TW201924871A - Airway switching structure for pneumatic rotary tool preventing inconvenient operation of the conventional pneumatic rotary tool - Google Patents

Abstract

The present invention provides an airway switching structure for a pneumatic rotary tool, which includes a casing having an air chamber capable of collecting high-pressure air. Two ends of the casing are respectively provided with a tool joint and an air inlet communicating with the air chamber. A pneumatic motor is fixed in the casing. The pneumatic motor has an output shaft coupled to the tool joint. The casing is further pivotally provided therein with a rotary valve. The rotary valve is located between the pneumatic motor and the air chamber. A rotating ring is pivotally arranged on a wall of the casing adjacent to the air inlet. The rotary ring rotates the rotary valve via a sleeve pivoted in the casing to switch forward or reverse rotation of the pneumatic motor. Thus, the present invention can solve the problem of inconvenient operation of the conventional pneumatic rotary tool caused by the arrangement of the position of the rotary ring being too close to the tool joint.

Description

Pneumatic switching structure of pneumatic rotary hand tool

The invention relates to a pneumatic hand tool for a twist lock and a loose object, in particular to a pneumatic switch structure of a pneumatic rotary hand tool.

Pneumatic rotary hand tools generally provide the operator with a twist lock and a loose nut or bolt. The tool body is usually equipped with a pneumatic motor for receiving high-pressure air to generate a rotational kinetic energy output. In the process of outputting the rotational kinetic energy, the outputting of the tapping kinetic energy is generally performed, so that the tightening force between the threads can be increased by the tapping kinetic energy when the nut or the bolt is locked, and the nut is removed or By bolting, the bolting kinetic energy can be used to accelerate the engagement between the loose threads.

It is also known that in order to twist and loosen a nut or bolt, the pneumatic rotary hand tool must have the ability to rotate forward and reverse with the output of the rotary kinetic energy of the tap. This ability depends on the high-pressure air accumulated in the tool body. It must be able to drive the air motor to generate forward and reverse rotations. Therefore, the tool body must have a forward and reverse air path that facilitates the operator to switch the high-pressure air.

As shown in FIG. 1, a structural arrangement technique of a typical conventional pneumatic rotary hand tool is disclosed, which comprises a casing 10a which is supported by a handle housing 101a, a motor housing 102a and a head housing 103a. The valve housing 101a is formed with a gas chamber for collecting high-pressure air. The air motor is fixed in the motor housing 102a, and the motor housing 102a is also provided with a rotary valve. The rotary valve is used for switching the high-pressure air into the forward or reverse air path, thereby driving the air motor to rotate forward or reverse. The head housing 103a is internally provided with a tool joint for connecting the socket wrench. The motor is located between the tool joint and the air chamber, and the output shaft of the air motor is coupled with the tool joint; further, the shell wall of the shell 10a The upper pivot is provided with a rotating ring 50a. The rotating ring 50a is located between the handle housing 101a and the motor housing 102a. The operator can rotate the rotating ring 50a by hand to drive the rotary valve to switch high-pressure air. The gas circuit switching structure for the pneumatic rotary hand tool described above is disclosed in Taiwan Patent Publication Nos. I453077 and I481484.

However, due to the above-mentioned typical conventional pneumatic rotary hand tool, the rotary ring 50a is located between the handle housing 101a and the motor housing 102a, that is, the rotary ring 50a is located close to the tool joint; This is not conducive to the operator switching the pneumatic rotary hand tool forward and reverse when twisting and unscrewing the nut or bolt; more specifically, the operator usually uses a pneumatic rotary hand tool to perform the twist lock and the screw When the cap or bolt is operated, the position of the nut or bolt to be locked or loosened is often too narrow, and the pneumatic rotating hand tool needs to be inserted into the narrow space (such as somewhere in the vehicle chassis) to lock and By loosening the nut or bolt, the operator is easily obstructed by the narrow space, which causes the inconvenience when the rotary ring is rotated by hand to switch the forward and reverse rotation of the pneumatic rotary hand tool; The arrangement position of the rotary ring 50a on the conventional pneumatic rotary hand tool tends to be inconvenient to operate due to being too close to the tool joint, and therefore needs to be improved.

SUMMARY OF THE INVENTION It is an object of the present invention to improve the position of the dial ring of a conventional pneumatic rotary hand tool which is prone to operational inconvenience due to being too close to the tool joint.

To this end, a preferred embodiment of the present invention provides a pneumatic circuit switching structure for a pneumatic rotary hand tool, comprising: a housing, forming a hollow shell column along a shaft line, and having a high voltage capable of collecting in the housing a gas chamber, one end of the shell is pivotally provided with a tool joint, and the other end of the shell is provided with an air inlet communicating with the air chamber; a pneumatic motor is fixed in the shell and located at the tool a joint between the joint and the air chamber, and the air motor has a power output shaft coupled to the tool joint; a rotary valve pivoted along the shaft line in the housing and located between the air motor and the air chamber And a rotating ring, which is adjacently disposed on the outer wall of the air inlet opening along the axis of the shaft, and the rotating ring can be rotated by a sleeve pivoted in the housing The turn The valve rotates forward or reverse with a switching air motor, and the sleeve is located between the rotary valve and the rotating ring.

In a further implementation, the housing is formed by a handle housing, a motor housing and a housing connected in series along the axis line. The air chamber is formed in the handle housing. The air motor is fixed in the motor housing, and the tool joint is pivotally disposed in the head housing. The air inlet is opened at one end of the handle housing away from the motor housing, and the rotating ring is adjacently disposed on a seat of the handle housing at the periphery of the air inlet.

In a further implementation, the housing is formed by a pair of handle housings and a housing that are sequentially and serially connected along the axis of the shaft. The air chamber is formed in the handle housing, the air motor and The tool joints are respectively disposed in the head housing. The air inlet is opened at one end of the handle housing away from the head housing, and the rotating ring is adjacently disposed on the wall of the handle housing on the periphery of the air inlet.

In a further implementation, the output shaft of the air motor is coaxially disposed along the axis of the shaft. The output shaft of the air motor is coupled to the tool joint to form an angle.

In a further implementation, the output shaft of the air motor is disposed coaxially along the axis of the shaft. The output shaft of the air motor is coupled to the axial line to form an angle. The output shaft of the air motor is coaxially coupled to the tool joint.

In a further implementation, the inside of the rotary valve forms an air guiding channel along the axial line, and the rotating valve is formed at each of the two ends of the axial line to form an air supply end surface and an air inlet end surface, and the air supply end surface is adjacent to the pneumatic air a motor, and the air guiding passage communicates with the air chamber via the air inlet end surface. The air supply end face is formed with an air supply port that communicates with the air guiding channel and an air outlet that communicates with the atmosphere. An exhaust hole communicating with the atmosphere is formed on one side wall of the casing, and the exhaust port communicates with the atmosphere via the exhaust hole.

In a further implementation, a guide disc is disposed in the housing, the guide disc is located between the air motor and the rotary valve, and the air motor and the rotary valve are connected to each other via the guide disc. The disc has a forward-rotating air inlet for guiding the high-pressure air to drive the air motor to rotate forward, and a guide air for guiding the high-pressure air to drive the air motor Turn the reverse air intake. An elastic member is disposed between the rotary valve and the air chamber, and the rotary valve is pressed by the elastic member to press against a side surface of the deflector.

According to the above, the technical effect of the present invention is that the rotary ring is disposed at the end of the pneumatic rotary hand tool, and more specifically, the rotary ring is located adjacent to the air inlet to facilitate the operator to switch the pneumatic Rotating the hand tool forwards and reverses, especially when the pneumatic rotary hand tool is extended into a narrow space to lock and unscrew the nut or bolt.

10a, 10b, 10c‧‧‧ shell

101a, 101b, 101c‧‧‧ handle housing

102a, 102b‧‧‧ motor housing

103a, 103b, 103c‧‧‧ head shell

11‧‧‧Axis line

12‧‧‧ air chamber

13‧‧‧ inlet

14‧‧‧ gas valve

15‧‧‧clamp switch

16‧‧‧ venting holes

17‧‧‧Sleeve

171‧‧‧Bolt hole

18‧‧‧Travel arc hole

19‧‧‧ bolt

20‧‧‧Air motor

21‧‧‧Rotor

22‧‧‧ blades

23‧‧‧Output shaft

30‧‧‧turn valve

31‧‧‧ air guiding channel

32‧‧‧ gas supply end face

33‧‧‧Inlet end face

34‧‧‧ gas supply port

35‧‧‧Exhaust port

40‧‧‧Exhaust ring

41‧‧‧Exhaust manifold

50a, 50b‧‧‧ring ring

51‧‧‧ card slot

60‧‧‧Flexible components

70‧‧‧Board

71‧‧‧ Forward air intake

72‧‧‧Reverse air intake

80‧‧‧ airtight cushion

90‧‧‧Tool connector

θ 1, θ 2‧‧‧ angle

1 is a perspective view of a conventional pneumatic rotary hand tool; FIG. 2 is a perspective view of a first embodiment of the pneumatic rotary hand tool of the present invention; FIG. 3 is a cross-sectional view of FIG. 2; Figure 5 is a cross-sectional view of the BB section of Figure 3; Figure 6 is a schematic view of the gas path when the high-pressure air-driven air motor is rotating forward; Figure 7 is a schematic view of the gas path when the high-pressure air-driven air motor is reversed; Figure 8 is a cross-sectional view showing a second embodiment of the pneumatic rotary hand tool of the present invention.

Referring to FIG. 2 to FIG. 5, the configuration details of the first embodiment of the present invention are disclosed, and the pneumatic circuit switching structure of the pneumatic rotary hand tool of the present invention is illustrated, which includes a casing 10b, a pneumatic motor 20, and a rotary valve. 30 and a rotary ring 50b, wherein: as shown in FIG. 2 and FIG. 3, the casing 10b is formed as a hollow shell column along an axial line 11 and serves as a grip of a hand tool. In a specific implementation, in order to consider the convenience when assembling the air motor 20 and the rotary valve 30, the housing 10b can be sequentially arranged along a shaft line 11 by a handle housing 101b, a motor housing 102b and a head housing 103b. The series connection is locked to form a gas chamber 12 for collecting high pressure air in the handle housing 101b of the housing 10b, and a high pressure air connection is provided at one end of the handle housing 101b away from the motor housing 102b. Intake port 13; in a preferred embodiment, the air inlet 13 can be located at the end of the pneumatic rotating hand tool to facilitate high pressure The air joint can communicate with the air chamber 12 via the air inlet 13 to allow high pressure air to be introduced into the air chamber 12.

An air valve 14 is disposed at one end of the air chamber 12, and a side wall surface of the handle housing 101b is provided with a buckle switch 15 for the operator to press and release by hand; when the operator presses the buckle switch At 15 o'clock, the air valve 14 can be opened, so that high-pressure air can be introduced into the air chamber 12 from the air inlet 13 of the handle housing 101b away from one end of the motor housing 102b; conversely, when the operator releases the buckle switch 15, the air can be turned off. The valve 14 is introduced into the plenum 12 to block high pressure air from the inlet port 13 of the handle housing 101b away from one end of the motor housing 102b.

A mounting hole in the shape of a ladder column is formed in the motor housing base 102b, so that the air motor 20 and the rotary valve 30 can be serially mounted in the mounting hole of the motor housing base 102b along the axis line 11. An exhaust hole 16 communicating with the atmosphere is formed on one side wall of the motor housing 102b of the housing 10b; in a specific implementation, the motor housing 102b can form a row on the outer wall of the exhaust hole 16 a gas ring 40, the exhaust ring 40 is provided with a plurality of exhaust gas distributing holes 41 connected to the atmosphere, so that the plurality of exhaust gas distributing holes 41 can communicate with the exhaust holes 16 to guide the air motor 20 to rotate after being discharged The remaining high-pressure air, and the exhaust ring 40 can also buffer the residual air discharged from the venting hole 16 to prevent the residual gas from directly impacting the operator's hand and causing discomfort.

Further, the air motor 20 is internally provided with a rotor 21, and the rotor 21 is movably disposed with a plurality of blades 22, and the rotor 21 is rotated by the driving of high-pressure air via the blades 22, and one end of the rotor 21 forms a power output shaft 23. The output shaft 23 can extend along the axis line 11 into the head housing 103b. The tool joint 90 is erected in the head housing 103b in such a manner as to be coaxial with the shaft line 11, that is, an angle θ1 is formed between the output shaft 23 of the air motor 20 and the tool joint 90. The angle θ 1 is 90 degrees in implementation, but is not limited thereto. In order to connect the output shaft 23 of the air motor 20 to the tool joint 90, the output shaft 23 of the air motor 20 and the tool joint 90 are respectively coupled to a helical gear (not shown), and the output shaft 23 is The helical gear engages the helical gear of the tool joint 90 such that the output shaft 23 of the air motor 20 can rotate the tool joint 90. The above is the output shaft 23 of the air motor 20 One type of connection with the tool joint 90 can be specifically implemented, but not limited thereto.

As shown in FIG. 3 to FIG. 5, the rotary valve 30 has a hollow shaft pin shape, and can be pivotally placed in the motor housing base 102b so that the rotary valve 30 can be seated on the air motor 20 and Between the air chambers 12 of the casing 10b. In a specific implementation, a sleeve 17 having a hollow shaft pin shape is disposed in the handle housing 101b. The sleeve 17 is located between the rotary valve 30 and the rotating ring 50b. The air chamber 12 is Formed in the sleeve 17, one end of the sleeve 17 is connected to the rotary valve 30, and the other end of the sleeve 17 extends to one end of the handle housing 101b away from the motor housing 102b, the sleeve 17 extending to the handle housing A bolt hole 171 is defined in each of the radial positions of the two sides of the seat 101b away from the end of the motor housing 102b. The two bolt holes 171 can respectively fix a bolt 19 to protrude in the radial direction of the rotary valve 30.

In addition, the handle housing 101b defines a stroke arc hole 18 adjacent to the wall of the air inlet opening 13, and a rotation ring 50b is pivotally disposed on the periphery of the seat wall of the handle housing 101b. A latching groove 51 is formed on the inner wall of the side of the dial ring 50b. The latching rod 19 can protrude into the arcing hole 18 and the latching rod 19 can be engaged in the latching slot 51 of the rotating ring 50b. The utility model is designed so that the operator can rotate the rotating ring 50b by hand to drive the bolt 19 to rotate the rotary valve 30 to rotate forward and reverse; wherein the stroke arc hole 18 can restrain the angle when the bolt 19 is rotated. In turn, the rotary valve 30 can be rotated to a forward output position and a power reverse position.

Further, as shown in FIG. 3, a gas passage 31 is formed along the shaft line 11 inside the rotary valve 30, and the rotary valve 30 is formed at the double end of the shaft line 11 to form an air supply end surface 32 and a Inlet end face 33. The air guiding passage 31 extends through the air inlet end face 33 such that the air guiding passage 31 can communicate with the air chamber 12 via the air inlet end face 33. The air supply end face 32 of the rotary valve 30 is adjacent to the air motor 20; in practice, when no other components are disposed between the rotary valve 30 and the air motor 20 (for example, the guide plate 70 to be described later), the air supply end face 32 can be The motor 20 is in close contact.

The air supply end surface 32 is formed with an air supply port 34 communicating with the air guiding channel 31 and an exhaust port 35 communicating with the air hole 16 of the motor housing base 102b. Further, as shown in FIG. Shown, the air supply port 34 of the rotary valve 30 and the exhaust The port 35 is respectively located at an eccentric position through which the air supply end face 32 extends with respect to the axis line 11; wherein the exhaust port 35 extends from the eccentric position in the direction of the axis line 11 to the axis line in the form of an arc groove The radial direction of 11 is such that it can communicate with the venting opening 16 of the motor housing 102b.

In addition, an elastic member 60 is disposed between the rotary valve 30 and the air chamber 12, and the elastic member 60 applies a thrust to the rotary valve 30 to close the air supply end surface 32 of the rotary valve 30 toward the air motor 20 or even implement For the touch.

In addition to the above configuration, referring to FIG. 3, a wind deflector 70 may be disposed in the motor housing 102b of the housing 10b, and the deflector 70 may be coupled to the air motor 20. The deflector disk 70 is in the shape of a disk and has two corresponding disk faces, such that the disk surface of the deflector disk 70 is respectively located between the air motor 20 and the air supply end face 32 of the rotary valve 30; and, the deflector disk 70 Forming a forward air inlet hole 71 and a reverse air inlet hole 72 respectively communicating with the two corresponding disk surfaces, and the forward rotation air inlet hole 71 and the reverse air inlet hole 72 are respectively located on the guide wire plate 70 with respect to the axis line 11 eccentric position through which the extension passes. In addition, an airtight gasket 80 is provided between the deflector 70 and the air motor 20 for improving the airtightness when the deflector 70 is combined with the air motor 20.

The configuration of the above-described baffle 70 is intended to enable the air motor 20 to be connected to the air supply end face 32 of the rotary valve 30 having a different outer diameter to facilitate the passage of high pressure air from the rotary valve 30 through the deflector 70 into the air motor 20 . However, in the present invention, the deflector 70 is merely an additional member, and is not an essential component that is indispensable for solving the problem.

With reference to FIG. 6 , when the rotary valve 30 is rotated and rotated to the output forward rotation position, the air supply port 34 of the rotary valve 30 can communicate with the air motor 20 via the forward rotation air inlet 71, and The exhaust port 35 of the rotary valve 30 can communicate with the air motor 20 via the reverse air intake hole 72, so that the high-pressure air in the air guide passage 31 of the rotary valve 30 can pass through the air supply port 34 and the forward air intake port 71. The output shaft 23 of the driving air motor outputs positive rotation energy, and the residual gas of high-pressure air generated when the air motor 20 rotates forward can sequentially pass through the exhaust port 35 of the rotary valve 30 via the reverse air inlet 72, and the exhaust ring 40 The exhaust manifold 41 is in turn discharged to the outside atmosphere.

Referring to FIG. 7 , when the rotary valve 30 is rotated to the output reverse position, the air supply port 34 of the rotary valve 30 can communicate with the air motor 20 via the reverse air inlet 72, and the rotary valve 30 The exhaust port 35 can communicate with the air motor via the forward rotation air inlet 71, so that the high-pressure air in the air guiding passage 31 of the rotary valve 30 can drive the air motor through the air supply port 34 and the reverse air inlet 72. The output shaft 23 outputs the reverse rotation energy, and the high-pressure air residual gas generated when the air motor 20 is reversed can sequentially pass through the forward rotation air inlet 71 through the exhaust port 35 of the rotary valve 30 and the exhaust gas flow of the exhaust ring 40. The holes 41 are in turn discharged into the outside atmosphere.

Furthermore, in the example in which the deflector 70 is disposed, the elastic member 60 disposed between the rotary valve 30 and the plenum 12 can push the rotary valve 30 to cause the air supply end surface 32 to contact the diversion flow. The disk surface of the disk 70.

Referring to FIG. 8, a configuration detail of a second embodiment of the present invention is disclosed. The difference from the first embodiment is that the housing 10c can be along a shaft by a handle housing 101c and a head housing 103c. The core wire 11 is serially locked, and the configuration of the handle housing 101c is identical in construction to the configuration of the handle housing 101b in the first embodiment, and will not be described again.

The head housing 103c is integrated to integrate the motor housing 102b and the head housing 103b in the first embodiment. In other words, the air motor 20, the rotary valve 30 and the tool connector 90 are respectively disposed on In the head housing 103c, the rotary valve 30 is disposed in the head housing 103c along the axis line 11, and the output shaft 23 of the air motor 20 is disposed on the head housing 103c so as to be coaxial with the shaft line 11. The angle θ 2 is formed between the output shaft 23 of the air motor 20 and the shaft line 11 , and the angle θ 2 is 90 degrees in practice, but is not limited thereto. The tool joint 90 is disposed in the head housing 103c coaxially with the output shaft 23 of the air motor 20, so that the output shaft 23 of the air motor 20 can be connected in series with the tool joint 90, thereby driving the tool joint 90. Rotate.

The above embodiments are merely illustrative of preferred embodiments of the invention, but are not to be construed as limiting the scope of the invention. Therefore, the present invention should be based on the content of the claims defined in the scope of the patent application.

Claims (15)

A pneumatic circuit switching structure of a pneumatic rotary hand tool comprises: a casing, forming a hollow shell column along a shaft line, the casing has a gas chamber capable of collecting high-pressure air, and one end of the casing is pivoted a tool connector, the other end of the casing is provided with an air inlet connecting the air chamber; a pneumatic motor is fixed in the casing, and is located between the tool joint and the air chamber, and the air motor Having a power output shaft coupled to the tool joint; a rotary valve pivoted along the shaft line in the housing and located between the air motor and the air chamber; and a rotary ring along the axis The wire is adjacently disposed on the wall of the casing shell at the periphery of the air inlet, and the rotating ring can be rotated by a sleeve pivoted in the casing to switch the air motor forward or reverse The sleeve is located between the rotary valve and the rotating ring. The pneumatic circuit switching structure of the pneumatic rotary hand tool according to claim 1, wherein the housing is formed by a pair of a handle housing, a motor housing and a housing along the axis line. The air chamber is formed in the handle housing, the air motor is fixed in the motor housing, and the tool joint is pivotally disposed in the head housing. The air circuit switching structure of the pneumatic rotary hand tool according to claim 2, wherein the air inlet is opened at one end of the handle housing away from the motor housing, and the rotating ring is adjacently disposed at the periphery of the air inlet The handle shell is seated on the wall. The air circuit switching structure of the pneumatic rotary hand tool according to claim 1, wherein the housing is formed by a pair of a handle housing and a housing along the axis line, and the air chamber is formed. The air motor and the tool joint are respectively disposed in the head housing in the handle housing. The air circuit switching structure of the pneumatic rotary hand tool according to claim 4, wherein the air inlet opening is located at one end of the handle housing away from the head housing, and the rotating ring is adjacently disposed at the periphery of the air inlet The handle shell is seated on the wall. The pneumatic circuit switching structure of the pneumatic rotary hand tool of claim 1, 2 or 4, wherein the output shaft of the air motor is coaxially disposed along the axis. The pneumatic circuit switching structure of the pneumatic rotary hand tool according to claim 6, wherein the output shaft of the air motor is coupled to the tool joint to form an angle. The pneumatic circuit switching structure of the pneumatic rotary hand tool according to claim 1, 2 or 4, wherein the output shaft of the air motor is disposed coaxially along the axis. The pneumatic circuit switching structure of the pneumatic rotary hand tool according to claim 8, wherein the output shaft of the air motor and the axial line form an angle. The pneumatic circuit switching structure of the pneumatic rotary hand tool according to claim 9, wherein the output shaft of the air motor is coaxially coupled to the tool joint. The air circuit switching structure of the pneumatic rotary hand tool according to claim 1, wherein the inside of the rotary valve forms an air guiding passage along the axial line, and the rotating valve is formed at a double end of the axial line to form an air supply end surface and An air inlet end face adjacent to the air motor, and the air guiding passage communicates with the air chamber via the air inlet end surface. The pneumatic circuit switching structure of the pneumatic rotary hand tool according to claim 11, wherein the air supply end face is spaced apart to form an air supply port communicating with the air guiding channel and an exhaust port communicating with the atmosphere. The pneumatic circuit switching structure of the pneumatic rotary hand tool according to claim 12, wherein a side of the side wall of the casing forms an exhaust hole communicating with the atmosphere, and the exhaust port communicates with the atmosphere via the exhaust hole. The air circuit switching structure of the pneumatic rotary hand tool according to claim 1, wherein a guide disc is disposed in the housing, the guide disc is located between the air motor and the rotary valve, and the air motor and the rotary valve Connected to each other via the baffle, the baffle has a forward air inlet for guiding the high pressure air to drive the air motor to rotate forward and a reverse air inlet for guiding the high pressure air to drive the air motor to reverse hole. The pneumatic circuit switching structure of the pneumatic rotary hand tool according to claim 14, wherein the rotation An elastic member is disposed between the valve and the air chamber, and the rotary valve is pressed by the elastic member to press against a side surface of the deflector.