JP2021076033A - Locker arm - Google Patents

Abstract

To provide a locker arm suppressing the occurrence of malfunction.SOLUTION: A locker arm 1 has an arm body 11 that has a first part 11a, a second part 11b, and a third part 11c with a tip end portion disposed at a position deviated to one surface side of a virtual plane VP11, a bearing 12, and a screw 13 abutting on a valve. The third part 11c has a main piece 111b extended from an end edge of the main piece 111a of the first part 11a, and two side pieces 112d and 114d respectively extended from both end edges in a lateral direction of the main piece 111b in the thickness direction of the main piece 111b. The thickness of a side piece 114d is thicker than the thickness of a tip end portion 112e of the side piece 112d, and length in the thickness direction of the main piece 111b of the side piece 114d is longer than the length in the thickness direction of the main piece 111b of the tip end portion 112e of the side piece 112d.SELECTED DRAWING: Figure 2

Description

The present invention relates to a rocker arm.

Proposed a valve gear that includes an intake rocker shaft, a first intake rocker arm, and a second intake rocker arm, the intake rocker shaft is supported by a cylinder head, and the first intake rocker arm and the second intake rocker arm are supported by the intake rocker shaft. (See, for example, Patent Document 1). Here, the first intake rocker arm and the second intake rocker arm can swing around the intake rocker shaft, respectively. At one end of the first intake rocker arm, a rotatable roller is provided around a rotation axis parallel to the swing axis of the first rocker arm. Further, at the other end of the first intake rocker arm, two adjuster screws parallel to each other in the swing axis direction of the first intake rocker arm are provided. In this type of valve gear, when the first intake rocker arm is viewed from a direction orthogonal to the swing axis of the first intake rocker arm, the position of the roller is described above with respect to the central position between the two adjuster screws. May be displaced in the direction of the swing axis. In this case, if there is a difference in the forces acting on the valves that abut on the two adjuster screws, a force in the twisting direction acts on the first intake rocker arm.

JP-A-2018-86887

On the other hand, in order to reduce the weight of the rocker arm, a rocker arm manufactured by using so-called sheet metal processing is provided. Then, it has been proposed to manufacture a rocker arm of the same type as the above-mentioned rocker arm by using sheet metal processing. In this case, since the rigidity of the rocker arm is reduced, the rocker arm is twisted by the force acting on the rocker arm in the twisting direction, and the inclination of the two adjuster screws provided at the tip of the rocker arm becomes large. Then, there is a possibility that the valve gear may malfunction due to the inclination of these two adjuster screws.

The present invention has been made in view of the above reasons, and an object of the present invention is to provide a rocker arm in which the occurrence of malfunction is suppressed.

In order to achieve the above object, the rocker arm according to the present invention
A rocker arm that is rocked and driven by a rotating cam.
The first portion swingably supported by the support member and the first direction side orthogonal to the swing axis of the first portion with respect to the first portion or the second direction opposite to the first direction side. A first arm body having a second portion located on the side and a third portion located on the second direction side with respect to the first portion.
A first cam contact portion provided at the second portion and in contact with the cam, and a first cam contact portion.
A valve contact portion provided at the tip of the third portion and in contact with the valve is provided.
The third portion is at least at the center of the tip portion in the swing axis direction at a position orthogonal to the swing axis and deviated to one surface side of the virtual plane passing through the first cam contact portion in the swing axis direction. The thickness of the first main piece from each of the first main piece extending from the end edge of the first part on the second direction side and both end edges of the first main piece in the lateral direction. It has two first side pieces that extend in one direction along the direction,
The thickness of one of the ends of each of the two first side pieces opposite to the first part side, which is far from the virtual plane, is thicker than the thickness of the other near the virtual plane, or said. The length of one of the first main pieces in the thickness direction is longer than the length of the other first main piece in the thickness direction.

According to the present invention, the thickness of one of the ends of the two first side pieces opposite to the first part side, which is closer to the virtual plane, is thinner than the thickness of the other far from the virtual plane. Further, the length of one of the ends of the two first side pieces in the thickness direction of the first main piece is shorter than the length of the other first main piece in the thickness direction. Thereby, the rigidity of the other end of the two first side pieces can be increased as compared with the rigidity of one. Therefore, the difference in the amount of displacement caused by the difference in the rigidity of each of the two first side pieces can be reduced, so that the rocker arm malfunctions due to the inclination of the valve contact portion due to the twist of the first arm body. It is suppressed.

It is a side view which shows the use state of the rocker arm which concerns on Embodiment 1 of this invention. (A) is a bottom view of the rocker arm according to the first embodiment, (B) is a plan view of the rocker arm according to the first embodiment, and (C) is a front view of the rocker arm according to the first embodiment. .. It is a perspective view of the rocker arm which concerns on Embodiment 1. FIG. It is a perspective view of the rocker arm which concerns on Embodiment 2 of this invention. (A) is a side view of the rocker arm according to the second embodiment, and (B) is a bottom view of the rocker arm according to the second embodiment. It is a front view of the rocker arm which concerns on Embodiment 2. FIG. It is a perspective view of the rocker arm which concerns on Embodiment 3 of this invention. (A) is a side view of the rocker arm according to the third embodiment, (B) is a plan view of the rocker arm according to the third embodiment, and (C) is a bottom view of the rocker arm according to the third embodiment. .. (A) is a perspective view of the rocker arm according to the third embodiment, and (B) is a perspective view of the rocker arm according to the third embodiment as viewed from another direction. It is a perspective view of the rocker arm which concerns on Embodiment 4 of this invention. (A) is a side view of the rocker arm according to the fourth embodiment, (B) is a plan view of the rocker arm according to the fourth embodiment, and (C) is a bottom view of the rocker arm according to the fourth embodiment. .. (A) is a perspective view of the rocker arm according to the fourth embodiment, and (B) is a perspective view of the rocker arm according to the fourth embodiment when viewed from another direction. It is a perspective view of the rocker arm which concerns on Embodiment 4. FIG. It is a perspective view of the rocker arm which concerns on Embodiment 5 of this invention. (A) is a side view of the rocker arm according to the fifth embodiment, (B) is a plan view of the rocker arm according to the fifth embodiment, and (C) is a bottom view of the rocker arm according to the fifth embodiment. .. (A) is a perspective view of the rocker arm according to the fifth embodiment, and (B) is a perspective view of the rocker arm according to the fifth embodiment as viewed from another direction. A rocker arm according to a modified example is shown, (A) is a perspective view, and (B) is a bottom view.

(Embodiment 1)
Hereinafter, the rocker arm according to the embodiment of the present invention will be described with reference to the drawings. The rocker arm according to the present embodiment is a rocker arm that is rocked and driven by a rotating cam. This rocker arm includes a first arm main body, a first cam contact portion, and a valve contact portion. The first arm body has a first portion that is swingably supported by a support member, a second portion that is located on the first direction side orthogonal to the swing axis of the first portion with respect to the first portion, and a first portion. It has a third part located on the second direction side opposite to the first direction side with respect to one part. The first cam contact portion is provided at the second portion of the first arm main body and contacts the cam. The valve contact portion is provided at the tip of the third portion of the first arm body and contacts the valve. The third part of the first arm body is at least at the center of the tip portion in the swing axis direction at a position orthogonal to the swing axis and shifted to one side of the virtual plane passing through the first cam contact portion in the swing axis direction. The part is arranged. Further, the third portion is the first from the first main piece extending from the above-mentioned second end side edge of the first portion of the first arm body and both end edges of the first main piece in the swing axis direction. It has two first side pieces extending in one direction along the thickness direction of one main piece. The thickness of one of the ends of each of the two first side pieces on the side opposite to the first part side, which is close to the virtual plane, is thinner than the thickness of the other end far from the virtual plane. Further, the length in the thickness direction of one of the above-mentioned first main pieces of the ends of each of the two first side pieces is longer than the length in the thickness direction of the other first main piece.

As shown in FIG. 1, the rocker arm 1 according to the present embodiment is mounted on, for example, an engine of a vehicle, and when the cam C1 rotates around the rotation axis J1 in the direction indicated by the arrow AR1, it swings as shown by the arrow AR2. It is a so-called center pivot type rocker arm that opens and closes the valve 100 of the cylinder head (not shown). As shown in FIG. 1, the rocker arm 1 includes an arm body 11, a bearing 12, and a screw 13. Further, the rocker arm 1 includes a shaft 14 fixed to the arm body 11 and supporting the inner ring of the bearing 12. Here, the rocker arm 1 swings around a swing shaft J12 that coincides with the central axis of the shaft 200 inserted through the through hole 112a of the arm body 11. The bearing 12 has an outer ring, an inner ring arranged inside the outer ring, a plurality of rolling elements interposed between the outer ring and the inner ring, and a cage for holding the plurality of rolling elements, and the outer ring is a cam. This is a first cam contact portion that is in contact with C1 and whose inner ring is fixed to the arm body 11.

The arm body 11 is a first arm body having a first part 11a, a second part 11b, and a third part 11c. The arm body 11 is formed by pressing a single plate-shaped base material prepared by punching a metal plate such as a steel plate. As the steel plate, for example, hardened steel (for example, SCM415) can be adopted. The first portion 11a is swingably supported by the shaft 200, which is a support member. As shown in FIGS. 2A and 2B, the second portion 11b is on the first direction side orthogonal to the swing axis J12 of the first portion 11a with respect to the first portion 11a, that is, on the −X direction side. Located in. The third portion 11c is located on the second direction side opposite to the first direction side with respect to the first portion 11a, that is, on the + X direction side. Further, in the third portion 11c, the central portion of the tip portion in the swing axis J12 direction is orthogonal to the swing shaft J12, and the central portion of the second portion 11b in the swing axis J12 direction, that is, a virtual plane passing through the bearing 12. It is arranged on one side of the VP11, that is, at a position shifted in the −Y direction. As a result, the central axis of the screw 13 fixed to the third portion 11c is arranged at a position separated from the virtual plane VP11 by a distance W1. The first portion 11a has a main piece 111a and side pieces 112c and 114c. The main piece 111a is a second main piece continuous with the main piece 111b at the edge on the + X direction side. The side pieces 112c and 114c are second side pieces extending from both end edges of the main piece 111a in the Y-axis direction in one direction along the thickness direction of the main piece 111a, that is, in the −Z direction. The side pieces 112c and 114c each have an annular shape that surrounds the through holes 112a and 114a through which the shaft 200 is inserted and the through holes 112a and 114a and projects from the outer peripheral portions of the through holes 112a and 114a on the side facing each other. Ribs 112b and 114b are provided.

The second portion 11b has support pieces 113 and 115 that support the extension bearing 12 in the −X direction from the edge of the side pieces 112c and 114c on the −X direction side, respectively. As shown in FIG. 1, the support piece 113 is provided with a through hole 113a which is circular in a plan view and penetrates the support piece 113 in the thickness direction. Further, the support piece 115 is also provided with a through hole 115a (see FIG. 3) which is circular in a plan view and penetrates the support piece 115 in the thickness direction. Then, the shaft 14 is fixed to the support pieces 113 and 115 in a state of being inserted into the through holes 113a and 115a of the support pieces 113 and 115 to support the inner ring of the bearing 12, where the outer ring of the bearing 12 is , The shaft 14 is rotatable around the central axis J11.

The third portion 11c has a main piece 111b and side pieces 112d and 114d, as shown in FIGS. 2A and 2B. The main piece 111b is a first main piece extending from the edge of the main piece 111a of the first portion 11a on the + X direction side. The side pieces 112d and 114d are first side pieces extending from both end edges of the main piece 111b in the Y-axis direction in one direction along the thickness direction of the main piece 111b, that is, in the −Z direction. Further, a through hole 111d that penetrates the main piece 111b in the thickness direction is provided at the tip of the main piece 111b. Further, on the −Z direction side of the tip portion of the main piece 111b, an annular rib 111c that surrounds the through hole 111d and projects from the outer peripheral portion of the through hole 111d toward the −Z direction along the thickness direction of the main piece 111b. Is provided. Then, as shown in FIG. 2C, the side piece 112d is located closer to the virtual plane VP11 than the side piece 114d. Further, as shown in FIG. 3, the thickness T12 of the side piece 114d is thinner than the thickness T11 of the tip portion 112e of the side piece 112d far from the virtual plane VP11. Further, the length H12 of the main piece 111b of the side piece 114d in the thickness direction is longer than the length H11 of the tip portion 112e of the side piece 112d in the thickness direction of the main piece 111b.

The screw 13 is a valve contact portion provided at the tip of the third portion 11c of the arm main body 11 and abuts on the valve.

As described above, in the rocker arm 1 according to the present embodiment, the thickness T12 of the side piece 114d is thinner than the thickness T11 of the tip portion 112e of the side piece 112d far from the virtual plane VP11. Further, the length H12 of the main piece 111b of the side piece 114d in the thickness direction is longer than the length H11 of the tip portion 112e of the side piece 112d in the thickness direction of the main piece 111b. Thereby, the rigidity of the side piece 114d can be increased as compared with the rigidity of the side piece 112d. Therefore, since the difference in the amount of displacement caused by the difference in the rigidity of the two side pieces 112d and 114d can be reduced, the occurrence of malfunction of the rocker arm 1 due to the inclination of the screw 13 due to the twist of the arm body 11 is suppressed. Will be done.

Further, in the rocker arm 1 according to the present embodiment, the first portion 11a includes a main piece 111a and two side pieces 112c and 114c extending in the −Z direction from both end edges of the main piece 111a in the Y-axis direction. , Have. The side pieces 112c and 114c each have an annular shape that surrounds the through holes 112a and 114a through which the shaft 200 is inserted and the through holes 112a and 114a and projects from the outer peripheral portions of the through holes 112a and 114a on the side facing each other. Ribs 112b and 114b are provided. As a result, it is possible to prevent the shaft 200 from being abnormally worn.

(Embodiment 2)
The rocker arm according to the present embodiment has two valve contact portions, and the two valve contact portions are in the swing axis direction at the tip of the first main piece of the third portion of the arm body, respectively. It differs from the first embodiment in that it is fixed to both ends.

As shown in FIG. 4, the rocker arm 2001 according to the present embodiment includes an arm body 2011, a bearing 2012, and two screws 2013 that come into contact with a valve (not shown). Further, the rocker arm 2001 includes a shaft 2014 fixed to the arm body 2011 and supporting the inner ring of the bearing 2012, and a cylindrical shaft guide 2015. Here, as shown in FIGS. 5A and 5B, the rocker arm 2001 swings so as to coincide with the central axis of the shaft guide 2015 with the shaft (not shown) inserted inside the shaft guide 2015. It swings around the shaft J22. The bearing 2012 is a first cam contact portion in which the outer ring is in contact with a cam (not shown) and the inner ring is fixed to the arm body 2011.

The arm body 2011 is a first arm body having a first part 2011a, a second part 2011b, and a third part 2011c. Similar to the arm main body 11 according to the first embodiment, the arm main body 2011 is formed by pressing a single plate-shaped base material prepared by punching a metal plate such as a steel plate. It is formed. The first portion 2011a is swingably supported by a shaft inserted inside the shaft guide 2015. The second portion 2011b is located on the −X direction side with respect to the first portion 2011a. The third portion 2011c is located on the + X direction side with respect to the first portion 2011a. Further, in the third portion 2011c, the central portion of the tip portion in the swing axis J22 direction is orthogonal to the swing shaft J22, and the central portion of the second portion 2011b in the swing axis J22 direction, that is, a virtual plane passing through the bearing 2012. It is arranged on one side of the VP21, that is, at a position deviated from the −Y direction side. The first portion 2011a has a main piece 2111a and side pieces 2112c and 2114c. The main piece 2111a is a second main piece that is continuous with the main piece 2111b at the edge on the + X direction side. The side pieces 2112c and 2114c are second side pieces extending in the −Z direction from both end edges of the main piece 2111a in the Y-axis direction. The side pieces 2112c and 2114c are each provided with through holes 2112a and 2114a through which the shaft guide 2015 is inserted.

The second portion 2011b has support pieces 2113 and 2115 that support the extension bearing 2012 in the −X direction from each of the edges of the side pieces 2112c and 2114c on the −X direction side. As shown in FIGS. 5A and 5B, the support piece 2115 is provided with a through hole 2115a which is circular in a plan view and penetrates the support piece 2115 in the thickness direction. Further, the support piece 2113 is also provided with a through hole 2113a which is circular in a plan view and penetrates the support piece 2113 in the thickness direction. Then, the shaft 2014 is fixed to the support pieces 2113 and 2115 in a state of being inserted into the through holes 2113a and 2115a of the support pieces 2113 and 2115 to support the inner ring of the bearing 2012. Here, the outer ring of the bearing 2012 is rotatable around the central axis J21 of the shaft 2014.

As shown in FIG. 5B, the third portion 2011c has a main piece 2111b and side pieces 2112d and 2114d. The main piece 2111b is a first main piece extending from the edge of the main piece 2111a of the first portion 2011a on the + X direction side. The side pieces 2112d and 2114d are first side pieces extending in the −Z direction from both end edges of the main piece 2111b in the Y-axis direction. Further, as shown in FIG. 4, through holes 2111e that penetrate the main piece 2111b in the thickness direction are provided at both ends of the tip of the main piece 2111b in the Y-axis direction. Further, as shown in FIG. 5B, a through hole 2111e is surrounded on the −Z direction side at the tip of the main piece 2111b, and the through hole 2111e is surrounded by the outer peripheral portion of the main piece 2111e along the thickness direction of the main piece 2111b. An annular rib 2111c protruding in the Z direction is provided. Further, as shown in FIG. 6, the thickness T22 of the side piece 2114d is thicker than the thickness T21 of the tip portion 2112e of the side piece 2112d. Further, the length H22 of the main piece 2111b of the side piece 2114d in the thickness direction is longer than the length H21 of the tip portion 2112e of the side piece 2112d in the thickness direction of the main piece 2111b.

As shown in FIG. 4, the screw 2013 is fixed to both ends in the swing axis J22 direction, that is, in the Y axis direction at the tip of the main piece 2111b of the third portion 2011c of the arm body 2011, and is a valve (not shown). ) Is the valve contact part that comes into contact with.

As described above, in the rocker arm 2001 according to the present embodiment, the thickness T22 of the tip portion of the side piece 2114d is thicker than the thickness T21 of the tip portion 2112e of the side piece 2112d. Further, the length H22 of the tip portion of the side piece 2114d in the thickness direction of the main piece 2111b is longer than the length H21 of the tip portion 2112e of the side piece 2112d in the thickness direction of the main piece 2111b. Thereby, the rigidity of the side piece 2114d can be increased as compared with the rigidity of the side piece 2112d. Therefore, since the difference in the amount of displacement caused by the difference in rigidity between the two side pieces 2112d and 2114d can be reduced, the occurrence of malfunction of the rocker arm 2001 due to the inclination of the screw 2013 due to the twist of the arm body 2011 is suppressed. Will be done. Therefore, since the occurrence of twisting of the arm body 2011 is suppressed, the occurrence of malfunction of the rocker arm 2001 due to the inclination of the + X direction end of the main piece 2111b or the screw 2013 due to the twisting of the arm body 2011 is suppressed. To.

Further, in the rocker arm 2001 according to the present embodiment, two screws 2013 are fixed to both ends in the Y-axis direction at the tip of the main piece 2111b on the + X direction side. This makes it possible to drive two valves at the same time.

Further, the rocker arm 2001 according to the present embodiment includes a shaft guide 2015 that is inserted into through holes 2114a provided in each of the two side pieces 2112c and 2114c. As a result, the distance between the two side pieces 2112c and 2114c of the first portion 2011a of the arm body 2011 is prevented from being excessively separated, so that the rocker arm 2001 malfunctions due to the deformation of the arm body 2011. It is suppressed.

(Embodiment 3)
The rocker arm according to the present embodiment has a long support plate extending in the swing axis direction of the first arm body and two valve contact portions provided at both ends in the longitudinal direction of the support plate and in contact with the valves. It differs from the first and second embodiments in that it includes a part. Here, the first arm body has a first portion that is swingably supported by a support member and a second portion that is located on the first direction side orthogonal to the swing axis of the first portion with respect to the first portion. And a third portion located on the second direction side opposite to the first direction side with respect to the first portion. The third portion of the first arm body has two third side pieces extending from the above-mentioned end edge of the first portion of the first arm body on the second direction side, and at least the tip portion swings. The central portion in the axial direction is arranged at a position orthogonal to the swing axis and shifted to one surface side of the virtual plane passing through the central portion in the swing axis direction of the second portion described above. Further, the second virtual plane that passes through the central portion of the end portion of each of the two third side pieces opposite to the first portion side in the swing axis direction and is orthogonal to the swing axis is the length of the support plate described above. It is located on the side opposite to the first virtual plane side with respect to the third virtual plane that passes through the central portion of the two valve contact portions in the direction and is orthogonal to the swing axis.

As shown in FIG. 7, the rocker arm 3001 according to the present embodiment includes an arm body 3011, a bearing 3012, and two screws 3013 that come into contact with a valve (not shown). Further, the rocker arm 3001 includes a shaft 3014 fixed to the arm body 3011 and supporting the inner ring of the bearing 3012, a cylindrical shaft guide 3015, and a support plate 3016. Here, as shown in FIGS. 8A to 8C, the rocker arm 3001 swings in a state where the shaft (not shown) is inserted inside the shaft guide 3015 and coincides with the central axis of the shaft guide 3015. It swings around the shaft J32. The bearing 3012 is a cam contact portion in which the outer ring is in contact with the cam (not shown) and the inner ring is fixed to the arm body 3011. A through hole 3015a is formed in the shaft guide 3015.

The arm body 3011 is a first arm body having a first part 3011a, a second part 3011b, and a third part 3011c. Similar to the arm main body 11 according to the first embodiment, the arm main body 3011 is formed by pressing a single plate-shaped base material prepared by punching a metal plate such as a steel plate. It is formed. The first portion 3011a is swingably supported by a shaft inserted inside the shaft guide 3015. The second portion 3011b is located on the −X direction side with respect to the first portion 3011a. The third portion 3011c is located on the + X direction side with respect to the first portion 3011a. Further, in the third portion 3011c, one surface of the first virtual plane VP31 in which the central portion of the tip portion in the swing axis J32 direction is orthogonal to the swing shaft J32 and passes through the central portion of the second portion 3011b in the swing axis J32 direction. It is arranged at a position shifted to the side, that is, to the −Y direction side. The first portion 3011a has a main piece 3111 and side pieces 3112c and 3114c. The side pieces 3112c and 3114c extend in the −Z direction from both end edges of the main piece 3111 in the Y-axis direction. Each of the side pieces 3112c and 3114c is provided with through holes 3112a and 3114a through which the shaft guide 3015 is inserted.

The second portion 3011b has support pieces 3113 and 3115 that support the extension bearing 3012 in the −X direction from each of the edges of the side pieces 3112c and 3114c on the −X direction side. As shown in FIG. 8A, the support piece 3115 is provided with a through hole 3115a which is circular in a plan view and penetrates the support piece 3115 in the thickness direction. Further, the support piece 3113 is also provided with a through hole (not shown) which is circular in a plan view and penetrates the support piece 3113 in the thickness direction. Then, the shaft 3014 is fixed to the support pieces 3113 and 3115 in a state of being inserted into the through holes 3115a of the support pieces 3113 and 3115 to support the inner ring of the bearing 3012. Here, the outer ring of the bearing 3012 is rotatable around the central axis J31 of the shaft 3014.

The third site 3011c has side pieces 3112d and 3114d, as shown in FIGS. 8B and 8C. The side pieces 3112d and 3114d are third side pieces extending in the + X direction from each of the side pieces 3112c and 3114c on the + X direction side of the first portion 3011a. Here, the second virtual plane VP32 that passes through the central portion of the tip portion of the side pieces 3112d and 3114d on the + X direction side in the Y-axis direction and is orthogonal to the swing axis J32 of the arm body 3011 is orthogonal to the swing axis J32. Moreover, it is arranged at a position shifted to one surface side of the first virtual plane VP31 passing through the central portion of the second portion 3011b in the swing axis direction, that is, to the −Y direction side.

The support plate 3016 has a long plate shape, and through holes 3016a penetrating in the thickness direction are formed at both ends in the longitudinal direction and extend in the swing axis J32 direction of the arm body 3011. .. The thickness of the support plate 3016 is preferably thicker than the thickness of the side pieces 3112c and 3114c. Then, as shown in FIGS. 9A and 9B, the two side pieces 3112d and 3114d each pass through the central portion in the swing axis J32 direction of the end portion opposite to the first portion 3011a side and swing. The second virtual plane VP32 orthogonal to the driving axis J32 passes through the central portion of the two screws 3013 in the longitudinal direction of the support plate 3016 and is on the first virtual plane side with respect to the third virtual plane VP33 orthogonal to the swing axis J32. It is located on the opposite side of. That is, the second virtual plane VP32 that passes through the central portion in the direction of the swing axis J32 and is orthogonal to the swing axis J32 at the end opposite to the first portion 3011a side of each of the two side pieces 3112d and 3114d is supported. It is located on the −Y direction side of the third virtual plane VP33 that passes through the central portion of the two screws 3013 in the longitudinal direction of the plate 3016 and is orthogonal to the swing axis J32.

Each of the two screws 3013 is a valve contact portion that is fixed to the support plate 3016 in a state of being inserted into through holes 3016a provided at both ends in the longitudinal direction of the support plate 3016 and abuts on the valve.

As described above, the rocker arm 3001 according to the present embodiment is a second virtual plane that passes through the central portion of each of the two side pieces 3112d and 3114d in the swing axis J32 direction and is orthogonal to the swing axis J32. The VP 32 is located on the −Y direction side of the third virtual plane VP 33 that passes through the central portion of the two screws 3013 in the longitudinal direction of the support plate 3016 and is orthogonal to the swing axis J32. As a result, the balance of the torque applied to the support plate 3016 from the two side pieces 3112d and 3114d can be adjusted, so that the balance of the displacement amount generated at both ends of the support plate 3016 in the Y-axis direction can be adjusted. .. Therefore, since the occurrence of twisting of the arm body 3011 is suppressed, the occurrence of malfunction of the rocker arm 3001 due to the inclination of the support plate 3016 or the inclination of the screw 3013 due to the twist of the arm body 3011 is suppressed.

(Embodiment 4)
The rocker arm according to the present embodiment includes a first arm main body, a first cam contact portion provided on the first arm main body and in contact with one of two cams, a second arm main body, and a second. A second cam contact portion provided on the arm body and in contact with the other of the two cams is provided. Here, the second arm main body has a fourth portion that is swingably supported by a support member, and a fifth portion that is located on the above-mentioned first direction side with respect to the fourth portion. Further, the rocker arm is provided on the first arm body and includes a locking pin capable of taking either a first position for locking the second arm body and a second position for locking the second arm body.

As shown in FIG. 10, the rocker arm 4001 according to the present embodiment includes arm bodies 4011 and 4021, bearings 4012 and 4022, and two screws 4013 that come into contact with a valve (not shown). Further, the rocker arm 4001 includes a shaft 4014 fixed to the arm body 4011 and supporting the inner ring of the bearing 4012, a shaft fixed to the arm body 4021 and supporting the inner ring of the bearing 4022 (not shown), and a cylindrical shaft guide 4015. , 4023 and. Further, the rocker arm 4001 includes a locking pin 4017, a coil spring 4018 fitted in the locking pin 4017, a clip 4019 fixed to the locking pin 4017, and a coil spring 4025 fitted in the shaft guide 4023. Be prepared. Here, as shown in FIGS. 11A to 11C, the rocker arm 4001 is connected to the central shafts of the shaft guides 4015 and 4023 with the shafts (not shown) inserted inside the shaft guides 4015 and 4023. It swings around the matching swing shafts J42 and J43. The bearings 4012 and 4022 are cam contact portions in which the outer ring is in contact with the cam (not shown) and the inner ring is fixed to the arm main body 4011 and 4021, respectively.

The arm body 4011 is a first arm body having a first part 4011a, a second part 4011b, and a third part 4011c. Similar to the arm main body 11 according to the first embodiment, the arm main body 4011 is formed by pressing a single plate-shaped base material prepared by punching a metal plate such as a steel plate. It is formed. The first portion 4011a is swingably supported by a shaft inserted inside the shaft guide 4015. The second portion 4011b is located on the −X direction side with respect to the first portion 4011a. The third portion 4011c is located on the + X direction side with respect to the first portion 4011a. Further, in the third portion 4011c, the central portion of the tip portion in the swing axis J42 direction is orthogonal to the swing shaft J42, and the second portion 4011b passes through the central portion in the swing axis J42 direction of the virtual plane VP41 in the −Y direction. It is located at a position shifted to the side. The first site 4011a has side pieces 4112c and 4114c. As shown in FIG. 11A, the side piece 4114c is provided with a through hole 4114a through which the shaft guide 4015 is inserted. Further, the side piece 4112c is also provided with a through hole (not shown) through which the shaft guide 4015 is inserted. Further, the side piece 4114c is provided with a through hole 4114g through which the locking pin 4017 is inserted, and the side piece 4112c is also provided with a through hole (not shown) through which the locking pin 4017 is inserted.

As shown in FIGS. 11B and 11C, the second portion 4011b is a support piece 4113 that supports the extension bearing 4012 in the −X direction from each end edge of the side pieces 4112c and 4114c on the −X direction side. It has 4115. As shown in FIG. 11A, the support piece 4115 is provided with a through hole 4115a which is circular in a plan view and penetrates the support piece 4115 in the thickness direction. Further, the support piece 4113 is also provided with a through hole (not shown) which is circular in a plan view and penetrates the support piece 4113 in the thickness direction. Then, the shaft 4014 is fixed to the support pieces 4113 and 4115 in a state of being inserted into the through holes 4115a of the support pieces 4113 and 4115 to support the inner ring of the bearing 4012. Here, the outer ring of the bearing 4012 is rotatable around the central axis J411 of the shaft 4014.

The third portion 4011c has a main piece 4016 and side pieces 4112d and 4114d. The side pieces 4112d and 4114d extend in the + X direction from the edges of the side pieces 4112c and 4114c of the first portion 4011a on the + X direction side. The main piece 4016 is provided so as to straddle the ends on the + X direction side at the ends on the + X direction side of each of the side pieces 4112d and 4114d. Further, as shown in FIG. 11B, through holes 4016b are provided at both ends of the tip of the main piece 4016 in the Y-axis direction to penetrate the main piece 4016 in the thickness direction. Further, as shown in FIG. 11C, a through hole 4016b is surrounded on the −Z direction side of the main piece 4016, and the through hole 4016b is surrounded by the −Z direction side along the thickness direction of the main piece 4016. An annular rib 4016a projecting to is provided. Then, the end portion of the side piece 4114d opposite to the first portion 4011a side is from the fifth portion 4021b of the arm body 4021 described later than the tip end portion 4112e on the side opposite to the first portion 4011a side of the side piece 4112d. It is located far away. Further, as shown in FIG. 12A, the thickness T42 of the side piece 4114d is thicker than the thickness T41 of the tip portion 4112e of the side piece 4112d. Further, the length H42 of the tip portion of the side piece 4112d in the thickness direction of the main piece 4016 is longer than the length H41 of the tip portion 4112e of the side piece 4112d in the thickness direction of the main piece 4016.

As shown in FIG. 10, the screw 4013 is a valve contact portion that is fixed to both ends of the main piece 4016 of the arm body 4011 in the Y-axis direction and abuts on a valve (not shown).

As shown in FIGS. 11B and 11C, the arm main body 4021 is a second arm main body having a fourth portion 4021a and a fifth portion 4021b. The arm body 4021 is formed by pressing a single plate-shaped base material prepared by punching a metal plate such as a steel plate, similarly to the arm body 4011 described above. The fourth portion 4021a is swingably supported by a shaft inserted inside the shaft guide 4023. The fifth portion 4021b is located on the −X direction side with respect to the fourth portion 4021a. The fourth portion 4021a has a main piece 4211 which is a long third main piece, and two side pieces 4212 and 4214. The side pieces 4212 and 4214 are third side pieces extending from both end edges of the main piece 4211 in the Y-axis direction in one direction along the thickness direction of the main piece 4211, that is, in the −Z direction. Further, the side piece 4214 is provided with a protruding piece 4216 that projects in the −Y direction and fixes the coil spring 4025, which will be described later. Further, the tip portion 4217 on the + X direction side of the side piece 4214 projects toward the + X direction side from the protruding piece 4216. The side piece 4212 is provided with a notch 4212a having an arc shape in a plan view.

The fifth portion 4021b has support pieces 4213 and 4215 that support the extension bearing 4022 in the −X direction from the edge of the side pieces 4212 and 4214 on the −X direction side of the fourth portion 4021a, respectively. The support pieces 4213 and 4215 are provided with through holes (not shown) that are circular in a plan view and penetrate the support pieces 4213 and 4215 in the thickness direction, respectively. Then, the shaft 4024 is fixed to the support pieces 4213 and 4215 in a state of being inserted into the through holes of the support pieces 4213 and 4215, respectively, and supports the inner ring of the bearing 4022. Here, the outer ring of the bearing 4022 is rotatable around the central axis J412 of the shaft 4024.

The locking pin 4017 has a columnar shape and is provided in the arm main body 4011 in a state of being inserted into a through hole 4114 g formed in the side pieces 4112c and 4114c of the arm main body 4011. The locking pin 4017 has a first position for locking the arm body 4021 at the end on the + Y direction side as shown in FIGS. 12A and 12B, and + Y as shown in FIG. It can take either a second position where the end on the directional side is detached from the arm body 4021. A coil spring 4018 is arranged at a portion of the locking pin 4017 on the side piece 4112c side between the side pieces 4112c and 4114c. The end of the coil spring 4018 on the −Y direction side is in contact with the annular clip 4019 fixed to the locking pin 4017. The coil spring 4018 is a first urging member that urges the locking pin 4017 in the direction from the first position described above to the second position described above. Then, as shown in FIGS. 12A and 12B, the locking pin 4017 is locked to a part of the inside of the notch 4212a of the side piece 4212 in the state where the locking pin 4017 is arranged at the first position described above. Pin 4017 comes into contact.

The coil spring 4025 is fitted at the end of the shaft guide 4023 on the + Y direction side. One end 4025a of the coil spring 4025 in the stretching direction is in contact with the −Z direction side of the protruding piece 4216 of the fourth portion 4021a. The coil spring 4025 has an arm body 4021 so that a portion of the side piece 4212 that comes into contact with the locking pin 4017 in the notch 4212a is separated from the locking pin 4017 in a state where the locking pin 4017 is arranged at the first position described above. Is a second urging member that urges the arm body 4021 in a direction of rotation around the swing shaft J43.

As described above, in the rocker arm 4001 according to the present embodiment, the thickness T42 of the tip portion of the side piece 4114d is thicker than the thickness T41 of the tip portion 4112e of the side piece 4112d. Further, the length H42 of the tip portion of the side piece 4112d in the thickness direction of the main piece 4016 is longer than the length H41 of the tip portion 4112e of the side piece 4112d in the thickness direction of the main piece 4016. Thereby, the rigidity of the side piece 4114d can be increased as compared with the rigidity of the side piece 4112d. Therefore, when the locking pin 4017 is arranged at the first position described above, that is, when the arm bodies 4011 and 4021 are connected and the cam abuts on the bearing 4022 to drive the screw 4013, 2 Since the difference in the amount of displacement caused by the difference in rigidity between the two side pieces 4112d and 4114d can be reduced, the occurrence of malfunction of the rocker arm 4001 due to the inclination of the two screws 4013 due to the twist of the arm body 4011 is suppressed. Ru.

Further, in the rocker arm 4001 according to the present embodiment, the side piece 4212 of the arm main body 4021 has a plan-view arc shape, and the locking pin 4017 is engaged with a part of the inside in a state of being arranged at the above-mentioned first position. A notch 4212a with which the stop pin 4017 abuts is provided. By forming the contact portion with the locking pin 4017 as the notch portion 4212a, the radius of the contact portion can be increased. Therefore, it is possible to prevent deformation and breakage of the side piece 4212 due to stress concentration on the side piece 4212.

Further, the rocker arm 4001 according to the present embodiment includes a coil spring 4018 that urges the locking pin 4017 in the direction from the above-mentioned first position to the above-mentioned second position. As a result, it is possible to suppress the occurrence of malfunction of the rocker arm 4001 caused by the locking pin 4017 being arranged at a position between the first position and the second position.

Further, in the rocker arm 4001 according to the present embodiment, in the state where the locking pin 4017 is arranged at the first position described above, the portion of the notch 4212a of the side piece 4212 that comes into contact with the locking pin 4017 is from the locking pin 4017. A coil spring 4025 is provided so that the arm body 4021 is urged to rotate around the swing shaft J43 so as to be separated from each other. As a result, the force acting on the side piece 4212 of the arm body 4021 from the locking pin 4017 can be relaxed, so that the force acting on the side piece 4212 of the arm body 4021 from the locking pin 4017 causes the arm body 4021. The occurrence of twisting can be suppressed.

(Embodiment 5)
Similar to the fourth embodiment, the rocker arm according to the present embodiment includes a first arm main body, a first cam contact portion provided on the first arm main body and abutting on one of two cams, and a first cam contact portion. A second arm main body and a second cam contact portion provided on the second arm main body and in contact with the other of the two cams are provided.

As shown in FIG. 14, the rocker arm 5001 according to the present embodiment includes arm bodies 5011 and 5021, bearings 5012 and 5022, and two screws 5013 that come into contact with valves (not shown). Further, the rocker arm 5001 includes a shaft 5014 fixed to the arm body 5011 and supporting the inner ring of the bearing 5012, a shaft fixed to the arm body 5021 and supporting the inner ring of the bearing 5022 (not shown), and a cylindrical shaft guide 5015. , 5023 and a support plate 5016. Further, the rocker arm 5001 includes a locking pin 5017, a coil spring 5018 fitted in the locking pin 5017, a clip 5019 fixed in the locking pin 5017, and a coil spring 5025 fitted in the shaft guide 5023. Be prepared. Here, as shown in FIGS. 15A to 15C, the rocker arm 5001 is attached to the central axis of the shaft guides 5015 and 5023 with the shaft (not shown) inserted inside the shaft guides 5015 and 5023. It swings around the matching swing shafts J52 and J53. The bearings 5012 and 5022 are cam contact portions in which the outer ring is in contact with the cam (not shown) and the inner ring is fixed to the arm main body 5011 and 5021, respectively. Through holes 5015a and 5023a are formed in the shaft guides 5015 and 5023, respectively.

The arm body 5011 is a first arm body having a first part 5011a, a second part 5011b, and a third part 5011c. Similar to the arm main body 11 according to the first embodiment, the arm main body 5011 is obtained by pressing a single plate-shaped base material prepared by punching a metal plate such as a steel plate. It is formed. The first portion 5011a is swingably supported by a shaft inserted inside the shaft guide 5015. The second portion 5011b is located on the −X direction side with respect to the first portion 5011a. The third portion 5011c is located on the + X direction side with respect to the first portion 5011a. Further, the second virtual plane VP52 that passes through the central portion of the tip of the third portion 5011c in the swing axis J52 direction and is orthogonal to the swing shaft J52 is orthogonal to the swing shaft J52 and swings the second portion 5011b. It is arranged at a position shifted in the −Y direction from the first virtual plane VP51 passing through the central portion in the axis J52 direction. The first portion 5011a has side pieces 5112c, 5114c and a main piece 5111. The main piece 5111 is provided so as to straddle the end portion of the side pieces 5112c and 5114c on the + Z direction side. As shown in FIG. 15A, the side piece 5114c is provided with a through hole 5114a through which the shaft guide 5015 is inserted. Further, the side piece 5112c is also provided with a through hole (not shown) through which the shaft guide 5015 is inserted. Further, the side piece 5114c is provided with a through hole 5114g through which the locking pin 5017 is inserted, and the side piece 5112c is also provided with a through hole (not shown) through which the locking pin 5017 is inserted.

As shown in FIGS. 15B and 15C, the second portion 5011b is a support piece 5113 that supports the extension bearing 5012 in the −X direction from each end edge of the side pieces 5112c and 4114c on the −X direction side. It has 5115. As shown in FIG. 15A, the support piece 5115 is provided with a through hole 5115a which is circular in a plan view and penetrates the support piece 5115 in the thickness direction. Further, the support piece 5113 is also provided with a through hole (not shown) which is circular in a plan view and penetrates the support piece 5113 in the thickness direction. Then, the shaft 5014 is fixed to the support pieces 5113 and 5115 in a state of being inserted into the through holes 5115a of the support pieces 5113 and 5115 to support the inner ring of the bearing 5012. Here, the outer ring of the bearing 5012 is rotatable around the central axis J511 of the shaft 5014.

The third site 5011c has side pieces 5112d and 5114d. The side pieces 5112d and 5114d extend in the + X direction from the edges of the side pieces 5112c and 5114c of the first portion 5011a on the + X direction side. Here, the second virtual plane VP52 that passes through the central portion of the tip portion of the side pieces 5112d and 5114d on the + X direction side in the Y-axis direction and is orthogonal to the swing axis J52 of the arm body 5011 is orthogonal to the swing axis J52. Moreover, it is arranged at a position shifted to the −Y direction side of the first virtual plane VP51 passing through the central portion of the second portion 5011b in the swing axis direction.

The support plate 5016 has a long plate shape, and through holes 5016a penetrating in the thickness direction are formed at both ends in the longitudinal direction and extend in the swing axis J52 direction of the arm body 5011. .. Then, as shown in FIGS. 16A and 16B, the two side pieces 5112d and 5114d each pass through the central portion in the direction of the swing axis J52 at the end opposite to the first portion 5011a side and swing. The second virtual plane VP 52 orthogonal to the moving axis J52 passes through the central portion of the two screws 5013 in the longitudinal direction of the support plate 5016, and the arm body 5021 described later with respect to the third virtual plane VP 53 orthogonal to the swing axis J52. It is located on the side opposite to the fifth part 5021b side of the above. That is, the second virtual plane VP52 that passes through the central portion in the direction of the swing axis J52 and is orthogonal to the swing axis J52 at the end opposite to the first portion 5011a side of each of the two side pieces 5112d and 5114d is supported. It is located on the −Y direction side of the third virtual plane VP53 that passes through the central portion of the two screws 5013 in the longitudinal direction of the plate 5016 and is orthogonal to the swing axis J52.

Each of the two screws 5013 is a valve contact portion that is fixed to the support plate 5016 in a state of being inserted into through holes 5016a provided at both ends in the longitudinal direction of the support plate 5016 and abuts on the valve.

As shown in FIGS. 15B and 15C, the arm body 5021 is a second arm body having a fourth part 5021a and a fifth part 5021b. The arm body 5021 is formed by pressing a single plate-shaped base material prepared by punching a metal plate such as a steel plate, similarly to the arm body 5011 described above. The fourth portion 5021a is swingably supported by a shaft inserted inside the shaft guide 5023. The fifth portion 5021b is located on the −X direction side with respect to the fourth portion 5021a. The fourth portion 5021a has a main piece 5211 which is a long third main piece and two side pieces 5212 and 5214. The side pieces 5212 and 5214 are third side pieces extending in the −Z direction from both end edges of the main piece 5211 in the Y-axis direction. Further, the side piece 5214 is provided with a protruding piece 5216 that projects in the −Y direction and fixes the coil spring 5025, which will be described later. Further, the tip portion 5217 on the + X direction side of the side piece 5214 projects toward the + X direction side from the protruding piece 5216. The side piece 5212 is provided with a notch portion 5212a having an arc shape in a plan view.

The fifth portion 5021b has support pieces 5213 and 5215 that support the extension bearing 5022 in the −X direction from the edge of the side pieces 5212 and 5214 on the −X direction side of the fourth portion 5021a, respectively. The support pieces 5213 and 5215 are provided with through holes (not shown) that are circular in a plan view and penetrate the support pieces 5213 and 5215 in the thickness direction, respectively. Then, the shaft 5024 is fixed to the support pieces 5213 and 5215 in a state of being inserted into the through holes of the support pieces 5213 and 5215, respectively, and supports the inner ring of the bearing 5022. Here, the outer ring of the bearing 5022 is rotatable around the central axis J512 of the shaft 5024.

The locking pin 5017 has a columnar shape and is provided in the arm body 5011 in a state of being inserted into a through hole 5114 g formed in the side pieces 5112c and 5114c of the arm body 5011. The locking pin 5017 may take either a first position for locking the arm body 5021 or a second position detached from the arm body 5021. A coil spring 5018 is arranged at a portion of the locking pin 5017 on the side piece 5112c side between the side pieces 5112c and 5114c. The end of the coil spring 5018 on the −Y direction side is in contact with the annular clip 5019 fixed to the locking pin 5017. The coil spring 5018 is a first urging member that urges the locking pin 5017 in the direction from the first position described above to the second position described above. Then, with the locking pin 5017 arranged at the first position described above, the locking pin 5017 comes into contact with a part of the inside of the notch 5212a of the side piece 5212.

The coil spring 5025 is fitted at the end of the shaft guide 5023 on the + Y direction side. One end 5025a of the coil spring 5025 in the stretching direction is in contact with the −Z direction side of the protruding piece 5216 of the fourth portion 5021a. The coil spring 5025 has an arm body 5021 so that a portion of the notch 5212a of the side piece 5212 that comes into contact with the locking pin 5017 is separated from the locking pin 5017 in a state where the locking pin 5017 is arranged at the first position described above. Is a second urging member that urges the arm body 5021 in a direction of rotation around the swing shaft J53.

As described above, the rocker arm 5001 according to the present embodiment is a second virtual plane that passes through the central portion of each of the two side pieces 5112d and 5114d in the swing axis J52 direction and is orthogonal to the swing axis J52. The VP 52 is located on the −Y direction side of the third virtual plane VP 53 that passes through the central portion of the two screws 5013 in the longitudinal direction of the support plate 5016 and is orthogonal to the swing axis J52. As a result, the rigidity of the support plate 5016 on the −Y direction side can be increased as compared with the rigidity of the support plate 5016 on the + Y direction side. Therefore, in the state where the locking pin 5017 is arranged in the first position described above, that is, in the state where the arm bodies 5011 and 5021 are connected, the screw 5013 is driven by the cam contacting the bearing 5022. Since the difference in the amount of displacement caused by the difference between the rigidity of the plate 5016 on the −Y direction side and the rigidity of the support plate 5016 on the + Y direction side can be reduced, it is caused by the inclination of the two screws 5013 due to the twist of the arm body 5011. The occurrence of malfunction of the rocker arm 5001 is suppressed.

Although the embodiments of the present invention have been described above, the present invention is not limited to the configuration of the above-described embodiments. For example, like the rocker arm 6001 shown in FIGS. 17A and 17B, the first portion 6011a oscillatingly supported by a shaft (not shown) and the first portion 6011a on the + X direction side. It may include an arm body 6011 having a second portion 6011b and a third portion 6011c located.

The rocker arm 6001 according to this modification includes a bearing 6012 and a screw 13 in addition to the arm body 6011. Further, the rocker arm 6001 includes a shaft 6014 fixed to the arm body 6011 and supporting the inner ring of the bearing 6012. Here, the rocker arm 6001 swings around a swing shaft J62 that coincides with the central axis of the shaft inserted through the through holes 6114a and 6112a provided in the first portion 6011a of the arm body 6011.

The third portion 6011c is arranged at a position where the central portion of the tip portion in the swing axis J62 direction is displaced toward the −Y direction. As a result, the central axis of the screw 13 fixed to the third portion 6011c is arranged at a position separated from the virtual plane VP61 by a distance W61. The first portion 6011a has a main piece 6111a and side pieces 6112c and 6114c. The side pieces 6112c and 6114c extend in the −Z direction from both end edges of the main piece 6111a in the Y-axis direction. The side pieces 6112c and 6114c each have through holes 6112a and 6114a and annular ribs 6112b and 6114b that surround the through holes 6112a and 6114a and project from the outer peripheral portions of the through holes 6112a and 6114a on the side facing each other. It is provided.

The second portion 6011b has support pieces 6113 and 6115 that support the bearing 6012 extending in the + X direction from the edges of the side pieces 6112c and 6114c on the + X direction, respectively. The support piece 6113 is provided with a through hole 6113a which is circular in a plan view and penetrates the support piece 6113 in the thickness direction. Further, the support piece 6115 is also provided with a through hole 6115a which is circular in a plan view and penetrates the support piece 6115 in the thickness direction. Then, the shaft 6014 is fixed to the support pieces 6113 and 6115 in a state of being inserted into the through holes 6113a and 6115a of the support pieces 6113 and 6115 to support the inner ring of the bearing 6012. Here, the outer ring of the bearing 6012 is rotatable around the central axis J61 of the shaft 6014.

The third portion 6011c has a main piece 6111b and side pieces 6112d and 6114d. The side pieces 6112d and 6114d extend in the −Z direction from both end edges of the main piece 6111b in the Y-axis direction. Further, a through hole 6111d that penetrates the main piece 6111b in the thickness direction is provided at the tip of the main piece 6111b. Further, on the −Z direction side of the tip of the main piece 6111b, an annular rib 6111c that surrounds the through hole 6111d and projects from the outer peripheral portion of the through hole 6111d toward the −Z direction along the thickness direction of the main piece 6111b. Is provided. The thickness of the side piece 6114d is smaller than the thickness of the tip portion 6112e of the side piece 6112d far from the virtual plane VP61. Further, the length of the side piece 6114d in the thickness direction of the main piece 6111b is longer than the length of the tip portion 6112e of the side piece 6112d in the thickness direction of the main piece 6111b.

With this configuration as well, the difference in the amount of displacement caused by the difference in rigidity between the two side pieces 6112d and 6114d can be reduced, so that the rocker arm 6001 malfunctions due to the inclination of the screw 13 due to the twist of the arm body 6011. Occurrence is suppressed.

In each embodiment, the configuration including the bearings 12, 2012, 3012, 4012, 4022, 5012, 5022, 6012 has been described, but the present invention is not limited to this, for example, the bearings 12, 2012, 3012, 4012, 4022, 5012, 5022. , 6012 may be provided with a slipper portion.

In the fourth and fifth embodiments, an example in which the coil springs 4025 and 5025 are fitted in the shaft guides 4023 and 5023 has been described, but the positions of the coil springs 4025 and 5025 are not limited to this. Further, in the fourth and fifth embodiments, an example in which the second urging member is the coil springs 4025 and 5025 has been described, but the second urging member is not limited to the coil spring, and is, for example, a leaf spring. There may be.

Hereinafter, embodiments and modifications of the present invention (including those described in the description; the same shall apply hereinafter) have been described, but the present invention is not limited thereto. The present invention includes a combination of embodiments and modifications as appropriate, and modifications thereof as appropriate.

The present invention is particularly suitable for a rocker arm used for a small engine such as a two-wheeled vehicle or a general-purpose engine.

1,2001,3001,4001,5001,6001: Rocker arm, 11,2011,3011,4011,4021,5011,5021,6011: Arm body, 11a, 2011a, 3011a, 4011a, 5011a, 6011a: First part, 11b , 2011b, 3011b, 4011b, 5011b, 6011b: Second part, 11c, 2011c, 3011c, 4011c, 5011c, 6011c: Third part, 12,2012,3012,4012,4022,5012,5022,6012: Bearing, 13 , 2013,3013,4013,5013: Screw, 14,200,2014,3014,4014,4024,5014,5024,6014: Shaft, 100: Valve, 111a,111b,2111a,2111b,3111,4016,4211,5111 , 5211,6111a, 6111b: Main piece, 111c, 112b, 114b, 2111c, 4016a, 6111c, 6112b, 6114b: Rib, 112c, 112d, 114c, 114d, 2112c, 2112d, 2114c, 2114d, 3112c, 3112d, 3114c, 3114d, 4112c, 4112d, 4114c, 4114d, 4212, 4214, 5112c, 5112d, 5114c, 5114d, 5212, 5214, 6112c, 6112d, 6114c, 6114d: Side pieces, 111d, 112a, 113a, 114a, 115a, 2111e, 2112a , 2113a, 2114a, 2115a, 3015a, 3016a, 3112a, 3114a, 3115a, 4016b, 4114a, 4114g, 4115a, 5015a, 5016a, 5023a, 5114a, 5114g, 5115a, 6111d, 6112a, 6113a, 6114a, 6115a: Through holes, 112e, 2112e, 4112e, 4217,5217,6112e: Tip, 113,115,2113,2115,3113,3115,4113,4115,4213,4215,5113,5115,5213,5215,6113,6115: Support piece, 2015,3015,4015,4023,5015,5023: Shaft guide, 3016,5016: Support plate, 4017,5017: Locking pin, 4018,4025,5018,5025: Coil spring, 4019,5019: Clip, 4 021a, 5021a: 4th part, 4021b, 5021b: 5th part, 4025a, 5025a: end part, 4212a, 5212a: notch part, 4216, 5216: protruding piece, C1: cam, J11, J21, J31, J61, J411 , J412, J511, J512: Central axis, J12, J22, J32, J42, J43, J52, J53, J62: Swing axis, VP11, VP21, VP41, VP61: Virtual plane, VP31, VP51: First virtual plane, VP32, VP52: 2nd virtual plane, VP33, VP53: 3rd virtual plane

In order to achieve the above object, the rocker arm according to the present invention
A rocker arm that is rocked and driven by a rotating cam.
The first portion swingably supported by the support member and the first direction side orthogonal to the swing axis of the first portion with respect to the first portion or the second direction opposite to the first direction side. A first arm body having a second portion located on the side and a third portion located on the second direction side with respect to the first portion.
A first cam contact portion provided at the second portion and in contact with the cam, and a first cam contact portion.
It is provided with two valve contact portions provided at the tip of the third portion and in contact with the valve.
The third portion is at least at a position shifted to one surface side of the first virtual plane that is orthogonal to the swing axis and passes through the central portion of the first cam contact portion in the swing axis direction. central portion is disposed in the shaft direction, has a first side piece of the two that out extending from the second direction side of the end edge of said first portion,
The two valve contact portions are provided in a state of being parallel to the swing axis direction at the tip portion of the third portion .

According to the present invention, malfunction of the occurrence of Russia Kkaamu is suppressed.

The arm body 11 is a first arm body having a first part 11a, a second part 11b, and a third part 11c. The arm body 11 is formed by pressing a single plate-shaped base material prepared by punching a metal plate such as a steel plate. As the steel plate, for example, hardened steel (for example, SCM415) can be adopted. The first portion 11a is swingably supported by the shaft 200, which is a support member. As shown in FIGS. 2A and 2B, the second portion 11b is on the first direction side orthogonal to the swing axis J12 of the first portion 11a with respect to the first portion 11a, that is, on the −X direction side. Located in. The third portion 11c is located on the second direction side opposite to the first direction side with respect to the first portion 11a, that is, on the + X direction side. Further, in the third portion 11c, the central portion of the tip portion in the swing axis J12 direction is orthogonal to the swing shaft J12, and the central portion of the second portion 11b in the swing axis J12 direction, that is, a virtual plane passing through the bearing 12. It is arranged on one side of the VP11, that is, at a position shifted in the −Y direction. As a result, the central axis of the screw 13 fixed to the third portion 11c is arranged at a position separated from the virtual plane VP11 by a distance W1. The first portion 11a has a main piece 111a and side pieces 112c and 114c. The main piece 111a is a second main piece continuous with the main piece 111b at the edge on the + X direction side. Side pieces 112c, 114c are one-way along the respective both end edges in the Y-axis direction of the main piece 111a in the thickness direction of the main piece 111a, i.e., that out extending in the -Z direction. The side pieces 112c and 114c each have an annular shape that surrounds the through holes 112a and 114a through which the shaft 200 is inserted and the through holes 112a and 114a and projects from the outer peripheral portions of the through holes 112a and 114a on the side facing each other. Ribs 112b and 114b are provided.

The arm body 2011 is a first arm body having a first part 2011a, a second part 2011b, and a third part 2011c. Similar to the arm main body 11 according to the first embodiment, the arm main body 2011 is formed by pressing a single plate-shaped base material prepared by punching a metal plate such as a steel plate. It is formed. The first portion 2011a is swingably supported by a shaft inserted inside the shaft guide 2015. The second portion 2011b is located on the −X direction side with respect to the first portion 2011a. The third portion 2011c is located on the + X direction side with respect to the first portion 2011a. Further, in the third portion 2011c, the central portion of the tip portion in the swing axis J22 direction is orthogonal to the swing shaft J22, and the central portion of the second portion 2011b in the swing axis J22 direction, that is, a virtual plane passing through the bearing 2012. It is arranged on one side of the VP21, that is, at a position deviated from the −Y direction side. The first portion 2011a has a main piece 2111a and side pieces 2112c and 2114c. The main piece 2111a is a second main piece that is continuous with the main piece 2111b at the edge on the + X direction side. Side pieces 2112c, 2114c is that out extending from the respective opposite ends in the Y-axis direction main piece 2111a the -Z direction. The side pieces 2112c and 2114c are each provided with through holes 2112a and 2114a through which the shaft guide 2015 is inserted.

(Embodiment 3)
The rocker arm according to the present embodiment has a long support plate extending in the swing axis direction of the first arm body and two valve contact portions provided at both ends in the longitudinal direction of the support plate and in contact with the valves. It differs from the first and second embodiments in that it includes a part. Here, the first arm body has a first portion that is swingably supported by a support member and a second portion that is located on the first direction side orthogonal to the swing axis of the first portion with respect to the first portion. And a third portion located on the second direction side opposite to the first direction side with respect to the first portion. The third portion of the first arm body has two side pieces extending from the above-mentioned end edge of the first portion of the first arm body on the second direction side, and at least the swing shaft of the tip portion. The central portion in the direction is orthogonal to the swing axis and is arranged at a position shifted to one surface side of the virtual plane passing through the central portion in the swing axis direction of the second portion described above. Further, a second virtual plane that passes through the central portion of each of the two side pieces on the side opposite to the first portion side in the swing axis direction and is orthogonal to the swing axis is the longitudinal direction of the support plate described above. It is located on the side opposite to the first virtual plane side with respect to the third virtual plane that passes through the central portion of the two valve contact portions and is orthogonal to the swing axis.

The third site 3011c has side pieces 3112d and 3114d, as shown in FIGS. 8B and 8C. Side pieces 3112d, 3114d are side piece 3112c of the first region 3011a, that out extending from each edge of the + X direction side of the 3114c the + X direction. Here, the second virtual plane VP32 that passes through the central portion of the tip portion of the side pieces 3112d and 3114d on the + X direction side in the Y-axis direction and is orthogonal to the swing axis J32 of the arm body 3011 is orthogonal to the swing axis J32. Moreover, it is arranged at a position shifted to one surface side of the first virtual plane VP31 passing through the central portion of the second portion 3011b in the swing axis direction, that is, to the −Y direction side.

As shown in FIGS. 11B and 11C, the arm main body 4021 is a second arm main body having a fourth portion 4021a and a fifth portion 4021b. The arm body 4021 is formed by pressing a single plate-shaped base material prepared by punching a metal plate such as a steel plate, similarly to the arm body 4011 described above. The fourth portion 4021a is swingably supported by a shaft inserted inside the shaft guide 4023. The fifth portion 4021b is located on the −X direction side with respect to the fourth portion 4021a. The fourth portion 4021a has a main piece 4211 which is a long third main piece, and two side pieces 4212 and 4214. Side pieces 4212,4214 are unidirectional along the respective both end edges in the Y-axis direction of the main piece 4211 in the thickness direction of the main piece 4211, that is, that out extending in the -Z direction. Further, the side piece 4214 is provided with a protruding piece 4216 that projects in the −Y direction and fixes the coil spring 4025, which will be described later. Further, the tip portion 4217 on the + X direction side of the side piece 4214 projects toward the + X direction side from the protruding piece 4216. The side piece 4212 is provided with a notch 4212a having an arc shape in a plan view.

As shown in FIGS. 15B and 15C, the arm body 5021 is a second arm body having a fourth part 5021a and a fifth part 5021b. The arm body 5021 is formed by pressing a single plate-shaped base material prepared by punching a metal plate such as a steel plate, similarly to the arm body 5011 described above. The fourth portion 5021a is swingably supported by a shaft inserted inside the shaft guide 5023. The fifth portion 5021b is located on the −X direction side with respect to the fourth portion 5021a. The fourth portion 5021a has a main piece 5211 which is a long third main piece and two side pieces 5212 and 5214. Side pieces 5212,5214 is that out extending from the respective opposite ends in the Y-axis direction main piece 5211 the -Z direction. Further, the side piece 5214 is provided with a protruding piece 5216 that projects in the −Y direction and fixes the coil spring 5025, which will be described later. Further, the tip portion 5217 on the + X direction side of the side piece 5214 projects toward the + X direction side from the protruding piece 5216. The side piece 5212 is provided with a notch portion 5212a having an arc shape in a plan view.

In order to achieve the above object, the rocker arm according to the present invention
A rocker arm that is rocked and driven by a rotating cam.
The first portion swingably supported by the support member and the first direction side orthogonal to the swing axis of the first portion with respect to the first portion or the second direction opposite to the first direction side. A first arm body having a second portion located on the side and a third portion located on the second direction side with respect to the first portion.
A first cam contact portion provided at the second portion and in contact with the cam, and a first cam contact portion.
It is provided with two valve contact portions provided at the tip of the third portion and in contact with the valve.
The third portion is at least at a position shifted to one surface side of the first virtual plane that is orthogonal to the swing axis and passes through the central portion of the first cam contact portion in the swing axis direction. A central portion in the direction of the drive axis is arranged, and has two first side pieces extending from the end edge of the first part on the second direction side.
Said two valve abutment, the al provided in a state in parallel to the oscillation axis direction and at the distal end of the third portion,
The third portion further comprises a first main piece extending from the second directional edge of the first portion.
The first side piece extends in one direction along the thickness direction of the first main piece from each of both end edges of the first main piece in the lateral direction.
The two valve contact portions are fixed in parallel in the swing axis direction at the tip portion of the first main piece.
The thickness of one of the ends of each of the two first side pieces opposite to the first part side, which is far from the first virtual plane, is thicker than the thickness of the other near the first virtual plane. Or, the length of one of the first main pieces in the thickness direction is longer than the length of the other first main piece in the thickness direction .

Claims (9)

A rocker arm that is rocked and driven by a rotating cam.
The first portion swingably supported by the support member and the first direction side orthogonal to the swing axis of the first portion with respect to the first portion or the second direction opposite to the first direction side. A first arm body having a second portion located on the side and a third portion located on the second direction side with respect to the first portion.
A first cam contact portion provided at the second portion and in contact with the cam, and a first cam contact portion.
A valve contact portion provided at the tip of the third portion and in contact with the valve is provided.
The third portion is at least at the center of the tip portion in the swing axis direction at a position orthogonal to the swing axis and deviated to one surface side of the virtual plane passing through the first cam contact portion in the swing axis direction. The thickness of the first main piece from each of the first main piece extending from the end edge of the first part on the second direction side and both end edges of the first main piece in the lateral direction. It has two first side pieces that extend in one direction along the direction,
The thickness of one of the ends of each of the two first side pieces opposite to the first part side, which is far from the virtual plane, is thicker than the thickness of the other near the virtual plane, or said. The length of one of the first main pieces in the thickness direction is longer than the length of the other first main piece in the thickness direction.
Rocker arm. There are two valve contact portions, which are fixed in parallel in the swing axis direction at the tip portion of the first main piece.
The rocker arm according to claim 1. Further equipped with a shaft guide that is cylindrical and the shaft is inserted inside,
The first portion includes a second main piece that is continuous with the first main piece at the edge on the second direction side, and the second main piece from both ends of the second main piece in the swing axis direction. Has two second side pieces, which extend in one direction along the thickness direction of
A through hole is formed in each of the two second side pieces to which the shaft guide is fixed.
The rocker arm according to claim 1 or 2. The first portion includes a second main piece that is continuous with the first main piece at the edge on the second direction side, and the second main piece from both ends of the second main piece in the swing axis direction. Has two second side pieces, which extend in one direction along the thickness direction of
Each of the two second side pieces is provided with a through hole through which the shaft is inserted and an annular rib that surrounds the through hole and projects from the outer peripheral portion of the through hole on the side facing each other. Yes,
The rocker arm according to claim 1 or 2. A rocker arm that is rocked and driven by a rotating cam.
The first portion swingably supported by the support member and the first direction side orthogonal to the swing axis of the first portion with respect to the first portion or the second direction opposite to the first direction side. A first arm body having a second portion located on the side and a third portion located on the second direction side with respect to the first portion.
A first cam contact portion provided at the second portion and in contact with the cam, and a first cam contact portion.
A long support plate provided at the tip of the third portion and extending in the swing axis direction, and
It is provided with two valve contact portions provided in parallel in the longitudinal direction of the support plate and in contact with the valve.
The third portion is located at a position orthogonal to the swing axis and offset to one surface side of the first virtual plane passing through the first cam contact portion in the swing axis direction, at least in the swing axis direction of the tip portion. Is arranged and has two third side pieces extending from the second directional edge of the first part.
The second virtual plane that passes through the central portion of each of the two third side pieces on the side opposite to the first part side in the swing axis direction and is orthogonal to the swing axis is the support plate. It is located on the side opposite to the first virtual plane side with respect to the third virtual plane that passes through the central portion of the two valve contact portions in the longitudinal direction and is orthogonal to the swing axis.
Rocker arm. A rocker arm that is rocked and driven by two rotating cams.
The first portion swingably supported by the first support member and the first portion orthogonal to the swing axis of the first portion with respect to the first portion or the first portion opposite to the first direction side. A first arm body having a second portion located on the two-direction side and a third portion located on the second direction side with respect to the first portion.
A fourth portion that is swingably supported by a second support member, and a second portion that is adjacent to the second portion in the swing axis direction on the first direction side or the second direction side with respect to the fourth portion. A second arm body having 5 parts,
A first cam contact portion provided at the second portion and in contact with one of the two cams, and a first cam contact portion.
A second cam contact portion provided at the fifth portion and in contact with the other of the two cams,
A valve contact portion provided at the tip of the third portion and abutting the valve, and a valve contact portion.
Further provided with a locking pin provided on the first arm body and capable of taking either a first position for locking the second arm body and a second position detached from the second arm body.
The third portion is the thickness of the first main piece extending from the end edge of the first portion on the second direction side and the thickness of the first main piece from both end edges of the first main piece in the lateral direction. It has two first side pieces that extend in one direction along the longitudinal direction.
The fourth portion is formed from a long third main piece and both end edges of the third main piece in the swing axis direction of the fourth portion in one direction along the thickness direction of the third main piece. Has two third side pieces that extend,
The thickness of one of the ends of each of the two first side pieces opposite to the first part side, which is far from the fifth part, is thicker than the thickness of the other near the fifth part, or The length of one of the first main pieces in the thickness direction is longer than the length of the other first main piece in the thickness direction.
Rocker arm. A rocker arm that is rocked and driven by two rotating cams.
The first portion swingably supported by the first support member and the first portion orthogonal to the swing axis of the first portion with respect to the first portion or the first portion opposite to the first direction side. A first arm body having a second portion located on the two-direction side and a third portion located on the second direction side with respect to the first portion.
A fourth portion that is swingably supported by a second support member, and a second portion that is adjacent to the second portion in the swing axis direction on the first direction side or the second direction side with respect to the fourth portion. A second arm body having 5 parts,
A first cam contact portion provided at the second portion and in contact with one of the two cams, and a first cam contact portion.
A second cam contact portion provided at the fifth portion and in contact with the other of the two cams,
A long support plate provided at the tip of the third portion and extending in the swing axis direction, and
Two valve contact portions provided in parallel in the longitudinal direction of the support plate and in contact with the valve,
Further provided with a locking pin provided on the first arm body and capable of taking either a first position for locking the second arm body and a second position detached from the second arm body.
The third portion has two third side pieces extending from the second directional edge of the first portion.
The second virtual plane that passes through the central portion of each of the two third side pieces on the side opposite to the first part side in the swing axis direction and is orthogonal to the swing axis is the support plate. It is located on the side opposite to the fifth portion with respect to the third virtual plane that passes through the central portion of the two valve contact portions in the longitudinal direction and is orthogonal to the swing axis.
Rocker arm. The locking pin is cylindrical and has a columnar shape.
One of the two third side pieces on the first arm body side has a plan-view arc shape, and the locking pin is locked to a part of the inside in a state where the locking pin is arranged at the first position. There is a notch for the pin to contact,
The rocker arm according to claim 6 or 7. A first urging member for urging the locking pin in a direction from the first position to the second position is further provided.
The rocker arm according to any one of claims 6 to 8.

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