CN112682387B - Automatic return steering oil cylinder - Google Patents
Automatic return steering oil cylinder Download PDFInfo
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- CN112682387B CN112682387B CN202110045439.6A CN202110045439A CN112682387B CN 112682387 B CN112682387 B CN 112682387B CN 202110045439 A CN202110045439 A CN 202110045439A CN 112682387 B CN112682387 B CN 112682387B
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Abstract
The invention relates to an automatic return steering cylinder which comprises a cylinder assembly, a piston rod assembly, a return piston and a pressure sensor assembly, wherein the cylinder assembly comprises a cylinder barrel, a return limiting ring and a cylinder barrel, the diameter of a middle rod is larger than that of a front rod and a rear rod, step-type reducing is arranged between the middle rod and the front rod and between the middle rod and the rear rod, a fixed rod piston is fixed at the step-type reducing part of the middle rod, which is close to the rear rod, and is arranged in the cylinder barrel to slide left and right, the return piston is arranged on the front rod, the return piston is matched with the cylinder barrel and can slide relatively with the front rod of the piston, cylinder barrel plugging devices are arranged at the outer ports of left and right cylinders, oil way inlets and outlets are arranged in the rings of the return limiting ring, and pressure sensors are arranged at the corresponding parts of the cylinder barrel plugging devices at the left and the right sides. The self-rotation middle-turning oil cylinder has the advantages of simple structure, accurate return, low cost and low failure rate, and achieves the aim of the invention.
Description
Technical Field
The invention relates to an automatic return steering cylinder.
Background
At present, the number of low-speed vehicles adopting hydraulic steering is increased, the automatic centering of the steering wheels of the vehicles is a key technology, some of the vehicles adopt two sets of oil cylinders to be matched for use, and other technical routes such as potential switch detection median position are adopted, so that the defects of complex structure, low precision, high cost and the like exist.
Disclosure of Invention
The invention aims to provide a self-rotating middle steering oil cylinder with a novel structure, which has the advantages of simple structure, accurate return, low cost and low failure rate.
The automatic return steering cylinder comprises a cylinder assembly, a piston rod assembly, a return piston and a pressure sensor assembly, wherein the cylinder assembly comprises a cylinder barrel, a return limiting ring and a cylinder barrel, the piston rod assembly comprises a fixed rod piston and a piston rod, the piston rod comprises a front rod, a middle rod and a rear rod, the diameter of the middle rod is larger than that of the front rod and that of the rear rod, step-type reducing parts between the middle rod and the front rod and between the middle rod and the rear rod are formed, the fixed rod piston is fixed at the step-type reducing parts of the middle rod, which are close to the rear rod, and is arranged in the cylinder barrel to slide left and right, the return piston is arranged on the front rod, the return piston is matched with the cylinder barrel and can slide relatively to the front rod of the piston, a cylinder barrel plugging device is arranged at the outer port of a left cylinder barrel 1, an oil way inlet and an oil outlet are formed in the left side of the return piston all the time; the outer port of the right cylinder barrel 2 is provided with a cylinder barrel plugging device, the cylinder barrel 2 is provided with an oil way inlet and an oil way outlet, and the oil inlet and the oil outlet are always kept at the right side of the fixed rod piston; an oil way inlet and an oil way outlet are arranged in the ring of the centering limiting ring, and the oil way inlet and the oil way outlet of the centering limiting ring are always kept between the centering piston and the fixed rod piston; the diameter of the centering limiting ring is larger than that of the middle rod and smaller than the outer diameters of the centering piston and the fixed rod piston; the cylinder barrel corresponding parts on the left side and the right side are provided with pressure sensors, a front rod, a middle rod and a rear rod of the piston rod are integrated into a whole, the front rod penetrates through the center of the left cylinder barrel plugging device and extends out of the rod end, and the rear rod penetrates through the center of the right cylinder barrel plugging device and extends out of the rod end. The left cylinder blocking device arranged at the outer port of the left cylinder not only seals the left cylinder, but also has the left side stop function of the centering piston on the inner side end surface; the right cylinder blocking device arranged at the outer port of the right cylinder seals the right cylinder, and the inner end surface of the right cylinder plays a role in stopping the right movement of the fixed rod piston; the inner diameter of the centering limiting ring at the middle part of the cylinder barrel is far larger than the outer diameter of the piston rod, and the centering limiting ring has a limiting effect on the centering piston and the fixed rod piston. The diameter of the middle rod of the piston rod is larger than that of the front rod and the rear rod, step-type reducing is arranged between the middle rod and the front rod and between the middle rod and the rear rod, the fixed rod piston is fixed at the step-type reducing part of the middle rod, which is close to the rear rod, and is arranged in the cylinder barrel to slide left and right, and the end face of the step-type reducing part can play a role in stopping and limiting. The diameter of the return limiting ring at the middle part of the cylinder barrel is far larger than that of the middle rod, so that the piston rod is ensured to freely move in the return limiting ring, and meanwhile, the smoothness of an oil way arranged at an oil way inlet and an oil way outlet of the return limiting ring is ensured. The diameter of the inner ring of the centering limiting ring at the middle part of the cylinder barrel is smaller than the diameters of the centering piston and the fixed rod piston, and the side walls at two sides of the centering limiting ring can play a limiting role on the centering piston and the piston.
When the piston rod assembly is in a left extending state or a right extending state, the system sends out an instruction, oil is firstly fed from the oil way inlet and outlet 7, the oil way inlet and outlet 8 and the oil way inlet and outlet 9 return oil, the fact that the centering piston 6 moves rightwards or tends to rightwards stop at the left end face of the centering limiting ring 3 is ensured, until the pressure of the system rises to a set value, the pressure sensor 1001 sends out an electric signal, and the oil way inlet and outlet 7 stops feeding oil and locks; simultaneously, an oil inlet signal is sent to the oil way inlet and outlet 8, the oil way inlet and outlet 8 is filled, the piston rod assembly moves leftwards, the left movement is stopped when the end face of the stepped variable diameter part on the left side of the middle rod 502 contacts the right end face of the return piston 6, the oil way inlet and outlet 8 continuously feeds oil until the system pressure rises to a designed fixed value, the pressure sensor 1002 sends an electric signal, the oil way inlet and outlet 8 stops feeding oil and locks, at the moment, the piston rod assembly of the oil cylinder is in the middle position, and the oil way inlet and outlet 9 keeps an oil return state in the process of returning the piston rod assembly. The automatic return steering oil cylinder has the advantages of simple structure, accurate return, low cost and low failure rate, and achieves the aim of the invention.
The invention is also characterized in that the inlet and the outlet of the oil way are welded with connectors in a matching way.
The invention is also characterized in that the oil way inlet and outlet 7 is arranged near the inner side end of the left cylinder blocking device 101, and the oil way inlet and outlet 8 is arranged near the inner side end of the right cylinder blocking device 201.
The invention is also characterized in that the diameters of the left cylinder barrel and the right cylinder barrel are the same.
The invention is also characterized in that the cylinder barrel assembly is provided with a fixed support.
The invention is also characterized in that the working length of the cylinder barrel where the fixed rod piston is positioned is longer than that of the cylinder barrel where the return piston is positioned; the working path of the fixed rod piston is larger than that of the centering piston. Therefore, if the piston rod after centering is required to move rightwards, the joint 9 at the inlet and the outlet of the oil way is filled with oil, and meanwhile, the piston rod 5 of the oil return cylinder at the joint 8 at the inlet and the outlet of the oil way is moved rightwards; the steering function is realized, the structure is simple and flexible, and the left and right steering function is realized.
The invention is also characterized in that the limiting position of the left movement of the end surface of the fixed rod piston is the right end surface of the propping-back limiting ring.
The invention is also characterized in that the working parts of the front rod and the rear rod are equal-diameter rods, and the diameters of the front rod and the rear rod can be the same or different.
The invention is also characterized in that the length of the front rod is the same as the length of the rear rod, and the lengths of the front rod and the rear rod can be different.
Drawings
FIG. 1 is a schematic cross-sectional view of a piston rod assembly of the present invention in a neutral position;
FIG. 2 is an enlarged view of a portion of FIG. 1A;
FIG. 3 is an enlarged view of a portion of FIG. 1B;
FIG. 4 is an enlarged view of a portion of FIG. 1C;
FIG. 5 is a schematic cross-sectional view of the piston rod assembly of the present invention at the left end;
FIG. 6 is a schematic cross-sectional view of the piston rod assembly of the present invention at the right end;
FIG. 7 is a schematic view of a cylinder assembly according to the present invention;
FIG. 8 is a schematic view of the piston rod assembly of the present invention;
FIG. 9 is a schematic view of the structure of the automatic return steering cylinder of the present invention;
fig. 10 is a schematic view of an application environment of the automatic return steering cylinder of the present invention.
Detailed Description
The following embodiments are only a part of, but not all, embodiments of the present invention, and all other embodiments obtained by a person skilled in the art without making any creative effort based on the embodiments of the present invention are included in the protection scope of the present invention, and terms such as up, down, left, right, etc. appearing in the description are used for better understanding of the technical solutions described in this document and are not specifically designated.
In the following drawings of the present invention, the numerals are the same, and the description thereof is the same. The hydraulic cylinder comprises a left cylinder barrel 1, a left cylinder barrel plugging device 101, a left cylinder barrel oil passing concave area 102, a right cylinder barrel 2, a right cylinder barrel plugging device 201, a right cylinder barrel oil passing concave area 202, a centering limiting ring 3, a fixed rod piston 4, a piston rod 5, a front rod 501, a middle rod 502, a rear rod 503, a centering piston 6, an oil way inlet and outlet 7 arranged on the cylinder barrel 1, a joint 701 of matching welding of the oil way inlet and outlet 7, an oil way inlet and outlet 8 arranged on the cylinder barrel 2, a joint 801 of matching welding of the oil way inlet and outlet 8, a joint 9 of matching welding of the oil way inlet and outlet 9 in a ring arranged on the centering limiting ring, a pressure sensor 901 arranged on the corresponding part of the cylinder barrel 1, a pressure sensor 1002 arranged on the corresponding part of the cylinder barrel 2 and a fixed support 11.
As shown in figure 1, the automatic return steering cylinder comprises a cylinder assembly, a piston rod assembly, a return piston and a pressure sensor assembly, wherein the cylinder assembly is formed by welding a cylinder 1, a return limiting ring 3, a cylinder 2, joints 701, 801, 901 and the like; the piston rod assembly consists of a fixed rod piston 4 and a piston rod 5, the piston rod 5 consists of a front rod 501, a middle rod 502 and a rear rod 503, the diameter of the middle rod 502 is larger than that of the front rod 501 and the rear rod 503, a stepped diameter is formed between the middle rod 502 and the front rod 501 and between the middle rod 502 and the rear rod 503, the fixed rod piston 4 is fixed at the stepped diameter part of the middle rod 502 close to the rear rod 503 and is arranged in a cylinder barrel 2 to slide left and right, a centering piston 6 is arranged on the front rod 501, the centering piston 6 is matched with the cylinder barrel 1 and can slide relatively to the front rod 501, a left cylinder barrel plugging device 101 is arranged at the outer port of the cylinder barrel 1, an oil way inlet and outlet joint 7 is arranged at the outer port of the cylinder barrel 2, a right cylinder barrel plugging device 201 is arranged at the outer port of the cylinder barrel 2, an oil way inlet and outlet joint 8 is arranged in the ring of the centering limiting ring 3, and the diameter of the centering limiting ring 3 is larger than that of the middle rod 502 and smaller than the diameters of the centering piston 6 and the fixed rod piston 4; the cylinder 1 is provided with a pressure sensor 1001 at the corresponding position, the cylinder 2 is provided with a pressure sensor 1002 at the corresponding position, the piston rod assembly is in the middle position, and the extending distances of the two ends of the cylinder piston rod assembly are the same.
As shown in fig. 5, the oil inlet and outlet joint 8 of the oil way is filled with oil, the oil way inlet and outlet joint 7 and the oil way inlet and outlet joint 9 of the oil way are both filled with oil, and the piston rod assembly extends leftwards.
As shown in fig. 6, the oil inlet and outlet joint 9 of the oil way is used for oil inlet, the oil outlet and inlet joint 8 of the oil way is used for oil outlet, and the piston rod assembly extends to the right.
And (3) automatic return of the oil cylinder: the oil is fed into the oil way inlet and outlet joint 7, the oil way inlet and outlet joint 9 and the oil way inlet and outlet joint 8, the return piston 6 moves rightwards and stops at the left end face of the return limiting ring 3, the pressure sensor 1001 sends out an electric signal along with the increase of the system pressure to a set value, and the oil way inlet and outlet joint 7 stops feeding and locking; after receiving the signal, the oil way inlet and outlet joint 8 is changed into oil inlet, the piston rod assembly moves leftwards, the left movement is stopped when the end face of the step-type reducing part on the left side of the middle rod 502 touches the right end face of the return piston 6, when the system pressure rises to a designed fixed value, the pressure sensor 1002 sends out an electric signal, the oil way inlet and outlet joint 8 stops oil inlet and locking, and the oil cylinder is at the middle position at the moment, as shown in fig. 1.
In normal operation, if the fixed rod piston 4 moves leftwards, the oil inlet and outlet connectors 8 of the oil way enter oil, and meanwhile the oil return of the oil way inlet and outlet connectors 9 and 7 of the oil way inlet and outlet connectors are carried out, the centering piston 6 also moves to the left; if the oil way is moved rightwards, the oil way inlet and outlet joint 9 is filled with oil, and meanwhile, the oil way inlet and outlet joint 8 returns to the oil cylinder piston rod 5 to move rightwards; the steering function is realized.
Claims (10)
1. The automatic return steering cylinder comprises a cylinder assembly, a piston rod assembly, a return piston and a pressure sensor assembly, wherein the cylinder assembly comprises a left cylinder (1), a return limiting ring (3) and a right cylinder (2), the piston rod assembly comprises a fixed rod piston (4) and a piston rod (5), the automatic return steering cylinder is characterized in that the piston rod consists of a front rod (501), a middle rod (502) and a rear rod (503), the diameter of the middle rod (502) is larger than that of the front rod (501) and the rear rod (503), the diameter of the middle rod (502) is in a stepped shape between the middle rod (502) and the front rod (501) and the rear rod (503), the fixed rod piston (4) is fixed at the stepped diameter part of the middle rod (502) close to the rear rod (503) and is arranged in the right cylinder (2) and slides left and right, the return limiting ring (6) is arranged on the front rod (501), the return piston (6) is matched with the left cylinder (1), the outer port of the left cylinder (1) is provided with a left plugging device (101), the left cylinder (1) is provided with an oil way (7), the right cylinder (2) is provided with an inlet and outlet (3) is arranged on the right cylinder (2), the diameter of the inner ring of the centering limiting ring (3) is larger than the diameter of the middle rod (502) and smaller than the outer diameters of the centering piston (6) and the fixed rod piston (4); a pressure sensor (1001) is arranged at the corresponding position of the left cylinder barrel (1), and a pressure sensor (1002) is arranged at the corresponding position of the right cylinder barrel (2); the device is characterized in that a front rod (501), a middle rod (502) and a rear rod (503) of the piston rod are integrated rods, the front rod (501) penetrates through the center of the left cylinder blocking device (101) and extends out of the rod end, and the rear rod (503) penetrates through the center of the right cylinder blocking device (201) and extends out of the rod end; when the piston rod assembly is in a left-extending or right-extending state, the system sends out an instruction, oil is firstly fed from the oil way inlet and outlet (7), the oil way inlet and outlet (8) and (9) return oil, the rightward movement (or the rightward trend) of the centering piston (6) is ensured to be stopped at the left end face of the centering limiting ring (3), until the pressure of the system rises to a set value, the pressure sensor (1001) sends out an electric signal, and the oil way inlet and outlet (7) stops feeding oil and is locked; simultaneously, an oil inlet signal is sent to an oil way inlet and outlet (8), the oil way inlet and outlet (8) is used for oil inlet, a piston rod assembly moves leftwards, the left movement is stopped when the end face of a step-type variable part on the left side of a middle rod (502) touches the right end face of a return piston (6), the oil way inlet and outlet (8) continuously enters oil until the pressure of the system rises to a designed fixed value, a pressure sensor (1002) sends out an electric signal, the oil way inlet and outlet (8) stops oil inlet and locking, at the moment, the piston rod assembly of the oil cylinder is in a middle position, and in the return process of the piston rod assembly, the oil way inlet and outlet (9) all keep an oil return state.
2. The automatic return steering cylinder according to claim 1, wherein the oil passage inlet and outlet (7) is provided with a joint (701) in a matched welding manner, the oil passage inlet and outlet (8) is provided with a joint (801) in a matched welding manner, and the oil passage inlet and outlet (9) is provided with a joint (901) in a matched welding manner.
3. The automatic return steering cylinder according to claim 2, wherein the oil passage inlet and outlet (7) is provided near the inner end of the left cylinder block device (101), and the oil passage inlet and outlet (8) is provided near the inner end of the right cylinder block device (201).
4. An automatic return steering cylinder according to claim 3, characterized in that the cylinder assembly is provided with a fixed support (11).
5. An automatic return steering cylinder according to claim 3, characterized in that the working length of the right cylinder (2) is greater than the working length of the left cylinder (1).
6. The automatic return steering cylinder according to claim 5, characterized in that the working path of the rod-fixed piston (4) is larger than the working path of the return piston (6).
7. The automatic return steering cylinder according to claim 6, wherein the limit position of the left end surface of the fixed rod piston (4) moving leftwards is the right end surface of the return limiting ring (3).
8. The automatic return steering cylinder according to claim 7, wherein the working parts of the front rod (501) and the rear rod (503) are equal diameter rods, and the diameters of the front rod (501) and the rear rod (503) may be the same or different.
9. The automatic return steering cylinder according to claim 8, wherein the front rod (501) has the same length as the rear rod (503) or has different lengths.
10. An automatic return steering cylinder according to claim 3, characterized in that the inner end surfaces of the left cylinder blocking device (101) and the right cylinder blocking device (201) are provided with a left cylinder oil passing concave area (102) and a right cylinder oil passing concave area (202).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110045439.6A CN112682387B (en) | 2021-01-14 | 2021-01-14 | Automatic return steering oil cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110045439.6A CN112682387B (en) | 2021-01-14 | 2021-01-14 | Automatic return steering oil cylinder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112682387A CN112682387A (en) | 2021-04-20 |
| CN112682387B true CN112682387B (en) | 2023-05-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110045439.6A Active CN112682387B (en) | 2021-01-14 | 2021-01-14 | Automatic return steering oil cylinder |
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| Country | Link |
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| CN (1) | CN112682387B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202320474U (en) * | 2011-11-30 | 2012-07-11 | 重庆卡福汽车制动转向系统有限公司 | Automobile steering power cylinder assembly |
| CN202320475U (en) * | 2011-11-30 | 2012-07-11 | 重庆卡福汽车制动转向系统有限公司 | Steering power cylinder assembly for heavy-duty truck |
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| CN101451556B (en) * | 2007-11-30 | 2012-01-11 | 中国航空工业第一集团公司沈阳发动机设计研究所 | Hydraulic pressure moving tube with emergency back function |
| CN101737365B (en) * | 2009-12-17 | 2012-11-28 | 中联重科股份有限公司 | Mobile crane, steering mid positioning and locking device and mid cylinder thereof |
| CN201784677U (en) * | 2010-09-03 | 2011-04-06 | 长沙中联重工科技发展股份有限公司 | Steering boosting middle cylinder, axle hydraulic steering system and runabout crane |
| DE102013202802A1 (en) * | 2013-02-21 | 2014-08-21 | Saf-Holland Gmbh | hydraulic unit |
| CN103711830A (en) * | 2013-12-24 | 2014-04-09 | 常州容大结构减振设备有限公司 | Novel intelligent damper |
| CN104295557B (en) * | 2014-10-09 | 2016-08-17 | 徐州重型机械有限公司 | A kind of middle position locking oil cylinder and engineering truck |
| CN104564897B (en) * | 2014-12-29 | 2016-09-14 | 东风汽车公司 | Integrated form drives centering hydraulic cylinder |
| ES2821198T3 (en) * | 2017-02-17 | 2021-04-23 | Special Springs Srl | Gas cylinder actuator with safety device for uncontrolled piston-rod return |
| CN107355439B (en) * | 2017-08-08 | 2023-05-16 | 华南理工大学 | Integrated internal expansion type mechanical locking hydraulic support leg and operation method thereof |
| CN108045432B (en) * | 2018-01-16 | 2023-08-25 | 江苏徐工国重实验室科技有限公司 | Steering cylinder, hydraulic power steering system, steering axle and vehicle |
| CN111894940B (en) * | 2020-08-05 | 2022-02-18 | 合力（天津）能源科技股份有限公司 | Mechanical oil cylinder structure capable of automatically reciprocating |
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2021
- 2021-01-14 CN CN202110045439.6A patent/CN112682387B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202320474U (en) * | 2011-11-30 | 2012-07-11 | 重庆卡福汽车制动转向系统有限公司 | Automobile steering power cylinder assembly |
| CN202320475U (en) * | 2011-11-30 | 2012-07-11 | 重庆卡福汽车制动转向系统有限公司 | Steering power cylinder assembly for heavy-duty truck |
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| CN112682387A (en) | 2021-04-20 |
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