Abstract: A rocker arm that is rockably attached to a cylinder head actuates a valve by a guide groove that is formed at an end thereof engaging with an upper end of a valve stem, and a roller that is mounted in a roller housing portion of the arm main unit contacting against a cam and rocking. The guide groove is formed by press working ends of the arm main unit in the thickness direction of the plate material to form a pair of walls, and thereafter applying sandwiching pressure in the lateral direction to the walls to increase the height thereof.

Abstract: The rocker arm 1 of this embodiment has a pair of side wall portions 21 formed so as to face each other, an engaging portion 22 connecting the pair of side wall portions 21 and adapted to engage with a rocking support member 4 arranged in an engine, a sliding portion 26 connecting the pair of side wall portions 21 and being adapted to be in slidable contact with a stem front end portion 631 of an engine valve 63. The engaging portion 22 has a board surface portion 23 connecting the pair of side wall portions 21 and a protruding portion 24 protruding from the board surface portion 23 toward the rocking support member 4. In the protruding portion 24, a spherical concave portion 25 adapted to engage with a spherical protruding portion 41 of the rocking support member 4 is formed as a depression.

Abstract: A valve gear comprises a cylinder head, a supporting member fixed to the cylinder head, a rocker arm which is mounted on the supporting member so as to be placed on the latter, a substantially plate-shaped clip mountable to the rocker arm, the clip having a fitting hole in which an outer periphery of the supporting member is fitted so that the clip is prevented from falling off, a pair of walls which is formed on the rocker arm so as to be opposed to each other with the supporting member being located therebetween, and a pair of locking portions formed in inner faces of the walls so that outer edges of the clip are elastically engaged with the locking portions thereby to be locked, respectively.

Abstract: A rocker arm includes a roller rotatably mounted between two sidewalls thereof. The roller is pressed by a cam. The rocker arm also includes two washers that reduce a wobbling motion of the roller with respect to the cam. The washers guiding mechanism the rocking movement of the rocker arm in the up-and-down direction, thereby reducing wobbling motion of the rocker arm when an engine runs.

Abstract: A rocker arm installed module 1 is constructed by installing the cam shaft 3, the rocker arm 4 and the pivot 5 to the housing 2. The housing 2 is provided with a drop-off preventing means 21 for supporting and preventing the rocker arm 4, which is disposed on the pivot 5, from dropping off. The rocker arm installed module 1 is constructed by disposing the rocker arm 4 among the cam 31 of the cam shaft 3, the pivot 5 and the drop-off preventing means 21 in the housing 2 to form a module, the module being configured to be disposed in a concave portion 61 of the cylinder head 6 while preventing the rocker arm 4 from dropping off.

Abstract: A rocker arm 6 that is rockably attached to a cylinder head 1 actuates a valve 4 by means of a guide groove 73b that is formed at an end thereof engaging with an upper end of a valve stem 41, and a roller 8 that is mounted in a roller housing portion 72 of the arm main unit 7 contacting against a cam 31 and rocking. The guide groove 73b is formed by press working ends of the arm main unit 7 in the thickness direction of the plate material to form a pair of walls 73d, and thereafter applying sandwiching pressure in the lateral direction to the walls 73d to increase the height thereof.