JP2017005123A - Electromagnetic actuator - Google Patents

Abstract

An electromagnetic actuator that can be operated with a small amount of current, is suitable for short-time switching, and can be miniaturized. An intake-side electromagnetic solenoid (electromagnetic actuator) 14 includes a pair of switching pins 41A and 41B that are movable in the vertical direction. The first switching pin 41A includes a first permanent magnet 43A that excites the S pole on the upper end surface, and the lower end portion is fitted into the first slide groove 13A in a protruding state that has moved downward. The second switching pin 41B includes a second permanent magnet 43B that excites the N pole on the upper end surface, and the lower end portion is fitted into the second slide groove 13B in a protruding state that has moved downward. The first iron core 47A provided in the first electromagnetic solenoid 42A is disposed above the first switching pin 41A, and the south pole is excited at the lower end by energizing the first coil 48A. The second iron core 47B provided in the second electromagnetic solenoid 42B is disposed above the second switching pin 41B, and the N pole is excited at the lower end by energizing the second coil 48B. [Selection] Figure 4

Description

  The present invention relates to an electromagnetic actuator, and more particularly to an electromagnetic actuator suitably used for a cam switching device that selectively switches a pair of cams having different cam profiles provided corresponding to an intake / exhaust valve of an engine.

  Conventionally, two types of cams with different cam profiles are provided on the camshaft, and the camshaft is made to change the valve characteristics of the intake and exhaust valves by selectively switching the cam by sliding the camshaft in the axial direction with a hydraulic actuator. There is a device. As an electromagnetic actuator used in this cam switching device, one that selectively drops two restriction pins using two permanent magnets having different polarities is known (see Patent Document 1).

  In this electromagnetic actuator, two restriction pins arranged side by side function as an iron core in an electromagnet, and both restriction pins are excited by a coil that collectively surrounds the upper portions of both restriction pins. A permanent magnet whose bottom surface is excited to the N pole is disposed above one of the regulation pins, and a permanent magnet whose bottom surface is excited to the S pole is disposed above the other regulation pin. When one current is applied, one restriction pin is repelled and dropped with one permanent magnet, and when a current in the reverse direction is applied to the coil, the other restriction pin is repelled and dropped with the other permanent magnet.

JP 2013-239538 A

  In the conventional electromagnetic actuator, a large-diameter coil that surrounds the two restriction pins is required, resulting in an increase in the amount of current and an increase in the size of the actuator. In addition, since the restriction pin to be dropped is selected by switching the direction of the current flowing through the coil, switching for a short time is difficult.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide an electromagnetic actuator that can operate with a small amount of current, is suitable for short-time switching, and can be downsized.

  In order to achieve the above-described object, the present invention includes a guide pin that is movable in the vertical direction, and a lower end portion of the guide pin is fitted into the guide groove, whereby the object on which the guide groove is formed An electromagnetic actuator that moves in accordance with the guide groove, having a first permanent magnet that excites one of the N-pole and S-pole on the upper end surface, and the lower end portion is fitted into the first guide groove in a protruding state that has moved downward A first guide pin, and a second guide pin having a second permanent magnet for exciting the other of the N and S poles on the upper end surface and having a lower end fitted in the second guide groove in a protruding state moved downward. A first iron core disposed above the first guide pin, wherein one of the N pole and the S pole is excited at the lower end by energizing the first coil, and the second guide pin is disposed above the second guide pin. A second iron core in which the other of the N and S poles is excited at the lower end by energizing the coil; And a control unit for selectively energizing the serial first coil to the second coil.

  According to the electromagnetic actuator of the present invention, it can be operated with a small amount of current, is suitable for short-time switching, and can be downsized.

It is a typical perspective view explaining the structure of the engine block upper part of the state which removed the head cover. It is typical sectional drawing explaining the structure of an intake / exhaust valve | bulb and its periphery. It is a typical perspective view explaining the external appearance of a double cam shaft. It is typical sectional drawing explaining the structure of an intake side electromagnetic solenoid. It is a figure explaining the selection operation of the 1st changeover pin typically, (A) shows the deenergization state of each electromagnetic solenoid, (B) shows the energization state to the 1st electromagnetic solenoid, (C) A state in which the first switching pin is raised due to the first slide groove becoming shallow is shown, and (D) shows a state in which the first switching pin is attracted to the first iron core. It is a figure explaining the selection operation of the 2nd change pin typically, (A) shows the non-energized state of each electromagnetic solenoid, (B) shows the energized state to the 2nd electromagnetic solenoid, (C) A state in which the second switching pin is raised as the second slide groove becomes shallow is shown, and (D) shows a state in which the second switching pin is attracted to the second iron core. (A) is a diagram for schematically explaining the periphery of the electromagnetic solenoid in the selected state of the standard intake cam, and (B) is a diagram for schematically explaining the positional relationship between the standard intake cam and the rocker roller. (A) is a figure which illustrates typically the circumference | surroundings of the electromagnetic solenoid in the selection state of a low speed cam, (B) is a figure which illustrates typically the positional relationship of a low speed cam and a rocker roller.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. An engine 100 shown in FIG. 1 is, for example, an in-line three cylinder, and includes a cam switching mechanism 1 that selectively switches a pair of cams (described later) according to the operating state of the engine 100. Each cylinder of the engine 100 is provided with a cylinder deactivation mechanism 2 for deactivating the cylinder by stopping the opening / closing operation of the intake and exhaust valves. The operations of the cam switching mechanism 1 and the cylinder deactivation mechanism 2 are controlled by an electronic control unit 3 (ECU).

  The cam switching mechanism 1 includes an intake side cam switching mechanism 10 and an exhaust side cam switching mechanism 20. The intake-side cam switching mechanism 10 includes an intake-side double cam shaft 12 provided with an intake cam 11, an intake-side slide groove 13 (see FIG. 3) for slidingly moving the intake-side double cam shaft 12, and an intake-side electromagnetic solenoid. 14. The exhaust side cam switching mechanism 20 includes an exhaust side double cam shaft 22 provided with an exhaust cam 21, an exhaust side slide groove 23 that slides the exhaust side double cam shaft 22, and an exhaust side electromagnetic solenoid 24. Yes. Among these, the intake side slide groove 13 and the exhaust side slide groove 23 are examples of guide grooves according to the present invention, and the intake side electromagnetic solenoid 14 and the exhaust side electromagnetic solenoid 24 are examples of electromagnetic actuators according to the present invention. It is.

  The intake cam 11 provided on the intake side double cam shaft 12 includes two types of cams (standard intake cam 15 and low speed cam 16) having different cam profiles, and an exhaust cam provided on the exhaust side double cam shaft 22. 21 includes two types of cams (an early opening cam 25 and a standard exhaust cam 26) having different cam profiles. The standard intake cam 15 and the quick opening cam 25 are examples of the first cam according to the present invention, and the low speed cam 16 and the standard exhaust cam 26 are examples of the second cam according to the present invention.

  The cylinder deactivation mechanism 2 is a mechanism for deactivating the cylinder by closing the intake and exhaust valves. As shown in FIG. 2, the cylinder deactivation mechanism 2 includes a rocker arm 51, a bracket 52, a hydraulic tappet 53, a needle 54, and a deactivation electromagnetic solenoid 55.

  The rocker arm 51 is swung by the intake cam 11 (standard intake cam 15, low speed cam 16) and exhaust cam 21 (standard exhaust cam 26, quick opening cam 25) to open the intake valve V1 and the exhaust valve V2 in the valve opening direction. It is a member to be operated. One end of the rocker arm 51 is attached to the bracket 52 so as to be rotatable about the rocker shaft 51B. The other end of the rocker arm 51 is in contact with the upper ends of the intake valve V1 and the exhaust valve V2 from above. A rocker roller 51 </ b> A that contacts the intake cam 11 or the exhaust cam 21 is provided midway in the longitudinal direction of the rocker arm 51.

  The bracket 52 is a member that is pin-connected to the rocker arm 51 by a rocker shaft shaft 51B, and is moved up and down in accordance with the rocking of the rocker arm 51 in a cylinder rest state. Inside the bracket 52, a needle storage space 52 </ b> A that stores the needle 54 and is filled with engine oil is formed. A lower portion of the bracket 52 is a bottomed cylindrical piston portion 52 </ b> B that is advanced and retracted with respect to the hydraulic tappet 53. An oil hole 52C, which serves as an engine oil passage and into which the tip of the needle 54 is inserted, is formed in the center of the bottom surface of the piston portion 52B in a state of penetrating in the plate thickness direction. In addition, a communication hole 52D is formed on the side surface of the piston portion 52B to communicate the oil passage OL filled with engine oil and the needle housing empty portion 52A.

  The hydraulic tappet 53 is a member that supports the bracket 52 (piston portion 52B) from below while the piston portion 52B of the bracket 52 is inserted so as to be able to advance and retreat, and a cylindrical body 53A and a check ball spring (not shown). The check ball 53B urged upward by the bottom, a bottomed cylindrical storage portion 53C for contacting the lower end surface of the piston portion 52B and storing the check ball 53B and the check ball spring, and a storage portion 53C Piston spring 53D etc. supported from the lower side are provided.

  In the operation state of the cylinder, in the hydraulic tappet 53, the check ball 53B is urged upward, and the oil hole 52C of the piston portion 52B is closed by the check ball 53B. In a state where the oil hole 52C is closed, the engine oil that fills the lower side of the piston portion 52B cannot flow. For this reason, the bracket 52 (piston part 52B) cannot move downward, and the position in the height direction is fixed.

  On the other hand, in the cylinder tap state, in the hydraulic tappet 53, the check ball 53B is moved downward by the needle 54, and the oil hole 52C of the piston portion 52B is opened. In the open state of the oil hole 52C, the engine oil that fills the lower side of the piston part 52B can flow into the needle housing empty part 52A through the oil hole 52C. Then, the engine oil in the needle housing empty portion 52A can flow into the oil passage OL from the communication hole 52D formed on the side surface of the piston portion 52B. For this reason, when the oil hole 52C is opened, the bracket 52 (piston portion 52B) can move downward. That is, if the pressing force by the cams 11 and 21 is higher than the restoring force of the piston spring 53D, the piston spring 53D contracts and the bracket 52 moves downward. When the pressing force by the cams 11 and 21 is lower than the restoring force of the piston spring 53D, the bracket 52 moves upward by the restoring force of the piston spring 53D.

  The needle 54 is a rod-like member for moving the check ball 53B downward. The needle 54 is stored in the needle storage space 52A of the bracket 52 in a state of being movable in the axial direction, and the lower end is brought into contact with the check ball 53B. ing. The upper end portion of the needle 54 is housed inside the inactive electromagnetic solenoid 55 and is moved in the vertical direction by a plunger 55C provided in the inactive electromagnetic solenoid 55.

  The resting electromagnetic solenoid 55 includes a guide shaft 55A, a resting coil 55B, and a plunger 55C.

  The guide shaft 55A is a cylindrical member whose upper end is closed, and a plunger storage space 55D for storing the plunger 55C in a state in which the plunger 55C can move in the axial direction of the needle 54 is provided inside the upper end, and the storage space 55D. A needle housing empty portion 55E is provided below the needle housing 52 so that the needle 54 can be moved in the axial direction. Further, a guide empty portion 55F is provided at the lower end portion of the guide shaft 55A. The guide empty portion 55F is fitted in a state in which the upper end portion of the bracket 52 is slidably movable in the axial direction of the needle 54.

  The resting coil 55B is disposed at the upper end of the guide shaft 55A, and generates a magnetic field by energization to bias the plunger 55C downward. The plunger 55C is in contact with the upper end of the needle 54 from above, and pushes the needle 54 downward by a magnetic field generated from the resting coil 55B. When the energization of the resting coil 55B is stopped, the generation of the magnetic field is stopped, so that the check ball 53B is moved upward by the restoring force of the check ball spring, and the needle 54 and the plunger 55C are also moved accordingly. Moved upwards.

  In the cylinder deactivation mechanism 2 configured as described above, the deactivation electromagnetic solenoid 55 (deactivation coil 55B) is de-energized in the cylinder operation state, and the deactivation electromagnetic solenoid 55 is de-energized in the cylinder deactivation state. Is done.

  When the electromagnetic solenoid 55 for rest is not energized, the check ball 53B is moved upward to close the oil hole 52C of the piston portion 52B. Thereby, the height position of the bracket 52 is fixed. When the rocker roller 51A is pressed along the cam profile of the intake cam 11 or the exhaust cam 21, one end of the rocker arm 51 rotates about the rocker shaft 51B and the other end of the valve spring SP. It swings against the restoring force and opens and closes the intake valve V1 and the exhaust valve V2.

  In the energized state of the electromagnetic solenoid 55 for rest, the check ball 53B is moved downward to open the oil hole 52C of the piston portion 52B. As a result, the bracket 52 becomes movable in the vertical direction (the axial direction of the needle 54). When the rocker roller 51A is pressed along the cam profile of the intake cam 11 or the exhaust cam 21, the restoring force of the valve spring SP is strong, so the other end of the rocker arm 51 is the upper end of the intake valve V1. And the upper end of the exhaust valve V2 is pivoted about a fulcrum, and one end of the exhaust valve V2 swings up and down with the bracket 52 via the rocker shaft 51B. For this reason, even if the rocker arm 51 swings, the exhaust valve V2 is maintained in the closed state.

  Next, the intake side cam switching mechanism 10 and the exhaust side cam switching mechanism 20 will be described. Here, for each part of the exhaust-side cam switching mechanism 20, the exhaust-side double cam shaft 22, the exhaust-side slide groove 23, and the exhaust-side electromagnetic solenoid 24, the exhaust cam 21 to be switched is the quick-open cam 25. And the standard exhaust cam 26 are configured in the same manner as each part of the intake side cam switching mechanism 10. Therefore, in the following, the intake side cam switching mechanism 10 will be described, and the description of the exhaust side cam switching mechanism 20 will be omitted.

  As shown in FIG. 3, the intake-side double camshaft 12 is spline-fitted to the inner camshaft 12A that rotates in conjunction with a crankshaft (not shown) of the engine 100 and the outer periphery of the inner camshaft 12A. And an outer cam shaft 12B that is slidable in the axial direction with respect to 12A.

  A plurality of intake cams 11 are press-fitted into the outer cam shaft 12B and attached so as to be rotatable integrally with the outer cam shaft 12B. As shown in FIG. 1, in the engine 100 of the present embodiment, since one cylinder includes two intake valves V1, a total of six intake valves V1 and six intake cams 11 are provided. As shown in FIG. 3, each intake cam 11 includes a standard intake cam 15 and a low-speed cam 16. By sliding the outer cam shaft 32 in the axial direction of the inner cam shaft 31, One of the low speed cams 16 is selected. The two intake cams 11 corresponding to the same cylinder are attached so that the cam profiles have the same phase. Since there are three cylinders, the three sets of intake cams 11 are attached in a state where the phases are shifted by 120 ° for each cylinder.

  Two strips of intake side slide grooves 13 (first slide groove 13A and second slide groove 13B) are provided at the end of the outer cam shaft 12B. When the outer cam shaft 12B is slid in the axial direction of the inner cam shaft 12A, the lower ends of the switching pins 41A and 41B included in the intake side electromagnetic solenoid 14 are fitted into these slide grooves 13A and 13B ( (Refer FIG. 5 (B) and FIG. 6 (B)).

  Next, the intake side electromagnetic solenoid 14 will be described. As described above, the intake-side electromagnetic solenoid 14 is an example of an electromagnetic actuator according to the present invention. As shown in FIG. 4, the intake-side electromagnetic solenoid 14 includes a case 31, a pin guide 32, a first switching pin 41A, a second switching pin 41B, a first electromagnetic solenoid 42A, and a second electromagnetic solenoid 42B. It has.

  The case 31 is a cylindrical member whose lower end is open and whose ceiling is closed, and the internal space is a storage space for storing the first electromagnetic solenoid 42A, the second electromagnetic solenoid 42B, etc., and a flange is formed at the lower end. Has been.

  The pin guide 32 has a first guide hole 32A guided by inserting the shaft portion 45A of the first switching pin 41A, and a second guide hole 32B guided by inserting the shaft portion 45B of the second switching pin 41B. It is a formed rectangular parallelepiped block-shaped member. In this embodiment, the pin guide 32 is made of stainless steel. This is to prevent the pin guide 32 from becoming magnetized and to smoothly guide the shaft portions 45A and 45B of the first switching pin 41A and the second switching pin 41B. Moreover, the height of the pin guide 32 is set lower than the length of each shaft part 45A, 45B, and when each of the first switching pin 41A and the second switching pin 41B moves to the lower end of the moving range, A part of the portions 45 </ b> A and 45 </ b> B is configured to protrude downward from the lower surface of the pin guide 32.

  A lower yoke 33 is provided between the case 31 and the pin guide 32. The lower yoke 33 is an example of a locking member according to the present invention, and is made of a soft magnetic material. In the present embodiment, the lower yoke 33 is made of soft iron. The lower yoke 33 is formed with a first insertion opening 33A and a second insertion opening 33B penetrating in the thickness direction. These insertion openings 33A and 33B are slightly larger than the diameters of the shaft portion 45A of the first switching pin 41A and the shaft portion 45B of the second switching pin 41B, and the head portion 44A and the second switching pin of the first switching pin 41A. It is formed in a circular shape that is sufficiently smaller than the diameter of the head 44B of 41B.

  By inserting the shaft portions 45A and 45B of the first switching pin 41A and the second switching pin 41B into the first insertion opening 33A and the second insertion opening 33B, the first switching pin 41A is positioned at the lower end of the moving range. At this time, the head portion 44A of the first switching pin 41A cannot contact the first insertion opening 33A, and thus contacts the lower yoke 33. Similarly, when the second switching pin 41B is positioned at the lower end of the movement range, the head portion 44B of the second switching pin 41B cannot contact the second insertion opening 33B, and thus contacts the lower yoke 33. Since each of the heads 44A and 44B is provided with permanent magnets 43A and 43B, the heads 44A and 44B are attracted to the lower yoke 33 by the magnetic force from the permanent magnets 43A and 43B. Suppression is suppressed.

  An upper yoke 34 is disposed in the upper part of the storage space formed by the case 31. The upper yoke 34 is a member that connects the first iron core 47A provided in the first electromagnetic solenoid 42A and the second iron core 47B provided in the second electromagnetic solenoid 42B at the upper end portions of the respective iron cores 47A and 47B. It is made by. In the present embodiment, the upper yoke 34 is made of plate-shaped soft iron. By interposing the upper yoke 34, the first iron core 47A and the second iron core 47B become a series of soft magnetic bodies.

  The first switching pin 41A is an example of a first guide pin according to the present invention, and includes a first head 44A having a first permanent magnet 43A that excites an S pole on the upper surface, and a lower surface of the first head 44A. The first shaft portion 45A provided below is provided.

  The first head 44A is attracted to the first iron core 47A when the first electromagnetic solenoid 42A is not energized, and is separated from the first iron core 47A when the first electromagnetic solenoid 42A is energized. The first head portion 44A has a thick disk shape and moves in the vertical direction along the inner peripheral surface of the cylindrical first pin guide 35A. In the present embodiment, the first pin guide 35A is made of stainless steel.

  A first lid member 46A is attached to the first head 44A above the first permanent magnet 43A. The first lid member 46A is made of a soft magnetic material (in this embodiment, plate-shaped soft iron), and the distance between the first permanent magnet 43A and the first iron core 47A (both of them is determined by the thickness of the first lid member 46A). The strength of the magnetic force acting between them is adjusted.

  The first shaft portion 45A is housed in the pin guide 32 (first guide hole 32A) while the first head portion 44A is attracted to the first iron core 47A. Further, when the first switching pin 41A moves to the lower end of the moving range, the lower end portion is fitted into the first slide groove 13A (an example of the first guide groove). In this fitted state, the outer cam shaft 12B is slid relative to the inner cam shaft 12A along the first slide groove 13A.

  The second switching pin 41B is an example of a second guide pin according to the present invention, and includes a second head 44B having a second permanent magnet 43B that excites an N pole on the upper surface, and a lower surface of the second head 44B. The second shaft portion 45B is provided below.

  The second head 44B is attracted to the second iron core 47B when the second electromagnetic solenoid 42B is not energized, and is separated from the second iron core 47B when the second electromagnetic solenoid 42B is energized. The second head 44B has a thick disk shape and moves in the vertical direction along the inner peripheral surface of the cylindrical second pin guide 35B. In the present embodiment, the second pin guide 35B is made of stainless steel.

  A second lid member 46B is attached to the second head 44B above the second permanent magnet 43B. The second lid member 46B is made of a soft magnetic material (plate-like soft iron in the present embodiment), and the distance between the second permanent magnet 43B and the second iron core 47B (both of them depends on the thickness of the second lid member 46B). The strength of the magnetic force acting between them is adjusted.

  The second shaft portion 45B is housed in the pin guide 32 (second guide hole 32B) with the second head portion 44B being adsorbed by the second iron core 47B. Further, when the second switching pin 41B moves to the lower end of the movement range, the lower end portion is fitted into the second slide groove 13B (an example of the second guide groove). In this fitted state, the outer cam shaft 12B is slid along the second slide groove 13B with respect to the inner cam shaft 12A.

  The first electromagnetic solenoid 42A includes a first iron core 47A and a first coil 48A. The first iron core 47A is disposed above the first switching pin 41A, and the first coil 48A is wound around the first iron core 47A. Since the first iron core 47A is made of a soft magnetic material, it is demagnetized when the first coil 48A is not energized. When the first permanent magnet 43A is attracted, the N pole is excited at the lower end. When the first coil 48A is energized, the south pole is excited at the lower end by the magnetic field generated by the first coil 48A.

  The second electromagnetic solenoid 42B includes a second iron core 47B and a second coil 48B. The second iron core 47B is disposed above the second switching pin 41B, and the second coil 48B is wound around the second iron core 47B. Since the second iron core 47B is made of a soft magnetic material, it is demagnetized when the second coil 48B is not energized. When the second permanent magnet 43B is attracted, the south pole is excited at the lower end. Further, when the second coil 48B is energized, the N pole is excited at the lower end by the magnetic field generated by the second coil 48B.

  Next, the operation of the intake-side electromagnetic solenoid 14, that is, the operation of selectively projecting the first switching pin 41A and the second switching pin 41B will be described. This operation is controlled by the ECU 3, which is an example of a control unit.

  First, the protruding operation of the first switching pin 41A will be described. As shown in FIG. 5A, when the first coil 48A and the second coil 48B are not energized, the first permanent magnet 43A included in the first switching pin 41A is attracted to the lower end of the first iron core 47A. Therefore, the N pole is excited at the lower end of the first iron core 47A. Similarly, since the second permanent magnet 43B included in the second switching pin 41B is attracted to the lower end of the second iron core 47B, the south pole is excited at the lower end of the second iron core 47B. In addition, since the upper end of the first iron core 47A and the upper end of the second iron core 47A are connected by the upper yoke 34 made of a soft magnetic material, the first iron core 47A, the second iron core 47A, and the upper yoke are connected. 34 is in a state of constituting one magnet as a whole.

  As shown in FIG. 5B, when the ECU 3 energizes the first coil 48A, the south pole is excited at the lower end of the first iron core 47A by the magnetic field generated by the first coil 48A. As a result, repulsion occurs between the first permanent magnet 43A, the first switching pin 41A falls, and the lower end portion of the first switching pin 41A (first shaft portion 45A) is fitted into the first slide groove 13A. The In this energized state, the S pole is also excited at the lower end of the second iron core 47B by the magnetic field generated by the first coil 48A. For this reason, the adsorption | suction state of the 2nd iron core 47B and the 2nd switching pin 41B is maintained.

  As shown in FIG. 5C, when energization to the first coil 48A is stopped, the N pole is excited at the lower end of the first iron core 47A by the magnetic force of the second permanent magnet 43B. Moreover, the first switching pin 41A is raised by making the first slide groove 13A shallow. When the first slide groove 13A becomes shallower and the upper surface of the first switching pin 41A approaches the vicinity of the lower end of the first iron core 47A, the first switching pin 41A is moved to the first iron core 47A as shown in FIG. To be adsorbed.

  Next, the protruding operation of the second switching pin 41B will be described. As shown in FIG. 6A, when the first coil 48A and the second coil 48B are in a non-energized state, the first iron core 47A, the second iron core 47A, and the upper yoke 34 are connected as described with reference to FIG. As a whole, one magnet is configured, and the first switching pin 41A is attracted to the lower end of the first iron core 47A, and the second switching pin 41B is attracted to the lower end of the second iron core 47B.

  As shown in FIG. 6B, when the ECU 3 energizes the second coil 48B, the N pole is excited at the lower end of the second iron core 47B by the magnetic field generated by the second coil 48B. As a result, repulsion occurs between the second permanent magnet 43B, the second switching pin 41B falls, and the lower end of the second switching pin 41B (second shaft portion 45B) is fitted into the second slide groove 13B. The In this energized state, the N pole is also excited at the lower end of the first iron core 47A by the magnetic field generated by the second coil 48B. For this reason, the adsorption state of the first iron core 47A and the first switching pin 41A is maintained.

  As shown in FIG. 6C, when energization to the second coil 48B is stopped, the south pole is excited at the lower end of the second iron core 47B by the magnetic force of the first permanent magnet 43A. Moreover, the 2nd switching pin 41B is raised because the 2nd slide groove | channel 13B becomes shallow. When the second slide groove 13B becomes shallower and the upper surface of the second switching pin 41B approaches the vicinity of the lower end of the second iron core 47B, the second switching pin 41B is moved to the second iron core 47B as shown in FIG. To be adsorbed.

  Next, cam switching control by the ECU 3 will be described. Here, the switching control between the standard intake cam 15 and the low-speed cam 16 included in the intake cam 11 and the switching control between the standard exhaust cam 26 and the quick-open cam 25 included in the exhaust cam 21 have the same contents. Therefore, the switching control at the intake cam 11 will be described, and the description of the switching control at the exhaust cam 21 will be omitted.

  As shown in FIG. 7A, when the standard intake cam 15 is selected, the first switching pin 41A located on the left side in the drawing moves downward, and the lower end of the first switching pin 41A is the first slide groove 13A. To fit. Since the intake-side double cam shaft 12 is rotating, as shown in FIG. 7B, the outer cam shaft 12B slides to the right in the drawing with respect to the inner cam shaft 12A, and the intake cam 11 The standard intake cam 15 included in the abutment comes into contact with the rocker roller 51A. As a result, the rocker arm 51 is swung along the cam profile of the standard intake cam 15, and the intake valve V1 is opened and closed.

  As shown in FIG. 8A, when the low-speed cam 16 is selected, the second switching pin 41B located on the right side in the drawing moves downward, and the lower end portion of the second switching pin 41B becomes the second slide groove 13B. Mating. Since the intake-side double cam shaft 12 is rotating, as shown in FIG. 8B, the outer cam shaft 12B slides to the left in the drawing with respect to the inner cam shaft 12A, and the intake cam 11 The low-speed cam 16 included in the abuts against the rocker roller 51A. Thereby, the rocker arm 51 is swung along the cam profile of the low-speed cam 16, and the intake valve V1 is opened and closed.

  As described above, the intake-side electromagnetic solenoid 14 according to the present embodiment includes the pair of switching pins 41A and 41B that can move in the vertical direction, and the lower ends of the switching pins 41A and 41B are arranged at the slide grooves 13A and 13B. The outer cam shaft 12B in which the slide grooves 13A and 13B are formed is moved according to the slide grooves 13A and 13B. The first switching pin 41A includes a first permanent magnet 43A that excites the S pole on the upper end surface, and the lower end portion is fitted into the first slide groove 13A in a protruding state that has moved downward. The second switching pin 41B includes a second permanent magnet 43B that excites the N pole on the upper end surface, and the lower end portion is fitted into the second slide groove 13B in a protruding state that has moved downward. The first iron core 47A provided in the first electromagnetic solenoid 42A is disposed above the first switching pin 41A, and the S pole is excited at the lower end by energizing the first coil 48A. The second iron core 47B provided in the second electromagnetic solenoid 42B is disposed above the second switching pin 41B, and the N pole is excited at the lower end by energizing the second coil 48B.

  The ECU 3 selectively energizes the first coil 48A and the second coil 48B. When the first coil 48A is energized, the lower end of the first iron core 47A and the first permanent magnet 43A are repelled, and the first switching pin 41A can be selectively fitted into the first slide groove 13A. Similarly, when the second coil 48B is energized, the lower end of the second iron core 47B and the second permanent magnet 43B are repelled, and the second switching pin 41B can be selectively fitted into the second slide groove 13B. .

  As described above, the intake-side electromagnetic solenoid 14 according to the present embodiment can be operated with a small amount of current because it is only necessary to pass a current through one of the coils 48A and 48B during the period in which the switching pins 41A and 41B are dropped. In addition, the control period is short. Furthermore, the electromagnetic solenoids 42A and 42B may be disposed above the switching pins 41A and 41B, which is suitable for downsizing.

  The above description of the embodiment is for facilitating the understanding of the present invention, and does not limit the present invention. The present invention can be changed and improved without departing from the gist thereof, and the present invention includes equivalents thereof.

  For example, in the above-described embodiment, the object to be moved is the outer cam shaft included in the double cam shaft, but other types of objects may be used. Further, the shape of the switching pins 41A and 41B is not limited to the shape of the above-described embodiment. For example, permanent magnets 43A and 43B may be joined to the upper ends of the shaft portions 45A and 45B.

DESCRIPTION OF SYMBOLS 1 ... Cam switching mechanism, 2 ... Cylinder deactivation mechanism, 3 ... EUC, 10 ... Intake side cam switching mechanism, 11 ... Intake cam, 12 ... Intake side double cam shaft, 12A ... Inner cam shaft, 12B ... Outer cam shaft, DESCRIPTION OF SYMBOLS 13 ... Intake side slide groove, 13A ... 1st slide groove, 13B ... 2nd slide groove, 14 ... Intake side electromagnetic solenoid, 15 ... Standard intake cam, 16 ... Low speed cam, 20 ... Exhaust side cam switching mechanism, 21 ... Exhaust Cam: 22 ... Exhaust side double cam shaft, 23 ... Exhaust side slide groove, 24 ... Exhaust side electromagnetic solenoid, 25 ... Quick opening cam, 26 ... Standard exhaust cam, 31 ... Case, 32 ... Pin guide, 32A ... First Guide hole, 32B ... second guide hole, 33 ... lower yoke, 33A ... first insertion opening, 33B ... second insertion opening, 34 ... upper yoke, 35A ... first pin guide, 35B ... second pin guide, 41A ... 1st switching pin , 41B ... second switching pin, 42A ... first electromagnetic solenoid, 42B ... second electromagnetic solenoid, 43A ... first permanent magnet, 43B ... second permanent magnet, 44A ... first head, 44B ... second head, 45A ... first shaft portion, 45B ... second shaft portion, 46A ... first lid member, 46B ... second lid member, 47A ... first iron core, 47B ... second iron core, 48A ... first coil, 48B ... second Coil, 51 ... Rocker arm, 51A ... Rocker roller, 51B ... Rocker shaft shaft, 52 ... Bracket, 52A ... Needle storage cavity, 52B ... Piston part, 52C ... Oil hole, 52D ... Communication hole, 53 ... Hydraulic tappet, 53A ... Body, 53B ... Check ball, 53C ... Storage part, 53D ... Piston spring, 54 ... Needle, 55 ... Electromagnetic solenoid for pause, 55A ... Guide shaft, 55B ... Coil for pause , 55C ... plunger, 55D ... plunger housing space, 55E ... needle chamber empty unit, 55F ... guide hollow portion, 100 ... engine, OL ... oil passage, V1 ... intake valve, V2 ... exhaust valve, SP ... valve spring

Claims (5)

An electromagnetic actuator comprising a guide pin movable in the vertical direction, and moving an object on which the guide groove is formed according to the guide groove by fitting a lower end portion of the guide pin into the guide groove. ,
A first guide pin provided with a first permanent magnet for exciting one of the N pole and the S pole on the upper end surface, the lower end portion being fitted into the first guide groove in a protruding state moved downward;
A second guide pin provided with a second permanent magnet for exciting the other of the N pole and the S pole on the upper end surface, the lower end portion being fitted in the second guide groove in a protruding state moved downward;
A first iron core disposed above the first guide pin, wherein one of the north and south poles is excited at the lower end by energizing the first coil;
A second iron core that is disposed above the second guide pin and in which the other of the N and S poles is excited at the lower end by energizing the second coil;
An electromagnetic actuator comprising: a controller that selectively energizes the first coil and the second coil. The electromagnetic actuator according to claim 1, wherein an upper end portion of the first iron core and an upper end portion of the second iron core are connected by a soft magnetic member. The first guide pin includes a first head portion provided with the first permanent magnet, and a first shaft portion provided downward from the lower surface of the first head portion,
The said 2nd guide pin is provided with the 2nd head part in which the said 2nd permanent magnet was provided, and the 2nd axial part provided below from the lower surface of the said 2nd head part. Electromagnetic actuator. A first insertion opening having a shape in which the first shaft portion is inserted and the first head portion is not inserted; and a second insertion opening having a shape in which the second shaft portion is inserted and the second head portion is not inserted. The electromagnetic actuator according to claim 3, further comprising a locking member formed and made of a soft magnetic material. The object in which the guide groove is formed is splined to the outer periphery of the inner camshaft that rotates in conjunction with the crankshaft of the engine, and the first cam and the second cam having different cam profiles are provided so as to be integrally rotatable. The electromagnetic actuator according to any one of claims 1 to 4, wherein the electromagnetic actuator is an outer camshaft.

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