EP2466157B1 - Telescopic hydraulic cylinder - Google Patents
Telescopic hydraulic cylinder Download PDFInfo
- Publication number
- EP2466157B1 EP2466157B1 EP11193278.6A EP11193278A EP2466157B1 EP 2466157 B1 EP2466157 B1 EP 2466157B1 EP 11193278 A EP11193278 A EP 11193278A EP 2466157 B1 EP2466157 B1 EP 2466157B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- groove
- tube
- hydraulic cylinder
- telescopic hydraulic
- stop ring
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 230000003467 diminishing effect Effects 0.000 claims 1
- 238000005452 bending Methods 0.000 description 19
- 239000012530 fluid Substances 0.000 description 8
- 230000007704 transition Effects 0.000 description 6
- 238000010276 construction Methods 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/16—Characterised by the construction of the motor unit of the straight-cylinder type of the telescopic type
Definitions
- the invention concerns a telescopic hydraulic cylinder in accordance with the preamble of claim 1.
- a sideways force on an extended piston or tube that results in a bending moment in the lower end of an inner tube and a similar bending moment in the adjacent top end of a concentric outer tube.
- This bending moment leads to bending stress in the tube and stress concentration due to abrupt changes in the cross section of the tube near the inner groove might lead to rupture of the tube.
- High fluid pressure in the telescopic hydraulic cylinders increases the risk of rupture as the high fluid pressure also leads to stress in the tubes and this adds to the bending stress.
- the telescopic hydraulic cylinder In order to increase the resistance of the telescopic hydraulic cylinder against bending and axial forces the telescopic hydraulic cylinder is according to claim 1. In this way, by reducing the cross section in the high loaded part of the tube over a longer length than the width of the outer groove, the tube remains over a longer stretch of the tube under high tension but the stress concentration is reduced and the resistance against bending increases.
- Document EP 0450501 discloses a telescopic hydraulic cylinder with inner stop rings and outer stop rings.
- Figures 5-6 disclose an inner stop ring 45.1 and an outer stop ring 45.2 and between these two rings there is an intermediate ring 35H or are intermediate rings 35H and 35H2.
- the function of the intermediate rings is to improve the direction under which the load is affected on the stop rings.
- a groove for the intermediate ring(s) In order to accommodate an intermediate ring of sufficient dimension there is adjacent to the inner grooves and outer groove a groove for the intermediate ring(s). This groove has a shallow depth and its depth does not extend to a depth of more than 50% of the depth of the inner groove or the outer groove.
- Figure 7 show a similar construction wherein the depth of the groove is also significantly less than 50% of the depth of the inner groove or the outer groove.
- a telescopic hydraulic cylinder according to the preamble of claim 1 is known from DE 20 04 117 A1 .
- the resistance against bending at the other end of the tube is increased.
- the telescopic hydraulic cylinder is according to claim 2.
- the minimum section surface of the tubes increases over a considerable length thereby avoiding sudden increases that might lead to stress concentrations.
- the telescopic hydraulic cylinder is according to claim 3.
- the ridge can maintain the stop ring in its position on the tube and/or the relief groove can be machined as several narrow grooves that have the same effect as a groove of larger width.
- the telescopic hydraulic cylinder is according to claim 4. In this way, the contact area between the stop rings in extended position is large so that surface stress between the stop rings is reduced.
- the telescopic hydraulic cylinder is according to claim 5.
- the inner stop ring groove and/or the outer stop ring groove are smaller, less deep and give less stress concentration.
- the tube has a small wall thickness so that the weight of the telescopic hydraulic cylinder is reduced.
- FIG. 1 shows a tipper 1 comprising a tractor 4 and a trailer 5.
- a hinge 8 connects a frame of the trailer 5 and a tipping body 2 and a telescopic hydraulic cylinder 3 can lift the tipping body 2 to a tilted position for unloading the tipping body 2.
- the trailer 5 has axles with wheels to support the frame of the trailer 5 on the terrain.
- the terrain might have mounds 6, so that a rear axle 7 and with that the hinge 8 can be slightly inclined whereby the trailer 5 has a slight twist.
- the inclination of the hinge 8 can cause sideways movement of the tipping body 2 relative to the trailer 5 and in extreme situations this might lead to rolling over of the tipper 1 during lifting of the tipping body 2.
- the telescopic hydraulic cylinder 3 can reduce the sideways movement of the tipping body 2 relative to the trailer 5 during tipping.
- FIG. 2 and figure 3 show the telescopic hydraulic cylinder 3.
- Two chassis brackets 13 are mounted on the trailer 5 and support two chassis trunnions 12 that support a base tube 14.
- the base tube 14 can swivel around a base tube swivel axis 28 in the chassis brackets 13; the base tube swivel axis 28 is mounted parallel to the axis of hinge 8.
- the base tube 14 has a centreline 24, a bottom plate 29, and a high-pressure connection 15.
- a tube 23 can slide in the direction of the centreline 24 in the base tube 14.
- a tube 22 can slide in the direction of the centreline 24 in the tube 23.
- a tube 21 can slide in the direction of the centreline 24 in the tube 22.
- a tube 20 can slide in the direction of the centreline 24 in the tube 21.
- the bottom plate 29 can support the tubes 20, 21, 22, and 23.
- a piston 19 can slide in the tube 20 in the direction of the centreline 24.
- the shown embodiment has four tubes that can slide relative to the piston 19 and the base tube 14, in other embodiments, this number of tubes can have any value above zero.
- the piston 19 is made from a tube and is closed at the underside by a plate 30 and at the top by a plug 17.
- the plug 17 and a top plate 18 are connected and the top plate 18 is connected to a cover tube 9.
- a spherical ring 27 that is coupled to the cover tube 9 supports a lifting ring 16 with lifting trunnions 11 that swivably connect the lifting ring 16 to lifting brackets 10.
- the lifting ring 16 can rotate around a top swivel axis 25.
- the lifting brackets 10 couple the telescopic hydraulic cylinder 3 to the tipping body 2, whereby the top swivel axis 25 and the base tube swivel axis 28 are parallel to the axis of the hinge 8.
- a spherical bearing 27 between the lifting ring 16 and the spherical ring 27 compensates for alignment errors between the top swivel axis 25, the base tube swivel axis 28 and the axis of the hinge 8.
- the tipping body 2 and the piston 19 are coupled and the position of the tipping body 2 determines the position of the piston 19 in the telescopic hydraulic cylinder 3.
- the base tube 14 and the tubes 20, 21, 22, and 23 have near the top end of their inside surface a groove into which a seal 37 is mounted to seal a gap between the base tube 14, the tubes 20, 21, 22, or 23 or the piston 19.
- Each seal 37 can slide over an outside surface of an adjacent tube 20, 21, 22, or 23 or the outside surface of the piston 19 and the seals 37 are suitable for the high pressure in the telescopic hydraulic cylinder 3 and seal the area inside the telescopic hydraulic cylinder 3 from the surroundings.
- the wipers 40 mounted in a groove at the top end of the inside surfaces of the base tube 14 and the tubes 20, 21, 21, 22, and 23, remove contaminations from the outside surfaces of the tubes 20, 21, 22, and 23 and the piston 19 and prevent dirt entering the gaps.
- the inside surfaces have an upper wear ring 39 mounted at the top in grooves, under the upper wear ring 39 a lower wear ring 38, and at the bottom mounted in grooves in the outside surfaces a slider 33.
- the upper wear rings 39 and the lower wear rings 38 are mounted between the seal 37 and the wiper 40.
- Inner lift rings 31 that interact with outer lift rings 32 or with a slider 33 ensure that the tubes 20, 21, 22 and 23 move together with the piston 19 in upward direction.
- the inner lift rings 31 are mounted in grooves in the inside surface of the tubes 20, 21, 22, and 23.
- the outer lift rings 32 are mounted in grooves in the outside surfaces of the piston 19 and the tubes 20 and 21.
- the slider 33 in tube 22 acts in a similar manner as an outer lift ring 31.
- the upward movement of the tube 23 stops when an outer stop ring 35 of the tube 23 interacts with an inner stop ring 36 of the base tube 14 and the tube 23 has reached its maximum extension.
- the outer stop rings 35 are mounted in grooves in the outer surfaces of the piston 19 and the tubes 20, 21, 22, and 23.
- the inner stop rings 36 are mounted in grooves in the inner surface of the base tube 14 and the tubes 20, 21, 22, and 23.
- Figure 4 shows the transition between tube 22 and tube 23 when they are in extended position and the inner stop ring 36 and the outer stop ring 35 interact.
- the shown transition is exemplary for the other transitions between the base tube 14, the tubes 20, 21, 22 and 23, and the piston 19 and the shown transition is similar between the other tubes 20, 21, the base tube 14, and the piston 19.
- the telescopic hydraulic cylinder 3 stabilises the transversal movement of a lifted tipping body 2 by exerting a transverse force F H on the tipping body 2.
- This transverse force F H causes a bending moment M in the extended telescopic hydraulic cylinder 3 and this bending moment M is highest near the trailer 5.
- This bending moment M causes bending of the tubes 14, 20, 21, 22 and 23 in the longitudinal direction and deformation of the circular section of the tubes 14, 20, 21, 22 and 23 to a slightly oval section. This means that the bending moment M causes bending stress in the base tube 14 and the tubes 20, 21, 22, and 23.
- the bending moment is indicated as bending moment M 22-23 .
- the bending moment M 22-23 causes a force P between the upper wear ring 39 and the outer surface of tube 22 and a force Q between the slider 33 and the inner surface of tube 23.
- the grooves of the outer stop ring 35 and the inner stop ring 36 reduce the strength of the tubes 22, 23 the grooves form the weakest part of the tubes, especially for the inside tube 22 that has the smallest diameter.
- the grooves have a depth of more than 20 % of the wall thickness of the tube 22,23 for the outer groove and more than 25% of the inner groove to make it possible that the stop rings 35,36 transmit the axial forces between the adjacent tubes 22,23.
- a relief groove 41 reduces the stress in the bottom of the groove of the outer stop ring 35 and so reduces the risk of damages.
- Figure 5 shows various embodiments of the relief groove 41 in an outer surface of a tube.
- Figure 5a shows an embodiment wherein a small ridge limits the axial movement of the outer stop ring 35 and wherein the groove has a depth that is approximately equal to the depth of the groove for the outer stop ring 35.
- the width of the ridge is smaller than the depth of the groove for the outer stop ring 35 and the ridge might have a fillet to the bottom of the relief groove 41.
- Figure 5b shows an embodiment with a relief groove 41 with a large radius from the bottom of the groove for the outer stop ring 35 to the outside diameter with a width of at least the twice the width of the groove for the outer stop ring 35.
- Figure 5c shows a similar embodiment with a relief groove 41 with a conical surface.
- the minimum diameter of the relief groove 41 is approximately equal to the diameter of the groove for the outer stop ring 35.
- the outer stop ring 35 clamps around the tube to prevent axial movement.
- Figure 5d shows as a further embodiment of the relief groove a first narrow relief groove 41 separated by a ridge from the groove for the outer stop ring 35, which first narrow relief groove 41 has a depth that is approximately equal to the depth of the groove for the outer stop ring 35.
- the first narrow relief groove 41 has a width that is smaller than its depth and the bottom has a fillet.
- a second and possibly a third narrow relief groove are adjacent to the first narrow relief groove 41 wherein the second groove and the third groove have a decreasing depth.
- the first, the second and/or the third relief groove are thin ridges that have a thickness that is smaller than the depth of the outer groove for the stop ring.
- the relief grooves 41 can have similar dimensions.
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Actuator (AREA)
- Forklifts And Lifting Vehicles (AREA)
Description
- The invention concerns a telescopic hydraulic cylinder in accordance with the preamble of
claim 1. In the known telescopic hydraulic cylinders a sideways force on an extended piston or tube that results in a bending moment in the lower end of an inner tube and a similar bending moment in the adjacent top end of a concentric outer tube. This bending moment leads to bending stress in the tube and stress concentration due to abrupt changes in the cross section of the tube near the inner groove might lead to rupture of the tube. High fluid pressure in the telescopic hydraulic cylinders increases the risk of rupture as the high fluid pressure also leads to stress in the tubes and this adds to the bending stress. - In order to increase the resistance of the telescopic hydraulic cylinder against bending and axial forces the telescopic hydraulic cylinder is according to
claim 1. In this way, by reducing the cross section in the high loaded part of the tube over a longer length than the width of the outer groove, the tube remains over a longer stretch of the tube under high tension but the stress concentration is reduced and the resistance against bending increases. - Document
EP 0450501 discloses a telescopic hydraulic cylinder with inner stop rings and outer stop rings.Figures 5-6 disclose an inner stop ring 45.1 and an outer stop ring 45.2 and between these two rings there is an intermediate ring 35H or are intermediate rings 35H and 35H2. The function of the intermediate rings is to improve the direction under which the load is affected on the stop rings. In order to accommodate an intermediate ring of sufficient dimension there is adjacent to the inner grooves and outer groove a groove for the intermediate ring(s). This groove has a shallow depth and its depth does not extend to a depth of more than 50% of the depth of the inner groove or the outer groove. Figure 7 show a similar construction wherein the depth of the groove is also significantly less than 50% of the depth of the inner groove or the outer groove. Due to their smaller depth these grooves do not reduce the cross section in the high loaded part of the tube over a longer length than the width of the outer groove and so do not remove the stress concentration in the outer groove. This means that the prior art document does not disclose the invention and the document does not give an indication that the grooves might contribute to reduce the stress in the tubes. - A telescopic hydraulic cylinder according to the preamble of
claim 1 is known fromDE 20 04 117 A1 - In accordance with an embodiment, the telescopic hydraulic cylinder is according to
claim 2. In this way, the minimum section surface of the tubes increases over a considerable length thereby avoiding sudden increases that might lead to stress concentrations. - In accordance with an embodiment the telescopic hydraulic cylinder is according to
claim 3. In this way, the ridge can maintain the stop ring in its position on the tube and/or the relief groove can be machined as several narrow grooves that have the same effect as a groove of larger width. - In accordance with an embodiment, the telescopic hydraulic cylinder is according to claim 4. In this way, the contact area between the stop rings in extended position is large so that surface stress between the stop rings is reduced.
- In accordance with an embodiment, the telescopic hydraulic cylinder is according to
claim 5. In this way, the inner stop ring groove and/or the outer stop ring groove are smaller, less deep and give less stress concentration. - In accordance with the invention, the tube has a small wall thickness so that the weight of the telescopic hydraulic cylinder is reduced.
- The invention is explained with the aid of one or more embodiments using a drawing. In the drawing
-
Figure 1 shows a perspective view of a tipper with a telescopic hydraulic cylinder lifting a tipping body, -
Figure 2 shows a perspective view of the telescopic hydraulic cylinder for lifting the tipping body, -
Figure 3 shows a section of the telescopic hydraulic cylinder offigure 2 in retracted position, -
Figure 4 shows a detail of the transition between two tubes of the telescopic hydraulic cylinder offigure 2 in extended position, and -
Figure 5 shows various embodiments of the relief groove of a tube of the telescopic hydraulic cylinder offigure 2 . -
Figure 1 shows atipper 1 comprising a tractor 4 and atrailer 5. Ahinge 8 connects a frame of thetrailer 5 and a tippingbody 2 and a telescopichydraulic cylinder 3 can lift the tippingbody 2 to a tilted position for unloading the tippingbody 2. Thetrailer 5 has axles with wheels to support the frame of thetrailer 5 on the terrain. The terrain might havemounds 6, so that arear axle 7 and with that thehinge 8 can be slightly inclined whereby thetrailer 5 has a slight twist. The inclination of thehinge 8 can cause sideways movement of the tippingbody 2 relative to thetrailer 5 and in extreme situations this might lead to rolling over of thetipper 1 during lifting of the tippingbody 2. By giving support to the tippingbody 2 in a direction transverse to thetrailer 5 the telescopichydraulic cylinder 3 can reduce the sideways movement of the tippingbody 2 relative to thetrailer 5 during tipping. -
Figure 2 andfigure 3 show the telescopichydraulic cylinder 3. Twochassis brackets 13 are mounted on thetrailer 5 and support twochassis trunnions 12 that support abase tube 14. Thebase tube 14 can swivel around a base tubeswivel axis 28 in thechassis brackets 13; the base tubeswivel axis 28 is mounted parallel to the axis ofhinge 8. Thebase tube 14 has acentreline 24, abottom plate 29, and a high-pressure connection 15. Atube 23 can slide in the direction of thecentreline 24 in thebase tube 14. Atube 22 can slide in the direction of thecentreline 24 in thetube 23. Atube 21 can slide in the direction of thecentreline 24 in thetube 22. Atube 20 can slide in the direction of thecentreline 24 in thetube 21. In retracted position of the telescopichydraulic cylinder 3, thebottom plate 29 can support thetubes piston 19 can slide in thetube 20 in the direction of thecentreline 24. The shown embodiment has four tubes that can slide relative to thepiston 19 and thebase tube 14, in other embodiments, this number of tubes can have any value above zero. - The
piston 19 is made from a tube and is closed at the underside by aplate 30 and at the top by aplug 17. Theplug 17 and atop plate 18 are connected and thetop plate 18 is connected to acover tube 9. Aspherical ring 27 that is coupled to thecover tube 9 supports alifting ring 16 with liftingtrunnions 11 that swivably connect thelifting ring 16 to liftingbrackets 10. Thelifting ring 16 can rotate around a topswivel axis 25. Thelifting brackets 10 couple the telescopichydraulic cylinder 3 to the tippingbody 2, whereby the topswivel axis 25 and the base tubeswivel axis 28 are parallel to the axis of thehinge 8. A spherical bearing 27 between thelifting ring 16 and thespherical ring 27 compensates for alignment errors between the topswivel axis 25, the base tubeswivel axis 28 and the axis of thehinge 8. As described the tippingbody 2 and thepiston 19 are coupled and the position of the tippingbody 2 determines the position of thepiston 19 in the telescopichydraulic cylinder 3. - The
base tube 14 and thetubes seal 37 is mounted to seal a gap between thebase tube 14, thetubes piston 19. Eachseal 37 can slide over an outside surface of anadjacent tube piston 19 and theseals 37 are suitable for the high pressure in the telescopichydraulic cylinder 3 and seal the area inside the telescopichydraulic cylinder 3 from the surroundings. Thewipers 40, mounted in a groove at the top end of the inside surfaces of thebase tube 14 and thetubes tubes piston 19 and prevent dirt entering the gaps. For guiding thepiston 19, thetubes base tube 14 relative one another the inside surfaces have anupper wear ring 39 mounted at the top in grooves, under the upper wear ring 39 alower wear ring 38, and at the bottom mounted in grooves in the outside surfaces aslider 33. Theupper wear rings 39 and thelower wear rings 38 are mounted between theseal 37 and thewiper 40. - Filling the telescopic
hydraulic cylinder 3 with pressurised fluid through thehigh pressure connection 15 causes the pressurized fluid to enter in the gaps between thebase tube 14, thetubes piston 19 throughholes 34 to the room between thepiston 19 and thebottom plate 29. The pressurized fluid pushes thepiston 19 andtubes piston 19 upwards.Inner lift rings 31 that interact withouter lift rings 32 or with aslider 33 ensure that thetubes piston 19 in upward direction. Theinner lift rings 31 are mounted in grooves in the inside surface of thetubes piston 19 and thetubes slider 33 intube 22 acts in a similar manner as anouter lift ring 31. - The upward movement of the
tube 23 stops when anouter stop ring 35 of thetube 23 interacts with aninner stop ring 36 of thebase tube 14 and thetube 23 has reached its maximum extension. The outer stop rings 35 are mounted in grooves in the outer surfaces of thepiston 19 and thetubes base tube 14 and thetubes - Further filling of the telescopic
hydraulic cylinder 3 with pressurized fluid pushes thepiston 19 andtubes outer stop ring 35 of thetube 22 interacts with aninner stop ring 36 oftube 23 andtube 22 has its maximum extension. Further filling of the telescopichydraulic cylinder 3 brings one after theother tube 21,tube 20, and thepiston 19 to their maximum extension. The telescopichydraulic cylinder 3 then has its maximum extension and thetipping body 2 has its maximum tipping position. - Releasing pressurized fluid from the extended telescopic
hydraulic cylinder 3 causes thepiston 19 to move downwards in thetube 20 until the underside of thepiston 19 interacts with aninner lift ring 31 of thetube 20. Further releasing of pressurize fluid causes thepiston 19 andtube 20 to move downwards until anouter lift ring 32 oftube 20 interacts with aninner lift ring 31 oftube 21. In a similar way thetubes base tube 14 until the telescopichydraulic cylinder 3 is in its retracted position. -
Figure 4 shows the transition betweentube 22 andtube 23 when they are in extended position and theinner stop ring 36 and theouter stop ring 35 interact. The shown transition is exemplary for the other transitions between thebase tube 14, thetubes piston 19 and the shown transition is similar between theother tubes base tube 14, and thepiston 19. - As discussed earlier the telescopic
hydraulic cylinder 3 stabilises the transversal movement of a liftedtipping body 2 by exerting a transverse force FH on thetipping body 2. This transverse force FH causes a bending moment M in the extended telescopichydraulic cylinder 3 and this bending moment M is highest near thetrailer 5. This bending moment M causes bending of thetubes tubes base tube 14 and thetubes - At the location of the transition between
tube 22 andtube 23, the bending moment is indicated as bending moment M22-23. The bending moment M22-23 causes a force P between theupper wear ring 39 and the outer surface oftube 22 and a force Q between theslider 33 and the inner surface oftube 23. This means that between theupper wear ring 39 and theslider 33 bothtubes outer stop ring 35 and theinner stop ring 36 reduce the strength of thetubes inside tube 22 that has the smallest diameter. As the tubes in the telescopichydraulic cylinder 3 have relative thin walls in order to reduce its weight, the grooves have a depth of more than 20 % of the wall thickness of thetube adjacent tubes relief groove 41 reduces the stress in the bottom of the groove of theouter stop ring 35 and so reduces the risk of damages. In another embodiment, there is arelief groove 41 both adjacent to the groove of theouter stop ring 35 and adjacent to the groove of theinner stop ring 36. -
Figure 5 shows various embodiments of therelief groove 41 in an outer surface of a tube.Figure 5a shows an embodiment wherein a small ridge limits the axial movement of theouter stop ring 35 and wherein the groove has a depth that is approximately equal to the depth of the groove for theouter stop ring 35. The width of the ridge is smaller than the depth of the groove for theouter stop ring 35 and the ridge might have a fillet to the bottom of therelief groove 41.Figure 5b shows an embodiment with arelief groove 41 with a large radius from the bottom of the groove for theouter stop ring 35 to the outside diameter with a width of at least the twice the width of the groove for theouter stop ring 35.Figure 5c shows a similar embodiment with arelief groove 41 with a conical surface. The minimum diameter of therelief groove 41 is approximately equal to the diameter of the groove for theouter stop ring 35. In these latter embodiments, theouter stop ring 35 clamps around the tube to prevent axial movement.Figure 5d shows as a further embodiment of the relief groove a firstnarrow relief groove 41 separated by a ridge from the groove for theouter stop ring 35, which firstnarrow relief groove 41 has a depth that is approximately equal to the depth of the groove for theouter stop ring 35. The firstnarrow relief groove 41 has a width that is smaller than its depth and the bottom has a fillet. As indicated with interrupted lines infigure 5d , in another embodiment a second and possibly a third narrow relief groove are adjacent to the firstnarrow relief groove 41 wherein the second groove and the third groove have a decreasing depth. Between the groove for theouter stop ring 35, the first, the second and/or the third relief groove are thin ridges that have a thickness that is smaller than the depth of the outer groove for the stop ring. In the inner surface of a tube, therelief grooves 41 can have similar dimensions.
Claims (5)
- Telescopic hydraulic cylinder (3) comprising two or more concentric cylindrical tubes (14,20,21,22,23) and a piston (19), seals (37) between the cylindrical tubes and the piston whereby the cylindrical tubes and the piston can move in axial direction relative one another between a retracted position and an extended position, an inner tube (20,21,22,23) or piston has an outer stop ring (35) mounted in an outer groove with a depth of more than 20% of the wall thickness of the tube in its outer surface and an outer tube or base tube has an inner stop ring (36) mounted in an inner groove with a depth of more than 25% of the wall thickness of the tube in its inner surface, in the extended position the outer stop ring and the inner stop ring interact against each other for in the extended position limiting movement in axial direction wherein adjacent to the outer groove at the side of the outer groove away from the nearest end of the inner tube there is an outer relief groove (41) with a depth that is substantially equal to the depth of the outer groove and characterised in that adjacent to the inner groove at the side of the inner groove away from the nearest end of the outer tube there is an inner relief groove with a depth that is substantially equal to the depth of the inner groove.
- Telescopic hydraulic cylinder in accordance with claim 1 wherein the outer relief groove (41) has a width of at least twice the width of the outer groove and/or the inner relief groove has a width of at least twice the width of the inner groove and wherein the relief grooves can have in the direction away from the outer groove or inner groove a diminishing depth over the width.
- Telescopic hydraulic cylinder in accordance with one of the previous claims wherein the outer relief groove and/or the inner relief groove has a ridge with a width that is smaller than the depth of the outer groove or the inner groove.
- Telescopic hydraulic cylinder in accordance with one of the previous claims wherein the inner stop ring (36) and/or the outer stop ring (35) have a rectangular section.
- Telescopic hydraulic cylinder in accordance with one of the previous claims wherein the inner stop ring and/or the outer stop ring have a hexagonal section.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP11193278.6A EP2466157B1 (en) | 2010-12-16 | 2011-12-13 | Telescopic hydraulic cylinder |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP10195427A EP2466156A1 (en) | 2010-12-16 | 2010-12-16 | Telescopic hydraulic cylinder |
EP11193278.6A EP2466157B1 (en) | 2010-12-16 | 2011-12-13 | Telescopic hydraulic cylinder |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2466157A1 EP2466157A1 (en) | 2012-06-20 |
EP2466157B1 true EP2466157B1 (en) | 2017-11-29 |
Family
ID=43902643
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP10195427A Withdrawn EP2466156A1 (en) | 2010-12-16 | 2010-12-16 | Telescopic hydraulic cylinder |
EP11193278.6A Active EP2466157B1 (en) | 2010-12-16 | 2011-12-13 | Telescopic hydraulic cylinder |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP10195427A Withdrawn EP2466156A1 (en) | 2010-12-16 | 2010-12-16 | Telescopic hydraulic cylinder |
Country Status (4)
Country | Link |
---|---|
EP (2) | EP2466156A1 (en) |
CN (1) | CN102588381B (en) |
BR (1) | BRPI1106869B1 (en) |
TR (1) | TR201802819T4 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2584203A1 (en) | 2011-10-20 | 2013-04-24 | Hyva Holding BV | A telescopic hydraulic cylinder |
GB2511745B (en) * | 2013-03-11 | 2017-05-03 | Jonic Eng Ltd | Telescopic hydraulic piston arrangement |
EP2924300B1 (en) * | 2014-03-27 | 2018-05-30 | Wipro Infrastructure Engineering Oy | A telescopic hydraulic cylinder and a cover tube of a telescopic hydraulic cylinder |
AU2015245617B2 (en) * | 2014-04-07 | 2019-05-16 | Caterpillar Inc. | Sleeve holder for a hydraulic cylinder |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2004117A1 (en) * | 1969-02-14 | 1970-09-03 | Nummi Oy | Arrangement on a telescopic cylinder |
US3805681A (en) * | 1972-11-22 | 1974-04-23 | Towmotor Corp | Lift cylinder assembly for lift truck mast and carriage |
GB1590773A (en) * | 1976-08-20 | 1981-06-10 | Telehoist Ltd | Telescoping mechanisms |
DE4011119A1 (en) * | 1990-04-06 | 1991-10-10 | Walter Neumeister | PISTON CYLINDER AGGREGATE |
CN2937587Y (en) * | 2006-07-28 | 2007-08-22 | 中煤张家口煤矿机械有限责任公司 | Single-acting expansion hydro-cylinder |
CN201326604Y (en) * | 2008-11-07 | 2009-10-14 | 山东临清迅力变压器有限公司 | Novel telescopic sleeve hydraulic hoist cylinder |
CN201568395U (en) * | 2009-12-15 | 2010-09-01 | 东风汽车公司 | Hydraulic cylinder barrel for stepless flexible sleeve |
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2010
- 2010-12-16 EP EP10195427A patent/EP2466156A1/en not_active Withdrawn
-
2011
- 2011-12-13 EP EP11193278.6A patent/EP2466157B1/en active Active
- 2011-12-13 CN CN201110414287.9A patent/CN102588381B/en active Active
- 2011-12-13 TR TR2018/02819T patent/TR201802819T4/en unknown
- 2011-12-13 BR BRPI1106869-8A patent/BRPI1106869B1/en active IP Right Grant
Non-Patent Citations (1)
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Also Published As
Publication number | Publication date |
---|---|
EP2466156A1 (en) | 2012-06-20 |
TR201802819T4 (en) | 2018-03-21 |
CN102588381B (en) | 2016-01-20 |
BRPI1106869B1 (en) | 2021-03-09 |
BRPI1106869A2 (en) | 2013-04-09 |
CN102588381A (en) | 2012-07-18 |
EP2466157A1 (en) | 2012-06-20 |
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