JP6865083B2 - Rocker arm support structure - Google Patents

Description

The present invention relates to a rocker arm support structure in an internal combustion engine.

Some rocker arm support structures in conventional internal combustion engines are provided with a mechanical adjustment structure for adjusting the tappet clearance. As this mechanical adjustment structure, for example, in Patent Document 1, an eccentric rocker arm shaft is provided inside a roller bearing that supports the rocker arm, and the rocker arm shaft is urged in the rotational direction by a torsion spring. A technique that makes it possible to adjust the tappet clearance by pressing the rocker arm against the camshaft is described (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 63-230916

However, in the above-mentioned prior art, a stopper member provided on the side of the rocker arm is used to regulate the swing rotation position in the pressing direction against the camshaft. Therefore, it is necessary to secure a rotation region of the stopper member, which has been an obstacle to miniaturization.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a rocker arm support structure having a compact structure and adjustable tappet clearance.

In order to achieve the above object, the invention according to claim 1 is
A rocker arm that drives a valve of an internal combustion engine by sliding and swinging with the cam surface as the camshaft rotates.
A rocker arm shaft that swingably supports the rocker arm,
A shaft holder that rotatably supports the rocker arm shaft and
It is a rocker arm support structure equipped with
The rocker arm shaft has an arm support portion penetrating the rocker arm and a holder contact portion supported by the shaft holder, and is supported by a drive mechanism so as to be slidable in the axial direction.
The support portion central axis of the arm support portion is provided eccentrically with the central axis of the holder contact portion.
The rocker arm shaft has a groove portion extending at an inclined portion with respect to the central axis at the holder contact portion.
The shaft holder has a guide member that is slidably fitted into the groove.
When the rocker arm shaft slides in the axial direction by the drive mechanism, the rocker arm shaft rotates due to the sliding of the guide member and the groove portion, and the rocker arm and the rocker arm rotate with the rotation of the arm support portion. The tappet clearance with the cam surface is adjusted.
Further, in order to achieve the above object, the invention according to claim 2 is
A rocker arm that drives a valve of an internal combustion engine by sliding and swinging with the cam surface as the camshaft rotates.
A rocker arm shaft that swingably supports the rocker arm,
A rocker arm support structure including a shaft holder that rotatably supports the rocker arm shaft.
The rocker arm shaft has an arm support portion penetrating the rocker arm and a holder contact portion supported by the shaft holder, and is supported by a drive mechanism so as to be slidable in the axial direction.
The support portion central axis of the arm support portion is provided eccentrically with the central axis of the holder contact portion.
The rocker arm shaft has a groove portion extending at an inclined portion with respect to the central axis at the holder contact portion.
The shaft holder has a guide member that is slidably fitted into the groove.
When the rocker arm shaft slides in the axial direction by the drive mechanism, the rocker arm shaft rotates due to the sliding of the guide member and the groove portion, and the rocker arm and the rocker arm rotate with the rotation of the arm support portion. The tappet clearance with the cam surface is adjusted,
The drive mechanism is housed in the shaft holder.

The invention according to claim 3 is in addition to the configuration according to claim 1 or 2.
The rocker arm shaft has a drive mechanism contact portion that contacts the drive mechanism on the side opposite to the holder contact portion with the arm support portion interposed therebetween.
The rocker arm shaft is characterized in that the outer diameter is increased from the drive mechanism contact portion toward the holder contact portion.

The invention according to claim 4 has a configuration according to any one of claims 1 to 3, in addition to the configuration described in any one of claims 1 to 3.
The shaft holder has a first shaft holder portion provided with the guide member and a second shaft holder portion provided with the drive mechanism while holding the holder contact portion.
The drive mechanism is an elastic member that urges the rocker arm shaft toward the first shaft holder portion.

The invention according to claim 5 has a configuration according to any one of claims 1 to 4 , in addition to the configuration described in any one of claims 1 to 4.
The shaft holder is characterized in that it is configured by fastening an upper holder portion that constitutes the upper part of the shaft holder to a lower holder portion that constitutes the lower portion of the shaft holder.

The invention according to claim 6 has a configuration according to any one of claims 1 to 5 , in addition to the configuration described in any one of claims 1 to 5.
The shaft holder has a through hole into which the guide member can be inserted from the outside of the shaft holder.
The rocker arm shafts are arranged side by side on the intake side and the exhaust side in parallel with the camshaft.
Each of the guide members provided on both the intake side and the exhaust side is locked by one locking member attached to the shaft holder.

According to the inventions of claims 1 and 2 , when the rocker arm shaft slides in the axial direction by the drive mechanism, the rocker arm shaft rotates due to the sliding of the guide member and the groove portion, and the eccentric arm support portion rotates. The tappet clearance between the rocker arm and the cam surface is adjusted accordingly. As a result, the tappet clearance between the rocker arm and the cam surface can be adjusted in a compact configuration. Further, the swing limit in the vertical direction of the rocker arm can be easily set depending on the size and shape of the groove portion.

According to the invention of claim 3 , the rocker arm shaft is formed so that the outer diameter increases from the drive mechanism contact portion on one end side toward the holder contact portion on the other end side. When incorporating, it cannot be installed in the wrong direction, and incorrect assembly can be prevented.

According to the invention of claim 4 , since the drive mechanism is an elastic member that urges the rocker arm shaft toward the first shaft holder portion, the drive mechanism can be easily configured. Further, since the elastic member can be installed in the second shaft holder portion, the drive mechanism is not exposed to the outside of the shaft holder, and space can be saved.

According to the invention of claim 5 , since the shaft holder is configured by fastening the upper holder portion constituting the upper portion to the lower holder portion constituting the lower portion of the shaft holder, when the rocker arm shaft is incorporated. The shape of the rocker arm shaft can be freely set, and the assembly of the rocker arm shaft can be improved.

According to the invention of claim 6 , since the shaft holder has a through hole into which the guide member can be inserted from the outside of the shaft holder, the guide member can be attached from the outside of the shaft holder and the assembling property is good. Further, since the guide members provided on the intake side and the exhaust side are locked by one locking member attached to the shaft holder, both the intake side and the exhaust side can be fixed at the same time. The number of parts can be reduced.

It is a schematic block diagram which shows disassembled the main part of the rocker arm support structure which concerns on 1st Embodiment of this invention. It is a schematic plan view of the rocker arm support structure seen from above with the upper holder part removed. FIG. 2 is a cross-sectional view taken along the line BB of FIG. 2 in a state where the rocker arm shaft and the shaft holder are disassembled. FIG. 2 is a cross-sectional view taken along the line BB of FIG. 2 in a state in which the rocker arm shaft and the shaft holder according to the modified example are disassembled. (A) is a side view of the rocker arm shaft viewed from the longitudinal direction, (b) is a plan view of the rocker arm shaft, and (c) is a perspective view of a holder contact portion of the rocker arm shaft. It is a top view of the shaft holder. It is sectional drawing which follows the AA line of FIG. It is a schematic perspective view which shows the fitting state of the groove portion formed in the rocker arm shaft of the rocker arm support structure shown in FIG. 1 and a guide member. It is a schematic perspective view which shows the fitting state of the groove portion formed in the rocker arm shaft and the guide member in the rocker arm support structure which concerns on 2nd Embodiment of this invention. It is sectional drawing of the main part of the rocker arm support structure which concerns on 3rd Embodiment of this invention. 9 is a cross-sectional view taken along the axis of the rocker arm shaft in a state where the rocker arm shaft and the shaft holder in the rocker arm support structure of FIG. 9 are disassembled.

Hereinafter, the rocker arm support structure of each embodiment of the present invention will be described with reference to FIGS. 1 to 10.

<First Embodiment>
First, the rocker arm support structure of the first embodiment will be described with reference to FIGS. 1 to 7.
As shown in FIGS. 1 and 2, the cylinder head 2 of the internal combustion engine is provided with an intake valve valve 11 and an exhaust valve 12, and a rocker arm 15 for driving the intake valve valve 11 and the exhaust valve 12 is a cylinder. It is provided on the upper part of the head 2. As the camshaft 13 rotates, one end side 15a of the rocker arm 15 slides with the cam surface 14 and swings, so that the other end side 15b swings. The swing of the other end side 15b presses the upper ends of the stems of the intake valve valve 11 and the exhaust valve 12, so that the rocker arm 15 drives the valve. Further, the rocker arm 15 is provided with a rotatable roller 15ar on one end side 15a that slides on the cam surface 14, while an adjuster 15ba that can adjust the clearance with the upper end of the stem is provided on the other end side 15b. It is provided.

The rocker arm 15 is swingably supported by a rocker arm shaft 16 penetrating the rocker arm 15. Both ends of the rocker arm shaft 16 are rotatably and slidably supported by a shaft holder 10 fixed on the cylinder head 2. The shaft holder 10 is attached to the upper part of the cylinder head 2, and the upper part of the shaft holder 10 is formed on the lower holder portion 10d which is attached to the upper part of the cylinder head 2 and which forms the lower part of the shaft holder 10 by the fastening bolt 50 which inserts the bolt hole 10i. It is configured by fastening the holder portion 10u.

With reference to FIG. 5, the shaft holder 10 includes a first shaft holder portion 10a for holding one end side of the rocker arm shaft 16 (right side in FIGS. 2 and 5) and the other end side of the rocker arm shaft 16 (right side in FIGS. 2 and 5). The second shaft holder portion 10c holding the left side in FIGS. 2 and 5) is connected by a pair of holder connecting portions 10b. By fastening the upper holder portion 10u and the lower holder portion 10d, mounting holes 10g in which the rocker arm shaft 16 is arranged are formed in the first shaft holder portion 10a and the second shaft holder portion 10c. The holder connecting portion 10b connects the first shaft holder portion 10a and the second shaft holder portion 10c below the rocker arm shaft 16 arranged in the mounting hole 10g.

As shown in FIG. 2, the rocker arm shaft 16 has an arm support portion 16b at the center of the shaft penetrating and holding the rocker arm 15. Further, on one end side of the shaft (on the right side in FIG. 2), a large-diameter holder contact portion 16a is rotatably and slidably supported by the first shaft holder portion 10a of the shaft holder 10 and has a groove portion 16g described later. On the other end side of the shaft, the elastic member contact portion 16c is rotatably and slidably supported by the second shaft holder portion 10c of the shaft holder 10 and is in contact with the elastic member 18 as a drive mechanism described later. Has. The rocker arm shaft 16 is arranged in parallel with the camshaft 13 on the intake side 2i and the exhaust side 2e.

The rocker arm shaft 16 is formed so that the holder contact portion 16a, the arm support portion 16b, and the elastic member contact portion 16c have an outer diameter that increases from the elastic member contact portion 16c toward the holder contact portion 16a. There is. That is, the holder contact portion 16a has the largest diameter, the arm support portion 16b has a smaller diameter than the holder contact portion 16a, and the elastic member contact portion 16c has a smaller diameter than the arm support portion 16b. A shaft tip portion 16f having a diameter smaller than that of the elastic member contact portion 16c is formed on the tip side (left side in the drawing) of the elastic member contact portion 16c. It may be provided, and it may not be particularly provided.

At the elastic member contact portion 16c, the other end portion of the elastic member 18 whose one end portion is supported by the inner wall surface 10iw of the second shaft holder portion 10c is arranged. Therefore, the elastic member 18 is configured to always urge the rocker arm shaft 16 toward the holder contact portion 16a.

The holder contact portion 16a is formed with a groove portion 16g that extends at an angle with respect to the central axis SC of the holder contact portion 16a (which is also the central axis SC of the rocker arm shaft 16). A pin-shaped guide member 20 provided in the first shaft holder portion 10a of the shaft holder 10 is fitted into the groove portion 16g.

As shown in FIGS. 2 and 3A, the guide member 20 has a circular cross section and has a small diameter portion 20b formed at a small diameter with respect to the main body portion 20a fitted into the groove portion 16g at the upper end portion.

As shown in FIGS. 4B and 4C, the groove portion 16g is composed of an upper groove portion 16gf formed on the upper surface of the hollow holder contact portion 16a and a lower groove portion 16gb formed on the lower surface, and is a flat surface. The upper groove portion 16 gf and the lower groove portion 16 gb are configured to intersect with each other visually. As described above, the groove portion 16g has a structure in which the upper groove portion 16gf and the lower groove portion 16gb intersect with each other, so that when the rocker arm shaft 16 slides in the axial direction thereof, the guide member 20 is fitted into the groove portion 16g. The groove portion 16g is guided along the groove portion 16g, and the rocker arm shaft 16 rotates.

The first shaft holder portion 10a of the shaft holder 10 is formed with a through hole 10h into which the guide member 20 can be inserted from the outside of the shaft holder 10 (see FIG. 3A). As shown in FIG. 5, the through holes 10h are arranged side by side so as to correspond to the rocker arm shafts 16 on the intake side 2i and the exhaust side 2e arranged side by side.

When incorporating the rocker arm shaft 16, for example, the rocker arm shaft 16 is incorporated into the lower holder portion 10d before fixing the upper holder portion 10u to the lower holder portion 10d of the shaft holder 10. The rocker arm shaft 16 is urged by an elastic member 18 arranged between the inner wall surface 10iw of the second shaft holder portion 10c and the rocker arm shaft 16 in a direction of protruding from the mounting hole 10g, so that the guide member 20 By inserting the temporary fixing pin 26 into the temporary fixing hole 26h located behind the through hole 10h before inserting the rocker arm shaft 16, the rocker arm shaft 16 can be temporarily fixed so as not to pop out (see FIG. 3A).

After fixing the upper holder portion 10u to the lower holder portion 10d of the shaft holder 10, the guide member 20 is inserted so as to penetrate the groove portion 16g from the through hole 10h, and as shown in FIG. 6, the small diameter portion from the shaft holder 10 It is mounted with the 20b protruding. The guide member 20 is positioned via one locking member 21 attached to the upper holder portion 10u of the shaft holder 10.

As shown in FIG. 7, the locking member 21 is a plate-shaped member, and locking portions 21k for locking the guide member 20 are cut out at both ends in the longitudinal direction. Further, the locking member 21 has two mounting holes 21h into which the fixing screws 22 are inserted, and is fixed to the upper holder portion 10u of the shaft holder 10 by the fixing screws 22.

Therefore, the two guide members 20 inserted from the outside of the shaft holder 10 are fitted into the groove portion 16g by locking the small diameter portion 20b by the locking portions 21k at both ends of the locking member 21. It is fixed to the holder 10.

In the rocker arm support structure configured in this way, the rocker arm shaft 16 is always urged toward the holder contact portion 16a by the urging force of the elastic member 18. Then, the rocker arm shaft 16 is given a rotational force by guiding the groove portion 16g by the guide member 20. As shown in FIGS. 1 and 4B, in the arm support portion 16b of the rocker arm shaft 16, the support portion central axis AC, which is the central axis thereof, is the central axis SC (rocker arm shaft 16) of the holder contact portion 16a. When the rocker arm shaft 16 rotates, the rocker arm 15 supported by the arm support portion 16b can be moved in the vertical direction as the arm support portion 16b rotates. it can. As a result, the tappet clearance between the one end side 15a of the rocker arm 15 and the cam surface 14 is adjusted.

As described above, in the present embodiment, when the rocker arm shaft 16 slides in the axial direction due to the urging force of the elastic member 18, the rocker arm shaft 16 rotates due to the sliding of the guide member 20 and the groove portion 16 g, resulting in eccentricity. The tappet clearance between the rocker arm 15 and the cam surface 14 is adjusted with the rotation of the arm support portion 16b. As a result, the tappet clearance between the rocker arm 15 and the cam surface 14 can be adjusted in a compact configuration. Further, the swing limit of the rocker arm 15 in the vertical direction can be easily set depending on the size and shape of the groove portion 16g.

Further, in the present embodiment, the rocker arm shaft 16 is formed so that the outer diameter increases from the elastic member contact portion 16c on one end side toward the holder contact portion 16a on the other end side. When assembling the shaft 16, it cannot be mounted in the wrong direction, and erroneous assembly can be prevented.

Further, in the present embodiment, since the drive mechanism is the elastic member 18 that urges the rocker arm shaft 16 toward the first shaft holder portion 10a, the drive mechanism can be easily configured. Further, since the elastic member 18 can be installed in the second shaft holder portion 10c, the elastic member 18 is not exposed to the outside of the shaft holder 10 and space can be saved.

Further, in the present embodiment, the shaft holder 10 is configured by fastening the upper holder portion 10u that constitutes the upper part of the shaft holder 10 to the lower holder portion 10d that constitutes the lower portion of the shaft holder 10, and thus is a rocker. There are no restrictions on the shape of the shaft when the arm shaft 16 is incorporated, the shape of the rocker arm shaft 16 can be freely set, and the assembly of the rocker arm shaft 16 can be improved.

As shown in the modified example of FIG. 3B, the shaft holder 10 may be integrally formed with the lower holder portion 10d and the upper holder portion 10u without being disassembled. Even when the shaft holder 10 is integrally formed, the rocker arm shaft 16 can be appropriately arranged in the shaft holder 10 by inserting the rocker arm shaft 16 into the mounting hole 10g from the side. By integrally forming the shaft holder 10 in this way, not only the fastening bolt 50 can be eliminated, but also the fastening work of the lower holder portion 10d and the upper holder portion 10u can be reduced.

Further, in the present embodiment, since the shaft holder 10 has a through hole 10h into which the guide member 20 can be inserted from the outside of the shaft holder 10, the guide member 20 can be attached from the outside of the shaft holder 10 and the assemblability is improved. Good. Further, since the two guide members 20 provided on the intake side 2i and the exhaust side 2e are locked by one locking member 21 attached to the shaft holder 10, both the intake side 2i and the exhaust side 2e Can be fixed at the same time, and the number of parts can be reduced.

<Second Embodiment>
Hereinafter, the second embodiment of the present invention will be described with reference to FIG. FIG. 8 is a schematic perspective view showing a fitted state between the groove portion of the rocker arm shaft and the guide member in the rocker arm support structure according to the second embodiment of the present invention. Further, in FIG. 8, components common to the first embodiment are designated by the same reference numerals, and description thereof will be omitted.

The rocker arm support structure of the present embodiment differs from the first embodiment in that the guide member 20 does not penetrate the rocker arm shaft 16 as shown in FIG. That is, the groove portion 16g is formed on the outer peripheral surface that does not penetrate the rocker arm shaft 16, and the guide member 20 is fitted into the groove portion 16g.

<Third Embodiment>
Hereinafter, the third embodiment of the present invention will be described with reference to FIGS. 9 and 10. 9 is a cross-sectional view of a main part of the rocker arm support structure according to the third embodiment of the present invention, and FIG. 10 is a rocker in a state where the rocker arm shaft and the shaft holder in the rocker arm support structure of FIG. 9 are disassembled. It is sectional drawing along the axis of the arm shaft. Further, in FIGS. 9 and 10, components common to the first embodiment are designated by the same reference numerals and description thereof will be omitted.

The difference between the rocker arm support structure of the present embodiment and the first embodiment is that, as shown in FIGS. 9 and 10, in the rocker arm shaft 16, the outside of the elastic member contact portion 16c with which the elastic member 18 abuts. The point is that the diameter is the same as the outer diameter of the holder contact portion 16a. Further, since the outer diameter of the elastic member contact portion 16c is configured to be the same as the outer diameter of the holder contact portion 16a, the shaft holder 10 has a second hole diameter d1 of the mounting hole 10g of the first shaft holder portion 10a. It has the same dimensions as the hole diameter d1 of the mounting hole 10g of the shaft holder portion 10c.

By making the outer diameter of the elastic member contact portion 16c and the outer diameter of the holder contact portion 16a the same, the shapes of the rocker arm shaft 16 and the shaft holder 10 can be simplified and the number of processing steps can be reduced. ..

Although each embodiment of the present invention has been described above, the present invention is not limited to this, and can be changed as appropriate. For example, in the above embodiment, the structure uses the elastic member 18 as the drive mechanism, but the structure is not limited to this, and for example, an actuator or the like may be used.

Further, in the above embodiment, the locking member 21 is held so that the locking portions 21k cut out at both ends thereof hook the main body portion 20a of the guide member 20, but the locking member 21 is not limited to this and is a through hole. The locking portion 21k may hold the main body portion 20a of the guide member 20.

Further, in the above embodiment, the guide member 20 is attached to the shaft holder 10, but the present invention is not limited to this, and the shaft holder 10 and the guide member 20 are integrally formed. It may be.

2i Intake side 2e Exhaust side 10 Shaft holder 10a First shaft holder part 10c Second shaft holder part 10d Lower holder part 10u Upper holder part 10h Through hole 13 Camshaft 14 Cam surface 15 Rocker arm 16 Rocker arm shaft 16a Holder contact part 16b Arm support 16c Elastic member contact (drive mechanism contact)
16g groove 18 elastic member (drive mechanism)
20 Guide member 21 Locking member AC Support center axis SC Center axis

Claims (6)

A rocker arm (15) that drives a valve of an internal combustion engine by sliding and swinging with a cam surface (14) as the camshaft (13) rotates.
A rocker arm shaft (16) that swingably supports the rocker arm (15),
A rocker arm support structure including a shaft holder (10) that rotatably supports the rocker arm shaft (16).
The rocker arm shaft (16) has an arm support portion (16b) penetrating the rocker arm (15) and a holder contact portion (16a) supported by the shaft holder (10), and has a drive mechanism (18). ) Is supported so that it can slide in the axial direction.
The support portion central axis (AC) of the arm support portion (16b) is provided eccentrically with the central axis (SC) of the holder contact portion (16a).
The rocker arm shaft (16) has a groove portion (16 g) at the holder contact portion (16a) that extends at an angle with respect to the central axis (SC).
The shaft holder (10) has a guide member (20) that is slidably fitted into the groove portion (16 g).
When the rocker arm shaft (16) is slid in the axial direction by the drive mechanism, the rocker arm shaft (16) is rotated by sliding the guide member (20) and the groove portion (16 g), and the rocker arm shaft (16) is rotated. A rocker arm support structure characterized in that the tappet clearance between the rocker arm (15) and the cam surface (14) is adjusted as the arm support portion (16b) rotates. A rocker arm (15) that drives a valve of an internal combustion engine by sliding and swinging with a cam surface (14) as the camshaft (13) rotates.
A rocker arm shaft (16) that swingably supports the rocker arm (15),
A rocker arm support structure including a shaft holder (10) that rotatably supports the rocker arm shaft (16).
The rocker arm shaft (16) has an arm support portion (16b) penetrating the rocker arm (15) and a holder contact portion (16a) supported by the shaft holder (10), and has a drive mechanism (18). ) Is supported so that it can slide in the axial direction.
The support portion central axis (AC) of the arm support portion (16b) is provided eccentrically with the central axis (SC) of the holder contact portion (16a).
The rocker arm shaft (16) has a groove portion (16 g) at the holder contact portion (16a) that extends at an angle with respect to the central axis (SC).
The shaft holder (10) has a guide member (20) that is slidably fitted into the groove portion (16 g).
When the rocker arm shaft (16) slides in the axial direction by the drive mechanism, the guide member (20) and the groove portion (16 g) slide to rotate the rocker arm shaft (16), and the rocker arm shaft (16) rotates. The tappet clearance between the rocker arm (15) and the cam surface (14) is adjusted as the arm support portion (16b) rotates.
A rocker arm support structure characterized in that the drive mechanism (18) is housed in the shaft holder (10). The rocker arm shaft (16) has a drive mechanism contact portion (16c) that contacts the drive mechanism on the side opposite to the holder contact portion (16a) with the arm support portion (16b) interposed therebetween.
Claim 1 is characterized in that the rocker arm shaft (16) is formed so that the outer diameter increases from the drive mechanism contact portion (16c) toward the holder contact portion (16a). Or the rocker arm support structure according to 2. The shaft holder (10) holds the holder contact portion (16a) and is provided with the guide member (20), the first shaft holder portion (10a), and the second shaft provided with the drive mechanism. It has a holder part (10c) and
Any one of claims 1 to 3, wherein the drive mechanism is an elastic member (18) that urges the rocker arm shaft (16) toward the first shaft holder portion (10a). The rocker arm support structure described in the section. The shaft holder (10) is configured by fastening an upper holder portion (10u) that constitutes the upper portion of the shaft holder (10) to a lower holder portion (10d) that constitutes the lower portion of the shaft holder (10). The rocker arm support structure according to any one of claims 1 to 4, wherein the rocker arm is supported. The shaft holder (10) has a through hole (10h) into which the guide member (20) can be inserted from the outside of the shaft holder (10).
The rocker arm shaft (16) is arranged side by side on the intake side (2i) and the exhaust side (2e) in parallel with the cam shaft (13).
The guide members (20) provided on both the intake side (2i) and the exhaust side (2e) are locked by one locking member (21) attached to the shaft holder (10). The rocker arm support structure according to any one of claims 1 to 5, wherein the rocker arm support structure is provided.

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