JP2008522847A - High torque dual chamber turbine rotor for handheld or spindle mounted air tools - Google Patents

Abstract

  A high torque turbine rotor for lightweight handheld tools used for grinding and polishing, having a rotor with two separated high pressure air chambers separated by a common wall, each air chamber at the end of the rotor A terminal air discharge nozzle that is tangential. The rotor housing is lightweight and increases torque without normally increasing the overall size and weight of the tool housing.

Description

  The present invention relates to an aerodynamic, handheld or spindle mounted lightweight tool suitable for grinding and polishing, and more particularly to a turbine rotor for a lightweight grinding tool driven by an aerodynamically acting turbine. The turbine rotor generates high torque on the drive shaft without particularly increasing the size and weight of the grinding tool.

  In the prior art, lightweight air tools have been used for various applications such as grinding, polishing, metal or plastic finishing, plate making, drilling and deburring. The tool type is handheld and includes forms such as spindle mounted machines. Handheld tools typically include a narrow cylindrical outer housing with a handle that surrounds a rotor and a drive shaft like a pencil or pen. Lighter aerodynamic grinding tools can be manually operated for a longer period of time without causing any harm to the user as compared to very heavy electric motor tools.

  Prior art aerodynamic tools utilize either vane type fluid motors or repulsive rotors. The present invention does not employ a blade-type motor and utilizes a repulsive rotor. In order to obtain torque, the repulsive rotor releases high-pressure and high-speed air from the rotor in a tangential direction. The rotor is paired with the main drive shaft inside it.

  US Pat. No. 5,566,770, having the same assignee as the present invention, is relatively lightweight and comprises a tilted spindle that is moved by a single chamber rotor. Similarly, US Pat. No. 4,777,752, which has the same assignee as the present invention, discloses a single chamber turbine rotor that is relatively lightweight and has a high speed governor.

  The torque supplied by known turbine rotors is sufficient for lightweight and compact grinding and polishing tools, but higher torque is desired in grinding and polishing applications. However, expanding the rotor (and consequently the housing) to increase torque would make the housing weight, size and volume much larger and thus lack the advantages of a manually operable and lightweight tool.

  The present invention increases the torque of an air tool driven by a rotor without an increase in weight or size or complicated operation or manufacturing procedure. In fact, the torque can be increased by reducing the tool diameter. For example, an approximately 1 inch diameter rotor is approximately 0.2 horsepower at 50000 revolutions per minute (50000 RPM), but in the present invention, a 3/4 inch diameter rotor is approximately 0.3 horsepower at 50000 RPM. . In addition to increased power, the present invention provides a smaller profile tool. Furthermore, the present invention empties the rotor from 3 cubic feet per minute for a 1 inch single rotor to 2 cubic feet per minute for a 3/4 inch dual rotor as compared to a single rotor of comparable size and material. The pressure required to exercise is also reduced.

  The present invention uses a rotor with a small body having two high pressure air receiving chambers that share a common wall to reduce size and weight for increased torque. . The chambers of both rotor bodies are equipped with tangential discharge nozzles that generate torque to rotate the rotor. The present invention may also include two automatic governors that do not become complicated.

  Light weight tools are also desirable for spindle mounted ones because the tool of the present invention is supported on a movable arm.

  High torque turbine rotors mounted on handheld air tools or spindle mounted air tools have a narrow housing on the drive shaft. The rotor body receives a threaded drive shaft and has a threaded central opening that is fixedly attached to the drive shaft. The fixed drive shaft is partially hollow and has two sets of openings as inlets to the rotor body for high pressure air that powers the rotor body to rotate the drive shaft. A grinding member for grinding is attached to one end of the drive shaft. At the other end, a flexible air hose or high pressure air source is attached.

  The cylindrical rotor body includes a rigid cylindrical outer wall that divides the rotor body into two compartments, an inner central wall, and has a front opening and a rear opening. The cylindrical rotor body has a first annular chamber, a second annular chamber, and a common inner wall. The front and rear walls are connected to the cylindrical wall of the rotor forming two separate air receiving chambers.

  The front, rear and inner rotor walls each have a threaded opening for joining a threaded drive shaft. The cylindrical body of the rotor and the front, inner and rear walls provide two separate chambers in the rotor, a first annular chamber and a second annular chamber. The cylindrical wall of the rotor has multiple tangentially directed flow passages that are intentionally spaced to direct high pressure internal air outwards, resulting in rotor torque and shaft Produce torque.

  In a preferred form, the rotor chamber within each rotor body receives high pressure air from the drive shaft inlet. Each rotor body chamber has a cylindrical internal shape and includes four tangential air flow passages that discharge high pressure air in a tangential direction and an outer circumferential direction, and air is discharged from both chambers. And produces a repulsive force. The inner perimeter wall of each chamber continues from a narrow portion to a thicker portion, which has four tapered portions corresponding to four tangential air discharge paths. The tangential air discharge passages of the housing are arranged around the annular chamber at an interval of about 90 °. In a preferred form, it has two separate chambers separated by a common inner wall, each chamber having a discharge tangentially spaced four tangential ends. Therefore, each rotor body has eight separated discharge paths. By using eight separate discharge paths, the torque of the single rotor is greatly increased.

  In a preferred form, each rotor body chamber (first chamber and second chamber) is provided with a governor for limiting the overall rotational speed of the rotor and shaft, as disclosed in US Pat. No. 4,777,752. Prepare. The governor and each chamber described in US Pat. No. 4,777,752 includes an annular perforated barrier and an elastic O-ring that fits within the annular perforated barrier. The rotor chamber wall is provided with an annular groove to hold the annular perforated barrier. As the rotor speed increases, the elastic O-ring expands outward under centrifugal force and elastically engages the annular perforated barrier, thereby under pressure from the air inlet to the end discharge nozzle, Shut off air to adjust force and rotor speed.

  There are various types of turbine rotors that can be used, but in order to increase the amount of torque that can be obtained with current rotors, the turbine rotor housing must be expanded. Vibration, noise, and increased friction of turbine parts, causing operator fatigue.

  An object of the present invention is a lightweight aerodynamic grinding tool capable of maintaining a constant rotational speed under a load condition without causing unnecessary vibration, and a housing narrowed for a comfortable holding property during use. An aerodynamic grinding tool capable of increasing torque without causing vibration while maintaining the above.

  It is also an object of the present invention to provide a lightweight grinding tool having a repulsive rotor that produces a large torque with a relatively small size and weight.

  It is also an object of the present invention to provide a turbine rotor for a drive shaft of a tool as described above that is relatively lightweight and compact and produces much greater torque than the prior art.

  The present invention will be clarified by the contents of the accompanying drawings according to these and other objects which will become apparent below.

  Reference will now be made to the drawings, and particularly to FIGS. The turbine rotor of the present invention is generally designated by the reference numeral 10. An externally extended tool housing with a rotor, shaft, and bearing in a handheld is shown in FIG. 1B. The turbine rotor 10 is used in handheld or spindle mounted tools as shown in FIG. 1B and is suitable for operations such as grinding and polishing.

  The turbine rotor body 10 preferably has two spaced internal high pressure air receiving chambers (first chamber, second chamber), which are formed by a front wall 12, an intermediate inner wall 14, and a rear wall 16. ing. The rotor body 10 is usually cylindrical. The front wall 12 and the rear wall 16 may have the same shape. The front wall 12, the inner wall 14 and the rear wall 16 are frictionally fitted to each other and normally impervious to air. For example, the front wall 12 and the rear wall 16 each have an outer peripheral flange that extends and engages the outer peripheral end of the chamber wall of the intermediate wall 14. As a preferred form, the front wall 12 and the rear wall 16 are press-fitted into the intermediate wall 14. However, the front wall 12, the rear wall 16 and the intermediate wall 14 may be bonded to each other, or may be removably or permanently attached with other metal clips or the like.

  The anterior wall 12 includes a centrally threaded lumen 18. In a preferred form, the lumen 18 is threaded to match the thread on the drive shaft 60 as shown in FIGS. The drive shaft 60 has a hollow opening that serves as an inlet for high pressure air into the chamber of the rotor body 10 to propel the rotor body 10. As other connection forms with the drive shaft 60, both removable and non-removable ones such as adhesion, welding, and frictional engagement with the drive shaft 60 are assumed. The front wall 12 and the rear wall 16 may be formed of plastic, metal, or other suitable lightweight, strong material that is normally impermeable to air. When the rotor body is engaged with the shaft, torque generated in the rotor is transmitted to the shaft, and the shaft rotates.

  The common inner wall 14 may also be formed of plastic, metal, or other suitable material. The inner wall 14 includes a threaded central hole 44 that matches the thread of the drive shaft 60 of the tool.

  As a preferred form of the rotor body 10, as disclosed in US Pat. No. 4,776,752, each rotor housing chamber is provided with a speed governor. Preferably, the governor comprises a first annular chamber area 20 on the front surface 48 of the inner wall 14. Extending from the outer portion 52 of the first annular chamber 20 is at least one first arcuate chamber 24. As shown in FIGS. 1 to 4, as a preferred embodiment, four first arc chambers 24 are provided to extend from the outer portion 52 of the first annular chamber 20 to the outer periphery 56 of the inner wall 14. The arcuate chamber 24 is open to the first outer peripheral opening 58.

  The first elastic valve O-ring 32 is attached to the first annular chamber 20 and regulates and restricts the flow rate of air from the first annular chamber 20 to the first arcuate chamber 24. Extending from the first valve O-ring is an annular first perforated barrier 22. When high pressure air (approximately 90 psi) is introduced into the rotor body 10 and the rotor speed reaches the set speed value, the valve O-ring 32 is deformed relative to the perforated barrier 22, thereby reducing the air flow rate. Limit and reduce rotor speed.

  As shown in FIG. 3, the rotor body 10 includes a second annular chamber 26 on the rear surface 50 of the inner wall 14. Extending from the outer portion 54 of the second annular chamber 26 is at least one second arcuate chamber 30. As a preferred form, four second arcuate chambers 30 (each 90 ° apart) are provided extending from the outer portion 54 of the second annular chamber 26 to the outer periphery 56 of the rotor body 10. The second arcuate chamber 30 is open to the second outer peripheral opening 62. As shown in FIGS. 1 and 2, the first arc-shaped chamber 24 and the second arc-shaped chamber 30 are disposed corresponding to the first and second outer peripheral openings 58 and 62. The air circulation openings 58 and 62 are tangentially directional to the cylindrical rotor body 10 and discharge high-pressure air for rotating the rotor body 10 in the tangential direction. However, such an arrangement of inlets 58, 62 is not necessary in the operation of the present invention.

  The second annular chamber 26 also includes a second elastic O-ring 34 to regulate and limit the flow of air from the second annular chamber 26 to the second arcuate chamber 30. Extending radially from the second bulb O-ring 34 is an annular second perforated barrier 28. Thus, when air is directed to the turbine rotor 10 and the rotor reaches the set speed, the ring 34 of the second resilient valve deforms against the perforated barrier 28 as the rotor rotates, thereby Limit air flow and reduce rotor speed.

  The valve O-rings 32 and 34 are usually elastic and are made of rubber. The entire turbine rotor 10 (except for the valve O-ring) is made of a hard plastic material. The bearing of the turbine rotor 10 does not need to be lubricated. The perforated barriers 22, 28 are made of plastic or metal or other suitable material. The perforated barriers 22, 28 are formed on the inner wall in a single body, or are removably or permanently attached to the front surface 48 and back surface 50 of the inner wall 14. The perforated barriers 22 and 28 may have a fence-like structure as shown in FIG. However, equivalent structures are also envisaged.

  Further, as a preferred form, the groove 36 in the front wall 12 and the groove 40 in the front surface of the inner wall 14 are arranged such that the first perforated barrier 22 is at an appropriate position in the turbine rotor body 10. Similarly, the groove 38 in the rear wall 16 and the groove 42 in the back surface 50 of the inner wall 14 cause the second perforated barrier 28 to be placed at an appropriate position in the turbine rotor body 10. One groove may be used to properly place the perforated barrier.

  In operation, the preferred form of the turbine rotor 10 operates as follows. Pressurized air (approximately 90 psi) advances from the drive shaft 60 to the central holes 18, 44, 46 in the front wall 12, inner wall 14, and rear wall 16 and enters the turbine rotor 10. Pressurized air enters the first and second annular chambers 20, 26 and swirls the first and second valve O-rings 32, 34 through the first and second perforated barriers 22, 28. To the first and second arcuate chambers 24, 30. The air is then decompressed and reaches from the arcuate chambers 24, 30 to the outer peripheral openings 58, 62 at the outer periphery 56 of the inner wall 14. These end openings act as tangential nozzles and provide an air flow that generates a force to rotate the turbine. The turbine rotor 10 is rotated by the repulsive force of the air.

  As a preferred form, each drive chamber is provided with a speed governor disclosed in US Pat. No. 4,772,652. The turbine 10 is rotated at a predetermined speed by elastic deformation caused by the centrifugal force of the valve O-rings 32 and 34 with respect to the perforated barriers 22 and 28. When the turbine rotor 10 rotates at a high rotational speed, the first and second valve O-rings 32 and 34 are deformed and press the punched holes of the first and second perforated barriers 22 and 28. The deformation of the valve O-rings 32, 34 limits the air flow rate through the punched holes in the barriers 22, 28, thereby reducing the rotational force. Eventually equilibrium is reached, whereby a constant rotational speed of the turbine rotor 10 is obtained.

  The torque of the turbine rotor 10 of the present invention is greatly increased compared to the prior art. For example, when compared to a two-layer turbine rotor, the present invention can have less weight, vibration, noise, and air volume, and less wearable moving parts.

  5 and 6 illustrate another embodiment of the present invention. As shown in FIGS. 5 and 6, the rotor housing is narrowed while reducing weight and increasing torque.

  Due to the structure of the turbine rotor 10 having a large number of annular chambers and a number of arcuate chambers, it is possible to increase the torque from prior art air turbines without particularly increasing the weight of the spindle device. Furthermore, there is less vibration than when single turbines are stacked on top of each other. Another embodiment is also envisioned in which additional annular and arcuate chambers are formed between the first and second chambers. These additional chambers may include a valve O-ring and a perforated barrier, as shown here for rotational speed adjustment. Furthermore, although the present invention has been described as operating with the force of air, other gases are also envisioned, depending on other applications.

  The present invention has been shown and described herein in what appears to be the most practical and preferred embodiment. However, it will be appreciated that changes may be made within the scope of the invention and that obvious modifications may occur to those skilled in the art.

FIG. 2 is an exploded view and a perspective view of a preferred embodiment of the present invention. It is a side view of another form of this invention. 1 is a side cross-sectional view of a preferred form of the invention. 1 is a preferred perspective view of the present invention. FIG. FIG. 2 is a side cross-sectional view of the preferred invention. It is a partial exploded assembly figure of a desirable form, and a partial section perspective view. It is a perspective view of another form. It is a side view of another form of this invention.

Claims (33)

A high torque turbine rotor used in a handheld air tool or a spindle mounted air tool,
Comprising a rotor body having an inlet connectable to a high pressure air source;
The rotor body is
A first annular chamber;
A second annular chamber, and a common inner wall, wherein the first annular chamber and the second annular chamber are separated by the common inner wall,
The rotor body has a cylindrical shape and has a plurality of tangential directions in fluid communication with the housing of the first chamber and the housing of the second chamber that discharge high-pressure air to rotate the rotor body. The end nozzle of
A high torque turbine rotor, wherein the inner wall includes a central hole for receiving a joint to a drive shaft. The high torque turbine rotor according to claim 1, wherein the rotor further includes a speed governor in the first chamber and the second chamber. The speed governor includes a front wall, at least one helical wall barrier extending from an outer portion of each annular chamber, a valve O-ring in each annular chamber, and each annular chamber. The high torque turbine rotor of claim 2, having an annular perforated barrier and a rear wall that are inward and extend outwardly from the valve O-ring. The high torque turbine rotor of claim 3, wherein each of the perforated barriers is integral with the rotor body of the rotor. The high torque turbine rotor of claim 1, wherein four arcuate chambers extend radially from each of the annular chambers. A groove is engraved in the front wall and a front inner surface of the inner wall to fit a first perforated barrier, and a second perforated barrier is fitted to the rear wall and the rear inner surface of the inner wall. The high torque turbine rotor of claim 3, wherein the grooves are carved for. The high torque turbine rotor according to claim 3, wherein the valve O-ring is an elastic rubber. The common inner wall is
One or more further annular chambers and further spiral wall barriers between the two annular chambers and the two helical wall barriers, and located in each further annular chamber; A further annular perforated barrier radially outward from the valve O-ring and the further valve O-ring radially inward from the further annular perforated barrier. The high torque turbine rotor according to claim 3. The high torque turbine rotor according to claim 1, wherein the inner wall includes a narrow waist portion. The high torque turbine rotor according to claim 3, wherein components other than the valve O-ring are made of plastic. The high torque turbine rotor according to claim 3, wherein the front wall and the rear wall are detachably attached to the inner wall. The high torque turbine rotor according to claim 11, wherein the front wall and the rear wall are attached to the inner wall by a frictional force. 2. The high torque turbine rotor according to claim 1, wherein the plurality of tangential end nozzles in communication with the first annular chamber are arranged side by side with the plurality of tangential end nozzles in communication with a second annular chamber. A rotor body for a high torque turbine rotor,
A rotor body having a central hole, the rotor body having a cylindrical outer wall and a central inner wall;
further,
A front surface comprising at least one first annular path end at at least one first arcuate path end in at least one first outer peripheral opening;
A rear surface comprising at least one second annular path end at at least one second arcuate path end in at least one second outer peripheral opening;
A rotor body for a high torque turbine rotor. A first groove in the first annular path for mating the first perforated barrier and a second groove in the second annular path for mating the second perforated barrier; The rotor body according to claim 14 comprising. The first perforated barrier, the second perforated barrier, the first valve O-ring between the first perforated barrier and the central hole, and the second perforated barrier The rotor body according to claim 14, further comprising: a second valve O-ring located between the central hole and the central hole. A handheld air tool comprising a high torque turbine rotor body located around a main shaft,
The turbine rotor body comprises a front wall and a rear wall adapted to mate with an internal wall;
Each of the front wall and the rear wall includes a central hole and the inner wall adapted to be fitted to the front wall and the rear wall;
The inner wall includes at least two annular chambers, at least one arcuate chamber extending radially from an outer portion of each annular chamber, a valve O-ring in each annular chamber, and an outer side from the valve O-ring. A hand-held air tool comprising an annular perforated barrier in each annular chamber located radially and a central hole. A handheld air tool,
Said turbine having a high torque turbine rotor having an outer wall and a rotating shaft; means for mounting said turbine rotor for rotating about said rotating shaft of a drive shaft; and an inner wall and a chamber for receiving at least two high pressure airs A rotor, means for feeding pressurized air into the two chambers, the turbine rotor having an air flow passage in each chamber, and the end of the air flow passage in a tangential nozzle in the outer wall of the rotor; A hand-held air tool comprising: a pressurized fluid, thereby providing rotation to the turbine rotor. 19. A handheld air tool according to claim 18, wherein the rotor body comprises a chamber wall separating the two chambers. Elastic sealing means located in each of the annular chambers, the elastic sealing means being capable of being moved outward by centrifugal force to restrict the pressurized fluid passing through the perforated barrier, the perforated barrier 19. The elastic seal means of claim 18, further comprising the elastic sealing means capable of flowing the pressurized fluid without restriction until moved outward by centrifugal force to restrict the pressurized fluid through Handheld air tool. A high torque turbine rotor for handheld or spindle mounted air tools,
Means for generating torque in a cylindrical body having an inlet connectable to a high pressure air source, the torque generating means comprising:
Means for generating torque in the first chamber of the body; means for generating torque in the second chamber of the body; means for isolating the first chamber from the second chamber; Means for connecting the torque generating means to the shaft. The said rotor further comprises a means for adjusting the rotation speed of the rotor arrange | positioned between the said 1st means to generate a torque, and the said 2nd means to generate a torque. The high torque turbine rotor according to claim 21. A high torque turbine rotor for handheld or spindle mounted air tools,
An inlet that can be connected to a high-pressure air source
Comprising a first annular chamber;
Comprising a first plurality of tangential end nozzles in communication with the first annular chamber;
Comprising a second annular chamber;
Comprising a second plurality of tangential end nozzles in communication with the second annular chamber;
A handheld that accepts a drive shaft and has a common inner wall with a central bore for connection to the drive shaft, the first annular chamber and the second annular chamber being separated by the common inner wall Or high torque turbine rotor for spindle mounted air tools. 24. The high torque turbine rotor according to claim 23, further comprising a first rotational speed governor in the first annular chamber and a second rotational speed governor in the second annular chamber. The first rotational speed governor and the second rotational speed governor are:
At least one helical wall extending outwardly from an outer portion of the annular chamber;
A valve O-ring in the annular chamber;
The high torque turbine rotor of claim 24, comprising an annular perforated barrier in the annular chamber extending outwardly from the valve O-ring. The high torque turbine rotor of claim 25, wherein each of the perforated barriers is integrally formed with the rotor body. The high torque turbine rotor of claim 23, wherein four arcuate chambers extend radially from each of the annular chambers. The high torque turbine rotor according to claim 23, comprising a front wall adjacent to the common inner wall and a rear wall adjacent to the common inner wall.
A groove is engraved on the front wall and a front inner surface of the common inner wall to fit a first perforated barrier, and a second wall is formed on the rear wall and a rear inner surface of the common inner wall. A high torque turbine rotor with grooves cut to fit the perforated barriers. The high torque turbine rotor of claim 25, wherein the valve O-ring is made of elastic rubber. The high torque turbine rotor of claim 25, wherein the components except the valve O-ring are made of plastic. 29. The high torque turbine rotor according to claim 28, wherein the front wall and the rear wall are detachably attached to the common inner wall. 32. The high torque turbine rotor according to claim 31, wherein the front wall and the rear wall are attached to the inner wall by a frictional force. 24. The high torque turbine rotor of claim 23, wherein the first plurality of tangential end nozzles are aligned with the second plurality of tangential end nozzles.

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