JPH089770Y2 - Centrifugal governor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Industrial Field of the Invention The present invention relates to a centrifugal governor, which is used for limiting the descending speed of an electric shutter.

2. Description of the Related Art A conventional centrifugal governor used for limiting the descent speed of an electric shutter is, as shown in FIG. 7, a semi-circular governor weight (2) symmetrical to a governor boss (1).
(2) is pivotally attached at its one end through pins (3) and (3),
A spring (4) is connected between the other ends to give a reducing force, and a sub-weight (5) (5) and a lining shoe (6) (6) are attached to a part of the structure, which is electrically driven. When the shutter is lowered, it is attached to the rotating shaft of the forward / reverse point motor to prevent the lower end of the shutter from crashing into the ground due to the acceleration action due to the weight of the shutter.
When the rotation speed increases, the lining shoe (6) expands due to centrifugal force acting against the spring (4).
(6) is brought into pressure contact with a governor case (not shown) to apply a braking force to limit the descent speed to a constant descent speed.

Problems to be Solved by the Invention The above-mentioned conventional centrifugal governor causes a large imbalance during rotation, which causes vibration, resulting in high noise.
Since the lining shoe has few sliding surfaces, it wears quickly and
There was a problem that the life was short.

In addition, conventionally, the governor weight was restricted to the governor boss by the slanted long hole and the guide pin so as not to expand with respect to the rotation in the winding direction of the shutter but to expand with respect to the rotation in the unwinding direction. This is known from Japanese Examined Patent Publication No. 47-48228, but the governor weight cannot be brought into full contact with the outer peripheral portion due to eccentric arc movement and pressure contact with the inner peripheral surface of the governor case. Therefore, there is a problem that abrasion cannot be reduced.

Means for Solving the Problems The present invention has an annular governor boss mounted on a rotating shaft and a fan-shaped main body divided into equal parts around the circumference, and the rotary shaft is provided on an inner peripheral portion of the fan-shaped main body. A plurality of governor weights that have a leg rod extending in the axial direction of the governor boss, and are pivotally attached to the circumferentially equidistant positions of the governor boss slidably outward in the radial direction via the leg rod. A spring that applies a restoring force to each governor weight in the diameter reducing direction, and a cross section L arranged so as to be separated from the outer peripheral portion of the governor weight.
In a centrifugal governor comprising a fixed governor case having an annular inner peripheral surface, a lining shoe having an L-shaped cross section straddling the entire outer peripheral portion of each of the governor weights and the extension side axial end surface of the leg rod portion. Is attached.

Effect The centrifugal governor of the present invention has each governor weight slidable evenly in the radial direction, so that the weight balance around the rotary shaft is even and there is no vibration.
The noise is also small. In addition, each governor weight is linearly moved diagonally outward in the radial direction with respect to the governor boss, and is mounted in an L-shaped section across the entire outer peripheral portion thereof and the extension side axial end surface of the leg rod portion. The lining shoe can be widely and evenly pressed against the L-shaped annular inner peripheral surface of the governor case to generate a braking force. As a result, the pressure contact area of the lining shoe at the time of pressure contact increases, and The contact surface pressure can be reduced, wear can be reduced, and the life can be extended. In particular, not only the outer peripheral surface of the governor weight but also one axial end surface is used as the sliding surface, so that the braking force can be increased and the abrasion can be reduced, which is suitable for a large and heavy electric shutter.

Embodiment In FIGS. 1 and 2, (10) is an annular governor boss, (11) is a governor weight, (12) is a lining shoe, (13) is a spring, and (14) is a governor case.

The governor boss (10) has a bracket (10
a) is formed at evenly distributed positions on the circumference.

As shown in FIGS. 3 and 4, the governor weight (11) has a sector-shaped main body (11a) equally divided into the circumference, and a leg rod extending in the axial direction on the inner periphery of the sector-shaped main body. The governor boss (10) has a portion (11b), and the leg rod portion (11b) is pivotally attached to the bracket (10a) of the governor boss (10) by a pin (15) so as to be swingable in the radial direction.

The lining shoe (12) is attached to each governor weight (1
The mounting pin (16) is formed to have an L-shaped section across the entire outer peripheral portion of 1) and the extension side axial end surface of the leg rod portion (11b).
It is fixed by (16).

The spring (13) is stretched between the governor weights (11) in the circumferential direction via locking pins (17) (17),
The governor weights (11) are provided with a restoring force in the radial direction.

Each governor weight (11) has a fifth
As shown in the figure, a notch step (11c) is formed to secure the installation space for the spring (13), and a step (11d) for mounting the lining shoe (12) is also formed. There is. Notches (12a) for securing a space for installing the spring (13) are also formed at both ends of the lining shoe (12) in the circumferential direction.

As shown in FIG. 2, the governor case (14) is separated from the lining shoe (12) in the radial direction and the axial direction in the swinging range of the governor weight (11) in the radial direction. Corresponding L-shaped annular inner peripheral surface (14a) (14
b), and the radial inner peripheral surface (14a) is a tapered surface expanded by an angle α with respect to the axis, and the axial inner peripheral surface (14a)
b) is inclined backward by an angle β with respect to the plane orthogonal to the axis, which allows the governor weight (11) to radially expand outward about the pin (15) due to centrifugal force. When doing so, the outer peripheral surface and the axial end surface of the lining shoe (12) are in wide contact with each other.

The centrifugal governor of the present invention has the above-mentioned structure, and the governor boss (10) is fixedly coupled to the rotary shaft (19) of the forward / reverse rotation motor (18) for the electric shutter as shown in FIG. 6, for example. In FIG. 6, (20) is an electromagnetic brake connected to the centrifugal governor of the present invention, which has a rotating shaft (19).
The friction plates (20b) (20b) do not rotate with respect to the rotating discs (20a) (20a) that are keyed to, and are arranged so as to be movable in the axial direction, and braking force is constantly applied by the spring (20c). While the forward / reverse rotation motor (18) is energized, the electromagnet coil (20d) is energized to release the braking force. In the figure, (21) is the cover of the electromagnetic brake (20), ) Is an operation pull string for releasing an emergency braking force at the time of power failure.

Forward / reverse rotation motor (1
At the time of normal rotation or reverse rotation of 8), the braking force of the electromagnetic brake (20) is released and the rotation shaft (19) rotates, so that the shutter is wound up or down. When the shutter is unwound, the descent speed naturally accelerates due to the weight of the shutter. In such a case, in the centrifugal governor of the present invention, each governor weight (11) acts on the spring (1) by centrifugal force.
Against 3), the lining shoe (12) swings all around the pin (15) in the radial direction of the governor boss (10).
The outer peripheral surface and the axial end surface are evenly pressed against the radial inner peripheral surface (14a) and the axial inner peripheral surface (14b) of the governor case (14) to generate a large braking force to limit the descending speed of the shutter. To do.

Although the above-mentioned embodiment is applied to the electric shutter, it is obvious that it can be applied to other uses.

Effect of the Invention According to the present invention, since the load distribution around the rotation axis of each governor weight is uniform, whirling vibration due to an unbalanced load does not occur during rotation, noise can be significantly reduced, and centrifugal force is further reduced. Allows the entire outer peripheral surface of the lining shoe and the axial end surface to be evenly pressed against the L-shaped annular inner peripheral surface of the governor case, reducing the wear of the lining shoe and increasing the braking force for effective speed control. The action can be exerted and the durability can be improved.

[Brief description of drawings]

1 is a front view of the centrifugal governor according to the present invention with a governor case removed, FIG. 2 is a vertical side view of the same, FIG. 3 is an exploded front view of a governor weight, and FIG. 4 is a side sectional view thereof. 5, FIG. 5 is a sectional view taken along line VV of FIG. 3, FIG. 6 is a vertical sectional side view of an embodiment in which the present invention is applied to a forward / reverse rotation motor of an electric shutter, and FIG. 7 is a conventional centrifugal governor. It is a front view. (10) …… Governor boss, (11) …… Governor weight, (12) …… Lining shoe, (13) …… Spring, (14) …… Governor case.

Claims (1)

[Scope of utility model registration request] 1. A leg rod having an annular governor boss mounted on a rotary shaft and a fan-shaped main body divided circumferentially into equal parts, the leg rod extending in the axial direction of the rotary shaft on the inner peripheral portion of the fan-shaped main body. And a plurality of governor weights that are pivotally attached to the governor boss so as to be swingable outward in the radial direction via the leg rods at the circumferentially equidistant positions of the governor boss, and the direction of diameter reduction in each governor weight. And a cross-section L arranged so as to be spaced apart from the outer periphery of the governor weight.
In a centrifugal governor comprising a fixed governor case having an annular inner peripheral surface, a lining shoe having an L-shaped cross section extending over the entire outer peripheral portion of each of the governor weights and the extension side axial end surface of the leg rod portion. Centrifugal governor that is equipped with.