CN102454662A

CN102454662A - Fluidically operated linear driving mechanism with terminal damping device

Info

Publication number: CN102454662A
Application number: CN2011103450459A
Authority: CN
Inventors: S.施托尔茨
Original assignee: Festo SE and Co KG
Current assignee: Festo SE and Co KG
Priority date: 2010-11-06
Filing date: 2011-11-04
Publication date: 2012-05-16
Anticipated expiration: 2031-11-04
Also published as: EP2455620B1; EP2455620A1; CN102454662B

Abstract

A fluidically operated linear driving mechanism (1) is provided with a housing (2) and a drive unit (14) which can linearly move relative to the housing and is provided with a driving piston (12). The linear driving mechanism is also provided with a terminal damping device (35). A preferable closing member (37) which is equipped on the drive unit (14) belongs to the terminal damping device. The closing member can sink into a control channel (28) at the housing side. An outflow cross section is closed through the sinking, so the compressed pressure medium can flow out through a throttling channel (52). The throttling channel (52) is provided in a closing member and appropriately passes through the closing member so the compressed pressure medium can flow into an attached control channel (28) through the throttling channel.

Description

The fluid actuated straight line driving mechanism that has the terminal damping device

Technical field

The present invention relates to a kind of fluid actuated straight line driving mechanism; It has housing and driver element; This driver element can move with respect to this housing straight line through applying fluid, and wherein this driver element has driven plunger, and this driven plunger is arranged on enclosure interior and is divided into two working rooms spaced apart from each other there; During the damping stage; By the braking of the terminal damping device of straight line driving mechanism, wherein this terminal damping device has closure member to this driven plunger near the housing relative with it first next door the time, and this closure member is arranged on the driver element and has annular seal lip in the side towards first next door of driven plunger; On the opposite of this closure member is the control channel mouth on first next door that is arranged on of control channel; This control channel is used for carrying out controlled fluid and applying being arranged at first working room between the driven plunger and first next door, and during the damping stage, closure member can suitably sink in this control channel; Make the wall hermetically mating reaction of sealing lip by sealing surface and control channel; Wherein the terminal damping device also has at least one throttling passage, and during the damping stage, said throttling passage provides the fluid of throttling to be connected between first working room and control channel.

Background technique

EP 2 047 116 B1 combine its Fig. 9 to introduce this straight line driving mechanism.This known straight line driving mechanism has driver element, and driver element has driven plunger and piston rod, and wherein driven plunger has been divided two working rooms spaced apart from each other in housing, and these two working rooms all are communicated with through the control channel in distolateral feeding.Straight line driving mechanism is equipped with two terminal damping devices, and these two terminal damping devices are responsible for one of two possible stroke directions of driver element separately, and respectively has a seal ring, sealing circle to place before the driven plunger and have the sealing lip of radially projection.During near one of its two stroke terminals, closure member sinks in the control channel on its opposite at driver element, and with this control channel sealing.Begin the damping stage thus; During this period; Before still only can be flowed out through the throttling passage that the transverse section reduces by the extruded pressure medium of crossing control channel of driven plunger; This throttling passage is made up of a plurality of cannelures under the situation of known straight line driving mechanism, and these cannelures are offered in the wall of fluid passage.But owing to realized reducing the outflow section that the voltage supply power media uses thus, so in the working room of outflow side, set up back pressure, this causes driver element to be delayed, thereby causes the collision of this driver element when arriving stroke terminal to receive damping.Although known straight line driving mechanism provides the damping of effective terminal, it still is expected to improve aspect manufacture cost.Realization can stipulate that the cannelure of throttling passage needs quite high technical costs when it is made.

DE 10 2,009 014 817 A1 also disclosed a kind of aspect the damping of terminal the straight line driving mechanism according to similar principles work.Wherein mention, throttling passage alternatively also can be incorporated in the shell body wall of straight line driving mechanism.

DE 102 61 412 A1 have put down in writing a kind of pneumatic linear actuator that has damping mechanism, and wherein driven plunger itself promptly is used for limiting the mechanism of the outflow section of extruded pressure medium.Throttling passage is incorporated in the piston body of driven plunger in this case.

With regard to US 2; 642; 845 disclosed straight line driving mechanisms, but the terminal damping device has the damped part of the axial compression of the bellows design of being similar to, at driver element during near stroke terminal; Control channel by the situation of fluid-tight ground blocking-up under, this damped part clings on the end face of closing cap of housing.In this make, throttling passage also is configured in the housing of straight line driving mechanism.

By the terminal damping device of the known pneumatic linear actuator of EP 1 041 293 A2 according to similar principle work.As the parts of the control channel that is used to seal the outflow side, here be provided with respect to driven plunger seal ring movably, but sealing circle elastic deflection ground clamps in advance.

Summary of the invention

The objective of the invention is, propose a kind of fluid actuated straight line driving mechanism, it has realizes terminal damping device simple and with low cost.

In order to realize this purpose; According to regulation of the present invention; At least one throttling passage is constructed in closure member, and suitably passes closure member in this case, makes that said throttling passage-observation-one side is passed in first working room with the first throttle passway in the damping stage; Be passed in the control channel with the second throttling passage mouth on the other hand, walk around sealing surface sealing lip and wall mating reaction control channel simultaneously.

In this way, throttling passage is the direct constituent element that also has the closure member of sealing lip.Being used to realize the manufacturing measure of sealing lip and throttling passage thereby concentrating on a unique member is closure, and this can realize the manufacturing of economical rationality.Owing to can save throttling passage in case side in order to guarantee damping function; So the present invention helps installing additional existing straight line driving mechanism, and can utilize housing that can make, no throttling passage in order to make the straight line driving mechanism that is equipped with or is not equipped with the terminal damping device with low costly.Though existing closure member has the multiple function that rolls into one-especially sealing function and throttling function according to the present invention; But still can realize, be equipped with the straight line driving mechanism of this closure member therefore can have very compact when needed size with very little length dimension.

With regard to straight line driving mechanism of the present invention; The damping stage causes that the stroke motion of driver element delays; Along with the sealing lip that preferably axially immovably is fixed on the closure member on the driver element enters into the control channel mouth on opposite, this damping stage has just begun.Control channel is blocked in this way, and separates with respect to the working room before it.But this separating not is to seal hermetically, but can let the fluid through throttling flow through the throttling passage that at least one passes closure member.Can form a kind of bypass flow through throttling thus, effective sealing surface of sealing lip is walked around in this bypass flow, preferably walks around whole sealing lip.Can set throttle degree according to the selected section size of throttling passage as required, and then set the damping degree.Although it is often just enough that a unique throttling passage with corresponding size only is set, closure member also can be equipped with the throttling passage of a plurality of parallel connections on function.

Favourable improvement of the present invention can be obtained by dependent claims.

Closure member is with respect to preferably design separately of driver element, wherein it can pull down ground or on-disconnectable be fixed on the driver element down.

Throttling passage is preferably suitably constructed in closure member, make its on sealing lip next door process, that is do not pass the sealing lip.This life-span to sealing lip is favourable, and the sealing lip under the situation that alternately extend in the control channel or from control channel, stretch out radial deformation usually takes place, especially the distortion due to the reversible bending of elasticity.

Closure preferably is provided with and carries section, and this carryings section is being carried with respect to its sealing lip of projection radially.A kind of link of material fit is preferably arranged between these two assemblies, and this link can make economically, and guarantees to connect reliably.

If be provided with the carrying section of being with sealing lip to closure, throttling passage just preferably only stretches in carrying section.Throttling passage can stretch point-blank, perhaps also can stretch agley.The straight line design can realize especially simply.

Preferred to carry section be annular design, wherein especially recommends sleeve shape, i.e. the design that reduces to some extent than axial length of wall thickness.Sealing lip preferably be arranged in this case carry section with the axially relative distolateral zone of driven plunger in.Annular carrying section is arranged with respect to driven plunger especially coaxially.

Closure member utilizes its annular to carry section and preferably is enclosed in and the axial inner chamber of a relative side opening of driven plunger.This inner chamber seals towards driven plunger, or correspondingly designs closure itself and realize sealing, or seals through driver element.These two kinds of sealing measures also can be combined.

Especially combine measures first mentioned; Advantageously; Throttling passage suitably passes closure, make its first throttle passway be arranged on the periphery surface of carrying section in the side towards driven plunger of sealing lip, and the second throttling passage mouth is positioned at enclosing on the face of carrying section.Making in this way flows through during the damping stage through the fluid of throttling carries the wall of section, and is flow into the control channel from first working room through carrying the inner chamber that section surrounds.

Can realize radially passing the wall of annular carrying section or the throttling passage of annular solid especially simply.

Regardless of the trend of throttling passage, under any circumstance all advantageously, two throttling passage mouths are arranged on the side towards driven plunger of the foundation section of sealing lip, and sealing lip is fixed on this foundation section and carries on the section.

Carried preferably annular chamber of section inner chamber that surrounds by annular.The producing method of this annular chamber does; The convexity that makes the axial projection of driver element leave driven plunger preferably extend into coaxially carries in the section; This convexity axially passes completely through whole closure member, and can also stretch out from closure member with the axial relative side of driven plunger.

If be provided with the piston rod that stretches out from housing to driver element, then this piston rod itself can directly form above-mentioned convexity.In this case, closure member is installed in a side of driven plunger, and piston rod also is positioned at this side.

Driver element can have at dorsal part and is inserted into the driven plunger on the piston rod, and wherein the axial side relative with piston rod in driven plunger is provided with fixing device, and this fixing device is used for being fixed on piston rod to driven plunger.This fixing device for example can have the thread protrusion of passing driven plunger of piston rod and be screwed to the set screw nut on this thread protrusion.If be arranged on closure member on the driven plunger in a side identical with fixing device, then fixing device can extend in the carrying section of annular under the situation that forms said convexity.

Annular is carried section and is produced axial lapping or nested thus with the convexity that driven plunger is left in projection; Closure member thereby can be built in the following manner in the driver element; Promptly; Although this driver element is equipped with the terminal damping device, also seldom take the axial installing space of straight line driving mechanism inside than the situation of endless damping device.

The carrying section of carrying sealing lip is the constituent element of the fixed body of closure member preferably, preferably can be fixed on closure member maybe with pulling down and can be fixed on the driver element by means of fixed body.

Fixed body is preferably annular design.It particularly can have the holding part of the central openings of dish type, carries the Duan Zaiyi side and is connected with this holding part coaxially, thereby produce a kind of jar of shape structure.Can be fixed on closure member on the driver element by means of holding part, means of fixation for example is that it utilizes its central hole to be inserted on the piston rod, and between driven plunger and piston rod or fixed mechanism, clamps.

Advantageously, closure member is a jar shape design on the whole, and has the diapire and the sidewall telescopic design, that carrying sealing lip of best perforate.Here, sidewall forms and carries section, and diapire forms holding part.In order to form at least one throttling passage, sidewall is preferably by partial penetration.

A kind of favorable structure regulation of closure member, this closure member has the support that is made up of rigid material, is molded on this support to the sealing lip material fit, particularly comes moulding according to two component Shooting Techniques.Support for example is made up of the metalwork through deep-draw, can seal this metalwork with the flexible plastic materials that forms sealing lip.Although still can guarantee to keep reliably sealing lip in order to produce load at work, support can have the support protrusion of radially projection, and this support protrusion supports the foundation zone of clamping sealing lip from behind, ground.

Straight line driving mechanism of the present invention can only be equipped with a terminal damping device, perhaps also can be equipped with two terminal damping devices.If only on a moving direction of driver element, realize the terminal damping, then a unique terminal damping device is just enough.If on two moving direction, carry out damping, just be equipped with two terminal damping devices, these two closure members that the terminal damping device preferably has same configuration to straight line driving mechanism.

Description of drawings

With reference to the accompanying drawings the present invention is detailed.Shown in the figure:

Fig. 1 is the longitudinal section of the favourable make of straight line driving mechanism of the present invention, and wherein driver element is in the stroke terminal of indentation;

Fig. 2 is the longitudinal section of the straight line driving mechanism of Fig. 1, and wherein driver element is in second stroke terminal that stretches out;

Fig. 3 is the three-dimensional separate views of the driver element that in the straight line driving mechanism of Fig. 1 and 2, uses;

Fig. 4 is the three-dimensional separate views from top view of the closure member that in the parts according to Fig. 1 to 3, uses;

Fig. 5 is the stereo rearview of the closure member of Fig. 4; With

The longitudinal section that Fig. 6 dissects for the cutting line VI-VI by Fig. 5 of closure member.

Embodiment

Fluid actuated straight line driving mechanism with label 1 mark especially is designed to utilize pressurized air or another kind of pressurized gas to handle on the whole, but also can utilize liquid compressed media to come work.

Straight line driving mechanism 1 has microscler slightly housing 2, and this housing has the longitudinal axis 3 that is preferably placed at the cross section centre.In the inside of housing 2 individual inner chamber 4 is arranged, this inner chamber distolateral by first next door 5 of housing 2 and the sealing of second next door 6, second next door longitudinal axis 3 axially on spaced apart with respect to first next door.In two next doors 5, extending the body 7 of housing 2 between 6, the inner face of this body forms the working surface of piston 8 that is arranged on the driven plunger 12 in the inner chamber 4.

Next door 5,6 preferred design become cover piece, and they install on two end faces of body 7 under the situation of sealing.All there is an internal face 13 towards driven plunger 2 in each next door 5,6, and said internal face for example is used as the stop surface of driven plunger 12, so that two possible stroke terminals of regulation driven plunger 12.Alternatively, also can before the internal face that is used to form stop surface 13, settle a shock absorber again.

Driven plunger 12 is constituent elements of driver element 14, this driver element can longitudinal axis 3 axially on move with respect to housing 2.This driver element for example also comprises piston rod 15, and this piston rod and driven plunger 12 are formed a member.Piston rod 15 is stretching out from driven plunger 12 towards the distolateral of second next door 6, and under the situation of sealing, is passed in the wall perforation 16 of structure in second next door 6.Drawn at 17 places at the wall seal ring 17 of 16 internal fixation on second next door 6 of boring a hole, the sealing circle surrounds piston rod 15 under the situation of sealing.Outside housing 2, piston rod 15 has a power acting section 18, on this power acting section, can adopt releasable particular form fixing the assembly that will move.

Move through straight line, driver element 14 can move between visible second stroke terminal at first stroke terminal visible by Fig. 1 and by Fig. 2.First stroke terminal also can be called the stroke terminal of indentation, because driver element 14 here farthest is retracted in the housing 2 to the greatest extent.The prescribed manner of first stroke terminal 1 of this indentation is to make driven plunger 12 abut on the internal face 13 in first next door 5.

Second stroke terminal according to Fig. 2 also can be called the stroke terminal that stretches out, because driver element 14 here farthest stretches out from housing 2 to the greatest extent.The prescribed manner of second stroke terminal that this stretches out is to make driver element 14 abut on the internal face 13 in second next door 6 with its driven plunger 12.

Driven plunger 12 is divided into inner chamber 4 first working room 22 and second working room 23 that is positioned at second next door, 6 those sides that is positioned at first next door, 5 those sides.The best fluid-tight of this division ground carries out, and for this reason, driven plunger 12 has the sealed member 24 of annular in the zone of its excircle, abut on the working surface of piston 8 to the dynamic seal (packing) of sealing parts.In order to obtain the guiding of high-quality straight line, driven plunger 12 can also slidably abut in the guided rings 25 on the working surface of piston 8 movably having at least one on its excircle.

Preferably also as damping device, it relaxes in the collision that stroke terminal takes place driven plunger 12 sealed member 24.It has the buffering convexity 26 of the rubber elasticity of one or more axial protrusions for this reason, and driven plunger 12 utilizes said buffering convexity to abut on the internal face 13 at stroke terminal.These bufferings protruding 26 also can be independent of sealed member 24 and design.In addition, these bufferings protruding 26 also can be positioned on the next door 5,6.

For the to-and-fro motion 27 of the straight line that causes driver element 14, can adopt mode coordinated with each other controllably to give two pressure mediums that working

room

22,23 applies with fluid.This controlled pressure applies by first control channel 28 that is communicated with first working room 22 and second control channel 29 that is communicated with second working room 23 and is undertaken.Two

control channels

28,29 are on the other hand respectively with the interface 32 outer outer surfaces that are extended down to housing 2.On each interface 32, can connect unshowned control valve unit through fluid circuit; This control valve unit is connected with pressure source; And can be fed into pressure medium in the

working room

22,23 that connects separately selectively through the

control channel

28,29 of attaching troops to a unit separately, perhaps from said working room, discharge.

Control channel

28,29 is passed the wall of housing 2.Preferably, first control channel 28 is only extended in first next door 5, and second control channel 29 only stretches in second next door 6.

Each

control channel

28,29 all is passed in the

working room

22,23 of attaching troops to a unit through the control channel mouth 33 of inside.Inner control channel mouth 33 is positioned on first next door 5 for first working room 22, and is positioned on second next door 6 for second working room 23.Each inner control channel mouth 33 is all put with driven plunger 12 coaxially relatively.For this reason, it for example occupy the plane and is arranged in medially on the internal face 13 of attaching troops to a unit.

Can access flow restricted cross sectional part 34 in the extending part of one or two

control channel

28,29, it has stipulated the flowing velocity of the maximum possible of pressure medium.This permission is restricted to the travel speed of control piston 12 on the desirable degree.

In order to make driver element 14 also can be equipped with at least one terminal damping device for straight line driving mechanism 1 when needed with very high travel speed work.For example carry out dual outfit, or rather, when arriving first stroke terminal, utilize the first terminal damping device 35 to carry out damping, and when arriving second stroke terminal, utilize the second terminal damping device 36 to carry out damping.Two preferably designs symmetrically of

terminal damping device

35,36 are so mainly further set forth the first terminal damping device 35.Relevant therewith argumentation correspondingly also is applicable to the second terminal damping device 36, as long as under concrete condition, do not do other explanation.

If only on a unique stroke directions, carry out the terminal damping, so also can save in these terminal damping devices.

Each

terminal damping device

35,36 all makes during near stroke terminal the travel speed of driver element 14 during moving between two stroke terminals reduce at driver element 14.The acting in this case stage of terminal damping device is called the damping stage.This damping stage be confined to driver element 14 range be right after the regional area before the corresponding stroke terminal.

Carrying out from second stroke terminal that stretches out when driver element 14 under the situation of the first stroke motion 27a of the indentation this embodiment near first next door 5, and thereby when arriving first stroke terminal of indentation, the first terminal damping device 35 works.The second terminal damping device 36 is put upside down at driver element 14 under the situation of stroke directions and is worked, i.e. this moment, this driver element under the situation of carrying out the second stroke motion 27b near second next door 6, so that final second stroke terminal that stretches out that arrives.

Each

terminal damping device

35,36 all has a closure member 37 as main constituent element, and this closure member is to be fixed on the driver element 14 and particularly discrete thus member.Fig. 4 to 6 at length shows this closure member 37.

The closure member 37 of the first terminal damping device 35 is positioned at the side towards first next door 5 of driven plunger 12.The closure member 37 of the second terminal damping device 36 is positioned at the opposite side towards second next door 6 of driven plunger 12.Thereby respectively there is a closure member 37 to be positioned at the axial both sides of driver element 12 in this embodiment.Each closure member all is with respect to driven plunger 12 and the piston rod 15 that exists in case of necessity member independently.

Here need explanation, driver element 14 also can have so-called coherent piston rod, and this piston rod runs through housing 2 vertically fully, and is different from this embodiment, and it not only runs through second next door 6, and runs through second next door 5.Straight line driving mechanism 1 also can be the piston-rodless type; And has the power effect part that externally is arranged on the housing 2; This power effect does not partly have piston rod, and for example pure magnetically or the accessory of the vertical slit through running through body 7 and driven plunger 12 motion couplings couplet.

In this embodiment's particularly advantageous make, closure member 37 is essentially a jar shape design at least.It has at this and in middle section, is provided with through hole 38 thereby perforated diapire 42, and this diapire preferably has the shape of annular disk.In addition, this closure member has the sidewall 43 of telescopic design, and this sidewall and diapire 42 arrange coaxially, and is connected with the outward edge of diapire 42, and this sidewall is from axially leaving diapire 42 and stretch to a direction at longitudinal axis 44 here.

Closure member 37 also has the sealing lip 45 with the concentric annular of longitudinal axis 44, and the sealing lip is arranged on the sidewall 43, or rather, be preferably disposed on sidewall 43 with the axially relative end regions of diapire 42 in.Sealing lip 45 makes it from sidewall 43 radial outward projections, but is preferably with stacked axial component through suitably arranging and design.Correspondingly; Sealing lip 45 is from being positioned at a distance foundation zone 46 of inner radial (sealing lip with said foundation area arrangements on sidewall 43); When having radial outward axially backward towards the slant dilation portion of diapire 42; So that finally stopping with foundation zone 46 relative outer end region freely 47, the annular sealing surface 48 concentric that this outer end region has a radial outward with longitudinal axis 44.

Spaced radial between sealing lip 45 and the sidewall 43 thereby 46 increase to outer end regions 47 from foundation zone.

But sealing lip 45 is the distortion of elastic return ground diametrically.It thus can be radially inwardly towards sidewall 43 bendings, and after removing corresponding power, get back to the initial position that farthest leaves sidewall 43 again automatically.

Another characteristics of closure member 38 are the fluid passages as throttling passage 52.Closure member 37 can be equipped with a plurality of this throttling passages 52 in principle, but it has only a unique this throttling passage 52 in this embodiment.This throttling passage 52 preferably is arranged in sidewall 43, and this sidewall is radially got through in order to realize throttling passage 52 partly.But throttling passage 52 under any circumstance all is the constituent element of closure member 37, and in closure member 37 structure, and to be arranged in which zone of closure member 37 irrelevant with throttling passage 52, wherein this throttling passage runs through closure member 37.

The structure of being made up of diapire 42 and sidewall 43 is used for being fixed on driver element 14 to closure member 37 on the one hand, during the damping stage, bears the block function that waits to introduce on the other hand.Thereby followingly also call blocking-up-fixed body 54 to this structure.

In the inside of blocking-up-fixed body 54, sidewall 43 forms the carrying section 55 of carrying sealing lips 45, and diapire 42 then formation is mainly used in and is fixed on the holding part 56 on the driver element to closure member 37.During the damping stage, also bear block function owing to carry section 55 in this embodiment, so it also can be called the blocking-up section.In other words, sidewall 43 is used as the blocking-up of combination in an advantageous manner and carries section in this embodiment.

Correspondingly, under decision design situation shown in the closure member 37, the carrying section 55 of the preferred sleeve shape of an annular is arranged, sealing lip 45 be fixed on this carryings section with its foundation zone 46 with holding part 56 axial relative end regions or distolateral.

Each closure member 37 all is installed on the driver element 14 with coaxial direction.The longitudinal axis 44 of closure member 37 thereby overlapping with longitudinal axis 3.Closure member 37 through suitably design, make its diapire 42 towards driven plunger 12, thereby the back side of closure member 37 is also towards this driven plunger at this.Closure member 37 axially leave driven plunger 12 with diapire 42 axial relative front end area 57.The front end area 57 of closure member 37 that makes the terminal damping device 35 of winning in this way is towards first next door 5, and the front end area 57 of the closure member 37 of the second terminal damping device 36 is towards 6 projections of second next door.

Because this arrangement, make each sealing lip 45 all be in before the driven plunger 12 with axially spaced-apart." jar mouth " of jar shape closure member 37 leaves driven plunger 12 respectively.Closure member 37 is installed through preferred, make they with the back side that axially deviates from sealing lip 45 58 of its diapire 52 or its holding part 56 abut in driven plunger 12 respectively towards end face 62 on.

Because existing through hole 38, closure member 37 can be inserted on the piston rod 15 when mounted, and axially immovably between piston rod 15 and driven plunger 12, clamps.

Piston rod 15 preferably has step on it is axial, and has the rod end section 63 that is arranged in the inner chamber 4, on this rod end section, on the direction of power acting section 18, is connecting larger-diameter bar principal piece 64 through annular step 65.Annular step 65 forms towards the surface of contact 65a of the annular of rod end section 63.

Two closure members 37 are inserted on the rod end section 63 with driven plunger 12, and wherein this rod end section 63 passes the perforation 66 of central authorities of through hole 38 and the driven plunger 12 of closure member 37.Here; The closure member 37 of the second terminal damping device 36 abuts on the surface of contact 65a of annular step 65 with 58 axial relative fronts, the back side with holding part 56; In addition, two closure members 37 are supported on the end face respect to one another 62 of driven plunger 12 with its back side 58.Aforementioned components utilizes piston rod 15 to clamp through fixing device 67, and this fixing device extend into the inner chamber 68 that is surrounded by the closure member 37 of the first terminal damping device 35 from driven plunger 12 according to the mode of convexity coaxially.In this embodiment, fixing device 67 has that length sections by rod end section 63 constitutes and is provided with externally threaded threaded sections 72 and is screwed to the set screw nut 73 on this threaded sections 72.Also at least one packing ring 74 can be set between the holding part 56 of set screw nut 73 and closure member 37 selectively again.

Set screw nut 73 is twisted enough tightly, so as to make two holding parts 56 with driven plunger 12 to be clamped between the surface of contact 65a and set screw nut 73 of annular step 65 with respect to piston rod 15 axial immovable modes.

Fixing device 67 extend in the inner chamber of closure member 37; The carrying section 55 of this closure member has the inner diameter bigger than the outer diameter of fixing device 67; Produce radial concentric ground thus at the annular chamber 75 that carries between section 55 and the fixing device 67, this annular chamber towards with driven plunger 12 axial relative side openings.

Between the bar principal piece 64 of the carrying section 55 of the closure member 37 of the second terminal damping device 36 and piston rod 15, this bar principal piece is passed said closure member 37 coaxially with one heart in corresponding annular chamber 75.

Generally speaking, no matter fixing device 67 still is a bar principal piece 64 all forms the convexity in the inner chamber 68 that extend into the closure member 37 of attaching troops to a unit, thereby produces said inner chamber 75.

Through throttling passage 52, between the section at the radially outer of closure member 37 of annular chamber 75 and the working room that wherein is provided with closure member 37 22,23, produce continual fluid and be connected.Throttling passage 52 has the first throttle passway 76 and the second throttling passage mouth 77; The first throttle passway for example is positioned at outer placing sidewall 43 or that carry section 55; The second throttling passage mouth is arranged on blocking-up and the inner face of fixed body 54, and be preferably placed at sidewall 43 or carry sections 55 in place.Throttling passage preferably only extends in carrying section 55, and wherein it is preferably in the annular solid that upwards passes this carrying section 55 with respect to the footpath of longitudinal axis 44.

First throttle passway 76 axially is positioned at outer the placing of carrying section 55 between the foundation zone 46 of driven plunger 12 and sealing lip 45.Two throttling passage mouths 76,77 preferably are positioned at the side towards driven plunger 12 in this foundation zone 46.Be independent of the design conditions of closure member 37, advantageously, throttling passage 52 does not pass sealing lip 45, but sealing lip 45 is walked around by throttling passage 52 on the whole.We can say that also the sealing lip 45 that throttling passage 52 is arranged in the closure member 37 is neighbouring or outside.

During to-and-fro motion 27, axially be arranged in sealing lip 45 before the driven plunger 12 and pass with it coaxial relative internal control passway 33 and sink to the

control channel

28,29 of attaching troops to a unit, begin the said damping stage this moment.This sink to brought be, sealing lip 45 with its annular sealing surface 48 under the situation of sealing with surrounding wall 78 contacts of

relevant control channel

28,29, and under the situation that this sealing of maintenance contacts on this surrounding wall 78 endwisely slipping along longitudinal axis 3.

Sealing lip 45 makes to be in it during the initial position outside the

control channel

28,29 at sealing lip 45 that its diameter in sealing surface 48 zones is greater than the inner diameter of

control channel

28,29 in surrounding wall 78 zones of preferred slotless structure through particular design.This causes being applied power at radially outer by surrounding wall 78 under the situation of sealing lip 45 in extending into

control channel

28,29, and with one heart radially to internal strain.Here the reaction force that is produced makes sealing surface 48 be pressed against on the surrounding wall 78 with enough big sealing force.

With regard to this embodiment's straight line driving mechanism, common terminal damping process is carried out in the following manner, wherein thinks, driver element 14 at first is positioned at the second visible stroke terminal by Fig. 2.

In order to cause the first stroke motion 27a of driver element 14 from second stroke terminal; Correspondingly handle the control valve unit that is connected with

control channel

28,29; Make that thus the pressure medium that is under the atmosphere high pressure is fed in second working room 23 through second control channel 29, and first working room 22 is eased off the pressure through first control channel 28 that is communicated with it or is ventilated simultaneously.Because towards 5 motions of first next door, this driver element enters into housing 2 in this case under the situation of carrying out the first stroke motion 27a for the pressure difference that forms two working rooms 22, between 23 in this case, driver element 14.In the said first stroke motion 27a, driven plunger 12 is released the pressure medium that still is arranged in first working room 22 at present through the control channel 28 of not blocking-up.

Consequently, driver element 14 with high relatively clean travel speed near first next door 5.

But bump against on the internal face 13 in first next door 5 in driven plunger 12 before, the sealing lip 45 that is positioned at the closure member 37 before the driven plunger 12 of the first terminal damping device 35 arrives the internal control passway 33 of first control channel 28, and begins to sink among the latter.The beginning in Here it is described damping stage.

In case sealing lip 45 contacts with the surrounding wall 78 that in coaxial prolongation, is connected the length sections on the inner chamber 4 of first control channel 28 hermetically, first control channel 28 is just with respect to 22 blocking-up of first working room.Throttling passage 52 keeps as unique being connected between first control channel 28 and first working room 22.This causes the outflow section that now greatly reduces, the cross section that is promptly provided by throttling passage 52 to the pressure medium that drived unit 14 is extruded being provided from first working room 22.Consequently in first working room 22, set up back pressure, it affacts on the driver element with the opposite braking force of the first stroke motion 27a, thereby this driver element greatly slowly continues its motion now, until arriving first stroke terminal.

Driver element 14 can reach second stroke terminal from the present second current stroke terminal; Its mode does; Corresponding control through to control

channel

28,29 is fed into the pressure medium that is under the high pressure in first control channel 28, and second working room 23 is eased off the pressure through connected second control channel 29.In this case, the closure member 37 that also sinks at the beginning in first control channel 28 stretches out from first control channel 28 again.But guaranteed at the very start to apply fluid in large area for the side towards first next door 5 of driver element 14; Because pressure medium can make sealing lip 45 radially curve inwardly; And break away from surrounding wall 78; Thereby the generation annular space, pressure medium can flow in first working room 22 through sealing lip 45 through this annular space.Sealing lip 45 thereby preferably also have check function.

Blocking-up and the above-mentioned block function of fixed body 54 so the carrying section 55 that causes it sink to from sealing lip 45 and just form partition wall the control channel 28, and this partition wall separates first working room 22 and first control channel 28.

The fluid stream that the throttling ground warp is crossed throttling passage 52 at first enters into from first working room 22 and is closed inner chamber 68 or the annular chamber 75 that part 37 surrounds, and rises therefrom and axially enter into ensuing first control channel 28.

Thereby during the damping stage, the annular chamber 75 of the closure member 37 of participation terminal damping at that time all is connected along the distolateral of its opening and ensuing first or

second control channel

28,29 fluid ground all the time.

Obviously visible by said working method; Throttling passage 52 should pass through suitable structure in closure member 37; Make it in the damping stage, walk around under the situation with the sealing surface 48 of surrounding wall 78 mating reactions of

control channel

28,29; One side is passed into its first throttle passway 76 and is arranged in closure member 37 working

room

22 or 23 on every side, directly or indirectly leads to the

control channel

28,29 of attaching troops to a unit with the second throttling passage mouth 77 on the other hand.Lead to indirectly at this and especially mean the make that exemplarily realizes, in view of the above, the second throttling passage mouth 77 directly is communicated with annular chamber 75, and just is communicated with ensuing

control channel

28,29 through this annular chamber 75.

But throttling passage 52 also can have other trend in principle.It especially can make its second throttling passage mouth 77 abut on the end face that deviates from driven plunger 12 that carries section 55 carrying the annular solid interior curve ground trend of section 55.Yet, radially pass the mode of structure of being realized in this embodiment of the throttling passage 52 that carries section 55 and on manufacturing technology, can realize significantly simply.

If the second stroke motion 27b that driver element 14 stretches out; Then, just carry out the terminal damping according to mode same as described above in case the sealing lip before this puts 45 of the closure member 37 of the second terminal damping device 36 sinks in the internal control passway 33 of second control channel 29.Different with the control channel mouth of first control channel 28, this internal control passway 33 and non-circular, but be annular design, because it is provided with around the piston rod that passes second next door 6 15 with one heart.

In order between closure member 37 and driven plunger 12, can not produce and the leakage flow of undesirable, closure member 37 in its zone, back side, preferably be provided with axial projection, with respect to the concentric sealing flange 79 of longitudinal axis 44.The sealing flange is especially in the transition region between diapire 42 and sidewall 43.Utilizing under the state that driven plunger 12 clamps of closure member 37, sealing flange 79 press against under the situation of sealing driven plunger 12 towards end face 62 on.Also can alternatively consider to adopt another kind of sealing means.

Sealing 37 advantageously is made up of two interconnective assemblies in material fit ground.An assembly is the support 82 that is made up of rigid material, another assembly be material fit be fixed on the elastomer 83 on the support 82, this elastomer also has sealing lip 45.

Support 82 for example is made up of hard plastics or metal.It is preferably made through deep-draw by steel.It for example has basic moulding for jar shape, and has disc zone 84 that belongs to diapire 42 and the sleeve segment 85 that belongs to carrying section 55.The diapire 42 of Sealing 37 preferably is made up of the disc zone 84 of perforate in the middle of being preferably in separately.Sidewall 43 or carrying section 55 are made up of the hollow section 86 of sleeve segment of support 82 85 and elastomer 83, this hollow section preferably surround fully or the radially outward of parcel sleeve segment 85 towards the periphery.Sealing flange 79 also is the constituent element of the one of elastomer 83 preferably.

Throttling passage 52 had preferably both passed elastomer 83, passed support 82 again.

In the front end area 57 of closure member 37, elastomer 83 have be built into wherein, the sealing lip 45 of oblique outer and projection backwards radially.Foundation zone 46 preferably also is the constituent element of the one of elastomer 83.

Elastomer 83 preferably is molded on the support 82 through injected plastics material ordinatedly.This preferably adopts two component Shooting Techniques to carry out, and wherein before injection moulding process, just is presented to prefabricated support 82 in the injection mould.

Preferred support 82 has the annular brace protruding 87 from sleeve segment 85 radially outward projections in the zone of sealing lip 45.This support protrusion 87 from behind clamping sealing lip 45 with driven plunger 12 axial relative sides, on axial direction particularly, affacting on the sealing lip 45 thus with supporting.In this way, make elastomer 83 because contacting or can not breaking away from support 82 owing to acting compensator or trimmer pressure of the common frictional fit between the wall 78 of sealing lip 45 and

control channel

28,29 provides higher reliability thus.

If next door 5,6 is regional rounded control channel mouth 33, then also can play the effect of the wearing and tearing that reduce sealing lip 45.

Utilize above-mentioned flange particularly also to prevent can not arrive between closure member 37 and the driven plunger 12 at the back pressure or the compensator or trimmer pressure that produce in the working room of attaching troops to a unit during the damping stage 22,23.This is responsible for the very high fatigue strength of closure member 37.

The mobile section that the pressure medium that during the damping stage, can supply flow out uses is preferably only provided by at least one throttling passage 52.Preferably there is not other to be arranged in the throttling passage of for example constructing outside the closure member 37 at the wall of housing 2.Driver element 14 is not preferably passed for the vital throttling passage of terminal damping yet.The straight line driving mechanism 1 that has or do not have terminal damping

device

35,36 can be provided thus, and said straight line driving mechanism structure is identical, and difference only is, installs or do not install at least one closure member 37.

Fig. 1 and 2 is clearly shown that, is equipped with one or two closure member 37 for driver element 14, and the range of housing 2 still is that length dimension just can not change.Said damping measure thereby also obviously be suitable for installing additional existing straight line driving mechanism.So-called short stroke cylinder with relatively little running length especially also can advantageously be equipped with one or two terminal damping

device

35,36.

In closure member 37, preferably be integrated with at least three kinds of functions; The block function of the control channel that promptly in the damping stage, will attach troops to a unit blocking-up, the sealing function of realizing by sealing lip 45; Preferably also have the throttling function that realizes through at least one throttling passage 52, the pressure medium that wherein flows out passes closure member 37.Can produce very little manufacturing and installation cost through design like this.

Claims

1. fluid actuated straight line driving mechanism; Have housing (2) and driver element (14); This driver element can move with respect to this housing straight line through applying fluid; Wherein this driver element (14) has driven plunger (12); It is inner and be divided into two working rooms spaced apart from each other (22,23) there that this driven plunger is arranged on housing (2), and during the damping stage, this driven plunger is braked by the terminal damping device (35) of straight line driving mechanism (1) near first next door (5) relative with driven plunger of housing (2) time; Wherein this terminal damping device (35) has closure member (37); This closure member is arranged on the sealing lip (45) that annular was gone up and had to driver element (14) in the side towards first next door (5) of driven plunger (12), is the control channel mouth (33) on first next door (5) that is arranged on of control channel (28) on the opposite of this closure member, and this control channel is used for carrying out controlled fluid and applying being arranged at first working room (22) between driven plunger (12) and first next door (5); During the damping stage; Closure member (37) can suitably sink in this control channel, makes sealing lip (45) by wall (78) the hermetically mating reaction of sealing surface (48) with control channel (28), and wherein terminal damping device (35) also has at least one throttling passage (52); During the damping stage; Said throttling passage provides the fluid of throttling to be connected between first working room (22) and control channel (28), it is characterized in that at least one throttling passage (52) is constructed in closure member (37); And suitably pass closure member (37); Make that said throttling passage-observation-one side is passed in first working room (22) with first throttle passway (76) in the damping stage, is passed in the control channel (28) with the second throttling passage mouth (77) on the other hand, walk around sealing surface (48) sealing lip (45) and walls control channel (28) (78) mating reaction simultaneously.

2. straight line driving mechanism as claimed in claim 1 is characterized in that, closure member (37) is independent member with respect to driver element (14).

3. according to claim 1 or claim 2 straight line driving mechanism is characterized in that at least one throttling passage (52) has the extending part of walking around whole sealing lip (45) and not passing the sealing lip.

4. like each described straight line driving mechanism in the claim 1 to 3, it is characterized in that closure (37) has the carrying section (55) of carrying sealing lip (45), this carries the section preferred materials and is connected with sealing lip (45) ordinatedly.

5. straight line driving mechanism as claimed in claim 4 is characterized in that, throttling passage (52) only stretches in carrying section (55).

6. like claim 4 or 5 described straight line driving mechanisms, it is characterized in that carrying section (55) is annular design, is preferably telescopic design at this, wherein sealing lip (45) is preferably disposed in the axial end regions of annular carrying section (55).

7. straight line driving mechanism as claimed in claim 6; It is characterized in that; Sealing lip (45) is fixed on foundation zone (46) and carries on the section (55), and wherein two throttling passage mouths (76,77) are arranged on the side towards driven plunger (12) in foundation zone (46).

8. like claim 6 or 7 described straight line driving mechanisms; It is characterized in that; First throttle passway (76) is arranged in the side towards driven plunger (12) of sealing lip (45) on the periphery surface of carrying section (55) of annular, and the second throttling passage mouth (77) be arranged on this carryings section in enclose on the face.

9. like each described straight line driving mechanism in the claim 6 to 8, it is characterized in that at least one throttling passage (52) radially passes the annular solid of the carrying section (55) of annular.

10. like each described straight line driving mechanism in the claim 6 to 9; It is characterized in that; The carrying section (55) of the annular of closure member (37) is surrounded inner chamber (68); This inner chamber is axially deviating from the distolateral opening of driven plunger (12), and the second throttling passage mouth (77) preferably is passed in this inner chamber.

11. like each described straight line driving mechanism in the claim 6 to 10; It is characterized in that; Carrying section (55) spaced radial of annular is turned up the soil and is surrounded the convexity of axially leaving driven plunger (12) projection of driver element (14) coaxially; Making has an annular chamber (75) between the carrying section (55) of annular and this convexity, this annular chamber is communicated with throttling passage (52) enduringly, and during the throttling stage, is connected with the control channel of attaching troops to a unit (28) fluid-tight ground.

12. straight line driving mechanism as claimed in claim 11; It is characterized in that; The convexity that sinks in the closure member (37) of driver element (14) is made up of piston rod (15), perhaps is made up of the fixing device (67) that is used for driven plunger (12) is fixed on the piston rod (15).

13. like each described straight line driving mechanism in the claim 4 to 12; It is characterized in that; The carrying section (55) of closure member (37) is the constituent element of blocking-up and fixed body (54); This blocking-up and fixed body are used for being fixed on driver element (14) to closure member (37), and are used for during the damping stage, blocking control channel (28).

14. straight line driving mechanism as claimed in claim 13; It is characterized in that; Blocking-up be an annular design with fixed body (54), and preferably has holding part (56) and carrying section (55), and this holding part is a dish type and in middle perforate; And be used for fixing on driver element (4), this carries the Duan Zaiyi side and is connected with holding part coaxially.

15. like each described straight line driving mechanism in the claim 1 to 14; It is characterized in that; Closure member (37) is a jar shape design; And have the diapire (42) and the sidewall (43) telescopic design, that carrying sealing lip (45) of best perforate, wherein in order to form at least one throttling passage (52), sidewall (43) is by partial penetration.

16. like each described straight line driving mechanism in the claim 1 to 15; It is characterized in that; Closure member (37) has the support (82) that is made up of rigid material, on this support, forms to material fit sealing lip (45), and preferred materials forms the elastomer (83) of band sealing lip (45) ordinatedly; Wherein support (82) preferably has support protrusion (87), supports ground in the axial foundation of clamping sealing lip (45) zone (46) from behind in support protrusion.

17. like each described straight line driving mechanism in the claim 1 to 16; It is characterized in that; It has two terminal damping devices (35,36); These two terminal damping devices are arranged on the opposite sides to each other of driven plunger (12), and a closure member (37) with one of two control channels (28,29) mating reaction is respectively arranged, and work on one of two possible axial motion directions of each comfortable driver element (14).