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Brake liquid pressure control unit of on- vehicle device and its manufacturing methodRelated Patent Categories: Metal Working, Method Of Mechanical Manufacture, Electrical Device MakingBrake liquid pressure control unit of on- vehicle device and its manufacturing method description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20070251081, Brake liquid pressure control unit of on- vehicle device and its manufacturing method. Brief Patent Description - Full Patent Description - Patent Application Claims
CROSS-REFERENCE TO RELATED APPLICATIONS [0001] The present application is a divisional of U.S. application Ser. No. 11/184,874, filed Jul. 20, 2005, which is a divisional of U.S. application Ser. No. 10/127,696, filed Apr. 23, 2002, now U.S. Pat. No. 6,979,063. The entire contents of these applications are incorporated herein by reference. BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] The present invention relates to a brake liquid pressure control unit of an on-vehicle device including a control mechanism in a brake system such as an anti-lock brake system (ABS), a vehicular motion control system, a traction control system and its manufacturing method. [0004] 1. Description of the Related Art [0005] Such a kind of brake liquid pressure control unit as described above is exemplified by an international patent application publication official gazette No. WO99/25594 published on May 27, 1999. [0006] The previously proposed brake liquid pressure control unit as disclosed in the above-described publication, a liquid pressure circuit including a liquid pressure device such as a pump is disposed on a base block in substantially a rectangular parallelepiped formed of an aluminum material. A pump driving motor and an electronic circuit board block to control an electromagnetic valve or another electronic device are attached onto two surfaces, i.e., a first base surface and a second base surface which faces against each other in mutually opposing direction. [0007] In addition, a reservoir in which a piston and bias device are housed is disposed with a space enclosed by a cylindrically shaped hole and a lid member. The reservoir temporarily reserves a working liquid (brake liquid) within the liquid pressure circuit. The cylindrical hole of the reservoir is formed on the second base surface on which the electronic circuit board block is attached and the lid member attached onto an opening end of the cylindrically shaped hole is projected into a covering of the electronic circuit board block. SUMMARY OF THE INVENTION: [0008] It is desirable that, in such a kind of the brake liquid pressure control unit, the whole unit needs to be designed as compact as possible since the brake liquid pressure control unit is arranged within a limited space of an automotive vehicle. However, since the reservoir is attached onto the same second base surface as the electronic circuit board block, a width of the whole brake liquid pressure control unit becomes unavoidably large. Hence, it is difficult to improve a vehicular mounting ability. That is to say, if the cylindrically shaped hole formed on the base block is made deeper, the width of the base block itself is unavoidably needed to be wider. To avoid this, if a height of the projected part of the lid member is increased, it becomes unavoidably necessary to increase the height of the electronic circuit board block in order to avoid an interference between the circuit board in the electronic circuit block and other parts. [0009] It is, hence, an object of the present invention to provide a brake liquid pressure control unit on an on-vehicle device and its manufacturing method in which a width of a base block on which a motor and an electronic circuit block are disposed is narrowed and, while the whole base block is maintained to be compact, a reservoir can be arranged on the same base block so that a vehicular mounting ability is superior. [0010] According to one aspect of the present invention, there is provided a brake liquid pressure control unit for an on-vehicle device, 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 a 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. [0011] According to another aspect of the present invention, there is provided 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. [0012] This summary of the invention does not necessarily describe all necessary features so that the invention may also be a sub-combination of these described features. BRIEF DESCRIPTION OF THE DRAWINGS: [0013] FIG. 1 is a longitudinal cross section view of a brake liquid pressure control unit in a first preferred embodiment according to the present invention. [0014] FIG. 2 is a cross section view cut away along a line A-A shown in FIG. 1. [0015] FIG. 3 is an expanded cross section view of a reservoir shown in FIG. 2. [0016] FIG. 4 is an arrow marked directional view of B shown in FIG. 3. [0017] FIG. 5 is a rear surface view of a base block in the first embodiment shown in FIG. 1. [0018] FIG. 6 is a perspective view of a punch for staking in the first embodiment shown in FIG. 1. [0019] FIG. 7 is a cross section view cut away along a line C-C in FIG. 6. [0020] FIG. 8 is an expanded cross section view for explaining a state before the staking in the first embodiment shown in FIG. 1. 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