Damping valve for shock absorber

A damping valve for a shock absorber, comprising:

• a valve disk including a one-side disk and an other-side disk to be placed on the one-side disk, the valve disk partitioning one chamber and another chamber, the one-side disk having a mating surface mating with a mating surface of the other-side disk, each of the one-side disk and the other-side disk having an annular inner peripheral seat surface, and an annular outer peripheral seat surface, at an outer side of the inner peripheral seat surface, formed at corresponding positions of the respective mating surface;
• a port including through holes formed in the one-side and other-side disks and allowing communication between the one and the other chambers, the through holes each being open between each of the inner peripheral seat surfaces and each of the outer peripheral seat surfaces, a plurality of the through holes, which are in the other-side disk, extending from the inner peripheral seat surface of the other-side disk to the outer peripheral seat surface of the other-side disk;
• a shaft member penetrating through the valve disk;
• and
• a nut for fixing the valve disk to the shaft member by being threadably mounted on a tip of the shaft member, the nut being movable between first and second positions,
• wherein the other-side disk includes elastic deforming portions formed between the plurality of through holes of the other-side disk,
• wherein with the nut in the first position, the outer peripheral seat surface of the one-side disk and the outer peripheral seat surface of the other-side disk are in direct contact, while a clearance is formed between the inner peripheral seat surface of the one-side disk and the inner peripheral seat surface of the other-side disk, and
• wherein with the nut in the second position, the clearance is eliminated so that the inner peripheral seat surface of the one-side disk directly contacts the inner peripheral seat surface of the other-side disk.

A method for forming a damping valve for a shock absorber, comprising:

• providing
• a valve disk including a one-side disk and an other-side disk provided to be placed on the one-side disk, the one-side disk having a mating surface for mating with a mating surface of the other-side disk, each of the one-side disk and the other-side disk having an annular inner peripheral seat surface and an annular outer peripheral seat surface, which is at an outer side of the inner peripheral seat surface, formed at corresponding positions of the respective mating surface,
• a port including through holes formed in the one-side and other-side disks, a plurality of the through holes, which are in the other-side disk, extending from the inner peripheral seat surface of the other-side disk to the outer peripheral seat surface of the other-side disk,
• a shaft member penetrating through the valve disk, and
• a nut for fixing the valve disk to the shaft member,
• wherein the other-side disk includes elastic deforming portions formed between the plurality of through holes of the other-side disk;
• threadably mounting the nut on a tip of the shaft member;
• after the threadably mounting, tightening the nut to a first position, so that the outer peripheral seat surface of the one-side disk and the outer peripheral seat surface of the other-side disk are in direct contact, while a clearance is formed between the inner peripheral seat surface of the one-side disk and the inner peripheral seat surface of the other-side disk;
• and
• after the tightening, further tightening the nut to a second position so that the clearance is eliminated such that the inner peripheral seat surface of the one-side disk directly contacts the inner peripheral seat surface of the other-side disk, wherein the valve disk partitions one chamber and another chamber, the port allows for communication between the one and the other chambers, and each of the through holes of the port are open between each of the inner peripheral seat surfaces and each of the outer peripheral seat surfaces.