JPH07139609A - Pulley and drive force transmission device using it - Google Patents

Abstract

PURPOSE:To make the device in the title thin and also restrain the fall down of a rotor by forming a tooth mark for meshing with a gear on one side of a slant part on which a groove is formed. CONSTITUTION:A tooth mark 8 for meshing with a gear is formed on one side slant part 7 on which a V groove 2 is formed. Namely, a tooth mark 8 for meshing with the other gear with a prescribed pitch along the outside of a rotor 3 is formed on one side slant part 7 out of the slant parts 7, 9 on both side parts of the V groove 2. Namely, a gear is formed. By integrating the tooth mark 8 with a pulley as started above, the rotation from a prime mover shaft is transmitted to the rotor 3 through a drive force transmission belt 1 and that rotation is transmitted to another gear by the tooth mark 8 formed on the rotor 3. Accordingly, the power transmission passage with so- called two system in/output are installed together. Therefore, this pulley can function input/output mechanisms by one part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention 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]

2. Description of the Related Art For example, as a method for transmitting the rotation of a driving shaft to a driven shaft, a pair of pulleys (belt wheels) have been used for a long time.
There is a belt transmission mechanism that spans a looped belt and transmits rotation from one to the other. Normally, a pulley has only a function as a pulley, but it has been proposed that the pulley has a so-called two-system input / output power transmission system path in which gears are integrated.

As a pulley having two input / output power transmission paths, for example, as shown in FIGS. 6 and 7, a rotary member 102 having a V-shaped groove 101 on which a belt can be wound is formed on the outer peripheral surface. It is proposed that the gear 103 is integrated on the same axis.

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 the outer peripheral surface of the rotating body so as to fit the belt. The V-shaped groove 101 has a groove shape suitable for a belt,
Its cross-sectional shape is substantially V-shaped.

On the other hand, the gear 103 is provided integrally with the rotating body 102 at the center of the rotating body 102. That is, the gear 103 is integrated with the center of the rotating body 102 so as to project from the rotating body 102.

[0006]

By the way, the above-mentioned gear 1
Since the pulley in which 03 is integrated has both functions by making the pulley portion and the gear portion stepwise different in the thickness direction, the thickness is inevitably limited.

Therefore, such a pulley cannot be applied to, for example, a portable tape cassette recorder or the like, which is required to be thin.

Further, the position F _{1 of} the point of action of the force in the thickness direction,
Since F ₂ is different, the moment around point O generated in the rotating body 102 becomes large, and the rotating body 102 easily falls. As a result, inconvenience arises in that the meshing of the gears is hindered, and the rotation from the driving shaft to the driven shaft is not properly transmitted.

Further, the belt transmission force of the pulley portion is increased by
This can be done by adjusting the belt wrap angle, surface friction coefficient, bite angle and belt tension, but it is currently difficult due to shape (space) restrictions and performance (current consumption increase, etc.) restrictions. .

Therefore, the present invention has been proposed in order to solve the above-mentioned conventional technical problems, and it is possible to make the device thinner, and a highly reliable pulley capable of suppressing the tilting of the rotating body and the pulley. An object is to provide a driving force transmission device used.

[0011]

According to the present invention, in a pulley having a groove on which a driving force transmission belt is hooked, at least one of inclined portions in which the groove is formed is formed with a tooth profile that meshes with a gear. Solve the problem of.

Further, in the driving force transmission device according to the present invention, a driving force transmission belt is hung between the pulley and the motor according to the first aspect, and a gear is meshed with the tooth profile provided on the pulley. The above problem is solved by transmitting the driving force to the gear.

[0013]

In the pulley according to the present invention, since at least one of the inclined portions of the groove on which the driving force transmission belt is hooked has the tooth profile that meshes with the gear, there is no protrusion in the thickness direction, It is possible to reduce the thickness of the pulley that is integrated.

Further, the moment around the point O generated in the pulley is reduced, and the inclination of the pulley is suppressed. Therefore, the rotation from the driving shaft to the driven shaft is transmitted without loss.

Further, when such a thin pulley is used in a driving force transmission mechanism of a portable tape cassette recorder or the like, the tape cassette recorder itself can be made thin.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments to which the present invention is applied will be described in detail below with reference to the drawings. In the pulley of this embodiment, as shown in FIGS. 1 and 2, the gear is integrated with the pulley itself so as not to project in the thickness direction,
It has a so-called two-system input / output power transmission path.

The pulley is formed as a rotating body 3 having a V groove 2 on which a driving force transmission belt 1 having a seamless ring shape is hooked. The rotating body 3 is formed as a disk, and has a V groove 2 on the outer peripheral surface thereof on which the driving force transmission belt 1 is applied.

The V groove 2 is an annular groove having a substantially V-shaped cross section corresponding to the shape of the driving force transmission belt 1, and is formed along the outer peripheral surface of the rotating body 3. Also, this V groove 2 is
It is formed as a V-shaped groove whose groove width is gradually narrowed from the outer peripheral side to the inner peripheral side of the rotating body 3.

A circular protrusion 4 is provided at the center of the rotor 3. A circular through hole 5 into which the rotary shaft is inserted is formed at the center of the protruding portion 4. Further, a part of the through hole 5 is formed with a concave key groove 6 for fixing the rotary shaft and the rotary body 3.

Particularly, in the pulley of this embodiment, a tooth profile 8 for engaging with a gear (not shown) is formed on one of the inclined portions 7 where the V groove 2 is formed. That is,
One of the inclined portions 7 and 9 on both sides of the V groove 2
A tooth profile 8 is formed along the outer circumference of the rotating body 3 so as to mesh with another gear at a predetermined pitch. That is, gears are formed.

The tooth profile 8 may be formed not only on the one inclined portion 7 but also on the other inclined portion 9.

By integrating the tooth profile 8 into 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.
It also has a so-called two-system input / output power transmission path for transmitting the rotation to another gear by the tooth profile 8 formed on the rotating body 3. Therefore, this pulley functions as an input mechanism and an output mechanism in one component.

In the pulley of this embodiment, the tooth profile 8 that meshes with another gear is formed on the inclined portion 7 of the V groove 2 so as not to project beyond the thickness of the rotating body 3, so that the thickness is thin and The moment around point O is small, and the inconvenience of falling 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 and the like.

Next, an example in which the pulley is applied to a driving force transmission device of a portable tape cassette recorder which is required to be thin will be described. As shown in FIG. 3, the driving force transmission device includes a capstan wheel 14 that transmits the rotation of the motor 13 to a pair of reel shafts 11 and 12 that are rotatably supported on the chassis substrate 10, and the pulley 1 having the above configuration.
5, 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 any of the intermediate gears 16 and 17.

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. That is, the driving force transmission belt 19 is stretched over the outer peripheral surface of the capstan wheel 14 that is rotatable with respect to the rotation shaft 13a of the motor 13 and the support shaft 14a that is fixed to the chassis substrate 10.

Then, in the midway of the traveling path of the driving force transmission belt 19 hung between the motor 13 and the capstan wheel 14, the rotation of the motor 13 is rotated by the pair of reel shafts 1.
A pulley 15 is provided for transmitting to 1 and 12. The driving force transmission belt 19 is provided in the V groove of the pulley 15.
It is designed to be used. That is, the rotation of the motor 13 is transmitted to the pulley 15 via the driving force transmission belt 19, and the pulley 15 is rotated by the rotational force of the driving force transmission belt 19.

Further, the tooth profile integrated with the pulley 15 is rotatably provided on the tip end side of the arm 20 which is rotatable coaxially with the rotation axis of the pulley 15 in the arrow X direction in the drawing. The gear 18 is in mesh with each other.

By rotating the gear 18 in the direction of the arrow X in the drawing, the rotation of the motor 13 is selectively transmitted to one of the reel shafts 11 and 12 via the intermediate gears 16 and 17. Has become.

The intermediate gears 16 and 17 are the reel shafts 11 and 1, respectively.
It is provided between the pulley 2 and the pulley 15 and meshes with a gear (not shown) provided on the reel shafts 11 and 12. The reel shafts 11 and 12 meshing with the intermediate gears 16 and 17 engage 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.

In the driving force transmission device configured as described above, for example, when the arm 20 is tilted to the right side as shown by an arrow A in FIG. 4 and the gear 18 meshes with one intermediate gear 17, the motor 13 The rotation of the drive force transmission belt 19
Is transmitted to the pulley 15, and when the pulley 15 rotates, the gear 18 provided on the arm 20 rotates, and the intermediate gear 17 meshing with the gear 18 rotates one reel shaft 12.

On the contrary, when the arm 20 is tilted to the left side 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 driven by the driving force transmission belt 19 to the pulley 15. To the gear 18 provided on the arm 20 when the pulley 15 rotates.
Rotates, and the intermediate gear 16 meshing with the gear 18 rotates the other reel shaft 11.

In the driving force transmission device configured as described above, the device itself is required to be thin, but by using the thin pulley of the present embodiment, the demand can be satisfied.

In the above example, the pulley according to the present invention is applied to the driving force transmission device of the tape cassette recorder, but the present invention is not limited to this, and the rotation is transmitted from the driving shaft to the driven shaft. It can be applied to driving force transmission devices.

[0034]

As is apparent from the above description, in the pulley according to the present invention, since the tooth profile that meshes with the gear is formed on at least one of the inclined portions of the groove on which the driving force transmission belt is hung, the thickness is reduced. Since there is no protrusion in the direction, the pulley with integrated gears can be made thinner. Further, the moment around the point O generated in the pulley is reduced, the tilt of the pulley is suppressed, and the rotation from the driving shaft to the driven shaft can be efficiently transmitted without loss.

Further, when such a thin pulley is used in a driving force transmission mechanism of a portable tape cassette recorder or the like, the tape cassette recorder itself can be made thin.

[Brief description of 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 in 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 in a driving force transmission device of a tape cassette recorder, and one reel shaft is rotated.

FIG. 5 is a plan view showing an example in which the pulley to which the present invention is applied is used in a driving force transmission device of a tape cassette recorder, and a state in which the other reel shaft is rotated.

FIG. 6 is a perspective view showing a conventional pulley in which gears are integrated with the pulley.

FIG. 7 is an enlarged cross-sectional view of a conventional pulley in which gears are integrated with the pulley.

[Explanation of symbols]

 1, 19 ... Driving force transmission belt 2 ... V groove 3 ... Rotating body 4 ... Projection portion 5 ... Through hole 7, 9 ... Inclined portion 8 ... Tooth profile 11, 12・ ・ ・ Reel shaft 13 ・ ・ ・ Motor 14 ・ ・ ・ Capstan wheel 15 ・ ・ ・ Pulley 16, 17 ・ ・ ・ Intermediate gear 18 ・ ・ ・ Gear 20 ・ ・ ・ Arm

Claims (2)

[Claims] 1. A pulley having a groove on which a driving force transmission belt is applied, wherein a tooth profile that meshes with a gear is formed on at least one of the inclined portions where the groove is formed. 2. A driving force transmission belt is hung between the pulley and the motor according to claim 1, and a gear meshes with a tooth profile provided on the pulley to transmit the driving force of the motor to the gear. And a driving force transmission device.