JPH0532656Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a spring clutch device for intermittently transmitting driving force from an input shaft to an output shaft.

[Prior art]

Normally, an electromagnetic clutch or a spring clutch device is used as a control device to intermittently transmit driving force from the input shaft to the output shaft. Since it is relatively compact and inexpensive, its use has rapidly increased.

Above, the conventional spring clutch device, for example,
In the spring clutch device disclosed in Japanese Patent No. 60-49772, the intermittent control of the driving force from the input shaft to the output shaft on the spring clutch body side is performed using a plurality of rotating shafts provided on the clutch control member on the spring clutch body side. This is accomplished by a control lever reciprocating in the axial direction and alternately engaging the regulating member.

That is, to explain in detail with reference to a side sectional view of a conventional spring clutch main body shown in FIG. 2 and a control mechanism for controlling the clutch control member shown in FIG. 2 and a small diameter part 4, an output member 6 is coaxially fixed to the large diameter part 2, and an input element B composed of a gear or the like is integrally fixed to the small diameter part 4. An input member 8 that rotates freely is rotatably mounted.

The output member 6 and the input member 8 are formed with an output boss portion 6a and an input boss portion 8a that extend in directions facing each other, and furthermore, both the boss portions 6a, 8
a is formed to have substantially the same diameter, and a series of coil springs 10 are wound around both the boss parts 6a and 8a, and one end 10a of the coil spring 10 is wound around the output member 6, and The other end 10b is engaged with a clutch control member 12, which will be described in detail later.

The clutch control member 12 is connected to the coil spring 1.
Rotation regulating members 12a, 12a, 12a, 12b, 12a, 12a, 12b, 12a, 12b, 12b, 12a, 12a, 12b, 12a, 12a, 12b, 12a, 12b, 12b, 12a, 12a, 12a, 12b, 12a, 12a, 12a, and 12a, 12a, 12a, 12a, 12a, ?
12b is formed, and a control lever C operated by a known solenoid or the like is configured to alternately engage with each of the rotation regulating members 12a and 12b.

Thus, the control lever C is rotated by the rotation regulating member 12.
a, 12b, the coil spring 10 wound between the input boss portion 8a of the input member 8 and the output boss portion 6a of the output member 6 contracts. Both boss parts 6a,
8a is integrated, and when the control lever C is engaged with either of the rotation regulating members 12a, 12b, the coil spring 10 is wound between the bosses 6a, 8a. Both boss portions 6a, 8a are separated by the expansion, and as a result,
The rotational driving force from the input element B is intermittently transmitted to the output element A.

[Problem that the invention attempts to solve]

However, in the conventional spring clutch device described above, the control lever C is driven to swing in the axial direction of the clutch control member 12, and the tip of the control lever C and the contact surface 12c or 12c of the rotation regulating member 12a or 12b. 12d, the frictional force generated between the abutment surface 12c or 12d and the tip of the control lever C causes the clutch control member 12 to close by an amount corresponding to the assembly gap in the spring clutch device. Only this clutch control member 1
This results in a shift in the direction of the axis of 2. This means that
This is one of the causes of lowering the control accuracy of the spring clutch device.

Therefore, the present invention was devised in view of the above circumstances, and when the control lever C is engaged or disengaged from the rotation regulating member 12a or 12b of the clutch control member 12, the clutch control member 12 is moved in the axial direction. It is an object of the present invention to provide a spring clutch device capable of intermittently transmitting driving force from an input member 8 to an output member 6 with high precision without causing the clutch to shift.

[Means for solving problems]

In order to achieve the above object, the main means adopted by the present invention is to provide a system between an input member and an output member that are arranged on the same axis and can rotate independently of each other. Winding a coil spring and engaging and disengaging a rotation regulating member of a clutch control member that controls contraction or expansion of the coil spring,
In a spring clutch device equipped with a control lever that controls on/off of a driving force intermittently transmitted from an input member to an output member, the plurality of rotation regulating members are arranged in the circumferential direction and radial direction on the outer peripheral surface of the clutch control member. The control lever is provided so as to be displaceable in a direction perpendicular to the rotation axis of the clutch control member, and selectively displaced to a position corresponding to each of the rotation control members. This is a spring clutch device in which the spring clutch is adapted to be engaged with and disengaged from each of the rotation regulating members.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples embodying the present invention will be described below with reference to the accompanying drawings to provide an understanding of the present invention.

It should be noted that the following example is an example embodying the present invention, and is not intended to limit the technical scope of the present invention.

Here, Fig. 1 a, b, and c show a spring clutch device according to an embodiment of the present invention, in which Fig. 1 a is a perspective view, Fig. 1 b is a side view, and Fig. 1 c is a front view. It is.

Also, the same reference numerals will be used to describe the same elements as those of the conventional spring clutch device shown in FIGS. 2 and 3.

The spring clutch device D according to this embodiment has a first
As shown in Figures a, b, and c, the basic structure is almost the same as that of the conventional spring clutch device.

In the spring clutch device D, a convex rotation regulating member 13 and an L-shaped rotation regulating member 14 are provided on the outer circumferential surface of the clutch control member 12 at different mounting positions in the radial direction.
Contact surfaces 13a and 14a (restriction portions) that are integrally formed at the end portions of the rotation restriction members 13 and 14 and capable of engaging with the end portions of the control lever 15 are as follows:
They are provided differently in the circumferential direction and the radial direction on the outer peripheral surface of the clutch control member 12. The contact surface 1 of the rotation regulating member 14 is
A stopper 14b is integrally formed on 4a.

The control lever 15 is disposed so as to be displaceable in a direction perpendicular to the rotation axis 12e of the clutch control member 12, and is driven to swing in the direction of arrow 17a or 17b by a solenoid 16.
Therefore, the tip of the control lever 15 is selectively displaced and driven to a position corresponding to the abutting surface 13a of the rotation regulating member 13 or the abutting surface 14a of the rotation regulating member 14. or 1
It can be engaged and detached from 4a.

The spring clutch device D is constructed as described above.

Next, the operation of the spring clutch device D will be explained with reference to FIGS. 1a and 1b and FIG. 2.

The tip of the control lever 15 is the clutch control member 1
When not engaged with either the abutting surface 13a of the rotation regulating member 13 of No. 2 or the abutting surface 14a of the rotation regulating member 14, the input boss portion 8a of the input member 8 integrally configured with the input element B The input member 8 and the output member 6 are integrated by contracting the inner diameter of the coil spring 10 wound between the output boss portions 6a of the output member 6 that is integrally formed with the output element A. The driving force input from input element B is transmitted to output element A. At this time, the coil spring 1
The clutch control member 12, to which the other end 10b of the clutch control member 12 is locked, rotates in the same direction as the input element B and the output element A without being restrained from the outside.

On the other hand, the control lever 15 is driven to swing by the solenoid 16, and the tip of the control lever 15 engages with either the contact surface 13a of the rotation restriction member 13 or the contact surface 14a of the rotation restriction member 14. When the clutch control member 12 is prevented from rotating, the inner diameter of the coil spring 10 expands and the input member 8 and output member 6 are separated. As a result, the driving force input from input element B is not transmitted to output element A.

In this way, the driving force from the input element B is increased by alternately repeating engagement and disengagement of the tip of the control lever 15 with the contact surface 13a of the rotation restriction member 13 or the contact surface 14a of the rotation restriction member 14. It will be transmitted to output element A intermittently.

At this time, the control lever 15 is displaced and driven in a direction perpendicular to the rotation axis 12e of the clutch control member 12, so that the clutch control member 12 has a contact surface between the tip of the control lever 15 and the rotation regulating member 13. 13a or when the rotation regulating member 14 is engaged with and disengaged from the contact 14a, there is no deviation in the direction of the rotation axis 12e.

In this embodiment, a configuration in which two rotation regulating members are provided is shown, but it goes without saying that two or more rotation regulating members may be used.

[Effect of idea]

As described above, the present invention winds a coil spring between an input member and an output member that are arranged on the same axis and can rotate independently of each other, and the coil spring can be contracted or expanded. In a spring clutch device comprising a control lever that engages and disengages from a rotation regulating member of a clutch control member to be controlled to control on/off of the driving force that is intermittently transmitted from the input member to the output member, the plurality of rotation regulating members are provided. are provided on the outer peripheral surface of the clutch control member with their regulating portions being positioned differently in the circumferential and radial directions, and the control lever is provided so as to be displaceable in a direction perpendicular to the rotational axis of the clutch control member, Since the spring clutch device is characterized in that the clutch is selectively displaced to a position corresponding to each rotation restriction member and is engaged with and disengaged from each rotation restriction member, the rotation of the control lever and the clutch control member is restricted. When engaging and disengaging from the member, the clutch control member does not shift in the direction of this axis of rotation. Therefore, in the spring clutch device according to the present invention, the driving force can be transmitted intermittently from the input member to the output member with high precision.

[Brief explanation of the drawing]

Figures 1a, b, and c show a spring clutch device according to an embodiment of the present invention, in which figure a is a perspective view, figure b is a side view, figure c is a front view, and figure 1c is a front view. This figure is a side sectional view of the main body of the conventional spring clutch device, and FIG. 3 is a front view showing the engagement and disengagement mechanism between the control lever and the clutch control member in the conventional spring clutch device. Explanation of symbols, 6... Output member, 6a... Output boss part, 8... Input member, 8a... Input boss part, 1
0...Coil spring, 12...Clutch control member,
12e...Rotation axis core, 13, 14...Rotation regulating member, 13a, 14a...Abutting surface (regulating part), 15
...Control lever, D...Spring clutch device.

Claims (1)

[Claims for Utility Model Registration] A coil spring is wound between an input member and an output member that are arranged on the same axis and can rotate independently of each other, and the contraction or expansion of the coil spring is controlled. A spring clutch device comprising a control lever that engages and disengages a rotation regulating member of a clutch control member to control on/off of a driving force that is intermittently transmitted from an input member to an output member, wherein a plurality of the rotation regulating members are connected to and disengaged from each other. The regulating portions are provided at different positions in the circumferential direction and the radial direction on the outer peripheral surface of the clutch control member, and the control lever is provided so as to be displaceable in a direction perpendicular to the rotation axis of the clutch control member, and each of the above A spring clutch device characterized in that the spring clutch device is adapted to be selectively displaced to a position corresponding to a rotation regulating member and to be engaged with and disengaged from each rotation regulating member.