PROTECTION COVER WITH SENSOR HOLDER PART, BEARING DEVICE WITH SAID PROTECTION COVER AND PROCESS OF MANUFACTURE OF THE PROTECTION COVER WITH THE SENSOR HOLDER PART

摘要

To improve degree of freedom in design while a reduction in a partition wall or a strength degradation can be prohibited at an injection molding for a protection cover having a thin-walled partition wall at a disc part.SOLUTION: A protection cover 1 comprises a synthetic resin disc part 2 formed with a more thin-walled partition wall 5 than that of other portions to make a partition between a magnetic encoder and a magnetic sensor; and a synthetic resin sensor holder part 4 protruding from the disc part 2 inwardly, and an outer peripheral surface 2A at the disc part 2, or an outer peripheral surface 3A of a cylindrical part 3 connected to the disc part 2, which is molded through injection molding of synthetic resin and positioned outside in a radial direction of the partition wall 5, shows a gate mark caused by said injection molding. Since there is provided a gate that is near to the partition wall 5 and outside in a radial direction of the partition wall 5, no filling terminal weld is produced at the partition wall 5 when molten material of synthetic resin is poured from said gate into a cavity of an injection molding die at the injection molding stage and solidified.SELECTED DRAWING: Figure 4