Vehicle brake hydraulic pressure control apparatus and method for manufacturing the same

A vehicle brake hydraulic pressure control apparatus, comprising:

• a base body;
• and
• a solenoid valve that is attached to an attachment hole which opens on one surface of the base body, wherein
• a plurality of press-fitting portions that are press-fitted to directly contact an inner peripheral surface of the attachment hole are provided on an outer peripheral surface of the solenoid valve at an interval in a hole axis direction, the inner periphery surface of the attachment hole directly facing the outer peripheral surface of the solenoid valve,
• contact lengths, in the hole axis direction, between the inner peripheral surface of the attachment hole and two of the press-fitting portions are different from each other,
• wherein the solenoid valve includes:
• a valve housing that is inserted into the attachment hole, and
• a cylindrical cover member that covers the housing,
• an opening end portion of the cover member is inserted into the attachment hole,
• at least one of the press-fitting portions is formed on an outer peripheral surface of the cover member,
• an outer peripheral surface of the press-fitting portion of the cover member is press-joined to directly contact the inner peripheral surface of the attachment hole, and
• an inner peripheral surface of the press-fitting portion of the cover member is press-joined to directly contact an outer peripheral surface of the valve housing,
• the attachment hole is a stepped cylindrical hole which has a bottom surface with a diameter that increases step by step toward an upper surface from an inner side of the base body,
• the attachment hole has a bottom portion, an intermediate portion, an entrance portion, and an opening edge portion,
• the intermediate portion is formed on an upper side of the bottom portion,
• the entrance portion is formed on an upper side of the intermediate portion, and
• the opening edge portion opens on the upper surface,
• a first hole guide portion is formed between the bottom portion and the intermediate portion,
• a second hole guide portion is formed between the intermediate portion and the entrance portion,
• a hole diameter of the intermediate portion is larger than that of the bottom portion,
• an inner peripheral surface of the first hole guide portion is a tapered surface with a diameter that increases from the bottom portion toward the intermediate portion, and
• a hole diameter of the entrance portion is larger than that of the intermediate portion,
• an insertion portion is press-fitted into the attachment hole, which has a stepped cylindrical component with a diameter that increases step by step going upward,
• the insertion portion has a proximal portion, a first press-fitting portion of the press fitting portions, formed on an upper side of the proximal portion, and a cover attachment portion formed on an upper side of the first press-fitting portion, and a first valve guide portion is formed between the proximal portion and the first press-fitting portion,
• the first press-fitting portion is a portion which is press-fitted into the bottom portion of the attachment hole,
• openings of communication holes which communicate with an inside of the insertion portion are formed in an outer peripheral surface of the first press-fitting portion,
• the outer diameter of the first press-fitting portion is larger than the hole diameter of the bottom portion,
• the first press-fitting portion is press-fitted into the bottom portion, such that an outer peripheral surface of the first press-fitting portion is press-joined to the inner peripheral surface of the bottom portion over an entire circumference which has a press-fitted part forming a first contact length (A1) of the contact lengths, and
• the press-fitted part seals a space between the outer peripheral surface of the first press-fitting portion and the inner peripheral surface of the bottom portion liquid-tightly,
• the first valve guide portion is a portion which extends from a bottom edge of the first press-fitting portion to the top edge of the proximal portion,
• an outer peripheral surface of the first valve guide portion is a tapered surface with a diameter that decreases from the first press-fitting portion toward the proximal portion the press-fitting portion of the cover member is a second press-fitting portion of the press-fitting portions is formed on a lower side of a housing portion and is fitted onto the cover attachment portion of the insertion portion and press-fitted into the intermediate portion of the attachment hole,
• an outer diameter of the second press-fitting portion is larger than that of the housing portion and is larger than the intermediate portion,
• the second press-fitting portion is press-fitted into the intermediate portion, such that the outer peripheral surface of the second press-fitting portion is press-joined to an inner peripheral surface of the intermediate portion over an entire circumference which has a press-fitted part forming a second contact length (A2) of the contact lengths, and
• the press-fitted part seals a space between the outer peripheral surface of the second press-fitting portion and the inner peripheral surface of the intermediate portion liquid-tightly.