A air spring 10 is provided, where flex deformation of a shoulder portion in a dustcover due to the restorative force of a bellows portion during compression thereof is prevented, whereby deterioration of the life of the dustcover due to such deformation is prevented. With the air spring 10 , a stopper 82 of a deformation-preventing cap 70 is arranged at the outer peripheral side of a shoulder portion 54 in a dustcover 50 . At the time of compression deformation of a bellows portion 56 , the stopper 82 comes into contact with the shoulder portion 54 , and flex deformation of the shoulder portion 54 towards a linking tube 52 side is restricted. Due to this, the restorative force from the compression deformed bellows portion 56 via the shoulder portion 54 can be supported by the stopper 82 of the deformation-preventing cap 70 . Even in a case where the rigidity of the shoulder portion 54 relative to the restorative force of the compression deformed bellows portion 56 cannot be sufficiently increased, the amount of flex deformation towards the linking tube side of the shoulder portion 54 that received the restorative force of the bellows portion 56 can be decreased.
1. An air spring comprising:
a chamber component linked to one of a support body and a movable body;
a piston component linked to the other of the support body and the movable body;
a diaphragm formed in a substantially cylindrical shape and set in a state in which the inside and outside thereof at a middle portion are reversed, one end portion and another end portion are linked, respectively, to the chamber component or the piston component, and a chamber is formed at the interior of the diaphragm;
a dustcover that is arranged at an outer peripheral side of the diaphragm and that is provided with a linking tube fixed to an outer peripheral side of the chamber component at an upper end thereof, the dustcover being integrally provided with a shoulder portion that extends from a lower end portion of the linking tube to an outer peripheral side and a tubular bellows portion that extends downward from a lower end portion of the shoulder portion and is extendable and retractable along a direction of movement of the movable body; and
a deformation-preventing component that is arranged at an outer peripheral side of the shoulder portion and that comes into contact with the shoulder portion when the bellows portion is compression deformed, and restricts elastic deformation of the shoulder portion towards the linking tube side,
wherein the deformation-preventing component is provided with a linking portion fixed to the chamber component at an upper end portion of the deformation-preventing component, and is provided with a stopper that extends from a lower end portion of the linking portion towards the outer peripheral side of the shoulder portion and faces the shoulder portion.
2. The air spring of claim 1 , wherein the stopper is provided so as to encircle the shoulder portion around the entire periphery from the outer peripheral side.
3. The air spring of claim 1 , wherein the stopper is provided so as to face a portion along the peripheral direction at the shoulder portion from the outer peripheral side.
4. The air spring of claim 1 , wherein a load disperser is formed at the stopper and extends from the lower end portion thereof to the outer peripheral side.
5. The air spring of claim 4 , wherein the load disperser is formed in order to expand the area of contact between the stopper and the shoulder portion at the time of compression-deformation of the bellows portion.
6. An air spring comprising:
a chamber component linked to one of a support body and a movable body;
a piston component linked to the other of the support body and the movable body;
a diaphragm formed in a substantially cylindrical shape and set in a state in which the inside and outside thereof at a middle portion are reversed, one end portion and the other end portion are linked, respectively, to the chamber component or the piston component, and a chamber is formed at the interior of the diaphragm;
a dustcover that is arranged at an outer peripheral side of the diaphragm and that is provided with a linking tube fixed to an outer peripheral side of the chamber component at an upper end thereof, the dustcover also being provided with a shoulder portion that extends from a lower end portion of the linking tube to an outer peripheral side and
a tubular bellows portion that extends downward from a lower end portion of the shoulder portion and is extendable and retractable along a direction of movement of the movable body,
wherein the linking tube and the shoulder portion are integrally formed and the bellows portion is formed separately from the linking tube and the shoulder portion, and the dustcover is configured to link an upper end portion of the bellows portion to the lower end portion of the shoulder portion,
wherein a load disperser is formed at the lower end portion of the shoulder portion so as to extend towards an inner peripheral side in order to expand the area of contact between the shoulder portion and the bellows portion.
7. The air spring of claim 6 , wherein the bellows portion is formed from an elastic material and the linking tube and the shoulder portion are formed from a material having a specific intensity greater than that of the bellows portion.
8. The air spring of claim 6 , wherein a tubular linking portion that is fit onto an outer peripheral side of the lower end portion of the shoulder portion is formed at the upper end portion of the bellows portion, and the air spring further comprises a band component provided at the dustcover that is wound around from an outer peripheral portion of the linking portion and that tightens and fixes the linking portion to the lower end portion of the shoulder portion.
9. An air spring comprising:
a chamber component linked to one of a support body and a movable body;
a piston component linked to the other of the support body and the movable body;
a diaphragm formed in a substantially cylindrical shape and set in a state in which the inside and outside thereof at a middle portion are reversed, one end portion and the other end portion are linked, respectively, to the chamber component or the piston component, and a chamber is formed at the interior of the diaphragm;
a dustcover that is arranged at an outer peripheral side of the diaphragm and which is provided with a linking tube fixed to an outer peripheral side of the chamber component at an upper end thereof; is provided with a shoulder portion that extends towards an outer peripheral side from a lower end portion of the linking tube, and a circular tube that extends from a lower end side of the shoulder portion, and is further provided with a tubular bellows portion that extends downward from a lower end portion of the circular tube and can expand and contract along a direction of movement of the movable body,
wherein the linking tube, the shoulder portion, and the circular tube are integrally formed, the bellows portion is formed separately from the linking tube, the shoulder portion, and the circular tube, and the dustcover is configured to link an upper end portion of the bellows portion to the circular tube,
wherein a load disperser that extends towards the outer peripheral side is formed at the lower end portion of the circular tube.
10. The air spring of claim 9 , wherein the bellows portion is formed from an elastic material and the linking tube, the shoulder portion, and the circular tube are formed from a material having a specific intensity greater than that of the bellows portion.
11. The air spring of claim 9 , wherein a tubular linking portion that is fit onto an outer peripheral side of the circular tube is formed at the upper end portion of the bellows portion, and the air spring further comprises a band component provided at the dustcover that is wound around from an outer peripheral side of the linking portion, and that tightens
and fixes the linking portion to the circular tube.
12. The air spring of claim 9 , wherein an outer peripheral side of the load disperser is curved downward.
13. The air spring of claim 12 , wherein a fitting portion that fits onto the load disperser from the outer peripheral side is formed at the bellows portion.
14. The air spring of claim 9 , wherein a slit is formed at the bellows portion from an upper end thereof in an axial direction at a position corresponding to the linking portion and the load disperser in an assembled state.