Pneumatic tool motor with side cover airflow guide structure

Abstract

The invention relates to a pneumatic tool motor with a side cover airflow guide structure, which is provided with an air cylinder, the air cylinder comprises a containing chamber, the containing chamber is at least provided with two air inlet flow channels, two air outlet flow channels, two air outlets and a rotor, and a plurality of blades are respectively contained in grooves of the rotor. A flow guide side cover is arranged at the front end of the air cylinder, a rear cover is arranged at the rear end of the air cylinder, an air storage groove is formed in the position, in butt joint with the exhaust flow channel, of the front air inlet guide groove and the rear air inlet guide groove, and a deep air storage part is formed in the position, in butt joint with the exhaust flow channel, of the air storage groove. A shallow air guide part is arranged at the position, connected with the front air inlet guide groove, of the connecting side, an air storage groove is formed in the front exhaust guide groove and the rear exhaust guide groove which are the same, the air storage groove is provided with a deep air storage part, and a shallow air guide part is arranged at the position, connected with the front exhaust guide groove, of the connecting side. The two rear air inlet guide grooves formed in the rear cover are also provided with the air storage groove, the air storage part with the deeper depth and the air guide part with the shallower depth.

Description

Technical Field

[0001] The pneumatic tool motor with a side cover airflow guide structure of the present invention is an air guide structure of an air tool motor cylinder, and particularly relates to an air guide structure on a side cover of an air tool motor cylinder, which reduces the wear of the rotor blades during operation and increases the airtightness effect by adding an air storage groove. Background Art

[0002] A pneumatic tool motor is a motor that introduces high-pressure gas into the pneumatic tool body, then guides the high-pressure gas through the air guide holes to drive the blades of the blade rotor in the pneumatic tool body to generate power and then rotate, which is then transmitted to the driving end of the pneumatic tool to achieve the working effect of the driving tool. In the continuous evolution of such products, designers often design the maximum blade rotor driving power under certain air pressure introduction conditions. In other words, the introduced high-pressure air is passed through better air supply conditions so that the active blades of the blade rotor can withstand the maximum air pressure to increase the output power of the blade rotor. This has long been the focus of pneumatic tool motor design, and historically, the design context of how pneumatic tool motors can improve the output power of the blade rotor by improving the air intake can also be analyzed through the patent application context.

[0003] As mentioned above, after the high-pressure gas is introduced into the pneumatic tool body, the high-pressure controller is injected into the cylinder chamber where the blade rotor is installed through the air guide hole. However, if the air guide hole directly injects the high-pressure air into the cylinder chamber to drive the active blades of the blade rotor to rotate at high speed and high torque without changing the air outlet diameter of the air guide hole, in order to achieve this purpose, the inventor has opened an auxiliary port 48 (secondary port) with a volume expansion groove shape on the periphery of the air guide hole 52 (through-ports) in the invention patent No. US2,424,638 ('638) filed in the United States on November 8, 1944. The '638 patent specification clearly discloses that after the airflow flows out from the auxiliary port 48 through the air guide hole 52 and is introduced into the pneumatic tool body, the high-pressure air is injected into the cylinder chamber where the blade rotor is installed through the air guide hole 52 to push the blade rotor. Although the '638 patent specification does not clearly teach the function of the auxiliary port 48, those familiar with the technology can easily understand that its design purpose is to allow air to be injected into the space of the auxiliary port 48 at a larger flow rate to generate a larger air pressure.

[0004] On October 24, 1967, the invention patent No. US3,472,323 ('323) was filed in the United States. Figure 5 and Figure 6Once again, the '323 patent also mentions that after the gas flows out from the exhaust passage 121 (exhaust passage) through the port 118 (port) of the outer expanded groove space of the exhaust passage 121 and is introduced into the pneumatic tool body, the high-pressure air is injected into the cylinder chamber 54 (exhaust chamber) where the vane rotor is installed through the exhaust passage 121 to push the vane rotor 50 (rotor). It can be seen that the outward expansion of the air groove on the edge of the vent hole of the pneumatic tool cylinder body is a long-known design for increasing air pressure.

[0005] In addition, in the patent specification diagram of the invention patent number SE515533C2 ('533) applied for in Sweden on April 1, 1998 Figure 2 There are four air inlets in both directions: 32 / 33 / 35 / 36 ( inloppsportar). Figure 2 The four air intake holes 32 / 33 / 35 / 36 also have outward-expanding air grooves on their edges to increase the air intake volume, and it is more obvious that they have a two-way switching mode for four air intake holes.

[0006] FIG. 9 of the invention patent No. US 6,250,399 B1 ('399) filed in the United States on September 13, 1999 discloses four first and second air inlet ports 35 / 37 / 36 / 38 (first ports / second ports) in both directions, and FIG. 11 discloses a side cover having a pair of inner housing slots 31 / 32 / 33 / 34 (inner housing The specification also states that when pressurized air is directed through the body openings 31 and / or 33, the first port 35 / 37 of the cylinder is connected to the blade rotor in the first direction alone or in combination. Similarly, when pressurized air is directed through the body openings 32 and / or 34, the second port 36 / 38 is connected to the blade rotor in the second direction alone or in combination. When the two ports receive compressed air, the pneumatic tool is in a high-speed state. That is, the '399 patent preferentially combines the four bidirectional air ports with the body openings of the side cover, and connects the corresponding air inlet ports to the blade rotor through the body openings, thereby generating a higher-speed thrust. Unlike the previous patent, the air inlet port of the '399 patent does not have an obvious guide groove space expanded from the air inlet hole, and this difference is only a means of combining the prior art.

[0007] In the patent specification of invention patent application No. US 2004 / 0197218 A1 ('218) filed in the United States on March 8, 2004, a design is further disclosed in which the cylinder body of a pneumatic tool is provided with two air vents and an outward-expanding air groove is provided at the edge of each of the two air vents. In the invention, the air vents can be switched through other structures to form an air inlet 11 (air inlet) and an air outlet 12 (air outlet) and can be switched at any time. From the various figures in the specification of the '218 application, it can be seen that the edges of the air inlet 11 and the air outlet 12 are provided with outward-expanding grooves to increase the air intake. The '218 application can be regarded as a derivative application design of the prior art.

[0008] Please refer to Figure 1The patent diagram of Taiwan Patent No. M541520 ('520, the same case application EP3351723B1) of China, the '520 patent discloses a cylinder 2 including a cylinder body 20, and a chamber 22 located in the cylinder body 20, the cylinder body 20 is provided with two intake passages 24, two exhaust passages 26, four exhaust holes 28 and a front axle hole 29 connecting the chamber 22 with the outside, the cylinder body 20 includes a middle pipe 40, a front cover 50 provided at the front end 40a of the middle pipe 40, and a rear cover 60 provided at the rear end 40b of the middle pipe 40, the front axle hole 29 is provided on the front cover 50, the four exhaust holes 28 are respectively provided on the upper and lower sides of the middle pipe 40, and a rear cover 60 has two intake ports 62 are 180° apart, two exhaust ports 64 are 180° apart, two rear intake guide grooves 66 are provided on the front wall of the rear cover 60 and are respectively connected to the two intake ports 62, two rear exhaust guide grooves 68 are provided on the front wall of the rear cover 60 and are respectively connected to the two exhaust ports 64, and a rear axle hole 69, the rear end 40b of the middle pipe 40 has two rear intake grooves 42 corresponding to the two intake ports 62 and connected to the accommodation chamber 22, and two rear exhaust grooves 44 corresponding to the two exhaust ports 64 and connected to the accommodation chamber 22, the middle pipe 40 further has two intake flow channels 41 penetrating the middle pipe 40 along an axial direction X of the cylinder body 20 and respectively connecting the two rear intake grooves 42, two exhaust flow channels 43 penetrating the middle pipe 40 along the axial direction X and respectively connecting The two rear exhaust grooves 44, the two front exhaust grooves 46 are arranged at the front end 40a of the middle pipe 40 and are respectively connected to the two intake flow passages 41, and the two front exhaust grooves 48 are arranged at the front end 40a of the middle pipe 40 and are respectively connected to the two exhaust flow passages 43. The two front exhaust grooves 46 and the two front exhaust grooves 48 are both connected to the chamber 22. The front cover 50 has two front exhaust guide grooves 56 arranged on the rear wall of the front cover 50 and connected to the intake flow passage 41, and two front exhaust guide grooves 58 are arranged on the rear wall of the front cover 50 and connected to the exhaust flow passage 43. Each of the intake passages 24 is composed of an air inlet 62, a rear air inlet guide groove 66, a rear air inlet groove 42, an intake flow passage 41, a front air inlet groove 46, and a and a front air intake guide groove 56, and each exhaust passage 26 is composed of an exhaust port 64, a rear exhaust guide groove 68, a rear exhaust groove 44, an exhaust flow passage 43, a front exhaust groove 48, and a front exhaust guide groove 58; after the gas first passes through the two air intake ports 62, a part of the gas flows into the chamber 22 through the two rear air intake grooves 42, a part of the gas enters the two rear air intake guide grooves 66 and then flows into the chamber 22, and the remaining part of the gas enters the two air intake flow passages 41; after the gas passes through the two air intake flow passages 41, a part of the gas flows into the chamber 22 through the two front air intake grooves 46, and the remaining part of the gas enters the two front air intake guide grooves 56 and then flows into the chamber 22;After the gas enters the chamber 22, it blows the multiple blades 34, so that the multiple blades 34 can move outward from the multiple grooves 32 and stick to the inner wall of the chamber 22. At this time, the gas flowing in another direction pushes the multiple protruding blades 34, thereby driving the rotor 3 to rotate in the chamber 22. The detailed process of the gas leaving the chamber 22 through the two exhaust passages 26 is as follows: first, part of the gas passes through the multiple exhaust holes 28 for the first exhaust, then part of the gas directly enters the rear exhaust groove 44 and is discharged from the exhaust port 64, part of the gas enters the rear exhaust guide groove 68 and is discharged from the exhaust port 64, and the other part of the gas enters the exhaust flow channel 43 through the front exhaust groove 48 and the front exhaust guide groove 58 and is discharged from the exhaust port 64, thereby completing the second exhaust. ;

[0009] However, the design of the '520 new patent product has the following disadvantages: when the rotor 3 rotates at high speed and high torque in the chamber 22, the multiple blades 34 can move outward from the multiple grooves 32 and come into rapid and high-pressure contact with the inner wall of the chamber 22. At this time, these pushed-out blades 34 will inevitably pass through the gaps formed by the rear air intake grooves 42 and the exhaust grooves 44 on the inner wall of the chamber 22. After a long period of operation, the gaps formed on the inner wall of the chamber 22 will inevitably cause a certain degree of stress to wear the corner positions of the top edges of the multiple blades 34. The output of the rotor 3 is based on the airtightness generated by the multiple blades 34 when they rotate and the inner wall of the chamber 22. The higher the airtightness, the better the efficiency of the gas pressure push. Once the airtightness is reduced, the speed and torque of the rotor will be significantly reduced, resulting in a shortened product life. Summary of the invention

[0010] The present invention is an air tool motor with a side cover air flow guide structure, comprising a cylinder comprising a chamber, the chamber having at least two intake flow passages, two exhaust flow passages, two exhaust holes, and a rotor, the rotor having a plurality of grooves, a plurality of blades respectively accommodated in each groove, a guide side cover arranged at the front end of the cylinder, and a rear cover arranged at the rear end of the cylinder, the two exhaust holes arranged in the cylinder, the rear cover having two intake ports, two exhaust ports, two rear intake guide grooves arranged on the front wall of the rear cover and respectively connected to the two intake passages, and two rear exhaust guide grooves arranged on the front wall of the rear cover and respectively connected to the two exhaust passages, the guide side cover having two front intake guide grooves arranged on the rear wall of the front cover and connected to the intake flow passage, and two front exhaust guide grooves arranged on the rear wall of the front cover and connected to the exhaust flow passage, and the main feature is that: the front intake guide groove and the rear intake guide groove are provided with an air storage groove at the position where they are connected to the exhaust flow passage, wherein the air storage groove The air groove is provided with a deeper air storage portion at the position where it connects to the exhaust flow channel, and a shallower air guide portion is provided at the position where it connects to the front air intake guide groove on the connecting side. Similarly, the front exhaust guide groove and the rear exhaust guide groove are provided with an air storage groove at the position where they connect to the intake flow channel, and the air storage groove is provided with a deeper air storage portion at the position where it connects to the intake flow channel, and a shallower air guide portion is provided at the position where it connects to the front exhaust guide groove on the connecting side. An exhaust port is provided at the position where the rear cover connects to the exhaust flow channel, and the exhaust port is provided with a deeper air storage portion at the position where it connects to the exhaust flow channel, and a shallower air guide portion is provided at the position where the front air intake guide groove is connected on the connecting side. An air inlet is provided at the position where the rear air intake guide groove is connected to the intake flow channel, and the air inlet is provided with a deeper air storage portion at the position where it connects to the intake flow channel, and a shallower air guide portion is provided at the position where the front exhaust guide groove is connected on the connecting side.

[0011] The secondary feature of the present invention is that the area of ​​the air storage groove is larger than the intake air passage, and the air storage portion is located within the area of ​​the air guide portion. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 : Taiwan's new patent number M541520 Figure 2 Exploded view;

[0013] Figure 2 : is a partial exploded view of a pneumatic tool motor according to a preferred embodiment of the present invention;

[0014] Figure 3 : is a partial assembly diagram of a pneumatic tool motor according to a preferred embodiment of the present invention;

[0015] Figure 4 : is a three-dimensional view of the air guide side cover of the pneumatic tool motor according to the preferred embodiment of the present invention;

[0016] Figure 5: is a plan view of the air guide side cover of the pneumatic tool motor according to the preferred embodiment of the present invention;

[0017] Figure 6 : is a partial assembly diagram of the motor of the pneumatic tool from another perspective of the preferred embodiment of the present invention;

[0018] Figure 7 : is a plan view of the rear cover of the pneumatic tool motor according to a preferred embodiment of the present invention.

[0019] Description of reference numerals:

[0020] 1: Double air intake pneumatic motor

[0021] 10: Side cover

[0022] 12 / 14: Gas Tank

[0023] 121 / 141: Air storage unit

[0024] 122 / 142: Air guide

[0025] 16: Front air intake guide

[0026] 18: Front exhaust guide groove

[0027] 2: Cylinder

[0028] 22: Chamber

[0029] 28: Exhaust hole

[0030] 29: Front axle hole

[0031] 3: Rotor

[0032] 30: Turn

[0033] 32: Groove

[0034] 34: Blade

[0035] 36: Front spindle

[0036] 38: Rear spindle

[0037] 40: Middle pipe

[0038] 40a: Front End

[0039] 40b: Backend

[0040] 41: Intake air duct

[0041] 42: Rear air intake groove

[0042] 43: Exhaust runner

[0043] 44: Rear exhaust groove

[0044] 50: Front cover

[0045] 56: Front air intake guide

[0046] 58: Front exhaust guide

[0047] 60: Back cover

[0048] 62: Air Inlet

[0049] 621 / 641: Gas storage unit

[0050] 622 / 642: Air guide

[0051] 64: Exhaust port

[0052] 66: Rear air intake guide

[0053] 68: Rear exhaust guide

[0054] X: Axial DETAILED DESCRIPTION

[0055] See also Figure 2 A partial exploded view of a pneumatic tool motor according to a preferred embodiment of the present invention is shown; Figure 3 The partial assembly diagram of the pneumatic tool motor of the preferred embodiment of the present invention is shown as well as Figure 6 The motor partial assembly diagram of the pneumatic tool of the preferred embodiment of the present invention from another perspective is shown. In order to solve the problem that the blades 34 pushed out of the cylinder body of the pneumatic tool in the prior art rotate at high speed through the gap formed by the rear air intake groove 42 and the exhaust groove 44 on the inner wall of the chamber 22, resulting in long-term operation and causing wear of the corners of the top edges of the multiple blades 34, which easily leads to poor air tightness, the structural design of the present invention is the same as the prior art and also has a cylinder 2 with a chamber 22, four exhaust holes 28 and a middle pipe 40, an air guide side cover 10 arranged at the front end of the middle pipe 40, and a rear cover 60 arranged at the rear end of the middle pipe 40, and the four exhaust holes 28 are respectively The rear cover 60 is respectively arranged on the upper and lower sides of the middle pipe 40, the rear cover 60 has two air inlets 62 separated by two exhaust ports 64 separated by two rear air inlet guide grooves 66 identical to the air guide side cover 10, which are arranged on the front wall of the rear cover 60 and are respectively connected to the two air inlets 62, and two rear exhaust guide grooves 68 identical to the air guide side cover 10 are arranged on the front wall of the rear cover 60 and are respectively connected to the two exhaust ports 64. The rear end of the middle pipe 40 is connected to the chamber 22, and the middle pipe 40 further has two intake flow channels 41 penetrating the middle pipe 40 along the axial direction X of the cylinder body 20 and are respectively connected to the two exhaust ports 64, and two exhaust flow channels 43 penetrating the middle pipe 40 along the axial direction X and are respectively connected to the two air inlets 62.

[0056] See also Figure 4 The three-dimensional view of the air guide side cover of the pneumatic tool motor of the preferred embodiment of the present invention is shown in FIG. Figure 5The plan view of the air guide side cover of the pneumatic tool motor of the preferred embodiment of the present invention is shown as well as Figure 7 The present invention is shown in the plan view of the rear cover of the pneumatic tool motor of the preferred embodiment of the present invention. The important feature of the present invention is that it has an air guide side cover 10, which has two front air intake guide grooves 16 arranged on a side wall of the air guide side cover 10 and connected to the air intake flow channel 41, and two front exhaust guide grooves 18 arranged on a side wall of the air guide side cover 10 and connected to the exhaust flow channel 43. The air intake channel is composed of the air intake port 62, the rear air intake guide groove 66, the air intake flow channel 41 and the front air intake guide groove 16, and each exhaust channel is composed of the exhaust port 64, the rear exhaust guide groove 68, the exhaust flow channel 43, and the exhaust port 64. The front exhaust guide groove 18 is composed of a gas storage groove 12 at the position where the front exhaust guide groove 16 connects to the exhaust flow channel 43, wherein the gas storage groove 12 covers the exhaust flow channel 43, and the gas storage groove 12 is provided with a deep gas storage portion 121 at the position where the exhaust flow channel 43 is connected, and a shallow gas guide portion 122 is provided at the position where the front exhaust guide groove 16 is connected. Similarly, the front exhaust guide groove 18 is provided with an gas storage groove 14 at the position where the intake flow channel 41 is connected, wherein the gas storage groove 14 has a surface The area of ​​the exhaust port 64 covers the exhaust flow channel 43, and the exhaust port 64 has a deep air storage portion 641 at the position where the exhaust flow channel 43 is connected, and a shallow air guide portion 142 is opened at the position where the front exhaust guide groove 18 is connected on one side. The exhaust port 64 has an area covering the exhaust flow channel 43, and the exhaust port 64 has a deep air storage portion 641 at the position where the exhaust flow channel 43 is connected, and a shallow air guide portion 142 is opened at the position where the front exhaust guide groove 68 is connected on one side. 642, and then an air inlet 62 is opened at the position where the rear air intake guide groove 66 is connected to the intake flow channel 41 on one side of the connection, wherein the air inlet 62 area covers the exhaust flow channel 41, and the air inlet 62 is opened at the position where the intake flow channel 41 is connected with a deeper air storage portion 621, and then a shallower air guide portion 622 is opened at the position where the front exhaust guide groove 66 is connected to the connection side; in the preferred embodiment of the present invention, the opening position of the air guide portion 122 / 142 / 622 / 642 is within the opening area of ​​the air storage portion 121 / 141 / 621 / 641.

[0057] The rotor 3 is rotatably accommodated in the chamber 22 of the cylinder 2 and has a plurality of grooves 32, and a plurality of corresponding blades 34 are respectively accommodated in each groove 32. A front spindle 36 extends forward and passes through, and a rear spindle 38 extends backward and passes through the cylinder 2 to abut against the front cover 50 and the rear cover 60.

[0058] Through the design of the air storage groove 12 provided on the aforementioned air guide side cover 10 and the rear cover 60, gas can enter the air storage groove 12 and inject high-pressure airflow into the chamber 22 through the air storage portion 121 to drive the multiple blades 34 of the rotor 3 to generate thrust for operation, and a portion of gas can be injected into the middle part of the chamber 22 through the air guide portion 122 to drive the blades 34 to generate back pressure and accelerate them to press against the inner wall of the chamber 22 to increase the air tightness.

[0059] Since the air guide side cover 10 and the rear cover 60 are designed with the air storage groove 12, there will be no opening contact between the chamber 22 and the blades 34, avoiding the ups and downs after the processing of the opening to increase the loss of the chamber 22 and the multiple blades 34 due to rotation, and maintaining better air tightness, which has better technical effects on durability and efficiency.

Claims

1. A pneumatic tool motor with a side cover airflow guide structure, comprising a cylinder comprising a chamber, the chamber having at least two intake flow passages, two exhaust flow passages, two exhaust holes, and a rotor, the rotor having a plurality of grooves, a plurality of blades respectively accommodated in each groove, a guide side cover arranged at the front end of the cylinder, and a rear cover arranged at the rear end of the cylinder, the two exhaust holes arranged in the cylinder, the rear cover having two intake ports, two exhaust ports, two rear intake guide grooves arranged on the front wall of the rear cover and respectively connected to the two intake passages, and two rear exhaust guide grooves arranged on the front wall of the rear cover and respectively connected to the two exhaust passages, the guide side cover having two front intake guide grooves arranged on the rear wall of the front cover and connected to the intake flow passages, and two front exhaust guide grooves arranged on the rear wall of the front cover and connected to the exhaust flow passages, characterized in that: The front air intake guide groove and the rear air intake guide groove are provided with an air storage groove at the position where they are connected to the exhaust flow channel, wherein the air storage groove is provided with a deeper air storage portion at the position where it is connected to the exhaust flow channel, and then a shallower air guide portion is provided at the position where the air storage portion is connected to the front air intake guide groove. The front exhaust guide groove and the rear exhaust guide groove are provided with an air storage groove at the position where they are connected to the intake flow channel, and the air storage groove is provided with a deeper air storage portion at the position where it is connected to the intake flow channel, and then a shallower air guide portion is provided at the position where the air storage portion is connected to the front exhaust guide groove. An air guide portion with a relatively shallow depth is provided, and an exhaust port is provided at the position where the rear cover is connected to the exhaust flow channel. The exhaust port is provided with an air storage portion with a relatively deep depth at the position where it is connected to the exhaust flow channel, and then an air guide portion with a relatively shallow depth is provided at the position where the front air intake guide groove is connected to the connection side, and then an air intake port is provided at the position where the rear air intake guide groove is connected to the intake flow channel, and the air storage portion with a relatively deep depth is provided at the position where the air intake port is connected to the intake flow channel, and then a air guide portion with a relatively shallow depth is provided at the connection side where the front exhaust guide groove is connected.

2. The pneumatic tool motor with a side cover airflow guide structure as claimed in claim 1, wherein: The air storage tank has a large area and an inlet flow passage.

3. The pneumatic tool motor with a side cover airflow guide structure as claimed in claim 1, wherein: The air guide portion is opened at a position within the air storage portion.

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