JP2014177824A - Brake device utilizing centrifugal force - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a brake device, utilizing centrifugal force, that can obtain large brake force without making a housing which has a brake mechanism built in a cylindrical part radially large in size.SOLUTION: A brake device includes: a housing 2; a thin and long rotary shaft 14 supported rotatably by the housing; a slide arm 24 having its lengthwise end part side rotatably coupled to the rotary shaft; and an arm receiver 12 which is arranged on a housing side opposite the slide arm. The slide arm swings away from the rotary shaft with centrifugal force generated by rotation of the rotary shaft. The slide arm swings to be pressed against the arm receiver, and the rotation of the arm is thereby braked. The slide arm swings on the rotary shaft around an axis substantially perpendicular to the center axis of the rotary shaft.

Description

  The present invention relates to a brake device using a centrifugal force used for applying a braking force to rotation of a rotating part such as a winding shaft such as a blind or a roll screen.

  A reduction device for a shielding device that decelerates an ascending / descending speed when the shielding material of the shielding device rises or descends so as to generate a braking force on the rotating shaft using a centrifugal force of a centrifugal body supported on the rotating shaft. Conventionally known speed reducers are known.

Japanese Patent No. 3691372

In a brake device that uses the centrifugal force of the centrifugal body, to increase the centrifugal force of the swingable centrifugal body that is pivotally supported on the rotating shaft, and to obtain a greater braking force, the centrifugal body's rocking fulcrum and the centrifugal body's freedom It is necessary to increase the distance between the ends and increase the length of the centrifugal body. Conventionally, as shown in Cited Document 1, a centrifugal body arranged in a cylindrical housing is rotatably supported around a rotation axis about an axis substantially parallel to the central axis of the rotation shaft. Yes. Therefore, in order to increase the distance between the swinging fulcrum of the centrifugal body and the free end of the centrifugal body and increase the size of the centrifugal body, it is necessary to lengthen the centrifugal body in the radial direction of the housing within the cylindrical housing. was there. In order to lengthen the centrifugal body in the radial direction of the housing, it is necessary to enlarge the entire brake device such as the centrifugal body support part of the rotary shaft and the housing in the radial direction according to the size of the centrifugal body. There is a problem that the size increases in the direction, that is, the height direction perpendicular to the rotation axis.
It is an object of the present invention to solve the above-mentioned problems by making it possible to obtain a larger braking force while reducing the space in the height direction of the brake device.

In order to achieve the above object, the present invention provides a braking device using centrifugal force that is attached to a device having a rotating part and applies a brake against the rotation of the rotating part. A rotating shaft that is rotatably supported and to which rotation of the rotating portion is transmitted, a sliding arm that is swingably connected to the rotating shaft side, and an arm that is disposed on the housing side so as to face the sliding arm An axis line extending in a direction perpendicular to the longitudinal direction of the rotating shaft (i.e., the sliding arm on the rotating shaft side). , An axis extending along a plane substantially perpendicular to the rotation axis), and a sliding arm that rotates in conjunction with the rotation of the rotation shaft is rotated by the centrifugal force caused by the rotation. Against the ream Parts so as to swing about a, characterized in that as the brake is applied with respect to the rotation of the sliding arm pressed against the slide arm to receive the arm by swing.
In the present invention, the sliding arm has a force point on the free end side of the sliding arm, a connecting portion with the rotating shaft of the sliding arm, and a sliding contact between the arm receiver and the sliding arm. A lever is used as an action point.
Further, the present invention is characterized in that the lever has a configuration in which an action point is placed between a fulcrum and a force point.
Further, the present invention is characterized in that the lever has a structure in which a fulcrum is placed between an action point and a force point.
In the present invention, the sliding arm is provided with one of a mounting portion having a mounting hole and a pin inserted into the mounting hole, and the mounting portion having the mounting hole on the rotating shaft side and the mounting hole. The other of the pins to be inserted is provided, the pin is fitted into the mounting hole of the mounting portion so as to be relatively rotatable, and the sliding arm is swingably connected to the rotary shaft side by the fitting. It is characterized by.
Further, the present invention is arranged such that a weight is arranged on the rotation shaft so as to be interlocked with the rotation shaft in the rotation direction and displaceable in a direction away from the rotation shaft, and the weight and the free end side of the sliding arm And the sliding arm swings with respect to the rotation shaft by the displacement of the weight in the separating direction.
According to the present invention, a cap is attached to the housing, a cylindrical portion is provided on the cap, the sliding arm is disposed facing the inner peripheral surface of the cylindrical portion, and the inner peripheral surface of the cylindrical portion is the arm. It is characterized by having received it.
According to the present invention, a cap is attached to the housing, a cylindrical portion is provided on the cap, the sliding arm is disposed facing the outer peripheral surface of the cylindrical portion, and the outer peripheral surface of the cylindrical portion is connected to the arm receiver. It is characterized by that.
Further, the present invention is characterized in that a speed increasing mechanism is arranged in the housing, and the rotation of the rotating portion is transmitted to the rotating shaft via the speed increasing mechanism.
According to the present invention, the speed increasing mechanism includes an internal gear provided in the housing, a planetary gear rotatably supported on a carrier rotatably supported by the housing, and a sun provided on the rotational shaft. And one of the planetary gears meshes with the internal gear and the other of the planetary gears meshes with the sun gear.

  In the present invention, the sliding arm that swings with respect to the rotating shaft by centrifugal force is rotatable with respect to the rotating shaft about an axis substantially perpendicular to the central axis of the rotating shaft. By making the sliding arm longer along the rotation axis without increasing it in the radial direction, the distance between the swing fulcrum of the sliding arm and the power point side can be set larger, and the brake device's radial larger size Without increasing the force, the centrifugal force applied to the sliding arm can be increased to generate a strong braking force.

It is the whole brake device AA line sectional view. It is a whole front view of a brake device. It is a right view of a brake device. It is a left view of a brake device. It is a top view which shows the brake mechanism in a housing. It is a disassembled perspective view of a brake device. It is sectional drawing of a speed increasing mechanism. It is a top view which shows other embodiment of the brake mechanism in a housing. It is sectional drawing which shows other embodiment of a brake device.

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.
FIG. 1 shows an embodiment of a brake device using centrifugal force according to the present invention, which includes a housing 2, a speed increasing mechanism built in the housing 2, and a brake mechanism built in the housing 2. The housing 2 is fixed to the substrate side of a device having a rotating part such as a blind or a roll screen, and a cylindrical part 2 a is formed on the main body of the housing 2. An internal gear 4 is formed on one inner peripheral surface of the cylindrical portion 2 a of the housing 2.

A disc-shaped cap 6 is fitted to the inner diameter portion of one end of the cylindrical portion 2a in the axial direction, and the tubular portion 8a of the carrier 8 is rotatably supported by the cap. A connecting hole is formed in the tubular portion 8a of the carrier 8, and the hole constitutes a connecting portion with a shaft of a rotating portion of the device such as the blind. Planet gears 10 are rotatably attached to a plurality of carrier pins formed on the carrier 8. One side of each planetary gear 10 meshes with the internal teeth of the internal gear 4.

A cap 12 is fitted and fixed to the inner diameter portion of the other end in the axial direction of the cylindrical portion 2a of the housing 2, that is, the direction parallel to the central axis. The cap 12 includes a cylindrical portion 12a that is fitted to the inner peripheral surface on the other end side of the cylindrical portion 2a of the housing 2, and a disk-shaped portion 12b that is integral with the cylindrical portion 12a and that is perpendicular to the axial direction. Yes. A rotating shaft 14 made of a sleeve extending along the axial direction of the cylindrical portion 2 a is disposed inside the cylindrical portion 2 a of the housing 2, and an outer periphery of a flange portion 14 c formed on one side of the rotating shaft 14. The surface is rotatably fitted to the inner peripheral surface of a disk-shaped partition wall 2b formed inside the cylindrical portion 2a of the housing 2, and the outer peripheral surface of the other end of the rotating shaft 14 is the disk of the cap 12 It is fitted and supported rotatably in the hole of the shaped portion 12b.

A sun gear 16 is formed in the small diameter tube portion on one end side of the rotating shaft 14, and the sun gear 16 meshes with the other side of each planetary gear 10. The internal gear 4, the carrier 8, the planetary gear 10, and the sun gear 16 constitute a planetary gear type speed increasing mechanism between the input side coupling portion of the apparatus and the rotating shaft 14. A weight holding portion 14b having an outer peripheral surface that is one step smaller in diameter than the large diameter portion 14a on the other side of the rotating shaft 14 is formed on one side of the rotating shaft 14, and the weight holding portion 14b is sandwiched between the rotating shaft 14 and the weight holding portion 14b. Are formed with a plate-like flange 14c and a step surface 14d perpendicular to the axial direction. A pair of plate-like locking bodies 18 and 20 project from the weight holding portion 14b of the rotating shaft 14 with an interval of 180 degrees in the circumferential direction.

A pair of weights 22 is disposed on the weight holding portion 14b of the rotating shaft 14 so as to face each other with the locking bodies 18 and 20 therebetween. Each weight 22 is formed of a belt-like curved member having an arcuate side surface, and both end surfaces are arranged in the vicinity of the locking bodies 18 and 20 and are set so as to rotate in conjunction with the rotating shaft 14 by the arrangement. Has been. When the rotating shaft 14 rotates at a high speed, a centrifugal force is generated in each weight 22 that rotates in conjunction with the rotating shaft 14, and each weight 22 generates a vertical surface of the step surface 14d of the rotating shaft 14 and the vertical portion 14c by the centrifugal force. In a state where the movement in the axial direction is restricted, it is set so as to be freely displaceable in a direction away from the outer peripheral surface of the weight holding portion 14b of the rotating shaft 14.

A pair of sliding arms 24 are arranged on the outer peripheral surface of the rotating shaft 14 in parallel with each other with an interval of 180 degrees in the circumferential direction. The sliding arms 24 and 24 are arranged to face each other along the longitudinal direction of the rotating shaft 14, and the sliding arms 24 and 24 extend to the rotating shaft 14 side in a direction perpendicular to the longitudinal direction of the rotating shaft 14. The shafts L1 and L2 (see FIG. 4) are connected so as to be swingable. The cross-sectional shape of the main body 24 a of each sliding arm 24 is formed in an arc shape having substantially the same curvature as the inner peripheral surface of the cylindrical portion 12 a of the cap 12. As shown in FIG. 6, a pair of attachment portions 24 b are formed on both sides of each other end of the arm body 24 a, and a hole formed in the attachment portion 24 b is formed on the other end side of the rotating shaft 14. The sliding arm 24 is rotatably fitted to a pin 26 projecting in a direction substantially perpendicular to the central axis of the shaft 14, whereby each sliding arm 24 is connected to the rotating shaft 14 via the corresponding pin 26. It is pivotally supported by the rotary shaft 14 about an axis extending along a substantially vertical plane, that is, axes L1 and L2 that are substantially perpendicular to the central axis of the rotary shaft 14.

The other side of the outer peripheral surface of each sliding arm 24 is slidably disposed on the inner peripheral surface of the cylindrical portion 12a of the cap 12, and faces the cylindrical portion 12a of the cap 12 of the main body 24a of the sliding arm 24. In the portion, a sliding contact which is an action point of the lever principle is formed. The arm main body 24a extends along the rotation shaft 14 from the vicinity of one end to the other end.

The rotation centers A and B (see FIG. 5) of the sliding arms 24 with respect to the rotation shaft 14 are disposed near the other end of the rotation shaft 14 and close to the plate-like portion 12 b of the cap 12. In the present embodiment, the other end side (left end side in FIG. 1) of each sliding arm 24 is pivotally supported on the other end side (left end side in FIG. 1) of the rotating shaft 14. Although not limited, each sliding arm 24 is turned in the opposite direction, one end side (right end side) of each sliding arm 24 is pivotally supported on one side of the rotating shaft 14, and the arm receiver is attached to the sliding arm 24. It may be located on one side and provided on the housing 2 side, and the weight 22 may be disposed on the other end side of the sliding arm 24. Further, the sliding arm 24 is not limited to a pair, and may be a plurality or one.

It should be noted that it is desirable that the axis lines L1 and L2 (axis lines extending in a direction perpendicular to the longitudinal direction of the rotating shaft 14) serving as the rotation center of the sliding arm 24 be exactly perpendicular to the central axis line of the rotating shaft 14. In carrying out the present invention, as long as the swinging motion of the sliding arm 24 due to the centrifugal force is possible, there may be a slight error within an allowable range. The pressure generated at the sliding contact formed between the outer peripheral surface on the other side of the sliding arm 24 and the inner peripheral surface of the cylindrical portion 12a of the cap 12 serves as a braking force. The pressure generated at the sliding contact is such that when each sliding arm 24 swings around the rotation centers A and B due to the centrifugal force caused by the rotation of the rotating shaft 14, the free end of each sliding arm 24 is applied as a force point. This occurs on the basis of the lever principle with the centers A and B as fulcrums and the sliding contact as the action point. This lever constitutes a second type lever in which the point of action is set between the fulcrum and the force point and close to the fulcrum.

By increasing the distance between the rotation centers A and B of the sliding arm 24 and the free end of the sliding arm 24 engaged with the weight 22, the centrifugal force applied to the sliding arm as the rotary shaft 14 rotates. It is possible to generate a strong braking force. The distance can be increased by increasing the sliding arm 24 in the axial direction of the rotating shaft 14 without increasing the diameter of the rotating shaft 14 or the diameter of the housing 2. One free end side of each sliding arm 24 is in contact with the outer peripheral surface of the corresponding weight 22. The weight 22, the sliding arm 24 and the cap 12 constitute a brake mechanism that applies a brake against the rotation of the rotating shaft 14.

Next, the operation of this embodiment will be described.
When the carrier 8 coupled to the rotating portion rotates due to the rotation of the rotating portion of the device such as a blind, the planetary gear 10 revolves around the tubular portion 8a of the carrier 8 in conjunction with the rotation of the carrier 8, and the planetary gear. The gear 10 rotates around the pin of the carrier 8 by meshing with the internal gear 4, the rotation of each planetary gear 10 is transmitted to the sun gear 16, and the rotating shaft 14 is accelerated to rotate. If the rotation of the rotation shaft 14 is a moderate rotation speed that does not separate the weight 22 from the rotation shaft 14, the sliding arm 24 slides against the inner peripheral surface of the cylindrical portion 12 a of the cap 12 by this rotation. There is no brake on contact.

When the rotation of the rotating shaft 14 becomes high speed, the weight 22 is displaced in a direction away from the weight holding portion 14b of the rotating shaft 14 by centrifugal force, and the free end side of the sliding arm 24 is pressed. With this pressing force, a swinging force in the counterclockwise direction is generated in the upper sliding arm 24 in FIG. Thus, a clockwise swinging force is generated, and the sliding arm 24 comes into pressure contact with the inner peripheral surface of the cylindrical portion 12a of the cap 12, and a braking force acts on the rotating shaft 14. The inner peripheral surface of the cylindrical portion 12a of the cap 12 that is in contact with the outer peripheral surface of the sliding arm 24 and constitutes a sliding contact constitutes an arm receiver.

In the above-described embodiment, the weight 22 and the sliding arm 24 are configured separately. However, the weight is integrally provided on the free end side opposite to the rotation centers A and B of the sliding arm 24 so as to slide. The arm 24 itself may be configured as a centrifugal body, and the weight 22 and the sliding arm 24 are not particularly limited to separate structures.
Further, in this embodiment, the rotation on the input unit side of the brake device is accelerated by the speed increasing mechanism and transmitted to the rotating shaft side, but it is not an essential requirement of the present invention to provide the speed increasing mechanism in particular. It is good also as a structure which does not provide a speed-up mechanism.

Alternatively, a one-way clutch mechanism may be provided in front of the input unit of the brake device so that rotation in only one direction is transmitted to the input unit of the brake device. Further, a friction body such as a brake tip or a brake shoe may be disposed on a relative rotation sliding portion between the arm receiver of the cap 12 and the sliding arm 24, and a sliding contact may be formed by these friction bodies. Further, an arm receiver that slidably receives the sliding surface of the sliding arm 24 and forms a sliding contact with the sliding arm 24 is provided on the housing 2 side, not on the cylindrical portion a side. You may do it.

  FIG. 8 shows another embodiment of the brake mechanism, in which a coil spring 28 is suspended between a pair of sliding arms 24 and 24. The pair of sliding arms 24, 24 are biased in a direction in which their free ends approach each other by a spring 28, and when the centrifugal force is not applied to the sliding arms 24, 24 by this biasing force, or centrifugal force is applied. When it is weak, the sliding arms 24, 24 and the arm receiver are not brought into contact with each other, so that the rotational torque of the rotary shaft 14 when the braking force is not generated is reduced.

In the embodiment of FIG. 8, when a strong centrifugal force acts on the sliding arms 24, 24, the sliding arms 24, 26 swing around the pins 26, 26 against the tensile force of the spring 28, and press against the arm receiver to rotate. A braking force acts on the rotation of the shaft 14.
FIG. 9 shows an embodiment in which a fulcrum is placed between the action point and the force point in the lever mechanism of the brake mechanism.

  In FIG. 9, the disk-shaped portion 12 c of the cap 12 is fitted and fixed to the housing 2, and the outer peripheral surface of the rotating shaft 14 is rotatably fitted to the inner peripheral surface of the cylindrical portion 12 d of the cap 12. An outer peripheral surface 12e of the cylindrical portion 12d of the cap 12 forms an arm receiver. A thick portion is formed at each other end of the sliding arm 24, and an inner peripheral surface 24e of the thick portion is formed to have substantially the same curvature as the outer peripheral surface 12e of the cylindrical portion 12d of the cap 12, and face each other. Has been placed.

An attachment portion 30 having an attachment hole is provided on the rotation shaft 14 along a direction substantially perpendicular to the rotation shaft 14, and a pin 32 provided on the slide arm 24 in an attachment hole of the attachment portion 30. Are rotatably fitted. The central axis of the pin 32 fitted into the mounting hole of the mounting portion 30 forms an axis extending along a plane substantially perpendicular to the rotation shaft 14. The mounting portion 30 and the pin 32 constitute a fulcrum of the lever, and the sliding arm 24 extends to the rotation shaft 14 along an axis extending along a plane substantially perpendicular to the rotation shaft 14 (that is, the rotation shaft 14). An axis extending in a direction perpendicular to the longitudinal direction is pivotally connected. The inner peripheral surface 24e of the thick portion of the sliding arm 24 is formed with a sliding contact that serves as an action point of the lever principle.
The other configuration of this embodiment is the same as that of the embodiment shown in FIG.

  In the above-described configuration, when the rotation shaft 14 is rotated at an increased speed, if the rotation of the rotation shaft 14 is a moderate rotation speed that does not separate the weight 22 from the rotation shaft 14, this rotation causes the sliding arm 24 to rotate. The inner peripheral surface 24e slides on the outer peripheral surface of the cylindrical portion 12d of the cap 12 and no brake is generated.

When the rotation of the rotating shaft 14 becomes high speed, the weight 22 is displaced in a direction away from the weight holding portion 14b of the rotating shaft 14 by centrifugal force, and the free end side of the sliding arm 24 is pressed. Due to this pressing force, a swinging force in the counterclockwise direction is generated in each sliding arm 24 around the pins 32 and 32 in FIG. A clockwise swinging force is generated, the inner peripheral surface of the sliding arm 24 comes into pressure contact with the outer peripheral surface 12e of the cylindrical portion 12a of the cap 12, and a braking force acts on the rotary shaft 14. The outer peripheral surface 12e of the cylindrical portion 12a of the cap 12 that is in contact with the inner peripheral surface of the sliding arm 24 and constitutes a sliding contact constitutes an arm receiver.

2 Housing 2a Tubular part 2b Bulkhead 4 Internal gear 6 Cap 8 Carrier 8a Tubular part 10 Planetary gear 12 Cap 12a Cylindrical upper part 12b Disk-like part 14 Rotating shaft 14a Large diameter part 14b Weight holding part 14c Ridge part 14d Step surface 16 Sun gear 18 Locking body 20 Locking body 22 Weight 24 Slide arm 24a Arm body 26 Pin 28 Spring 30 Mounting portion 32 Pin

Claims (10)

  A brake device using a centrifugal force that is attached to a device having a rotating part and applies a brake to the rotation of the rotating part, the housing, and a rotating part that is rotatably supported by the housing and that rotates the rotating part A rotating shaft that is transmitted, a sliding arm that is slidably coupled to the rotating shaft side, and an arm receiver that is disposed on the housing side so as to face the sliding arm. The sliding arm is arranged to face along the longitudinal direction of the rotating shaft, and the sliding arm is swingably connected to the rotating shaft side about an axis extending along a plane substantially perpendicular to the rotating shaft. The sliding arm that rotates in conjunction with the rotation of the shaft swings about the connecting portion with respect to the rotating shaft by the centrifugal force due to the rotation, and the sliding arm is pressed against the arm receiver by the swinging. Then Braking device that uses centrifugal force, characterized in that as the brake is applied with respect to the rotation of the movement arm.   The sliding arm uses the free end side of the sliding arm as a force point, a connecting point of the sliding arm with the rotating shaft as a fulcrum, and a sliding contact between the arm receiver and the sliding arm as an action point. The brake device using centrifugal force according to claim 1, wherein:   The brake device using centrifugal force according to claim 2, wherein the lever has a configuration in which an action point is placed between a fulcrum and a force point.   The brake device using centrifugal force according to claim 2, wherein the lever has a configuration in which a fulcrum is placed between an action point and a force point.   One of a mounting portion having a mounting hole and a pin inserted into the mounting hole is provided on the sliding arm, and a mounting portion having a mounting hole and a pin inserted into the mounting hole are provided on the rotating shaft side. The other is provided, the pin is fitted in a mounting hole of the mounting portion so as to be relatively rotatable, and the sliding arm is slidably connected to the rotating shaft side by the fitting. A brake device using the centrifugal force according to Item 1.   The rotating shaft is interlocked with the rotating shaft in the rotating direction, and a weight is disposed so as to be displaceable in a direction away from the rotating shaft, and the weight and the free end side of the sliding arm are engaged with each other. 2. The brake device using centrifugal force according to claim 1, wherein the sliding arm swings with respect to the rotating shaft due to displacement of the weight in a separating direction.   A cap is attached to the housing, a cylindrical portion is provided on the cap, the sliding arm is disposed facing the inner peripheral surface of the cylindrical portion, and the inner peripheral surface of the cylindrical portion is used as the arm receiver. The brake device using centrifugal force according to claim 1.   A cap is attached to the housing, a cylindrical portion is provided on the cap, the sliding arm is arranged facing the outer peripheral surface of the cylindrical portion, and the outer peripheral surface of the cylindrical portion is used as the arm receiver. The brake device using centrifugal force according to claim 1.   The brake device using centrifugal force according to claim 1, wherein a speed increasing mechanism is arranged in the housing, and rotation of the rotating portion is transmitted to the rotating shaft via the speed increasing mechanism. .   The speed increasing mechanism comprises an internal gear provided in the housing, a planetary gear rotatably supported on a carrier rotatably supported by the housing, and a sun gear provided on the rotational shaft, 2. The braking device using centrifugal force according to claim 1, wherein one of the planetary gears meshes with the internal gear, and the other of the planetary gears meshes with the sun gear.

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