| 摘要 |
An engageable cam follower (1) for acting on a pushrod in the valve train of an internal combustion engine is provided. This cam follower (1) includes of a thin-walled hollow cylindrical housing (2) in whose borehole (3) is positioned an internal element (4) axially movable with respect to the housing (2). The housing (2) and the internal element (4) each possess a radial borehole (13, 10) aligned in a relative position to each other. Positioned in the radial borehole (10) of the internal element (4) is a piston (11) having a convex end (14) and movable toward the radial borehole (13) of the housing (2) for coupling the internal element (4) with the housing (2) in the relative position. According to the invention, the borehole (3) of the housing (2) is shaped in the area of the radial borehole (13) of the housing (2) as a flattening (15) extending in the longitudinal direction of the cam follower (1). This has the advantage that with the piston (11) positioned only slightly in the radial borehole (13) and with initial cam lifting, this piston (11) is load-bearing over a considerable portion of its periphery. As a result, removal of material from the piston (11), such as can occur in the state of the art and which can lead to jamming of the internal element (4) in the housing (2), is no longer encountered.
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