JPS6014028Y2 - Torque limiter device - Google Patents

Description

[Detailed Description of the Invention] The present invention is characterized by the fact that when an overload occurs, the engagement of the pawl is released and power transmission is cut off, and the engagement of the pawl can also be released by operating a control lever. This invention relates to a limiter device.

A conventional torque limiter device is shown in FIG. 12a.

As shown in b, when an overload occurs, the claws 11', 12' are repeatedly engaged and disengaged, and the high surfaces 11'x, 1 of both the claws 11', 12' are
2'x, lower surface 11'3'* 12'y, and slope 11
The collision between 'a and 12'a caused a tremendous amount of noise.

Furthermore, due to this, the claws 11' and 12' were worn out prematurely.

Therefore, in the present invention, while the operating arm is held in a predetermined position, a plate that is interlocked with a movable clutch is fixed to the arm, both pawls are held in an approximately disengaged state, and the plate is It is an object of the present invention to provide a torque limiter device which eliminates the above-mentioned drawbacks by having the movable clutch rotated together with the arm by touching the arm so that the movable clutch can be operated manually.

Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, the torque limiter device 1 has a case 2, and the case 2 has an input shaft 3 and an output shaft 5.
is rotatably supported.

A gear 6 is fixed to the input shaft 3, and a gear 7 is rotatably supported by the output shaft 5. Both gears 6.
7 is always in mesh.

Furthermore, a movable clutch 9 is rotatably and slidably supported on the output shaft 5, and a spring holder 10 is fixed by a key 5a.

A fixed pawl 11 is formed on one side of the gear 7.
engages with a pawl 12 formed on one side of the movable clutch 9.

As shown in FIGS. 5 and 6, the claws 11 and 12 each have a slope 11 on the negative side thereof at an angle α from the base to the normal line.
a, 12a, and has gentle slopes 11b, 12b whose tip portions are formed by an angle β considerably larger than the angle α, for example, an angle β of 2α.

Further, the movable clutch 9 has a pawl 13 on the other side, and a shifter engagement 119a is formed in the center thereof.

The pawl 13 is always engaged with a pawl 15 formed on the spring holder 10, and a shifter fork 16 is engaged with the retaining groove 9a.

Further, a spring 17 is compressed between the movable clutch 9 and the spring holder 10, and urges the clutch 9 toward the gear 7.

On the other hand, the shifter fork 16 is fixed to a sick shaft 19 rotatably supported by the case 2.
As shown in FIGS. 2 and 3, 9 fixes a U-shaped plate 20 on the outside of the case 2.

The arm 2 is attached to the shifter shaft 19 between the U-shaped plates 20.
1 is rotatably supported, and the arm 21 is restricted from rotating in one direction by one side 20a of the plate 20.

Further, a bracket 22 is fixed to the upper surface of the plate 20, and a pin 23 having a handle 23a at its upper end is slidably supported on the bracket 22.

The pin 23 is constantly urged toward the plate 20 by a spring 26 compressed between the washer 25 fixed in the middle and the bracket 22.
The tip 23b of 3 passes through the plate 20 and is in sliding contact with the arm 21.

A hole 21a is bored in the arm 21, and a tip 23b of a pin can fit into the hole 21a.

Furthermore, a wire 27 is connected to the tip of the arm 21, and the wire 27 is connected to an operating lever 29, as shown in FIG.

Further, a leaf spring 30 is fixed and arranged on the case 2 near the tip of the arm 21, and the leaf spring 30 is located near the tip of the arm 21.
The arm 21 can be held in that position by a predetermined force.

Since the present invention has the above-described configuration, in a normal state where no overload occurs, the rotation of the input shaft 3 is transmitted to the gear 7 via the gear 6, and the rotation of the input shaft 3 is further transmitted to the gear 7 based on the bias of the spring 17. The signal is transmitted to the movable clutch 9 by engagement of .12.

The rotation of the clutch 9 is transmitted to the holder 10 via pawls 13, 15 which are always engaged, and further transmitted to the output shaft 5 via the key 5a.

Now, when an overload occurs, the rotation of the output shaft 5 tends to stop, and therefore the movable clutch 9 also tends to stop.

As a result, the movable clutch 9 has slopes 11a and 12a of the claws.
Based on this, the claws 11 move against the spring 17, and the claws 11,
12 is disengaged and power transmission is stopped.

At the same time, as the movable clutch 9 moves, the shifter fork 16 also rotates, and the rotation is transmitted to the plate 20 via the shifter shaft 19.

At this time, as shown in FIG. 7, the tip of the arm 21 is in contact with the leaf spring 30, and the arm 21 is prevented from rotating and held at a fixed position. By moving by a distance Rm, the tip 23b of the pin 23 fits into the hole 21a of the arm 21 due to the biasing force of the spring 26.

The plate 20 then becomes integral with the arm 21 and is held in place together with the arm 21.

Therefore, as shown in FIG. 8, the movable clutch 9 is held against the spring 17 in an approximately disengaged position where the claws 11, 12 are slightly engaged at their tips.

In this state, as shown in FIG. 9, the claws 11, 12 are joined only at the gentle slopes 11b, 12b formed by the angle β, so the high surfaces 11x, 12x and the low surfaces 11y, 12y1
And, the sliding engagement continues without generating intense noise due to the collision between the slopes 11a and 12a, and without generating a slight rattling sound due to the contact between the gentle slopes 11b and 12b.

At this time, even if the overload acting on the output shaft 5 is removed, the two pawls 11, 12 are in contact only at the gentle slopes 11b, 12b, so transmission will not suddenly restart.

Next, after removing the cause of the overload, when the pin 23 is pulled up against the spring 26 by the handle 23a, the tip 23b comes out of the hole 21a of the arm 21, and the integral relationship between the plate 20 and the arm 21 is released. Ru.

As a result, the plate 20 can move freely together with the movable clutch 9, the movable clutch 9 is moved by the spring 17, and the rotation of the input shaft 3 is transmitted to the output shaft 5 again by engaging the claws 11 and 12. be done.

Next, when the operating lever 29 is rotated as shown by the chain line in FIG. 4, the arm 21 is rotated via the wire 27 against the holding force of the leaf spring 30 as shown in FIG.

By rotating the arm 21, the arm side end and the plate 20
One side 20a of the plate 2 comes into contact with the arm 21.
0 also rotates.

The rotation of the plate 20 is caused by the shifter fork 1 via the shaft 19.
As a result, the movable clutch 9 is moved as shown in FIG. 11, and both pawls 11, 12 are completely separated and power transmission is stopped.

In the above embodiment, the plate 20 is configured in a U-shape, but the plate 20 is not limited to this, and it is of course possible to use an L-shape or the like as long as it has a rising side surface 20a on one side. .

As explained above, according to the present invention, when an overload occurs, the movable clutch 9 is held in a substantially disengaged position.
High surfaces 11x, 12x, low surfaces 11y, 12y1 and slope 1
Severe noise and wear caused by the collision between 1a and 12a can be prevented.

Further, unlike shearing pins, there is no need to replace them, so it is possible to improve work efficiency.

Furthermore, once an overload occurs, power transmission will not occur unless the pin 23 or other means is operated to release the connection between the arm 21 and the plate 20. This can prevent accidents from occurring.

Further, since the torque limiter function and the manual clutch function can be performed by one movable clutch 9, it can be constructed in a small size, and the structure can be simplified and manufactured at low cost.

In addition, the arm 21 and plate 20 are used as operating members for manual operation, and also function as holding members for the claws 11 and 12 in a substantially non-engaged state, thus preventing variations in individual machines due to assembly errors, etc. , it is possible to always maintain accurate positional relationships through the same operation.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view showing the entire torque limiter device according to the present invention, Fig. 2 is a plan view showing its operating section and disengaged approximate state holding section, Fig. 3 is its side view, and Fig. 4 is FIG. 5 is a diagram showing the operating lever, FIG. 6 is an enlarged view thereof, FIGS. 7 to 9 are operation explanatory diagrams showing the respective parts in an overload state, and FIGS. FIG. 11 is an operational explanatory diagram showing each part in a state where power transmission is cut off by operation, and FIGS. 12a and 12b are diagrams showing a conventional claw. 1...Torque limiter device, 9...
Movable clutch, 11...Fixed claw, 12...
...Claw, 19...Shifter shaft, 20...
Plate, 20a...-side, 21...
- Arm, 21a...L 23----- Pin, 29... Operation lever.

Claims (1)

[Scope of utility model registration request] A torque limiter comprising a movable clutch having a fixed pawl and a pawl biased toward the fixed pawl, and capable of intermittent power by engaging and disengaging the both pawls, further comprising: a thick shaft interlocking with the movable clutch; A plate is fixed to the sick shaft, an arm is rotatably supported on the sick shaft, and the arm is configured to abut one side of the plate so as to be able to rotate integrally in one direction, Further, a connecting means is provided to connect the plate and the arm at a predetermined position, and the arm is further connected to the operating lever and is configured to be held in a predetermined position by a predetermined force, so that the claw of the movable clutch is connected to the fixed claw. When the engaged torque is transmitted, the connecting means is in a position where the plate and arm are not connected, and the plate rotates with the movement of the movable clutch. Also, in the event of an overload when the movable clutch moves relative to the fixed pawl, the plate rotates. Based on the rotation to a predetermined position, a connecting means connects the plate to an arm held in a predetermined position to hold the movable clutch in a substantially disengaged position, and further applies a predetermined holding force to the arm by an operating lever. Torque limiter designed to move the movable clutch by rotating the plate together with the arm based on one side contact during manual operation when the plate is rotated against the resistance.
Device.