JP6792627B2 - Electric tool - Google Patents

Description

The present invention relates to a power tool.

Conventionally, when installing a tip tool (for example, a saw blade), an operator has been on a rotational force transmission path that transmits a rotational force from a motor in order to prevent free rotation of the output shaft to which the tip tool is attached. There is known an electric tool provided with a spindle lock that shuts off the rotational force from the motor by operating from the outside (see Patent Document 1).

Japanese Unexamined Patent Publication No. 2004-225642

However, in the power tool having the above configuration, the operator fixes the tip tool to the output shaft while operating the spindle lock at the time of attaching or detaching the tip tool (clamping tool). For example, it was troublesome because it was necessary to turn a bolt).

Therefore, an object of the present invention is to provide an electric tool capable of easily exchanging a tip tool without performing an operation of fixing the output unit.

A motor, a rotating shaft that extends in a predetermined direction and is rotated by the motor, an output unit that rotates by transmitting the rotational force of the rotating shaft, and a tip tool can be attached and detached, and the rotation in the predetermined direction. Provided is an electric motor, which is located at one end of a shaft and has a regulating member for restricting the rotation of the rotating shaft so as to be able to transmit rotation in only one of the forward and reverse directions.

According to the power tool having the above configuration, the regulating member supports the rotation shaft that transmits the rotational force to the output unit so as to be able to transmit rotation in only one of the forward and reverse directions. Therefore, only rotation of the output unit in one direction is allowed, and rotation in the other direction is restricted. As a result, the operation of fixing the output unit can be omitted, and the tip tool can be easily replaced.

In the above configuration, it is preferable to have a fixing mechanism that regulates the rotation of the output unit in both the forward and reverse directions.

According to such a configuration, the regulating member supports the rotating shaft as a bearing while restricting the rotation of the rotating shaft in the other direction. As a result, it is possible to perform rotation support and rotation regulation of the rotation shaft with a single member, so that a simple and low-cost structure can be achieved without providing new parts.

In the above configuration, it is preferable to further have a deceleration mechanism between the motor and the output unit that decelerates the rotation of the motor and transmits the rotation to the output unit.

Further, it is preferable that the motor has a rotor that rotates integrally with the rotating shaft.

According to such a configuration, by restricting the rotation of the rotating shaft before deceleration, it is possible to restrict the rotation of the output unit by restricting the rotation at a place where the torque is relatively small, and the load applied to the regulating member. It is possible to suppress the problem and extend the life.

Further, the deceleration mechanism is located on the output unit side with respect to the rotor in the predetermined direction, and is located on the output unit side with respect to the rotor in the predetermined direction with the end of the rotation shaft. It is preferable that the gear housing further includes a gear housing that supports the speed reduction mechanism, and the gear housing supports the end portion via the regulation member.

According to such a configuration, since the end portion of the rotating shaft and the reduction mechanism are supported by one gear housing, the total length of the power tool can be suppressed. Further, since the gear housing is formed so as to support the end of the rotating shaft via the regulating member, it is possible to manufacture a gear housing that conforms to the regulation member standard, and a gear that conforms to the regulation member standard. The housing facilitates the assembly of power tools. Further, the regulating member supports the rotating shaft as a bearing while restricting the rotation of the rotating shaft in the other direction. As a result, it is possible to perform rotation support and rotation regulation of the rotation shaft with a single member, so that a simple and low-cost structure can be achieved without providing new parts.

Further, the gear housing is preferably made of metal.

According to such a configuration, the strength of the bearing member arrangement location of the gear housing can be increased as compared with the case of using the resin gear housing, and the power tool can be prevented from being damaged from the regulation member arrangement location. It becomes possible to do.

In the above configuration, the regulating member is preferably a one-way clutch.

According to such a configuration, it is possible to regulate the rotation of the rotating shaft with a relatively simple configuration.

In the above configuration, the motor is preferably a brushless motor.

According to such a configuration, it is possible to reduce the size and weight of the electric tool by adopting a brushless motor that is smaller than the conventional commutator motor.

It also has a housing for accommodating the motor and a base for supporting the housing, the housing comprising a grippable handle, and the regulatory member at a position between the handle and the base. , It is preferable that the housing is provided inside the housing.

Further, the rotor is provided with a fan for cooling the motor, and it is preferable that the handle is located on the radial direction of the regulation member when the radial direction of the fan is the radial direction.
The present invention further includes a motor, a rotating shaft that extends in a predetermined direction and is rotated by the motor, an output unit that rotates by transmitting the rotational force of the rotating shaft, and a tip tool to which the tip tool can be attached and detached. It has a regulating member located at one end of the rotating shaft in the direction of the above, and the regulating member allows rotation in one of the forward and reverse directions of the rotating shaft and rotates in the other direction. Provided is an electric tool forbidden, which functions as a bearing member that rotatably supports the rotating shaft when the rotating shaft rotates in one of the directions.
The present invention further includes a motor, a rotating shaft that extends in a predetermined direction and is rotated by the motor, an output unit that rotates by transmitting the rotational force of the rotating shaft, and a tip tool can be attached and detached, and the output. A metal case that supports the portion and a metal case that is located at one end of the rotation shaft in the predetermined direction and is supported by the metal case that allows rotation in one of the forward and reverse directions and the other. Provided is an electric motor characterized by having a restricting member for prohibiting rotation in the direction of the above.
In the above configuration, the tip tool is fixed to the output unit by a bolt attached to the output unit, and the bolt is rotated in the same direction as the rotation direction of the output unit that rotates the rotation axis in the other direction. It is preferable that the bolt can be screwed and attached to the output portion by rotating the bolt relative to the output portion.
The present invention further includes a motor, a rotating shaft that extends in a predetermined direction and is rotated by the motor, an output unit that rotates by transmitting the rotational force of the rotating shaft, and an output unit to which a tip tool can be attached and detached, and the rotation. It has a deceleration mechanism that decelerates the rotation of the shaft and transmits it to the output unit, and a regulating member located at one end of the rotating shaft in the predetermined direction, and the regulating member has both forward and reverse directions of the rotating shaft. Provided is an electric tool characterized in that rotation in one direction is allowed and rotation in the other direction is prohibited.
In the above configuration, the restricting member rotates the rotating shaft in which the rotation of the output unit is accelerated and transmitted when an external force is applied to the output unit in a direction in which the rotating shaft rotates to the other side. The rotation of the output unit is regulated by regulating.
The present invention further comprises a motor having a rotor, a rotating shaft that extends in a predetermined direction and is rotated integrally with the rotor by the motor, and a tip tool that rotates by transmitting the rotational force of the rotating shaft. A detachable output unit, a deceleration mechanism that decelerates the rotation of the rotating shaft and transmits it to the output unit, a metal case that supports the output unit and accommodates the deceleration mechanism, and the output unit. It has a fixing mechanism that regulates rotation in both forward and reverse directions and a regulating member located at one end of the rotating shaft in the predetermined direction, and the fixing mechanism includes the regulating member and the rotor in the predetermined direction. The rotation of the rotating shaft can be regulated by engaging with the rotating shaft at a position between, and has a spindle lock that can be operated by an operator, and the regulating member is supported by the case. Allows rotation of the rotating shaft in one of the forward and reverse directions and prohibits rotation in the other direction, so that the rotating shaft can rotate when the rotating shaft rotates in the one direction. We provide electric tools that function as bearing members that support the shaft.
In the above configuration, the speed reduction mechanism preferably has an intermediate shaft that transmits the rotation of the rotating shaft to the output unit, and the case preferably supports the intermediate shaft.
Further, it is preferable that the deceleration mechanism is configured to decelerate and transmit the rotation of the rotating shaft to the intermediate shaft and decelerate and transmit the rotation of the intermediate shaft to the output unit.

According to the power tool according to the present invention, it is possible to easily attach or detach the tip tool without performing an operation of fixing the output unit.

It is sectional drawing which shows the internal structure of the housing of the electric circular saw which concerns on 1st Embodiment of this invention. It is the top view which shows the appearance of the electric circular saw which concerns on 1st Embodiment of this invention in the top view, and the engagement mode of the rotation shaft of a motor and a spindle lock in the top view is shown by the cross section. FIG. 2 is a sectional view taken along line LL of FIG. 2, showing a state in which rotation of the rotation shaft of the motor is permitted. It is an enlarged sectional view which shows the gear part of the electric circular saw which concerns on 1st Embodiment of this invention. It is an enlarged cross-sectional view which shows the one-way clutch in the left side view of the electric circular saw which concerns on 1st Embodiment of this invention, and is the figure which shows the state which the forward rotation of the rotation shaft of a motor is allowed by the one-way clutch. It is an enlarged cross-sectional view which shows the one-way clutch in the left side view of the electric circular saw which concerns on 1st Embodiment of this invention, and is the figure which shows the state which the reversal of the rotation axis of a motor is regulated by a one-way clutch. FIG. 2 is a sectional view taken along line LL of FIG. 2, showing a state in which the rotation shaft of the motor is fixed by a spindle lock. It is sectional drawing which shows the internal structure of the housing of the electric circular saw which concerns on 2nd Embodiment of this invention. FIG. 8 is a cross-sectional view taken along the line AA of FIG. 8 showing the structure of a claw clutch. It is a rear view which shows the rear view appearance of the tabletop circular saw which concerns on 3rd Embodiment of this invention, and the internal structure of the housing in the rear view is shown by the cross section. It is sectional drawing which shows the internal structure of the disc grinder which concerns on 4th Embodiment of this invention.

[First Embodiment] Hereinafter, the electric circular saw 1 according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 7. First, the configuration of the electric circular saw 1 will be described with reference to FIGS. 1 to 5. In the following description of the electric circular saw 1, "up" shown in FIG. 1 is defined as upward, "lower" is defined as downward, "right" is defined as right, and "left" is defined as left. In addition, the back of the paper is defined as the rear direction, and the front of the paper is defined as the front.

The electric circular saw 1 is an electric tool for cutting wood or the like (material to be cut). As shown in FIGS. 1 and 2, the electric circular saw 1 includes a housing 2, a handle 3, a motor 4, a gear portion 5, a blade mounting portion 6, a spindle lock 7, and a one-way clutch 8. And a base 9. FIG. 1 is a cross-sectional view showing the internal structure of the housing 2 of the electric circular saw 1 according to the first embodiment of the present invention. FIG. 2 is a top view showing the appearance of the electric circular saw 1 according to the first embodiment of the present invention in a top view, and the engagement mode between the rotation shaft of the motor 4 and the spindle lock 7 in the top view depends on the cross section. It is shown.

As shown in FIG. 1, the housing 2 has a motor housing 21, a gear housing 22, and a cover 23. A base 9 that comes into contact with a material to be cut (wood or the like) during cutting work is provided at the lower right portion of the housing 2. The base 9 represented by the dotted line in FIG. 1 indicates that the base 9 can be tilted with the axis extending in the front-rear direction as the tilt center. Base 9 is an example of a "base" in the present invention. The housing 2 is an example of the "housing" in the present invention.

As shown in FIGS. 1 and 2, the motor housing 21 has a substantially cylindrical shape extending in the left-right direction, and houses the motor 4 and the spindle lock 7 inside.

As shown in FIG. 1, the gear housing 22 extends from the right end of the motor housing 21 to the right, and has a right end portion of the motor 4, a gear portion 5, a left portion of the blade mounting portion 6, and a one-way clutch. It houses 8 and. The gear housing 22 is made of metal (for example, made of aluminum). The gear housing 22 is an example of the “gear housing” in the present invention. The right end of the motor 4 is an example of the "end" in the present invention.

The cover 23 is made of resin (for example, made of plastic) and extends from the lower portion of the gear housing 22 to the right to accommodate the right portion of the blade mounting portion 6.

The handle 3 is a portion to be gripped by the operator when using the electric circular saw 1, and extends in the front-rear direction above the housing 2. The handle 3 is provided with a trigger (not shown) for driving the motor 4. The handle 3 is an example of the "handle" in the present invention.

The motor 4 is a DC brushless motor and has a rotating shaft 41 and a rotor 42. The motor 4 is an example of the "motor" and the "brushless motor" in the present invention. The rotating shaft 41 is an example of the "rotating shaft" in the present invention.

As shown in FIG. 1, the rotating shaft 41 extends in the left-right direction and is rotatably supported by the housing 2 with the axis A as the rotating axis via the first bearing 46 and the one-way clutch 8. There is. A pinion 43 is provided on the right side of the rotating shaft 41. The rotation shaft 41 and the pinion 43 rotate integrally. A rotation restricting portion 44 is provided on the left portion of the rotating shaft 41. A fan 45 that rotates coaxially with the rotating shaft 41 and cools the motor 4 is fixed to the left side of the contra-rotating part 44. The one-way clutch 8 has a circular shape and is arranged so as to be substantially parallel to the circular fan 45. That is, the radial direction of the one-way clutch 8 is parallel and the same direction as the radial direction of the fan 45. Here, the axis A shown in the figure is a virtual axis of rotation extending in the left-right direction through the center of the rotation axis 41 in the right side view. The left-right direction is an example of the "predetermined direction" in the present invention. The fan 45 is an example of a "fan" in the present invention.

The rotation-restricted portion 44 extends in the left-right direction and the up-down direction, and is provided between the one-way clutch 8 and the fan 45 in the left-right direction. As shown in FIG. 3, the rotation-restricted portion 44 has a first engaging surface 44A and a second engaging surface 44B. FIG. 3 is a cross-sectional view taken along the line LL of FIG. 2, showing a state in which the rotation shaft 41 of the motor 4 is allowed to rotate.

The first engaging surface 44A is a flat surface substantially orthogonal to the vertical direction. The second engaging surface 44B is a flat surface substantially orthogonal to the vertical direction, and is formed substantially parallel to the first engaging surface 44A. The first engaging surface 44A is located above the second engaging surface 44B.

The rotor 42 is formed in a tubular shape extending in the left-right direction. The rotor 42 is coaxially fixed to the rotating shaft 41, and rotates integrally with the rotating shaft 41 with the axis A as the rotating axis. The rotor 42 is an example of the "rotor" in the present invention.

As shown in FIG. 1, the gear portion 5 is located in the gear housing 22 and is provided on the rotational force transmission path from the motor 4 to the blade mounting portion 6 to reduce the rotation of the rotating shaft 41. It is configured so that it can be transmitted to the blade mounting portion 6. Further, the gear portion 5 is located on the output portion side with respect to the rotor. As shown in FIG. 4, the gear portion 5 includes a first gear 51, a second gear 52, a third gear 53, an intermediate shaft 54, a second bearing 55, and a third bearing 56. Have. FIG. 4 is an enlarged cross-sectional view showing the gear portion 5 of the electric circular saw 1 according to the first embodiment of the present invention. In FIG. 4, the gear housing 22 is hatched with diagonal lines from the upper right to the lower left, and the cover 23 is hatched with diagonal lines from the upper left to the lower right. The gear portion 5 is an example of the "reduction mechanism" in the present invention.

The intermediate shaft 54 extends in the left-right direction and is rotatably supported by the gear housing 22 and the cover 23 with the axis B as the rotation axis via the second bearing 55 and the third bearing 56. Here, the axis B shown in the drawing is a virtual rotation axis B extending in the left-right direction through the center of the intermediate shaft 54 in the right side view. The axis B is substantially parallel to the axis A.

The first gear 51 meshes with the pinion 43 of the motor 4. The first gear 51 is fixed to the intermediate shaft 54 by press fitting. The first gear 51 rotates integrally with the intermediate shaft 54 with the axis B as the rotation axis. The outer diameter of the first gear 51 is larger than the outer diameter of the pinion 43.

The second gear 52 is located to the right of the first gear 51 and is fixed to the intermediate shaft 54 by press fitting. The second gear 52 rotates integrally with the intermediate shaft 54 and the first gear 51 with the axis B as the rotation axis.

The third gear 53 is located below the second gear 52. The outer diameter of the third gear 53 is larger than the outer diameter of the second gear 52.

As shown in FIG. 1, the blade mounting portion 6 extends from the lower portion of the gear housing 22 to the right, and the blade P is detachably configured. The blade mounting portion 6 has an output portion 61, a socket 62, a blade fixing cover 63, and a bolt 64.

As shown in FIG. 4, the output unit 61 has a substantially cylindrical shape extending in the left-right direction, and is configured so that the bolt 64 can be fastened substantially in the center in the radial direction. The output unit 61 is rotatably supported by the gear housing 22 and the cover 23 with the axis C as the rotation axis via the fourth bearing 65 and the fifth bearing 66. A third gear 53 of the gear portion 5 is fixed to the right portion of the output portion 61 by press fitting. The output unit 61 rotates integrally with the third gear 53 with the axis C as the rotation axis. The output unit 61 is an example of the “output unit” in the present invention.

The socket 62 shown in FIG. 1 is made of metal, and the output unit 61 is fixed by press fitting or the like. The socket 62 has a body portion 62A and a protruding portion 62B.

The body portion 62A is formed in a tubular shape extending in the left-right direction.

The protruding portion 62B projects outward from the right end of the body portion 62A in the radial direction of the body portion 62A. The protrusion 62B has a right-sided ring-shaped contact surface 62C that is orthogonal to the left-right direction. The inner diameter of the contact surface 62C is substantially the same as the inner diameter of the blade P formed in a ring shape.

The blade fixing cover 63 is made of resin and has an annular portion 63A and a fixing portion 63B.

The annular portion 63A is formed in the shape of a ring on the right side.

The fixed portion 63B projects to the left and outward in the radial direction from the radial outer end of the annular portion 63A. The fixed portion 63B has a right-side view ring shape and a contact surface 63C orthogonal to the left-right direction. The inner diameter of the contact surface 63C is substantially the same as the inner diameter of the blade P formed in a ring shape. As shown in FIG. 1, the contact surface 63C is configured to be located at a position facing the contact surface 62C in the left-right direction when the bolt 64 is fastened.

As shown in FIG. 1, in a situation where the bolt 64 is fastened to the output unit 61, the bolt 64 extends in the left-right direction. The bolt 64 has a hexagonal head 64A when viewed from the right side so that the operator can fasten it from the outside.

The spindle lock 7 shown in FIGS. 2 and 3 is a member for restricting the rotation of the rotating shaft 41 when attaching / detaching the blade P to / from the blade mounting portion 6 during non-working. As shown in FIG. 3, the spindle lock 7 has an arm portion 71, a pressed portion 72, a regulating portion 73, and an applied portion 74.

The arm portion 71 is formed in a thin plate shape extending in the front-rear direction, and the front portion thereof projects to the outside of the housing 2.

As shown in FIG. 2, the pressed portion 72 is located at the front end portion of the arm portion 71. The pressed portion 72 extends from the front end portion of the arm portion 71 to the right and has a pressed surface 72A that can be operated from the outside by the operator.

As shown in FIG. 3, the regulation unit 73 extends in the front-rear direction and has a first regulation surface 73A and a second regulation surface 73B.

The first regulation surface 73A is a flat surface substantially orthogonal to the vertical direction. The second regulation surface 73B is a flat surface substantially orthogonal to the vertical direction, and is formed substantially parallel to the first regulation surface 73A. The first regulatory surface 73A is located above the second regulatory surface 73B. Further, the distance between the first regulation surface 73A and the second regulation surface 73B and the distance between the first engagement surface 44A and the second engagement surface 44B of the rotation-restricted portion 44 of the motor 4 are It is configured almost the same.

The urging portion 74 extends in the front-rear direction and is in contact with the spring 2A at its front end.

The arm portion 71, the pressed portion 72, the restricting portion 73, and the pressed portion 74 are integrally formed, and the pressed portion 72 is pressed backward by the operator to be integrally rearward. It is configured to be movable.

The one-way clutch 8 allows (transmits) forward rotation of the rotating shaft 41 and the pinion 43 that rotates integrally with the rotating shaft 41 (rotation in the clockwise direction in FIG. 5, the same applies hereinafter in the first embodiment) and reverse rotation. It is a member that regulates (rotation in the counterclockwise direction in FIG. 5, the same applies hereinafter in the first embodiment). The one-way clutch 8 is provided between the inner wall of the gear housing 22 and the rotating shaft 41 of the motor 4. The one-way clutch 8 is provided between the handle 3 and the base 9 in the vertical direction, and the handle 3 is located on the radial direction of the one-way clutch 8. In other words, the one-way clutch 8 and the handle 3 are substantially on the same plane in a virtual plane extending up, down, front and back. The one-way clutch 8 is located at the right end of the rotating shaft 41. The one-way clutch 8 has a tubular portion 81, a plurality of rollers 82, and a plurality of springs 83. FIG. 5 is an enlarged cross-sectional view showing the one-way clutch 8 in the rear view of the electric circular saw 1 according to the first embodiment of the present invention, and the one-way clutch 8 allows the rotating shaft 41 of the motor 4 to rotate in the normal direction. It is a figure which shows the state which is. In FIG. 5, the rotating shaft 41 of the motor 4 is hatched with diagonal lines from the upper right to the lower left, and the gear housing 22 is hatched with the diagonal lines from the upper left to the lower right. The one-way clutch 8 is an example of the "regulatory member", the "bearing member" and the "one-way clutch" in the present invention. The right end of the rotating shaft 41 is an example of "one end of the rotating shaft" in the present invention. Forward rotation is an example of "rotation in one of both forward and reverse directions" in the present invention.

As shown in FIG. 1, the tubular portion 81 has a tubular shape extending in the left-right direction, and is fixed to the inner wall of the gear housing 22 by press fitting. As shown in FIG. 5, a plurality of accommodating grooves 81a are formed on the inner peripheral surface of the tubular portion 81. The accommodating groove 81a is a groove formed by being recessed outward in the radial direction of the tubular portion 81 from the inner peripheral surface of the tubular portion 81, and extends in the left-right direction. A pair of rollers 82 and one set of springs 83 are housed in each of the plurality of housing grooves 81a.

The roller 82 is a needle-shaped roller extending in the left-right direction, and is accommodated in the accommodating groove 81a in a state where it can rotate about its own axis and is in contact with the rotating shaft 41. Further, the roller 82 cannot move in the left-right direction inside the accommodating groove 81a and can move a predetermined amount in the circumferential direction of the rotating shaft 41.

The depth of the accommodating groove 81a becomes deeper from the upstream side to the downstream side of the accommodating groove 81a in the normal rotation direction of the rotating shaft 41, and the depth of the upstream side edge portion is smaller than the diameter of the roller 82 and is downstream. The depth of the side edge portion is configured to be larger than the diameter of the roller 82. Further, a spring 83 is provided as an urging member between the roller 82 accommodated in the accommodating groove 81a and the downstream side edge portion of the accommodating groove 81a, and the roller 82 is provided from the downstream side edge portion to the upstream side edge portion. Is being urged towards.

From here, the operation of the electric circular saw 1 at the time of cutting the material to be cut (wood or the like) using the electric circular saw 1 according to the first embodiment will be described with reference to FIGS. 3 to 7.

When performing the cutting work, the operator grips the handle 3 and places the electric circular saw 1 in a state where the base 9 is in contact with the material to be cut. In this state, when a pulling operation is performed on a trigger (not shown) of the handle 3, electric power is supplied to the motor 4 from a power source (not shown), and the motor 4 starts driving. When the motor 4 starts driving, the rotating shaft 41, the rotor 42, and the pinion 43 start normal rotation with the axis A as the rotation axis.

As shown in FIG. 5, when the rotating shaft 41 starts to rotate forward, each of the plurality of rollers 82 in contact with the outer peripheral surface of the rotating shaft 41 has its own accommodating groove 81a. While rotating around its own axis and resisting the urging force of the spring 83, the rotation shaft 41 starts moving from the upstream side edge portion to the downstream side edge portion in the normal rotation direction. When the roller 82 is located at the downstream side edge portion where the depth of the accommodating groove 81a is the deepest, the contact surface pressure between the outer peripheral surface of the rotating shaft 41 and the roller 82 becomes small. The frictional force between each roller 82 and the outer peripheral surface of the rotating shaft 41 due to the contact surface pressure in this state does not prevent the rotating shaft 41 from rotating normally with respect to the tubular portion 81, and in this state, the rotating shaft 41 Can continue to rotate forward. That is, the one-way clutch 8 allows the rotating shaft 41, the rotor 42, and the pinion 43 to rotate in the forward direction.

In this state, the first gear 51 that meshes with the pinion 43 starts reversing with the axis B as the rotation axis. As a result, the first gear 51, the second gear 52, and the intermediate shaft 54 are integrally reversed with the axis B as the rotation axis. Here, as shown in FIG. 4, since the outer diameter of the first gear 51 is larger than the outer diameter of the pinion 43, the first gear 51, the second gear 52, and the intermediate shaft 54 The rotation speed is smaller than the rotation speed of the pinion 43.

In this state, the third gear 53 that meshes with the second gear 52 starts normal rotation with the axis C as the rotation axis. As a result, the third gear 53 and the output unit 61 rotate in a normal direction integrally with the axis C as the rotation axis. Here, since the outer diameter of the third gear 53 is larger than the outer diameter of the second gear 52, the rotation speed of the third gear 53 and the output unit 61 is higher than the rotation speed of the second gear 52. It becomes smaller. That is, the rotation of the rotating shaft 41 is decelerated twice and transmitted to the output unit. This makes it possible to generate a high torque in the output unit 61.

In this state, as the output unit 61 rotates, the blade P fixed to the blade mounting unit 6 rotates to cut the material to be cut.

Further, the work of attaching / detaching (replacement) the blade P of the electric circular saw 1 by the operator will be described with reference to FIGS. 5 to 7.

First, the work of removing the blade P of the electric circular saw 1 by an operator will be described.

When performing the removal work, the operator presses the pressed surface 72A of the spindle lock 7 backward. As a result, the spindle lock 7 moves backward.

As shown in FIG. 7, as the spindle lock 7 moves backward, the first engagement surface 44A of the rotated control portion 44 of the rotating shaft 41 and the first regulation of the regulation portion 73 of the spindle lock 7 It faces the surface 73A at substantially the same position in the vertical direction. Similarly, the second engaging surface 44B and the second regulating surface 73B face each other at substantially the same position in the vertical direction. As a result, the rotation of the rotating shaft 41 is restricted.

In this state, the operator rotates the bolt 64 in the direction of loosening the fastening (forward rotation direction) by using a tool (spanner or the like) (not shown) while pressing the pressed surface 72A of the spindle lock 7 backward. Let me. In this state, the output unit 61 tries to rotate in the normal direction, but since the rotation of the rotating shaft 41 is restricted, the rotation of the first gear 51, the second gear 52, and the intermediate shaft 54 is restricted, and the output unit 61 and the output unit 61 The rotation of the output unit 61 is restricted by restricting the rotation of the third gear 53 that rotates integrally. As a result, the operator can loosen the fastening of the bolt 64 and remove the blade P from the blade mounting portion 6 by using a tool (spanner or the like) (not shown). The spindle lock 7 and the rotation-restricted portion 44 are examples of the "fixing mechanism" in the present invention.

Next, the work of attaching the blade P of the electric circular saw 1 by the operator will be described.

When performing the mounting work, the operator uses a tool (spanner or the like) (not shown) to rotate the bolt 64 in the tightening direction (reverse direction). In this state, the rotating shaft 41 starts reversing as the output unit 61 tries to reverse.

As shown in FIG. 6, when the rotating shaft 41 starts to reverse, each of the plurality of rollers 82 rotates and springs about its own axis inside each accommodating groove 81a in which the self is accommodated. While resisting the urging force of 83, the rotation shaft 41 starts moving from the downstream side edge portion to the upstream side edge portion in the normal rotation direction. When the roller 82 is located at the upstream side edge portion where the depth of the accommodating groove 81a is the shallowest, the contact surface pressure between the outer peripheral surface of the rotating shaft 41 and the roller 82 becomes the largest. In this state, the frictional force between each roller 82 and the outer peripheral surface of the rotating shaft 41 due to the contact surface pressure becomes maximum, and the rotating shaft cannot be reversed with respect to the tubular portion 81. That is, the one-way clutch 8 regulates the reversal of the rotating shaft 41, the rotor 42, and the pinion 43. In this state, since the reverse rotation of the rotating shaft 41 is regulated, the normal rotation of the first gear 51, the second gear 52, and the intermediate shaft 54 is regulated, and the reverse rotation of the third gear 53 that rotates integrally with the output unit 61 is restricted. Is regulated so that the reversal of the output unit 61 is regulated. As a result, the operator can easily attach the blade P without performing the operation of fixing the output unit 61. FIG. 6 is an enlarged cross-sectional view showing the one-way clutch 8 in the rear view of the electric circular saw 1 according to the first embodiment of the present invention, and the one-way clutch 8 regulates the reversal of the rotating shaft 41 of the motor 4. It is a figure which shows the state which is present. In FIG. 6, the rotating shaft 41 of the motor 4 is hatched with diagonal lines from the upper right to the lower left, and the gear housing 22 is hatched with the diagonal lines from the upper left to the lower right.

[Second Embodiment] The electric circular saw 201 according to the second embodiment of the present invention will be described with reference to FIGS. 8 and 9. The same members and the like as in the first embodiment are designated by the same drawing reference numbers, and the description thereof will be omitted. FIG. 8 is a cross-sectional view showing the internal structure of the housing 2 of the electric circular saw 201 according to the second embodiment of the present invention. FIG. 9 is a cross-sectional view taken along the line AA of FIG. 8 showing the structure of the claw clutch.

First, the configuration of the electric circular saw 201 will be described. In the following description of the electric circular saw 201, "up" shown in FIG. 8 is defined as an upward direction, "down" is defined as a downward direction, "right" is defined as a right direction, and "left" is defined as a left direction. In addition, the back of the paper is defined as the rear direction, and the front of the paper is defined as the front.

As shown in FIG. 8, the electric circular saw 201 according to the second embodiment is provided with a bearing 208 that allows the rotation shaft 41 of the motor 4 to rotate in both forward and reverse directions instead of the one-way clutch 8. , The claw clutch 210 is provided on the left side inside the motor housing 21.

The claw clutch 210 shown in FIGS. 8 and 9 is a member located at the left end of the rotating shaft 41 and allows forward rotation of the rotating shaft 41 and the pinion 43 that rotates integrally with the rotating shaft 41, and regulates the reverse rotation. Is. The claw clutch 210 has a claw wheel 210A, a rotation restricting member 210B, and a spring 210C.

As shown in FIG. 9, the claw wheel 210A is formed in a substantially ring shape when viewed from the right side. The rotating shaft 41 of the motor 4 is fixed by press fitting at substantially the center of the claw wheel 210A in the radial direction. The claw wheel 210A and the rotation shaft 41 of the motor 4 can rotate integrally with the axis A as the rotation axis. The claw wheel 210A has a plurality of rotation-controlled surfaces 210D at predetermined intervals in the circumferential direction.

As shown in FIGS. 8 and 9, the rotation restricting member 210B is a member extending in the vertical direction. The rotation restricting member 210B and the claw wheel 210A are in contact with each other below the rotation shaft 41. The rotation regulation member 210B has a rotation regulation surface 210E orthogonal to the front-rear direction.

As shown in FIG. 9, the lower end of the spring 210C abuts on the motor housing 21, the upper end abuts on the lower end of the rotation restricting member 210B, and the rotation restricting member 210B is attached upward with respect to the motor housing 21. It is gaining momentum.

From here, the operation of the electric circular saw 201 at the time of cutting the material to be cut (wood or the like) using the electric circular saw 201 according to the second embodiment will be described.

When performing the cutting operation, the operator grips the handle 3 and places the electric circular saw 201 in a state where the base 9 is in contact with the material to be cut. In this state, when a pulling operation is performed on a trigger (not shown) of the handle 3, electric power is supplied to the motor 4 from a power source (not shown), and the motor 4 starts driving. When the motor 4 starts driving, the rotating shaft 41, the rotor 42, and the pinion 43 start normal rotation with the axis A as the rotation axis. In the second embodiment, the rotation of the rotation shaft 41 in FIG. 9 in the counterclockwise direction is defined as forward rotation, and the rotation in the clockwise direction is defined as reverse rotation.

When the rotating shaft 41 starts normal rotation, the claw wheel 210A starts normal rotation integrally with the rotating shaft 41. With the forward rotation of the claw wheel 210A, friction is generated at the contact point between the claw wheel 210A of the claw clutch 210 and the rotation restricting member 210B. In this state, the rotation restricting member 210B moves downward against the urging force of the spring 210C, so that the contact surface pressure at the contact point between the claw wheel 210A and the rotation restricting member 210B becomes small. As a result, the frictional force acting on the contact point between the claw wheel 210A and the rotation restricting member 210B becomes small, so that the claw wheel 210A can continue to rotate in the normal direction integrally with the rotating shaft 41. That is, the claw clutch 210 allows the rotating shaft 41, the rotor 42, and the pinion 43 to rotate in the forward direction.

In this state, the first gear 51 that meshes with the pinion 43 starts reversing with the axis B as the rotation axis. As a result, the first gear 51, the second gear 52, and the intermediate shaft 54 are integrally reversed with the axis B as the rotation axis. Here, as shown in FIG. 4, since the outer diameter of the first gear 51 is larger than the outer diameter of the pinion 43, the first gear 51, the second gear 52, and the intermediate shaft 54 The rotation speed is smaller than the rotation speed of the pinion 43.

In this state, the third gear 53 that meshes with the second gear 52 starts normal rotation with the axis C as the rotation axis. As a result, the third gear 53 and the output unit 61 rotate in a normal direction integrally with the axis C as the rotation axis. Here, since the outer diameter of the third gear 53 is larger than the outer diameter of the second gear 52, the rotation speed of the third gear 53 and the output unit 61 is higher than the rotation speed of the second gear 52. It becomes smaller. This makes it possible to generate a high torque in the output unit 61.

Further, the installation work of the blade P of the electric circular saw 201 by the operator will be described with reference to FIGS. 8 and 9. Since the removal work of the blade P is the same as that of the electric circular saw 1, the description thereof will be omitted.

When performing the mounting work, the operator uses a tool (spanner or the like) (not shown) to rotate the bolt 64 in the tightening direction (reverse direction). In this state, the rotating shaft 41 starts reversing as the output unit 61 tries to reverse.

When the rotating shaft 41 starts reversing, the claw wheel 210A starts reversing integrally with the rotating shaft 41. With the reversal of the claw wheel 210A, the rotation control surface 210D of the claw wheel 210A and the rotation regulation surface 210E of the rotation regulation member 210B face each other at substantially the same position in the front-rear direction. In this state, since the reversal of the claw wheel 210A is regulated, the reversal of the rotating shaft 41 is regulated. That is, the claw clutch 210 regulates the reversal of the rotating shaft 41, the rotor 42, and the pinion 43. In this state, since the reverse rotation of the rotating shaft 41 is regulated, the normal rotation of the first gear 51, the second gear 52, and the intermediate shaft 54 is regulated, and the reverse rotation of the third gear 53 that rotates integrally with the output unit 61 is restricted. Is regulated so that the reversal of the output unit 61 is regulated. As a result, the operator can easily attach the blade P without performing the operation of fixing the output unit 61.

[Third Embodiment] The tabletop circular saw 301 according to the third embodiment of the present invention will be described with reference to FIG. The same members and the like as in the first embodiment and the second embodiment are designated by the same drawing reference numbers, and the description thereof will be omitted. FIG. 10 is a rear view showing the rear view appearance of the tabletop circular saw according to the third embodiment of the present invention, and the internal structure of the housing in the rear view is shown by a cross section.

First, the configuration of the desktop circular saw 301 will be described. In the following description of the desktop circular saw 301, "up" shown in FIG. 10 is defined as an upward direction, "down" is defined as a downward direction, "right" is defined as a right direction, and "left" is defined as a left direction. In addition, the back of the paper is defined as the front direction, and the front of the paper is defined as the rear direction.

The tabletop circular saw 301 is an electric tool for cutting wood or the like (material to be cut) on the tabletop. As shown in FIG. 10, the tabletop circular saw 301 includes a housing 302, a handle 303 that the operator grips during work, a motor 304, a gear portion 305, and a blade mounting portion 306 to which the blade Q can be attached and detached. A spindle lock 307, a one-way clutch 308, a base portion 309 for placing a material to be cut (wood or the like) during cutting work, and a pulley mechanism 310 for transmitting the rotational force of the motor 304 to the gear portion 305. Have.

The housing 302 includes a motor housing 302A that houses the motor 304, a gear housing 302B, and a cover 302C.

The gear housing 302B extends downward from the lower end of the right portion of the motor housing 302A, and accommodates the gear portion 305, the right portion of the blade mounting portion 306, and the one-way clutch 308. The gear housing 302B is made of metal (for example, made of aluminum).

The cover 302C is made of resin (for example, made of plastic) and extends from the lower portion of the gear housing 302B to the left to accommodate the right portion of the blade mounting portion 306.

The handle 303 is a portion to be gripped by the operator when using the tabletop circular saw 301, and extends in the front-rear direction above the housing 302. The handle 303 is provided with a trigger (not shown) for driving the motor 304.

The gear portion 305 is located in the gear housing 302B, is provided on the rotational force transmission path from the motor 304 to the blade mounting portion 306, and is configured to decelerate the rotation of the rotating shaft 304A and transmit it to the blade mounting portion 306. ing. The gear portion 305 has a shaft 305A capable of transmitting the rotational force of the motor 304 via the pulley mechanism 310, and a rotation-regulated gear 305B.

The shaft 305A extends in the left-right direction and is rotatably supported about an axial center substantially parallel to the housing 302 in the left-right direction via a one-way clutch 308.

The rotation-restricted gear 305B is provided with a rotation-restricted hole 305a into which the spindle lock 307 can be inserted.

The blade mounting portion 306 has an output portion 306A that extends in the left-right direction and can fasten the bolt 306B.

The spindle lock 307 extends in the left-right direction, is located on the right side of the rotation-restricted gear 305B of the gear portion 305, and is configured to be insertable into the rotation-restricted hole 305a by an operator operating from the outside.

The one-way clutch 308 is located at the left end of the shaft 305A, and allows (transmits) forward rotation of the shaft 305A (clockwise rotation of the rotation shaft 41 of the motor 4 in the left view, the same applies hereinafter in the third embodiment). ) And reverse rotation (rotation of the rotation axis of the motor 4 in the counterclockwise direction in the left side view, the same applies to the third embodiment below).

From here, the operation of the tabletop circular saw 301 at the time of cutting the material to be cut (wood or the like) using the tabletop circular saw 301 according to the third embodiment will be described with reference to FIG.

When performing the cutting operation, the operator grips the handle 303 and places the material to be cut on the base portion 309. In this state, when a pulling operation is performed on a trigger (not shown) of the handle 303, electric power is supplied to the motor 304 from a power source (not shown), and the motor 304 starts driving. When the motor 304 starts driving, the rotary shaft 304A starts to rotate forward.

In this state, the shaft 305A of the gear portion 305 receives the rotational force from the motor 304 via the pulley mechanism 310 and rotates forward. Here, since the one-way clutch 308 allows the forward rotation of the shaft 305A, the shaft 305A can continue the normal rotation.

In this state, with the forward rotation of the gear portion 305, the output portion 306A rotates forward, so that the blade Q fixed to the blade mounting portion 306 rotates and cuts the material to be cut.

Further, the work of attaching / detaching (replacement) the blade Q of the desktop circular saw 301 by the operator will be described.

First, the work of removing the blade Q of the tabletop circular saw 301 by the operator will be described.

When performing the removal work, the operator uses a tool (spanner or the like) (not shown) to rotate the bolt 306B in the loosening direction (reverse direction). In this state, the shaft 305A starts reversing as the output unit 306A tries to reverse.

In this state, since the one-way clutch 308 regulates the reversal of the shaft 305A, the reversal of the output unit 306A is regulated. As a result, the operator can easily remove the blade Q without performing the operation of fixing the output unit 306A.

Next, the work of attaching the blade Q of the tabletop circular saw 301 by the operator will be described.

When performing the removal work, the operator pushes the spindle lock 307 to the left. As a result, the spindle lock 307 moves to the left.

In this state, the rotation of the rotation-restricted gear 305B is restricted as the spindle lock 307 is inserted into the rotation-restricted hole 305a of the rotation-restricted gear 305B. As a result, the transmission of the rotational force to the output unit 306A is restricted, and the operator can tighten the bolt 306B and attach the blade Q to the blade mounting portion 306 using a tool (spanner or the like) (not shown).

[Fourth Embodiment] The disc grinder 401 according to the fourth embodiment of the present invention will be described with reference to FIG. The same members and the like as in the first embodiment, the second embodiment, and the third embodiment are designated by the same drawing reference numbers, and the description thereof will be omitted. FIG. 11 is a cross-sectional view showing the internal structure of the disc grinder according to the fourth embodiment of the present invention.

First, the configuration of the disc grinder 401 will be described. In the following description of the disc grinder 401, "up" shown in FIG. 11 is defined as an upward direction, "down" is defined as a downward direction, "front" is defined as a forward direction, and "rear" is defined as a backward direction. In addition, the back of the page is defined as the right direction, and the front of the page is defined as the left.

The disc grinder 401 is an electric tool for grinding and polishing a metal steel material or the like (work material). As shown in FIG. 11, the disc grinder 401 has a housing 402, a motor 403, a bevel gear 404, a blade mounting portion 405 to which the blade R can be attached and detached, a spindle lock 406, and a one-way clutch 8. ..

The housing 402 includes a motor housing 402A that houses the motor 403, a gear housing 402B, and a cover 402C. The housing 402 is provided with a switch (not shown) for driving the motor 403.

The gear housing 402B extends forward from the front portion of the motor housing 402A and houses the bevel gear 404, the upper portion of the blade mounting portion 405, and the one-way clutch 8. The gear housing 402B is made of metal.

The cover 402C is made of metal and extends downward from the lower part of the gear housing 402B to accommodate the lower part of the blade mounting portion 405.

The motor 403 has a rotating shaft 403A and a rotor 403B.

The rotating shaft 403A extends in the left-right direction and is rotatably supported by the housing 402 via the bearing 403E and the one-way clutch 8 with the axis D as the rotating axis. A pinion 403C is provided on the right side of the rotating shaft 403A. The rotation shaft 403A and the pinion 403C rotate integrally. In the front-rear direction, a fan 403D that rotates coaxially with the rotating shaft 41 is fixed between the one-way clutch 8 and the rotor 403B. Here, the axis D shown in the drawing is a virtual center of rotation extending in the left-right direction through the center of the rotation axis 403A in the front view.

The bevel gear 404 is located within the gear housing 402B and meshes with the pinion 403C. The bevel gear 404 can rotate about an axis substantially parallel to the vertical direction.

The blade mounting portion 405 extends downward from the lower part of the gear housing 402B, and the blade R (grinding stone) is detachable. The blade mounting portion 405 has an output portion 405A, a first flange 405B, a second flange 405C, a bearing 405D, and a bearing 405E.

As shown in FIG. 11, the output unit 405A has a substantially cylindrical shape extending in the vertical direction. The output unit 405A is rotatably supported by the gear housing 402B and the cover 402C via the bearing 405D and the bearing 405E about the axis orthogonal to the axis D and parallel to the vertical direction. A bevel gear 404 is fixed to the output unit 405A by press fitting. The output unit 405A and the bevel gear 404 can rotate integrally about the axis orthogonal to the axis D and parallel to the vertical direction.

The spindle lock 406 is configured to regulate the rotation of the bevel gear 404.

From here, the operation of the disc grinder 401 at the time of cutting the work material (steel material or the like) using the disc grinder 401 according to the fourth embodiment will be described with reference to FIG.

When performing the cutting operation, the operator grips the housing 402 and presses the blade R against the work material. In this state, when an operation is performed on a slide switch (not shown) arranged on the side surface of the housing 402, electric power is supplied to the motor 4 from an external commercial power source via a power cord, and the motor 4 starts driving. .. When the motor 403 starts driving, the rotation shaft 403A, the rotor 403B, and the pinion 403C start normal rotation with the axis D as the rotation axis. In this state, the one-way clutch 8 allows the rotating shaft 403A to rotate normally, so that the rotating shaft 403A can continue to rotate normally. In the fourth embodiment, the clockwise rotation of the motor 403 in the rear view and the clockwise rotation of the output unit 405A in the top view are defined as normal rotation. Further, the rotation of the motor 403 in the counterclockwise direction in the rear view and the rotation of the output unit 405A in the counterclockwise direction in the top view are defined as reverse rotation.

In this state, the bevel gear 404 that meshes with the pinion 403C rotates integrally with the output unit 405A about an axis substantially parallel to the vertical direction. As the output unit 405A rotates, the blade R fixed to the blade mounting portion 405 rotates to grind and polish the material to be processed.

Further, the work of attaching / detaching (replacing) the blade R of the disc grinder 401 by the operator will be described.

First, the work of removing the blade R of the disc grinder 401 by an operator will be described.

When performing the removal operation, the operator presses the spindle lock 406 downward. As a result, the spindle lock 406 moves downward and engages with the bevel gear 404, thereby restricting the rotation of the bevel gear 404.

In this state, the operator rotates the second flange 405C in the direction of loosening the fastening (forward rotation direction). In this state, the output unit 405A tries to rotate in the normal direction, but since the rotation of the bevel gear 404 is restricted, the rotation of the output unit 405A is restricted. As a result, the operator can loosen the fastening of the second flange 405C and remove the blade R from the blade mounting portion 405 by using a special tool (not shown).

Next, the work of attaching the blade R of the disc grinder 401 by the operator will be described.

When performing the mounting work, the operator rotates the second flange 405C in the tightening direction (reverse direction). In this state, the rotating shaft 403A of the motor 403 starts reversing as the output unit 405A tries to reverse.

In this state, since the reversal of the rotating shaft 403A of the motor 403 is regulated by the one-way clutch 8, the reversing of the output unit 405A is regulated by restricting the reversing of the bevel gear 404 that rotates integrally with the output unit 405A. .. As a result, the operator can easily attach the blade R without performing the operation of fixing the output unit 405A.

As described above, in the electric round saw 1 according to the first embodiment of the present invention, the rotational force of the motor 4, the rotating shaft 41 extending in the left-right direction and being rotated by the motor 4, and the rotating shaft 41 is transmitted. It has an output unit 61 that rotates and the blade P can be attached and detached, and a one-way clutch 8 that is located at the right end of the rotation shaft 41 in the left-right direction and regulates the rotation of the rotation shaft 41 so that only normal rotation can be transmitted. ing. Therefore, only the forward rotation of the output unit 61 is allowed, and the reverse rotation is regulated. As a result, the blade P can be easily attached without fixing the output unit 61.

Further, the one-way clutch 8 in the electric circular saw 1 supports the rotating shaft 41 so that it can rotate in the normal direction. This makes it possible to have a simple structure without newly providing bearings.

Further, the electric circular saw 1 has a gear portion 5 between the motor 4 and the output unit 61 that decelerates the rotation of the motor 4 and transmits the rotation to the output unit 61. As a result, even when the output of the motor 4 is small, it is possible to generate a high torque in the output unit 61.

Further, the motor 4 in the electric circular saw 1 has a rotor 42 that rotates integrally with the rotating shaft 41. According to such a configuration, since the gear portion 5 is interposed between the rotating shaft 41 of the motor 4 supported by the one-way clutch 8 and the output portion 61, the output unit that generates the highest torque during work is generated. The one-way clutch 8 is located at a position away from 61 via the gear portion 5. As a result, the one-way clutch 8 can regulate the rotation of the rotating shaft 41 at a position where the load is small, and the durability of the electric circular saw 1 can be ensured.

In particular, in the electric round saw 1, the output unit 61 can rotate with high torque by a mechanism (two-stage deceleration mechanism) that decelerates twice using the first gear, the second gear, and the third gear of the gear unit 5. There are three rotation shafts (rotation shaft 41, intermediate shaft 54, and output unit 61) in the rotation transmission path from the motor 4 to the output unit 61. Among them, the one-way clutch 8 is used as a bearing for the rotation shaft 41. By using it, the load applied to the one-way clutch 8 and the gear housing 22 can be suppressed, and the durability of the electric round saw 1 can be ensured.

Further, since the handle 3 is located in the radial direction of the one-way clutch 8 (the one-way clutch 8 and the handle 3 are located on a virtual coplanar surface extending up, down, front and back), the gear is attached to the one-way clutch 8 when mounting the tip tool. The rotational moment transmitted to the housing 22 can be received on the same surface as the generation location. As a result, when the tip tool is mounted, a twisting force does not act on the electric circular saw 1, so that the blade P can be mounted stably.

Further, the gear portion 5 of the electric round saw 1 is located on the output unit 61 side with respect to the rotor 42 in the left-right direction, and is located on the output unit 61 side with respect to the rotor 42 in the left-right direction. Further, the gear housing 22 supports the gear portion 5 and the gear portion 5, and the gear housing 22 supports the right end portion of the rotating shaft 41 via the one-way clutch 8. As a result, the right end portion of the rotating shaft 41 and the gear portion 5 are supported by one gear housing 22, so that the total length of the electric circular saw 1 can be suppressed. Further, since the gear housing 22 is formed so as to support the right end portion of the rotating shaft 41 via the one-way clutch 8, it becomes possible to manufacture the gear housing 22 conforming to the standard of the one-way clutch 8, and the one-way clutch 8 can be manufactured. By using the gear housing 22 conforming to the above standard, the electric round saw 1 can be easily assembled.

Further, the gear housing 22 in the electric circular saw 1 is made of metal. As a result, the strength of the one-way clutch 8 arrangement portion of the gear housing can be increased as compared with the case where the resin gear housing is used, and the electric circular saw 1 is prevented from being damaged from the one-way clutch 8 arrangement portion. It becomes possible.

Further, since the one-way clutch 8 is used as the bearing of the rotating shaft 41 of the motor 4 in the electric circular saw 1, it is possible to regulate the rotation of the rotating shaft with a relatively simple configuration.

Further, since the motor 4 in the electric circular saw 1 is a DC brushless motor that is smaller than the conventional commutator motor, the size of the electric circular saw 1 can be reduced.

As described above, in the electric round saw 201 according to the second embodiment of the present invention, the rotational force of the motor 4, the rotating shaft 41 extending in the left-right direction and being rotated by the motor 4, and the rotating shaft 41 is transmitted. It has an output unit 61 that rotates and the blade P can be attached and detached, and a claw clutch 210 that is located at the right end of the rotation shaft 41 in the left-right direction and regulates the rotation of the rotation shaft 41 so that only normal rotation can be transmitted. ing. Therefore, only the forward rotation of the output unit 61 is allowed, and the reverse rotation is regulated. As a result, the blade P can be easily attached without fixing the output unit 61.

Further, the electric circular saw 201 has a gear portion 5 between the motor 4 and the output unit 61 that decelerates the rotation of the motor 4 and transmits the rotation to the output unit 61. As a result, even when the output of the motor 4 is small, it is possible to generate a high torque in the output unit 61.

Further, the motor 4 in the electric circular saw 201 has a rotor 42 that rotates integrally with the rotating shaft 41. According to such a configuration, since the gear portion 5 is interposed between the output unit 61 and the motor 4 in which the rotating shaft 41 is supported by the claw clutch 210, the output unit that generates the highest torque during work is generated. The claw clutch 210 is located at a position away from 61 via the gear portion 5. As a result, the rotation of the rotating shaft 41 can be regulated at a position where the load on the claw clutch 210 is small, and the durability of the electric circular saw 201 can be ensured.

Further, since the electric circular saw 201 employs a claw clutch 210, it is possible to regulate the rotation of the rotating shaft 41 with a relatively simple configuration.

Further, since the motor 4 in the electric circular saw 201 is a DC brushless motor that is smaller than the conventional commutator motor, the size of the electric circular saw 1 can be reduced.

As described above, in the desktop circular saw 301 according to the third embodiment of the present invention, the rotational force of the motor 304, the shaft 305A extending in the left-right direction and being rotated by the motor 304, and the shaft 305A is transmitted. It has an output unit 306A that rotates and the blade Q can be attached and detached, and a one-way clutch 308 that is located at the left end of the shaft 305A in the left-right direction and regulates the rotation of the shaft 305A so that only forward rotation can be transmitted. Therefore, only the forward rotation of the output unit 306A is allowed, and the reverse rotation is regulated. As a result, the blade Q can be easily removed without fixing the output unit 306A.

Further, the one-way clutch 308 in the tabletop circular saw 301 supports the shaft 305A so that it can rotate in the normal direction. This makes it possible to have a simple structure without newly providing bearings.

Further, the desktop circular saw 301 has a gear portion 305 between the motor 304 and the output unit 306A that decelerates the rotation of the motor 304 and transmits the rotation to the output unit 306A. As a result, even when the output of the motor 304 is small, it is possible to generate a high torque in the output unit 306A.

The gear housing 302B of the tabletop circular saw 301 is made of metal. As a result, the strength of the one-way clutch 308 arrangement portion of the gear housing can be increased as compared with the case where the resin gear housing is used, and the tabletop circular saw 301 is prevented from being damaged from the one-way clutch 308 arrangement location. It becomes possible.

Further, since the one-way clutch 308 is used as the bearing of the shaft 305A, it is possible to regulate the rotation of the rotating shaft with a relatively simple configuration.

Further, since the motor 304 in the desktop circular saw 301 is a DC brushless motor that is smaller than the conventional commutator motor, the size of the desktop circular saw 301 can be reduced.

As described above, in the disc grinder 401 according to the fourth embodiment of the present invention, the rotational force of the motor 403, the rotating shaft 403A extending in the front-rear direction and being rotated by the motor 403, and the rotating shaft 403A is transmitted. It has an output unit 405A to which the blade R can be attached and detached, and a one-way clutch 8 which is located at the front end of the rotation shaft 403A in the front-rear direction and regulates the rotation of the rotation shaft 403A so that only normal rotation can be transmitted. ing. Therefore, only the forward rotation of the output unit 405A is allowed, and the reverse rotation is regulated. As a result, the blade R can be easily attached without fixing the output unit 405A.

Further, the one-way clutch 8 in the disc grinder 401 supports the rotating shaft 403A so that it can rotate in the normal direction. This makes it possible to have a simple structure without newly providing bearings.

Further, since the disc grinder 401 employs the one-way clutch 8 as the bearing of the rotating shaft 403A of the motor 403, it is possible to regulate the rotation of the rotating shaft with a relatively simple configuration.

Although the embodiment of the present invention has been described, the power tool according to the present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the gist of the invention described in the claims. .. Further, in the above embodiment, the electric circular saw 1 having the one-way clutch 8 that supports the rotating shaft 41 so as to transmit only the normal rotation has been described as an example, but the present invention is not limited to this, and the configuration has the one-way clutch. If there is, the present invention can be applied, for example, it can be applied to a power tool such as a brush cutter that works with a rotating tip tool and needs to lock the output unit (spindle) when attaching / detaching the tip tool. Is.

Further, in the present embodiment, the regulating member is provided at only one place, but a plurality of regulating members may be provided. In this case, the load applied at the time of reversal can be distributed and received by a plurality of regulating members, so that the life can be extended.

1 ... Electric round saw, 2 ... Housing, 3 ... Handle, 4 ... Motor, 5 ... Gear part, 6 ... Blade mounting part, 7 ... Spindle lock, 8 ... One-way clutch, 9 ... Base, 21 ... Motor housing, 22 ... Gear housing, 41 ... Rotating shaft, 42 ... Rotor, 44 ... Rotation control part, 46 ... 1st bearing, 51 ... 1st gear, 52 ... 2nd gear, 53 ... 3rd gear, 55 ... 2nd bearing, 56 ... 3rd bearing, 61 ... Output section, 64 ... Bolt, 65 ... 4th bearing, 66 ... 5th bearing, 73 ... Regulatory section, 81 ... Cylinder section, 82 ... Roller, 83 ... Spring

Claims (8)

With a motor with a rotor ,
A rotating shaft that extends in a predetermined direction and is rotated integrally with the rotor by the motor.
An output unit that rotates by transmitting the rotational force of the rotating shaft and allows the tip tool to be attached and detached.
A deceleration mechanism that decelerates the rotation of the rotating shaft and transmits it to the output unit.
A metal case that supports the output unit and houses the deceleration mechanism,
A fixing mechanism that regulates the rotation of the output unit in both forward and reverse directions,
It has a regulating member located at one end of the rotating shaft in the predetermined direction.
The fixing mechanism can regulate the rotation of the rotating shaft by engaging with the rotating shaft at a position between the case and the rotor in the predetermined direction, and is a spindle lock that can be operated by an operator. Have,
The restricting member is supported by the case, allows rotation of the rotation shaft in one of the forward and reverse directions, and prohibits rotation in the other direction, so that the rotation shaft is in one direction. An electric tool characterized in that it functions as a bearing member that rotatably supports the rotating shaft when it rotates to . The reduction mechanism has an intermediate shaft that transmits the rotation of the rotation shaft to the output unit.
The power tool according to claim 1, wherein the case supports the intermediate shaft. 2. The deceleration mechanism is characterized in that the rotation of the rotating shaft is decelerated and transmitted to the intermediate shaft, and the rotation of the intermediate shaft is decelerated and transmitted to the output unit. Power tools described in. Before SL reduction mechanism, in the predetermined direction, located in the output section side with respect to the rotor,
Further having a gear housing for supporting the end of the rotating shaft located on the output side of the rotor in the predetermined direction and the speed reduction mechanism.
The power tool according to claim 1, wherein the gear housing supports the end portion via the regulating member. The power tool according to any one of claims 1 to 4 , wherein the regulating member is a one-way clutch. The regulating member regulates the rotation of the rotating shaft, which is transmitted by accelerating the rotation of the output unit when an external force is applied to the output unit in a direction in which the rotating shaft rotates to the other. The power tool according to claim 1, wherein the rotation of the output unit is regulated by this method. It has a housing for accommodating the motor and a base for supporting the housing.
The housing has a grippable handle and
The power tool according to any one of claims 1 to 6 , wherein the regulating member is provided inside the housing at a position between the handle and the base. The tip tool is fixed to the output unit by a bolt attached to the output unit.
By rotating the bolt relative to the output unit in the same direction as the rotation direction of the output unit that rotates the rotation shaft in the other direction, the bolt is screwed and attached to the output unit. The power tool according to any one of claims 1 to 7 , wherein the power tool can be used.

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