Suspension oil cylinder

Abstract

The utility model discloses a suspension oil cylinder which comprises a cylinder body, a piston, a first piston rod, a second piston rod and a valve block, the second piston rod is arranged in the first piston rod, the second piston rod and the first piston rod are of hollow structures, and the first piston rod and the second piston rod are fixed through a connecting plate. A one-way valve structure and a damping structure are arranged in a valve block arranged on the outer wall of the oil cylinder, and a replaceable damping plug screw is arranged in the damping structure. One end of the one-way valve structure is communicated with one end of the damping structure through a first channel, and the first channel is communicated with an annular cavity in the first piston rod through a first flow channel arranged in the lifting lug; the other end of the one-way valve structure is communicated with the other end of the damping structure through a second channel, and the second channel is communicated with an inner cavity of the second piston rod through a second flow channel arranged in the lifting lug. The size of the damping hole is changed by replacing the damping plug screw to control the size of the damping force, so that the optimal operation stability and comfort are achieved, the overall structure is integrated and stable, and the manufacturing cost, the research and development cost and the cycle of the oil cylinder are reduced.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic cylinder technology, specifically to a suspension cylinder. Background Technology

[0002] Suspension cylinders are a crucial component of hydraulic suspension systems, improving ride comfort and damping vibrations. They are widely used in various equipment and scenarios. Compared to other suspension systems, hydropneumatic suspensions combine elastic and damping elements, exhibiting superior nonlinear elastic characteristics and excellent vibration damping performance. The performance of suspension cylinders is typically judged by ride comfort and handling stability. Damping, as a vibration damping element in hydropneumatic suspensions, has a significant impact on vehicle driving performance. Insufficient damping improves ride comfort but reduces handling stability, while excessive damping improves handling stability but reduces ride comfort.

[0003] Currently, the damping holes in commonly used suspension cylinders are designed inside the cylinder and are of a fixed size. As a result, they provide different shock absorption and cushioning effects for different road conditions, and have limited improvement on the vehicle's driving smoothness and handling stability. Utility Model Content

[0004] The technical problem to be solved by this utility model is: to solve the technical problems of existing technology where the damping magnitude cannot be adjusted during use, it is inconvenient to replace the damping performance, and the overall structure has low integration.

[0005] Therefore, this utility model provides a suspension cylinder that integrates a one-way valve structure and a damping structure into a valve block and places them externally. The damping magnitude can be adjusted very conveniently as needed. Through structural improvements, connecting pipes and other structures are placed inside the cylinder, simplifying the structural layout of the suspension cylinder, making the overall structure more integrated and stable, improving the vehicle's adaptability to different working conditions, improving the vehicle's driving performance, and at the same time helping to damping heat dissipation and reducing the risk of seal failure.

[0006] The technical solution adopted by this utility model to solve its technical problem is: a suspension cylinder, characterized in that it includes a cylinder body, a piston, a first piston rod, a second piston rod, and a valve block.

[0007] The second piston rod is coaxially disposed inside the first piston rod and both are hollow structures. The first piston rod and the second piston rod are fixedly connected by a connecting plate.

[0008] The valve block is located on the outer wall of the cylinder. The valve block has a one-way valve structure and a damping structure inside. The damping structure has a replaceable damping screw plug.

[0009] One end of the one-way valve structure and one end of the damping structure are communicated through a first channel, the first channel is communicated with an annular cavity in the first piston rod through a first flow channel arranged in the lug;

[0010] The other end of the one-way valve structure and the other end of the damping structure are communicated through a second channel, the second channel is communicated with the inner cavity of the second piston rod through a second flow channel arranged in the lug.

[0011] Further, a cylinder bottom is further included, the cylinder bottom is fixedly connected with the right side of the cylinder body, the inside of the cylinder body is divided into a rodless cavity and a rod cavity by the piston, the rodless cavity is communicated with the inner cavity of the second piston rod through the piston, and an inflation valve for inflating the rodless cavity is further arranged on the cylinder bottom.

[0012] Further, the rod cavity is communicated with the annular cavity in the first piston rod through a circle of oil passing holes arranged on the first piston rod.

[0013] Further, the first channel and the second channel are arranged in the valve block and are parallel to the radial direction of the cylinder body.

[0014] Further, a first channel and a second channel are arranged in the valve block, the first channel and the second channel are communicated, the diameter of the first channel is greater than the diameter of the second channel, a steel ball is arranged at the first channel, the diameter of the steel ball matches the inner diameter of the first channel and is greater than the diameter of the second channel, and the first channel, the second channel and the steel ball jointly constitute the one-way valve structure.

[0015] Further, a third channel is further arranged in the valve block, the damping screw plug is arranged in the third channel, the damping screw plug has a damping hole, and the third channel and the damping screw plug jointly constitute the damping structure.

[0016] Further, a first screw plug is further arranged on the valve block to block the one-way valve structure, a second screw plug is further arranged on the valve block to block the damping structure, and the damping screw plug with different sizes of damping holes can be replaced by removing the second screw plug.

[0017] Further, a guide sleeve is further included, the guide sleeve is connected with the left end of the cylinder body through threads and is locked, and a first sealing ring is arranged between the guide sleeve and the cylinder body.

[0018] Further, a first guide ring, a sealing assembly and a dustproof ring are sequentially arranged on the inner side of the guide sleeve, and a second guide ring and a second sealing ring are sequentially arranged between the piston and the inner wall of the cylinder body.

[0019] Further, the lifting lug is fixedly connected with the left side of the first piston rod, and the valve block is arranged on the outer wall of the lifting lug.

[0020] The utility model discloses beneficial effect is, through increasing valve block in the outer wall of oil cylinder, canceling and integrating the damping structure and check valve structure in the valve block originally in oil cylinder, and the damping is external, which helps the damping heat dissipation, reduces the risk of sealing failure, avoids the viscosity reduction of hydraulic oil after temperature rise to influence the damping effect, and simultaneously, the check valve structure and damping structure cooperate with each other to control the size of damping force by making the oil passing area of damping hole controllable, so that the best maneuverability and comfort are reached. The size transformation of damping hole can be realized by replacing damping screw plug, and the adaptability of vehicle to different road conditions is improved. Through the improvement of overall structure, the chamber, connecting pipeline and other structures are reasonably arranged in the cylinder body, the structure arrangement of suspension oil cylinder is simplified, the overall structure is more integrated and stable, the radial dimension is small, and the arrangement of the whole vehicle is more favorable. Not only the manufacturing cost is reduced, but also the damping parameters are quantitatively designed in the process of research and development sample, and the research and development cost and period of early or later change are reduced. BRIEF DESCRIPTION OF DRAWINGS

[0021] The utility model will be further explained in connection with the drawings and examples.

[0022] Figure 1 It is the axial section view of the suspension oil cylinder of the utility model.

[0023] Figure 2 It is the axial section view of the valve block of an embodiment of the utility model.

[0024] In the drawing: 1, cylinder body;2, piston;3, first piston rod;4, second piston rod;5, lifting lug;6, valve block;7, connecting plate;8, check valve structure;9, damping structure;10, first channel;11, second channel;12, first flow channel;13, second flow channel;14, annular cavity;15, inner cavity;16, cylinder bottom;17, rodless cavity;18, rod cavity;19, inflation valve;20, oil passing hole;21, guide sleeve;22, second guide ring;23, second sealing ring;601, first channel;602, second channel;603, steel ball;604, third channel;605, damping screw plug;606, damping hole;607, first screw plug;608, second screw plug;609, third screw plug;610, fourth screw plug;211, first sealing ring;212, first guide ring;213, sealing assembly;214, dustproof ring;6021, conical surface. DETAILED DESCRIPTION

[0025] The utility model will be further explained in connection with the drawings and examples.

[0022] Figure 1 It is the axial section view of the suspension oil cylinder of the utility model.

[0023] Figure 2 It is the axial section view of the valve block of an embodiment of the utility model.

[0024] In the drawing: 1, cylinder body;2, piston;3, first piston rod;4, second piston rod;5, lifting lug;6, valve block;7, connecting plate;8, check valve structure;9, damping structure;10, first channel;11, second channel;12, first flow channel;13, second flow channel;14, annular cavity;15, inner cavity;16, cylinder bottom;17, rodless cavity;18, rod cavity;19, inflation valve;20, oil passing hole;21, guide sleeve;22, second guide ring;23, second sealing ring;601, first channel;602, second channel;603, steel ball;604, third channel;605, damping screw plug;606, damping hole;607, first screw plug;608, second screw plug;609, third screw plug;610, fourth screw plug;211, first sealing ring;212, first guide ring;213, sealing assembly;214, dustproof ring;6021, conical surface. DETAILED DESCRIPTION

[0025] The utility model will be further explained in connection with the drawings and examples.

[0022] Figure 1 It is the axial section view of the suspension oil cylinder of the utility model.

[0023] Figure 2 It is the axial section view of the valve block of an embodiment of the utility model.

[0024] In the drawing: 1, cylinder body;2, piston;3, first piston rod;4, second piston rod;5, lifting lug;6, valve block;7, connecting plate;8, check valve structure;9, damping structure;10, first channel;11, second channel;12, first flow channel;13, second flow channel;14, annular cavity;15, inner cavity;16, cylinder bottom;17, rodless cavity;18, rod cavity;19, inflation valve;20, oil passing hole;21, guide sleeve;22, second guide ring;23, second sealing ring;601, first channel;602, second channel;603, steel ball;604, third channel;605, damping screw plug;606, damping hole;607, first screw plug;608, second screw plug;609, third screw plug;610, fourth screw plug;211, first sealing ring;212, first guide ring;213, sealing assembly;214, dustproof ring;6021, conical surface. DETAILED DESCRIPTION

[0025] The utility model will be further explained in connection with the drawings and examples.

[0026] In the description of the utility model, it needs to be understood that, the orientation or positional relation indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" are based on the orientation or positional relation shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as limiting the utility model by indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model. In addition, the features limited by "first" and "second" can explicitly or implicitly include one or more features. In the description of the utility model, "a plurality of" means two or more, unless otherwise specified.

[0027] In the description of the utility model, it needs to be understood that, the orientation or positional relation indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" are based on the orientation or positional relation shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as limiting the utility model by indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model. In addition, the features limited by "first" and "second" can explicitly or implicitly include one or more features. In the description of the utility model, "a plurality of" means two or more, unless otherwise specified.

[0028] As Figure 1 And Figure 2 As shown in the utility model, the suspension oil cylinder comprises a cylinder body 1, a piston 2, a first piston rod 3, a second piston rod 4 and a valve block 6, the first piston rod 3 and the piston 2 are slidably arranged in the cylinder body 1, the second piston rod 4 is coaxially arranged in the first piston rod 3 and both are hollow structures, and the first piston rod 3 and the second piston rod 4 are fixedly connected by a connecting plate 7 on the side close to the piston 2; an ear 5 is fixedly connected to the left side of the first piston rod 3; the valve block 6 is arranged on the outer wall of the oil cylinder, the valve block 6 is internally provided with a one-way valve structure 8 and a damping structure 9, and the damping structure 9 is provided with a replaceable damping plug 605; more specifically, the valve block 6 is arranged on the outer wall of the oil cylinder and can be arranged on the ear 5 or the first piston rod 3 or the cylinder body 1. In the embodiment, the valve block 6 is arranged on the outer wall of the ear 5. One end of the one-way valve structure 8 and one end of the damping structure 9 are communicated through a first channel 10, and the first channel 10 is communicated with an annular cavity 14 in the first piston rod 3 through a first flow channel 12 arranged in the ear 5; the other end of the one-way valve structure 8 and the other end of the damping structure 9 are communicated through a second channel 11, and the second channel 11 is communicated with an inner cavity 15 of the second piston rod 4 through a second flow channel 13 arranged in the ear 5.

[0029] That is, because the damping structure is placed on the piston rod inside the cylinder in the prior art, the damping size cannot be adjusted during use after production, the damping performance cannot be conveniently changed, and if the damping is forcibly changed, the piston rod needs to be re-made, greatly increasing the research and development cycle and cost, and fixed damping has a great impact on vehicle life and operation stability for different road conditions. In addition, the damping hole is arranged inside the oil cylinder in the prior art, and after being impacted, the impact energy is converted into heat, causing the oil temperature to rise, the viscosity of the hydraulic oil to decrease, and the damping effect to be affected. In the embodiment of the utility model, the one-way valve structure 8 and the damping structure 9 are integrated in the valve block 6 and designed outside the oil cylinder, the one-way valve structure 8 and the damping structure 9 cooperate with each other to make the oil passing area of the damping hole 606 a controllable variable to control the size of the damping force to achieve the best operation stability and comfort. When the vehicle travels on different road conditions, the damping screw plug 605 can be replaced to adjust the damping, thereby improving the driving performance of the vehicle when responding to different road surfaces. The damping structure 9 is external, which is easy to dissipate heat, reduces the risk of sealing failure, and also avoids the influence of the decrease in the viscosity of the hydraulic oil after temperature rise on the damping effect. Preferably, the left end of the one-way valve structure 8 and the left end of the damping structure 9 are communicated through the first channel 10, and the right end of the one-way valve structure 8 and the right end of the damping structure 9 are communicated through the second channel 10, the communication path is the shortest, the structure is compact and simple, and the space occupation is reduced.

[0030] In addition, in the embodiment, the valve block 6 is close to the outside of the oil cylinder, which is convenient for cooperation with the first flow channel 12 and the second flow channel 13 arranged in the lifting lug 5, and no connecting pipeline or flow channel is left outside the oil cylinder. The internal space of the oil cylinder is reasonably utilized to shorten the radial dimension and reduce the probability of damage of the pipeline or flow channel due to external force. The hollow structure of the first piston rod 3 and the second piston rod 4 is sleeved together and fixedly connected by a connecting plate 7 through bolts, welding or threads (such as Figure 1 In the preferred embodiment of the embodiment, welding is adopted, which has large rigidity, simple structure and better sealing performance. After the first piston rod 3 and the second piston rod 4 are fixedly connected, the space between the inner wall of the first piston rod 3 and the outer wall of the second piston rod 4 forms an annular cavity 14, the space inside the second piston rod 4 is an inner cavity 15, the first channel 10 is communicated with the annular cavity 14 through the first flow channel 12, and the second channel 11 is communicated with the inner cavity 15 through the second flow channel 13. The oil port is integrated on the rod head side of the first piston rod 3 and the second piston rod 4 through the internal pipeline, which is beneficial to the compact structure design of the system, improves the structural stability and integration degree, and also facilitates the processing and connection of each internal pipeline, saving manufacturing cost.

[0031] Specifically, the suspension oil cylinder further comprises a cylinder bottom 16 fixedly connected with the right side of the cylinder body 1, the inside of the cylinder body 1 is divided into a rodless cavity 17 and a rod cavity 18 by the piston 2, the rodless cavity 17 is communicated with the inner cavity 15 of the second piston rod 4 through the hole axially penetrating the piston 2, and the cylinder bottom 16 is further provided with a charging valve 19 for charging the rodless cavity 17 with gas. The charging valve 19 not only fills the rodless cavity 17 with gas into the inner cavity 15 communicated with the rodless cavity 17, but also is directly installed on the cylinder bottom 16, so that the overall structure of the oil cylinder is simple and the bearing capacity is large, and the oil cylinder can also be applied to the structure of an external accumulator. The rod cavity 18 is communicated with the annular cavity 14 in the first piston rod 3 through a circle of oil passing holes 20 arranged on the first piston rod 3.

[0032] The suspension oil cylinder of the utility model is a piston type oil-gas mixed oil cylinder, for example, the medium used in the suspension oil cylinder of the utility model is hydraulic oil and nitrogen, the installation state is that the first piston rod 3 and the second piston rod 4 are in a vertical state and the lifting lug 5 is located at the lower end, the hydraulic oil is injected through an oil injection port (not shown in the figure), the hydraulic oil fills the rodless cavity 17 and then sequentially passes through the inner cavity 15, the second flow channel 13, the second duct 11, the one-way valve structure 8 and the damping structure 9 of the valve block 6, and then sequentially passes through the first duct 10, the first flow channel 12, the annular cavity 14 and the oil passing hole 20 into the rod cavity 18, the air outlet (not shown in the figure) on the cylinder body 1 is opened, the air in the oil cylinder is exhausted, the air in the oil cylinder is ensured to be free, the air outlet is closed after the oil filling is completed, and then high-pressure nitrogen is injected from the charging valve 19, the first piston rod 3 and the second piston rod 4 are stopped from being ventilated after being pushed out by the piston 2, compared with the traditional external accumulator type suspension oil cylinder, the utility model improves the structure, reduces the number of cavities and external additional components, and simplifies the structure of the suspension oil cylinder.

[0033] In the embodiment, considering that the cylinder body 1 and the lifting lug 5 are both arranged in the axial direction, the first duct 10 and the second duct 11 are both arranged in the valve block 6 and parallel to the radial direction of the cylinder body 1, the communication path is the shortest, the structure is simple and compact, one end of the first duct 10 penetrates the valve block 6 and is connected with the first flow channel 12, the other end of the first duct 10 is plugged by the third screw plug 609 arranged above the valve block 6, one end of the second duct 11 penetrates the valve block 6 and is connected with the second flow channel 13, and the other end of the second duct 11 is plugged by the fourth screw plug 610 arranged above the valve block 6, so that the hydraulic oil is prevented from leaking.

[0034] As Figure 2As shown, the first passage 601 and the second passage 602 are formed in the valve block 6, the first passage 601 and the second passage 602 are communicated, the diameter of the first passage 601 is larger than the diameter of the second passage 602, the steel ball 603 is arranged at the first passage 601, the diameter of the steel ball 603 matches the inner diameter of the first passage 601 and is larger than the diameter of the second passage 602, so that the hydraulic oil passing through the second passage 602 unidirectionally pushes the steel ball 603 to flow to the first passage 601, preferably, the side of the second passage 602 close to the first passage 601 is designed as a tapered surface 6021, the hydraulic oil passing through the first passage 601 pushes the steel ball 603 to adhere to the tapered surface 6021 of the second passage 602, so that the hydraulic oil cannot flow to the second passage 602, the first passage 602, the second passage 602 and the steel ball 603 jointly constitute a one-way valve structure 8, the first passage 601 and the second passage 602 are directly formed on the valve block 6 and constitute the one-way valve structure 8 together with the steel ball 603, which is very stable even in complex and harsh working conditions and does not contain electromagnetic interference, and the probability of interference during assembly and disassembly is also very small.

[0035] As shown in the figure, Figure 2 The third passage 604 is also formed in the valve block 6, the damping screw plug 605 is arranged in the third passage 604, the damping screw plug 605 has a damping hole 606, and the third passage 604 and the damping screw plug 605 jointly constitute a damping structure 9. The damping structure 9 also does not contain electromagnetic interference. In the embodiment, when the vehicle runs on a relatively flat road, if the damping hole 606 is too small, the damping force will be too large, the operation stability of the vehicle will be good, but the impact on the vehicle will be obvious, and the driving comfort will be reduced. At this time, the second screw plug 608 on the valve block 6 is removed, the damping screw plug 605 is removed, and a damping screw plug 605 with a larger damping hole 606 is replaced, so as to reduce the damping force and improve the driving performance of the vehicle; when the vehicle runs on a corrugated road, if the damping hole 606 is too large, the damping force will be too small, the operation stability of the vehicle will be poor, and the bumping will be obvious. At this time, the second screw plug 608 is removed, the damping screw plug 605 is removed, and a damping screw plug 605 with a smaller damping hole 606 is replaced, so as to increase the damping force and improve the vibration isolation rate of the vehicle; thus, the damping force of the oil cylinder can be reduced or increased according to different road conditions, the operation and heating of the hydraulic oil in the oil cylinder can be improved, the frame system can be re-entered into the appropriate frequency range, so as to improve the overall life of the vehicle and improve the comfort of the driver.

[0036] It is worth mentioning that the damping structure 9 is arranged inside the cylinder 1 on the oil cylinder rod after the development of the damping structure 9 is completed in the factory, and the size of the damping hole 606 is determined. If you want to change it, you need to replace a new piston rod, which wastes time and labor costs. The suspension oil cylinder adopting the structure can be popularized to vehicles in different industries and fields (such as flat cars, off-road vehicles, buses, mine cars, etc.). During the development and debugging of the vehicle, the size of the damping hole 606 of the damping screw plug 605 can be changed to conveniently realize the best driving performance of the vehicle, and the damping hole 606 can be quantitatively shaped. Even if the subsequent suspension oil cylinder structure is optimized and changed (the cylinder rod diameter and the stroke are unchanged), the parameters of the damping hole 606 can be directly matched for use without the need for further testing and verification, thereby reducing the early or later research and development cost and cycle.

[0037] Specifically, the valve block 6 is also provided with a first screw plug 607 to block the one-way valve structure 8, and the valve block 6 is also provided with a second screw plug 608 to block the damping structure 9. Different sizes of damping holes 606 can be replaced by removing the second screw plug 608. The first screw plug 607 and the second screw plug 608 prevent hydraulic oil leakage. In the embodiment, preferably, the first channel 601, the second channel 602 and the third channel 604 in the valve block are perpendicular to the first channel 10 or the second channel 11. At this time, the channel distance is the shortest, which not only saves cost, but also facilitates the installation, positioning and disassembly of the one-way valve structure 8 and the damping structure 9, and can maximize the prevention of the steel ball 603 and the damping screw plug 605 from falling out of the channel. The rectangular structure formed by the first channel 602, the second channel 602, the third channel 604, the first channel 10 and the second channel 11 can better resist deformation when subjected to external force, and is therefore relatively more stable.

[0038] As shown in Figure 1 The suspension oil cylinder also comprises a guide sleeve 21, the guide sleeve 21 is connected with the left end of the cylinder 1 through threads and is locked, and the first sealing ring 211 is arranged between the guide sleeve 21 and the cylinder 1. The direction from the rodless cavity 17 to the rod cavity 18 is defined as the first direction, and the first guide ring 212, the sealing assembly 213 and the dustproof ring 214 are sequentially arranged on the inner side of the guide sleeve 21 along the first direction. The second guide ring 22 and the second sealing ring 23 are sequentially arranged between the piston 2 and the inner wall of the cylinder 1 along the first direction. The first guide ring 212 supports the guide to realize the reciprocating motion of the guide sleeve 21 and the cylinder 1, and the second guide ring 22 supports the guide to realize the reciprocating motion of the piston 2 and the cylinder 1. The first sealing ring 211, the sealing assembly 213 and the second sealing ring 23 all have the functions of protecting the oil cavity near them and preventing hydraulic oil leakage, and the second sealing ring 23 in them is preferably a Gley ring, which can realize bidirectional sealing. The dustproof ring 214 can prevent external dust and pollutants from entering the oil cylinder.

[0039] The working process of the utility model:

[0040] When the oil cylinder is impacted by external force, the first piston rod 3 and the second piston rod 4 retract, hydraulic oil enters the valve block 6 from the inner cavity 15 through the rodless cavity 17, at this time, the hydraulic oil can pass through the one-way valve structure 8 and the damping structure 9, the oil passing area is large, the damping force is small, and the buffering characteristics of compressed nitrogen gas can be fully utilized; when the impact ends, the first piston rod 3 and the second piston rod 4 extend, and the hydraulic oil enters the valve block 6 from the annular cavity 14 through the annular cavity 14 and the rod cavity 18, at this time, the hydraulic oil can only pass through the damping structure 9, the oil passing area is small, the damping force is large, and the damping shock-absorbing characteristics can be fully utilized.

[0041] Specifically, in combination with Figure 1 and Figure 2 When the oil cylinder is impacted by external force, the first piston rod 3 and the second piston rod 4 retract in the opposite direction of the first direction, and the nitrogen gas in the oil cylinder is compressed. Due to the nonlinear elastic characteristics of the compressed nitrogen gas, the stiffness of the suspension oil cylinder becomes larger and larger, and good buffering effect can be achieved. At the same time, the hydraulic oil enters the second channel 11 in the valve block 6 from the inner cavity 15 through the second flow channel 13 and the rodless cavity 17, at this time, the hydraulic oil will push open the steel ball 603 through the second passage 602 of the one-way valve structure 8 to enter the first passage 601, thereby opening the one-way valve structure 8, so that the hydraulic oil converges to the first channel 10 from the third passage 604 of the one-way valve structure 8 and the damping structure 9, and then flows into the annular cavity 14 through the first flow channel 12, and then flows into the rod cavity 18 through the oil hole 20. Since the one-way valve structure 8 and the damping structure 9 can both pass oil, the oil passing area is large, the damping force is small, the impact energy of the vehicle is stored in the compressed nitrogen gas, and the buffering characteristics of the compressed nitrogen gas can be fully utilized.

[0042] When the impact ends, the compressed nitrogen gas begins to expand and release the impact energy. Under the action of the nitrogen gas pressure, the first piston rod 3 and the second piston rod 4 extend outward along the first direction, and the hydraulic oil will enter the first channel 10 of the valve block 6 from the annular cavity 14, the first flow channel 12, and the oil hole 20 in sequence from the rod cavity 18. At this time, the hydraulic oil pushes the steel ball 603 against the conical surface of the second passage 602 through the first passage 601, so that the steel ball 603 cannot flow to the second passage 602, thereby closing the one-way valve, and the hydraulic oil cannot flow out of the one-way valve structure 8, but can only flow out of the third passage 604 of the damping structure 9, and then flow through the second channel 11 and the second flow channel 13 from the inner cavity 15 to the rodless cavity 17. At this time, since only the damping structure 9 can pass oil, the hydraulic oil flow is throttled to a certain extent, the oil passing area is small, the damping force is large, the shock-absorbing characteristics of the damping can be fully utilized, and the shock-absorbing effect of the vehicle can be achieved.

[0043] In summary, the suspension oil cylinder of the utility model, by increasing valve block on outer wall, damping structure and one-way valve structure are integrated on valve block, damping is external, which is helpful for damping heat dissipation, reduces the risk of sealing failure, avoids the influence of viscosity reduction of hydraulic oil after temperature rise on damping effect, at the same time, one-way valve structure and damping structure cooperate to control the size of damping force by controlling the oil passing area of damping hole, so as to achieve the best stability and comfort. The convenient replacement of the size of the damping hole makes the damping force artificially adjustable, and the adaptability of the vehicle to different road conditions is improved. Through the improvement of the overall structure, the chamber, connecting pipeline and other structures are reasonably arranged inside the cylinder body, the structure arrangement of the suspension oil cylinder is simplified, the overall structure is more integrated and stable, the radial size is small, and the arrangement of the whole vehicle is more favorable. Not only reduce the manufacturing cost, but also facilitate the quantitative design of damping parameters in the process of developing samples, reduce the development cost and period of early or late changes.

[0044] With the above ideal embodiment of the utility model as the inspiration, through the above description, relevant staff can make various changes and modifications without deviating from the technical idea of the utility model. The technical scope of the utility model is not limited to the content in the specification, and must be determined by the scope of claims.

Claims

1. A suspension cylinder, characterized in that It comprises a cylinder (1), a piston (2), a first piston rod (3), a second piston rod (4) and a valve block (6), The second piston rod (4) is coaxially arranged in the first piston rod (3) and both are hollow structures, the first piston rod (3) and the second piston rod (4) are fixedly connected by a connecting plate (7); The valve block (6) is arranged on the outer wall of the oil cylinder, the valve block (6) is internally provided with a one-way valve structure (8) and a damping structure (9), the damping structure (9) is provided with a replaceable damping screw plug (605); One end of the one-way valve structure (8) and one end of the damping structure (9) are communicated through a first channel (10), the first channel (10) is communicated with the annular cavity (14) in the first piston rod (3) through a first flow channel (12) arranged in the ear (5); The other end of the one-way valve structure (8) and the other end of the damping structure (9) are communicated through a second channel (11), the second channel (11) is communicated with the inner cavity (15) of the second piston rod (4) through a second flow channel (13) arranged in the ear (5).

2. The hanging ram as set forth in claim 1, wherein, It also comprises a cylinder bottom (16), the cylinder bottom (16) is fixedly connected with the right side of the cylinder (1), the inside of the cylinder (1) is divided into a rodless cavity (17) and a rod cavity (18) by the piston (2), the rodless cavity (17) is communicated with the inner cavity (15) of the second piston rod (4) through the piston (2), the cylinder bottom (16) is also provided with an inflation valve (19) for inflating the rodless cavity (17).

3. The hanging ram as set forth in claim 2, wherein, The rod cavity (18) is communicated with the annular cavity (14) in the first piston rod (3) through a circle of oil passing holes (20) arranged on the first piston rod (3).

4. The hanging ram as set forth in claim 1, wherein, The first channel (10) and the second channel (11) are arranged in the valve block (6) and parallel to the radial direction of the cylinder (1).

5. The hanging ram as set forth in claim 1, wherein, A first channel (601) and a second channel (602) are arranged in the valve block (6), the first channel (601) and the second channel (602) are communicated, the diameter of the first channel (601) is larger than the diameter of the second channel (602), a steel ball (603) is arranged at the first channel (601), the diameter of the steel ball (603) matches the inner diameter of the first channel (601) and is larger than the diameter of the second channel (602), the first channel (602), the second channel (602) and the steel ball (603) together constitute the one-way valve structure (8).

6. The hanging ram as set forth in claim 1, wherein, A third channel (604) is also arranged in the valve block (6), the damping screw plug (605) is arranged in the third channel (604), the damping screw plug (605) has a damping hole (606), the third channel (604) and the damping screw plug (605) together constitute the damping structure (9).

7. The hanging ram as set forth in claim 1, wherein, The valve block (6) is further provided with a first screw plug (607) for blocking the one-way valve structure (8), and further provided with a second screw plug (608) for blocking the damping structure (9), and the damping screw plug (605) of the damping hole (606) of different sizes can be replaced by removing the second screw plug (608).

8. The hanging ram as set forth in claim 1, wherein, The guide sleeve (21) is connected and locked with the left end of the cylinder body (1) through threads, and the first sealing ring (211) is arranged between the guide sleeve (21) and the cylinder body (1).

9. The hanging ram as set forth in claim 8, wherein, The inner side of the guide sleeve (21) is sequentially provided with the first guide ring (212), the sealing assembly (213) and the dustproof ring (214); and the second guide ring (22) and the second sealing ring (23) are sequentially arranged between the piston (2) and the inner wall of the cylinder body (1).

10. The hanging ram as set forth in claim 1, wherein, The lifting lug (5) is fixedly connected with the left side of the first piston rod (3), and the valve block (6) is arranged on the outer wall of the lifting lug (5).

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