WO2005061929A1 - リニアアクチュエータ - Google Patents
リニアアクチュエータ Download PDFInfo
- Publication number
- WO2005061929A1 WO2005061929A1 PCT/JP2004/019345 JP2004019345W WO2005061929A1 WO 2005061929 A1 WO2005061929 A1 WO 2005061929A1 JP 2004019345 W JP2004019345 W JP 2004019345W WO 2005061929 A1 WO2005061929 A1 WO 2005061929A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- shaft
- potentiometer
- linear actuator
- sensor
- bed
- Prior art date
Links
Classifications
-
- 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
- F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
- F16H25/18—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions
- F16H25/20—Screw mechanisms
- F16H25/2015—Means specially adapted for stopping actuators in the end position; Position sensing means
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/06—Means for converting reciprocating motion into rotary motion or vice versa
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T74/00—Machine element or mechanism
- Y10T74/18—Mechanical movements
- Y10T74/18568—Reciprocating or oscillating to or from alternating rotary
- Y10T74/18576—Reciprocating or oscillating to or from alternating rotary including screw and nut
Definitions
- the present invention relates to a linear actuator, and more particularly to an electric feed screw type linear actuator, for example, elevating a bed of a medical / care bed or tilting a bed of a back or a knee. It relates to things that are effective to use for slanting.
- the bed of the bed is moved up and down by an electric feed screw type linear actuator, and the bed of the back and knees is inclined in order to reduce the burden of sleeping on the patient. It has been implemented.
- a shaft having a male screw portion, a worm gear reduction device for transmitting the rotation of the motor to this shaft while reducing the speed, and a male screw portion of the shaft are screwed together.
- a one-way clutch that allows forward rotation of the shaft and inhibits reverse rotation.
- the moving cylinder moves up and down the bed of the bed, and is connected to the link that tilts the bed of the back and knees by means of a connector.
- Patent Document 1 JP-A-9-190225
- a linear actuator used for a medical care bed the user can arbitrarily set the position of the bed when moving the bed up and down or tilting the back or knee bed. It is common practice to install a position detecting device so that the position detecting device can be operated. In some cases, a potentiometer that converts the amount of rotation of the shaft into a voltage value is used in the position detecting device. The potentiometer is linked to a shaft provided on the shaft by a gear reduction device. [0005] In assembling the linear actuator, the work of aligning the origin of the moving cylinder and the potentiometer is performed in a separate process, and the moving cylinder and the potentiometer are adjusted to predetermined positions and voltage values.
- the driven gear of the potentiometer is coupled to the shaft of the shaft via the reduction gear of the gear reduction device, as in the case of V where the voltage value of the potentiometer is not shifted.
- the driven gear will rotate when it is engaged with the pinion, and the position accuracy will be checked again after assembling.
- the required workability is poor.
- a linear actuator according to the present invention is a shaft having a male screw portion, a worm gear reduction device for transmitting the rotation of the motor to the shaft by reducing the speed, and a shaft of the shaft screwed to the male screw portion.
- a linear actuator that includes a female screw member that moves forward and backward by forward and reverse rotation, a moving cylinder that is fixed to the female screw member and moves forward and backward with respect to the housing, and a position detection device that detects the position of the moving cylinder.
- the position detection device is characterized in that the detection of the position of the moving cylinder can be adjusted in the housing.
- the origin can be aligned between the moving cylinder and the position detection device in the housing.
- the position detection device can be accurately assembled with good workability to the linear actuator.
- the position detecting device is constituted by a potentiometer that converts the amount of rotation of the shaft into a voltage value, and is provided so as to be movable on the knob and the housing. Since the adjustment can be performed with high accuracy, the detection accuracy of the rotation amount of the shaft of the potentiometer can be improved.
- a drill connected to a pin rotating integrally with the shaft is provided on the sensor axis of the potentiometer. Prevents accidental rotation of each gear when the driven gear is engaged with the pinion by installing a driven gear and installing this potentiometer so that it can move in the axial direction or axial direction of the moving cylinder. Can be assembled with good accuracy.
- the driven gear can be engaged with the pinion only by sliding the potentiometer. Can be easily assembled to the linear actuator.
- FIG. 1 is a front view showing a main part of a bed for medical and nursing care using a linear actuator according to an embodiment of the present invention, wherein FIG. ) Indicates a standing state.
- FIG. 2 is a plan view showing a linear actuator according to an embodiment of the present invention.
- FIG. 3 is a front view.
- FIG. 4 (a)] is a front sectional view showing a mechanism section.
- FIG. 4 (b) is a front sectional view showing the support portion.
- FIG. 5 (a) is a cross-sectional view along the line aa of FIG. 3, and (b) is a cross-sectional view along the line b-b of FIG.
- FIG. 6 is a side sectional view taken along the line VI-VI of FIG. 4 (a).
- FIG. 7 is a partially omitted side sectional view taken along the line VII-VII in FIG. 4 (a).
- FIG. 8 is an exploded perspective view of a potentiometer sensor installation section viewed from a motor mounting section side.
- FIG. 9 is a front view of a potentiometer sensor installation part showing a potentiometer sensor assembling operation, and shows a state before assembling.
- FIG. 10 is a front view showing the same after assembling.
- the linear actuator is configured to raise and lower a bed on the back of a medical care bed (hereinafter, referred to as a bed). ing. That is, the housing 11 on the fixed end side of the linear actuator 10 is rotatably supported on the frame 2 of the bed 1 by the pivot 3 so as to be rotatable. The distal end of the movable cylinder 36 on the free end side is rotatably connected to a link 5 for raising and lowering a bed (hereinafter referred to as a bed) 4 at the back by a pivot 6. With the moving cylinder 36 of the linear actuator 10 shortened, the bed 4 is laid down horizontally as shown in FIG.
- the bed 1 is not limited to be configured so that the bed 4 is erected by the extension of the moving cylinder 36 of the linear actuator 10, but is also configured so that the bed 4 is erected by shortening the moving cylinder 36 of the linear actuator 10.
- the link mechanism may be used.
- the linear actuator 10 includes a housing 11, and as shown in FIG. 2, the housing 11 moves the housing 11 itself in the axial direction.
- the first divided body (hereinafter, referred to as first shell) 12 and the second divided body (hereinafter, referred to as second shell) 13 which are formed into two parts are combined to form a substantially cylindrical shape. I have.
- the first shell 12 and the second shell 13 are each formed in a substantially semi-cylindrical shape using resin, and the first shell 12 and the second shell 13 are fastened together in a state where they are assembled in the middle. 14 (see FIG. 5), and a metal band 16 is fitted to a fitting portion 15 formed on the outer periphery of the opening.
- Opening of the tip of the first shell 12 and the tip of the second shell 13 in the radial direction can be reliably prevented by the metal band 16.
- a connecting member 17 formed in a cylindrical shape is inserted and fixed in a direction orthogonal to the cylinder core, and the connecting member 17 holds the reactor 10 in a bed 1.
- a pivot 3 for rotatably supporting the frame 2 of the vehicle is horizontally supported.
- a support portion 18 and a mechanism portion 19 are formed respectively. ing.
- the supporting portion 18 of the housing 11 is supported by being sandwiched between the first shell 12 and the second shell 13 at one end of the reinforcing cylinder 20.
- the reinforcing cylinder 20 is an example of a material having high mechanical strength. Some iron is used to form a round pipe.
- One end of a support cylinder 21 is inserted through the inner periphery of the reinforcing cylinder 20 and supported.
- the support cylinder 21 is made of resin and is formed in a round pipe shape having an outer diameter equal to the inner diameter of the reinforcing cylinder 20.
- the reinforcing cylinder 20 is supported with its strength reinforced. Since the support tube 21 is reinforced by the reinforcing tube 20, the length of the support portion 18 of the housing 11 that forms the support tube 21 in the conventional example can be reduced. By reducing the length of the support portion 18, the universal load resistance of the housing 11 due to the load of the bedside force can be relatively improved. In addition, by reducing the size of the housing 11, the workability of resin molding of the first shell 12 and the second shell 13 can be improved, and deformation such as warpage can be improved. The sealing area between them can be set narrow.
- a pair of detent portions 22 for detenting the female screw member is provided, and the detent portions 22 are respectively laid over substantially the entire length.
- the two detent portions 22, 22 are each formed in an elongated key shape extending at a constant width and a constant height in the axial direction. Since the non-rotating portions 22, 22 can be formed at the same time as the resin molding of the support cylinder 21, the presence of the non-rotating portions 22, 22 does not increase the manufacturing cost of the linear actuator. What,
- a flange 23 projects from the outer periphery of the distal end of the support cylinder 21.
- the flange 23 has an end face on the support portion 18 side.
- the tips of the tubes 20 face each other.
- a cylindrical plug 24 having a flange on the outer periphery is fitted into the opening at the tip of the support cylinder 21, and a seal ring 25 is sandwiched between the contact surfaces of the plug 24 and the flange 23. It has been done.
- a seal ring 26 is also interposed between sliding contact surfaces between the inner peripheral surface of the plug 24 and the outer peripheral surface of the movable cylinder 36.
- a fastening cap 27 is attached to the outside of the plug 24, and the fastening cap 27 is configured to fasten the plug 24 and the seal rings 25 and 26 to the support cylinder 21 by engaging the flange 23. Being done.
- a shaft 30 is mounted on the center of the support cylinder 21.
- a male screw part 31 for feeding is formed on the outer periphery of a region corresponding to the support cylinder 21 of the shaft 30, and a nut 33 as a female screw member with a female screw part 32 screwed into the male screw part 31 is freely movable. Attached to.
- a detent portion 34 formed in a key groove shape is submerged, and both the detent portions 34, 34 are inside the support cylinder 21.
- the pair of rotation preventing portions 22 and 22 are fitted slidably in the axial direction on the pair of rotation preventing portions 22 and 22, respectively.
- the nut 33 slides in the axial direction in a state where the nut 33 is prevented from rotating by the rotation stoppers 22 and 34 on the support cylinder 21. Since the rotation preventing portions 22 and 22 are formed of resin together with the support cylinder 21, it is possible to prevent noise from being generated when the nut 33 slides with respect to the support cylinder 21.
- a connecting male screw portion 35a is formed on the outer peripheral surface of the nut 33, and a connecting female screw portion 35b formed on the inner peripheral surface of one end of the moving cylinder 36 is screwed into the connecting male screw portion 35a of the nut 33. Have been combined.
- the moving cylinder 36 is formed in a shape of a round pipe longer than the supporting cylinder 21, and has a distal end projecting forward from the plug 24 fitted to the supporting cylinder 21.
- the intermediate portion of the moving cylinder 36 is slidably supported by the plug 24, and the outer peripheral surface of the moving cylinder 36 and the inner peripheral surface of the plug 24 are sealed by a seal ring 26.
- a pair of long holes 37, 37 for connecting the moving cylinder 36 to the link 5 of the bed 1 extend in the axial direction at positions facing each other.
- a connecting member 38 for connecting to the link 5 is slidably fitted in the opening at the distal end of the moving cylinder 36.
- the connecting member 38 is formed in a cylindrical shape having an outer diameter substantially equal to the inner diameter of the moving cylinder 36, and has a pressing portion at an end on the protruding side so as to face a front end surface which is a load receiving surface of the moving cylinder 36.
- the flange 39 is formed in a cylindrical flange shape having an outer diameter substantially equal to the outer diameter of the movable cylinder 36.
- a long hole 40 is formed in the fitting portion of the connecting tool 38 in the radial direction so as to extend in the axial direction, and the long hole 40 is set so as to face the long holes 37 of the movable cylinder 36.
- a seal ring 41 is fitted to the fitting end of the connecting tool 38, and the seal ring 41 is set so as to seal between the outer peripheral surface of the connecting tool 38 and the inner peripheral surface of the movable cylinder 36.
- a tool insertion hole 42 is submerged on the center line of the protruding end surface of the connecting tool 38, and the connecting tool 38 is rotated by the tool inserted into the tool inserting hole 42, so that the elongated hole 40 and the movable cylinder are formed.
- the slots 37, 37 are aligned with each other. Then, the movable cylinder 36 is connected to the link 5 by inserting the outer force of the movable cylinder 36 into the elongated holes 37 and 37 of the movable cylinder 36 and the elongated hole 40 of the connecting member 38.
- the moving cylinder 36 pushes up the bed 4 since the end face of the flange 39 of the connecting tool 38 is pressed against the distal end face of the moving pipe 36, the connecting tool 38 is screwed to the moving pipe 36. Even if not, the driving force can be transmitted to the bed 4.
- a sealing ring fitting groove 43 is disposed on the mating surface of the first shell 12 so as to surround the mechanism portion 19 and is sunk.
- the seal ring 44 is fitted into the seal ring fitting groove 43.
- the seal ring 44 is formed in a ring shape surrounding the mechanism portion 19, and a portion corresponding to the support tube 21 has a circular ring-shaped support cylinder seal ring portion having an inner diameter equal to the outer diameter of the support tube 21. 45 are integrally formed. If the seal ring 44 fitted in the seal ring fitting groove 43 is sandwiched between the first shell 12 and the second shell 13 with the support cylinder seal ring portion 45 fitted on the outer periphery of the support cylinder 21.
- the seal ring 44 together with the support cylinder seal ring portion 45, seals the space inside the mechanism portion 19 of the housing 11 with external force. In this way, by sealing only the mechanical part 19 of the housing 11 which requires a minimum seal, the accuracy of the seal can be improved, and the seal ring fitting groove 43, the seal ring 44 and the support
- the seal structure of the cylinder seal ring portion 45 and the like, and the configurations of the first shell 12 and the second shell 13 can be simplified. Therefore, the manufacturing cost of the entire linear actuator 10 can be reduced while improving the sealing performance of the linear actuator 10.
- a motor mounting portion 46 formed integrally with the housing protrudes in an intermediate portion of the mechanism portion 19 of the first shell 12 in a direction opposite to the mating surface.
- the motor 47 is mounted on the motor mounting portion 46 such that the center line of the motor 47 is orthogonal to the mating surface of the first shell 12 and the second shell 13. That is, the housing 48 of the motor 47 is inserted into the motor mounting portion 46 with a force opposite to the mating surface, and is fastened to the first shell 12 by screws or the like.
- a terminal 50 protrudes from the brush holder 49 that covers the opening of the motor housing 48 so as to be orthogonal to the mating surface of the first shell 12 and the second shell 13.
- the terminal 50 includes a holder 51 formed by using an insulating resin and a plurality of terminal plates 52 held by the holder 51.
- the holder 51 is fixed to the brush holder 49. I have.
- Terminal 50 of the second shell 13 The female bra portion 53 is integrally formed at the facing portion so as to protrude to the opposite side of the mating surface, and the terminal 50 is fitted into the female bra portion 53 so as to be exposed. .
- the direct coupler 54 is integrally formed with the linear actuator 10. Since the direct coupler 54 can be assembled by assembling the first shell 12 and the second shell 13 in the middle, it is possible to reduce the number of parts and the number of assembling steps of the entire linear actuator. In addition, the manufacturing cost of the linear actuator can be reduced.
- the rotating shaft 55 of the motor 47 is inserted inside the mechanism 19 of the housing 11, and includes a first bearing 56 arranged on the first shell 12, It is supported at both ends by a second bearing 57 disposed on the two shells 13.
- a worm 58 is formed between the first bearing 56 and the second bearing 57 on the outer periphery of the rotating shaft 55, and the worm 58 is joined to a worm wheel 59 that is mounted on the shaft 30.
- the worm wheel 59 is spline-coupled to a portion of the shaft 30 adjacent to the male screw portion 31, so that the worm wheel 59 is slidable in the axial direction and integrally formed. It is joined so that it rotates.
- a female spline 60a is engraved on the inner peripheral surface of the shaft hole of the worm wheel 59
- a male spline 60b is engraved on a portion of the outer peripheral surface of the shaft 30 adjacent to the male screw portion 31.
- 60a and male spline 60b are splined together.
- a bearing installation portion 61 is formed in a portion of the mechanical portion 19 of the housing 11 closer to the connecting tool 17 than the form wheel 59 of the shaft 30.
- a deep groove ball bearing 62 is installed in the bearing installation section 61.
- the shaft 30 is rotatably supported by a deep groove ball bearing 62.
- the deep groove ball bearing 62 is large in size so that it can support not only the radial load of the shaft 30 but also the thrust load of the shaft 30, and the bearing installation part 61 slides on the outer peripheral surface of the outer race of the deep groove ball bearing 62.
- the radial rolling bearing that rotatably supports the shaft 30 is constituted by the deep groove ball bearing 62 having a large size, and is set so that it can slide on the outer peripheral surface.
- the thrust bearing that supports the thrust load of the shaft 30 can be omitted, the structure of the linear actuator 10 can be simplified, and the manufacturing cost can be reduced.
- a one-way clutch installation part 63 is formed adjacent to the bearing installation part 61 in the housing 11 and is continuous with the bearing installation part 61, and a one-way clutch 64 is installed in the one-way clutch installation part 63.
- the one-way clutch 64 includes a clutch case 65 having a bottomed cylindrical shape, and a plurality of rollers 66 housed in the clutch case 65 so as to roll freely on the outer peripheral surface of the shaft 30.
- the inner peripheral surface of the case 65 and the outer peripheral surface of the shaft 30 are wedge-shaped so as to connect the clutch case 65 and the shaft 30 when the shaft 30 rotates in one direction.
- the clutch case 65 of the one-way clutch 64 contacts only the outer race of the deep groove ball bearing 62!
- a portion of the housing 11 adjacent to the one-way clutch installation portion 63 is provided with a brake plate installation portion 67, and the brake plate installation portion 67 is provided with a base plate 68A, a brake plate 68B, and a brake pusher 68C that also exert a force on the connecting member 17 side. They are installed in order.
- the base plate 68A is formed in a substantially circular ring shape, and is prevented from rotating by the brake plate installation portion 67 by engaging a pair of engagement portions projecting from the outer periphery with the brake plate installation portion 67, respectively. .
- the brake plate 68B is formed in a substantially circular ring shape having a smaller diameter than the base plate 68A, and a plurality of engaging protrusions protruding from the main surface on the base plate side are respectively engaged with the respective engaging recesses of the base plate 68A. As a result, it is prevented from rotating by the base plate 68A, that is, the brake plate installation portion 67.
- the brake washer 68C has a substantially octagonal outer shape and is formed in a flat plate shape having a shaft through hole at the center, and fits into a receiving hole that is submerged in the brake plate side main surface of the clutch case 65 of the one-way clutch 64. As a result, it is prevented from rotating by the clutch case 65. Therefore, the braking surface is formed by the mating surface of the brake plate 68B and the brake washer 68C.
- a potentiometer sensor mounting portion 69 is formed on one side of the mechanical portion 19 of the housing 11 opposite to the bearing mounting portion 61 of the worm 58.
- the potentiometer sensor 70 is mounted on the potentiometer sensor It is installed in.
- a sensor shaft 71 of the potentiometer 70 is opposed to the worm 58, and a driven gear 72 is fixed to the sensor shaft 71 so as to rotate.
- a reduction gear shaft 73 is mounted parallel to a portion of the mechanism portion 19 of the housing 11 on the shaft 30 side of the potentiometer 70, and the reduction gear shaft 73 is a large-diameter reduction gear that rotates integrally with each other.
- a driven gear 72 is combined with the small-diameter reduction gear 75, and a pinion 76 that rotates integrally with the shaft 30 is combined with the large-diameter reduction gear 74.
- the p-on 76 is coaxially disposed on the worm wheel 59 and is integrally formed, and is spline-coupled to the shaft 30. Therefore, the rotation of the shaft 30 is transmitted to the sensor shaft 71 via the pinion 76, the large-diameter reduction gear 74, the small-diameter reduction gear 75, and the driven gear 72.
- the potentiometer 70 is configured to convert the amount of rotation of the sensor shaft 71 into a linear motion and convert it into a voltage magnitude.
- the linear actuator 10 is previously assembled to the bed 1 as shown in Fig. 1. That is, the Axis 3 is passed through the frame 2 of the bed 1 and through the connector 17 of the linear actuator 10, so that the linear actuator 10 is moved by the Axis 3 to the frame 2 of the bed 1.
- the pivot 6 on the bed 4 is passed through the coupling 38 on the moving cylinder 36 side of the bed 10
- the linear actuator 10 is pivoted on the bed 4. To be rotatably connected.
- the error in the distance between the frame 2 and the link 5 can be absorbed by the long holes 37, 37 formed in the moving cylinder 36 and the long hole 40 formed in the connecting member 38, so that the pivots 3 and 6 Can easily penetrate the connector 17 and the connector 38.
- the operator presses the operation button on the forward rotation side to raise the bed 4, thereby changing the motor 47 from the state shown in FIG.
- the driving force of the rotating shaft 55 is transmitted to the shaft 30 via the worm 58 and the worm wheel 59.
- the connection between the one-way clutch 64 and the shaft 30 is released, so that only the shaft 30 rotates forward.
- the control between the brake washer 68C fixed to the one-way clutch 64 and the brake plate 68B is performed. No power occurs.
- the shaft 30 is rotated forward by the motor 47, the nut 33 is advanced along the support tube 21, so that the moving tube 36 connected to the nut 33 is pushed out of the support tube 21.
- the detent mechanism prevents the moving cylinder 36 from rotating when the linear actuator 10 is not attached to the bed 1, thereby preventing the positional relationship between the potentiometer and the moving cylinder 36 from being deviated.
- the moving cylinder 36 is fixed to the bed 1 and becomes unnecessary.
- the forward rotation of the shaft 30 is transmitted to the sensor shaft 71 at a reduced speed via the pinion 76, the large-diameter reduction gear 74, the small-diameter reduction gear 75, and the driven gear 72.
- the number of rotations of the sensor shaft 71 is converted into a voltage value by the potentiometer 70 and transmitted to a controller (not shown) that controls the operation of the bed 1.
- the controller Upon detecting the potentiometer voltage corresponding to the predetermined upper limit position, the controller automatically stops the motor 47.
- the pin 76, the large-diameter reduction gear 74, the small-diameter reduction gear 75, the driven gear 72, and the potentiometer 70 are arranged near the worm wheel 59 and the deep groove ball bearing 62, and the pin 76 is connected to the shaft.
- the potentiometer sensor 70 can be prevented from being affected by the swing motion of the shaft 30, so that the potentiometer sensor 70 That is, the stroke amount of the movable cylinder 36 can be accurately detected.
- the load of the bed 4 of the bed 1 acts on the nut 33 as a force in the direction of retracting the nut 33 via the movable cylinder 36.
- the shaft 30 has a moving cylinder 36, that is, a load Rotational force Applied by the action of the female thread 32 of the nut 33 and the male thread 31 of the shaft 30 for feeding.
- the load-side reverse rotation acting force acts to connect the clutch case 65 to the shaft 30.
- a braking surface is formed by the mating surface with the detented brake plate 68B, and the shaft 30 is prevented from rotating in the reverse direction. Therefore, the linear actuator 10 can support the bed 4 while keeping the load raised.
- the one-way clutch 64 engages with the shaft 30 because the shaft 30 rotates in the reverse direction.
- the braking force between the brake plate 68B and the brake washer 68C causes the motor 47 to drive the shaft 30.
- the one-way clutch 64 is set to be smaller than the force, the one-way clutch 64 allows the shaft 30 to rotate in the reverse direction relative to the housing 11 by idling with respect to the housing 11. That is, when the shaft 30 rotates in the reverse direction with respect to the housing 11, the nut 33 is retracted along the support cylinder 21. Therefore, the movable cylinder 36 connected to the nut 33 is pulled into the support cylinder 21, The bedding 4 of the bed 1 connected to the connecting tool 37 is turned down.
- the reverse rotation of the shaft 30 is transmitted to the sensor shaft 71 at a reduced speed via the pinion 76, the large-diameter reduction gear 74, the small-diameter reduction gear 75, and the driven gear 72.
- the number of rotations of the sensor shaft 71 is converted into a voltage value by the potentiometer 70 and transmitted to a controller (not shown) that controls the operation of the bed 1.
- the controller Upon detecting the potentiometer voltage corresponding to the predetermined lower limit position, the controller automatically stops the motor 47.
- the load eg, patient weight
- the moving cylinder 36 is retracted by the nut 33.
- the load-side reverse rotation acting force does not act on the shaft 30.
- the load-side reverse rotation force is constantly applied to the shaft 30 while the bed 4 is lying down, the reverse rotation of the shaft 30 is prevented by the above-described action.
- FIG. 8 is an exploded perspective view of the potentiometer sensor installation section 69 before assembling, also viewing the force on the motor mounting section 46, and shows a state in which the left and right sides of FIGS.
- a driven gear 72 is mounted on the sensor shaft of the potentiometer 70, and a large-diameter reduction gear 74 and a small-diameter reduction gear 73 are integrally mounted on a reduction gear shaft 73 of a potentiometer 77. Gear 75 is attached.
- the potentiometer 70 is connected to a potentiometer signal force bra (not shown).
- the potentiometer 70 is housed in the holding recess 78 of the potentiometer 77.
- the first shell 12 in which the potentiometer 70 to which the driven gear 72 is attached, the potentiometer 77 to which the reduction gear is attached, and the force transfer cylinder 36 are previously adjusted to the origin position. Respectively.
- the guide pin 79 of the potentiometer 77 is slidably fitted in the guide groove 80 formed in the first shell 12 in a direction parallel to the shaft 30, and the potentiometer 77 is entirely worm wheel. It is brought to a position away from one 59. In this state, the large-diameter reduction gear 74 is not engaged with the pinion 76. In this state, when the driven gear 72 is rotated, the potential sensor 70 is adjusted to a predetermined origin voltage value.
- the large-diameter reduction gear 74 is engaged with the pinion 76. Is done. At this time, since the guide pin 79 is guided by the guide groove 80, the large-diameter reduction gear 74 can be linearly engaged with the pinion 76 without rotating. This After that, the screw 82 is inserted into the mounting hole 81 of the potentiometer 77, and screwed into the screw hole 83 formed in the first shell 12, thereby fixing the potentiometer 77 to the first shell 12. .
- the operation of positioning moving cylinder 36 and the operation of adjusting the voltage value of potentiometer sensor 70 can be performed continuously on first shell 12.
- the linear actuator is used for a bed for medical care and nursing care.
- the actuator according to the present invention is not limited to this, and may be used for automobile electrical components and the like. Can be applied.
- the present invention can be used when improving the workability of assembling a linear actuator equipped with a position detecting device.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Power Engineering (AREA)
- Transmission Devices (AREA)
- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/584,359 US20070144281A1 (en) | 2003-12-24 | 2004-12-24 | Linear actuator |
EP04807702.8A EP1701063B1 (en) | 2003-12-24 | 2004-12-24 | Linear actuator |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003428069A JP4633355B2 (ja) | 2003-12-24 | 2003-12-24 | リニアアクチュエータ |
JP2003-428069 | 2003-12-24 |
Publications (1)
Publication Number | Publication Date |
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WO2005061929A1 true WO2005061929A1 (ja) | 2005-07-07 |
Family
ID=34708920
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2004/019345 WO2005061929A1 (ja) | 2003-12-24 | 2004-12-24 | リニアアクチュエータ |
Country Status (5)
Country | Link |
---|---|
US (1) | US20070144281A1 (ja) |
EP (1) | EP1701063B1 (ja) |
JP (1) | JP4633355B2 (ja) |
CN (1) | CN100570176C (ja) |
WO (1) | WO2005061929A1 (ja) |
Families Citing this family (23)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2007037214A1 (ja) | 2005-09-28 | 2007-04-05 | Mitsuba Corporation | リニアアクチュエータ |
CN101490930B (zh) * | 2006-09-19 | 2012-09-05 | 三菱电机株式会社 | 致动器 |
DK2232100T3 (da) * | 2008-01-12 | 2013-01-02 | Linak As | Lineær aktuator |
CN101220854B (zh) * | 2008-01-24 | 2010-06-30 | 李芬 | 电动推杆 |
US20090249906A1 (en) * | 2008-04-06 | 2009-10-08 | Tung-Hsin Chen | Linear Actuator |
US7752932B2 (en) * | 2008-04-06 | 2010-07-13 | Hiwin Mikrosystem Corp. | Linear actuator |
US20100236342A1 (en) * | 2009-03-18 | 2010-09-23 | Hiwin Mikrosystem Corp. | Linear actuator |
GB0917693D0 (en) * | 2009-10-09 | 2009-11-25 | Goodrich Actuation Systems Ltd | Actuator arrangement |
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CA2693130C (en) * | 2010-02-25 | 2012-10-09 | The Procter & Gamble Company | Absorbent article with improved garment-like character |
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EP3457091B1 (en) | 2017-09-18 | 2023-04-19 | Ratier-Figeac SAS | Actuator position sensor mechanism |
JP7091207B2 (ja) * | 2018-09-21 | 2022-06-27 | マブチモーター株式会社 | 減速機付きモータ |
CN110778673B (zh) * | 2019-09-12 | 2023-05-26 | 浙江捷昌线性驱动科技股份有限公司 | 一种线性致动器的自锁装置和线性致动器 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH09190225A (ja) | 1996-01-09 | 1997-07-22 | Aichi Electric Co Ltd | 電動アクチュエータの駆動位置検出装置 |
JP2000188846A (ja) * | 1998-12-22 | 2000-07-04 | Ckd Corp | 電動アクチュエータ |
JP2000291768A (ja) * | 1999-04-02 | 2000-10-20 | Mitsuba Corp | アクチュエータ |
JP2003322233A (ja) * | 2002-04-26 | 2003-11-14 | Mitsuba Corp | アクチュエータ |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4307799A (en) * | 1979-12-05 | 1981-12-29 | Andco Actuator Products, Inc. | Linear actuator |
US4712441A (en) * | 1985-05-13 | 1987-12-15 | Brunswick Valve & Control, Inc. | Position controlled linear actuator |
US4931710A (en) * | 1988-04-05 | 1990-06-05 | Eaton Corporation | Servoactuator with feedback and method of calibrating |
US5388471A (en) * | 1993-10-12 | 1995-02-14 | Alliedsignal Inc. | Thrust bearing for an actuator driving a sensor device |
CN1144890A (zh) * | 1995-09-04 | 1997-03-12 | 西门子公司 | 伺服驱动装置 |
JP2933159B2 (ja) * | 1996-03-18 | 1999-08-09 | 株式会社椿本チエイン | 直線作動機のリミットスイッチ取付構造 |
US5809833A (en) * | 1996-09-24 | 1998-09-22 | Dana Corporation | Linear actuator |
JP4413288B2 (ja) * | 1998-03-12 | 2010-02-10 | 川田工業株式会社 | 電動式リニアアクチュエータ |
US6078249A (en) * | 1998-10-08 | 2000-06-20 | Wayne-Dalton Corp. | Screw-type potentiometer drive with a travel reset |
JP2003301912A (ja) * | 2002-04-11 | 2003-10-24 | Mitsuba Corp | アクチュエータ |
JP2003301913A (ja) * | 2002-04-12 | 2003-10-24 | Mitsuba Corp | アクチュエータ |
-
2003
- 2003-12-24 JP JP2003428069A patent/JP4633355B2/ja not_active Expired - Fee Related
-
2004
- 2004-12-24 US US10/584,359 patent/US20070144281A1/en not_active Abandoned
- 2004-12-24 EP EP04807702.8A patent/EP1701063B1/en not_active Expired - Fee Related
- 2004-12-24 CN CNB2004800387216A patent/CN100570176C/zh not_active Expired - Fee Related
- 2004-12-24 WO PCT/JP2004/019345 patent/WO2005061929A1/ja not_active Application Discontinuation
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH09190225A (ja) | 1996-01-09 | 1997-07-22 | Aichi Electric Co Ltd | 電動アクチュエータの駆動位置検出装置 |
JP2000188846A (ja) * | 1998-12-22 | 2000-07-04 | Ckd Corp | 電動アクチュエータ |
JP2000291768A (ja) * | 1999-04-02 | 2000-10-20 | Mitsuba Corp | アクチュエータ |
JP2003322233A (ja) * | 2002-04-26 | 2003-11-14 | Mitsuba Corp | アクチュエータ |
Non-Patent Citations (1)
Title |
---|
See also references of EP1701063A4 * |
Also Published As
Publication number | Publication date |
---|---|
JP4633355B2 (ja) | 2011-02-16 |
EP1701063A4 (en) | 2011-05-11 |
CN100570176C (zh) | 2009-12-16 |
CN1898484A (zh) | 2007-01-17 |
EP1701063A1 (en) | 2006-09-13 |
JP2005188571A (ja) | 2005-07-14 |
US20070144281A1 (en) | 2007-06-28 |
EP1701063B1 (en) | 2014-01-22 |
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