DE202005005477U1 - Hydraulic cylinder has support disc fitted in end of piston rod and piston rod eye has baseplate, whereby piston rod eye is fixed on support disc via fastening screws which passes through baseplate - Google Patents

Abstract

The hydraulic cylinder has a piston rod (3) longitudinally movable in a cylinder tube (2), with an eye (7) fitted on the free end (6) of the piston rod. A support disc is fitted in the end of the piston rod and the piston rod eye has a baseplate (8), whereby the piston rod eye is fixed on the support disc via fastening screws which pass through the baseplate. A threaded section with a female thread is provided in the end of the piston rod, and the support disc is fitted in the threaded section via a male thread provided on its outer circumference.

Description

The The invention relates to a hydraulic cylinder according to the features in the preamble of claim 1.

at Hydraulic cylinders are made up of cylinder, piston and piston rod existing components of a hydraulic system. You have the Task to execute translational (straight-line) movements and while forces transferred to and are therefore also referred to as a hydraulic linear motor.

hydraulic cylinders are available in a wide variety of designs and for the most diverse applications, For example, in industrial hydraulics or mobile hydraulics on excavators and crane systems. Cranes are equipped with hydraulic cylinders et al as a so-called luffing cylinder for actuating the articulated Booms used. To move the hydraulic cylinder with the To connect system components, have these fasteners in the form of a pivot bearing on the cylinder bottom and a rod eye at the free end of the piston rod.

at a known design of a hydraulic cylinder has the piston rod eye at its piston rod side end a threaded portion and is screwed with this in an internal thread of the piston rod. Execution the piston rod eye is in one piece. An assembly or disassembly of the piston rod eye on site is due the high weight, but also because of the required release and tightening forces and the necessary tools, especially in confined spaces conditions only possible with difficulty.

Of the Invention is therefore based on the prior art, the task based to show a hydraulic cylinder whose piston rod eye easier to assemble or disassemble.

The solution This object is according to the invention in a hydraulic cylinder with the features of protection claim 1.

crux invention forms the measure, that in the end of the piston rod, a support disc is mounted and the piston rod eye with its base plate via mounting screws the support plate is fixed.

By the embodiment of the invention is a much improved and easier assembly and disassembly the piston rod eye of a hydraulic cylinder possible. This is especially on site, so at the site of the hydraulic cylinder under there often spatially difficult conditions, for example, during repair or maintenance work, advantageous.

advantageous Embodiments of the fundamental The idea of the invention is the subject matter of the dependent claims 2 to 6th

Preferably the support plate is screwed into the end of the piston rod. For this purpose, provided in the end of the piston rod internal thread used. The support plate has a corresponding at its outer periphery external thread on and so can in the threaded portion in the end of the piston rod be screwed. There, the support disc forms a stable abutment for fixing or mounting the piston rod eye.

to Attachment of the piston rod eye to the support plate are in the Base plate of the piston rod eye Through holes for the fixing screws intended. The mounting screws pass through the through holes and are screwed into threaded holes of the support plate.

When for the Practice advantageous is considered when the piston rod eye is fork-shaped with two projecting from the base plate side cheeks, wherein the Fixing screws on a pitch circle of the base plate between the side cheeks are arranged.

The stable mounting of the piston rod eye on the piston rod is supported by that the base plate facing on its the free end of the piston rod Side has a nozzle extension, the form-fitting in engages the end of the piston rod. To prevent the ingress of foreign substances to prevent in the joint area is between spigot extension and the inside of the piston rod provided a seal. The Seal or the sealing material is expediently in an annular groove on the outer circumference positioned the neck extension.

Advantageous is also when the end of the piston rod from an outer rim the base plate is embraced.

The Invention is described below with reference to an embodiment. Show it:

1 in side view, partially in a sectional representation, a hydraulic cylinder;

2 in an enlarged representation, also in the side view, partly in vertical section, the end of the piston rod with fixed Piston rod eye;

3 the piston rod eye in plan view and

4 a view of the piston rod eye according to the arrow X in the 1 without the components of the hydraulic cylinder lying behind it.

In the 1 is a hydraulic cylinder 1 as used as a luffing cylinder for moving the boom on a mobile harbor crane used.

The hydraulic cylinder 1 essentially comprises a cylinder tube 2 with a longitudinally displaceable here not to be recognized piston and a piston rod 3 , For fixing the hydraulic cylinder 1 inside the crane system is at the cylinder bottom 4 a pivot bearing 5 and at the free end 6 the piston rod 3 a piston rod eye 7 intended. The piston rod eye 7 is fork-shaped and has a base plate 8th with two protruding side cheeks 9 , In each side cheek 9 is an eye 10 for receiving a pivot bearing 11 arranged (see also the 2 and 3 ).

The coupling of the piston rod eye 7 with the piston rod 3 via a carrier disc 12 , The support disk 12 owns on its outer circumference 13 an external thread 14 and is in one with an internal thread 15 provided threaded portion 16 in the end 6 the piston rod 3 screwed. On the support disc 12 is the piston rod eye 6 by fastening screws 17 established.

These are in the base plate 8th Through holes 18 provided by which the fastening screws 17 guided and in threaded holes 19 the support disc 12 are screwed in. Based on 4 one recognizes that in the illustrated embodiment for fixing the piston rod eye 7 on the support disc 12 a total of six mounting screws 17 on a pitch circle of the base plate 8th between the side walls 9 are arranged.

The determination of the piston rod eye 7 over the fixing screws 17 on the support disc 12 allows an advantageous assembly and disassembly of the piston rod eye 7 with the help of conventional screwing tools. This is particularly advantageous for assembly work on site in the operational use of the hydraulic cylinder 1 must be performed.

The base plate 8th points to its end 6 the piston rod 3 facing side 20 a spur process 21 on. This is under inclusion of a seal 22 in the end 6 the piston rod 3 used. As a seal 22 comes a silicone seal or an O-ring used, which in a groove 23 at the neck extension 21 is incorporated. Furthermore, this is the end 6 the piston rod 3 from an outer wreath 24 the base plate 8th encompassed. Between outer wreath 24 and neck extension 21 is such an annular groove 25 formed, in which the front end 26 the piston rod 3 comes to the plant.

1

hydraulic cylinders

2

cylinder tube

3

piston rod

4

cylinder base

5

pivot bearing

6

End of v. 3

7

Piston rod eye

8th

baseplate

9

side cheek

10

eye

11

pivot bearing

12

carrying disc

13

Outer circumference v. 12

14

external thread

15

Inside thread in 6

16

threaded portion

17

mounting screws

18

Through holes

19

Tapped holes in 12

20

Page v. 8th

21

Support extension

22

poetry

23

groove

24

outer rim

25

ring groove

26

Forehead v. 3

Claims (6)

Hydraulic cylinder, which one in a cylinder tube ( 2 ) longitudinally displaceably arranged piston rod ( 3 ), wherein at the free end ( 6 ) of the piston rod ( 3 ) a piston rod eye ( 7 ), characterized in that in the end ( 6 ) of the piston rod ( 3 ) a support disc ( 12 ) and the piston rod eye ( 7 ) a base plate ( 8th ), wherein the piston rod eye ( 7 ) via fastening screws ( 17 ), which the base plate ( 8th ), on the carrier disc ( 12 ). Hydraulic cylinder according to protection claim 1, characterized in that in the end ( 6 ) of the piston rod ( 3 ) a threaded section ( 16 ) with an internal thread ( 15 ) is provided and the support disc ( 12 ) via a on its outer circumference ( 13 ) provided external thread ( 14 ) in the threaded section ( 16 ) is mounted. Hydraulic cylinder according to protection claim 1 or 2, characterized in that in the base plate ( 8th ) Through holes ( 18 ) for the fixing screws ( 17 ) are provided which in threaded holes ( 19 ) of the support disc ( 12 ) are braced. Hydraulic cylinder according to one of the claims 1 to 3, characterized in that the base plate ( 8th ) on its end ( 6 ) of the piston rod ( 3 ) facing side ( 20 ) a neck extension ( 21 ), which incorporates a seal ( 22 ) in the end ( 6 ) of the piston rod ( 3 ) intervenes. Hydraulic cylinder according to one of the claims 1 to 4, characterized in that the end ( 6 ) of the piston rod ( 3 ) from an outer rim ( 24 ) of the base plate ( 8th ) is encompassed. Hydraulic cylinder according to one of the claims 1 to 5, characterized in that the piston rod eye ( 7 ) is bifurcated with two of the base plate ( 8th ) projecting side cheeks ( 9 ), the fixing screws ( 17 ) on a pitch circle of the base plate ( 8th ) between the side cheeks ( 9 ) are arranged.