Patent ID: 7574860
Filing Date: 2009-08-18
Classification: B62D,F16F,Y10T

Abstract:
1. A damper valve comprising: a casing having a first chamber, a second chamber, and a partition wall for separating the first chamber and the second chamber from each other; a supply path for supplying hydraulic oil in the first chamber to the second chamber; a return path for returning the hydraulic oil in the second chamber to the first chamber; a check valve provided in the supply path for regulating circulation of the hydraulic oil from the second chamber to the first chamber; a valve seat provided on the partition wall and facing the first chamber; an annular valve plate, which is elastically deformable, accommodated in the first chamber and opposed to the valve seat; and an urging member for urging a predetermined portion of the valve plate toward the valve seat, wherein the supply path comprises a penetration path that penetrates the partition wall along a predetermined axis, the return path comprises a communication path that communicates the first chamber and the second chamber with each other by penetrating the partition wall, the communication path has an opening formed on the valve seat, the valve plate produces an elasticity restoring force so as to establish a balance between an urging force provided by the urging member, and a reaction force provided by the valve plate, the valve plate is in line contact with the valve seat when keeping the balance, and either one of the valve seat or the valve plate is formed into a conical tapered shape centered around the predetermined axis so that when either one of an outer edge or an inner edge of the valve plate is abutted against the valve seat, an annular oil chamber is formed between the valve seat and the valve plate and the opening of the communication path communicating with the annular oil chamber.