IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0131595
(2002-04-25)
|
등록번호 |
US-7427114
(2008-09-23)
|
우선권정보 |
JP-2001-127632(2001-04-25); JP-2002-074048(2002-03-18) |
발명자
/ 주소 |
- Ohishi,Yuji
- Morita,Hikaru
- Nakazawa,Chiharu
- Hiwatashi,Daisuke
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
2 인용 특허 :
27 |
초록
▼
A vehicular brake fluid pressure control unit includes a base block of aluminum material having a cylinder bore containing a piston and a return spring, and a cover member fixed to the base block to cover an open end of the cylinder bore. The cover member is formed with a vent hole opening into an a
A vehicular brake fluid pressure control unit includes a base block of aluminum material having a cylinder bore containing a piston and a return spring, and a cover member fixed to the base block to cover an open end of the cylinder bore. The cover member is formed with a vent hole opening into an atmospheric chamber in the cover member, and made of aluminum. material.
대표청구항
▼
What is claimed is: 1. A brake fluid pressure control unit for a vehicle, the brake fluid pressure control unit comprising: a base block of aluminum material, formed with a cylinder bore extending axially from a bottom end to an open end, the base block including a fixing portion to fix a cover mem
What is claimed is: 1. A brake fluid pressure control unit for a vehicle, the brake fluid pressure control unit comprising: a base block of aluminum material, formed with a cylinder bore extending axially from a bottom end to an open end, the base block including a fixing portion to fix a cover member to the base block; a piston received slidably in the cylinder bore and shaped to divide the inside of the cylinder bore into a fluid chamber and an atmospheric chamber; a bias member disposed between the piston and the cover member, and arranged to urge the piston toward the bottom end of the cylinder bore; and the cover member fixed to the base block to cover the open end of the cylinder bore, and made of aluminum material, wherein the cover member includes a flange, the flange including a tapered surface projecting outward in a direction toward the bottom end such that a diameter of an outer portion of the tapered surface toward the bottom end is greater than a diameter of an inner portion of the tapered surface, wherein a thickness of the flange at the inner portion of the tapered surface, wherein the fixing portion of the base block and the tapered surface of the flange are staked, wherein the base block includes a substantially flat annular shoulder surface facing away from the bottom end of the cylinder bore; and wherein the cover member includes a substantially flat annular cover end surface facing toward the bottom end of the cylinder bore, the annular cover end surface including a substantially flat outer region abutting on the annular shoulder surface of the base block and a substantially flat inner region projecting from the outer region radially inward beyond the annular shoulder surface into the cylinder bore and facing axially toward the piston. 2. The brake fluid pressure control unit as claimed in claim 1, wherein the cover member is a forging. 3. The brake fluid pressure control unit as claimed in claim 1, wherein the cover member comprises an end wall and a cylindrical wall projecting from the base block, to the end wall. 4. The brake fluid pressure control unit as claimed in claim 1, wherein the fixing portion is deformed by a staking process. 5. The brake fluid pressure control unit as claimed in claim 4, wherein the fixing portion of the base block extends around the open end of the cylinder bore, in the form of an annular inward flange. 6. The brake fluid pressure control unit as claimed in claim 4, wherein the fixing portion of the base block comprises a plurality of separate portions arranged around the open end of the cylinder bore, and spaced from one another. 7. The brake fluid pressure control unit as claimed in claim 1, wherein the base block comprises: a first side face to which a first component is fixed; and a second side face to which a second component is fixed; wherein the fixing portion includes first and second fixing portions each extending around the open end of the cylinder bore from a first end to a second end, the first ends of the first and second fixing portions being separated by a first plain region adjacent to the first side face, the second ends of the first and second fixing portions being separated by a second plain region adjacent to the second side face. 8. The brake fluid pressure control unit as claimed in claim 1, wherein the cover member is in direct contact with the base block. 9. The brake fluid pressure control unit as claimed in claim 1, wherein the flange has a solid construction and has an inner surface substantially parallel to the cylinder bore. 10. The brake fluid pressure control unit as claimed in claim 1, wherein the cover is formed with a vent hole opening into the atmospheric chamber. 11. The brake fluid pressure control unit as claimed in claim 1, wherein the piston and the cover member are spaced apart axially from each other by the bias member. 12. The brake fluid pressure control unit as claimed in claim 1, wherein the piston includes a piston end wall defining the fluid chamber between the bottom end of the cylinder bore and the piston end wall of the piston, and a cylindrical wall extending axially from the piston end wall to an annular piston end surface facing away from the piston end wall so that the piston is bounded axially between the piston end wall and the annular piston end surface; and wherein the cover member includes a cover end wall and a cylindrical wall extending axially from the cover end wall to the annular cover end surface that axially confronts the annular piston end surface of the piston. 13. The brake fluid pressure control unit as claimed in claim 12, wherein the annular piston end surface of the piston is spaced apart from the annular cover end surface of the cover member toward the bottom end of the cylinder bore when the piston is at a position closest to the bottom end of the cylinder bore. 14. A brake fluid pressure control unit for a vehicle, the brake fluid pressure control unit comprising: a base block of aluminum material, formed with a cylinder bore extending from a bottom end to an open end; a piston received slidably in the cylinder bore and shaped to divide the inside of the cylinder bore into a fluid chamber and an atmospheric chamber; a bias member disposed between the piston and a cover member, and arranged to urge the piston toward the bottom end of the cylinder bore; and the cover member fixed to the base block to cover the open end of the cylinder bore, and made of aluminum material, wherein the base block comprises a fixing portion to fix the cover member to the base block by staking, wherein the cover member comprises an outward flange projecting outward to an outer end and having a tapered surface sloping toward the outer end of the outward flange so that a thickness of the outward flange, in a direction from an inner portion of the outward flange to the outer end, gradually becomes smaller and the fixing portion of the base block is a portion deformed onto the outward flange of the cover member, wherein the base block has an annular recess around the open end of the cylinder bore and depressed from an outside surface of the base block, the outward flange of the cover member is received in the annular recess, wherein the base block comprises an annular shoulder surface facing away from the bottom end of the cylinder bore, and an inside cylindrical surface surrounding the annular shoulder surface and bounding the annular recess with the annular shoulder surface, and wherein the cover member comprises an annular end surface facing toward the bottom end of the cylinder bore, the annular end surface including an outer region abutting on the annular shoulder surface of the base block and an inner region projecting radially into the cylinder bore and facing axially toward the piston. 15. The brake fluid pressure control unit as claimed in claim 14, wherein the fixing portion of the base block extends around the open end of the cylinder bore, in the form of an annular inward flange. 16. The brake fluid pressure control unit as claimed in claim 14, wherein the fixing portion of the base block comprises a plurality of separate portions arranged around the open end of the cylinder bore, and spaced from one another. 17. The brake fluid pressure control unit as claimed in claim 14, wherein the base block further comprises an annular depressed surface which is depressed below the outside surface of the base block and which extends radially over the outward flange of the cover member. 18. The brake fluid pressure control unit as claimed in claim 14, wherein the fixing portion of the base block includes a radial inner end located on the taper surface sloping toward the outer end of the outward flange. 19. The brake fluid pressure control unit as claimed in claim 14, wherein the inner region of the annular end surface of the cover member projects radially inwards into the cylinder bore and abuts against the piston to limit axial movement of the piston. 20. The brake fluid pressure control unit as claimed in claim 14, wherein the outward flange has a solid construction and has an inner surface substantially parallel to the cylinder bore. 21. The brake fluid pressure control unit as claimed in claim 14, wherein the cover is formed with a vent hole opening into the atmospheric chamber. 22. The brake fluid pressure control unit as claimed in claim 14, wherein the piston is supported slidably only by the base block within the cylinder bore so that the piston remains apart axially from the cover member during sliding movement of the piston in the cylinder bore. 23. The brake fluid pressure control unit as claimed in claim 14, wherein the cover member comprises an end wall and a cylindrical wall projecting from the outside surface of the base block, to the end wall. 24. The brake fluid pressure control unit as claimed in claim 23, wherein the cover member comprises a rounded corner between the tapered surface of the outward flange and an outside cylindrical surface of the cylindrical wall, and a rounded edge between the tapered surface of the outward flange and the outer end of the outward flange. 25. A brake fluid pressure control unit for a vehicle, the brake fluid pressure control unit comprising: a base block of aluminum material, formed with a cylinder bore extending axially from a bottom end to an open end opened in a lower outside surface of the base block, and including an annular recess formed along the open end of the cylinder bore and extending radially into the base block; a piston received slidably in the cylinder bore; a spring arranged to urge the piston toward the bottom end of the cylinder bore; and a cover member of aluminum material, including an end wall supporting one end of the spring disposed between the piston and the cover member, and an outward flange received in the annular recess of the base block and fixed to the base block, wherein the outward flange includes a tapered surface projecting outward in a direction toward the bottom end such that a diameter of an outer portion of the tapered surface toward the bottom end is greater than a diameter of an inner portion of the tapered surface, wherein the base block includes a substantially flat annular shoulder surface facing away from the bottom end of the cylinder bore; and wherein the cover member includes a substantially flat annular end surface facing toward the bottom end of the cylinder bore, the annular end surface including a substantially flat outer region abutting on the annular shoulder surface of the base block and a substantially flat inner region projecting radially into the cylinder bore and facing axially toward the piston. 26. The brake fluid pressure control unit as claimed in claim 25, wherein the outward flange has a solid construction and has an inner surface substantially parallel to the cylinder bore. 27. The brake fluid pressure control unit as claimed in claim 25, wherein the annular recess includes a substantially flat shoulder surface formed facing away from the bottom end of the cylinder bore, and wherein the base block has a fixing portion that fixes the outward flange to the base block, the fixing portion having an outer surface substantially parallel to the shoulder surface. 28. The brake fluid pressure control unit as claimed in claim 25, wherein the piston is supported slidably only by the base block within the cylinder bore so that the piston remains apart axially from the cover member during sliding movement of the piston in the cylinder bore. 29. The brake fluid pressure control unit as claimed in claim 25, wherein the cover member further includes a cylindrical wall projecting from the lower outside surface of the base block. 30. A brake fluid pressure control unit for a vehicle, the brake fluid pressure control unit comprising: a base block of aluminum material, formed with a cylinder bore extending from a bottom end to an open end; a piston received slidably in the cylinder bore and shaped to divide the inside of the cylinder bore into a fluid chamber and an atmospheric chamber; a bias member disposed between the piston and a cover member, and arranged to urge the piston toward the bottom end of the cylinder bore; the cover member being fixed to the base block to cover the open end of the cylinder bore, the cover member formed with a vent hole opening into the atmospheric chamber, and made of the aluminum material; and fixing means for fixing the cover member to the base block by staking, the fixing means including a first portion of aluminum material formed integrally in the base block and including a radial annular recessed portion with a substantially flat shoulder portion, and a second portion of aluminum material which is formed integrally in the cover member, the second portion being directly clamped by the first portion of the base block against the annular recessed portion, wherein the base block includes a substantially flat annular shoulder surface facing away from the bottom end of the cylinder bore; wherein the cover member includes a substantially flat annular end surface facing toward the bottom end of the cylinder bore, the annular end surface including a substantially flat outer region abutting on the annular shoulder surface of the base block and a substantially flat inner region projecting radially into the cylinder bore and facing axially toward an end of the piston; and wherein the first portion of the fixing means formed integrally in the base block comprises a plurality of separate portions, non-continuous from one another, arranged around the open end of the cylinder bore, and spaced from one another. 31. The brake fluid pressure control unit as claimed in claim 30, wherein the piston is supported slidably only by the base block within the cylinder bore so that the piston remains apart axially from the cover member during sliding movement of the piston in the cylinder bore. 32. The brake fluid pressure control unit as claimed in claim 30, wherein each of the separate portions is an annular projection projecting radially inward around the open end of the cylinder bore, and wherein the separate portions are spaced from one another with intervening gaps so that the separate portions and the gaps are arranged alternately around the open end of the cylinder bore. 33. The brake fluid pressure control unit as claimed in claim 30, wherein the separate portions are arc-shaped portions, and are spaced circumferentially from one another by a plurality of plain regions having no fixing portion so that the separate portions and the plain regions are arranged alternately around the open end of the cylinder bore. 34. The brake fluid pressure control unit as claimed in claim 33, wherein the plain regions are arc-shaped, and the separate portions and the plain regions are arranged alternately in a circle around the open end of the cylinder bore. 35. The brake fluid pressure control unit of claim 34, further comprising a pump driving motor mounted to a first facing of the base block and the cylinder bore formed in a second facing of the base block, wherein the plain regions are positioned closer to the first facing of the base block than the separate portions. 36. The brake fluid pressure control unit as claimed in claim 30, wherein the base block includes an outside surface in which the cylinder bore is formed, and wherein the fixing means is provided in an annular region extending around the open end of the cylinder bore between the outside surface of the base block and the second portion of the cover member, the separate portions being spaced circumferentially from one another in the annular region by a plurality of plain regions, and the second portion of the cover member being clamped by the separate portions and not being clamped by the plain regions. 37. The brake fluid pressure control unit as claimed in claim 30, wherein each of the separate portions is a plastically deformed portion, and an annular region surrounding the open end of the cylinder bore being deformed only at the separate portions without being deformed entirely around the open end. 38. A brake fluid pressure control unit for a vehicle, the brake fluid pressure control unit comprising: a piston received slidably in a bore extending axially from a first bore end to a second bore end; a coil spring disposed in the bore, the coil spring including a first spring end and a second spring end abutting against the piston; a base block of aluminum material, including an outside surface, the bore being formed in the base block, the first bore end of the bore being open to an outside surface of the base block, the base block further comprising a shoulder surface formed around the bore and extending radially into the base block, and a fixing portion; and a cover member of aluminum material, fixed to the base block to cover the first bore end opening to the outside surface of the base block, the cover member including an end wall supporting the first spring end of the coil spring, and an outward flange clamped between the shoulder surface and the fixing portion of the base block of aluminum material, wherein the outward flange is formed at one end of the cover member, and bounded by an annular end surface facing toward the piston, the cover member extends axially from the end wall toward the piston and terminates at the annular end surface, and the annular end surface of the cover member abuts on the shoulder surface of the base block and projects radially inward in the bore; and wherein the fixing portion of the base block comprises a plurality of separate portions, non-continuous from one another, arranged around the first bore end of the bore, and spaced from one another. 39. The brake fluid pressure control unit as claimed in claim 38, wherein the outside surface of the base block is a lower surface which faces downward when the base block is installed in a vehicle; and the cover member projects downward from the lower surface of the base block such that the cover member is exposed to the outside of the base block. 40. The brake fluid pressure control unit as claimed in claim 38, wherein the cover member projects outward from the outside surface of the base block such that a majority of the cover member projects outwards from the outside surface of the base block. 41. The brake fluid pressure control unit as claimed in claim 38, wherein the cover member extends from a first end defined by the end wall and located outside the base block, to a second end defined by the outward flange and located inside the base block, and the cover member projects outward from the outside surface of the base block so that a distance between the first end of the cover member and the outside surface of the base block is greater than a distance between the second end of the cover member and the outside surface of the base block. 42. The brake fluid pressure control unit as claimed in claim 38, wherein the outward flange has a greater outer diameter than a wall of the cover member projecting outward from the outside surface of the base block. 43. The brake fluid pressure control unit as claimed in claim 38, wherein the piston and the cover member are spaced apart axially from each other by the coil spring. 44. The brake fluid pressure control unit as claimed in claim 38, wherein the piston includes a piston end wall, and a cylindrical wall extending axially from the piston end wall to an annular piston end surface facing away from the piston end wall so that the piston is bounded axially between the piston end wall and the annular piston end surface; and the annular end surface of the cover member axially faces toward the annular piston end surface of the piston and limits axial movement of the piston. 45. The brake fluid pressure control unit as claimed in claim 38, wherein the base block includes an inside cylindrical surface defining the bore and extending axially from a first axial end to a second axial end in the shape of a right circular cylinder so that an inside diameter of the inside cylindrical surface is constant from the first axial end to the second axial end; and wherein an axial length of the inside cylindrical surface between the first axial end and the second axial end is longer than an axial length of the piston, so that the piston can reciprocate axially between the first and second axial ends of the inside cylindrical surface of the base block. 46. The brake fluid pressure control unit as claimed in claim 38, wherein the cover member projects outward from the outside surface of the base block. 47. The brake fluid pressure control unit as claimed in claim 38, wherein each of the separate portions is an annular projection projecting radially inward around the first bore end of the bore, and wherein the separate portions are spaced from one another with intervening gaps so that the separate portions and the gaps are arranged alternately around the first bore end of the bore. 48. The brake fluid pressure control unit as claimed in claim 38, wherein the separate portions are arc-shaped portions, and are spaced circumferentially from one another by a plurality of plain regions having no fixing portion so that the separate portions and the plain regions are arranged alternately around the first bore end of the bore. 49. The brake fluid pressure control unit as claimed in claim 48, wherein the plain regions are arc-shaped, and the separate portions and the plain regions are arranged alternately in a circle around the first bore end of the bore. 50. The brake fluid pressure control unit of claim 49, further comprising a pump driving motor mounted to a first facing of the base block and the bore formed in a second facing of the base block, wherein the plain regions are positioned closer to the first facing of the base block than the separate portions. 51. The brake fluid pressure control unit as claimed in claim 38, wherein the base block includes an outside surface in which the bore is formed, and wherein the fixing portion is provided in an annular region extending around the first bore end of the bore between the outside surface of the base block and the outward flange of the cover member, the separate portions of the fixing portion being spaced circumferentially from one another in the annular region by a plurality of plain regions, and the outward flange of the cover member being clamped by the separate portions and not being clamped by the plain regions. 52. The brake fluid pressure control unit as claimed in claim 38, wherein each of the separate portions is a plastically deformed portion, and an annular region surrounding the first bore end of the bore being deformed only at the separate portions without being deformed entirely around the first bore end. 53. The brake fluid pressure control unit as claimed in claim 52, wherein the separate portions are formed by staking. 54. A method of manufacturing a brake fluid pressure control unit for a vehicle, the brake fluid pressure control unit comprising: a base block of aluminum material, formed with a cylinder bore extending axially from a bottom end to an open end; a piston received slidably in the cylinder bore and shaped to divide the inside of the cylinder bore into a fluid chamber and an atmospheric chamber; a cover member extending axially from an open end to a closed end, having an outward flange with a tapered surface projecting radially outward in a direction toward the bottom end of the cylinder bore, formed with a vent hole opening into the atmospheric chamber, and made of aluminum material; a bias member disposed between the piston and the cover member and arranged to urge the piston toward the bottom end of the cylinder bore; the manufacturing method comprising: forming an annular recessed receiving portion, for receiving the outward flange of the cover member, extending radially into the base block around the open end of the cylinder bore; setting the outward flange formed at the open end of the cover member of aluminum material in the receiving portion of the base block of aluminum material so that an annular end surface of the cover member defining the outward flange projects in the cylinder bore and axially faces toward an end of the piston; and fixing the cover member to the base block by deforming the receiving portion of the base block plastically to directly clamp the outward flange of the cover member. 55. The method of manufacturing as claimed in claim 54, wherein the step of forming a receiving portion further comprises forming an annular shoulder portion in the annular recessed receiving portion and a fixing portion that projects radially inward towards a center of the cylinder bore, and wherein the step of fixing the cover member further comprises deforming the fixing portion to directly clamp the outward flange between the annular shoulder portion and the fixing portion.
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