JPS58217276A - Lock mechanism of output shaft - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] This release! -1 relates to an output shaft rotation mechanism that can lock the rotation of an output shaft driven by a motor when the motor is off.

For example, in order to provide an electric driver that rotates the driver with the output of a forward/reverse motor so that it can be used as a manual 1klJ type driver, it is sufficient to configure the electric driver's output shaft to be fully locked. The output shaft must be locked each time the system is operated, and the lock must be completely removed each time the system is operated electrically, which makes the work extremely cumbersome and prevents smooth work.

Furthermore, in the case of an electric valve that uses the output of a forward/reverse motor to open and close the spider-shaped valve that controls fluid, the output shaft is free when the motor is OFF, so an electromagnetic brake is used to brake the output shaft. must be used together, which inevitably results in an expensive configuration.

Furthermore, in the case of an electric hoist, an electromagnetic brake must also be used to brake the wire winding drum, which inevitably results in an expensive configuration.

Therefore, the present invention provides a locking mechanism for the output shaft that automatically locks the output shaft by turning the motor '1' OFF, without requiring a lock operation part or an electromagnetic brake, as in the above-mentioned example. purpose.

According to this invention, a planetary gear reducer (an internal gear of 8".f) is held rotatably within a predetermined range, and a ratchet gear is connected to the output shaft at a position opposite to this internal gear. A pair of ratchet pawls that mesh with this ratchet gear from the forward and reverse directions are forced into engagement, and each ratchet pawl is completely released from its engagement in response to the forward and reverse rotation of the motor output. internal μ
Since the internal gear is provided with a release member that is operated within the rotation range of the gear, the following effects can be obtained.

In other words, due to the interposition of the planetary gear, the aforementioned internal gear rotates in the opposite direction to the output direction of the motor due to the rotation of the planetary gear when driven from the motor side, and when rotated from the output shaft side. are in the same direction of rotation due to the revolution of the planetary gears.

For that purpose, the motor 1ONl and the output fiQj are set to jJ!
(When applying force, -a5"f'J of load at the beginning of 1st drive σ mountain
The internal gear rotates in the direction opposite to the morph output direction until the position wind flilJ is reached, and this time i1'
At ij, the release part Ji (provided on the internal gear) releases the grip of the ratchet pawl on the side corresponding to the forward and reverse rotation of the motor, so the ratchet gear becomes free, and then,
When the position of the internal gear is regulated and rotation is stopped, the transmission function of the planetary gear is activated, and the output of the motor is transmitted to the output shaft and driven.

On the other hand, when the motor ff: O'FF is set to F and the output shaft rotates fully, the load is applied from the output shaft side, so the output shaft revolves the planetary gear and rotates the internal gear in the same direction. By this rotation, the release member facing in the rotational direction is moved to a position 11:L where it has no effect on the ratchet pawl, and the ratchet pawl is engaged with the ratchet gear, thereby locking the rotation of the output shaft.

Moreover, since the pair of ratchet pawls in the forward and reverse directions act equally, it is possible to lock the output shaft in both the forward and reverse directions.

According to this origin jK, the lock is automatically released when the motor side rotates, so the motor is turned on.
Output is automatically obtained on the V41 force shaft, and the motor is
By using FF, when a load is applied to the output shaft, it is automatically locked in the direction of the load, eliminating the need for any special locking operation.

As a result, if this invention is applied to an electric screwdriver,
Just by turning the motor yOFF, the output shaft is locked and becomes a manual driver.Therefore, there is no need to fully lock the torque limiter, and there is no need for a locking structure. Manual type and EUT type can be easily obtained, improving work efficiency, and if used for military UIJ type valves and electric hoists, there is no need to install an electromagnetic brake, and the configuration is compact. Moreover, it can be constructed at low cost.

An embodiment of the present invention having such characteristics will be described in detail below with reference to the drawings.

Figures 1 to 5 show the locking position of the output shaft (F'J is '1:1).
In the first [:, <i, the electric screwdriver l has a chuck 2 at the tip,
This chuck 2 holds various drivers (not shown).

The casing 3 is formed into a cylindrical shape, and the tip thereof is equipped with an operation f:;I 4 for setting the load of the torque limiter. Negative k'if, 'f'fk is determined.

A grip part 5 is arranged in the middle lower part of the casing 3, and six triggers are provided at the front of the base of the grip part 5, and the triggers 6 are used to turn the main source OFF and ON.

A power switch 7't (II'U) is provided on the side surface of the inside part 1+'J of the casing 3 described above to switch the forward/reverse motor between forward and reverse directions and to stop it (power OFF). , motor is forward rotation ON/stop 0FI
i'・Reverse ON is changed 9). Note that since the switch 7 is internally configured in a ring shape, the switch 7 is also provided on the opposite side of the casing 3 .

The electric screwdriver 1 uses a battery as a power source, and the box is provided so as to be housed in the rear end of the casing 3 as appropriate.

In FIG. 2, the output of the forward/reverse motor 8 fixed in the casing 3 is controlled by a planetary gear reduction mechanism 9 provided in three stages,
10. Power is transmitted to the output shaft 12 after being decelerated by 11
be done. The output gear 14 fixed to the motor shaft 13 meshes with the planetary gear 15 on the side 9 of the first stage reduction mechanism, and the output gear 17 of the carrier 16 supported by this gear 15 (i7) is connected to the output gear 17 of the second stage reduction mechanism 10. The output gear 20 of the carrier 19 that meshes with the planetary gear 18 and supports this gear 18 meshes with the planetary gear 21 of the third stage reduction a side 11, and the carrier 22 that supports this gear 21'i outputs the above-mentioned output. axis 1
As a result, the output of the motor 8 is transmitted to the output shaft 12.

The internal gear 23 of the reduction mechanisms 9, 100 and 23 is provided in common, and is fitted into the gear case 30 so as to be able to slip (turn 1fiII).

An uneven chrysanthemum 3r 24 is formed around the side surface 1 of the internal gear 23 facing the motor 8 mentioned above, and this chrysanthemum 24 [I? The ball 26 is brought into contact with the ball 26, and the ball 26 is biased toward the field/seat 24 side by the spring 28 via the receiving plate 27, and the ball clutch 29 is formed at 11"f'.

The above-mentioned ball clutch 29 can set a torque limiter by adjusting the biasing force of the spring 28. jjj is performed by the adjustment (2) which moves the internal gear 23 toward the port/l/26 side, and this operation is operated by the aforementioned operating cylinder 4.

That is, the operation tube 4 is held in the casing 3 so as to be able to rotate only, and a sliding tube 31 is provided oppositely to the inside of the operating tube 4.
0, and the operating barrel 4 and the screw 32e engage with each other, and the forward and reverse rotation of the operating barrel 4 is exchanged for sliding in the front-rear direction.

An interlocking rod 33 slidably held by the gear case 3o is in contact with the inner end of the sliding tube 81, and the other end of the interlocking rod 33 is in contact with the aforementioned internal gear 23. . For this purpose, when the operation tube 4 is rotated, the sliding +yh 31
, the internal gear 7-28f is moved via the interlocking rod 33, and this movement adjusts the biasing force of the pole clutch 29 and sets the torque limiter.

As shown in Figures 3 and 4, as mentioned above! 7) A locking mechanism R for the output shaft 12 is configured in the internal gear 34 portion of the speed reduction mechanism 11 constituting the third stage. That is, a protrusion 35 is continuously provided on the outer peripheral surface of the gear 34.
2 Holding gear case, C3OK1.21 part 36'ff
: Formed and fitted with the above-mentioned protrusion 35, and this recess 3
The internal gear 34 allows the roundworm rJ to be accommodated within a predetermined range where the protrusion 35 is regulated by the arrow 6.

The above-mentioned internal gear 34 and carrier 22 are located at positions facing each other on the side sides, and the outer gear 34 and the carrier 22
tl] A ratchet gear 37 is carved on F1+j,
A pair of ratchet pawls 38 and 39 are engaged with the ratchet gear 37 in the forward and reverse directions, respectively.

The base end ゎ1汀ζ of the ratchet pawl 38 and 39 mentioned above is the shaft 40.
．． 40 is formed integrally with the gear case 30vC, and both ratchet pawls 38 and 89 are biased in the meshing direction by a pole spring 44. Note that the intermediate portion of the leaf spring 41 is attached to the gear case 30.

The width of the crosspiece of the engaging portion of the ratchet pawls 88 and 89 is provided so as to exceed the width notch of the ratchet gear 37 and enter into the 9J notch 42 of the internal gear 34, and further ψj
Release cams il+i 43 and 44 are formed in the left and right internal gears 34 of the notch 42, and the ratchet claws 38 degrees correspond to the forward and reverse outputs of the release cams 4B, 41j, and knee c:-8. 39 is regulated by the protrusion 35 and the fourth part 36 of the internal gear 34. Operate within "J range [)".

In FIG. 4, when the motor 8 rotates forward or reverse in the direction of the arrow, the internal gear 34 is positioned [1- l is rotated in the opposite direction until regulated. That is, when the motor 8 rotates forward and then counterclockwise, the internal gear 34 is rotated clockwise and the carrier 22 is rotated counterclockwise.

Trying to rotate in the direction of the needle. In this state, the ratchet pawl 38 is engaged with the ratchet gear 37, so the carrier 220 is prevented from rotating.
When the internal gear 34 described in f is rotated in the counterclockwise direction described in HF2, the release cam surface 43 fully pushes up the lower surface of the ratchet pawl 38 against the leaf spring 41, so that the ratchet pawl 38 is completely engaged. Since it is released, forward rotation of the rear wheel 22 is allowed.

When the motor is reversed, the rotation of the internal gear 34 causes the release cam surface 44 to disengage the ratchet pawl 39, allowing the carrier 22 to rotate in reverse.

As a result, the ratchet pawls 88 and 89 corresponding to the forward and reverse rotation of the motor output are disengaged at the initial stage of driving the motor 8.
The lock mechanism R is in the released state, and the output shaft 12 rotates i%i.
J is done.

On the other hand, when the motor 8 is in the OFF state, the output shaft 121i'
When forward and reverse rotation is performed at iJ, the Noji star gear 21 of the carrier 22 revolves, and this revolution rotates the internal gear 34, and this rotation direction becomes the same direction as the output shaft 12. In other words, the output shaft 12 rotates clockwise! [ij
J, the internal gear 34 also rotates clockwise. This clockwise turn! 0. Release cam surface 4 by IK
4 is displaced from the lower surface of the ratchet pawl 39, the ratchet pawl 39 receives the action force of the leaf spring 41, engages with the ratchet gear 37, and locks the output line 112 in the clockwise rotation kiJ'.

Note that for counterclockwise rotation of the output shaft 12, the ratchet pawl 38 meshes with the ratchet gear 37 (L'I).
J: Lock.

As a result, the ratchet pawls 38.89iSo are engaged with respect to the forward rotation 1ll-J from the output shaft 12 side, and the locking mechanism R is not activated. It can be used as a GO driver.

In addition, 45.45 is a stopper for the ratchet pawl 38.89, and 46 is a ratchet pawl d 8 , a hook (-) for 89 flH, which is attached to the gear cane 3o.
Still ratchet pawl 88.39 lf: 4 go 15/g
Is the solution 1? , cam surface 4B, , 4 as an example of flB village.
4 is shown, but as another means, internal gear-34
Place a pin on the side of the bottle, cross it, and use this bottle to tighten the ratchet claw 3.
8. You may try to completely release the mesh of 89.

In FIG. 2, the forward/reverse changeover switch 7 is formed in a ring member 47 which is in contact with the inner wall of the casing 3 and has a rotation Ua) l'f'F. A switch board 48 is provided opposite to tfl, and these constitute a low-return switch.

As shown in the fifth diagram, contacts 49 to 55 are formed at equal angles on the switch board 48, and the contact 52 is a common contact, and for example, a positive potential is supplied to the contact 49 to 55.
．． 55 is connected to the negative potential, E is connected, and the contact point 50.5
1 is connected to one terminal of the motor 8, and the door switch 53 and 54 are connected to the other terminal.

On the other hand, there are 2 pieces in Sungu Tori 47? tT$iA56 ,5
7, and when the switch 7 of this ring switch 47 is at the neutral stop potential l'i2'', one of the contacts 50, 51 and 4' of the two contacts 4 and 56 are connected simultaneously. , 1 is outside the other: i π57 is the contact point 53, 54 and 4- at the same time;
≦.

For example, when the ring 1 (1) rotation 47 is operated from neutral stop OFF to forward rotation ON, the -force aL contact 56 contacts the contact 49.50, and the other electrode 57 Since the contacts 52 and 53 are in contact with each other, a potential is applied to the motor 8 from the contact 53 to the contact 50, which is normal rotation control.Furthermore, the ring member 47 is rotated in the reverse direction by 0NiC rotation u'J.
When J is operated, the electrodes 56 and 57 are rotated in the opposite direction as described above, and the potential flows from the contact 51 to the contact 54K, which results in reverse control. In this manner, by operating the ring 1TLI 447, that is, the forward/reverse changeover switch 7, to turn on the forward/reverse direction, the motor 8 is restricted in forward/reverse rotation lX1l.

The above-mentioned common contact 52 has a contact 58 for controlling the power supply omF and oN, and a power terminal 59 is provided on the opposite side of the contact 58 on the entire switch board 48.

As shown in FIG. 2, an approximately U-shaped curved electrode 60 is fixed to the power supply terminal 59.
The free end (l-j Ill) faces the contact 58 described above.A spring 61 held by the trigger 6 is in contact with the outside of the free M11 portion of the electrode 60, and this trigger 6 is pushed inward, the pole 60 and the contact point 58 come into contact with each other, and the trigger is turned on.

Note that the trigger 6 is urged outward by a spring 62 at the bottom.

The electric screwdriver 1 incorporating the locking mechanism R in this manner is used in the following manner.

When using it as an electric motor, first turn on the forward/reverse switch 7.
is turned ON from the neutral stop OFF position in the desired forward or reverse direction of rotation, and then the trigger 6 is turned ON.

When the motor 8 rotates in the forward or reverse direction by operating the trigger 6, the output of the motor shaft 13 is sequentially transmitted to the first, second, and third stage planetary gear reduction mechanisms 9.10°11. .

The internal gear 84 of the third-stage reducer Tfli 11 moves in the opposite direction to the rotation direction of the motor 8 until the protrusion 35 is defined by the concave gjs 36. This rotation releases the meshing sound of the ratchet pawl 38'' or 39 in the direction corresponding to the rotational direction of the motor 8, and the lock mechanism R is released. 8 [nl 1ila
Direction (9 when Ill is free, output motor output +i
It can conduct +1+12 K and is used as an arm LQJ dry/<1.

On the other hand, when using it as a manual driver, the motor 8iO
Use it in FF state. In this OFF state, the forward/reverse changeover switch 7 is in the neutral stop OFF position, or the trigger 6 is not operated.

When a load is applied from the output shaft 12 side, the third stage reducer i;r
The internal gear 34 of i i i is rotated in the same direction as the rotation direction of the output shaft 120 until the protrusion 35 is restricted by the recess 36 . The release cam surface 43 or d-44 is placed below the ratchet pawl 88 or 39 +1ji L separation 1t-1.
By meshing with the carrier 22 and locking the carrier 22, the locking mechanism R becomes activated.

As a result, the forward and reverse directions in which the output shaft 12 rotates (11tf) are automatically locked by the ratchet pawls 38, 39, respectively, so that it can be used as a manual driver.

FIG. 6 shows an example in which the output shaft locking mechanism R is used in an electric butterfly valve. Inside the case 70, a forward/reverse motor, a planetary gear reduction valve, and an output shaft locking mechanism are constructed. The structure is the same as the components built into the electric screwdriver of the first embodiment, but it is designed to be strong and adaptable to the bee-shaped valve.

An output shaft 71 protruding from the case 70 is connected to a valve body 73 formed inside a valve spring 72, and the valve body 73 is opened and closed by driving the output shaft 71 in forward and reverse directions.

In this case, fluid pressure acts on the valve body 73, and this valve body 73
4 all the time, but the output shaft 71 is locked by the lock a mechanism inside the case 770, so this 't l;
IJ, it can be stopped. Finally, the magnetic brake 'IIc on the output shaft 71 becomes unnecessary for this electric medium type valve t.

(Figure 57 shows the output shaft locking mechanism; (::'5 R'fl
・'11 shows an example used in the September test. Inside the case 80, a forward/reverse motor, a planetary gear reduction mechanism, and an output shaft locking mechanism are configured, and these configurations are different from the electric motor in the first embodiment. It has the same configuration as the one built into the driver, but is designed to be more robust and adaptable to the driver.

Outstanding output from K780! i・Jl 81 is volume il
l:': Connected to 82, forward and reverse rotation of the output shaft 81
By jJ, the winding +11'482 is forwardly rotated, and the wire 8
The hook 84 is raised and lowered through three steps.

In this case, winding drum 82 times! When IiJ is stopped, the 411 weight of the hook attempts to fully rotate the winding drum 82, but the output shaft 81 is locked by the locking mechanism 41 in the case 80, so this cannot be prevented. can.

Therefore, this electric hoist does not require an electromagnetic brake V-key for the output shaft.

[Brief explanation of the drawing]

The drawings show one embodiment of this invention, and FIG. 1 is a side view of an electric screwdriver. FIG. 2 is a partially cutaway sectional side view. FIG. 3 is a perspective view taken along line A-A in FIG. 2. Figure 4 &: l: Enlargement of the footcutter claw; i: 'I view [
'MI. FIG. 5 is a front view of the switch board. FIG. 6 is a perspective view of another example of a butterfly valve. The seventh column 1 is a perspective view of a lightning bolt showing another example. 8...Forward and reverse rotation motor 11...Planetary gear reduction mechanism 12...Output shaft 34...Internal gear 35...Protrusion 36...Concave capital 37...
・Ratchet gear 88.89...Ratchet pawl 41...Flat spring 43.44:...Release cam surface Fig. 4 Fig. 5 $Q Fig. 7

Claims (1)

[Scope of Claims] 1. An output shaft to which the output of a forward/reverse motor is transmitted via a planetary gear reduction mechanism, wherein the internal gear of the planetary gear reduction mechanism is held rotatably over a predetermined range; The side faces the internal gear■゛L
A ratchet gear is connected to the output shaft of the motor, and a pair of ratchet pawls that engage with this ratchet gear in the forward and reverse directions are urged and engaged, so that each ratchet pawl corresponds to the forward and reverse directions of the motor output. An output shaft locking mechanism in which an internal gear is provided with a release member that operates to release each engagement within the rotating range of the ink-null gear.