JP3575036B2 - Pulley and driving force transmission device using the same - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to a pulley in which a gear is integrated with a pulley, and a driving force transmission device using the pulley.
[0002]
[Prior art]
For example, as a method of transmitting the rotation of a driving shaft to a driven shaft, there is a belt transmission mechanism in which an annular belt is stretched between a pair of pulleys (belt wheels) so that rotation is transmitted from one to the other. . Usually, a pulley has only a function as a pulley, but a pulley in which gears are integrated, that is, a so-called two-system input / output power transmission system is proposed.
[0003]
As a pulley having the two input / output power transmission paths, for example, as shown in FIGS. 6 and 7, the pulley is coaxial with a rotating body 102 having a V-groove 101 formed with a belt on the outer peripheral surface. And a gear 103 integrated therewith.
[0004]
The rotating body 102 is formed as a disk, and has a V-shaped groove 101 having a substantially trapezoidal cross section which is applied to an outer peripheral surface of the rotating body 102 so that a belt is fitted. The V-shaped groove 101 has a groove shape suitable for the belt, and has a substantially V-shaped cross section.
[0005]
On the other hand, the gear 103 is provided at the center of the rotating body 102 integrally with the rotating body 102. That is, the gear 103 is integrated with the center of the rotating body 102 so as to protrude from the rotating body 102.
[0006]
[Problems to be solved by the invention]
By the way, the pulley in which the gear 103 is integrated has both functions by making the pulley portion and the gear portion different in the thickness direction, so that the thickness is inevitably limited.
[0007]
Therefore, such a pulley cannot be applied to, for example, a portable tape cassette recorder or the like that requires a reduction in thickness.
[0008]
In addition, since the positions F1 and F2 of the points of action of the force in the thickness direction are different, the moment around the point O generated in the rotating body 102 becomes large, and the rotating body 102 easily falls down. As a result, there is a problem that the meshing of the gears is hindered and the rotation from the driving shaft to the driven shaft is not transmitted well.
[0009]
Further, the belt transmission force of the pulley can be increased by adjusting the belt winding angle, the surface friction coefficient, the penetration angle, and the belt tension of the belt, but the shape (space) is limited and the performance (current consumption is increased) is increased. At present, it is simply difficult due to restrictions.
[0010]
Accordingly, the present invention has been proposed to solve such a conventional technical problem, and it is possible to reduce the thickness of the rotating body, and at the same time, to provide a highly reliable pulley capable of suppressing the falling of the rotating body, and a drive using the pulley. It is an object to provide a force transmission device.
[0011]
[Means for Solving the Problems]
The present invention includes a V-shaped groove on which the driving force transmission belt is applied, and the driving force transmission belt comes into contact with an inclined portion of the V-shaped groove, and a portion of the driving force transmission belt contacting the inclined portion. The above-mentioned object is attained by forming a tooth profile in which at least one of the inclined portions in which the V-shaped groove is formed is meshed with another gear.
[0012]
Further, in the driving force transmission device according to the present invention, the driving force transmission belt includes a V-shaped groove on which the driving force transmission belt is hung, and the driving force transmission belt contacts the inclined portion of the V-shaped groove, and At least one of the inclined portions where the V-shaped groove is formed at the portion where the force transmission belt abuts is formed, and at least one of the inclined portions is formed in a tooth shape that meshes with another gear. The problem described above is solved by transmitting the rotation from the driving force transmission belt, which is transmitted through the force transmission belt and transmitted to the pulley, to another gear meshing with the tooth profile provided on the pulley. .
[0013]
[Action]
In the pulley according to the present invention, at least one of the inclined portions of the V-shaped groove to which the driving force transmission belt is applied and abuts is formed with a tooth profile that meshes with another gear. The transmission force of the belt is increased, the current consumption is reduced, and since there is no protrusion in the thickness direction, the pulley integrated with the gears can be reduced in thickness.
[0014]
Further, the moment around the point O generated on the pulley is reduced, and the pulley can be prevented from falling down. Therefore, the rotation from the driving shaft to the driven shaft is transmitted without loss.
[0015]
When such a thin pulley is used for a driving force transmission mechanism of a portable tape cassette recorder or the like, the tape cassette recorder itself can be made thinner.
[0016]
【Example】
Hereinafter, specific embodiments to which the present invention is applied will be described in detail with reference to the drawings. As shown in FIGS. 1 and 2, the pulley of this embodiment has a so-called two-system input / output power transmission path in which the gear is integrated with the pulley itself without projecting in the thickness direction. Things.
[0017]
The pulley is formed as a rotating body 3 having a V-shaped groove 2 on which a driving force transmission belt 1 having a seamless annular shape is applied. The rotating body 3 is formed as a disk, and has a V-groove 2 on the outer peripheral surface of which the driving force transmission belt 1 is applied.
[0018]
The V groove 2 is formed along the outer peripheral surface of the rotating body 3 as an annular groove having a substantially V-shaped cross section according to the shape of the driving force transmission belt 1. The V-shaped groove 2 is formed as a V-shaped groove in which the groove width is gradually reduced from the outer peripheral side to the inner peripheral side of the rotating body 3.
[0019]
Further, a protruding portion 4 that protrudes in a circular shape is provided at a center position of the rotating body 3. A circular through hole 5 into which the rotating shaft is inserted is formed at the center of the protrusion 4. Further, a part of the through hole 5 is formed with a concave key groove 6 for fixing the rotating shaft and the rotating body 3.
[0020]
In particular, in the pulley of this embodiment, a tooth profile 8 for meshing with a gear (not shown) is formed on one inclined portion 7 where the V groove 2 is formed. That is, on one of the inclined portions 7, 9 on both sides of the V-groove 2, a tooth profile 8 that meshes with another gear at a predetermined pitch is formed along the outer periphery of the rotating body 3. That is, a gear is formed.
[0021]
In addition, the tooth profile 8 may be formed not only on one inclined portion 7 but also on the other inclined portion 9.
[0022]
By integrating the tooth profile 8 with the pulley as described above, in the pulley of this embodiment, the rotation from the driving shaft is transmitted to the rotating body 3 via the driving force transmission belt 1, and the rotation is transmitted to the rotating body 3. It also has a so-called two-system input / output power transmission path that transmits to other gears by the formed tooth profile 8. Therefore, this pulley functions the input mechanism and the output mechanism with one component.
[0023]
In the pulley of this embodiment, the tooth profile 8 meshing with the other gears is formed in the inclined portion 7 of the V-groove 2 so as not to protrude beyond the thickness of the rotating body 3, so that the thickness is small and the point O And the inconvenience of falling down during rotation is avoided. Further, the belt transmission force is increased, and the current consumption can be reduced by weakening the tension of the belt or the like.
[0024]
Next, an example will be described in which the pulley is applied to a driving force transmission device of a portable tape cassette recorder that requires a reduction in thickness. As shown in FIG. 3, the driving force transmission device includes a capstan wheel 14 that transmits rotation of a motor 13 to a pair of reel shafts 11 and 12 rotatably supported on a chassis substrate 10, and a pulley 15 having the above configuration. And a pair of intermediate gears 16 and 17 that mesh with the reel shafts 11 and 12, and a gear 18 that selectively meshes with one of the intermediate gears 16 and 17.
[0025]
An annular driving force transmission belt 19 for transmitting the rotation of the motor 13 to the capstan wheel 14 is provided between the motor 13 and the capstan wheel 14. In other words, the driving force transmission belt 19 extends around the outer peripheral surface of the capstan wheel 14 which is rotatable with respect to the rotation shaft 13a of the motor 13 and the support shaft 14a fixed to the chassis substrate 10.
[0026]
A pulley 15 for transmitting the rotation of the motor 13 to the pair of reel shafts 11 and 12 is provided in the middle of the traveling path of the driving force transmission belt 19 applied between the motor 13 and the capstan wheel 14. . A driving force transmission belt 19 is applied to the V groove of the pulley 15. That is, the rotation of the motor 13 is transmitted to the pulley 15 via the driving force transmission belt 19, and the rotation of the driving force transmission belt 19 causes the pulley 15 to rotate.
[0027]
Further, the tooth profile integrated with the pulley 15 has a gear 18 rotatably provided on the distal end side of an arm 20 which is rotatable in the direction of arrow X in the drawing coaxially with the rotation axis of the pulley 15. Are to be engaged.
[0028]
The gear 18 is configured to selectively transmit the rotation of the motor 13 to one of the reel shafts 11 and 12 via the intermediate gears 16 and 17 by rotating in the direction of arrow X in the drawing. .
[0029]
The intermediate gears 16, 17 are provided between the reel shafts 11, 12 and the pulley 15, and mesh with gears (not shown) provided on the reel shafts 11, 12. The reel shafts 11 and 12 meshing with the intermediate gears 16 and 17 are engaged with the reel hubs when the tape cassette is mounted, and rotate these reel hubs to wind the magnetic tape from one reel hub to the other reel hub. It has become.
[0030]
In the driving force transmission device configured as described above, for example, when the arm 20 is tilted rightward as shown by the arrow A in FIG. 4 and the gear 18 meshes with one of the intermediate gears 17, the rotation of the motor 13 is stopped. The power is transmitted to the pulley 15 by the driving force transmission belt 19, and the rotation of the pulley 15 causes the gear 18 provided on the arm 20 to rotate, and the intermediate gear 17 meshing with the gear 18 rotates one of the reel shafts 12.
[0031]
Conversely, when the arm 20 is tilted leftward as shown by the arrow B in FIG. 5 and the gear 18 meshes with the other intermediate gear 16, the rotation of the motor 13 is transmitted to the pulley 15 by the driving force transmission belt 19. When the pulley 15 rotates, the gear 18 provided on the arm 20 rotates, and the other reel shaft 11 rotates by the intermediate gear 16 meshing with the gear 18.
[0032]
In the driving force transmission device configured as described above, the thickness of the device itself is required to be reduced, but the requirement can be satisfied by using the thin pulley shown in the present embodiment.
[0033]
In the above-described example, the pulley according to the present invention is applied to the driving force transmitting device of the tape cassette recorder. However, the present invention is not limited to this, and the driving force transmitting device transmits rotation from the driving shaft to the driven shaft. Applicable to equipment.
[0034]
【The invention's effect】
As is clear from the above description, in the pulley according to the present invention, at least one of the inclined portions in which the V-shaped groove is formed to be in contact with the driving force transmission belt has a tooth shape that meshes with another gear. Since the belt is in contact with the tooth profile, the transmission force of the belt in the pulley part is increased, current consumption is reduced, and there is no protrusion in the thickness direction, so the gears are integrated. The thinned pulley can be reduced. In addition, the moment around the point O generated in the pulley is reduced, the falling of the pulley is suppressed, and the rotation can be efficiently transmitted from the driving shaft to the driven shaft without loss.
[0035]
When such a thin pulley is used for a driving force transmission mechanism of a portable tape cassette recorder or the like, the tape cassette recorder itself can be made thinner.
[Brief description of the drawings]
FIG. 1 is a perspective view of a pulley to which the present invention is applied.
FIG. 2 is an enlarged sectional view of a main part of a pulley to which the present invention is applied.
FIG. 3 is a plan view showing an example in which a pulley to which the present invention is applied is used for a driving force transmission device of a tape cassette recorder.
FIG. 4 is a plan view showing an example in which a pulley to which the present invention is applied is used for a driving force transmission device of a tape cassette recorder, in which one reel shaft is rotated.
FIG. 5 is a plan view showing an example in which a pulley to which the present invention is applied is used for a driving force transmission device of a tape cassette recorder, in which the other reel shaft is rotated.
FIG. 6 is a perspective view showing a conventional pulley in which a gear is integrated with a pulley.
FIG. 7 is an enlarged sectional view of a conventional pulley in which a gear is integrated with the pulley.
[Explanation of symbols]
1, 19 ... driving force transmission belt 2 ... V groove 3 ... rotating body 4 ... protruding portion 5 ... through hole 7, 9 ... inclined portion 8 ... tooth shape 11, 12 ... Reel shaft 13 ... Motor 14 ... Capstan wheel 15 ... Pulleys 16 and 17 ... Intermediate gear 18 ... Gear 20 ... Arm

Claims (2)

E Bei grooves V-shaped drive power transmission belt is applied, together with the driving force transmitting belt to the inclined portion of the V-shaped groove is in contact, the V-shaped portion the driving force transmitting belt abuts A pulley , wherein at least one of the inclined portions in which the groove is formed is formed in a tooth shape that meshes with another gear . A V-shaped groove on which the driving force transmission belt is applied, wherein the driving force transmission belt contacts the inclined portion of the V-shaped groove, and a portion of the V-shaped groove contacting the driving force transmission belt. the pulley at least one inclined portion of the inclined portion is formed in a tooth profile that meshes with the other gear grooves are formed, the rotation of the driving shaft is transmitted through the driving force transmission belt, transmitted to the pulley A driving force transmission device, wherein the rotation from the driving force transmission belt is transmitted to another gear meshing with the tooth profile provided on the pulley.

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