JP6714478B2 - Variable valve mechanism for internal combustion engine - Google Patents

Description

TECHNICAL FIELD The present invention relates to a variable valve mechanism that drives a valve of an internal combustion engine and changes the drive state of the valve according to the operating condition of the internal combustion engine.

The valve mechanism of Patent Document 1 includes an adjusting screw for adjusting the valve clearance on the rocking fulcrum of the rocker arm.

The variable valve mechanism of Patent Documents 2 and 3 includes a rocker arm including a first arm and a second arm. Then, the drive state of the valve is switched by connecting or disconnecting the first arm and the second arm with the switching pin.

JP, 2010-59926, A International Publication No. 2008/068629 International Publication No. 2008/068306

When attempting to adopt the switching device of the cited document 2 or 3 in Patent Document 1, there are the following problems. That is, the switching device of Patent Document 2 requires the shaft on the swing fulcrum. Further, the switching device of Patent Document 3 requires a linear movement type switching pin on the swing fulcrum. However, since the rocker arm of Patent Document 1 has the adjusting screw on the swing fulcrum, it is difficult to install the shaft or the linear movement type switching pin at this position. Therefore, it is difficult to mount the switching device of the cited documents 2 and 3 on the rocker arm of the cited document 1.

Therefore, it is an object of the present invention to enable a switching device to be mounted on a valve operating mechanism even when a linear movement type switching pin cannot be installed at a desired position in a rocker arm due to an adjustment screw or the like. ..

In order to achieve the above object, the variable valve mechanism of the internal combustion engine of the present invention is configured as follows. The variable valve mechanism includes a first arm and a second arm, and a rocker arm that is driven by a cam to swing to drive a valve, a connected state in which the first arm and the second arm are connected, and the connection is released. It is configured to include a switching device that switches the drive state of the valve by switching to the unconnected state.

And it has the following features. The switching device includes a rotating member that includes a base portion that is attached to the first arm so as to be rotatable about a predetermined axis, and an engaging portion that projects from the base portion in a direction that intersects with the axis, and the rotating member. By rotating the rotating member in the one engaging direction around the axis and engaging the engaging portion with the second arm, the connection state is switched, and the rotating member is rotated in the other releasing direction around the axis. The rotation device is configured to switch to the non-connected state by causing the engagement to be released.
In addition, the feature <a>, <a>, <c> or <d> described later is featured.

The form of the rotating device is not particularly limited, and for example, the rotating member may be rotated in the engaging direction and the releasing direction by a hydraulic device and a return spring provided in one arm. The following mode is preferable in that the arm is light. That is,
<A> The rotating member includes an abutted portion protruding from the base portion in a direction intersecting the axis. The rotating device is for rotating the control shaft provided outside the rocker arm and the rotating member protruding from the control shaft and abutting against the contacted portion from one side in the longitudinal direction of the control shaft in the releasing direction. A release contact piece, an engagement contact piece that protrudes from the control shaft and contacts the contacted portion from the other side in the length direction of the control shaft, and that rotates the rotating member in the engagement direction; And an actuator for displacing the shaft in its lengthwise direction.

Even when the conventional linear movement type switching pin cannot be installed at a desired position in the rocker arm, by adopting the configuration of the present invention (installing the rotating member), the switching device can be mounted on the valve mechanism. ..

3 is a perspective view showing a variable valve mechanism of Embodiment 1. FIG. In the variable valve mechanism, (a) is a plan view showing a rocker arm and a switching device, and (b) is a side view. In the variable valve mechanism, (a) is a plan view showing a case where the release contact piece is bent by displacing the control shaft to the other side in the longitudinal direction, and (b) is a plan view of the release contact piece thereafter. A plan view showing a time when the rotating member is rotated in a releasing direction by an elastic force, (c) is a plan view showing a time when the engaging abutment piece is bent by displacing the control shaft in one of its lengthwise directions, FIG. 6D is a plan view showing a case where the rotating member is subsequently rotated in the engaging direction by the elastic force of the engaging contact piece. In the variable valve mechanism, it is a side sectional view showing a nose state in a non-connected state (low lift drive state). In the variable valve mechanism, it is a side sectional view showing a nose state in a connected state (high lift drive state). FIG. 7 is a perspective view showing a variable valve mechanism according to a second embodiment. In the variable valve mechanism, (a) is a plan view showing a rocker arm and a switching device, and (b) is a side view. In the variable valve mechanism, (a) is a plan view showing a case where the release contact piece is bent by displacing the control shaft to the other side in the longitudinal direction, and (b) is a plan view of the release contact piece thereafter. A plan view showing a time when the rotating member is rotated in a releasing direction by an elastic force, (c) is a plan view showing a time when the engaging abutment piece is bent by displacing the control shaft in one of its lengthwise directions, FIG. 6D is a plan view showing a case where the rotating member is subsequently rotated in the engaging direction by the elastic force of the engaging contact piece. In the variable valve mechanism, it is a side sectional view showing a nose state in a non-connected state (low lift drive state). In the variable valve mechanism, it is a side sectional view showing a nose state in a connected state (high lift drive state).

The mode of the releasing contact piece and the engaging contact piece is not particularly limited, and may be, for example, one having no flexibility, but the rotating member can be smoothly rotated when the base circle. It is preferable that each of them is configured as follows.

The release contact piece has flexibility. Then, when the control shaft is displaced during the nose of the cam nose when switching from the connected state to the non-connected state, the engaging portion continues to frictionally engage the second arm and the release contact is made. The bending of the piece holds the rotation of the rotating member, and when the base circle after the nose, the elastic force of the bent releasing contact piece causes the rotating member to rotate in the releasing direction.

The engaging contact piece has flexibility. When the control shaft is displaced during the nose of the cam nose when switching from the non-connected state to the connected state, the engaging portion abuts the side surface of the second arm and the engaging abutting piece is By the bending, the rotation of the rotating member is retained, and when the base circle after the nose, the rotating member is rotated in the engaging direction by the elastic force of the bent engaging contact piece.

The attachment of the rotating member to the first arm is not particularly limited, and for example, an arbitrary shaft member is attached to the first arm, and the rotating member is rotatably fitted on the shaft member. However, it is possible to mount the switching device on the adjuster screw without significantly changing the structure of the conventional rocker arm (for example, Patent Document 1) by using the adjuster screw. Preferably.

Specifically, the following modes will be exemplified. That is,
<B> attached at the base of the pivot member relative to the first arm, the first arm, screwing length direction intermediate portion of the adjuster screw having a hemispherical portion as the swing center of the first arm to the lower end The nut is screwed onto the upper part of the adjuster screw, and the base of the rotating member is rotatably fitted to the part of the adjuster screw located between the nut and the first arm.

The external fitting of the base portion of the rotating member to the adjusting screw is not particularly limited, but the following mode is exemplified.
[1] The base of the rotating member is fitted onto the adjusting screw by providing a cylindrical portion having a circular outer peripheral surface at the lower end of the nut, and the base of the rotating member is rotatably fitted on the cylindrical portion. It is done by doing.
[2] External fitting of the base portion of the rotating member with respect to the adjusting screw is performed by fitting a cylindrical member having a circular outer peripheral surface onto a portion of the adjusting screw located between the nut and the second arm. The moving member is rotatably fitted to the outside.

The first arm and the second arm may be installed side by side in the width direction, but one is an inner arm installed inside the other width direction and the other one It is preferable that the outer arm be installed on the outer side in the width direction. Although the specific mode is not particularly limited, the following modes are exemplified.

<C> The first arm includes one first side portion that is on one side in the width direction of the second arm, another first side portion that is on the other side of the second arm in the width direction, and both first sides. It has a first connecting part that connects the parts together. Then, the base portion of the rotating member is attached to the first connecting portion.
<D> The second arm includes one second side portion located on one side in the width direction of the first arm and the other second side portion located on the other side in the width direction of the first arm. The rotating member includes two engaging portions, and when rotating in the engaging direction, one engaging portion engages with the one second side portion and the other engaging portion with the other engaging portion. When engaged with the two side portions and rotated in the releasing direction, the engagement between the one engaging portion and the one second side portion is released, and the other engaging portion and the other second side portion are released. Is disengaged.

The modes of the first arm (arm on the rotating member side) and the second arm (arm on the engaged side) are not particularly limited, but the following modes are exemplified.
[1] The first arm (rotating member side) is driven by the first cam (low lift cam) and drives the valve when swinging. The second arm (engaged side) is driven by a second cam (high lift cam) having a larger lift amount and working angle than the first cam. The connection state is a high lift drive state in which the valve is driven according to the profile of the second cam, and the non-connection state is a low lift drive state in which the valve is driven according to the profile of the first cam.
[2] The first arm (rotating member side) is driven by the first cam (high lift cam). The second arm (engaged side) is driven by a second cam (low lift cam) having a lift amount and working angle smaller than that of the first cam, and also drives the valve when swinging. The connected state is a high lift drive state in which the valve is driven according to the profile of the first cam, and the uncoupled state is a low lift drive state in which the valve is driven according to the profile of the second cam.
[3] The first arm (rotating member side) drives the valve when swinging. The second arm (engaged side) is driven by the cam. The connected state is a drive state for driving the valve, and the non-connected state is a rest state for stopping the drive.
[4] The first arm (rotating member side) is driven by the cam. The second arm (engaged side) drives the valve when swinging. The connected state is a drive state for driving the valve, and the non-connected state is a rest state for stopping the drive.

Next, examples of the present invention will be described. However, the present invention is not limited to the embodiments, and may be implemented by arbitrarily changing the configuration and shape of each part without departing from the spirit of the invention.

The variable valve mechanism 1 of the internal combustion engine of the first embodiment shown in FIGS. 1 to 5 opens and closes the valve 7 by periodically pressing the valve 7 to which a valve spring (not shown) is attached. The variable valve mechanism 1 includes a camshaft 9, a rocker arm 29, and a switching device 59.

[Camshaft 9]
The camshaft 9 makes one revolution every time the internal combustion engine makes two revolutions. On the cam shaft 9, two first cams 10 (low lift cams) are formed at intervals in the length direction, and a second cam 20 (high lift cam) is formed between them. Each first cam 10 is configured to include a first base circle 11 having a circular cross section and a first nose 13 protruding from the first base circle 11. The second cam 20 includes a second base circle 22 having a circular cross section and a second nose 24 protruding from the second base circle 22. The lift amount and working angle of the second nose 24 are larger than the lift amount and working angle of the first nose 13. In the above [brief description of the drawings] and below, when the first nose 13 or the second nose 24 acts on the rocker arm 29 (that is, at least the second nose 24 acts on the second arm 40, The time when the first nose 13 and the second nose 24 are not acting on the rocker arm 29 is referred to as "base time". ,

[Rocker Arm 29]
The rocker arm 29 drives the valve 7 by being rocked by being driven by the cams 10 and 20. The rocker arm 29 includes a first arm 30 and a second arm 40.

The first arm 30 is an outer arm installed outside the second arm 40 in the width direction. Specifically, the first arm 30 includes one first side portion 30a that is located on one side in the width direction of the second arm 40 and another first side portion 30b that is located on the other side of the second arm 40 in the width direction. , A first connecting portion 30c on the rear side that connects the rear end portions of the first side portions 30a and 30b, a first connecting portion 30d on the front side that connects the front end portions of the first side portions 30a and 30b, and The first side portions 30a and 30b are provided with an intermediate first connecting portion 30e that connects the longitudinal intermediate portions. Then, the roller shaft 33 is attached to the middle portions of the first side portions 30a and 30b in the longitudinal direction so as to penetrate the first side portions 30a and 30b, and the first cam 10 is attached to both end portions of the roller shaft 33. A roller 31 that abuts on is rotatably attached via a bearing (not shown). The lower surface of the second connecting portion 40d on the front side is in contact with the upper surface of the valve 7, and drives the valve 7 by pushing it downward during swinging. Further, the other first side portion 30b is provided with a concave portion 36 for avoiding interference (contact) with the engaging portion 64 of the rotating member 60 in the non-connected state.

A female screw hole 34 is provided in the connecting portion 30c on the rear side of the first arm 30 so as to vertically penetrate therethrough, and an adjusting screw 38 is screwed into the female screw hole 34. Specifically, the adjust screw 38 includes a hemispherical portion 38b which is the swing center of the first arm 30 and a male screw portion 38a which extends upward from the hemispherical portion 38b. The lower part of the male screw part 38 a (the lengthwise intermediate part of the adjusting screw 38) is screwed into the female screw hole 34. A nut 39 is screwed onto the upper part of the male screw portion 38a. The nut 39 is provided with a hexagonal portion 39a having a hexagonal cross-sectional shape, an umbrella portion 39b provided below the hexagonal portion 39a and larger in the radial direction than the hexagonal portion 39a, and below the umbrella portion 39b. It is configured to include a cylindrical portion 39c, which is smaller in the radial direction than the umbrella portion 39b and has a circular outer peripheral surface. A support member 50 having a hemispherical recess 53 on the upper surface is installed below the adjusting screw 38, and the hemisphere 38b of the adjusting screw 38 is swingably mounted on the hemispherical recess 53. ..

The second arm 40 is an inner arm installed inside the first arm 30 in the width direction. The front end of the second arm 40 is connected to the front end of the first arm 30 via a connecting shaft 48 so as to be relatively swingable. A slipper 42 that comes into contact with the second cam 20 is provided on the upper surface of the rear portion of the second arm 40, and the second arm 40 is driven by the second cam 20 to swing. A lost motion spring 49 that urges the second arm 40 toward the second cam 20 is installed between the first connecting portion 30e in the middle of the first arm 30 and the second arm 40. In the unconnected state, the second arm 40 swings idly.

[Switching device 59]
The switching device 59 is a device that switches between a connected state in which the first arm 30 and the second arm 40 are connected and a non-connected state in which the connection is released. The switching device 59 includes a rotating member 60 and a rotating device 70.

The rotating member 60 includes a base portion 63, an engaging portion 64 protruding from the base portion 63, and an abutted portion 67. The base portion 63 is rotatably fitted onto the cylindrical portion 39c of the nut 39. Further, the base portion 63 is sandwiched between the lower surface of the umbrella portion 39b of the nut 39 and the upper surface of the rear-side first connecting portion 30c of the adjusting screw 38 with a pivotable clearance. As a result, the rotating member 60 is attached to the rear first connecting portion 30c so as to be rotatable around the axis line x of the adjusting screw 38. The engaging portion 64 projects forward from the base portion 63, and the contacted portion 67 projects rearward from the base portion 63. Therefore, both the engaging portion 64 and the contacted portion 67 project from the base portion 63 in a direction orthogonal to the axis x of the adjusting screw 38. In the following, one of the adjusting screws 38 around the axis x is referred to as an "engagement direction R1", and the other around the axis x is referred to as a "disengagement direction R2".

The rotating device 70 rotates the rotating member 60 in the engaging direction R<b>1 to move the engaging portion 64 into a position right below the rear end portion of the second arm 40, thereby causing the engaging portion 64 to move. Engage the rear end of the. As a result, the connection state is switched. On the other hand, the rotation device 70 rotates the rotation member 60 in the releasing direction R2 to displace the engagement portion 64 from directly below the rear end portion of the second arm 40 to the side thereof. To release. As a result, it is switched to the non-connected state.

The rotating device 70 is provided behind the rocker arm 29 and extends in the width direction of the rocker arm 29, a contact member 76 attached to the control shaft 71, and the control shaft 71 is displaced in the length direction thereof. And an actuator. The abutting member 76 connects the engaging abutting piece 76a and the releasing abutting piece 76b protruding forward from the control shaft 71, and the connecting ends of the engaging abutting piece 76a and the releasing abutting piece 76b. It has a U-shape including the portion 76c and has flexibility. Specifically, the releasing contact piece 76b has a rear portion inserted into the control shaft 71, and a front portion protruding forward from the control shaft 71 to contact the contacted portion 67 from one side D1 in the length direction of the control shaft 71. Abutting. The engaging contact piece 76a has a rear part inserted through the control shaft 71, and a front part protruding forward from the control shaft 71 and contacting the contacted part 67 from the other side D2 in the length direction of the control shaft 71. There is. The connecting portion 76c is attached to the rear surface of the control shaft 71 with a bolt 77. As the actuator, an existing arbitrary (hydraulic type, electromagnetic type, etc.) actuator that displaces the shaft in the length direction may be used.

[1] Switching from the connected state to the non-connected state The switching from the connected state to the non-connected state is performed as follows. When the control shaft 71 is displaced to the other longitudinal direction D2 as shown in FIG. 3(a) during nose, the upper surface of the engaging portion 64 and the lower surface of the rear end portion of the second arm 40 are engaged by friction. The rotation of the rotating member 60 is retained as the releasing contact piece 76b bends as the engagement continues. During the subsequent base circle, as shown in FIG. 3B, the rotating member 60 is rotated in the releasing direction R2 by the elastic force of the bent releasing contact piece 76b. By the rotation, the engaging portion 64 is displaced laterally from directly below the rear end portion of the second arm 40, and the engagement between the engaging portion 64 and the second arm 40 is released. On the other hand, when the control shaft 71 is displaced in the other direction D2 in the length direction during the base circle, the rotation member 60 does not retain its rotation as shown in FIG. As shown in (b), it rotates in the releasing direction R2. Then, in any of the above cases, the engagement between the engagement portion 64 and the second arm 40 is released, so that the second arm 40 is switched to the non-connected state so that the second arm 40 swings freely as shown in FIG. become. Therefore, the valve 7 is driven according to the profile of the first cam 10 (low lift cam).

[2] Switching from the connected state to the non-connected state The switching from the connected state to the unconnected state is performed as follows. When the control shaft 71 is displaced to one side D1 in the longitudinal direction at the time of nose, as shown in FIG. 3(c), the side surface of the engaging portion 64 abuts against the side surface of the rear end portion of the second arm 40 and engages with the engaging pad. The rotation of the rotating member 60 is retained by the bending of the contact piece 76a. During the subsequent base circle, as shown in FIG. 3D, the rotating member 60 is rotated in the engaging direction R1 by the elastic force of the bent engaging contact piece 76a. By the rotation, the engaging portion 64 enters right under the rear end portion of the second arm 40, and the engaging portion 64 engages with the second arm 40. On the other hand, when the control shaft 71 is displaced in the lengthwise direction D1 on the base circle, the rotation of the rotation member 60 is not retained as shown in FIG. As shown in (d), it rotates in the engaging direction R1. Then, in any of the above cases, the engagement portion 64 engages with the second arm 40 to switch to the connected state, and as shown in FIG. 5, the first arm 30 and the second arm 40 together. It comes to rock. Therefore, the valve 7 is driven according to the profile of the second cam 20 (high lift cam).

According to this embodiment, the following effects can be obtained.
[A] Even when the linear movement type switching pin cannot be installed due to the adjusting screw 38 at a desired position (rear side connecting portion 30c) in the first arm 30 as in the present embodiment, By installing the rotating member 60 instead of the switching pin, the switching device 59 can be mounted.

[B] As shown in FIG. 3A, when the control shaft 71 is displaced to the other longitudinal direction D2 at the time of nose at the time of switching from the connected state to the non-connected state, the releasing contact piece 76b. Since the rotation of the rotating member 60 is retained until the base circle due to the bending, there is no fear that an unreasonable force is applied to the rotating member 60 when the nose is rotated.

[C] As shown in FIG. 3(c), when the control shaft 71 is displaced to one side D1 in the longitudinal direction at the time of nose when switching from the non-connected state to the connected state, the engaging contact piece 76a for engagement is used. Since the rotation of the rotating member 60 is retained by bending, the engaging contact piece 76a also has the function of the return spring of the conventional switching device 59, such as retaining the connection until the base circle. There is. Therefore, the return spring can be abolished (when the engaging contact piece 76a is considered as a return spring, it can be taken out of the rocker arm 29). Then, the rocker arm 29 can be made compact by eliminating the return spring (or putting it outside).

Example 2 shown in FIGS. 6 to 10 is an example in which the first arm 30 (arm on the rotating member 60 side) is an inner arm and the second arm 40 (arm on the engaged side) is an outer arm. In detail, compared with the first embodiment, the following points are different and the other points are the same.

A first cam 10 (low lift cam) is formed on the cam shaft 9, and two second cams 20 (high lift cam) are formed on both sides of the first cam 10. A roller 31 abutting on the first cam 10 is rotatably attached to a middle portion of the first arm 30 in the length direction via a bearing 32 and a roller shaft 33. The second arm 40 includes one second side portion 40a located on one side in the width direction of the first arm 30 and another second side portion 40b located on the other side in the width direction of the first arm 30. A second connecting portion 40c on the rear side that connects the rear portions of the two side portions 40a and 40b and a second connecting portion 40d on the front side that connects the front portions of the second side portions 40a and 40b are provided. The front end of each of the second side portions 40a and 40b is connected to the front end of the first arm 30 via a connecting shaft 48 so as to be relatively swingable. A slipper 42 that contacts the second cam 20 is provided on the upper surface of the rear portion of each of the second side portions 40a and 40b. The lost motion spring 49 is fitted onto the connecting shaft 48.

The rotating member 60 includes two engaging portions 64, one engaging portion 64a and the other engaging portion 64b. Then, as shown in FIG. 8D, when the rotating member 60 is rotated in the engaging direction R1, the one engaging portion 64a enters directly under the one first side portion 30a and engages with it. At the same time, the other engaging portion 64b enters directly under the other first side portion 30b and engages with it. Further, as shown in FIG. 8B, when the rotating member 60 rotates in the releasing direction R2, the engagement between the one engaging portion 64a and the one second side portion 40a is released, and the other The engagement between the engaging portion 64b and the other second side portion 40b is released.

According to the present embodiment, the present invention can be implemented even when the first arm 30 (arm on the rotating member 60 side) is an inner arm and the second arm 40 (arm on the engaged side) is an outer arm.

1 Variable valve mechanism (Example 1)
2 Variable valve mechanism (Example 2)
7 Valve 10 1st cam 13 1st nose 20 2nd cam 24 2nd nose 30 1st arm 30a One 1st side part 30b The other 1st side part 30c Rear side connection part 38 Adjusting screw 38b Hemisphere part 39 Nut 39c Cylindrical part 40 Second arm 40a One second side part 40b Other second side part 59 Switching device 60 Rotating member 63 Base part 64 Engaging part 67 Contacted part 70 Rotating device 71 Control shaft 76a Engagement hit Contact piece 76b Release contact piece x Adjust screw axis R1 Engagement direction R2 Release direction D1 Control shaft length direction One side D2 Control shaft length direction Other side

Claims (7)

A rocker arm (29) including a first arm (30) and a second arm (40) and driven by a cam (10, 20) to swing to drive a valve (7); and a first arm (30). It is possible to use an internal combustion engine configured to include a switching device (59) for switching the driving state of the valve (7) by switching between a connected state in which the second arm (40) is connected and a non-connected state in which the connection is released. In the variable valve mechanism,
The switching device (59) includes a base (63) attached to the first arm (30) so as to be rotatable about a predetermined axis (x), and a direction in which the base (63) intersects the axis (x). A rotating member (60) having a protruding engaging portion (64) and the rotating member (60) are rotated by engaging in one engaging direction (R1) around the axis (x). The part (64) is engaged with the second arm (40) to switch to the connected state, and the rotating member (60) is rotated in the releasing direction (R2) which is the other around the axis (x). And a turning device (70) for switching to the non-connected state by releasing the engagement,
The rotating member (60) includes an abutted portion (67) protruding from the base portion (63) in a direction intersecting the axis (x),
The rotation device (70) is provided with a control shaft (71) provided outside the rocker arm (29) and a control shaft (71) protruding from the control shaft (71) to a contacted portion (67) in a longitudinal direction of the control shaft (71). On the other hand, the releasing contact piece (76b) for rotating the rotating member (60) in the releasing direction (R2), which contacts from the (D1) side, and the contacted portion (projected from the control shaft (71) ( 67) and an engaging contact piece (76a) for contacting the rotating shaft (60) in the engaging direction (R1), which is in contact with the control shaft (71) from the other lengthwise direction (D2) side, A variable valve mechanism for an internal combustion engine, comprising an actuator for displacing a control shaft (71) in its lengthwise direction (D1, D2). The releasing contact piece (76b) has flexibility,
When the control shaft (71) is displaced when the nose (13, 24) of the cam (10, 20) is actuated when switching from the connected state to the non-connected state, the engaging portion (64) moves to the first position. By continuing to frictionally engage the two arms (40) and bending the releasing contact piece (76b), the rotation of the rotating member (60) is retained, and the bending occurs when the base circle after the nose. The variable valve mechanism according to claim 1, wherein the rotating member (60) is rotated in the releasing direction (R2) by the elastic force of the releasing contact piece (76b). The engaging contact piece (76a) has flexibility,
When the control shaft (71) is displaced when the nose (13, 24) of the cam (10, 20) acts when switching from the non-coupled state to the coupled state, the engaging portion (64) moves to the first position. The rotation of the rotating member (60) is retained by contacting the side surfaces of the two arms (40) and bending of the engaging contact pieces (76a), and the bending occurs when the base circle after the nose. The variable valve mechanism according to claim 1 or 2, wherein the rotating member (60) is rotated in the engaging direction (R1) by the elastic force of the engaging contact piece (76a). A rocker arm (29) including a first arm (30) and a second arm (40) and driven by a cam (10, 20) to swing to drive a valve (7); and a first arm (30). It is possible to use an internal combustion engine configured to include a switching device (59) for switching the driving state of the valve (7) by switching between a connected state in which the second arm (40) is connected and a non-connected state in which the connection is released. In the variable valve mechanism,
The switching device (59) includes a base (63) attached to the first arm (30) so as to be rotatable about a predetermined axis (x), and a direction in which the base (63) intersects the axis (x). A rotating member (60) having a protruding engaging portion (64) and the rotating member (60) are rotated by engaging in one engaging direction (R1) around the axis (x). The part (64) is engaged with the second arm (40) to switch to the connected state, and the rotating member (60) is rotated in the releasing direction (R2) which is the other around the axis (x). And a turning device (70) for switching to the non-connected state by releasing the engagement,
The base portion (63) of the rotating member is attached to the first arm (30) by adjusting the first arm (30) with a hemispherical portion (38b) serving as the swing center of the first arm at the lower end. The intermediate portion in the length direction of (38) is screwed, and the nut (39) is screwed on the upper part of the adjuster screw (38), so that the nut (39) of the adjuster screw (38) and the first arm (30). A variable valve mechanism for an internal combustion engine, wherein a base portion (63) of a rotating member is rotatably fitted to a portion located between them. The base portion (63) of the rotating member is fitted onto the adjusting screw (38) by providing a cylindrical portion (39c) having a circular outer peripheral surface at the lower end portion of the nut (39) and rotating the cylindrical portion (39c). The variable valve mechanism for an internal combustion engine according to claim 4, wherein a base portion (63) of the moving member is rotatably fitted to the outside. A rocker arm (29) including a first arm (30) and a second arm (40) and driven by a cam (10, 20) to swing to drive a valve (7); and a first arm (30). A switching device (59) for switching the driving state of the valve (7) by switching between a connected state in which the second arm (40) is connected and a non-connected state in which the second arm (40) is released is usable. In the variable valve mechanism,
The switching device (59) includes a base (63) attached to the first arm (30) so as to be rotatable about a predetermined axis (x), and a direction in which the base (63) intersects the axis (x). A rotating member (60) having a protruding engaging portion (64) and the rotating member (60) are rotated by engaging in one engaging direction (R1) around the axis (x). The part (64) is engaged with the second arm (40) to switch to the connected state, and the rotating member (60) is rotated in the releasing direction (R2) which is the other around the axis (x). A rotation device (70) for switching to the non-connection state by releasing the engagement,
The first arm (30) has one first side portion (30a) located on one side in the width direction of the second arm (40) and the other first side portion (30a) located on the other side in the width direction of the second arm (40). A first side part (30b) and a first connecting part (30c) connecting the first side parts (30a, 30b) to each other,
A variable valve mechanism for an internal combustion engine, wherein a base portion (63) of the rotating member is attached to the first connecting portion (30c). A rocker arm (29) including a first arm (30) and a second arm (40) and driven by a cam (10, 20) to swing to drive a valve (7); and a first arm (30). It is possible to use an internal combustion engine configured to include a switching device (59) for switching the driving state of the valve (7) by switching between a connected state in which the second arm (40) is connected and a non-connected state in which the connection is released. In the variable valve mechanism,
The switching device (59) includes a base (63) attached to the first arm (30) so as to be rotatable about a predetermined axis (x), and a direction in which the base (63) intersects the axis (x). A rotating member (60) having a protruding engaging portion (64) and the rotating member (60) are rotated by engaging in one engaging direction (R1) around the axis (x). The part (64) is engaged with the second arm (40) to switch to the connected state, and the rotating member (60) is rotated in the releasing direction (R2) which is the other around the axis (x). And a turning device (70) for switching to the non-connected state by releasing the engagement,
The second arm (40) has one second side portion (40a) located on one side in the width direction with respect to the first arm (30) and the other second side portion (40a) located on the other side in the width direction with respect to the first arm (30). With two side parts (40b),
The rotating member (60) includes two engaging portions (64), and when rotating in the engaging direction (R1), one engaging portion (64a) engages with one second side portion (40a). When the other engaging portion (64b) engages with the other second side portion (40b) and rotates in the releasing direction (R2), the other engaging portion (64a) and the second engaging portion (64a) The engagement with the side portion (40a) is released, and the engagement with the other engagement portion (64b) and the other second side portion (40b) is released. Variable valve mechanism.

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