JPS592345Y2 - Differential reducer equipped with a safety device that can arbitrarily set the upper limit of output torque - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a differential speed reducer equipped with a safety device that can arbitrarily set the upper limit of the output torque taken out by the primary shaft as the output shaft.

To briefly explain the principle and structure of the differential reducer targeted in this invention, in Fig. 1, 1 is the primary shaft, 2 is the secondary shaft, 3 is the drum, and 4 is directly connected to the prime mover M. The drum 3 is driven via the belt 5 by the pulley.

The drum 3 can be driven not only by a belt but also by a gear or a chain.

6 is a primary sun gear; 7 is a primary planetary gear; 8 is a planetary gear shaft; 9 is a secondary planetary gear; 10 is a secondary sun gear; the secondary sun gear 10 is fixed to one end of the secondary shaft 2; A drive wheel 11 is fixed to the other end of the secondary shaft 2 .

Reference numeral 12 denotes a fixed arm, the flange of which is attached to the drive wheel 11, and the tip of which is arranged to operate against the safety device A.

Now, in the configuration shown in FIG. 1, the prime mover M applies a constant rotational force to the drum 3 via the belt 5, the secondary shaft 2 is stopped from rotating, and only the primary shaft 1 is rotated to extend its extension. It is assumed that the generated power is utilized by section 1-a.

In this case, the braking force for braking the torque generated on the secondary shaft 2, and therefore on the drive wheels 11, and the torque transmitted to the primary shaft 1, and therefore on its extension 1-a, are always in a constant relationship, and therefore Using this principle, the drive wheel 11
By adjusting the braking force above, it is possible to freely adjust the magnitude of the transmitted torque on the extension portion 1-a.

Various devices have been used in the past to adjust output torque using this principle, but all of these devices use, for example, a friction clutch as a means of braking the secondary shaft. Because of this mechanism, the device becomes complicated, inevitably increases in size, and is inconvenient in use.

In addition, when this is used as a safety device to limit the output torque of the primary shaft within a certain range, as in the present proposal,
With conventional equipment, when the prime mover is stopped once using a limit switch or the like and then restarted,
It is impossible to confirm or inspect the operation of the torque transmission system because the operation of the limit switch is repeated.

Normally, when a safety device is activated in such a torque transmission system, the cause is often an accident with the secondary shaft or its extension, or an abnormal load condition at the end of the extension, and this should be investigated and inspected. In order to achieve this, it is desirable to perform no-load operation of the output shaft system, but if this was attempted with conventional equipment, it would be impossible to achieve this without installing extremely complicated auxiliary mechanisms and complicated operating procedures. .

This invention was made in order to eliminate the above-mentioned inconveniences in the conventional apparatus, and will be specifically explained below based on the drawings showing one embodiment of the structure.

FIGS. 2 and 3 show the same safety device before and after activation, respectively.

The lever 13 is provided with a protrusion 13-a and a roller 13-b at both ends thereof, and the fixed arm 12 receives a rotational moment in the direction of the arrow P, and a push plate 12 attached to the tip thereof.
When the projection 13-a is pushed by the pressing force in the tangential direction of -a, the roller 13-b is pivoted so that it moves in the direction of the arrow Q while pressing on one surface of the swinging arm 14. supported.

The swinging arm 14 is swingably disposed with one end of the swinging arm 14 being supported by supports .

d is a dead point existing in the middle of the curved surface, so the radius of the curved surface is naturally set larger than the length of the arm for movement of the roller 13-b.

16 acts on the swinging arm 4 via the spindle 15 in a direction that applies a moment in the opposite direction to the moment exerted by the lever 13 near its tip.

Reference numeral 17 denotes an adjustment screw for adjusting the elastic force of the spring 16.

Now, it is assumed that a torque in the direction of arrow P is applied to the fixed arm 12 due to the operation of the differential speed reducer.

The push plate 12-a at the tip of the fixed arm 12 pushes the protrusion 13-a of the lever 13, and as a result, the roller 13-b rolls while pressing one side of the swinging arm 14.

When the swinging arm 14 is pushed down, the spindle 15 is pushed down by the lower surface 14-a of the tip, but the spindle 1
A spring 16 acts on the lower surface of the spring 5, and the movement of the swinging arm 14 is restricted by the balance between the downward force and the upward force of the spring 16.

That is, by appropriately adjusting the pressing force of the spring 16 using the adjustment screw 17, the limit of the torque generated by the secondary shaft 2 is regulated, and thereby the limit of the transmission l/rook of the primary shaft 1 is regulated. It is possible.

Next, when the load on the primary shaft 1 increases beyond the above limit, the downward force exerted by the lever 13 and the downward force exerted by the spring 16 are reduced.
When the balance with the lifting force is broken and the lever 13 moves in the direction of the arrow Q, and the roller 13-1) moves beyond the dead center d, the lever 13 is pushed by J- and A16. [Due to the force exerted on it, it moves in a toggle manner and reaches the state shown in FIG. 3.

As a result, the contact between the push plate 12-a of the fixed arm 12 and the projection 13-a of the lever 13 is released, the fixed arm 12 is released from the braking force, and starts rotating in the direction of arrow EtlP.
As a result, the next axis 1 becomes unloaded.

Reference numeral 18 denotes a microswitch, which has a lever 19 and a roller 19-a at its tip. When the swinging arm 14 descends and its tip surface 14-b moves the roller 19-a by a certain amount, the prime mover is activated. It is configured to cut off the power of M, and is attached to the safety device of the present invention as necessary.

Since the proposed device is constructed as described above, it is possible to keep the rotational torque borne by the primary shaft within the desired limit value by using an extremely simple device and operation, and as a result, the driven machine and differential The dynamic reducer and prime mover can be reliably protected based on theoretical values and can be operated with peace of mind.

In addition, by using a toggle type lever to release the brake on the secondary shaft, the brake is released completely automatically, and the output shaft is then allowed to continue operating with no load. It is possible to do so without requiring any human intervention.

Furthermore, if necessary, a handle may be attached to the swinging arm 14,
If the swinging arm 14 can be pushed down against the spring 16, the lever 13 can be easily returned to its old state.

In addition, since the position where the spindle 150 acts via the spring 16 is near the tip of the swing arm 14, the force of pushing down the swing arm 14 by the lever 13 can be countered with a relatively weak spring force, and the device can be further improved. It has superior effects compared to conventional devices, such as miniaturization.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of the differential speed reducer according to the present invention, and FIGS. 2 and 3 are sectional views showing different operating modes of the safety device. 1...Primary shaft, 1-a...Extension part, 2
...Secondary shaft, 3...Drum, 4...
...Pulley, 5...Belt, 6...
Primary sun gear, 7...Primary planetary gear, 8...
... Planetary gear shaft, 9 ... Secondary planetary gear, 10
...Secondary sun gear, 11...Drive wheel,
12... Fixed arm, 12-a... Push plate, 13.19... Lever, 13-a...
...Protrusion, 13-b...Roller, 14...
... Swinging arm, 14-a... Bottom surface, 14-b.
... Tip surface, 15 ... Spindle, 16
... Spring, 17 ... Adjustment screw, 18.
...Micro switch, 19-a...Colo, d...Dead point, A...Safety device, M
...the prime mover.

Claims (1)

[Scope of utility model registration request] a fixed arm fixed to one end of the secondary shaft of the differential reducer;
Lever 1 is pivotally supported so that it can move while pressing on one side of the swinging arm 14 in response to the pressing force in the tangential direction generated at the tip of the fixed arm due to the torque generated in the secondary shaft.
3, and a swinging arm 1 supported by a fulcrum and swingably arranged.
4, and the lever 1 near the tip of the swinging arm 14.
a spring 16 whose pressing force can be adjusted to apply a moment in the opposite direction to the moment caused by 3;
A curved surface is formed on one side of the swinging arm 14 so that the lever 13 has a dead center in the middle of the movement while pressing on one side of the swinging arm 14. 1. A differential speed reducer equipped with a safety device that can arbitrarily set an upper limit of output torque, characterized in that the differential speed reducer is configured to perform toggle type operation.