Pressure damping device for a fluid circuit

A pressure damping device for a fluid circuit, the device comprising:

• a lower body comprising fluid inlet and outlet ports which are connected to a chamber located between the inlet and outlet ports, the body being formed in one single piece and the chamber comprising a first bottom,
• an upper cover attached to the body above the chamber, the cover comprising an internal cavity with a second bottom oriented towards the first bottom of the chamber,
• an elastically deformable membrane interposed between the body and the cover, the membrane being substantially circular in shape and comprising a central portion which has a constant thickness and a peripheral portion which is clamped between the body and the cover to ensure a seal between the chamber and the cavity,
• a circular cup arranged in the cavity and on the central portion of the membrane, and
• a spring interposed between the cup and the second bottom of the cavity,
• wherein the body comprises a support member for supporting the membrane, the support member projecting from the first bottom and comprising a free upper end on which the membrane is adapted to be supported,
• wherein:
• the member extends from the first bottom along a central axis to a member height which is less than or equal to a height of the chamber, the member having a circular outline and having an external diameter D3 measured with respect to said axis,
• the cup is centered on said axis and has an external diameter D10 measured with respect to said axis, with 0.8×D3<D10<1.2×D3, and
• the membrane is centered on said axis and the peripheral portion has a clamping internal diameter D1 measured with respect to said axis, with D1>1.5×D3, and
• wherein D3 is between 5 mm and 30 mm, or D1 is between 10 and 60 mm, or D10 is between 5 and 30 mm.

A pressure damping device for a fluid circuit, the device comprising:

• a lower body comprising fluid inlet and outlet ports which are connected to a chamber located between the inlet and outlet ports, the body being formed in one single piece and the chamber comprising a first bottom,
• an upper cover attached to the body above the chamber, the cover comprising an internal cavity with a second bottom oriented towards the first bottom of the chamber,
• an elastically deformable membrane interposed between the body and the cover, the membrane being substantially circular in shape and comprising a central portion which has a constant thickness and a peripheral portion which is clamped between the body and the cover to ensure a seal between the chamber and the cavity,
• a circular cup arranged in the cavity and on the central portion of the membrane, and
• a spring interposed between the cup and the second bottom of the cavity,
• wherein the body comprises a support member for supporting the membrane, the support member projecting from the first bottom and comprising a free upper end on which the membrane is adapted to be supported,
• wherein:
• the member extends from the first bottom along a central axis to a member height which is less than or equal to a height of the chamber, the member having a circular outline and having an external diameter D3 measured with respect to said axis,
• the cup is centered on said axis and has an external diameter D10 measured with respect to said axis, with 0.8×D3<D10<1.2×D3, and
• the membrane is centered on said axis and the peripheral portion has a clamping internal diameter D1 measured with respect to said axis, with D1>1.5×D3, and
• wherein said support member has a first height measured from said first bottom which is less than a second height of said chamber measured from said first bottom so that the membrane adopts a first shape in the deformed state when the membrane is supported on the free upper end of the support member, said first shape having a frustoconical portion which flares from said first bottom to the upper cover.