Shock absorber

1. A shock absorber with a pilot chamber, comprising:

a housing that constitutes the pilot chamber and includes a pilot hole and an inflow passage;

a pilot disk valve body that is disposed at an outer side of a bottom portion of the pilot hole, the pilot disk valve body being open when a pressure of the pilot chamber is greater than or equal to a preset value such that a fluid inside the pilot chamber is discharged outside via the pilot hole; and

a check valve body that allows the fluid to flow into the pilot chamber through the inflow passage,

wherein both the pilot hole and the inflow passage are formed in a bottom portion of the housing,

wherein the check valve body is disposed on an inner side of a bottom portion of the pilot chamber inside the pilot chamber, and

wherein the inflow passage comprises an inflow hole which is located at a radially outer portion than an insertion hole from a center of the housing.

2. The shock absorber according to claim 1 , wherein the check valve body comprises:

a valve main body disposed in the housing so as to cover the inflow passage;

a valve holding portion connected to the housing so as to hold a position of the check valve body; and

a connection portion that connects the valve main body to the valve holding portion.

3. The shock absorber according to claim 2 , wherein the housing includes a holding member, and the valve holding portion of the check valve body is disposed between the bottom surface and the holding member.

4. The shock absorber according to claim 3 , wherein a cutout portion is formed between the valve main body and valve holding portion of the check valve body so as to correspond to the pilot hole.

5. The shock absorber according to claim 1 , further comprising:

a spool guide inserted into the insertion hole of the housing;

a spool adapted to be slidable in the spool guide; and

a solenoid adapted to apply a force so as to move the spool,

wherein the spool guide has a first passage that communicates with at least one of the pilot chamber and a main passage for supplying a fluid to the pilot chamber.

6. The shock absorber according to claim 5 , wherein when the spool opens the first passage of the spool guide, a part of a fluid flowing through the main passage flows into the spool guide through the first passage and is discharged outside from the spool guide through a second passage formed in the spool guide.

7. The shock absorber according to claim 1 , wherein the inflow passage is located at a radially outer portion than the pilot hole from the center of the housing.

8. The shock absorber according to claim 2 , wherein the valve main body of the check valve body is seated around the inflow passage.

9. The shock absorber according to claim 1 , wherein the check valve body is of a disk type.

10. The shock absorber according to claim 1 , wherein the check valve body is of a spring loaded ball type.

11. A shock absorber with a pilot chamber, comprising:

a housing that constitutes the pilot chamber and includes a pilot hole and an inflow passage;

a pilot disk valve body that is disposed at an outer side of a bottom portion of the pilot hole, the pilot disk valve body being open when a pressure of the pilot chamber is greater than or equal to a preset value such that a fluid inside the pilot chamber is discharged outside via the pilot hole; and

a check valve body that allows the fluid to flow into the pilot chamber through the inflow passage,

wherein both the pilot hole and the inflow passage are formed in a bottom portion of the housing,

wherein the check valve body is disposed on an inner side of a bottom portion of the pilot chamber inside the pilot chamber, and

wherein the inflow passage comprises an inflow hole which is located at a radially outer portion than an insertion hole and the pilot hole from a center of the housing.