FR2529980A1 - PNEUMATIC SPRING - Google Patents

Abstract

THE INVENTION RELATES TO A PNEUMATIC SPRING, IN PARTICULAR FOR MOTOR COVERS AND / OR LUGGAGE BOX COVERS OF MOTOR VEHICLES, WHICH CONSISTS OF A CYLINDER FILLED WITH GAS UNDER PRESSURE AND A PISTON THAT CAN SLIDE IN IT. AND CONNECTED TO A ROD. TO OBTAIN A LENGTH OF DEPLOYMENT OF THE PNEUMATIC SPRING WHICH EXCEEDS THE NORMAL WORKING STROKE, CYLINDER 2 IS PROVIDED FOR A TUBE OF ENCLOSURE 5 OPENED AT A TIP, WHICH CAN SLIDE TELESCOPICALLY WITH RESPECT TO THE CYLINDER INTERPHISURE AND SUBMISSIOUSLY.

Description

_-1 _

  The present invention relates to a pneumatic spring

  especially for engine hoods and / or

  lids of luggage compartments of motor vehicles

  the, which consists of a cylinder filled with a gas under pressure and a piston slidable therein

and connected to a rod.

  Such pneumatic springs are frequently used to assist the opening movement by

  example of an engine hood of a motor vehicle.

  Their length in deployment condition is

  in such a way as to obtain an opening angle of the hood which makes it possible to carry out normal maintenance work in the engine compartment, for example

  An angle of about 450 In different types of vehicle

  However, there is also the imperative of obtaining

  approximately at the end of the vehicle assembly or more

  late, when replacing the engine, an angle of

  In this respect, it was necessary in the past to dismantle at least one of the

pneumatic spring.

  The object of the invention is to improve a pneumatic spring of the type defined above so that it

  It is also possible to obtain such an angle of openness

  without disassembly of the air spring joint.

tick.

  This problem is solved according to the invention in that there is provided on the cylinder a casing tube open at one end, being able to slide telescopically with respect to the cylinder and subjected internally to the

atmospheric pressure.

  According to other features of the invention a) the cylinder and the casing tube are approximately the same length and the casing tube is guided on the outer wall of the cylinder 252. envelope tube has an end

  mounting eyelet or a similar part.

  Other advantages and characteristics of the

  will be highlighted later in the

  description, given by way of non-limiting example,

  with reference to the accompanying drawings in which Figure 1 is a longitudinal section of a

  pneumatic spring according to the invention in the posi-

  contraction; Figure 2 is a section corresponding to Figure 1 in the case where the air spring is fully deployed; Figure 3 shows the layout of such

  air spring on the engine hood of a vehicle

  automobile fuel for an aperture angle of about; and Figure 4 shows the arrangement of the Figure

  3 for an opening angle of 90.

  The air spring 1 shown in the drawings

  sins comprises a cylinder 2 in which is slidably mounted a piston 4 connected to a rod 3 On the cylinder 2 is engaged in sliding, opposite the rod 3, a casing tube 5 which carries end, to

  the opposite of its open end of engagement-on the cy-

  2, a mounting eyelet 6 Between the cylinder 2 and the casing tube 5, there is provided in the end a

elastic buffer 7.

  The casing tube can be secured to the

  be of a total clearance with respect to the cylinder of a

not shown.

  Figures 3 and 4 show schematically

  just a hood 8 of the engine compartment of a vehicle

  automobile, not shown in detail, which cover is hinged on a fixed portion 11 relative to this vehicle by means of levers 9,10 The 3-pneumatic spring 1, which allows opening of the engine cover 8 into the position 90 shown in Figure 4, is also articulated on the hood of

  8 and on the fixed part 11 of the vehicle, respec-

  by the ear 6 of the tube 5 and by means

  analogues carried by the free end of the rod 3.

-4-

Claims (3)

  1. A pneumatic spring, in particular for engine cowls and / or luggage compartment lids of motor vehicles, which consists of a cylinder filled with a gas under pressure and a piston slidable therein and connected to a rod, characterized in that it is provided on the cylinder (2)   an envelope tube (5) open at one end, capable of   smooth telescopically with respect to this cylinder and   internally submitted to atmospheric pressure.   2 air spring according to claim 1, characterized in that the cylinder (2) and the casing tube (5) have approximately the same length and the casing tube (5) is guided on the outer wall of the cylinder (2).   Pneumatic spring according to one of the   1 or 2, characterized in that the tube of   loppe (5) has at the end a mounting eyelet (6) or a similar part. E.