JPH0724667Y2 - Clutch device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Purpose of Invention] <Industrial Application Field> The present invention selectively transmits a rotational force between an input side and an output side rotating member which are relatively rotatable and coaxial with each other. The invention relates to a clutch device.

<Prior Art> Conventionally, various clutch devices have been proposed for selectively transmitting a rotational force between an input side and an output rotating member that are relatively rotatable with respect to each other. For example, in Japanese Patent Laid-Open No. 59-175633, an armature is provided on a rotor fixedly mounted on a rotating shaft so as to come into contact with and separate from the rotor in the axial direction. There is disclosed a structure in which a clutch spring is wound between itself and a portion, and the winding force of the clutch spring is controlled by the movement of the armature to control the transmission of the rotational force.

According to the above structure, it is possible to control the transmission of the rotational force without stopping the rotation of the input gear. However, since the clutch spring is used, the number of parts is relatively large and the number of assembling steps is also large, so that there is a problem that the manufacturing cost rises. Also, if the clutch is disengaged during high-speed rotation, frictional heat is generated when the boss and the clutch spring slide, and the outer peripheral surface of the boss easily wears. It was unsuitable to use the clutch mechanism having the above-mentioned structure in the device for carrying out.

<Problems to be Solved by the Invention> In view of such problems of the conventional technology, the main purpose of the present invention is to reduce the manufacturing cost because the number of parts is small and the assembly is easy, and at the time of high speed rotation. It is to provide a clutch device suitable for engaging and disengaging the clutch in the clutch.

[Structure of the Invention] <Means for Solving the Problems> According to the present invention, the object is to have an input side and an output side rotating member that are relatively rotatable and coaxial with each other, and A clutch device for selectively transmitting a rotational force between members, comprising a movable member supported by either one of the rotating members so as to be able to transmit the rotational force and movably in an axial direction, and A pair of ratchet teeth, which are provided to face each other on the other of the rotating member and the movable member and are engaged with each other, and a solenoid for selectively driving the movable member to engage the ratchet teeth with each other. Means, the solenoid means is formed so as to surround the movable member, an annular core provided coaxially with the rotating members, an exciting coil wound around the annular core, and The ring An armature supported on the outer side in the radial direction of the annular core so as to be capable of tilting in a direction of approaching and separating from the end face of a. In order to reciprocate the movable member in the axial direction by the tilting motion of the armature, the movable member is rotatable relative to the movable member on the side opposite to the supported portion of the armature via the movable member. And an engaging claw that engages in the axial direction is formed. In particular, a sleeve portion formed at an axial end portion of the other rotating member so as to rotatably support one of the both rotating members, and a cut portion axially cut into the sleeve portion, By fitting in the sleeve part,
It is preferable to have a thrust receiving member that has a protrusion that is recessed in the cut portion and that receives the thrust force of the rotating member.

<Operation> In this way, by tilting the armature by the solenoid means to actuate the movable member, both ratchet teeth are engaged and disengaged, and a rotational force is selected between both rotating members via the movable member. Can be transmitted. Further, by providing an engaging claw capable of engaging with the movable member of the armature supported so as to be tiltable on the side opposite to the portion supported through the movable member, a small tilt angle of the armature can be obtained at its working end. A large amount of movement of a certain engaging claw can be secured. Further, by providing a sleeve portion having a notch portion in the axial direction on one rotating member, the other rotating member can be easily fitted by making the sleeve portion narrow and the thrust receiving portion is provided at the notch portion. By immersing the protrusion of the member, it is possible to eliminate the circumferential rattling of the sleeve and increase the rigidity of the shaft support.

<Embodiment> Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 and 2 show an electromagnetic clutch to which the present invention is applied. In this electromagnetic clutch 1, a part of the output shaft 2 is partially cut to have a D-shaped cross section,
A driven member 3 as an output side rotation member is fitted.
A locking portion 3a having a shape complementary to the D-shaped cross section is formed in a part of the axial hole of the driven member, and the locking section 3a is engaged with the D-shaped cross section. The output shaft 2 and the driven member 3 are integrated with each other.

The driven member 3 extends from the right end to the left end in FIG.
The right extending portion 4, the large diameter portion 5, the shoulder portion 6 and the left extending portion 7 as a sleeve portion are integrally formed. The extension parts 4 and 7 are formed with expansion heads 4a and 7a protruding outward in the radial direction at their respective axial free ends, and the intermediate parts of the driven member 3 are extended from the expansion parts 4a and 7a. Slits 4 as notches along the axial direction toward
b and 7b are provided. The vicinity of the free end of the right extending portion 4 is pivotally supported by a bearing member 9 coaxially attached to a hole 8a of a support plate 8 made of a magnetic material. Left extension 7
Has an input gear 11 as an input side rotating member and an output shaft 2
It is rotatably fitted coaxially with.

An annular thrust receiving member 10 serving as a thrust bearing of the input gear 11 is sandwiched between the end plate portion 11a of the input gear 11 and the expanding portion 7a of the left extending portion 7, and the thrust receiving member 10
The same number of protrusions 10a that are fitted into the slits 7a of the enlarged head 7a in the axial direction are provided. The thrust receiving member 10 is fitted to the outer peripheral portion of the left-side extending portion 7 such that the left-side extending portion 7 is radially inwardly splayed, and the elastically restored expanded portion 7a of the left-side extending portion 7 is formed. In the slit 7b of the part,
As shown in FIG. 4 as well, by immersing the protrusion 10a, rattling in the circumferential direction due to the slit 7a is eliminated, so that the support rigidity of the left extending portion 7 as the radial bearing portion of the input gear 11 is increased. As a result, the input gear 11 rotates smoothly.

The input gear 11 is coaxially formed with a boss portion 12 extending in a direction facing the shoulder portion 6 described above. This boss part 12
The movable body 13 having a cylindrical shape spline-coupled is fitted around the outer periphery of the. Therefore, the movable body 13 is
11 and the end plate portion 11 of the input gear 11
It can reciprocate in the axial direction between a and the large diameter portion 5 of the driven member 3.

An annular core 14 is coaxially fixed to the hole 8a of the support plate 8, and a coil 16 is wound around the core 14 via a coil bobbin 15. The coil 16 is formed by the outward flange portion 17 formed at the left open end of the core 14 in FIG.
Is retained, and a plate-shaped armature 18 is arranged so as to face the outward flange portion 17.

The armature 18 has a shape having an opening that surrounds the movable body 13, and has a support portion 19 formed by cutting and raising a portion of the support plate 8 at a substantially right angle on one end side in the longitudinal direction. It is tiltably supported by the free end. Also armature
The tension coil spring 21 as a return spring provided between the most free end of the support portion 19 of the support portion 18 and the support plate 8 causes the core 14 to move.
The armature 18 is spring-biased in a direction away from. The armature 18 is formed with a claw 22 as an engaging claw protruding inward at a portion of the opening which is opposite to the supporting portion 19 side through the movable band 3, and the outer peripheral portion of the movable body 13. The claw 22 is engaged with the circumferential groove 23 recessed in the so as to be relatively rotatable. Therefore, when the coil 16 is not excited, the tension coil spring 21 causes the armature to move away from the core 14.
A limit is set so that the armature 18 is separated from the core 14 when the movable body 13 hits the end plate 11a of the input gear 11 when the armature 18 is biased.

The movable body 13 is formed with ratchet teeth 24 facing the large-diameter portion 5 of the driven member 3, and the ratchet teeth 24 facing the large-diameter portion 5 according to the axial movement of the armature 18. Engage and disengage ratchet teeth 25. As shown in FIG. 3, the ratchet teeth 24 and 25 are formed in a saw-tooth shape at equal intervals in the circumferential direction.
The movable body 13 that rotates together with the input gear 11 moves in accordance with the movement of the armature 18, so that the opposing ratchet teeth 25 and the ratchet teeth 24 are shown by imaginary lines only in the direction of the arrow in the drawing, which is the direction of rotation. Thus, the rotational force of the input gear 11 is transmitted to the driven member 3 via the ratchet mechanism.

The coil bobbin 15 has a coil on the left end surface in FIG.
An annular protrusion 26 is provided on the flange 17 to prevent the armature 18 from coming into direct contact with the flange portion 17 in order to easily separate the armature 18 when demagnetizing the armature 14.

Next, the operating procedure of this embodiment will be described below. In the state shown in FIG. 1 in which the coil 16 is demagnetized, the tension coil spring is
Since the armature 18 is urged by the restoring force of 21, and the ratchet teeth 24 are separated from the opposing ratchet teeth 25, the movable body 13 and the driven member 3 are rotatable relative to each other, and the rotation of the input gear 11 is increased. The force is not transmitted to the output shaft 2.

Next, when the coil 16 is excited, the armature 18 is attracted to the flange portion 17 of the core 14 against the biasing force of the tension coil spring 21, so that the armature 18 contacts the protruding end surface of the annular protrusion 26 of the coil bobbin 15. The ratchet teeth 24, 25 are held in contact with each other and the ratchet teeth 24, 25 engage with each other. Therefore, the rotational force of the input gear 11 is transmitted from the movable body 13 to the driven member 3 via the ratchet teeth 24 and 25, and the output shaft 2 rotates integrally with the input gear 11.

When the coil 16 is demagnetized, the ratchet teeth 24 are disengaged from the opposing ratchet teeth 25 by the biasing force of the tension coil spring 21, so that the rotational force of the input gear 11 is not transmitted to the output shaft 2. In this way, both ratchet teeth 24, 25 can be selectively engaged and disengaged while the input gear 11 is rotating, and friction heat and wear when a clutch spring is used at the time of engagement do not occur. Therefore, the durability of the clutch mechanism can be improved.

By the way, in order to surely engage and disengage the two ratchet teeth 24, 25, a certain working stroke is required, but if the stroke amount is large, the armature 18 must be attracted by a strong magnetic force. Therefore, the coil 16 becomes large. According to the present invention, the position at which the claw 22 of the armature 18 is engaged with the circumferential groove 23 of the movable body 13 is the armature 18
Since it is the most distant position from the fulcrum position by the support portion 19 of the movable body 13, it is possible to obtain a sufficient working stroke of the movable body 13 without significantly displacing the entire armature 18, and the coil 16 to the minimum size. Can be miniaturized. Further, since the engagement position between the circumferential groove 23 of the movable body 13 and the claw 22 of the armature 18 is the outermost peripheral portion of the movable body 13, the sliding portions of both are open to the atmosphere, so that the movable body 13
The frictional heat generated by the rotation can be suitably dissipated, and high speed rotation can be improved.

[Effects of the Invention] As described above, according to the present invention, the rotation force of one rotating member can be selectively transmitted to the other rotating member during rotation of the rotating member by using the clutch spring. On the other hand, the number of parts of the clutch mechanism and the number of manufacturing steps can be reduced to reduce the manufacturing cost, and friction heat and wear due to the sliding of the boss portion and the clutch spring during high-speed rotation do not occur. The clutch can be engaged and disengaged at a higher speed. Further, since the ratchet teeth can be engaged and disengaged with each other without largely tilting the armature, the coil can be downsized. Further, by providing the sleeve portion having the cut portion in the axial direction on one of the rotary members, the other rotary member can be easily fitted, and the device can be easily assembled and the cut portion can be easily assembled. By immersing the protrusion of the thrust receiving member, it is possible to eliminate the circumferential rattling of the sleeve portion and increase the rigidity of the shaft supporting portion, and it is possible to favorably support the rotating member. .

[Brief description of drawings]

FIG. 1 is a cutaway view of a clutch device to which the present invention is applied, taken along the axial direction. FIG. 2 is a view taken along the line II-II in FIG. FIG. 3 is a diagram showing the shape of ratchet teeth. FIG. 4 is an enlarged perspective view of the waist showing the shaft support. 1 ... Electromagnetic clutch, 2 ... Output shaft 3 ... Follower member, 3a ... Locking part 4 ... Right extension part, 4b ... Slit 5 ... Large diameter part, 6 ... Shoulder part 7 ... Left-sided extension, 7a ... Expanding head 7b ... Slit, 8 ... Support plate 8a ... Hole, 9 ... Bearing member 10 ... Thrust receiving member, 10a ... Protrusion 11 ... Input gear, 11a ... … End plate part 12 …… Boss part, 13 …… Movable body 14 …… Core, 15 …… Coil bobbin 16 …… Coil, 17 …… Flange part 18 …… Armature, 19 …… Support part 21 …… Tension coil spring 22 …… claw, 23 …… circumferential groove 24 …… ratchet tooth, 25 …… opposed ratchet tooth 26 …… annular protrusion

Claims (2)

[Scope of utility model registration request] A clutch device for selectively transmitting a rotational force between both of the rotating members, the input device and the output rotating member being rotatable relative to each other and coaxial with each other. A movable member supported by either one of the two rotating members so as to be able to transmit the rotational force and movably in the axial direction, and engageable with each other provided so as to face the other of the both rotating members and the movable member. A pair of ratchet teeth, and solenoid means for selectively driving the movable member to engage the ratchet teeth with each other, the solenoid means being provided coaxially with the rotating members. A ring-shaped core, an exciting coil wound around the ring-shaped core, and a radial outside of the ring-shaped core, which is formed so as to surround the movable member and is tiltably movable in a direction toward and away from the end surface of the ring-shaped core. And the armature, which is supported by,
A return spring that elastically biases the armature in a direction to separate it from the annular core, and a supported portion of the armature to reciprocate the movable member in the axial direction by a tilting motion of the armature. The clutch device is characterized in that engaging claws that are rotatable relative to the movable member and engage in the axial direction are formed on opposite sides of the movable member. 2. A sleeve portion formed at an end portion in the axial direction of the other rotating member so as to rotatably support one of the rotating members, and a notch cut in the sleeve portion in the axial direction. 2. A portion according to claim 1, further comprising: a thrust receiving member that has a protrusion that is fitted into the notch portion when fitted into the sleeve portion and that receives a thrust force of the rotating member. Clutch device.