JPH0579731U - Slip device for small equipment - Google Patents

Abstract

(57) [Abstract] [Purpose] An object of the present invention is to provide a slip device suitable for use in a driving force transmission device for home electric appliances and the like, for small equipment. A first gear A, a slip member 1 pressed by the gear A, a spring 2 for urging the slip member 1 toward the gear A, and a slip member 1 via the spring 2. In the slip device composed of the second gear B that rotates integrally, the first gear A driven by the motor M has the concave portion 7, and the slip member 1 has the convex portion 8 that engages with the concave portion 7. This is a slip device for a small device, in which the gear A, the slip member 1, and the gear B are integrally formed of resin.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a slip device for small equipment, which is suitable for use in a device having a small driving force such as a small electric product.

[0002]

[Prior art and its problems]

 When an excessive driving force is transmitted due to some trouble in various driving force transmission devices, there is a possibility of inconvenience such as the worm gear being caught, the gear being damaged, or the driving motor being destroyed.

For this reason, a slip device has been conventionally incorporated in the driving force transmission device.

Conventionally, a friction transmission method using a belt or a slip member such as a felt material has been generally used in a slip device for a small device used for an electric product having a small driving force such as a record player, a cassette tape player, and a CD player. is there. For example, FIG. 3 shows an example using a belt. The driving force of the motor M is transmitted to the pulley 24 via the worm gear 21, the helical gear 22, and the belt 23, but the pulley 24 is locked, for example. The belt 23 slips and the helical gear 22 runs idle. Therefore, breakage of the motor M or biting of the worm gear 21 can be avoided. Further, for example, Japanese Utility Model Laid-Open No. 3-37633 discloses a slip device that pushes a slip member against a gear and transmits a driving force by friction of the slip member. In this case also, the gear idles when the transmission force becomes excessive. The extra transmission force can be released.

However, as described above, transmission by friction has low durability of the friction means, and because the belt tension and the friction coefficient of the slip material may change due to environmental changes such as temperature changes, a small driving force is required. Small devices that operate are especially susceptible to this.

On the other hand, the slip device of Japanese Utility Model Publication No. 63-37181 is for transmitting a large driving force used in an electric tool such as an electric drill. The gear is provided with a recess and the slip member side is provided with a steel ball. A large driving force is transmitted by the engagement between the recess and the steel ball, and when the driving force becomes excessive, the steel ball gets over the recess and the gear runs idle. This slip device can solve problems due to durability and environmental changes, but using it for small appliances such as electric appliances that operate with a small driving force causes problems with respect to the number of parts, weight, assembly man-hours, cost, etc. Is not preferable.

In order to solve the above-mentioned problems of the prior art, the object of the present invention is high durability, high reliability that is not affected by changes in the environment, etc., yet has a small number of parts and is lightweight. Therefore, it is an object of the present invention to provide a low-cost slip device for small devices that is easy to assemble.

[0008]

[Means for Solving the Problems]

 In order to solve the above problems, the present invention provides a first gear A, a slip member 1 pressed by the gear A, a spring 2 for urging the slip member 1 in the direction of the gear A, and further this spring. When the second gear B which rotates integrally with the slip member 1 via 2 is engaged with the shaft 3 and the force transmitted from one gear to the other gear becomes excessive, the first gear In the slip device in which A and the slip member 1 slip on their pressing surfaces, a concave portion is formed on one of the pressing surfaces of the first gear A and the slip member 1, and a convex portion which is engaged with the concave portion on the other side. A slip device for a small device, in which a part is provided and the component provided with the convex portion is a resin integrally molded product.

[0009]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. 1 and 2 show an embodiment of the present invention. FIG. 1 is a disassembled perspective view of a slip device for small equipment, and FIG. 2 is a sectional view of the slip device for small equipment.

The same parts and the same parts in FIGS. 1 and 2 are designated by the same reference numerals, and the basic components of the slip device for a small device of the present embodiment are a first gear A, a second gear B, and a slip member. 1, a spring 2, a shaft 3, and a motor M for driving, a worm gear 4, a resin washer 5, an E ring 6, and the like.

Further, in this embodiment, through holes 7 are provided as recesses in the first gear A at four positions at equal intervals, and convex portions 8 having an arc-shaped cross section are provided at four positions corresponding to the through holes 7 of the slip member 1. Was established. In the case of a small device that transmits a small driving force, even if the convex portion 8 is made of resin, there is no problem of durability and the driving force can be transmitted reliably. Further, since the slip member 1 provided with the convex portion 8 is an integrally molded product made of resin, it has an excellent effect that the convex portion 8 is easily molded, the number of parts is small, the assembly is easy, and the weight is light. In a slip device used for small appliances such as home electric appliances, it is preferable to use resin from the viewpoint of cost and weight, and the present invention has a structure with convex and concave portions excellent in transmitting durability and driving force. It is a combination of engagement methods, and it is extremely effective in practice to use a means provided with a convex portion as in the present invention as an integrally molded product of resin. Further, according to this method, the characteristics of the device are determined by the force of the spring 2 that urges the slip member 1, so that no troublesome labor for adjusting the assembly is required.

In the present embodiment, the gears A and B are also integrally formed of resin.

Further, the cylindrical portion of the slip member 1 is provided with a plurality of mountain-shaped key grooves 9 along the peripheral surface thereof, and the cylindrical portion of the second gear B has a convex portion fitted into the key groove 9. 10 are similarly provided along the peripheral surface.

The slip device of the present embodiment having the above-described configuration is assembled as shown in FIG. 2, and the slip member 1 presses the surface having the convex portion 8 against the first gear A by the bias of the spring 2. The protrusion 8 is fitted into the through hole 7. Further, the key member 9 of the slip member 1 is fitted into the convex portion 10 of the second gear B in a biased state via the spring 2 and can move in the direction of the gear B by a distance substantially equal to the height of the convex portion 8. Is kept in a good condition. Therefore, the slip member 1 cannot rotate with respect to the second gear B, and they always rotate integrally.

In this assembled state, when the motor M is driven, the driving force is transmitted to the first gear A via the worm gear 4, and the convex member 8 is fitted into the through hole 7 by pressing. The driving force is transmitted to 1 and the driving force is transmitted to the second gear B that rotates integrally with the slip member 1.

If the second gear B is locked due to some trouble, the convex portion 8 of the slip member 1 gets over the through hole 7 of the first gear A 1, and the slip member 1 moves axially at this time. Then, the first gear A idles. Therefore, damage to the motor M can be prevented.

Although one embodiment of the present invention is configured as described above, the present invention is not limited to this, and, for example, the means provided with the convex portion is a resin integrally molded product. Therefore, the shape, size, number, etc. of the convex portions can be arbitrarily changed together with the concave portions to be engaged according to the characteristics of the slip device to be designed.

[0018]

【effect】

 As described above, according to the present invention, one of the pressing surfaces of the first rotating means and the slip means is provided with a concave portion, and the other is provided with a convex portion that engages with the concave portion. Since the means is an integrally molded product made of resin, it has high durability when used in small equipment with a small driving force, and stable transmission is always possible without being affected by temperature changes, etc. Since it is an integrally molded product of resin, the convex shape can be molded at low cost, the number of parts is small, the assembly is easy and the cost is low, and it is suitable for small equipment such as home electric appliances and slip device for small equipment. Become.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a slip device for a small device according to an embodiment of the present invention.

FIG. 2 is a sectional view of a slip device for a small device according to an embodiment of the present invention.

FIG. 3 is a configuration diagram of a conventional belt driving slip device.

[Explanation of symbols]

 A 1st gear B 2nd gear 1 Slip member 2 Spring 7 Through hole (recess) 8 Convex part

Claims (1)

[Scope of utility model registration request] 1. A second rotating means coaxial with the first rotating means, a slip means which cannot rotate with respect to the second rotating means and is movable in the axial direction, and a first rotating means. On the other hand, the first rotating means and the slip means are provided with a concave portion on one of the pressing surfaces, and the other surface is provided with a convex portion to be engaged with the concave portion. Since the means provided with the convex portion is an integrally molded product of resin, when one rotating means is driven, the drive is transmitted to the other rotating means by the engagement of the concave portion and the convex portion, and When the rotating means is locked, the convex portion rides over the concave portion and one of the rotating means idles, and a slip device for a small device.