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

摘要

To prevent occurrence of jetting in an injection molding of a protection cover with a thin-walled partition wall at a disc part.SOLUTION: A protection cover 1 is molded through injection molding of synthetic resin and comprises a disc part 2, a sensor holder part 4 protruded from the disc part 2 inwardly and a protrusion part 6 protruded inwardly from the disc part 2 and connected to the sensor holder part 4. The disc part 2 is formed with a more thin-walled partition wall for partitioning between a magnetic encoder and a magnetic sensor than other portions. An inner side surface of the protrusion part 6 has a gate mark GM formed by said injection molding, and the outer surface of the protrusion part 6 is provided with a thickness thin part 7 extending inward to approach to the gate mark GM. Synthetic resin molten material poured from a gate positioned at the gate mark GM through said injection molding strikes against a column part used for arranging the thickness thin part 7 to change its direction and said molten material flows along a wall surface of a die, so that no jetting occurs.SELECTED DRAWING: Figure 5