Abstract:
Bending deformation exceeding a yield stress is applied by winding a material for a coil spring on a mandrel at a temperature at which spring-back occurs. Coiling is performed simultaneously with the application of the bending deformation, and the load is removed after the coiling. This spring includes an outside surface region (W3) having a compressive residual stress and a compressive stress reduction region (W4) in which the compressive residual stress is reduced from the outside surface region (W3) toward the center of the material. A stress change portion (P1) at which a change from the compressive residual stress to a tensile residual stress occurs exists between the outside surface region (W3) and the center of the material. The spring further includes a tensile stress peak portion (P2), tensile stress reduction region (W5), and inside surface region (W6). The inside surface region (W6) has the tensile or compressive residual stress having an absolute value smaller than that of the outside surface region (W3).
Abstract:
A suspension coil spring includes a lower end turn portion (42), an upper end turn portion (44), and a helical effective portion (45) formed between the end turn portions (42, 44). The lower end turn portion (42) includes a first portion (42a) which contacts a lower spring seat irrespective of a load, and a second portion (42b) which contacts the lower spring seat or is separated from the same according to the load. The wire diameter of the second portion (42b) is greater than that of the first portion (42a) and an average wire diameter of the effective portion (45). The upper end turn portion (44) includes a third portion (44a) which contacts an upper spring seat irrespective of a load, and a fourth portion (44b) which contacts the upper spring seat or is separated from the same according to the load. The wire diameter of the fourth portion (44b) is greater that of the third portion (44a) and the average wire diameter of the effective portion (45).
Abstract:
A knee-action-type suspension (11) is provided with an arm member (20), a compression coil spring (21), and a shock absorber (24). The arm member (20) is supported in such a way that it is pivotable in the upward and downward directions by a pivot (31) provided on an arm mounting portion (30). The coil spring (21) is arranged between spring seats (22, 23). The coil spring (21) is extended and retracted between a full-rebound state and a full-bump state in accordance with the magnitude of a load applied to a vehicle body. A wire (40) of the coil spring (21) includes a large-diameter wire portion (40a), a small-diameter wire portion (40b), and a wire diameter varying portion (40c). The large-diameter wire portion (40a) is provided in a first portion (21a) of the coil spring (21), which is on the side near to the pivot (31). The small-diameter wire portion (40b) is provided in a second portion (21b) of the coil spring (21), which is on the side far from the pivot (31). A wire diameter (d1) of the large-diameter wire portion (40a) is greater than a wire diameter (d2) of the small-diameter wire portion (40b).
Abstract:
A strut-type suspension (11) includes a compression coil spring (12), a lower spring seat (13), an upper spring seat (14), and a shock absorber (15) which passes through the inside of the compression coil spring (12). The compression coil spring (12) is disposed at a position offset to the outer side of a vehicle with respect to the shock absorber (15). The compression coil spring (12) is mounted in a vehicle body (30) in such a state that it is compressed between spring seats (13, 14). The compression coil spring (12) includes a large-diameter wire portion (40a) and a small-diameter wire portion (40b). The large-diameter wire portion (40a) is provided in a vehicle inner-side portion (12a) of the compression coil spring (12). The small-diameter wire portion (40b) is provided in a vehicle outer-side portion (12b). A wire diameter (d1) of the large-diameter wire portion (40a) is greater than a wire diameter (d2) of the small-diameter wire portion (40b).
Abstract:
An object is to provide a coil antenna that is adaptable to a thin figure, and that appropriately makes the ratio of self-inductance to mutual inductance further large, so as to achieve a comparatively small mutual inductance that results in small mutual interaction even when overlapped. Without using a component such as a chip coil, a winding pattern (14) is formed with a wire (16) with which a main wiring pattern (12) is formed. This enables to deal with the flexibility by realizing a thin product using a coil antenna (10). Further, the wiring pattern is designed such that the winding pattern (14) is provided and distributed to the main wiring pattern (12) forming a loop, and is formed with the wire (16) so as to have a wound shape small enough compared with the main wiring pattern (12). In this way, the ratio of the self-inductance to the mutual inductance is appropriately made further large, so that the mutual inductance is made comparatively small.