CN203308825U - Automatic precise neutral position return double extension lever cylinder - Google Patents
Automatic precise neutral position return double extension lever cylinder Download PDFInfo
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- CN203308825U CN203308825U CN2013203578809U CN201320357880U CN203308825U CN 203308825 U CN203308825 U CN 203308825U CN 2013203578809 U CN2013203578809 U CN 2013203578809U CN 201320357880 U CN201320357880 U CN 201320357880U CN 203308825 U CN203308825 U CN 203308825U
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Abstract
An automatic precise neutral position return double extension lever cylinder comprises a left piston rod, a right piston rod and a cylinder body, wherein a left pressure spring is sleeved on the left piston rod; the left end of the left pressure spring is propped against the right end of a left spring seat; a left through hole is formed in the middle of the left spring seat; a left screw nut is arranged at the left end of the left piston rod; the right end surface of the left screw nut is matched with the left end surface of the left spring seat; a plurality of left guide location holes are formed near the edge of the left spring seat in a surrounding manner; each left guide location hole in the left spring seat is respectively inserted with a left guide pole in a clearance fit manner; a left positioning screw cap or a left positioning screw nut is respectively arranged at the left end of each left guide pole; the right end surface of the left positioning screw cap or the left positioning screw nut is matched with the right surface of the left spring seat. The invention aims to provide the automatic precise neutral position return double extension lever cylinder which is high in movement precision, low in failure rate, and stable and reliable in performance, and can realize rapid and precise driving for load components.
Description
Technical field
The utility model relates to a kind of two boom cylinders of meta that automatically accurately return.
Background technique
Existing Pneumatic Transmission has working medium easily obtains, and the air of using is without recovery, and air viscosity is little; fluid resistance losses is little; speed is fast, but high speed motion, and the pneumatic apparatus movement velocity is high; be subjected to the such environmental effects such as temperature, humidity little; use safety, simple in structure, easy to maintenance; life-span is long, and the advantages such as overload protection performance are arranged itself.But because gas has compressible row, make existing pair of boom cylinder when needing the piston return and accurately resting on a certain definite position, middle part of cylinder body, it can't realize accurate setting movement, causes thus existing cylinder to be applied in the many fields that comprise the vehicle launch gearshift.
The model utility content
The purpose of this utility model is to provide a kind of kinematic accuracy high, failure rate is low, and long service life, stable and reliable working performance, can realize the accurate two boom cylinders of meta that return automatically that load elements is carried out rapidly, accurately drives.
Automatically the two boom cylinders of meta that accurately return of the present utility model, comprise piston, the left piston bar, right piston rod and cylinder body, the left end of cylinder body is provided with left end cap, the right-hand member of cylinder body is provided with right end cap, on described left piston bar, be set with left pressure spring, the right-hand member of left pressure spring withstands on the left end of described left end cap, the left end of left pressure spring withstands on the right-hand member of left spring seat, the middle part of left spring seat is provided with left through hole, the diameter of left through hole is greater than the diameter of left piston bar, described left piston bar passes left through hole, the left end of left piston bar is provided with more than one left nut, match with the left side of left spring seat in the right side that is positioned at the left nut of right-hand member, near the edge of left spring seat, be provided with a plurality of left guide-localizations hole around ground, the left guide-localization of each on left spring seat hole adopts respectively Spielpassung to be fitted with a left guide rod, the axis of each left guide rod lays respectively at the left and right horizontal direction, the right-hand member of each left guide rod is connected with described cylinder body respectively, the left end of each left guide rod is respectively equipped with left positioning screw cap or left setscrew nut, match with the left side of left spring seat in the right side of left positioning screw cap or left setscrew nut,
Described right upper cover of piston rod is equipped with right pressure spring, the left end of right pressure spring withstands on the right-hand member of described right end cap, the right-hand member of right pressure spring withstands on the left end of right spring seat, the middle part of right spring seat is provided with right through hole, the diameter of right through hole is greater than the diameter of right piston rod, described right piston rod passes right through hole, the right-hand member of right piston rod is provided with more than one right nut, match with the right side of right spring seat in the left side that is positioned at the right nut of left end, near the edge of right spring seat, be provided with a plurality of right guide-localizations hole around ground, the right guide-localization of each on right spring seat hole adopts respectively Spielpassung to be fitted with a right guide rod, the axis of each right guide rod lays respectively at the left and right horizontal direction, the left end of each right guide rod is connected with described cylinder body respectively, the right-hand member of each right guide rod is respectively equipped with right positioning screw cap or right setscrew nut, match with the right side of right spring seat in the left side of right positioning screw cap or right setscrew nut.
Automatically the two boom cylinders of meta that accurately return of the present utility model, the left and right sides on the sidewall of wherein said cylinder body is respectively equipped with magnetic switch, near the edge of described left spring seat, be provided with 2-6 circular left guide-localization hole around ground, the cross section of described left guide rod is circular, and the quantity of left guide rod equates with the quantity in left guide-localization hole; Near the edge of described right spring seat, be provided with 2-6 circular right guide-localization hole around ground, the cross section of described right guide rod is circular, and the quantity of right guide rod equates with the quantity in right guide-localization hole.
Automatically the two boom cylinders of meta that accurately return of the present utility model, wherein the right-hand member of each described left guide rod is threaded connection respectively with described cylinder body and is connected, and the left end of each right guide rod is threaded connection respectively with described cylinder body and is connected.
Automatically the two boom cylinders of meta that accurately return of the present utility model, the middle part of wherein said cylinder body outer side wall is provided with pin rocker bearing.
Automatically the two boom cylinders of meta that accurately return of the present utility model, the middle part of the right side of wherein said left spring seat has columniform left boss, the left part of described left pressure spring is sleeved on the left boss of left spring seat, the middle part of the left side of left spring seat has left counterbore, and described left nut can enter in left counterbore; The middle part of the left side of described right spring seat has columniform right boss, and the right side part of described right pressure spring is sleeved on the right boss of right spring seat, and the middle part of the right side of right spring seat has right counterbore, and described right nut can enter in right counterbore; The left end of described left end cap is provided with left flange, and the right side part of described left pressure spring is sleeved on the left flange of left end cap, and the right-hand member of described right end cap is provided with right flange, and the left part of described right pressure spring is sleeved on the right flange of right end cap.
Automatically the two boom cylinders of meta that accurately return of the present utility model, wherein when described left piston bar and described right piston rod are in the meta do not stretched out, the acting in conjunction of left pressure spring and right pressure spring, allow the right side of left nut and the bottom in the bottom in left counterbore and right nut and right counterbore keep gap about equally.
Automatically the two boom cylinders of meta that accurately return of the present utility model, the bottom gap in the right side of wherein said left nut and left counterbore is 0.05-0.15mm, the gap of the bottom in described right nut and right counterbore is 0.05-0.15mm.
Automatically the two boom cylinders of meta that accurately return of the present utility model, bottom gap in the right side of wherein said left nut and left counterbore is 0.1mm, the gap of the bottom in described right nut and right counterbore is 0.1mm, described left spring seat is square, four jiaos of left guide-localization holes that are respectively equipped with 1 circle at left spring seat edge; Described right spring seat is square, four jiaos of right guide-localization holes that are respectively equipped with 1 circle at right spring seat edge, and the right-hand member of described right piston rod adopts to be threaded and is installed with draw arm joint.
Automatically the two boom cylinders of accurate time meta of the present utility model in use, when the left piston bar stretches out the left spring seat to left movement under the effect of the pressed gas of right active chamber, the exposed parts of right piston rod hauls right spring seat together to left movement and compress right pressure spring, then shrink and enter in cylinder body, it is motionless that left spring seat and left pressure spring keep, after the pressed gas of right active chamber in cylinder body is released, the outer end that right pressure spring promotes right spring seat and right piston rod to the right moves right, until left piston bar and right piston rod accurately are returned to meta.When right piston rod, move right while stretching out right spring seat under the effect of the pressed gas of left active chamber, the exposed parts of left piston bar hauls the left spring seat and moves right together and compress left pressure spring, then shrink and enter in cylinder body, it is motionless that right spring seat and right pressure spring keep, after the pressed gas of left active chamber in cylinder body is released, left pressure spring promotes the outer end of left spring seat and left piston bar left to left movement, until left piston bar and right piston rod accurately are returned to meta, because the return pressure spring can not cause wearing and tearing to inboard wall of cylinder block, therefore the longer service life of associated components, therefore, automatically it is high that the two boom cylinders of accurate time meta of the present utility model have kinematic accuracy, failure rate is low, long service life, stable and reliable working performance, can realize load elements is carried out rapidly, the characteristics that accurately drive.
Below in conjunction with accompanying drawing, the utility model accurately being returned to the two boom cylinders of meta automatically is described further.
The accompanying drawing explanation
Fig. 1 is the plan view that automatically accurately returns the structural representation of the two boom cylinders of meta of the present utility model;
Fig. 2 is the side view of Fig. 1.
Embodiment
As depicted in figs. 1 and 2, automatically the two boom cylinders of meta that accurately return of the present utility model, comprise piston (not shown in FIG.), left piston bar 1, right piston rod 2 and cylinder body 3, left piston bar 1 and right piston rod 2 share a piston, structurally link into an integrated entity, the left end of cylinder body 3 is provided with left end cap 20, the right-hand member of cylinder body 3 is provided with right end cap 21, on left piston bar 1, be set with left pressure spring 4, the right-hand member of left pressure spring 4 withstands on the left end of left end cap 20, the left end of left pressure spring 4 withstands on the right-hand member of left spring seat 5, the middle part of left spring seat 5 is provided with left through hole 6, the diameter of left through hole 6 is greater than the diameter of left piston bar 1, left piston bar 1 passes left through hole 6, the left end of left piston bar 1 is provided with 1 or 2 left nuts 7, match with the left side of left spring seat 5 in the right side that is positioned at the left nut 7 of right-hand member, near the edge of left spring seat 5, be provided with a plurality of left guide-localizations hole around ground, the left guide-localization of each on left spring seat 5 hole adopts respectively Spielpassung to be fitted with a left guide rod 8, the axis of each left guide rod 8 lays respectively at the left and right horizontal direction, the right-hand member of each left guide rod 8 is connected with cylinder body 3 respectively, the left end of each left guide rod 8 is respectively equipped with left positioning screw cap 9 or left setscrew nut, match with the left side of left spring seat 5 in the right side of left positioning screw cap 9 or left setscrew nut, left pressure spring 4 is in the pre-pressing state usually.
On right piston rod 2, be set with right pressure spring 14, the left end of right pressure spring 14 withstands on the right-hand member of right end cap 21, the right-hand member of right pressure spring 14 withstands on the left end of right spring seat 15, the middle part of right spring seat 15 is provided with right through hole 16, the diameter of right through hole 16 is greater than the diameter of right piston rod 2, right piston rod 2 passes right through hole 16, the right-hand member of right piston rod 2 is provided with 1 right nut 17 (can be also 2), match with the right side of right spring seat 15 in the left side of right nut 17, near the edge of right spring seat 15, be provided with a plurality of right guide-localizations hole around ground, each right guide-localization hole on right spring seat 15 adopts respectively Spielpassung to be fitted with a right guide rod 18, the axis of each right guide rod 18 lays respectively at the left and right horizontal direction, the left end of each right guide rod 18 is connected with cylinder body 3 respectively, the right-hand member of each right guide rod 18 is respectively equipped with right positioning screw cap 19 or right setscrew nut, match with the right side of right spring seat 15 in the left side of right positioning screw cap 19 or right setscrew nut.Right pressure spring 14 is in the pre-pressing state usually.
As improvement of the present utility model, the left and right sides on the sidewall of above-mentioned cylinder body 3 is respectively equipped with magnetic switch 10, so that can accurately control the movement position of left piston bar 1, right piston rod 2, near the edge of left spring seat 5, be provided with 2-6 circular left guide-localization hole around ground, the cross section of left guide rod 8 is circular, and the quantity of left guide rod 8 equates with the quantity in left guide-localization hole; Near the edge of right spring seat 15, be provided with 2-6 circular right guide-localization hole around ground, the cross section of right guide rod 18 is circular, and the quantity of right guide rod 18 equates with the quantity in right guide-localization hole.
As further improvement of the utility model, the right-hand member of above-mentioned each left guide rod 8 is threaded connection respectively with cylinder body 3 and is connected, and the left end of each right guide rod 18 is threaded connection respectively with cylinder body 3 and is connected.The design be threaded can be used for adjusting left spring seat 5, right spring seat 15 position with respect to cylinder body 3, and the pretightening force of the left pressure spring 4 of capable of regulating, right pressure spring 14, further to improve the return precision of left piston bar 1, right piston rod 2.
As further improvement of the utility model, the middle part of above-mentioned cylinder body 3 outer side walls is provided with pin rocker bearing 11.Pin rocker bearing 11 can allow cylinder body 3 do oscillating motion centered by the axis of pin rocker bearing 11.
As further improvement of the utility model, the middle part of the right side of above-mentioned left spring seat 5 has columniform left boss, the left part of left pressure spring 4 is sleeved on the left boss of left spring seat 5, the middle part of the left side of left spring seat 5 has left counterbore 12, and left nut 7 can enter in left counterbore 12; The middle part of the left side of right spring seat 15 has columniform right boss, and the right side part of right pressure spring 14 is sleeved on the right boss of right spring seat 15, and the middle part of the right side of right spring seat 15 has right counterbore 13, and right nut 17 can enter in right counterbore 13; The left end of described left end cap 20 is provided with left flange, and the right side part of left pressure spring 4 is sleeved on the left flange of left end cap 20, and the right-hand member of right end cap 21 is provided with right flange, and the left part of right pressure spring 14 is sleeved on the right flange of right end cap 21.Above-mentioned design can allow the more stable work of whole device, is difficult for breaking down.
As further improvement of the utility model, when left piston bar 1 and right piston rod 2 are in the meta do not stretched out, the acting in conjunction of left pressure spring 4 and right pressure spring 14, allow the right side of left nut 7 and the bottom in the bottom in left counterbore 12 and right nut 17 and right counterbore 13 keep gap about equally.Above-mentioned design can allow the more stable work of whole device, and the kinematic accuracy of left piston bar 1 and right piston rod 2 is higher.
As further improvement of the utility model, the bottom gap in the right side of above-mentioned left nut 7 and left counterbore 12 is 0.05-0.15mm, and the gap of the bottom in right nut 17 and right counterbore 13 is 0.05-0.15mm.Above-mentioned design can further improve the kinematic accuracy of left piston bar 1 and right piston rod 2, the vibration while reducing to move, impact and noise.
As further improvement of the utility model, bottom gap in the right side of above-mentioned left nut 7 and left counterbore 12 is 0.1mm, the gap of the bottom in right nut 17 and right counterbore 13 is 0.1mm, left spring seat 5 is square, four jiaos of left guide-localization holes that are respectively equipped with 1 circle at left spring seat 5 edges; Right spring seat 15 is square, four jiaos of right guide-localization holes that are respectively equipped with 1 circle at right spring seat 15 edges, and the right-hand member of above-mentioned right piston rod 2 adopts to be threaded and is installed with draw arm joint 22.The left end of draw arm joint 22 has tapped hole, draw arm joint 2 is on the one hand by right nut 17 lockings, can be connected with the parts of demand motive on the other hand, accurate for guaranteeing that draw arm joint 22 is connected with the parts of demand motive, can add spacer at right nut 17 and 22 of draw arm joints.Above-mentioned design can further improve the kinematic accuracy of left piston bar 1 and right piston rod 2, the vibration while further reducing to move, impact and noise.
Automatically the two boom cylinders of accurate time meta of the present utility model in use, when left piston bar 1 stretches out left spring seat 5 to left movement under the effect of the pressed gas of right active chamber, the exposed parts of right piston rod 2 hauls right spring seat 15 together to left movement and compress right pressure spring 14, then shrink and enter in cylinder body 3, left spring seat 5 and left pressure spring 4 keep motionless, after the pressed gas of cylinder body 3 interior right active chambers is released, the outer end that right pressure spring 14 promotes right spring seat 15 and right piston rod 2 to the right moves right, until left piston bar 1 and right piston rod 2 accurately are returned to meta.When right piston rod 2 moves right while stretching out right spring seat 15 under the effect of the pressed gas of left active chamber, the exposed parts of left piston bar 1 hauls left spring seat 5 and moves right together and compress left pressure spring 4, then shrink and enter in cylinder body 3, right spring seat 15 and right pressure spring 14 keep motionless, after the pressed gas of cylinder body 3 interior left active chambers is released, left pressure spring 4 promotes the outer end of left spring seat 5 and left piston bar 1 left to left movement, until left piston bar 1 and right piston rod 2 accurately are returned to meta.
Embodiment recited above is described preferred implementation of the present utility model; not scope of the present utility model is limited; do not breaking away under the spiritual prerequisite of the utility model design; various distortion and improvement that the common engineers and technicians in related domain make technical solutions of the utility model, all should fall in the definite protection domain of claims of the present utility model.
Claims (8)
1. automatically accurately return the two boom cylinders of meta, comprise piston, left piston bar (1), right piston rod (2) and cylinder body (3), the left end of cylinder body (3) is provided with left end cap (20), the right-hand member of cylinder body (3) is provided with right end cap (21), it is characterized in that: on described left piston bar (1), be set with left pressure spring (4), the right-hand member of left pressure spring (4) withstands on the left end of described left end cap (20), the left end of left pressure spring (4) withstands on the right-hand member of left spring seat (5), the middle part of left spring seat (5) is provided with left through hole (6), the diameter of left through hole (6) is greater than the diameter of left piston bar (1), described left piston bar (1) passes left through hole (6), the left end of left piston bar (1) is provided with more than one left nut (7), match with the left side of left spring seat (5) in the right side that is positioned at the left nut (7) of right-hand member, near the edge of left spring seat (5), be provided with a plurality of left guide-localizations hole around ground, each left guide-localization hole on left spring seat (5) adopts respectively Spielpassung to be fitted with a left guide rod (8), the axis of each left guide rod (8) lays respectively at the left and right horizontal direction, the right-hand member of each left guide rod (8) is connected with described cylinder body (3) respectively, the left end of each left guide rod (8) is respectively equipped with left positioning screw cap (9) or left setscrew nut, match with the left side of left spring seat (5) in the right side of left positioning screw cap (9) or left setscrew nut,
On described right piston rod (2), be set with right pressure spring (14), the left end of right pressure spring (14) withstands on the right-hand member of described right end cap (21), the right-hand member of right pressure spring (14) withstands on the left end of right spring seat (15), the middle part of right spring seat (15) is provided with right through hole (16), the diameter of right through hole (16) is greater than the diameter of right piston rod (2), described right piston rod (2) passes right through hole (16), the right-hand member of right piston rod (2) is provided with more than one right nut (17), match with the right side of right spring seat (15) in the left side that is positioned at the right nut (17) of left end, near the edge of right spring seat (15), be provided with a plurality of right guide-localizations hole around ground, each right guide-localization hole on right spring seat (15) adopts respectively Spielpassung to be fitted with a right guide rod (18), the axis of each right guide rod (18) lays respectively at the left and right horizontal direction, the left end of each right guide rod (18) is connected with described cylinder body (3) respectively, the right-hand member of each right guide rod (18) is respectively equipped with right positioning screw cap (19) or right setscrew nut, match with the right side of right spring seat (15) in the left side of right positioning screw cap (19) or right setscrew nut.
2. two boom cylinders of meta that automatically accurately return according to claim 1, it is characterized in that: the left and right sides on the sidewall of described cylinder body (3) is respectively equipped with magnetic switch (10), near the edge of described left spring seat (5), be provided with 2-6 circular left guide-localization hole around ground, the cross section of described left guide rod (8) is circular, and the quantity of left guide rod (8) equates with the quantity in left guide-localization hole; Near the edge of described right spring seat (15), be provided with 2-6 circular right guide-localization hole around ground, the cross section of described right guide rod (18) is circular, and the quantity of right guide rod (18) equates with the quantity in right guide-localization hole.
3. two boom cylinders of meta that automatically accurately return according to claim 2, it is characterized in that: the right-hand member of each described left guide rod (8) is threaded connection respectively with described cylinder body (3) and is connected, and the left end of each right guide rod (18) is threaded connection respectively with described cylinder body (3) and is connected.
4. two boom cylinders of meta that automatically accurately return according to claim 3, it is characterized in that: the middle part of described cylinder body (3) outer side wall is provided with pin rocker bearing (11).
5. two boom cylinders of meta that automatically accurately return according to claim 4, it is characterized in that: the middle part of the right side of described left spring seat (5) has columniform left boss, the left part of described left pressure spring (4) is sleeved on the left boss of left spring seat (5), the middle part of the left side of left spring seat (5) has left counterbore (12), and described left nut (7) can enter in left counterbore (12); The middle part of the left side of described right spring seat (15) has columniform right boss, the right side part of described right pressure spring (14) is sleeved on the right boss of right spring seat (15), the middle part of the right side of right spring seat (15) has right counterbore (13), and described right nut (17) can enter in right counterbore (13); The left end of described left end cap (20) is provided with left flange, the right side part of described left pressure spring (4) is sleeved on the left flange of left end cap (20), the right-hand member of described right end cap (21) is provided with right flange, and the left part of described right pressure spring (14) is sleeved on the right flange of right end cap (21).
6. two boom cylinders of meta that automatically accurately return according to claim 5, it is characterized in that: when described left piston bar (1) and described right piston rod (2) are in the meta do not stretched out, the acting in conjunction of left pressure spring (4) and right pressure spring (14), allow the right side of left nut (7) and the bottom in the bottom in left counterbore (12) and right nut (17) and right counterbore (13) keep gap about equally.
7. two boom cylinders of meta that automatically accurately return according to claim 6, it is characterized in that: the bottom gap in the right side of described left nut (7) and left counterbore (12) is 0.05-0.15mm, and the gap of the bottom in described right nut (17) and right counterbore (13) is 0.05-0.15mm.
8. two boom cylinders of meta that automatically accurately return according to claim 7, it is characterized in that: the bottom gap in the right side of described left nut (7) and left counterbore (12) is 0.1mm, the gap of the bottom in described right nut (17) and right counterbore (13) is 0.1mm, described left spring seat (5) is square, four jiaos of left guide-localization holes that are respectively equipped with 1 circle at left spring seat (5) edge; Described right spring seat (15) is square, four jiaos of right guide-localization holes that are respectively equipped with 1 circle at right spring seat (15) edge, and the right-hand member of described right piston rod (2) adopts to be threaded and is installed with draw arm joint (22).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203578809U CN203308825U (en) | 2013-06-21 | 2013-06-21 | Automatic precise neutral position return double extension lever cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203578809U CN203308825U (en) | 2013-06-21 | 2013-06-21 | Automatic precise neutral position return double extension lever cylinder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203308825U true CN203308825U (en) | 2013-11-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013203578809U Withdrawn - After Issue CN203308825U (en) | 2013-06-21 | 2013-06-21 | Automatic precise neutral position return double extension lever cylinder |
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| Country | Link |
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| CN (1) | CN203308825U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103307053A (en) * | 2013-06-21 | 2013-09-18 | 中国人民解放军装甲兵工程学院 | Automatic and precise middle position return double-extension-rod air cylinder |
| CN105150266A (en) * | 2015-09-29 | 2015-12-16 | 苏州斯尔特微电子有限公司 | Vertical push structure for thinning machine |
| CN105605026A (en) * | 2015-12-21 | 2016-05-25 | 中国航空工业集团公司金城南京机电液压工程研究中心 | Hydraulic piston assembly capable of being centered fast |
| CN111874092A (en) * | 2019-04-22 | 2020-11-03 | 中国北方车辆研究所 | Steering return locking mechanism assembly operating system |
-
2013
- 2013-06-21 CN CN2013203578809U patent/CN203308825U/en not_active Withdrawn - After Issue
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103307053A (en) * | 2013-06-21 | 2013-09-18 | 中国人民解放军装甲兵工程学院 | Automatic and precise middle position return double-extension-rod air cylinder |
| CN105150266A (en) * | 2015-09-29 | 2015-12-16 | 苏州斯尔特微电子有限公司 | Vertical push structure for thinning machine |
| CN105605026A (en) * | 2015-12-21 | 2016-05-25 | 中国航空工业集团公司金城南京机电液压工程研究中心 | Hydraulic piston assembly capable of being centered fast |
| CN111874092A (en) * | 2019-04-22 | 2020-11-03 | 中国北方车辆研究所 | Steering return locking mechanism assembly operating system |
| CN111891213A (en) * | 2019-04-22 | 2020-11-06 | 中国北方车辆研究所 | Method and system for controlling return locking mechanism of rear axle steering |
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| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20131127 Effective date of abandoning: 20150617 |
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| RGAV | Abandon patent right to avoid regrant |