Hydraulic oil cylinder

Abstract

The invention discloses a hydraulic oil cylinder which comprises a cylinder body, a piston and a shaft sleeve. The cylinder body is provided with a rod groove, a first pressure adjusting channel and a second pressure adjusting channel, the piston is slidably arranged in the rod groove, and the shaft sleeve is provided with a sleeve hole. The sleeve hole is provided with an oil sealing surface, the oil sealing surface is provided with a bearing oil groove, an oil drainage groove, a first groove body and a second groove body, the bearing oil groove is provided with a first feedback oil hole, the second groove body is provided with a second feedback oil hole, the first pressure regulating channel is communicated with the oil inlet groove, the first groove body is communicated with the oil inlet groove, and the second pressure regulating channel is communicated with the oil outlet groove. The oil drainage groove is communicated with the second pressure regulating channel; and in the two opposite oil sealing surfaces, one end of the feedback oil groove is communicated with the bearing oil groove of one oil sealing surface through the first feedback oil hole of the oil sealing surface, and the other end of the feedback oil groove is communicated with the second groove body of the oil sealing surface through the second feedback oil hole of the other oil sealing surface. The hydraulic oil cylinder can improve the radial bearing capacity of the piston and prolong the service life of the hydraulic oil cylinder.

Description

Technical Field

[0001] The present invention relates to the technical field of fluid pressure actuators, and in particular to a hydraulic cylinder. Background Art

[0002] As a power actuator widely used in modern industry, the reliability of the performance of a hydraulic cylinder directly affects the operating efficiency and service life of the entire hydraulic system. In existing hydraulic cylinders, the radial support of the piston mostly relies on direct contact between solids, resulting in poor radial load-bearing capacity of the piston. When the overhanging length of the piston is relatively long, it is prone to deflection, which will not only cause wear of the piston but also lead to liquid leakage problems in the hydraulic cylinder, affecting the service life of the hydraulic cylinder. Summary of the Invention

[0003] The purpose of the embodiments of the present invention is to provide a hydraulic cylinder that can improve the radial load-bearing capacity of the piston, reduce the risk of piston wear, and extend the service life.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A hydraulic cylinder, comprising:

[0006] A cylinder block having a rod groove, a first pressure regulating channel, and a second pressure regulating channel;

[0007] A piston, at least partially sliding in the rod groove;

[0008] A bushing provided with a sleeve hole; the bushing is disposed in the rod groove and sleeved on the piston through the sleeve hole;

[0009] An oil inlet groove and a plurality of feedback oil grooves are provided on the outer side surface of the bushing. A plurality of oil sealing surfaces are provided on the inner wall of the sleeve hole and arranged in sequence along the circumferential direction of the piston. A plurality of the oil sealing surfaces are arranged in pairs. Each oil sealing surface is provided with a load-bearing oil groove, an oil drain groove, a first groove body, and a second groove body. A first feedback oil hole is provided on the inner wall of the load-bearing oil groove, an oil drain hole is provided on the inner wall of the oil drain groove, an oil inlet hole is provided on the first groove body, and a second feedback oil hole is provided on the second groove body. The first pressure regulating channel is communicated with the oil inlet groove, the first groove body is communicated with the oil inlet groove through the oil inlet hole, and the oil drain groove is communicated with the second pressure regulating channel through the oil drain hole;

[0010] In any two relatively opposite oil sealing surfaces, one end of the feedback oil groove is communicated with the load-bearing oil groove on one of the oil sealing surfaces through the first feedback oil hole on the oil sealing surface, and the other end of the feedback oil groove is communicated with the second groove body on the other oil sealing surface through the second feedback oil hole on the other oil sealing surface.

[0011] Optionally, the bearing oil groove is disposed around the first groove body and the second groove body. Both the first groove body and the second groove body extend along the circumferential direction of the piston. There are two second groove bodies which are arranged at intervals along the sliding direction of the piston. The first groove body is located between the two second groove bodies.

[0012] Optionally, the feedback oil groove has a first groove section and a second groove section which are connected in sequence. The first groove section extends along the sliding direction of the piston. The second groove section extends along the circumferential direction of the piston. There are multiple first groove sections and second groove sections which are arranged alternately.

[0013] Optionally, the hydraulic cylinder further includes a first plug and a second plug. The cylinder body has a rotary structure. The cylinder body is provided with a communication oil passage which is arranged on the end face of the cylinder body and extends along the axial direction of the cylinder body. There are two second pressure regulating channels which are arranged at intervals along the axial direction of the cylinder body. Both of the two second pressure regulating channels are arranged on the outer circumferential side of the cylinder body and extend along the radial direction of the cylinder body. The two second pressure regulating channels are communicated with each other through the communication oil passage. There are two oil discharge grooves which are arranged at intervals along the sliding direction of the piston. The two second pressure regulating channels correspond to the two oil discharge grooves one by one. The oil sealing surface is located between the two oil discharge grooves. The first plug is arranged on the end face of the cylinder body to block the passage opening of the communication oil passage. The second plug is arranged on the outer circumferential side of the cylinder body to block the passage opening of one of the second pressure regulating channels.

[0014] Optionally, the hydraulic cylinder further includes a first pressure regulating joint and a second pressure regulating joint. The first pressure regulating joint is installed on the cylinder body and communicated with the first pressure regulating channel. The second pressure regulating joint is installed on the cylinder body and communicated with one of the second pressure regulating channels.

[0015] Optionally, the cylinder body further has an oil cavity, a first oil inlet / outlet passage, and a second oil inlet / outlet passage. The oil cavity is communicated with the outside of the cylinder body through the rod groove, the first oil inlet / outlet passage, and the second oil inlet / outlet passage. The piston has a plug portion and a rod portion connected to the plug portion. The plug portion slides in the oil cavity and is located between the first oil inlet / outlet passage and the second oil inlet / outlet passage. The rod portion slides in the rod groove. The shaft sleeve is sleeved on the rod portion through the sleeve hole.

[0016] Optionally, the hydraulic cylinder further includes a first damper and a second damper; the cylinder body includes a cylinder barrel, a first cover body, and a second cover body; the first cover body is installed at one end of the cylinder barrel, the second cover body is installed at the other end of the cylinder barrel, the first damper is installed on the plug portion of the piston, the second damper is installed on the second cover body and is located in the oil cavity, and the first cover body, the shaft sleeve, the first damper, the plug portion of the piston, the second damper, and the second cover body are arranged in sequence along the sliding direction of the piston.

[0017] Optionally, the hydraulic cylinder further includes a first sealing ring, a second sealing ring, a third sealing ring, a fourth sealing ring, a fifth sealing ring, a sixth sealing ring, and a dust ring;

[0018] Both the first sealing ring and the dust ring are clamped between the first cover body and the rod portion and are arranged at intervals along the direction away from the shaft sleeve, the second sealing ring is clamped between the first cover body and the cylinder barrel, the third sealing ring is clamped between the cylinder barrel and the shaft sleeve, the fourth sealing ring is clamped between the shaft sleeve and the rod portion of the piston, the fifth sealing ring is clamped between the inner wall of the oil cavity and the plug portion of the piston, and the sixth sealing ring is clamped between the second cover body and the inner wall of the oil cavity.

[0019] Optionally, the hydraulic cylinder further includes a first oil inlet / outlet joint and a second oil inlet / outlet joint; the first oil inlet / outlet joint is installed on the cylinder body and communicates with the first oil inlet / outlet channel, and the second oil inlet / outlet joint is installed on the cylinder body and communicates with the second oil inlet / outlet channel.

[0020] Optionally, one end of the piston passes through the rod groove and slides in the cylinder body, and the other end of the piston is located outside the cylinder body and is provided with a spherical plain bearing.

[0021] The beneficial effects of the present invention are as follows: This hydraulic cylinder does not require additional throttling devices such as throttlers, is convenient for assembly and debugging, has no risk of small hole blockage and hydrostatic bearing failure, and simplifies the assembly and debugging process. By arranging a shaft sleeve sleeved on the piston, when the piston bears a large radial load, the liquid flows through the first pressure regulating channel, the second pressure regulating channel on the cylinder body, the oil inlet groove, the feedback oil groove, the load-bearing oil groove, and the oil drain groove of the shaft sleeve to balance the radial external load, realizing liquid lubrication and radial pressure compensation. Not only does the piston run more smoothly, but also the radial load-bearing capacity of the piston is improved, so that the piston of the hydraulic cylinder will not be worn during long-term use, avoiding liquid leakage of the hydraulic cylinder and improving the service life of the hydraulic cylinder. Description of the Drawings

[0022] The present invention will be further described in detail below with reference to the drawings and embodiments.

[0023] Figure 1 It is a schematic structural diagram of a hydraulic cylinder;

[0024] Figure 2 It is an exploded view of the hydraulic cylinder;

[0025] Figure 3 It is a side view of the hydraulic cylinder;

[0026] Figure 4 It is Figure 3 a sectional view taken along the A-A line of

[0027] Figure 5 It is Figure 3 a sectional view taken along the B-B line of

[0028] Figure 6 It is a schematic structural diagram of a bushing;

[0029] Figure 7 It is a partial sectional view of the bushing;

[0030] Figure 8 It is the front view of the bushing;

[0031] Figure 9 It is a half-sectional view of the bushing;

[0032] Figure 10 It is the working principle diagram of two relatively arranged oil sealing surfaces of the bushing.

[0033] Explanation of reference numerals in the drawings: In the figures:

[0034] 11, cylinder block; 12, piston; 13, bushing; 14, first plug; 15, second plug; 16, first pressure regulating joint; 17, second pressure regulating joint; 18, first damper; 19, second damper; 20, first sealing ring; 21, second sealing ring; 22, third sealing ring; 23, fourth sealing ring; 24, fifth sealing ring; 25, sixth sealing ring; 26, dust ring; 27, first oil inlet / outlet joint; 28, second oil inlet / outlet joint; 29, spherical plain bearing;

[0035] 1101, cylinder barrel; 1102, first cover body; 1103, second cover body; 1104, rod groove; 1105, first pressure regulating channel; 1106, second pressure regulating channel; 1107, connecting oil channel; 1108, oil cavity; 1109, first oil inlet / outlet channel; 1110, second oil inlet / outlet channel;

[0036] 1201, plug part; 1202, rod part;

[0037] 1301. Sleeve hole; 1302. Oil inlet groove; 1303. Feedback oil groove; 1304. Oil sealing surface; 1305. Bearing oil groove; 1306. Oil drain groove; 1307. First tank body; 1308. Second tank body; 1309. First feedback oil hole; 1310. Second feedback oil hole; 1311. Oil drain hole; 1312. Oil inlet hole. Detailed implementation mode

[0038] To make the technical problems solved by the present invention, the technical solutions adopted and the achieved technical effects clearer, the technical solutions of the embodiments of the present invention will be further described in detail below with reference to the drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present invention.

[0039] In the description of the present invention, unless otherwise clearly defined and limited, terms such as "connected", "fixed", "connected", "communicated", "abutted", "clamped" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0040] In the present invention, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "over" and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "under" and "beneath" the second feature includes the first feature being directly below and obliquely below the second feature, or simply indicating that the horizontal height of the first feature is lower than that of the second feature.

[0041] In the description herein, it should be understood that the orientation or positional relationships such as "above", "below", "left", "right", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for distinction in description and have no special meanings.

[0042] In the description of this specification, the descriptions referring to terms such as "an embodiment" and "example" mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example.

[0043] In addition, it should be understood that although this specification is described in terms of embodiments, not every embodiment only includes an independent technical solution. This narrative manner of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0044] Unless otherwise specified or defined, the term "and / or" used in the present invention includes any and all combinations of one or more of the related listed items.

[0045] For the convenience of narration, unless otherwise stated, the up and down directions mentioned below are the same as Figure 10 the up and down directions of itself.

[0046] As Figures 1 to 10 shown, this embodiment provides a hydraulic cylinder, including a cylinder block 11, a piston 12, and a bushing 13. The piston 12 is the output end of the hydraulic cylinder and is a component that can convert hydraulic energy into mechanical energy of linear motion. By injecting hydraulic oil into the cylinder block 11 and changing the flow direction of the liquid, the reciprocating linear motion of the piston 12 in the cylinder block 11 is realized. This driving method is the prior art and will not be elaborated here. The bushing 13 is used to sleeve on the piston 12 and utilizes the oil pressure to improve the radial load-bearing capacity of the piston 12.

[0047] The cylinder block 11 has a rod groove 1104, a first pressure regulating channel 1105, and a second pressure regulating channel 1106. The rod groove 1104 is communicated with the outside of the cylinder block 11 through the first pressure regulating channel 1105, and the rod groove 1104 is communicated with the outside of the cylinder block 11 through the second pressure regulating channel 1106. At least a part of the piston 12 is slidably arranged in the rod groove 1104, that is, one end of the piston 12 is slidably arranged in the cylinder block 11, and the other end of the piston 12 passes through the rod groove 1104 and extends to the outside of the cylinder block 11. The bushing 13 is provided with a sleeve hole 1301. The bushing 13 is arranged in the rod groove 1104 and is sleeved on the piston 12 through the sleeve hole 1301. One end of the piston 12 close to the outside of the cylinder block 11 is more easily affected by the radial force, and the bushing 13 is close to one end of the piston 12 close to the outside of the cylinder block 11.

[0048] Liquid is injected into the bushing 13 through the first pressure regulating channel 1105, and the liquid flows circumferentially along the piston 12 and then flows out from the second pressure regulating channel 1106 to achieve circulation, so that the bushing 13 can cooperate with the piston 12 to form a hydrostatic bearing, enhancing the radial load-bearing capacity of the piston 12.

[0049] The bushing 13 is tubular, and the bushing 13 is a self-compensating radial bushing 13. An oil inlet groove 1302 and a plurality of feedback oil grooves 1303 are provided on the outer side surface of the bushing 13. The oil inlet groove 1302 includes an annular groove extending along the circumferential direction of the bushing 13 and a plurality of strip-shaped grooves all extending along the circumferential direction of the bushing 13. The plurality of strip-shaped grooves are arranged at intervals along the circumferential direction of the bushing 13 and are all communicated with the annular groove.

[0050] A plurality of oil sealing surfaces 1304 arranged in sequence along the circumferential direction of the piston 12 are provided on the inner wall of the sleeve hole 1301. Each oil sealing surface 1304 is an arc surface, and the plurality of oil sealing surfaces 1304 are sequentially connected to form the circular inner wall of the sleeve hole 1301. The plurality of oil sealing surfaces 1304 are arranged in pairs opposite to each other, that is, two oil sealing surfaces 1304 on the same diameter of the bushing 13 are arranged opposite to each other, and the two opposite oil sealing surfaces 1304 jointly clamp the piston 12.

[0051] Each oil sealing surface 1304 is provided with a load-bearing oil groove 1305, an oil drain groove 1306, a first groove body 1307, and a second groove body 1308. After the oil sealing surface 1304 abuts against the outer circumferential side surface of the piston 12, the openings of the load-bearing oil groove 1305, the oil drain groove 1306, the first groove body 1307, and the second groove body 1308 are covered, so that the load-bearing oil groove 1305, the oil drain groove 1306, the first groove body 1307, and the second groove body 1308 can all accommodate a certain amount of liquid. The oil drain grooves 1306 on all the oil sealing surfaces 1304 are sequentially communicated to form an annular groove. A first feedback oil hole 1309 is provided on the inner wall of the load-bearing oil groove 1305, at least one oil drain hole 1311 is provided on the inner wall of at least part of the oil drain groove 1306, an oil inlet hole 1312 is provided on the first groove body 1307, and the plurality of oil inlet holes 1312 correspond to the plurality of strip-shaped grooves of the oil inlet groove 1302 one by one. A second feedback oil hole 1310 is provided on the second groove body 1308, and the oil inlet hole 1312, the first feedback oil hole 1309, and the second feedback oil hole 1310 all extend along the radial direction of the bushing 13. The first pressure regulating channel 1105 is communicated with the oil inlet groove 1302, the first groove body 1307 is communicated with the oil inlet groove 1302 through the oil inlet hole 1312, and the oil drain groove 1306 is communicated with the second pressure regulating channel 1106 through the oil drain hole 1311.

[0052] In any two opposite oil sealing surfaces 1304, one end of the feedback oil groove 1303 communicates with the bearing oil groove 1305 on one of the oil sealing surfaces 1304 through the first feedback oil hole 1309 on this oil sealing surface 1304, and the other end of the feedback oil groove 1303 communicates with the second groove body 1308 on the other oil sealing surface 1304 through the second feedback oil hole 1310 on this oil sealing surface 1304. Thus, when a liquid such as liquid oil is input into the first pressure regulating channel 1105, the liquid oil enters the first groove body 1307 in the sleeve hole 1301 from each oil inlet hole 1312 after passing through the oil inlet groove 1302, and then the liquid oil diffuses into the second groove body 1308 in the gap between the sleeve 13 and the piston 12. The liquid oil in the second groove body 1308 of any oil sealing surface 1304 can flow from the second feedback oil hole 1310 of this oil sealing surface 1304 to the feedback oil groove 1303 on the outer circumferential side surface of the sleeve 13, and then flow along the feedback oil groove 1303, and finally flow from the first feedback oil hole 1309 to the bearing oil groove 1305 on the oil sealing surface 1304 opposite to this oil sealing surface 1304. The liquid oil in the bearing oil groove 1305 flows into the oil drain groove 1306 from the gap between the sleeve 13 and the piston 12, and finally flows back to the second pressure regulating channel 1106 through the oil drain hole 1311, realizing the circulation of the liquid oil.

[0053] The liquid oil throttles after entering the bearing from the oil inlet hole 1312. The main function of the feedback oil groove 1303 is to enable the throttled liquid oil on one of the oil sealing surfaces 1304 to enter the bearing oil groove 1305 of the opposite oil sealing surface 1304 through the feedback oil groove 1303, and finally the liquid oil flows out through the oil drain grooves 1306 on both sides of the oil sealing surface and flows back to the fuel tank through the second pressure regulating channel 1106.

[0054] In the flow field of the sleeve 13 of this application, the flow rate, flow resistance, and pressure drop of the liquid can be analogized to the current, resistance, and voltage of an electric circuit. Refer to Figure 8, the principle of the present application for balancing the radial load of the balance piston 12 is as follows: Two oil sealing surfaces 1304 are arranged opposite to each other vertically. When the piston 12 is subjected to a radial load and moves downward relative to the axis of the sleeve 13, the upper oil film gap between the piston 12 and the upper oil sealing surface 1304 increases, and the lower oil film gap between the piston 12 and the lower oil sealing surface 1304 decreases. Therefore, the throttling flow resistance of the upper oil film gap decreases, and the throttling flow resistance of the lower oil film gap increases. Since the liquid oil after throttling in the upper oil film gap can flow from the second feedback oil hole 1310 on the upper oil sealing surface 1304 above to the feedback oil groove 1303 outside the sleeve 13, and finally from the feedback oil groove 1303 and through the load-bearing oil groove 1305 on the lower oil sealing surface 1304 below, and the liquid oil after throttling in the lower oil film gap can flow from the second feedback oil hole 1310 on the lower oil sealing surface 1304 below to the feedback oil groove 1303 outside the sleeve 13, and finally from the feedback oil groove 1303 and through the load-bearing oil groove 1305 on the upper oil sealing surface 1304 above, the flow resistance of the upper oil sealing surface 1304 decreases, and the flow resistance of the lower oil sealing surface 1304 increases, which will cause the pressure in the upper oil film gap to decrease and the pressure in the lower oil film gap to increase. Eventually, the resultant force of the liquid inside the sleeve 13 is upward, balancing the radial external load of the balance piston 12.

[0055] Compared with ordinary hydraulic cylinders, the hydraulic cylinder of the present application is supported by a self-compensating hydrostatic radial sleeve 13. By introducing externally pressurized liquid oil into the load-bearing oil groove 1305 of the sleeve 13, the piston 12 is lifted, enabling the piston 12 to have the advantages of high bearing capacity, large radial stiffness, smooth movement, and long service life. The sleeve 13 of the present application is supported by a common orifice throttling bearing compared with existing hydraulic cylinders. The biggest feature is that there is no need for an external throttle. The gap between the inner and outer cylindrical surfaces of the piston 12 and the sleeve 13 of the present application plays a throttling role. At the same time, the sleeve 13 has an internal feedback effect, making it have a higher stiffness than the common orifice throttling method. Since the sleeve 13 of the present application does not need to be provided with an orifice throttle, there will be no situation where the orifice of the throttle is blocked by pollutants, nor is there a risk of hydrostatic bearing failure, and the assembly and debugging are more convenient.

[0056] Reference Figures 6 to 10 , in one embodiment, the load-bearing oil groove 1305 is annularly arranged on the first groove body 1307 and the second groove body 1308. Both the first groove body 1307 and the second groove body 1308 extend along the circumferential direction of the piston 12. There are two second groove bodies 1308 and they are arranged at intervals along the sliding direction of the piston 12, that is, the two second groove bodies 1308 are arranged at intervals along the axial direction of the sleeve 13. The first groove body 1307 is located between the two second groove bodies 1308.

[0057] When the hydraulic oil enters the oil inlet groove 1302 of the bushing 13 from the first pressure regulating channel 1105, the hydraulic oil enters the first tank 1307 of each oil sealing surface 1304 through the oil inlet hole 1312. Then, the hydraulic oil first flows axially along the bushing 13 to the two second tanks 1308, and then flows from the second feedback oil holes 1310 on the two second tanks 1308 to the feedback oil groove 1303, so that the hydraulic oil entering from the oil inlet hole 1312 on each oil sealing surface 1304 can flow through the feedback oil groove 1303 into the load-bearing oil groove 1305 on the opposite oil sealing surface 1304, enabling the hydraulic oil to balance the radial load of the piston 12 when the radial load of the piston 12 changes.

[0058] The contact between the bushing 13 and the piston 12 in this application is liquid lubrication. At the same time, liquid friction is used to avoid direct solid contact between the bushing 13 and the piston 12, so that there is no wear when the piston 12 moves for a long time. The piston 12 runs more smoothly during the loading operation and has a longer service life. By using the radial self-compensation function of the bushing 13, the radial load-bearing capacity and stiffness of the bearing are improved, enabling the bearing to have a large radial bearing capacity and radial stiffness, so that the piston 12 will not be skewed when the overhang length is long, and the possibility of internal leakage in the hydraulic cylinder is eliminated.

[0059] Optionally, the feedback oil groove 1303 has a first tank section and a second tank section that are connected in sequence. The first tank section extends along the sliding direction of the piston 12, and the second tank section extends along the circumferential direction of the piston 12. There are multiple first tank sections and second tank sections, which are arranged alternately. The feedback oil groove 1303 extends along a stepped trajectory, which means that the feedback oil groove 1303 extends alternately between the circumferential trajectory of the bushing 13 and the axial trajectory of the bushing 13, so that the feedback oil groove 1303 can adjust the oil pressure on the two relatively arranged oil sealing surfaces 1304, thereby balancing the radial load of the piston 12.

[0060] Furthermore, there are two oil drain grooves 1306 on each oil sealing surface 1304. The two oil drain grooves 1306 are arranged at intervals along the axial direction of the bushing 13, and the load-bearing oil groove 1305 is located between the two oil drain grooves 1306.

[0061] Reference Figures 1 to 4, Further, the hydraulic cylinder further includes a first plug 14 and a second plug 15. In this application, oil drain grooves 1306 are provided at both axial ends of the bushing 13. Therefore, two second pressure regulating channels 1106 need to be provided on the cylinder block 11. The cylinder block 11 has a rotary structure, and the cylinder block 11 is provided with a communicating oil passage 1107. The communicating oil passage 1107 is provided on the end face of the cylinder block 11 and extends along the axial direction of the cylinder block 11. Two second pressure regulating channels 1106 are arranged at intervals along the axial direction of the cylinder block 11. Both of the two second pressure regulating channels 1106 are provided on the outer circumferential side of the cylinder block 11 and extend along the radial direction of the cylinder block 11. The two second pressure regulating channels 1106 are communicated with each other through the communicating oil passage 1107. There are two oil drain grooves 1306 arranged at intervals along the sliding direction of the piston 12. The two second pressure regulating channels 1106 correspond to the two oil drain grooves 1306 one by one. The oil sealing surface 1304 is located between the two oil drain grooves 1306. The first plug 14 is provided on the end face of the cylinder block 11 to block the passage opening of the communicating oil passage 1107. The second plug 15 is provided on the outer circumferential side of the cylinder block 11 to block the passage opening of one of the second pressure regulating channels 1106. By providing the communicating oil passage 1107, the oil drain grooves 1306 at both axial ends of the bushing 13 are communicated with each other, so that only one of the two second pressure regulating channels 1106 needs to be externally connected to an external pipeline, reducing the layout of joints and external pipelines. Since the communicating oil passage 1107 needs to communicate the two second pressure regulating channels 1106 along the axial direction of the bushing 13, based on the processing requirements of the communicating oil passage 1107 and the two second pressure regulating channels 1106, one end of the communicating oil passage 1107 will form an opening on the end face of the bushing 13, and the two second pressure regulating channels 1106 will form openings on the outer circumferential surface of the bushing 13. Therefore, by providing the first plug 14 on the end face of the bushing 13 and the second plug 15 on the outer circumferential surface of the bushing 13, the anti-leakage effect of the communicating oil passage 1107 and the two second pressure regulating channels 1106 is realized.

[0062] In one embodiment, the hydraulic cylinder further includes a first pressure regulating joint 16 and a second pressure regulating joint 17. The first pressure regulating joint 16 is installed on the cylinder block 11 and communicated with the first pressure regulating channel 1105. The second pressure regulating joint 17 is installed on the cylinder block 11 and communicated with one of the second pressure regulating channels 1106. Both the first pressure regulating joint 16 and the second pressure regulating joint 17 are transition joints between the hydraulic cylinder and the externally connected liquid oil pipeline, so as to realize the cyclic transportation of the liquid oil to the bushing 13.

[0063] Further, the cylinder block 11 further has an oil chamber 1108, a first oil inlet / outlet passage 1109, and a second oil inlet / outlet passage 1110. The oil chamber 1108 communicates with the outside of the cylinder block 11 through the rod groove 1104, the first oil inlet / outlet passage 1109, and the second oil inlet / outlet passage 1110. The piston 12 has a plug portion 1201 and a rod portion 1202 connected to the plug portion 1201. The plug portion 1201 is slidably disposed in the oil chamber 1108 and is located between the first oil inlet / outlet passage 1109 and the second oil inlet / outlet passage 1110. The rod portion 1202 is slidably disposed in the rod groove 1104. The sleeve 13 is sleeved on the rod portion 1202 through the sleeve hole 1301. The cross-section of the piston 12 is larger than that of the rod portion 1202. One end of the rod portion 1202 is connected to the plug portion 1201, and the other end of the rod portion 1202 passes through the sleeve 13 and extends outside the cylinder block 11. By changing the flow direction of the hydraulic oil through the first oil inlet / outlet passage 1109 and the second oil inlet / outlet passage 1110, the piston 12 reciprocates.

[0064] In one embodiment, the hydraulic cylinder further includes a first damper 18 and a second damper 19. The cylinder block 11 includes a cylinder barrel 1101, a first cover 1102, and a second cover 1103. The first cover 1102 may be integrally formed with the sleeve 13. The first cover 1102 is installed at one end of the cylinder barrel 1101, the second cover 1103 is installed at the other end of the cylinder barrel 1101. The first damper 18 is installed on the plug portion 1201 of the piston 12. The second damper 19 is installed on the second cover 1103 and is located in the oil chamber 1108. The first cover 1102, the sleeve 13, the first damper 18, the plug portion 1201 of the piston 12, the second damper 19, and the second cover 1103 are arranged in sequence along the sliding direction of the piston 12. The first cover 1102, the second cover 1103, the piston 12, and the cylinder barrel 1101 together form a sealed oil chamber 1108 to accommodate the hydraulic oil and realize the reciprocating movement of the piston 12. The first damper 18 and the second damper 19 mainly play a role in limiting and buffering.

[0065] Optionally, the hydraulic cylinder further includes a first sealing ring 20, a second sealing ring 21, a third sealing ring 22, a fourth sealing ring 23, a fifth sealing ring 24, a sixth sealing ring 25, and a dust ring 26. The first sealing ring 20, the second sealing ring 21, the third sealing ring 22, the fourth sealing ring 23, the fifth sealing ring 24, and the sixth sealing ring 25 prevent the leakage of the hydraulic oil in the hydraulic cylinder, and the dust ring 26 prevents dust from entering the inside of the hydraulic cylinder.

[0066] The first sealing ring 20 and the dust-proof ring 26 are both clamped between the first cover 1102 and the rod portion 1202 and are arranged at intervals along the direction away from the shaft sleeve 13. The dust-proof ring 26 is closer to the outside of the cylinder block 11 than the first sealing ring 20. The second sealing ring 21 is clamped between the first cover 1102 and the cylinder barrel 1101, the third sealing ring 22 is clamped between the cylinder barrel 1101 and the shaft sleeve 13, the fourth sealing ring 23 is clamped between the shaft sleeve 13 and the rod portion 1202 of the piston 12, and the fifth sealing ring 24 is clamped between the inner wall of the oil cavity 1108 and the plug portion 1201 of the piston 12. The fifth sealing ring 24 is installed on the plug portion 1201 of the piston 12. The fifth sealing ring 24 divides both sides of the plug portion 1201 of the piston 12 into two chambers. By injecting liquid into one chamber and extracting liquid from the other chamber, the reciprocating linear motion of the piston 12 is realized. The sixth sealing ring 25 is clamped between the second cover 1103 and the inner wall of the oil cavity 1108. The first sealing ring 20, the second sealing ring 21, the third sealing ring 22, the fourth sealing ring 23, the fifth sealing ring 24, the sixth sealing ring 25, and the dust-proof ring 26 together constitute the sealing system of the hydraulic cylinder to prevent the leakage of hydraulic oil and the entry of dust into the inside of the cylinder block 11.

[0067] In one embodiment, the hydraulic cylinder further includes a first oil inlet / outlet joint 27 and a second oil inlet / outlet joint 28. Both the first oil inlet / outlet joint 27 and the second oil inlet / outlet joint 28 are transition joints between the hydraulic cylinder and the pipeline connected thereto and are both used to connect the external liquid oil pipeline to realize the circulating transportation of the liquid oil. The first oil inlet / outlet joint 27 is installed on the cylinder block 11 and is communicated with the first oil inlet / outlet channel 1109, and the second oil inlet / outlet joint 28 is installed on the cylinder block 11 and is communicated with the second oil inlet / outlet channel 1110. By changing the flow direction of the liquid oil, the piston 12 reciprocates. That is, when the liquid oil enters from the first oil inlet / outlet joint 27, the liquid oil flows out from the second oil inlet / outlet joint 28, and when the liquid oil enters from the second oil inlet / outlet joint 28, the liquid oil flows out from the first oil inlet / outlet joint 27.

[0068] Furthermore, the cylinder block 11 is in a cylindrical shape. The first oil inlet / outlet joint 27, the second oil inlet / outlet joint 28, and the first pressure regulating joint 16 are located on the same generatrix of the cylinder block 11. The first pressure regulating joint 16 and the second pressure regulating joint 17 are on different generatrices of the cylinder block 11 respectively, which avoids easy misconnection when the hydraulic cylinder is connected to the liquid oil and also makes the flow of the liquid oil on the shaft body more sufficient.

[0069] Optionally, one end of the piston 12 passes through the rod groove 1104 and slides in the cylinder block 11, and the other end of the piston 12 is located outside the cylinder block 11 and is provided with a spherical plain bearing 29. The spherical plain bearing 29 is installed at one end of the piston 12 located outside the cylinder block 11. The spherical plain bearing 29 is used to connect the components that need to be driven by the hydraulic cylinder to increase the degree of freedom of the hydraulic cylinder.

[0070] The technical principles of the present invention have been described in connection with specific embodiments. These descriptions are only for explaining the principles of the present invention and cannot be construed in any way as limiting the protection scope of the present invention. Based on the explanations herein, those skilled in the art can readily conceive of other specific embodiments of the present invention without creative efforts, and these embodiments will fall within the protection scope of the present invention.

Claims

1. A hydraulic cylinder, characterized in that, Comprising: A cylinder block (11) having a rod groove (1104), a first pressure regulating passage (1105), and a second pressure regulating passage (1106); A piston (12) at least partially sliding in the rod groove (1104); A bushing (13) provided with a bush hole (1301); the bushing (13) is disposed in the rod groove (1104) and sleeved on the piston (12) through the bush hole (1301); An oil inlet groove (1302) and a plurality of feedback oil grooves (1303) are provided on the outer side surface of the bushing (13), and a plurality of oil sealing surfaces (1304) arranged in sequence along the circumference of the piston (12) are provided on the inner wall of the bush hole (1301). The plurality of oil sealing surfaces (1304) are arranged in pairs opposite to each other. The oil sealing surface (1304) is provided with a load oil groove (1305), an oil drain groove (1306), a first groove body (1307), and a second groove body (1308). A first feedback oil hole (1309) is provided on the inner wall of the load oil groove (1305), an oil drain hole (1311) is provided on the inner wall of the oil drain groove (1306), an oil inlet hole (1312) is provided on the first groove body (1307), and a second feedback oil hole (1310) is provided on the second groove body (1308). The first pressure regulating passage (1105) is communicated with the oil inlet groove (1302), the first groove body (1307) is communicated with the oil inlet groove (1302) through the oil inlet hole (1312), and the oil drain groove (1306) is communicated with the second pressure regulating passage (1106) through the oil drain hole (1311); In any two relatively opposite oil sealing surfaces (1304), one end of the feedback oil groove (1303) is communicated with the load oil groove (1305) on one of the oil sealing surfaces (1304) through the first feedback oil hole (1309) on the oil sealing surface (1304), and the other end of the feedback oil groove (1303) is communicated with the second groove body (1308) on the other oil sealing surface (1304) through the second feedback oil hole (1310) on the oil sealing surface (1304).

2. The hydraulic cylinder according to claim 1, characterized in that, The load oil groove (1305) is annularly arranged around the first groove body (1307) and the second groove body (1308). Both the first groove body (1307) and the second groove body (1308) extend along the circumference of the piston (12). There are two second groove bodies (1308) and they are arranged at intervals along the sliding direction of the piston (12). The first groove body (1307) is located between the two second groove bodies (1308).

3. The hydraulic cylinder according to any one of claims 1 to 2, characterized in that The feedback oil groove (1303) has a first groove section and a second groove section that are sequentially communicated; the first groove section extends along the sliding direction of the piston (12), the second groove section extends along the circumference of the piston (12), and there are a plurality of both the first groove section and the second groove section and they are alternately arranged.

4. The hydraulic cylinder according to any one of claims 1 to 2, characterized in that, It further includes a first plug (14) and a second plug (15); the cylinder block (11) has a rotary structure, the cylinder block (11) is provided with a communicating oil passage (1107), the communicating oil passage (1107) is arranged on the end face of the cylinder block (11) and extends along the axial direction of the cylinder block (11), there are two second pressure regulating channels (1106) arranged at intervals along the axial direction of the cylinder block (11), both of the two second pressure regulating channels (1106) are arranged on the outer circumferential side surface of the cylinder block (11) and extend along the radial direction of the cylinder block (11), the two second pressure regulating channels (1106) are communicated with each other through the communicating oil passage (1107), there are two oil drain grooves (1306) arranged at intervals along the sliding direction of the piston (12), the two second pressure regulating channels (1106) correspond to the two oil drain grooves (1306) one by one, the oil sealing surface (1304) is located between the two oil drain grooves (1306), the first plug (14) is arranged on the end face of the cylinder block (11) and blocks the passage opening of the communicating oil passage (1107), and the second plug (15) is arranged on the outer circumferential side surface of the cylinder block (11) and blocks the passage opening of one of the second pressure regulating channels (1106).

5. The hydraulic cylinder according to claim 4, wherein, It further includes a first pressure regulating joint (16) and a second pressure regulating joint (17); the first pressure regulating joint (16) is installed on the cylinder block (11) and communicated with the first pressure regulating channel (1105), and the second pressure regulating joint (17) is installed on the cylinder block (11) and communicated with one of the second pressure regulating channels (1106).

6. The hydraulic cylinder according to any one of claims 1 to 2, characterized in that, The cylinder block (11) further has an oil cavity (1108), a first oil inlet / outlet passage (1109), and a second oil inlet / outlet passage (1110); the oil cavity (1108) is communicated with the outside of the cylinder block (11) through the rod groove (1104), the first oil inlet / outlet passage (1109), and the second oil inlet / outlet passage (1110), the piston (12) has a plug portion (1201) and a rod portion (1202) connected to the plug portion (1201), the plug portion (1201) slides in the oil cavity (1108) and is located between the first oil inlet / outlet passage (1109) and the second oil inlet / outlet passage (1110), the rod portion (1202) slides in the rod groove (1104), and the shaft sleeve (13) is sleeved on the rod portion (1202) through the sleeve hole (1301).

7. The hydraulic cylinder according to claim 6, wherein It further includes a first damper (18) and a second damper (19); the cylinder block (11) includes a cylinder barrel (1101), a first cover body (1102), and a second cover body (1103); the first cover body (1102) is installed at one end of the cylinder barrel (1101), the second cover body (1103) is installed at the other end of the cylinder barrel (1101), the first damper (18) is installed on the plug portion (1201) of the piston (12), the second damper (19) is installed on the second cover body (1103) and is located in the oil chamber (1108), and the first cover body (1102), the shaft sleeve (13), the first damper (18), the plug portion (1201) of the piston (12), the second damper (19), and the second cover body (1103) are arranged in sequence along the sliding direction of the piston (12).

8. The hydraulic cylinder according to claim 7, wherein, It further includes a first sealing ring (20), a second sealing ring (21), a third sealing ring (22), a fourth sealing ring (23), a fifth sealing ring (24), a sixth sealing ring (25), and a dust ring (26); The first sealing ring (20) and the dust ring (26) are both clamped between the first cover body (1102) and the rod portion (1202) and are arranged at intervals along the direction away from the shaft sleeve (13), the second sealing ring (21) is clamped between the first cover body (1102) and the cylinder barrel (1101), the third sealing ring (22) is clamped between the cylinder barrel (1101) and the shaft sleeve (13), the fourth sealing ring (23) is clamped between the shaft sleeve (13) and the rod portion (1202) of the piston (12), the fifth sealing ring (24) is clamped between the inner wall of the oil chamber (1108) and the plug portion (1201) of the piston (12), and the sixth sealing ring (25) is clamped between the second cover body (1103) and the inner wall of the oil chamber (1108).

9. The hydraulic cylinder according to claim 6, wherein, It further includes a first oil inlet / outlet joint (27) and a second oil inlet / outlet joint (28); the first oil inlet / outlet joint (27) is installed on the cylinder block (11) and is communicated with the first oil inlet / outlet channel (1109), and the second oil inlet / outlet joint (28) is installed on the cylinder block (11) and is communicated with the second oil inlet / outlet channel (1110).

10. The hydraulic cylinder according to any one of claims 1 to 2, characterized in that, One end of the piston (12) passes through the rod groove (1104) and slides in the cylinder block (11), and the other end of the piston (12) is located outside the cylinder block (11) and is provided with a spherical plain bearing (29).

Images