Pressure shock absorber and vehicle suspension including the same

1. A pressure shock absorber comprising:

a spring portion used for a suspension of a vehicle;

a hydraulic jack portion which can adjust a preload of the spring portion; and

a connecting portion through which a hydraulic pressure source supplying hydraulic pressure to the hydraulic jack portion is connected to the hydraulic jack portion,

wherein the connecting portion can be connected to and disconnected from the hydraulic pressure source,

a connecting plug is provided in the hydraulic jack portion as the connecting portion,

a connecting socket is provided in the hydraulic pressure source, said connecting socket being able to be directly connected to and disconnected from the connecting plug,

the connecting plug and the connecting socket are removably connected using a bayonet locking mechanism,

the hydraulic pressure source sets the preload, and

the hydraulic jack portion maintains the preload as the vehicle runs while the connecting socket is separated from the connecting plug.

2. The pressure shock absorber according to claim 1 ,

wherein, the hydraulic jack potion has an annular member and a piston portion which is fitted to an outside of the annular member and is movable in a same direction to the annular member,

the connecting portion is mounted to the piston portion,

a pressure chamber is formed between the annular member and the piston portion and can communicate with the hydraulic pressure source, and

the preload of the spring portion is adjusted by a pressure of the pressure chamber.

3. The pressure shock absorber according to claim 1 ,

wherein, the hydraulic jack portion has an annular housing to which the connecting portion is mounted and a piston portion which is fitted to the annular housing and is movable in a same axial direction as the annular housing,

a pressure chamber is formed between the annular housing and the piston portion and can communicate with the hydraulic pressure source, and

the preload of the spring portion is adjusted by a pressure of the pressure chamber.

4. The pressure shock absorber according to claim 1 ,

wherein the hydraulic jack portion has a piston portion pressing the spring portion, and the piston portion includes plural adjusting piston portions arranged annularly around a central axis line of the spring portion, and

the spring portion is pressed by the plural adjusting piston portions.

5. A pressure shock absorber comprising:

a body portion including a spring portion used for a suspension of a vehicle and a hydraulic jack portion which can adjust a preload of the spring portion; and

a hydraulic pressure source supplying hydraulic pressure to the hydraulic jack portion of the body portion,

wherein the body portion can be connected to and disconnected from the hydraulic pressure source through a connecting portion provided in the body portion,

a connecting plug is provided in the hydraulic jack portion as the connecting portion,

a connecting socket is provided in the hydraulic pressure source, said connecting socket being able to be directly connected to and disconnected from the connecting plug,

the connecting plug and the connecting socket are removably connected using a bayonet locking mechanism,

the hydraulic pressure source sets the preload, and

the hydraulic jack portion maintains the preload as the vehicle runs while the connecting socket is separated from the connecting plug.

6. A vehicle suspension comprising:

a pressure shock absorber including a spring portion used for a suspension of a vehicle, a hydraulic jack portion which can adjust a preload of the spring portion and a connecting portion through which a hydraulic pressure source supplying hydraulic pressure to the hydraulic jack portion is connected to and disconnected from the hydraulic jack portion,

wherein, after the preload of the spring portion is set by the hydraulic pressure source, a vehicle comprising the vehicle suspension is allowed to run with the pressure shock absorber in a state where the hydraulic pressure source is separated from the connecting portion,

a connecting plug is provided in the hydraulic jack portion as the connecting portion,

a connecting socket is provided in the hydraulic pressure source, said connecting socket being able to be directly connected to and disconnected from the connecting plug,

the connecting plug and the connecting socket are removably connected using a bayonet locking mechanism,

the hydraulic pressure source sets the preload, and

the hydraulic jack portion maintains the preload as the vehicle runs while the connecting socket is separated from the connecting plug.