JPH0619863Y2 - Spring clutch device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field) The present invention relates to a spring clutch device for intermittently transmitting drive transmission from an input shaft to an output shaft.

(Prior Art) Generally, an electromagnetic clutch, a spring clutch device, or the like is used as a control device for intermittently outputting drive transmission from an input shaft to an output shaft.
Since the spring clutch device is more compact and cheaper than the electromagnetic clutch device, its frequency of use has rapidly increased.

The above-mentioned conventional spring clutch device, for example, Japanese Patent Publication No. 60
In the spring clutch device disclosed in Japanese Utility Model Publication No. 49772 or Japanese Utility Model Laid-Open No. 59-160923, the intermittent control of the drive transmission force from the input shaft on the spring clutch body side to the output shaft is controlled by the clutch control on the spring clutch body side. The control lever reciprocates in the axial direction and is alternately locked to the rotation regulating member provided on the member,
It is configured to perform on / off control of the spring clutch.

That is, referring to the sectional view of the spring clutch body shown in FIG. 3 and the control mechanism for controlling the clutch control member shown in FIG. 4, the output element (A) will have a large diameter portion ( 2) and a small diameter portion (4) as an on-axis member, an output member (6) is coaxially fixed to the large diameter portion (2), and a gear or the like is attached to the small diameter portion (4). (8) which rotates integrally with the input element (B) composed of
Is rotatably mounted.

The output member (6) and the input member (8) have an output boss portion (6a) and an input boss portion (8) extending in directions opposite to each other.
a) is formed, the bosses (6a) and (8a) are formed to have substantially the same diameter, and the bosses (6a) and (8a) have a series of coils extending between the bosses. The spring (10) is wound and its one end (1
0a) is engaged with the output member (6) and the other end (10b) is engaged with the clutch control member (12) which will be described later in detail.

The clutch control member (12) is mounted loosely on the outer periphery of the coil spring (10), and the clutch control member (1)
Rotation regulating members (12a) and (12b) are formed on the outer periphery of 2) at positions separated by a predetermined distance in the axial direction, and a control lever (C) operated by a solenoid or the like known per se is The rotation restricting members (12a) and (12b) are alternately engaged with each other.

Thus, the control lever (C) causes the rotation restricting members (12a) (12)
In a state in which it is not locked to any of b), the rotational driving force from the input element (B) is applied to the input boss portion (8a) of the input member (8) and the output boss portion (6a) of the output member (6). The bosses (6a) ((8a) are integrated by contraction of the coil spring (10) wound between them, and the control lever (C) is rotated by the rotation restricting members (12a) (12b). ), The driving force from the input element (B) is applied to the coil spring (10) wound around both the boss members (6a) and (8a). )
By expanding, both boss parts (6a) (8a) will be separated,
As a result, the rotational driving force from the input element (B) is intermittently output to the output element (A).

(Problems to be Solved by the Invention) However, the above-described conventional spring clutch device has the following serious drawbacks and problems. That is, as can be easily understood from FIG. 4, one rotation regulating member (12a) formed on the clutch control member (12).
The tip of the control lever (C) comes into contact with the contact surface (12c) of the arrow C, and the arrow D direction (counterclockwise direction) when viewed from the right end direction of the shaft center.
From the state in which the rotation of the clutch control member (12) is blocked to the right of the shaft center, the sliding surface of one rotation restriction member (12a)
When separated from (12c) and locked to the sliding surface (12d) of the other rotation restricting member (12b), the suction force for releasing the control lever (C) from the rotation restricting member (12a) is applied. f, and the rotation restricting members (12a) (12b) of the clutch control member (12) by the drive transmission force of the input element (B).
Let F be the force acting on the control lever (C) and the friction coefficient between the sliding surfaces (12c) and (12d) of the control lever (C) and the rotation restricting members (12a) and (12b) is μ, Force F on sliding surface (12c) (12d)
When the reaction force of R is R, the control lever (C) moves the sliding surface (1) of the rotation restricting members (12a) (12b).
2c) The suction force f to be released from (12d) is f = μ
It becomes R.

However, when the force f to be swung by the suction force of the solenoid or the like exceeds a certain level, when the control lever engages and disengages with the rotation restricting members (12a) and (12b) of the clutch control member (12), the suction means such as the solenoid is Problems such as noise are generated.

(Means for Solving the Problems) The present invention occurs when the control lever (C) is disengaged from the rotation restricting members (12a) and (12b) of the clutch control member (12). The present invention provides a spring clutch device capable of reducing noise and engaging and disengaging the control lever (C) with a smaller suction force. Therefore, the spring clutch device of the present invention operates independently of each other. A coil spring is wound between an input boss portion of a movable input member and an output boss portion of an output member, and is disengaged from a rotation restricting member of a clutch control member for controlling contraction or expansion of the coil spring from an input element. In a spring clutch device including a control lever for intermittently transmitting the drive of the clutch to the output element, the control lever swings in the axial direction of the clutch control member to engage with and disengage from the rotation control member. , That time Those comprising a tapered surface inclined at a predetermined angle with respect to the moving direction of the control lever the sliding surface between the control lever of the regulating member.

(Operation) According to the above configuration, when the control lever (C) engages with and disengages from the rotation restricting members (14a) (14b) formed on the clutch control member (14), the control lever (C) operates. Rotation restriction member (14a)
The sliding surface (14c) of (14b) slides along the taper of (14d) to engage and disengage. Therefore, the locking of the control lever (C) to the sliding surfaces (14c) and (14d) or the release from the sliding surfaces (14c) and (14d) is smoothly performed.

(Embodiment) A detailed explanation will be given below with reference to FIG. 1 showing rotation restricting members (14a), (14b) of a clutch control member (14) which is an embodiment of the present invention. It should be noted that the same members described below will be described by using the same numbers.

On the outer circumference of the clutch control member (14) and at positions separated by a predetermined distance in the axial direction, rotation restricting members (14a) and (14b) are formed to project, and one rotation restricting member (14a ) And the other rotation restricting member (14b) are arranged at positions separated by approximately 180 degrees in the outer peripheral direction.

Further, the sliding surfaces (14c) (14d) of the rotation restricting members (14a) and (14b) with the control lever (C) are the same as the clutch control member (14).
It is formed as a tapered surface inclined by a predetermined angle (θ ₁ ) with respect to the axis line of. That is, on the sliding surfaces (14c) and (14d) of the rotation restricting members (14a) and (14b), the control lever (C) has an axis (P).
As it moves in the direction, it is inclined in the direction away from it. At this time, the control lever (C) is moved to the rotation regulating members (14a) (14
suction force f ₁ required to separate from the sliding surface (14c) (14d) of b)
Is a force acting on the rotation restricting members (14a) and (14b) of the clutch control member (14) by the drive transmission force of the input element (B), and the control lever (C) and the rotation restricting members (14a) and (14b). ), The friction coefficient between the sliding surfaces (14c) and (14d) is μ, and the rotation restriction members (14a) (14
When the reaction force of the force F generated on the sliding surfaces (14c) and (14d) of b) is R and the respective component forces of the reaction force R are R ₁ and R ₂ , f ₁ = μR ₁ −R ₂ = μR _cos θ ₁ −R _sin θ ₁ = R (μ _cos θ _{1 −sin} θ ₁ ).

Thus, as can be easily understood from FIGS. 4 to 1 described above, the suction force required to separate the control lever (C) from the sliding surface of the rotation restricting member is the same as the conventional suction force. f
= ΜR, the suction force f ₁ = R (μ _COS θ according to the present invention
It can be seen that ₁ - _SIN θ ₁ ) is significantly reduced.

The operation of the present invention will be described below.

With reference to FIG. 3 to FIG. 1, the drive input from the input element (B) is driven by the input boss portion (8a) of the input member (8) integrally formed with the input element (B). , Both members (6) by contracting the inner diameter of the coil spring (10) wound between the output boss portions (6a) of the output member (6) integrally formed with the output element (A) (8) is integrated, and the driving force is transmitted to the output element (A). At this time, the coil spring
The clutch control member (14) to which the other end (10b) of (10) is locked is not restricted from the outside, and therefore the clutch control member (1
4) also rotates in the same direction as the input element (B) rotates. However, the rotation control member (14) of the clutch control member (14) is
When the control lever (C) is locked to any of (a) to (14b) to prevent the clutch control member (14) from rotating, the coil spring (1)
The inner diameter of 0) is expanded, and the driving force from the input element (B) is not output to the output element (A).

Thus, the control lever (C) alternately engages and disengages the rotation restricting members (14a) to (14b) so that the drive from the input element (B) is intermittently transmitted to the output element (A). Will be.

At this time, the sliding surfaces (14c) and (14d) of the rotation restricting members (14a) and (14b) formed on the outer periphery of the clutch control member (14) have a predetermined angle (θ
₁ ) Since it is formed as an inclined taper, the control lever (C) can be easily detached from the sliding surfaces (14c) and (14d) with a light suction force as described above, and the capacity of the control lever (C) is smaller than that of the conventional one. A small solenoid or the like can be applied, and noise is also greatly reduced.

The inclination angle (θ ₁ ) of the sliding surfaces (14c) and (14d) with respect to the axis (P) can theoretically be applied in the range of 0 ° <θ ₁ <90 °, but it is practically applicable. Is 5 degrees ≤ θ ₁ ≤ 60 degrees, more preferably 10 degrees ≤ θ ₁ ≤ 35 degrees.

Further, although the rotation restricting member formed on the outer circumference of the clutch control member has been described as a specific example in the present embodiment, the present invention is not limited to this, and the drive from the input element is intermittently applied to the output element. As long as it is a rotation restricting member for controlling when outputting to, the rotation restricting member provided at any position, for example, the rotation restricting member formed on the side surface (end surface) instead of the outer periphery of the clutch control member Applicable.
Further, in this embodiment, the structure in which the two rotation restricting members are provided is shown, but it goes without saying that one or more than two rotation restricting members can be applied.

(Effects of the Invention) As described above, according to the present invention, the coil spring is wound between the input boss portion of the input member and the output boss portion of the output member, which are rotatable independently of each other. Of a clutch control member for controlling the reduction or expansion of the clutch, the spring clutch device including a control lever for intermittently outputting a drive from an input element to an output element by engaging with a rotation restriction member of the clutch control member, wherein the clutch control member is formed. Since the sliding surface of the rotation restricting member is formed as a tapered surface inclined by a predetermined angle with respect to the moving direction of the control lever, the control lever can be easily detached from the sliding surface with a light suction force, and It is very practical because it has an advantage that a suction means (control lever actuating means) such as a solenoid having a smaller capacity than that of the prior art can be applied, and noise is also greatly reduced.

[Brief description of drawings]

1 and 2 are a front view and a side view showing a mechanism for engaging and disengaging a clutch control member with a control lever according to the present invention, FIG. 3 is a sectional view of a spring clutch device, and FIG. 4 is conventional. FIG. 6 is a front view showing an engagement / disengagement mechanism between a control lever and a clutch control member. 6 ... Output member, 6a ... Output boss, 8 ... Input member, 8a ... Input boss, 10 ... Coil spring, 14 ... Clutch control member, 14a, 14b ... Rotation restriction member, 14c, 14d …… Sliding surface, A …… Output element, B …… Input element

Claims (2)

[Scope of utility model registration request] 1. A clutch control member for winding a coil spring between an input boss portion of an input member and an output boss portion of an output member, which are rotatable independently of each other, and controlling contraction or expansion of the coil spring. In a spring clutch device provided with a control lever that is disengaged from a rotation restricting member and intermittently outputs drive from an input element to an output element, the control lever swinging in the axial direction of the clutch control member. And the sliding surface of the rotation restricting member with respect to the control lever is formed as a tapered surface inclined by a predetermined angle with respect to the moving direction of the control lever. A spring clutch device. 2. The inclination angle θ1 of the sliding surface is 10 degrees ≦ θ1
The spring clutch device according to claim 1, characterized in that the spring clutch device is set in a range of ≤35 degrees.