JPH061193Y2 - Bidirectional clutch for mainspring power unit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a clutch for transmitting / disconnecting power. More specifically, the present invention is a bidirectional device suitable for use in a power unit for a traveling toy that uses a mainspring (spiral spring) as a drive source and inputs and outputs rotation through a reduction gear mechanism or other power transmission system. Regarding the clutch.

(Prior Art) A pullback drive type mainspring power unit used as a power unit for a traveling toy such as an automobile toy has a drive wheel mounted on an output shaft rubbed against a floor or the like and pulled in a direction opposite to the traveling direction. It is a structure for winding up (so-called pullback winding). This power unit releases the mainspring when the wheels are released from the floor. Therefore, the mainspring is wound by repeating the pullback winding operation in which the wheels are moved in the running direction with the wheels still attached to the floor and then pulled back in the winding direction. In some cases, it is used in a raised manner. However, as shown in FIG. 3, in the pullback type mainspring power unit, the reduction gear mechanism 108 is interposed between the output shaft (drive wheel) 106 and the drive shaft 107 around which the mainspring is wound, and the reduction gear mechanism 108 is provided.
Since rotation input / output is performed via the rotary shaft, if the above-described winding operation is quick, the rotation of the reduction gear mechanism 108 cannot follow and an excessive force is applied to the gear, which may cause tooth loss or the like.

Therefore, conventionally, it is considered that the clutch 100 is provided in the reduction gear mechanism 108 as shown in the figure, and the transmission of power is cut off when an excessive load acts on the reduction gear mechanism 108. As shown in FIGS. 3 and 4, the clutch 100 includes a pair of clutch pieces 102, 103 having an uneven surface 101 formed in the axial direction between the driving side and the driven side of the reduction gear train, and the uneven surfaces 101 and 103 are mutually formed. Is installed facing each other, one clutch piece 103 is slidable in the axial direction and a meshing clutch in which a pressing spring 105 is interposed between the clutch piece 103 and a collar 104 that is fitted coaxially, The driving side (or the driven side) connected to one clutch piece 102 and the other clutch piece 10
When an excessive load is generated between the driven side (or the driving side) connected to 3 (3), slippage occurs between the concave and convex portions of the clutch pieces 102, 103 to interrupt the transmission of power ( (Actual number 58-91989).

(Problems to be Solved by the Invention) However, this conventional clutch 100 requires a spring 105 and a collar 104 in addition to the pair of clutch pieces 102 and 103, and thus has a problem of increasing the number of parts. Further, since the collar 104 is fitted by providing a space that allows the pair of clutch pieces 102 and 103 to face each other on the concentric shaft and one of the clutch pieces 102 and 103 can be moved in the axial direction, one of the causes that hinders the downsizing of the power plant is saved. There is a risk of becoming. Further, the clutch piece 103
Since the spring 105 is assembled between the collar 104 and the collar 104, there is a problem that the assembling work is troublesome.

Therefore, the present invention provides a bidirectional clutch that has a small number of parts and is easy to assemble, and more specifically, a bidirectional clutch that includes only a pair of clutch pieces that can be formed of a plastic molded product. To aim.

(Means for Solving the Problems) In order to achieve the above object, the bidirectional clutch of the present invention has a ring-shaped elastic portion which is elastically deformable in a radial direction in a cross section orthogonal to the axis and the outermost side of the elastic portion. A male member having a curved surface provided with a curved surface, and a large number of concave portions meshing with the curved surface are arranged in the circumferential direction, and the female member formed of internal gear-shaped unevenness in which these concave portions are connected by convex portions having a curved surface. And are concentrically arranged and combined, the power is transmitted in a state where the protrusion of the male member and the recess of the female member are engaged, and the protrusion of the male member is deformed from the recess of the female member by the radial deformation of the elastic portion. The power transmission is cut off by detaching and overcoming the convex portion.

(Operation) Therefore, power is normally transmitted by the ring-shaped elastic portion of the male member meshing with the protrusion and the recess of the female member. However, when an excessive load is applied between the driving side and the driven side, for example, when the power unit is pushed in the traveling direction (counter-winding direction), the bending protrusion of the female member causes the elastic portion to collapse in the radial direction. It disengages from the recess and slides on it to interrupt the transmission of power. At this time, since the protrusion of the male member and the protrusion of the female member both have curved surfaces, the protrusion of the male member does not stand still at the raised portion of the female member, and it is stable in the state that it always gets over and meshes with the recess. To do.

(Embodiment) Hereinafter, the configuration of the present invention will be described in detail based on an embodiment shown in the drawings.

FIG. 1 is a front view showing an embodiment of the bidirectional clutch of the present invention. This bidirectional clutch includes a male member 1 having a protrusion 4 that is elastically deformable in a radial direction in a cross section orthogonal to an axis, a concave portion 11 that meshes with the male member 1, and a convex portion 15 that is a curved surface that connects the concave portion 11. And a male member 1 and a female member 10 are coaxially combined and arranged so that the protrusions 4 and the recesses 11 mesh with each other.

The male member 1 includes a shaft portion 2 which is interlocked with a driving side or a driven side, an elastic portion 3 which is annular in a cross section orthogonal to the axis thereof, and is elastically deformable in a radial direction, and a tip of the elastic portion 3, that is, an outermost portion. And a protrusion 4 provided on the radial side. At least one set of the elastic portion 3 and the protrusion 4 of the male member 1 is sufficient, but in order to prevent insufficient meshing due to the inclination of the shaft or the like, two sets or three sets or symmetrically are set symmetrically. It is preferable to provide the above. For example, in the case of the present embodiment, two sets of elastic portions 3 and protrusions 4 are symmetrically arranged on the shaft portion 2, that is, arranged in the shape of a figure 8, and the force applied to the protrusions 4 is offset. ing.

The shape of the protrusion 4 is not particularly limited, but in the present embodiment, the female member 10 is ensured to be engaged with the concave portion 11 and the slip is smooth. It has a semicircular shape with a radius of curvature substantially the same as the shape of the concave portion 11 and is integrally molded with the elastic portion 3. The elastic portion 3 is a portion that bends and displaces the protrusion 4 in the radial direction when the protrusion 4 is subjected to an external force of a predetermined magnitude or more, and has a structurally elastic shape, for example, a ring shape (elliptical shape). (Including crushed ring shapes such as shapes and rhombuses). It is also possible to give the structure elasticity by reinforcing the spring member. The shaft portion 2, the elastic portion 3 and the protrusion 4 described above are integrally formed of plastic. As the plastic material, usually a hard thermoplastic resin is adopted, and for example, polyacetal, polypropylene, vinyl chloride, etc. are exemplified as suitable ones, and among them, the acetal having the longest fatigue life and the strongest and most rigid thermoplastic resin. Most preferred is the use of a resin. In the present specification, the plastic refers to various polymers or polymeric materials containing predetermined additives, reinforced by applying fillers such as various fibers or asbestos, and composites with other materials. There are those that mainly include plastic. Of course, an elastic body (elastomer) may be used as the material itself. In this case, the ring-shaped elastic portion 3 is not necessary, and the engagement is released by deforming the entire protrusion 4. still,
The load that causes slippage can be set, for example, by changing the hardness of the elastic body or by reinforcing the spring material.

The shaft portion 2 is integrally formed with a pinion 5 that meshes with any gear of the drive-side (or driven-side) reduction gear mechanism.

The female member 10 is provided with an internal gear-shaped recess 11 inside the disk. The concave portion 11 has the same radius of curvature as the protrusion 4 of the male member 1 and is connected by a convex portion 15 formed of a curved surface to form a continuous wavy shape. Further, the concave portion 11 is not limited to the illustrated one,
It may be provided intermittently in a circumferential shape, or may have a shape other than a semicircle, such as a square or a triangle. This recess 11
In order to prevent the male member 1 from penetrating through on the depth side of the wall 12
Is provided so that the female member 10 is rotatably supported by the shaft portion 2 of the male member 1 by boring a hole 13 that is fitted in the shaft portion 2. In the case of this embodiment, the female member 10
A gear 14 that meshes with the gear of the driven (or drive) reduction gear mechanism is formed on the outer surface side of the, and the female member 10 itself forms a part of the reduction gear mechanism or a constant speed gear mechanism that brakes its rotation speed. I am configuring.

The bidirectional clutch of the present invention can be used not only for the reduction gear mechanism described above, but also for other power transmission systems.

(Effects of the Invention) As is clear from the above description, the bidirectional clutch for a power spring type power plant of the present invention has a ring-shaped elastic portion that is elastically deformable in the radial direction in a cross section orthogonal to the axis and the outermost portion of this elastic portion. It is composed of a male member having a curved surface-shaped convex portion provided on the radial side, and a large number of concave portions meshing with the convex portions, which are arranged in the circumferential direction, and these concave portions are connected by convex portions having a curved surface to form an internal gear-shaped concave and convex portion. The female member and the female member are concentrically arranged and combined, the power is transmitted in a state where the protrusion of the male member and the recess of the female member are meshed, and the protrusion of the male member is deformed in the radial direction of the elastic portion so that the female member is deformed. Since power transmission is cut off by moving away from the recess and over the projection, the number of parts can be reduced compared to the conventional bidirectional clutch, and the protrusion of the male member meshes with the recess of the female member. Because it always stops at Little settling and clutch function can be maintained for a long time. Moreover, this clutch can be constructed only with a plastic molded product, so that the cost can be reduced. Also,
The clutch of the present invention is assembled only by inserting the male member 1 into the female member 10 and engaging the protrusions and the recesses, so that the assembling work is easy and the working time can be shortened. Furthermore, since this clutch can be constructed inside a single gear, it can be made thinner and more compact than conventional ones, and can be incorporated in any part of the reduction gear mechanism etc. without taking up space.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of a bidirectional clutch for a power spring type power plant according to the present invention, and FIG.
FIG. 11 is a sectional view taken along line -11. FIG. 3 is a plan view showing an example of a power spring type power plant incorporating a conventional bidirectional clutch.
The figure is an exploded partial sectional view of the clutch. DESCRIPTION OF SYMBOLS 1 ... Male member, 3 ... Elastic part, 4 ... Convexity, 10 ... Female member, 11 ... Recessed part 15 ... Convex part of female member.

Claims (1)

[Scope of utility model registration request] 1. A male member having a ring-shaped elastic portion which is elastically deformable in a radial direction in a cross-section orthogonal to the axis, a convex portion formed of a curved surface provided on the outermost diameter side of the elastic portion, and the convex portion. A large number of meshing concave portions are arranged in the circumferential direction, and a female member formed of concavities and convexities in the shape of an internal gear in which these concave portions are connected by convex portions formed of curved surfaces are concentrically arranged and combined, and the protrusion of the male member and the female member are combined. The power is transmitted in a state of being meshed with the concave portion of the member, and the protrusion of the male member is disengaged from the concave portion of the female member due to the radial deformation of the elastic portion and overcomes the convex portion to interrupt the power transmission. A bidirectional clutch for the mainspring power unit.