JPH0861457A - Rotation transmitting device capable of rotating output shaft by input shaft - Google Patents

Abstract

PURPOSE: To provide a rotation transmitting device capable of rotating an output shaft by an input shaft. CONSTITUTION: An output shaft 22 and an input shaft 21 are arranged so that their center line may be aligned with each other, and one or more transmission pins 24 are projectingly provided at the positions except two adjacent positions where the circumference of the end surface of a body 23 to be rotated of the output shaft 22 is divided into several parts, and two braking pins 25 are projectingly provided at two adjacent positions of the body 23 to be rotated. A friction plate 26 of snap ring shape which forms two recessed parts 27 and is provided with a lock cam surface to be abutted on the braking pins 25 is brought into internal contact with a casing 29. A plurality of driving holes 30 in which pins 24, 25 are inserted are cut in a body 34 of revolution, and two projected parts 32 for releasing the braking which are located in the recessed parts 27 and capable of pressing their edges are provided on the inner end surface of the body 34 of revolution. This improves the durability for the long-term use, and permanently keeps the smooth rotational motion to demonstrate the reliability in performance.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to, for example, means for rotationally driving a sheet winding shaft of a ventilation ventilation device which winds a covered sheet of a vinyl house around a sheet winding shaft to open and close it, or like the sheet winding shaft, an output shaft. The present invention relates to a rotation transmission device that is widely used for applications in which it is difficult to rotate in either forward or reverse directions due to a load or the like, and whose output shaft is rotatable only by an input shaft.

[0002]

2. Description of the Related Art Conventionally, as a rotation transmission device in which an output shaft can be rotated only by an input shaft, Japanese Patent Application Laid-Open No. 1-58242 by the applicant of the present invention
Those described in Japanese Patent Publication No. 266359 are known. However, the structure and operation of this rotation transmission device are complicated, and the inner peripheral surface of the roller and the inner peripheral surface of the casing are rattlingly scratched by repeated use over a long period of time, and smooth operation cannot be expected. In addition, it is not easy to assemble because there are many parts such as the roller as the lock body, the lock body push wall in the rotated body of the output shaft, the lock body receiving bottom, the convex portion of the input shaft, and the casing.

Therefore, the applicant further devised a rotation transmission device according to Japanese Utility Model Laid-Open No. 6-45151 illustrated in FIG.
This is because two transmission pins h and h are provided at about half of the circumference of the rotated body t of the output shaft located on the opposite side of the paper surface of FIG. 3, and two locks are provided at the remaining half. The pins w and w are provided on substantially the same circumference. Further, a snap ring-shaped friction plate j having two recesses m, m formed at symmetrical positions on the inner peripheral surface k and further provided with two lock cam surfaces n, n is rotatably provided inside the casing p for the half brake. Installed in a state, the transmission pin h and the lock pin w are arranged on the inner peripheral side of the friction plate j. On the other hand, a drive plate s is provided on the input shaft located on the front side of the paper surface of FIG. 3, the drive plate s is located between the transmission pin h and the lock pin w, and both ends of the drive plate s are located. It is located in the recesses m, m of the friction plate j. Therefore, when the input shaft is rotated in the A or B direction, first, the end of the drive plate s is rotated so as to abut against the edge m ′ or m ″ of the concave portion of the friction plate j and push the drive plate s. When the output shaft is rotated in the A or B direction, it is locked by contacting a transmission pin h positioned forward in the rotational direction and transmitting the rotation to the rotated body t via the transmission pin h. The pin w rotates integrally and comes into contact with the lock cam surface n at the closest position to spread the friction plate j by the cam action, so that the outer peripheral surface g of the friction plate j is strongly pressed against the inner peripheral surface q of the casing p. As a result, an excessive braking force is exerted, and rotation of the rotated body t is completely disabled.

[0004]

[Problems to be Solved by the Present Invention]
The rotation transmission device according to Japanese Patent No. 5151 is disclosed in Japanese Patent Laid-Open No. 1-2663.
The device related to No. 59 is improved, and it is an excellent device with a small number of parts and easy to assemble. However, the following problems have been pointed out in this device as well. The drive plate s functions to contact the edge m ′ or m ″ of the recess m of the friction plate j to rotate the friction plate j, and further to contact the transmission pin h to transmit the rotational force to the rotating body t. However, since the driving plate s is manufactured in a considerably large plate shape, it is troublesome to process and hinders downsizing of the structure.

The output shaft and the input shaft are butted in such a manner that their respective center lines coincide with each other, and only supported by the casing p and not at the central portion between the butted surfaces by the shaft. It lacks in smoothness and tends to rattle.
As a result, the internal mechanisms such as the friction plate j and the lock pin w may be eccentrically frictioned to damage the inside, and the rotation may not be smooth, or the durability may be significantly reduced.

The drive plate s having a shape protruding in the axial direction is
Due to the rotation, the grease filled in the casing p as a lubricant is collected and made ubiquitous in one place, which hinders the lubrication effect, causes rusting, and deteriorates wear and durability. Further, there is a drawback that it is difficult to endure high-speed driving by electric driving in which a motor is connected to the input shaft for driving.

Therefore, an object of the present invention is to solve the above-mentioned problems all at once, has a simple structure and is easy to assemble, maintains a smooth rotary motion permanently even if it is used for a long period of time, and is durable. It is an object of the present invention to provide a rotation transmission device having a further improved structure, excellent oil lubricity, suitable for high-speed driving, and improved in a structure that maintains performance reliability for a long time.

[0008]

As a means for solving the above-mentioned problems of the prior art, a rotation transmission device according to the present invention, which is capable of rotating an output shaft by an input shaft, includes an output shaft 22 and an input shaft 21 each having a rotation transmitting device. With a series of arrangements in which the center lines coincide with each other, the rotating body 23 at the inner end of the output shaft 22 and the rotating body 34 at the inner end of the input shaft 21 are axially butted in the casing 29. A transmission pin 24 having one end fixed in the rotated body 23 and projecting in the axial direction at positions other than two adjacent positions among positions where the circumference of the end face of the rotated body 23 is divided into several, for example, into four. Multiple (2 in case of the above 4 divisions
The control parts (braking pins 25, 25) fixed in the rotating body 23 and protruding in the axial direction are provided at the remaining two positions, and at least two positions of the inner peripheral edge 26a (approximately 180 ° symmetry) are provided. (2 positions) in which concave portions 27, 27 are formed, and a lock cam surface 28 with which the braking portion abuts is provided on the inner peripheral edge 26a near the open end, and a snap ring-shaped friction plate having a restoring force inward in the radial direction. The outer peripheral edge 26b is inscribed in a semi-brake state in which the outer peripheral edge 26b is rotatable with respect to the inner peripheral surface 29a of the casing 29, and the transmission pin 24 and the braking portion are arranged on the inner peripheral side of the friction plate 26, The rotating body 34 is provided with a plurality of required driving holes 30 for individually inserting the transmission pin 24 and the braking portion of the rotated body 23.
On the inner end face of the friction plate 26, two braking releasing projections 32, 32 that are located in the recess 27 of the friction plate 26 and that can push the edge 27a of the recess 27 are installed, and the transmission in the drive hole 30 is performed. The circumferential size of the gap portion between the pin 24 or the braking portion is approximately equal to or slightly longer than the circumferential size of the gap portion between the concave portion 27 and the braking releasing convex portion 32.
The casing 29 is locked to a fixed system to stop the rotation, respectively.

A central shaft 23a is provided at the center of the end face of the rotating body 23, and the central shaft 23a has a shaft hole 34.
It is also characterized in that a is inserted into and supported by a shaft hole 34a formed in the central portion of the rotating body 34.

[0010]

When the input shaft 21 is rotated in the forward / reverse direction (direction of arrow A or B in FIG. 2B), the braking release convex portion 32 first rotates forward to form the concave portion 27 of the friction plate 26. The friction plate 26 is struck against the edge 27a and pushed around. Almost at the same time, the hole wall of the drive hole 30 provided in the rotating body 34 of the input shaft 21 hits the transmission pin 24 and the control portion (braking pin 25) and transmits the rotational force to each. Therefore,
The output shaft 22 is freely rotated in the same direction at the same speed in both the forward and reverse directions by the input shaft 21 (FIG. 2B).
Since the central shaft 23a protruding from the rotated body 23 is inserted into the shaft hole 34a of the rotating body 34 and supported by each other, the input shaft 21 and the output shaft 22 rotate stably (FIG. 2).
A). Moreover, during rotation, the claw-shaped braking release convex portion 32 stirs the grease in the casing 29 to maintain a good state, so that the lubrication for rotation is always effectively maintained. Therefore, it is suitable for connecting the motor to the input shaft 21 and driving at high speed.

On the contrary, when the output shaft 22 is rotated in the forward or reverse direction, the control unit (2) which rotates integrally with the output shaft 22 is rotated.
The braking pins 25, 25 of the book hit the lock cam surface 28 which is stationary at the closest position in the forward rotation direction, and the friction plate 26 is expanded by the cam effect. Therefore, the outer peripheral edge 26b is pressed against the inner peripheral surface 29a of the casing 29 to generate an excessive braking force, and the rotation of the output shaft 22 itself is surely completely prevented (FIG. 2B).

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention shown in the drawings will be described below. In the rotation transmission device shown in FIG. 1 and FIG. 2, reference numeral 21 in the drawings is an input shaft and 22 is an output shaft. The rotating body 23 is integrally provided at the inner end of the output shaft 22 and
A rotary body 34 is integrally provided at the inner end portion of the above, and both are abutted in series on a common center line inside the casing 29. The inner diameter of the casing 29 is about 48 mm, and the thickness of the rotating body is about 8 mm. A central shaft 23a is projected in the axial direction at the center position of the end face of the rotating body 23, and the central shaft 23a is inserted into a shaft hole 34a formed in the central portion of the rotating body 34 so as to be rotatable. The input shaft 21 and the output shaft 22 are supported so that a series of butted states in which the center lines of the input shaft 21 and the output shaft 22 coincide with each other are maintained, and rotation can be smoothly transmitted.

The rotating body 23 of the output shaft 22 is provided with a plurality of transmission pins 24 and braking pins 25 which are fixed by a means such as embedding one end and project the other end axially. The outer shape of each pin is about 5 mm and the protruding length is about 13 mm.
Is. As shown in FIG. 2B, two transmission pins 24 are fixed to two adjacent positions among the positions obtained by dividing the circumference of the end face of the rotated body 23 into four (preferably divided into four). However, the number of the transmission pins 24 is not limited to two, and for example, the circumference may be divided into six and provided at four positions except for two adjacent positions. The transmission pin 24 is provided at a position where it can be inserted into a drive hole 30 described later in the neutral state of FIG. 2B. As shown in FIG. 2B, two other braking pins 25 are fixed at the two remaining (adjacent) positions on the end surface of the rotated body 23. The braking pin 25 also has a driving hole 3 which will be described later.
It is arranged at a position where it can be inserted into 0, and is provided at a position where it abuts on the lock cam surface 28 at the closest position. The transmission pin 24 and the braking pin 25 protruding in the axial direction as described above are arranged on the inner peripheral side of the friction plate 26. In addition,
The main function of the braking pin 25 is to immediately contact the lock cam surface 28 in the rotational forward direction when the output shaft 22 rotates to expand the friction plate 26 by the cam effect and exert the control force. The present embodiment is not limited to this pin, and the same action and effect can be expected even if it is implemented by a one-piece configuration in which the positions of two pins are connected in series.

The friction plate 26 is made of a spring steel plate by punching and pressing into a substantially C-shaped snap ring shape, and is provided at least at two positions on the inner peripheral edge 26a, preferably at right and left positions symmetrical about 180 °. Two recesses 2
7 and 27 are provided, and a linear lock cam surface 28 with which the braking pin 25 abuts is provided on the inner peripheral edge 26a near the open end. The lock cam surface 28 is a kind of inner cam whose radius changes inward. The lock cam surface 28
The shape is not limited to a linear shape as long as a braking force is generated by the pressure contact of the braking pin 25. The outer peripheral edge 26b of the friction plate 26 is inscribed in a rotatable semi-brake state with respect to the inner peripheral surface 29a of the cylindrical casing 29 in the illustrated example, but is slightly loose to the extent of being rotatable. You may install by a diameter difference. Since the friction plate 26 is formed in a substantially C-shaped snap ring shape,
It can be expanded, but it generates a restoring force inward in the radial direction.

Therefore, when the rotating body 23 of the output shaft 22 is rotated in the direction indicated by reference sign A or B from the neutral state of FIG. 2B, immediately any one of the braking pins 25 is located at the immediately preceding position in the rotational direction. It abuts on the lock cam surface 28 and expands the friction plate 26 radially outward along the lock cam surface 28. As a result, the outer peripheral edge 26b of the friction plate 26 is strongly pressed against the inner peripheral surface of the casing 29, and an excessive braking force is generated so that the friction plate 26 cannot rotate. Due to the configuration of the two braking pins 25 and the two lock cam surfaces 28 corresponding thereto, the output shaft 22 cannot rotate in both the forward and reverse directions. Although one friction plate 26 is used in the present embodiment, a plurality of friction plates 26 may be used in combination to ensure a stronger and more reliable operation.

On the other hand, the rotating body 34 of the input shaft 21 is provided with four drive holes 30 through which the transmission pins 24 and the braking pins 25 of the rotated body 23 can be individually inserted (see FIG. 1). The drive hole 30 has an elliptical shape in the circumferential direction and penetrates in the axial direction. Moreover, the circumferential size of the gap with the outer diameter of the transmission pin 24 (or the braking pin 25) inserted into each drive hole 30 is the circumference of the gap with the braking releasing convex portion 32 of the concave portion 27. It is formed to be approximately equal to or slightly larger than the directional length. Two pawl-shaped (or pin-shaped, etc.) braking release projections 32, 32 located in the recess 27 of the friction plate 26 are axially projected on the inner end surface of the rotating body 34. The end portion of the braking release convex portion 32 comes into contact with the edge 27a of the concave portion 27 of the friction plate 26 to push the friction plate 26 and rotate it in the casing 29.

Therefore, when the input shaft 21 is rotated in either the forward or reverse direction (the direction of arrow A or B in FIG. 2B), the braking releasing convex portion 32 first rotates forward and the front portion of the concave portion 27 of the friction plate 26 is rotated. The friction plate 26 is struck against the edge 27a and pushed around. At approximately the same time, the hole wall of the drive hole 30 of the input shaft 21 strikes the transmission pin 24 (and the braking pin 25) and transmits the rotational force to the rotated body 23 and the output shaft 22. Thus, the rotation of the input shaft 21 can be freely performed in either forward or reverse directions, and the rotation is performed from the drive hole 30 to the transmission pin 2.
4, transmitted to the output shaft 22 through the rotated body 23, and the output shaft 22 is rotated in the same direction at the same speed. At the time of rotation, since the central shaft 23a of the rotated body 23 is fitted into the shaft hole 34a of the rotating body 34 and supported by each other, the rotation of the input shaft 21 and the output shaft 22 is performed in a stable state. Therefore, when the braking pin 25 is composed of the one-piece braking portion described above, the driving hole is also shaped and sized so that the same piece can be inserted therein. Further, the casing 29 is filled with grease (lubricating oil) for smoothing the rotational movement, but the rotating body 3
4, the claw-shaped braking releasing convex portion 32 stirs the grease and maintains a good lubrication state, so that the output shaft 22
The rotation is smoothly transmitted to.

A known speed reducing mechanism, for example, a planetary gear type speed reducing mechanism is incorporated in the intermediate portion between the input shaft 21 and the rotating body 34.
It is also possible to implement the configuration in which the rotational load of the input shaft 21 is reduced to a fraction. Further, a worm type or bevel gear type speed reducing mechanism capable of rotating the input shaft by a transmission shaft that is rotated from a direction perpendicular to the input shaft 21 for the ventilation window for the valley at a high place is also provided. .

The open end surface of the casing 29 is sealed by a side cover 31 as shown in FIG. 2A. A bearing 31 a of the input shaft 21 is provided on the boss portion of the side cover 31. The casing 29 is provided with a bearing 29b of the output shaft 22. As is apparent from the above description, the rotating body 23 and the friction plate 26 are provided in the casing 29.
The rotary body 34 and the rotary body 34 are assembled in a series of relations in the axial direction, and the casing 29 is locked by a fixed system (not shown) to stop the rotation.

In summary, it is absolutely impossible for the output shaft 22 to rotate due to an external force or a load in both the forward and reverse directions. The output shaft 22 can be freely moved in the forward and reverse directions only by the input shaft 21. Can be rotated. Therefore, this rotation transmission device is suitable for applications in which the output shaft 22 does not rotate arbitrarily or carelessly due to a load or the like, or for various applications in which reliable positioning of the rotational position of the output shaft 22 is required. Can be used.

[0021]

In the rotation transmitting device according to the present invention in which the output shaft can be rotated by the input shaft, the friction plate 26 is rotated only by the braking releasing convex portion 32, and the driving holes are formed in the transmitting pin 24 and the braking pin 25. Since the rotational force is transmitted through the hole wall of 30, the role of each member can be reasonably maintained, and it can withstand long-term use sufficiently, and can be improved in strength and durability. Since the central shaft 23a of the rotated body 23 is inserted into and supported by the shaft hole 34a of the rotating body 34, smooth rotational motion is permanently maintained, and the lubricity is excellent, so that the reliability of performance is high. It is also suitable for high speed drive. Since a further downsized device can be obtained and it has excellent flexibility in use, it can be used for opening and closing skylights and side windows, or for opening and closing ventilation ventilation devices in the valleys of multi-storey vinyl houses and other rotary drive means. Further, it can be effectively used for various purposes as a rotation driving means of a cargo handling machine such as a hoist or a chain block.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a rotation transmission device.

FIG. 2A is a sectional view taken along the line II-II of the rotation transmitting device shown in B, and B is a sectional view taken along the line II of FIG.

FIG. 3 is a sectional view of a conventional example.

[Explanation of symbols]

 21 Input Shaft 22 Output Shaft 23 Rotating Body 23a Central Shaft 24 Transmission Pin 25 Braking Pin 26 Friction Plate 27 Recess 28 Lock Cam Surface 29 Casing 30 Drive Hole 32 Braking Release Convex 34 Rotating Body 34a Shaft Hole

Claims (3)

[Claims] 1. An output shaft and an input shaft are arranged such that their center lines coincide with each other, and a rotating body at an inner end portion of the output shaft and a rotating body at an inner end portion of the input shaft are axially arranged in a casing. The transmission pins having one end fixed to the rotating body and protruding in the axial direction at each position except two adjacent positions among the positions obtained by dividing the circumference of the end surface of the rotating body into several parts. Is provided, and a braking portion that is fixed to the rotating body and is projected in the axial direction is provided at the remaining two positions. A recess is formed at least at two locations on the inner peripheral edge, and the braking portion is formed on the inner peripheral edge near the open end. A snap ring-shaped friction plate having a lock cam surface with which the braking portion abuts and having a restoring force inward in the radial direction is inscribed at its outer peripheral edge so as to be rotatable with respect to the inner peripheral surface of the casing, The transmission pin and the braking unit are arranged on the inner peripheral side of the friction plate. The rotating body is provided with a required number of drive holes through which the transmission pin and the braking portion of the rotated body are individually inserted, and the inner end surface of the rotating body is located in the concave portion of the friction plate. Two braking releasing projections capable of pushing the edges of the recesses are installed, and the size of the gap between the drive hole and the transmission pin or the braking portion in the circumferential direction is equal to that of the friction plate. It is characterized in that it is formed to be approximately equal to or slightly longer than the circumferential size of the gap portion between the concave portion and the braking release convex portion, and that the casing is locked to a fixed system to stop rotation. And a rotation transmission device capable of rotating the output shaft by the input shaft. 2. The rotary body according to claim 1, wherein one end is fixed to the rotary body and is axially projected at two adjacent two positions among the positions obtained by dividing the circumference of the end face into four. The output shaft is rotated by the input shaft, which is characterized in that two transmission pins are provided, and two braking pins, one end of which is fixed to the rotating body and project in the axial direction, are provided at the remaining two positions. Possible rotation transmission device. 3. A center shaft is provided so as to project at the center position of the end surface of the rotating body according to claim 1 or 2, and the center shaft is fitted into a shaft hole formed in the center portion of the rotating body for rotation. A rotation transmission device capable of rotating an output shaft by an input shaft, which is movably supported.