WO2016103355A1 - Actionneur électromagnétique - Google Patents

Actionneur électromagnétique Download PDF

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Publication number
WO2016103355A1
WO2016103355A1 PCT/JP2014/084099 JP2014084099W WO2016103355A1 WO 2016103355 A1 WO2016103355 A1 WO 2016103355A1 JP 2014084099 W JP2014084099 W JP 2014084099W WO 2016103355 A1 WO2016103355 A1 WO 2016103355A1
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WO
WIPO (PCT)
Prior art keywords
shaft
electromagnetic actuator
groove
groove portion
elastic body
Prior art date
Application number
PCT/JP2014/084099
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English (en)
Japanese (ja)
Inventor
菅原　済文
Original Assignee
三菱電機株式会社
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Publication date
Application filed by 三菱電機株式会社 filed Critical 三菱電機株式会社
Priority to PCT/JP2014/084099 priority Critical patent/WO2016103355A1/fr
Publication of WO2016103355A1 publication Critical patent/WO2016103355A1/fr

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/06—Electromagnets; Actuators including electromagnets
    • H01F7/08—Electromagnets; Actuators including electromagnets with armatures
    • H01F7/121—Guiding or setting position of armatures, e.g. retaining armatures in their end position
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/06—Electromagnets; Actuators including electromagnets
    • H01F7/08—Electromagnets; Actuators including electromagnets with armatures
    • H01F7/16—Rectilinearly-movable armatures

Definitions

  • the present invention relates to an electromagnetic actuator used in a cam switching mechanism for an engine valve.
  • the plunger is linearly moved by electromagnetic force generated by applying a voltage to the coil, and the tip of the shaft that linearly moves integrally with the plunger is pushed out from the actuator body. Moreover, the conventional electromagnetic actuator returns the plunger and the shaft to the original position by the elastic force of the return spring built in the actuator body by stopping the voltage application to the coil.
  • Patent Document 1 discloses an electromagnetic spool valve device that controls the pressure of a fluid using an electromagnetic actuator.
  • the electromagnetic spool valve device of Patent Document 1 includes an intermediate position holding mechanism that holds a spool that switches a communication state between the ports of the valve mechanism at an intermediate position.
  • the electromagnetic spool valve device of Patent Literature 1 uses the intermediate position holding mechanism to position and hold the spool at the stroke intermediate position reliably and with high accuracy.
  • a cam that operates an engine valve when the rotational speed of the internal combustion engine is high (so-called “high cam”) and a cam that operates the engine valve when the rotational speed is low (so-called “low cam”)
  • Electromagnetic actuators are also used for switching to).
  • the cam switching mechanism for switching between the high cam and the low cam has a mechanism (hereinafter referred to as “return mechanism”) that forcibly pushes back the tip of the shaft that is pushed out by the electromagnetic actuator.
  • a latch-type electromagnetic actuator has been developed in which the shaft is made of a magnetic material and a magnet is provided at the protruding position of the shaft.
  • the latch type electromagnetic actuator applies a voltage to the coil only when pushing out the shaft, and thereafter maintains the protruding state by the magnetic force of the magnet.
  • power consumption is reduced, and the load of the electromagnetic actuator is reduced by suppressing overcurrent from flowing through the coil in order to resist the force with which the return mechanism of the cam switching mechanism pushes back the shaft.
  • the latch-type electromagnetic actuator has a problem that the magnetic force of the magnet changes according to the temperature and the responsiveness of the shaft changes greatly. Further, since rare earth is used for the magnet, there is a problem that costs increase.
  • the present invention has been made in order to solve the above-described problems, and can realize a cam switching mechanism that reduces the load of the electromagnetic actuator while reducing power consumption, and the response of the shaft to temperature.
  • An object of the present invention is to provide an inexpensive electromagnetic actuator that can stabilize the performance.
  • An electromagnetic actuator is an electromagnetic actuator that reciprocates a shaft passed through a hollow portion of a housing between a first position and a second position in an axial direction, and is formed in a lateral hole opening that penetrates the shaft in a radial direction.
  • the electromagnetic actuator according to the present invention maintains the axial position of the shaft when the ball disposed in the opening portion of the lateral hole of the shaft enters the first groove portion and the second groove portion in a state where no voltage is applied to the coil.
  • a cam switching mechanism that reduces the load of the electromagnetic actuator while reducing power consumption can be realized.
  • the holding force is not generated by the magnet, the responsiveness of the operation of the shaft with respect to the temperature change can be stabilized and can be configured at low cost.
  • FIG. 1 (a) is a block diagram of the principal part at the time of high cam use of the cam switching mechanism which concerns on Embodiment 1 of this invention.
  • FIG. 1B is a cross-sectional view taken along the line A-A ′ shown in FIG.
  • FIG. 2A is a configuration diagram of a main part when the low cam is used in the cam switching mechanism according to Embodiment 1 of the present invention.
  • FIG. 2B is a cross-sectional view taken along line B-B ′ shown in FIG. It is explanatory drawing which shows the operation
  • FIG. 6A is a cross-sectional view of the main part in a state where the shaft of the electromagnetic actuator according to Embodiment 1 of the present invention is in the OFF position.
  • FIG. 6B is an enlarged view of a region surrounded by an ellipse I shown in FIG.
  • FIG. 7A is a cross-sectional view of the main part in a state where the shaft of the electromagnetic actuator according to Embodiment 1 of the present invention is between the OFF position and the ON position.
  • FIG. 6A is a cross-sectional view of the main part in a state where the shaft of the electromagnetic actuator according to Embodiment 1 of the present invention is between the OFF position and the ON position.
  • FIG. 7B is an enlarged view of a region surrounded by an ellipse I shown in FIG. Fig.8 (a) is sectional drawing of the principal part in the state which has the shaft of the electromagnetic actuator which concerns on Embodiment 1 of this invention in an ON position.
  • FIG. 8B is an enlarged view of a region surrounded by an ellipse I shown in FIG. Fig.9 (a) is sectional drawing of the principal part in the state which has the shaft of the electromagnetic actuator which concerns on Embodiment 2 of this invention in an OFF position.
  • FIG. 9B is an enlarged view of a region surrounded by an ellipse I shown in FIG. FIG.
  • FIG. 10A is a cross-sectional view of the main part in a state where the shaft of the electromagnetic actuator according to Embodiment 2 of the present invention is between the OFF position and the ON position.
  • FIG. 10B is an enlarged view of a region surrounded by an ellipse I shown in FIG. Fig.11 (a) is sectional drawing of the principal part in the state which has the shaft of the electromagnetic actuator which concerns on Embodiment 2 of this invention in an ON position.
  • FIG. 11B is an enlarged view of a region surrounded by an ellipse I shown in FIG.
  • FIG. 12A is a cross-sectional view of the main part in a state where the shaft of the electromagnetic actuator according to Embodiment 3 of the present invention is in the OFF position.
  • FIG. 12B is an enlarged view of a region surrounded by an ellipse I shown in FIG.
  • FIG. 13A is a cross-sectional view of the main part in a state where the shaft of the electromagnetic actuator according to Embodiment 3 of the present invention is between the OFF position and the ON position.
  • FIG. 13B is an enlarged view of a region surrounded by an ellipse I shown in FIG.
  • FIG. 14A is a cross-sectional view of the main part in a state where the shaft of the electromagnetic actuator according to Embodiment 3 of the present invention is in the ON position.
  • FIG. 14B is an enlarged view of a region surrounded by an ellipse I shown in FIG. It is sectional drawing of the housing which concerns on Embodiment 3 of this invention, a 1st ring, a 2nd ring, and a 3rd ring.
  • FIG. 1 and 2 show a cam switching mechanism for an engine valve.
  • Fig.1 (a) has shown the principal part of the cam switching mechanism at the time of high cam use.
  • FIG. 1B is a cross-sectional view taken along line AA ′ in FIG.
  • FIG. 2A shows a main part of the cam switching mechanism when the low cam is used.
  • FIG. 2B is a cross-sectional view taken along the line BB ′ in FIG.
  • a cam switching mechanism 100 using electromagnetic actuators 1a and 1b according to the first embodiment will be described with reference to FIGS.
  • the electromagnetic actuators 1a and 1b push out one end portion 141 of the shaft 14 from the housing 13 by supplying power from the connector 12 to the coil accommodated in the case 11.
  • the position in the axial direction of the shaft 14 at which the projection length L of the one end 141 from the housing 13 is the longest is referred to as an “ON position”.
  • the axial position of the shaft 14 at which the protrusion length L is the shortest is referred to as an “OFF position”.
  • FIG. 1A and FIG. 2A show a state in which the shafts 14 of the two electromagnetic actuators 1a and 1b are both in the OFF position.
  • Two cylindrical cam pieces 2a and 2b are arranged facing one end portion 141 of the shaft 14 of the electromagnetic actuators 1a and 1b.
  • Spiral grooves 3a and 3b are provided on the side peripheral portions of the cam pieces 2a and 2b.
  • the spiral groove 3a of one cam piece 2a and the spiral groove 3b of the other cam piece 2b are opposite to each other.
  • the taper surface which rises gently is formed in the terminal part inside the two spiral grooves 3a and 3b, respectively.
  • the return mechanism of the cam switching mechanism 100 is configured by the tapered surfaces of the spiral grooves 3a and 3b.
  • the distance between the electromagnetic actuators 1a, 1b and the cam pieces 2a, 2b is such that the one end 141 enters the spiral grooves 3a, 3b when the shaft 14 is in the ON position and the one end 141 when the shaft 14 is in the OFF position. Is set to an interval from the spiral grooves 3a and 3b.
  • a cam shaft 4 is inserted along the axis of the cam pieces 2a, 2b.
  • High cams 5a and 5b and low cams 6a and 6b are provided between the cam pieces 2a and 2b.
  • the high cams 5a and 5b and the low cams 6a and 6b are arranged close to each other.
  • a convex portion 51 is formed on the outer peripheral portion of the high cam 5b.
  • a convex portion 61 is formed on the outer peripheral portion of the low cam 6b.
  • the convex part 51 is formed in the outer peripheral part of the high cam 5a
  • the convex part 61 is formed in the outer peripheral part of the low cam 6a.
  • the convex portions 51 of the high cams 5a and 5b are higher in height than the convex portions 61 of the low cams 6a and 6b.
  • the cam part 7 is comprised by the cam pieces 2a and 2b, the high cams 5a and 5b, and the low cams 6a and 6b.
  • the cam portion 7 is spline-coupled to the camshaft 4, for example, and rotates integrally with the camshaft 4 around the camshaft 4.
  • the cam portion 7 is supported so as to be linearly movable with respect to the camshaft 4 along the axial direction of the camshaft 4.
  • Valves 8 a and 8 b are arranged around the cam portion 7.
  • Rocker rollers 10a and 10b are provided on the rocker arms 9a and 9b that support the valves 8a and 8b.
  • the valves 8a and 8b are pressed toward the camshaft 4 by a coil spring or the like (not shown), and the rocker rollers 10a and 10b are placed on one of the high cams 5a and 5b and the low cams 6a and 6b according to the linear movement position of the cam portion 7. It comes to contact.
  • the cam portion 7 rotates with the high cams 5a and 5b in contact with the rocker rollers 10a and 10b.
  • convex portions 51 are formed on the outer peripheral portions of the high cams 5a and 5b, and the rocker arms 9a and 9b rotate around the one end portion C by pressing the rocker rollers 10a and 10b according to the rotational position of the convex portion 51.
  • the valves 8a and 8b move linearly in the radial direction of the high cams 5a and 5b (direction substantially along the y-axis in the figure).
  • the cam portion 7 rotates with the low cams 6a and 6b in contact with the rocker rollers 10a and 10b.
  • convex portions 61 are formed on the outer peripheral portions of the low cams 6a and 6b, and the rocker arms 9a and 9b rotate around the one end portion C by pushing the rocker rollers 10a and 10b according to the rotational position of the convex portion 61.
  • the valves 8a and 8b move linearly in the radial direction of the low cams 6a and 6b (direction substantially along the y axis in the figure).
  • the cam portion 7 rotates in a state where the one end portion 141 of the shaft 14 enters the spiral groove 3b, the cam portion 7 moves in a certain direction along the axis of the camshaft 4 (the positive direction of the x axis in the figure).
  • the spiral groove 3b is provided so that the movement width of the cam portion 7 is substantially equal to the distance Lc between the center portions of the high cams 5a and 5b and the low cams 6a and 6b.
  • the cams for operating the valves 8a and 8b are switched from the high cams 5a and 5b to the low cams 6a and 6b.
  • the electromagnetic actuator 1a moves the shaft 14 from the OFF position to the ON position at the timing when the spiral groove 3a of the cam piece 2a comes directly below.
  • the one end portion 141 is pushed out and inserted into the spiral groove 3a.
  • FIG. 5 is a cross-sectional view of the main part of the electromagnetic actuator 1a in a state where the shaft 14 is in the OFF position.
  • a detailed configuration of the electromagnetic actuator 1a will be described with reference to FIG. Since the electromagnetic actuator 1b is configured in the same manner as the electromagnetic actuator 1a, illustration and description thereof are omitted.
  • a coil 16 is wound around the outer periphery of the cylindrical bobbin 15.
  • a terminal 17 electrically connected to the coil 16 is provided at one end of the bobbin 15.
  • the terminal 17 is accommodated in the connector 12 made of resin.
  • the side peripheral portions of the bobbin 15 and the coil 16 are covered with a cylindrical cover 18 integrated with the connector 12.
  • a cylindrical core 19 is inserted into and fixed to the inner periphery of the bobbin 15.
  • the openings at one end of the bobbin 15, the cover 18, and the core 19 are covered with a disk-shaped lid 20 integrated with the core 19.
  • An O-ring 21 is provided between the bobbin 15 and the cover 18 and the core 19 and the lid 20.
  • a housing 13 is provided on the other end side of the bobbin 15 and the cover 18.
  • the housing 13 has a cylindrical main body 131 and a flange 132 formed at one end of the main body 131, and the flange 132 is opposed to the bobbin 15 and the opening of the cover 18.
  • An O-ring 22 is provided between the bobbin 15 and the cover 18 and the flange portion 132. Further, an O-ring 23 is provided in the groove portion on the outer peripheral portion of the main body 131.
  • the outer periphery of the cover 18 is covered with the case 11, and the upper and lower opening ends of the case 11 are caulked so that the lid portion 20 and the flange portion 132 are held by the case 11.
  • a bracket 24 having a mounting hole 241 is provided on the outer peripheral portion of the case 11 so that it can be freely attached to an arbitrary place such as a casing of an internal combustion engine.
  • a cylindrical plunger 25 is inserted into the hollow portion of the core 19.
  • the plunger 25 is directly movable with respect to the core 19.
  • the other end portion 142 of the shaft 14 is fitted to the distal end portion of the plunger 25 so that the shaft 14 and the plunger 25 move linearly integrally.
  • the shaft 14 is inserted into the hollow portion of the housing 13, and one end portion 141 projects from the main body portion 131 of the housing 13.
  • a cylindrical ring 26 is installed in a space in which the inner peripheral portion of the housing 13 is expanded.
  • the shaft 14 passes through the inner periphery of the ring 26.
  • An annular protrusion 261 is formed on the inner peripheral portion of the ring 26.
  • the ring 26 is manufactured, for example, by scraping the inner peripheral portion from both end portions of a thick cylindrical metal member toward the central portion.
  • An annular second groove 27 is formed by the gap between the protrusion 261 and the stepped surface 133 of the inner peripheral portion of the housing 13.
  • a cylindrical boss 28 is installed on the inner peripheral portion of the housing 13 and the bobbin 15 adjacent to the ring 26.
  • the shaft 14 passes through the inner periphery of the boss 28.
  • An annular protrusion 281 is formed on the inner peripheral portion of the boss 28.
  • the boss 28 is manufactured, for example, by scraping the inner peripheral portion from both end portions of a thick cylindrical metal member toward the central portion.
  • An annular first groove 29 is formed by the gap between the protrusion 281 of the boss 28 and the protrusion 261 of the ring 26.
  • the step surface 133 of the housing 13 is suspended from the inner periphery of the housing 13, the protrusion 261 is suspended from the inner periphery of the ring 26, and the protrusion 281 is suspended from the inner periphery of the boss 28.
  • the first groove portion 29 and the second groove portion 27 are groove portions having a U-shaped cross section in which the wall portion is provided substantially perpendicular to the bottom portion of the groove.
  • a convex stopper 143 is formed on the side periphery of the shaft 14.
  • the stopper 143 is disposed between the protrusion 281 of the boss 28 and the protrusion 261 of the ring 26, and abuts against the protrusion 281 of the boss 28 when the shaft 14 is in the OFF position, so that the shaft 14 is excessively pressed. It has come to regulate the straight movement.
  • the plunger 25 abuts on the protrusion 281 of the boss 28 to restrict excessive linear movement of the shaft 14.
  • a horizontal hole 144 that penetrates the shaft 14 in the radial direction is formed at a position facing the ring 26 of the shaft 14.
  • Balls 30 and 31 are arranged in the openings of the horizontal holes 144, respectively.
  • An elastic body 32 is provided between the two balls 30 and 31. The balls 30 and 31 are pressed toward the outer ring 26 by the elastic force of the elastic body 32.
  • FIG. 5 shows an example in which the balls 30 and 31 are both spherical and the elastic body 32 is formed of a coil spring.
  • the balls 30 and 31 are pressed by the elastic body 32 so as to enter the first groove portion 29. Further, when the shaft 14 is in the ON position, the balls 30 and 31 are pressed by the elastic body 32 and enter the second groove portion 27.
  • FIG. 6A is a cross-sectional view of the main part of the electromagnetic actuator 1a in a state where the shaft 14 is in the OFF position.
  • FIG. 7A is a cross-sectional view of the electromagnetic actuator 1a in a state where the shaft 14 is between the OFF position and the ON position
  • FIG. 8A is an electromagnetic actuator 1a in a state where the shaft 14 is in the ON position.
  • FIGS. 6B, 7B, and 8B are enlarged views of regions surrounded by an ellipse I shown in FIGS. 6A, 7A, and 8A, respectively. is there.
  • the shaft 14 is moved by the force (the positive force in the y-axis in the figure) that the return mechanism of the cam switching mechanism 100 shown in FIGS. 1 to 4 pushes back the shaft 14.
  • the balls 30 and 31 are pushed back into the lateral hole 144 against the force of the elastic body 32 along the convex shape of the protrusion 261 from the second groove 27, and the balls 30 and 31 are moved in the first direction. 2 disengages from the groove 27.
  • the shaft 14 linearly moves from the ON position shown in FIG. 8 toward the OFF position, and the electromagnetic actuator 1a returns to the state shown in FIG. 6 through the state shown in FIG.
  • the electromagnetic actuator 1 a holds the shaft 14 in the OFF position by pressing the balls 30 and 31 in the first groove 29 with the elastic body 32 and enters the second groove 27.
  • the balls 14 are pressed by the elastic body 32 to hold the shaft 14 in the ON position.
  • the electromagnetic actuator 1a is used for the cam switching mechanism 100, the coil 16 is energized only during the period in which the shaft 14 is moved from the OFF position to the ON position, and power consumption can be reduced. Further, since it is not necessary to energize the coil 16 when the shaft 14 is in the ON position, the load on the electromagnetic actuator 1a can be reduced.
  • the electromagnetic actuator 1a is provided between the balls 30 and 31 and the plurality of balls 30 and 31 disposed in the opening of the lateral hole 144 that penetrates the shaft 14 in the radial direction.
  • An elastic body 32 that presses the balls 30 and 31 outward and an inner wall side of the hollow portion of the housing 13, and the balls 30 and 31 are pressed by the elastic body 32 when the shaft 14 is in the OFF position (first position).
  • the coil 16 is energized only during the period in which the shaft 14 is moved from the OFF position to the ON position, and power consumption can be reduced. Further, since it is not necessary to energize the coil 16 when the shaft 14 is in the ON position, the load on the electromagnetic actuator 1a can be reduced. Furthermore, the magnet for holding the position of the shaft 14 required for the latch type electromagnetic actuator is not required, the response of the shaft 14 to temperature can be stabilized, and the electromagnetic actuator 1a can be configured at low cost.
  • annular ring 26 is provided between the shaft 14 and the inner wall of the hollow portion of the housing 13, and a first groove portion 29 and a second groove portion 27 are formed by unevenness provided on the inner side of the ring 26.
  • the ring 26 in which the protrusion 261 is formed on the inner peripheral portion is manufactured as a separate member from the housing 13, and the ring 26 is expanded in the space where the inner periphery of the housing 13 is expanded.
  • the groove part is formed by installing. Thereby, the 1st groove part 29 and the 2nd groove part 27 can be formed more easily, and the manufacturing cost of the electromagnetic actuator 1a can be reduced.
  • the shapes of the balls 30 and 31 are not limited to spheres. It may be a non-spherical shape such as a spheroid.
  • the elastic body 32 is not limited to a coil spring. It may be an elastomer, an air spring or a liquid spring. However, it is preferable to use a coil spring from the viewpoint of stabilizing the response of the shaft 14 to temperature.
  • the balls 30 and 31 are only required to be arranged at the openings of the horizontal holes 144, and are not limited to two.
  • a plus sign-like hole in which two horizontal holes intersect each other may be provided in the shaft 14, and balls may be disposed in four openings.
  • the mechanism using the electromagnetic actuator 1a is not limited to the cam switching mechanism 100 for the engine valve. Similar to the cam switching mechanism 100, any mechanism may be used as long as it has a return mechanism that pushes the shaft 14 in the ON position back to the OFF position.
  • FIG. 9A is a cross-sectional view of the main part of the electromagnetic actuator 1a in a state where the shaft 14 is in the OFF position.
  • FIG. 10A is a cross-sectional view of the electromagnetic actuator 1a in a state where the shaft 14 is between the OFF position and the ON position
  • FIG. 11A is an electromagnetic actuator 1a in a state where the shaft 14 is in the ON position.
  • FIGS. 9B, 10B, and 11B are enlarged views of a region surrounded by an ellipse I shown in FIGS.
  • the first chamfered portion 262 and the second chamfered portion 263 are formed by chamfering the corner portion on the first groove portion 29 side and the corner portion on the second groove portion 27 side of the protrusion 261 provided on the ring 26.
  • the first chamfered portion 262 and the second chamfered portion 263 are so-called “C surfaces”.
  • the shape of the 1st chamfer part 262 and the 2nd chamfer part 263 is not limited to C surface. Any shape that can generate a force capable of fixing the shaft 14 to the OFF position side may be used. For example, an R shape may be used.
  • the electromagnetic actuator 1a configured as described above will be described.
  • the electromagnetic actuator 1a vibrates greatly during operation of the internal combustion engine. Therefore, it is desirable that the holding force for holding the shaft 14 in the OFF position and the ON position is strong enough to prevent unnecessary linear movement of the shaft 14 due to vibration of the electromagnetic actuator 1a.
  • the shaft 14 when the shaft 14 is in the OFF position (first position), the balls 30 and 31 pressed toward the first groove 29 by the elastic body 32 are the first.
  • the shaft 14 is held in the OFF position (first position) by contacting the first chamfered portion 262 chamfered at one corner of the protrusion 261 between the groove portion 29 and the second groove portion 27, and the shaft 14 is in the ON position.
  • the balls 30 and 31 pressed toward the second groove 27 by the elastic body 32 come into contact with the second chamfered portion 263 chamfered at the other corner of the protrusion 261.
  • the shaft 14 is held at the ON position (second position).
  • the axial force Fy1, Fy2 is applied to the shaft 14 by the forces F1, F2 that the elastic body 32 presses the balls 30, 31 against the first chamfered portion 262 or the second chamfered portion 263.
  • the holding force for holding the axial position of the shaft 14 is strengthened, and unnecessary linear movement of the shaft 14 due to vibration of the electromagnetic actuator 1a can be suppressed. Further, the positional accuracy of the shaft 14 can be increased.
  • FIG. 12A is a cross-sectional view of the main part of the electromagnetic actuator 1a in a state where the shaft 14 is in the OFF position.
  • FIG. 13A is a cross-sectional view of the electromagnetic actuator 1a in a state where the shaft 14 is between the OFF position and the ON position
  • FIG. 14A is an electromagnetic actuator 1a in a state where the shaft 14 is in the ON position.
  • FIGS. 12B, 13B, and 14B are enlarged views of a region surrounded by an ellipse I shown in FIGS. 12A, 13A, and 14A, respectively. is there.
  • FIG. 15 is a cross-sectional view of the housing, the first ring, the second ring, and the third ring. 12 to 15, the same components as those of the electromagnetic actuator 1a according to the second embodiment shown in FIGS. 9 to 11 are denoted by the same reference numerals, and the description thereof is omitted.
  • the electromagnetic actuator 1b shown in FIGS. 1 to 4 is configured in the same manner as the electromagnetic actuator 1a, and therefore illustration and description thereof are omitted.
  • the first ring 40, the second ring 41, and the third ring 42 are installed in a space in which the inner peripheral portion of the housing 13 is expanded.
  • the first ring 40 is formed with a first tapered surface 401 by chamfering an inner peripheral portion of an end portion in contact with the second ring 41.
  • the second ring 41 has second tapered surfaces 411 and 412 formed by chamfering inner peripheral portions at both ends.
  • the third ring 42 is formed with a third tapered surface 421 by chamfering the inner peripheral portion of the end portion that contacts the second ring 41.
  • the first groove 29 is constituted by the gap between the first tapered surface 401 and the second tapered surface 411.
  • the gap between the second taper surface 412 and the third taper surface 421 constitutes the second groove portion 27. That is, the first groove portion 29 and the second groove portion 27 have a shape in which the wall portion is inclined so as to expand from the bottom of the groove toward the opening.
  • a protrusion 413 is formed on the inner peripheral portion of the second ring 41 by two second tapered surfaces 411 and 412.
  • the holding force for holding the axial position of the shaft 14 is increased by the forces Fy1 and Fy2 similar to those of the second embodiment, and the shaft 14 due to the vibration of the electromagnetic actuator 1a is increased. Unnecessary linear motion can be suppressed. Further, the positional accuracy of the shaft 14 can be increased.
  • the first groove portion 29 and the second groove portion 27 may be formed by using one ring 26 as in the first and second embodiments, or may be implemented. It may be formed using a plurality of first rings 40, second rings 41, and third rings 42 as in the third embodiment.
  • the first groove portion 29 and the second groove portion 27 have a shape in which a wall portion is suspended from the bottom of the groove as in the first and second embodiments. Alternatively, the wall portion may be inclined so as to expand from the bottom of the groove toward the opening.
  • the elastic body 32 has a strong elastic force when the balls 30 and 31 are in the first groove 29 and the second groove 27, and the balls 30 and 31 are in the first groove. It is more preferable that the elastic force is weakened in a state where it is disengaged from 29 and the second groove 27.
  • the electromagnetic actuator 1a moves the shaft 14 from the OFF position while suppressing unnecessary linear movement of the shaft 14 due to vibration. Power consumption can be further reduced by reducing the force required to push out to the ON position, and the force required when the return mechanism of the cam switching mechanism 100 pushes the shaft 14 back from the OFF position to the ON position. By reducing the load, the load on the return mechanism side can be reduced.
  • the elastic body 32 may be constituted by, for example, an air spring.
  • the air pressure of the air spring is increased when the balls 30 and 31 are in the first groove portion 29 and the second groove portion 27, and the balls 30 and 31 are detached from the first groove portion 29 and the second groove portion 27.
  • a pressure control device that lowers the air pressure of the air spring is added to the electromagnetic actuator 1a.
  • the elastic body 32 may be constituted by a liquid spring, and a pressure control device that similarly controls the pressure of the liquid may be added.
  • the mechanism since the ball arranged in the opening of the side hole of the shaft enters the first groove portion and the second groove portion to maintain the axial position of the shaft, the mechanism has a return mechanism in particular. When used, power consumption can be reduced and the load on the electromagnetic actuator can be reduced. Therefore, it is suitable for use in a cam switching mechanism for an engine valve.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Device For Special Equipments (AREA)

Abstract

L'invention concerne un actionneur électromagnétique (1a) qui est pourvu : d'une pluralité de billes (30 et 31), qui sont disposées dans une ouverture d'un orifice horizontal (144) pénétrant dans un arbre (14) dans la direction du diamètre ; d'un corps élastique (32), qui est disposé entre les billes (30 et 31), et presse les billes (30 et 31) vers l'extérieur ; d'une première section de rainure (29), qui est formée du côté paroi interne d'une section creuse d'un boîtier (13), et dans laquelle entrent les billes (30 et 31) par réception de la pression du corps élastique (32) lorsque l'arbre (14) est au niveau d'une position d'arrêt (première position) ; et d'une seconde section de rainure (27), qui est formée du côté paroi interne de la section creuse du boîtier (13) à un intervalle dans la direction de l'axe de la première section de rainure (29), et dans laquelle entrent les billes (30 et 31) par réception de la pression du corps élastique (32) lorsque l'arbre (14) est au niveau d'une position de marche (seconde position).
PCT/JP2014/084099 2014-12-24 2014-12-24 Actionneur électromagnétique WO2016103355A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/JP2014/084099 WO2016103355A1 (fr) 2014-12-24 2014-12-24 Actionneur électromagnétique

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2014/084099 WO2016103355A1 (fr) 2014-12-24 2014-12-24 Actionneur électromagnétique

Publications (1)

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WO2016103355A1 true WO2016103355A1 (fr) 2016-06-30

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WO (1) WO2016103355A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020149456A1 (en) * 2000-06-21 2002-10-17 Erwin Krimmer Actuator, in particular for valves, relays or similar
JP2010019319A (ja) * 2008-07-09 2010-01-28 Keihin Corp 電磁スプール弁装置

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020149456A1 (en) * 2000-06-21 2002-10-17 Erwin Krimmer Actuator, in particular for valves, relays or similar
JP2010019319A (ja) * 2008-07-09 2010-01-28 Keihin Corp 電磁スプール弁装置

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