Brake liquid pressure control unit of on-vehicle device and its manufacturing method

A manufacturing method of a brake liquid pressure control unit for an on-vehicle device, the brake liquid pressure control unit comprising:

• a base block in a substantially rectangular parallelopiped;
• at least one reservoir disposed on the base block to temporarily reserve a working liquid in a liquid pressure circuit;
• a motor to operate a pump to supply the working liquid:
• an electronic printed circuit board block to control at least an electromagnetic valve, the motor and electronic printed circuit board block being attached onto mutually opposing first and second base surfaces of the base block, respectively;
• a cylindrically shaped hole formed on one of four base surfaces of the base block except the first and second base surfaces;
• and a lid member constituting the reservoir together with the cylindrically shaped hole and formed substantially in an inverted bell shape, the lid member comprising a cylindrical wall projected externally from the four base surfaces of the base block on which the cylindrically shaped hole is formed, further comprising a plurality of approximately arc shaped engagement portions to engageably retain the lid member thereon by performing a partial staking of an opening edge of the cylindrically shaped hole along an outer periphery of the lid member, the method comprising:
• forming a ring-shaped concave shaped step portion to dispose the lid member on the opening end portion of the cylindrically shaped hole of the base block;
• preparing a punch having a plurality of pressure applying projections on an outer periphery thereof, each pressure applying projection having an arc surface of a larger radius of curvature than an inner peripheral surface of the concave formed step portion;
• and
• performing the partial staking simultaneously on the upper edge of the concave shaped step portion by means of the plurality of punches after the lid member is arranged on the concave shaped step portion.

A brake liquid pressure control unit for an on-vehicle device, comprising:

• base block means in a substantially rectangular parallelopiped;
• working liquid reserving means disposed on the base block for temporarily reserving a working liquid in a liquid pressure circuit;
• operating means for operating a pump to supply the working liquid:
• electronic printed circuit board block means for controlling at least an electromagnetic valve, the operating means and electronic printed circuit board block means being attached onto mutually opposing first and second base surfaces of the base block means, respectively;
• cylindrically shaped hole means formed on one of four base surfaces of the base block means except the first and second base surfaces;
• and
• lid member means constituting the reserving means together with the cylindrically shaped hole means and formed substantially in an inverted bell shape, the lid member means comprising a cylindrical wall projected externally from the four base surfaces of the base block on which the cylindrically shaped hole means is formed.