EP3184733B1 - Vane-type air motor and air tool provided with vane-type air motor - Google Patents
Vane-type air motor and air tool provided with vane-type air motor Download PDFInfo
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- EP3184733B1 EP3184733B1 EP15863474.1A EP15863474A EP3184733B1 EP 3184733 B1 EP3184733 B1 EP 3184733B1 EP 15863474 A EP15863474 A EP 15863474A EP 3184733 B1 EP3184733 B1 EP 3184733B1
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- Prior art keywords
- vane
- rotor
- cut
- air
- air motor
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- 230000002093 peripheral effect Effects 0.000 claims description 41
- 230000009471 action Effects 0.000 claims description 10
- 230000001737 promoting effect Effects 0.000 claims description 9
- 230000000717 retained effect Effects 0.000 claims description 4
- 238000005498 polishing Methods 0.000 description 8
- 238000002474 experimental method Methods 0.000 description 7
- 230000006872 improvement Effects 0.000 description 5
- 239000003082 abrasive agent Substances 0.000 description 4
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000013536 elastomeric material Substances 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
- F01C1/00—Rotary-piston machines or engines
- F01C1/30—Rotary-piston machines or engines having the characteristics covered by two or more groups F01C1/02, F01C1/08, F01C1/22, F01C1/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
- F01C1/34—Rotary-piston machines or engines having the characteristics covered by two or more groups F01C1/02, F01C1/08, F01C1/22, F01C1/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F01C1/08 or F01C1/22 and relative reciprocation between the co-operating members
- F01C1/344—Rotary-piston machines or engines having the characteristics covered by two or more groups F01C1/02, F01C1/08, F01C1/22, F01C1/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F01C1/08 or F01C1/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
- F01C21/00—Component parts, details or accessories not provided for in groups F01C1/00 - F01C20/00
- F01C21/08—Rotary pistons
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B23/00—Portable grinding machines, e.g. hand-guided; Accessories therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B21/00—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
- B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
- F01C1/00—Rotary-piston machines or engines
- F01C1/30—Rotary-piston machines or engines having the characteristics covered by two or more groups F01C1/02, F01C1/08, F01C1/22, F01C1/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
- F01C1/34—Rotary-piston machines or engines having the characteristics covered by two or more groups F01C1/02, F01C1/08, F01C1/22, F01C1/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F01C1/08 or F01C1/22 and relative reciprocation between the co-operating members
- F01C1/344—Rotary-piston machines or engines having the characteristics covered by two or more groups F01C1/02, F01C1/08, F01C1/22, F01C1/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F01C1/08 or F01C1/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member
- F01C1/3441—Rotary-piston machines or engines having the characteristics covered by two or more groups F01C1/02, F01C1/08, F01C1/22, F01C1/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F01C1/08 or F01C1/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member the inner and outer member being in contact along one line or continuous surface substantially parallel to the axis of rotation
- F01C1/3442—Rotary-piston machines or engines having the characteristics covered by two or more groups F01C1/02, F01C1/08, F01C1/22, F01C1/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F01C1/08 or F01C1/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member the inner and outer member being in contact along one line or continuous surface substantially parallel to the axis of rotation the surfaces of the inner and outer member, forming the working space, being surfaces of revolution
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
- F01C13/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01C13/02—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby for driving hand-held tools or the like
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2250/00—Geometry
- F04C2250/20—Geometry of the rotor
Definitions
- the present invention relates to a vane air motor and an air tool having a vane air motor.
- a vane air motor usable as a driving device for an air-driven polishing machine or the like has, as disclosed, for example, in Patent Literature 1, a housing having a rotor accommodating chamber with a circular cylindrical inner peripheral surface, a rotor rotatably retained in the rotor accommodating chamber such that the rotational center axis of the rotor is eccentric with respect to the rotor accommodating chamber, and a plurality of vanes slidably disposed in respective vane accommodating grooves provided on the outer peripheral surface of the rotor.
- the housing is provided with an air supply port and an air discharge port which open into the rotor accommodating chamber. When compressed air flows from the air supply port toward the air discharge port in one direction around the rotor in the rotor accommodating chamber, the compressed air acts on the vanes projecting outward from the outer peripheral surface of the rotor, thus rotationally driving the rotor.
- Patent Literature 1 Japanese Patent Application Publication No. 2010-159689
- a start-up failure may occur in which the rotor fails to rotate even when compressed air is supplied thereto.
- the cause of the start-up failure may be as follows. When the rotor is being driven to rotate at high speed by compressed air, the vanes are urged to be displaced outward by receiving a large centrifugal force and therefore rotate with the rotor, with the outer edges of the vanes being kept in contact with the inner peripheral surface of the housing.
- the inner peripheral surface of the housing is set eccentric with respect to the outer peripheral surface of the rotor, so that the vanes are displaced in such a manner as to reciprocate in the radial direction between a position where the vanes are completely pushed in the vane accommodating grooves and a position where the vanes are greatly pushed out from the vane accommodating grooves.
- the rotational speed of the rotor gradually slows downs, and the centrifugal force that the vanes receive gradually decreases correspondingly.
- the vanes when the vanes have been completely pushed into the vane accommodating grooves by the inner peripheral surface of the housing, the vanes may remain in the state of being accommodated in the vane accommodating grooves without projecting outward from the pushed-in positions even if the rotation of the rotor continues. If compressed air is supplied to drive the vane air motor again in this state, the compressed air cannot act on the vanes effectively, resulting in a start-up failure in which the rotor fails to rotate.
- US-7,255,546 discloses a spindle of a vane motor designed to enhance the power, speed and torque by undercutting the spindle adjacent to the vanes on the power stroke side to increase the working area of the vanes and by adding slots intermediate the vane formed in the spindle and each slot has a working face for accepting pressurized air during the power stroke.
- the slots are located out of coincidence with the rotating axis of the spindle and the vanes include a contoured bottom edge fitted into the slots so as to enhance its ability to be retracted in opposition to centrifugal force created by the rotating cylinder.
- US-2005/256,512 discloses a surgical motor designed for power, noise and heat reduction for powering surgical tools where the surgical motor is modular constructed to house the vane motor for generating power in one module and the chuck and output shaft in the other module.
- a coupling mechanism for transmitting rotary motion from the vane motor to the output shaft includes balls made from elastomeric material to reduce vibrations and noise.
- the vane motor includes vanes that are contoured on the bottom edge, the spindle is undercut adjacent the vanes and peripheral edge of the spindle is grooved to enhance power, the inlet opening to the vanes are repositioned to increase the volume of inlet air, the inner surface is contoured to define a crescent seal adjacent to the spindle outer surface, the inlet and outlet to the spindle are repositioned to increase the power stroke of the vane, the discharge holes are oriented so that the vane edge sees a uniform contact surface during each revolution, the cylinder includes flow passages for cooling the cylinder and for flowing a portion of the air over the support bearings mounted downstream of the cylinder and including a return passageway to feed the inlet holes so that all pressurized inlet air are directed to impinge on the vanes and seal means, one made operable in situ and the other operating adjacent the inner race of the bearing prevents leakage of oil into ambient and into path of the surgical tool and the surgical motor includes an insert housing radially spaced from the main housing defining an
- the present invention has been made in view of the above-described assumption of the cause, and an object of the present invention is to provide a vane air motor capable of starting driving even more reliably and an air tool having such a vane air motor.
- the present invention provides a vane air motor as defined in claim 1.
- Compressed air is supplied from an air supply port opening on the inner peripheral surface and passed around the rotor in one direction before being discharged from an air discharge port located at a position circumferentially spaced from the air supply port, so that the compressed air acts on the vane to rotationally drive the rotor.
- the rotor has a cut-out portion for promoting vane pushing-out action which is provided on the outer peripheral surface to intersect the vane accommodating groove.
- the cut-out portion may be provided to intersect only a rear side of the vane accommodating groove in the rotational direction of the rotor when driven to rotate.
- the cut-out portion is located on the upstream side of the flow of compressed air in the housing; therefore, compressed air can flow into the vane accommodating groove even more easily.
- the cut-out portion may be provided at a position spaced from the air supply port in the direction of the rotational center axis.
- the air supply port may be provided at a central position of the inner peripheral surface in the direction of the rotational center axis, and the cut-out portion may be provided to intersect the opposite ends of the vane accommodating groove in the direction of the rotational center axis.
- the cut-out portion may be provided to intersect a central position of the vane accommodating groove in the direction of the rotational center axis.
- the cut-out portion may comprise a plurality of grooves extending in the circumferential direction of the outer peripheral surface of the rotor and spaced from each other in the direction of the rotational center axis.
- the present invention provides an air tool comprising: the above-described vane air motor; a tool body retaining the vane air motor; and a driven part drivably connected to the vane air motor.
- a pneumatic polishing machine 10 has a vane air motor 12, a tool body 14 retaining the vane air motor 12, and an abrasive holding member 18 drivably connected to the vane air motor 12 and holding an abrasive material 16 at a distal end bottom surface 18b thereof.
- the tool body 14 is provided with a compressed-air supply path 20 extending from a rear end 14a thereof to the vane air motor 12, and a valve member 22 disposed halfway in the compressed-air supply path 20.
- the valve member 22 is sealingly engaged with a valve seat 23 provided in the compressed-air supply path 20 to close the compressed-air supply path 20.
- the tool body 14 further has an operating lever 24 pivotably attached thereto to open and close the valve member 22.
- the operating lever 24 is equipped with a safety lock 26.
- the safety lock 26 In the state shown in Fig. 1 , the safety lock 26 is engaged with the tool body 14 to lock the operating lever 24 from being pivoted toward the tool body 14.
- an operating part 26a of the safety lock 26 is pushed forward to rotate the safety lock 26 counterclockwise as seen in the figure so that the safety lock 26 is disengaged from the tool body 14.
- the operating lever 24 is pivoted toward the tool body 14. Consequently, a valve operating shaft 28 projecting from the tool body 14 is pushed in by the operating lever 24, causing the valve member 22 to be tilted.
- a sliding engagement projection 34 located on a top portion 18a of the abrasive holding member 18 is slidingly engaged by a sliding retaining portion 36 of the tool body 14 so that the sliding engagement projection 34 is allowed to move in a longitudinal direction (left-right direction as seen in the figure) but restrained from moving in a lateral direction (depth direction as seen in the figure). Accordingly, when the vane air motor 12 is driven to rotate, the abrasive holding member 18 is driven so that the abrasive material 16 attached to the distal end bottom surface 18b performs a reciprocating elliptical motion in a plane perpendicularly intersecting the rotational center axis R.
- the polishing machine 10 is an air tool configured to polish a member to be polished by pressing the abrasive material 16, which moves in a reciprocating elliptical motion as stated above, against the member to be polished.
- the vane air motor 12 disposed in the tool body 14 of the polishing machine 10 has, as shown in Figs. 1 to 4 , a housing 38 having a rotor accommodating chamber 38b with a circular cylindrical inner peripheral surface 38a, a rotor 40 rotatably retained in the rotor accommodating chamber 38b, and vanes 42 slidably disposed in respective vane accommodating grooves 40a formed in the rotor 40.
- a center axis C of the inner peripheral surface 38a, which defines the rotor accommodating chamber 38b, and the rotational center axis R of the rotor 40 are parallel to each other at respective positions eccentric with respect to each other ( Figs. 2 and 3 ). As shown in Fig.
- each vane accommodating groove 40a there are four vane accommodating grooves 40a provided on an outer peripheral surface 40b of the rotor 40, being equally spaced from each other in the circumferential direction of the outer peripheral surface 40b.
- Each vane accommodating groove 40a extends on the outer peripheral surface 40b in parallel to the rotational center axis R of the rotor 40 and also extends inward from the outer peripheral surface 40b toward the rotational center axis R.
- the outer peripheral surface 40b of the rotor 40 is provided with cut-out portions 44 for promoting vane pushing-out action at the opposite ends of each vane accommodating groove 40a. The cut-out portions 44 intersect the associated vane accommodating groove 40a at a predetermined depth from the outer peripheral surface 40b.
- each cut-out portion 44 has a cut plane perpendicularly intersecting the associated vane accommodating groove 40a over a length approximately equal to one-fifth of the length of the rotor 40 in the direction of the rotational center axis R.
- the cut-out portions 44 are provided only at the rear side of each vane accommodating groove 40a as viewed in the rotational direction of the rotor 40 when driven to rotate (i.e. only at the upstream side of the flow of compressed air).
- each vane accommodating groove 40a has an outer surface 42a facing radially outward of the rotor 40, and an inner surface 42b facing radially inward of the rotor 40, and is radially slidable between a position where the vane 42 is pushed into the vane accommodating groove 40a by the inner peripheral surface 38a of the rotor accommodating chamber 38b, as in the case of the vane 42 located at the upper position as seen in Fig.
- the housing 38 is provided with an air supply port 38c ( Fig. 2 ) opening on the inner peripheral surface 38a at a central position in the axial direction thereof to receive compressed air, and air discharge ports 38d ( Fig.
- Table 1 below shows the results of an experiment carried out to compare between a grinding machine having a conventional vane air motor and a grinding machine having the vane air motor 12 of the present invention in terms of the frequency of occurrence of a start-up failure in each of the grinding machines at various pressures of compressed air used.
- the experiment was carried out by repeating start and stop operations 100 times for each grinding machine having the above-described vane air motor and counting the number of times at which the vane air motor failed to start.
- the grinding machines used in the experiment were the same except that one vane air motor had the cut-out portions 44 and the other vane air motor had no cut-out portions 44.
- cut-out portions 144 provided in a rotor 140 are disposed so that each cut-out portion 144 intersects the central position of the associated vane accommodating groove 140a.
- the cut-out portion 144 forms an arcuate surface gradually becoming shallower as the distance from the center of the rotor 140 in the direction of the rotational center axis R increases toward the opposite ends of the rotor 140. It should be noted that the cut-out portion 144 is configured not to intersect either of the opposite end portions of the vane accommodating groove 140a.
- cut-out portions 244 provided in a rotor 240 are formed as grooves of rectangular section extending in the circumferential direction of an outer peripheral surface 240b of the rotor 240.
- the groove-shaped cut-out portions 244 are provided to extend circumferentially and contiguously around the outer peripheral surface 240b of the rotor 240 while crossing vane accommodating grooves 240a.
- the cut-out portions 244 are provided such that three groove-shaped cut-out portions extend parallel to each other and are equally spaced from each other in the direction of the rotational center axis R of the rotor 240.
- the start-up failure occurred 2 times out of 100 trials.
- the vane air motors 12, 112 and 212 according to all the embodiments of the present invention showed an improvement in the start-up failure rate over the conventional vane air motor.
- a significant improvement effect was observed with the vane air motor 12, shown in Fig. 4 , which has the cut-out portions 44 provided at both ends of the rotor 40, and the vane air motor 212, shown in Fig. 6 , which has the cut-out portions 244 provided in the form of three grooves extending in the circumferential direction of the rotor 240.
- All the vane air motors used in this experiment had a structure in which the air supply port 38c is provided at a central position in the axial direction of the housing 38, and the air discharge ports 38d are provided at respective positions near the axially opposite ends of the housing 38.
- the cut-out portions 44, 144 and 244 are provided on the outer peripheral surfaces 40b, 140b and 240b of the rotors 40, 140 and 240 so as to intersect the vane accommodating grooves 40a, 140a and 240a, respectively. It is therefore conceivable that it is easier for compressed air to flow into the vane accommodating grooves 40a, 140a and 240a than in the conventional vane air motor without cut-out portions.
- the vane accommodating grooves 40a, 140a and 240a are provided so as to extend radially toward the respective centers of the rotors 40, 140 and 240, the vane accommodating grooves 40a, 140a and 240a may extend in a direction different from the radial direction. Further, the number of vane accommodating grooves 40a, 140a and 240a and vanes 42, 142 and 242 may be set to any desired value.
- the present invention has been explained above with regard to the polishing machine 10, in which a driven part that is driven by the vane air motor 12, 112 or 212 is the abrasive holding member 18, as one embodiment of an air tool having the vane air motor 12, 112 or 212, the present invention is also applicable to other air tools, such as a grinding machine, a drill, etc., by replacing the driven part with other elements.
- Polishing machine 10 vane air motor 12; tool body 14; rear end 14a; abrasive material 16; abrasive holding member 18; top portion 18a; distal end bottom surface 18b; compressed-air supply path 20; valve member 22; valve seat 23; operating lever 24; safety lock 26; operating part 26a; valve operating shaft 28; rotary drive shaft 30; bearing 32; sliding engagement projection 34; sliding retaining portion 36; housing 38; inner peripheral surface 38a; rotor accommodating chamber 38b; air supply port 38c; air discharge ports 38d; rotor 40; vane accommodating grooves 40a; outer peripheral surface 40b; vanes 42; outer surface 42a; inner surface 42b; side surfaces 42c; cut-out portions 44; space 46; compressed-air discharge path 48; vane air motor 112; rotor 140; vane accommodating grooves 140a; vanes 142; cut-out portions 144; vane air motor 212; rotor 240; vane accommodating grooves 240a; outer peripheral surface 240b; vanes 242; cut-out
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Rotary Pumps (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
- Portable Power Tools In General (AREA)
Description
- The present invention relates to a vane air motor and an air tool having a vane air motor.
- A vane air motor usable as a driving device for an air-driven polishing machine or the like has, as disclosed, for example, in Patent Literature 1, a housing having a rotor accommodating chamber with a circular cylindrical inner peripheral surface, a rotor rotatably retained in the rotor accommodating chamber such that the rotational center axis of the rotor is eccentric with respect to the rotor accommodating chamber, and a plurality of vanes slidably disposed in respective vane accommodating grooves provided on the outer peripheral surface of the rotor. The housing is provided with an air supply port and an air discharge port which open into the rotor accommodating chamber. When compressed air flows from the air supply port toward the air discharge port in one direction around the rotor in the rotor accommodating chamber, the compressed air acts on the vanes projecting outward from the outer peripheral surface of the rotor, thus rotationally driving the rotor.
- Patent Literature 1:
Japanese Patent Application Publication No.2010-159689 - In the above-described vane air motor, however, a start-up failure may occur in which the rotor fails to rotate even when compressed air is supplied thereto. The cause of the start-up failure may be as follows. When the rotor is being driven to rotate at high speed by compressed air, the vanes are urged to be displaced outward by receiving a large centrifugal force and therefore rotate with the rotor, with the outer edges of the vanes being kept in contact with the inner peripheral surface of the housing. The inner peripheral surface of the housing is set eccentric with respect to the outer peripheral surface of the rotor, so that the vanes are displaced in such a manner as to reciprocate in the radial direction between a position where the vanes are completely pushed in the vane accommodating grooves and a position where the vanes are greatly pushed out from the vane accommodating grooves. In this regard, however, when the supply of compressed air is stopped to stop the drive of the vane air motor, the rotational speed of the rotor gradually slows downs, and the centrifugal force that the vanes receive gradually decreases correspondingly. Accordingly, when the vanes have been completely pushed into the vane accommodating grooves by the inner peripheral surface of the housing, the vanes may remain in the state of being accommodated in the vane accommodating grooves without projecting outward from the pushed-in positions even if the rotation of the rotor continues. If compressed air is supplied to drive the vane air motor again in this state, the compressed air cannot act on the vanes effectively, resulting in a start-up failure in which the rotor fails to rotate.
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US-7,255,546 discloses a spindle of a vane motor designed to enhance the power, speed and torque by undercutting the spindle adjacent to the vanes on the power stroke side to increase the working area of the vanes and by adding slots intermediate the vane formed in the spindle and each slot has a working face for accepting pressurized air during the power stroke. The slots are located out of coincidence with the rotating axis of the spindle and the vanes include a contoured bottom edge fitted into the slots so as to enhance its ability to be retracted in opposition to centrifugal force created by the rotating cylinder. -
US-2005/256,512 discloses a surgical motor designed for power, noise and heat reduction for powering surgical tools where the surgical motor is modular constructed to house the vane motor for generating power in one module and the chuck and output shaft in the other module. A coupling mechanism for transmitting rotary motion from the vane motor to the output shaft includes balls made from elastomeric material to reduce vibrations and noise. The vane motor includes vanes that are contoured on the bottom edge, the spindle is undercut adjacent the vanes and peripheral edge of the spindle is grooved to enhance power, the inlet opening to the vanes are repositioned to increase the volume of inlet air, the inner surface is contoured to define a crescent seal adjacent to the spindle outer surface, the inlet and outlet to the spindle are repositioned to increase the power stroke of the vane, the discharge holes are oriented so that the vane edge sees a uniform contact surface during each revolution, the cylinder includes flow passages for cooling the cylinder and for flowing a portion of the air over the support bearings mounted downstream of the cylinder and including a return passageway to feed the inlet holes so that all pressurized inlet air are directed to impinge on the vanes and seal means, one made operable in situ and the other operating adjacent the inner race of the bearing prevents leakage of oil into ambient and into path of the surgical tool and the surgical motor includes an insert housing radially spaced from the main housing defining an air gap for reducing heat and the in the handle and resilient mounting means to isolate the vibrations to reduce noise and a thrust path bypassing the vane motor. - The present invention has been made in view of the above-described assumption of the cause, and an object of the present invention is to provide a vane air motor capable of starting driving even more reliably and an air tool having such a vane air motor.
- The present invention provides a vane air motor as defined in claim 1. Compressed air is supplied from an air supply port opening on the inner peripheral surface and passed around the rotor in one direction before being discharged from an air discharge port located at a position circumferentially spaced from the air supply port, so that the compressed air acts on the vane to rotationally drive the rotor. In the vane air motor, the rotor has a cut-out portion for promoting vane pushing-out action which is provided on the outer peripheral surface to intersect the vane accommodating groove.
- We carried out an experiment in which a conventional vane air motor likely to suffer a start-up failure as stated above was provided with the above-described cut-out portion for promoting vane pushing-out action. As a result, a clear improvement was observed in the start-up failure rate. The reason for the improvement has not yet been clarified, but it is conceivable that, when supplied, compressed air can easily flow into the vane accommodating groove through the cut-out portion for promoting vane pushing-out action, and this increases the pressure in the vane accommodating groove, resulting in an increase in the pressure difference between the pressure in the vane accommodating groove and the pressure in the space outside the vane where compressed air is flowing at high speed, thereby allowing the vane to be easily displaced outward of the rotor.
- Preferably, the cut-out portion may be provided to intersect only a rear side of the vane accommodating groove in the rotational direction of the rotor when driven to rotate.
- With the above-described structure, the cut-out portion is located on the upstream side of the flow of compressed air in the housing; therefore, compressed air can flow into the vane accommodating groove even more easily.
- Preferably, the cut-out portion may be provided at a position spaced from the air supply port in the direction of the rotational center axis.
- Specifically, the air supply port may be provided at a central position of the inner peripheral surface in the direction of the rotational center axis, and the cut-out portion may be provided to intersect the opposite ends of the vane accommodating groove in the direction of the rotational center axis.
- Alternatively, the cut-out portion may be provided to intersect a central position of the vane accommodating groove in the direction of the rotational center axis.
- Alternatively, the cut-out portion may comprise a plurality of grooves extending in the circumferential direction of the outer peripheral surface of the rotor and spaced from each other in the direction of the rotational center axis.
- In addition, the present invention provides an air tool comprising: the above-described vane air motor; a tool body retaining the vane air motor; and a driven part drivably connected to the vane air motor.
- Embodiments of a vane air motor and air tool according to the present invention will be explained below on the basis of the accompanying drawings.
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Fig. 1 is a sectional view of a pneumatic polishing machine having a vane air motor according to an embodiment of the present invention. -
Fig. 2 is a sectional view of the vane air motor taken along the line A-A inFig. 1 . -
Fig. 3 is a sectional view of the vane air motor taken along the line B-B inFig. 1 . -
Fig. 4 is an exploded perspective view of a rotor and vanes of the vane air motor according to the embodiment of the present invention. -
Fig. 5 is an exploded perspective view of a rotor and vanes of a vane air motor according to another embodiment of the present invention. -
Fig. 6 is an exploded perspective view of a rotor and vanes of a vane air motor according to still another embodiment of the present invention. - As shown in
Fig. 1 , apneumatic polishing machine 10 according to an embodiment of the present invention has avane air motor 12, atool body 14 retaining thevane air motor 12, and anabrasive holding member 18 drivably connected to thevane air motor 12 and holding anabrasive material 16 at a distalend bottom surface 18b thereof. Thetool body 14 is provided with a compressed-air supply path 20 extending from arear end 14a thereof to thevane air motor 12, and avalve member 22 disposed halfway in the compressed-air supply path 20. In the state shown inFig. 1 , thevalve member 22 is sealingly engaged with avalve seat 23 provided in the compressed-air supply path 20 to close the compressed-air supply path 20. Thetool body 14 further has anoperating lever 24 pivotably attached thereto to open and close thevalve member 22. Theoperating lever 24 is equipped with asafety lock 26. In the state shown inFig. 1 , thesafety lock 26 is engaged with thetool body 14 to lock theoperating lever 24 from being pivoted toward thetool body 14. To drive thepolishing machine 10, anoperating part 26a of thesafety lock 26 is pushed forward to rotate thesafety lock 26 counterclockwise as seen in the figure so that thesafety lock 26 is disengaged from thetool body 14. Thereafter, theoperating lever 24 is pivoted toward thetool body 14. Consequently, avalve operating shaft 28 projecting from thetool body 14 is pushed in by theoperating lever 24, causing thevalve member 22 to be tilted. When thevalve member 22 is tilted, the sealing engagement between thevalve member 22 and thevalve seat 23 is canceled. As a result, the compressed-air supply path 20 which has been closed so far opens to allow compressed air to be supplied to thevane air motor 12. Thus, thevane air motor 12 is driven to rotate by the compressed air. Theabrasive holding member 18, which is drivably connected to arotary drive shaft 30 of thevane air motor 12, is retained by abearing 32 so that theabrasive holding member 18 is rotatable about an eccentric axis E which is eccentric with respect to a rotational center axis R of thevane air motor 12. In addition, asliding engagement projection 34 located on atop portion 18a of theabrasive holding member 18 is slidingly engaged by a sliding retainingportion 36 of thetool body 14 so that thesliding engagement projection 34 is allowed to move in a longitudinal direction (left-right direction as seen in the figure) but restrained from moving in a lateral direction (depth direction as seen in the figure). Accordingly, when thevane air motor 12 is driven to rotate, theabrasive holding member 18 is driven so that theabrasive material 16 attached to the distalend bottom surface 18b performs a reciprocating elliptical motion in a plane perpendicularly intersecting the rotational center axis R. Thepolishing machine 10 is an air tool configured to polish a member to be polished by pressing theabrasive material 16, which moves in a reciprocating elliptical motion as stated above, against the member to be polished. - The
vane air motor 12 disposed in thetool body 14 of thepolishing machine 10 has, as shown inFigs. 1 to 4 , ahousing 38 having arotor accommodating chamber 38b with a circular cylindrical innerperipheral surface 38a, arotor 40 rotatably retained in therotor accommodating chamber 38b, andvanes 42 slidably disposed in respective vaneaccommodating grooves 40a formed in therotor 40. A center axis C of the innerperipheral surface 38a, which defines therotor accommodating chamber 38b, and the rotational center axis R of therotor 40 are parallel to each other at respective positions eccentric with respect to each other (Figs. 2 and3 ). As shown inFig. 4 , there are four vaneaccommodating grooves 40a provided on an outerperipheral surface 40b of therotor 40, being equally spaced from each other in the circumferential direction of the outerperipheral surface 40b. Eachvane accommodating groove 40a extends on the outerperipheral surface 40b in parallel to the rotational center axis R of therotor 40 and also extends inward from the outerperipheral surface 40b toward the rotational center axis R. In addition, the outerperipheral surface 40b of therotor 40 is provided with cut-outportions 44 for promoting vane pushing-out action at the opposite ends of eachvane accommodating groove 40a. The cut-outportions 44 intersect the associatedvane accommodating groove 40a at a predetermined depth from the outerperipheral surface 40b. More specifically, each cut-outportion 44 has a cut plane perpendicularly intersecting the associatedvane accommodating groove 40a over a length approximately equal to one-fifth of the length of therotor 40 in the direction of the rotational center axis R. The cut-outportions 44 are provided only at the rear side of eachvane accommodating groove 40a as viewed in the rotational direction of therotor 40 when driven to rotate (i.e. only at the upstream side of the flow of compressed air). Thevane 42 disposed in eachvane accommodating groove 40a has anouter surface 42a facing radially outward of therotor 40, and aninner surface 42b facing radially inward of therotor 40, and is radially slidable between a position where thevane 42 is pushed into thevane accommodating groove 40a by the innerperipheral surface 38a of therotor accommodating chamber 38b, as in the case of thevane 42 located at the upper position as seen inFig. 2 , and a position where thevane 42 is projected from thevane accommodating groove 40a outward of the outerperipheral surface 40b of therotor 40 to contact the innerperipheral surface 38a of thehousing 38 by the centrifugal force due to the rotation of therotor 40, as in the case of theother vanes 42 inFig. 2 . Thehousing 38 is provided with anair supply port 38c (Fig. 2 ) opening on the innerperipheral surface 38a at a central position in the axial direction thereof to receive compressed air, andair discharge ports 38d (Fig. 3 ) opening on the innerperipheral surface 38a at respective positions near the axially opposite ends of thehousing 38 to discharge compressed air, so that compressed air supplied from the compressed-air supply path 20 through theair supply port 38c flows in one direction (clockwise as seen inFigs. 2 and3 ) through aspace 46 between the innerperipheral surface 38a of thehousing 38 and the outerperipheral surface 40b of therotor 40 and flows out of thevane air motor 12 from theair discharge ports 38d before being discharged through a compressed-air discharge path 48. In the process of flowing through thehousing 38 from theair supply port 38c toward theair discharge ports 38d, compressed air collides against side surfaces 42c of thevanes 42 projecting outward from thevane accommodating grooves 40a of therotor 40 and pushes thesevanes 42, thereby driving therotor 40 to rotate. - Table 1 below shows the results of an experiment carried out to compare between a grinding machine having a conventional vane air motor and a grinding machine having the
vane air motor 12 of the present invention in terms of the frequency of occurrence of a start-up failure in each of the grinding machines at various pressures of compressed air used. The experiment was carried out by repeating start and stop operations 100 times for each grinding machine having the above-described vane air motor and counting the number of times at which the vane air motor failed to start. The grinding machines used in the experiment were the same except that one vane air motor had the cut-outportions 44 and the other vane air motor had no cut-outportions 44. As will be understood from Table 1, the grinding machine having thevane air motor 12 according to the present invention showed a great improvement in the start-up failure rate over the grinding machine having the conventional vane air motor at any air pressure.[Table 1] Air pressure [MPa] Number of times of start-up failure (out of 100) Conventional vane air motor (without cut-out portions) Vane air motor of present invention (with cut-out portions) 0.1 54 4 0.2 37 3 0.3 12 1 0.6 3 0 - In a
vane air motor 112 according to another embodiment, as shown inFig. 5 , cut-outportions 144 provided in arotor 140 are disposed so that each cut-outportion 144 intersects the central position of the associatedvane accommodating groove 140a. The cut-outportion 144 forms an arcuate surface gradually becoming shallower as the distance from the center of therotor 140 in the direction of the rotational center axis R increases toward the opposite ends of therotor 140. It should be noted that the cut-outportion 144 is configured not to intersect either of the opposite end portions of thevane accommodating groove 140a. - In a
vane air motor 212 according to still another embodiment, as shown inFig. 6 , cut-outportions 244 provided in arotor 240 are formed as grooves of rectangular section extending in the circumferential direction of an outerperipheral surface 240b of therotor 240. The groove-shaped cut-outportions 244 are provided to extend circumferentially and contiguously around the outerperipheral surface 240b of therotor 240 while crossingvane accommodating grooves 240a. In addition, the cut-outportions 244 are provided such that three groove-shaped cut-out portions extend parallel to each other and are equally spaced from each other in the direction of the rotational center axis R of therotor 240. - We carried out an experiment to compare between a grinding machine which was different from that used in the experiment shown in Table 1 above and which had a conventional vane air motor without cut-out portions and grinding machines respectively having the
vane air motors Figs. 4 to 6 in terms of the frequency of occurrence of a start-up failure in the grinding machines. As a result, with the conventional vane air motor, the start-up failure occurred 28 times out of 100 trials. In contrast, with thevane air motor 12, shown inFig. 4 , the start-up failure occurred 2 times out of 100 trials. With thevane air motor 112, shown inFig. 5 , the start-up failure occurred 16 times out of 100 trials, and with thevane air motor 212, shown inFig. 6 , the start-up failure occurred 2 times out of 100 trials. In other words, thevane air motors vane air motor 12, shown inFig. 4 , which has the cut-outportions 44 provided at both ends of therotor 40, and thevane air motor 212, shown inFig. 6 , which has the cut-outportions 244 provided in the form of three grooves extending in the circumferential direction of therotor 240. All the vane air motors used in this experiment had a structure in which theair supply port 38c is provided at a central position in the axial direction of thehousing 38, and theair discharge ports 38d are provided at respective positions near the axially opposite ends of thehousing 38. - In the
vane air motors portions peripheral surfaces rotors vane accommodating grooves vane accommodating grooves vane accommodating grooves vanes vanes vanes rotors vane air motors vanes vane accommodating grooves vanes - Although in the above-described embodiments, the
vane accommodating grooves rotors vane accommodating grooves vane accommodating grooves vanes machine 10, in which a driven part that is driven by thevane air motor member 18, as one embodiment of an air tool having thevane air motor - Polishing
machine 10;vane air motor 12;tool body 14;rear end 14a;abrasive material 16; abrasive holdingmember 18;top portion 18a; distal endbottom surface 18b; compressed-air supply path 20;valve member 22;valve seat 23; operatinglever 24;safety lock 26; operatingpart 26a;valve operating shaft 28;rotary drive shaft 30; bearing 32; slidingengagement projection 34; sliding retainingportion 36;housing 38; innerperipheral surface 38a;rotor accommodating chamber 38b;air supply port 38c;air discharge ports 38d;rotor 40;vane accommodating grooves 40a; outerperipheral surface 40b;vanes 42;outer surface 42a;inner surface 42b;side surfaces 42c; cut-outportions 44;space 46; compressed-air discharge path 48;vane air motor 112;rotor 140;vane accommodating grooves 140a;vanes 142; cut-outportions 144;vane air motor 212;rotor 240;vane accommodating grooves 240a; outerperipheral surface 240b;vanes 242; cut-outportions 244; rotational center axis R; eccentric axis E; center axis C.
Claims (5)
- A vane air motor (12) comprising:a housing (38) having a rotor accommodating chamber (38b) with a circular cylindrical inner peripheral surface (38a);a rotor (40) retained in the rotor accommodating chamber (38b) rotatably about a rotational center axis parallel to a center axis of the inner peripheral surface (38a), the rotor (40) having a vane accommodating groove (40a) defined by an elongated opening formed on an outer peripheral surface (40b) of the rotor (40) to extend parallel to the rotational center axis, the vane accommodating groove (40a) being further defined by a front side surface and a rear side surface which extend radially inward from a front edge and a rear edge, respectively, of the opening, as viewed in a rotational direction of the rotor (40), and a bottom surface extending between the front side surface and the rear side surface at a position spaced radially inward from the outer peripheral surface of the rotor (40); anda vane (42) slidably disposed in the vane accommodating groove;wherein compressed air is supplied from an air supply port (38c) opening on the inner peripheral surface (38a) and passed around the rotor (40) in one direction before being discharged from an air discharge port located at a position circumferentially spaced from the air supply port (38c), so that the compressed air acts on the vane to rotationally drive the rotor (40);wherein the air supply port (38c) is provided at a central position of the inner peripheral surface (38a) in a direction of the center axis;the rotor having cut-out portions (44) for promoting vane pushing-out action which are provided on the outer peripheral surface (40b) to intersect the vane accommodating groove (40a) at a position spaced from the bottom surface of the vane accommodating groove(40a),characterised by
the cut-out portions (44) being defined by cut-out surfaces extending rearward in the rotational direction from the rear side surface of the vane accommodating groove (40a) to intersect the outer peripheral surface (40b) at opposite ends, respectively, of the vane accommodating groove (40a) of the rotor (40) in the direction of the rotational center axis, the cut-out portions (44) for promoting vane pushing-out action provided only at a rear side of the vane accommodating groove (40a). - The vane air motor of claim 1, wherein the cut-out surfaces defining the cut-out portion (44) for promoting vane pushing-out action intersect the end surfaces, respectively, of the rotor (40).
- The vane air motor of claim 1, wherein the cut-out surfaces defining the cut-out portion (44) for promoting vane pushing-out action perpendicularly intersect the rear side surface of the vane accommodating groove (40).
- The vane air motor of any one of claims 1 to 3, wherein the cut-out surfaces defining the cut-out portion (44) for promoting vane pushing-out action each intersect the vane accommodating groove (40c) over a width approximately equal to one-fifth of a length of the rotor (40) in the direction of the axis.
- An air tool comprising:the vane air motor of any one of claims 1 to 4;a tool body retaining the vane air motor (12); anda driven part drivably connected to the vane air motor (12).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2014242287A JP6420644B2 (en) | 2014-11-28 | 2014-11-28 | Vane type air motor and air tool equipped with vane type air motor |
PCT/JP2015/083256 WO2016084906A1 (en) | 2014-11-28 | 2015-11-26 | Vane-type air motor and air tool provided with vane-type air motor |
Publications (3)
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EP3184733A1 EP3184733A1 (en) | 2017-06-28 |
EP3184733A4 EP3184733A4 (en) | 2018-04-18 |
EP3184733B1 true EP3184733B1 (en) | 2019-10-23 |
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EP15863474.1A Active EP3184733B1 (en) | 2014-11-28 | 2015-11-26 | Vane-type air motor and air tool provided with vane-type air motor |
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EP (1) | EP3184733B1 (en) |
JP (1) | JP6420644B2 (en) |
KR (2) | KR20170042342A (en) |
CN (1) | CN106715832B (en) |
AU (1) | AU2015354583B2 (en) |
TW (1) | TWI566886B (en) |
WO (1) | WO2016084906A1 (en) |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
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WO2019132786A1 (en) * | 2017-12-28 | 2019-07-04 | Altunzade Emirhan | Pneumatic and electro-pneumatic automobile and all purpose hybrid engine |
CN109514432A (en) * | 2018-11-12 | 2019-03-26 | 苏州丰川电子科技有限公司 | Grinding head for metal parts processing |
CN109352514A (en) * | 2018-11-15 | 2019-02-19 | 苏州丰川电子科技有限公司 | Grinding head is used in metal surface processing |
CN109531410A (en) * | 2018-11-15 | 2019-03-29 | 苏州丰川电子科技有限公司 | High-precision grinding head |
CN109500727A (en) * | 2018-11-15 | 2019-03-22 | 苏州丰川电子科技有限公司 | Wear-resistant grinding head |
CN109623566A (en) * | 2018-12-10 | 2019-04-16 | 苏州丰川电子科技有限公司 | Processing integrated machine for notebook computer shell |
CN110359962B (en) * | 2019-07-17 | 2021-01-05 | 顾新钿 | Pneumatic motor |
EP3839207A1 (en) * | 2019-12-20 | 2021-06-23 | EXDL Co., Ltd. | Vane motor |
KR102428799B1 (en) * | 2020-11-30 | 2022-08-04 | 이엑스디엘 주식회사 | vane motor |
KR102491034B1 (en) * | 2021-02-19 | 2023-01-26 | 이엑스디엘 주식회사 | vane motor |
KR102491035B1 (en) * | 2021-03-15 | 2023-01-26 | 이엑스디엘 주식회사 | vane motor |
CN114320476B (en) * | 2022-01-05 | 2023-04-21 | 苏州明志科技股份有限公司 | Vane type pneumatic motor |
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US7040101B2 (en) * | 2000-08-28 | 2006-05-09 | Sharp Kabushiki Kaisha | Air refining device and ion generator used for the device |
EP1747348B1 (en) * | 2004-04-30 | 2016-08-31 | DePuy Synthes Products, Inc. | Surgical pneumatic motor |
US7255546B1 (en) * | 2004-04-30 | 2007-08-14 | The Anspach Effort, Inc. | Spindle for a vane motor |
WO2008095129A2 (en) * | 2007-01-31 | 2008-08-07 | Turbodyne Technologies, Inc. | Generation and management of mass air flow |
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JP4964254B2 (en) * | 2009-01-08 | 2012-06-27 | 日東工器株式会社 | Vane type air motor |
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WO2012037580A2 (en) * | 2010-09-13 | 2012-03-22 | Graco Minnesota Inc. | Rotary air motor locking assembly |
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-
2014
- 2014-11-28 JP JP2014242287A patent/JP6420644B2/en active Active
-
2015
- 2015-11-25 TW TW104139188A patent/TWI566886B/en active
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- 2015-11-26 AU AU2015354583A patent/AU2015354583B2/en active Active
- 2015-11-26 WO PCT/JP2015/083256 patent/WO2016084906A1/en active Application Filing
- 2015-11-26 CN CN201580050595.4A patent/CN106715832B/en active Active
- 2015-11-26 KR KR1020197022722A patent/KR20190093700A/en not_active Application Discontinuation
- 2015-11-26 EP EP15863474.1A patent/EP3184733B1/en active Active
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Also Published As
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TWI566886B (en) | 2017-01-21 |
JP6420644B2 (en) | 2018-11-07 |
AU2015354583A1 (en) | 2017-03-09 |
CN106715832A (en) | 2017-05-24 |
JP2016102472A (en) | 2016-06-02 |
KR20190093700A (en) | 2019-08-09 |
CN106715832B (en) | 2019-05-28 |
AU2015354583B2 (en) | 2019-03-07 |
WO2016084906A1 (en) | 2016-06-02 |
TW201630688A (en) | 2016-09-01 |
KR20170042342A (en) | 2017-04-18 |
EP3184733A1 (en) | 2017-06-28 |
EP3184733A4 (en) | 2018-04-18 |
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