TWI566890B - Pneumatic tools - Google Patents

Description

Pneumatic tool

BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a pneumatic tool relating to a pneumatic tool having a pneumatic motor that is rotationally driven by compressed air, and more specifically, in the air supply flow path for supplying compressed air to a pneumatic motor. Remove foreign matter contained in compressed air.

The following pneumatic tools are widely used: a rotary air-type motor or a piston-type reciprocating air motor driven by a compressed air supply source from an external compressed air supply source to drive a drive coupled to the air motor The driven member such as the head, the drill, the polishing pad, or the like is driven. For example, Patent Document 1 discloses an air drill which rotationally drives a jig that holds and fixes a drill by a rotary air motor of a vane type. Further, Patent Document 2 discloses a reciprocating tool that reciprocally drives a tool holding portion to which a saw blade or the like is attached by a piston type reciprocating air motor.

In the above pneumatic tools, in order to prevent wear of the vanes or pistons of the air motor, lubricating oil is applied to the air motor. In addition, the compressed air supplied to the air motor contains lubricating oil to chase the lubricating oil. It is supplied to the air motor so that there is no gradual reduction in the lubricating oil in the air motor when the pneumatic tool is continuously used. As described above, by sufficiently maintaining the lubricating oil in the state of the air motor at any time, not only the wear of the vane or the piston is prevented, but also the oil film is used to wrap the air motor so that there is no such thing as the compressed air. Moisture causes rust in the air motor.

[Previous Technical Literature] [Patent Literature]

[Patent Document 1] License No. 4295228

[Patent Document 2] License No. 4551302

In general, the compressed air is supplied to the pneumatic tool in a state where foreign matter such as dust or water droplets is removed by various filters disposed in the pipe. However, it is difficult to maintain the compressed air supplied to the pneumatic tool at a state where no foreign matter is contained, and foreign matter may be mixed into the pneumatic tool. When the mixed foreign matter reaches the inside of the air motor, there is a case where the damage of the vane or the piston due to the foreign matter causes the life of the air motor to be reduced. Therefore, it is desirable to prevent foreign matter from entering the air motor as much as possible.

Moreover, in recent years, it has been developed to drive without lubrication. Dynamic pneumatic tools. In the above pneumatic tool, since the vane or the piston of the pneumatic tool is not covered with the lubricating oil, the possibility that the foreign matter is mixed into the air motor further increases the damage of the vane or the piston due to the foreign matter. Sex, but the life of the air motor is greatly shortened. Therefore, in a pneumatic tool that can be driven without lubricating oil, it is more important that foreign matter is not mixed into the air motor.

The present invention has been made in view of the above problems in the prior art, and an object thereof is to provide a pneumatic tool for removing foreign matter contained in compressed air supplied to a pneumatic motor.

That is, the present invention provides a pneumatic tool comprising: a pneumatic motor; a tool body, a tool body housing the air motor, and an air supply for supplying compressed air from a compressed air supply source to the air motor a flow path, and an air exhaust flow path for discharging compressed air from the air motor to the outside of the tool body; and an air swirling means to swirl the compressed air flowing in the air supply flow path to generate a swirling flow; And the cylindrical wall is disposed on the downstream side of the air swirling means in the air supply passage, and is disposed inside the inner peripheral surface of the air supply passage and between the inner peripheral surface and the inner peripheral surface a cylindrical wall forming a cylindrical dust collecting space, which is disposed such that an upstream end portion of the dust collecting space is open and downstream The side end portion is closed.

In the pneumatic tool, since the compressed air supplied to the air motor is formed into a swirling flow in the air supply flow path by the air swirling member, solid or liquid foreign matter such as dust or water contained in the compressed air is Since it is moved to the vicinity of the inner peripheral surface of the air supply flow path by the centrifugal force and concentrated in the dust collecting space, the amount of foreign matter reaching the air motor can be reduced. Thereby, the life of the air motor can be increased.

Specifically, the air swirling means can be an air swirling member having a spiral groove portion disposed in the air supply flow path.

Preferably, the tool body further includes a dust discharge flow path extending from an inlet opening portion that opens in the dust collecting space to an outlet opening portion that communicates with the outside of the tool body.

By providing the dust discharge flow path, foreign matter concentrated in the dust collecting space can be discharged from the dust collecting space.

It is preferable to further include a discharge operation valve that is disposed in the tool body and that is displaceable between a closed position at which the dust discharge flow path is closed and an open position in which the dust discharge flow path is opened.

By providing the discharge operation valve, it is possible to flow the compressed air through the dust discharge flow path only when it is necessary to discharge the foreign matter from the dust collecting space. That is, the compressed air for discharge can be discharged without waste regardless of whether or not the air motor is driven.

Preferably, it can be further provided with: a driving operation a valve, which is disposed in the tool body and is capable of displaceing between a stop position at which the air supply flow path is closed and a drive position in which the air supply flow path is opened, at the stop position and the drive When the position is displaced, the discharge operating valve is displaced from the closed position to the open position.

More preferably, the discharge operation valve is formed in the closed position when the drive operation valve position is at the stop position and the drive position.

With the above configuration, since the discharge operation valve is also operated by the driving or stopping of the pneumatic tool with the operation of the drive operation valve, it becomes unnecessary to individually operate the discharge operation valve.

Preferably, the drive operation valve opens the air supply flow path when the drive operation valve displaces the discharge operation valve to the open position.

Since the air in the dust collecting space can be discharged in a state where the swirling flow is generated in the air supply flow path, the foreign matter can be discharged more efficiently.

Preferably, the drive operation valve has a drive operation valve body that is sealingly engaged with a supply flow path valve seat portion provided in the air supply flow path, and a drive operation valve body from the drive operation valve body. a drive operation valve shaft extending in the displacement direction, and an engagement projection protruding from an outer circumferential surface of the drive operation valve shaft, the discharge operation valve having a sealing engagement with a discharge flow path seat portion provided in the dust discharge flow path Discharge the operating valve body, and from the discharge operation a discharge operation valve shaft extending in a displacement direction of the discharge operation valve, and when the drive operation valve is displaced between the stop position and the drive position, the engagement protrusion is engaged with the discharge operation valve shaft And the discharge operating valve is displaced from the closed position to the open position.

More preferably, the drive operation valve is disposed on the downstream side of the dust collecting space.

More preferably, the inlet opening portion of the dust discharge passage is disposed at a position spaced apart from the upstream side from the downstream end portion of the dust collecting space.

It is understood that the foreign matter concentrated in the dust collecting space is distributed more at a position slightly upstream from the downstream end portion of the dust collecting space due to the relationship of the air flow in the dust collecting space. Therefore, by providing the inlet opening portion of the dust discharge passage at a position spaced apart from the upstream side by the downstream end closing portion, the foreign matter can be discharged more efficiently.

Preferably, the dust collecting filter provided in the air exhaust flow path is further provided, and the outlet opening portion of the dust discharge flow path is more toward the dust collecting filter of the air exhaust flow path. The upstream side is open.

According to the above configuration, since the air containing the foreign matter is discharged to the outside through the dust collecting filter, it is possible to prevent the external environment from being contaminated by the exhaust of the pneumatic tool.

Preferably, the tool body has a flow path forming portion that extends the air supply flow path and the air exhaust flow path in parallel, and covers the flow path. a grip portion of the component portion, and a cross-sectional shape of an inner circumferential surface of at least a portion of the air supply flow path in which the dust collecting space is formed is formed as a circle, and the dust discharge flow path has a direction from the inlet opening portion a first passage extending in the flow path forming portion of the circular tangential direction, a second passage that communicates with the first passage and is formed on an outer surface of the flow path forming portion, and is covered by the grip cover, and the second passage The second passage that communicates with the two passages and extends into the outlet passage portion in the flow passage forming portion.

Hereinafter, embodiments of the pneumatic tool disclosed by the present invention will be described with reference to the accompanying drawings.

10‧‧‧ pneumatic tools (gas drill)

12‧‧‧Air motor

12a‧‧‧Rotor

12b‧‧‧Motor housing

12c‧‧‧Leaves

12d‧‧‧Exhaust port

12e‧‧‧Motor drive shaft

14‧‧‧Tool body

14a‧‧‧Flow Formation

14b‧‧‧ grip cover

16‧‧‧Clamp

18‧‧‧ bearing

20‧‧‧Reversing switching valve

22‧‧‧ latch

24‧‧‧ pinion

26‧‧‧ external teeth

28‧‧‧ internal teeth

30‧‧‧ gas supply port

32‧‧‧Exhaust port

34‧‧‧Air supply flow path

34a‧‧‧ inner circumference

34b‧‧‧Central Flow Path

36‧‧‧Air exhaust flow path

36a‧‧‧Upstream part of the exhaust flow path

36b‧‧‧Downstream of the exhaust flow path

38‧‧‧ Male connector

40‧‧‧Air swing member

40a‧‧‧Spiral groove

42‧‧‧Cylindrical wall

44‧‧‧Dust space

44a‧‧‧ upstream side

44b‧‧‧ downstream side end

46‧‧‧Drive operating valve

46a‧‧‧Drive operating valve body

46b‧‧‧Drive operating valve shaft

46c‧‧‧ Pressing the operation department

46d‧‧‧ snap protrusion

48‧‧‧Supply flow valve seat

50‧‧‧ dust filter

52‧‧‧Dust discharge flow path

52a‧‧‧ entrance opening

52b‧‧‧1st pathway

52c‧‧‧2nd pathway

52d‧‧‧3rd pathway

52e‧‧‧Export opening

54‧‧‧Exhaust operation valve

54a‧‧‧Draining valve body

54b‧‧‧Draining valve shaft

54c‧‧‧Helical spring

56‧‧‧Draining flow valve seat

R‧‧‧Rotation center axis

Fig. 1 is a side cross-sectional view showing a pneumatic tool according to an embodiment of the present invention.

Fig. 2 is a perspective view showing an air swirling member.

Fig. 3 is a cross-sectional view taken along line III-III of Fig. 1.

Fig. 4A is a first view showing the operation of the drive operation valve and the discharge operation valve, and is a view when the drive operation valve position is at the stop position and the discharge operation valve position is at the closed position.

Fig. 4B is a second view showing the operation of the drive operation valve and the discharge operation valve, and is a view when the drive operation valve position is between the stop position and the open position and the discharge operation valve position is at the open position.

Figure 4C shows the operation of the drive operation valve and the discharge operation valve. 3 figures, and is a diagram of the drive operating valve position in the open position and the discharge operating valve position in the closed position.

The pneumatic tool 10 disclosed in the embodiment of the present invention, as shown in Fig. 1, is an air drill 10 having a rotary air motor 12 of a vane type, a tool body 14 for housing the air motor 12, and a tool. The tip end of the main body 14 is held by a jig 16 that is rotatable and rotationally driven by the air motor 12, and is drilled by a drill (not shown) that is rotationally driven by the jig 16 and fixed.

The air motor 12 includes a rotor 12a that is rotatably supported around the rotation center axis R by the front and rear bearings 18, a cylindrical motor case 12b that houses the rotor 12a, and a rotor 12a that is housed in the rotor 12a. A plurality of vanes 12c (only one of which is shown in Fig. 1) that can slide in the radial direction of the rotor 12a. The motor housing 12b is provided with first and second air supply and exhaust ports (not shown) and an exhaust port 12d. The compressed air system is formed such that it is possible to select which one of the first and second supply and exhaust ports is to be supplied by the forward reverse switching valve 20. When the compressed air is supplied into the motor casing 12b through the first air supply and exhaust port, the compressed air rotates the rotor 12a in the normal rotation direction and is discharged from the second supply and exhaust port and the exhaust port 12d. When the compressed air is supplied into the motor casing 12b through the second air supply and exhaust port, the compressed air rotates the rotor 12a in the reverse direction, and is discharged from the first air supply port and the exhaust port 12d. That is, the air motor 12 is formed to be capable of The reverse valve 20 is being reversed to switch forward and reverse.

The clamp 16 is mounted with a pin 22 that is press-fitted and fixed to a rear end portion of the tool body 14, and a pinion gear 24 that is held to be rotatable around the pin 22 freely. The pinion gear 24 is configured to be engaged with both the outer teeth 26 of the motor drive shaft 12e integrally formed with the rotor 12a of the air motor 12, and the inner teeth 28 fixed and held inside the tool body 14. Therefore, when the air motor 12 is driven, the pinion gear 24 is formed to rotate around the pin 22 while also revolving around the rotation center axis R of the air motor 12. By rotating the pinion gear 24 about the rotation center axis R, the jig 16 is also rotationally driven around the rotation center axis R.

The lower end of the tool body 14 is provided with an air supply port 30 that receives compressed air from a compressed air supply source (not shown), and an exhaust port 32 that discharges compressed air after use. The lower half of the tool body 14 is formed as a flow path forming portion 14a that forms an air supply flow path 34 extending from the air supply port 30 to the air motor 12 in parallel, and extending from the air motor 12 to the exhaust port 32. Air exhaust flow path 36. Further, a rubber grip 14b is attached around the flow path constituting portion 14a so that the operator can easily hold it. The male connector 38 is fixed to the air supply port 30, and is coupled to the compressed air supply source by connecting it to a corresponding female connector (not shown) connected to the compressed air supply source. connection.

The air swirling member 40 is disposed in the air supply flow path 34. The air swirling member 40 is formed on the outer periphery thereof as shown in Fig. 2 The plurality of spiral groove portions 40a on the surface cause the compressed air passing through the air swirling member 40 to swirl in the direction of the spiral groove portion 40a to generate a swirling flow. A cylindrical wall 42 positioned further inside than the inner peripheral surface 34a of the air supply passage 34 is disposed at a position on the downstream side of the air swirling member 40 in the air supply passage 34. The inner peripheral surface 34a of the air supply passage 34 between the air swirling member 40 and the cylindrical wall 42 has a cross-sectional shape formed into a circle, and a cylindrical shape is formed between the cylindrical wall 42 and the inner peripheral surface 34a. Dust collection space 44. The upstream side end portion 44a of the dust collecting space 44 is opened in a ring shape, and the downstream side end portion 44b is closed. Further, the inner side of the cylindrical wall 42 is formed with a central flow path 34b that is coupled to the air motor 12. A drive operation valve 46 for opening and closing a switch of the air supply flow path 34 is disposed on the downstream side of the dust collecting space 44. The drive operation valve 46 has a drive operation valve body 46a that is sealingly engaged with the supply flow path valve seat portion 48 provided in the air supply flow path 34, and a drive operation valve that extends from the drive operation valve body 46a to the tool body 14. The shaft 46b and a pressing operation portion 46c that is fixed to an end portion that drives the operation valve shaft 46b. The drive operation valve 46 is formed in a stop position in which the air supply flow path 34 is closed in the direction along the drive operation valve shaft 46b by press-fitting the pressing operation portion 46c toward the tool body 14 side (Fig. 4A) The displacement is until the open position (Fig. 4C) where the air supply flow path 34 is opened. Further, in a state where compressed air is supplied into the air supply flow path 34, the drive operation valve 46 is displaced from the open position to the closed position by the pressure of the compressed air.

The air exhaust passage 36 is formed so as to extend from the exhaust passage upstream portion 36a extending downward from the exhaust port 12d of the air motor 12 The middle view drive operation valve 46 is turned back toward the deep side until the exhaust port 32 connected to the exhaust flow path downstream portion 36b. The exhaust gas flow path downstream portion 36b is provided with a dust collecting filter 50 that is mounted to be exchangeable.

The tool body 14 is further formed with a dust discharge flow path 52 that extends between the dust collecting space 44 of the air supply flow path 34 and the exhaust flow path downstream portion 36b of the air exhaust flow path 36. As shown in FIG. 3, the dust discharge passage 52 is formed by a passage that extends from the inlet opening 52a that opens in the dust collecting space 44 toward the side surface of the flow path forming portion 14a of the tool body 14. 52b, the second passage 52c that is in communication with the first passage 52b and formed between the flow path forming portion 14a and the grip cover 14b, and the second passage 52c that communicates with the second passage 52c and extends in the flow path forming portion 14a until the air is discharged. The flow path 36 is the third passage 52d up to the opening outlet opening 52e. The first passage 52b extends from the inlet opening portion 52a in the tangential direction of the inner peripheral surface 34a of the air supply passage 34. In the middle of the third passage 52d, a discharge operation valve 54 for opening and closing the dust discharge passage 52 is disposed. The discharge operation valve 54 includes a discharge operation valve body 54a that is sealingly engaged with the discharge flow path valve seat portion 56 provided in the dust discharge flow path 52, and a drive operation valve shaft that is driven from the discharge operation valve body 54a toward the drive operation valve 46. The discharge operation valve shaft 54b extending from 46b and the coil spring 54c for pressing the discharge operation valve body 54a and the discharge operation valve shaft 54b to seal the engagement operation valve body 54a and the discharge flow path valve seat portion 56.

When compressed air from a compressed air supply source is supplied to the air drill 10, the drive operation valve 46 is maintained at the stop position shown in Fig. 4 by the pressure of the compressed air. At this time, the discharge operation valve 54 will The closed position is formed by sealing the engagement valve body 54a and the discharge flow path seat portion 56 by the pressing force of the coil spring 54c to close the dust discharge passage 52. Next, when the pressing operation portion 46c of the drive operation valve 46 is pressed in against the pressure of the compressed air, as shown in Fig. 4B, the drive operation valve body 46a is separated from the supply flow path seat portion 48 to set the air. The supply flow path 34 is open. Then, the annular engagement projection 46d provided in the drive operation valve shaft 46b is engaged with the distal end of the discharge operation valve shaft 54b, and the discharge operation valve shaft 54b and the discharge operation valve body 54a are moved downward to cause discharge. The operating valve 54 is displaced from the closed position to the open position. At the open position, the sealing engagement between the discharge operation valve body 54a and the discharge flow path valve seat portion 56 is released to open the dust discharge flow path 52. The air supply flow path 34 is opened by the drive operation valve 46, whereby the compressed air supplied from the air supply port 30 (Fig. 1) at the lower end of the tool body 14 starts to flow, and passes through the air swirling member 40 (Fig. 1 The compressed air is formed to flow in the air supply flow path 34 as a swirling flow. Further, the dust discharge passage 52 is opened by the discharge operation valve 54, whereby the compressed air also flows through the dust discharge passage 52 from the dust collecting space 44 and flows through the air exhaust passage 36. When foreign matter is contained in the compressed air to be supplied, the foreign matter is formed to be concentrated on the inner peripheral surface of the air supply flow path 34 by the centrifugal force generated by the swirling flow in the air supply flow path 34 to the outside. Near 34a, it is guided into the dust collecting space 44. The compressed air containing foreign matter guided to the dust collecting space 44 is further guided to the air exhaust flow path 36 through the dust discharge flow path 52. The collected foreign matter is captured by the dust collecting filter 50, and the air is discharged from the exhaust port 32 to the outside. unit. On the other hand, the compressed air flowing near the center of the swirling flow of the air supply flow path 34 passes through the inner central flow path 34b of the cylindrical wall 42, and is further guided to the air motor by driving the operation valve 46. 12. When the pressing operation portion 46c is further pushed in from the state of FIG. 4B, the driving operation valve 46 is formed into an open position as shown in FIG. 4C, and the air drill 10 is formed to: a predetermined amount of compressed air It is supplied to the air motor 12 and uses a predetermined output to rotationally drive the driving state of the jig 16 and the drill bit. At this time, since the engagement projection 46d of the drive operation valve shaft 46b moves to a position beyond the front end of the discharge operation valve shaft 54b, the discharge operation valve 54 is again displaced to the closed position by the elastic thrust of the coil spring 54c. Therefore, in this state, the foreign matter concentrated in the dust collecting space 44 due to the centrifugal force generated by the swirling flow is not discharged from the dust collecting space 44, but is slowly stored in the dust collecting space 44. When the force of pressing the operation portion 46c is released, the drive operation valve 46 returns to the stop position of FIG. 4A from the drive position of FIG. 4C via the state of FIG. 4B by the pressure of the compressed air. Therefore, when the drive operation valve 46 is in the position of FIG. 4B, the discharge operation valve 54 is formed in an open position, and foreign matter stored in the dust collection space 44 is discharged from the dust collection space 44 via the dust discharge flow path 52.

The outer portion of the compressed air that is formed into the swirling flow by the air swirling member 40 flows into the dust collecting space 44. However, since the downstream side end portion 44b of the dust collecting space 44 is closed, it is impossible on the downstream side. It will flow more upwards and will flow backwards toward the upstream side. On the other hand, since the compressed air formed as the swirling flow flows from the upstream side end portion 44a, The countercurrent compressed air and the compressed air from the upstream side are formed to collide in the middle. By generating the flow of the air in the dust collecting space 44, the foreign matter in the dust collecting space 44 is formed to be concentrated at a position slightly spaced from the upstream side from the downstream side end portion 44b. By the distribution of the foreign matter, the inlet opening portion 52a of the dust discharge passage 52 is provided at a position spaced apart from the upstream side from the downstream end portion 44b of the dust collecting space 44, and the foreign matter can be discharged more efficiently. Further, the position at which the foreign matter is concentrated is due to the shape of the spiral groove portion 40a of the air swirling member 40, the distance between the air swirling member 40 and the dust collecting space 44, the diameter of the air supply flow path 34, and the compression of the supply. Since various conditions such as the pressure of the air change, the position of the inlet opening portion 52a is also set at an appropriate optimum position in accordance with the above conditions.

As described above, in the air drill 10, the compressed air supplied to the air motor 12 is formed into a swirling flow in the air supply flow path 34 by the air swirling member 40, so that dust or water contained in the compressed air is generated. The foreign matter moves to the vicinity of the inner peripheral surface 34a of the air supply flow path 34 by the centrifugal force, and is concentrated in the dust collecting space 44. Thereby, since the foreign matter contained in the compressed air until reaching the air motor 12 is reduced, the possibility that the air motor 12 is damaged by foreign matter can be reduced, and the life of the air motor 12 can be increased. In addition, since the foreign matter concentrated in the dust collecting space 44 is formed to be discharged at the start of the driving of the air drill 10 and at the time of stopping, the foreign matter in the dust collecting space 44 is periodically discharged. On the other hand, in the driving of the air drill 10, it is not possible to discharge from the dust collecting space 44, and the output of the air drill 10 can be kept constant without excessively discharging the compressed air.

In the above embodiment, both of the displacement operation valve 54 is temporarily displaced to the open position when the drive operation valve 46 is displaced from the stop position to the open position and from the open position to the stop position, but only the displacement operation valve 54 may be temporarily displaced. The discharge operation valve 54 may be temporarily displaced to the open position at either of the positions, or the discharge operation valve 54 may be held in the open position in the drive air motor 12. Further, although the discharge operation valve 54 is formed to be displaced in conjunction with the drive operation valve 46, the discharge operation valve 54 can be independently operated, and the foreign matter in the dust collection space 44 can be appropriately discharged in accordance with the judgment of the operator. In addition, the dust discharge flow path 52 is formed such that the outlet opening 52e opens in the air exhaust flow path 36 and communicates with the outside of the tool body 14 via the air exhaust flow path 36, but the outlet opening can also be made. The 52e opens directly outside the tool body 14.

Further, in the above-described embodiment, the swirling flow is generated by swirling the compressed air flowing in the air supply passage 34, and the air swirling member 40 having the spiral groove portion 40a is disposed in the air supply passage 34. The swirling flow can also be generated by other means. For example, the air supply flow path itself may be curved in a form of a swirling shape to generate a swirling flow.

As an embodiment of the pneumatic tool 10 disclosed in the present invention, the air drill 10 using the rotary air motor 12 of the bucket type as a driving source will be described. However, for example, it can be used as a torque wrench or a grinder. Pneumatic tools. Further, as the drive source, it is also possible to use a compressed air supplied into the cylinder to reciprocate the piston in the cylinder. A pneumatic motor of another form such as a plug type reciprocating air motor.

10‧‧‧ pneumatic tools (gas drill)

12‧‧‧Air motor

12a‧‧‧Rotor

12b‧‧‧Motor housing

12c‧‧‧Leaves

12d‧‧‧Exhaust port

12e‧‧‧Motor drive shaft

14‧‧‧Tool body

14a‧‧‧Flow Formation

14b‧‧‧ grip cover

16‧‧‧Clamp

18‧‧‧ bearing

20‧‧‧Reversing switching valve

22‧‧‧ latch

24‧‧‧ pinion

26‧‧‧ external teeth

28‧‧‧ internal teeth

30‧‧‧ gas supply port

32‧‧‧Exhaust port

34‧‧‧Air supply flow path

34a‧‧‧ inner circumference

34b‧‧‧Central Flow Path

36‧‧‧Air exhaust flow path

36a‧‧‧Upstream part of the exhaust flow path

36b‧‧‧Downstream of the exhaust flow path

38‧‧‧ Male connector

40‧‧‧Air swing member

40a‧‧‧Spiral groove

42‧‧‧Cylindrical wall

44‧‧‧Dust space

44a‧‧‧ upstream side

44b‧‧‧ downstream side end

46‧‧‧Drive operating valve

46a‧‧‧Drive operating valve body

46b‧‧‧Drive operating valve shaft

46c‧‧‧ Pressing the operation department

46d‧‧‧ snap protrusion

48‧‧‧Supply flow valve seat

50‧‧‧ dust filter

52a‧‧‧ entrance opening

52e‧‧‧Export opening

54‧‧‧Exhaust operation valve

54a‧‧‧Draining valve body

54b‧‧‧Draining valve shaft

54c‧‧‧Helical spring

56‧‧‧Draining flow valve seat

R‧‧‧Rotation center axis

Claims (12)

A pneumatic tool comprising: a pneumatic motor; a tool body, a tool body housing the air motor, and an air supply flow path for supplying compressed air from a compressed air supply source to the air motor, and for The compressed air from the air motor is discharged to an air exhaust flow path outside the tool body; the air swirling means swirls the compressed air flowing in the air supply flow path to generate a swirling flow; and the cylindrical wall is tied A position on the downstream side of the air swirling means in the air supply passage is disposed on the inner side of the inner peripheral surface of the air supply passage, and a cylindrical dust collecting space is formed between the air supply passage and the inner peripheral surface. The cylindrical wall is disposed such that an upstream end portion of the dust collecting space is opened and a downstream end portion is closed, and the tool body further includes: a dust discharge flow path opening from the dust collecting space The inlet opening portion extends to the outlet opening portion communicating with the outside of the tool body, and the compressed air passing through the dust discharge passage reaches the air without passing through the air motor External tool body. The pneumatic tool according to claim 1, wherein the air swirling means is an air swirling member having a spiral groove portion disposed in the air supply flow path. The pneumatic tool according to claim 2, further comprising: a discharge operation valve disposed in the tool body and capable of opening the dust discharge flow path at a closed position where the dust discharge flow path is closed The displacement between the open positions is made. The pneumatic tool according to claim 3, further comprising: a drive operation valve disposed in the tool body and capable of closing the air supply flow path and the air supply flow path A drive operating valve that is displaced between the open drive positions displaces the discharge operating valve from the closed position to the open position when displaced between the stop position and the drive position. The pneumatic tool of claim 4, wherein the discharge operation valve is formed in the closed position when the drive operation valve is in the stop position and the drive position. The pneumatic tool of claim 4, wherein the drive operation valve opens the air supply flow path when the drive operation valve displaces the discharge operation valve to the open position. The pneumatic tool according to any one of claims 4 to 6, wherein the drive operation valve has a drive operation that is sealingly engaged with a supply flow path seat portion provided in the air supply flow path. a valve body, a drive operation valve shaft extending from the drive operation valve body toward a displacement direction of the drive operation valve, and an engagement protrusion protruding from an outer peripheral surface of the drive operation valve shaft, the discharge operation valve having: a discharge operation valve body in which the discharge flow path valve seat portion of the dust discharge flow path is sealed and engaged, and a discharge operation valve shaft extending from the discharge operation valve body toward the displacement direction of the discharge operation valve, when the drive operation valve is stopped When the position is displaced from the drive position, the engagement projection is engaged with the discharge operation valve shaft and the discharge operation valve is displaced from the closed position to the open position. As stated in any of items 4 to 6 of the patent application scope The movable tool, wherein the drive operation valve is disposed on a downstream side of the dust collecting space. The pneumatic tool according to any one of the first to sixth aspects of the present invention, wherein the inlet opening portion of the dust discharge passage is disposed between the downstream end portion and the upstream side of the dust collecting space. The location of the interval. The pneumatic tool according to any one of claims 1 to 6, further comprising a dust collecting filter provided in the air exhaust passage, wherein the outlet opening of the dust discharge passage is The dust collecting filter of the air exhaust flow path is opened toward the upstream side. The pneumatic tool according to claim 10, wherein the tool body has a flow path forming portion that extends the air supply flow path and the air exhaust flow path in parallel, and covers the flow a grip sleeve of the path forming portion, and a cross-sectional shape of an inner circumferential surface of at least a portion of the air supply flow path in which the dust collecting space is formed is formed as a circle, and the dust discharge flow path has a direction from the inlet opening portion a first passage extending in the flow path forming portion of the circular tangential direction, a second passage that communicates with the first passage and is formed on an outer surface of the flow path forming portion, and is covered by the grip cover, and The second passage communicates with the third passage extending to the outlet opening portion in the flow path forming portion. A pneumatic tool comprising: a pneumatic motor; a tool body, a tool body housing the air motor, and having a compressed air for supplying a compressed air supply source to the air motor An air supply flow path and an air exhaust flow path for discharging compressed air from the air motor to the outside of the tool body; the air swirling member has a conical portion that tapers toward the upstream side, and a spiral groove formed around the conical portion on the downstream side of the conical portion, and disposed in the air supply flow path to swirl the compressed air flowing in the air supply flow path to generate a swirling flow And a cylindrical wall that is disposed further downstream than the inner circumferential surface of the air supply flow path at a position on the downstream side of the air supply flow path, and is disposed inside the inner circumferential surface of the air supply flow path The cylindrical wall in which the cylindrical dust collecting space is formed is disposed such that the upstream side end portion of the dust collecting space is opened and the downstream side end portion is closed.