CN216381513U - Air Motors for Hand Tools - Google Patents

Abstract

A pneumatic motor for hand tool machine is composed of a working axle, a rotor for driving said working axle, and a cylinder body. The cylinder body comprises a hollow tube and two end plates which are respectively arranged at two ends of the hollow tube, the hollow tube is provided with a space for arranging the rotor, a ceramic wear-resistant layer, an air inlet channel communicated with the space and at least one exhaust opening communicated with the space, and the height of the space is greater than that of the rotor. The air inlet channel is provided with an air inlet port and two air inlet ports communicated with the air inlet port, and each of the two end plates is provided with an air guide groove facing the space. When the air inlet channel receives high-pressure air, the two air inlet ports and the two air guide grooves make the rotor not contact with any of the two end plates except the rotation.

Description

Air Motors for Hand Tools

technical field

The utility model relates to a pneumatic motor for a hand tool machine, in particular to a pneumatic motor which can reduce work wear and prolong the service life.

Background technique

The pneumatic power tool drives a work piece to rotate by pushing a rotor in an air motor through a high-pressure gas. The rotor of the existing air motor has a body, a plurality of guide grooves formed on the body, and a plurality of blades respectively disposed in the guide grooves. When the rotor rotates, the vanes move in the guide grooves and contact an inner wall of a cylinder in sequence. When the vanes contact the inner wall of the cylinder, they will slide on the inner wall surface of the cylinder for a period of time due to the continuous rotation of the main body. Over time, the vane and the inner wall of the cylinder will be worn in the long run. Once the wear is obvious, it will affect the operation of the air motor.

Utility model content

The main purpose of the utility model is to reduce the working wear and tear of the air motor.

In order to achieve the above purpose, the present invention provides an air motor for a hand tool, the air motor includes a working shaft, a rotor, and a cylinder. The working shaft has a driving piece, the rotor has a mounting hole for the working shaft to pass through, and a slot that communicates with the mounting hole and provides the driving piece to be disposed therein. The cutting groove allows the driving piece to generate axial movement , so that the rotor can produce axial displacement relative to the working shaft, when the rotor rotates, the driving piece will be driven by the notch, so that the working shaft will rotate radially. The cylinder includes a hollow tube and two end plates respectively disposed at two ends of the hollow tube. The hollow tube has a space for the rotor to be installed, and a ceramic wear-resistant layer disposed in the hollow tube and surrounding the space. , an air inlet channel that communicates with the space and an exhaust opening that communicates with the space, the height of the space is greater than the height of the rotor, the air inlet channel has an air inlet port and is connected to the air inlet port and is located at two sides of the hollow tube respectively The end is connected to two air inlet ports of the space, the two end plates are respectively arranged at both ends of the hollow tube, and each of the two end plates has an air guide groove facing the space. Wherein, when the air inlet channel receives a high pressure gas, the two air inlet ports and the two air guide grooves will make the rotor not contact with either of the two end plates except for rotation.

In one embodiment, the arithmetic mean deviation of the contour of the ceramic wear-resistant surface on one side of the space is 0.04um, and the maximum height of the contour is 0.4um.

In one embodiment, the thickness of the ceramic wear-resistant layer is 0.03 mm.

In one embodiment, the height difference between the space in the hollow tube and the rotor is greater than or equal to 0.02 mm.

In one embodiment, the hollow tube has two flow-guiding notches located at two ends respectively and respectively communicating with one of the two air inlet ports.

In one embodiment, each of the two end plates respectively has a through hole for the working shaft to pass through, and a set of bearings connected to the working shaft.

In one embodiment, each of the air guide grooves respectively has a straight line segment extending from one edge of the two end plates toward the via hole, and an arc line segment connecting the straight line segment and close to the via hole .

In one embodiment, an eccentric retaining block is provided on the working shaft.

In one embodiment, the hollow tube is formed with a first positioning hole, the two end plates are respectively formed with a second positioning hole corresponding to the first positioning hole, and the first positioning hole and the second positioning hole provide a The positioning pieces are set therein.

In one embodiment, the two end plates respectively have a wall for positioning one of the two bearings, and each of the two through holes is respectively located within a range surrounded by one of the two walls.

In one embodiment, the air motor has a pair of bearing rings disposed on one of the two end plates, the bearing ring has a ring groove on one side facing the two end plates, and the ring groove provides an airtight ring set it.

Through the aforementioned implementation of the present invention, compared with the conventional one, the present invention has the following characteristics: the present invention penetrates the ceramic wear-resistant layer disposed on the inner wall of the hollow tube, and the rotor does not contact either of the two end plates when rotating, To reduce the working wear of the air motor and prolong the service life of the air motor.

Description of drawings

Fig. 1 is the implementation schematic diagram that the air motor of the utility model is installed in the hand tool;

Fig. 2 is the structural exploded view of the air motor of the utility model;

3 is an exploded view of the other direction of the structure of the pneumatic motor of the utility model;

4 is an exploded view of the structure of the air motor of the present utility model;

5 is a schematic view of the air intake structure of the air motor of the present invention;

FIG. 6 is an enlarged schematic diagram of a partial structure of the air motor structure of the present utility model when the air is taken in. FIG.

【Symbol Description】

20: Air Motor

21: Work axis

211: Drive film

212: Eccentric retaining block

22: Rotor

221: Ontology

222: Guide groove

223: Blade

224: Mounting holes

225: Trough

23: Cylinder block

24: Hollow tube

241: Space

242: Ceramic wear layer

243: Air inlet channel

244: Exhaust opening

245: Inlet port

246: Intake port

247: Diversion gap

248: The first positioning hole

25: End plate

251: Air guide groove

252: Via

253: Bearings

254: Wall

255: Line segment

256: Arc segment

257: Second positioning hole

26: Bearing ring

261: Ring groove

27: Air tight ring

28: Positioning pieces

30: Hand Tool Machine

31: Workpieces

40: Height difference

Detailed ways

The detailed description and technical content of the present utility model are now described as follows in conjunction with the accompanying drawings:

Please refer to FIG. 1 to FIG. 5 , the present invention provides an air motor 20 for a hand tool machine, the air motor 20 is used as the main driver for the work of the hand tool machine 30, the air motor 20 includes a working shaft 21, A rotor 22 for driving the working shaft 21 to rotate, and a cylinder block 23 for providing the rotor 22 therein. Wherein, the working shaft 21 has a driving piece 211, and an eccentric holding block 212 can be provided on the working shaft 21. The eccentric holding block 212 serves as the connection between the working shaft 21 and a working piece 31, which is called the working piece 31 Can be a grinding disc. In addition, the rotor 22 has a body 221 , a plurality of guide grooves 222 formed on the body 221 , a plurality of blades 223 respectively disposed in the guide grooves 222 , and a plurality of blades 223 formed on the body 221 to provide the working shaft 21 The mounting hole 224 is penetrated therethrough, and a groove 225 is connected to the mounting hole 224 and provides the driving piece 211 therein. The length of the slit 225 is much larger than the length of the driving piece 211 , and does not restrict the movement of the driving piece 211 , but allows the driving piece 211 to move axially in the slit 225 . From another perspective, the aforementioned structure enables the rotor 22 to be axially displaced relative to the working shaft 21 . On the other hand, when the rotor 22 rotates, the driving piece 211 is driven by the slit 225 , so that the working shaft 21 rotates radially along with the rotor 22 .

Please refer to FIG. 2 to FIG. 5 , the cylinder body 23 includes a hollow tube 24 and two end plates 25 respectively disposed at two ends of the hollow tube 24 . The hollow tube 24 has a space 241 for providing the rotor 22, a ceramic wear-resistant layer 242 disposed in the hollow tube 24 and surrounding the space 241, an air inlet channel 243 communicating with the space 241, and at least An exhaust opening 244 communicates with the space 241 . Among them, the ceramic wear-resistant layer 242 of the present invention can be provided on the inner wall of the hollow tube 24 by electroplating. The ceramic wear-resistant layer 242 has the advantages of high hardness, low friction coefficient, wear resistance and high temperature resistance. The present invention reduces the wear of the blades 223 and the inner wall of the hollow tube 24 through the ceramic wear-resistant layer 242 . For example, when the free rotation speed of the air motor 20 is 12000RPM, the wear rate of the blade width of the conventional air motor implemented with an aluminum alloy cylinder is 0.00192mm/hr, while the wear rate of the blade width of the air motor 20 of the present invention is 0.00055mm /hr, the visible wear rate decreased significantly. In addition, the excellent thermal conductivity of the ceramic wear-resistant layer 242 can also assist the overall heat dissipation of the air motor 20 . In one embodiment, the arithmetic mean deviation (Ra) of the contour of the surface of the ceramic wear-resistant layer 224 facing the space 241 is 0.04um, and the maximum height (Rz) of the contour is 0.4um. In one embodiment, the thickness of the ceramic wear-resistant layer 224 is 0.03 mm.

5 and 6 , the height of the space 241 of the hollow tube 24 of the present invention is greater than the height of the rotor 22 , as shown by the reference numeral 40 in FIG. 6 , in one embodiment, the space in the hollow tube 24 The height difference between 241 and the rotor 22 is greater than or equal to 0.02 mm. In addition, the air inlet passage 243 has an air inlet port 245 and two air inlet ports 246 connected to the air inlet port 245 and located at both ends of the hollow tube 24 to communicate with the space 241 . On the other hand, the two end plates 25 are respectively disposed at both ends of the hollow tube 24 to close the space 241 , so that the cylinder 23 forms a sequence passing through the air inlet channel 243 , the space 241 and the exhaust opening. 244 gas path. In addition, each of the two end plates 25 has an air guide groove 251 facing the space 241 .

Referring back to FIG. 5 , when the air motor 20 of the present invention operates, the air inlet channel 243 receives a high-pressure gas, and the high-pressure gas will flow through the aforementioned air path, wherein the two air inlet ports 246 and the two air guide grooves 251 will make the high-pressure gas enter into the space 241 from both sides of the rotor 22 at the same time. At this time, because the rotor 22 can move axially relative to the working shaft 21, the rotor 22 is affected by the high-pressure gas approaching from both sides at the same time. A slight suspension occurs without contacting either of the two end plates 25 . In this way, the rotor 22 will not be worn with the two end plates 25 during the rotation.

Please refer to FIG. 2 and FIG. 3 again. In one embodiment, the hollow tube 24 has two guide notches 247 located at two ends respectively and communicated with one of the two inlet ports 246 respectively. It should be understood that the extending direction of the guide notch 247 is determined based on the flow direction of the high pressure gas in the space 241.

Referring back to FIGS. 2 to 4 , in one embodiment, each of the two end plates 25 respectively has a through hole 252 for the working shaft 21 to pass through, and a set of bearings 253 connected to the working shaft 21 . The bearing 253 will stabilize the rotation of the working shaft 21 . Further, the two end plates 25 respectively have a wall 254 for positioning the bearing 253 , and each of the two through holes 252 is respectively located within a range surrounded by one of the two walls 254 . On the other hand, the two air guide grooves 251 have the same shape, and each of the two air guide grooves 251 respectively has a straight line segment 255 extending from one edge of the two end plates 25 to the direction of the via hole 252 , and An arc line segment 256 connecting the straight line segment 255 and close to the via hole 252 . Furthermore, the air motor 20 also has a pair of bearing rings 26 disposed on one of the two end plates 25 . The bearing ring 26 has a ring groove 261 on one side facing the two end plates 25 . Groove 261 provides a hermetic ring 27 disposed therein.

Please refer to FIG. 2 to FIG. 4 again. In order to accurately align and assemble the components of the cylinder block 23, in one embodiment, the hollow tube 24 is formed with a first positioning hole 248, and the two end plates 25 are respectively formed with a A second positioning hole 257 corresponding to the first positioning hole 248, the first positioning hole 248 and the two second positioning holes 257 provide a positioning member 28 disposed therein.

Claims (12)

1. An air motor for a hand tool machine, comprising:

a working shaft having a driving plate;

the rotor is provided with a mounting hole for the working shaft to penetrate through and a groove which is communicated with the mounting hole and is provided with the driving piece, the groove allows the driving piece to move axially, so that the rotor can move axially relative to the working shaft, and when the rotor rotates, the groove drives the driving piece to rotate radially; and

the cylinder body comprises a hollow tube and two end plates which are respectively arranged at two ends of the hollow tube, the hollow tube is provided with a space for arranging the rotor, a ceramic wear-resistant layer which is arranged in the hollow tube and surrounds the space, an air inlet channel which is communicated with the space and an exhaust opening which is communicated with the space, the height of the space is greater than that of the rotor, the air inlet channel is provided with an air inlet port and two air inlet ports which are communicated with the air inlet port and are respectively positioned at two ends of the hollow tube to be communicated with the space, the two end plates are respectively arranged at two ends of the hollow tube, and each of the two end plates is provided with an air guide groove facing the space;

when the air inlet channel receives high-pressure air, the two air inlet ports and the two air guide grooves enable the rotor not to contact any end plate except the rotating rotor.

2. The pneumatic motor for hand tools of claim 1, wherein the ceramic wear layer has an arithmetic mean deviation of the profile of the surface facing the space of 0.04um and a maximum profile height of 0.4 um.

3. A pneumatic motor for hand tools according to claim 2, wherein the ceramic wear layer has a thickness of 0.03 mm.

4. A pneumatic motor for hand tools according to any one of claims 1 to 3, wherein the height difference between the space in the hollow tube and the rotor is greater than or equal to 0.02 mm.

5. A pneumatic motor for hand tools according to any one of claims 1 to 3, wherein the hollow tube has two flow guide notches at two ends respectively communicating with one of the two air inlet ports.

6. A pneumatic motor for a hand tool according to any one of claims 1 to 3 wherein the end plates each have a through hole for the working shaft to pass through and a bearing for engaging the working shaft.

7. The pneumatic motor for a hand tool of claim 6, wherein each air-guiding slot has a straight line segment extending from one of the edges of the two end plates toward the via hole, and an arc segment connecting the straight line segment and adjacent to the via hole.

8. The pneumatic motor for hand tools according to claim 7, wherein the working shaft is provided with an eccentric holding block.

9. The pneumatic motor for hand tools of claim 8, wherein the hollow tube is formed with a first positioning hole, the end plates are respectively formed with a second positioning hole capable of corresponding to the first positioning hole, and the first positioning hole and the second positioning hole provide a positioning member disposed therein.

10. The pneumatic motor for hand tools of claim 9, wherein the end plates each have a wall for locating the bearing, and each of the two through holes is located within a range surrounded by one of the two walls.

11. The pneumatic motor for hand tools of claim 10, wherein the pneumatic motor has a bearing ring disposed in relation to one of the end plates, the bearing ring having a groove disposed on a side thereof facing the end plate, the groove providing a sealing ring disposed therein.

12. The pneumatic motor for hand tools of claim 11, wherein the difference in height between the space in the hollow tube and the rotor is greater than or equal to 0.02 mm.

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