JPH08126786A - Portable electric apparatus containing motor - Google Patents

Abstract

PURPOSE: To reduce a metal mold cost and the parts cost of an electric apparatus by reducing the manufacturing cost of vibration isolating rubber and eliminating the need for the metal molds to be exclusively used for molding the vibration isolating rubber even if a structure for mounting a motor is changed. CONSTITUTION: This portable electric apparatus contg. the motor is formed by mounting the motor 1 in the case 5 via the vibration isolating rubber 3. The outer periphery of a connecting member 2 for fixing the motor 1 to the case 5 is provided with a mounting part 2A for mounting an O-ring. The O-ring is mounted as the vibration isolating rubber 3 at the fitting part 2A of the connecting member 2 and the motor 1 is mounted in the case 5 with the O-ring as the vibration isolating rubber.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable electric device having a built-in motor, such as an electric razor and an electric toothbrush.

[0002]

2. Description of the Related Art A portable electric device such as an electric razor is mounted on a case through a vibration-proof rubber so that vibration of a motor is not directly transmitted to the case. In particular, electric appliances such as electric razors and electric toothbrushes that reciprocate an inner blade and a toothbrush via a cam are mounted on a case via a vibration-proof rubber because the motor vibrates due to a reaction.

1 and 2 show a conventional example in which a motor is mounted on a case via a vibration-proof rubber. In the electric device shown in these figures, the rectangular connecting member 2 is fixed to the motor 1,
The anti-vibration rubber 3 is attached to the corner portion of the connecting member 2. The anti-vibration rubber 3 is formed in an L-shape and has a groove inside so as to be attached to the corner portion of the connecting member 2. Further, the L-shaped anti-vibration rubber 3 attached to the four corners of the connecting member 2
Are connected by a thin wire rod on the outer periphery to form an integral structure. In the electric device of this structure, the outside of the vibration isolating rubber 3 is fitted into the recess 4 provided in the case, and the motor 1 is attached to the case via the vibration isolating rubber 3 and the connecting member 2.

[0004]

The electric machine having this structure is characterized in that the vibration of the motor is not directly transmitted to the case. However, since the structure is such that the antivibration rubber is interposed, it is necessary to mold the antivibration rubber according to the shape of the connecting member. Since the mounting structure of the motor differs depending on the application of the electric machine or the model, it is necessary to specially manufacture a vibration-proof rubber having a unique shape for each electric machine. For this reason, the electrical equipment is redesigned, or
In electric machines of different models, it is necessary to manufacture a special mold for molding the vibration-proof rubber, which has a drawback that the cost of the vibration-proof rubber mold increases.

Further, since it is necessary to manufacture a vibration-proof rubber molded in a dedicated shape depending on the model, there is a drawback that the price of the vibration-proof rubber becomes high in a variety of products in small quantities and the unit price becomes high.

The present invention was developed for the purpose of solving this drawback. An important object of the present invention is to significantly reduce the manufacturing cost of the anti-vibration rubber by using a general-purpose O-ring, which is already widely used for many purposes, as the waterproof rubber, and to change the motor mounting structure. Even so, it is an object of the present invention to provide a portable electric device having a built-in motor that does not require a dedicated mold for molding a vibration-proof rubber and can reduce the mold cost and reduce the component cost of the electric device.

[0007]

A portable electric device incorporating a motor according to the present invention has the following constitution in order to achieve the above-mentioned object. In the portable electric device, a built-in motor 1 is attached to a case 5 via a vibration-proof rubber 3. The connecting member 2 for fixing the motor 1 to the case 5 has
A fitting portion 2A to which the O-ring is attached is provided. An O-ring is attached to the fitting portion 2A of the connecting member 2, and the O-ring is used for the anti-vibration rubber 3 to fix the motor 1 to the case 5.

[0008]

The portable electric device incorporating the motor of the present invention uses an O-ring as the vibration-proof rubber 3. O-rings are general-purpose parts that are extremely often used as packing, and various types of thicknesses and sizes are mass-produced. Therefore, when the O-ring is used for the vibration-proof rubber 3, it is not necessary to mold and manufacture the dedicated vibration-proof rubber 3 for the device, and the vibration-proof rubber 3
Does not require expensive molds to mold. The O-ring is a commonly used general-purpose part and is designed to have excellent durability as a packing. Therefore, when the O-ring is used for the vibration-proof rubber 3, the cost of the vibration-proof rubber 3 can be remarkably reduced, and deterioration over time can be prevented, so that the motor 1 can be mounted on the case 5. Furthermore, since the O-ring is a standard product, it is not necessary to stock the dedicated anti-vibration rubber 3 as a maintenance part to be replaced when it breaks down. This is because standard O-rings can be used as maintenance parts.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. However, the embodiments described below exemplify a portable electric device incorporating a motor for embodying the technical idea of the present invention, and the present invention does not specify the portable electric device to the following. .

Further, in this specification, in order to make it easy to understand the claims, the numbers corresponding to the members shown in the embodiments are referred to as "claims", "actions", and "actions". In the column of "Means for solving the problem". However, the members shown in the claims are
It is by no means specific to the members of the examples.

The portable electric device incorporates a motor as a power source and is, for example, an electric razor or an electric toothbrush. However, the present invention does not specify portable electric appliances as electric razors and electric toothbrushes. The portable electric device can be any portable electric device with a built-in motor. In addition, portable electric appliances
It is driven by a battery (not shown) built in the case 5.

The portable electric device of the present invention has a unique structure in which the motor is mounted on the case. Therefore, the part where the motor is mounted on the case will be described in detail below. The other part has an optimal structure depending on the application of the electric device, and may be the same structure as the electric device that is currently used or a structure to be developed. Further, the portable electric device of the present invention is most suitable for a member that is driven by a motor, such as an inner blade or a toothbrush that reciprocates. This is because the electric device reciprocating by the motor vibrates due to the reaction of the reciprocating member, and thus the vibration transmitted to the case can be reduced by mounting it on the case via the vibration-proof rubber.

3 and 4 are perspective views showing a portion where the motor 1 is mounted on the case 5. As shown in FIG. The motor 1 shown in these figures has a connecting member 2 screwed to the front surface. The connecting member 2 is a hard plastic plate and is formed in a rectangular shape slightly larger than the outer shape of the motor 1. Connecting member 2
Is fixed to the front surface of the motor 1 via two screws 6. Further, the connecting member 2 has a groove-shaped fitting portion 2A formed on the outer periphery thereof, into which an O-ring used as the vibration-proof rubber 3 is fitted. The connecting member 2 has a groove-shaped fitting portion 2A formed on the entire circumference, so that the O-ring can be attached most hardly. However, the connecting member 2 may be formed with groove-shaped fitting portions 2A only on both sides, or may be partially provided with groove-shaped fitting portions 2A on each side. Further, since the fitting portion 2A is for mounting the O-ring in a fixed position, it is not always necessary to form the groove shape. For example, although not shown, a pair of protrusions may be formed to face each other to form a fitting portion, and an O-ring may be mounted between the protrusions. Opposing protrusions are provided at intervals so that an O-ring can be fitted between them. A plurality of sets of protrusions are provided on the outer periphery of the connecting member at a predetermined interval, and O
Put on the ring.

The connecting member 2 having an O-ring mounted on the outer circumference,
It is attached to a connecting wall integrally formed with the case 5. In the case 5 of FIG. 3, the connecting wall 7 is integrally formed so as to vertically face the bottom surface, and the groove 7 into which the connecting member 2 can be inserted is formed on the facing surface of the connecting wall 7.
A is provided. The bottom surface of the groove 7A is formed in a flat shape. The flat bottom is locally pressed against the O-ring. In this contact state, the vibration of the motor is absorbed in an ideal state, and the O-ring, which is the vibration isolating rubber 3, is deformed to connect the connecting member 2 and the connecting wall 7 in a pressed state without rattling. . As shown in FIG. 5, an anti-vibration rubber, which is an O-ring that is locally pressed against the groove bottom of the connecting wall 7, is easily deformed when the amount of deformation is small, and as the amount of deformation increases, it deforms with respect to the pressing force. This is because the amount of pressure decreases and the pressing force resistance increases.

The O-ring which is the vibration-proof rubber 3 is sandwiched between the connecting member 2 and the case 5, as shown in FIG. That is, the connecting member 2 is connected to the case 5 via the O-ring which is the vibration-proof rubber 3. According to this structure, when the motor 1 vibrates and the connecting member 2 vibrates, the vibration is O
Since it is absorbed by the ring, the vibration of the case 5 can be reduced. The O-ring is a rubber-like elastic body and deforms itself to absorb the energy of vibration of the motor 1.

The motor 1 shown in FIG. 4 reciprocates an inner blade base 10 of an electric razor via a cam shaft 8 fixed to a rotary shaft 1A and a connecting rod 9. The inner blade base 10 is reciprocated in a direction indicated by an arrow A parallel to the paper surface in FIG. Therefore, the motor 1 is also vibrated in the direction indicated by the arrow A. The vibration in the direction orthogonal to the arrow A, that is, the direction indicated by the arrow B in FIG. 3, which is orthogonal to the paper surface in FIG. 4, is much smaller than the vibration in the direction of the arrow A.
Therefore, the O-ring which is the vibration-proof rubber 3 absorbs the vibration in the direction indicated by the arrow A and does not absorb the vibration in the direction indicated by the arrow B. In order to do this, as shown by the chain line in FIG. 3, a groove-shaped pressing portion 7B that directly contacts the connecting member 2 is formed on the bottom surface of the case 5. The pressing portion 7B is formed in a height such that the lower end surface of the connecting member 2 directly contacts with the O-ring housed inside. Although not shown, the pressing portion is also formed in the upper case that presses the upper surface of the connecting member 2 in FIG. 3, and the connecting member 2 is sandwiched between the pressing portions of the lower case and the upper case, so that the motor 1 is mounted on the case. Attach it to the fixed position.

As described above, when the connecting member 2 is directly attached to the case 5 in the direction of less vibration, the motor 1 can be reliably supported. However, the connecting member 2
Attach the entire outer circumference of the case to the case 5 via the O-ring,
It goes without saying that the O-ring can also absorb the vibrations in the directions indicated by arrows A and B.

[0018]

EFFECTS OF THE INVENTION The portable electric device of the present invention does not use a vibration-proof rubber specially molded by using a mold as in the prior art, but uses an O-ring, which is often used as a packing, as a vibration-proof rubber. use. The O-ring has a watertight structure for various devices,
Or it is a general-purpose part that is mass-produced as packing to make an airtight structure. O-rings with different thicknesses and sizes are mass-produced at low cost as standard products so that the O-rings can be used in an optimal state for various applications and models. Further, the O-ring is a part used for a packing having a watertight or airtight structure, is required to have excellent durability, and is made of high quality rubber. Therefore, the portable electric device of the present invention, which uses the O-ring as the anti-vibration rubber, can reduce the cost of the anti-vibration rubber. Moreover, there is a feature that it can be prevented in a state where there is little change over time.

Furthermore, since the portable electric device of the present invention uses an O-ring having a circular cross-sectional shape as a vibration isolating rubber,
It has the feature that vibration of the motor can be effectively prevented. Furthermore, the O-ring absorbs the dimensional error of the O-ring mounting part,
There is also a feature that the motor can be securely attached to the case without playing. This is because an O-ring having a circular cross section is easily deformed when the amount of deformation is small, so that some dimensional error can be absorbed by the O-ring being deformed. Therefore, the O-ring has an excellent feature that the motor is attached to the case so that there is no gap between the connecting member of the motor and the case attachment, so that the vibration and the noise can be reduced.

Further, in the portable electric device of the present invention, by using the O-ring as the vibration isolating rubber, the mold for molding the vibration isolating rubber dedicated to the electric device is omitted. The mold for molding the anti-vibration rubber is considerably expensive. The mold for molding the vibration-proof rubber requires a model change of the electric device or a dedicated mold for different models, which makes the manufacturing cost considerably high. On the other hand, the portable electric device of the present invention uses O-rings of various shapes and commercially available as general-purpose parts for the anti-vibration rubber, so the model is changed or various electric devices are designed. However, there is no need to manufacture an expensive mold, and the mold cost can be eliminated. Synergistically, a mold is not required and mass production is performed, so that the portable electric device according to the present invention can significantly reduce the cost of the anti-vibration rubber for preventing the vibration of the motor.

Further, in the portable electric device of the present invention, since the O-ring has a dimensional standard and various types are commercially available, it is not necessary to prepare a special anti-vibration rubber as a repair part. Therefore, the maintenance parts can be easily supplied, and the maintenance parts can be remarkably inexpensive.

As described above, the portable electric device according to the present invention has the durability because the vibration proof rubber effectively prevents the vibration of the motor even though the vibration proof rubber can be remarkably inexpensive. It realizes various ideal features that are convenient for maintenance.

[Brief description of drawings]

FIG. 1 is a plan view showing a motor mounting portion of a conventional portable electric device.

FIG. 2 is a cross-sectional view showing a motor mounting portion of the portable electric device shown in FIG.

FIG. 3 is a perspective view showing a motor mounting portion of a portable electric device according to an embodiment of the present invention.

FIG. 4 is a horizontal sectional view of the motor mounting portion shown in FIG.

5 is an enlarged cross-sectional view of the O-ring portion of FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Motor 1A ... Rotating shaft 2 ... Connecting member 2A ... Fitting part 3 ... Anti-vibration rubber 4 ... Recessed part 5 ... Case 6 ... Screw 7 ... Connecting wall 7A ... Groove 7B ... Pressing part 8 ... Cam shaft 9 ... Connecting rod 10 ... Inner blade

Claims (1)

[Claims] 1. A portable electric device having a built-in motor (1), wherein the motor (1) is attached to the case (5) through a vibration-proof rubber (3), and the motor (1) is attached to the case (5). A fitting portion (2A) for mounting an O-ring is provided on the outer periphery of the connecting member (2) fixed to the motor. The O-ring mounted on the fitting portion (2A) is used as a vibration-proof rubber (3) for the motor. A portable electric device with a built-in motor, characterized in that (1) is fixed to a case (5).