JP2010036282A - Power tool - Google Patents

Abstract

【Task】
The fixed gear, which is a component part of the speed reduction mechanism, is divided into a fixed gear support and a fixed gear, and is arranged in a hammer case, resulting in a large number of parts and large dimensions. End up.
[Solution]
Driven via the speed reduction mechanism, and a speed reduction mechanism comprising a motor, a housing for housing the motor, a pinion connected to the motor, a planetary gear meshing with the pinion, and a fixed gear meshing with the planetary gear In a power tool having a spindle and a tip tool connected to the spindle, the housing fixed gear is integrally formed.
[Selection] Figure 1

Description

  The present invention relates to a power tool having a speed reduction mechanism.

  A conventional impact tool will be described with reference to FIG. FIG. 2 is a structural sectional view of a conventional impact tool main body using a storage battery as a power source. Generally, in a housing 6 or a hammer case 7 that forms an impact tool body, a motor 8 that is a drive source, a speed reduction mechanism that transmits rotational power of a pinion 9 that is an output shaft of the motor 8, and a speed reduction mechanism A spindle 2 that transmits rotational power from the shaft, a hammer 12 that is rotatable through a steel ball 11 inserted in a cam groove formed in the spindle 2 and that is movable in the direction of the rotation axis, and a plurality of claws provided on the hammer 12 An anvil 1 having a blade portion that is struck and rotated by a portion and a spring 13 that always insulates the hammer 12 toward the anvil 1 side are accommodated.

  The speed reduction mechanism unit includes a fixed gear support 14, a fixed gear 15, a planetary gear 10, and a spindle 2 that are supported by a rotation stopper in the housing 6, and the planetary gear that is supported by the spindle 2. 10 has a needle pin 16 serving as a rotating shaft, and the planetary gear 10 and the needle pin 16 constitute a part of the spindle 2.

  One end of the spindle 2 is supported by a bearing, and the other end has a shaft projection, and is rotatably supported in a central hole of the anvil 1 that is rotatably supported by a metal bearing 17. Yes.

  A pulse-like impact (impact) applied to a screw, bolt, or the like that is tightened by the tip tool 4 supplies electric power from the storage battery 5 to the motor 8 by operating the trigger switch 19 and rotates the motor 8. 8 is transmitted to the planetary gear 10 through the pinion 9 connected to the tip of the motor 8, and the rotational power of the pinion 9 is engaged with the spindle 2 through the needle pin 16 by the meshing of the planetary gear 10 and the fixed gear 15. And the rotational force of the spindle 2 is transmitted to the hammer 12 via the steel ball 11 disposed between the cam groove 2a of the spindle 2 and the cam groove 12b of the hammer 12, and the planetary gears 10 of the hammer 12 and the spindle 2 are transmitted. Is biased forward by a spring 13 disposed between the two. This occurs when the claws of the hammer 12 strike the blades of the anvil 1 by rotation.

  After the impact, when the impact energy of the hammer 12 is reduced and the torque of the anvil 1 is reduced, the hammer 12 repels from the anvil 1, so that the hammer 12 moves in the direction of the planetary gear 10 along the cam groove. Before the hammer 12 hits the stopper 18, the hammer 12 is pushed back along the cam groove again in the direction of the anvil 1 by the compression force of the spring 13, and further, the steel disposed between the cam groove of the spindle 2 and the cam groove of the hammer 12. The hammer 12 is accelerated by the rotation of the spindle 2 through the ball 11. Since the spindle 2 keeps rotating while the hammer 12 reciprocates along the cam groove between the hammer 12 and the stopper 18, the claw portion of the hammer 12 gets over the blade portion of the anvil 1, and the claw portion of the hammer 12 again becomes the portion of the anvil 1. When hitting the blade, the anvil 1 is hit with the hammer 12 rotated 180 °. In this way, by repeatedly hitting the anvil 1 by the axial movement and rotation of the hammer 12, the screws and bolts are tightened while continuously applying impact torque.

  The impact tool constructed as described above has a wide variety of uses and is used by many users. In particular, there is a strong demand for reduction in size and weight for light load work.

JP 2004-174635 A

  In the conventional impact tool configured as described above, the fixed gear, which is one component of the speed reduction mechanism, is divided into a fixed gear support and a fixed gear, and further arranged in a hammer case. As a result, the number of parts is large and the dimensions are large.

  The object of the present invention is to solve the above problems and provide a small and lightweight impact tool.

  The above object is achieved by: a speed reduction mechanism portion including a motor, a housing for housing the motor, a pinion connected to the motor, a planetary gear meshing with the pinion, a fixed gear meshing with the planetary gear, and a speed reduction mechanism portion In the electric power tool having a spindle driven through a spindle and a tip tool connected to the spindle, the housing can be achieved by integrally forming the fixed gear.

  Since the component having two functions is configured by one component, the number of components can be reduced, and thus a small and lightweight electric tool can be provided.

  An embodiment of the present invention will be described below with reference to FIG. The impact mechanism using the storage battery as the power source is as described in the background art. FIG. 1 is a side sectional view of an impact tool showing an embodiment of the present invention.

  The speed reduction mechanism and the striking mechanism are housed in the hammer case 7. Rotational power is transmitted by engaging a pinion 9 press-fitted into the motor shaft with a planetary gear 10 having a needle pin 16 pivotally supported by the spindle 2 as a rotation shaft, and the planetary gear 10 is integrally formed with the hammer case 7. The fixed gear portion 7a is engaged, the spindle 2 is rotatable, and is transmitted to the anvil 1 which is the final output shaft via the hammer 12.

  Thus, the fixed gear 10 and the hammer case 7 shown in the prior art are integrated, and the gear portion 7a is provided, so that the size can be reduced, and the weight can be reduced by reducing the number of parts.

It is side surface sectional drawing of the impact tool which shows embodiment of this invention. It is side surface sectional drawing of the impact tool which shows the prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Anvil, 2 Spindle, 6 Housing, 7 Hammer case, 7a Gear part, 8 Motor, 9 Pinion, 10 Planetary gear, 11 Steel ball, 12 Hammer, 13 Spring, 14 Fixed gear support, 15 Fixed gear, 16 Needle pin , 17 Metal bearing, 18 Stopper

Claims (2)

A motor,
A housing for housing the motor;
A reduction mechanism comprising a pinion connected to the motor, a planetary gear meshing with the pinion, and a fixed gear meshing with the planetary gear;
A spindle driven via a speed reduction mechanism,
A power tool having a tip tool connected to the spindle;
An electric tool characterized in that the fixed gear is integrally formed in a housing. The housing includes
An anvil extending to the spindle;
A striking mechanism for striking the anvil in the rotational direction of the spindle and holding the tip tool;
Is housed,
The housing has a hammer case that covers the striking mechanism and the speed reduction mechanism,
The electric tool according to claim 1, wherein the fixed gear is formed integrally with the hammer case.

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