Spring rubber seat and strut-type suspension

1. A spring rubber seat configured to fit between a spring formed of a wound wire rod to elastically support a chassis and a lower spring seat having a flat catch tray, the spring rubber seat configured to fit along the catch tray, comprising:

a seat portion having an arc shape and having a seat surface where the spring is seated; and

a link portion that links one circumferential end with the other circumferential end of the seat portion to make the spring rubber seat in an annular shape,

wherein the link portion has

a first link portion connected to the other end of the seat portion, and

a second link portion connected to the first link portion and one end of the seat portion, and

the first link portion has rigidity lower than that of the second link portion.

2. The spring rubber seat according to claim 1 , wherein the rigidity of the first link portion is set to be lower than that of the second link portion by forming the first link portion to be thinner than the second link portion.

3. The spring rubber seat according to claim 2 , wherein the first link portion has a thinnest portion, and

the first link portion has a thickness increasing from the thinnest portion to the other end of the seat portion, the thickness increasing from the thinnest portion to the second link portion.

4. The spring rubber seat according to claim 3 , wherein a distance from the thinnest portion to a boundary between the first and second link portions is longer than a distance from the thinnest portion to the other end of the seat portion.

5. The spring rubber seat according to claim 1 , wherein the seat portion has

a non-sloped portion having no slope on the seat surface, and

a sloped portion having a slope on the seat surface,

the non-sloped portion is formed to extend from one end of the seat portion to a predetermined circumferential position of the seat portion,

the sloped portion is formed to extend from the predetermined position to the other end of the seat portion, and

the seat surface of the sloped portion has a height increasing toward the other end of the seat portion to be higher than a height of the seat surface of the non-sloped portion to match a shape of the spring.

6. The spring rubber seat according to claim 5 , further comprising a trench provided in the back side of the sloped portion to extend along a radial direction of the spring rubber seat in order to form a gap between the spring seat and the back side of the sloped portion.

7. The spring rubber seat according to claim 5 , wherein the spring rubber seat has a projection formed in the back side of the non-sloped portion, the projection being inserted into a hole of the spring seat.

8. The spring rubber seat according to claim 1 , wherein the spring rubber seat has a projection formed in a back side of the second link portion, the projection being inserted into a hole of the spring seat.

9. The spring rubber seat according to claim 1 , wherein a radial cross-sectional shape of the seat surface in the spring rubber seat is curved to match a cross-sectional shape of the wire rod of the spring, and

inner and outer circumferential edges of the seat surface are formed to be higher than a deepest portion of the seat surface.

10. The spring rubber seat according to claim 1 , wherein one end of the seat portion is provided with a stopper protruding upward from the seat surface, the stopper abutting on a leading end of the wire rod of the spring.

11. A strut-type suspension comprising:

the spring rubber seat according to claim 1 ; and

a shock absorber interposed between the chassis and a wheel, the shock absorber being provided with a cylindrical outer tube and a piston rod slidably inserted into the outer tube,

wherein the spring seat is fixed to an outer circumference of the outer tube to with radially protruding from the outer tube, and

the spring rubber seat is interposed between the spring and the spring seat.

12. The spring rubber seat according to claim 1 , wherein the link portion has

a first link portion connected to a terminated end of the seat portion, and

a second link portion connected to the first link portion and one end of the seat portion serving as a start point, and

the first link portion has rigidity lower than that of the second link portion.

13. The spring rubber seat according to claim 1 , wherein the catch tray of the spring seat is formed so as to be nearly horizontally in a state that a strut-type suspension provided with the spring seat is mounted on a vehicle.

14. A spring rubber seat configured to fit between a spring formed of a wound wire rod to elastically support a chassis and a lower spring seat having a flat catch tray, the spring rubber seat configured to fit along the catch tray, comprising:

a seat portion having an arc shape and having a seat surface where the spring is seated; and

a link portion that links one circumferential end with the other circumferential end of the seat portion to make the spring rubber seat in an annular shape,

wherein one end of the seat portion is provided with a stopper protruding upward from the seat surface, the stopper abutting on a leading end of the wire rod of the spring, and

the link portion is thinner than the other circumferential end of the seat portion and thinner than the stopper.

15. The spring rubber seat according to claim 14 , wherein the catch tray of the spring seat is formed so as to be nearly horizontally in a state that a strut-type suspension provided with the spring seat is mounted on a vehicle.

16. The spring rubber seat according to claim 14 , wherein the link portion has

a first link portion connected to a terminated end of the seat portion, and

a second link portion connected to the first link portion and one end of the seat portion serving as a start point, and

the first link portion has rigidity lower than that of the second link portion.