Abstract: A diaphragm device comprising: a supporting member; a flexible membrane that is supported by the supporting member; and a housing that accommodates the flexible membrane and the supporting member, and wherein the flexible membrane air-tightly separates a first chamber and a second chamber connected to the outside through a through-hole formed in a membrane supporting portion of the supporting member, inside the housing, wherein an avoidance recessed portion to avoid interference with an opening edge of the through-hole is formed at a position corresponding to the through-hole in the flexible membrane, wherein the avoidance recessed portion is provided at a thick portion thicker than the other portion of the flexible membrane, and the thick portion protrudes toward the first chamber.

Abstract: A diaphragm device comprising: a supporting member; a flexible membrane that is supported by the supporting member; and a housing that accommodates the flexible membrane and the supporting member, and wherein the flexible membrane air-tightly separates a first chamber and a second chamber connected to the outside through a through-hole formed in a membrane supporting portion of the supporting member, inside the housing, wherein an avoidance recessed portion to avoid interference with an opening edge of the through-hole is formed at a position corresponding to the through-hole in the flexible membrane, wherein the avoidance recessed portion is provided at a thick portion thicker than the other portion of the flexible membrane, and the thick portion protrudes toward the first chamber.

Abstract: A pressure control reservoir includes a valve ball and a shaft which is movable to move the valve ball to open or close a fluid path leading to a fluid reservoir chamber. The shaft has a tip with a slant surface which has a peripheral edge of a polygonal shape with even numbers of vertices and is inclined to the longitudinal center line of the shaft. Such a polygonal geometry increases an entire or inclined length of the slant surface, which results in an increased range where an angle which the slant surface makes with a plane extending perpendicular to an axial direction of the tip is permitted to be increased without causing the point of contact between the valve ball and the slant surface to be shifted close to the tip of the slant surface when the tip of the shaft moves the valve ball.

Abstract: A pressure control reservoir includes a valve ball and a shaft which is movable to move the valve ball to open or close a fluid path leading to a fluid reservoir chamber. The shaft has a tip with a slant surface which has a peripheral edge of a polygonal shape with even numbers of vertices and is inclined to the longitudinal center line of the shaft. Such a polygonal geometry increases an entire or inclined length of the slant surface, which results in an increased range where an angle which the slant surface makes with a plane extending perpendicular to an axial direction of the tip is permitted to be increased without causing the point of contact between the valve ball and the slant surface to be shifted close to the tip of the slant surface when the tip of the shaft moves the valve ball.

Abstract: A diaphragm device that supports a diaphragm with sandwiching an annular attaching portion, in an axis direction, provided at outer circumference of a flexible film by the support member having a diaphragm mounting portion, wherein at least three protrusions are provided at an outer circumference of the annular attaching portion, and each of the at least three protrusions equally protrudes in a radial direction, and wherein when the annular attaching portion is compressed in the axis direction, each of the at least three protrusions contacts with an inner circumference of the diaphragm mounting portion which faces an outer circumference of the annular attaching portion.

Abstract: Disclosed is a diaphragm having a flexible film portion and an outer peripheral flange portion integrally provided on the peripheral edge of the film portion, said outer peripheral flange portion being provided between and held by a first housing and a second housing, wherein the film portion is prevented from rising upward when the diaphragm is attached to the housings. The outer peripheral flange portion has a first pressed surface which is one surface of the diaphragm in the thickness direction and which is in close contact with the first housing, and a three-dimensional shape composed of a projected portion or a recessed portion, on the first pressed surface. When the outer peripheral flange portion is attached to the first housing and the second housing while being compressed and deformed therebetween, the three-dimensional shape defines voids in the thickness direction between the outer peripheral flange portion and the first housing.

Abstract: A pressure regulating reservoir includes, first and second conduits, a reservoir chamber, first and second reservoir ports, a valve portion including a first hydraulic passage, first and second valve bodies, and a valve seat including a second hydraulic passage, a piston portion including a piston and a spring, a mobile member, a protruding portion and a shaft, wherein the first hydraulic passage is closed by the second valve body thereby interrupting the fluid communication when the pump is not actuated, a pressure difference between a brake hydraulic pressure within the reservoir chamber and a brake hydraulic pressure within the first reservoir port is regulated when the pump is actuated while the brake hydraulic pressure is generated by the brake hydraulic pressure generating means, and the second hydraulic passage is opened to establish the fluid communication when the pump is actuated while no brake hydraulic pressure is generated.

Abstract: A pressure regulating reservoir includes, first and second conduits, a reservoir chamber, first and second reservoir ports, a valve portion including a first hydraulic passage, first and second valve bodies, and a valve seat including a second hydraulic passage, a piston portion including a piston and a spring, a mobile member, a protruding portion and a shaft, wherein the first hydraulic passage is closed by the second valve body thereby interrupting the fluid communication when the pump is not actuated, a pressure difference between a brake hydraulic pressure within the reservoir chamber and a brake hydraulic pressure within the first reservoir port is regulated when the pump is actuated while the brake hydraulic pressure is generated by the brake hydraulic pressure generating means, and the second hydraulic passage is opened to establish the fluid communication when the pump is actuated while no brake hydraulic pressure is generated.