Dust collection equipment and work machines

Abstract

To improve dust collection performance.SOLUTION: In a dust collection part 70 of a dust collector 50, a filter chamber 90 is arranged on a back side of a cyclone mechanism 81 in a dust chamber 80, an air stream AR in which dusts are separated by the cyclone mechanism 81 flows backward in an exhaust cylinder 86 and is flown into the filter chamber 90 through an inlet opening 90C of the filter chamber 90. Inside the filter chamber 90, a filter part 92 is provided on a back side of the inlet opening 90C. The filter case 96 has a case inlet 96D opened forward and facing the inlet opening 90C in a back and forth direction; and a case outlet 96F opening upward. Thus, it is possible to suitably flow the air stream AR flow in the filter chamber 90 into the filter case 96 and to pass a filter 94. As a result, dusts in the air stream AR can be removed by the filter 94. Therefore, dust collection performance of the dust collector 50 can be improved.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present invention relates to a dust collecting device and a working machine.

Background Art

[0002] In the drilling tool (working machine) described in Patent Document 1 below, a dust collecting fan is provided so as to be integrally rotatable with the output shaft of a motor, and a dust collecting device is attached to the drilling tool. During drilling, the rotation of the dust collecting fan generates an air flow, and the dust generated during drilling is sucked into the dust collecting device by the air flow. The air flow containing the dust sucked into the dust collecting device is separated into dust and air by a filter, and the air from which the dust has been removed flows to the drilling tool side.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, in a dust collecting device, for example, by providing a cyclone mechanism on the upstream side of a filter, dust and air can be separated on the upstream side of the filter. Thereby, clogging of the filter can be suppressed. In this case, for example, for the purpose of miniaturizing the dust collecting device, if the cyclone mechanism and the filter are arranged close to each other, the air flow passage in the dust collecting device has a complicated shape, and there is a risk that the flow path resistance to the air flow increases. In this case, the dust collecting performance of the dust collecting device may deteriorate.

[0005] In consideration of the above facts, an object of the present invention is to provide a dust collecting device and a working machine capable of improving dust collecting performance.

Means for Solving the Problems

[0006] One or more embodiments of the present invention are a dust collection device detachably attached to a work machine body and used to suck up dust generated during processing of the work machine body, comprising: a nozzle section for sucking up air containing the dust from the outside; a swirling chamber having an exhaust pipe inside, which swirls the air sucked in from the nozzle section around the central axis of the exhaust pipe and discharges the air from one axial end of the exhaust pipe; a filter chamber provided on one axial side of the exhaust pipe and having an inlet opening connected to one axial end of the exhaust pipe; and a filter section provided inside the filter chamber and positioned on one axial side of the inlet opening, wherein the filter section is Ke - A case inlet formed in the case, opening to the other side in the axial direction, positioned opposite the inlet opening in the axial direction, and allowing air to flow into the interior of the case - A case inlet formed in the case, opening to one side in the intersecting direction intersecting the axial direction ,before A case outlet that allows the air to flow out towards the main body of the work machine, A filter housed in the case is positioned between the case inlet and the case outlet, It is composed of including Furthermore, the filter is positioned on one side of the central axis in the direction of the intersection. It is a dust collection device.

[0007] One or more embodiments of the present invention are dust collection devices having a partition wall separating the swirling chamber and the filter chamber, an inlet opening formed in the partition wall, and a case arranged adjacent to one side of the partition wall in the axial direction.

[0008] One or more embodiments of the present invention are, in the case described above, The filter has a side wall portion that is positioned on the other side in the axial direction and extends in the intersecting direction, The case is formed in a cylindrical shape extending in the aforementioned intersecting direction, the case outlet is formed at one end of the case in the aforementioned intersecting direction, and the case inlet is the On the front side wall This is a formed dust collection device.

[0010] One or more embodiments of the present invention are dust collection devices in which a portion of the filter is visible to the outside of the case by the case inlet and is positioned to overlap with a portion of the inlet opening when viewed from the axial direction.

[0011] One or more embodiments of the present invention are dust collection devices in which the filter is formed in a sheet shape and is folded in a pleated manner such that one side in the intersecting direction is a peak and the other side in the intersecting direction is a valley.

[0012] One or more embodiments of the present invention are dust collection devices in which the filter section is located on one side of the central axis in the direction of the intersection.

[0013] One or more embodiments of the present invention are work machines comprising a work machine body comprising a motor and a transmission mechanism for transmitting the driving force of the motor to a cutting tool, and a dust collector having the above configuration. [Effects of the Invention]

[0015] According to one or more embodiments of the present invention, dust collection performance can be improved. [Brief explanation of the drawing]

[0016] [Figure 1] This is a side view from the right, showing the hammer drill according to this embodiment. [Figure 2] Figure 1 is a cross-sectional view from the right side showing the inside of a hammer drill. [Figure 3] This is a rear-view cross-sectional view (section 3-3 in Figure 2) showing the rear area of ​​the cyclone mechanism in the dust collector shown in Figure 2. [Figure 4] Figure 2 is a cross-sectional view (section 4-4 in Figure 2) showing the area around the cyclone mechanism in the dust collector shown, viewed from above. [Figure 5] This is a rear-view cross-sectional view (section 5-5 in Figure 2) of the filter chamber of the dust collector shown in Figure 2. [Figure 6] Figure 2 is a partially broken perspective cross-sectional view taken from the right rear, showing the state in which the filter case is assembled to the rear case of the dust collection section of the dust collection device shown in the figure. [Figure 7]It is a perspective view seen from the right front, showing the filter case shown in FIG. 6.

Mode for Carrying Out the Invention

[0017] Hereinafter, the hammer drill 1 as a working machine according to the present embodiment will be described with reference to the drawings. As shown in FIGS. 1 and 2, the hammer drill 1 includes a hammer drill body 10 as a working machine body and a dust collecting device 50, and the dust collecting device 50 is detachably attached to the hammer drill body 10. Then, the dust collecting device 50 sucks the air around the tip tool T attached to the hammer drill body 10. The arrows UP, FR, and RH appropriately shown in the drawings indicate the upper side, the front side, and the right side of the hammer drill 1. In the following description, when the up-down, front-back, and left-right directions are used for explanation, unless otherwise specified, they indicate the up-down, front-back, and left-right directions of the hammer drill 1. First, the hammer drill body 10 will be described below, and then the dust collecting device 50 will be described.

[0018] (Regarding the hammer drill body 10) The hammer drill body 10 is configured as a power tool for performing drilling work or the like on a workpiece. The hammer drill body 10 includes a housing 20, a motor 34, and a transmission mechanism 40 that transmits the driving force of the motor 34 to the tip tool T.

[0019] (Regarding the housing 20) The housing 20 constitutes the outer shell of the hammer drill body 10. The housing 20 includes a main body housing 21 that constitutes the front part of the housing 20 and a handle housing 24 that constitutes the rear part of the housing 20. The main body housing 21 is formed in a substantially reverse L shape when viewed from the right side. Specifically, the main body housing 21 includes a lower housing portion 22 that constitutes the lower part of the main body housing 21 and an upper housing portion 23 that constitutes the upper part of the main body housing 21. The rear end portion of the upper housing portion 23 is connected to the upper end portion of the lower housing portion 22, and the upper housing portion 23 protrudes forward from the lower housing portion 22. A dust collection port 22A is formed through the front wall at the upper end portion of the lower housing portion 22 in the front-rear direction. A plurality (five locations in this embodiment) of exhaust ports 23A are formed through the left and right side walls at the rear end portion of the upper housing portion 23. The exhaust ports 23A are formed in a substantially long hole shape with the front-rear direction as the longitudinal direction and are arranged side by side in the up-down direction.

[0020] The handle housing 24 extends in the up-down direction, and the upper end portion and the lower end portion of the handle housing 24 are bent forward and connected to the rear end portion of the main body housing 21. Note that the lower end portion of the lower housing portion 22 protrudes below the handle housing 24.

[0021] A trigger 30 is provided at the upper end portion of the handle housing 24. The trigger 30 protrudes forward from the handle housing 24 and is configured to be pulled rearward. A switch mechanism 31 is provided at the rear side of the trigger 30 in the handle housing 24. The switch mechanism 31 has a switch (not shown) that is operated by the trigger 30. The switch is electrically connected to a controller 32 provided at the lower end portion of the lower housing portion 22 and outputs an output signal corresponding to the operation state of the trigger 30 to the controller 32. A battery pack 33 is mounted at the lower end portion of the handle housing 24, and power is supplied from the battery pack 33 to a motor 34 and the controller 32, which will be described later.

[0022] (Regarding motor 34) The motor 34 is configured as a three-phase brushless motor and is housed in the lower housing portion 22 of the main housing 21. Specifically, the motor 34 is positioned above the controller 32 and is electrically connected to the controller 32. The motor 34 has an output shaft 34A whose axis is oriented vertically. The lower end of the output shaft 34A is rotatably supported by a motor bearing 35 fixed to the lower housing portion 22, and the upper end portion of the output shaft 34A is rotatably supported by a motor bearing 36 held by a bearing holding portion 41A of the inner housing 41 of the transmission mechanism 40, which will be described later. A pinion gear 34B is formed at the upper end of the output shaft 34A.

[0023] A fan 37 is integrally rotatable at the middle of the output shaft 34A in the vertical direction. The fan 37 is formed as a roughly disc shape with the vertical direction as the thickness direction and is configured as a centrifugal fan. The fan 37 is positioned diagonally below and behind the dust collection port 22A of the main body housing 21. When the fan 37 rotates together with the output shaft 34A, air from the upper side of the fan 37 flows into the interior of the fan 37 from the center of the upper part of the fan 37, and the incoming air flows radially outward and upward of the fan 37 and is exhausted from the exhaust port 23A. This generates an airflow AR that flows into the main body housing 21 from the dust collection port 22A.

[0024] (Regarding transmission mechanism 40) The transmission mechanism 40 is configured as a mechanism that transmits the rotational force of the motor 34 to the tip tool T and drives the tip tool T. The transmission mechanism 40 consists of an inner housing 41, an intermediate shaft 42, and a transmission section 47, and is housed in the upper housing section 23 of the main body housing 21 and is positioned in front of the exhaust port 23A.

[0025] The inner housing 41 is formed in a substantially bottomed elliptical shape that is open to the front. The inner housing 41 is positioned above the motor 34 so as to partition the rear end of the upper housing portion 23 in the front-rear direction. Specifically, the inner housing 41 is positioned close to the front of the exhaust port 23A. A bearing retaining portion 41A is formed at the lower end of the inner housing 41, and the bearing retaining portion 41A is formed in a substantially stepped cylindrical shape that is open to the bottom. The upper end of the output shaft 34A of the motor 34 is inserted into the bearing retaining portion 41A, and the motor bearing 36 is held in the bearing retaining portion 41A.

[0026] The intermediate shaft 42 is formed in a substantially cylindrical shape with its axial direction in the front-rear direction, and its front and rear ends are rotatably supported by bearings 43 and 44 fixed to the main body housing 21. A bevel gear 45 is integrally rotatably mounted on the rear end of the intermediate shaft 42, and the bevel gear 45 meshes with the pinion gear 34B of the output shaft 34A. As a result, when the motor 34 is driven and the output shaft 34A rotates, the intermediate shaft 42 rotates around its own axis. A motion conversion member 46 is provided on the intermediate shaft 42, and the motion conversion member 46 is configured to convert the rotational motion of the intermediate shaft 42 into reciprocating motion in the front-rear direction, thereby applying a striking force to the transmission unit 47, which will be described later.

[0027] The transmission unit 47 extends in the front-rear direction above the intermediate shaft 42. The tip tool T is attached to the front end of the transmission unit 47. The tip tool T is formed in a substantially cylindrical shape with the front-rear direction as its axial direction, and the rear end of the tip tool T is attached to the transmission unit 47. The transmission unit 47 is also connected to the intermediate shaft 42. As a result, the rotational force of the motor 34 is transmitted to the tip tool T, causing the tip tool T to rotate around its own axis and perform drilling on the workpiece. In addition, a striking force is applied by the motion conversion member 46, which imparts a striking force to the tip tool T.

[0028] (Regarding the dust collector 50) As shown in Figures 1 and 2, the dust collector 50 is formed in a roughly rectangular box shape overall. The dust collector 50 is positioned in front of the lower housing portion 22 of the main housing 21 and is assembled to the main housing 21. The dust collector 50 consists of a discharge portion 52, a cover 56, an air inlet portion 60, and a dust collection portion 70.

[0029] (Regarding the discharge section 52) As shown in Figure 2, the discharge section 52 constitutes the rear end of the upper part of the dust collector 50. The discharge section 52 is formed in a cylindrical shape that is open to the rear, and its rear end is inserted from the front into the dust collection port 22A of the hammer drill body 10. The front end of the discharge section 52 is bent downwards and also opens downwards. The front end of the discharge section 52 is positioned above the case outlet 96F of the filter case 96, which will be described later, and the filter case 96 (filter chamber 90) and the inside of the discharge section 52 are in communication. A connecting pipe 54 is provided on the front side of the discharge section 52, and the connecting pipe 54 is formed integrally with the discharge section 52. The connecting pipe 54 is formed in a substantially cylindrical shape with the front-to-back direction as its axial direction, and its rear end is bent downwards.

[0030] (Regarding cover 56) As shown in Figures 1 to 5, the cover 56 constitutes the upper outer casing of the dust collector 50. The cover 56 is composed of two cover members divided in the left-right direction, and the cover 56 is formed by assembling the divided cover members together. Specifically, the cover members sandwich the discharge section 52 from both the left and right sides, fixing the discharge section 52 in place. Furthermore, the rear end of the cover 56 protrudes further back than the dust collection section 70, which will be described later, so that it is positioned on both the left and right sides of the lower housing section 22 of the hammer drill body 10.

[0031] The front of the cover 56 has a roughly cylindrical cover section 56A with its axial direction in the front-to-back direction. The front end of the cover section 56A is positioned in front of the hammer drill body 10. The lower end of the cover section 56A has a connecting section 56B for connecting the divided cover members, and the connecting section 56B is formed in a roughly cylindrical shape with its axial direction in the left-to-right direction.

[0032] (Regarding the air inlet 60) As shown in Figures 1 and 2, the air inlet 60 constitutes the front part of the upper section of the dust collector 50. The air inlet 60 is configured as a mechanism that draws in air from around the front end of the tip tool T and discharges the air to the dust collection section 70, which will be described later. The air inlet 60 includes a slide arm 62, a nozzle connecting member 64, an intake pipe 66, and a suction nozzle 68 as a nozzle section.

[0033] The slide arm 62 is formed in a substantially rectangular cylindrical shape with the front-to-back direction as its axial direction. The slide arm 62 is housed within the cover cylindrical portion 56A of the cover 56 and is slidably connected to the cover cylindrical portion 56A in the front-to-back direction, with the front end of the slide arm 62 protruding forward of the cover cylindrical portion 56A.

[0034] The nozzle connecting member 64 is formed in a substantially rectangular cylindrical shape with its vertical direction as its axis. The lower end of the nozzle connecting member 64 is bent towards the rear, forming a substantially cylindrical shape when viewed from the rear. The lower end of the nozzle connecting member 64 is positioned within the front end of the slide arm 62 and is fixed to the slide arm 62.

[0035] The intake pipe 66 is formed in a substantially cylindrical shape with its axial direction in the front-rear direction. The intake pipe 66 is made of an expandable rubber material or the like and is configured to expand and contract in the front-rear direction. The intake pipe 66 is located inside the slide arm 62, with the front end of the intake pipe 66 connected to the lower end of the nozzle connecting member 64 and the rear end of the intake pipe 66 connected to the front end of the connecting pipe 54.

[0036] The suction nozzle 68 comprises a nozzle body 68A and a nozzle exhaust section 68B. The nozzle body 68A is formed in a cylindrical shape with its axial direction in the front-to-back direction. The nozzle body 68A is positioned coaxially with the tip tool T, and the tip of the tip tool T is inserted through the inside of the nozzle body 68A. The nozzle exhaust section 68B is formed in a substantially rectangular cylindrical shape with its axial direction in the up-to-down direction and extends downward from the nozzle body 68A. The inside of the nozzle exhaust section 68B and the inside of the nozzle body 68A are in communication. The nozzle exhaust section 68B is fitted into the nozzle connecting member 64 from above and assembled to the nozzle connecting member 64 by claw engagement. As a result, the airflow AR generated when the hammer drill body 10 is in operation exhausts the air inside the nozzle body 68A from the nozzle exhaust section 68B to the intake pipe 66 and sends it to the dust collection section 70.

[0037] (Regarding the dust collection unit 70) As shown in Figures 1 to 6, the dust collection unit 70 is formed in the shape of a roughly rectangular box and is detachably attached to the cover 56 on the lower side of the connecting pipe 54. The dust collection unit 70 has a front case 72 that forms the outer casing of the front part of the dust collection unit 70, a rear case 74 that forms the outer casing of the rear part of the dust collection unit 70, and a dust collection lid 76 that forms the outer casing of the front end of the dust collection unit 70. The front case 72 and the rear case 74 are assembled together and, in the assembled state, the front case 72 and the rear case 74 are formed in the shape of a roughly box that opens to the front. The dust collection lid 76 is provided on the front end of the front case 72 so as to be openable and closable. The dust collection lid 76 is formed in the shape of a roughly rectangular plate with the thickness direction roughly in the front-to-back direction. The lower end of the dust collection lid 76 is rotatably connected to the lower front end of the front case 72 with the left-to-right direction as the axial direction, and the upper end of the dust collection lid 76 is locked to the upper wall of the front case 72. As a result, the front opening of the front case 72 is closed by the dust collection cover 76. In addition, a locking groove 76A that opens to the front is formed at the upper end of the dust collection cover 76. When the dust collection unit 70 is attached to the cover 56, the connecting portion 56B of the cover 56 is positioned within the locking groove 76A, and the front end of the dust collection unit 70 is locked to the cover 56.

[0038] Furthermore, the dust collection unit 70 is connected to the aforementioned discharge unit 52 and connecting pipe 54, and the airflow AR flows into the dust collection unit 70 from the connecting pipe 54, and the airflow AR that has passed through the dust collection unit 70 is discharged to the discharge unit 52. The dust collection unit 70 has a dust collection chamber 80 and a filter chamber 90, and the dust in the airflow AR is collected in the dust collection unit 70 as the airflow AR passes through the dust collection chamber 80 and the filter chamber 90. In other words, the dust collection chamber 80 constitutes the upstream part within the dust collection unit 70, and the filter chamber 90 constitutes the downstream part within the dust collection unit 70 (see Figure 2).

[0039] The filter chamber 90 constitutes the rear part of the upper section of the dust collection unit 70, and the dust collection chamber 80 constitutes the part of the dust collection unit 70 other than the filter chamber 90. That is, the front wall 90A and the lower wall 90B of the filter chamber 90 are formed inside the dust collection unit 70, and the filter chamber 90 and the dust collection chamber 80 are separated by the front wall 90A and the lower wall 90B of the filter chamber 90 (see Figure 6). The front wall 90A corresponds to the partition wall of the present invention, and the front wall 90A and the lower wall 90B are formed in the rear case 74.

[0040] (Regarding dust collection chamber 80) A cyclone mechanism 81 is provided above the dust collection chamber 80, in front of the filter chamber 90. The cyclone mechanism 81 includes a pair of left and right cyclone outer cylinders 82, a cyclone inlet 85, and a pair of left and right exhaust pipes 86.

[0041] (Regarding the Cyclone Outer Cylinder 82) The pair of cyclone outer cylinders 82 are positioned symmetrically with respect to the left-right center of the dust collection unit 70. The cyclone outer cylinders 82 as a whole are formed in a substantially cylindrical shape with the front-rear direction as the axial direction, and the central axis of the cyclone outer cylinders 82 is the cyclone axis 82A. The cyclone outer cylinders 82 also include a rear outer cylinder 83 which constitutes the rear part of the cyclone outer cylinder 82 and a front outer cylinder 84 which constitutes the front part of the cyclone outer cylinder 82.

[0042] The rear outer cylinder 83 is formed in a cylindrical shape centered on the cyclone shaft 82A and protrudes forward from the front wall 90A of the filter chamber 90. The inner diameter of the rear outer cylinder 83 is set to be constant in the front-rear direction, and the inner circumferential surface of the rear outer cylinder 83 is arranged parallel to the cyclone shaft 82A.

[0043] The front outer cylinder 84 is formed in a substantially cylindrical shape centered on the cyclone shaft 82A, and the side walls of the front outer cylinder 84 are inclined to approach the cyclone shaft 82A as they move towards the front. The front outer cylinder 84 is formed integrally with the front case 72. Specifically, the outer circumference of the front outer cylinder 84 is connected to the left and right side walls of the front case 72, and the rear ends of the pair of left and right front outer cylinders 84 are connected at the central part of the dust collection section 70 in the left-right direction. The inner diameter of the rear end of the front outer cylinder 84 is set to be larger than the inner diameter of the rear outer cylinder 83, and the front end of the rear outer cylinder 83 is positioned inside the rear end of the front outer cylinder 84. The inside of the cyclone outer cylinder 82 is configured as a swirling chamber 82B.

[0044] (Regarding the cyclone inlet section 85) The cyclone inlet 85 is formed in a substantially rectangular cylindrical shape with its vertical direction as the axial direction, and extends upward from the left-right inner portion (the left-right central side of the dust collection section 70) of the rear ends of the pair of left and right rear outer cylinders 83, and is positioned adjacent to the lower side of the rear end opening of the connecting pipe 54. The inside of the cyclone inlet 85 is in communication with the rear outer cylinders 83.

[0045] When air flows into the rear outer cylinder 83 from the rear end opening of the connecting pipe 54 via the cyclone inlet 85, the air that flows into the rear outer cylinder 83 is configured to flow forward while swirling along the inner circumferential surface of the rear outer cylinder 83. In addition, the air that flows out from the front end of the rear outer cylinder 83 into the front outer cylinder 84 is configured to flow forward while swirling along the inner circumferential surface of the front outer cylinder 84. As a result, air and dust are separated in the swirling chamber 82B, and the dust is discharged from the front end opening of the front outer cylinder 84 and accumulates on the lower surface of the dust collection chamber 80.

[0046] (Regarding exhaust pipe 86) The exhaust pipes 86 are each located inside a pair of rear outer cylinders 83. The exhaust pipes 86 are formed in a cylindrical shape with the cyclone shaft 82A as the center and protrude forward from the front wall 90A of the filter chamber 90. In other words, the cyclone shaft 82A constitutes the central axis of the exhaust pipe 86. The exhaust pipes 86 also penetrate in the front-to-back direction. That is, an inlet opening 90C is formed through the front wall 90A of the filter chamber 90, connecting the exhaust pipe 86 and the filter chamber 90, and the dust collection chamber 80 and the filter chamber 90 are in communication through the inlet opening 90C. The air separated from the dust in the swirling chamber 82B flows to the rear inside the exhaust pipes 86 and enters the filter chamber 90.

[0047] (Regarding filter chamber 90) The filter chamber 90 is located at the rear of the cyclone mechanism 81 (on one axial side of the cyclone shaft 82A). Specifically, the filter chamber 90 and the dust collection chamber 80 (swirl chamber 82B) are separated front to back by the front wall 90A of the filter chamber 90, and the filter chamber 90 and the dust collection chamber 80 are separated vertically by the lower wall 90B of the filter chamber 90. The lower wall 90B of the filter chamber 90 is formed in an uneven shape when viewed from the front to back and is connected to the rear outer cylinder 83. Specifically, a roughly semicircular recess that opens upward is formed in the lower wall 90B, and the lower wall 90B is smoothly connected to the lower part of the rear outer cylinder 83. In addition, the filter chamber 90 as a whole is formed in a box shape that opens upward. Specifically, an outlet opening 90D that opens upward is formed at the upper end of the filter chamber 90, and the outlet opening 90D is located below the front end opening of the discharge section 52.

[0048] A filter section 92 is provided in the filter chamber 90. The filter section 92 includes a filter 94 and a filter case 96 which constitutes the outer casing of the filter section 92 and houses the filter 94. As shown in Figure 7, the filter case 96 is formed in a substantially rectangular cylindrical shape with the vertical direction as the axial direction and the horizontal direction as the longitudinal direction. The filter case 96 is inserted from above through the outlet opening 90D of the filter chamber 90 and assembled to the upper part of the filter chamber 90. When the filter case 96 is assembled to the filter chamber 90, the outer shape of the filter case 96 is set so that the outer circumferential surface of the filter case 96 is positioned adjacent to the inside of the inner circumferential surface of the filter chamber 90. In other words, the filter section 92 is provided in the filter chamber 90 so as to fill the upper part of the filter chamber 90.

[0049] The filter case 96 is provided with a pair of left and right engaging plates 96A on its outer side in the left-right direction. The engaging plates 96A are formed in a substantially rectangular plate shape with the left-right direction being the thickness direction and the up-down direction being the longitudinal direction. The upper ends of the engaging plates 96A are bent inward in the left-right direction of the filter case 96 and connected to the upper ends of the filter case 96. The engaging plates 96A are positioned on the outside of the left and right side walls of the filter chamber 90, and the lower ends of the engaging plates 96A are engaged with the side walls by claw engagement, thereby maintaining the assembled state of the filter case 96.

[0050] The lower end surface of the filter case 96 is located above the cyclone axis 82A and below the upper end of the inlet opening 90C in the vertical direction (see Figure 5). The lower parts of the front wall 96B and rear wall 96C of the filter case 96 have a recessed case inlet portion 96D that opens downwards, and the case inlet portion 96D extends over almost the entire length of the filter case 96 in the left-right direction. That is, the lower parts of the front wall 96B and rear wall 96C of the filter case 96 are gouged out by the case inlet portion 96D and open outwards in the front-rear direction. The upper end of the case inlet portion 96D is located above the inlet opening 90C (see Figures 5 and 6). As a result, the lower end of the case inlet portion 96D and the upper end of the inlet opening 90C are positioned opposite each other in the front-rear direction.

[0051] As described above, the filter case 96 is formed in a substantially rectangular cylindrical shape with the vertical direction as its axial direction. Therefore, a lower end opening 96E that opens downwards is formed at the lower end of the filter case 96, and a case outlet portion 96F that opens upwards is formed at the upper end of the filter case 96. That is, the case outlet portion 96F opens to one side (upwards) in the direction of intersection (in this embodiment, the vertical direction) that intersects with the cyclone axis 82A. The upper end of the filter case 96 protrudes upwards from the outlet opening 90D of the filter chamber 90, and the case outlet portion 96F is positioned opposite the front end opening of the discharge portion 52 in the vertical direction. In addition, retaining ribs 96H that protrude inwards in the left-right direction and extend in the front-rear direction are formed at the lower ends of the left and right side walls of the filter case 96. When viewed from the front-rear direction, the retaining ribs 96H are positioned radially outside the inlet opening 90C so that the retaining ribs 96H and the inlet opening 90C do not overlap (see Figure 5). Furthermore, the filter case 96 is configured to be symmetrical with respect to its front-to-back intermediate section. In other words, it is configured so that the filter case 96 can be assembled into the filter chamber 90 even when it is inverted in the front-to-back direction.

[0052] The filter 94 is made of nonwoven fabric or the like, formed in a sheet shape, and folded into a pleated shape. Specifically, in a side view, the mountain folds of the filter 94 form the upper end of the filter 94, and the valley folds of the filter 94 form the lower end of the filter 94, so that the filter 94 is folded into a pleated shape and overlaps in the front-to-back direction. The filter 94 is housed in the filter case 96 and is positioned above the retaining rib 96H. The lower end of the filter 94 is exposed to the outside in the front-to-back direction by the case inlet 96D of the filter case 96 and is exposed to the bottom in a viewable direction by the lower end opening 96E. As described above, since the lower end surface of the filter case 96 is positioned above the cyclone shaft 82A, the entire filter 94 is positioned above the cyclone shaft 82A. Furthermore, the lower end of the filter 94 is positioned below the upper end of the inlet opening 90C, and when viewed from the front-to-back direction, the lower end of the filter 94 and the upper end of the inlet opening 90C overlap (see Figure 5).

[0053] Then, the airflow AR that flows into the filter chamber 90 from the inlet opening 90C of the filter chamber 90 flows directly into the lower end of the filter case 96 through the case inlet 96D and the lower end opening 96E of the filter case 96. In addition, the airflow AR passes through the filter 94 and flows from the case outlet 96F of the filter case 96 to the discharge section 52 and into the main body housing 21 of the hammer drill body 10.

[0054] (Effects and Benefits) When drilling with the hammer drill 1 configured as described above, the operator pulls the trigger 30 on the hammer drill body 10, which drives the motor 34 and causes the tip tool T to rotate around its axis. This allows drilling to be performed on the workpiece. Specifically, the tip tool T is pressed against the workpiece to perform drilling.

[0055] Furthermore, when the motor 34 is driven, the fan 37 rotates along with the output shaft 34A of the motor 34. This generates an airflow AR from the dust collector 50 toward the hammer drill body 10. Specifically, in the suction nozzle 68 of the dust collector 50, an airflow AR is generated that draws the air inside the nozzle body 68A toward the nozzle exhaust section 68B (see Figure 2).

[0056] As a result, the air surrounding the tip of the cutting tool T is drawn into the dust collector 50. That is, dust surrounding the cutting tool T, including dust generated during drilling, is drawn in along with the air from the suction nozzle 68 through the intake pipe 66 into the connecting pipe 54. The airflow AR that flows into the connecting pipe 54 flows from the rear end of the connecting pipe 54 into the cyclone inlet 85 of the dust collection unit 70, and from the cyclone inlet 85 into the cyclone outer cylinder 82 (see Figure 3). The airflow AR that flows into the cyclone outer cylinder 82 flows forward along the inner circumferential surface of the cyclone outer cylinder 82, while swirling around the axis of the cyclone shaft 82A (see Figure 4). As a result, the air and dust are separated inside the cyclone outer cylinder 82, and the separated dust is discharged from the front end opening of the cyclone outer cylinder 82 and falls to the bottom surface of the dust collection chamber 80. Furthermore, the airflow AR that flows out from the front opening of the cyclone outer cylinder 82 flows towards the rear through approximately the center of the cyclone outer cylinder 82 and enters the exhaust pipe 86. The airflow AR that has entered the exhaust pipe 86 then flows into the filter chamber 90 through the inlet opening 90C of the filter chamber 90 (see Figure 4).

[0057] The airflow AR that flows into the filter chamber 90 enters the interior of the filter case 96 through the case inlet 96D and the lower end opening 96E of the filter case 96, and flows upward (towards the case outlet 96F) while passing through the filter 94 of the filter case 96. Then, the airflow AR flows from the case outlet 96F of the filter case 96 to the discharge section 52 and enters the main body housing 21 of the hammer drill body 10 (see Figure 2). As a result, any dust remaining in the airflow AR is removed by the filter 94.

[0058] In the dust collection section 70 of the dust collector 50, the filter chamber 90 is located behind the cyclone mechanism 81 of the dust collection chamber 80. The airflow AR, from which dust has been separated by the cyclone mechanism 81, flows backward through the exhaust pipe 86 and enters the filter chamber 90 through the inlet opening 90C. Inside the filter chamber 90, a filter section 92 is provided behind the inlet opening 90C. The filter case 96, which constitutes the outer casing of the filter section 92, has a case inlet section 96D that opens forward and faces the inlet opening 90C in the front-rear direction, and a case outlet section 96F that opens upward. This allows the airflow AR that has entered the filter chamber 90 to flow well into the filter case 96 and pass through the filter 94. As a result, dust in the airflow AR can be removed by the filter 94. Therefore, the dust collection performance of the dust collector 50 can be improved.

[0059] In other words, for example, if the case inlet 96D of the filter case 96 is omitted, a portion of the inlet opening 90C will be blocked by the front wall 96B of the filter case 96. Also, when the airflow AR flows into the filter chamber 90 from the inlet opening 90C, the direction of the airflow AR is changed downwards by the front wall 96B of the filter case 96, and then changed upwards. That is, the airflow AR will flow around (bypass) the underside of the filter case 96. As a result, the flow resistance for the airflow AR in the filter chamber 90 will increase, and there is a possibility that the airflow AR flowing into the filter chamber 90 will not be able to pass through the filter 94 properly. In this case, the dust collection performance of the dust collector 50 may decrease.

[0060] In contrast, in the dust collector 50 of this embodiment, as described above, the filter case 96 has a case inlet portion 96D that opens to the front and faces the inlet opening 90C in the front-rear direction, and a case outlet portion 96F that opens to the top. Therefore, the front wall 96B of the filter case 96 is prevented from blocking the inlet opening 90C by the case inlet portion 96D, while the airflow AR can be directly taken into the filter case 96 from the inlet opening 90C. In addition, the airflow AR is prevented from circling around to the bottom of the filter case 96, and the airflow AR that has flowed into the filter case 96 can be directed smoothly toward the case outlet portion 96F. As a result, the airflow AR that has flowed into the filter chamber 90 can be directed smoothly into the filter case 96 and pass through the filter 94. Therefore, the dust collection performance of the dust collector 50 can be improved.

[0061] Furthermore, as described above, the filter section 92 is located behind the inlet opening 90C. Specifically, the lower end of the filter section 92 is positioned behind the upper end of the inlet opening 90C, so that when viewed from the rear, the lower end of the filter section 92 (filter 94) and the upper end of the inlet opening 90C overlap. Therefore, compared to a configuration in which the cyclone mechanism 81 is shifted downwards so that the filter 94 and the inlet opening 90C do not overlap in the vertical direction, this configuration contributes to reducing the vertical size of the dust collector 50.

[0062] Furthermore, the front wall 90A of the filter chamber 90 in the dust collection section 70 separates the filter chamber 90 and the dust collection chamber 80 in the front-to-back direction, and an inlet opening 90C is formed in the front wall 90A. The filter case 96 is positioned adjacent to the rear side of the front wall 90A. In other words, the filter section 92 and the front wall 90A are positioned without any gap in the front-to-back direction. Therefore, compared to a configuration in which the front wall 90A is positioned at a distance from the filter case 96 to the front so as to form a gap between the filter section 92 and the front wall 90A, the size of the dust collector 50 in the front-to-back direction can be reduced.

[0063] Furthermore, the filter case 96 is formed in a rectangular cylindrical shape with the vertical direction as its axial direction, and the case inlet portion 96D is formed at the lower ends of the front wall 96B and the rear wall 96C of the filter case 96. This allows the inlet opening 90C and the case inlet portion 96D to be positioned opposite each other front to back, preventing the lower end of the filter case 96 from blocking the inlet opening 90C, even when the filter case 96 is assembled in an inverted state. Therefore, incorrect assembly of the filter case 96 can be prevented, and the ease of assembly of the filter case 96 can be improved. Also, as described above, since the filter case 96 is formed in a rectangular cylindrical shape with the vertical direction as its axial direction, almost the entire lower end of the filter case 96 can be opened downwards. Therefore, the airflow AR that flows into the filter chamber 90 from the inlet opening 90C can flow into the filter case 96 from the lower end opening 96E of the filter case 96.

[0064] Furthermore, the filter 94 is positioned above the cyclone axis 82A (i.e., the central axis of the exhaust pipe 86 and the inlet opening 90C). Therefore, compared to a configuration where, for example, the filter 94 is positioned below the cyclone axis 82A, the flow resistance of the airflow AR flowing into the filter chamber 90 can be reduced. Consequently, the airflow AR flowing into the filter chamber 90 from the inlet opening 90C can pass through the filter 94 effectively, and dust in the airflow AR can be removed by the filter 94.

[0065] Furthermore, the lower end of the filter 94 is exposed to the front by the case inlet 96D so that it can be seen, and is positioned so as to overlap with the upper end of the inlet opening 90C when viewed from the rear. Therefore, the airflow AR that flows into the filter chamber 90 from the inlet opening 90C can be directly directed to the lower end of the filter 94. [Explanation of symbols]

[0066] 1. Hammer drill (working tool) 10. Hammer drill body (working tool body) 34 Motors 40 Transmission mechanism 68 Suction nozzle (nozzle part) 82A Cyclone shaft (central shaft) 82B Swing Chamber 86 Exhaust stack 90 Filter Room 90A Front wall (partition wall) 90C inlet opening 92 Filter section 94 filters 96 Filter Case (Case) 96D Case entrance 96F Case exit section

Claims

1. A dust collection device that is detachably attached to the main body of the work machine and sucks up dust generated during processing of the main body of the work machine, A nozzle section for sucking in air containing the aforementioned dust from the outside, A swirling chamber having an exhaust pipe inside, which swirls the air drawn in from the nozzle section around the central axis of the exhaust pipe and discharges the air from one end of the exhaust pipe in the axial direction, A filter chamber provided on one side of the exhaust pipe in the axial direction and having an inlet opening connected to the axial end of the exhaust pipe, A filter section provided inside the filter chamber and positioned on one side of the inlet opening in the axial direction, Equipped with, The filter unit is The case and, A case inlet is formed in the case, is open to the other side in the axial direction, is positioned opposite the inlet opening in the axial direction, and allows air to flow into the interior of the case, The case has a case outlet portion formed in it, which is open on one side in a direction intersecting the axial direction, and which allows the air to flow out toward the main body of the work machine, A filter housed in the case is positioned between the case inlet and the case outlet, It is composed of including, The filter is a dust collector positioned on one side of the central axis in the direction of the intersection.

2. The dust collector has a partition wall separating the swirling chamber and the filter chamber, and the inlet opening is formed in the partition wall. The dust collection device according to claim 1, wherein the case is arranged adjacent to one side of the partition wall in the axial direction.

3. The case has a side wall portion that is positioned on the other side in the axial direction relative to the filter and extends in the intersecting direction, and is formed in a cylindrical shape that extends in the intersecting direction. The case outlet portion is formed at one end of the case in the intersecting direction, The dust collection device according to claim 2, wherein the case inlet is formed on the other side wall.

4. The dust collection device according to claim 3, wherein a part of the filter is visible to the outside of the case by the case inlet and is positioned to overlap with a part of the inlet opening when viewed from the axial direction.

5. The dust collection device according to claim 4, wherein the filter is formed in a sheet shape and is folded in a pleated shape such that one side in the intersecting direction is a peak and the other side in the intersecting direction is a valley.

6. The dust collection device according to claim 5, wherein the filter portion is located on one side of the central axis in the direction of the intersection.

7. A work machine body comprising a motor and a transmission mechanism for transmitting the driving force of the motor to a cutting tool, A dust collection device according to any one of claims 1 to 6, A vehicle used for construction work.

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