JP2019152157A - Rocker arm structure, rocker arm unit and clip - Google Patents

Abstract

To provide a rocker arm structure capable of preventing a rocker arm from falling down.SOLUTION: A rocker arm structure comprises a rocker arm 10, and a lash adjuster 40 and a clip 60 as support members. The clip 60 includes: a first plate part 61 abutted to an outer surface 22 of a receiving part 14 of the rocker arm 10; a second plate part 62 including a pair of arm parts 75; and a connection part 63 connecting the first plate part 61 and the second plate part 62. The pair of arm parts 75 includes an inclined regulation part 73 which is expanded in a recessed shape in a direction away from the receiving part 14. The inclined regulation part 73 of at least one of the arm parts 75 is abutted to an outer surface of the lash adjuster 40 when the rocker arm 10 is inclined in a direction across a rocking direction in valve opening/closing with a top portion 43 defined as a fulcrum.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a rocker arm structure including a rocker arm, a support member, and a clip, a rocker arm unit including the rocker arm and the clip, and a clip.

The rocker arm unit described in Patent Document 1 includes a rocker arm, a support member (lash adjuster) that supports the rocker arm, and a connecting member that connects the rocker arm and the support member. The rocker arm has a valve contact portion that contacts one end of the valve and a support member contact portion that contacts one end of the support member, and swings about one end of the support member as a fulcrum to open and close the valve. It is like that.
The connecting member includes a pressing portion that contacts the hemispherical receiving portion of the support member, a base portion that can be locked in a mounting groove that is recessed in the outer peripheral surface of the support member, and a connecting portion that connects the base portion and the pressing portion. .

Japanese Patent Application Laid-Open No. 2018-17122

  In the above case, the rocker arm and the support member are integrally connected via the connection member by locking the base portion of the connection member in the mounting groove of the support member. In addition, when the rocker arm is tilted in the direction crossing the swinging direction when opening and closing the valve with one end of the support member as a fulcrum, the rocker arm can be prevented from falling down by contacting the groove surface of the mounting groove. It has become possible.

  However, since the mounting groove is provided in the support member, the cost is increased, and there is a problem that the member cannot be shared. In view of this, it has been considered to omit the mounting groove from the support member and to eliminate the connecting member. However, if the connecting member is abolished, it is impossible to prevent the rocker arm from falling sideways. Therefore, some means for securing this is required.

  The present invention has been completed based on the above circumstances, and an object thereof is to provide a rocker arm structure, a rocker arm unit, and a clip that can prevent a rocker arm from falling sideways.

  The rocker arm structure of the present invention includes a support member having a top portion, a rocker arm having a receiving portion for receiving the top portion, and a clip disposed across the rocker arm and the support member, and the hemispheric outer surface of the top portion is A valve is opened and closed by sliding in contact with the inner surface of the hemisphere of the receiving portion, and the rocker arm swinging about the top portion as a fulcrum, and the clip has a first plate portion that contacts the outer surface of the receiving portion; A second plate portion having a pair of arm portions disposed opposite to each other on both sides of the support member; and a connecting portion connecting the first plate portion and the second plate portion; The receiving portion is sandwiched between one plate portion and the second plate portion, and the pair of arm portions bulge in a concave shape in a direction away from the receiving portion, and the rocker arm serves as a valve with the top portion as a fulcrum. Open When tilted in a direction intersecting the swinging direction of the time, having characterized in that at least one has a tilting restriction portion which abuts the outer surface of the support member.

  When the rocker arm tilts with the top of the support member as a fulcrum in a direction crossing the swinging direction when opening and closing the valve, at least one of the pair of arm portions abuts against the outer surface of the support member, and the rocker arm tilts. Is regulated. Therefore, it is possible to prevent the rocker arm from falling sideways.

  If it is attempted to prevent the rocker arm from falling sideways when there is no clip, a large lap area where the receiving portion overlaps the top portion must be secured, resulting in a difficulty in designing the rocker arm. In that respect, there is a clip as described above, the receiving portion is sandwiched between the first plate portion and the second plate portion of the clip, and the pair of arm portions of the second plate portion are recessed in a direction away from the receiving portion. If it has the structure which has the inclination control part which bulges in, it can be ensured large apparently by the part which the inclination control part bulges, and a lap | wrap area with a top part. Therefore, it is possible to easily prevent the rocker arm from falling sideways simply by adjusting the bulging amount of the tilt restricting portion.

In Example 1 of this invention, it is a side view of the rocker arm structure which fractured | ruptured the rocker arm and the clip. It is a partial expanded sectional view of the rocker arm structure of the front view direction. FIG. 3 is a view corresponding to FIG. 2 showing a state where the rocker arm is tilted in the lateral direction and the tilt restricting portion is in contact with the outer surface of the support member. It is a partial enlarged bottom view of a rocker arm unit. It is a top view of a clip. It is a rear view of a clip. It is a side view of a clip.

Preferred embodiments of the present invention are shown below.
(1) Of the outer surface of the support member, a portion with which at least one of the pair of arm portions abuts may be a non-groove surface that is continuous without a step from an adjacent portion. According to this, since it is not necessary to provide a groove for mounting the clip on the outer surface of the support member, it is possible to reduce the manufacturing cost of the support member at low cost and to make the members common.

  (2) The tilt restricting portion has a linear concave bottom surface portion along the length direction of the pair of arm portions, and the linear concave bottom surface portion can come into contact with the outer surface of the support member. Good. Since the concave bottom portion of the tilt restricting portion is formed in a straight line, the tilt restricting portion can be easily formed, and the position at which the concave bottom portion contacts the outer surface of the support member can be determined as a target position. .

  (3) The rocker arm includes a roller that contacts a cam, a shaft portion that rotatably supports the roller, and a pair of opposing walls that support both end portions of the shaft portion. Two plate portions may be sandwiched between the pair of opposing walls and arranged in a rotation restricted state around the axis of the support member. By arranging the clip around the axis of the support member in a rotationally restricted state, the clip can be reliably attached to the rocker arm. Further, since the existing facing wall is used for the rocker arm, the structure of the rocker arm itself is not complicated.

  (4) The rocker arm structure may include the rocker arm and the clip, and the clip may be a rocker arm unit attached to the rocker arm. According to this, a rocker arm and a clip can be handled integrally.

  (5) It is good to be the said clip in the rocker arm structure as described above. According to this, it is possible to prevent the rocker arm from falling sideways with a relatively simple clip.

<Example 1>
A first embodiment of the present invention will be described with reference to FIGS. The rocker arm structure of the first embodiment includes a rocker arm 10, a lash adjuster 40 as a support member, and a clip 60. Among these, the rocker arm 10 and the clip 60 are integrally configured as a rocker arm unit 100.

  The rocker arm structure is assembled to the cylinder head 90 and constitutes a valve gear for an internal combustion engine. As shown in FIG. 1, the cylinder head 90 has a ventilation path 91 (intake port or exhaust port) and a through hole 92 communicating with the ventilation path 91. A stem guide 93 is fitted into the through hole 92 of the cylinder head 90, and the stem portion 94 of the valve 95 is inserted into the stem guide 93. The stem portion 94 protrudes upward from the upper surface of the cylinder head 90, and a cap 96 is attached to the upper end portion. The valve 95 has a disc-shaped valve body 97 below the stem portion 94. The valve body 97 faces the air passage 91 and is held in the valve closing direction under the urging force of the valve spring 98.

  Further, the cylinder head 90 has an attachment hole 99 disposed in parallel with the through hole 92 and an oil supply hole 89 communicating with the attachment hole 99. The lash adjuster 40 is inserted into the mounting hole 99 of the cylinder head 90.

  The lash adjuster 40 has a body 41 and a plunger 42. The body 41 has a bottomed cylindrical shape and has an open upper surface. The plunger 42 has a bottomed cylindrical shape, and has a top portion 43 that is semispherical in the upper portion 47 as shown in FIG. The top portion 43 has a top hole 44 penetrating in the vertical direction (axial direction) at the center. The outer surface of the top 43 has a hemispherical convex outer surface 45 in a region excluding the top hole 44.

  The body 41 is inserted into the mounting hole 99 of the cylinder head 90. The plunger 42 is inserted into the body 41. An upper portion 47 (including the top portion 43) of the plunger 42 is disposed so as to protrude above the body 41 and the cylinder head 90. As shown in FIGS. 2 and 3, the outer surface of the plunger 42 has a contacted region 46 that can contact a tilting restricting portion 73 of a clip 60 described later, below the top portion 43 of the upper portion 47. . Of the outer surface of the plunger 42, the contacted region 46 and the adjacent regions on both the upper and lower sides thereof are continuous without a step and have a non-grooved surface shape having no annular groove.

  Hydraulic oil is supplied from the oil supply hole 89 of the cylinder head 90 to the inside of the plunger 42 and the space between the bottom wall of the plunger 42 and the body 41. The plunger 42 can variably adjust the protruding amount of the upper portion 47 according to the hydraulic pressure of the hydraulic oil.

  As shown in FIG. 1, the rocker arm 10 includes an arm main body 11 that extends long in the front-rear direction (left-right direction in FIG. 1) from the front end portion to the rear end portion, and a roller 12 that is positioned in the front-rear intermediate portion of the arm main body 11. have. The arm body 11 is installed between a pair of opposing walls 13 that are parallel to each other in the width direction, a receiving part 14 that is installed between the front end parts of the opposing walls 13, and a rear end part of the opposing walls 13. And a pad portion 15. In addition, the arm body 11 defines an accommodation space 16 for accommodating the roller 12 between the opposing walls 13 and between the receiving portion 14 and the pad portion 15.

  The roller 12 is rotatably supported by the shaft portion 17 via a bearing (not shown). The shaft portion 17 is fixed by penetrating through the opposite walls 13 at the end portions in the width direction (left and right end portions). The outer peripheral surface of the roller 12 is in contact with the outer peripheral surface of the cam 88. The cam 88 is provided on a cam shaft 87 parallel to the shaft portion 17.

  As shown in FIG. 4, the pair of opposing walls 13 expands in a taper shape forward from the straight inner surface 23 along the front-rear direction that forms both side surfaces of the accommodation space 16 in the width direction, It has tapered inner surfaces 24 located on both sides in the width direction of the lower space of the receiving portion 14.

  As shown in FIG. 1, the pad portion 15 has a pressing surface 18 that gently curves downward. The pressing surface 18 of the pad portion 15 is in contact with the upper end portion (a cap 96 in the case of illustration) of the valve 95 so that the valve 95 can be pressed.

  As shown in FIG. 2, the receiving portion 14 is a portion that receives the top portion 43 of the plunger 42, and bulges upward in a hemispherical shape between the opposing walls 13. The inner surface of the receiving portion 14 has a concave dimple 19 facing the top hole 44 of the top portion 43 at the center, and a hemispherical concave hemisphere that can slide on the outer peripheral portion of the dimple 19 with the hemispheric outer surface 45 of the top portion 43. It has an inner surface 21. Part of the hydraulic oil stored in the plunger 42 can be lubricated between the hemispheric inner surface 21 of the receiving portion 14 and the hemispheric outer surface 45 of the top portion 43 through the dimple 19 from the top hole 44. . The outer surface of the receiving portion 14 is a hemispherical convex outer surface 22 whose central portion protrudes slightly sharply.

  As the cam 88 rotates, the rocker arm 10 swings in the vertical direction with the top 43 of the plunger 42 as a fulcrum, and accordingly, the pad portion 15 resists the urging force of the valve spring 98 and opens the valve 95 in the valve opening direction. The valve opening operation for pressing the valve 95 and the valve closing operation for displacing the valve 95 in the valve closing direction in accordance with the urging force of the valve spring 98 are repeatedly performed. While the valve 95 is opened and closed in this manner, the hemispheric outer surface 45 of the top portion 43 and the hemispheric inner surface 21 of the receiving portion 14 slide with each other, and the lash adjuster 40 changes the support height of the rocker arm 10 according to the internal hydraulic pressure. Automatic adjustment of valve clearance.

  Next, the clip 60 will be described. The clip 60 is formed by punching a metal plate material into a predetermined shape and then performing bending or the like. As shown in FIGS. 5 to 7, the clip 60 includes a first plate portion 61 and a second plate portion 62 that face each other in the vertical direction, and a connecting portion 63 that connects the first plate portion 61 and the second plate portion 62. Become. The connecting portion 63 is provided between the front end of the first plate portion 61 and the front end of the second plate portion 62 substantially along the vertical direction. The rear end of the first plate portion 61 and the rear end of the second plate portion 62 are free ends, and the clip 60 is open to the rear as a whole.

  As shown in FIG. 7, the first plate portion 61 constitutes the upper side portion of the clip 60, a base portion 64 that curves in a semicircular shape in side view and continues to the upper end of the connecting portion 63, and the base portion 64. It consists of an extended portion 65 that is curved at the rear end and extends slightly downward in the backward direction, and a protruding portion 66 that protrudes obliquely upward and rearward from the rear end of the extended portion 65.

  As shown in FIGS. 5 and 6, the clip 60 has a through hole 67 penetrating in the plate thickness direction at a central portion in the width direction and extending from the upper portion of the connecting portion 63 to the root portion 64. The hole 67 has a curved concave bottom end 81 at the connecting portion 63, and a portion excluding the bottom end 81 is opened with the same width. The rigidity of the base portion 64 is lowered by the punch hole 67. For this reason, the 1st board part 61 functions as an elastic piece which bends and deforms by using the base part 64 as a fulcrum. Further, the weight of the clip 60 is reduced by the hole 67.

  As shown in FIG. 5, the first plate portion 61 has a circular engagement hole 68 penetrating in the thickness direction in the center portion of the extension portion 65. The hole edge of the engagement hole 68 of the first plate portion 61 comes into contact with the outer surface 22 of the receiving portion 14 along the circumferential direction in the middle of the inclination. Further, the first plate portion 61 has upper oblique edge portions 69 that are tapered toward the protruding portions 66 on both side edges in the width direction.

  As shown in FIG. 7, the second plate portion 62 constitutes the lower side portion of the clip 60, has a front contact portion 71 in the front, has a rear contact portion 72 in the rear, and has a front contact. Between the portion 71 and the rear contact portion 72, there is a tilt restricting portion 73 that bulges downward in a concave shape.

  The front abutting portion 71 extends along the front-rear direction, and the front end is connected to the lower end of the connecting portion 63. The rear contact portion 72 extends in the front-rear direction at substantially the same height position as the front contact portion 71, and the rear end is a free end.

  As shown in FIG. 4, the second plate portion 62 has a circular elongated hole that is slightly longer in the front-rear direction and penetrates in the plate thickness direction between the front contact portion 71 and the rear contact portion 72 at the center portion. 74. The long hole 74 has an opening diameter larger than that of the engagement hole 68, and is positioned coaxially with the engagement hole 68 in the vertical direction.

  The second plate portion 62 has a pair of arm portions 75 facing each other in the width direction across the long hole 74 on both sides in the width direction of the long hole 74. The front ends of both arm portions 75 (front ends of the long holes 74) are connected to the front contact portion 71, and the rear ends (rear ends of the long holes 74) of both arm portions 75 are connected to the rear contact portion 72. . The second plate portion 62 has lower oblique edge portions 76 that are tapered in a taper shape from the rear region of both arm portions 75 to the front region of the rear contact portion 72 on both side edges in the width direction. The rear region of the rear contact portion 72 is narrower than the front contact portion 71 by way of the lower oblique edge portion 76.

  As shown in FIG. 7, the front portions 85 of both arm portions 75 are connected to the front contact portion 71 without a step in the front-rear direction, and the rear portions 84 of both arm portions 75 are stepless to the rear contact portion 72 in the front-rear direction. It is a continuous form. The tilt restricting portions 73 are arranged in a pair in the width direction in the portions excluding the front portion 85 and the rear portion 84 in both arm portions 75.

  As shown in FIG. 7, the tilt restricting portion 73 includes a front inclined portion 77 that extends obliquely downward and rearward from the front portion 85 of the arm portion 75, a rearward inclined portion 78 that extends obliquely downward and forward from the rear portion 84 of the arm portion 75, It consists of a concave bottom surface 79 that is installed in a straight line in the front-rear direction between the lower end of the front inclined portion 77 and the lower end of the rear inclined portion 78. The inclination angle of the front inclined portion 77 with respect to the front portion 85 and the inclination angle of the rear inclined portion 78 with respect to the rear portion 84 are substantially the same. For this reason, the front inclined portion 77 and the rear inclined portion 78 are configured to expand upward from the concave bottom surface portion 79 in a tapered shape. The longitudinal length of the concave bottom surface portion 79 is made larger than the radius of the contacted region 46 of the plunger 42. Note that the clip 60 as a whole has a line-symmetric form with an axial line portion extending in the front-rear direction passing through the center in the width direction.

Next, the function and effect of the first embodiment will be described.
The clip 60 is assembled to the rocker arm 10 from the front. At this time, the receiving portion 14 fits and fits into the engagement hole 68 of the first plate portion 61, and the first plate portion 61 is elastically applied to the outer surface 22 of the receiving portion 14 through the root portion 64 in the middle of the inclination. At the same time, the front abutting portion 71 and the rear abutting portion 72 of the second plate portion 62 abut on both sides in the width direction of the opening peripheral portion of the hemispheric inner surface 21 on the lower surface of the receiving portion 14 (see FIG. 1). As a result, the clip 60 is attached to the rocker arm 10 with the receiving portion 14 sandwiched between the front contact portion 71 and the rear contact portion 72 of the first plate portion 61 and the second plate portion 62. At this time, the connecting portion 63 is disposed close to the front of the receiving portion 14. The tilt restricting portion 73 of the second plate portion 62 is spaced downward from the lower surface of the receiving portion 14, and the concave bottom surface portion 79 is disposed substantially parallel to the lower surface of the receiving portion 14.

  As shown in FIG. 4, the second plate portion 62 is sandwiched between the pair of opposing walls 13 of the rocker arm 10 and is substantially positioned in the width direction. Specifically, the lower inclined edge portion 76 of the second plate portion 62 abuts or approaches along the tapered inner surfaces 24 of the opposing walls 13, and both side edges in the width direction of the rear region of the rear abutment portion 72 are located. The two opposing walls 13 are disposed in contact with or close to each other along the straight inner surface 23. Thereby, the clip 60 is arrange | positioned with respect to the rocker arm 10 at the movement restricted state in the width direction (direction around the axis of the lash adjuster 40). Thus, the rocker arm unit 100 in which the clip 60 is integrally attached to the rocker arm 10 is obtained.

  In the rocker arm structure, the rocker arm unit 100 has a pad portion 15 supported at the upper end portion of the valve 95 at the rear end portion and a receiving portion 14 supported at the top portion 43 of the plunger 42 at the front end portion. The top portion 43 of the plunger 42 is loosely inserted into the long hole 74 of the second plate portion 62 of the clip 60. Since the long hole 74 has a shape that is long in the front-rear direction, the second plate portion 62 can be prevented from interfering with the top portion 43 when the rocker arm 10 swings around the top portion 43 as a fulcrum. Yes.

  The tilt restricting portions 73 of the both arm portions 75 of the second plate portion 62 are disposed close to both sides in the width direction across the upper portion 47 of the plunger 42. As shown in FIG. 2, in a state where the receiving portion 14 is supported by the top portion 43, the hemispheric inner surface 21 of the receiving portion 14 abuts along the hemispheric outer surface 45 of the top portion 43, and the receiving portion 14 moves up and down with respect to the top portion 43. Cover with a predetermined lap area L1 in the direction. The downward bulging amount of the tilt restricting portion 73 (depth dimension from the front portion 85 and the rear portion 84 of the arm portion 75 to the concave bottom surface portion 79) L2 is equal to half of the lap region L1 of the receiving portion 14 with respect to the top portion 43. Or larger than half of the lap region L1 (L2 ≧ L1 / 2). For this reason, the amount that the rocker arm unit 100 covers the plunger 42 is ensured sufficiently larger than the case where only the receiving portion 14 covers the plunger 42 by adding the bulging portion of the tilt restricting portion 73.

  On the other hand, when the plunger 42 is most depressed with respect to the body 41, the tilt restricting portion 73 bulges downward so that the concave bottom surface portion 79 does not interfere with the cylinder head 90 or the upper end of the body 41. L2 is suppressed.

  In the assembling process or the like, as shown in FIG. 3, when the rocker arm 10 is tilted with respect to the top portion 43 in the width direction intersecting the surface along the swinging direction when the valve 95 is opened and closed, The arm portion 75 (the left arm portion 75 in FIG. 3) is displaced relatively downward and approaches the outer surface of the arm portion 75, and the other arm portion 75 (the right arm portion 75 in FIG. 3) is relatively moved. It is displaced upward and away from the outer surface of the arm portion 75. Then, the concave bottom surface portion 79 of the tilt restricting portion 73 in one arm portion 75 comes into contact with the contacted region 46 of the plunger 42, and further tilt displacement of the rocker arm 10 is restricted.

  Even if the rocker arm 10 is largely tilted and the hemispheric inner surface 21 of the receiving portion 14 is separated from the hemispheric outer surface 45 of the top portion 43, in addition to the tilt restricting portion 73 of one arm portion 75, the other arm The tilt restricting portion 73 of the portion 75 is also in contact with the contacted region 46 of the plunger 42, and further tilt displacement of the rocker arm 10 is restricted.

  Therefore, according to the first embodiment, it is possible to prevent the rocker arm 10 from falling in the lateral direction (width direction) in the assembling process or the like. In particular, in the case of the first embodiment, the receiving portion 14 is sandwiched between the first plate portion 61 and the second plate portion 62 of the clip 60, and the pair of arm portions 75 of the second plate portion 62 are separated from the receiving portion 14. Since the tilt restricting portion 73 bulges in a concave shape in the away direction, the bulging portion of the tilt restricting portion 73 and the lap area (L1 + L2) with the top portion 43 can be apparently ensured, and the tilt restricting portion 73 is swollen. It is possible to easily and reliably prevent the rocker arm 10 from falling sideways only by adjusting the protruding amount L2.

  Further, in the case of the first embodiment, the contact region 46 of the plunger 42 is a non-grooved surface having no step in the vertical direction, and has a special shape (an annular groove or the like) for locking the clip 60. Therefore, the manufacturing cost of the lash adjuster 40 can be kept low, and the members can be shared.

  Further, since the concave bottom surface portion 79 of the tilt restricting portion 73 is formed in a straight line, the tilt restricting portion 73 can be easily and accurately formed, and the concave bottom surface portion 79 is formed in the contacted region 46 of the plunger 42. It becomes easy to determine the position where the abuts as the target position.

  Furthermore, since the second plate portion 62 is sandwiched between the pair of opposing walls 13, the clip 60 is disposed in a rotation-restricted state around the axis of the lash adjuster 40, so that the clip 60 is attached to the rocker arm 10 with high reliability. It is done. In this case, since the existing pair of opposing walls 13 is used for the rocker arm 10, the structure of the rocker arm 10 is not complicated.

<Other embodiments>
Other embodiments will be briefly described below.
(1) The support member having the top portion is not limited to the lash adjuster, and may be a pivot that does not have a function of automatically adjusting the valve clearance, for example.
(2) The second plate portion may have a configuration in which the rear contact portion is continuously paired from both arm portions and the long hole is opened rearward.
(3) The 2nd board part may have a crevice between a pair of opposing walls in the state where it was pinched between a pair of opposing walls.
(4) The hole in the clip may be closed.

DESCRIPTION OF SYMBOLS 10 ... Rocker arm 12 ... Roller 13 ... Opposite wall 14 ... Receiving part 21 ... Hemispheric inner surface 22 ... Outer surface of receiving part 40 ... Rush adjuster (support member)
42 ... Plunger 43 ... Top part 45 ... Hemispheric outer surface of top part 60 ... Clip 61 ... First plate part 62 ... Second plate part 63 ... Connection part 73 ... Tilt restricting part 75 ... Arm part 79 ... Concave bottom part 88 ... Cam 95 ... valve

Claims (6)

A support member having a top portion, a rocker arm having a receiving portion for receiving the top portion, and a clip disposed across the rocker arm and the support member, and the outer surface of the hemisphere of the top portion slides on the inner surface of the hemisphere of the receiving portion. The valve is opened and closed by the rocker arm swinging around the top as a fulcrum,
The clip includes a first plate portion that comes into contact with an outer surface of the receiving portion, a second plate portion having a pair of arm portions disposed opposite to both sides of the support member, and the first plate. And a connecting portion connecting the second plate portion, and sandwiching the receiving portion between the first plate portion and the second plate portion,
The pair of arm portions bulge in a concave shape in a direction away from the receiving portion, and at least one of the pair of arm portions is supported by the support member when the rocker arm tilts in a direction intersecting a swinging direction when the valve is opened / closed with the top portion as a fulcrum. The rocker arm structure which has the inclination control part contact | abutted to the outer surface of the.   2. The rocker arm structure according to claim 1, wherein a portion of at least one of the pair of arm portions that abuts on the outer surface of the support member is a non-groove surface that is continuous from an adjacent portion without a step.   2. The tilt restriction portion has a linear concave bottom surface portion along a length direction of the pair of arm portions, and the linear concave bottom surface portion can come into contact with an outer surface of the support member. Or the rocker arm structure of Claim 2. The rocker arm includes a roller that contacts a cam, a shaft portion that rotatably supports the roller, and a pair of opposing walls that support both end portions of the shaft portion,
The rocker arm according to any one of claims 1 to 3, wherein the clip has the second plate portion sandwiched between the pair of opposing walls and is disposed in a rotation-restricted state around an axis of the support member. Construction.   A rocker arm unit comprising the rocker arm and the clip in the rocker arm structure according to any one of claims 1 to 4, wherein the clip is attached to the rocker arm.   The clip in the rocker arm structure according to any one of claims 1 to 4.

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