Hydraulic cylinder and vehicle

Abstract

The invention provides a hydraulic cylinder and a vehicle. The hydraulic cylinder comprises a cylinder body assembly, a hydraulic valve assembly and a abnormally-moving eliminating device. The cylinder body assembly comprises a cylinder body, a piston and a piston rod. The piston forms an upper cavity and a lower cavity in the cylinder body. The hydraulic valve assembly is arranged on the lower portion of the cylinder body and provided with an oil port, and a telescopic oil way is formed among the oil port, the upper cavity and the lower cavity. The abnormally-moving eliminating device comprises a control valve assembly and an abnormally-moving oil way, the abnormally-moving oil way is arranged between the lower cavity and the oil port, and the control valve assembly is used for controlling the lower cavity to be communicated with the abnormally-moving oil way all the time in the abnormally-moving state, so that abrasion caused by frequent action of the hydraulic valve assembly in the abnormally-moving state is avoided, and the abnormal sound of the cab is greatly improved.

Description

Technical Field

[0001] The present application relates to the technical field of hydraulic cylinders, and in particular to a hydraulic cylinder and a vehicle. Background Art

[0002] At present, medium / heavy trucks mainly use hydraulic transmission systems to realize the cab flipping function to ensure the maintainability of the powertrain area. Usually, the hydraulic flipping system consists of a hydraulic cylinder, an electric / manual hydraulic pump, and connecting oil pipes.

[0003] The hydraulic cylinder provides telescopic transmission function when the cab is raised or lowered, and must have the ability to move when driving. During the moving process, the hydraulic oil will be transferred between the "cylinder-pump" due to the change in the volume of the hydraulic cylinder. The telescopic transmission and moving connection of the existing hydraulic cylinder are based on a common set of in-cylinder oil circuits. In the moving state, the oil needs to overcome the pre-compression force and push open the floating valve to achieve the transfer between the "cylinder-pump". At this time, the force generated by the throttling effect of the oil circuit will be output to the cab. After the cab is subjected to this force, structural vibration and abnormal noise will occur, affecting comfort.

[0004] Therefore, it is necessary to design a hydraulic cylinder that solves the above-mentioned technical problems. Summary of the invention

[0005] The present application provides a hydraulic cylinder and a vehicle, which avoids the wear of the hydraulic valve assembly due to frequent movements in a disabled state, and greatly improves abnormal noise in the cab.

[0006] According to a first aspect of an embodiment of the present specification, there is provided a hydraulic cylinder, comprising: a cylinder assembly, a hydraulic valve assembly and a motion eliminating device; the cylinder assembly comprises a cylinder body, a piston and a piston rod, the piston forming an upper chamber and a lower chamber in the cylinder body; the hydraulic valve assembly is arranged at the lower part of the cylinder body and is provided with an oil port, a telescopic oil circuit is formed between the oil port, the upper chamber and the lower chamber; the motion eliminating device comprises a control valve assembly and a motion oil circuit, the motion oil circuit is arranged between the lower chamber and the oil port, and the control valve assembly is used for controlling the lower chamber and the motion oil circuit to always remain connected in a motion state.

[0007] Furthermore, the control valve assembly includes a control mechanism and a one-way valve assembly, the control mechanism is arranged on the piston and the piston rod, and the one-way valve assembly is arranged on the hydraulic valve assembly and is located between the lower chamber and the actuating oil circuit; in the actuating state, the control mechanism is adsorbed to the one-way valve assembly by magnetic attraction.

[0008] Furthermore, the one-way valve assembly includes a metal valve body, a valve spring and a disc-shaped reed, the metal valve body includes a plug that can close the movable oil circuit and a rod connected to the plug, the valve spring is sleeved outside the rod, the disc-shaped reed is fixed to the lower part of the lower chamber, the two ends of the valve spring respectively abut the plug and the disc-shaped reed, and the middle part of the disc-shaped reed is provided with a through hole through which the rod can extend.

[0009] Furthermore, the control mechanism includes a guide rod, an upper return spring, a lower return spring, a guide seat and a strong magnet; the strong magnet is arranged at one end of the guide rod, and the other end of the guide rod is provided with a step portion, and the upper return spring and the lower return spring are respectively sleeved on both sides of the step portion; a long core hole is provided inside the piston rod, and part of the guide rod, the upper return spring and the lower return spring are blocked in the long core hole through the guide seat, and one end of the guide rod and the strong magnet protrude from the piston rod and are located in the lower cavity.

[0010] Furthermore, in the actuating state, the upper return spring, the lower return spring and the strong magnet act together on the metal valve body to separate the plug of the metal valve body from the actuating oil circuit.

[0011] Further, the hydraulic valve assembly includes a valve block, a floating valve and a hydraulically controlled valve; the valve block is provided with a first valve chamber, a second valve chamber, a main oil channel, a transmission oil circuit and the oil port, and the oil port includes a first oil port and a second oil port; the floating valve is arranged in the first valve chamber, and a first blocking block is arranged on the outer side of the first valve chamber; the hydraulically controlled valve is arranged in the second valve chamber, and a second blocking block is arranged on the outer side of the second valve chamber; the main oil channel is arranged between the first valve chamber and the second valve chamber, and the transmission oil circuit is arranged between the first valve chamber and the lower chamber; the first oil port is connected with the main oil channel, and the second oil port is connected with the second valve chamber.

[0012] Furthermore, the floating valve includes a floating valve core, a first spring is provided between the first blocking block and the floating valve core, and a branch oil channel is provided in the floating valve core; the branch oil channel includes a first branch oil channel, a second branch oil channel and an oil guide hole which are interconnected, the first branch oil channel and the second branch oil channel are respectively close to the first blocking block and the main oil channel, and the oil guide hole connects the second branch oil channel and the first valve chamber; a small sphere, a slider, a second spring and a large sphere are provided in the second branch oil channel, the small sphere is used to control the opening and closing of the first branch oil channel and the second branch oil channel, and the large sphere is used to control the opening and closing of the first valve chamber and the main oil channel.

[0013] Furthermore, the hydraulically controlled valve includes a valve body and a push rod, one end of the valve body is provided with a protrusion smaller than the size of the second valve cavity, the other end of the valve body is connected to the push rod, and the push rod extends from the second valve cavity and abuts against the large sphere.

[0014] Furthermore, a third valve chamber is provided on the valve block, the third valve chamber is arranged between the actuating oil circuit and the lower chamber, and the control valve assembly is partially arranged in the third valve chamber.

[0015] Furthermore, the dynamic oil circuit is connected to the first oil port; in the dynamic state, the opening of the dynamic oil circuit is greater than the opening of the transmission oil circuit.

[0016] Furthermore, it also includes a short oil pipe and a long oil pipe, one end of the long oil pipe is connected to the upper cavity, and the other end of the long oil pipe is connected to the second valve cavity; one end of the short oil pipe is connected to the upper cavity, and the other end of the short oil pipe is connected to the first valve cavity.

[0017] According to a second aspect of an embodiment of the present specification, a vehicle is provided, comprising the hydraulic cylinder described in the first aspect above.

[0018] The present application has the following beneficial effects: by adding a new hydraulic oil circuit, the telescopic transmission and the hydraulic connection are decoupled and separated, the wear of actuators such as the hydraulic valve assembly due to frequent movements in the hydraulic state is avoided, and the abnormal noise in the cab is greatly improved.

[0019] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present specification. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the specification and, together with the description, serve to explain the principles of the specification.

[0021] Figure 1 It is a structural schematic diagram of the hydraulic cylinder of the present application;

[0022] Figure 2 It is a structural schematic diagram of the motion elimination device of the hydraulic cylinder of the present application;

[0023] Figure 3 yes Figure 1 A partial cross-sectional view of

[0024] Figure 4 yes Figure 1 Schematic diagram of the local structure;

[0025] Figure 5 is a schematic diagram of the hydraulic cylinder of the present application;

[0026] Figure 6 is another schematic diagram of the hydraulic cylinder of the present application;

[0027] Figure 7 is a schematic diagram of the hydraulic cylinder of the present application;

[0028] Figure 8 is a schematic diagram of a hydraulic valve assembly of the present application;

[0029] Fig. 9 It is a schematic diagram of the floating valve of the hydraulic cylinder of the present application.

[0030] Description of reference numerals:

[0031] 10-cylinder assembly; 11-cylinder; 111-upper chamber; 112-lower chamber; 12-piston; 13-piston rod; 131-long core hole; 14-short oil pipe; 15-long oil pipe;

[0032] 20-hydraulic valve assembly; 21-valve block; 211-first valve chamber; 2111-oil return hole; 212-second valve chamber; 213-main oil channel; 214-transmission oil circuit; 215-oil port; 2151-first oil port; 2152-second oil port; 216-third valve chamber; 22-floating valve; 221-floating valve core; 2210-branch oil channel; 2211-first branch oil channel; 2212-second branch oil channel; 2213-oil guide hole; 222-first spring; 223-small ball; 224-slider; 225-second spring; 226-large ball; 23-hydraulic control valve; 231-valve body; 232-thrust rod; 233-bump; 24-first blocking block; 25-second blocking block;

[0033] 30-motion elimination device; 31-control valve assembly; 311-control mechanism; 3111-guide rod; 3112-upper return spring; 3113-lower return spring; 3114-guide seat; 3115-strong magnet; 3116-step portion; 312-check valve assembly; 3121-metal valve body; 3122-valve spring; 3123-disc spring; 3124-plug; 3125-rod; 3126-perforation; 32-motion oil circuit. DETAILED DESCRIPTION

[0034] Here, the technical solutions in the embodiments of the present application will be described clearly and completely in conjunction with the accompanying drawings. When the following description refers to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0035] If there are terms involving directional indications or positional relationships in the embodiments of the present application, such terms are only used to explain the relative positional relationship, movement, etc. between the components in a certain specific posture; if the specific posture changes, the directional indication or positional relationship will also change accordingly. In addition, the terms such as "first" and "second" in the embodiments of the present application are only used for the purpose of convenience of description and cannot be understood as indicating or implying relative importance.

[0036] Next, the embodiments of this specification are described in detail.

[0037] Reference Figure 1-2 As shown, the present application discloses a hydraulic cylinder, which includes a cylinder assembly 10, a hydraulic valve assembly 20 and a motion elimination device 30.

[0038] Reference Figure 3-7 As shown, the cylinder assembly 10 includes a cylinder 11, a piston 12 and a piston rod 13. The piston 12 forms an upper chamber 111 and a lower chamber 112 in the cylinder 11. The hydraulic valve assembly 20 is arranged at the lower part of the cylinder 11 and is provided with an oil port 215. A telescopic oil path is formed between the oil port 215, the upper chamber 111 and the lower chamber 112. The oil flows in the telescopic oil path to drive the movement of the piston rod 13.

[0039] The motion elimination device 30 includes a control valve assembly 31 and a motion oil circuit 32. The motion oil circuit 32 is arranged between the lower chamber 112 and the oil port 215. The control valve assembly 31 is used to control the lower chamber 112 and the motion oil circuit 32 to always be connected in the motion state. Figure 3 As shown, the interval a of the control valve assembly 31 between the connection port of the short oil pipe 14 in the cylinder body 11 and the bottom of the cylinder body 11 is a movable interval. When in the movable state, the control valve assembly 31 moves in the interval a.

[0040] The control valve assembly 31 includes a control mechanism 311 and a one-way valve assembly 312. The control mechanism 311 is arranged on the piston 12 and the piston rod 13. The one-way valve assembly 312 is arranged on the hydraulic valve assembly 20 and is located between the lower chamber 112 and the actuating oil circuit 32. In the actuating state, the control mechanism 311 is adsorbed to the one-way valve assembly 312 by magnetic attraction.

[0041] The one-way valve assembly 312 includes a metal valve body 3121, a valve spring 3122 and a disc spring 3123. The metal valve body 3121 includes a plug 3124 that can close the hydraulic oil circuit 32 and a rod 3125 connected to the plug 3124. The valve spring 3122 is sleeved outside the rod 3125. An annular groove is provided on the hydraulic valve assembly 20. The disc spring 3123 is fixed to the lower part of the lower chamber 112 by being clamped in the annular groove. The two ends of the valve spring 3122 abut the plug 3124 and the disc spring 3123 respectively. The middle part of the disc spring 3123 is provided with a through hole 3126 for the rod 3125 to extend out. The radial dimension of the through hole 3126 is smaller than the radial dimension of the plug 3124, so as to ensure that the plug 3124 moves in the hydraulic oil circuit 32 without being magnetically attracted by the control mechanism 311 and entering the lower chamber 112.

[0042] The control mechanism 311 includes a guide rod 3111, an upper return spring 3112, a lower return spring 3113, a guide seat 3114 and a strong magnet 3115. The strong magnet 3115 is arranged at one end of the guide rod 3111, and the other end of the guide rod 3111 is provided with a step portion 3116, and the upper return spring 3112 and the lower return spring 3113 are respectively sleeved on both sides of the step portion 3116. A long core hole 131 is arranged inside the piston rod 13, and part of the guide rod 3111, the upper return spring 3112 and the lower return spring 3113 are blocked in the long core hole 131 through the guide seat 3114, and one end of the guide rod 3111 and the strong magnet 3115 extend beyond the piston rod 13 and are located in the lower cavity 112.

[0043] The valve block 21 is provided with a third valve chamber 216, which is arranged between the actuating oil circuit 32 and the lower chamber 112, and a portion of the control valve assembly 31 is arranged in the third valve chamber 216. The valve spring 3122, the disc spring 3123 and the plug 3124 of the metal valve body 3121 are arranged in the third valve chamber 216, and the portion of the rod 3125 that is magnetically attracted and moved upward by the strong magnet 3115 is located in the lower chamber 112.

[0044] In the actuating state, the upper return spring 3112, the lower return spring 3113 and the strong magnet 3115 act together on the metal valve body 3121, so that the plug 3124 of the metal valve body 3121 is separated from the actuating oil circuit 32. Specifically, the guide rod 3111 is subjected to the upward lifting force of the lower return spring 3113 and the downward compression force of the upper return spring 3112. After the combined force of the two is subtracted from the gravity and inertia force of the guide rod 3111 itself, the remaining upward lifting force can still be greater than the pre-compression force of the valve spring 3122, so that the metal valve body 3121 can be magnetically attracted to the strong magnet 3115 and move in the direction of the upper and lower chambers 112 in the actuating state, so as to control the lower chamber 112 and the actuating oil circuit 32 to always remain connected.

[0045] Reference Figure 8-9As shown, the hydraulic valve assembly 20 includes a valve block 21, a floating valve 22 and a hydraulic control valve 23. The valve block 21 is provided with a first valve cavity 211, a second valve cavity 212, a main oil passage 213, a transmission oil circuit 214 and an oil port 215, and the oil port 215 includes a first oil port 2151 and a second oil port 2152. The floating valve 22 is arranged in the first valve cavity 211, and a first blocking block 24 is arranged outside the first valve cavity 211. The hydraulic control valve 23 is arranged in the second valve cavity 212, and a second blocking block 25 is arranged outside the second valve cavity 212. The main oil passage 213 is arranged between the first valve cavity 211 and the second valve cavity 212, and the transmission oil circuit 214 is arranged between the first valve cavity 211 and the lower cavity 112. The first oil port 2151 is connected to the main oil passage 213, and the second oil port 2152 is connected to the second valve cavity 212.

[0046] The floating valve 22 includes a floating valve core 221. A first spring 222 is provided between the first blocking block 24 and the floating valve core 221. During the normal extension of the first spring 222, the floating valve 22 abuts against the interface between the main oil passage 213 and the first valve chamber 211, so that the main oil passage 213 and the first valve chamber 211 are disconnected. During the extension transmission of the hydraulic cylinder, an oil inlet channel of the high-pressure oil enters the main oil passage 213 from the first oil port 2151 and squeezes the floating valve 22 located at the interface of the main oil passage 213. The floating valve 22 squeezes the first spring 222 toward the first blocking block 24, so that the high-pressure oil enters the first valve chamber 211, and then enters the lower chamber 112 through the transmission oil path 214 connected to the first valve chamber 211.

[0047] A branch oil passage 2210 is provided in the floating valve core 221. The branch oil passage 2210 includes a first branch oil passage 2211, a second branch oil passage 2212 and an oil guide hole 2213 which are interconnected. The first branch oil passage 2211 and the second branch oil passage 2212 are respectively close to the first blocking block 24 and the main oil passage 213. The oil guide hole 2213 connects the second branch oil passage 2212 with the first valve chamber 211.

[0048] A small ball 223, a slider 224, a second spring 225 and a large ball 226 are provided in the second branch oil passage 2212. The small ball 223 is used to control the opening and closing of the first branch oil passage 2211 and the second branch oil passage 2212, and the large ball 226 is used to control the opening and closing of the first valve chamber 211 and the main oil passage 213. The radial dimension of the first branch oil passage 2211 is smaller than the radial dimension of the second branch oil passage 2212, and the small ball 223 abuts against the interface between the first branch oil passage 2211 and the second branch oil passage 2212 to block the first branch oil passage 2211 and the second branch oil passage 2212.

[0049] One end of the slider 224 abuts against the small sphere 223, and the other end is sleeved with one end of the second spring 225, and the other end of the second spring 225 abuts against the large sphere 226. When oil enters from the first branch oil channel 2211, the small sphere 223 is squeezed and the second spring 225 is compressed. The first branch oil channel 2211 is connected to the second branch oil channel 2212, and the oil enters the first valve chamber 211 from the oil guide hole 2213 of the second branch oil channel 2212, and then enters the lower chamber 112 through the transmission oil path 214 connected to the first valve chamber 211.

[0050] An oil return hole 2111 is provided in the first valve chamber 211, and the oil return hole 2111 is arranged between the first spring 222 and the floating valve core 221, and is communicated with the first branch oil channel 2211. The hydraulic cylinder also includes a short oil pipe 14, one end of which is communicated with the upper chamber 111, and the other end of which is communicated with the first valve chamber 211. In the upward state of the movement, the oil in the upper chamber 111 flows to the oil return hole 2111 through the short oil pipe 14, and then the oil in the oil return hole 2111 flows back to the lower chamber 112 through the floating valve core 221. Considering that in the upward stage of the movement, the piston rod 13 will also extend outward, and the lower chamber 112 will form a vacuum trend. If the oil in the upper chamber 111 cannot be replenished in time through the short oil pipe 14, the oil return hole 2111, the floating valve core 221 and the transmission oil circuit 214 in sequence, sufficient oil will be sucked in from the first oil port 2151 to fill it.

[0051] The hydraulic control valve 23 includes a valve body 231 and a push rod 232. One end of the valve body 231 is provided with a convex block 233 smaller than the size of the second valve cavity 212, so as to increase the oil in the second valve cavity 212 at the convex block 233, so as to squeeze the hydraulic control valve 23. The other end of the valve body 231 is connected to the push rod 232, which extends from the second valve cavity 212 and abuts against the part of the large ball 226 located in the main oil passage 213. The push rod 232 is used to control the part of the large ball 226 in the main oil passage 213 to realize the opening and closing of the main oil passage 213 and the first valve cavity 211.

[0052] A third valve chamber 216 is provided on the valve block 21 . The third valve chamber 216 is arranged between the actuating oil circuit 32 and the lower chamber 112 . A portion of the control valve assembly 31 is arranged in the third valve chamber 216 .

[0053] The dynamic oil circuit 32 is connected to the first oil port 2151. In the dynamic state, since the dynamic oil circuit 32 is always open, the floating valve 22 closes the main oil channel 213 and the lower chamber 112, so the oil enters the lower chamber 112 from the dynamic oil circuit 32 first, and the opening of the dynamic oil circuit 32 is greater than the opening of the transmission oil circuit 214, which reduces the damping value of the dynamic process. The opening here refers to the flow rate of the oil in the oil circuit.

[0054] The hydraulic cylinder also includes a long oil pipe 15, one end of which is connected to the upper chamber 111, and the other end of which is connected to the second valve chamber 212. During the contraction transmission process, high-pressure oil enters the second valve chamber 212 from the second oil port 2152, pushing the push rod 232 on the hydraulic control valve 23 to move toward the direction close to the first blocking block 24 to squeeze the floating valve 22, so that the main oil channel 213 is connected to the first valve chamber 211. At the same time, it passes through the long oil pipe 15 to the upper chamber 111.

[0055] In the present application, the first oil port 2151 and the second oil port 2152 of the hydraulic cylinder are respectively connected to the hydraulic pump. The hydraulic pump drives the piston 12 in the hydraulic cylinder to move by delivering high-pressure oil to the hydraulic cylinder, thereby realizing various mechanical actions and control functions.

[0056] The extension and retraction process of the hydraulic cylinder includes extension transmission and compression transmission. The working process of the extension transmission is as follows: the extension transmission involves two oil inlet circuits and one oil return circuit. The first oil inlet circuit is: high-pressure oil enters the main oil channel 213 through the first oil port 2151, pushing the floating valve 22 to move to the side close to the first blocking block 24. At this time, the main oil channel 213 and the first valve chamber 211 are opened, and the high-pressure oil then enters the transmission oil circuit 214, and finally enters the lower chamber 112. The second oil inlet circuit is: high-pressure oil enters from the movable oil circuit 32, pushing the metal valve body 3121 in the third valve chamber 216 to move to the lower chamber 112 to open the movable oil circuit 32, and the high-pressure oil enters the lower chamber 112 and then pushes the piston rod 13 to extend upward.

[0057] At this time, the oil return path is: the upper chamber 111 is compressed, the compressed oil in the upper chamber 111 enters the second valve chamber 212 through the long oil pipe 15, and then returns to the hydraulic pump from the second oil port 2152.

[0058] The working process of the hydraulic cylinder compression transmission is as follows: the high-pressure oil output by the hydraulic pump enters from the second oil port 2152, and then reaches the upper chamber 111 through the long oil pipe 15. While entering from the second oil port 2152, the high-pressure oil will also push the hydraulic control valve 23 to move in the direction of the first blocking block 24, and then push the floating valve 22 to open through the push rod 232. The high-pressure oil entering the upper chamber 111 pushes the piston rod 13 to contract downward, and simultaneously causes the lower chamber 112 to be compressed, so that the original low-pressure oil inside the lower chamber 112 reaches the first oil port 2151 through the transmission oil path 214, and returns to the hydraulic pump through the first oil port 2151.

[0059] The working process of the hydraulic cylinder actuator is as follows: when the piston 12 is in the actuator state, the guide rod 3111 is adsorbed into a combination with the metal valve body 3121 through the strong magnet 2115, and the combination is subjected to the upward lifting force of the lower return spring 3113 and the downward compression force of the upper return spring 3112. After deducting the gravity and inertia force of the assembly itself from the combined force of the two, the remaining upward lifting force is still greater than the pre-compression force of the valve spring 3122, ensuring that the metal valve body 3121 is magnetically adsorbed with the strong magnet 3115 and moves toward the lower chamber 112, controlling the lower chamber 112 and the actuator oil circuit 32 to always remain connected.

[0060] The present application also discloses a vehicle equipped with the above-mentioned hydraulic cylinder. The vehicles mentioned here refer to heavy trucks, medium trucks, engineering vehicles, agricultural vehicles, and the like. By adding a new dynamic oil circuit 32 in the hydraulic cylinder, the decoupling and separation of the telescopic transmission and the dynamic connection is achieved. Specifically, by integrating a group of dynamic elimination devices 30 composed of components such as a strong magnet 3115 and a metal valve body 3121 in the hydraulic cylinder, active control of the opening and closing of the dynamic oil circuit 32 is achieved, and the wear of actuators such as the floating valve 22 and the hydraulic control valve 23 in the dynamic state due to frequent actions is avoided, which greatly reduces the output force of the hydraulic cylinder in the dynamic state and reduces the abnormal noise in the cab when the hydraulic cylinder is working.

[0061] In addition, since the control valve assembly 31 always keeps the lower chamber 112 connected to the dynamic oil circuit 32, it is no longer necessary to reduce the start threshold of the floating valve 22 due to the low hydraulic pressure of the oil in the dynamic state. Therefore, the start threshold of the floating valve 22 can be increased, improving the safety of the hydraulic cylinder during telescopic transmission.

[0062] When the vehicle is running, the piston 12 only reciprocates slightly in the moving area, which belongs to the moving up or down process. When the vehicle is overhauled, the piston rod 13 needs to be extended or contracted with a large stroke, and the piston 12 leaves the moving area. The movement stroke of the piston 12 in the cylinder body 11 is 500-700mm.

[0063] It should be noted that the technical solutions or technical features described in the above embodiments can be combined or supplemented with each other without causing conflicts. The scope of protection of this application is not limited to the precise structures described in the above embodiments and shown in the drawings; all modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of this application should be included in the scope of protection of this application.

Claims

1. A hydraulic cylinder, characterized in that: include: A cylinder assembly, a hydraulic valve assembly and a motion elimination device; the cylinder assembly includes a cylinder body, a piston and a piston rod, the piston forming an upper chamber and a lower chamber in the cylinder body; the hydraulic valve assembly is arranged at the lower part of the cylinder body and is provided with an oil port, a telescopic oil circuit is formed between the oil port, the upper chamber and the lower chamber; the motion elimination device includes a control valve assembly and a motion oil circuit, the motion oil circuit is arranged between the lower chamber and the oil port, and the control valve assembly is used to control the lower chamber and the motion oil circuit to always remain connected in the motion state.

2. The hydraulic cylinder according to claim 1, characterized in that: The control valve assembly includes a control mechanism and a one-way valve assembly. The control mechanism is arranged on the piston and the piston rod. The one-way valve assembly is arranged on the hydraulic valve assembly and is located between the lower chamber and the actuating oil circuit. In the actuating state, the control mechanism is adsorbed to the one-way valve assembly by magnetic attraction.

3. The hydraulic cylinder according to claim 2, characterized in that: The one-way valve assembly includes a metal valve body, a valve spring and a disc-shaped reed. The metal valve body includes a plug that can close the movable oil circuit and a rod connected to the plug. The valve spring is sleeved outside the rod, and the disc-shaped reed is fixed to the lower part of the lower chamber. The two ends of the valve spring respectively abut the plug and the disc-shaped reed, and the middle part of the disc-shaped reed is provided with a through hole through which the rod can extend.

4. The hydraulic cylinder according to claim 3, characterized in that: The control mechanism includes a guide rod, an upper return spring, a lower return spring, a guide seat and a strong magnet; the strong magnet is arranged at one end of the guide rod, and the other end of the guide rod is provided with a step portion, and the upper return spring and the lower return spring are respectively sleeved on both sides of the step portion; a long core hole is provided inside the piston rod, and part of the guide rod, the upper return spring and the lower return spring are blocked in the long core hole through the guide seat, and one end of the guide rod and the strong magnet protrude from the piston rod and are located in the lower cavity.

5. The hydraulic cylinder according to claim 4, characterized in that: In the actuating state, the upper return spring, the lower return spring and the strong magnet act together on the metal valve body to separate the plug of the metal valve body from the actuating oil circuit.

6. The hydraulic cylinder according to claim 1, characterized in that: The hydraulic valve assembly includes a valve block, a floating valve and a hydraulically controlled valve; the valve block is provided with a first valve chamber, a second valve chamber, a main oil channel, a transmission oil circuit and the oil port, and the oil port includes a first oil port and a second oil port; the floating valve is arranged in the first valve chamber, and a first blocking block is arranged on the outer side of the first valve chamber; the hydraulically controlled valve is arranged in the second valve chamber, and a second blocking block is arranged on the outer side of the second valve chamber; the main oil channel is arranged between the first valve chamber and the second valve chamber, and the transmission oil circuit is arranged between the first valve chamber and the lower chamber; the first oil port is connected with the main oil channel, and the second oil port is connected with the second valve chamber.

7. The hydraulic cylinder according to claim 6, characterized in that: The floating valve includes a floating valve core, a first spring is provided between the first blocking block and the floating valve core, and a branch oil channel is provided in the floating valve core; the branch oil channel includes a first branch oil channel, a second branch oil channel and an oil guide hole which are interconnected, the first branch oil channel and the second branch oil channel are respectively close to the first blocking block and the main oil channel, and the oil guide hole connects the second branch oil channel with the first valve cavity; a small ball, a slider, a second spring and a large ball are provided in the second branch oil channel, the small ball is used to control the opening and closing of the first branch oil channel and the second branch oil channel, and the large ball is used to control the opening and closing of the first valve cavity and the main oil channel.

8. The hydraulic cylinder according to claim 7, characterized in that: The hydraulic control valve includes a valve body and a push rod. One end of the valve body is provided with a protrusion smaller than the size of the second valve cavity. The other end of the valve body is connected to the push rod. The push rod extends from the second valve cavity and abuts against the large sphere.

9. The hydraulic cylinder according to claim 6, characterized in that: The valve block is provided with a third valve chamber, the third valve chamber is arranged between the actuating oil circuit and the lower chamber, and the control valve assembly is partially arranged in the third valve chamber.

10. The hydraulic cylinder according to claim 6, characterized in that: The dynamic oil circuit is connected to the first oil port; in the dynamic state, the opening of the dynamic oil circuit is greater than the opening of the transmission oil circuit.

11. The hydraulic cylinder according to claim 6, characterized in that: It also includes a short oil pipe and a long oil pipe, one end of the long oil pipe is connected to the upper cavity, and the other end of the long oil pipe is connected to the second valve cavity; one end of the short oil pipe is connected to the upper cavity, and the other end of the short oil pipe is connected to the first valve cavity.

12. A vehicle, characterized in that: A hydraulic cylinder comprising any one of claims 1 to 11.

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