JP2006281441A - Power tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power tool effectively reducing noise by an inexpensive and simple constitution. <P>SOLUTION: The power tool is provided with: a motor 6; a deceleration mechanism part 7 for transmitting rotation power of the motor 6; a hitting mechanism 8 for converting the rotation power of the deceleration mechanism 7 to hitting force; a two-split housing 1 provided with a first elastic body on an outer surface by a two-layer molding and storing the motor 6 and the deceleration mechanism part 7 at the inside; and a hammer case 2 for storing the hitting mechanism part 8 adjacent to the two-split housing 1. A second elastic body is provided on an abutment part of a surface of an inner side of the two-split housing 1 with the deceleration mechanism part 7 by two-layer molding. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an anti-vibration structure for a power tool.

  A conventional vibration-proof structure of an electric tool will be described with reference to FIGS. FIG. 7 is a side view showing a conventional split housing of an electric power tool, and FIG. 8 is a front view showing one of the split housings shown in FIG. 7 and 8, contact portions 21, 22, and 23 made of a soft material are provided on the surface of the split housing. This abutting portion improves the operability and workability by improving the anti-slip function for gripping the electric tool reliably by the operator, or improving the gripping comfort. It also prevents the power tool from being damaged by absorbing the impact when dropped on the ground, and prevents the power tool from slipping along the slope when the power tool is placed on an inclined surface. is there. For this reason, the abutting portion is mainly provided on the handle grip portion 21, the trunk portion rear surface 22, and the storage battery housing portion periphery 23 of the split housing.

  The soft material is provided for the purpose of operability of the electric tool and protection of the tool grounding surface, but is not provided in consideration of vibration proofing or sealing performance of the electric tool. Therefore, in order to ensure vibration proofing and sealing properties, it is necessary to separately provide components such as a damper and packing, which increases the cost.

  An object of the present invention is to provide an electric tool capable of solving the above-described problems and absorbing vibration and securing a sealing property by an elastic body such as a rubber member formed on the surface of a housing by two-layer molding.

  The object is to provide a motor, a speed reduction mechanism that transmits the rotational power of the motor, a striking mechanism that converts the rotational power of the speed reduction mechanism into a striking force, and a first elastic body formed by two-layer molding on the outer surface. And a hammer case for housing the striking mechanism adjacent to the split housing, the split housing being provided with a split housing that houses the motor and the speed reduction mechanism. This is achieved by providing a second elastic body by two-layer molding at the abutting portion with the speed reduction mechanism portion on the inner surface.

  According to the present invention, when the two-layer molding process is performed on the housing of the electric tool with an elastic body such as a rubber member, the two-layer molding process is performed on the contact surface of the hammer case, the rechargeable battery, or the like with the part to be joined. By doing so, a damper and a sealing property can be added without using new parts, and the life and operability of the product body can be improved.

  In addition, by performing a two-layer molding process on the concave groove that fits into the convex flange disposed in the housing mating part, further damper and sealing effects due to the increase in the contact area between the two can be obtained. It is done.

  Hereinafter, the electric tool in a present Example is demonstrated using FIGS. FIG. 1 is a cross-sectional view showing a battery-type rotary impact tool in this embodiment. The battery-type rotary impact tool includes a housing 1 as an outer frame, a hammer case 2, a rechargeable battery 3 as a power source, and a switch for driving a main body. 4. Switch terminal unit 5 serving as a contact point with the rechargeable battery 3, motor unit 6 serving as a drive source, a speed reduction mechanism 7 for decelerating the rotation output from the motor unit 6, and a rotation output from the speed reduction mechanism 7 being converted into a rotation hit A rotary striking mechanism 8 is provided.

  2 is a front view of FIG. 1 showing a housing 1 subjected to a two-layer molding process with an elastic body (elastic rubber) such as a rubber member, and FIG. 3 is a side view of FIG. Note that the hatched portion in the figure indicates a portion subjected to a two-layer molding process with an elastic body such as a rubber member. 2 and 3, the contact surface 11 between the housing 1 and the hammer case 2 is subjected to a two-layer molding process, and an axial direction generated when the rotary impact mechanism 7 is struck by the applied elastic body. Vibration can be mitigated. Further, by ensuring the airtightness between the housing 1 and the hammer case 2, it is possible to prevent the lubricant such as grease filled in the speed reduction mechanism 6 and the rotary impact mechanism 7 from leaking out of the housing 1. Can do.

  In addition, the battery insertion part 12 of the housing 1, the switch holding part 13, the fitting part 14 with the speed reduction mechanism 6, and the mating part 15 between the housing 1 and the other half of the housing are subjected to a two-layer molding process, which occurs at the time of impact. To prevent wear caused between the housing 1 and the rechargeable battery 3 due to the vibration and the conduction failure due to the generation of oxide due to chattering due to the vibration between the switch terminal 5 and the terminal of the rechargeable battery 3. The life of the housing 1 and the rechargeable battery 3 can be improved.

  Further, the two-layer molding process to the fitting portion 14 with the speed reduction mechanism 7 in the housing 1 is performed as shown in FIGS. 4 and 5, and the inner cover circumferential stop portion 16 in the speed reduction mechanism 7 and the abutting portion 17 with the housing 1. It is given to the side part 18. Thereby, an anti-vibration effect can be obtained with respect to vibrations in both directions of the shaft and the diameter generated at the time of hitting by the rotary hitting mechanism 7.

  In addition, the two-layer molding process for the switch holding portion 13 of the housing 1 is caused by the continuity failure caused by the displacement of the contact portion of the switch 4 due to wear due to the vibration generated at the time of hitting by the rotary hitting mechanism 7. Can be prevented and the life of the switch can be improved.

  FIG. 6 is a side view of the mating portion of the housing 1, which is an elastic body such as a rubber member that has been subjected to two-layer molding processing on the mating portion, and has a convex collar 19 on one side and a convex collar on the other side. By increasing the contact area by providing the concave groove 20 to be fitted, vibration can be reduced and grease leakage at the mating portion can be prevented.

It is sectional drawing which shows the battery-type rotary impact tool which becomes this invention. It is a front view which shows the split housing of the battery-type rotary impact tool shown in FIG. FIG. 3 is a side view of the split housing shown in FIG. 2. It is a vertical side view which shows the mating surface of the deceleration mechanism and split housing which become this invention. FIG. 5 is a side view of FIG. 4. It is a principal part enlarged view which shows the mating surface of the split housing which becomes this invention. It is a side view which shows the split housing of the conventional battery-type rotary impact tool. It is a front view of the split housing shown in FIG.

Explanation of symbols

1 is a housing, 2 is a hammer case, 3 is a rechargeable battery, 4 is a switch, 5 is a switch terminal, 6 is a motor, 7 is a speed reduction mechanism, 8 is a rotary striking portion, 11 is a joint between the housing and the hammer case, 12 Is a rechargeable battery insertion portion of the housing, 13 is a joint portion of the housing and the switch, 14 is a fitting portion of the housing and the speed reduction mechanism, 15 is a fitting portion of the split housing, 16 is a stop portion around the speed reduction mechanism, 17 is a speed reduction mechanism The abutting portion, 18 is a speed reducing mechanism side surface portion, 19 is a convex collar, 20 is a concave groove, 21 is a handle grip portion, 22 is a rear surface of the body portion, and 23 is a side abutting surface.

Claims (3)

A motor,
A speed reduction mechanism for transmitting the rotational power of the motor;
A striking mechanism for converting the rotational power of the speed reduction mechanism to striking force;
A first elastic body is provided on the outer surface by two-layer molding, and a split housing that houses the motor and the speed reduction mechanism portion on the inner side,
A hammer case that accommodates the striking mechanism adjacent to the split housing;
In the electric tool with
A power tool characterized in that a second elastic body is provided by a two-layer molding at a contact portion of the inner surface of the split housing with the speed reduction mechanism. The power tool according to claim 1, wherein a third elastic body is provided by a two-layer molding at a contact portion of the split housing with the hammer case. The electric tool according to claim 1, wherein a fourth elastic body is provided in the abutting portion of the split housing by two-layer molding.