Output amplifier oil cylinder and hydraulic system

Abstract

The utility model belongs to the technical field of fluid pressure executing mechanisms, and particularly relates to an output amplifier oil cylinder and a hydraulic system, and the output amplifier oil cylinder comprises a cylinder body assembly which comprises a first oil cavity and a second oil cavity which are used for penetrating through a first piston rod and a second piston rod respectively; a first annular oil cavity arranged around the first piston rod is formed between the first piston rod and the inner wall of one side of the first oil cavity; a second annular oil cavity arranged around the second piston rod is formed between the second piston rod and the inner wall of one side of the second oil cavity; when hydraulic oil is introduced into the first annular oil cavity, the hydraulic oil enters the second annular oil cavity through the flow channel, so that the first piston rod and the second piston rod form piston motion, and then the first annular oil cavity is communicated with the second annular oil cavity, so that the hydraulic oil enters the first annular oil cavity and the second annular oil cavity; under the condition that the size and the weight of the oil cylinder are not changed, the total contact area of hydraulic oil and the first piston rod and the second piston rod is increased to achieve amplification of output force or pressure.

Description

Technical Field

[0001] This utility model belongs to the technical field of fluid pressure actuators, and particularly relates to an output amplifier cylinder and hydraulic system. Background Technology

[0002] In the field of hydraulic systems, traditional methods to improve the output performance of hydraulic cylinders mainly include increasing the cylinder diameter, increasing the output pressure of the hydraulic pump, or using multi-stage cylinders. Increasing the cylinder diameter will increase the overall size and weight of the equipment, making it unsuitable for space-constrained applications; increasing the hydraulic pump pressure places higher demands on the equipment's sealing and component strength, increasing costs and posing safety hazards; multi-stage cylinders have complex structures, lower reliability, and occupy a large amount of space.

[0003] Therefore, due to the technical problem of difficulty in increasing the output force or pressure of the cylinder in a fixed space, it is necessary to design an output amplifier cylinder and hydraulic system.

[0004] It should be noted that the information disclosed in this background section is only for understanding the background technology of the present application concept, and therefore, the above description is not considered to constitute prior art information. Utility Model Content

[0005] This disclosure provides at least one output amplifier cylinder and hydraulic system to solve the technical problem of difficulty in increasing the output force or pressure of the cylinder in a fixed space.

[0006] In a first aspect, embodiments of this disclosure provide a hydraulic cylinder, comprising:

[0007] The cylinder assembly includes first and second oil chambers for respectively passing through the first and second piston rods;

[0008] The first and second piston rods are in contact and coaxially arranged.

[0009] A first annular oil cavity is formed between the first piston rod and one side inner wall of the first oil cavity, which is arranged around the first piston rod;

[0010] A second annular oil cavity is formed between the second piston rod and one side inner wall of the second oil cavity, surrounding the second piston rod; and,

[0011] The first piston rod has a flow channel that connects the first and second annular oil chambers;

[0012] When hydraulic oil is introduced into the first annular oil chamber, it enters the second annular oil chamber through the flow channel, so that the first piston rod and the second piston rod form a piston movement.

[0013] In one alternative embodiment, the cylinder assembly includes: a first cylinder and a second cylinder;

[0014] The first cylinder block and the second cylinder block are connected;

[0015] The first oil chamber is disposed within the first cylinder body; the first piston rod slides through the first cylinder body;

[0016] The first oil chamber is divided into a first annular oil chamber and a first movable chamber by the first piston rod, and the first movable chamber is closer to the second cylinder body than the first annular oil chamber;

[0017] A positioning sleeve is provided on the first cylinder body, and part of the positioning sleeve protrudes from the first cylinder body. One end of the first piston rod passes through the positioning sleeve and extends into the second cylinder body.

[0018] In one alternative embodiment, the other end of the first piston rod extends out of the first cylinder body after passing through a sealing assembly disposed within the first cylinder body;

[0019] A dustproof ring is fitted at the other end of the first piston rod where it extends out of the first cylinder, and a pressure plate is provided between the dustproof ring and the first cylinder.

[0020] In one optional embodiment, a first oil passage is provided in the first cylinder body, the first oil passage is connected to the first annular oil cavity, and the oil inlet of the first oil passage is provided on the first cylinder body so as to introduce hydraulic oil into the first annular oil cavity through the first oil passage.

[0021] In one alternative embodiment, the second oil chamber is disposed within the second cylinder body;

[0022] The second piston rod slides through the second cylinder body; and the second oil chamber is divided by the second piston rod into a second annular oil chamber and a second movable chamber, the second movable chamber being farther away from the first cylinder body than the second annular oil chamber;

[0023] One end of the first piston rod extends into the second annular oil chamber and then contacts the second piston rod;

[0024] One end of the second piston rod contacts the first piston rod, and the other end of the second piston rod passes through the guide sleeve provided on the second cylinder and extends out of the second cylinder;

[0025] A corresponding sealing assembly is fitted onto the second piston rod, and the sealing assembly is located between the second piston rod and the guide sleeve;

[0026] A second oil passage is provided in both the first cylinder and the second cylinder, and the second oil passage is connected to the second moving cavity.

[0027] In one alternative embodiment, the second cylinder body is fitted with a surrounding plate that surrounds the portion of the positioning sleeve that protrudes from the first cylinder body.

[0028] The second oil passage passes through the enclosure;

[0029] O-rings are provided between the portion of the second oil passage located in the enclosure and both the first and second cylinders;

[0030] The first cylinder body has a third oil passage, which is connected to the first moving cavity.

[0031] Secondly, embodiments of this disclosure also provide a hydraulic cylinder, comprising:

[0032] A cylinder block assembly, the cylinder block assembly comprising: a first cylinder block and a second cylinder block;

[0033] The first cylinder block is connected to the second cylinder block;

[0034] A first piston rod is movably inserted into the first cylinder body;

[0035] A second piston rod is movably inserted into the second cylinder body;

[0036] One end of the first piston rod extends out of the first cylinder and then into the second cylinder, where it contacts one end of the second piston rod.

[0037] The other end of the first piston rod extends out of the first cylinder after passing through the corresponding sealing assembly;

[0038] The other end of the second piston rod extends out of the second cylinder after passing through the corresponding sealing assembly.

[0039] In one optional embodiment, a first oil chamber is provided in the first cylinder body, and the first oil chamber is divided into a first annular oil chamber and a first movable chamber by the first piston rod, wherein the first movable chamber is closer to the second cylinder body than the first annular oil chamber.

[0040] The second oil chamber is disposed within the second cylinder body; and the second oil chamber is divided by the second piston rod into a second annular oil chamber and a second movable chamber, the second movable chamber being farther away from the first cylinder body than the second annular oil chamber;

[0041] The first piston rod has a flow channel that connects the first annular oil chamber and the second annular oil chamber.

[0042] The first annular oil chamber is arranged around the first piston rod;

[0043] The second annular oil chamber is arranged around the second piston rod;

[0044] When hydraulic oil is introduced into the first annular oil chamber, it enters the second annular oil chamber through the flow channel, so that the first piston rod and the second piston rod form a piston movement.

[0045] In one alternative embodiment, the second cylinder body is fitted with a surrounding plate that surrounds the portion of the positioning sleeve that protrudes from the first cylinder body.

[0046] A second oil passage is provided in the first cylinder and the second cylinder, the second oil passage passes through the enclosure plate, and the second oil passage communicates with the second moving cavity;

[0047] O-rings are provided between the portion of the second oil passage located in the enclosure and both the first and second cylinders;

[0048] The first cylinder body has a third oil passage, which is connected to the first moving cavity.

[0049] Thirdly, embodiments of this disclosure also provide a hydraulic system including the aforementioned oil cylinder.

[0050] The beneficial effects of this utility model are as follows: This hydraulic cylinder includes a cylinder body assembly, comprising first and second oil chambers for respectively passing through first and second piston rods; wherein the first and second piston rods are in contact and coaxially arranged; a first annular oil chamber is formed between the first piston rod and one side inner wall of the first oil chamber, surrounding the first piston rod; a second annular oil chamber is formed between the second piston rod and one side inner wall of the second oil chamber, surrounding the second piston rod; and the second annular oil chamber is arranged on the same side as the first annular oil chamber; and a flow channel communicating with the first and second annular oil chambers is opened in the first piston rod; when hydraulic oil enters the first annular oil chamber, the hydraulic oil enters the second annular oil chamber through the flow channel, so that the first piston rod and the second piston rod form piston movement, thereby realizing the connection between the first annular oil chamber and the second annular oil chamber, allowing hydraulic oil to enter the first annular oil chamber and the second annular oil chamber, increasing the total contact area between the hydraulic oil and the first piston rod and the second piston rod without changing the size and weight of the hydraulic cylinder, thereby amplifying the output force or pressure.

[0051] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objectives and other advantages of this invention are realized and obtained through the structures particularly pointed out in the description and the accompanying drawings.

[0052] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, preferred embodiments are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0053] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0054] Figure 1 This is a schematic diagram of the structure of an output amplifier hydraulic cylinder provided in an embodiment of the present disclosure;

[0055] Figure 2 A side view of an output amplifier cylinder provided in an embodiment of this disclosure;

[0056] Figure 3 A cross-sectional view of an output amplifier cylinder KK provided in an embodiment of this disclosure;

[0057] Figure 4 A cross-sectional view of an output amplifier cylinder NN provided in an embodiment of this disclosure;

[0058] In the picture:

[0059] 1. Cylinder block assembly, 11. First cylinder block, 111. First annular oil chamber, 112. First moving chamber, 113. Positioning sleeve, 114. Dustproof ring, 115. Pressure plate, 116. First oil passage, 117. Third oil passage, 12. Second cylinder block, 121. Second annular oil chamber, 122. Second moving chamber, 123. Guide sleeve, 124. Second oil passage, 13. Enclosure plate, 131. O-ring, 14. First oil chamber, 15. Second oil chamber;

[0060] 2. First piston rod; 21. Flow channel;

[0061] 3. Second piston rod;

[0062] 4. St. John's seal;

[0063] 5 Rem seals;

[0064] 6 Graley rings;

[0065] 7. Guide ring. Detailed Implementation

[0066] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0067] As used herein, the phrases “in one embodiment,” “according to one embodiment,” “in some embodiments,” etc., generally refer to the fact that a particular feature, structure, or characteristic following the phrase can be included in at least one embodiment of this disclosure. Therefore, a particular feature, structure, or characteristic can be included in more than one embodiment of this disclosure, such that these phrases do not necessarily refer to the same embodiment. As used herein, the terms “example,” “exemplary,” etc., are used to “serve as an example, instance, or illustration.” Any implementation, aspect, or design described herein as “example” or “exemplary” is not necessarily to be construed as preferred or superior to other implementations, aspects, or designs. Rather, the use of the terms “example,” “exemplary,” etc., is intended to present concepts in a specific manner.

[0068] In many industrial applications, such as hydraulic systems in heavy machinery and high-precision pressure testing equipment, traditional methods for improving cylinder output performance in the hydraulic system field mainly include increasing the cylinder diameter, increasing the hydraulic pump output pressure, or using multi-stage cylinders. Increasing the cylinder diameter increases the overall size and weight of the equipment, making it unsuitable for space-constrained applications; increasing the hydraulic pump pressure places higher demands on the equipment's sealing and component strength, increasing costs and posing safety hazards; multi-stage cylinders have complex structures, lower reliability, and occupy a large amount of space. Currently, there is no mature solution specifically designed to improve cylinder output performance by increasing the annular area within limited dimensions. The inventors discovered that existing cylinder output force or pressure is insufficient to meet requirements, especially when equipment space and dimensions are limited, making conventional methods of increasing cylinder volume or hydraulic pressure impractical.

[0069] The shortcomings of the above solutions are the result of the inventor's practical experience and careful research. Therefore, the discovery process of the above problems and the solutions proposed in this disclosure should be considered as the inventor's contribution to this disclosure.

[0070] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0071] The following detailed description, with reference to the accompanying drawings, describes some embodiments of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0072] like Figure 1 and Figure 3As shown, at least one disclosed embodiment provides an output amplifier cylinder, including: a cylinder assembly 1, including a first oil chamber 14 and a second oil chamber 15 for respectively passing through a first piston rod 2 and a second piston rod 3; wherein the first piston rod 2 and the second piston rod 3 are in contact and coaxially arranged, for example, the first piston rod 2 and the second piston rod 3 are in contact; a first annular oil chamber 111 is formed between the first piston rod 2 and one side inner wall of the first oil chamber 14, surrounding the first piston rod 2; a second annular oil chamber 121 is formed between the second piston rod 3 and one side inner wall of the second oil chamber 15, surrounding the second piston rod 3; and the second annular oil chamber 121 is arranged on the same side as the first annular oil chamber 111; and the first piston rod 2 has an opening inside... The system includes a flow channel 21 connecting the first annular oil chamber 111 and the second annular oil chamber 121. When hydraulic oil enters the first annular oil chamber 111, it flows through the flow channel 21 into the second annular oil chamber 121, causing the first piston rod 2 and the second piston rod 3 to move like pistons. This connects the first annular oil chamber 111 and the second annular oil chamber 121, allowing hydraulic oil to enter both chambers. Without changing the cylinder size and weight, the system increases the total contact area between the hydraulic oil and the first piston rod 2 and the second piston rod 3, thus amplifying the output force or pressure. This eliminates the need to increase the cylinder volume or hydraulic pressure, and the structure is relatively simple, highly reliable, and reduces manufacturing costs and maintenance difficulty.

[0073] When hydraulic oil is introduced into the first annular oil chamber 111, the hydraulic oil enters the second annular oil chamber 121 through the flow channel 21. The hydraulic oil contacts the first piston rod 2 and the second piston rod 3. At this time, the second piston rod 3 extends out of the cylinder assembly 1, thereby connecting the first annular oil chamber 111 and the second annular oil chamber 121. This allows hydraulic oil to enter the first annular oil chamber 111 and the second annular oil chamber 121. Without changing the size and weight of the cylinder, the total contact area between the hydraulic oil and the first piston rod 2 and the second piston rod 3 is increased to amplify the output force or pressure. This does not require increasing the cylinder volume or increasing the hydraulic pressure. Furthermore, the structure is relatively simple, highly reliable, and reduces manufacturing costs and maintenance difficulty.

[0074] In this embodiment, a first annular oil chamber 111 corresponding to the first piston rod 2 is provided in the first cylinder 11, and a second annular oil chamber 121 corresponding to the second piston rod 3 is provided in the second cylinder 12. When the hydraulic oil enters the first annular oil chamber 111, it contacts the first piston rod 2; when the hydraulic oil enters the second annular oil chamber 121, it contacts the second piston rod 3. This allows the hydraulic oil to enter the first annular oil chamber 111 and the second annular oil chamber 121, thereby increasing the total contact area between the hydraulic oil and the first piston rod 2 and the second piston rod 3 without changing the size and weight of the cylinder, thus amplifying the output force or pressure.

[0075] like Figure 3As shown, in an optional embodiment, the cylinder assembly 1 includes: a first cylinder 11 and a second cylinder 12; the first cylinder 11 and the second cylinder 12 are connected; the first oil chamber 14 is disposed in the first cylinder 11; the first piston rod 2 slides through the first cylinder 11, and one end of the first piston rod 2 extends out of the first cylinder 11 and into the second cylinder 12; the first oil chamber 14 is divided by the first piston rod 2 into a first annular oil chamber 111 and a first movable chamber 112, the first movable chamber 112 being closer to the second cylinder 12 than the first annular oil chamber 111; a positioning sleeve 113 is provided on the first cylinder 11, a portion of the positioning sleeve 113 protrudes from the first cylinder 11, and one end of the first piston rod 2 passes through the positioning sleeve 113 and extends into the second cylinder 12.

[0076] In this embodiment, the other end of the first piston rod 2 passes through the sealing assembly inside the first cylinder 11 and then extends out of the first cylinder 11. That is, the other end of the first piston rod 2 passes through the Step seal 4 and Rem seal 5 provided inside the first cylinder 11 in sequence and then extends out of the first cylinder 11. A dustproof ring 114 is provided at the position where the other end of the first piston rod 2 extends out of the first cylinder 11, and a pressure plate 115 is provided between the dustproof ring 114 and the first cylinder 11.

[0077] In this embodiment, the first piston rod 2 can divide the interior of the first cylinder 11 into a first annular oil chamber 111 and a first moving chamber 112, which facilitates the movement of the first piston rod 2 after the hydraulic oil enters the first annular oil chamber 111.

[0078] In this embodiment, a dustproof ring 114 is provided to prevent dust and impurities from entering the oil cylinder.

[0079] In this embodiment, the first annular oil chamber 111 is closer to the step seal 4 than the first moving chamber 112. Multiple guide rings 7 can be sleeved on the first piston rod 2, and the guide rings 7 are located between the step seal 4 and the first annular oil chamber 111.

[0080] In this embodiment, multiple guide rings 7 can be fitted onto the portion of the first piston rod 2 that extends into the second cylinder 12.

[0081] In this embodiment, a Gladley ring 6 may be provided at the contact position between the first piston rod 2 and the inner wall of the first cylinder 11 to isolate the first annular oil chamber 111 and the first moving chamber 112.

[0082] In one optional embodiment, a first oil passage 116 is provided in the first cylinder 11, the first oil passage 116 is connected to the first annular oil chamber 111, and the oil inlet of the first oil passage 116 is provided on the first cylinder 11 so as to introduce hydraulic oil into the first annular oil chamber 111 through the first oil passage 116.

[0083] like Figure 3 As shown, in one optional embodiment, the second oil chamber 15 is disposed within the second cylinder body 12; the second piston rod 3 slides through the second cylinder body 12; the second oil chamber 15 is divided by the second piston rod 3 into a second annular oil chamber 121 and a second movable chamber 122, the second movable chamber 122 being farther away from the first cylinder body 11 than the second annular oil chamber 121; one end of the first piston rod 2 extends into the second annular oil chamber 121 and contacts the second piston rod 3; one end of the second piston rod 3 contacts the first piston rod 2. The other end of the second piston rod 3 passes through the guide sleeve 123 provided on the second cylinder body 12 and extends out of the second cylinder body 12; a corresponding sealing assembly is fitted on the second piston rod 3, which is located between the second piston rod 3 and the guide sleeve 12, that is, a Step seal 4 and a Rem seal 5 are fitted on the second piston rod 3, and the Step seal 4 and the Rem seal 5 on the second piston rod 3 are located between the second piston rod 3 and the guide sleeve 123; a second oil passage 124 is opened in the first cylinder body 11 and the second cylinder body 12, and the second oil passage 124 communicates with the second moving cavity 122.

[0084] In this embodiment, a Gladley ring 6 may be provided at the contact position between the second piston rod 3 and the inner wall of the second cylinder 12 to isolate and seal the second annular oil chamber 121 and the second moving chamber 122.

[0085] In this embodiment, corresponding Glyd rings 6, Step seals 4 and Rem seals 5 are provided on both the first piston rod 2 and the second piston rod 3 to ensure sealing performance during cylinder operation and reduce starting pressure.

[0086] like Figure 3 As shown, in an optional embodiment, the second cylinder body 12 is covered with a surrounding plate 13, which surrounds the portion of the positioning sleeve 113 that protrudes from the first cylinder body 11; the second oil passage 124 passes through the surrounding plate 13; and O-rings 131 are provided between the portion of the second oil passage 124 located in the surrounding plate 13 and both the first cylinder body 11 and the second cylinder body 12.

[0087] In this embodiment, the bottom of the enclosure 13 structure is provided with 4-M16 screw holes for connecting the hydraulic cylinder to the external structural components.

[0088] like Figure 4 As shown, in one optional embodiment, a third oil passage 117 is provided in the first cylinder 11, and the third oil passage 117 is connected to the first moving cavity 112.

[0089] In this embodiment, Rem seal 5 refers to the Rem seal ring.

[0090] In this embodiment, the first moving cavity 112 is an empty cavity that is connected to the third oil passage 117. It is used to relieve pressure and prevent hydraulic oil from leaking and accumulating due to low friction seal. For example, when hydraulic oil in the second annular oil cavity 121 leaks into the first moving cavity 112, it can be relieved through the third oil passage 117.

[0091] In this embodiment, the openings of the first oil passage 116, the second oil passage 124, and the third oil passage 117 can all be located on the same surface of the first cylinder block 11.

[0092] In this embodiment, hydraulic oil is introduced into the first oil passage 116. After entering the first annular oil chamber 111, the hydraulic oil enters the second annular oil chamber 121 through the flow channel 21, causing the second piston rod 3 to extend, i.e., the cylinder to extend. Conversely, hydraulic oil is introduced into the second oil passage 124, causing the hydraulic oil to enter the second moving chamber 122, and the second piston rod 3 to retract, i.e., the cylinder to retract. The displacement length of the first piston rod 2 can be the stroke of the cylinder. The displacement length of the second piston rod 3 should be greater than the displacement length of the first piston rod 2 to avoid over-positioning.

[0093] In this embodiment, by providing Gladley rings 6 on both the first piston rod 2 and the second piston rod 3, the first annular oil chamber 111 and the first moving chamber 112, as well as the second annular oil chamber 121 and the second moving chamber 122, can be effectively isolated when hydraulic oil is introduced, thus preventing leakage in the two chambers and allowing the cylinder to operate normally.

[0094] At least one other disclosed embodiment also provides an output amplifier cylinder, comprising: a cylinder assembly 1, the cylinder assembly 1 including: a first cylinder 11 and a second cylinder 12; the first cylinder 11 and the second cylinder 12 are connected; a first piston rod 2 is movably disposed within the first cylinder 11; a second piston rod 3 is movably disposed within the second cylinder 12; one end of the first piston rod 2 extends out of the first cylinder 11 and into the second cylinder 12, contacting one end of the second piston rod 3; the other end of the first piston rod 2 passes through a corresponding sealing assembly and extends out of the first cylinder 11, that is, the other end of the first piston rod 2 sequentially passes through a corresponding Step seal 4 and a Rem seal 5 and extends out of the first cylinder 11; the other end of the second piston rod 3 passes through a corresponding sealing assembly and extends out of the second cylinder 12, that is, the other end of the second piston rod 3 sequentially passes through a corresponding Step seal 4 and a Rem seal 5 and extends out of the second cylinder 12.

[0095] In one optional embodiment, a first oil chamber 14 is provided in the first cylinder 11, and the first oil chamber 14 is divided into a first annular oil chamber 111 and a first moving chamber 112 by the first piston rod 2. The first moving chamber 112 is closer to the second cylinder 12 than the first annular oil chamber 111. The second oil chamber 15 is disposed in the second cylinder 12. The second oil chamber 15 is divided into a second annular oil chamber 121 and a second moving chamber 122 by the second piston rod 3. The second moving chamber 122 is farther away from the first cylinder 11 than the second annular oil chamber 121. A flow channel 21 is provided in the first piston rod 2, which connects the first annular oil chamber 111 and the second annular oil chamber 121. The first annular oil chamber 111 is arranged around the first piston rod 2. The second annular oil chamber 121 is arranged around the second piston rod 3. When hydraulic oil is introduced into the first annular oil chamber 111, the hydraulic oil enters the second annular oil chamber 121 through the flow channel 21, so that the first piston rod 2 and the second piston rod 3 form a piston movement.

[0096] In one optional embodiment, the second cylinder body 12 is covered by a surrounding plate 13, which surrounds the portion of the positioning sleeve 113 that protrudes from the first cylinder body 11; a second oil passage 124 is provided inside the first cylinder body 11 and the second cylinder body 12, the second oil passage 124 passes through the surrounding plate 13, and the second oil passage 124 communicates with the second moving cavity 122; an O-ring 131 is provided between the portion of the second oil passage 124 located in the surrounding plate 13 and the first cylinder body 11 and the second cylinder body 12; a third oil passage 117 is provided inside the first cylinder body 11, and the third oil passage 117 communicates with the first moving cavity 112.

[0097] In one optional embodiment, a dustproof ring 114 is fitted at the other end of the first piston rod 2 where it extends out of the first cylinder 11, and a pressure plate 115 is provided between the dustproof ring 114 and the first cylinder 11; the other end of the second piston rod 3 extends out of the second cylinder 12 after passing through the guide sleeve 123 provided on the second cylinder 12; the Step seal 4 and Rem seal 5 fitted on the second piston rod 3 are located between the second piston rod 3 and the guide sleeve 123.

[0098] In one optional embodiment, a first oil passage 116 is provided in the first cylinder 11, the first oil passage 116 is connected to the first annular oil chamber 111, and the oil inlet of the first oil passage 116 is provided on the first cylinder 11 so as to introduce hydraulic oil into the first annular oil chamber 111 through the first oil passage 116.

[0099] At least one other disclosed embodiment also provides a hydraulic system including the aforementioned cylinder, wherein, depending on the required use of the cylinder, hydraulic oil is pumped into the second oil passage 124 or the first oil passage 116 of the cylinder by a hydraulic pump.

[0100] In summary, the output amplifier cylinder includes: a cylinder assembly 1, including a first oil chamber 14 and a second oil chamber 15 for respectively passing through a first piston rod 2 and a second piston rod 3; wherein the first piston rod 2 and the second piston rod 3 are in contact and coaxially arranged; a first annular oil chamber 111 is formed between the first piston rod 2 and one inner wall of the first oil chamber 14, surrounding the first piston rod 2; a second annular oil chamber 121 is formed between the second piston rod 3 and one inner wall of the second oil chamber 15, surrounding the second piston rod 3; and the second annular oil chamber 121 is arranged on the same side as the first annular oil chamber 111; and a first annular oil chamber 121 communicating with the first annular oil chamber 111 and the second piston rod 3 is provided in the first piston rod 2. The flow channel 21 of the second annular oil chamber 121; when hydraulic oil enters the first annular oil chamber 111, the hydraulic oil enters the second annular oil chamber 121 through the flow channel 21, so that the first piston rod 2 and the second piston rod 3 form piston movement, thereby realizing the connection between the first annular oil chamber 111 and the second annular oil chamber 121, so that hydraulic oil enters the first annular oil chamber 111 and the second annular oil chamber 121. Without changing the size and weight of the oil cylinder, the total contact area between the hydraulic oil and the first piston rod 2 and the second piston rod 3 is increased to amplify the output force or pressure. There is no need to increase the volume of the oil cylinder or increase the hydraulic pressure. Moreover, the structure is relatively simple, the reliability is high, and the manufacturing cost and maintenance difficulty are reduced.

[0101] In the description of the embodiments of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0102] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence unless expressly indicated herein. Therefore, without departing from the teachings of the exemplary embodiments, the first element, component, region, layer, or segment discussed above may be referred to as the second element, component, region, layer, or segment.

[0103] Spatially relative terms, such as “inside,” “outside,” “below,” “below,” “down,” “above,” “up,” etc., may be used herein to describe the relationship between one element or feature illustrated in the figures and another element or feature. In addition to the orientations depicted in the figures, spatially relative terms may be intended to cover different orientations of the device in use or operation. For example, if the device in the figure is flipped, an element described as “below” or “below” other elements or features would be oriented as “above” other elements or features. Thus, the example term “below” can cover both above and below orientations. The device may be oriented in other ways (rotated 90 degrees or in other orientations), and the spatially relative descriptors used herein are interpreted accordingly.

[0104] In the above discussion, unless otherwise stated, when used to describe numerical values, the terms “about,” “approximately,” “basically,” etc., indicate a change of + / - 10% in that value.

[0105] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A hydraulic cylinder, characterized in that, include: The cylinder assembly (1) includes first and second oil chambers (14 and 15) for respectively passing through the first and second piston rods (2 and 3); The first and second piston rods (2, 3) are in contact and coaxially arranged; A first annular oil chamber (111) is formed between the first piston rod (2) and one side inner wall of the first oil chamber (14). A second annular oil cavity (121) is formed between the second piston rod (3) and one side inner wall of the second oil cavity (15), surrounding the second piston rod (3); and, The first piston rod (2) has a flow channel (21) that connects the first and second annular oil chambers (111, 121). When hydraulic oil is introduced into the first annular oil chamber (111), the hydraulic oil enters the second annular oil chamber (121) through the flow channel (21) so that the first piston rod (2) and the second piston rod (3) form a piston movement.

2. The hydraulic cylinder as described in claim 1, characterized in that, The cylinder assembly (1) includes: a first cylinder (11) and a second cylinder (12); The first cylinder (11) and the second cylinder (12) are connected; The first oil chamber (14) is disposed inside the first cylinder body (11); the first piston rod (2) slides through the first cylinder body (11); The first oil chamber (14) is divided into a first annular oil chamber (111) and a first moving chamber (112) by the first piston rod (2). The first moving chamber (112) is closer to the second cylinder (12) than the first annular oil chamber (111). A positioning sleeve (113) is provided on the first cylinder body (11), and part of the positioning sleeve (113) protrudes out of the first cylinder body (11). One end of the first piston rod (2) passes through the positioning sleeve (113) and extends into the second cylinder body (12).

3. The hydraulic cylinder as described in claim 2, characterized in that, The other end of the first piston rod (2) extends out of the first cylinder (11) after passing through the sealing assembly provided inside the first cylinder (11). A dustproof ring (114) is fitted at the other end of the first piston rod (2) where it extends out of the first cylinder (11), and a pressure plate (115) is provided between the dustproof ring (114) and the first cylinder (11).

4. The hydraulic cylinder as described in claim 2, characterized in that, The first cylinder (11) has a first oil passage (116) inside, which is connected to the first annular oil chamber (111). The oil inlet of the first oil passage (116) is opened on the first cylinder (11) so that hydraulic oil can be introduced into the first annular oil chamber (111) through the first oil passage (116).

5. The hydraulic cylinder as described in claim 2, characterized in that, The second oil chamber (15) is disposed inside the second cylinder (12); The second piston rod (3) slides through the second cylinder (12); and the second oil chamber (15) is divided by the second piston rod (3) into a second annular oil chamber (121) and a second moving chamber (122), the second moving chamber (122) being farther away from the first cylinder (11) than the second annular oil chamber (121); One end of the first piston rod (2) extends into the second annular oil chamber (121) and then contacts the second piston rod (3); One end of the second piston rod (3) contacts the first piston rod (2), and the other end of the second piston rod (3) passes through the guide sleeve (123) provided on the second cylinder (12) and extends out of the second cylinder (12). A corresponding sealing assembly is fitted on the second piston rod (3), and the sealing assembly is located between the second piston rod (3) and the guide sleeve (123); The first cylinder (11) and the second cylinder (12) are provided with a second oil passage (124), which is connected to the second moving cavity (122).

6. The hydraulic cylinder as described in claim 5, characterized in that, The second cylinder body (12) is covered with a surrounding plate (13), which surrounds the part of the positioning sleeve (113) that protrudes from the first cylinder body (11); The second oil passage (124) passes through the enclosure (13); The portion of the second oil passage (124) located in the enclosure (13) is provided with an O-ring (131) between it and the first cylinder (11) and the second cylinder (12). The first cylinder (11) has a third oil passage (117) which is connected to the first moving cavity (112).

7. A hydraulic cylinder, characterized in that, include: Cylinder assembly (1), the cylinder assembly (1) includes: a first cylinder (11) and a second cylinder (12); The first cylinder (11) is connected to the second cylinder (12); A first piston rod (2) is movably inserted inside the first cylinder (11); A second piston rod (3) is movably inserted inside the second cylinder (12); One end of the first piston rod (2) extends out of the first cylinder (11) and then into the second cylinder (12) and contacts one end of the second piston rod (3); The other end of the first piston rod (2) extends out of the first cylinder (11) after passing through the corresponding sealing assembly. The other end of the second piston rod (3) extends out of the second cylinder (12) after passing through the corresponding sealing assembly.

8. The hydraulic cylinder as described in claim 7, characterized in that, The first cylinder (11) has a first oil chamber (14) and the first oil chamber (14) is divided into a first annular oil chamber (111) and a first moving chamber (112) by the first piston rod (2). The first moving chamber (112) is closer to the second cylinder (12) than the first annular oil chamber (111). The second oil chamber (15) is disposed in the second cylinder (12); and the second oil chamber (15) is divided by the second piston rod (3) into a second annular oil chamber (121) and a second moving chamber (122), the second moving chamber (122) being farther away from the first cylinder (11) than the second annular oil chamber (121); The first piston rod (2) has a flow channel (21) inside, which connects the first annular oil chamber (111) and the second annular oil chamber (121). The first annular oil chamber (111) is arranged around the first piston rod (2); The second annular oil chamber (121) is arranged around the second piston rod (3); When hydraulic oil is introduced into the first annular oil chamber (111), the hydraulic oil enters the second annular oil chamber (121) through the flow channel (21) so that the first piston rod (2) and the second piston rod (3) form a piston movement.

9. The hydraulic cylinder as described in claim 8, characterized in that, The second cylinder body (12) is covered with a surrounding plate (13), which surrounds the part of the positioning sleeve (113) that protrudes from the first cylinder body (11); A second oil passage (124) is provided in the first cylinder (11) and the second cylinder (12). The second oil passage (124) passes through the enclosure (13) and is connected to the second moving cavity (122). The portion of the second oil passage (124) located in the enclosure (13) is provided with an O-ring (131) between it and the first cylinder (11) and the second cylinder (12). The first cylinder (11) has a third oil passage (117) which is connected to the first moving cavity (112).

10. A hydraulic system, characterized in that, Including the hydraulic cylinder as described in any one of claims 1-9.

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