SU1717433A1 - Driver seat suspension - Google Patents

Abstract

The suspension of the driver's seat of a vehicle refers to the additional equipment of the vehicle. The purpose of the invention is to increase the effectiveness of vibration protection by preventing suspension breakdowns. In parallel with the main 5 and additional 9 elastic elements, a friction limiter is introduced, made in the form of elastic springs 1. installed on the base and fitted with sliders 12 of friction material in contact with concave profiled segments 13 fixed on the seat frame, 2 or more.

Description

This invention relates to vehicle supplements.

The known suspension is the driver's seat of the vehicle, which has, in addition to the main carrier elastic element, an additional one made on the basis of mechanical systems with a jump. The power characteristics implemented by the two elastic systems contain a section of low rigidity and provide high vibration protection in the range of deflections that do not interrupt the calculated values commensurate with the angle of reduced rigidity.

However, when a vehicle is hit by single irregularities of considerable amplitude, suspension breakdowns occur and, therefore, significant dynamic reactions that adversely affect the driver’s working conditions.

The purpose of the invention is to increase the effectiveness of vibration protection by preventing suspension breakdowns.

Fig, 1 shows the suspension; figure 2 shows a section along the section aa.

 Between the base 1 and the seat 2 of the seat, guides 3 and 4 are fixed by means of hinges. The main elastic element 5, together with the adjusting device 6, is hinged at its ends with the base and the back of the seat. The additional elastic element consists of two torsion springs 7 mounted on the base and in contact with the ends of their levers 8, equipped with rollers 9, with convex profiled segments 10 fixed on the seat frame. Friction stops 11 of the stroke are made in the form of two flat springs, with one end fixed on the base.

The other ends of these springs are provided with sliders 12 made of friction material that come into contact with concave profiled elements 13 mounted on the seat frame.

Suspension seat works as follows. In the position of static equilibrium, the force of the driver’s gravity and elasticity of the main elastic element 5, the additional elastic elements 7 form the maximum horizontal forces forced towards each other without disturbing the equilibrium of the vertical suspension forces. Friction stops 11 stroke and concave profiled segments installed with a gap, do not contact with each other,

When the base 1 is moved relative to the seat body 2, a dynamic response occurs in the main elastic element. At the same time, the rollers 9 of the additional elastic elements emerge from the middle position relative to the convex shaped support 10, and a vertical component of the force arises in the suspension, which is opposite to the reaction of the main elastic element. With small movements of the base and the seat body relative to each other, corresponding to the calculated ones, the friction sliders practically do not have a force effect on the dynamic process in the suspension. As the magnitude of the displacements increases, the slides 12 come into contact with the concave segments 13. At the point of contact

a slider with a segment significantly increases the strength of dry friction, preventing the movement of the seat body relative to the base. The magnitude of this force depends on the profile of the concave segments, the stiffness of the springs, the magnitude of the displacement of the friction pairs relative to each other, and the coefficient of friction. Formed by the frictional limiter, the force of inelastic resistance smoothly increases with increasing

displacement amplitudes of the seat base.

The quality of vibration protection depends on the optimum ratio of stiffness and additional system parameters,

formed by structural elements according to:

R2 -x2

 Zh1 - 2 Zh2 X- (I / R2 - x2 R

Zh r

where W1 is the rigidity of the main elastic. an item;

G. - the rigidity of an additional element;

Zhz stiffness of the elastic element of the friction limiter;

. R is the radius of the surface of the convex segment of the additional element;

2b is the length of the concave segment;

p is the coefficient of dry friction between the slider and the concave surface of the segment of the friction limit stop; x is the coordinate along the segment, i.e. a b x 0

The proposed seat suspension design provides effective protection against vibration in the range of working deflections (its own frequency varies from 0.1 to 0.5 Hz) and prevents breakdown and buildup of the seat frame when a vehicle hits significant irregularities in amplitude.

 G1 - 2 G2

Have

§Lzi

R2

W p

Claims (1)

Claims of the invention Suspension of the driver's seat of a vehicle, comprising a base, a seat frame fixed on it, parallel guide links, hingedly mounted on the seat and base frame, the main elastic element and additional elastic elements mounted together with it, profiled segments mounted the seats are made one - convex, the others are concave, two pairs of contact links attached to the seat frame, one of which with rollers interacting with convex overhnost E segments, characterized in that, in order to increase the efficiency of vibration protection by preventing breakdowns, it snab-. the wife of friction sliders mounted on the second pair of contact links with a gap to the middle part of the concave segments, while the concave surface of the segment is formed from the condition: ( --JTт7i - 75 K  - fR2 -b2) -x ZhZ where G1 - the rigidity of the main elastic element; G2 - the rigidity of the additional element; Zhz - stiffness of the elastic element of the friction limiter; R is the radius of the surface of the convex segment of the additional elastic element; 2b is the length of the concave segment; f is the coefficient of dry friction between the ram and the concave surface of the segment of the friction limiter; x is the coordinate along the segment, i.e. b. 1