Cam bracket

#The present invention relates to an improvement of a cam bracket for supporting a camshaft on the cylinder head of an internal combustion engine.

#In a comparable case of the art, as shown in the exploded perspective view of FIG. 7, a camshaft 1 is provided with cams 2, 2 to open and close the intake and exhaust valves of an engine. Also, the camshaft 1 is provided with two pieces of thrust plates 3, 3 at an interval in order to prevent the camshaft 1 from moving in its axial direction. On the front end of the camshaft 1 there is provided a cam sprocket 4, to which is transferred the rotating force from the crank shaft of the engine by a chain, belt or the like so as to rotate the camshaft 1.

#On the journal surface 6 hollowed in the cylinder head 5 to fit the camshaft 1 there is formed an oil hole 7 to supply oil.

#In the drawings:

#FIG. 1 is an exploded perspective view of a cylinder head, camshaft and cam bracket;

#FIG. 2 is an enlarged plan view of the cam bracket in FIG. 1;

#Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

#FIG. 1 is an exploded perspective view of a camshaft and its circumference. A camshaft 1 is provided with cams 2, 2 and also with one piece of thrust plate 3. The journal surface 6 to support this camshaft 1 is formed in a hollow fashion on a cylinder head 5 and an oil hole 7 to supply oil is formed on the journal surface 6.

#Also, a cam bracket 8 is attached to the journal surfaces 6, 6 with bolts 12 (FIG. 2, FIG. 4) so as to support the camshaft 1 for rotation. On the cam bracket 8, as shown in the enlarged plan view of FIG. 2, the vertical sectional view of FIG. 3 (taken on line of the thrust plate slot in FIG. 2), and the side arrangement of FIG. 4, are integrally formed support portions or apron portions 9, 9 that are projected backward, so that the cam bracket 8 is wider than ordinal cam brackets. The upper side of this apron 9 is cut away to make a cutaway surface 9a. A thrust plate slot 10 for supporting the thrust plate 3 is vertically formed penetrating the apron portion 9 and opening the cutaway surface 9a. On the cutaway surface 9a at the upper end of the thrust plate slot 10 are integrally formed oil sumps 11, 11 hollowed downward than the cutaway surface 9a so as to store oil. Accordingly, surrounding the oil sump 11 there is formed a bank rising above the upper surface of the bracket body 8a.