CN102155468B - Hydraulic cylinder and cushioning device of hydraulic cylinder - Google Patents
Hydraulic cylinder and cushioning device of hydraulic cylinder Download PDFInfo
- Publication number
- CN102155468B CN102155468B CN 201110107413 CN201110107413A CN102155468B CN 102155468 B CN102155468 B CN 102155468B CN 201110107413 CN201110107413 CN 201110107413 CN 201110107413 A CN201110107413 A CN 201110107413A CN 102155468 B CN102155468 B CN 102155468B
- Authority
- CN
- China
- Prior art keywords
- cushion collar
- throttling
- cushion
- cylinder
- piston
- 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.)
- Expired - Fee Related
Links
Images
Abstract
The invention discloses a hydraulic cylinder and a cushioning device of the hydraulic cylinder. The cushioning device comprises a cushioning sleeve, a spring and an outer cushioning component, wherein a central hole is formed on the cushioning sleeve; the outer cushioning component is fixed with a cylinder body; a throttling oil passage is formed between an outer wall face of the cushioning sleeve and an inner wall face of the outer cushioning component; the cushioning sleeve and the outer cushioning component are in sliding fit in axial direction; the spring is positioned between the cylinder body and the cushioning sleeve; in a free state, an inner end of the cushioning sleeve extends into a hydraulic chamber of the hydraulic cylinder; and an inner end face of the cushioning sleeve can be in sealing fit with a cushioning blocking face of a piston. By the cushioning device provided by the invention, the fit of the outer wall face of the cushioning sleeve and the inner wall face of a guide sleeve is not required, and the phenomenon of blocking of the cushioning sleeve caused by displacement of the cushioning sleeve cannot be generated, so that damage to a fitting face of the cushioning sleeve and the outer cushioning component can be reduced or avoided, and the reliability and cushioning effect of the cushioning device are guaranteed.
Description
Technical field
The present invention relates to a kind of buffer technology of oil hydraulic cylinder, particularly the hydraulic pressure cylinder cushion also relates to the oil hydraulic cylinder that comprises this hydraulic pressure installation.
Background technique
Oil hydraulic cylinder is widely used hydraulic unit in the engineering machinery; The elemental motion of oil hydraulic cylinder is that piston is with respect to the fore and aft motion of cylinder body; In the course of the work, with respect to cylinder body, piston constantly moves back and forth.When piston rod stretched out or be withdrawn into limit position, piston end face can produce very big impact to the cylinder body two ends; This kind impact not only can cause the damage of oil hydraulic cylinder, shortens the working life of oil hydraulic cylinder, also can influence the operating characteristics of engineering machinery.For this reason, operated by rotary motion can absorb the damping device that piston impacts cylinder body in the oil hydraulic cylinder, to reduce the percussion of piston, reduces the damage of oil hydraulic cylinder, prolongs the working life of oil hydraulic cylinder.
Current, along with the development of engineering machine machinery, the hydraulic pressure cylinder cushion generally adopts the hydraulic throttle mode that piston is cushioned.Damping device generally comprises cushion collar and the guide sleeve that matches; Cushion collar links to each other with the piston rod of piston, and moves with piston; Guide sleeve with link to each other to cylinder body, guarantee the leading role to the piston rod of piston simultaneously.When piston arrives was stretched out limit position or withdrawal limit position, the outer wall of cushion collar and the internal face of guide sleeve matched, and form predetermined throttling oil duct; Hydraulic oil refluxes by the throttling oil duct, makes hydraulic fluid pressure increase in the corresponding hydraulic pressure cavity, and then the movement velocity of piston is reduced, and absorbs the impact that piston produces.Chinese patent literature CN201420722Y and CN201296938Y just disclose a kind of oil hydraulic cylinder with damping device respectively, and the damping device in this oil hydraulic cylinder is exactly to utilize the throttling action between cushion collar and the guide sleeve to realize buffering.
Utilize when having damping device now, the prerequisite that damper piston impacts is to guarantee the outer wall of cushion collar and the cooperation of guide sleeve internal face; The fit dimension precision of the outer wall of cushion collar and the internal face of guide sleeve and quality of processing directly have influence on the cooperation between the internal face of the outer wall of cushion collar and guide sleeve; This cooperation is easy to cause pulling of fitting surface, and then not only reduces the cushioning effect of damping device, also can cause the damage of damping device when serious; Therefore, the reliability of existing damping device can not satisfy actual demand.
Summary of the invention
Therefore, the objective of the invention is to, a kind of hydraulic pressure cylinder cushion is provided, this damping device has higher reliability.
Providing on the basis of above-mentioned damping device, a kind of oil hydraulic cylinder that comprises above-mentioned damping device also is provided.
Hydraulic pressure cylinder cushion provided by the invention comprises the cushion collar with center hole; Also comprise spring and the outer buffer unit of fixing with cylinder body; Form the throttling oil duct between the internal face of described cushion collar outer wall and described outer buffer unit, and the two is slidingly matched in the axial direction; Described spring is between cylinder body and cushion collar; Under free state, under described spring action, the inner of described cushion collar is stretched in the hydraulic pressure cavity of oil hydraulic cylinder; In buffering course, the buffering stop block face of the interior edge face of described cushion collar and piston is sealed and matched;
Described outer buffer unit is the buffering baffle ring fixing with cylinder body;
Described throttling oil duct comprises and is positioned at throttling groove described cushion collar outer wall, spill; The bearing of trend of described throttling groove is parallel with axial direction, perhaps forms sharp angle between the two; Described throttling groove two ends in the axial direction the distance greater than the distance between the described buffering baffle ring both ends of the surface.
Optionally, the outer end of described throttling groove extends to the exterior edge face of described cushion collar; The passage section of the inner of described throttling groove is less than the passage section of its outer end.
Optionally, the inner edge of the outer wall of the inner of described throttling groove and described cushion collar has intended distance.
Optionally, the outer wall of described cushion collar has radially-protruding shoulder block; Under free state, under described spring action, described shoulder block interior edge face is inconsistent with the exterior edge face of buffering baffle ring.
Another hydraulic pressure cylinder cushion provided by the invention comprises the cushion collar with center hole; Also comprise spring and the outer buffer unit of fixing with cylinder body; Form the throttling oil duct between the internal face of described cushion collar outer wall and described outer buffer unit, and the two is slidingly matched in the axial direction; Described spring is between cylinder body and cushion collar; Under free state, under described spring action, the inner of described cushion collar is stretched in the hydraulic pressure cavity of oil hydraulic cylinder; In buffering course, the buffering stop block face of the interior edge face of described cushion collar and piston is sealed and matched; Described outer buffer unit is outer cushion collar; The outer wall of described cushion collar forms radially-protruding throttling baffle ring; Form the throttling oil duct between the outer ring surface of described throttling baffle ring and the internal face of described outer cushion collar.
Optionally, described throttling oil duct comprises and is positioned at throttling groove described outer cushion collar internal face, spill; The bearing of trend of described throttling groove is parallel with axial direction, perhaps forms sharp angle between the two; Described throttling groove two ends in the axial direction the distance greater than the distance between the described throttling baffle ring both ends of the surface.
Optionally, the inner of described throttling groove extends to the interior edge face of described outer cushion collar; The passage section of the inner of described throttling groove is greater than the passage section of its outer end.
Optionally, described hydraulic pressure cylinder cushion also comprises outer guide element and interior guide element; Described outer guide element and described cylinder body are fixed, and the outer end of described interior guide element and described cushion collar is fixed; Guide element and described outer guide element are slidingly matched in the axial direction in described.
Optionally, the interior edge face of described cushion collar is provided with the oil groove of crossing that opening is all arranged at the outer wall of cushion collar and internal face.
Oil hydraulic cylinder provided by the invention comprises cylinder body and piston, and described cylinder body comprises cylinder barrel and with guide sleeve and the cylinder bottom head of cylinder barrel closed at both ends, described piston comprises piston rod and piston body; Described piston rod is inner to be fixed with piston body, and it is protruding that the pilot hole of guide sleeve is passed in the outer end; Described piston body is divided into rod chamber and rodless cavity with the inner chamber of cylinder body; Also comprise above-mentioned any described damping device; Described damping device is arranged in described rod chamber; Described piston rod passes the center hole of described cushion collar, forms oily passage between the outer circumferential face of described piston rod and the cushion collar internal face; Described rod chamber communicates with the external world by the turnover oilhole of the oily passage of described mistake and described guide sleeve; Or/and; Described damping device is arranged in described rodless cavity; Described rodless cavity communicates with the external world by the center hole of described cushion collar and the turnover oilhole of described cylinder bottom head.
Compared with prior art, hydraulic pressure cylinder cushion provided by the invention comprises cushion collar, in addition, also comprises spring and the outer buffer unit of fixing with cylinder body; The outer wall of described cushion collar and the internal face of described outer buffer unit are slidingly matched in the axial direction, and form the throttling oil duct between the two fitting surface; Spring applies predetermined force to cushion collar between cylinder body and cushion collar, under free state, make described cushion collar have the trend that moves inward, and makes the inner of cushion collar can stretch into rodless cavity or the rod chamber of oil hydraulic cylinder; In buffering course, the buffering stop block face of the interior edge face of described cushion collar and piston is sealed and matched, and the hydraulic oil in the corresponding hydraulic pressure cavity is refluxed by the throttling oil duct between cushion collar and the outer buffer unit, realizes the buffering to oil hydraulic cylinder.Compared with prior art, utilize damping device provided by the invention, in buffering course, do not need the outer wall of cushion collar to match with the internal face of guide sleeve, and then can not produce owing to the cushion collar dislocation produces the stuck phenomenon of cushion collar; Simultaneously, in buffering course, it is very little that cushion collar is subjected to radial effect power, and then can reduce or avoid pulling of fitting surface between cushion collar and the outer buffer unit, guarantees reliability and the buffering effect of damping device; In addition, the structure that is sealed and matched of the buffering stop block face of the end face of cushion collar and piston guarantees the quality of fit of sealing fitting surface easily, guarantees the sealing to the cushion collar center hole, cuts off main oil circuit passage better, guarantees cushioning effect; Simultaneously, the buffering stop block face easy processing of the end face of cushion collar and piston, and then can reduce difficulty of processing and the processing cost of damping device.
In further technological scheme, described outer buffer unit is the buffering baffle ring fixing with cylinder body.The buffering baffle ring is matched with cushion collar, not only can guarantee the quality of fit of the two, make things convenient for cushion collar and the processing that cushions baffle ring, also help assembling and the maintenance of damping device.
In further technological scheme, the outer wall of described cushion collar forms the throttling groove of spill, and makes the bearing of trend of throttling groove parallel with axial direction, perhaps forms sharp angle between the two.Throttling oil duct in this technological scheme is at least part of to be formed by throttling groove; Like this, the precision that the throttling action of throttling oil duct just no longer only depends on fitting surface between cushion collar and the buffering baffle ring realizes that the shape that can also depend on throttling groove realizes; This just can reduce the difficulty of processing of damping device significantly, improves the work efficiency of damping device, reduces the cost of production of damping device.
In further technological scheme, the outer end of described throttling groove extends to the exterior edge face of described cushion collar, and the passage section of described throttling groove the inner is less than the passage section of its outer end.The damping device that utilizes this technological scheme to provide, when the buffering beginning, the passage section of throttling oil duct is bigger; Process along with buffering, the passage section of throttling oil duct reduces gradually, and the cushion effect that damping device is produced increases gradually, when avoiding the buffering beginning, the pressure of the hydraulic pressure cavity at damping device place increases suddenly, reduces to cushion instantaneous hydraulic oil instantaneous pressure.
In further technological scheme, the inner of the throttling groove on the described cushion collar outer wall is positioned at outside the inner edge of this outer wall, and namely the inner edge of the outer wall of the inner of described throttling groove and described cushion collar has predetermined distance.The damping device that utilizes this technological scheme to provide finishes at buffering course, when piston arrives is stretched out limit position or withdrawal limit position, can make the passage section of throttling oil duct be reduced to minimum, and then can guarantee cushioning effect, improves the reliability of damping device.
In further technological scheme, the outer end of the outer wall of described cushion collar is provided with radially-protruding shoulder block; Under free state, under described spring action, described shoulder block interior edge face is inconsistent with the exterior edge face of buffering baffle ring.In this technological scheme, shoulder block can guarantee the accurate location of cushion collar, avoids cushion collar to move inward apart from excessive, improves the reliability of damping device.
In further optional technological scheme, described outer buffer unit is outer cushion collar; The outer wall of described cushion collar forms radially-protruding throttling baffle ring; The outer ring surface of described throttling baffle ring and the internal face of described outer cushion collar are slidingly matched in the axial direction, and form the throttling oil duct between the two fitting surface.This technological scheme equally also can realize purpose of the present invention.
In further technological scheme, also comprise outer guide element and interior guide element; Described outer guide element and described cylinder body are fixed, and described interior guide element and described cushion collar outer end are fixed; Guide element and described outer guide element are slidingly matched in the axial direction in described.May guarantee being slidingly matched between cushion collar and the outer cushion collar like this, improve the reliability of damping device.
On providing, on the basis of this hydraulic pressure cylinder cushion, also provide a kind of oil hydraulic cylinder that comprises above-mentioned damping device, because damping device has above-mentioned technique effect, comprise that the oil hydraulic cylinder of above-mentioned damping device also has corresponding technique effect.
Description of drawings
Fig. 1 is the part-structure schematic representation of the oil hydraulic cylinder that provides of the embodiment of the invention one, and damping device shown in the figure is arranged in the structure of the rodless cavity of oil hydraulic cylinder;
Fig. 2 is in the hydraulic pressure cylinder cushion that provides of the embodiment of the invention one, the structural representation of cushion collar;
Fig. 3 is in the oil hydraulic cylinder that provides of the embodiment of the invention one, the structural representation of the damping device of rodless cavity when buffering course begins;
Fig. 4 is in the oil hydraulic cylinder that provides of the embodiment of the invention one, the structural representation of the damping device of rodless cavity when buffering course finishes;
Fig. 5 is the part-structure schematic representation of the oil hydraulic cylinder that provides of the embodiment of the invention two, and damping device shown in the figure is arranged in the structure of the rodless cavity of oil hydraulic cylinder;
Fig. 6 is the damping device structure diagram of another kind of structure provided by the invention.
Embodiment
Partly describe as background technique, based on the problem that prior art exists, the claimant analyzes the reason that causes this problem.Cushion collar and guide sleeve produce the reason of pulling and are that quality of fit and fit quality between cushion collar outer wall and the guide sleeve internal face are lower; And the factor that the outer wall of restriction cushion collar and the quality of fit between the guide sleeve internal face and fit quality improve is except level of processing and process equipment, the more important thing is because in buffering course, cushion collar moves with piston and mobile, in mobile, cushion collar can produce deviation in the radial direction of oil hydraulic cylinder, and then mismatch error increase between the internal face of the outer wall that makes cushion collar and guide sleeve.For this reason, the claimant has proposed to make cushion collar and piston to keep separating, and makes cushion collar and outer buffer unit keep the technological scheme that is slidingly matched, and on this basis damping device is improved.
Describe the present invention below in conjunction with accompanying drawing, the description of this part only is exemplary and explanatory, should any restriction not arranged to protection scope of the present invention.In order to describe the convenience of working principle and technique effect, in this part, when oil hydraulic cylinder provided by the invention is described, the hydraulic pressure cylinder cushion is described; No longer damping device provided by the invention is described separately.
In this part, the nouns of locality such as described " interior ", " outward ", all with for the piston body of oil hydraulic cylinder, near the position of piston body be in, relative, away from the position of piston body be outside.Described is the moving direction of the piston of oil hydraulic cylinder axially.
Please refer to Fig. 1 and Fig. 2, Fig. 1 is the part-structure schematic representation of the oil hydraulic cylinder that provides of the embodiment of the invention one, and damping device shown in the figure is arranged in the structure of the rodless cavity of oil hydraulic cylinder; Fig. 2 is in the hydraulic pressure cylinder cushion that provides of the embodiment of the invention one, the structural representation of cushion collar.
The oil hydraulic cylinder that the embodiment of the invention provides comprises cylinder body and piston; Cylinder body comprises cylinder barrel 120 again and with guide sleeve and the cylinder bottom head 130 of cylinder barrel 120 closed at both ends; Piston comprises piston rod and piston body 220.Piston body 220 cooperates with cylinder barrel 120 internal face slipper seals, and the inner chamber of cylinder body is divided into rod chamber and rodless cavity.Cylinder bottom head 130 is provided with the turnover oilhole, and rodless cavity communicates with the hydraulic circuit in the external world by the turnover oilhole of cylinder bottom head 130.This oil hydraulic cylinder also comprises the damping device that is arranged in rodless cavity.
Please refer to Fig. 1, the damping device in the rodless cavity comprises cushion collar 410, buffering baffle ring 420 and spring 430.Buffering baffle ring 420 is fixing by jump ring and cylinder bottom head 130.Cushion collar 410 has the center hole that connects both ends of the surface; The outer wall of cushion collar 410 is slidingly matched in the axial direction with the internal face of buffering baffle ring 420, and has predetermined gap between the two fitting surface, forms the throttling oil duct.Spring 430 1 ends are supported on cylinder bottom head 130 interior edge faces, and the other end is supported on the inner boss of center hole of cushion collar 410, makes cushion collar 410 have the trend that moves inward; Under free state, under spring 430 effects, the inner of cushion collar 410 is stretched in the rodless cavity of oil hydraulic cylinder; The piston rod end face of piston forms buffering stop block face 222, and the interior edge face of cushion collar 410 is corresponding with buffering stop block face 222; When the interior edge face of cushion collar 410 and buffering stop block face 222 were inconsistent, the two can keep being sealed and matched, and made between the center hole of cushion collar 410 and the rodless cavity to keep isolating.
Be appreciated that the position according to cushion collar 410 the inners, buffering stop block face 222 can be arranged on the piston body 220 of piston or the relevant position of piston rod.In addition, spring 430 two ends are not limited to be supported on the inner boss of cylinder bottom head 130 and center hole; According to actual needs, spring 430 can be arranged between cylinder body and cushion collar 410, and make cushion collar 410 keep the trend that moves inward by pressure or pulling force.
The working principle of above-mentioned damping device is as follows:
When piston-retraction, piston body 220 moves to cylinder bottom head 130, and the hydraulic oil in the rodless cavity refluxes by the center hole of cushion collar 410 and the oil inlet and outlet of cylinder bottom head 130.When the piston arrives precalculated position, when approaching the withdrawal limit position, damping device begins to play a role, and buffering course begins, and damping device begins to cushion.
Please refer to 3, this figure is in the oil hydraulic cylinder that provides of the embodiment of the invention one, the structural representation of the damping device of rodless cavity when buffering course begins.When buffering stop block face 222 and the interior edge face of cushion collar 410 were inconsistent, because the effect of spring 430, the interior edge face that makes cushion collar 410 and buffering stop block face 222 kept the predetermined pressure that contacts, and made between the center hole of cushion collar 410 and the rodless cavity to keep sealing.At this moment, the hydraulic oil in the rodless cavity is by the throttling oil duct backflow between the internal face of the outer wall of cushion collar 410 and buffering baffle ring 420.The throttling oil duct produces throttling action, and the oil return flow of hydraulic oil is reduced, and has increased the backflow resistance of hydraulic oil, and the hydraulic fluid pressure of rodless cavity is increased, and produces buffer function, and piston-retraction speed is reduced, and realizes the buffering to oil hydraulic cylinder.
Please refer to Fig. 4, this figure is in the oil hydraulic cylinder that provides of the embodiment of the invention one, the structural representation of the damping device of rodless cavity when buffering course finishes.When piston body 220 arrives predetermined withdrawal limit position, piston end surface and cylinder bottom head 130 inner inconsistent, piston stops movement.
Utilize above-mentioned damping device, cushion collar 410 no longer moves with piston and mobile; When buffering course began, the buffering stop block face 222 of the interior edge face of cushion collar 410 and piston was inconsistent, and formation is sealed and matched.Compared with prior art, in buffering course, do not need the outer wall of cushion collar 410 to cooperate with the internal face of guide sleeve (or miscellaneous part), and then can not produce owing to cushion collar 410 dislocation produces the stuck phenomenon of cushion collar 410; Simultaneously, in buffering course, it is very little that cushion collar 410 is subjected to radial effect power, and then can reduce or avoid the pulling of fitting surface between cushion collar 410 and the buffering baffle ring 420, guarantees reliability and the buffering effect of damping device.In addition, cooperate the quality of fit that guarantees the sealing fitting surface easily between the buffering stop block face 222 of cushion collar 410 end faces and piston, and then guarantee the sealing to cushion collar 410 center holes easily; This not only can guarantee cushioning effect, can also reduce difficulty of processing and the processing cost of damping device further.
Please in conjunction with Fig. 1 and Fig. 2.In this example, also be provided with the throttling groove 401 that extends in the axial direction in the outer wall of cushion collar 410, this throttling groove 401 is spill, inwardly concaves from the outer wall of cushion collar 410.In buffering course, throttling groove 401 forms at least a portion of throttling oil duct, and the hydraulic oil in the rodless cavity can reflux by throttling groove 401.In this damping device, the precision that the throttling action of throttling oil duct just no longer only depends on fitting surface between cushion collar 410 and the buffering baffle ring 420 realizes that the shape that can also depend on throttling groove 401 realizes.It will be understood by those skilled in the art that with machining accuracy by improving fitting surface between cushion collar 410 and the buffering baffle ring 420 and fit quality to guarantee that restriction effect compares, reach predetermined restriction effect by the shape and size precision that improves throttling groove 401 is easier; And then this just can reduce the difficulty of processing of damping device, improves the work efficiency of damping device, reduces the cost of production of damping device.
Refer again to Fig. 2, in this example, the outer end of throttling groove 401 extends to the outer wall of cushion collar 410, and the degree of depth of throttling groove 401 the inners makes the passage section of throttling groove 401 the inners less than the passage section of its outer end less than the degree of depth of its outer end.When utilizing the throttling groove 401 of this structure, when buffering course began, the passage section of throttling oil duct was bigger; Along with the process of buffering, buffering baffle ring 420 internal faces can block the bigger part of a throttling groove 401 outer end degree of depth, make hydraulic oil in the rodless cavity by the less partial reflux of throttling groove 401 degree of depth away from the outer end; The passage section of throttling oil duct is reduced gradually, and the cushion effect that damping device is produced increases gradually; And then can avoid buffering beginning moment, hydraulic fluid pressure increases suddenly and impacts in the rodless cavity.
In addition, for fear of the hydraulic oil by cushion collar 410 center holes reduces suddenly in buffering beginning moment, be provided with what the outer wall of cushion collar 410 and internal face all had an opening at the interior edge face of cushion collar 410 and cross oil groove 413; When the buffering beginning, cushion collar 410 interior edge faces and buffering stop block face 222 are sealed and matched moment, hydraulic oil in the rodless cavity can also so just can make the hydraulic fluid pressure in the rodless cavity reduce gradually from crossing the center hole that oil groove 413 enters cushion collar 410, guarantees the stability of hydraulic cylinder works.In addition, the cross section of oil groove 413 and area of contour in the axial direction suitably were set, in the scheduled time of buffering beginning, can also make in the rodless cavity hydraulic oil cross 413 pairs of cushion collar 410 the inners of oil groove by this and apply certain active force, making can be in instantaneous sealing between cushion collar 410 interior edge faces and the buffering stop block face 222, but along with cushion collar 410 is outwards mobile, the active force of spring 430 overcomes the active force that hydraulic oil passed through 413 pairs of cushion collars 410 of oil groove, makes cushion collar 410 interior edge faces and buffering stop block face 222 keep being sealed and matched again; So just can make the process that is sealed with between cushion collar 410 interior edge faces and the buffering stop block face 222; This process can make the hydraulic oil by center hole reduce gradually, and then avoids in the rodless cavity hydraulic fluid pressure to increase suddenly and impact.Stressed evenly in order to guarantee cushion collar 410, a plurality of oil grooves 413 of crossing of even layout can be set at cushion collar 410 interior edge faces.
In addition, in this example, the inner of throttling groove 401 is positioned at outside the inner edge of cushion collar 410 outer wall, and namely the inner of throttling groove 401 does not extend to the inner edge of cushion collar 410 outer wall, has intended distance between the two; Like this, finish at buffering course, during piston arrives withdrawal limit position, can make the passage section of throttling oil duct reach minimum, and then can guarantee cushioning effect, improve the reliability of damping device.
According to foregoing description, be appreciated that, the outer end that makes throttling groove 401 has different passage sections with its inner and is not limited to realize by the degree of depth that changes throttling groove 401, also can realize by the width that changes throttling groove 401, can also realize by changing throttling groove 401 sectional shapes.The bearing of trend of first segment groove 401 is not limited to parallel with axial direction, also can be the direction that forms sharp angle between other and the axial direction; As long as have corresponding extended length at axial direction, just can realize the throttling purpose.According to actual needs, a plurality of throttling grooves 401 can be set in the outer wall of cushion collar 410, a plurality of throttling grooves 401 are evenly distributed on the outer wall of cushion collar 410.
Please refer to Fig. 1 and Fig. 2, in this example, the close outer end portion of the outer wall of cushion collar 410 is provided with radially-protruding shoulder block 412; Under free state, under spring 430 effects, shoulder block 412 interior edge faces are inconsistent with the exterior edge face of buffering baffle ring 420.In this technological scheme, the accurate location that shoulder block 412 can guarantee cushion collar 410 is set, the distance that restriction cushion collar 410 moves inward prevents that cushion collar 410 from separating with buffering baffle ring 420, improves the reliability of damping device.Certainly, the particular location of shoulder block 412 can be determined according to buffering elapsed time and cushion collar 410 length and actual buffering needs.
Above-mentioned damping device is not limited to the rodless cavity for oil hydraulic cylinder, also can be applied in the rod chamber of oil hydraulic cylinder.Please refer to Fig. 5, this figure and be the part-structure schematic representation of the oil hydraulic cylinder that the embodiment of the invention two provides, damping device shown in the figure is arranged in the structure of the rodless cavity of oil hydraulic cylinder.
Provide oil hydraulic cylinder to comprise cylinder barrel 120 and the guide sleeve 110 that cylinder barrel 120 1 ends are sealed, piston comprises piston rod 210 and piston body 220; Piston rod 210 is inner fixing with piston body 220, and it is protruding that the pilot hole of guide sleeve 110 is passed in the outer end; Piston body 220 is divided into rod chamber and rodless cavity with the inner chamber of cylinder body.Damping device in this oil hydraulic cylinder is arranged in rod chamber, and this damping device is identical with embodiment's one hydraulic pressure cylinder cushion structure; Because this damping device is arranged in rod chamber, cushion collar 410 center holes have suitable internal diameter, it is protruding to make the piston rod 210 of oil hydraulic cylinder can pass the center hole of cushion collar 410, and forms the oily passage of mistake with suitable passage section between the internal face of the outer circumferential face of piston rod 210 and cushion collar 410 center holes; Rod chamber communicates with the external world by this turnover oilhole of crossing oily passage and guide sleeve 110; Piston rod 210 forms the buffering stop block face 222 corresponding with cushion collar 410 the inners.The working principle of this damping device is identical with a kind of damping device of embodiment, does not repeat them here.
According to foregoing description, cushion collar 410 is not limited to and cushions baffle ring 420 and is slidingly matched, other outer buffer units also can be set, cushion collar 410 outer wall and the internal face that is somebody's turn to do outer buffer unit be slidingly matched in the axial direction, and form predetermined throttling oil duct between the two fitting surface; And make spring 430 between cylinder body and cushion collar 410; Under free state, under spring 430 effects, the inner of cushion collar 410 is stretched in the hydraulic pressure cavity of oil hydraulic cylinder; In buffering course, the interior edge face of cushion collar 410 can be sealed and matched with the buffering stop block face 222 of piston, just can realize purpose of the present invention.Outer buffer unit can be fixed with cylinder body, also can be integrally formed with cylinder barrel, cylinder bottom head 130 or the guide sleeve of cylinder body; Outer buffer unit is not limited to above-mentioned buffering baffle ring 420, can also have structure for other; Such as: can be sleeve-like configuration.
Please refer to Fig. 6, this figure is the damping device structure diagram of another kind of structure provided by the invention.This damping device comprises cushion collar 410, spring 430 and outer buffer unit; In this example, outer buffer unit is the outer cushion collar 440 fixing with cylinder body (this is not shown); The outer wall of cushion collar 410 forms radially-protruding throttling baffle ring 414; Cushion collar 410 outer wall are slidingly matched in the axial direction with the internal face of outer buffer unit, specifically are, the outer ring surface of throttling baffle ring 414 is slidingly matched in the axial direction with the internal face of outer cushion collar 440, and forms the throttling oil duct between the two fitting surface.Keep cooperating by throttling baffle ring 414 and outer cushion collar 440 internal faces, can make things convenient for the processing of fitting surface, reduce the processing cost of damping device.
Under the prerequisite with above-mentioned throttling baffle ring 414, among this embodiment, the internal face of outer cushion collar 440 also has the throttling groove 401 of spill; The bearing of trend of throttling groove 401 is parallel with axial direction, perhaps forms sharp angle between the two; These throttling groove 401 two ends in the axial direction the distance greater than the distance between described throttling baffle ring 414 both ends of the surface; In the optimal technical scheme, make the inner of throttling groove 401 extend to the interior edge face of outer cushion collar 440, and the passage section of the inner that makes throttling groove 401 is greater than the passage section of its outer end.Throttling groove 401 among the function of this throttling groove 401 and the embodiment one in the damping device is basic identical, does not repeat them here.
In the optimal technical scheme, for the reliability that throttling baffle ring 414 outer ring surfaces that guarantee cushion collar 410 cooperate with outer cushion collar internal face, damping device can also comprise outer guide element and interior guide element; And outer guide element and cylinder body are fixed, guide element and cushion collar 410 outer ends are fixed in making; Guide element is slidingly matched in the axial direction with outer guide element in making again; Interior guide element is slidingly matched as auxiliary with outer guide element, can improve the reliability that throttling baffle ring 414 outer ring surfaces cooperate with outer cushion collar 440 internal faces.Certainly, also can be arranged on the outer wall of cushion collar 410 and the oil groove of crossing that internal face all has opening at the interior edge face of cushion collar 410.
The above only is preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (10)
1. a hydraulic pressure cylinder cushion comprises the cushion collar (410) with center hole; It is characterized in that, also comprise spring (430) and the outer buffer unit of fixing with cylinder body; Form the throttling oil duct between the internal face of described cushion collar (410) outer wall and described outer buffer unit, and the two is slidingly matched in the axial direction; Described spring (430) is positioned between cylinder body and the cushion collar (410); Under free state, under described spring (430) effect, the inner of described cushion collar (410) is stretched in the hydraulic pressure cavity of oil hydraulic cylinder; In buffering course, the buffering stop block face (222) of the interior edge face of described cushion collar (410) and piston is sealed and matched;
Described outer buffer unit is the buffering baffle ring (420) fixing with cylinder body;
Described throttling oil duct comprises and is positioned at described cushion collar (410) throttling groove outer wall, spill (401); The bearing of trend of described throttling groove (401) is parallel with axial direction, perhaps forms sharp angle between the two; Described throttling groove (401) two ends in the axial direction the distance greater than the distance between described buffering baffle ring (420) both ends of the surface.
2. hydraulic pressure cylinder cushion according to claim 1 is characterized in that, the outer end of described throttling groove (401) extends to the exterior edge face of described cushion collar (410); The passage section of the inner of described throttling groove (401) is less than the passage section of its outer end.
3. hydraulic pressure cylinder cushion according to claim 2 is characterized in that, the inner edge of the outer wall of the inner of described throttling groove (401) and described cushion collar (410) has intended distance.
4. according to each described hydraulic pressure cylinder cushion of claim 1-3, it is characterized in that the outer wall of described cushion collar (410) has radially-protruding shoulder block (412); Under free state, under described spring (430) effect, described shoulder block (412) interior edge face is inconsistent with the exterior edge face of buffering baffle ring (420).
5. a hydraulic pressure cylinder cushion comprises the cushion collar (410) with center hole; It is characterized in that, also comprise spring (430) and the outer buffer unit of fixing with cylinder body; Form the throttling oil duct between the internal face of described cushion collar (410) outer wall and described outer buffer unit, and the two is slidingly matched in the axial direction; Described spring (430) is positioned between cylinder body and the cushion collar (410); Under free state, under described spring (430) effect, the inner of described cushion collar (410) is stretched in the hydraulic pressure cavity of oil hydraulic cylinder; In buffering course, the buffering stop block face (222) of the interior edge face of described cushion collar (410) and piston is sealed and matched; Described outer buffer unit is outer cushion collar (440); The outer wall of described cushion collar (410) forms radially-protruding throttling baffle ring (414); Form the throttling oil duct between the internal face of the outer ring surface of described throttling baffle ring (414) and described outer cushion collar (440).
6. hydraulic pressure cylinder cushion according to claim 5 is characterized in that, described throttling oil duct comprises and is positioned at described outer cushion collar (440) throttling groove internal face, spill (401); The bearing of trend of described throttling groove (401) is parallel with axial direction, perhaps forms sharp angle between the two; Described throttling groove (401) two ends in the axial direction the distance greater than the distance between described throttling baffle ring (414) both ends of the surface.
7. hydraulic pressure cylinder cushion according to claim 6 is characterized in that, the inner of described throttling groove (401) extends to the interior edge face of described outer cushion collar (440); The passage section of the inner of described throttling groove (401) is greater than the passage section of its outer end.
8. hydraulic pressure cylinder cushion according to claim 5 is characterized in that, also comprises outer guide element and interior guide element; Described outer guide element and described cylinder body are fixed, and the outer end of described interior guide element and described cushion collar (410) is fixed; Guide element and described outer guide element are slidingly matched in the axial direction in described.
9. according to each described hydraulic pressure cylinder cushion among claim 1-3, the 5-8, it is characterized in that the interior edge face of described cushion collar (410) is provided with what the outer wall of cushion collar (410) and internal face all had an opening and crosses oil groove (413).
10. an oil hydraulic cylinder comprises cylinder body and piston, and described cylinder body comprises cylinder barrel (120) and with guide sleeve (110) and the cylinder bottom head (130) of cylinder barrel (120) closed at both ends, described piston comprises piston rod (210) and piston body (220); Described piston rod (210) is inner fixing with piston body (220), and it is protruding that the pilot hole of guide sleeve (110) is passed in the outer end; Described piston body (220) is divided into rod chamber and rodless cavity with the inner chamber of cylinder body; It is characterized in that, also comprise each described damping device of claim 1-9;
Described damping device is arranged in described rod chamber; Described piston rod (210) passes the center hole of described cushion collar (410), forms oily passage between the outer circumferential face of described piston rod (210) and cushion collar (410) internal face; Described rod chamber communicates with the external world by the turnover oilhole of the oily passage of described mistake and described guide sleeve (110);
Or/and;
Described damping device is arranged in described rodless cavity; Described rodless cavity communicates with the external world by the center hole of described cushion collar (410) and the turnover oilhole of described cylinder bottom head (130).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110107413 CN102155468B (en) | 2011-04-27 | 2011-04-27 | Hydraulic cylinder and cushioning device of hydraulic cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110107413 CN102155468B (en) | 2011-04-27 | 2011-04-27 | Hydraulic cylinder and cushioning device of hydraulic cylinder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102155468A CN102155468A (en) | 2011-08-17 |
| CN102155468B true CN102155468B (en) | 2013-07-03 |
Family
ID=44437091
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201110107413 Expired - Fee Related CN102155468B (en) | 2011-04-27 | 2011-04-27 | Hydraulic cylinder and cushioning device of hydraulic cylinder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102155468B (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104747536B (en) * | 2015-03-05 | 2017-10-31 | 乌本纳数控设备(上海)有限公司 | Non-locating formula hydraulic throttle buffer gear |
| CN106151160B (en) * | 2015-04-28 | 2018-05-01 | 徐工集团工程机械股份有限公司 | Hydraulic cylinder and excavator with pooling feature |
| CN105179361B (en) * | 2015-09-01 | 2017-11-24 | 徐州重型机械有限公司 | A kind of hydraulic cushion oil cylinder and crane |
| TWI697626B (en) * | 2019-04-15 | 2020-07-01 | 油順精密股份有限公司 | A hydraulic cylinder with a buffer rear cover |
| CN110566534B (en) * | 2019-07-31 | 2021-07-09 | 武汉船用机械有限责任公司 | Damping device |
| CN111022550B (en) * | 2019-12-17 | 2021-09-21 | 徐州徐工液压件有限公司 | Independent hydro-pneumatic suspension with detection device |
| CN112943738B (en) * | 2021-02-04 | 2023-05-12 | 山东华液液压气动机电设备有限公司 | Constant throttling type buffer structure |
| CN113323942B (en) * | 2021-08-03 | 2021-10-19 | 烟台山河液压部件有限公司 | Hydraulic cylinder with buffer performance |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0530540A1 (en) * | 1991-09-05 | 1993-03-10 | Hydraulik Techniek | Hydraulic jack |
| CN101311556A (en) * | 2007-05-22 | 2008-11-26 | 萱场工业株式会社 | Washer and hydrocylinder |
| CN101936318A (en) * | 2010-10-20 | 2011-01-05 | 小冶精通（天津）液压机械有限公司 | Hydraulic cylinder for improving buffering effect |
| CN201747698U (en) * | 2010-08-03 | 2011-02-16 | 江苏龙城洪力液压设备有限公司 | Cushioning device for hydraulic cylinder |
| CN202012529U (en) * | 2011-04-27 | 2011-10-19 | 三一重工股份有限公司 | Hydraulic cylinder and buffering device of same |
-
2011
- 2011-04-27 CN CN 201110107413 patent/CN102155468B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0530540A1 (en) * | 1991-09-05 | 1993-03-10 | Hydraulik Techniek | Hydraulic jack |
| CN101311556A (en) * | 2007-05-22 | 2008-11-26 | 萱场工业株式会社 | Washer and hydrocylinder |
| CN201747698U (en) * | 2010-08-03 | 2011-02-16 | 江苏龙城洪力液压设备有限公司 | Cushioning device for hydraulic cylinder |
| CN101936318A (en) * | 2010-10-20 | 2011-01-05 | 小冶精通（天津）液压机械有限公司 | Hydraulic cylinder for improving buffering effect |
| CN202012529U (en) * | 2011-04-27 | 2011-10-19 | 三一重工股份有限公司 | Hydraulic cylinder and buffering device of same |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102155468A (en) | 2011-08-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102155468B (en) | Hydraulic cylinder and cushioning device of hydraulic cylinder | |
| KR101342081B1 (en) | Cushion ring and fluid-pressure cylinder | |
| CN202012528U (en) | Hydraulic cylinder and buffer device thereof | |
| CN102042280B (en) | Piston cylinder | |
| CN104712701A (en) | Multi-hole adjustable multi-variable-load hydraulic buffer | |
| CN106593989B (en) | A kind of hydraulic cylinder, hydraulic system and engineering machinery | |
| CN202756521U (en) | Hydraulic recovery and cushion shock absorber | |
| CN103994125A (en) | Adjustable bi-directional buffering oil cylinder | |
| CN105020203A (en) | High-speed cylinder in which pneumatic buffering devices are arranged | |
| CN201284769Y (en) | Floating buffering mechanism of hydraulic cylinder | |
| CN203685765U (en) | Oil cylinder buffering structure | |
| CN203051288U (en) | Hydraulic cylinder, driving mechanism and concrete conveying machinery | |
| CN202012529U (en) | Hydraulic cylinder and buffering device of same | |
| CN106151160A (en) | There is hydraulic jack and the excavator of pooling feature | |
| CN202612262U (en) | Piston cylinder and engineering machinery | |
| CN102410278A (en) | Multistage single-action hydraulic cylinder and engineering machinery provided with same | |
| CN102996570B (en) | Single-action double-graded hydraulic cylinder and engineering machine | |
| CN103629188B (en) | Buffer device for actuator drum | |
| CN105650055A (en) | Dual-piston-rod hydraulic cylinder | |
| CN203009440U (en) | Single-action two-stage hydraulic cylinder and engineering machine | |
| CN102705294B (en) | A kind of high-voltage oil cylinder and comprise the excavator of this oil cylinder | |
| CN104963908A (en) | Actuator cylinder of integrated variable damping device | |
| EA016137B1 (en) | Shock absorber for transport vehicle | |
| KR20120134783A (en) | Valve structure of shock absorber | |
| CN104204551A (en) | Hydraulic cylinder |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130703 Termination date: 20150427 |
|
| EXPY | Termination of patent right or utility model |