JP5744537B2 - Electromagnetic solenoid and variable valve operating device using the same - Google Patents

Description

  The present invention relates to an electromagnetic solenoid in which a plunger moves by excitation of an excitation coil and a variable valve operating apparatus using the electromagnetic solenoid.

In general, an electromagnetic solenoid projects a plunger by excitation of an exciting coil, and when the exciting coil is demagnetized, the plunger is pushed to its original position by a biasing means such as a spring.
In order for the plunger to be pushed in and stopped at the original position, a stopper is provided at a predetermined position, and the pushed plunger collides with the stopper and stops at the original position.
The stopper is generally made of metal as well as the plunger. Therefore, a metal sound is generated when the plunger collides with the stopper.

  Therefore, a technique has been proposed in which a shock-absorbing member made of elastomer is provided at a portion where the plunger or the stopper collides, and a shock-absorbing member is interposed in the collision between the plunger and the stopper, thereby absorbing the shock caused by the collision and reducing the collision sound ( For example, see Patent Document 1).

Japanese translation of PCT publication No. 2004-510327

  The electromagnetic solenoid disclosed in Patent Document 1 is provided with an elastomer cushioning member at both of the opposing collision parts of the plunger and the core (stopper), and the shocking member absorbs the impact caused by the collision and reduces the collision noise. doing.

In the electromagnetic solenoid according to Patent Document 1, the buffer member absorbs the impact by receiving the plunger that is pushed in while being elastically deformed.
After the buffer member is elastically deformed, it is restored elastically, thereby returning the plunger to the original predetermined position.

However, if the plunger repeatedly collides with the buffer member over many years, the plunger can be stopped at a predetermined position accurately if it is deformed even if it slightly deforms due to qualitative secular change. Disappear.
If the plunger cannot stop at a predetermined position, the stroke amount of the plunger changes and the actuated member cannot be accurately operated.

The present invention has been made in view of such points, and a first object thereof is to provide an electromagnetic solenoid capable of reducing collision noise and always stopping the plunger at a predetermined position with high accuracy. .
Further, the second object is to provide a variable valve device that can change the valve timing with high accuracy by using a solenoid that always stops the plunger at a predetermined position with high accuracy.

  In order to achieve the above object, the invention according to claim 1 is characterized in that a plunger (75) is supported on a central axis of an excitation coil (73) wound in a cylindrical shape so as to be movable in the axial direction. Electromagnetic solenoid in which the plunger (75) protrudes forward in the forward direction against the external load by excitation of (73), and the plunger (75) moves backward by the external load by demagnetization of the excitation coil (73) In (70), a stopper member (82) for receiving the plunger (75) facing the rear is supported by a fixing member (80) so as to be slidable in the axial direction, and the stopper member (82) is a biasing means. (87) is urged forward by the position restricting portion (80b) constituted by the fixing member (80), and is slid forward by a predetermined position by the position restricting portion (80b). The plunger (75) contacts the stopper member (82) regulated by the position when retracted. It is an electromagnetic solenoid characterized by doing.

  According to a second aspect of the present invention, in the electromagnetic solenoid according to the first aspect, the fixing member (80) also serves as a yoke, houses the stopper member (82), and guides the cylinder in a slidable manner in the front-rear direction. (80a), the cylindrical guide portion (80a) has the position restricting portion (80b) having an opening (81) that reduces the inner diameter at the front end that is the plunger (75) side, The stopper member facing the opening (81) of the position restricting portion (80b) in a state where the stopper member (82) is urged by the urging means (87) and is in contact with the position restricting portion (80b). The plunger (75) contacts the front end surface of (82) when retracting.

  According to a third aspect of the present invention, in the electromagnetic solenoid according to the first or second aspect, the plunger (75) is supported so as to be movable in the axial direction by a plunger guide member (74) that also serves as a yoke, and is generally bottomed. A cylindrical movable yoke member (76) is passed through the bottom wall (76b) in a portion of the plunger (75) protruding rearward from the plunger guide member (74) behind the plunger guide member (74). The cylindrical wall (76a) of the movable yoke member (76) covers the end of the fixed member (80) along the inner circumference of the excitation coil (73). And

  According to a fourth aspect of the present invention, in the electromagnetic solenoid according to the second or third aspect, a lid member (85) is attached to a rear opening of the cylindrical guide portion (80a) of the fixing member (80), The biasing means (87) is interposed between the stopper member (82) and the lid member (85).

  According to a fifth aspect of the present invention, in the electromagnetic solenoid according to the fourth aspect, a female screw (80s) is formed on an inner periphery of the cylindrical guide portion (80a) of the fixing member (80), and the lid member (85) A male screw part (85s) is formed, and the male screw part (85s) is screwed into the female screw (80s) of the cylindrical guide part (80a), and the lid member (85 ), And the urging means (87) is interposed between the stopper member (82) and the male thread portion (85s) of the lid member (85).

  According to a sixth aspect of the present invention, in the electromagnetic solenoid according to the fifth aspect, the stopper member (82) has a cylindrical guide rod (82c) formed to protrude rearward from the cylindrical main body (82a), and the lid The member (85) is formed with a guide hole (85c) for slidably fitting the cylindrical guide rod (82c) into the male screw portion (85s) to guide the stopper member (82), and the biasing means Is a coil spring (87) and is provided around the cylindrical guide rod (82c).

  According to a seventh aspect of the present invention, in the electromagnetic solenoid according to the second aspect, the cylindrical guide portion (80a) has a bottom wall (80d) that opens forward and closes the rear opening on the plunger (75) side, The position restricting portion (80b) is an annular member that is fitted into the front opening of the cylindrical guide portion (80a).

  According to an eighth aspect of the present invention, in the electromagnetic solenoid according to the seventh aspect, the position restricting portion (80b) is fitted to an inner peripheral surface of a front opening of the cylindrical guide portion (80a) and fixed by caulking. It is characterized by that.

  According to a ninth aspect of the present invention, the movement of the plunger (75) by driving the electromagnetic solenoid (70) according to any one of the first to eighth aspects is performed via a power transmission mechanism (65, 53, 54). The valve timing is changed by transmitting to the operation of the variable cam member (50), and the external load (56) acting on the plunger (75) is incorporated into the power transmission mechanism (65, 53, 54). This is a variable valve operating device.

  According to a tenth aspect of the present invention, in the variable valve operating apparatus according to the ninth aspect, the power transmission mechanism (65, 53, 54) is pivotally supported by a fulcrum (P), and the movement of the plunger (75) is emphasized ( Q) is provided with a swing arm (65) having a large lever ratio (r) that swings when input at Q) and slides the slide member (53) at the operating point (R), together with the slide member (53). The variable cam member (50) moves to change the valve timing.

  According to the electromagnetic solenoid of the first aspect, the stopper member (82) urged forward by the urging means (87) and restricted to slide forward by the position restricting portion (80b) at a predetermined position, Since the plunger (75) contacts when retreating, when the electromagnetic solenoid (70) demagnetizes and the plunger (75) retreats and collides with the stopper member (82), the stopper member resists the biasing means (87). (82) retreats together with the plunger (75) so that the impact is absorbed and the collision noise is reduced, and the stopper member (82) once retracted moves forward with the plunger (75) by the biasing means (87). Since it is regulated by the regulating part (80b), the plunger (75) can return to a predetermined position and be positioned with high accuracy, and can be stopped. Therefore, the stroke amount of the plunger (75) can always be kept constant.

  According to the electromagnetic solenoid according to claim 2, the fixing member (80) has a cylindrical guide portion (80a) that also serves as a yoke, houses the stopper member (82), and guides it slidably in the front-rear direction. The cylindrical guide portion (80a) is formed with the position restricting portion (80b) having an opening (81) whose inner diameter is reduced at the front end, and the stopper member (82) is urged by the urging means (87). Since the plunger (75) comes into contact with the front end surface of the stopper member (82) facing the opening (81) of the position restricting portion (80b) while being in contact with the position restricting portion (80b), it is positioned. The fixed member (80) includes a cylindrical guide part (80a) for slidably storing the stopper member (82) and a position restricting part (80b) for restricting the sliding of the stopper member (82) to the front. The position restricting portion (80b) has a simple and compact structure in which the opening (81) is formed, and the electromagnetic solenoid (70) can be reduced in size and weight.

  According to the electromagnetic solenoid of claim 3, a movable yoke member (76) having a substantially bottomed cylindrical shape behind a plunger guide member (74) that also serves as a yoke that supports the plunger (75) so as to be movable in the axial direction. Is inserted into and supported by the bottom wall (76b) in a portion protruding rearward from the plunger guide member (74) of the plunger (75), and the cylindrical wall (76a) of the movable yoke member is connected to the exciting coil (73). ) Covers the end of the fixed member (80) that also serves as a yoke along the inner circumference of the cylinder, so that a magnetic circuit that efficiently passes magnetism generated by excitation of the excitation coil (73) is formed, and the movable yoke member (76) And the plunger (75) can be moved together with an appropriate movable force.

  According to the electromagnetic solenoid of the fourth aspect, the lid member (85) is attached to the rear opening of the cylindrical guide portion (80a) of the fixing member (80), and the stopper member (82) and the lid member (85) Since the biasing means (87) is interposed therebetween, the stopper member (82) and the biasing means (87) are sequentially inserted into the cylindrical guide portion (80a) from the rear opening, and the lid member (85) is attached. Therefore, it can be easily assembled and the assemblability is good.

  According to the electromagnetic solenoid of claim 5, the lid member (85) has a male threaded portion (85s), and is screwed into the female threaded portion (80s) of the cylindrical guide portion (80a) so that the lid member (85) is cylindrical. Since it is fixed to the rear opening of the guide portion (80a) and the urging means (87) is interposed between the stopper member (82) and the external thread portion (85s) of the lid member (85), the lid member Installation is easy and assembly is improved.

According to the electromagnetic solenoid of the sixth aspect, the stopper member (82) has a cylindrical guide rod (82c) protruding rearward from the cylindrical body (82a), and the lid member (85) is a male threaded portion (85s). Since the guide hole (85c) for guiding the stopper member (82) is formed by slidably inserting the cylindrical guide rod (82c) into the stopper member (82), the stopper member (82) is further moved in the cylindrical guide portion (80a). It can slide smoothly.
Further, since the biasing means is a coil spring (87) and is provided around the cylindrical guide rod (82c), the coil spring (87) is stably supported, and the stopper member (82) is effectively supported. Can be energized.

  According to the electromagnetic solenoid of claim 7, the cylindrical guide portion (80a) is formed with a bottom wall (80d) that opens in front of the plunger (75) and closes the rear opening, and the position restricting portion (80b) is formed. Since the annular member is fitted into the front opening of the cylindrical guide portion (80a), the fixing member (80) formed from the cylindrical guide portion (80a) and the bottom wall (80d) can be easily processed and molded. To improve the assembly of electromagnetic solenoid.

  According to the electromagnetic solenoid of claim 8, since the position restricting portion (80b) is fitted to the inner peripheral surface of the front opening of the cylindrical guide portion (80a) and fixed by caulking, the assembling property is increased. improves.

  According to the variable valve operating apparatus of the ninth aspect, the movement of the plunger (75) by the drive of the electromagnetic solenoid (70) is activated by the operation of the variable cam member (50) via the power transmission mechanism (65, 53, 54). Since the valve timing is changed by transmitting to the external load and the external load acting on the plunger (75) is incorporated in the power transmission mechanism (65, 53, 54), the plunger (75) always returns to a predetermined position and stops with high accuracy. By using the electromagnetic solenoid (70), the variation in the stroke amount of the plunger (75) can be reduced and the variable cam member (50) can be operated accurately, and the valve timing can be changed with high accuracy. .

  According to the variable valve operating apparatus of the tenth aspect, the power transmission mechanism (65, 53, 54) is pivotally supported by the fulcrum (P), and the movement of the plunger (75) is input by the force point (Q) and swings. The swinging arm (65) having a large lever ratio (r) for sliding the sliding member (53) at the operating point (R) is provided, and the variable cam member (50) moves together with the sliding member (53). Since the valve timing is changed, the moving speed of the sliding member (53) and the variable cam member (50) that slides by the swing arm (65) with a large lever ratio (r) is fast, and therefore the reaction is quick. This change can be executed with higher accuracy.

By increasing the lever ratio (r) of the swing arm (65), the stroke amount of the plunger (75) in the electromagnetic solenoid (70) can be reduced, and the electromagnetic solenoid (70) can be downsized.
Here, the lever ratio (r) is the ratio of the distance (PR) from the fulcrum (P) to the action point (R) to the distance (PQ) from the fulcrum (P) to the force point (Q).

It is sectional drawing of the demagnetization state of the electromagnetic solenoid which concerns on one Embodiment of this invention. It is sectional drawing of the excitation state of the electromagnetic solenoid. It is sectional drawing of the state immediately after demagnetizing the electromagnetic solenoid. 1 is an overall side view of a motorcycle equipped with an internal combustion engine using the electromagnetic solenoid as a variable valve operating device. FIG. 2 is a left side view in which the internal combustion engine is partially omitted, with a partial cross section. It is a right sectional view of the cylinder head of the internal combustion engine and its vicinity. FIG. It is the VIII-VIII sectional view taken on the line of FIG. It is sectional drawing of the demagnetization state of the electromagnetic solenoid which concerns on another embodiment.

Hereinafter, an electromagnetic solenoid 70 according to an embodiment of the present invention will be described with reference to FIGS.
The electromagnetic solenoid 70 includes a cylindrical casing 71 having a cylindrical shape, and the center axis of the cylindrical casing 71 is oriented in the front-rear direction. In FIGS. 1 to 3, the left side is the front and the right side is the rear.

  A cylindrical plunger guide member inserted in the front side portion of the cylindrical casing 71 is fitted with an excitation coil 73 wound around the outer periphery of a cylindrical bobbin 72 along the inner peripheral surface of the cylindrical casing 71. A plunger 75 is pierced and supported in the interior of 74 through sliding members 77 and 77 so as to be slidable back and forth.

The plunger guide member 74 is configured such that the half cotters 78 and 78 are fitted into the front opening of the cylindrical casing 71 in a state where the pair of half cotters 78 and 78 are fitted from the outside to the center in the front-rear direction of the outer peripheral surface. The center axis of the cylindrical casing 71 is aligned with the cylindrical casing 71 through the half cotters 78 and 78, and is inserted into the front half of the cylindrical casing 71 to be supported.
The plunger 75 penetrating the plunger guide member 74 is slidable back and forth on the central axis of the exciting coil 73 wound in a cylindrical shape.

A fixing member 80 that slidably accommodates the stopper member 82 is fitted into the latter half of the cylindrical casing 71.
The fixed member 80 includes a cylindrical guide portion 80a that houses the stopper member 82 and guides the slidable member in the front-rear direction.

In the fixing member 80, a position restricting portion 80b having an opening 81 having a reduced inner diameter is formed at the front end on the plunger guide member 74 side of the cylindrical guide portion 80a, and the rear end is radially outward. A disk-like flange portion 80c is formed extending.
Further, a female screw portion 80s is engraved on the inner peripheral surface of the cylindrical guide portion 80a on the rear half thereof.
The fixing member 80 is supported by the cylindrical casing 71 with the flange portion 80c fitted into the rear opening of the cylindrical casing 71 and the cylindrical guide portion 80a facing forward and inward.

The cylindrical bobbin 72 around which the exciting coil 73 is wound is supported by the plunger guide member 74 fitted on the front side, and the cylindrical guide part 80a of the fixing member 80 is fitted on the rear end part whose inner diameter is reduced. The half cotters 78, 78 and the flange portion 80c of the fixing member 80 sandwich the bobbin 72 from the front and back, and are wound on the central axis of the exciting coil 73 wound around the bobbin 72 to form a cylindrical shape. The plunger 75 and the stopper member 82 are positioned opposite to each other in the front-rear direction.
Accordingly, the excitation coil 73 wound around the bobbin 72 is surrounded by the half casings 78 and 78, the plunger guide member 74, and the fixing member 80 together with the cylindrical casing 71, and each also serves as a yoke.

  Inside the bobbin 72, there is a cavity 90 having an appropriate width between the front plunger guide member 74 and the cylindrical guide part 80a of the rear fixing member 80, and the outer circumference of the cylindrical guide part 80a having an outer diameter smaller than the inner diameter of the bobbin 72. There is a gap 91 between the surface and the inner peripheral surface of the bobbin 72.

A movable yoke member 76, which has a cylindrical shape with a cylindrical wall 76a and a bottom wall 76b, is formed at a portion protruding into the cavity 90 of the plunger 75 that slidably penetrates the plunger guide member 74, and a bottom wall 76b facing forward. Is inserted and supported integrally.
A cylindrical wall 76a extending rearward from the bottom wall 76b of the movable yoke member 76 is inserted into the gap 91 between the outer peripheral surface of the cylindrical guide portion 80a and the inner peripheral surface of the bobbin 72.

In this manner, the movable yoke member 76 covers the cylindrical guide portion 80a of the fixed member 80 that also serves as the yoke along the cylindrical inner periphery of the excitation coil 73, so that the magnetism generated by the excitation of the excitation coil 73 is efficiently generated. A magnetic circuit that passes well is formed, and the movable yoke member 76 and the plunger 75 can be moved together with an appropriate movable force .

The stopper member 82 that slides in the cylindrical guide portion 80a of the fixed member 80 is made of a highly rigid metal, and the cylindrical protrusion 82b protrudes from the front surface of the cylindrical main body 82a having an outer diameter substantially equal to the inner diameter of the cylindrical guide portion 80a. The cylindrical protrusion 82b is slidably fitted into the opening 81 formed by the position restricting portion 80b of the cylindrical guide portion 80a.
The stopper member 82 that slides inside the cylindrical guide portion 80a has its cylindrical main body 82a abutted against the position restricting portion 80b, and its forward sliding is restricted at a predetermined position, and the stopper member 82 is restricted by the position restricting portion 80b. The cylindrical protrusion 82b is fitted into the opening 81, and the front end face (front end face of the cylindrical protrusion 82b) facing the opening 81 of the stopper member 82 constitutes the same surface as the front surface of the position restricting portion 80b. (See FIG. 1).
In addition, the stopper member 82 has a cylindrical guide rod 82c protruding from the cylindrical main body 82a to the rear side.

A lid member 85 is attached to the rear opening of the cylindrical guide portion 80a of the fixing member 80.
The lid member 85 is a bolt having a male screw portion 85s that is screwed into a female screw portion 80s engraved in the cylindrical guide portion 80a, and the male screw portion 85s is screwed into the female screw portion 80s in the rear opening of the cylindrical guide portion 80a. And are fastened through a spacer 86.

The lid member 85 is formed with a guide hole 85c on the central axis for guiding the stopper member 82 by slidably inserting the cylindrical guide rod 82c of the stopper member 82 into the male screw portion 85s. When screwed into the cylindrical guide portion 80a, the guide hole 85c supports the column guide rod 82c and guides the stopper member 82 so as to slide smoothly so that the column guide rod 82c fits into the guide hole 85c. Configure .

A coil spring 87 provided around the cylindrical guide rod 82c of the stopper member 82 is sandwiched between the rear end surface of the column main body 82a of the stopper member 82 and the front end surface of the male screw portion 85s of the lid member 85. The stopper member 82 is biased forward.
Since the coil spring 87 as the biasing means is provided around the cylindrical guide rod 82c, the coil spring 87 is stably supported and the stopper member 82 can be biased effectively.

Since the stopper member 82 and the coil spring 87 are sequentially inserted into the cylindrical guide portion 80a of the fixing member 80 from the rear opening and the lid member 85 is attached to the rear opening, it can be easily assembled and the assembling property is good. .
Further, since the lid member 85 is a bolt having a male screw portion 85s, the lid member 85 is screwed into the female screw portion 80s of the cylindrical guide portion 80a to fix the lid member 85 to the rear opening of the cylindrical guide portion 80a, and the coil spring 87 is a stopper. Since it is interposed between the member 82 and the male screw portion 85s, the attachment of the lid member 85 is simple and the assemblability is further improved.

The electromagnetic solenoid 70 has the above-described structure, and the plunger 75 is used so as to receive a load from the outside in a direction in which the plunger 75 moves backward.
However, the external load is set smaller than the urging force of the coil spring 87.

  Therefore, in the electromagnetic solenoid 70, when the exciting coil 73 is demagnetized, the plunger 75 is moved backward by the external load, and is urged by the coil spring 87 as shown in FIG. It abuts on the cylindrical protrusion 82b of the stopper member 82 restricted to a predetermined position and stops at a predetermined stop position.

  When the exciting coil 73 is excited, referring to FIG. 2, the generated magnetism efficiently uses the magnetic circuit constituted by the cylindrical casing 71 that also serves as a yoke, the half cotters 78 and 78, the plunger guide member 74, and the fixed member 80. As is well known, the movable yoke member 76 and the plunger 75 in the middle are integrally moved against the external load to project the plunger 75 forward.

  When the excitation of the exciting coil 73 is stopped and demagnetized, the plunger 75 moves backward together with the movable yoke member 76 due to an external load, and is biased by the coil spring 87 and stopped by being restricted by the position restricting portion 80b. 3, immediately after the collision, as shown in FIG. 3, the plunger 75 is received by the stopper member 82 that is pushed backward and moves against the urging force of the coil spring 87. Can be absorbed and the collision noise can be suppressed.

  Then, from the state shown in FIG. 3, the plunger 75 is returned to the front together with the stopper member 82 by the urging force of the coil spring 87 overcoming the external load, and when the stopper member 82 is restricted by the position restricting portion 80b and stopped, FIG. As shown, the plunger 75 comes into contact and stops at a predetermined stop position.

The metal stopper member 82 does not sag even after many years of use, and the coil spring 87 only needs to have a larger urging force than the external load, so there is no fear of stagnation. The plunger 75 to be stopped is always positioned at a predetermined position with high accuracy and stopped.
Therefore, the electromagnetic solenoid 70 does not vary in the stroke amount of the plunger 75, and can operate the operated member accurately.

  The fixing member 80 also serving as a yoke is simple in that a position restricting portion 80b for restricting the sliding of the stopper member 82 forward is formed at the end of the cylindrical guide portion that slidably accommodates the stopper member 82 together with the coil spring 87. Thus, the electromagnetic solenoid 70 can be reduced in size and weight.

The variable valve operating apparatus 40 using the electromagnetic solenoid 70 will be described below with reference to FIGS.
The internal combustion engine 10 provided with the variable valve operating device 40 is a one-cylinder four-stroke internal combustion engine and is mounted on the motorcycle 1.
In the following description, the front, rear, left and right are determined based on the body of the motorcycle 1.

FIG. 4 shows an overall side view of the motorcycle 1 on which the internal combustion engine 10 is mounted.
The body frame 2 of the motorcycle 1 has a pair of left and right main frames 2m, 2m extending backwards slightly from the head pipe 2h and then bent downward to form steeply inclined portions 2ma, 2ma. Has reached.
Further, a pair of left and right down frames 2d, 2d extend downward from the head pipe 2h at an obliquely steep angle substantially parallel to the steeply inclined portion 2ma of the main frame 2m in a side view.

  The seat rails 2s, 2s extend rearward from the upper portions of the steeply inclined portions 2ma, 2ma of the main frames 2m, 2m through the gussets 2g, 2g, and the central portion of the seat rails 2s, 2s and the steeply inclined portions 2ma, 2ma. The back stays 2b and 2b connecting the lower part of the seat support the seat rails 2s and 2s.

In the body frame as described above, the front fork 3 is pivotally supported on the head pipe 2h, the front wheel Fw is pivotally supported at the lower end thereof, and the front end is pivotally supported below the steeply inclined portions 2ma and 2ma of the main frames 2m and 2m. The rear fork 4 extends rearward, a rear wheel Rw is pivotally supported at the rear end thereof, and a rear cushion 5 is interposed between the rear fork 4 and the gasset 2 g of the vehicle body frame 2.
A fuel tank 6 is installed in front of the main frames 2m and 2m, and a seat 7 is provided behind the fuel tank 6 and supported by seat rails 2s and 2s.

The internal combustion engine 10 suspended between the main frames 2m and 2m and the down frames 2d and 2d is an SOHC type air-cooled single cylinder four-cycle internal combustion engine, and a cylinder 11 is oriented in the vehicle body width direction with respect to the vehicle body. The cylinder block 14, the cylinder head 15, and the head cover 20 are suspended in an upright position by tilting slightly forward.
The fuel tank 6 covers the upper part of the head cover 20 at the upper part of the slightly tilted cylinder of the internal combustion engine 10.

  An intake pipe 8 extends rearward from the cylinder head 15 of the internal combustion engine 10 to the air cleaner 8a via a throttle body. An exhaust pipe 9 extends forward from the cylinder head 15 and bends downward to bend the internal combustion engine 10. The lower part extends rearward and reaches the muffler 9m on the right side of the rear wheel Rw.

Referring to FIG. 5, a crankcase 13 that supports the crankshaft 11 of the internal combustion engine 10 is formed with a transmission chamber 13 </ b> M that houses a transmission behind the crankcase 13 </ b> C in which the crankshaft 11 is disposed. From the mission chamber 13M, the output shaft 12 of the transmission protrudes to the left and constitutes a power unit.
Below the crank chamber 13C, an oil sump 13P is formed integrally with the bottom wall bulging somewhat downward to store oil.
The crankcase 13 forming the crank chamber 13C, the transmission chamber 13M, and the oil reservoir 13P has a left-right split structure.

On the front crank chamber 13C of the crankcase 13, a cylinder block 14 having one cylinder 14a and a cylinder head 15 are overlaid on the cylinder block 14 via a gasket. A cylinder head 15 and a cylinder block 14 are integrally fastened to the crankcase 13 together with 16, and a head cover 20 is covered above the cylinder head 15 via an elastic seal member 18 (see FIGS. 6 and 7).
The cylinder block 14, the cylinder head 15, and the head cover 20 stacked on the crankcase 13 extend upward from the crankcase 13 in a slightly forwardly inclined posture (see FIG. 5).

  A piston 31 is fitted in the cylinder 14a of the cylinder block 14 so as to be slidable back and forth (see FIG. 6), and the piston 31 and the crankshaft 11 are connected by a connecting rod 32 to constitute a crank mechanism.

A combustion chamber 15z is formed in the cylinder head 15 so as to face the piston 31 in the cylinder axial direction corresponding to the cylinder 14a. An intake port 15i extends rearward from the combustion chamber 15z and forwards from the combustion chamber 15z. An exhaust port 15e extends (see FIG. 6), and a spark plug 19 is attached to the ceiling wall of the combustion chamber 15z with the tip facing the combustion chamber 15z (see FIG. 7).

As shown in FIG. 6, an intake valve 33 and an exhaust valve 34 that are slidably supported by a valve guide integrally fitted to the cylinder head 15 are driven by a variable valve device 40 provided in the internal combustion engine 10. Thus, the intake opening of the intake port 15 i and the exhaust opening of the exhaust port 15 e are opened and closed in synchronization with the rotation of the crankshaft 11.

  Referring to FIGS. 6 and 7, in the variable valve operating apparatus 40, a single valve camshaft 41 is pivotally supported in the left-right direction on a camshaft holder 16 fixed on the cylinder head 15. This is a SOHC type valve mechanism. Rocker arm shafts 43e, 43i are supported by the camshaft holder 16 on the front and rear of the valve camshaft 41, and the intake rocker arm 44i is pivoted on the center of the rear rocker arm shaft 43i. The exhaust rocker arm 44e is pivotally supported by the front rocker arm shaft 43e so as to be swingable.

  A cylindrical steady cam member 42 having an intake cam lobe 42i and an exhaust cam lobe 42e formed side by side on the outer peripheral surface is press-fitted into the valve camshaft 41, and the steady cam member 42 is integrally removed from the valve camshaft 41. It is fitted.

  The intake rocker arm 43i has one end roller 43ir in contact with the intake cam lobe 42i of the steady cam member 42, the other end in contact with the upper end of the valve stem of the intake valve 33, and the other exhaust rocker arm 44e has one end roller 44er in the steady cam. The member 42 is in contact with the exhaust cam lobe 42e, the other end is in contact with the upper end of the valve stem of the exhaust valve 34, and the intake cam rocker arm 44i is rotated by rotation of the steady cam member 42 (intake cam lobe 42i, exhaust cam lobe 42e) together with the valve operating camshaft 41. The exhaust rocker arm 44e swings at a predetermined timing to open and close the intake valve 33 and the exhaust valve 34.

The valve camshaft 41 has a driven cam chain sprocket 36 fixed to the end of the left shaft (see FIG. 7).
On the other hand, a drive cam chain sprocket 35 is fitted on the crankshaft 11, and a cam chain 37 is bridged between the drive cam chain sprocket 35 and the driven cam chain sprocket 36 thereabove (see FIG. 5). ), The rotational power of the crankshaft 11 is transmitted to the rotation of the valve operating camshaft 41 through the cam chain 37 at a half speed of the crankshaft 11, and the intake rocker arm 44i and the exhaust rocker arm are synchronized with the crankshaft 11. The intake valve 33 and the exhaust valve 34 are driven to open and close at the required timing by swinging 44e.

In addition, cam chain chambers 14c, 15c, and 20c are formed as a single cavity on the left side of the cylinder block 14, cylinder head 15, and head cover 20 (see FIG. 7), and the cam chain chambers 14c, 15c, and 20c As shown in FIG. 5, the front side portion of the cam chain 37 spanned between the driving cam chain sprocket 35 and the upper driven cam chain sprocket 36 is slightly curved and extended vertically. The guide 38 is guided, and the rear rear portion is in contact with the tension slipper 39 that is curved in an arcuate shape to maintain an appropriate tension on the cam chain 37 (see FIG. 5).
The tension slipper 39 is pressed behind by a tensioner lifter 39t.

The valve camshaft 41 pivotally supported by the camshaft holder 16 in the left-right direction is a cylindrical member, and a spline forming portion 41c and a spigot outer peripheral surface portion 41i are formed side by side at the center in the axial direction. An exhaust cam lobe 42e and an intake cam lobe 42i are formed side by side on the right side of the outer peripheral surface portion 41i.
A long hole 41s is drilled at a predetermined position perpendicular to the axial direction from the wide spline groove 41cs of the spline forming portion 41c to the spigot outer peripheral surface portion 41i.
The valve camshaft 41 including the steady cam member 42 is integrally formed with high accuracy by cold forging.

Variable cam member 50 slidably fitted in the valve operating cam shaft 41 includes a spigot inner peripheral surface portion corresponding to the spline groove line of the inner spigot outer periphery of the valve operating cam shaft 41 on the peripheral surface surface portion 41i and the spline forming section 41c Spline ridges are formed, and a variable cam lobe 50e is formed on the right side of the outer peripheral surface of the variable cam member 50. The variable cam lobe 50e is an EGR cam lob, and most of it has the same diameter as the basic circle of the exhaust cam lobe 42e. Alternatively, a basic circle with a slightly smaller diameter is formed, and a cam mountain with a small lift amount protrudes in part.

The variable cam member 50 is fitted and inserted into the valve camshaft 41 from the left side, and the spigot fitting is simultaneously fitted with the spigot outer peripheral surface portion 41i of the valve camshaft 41 and the spline forming portion 41c. The slide rod 53 is slidably fitted into the shaft hole, and both ends of the connecting pin 54 penetrating the pin hole of the slide rod 53 and the long hole 41 s of the valve operating cam shaft 41 are engaged with the variable cam member 50.
Therefore, when the slide rod 53 is slid in the axial direction, the connecting pin 54 is guided and moved together with the elongated hole 41s of the valve camshaft 41, and the variable cam member 50 is moved in the axial direction integrally with the connecting pin 54. To be displaced.
A female thread is engraved on the inner peripheral surface of the right end of the central shaft hole of the valve camshaft 41. When the coil spring 56 is inserted into the central shaft hole from the right and the flanged bolt 57 is screwed into the female thread, the coil spring 56 Is sandwiched between the slide rod 53 and the flanged bolt 57 to urge the slide rod 53 to the left, and the slide rod 53 is restricted to the position where the connecting pin 54 contacts the left long end of the long hole 41s. The left end of the slide rod 53 protrudes leftward from the valve operating cam shaft 41.

  In the valve camshaft 41, a bearing 46 is fitted to the right end journal portion protruding to the right side of the intake cam lobe 42i, and the left cylindrical portion on the left side of the spline forming portion 41c into which the variable cam member 50 is spline-fitted. 45 is inserted, and the flange member 47 is press-fitted at a predetermined relative angle through a key to sandwich the bearing 45 with the spline forming portion 41c.

In this small assembled state, the valve camshaft 41 is inserted from the left side into the shaft holes of the left and right bearing walls 16L and 16R that project opposite to the left and right of the camshaft holder 16, and the right bearing 46 is connected to the right bearing wall 16R. The valve 45 is fitted to the shaft hole, the left bearing 45 is fitted to the shaft hole of the left bearing wall 16L, and the valve camshaft 41 is rotatably supported by the camshaft holder 16 via the bearings 45 and 46. It rotates together with the variable cam member 50 integrally with the exhaust cam lobe 42e and the intake cam lobe 42i at the steady cam portion (see FIG. 7).
The right bearing 46 is positioned in contact with the stepped portion of the right bearing wall 16R, and the left bearing 45 is positioned on the left side by a stop plate 59 fixed to the left bearing wall 16L by a bolt 58, so that the left bearing 45 is removed. This is prevented (see FIG. 7).

  When the slide rod 53 is moved to the left by the coil spring 56, as shown by the solid line in FIG. 7, the variable cam member 50 is slid to the left via the connecting pin 54, and is moved from the exhaust cam lobe 42e. When the distance is greater than a predetermined distance, the roller 44er of the exhaust rocker arm 44e does not contact the variable cam lobe 50e but contacts only the exhaust cam lobe 42e, and the exhaust valve 34 opens and closes at the normal exhaust valve timing.

On the other hand, when the slide rod 53 is pushed rightward against the urging force of the coil spring 56, the variable cam member 50 slides rightward via the connecting pin 54 as shown by a two-dot chain line in FIG. The variable cam member 50 is regulated at a position where the connecting pin 54 is displaced and abuts the right long end of the long hole 41s. At this time, the variable cam member 50 is slightly spaced from the exhaust cam lobe 42e on the left side of the stationary cam member 42. Since the roller 44er of the exhaust rocker arm 44e contacts the exhaust cam lobe 42e and the variable cam lobe 50e, the variable cam lobe 50e is separated from the normal opening / closing timing of the exhaust valve 34 by the exhaust cam lobe 42e. Exhaust valve 34 is opened and closed by
The opening / closing of the exhaust valve 34 by the variable cam lobe 50e executes EGR (exhaust gas recirculation).

A variable valve timing drive mechanism 60 that projects to the left from the valve camshaft 41 and presses the left end of the slide rod 53 biased to the left by the coil spring 56 to the right to drive the slider mechanism 52 is a driven cam chain sprocket It is provided on the left side of 36 (see FIG. 7).
The variable valve timing drive mechanism 60 includes the above-described electromagnetic solenoid 70 as an actuator and a swing arm 65 that transmits the drive of the plunger 75 of the electromagnetic solenoid 70 to the slide rod 53. The electromagnetic solenoid 70 is a ceiling wall 20u of the head cover 20. The swing arm 65 is pivotally supported by the cam chain chamber 20c of the head cover 20 so as to be swingable.

  The head cover 20 has a substantially rectangular bowl shape with a ceiling wall 20u and a rectangular cylindrical peripheral wall 20s, and the center portion in the front-rear direction of the portion covering the cam chain chamber 20c of the ceiling wall 20u protrudes thickly upward. 21, and projecting boss portions 22, 22 are formed so as to project continuously on both front and rear sides of the central projecting portion 21.

The central protrusion 21 has a central gap 21c with a predetermined width at the center in the front-rear direction from the cam chain chamber 20c side, and a circular hole 21h drilled to the left from the right side surface of the central protrusion 21 is the center. The gap 21c is reached.
An internal thread is engraved on the protruding boss portions 22 and 22 from the right side surface.

From the cylindrical casing 71 of the electromagnetic solenoid 70, mounting flange portions 71f and 71f are extended in the front-rear direction, and attached to the central projecting portion 21 of the head cover 20 from the right side with the plunger 75 on the left side.
That is, the plunger guide member 74 protruding to the left from the cylindrical casing 71 of the electromagnetic solenoid 70 is fitted into the circular hole 21h of the central protruding portion 21, and the mounting flange portions 71f and 71f extending forward and backward from the cylindrical casing 71 are protruding boss portions. 22, 22 abuts against the bolt 63, 63 mounting flange portion 71f, the solenoid 70 is screwed into the internal thread of the projecting boss portions 22 through the 71f is above the ceiling wall 20u of the head cover 20 Fixed.

In the electromagnetic solenoid 70 thus mounted, the axial direction in which the plunger 75 moves is parallel to the axial direction in which the valve operating cam shaft 41 and the slide rod 53 in the central shaft hole slide.
The plunger 75 of the electromagnetic solenoid 70 is in a position where the slide rod 53 is translated in the cylinder axis direction which is the central axis of the cylinder 14a.

A plurality of ribs are formed on the inner surface of the head cover 20, and a pair of guide walls 23, 23 are symmetrically formed on both the front and rear sides of the central space 21 c formed in the central protrusion 21. Yes.
The guide walls 23, 23 have end faces 23a, 23a along the front and rear side faces 21a, 21a facing each other across the central gap 21c, extend in the front-rear direction, and are bent and developed obliquely leftward in the middle. .

The front and rear side surfaces 21a and 21a constituting the central gap 21c and the end surfaces 23a and 23a of the front and rear guide walls 23 and 23 are the same surface.
A pivot bolt 64 that pivotally supports the swing arm 65 is installed at a predetermined position on the front and rear side surfaces 21a, 21a constituting the central gap 21c.

  The swing arm 65 is a straight bar-shaped arm member having a U-shaped cross section, and is disposed in the cam chain chamber 20c of the head cover 20 so as to be oriented substantially parallel to the cylinder axial direction (substantially in the vertical direction). The side plate portion oriented substantially in the vertical direction includes a shaft support hole through which the pivot bolt 64 passes coaxially at a position offset upward from the center, and is formed to be tapered in the vertical direction from the portion of the shaft support hole.

  The swing arm 65 is disposed along the left surface of the driven cam chain sprocket 36 in the cam chain chamber 20c with the opening side having a U-shaped cross section directed leftward and oriented substantially parallel to the cylinder axis direction. At that time, the substantially upper half of the swing arm 65 is inserted into the central gap 21c of the central protrusion 21, and the pivot bolt 64 passes through the shaft support hole of the swing arm 65 and is installed on the front and rear protruding bosses 22. Thus, the swing arm 65 is pivotally supported by the pivot bolt 64.

The swing arm 65 swings so that the upper half portion is sandwiched between the front and rear side surfaces 21a and 21a constituting the central gap 21c, and the lower half portion is the front and rear guide walls 23 and 23 that are flush with the front and rear side surfaces 21a and 21a. It is guided so as to be sandwiched between the end faces 23a, 23a, and smoothly swings without causing a torsion in the torsional direction.
Referring to FIG. 7, a slide rod 53 that slides in the central shaft hole 41h of the valve camshaft 41 is substantially the same as the mating surface S of the head cover 20 and the cylinder head 15 (the lower surface of the elastic seal member 18). They are on the same plane, and the lower end of the swing arm 65 slightly protrudes below the mating surface S of the head cover 20 and the cylinder head 15.

  Since the swing arm 65 is pivotally supported by the pivot bolt 64 at a position offset from the center to the top, the lower portion is longer than the upper portion of the pivot bolt 64. As shown in FIG. The pivot bolt 64 serving as the fulcrum P of the moving arm 65 is positioned above the driven cam chain sprocket 36 fixed to the valve camshaft 41, and the head cover is attached to the connecting plate portion 65a at the upper end of the pivot bolt 64. A plunger 75 projecting leftward from the plunger guide member 74 of the electromagnetic solenoid 70 fixed above the ceiling wall 20u of the 20 abuts, and a coil projecting leftward from the valve operating camshaft 41 to the lower end of the swing arm 65 The slide rod 53 biased by the spring 56 contacts.

Referring to FIG. 7, the straight bar-like swing arm 65 has a force point Q at the upper end point where the plunger 75 of the electromagnetic solenoid 70 abuts when the swing center of the swing arm 65 by the pivot bolt 64 is a fulcrum P. Yes, the lower end point that contacts the slide rod 53 is the action point R, and the swing arm 65 receives the plunger 75 protruding leftward by the excitation drive of the electromagnetic solenoid 70 at the upper end force point Q and swings to the lower end. The point of action R acts on the slide rod 53 and slides the slide rod 53 to the right against the urging force of the coil spring 56.
When the electromagnetic solenoid 70 is demagnetized, the slide rod 53 slides to the left by the biasing force of the coil spring 56, swings the swing arm 65, and the plunger 75 is pushed right.

  That is, when the electromagnetic solenoid 70 is demagnetized, the slide rod 53 slides to the left by the urging force of the coil spring 56, and the variable cam member 50 is connected via the connecting pin 54 as shown by the solid line in FIG. Slid to the left and away from the steady cam member 42, and the exhaust valve 34 opens and closes at normal exhaust valve timing.

  When the electromagnetic solenoid 70 is excited, the plunger 75 protrudes to the left, and the swing arm 65 swings until the connecting pin 54 contacts the right long end of the long hole 41s. As shown by a two-dot chain line in FIG. 7, the variable cam member 50 slides and displaces to the right through the connecting pin 54, and the exhaust cam lobe 42e of the steady cam portion is slid to the right against the urging force. In addition to the normal opening / closing timing of the exhaust valve 34 by the exhaust cam lobe 42e, the exhaust valve 34 is opened / closed by the variable cam lobe 50e.

  The opening / closing timing of the exhaust valve 34 different from the normal exhaust timing is executed at a predetermined timing overlapping the opening timing of the intake valve 33, and the exhaust gas remaining in the exhaust passage by the opening of the exhaust valve 34 is removed from the combustion chamber. It is possible to realize so-called EGR (exhaust gas recirculation) for returning to 15z and for combustion.

In the swing arm 65, the distance PR from the fulcrum P to the action point R is longer than the distance PQ from the fulcrum P to the force point Q, and the lever ratio r (= PR /) is the ratio of the distance PR to the distance PQ as a lever. PQ) is large.
The swing arm 65 is disposed such that its longitudinal direction is substantially parallel to the cylinder axis direction (substantially in the vertical direction), and the fulcrum P of the swing arm 65 is fixed to the valve camshaft 41. Since it is positioned above the sprocket 36, the swing arm 65 can be compactly incorporated into the valve operating apparatus while the lever ratio r is increased.

  As described above, the electromagnetic solenoid 70 used in the variable valve timing drive mechanism 60 of the variable valve operating apparatus 40 has an external load (the biasing force of the coil spring 56) when the excitation of the excitation coil 73 is stopped and demagnetized. ), The plunger 75 moves backward and comes into contact with the stopper member 82 urged by the coil spring 87 so that the plunger 75 is always accurately positioned and stopped at a predetermined stop position. Therefore, it is possible to accurately change the valve timing by accurately operating the variable cam member 50 by sliding the slide rod 53 via the swing arm 65.

Since the swing arm 65 has a longer distance PR from the fulcrum P to the action point R than the distance PQ from the fulcrum P to the force point Q, and the lever ratio r (= PR / PQ) is large, the sliding of the slide rod 53 The speed, that is, the moving speed of the variable cam member 50 is fast, so that the reaction is fast and the change of the valve timing can be executed with higher accuracy.
The stroke amount of the plunger 75 of the electromagnetic solenoid 70 can be small, and the electromagnetic solenoid 70 can be downsized.

A structure of an electromagnetic solenoid 100 according to another embodiment will be described with reference to FIG.
The electromagnetic solenoid 100 is configured by using the same member as the electromagnetic solenoid 70 of the previous embodiment described above, and therefore the same member is indicated by the same reference numeral.
The cylindrical guide portion 80a of the fixed member 80 is formed with a bottom wall 80d that opens forward and closes the rear opening on the plunger 75 side, and the bottom wall 80d has a flange portion.
A position restricting member 80b, which is a separate annular member, is fitted to the inner peripheral surface of the front opening of the cylindrical guide portion 80a and fixed by caulking.

Inside the cylindrical guide portion 80a, a bottomed cylindrical stopper member 82 is slidably fitted with the cylindrical protrusion 82b facing the plunger 75 side. A coil spring 87 is interposed between the cylindrical protrusion 82 b and the bottom wall 80 d of the fixing member 80.
The cylindrical protrusion 82b of the stopper member 82 has a reduced diameter at the front end and is fitted into the opening 81 of the annular position restricting member 80b.
That is, the stopper member 82 biased by the coil spring 87 is restricted from sliding forward at a predetermined position by the cylindrical protrusion 82b coming into contact with the position restricting member 80b.

  Therefore, when the electromagnetic solenoid 70 is demagnetized and the plunger 75 moves backward and collides with the stopper member 82, the stopper member 82 moves backward together with the plunger 75 against the coil spring 87, so that the impact is absorbed and the collision noise is reduced. The stopper member 82, which has been retracted once, moves forward together with the plunger 75 by the coil spring 87 and is regulated by the position regulating member 80b. Therefore, the plunger 75 can be returned to a predetermined position and positioned and stopped with high accuracy. The stroke amount of the plunger 75 can be kept constant.

The fixing member 80 has a simple structure composed of the cylindrical guide portion 80a and the bottom wall 80d, is easy to form and does not require a separate member such as the lid member 85 as in the above embodiment, The number of parts can be reduced, the assembly performance of the electromagnetic solenoid 70 can be improved, and the electromagnetic solenoid 70 can be reduced in size and weight because there is no protrusion like the lid member 85.
When assembling the stopper member 82 to the fixing member 80, the stopper member 82 is inserted into the cylindrical guide portion 80a of the fixing member 80 from the opening side through the coil spring 87, and the inner periphery of the opening portion of the cylindrical guide portion 80a is inserted. Since the position regulating member 80b is fitted on the surface and fixed by caulking, the assembling work is simple and the assembling property can be further improved.

40 ... Variable valve operating device, 41 ... Valve operating cam shaft, 41s ... Long hole, 41h ... Center shaft hole, 41cs ... Spline groove, 42 ... Stationary cam member, 42i ... Intake cam lobe, 42e ... Exhaust cam lobe, 44i ... Intake Rocker arm, 44e ... Exhaust rocker arm, 43ir, 44er ... Roller, 50 ... Variable cam member, 50cs ... Spline protrusion, 52 ... Slider mechanism, 53 ... Slide rod, 54 ... Connecting pin, 56 ... Coil spring,
60 ... Variable valve timing drive mechanism, 63 ... Bolt, 64 ... Pivot bolt, 65 ... Oscillating arm,
70 ... Electromagnetic solenoid, 71 ... Cylindrical casing, 72 ... Bobbin, 73 ... Excitation coil, 74 ... Plunger guide member, 75 ... Plunger, 76 ... Movable yoke member, 76a ... Cylindrical wall, 76b ... Bottom wall, 77 ... Sliding member, 78 ... Half-cotta,
80 ... fixing member, 80a ... cylindrical guide part, 80b ... position restricting part, 80c ... flange part, 80s ... female screw part, 81 ... open hole, 82 ... stopper member, 82a ... column body, 82b ... column projection, 82c ... Cylindrical guide rod, 85 ... Lid member, 85s ... Male thread, 85c ... Guide hole, 86 ... Spacer, 87 ... Coil spring,
100 ... Electromagnetic solenoid.

Claims (10)

A plunger (75) is supported on the central axis of the exciting coil (73) wound in a cylindrical shape so as to be movable in the axial direction, and the plunger (75) resists an external load by exciting the exciting coil (73). ) Protrudes forward in the forward direction, and in the electromagnetic solenoid (70) in which the plunger (75) moves backward by an external load due to demagnetization of the excitation coil (73),
A stopper member (82) for receiving the plunger (75) oppositely is supported by the fixing member (80) so as to be slidable in the axial direction,
The stopper member (82) is urged forward by an urging means (87), and forward sliding is restricted at a predetermined position by a position restricting portion (80b) constituted by the fixing member (80). And
The electromagnetic solenoid, wherein the plunger (75) contacts the stopper member (82) regulated at a predetermined position by the position regulating part (80b) when retreating. The fixing member (80) also serves as a yoke, and has a cylindrical guide portion (80a) that houses the stopper member (82) and guides it slidably in the front-rear direction.
The cylindrical guide portion (80a) has the position restricting portion (80b) having an opening (81) whose diameter is reduced at the front end on the plunger (75) side,
The stopper member facing the opening (81) of the position restricting portion (80b) in a state where the stopper member (82) is urged by the urging means (87) and is in contact with the position restricting portion (80b). The electromagnetic solenoid according to claim 1, wherein the plunger (75) is brought into contact with the front end face of (82) when retreating. The plunger (75) is supported movably in the axial direction by a plunger guide member (74) that also serves as a yoke,
A movable yoke member (76) having a substantially bottomed cylindrical shape has a bottom wall (76b) at a portion protruding rearward from the plunger guide member (74) of the plunger (75) behind the plunger guide member (74). Is inserted and supported integrally,
The cylindrical wall (76a) of the movable yoke member (76) covers the end of the fixed member (80) along the inner circumference of the exciting coil (73). 2. The electromagnetic solenoid according to 2. A lid member (85) is attached to the rear opening of the cylindrical guide portion (80a) of the fixing member (80),
The electromagnetic solenoid according to claim 2 or 3, wherein the urging means (87) is interposed between the stopper member (82) and the lid member (85). A female screw (80s) is formed on the inner periphery of the cylindrical guide portion (80a) of the fixing member (80),
A male screw part (85s) is formed on the lid member (85),
The male screw part (85s) is screwed into the female screw (80s) of the cylindrical guide part (80a), and the lid member (85) is fixed to the rear opening of the cylindrical guide part (80a),
The electromagnetic solenoid according to claim 4, wherein the biasing means (87) is interposed between the stopper member (82) and the male screw portion (85s) of the lid member (85). The stopper member (82) is formed with a cylindrical guide rod (82c) protruding from the cylindrical main body (82a) to the rear side,
The lid member (85) is formed with a guide hole (85c) for slidably fitting the cylindrical guide rod (82c) into the male screw portion (85s) to guide the stopper member (82),
The electromagnetic solenoid according to claim 5, wherein the biasing means is a coil spring (87) and is provided around the cylindrical guide rod (82c). The cylindrical guide portion (80a) is formed with a bottom wall (80d) that opens the front on the plunger (75) side and closes the rear opening,
The electromagnetic solenoid according to claim 2, wherein the position restricting portion (80b) is an annular member fitted into a front opening of the cylindrical guide portion (80a).   The electromagnetic solenoid according to claim 7, wherein the position restricting portion (80b) is fitted and fixed by caulking to an inner peripheral surface of a front opening portion of the cylindrical guide portion (80a). The movement of the plunger (75) by the driving of the electromagnetic solenoid (70) according to any one of claims 1 to 8 is performed on the variable cam member (50) via a power transmission mechanism (65, 53, 54). The valve timing is changed by transmitting to the operation,
The variable valve operating apparatus, wherein the external load (56) acting on the plunger (75) is incorporated in the power transmission mechanism (65, 53, 54). The power transmission mechanism (65, 53, 54) is pivotally supported by a fulcrum (P), and the movement of the plunger (75) is input by a force point (Q) to swing and slide at an operating point (R) ( 53) and a swing arm (65) with a large lever ratio (r) for sliding
The variable valve operating apparatus according to claim 9, wherein the variable cam member (50) moves together with the sliding member (53) to change the valve timing.

Images