JP4295171B2 - Valve operating device for internal combustion engine - Google Patents

Description

  The present invention relates to a valve operating apparatus for an internal combustion engine capable of adjusting, for example, a valve lift amount of an intake valve when assembling each component member.

  As this type of conventional valve gear, there is one described in the following Patent Document 1 previously filed by the present applicant.

  Briefly, this valve operating device is applied to the intake valve side, and is driven in such a manner that the shaft center is eccentric from the shaft center of the drive shaft on the outer periphery of the drive shaft rotating in synchronization with the rotation of the crankshaft. A cam is provided, and the rotational force of the drive cam is transmitted through a multi-link transmission mechanism, and the cam surface slides on the upper surface of the valve lifter at the upper end of the intake valve to control the intake valve. It has a swing cam that opens against the spring force of the spring.

  The transmission mechanism includes a rocker arm that is disposed above the swing cam and is swingably supported by the control shaft, an annular one end is fitted to the outer peripheral surface of the drive cam, and the other end is one end of the rocker arm. A link arm that is rotatably connected to the part via a pin, one end part is rotatably connected to the other end part of the rocker arm via a pin, and the other end part is connected to the cam nose part of the swing cam via a pin. And a link rod connected rotatably.

  The control shaft is rotatably supported by a bearing provided at the upper end of the cylinder head, and a control cam whose shaft center is eccentric from the control shaft axis by a predetermined amount is fixed to the outer peripheral surface thereof. Has been.

  Then, the swing fulcrum of the rocker arm is changed by changing the rotational position of the control cam through the control shaft by an actuator composed of an electric motor, screw transmission means, etc. according to the engine operating state, and The rolling contact position of the cam surface with respect to the upper surface of the valve lifter is changed to variably control the valve lift amount of the intake valve according to the engine operating state.

  In addition, such a valve operating apparatus requires many components such as the transmission mechanism using a multi-joint link mechanism, and due to these manufacturing errors and assembly errors, each intake valve Variations in the valve lift amount are likely to occur, and in particular, variations in the valve lift amount among the cylinders are likely to occur.

Therefore, in this conventional valve operating apparatus, after the components such as the transmission mechanism are assembled on the cylinder head by attaching the valve spring to the drive shaft or the control shaft in the radial direction, the bearing member is mounted. The valve lift amount of each intake valve is adjusted by removing the respective pins, replacing the link rods, and changing their lengths.
JP 2001-123809 A

  However, in the conventional valve operating apparatus, in order to adjust the length of the link rod, the link rod is once assembled to a rocker arm or a swing cam, and the valve lift amount is measured. Must be removed from the side of the link rod using a tool, another link rod with a different length must be selected, and each pin must be inserted again from the side and connected.

  Therefore, the lift adjustment work becomes complicated, and in particular, since each pin has to be inserted and removed from the side of the link rod where the space is narrow by using a tool, the insertion and removal work becomes complicated and the lift adjustment work efficiency is improved. The decline and cost increases are forced.

The present invention has been devised in view of the technical problem of the conventional variable valve operating device. The invention according to claim 1 is driven to rotate by the crankshaft of the engine, and a drive cam is integrally formed on the outer periphery. A drive shaft fixed to the shaft, and is supported in a swingable manner. One end side converts the rotational force transmitted from the drive cam into a swing motion and transmits it to the other end side, and the other end side swings in the swing direction. A rocker arm with a through-hole formed along the end, a link rod linked to the other end of the rocker arm on one end side, and a base portion swingably connected to the other end side of the link rod, forming a male threaded portion on the outer periphery An insertion member that swings integrally with the rocker arm with the tip end inserted through the penetration portion, and an opening and closing of the engine valve by swinging motion transmitted from the rocker arm via the insertion member and the link rod Rocking Via a cam, and adjusting mechanism for adjusting the position of the insertion direction of the insertion member relative to the penetrating portion, the male screw portion of the distal end portion projecting from the upper end opening of the through portion is inserted into the through portion of the insertion member And fixing means for screwing into the male threaded portion from the opposite side of the insertion member with respect to the insertion direction when the insertion member is fixed to the other end side of the rocker arm.

  According to this invention, when assembling each component member such as a link rod and a rocker arm, the lift amount of the engine valve can be adjusted by the adjustment mechanism, and the insertion member can be inserted into the through portion by this adjustment mechanism. It can be fixed by fixing means from the opposite side of the direction. For this reason, the adjustment work of this valve lift becomes easy.

According to a second aspect of the present invention, the adjusting mechanism is sandwiched between the stepped portion provided on the insertion member so as to protrude in the radial direction and the stepped portion and the rocker arm via the fixing means. It is characterized by comprising an adjustment shim.

  According to this invention, when adjusting the valve lift amount, for example, an adjustment shim where there is an error in the lift amount between the cylinders is selected in advance, and the adjustment shim is sandwiched between the stepped portion and the rocker arm. Specifically, the adjustment shim can be attached and detached and the fixing means can be fixed from the insertion direction of the insertion member through the penetrating portion, that is, the rocker arm swinging direction, so that the lift adjustment operation is facilitated. .

  In addition, since the structure of the adjusting mechanism can be simplified, the manufacturing cost can be reduced. According to a third aspect of the present invention, the adjusting mechanism includes a stepped portion provided on the insertion member so as to protrude in the radial direction, and is fitted into the insertion member, and is abutted and locked to the stepped portion. The screw adjusting member has a male screw portion formed on the outer periphery, and a female screw portion formed on the inner periphery of the penetrating portion and screwed into the male screw portion of the screw adjusting member.

  According to this invention, when adjusting the valve lift, the screwing amount of the screw adjusting member with respect to the penetrating portion is adjusted via the female screw portion of the penetrating portion and the male screw portion of the screw adjusting member, and then fixed by the fixing means. ing.

  As described above, the adjustment operation of the adjustment shim is not required as in the second aspect of the present invention by simply adjusting the screwing amount of the screw adjustment member, so that the lift adjustment operation is further facilitated.

  Hereinafter, embodiments of a valve operating apparatus for an internal combustion engine according to the present invention will be described in detail with reference to the drawings. In this embodiment, a variable mechanism that is applied to the intake valve side of a multi-cylinder internal combustion engine, includes two intake valves per cylinder, and makes the valve lift of the intake valve variable according to the engine operating state. I have.

  As shown in FIGS. 5 and 6, the valve operating apparatus in this embodiment includes a pair of intake valves 2 and 2 per cylinder that are slidably provided on a cylinder head 1 via a valve guide (not shown), an engine, An internal hollow drive shaft 3 disposed in the front-rear direction, a camshaft 4 disposed for each cylinder and supported coaxially and rotatably on the outer peripheral surface of the drive shaft 3, The drive cam 5 integrally fixed at a predetermined position and the valve lifters 6, 6 provided integrally at both ends of the camshaft 4 and disposed at the upper ends of the intake valves 2, 2 are slid. A pair of oscillating cams 7, 7 that are in contact with each other to open the intake valves 2, 2 and the drive cam 5 and the oscillating cams 7, 7 are linked to each other, and the rotational force of the drive cam 5 is controlled by the oscillation cam. 7 and 7 as a swinging force (valve opening force), and the operating position of the transmission mechanism 8 is variable. And a control mechanism 9 that.

  The intake valves 2 and 2 are closed in a closing direction by valve springs 10 and 10 mounted between a bottom portion of a substantially cylindrical bore housed in an upper end portion of the cylinder head 1 and a spring retainer at the upper end portion of the valve stem. It is energized.

  The drive shaft 3 is disposed along the longitudinal direction of the engine, and both ends thereof are rotatably supported by bearings (not shown) provided at the top of the cylinder head 1 and are also provided at one end. Rotational force is transmitted from the crankshaft of the engine via an external driven sprocket and a timing chain wound around the driven sprocket.

  The camshaft 4 is formed in a substantially cylindrical shape along the axial direction of the drive shaft 3, and a support shaft hole that is rotatably supported on the outer peripheral surface of the drive shaft 3 is formed through the inner shaft direction. A large-diameter cylindrical journal portion 4a formed at the center position is rotatably supported by a cam bearing (not shown).

  The drive cam 5 is formed in a substantially disc shape, and a fixing cylindrical portion is integrally provided on one side thereof, and this cylindrical portion is fixed at a predetermined position in the axial direction of the drive shaft 3. The pin 12 is integrally fixed to the outer periphery of the drive shaft 3, and the outer peripheral surface is formed in an eccentric cam profile, so that the shaft center Y is a predetermined amount in the radial direction from the shaft center X of the drive shaft 3. Is just offset.

  Each of the swing cams 7 has a substantially raindrop shape with the same shape, and the base end side swings about the axis X of the drive shaft 3 via the cam shaft 4 and swings. On the lower surface of the cam 7, cam surfaces that are in contact with predetermined positions on the upper surface of each valve lifter 6 are formed.

  The transmission mechanism 8 includes a rocker arm 13 disposed above the drive shaft 3, a link arm 14 linking the one end 13 a of the rocker arm 13 and the drive cam 5, and the other end 13 b of the rocker arm 13. A link rod 15 that links the cam nose portion of the moving cam 7 is provided.

  As shown in FIGS. 1 to 4, the rocker arm 13 has a support hole 13c penetratingly formed in a central cylindrical base from the lateral direction, and swings to a control cam 25 described later via the support hole 13c. It is supported freely. One end 13a of the rocker arm 13 has a pin 30 integrally projecting from the side of the tip, while the other end 13b is formed in a substantially cylindrical shape along the vertical direction of the engine. A support hole 16 that is a penetrating portion is formed to penetrate along the vertical direction.

  The link arm 14 includes a large-diameter annular portion 14a and a projecting end 14b projecting at a predetermined position on the outer peripheral surface of the annular portion 14a. The drive cam is located at the center of the annular portion 14a. A fitting hole 14c is formed in the outer peripheral surface of the pin 5 so as to be freely rotatable, and a pin hole through which the pin 30 is rotatably inserted is formed in the protruding end 14b.

  The link rod 15 is formed in a substantially U-shaped cross section by press molding, and the inner side is bent in a substantially U-shape for compactness, and has a parallel two-plate shape. Pin holes 15c and 15d are formed in both end portions 15a and 15b so as to penetrate in the lateral direction.

The other end portion 15b of the link rod 15 is rotatably linked to the cam nose portion of the swing cam 7 via a pin 21 inserted through the pin hole 15d.
On the other hand, one end portion 15a of the link rod 15 is linked to the other end portion 13b of the rocker arm 13 by a pin 20 inserted through the pin hole 15c and a support member 17 which is an insertion member inserted and supported by the support hole 16. Yes.

  That is, the support member 17 includes a base portion 18 disposed in a sandwiched state between the two plate-like one end portions 15a and 15a of the link rod 15, and a seating surface 18a which is a flat step portion of the base portion 18. And a shaft portion 19 integrally fixed to the center of the seating surface 18a.

  The base portion 18 has a pin insertion hole 18b through which the pin 20 is inserted, and the seating surface 18a is formed in a relatively wide area of a substantially flat rectangular shape. The lower surface of the seat is seated.

  The shaft portion 19 has a male screw portion 19 b formed on the outer periphery of the tip portion 19 a, and the tip portion 19 a protrudes from the upper end opening of the support hole 16 with the entire length L fitted in the adjustment shim 23. The female screw portion 22a of the nut 22 as a fixing means is screwed to the male screw portion 19b at the protruding tip end portion 19a.

  In addition, the adjustment shim 23 is fitted into the shaft portion 19 through an insertion hole 23a. The adjustment shim 23 is formed in an annular washer shape, and a plurality of adjustment shims having different thicknesses are prepared in advance. The adjustment shim 23 and the seating surface 18a of the support member 17 constitute an adjustment mechanism.

  The control mechanism 9 includes a control shaft 24 disposed above the drive shaft 3, a control cam 25 that is integrally fixed to the outer periphery of the control shaft 24 and serves as a swing fulcrum of the rocker arm 13, and the control shaft 24. And an actuator (not shown) for controlling the rotation of the motor.

  The control shaft 24 is disposed in the longitudinal direction of the engine in parallel with the drive shaft 3 and is rotatably supported by a bracket provided at the upper end of a bearing (not shown). On the other hand, the control cam 25 has a cylindrical shape, and the axial center position is deviated from the central axis of the control shaft 24 by a predetermined amount by the thick portion.

  The actuator includes an electric motor (not shown) fixed to the rear end of the cylinder head 1 and screw transmission means for transmitting the rotational driving force of the electric motor to the control shaft 24.

  The electric motor is constituted by a proportional DC motor, and is driven by a control signal from a controller (not shown) that detects the operating state of the engine. This controller includes various sensors such as a crank angle sensor that detects the engine speed, an air flow meter that detects the intake air amount, a water temperature sensor that detects the engine water temperature, and a potentiometer that detects the rotational position of the control shaft 24. The detection signal is fed back to detect the current engine operating state by calculation or the like, and a control signal is output to the electric motor.

  Hereinafter, the valve lift amount varying operation of the present embodiment will be briefly described. First, for example, in a low rotation range of the engine, the electric motor is rotationally driven by the controller, and this rotational torque is transmitted to the screw transmission means to rotate. As a result, the control shaft 24 is driven to rotate by a predetermined amount in one direction. Therefore, the control cam 25 rotates in one direction, the shaft center rotates around the shaft center of the control shaft 24 with the same radius, and the thick portion moves away from the drive shaft 3 upward. As a result, the pivotal support point of the other end portion 13b of the rocker arm 13 and the link rod 15 moves upward with respect to the drive shaft 3, so that each swing cam 7 is connected to the cam nose portion side via the link rod 15. Forced to be raised.

  Therefore, when the drive cam 5 rotates and pushes up the one end portion 13a of the rocker arm 13 via the link arm 14, the valve lift amount is transmitted to the swing cam 7 and the valve lifter 6 via the link rod 15. The lift amount of the intake valves 2 and 2 is sufficiently small.

  In addition, when the engine is shifted to the high engine speed region, when the electric motor is reversely rotated by the controller and the screw transmission means is rotated in the same direction, the control shaft 24 rotates the control cam 25 in the other direction along with this rotation. The axis moves downward. For this reason, the entire rocker arm 13 is moved in the direction of the drive shaft 3 and the cam nose portion of the rocking cam 7 is pressed downward via the link rod 15 by the other end portion 13b. Turn counterclockwise by a predetermined amount.

Therefore, the contact position of the cam surface with respect to the upper surface of the valve lifter 6 of the swing cam 7 moves to the cam nose portion side (lift portion side).
For this reason, when the drive cam 5 rotates and the one end 13a of the rocker arm 13 is pushed up through the link arm 14 when the intake valve 2 is opened, the valve lift amount of the intake valves 2 and 2 is increased through the valve lifter 6. Become.

  Next, a procedure for adjusting the valve lift of the intake valves 2 and 2 between the cylinders when assembling the respective components of the valve gear will be described.

  That is, after assembling each component such as the drive shaft 3 and the transmission mechanism 8 to the cylinder head 1 via the cam bearing, the cylinder head 1 is positioned in the minimum valve lift control state, and between the cylinders at the time of the minimum valve lift The lift amount of each intake valve 2 and 2 is checked.

  When checking the lift amount, first, a dummy adjusting shim 23 having a predetermined thickness is first fitted into the shaft portion 19 of the support member 17 through the insertion hole 23a, and then the shaft portion of the support member 17 is inserted. 19 is inserted into the support hole 16 and tightened after the nut 22 is screwed onto the male screw portion 19b of the tip portion 19a, whereby the adjustment shim 23 is sandwiched between the lower surface of the rocker arm other end portion 13b and the seating surface 18a. To do.

  Thereafter, when there is a deviation in the lift amount of the intake valves 2, 2 between the cylinders, the nut 22 is removed from the tip end portion 19 a and the shaft portion 19 is moved while the support member 17 is moved downward together with the link rod 15. It is extracted from the support hole 16 and then replaced with another adjusting shim 23 having a different thickness.

  Next, the shaft portion 19 is inserted again into the support hole 16, and the nut 22 is screwed onto the male screw portion 19 b of the tip end portion 19 a protruding from the upper end opening of the support hole 16 and tightened. As a result, the adjustment shim 23 is sandwiched between the lower surface of the other end 13b and the seating surface 18a, and the one end 15a of the link rod 15 is rotatably connected to the other end 13b. Adjustment work is completed.

  As a result, the length of the link rod 15 is substantially changed by the thickness change of the adjustment shim 23, and the lift amount of each intake valve 2, 2 can be adjusted to a desired optimum size. .

  As described above, in this embodiment, the nut 22 is screwed and fastened in the vertical direction or removed, and the support member 17 is moved in the vertical direction via the link rod 15, so that the adjustment shim 23 can be replaced. Since the minimum valve lift amount is adjusted, the lift adjustment work becomes extremely easy. Further, since the moment acting on the support member 17 from the swinging link rod 15 can be received by the seating surface 18a, the occurrence of breakage can be prevented even if the support member 17 has a thin shaft shape.

  In addition, since the adjusting mechanism is simply constituted by the support member 17 and the adjusting shim 23, the structure is simple, so that the manufacturing cost can be reduced.

  7 to 9 show a second embodiment. The basic configuration of the apparatus is the same as that of the first embodiment, but the structure of the adjusting mechanism is different.

  That is, a female screw portion 16a is formed on the inner peripheral surface of the support hole 16 formed in the other end portion 13b of the rocker arm 13, and a substantially cylindrical screw adjusting member 26 is screwed to the female screw portion 16a. The lower end edge of the screw adjusting member 26 is disposed in contact with the seating surface 18 a of the support member 17.

  More specifically, the screw adjusting member 26 has an axial length set shorter than the axial length of the support hole 16, and the shaft portion 19 of the support member 17 is inserted through the inner periphery thereof. A hole 26a is formed, and a male screw portion 26b that is screwed into the female screw portion 16a of the support hole 16 is formed on the outer peripheral surface.

  In addition, the screw adjusting member 26 has an engaging groove 26c as an engaging portion formed in the upper end edge along the diameter direction.

  Further, the screw adjusting member 26 has the engaging groove 26 c disposed inside the support hole 16, and the lower end edge 26 d slightly protrudes from the lower end opening edge of the support hole 16 to seat the support member 17. As shown in FIG. 9, the adjustment margin α is between the lower end edge 26 d and the lower end edge of the support hole 16 as shown in FIG. 9.

  Therefore, according to this embodiment, in order to adjust the minimum valve lift, first, the shaft portion of the support member 17 in a state in which the screw adjusting member 26 is screwed into the support hole 16 through the female screw portion 16a. 19 is inserted into the insertion hole 26 a of the screw adjusting member 26.

  Next, the nut 22 is screwed onto the shaft tip 19a, and the lower end edge 26d of the screw adjusting member 26 is brought into contact with the seating surface 18a to check the current minimum valve lift amount of each intake valve 2 and 2. To do.

  Here, when the valve lift amount varies between the cylinders, the nut 22 is removed again, and in this state, the tip of a predetermined driver as a jig is inserted from the upper end opening of the support hole 16 and the engagement is performed. The screw adjusting member 26 is turned in one direction by engaging with the mating groove 26c. Thereby, the screwing amount of the screw adjusting member 26 with respect to the support hole 16 is adjusted within the adjustment allowance α, and the length of the link rod 15 can be substantially changed.

  Thereafter, when the nut 22 is screwed to the shaft tip 19a of the support member 17 and tightened, the lower end edge 26d of the screw adjusting member 26 is pressed against the seating surface 18a, and one end of the link rod 15 is connected to the rocker arm other end 13b. The part 15a is rotatably connected.

  Thus, the intake valves 2 and 2 can be adjusted to a desired optimum lift amount.

  Thus, in the present embodiment, the minimum valve lift amount can be adjusted by adjusting the screwing amount of the screw adjusting member 26 from above the support hole 16 with a screwdriver. Therefore, the adjustment work is very easy. Become.

  In particular, since the operation of exchanging the adjustment shim 23 as in the first embodiment is not necessary, the valve lift adjustment operation is further simplified.

  Further, since the screw adjusting member 26 is disposed on the side of the engaging groove 26 a in the support hole 16, the presence of the screw adjusting member 26 does not make the height of the valve operating device larger than the length of the support hole 16. In addition, deterioration of in-vehicle performance can be prevented.

  Furthermore, since the engaging portion is constituted by a simple engaging groove 26a, it is not necessary to use a special jig, and the cost can be reduced.

  Also in this embodiment, as in the first embodiment, since the moment acting on the link rod 15 can be received by the seating surface 18a, breakage or the like may occur even if the support member 17 has a thin shaft shape. Can be prevented.

  Further, when adjusting the valve lift amount, the screwing amount of the screw adjusting member 26 can be changed while the shaft portion 19 of the support member 17 is inserted upward from the lower end opening of the support hole 16 in advance, and the nut 22 is attached to the distal end portion 19a. Since it is only screwed and tightened from above, lift adjustment and fixing work are also facilitated.

  10 to 12 show a third embodiment, in which the adjustment mechanism is constituted by a support member 17 and a second nut 27 that adjusts the length of the support member 17.

  That is, a second male screw portion 28 is formed on the outer peripheral surface of the base portion 18 side of the shaft portion 19 of the support member 17, and the second nut 27 is screwed to the second male screw portion 28. The lift adjustment is performed by changing the vertical position of the shaft portion 19 with respect to the support hole 16 according to the screwing position of the second nut 27 and the first nut 22.

  Therefore, in order to adjust the lift, first, the second nut 27 is screwed into the second male screw portion 28 of the shaft portion 19 of the support member 17 in advance and held at a predetermined position, and the shaft portion 19 is supported in this state. The first nut 23 is screwed onto the shaft tip 19a while being inserted through the insertion hole 16a of the hole 16, and the upper and lower surfaces of the other end 13b are clamped. In this state, the valve lift amounts of the intake valves 2 and 2 between the cylinders are checked.

  Here, when the valve lift amount varies between the cylinders, the first nut 22 is loosened and slightly moved upward, and the second nut 27 is swung in the direction toward the tip 19a accordingly. When the second nut 27 is turned slightly by a predetermined amount to the base 18 side and the first nut 22 is tightened, the axial position of the shaft portion 19 with respect to the support hole 16 is changed.

  Accordingly, the length of the link rod 15 is substantially changed, and the minimum valve lift amount of each intake valve 2 and 2 can be easily adjusted.

  In particular, in this embodiment, adjustment of the minimum valve lift amount and connection between the rocker arm other end portion 13b and the link rod one end portion 15a are performed using a double nut without removing the support member 17 from the rocker arm other end portion 13b. Since it can be performed simultaneously from the up and down direction, it is possible to greatly improve the work efficiency.

  The technical ideas other than the invention described in the claims, as grasped from the embodiment, will be described below.

  (1) An engagement portion with which a jig engages is formed at a position opposite to a direction in which the insertion member of the screw adjustment member is inserted into the penetration portion, and the engagement portion is placed in the penetration portion. The valve operating apparatus for an internal combustion engine according to claim 2, wherein the valve operating apparatus is arranged.

  At the time of lift adjustment, a screw adjusting member is screwed into the penetrating portion in advance, and the engaging portion is arranged in the penetrating portion. After that, if a jig such as a screwdriver is inserted from the opposite side to the insertion direction of the insertion member with respect to the penetration part and the tip part is engaged with the engagement part and rotated in one direction, fine adjustment of the lift can be easily performed. It becomes possible to do.

  And since the engaging part side which is one end side is arranged inside a penetration part, the height of a valve operating device does not become larger than the length of a penetration part by existence of a screw adjustment member, Deterioration of in-vehicle performance can be prevented.

  (2) The valve operating apparatus for an internal combustion engine according to (1), wherein the engaging portion is configured by an engaging groove formed at one end of the screw adjusting member.

  Since the engaging portion is constituted by a simple engaging groove, it is not necessary to use a special jig, and the cost can be reduced.

  (3) The fixing means includes a male screw portion formed on an outer periphery of the insertion member and a nut meshing with the male screw portion, and the other end of the rocker arm and the adjusting mechanism are provided between the step portion and the nut. The valve operating device for an internal combustion engine according to claim 2 or 3, wherein the valve operating device is sandwiched between the two.

  At the time of lift adjustment, for example, the insertion member is inserted in advance from the lower direction of the rocker arm through the lower part, and the nut is screwed from the upper part to the tip of the insertion member protruding from the through part and tightened. Since the work is also relatively easy, the lift adjustment work is simple.

(4) A drive shaft that is rotationally driven by the crankshaft of the engine and has a drive cam integrally fixed to the outer periphery;
A link arm that rotatably supports the drive cam;
A rocker arm supported by a control shaft via a control cam so as to be swingable, one end side of which is rotatably linked to the link arm, and a penetrating portion formed along the swinging direction at the other end side;
An insertion member that swings integrally with the rocker arm in a state of being inserted into the penetrating portion;
A link rod having one end side pivotably connected to the insertion member;
A swing cam linked to the other end of the link rod so as to be swingable and opening / closing the engine valve by a swing motion transmitted from the rocker arm via the link rod;
An adjustment mechanism for adjusting the position of the insertion member in the insertion direction with respect to the penetrating portion;
A fixing means for fixing the insertion member from the opposite side to the insertion direction of the insertion member when the insertion member is inserted into the penetration portion and fixed to the rocker arm;
A valve operating apparatus for an internal combustion engine, comprising:

  The present invention is not limited to the configuration of the above-described embodiment. For example, the variable mechanism that makes the valve lift variable may have another structure, and the drive cam may have, for example, a raindrop structure. . In addition to the intake valve side, this valve operating device can be applied to the exhaust valve side or both valve sides.

It is a disassembled perspective view of the rocker arm other end part and adjustment mechanism which are provided for 1st Embodiment of this invention. It is a side view of the rocker arm and adjustment mechanism which are provided to this embodiment. It is the sectional view on the AA line of FIG. It is a top view of the rocker arm and an adjustment mechanism. It is a principal part perspective view of the valve gear in this embodiment. It is a principal part top view of the valve gear in this embodiment. It is a disassembled perspective view of the rocker arm other end part and adjustment mechanism which are provided to 2nd Embodiment. It is a side view of the rocker arm and adjustment mechanism which are provided to this embodiment. It is the BB sectional drawing of FIG. It is a disassembled perspective view of the rocker arm other end part and adjustment mechanism which are provided to 3rd Embodiment. It is a side view of the rocker arm and adjustment mechanism which are provided to this embodiment. It is CC sectional view taken on the line of FIG.

Explanation of symbols

2 ... Intake valve (engine valve)
DESCRIPTION OF SYMBOLS 3 ... Drive shaft 4 ... Cam shaft 5 ... Drive cam 7 ... Swing cam 13 ... Rocker arm 13b ... Other end 15 ... Link rod 15a * 15b ... Both ends 16 ... Support hole (penetration part)
16a ... Female thread portion 17 ... Support member (adjustment mechanism)
18 ... Base 18a ... Seating surface (step)
DESCRIPTION OF SYMBOLS 19 ... Shaft part 19a ... Tip part 19b ... Male thread part 22 ... Nut (fixing means)
23 ... Adjustment shim (Adjustment mechanism)
26 ... Screw adjustment member (adjustment mechanism)
26b ... male screw part 27 ... second nut

Claims (3)

A drive shaft that is rotationally driven by the crankshaft of the engine, and a drive cam integrally fixed to the outer periphery;
Rotating force is supported by one end, and the rotational force transmitted from the drive cam on one end side is converted into a swinging motion and transmitted to the other end side, and a penetrating portion is formed on the other end side along the swinging direction. Rocker arm,
A link rod whose one end is linked to the other end of the rocker arm;
An insertion member that swings integrally with the rocker arm in a state in which a base portion is slidably connected to the other end side of the link rod and a distal end portion having a male screw portion formed on the outer periphery is inserted into the through-hole portion;
A swing cam that opens and closes the engine valve by a swing motion transmitted from the rocker arm via the insertion member and the link rod;
An adjustment mechanism for adjusting the position of the insertion member in the insertion direction with respect to the penetrating portion;
When fixing the other end of the rocker arm via the external thread portion of the distal end portion projecting from the upper end opening of the through portion is inserted into the through portion of the insertion member, the insertion direction with respect to the penetrating portion of the insertion member Fixing means for screwing onto the male screw portion from the opposite side;
A valve operating apparatus for an internal combustion engine, comprising: The adjustment mechanism includes a stepped portion provided on the insertion member so as to protrude in the radial direction, and an adjustment shim sandwiched between the stepped portion and the rocker arm via the fixing means. The valve operating apparatus for an internal combustion engine according to claim 1. The adjustment mechanism includes a stepped portion provided on the insertion member so as to protrude in the radial direction, and a screw that is fitted into the insertion member, is abutted and locked to the stepped portion, and has a male screw portion formed on the outer periphery. 2. The valve operating apparatus for an internal combustion engine according to claim 1, comprising: an adjustment member; and an internal thread portion that is formed on an inner periphery of the through portion and is screwed into an external thread portion of the screw adjustment member.

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