CN102588381A

CN102588381A - Telescopic hydraulic cylinder

Info

Publication number: CN102588381A
Application number: CN2011104142879A
Authority: CN
Inventors: M.P.C.O.莫尔塔默
Original assignee: Hyva Holding BV
Current assignee: Hyva Holding BV
Priority date: 2010-12-16
Filing date: 2011-12-13
Publication date: 2012-07-18
Anticipated expiration: 2031-12-13
Also published as: EP2466156A1; TR201802819T4; CN102588381B; EP2466157B1; BRPI1106869B1; BRPI1106869A2; EP2466157A1

Abstract

The invention concerns a telescopic hydraulic cylinder comprising two or more concentric cylindrical tubes and a piston; 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, for in the extended position limiting further extending axial movement an inner tube (20,21,22,23) or piston has an outer stop ring (35) mounted in an outer groove in its outer surface and an outer tube or base tube has an inner stop ring (36) mounted in an inner groove in its inner surface. In accordance with the invention adjacent to the outer groove there is an outer relieve groove.

Description

Scalable oil hydraulic cylinder

Technical field

The present invention relates to a kind of as described in the preamble scalable oil hydraulic cylinder according to claim 1.

Background technique

In known scalable oil hydraulic cylinder, lateral forces is at the piston that stretches or manage the similar moment of flexure in the moment of flexure in said lateral force causes in the lower end of pipe and the adjacent top of concentric outerhose.Flexural stress during this moment of flexure causes managing and concentrate, and concentrated the breaking of can causing managing of said flexural stress and stress near the stress that the cross section flip-flop of the pipe of inside groove causes.Because the stress during high fluid pressure also causes managing and this can increase flexural stress, the high fluid pressure in the scalable oil hydraulic cylinder has increased the risk of breaking.

In order to increase the resistivity of scalable oil hydraulic cylinder, can provide according to claims 1 described scalable oil hydraulic cylinder to crooked and axial force.In this way, through being reduced in cross section, remain under the high tensioning state in the long extension of Guan Zaigeng, but the stress of pipe is concentrated and is reduced and the resistivity of bending is increased than the high capacity of the pipe on the longer length of the width of water jacket part.

Document EP 0450501 discloses the scalable oil hydraulic cylinder with interior stop ring and outer stop ring.Stop ring 45.1 and outer stop ring 45.2 in Fig. 5-6 shows, and between these two rings, be central ring 35H or central ring 35H and 35H2.The effect of central ring is an improvement direction, loads on the said direction stop ring is applied effect.In order to adapt to the central ring of sufficient size, the groove that is used for central ring is adjacent to inside groove and water jacket.This groove has the more shallow degree of depth, and its degree of depth does not extend to greater than 50% of the degree of depth of inside groove or water jacket.Fig. 7 shows like configurations, and wherein the degree of depth of groove is also significantly less than 50% of the degree of depth of inside groove or water jacket.Because their small depth, these grooves are not reduced in the cross section than the high capacity part of the pipe on the longer length of the width of water jacket, the stress of not removing thus in the water jacket is concentrated.This means that this existing technology document is openly the present invention, and said document does not provide groove and has the enlightenment that helps reduce the stress in the pipe.

Summary of the invention

According to a mode of execution, scalable oil hydraulic cylinder is according to claim 2.In this way, increase in the resistivity of the other end of managing bending.

According to a mode of execution, scalable oil hydraulic cylinder is according to claim 3.In this way, on a suitable segment length, the minimum sectional area of pipe increases, thereby the cross section of avoiding causing stress to be concentrated increases suddenly.

According to a mode of execution, scalable oil hydraulic cylinder is according to claim 4.In this way, ridge can make stop ring remain on position and/or compensating groove (relief groove) on its pipe and can be machined to the several narrow groove that the groove with bigger width has same effect.

According to a mode of execution, scalable oil hydraulic cylinder is according to claim 5.In this way, the contact area between the extended position stop ring is bigger, so that the surface stress between the said stop ring reduces.

According to a mode of execution, scalable oil hydraulic cylinder is according to claim 6.In this way, less, the more shallow and stress of interior snap ring groove and/or outer snap ring groove is concentrated littler.

According to a mode of execution, scalable oil hydraulic cylinder is described according to claim 7 or 8.In this way, pipe has small wall thickness so that alleviate the weight of scalable oil hydraulic cylinder.

Description of drawings

The present invention is to use accompanying drawing and under the help of one or more mode of executions, is set forth, in the accompanying drawings:

Fig. 1 shows the stereogram that promotes the dumping car of dump body with scalable oil hydraulic cylinder;

Fig. 2 shows the stereogram of the scalable oil hydraulic cylinder that is used to promote dump body;

The sectional view of the scalable oil hydraulic cylinder of Fig. 2 that Fig. 3 shows at retracted position;

The details of the transition point between two pipes of the scalable oil hydraulic cylinder of Fig. 2 that Fig. 4 shows in extended position; And

Fig. 5 shows the various mode of executions of compensating groove of pipe of the scalable oil hydraulic cylinder of Fig. 2.

Embodiment

Fig. 1 shows the dumping car 1 that comprises tractor 4 and trailer 5.Hinge 8 connects the framework and the tipping-body 2 of trailers 5, thereby and scalable oil hydraulic cylinder 3 can be promoted to oblique position with tipping-body 2 and makes tipping-body 2 dischargings.Trailer 5 has axle, has wheel on the said axle so that with the frame supported of trailer 5 on the ground.Hinge 8 slight inclination thereupon thereby but said ground can have mound 6 rear axles, 7 slight inclination, trailer 5 has slight distortion thus.The inclination of hinge 8 can cause tipping-body 2 with respect to trailer 5 lateral movements, and under extreme case, this mobile overturning that can cause dumping car 1 during tipping-body 2 promotes.During discharging, be that tipping-body 2 provides support through the edge with respect to trailer 5 horizontal directions, scalable oil hydraulic cylinder 3 can make tipping-body 2 reduce with respect to the lateral movement of trailer 5.

Fig. 2 and Fig. 3 show scalable oil hydraulic cylinder 3.Two chassis brackets 13 are installed on the trailer 5 and support two chassis gudgeons 12, said chassis gudgeon 12 brace foundation pipes 14.Basis pipe 14 can pipe spin axis 28 rotates around the basis in chassis bracket 13; Said basis pipe spin axis 28 is mounted to the axis that is parallel to hinge 8.Basis pipe 14 has center line 24, base plate 29 and high pressure joint 15.Pipe 23 can be managed on the basis in 14 along the direction of center line 24 and slided.Pipe 22 can the direction along center line 24 slide in pipe 23.Pipe 21 can the direction along center line 24 slide in pipe 22.Pipe 20 can the direction along center line 24 slide in pipe 21.At the retracted position of scalable oil hydraulic cylinder 3, but base plate 29

support tubes

20,21,22 and 23.Piston 19 can the direction along center line 24 slide in pipe 20.Shown mode of execution has can be with respect to 4 pipes of piston 19 with basis pipe 14 slips, and in other embodiments, the quantity of this pipe can be to surpass any numerical value of 0.

Piston 19 is formed from tubes, and seals through plug 17 through plate 30 sealings and at the top at downside.Plug 17 links to each other with top board 18 and top board 18 is connected to display pipe 9.The ball collar 27 that is attached to display pipe 9 supports enhancing ring 16 through promoting gudgeon 11, and said lifting gudgeon 11 is rotatably connected said enhancing ring 16 to promoting carriage 10.Enhancing ring 16 can spin axis 25 rotations around the top.Promote carriage 10 scalable oil hydraulic cylinder 3 is attached to tipping-body 2, top spin axis 25 is managed the axis that spin axis 28 is parallel to hinge 8 with the basis thus.Alignment errors between the axis of the spherical bearing 27 compensation top spin axiss 25 between enhancing ring 16 and the ball collar 27, basis pipe spin axis 28 and hinge 8.As described, tipping-body 2 connects with piston 19, and the position of piston 19 in the scalable oil hydraulic cylinder 3 is confirmed in the position of tipping-body 2.

Basis pipe 14 and manage 20,21,22 and 23 and all have groove, Sealing 37 at top end near their internal surfaces be installed in the said groove with basis pipe 14,

pipe

20,21,22 23 or piston 19 between clearance seal.Each Sealing 37 all can slide on the outer surface of

adjacent tubes

20,21,22 or 23 or on the outer surface of piston 19, and Sealing 37 is applicable to the high pressure in the scalable oil hydraulic cylinder 3 and zone in the scalable oil hydraulic cylinder 3 and surrounding environment are sealed.Scraper ring 40 is installed in basis pipe 14 and manages in the groove on top of 20,21,22 and 23 internal surface, with pollutant from manage 20,21,22 and 23 and the outer surface of piston 19 remove and prevent that dirt from getting into said gap.Be guiding piston 19; Pipe 20,21,22 and 23 and basis pipe 14 internal surface relative to each other on have the last wear ring 39 at the top that is installed in groove; On said wear ring 39 below have following wear ring 38, and have in the bottom and be installed in the slider 33 in the groove of outer surface.Last wear ring 39 and following wear ring 38 are installed between Sealing 37 and the scraper ring 40.

Through high pressure joint 15 pressure fluid is filled into scalable oil hydraulic cylinder 3, makes pressure fluid get into the gap between basis pipe 14,

pipe

20,21,22,23 and the piston 19, thereby pass the space that hole 34 arrives between said piston 19 and the base plate 29.Pressure fluid upwards promotes piston 19 and around the

pipe

20,21,22 and 23 of piston 19.Enhancing rings 31 are guaranteed to manage 20,21,22 and 23 and are moved along direction upwards with piston 19 in outer enhancing ring 32 or slider 33 are interactive.Interior enhancing ring 31 is installed in the groove of

pipe

20,21,22 and 23 internal surface.Outer enhancing ring 32 is installed in piston 19 and manages in the groove of 20 and 21 outer surface.Slider 33 is managed in 22 to play a role with outer enhancing ring 31 similar modes.

When the outer stop ring 35 of pipe 23 was managed 14 interior stop ring 36 interaction effects with the basis and managed 23 its maximum extension position of arrival, moving up of pipe 23 stopped.Outer stop ring 35 is installed in piston 19 and manages in the groove of 20,21,22 and 23 outer surface.Interior stop ring 36 is installed in basis pipe 14 and manages in the groove of 20,21,22 and 23 internal surface.

Pressure fluid upwards promotes piston 19 and manages 20,21 and 22 to the further filling of scalable oil hydraulic cylinder 3, up to the outer stop ring 35 and interior stop ring 36 interaction effects of managing 23 of pipe 22, and manages 22 its maximum extension position of arrival.The further filling of scalable oil hydraulic cylinder 3 impels pipe 21, pipe 20 and piston 19 to arrive their maximum extension position in succession.Scalable subsequently oil hydraulic cylinder 3 arrives its maximum extension position and tipping-body 2 arrives its maximum emptying position.

From scalable oil hydraulic cylinder 3 releasing pressurized fluids that stretch piston 19 is moved down pipe 20, up to the downside and interior enhancing ring 31 interaction effects of managing 20 of piston 19.The further release of pressure fluid causes piston 19 and pipe 20 to move down, up to the outer enhancing ring 32 and interior enhancing ring 31 interaction effects of managing 21 of pipe 20.

Pipe

21,22 and 23 shrinks in basis pipe 14 in a similar fashion, arrives its retracted position up to scalable oil hydraulic cylinder 3.

Fig. 4 show between pipe 22 and the pipe 23 when they be in extended position and interior stop ring 36 and outside transition point during stop ring 35 interaction effects.Shown transition point for basis pipe 14,

pipe

20,21,22 and 23 and piston 19 between other transition points for be exemplary, and shown transition point and

other pipes

20,21, basis manage 14 and piston 19 between transition point be similar.

As stated, scalable oil hydraulic cylinder 3 passes through transverse force F _HThe horizontal of tipping-body 2 that is applied to stable firmly lifting on the tipping-body 2 moves.This transverse force F _HMoment M in the scalable oil hydraulic cylinder 3 that causes stretching, and this moment M is the highest near trailer 5 places.This moment M causes managing 14,20,21,22 and 23 bendings in a longitudinal direction, and the circular section of said

pipe

14,20,21,22 and 23 is deformed into slight oval cross section.This means that moment M causes basis pipe 14 and manages the flexural stress in 20,21,22 and 23.

The position of the transition point between pipe 22 and pipe 23, moment of flexure is identified as moment M _22-23Moment M _22-23Cause power P and slider 33 and the power Q that manages between 23 the internal surface between wear ring 39 and pipe 22 the outer surface.This means, between last wear ring 39 and slider 33, manage 22,23 and all must transmit moment M _22-23And two pipes all receive flexural stress.In said zone, the groove of outer stop ring 35 and interior stop ring 36 reduces the intensity of

pipe

22,23, and said groove forms the most weak part of said pipe, especially interior pipe 22, and it has minimum diameter.Because the pipe in the scalable oil hydraulic cylinder 3 has the wall of relative thin so that alleviate its weight; So for water jacket; Said groove can have 20% the degree of depth greater than

pipe

22,23 wall thickness; And inside groove can have the degree of depth greater than its wall thickness 25%, thus make

stop ring

35,36 can be in adjacent tube 22, transmit axial force between 23.Thereby the stress of the bottom of the groove of the outer stop ring 35 of compensating groove 41 reductions and the risk that reduction damages.In another embodiment, the groove of the groove of compensating groove 41 contiguous outer stop rings 35 and contiguous interior stop ring 36.

Fig. 5 shows the various mode of executions of the compensating groove 41 in the outer surface of pipe.Fig. 5 a shows a mode of execution, the moving axially of the outer stop ring 35 of its medium and small ridge restriction, and wherein the degree of depth of compensating groove approximates the degree of depth of the groove of outer stop ring 35 greatly.The width of said ridge is less than the degree of depth of the groove of outer stop ring 35, and said ridge can have fillet in the bottom of compensating groove 41.Fig. 5 b shows a mode of execution, and wherein the bottom of compensating groove 41 groove of stop ring 35 outside being used for has long radius to outer diameter, and the width of said compensating groove 41 is at least 2 times of width that are used for the groove of outer stop ring 35.Fig. 5 c shows a similar mode of execution, and wherein compensating groove 41 has conical surface.The minimum diameter of compensating groove 41 approximates the diameter of the groove that is used for outer stop ring 35 greatly.In mode of executions of these back, outer stop ring 35 tightly moves axially preventing around said pipe clamp.Fig. 5 d is depicted as the further mode of execution of compensating groove, and the first narrow compensating groove 41 is spaced apart with the groove that is used for outer stop ring 35 through ridge, and the degree of depth of the first narrow compensating groove 41 of said mode of execution approximates the degree of depth of the groove that is used for outer stop ring 35 greatly.The width of the first narrow compensating groove 41 has fillet less than its degree of depth and its bottom.Shown in the dotted line among Fig. 5 d, in another embodiment, the second and the possible the 3rd narrow compensating groove contiguous said first narrow compensating groove 41 is provided with, and wherein said second groove and three-flute have the degree of depth that reduces.Outside being used for, be the ridge that approaches between the groove of stop ring 35, first, second and/or the 3rd compensating groove, the thickness of said thin ridge is less than the degree of depth of the water jacket that is used for stop ring.In the internal surface of pipe, compensating groove 41 can have similar size.

Claims

1. a scalable oil hydraulic cylinder (3) comprises piston (19) and two or more concentric stylostomes (14,20,21; 22,23), Sealing (37) is between said stylostome and said piston; Said thus stylostome and said piston can relative to each other move axially between retracted position and extended position, interior pipe (20,21; 22; 23) or piston have the outer stop ring (35) in the installation water jacket on its outer surface, and outer tube or basis pipe have the interior stop ring (36) in the inside groove that is installed on its internal surface, so that move in the extended position limit axial; It is characterized in that, be provided with the outer compensating groove (41) that the degree of depth approximates the degree of depth of said water jacket greatly at the contiguous said water jacket of the side away from the end of said pipe of said water jacket.

2. scalable oil hydraulic cylinder as claimed in claim 1, wherein the contiguous said inside groove of the side away from the end of said pipe at said inside groove is provided with the interior compensating groove that the degree of depth approximates the degree of depth of said inside groove greatly.

3. according to claim 1 or claim 2 scalable oil hydraulic cylinder; The width of wherein said outer compensating groove (41) is at least 2 times of width of said water jacket; And/or said in the width of compensating groove be at least 2 times of width of said inside groove, and wherein said compensating groove can have the degree of depth that reduces along with change width on the direction away from water jacket or inside groove.

4. like each described scalable oil hydraulic cylinder in the aforementioned claim, wherein said outer compensating groove and/or said interior compensating groove have ridge, and the width of said ridge is less than the degree of depth of said water jacket or inside groove.

5. like each described scalable oil hydraulic cylinder in the aforementioned claim, wherein said interior stop ring (36) and/or said outer stop ring (35) have the rectangular cross-section.

6. like each described scalable oil hydraulic cylinder in the aforementioned claim, wherein said interior stop ring and/or said outer stop ring have hexagonal cross-section.

7. each described scalable oil hydraulic cylinder as in the aforementioned claim, the degree of depth of wherein said water jacket is greater than 20% or 30% of the wall thickness of said pipe.

8. each described scalable oil hydraulic cylinder as in the aforementioned claim, the degree of depth of wherein said inside groove is greater than 15% or 25% of the wall thickness of said pipe.