WO2012029754A1 - 負荷感応型磁気クラッチ装置 - Google Patents
負荷感応型磁気クラッチ装置 Download PDFInfo
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- WO2012029754A1 WO2012029754A1 PCT/JP2011/069555 JP2011069555W WO2012029754A1 WO 2012029754 A1 WO2012029754 A1 WO 2012029754A1 JP 2011069555 W JP2011069555 W JP 2011069555W WO 2012029754 A1 WO2012029754 A1 WO 2012029754A1
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- Prior art keywords
- clutch
- magnetic
- torque
- protrusion
- load
- Prior art date
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D27/00—Magnetically- or electrically- actuated clutches; Control or electric circuits therefor
- F16D27/14—Details
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D27/00—Magnetically- or electrically- actuated clutches; Control or electric circuits therefor
- F16D27/01—Magnetically- or electrically- actuated clutches; Control or electric circuits therefor with permanent magnets
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
- B66D3/00—Portable or mobile lifting or hauling appliances
- B66D3/12—Chain or like hand-operated tackles with or without power transmission gearing between operating member and lifting rope, chain or cable
- B66D3/16—Chain or like hand-operated tackles with or without power transmission gearing between operating member and lifting rope, chain or cable operated by an endless chain passing over a pulley or a sprocket
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D11/00—Clutches in which the members have interengaging parts
- F16D11/14—Clutches in which the members have interengaging parts with clutching members movable only axially
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D43/00—Automatic clutches
- F16D43/02—Automatic clutches actuated entirely mechanically
- F16D43/20—Automatic clutches actuated entirely mechanically controlled by torque, e.g. overload-release clutches, slip-clutches with means by which torque varies the clutching pressure
- F16D43/202—Automatic clutches actuated entirely mechanically controlled by torque, e.g. overload-release clutches, slip-clutches with means by which torque varies the clutching pressure of the ratchet type
- F16D43/2022—Automatic clutches actuated entirely mechanically controlled by torque, e.g. overload-release clutches, slip-clutches with means by which torque varies the clutching pressure of the ratchet type with at least one part moving axially between engagement and disengagement
- F16D43/2024—Automatic clutches actuated entirely mechanically controlled by torque, e.g. overload-release clutches, slip-clutches with means by which torque varies the clutching pressure of the ratchet type with at least one part moving axially between engagement and disengagement the axially moving part being coaxial with the rotation, e.g. a gear with face teeth
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H3/00—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion
- F16H3/44—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion using gears having orbital motion
- F16H3/46—Gearings having only two central gears, connected by orbital gears
- F16H3/48—Gearings having only two central gears, connected by orbital gears with single orbital gears or pairs of rigidly-connected orbital gears
- F16H3/52—Gearings having only two central gears, connected by orbital gears with single orbital gears or pairs of rigidly-connected orbital gears comprising orbital spur gears
- F16H3/54—Gearings having only two central gears, connected by orbital gears with single orbital gears or pairs of rigidly-connected orbital gears comprising orbital spur gears one of the central gears being internally toothed and the other externally toothed
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K49/00—Dynamo-electric clutches; Dynamo-electric brakes
- H02K49/10—Dynamo-electric clutches; Dynamo-electric brakes of the permanent-magnet type
- H02K49/104—Magnetic couplings consisting of only two coaxial rotary elements, i.e. the driving element and the driven element
- H02K49/106—Magnetic couplings consisting of only two coaxial rotary elements, i.e. the driving element and the driven element with a radial air gap
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D23/00—Details of mechanically-actuated clutches not specific for one distinct type
- F16D23/12—Mechanical clutch-actuating mechanisms arranged outside the clutch as such
- F16D2023/123—Clutch actuation by cams, ramps or ball-screw mechanisms
Definitions
- the present invention relates to a load-sensitive magnetic clutch device that transmits rotational torque between two rotating bodies by a magnetic attractive force.
- the magnetic clutch device is When a load torque exceeding a preset value acts between the output rotation means and the low torque rotation means, the output rotation means is engaged with the high torque rotation means by sliding the output rotation means, and the high load transmission path When the torque transmission path is switched to and the load torque falls below the magnetic attractive force between the magnetic pole and the side magnetic body, the magnetic pole of the output rotating means moves to a position facing the tooth-shaped magnetic body of the low torque rotating means.
- the torque transmission path can be switched to the load transmission path, and the magnetic clutch can be switched automatically as the load torque increases or decreases.
- An object of the present invention is to provide a load-sensitive magnetic clutch device capable of preventing the occurrence of clutch return in which the load torque transmission path of a clutch is switched from a high load transmission path to a low load transmission path.
- a magnetic pole rotator having magnetic poles arranged on a circumference and forming an output rotating means having a clutch protrusion of an occlusal clutch at an end; and rotating around the same rotational axis as the magnetic pole rotator;
- a yoke rotor that forms a low-torque input means having a tooth profile portion that is arranged so that the tooth tips face each other, and that includes a tooth profile magnetic body that transmits torque by the magnetic pole rotor and a magnetic attraction force;
- High torque input means having a clutch engaging portion of an occlusal clutch that rotates on the same rotation axis and engages with a clutch protrusion provided on the output rotating means;
- the clutch protrusion is made of a magnetic material, and the clutch engaging portion has a clutch holding magnetic material to which the clutch protrusion is attracted by magnetic force, and exceeds the torque that can be transmitted between the magnetic pole rotating body and the low torque input means.
- a hollow disk-shaped side magnetic body attached to the yoke rotating body is provided on a side of the row of the tooth-shaped magnetic bodies where the high torque input means is disposed, and the high torque input is provided.
- the clutch engaging portion of the means has a forward torque transmission side surface that engages with the clutch protrusion during forward rotation of the high torque input means, and a reverse torque transmission side surface that engages with the clutch protrusion during reverse rotation. It is characterized by.
- the clutch holding magnetic body has an occlusal clutch disengagement portion that reduces an adsorption force due to a magnetic force between the clutch protrusion and the clutch holding magnetic body at an intermediate portion between the forward torque transmission side surface and the reverse torque transmission side surface. It is characterized by having.
- the occlusal clutch disengagement portion is provided at a central portion of the clutch holding magnetic body, and is a clutch disengagement inclined surface that reduces the attractive force due to the magnetic force between the clutch protrusion and the clutch holding magnetic body.
- the occlusion clutch disengagement part is an occlusion clutch disengagement protrusion that abuts on the clutch protrusion and separates the adsorption by the magnetic force between the clutch protrusion and the clutch holding magnetic body.
- the clutch engagement part is configured such that the clutch holding magnetic body is disposed between either the forward rotation torque transmission side surface and the occlusion clutch disengagement portion or between the reverse rotation torque transmission side surface and the engagement clutch disengagement portion. It is characterized by that.
- a magnetic pole rotating body having magnetic poles arranged on the circumference and forming an output rotating means having a clutch protrusion of an occlusion clutch at an end, and rotating on the same rotational axis as the magnetic pole rotating body
- a yoke forming a low-torque input means having a tooth-shaped portion that is arranged so that the magnetic pole and the tooth tip face each other and having a tooth-shaped magnetic body that transmits torque due to magnetic attraction force with the magnetic pole rotating body Since it was set as the structure which provided the high torque input means which has a clutch engaging part of the occlusion clutch which rotates with a rotary body and the said same rotating shaft center, and engages with the clutch protrusion provided in the said output rotation means, it preset When a load torque exceeding the rotational torque acts between the output rotating means and the low torque rotating means, the output rotating means slides by a predetermined amount in the direction of the rotation axis, and transmission of the rotational torque is transmitted between the output rotating means and the low torque
- the hollow magnetic plate-like side magnetic body attached to the yoke rotating body is provided on the side of the row of the tooth-shaped magnetic bodies on the side where the high torque input means is disposed, the load torque As the output increases, the output rotating means can be slid in the direction of the high torque means, and the clutch protrusion can be engaged with the clutch engaging portion, so that the low load transmission can be reliably switched to the high load transmission.
- the high torque input means has a torque transmission side surface at the time of forward rotation and a torque transmission side surface at the time of reverse rotation, it is possible to appropriately select an appropriate clutch engagement for each operation during the forward rotation operation and the reverse rotation operation. I can do it.
- the clutch holding magnetic body is provided with the occlusal clutch disengaging part, when the torque between the output rotation means and the high torque input means decreases, the operation of switching the output rotation means from the high torque input means to the low torque input means, By reversing the high torque input means, the clutch protrusion held by the clutch holding magnetic body is moved relative to the occlusion clutch disengagement portion, reducing the adsorption force between the clutch protrusion and the clutch holding magnetic body, and the magnetic pole and tooth profile magnetism.
- the output rotating means can be switched to transmission from the high torque input means to the low torque input means by the magnetic force acting between the tooth profile portions of the body, and the clutch can be switched to the mode that smoothly transmits the low load.
- the output rotation device is lowered from the high torque input device.
- the clutch protrusion is brought into contact with the engagement clutch release protrusion, and the engagement clutch is held in the clutch holding magnetic body. Therefore, the output rotation means can be reliably switched from the high torque input means to the low torque input means and can be smoothly switched to the mode in which the low load is transmitted.
- the clutch holding magnetic body is disposed between the torque transmission side surface during normal rotation and the engagement clutch disengagement part or between the torque transmission side surface during reverse rotation and the engagement clutch disengagement part, the forward rotation operation or reverse operation is performed.
- the occlusal clutch holding function is exhibited only during either operation, and the occlusal clutch holding function is not performed during the other operation, and the torque transmission path is automatically changed to the low load torque transmission path when the load becomes lower than the specified load torque. Depending on the application, it can be selected as appropriate.
- FIG. 1 is an overall configuration diagram of a load-sensitive magnetic clutch device of the present invention.
- FIG. 2 is an enlarged configuration explanatory view showing the low torque input means, yoke rotor, side magnetic body, and magnetic pole rotor of FIG. 1.
- Explanatory drawing explanatory drawing which shows the high torque input means of FIG.
- A Explanatory diagram showing a state of transmitting a low load (low load transmission mode)
- B Expansive configuration explanatory diagram showing low torque input means, yoke rotor, side magnetic body, magnetic pole rotor, and clutch protrusion .
- 1 is a non-magnetic hollow shaft-shaped input member fixed to a rotational torque input means 6 described later
- 2 is a high torque input means connected to the rotational torque input means 6
- 3 is a high torque input means.
- 3 is an engaging recess that constitutes an engagement portion for torque transmission of the occlusal clutch provided at 2, and includes an engagement recess (clutch engagement portion) that engages with a clutch protrusion 16 of the occlusion clutch, which will be described later.
- the high-torque input means 2 has a forward-rotation torque transmission side surface 3a that engages with the clutch protrusion 16 during forward rotation and a reverse-rotation torque transmission side surface 3b that engages with the clutch protrusion 16 during reverse rotation.
- Reference numeral 4 denotes a clutch holding magnetic body which is provided on the bottom surface of the engaging recess 3 and attracts a clutch protrusion 16 which will be described later.
- the clutch protrusion 16 is made of a ferromagnetic material excited by the permanent magnet 15.
- the clutch protrusion 16 moves to the engagement recess 3 side of the high torque input means 2 in the clutch switching operation described later, the clutch protrusion 16 is attracted to the clutch holding magnetic body 4. , Retained. It is preferable that the clutch protrusion 16 and the clutch holding magnetic body are attracted in a state having an air gap without being in close contact with each other in the attracted state. As shown in FIG.
- the clutch holding magnetic body 4 is arranged on only one side of the forward rotation torque transmission side surface 3a and the reverse rotation torque transmission side surface 3b, but depending on the type of load to be operated, As shown in FIG. 7, clutch holding magnetic bodies 4a and 4b can be disposed on both sides of the forward rotation torque transmission side surface 3a and the reverse rotation torque transmission side surface.
- the high torque input means 2 is made of a nonmagnetic material except for the clutch holding magnetic material 4.
- 4 a is a clutch holding magnetic body having a clutch disengagement inclined surface 4 a 1 at the center (clutch disengagement portion 3 c), and during the operation of switching the clutch from the mode for transmitting a high load to the mode for transmitting a low load, the increased both the air gap of the tip and the clutch holding magnetic body 4a of the clutch projections 16 in the clutch separating inclined surfaces 4a 1 gradually by relatively rotating, the clutch projections 16 of the suction force of the clutch holding magnetic body 4a It has the effect
- the clutch disengagement inclined surface 4a 1 is used when the load torque acting between the magnetic pole rotating body 14 and the yoke rotating body 12 of the output rotating means 17 described later decreases from a high load torque to a low load torque. Is switched to torque transmission from the high torque input means 2 to the low torque input means 11, by rotating the high torque input means 2 in the direction opposite to the previous rotation direction, as shown in FIG. During forward rotation, the clutch protrusion 16 adsorbed on the clutch holding magnetic body 4a on the forward rotation torque transmission side surface 3a is relatively moved from the forward rotation torque transmission side surface 3a to the reverse rotation torque transmission side surface 3b.
- the spacing of the tip and the clutch holding magnetic body 4a of the clutch projections 16, the enlarged clutch separating inclined surfaces 4a 1, Eagya' the clutch projections 16 and the clutch holding magnetic body 4a Increase, the clutch return by suction force of the clutch holding magnetic body 4a is eliminated, it has the effect of switching the magnetic clutch in the low load transfer mode.
- the clutch protrusion 16 adsorbed to the clutch holding magnetic body 4b on the reverse torque transmission side surface 3b is moved from the reverse torque transmission side surface toward the normal rotation torque transmission side surface.
- Reference numeral 16a denotes a clutch protrusion that contacts the torque transmission side surface 3a during forward rotation and transmits torque.
- 16b indicates a clutch protrusion that is disengaged from the engagement recess 3.
- Reference numeral 16c denotes a clutch protrusion that contacts the torque transmission side surface 3b during reverse rotation and transmits torque.
- the clutch protrusion 16 slides again into the engagement recess 3 and comes into contact with the forward rotation torque transmission side surface 3a or the reverse rotation torque transmission side surface 3b depending on the rotation operation direction. Transmits rotational torque.
- reference numeral 5 denotes a clutch disengagement projection provided at an intermediate portion between the forward rotation torque transmission side surface 3a and the reverse rotation torque transmission side surface 3b of the engagement recess 3, and the forward rotation disengagement inclined surface 5a. It has an inclined surface 5b for reverse separation.
- the clutch disengagement protrusion 5 is relatively moved in the direction of the clutch disengagement protrusion 5 by rotating the high torque input means 2 in the direction opposite to the previous rotation direction. By this movement, the clutch protrusion 16 attracted to the clutch holding magnetic body 4 comes into contact with the forward rotation releasing inclined surface 5a or the reverse rotation releasing inclined surface 5b of the releasing protrusion 5, and the clutch protrusion 16 is made to hold the clutch holding magnet.
- Reference numeral 16a denotes a clutch protrusion that contacts the torque transmission side surface 3a during normal rotation and transmits torque.
- Reference numeral 16b denotes a clutch protrusion which is disengaged from the clutch holding magnetic body 4.
- Reference numeral 16c denotes a clutch protrusion that contacts the torque transmission side surface 3b during reverse rotation and transmits torque.
- reference numeral 6 denotes a rotational torque input means, which is fixedly connected to the input member 1 and the high torque input means 2 by a connecting means, and is supported on the outer peripheral frame 20 together with the high torque input means 2 by a bearing 19e.
- a hand wheel used for a manual chain block is illustrated, but any means for inputting torque such as a pulley for a flat belt or a gear may be used.
- 7 is a planetary gear mechanism acting as a speed increasing mechanism
- 7a is a planetary carrier connected to the input member 1
- 7b is a planetary carrier that forms a pair with the planetary carrier 7a
- 7c is rotatably supported by the planetary carriers 7a and 7b.
- the planetary gear 7d is a planetary gear shaft implanted in the planetary carriers 7a and 7b, and the planetary gear 7c is supported by a bearing
- 8 is a ring gear in which the planetary gear 7c is inscribed and 9 is provided on the sun gear shaft 10.
- the sun gear 10 is a sun gear shaft that is an output shaft of the speed increasing mechanism.
- the planetary gear 7c is externally meshed with the sun gear 9, is meshed internally with the ring gear 8, accelerates the rotation of the planetary carrier 7a, and rotates the sun gear shaft 10 at a high speed.
- 11 is a low torque input means that is connected to the sun gear shaft and rotates at a high speed with respect to the rotational torque input means 6 at a speed increasing ratio of the planetary gear mechanism, and 11a is a boss portion of the low torque input means.
- the low torque input means 11 is supported by a bearing 19b so that the boss portion 11a can rotate and slide axially with respect to the outer periphery of the boss portion 17a of the output rotation means 17.
- a yoke rotor 12 is provided on the outer periphery of the boss portion 11a of the low torque input means 11 and has a tooth-shaped yoke (tooth-shaped magnetic body) 12a having a plurality of tooth tips arranged in two rows on the circumference. , 12a.
- the yoke rotor 12 is preferably a soft magnetic material.
- 13a is a side surface of one tooth-shaped yoke 12a and a doughnut-shaped side magnetic body extrapolated to the boss portion 11a of the low torque input means 11, and 13b is a low torque on the side surface of the other tooth-shaped yoke 12a. This is a donut disk-shaped side magnetic body extrapolated to the boss portion 11 a of the input means 11.
- the magnetic pole 14 is a magnetic pole rotating body having magnetic poles 14a and 14a arranged in two rows on the circumference.
- the magnetic pole 14a is disposed opposite to the outer periphery of the tooth tip row of the tooth-shaped yoke 12a.
- Reference numeral 15 denotes a donut disk-shaped permanent magnet provided between the pair of magnetic poles 14a, 14a, one side having an N pole and the other side having an S pole.
- the magnetic poles 14a, 14a are fixed to the side surface of the donut disk-shaped permanent magnet 15, and a plurality of tooth-shaped portions 14b, 14b are arranged on the inner periphery of each magnetic pole 14a, 14a.
- the N pole or S pole is excited at the tooth tip.
- the magnetic pole rotating body 14 and the permanent magnet 15 are fixed to the output rotating means 17.
- Numeral 16 is a clutch protrusion which is made of a ferromagnetic material and forms an occlusion clutch by being engaged with and disengaged from the engagement recess 3.
- the clutch protrusion 16 is provided so as to protrude from the side surface of the magnetic pole rotating body 14 of the output rotating means 17 toward the engaging recess 3 so as to be excited by the permanent magnet 15, and is provided in the high torque input means 2 at a high load. It engages with the joint recess 3 and is attracted to the clutch holding magnetic body 4 with an air gap.
- Reference numeral 17 denotes an output rotating means including the magnetic pole rotating body 14 having the permanent magnet 15 and the clutch protrusion 16, and 17a denotes a boss portion of the output rotating means 17.
- a spline 17b is provided on the inner periphery of the boss portion 17a of the output rotating means 17, and is splined with a spline 18a provided on the output shaft 18, and rotates on the same rotational axis 18b as the output shaft 18. While rotating torque is transmitted from the rotating means 17 to the output shaft 18, the output rotating means 17 is supported so as to be slidable in the axial direction of the output shaft 18.
- the output rotating means 17 is made of a non-magnetic material other than the magnetic pole rotating body 14, the permanent magnet 15, and the clutch protrusion 16.
- a bearing 19a is extrapolated to the output shaft 18 and pivotally supports the rotational torque input means 6 together with the high torque input means 2
- 19b is a bearing extrapolated to the boss portion 17a of the output rotating means 17 and pivotally supports the low torque input member 11.
- 19c are bearings that support the input member 1 together with the planetary carrier 7a, and the output shaft 18 is supported on the frame by bearings 19d and 19e.
- Reference numeral 20 denotes an outer peripheral frame.
- the tooth tip of the tooth shape shape yoke 12a of the low torque input means 11 and the magnetic pole 14a provided on the output rotation means 17 The tooth tips of the tooth shape portion 14b face each other, and the tooth shape shape portion 14b of the magnetic pole 14a excited by the permanent magnet 15 and the tooth shape shape yoke 12a provided in the low torque input means 11 are both tooth shape shapes.
- a magnetic circuit is formed through the air gap between the tooth tips of the part, and a strong magnetic attraction force is generated between both rotating means.
- the component force in the direction of the rotational axis of the attractive force due to the magnetic force of the magnetic pole 14a and the side magnetic bodies 13a and 13b increases.
- the component force in the direction of the rotational axis of the attractive force due to the magnetic force of the magnetic pole 14a and the side magnetic bodies 13a and 13b is greater than the component force in the direction of the rotational axis of the attractive force due to the magnetic force between the magnetic pole 14a and the tooth-shaped yoke 12a.
- a magnetic circuit is formed between the bodies 13a and 13b, and the clutch protrusion 16 engages with the engagement recess 3 of the high torque input means 2 that rotates at the same speed as the rotational torque input means 6 and is attracted to the clutch holding magnetic body 4. Can be switched to high load low speed rotation.
- the clutch protrusion 16 When the magnetic pole 14a slides and rotates in a state facing the side magnetic bodies 13a and 13b, the clutch protrusion 16 is the forward torque transmission side surface 3a or the reverse torque transmission side surface of the engagement recess 3 of the high torque input means 2. 3b is engaged, the clutch protrusion 16 is attracted to the clutch holding magnetic body 4, and the output rotating member 17 rotates integrally with the high torque input means 2 at the same speed.
- the magnetic pole 14a and the tooth-shaped yoke 12a continuously rotate relative to each other, and when the tooth-shaped portion 14b of the magnetic pole 14a and the tooth-shaped portion of the tooth-shaped yoke 12a face each other,
- the thrust force is Minimal.
- the tooth tips of both the magnetic pole 14a and the tooth-shaped yoke 12a are attracted by a magnetic force, and the positions of the tooth tips coincide with each other in the circumferential direction. Since the magnetic circuit formed between the side magnetic bodies 13a and 13b is switched to a magnetic circuit that flows through the teeth of the tooth-shaped portion of the tooth-shaped yoke 12a, the attractive force due to the magnetic force of the magnetic pole 14a and the tooth-shaped yoke 12a.
- the component force in the direction of the rotation axis increases, the component force in the direction of the rotation axis of the attractive force due to the magnetic force of the magnetic pole 14a and the side magnetic bodies 13a, 13b decreases, and due to the magnetic force of the magnetic pole 14a and the tooth-shaped yoke 12a.
- the high torque input means 2 When switching from the high load transmission mode to the low load transmission mode, the high torque input means 2 is rotated in the direction opposite to the previous rotation direction by the rotational torque input means 6, as shown in FIG.
- the relative position of the clutch protrusion 16 is moved from the clutch protrusion 16a in contact with the forward torque transmission side surface 3a of the engaging recess 3 provided in the input means 2 to the clutch protrusion 16b in contact with the reverse torque transmission side surface 3b.
- the magnetic pole rotating body 14 slides to a position where the magnetic pole 14a faces the tooth-shaped yoke 12a of the low torque input means 11 and switches to the low load transmission mode, and the output shaft 18 rotates to the rotational torque input means 6 Compared to rotate at a high speed.
- the magnetic pole 14a provided in the output rotating means 17 and the tooth-shaped yoke 12a provided in the low torque input means 11 are relatively rotated by a load applied to the magnetic pole 14a of the output rotating means 17. Then, the thrust force generated by the magnetic force of the permanent magnet 15 is utilized to slide the magnetic pole 14a in the direction of the rotation axis so that the output rotation means 17 becomes the high torque input means 2, the clutch protrusion 16 and the engagement recess 3 Since it is configured to be connected by an occlusal clutch, it is not necessary to provide a separate thrust conversion mechanism that was required in a conventionally known device, so the number of parts is small, the structure is simple, and the size and weight can be reduced.
- the product cost can be greatly reduced, and it is generated by the relative rotation of the magnetic pole 14a and the tooth-shaped yoke 12a at high load. Since the clutch protrusion 16 provided on the magnetic pole 14a is engaged with the high torque input means 2 by the last force, power transmission can be accurately performed even at high loads, and clutch switching can be performed at high speed. Can be done in response.
- the clutch holding magnetic body 4 is provided in the torque transmission engaging portion 3 of the high torque input means 2, the clutch protrusion 16 is operated when the output rotation means 17 is switched from the low torque input means 11 to the high torque input means 2. Is attracted to the clutch holding magnetic body 4, so that the switching operation by the clutch protrusion 16 can be performed quickly and reliably, and the clutch protrusion 16 is always attracted to the clutch holding magnetic body 4 during operation in the high load transmission mode. Therefore, it is possible to prevent the clutch from returning due to the fluctuation of the load acting on the clutch.
- the clutch holding magnetic body 4 is provided with the inclined surfaces 4a 1 and 4b 1 for detachment from the clutch protrusion 16, the torque between the output rotation means 17 and the high torque input means 2 is reduced, and the output rotation means 17 is increased.
- the operation of switching the transmission path from the torque input means 2 to the transmission to the low torque input means 11 is performed by rotating the high torque input means 2 in the direction opposite to the rotation direction so far, so that the clutch protrusion 16 is rotated forward.
- the output rotation means 17 is the high torque input means 2.
- the operation of switching the transmission path to the transmission from the low torque input means 11 to the high torque input means 2 is rotated in the direction opposite to the rotation direction so far, whereby the clutch protrusion 16 is rotated in the forward torque transmission side surface 3a.
- the rotation means 17 can be switched to the transmission position from the high torque input means 2 to the low torque input means 11 and smoothly switched to the low load transmission (high speed) mode.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Power Engineering (AREA)
- One-Way And Automatic Clutches, And Combinations Of Different Clutches (AREA)
- Mechanical Operated Clutches (AREA)
- Structure Of Transmissions (AREA)
Abstract
Description
出力回転手段と低トルク回転手段間に予め設定した値を超える負荷トルクが作用した場合に、出力回転手段をスライドすることで、出力回転手段を高トルク回転手段に係合し、高負荷伝達経路にトルク伝達経路を切換え、また、負荷トルクが磁極と側部磁性体間の磁気吸引力を下回ると、出力回転手段の磁極は低トルク回転手段の歯形磁性体と対向する位置に移動し、低負荷伝達経路にトルク伝達経路を切替えることができ、負荷トルクの増減に伴い磁気クラッチの切換を自動的に行うことができる構成のものであるが、
例えば、手動チェーンブロックに応用した場合では、荷の巻上げ操作時に、クラッチ部に加わる負荷トルクが、手動チェーンブロックに備わるメカニカルブレーキ(負荷作動ブレーキ)の作用によって減少することにより、低負荷伝達経路に切り換わるクラッチ戻りが発生するという課題を有していた。
円周上に列設された磁極を有し、端部に咬合クラッチのクラッチ突起を備える出力回転手段を形成する磁極回転体と、前記磁極回転体と同一回転軸心で回転し、前記磁極と歯先が対向するように列設される歯形形状部を有し、前記磁極回転体と磁気吸引力によるトルクを伝達する歯形磁性体を備える低トルク入力手段を形成する継鉄回転体と、前記同一回転軸心で回転し、前記出力回転手段に設けたクラッチ突起と係合する咬合クラッチのクラッチ係合部を有する高トルク入力手段を備え、
前記クラッチ突起は磁性体からなり、前記クラッチ係合部は前記クラッチ突起が磁力によって吸着するクラッチ保持磁性体を有し、前記磁極回転体と前記低トルク入力手段間で伝達可能なトルクを上まわる負荷トルクが作用することで、前記クラッチ突起が前記クラッチ保持磁性体に吸着することを特徴とする。
2 高トルク入力手段
3 係合凹部
3a 正転時トルク伝達側面
3b 逆転時トルク伝達側面
3c 咬合クラッチ離脱部
4 クラッチ保持磁性体
4a クラッチ離脱用傾斜面
5 クラッチ離脱用突起
5a 正転離脱用傾斜面
5b 逆転離脱用傾斜面
6 回転トルク入力手段
11 低トルク入力手段
12 継鉄回転体
12a 歯形形状継鉄
13 側部磁性体
14 磁極回転体
14a 磁極
14b 歯形形状部
16 クラッチ突起
17 出力回転手段
18 出力軸
18b 回転軸心
Claims (6)
- 円周上に列設された磁極を有し、端部に咬合クラッチのクラッチ突起を備える出力回転手段を形成する磁極回転体と、前記磁極回転体と同一回転軸心で回転し、前記磁極と歯先が対向するように列設される歯形形状部を有し、前記磁極回転体と磁気吸引力によるトルクを伝達する歯形磁性体を備える低トルク入力手段を形成する継鉄回転体と、前記同一回転軸心で回転し、前記出力回転手段に設けたクラッチ突起と係合する咬合クラッチのクラッチ係合部を有する高トルク入力手段を備え、
前記クラッチ突起は磁性体からなり、前記クラッチ係合部は前記クラッチ突起が磁力によって吸着するクラッチ保持磁性体を有し、前記磁極回転体と前記低トルク入力手段間で伝達可能なトルクを上まわる負荷トルクが作用することで、前記クラッチ突起が前記クラッチ保持磁性体に吸着することを特徴とする負荷感応型磁気クラッチ装置。 - 前記歯形磁性体の列の前記高トルク入力手段が配置された側の側方に、前記継鉄回転体に取着された中空円板状の側部磁性体を備え、前記高トルク入力手段の前記クラッチ係合部には、高トルク入力手段の正転時に前記クラッチ突起と係合する正転時トルク伝達側面と、逆転時に前記クラッチ突起と係合する逆転時トルク伝達側面を有することを特徴とする請求項1記載の負荷感応型磁気クラッチ装置。
- 前記クラッチ保持磁性体は、前記正転時トルク伝達側面と逆転時トルク伝達側面の中間部に、前記クラッチ突起と前記クラッチ保持磁性体間の磁力による吸着力を減少する咬合クラッチ離脱部を有することを特徴とする請求項2記載の負荷感応型磁気クラッチ装置。
- 前記咬合クラッチ離脱部は、クラッチ保持磁性体の中央部に設けられ、前記クラッチ突起とクラッチ保持磁性体との磁力による吸着力を低減するクラッチ離脱用傾斜面であることを特徴とする請求項3記載の負荷感応型磁気クラッチ装置。
- 前記咬合クラッチ離脱部は、前記クラッチ突起と当接してクラッチ突起とクラッチ保持磁性体との磁力による吸着を離脱させる咬合クラッチ離脱用突起を有することを特徴とする請求項3記載の負荷感応型磁気クラッチ装置。
- 前記クラッチ係合部は、前記正転時トルク伝達側面と前記クラッチ離脱部間、または逆転時トルク伝達側面と前記咬合クラッチ離脱部間のいずれか一方にのみ前記クラッチ保持磁性体を配置したことを特徴とする請求項1または2記載の負荷感応型磁気クラッチ装置。
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GB201101605D0 (en) * | 2011-01-31 | 2011-03-16 | Evolution Power Tools Ltd | Power take off coupling etc |
CN104343902B (zh) * | 2013-08-06 | 2017-05-31 | 苏州宝时得电动工具有限公司 | 自动变速传动机构及采用其的电动工具 |
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