Coil spring for suspension

Abstract

A coil spring includes a wire formed of spring steel shaped to be helical, and is compressed between an upper spring seat and a lower spring seat. The coil spring includes an upper portion and a lower portion. A positive pitch winding end portion is formed on the upper portion of the coil spring. A terminal-point-strong-abutting-portion is formed at a distal end of the winding end portion. The terminal-point-strong-abutting-portion is in contact with the upper spring seat at one point at a position deviated to an inner side of a vehicle with respect to a coil central axis. On the lower portion of the coil spring, an end turn portion which contacts the lower spring seat is formed at a position deviated to an outer side of the vehicle.

What is claimed is: 
     
         1 . A suspension coil spring which is formed of a helically wound wire, and is compressed between an upper spring seat and a lower spring seat, the suspension coil spring comprising:
 a winding end portion of a positive pitch provided at an upper portion of the wire,   a terminal-point-strong-abutting-portion provided at a distal end of the winding end portion, the terminal-point-strong-abutting-portion contacting the upper spring seat at one point at a position deviated away from a coil central axis in a radial direction of the coil; and   an end turn portion provided at a lower portion of the wire, the end turn portion contacting the lower spring seat at a position deviated to a side opposite to a side that the terminal-point-strong-abutting-portion.   
     
     
         2 . The suspension coil spring of  claim 1 , wherein the terminal-point-strong-abutting-portion contacts the upper spring seat at a position deviated to an inner side of a vehicle with respect to the coil central axis. 
     
     
         3 . The suspension coil spring of  claim 1 , wherein the positive pitch winding end portion has a pitch angle which allows a region extending to 0.4 turns from a distal end of the wire to contact the upper spring seat in a state where a load is applied. 
     
     
         4 . The suspension coil spring of  claim 2 , wherein the positive pitch winding end portion has a pitch angle which allows a region extending to 0.4 turns from a distal end of the wire to contact the upper spring seat in a state where a load is applied. 
     
     
         5 . The suspension coil spring of  claim 1 , wherein a protection tip is provided on the terminal-point-strong-abutting-portion, and the upper spring seat with which the protection tip comes into contact comprises a receiving portion. 
     
     
         6 . The suspension coil spring of  claim 2 , wherein a protection tip is provided on the terminal-point-strong-abutting-portion, and the upper spring seat with which the protection tip comes into contact comprises a receiving portion. 
     
     
         7 . The suspension coil spring of  claim 2 , wherein the end turn portion is formed at a position deviated to an outer side of the vehicle, and that the end turn portion has a negative pitch in a state where no compressive load is applied, and is deformed to have a positive pitch by being pressed by the lower spring seat in a state where a load is applied. 
     
     
         8 . The suspension coil spring of  claim 3 , wherein the end turn portion is formed at a position deviated to an outer side of the vehicle, and that the end turn portion has a negative pitch in a state where no compressive load is applied, and is deformed to have a positive pitch by being pressed by the lower spring seat in a state where a load is applied. 
     
     
         9 . The suspension coil spring of  claim 4 , wherein the end turn portion is formed at a position deviated to an outer side of the vehicle, and that the end turn portion has a negative pitch in a state where no compressive load is applied, and is deformed to have a positive pitch by being pressed by the lower spring seat in a state where a load is applied. 
     
     
         10 . The suspension coil spring of  claim 5 , wherein the end turn portion is formed at a position deviated to an outer side of the vehicle, and that the end turn portion has a negative pitch in a state where no compressive load is applied, and is deformed to have a positive pitch by being pressed by the lower spring seat in a state where a load is applied. 
     
     
         11 . The suspension coil spring of  claim 6 , wherein the end turn portion is formed at a position deviated to an outer side of the vehicle, and that the end turn portion has a negative pitch in a state where no compressive load is applied, and is deformed to have a positive pitch by being pressed by the lower spring seat in a state where a load is applied. 
     
     
         12 . A suspension coil spring which is formed of a helically wound wire, and is compressed between an upper spring seat and a lower spring seat, the suspension coil spring comprising:
 a winding end portion of a positive pitch provided at a lower portion of the wire,   a terminal-point-strong-abutting-portion provided at a distal end of the winding end portion, the terminal-point-strong-abutting-portion contacting the lower spring seat at one point at a position deviated to an outer side of a vehicle with respect to a coil central axis; and   an end turn portion provided at an upper portion of the wire, the end turn portion contacting the upper spring seat at a position deviated to an inner side of the vehicle.   
     
     
         13 . The suspension coil spring of  claim 12 , wherein a protection tip is provided on the terminal-point-strong-abutting-portion, and the lower spring seat with which the protection tip comes into contact comprises a receiving portion. 
     
     
         14 . The suspension coil spring of  claim 12 , wherein the positive pitch winding end portion has a pitch angle which allows a region extending to 0.4 turns from a lower end of the wire to contact the lower sprint seat in a state where a load is applied