阅读说明：本技术 一种自动回中转向油缸 (Automatic turn to hydro-cylinder in return ) 是由 宋浩民 孙国明 赵金奎 杨志远 于 2021-01-14 设计创作，主要内容包括：本发明及自动回中转向油缸,包括缸筒总成、活塞杆总成、回位活塞、压力传器总成,缸筒总成包括缸筒、回中限位环和缸筒,其中中间杆直径大于前杆和后杆,中间杆与前杆、后杆之间为台阶型变径,固杆活塞固定在中间杆靠近后杆的台阶型变径部位,并设置在缸筒中左右滑动,在前杆上设置有回中活塞,所述回中活塞与缸筒匹配,且可与活塞前杆相对滑动,左、右侧缸筒的外端口设置有缸筒封堵装置,该缸筒封堵装置处设置有油路进出口,所述的回中限位环的环中设置有油路进出口,在左右两边的缸筒封堵装置相应部位设置有压力传感器。该自转回中转向油缸结构简单,回位准确,成本低,故障率低,实现了本发明的目的。(The invention relates to an automatic-returning steering oil cylinder, which comprises a cylinder barrel assembly, a piston rod assembly, a return piston and a pressure transmitter assembly, wherein the cylinder barrel 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, stepped reducing is formed among the middle rod, the front rod and the rear rod, a fixed rod piston is fixed at the stepped reducing part of the middle rod 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 and is matched with the cylinder barrel and can slide relative to the front rod of the piston, outer ports of the left and right cylinder barrels are provided with cylinder barrel plugging devices, oil passages are arranged at the cylinder barrel plugging devices, oil passage inlets and outlets are arranged in the rings of the return limiting ring, and pressure sensors are arranged at corresponding parts of the left and right cylinder barrel plugging. The self-rotation centering steering oil cylinder is simple in structure, accurate in return, low in cost and low in failure rate, and the purpose of the invention is achieved.)

1. The automatic return steering oil cylinder comprises a cylinder barrel assembly, a piston rod assembly, a return piston and a pressure sensor assembly, wherein the cylinder barrel assembly comprises a cylinder barrel (1), a return limiting ring (3) and a cylinder barrel (2), the piston rod assembly comprises a fixed rod piston (4) and a piston rod (5), and the automatic return steering oil cylinder is characterized in that the piston rod consists of a front rod (501), a middle rod (502) and a rear rod (503), wherein the diameter of the middle rod (502) is larger than that of the front rod (501) and the rear rod (503), the middle rod (502), the front rod (501) and the rear rod (503) are in stepped reducing, the fixed rod piston (4) is fixed at the stepped reducing part of the middle rod (502) close to the rear rod (503) and is arranged in the cylinder barrel (2) to slide left and right, the return piston (6) is arranged on the front rod (501), the return piston (6) is matched with the cylinder barrel (1) and can slide relative to the front rod (501), a cylinder barrel plugging device (101) is arranged at an outer port of the cylinder barrel (1), an oil way inlet and outlet (7) is arranged on the cylinder barrel (1), a cylinder barrel plugging device (201) is arranged at the outer port of the cylinder barrel (2), an oil way inlet and outlet (8) is arranged on the cylinder barrel (2), an oil way inlet and outlet (9) is arranged in a ring of the centering limiting ring (3), the diameter of an inner ring of the centering limiting ring (3) is larger than that 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 part of the cylinder barrel (1), and a pressure sensor (1002) is arranged at the corresponding part of the cylinder barrel (2); when the piston rod assembly is in a left-extending or right-extending state, the system sends an instruction, oil is fed from an oil path inlet and outlet (7), oil is fed from oil path inlet and outlet (8) and oil path outlet and outlet (9), it is ensured that a centering piston (6) moves rightwards (or tends to move rightwards) and stops at the left end face of a centering limit ring (3), until the system pressure rises to a set value, a pressure sensor (1001) sends an electric signal, and the oil path inlet and outlet (7) stops feeding oil and is locked; and meanwhile, an oil inlet signal is sent to the oil way inlet and outlet (8), the oil way inlet and outlet (8) is filled with oil, the piston rod assembly moves leftwards, the left movement is stopped when the end face of the stepped reducing part on the left side of the middle rod (502) touches the right end face of the centering piston (6), the oil way inlet and outlet (8) continues to be filled with oil, until the system pressure is raised to a designed fixed value, the pressure sensor (1002) sends an electric signal, the oil way inlet and outlet (8) stops being filled with oil and is locked, at the moment, the piston rod assembly of the oil cylinder is in a middle position, and the oil way inlet and outlet (.

2. The automatic turning oil cylinder according to claim 1, wherein a joint (701) is welded at the oil path inlet/outlet (7) in a matching manner, a joint (801) is welded at the oil path inlet/outlet (8) in a matching manner, and a joint (901) is welded at the oil path inlet/outlet (9) in a matching manner.

3. The automatic turning cylinder according to claim 2, wherein the oil passage inlet/outlet (7) is disposed near the inner end of the cylinder block device (101), and the oil passage inlet/outlet (8) is disposed near the inner end of the cylinder block device (201).

4. The automatic turn-around steering cylinder according to claim 3, wherein the cylinder assembly is provided with a fixing support (11).

5. The automatic turn-around steering cylinder according to claim 3, characterized in that the working length of the cylinder tube (2) is longer than the working length of the cylinder tube (1).

6. The automatic turning cylinder according to claim 5, characterized in that the working path of the rod fixing piston (4) is larger than that of the turning piston (6).

7. The automatic turning cylinder according to claim 6, characterized in that the limit position of the left end face of the fixed rod piston (4) moving to the left is against the right end face of the turning limit ring (3).

8. The automatic turning cylinder according to claim 7, characterized in that the working parts of the front rod (501) and the rear rod (503) are equal diameter rods, and the diameter of the front rod (501) and the diameter of the rear rod (503) can be the same or different.

9. The automatic turn-around steering cylinder according to claim 8, characterized in that the length of the front rod (501) is the same as or different from the length of the rear rod (503).

10. The automatic turning cylinder according to claim 3, characterized in that the inner end faces of the cylinder block device (101) and the cylinder block device (201) are provided with oil passing concave areas (102), (202).

Technical Field

The invention relates to an automatic turning oil cylinder.

Background

At present, hydraulic steering is adopted for low-speed vehicles increasingly, automatic centering of steering wheels of the vehicles is a key technology, some vehicles adopt two sets of oil cylinders to be matched, and some technical routes such as potential switches for detecting the middle position and the like all have the defects of complex structure, low precision, high cost and the like.

Disclosure of Invention

The invention aims to provide a self-rotation and centering steering oil cylinder with a novel structure, which is simple in structure, accurate in resetting, low in cost and low in failure rate.

The automatic return steering oil cylinder comprises a cylinder barrel assembly, a piston rod assembly, a return piston and a pressure sensor assembly, wherein the cylinder barrel 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 consists of 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 the rear rod, stepped reducing is formed among the middle rod, the front rod and the rear rod, the fixed rod piston is fixed at the stepped 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 front rod is provided with the return piston, the return piston is matched with the cylinder barrel and can slide relative to the front rod of the piston, the outer port of the left side 1 is provided with a cylinder barrel plugging device, the cylinder barrel 1 is provided with an oil path inlet and outlet, and the oil inlet and outlet are always kept; 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 path inlet and outlet, and the oil inlet and outlet are always kept on the right side of the fixed rod piston; an oil passage inlet and an oil passage outlet are arranged in the ring of the centering limit ring, and the oil passage inlet and the oil passage outlet arranged on the centering limit ring are always kept between the centering piston and the fixed rod piston; the diameter of the inner ring of the centering limit ring is larger than that of the middle rod and smaller than the outer diameters of the centering piston and the fixed rod piston; pressure sensors are arranged at the corresponding parts of the cylinder barrels at the left side and the right side. The cylinder barrel plugging device arranged at the outer port of the left cylinder barrel not only seals the left cylinder barrel, but also plays a role in stopping the left piston at the inner side end face; the cylinder barrel plugging device arranged at the outer port of the right cylinder barrel seals the right cylinder barrel, and meanwhile, the inner end face of the right cylinder barrel also plays a role in stopping the piston of the fixed rod to move rightwards; the inner diameter of the centering limit ring in the middle of the cylinder barrel is far larger than the outer diameter of the piston rod, and the centering limit ring plays a role in limiting 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, stepped reducing is formed among the middle rod, the front rod and the rear rod, the fixed rod piston is fixed at the stepped reducing part of the middle rod close to the rear rod and arranged in the cylinder barrel to slide left and right, and the end face of the stepped reducing part can play a role in stopping and limiting. The diameter of the inner ring of the centering limit ring in the middle of the cylinder barrel is far larger than that of the middle rod, so that the piston rod can freely move in the centering limit ring, and the smoothness of an oil path arranged at an oil path inlet and an oil path outlet of the centering limit ring is guaranteed. The diameter of the inner ring of the centering limit ring in the middle of the cylinder barrel is smaller than the diameters of the centering piston and the fixed rod piston, and the side walls on the two sides of the centering limit ring can limit the centering piston and the piston.

When the piston rod assembly is in a left-extending or right-extending state, the system sends an instruction, oil is fed from an oil path inlet and outlet 7, oil is fed from oil path inlet and outlet 8 and oil path outlet 9, it is ensured that a centering piston 6 moves rightwards or tends to stop rightwards at the left end face of a centering limiting ring 3, until the system pressure rises to a set value, a pressure sensor 1001 sends an electric signal, and the oil path inlet and outlet 7 stops feeding oil and is locked; meanwhile, an oil inlet signal is sent to the oil way inlet and outlet 8, the oil way inlet and outlet 8 is filled with oil, the piston rod assembly moves leftwards, the left movement is stopped when the end face of the stepped reducing part on the left side of the middle rod 502 touches the right end face of the centering piston 6, the oil way inlet and outlet 8 is filled with oil continuously, until the system pressure is increased to a designed fixed value, the pressure sensor 1002 sends an electric signal, the oil way inlet and outlet 8 is stopped to fill oil and is locked, at the moment, the piston rod assembly of the oil cylinder is in a middle position, and the oil way inlet and. The automatic-return steering oil cylinder is simple in structure, accurate in return, low in cost and low in failure rate, and the purpose of the invention is achieved.

The invention is also characterized in that the inlet and the outlet of the oil way are welded with joints in a matching way.

The invention is also characterized in that the oil path inlet and outlet 7 is arranged near the end close to the inner side of the cylinder barrel plugging device 101, and the oil path inlet and outlet 8 is arranged near the end close to the inner side of the cylinder barrel plugging device 201.

The invention is also characterized in that the diameters of the left cylinder and the right cylinder 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 centering 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 returning to the center moves rightwards, the joint 9 of the oil path inlet and outlet is fed with oil, and meanwhile, the joint 8 of the oil path inlet and outlet is fed with the oil returning oil cylinder piston rod 5 to move rightwards; the steering function is realized, the structure is simple and flexible, and the function of left-right steering is realized.

The invention is also characterized in that the limit position of the fixed rod piston end surface moving leftwards is the right end surface which is propped against the centering limit ring.

The invention is characterized in that the front rod and the rear rod are equal-diameter rods, and the diameter of the front rod and the diameter of 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 that 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 a partial enlarged view of FIG. 1B;

FIG. 4 is a partial enlarged view of FIG. 1B;

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 at the right end of the present invention;

FIG. 7 is a schematic view of the construction of the cylinder assembly of the present invention;

FIG. 8 is a schematic view of a piston rod assembly according to the present invention;

FIG. 9 is a schematic structural view of an automatic return steering cylinder according to the present invention;

fig. 10 is a schematic view of an application environment of the automatic return steering cylinder according to the present invention.

Detailed Description

The technical solutions of the present invention will be described in further detail with reference to the accompanying drawings and specific implementation, where the following embodiments are only a part of the embodiments of the present invention, rather than all embodiments, and all other embodiments obtained by those skilled in the art without any inventive work based on the embodiments of the present invention belong to the protection scope of the present invention, and the directional terms such as up, down, left, right, etc. appearing in the description are for facilitating better understanding of the technical solutions described in the description of the present invention and are not specifically designated.

In the following drawings of the present invention, the same reference numerals are used and the same description is given. The hydraulic cylinder comprises a left cylinder barrel 1, a left cylinder barrel plugging device 101, a left cylinder oil passing concave area 102, a right cylinder barrel 2, a right cylinder barrel plugging device 201, a right cylinder oil passing concave area 202, a right cylinder oil passing concave area 3, a centering limit ring 4, 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 path inlet and outlet 7 arranged on the cylinder barrel 1, a connector 701 welded with the oil path inlet and outlet 7 in a matched mode, an oil path inlet and outlet 8 arranged on the cylinder barrel 2, a connector 801 welded with the oil path inlet and outlet 8 in a matched mode, an oil path inlet and outlet in a ring arranged on the centering limit ring 9, a connector 901 welded with the oil path inlet and outlet 9 in a matched mode, a pressure sensor 1001 arranged at a corresponding position of the cylinder barrel 1, a pressure sensor 1002 arranged at a corresponding position of the cylinder barrel 2, and.

As shown in figure 1, the automatic turning steering oil cylinder comprises a cylinder barrel assembly, a piston rod assembly, a return piston and a pressure transmitter assembly, wherein the cylinder barrel assembly is formed by welding a cylinder barrel 1, a turning limiting ring 3, a cylinder barrel 2, joints 701, 801, 901 and the like; the piston rod assembly is composed of a fixed rod piston 4 and a piston rod 5, the piston rod 5 is composed of a front rod 501, a middle rod 502 and a rear rod 503, wherein the diameter of the middle rod 502 is larger than that of the front rod 501 and the rear rod 503, stepped reducing is arranged between the middle rod 502 and the front rod 501 as well as between the middle rod 502 and the rear rod 503, the fixed rod piston 4 is fixed at the stepped reducing part of the middle rod 502 close to the rear rod 503 and is arranged in the 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 relative to the front rod 501, the outer port of the cylinder barrel 1 is provided with a cylinder barrel plugging device 101, the cylinder barrel 1 is provided with an oil passage inlet and outlet joint 7, the outer port of the cylinder barrel 2 is provided with a cylinder barrel plugging device 201, the cylinder barrel 2 is provided with an oil passage inlet and outlet joint 8, an oil passage inlet and outlet joint 9 is, is smaller than the diameters of the centering piston 6 and the fixed rod piston 4; a pressure sensor 1001 is arranged at the corresponding part of the cylinder barrel 1, a pressure sensor 1002 is arranged at the corresponding part of the cylinder barrel 2, the piston rod assembly is positioned at the middle position, and the extending distances of the two ends of the oil cylinder piston rod assembly are the same.

As shown in fig. 5, the oil inlet and outlet joint 8 of the oil path takes oil, the oil inlet and outlet joint 7 of the oil path and the oil inlet and outlet joint 9 of the oil path both take oil, and the piston rod assembly extends to the left.

As shown in fig. 6, oil is fed into the oil path inlet/outlet joint 9, oil is discharged from the oil path inlet/outlet joint 8, and the piston rod assembly extends to the right.

The oil cylinder automatically returns to the center: oil is fed into an oil path inlet and outlet joint 7, oil is discharged from an oil path inlet and outlet joint 9 and an oil path inlet and outlet joint 8, a centering piston 6 moves rightwards and stops at the left end face of a centering limiting ring 3, a pressure sensor 1001 sends an electric signal along with the rise of the system pressure to a set value, and the oil path inlet and outlet joint 7 stops feeding oil and is locked; after receiving the signal, the oil inlet and outlet joint 8 is changed into oil inlet, the piston rod assembly moves leftwards, the end face of the stepped reducing part on the left side of the middle rod 502 stops moving leftwards when touching the right end face of the centering piston 6, when the system pressure rises to a designed fixed value, the pressure sensor 1002 sends an electric signal, the oil inlet and outlet joint 8 stops oil inlet and is locked, and the oil cylinder is at the middle position as shown in fig. 1.

When the piston moves leftwards in normal work, the oil inlet and outlet connector 8 of the oil way takes oil, meanwhile, the oil inlet and outlet connector 9 of the oil way returns oil, the oil inlet and outlet connector 7 of the oil way returns oil, the fixed rod piston 4 moves leftwards, and the centering piston 6 also moves to the left side; if the oil way moves rightwards, the oil inlet and outlet connector 9 of the oil way takes oil, and meanwhile, the oil return inlet and outlet connector 8 of the oil way returns the piston rod 5 of the oil cylinder to move rightwards; the steering function is realized.