RU2307743C2 - Leaf spring fastening device - Google Patents

Abstract

FIELD: automotive industry.

SUBSTANCE: invention relates to suspensions of trucks, particularly, to device for fastening leaf spring to support. Proposed device contains U-bolts enclosing spring, and cover plates installed between spring and U-bolts which are fixed by recesses of cover plate enclosing projections of spring upper leaf to prevent separation. Said projections of upper leaf of spring from side of cover plate and its recesses located opposite to projections are displaced from vertical axis of symmetry of U-bolt legs towards middle part of spring between vertical axes of symmetry of U-bolt legs. Surface of cover plate pointed to surface of spring upper leaf is made to radius whose center is displaced from vertical axes of symmetry of U-bolt legs to side far from vertical axis of symmetry of cover plate recess so that line of contact of cover plate surface and surface of upper leaf of spring should coincide with plane passing through vertical axes of symmetry of U-bolt legs.

EFFECT: increased service life of leaf spring.

1 dwg

Description

The invention relates to the field of transport engineering, namely to the suspension of trucks, in particular to devices for attaching a leaf spring to a support.

A device for attaching the middle part of a leaf spring to the support of the axis of the wheel of the car, containing two stepladders covering the spring, two pads and a restrictive bracket that is installed between the pads and the spring and keeps the stepladder from diverging [1]. The presence of a restrictive bracket leads to a complication in the manufacture and cost of a device for attaching a leaf spring.

There is also known a device for attaching the middle part of the leaf spring to the wheel axle support, selected as the closest analogue, containing two stepladders that press the spring to the support through two lining [2]. Pads have recesses. The last leaf of the spring is made with protrusions from the side of the plates, while the protrusions and recesses are combined.

The disadvantage of this design is that the vertical axis of symmetry of the recesses of the lining and the protrusion of the last leaf of the spring are on a plane passing through the vertical axis of symmetry of the branches of the ladder, and the surface of the lining facing the surface of the upper leaf of the spring is made along a radius whose center is on the vertical axis symmetry of the recess of the lining, which leads to low durability of the last leaf of the spring when it is loaded during the movement of the car.

The purpose of the invention is to increase the durability of the spring when it is loaded during the movement of the car.

To do this, in the device for attaching the leaf spring, the last leaf of the spring is made with protrusions on the side of the lining and with opposite recesses - on the other springs, the lining is made with recesses covering these protrusions, while the recesses of the linings and the protrusions of the last leaf of the spring are shifted to the central vertical the axis of the spring leaves: the recess of the lining and the protrusion of the last leaf of the spring covering the recess of the spring are not in the plane passing through the vertical axis of symmetry of the two branches of the ladder, and t Also, the surface of the lining facing the surface of the upper leaf of the spring is made along a radius whose center is offset from the vertical axis of symmetry of the branches of the stepladder to a side farther from the vertical axis of symmetry of the recess of the lining so that the line of contact between the surface of the lining and the surface of the upper leaf of the spring coincides with the plane passing through the vertical axis of symmetry of the branches of a stepladder.

A feature of the invention is illustrated in the accompanying drawing of a device for attaching a leaf spring to the axis of the car.

The device consists of two ladders 1, which press the spring 2 with tabs 6 to the support 3 with nuts 4. The ladders are mounted on plates 5 having recesses and a radius surface with a radius R, the center of which is offset by a distance L from the vertical axis of symmetry of the branches of the stepladder to the side, more distant from the central vertical axis of symmetry of the recess.

The device operates as follows. When loading, the spring bends, the step-ladders prevent the spring from bending in the middle part, press the spring to the support through the lining. The pads are installed on the locking tabs of the last leaf of the spring 6, keep the stepladder from diverging.

This device for fastening a leaf spring of a car is less laborious in manufacturing, increases the service life of a leaf spring when it is loaded by eliminating stress concentrators under the action of a load on the leaf spring, which, in turn, is the result of the protrusions of the leaf spring in the middle part of the spring between the vertical axis of symmetry of the branches of the stepladders, and the pad rests on the top leaf of the spring along a line coinciding with the surface passing through the vertical axis of symmetry of the branches of myanki.

The implementation of the present invention, illustrated and described above, should be considered as a preferred embodiment, and that various changes and additions may be made that are obvious to those skilled in the art. Therefore, changes and additions may be made to the invention that do not go beyond the essence and scope of the invention.

Information sources

1. URAL 532301 car and its modifications. User Guide, ed. 2002 year

2. Auth. St. USSR 998782, B60G 11/10, BI 7 from 02.23.1983.

Claims (1)

A device for attaching a leaf spring containing step-ladders covering the spring and overlays installed between the spring and step-ladders which are fixed by recesses of the overlay covering the protrusions of the upper leaf of the spring to prevent discrepancy, characterized in that said protrusions of the upper leaf of the spring are from the side of the overlay and its recess located opposite the protrusions are offset from the vertical axis of symmetry of the branches of the ladders in the direction of the middle part of the spring between the vertical axes of symmetry of the branches of the ladders, while the surface of the lining facing the surface of the upper leaf of the spring is made along a radius whose center is offset from the vertical axis of symmetry of the branches of the stepladder to a side farther from the vertical axis of symmetry of the recess of the lining, so that the line of contact of the surface of the lining with the surface of the upper leaf of the spring coincides with the plane passing through the vertical axis of symmetry of the branches of a stepladder.