| 摘要 |
A seat suspension system (10) for a vehicle seat includes a lower support (14) securable in a stationary relationship with a vehicle body, an upper support (12) arranged generally above the lower support for supporting a vehicle seat, and a cooperating pair of elongated arm assemblies (16, 18) which each have opposite ends pivotally connected at opposite ends thereof to a corresponding one of the upper and lower supports so that the upper support is vertically movable with respect to the lower support. Various solutions are provided for reduction of vibration transmitted from the lower support to the upper support so that the vibration is not noticeably encountered by an occupant of a seat mounted to the seat suspension. In one embodiment, the upper and lower arm assemblies (16, 18) are braced by diagonal bracing (28) or with overlying plates (64) or with tubular side arms (70). In another embodiment, low friction bearings (32) are provided in the pivotal joints between the elongated arm assemblies and the upper and lower supports (14). In another embodiment, a shock absorber (44) is mounted at one end to the lower support transversely with respect to the movement between the upper and lower supports and is connected at another end to one of the upper support and one of the arm assemblies through a link (46) which translates vertical motion o the upper support or rotational movement of the arm assembly into transverse movement of the other end of the shock absorber. In yet another embodiment, an air spring (20) is mounted between the upper support (12) and one of the arm assemblies (16) to cushion the movement of the upper support (12) with respect to the lower support (14) and has a body of liquid which is connected to a pump for selectively changing the volume of liquid in the air spring to selectively adjust the height of the upper support with respect to the lower support, and control the natural frequency of vertical vibration of the assembly. |
