JP3039460U - Friction clutch - Google Patents

Abstract

(57) [Abstract] [Purpose] The work of attaching a felt, which is a friction member, to a pulley, which is a driving member, is simplified, and the center of the friction member and the center of the driving member can be easily aligned with each other, and the cost is reduced. It is also advantageous. [Constitution] A pulley 100 having a convex portion 110 provided around the center of rotation, a hole 210 corresponding to the convex portion 110 of the pulley 100, and a felt 200 into which the convex portion 110 is fitted in the hole 210, and a felt 200. The driven-side rotating body 300 that is pressed by 200 and the compression spring 400 that presses the driven-side rotating body 300 toward the pulley 100 are provided, and the surface that is pressed by the felt 200 attached to the driven-side rotating body 300. The two ridges 330 centering on the rotation center are concentrically provided in the.

Description

[Detailed description of the invention]

[0001]

[Industrial applications]

 The present invention relates to a friction clutch used for transmitting rotational driving force in, for example, a video cassette deck.

[0002]

[Prior art]

 Friction clutches are used in video cassette decks as a means of transmitting rotational driving force. For example, it is used in a mechanism for transmitting rotation from a motor to two reels, that is, a supply side reel and a winding side reel.

This friction clutch includes a driving member that is rotationally driven by a motor, a friction member that is attached to the driving member, a driven member that is pressed by the friction member, and the driven member that is placed on the driving member side. And an elastic member for pressing.

For example, as the driving member, there is a pulley for transmitting the rotational driving force from the motor by a belt, and as the friction member, there is a felt. This friction member was attached to one surface of a pulley as a driving member with a double-sided tape or an adhesive.

The driven member is pressed by the elastic member toward the drive member, that is, the friction member, so that the rotational drive of the drive member is transmitted.

[0006]

[Problems to be solved by the device]

 However, the work of attaching the friction member to the drive member must be performed so that the center of the friction member and the rotation center of the drive member coincide with each other. That is, if the friction member is deviated from the center of rotation of the drive member, there is a risk of rattling in rotation. Therefore, a high precision is required for the work of attaching the friction member. Therefore, it is a labor-intensive work, and since materials such as double-sided tape are required, there is a problem that the cost becomes high.

The present invention was devised in view of the above circumstances, and the work of attaching the friction member to the drive member is simplified, and the center of the friction member and the center of the drive member can be easily aligned. Moreover, the aim is to provide a friction clutch that is also advantageous in terms of cost.

[0008]

[Means for Solving the Problems]

 The friction clutch according to the present invention is provided with a drive member having a convex portion around the center of rotation and a hole corresponding to the convex portion of the drive member, and the convex portion is fitted into the hole. The friction member, the driven member that is pressed by the friction member, and the elastic member that presses the driven member toward the driving member are provided on the surface of the driven member that is pressed by the friction member. Is provided with one or more ridges concentrically around the center of rotation.

Further, the friction clutch according to the present invention includes a driving member having a recess centered on the center of rotation, and a friction member formed in a shape corresponding to the recess of the driving member and fitted in the recess. And a driven member that is pressed by the friction member and an elastic member that presses the driven member toward the driving member, and the surface that is pressed by the friction member attached to the driven member is One or a plurality of veins centering on the center of rotation may be provided concentrically.

Further, in the friction clutch according to the present invention, an opening centering on the center of rotation is provided, and a driving member provided with a convex portion around the opening and a shaft penetrating the opening project. A first driven member that is provided with a convex portion around the shaft and a hole that fits into the convex portion of the first driven member, and is provided between the first driven member and the driving member. A first friction member, a second driven member having a fitting hole into which a shaft penetrating the opening fits, and a hole to fit into a convex portion of the driving member. A second friction member interposed between the second driven member and the driving member, and an elastic member for pressing the second driven member toward the driving member, and the first driven member. The surface where the member is pressed by the first friction member and the surface where the second driven member is pressed by the second friction member are Alternatively, one or a plurality of veins centering on the rotation center may be provided concentrically.

[0011]

[Embodiment of the invention]

 1 is a schematic sectional view of a friction clutch according to a first embodiment of the present invention, and FIG. 2 is a schematic plan view of a felt used in the friction clutch according to the first embodiment of the present invention. 3 is a schematic plan view of the surface of the driven side rotating body used for the friction clutch according to the first embodiment of the present invention, which is pressed by the felt, and FIG. 4 is the second embodiment of the present invention. 5 is a schematic sectional view of a friction clutch according to the present invention, FIG. 5 is a schematic plan view of a felt used in the friction clutch according to the second embodiment of the present invention, and FIG. 6 is related to the second embodiment of the present invention. FIG. 7 is a schematic plan view of the side of the pulley used for the friction clutch on which the concave portion is provided, and FIG. 7 is a schematic sectional view of the friction clutch according to the third embodiment of the present invention.

The friction clutch according to the first embodiment of the present invention includes a pulley 100 as a driving member provided with a convex portion 110 centering on a rotation center, and a hole corresponding to the convex portion 110 of the pulley 100. 210 is opened, the felt 200 as a friction member into which the convex portion 110 is fitted in the hole, the driven side rotating body 300 as a driven member pressed by the felt 200, and the driven side rotating body 300. And a compression spring 400 as an elastic member for pressing the pulley 100 toward the pulley 100.

A through hole 120 is formed in the center of the pulley 100. The through hole 120 is a portion through which the rotation shaft 500, which is the rotation center of the pulley 100, penetrates. Further, a convex portion 110 is formed on one surface of the pulley 100, that is, a surface facing the driven-side rotating body 300. The convex portion 110 is formed in a regular hexagon centered on the center of rotation of the pulley 100, and its thickness dimension is smaller than the thickness dimension of the felt 200 to which it is attached. Even if the rotating body 300 is pressed toward the pulley 100, the size is set so that the driven side rotating body 300 does not contact the convex portion 110.

On the other hand, the felt 200 as a friction member has a regular hexagonal hole 210 formed at the center, as shown in FIG. The hole 210 corresponds to the shape and size of the convex portion 110 of the pulley 100, and the convex portion 110 is fitted into the hole 210 exactly.

The driven side rotating body 300 is formed in a substantially frame shape in which a shaft 310 is projected from the center, and a through hole 311 is formed in the shaft 310, and the pulley 100 of the pulley 100 is formed in the through hole 311. A rotation shaft 500 that also serves as a rotation center is penetrated. Therefore, the driven-side rotating body 300 is provided coaxially with the pulley 100. The driven-side rotating body 300 is slidable along the rotating shaft 500.

In addition, as shown in FIG. 3, on the surface of the driven-side rotating body 300 facing the pulley 100, that is, the surface 320 on which the shaft 310 is not projected, as shown in FIG. In the drawing, two ribs 330 are provided concentrically. The protrusion 330 is a portion that bites into the felt 200, and the protrusion dimension thereof is set to be slightly smaller than the thickness dimension of the felt 200. Further, the ridge 330 has a substantially triangular cross section as shown in FIG.

Further, an elastic member is provided on the other surface of the driven-side rotating body 300, that is, a surface different from the surface 320 on which the protrusions 330 are formed and on the side on which the shaft 310 is projectingly provided. All compression springs 400 are pressed against each other. That is, the driven-side rotating body 300 is pressed toward the pulley 100 by the compression spring 400.

That is, in the friction clutch thus configured, the rotation of the pulley 100 is transmitted to the driven-side rotating body 300 via the felt 200. At this time, the ridge 330 of the driven-side rotating body 300 bites into the felt 200, but since the ridge 330 is formed on a concentric circle centered on the rotation center of the driven-side rotating body 300, the rotation axis The felt 200 does not shift in the direction orthogonal to 500, that is, in the lateral direction. The protrusions 110 also prevent the lateral movement of the felt 200.

Further, when the felt 200 is attached to the pulley 100, since the positioning saler is accurately provided only by making the hole 210 of the felt 200 correspond to the convex portion 110 of the pulley 100, it is extremely possible to use the double-sided tape or the like unlike the conventional case. The felt 200 can be easily attached to the pulley 100.

When an excessive rotational force is transmitted to the pulley 100, a slip occurs between the felt 200 and the driven-side rotating body 300, so that the rotation of the pulley 100 is not transmitted to the driven-side rotating body 300.

On the other hand, in the friction clutch according to the second embodiment of the present invention, as shown in FIG. 4, a pulley 100 which is a driving member provided with a recess 150 around the center of rotation and a pulley 100 of this pulley 100. The felt 200, which is a friction member formed in a shape corresponding to the recess 150 and fitted in the recess 150, the driven rotating body 300 which is the driven member pressed by the felt 200, and the driven rotation. It has a compression spring 400 which is an elastic member that presses the body 300 toward the pool 100.

Here, the friction clutch according to the second embodiment differs from the friction clutch according to the first embodiment in the structure of positioning the felt 200 with respect to the pulley 100. That is, in the friction clutch according to the second embodiment, by forming the wall portion 160 around the rotation center on the outer peripheral portion of the pulley 100, the inner portion of the wall portion 160 becomes the recess 150, The felt 200 is fitted into the recess 150.

That is, the wall 160 is formed in a regular hexagon as shown in FIG. 6, and the recess 150 inside thereof is a regular hexagon. On the other hand, the felt 200 fitted into the recess 150 has an outer periphery formed into a regular hexagon corresponding to the recess 150. In addition, a hole 220 through which the rotary shaft 500 penetrates is formed at the center of the felt 200.

The height dimension of the wall portion 160 forming the recess 150, that is, the depth dimension of the recess 150 is smaller than the thickness dimension of the felt 200 to be attached. Even if the driven-side rotating body 300 is pressed against the pulley 100 side, the driven-side rotating body 300 is dimensioned so as not to contact the wall portion 160.

The other points of the friction clutch according to the second embodiment are substantially the same as the friction clutch according to the first embodiment described above.

Therefore, in the friction clutch according to the second embodiment, the rotation of the pulley 100 is transmitted to the driven-side rotating body 300 via the felt 200, and at that time, the felt 200 causes the driven-side rotating body 300 to project. The slippage of the veins 330 prevents lateral displacement of the felt 200. The lateral displacement of the felt 200 is prevented not only by the ribs 330 but also by the wall portion 160 forming the recess 150. Further, when an excessive torque is transmitted to the pulley 100, a slip occurs between the felt 200 and the driven-side rotating body 300, so that the rotation of the pulley 100 is not transmitted to the driven-side rotating body 300.

Next, a friction clutch according to a third embodiment of the present invention will be described with reference to FIG.

The friction clutch according to the third embodiment has a pulley 100, which is a drive member, in which an opening 120 around the center of rotation is provided and a convex portion 110 is provided around the opening 120. A first driven-side rotating body 600, which is a first driven member, is provided with a shaft 620 penetrating the opening 120, and a convex portion 610 is provided around the shaft 620, and the first driven-side rotating body 600. A hole 710 that fits into the convex portion 610 of the rotating body 600 is opened, and a first felt 700 that is a first friction member interposed between the first driven side rotating body 600 and the pulley 100, A second driven-side rotating body 800, which is a second driven member having a fitting hole 810 into which the shaft 620 penetrating the opening 120 is fitted, and a hole 910 fitted into the convex portion 110 of the pulley 100. Is established , A second felt 900 that is a second friction member interposed between the second driven-side rotating body 800 and the pulley 100, and elasticity that presses the second driven-side rotating body 800 toward the pulley 100. And a compression spring 400 which is a member.

The pulley 100 is similar to the friction clutches according to the first and second embodiments described above, but the opening 120 not only penetrates the rotation shaft 500, but also has a first driven side rotation. The shaft 620 of the body 600 is adapted to penetrate therethrough.

A regular hexagonal convex portion 110 is formed around the opening 120 of the pulley 100. The protrusion 110 is a portion into which the hole 910 of the second felt 900 to be attached fits, and the thickness dimension thereof is set to be slightly smaller than the thickness dimension of the second felt 900. In detail, even if the second driven-side rotating body 800 is pressed by the compression spring 400 toward the pulley 100, the size is set so that the second driven-side rotating body 800 does not contact the convex portion 110.

Further, on one surface of the first driven-side rotating body 600, a shaft 620 penetrating the through hole 621 is provided so as to project at the center of rotation. The shaft 620 penetrates the opening 120 and is fitted with a gear 950. The through hole 621 is a portion through which the rotary shaft 500 penetrates.

Further, a part of the shaft 620, that is, a portion where the second driven-side rotating body 800 is fitted is set to have a regular hexagonal shape in cross section.

Further, a regular hexagonal convex portion 610 is provided at the base end portion of the shaft 620. The convex portion 610 is a portion into which a hole 710 of the first felt 700 described later is fitted, and the thickness dimension thereof is set to be slightly smaller than the thickness dimension of the first felt 700.

In addition, one surface of the first driven-side rotating body 600, that is, a surface on which the shaft 620 is projected, and the surface pressed by the first felt 700 has the rotation center, that is, the shaft 620. Two ridges 630 as the center are provided concentrically.

On the other hand, a second driven-side rotating body 800 is attached to the opposite side of the pulley 100. A regular hexagonal fitting hole 810 corresponding to the regular hexagonal shape of the shaft 620 is provided at the center of rotation of the second driven-side rotating body 800. Therefore, the second driven-side rotating body 800 and the first driven-side rotating body 600 are connected in the rotation direction via the shaft 620.

Further, on the surface of the second driven-side rotating body 800 that is pressed by the second felt 900, two ridges 830 around the center of rotation, that is, the fitting hole 810 are provided in a concentric pattern. Has been.

The second felt 900 interposed between the second driven rotary member 800 and the pulley 100 has a regular hexagonal hole 910 corresponding to the convex portion 110. Therefore, the second felt 900 is positioned by being fitted into the convex portion 110.

The second driven rotor 800 is pressed toward the pulley 100 by the compression spring 400 interposed between the second driven rotor 800 and the gear 950 fitted to the shaft 620.

The operation of the friction clutch thus configured will be described. The rotation transmitted to the pulley 100 is transmitted to the first driven-side rotating body 600 and the second driven-side rotating body 800 via the first felt 700 and the second felt 900. That is, since the second driven-side rotating body 800 is pressed toward the pulley 100 by the compression spring 400, the rotation is transmitted via the second felt 900. Further, since the first driven-side rotating body 600 and the second driven-side rotating body 800 are connected by the shaft 620, the rotation of the second driven-side rotating body 800 is the first driven-side rotating body 600. And the first driven-side rotating body 600 is in contact with the pulley 100 via the first felt 700, the rotation of the pulley 100 is transmitted to the first driven-side rotating body 600. .

When an excessive rotational force is applied to the pulley 100, slippage occurs between the first felt 700, the second felt 900, and the first driven-side rotating body 600 and the second driven-side rotating body 800. Since the rotation occurs, the rotation of the pulley 100 is not transmitted to the first driven-side rotating body 600 and the second driven-side rotating body 800.

[0041]

[Effect of the invention]

 The friction clutch according to the present invention is provided with a drive member having a convex portion around the center of rotation and a hole corresponding to the convex portion of the drive member, and the convex portion is fitted into the hole. The friction member, the driven member that is pressed by the friction member, and the elastic member that presses the driven member toward the driving member are provided on the surface of the driven member that is pressed by the friction member. Is provided with one or more ridges concentrically around the center of rotation.

Therefore, in this friction clutch, it is possible to accurately position the friction member only by fitting the convex portion of the drive member into the hole of the friction member, and in addition to the conventional double-sided tape or tape. The friction member can be attached to the drive member without using an adhesive or the like, which greatly facilitates the attachment work of the friction member and contributes to a reduction in manufacturing cost. Further, since the ribs bite into the friction member, the friction member does not shift in the lateral direction. In particular, even if there is a slight error in the dimension between the hole and the convex portion, no deviation occurs. Therefore, uneven rotation due to the displacement of the friction member does not occur.

Further, the friction clutch according to the present invention is provided with a driving member provided with a recess around the center of rotation, and a friction member formed in a shape corresponding to the recess of the drive member and fitted into the recess. And a driven member that is pressed by the friction member and an elastic member that presses the driven member toward the driving member, and the surface of the driven member that is pressed by the friction member is centered on the center of rotation. The same effect can be obtained even if one or a plurality of ridges to be provided are concentrically provided.

Further, in the friction clutch according to the present invention, an opening centering on the rotation center is provided, and a driving member provided with a convex portion around the opening and a shaft penetrating the opening project. A first driven member that is provided with a convex portion around the shaft and a hole that fits into the convex portion of the first driven member, and is provided between the first driven member and the driving member. A first friction member, a second driven member having a fitting hole into which a shaft penetrating the opening fits, and a hole to fit into a convex portion of the driving member. A second friction member interposed between the second driven member and the driving member, and an elastic member for pressing the second driven member toward the driving member, and the first driven member. The surface where the member is pressed by the first friction member and the surface where the second driven member is pressed by the second friction member are , One or a plurality of veins centering on the center of rotation are concentrically provided.

The friction clutch constructed as described above exhibits the above-mentioned effects, and since the driven member is pressed from both surfaces of the driving member through the friction member, it is used even in the case of higher torque. be able to.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of a friction clutch according to a first embodiment of the present invention.

FIG. 2 is a schematic plan view of a felt used in the friction clutch according to the first embodiment of the present invention.

FIG. 3 is a schematic plan view of a surface of the driven-side rotating body used for the friction clutch according to the first embodiment of the present invention, the surface being pressed by the felt.

FIG. 4 is a schematic sectional view of a friction clutch according to a second embodiment of the present invention.

FIG. 5 is a schematic plan view of a felt used in a friction clutch according to a second embodiment of the present invention.

FIG. 6 is a schematic plan view of a pulley provided in a friction clutch according to a second embodiment of the present invention on a side where a recess is provided.

FIG. 7 is a schematic sectional view of a friction clutch according to a third embodiment of the present invention.

[Explanation of symbols]

 100 Pulley (Driving Member) 110 Convex Part 200 Felt (Friction Member) 210 Hole 300 Driven Side Rotating Body (Driven Member) 330 Pulse 400 Compression Spring (elastic member)

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Internal reference number FI Technical display location G11B 33/12 313 G11B 33/12 313C (72) Inventor Katsunori Onishi 7-7 Nakagakiuchi, Daito City, Osaka Prefecture No. 1 Funai Electric Co., Ltd.

Claims (3)

[Utility model registration claims] 1. A drive member provided with a convex portion centering on the center of rotation, a friction member in which a hole corresponding to the convex portion of the drive member is formed, and the convex portion is fitted into the hole. The driven member that is pressed by the friction member and the elastic member that presses the driven member toward the driving member are provided, and the surface of the driven member that is pressed by the friction member is
A friction clutch, wherein one or a plurality of ridges centering on a rotation center are provided in a concentric shape. 2. A drive member provided with a recess around the center of rotation, a friction member formed in a shape corresponding to the recess of the drive member, and fitted in the recess, and pressed by the friction member. A driven member and an elastic member that presses the driven member toward the driving member. The surface of the driven member, which is pressed by the friction member, has one or a plurality of centers about the center of rotation. The friction clutch is characterized in that the veins are provided concentrically. 3. A drive member having an opening centered on the center of rotation and a convex portion provided around the opening, and a shaft penetrating the opening, the projecting portion being provided around the shaft. A first driven member provided with a first friction member and a first friction member interposed between the first driven member and the driving member and having a hole for fitting with a convex portion of the first driven member. A second driven member provided with a fitting hole into which a shaft penetrating the opening is fitted, and a hole fitted into a convex portion of the drive member,
The first driven member includes a second friction member interposed between the second driven member and the driving member, and an elastic member that presses the second driven member toward the driving member. Is the first
The surface pressed by the friction member and the surface pressed by the second driven member by the second friction member are concentrically provided with one or a plurality of ridges about the center of rotation. Friction clutch characterized by that.