end. First and second brake discs, which form one-way clutches that prevent left and right rotations between the handle shaft and the movable coupling and between the movable coupling and the manual shaft, respectively, are moved in a predetermined direction in the axial direction. A self-locking mechanism characterized by being rotatably engaged with a movement gap. 2. The self-locking mechanism according to claim 1, wherein the left and right relationships between the screw and the one-way clutch are reversed.