JP3832298B2 - Engine valve gear - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a valve operating apparatus for an engine, and more particularly to a direct type valve operating apparatus that directly drives a valve with a cam via a tappet.
[0002]
[Prior art]
In a direct type valve operating device that directly drives the intake valve and exhaust valve of an engine for automobiles via a tappet with a cam, a split tappet type variable lift mechanism is configured, and hydraulically operated at high speed operation and low speed operation. 2. Description of the Related Art Conventionally, it is known that the operation of a variable valve lift mechanism can be switched to change the operating lift characteristics of a valve between a large lift state and a small lift state, or between a lift state and a non-lift state. And, in order to supply the hydraulic pressure to the lift variable mechanism from the oil passage on the cylinder head side through the oil passage on the tappet side, it is necessary to prevent the cylindrical tappet from rotating with respect to the cylinder head. For example, as described in German Patent Application Publication No. 19721208A1, a rotation pin, a ball, or the like is disposed between the outer periphery of the tappet and the cylinder head.
[0003]
[Problems to be solved by the invention]
However, in the conventional rotation structure in which pins, balls, etc. are arranged between the outer periphery of the tappet and the cylinder head, it is necessary to separately process a holding portion for holding the pins, balls, etc. in the tappet body. The structure becomes complicated.
[0004]
SUMMARY OF THE INVENTION An object of the present invention is to provide a valve operating device for an engine having a tappet provided with a split tappet type variable lift mechanism so that the rotation of the tappet can be achieved with a simple and easy processing configuration.
[0005]
[Means for Solving the Problems]
A valve operating apparatus for an engine according to the present invention is provided with a cylindrical tappet that abuts against a cam and slides in a tappet guide hole of a cylinder head side member in a valve opening / closing direction to lift the valve. The center tappet and the side tappet on both sides in the cam axial direction are divided so that the center tappet and the side tappet can be moved relative to each other in the tappet sliding direction, and can be connected to and disconnected from each other by the locking means. As the two types of cams having different cam profiles, the center tappet is arranged so as to abut against one cam and the side tappet is brought into contact with the other cam. A through hole extending to the center, and slidingly fitted in the through hole, and driven by hydraulic pressure to couple the center tappet and the side tappet The lock pin is configured to restrict relative movement in the pet sliding direction, and a spring that urges the lock pin to a position where the center tappet and the side tappet are separated from each other and can be relatively moved in the tappet sliding direction. In the valve operating device of the engine, in which the valve drive characteristics can be changed by connecting / disconnecting the center tappet and the side tappet by means, a stopper portion for restricting movement of the lock pin in the connecting direction is provided at one end of the through hole of the tappet. The bush provided is fitted and fixed, a groove extending in the tappet sliding direction is provided on the inner periphery of the tappet guide hole, and the end of the tappet outer peripheral side of the bush that is fitted and fixed to one end of the through hole of the tappet, The tappet stop member is configured to support the tappet rotation member so as to regulate the rotation of the tappet in cooperation with the groove on the inner periphery of the tappet guide hole.
[0006]
In this case, a valve operating device is configured that can change the driving characteristics of the valve by switching the locking means by hydraulic pressure with a split tappet type, and is fitted to one end of the through hole of the tappet to restrict movement of the lock pin of the locking means. With the configuration using the bush to be fixed together, the through hole remains a simple hole, and the rotation stopping member can be reliably held. Therefore, it is not necessary to separately process the tappet main body for holding the locking member, and the tappet structure is simple and processing is easy.
[0007]
In this valve operating apparatus, for example, the cam is divided into two types, a high speed cam having a cam profile with a large lift amount and a low speed cam having a cam profile with a small lift amount. The side tappet is placed in contact with the low speed cam, and the valve is switched between the low speed cam driving mode and the high speed cam driving mode by connecting / disconnecting the center tappet and the side tappet by the locking means. Good.
[0008]
In addition, the bush has a partition wall as the stopper portion at the center in the axial direction, has a fitting hole for fitting a lock pin at one end across the partition wall, and a rotation member at the other end portion. It is preferable to have a fitting hole to be fitted, and to have a through hole that communicates both fitting holes with the partition wall, so that the through hole of the partition wall acts as a breath hole and the movement of the lock pin is smooth It becomes. Moreover, the process is easy.
[0009]
Further, in this valve operating apparatus, the tappet stop member is preferably spherical, and the spherical tappet stop member is fitted into the bush for the stop member fitting by a holding member having a bent claw portion. It is preferable to have a configuration in which the hole is held. In this case, the tappet stop member can be held only by bending the bent claw portion of the holding member, and assembly can be performed with a simple operation.
[0010]
Further, in this valve operating apparatus, the tappet is configured so that the center tappet is substantially rectangular long in the cam sliding contact direction when viewed from the cam side and the side tappets are arranged on both sides of the tappet so as to be generally circular. Then, a hydraulic plunger is slidably fitted into a through-hole portion that penetrates one side tappet of the through-hole extending through the center tappet and the side tappet and extending in the camshaft direction, and an operating hydraulic chamber is provided at the back of the hydraulic plunger. In addition, an oil passage for supplying hydraulic oil to the hydraulic hydraulic chamber is formed in the one side tappet, and the lock pin is disposed in a portion of the through hole that penetrates the center tappet so as to be driven by the hydraulic plunger. The bush and the rotation-stopping member may be attached to a portion of the through-hole penetrating the other side tappet so that the divided tappet can be easily Locking means capable of coupling and separating by formation is obtained.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0012]
1 to 3 show a structure of a tappet and a tappet guide hole portion in an engine valve operating apparatus according to an example of an embodiment of the present invention. This example is a DOHC (double overhead cam) in-line multi-cylinder engine, and includes a direct type valve operating device that directly drives an intake valve and an exhaust valve via a tappet, and the valve operating device is A lift variable means capable of changing the valve lift between high speed operation and low speed operation is provided.
[0013]
A tappet guide portion 27 constituting a cylindrical tappet guide hole 25 is provided in the cam carrier 11 at the upper part of the cylinder head of the engine, and the tappet 50 is driven in the tappet guide hole 25 by cams 70a, 70b and 70c. Thus, the intake valve and the exhaust valve are slidably received so as to reciprocate. In the case of an engine having no cam carrier, the tappet guide portion 25 is provided on the cylinder head body.
[0014]
The tappet 50 is generally cylindrical and has a center tappet 51 that constitutes a substantially rectangular flat center cam contact surface that is long in the cam sliding contact direction, and is disposed on both sides of the cam contact surface of the center tappet 51. 51 is divided into a side tappet 52 that constitutes a side cam abutting surface having a substantially circular plane shape together with the center cam abutting surface 51, and the center tappet 51 and the side tappet 52 are relatively movable in the tappet sliding direction. In addition, they can be connected to and disconnected from each other by a lock mechanism described later.
[0015]
The side tappet 52 has a structure in which a pair of left and right cylindrical portions 52a and 52b having side cam contact surfaces are integrally connected by a lower connection portion 52c that forms a contact portion with a stem end of a valve. A tappet spring 53 is installed on the portion 52c, and the center tappet 51 is assembled between the left and right cylindrical portions 52a and 52b from above. In the tappet 50, the lower surface of the lower connecting portion 52c comes into contact with the stem ends of the intake valve and the exhaust valve through a shim (not shown).
[0016]
The center tappet 51 is parallel to the cam sliding contact direction and the tappet sliding direction extending vertically downward from both long side edges along the cam sliding contact direction of the substantially rectangular flat center cam contact surface, and is centered on the tappet axis. A pair of side end faces 54a, 54b symmetrical to each other, and a pair of outer circular arcs parallel to the tappet sliding direction extending vertically downward from the edges on both short sides and symmetrical with respect to the tappet axis. It has circumferential surfaces 55a and 55b.
[0017]
The center tappet 51 is formed with a through-hole 56 penetrating from one side end surface to the other side end surface in parallel to the cam shaft direction and concentrically with the tappet axis.
[0018]
Further, the center tappet 51 has both outer circumferential surfaces 55a and 55b at both edges in the circumferential direction, and the outer side continuously projects from the outer circumferential surfaces 55a and 55b to the side tappet 52 side, Overhang portions 57a to 57d that constitute a sliding contact surface with the side tappet 52 are formed over substantially the entire length in the tappet shaft direction so that the inner side projects from the side end surfaces 54a and 54b at a substantially right angle in the cam shaft direction. ing.
[0019]
The side tappet 52 is parallel to the cam sliding contact direction and the tappet sliding direction extending vertically downward from the inner edge facing the cam sliding contact direction of the side cam contact surfaces of the pair of left and right cylindrical portions 52a and 52b. The inner end faces 58a and 58b that are symmetrical with respect to the tappet axis are provided at the opposite ends of the inner end faces 58a and 58b in the cam sliding contact direction with a predetermined distance from the side end faces 54a and 54b of the center tappet 51. It has protrusions 59a to 59d that face each other in a non-sliding contact state, and is parallel to the tappet sliding direction extending vertically downward from the edge on the cam shaft outer end side of the side cam contact surface and symmetrical with respect to the tappet axis. The outer peripheral surfaces 60a and 60b have a circular arc shape.
[0020]
The cylindrical portions 52a and 52b of the side tappet 52 have through-holes 61a and 61b penetrating from the inner end surfaces 58a and 58b to the outer peripheral surfaces 60a and 60b in parallel to the cam shaft direction and concentrically with the tappet axis. However, when the center cam sliding contact surface of the center tappet 51 and the side cam sliding contact surface of the side tappet 52 are flush with each other, the center tappet 51 is formed to communicate with the through hole 56 of the center tappet 51 in a straight line without any step.
[0021]
Further, the protruding portion 57a formed on the edge of the center tappet 51 in the cam sliding contact direction is formed at the end of the inner end surfaces 58a and 58b of the cylindrical portions 52a and 52b of the side tappet 52 in the cam sliding contact direction. Sliding contact portions 62a to 62d that are in sliding contact with the sliding contact surfaces of .about.57d are formed in a rib shape over substantially the entire length in the tappet axial direction.
[0022]
The center tappet 51 and the side tappet 52 include side end faces 54a and 54b of the center tappet 51, and protrusions 59a to 59d positioned at both ends of the inner end faces 58a and 58b of the cylindrical portions 52a and 52b of the side tappet 52, respectively. Are opposed to each other in a non-sliding state at a predetermined interval, and the projecting portions 57a to 57d of the center tappet 51 and the sliding contact portions 62a to 62d of the cylindrical portions 52a and 52b of the side tappet 52 are freely slidable. is there.
[0023]
The camshaft 7 is located between each of the two side cams 70a and 70b (low speed cams) having the same cam profile with a low lift amount for each tappet 50 and between the two side cams 70a and 70b. One high-speed center cam 70c (high-speed cam) having an amount of cam profile is provided.
[0024]
In the center tappet 51 and the side tappet 52, the center cam sliding contact surface of the center tappet 51 contacts the base circle portion of the center cam 70c, and the side cam sliding contact surface of the side tappet 52 contacts the base circle portions of the side cams 7oa and 70b. In this state, the center cam sliding contact surface of the center tappet 51 and the side cam sliding contact surface of the side tappet 52 are substantially flush with each other, and in this state, the through hole 56 of the center tappet 51 and the through holes 61a and 61b of the side tappet 52 are in a straight line. Communicate with.
[0025]
In the side tappet 52, the outer peripheral surfaces 60a and 60b substantially abut on the inner peripheral surface of the tappet guide hole 25 in the cam shaft direction. A predetermined gap is maintained between the projecting portions 59 a to 59 d of the side tappet 52 and the center tappet 51, and the side tappet 52 and the center tappet 51 of the tappet 50 are inside the tappet guide holes 25 and 26 by this gap. The machining error is acceptable.
[0026]
In the tappet 50, the through hole 56 (through hole portion) of the center tappet 51 and the through holes 61a and 61b (through hole portions) of the side tappet 52 are such that the center cam sliding contact surface of the center tappet 51 is the base of the center cam 70c. In contact with the circle portion, the side cam sliding contact surface of the side tappet 52 is in contact with the base circle portion of the side cams 70a and 70b, and communicates in a straight line in the cam shaft direction to form a series of through holes. The through hole can project into a through hole portion (through hole 61b) penetrating one cylindrical portion 52b of the side tappet 52 and into a through hole portion (through hole 56) penetrating the center tappet 51 by hydraulic pressure. A hydraulic plunger 71 is built in, and a through-hole portion (through-hole 56) that penetrates the center tappet 51 is penetrated into the other tubular portion 52a of the side tappet 52 by hydraulic pressure via the hydraulic plunger 71 ( A lock pin 72 is built in so as to be able to protrude into the through hole 61a), and the lock pin 72 is urged to a position where the center tappet 51 and the side tappet 52 are separated from each other and can be relatively moved in the tappet sliding direction. A pressing spring 73 is incorporated.
[0027]
The through holes 56, 61a, 61b, the hydraulic plunger 71, the lock pin 72, the pressing spring 73, and the like constitute a locking means that allows the center tappet 51 and the side tappet 52 to be coupled to and detached from each other.
[0028]
In the through hole portion (through hole 56) on the center tappet 51 side, bushes 74 and 75 are provided at both ends of the divided portion with the side tappet 52 so as to be flush with the side end surfaces 54a and 54b of the center tappet 51, respectively. Insertion is fixed. Among them, the bush 75 fixed to the end portion on the hydraulic plunger 71 side abuts on the flange 76 on the outer periphery of the lock pin 72 and restricts the movement of the lock pin 72 to the hydraulic plunger 71 side. The bush 74 fixed to the other end holds the pressing spring 73 in a compressed state between the bush 74 and the flange 76 on the outer periphery of the lock pin 72.
[0029]
Further, bushes 77 and 78 are respectively inserted and fixed in the through hole portions (through holes 61a and 61b) on the side tappet 52 side. Among them, the bush 78 inserted and fixed in the through hole portion (through hole 61b) of the cylindrical portion 52b in which the hydraulic plunger 71 is built is closed on the outer peripheral side of the tappet by the end wall 78a, and the hydraulic plunger 71 on the inner side. Has a fitting hole 78b for sliding fitting.
[0030]
Further, the bush 77 inserted and fixed in the through hole portion (through hole 61a) of the other cylindrical portion 52a has a partition wall 77a as a stopper portion for restricting the movement of the lock pin 72 at the center in the axial direction. It has a fitting hole 77b for fitting the end of the lock pin 72 on the inner side across the partition wall 77a, and has a fitting hole 77c for fitting a rotation stop member described later on the outer side of the tappet, The partition wall 77a has a through hole 77d that communicates both the fitting holes 77b and 77c.
[0031]
The bushes 77 and 78 on the side tappet 52 side project the end portion on the center tappet 51 side by a predetermined dimension from the through hole portions (through holes 61a and 61b), and the through hole portion (through hole 56) of the center tappet 51. The end faces of the bushes 74 and 75 inserted and fixed to each other are opposed to each other at a predetermined interval.
[0032]
In the lock means having such a configuration, when hydraulic pressure is applied, the hydraulic plunger 71 moves to the lock pin 72 side, the end portion enters the through hole portion (through hole 56) on the center tappet 51 side, and the lock pin 72 is The end of the lock pin 72 is inserted into the through hole portion (the through hole 61a) of the side tappet 52 by moving it against the pressing spring 73. At this time, the hydraulic plunger 71 straddles a divided portion between the center tappet 51 and one cylindrical portion 52 b of the side tappet 52, and the lock pin 72 extends between the center tappet 51 and the other cylindrical portion 52 a of the side tappet 52. And the center tappet 51 and the side tappet 52 are coupled to each other to be in a locked state. When the hydraulic pressure is released, the pressing spring 73 moves the lock pin 72 toward the hydraulic plunger 71, the hydraulic plunger 71 returns to the original position, and both end surfaces of the lock pin 72 are the through holes of the center tappet 51. In 56, the center tappet 51 and the side tappet 52 are flush with the divided portion, and the center tappet 51 is detached from the side tappet 52 and unlocked (unlocked).
[0033]
In this way, the locking means can be switched between a locked state and an unlocked state by hydraulic pressure. In the locked state, the side tappet 52 and the center tappet 51 are coupled, and the center tappet 51 driven by the side tappet 52 and the center cam 70c. Cooperate with each other to lift the intake valve and the exhaust valve in a high-speed manner, and in the unlocked state, the center tappet 51 separates from the side tappet 52 and slides relatively, and is driven by the side cams 70a and 70b. The intake and exhaust valves are lifted in a low speed manner.
[0034]
In the tappet 50, oil passages 81 and 82 each having three processing holes are provided so as to supply the hydraulic pressure to the lock mechanism to a cylindrical portion 52a having a through hole 61b in which the hydraulic plunger 71 of the side tappet 52 is incorporated. , 83 are provided. The first oil passage 81 is formed by a processing hole drilled from the opposite side of the side tappet 52, and extends in the tappet sliding direction at a position offset from the center surface in the cam shaft direction. The second oil passage 82 is formed by a processing hole that is vertically drilled from the outer peripheral surface of the side tappet 52 toward the first oil passage 81, and the first oil passage 81 is provided in the cam carrier 11 to be described later. It is possible to communicate with the hydraulic oil supply passage 93. Further, the third oil passage 83 is constituted by a processing hole that is drilled from the tappet outer peripheral side opening of the through hole 61 b of the side tappet 52 toward the cam side end of the processing hole that constitutes the first oil passage 81. Then, the tappet outer peripheral side end portion of the through hole 61 b serving as the working hydraulic chamber behind the hydraulic plunger 71 is communicated with the first oil passage 81.
[0035]
One cylindrical portion 52b of the side tappet 52 has an opening in the bush 78 that is inserted and fixed in the through hole 61b that houses the hydraulic plunger 71 so that the third oil passage 83 communicates with the working hydraulic chamber at the back of the hydraulic plunger 71. 84 is formed.
[0036]
Further, the tappet 50 has a spherical member 86 as a tappet stop member in the fitting hole 77c on the outer periphery side of the tappet of the bush 77 fixed to the through hole 61a of the cylindrical portion 52a that does not incorporate the hydraulic plunger 71. It is held so as to be able to roll while partially protruding from the outer periphery of the tappet. The spherical member 86 includes a ring-shaped holding member 87 having a bent claw portion 87 a inserted from the outside along the inner periphery of the through hole 61 a, and a reduced diameter portion provided on the outer surface of the end portion of the bush 77. By being fitted and fixed in between, it can be held freely rolling.
[0037]
A spherical member 86 as a tappet stop member held on the tappet 50 side is engaged with the inner periphery of the tappet guide hole 25 provided in the cam carrier 11 so that the tappet guide hole 25 can move only in the tappet sliding direction. A groove 88 extending in the tappet sliding direction is provided. The spherical member 86 regulates the rotation of the tappet 50 in cooperation with the groove 88 on the inner periphery of the tappet guide hole 25.
[0038]
Further, the side end faces 54a and 54b facing the cylindrical portions 52a and 52b of the side tappet 52 of the center tappet 51 are formed in the cylindrical portions 52a and 52b of the side tappet 52 in the cam shaft direction below the through hole 56. Locking portions 89a and 89b protruding toward the end faces 58a and 58b and locked to the ends of bushes 77 and 78 protruding inward from the through holes 61a and 61b of the cylindrical portions 52a and 52b of the side tappet 52. Is formed. When these locking portions 89a and 89b are locked to the bushes 77 and 78 on the side tappet 52 side on both sides, the center tappet 51 is restricted from moving upward in the tappet sliding direction.
[0039]
The cam carrier 11 is provided with an oil gallery 91 extending in the cylinder head longitudinal direction (cam shaft direction) in the vicinity of the tappet guide hole portion 27 of each cylinder, and the oil pressure from the oil gallery 91 is lifted by the lift of each tappet 50. A hydraulic oil supply passage 93 that branches from the oil gallery 91 and opens to the inner peripheral surface of the tappet guide hole 25 is provided so as to be supplied to the variable mechanism.
[0040]
The hydraulic oil supply passage 93 is formed by a processing hole formed by drilling or the like from the side end surface of the cam carrier 11, and the oil is supplied at a position offset from the tappet guide hole 25 by a predetermined amount in the column direction from the center of the cylinder column direction. It opens to the gallery 91 and opens at a position offset from the center surface in the cam shaft direction with respect to the inner peripheral surface of the tappet guide hole 25.
[0041]
The opening of the hydraulic oil supply passage 93 in the inner peripheral surface of the tappet guide hole 25 is in a state in which the side cam sliding contact surface of the side tappet 52 is in contact with the base circle portion of the side cams 70a and 7ob. It communicates with the second oil passage 82 provided in the cylindrical portion 52b.
[0042]
The hydraulic pressure for operating the hydraulic plunger 71 of the locking means of the tappet 50 is controlled by a hydraulic control valve (not shown), and is supplied to the operating hydraulic chamber through the hydraulic supply passage 93 at a high speed when the locking means of the tappet 50 is locked. Is done. At that time, the hydraulic pressure from the oil pump (hydraulic power source) is guided to the oil gallery 91 via the hydraulic control valve, and the side cam sliding contact surface of the side tappet 52 comes into contact with the base circle portions of the side cams 70a and 70b to supply hydraulic oil. The opening in the inner peripheral surface of the tappet guide hole 25 of the passage 93 is in communication with the second oil passage 82 of the side tappet 25 and is introduced into the second oil passage 82 via the hydraulic oil supply passage 93, The oil passage 82 is introduced into the through hole 61b through the first oil passage 81 and the third oil passage 83, and is supplied to the working hydraulic chamber behind the hydraulic plunger 71.
[0043]
【The invention's effect】
As is apparent from the above description, according to the present invention, in the valve gear for an engine having a tappet having a split tappet type variable lift mechanism, the rotation of the tappet can be achieved with a simple and easy processing configuration.
[Brief description of the drawings]
FIG. 1 is a partial cross-sectional view in plan view of a tappet and a tappet guide hole portion in an example of an embodiment of the present invention.
FIG. 2 is a longitudinal sectional view in the cam shaft direction of a tappet and a tappet guide hole portion in an example of an embodiment of the present invention.
FIG. 3 is a partial longitudinal sectional view perpendicular to the cam shaft direction of a tappet and a tappet guide hole portion in an example of an embodiment of the present invention.
[Explanation of symbols]
11 Cam carrier 25 Tappet guide hole 27 Tappet guide part 50 Tappet 51 Center tappet 52 Side tappet 56 Through hole 61a, 61b Through hole 70a, 70b Side cam 70c Center cam 71 Hydraulic plunger 72 Lock pin 73 Press spring 74, 75 , 77, 78 Bush 77a Bulkhead 77b, 77c Fitting portion 77d Through hole 81 First oil passage 82 Second oil passage 83 Third oil passage 86 Spherical member 87 Holding member 87a Bending claw portion 88 Groove 91, 92 Oil gallery 93, 94 Hydraulic oil supply aisle

Claims (5)

Provided with a cylindrical tappet that contacts the cam and slides in the tappet guide hole of the cylinder head side member in the valve opening and closing direction to lift the valve,
The tappet is divided into a center tappet at the center in the camshaft direction and side tappets at both sides in the camshaft direction so that the center tappet and the side tappet can move relative to each other in the tappet sliding direction, and can be It can be combined and detached,
The cam is arranged as two types of cams having different cam profiles such that the center tappet is in contact with one cam and the side tappet is in contact with the other cam,
The locking means includes a through hole that extends through the center tappet and the side tappet and extends in the cam shaft direction, and is slidably fitted into the through hole, and is driven by hydraulic pressure to couple the center tappet and the side tappet. The lock pin for restricting the relative movement in the tappet sliding direction and the spring for urging the lock pin to a position where the center tappet and the side tappet are separated from each other and can be relatively moved in the tappet sliding direction. ,
In the valve operating apparatus of the engine, the driving characteristic of the valve can be changed by coupling / disengaging the center tappet and the side tappet by the locking means.
Fitting and fixing a bush provided with a stopper portion that restricts movement of the lock pin in the coupling direction at one end of the through hole of the tappet,
A groove extending in the tappet sliding direction is provided on the inner periphery of the tappet guide hole,
A tappet detent member is provided at the end of the outer periphery of the tappet that is fitted and fixed to one end of the through hole of the tappet so as to regulate the rotation of the tappet in cooperation with the groove on the inner periphery of the tappet guide hole. A valve operating apparatus for an engine characterized by being configured to support. There are two types of cams: a high speed cam having a large lift cam profile and a low speed cam having a small lift cam profile. Place the side tappet so that it abuts,
2. The valve operating apparatus for an engine according to claim 1, wherein the valve is switched between a low-speed cam drive mode and a high-speed cam drive mode by connecting / disconnecting a center tappet and a side tappet by the locking means. The bush has a partition wall as the stopper portion in the axial center portion, has a fitting hole for fitting the lock pin at one end portion with the partition wall interposed therebetween, and the rotation member at the other end portion. The valve operating apparatus for an engine according to claim 1, further comprising a fitting hole that is fitted, and a through hole that communicates the fitting holes with the partition wall. The said tappet stop member is made into a spherical shape, The spherical tappet stop member is configured to be held in the fitting hole for fitting the stop member of the bush by a holding member having a bent claw portion. Engine valve gear. The tappet is configured so that the center tappet is substantially rectangular long in the cam sliding contact direction when viewed from the cam side in the tappet axial direction, and side tappets are arranged on both sides of the center tappet so as to be generally circular.
A hydraulic plunger is slidably fitted into a through-hole portion that penetrates one side tappet of the through-hole extending through the center tappet and the side tappet and extending in the cam shaft direction, and an operating hydraulic chamber is formed on the back surface of the hydraulic plunger. And forming an oil passage in the one side tappet for supplying hydraulic oil to the hydraulic pressure chamber,
The lock pin is disposed in a portion that penetrates the center tappet of the through hole so as to be driven by the hydraulic plunger,
The valve operating device for an engine according to claim 3, wherein the bush and the rotation-stopping member are attached to a portion that penetrates the other side tappet of the through hole.

Images