JP2021107101A - Work machine and filter - Google Patents

Abstract

To provide a filter which is suitably held without providing a housing with a new configuration and without accompanying deformation with respect to the housing, and a work machine to/from which the filter can be attached/detached.SOLUTION: A disc grinder 1 includes: a cooling fan 51A which can generate an air flow for cooling a motor 5 between a suction port section 22A and an exhaust port 2a in a housing 2; a left filter 31 and a right filter 32 which can be mounted in the housing 2, covers the suction port section 22A, and suppresses entering of powder dust into the housing 2 from the suction port section 22A, and a rear filter 33 which is separated from the left filter 31 and the right filter 32, can be mounted in the housing 2, and is engaged with the left filter 31 and the right filter 32. The filters are fixed to the housing 2 by engaging a claw section 312A with the housing 2 without accompanying elastic deformation and engaging an upper engagement section 31A with the rear filter 33 accompanying elastic deformation.SELECTED DRAWING: Figure 7

Description

The present invention relates to a working machine and a filter that can be attached to and detached from the working machine.

Conventionally, a motor, a housing in which an intake port and an exhaust port are formed, and a fan that rotates by receiving a driving force of the motor and generates cooling air for cooling the motor between the intake port and the exhaust port are provided. The electric working machine having is widely known. In such a configuration, a filter covering the intake port may be provided in order to prevent dust generated during work or the like from entering the housing through the intake port. For example, Cited Document 1 discloses, as an example of such a working machine, a grinder in which a filter member for suppressing the intrusion of dust from an intake port can be attached to and detached from a housing. In the grinding machine of Patent Document 1, a battery for supplying electric power to the motor is attached to and detached from the rear portion of the housing.

Further, the grinding machine housing of Patent Document 1 is provided with ribs for holding the filter member. In Reference 1, by mounting the battery in a state where the filter member is supported by the ribs, the filter member is held between the ribs and the side surface of the battery, and the movement of the filter member with respect to the housing is restricted (relative to the housing). Is fixed).

Japanese Unexamined Patent Publication No. 2016-007680

In the grinding machine of Patent Document 1, a method of fixing a filter member by using a battery is adopted, but such a method cannot be applied to a power tool (AC power tool) that uses an AC power supply. On the other hand, for example, it is conceivable that the filter member is provided with a claw that engages with the housing, and the filter member is fixed to the housing by latch-engaging the claw with the housing. However, it becomes necessary to provide the housing with a configuration for engaging with the claw, which complicates the configuration of the engagement portion with the claw in the housing. Further, in the latch engagement, since the engagement is performed while the claws are deformed according to the operation at the time of attachment / detachment, a part of the housing is caused by the frictional force caused by pushing the filter against the housing while deforming the claws. There is a risk of early deformation and wear.

Further, in the grinding machine of Patent Document 1, when the battery is removed, the movement restriction on the housing of the filter member by the side surface of the battery is released, so that the filter member may be unexpectedly removed from the housing when the battery is attached or detached. Further, since ribs for holding the filter member are provided on the outer periphery of the housing, the outer shape of the housing may become large. Further, since the battery is detachably attached to the rear part of the housing, it is not assumed that an intake port that opens rearward is provided at the rear part of the housing (for example, in the case of an AC tool), and Patent Document 1 The filter member cannot correspond to the intake port that opens rearward.

Therefore, an object of the present invention is to provide a filter that is suitably held without providing a new configuration in the housing of the working machine and without deformation of the housing, and a working machine to which the filter can be attached and detached. And.

In order to solve the above problems, the present invention provides a housing having an intake port and an exhaust port, a motor having a rotating shaft, and a motor provided on the rotating shaft to rotate by receiving a driving force of the motor. A fan capable of generating an air flow for cooling the motor between the intake port portion and the exhaust port portion in the housing, and at least a part of the intake port portion that can be attached to the housing. It has a filter portion that covers and suppresses the intrusion of dust into the housing from the intake port portion, and a fixing member that is separate from the filter portion and can be attached to the housing and engages with the filter portion. However, the filter portion has a first engaging portion that can be engaged with the housing without elastic deformation, and a second engaging portion that can be engaged with the fixing member with elastic deformation. Provided is a working machine characterized in that the first engaging portion engages with the housing and the second engaging portion engages with the fixing member to be fixed to the housing.

According to the working machine having the above configuration, the first engaging portion of the filter portion and the housing are inactively engaged without elastic deformation, and the second engaging portion of the filter portion and the fixing member are elastically deformed. The filter portion can be fixed to the housing by such positive engagement. That is, it is not necessary to fix the filter portion to the housing by elastically deforming a part of the housing, and deterioration of the housing can be suppressed.

In the above configuration, the fixing member is configured to be engageable with the housing without elastic deformation, and by engaging with the housing, the movement of the fixing member with respect to the housing is restricted in a predetermined direction. It is preferably configured.

According to such a configuration, the fixing member and the housing are engaged without elastic deformation, so that the movement of the fixing member with respect to the housing in a predetermined direction is restricted, so that the filter portion engages with the fixing member. This makes it possible to suitably fix the filter portion to the housing. Further, since the fixing member and the housing are engaged without elastic deformation, deterioration of the housing can be suppressed.

Further, the intake port portion has a first intake port formed on one side surface of the housing in the predetermined direction and a second intake port formed on the other side surface in the predetermined direction, and the filter portion. Is divisible into a first filter member that covers at least a part of the first intake port and a second filter member that covers at least a part of the second intake port, and the fixing member is the first By engaging with the filter member, the movement of the first filter member in the predetermined direction is restricted, and by engaging with the fixing member, the second filter member moves in the predetermined direction with respect to the fixing member. Is preferably configured to be regulated.

According to such a configuration, it is possible to preferably determine the relative positions of the fixing member, the first filter member, and the second filter member.

Further, by moving the fixing member in a direction intersecting the predetermined direction, the first engaging portion and the second engaging portion can be engaged with or disengaged from the housing and the fixing member. It is preferably configured to be possible.

According to such a configuration, the filter portion can be removed from the housing only by operating the fixing member in the direction intersecting the predetermined direction, so that workability is improved.

Further, the fixing member has an engaged portion that can be engaged with the second engaging portion, and one of the second engaged portion and the engaged portion has one of the engaged portions. It is preferable that a protruding portion projecting in the predetermined direction is provided for engaging with elastic deformation.

According to such a configuration, the second engaged portion and the engaged portion can be suitably engaged with each other. Further, it is possible to preferably regulate the relative movement of the fixing member and the filter portion in the direction intersecting the predetermined direction.

Further, the intake port portion further has a third intake port formed at an end portion of the housing in a direction orthogonal to the predetermined direction, and the fixing member corresponds to the third intake port and the third intake port. It is preferable that the filter member has a net unit that covers at least a part of the intake port.

According to such a configuration, even when the intake port is formed at the rear part of the housing, for example, the fixing member located at the rear part of the housing functions as a filter member, so that dust generated during work can be suitably prevented from entering. It becomes possible to suppress.

The present invention further comprises a housing having an intake port and an exhaust port, a motor having a rotation shaft, and the intake port provided in the rotation shaft and rotating by receiving a driving force of the motor to rotate the intake port in the housing. A fan capable of generating an air flow for cooling the motor between the portion and the exhaust port portion, and an intake port portion that can be attached to the housing and covers at least a part of the intake port portion. The filter unit has a filter unit that suppresses the intrusion of dust into the housing, and a fixing member that is separate from the filter unit and can be attached to the housing and can be engaged with the filter unit. Has a claw portion that can be engaged with the intake port portion of the housing, and the claw portion can be separated from the intake port portion in a state where the claw portion is engaged with the intake port portion. The attachment / detachment position and the fixed position where the claw portion is held by the intake port portion and the claw portion cannot be separated from the intake port portion can be moved with respect to the housing, and the fixing member Is engageable with both the filter portion and the housing when the filter portion is in the fixed position, and the fixing member is engaged with both the filter portion and the housing. Provided is a working machine characterized in that the movement of the filter unit from the fixed position to the detachable position is restricted in the state.

According to the working machine having the above configuration, since the claw portion of the filter portion is configured to be engageable with the intake port portion of the housing, it is not necessary to provide a new configuration for engaging the filter portion with the housing. Further, even when the fixing member is removed from the housing, the filter portion cannot be removed from the housing unless the filter portion is moved from the fixed position to the attachment / detachment position, so that the filter portion is prevented from being unexpectedly detached from the housing. Can be done.

In the above configuration, the movement between the suction attachment / detachment position and the fixed position is performed by the rotational movement of the filter portion with respect to the housing with the engagement portion between the claw portion and the intake port portion as a base point. Is preferable.

According to such a configuration, the filter unit can be moved between the attachment / detachment position and the fixed position with a simple configuration.

Further, when the filter portion moves from the attachment / detachment position to the fixed position, it is preferable that the claw portion and the intake port portion are engaged without elastic deformation.

According to such a configuration, since the claw portion and the intake port portion are engaged without elastic deformation, deterioration of the housing can be suppressed.

Further, it is preferable that the filter portion is configured so as to be able to be divided into two, and the movement to the attachment / detachment position is restricted by engaging each of the divided filter portions with the fixing member.

According to such a configuration, even when the filter unit is configured to be divisible, the filter unit can be suitably held at a fixed position.

The present invention further comprises a housing having an intake port and an exhaust port, a motor having a rotation shaft, and the intake port provided in the rotation shaft and rotating by receiving a driving force of the motor to rotate the intake port in the housing. A filter that can be attached to and detached from a working machine having a fan capable of generating an air flow for cooling the motor between the portion and the exhaust port portion, and can be attached to the housing. It has a filter portion that covers at least a part of the intake port portion and suppresses dust from entering the housing from the intake port portion, and a fixing member that can be attached to the housing and engages with the filter portion. However, the filter portion has a first engaging portion that can be engaged with the housing without elastic deformation, and a second engaging portion that can be engaged with the fixing member with elastic deformation. Provided is a filter characterized in that the first engaging portion engages with the housing and the second engaging portion engages with the fixing member to be fixed to the housing.

According to the filter having the above configuration, the first engaging portion of the filter portion and the housing are non-actively engaged without elastic deformation, and the second engaging portion of the filter portion and the fixing member are elastically deformed. The filter portion can be fixed to the housing by positively engaging with the housing. That is, it is not necessary to fix the filter portion to the housing by elastically deforming a part of the housing, and deterioration of the housing can be suppressed.

The present invention further comprises a housing having intake ports provided on the left and right side surfaces, a motor having a rotation shaft, and the intake port portions provided on the rotation shaft and rotating by receiving a driving force of the motor. A fan that introduces air for cooling the motor, and a filter unit that can be attached to the housing and covers at least a part of the intake port portion to prevent dust from entering the housing from the intake port portion. The filter portion has a right filter portion that covers a part of the intake port portion arranged on the right side surface of the housing, and a part of the intake port portion arranged on the left side surface of the housing. Provided is a working machine having a left filter unit that covers the housing, a connecting filter unit that connects the right filter unit and the left filter unit in the left-right direction, and each of which can be separated from each other.

According to the working machine having the above configuration, the housings having various shapes can be obtained by simply changing the shape of the connecting filter portion that connects the right filter portion and the left filter portion without changing the shapes of the right filter portion and the left filter portion. The filter unit can be attached and detached. Therefore, it is possible to reduce the cost by sharing the parts (right filter unit and left filter unit).

According to the filter and the working machine of the present invention, it is possible to suitably fix the filter to the housing without providing a new configuration in the housing of the working machine and without deforming the housing.

FIG. 5 is an external perspective view of a disc grinder according to a first embodiment of the present invention as viewed from substantially the lower left. It is an overall cross-sectional view which shows the internal structure of the disc grinder which concerns on 1st Embodiment of this invention. It is a perspective view which looked at the tail cover and the filter part of the disc grinder which concerns on 1st Embodiment of this invention from substantially the left rear, and shows the state which the filter part was removed from the tail cover. It is explanatory drawing which shows the attachment work of the filter part to the tail cover of the disc grinder which concerns on 1st Embodiment of this invention, and shows the state which the filter part was removed from the tail cover. It is explanatory drawing which shows the attachment work of the filter part to the tail cover of the disc grinder which concerns on 1st Embodiment of this invention, and the claw part of a right filter and a left filter is engaged with the intake port part of a tail cover. The state is shown. It is explanatory drawing which shows the attachment work of the filter part to the tail cover of the disc grinder which concerns on 1st Embodiment of this invention, and the engaging part of a filter part and the engaged part of a connecting part are engaged. The state is shown. It is a perspective view which saw the tail cover and the filter part which showed the state which the filter part of the disc grinder which concerns on 1st Embodiment of this invention is attached to a tail cover from substantially left rear. It is a perspective view which shows the arrangement in the housing of the intervening part of the lever part of the disc grinder which concerns on 1st Embodiment of this invention. It is a perspective view which shows the intervening part of the lever part of the disc grinder which concerns on 1st Embodiment of this invention. It is sectional drawing which shows the arrangement of the intervening part of the disc grinder which concerns on 1st Embodiment of this invention. It is a partial cross-sectional view which shows the operation of the lever part of the disc grinder which concerns on 1st Embodiment of this invention, and shows the state which the operator's operation with respect to a paddle lever is released. It is a partial cross-sectional view which shows the operation of the lever part of the disc grinder which concerns on 1st Embodiment of this invention, and shows the state which the paddle lever was pushed inward in the housing by an operator. It is a partial cross-sectional view which shows the operation of the lever part of the disc grinder which concerns on 1st Embodiment of this invention, and shows the state immediately after the pressure on the paddle lever inward by an operator is released. .. It is a circuit diagram which shows the electrical structure of the disc grinder which concerns on 1st Embodiment of this invention. It is a perspective view which saw the tail cover and the filter part which showed the state which the filter part of the disc grinder which concerns on 2nd Embodiment of this invention is attached to a tail cover from substantially left rear.

The disc grinder 1 which is an example of the working machine according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 14. The disc grinder 1 is an electric working machine for grinding, cutting, and the like of a work material by using a tip tool (grinding stone or the like) formed in a disk shape.

In the following description, "front" shown in the figure is defined as a forward direction, "rear" is defined as a backward direction, "up" is defined as an upward direction, and "down" is defined as a downward direction. Further, when the disc grinder 1 is viewed from behind, "right" is defined as the right direction, and "left" is defined as the left direction. When the dimensions, numerical values, etc. are referred to in the present specification, not only the dimensions and numerical values that completely match the dimensions and numerical values, but also the dimensions, numerical values, etc. that substantially match (for example, when it is within the range of manufacturing error). Shall include. Similarly for "identical", "orthogonal", "parallel", "match", "plane", etc., "substantially identical", "substantially orthogonal", "substantially parallel", "substantially match", "substantially flush", etc. Etc. shall be included.

As shown in FIGS. 1, 2 and 14, the disc grinder 1 includes a housing 2, a filter unit 3, a lever unit 4, a motor 5, a circuit board unit 6, a power transmission unit 7, and a tip. As an example of the tool, it has an output unit 8 to which the grindstone P can be attached and detached, a power supply circuit 9 (FIG. 14), a control unit 10 (FIG. 14), and an electronic switch 11 (FIG. 14) having a switch plunger 11A. ing.

As shown in FIG. 1, the housing 2 mainly includes a motor housing 21, a tail cover 22, and a gear housing 23. In the present embodiment, the housing 2 is composed of three parts arranged in the front-rear direction, but the housing 2 is not limited to this. For example, the motor housing 21 and the tail cover 22 may be integrally formed, or may have other divided shapes. Further, as shown in FIG. 2, the housing 2 has fixing screws 2B, 2C, 2D and 2E. Housing 2 is an example of a "housing" in the present invention.

The motor housing 21 shown in FIGS. 1 and 2 is made of resin or metal and houses the motor 5. The motor housing 21 is configured as a tubular housing that extends in the front-rear direction and is indivisible in the radial direction thereof. A bearing holder portion 211 is provided at the rear portion inside the motor housing 21.

A female screw hole 211a that penetrates the bearing holder portion 211 in the front-rear direction is formed in the upper portion of the bearing holder portion 211, and a female screw hole 211b that penetrates the bearing holder portion 211 in the front-rear direction is formed in the lower portion. Further, a through hole penetrating in the front-rear direction is formed in a substantially central portion of the bearing holder portion 211 in the radial direction, and a ball bearing 21A is provided on the inner surface thereof. A more detailed configuration of the motor housing 21 will be described later.

The tail cover 22 is made of resin or metal and houses the circuit board portion 6. The tail cover 22 is formed as a tubular housing that extends in the front-rear direction and is indivisible in the radial direction thereof. The tail cover 22 is formed with a through hole 22a that penetrates the wall in the front-rear direction. Further, as shown in FIG. 2, the tail cover 22 is provided with a protrusion 221, a support 22B, a power cord 2A, and a base 60. The protruding portion 221 is provided at the rear portion of the tail cover 22, and projects downward from the outer peripheral surface of the tail cover 22. The support portion 22B is provided at the lower part of the tail cover 22 and extends in the front-rear direction. As shown in FIG. 1, the support portion 22B has a wall portion that is symmetrically configured, and each of the wall portions is formed with a through hole 22b that penetrates the wall portion in the left-right direction.

The power cord 2A extends rearward from the rear end of the tail cover 22. The power cord 2A is configured to be connectable to an AC power source (for example, the commercial AC power source Q shown in FIG. 14). A cylindrical portion 222 is provided at the rear portion of the power cord 2A. The cylindrical portion 222 has a substantially cylindrical shape extending in the vertical direction. The cylindrical portion 222 is provided with a protruding portion 222A. The protruding portion 222A protrudes inward in the radial direction of the cylindrical portion 222 from the inner surface of the cylindrical portion 222.

The base portion 60 is provided to fix the circuit board portion 6 inside the tail cover 22 and to fix the motor housing 21 and the tail cover 22 to each other. A through hole 60a that penetrates the front portion of the base 60 in the front-rear direction is formed in the upper portion of the front portion of the base portion 60, and a through hole 60b that penetrates the front portion of the base portion 60 in the front-rear direction is formed in the lower portion. There is. Each of the through holes 60a and 60b is located at the same position in the vertical direction and the horizontal direction as each of the female screw holes 211a and 211b formed in the bearing holder portion 211 of the motor housing 21. In other words, each of the through holes 60a and 60b communicates with each of the female screw holes 211a and 211b in the front-rear direction. A female screw hole 60c extending in the front-rear direction is formed in the upper portion of the rear portion of the base portion 60. The female screw hole 60c is located at the same position in the vertical direction and the horizontal direction as the through hole 22a formed in the rear wall of the tail cover 22. In other words, the female screw hole 60c communicates with the through hole 22a in the front-rear direction. Further, the base portion 60 has an extension portion 60A. The extending portion 60A has a substantially cylindrical shape extending in the vertical direction at the rear end portion of the base portion 60. The shape of the outer peripheral surface of the extending portion 60A is formed to be the same as the shape of the inner surface of the cylindrical portion 222. A female screw hole 60d extending in the vertical direction is formed in the extending portion 60A.

In the present embodiment, the motor housing 21 and the tail cover 22 are connected via the base 60. Specifically, the fixing screw 2B is screwed into the female screw hole 211a of the bearing holder portion 211 of the motor housing 21 through the through hole 60a of the base portion 60, and the bearing holder portion is screwed through the through hole 60b of the base portion 60. The motor housing 21 and the base 60 are fixed to each other by screwing the fixing screw 2C into the female screw hole 211b of the 211. On the other hand, the base 60 and the tail cover 22 are fixed to each other by screwing the fixing screw 2D into the female screw hole 60c of the base 60 through the through hole 22a formed in the rear wall of the tail cover 22. In the present embodiment, the extending portion 60A of the base portion 60 is fitted into the cylindrical portion 222 of the power cord 2A, and the fixing screw 2E is screwed into the female screw hole 60d via the protruding portion 222A. As a result, the power cord 2A is configured to be suppressed from being detached from the housing 2.

Further, as shown in FIG. 1, a grip portion 20 which is a region gripped by an operator during work is provided so as to straddle the rear portion of the motor housing 21 and the front portion of the tail cover 22. A more detailed configuration of the tail cover 22 will be described later.

The gear housing 23 shown in FIGS. 1 and 2 is manufactured, for example, by integrally molding a metal such as aluminum, and accommodates the power transmission unit 7 and rotatably supports the output unit 8. Ball bearings 23A and 23B and needle bearings 23C are provided inside the gear housing 23. A wheel guard 24 is provided at the rear of the lower end of the gear housing 23. The wheel guard 24 is formed so as to cover the rear portion of the grindstone P attached to the output portion 8. Further, as shown in FIG. 1, an exhaust port portion 2a having an exhaust port formed so as to penetrate the front portion of the gear housing 23 in the front-rear direction is provided on the upper portion of the gear housing 23. In the present embodiment, the gear housing 23 and the motor housing 21 are fixed to each other by a predetermined mechanism or screwing. The exhaust port portion 2a is an example of the "exhaust port portion" in the present invention.

The motor 5 shown in FIG. 2 is an AC brushless motor and has a rotating shaft 51, a rotor 52, a stator 53, and three magnetic sensors 54 (FIG. 14). The motor 5 is an example of the "motor" in the present invention.

The rotation shaft 51 extends in the front-rear direction. The rotary shaft 51 extends in the left-right direction to the motor housing 21 and the gear housing 23 by being rotatably supported by the ball bearing 21A at its rear end and rotatably supported by the ball bearing 23A at its front end. It is rotatably supported around the axis. A cooling fan 51A is provided at the front portion of the rotating shaft 51. The rotating shaft 51 is an example of the "rotating shaft" in the present invention.

The cooling fan 51A is provided on the rotating shaft 51 so as to be rotatable integrally with the rotating shaft 51. The cooling fan 51A can generate an air flow for cooling the motor 5 between the intake port 22A and the exhaust port 2a in the housing 2 by rotating under the driving force of the motor 5. It is configured. The cooling fan 51A is an example of a "fan" in the present invention.

The rotor 52 is a rotor having a permanent magnet (see FIG. 14), and is fixed to the rotating shaft 51 so as to rotate coaxially with the rotating shaft 51. The stator 53 has a substantially cylindrical shape extending in the front-rear direction, and has star-shaped connected stator coils U, V, and W (FIG. 14). The three magnetic sensors 54 are Hall elements arranged on a substrate (not shown) provided behind the stator 53. The three magnetic sensors 54 are arranged side by side on the substrate at intervals of approximately 60 degrees in the circumferential direction of the rotating shaft 51. Each of the three magnetic sensors 54 is connected to the control unit 10 via a signal line.

The power transmission unit 7 shown in FIG. 2 is interposed between the motor 5 and the output unit 8 in the housing 2, decelerates the rotation of the rotation shaft of the motor 5 and transmits the power transmission unit 7 to the output unit 8. The power transmission unit 7 has a pinion gear 71 and a bevel gear 72 that mesh with each other.

The pinion gear 71 is formed in a substantially cylindrical shape extending in the front-rear direction, and is fixed to the front end portion of the rotating shaft 51 so as to rotate coaxially with the rotating shaft 51. The pinion gear 71 is formed so that its outer shape tapers toward the front. A plurality of gear teeth are provided on the outer peripheral surface of the pinion gear 71.

The bevel gear 72 is formed in a substantially annular shape in a plan view, and is configured so that the axis extending in a direction (vertical direction) orthogonal to the rotation axis of the rotation shaft 51 and the pinion gear 71 can be centered. The bevel gear 72 is provided with a plurality of gear teeth that mesh with the plurality of gear teeth of the pinion gear 71.

The output unit 8 shown in FIG. 2 has an output shaft 81, a washer 82 for detachably holding the grindstone P, and a nut 83.

The output shaft 81 has a substantially cylindrical shape extending in the vertical direction, and is rotatably supported by the gear housing 23 via a needle bearing 23C and a ball bearing 23B. The output shaft 81 has a male screw portion 81A. The male threaded portion 81A forms the lower part of the output shaft 81, and the male thread is cut on the outer peripheral surface thereof.

The washer 82 is provided below the output shaft 81. The washer 82 has a cylindrical portion 82A. The inner diameter of the cylindrical portion 82A is configured to be the same as the outer diameter of the male screw portion 81A, and the male screw portion 81A is inserted through the cylindrical portion 82A.

The nut 83 is provided at the lower end of the output shaft 81. The nut 83 is configured to be screwable to the male screw portion 81A. To fix the grindstone P to the output shaft 81, the cylindrical portion 82A of the washer 82 is inserted through a through hole formed in the center of the grindstone P in a plan view, and the upper surface of the grindstone P is brought into contact with the lower surface of the washer 82. , By screwing the nut 83 into the male screw portion 81A. Further, the grindstone P is removed from the output shaft 81 by releasing the screwing between the male screw portion 81A and the nut 83.

The grindstone P is, for example, a grindstone such as a resinoid flexible grindstone, a flexible grindstone, a resinoid grindstone, or a sanding disc having a substantially circular shape in a plan view and having a diameter of 100 mm. Surface polishing and curved surface polishing of concrete etc. are possible. The rear portion of the grindstone P is covered with a wheel guard 24 provided at the rear portion of the lower end portion of the gear housing 23 in a state where the grindstone P is fixed to the output shaft 81. In the present embodiment, the grindstone P is attached to the output unit 8, but the present invention is not limited to this. For example, other tip tools such as bevel wire brushes, non-woven brushes, and diamond wheels can also be attached to the output shaft 81.

As shown in FIG. 2, the circuit board portion 6 is housed in the tail cover 22 and has a circuit board 61 and a connector 62 (see FIG. 10). The circuit board 61 is fixed to the base 60. Various circuit elements such as switching elements Q1 to Q6 and a control unit 10 and the like that constitute the inverter circuit 96 are mounted on the circuit board 61. The connector 62 is provided for connecting various signal lines.

Next, the electrical configuration of the disc grinder 1 will be described with reference to FIG. The disc grinder 1 has a power supply circuit 9 and a control unit 10 as shown in FIG. The power supply circuit 9 and the control unit 10 are mounted on the circuit board 61.

The power supply circuit 9 is configured to be able to supply the power of the commercial AC power supply Q to the motor 5, and includes a noise filter circuit 91, a rectifier circuit 92, a plus line 93, a minus line 94, a smoothing circuit 95, and the like. It has an inverter circuit 96 and a constant voltage power supply circuit 97.

The noise filter circuit 91 is a circuit for reducing noise. As shown in FIG. 14, the noise filter circuit 91 has a first terminal 91A, a second terminal 91B, a choke coil 91C, and a capacitor 91D. The first terminal 91A and the second terminal 91B are terminals to which the voltage of the commercial AC power supply Q is applied while the power supply cord 2A is connected to the commercial AC power supply Q. The choke coil 91C and the capacitor 91D are filter elements for reducing noise propagating from the commercial AC power supply Q to the power supply circuit 9. The choke coil 91C is connected in series between the rectifier circuit 92 and the commercial AC power supply Q, and the capacitor 91D is connected in parallel with the commercial AC power supply Q.

As shown in FIG. 14, the rectifier circuit 92 is a diode bridge circuit having four diodes 92A (four rectifier elements), and rectifies the AC voltage output from the external power supply Q via the noise filter circuit 91. Is output to the smoothing circuit 95. In other words, the rectifier circuit 92 converts the AC voltage of the external power supply Q into a DC voltage and outputs it to the smoothing circuit 95.

As shown in FIG. 14, the plus line 93 and the minus line 94 connect the rectifier circuit 92 and the inverter circuit 96. Further, the minus line 94 is connected to a GND (not shown).

The smoothing circuit 95 is connected between the rectifier circuit 92 and the inverter circuit 96, smoothes the DC voltage output from the rectifier circuit 92, and outputs the DC voltage to the inverter circuit 96. The smoothing circuit 95 has a first capacitor 95A, a second capacitor 95B, and a resistor 95C.

The first capacitor 95A is a polar electrolytic capacitor and is connected between the plus line 93 and the minus line 94. In the present embodiment, the first capacitor 95A has a capacitance of about 180 μF, but is not limited to this, and a small capacitor having a capacitance of 40 to 200 μF can be adopted. The second capacitor 95B is a non-polar film capacitor and is connected between the plus line 93 and the minus line 94. In the present embodiment, the second capacitor 95B is a capacitor having a capacitance of about 4.7 μF. The resistor 95C is a resistor for discharging, and is connected between the plus line 93 and the minus line 94 and connected in parallel with the second capacitor 95B.

The inverter circuit 96 has six switching elements Q1 to Q6 connected in a three-phase bridge type. In the present embodiment, the switching elements Q1 to Q6 are MOSFETs (Metal Oxide Semiconductor Field Transistors), but are not limited to these, and may be switching elements such as IGBTs (Insulated Gate Bipolar Transistors).

Each gate of the switching elements Q1 to Q6 is connected to the control unit 10, and performs a switching operation based on the control signal input from the control unit 10. Further, each drain or each source of the switching elements Q1 to Q6 is connected to the stator coils U, V, and W. As shown in FIG. 10, the switching elements Q1 to Q6 are arranged in two rows on the left and right and three rows on the front and back at a substantially central portion of the tail cover 22 in the left-right direction.

The constant voltage power supply circuit 97 shown in FIG. 14 is connected between the plus line 93 and the minus line 94. The constant voltage power supply circuit 97 has a diode 97A, a capacitor 97B, an IPD circuit 97C, a capacitor 97D, and a regulator 97E, and converts the DC voltage output from the rectifier circuit 92 to generate a stabilized reference voltage. , Supply to the control unit 10 and the like.

The control unit 10 has a calculation unit, a ROM, a RAM, and the like (not shown), and is configured to control the inverter circuit 96 to drive the motor 5. The control unit 10 detects the rotational position of the rotor 52 based on the signals output from each of the three magnetic sensors 54, and switches the switching elements Q1 to Q6 on and off based on the detection result. Form a control signal. The control unit 10 outputs the control signal to the switching elements Q1 to Q6, sequentially switches the energized coils of the stator coils U, V, and W, and drives the rotor 52 to rotate in a predetermined rotation direction.

Next, the detailed configuration of the tail cover 22 and the filter unit 3 will be described with reference to FIGS. 3 and 4.

As shown in FIG. 3, the tail cover 22 has an intake port 22A for introducing cooling air for cooling a circuit element mounted on the circuit board 61, a control unit 10, and the like. The intake port portion 22A has intake port groups 22c, 22d, 22e, 22f, 22h and 22i composed of a plurality of intake ports. Each of the intake port groups 22c, 22d, 22e and 22f is formed symmetrically on the right side wall and the left side wall of the tail cover 22 at the rear portion of the tail cover 22. In other words, the intake port portion 22A has an intake port group formed on the left side surface of the tail cover 22 in the left-right direction and an intake port group formed on the right side surface. Therefore, in the following description, when the intake port groups 22c, 22d, 22e and 22f are referred to, the description will be made with reference to the intake port group formed on the left side surface of the tail cover 22. The intake port portion 22A is an example of the “intake port portion” in the present invention. The intake port group formed on the left side surface of the tail cover 22 is an example of the "first intake port" in the present invention. The intake port group formed on the right side surface of the tail cover 22 is an example of the "second intake port" in the present invention.

The intake port group 22c penetrates the left side wall of the tail cover 22 in the left-right direction at a substantially central portion in the front-rear direction of the tail cover 22. In the present embodiment, the intake port group 22c is formed by connecting six intake ports in the vertical direction.

The intake port groups 22d, 22e and 22f are formed in the order of the intake port groups 22d, 22e and 22f behind the intake port group 22c. The intake port groups 22d, 22e and 22f penetrate the left side wall of the tail cover 22 in the left-right direction. In the present embodiment, each of the intake port groups 22d, 22e, and 22f is formed with six intake ports connected in the vertical direction.

The intake port group 22g is located behind the intake port group 22f and penetrates the left side wall of the tail cover 22 in the left-right direction. In the present embodiment, the intake port group 22g is formed by connecting seven intake ports in the vertical direction. The seven intake ports forming the intake port group 22 g are formed so as to extend in the front-rear direction.

The intake port groups 22h and 22i are provided at the rear end portion of the tail cover 22 in the front-rear direction, and penetrate the rear wall of the tail cover 22 in the front-rear direction. The intake port group 22h is formed on the right side of the rear wall of the tail cover 22, and three intake ports extending in the vertical direction are formed side by side in the left-right direction. The intake port group 22i is formed at a substantially central portion of the rear wall of the tail cover 22, and four intake ports extending in the vertical direction are formed side by side in two vertical and horizontal rows. The intake port groups 22h and 22i are examples of the "third intake port" in the present invention.

The filter portion 3 shown in FIGS. 3 and 4 is detachably configured in the latter half of the tail cover 22 so as to cover the intake port portion 22A of the tail cover 22, and dust enters from the intake port portion 22A during work. Is configured to suppress. In the present embodiment, the filter unit 3 is configured to cover substantially the entire intake port portion 22A, but the filter unit 3 may be configured to cover a part of the intake port portion 22A. .. The filter unit 3 has a left filter 31, a right filter 32, and a rear filter 33. In other words, the filter unit 3 is configured to be separable into a left filter 31, a right filter 32, and a rear filter 33. The left filter 31, the right filter 32, and the rear filter 33 are made of resin. The left filter 31 is configured to cover the intake port group formed on the left side surface of the inner tail cover 22 of the intake port group of the intake port portion 22A. On the other hand, the right filter 32 is configured to cover the intake port group formed on the right side surface of the inner tail cover 22 of the intake port group of the intake port portion 22A. The left filter 31 and the right filter 32 are symmetrically configured. Therefore, in the drawings, the corresponding components of the left filter 31 and the right filter 32 are given the same reference number, and in the following description of each component of the left filter 31 and the right filter 32, the left filter 31 and the right are used. The description may be given with reference to one of the components of the filter 32, and the description may be omitted as appropriate.

As shown in FIG. 3, the left filter 31 and the right filter 32 have an upper wall portion 311 and a side wall portion 312, and a lower wall portion 313. The upper wall portion 311, the side wall portion 312, and the lower wall portion 313 are integrally formed. The upper wall portion 311 extends in the front-rear direction and is formed so as to cover the upper surface on the left side of the tail cover 22 in a state where the left filter 31 is attached to the tail cover 22. The upper wall portion 311 is provided with an upper engaging portion 31A. The left filter 31 and the right filter 32 are examples of the "filter unit" in the present invention. The left filter 31 is an example of the “left filter unit” in the present invention. The right filter 32 is an example of the “right filter unit” in the present invention.

The upper engaging portion 31A has a substantially plate shape protruding rearward from the right end portion of the upper wall portion 311. The upper engaging portion 31A is configured to be elastically deformable with respect to the upper wall portion 311. The upper engaging portion 31A has a hooking portion 31B. The hooking portion 31B is located at the rear end portion of the upper engaging portion 31A, and the upper engaging portion 31A projects upward in a claw shape so as to be able to engage with the rear filter 33 with elastic deformation. ..

The side wall portion 312 of the right filter 32 is formed so as to extend downward from the right end of the upper wall portion 311. The side wall portion 312 is formed so as to cover the side surface of the tail cover 22 when the right filter 32 is attached to the tail cover 22. The side wall portion 312 is formed with three openings 312a arranged in the front-rear direction. Although not shown in the figure, the opening 312a is provided with a fine metal mesh. The side wall portion 312 is provided with a claw portion 312A, a protruding portion 312B, and a protruding portion 312C. The side wall portion 312 of the left filter 31 is also configured in the same manner as described above.

The claw portion 312A has a substantially L-shape protruding from the inner surface of the side wall portion 312. In the present embodiment, four claw portions 312A are provided side by side in the vertical direction. Each of the four claw portions 312A is configured to correspond to four of the intake ports of the intake port group 22c of the intake port portion 22A of the tail cover 22. Each of the four claws 312A is configured to engage the wall forming the corresponding intake port of the intake port group 22c. Each of the four claw portions 312A has a first portion 312D and a second portion 312E.

The first portion 312D extends inward in the radial direction of the filter portion 3 from the inner surface of the side wall portion 312. The second portion 312E extends forward from the extending end of the first portion 312D.

The protruding portion 312B protrudes inward in the radial direction of the filter portion 3 from the inner surface of the side wall portion 312. In the present embodiment, the two protruding portions 312B are provided at the upper part of the side wall portion 312. Each of the two protruding portions 312B is configured to correspond to the upper two of the intake ports of the intake port group 22f of the intake port portion 22A of the tail cover 22. The side-view area of each of the two protrusions 312B is formed to be smaller than the side-view area of the corresponding intake port. Each of the two protrusions 312B is configured to enter the corresponding intake port when the filter portion 3 is attached to the tail cover 22.

The protruding portion 312C projects inward in the radial direction of the filter portion 3 from the inner surface of the side wall portion 312. In the present embodiment, one protrusion 312C is provided at the lower part of the side wall portion 312. The protrusion 312C is configured to correspond to one of the lower portions of the intake port group 22f of the intake port portion 22A. The side view area of the protrusion 312C is smaller than the corresponding intake port area. The protrusion 312C is configured to enter the corresponding intake port when the filter portion 3 is attached to the tail cover 22.

The lower wall portion 313 is formed so as to extend downward from the lower end of the rear end portion of the side wall portion 312. The lower wall portion 313 is provided with a lower engaged portion 313A. The lower engaged portion 313A is formed so as to be recessed inward in the radial direction of the filter portion 3 from the outer surface of the lower wall portion 313. The lower engaged portion 313A has an engaged projection 313B. The engaged protrusion 313B protrudes outward in the radial direction of the filter portion 3 in the internal space of the lower engaged portion 313A.

The rear filter 33 is configured to be mountable to the housing 2 and engageable with the left filter 31 and the right filter 32. The rear filter 33 is formed in a substantially disk shape in rear view. The rear filter 33 has a pair of lower engaging portions 33A, an upper engaged portion 33C, a protruding portion 33D, and a protruding portion 33E. In the present embodiment, the rear filter 33 is configured to function as a filter, but the rear filter 33 may be provided only for connecting the left filter 31 and the right filter 32 in the left-right direction. good. The rear filter 33 is an example of the "fixing member" in the present invention. The rear filter 33 is an example of the "connecting filter unit" in the present invention.

The lower engaging portion 33A is provided symmetrically in the lower part of the rear filter 33. Each of the two lower engaging portions 33A is configured to be engageable with the lower engaged portion 313A of the left filter 31 and the right filter 32. Each of the two lower engaging portions 33A is formed in a substantially plate shape protruding from the front surface of the rear filter 33 toward the front. The lower engaging portion 33A is configured to be elastically deformable with respect to the main body portion of the rear filter 33. The lower engaging portion 33A has a hooking portion 33B. The hooking portion 33B is located at the front end portion of the lower engaging portion 33A so that the lower engaging portion 33A can engage with the lower engaged portion 313A of the left filter 31 and the right filter 32 with elastic deformation. The filter portion 3 protrudes inward in the radial direction and substantially downward in a claw shape.

The upper engaged portion 33C is provided on the upper portion of the rear filter 33. The upper engaged portion 33C is configured to be engageable with the upper engaging portion 31A of the left filter 31 and the right filter 32. Although not shown in the figure, the upper engaged portion 33C is provided with a recess that is recessed upward so as to accept the hooked portion 31B of the upper engaged portion 31A.

The protruding portion 33D protrudes forward from the front surface of the rear filter 33. In the present embodiment, three protrusions 33D are provided on the right side of the rear filter 33. Each of the three protrusions 33D is configured to correspond to each of the three intake ports of the intake port group 22h of the intake port portion 22A of the tail cover 22. The front-view area of each of the three protrusions 33D is formed to be smaller than the front-view area of the corresponding intake port. Each of the three protrusions 33D is configured to enter the corresponding intake port when the filter portion 3 is attached to the tail cover 22.

The protruding portion 33E protrudes forward from the front surface of the rear filter 33. In the present embodiment, two protrusions 33E are provided at the lower part of the rear filter 33. Each of the two protrusions 33E is configured to correspond to two intake ports in the intake port group 22i of the intake port portion 22A. The front-view area of each of the two protrusions 33E is formed to be smaller than the front-view area of the corresponding intake port of the intake port group 22i. Each of the two protrusions 33E is configured to enter the corresponding intake port when the filter portion 3 is attached to the tail cover 22.

Further, the rear filter 33 is formed with an opening 33a, an opening 33b and a notch 33c. The opening 33a is formed so as to pass through the rear filter 33 in the front-rear direction from the right portion to the center portion of the rear filter 33. Although not shown in the figure, the opening 33a is provided with a fine metal mesh. The opening 33b is formed so as to penetrate the rear filter 33 in a rectangular shape in the front-rear direction at the left portion of the rear filter 33. The disc grinder 1 in the present embodiment is not provided with a dial for adjusting the rotation speed of the motor 5, but an electric dial for adjusting the rotation speed of the motor is provided at the rear of the tail cover. When the filter unit 3 is attached to the work machine of the type, the adjustment dial can be exposed through the opening 33b. The notch 33c is formed in the lower part of the rear filter 33, and is notched upward in a circular shape. With the rear filter 33 attached to the tail cover 22, the power cord 2A can be exposed through the notch 33c. The metal mesh is an example of the "net unit" in the present invention.

Next, the work of attaching / detaching the filter unit 3 to / from the tail cover 22 will be described with reference to FIGS. 4 to 7.

First, as shown in FIGS. 4 and 5, the operator engages the claw portion 312A of the left filter 31 and the right filter 32 with the intake port portion 22A of the tail cover 22. Specifically, the second portion 312E of the claw portion 312A is made to enter the inside of the tail cover 22 via the intake port group 22c. After that, as shown in FIG. 6, the left filter 31 and the right filter 32 are rotated with respect to the tail cover 22 about the claw portion 312A so that the rear portion is close to the tail cover 22 so that the left filter 31 and the right filter 32 are close to the tail cover 22. And the right filter 32 is attached to the tail cover 22. In this state, the side surface of the second portion 312E that has entered the housing 2 faces the inner surface of the housing 2. Further, the front surface of the first portion 312D of the claw portion 312A and the front wall forming the intake port group 22c face each other, and the rear surface of the first portion 312D and the rear wall forming the intake port group 22c face each other to the left. The movement of the filter 31 and the right filter 32 in the front-rear direction with respect to the housing 2 is restricted. That is, the operator can hold the claw portion 312A inseparably from the tail cover 22 by rotating the left filter 31 and the right filter 32 at the positions shown in FIG. 6 about the claw portion 312A. be. Hereinafter, the position shown in FIG. 6 is referred to as a fixed position.

Further, the protruding portion 312B and the protruding portion 312C provided on the side wall portion 312 of the left filter 31 and the right filter 32 enter the intake port group 22g of the intake port portion 22A. In this state, the front surface of the protruding portion 312B and the protruding portion 312C and the front wall forming the intake port group 22g face each other, and the rear surface of the protruding portion 312B and the protruding portion 312C and the rear wall forming the intake port group 22g face each other. By doing so, the movement of the left filter 31 and the right filter 32 in the front-rear direction with respect to the housing 2 is restricted. That is, the left filter 31 and the right filter 32 can be engaged (inactively engaged) with the tail cover 22 without elastic deformation. In the present specification, in the engagement between members, an engagement that requires elastic deformation of at least one of the members when shifting to the engaged state or releasing the engaged state is positively engaged. On the contrary, an engagement that does not require elastic deformation of the member is called a non-aggressive engagement. The claw portion 312A is an example of the "first engaging portion" in the present invention.

In this state, the intake port groups 22c, 22d, 22e, 22f, and 22g of the intake port portion 22A formed on the side surface of the tail cover 22 are formed by a metal mesh provided in the opening 31a of the left filter 31 and the right filter 32. Covered from the side. As a result, it is possible to prevent dust from entering the housing 2 via the intake port groups 22c, 22d, 22e, 22f, and 22g during work.

Next, as shown in FIGS. 5 and 6, the operator causes the upper engaged portion 31A of the left filter 31 and the right filter 32 to engage with the upper engaged portion 33C of the rear filter 33. The rear filter 33 is moved forward with respect to the left filter 31 and the right filter 32. In other words, the rear filter 33 is moved in a direction that intersects the left filter 31 and the right filter in the left-right direction. When the hooked portion 31B of the upper engaging portion 31A abuts and is pressed against the upper engaged portion 33C, the upper engaging portion 31A is elastically deformed downward with respect to the left filter 31 and the right filter 32. After that, the hooking portion 31B enters the recess formed in the upper engaged portion 33C and is recessed upward, so that the pressure on the upper engaging portion 31A is released, and the upper engaging portion 31A is applied to the upper engaged portion 33C. It elastically deforms upward so as to return to the state before being pressed.

Then, as shown in FIGS. 6 and 7, the operator rearly so that the lower engaged portion 313A of the left filter 31 and the right filter 32 and the lower engaged portion 33A of the rear filter 33 engage with each other. The filter 33 is rotated in the clockwise direction in the figure with respect to the left filter 31 and the right filter 32. In other words, the rear filter 33 is rotated in a direction intersecting the left filter 31 and the right filter 32 in the left-right direction. The hooked portion 33B of the lower engaging portion 33A abuts on the engaged projection 313B provided on the lower engaged portion 313A and is pressed outward in the radial direction of the filter portion 3 to cause the lower engaging portion 33A. Elastically deforms outward in the radial direction with respect to the left filter 31 and the right filter 32. After that, as shown in FIG. 7, the hooking portion 33B engages with the engaged projection 313B to release the pressure on the lower engaging portion 33A, and the lower engaging portion 33A is pressed against the engaged projection 313B. It elastically deforms inward in the radial direction so as to return to the previous state. That is, the left filter 31 and the right filter 32 are attached to the rear filter 33 by the engagement between the upper engaging portion 31A and the upper engaged portion 33C and the engagement between the lower engaging portion 33A and the lower engaged portion 313A. On the other hand, it is possible to engage (actively engage) with elastic deformation. The engagement between the upper engaging portion 31A and the upper engaged portion 33C and the engagement between the lower engaging portion 33A and the lower engaged portion 313A require elastic deformation to disengage, so that an engaging force is applied. It is strong and preferably suppresses the rear filter 33 from falling off. The upper engaging portion 31A and the lower engaged portion 313A are examples of the "second engaging portion" in the present invention. The upper engaged portion 33C and the lower engaged portion 33A are examples of the “engaged portion” in the present invention.

In this state, the intake port groups 22h and 22i of the intake port portion 22A formed on the rear surface of the tail cover 22 are laterally covered with a metal mesh provided in the opening 33a of the rear filter. As a result, it is possible to prevent dust from entering the housing 2 through the intake port groups 22h and 22i during work.

In the above description, the lower engaging portion 33A and the lower engaged portion 313A are engaged after the upper engaging portion 31A and the upper engaged portion 33C are engaged. The order of engagement is not limited to this. Specifically, the lower engaging portion 33A and the lower engaged portion 313A may be engaged before the engagement between the upper engaging portion 31A and the upper engaged portion 33C, or each of them may be engaged. Engagement may be done at the same time.

At this time, the rear filter 33 is moved in the left-right direction with respect to the left filter 31 due to the engagement between the upper engaging portion 31A and the upper engaged portion 33C and the engagement between the lower engaging portion 33A and the lower engaged portion 313A. Movement is restricted. Then, the right filter 32 moves in the left-right direction with respect to the rear filter 33 due to the engagement between the upper engaging portion 31A and the upper engaged portion 33C and the engagement between the lower engaging portion 33A and the lower engaged portion 313A. Is regulated. That is, it is possible to preferably determine the relative positions of the rear filter 33, the left filter 31, and the right filter 32.

Further, since the hooked portion 31B of the upper engaging portion 31A protrudes upward and the hooked portion 31B of the lower engaging portion 33A protrudes substantially inward of the filter portion 3, the rear filter 33 and the rear filter 33 in the front-rear direction It is possible to preferably regulate the relative movement of the left filter 31 and the right filter 32.

Further, the protruding portion 33D provided on the front surface of the rear filter 33 enters the intake port group 22h of the intake port portion 22A, and the protruding portion 33E enters the intake port group 22i. That is, the rear filter 33 engages (inactively engages) with the tail cover 22 without elastic deformation. In this state, the right surface of the protruding portion 33D and the right wall forming the intake port group 22h face each other, and the left surface of the protruding portion 33D and the left wall forming the intake port group 22h face each other. Similarly, the right surface of the protruding portion 33E and the right wall forming the intake port group 22i face each other, and the left surface of the protruding portion 33E and the left wall forming the intake port group 22i face each other. As a result, the movement of the rear filter 33 with respect to the tail cover 22 in the left-right direction is restricted.

As described above, the claw portion 312A of the left filter 31 and the right filter 32 and the tail cover 22 are inactively engaged without elastic deformation, and the upper engaging portion 31A of the left filter 31 and the right filter 32 and the rear The filter 33 can be positively engaged with elastic deformation. That is, by elastically deforming a part of the housing 2, it is not necessary to fix the left filter 31 and the right filter 32 to the housing 2, and deterioration of the housing 2 can be suppressed. Further, the housing 2 does not require a special structure for positive engagement, and the engaging portion on the housing 2 side is a filter portion using a simple hole such as a wind window as in the present embodiment. 3 can be attached. Therefore, according to the filter of the present invention, the filter can be attached / detached to a conventional working machine having only a wind window or a working machine having a simple structure and suppressing the manufacturing cost. Further, since the filter portion 3 is finally fixed to the housing 2 by positive engagement, the fixing force of the filter portion 3 can be suitably secured.

Further, since the rear filter 33 and the housing 2 are engaged with each other without elastic deformation, the movement of the rear filter 33 with respect to the housing 2 in the left-right direction is restricted, so that the left filter 31 and the right filter 32 are combined with the rear filter 33. By engaging (actively engaging), the left filter 31 and the right filter 32 can be suitably fixed to the housing 2. Further, since the rear filter 33 and the housing 2 are engaged without elastic deformation, deterioration of the housing 2 can be suppressed.

When removing the filter portion 3 from the tail cover 22, the operator first disengages the rear filter 33 from the left filter 31 and the right filter 32. Specifically, as shown in FIGS. 6 and 7, the rear engaging portion 313A of the left filter 31 and the right filter 32 and the lower engaging portion 33A of the rear filter 33 are disengaged from each other. The filter 33 is rotated in the counterclockwise direction shown in the figure with respect to the left filter 31 and the right filter 32. In other words, the rear filter 33 is moved in a direction that intersects the left filter 31 and the right filter 32 in the left-right direction. In this state, the hooked portion 33B of the lower engaging portion 33A abuts and is pressed against the engaged projection 313B provided on the lower engaged portion 313A, so that the filter portion 3 is elastically deformed outward in the radial direction. do. After that, as shown in FIG. 6, when the lower engaging portion 33A and the lower engaged portion 313A are separated from each other, the lower engaging portion 33A is elastic so as to return to the state before being pressed by the engaged projection 313B. change.

Next, as shown in FIGS. 5 and 6, the operator disengages the upper engaging portion 31A of the left filter 31 and the right filter 32 from the upper engaged portion 33C of the rear filter 33. , The rear filter 33 is moved backward with respect to the left filter 31 and the right filter 32. In other words, the rear filter 33 is moved in a direction that intersects the left filter 31 and the right filter 32 in the left-right direction. At this time, the hooked portion 31B of the upper engaging portion 31A abuts and is pressed against the upper engaged portion 33C, so that the upper engaging portion 31A is elastic downward with respect to the left filter 31 and the right filter 32. change. After that, as shown in FIG. 5, when the upper engaging portion 31A and the upper engaged portion 33C are separated from each other, the upper engaging portion 31A returns to the state before being pressed by the upper engaged portion 33C. Elastically deforms.

Then, the operator rotates the left filter 31 and the right filter 32 with respect to the tail cover 22 about the claw portion 312A so that the rear portion is separated from the tail cover 22, and then moves the left filter 31 and the right filter 32. Remove from the tail cover 22. That is, the operator can separate the claw portion 312A from the tail cover 22 by rotating the left filter 31 and the right filter 32 at the positions shown in FIG. 5 about the claw portion 312A. Hereinafter, the position shown in FIG. 5 is referred to as a detachable position.

As described above, according to the disc grinder 1 according to the present embodiment, the left filter 31 and the right filter 32 can be easily removed from the tail cover 22 only by moving the rear filter 33 in the direction intersecting the left-right direction. Workability is improved because it is configured in.

Further, the rear filter 33 can be engaged with the left filter 31, the right filter 32 and the tail cover 22 when the left filter 31 and the right filter 32 are located at fixed positions, and the rear filter 33 is the left filter 31 and the right filter. In the state of being engaged with the filter 32 and the tail cover 22, the movement of the left filter 31 and the right filter 32 from the fixed position to the attachment / detachment position is restricted. Therefore, it is not necessary to provide the housing 2 with a new configuration for engaging the left filter 31 and the right filter 32 with the tail cover 22.

Further, even when the rear filter 33 is removed from the tail cover 22, the left filter 31 and the right filter 32 cannot be removed from the tail cover 22 unless the left filter 31 and the right filter 32 are moved from the fixed position to the attachment / detachment position. It is possible to prevent the left filter 31 and the right filter 32 from being separated from the tail cover 22.

Further, the movement between the attachment / detachment position and the fixed position is performed by the rotational movement of the left filter 31 and the right filter 32 with respect to the tail cover 22 with the engagement portion between the claw portion 312A and the intake port portion 22A as the base point. With a simple configuration, the left filter 31 and the right filter 32 can be moved between the attachment / detachment position and the fixed position.

Further, when the left filter 31 and the right filter 32 move from the attachment / detachment position to the fixed position, the claw portion 312A and the intake port portion 22A engage with each other without elastic deformation, so that deterioration of the housing 2 is suppressed. Is possible.

Further, the left filter 31 and the right filter 32 are configured as symmetrical two-divided filters, and the divided left filter 31 and the right filter each engage with the rear filter 33 to move to the attachment / detachment position. Can be suitably regulated.

Next, the detailed configuration of the motor housing 21, the lever portion 4, and the electronic switch 11 and the arrangement of the lever portion 4 in the housing 2 will be described with reference to FIGS. 1, 2, and 8 to 12.

As shown in FIGS. 1, 2 and 8, the lever portion 4 is provided at the lower part of the tail cover 22 and has a paddle lever 41 and an intervening portion 42. The paddle lever 41 is provided on the grip portion 20 straddling the motor housing 21 and the tail cover 22, and extends in the front-rear direction. The paddle lever 41 is provided with a pressing portion 41A, a spring 411, an off-lock mechanism 412, and a rotating shaft 413.

As shown in FIG. 8, the pressing portion 41A has a substantially columnar shape protruding inward of the housing 2 from the rear portion of the paddle lever 41. The pressing portion 41A has a lever engaging portion 41B. The lever engaging portion 41B protrudes from the extending end portion of the pressing portion 41A in a direction orthogonal to the extending direction of the pressing portion 41A.

As shown in FIG. 1, the rotation shaft 413 is provided at the rear portion of the paddle lever 41 and has a substantially cylindrical shape extending in the left-right direction. The rotation shaft 413 is inserted into a through hole 22b formed in the support portion 22B of the tail cover 22. As a result, the paddle lever 41 is configured to be rotatable in the clockwise direction of FIG. 11 with respect to the tail cover 22 about the rotation shaft 413 by being pushed inward of the housing 2 by an operator. In other words, the paddle lever 41 can move up and down to drive and stop the motor 5.

As shown in FIG. 2, the spring 411 is provided between the paddle lever 41 and the outer peripheral surface of the tail cover 22. The spring 411 urges the paddle lever 41 so that the paddle lever 41 is separated from the tail cover 22. More specifically, the spring 411 urges the paddle lever 41 so as to rotate in the counterclockwise direction of FIG. 2 about the rotation shaft 413.

As shown in FIG. 2, the off-lock mechanism 412 has an off-lock member 412A and a spring 412B. The off-lock member 412A has a substantially plate shape extending in a direction orthogonal to the extending direction of the paddle lever 41 in a state where no external force is applied to the disc grinder 1. One end of the off-lock member 412A projects downward from the lower surface of the paddle lever 41. The spring 412B is provided on the paddle lever 41 so as to rotate the off-lock member 412A in the counterclockwise direction of FIG. Therefore, unless the operator rotates the off-lock member 412A clockwise against the urging force of the spring 412B, the other end of the off-lock member 412A when the paddle lever 41 is pushed inward of the housing 2. Is in contact with the outer periphery of the tail cover 22, and the paddle lever 41 cannot be pushed inward of the housing 2 any more. As a result, it is suppressed that the disc grinder 1 is suddenly driven. Further, in the present embodiment, since the protrusion 221 is provided at the rear portion of the tail cover 22, even when the disc grinder 1 falls to the ground, the protrusion 221 is on the ground before the paddle lever 41. The disc grinder 1 is more preferably suppressed from being driven unexpectedly by contacting with.

As shown in FIG. 9, the intervening portion 42 has a mounted portion 421, a lever 422, and a pin 423. The attached portion 421 has a base portion 421A, a first protrusion 421B, a second protrusion 421C, and a lever holding portion 421E. The attached portion 421 is attached to the motor housing 21 as described later.

The base portion 421A has a substantially plate shape extending in the vertical direction. Although not shown in the figure, a through hole is formed in the lower part of the base portion 421A so as to penetrate the base portion 421A in the left-right direction. The first protrusion 421B is provided so as to project from the upper portion of the base portion 421A to the left in a substantially trapezoidal shape. The second protrusion 421C is provided on the front portion of the base portion 421A. The second protrusion 421C has a substantially trapezoidal shape extending in the front-rear direction and the left-right direction. Further, the right surface of the second protrusion 421C has a curved surface 421D that is curved with a predetermined curvature.

The lever holding portion 421E is located below the mounted portion 421 and has a substantially plate shape extending in the vertical direction and the front-rear direction. A through hole is formed in a substantially central portion of the lever holding portion 421E in the front-rear direction so as to penetrate the lever holding portion 421E in the left-right direction. The through hole is located at the same position in the front-rear direction and the up-down direction as the through hole (not shown) formed in the lower part of the base portion 421A.

The lever 422 has a lever base portion 422A, a pressed portion 422B, a notch portion 422C, an engaged portion 422D, and a reinforcing portion 422E. The lever base 422A has a substantially plate shape extending in the front-rear direction. Although not shown in the figure, a through hole is formed in the front portion of the lever base portion 422A so as to penetrate the lever base portion 422A in the left-right direction. The through hole (not shown) is located at the same position in the vertical direction and the front-rear direction as the through hole (not shown) formed in the lower part of the base portion 421A of the attached portion 421 and the through hole formed in the lever holding portion 421E. In the present embodiment, the pin 423 is fitted into the through hole of the lever base 422A, the through hole of the base 421A, and the through hole of the lever holding portion 421E, so that the lever 422 is mounted around the pin 423. It is possible to rotate with respect to.

The pressed portion 422B is located behind the lever base portion 422A and extends in the front-rear direction, and is formed to be wider in the left-right direction than the lever base portion 422A. The pressed portion 422B is configured to be in contact with the pressing portion 41A of the paddle lever 41. The lever 422 is movable between the release position shown in FIG. 11 and the pressing position shown in FIG. 12 due to being pressed by the paddle lever 41. The notch portion 422C has a shape notched so as to form a rear end portion of the lever 422 and to be recessed to the left.

The engaged portion 422D is provided so as to project downward in an L shape at a substantially central portion of the lever 422 in the front-rear direction. The engaged portion 422D is configured to be engageable with the lever engaging portion 41B of the paddle lever 41.

The reinforcing portion 422E is provided so as to connect the lower surface of the lever base portion 422A and the front surface of the engaged portion 422D. By providing the reinforcing portion 422E, the strength against the force in the direction of tilting the engaged portion 422D forward is reinforced.

As shown in FIG. 11, the electronic switch 11 is housed in a tail cover 22 and has a switch plunger 11A and a leaf spring 11B.

As shown in FIG. 11, the switch plunger 11A is provided at the position B of the grip portion 20 straddling the motor housing 21 and the tail cover 22 in the axis A direction, and is configured to detect the position of the intervening portion 42 with respect to the housing 2. Has been done. The axis A is an axis extending in the front-rear direction through substantially the center of the grip portion. The switch plunger 11A is configured to be expandable and contractible by being pressed upward with respect to the switch body. Specifically, the switch plunger 11A can be switched between an on position for driving the motor 5 (FIG. 11) and an off position for stopping the motor 5 (FIG. 12) by moving in the vertical direction. In the present embodiment, the moving distance between the on position and the off position of the switch plunger 11A is compared with the moving distance of the paddle lever in the vertical direction when the operator pushes the paddle lever 41 inward of the housing 2. Very small. That is, when the switch plunger 11A is turned on, the amount of upward operation of the switch plunger 11A with respect to the switch plunger 11A is smaller than the amount of operation of the operator with respect to the paddle lever 41.

Further, in the present embodiment, the electronic switch 11 controls the motor 5 to be driven when the switch plunger 11A detects that the intervening portion 42 is located at the pressing position, and the intervening portion 42 is in the releasing position. When the switch plunger 11A detects that the position is located at, the motor 5 is controlled so that the motor 5 is stopped. The switch plunger 11A is an example of a detection unit, and may be configured to detect the position of the intervening unit 42 with a magnetic sensor, a distance sensor, or the like.

The leaf spring 11B is provided between the lower surface of the switch body and the lever base 422A. The leaf spring 11B urges the lever 422 so that the switch plunger 11A and the lever 422 are separated from each other. Specifically, the leaf spring 11B urges the lever 422 so that the lever 422 rotates about the pin 423 in the clockwise direction of FIG.

Here, as shown in FIG. 10, the intervening portion 42 and the electronic switch 11 are arranged at positions close to the left side surface inside the housing 2. Therefore, it is suppressed that the cooling air introduced from the intake port portion 22A of the tail cover 22 is blocked by the intervening portion 42 and the electronic switch 11, and the cooling to the circuit elements and the like mounted on the motor 5 and the circuit board portion 6 is suppressed. Efficiency is improved. Further, since the lever 422 is provided with the notch 422C, when the lever 422 rotates in the vertical direction, the lever 422 may come into contact with the switching element Q2 even when a relatively large switching element is arranged. It is suppressed.

Further, in the front-rear direction, the intervening portion 42 and the inverter circuit 96 are located at the same position. According to this, when the flow path of the cooling air extends in the front-rear direction as in the present embodiment, the intervening portion 42 is not located upstream of the flow path of the cooling air than the inverter circuit 96. Therefore, the cooling air is not blocked by the intervening portion 42 on the upstream side of the inverter circuit 96, and the cooling efficiency of the inverter circuit 96 is improved.

As shown in FIG. 8, an intervening portion holding portion 212 for holding the attached portion 421 of the intervening portion 42 is provided inside the motor housing 21. The intervening portion holding portion 212 has a pair of upper and lower rail portions 212A and 212B, a pair of upper and lower wall portions 212C and 212D, and a cylindrical portion 212E.

The pair of upper and lower rail portions 212A and 212B project inward in the radial direction of the motor housing 21 and extend in the front-rear direction. The distance between the lower surface of the rail portion 212A and the upper surface of the rail portion 212B is configured to decrease toward the front. The rail portion 212A and the rail portion 212B are formed so that the first protrusion 421B of the mounted portion 421 of the intervening portion 42 can be slid between them.

Each of the upper and lower pair of wall portions 212C and 212D has a substantially plate shape extending to the right from each of the pair of rail portions 212A and 212B. The distance between the lower surface of the wall portion 212C and the upper surface of the wall portion 212D is the same as the width of the second protrusion 421C of the attached portion 421 in the vertical direction.

The cylindrical portion 212E is provided in the radial direction of the motor housing 21 and has a substantially cylindrical shape extending in the front-rear direction. As shown in FIG. 2, the cylindrical portion 212E is a portion to which the ball bearing 21A is fitted. The curvature of the left side surface of the cylindrical portion 212E is configured to be the same as the curvature of the curved surface of the second protrusion 421C.

In the present embodiment, as shown in FIG. 8, while sliding the first protrusion 421B with respect to the pair of rail portions 212A and 212B, the second protrusion 421C is the lower surface of the wall portion 212C and the upper surface of the wall portion 212D. The intervening portion can be attached to the motor housing 21 by fitting the cylindrical portion 212E between the left side surface and the cylindrical portion 212E.

As described above, in the present embodiment, since the intervening portion 42 is supported by the motor housing 21 accommodating the motor 5, it is not necessary to provide the tail cover 22 with a mechanism for supporting the intervening portion 42. Therefore, when the electronic switch 11 is provided on the tail cover 22 as in the present embodiment, it is possible to easily secure a space for accommodating the electronic switch 11 in the tail cover 22.

Further, since the intervening portion 42 is configured to be supported by the motor housing 21 by attaching the attached portion 421 to the motor housing 21, a screw boss is provided on the motor housing 21 in which the intervening portion 42 is formed in a tubular shape. It is not necessary to screw it in, and it is possible to prevent the outer shape of the motor housing 21 from becoming large.

Further, the intervening portion 42 can be supported by the motor housing 21 with a simple configuration in which the intervening portion 421 is held by the intervening portion holding portion 212.

Next, the positional relationship between the paddle lever 41, the intervening portion 42, and the electronic switch 11 will be described with reference to FIG.

As shown in FIGS. 11 and 12, in the direction of the axis A, between the contact portion where the pressing portion 41A of the paddle lever 41 and the pressed portion 422B of the lever 422 of the intervening portion 42 come into contact with each other and the pin 423. The switch plunger 11A is located at (position B). Further, the contact portion is located between the position B and the rotation shaft 413 of the paddle lever 41. That is, the pressing portion 41A is located at a position closer to the rotation shaft 413 than the switch plunger 11A. According to this, the contact point is located at a position separated from the switch plunger 11A in the axis A direction, and the switch plunger 11A is located between the contact point and the pin 423. Therefore, the switch plunger 11A can be pushed up at the base end portion of the lever base portion 422A of the lever 422, which is closer to the pin 423 and has a smaller movement amount (rotation amount).

That is, the intervening portion can transmit the movement to the switch plunger 11A with a smaller amount of movement than the movement of the paddle lever 41 in the vertical direction passing through the position B. Therefore, even when the paddle lever 41 is configured to rotate significantly with respect to the housing 2 so as to obtain an operation feeling of pushing the paddle lever 41, the switch plunger 11A is located at the most downstream of the rotation locus of the paddle lever 41. Is not required to be arranged, and the degree of freedom in arranging the electronic switch 11 in the housing 2 is ensured.

Next, with reference to FIGS. 11 to 13, the processing work on the lumber to be processed using the disc grinding machine 1 according to the embodiment of the present invention and the operation of the disc grinding machine 1 during the processing work will be described.

First, the operator pushes the paddle lever 41 inward of the housing 2 with the power cord 2A connected to the commercial AC power supply Q. Specifically, the operator rotates the off-lock mechanism 412 in the clockwise direction against the urging force of the spring 412B, and then pushes the paddle lever 41 inward of the housing 2. Then, the paddle lever 41 rotates about the rotation shaft 413 in the clockwise direction of FIG. 11 with respect to the tail cover 22.

In this state, as shown in FIG. 12, the pressing portion 41A and the lever engaging portion 41B of the paddle lever 41 come into contact with the pressed portion 422B of the lever 422 of the intervening portion 42 and are pushed upward. Then, the lever 422 rotates about the pin 423 in the counterclockwise direction of FIG. In this state, the base end portion of the lever base 422A of the lever 422, which is closer to the pin 423 and has a smaller movement amount (rotation amount), presses the switch plunger 11A of the electronic switch 11 upward. That is, the lever 422 presses the switch plunger 11A so that the switch plunger 11A is located in the on position.

Then, electric power is supplied to the motor 5 via the electric power supply circuit 9, and the rotating shaft 51 starts rotating. When the rotating shaft 51 rotates, the pinion gear 71 fixed to the rotating shaft 51 also rotates coaxially. In this state, since the plurality of gear teeth of the pinion gear 71 and the plurality of gear teeth of the bevel gear 72 are meshed with each other, the bevel gear 72 starts rotating in the clockwise direction in a closed view. The bevel gear 72 rotates with the rotation speed of the pinion gear 71 reduced.

Further, the output shaft 81 fixed to the bevel gear 72 starts rotating integrally with the bevel gear 72. Therefore, the grindstone P attached to the output shaft 81 can be used to grind the material to be processed.

When the work is completed, the operator releases the push of the paddle lever 41 into the housing 2 inward. The paddle lever 41 rotates about the rotation shaft 413 in the counterclockwise direction shown in the figure by the urging force of the spring 411. On the other hand, the lever 422 of the intervening portion 42 rotates about the pin 423 in the clockwise direction in the figure by the urging force of the leaf spring 11B of the electronic switch 11. When the lever 422 is separated from the switch plunger 11A, the pressure on the switch plunger 11A is also released, and the switch plunger 11A moves downward.

As shown in FIG. 13, the lever 422 may not return to the original position due to the deterioration of the leaf spring 11B. However, in the present embodiment, the lever 422 returns to the position shown in FIG. 11 by engaging the lever engaging portion 41B of the paddle lever 41 and the engaged portion 422D of the lever 422 of the intervening portion 42. It is possible. In other words, the lever 422 can be returned to the position shown in FIG. 11 by the urging force of the spring 411 provided between the paddle lever 41 and the tail cover 22. That is, the lever 422 can move from the pressing position shown in FIG. 12 to the releasing position shown in FIG. 11 by transmitting the movement of the paddle lever 41 in the vertical direction. Therefore, the motor 5 can be reliably stopped.

Further, as described above, in the present embodiment, the operation in the vertical direction of the paddle lever 41 in the direction of driving the motor 5 and the operation in the direction of stopping the motor 5 are transmitted to the intervening portion 42. .. According to such a configuration, when the electronic switch 11 is turned on and off via the intervening portion 42 as in the present embodiment, the motor is suitably operated according to the operation of the operator with respect to the paddle lever 41. It can be driven or stopped.

Further, it is possible to move the intervening portion 42 and the pressing position to the releasing position by a simple configuration in which a spring 411 is provided between the paddle lever 41 and the tail cover 22.

Next, the disc grinder 100, which is an example of the working machine according to the second embodiment of the present invention, will be described with reference to FIG. The disc grinder 100 basically has the same configuration as the disc grinder 100 according to the first embodiment, and different configurations will be mainly described. Further, with respect to the same configuration as the disc grinder 1, the same effect as that described above is obtained.

The disc grinder 100 according to the second embodiment has a housing 120 instead of the housing 2, and has a filter unit 130 instead of the filter unit 3. The filter unit 130 comprises a left filter 31 and a right filter 32 configured in the same manner as the left filter 31 and the right filter 32 in the first embodiment, and a rear filter 133 different from the rear filter 33 in the first embodiment. Have. The left filter 31 is an example of the “left filter unit” in the present invention. The right filter 32 is an example of the “right filter unit” in the present invention. The rear filter 33 is an example of the "connecting filter unit" in the present invention.

The housing 120 has a tail cover 122. The tail cover 122 has a wide cylindrical shape in the left-right direction. In other words, the tail cover 122 has a substantially elliptical shape when viewed from the rear. Although not shown, a plurality of intake ports are formed on the left side surface, the right side surface, and the rear surface of the tail cover 122.

The rear filter 133 has an upper engaged portion 133C. The upper engaged portion 133C is configured to be engageable with the upper engaging portion 31A of the left filter 31 and the right filter 32. Further, the rear filter 133 is formed with an opening 133a. The opening 133a is provided with a fine metal mesh so as to suppress the intrusion of dust from the intake port formed on the rear surface of the tail cover 122 when the rear filter 133 is attached to the tail cover 122. It is configured.

As described above, both the filter unit 3 in the first embodiment and the filter unit 130 in the second embodiment are composed of filters divided into three parts. Therefore, as shown in the second embodiment, even when the shape of the tail cover is changed, the left filter 31 and the right filter 32 are connected without changing the shapes of the left filter 31 and the right filter 32. The left filter 31 and the right filter 32 can be attached to and detached from the housing having various shapes only by changing the shape of the rear filter. As a result, it is possible to reduce the cost by sharing the parts (left filter 31 and right filter 32).

In the present embodiment, the disc grinder 1 has been described as an example of the working machine, but the present invention can also be applied to a working machine driven by a motor other than the disc grinding machine.

1 ... Disc grinder 2 ... Housing 3 ... Filter part 4 ... Lever part 5 ... Motor 6 ... Circuit board part 7 ... Power transmission part 8 ... Output part 9 ... Power supply circuit 10 ... Control part 11 ... Electronic switch

Claims (12)

A housing having an intake port and an exhaust port,
A motor with a rotating shaft and
It is possible to generate an air flow for cooling the motor between the intake port portion and the exhaust port portion in the housing by rotating the rotating shaft in response to the driving force of the motor. With possible fans
A filter unit that can be attached to the housing and covers at least a part of the intake port portion to prevent dust from entering the housing from the intake port portion.
It has a fixing member that is separate from the filter portion and can be attached to the housing and engages with the filter portion.
The filter portion has a first engaging portion that can be engaged with the housing without elastic deformation, and a second engaging portion that can be engaged with the fixing member with elastic deformation. A working machine characterized in that one engaging portion engages with the housing and the second engaging portion engages with the fixing member to be fixed to the housing. The fixing member is configured to be engageable with the housing without elastic deformation, and by engaging with the housing, the movement of the fixing member with respect to the housing is restricted in a predetermined direction. The working machine according to claim 1, wherein the working machine is characterized by the above. The intake port portion has a first intake port formed on one side surface of the housing in the predetermined direction and a second intake port formed on the other side surface in the predetermined direction.
The filter unit is configured to be separable into a first filter member that covers at least a part of the first intake port and a second filter member that covers at least a part of the second intake port.
By engaging with the first filter member, the fixing member is restricted from moving in the predetermined direction with respect to the first filter member.
The working machine according to claim 2, wherein the second filter member is configured so that movement in the predetermined direction with respect to the fixing member is restricted by engaging with the fixing member. By moving the fixing member in a direction intersecting the predetermined direction, it is possible to engage or disengage the first engaging portion and the second engaging portion with the housing and the fixing member. The working machine according to claim 2 or 3, wherein the working machine is configured. The fixing member has an engaged portion that can be engaged with the second engaging portion, and has an engaged portion.
One of the second engaging portion and the engaged portion is provided with a protruding portion protruding in a predetermined direction in order to engage with the other with elastic deformation. The working machine according to claim 4. The intake port portion further has a third intake port formed at an end portion of the housing in a direction orthogonal to the predetermined direction.
The working machine according to claim 5, wherein the fixing member is a filter member having a net unit corresponding to the third intake port and covering at least a part of the third intake port. A housing having an intake port and an exhaust port,
A motor with a rotating shaft and
It is possible to generate an air flow for cooling the motor between the intake port portion and the exhaust port portion in the housing by rotating the rotating shaft in response to the driving force of the motor. With possible fans
A filter unit that can be attached to the housing and covers at least a part of the intake port portion to prevent dust from entering the housing from the intake port portion.
It has a fixing member that can be attached to the housing and can be engaged with the filter portion.
The filter portion has a claw portion that can be engaged with the intake port portion of the housing, and the claw portion is separated from the intake port portion in a state where the claw portion is engaged with the intake port portion. The claw portion is held by the intake port portion and is movable with respect to the housing between a detachable position where the claw portion can be attached and detached and a fixed position where the claw portion cannot be separated from the intake port portion.
The fixing member can engage with both the filter portion and the housing when the filter portion is in the fixed position, and the fixing member engages with both the filter portion and the housing. A working machine characterized in that the movement of the filter unit from the fixed position to the attachment / detachment position is restricted in the operating state. The claim is characterized in that the movement between the attachment / detachment position and the fixed position is performed by the rotational movement of the filter portion with respect to the housing with the engagement portion between the claw portion and the intake port portion as a base point. Item 7. The working machine according to item 7. The working machine according to claim 8, wherein when the filter portion moves from the attachment / detachment position to the fixed position, the claw portion and the intake port portion engage with each other without elastic deformation. The ninth aspect of the present invention, wherein the filter portion is configured to be divisible into two, and movement to the attachment / detachment position is restricted by engaging each of the divided filter portions with the fixing member. Working machine. A housing having an intake port and an exhaust port, a motor having a rotating shaft, and the intake port and the exhaust port in the housing by rotating on the rotating shaft in response to the driving force of the motor. A filter that can be attached to and detached from a working machine having a fan capable of generating an air flow for cooling the motor between the parts and the unit.
A filter unit that can be attached to the housing and covers at least a part of the intake port portion to prevent dust from entering the housing from the intake port portion.
It has a fixing member that is separate from the filter portion and can be attached to the housing and engages with the filter portion.
The filter portion has a first engaging portion that can be engaged with the housing without elastic deformation, and a second engaging portion that can be engaged with the fixing member with elastic deformation. A filter characterized in that one engaging portion engages with the housing and the second engaging portion engages with the fixing member to be fixed to the housing. A housing with air intakes provided on the left and right sides,
A motor with a rotating shaft and
A fan provided on the rotating shaft and introducing air for cooling the motor from the intake port portion by rotating under the driving force of the motor.
It has a filter portion that can be attached to the housing and covers at least a part of the intake port portion to prevent dust from entering the housing from the intake port portion.
The filter portion includes a right filter portion that covers a part of the intake port portion arranged on the right side surface of the housing and a left filter portion that covers a part of the intake port portion arranged on the left side surface of the housing. A working machine having a connecting filter unit that connects the right filter unit and the left filter unit in the left-right direction, and each of which can be separated from each other.

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