coil spring
A technology of coil springs and spring materials, applied in the field of coil springs, can solve problems such as uneven stress distribution of coil springs, and achieve the effects of light weight, reduced deviation, and high torque transmission efficiency
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no. 1 approach
[0038] [Disposition and structure of coil spring]
[0039] First, the arrangement and structure of the coil spring of this embodiment will be described. figure 1 It is a schematic side view of a vehicle seat in which a coil spring according to the present embodiment is disposed in a forward-tilted state. figure 2 yes figure 1 An enlarged view of the interior of circle II. image 3 It is a schematic side view of a vehicle seat in a reclined state equipped with the same coil spring. Figure 4 for image 3 An enlarged view of the interior of circle IV.
[0040] Such as figure 1 , image 3 As shown, the vehicle seat 8 has a seat cushion 80 (indicated by a dot-dash line for convenience of description) and a seat back 81 (indicated by a dot-dash line for convenience of description). The seat cushion 80 has a plate-like cushion frame 800 made of steel. A pair of cushion frames 800 are arranged on the left and right sides. Cushion frame 800 is attached to a vehicle floor (no...
no. 2 approach
[0056] The coil spring of this embodiment differs from the coil spring of the first embodiment in that a contact inducing member is arranged. Only the differences are described here. Figure 8 It is a side view of the coil spring which concerns on this embodiment in the reclining state. Also, use the same notation as Figure 4 corresponding parts.
[0057] Such as Figure 8 As shown, the contact inducing member 23 is arranged on the inner side of the scroll portion 21 in the radial direction. The contact inducing member 23 has a round rod shape (needle shape) with a short axis. The contact induction member 23 contacts the wrap portion 21 from the radially inner side. The inner reference portion D is arranged at the junction of the contact induction member 23 and the wrap portion 21 .
[0058] The portion of the coil spring 1 of the present embodiment having the same structure as that of the coil spring 1 of the first embodiment has the same effect. In addition, accordin...
Embodiment example
[0068] Next, explain the relative Figure 4 The coil spring 1 of the first embodiment shown has the results of FEM (finite element analysis) analysis performed on a coil spring (Example 1) of the same shape.
[0069]
[0070] Analysis is performed using commercially available software. In the analysis process, it is also necessary to consider the contact between the spring material S and the objects (the inner object 3 and the outer object 4 ) and the contact between the spring materials.
[0071]
[0072] Figure 9 The relationship between the position of the inner contact portion and the stress increase rate in the maximum deformation state in Example 1 is shown. In addition, the so-called stress increase rate is the maximum value of the stress of the coil spring 1 when the stress design value is 100%. When the moment is M, the lateral width (band width) of the spring material S is b, and the plate thickness of the spring material S is h, the design value σ is calcula...
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