Hydraulic device and loader
By adopting a parabolic buffer end design in the hydraulic cylinder, the problem of poor buffering effect of existing hydraulic cylinders is solved, the piston is smoothly decelerated, and the buffering performance of the hydraulic device is improved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-29
- Publication Date
- 2026-03-13
AI Technical Summary
The existing hydraulic cylinder's buffer structure has poor buffering effect, causing the piston to impact the cylinder body at a high speed at the end of its stroke, which may cause damage.
Design a hydraulic device in which the buffer end of the buffer component has a parabolic cross section with the vertex of the buffer end facing the buffer cavity. The continuous and gradual change characteristics of the parabola guide the hydraulic oil to transition smoothly, and gradually increase the cross-sectional area of the buffer end in the buffer cavity to slow down the piston speed.
By designing a parabolic buffer end, the piston achieves smooth and uniform deceleration, improves the buffering effect of the hydraulic device, reduces the impact between the piston and hydraulic oil, and protects the cylinder.
Smart Images
Figure CN223991879U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of hydraulic equipment technology, and in particular to a hydraulic device and a loader. Background Technology
[0002] A hydraulic cylinder is an actuator in a hydraulic system that converts hydraulic energy into mechanical energy to achieve linear motion or force output. A hydraulic cylinder consists of a cylinder body and a piston housed within it. The cylinder body contains hydraulic oil, and the piston moves within the cylinder body at a certain speed under the pressure of the hydraulic oil. When the piston reaches the end of its stroke, it impacts the cylinder body at a relatively high speed, which may damage the cylinder body.
[0003] In the prior art, a cylindrical buffer structure is provided at the end of the piston to slow down the piston's movement speed.
[0004] However, the buffering effect of existing hydraulic cylinder buffer structures is poor. Utility Model Content
[0005] This application provides a hydraulic device and a loader, which improves the buffering effect of the hydraulic device.
[0006] In a first aspect, the hydraulic device provided in this application includes: a cylinder, a piston, and a buffer component, wherein the cylinder has a buffer chamber and the piston is disposed within the cylinder.
[0007] A buffer element is inserted onto the piston, with its end extending out of the piston to form a buffer end. The axial section of the buffer end is parabolic, and the apex of the buffer end faces the buffer cavity.
[0008] In one possible implementation, the hydraulic device provided in this application has a parabolic cross-section for the buffer chamber, with the opening of the buffer chamber facing the buffer end.
[0009] When the buffer end moves completely into the buffer cavity, there is a gap between the buffer cavity and the buffer end.
[0010] In one possible implementation, the hydraulic device provided in this application has a hollow buffer end.
[0011] In one possible implementation, the hydraulic device provided in this application has a buffer end made of one of the following materials: cast iron, bronze, steel, and organic molecular materials.
[0012] In one possible implementation, the hydraulic device provided in this application further includes a connecting part, which is threadedly connected to the piston.
[0013] In one possible implementation, the hydraulic device provided in this application further includes at least one fastener, and the connecting portion has at least one connecting hole. The fastener is connected to the connecting portion in sequence via the piston and the connecting hole.
[0014] In one possible implementation, the hydraulic device provided in this application further includes a first seal, which is sleeved on a buffer and abuts against a piston.
[0015] In one possible implementation, the hydraulic device provided in this application further includes a second seal, which is sleeved on the piston and abuts against the inner wall of the cylinder.
[0016] In one possible implementation, the hydraulic device provided in this application further includes at least one support member disposed between the piston and the cylinder.
[0017] Secondly, this application provides a loader, including a loader body and a hydraulic device provided in the first aspect described above, disposed on the loader body.
[0018] The hydraulic device and loader provided in this application include a cylinder, a piston, and a buffer component. The cylinder contains hydraulic oil and has a buffer chamber. The piston is located within the cylinder and moves under the pressure of the hydraulic oil. The buffer component is inserted onto the piston, with its end extending beyond the piston to form a buffer end. The axial section of the buffer end is parabolic, and the apex of the buffer end faces the buffer chamber.
[0019] As the piston moves to the end of the cylinder, the buffer end moves into the buffer chamber. Due to the continuously changing curvature of the parabola, the parabolic cross-section of the buffer end guides the hydraulic oil through a smooth transition, reducing the impact between the buffer end and the hydraulic oil. Furthermore, since the apex of the buffer end faces the buffer chamber, as the stroke of the buffer end increases, the cross-sectional area of the buffer end entering the buffer chamber gradually increases. The resistance experienced by the buffer end within the buffer chamber gradually increases, thus increasing the resistance experienced by the piston. This gradually slows down the piston's movement, achieving a smooth and uniform deceleration and improving the buffering effect of the hydraulic system. Attached Figure Description
[0020] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0021] Figure 1 Schematic diagram of the hydraulic device provided in the embodiments of this application Figure 1 ;
[0022] Figure 2 Schematic diagram of the hydraulic device provided in the embodiments of this application Figure 2 ;
[0023] Figure 3 for Figure 2 Enlarged structural diagram of part A.
[0024] Explanation of reference numerals in the attached figures:
[0025] 100-Cylinder block; 110-Buffer chamber; 101-Cylinder barrel; 102-End cap; 120-First lug; 130-Oil port; 140-Receiving chamber;
[0026] 200-piston;
[0027] 300 - Buffer component; 310 - Buffer end; 320 - Connecting part; 321 - Connecting hole;
[0028] 400 - Fasteners;
[0029] 500 - Piston rod; 510 - Second earring;
[0030] 600 - First seal;
[0031] 700 - Second seal;
[0032] 800 - Support component.
[0033] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation
[0034] First, those skilled in the art should understand that these embodiments are merely for explaining the technical principles of this application and are not intended to limit the scope of protection of this application. Those skilled in the art can make adjustments as needed to adapt to specific application scenarios.
[0035] Secondly, it should be noted that, in the description of this application, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, an indirect connection through an intermediate medium, or the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.
[0036] Furthermore, it should be noted that in the description of this application, the terms "upper," "lower," "front," "back," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application 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. Therefore, they should not be construed as limitations on this application.
[0037] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.
[0038] As shown in the background section, in the prior art, a hydraulic cylinder includes a cylinder body and a piston disposed within the cylinder body. The cylinder body contains hydraulic oil, and the piston moves within the cylinder body at a certain speed under the pressure of the hydraulic oil. When the piston reaches the end of its stroke, it impacts the cylinder body at a relatively high speed, which may damage the cylinder body. A cylindrical buffer post is provided at the end of the piston to slow down the piston's movement.
[0039] However, since the cross-sectional area of the buffer column remains constant, the buffering braking force on the buffer column remains constant during the movement of the buffer column, resulting in a poor buffering effect.
[0040] Based on this, the hydraulic device and loader provided in this application include a cylinder, a piston, and a buffer component. The cylinder contains hydraulic oil and has a buffer chamber. The piston is located within the cylinder and moves under the pressure of the hydraulic oil. The buffer component is inserted onto the piston, with its end extending beyond the piston to form a buffer end. The axial section of the buffer end is parabolic, and the apex of the buffer end faces the buffer chamber.
[0041] As the piston moves to the end of the cylinder, the buffer end moves into the buffer chamber. Due to the continuously changing curvature of the parabola, the parabolic cross-section of the buffer end guides the hydraulic oil through a smooth transition, reducing the impact between the buffer end and the hydraulic oil. Furthermore, since the apex of the buffer end faces the buffer chamber, as the stroke of the buffer end increases, the cross-sectional area of the buffer end entering the buffer chamber gradually increases. The resistance experienced by the buffer end within the buffer chamber gradually increases, thus increasing the resistance experienced by the piston and gradually slowing its movement. This achieves a smooth and uniform deceleration of the piston, improving the buffering effect of the hydraulic system.
[0042] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below with reference to the accompanying drawings. In the drawings, the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The described embodiments are some, but not all, of the embodiments of this application. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.
[0043] Reference Figures 1 to 3 As shown, the hydraulic device provided in this application includes: a cylinder 100, a piston 200 and a buffer 300. The cylinder 100 is provided with a buffer chamber 110. The piston 200 is disposed in the cylinder 100.
[0044] A buffer member 300 is inserted on the piston 200. The end of the buffer member 300 extends out of the piston 200 to form a buffer end 310. The axial section of the buffer end 310 is parabolic, and the vertex of the buffer end 310 faces the buffer cavity 110.
[0045] It should be noted that the hydraulic devices provided in this application embodiment include, but are not limited to, those used in mechanical equipment such as excavators, loaders, and cranes.
[0046] The hydraulic device provided in this application can be a hydraulic cylinder or other hydraulic equipment, and this application does not impose excessive limitations on it. This application uses a hydraulic cylinder as an example to describe the hydraulic device.
[0047] In a specific implementation, the cylinder body 100 has a receiving cavity 140, which is connected to the buffer cavity 110. The receiving cavity 140 is used to receive hydraulic oil. The piston 200 is inserted into the receiving cavity 140, which divides the receiving cavity 140 into two independent chambers. The piston 200 moves under the pressure of the hydraulic oil, converting hydraulic energy into linear mechanical motion.
[0048] For example, piston 200 may be made of high-strength materials such as steel, aluminum alloy or bronze to withstand high pressure and friction.
[0049] In some embodiments, refer to Figure 1As shown, the cylinder body 100 may include a cylinder barrel 101 and an end cap 102, and a buffer chamber 110 may be disposed on the end cap 102. The cylinder barrel 101 is the main pressure-bearing component of the hydraulic cylinder, which can withstand the internal pressure generated by the hydraulic oil, providing a smooth movement path for the piston 200 and ensuring that the piston 200 moves linearly within the cylinder barrel 101. The end cap 102 can close the end of the cylinder barrel 101, forming a sealed cavity to contain the hydraulic oil.
[0050] In some embodiments, the cylinder 101 can be manufactured separately from the end cap 102. For example, the end cap 102 can be connected to the cylinder 101 by means of threads, flanges or welding. A sealing ring or O-ring can be provided at the connection between the end cap 102 and the cylinder 101 to improve the sealing performance. Alternatively, the cylinder 101 can be integrally formed with the end cap 102. This application does not impose too many restrictions on this.
[0051] The axial section of the buffer end 310 is parabolic. It should be noted that the axial section is the section passing through the axis of symmetry of the buffer end 310. The axial section is parabolic, that is, the trajectory of the edge of the axial section is a parabola. Therefore, the vertex of the buffer end 310 is the vertex of the parabola.
[0052] It should also be noted that by providing a buffer chamber 110 within the cylinder body 100, when the piston 200 moves toward the cylinder body 100, the buffer end 310 extending from the piston 200 moves toward the buffer chamber 110. When the piston 200 moves to the end of the cylinder body 100, the buffer portion moves into the buffer chamber 110, and the buffer end 310 experiences resistance from hydraulic oil within the buffer chamber 110. The magnitude of this resistance is: Where P is the liquid pressure (which can be considered a constant), and S is the cross-sectional area of the buffer end 310.
[0053] Since the axial section of the buffer end 310 is parabolic, the equation of the parabola can be set as: Where x is the stroke of piston 200 (that is, the stroke of buffer end 310), y is the radius of buffer end 310, x is the independent variable, y is the dependent variable, and A is a constant. 2 Proportional.
[0054] Therefore, the cross-sectional area of the parabolic buffer end 310 is: ,because Since the radius is constant, the cross-sectional area of the parabolic buffer end 310 is proportional to the stroke of the buffer end 310. In other words, the resistance of the buffer end 310 to the hydraulic oil is also proportional to the stroke of the buffer end 310.
[0055] Specifically, when the piston 200 moves to the end of the cylinder 100, the buffer end 310 moves into the buffer chamber 110. Due to the continuous and gradual change in the curvature of the parabola, the buffer end 310, with its parabolic cross-section, can guide the hydraulic oil to transition smoothly, reducing the impact between the buffer end 310 and the hydraulic oil. Furthermore, since the apex of the buffer end 310 faces the buffer chamber 110, as the stroke of the buffer end 310 increases, the cross-sectional area of the buffer end 310 entering the buffer chamber 110 gradually increases. The resistance of the buffer end 310 to the hydraulic oil within the buffer chamber 110 gradually increases, thereby increasing the resistance to the piston 200 and gradually slowing down the piston 200's movement speed. This achieves a smooth and uniform deceleration of the piston 200, improving the buffering effect of the hydraulic device.
[0056] In some embodiments, refer to Figure 3 As shown, the cross-section of the buffer cavity 110 is parabolic, and the opening of the buffer cavity 110 faces the buffer end 310.
[0057] When the buffer end 310 is fully moved into the buffer cavity 110, there is a gap between the buffer cavity 110 and the buffer end 310.
[0058] Specifically, the opening of the buffer cavity 110 faces the buffer end 310 to facilitate the entry of the buffer end 310 into the buffer cavity 110. The cross-section of the buffer cavity 110 is parabolic, that is, the cross-sectional shape of the buffer cavity 110 is the same as the axial cross-sectional shape of the buffer end 310. When the buffer end 310 moves into the buffer cavity 110, the buffering process is gradual rather than sudden. In this way, the gradually changing resistance provides a smooth deceleration process.
[0059] Understandably, the gap between the buffer cavity 110 and the buffer end 310 can reduce the direct contact between the buffer element 300 and the inner wall of the buffer cavity 110, thereby reducing friction and wear.
[0060] In some embodiments, refer to Figure 3 As shown, the buffer end 310 has a hollow structure.
[0061] It should be noted that the hollow structure can reduce the weight of the buffer end 310, thereby reducing inertial force, energy loss, and manufacturing costs.
[0062] In some embodiments, refer to Figure 3 As shown, the material of the buffer end 310 is one of cast iron, bronze, steel, and organic molecular materials.
[0063] In practical implementation, suitable materials can be selected for different working conditions. Cast iron is low in cost and has high wear resistance, making it suitable for low-speed, high-load scenarios; bronze has both self-lubricating and corrosion-resistant properties, making it suitable for high-speed or humid environments; steel has high strength and impact resistance, making it suitable for heavy-duty equipment under high pressure and high impact; organic polymer materials (such as polyurethane) are lightweight and have good shock absorption and noise reduction effects, making them suitable for lightweight or precision systems.
[0064] In some embodiments, refer to Figure 3 As shown, the buffer 300 also includes a connecting part 320, which is connected to the piston 200 by a thread.
[0065] Understandably, threaded connections provide a robust mechanical connection capable of withstanding high pressure and vibration in hydraulic systems, thus ensuring the stability of the buffer 300 during operation.
[0066] The threaded connection also makes the installation and removal of the buffer 300 simple and quick, easy to operate, and convenient to replace the buffer 300, reducing the downtime and maintenance costs of the hydraulic system.
[0067] In some embodiments, refer to Figure 3 As shown, the hydraulic device also includes at least one fastener 400, and the connecting portion 320 has at least one connecting hole 321. The fastener 400 is connected to the connecting portion 320 in sequence via the piston 200 and the connecting hole 321.
[0068] Specifically, the fastener 400 provides additional mechanical fixation, enhancing the connection strength and stability between the connection 320 and the piston 200, especially under high pressure or high load conditions, reducing the possibility of the buffer 300 loosening, shifting, or rotating. For example, the fastener 400 can be a screw or bolt, and the connection hole 321 can be a threaded hole.
[0069] It should be noted that the number of fasteners 400 can be one; the number of fasteners 400 can also be two, and the two fasteners 400 can be set symmetrically; the number of fasteners 400 can also be more than two, and the fasteners 400 can be set evenly.
[0070] Reference Figure 1 and Figure 2 As shown, the hydraulic device also includes a piston rod 500, which is inserted into the cylinder 100 and connected to the side of the piston 200 away from the buffer end 310.
[0071] It should be noted that the piston rod 500 can be used to connect external loads or mechanical components, such as robotic arms, presses or other actuators, and this application embodiment does not impose too many restrictions on this.
[0072] By setting the piston rod 500, the piston rod 500 can transmit the linear motion generated by the piston 200 in the cylinder 100 to the external mechanical system, so that the hydraulic energy can be converted into mechanical energy to drive the load or perform specific mechanical operations.
[0073] It should also be noted that the piston rod 500 is connected to the side of the piston 200 away from the buffer end 310. The piston rod 500 can help the piston 200 maintain the correct position and orientation within the cylinder 100, so that the linear movement of the piston 200 within the cylinder 100 is stable and controllable.
[0074] In a specific implementation, a first earring 120 can be provided at one end of the cylinder body 100, and a second earring 510 can be provided at the end of the piston rod 500. The first earring 120 can be used to fix the cylinder body 100, and the second earring 510 can be used to connect a load or other mechanical components. Exemplarily, the first earring 120 and the second earring 510 can be single earrings, double earrings, or spherical earrings, etc. The first earring 120 can be fixed to the cylinder body 100 by welding, bolting, or other mechanical connection methods; the second earring 510 can also be fixed to the piston rod 500 by welding, bolting, or other mechanical connection methods. This application embodiment does not impose too many limitations on this.
[0075] The cylinder body 100 is also provided with an oil port 130, which is connected to the buffer chamber 110. The oil port 130 provides a channel for hydraulic oil to enter and leave the cylinder body 100. Hydraulic oil can enter one side of the cylinder body 100 through the oil port 130, pushing the piston 200 to move, thereby realizing the extension and retraction function of the hydraulic cylinder.
[0076] In some embodiments, refer to Figure 1 As shown, the piston rod 500 and the buffer component 300 are integrally molded, which reduces the number of connection points and improves the overall strength and rigidity, allowing the piston rod 500 and the buffer component 300 to better withstand the stress and load generated during operation. The integral molding also reduces the need for sealing at the connection points, lowering the possibility of hydraulic oil leakage and thus improving the sealing performance and reliability of the hydraulic system.
[0077] In some embodiments, refer to Figure 1 As shown, the diameter of piston rod 500 is larger than the diameter of buffer 300, and piston 200 abuts against the end of piston rod 500.
[0078] It should be noted that the piston 200 abuts against the end of the piston rod 500, which can improve the sealing performance and reduce the risk of hydraulic oil leakage from the gap between the piston rod 500 and the piston 200.
[0079] The piston rod 500 has a larger diameter than the buffer 300, which allows the piston rod 500 to have higher strength and rigidity, and to better withstand axial loads and working pressures, thus helping to reduce bending and deformation of the piston rod 500 under high load conditions.
[0080] In some embodiments, refer to Figure 3 As shown, the hydraulic device also includes a first seal 600, which is sleeved on the buffer 300 and abuts against the piston 200.
[0081] Specifically, by providing the first seal 600, hydraulic oil leakage between the buffer 300 and the piston 200 can be prevented, thus improving the system's sealing performance and efficiency. It should be noted that the first seal 600 can be a fixed sealing ring, meaning it is fixed between the piston 200 and the buffer 300.
[0082] It should be noted that the first seal 600 can be made of wear-resistant, oil-resistant, and high-temperature-resistant materials, such as fluororubber or polyurethane, to ensure that the first seal 600 maintains good performance. The first seal 600 should fit tightly against the contact surfaces of the buffer 300 and the piston 200. For example, the first seal 600 can be a sealing structure such as an O-ring, U-ring, or V-ring.
[0083] In some embodiments, refer to Figure 3 As shown, the hydraulic device also includes a second seal 700, which is sleeved on the piston 200 and abuts against the inner wall of the cylinder 100.
[0084] Specifically, a second seal 700 is fitted onto the piston 200 to prevent hydraulic oil leakage between the piston 200 and the cylinder 100 (that is, to prevent hydraulic oil leakage between the two cavities inside the cylinder 100), thereby maintaining the pressure difference between the two cavities. It should be noted that the second seal 700 can be a movable sealing ring, meaning that the second sealing ring can move with the piston 200 relative to the inner wall of the cylinder 100.
[0085] For example, the second seal 700 can be an O-ring, U-ring, or V-ring, as long as it can ensure good sealing performance. This application embodiment does not impose too many restrictions on this.
[0086] In some embodiments, refer to Figure 3 As shown, the hydraulic device also includes at least one support member 800, which is disposed between the piston 200 and the cylinder 100.
[0087] It should be noted that the support member 800 can be a support ring, which can guide the piston 200 to make smooth and accurate linear movement of the piston 200 within the cylinder 100. The support ring can also help center the piston 200 and prevent the piston 200 from deviating within the cylinder 100.
[0088] The support member 800 is disposed between the piston 200 and the cylinder 100. The support member 800 reduces the direct contact between the piston 200 and the inner wall of the cylinder 100, thereby reducing friction and wear.
[0089] It should also be noted that the support ring can be made of wear-resistant materials, such as polytetrafluoroethylene, polyamide (nylon), polyurethane or other composite materials, or other materials. This application does not impose too many restrictions on this.
[0090] This application also provides a loader, including a loader body and a hydraulic device disposed on the loader body.
[0091] The specific structure and working method of the hydraulic device have been described in detail in the above embodiments, and will not be repeated here.
[0092] Those skilled in the art will understand that the hydraulic device and loader provided in this application include a cylinder 100, a piston 200, and a buffer 300. The cylinder 100 contains hydraulic oil and has a buffer chamber 110 inside. The piston 200 is disposed within the cylinder 100 and moves under the pressure of the hydraulic oil. The buffer 300 is inserted into the piston 200, with its end extending beyond the piston 200 to form a buffer end 310. The axial section of the buffer end 310 is parabolic, and the apex of the buffer end 310 faces the buffer chamber 110.
[0093] When the piston 200 moves to the end of the cylinder 100, the buffer end 310 moves into the buffer chamber 110. Due to the continuous and gradual change in the curvature of the parabola, the buffer end 310, with its parabolic cross-section, can guide the hydraulic oil to transition smoothly, reducing the impact between the buffer end 310 and the hydraulic oil. Furthermore, since the apex of the buffer end 310 faces the buffer chamber 110, as the stroke of the buffer end 310 increases, the cross-sectional area of the buffer end 310 entering the buffer chamber 110 gradually increases. The resistance of the buffer end 310 to the hydraulic oil within the buffer chamber 110 gradually increases, thus increasing the resistance to the piston 200 and gradually slowing its movement. This achieves a smooth and uniform deceleration of the piston 200, improving the buffering effect of the hydraulic device.
[0094] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0095] It is understood that the various numerical designations used in the embodiments of this application are merely for descriptive convenience and are not intended to limit the scope of the embodiments of this application.
[0096] The technical solutions of this application have been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of this application is obviously not limited to these specific embodiments. Without departing from the principles of this application, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of this application.
Claims
1. A hydraulic device, characterized by, The hydraulic device comprises: a cylinder body, a buffer cavity being arranged in the cylinder body; a piston arranged in the cylinder body; a buffer member arranged on the piston, an end of the buffer member extending out of the piston to form a buffer end, the buffer end having a parabolic cross section, and the vertex of the buffer end being directed towards the buffer cavity.
2. Hydraulic device according to claim 1, characterized in that The buffer cavity has a parabolic cross section, and the opening of the buffer cavity is directed towards the buffer end. When the buffer end is completely moved into the buffer cavity, a gap is formed between the buffer cavity and the buffer end.
3. The hydraulic device of claim 1, wherein The buffer end has a hollow structure.
4. Hydraulic device according to claim 3, characterized in that The buffer end is made of one of cast iron, bronze, steel and organic molecular material.
5. Hydraulic device according to any one of claims 1 to 4, characterized in that The buffer member further comprises a connecting portion, and the connecting portion is connected to the piston by screwing.
6. Hydraulic device according to claim 5, characterized in that The connecting portion further comprises at least one connecting hole, and at least one fastener is connected to the connecting portion through the piston and the connecting hole.
7. Hydraulic device according to any one of claims 1 to 4, characterized in that The buffer member further comprises a first sealing member, and the first sealing member is sleeved on the buffer member and abuts against the piston.
8. Hydraulic device according to claim 7, characterized in that The piston further comprises a second sealing member, and the second sealing member is sleeved on the piston and abuts against the inner wall of the cylinder body.
9. Hydraulic device according to any one of claims 1 to 4, characterized in that The piston further comprises at least one supporting member, and the supporting member is arranged between the piston and the cylinder body.
10. A loader characterized by The hydraulic device is arranged on a loader body. The hydraulic device is arranged on a loader body.