JP2001049950A - Self-locking device, and cable device using it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent rotation caused by reverse input by smoothly implementing rotation from the input side. SOLUTION: A plurality of arc parts 213 of an input side rotary body 21 are arranged outside a substantially disk-like part 222 of an output side rotary body 22, and stores in a circular housing 20 to form a drive control chamber 25, and a plate spring provided with a partitioning piece 241 integrated with a steel ball 23 is arranged therein. A clearance between the outer circumferential part of the substantially disk-like part 222 and an inner circumferential wall 201 of the circular housing 20 is large at an intermediate part between end faces 215, while a closing surface 224 for closing clearance is formed in the vicinity of the end face 215. When the input side rotary body 21 is rotated, the ball 23 is pushed by the end face 215, and the output side rotary body 22 is integratedly rotated by the rotation of a tenon 223 for rotation in a groove part 214. When the output side rotary body 22 is rotated, the ball 23 is caught between the closing surface 224 and the inner circumferential wall 201, to stop rotation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotation transmission mechanism for transmitting rotation (torque) of an operation side to an operation side, and more particularly, to a rotation transmission mechanism when a rotation input from the operation side is applied.
The present invention relates to a self-locking device having a reverse input prevention mechanism for preventing the rotation (torque) from being transmitted to the operation side, for example, to a cable device for converting the rotation transmitted to the operated side into a push-pull motion of a cable. It is suitable.

[0002]

2. Description of the Related Art As a mechanism for performing various remote operations, for example, a push-pull cable, a geared cable, or the like is wound around a rotating body such as a pulley, a cable gear, or a gear, and each cable is rotated by rotating the rotating body. In a cable device that drives a driven object connected to a cable by performing a push-pull motion of the cable, the driven object can be driven via the cable by rotating a rotating body.

However, when an external force is applied to the object to be driven, the external force of the object to be driven is applied to the rotating body on the operating side via a cable, and this is a reverse input, causing the rotating body on the operating side to rotate independently of the operation. May cause exercise. Therefore, in order to prevent the reverse input, a brake device is provided on a rotating body or a cable, etc., and a rotation preventing mechanism is provided separately from an operation member or the like.
As in the case of the invention such as 32676, the torsional body rotates following the rotation of the driving body by using a torsion coil spring.
There is a self-locking device that generates a braking force with respect to the rotation input of the subordinate body and requires a larger rotation driving force.

[0004]

When such a rotation preventing mechanism is provided separately from the operating member or the like as in the former case, it is necessary to release the rotation preventing mechanism each time the operation is performed, so that the operability is reduced. Reduced and inconvenient. Further, in each of the latter inventions, it is difficult to generate a braking force in both left and right rotations with one device, so that the driving body can be freely rotated in any of the rotation directions, and For a reverse input from the side, it is difficult to generate a braking force regardless of the rotation direction.

According to the present invention, the rotation operation of the operation side can be freely performed without performing the operation of releasing the rotation prevention, and even when the external force is applied from the operated side and the input is reversed, An object of the present invention is to provide a self-locking device including a reverse input prevention mechanism that prevents a rotating body on the operation side from rotating.

[0006]

According to the present invention, claim 1 is:
An active-side rotating body and a passive-side rotating body fitted so as to be able to rotate interlockedly with a predetermined play in the rotating direction are provided in a housing forming a short-cylindrical rotating chamber in a circumferential direction of the rotating chamber. A rotating transmission mechanism rotatably accommodated in the rotating chamber, wherein the active-side rotating body has a driving end face in a substantially centrifugal direction and a plurality of circular arcs arranged at a predetermined interval from each other in the rotating chamber. A drive unit having a shape is provided facing an inner peripheral wall of the housing, and the passive-side rotator includes a plurality of drive controls between the respective drive units of the active-side rotator by the housing and the respective drive units. A plurality of outer walls each having a diameter smaller than that of the driving unit so as to form a chamber, wherein the distance between the outer wall and the inner peripheral wall of the housing is maximized at a central portion between the driving units, and Non-convex arc shape so that it gradually decreases as approaching the part Made, to the each drive control chamber,
When the distance between the outer wall portion and the inner peripheral wall of the housing is located at the maximum and in the vicinity thereof, the distance between the outer wall portion and the inner peripheral wall of the housing becomes free, and the outer wall portion and the housing A wedge member that cannot be displaced between the outer wall portion and the inner peripheral wall of the housing when the distance between the inner peripheral wall and the inner peripheral wall is at a minimum and in the vicinity thereof,
An urging member, which is rotatably supported together with the driving unit and urges the wedge member disposed in the drive control chamber toward the driving end face of the driving unit, is disposed, and the wedge member and the urging member are arranged. The biasing member controls the wedge member to a displaceable position in the drive control chamber when the active rotator rotates, by the play between the active rotator and the passive rotator. The passive-side rotator is rotationally driven, and when the passive-side rotator rotates, the passive-side rotator is not allowed to rotate by controlling the wedge member to a non-displaceable position in the drive control chamber. .

According to a second aspect of the present invention, in the first aspect, the active-side rotating body and the passive-side rotating body are fitted with each other by a groove formed in the drive unit and the passive-side rotating body corresponding to the groove. It is performed by a tenon formed to protrude in a centrifugal direction from the outer wall of the body. Claim 3 is characterized in that, in claim 1 or 2, the wedge member is a hard ball member.

According to a fourth aspect of the present invention, in any one of the first to third aspects, the biasing member separates each of the drive control chambers at a central portion between the drive units, and separates each of the drive control chambers from each other. It is a leaf spring integrated with each other. Claim 5 relates to any one of claims 1 to 4,
The wedge members in the drive control chamber are both urged by the urging members on the respective driving end faces on both sides of the drive unit, and both the two-way rotation of the passive-side rotator is disabled. Features.

According to a sixth aspect of the present invention, in the self-locking device according to any one of the first to fifth aspects, the passive rotary body is provided with a cable drive such as a gear, a pulley, a cable gear for pushing and pulling a cable. And a cable device for driving a driven object via the cable.

[0010]

According to the present invention, when the active-side rotator rotates toward the end face to which the wedge member is urged, the drive end face in the direction of rotation of the arc-shaped drive section drives the wedge member. Drive toward the center of the control room.
At this time, the wedge member is displaced to the side where the distance between the outer wall of the passive-side rotator and the inner peripheral wall of the rotation chamber is larger, and the wedge member is
Since the inner peripheral wall of the housing forming the rotation chamber and the outer wall of the passive-side rotator can be displaced freely, the active-side rotator rotates smoothly without being blocked by the wedge member. Thus, the passive-side rotator fitted with a predetermined play to the active-side rotator is driven by the active-side rotator to rotate together. As a result, the passive rotator rotates simultaneously according to the rotation state of the active rotator, and the rotation of the active rotator can be transmitted to the passive rotator.

When the active rotating body does not rotate, the wedge member is urged toward the driving end face of the arc-shaped driving body by the urging member, and is stopped at that position. At this time, when the passive-side rotating body rotates, the wedge member is sandwiched between the passive-side outer wall and the inner circumferential wall of the circumferential chamber by the outer wall of the passive-side rotating body, which has a smaller distance from the inner circumferential wall of the circumferential chamber. As a result, it becomes impossible to displace, and the rotation of the passive-side rotator is prevented. As a result, the passive-side rotator rotates by the play, but no further rotation is possible. Therefore, even if an external force is applied to rotate the passive-side rotator, the passive-side rotator does not rotate, so no reverse input is applied to the active-side rotator, and the active-side rotator rotates. Can be prevented.

According to a sixth aspect of the present invention, there is provided a cable device in which a cable driving rotator such as a gear, a pulley, a cable gear, etc. for pushing and pulling a cable is provided on a passive-side rotator. Even when the cable is pushed or pulled from the target side, the driven-side rotator does not rotate, and the driven target can be maintained in the locked state.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a self-locking device according to the present invention will be described based on an embodiment using a cable device.
FIG. 1 shows a cable device 1 using the self-locking device of the present invention. The cable device 1 is a device in which an operation-side device 2 for performing a rotation operation and an operated-side device 3 that is rotationally driven in accordance with the rotation operation of the operation-side device 2 are connected via a control cable 4. The operation side device 2 is combined with an operation lever 5 that is manually operated, and the operated side device 3 is combined with an operated body 6 to be driven.

The operation side device 2 is a self-locking device of the present invention, and converts the rotational torque of the manually operated operation lever 5 into a push-pull movement of the control cable 4. As shown in FIG. 2, the operation-side device 2 fits the input-side rotator 21 with the output-side rotator 22 via the plurality of balls 23 and the leaf springs 24 in the circular housing 20. A reverse input prevention mechanism that transmits only the rotational motion of the input-side rotator 21 to the output-side rotator 22 and does not transmit the rotational motion from the output-side rotator 22 to the input-side rotator 21. It is.

The input-side rotator 21 is provided with an input shaft portion 212 protrudingly fitted on one side of the disk portion 211 so as to rotate integrally with the operation lever 5.
In the circumferential portion on the other side, four arc portions 213 are arranged at predetermined intervals, and are provided so as to be exposed to the side opposite to the input shaft portion 212. Here, as shown in FIG. 3, among a plurality of circular arc portions 213, a central portion of a pair of circular arc portions 213 facing each other around the rotation axis around the circumference of the disk portion 211 has an output side described later. Grooves 214 for rotationally driving the rotating body 22 are respectively formed, and form a fitting portion with the output-side rotating body 22.

The output-side rotator 22 is connected to the input shaft 21 described above.
The substantially circular disk portion 222 that rotates about the output shaft portion 221 that is located on the coaxial extension with the outer ring 2 has an outer diameter that is set slightly smaller than the inner diameter of the arc portion 213 of the input-side rotating body 21 described above. A rotating tenon 223 fitted with a predetermined play in the rotating direction with respect to the above-mentioned groove 214 projects from the outer peripheral portion of the substantially disk portion 222 in the opposite outer peripheral directions. It is formed.

The rotation mortise 223 is fitted in each groove 214, whereby the input side rotator 21 and the output side rotator 22 are positioned in each rotation direction, and the input side rotator 21 and the output side rotator 21 are positioned. The rotating body 22 does not shift in the rotating direction beyond a predetermined play, and each of the arc portions 213 and the substantially disk portion 2
The relative position in the rotation direction with respect to the outer periphery of the motor 22 is determined.

End faces 2 on both sides in the rotational direction of each arc portion 213
The drive control chamber 25 is formed by the inner peripheral wall 201 of the circular housing 20 and the outer peripheral surface of the substantially disk portion 222. When the output-side rotator 22 is positioned with respect to the input-side rotator 21, each of the arc portions 213
The outer peripheral portion of the substantially disk portion 222 located between the
5, the interval between the inner peripheral wall 201 of the circular housing 20 and the intermediate portion between the arc portions 213 is the largest, and the interval gradually decreases as approaching the rotation direction end surface 215 of each arc portion 213. As such, asymptotic surfaces 224 are formed, each of which gradually changes the distance from the inner peripheral wall 201 formed by the circular housing 20 according to the distance from the end surface 215.

In each drive control chamber 25, a ball 23 as a wedge member made of steel is arranged. The diameter of the ball 23 is between the inner peripheral wall 201 of the circular housing 20 and the asymptotic surface 224 of the output-side rotator 22, in the central portion between the end surfaces 215 of the adjacent arc portions 213 and in the vicinity thereof, with the inner peripheral wall 201. The distance from the inner peripheral wall 2 is smaller than the distance from the asymptotic surface 224 and near the end surface of the arc portion 213.
It is set so as to be larger than the distance between 01 and the asymptotic surface 224.

In the drive control chamber 25, a partition 241 of a leaf spring 24 is disposed to bias the ball 23 to any one of the end faces 215 between the adjacent end faces 215 of the adjacent arc portions 213. ing. Here, the partition 241
Each ball 23 is not biased toward each end surface 215 of the arc portion 213 in which the groove 214 is formed in the drive control room 25 partitioned by
It is urged toward only the end surfaces 215 on both sides of the arc portion 213 where the groove portion 214 serving as the outer portion where the asymptotic surface 224 is formed is not formed. Incidentally, in FIG.
Is a bearing, 27 is a washer, 28 is a circular housing 2
This is a plate for blocking 0.

As described above, the balls 23 are arranged, and each of the balls 23 is urged toward the end face 215 by the partition piece 241 of the leaf spring 24, so that the operation side device 20 operates as follows.

When the output side rotating body 22 is about to rotate (in the clockwise direction in FIG. 4), since the ball 23 is stopped by the leaf spring 24 locked by the arc portion 213 via the ball 23, the input The rotation of the rotation tenon 223 provided in the groove 214 of the side rotator 21 rotates by the amount of play, and the rotation causes the ball 23 to move away from the inner peripheral wall 201 as shown by a white arrow in FIG. Inner wall 201 by asymptotic surface 224 on the side where
Therefore, the output-side rotating body 22 is controlled to be unrotatable, and rotation due to reverse input is prevented.

Conversely, when the input-side rotator 21 attempts to rotate (rightward in FIG. 5), the output-side rotator 22
When rotated by the play of the groove 214 provided for the rotation tenon 223, the end surface 215 located in the rotation direction of the arc portion 213 pushes each ball 23 indicated by X in FIG. It displaces so as not to be sandwiched between 201 and the asymptotic surface 224. Along with this, partition 2
41 rotates the entire leaf spring 24 in the rotation direction of the input-side rotator 21 (right rotation direction in FIG. 5), and
In order to push each ball 23 indicated by Y in FIG. 5 on the end face 215 side opposite to the rotation direction of 13 by the partition piece 241 toward the rotation direction, that is, the end face 215 located on the opposite side to the rotation direction, The ball 23 is the inner peripheral wall 2
01 and the asymptotic surface 224 are displaced toward the narrower side. However, at this time, simultaneously, the rotation tenon 223 is driven by the groove portion 214, and the substantially disk portion 222 of the output side rotating body 22 tries to rotate and the asymptotic surface 224 also tries to rotate. And between the asymptotic surface 224 and
Since the output-side rotator 22 is freely displaced in the rotation direction, the output-side rotator 22 is integrally rotated with the input-side rotator 21 without being blocked.

With the above configuration, when the input-side rotating body 21 rotates, the output-side rotating body 22 of the operating-side device 2 simultaneously rotates together with the rotation of the input-side rotating body 21, but the output-side rotating body 22 attempts to rotate. In this case, since the rotation is prevented, the output-side rotator 22 and the input-side rotator 21 do not rotate together, and even if there is a reverse input from the output-side rotator 22 There is no.

As shown in FIG. 6, a cable driving member 250 as a cable driving rotator is fitted to the output shaft 221 of the output rotator 22 of the operation-side device 2 having the above configuration. 6A, a combination of a spur gear 251 and a rack 252 is used as the cable driving member 250, and a push-pull cable connected to the rack 252 is used as the control cable 4. In FIG. 6B, a pulley 253 is used as the cable driving member 250, and the cable end 254 of the push-pull cable used as the control cable 4 is fitted into the pulley 253. In FIG. 6C, a cable gear 255 is used as the cable drive member 250, and a geared cable 41 is used as the control cable 4. 6 (d), a pulley 256 is used as the cable driving member 250, and two pull cables 42 are used as the control cable 4.
Is used.

When the operated device 3 is driven via the control cable 4, the operated object 6 assembled to the operated device 3 is driven, and the rotation is transmitted. As described above, according to the present invention, when the input-side rotator 21 is rotated, the output-side rotator 22 can be rotated at any time in accordance with the rotation. It can be a device. Further, when transmission is performed using a cable or the like, even if an external force of a reverse input acts via the cable, the output-side rotating body 22 does not rotate. Can be prevented. The cable device 1 according to the present embodiment is suitable for remote control of a snowplow or an agricultural machine to which a load is applied from the operated body side. Further, it can be used for remote control in the case where an external force such as wind is applied as in the case of opening and closing windows of a building.

FIG. 7 shows a second embodiment of the present invention. Second
In the embodiment, as means for urging the ball 23, the other end surface 215 between the opposing end surfaces 215 in the drive control chamber 25 is used.
Is used. In this case, the coil spring 24 </ b> A can urge the ball 23 while constantly rotating with the rotation of the input-side rotating body 21, and the same operation and effect as in the above-described embodiment can be obtained.

In the above-described embodiment, the asymptotic surface 224 is the end face 2 of the two arc portions 213 where the groove 214 is not formed.
It is formed only in the part toward each of the 15
The space between the inner peripheral wall 201 of the circular housing 20 and the intermediate portion of each of the arc portions 213 is the largest, and all the outer peripheral surfaces from the respective portions toward the respective end surfaces 215 of the arc portions 213 on both sides are set as asymptotic surfaces 224. It may be formed.

[Modification] In the above embodiment, the arc portion 213 is used.
The balls 23 are arranged on both sides to urge each ball 23 against the end face 215 from both sides. However, the balls 23 are arranged only on one end face 215 on the rotation direction side to urge each ball 23. In this case, when rotating the input-side rotator 21, bidirectional rotation is possible, and the output-side rotator 2
In the case where the ball 23 is rotated, it is impossible to rotate only in the direction of the end surface 215 on the side where the ball 23 is disposed, and it is possible to rotate in the direction in which the ball 23 is urged. Can be used.

In the above embodiment, the groove 21 is formed in the arc 213.
4 to form a rotating tenon 22 that fits into the groove 214.
3, the input-side rotator 21 and the output-side rotator 2
However, if the input-side rotating body 21 and the output-side rotating body 22 have a predetermined play in the rotation direction, the contact surface between the disk portion 211 and the substantially disk portion 222 It is also possible to form a groove and a protrusion having a shape corresponding to the diameter or smaller than the diameter and in the shape of a "one" and fit them.
The shape of the fitting portion is not limited to the "one" character, but may be other shapes such as a "ten" character, a polygon, a star, etc.
It may be formed at the central portion between 1 and the substantially disk portion 222. In the above embodiment, a steel ball is used as the wedge member, but other shapes such as a columnar shape, a trapezoidal column shape, and a barrel shape may be used.

[Brief description of the drawings]

FIG. 1 is a perspective view schematically showing a cable device using a self-locking device of the present invention.

FIG. 2 is an assembly diagram showing a main part of the self-locking device of the present invention.

FIG. 3 is a sectional view showing a main part of the self-locking device of the present invention.

FIG. 4 is a cross-sectional view for explaining an operation of the self-locking device of the present invention when the output-side rotating body rotates.

FIG. 5 is a cross-sectional view for explaining an operation when the input-side rotating body rotates in the self-locking device of the present invention.

6A and 6B are schematic diagrams illustrating a method of driving a cable by an output-side rotating body in the cable device according to the present embodiment, and FIG.
Shows a combination of a spur gear and a rack, (b) shows a combination of a pulley and a push-pull cable, (c) shows a combination of a cable gear and a geared cable, and (d) shows a combination of a pulley and a pull cable. FIG.

FIG. 7 is a sectional view showing a main part of another embodiment of the self-locking device of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cable device 2 Operation side device (self-locking device) 20 Circular housing 21 Input side rotating body (active side rotating body) 22 Output side rotating body (passive side rotating body) 23 Ball (wedge member) 24 Leaf spring (biasing member) 25) Drive control room 201 Inner peripheral wall 213 Arc part (drive part) 215 End face (drive end face) 224 Asymptotic face (outer wall part)

Claims (6)

[Claims] An active-side rotating body and a passive-side rotating body fitted so as to be interlockedly rotatable with a predetermined play in the rotating direction are provided in a housing forming a short cylindrical rotating chamber. A rotation transmission mechanism rotatably accommodated in a circumferential direction of a rotating chamber, wherein the active-side rotating body has a drive end surface in a substantially centrifugal direction and is disposed at a predetermined interval from each other in the rotating chamber. A plurality of arc-shaped drive units are provided facing the inner peripheral wall of the housing, and the passive-side rotator is provided between the drive units of the active-side rotator, the housing and the respective drive units. A plurality of outer wall portions smaller in diameter than the driving portion so as to form a plurality of driving control chambers, wherein the outer wall portion has a space between the inner peripheral wall of the housing and a central portion between the driving portions. It becomes maximum and gradually decreases as approaching each drive When the space between the outer wall portion and the inner peripheral wall of the housing is located at a maximum and a portion near the inner wall of the housing, the outer wall portion and the inner space of the housing are formed in a non-convex arc shape. It is displaceable between the outer wall and the inner wall of the housing when the distance between the outer wall and the inner wall of the housing is at a minimum and in the vicinity thereof. And a biasing member rotatably supported with the drive unit and biasing the wedge member disposed in the drive control chamber toward the drive end face of the drive unit. The wedge member and the biasing member are configured to displace the wedge member within the drive control chamber during rotation of the active-side rotator due to the play between the active-side rotator and the passive-side rotator. By controlling the driven side rotating body, the driven side rotating body is rotationally driven, and at the time of rotation of the driven side rotating body, the passive side rotating body is controlled by controlling the wedge member to a non-displaceable position in the drive control chamber. A self-locking device characterized by being unable to rotate. 2. The fitting between the active-side rotator and the passive-side rotator includes a groove formed in the drive unit and a centrifugal direction from the outer wall of the passive-side rotator corresponding to the groove. 2. The method according to claim 1, wherein the step is performed by a tenon formed so as to protrude.
A self-locking device according to claim 1. 3. The self-locking device according to claim 1, wherein the wedge member is a hard ball member. 4. The driving member according to claim 1, wherein each of the drive control chambers is separated from each other at a central portion between the drive units, and is a plate-shaped spring integrated with each of the drive control chambers. The self-locking device according to any one of claims 1 to 3, wherein 5. A drive end face on both sides of the drive section,
5. The wedge member in the drive control chamber is both urged by the urging member, thereby disabling both rotations of the passive-side rotator in both directions. 6. Self-locking device. 6. The self-locking device according to claim 1, wherein the passive-side rotating body is a cable driving rotating body such as a gear, a pulley, or a cable gear for pushing and pulling a cable. A cable device using a self-locking device, wherein a driving target is driven via the cable.