WO2019097733A1 - Speed governor for air motor, and air tool - Google Patents

Speed governor for air motor, and air tool Download PDF

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Publication number
WO2019097733A1
WO2019097733A1 PCT/JP2017/042791 JP2017042791W WO2019097733A1 WO 2019097733 A1 WO2019097733 A1 WO 2019097733A1 JP 2017042791 W JP2017042791 W JP 2017042791W WO 2019097733 A1 WO2019097733 A1 WO 2019097733A1
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WO
WIPO (PCT)
Prior art keywords
governor
air motor
valve
stopper
rod
Prior art date
Application number
PCT/JP2017/042791
Other languages
French (fr)
Japanese (ja)
Inventor
悟 高村
道輝 橋本
Original Assignee
ヨコタ工業株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ヨコタ工業株式会社 filed Critical ヨコタ工業株式会社
Priority to CN201780094804.4A priority Critical patent/CN111344113B/en
Publication of WO2019097733A1 publication Critical patent/WO2019097733A1/en
Priority to PH12020550659A priority patent/PH12020550659A1/en

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    • 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

Definitions

  • the present invention relates to an air motor governor which regulates the rotational speed of an air motor, and an air tool provided with such a governor.
  • Air motors are commonly used as a drive source for air tools such as air grinders and air sanders.
  • the air tool generally includes a governor that regulates the rotational speed of the air motor.
  • Patent Document 1 describes an air tool provided with an air motor and a governor.
  • the speed governor when the rotational speed of the air motor reaches a certain speed or more, the speed governor does not exceed the allowable speed determined in consideration of safety. Reduce the supply flow rate of compressed air. That is, in the air tool described in Patent Document 1, the governor operates to limit the maximum speed of the air motor.
  • the present invention has been made in view of the above problems, and an object thereof is to provide an air motor governor and an air tool capable of easily resetting the maximum speed of the air motor.
  • the air motor speed governor disclosed in the present application is an air motor speed governor that adjusts the rotational speed of the air motor, and includes a governor rod, a governor valve, biasing means, pressing means, and adjusting means.
  • the governor rod rotates integrally with the rotation shaft of the air motor.
  • the governor valve is movably provided along the axial direction of the governor rod to increase or decrease the supply flow rate of compressed gas to the air motor.
  • the biasing means is disposed in the axial direction, contacts with the governor valve at one end in the axial direction, and biases the governor valve in a valve opening direction in which the supply flow rate increases.
  • the pressing means generates a resistance that increases as the rotational speed of the air motor increases, and the valve closing direction in which the supply flow rate decreases against the biasing force of the biasing unit biasing the governor valve. Press the governor valve.
  • the adjusting means adjusts the biasing force.
  • the adjustment means includes a stopper and positioning means.
  • the stopper is provided so as to be movable along the axial direction of the governor rod, and abuts on the other axial end of the biasing means.
  • the positioning means is mounted on the governor rod, engages with the stopper, and positions the stopper at a predetermined position in the axial direction.
  • the stopper is a plurality of engaged portions engaged with the positioning means, and has a plurality of engaged portions different in axial position.
  • the stopper is provided coaxially with the governor rod, is rotatable relative to the governor rod about the axial center of the governor rod, and the plurality of engaged engagements The portions are disposed along a circle concentric with the axis of the governor rod.
  • the stopper has an end surface portion facing in the valve closing direction.
  • the plurality of engaged portions are bottom portions of a plurality of grooves formed in the end surface portion and having different axial depths.
  • the air tool disclosed in the present application includes an air motor and the speed controller of the air motor described above.
  • the air tool may be an air grinder, an air sander or an air polisher.
  • the speed controller of the air motor and the air tool of the present invention since the biasing force of the biasing means can be adjusted by the adjusting means, the maximum speed of the air motor can be easily reset.
  • FIG. 5 (b) is a sectional view taken along line AA in FIG.
  • the air tool in the present embodiment is an air grinder
  • the air grinder is an air motor 10, a governor 20 for adjusting the rotation speed of the air motor 10, and a polishing machine for rotating the rotation of the air motor 10.
  • a transmission mechanism 30 for transmitting information to T.40.
  • the air motor 10 is supplied with the compressed gas PG from a compressor (not shown) and is driven by the compressed gas PG.
  • the compressed gas PG is, for example, compressed air.
  • the air motor 10 has a rotor 11 and a cylindrical housing 15 that accommodates the rotor 11.
  • the housing 15 has two end plates 15a.
  • the rotor 11 is rotated at a rotational speed corresponding to the supply flow rate Q of the compressed gas PG to the air motor 10.
  • the rotational speed of the air motor 10 corresponds to the rotational speed of the rotor 11.
  • the compressed gas PG is fed to the air grinder through a feed pipe such as a compressed air hose (not shown) and introduced into the gas introduction space 60 through the introduction path 50.
  • a governor 20 is accommodated in the gas introduction space 60.
  • an opening 51 communicating the introduction path 50 with the gas introduction space 60 is formed in the peripheral wall 61 of the gas introduction space 60.
  • the compressed gas PG introduced into the gas introduction space 60 is supplied to the air motor 10 through a supply path (not shown).
  • a well-known vane type air motor can be used as the air motor 10.
  • the rotor 11 is integrally formed with the left rotation shaft 12 and the right rotation shaft 13 so as to project from both left and right ends.
  • the left rotation shaft 12 and the right rotation shaft 13 are supported by the two end plates 15 a of the housing 15 via two radial bearings 14.
  • the left rotation shaft 12 is an output shaft and is connected to the transmission mechanism 30.
  • the right side rotation shaft 13 is connected to the governor 20.
  • the transmission mechanism 30 transmits the rotation output of the air motor output from the left rotation shaft 12 to the polishing disk 40.
  • the polishing disc 40 rotates at a rotational speed corresponding to the rotational speed of the air motor 10.
  • the speed governor 20 has a governor rod 21, a governor valve 22, a spring 23, a governor body 24, a plurality of steel balls 25, a stopper 26, and a pin 27.
  • the governor rod 21 is connected to the right rotation shaft 13 so as to rotate integrally with the right rotation shaft 13.
  • the governor valve 22 is provided so as to be movable along the axial direction X of the governor rod 21, and increases or decreases the supply flow rate Q of the compressed gas PG to the air motor 10.
  • the governor valve 22 is a cylindrical member provided coaxially with the governor rod 21.
  • the governor valve 22 has a constant diameter portion 22a disposed on the distal end side (right side in FIG. 2) of the governor rod 21 and an enlarged diameter portion 22b disposed on the proximal end side (left side in FIG. 2) of the governor rod 21.
  • the enlarged diameter portion 22 b is continuous with the left end portion of the constant diameter portion 22 a, and is formed to increase in diameter in a skirt shape toward the proximal end side of the governor rod 21.
  • the constant diameter portion 22a has an axial hole 22c through which the governor rod 21 is inserted.
  • the governor valve 22 is movable in the axial direction X with respect to the governor rod 21 in a state where the governor rod 21 is inserted into the shaft hole 22c.
  • a pair of long holes 22 d is formed in the axial direction X in the peripheral wall of the constant diameter portion 22 a so as to penetrate the peripheral wall.
  • the pair of elongated holes 22 d are opposed to each other with the axial center of the governor rod 21 interposed therebetween.
  • the spring 23 is disposed in the axial direction X, and one end in the axial direction X abuts on the governor valve 22 to bias the governor valve 22 in the valve opening direction X1 in which the supply flow rate Q increases.
  • One end of the spring 23 in the axial direction X is the end on the proximal end side of the governor rod 21 among both ends in the axial direction X, and is the left end in FIG.
  • the spring 23 in this embodiment corresponds to the biasing means in the claims.
  • the governor body 24 is a circular member coaxial with the governor rod 21 and disposed on the proximal end side of the governor rod 21 with respect to the governor valve 22, and is fixed to the governor rod 21. Further, the governor body 24 has an abutted portion 24 a with which the governor valve 22 abuts, and an annular slope portion 24 b.
  • the governor valve 22 is restricted in movement of the governor rod 21 to the proximal end side by being abutted against the abutted portion 24 a.
  • the sloped portion 24b is inclined with respect to the axial direction X such that the radially outer portion is located closer to the tip end of the governor rod 21 than the inner portion.
  • the plurality of steel balls 25 are disposed between the governor valve 22 and the governor body 24, and can be in contact with the inclined surface 24b and the inner side surface of the enlarged diameter portion 22b. As will be described in detail later, the plurality of steel balls 25 cooperate with the governor body 24 to generate a resistance AF which increases as the rotational speed of the air motor 10 increases, and the spring 23 mounts the governor valve 22.
  • the governor valve 22 is pressed in the valve closing direction X2 in which the supply flow rate Q decreases, against the biasing force F that is biased.
  • the governor body 24 and the steel ball 25 in the present embodiment correspond to the pressing means in the claims.
  • the pressing means is provided coaxially with the governor rod 21 and has a governor body 24 disposed on the proximal end side of the governor rod 21 with respect to the governor valve 22 and a plurality of steel balls 25. And the plurality of steel balls 25 are in contact with the sloped portion 24b and the governor valve 22 so that the outer portion of the rod is positioned closer to the tip end side of the governor rod 21 than the inner portion. It is arranged between the governor valve 22 and the governor body 24 as possible.
  • the stopper 26 is provided movably along the axial direction X, and abuts on the other end of the spring 23 in the axial direction X.
  • the other end of the spring 23 in the axial direction X is the tip end of the governor rod 21 at both ends in the axial direction X, and is the right end in FIG.
  • the stopper 26 is provided coaxially with the governor rod 21, and is rotatable relative to the governor rod 21 about the axial center of the governor rod 21. More specifically, the stopper 26 is an annular member having a hollow portion. The stopper 26 is movable along the axial direction X by inserting the constant diameter portion 22a of the governor valve 22 into the hollow portion and slidingly contacting the constant diameter portion 22a on the inner peripheral surface thereof. The details of the stopper 26 will be described later with reference to FIGS. 4 and 5.
  • the pin 27 is mounted on the governor rod 21 and engages with the stopper 26 to position the stopper 26 at a predetermined position in the axial direction X.
  • the pin 27 is a cylindrical member and is inserted into the lateral hole 21 a of the governor rod 21.
  • the lateral hole 21 a is formed in the vicinity of the tip end portion of the governor rod 21, and penetrates the governor rod 21 so as to be orthogonal to the central axis of the governor rod 21. Both ends of the pin 27 protrude to the outside of the governor valve 22 through the two elongated holes 22 d.
  • the stopper 26 is engaged with both ends of the pin 27 to restrict the movement of the governor rod 21 toward the tip end, and is positioned at a predetermined position in the axial direction X with respect to the governor rod 21. That is, the pin 27 engages with the stopper 26 and regulates the movement of the stopper 26 in the valve closing direction X2, that is, the movement of the stopper 26 to the tip end side of the governor rod 21.
  • the pin 27 in this embodiment corresponds to the positioning means in the claims. As described above, the pin 27 is inserted into the pair of long holes 22d. The elongated hole 22 d in the axial direction X enables the governor valve 22 to move in the axial direction X with respect to the pin 27. Further, the relative rotation of the governor valve 22 with respect to the governor rod 21 is restricted by inserting the pin 27 into the pair of elongated holes 22 d.
  • FIG. 3A shows the governor 20 when the air motor 10 is not rotating.
  • the opening 51 of the introduction path 50 is opposed to the one end 22 e of the governor valve 22.
  • the one end 22 e of the governor valve 22 is the tip end of the governor rod 21 among the two ends in the axial direction X of the governor valve 22.
  • the governor valve 22 abuts on the governor body 24 by the biasing force of the spring 23.
  • the governor valve 22 is in contact with the governor body 24, the distance between the one end 22e of the governor valve 22 and the opening 51 is maximized.
  • the compressed gas PQ is more easily introduced into the gas introduction space 60, and the supply flow rate Q increases.
  • FIG. 3 (b) shows the governor 20 when the air motor 10 is rotating.
  • the steel balls 25 move radially outward due to the centrifugal force.
  • the steel ball 25 moves to the tip end side of the governor rod 21 along the slope portion 24 b.
  • the steel ball 25 presses the governor valve 22 to the tip side of the governor rod 21 against the biasing force F of the spring 23.
  • the reaction force AF that the steel ball 25 presses the governor valve 22 increases as the rotational speed of the air motor 10 increases.
  • the reaction force AF exceeds the biasing force F of the spring 23
  • the governor valve 22 moves to the tip end side of the governor rod 21.
  • the supply flow rate Q decreases.
  • the amount of decrease of the supply flow rate Q increases as the rotational speed of the air motor 10 increases.
  • the maximum speed of the air motor 10 is limited, and the supply flow rate Q is adjusted so that the rotational speed of the air motor 10 does not exceed the allowable speed determined in consideration of safety.
  • the stopper 26 has a plurality of engaged portions 28 engaged with the pins 27.
  • the positions of the plurality of engaged portions 28 in the axial direction X are different from each other.
  • the stopper 26 is provided coaxially with the governor rod 21, and is rotatable relative to the governor rod 21 about the axial center of the governor rod 21.
  • the plurality of engaged portions 28 are disposed along a circle concentric with the axial center of the governor rod 21. More specifically, the stopper 26 has a first end face 26a facing in the valve opening direction X1 and a second end face 26b facing in the valve closing direction X2.
  • the first end face 26 a and the second end face 26 b are orthogonal to the axial center of the governor rod 21.
  • the other end of the spring 23 in the axial direction X abuts on the first end face portion 26 a.
  • a plurality of grooves 29 are formed in the second end face portion 26b.
  • the ends of the pins 27 fit into the plurality of grooves 29.
  • the bottom of the groove 29 is engaged with the pin 27. That is, the plurality of engaged portions 28 are bottoms of the plurality of grooves 29.
  • the second end face portion 26 b in the present embodiment corresponds to the “end face portion” in the claims.
  • the plurality of grooves 29 are formed in the second end face portion 26 b so as to extend in the radial direction of the stopper 26, and the inner ends of the both ends in the radial direction are opened toward the hollow portion of the stopper 26. doing. Further, a plurality of marks 26 c are provided in the second end face portion 26 b in correspondence to the plurality of grooves 29.
  • the second end face 26 b includes a first groove 29 1 , a second groove 29 2 , a third groove 29 3 , and a fourth groove 29 4 as the plurality of grooves 29. It is formed.
  • Each of the first groove 29 1 , the second groove 29 2 , the third groove 29 3 , and the fourth groove 29 4 is formed two by two in the second end face portion 26 b.
  • a first groove 29 1 of the depth L1, a second groove 29 second depth L2, the depth L3 of the third groove 29 3, the depth L4 of the fourth groove 29 4 are different from each other.
  • the depth L1 of the first groove 29 1 is less than the second groove 29 second depth L2, the second grooves 29 and second depth L2 smaller than the depth L3 of the third groove 29 3, the 3 groove 29 third depth L3 is smaller than the fourth groove 29 fourth depth L4. That is, depth L1 ⁇ depth L2 ⁇ depth L3 ⁇ depth L4.
  • the first engaged portion 28 as a plurality of engaged portions 28 1, the second engaged portion 28 2, third engaged portion 28 3, the fourth engagement portion 28 4, the first groove 29 1, second groove 29 2, third groove 29 3, a bottom of the fourth groove 29 4 are provided two on the stopper 26.
  • the first engaged portion 28 1 is positioned on the distal end side of the second engaged portion 28 2 than Gabanaroddo 21.
  • the second engaged portion 28 2 is located on the distal end side of the Gabanaroddo 21 than the third engaged portion 28 3.
  • the depth L3 ⁇ depth L4 in the axial direction X the third engaged portion 28 3 is positioned on the distal end side of the Gabanaroddo 21 than the fourth engagement portion 28 4.
  • the plurality of marks 26 c include one or more projections, and the grooves are any of the first groove 29 1 , the second groove 29 2 , the third groove 29 3 , and the fourth groove 29 4 according to the number of the projections. Can be identified. Therefore, for example, each groove can be identified by touching with a finger even in an environment where the light amount is not sufficient.
  • FIG. 6 (a) is a pin 27, shows the speed governor 20 when engaged with the first engaged portion 28 1.
  • the length of the spring 23 indicated as “length L11 ', the urging force of the spring 23 indicated as” biasing force F1', the stopper 26 The predetermined position to be positioned is referred to as "position P1".
  • FIG. 6 (b) is a pin 27, shows the speed governor 20 when engaged with the fourth engagement portion 28 4.
  • the length of the spring 23 indicated as “length L12 ', the urging force of the spring 23 indicated as” biasing force F2', the stopper 26 The predetermined position to be positioned is referred to as "position P2".
  • position P2 In FIG. 6A and FIG. 6B, the air motor 10 is not rotating. Further, the position P1 and the position P2 are determined based on the position of the first end face portion 26a.
  • the position P1 of the stopper 26 when the first engaged portion 28 1 a pin 27 is engaged the fourth engagement portion 28 4 Is positioned on the proximal end side of the governor rod 21 from the position P2 of the stopper 26 when the pin 27 is engaged, and the length L11 is shorter than the length L12.
  • the biasing force F1 becomes larger than the biasing force F2. That is, from when the person when the first engaged portion 28 1 a pin 27 is engaged pin 27 is engaged with the fourth engagement portion 28 4, the attachment of the spring 23 load (initial The load) increases.
  • the governor valve 22 is less likely to move in the valve closing direction X2 even if the rotational speed of the air motor is increased. Therefore, from when the person when the first engaged portion 28 1 a pin 27 is engaged pin 27 is engaged with the fourth engagement portion 28 4, the maximum speed of the air motor is increased . As described above, the maximum speed of the air motor is reset.
  • valve opening direction stopper 26 against the elastic force of the spring 23 pushing the X1, to release the engagement between the pin 27 and the first engaged portion 28 1.
  • the stopper 26 is rotated to a position where both ends of the pin 27 is fitted into two of the fourth groove 29 4, loosen the force to push the stopper 26 in the valve opening direction X1, pin 27 and the fourth engagement portion 28 4 And engage.
  • the speed governor 20 includes the mechanism (the stopper 26 and the pin 27) for adjusting the biasing force of the spring 23. Therefore, the maximum speed of the air motor can be easily reset.
  • the urging force of the spring 23 can be changed by a simple operation of pushing the stopper 26 in the valve opening direction X1 and rotating the stopper 26. Therefore, the maximum speed of the air motor can be easily reset again without performing a complicated operation such as disassembling the governor 20, for example.
  • the position in the axial direction X at which the stopper 26 is positioned is stepwise You can change it. Since the position of the stopper 26 can be changed stepwise, the maximum speed of the air motor 10 can be set to the desired maximum speed without requiring a high level of learning. For example, in a mechanism that changes the position of the stopper 26 steplessly in the form of a screw, the user can sufficiently set the relationship between the operation amount (screw rotation amount), the displacement amount of the stopper 26 and the change amount of the maximum speed. Until grasped, the maximum speed of the air motor 10 can not be set to the desired maximum speed in a few trials. That is, in the stepless mechanism, a high level of skill is required to set the maximum speed of the air motor 10 to the desired maximum speed.
  • the stopper 26 has the plurality of engaged portions 28 in which the positions in the axial direction X are different from each other. Therefore, the biasing force of the spring 23 can be adjusted simply by switching the engaged portion 28 engaged with the pin 27, and the maximum speed of the air motor can be easily reset.
  • the stopper 26 is rotatable relative to the governor rod 22 centering on the axial center of the governor rod 22, and the plurality of engaged portions 28 are formed in a circle concentric with the axis of the governor rod. Arranged along. Therefore, only by rotating the stopper 26, the engaged portion 28 engaged with the pin 27 can be switched, and the maximum speed of the air motor can be easily reset.
  • the plurality of engaged portions 28 are bottom portions of the plurality of grooves 29 formed in the second end face portion 26 b and having different depths in the axial direction X from each other. Therefore, when the stopper 26 is rotated with the governor rod 21 by the rotation of the air motor 10, the engaged portion 28 engaged with the pin 27 is not switched freely, and the setting of the maximum speed of the air motor 10 can be stably maintained. For example, in a mechanism that changes the position of the stopper 26 steplessly in a screw manner, it is also conceivable that the stopper 26 rotates relative to the governor rod 21 when the stopper 26 rotates with the governor rod 21 by the rotation of the air motor 10.
  • the biasing force of the spring 23 is adjusted by the engagement between the plurality of engaged portions 28 and the pins 27.
  • the biasing force may be adjusted by, for example, sandwiching shims of various thicknesses between the governor valve 22 and the spring 23.
  • sandwiching shims of various thicknesses between the governor valve 22 and the spring 23.
  • the spring 23 has a male screw formed on the outer peripheral surface on the tip end side of the governor valve 22 and a female screw formed on the inner peripheral surface of the stopper 26.
  • the biasing force is adjusted steplessly by screwing the male screw and the female screw. May be However, in this configuration, as described above, it takes a high degree of learning to set the maximum speed of the air motor to the desired maximum speed. Further, as described above, it is also conceivable that the stopper 26 rotates with respect to the governor rod 21 when the stopper 26 rotates with the governor rod 21 by the rotation of the air motor 10.
  • the governor 20 is provided in an air grinder as a kind of air tool, but the invention is not limited thereto.
  • the governor according to the present invention may be provided in any machine as long as it is an air motor as a drive source.
  • the air tool is not limited to the air grinder, and may be an air sander or an air polisher.
  • the plurality of marks 26 c include one or more protrusions, but is not limited thereto.
  • the plurality of marks 26c may be any as long as they can indicate differences in the plurality of grooves 29, and may include numbers, letters, and symbols. Alternatively, the plurality of marks 26c may include one or more recesses.

Abstract

A speed governor (20) for an air motor (10) adjusts the rotational speed of the air motor. The speed governor (20) is provided with a governor rod (21), a governor valve (22), a biasing means (23), pressing means (24, 25), and adjusting means (26, 27). The governor valve is provided in such a manner as to be movable along the axis of the governor rod, and increases or decreases the flow rate of a compressed gas to be supplied to the air motor. The biasing means abuts the governor valve at one axial end part thereof, and biases the governor valve in the valve opening direction in which the supply flow rate increases. The pressing means generate a drag force which increases as the rotational speed of the air motor increases, and press, against the biasing force of the biasing means biasing the governor valve, the governor valve in the valve closing direction in which the supply flow rate decreases. The adjusting means adjust the biasing force. As a result, the maximum speed of the air motor can be easily reset.

Description

エアモータの調速機、及びエアツールAir motor governor and air tool
　本発明は、エアモータの回転速度を調節する、エアモータの調速機、及びそのような調速機を備えたエアツールに関するものである。 The present invention relates to an air motor governor which regulates the rotational speed of an air motor, and an air tool provided with such a governor.
　エアモータは、エアグラインダ及びエアサンダなどのエアツールの駆動源として一般に使用されている。エアツールは、エアモータの回転速度を調節する調速機を一般に備えている。例えば、特許文献１には、エアモータと調速機とを備えたエアツールが記載されている。特許文献１に記載のエアツールにおいては、調速機は、エアモータの回転速度がある程度以上の速度に達すると、エアモータの回転速度が安全性を考慮して決められる許容速度を超えないようにエアモータに対する圧縮空気の供給流量を減少する。つまり、特許文献１に記載のエアツールにおいては、調速機は、エアモータの最高速度を制限するように動作する。 Air motors are commonly used as a drive source for air tools such as air grinders and air sanders. The air tool generally includes a governor that regulates the rotational speed of the air motor. For example, Patent Document 1 describes an air tool provided with an air motor and a governor. In the air tool described in Patent Document 1, when the rotational speed of the air motor reaches a certain speed or more, the speed governor does not exceed the allowable speed determined in consideration of safety. Reduce the supply flow rate of compressed air. That is, in the air tool described in Patent Document 1, the governor operates to limit the maximum speed of the air motor.
特表２０１１－５０８１３６号公報JP 2011-508136 gazette
　しかしながら、特許文献１に記載のエアツールにおいては、例えば圧縮空気の供給圧力が高くなると、圧縮空気の供給流量が増大し、調速機によって制限されるエアモータの最高速度は高速側に遷移する。また、エアモータに個体差があれば、圧縮空気の供給圧力が一定であっても、調速機によって制限されるエアモータの最高速度が高速側に遷移することも考えられる。従って、特許文献１に記載のエアツールにおいては、エアモータの回転速度が許容速度を超えないように、最高速度の設定値を低めに設定するなどの配慮が必要となり、製品設計の自由度が低減される。 However, in the air tool described in Patent Document 1, for example, when the supply pressure of the compressed air increases, the supply flow rate of the compressed air increases, and the maximum speed of the air motor limited by the governor changes to the high speed side. In addition, if there are individual differences in the air motor, it is also conceivable that the maximum speed of the air motor limited by the governor changes to the high speed side even if the supply pressure of the compressed air is constant. Therefore, in the air tool described in Patent Document 1, it is necessary to set a lower maximum speed setting value so that the rotational speed of the air motor does not exceed the allowable speed, and the product design freedom is reduced. Be done.
本発明は上記課題に鑑みてなされたものであり、その目的は、エアモータの最高速度を容易に再設定できるエアモータの調速機、及びエアツールを提供することにある。 The present invention has been made in view of the above problems, and an object thereof is to provide an air motor governor and an air tool capable of easily resetting the maximum speed of the air motor.
　本願に開示するエアモータの調速機は、エアモータの回転速度を調節する、エアモータの調速機であって、ガバナロッドと、ガバナバルブと、付勢手段と、押圧手段と、調節手段とを備える。前記ガバナロッドは、前記エアモータの回転軸と一体的に回転する。前記ガバナバルブは、前記ガバナロッドの軸方向に沿って移動可能に設けられ、前記エアモータに対する圧縮ガスの供給流量を増減する。前記付勢手段は、前記軸方向に配設され、前記軸方向の一端部で前記ガバナバルブと当接し、前記供給流量が増大する開弁方向に前記ガバナバルブを付勢する。前記押圧手段は、前記エアモータの回転速度が増大するに連れて増大する抗力を発生し、前記付勢手段が前記ガバナバルブを付勢する付勢力に抗して、前記供給流量が減少する閉弁方向に前記ガバナバルブを押圧する。前記調節手段は、前記付勢力を調節する。 The air motor speed governor disclosed in the present application is an air motor speed governor that adjusts the rotational speed of the air motor, and includes a governor rod, a governor valve, biasing means, pressing means, and adjusting means. The governor rod rotates integrally with the rotation shaft of the air motor. The governor valve is movably provided along the axial direction of the governor rod to increase or decrease the supply flow rate of compressed gas to the air motor. The biasing means is disposed in the axial direction, contacts with the governor valve at one end in the axial direction, and biases the governor valve in a valve opening direction in which the supply flow rate increases. The pressing means generates a resistance that increases as the rotational speed of the air motor increases, and the valve closing direction in which the supply flow rate decreases against the biasing force of the biasing unit biasing the governor valve. Press the governor valve. The adjusting means adjusts the biasing force.
　本願に開示するエアモータの調速機において、前記調節手段は、ストッパと、位置決め手段とを有する。前記ストッパは、前記ガバナロッドの軸方向に沿って移動可能に設けられ、前記付勢手段における、前記軸方向の他端部と当接する。前記位置決め手段は、前記ガバナロッドに装着され、前記ストッパと係合し、前記ストッパを前記軸方向の所定位置に位置決めする。そして、前記ストッパは、前記位置決め手段に係合される複数の被係合部であって、前記軸方向の位置が互いに異なる複数の被係合部を有している。 In the speed controller of the air motor disclosed in the present application, the adjustment means includes a stopper and positioning means. The stopper is provided so as to be movable along the axial direction of the governor rod, and abuts on the other axial end of the biasing means. The positioning means is mounted on the governor rod, engages with the stopper, and positions the stopper at a predetermined position in the axial direction. The stopper is a plurality of engaged portions engaged with the positioning means, and has a plurality of engaged portions different in axial position.
　本願に開示するエアモータの調速機において、前記ストッパは、前記ガバナロッドと同軸に設けられており、前記ガバナロッドの軸心を中心として前記ガバナロッドに対して相対回転可能であり、前記複数の被係合部は、前記ガバナロッドの軸心と同心の円に沿って配設されている。 In the speed controller of the air motor disclosed in the present application, the stopper is provided coaxially with the governor rod, is rotatable relative to the governor rod about the axial center of the governor rod, and the plurality of engaged engagements The portions are disposed along a circle concentric with the axis of the governor rod.
　本願に開示するエアモータの調速機において、前記ストッパは、前記閉弁方向に向いている端面部を有している。前記複数の被係合部は、前記端面部に形成され前記軸方向の深さが互いに異なる複数の溝の底部である。 In the speed controller of the air motor disclosed in the present application, the stopper has an end surface portion facing in the valve closing direction. The plurality of engaged portions are bottom portions of a plurality of grooves formed in the end surface portion and having different axial depths.
本願に開示するエアツールは、エアモータと、上記に記載のエアモータの調速機とを備える。エアツールは、エアグラインダであってもよく、エアサンダであってもよく、エアポリッシャであってもよい。 The air tool disclosed in the present application includes an air motor and the speed controller of the air motor described above. The air tool may be an air grinder, an air sander or an air polisher.
　本発明のエアモータの調速機、及びエアツールによれば、調節手段によって付勢手段の付勢力を調節できるので、エアモータの最高速度を容易に再設定できる。 According to the speed controller of the air motor and the air tool of the present invention, since the biasing force of the biasing means can be adjusted by the adjusting means, the maximum speed of the air motor can be easily reset.
実施形態に係るエアツールを示す概略断面図である。It is a schematic sectional drawing which shows the air tool which concerns on embodiment. 実施形態に係る調速機を示す詳細断面図である。It is a detailed sectional view showing a speed governor concerning an embodiment. 実施形態に係る調速機を示す概略断面図である。（ａ）は、エアモータが回転していないときの調速機を示す概略断面図である。（ｂ）は、エアモータが回転しているときの調速機を示す概略断面図である。BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic sectional drawing which shows the speed governor which concerns on embodiment. (A) is a schematic sectional drawing which shows a speed governor when the air motor is not rotating. (B) is a schematic sectional drawing which shows a speed governor when the air motor is rotating. （ａ）は、実施形態に係るストッパを示す右側斜視図である。（ｂ）は、実施形態に係るストッパを示す左側斜視図である。(A) is a right side perspective view showing a stopper concerning an embodiment. (B) is a left side perspective view showing a stopper concerning an embodiment. （ａ）は、実施形態に係るストッパを示す平面図である。（ｂ）は、図５（ａ）におけるＡ－Ａ線断面図である。(A) is a top view showing a stopper concerning an embodiment. FIG. 5 (b) is a sectional view taken along line AA in FIG. 5 (a). 実施形態に係る調速機を示す概略断面図である。（ａ）は、スプリングが高荷重状態であるときの調速機を示す概略断面図である。（ｂ）は、スプリングが低荷重状態であるときの調速機を示す概略断面図である。BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic sectional drawing which shows the speed governor which concerns on embodiment. (A) is a schematic sectional drawing which shows a governor when a spring is in a high load state. (B) is a schematic sectional drawing which shows a governor when a spring is in a low load state.
　以下、本発明の実施形態におけるエアモータの調速機、及びエアツールを図面に基づいて詳しく説明する。なお、以下に説明する実施形態は、本発明を実施するに好ましい具体例であるから、技術的に種々の限定がなされているが、本発明は、以下の説明において特に発明を限定する旨が明記されていない限り、この実施形態に限定されるものではない。そして、説明中の左方向及び右方向は、図１、図２、図３、図６における左方向及び右方向にそれぞれ対応している。 Hereinafter, a speed governor for an air motor and an air tool according to an embodiment of the present invention will be described in detail based on the drawings. Note that although the embodiments described below are specific examples preferable for practicing the present invention, various technical limitations have been made, but the present invention is intended to particularly limit the invention in the following description. Unless stated otherwise, it is not limited to this embodiment. The left direction and the right direction in the description correspond to the left direction and the right direction in FIGS. 1, 2, 3 and 6, respectively.
〈実施形態〉
　図１に示すように、本実施形態におけるエアツールはエアグラインダであり、当該エアグラインダは、エアモータ１０と、エアモータ１０の回転速度を調節する調速機２０と、エアモータ１０の回転出力を研磨盤４０に伝達する伝達機構３０とを備えている。 Embodiment
As shown in FIG. 1, the air tool in the present embodiment is an air grinder, and the air grinder is an air motor 10, a governor 20 for adjusting the rotation speed of the air motor 10, and a polishing machine for rotating the rotation of the air motor 10. And a transmission mechanism 30 for transmitting information to T.40.
　エアモータ１０は、図示しないコンプレッサから圧縮ガスＰＧが供給され、圧縮ガスＰＧによって駆動される。圧縮ガスＰＧは、例えば圧縮空気である。具体的には、エアモータ１０は、ロータ１１と、ロータ１１を収容する円筒状のハウジング１５とを有している。ハウジング１５は、２つの端板１５ａを有している。ロータ１１は、エアモータ１０に対する圧縮ガスＰＧの供給流量Ｑに応じた回転速度で回転される。エアモータ１０の回転速度は、ロータ１１の回転速度に対応している。 The air motor 10 is supplied with the compressed gas PG from a compressor (not shown) and is driven by the compressed gas PG. The compressed gas PG is, for example, compressed air. Specifically, the air motor 10 has a rotor 11 and a cylindrical housing 15 that accommodates the rotor 11. The housing 15 has two end plates 15a. The rotor 11 is rotated at a rotational speed corresponding to the supply flow rate Q of the compressed gas PG to the air motor 10. The rotational speed of the air motor 10 corresponds to the rotational speed of the rotor 11.
　圧縮ガスＰＧは、図示しない圧縮空気用ホースなどの給送管を通して当該エアグラインダまで給送され、導入経路５０を通してガス導入スペース６０に導入される。ガス導入スペース６０には、調速機２０が収容されている。また、ガス導入スペース６０の周壁６１には、導入経路５０とガス導入スペース６０とを連通する開口５１が形成されている。ガス導入スペース６０に導入された圧縮ガスＰＧは、図示しない供給経路を通してエアモータ１０に供給される。エアモータ１０として、公知のベーン式エアモータを使用することができる。 The compressed gas PG is fed to the air grinder through a feed pipe such as a compressed air hose (not shown) and introduced into the gas introduction space 60 through the introduction path 50. In the gas introduction space 60, a governor 20 is accommodated. Further, an opening 51 communicating the introduction path 50 with the gas introduction space 60 is formed in the peripheral wall 61 of the gas introduction space 60. The compressed gas PG introduced into the gas introduction space 60 is supplied to the air motor 10 through a supply path (not shown). As the air motor 10, a well-known vane type air motor can be used.
　ロータ１１は、左右両端から突出するように、左側回転軸１２及び右側回転軸１３が一体的に形成されている。左側回転軸１２及び右側回転軸１３は、２つのラジアルベアリング１４を介してハウジング１５の２つの端板１５ａに支持されている。左側回転軸１２は出力軸であり伝達機構３０に接続される。右側回転軸１３は調速機２０に接続される。伝達機構３０は、左側回転軸１２から出力されるエアモータの回転出力を研磨盤４０に伝達する。研磨盤４０は、エアモータ１０の回転速度に対応した回転速度で回転する。 The rotor 11 is integrally formed with the left rotation shaft 12 and the right rotation shaft 13 so as to project from both left and right ends. The left rotation shaft 12 and the right rotation shaft 13 are supported by the two end plates 15 a of the housing 15 via two radial bearings 14. The left rotation shaft 12 is an output shaft and is connected to the transmission mechanism 30. The right side rotation shaft 13 is connected to the governor 20. The transmission mechanism 30 transmits the rotation output of the air motor output from the left rotation shaft 12 to the polishing disk 40. The polishing disc 40 rotates at a rotational speed corresponding to the rotational speed of the air motor 10.
　図２に示すように、調速機２０は、ガバナロッド２１と、ガバナバルブ２２と、スプリング２３と、ガバナボディ２４と、複数の鋼球２５と、ストッパ２６と、ピン２７とを有する。ガバナロッド２１は、右側回転軸１３と一体的に回転するように、右側回転軸１３に連結されている。 As shown in FIG. 2, the speed governor 20 has a governor rod 21, a governor valve 22, a spring 23, a governor body 24, a plurality of steel balls 25, a stopper 26, and a pin 27. The governor rod 21 is connected to the right rotation shaft 13 so as to rotate integrally with the right rotation shaft 13.
　ガバナバルブ２２は、ガバナロッド２１の軸方向Ｘに沿って移動可能に設けられており、エアモータ１０に対する圧縮ガスＰＧの供給流量Ｑを増減する。具体的には、ガバナバルブ２２は、ガバナロッド２１と同軸に設けられた筒状部材である。ガバナバルブ２２は、ガバナロッド２１の先端側（図２において右側）に配される径一定部２２ａと、ガバナロッド２１の基端側（図２において左側）に配される拡径部２２ｂとを有する。拡径部２２ｂは、径一定部２２ａの左端部に連設され、ガバナロッド２１の基端側に向かうに連れてスカート状に径が大きくなるように形成されている。 The governor valve 22 is provided so as to be movable along the axial direction X of the governor rod 21, and increases or decreases the supply flow rate Q of the compressed gas PG to the air motor 10. Specifically, the governor valve 22 is a cylindrical member provided coaxially with the governor rod 21. The governor valve 22 has a constant diameter portion 22a disposed on the distal end side (right side in FIG. 2) of the governor rod 21 and an enlarged diameter portion 22b disposed on the proximal end side (left side in FIG. 2) of the governor rod 21. The enlarged diameter portion 22 b is continuous with the left end portion of the constant diameter portion 22 a, and is formed to increase in diameter in a skirt shape toward the proximal end side of the governor rod 21.
　径一定部２２ａは、図２に示すように、ガバナロッド２１が挿通される軸孔２２ｃを有している。ガバナバルブ２２は、軸孔２２ｃにガバナロッド２１が挿通された状態で、ガバナロッド２１に対して軸方向Ｘに移動自在である。また、径一定部２２ａの周壁には、当該周壁を貫通するように、一対の長孔２２ｄが軸方向Ｘに形成されている。一対の長孔２２ｄは、ガバナロッド２１の軸心を間に挟んで対向している。 As shown in FIG. 2, the constant diameter portion 22a has an axial hole 22c through which the governor rod 21 is inserted. The governor valve 22 is movable in the axial direction X with respect to the governor rod 21 in a state where the governor rod 21 is inserted into the shaft hole 22c. A pair of long holes 22 d is formed in the axial direction X in the peripheral wall of the constant diameter portion 22 a so as to penetrate the peripheral wall. The pair of elongated holes 22 d are opposed to each other with the axial center of the governor rod 21 interposed therebetween.
　スプリング２３は、軸方向Ｘに配設され、軸方向Ｘの一端部がガバナバルブ２２と当接し、供給流量Ｑが増大する開弁方向Ｘ１にガバナバルブ２２を付勢する。スプリング２３における、軸方向Ｘの一端部とは、軸方向Ｘの両端部のうちガバナロッド２１の基端側端部であり、図２において左端部である。本実施形態におけるスプリング２３が特許請求の範囲における付勢手段に対応している。 The spring 23 is disposed in the axial direction X, and one end in the axial direction X abuts on the governor valve 22 to bias the governor valve 22 in the valve opening direction X1 in which the supply flow rate Q increases. One end of the spring 23 in the axial direction X is the end on the proximal end side of the governor rod 21 among both ends in the axial direction X, and is the left end in FIG. The spring 23 in this embodiment corresponds to the biasing means in the claims.
　ガバナボディ２４は、ガバナロッド２１と同軸に、ガバナバルブ２２に対してガバナロッド２１の基端側に配された円形の部材であり、ガバナロッド２１に固定されている。また、ガバナボディ２４は、ガバナバルブ２２が当接される被当接部２４ａと、環状の斜面部２４ｂとを有する。ガバナバルブ２２は、被当接部２４ａに当接されることによって、ガバナロッド２１の基端側への移動が規制される。斜面部２４ｂは、径方向の外側部が内側部よりガバナロッド２１の先端側に位置するように、軸方向Ｘに対して傾斜している。 The governor body 24 is a circular member coaxial with the governor rod 21 and disposed on the proximal end side of the governor rod 21 with respect to the governor valve 22, and is fixed to the governor rod 21. Further, the governor body 24 has an abutted portion 24 a with which the governor valve 22 abuts, and an annular slope portion 24 b. The governor valve 22 is restricted in movement of the governor rod 21 to the proximal end side by being abutted against the abutted portion 24 a. The sloped portion 24b is inclined with respect to the axial direction X such that the radially outer portion is located closer to the tip end of the governor rod 21 than the inner portion.
　複数の鋼球２５は、ガバナバルブ２２とガバナボディ２４との間に配設されており、斜面部２４ｂと拡径部２２ｂの内側面とに当接可能である。後で詳しく説明するように、複数の鋼球２５は、ガバナボディ２４と協働して、エアモータ１０の回転速度が増大するに連れて増大する抗力ＡＦを発生し、スプリング２３がガバナバルブ２２を付勢する付勢力Ｆに抗して、供給流量Ｑが減少する閉弁方向Ｘ２にガバナバルブ２２を押圧する。本実施形態におけるガバナボディ２４及び鋼球２５が特許請求の範囲における押圧手段に対応している。すなわち、押圧手段は、ガバナロッド２１と同軸に設けられ、ガバナバルブ２２に対してガバナロッド２１の基端側に配されたガバナボディ２４と、複数の鋼球２５とを有し、ガバナボディ２４は径方向の外側部が内側部よりガバナロッド２１の先端側に位置するように、軸方向Ｘに対して傾斜した斜面部２４ｂを有し、複数の鋼球２５は、斜面部２４ｂとガバナバルブ２２とに当接可能に、ガバナバルブ２２とガバナボディ２４との間に配設される。 The plurality of steel balls 25 are disposed between the governor valve 22 and the governor body 24, and can be in contact with the inclined surface 24b and the inner side surface of the enlarged diameter portion 22b. As will be described in detail later, the plurality of steel balls 25 cooperate with the governor body 24 to generate a resistance AF which increases as the rotational speed of the air motor 10 increases, and the spring 23 mounts the governor valve 22. The governor valve 22 is pressed in the valve closing direction X2 in which the supply flow rate Q decreases, against the biasing force F that is biased. The governor body 24 and the steel ball 25 in the present embodiment correspond to the pressing means in the claims. That is, the pressing means is provided coaxially with the governor rod 21 and has a governor body 24 disposed on the proximal end side of the governor rod 21 with respect to the governor valve 22 and a plurality of steel balls 25. And the plurality of steel balls 25 are in contact with the sloped portion 24b and the governor valve 22 so that the outer portion of the rod is positioned closer to the tip end side of the governor rod 21 than the inner portion. It is arranged between the governor valve 22 and the governor body 24 as possible.
　ストッパ２６は、軸方向Ｘに沿って移動可能に設けられ、スプリング２３における、軸方向Ｘの他端部と当接する。スプリング２３における、軸方向Ｘの他端部とは、軸方向Ｘの両端部のうちガバナロッド２１の先端側端部であり、図２において右端部である。具体的には、ストッパ２６は、ガバナロッド２１と同軸に設けられており、ガバナロッド２１の軸心を中心としてガバナロッド２１に対して相対回転可能である。より具体的には、ストッパ２６は、中空部を有する円環状の部材である。ストッパ２６は、当該中空部にガバナバルブ２２の径一定部２２ａが挿通され、内周面で径一定部２２ａの外周面と摺接することによって、軸方向Ｘに沿って移動可能である。なお、ストッパ２６の詳細は、図４、図５を参照して後述する。 The stopper 26 is provided movably along the axial direction X, and abuts on the other end of the spring 23 in the axial direction X. The other end of the spring 23 in the axial direction X is the tip end of the governor rod 21 at both ends in the axial direction X, and is the right end in FIG. Specifically, the stopper 26 is provided coaxially with the governor rod 21, and is rotatable relative to the governor rod 21 about the axial center of the governor rod 21. More specifically, the stopper 26 is an annular member having a hollow portion. The stopper 26 is movable along the axial direction X by inserting the constant diameter portion 22a of the governor valve 22 into the hollow portion and slidingly contacting the constant diameter portion 22a on the inner peripheral surface thereof. The details of the stopper 26 will be described later with reference to FIGS. 4 and 5.
　ピン２７は、ガバナロッド２１に装着されており、ストッパ２６と係合し、ストッパ２６を軸方向Ｘの所定位置に位置決めする。具体的には、ピン２７は、円柱状部材であり、ガバナロッド２１の横孔２１ａに嵌挿されている。横孔２１ａは、ガバナロッド２１の先端部の近傍に形成されており、ガバナロッド２１の中心軸と直交するように、ガバナロッド２１を貫通している。ピン２７の両端部は、２つの長孔２２ｄを通してガバナバルブ２２の外側に突出している。ストッパ２６は、ピン２７の両端部に係合されることによって、ガバナロッド２１の先端側への移動が規制され、ガバナロッド２１に対して軸方向Ｘの所定位置に位置決めされる。すなわち、ピン２７は、ストッパ２６と係合し、ストッパ２６の閉弁方向X2への移動、つまり、ストッパ２６がガバナロッド２１の先端側に移動することを規制する。本実施形態におけるピン２７が特許請求の範囲における位置決め手段に対応している。なお、上述したように、ピン２７は、一対の長孔２２ｄに挿通されている。長孔２２ｄが軸方向Ｘに長いことによって、ピン２７に対してガバナバルブ２２が軸方向Ｘに移動可能になる。また、ピン２７が一対の長孔２２ｄに挿通されることによって、ガバナバルブ２２のガバナロッド２１に対する相対回転が規制される。 The pin 27 is mounted on the governor rod 21 and engages with the stopper 26 to position the stopper 26 at a predetermined position in the axial direction X. Specifically, the pin 27 is a cylindrical member and is inserted into the lateral hole 21 a of the governor rod 21. The lateral hole 21 a is formed in the vicinity of the tip end portion of the governor rod 21, and penetrates the governor rod 21 so as to be orthogonal to the central axis of the governor rod 21. Both ends of the pin 27 protrude to the outside of the governor valve 22 through the two elongated holes 22 d. The stopper 26 is engaged with both ends of the pin 27 to restrict the movement of the governor rod 21 toward the tip end, and is positioned at a predetermined position in the axial direction X with respect to the governor rod 21. That is, the pin 27 engages with the stopper 26 and regulates the movement of the stopper 26 in the valve closing direction X2, that is, the movement of the stopper 26 to the tip end side of the governor rod 21. The pin 27 in this embodiment corresponds to the positioning means in the claims. As described above, the pin 27 is inserted into the pair of long holes 22d. The elongated hole 22 d in the axial direction X enables the governor valve 22 to move in the axial direction X with respect to the pin 27. Further, the relative rotation of the governor valve 22 with respect to the governor rod 21 is restricted by inserting the pin 27 into the pair of elongated holes 22 d.
　　次に、図３を参照して、調速機２０の基本的な動作を説明する。 Next, with reference to FIG. 3, the basic operation of the governor 20 will be described.
　図３（ａ）は、エアモータ１０が回転していないときの調速機２０を示す。図３（ａ）に示すように、導入経路５０の開口５１は、ガバナバルブ２２の一端部２２ｅに対向している。ガバナバルブ２２の一端部２２ｅとは、ガバナバルブ２２における、軸方向Ｘの両端部のうちガバナロッド２１の先端側端部である。エアモータ１０が回転していないとき、ガバナバルブ２２は、スプリング２３の付勢力によって、ガバナボディ２４に当接する。ガバナバルブ２２がガバナボディ２４に当接しているとき、ガバナバルブ２２の一端部２２ｅと開口５１との距離は最大となる。ガバナバルブ２２の一端部２２ｅと開口５１との距離が大きいほど、ガス導入スペース６０に圧縮ガスＰＱが導入されやすくなり、供給流量Ｑは増大する。 FIG. 3A shows the governor 20 when the air motor 10 is not rotating. As shown in FIG. 3A, the opening 51 of the introduction path 50 is opposed to the one end 22 e of the governor valve 22. The one end 22 e of the governor valve 22 is the tip end of the governor rod 21 among the two ends in the axial direction X of the governor valve 22. When the air motor 10 is not rotating, the governor valve 22 abuts on the governor body 24 by the biasing force of the spring 23. When the governor valve 22 is in contact with the governor body 24, the distance between the one end 22e of the governor valve 22 and the opening 51 is maximized. As the distance between one end 22e of the governor valve 22 and the opening 51 increases, the compressed gas PQ is more easily introduced into the gas introduction space 60, and the supply flow rate Q increases.
　図３（ｂ）は、エアモータ１０が回転しているときの調速機２０を示す。エアモータ１０が回転を開始すると、遠心力によって鋼球２５が径方向の外側に移動する。鋼球２５が径方向の外側に移動すると、鋼球２５は、斜面部２４ｂに沿って、ガバナロッド２１の先端側に移動する。鋼球２５がガバナロッド２１の先端側に移動すると、鋼球２５は、スプリング２３の付勢力Ｆに抗してガバナバルブ２２をガバナロッド２１の先端側に押圧する。鋼球２５がガバナバルブ２２を押圧する抗力ＡＦは、エアモータ１０の回転速度が増大するに連れて増大する。そして、抗力ＡＦがスプリング２３の付勢力Ｆを上回ると、ガバナバルブ２２はガバナロッド２１の先端側に移動する。ガバナバルブ２２がガバナロッド２１の先端側に移動すると、ガバナバルブ２２の一端部２２ｅと開口５１との距離が小さくなり、供給流量Ｑは減少する。 FIG. 3 (b) shows the governor 20 when the air motor 10 is rotating. When the air motor 10 starts to rotate, the steel balls 25 move radially outward due to the centrifugal force. When the steel ball 25 moves radially outward, the steel ball 25 moves to the tip end side of the governor rod 21 along the slope portion 24 b. When the steel ball 25 moves to the tip side of the governor rod 21, the steel ball 25 presses the governor valve 22 to the tip side of the governor rod 21 against the biasing force F of the spring 23. The reaction force AF that the steel ball 25 presses the governor valve 22 increases as the rotational speed of the air motor 10 increases. Then, when the reaction force AF exceeds the biasing force F of the spring 23, the governor valve 22 moves to the tip end side of the governor rod 21. When the governor valve 22 moves to the tip end side of the governor rod 21, the distance between the one end 22e of the governor valve 22 and the opening 51 decreases, and the supply flow rate Q decreases.
　上述したように、抗力ＡＦがスプリング２３の付勢力Ｆを上回ると、供給流量Ｑは減少する。供給流量Ｑの減少量は、エアモータ１０の回転速度が増大するに連れて大きくなる。その結果、エアモータ１０の最高速度が制限され、エアモータ１０の回転速度が安全性を考慮して決められる許容速度を超えないように供給流量Ｑが調節される。 As described above, when the reaction force AF exceeds the biasing force F of the spring 23, the supply flow rate Q decreases. The amount of decrease of the supply flow rate Q increases as the rotational speed of the air motor 10 increases. As a result, the maximum speed of the air motor 10 is limited, and the supply flow rate Q is adjusted so that the rotational speed of the air motor 10 does not exceed the allowable speed determined in consideration of safety.
　次に、図４、図５を参照して、ストッパ２６の詳細を説明する。 Next, the details of the stopper 26 will be described with reference to FIGS. 4 and 5.
　図４に示すように、ストッパ２６は、ピン２７に係合される複数の被係合部２８を有している。複数の被係合部２８は、軸方向Ｘの位置が互いに異なっている。具体的には、ストッパ２６は、ガバナロッド２１と同軸に設けられており、ガバナロッド２１の軸心を中心としてガバナロッド２１に対して相対回転可能である。複数の被係合部２８は、ガバナロッド２１の軸心と同心の円に沿って配設されている。より具体的には、ストッパ２６は、開弁方向Ｘ１に向いている第１端面部２６ａと、閉弁方向Ｘ２に向いている第２端面部２６ｂとを有している。第１端面部２６ａ及び第２端面部２６ｂは、ガバナロッド２１の軸心に直交している。第１端面部２６ａには、スプリング２３における、軸方向Ｘの他端部が当接する。第２端面部２６ｂには、複数の溝２９が形成されている。複数の溝２９には、ピン２７の端部が嵌る。ピン２７の端部が溝２９に嵌ると、ピン２７に当該溝２９の底部が係合される。すなわち、複数の被係合部２８は、複数の溝２９の底部である。本実施形態における第２端面部２６ｂが特許請求の範囲における「端面部」に対応している。また、複数の溝２９は、それぞれがストッパ２６の径方向に延びるように第２端面部２６ｂに形成されており、当該径方向の両端のうち内側端は、ストッパ２６の中空部に向かって開口している。また、第２端面部２６ｂには、複数の溝２９に対応して、複数のマーク２６ｃが設けられている。 As shown in FIG. 4, the stopper 26 has a plurality of engaged portions 28 engaged with the pins 27. The positions of the plurality of engaged portions 28 in the axial direction X are different from each other. Specifically, the stopper 26 is provided coaxially with the governor rod 21, and is rotatable relative to the governor rod 21 about the axial center of the governor rod 21. The plurality of engaged portions 28 are disposed along a circle concentric with the axial center of the governor rod 21. More specifically, the stopper 26 has a first end face 26a facing in the valve opening direction X1 and a second end face 26b facing in the valve closing direction X2. The first end face 26 a and the second end face 26 b are orthogonal to the axial center of the governor rod 21. The other end of the spring 23 in the axial direction X abuts on the first end face portion 26 a. A plurality of grooves 29 are formed in the second end face portion 26b. The ends of the pins 27 fit into the plurality of grooves 29. When the end of the pin 27 fits in the groove 29, the bottom of the groove 29 is engaged with the pin 27. That is, the plurality of engaged portions 28 are bottoms of the plurality of grooves 29. The second end face portion 26 b in the present embodiment corresponds to the “end face portion” in the claims. Further, the plurality of grooves 29 are formed in the second end face portion 26 b so as to extend in the radial direction of the stopper 26, and the inner ends of the both ends in the radial direction are opened toward the hollow portion of the stopper 26. doing. Further, a plurality of marks 26 c are provided in the second end face portion 26 b in correspondence to the plurality of grooves 29.
　より詳細には、図５に示すように、第２端面部２６ｂには、複数の溝２９としての第１溝２９1、第２溝２９2、第３溝２９3、第４溝２９4が形成されている。第１溝２９1、第２溝２９2、第３溝２９3、第４溝２９4の各々は、第２端面部２６ｂに２つずつ形成されている。各一対の第１溝２９1、第２溝２９2、第３溝２９3、第４溝２９4は、ピン２７の両端部に対応して、ストッパ２６の軸心を間に挟んで対向している。第１溝２９1の深さＬ１と、第２溝２９2の深さＬ２と、第３溝２９3の深さＬ３と、第４溝２９4の深さＬ４は互いに異なっている。具体的には、第１溝２９1の深さＬ１は第２溝２９2の深さＬ２より小さく、第２溝２９2の深さＬ２は第３溝２９3の深さＬ３より小さく、第３溝２９3の深さＬ３は第４溝２９4の深さＬ４より小さい。すなわち、深さＬ１＜深さＬ２＜深さＬ３＜深さＬ４である。 More specifically, as shown in FIG. 5, the second end face 26 b includes a first groove 29 1 , a second groove 29 2 , a third groove 29 3 , and a fourth groove 29 4 as the plurality of grooves 29. It is formed. Each of the first groove 29 1 , the second groove 29 2 , the third groove 29 3 , and the fourth groove 29 4 is formed two by two in the second end face portion 26 b. The first groove 29 1 of each pair, the second groove 29 2, third groove 29, third, fourth grooves 29 4, corresponding to both ends of the pin 27, and face each other between the axial center of the stopper 26 ing. A first groove 29 1 of the depth L1, a second groove 29 second depth L2, the depth L3 of the third groove 29 3, the depth L4 of the fourth groove 29 4 are different from each other. Specifically, the depth L1 of the first groove 29 1 is less than the second groove 29 second depth L2, the second grooves 29 and second depth L2 smaller than the depth L3 of the third groove 29 3, the 3 groove 29 third depth L3 is smaller than the fourth groove 29 fourth depth L4. That is, depth L1 <depth L2 <depth L3 <depth L4.
　複数の被係合部２８としての第１被係合部２８1、第２被係合部２８2、第３被係合部２８3、第４被係合部２８4は、第１溝２９1、第２溝２９2、第３溝２９3、第４溝２９4の底部であり、ストッパ２６に２つずつ設けられている。上述したように、深さＬ１＜深さＬ２であることから、軸方向Ｘにおいて、第１被係合部２８1は第２被係合部２８2よりガバナロッド２１の先端側に位置する。また、深さＬ２＜深さＬ３であることから、軸方向Ｘにおいて、第２被係合部２８2は第３被係合部２８3よりガバナロッド２１の先端側に位置する。また、深さＬ３＜深さＬ４であることから、軸方向Ｘにおいて、第３被係合部２８3は第４被係合部２８4よりガバナロッド２１の先端側に位置する。 The first engaged portion 28 as a plurality of engaged portions 28 1, the second engaged portion 28 2, third engaged portion 28 3, the fourth engagement portion 28 4, the first groove 29 1, second groove 29 2, third groove 29 3, a bottom of the fourth groove 29 4 are provided two on the stopper 26. As described above, since the depth L1 <depth L2, in the axial direction X, the first engaged portion 28 1 is positioned on the distal end side of the second engaged portion 28 2 than Gabanaroddo 21. Further, since the depth L2 <depth L3, in the axial direction X, the second engaged portion 28 2 is located on the distal end side of the Gabanaroddo 21 than the third engaged portion 28 3. Further, since the depth L3 <depth L4, in the axial direction X, the third engaged portion 28 3 is positioned on the distal end side of the Gabanaroddo 21 than the fourth engagement portion 28 4.
　複数のマーク２６ｃは、１又は複数の突起を含み、突起の数に応じて当該溝が第１溝２９1、第２溝２９2、第３溝２９3、第４溝２９4のいずれであるかを識別できるようになっている。したがって、例えば光量が充分ではない環境下であっても指で触れることによって、各溝を識別できる。 The plurality of marks 26 c include one or more projections, and the grooves are any of the first groove 29 1 , the second groove 29 2 , the third groove 29 3 , and the fourth groove 29 4 according to the number of the projections. Can be identified. Therefore, for example, each groove can be identified by touching with a finger even in an environment where the light amount is not sufficient.
　次に、図６を参照して、調速機２０の特徴的な動作を説明する。 Next, the characteristic operation of the governor 20 will be described with reference to FIG.
　図６（ａ）は、ピン２７が、第１被係合部２８1に係合しているときの調速機２０を示す。ピン２７が第１被係合部２８1に係合しているとき、スプリング２３の長さを「長さＬ１１」と示し、スプリング２３の付勢力を「付勢力Ｆ１」と示し、ストッパ２６が位置決めされる所定位置を「位置Ｐ１」と示す。 6 (a) is a pin 27, shows the speed governor 20 when engaged with the first engaged portion 28 1. When the pin 27 is engaged with the first engaged portion 28 1, the length of the spring 23 indicated as "length L11 ', the urging force of the spring 23 indicated as" biasing force F1', the stopper 26 The predetermined position to be positioned is referred to as "position P1".
　図６（ｂ）は、ピン２７が、第４被係合部２８4に係合しているときの調速機２０を示す。ピン２７が第４被係合部２８4に係合しているとき、スプリング２３の長さを「長さＬ１２」と示し、スプリング２３の付勢力を「付勢力Ｆ２」と示し、ストッパ２６が位置決めされる所定位置を「位置Ｐ２」と示す。なお、図６（ａ）、図６（ｂ）においては、エアモータ１０は回転していない。また、位置Ｐ１、位置Ｐ２は、第１端面部２６ａの位置を基準に決めている。 6 (b) is a pin 27, shows the speed governor 20 when engaged with the fourth engagement portion 28 4. When the pin 27 is engaged with the fourth engagement portion 28 4, the length of the spring 23 indicated as "length L12 ', the urging force of the spring 23 indicated as" biasing force F2', the stopper 26 The predetermined position to be positioned is referred to as "position P2". In FIG. 6A and FIG. 6B, the air motor 10 is not rotating. Further, the position P1 and the position P2 are determined based on the position of the first end face portion 26a.
　図６（ａ）、図６（ｂ）に示すように、第１被係合部２８1にピン２７が係合されているときのストッパ２６の位置Ｐ１は、第４被係合部２８4にピン２７が係合されているときのストッパ２６の位置Ｐ２よりガバナロッド２１の基端側に位置し、長さＬ１１は長さＬ１２より短くなる。長さＬ１１が長さＬ１２より短いことによって、付勢力Ｆ１は付勢力Ｆ２より大きくなる。すなわち、第１被係合部２８1にピン２７が係合されているときの方が第４被係合部２８4にピン２７が係合されているときより、スプリング２３の取り付け荷重（初期荷重）が大きくなる。 As shown in FIG. 6 (a), FIG. 6 (b), the position P1 of the stopper 26 when the first engaged portion 28 1 a pin 27 is engaged, the fourth engagement portion 28 4 Is positioned on the proximal end side of the governor rod 21 from the position P2 of the stopper 26 when the pin 27 is engaged, and the length L11 is shorter than the length L12. As the length L11 is shorter than the length L12, the biasing force F1 becomes larger than the biasing force F2. That is, from when the person when the first engaged portion 28 1 a pin 27 is engaged pin 27 is engaged with the fourth engagement portion 28 4, the attachment of the spring 23 load (initial The load) increases.
　スプリング２３の初期荷重が大きいほど、エアモータの回転速度が増大してもガバナバルブ２２は閉弁方向Ｘ２に移動しにくくなる。したがって、第１被係合部２８1にピン２７が係合されているときの方が第４被係合部２８4にピン２７が係合されているときより、エアモータの最高速度は高くなる。以上のようにして、エアモータの最高速度が再設定される。 As the initial load of the spring 23 is larger, the governor valve 22 is less likely to move in the valve closing direction X2 even if the rotational speed of the air motor is increased. Therefore, from when the person when the first engaged portion 28 1 a pin 27 is engaged pin 27 is engaged with the fourth engagement portion 28 4, the maximum speed of the air motor is increased . As described above, the maximum speed of the air motor is reset.
　次に、図６を参照して、ピン２７が係合される被係合部を複数の被係合部２８の間で切り替える切り替え方法を説明する。 Next, with reference to FIG. 6, the switching method of switching the engaged portion in which the pin 27 is engaged between the plurality of engaged portions 28 will be described.
　例えば、ピン２７が係合される被係合部を第１被係合部２８1から第４被係合部２８4に切り替えるときには、スプリング２３の弾性力に抗してストッパ２６を開弁方向Ｘ１に押し込み、ピン２７と第１被係合部２８1との係合を解除する。次に、ピン２７の両端部が２つの第４溝２９4に嵌る位置までストッパ２６を回転し、ストッパ２６を開弁方向Ｘ１に押し込む力を緩め、ピン２７と第４被係合部２８4とを係合させる。 For example, when switching the engaged portion which the pin 27 is engaged from the first engaged portion 28 1 to the fourth engagement portion 28 4, the valve opening direction stopper 26 against the elastic force of the spring 23 pushing the X1, to release the engagement between the pin 27 and the first engaged portion 28 1. Next, the stopper 26 is rotated to a position where both ends of the pin 27 is fitted into two of the fourth groove 29 4, loosen the force to push the stopper 26 in the valve opening direction X1, pin 27 and the fourth engagement portion 28 4 And engage.
　以上のように、本実施形態によれば、調速機２０がスプリング２３の付勢力を調節する機構（ストッパ２６、ピン２７）を備えている。従って、エアモータの最高速度を容易に再設定できる。 As described above, according to the present embodiment, the speed governor 20 includes the mechanism (the stopper 26 and the pin 27) for adjusting the biasing force of the spring 23. Therefore, the maximum speed of the air motor can be easily reset.
　また、ストッパ２６を開弁方向Ｘ１に押し込み、ストッパ２６を回転するだけの簡単な操作によって、スプリング２３の付勢力を変更できる。したがって、例えば調速機２０を分解するような煩雑な作業を行うことなく、エアモータの最高速度を更に容易に再設定できる。 Further, the urging force of the spring 23 can be changed by a simple operation of pushing the stopper 26 in the valve opening direction X1 and rotating the stopper 26. Therefore, the maximum speed of the air motor can be easily reset again without performing a complicated operation such as disassembling the governor 20, for example.
　また、本実施形態によれば、ピン２７が係合される被係合部を複数の被係合部２８の間で切り替えることから、ストッパ２６が位置決めされる軸方向Ｘの位置を段階的に変更できる。ストッパ２６の位置を段階的に変更できることから、高度の習熟を要することなく、エアモータ１０の最高速度を望ましい最高速度に設定できる。例えばネジ式に、ストッパ２６の位置を無段階に変更するような機構では、操作量（ネジの回転量）と、ストッパ２６の変位量と、最高速度の変化量との関係をユーザーが充分に把握するまでは、小数回の試行でエアモータ１０の最高速度を望ましい最高速度に設定できない。すなわち、無段階の機構では、エアモータ１０の最高速度を望ましい最高速度に設定するのに高度の習熟を要する。 Further, according to the present embodiment, since the engaged portion in which the pin 27 is engaged is switched between the plurality of engaged portions 28, the position in the axial direction X at which the stopper 26 is positioned is stepwise You can change it. Since the position of the stopper 26 can be changed stepwise, the maximum speed of the air motor 10 can be set to the desired maximum speed without requiring a high level of learning. For example, in a mechanism that changes the position of the stopper 26 steplessly in the form of a screw, the user can sufficiently set the relationship between the operation amount (screw rotation amount), the displacement amount of the stopper 26 and the change amount of the maximum speed. Until grasped, the maximum speed of the air motor 10 can not be set to the desired maximum speed in a few trials. That is, in the stepless mechanism, a high level of skill is required to set the maximum speed of the air motor 10 to the desired maximum speed.
　以上のように、本実施形態によれば、ストッパ２６は、軸方向Ｘの位置が互いに異なる複数の被係合部２８を有している。従って、ピン２７に係合される被係合部２８を切り替えるだけでスプリング２３の付勢力を調節することができ、エアモータの最高速度を容易に再設定できる。 As described above, according to the present embodiment, the stopper 26 has the plurality of engaged portions 28 in which the positions in the axial direction X are different from each other. Therefore, the biasing force of the spring 23 can be adjusted simply by switching the engaged portion 28 engaged with the pin 27, and the maximum speed of the air motor can be easily reset.
　また、本実施形態によれば、ストッパ２６は、ガバナロッド２２の軸心を中心としてガバナロッド２２に対して相対回転可能であり、複数の被係合部２８は、ガバナロッドの軸心と同心の円に沿って配設される。従って、ストッパ２６を回転するだけで、ピン２７に係合される被係合部２８を切り替えることができ、エアモータの最高速度を容易に再設定できる。 Further, according to the present embodiment, the stopper 26 is rotatable relative to the governor rod 22 centering on the axial center of the governor rod 22, and the plurality of engaged portions 28 are formed in a circle concentric with the axis of the governor rod. Arranged along. Therefore, only by rotating the stopper 26, the engaged portion 28 engaged with the pin 27 can be switched, and the maximum speed of the air motor can be easily reset.
　また、本実施形態によれば、複数の被係合部２８は、第２端面部２６ｂに形成され軸方向Ｘの深さが互いに異なる複数の溝２９の底部である。従って、エアモータ１０の回転によりストッパ２６がガバナロッド２１と共に回転したときに、ピン２７と係合する被係合部２８が勝手に切り替わらず、エアモータ１０の最高速度の設定を安定的に維持できる。例えばネジ式に、ストッパ２６の位置を無段階に変更する機構では、エアモータ１０の回転によりストッパ２６がガバナロッド２１と共に回転するときに、ストッパ２６がガバナロッド２１に対して回転することも考えられる。 Further, according to the present embodiment, the plurality of engaged portions 28 are bottom portions of the plurality of grooves 29 formed in the second end face portion 26 b and having different depths in the axial direction X from each other. Therefore, when the stopper 26 is rotated with the governor rod 21 by the rotation of the air motor 10, the engaged portion 28 engaged with the pin 27 is not switched freely, and the setting of the maximum speed of the air motor 10 can be stably maintained. For example, in a mechanism that changes the position of the stopper 26 steplessly in a screw manner, it is also conceivable that the stopper 26 rotates relative to the governor rod 21 when the stopper 26 rotates with the governor rod 21 by the rotation of the air motor 10.
　以上、図面（図１～図６）を参照しながら本発明の実施形態を説明した。但し、本発明は、上記の実施形態に限られるものではなく、その要旨を逸脱しない範囲で種々の態様において実施することが可能である（例えば、下記に示す（１）～（４））。 The embodiments of the present invention have been described above with reference to the drawings (FIGS. 1 to 6). However, the present invention is not limited to the above embodiment, and can be carried out in various modes without departing from the scope of the invention (for example, (1) to (4) shown below).
　（１）図１～図６を参照して説明したように、スプリング２３は、複数の被係合部２８とピン２７との係合により付勢力が調節された。これに限らず、スプリング２３は、例えばガバナバルブ２２と、スプリング２３との間に様々な厚みのシムを挟むことによって、付勢力が調節されてもよい。しかしながら、この形態では、シムを交換するときに調速機２０を分解する必要がある。これに対して、上記実施形態では、スプリング２３の付勢力を調節する際に調速機２０を分解する必要がなく、エアモータの最高速度を容易に再設定できる。 (1) As described with reference to FIGS. 1 to 6, the biasing force of the spring 23 is adjusted by the engagement between the plurality of engaged portions 28 and the pins 27. However, the biasing force may be adjusted by, for example, sandwiching shims of various thicknesses between the governor valve 22 and the spring 23. However, in this form, it is necessary to disassemble the governor 20 when replacing the shim. On the other hand, in the above embodiment, it is not necessary to disassemble the governor 20 when adjusting the biasing force of the spring 23, and the maximum speed of the air motor can be easily reset.
　（２）また、スプリング２３は、ガバナバルブ２２の先端側の外周面に雄ねじを形成し、ストッパ２６の内周面に雌ねじを形成し、雄ねじと雌ねじの螺合により無段階に付勢力が調節されてもよい。しかしながら、この形態では、上述したように、エアモータの最高速度を望ましい最高速度に設定するのに高度の習熟を要する。また、上述したように、エアモータ１０の回転によりストッパ２６がガバナロッド２１と共に回転するときに、ストッパ２６がガバナロッド２１に対して回転することも考えられる。また、スプリング２３の付勢力を調節する調節用ねじが調速機の内部に設けられていると、スプリング２３の付勢力を調節するときに調速機２０をエアモータ１０から取り外す必要が生じる。これに対して、上記実施形態では、スプリング２３の付勢力を調節する際に調速機２０をエアモータ１０から取り外す必要がなく、エアモータの最高速度を容易に再設定できる。 (2) Further, the spring 23 has a male screw formed on the outer peripheral surface on the tip end side of the governor valve 22 and a female screw formed on the inner peripheral surface of the stopper 26. The biasing force is adjusted steplessly by screwing the male screw and the female screw. May be However, in this configuration, as described above, it takes a high degree of learning to set the maximum speed of the air motor to the desired maximum speed. Further, as described above, it is also conceivable that the stopper 26 rotates with respect to the governor rod 21 when the stopper 26 rotates with the governor rod 21 by the rotation of the air motor 10. In addition, when the adjustment screw for adjusting the biasing force of the spring 23 is provided inside the governor, it is necessary to remove the governor 20 from the air motor 10 when adjusting the biasing force of the spring 23. On the other hand, in the above embodiment, when adjusting the biasing force of the spring 23, there is no need to remove the governor 20 from the air motor 10, and the maximum speed of the air motor can be easily reset.
　（３）図１～図６を参照して説明したように、調速機２０は、エアツールの一種としてのエアグラインダに備えられたが、これに限られない。本発明に係る調速機は、エアモータを駆動源とする機械であれば、どのような機械に備えられてもよい。また、エアツールはエアグラインダに限らず、エアサンダ、又はエアポリッシャであってもよい。 (3) As described with reference to FIGS. 1 to 6, the governor 20 is provided in an air grinder as a kind of air tool, but the invention is not limited thereto. The governor according to the present invention may be provided in any machine as long as it is an air motor as a drive source. Further, the air tool is not limited to the air grinder, and may be an air sander or an air polisher.
　（４）図４、図５を参照して説明したように、複数のマーク２６ｃは、１又は複数の突起を含むが、これに限られない。複数のマーク２６ｃは、複数の溝２９の異同を示し得るものであればよく、数字、文字、記号を含んでもよい。あるいは、複数のマーク２６ｃは、１又は複数の凹部を含んでもよい。 (4) As described with reference to FIG. 4 and FIG. 5, the plurality of marks 26 c include one or more protrusions, but is not limited thereto. The plurality of marks 26c may be any as long as they can indicate differences in the plurality of grooves 29, and may include numbers, letters, and symbols. Alternatively, the plurality of marks 26c may include one or more recesses.
１０…エアモータ
２０…調速機
２１…ガバナロッド
２２…ガバナバルブ
２３…スプリング（付勢手段）
２４…ガバナボディ
２５…鋼球（押圧手段）
２６…ストッパ（調節手段）
２６ｂ…第２端面部
２７…ピン
２８…被係合部
２８１…第１被係合部
２８２…第２被係合部
２８３…第３被係合部
２８４…第４被係合部
２９…溝
２９１…第１溝
２９２…第２溝
２９３…第３溝
２９４…第４溝 DESCRIPTION OF SYMBOLS 10 ... Air motor 20 ... Speed-control 21 ... Governor rod 22 ... Governor valve 23 ... Spring (biasing means)
24: Governor body 25: Steel ball (pressing means)
26 ... stopper (adjustment means)
26b: second end surface portion 27: pin 28: engaged portion 281: first engaged portion 282: second engaged portion 283: third engaged portion 284: fourth engaged portion 29: groove 291 ... 1st groove 292 ... 2nd groove 293 ... 3rd groove 294 ... 4th groove

Claims (5)

  1. 　エアモータの回転速度を調節する、エアモータの調速機であって、前記エアモータの回転軸と一体的に回転するガバナロッドと、前記ガバナロッドの軸方向に沿って移動可能に設けられ、前記エアモータに対する圧縮ガスの供給流量を増減するガバナバルブと、前記軸方向に配設され、前記軸方向の一端部で前記ガバナバルブと当接し、前記供給流量が増大する開弁方向に前記ガバナバルブを付勢する付勢手段と、前記エアモータの回転速度が増大するに連れて増大する抗力を発生し、前記付勢手段が前記ガバナバルブを付勢する付勢力に抗して、前記供給流量が減少する閉弁方向に前記ガバナバルブを押圧する押圧手段と、前記付勢力を調節する調節手段とを備えるエアモータの調速機。 A governor of an air motor, which adjusts a rotational speed of the air motor, wherein the governor rod rotates integrally with the rotation shaft of the air motor, and is provided movably along the axial direction of the governor rod, and compressed gas for the air motor A governor valve for increasing or decreasing the supply flow rate, biasing means arranged in the axial direction, abutting on the governor valve at one end in the axial direction, and biasing the governor valve in a valve opening direction for increasing the supply flow rate; The drag force is generated to increase as the rotational speed of the air motor increases, and the bias means moves the governor valve in the closing direction in which the supply flow rate decreases against the biasing force that biases the governor valve. An air motor governor, comprising: pressing means for pressing; and adjustment means for adjusting the biasing force.
  2. 　前記調節手段は、前記ガバナロッドの軸方向に沿って移動可能に設けられ、前記付勢手段における、前記軸方向の他端部と当接するストッパと、前記ガバナロッドに装着され、前記ストッパと係合し、前記ストッパを前記軸方向の所定位置に位置決めする位置決め手段とを有し、前記ストッパは、前記位置決め手段に係合される複数の被係合部であって、前記軸方向の位置が互いに異なる複数の被係合部を有している請求項１に記載のエアモータの調速機。 The adjusting means is provided so as to be movable along the axial direction of the governor rod, and is attached to the stopper in the biasing means and in contact with the other end in the axial direction, and engaged with the stopper And positioning means for positioning the stopper at a predetermined position in the axial direction, the stoppers being a plurality of engaged portions engaged with the positioning means, the axial positions being different from each other The air motor governor according to claim 1, comprising a plurality of engaged portions.
  3. 　前記ストッパは、前記ガバナロッドと同軸に設けられており、前記ガバナロッドの軸心を中心として前記ガバナロッドに対して相対回転可能であり、前記複数の被係合部は、前記ガバナロッドの軸心と同心の円に沿って配設されている請求項２に記載のエアモータの調速機。 The stopper is provided coaxially with the governor rod, is rotatable relative to the governor rod about the axis of the governor rod, and the plurality of engaged portions are concentric with the axis of the governor rod. The air motor governor according to claim 2, which is disposed along a circle.
  4. 　前記ストッパは、前記閉弁方向に向いている端面部を有しており、前記複数の被係合部は、前記端面部に形成され前記軸方向の深さが互いに異なる複数の溝の底部である請求項２又は請求項３に記載のエアモータの調速機。 The stopper has an end surface facing in the valve closing direction, and the plurality of engaged portions are formed at the end surface and are bottoms of a plurality of grooves having different axial depths. The governor of an air motor according to claim 2 or claim 3.
  5. 　エアモータと、請求項１から請求項４のいずれか１項に記載のエアモータの調速機とを備えるエアツール。 An air tool comprising: an air motor; and a speed governor of the air motor according to any one of claims 1 to 4.
PCT/JP2017/042791 2017-11-20 2017-11-29 Speed governor for air motor, and air tool WO2019097733A1 (en)

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PH12020550659A PH12020550659A1 (en) 2017-11-20 2020-05-18 Speed governor for air motor, and air tool

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JP2008534308A (en) * 2005-04-05 2008-08-28 アトラス・コプコ・ツールス・アクチボラグ Pneumatic power tool with exhaust silencer
US20150158165A1 (en) * 2013-12-06 2015-06-11 Ingersoll-Rand Company Impact Tools With Speed Controllers

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CN111344113A (en) 2020-06-26
CN111344113B (en) 2023-05-16
JP6959641B2 (en) 2021-11-02
JP2019093456A (en) 2019-06-20

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