DE8003846U1 - Hydraulically or pneumatically operated single-acting piston-cylinder arrangement - Google Patents

Description

Hydraulically or pneumatically operated single-acting piston-cylinders -Arrangement

The innovation relates to a hydraulically or pneumatically operated single-acting piston-cylinder arrangement such as. e.g. a Hydraulic or pneumatic cylinders.

In arrangements of this type, a single-acting hydraulic or Pneumatic cylinder, i.e. a piston that can be extended out of a cylinder in one direction with pressure medium such as oil, air or the like. acted upon with the help of a feed pump. As long as pressure is applied to the piston surface, the piston moves up to a stop the end. If the supply of pressure medium is stopped, the piston stops. If you want the piston back in its starting position have back, he must by external force such as e.g. from Handj via a tension or compression spring or the like that is tensioned when the piston is extended. This must have a corresponding valve, the pressure medium can escape freely from the piston chamber of the cylinder. That kind of piston-cylinder arrangement is often used in practice for remote actuation of mechanical unlocking of locks, adjustment of drives, Switching on and off clutches or gears is used. Double-acting piston-cylinder arrangements are also used to solve this problem built-in. However, the latter arrangement is very expensive in terms of manufacturing costs and material expenditure agile and expensive.

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The task of the innovation is to provide a single-acting hydraulic i

or pneumatic cylinder of the type described above structurally g

to train small and compact, so that it has the function for remote i

operational purposes of a double-acting cylinder takes over, from t However, it is cheaper to manufacture in terms of price.

This problem is solved in that a part, '}.

preferably the greater part of the piston-cylinder arrangement |

located inside a cylindrical tension spring. This becomes <i ' an optimal utilization of space is achieved. As a cylindrical tension spring has a continuous cavity inside, it offers enough space for a hydraulic or pneumatic cylinder.

By nesting the two parts, the overall construction; size by only a small part of a conventional hydraulic or pneumatic cylinder. The cylindrical tension spring

is connected to the piston rod at one end and to ',

attached to the cylinder. It is advantageous here that both I ₁

Threaded grooves are provided on the piston as well as on the cylinder, ';

in which the ends of the cylindrical ό

Tension spring to be attached. The thread grooves can be used in:,

Manufacture of pistons and cylinders directly by casting, forging}

which or are shaped by chip-removing shaping. Here-?: ■ this reduces the processing costs. It is conceivable ί but also, the thread grooves after the production of the piston and cylinder as a molded part made of cast iron, as a forging or the like. On the ■■ To attach pistons and cylinders.

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The arrangement of the spring is in each case such that the direction of force the spring force is opposite to the direction of force of the hydraulically or pneumatically actuated piston. A provision of the piston in its starting position is therefore always given.

The drawing shows an embodiment of a hydraulically or pneumatically operated single-acting piston-cylinder arrangement shown schematically, omitting the hose connection and the valve and pump part.

f It show:

Fig. 1 The piston-cylinder arrangement with tension spring in the starting position. The mainspring is shown in the de-energized state and in section.

FIG. 2 shows the object of FIG. 1 in the extended position. The mainspring is also in Section shown.

The illustrated piston-cylinder arrangement 1 consists essentially from the cylinder 2, which is designed as a single-acting cylinder, and the piston with the piston rod 3. On the outer circumference of the cylinder 2, some thread grooves 5 are provided directly on the hose connector 4.

The thread grooves 5 wind helically un the cylinder Their pitch and radius 6 are adapted to the dimensions of the cylindrical tension spring 7. The tension spring 7 is in both Figures shown in section. There are also thread grooves on the circumference of the fork 8, which is screwed onto the piston rod 5 with the radius 6. The assembly of the entire piston-cylinder arrangement is carried out in such a way that initially the piston with the piston rod 2 is inserted into the cylinder 2 without a fork 8.

The piston rod 2 is sealed in the cylinder 2 by means of a sealing and locking ring (not shown). After that, the The tension spring 7 is pushed over the cylinder 2 without tension and fastened in the thread grooves 5 by screwing movements. On the piston rod 3, which is formed with a thread at the end protruding from the cylinder 2, becomes the one with an internal thread equipped fork 8 firmly screwed on. By further turning movements and light pressure on the piston rod 3, the The fork 8 is screwed into the tension spring 7 by means of the thread grooves 5. On the cylinder 2 there is another fork 9. With the forks 8, 9 is the entire unit, e.g. for switching a dog clutch (not shown) in an agricultural vehicle built-in.

The actuation takes place in such a way that hydraulic pumps (not shown) (Hand ¹ or Motorpurapen), via a valve and a connecting hose, press pressure medium through the hose connector 4 in the direction of arrow a into the piston chamber of the cylinder 2 in FIG.

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The piston rod 3 moves in the direction of arrow b, e.g. now switched on a clutch. At the same time the tension spring 7 should now be switched off again, for example a valve is opened on the tank of the pump so that Hydraulic fluid can evade in the direction of arrow c. The tension spring 7 moves while the hydraulic fluid is transported back at the same time into the tank of the pump the piston with the piston rod 3 in the direction of arrow d as far as it will go. I.

The / advantages of this arrangement of the tension spring consists in the compact Construction of cylinder, piston and spring. Additional fastening elements for the tension spring 7 and the spring hooks themselves omitted. The production costs of the spring are also reduced as a result.

Claims (1)

Claims ι 1. Hydraulically or pneumatically operated, single-acting piston-cylinder arrangement, characterized in that a part, preferably the larger part of the piston-cylinder arrangement (1) located inside a cylindrical tension spring (7). 2. piston-cylinder arrangement 'according to claim 1, characterized in that that the cylindrical tension spring (7) at one end on the piston rod or the like (3) and at the other end on the cylinder (2) is attached. 3. Piston-cylinder arrangement according to claim 1 and 2, characterized in that that both the piston rod (3) and the cylinder (2) threaded grooves (5) are provided in which by screwing movements the ends of the cylindrical tension spring (7) are attached. Bank accounts:%>, * {YY Y, '* ,. ";, J .. Oldbg. Londeabank AQ, Llngan (BLZ 24β2Ρβ10 (rftoJMr. ΦίΟΟΙ i "pr ({BdrJer Bank Aa ₁ Llngen (BLZ 268800TO) KtO ₁ -Nr. 8440804 Kretaaparkaaa · βρβΙΙβ (BLZ 28000001 20000404) KtC-Nr. ₁ IOOOOIIO Commarzbank Llngen (BLZ 28840049) Account-Nr. 4708124 ■ Poeteoheckkto. Hannover Nr. 030 20-300 • t
'ff ff ff ·· · r \ 1 * rrr · «ft · ¹ I. Piston-cylinder arrangement according to claims 1 to 3, characterized in that the direction of force of the cylindrical tension spring (7) is always opposite to the direction of force of the hydraulically or pneumatically operated piston with piston rod (3). 5. Piston-cylinder arrangement according to claim 1 to 3, characterized in that that the overall size of the piston-cylinder arrangement with the cylindrical tension spring (7) by a small portion a conventional piston-cylinder arrangement, such as a hydraulic cylinder, is larger.