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

Abstract

In brake liquid pressure control unit for an on-vehicle device and its manufacturing method, a lid member constituting at least one reservoir together with a cylindrically shaped hole is formed substantially in a bell shape, the lid member comprising a cylindrical wall projected externally from one of four base surfaces expect mutually opposing first and second base surface of a base block of a rectangular parallelopiped on which the cylindrically shaped hole is formed.

1 . 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 pressure applying projections after the lid member is arranged on the concave shaped step portion.    
   
   
       2 . 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 parallelepiped comprising four base surfaces; at least one reservoir disposed on the base block to temporarily store a working liquid; 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 four 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; a lid member constituting the reservoir together with the cylindrically shaped hole; and a plurality of approximately arc shaped engagement portions to engageably retain the lid member thereon by partial staking an opening edge of the cylindrically shaped hole along an outer periphery of the lid member, the method comprising: 
 providing 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;    providing 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 using the plurality of pressure applying projections after positioning the lid member on the concave shaped step portion.