Parts assembly having sacrificial deformation portion

A parts assembly, comprising:

• a housing including a first part assembly hole on which a first apparatus component is assembled, the first apparatus component being fixed to the housing by means of a caulking for forming a caulking portion by a deformation of a bearing surface of the housing on which the first apparatus component is seated,
• the housing including a second part assembly hole provided at a portion to which a force applied to the housing when the bearing surface is caulked and deformed is propagated and on which a second apparatus component is assembled,
• the housing including a sacrificial deformation portion deformed by a force applied to the housing when the bearing surface is deformed by means of the caulking, the sacrificial deformation portion attenuating a force propagated to a portion including the second part assembly hole, wherein the sacrificial deformation portion is constituted by a hole provided at an inner portion of the housing and arranged between the caulking portion and the second part assembly hole.

A parts assembly, comprising:

• a housing including a first part assembly hole on which a first apparatus component is assembled, the first apparatus component being fixed to the housing by means of a caulking for forming a caulking portion by a deformation of a bearing surface of the housing on which the first apparatus component is seated,
• the housing including a second part assembly hole provided at a portion to which a force applied to the housing when the bearing surface is caulked and deformed is propagated and on which a second apparatus component is assembled,
• the housing including a sacrificial deformation portion deformed by a force applied to the housing when the bearing surface is deformed by means of the caulking, the sacrificial deformation portion attenuating a force propagated to a portion including the second part assembly hole, wherein an electromagnetic valve for opening and closing a hydraulic passage is assembled on the first part assembly hole and a piston pump driven by a motor is assembled on the second part assembly hole to constitute a hydraulic unit for controlling a brake fluid pressure.