Large-flow hydraulic cylinder structure

Abstract

The utility model discloses a high-flow hydraulic cylinder structure which comprises a piston, a piston rod, a cylinder bottom, a cylinder barrel, a cylinder cover, a sheath and a lug ring. The piston rod comprises a small rod head, a rod body and a core tube; a first oil passing channel and a second oil passing channel are arranged in the lug ring, and a plurality of rodless cavity oil inlets and a plurality of rod cavity oil inlets are integrated on the lug ring; the front end of the core tube is fixedly connected with the lug ring and communicated with the first oil passing channel, and the second oil passing channel is communicated with the rod cavity. The first oil passing channel and the second oil passing channel are integrally arranged on the lug ring, it is effectively guaranteed that large-flow hydraulic oil can smoothly enter the hydraulic cylinder, meanwhile, only one core pipe is arranged in the piston rod to communicate the first oil passing channel with the rodless cavity, and the second oil passing channel is directly communicated with the rod cavity; the occupation of the core pipe on the internal space of the hydraulic cylinder is effectively reduced, the oil passing quantity of an internal oil path of the hydraulic cylinder is effectively increased, and the high-flow requirement of a rodless cavity and a rod cavity is met.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic cylinders, in particular to a large-flow hydraulic cylinder structure. Background Art

[0002] At present, the market demand for large-flow hydraulic cylinders is getting higher and higher. The structural design of large-flow hydraulic cylinders mostly adopts a long-stroke design. Ordinary long-stroke and large-flow hydraulic cylinders are prone to flow loss due to their long stroke. At the same time, due to the large flow of hydraulic oil inside, it will repeatedly impact the internal seal of the hydraulic cylinder, resulting in a short life of the sealing component and prone to seal failure. Seal failure will aggravate the flow loss problem. Therefore, the internal sealing design of ordinary long-stroke and large-flow hydraulic cylinders urgently needs to be improved.

[0003] In addition, some long-stroke and high-flow hydraulic cylinders adopt an earring end oil inlet design. The advantage of this design is that it can make the cylinder barrel more integrated, thus having better sealing performance. The current earring end oil inlet long-stroke and high-flow hydraulic cylinders usually use a welded core tube to connect the rod chamber with the rod chamber oil inlet, and the rodless chamber with the rodless chamber oil inlet, but the existence of the core tube will occupy the internal space of the hydraulic cylinder, thereby limiting the oil flow inside the hydraulic cylinder, which leads to this type of hydraulic cylinder being unable to meet the large flow requirements of some main machines and having a small scope of application. Summary of the invention

[0004] In view of this, the utility model provides a large-flow hydraulic cylinder structure, which has a large internal oil flow rate and good sealing performance.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A large-flow hydraulic cylinder structure comprises a piston, a piston rod, a cylinder bottom, a cylinder barrel, a cylinder cover, a sleeve and earrings.

[0007] A cylinder bottom is provided at the rear end of the cylinder barrel, a sleeve is provided at the front end of the cylinder barrel, a cylinder head is installed at the front end of the sleeve, and a piston rod is provided in the cylinder barrel; the piston rod comprises a rod head, a rod body and a core tube, a rod head is provided at the rear end of the rod body, a piston is provided on the circumference of the rod head, a core tube is provided in the rod body, the core tube is a hollow rod body, the rear end of the core tube is fixedly connected to the rod head, and passes through the rod head to extend into the rodless cavity, the front end of the rod body extends out of the cylinder head, and an earring is provided at the front end of the rod body; a first oil passage and a second oil passage are provided inside the earring, a plurality of rodless cavity oil inlets and a plurality of rod cavity oil inlets are integrated on the earring, the plurality of rodless cavity oil inlets are all connected to the first oil passage, and the plurality of rod cavity oil inlets are all connected to the second oil passage; wherein, the front end of the core tube is fixedly connected to the earring, and is connected to the first oil passage, and the second oil passage is connected to the rod cavity.

[0008] Preferably, the rod cavity includes a first cavity and a second cavity, the first cavity is the cavity between the core tube and the rod body and the rod head, and the second cavity is the cavity between the cylinder and the rod body and the rod head; a plurality of connecting holes are arranged on the circumference of the rod head, and the plurality of connecting holes are used to connect the first cavity and the second cavity; the second oil passage is connected to the first cavity.

[0009] Preferably, a first positioning boss is provided at the rear end of the earring, a first step stop portion is provided in the circumferential direction of the first positioning boss, the first positioning boss extends into the rod body to position the earring and the rod body, and the front end face of the rod body is welded and fixed to the rear end face of the first step stop portion.

[0010] Preferably, a first oil passage joint is provided in the middle portion of the first positioning boss, a second step stop portion is provided circumferentially of the first oil passage joint, the second oil passage joint is inserted into the core tube to connect the first oil passage with the core tube, and the front end face of the core tube is welded and fixed to the rear end face of the second step stop portion.

[0011] Preferably, a second positioning boss is provided at the front end of the small rod head, a third step stop portion is provided in the circumferential direction of the second positioning boss, the second positioning boss extends into the rod body to position and cooperate with the small rod head and the rear end face of the rod body is welded and fixed to the front end face of the third step stop portion.

[0012] Preferably, a guide sleeve is provided at the rear end of the cylinder cover, the guide sleeve is arranged on the circumference of the rod body, a dynamic sealing assembly is provided between the guide sleeve and the rod body, and static sealing assemblies are provided between the guide sleeve and the cylinder barrel, and between the guide sleeve and the sleeve.

[0013] Preferably, the dynamic sealing assembly includes: a step seal, a support ring, a first Y-shaped sealing ring, a second Y-shaped sealing ring and a dustproof frame; the step seal, the support ring, the first Y-shaped sealing ring, the second Y-shaped sealing ring and the dustproof frame are sequentially spaced apart from each other from back to front between the guide sleeve and the rod body, wherein the first Y-shaped sealing ring is made of polyurethane material, and the second Y-shaped sealing ring is made of rubber material.

[0014] Preferably, the static sealing assembly includes: a Gly ring, a first O-ring, a retaining ring and a second O-ring; the Gly ring is arranged between the guide sleeve and the cylinder, the retaining ring is nested in the first O-ring, the first O-ring, the retaining ring and the second O-ring are arranged in sequence from back to front, spaced apart between the guide sleeve and the sleeve.

[0015] Preferably, an oil-free bearing is further provided between the guide sleeve and the rod body, so that the reciprocating motion of the rod body relative to the guide sleeve is smoother.

[0016] Preferably, a piston sealing ring is provided between the piston and the cylinder.

[0017] Compared with the prior art, the present application discloses a large-flow hydraulic cylinder structure, which effectively ensures that large-flow hydraulic oil can smoothly enter the hydraulic cylinder by integrating the first oil passage and the second oil passage on the earring. At the same time, only a core tube is arranged inside the piston rod to connect the first oil passage and the rodless chamber, and the second oil passage is directly connected to the rod chamber, which effectively reduces the space occupied by the core tube inside the hydraulic cylinder, effectively increases the oil flow rate of the internal oil circuit of the hydraulic cylinder, and realizes the large flow requirements of the rodless chamber and the rod chamber.

[0018] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a cross-sectional view of a high-flow hydraulic cylinder structure disclosed in an embodiment of the present application;

[0020] Figure 2 yes Figure 1 A magnified image of area A;

[0021] Figure 3 is a cross-sectional view of a piston rod and an earring of a high-flow hydraulic cylinder structure disclosed in an embodiment of the present application;

[0022] Figure 4 yes Figure 3 Enlarged view of area B;

[0023] Figure 5 is a front view of a high-flow hydraulic cylinder structure disclosed in an embodiment of the present application;

[0024] Figure 6 It is a cross-sectional view of the assembly area of ​​the core tube, the pressure test transition joint and the earring of the large flow hydraulic cylinder structure disclosed in the embodiment of the present application;

[0025] Figure 7 is a cross-sectional view of a dynamic seal assembly and a static seal assembly of a large flow hydraulic cylinder structure disclosed in an embodiment of the present application;

[0026] Figure 8 It is a schematic diagram of the oil outlet of the second oil passage in the earring in the present application.

[0027] Reference numerals:

[0028] 1. Piston;

[0029] 2. piston rod; 21. rod head; 22. rod body; 23. core tube; 211. communicating hole; 212. second positioning boss; 2121. third step stopper;

[0030] 3. Cylinder bottom; 4. Cylinder barrel; 5. Cylinder head; 6. Jacket;

[0031] 7. Earring; 71. First oil passage; 72. Oil inlet of rodless cavity; 73. Oil inlet of rod cavity; 74. First positioning boss; 75. Oil outlet of second oil passage; 741. First step stopper; 742. First oil passage joint; 7421. Second step stopper;

[0032] 8. Guide sleeve;

[0033] 9. Dynamic seal assembly; 91. Step seal; 92. Support ring; 93. First Y-shaped seal ring; 94. Second Y-shaped seal ring; 95. Dustproof frame;

[0034] 10. static sealing assembly; 101. Gly ring; 102. first O-ring; 103. retaining ring; 104. second O-ring;

[0035] 20. Oil-free bearing; 30. Piston sealing ring;

[0036] 40, a rod cavity; 401, a first cavity; 402, a second cavity;

[0037] 50. Rodless cavity; 60. Pressure test transition joint. DETAILED DESCRIPTION

[0038] The utility model discloses a large-flow hydraulic cylinder structure, which has a large internal oil flow rate and good sealing performance.

[0039] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0040] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0041] Reference below Figures 1 to 8The large flow hydraulic cylinder structure in the embodiment of the utility model is described.

[0042] like Figure 1 As shown, an embodiment of the present application discloses a large-flow hydraulic cylinder structure, including: a piston 1, a piston rod 2, a cylinder bottom 3, a cylinder barrel 4, a cylinder cover 5, a sleeve 6 and an earring 7.

[0043] Among them, the rear end of the cylinder barrel 4 is provided with a cylinder bottom 3, the front end of the cylinder barrel 4 is provided with a sleeve 6, the front end of the sleeve 6 is installed with a cylinder cover 5, and a piston rod 2 is provided in the cylinder barrel 4; the piston rod 2 includes a rod head 21, a rod body 22 and a core tube 23, the rear end of the rod body 22 is provided with a rod head 21, the circumference of the rod head 21 is provided with a piston 1, and the rod body 22 is provided with a core tube 23, the core tube 23 is a hollow rod body 22, the rear end of the core tube 23 is fixedly connected to the rod head 21, and passes through the rod head 21 to extend into the rodless cavity 50, the rod body 2 2 extends out from the cylinder cover 5, and the front end of the rod body 22 is provided with an earring 7; the interior of the earring 7 is provided with a first oil passage 71 and a second oil passage, and the earring 7 is integrated with a plurality of rodless cavity oil inlets 72 and a plurality of rod cavity oil inlets 73, the plurality of rodless cavity oil inlets 72 are all connected to the first oil passage 71, and the plurality of rod cavity oil inlets 73 are all connected to the second oil passage; wherein, the front end of the core tube 23 is fixedly connected to the earring 7, and is connected to the first oil passage 71, and the second oil passage is connected to the rod cavity 40.

[0044] The oil inlets of the rodless chamber 50 and the rod chamber 40 of the hydraulic cylinder are both integrated on the earring 7, which can avoid opening an oil inlet on the cylinder barrel 4, can make the cylinder barrel 4 more integrated, and effectively improve the overall sealing performance of the hydraulic cylinder. At the same time, the earring 7 is integrated with a first oil passage 71 and a second oil passage, wherein the first oil passage 71 is connected to the rodless chamber 50 through the core tube 23 of the piston rod 2, and the second oil passage is directly connected to the rod chamber 40. In this way, the hydraulic oil can enter the first oil passage 71 through the rodless chamber oil inlet 72, and enter the rodless chamber 50 through the first oil passage 71 and the core tube 23 in turn, and the hydraulic oil can also enter the second oil passage through the rod chamber oil inlet 73, and directly enter the rod chamber 40 through the second oil passage.

[0045] Compared with the oil-inlet hydraulic cylinder at the earring 7 end in the prior art, the present application effectively ensures that a large amount of hydraulic oil can smoothly enter the hydraulic cylinder by integrating the first oil passage 71 and the second oil passage on the earring 7. At the same time, only a core tube 23 is arranged inside the piston rod 2 to connect the first oil passage 71 and the rodless chamber 50, and the second oil passage is directly connected to the rod chamber 40, which effectively reduces the space occupied by the core tube 23 inside the hydraulic cylinder, effectively increases the oil flow rate of the internal oil circuit of the hydraulic cylinder, and realizes the large flow requirements of the rodless chamber 50 and the rod chamber 40.

[0046] For example Figure 1 As shown, the first oil passage 71 extends in the front-to-back direction and is coaxially arranged with the core tube 23. In this way, there is no bending part in the oil passage composed of the first oil passage 71 and the core tube 23, and the hydraulic oil can flow directly into the rodless chamber 50 from front to back, which can effectively reduce the pressure loss of the hydraulic cylinder.

[0047] In some embodiments, the rod chamber 40 includes a first cavity 401 and a second cavity 402, wherein the first cavity 401 is a cavity between the core tube 23 and the rod body 22 and the rod head 21, and the second cavity 402 is a cavity between the cylinder 4 and the rod body 22 and the rod head 21; a plurality of connecting holes 211 are arranged in the circumferential direction of the rod head 21, and the plurality of connecting holes 211 are used to connect the first cavity 401 and the second cavity 402; and the second oil passage is connected to the first cavity 401. The arrangement of the first cavity 401 and the second cavity 402 effectively increases the volume of the rod chamber 40, and realizes the large flow requirement of the rod chamber 40.

[0048] In some embodiments, a first positioning boss 74 is provided at the rear end of the earring 7, and a first step stop portion 741 is provided circumferentially of the first positioning boss 74. The first positioning boss 74 extends into the rod body 22 to position the earring 7 and fit the rod body 22. The front end face of the rod body 22 is welded and fixed to the rear end face of the first step stop portion 741.

[0049] The first positioning boss 74 can facilitate the positioning and cooperation between the rod body 22 and the earring 7. At the same time, the welding and fixing of the front end face of the rod body 22 and the rear end face of the first step stopper 741 can effectively improve the connection strength between the rod body 22 and the earring 7, effectively avoid cracks or breakage between the rod body 22 and the earring 7, reduce the possibility of oil leakage here, and effectively enhance the sealing performance of the hydraulic cylinder.

[0050] In this embodiment, for example Figure 2 As shown, the front end face of the rod body 22 and the rear end face of the first step stop portion 741 are both provided with a U-shaped welding groove so that the welding section between the rod body 22 and the first positioning boss 74 is U-shaped. The U-shaped welding section can further improve the connection strength between the rod body 22 and the first positioning boss 74.

[0051] In some embodiments, a first oil passage 71 joint is provided in the middle portion of the first positioning boss 74, a second step stop portion 7421 is provided circumferentially of the first oil passage 71 joint, and the second oil passage joint is inserted into the core tube 23 to connect the first oil passage 71 with the core tube 23, and the front end face of the core tube 23 is welded and fixed to the rear end face of the second step stop portion 7421.

[0052] The first oil passage 71 joint can facilitate the positioning and matching between the core tube 23 and the earring 7, and at the same time, can also make the communication between the first oil passage 71 and the core tube 23 more convenient and quick. The welding and fixing of the front end face of the core tube 23 and the rear end face of the second step stopper 7421 can effectively improve the connection strength between the core tube 23 and the earring 7, effectively avoid cracks or breaks between the core tube 23 and the earring 7, reduce the possibility of oil leakage here, and effectively enhance the sealing performance of the hydraulic cylinder.

[0053] In this embodiment, for example Figure 2 As shown, the front end face of the core tube 23 and the rear end face of the second step stop portion 7421 are both provided with a U-shaped welding groove so that the welding section between the core tube 23 and the first oil passage 71 joint is U-shaped. The U-shaped welding section can further improve the connection strength between the core tube 23 and the first oil passage 71 joint.

[0054] In some embodiments, a second positioning boss 212 is provided at the front end of the rod head 21, and a third step stop portion 2121 is provided circumferentially of the second positioning boss 212. The second positioning boss 212 extends into the rod body 22 to position and cooperate with the rod body 22, and the rear end face of the rod body 22 is welded and fixed to the front end face of the third step stop portion 2121.

[0055] The second positioning boss 212 can facilitate the positioning and cooperation between the small rod head 21 and the rod body 22. At the same time, the welding and fixing of the rear end face of the rod body 22 and the front end face of the third step stop portion 2121 can effectively improve the connection strength between the small rod head 21 and the rod body 22, effectively avoid cracks or breakage between the small rod head 21 and the rod body 22, reduce the possibility of oil leakage here, and effectively enhance the sealing performance of the hydraulic cylinder.

[0056] In this embodiment, for example Figure 4 As shown, the rear end face of the rod body 22 and the front end face of the third step stop portion 2121 are both provided with a U-shaped welding groove so that the welding section between the rod body 22 and the second positioning boss 212 is U-shaped. The U-shaped welding section can further improve the connection strength between the rod body 22 and the second positioning boss 212.

[0057] In some embodiments, a guide sleeve 8 is provided at the rear end of the cylinder head 5, and the guide sleeve 8 is arranged on the circumference of the rod body 22. A dynamic sealing assembly 9 is provided between the guide sleeve 8 and the rod body 22, and static sealing assemblies 10 are provided between the guide sleeve 8 and the cylinder barrel 4, and between the guide sleeve 8 and the sleeve 6.

[0058] When the piston rod 2 reciprocates in the cylinder 4 , the guide sleeve 8 can guide the piston rod 2 to prevent the piston rod 2 from deviating from the motion trajectory or shaking in the cylinder 4 and colliding with the inner wall of the cylinder 4 .

[0059] For example Figure 7 As shown, the guide sleeve 8 is arranged in the second cavity 402, one side of the guide sleeve 8 abuts against the surface of the rod body 22, part of the other side abuts against the inner side of the sleeve 6, and another part abuts against the inner side of the cylinder 4. Among them, the guide sleeve 8 and the sleeve 6, as well as the guide sleeve 8 and the cylinder 4 are relatively static and will not move relative to each other. Therefore, the sealing assembly arranged between the guide sleeve 8 and the sleeve 6, as well as the guide sleeve 8 and the cylinder 4 is called a static sealing assembly 10; when the hydraulic cylinder is working, the piston rod 2 will reciprocate in the cylinder 4, that is, when the piston rod 2 moves, the rod body 22 of the piston rod 2 reciprocates relative to the guide sleeve 8, therefore, the sealing assembly arranged between the guide sleeve 8 and the rod body 22 is called a dynamic sealing assembly 9.

[0060] The arrangement of the dynamic seal assembly 9 and the static seal assembly 10 effectively improves the overall sealing performance of the hydraulic cylinder, can effectively prevent the leakage of the hydraulic oil inside the hydraulic cylinder, reduce the hydraulic oil flow loss and hydraulic oil pressure loss of the hydraulic cylinder, so that the hydraulic cylinder can meet the large flow requirements of the main engine.

[0061] In this embodiment, the dynamic sealing assembly 9 includes: a step seal 91, a support ring 92, a first Y-shaped sealing ring 93, a second Y-shaped sealing ring 94 and a dustproof frame 95; the step seal 91, the support ring 92, the first Y-shaped sealing ring 93, the second Y-shaped sealing ring 94 and the dustproof frame 95 are sequentially spaced apart from back to front and arranged between the guide sleeve 8 and the rod body 22, wherein the first Y-shaped sealing ring 93 is made of polyurethane material, and the second Y-shaped sealing ring 94 is made of rubber material.

[0062] The step seal 91 has the characteristics of high strength, corrosion resistance, high temperature and high pressure resistance, and good sealing performance, and can effectively improve the sealing life of the dynamic seal assembly 9; the support ring 92 can play a good supporting role; the dustproof frame 95 can block external dust and prevent external dust from affecting the normal operation of the hydraulic cylinder.

[0063] The first Y-shaped sealing ring 93 made of polyurethane material has good impact resistance and sealing performance, and can effectively prevent hydraulic oil from leaking when impacted by a large flow of hydraulic oil; the second Y-shaped sealing ring 94 arranged on the front side of the first Y-shaped sealing ring 93 is made of rubber material and has good elasticity itself. It can effectively make up for the shortcomings of the first Y-shaped sealing ring 93 made of polyurethane material that it is deformed and difficult to rebound after long-term use, and can continue to ensure the sealing performance of the hydraulic cylinder, effectively improving the sealing life of the dynamic sealing assembly 9.

[0064] In this embodiment, the static sealing assembly 10 includes: a Gly ring 101, a first O-ring 102, a retaining ring 103 and a second O-ring 104; the Gly ring 101 is arranged between the guide sleeve 8 and the cylinder 4, the retaining ring 103 is nested in the first O-ring 102, and the first O-ring 102, the retaining ring 103 and the second O-ring 104 are spaced apart from each other from back to front and arranged between the guide sleeve 8 and the sleeve 6.

[0065] The Gly ring 101 can play a good supporting role when assembling the guide sleeve 8, reducing the damage to the subsequent sealing components during assembly; the nested design of the first O-ring 102 and the retaining ring 103 can effectively enhance the sealing performance; the waterproof retaining ring 103 can prevent external liquid from entering the hydraulic cylinder, thereby ensuring the safety of the hydraulic cylinder.

[0066] For example Figure 7 As shown, two pairs of first O-rings 102 and retaining rings 103 are provided, and the two pairs of first O-rings 102 and retaining rings 103 are spaced apart and arranged between the guide sleeve 8 and the sheath 6 along the front-to-back direction.

[0067] In this embodiment, an oil-free bearing 20 is further provided between the guide sleeve 8 and the rod body 22, which can effectively reduce the friction between the guide sleeve 8 and the rod body 22, so that the reciprocating motion of the rod body 22 relative to the guide sleeve 8 is smoother.

[0068] In some embodiments, a piston seal ring 30 is provided between the piston 1 and the cylinder barrel 4. The piston seal ring 30 can effectively reduce the pressure loss inside the hydraulic cylinder and ensure the working performance of the hydraulic cylinder. At the same time, the piston seal ring 30 can also reduce the friction between the piston 1 and the inner wall of the cylinder barrel 4, thereby reducing wear and heat loss.

[0069] In some embodiments, threads are provided inside the rear end of the core tube 23. When performing a pressure test, the pressure test transition joint 60 can be threadedly connected to the rear end of the core tube 23. Compared with the welding assembly in the prior art, the threaded connection can avoid the risk of oil leakage in the weld.

[0070] Other structures and operations of the large-flow hydraulic cylinder structure according to the embodiment of the utility model are known to ordinary technicians in the field and will not be described in detail here.

[0071] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0072] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A large flow hydraulic cylinder structure, characterized in that: include: A piston, a piston rod, a cylinder bottom, a cylinder barrel, a cylinder cover, a sleeve and earrings; the rear end of the cylinder barrel is provided with a cylinder bottom, the front end of the cylinder barrel is provided with a sleeve, the front end of the sleeve is installed with a cylinder cover, and the cylinder barrel is provided with a piston rod; The piston rod comprises a rod head, a rod body and a core tube, the rear end of the rod body is provided with a rod head, a piston is provided on the circumference of the rod head, the rod body is provided with a core tube, the core tube is a hollow rod body, the rear end of the core tube is fixedly connected to the rod head, and passes through the rod head to extend into the rodless cavity, the front end of the rod body extends out from the cylinder cover, and the front end of the rod body is provided with an earring; The earring is provided with a first oil passage and a second oil passage inside, and a plurality of rodless cavity oil inlets and a plurality of rod cavity oil inlets are integrated on the earring, and the plurality of rodless cavity oil inlets are all connected to the first oil passage, and the plurality of rod cavity oil inlets are all connected to the second oil passage; Wherein, the front end of the core tube is fixedly connected to the earring and communicated with the first oil passage, and the second oil passage is communicated with the rod cavity.

2. The large flow hydraulic cylinder structure according to claim 1 is characterized in that: The rod cavity includes a first cavity and a second cavity, the first cavity is the cavity between the core tube and the rod body and the rod head, and the second cavity is the cavity between the cylinder and the rod body and the rod head; a plurality of connecting holes are arranged on the circumference of the rod head, and the plurality of connecting holes are used to connect the first cavity and the second cavity; the second oil passage is connected to the first cavity.

3. The large flow hydraulic cylinder structure according to claim 1 is characterized in that: A first positioning boss is provided at the rear end of the earring, a first step stop portion is provided in the circumferential direction of the first positioning boss, the first positioning boss extends into the rod body so that the earring is positioned and matched with the rod body, and the front end face of the rod body is welded and fixed to the rear end face of the first step stop portion.

4. The large flow hydraulic cylinder structure according to claim 3 is characterized in that: A first oil passage joint is provided in the middle of the first positioning boss, a second step stop portion is provided in the circumferential direction of the first oil passage joint, the second oil passage joint is inserted into the core tube to connect the first oil passage with the core tube, and the front end face of the core tube is welded and fixed to the rear end face of the second step stop portion.

5. The large flow hydraulic cylinder structure according to claim 1, characterized in that: A second positioning boss is provided at the front end of the small rod head, and a third step stop portion is provided on the circumference of the second positioning boss. The second positioning boss extends into the rod body to position and cooperate with the small rod head and the rear end face of the rod body is welded and fixed to the front end face of the third step stop portion.

6. The large flow hydraulic cylinder structure according to claim 1, characterized in that: A guide sleeve is provided at the rear end of the cylinder cover, and the guide sleeve is arranged on the circumference of the rod body. A dynamic sealing assembly is provided between the guide sleeve and the rod body, and static sealing assemblies are provided between the guide sleeve and the cylinder barrel, and between the guide sleeve and the sleeve.

7. The large flow hydraulic cylinder structure according to claim 6, characterized in that: The dynamic sealing assembly includes: a step seal, a support ring, a first Y-shaped sealing ring, a second Y-shaped sealing ring and a dustproof frame; the step seal, the support ring, the first Y-shaped sealing ring, the second Y-shaped sealing ring and the dustproof frame are sequentially spaced apart from back to front and arranged between the guide sleeve and the rod body, wherein the first Y-shaped sealing ring is made of polyurethane material, and the second Y-shaped sealing ring is made of rubber material.

8. The large flow hydraulic cylinder structure according to claim 6, characterized in that: The static sealing assembly includes: a Gly ring, a first O-ring, a retaining ring and a second O-ring; the Gly ring is arranged between the guide sleeve and the cylinder, the retaining ring is nested in the first O-ring, the first O-ring, the retaining ring and the second O-ring are arranged in sequence from back to front, spaced apart between the guide sleeve and the sleeve.

9. The large flow hydraulic cylinder structure according to claim 6, characterized in that: An oil-free bearing is also provided between the guide sleeve and the rod body, so that the reciprocating motion of the rod body relative to the guide sleeve is smoother.

10. The large flow hydraulic cylinder structure according to claim 1, characterized in that: A piston sealing ring is arranged between the piston and the cylinder.

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