Spring devices – Vehicle – Leaf
Patent
1986-06-23
1988-08-09
Reese, Randolph A.
Spring devices
Vehicle
Leaf
267158, 267260, 267270, F16F 118, F16F 126, F16F 136
Patent
active
047623071
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL DOMAIN
The invention is concerned with a leaf spring of plastic material, which at least at one end is joined to a spring eye body. Furthermore, it is concerned with an advantageous method for the manufacture of such a leaf spring of plastic material.
STATE OF THE ART
A plastic material leaf spring of the aforesaid type is known from the European Patent Application No. 83109842.1 (Publication No. 106249). In this known leaf spring, the spring end is fastened in a slot of the spring eye body by means of screws which extend through borings in the spring end. However, these borings bring about an unwelcome mechanical weakening of the spring end.
DESCRIPTION OF THE INVENTION
The objective of the invention is, to begin with, to present a leaf spring of plastic material in which the spring eye bodies are fastened at the spring ends in such a manner that a mechanical weakening of the spring ends is avoided.
This problem is solved in the plastic material leaf spring according to the invention, which is characterized by that the body of the spring is provided at least at one of the spring ends with a thickening at which one end zone of the spring body increases in thickness towards the spring end, by that the mounting zones, of laminar design in appropriate circumstances, adjoin the top and bottom sides of this end zone of the spring body, and by that at least one clamping sleeve is provided slipped over the spring body's end zone and over the mounting zones adjoining it, which clamping sleeve wedges these mounting zones onto the spring body's end zone, and which can advantageously be secured against displacement relative to the mounting zones, appropriately by means of screws or pins. The spring eye body may advantageously support itself against the blunt spring end.
In an advantageous embodiment of the invention, the leaf spring according to the invention is characterized by that the spring eye body has at least two parts separated from each other, which with their mounting zones adjoin the top and bottom side of the spring body's end zone, respectively.
According to another advantageous embodiment of the invention, the plastic material leaf spring has mounting zones which, at their pressure surfaces adjoining the end zone of the spring body, exhibit a relief-like surface structure, appropriately formed by grooves, into the recesses of which the plastic material of the spring body has penetrated.
According to additional advantageous embodiments of the plastic leaf spring according to the invention, it exhibits two clamping sleeves which are slipped and wedged onto the same pair of mounting zones or onto different pairs of mounting zones.
In another advantageous embodiment of the invention, the plastic leaf spring according to the invention is characterized by that the spring eye body exhibits a bent strip of steel or of fiber-reinforced plastic material, which in partial zones, appropriately its end zones, comprises the mounting zones to be wedged onto the end zone of the spring body. Advantageously, this piece of strip is joined to a spring eye bushing, which latter is braced directly or through an intermediate layer on the top or bottom side of the spring body's end zone, in which case the spring eye bushing can advantageously be arranged between the two clamping sleeves, or otherwise it advantageously braces itself against the blunt spring end.
According to a further advantageous embodiment of the plastic leaf spring according to the invention, it is characterized by that the bent piece of strip fits closely against a part of the surface of the spring bushing.
In another advantageous embodiment of the invention, the plastic leaf spring according to the invention is characterized by that the bent piece of strip is connected to the spring eye bushing form-lockingly and/or frictionally.
According to a last advantageous embodiment of the invention, the plastic leaf spring according to the invention exhibits a spring eye body with two pieces of strip of steel or of fiberreinforced plastic material,
REFERENCES:
patent: 4411159 (1983-10-01), Spear et al.
patent: 4505460 (1985-03-01), LeGallais
patent: 4562998 (1986-01-01), Ward
Isoport Verbundbauteile G.m.b.H.
Reese Randolph A.
Ricci John A.
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