STRAIGHT OPERATING BEARING AND ITS MANUFACTURING METHOD

PURPOSE:To reduce a total cost of a straight operating bearing wherein a sliding element is slidably put over a raceway track base via balls by constituting the rolling groove on the sliding element of an arciform rolling face which bears a downward load and a linear rolling face which bears an upward load. CONSTITUTION:An arcilform rolling groove 3 on which balls 2 roll in symmetrical relation on the opposed sides is formed on a raceway track base 1 through its full length in the longitudinal direction. A U-shaped sliding element 4 which spans on the raceway track base 1 has bearing's raceway parts 5 projected at both sides thereof and an arciform rolling groove 6 is also formed on the inner face of parts 5 as opposed to the other rolling groove 3. The rolling face 6b of the rolling groove 6 bearing an upward load is formed to have a linear section. For making the rolling groove 6, a grinding wheel 9 having both an external face 9a having the same curvature as that of the rolling face 6a of the rolling groove 6 and a peripheral flat end face 9b is positioned obliquely. The grinding wheel 9 having a large diameter may be used for grinding and the total cost be reduced.