Lightweight piston rod and piston rod assembly

Abstract

A lightweight piston rod and a piston rod assembly relate to the technical field of piston rods. The light-weight piston rod comprises a rod body and two metal connectors connected to the two ends of the rod body respectively, the outer layer of the rod body is a metal layer, the inner layer of the rod body is a fiber composite material layer, the fiber composite material layer is composed of a small-angle fiber composite material layer and a large-angle fiber composite material layer according to a specific layer laying structure, and the rod body has the advantages of being light in weight, high in strength and good in abrasion resistance. Wherein the layer paving structure of the fiber composite layer can be flexibly adjusted in the production process, so that the mechanical property requirements of different products can be quickly responded, the manufacturing difficulty is effectively reduced, and the production efficiency is improved; the metal joints are mechanically meshed with the fiber composite material layer through the micro-convex bodies on the outer surfaces, connection is quite stable, the two metal joints can be used for being connected with the piston joint and the thrust rod joint respectively, then connection with a piston and a thrust rod is achieved through the piston joint and the thrust rod joint, and the connection mode has the advantages of being reliable in connection and easy and convenient to operate.

Description

Technical Field

[0001] This application relates to the field of piston rod technology, specifically to a lightweight piston rod and piston rod assembly. Background Technology

[0002] The piston rod is a key connecting component that supports the piston in performing work, and it is widely used in hydraulic cylinders, pneumatic cylinders, and other motion actuators. As a component with frequent movement and high technical requirements, the piston rod has strict requirements for properties such as coaxiality, strength, and wear resistance. Traditional piston rods are usually made of steel, which, while meeting the requirements for strength and wear resistance, is relatively heavy. This brings many limitations in practical applications, such as increasing the overall weight of the equipment, reducing energy efficiency, and failing to meet the ever-increasing lightweight requirements of modern machinery. Furthermore, the structural design of traditional piston rods lacks flexibility and cannot be adjusted during production according to the mechanical performance requirements of different products. In addition, piston rods typically use adhesive bonding or pin connections to connect the piston joint and thrust rod joint, which suffer from unreliable connections and complex manufacturing processes. Utility Model Content

[0003] In view of this, the purpose of this application is to provide a lightweight piston rod and piston rod assembly to solve at least one of the above-mentioned technical problems.

[0004] In a first aspect, this application provides a lightweight piston rod, comprising: a rod body, including an outer metal layer and an inner fiber composite layer, the metal layer providing wear-resistant protection, the fiber composite layer comprising stacked small-angle fiber composite layers and large-angle fiber composite layers, the small-angle fiber composite layers bearing the axial load on the rod body, and the large-angle fiber composite layers bearing the pressure of the working medium in the hydraulic cylinder or air cylinder, the layering structure of the fiber composite layers being: n*(a*large-angle fiber composite layer + b*small-angle fiber composite layer) + a*large-angle fiber composite layer, where a represents the number of large-angle fiber composite layers, b represents the number of small-angle fiber composite layers, and n represents the number of repetitions; two metal joints, respectively connected to both ends of the rod body for connecting other connectors, the outer surface of the metal joints having multiple micro-protrusions, the metal joints mechanically engaging with the fiber composite layers through the multiple micro-protrusions.

[0005] In conjunction with the first aspect, in some optional embodiments, the ratio of the total number of large-angle fiber composite layers to the total number of small-angle fiber composite layers is 1:2 to 1:4.

[0006] In conjunction with the first aspect, in some alternative embodiments, the gap D of the micro-protrusions is 0.8N*M~1.2N*M, where N represents the number of fiber bundles used in the winding process of a single layer of large / small angle fiber composite material, and M represents the width of each fiber bundle.

[0007] In conjunction with the first aspect, in some optional embodiments, the micro-protrusion is a cylinder perpendicular to the outer surface of the metal joint, and the diameter of the micro-protrusion is d = 0.12D~0.18D, where D represents the gap of the micro-protrusion.

[0008] In conjunction with the first aspect, in some alternative implementations, the height of the micro-protrusions is equal to the thickness of the fiber composite layer.

[0009] In conjunction with the first aspect, in some alternative implementations, the metal joint is embedded within the fiber composite layer.

[0010] In conjunction with the first aspect, in some alternative embodiments, the fiber angle of the small-angle fiber composite layer is 0° to 30°.

[0011] In conjunction with the first aspect, in some alternative embodiments, the fiber angle of the large-angle fiber composite layer is 45° to 90°.

[0012] In conjunction with the first aspect, in some alternative embodiments, a piston joint and a thrust rod joint are also included, which are respectively connected to two metal joints.

[0013] Secondly, this application provides a piston rod assembly, including a piston and the lightweight piston rod described in the first aspect above, wherein the piston is mounted on a piston joint of the lightweight piston rod.

[0014] Based on the above technical solution, the lightweight piston rod and piston rod assembly provided in this application include a rod body and two metal joints. The outer layer of the rod body is a metal layer, providing excellent wear-resistant protection. The inner layer of the rod body is a fiber composite layer, which is composed of small-angle and large-angle fiber composite layers arranged in a specific layered structure. This structure achieves lightweighting while ensuring high strength. Furthermore, because its layered structure can be flexibly adjusted during production, it can quickly respond to the mechanical performance requirements of different products, effectively reducing manufacturing difficulty and improving production efficiency. The metal joints mechanically engage with the fiber composite layer through multiple micro-protrusions on their outer surface, resulting in a very stable connection. The two metal joints can be used to connect the piston joint and the thrust rod joint, respectively, thereby achieving connection with the piston and thrust rod. This connection method features reliable connection and simple operation. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a cross-sectional schematic diagram of a lightweight piston rod provided in an embodiment of this application.

[0017] Figure 2 This is a schematic diagram of the structure of a metal connector provided in an embodiment of this application.

[0018] Figure 3 This is a partial structural schematic diagram of a lightweight piston rod provided in an embodiment of this application.

[0019] Figure 4 This is a schematic diagram of another lightweight piston rod provided in an embodiment of this application.

[0020] Figure 5 An exploded view of another lightweight piston rod provided in an embodiment of this application.

[0021] Figure 6 This is a schematic diagram of a piston rod assembly provided in an embodiment of this application.

[0022] Reference numerals: 100, lightweight piston rod; 10, rod body; 11, metal layer; 12, fiber composite layer; 20, metal joint; 21, micro-protrusion; 30, piston joint; 40, thrust rod joint; 200, piston; 1000, piston rod assembly. Detailed Implementation

[0023] The specific embodiments of this application will now be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are merely a part of the embodiments of this application, and not all of them. Based on the description of this application, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this application.

[0024] In the description of this application, unless otherwise expressly specified and limited, the terms "connection," "setup," "installation," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can refer to the internal connection 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.

[0025] The terms “upper,” “lower,” “left,” “right,” “front,” “back,” “center,” “top,” “bottom,” “inner,” “outer,” “vertical,” “horizontal,” “clockwise,” “counterclockwise,” “axial,” “radial,” and “circumferential” indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of description and simplification, 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.

[0026] The terms “first,” “second,” “third,” etc., are used only to distinguish elements with similar properties, and do not indicate or imply relative importance or a specific order, unless otherwise explicitly stated or limited.

[0027] The terms “comprising,” “including,” “having,” or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase “comprising one…” does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0028] The term "multiple" means two or more (including two).

[0029] The term "and / or" describes the relationship between related objects, indicating that there can be three relationships. For example, A and / or B can represent three cases: A exists alone, A and B exist simultaneously, and B exists alone.

[0030] The terms "an embodiment," "as an example," and "in one implementation" refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which may be included in at least one embodiment or example of this application. These illustrative expressions do not necessarily refer to the same embodiment, nor are they independent or alternative embodiments mutually exclusive with other embodiments. Where there is no conflict, the embodiments and features described in these embodiments can be combined in a suitable manner.

[0031] Figure 1 A cross-sectional schematic diagram of a lightweight piston rod 100 provided in this application embodiment is shown below. Figure 1 As shown, this application provides a lightweight piston rod 100, including a rod body 10 and two metal joints 20 located at both ends of the rod body 10.

[0032] The rod 10 is a hollow structure with both ends open, and the rod 10 has a multi-layer structure, including an outer metal layer 11 and an inner fiber composite layer 12.

[0033] The metal layer 11 primarily serves a wear-resistant protective function. The metal layer 11 can be made of wear-resistant high-strength steel, aluminum alloy, magnesium alloy, etc. The thickness, hardness, and other parameters of the metal layer 11 are determined based on the specific design.

[0034] As an example, the metal layer 11 is a wear-resistant high-strength steel layer. Wear-resistant high-strength steel has excellent comprehensive performance, especially in terms of hardness, wear resistance, strength and heavy load resistance, which are significantly superior to other metals such as aluminum alloys and magnesium alloys. It is more suitable for the rod 10 that needs to withstand heavy loads, high pressure and harsh working conditions.

[0035] The fiber composite layer 12 mainly bears the axial load on the rod 10 and the pressure of the working medium in the hydraulic cylinder or air cylinder.

[0036] The fiber composite layer 12 includes a small-angle fiber composite layer and a large-angle fiber composite layer (neither shown in the figure). The small-angle fiber composite layer mainly bears the axial load on the rod 10, and the fiber angle (the angle between the fiber axis and the axis of the rod 10) of the small-angle fiber composite layer is 0°~30°. The large-angle fiber composite layer mainly bears the pressure of the working medium in the hydraulic cylinder or air cylinder, and the fiber angle (the angle between the fiber axis and the axis of the rod 10) of the large-angle fiber composite layer is 45°~90°.

[0037] The fiber composite layer 12 is composed of layers of small-angle and large-angle fiber composite materials. The layup structure of the fiber composite layer 12 can be expressed by the formula: n * (a * large-angle fiber composite layer + b * small-angle fiber composite layer) + a * large-angle fiber composite layer, where a represents the number of large-angle fiber composite layers, b represents the number of small-angle fiber composite layers, and n represents the number of repetitions. This formula indicates that a basic unit is formed by a large-angle fiber composite layer and b small-angle fiber composite layers, which are repeated n times, and finally, an additional large-angle fiber composite layer is laid. By adjusting the parameters a, b, and n in the formula as needed, the fiber composite layer 12 can meet different mechanical performance requirements, providing excellent flexibility and efficiency in production.

[0038] Based on the axial load on the rod 10 and the pressure distribution of the working medium in the hydraulic cylinder or air cylinder, preferably, the ratio of the total number of large-angle fiber composite layers to the total number of small-angle fiber composite layers is 1:2 to 1:4.

[0039] As an example, with a=1, b=3, and n=3, the layup structure of the fiber composite layer 12 is: 3 * (1 * large-angle fiber composite layer + 3 * small-angle fiber composite layer) + 1 * large-angle fiber composite layer. That is, a basic unit is formed by one large-angle fiber composite layer and three small-angle fiber composite layers, repeated three times, and finally, one additional large-angle fiber composite layer is laid. The ratio of the total number of large-angle fiber composite layers to the total number of small-angle fiber composite layers is 4:9. The fiber composite layer 12 laid according to this structure has good mechanical properties and can better withstand the axial load on the rod 10 and the pressure of the working medium inside the hydraulic cylinder or pneumatic cylinder.

[0040] Fiber composites, also known as fiber-reinforced resin-based composites, are composite materials that use fibers as reinforcement and resin as the matrix. The fibers can be carbon fiber, glass fiber, aramid fiber, etc., and the resin can be epoxy resin, unsaturated resin, phenolic resin, etc. The specifications and types of fibers and resins depend on the specific design.

[0041] As an example, both the small-angle fiber composite layer and the large-angle fiber composite layer are carbon fiber reinforced epoxy resin matrix composite layers. Compared with other fibers such as glass fiber and aramid fiber, carbon fiber has higher strength and modulus, as well as better thermal stability and corrosion resistance. This makes carbon fiber perform excellently under high loads and complex stress environments, making it very suitable for use in the rod 10, which has extremely high material performance requirements. Epoxy resin, compared with other resins such as unsaturated resin and phenolic resin, has superior bonding performance and mechanical strength after curing, as well as good chemical corrosion resistance and electrical insulation. These properties make epoxy resin an ideal resin matrix, which can effectively bring out the high performance of carbon fiber and further enhance the overall performance of the rod 10.

[0042] Two metal joints 20 are respectively connected to both ends of the rod 10. The metal joints 20 mainly serve a connecting function. They are used to connect other connecting parts, such as piston joints, thrust rod joints, etc., so as to effectively transmit the axial load on the rod 10. The connection method can be threaded connection, welded connection or other connection methods.

[0043] As an example, both metal connectors 20 are pre-embedded in the fiber composite layer 12. Pre-embedding means placing the metal connectors 20 in a predetermined position and fixing them therein as the fiber composite layer 12 is laid.

[0044] To improve the connection performance between the metal connector 20 and the fiber composite layer 12, as an example, Figure 2 This is a schematic diagram of the structure of a metal connector 20 provided in an embodiment of this application. Figure 3 A partial structural schematic diagram of a lightweight piston rod 100 provided in an embodiment of this application is shown below. Figure 2 and Figure 3 As shown, the outer surface of the metal connector 20 is covered with a plurality of micro-protrusions 21. These micro-protrusions 21 protrude from the outer surface of the metal connector 20. Exemplarily, these micro-protrusions 21 can be perpendicular to corresponding positions on the outer surface of the metal connector 20. These micro-protrusions 21 can be protrusions, pins, dots, etc., as long as these micro-protrusions 21 can increase the mechanical interlocking effect with the fiber composite layer 12 and significantly improve the connection performance between the metal connector 20 and the fiber composite layer 12. The shape, number, distribution spacing, and other parameters of the micro-protrusions 21 are determined according to the specific design.

[0045] Furthermore, as an example, the micro-convexity 21 is a cylinder.

[0046] The gaps between the micro-protrusions 21 affect the bonding strength between the fiber composite layer 12 and the metal connector 20, as well as the uniformity of the fiber composite layer 12. Smaller gaps result in higher bonding strength but lower uniformity. Therefore, the gaps between the micro-protrusions 21 need to be within a reasonable range. Preferably, the gap D of the micro-protrusions 21 is 0.8N*M to 1.2N*M, where N represents the number of fiber bundles used in the winding process of a single layer of large / small angle fiber composite layer, and M represents the width of each fiber bundle.

[0047] The diameter of the micro-protrusion 21 affects the bonding strength between the micro-protrusion 21 and the metal connector 20, as well as the uniformity of the fiber composite layer 12. A larger diameter results in a stronger bonding strength between the micro-protrusion 21 and the metal connector 20, but also worse uniformity of the fiber composite layer 12. Therefore, the diameter of the micro-protrusion 21 needs to be within a reasonable range. Preferably, the diameter d of the micro-protrusion 21 is 0.12D~0.18D, where D represents the gap between the micro-protrusions 21.

[0048] The height of the micro-protrusion 21 is equal to the thickness of the fiber composite layer 12, which can satisfy the high-strength bonding between the fiber composite layer 12 and the metal joint 20, and also ensure the surface quality of the fiber composite layer 12.

[0049] The metal connector 20 can be a high-strength steel connector, an aluminum alloy connector, a magnesium alloy connector, etc. The dimensions and other parameters of the metal connector 20 are determined according to the specific design.

[0050] As an example, metal joint 20 is a high-strength steel joint. Compared to other metals such as aluminum alloys and magnesium alloys, high-strength steel has higher strength and toughness, which makes high-strength steel joints perform excellently under conditions of heavy loads and complex stresses. High-strength steel has excellent mechanical properties, especially in tensile strength, yield strength, and fatigue life, ensuring that high-strength steel joints provide reliable strength and durability when connecting rod 10 and other components. In addition, high-strength steel also has good corrosion resistance and wear resistance, maintaining the stability and service life of high-strength steel joints in a variety of harsh environments, making it more suitable for applications requiring high strength, high reliability, and long service life.

[0051] Figure 4 This is a schematic diagram of another lightweight piston rod 100 provided in an embodiment of this application. Figure 5 An exploded view of another lightweight piston rod 100 provided in an embodiment of this application is shown below. Figure 4 and Figure 5 As shown, the lightweight piston rod 100 may also include a piston joint 30 and a thrust rod joint 40. The piston joint 30 and the thrust rod joint 40 are respectively connected to two metal joints 20. The piston joint 30 is used to connect the piston, and the thrust rod joint 40 is used to connect the thrust rod.

[0052] Figure 6 This is a schematic diagram of the structure of a piston rod assembly 1000 provided in an embodiment of this application, as shown below. Figure 6 As shown, this application embodiment also provides a piston rod assembly 1000, which includes the aforementioned lightweight piston rod 100 and piston 200, wherein piston 200 is mounted on piston joint 30.

[0053] In summary, the lightweight piston rod and piston rod assembly provided in this application include a rod body and two metal joints. The outer layer of the rod body is a metal layer, providing excellent wear-resistant protection. The inner layer of the rod body is a fiber composite layer, which is composed of small-angle and large-angle fiber composite layers arranged in a specific layered structure. This structure achieves lightweighting while ensuring high strength. Furthermore, because its layered structure can be flexibly adjusted during production, it can quickly respond to the mechanical performance requirements of different products, effectively reducing manufacturing difficulty and improving production efficiency. The metal joints mechanically engage with the fiber composite layer through multiple micro-protrusions on their outer surface, resulting in a very stable connection. The two metal joints can be used to connect the piston joint and the thrust rod joint, respectively, thereby achieving connection with the piston and thrust rod. This connection method is characterized by reliable connection and simple operation.

[0054] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various variations or substitutions within the technical scope disclosed in this application, and these should all be included within the scope of protection of this application.

Claims

1. A lightweight piston rod, characterized in that, include: The rod body includes an outer metal layer and an inner fiber composite layer. The metal layer provides wear-resistant protection. The fiber composite layer includes stacked small-angle fiber composite layers and large-angle fiber composite layers. The small-angle fiber composite layers bear the axial load on the rod body, and the large-angle fiber composite layers bear the pressure of the working medium in the hydraulic cylinder or air cylinder. The layering structure of the fiber composite layer is: n*(a*large-angle fiber composite layer + b*small-angle fiber composite layer) + a*large-angle fiber composite layer, where a represents the number of large-angle fiber composite layers, b represents the number of small-angle fiber composite layers, and n represents the number of repetitions. Two metal connectors are respectively connected to the two ends of the rod body for connecting other connectors. The outer surface of the metal connectors is distributed with multiple micro-protrusions, and the metal connectors are mechanically engaged with the fiber composite layer through the multiple micro-protrusions.

2. The lightweight piston rod according to claim 1, characterized in that, The ratio of the total number of large-angle fiber composite layers to the total number of small-angle fiber composite layers is 1:2 to 1:

4.

3. The lightweight piston rod according to claim 1, characterized in that, The gap D of the micro-protrusion is 0.8N*M~1.2N*M, where N represents the number of fiber bundles used in the winding process of a single layer of large / small angle fiber composite material, and M represents the width of each fiber bundle.

4. The lightweight piston rod according to claim 3, characterized in that, The micro-protrusion is a cylinder perpendicular to the outer surface of the metal connector, and the diameter of the micro-protrusion is d = 0.12D~0.18D, where D represents the gap of the micro-protrusion.

5. The lightweight piston rod according to claim 1, characterized in that, The height of the micro-protrusion is equal to the thickness of the fiber composite layer.

6. The lightweight piston rod according to claim 1, characterized in that, The metal joint is embedded in the fiber composite layer.

7. The lightweight piston rod according to claim 1, characterized in that, The fiber angle of the small-angle fiber composite layer is 0°~30°.

8. The lightweight piston rod according to claim 1, characterized in that, The fiber angle of the large-angle fiber composite layer is 45°~90°.

9. The lightweight piston rod according to any one of claims 1-8, characterized in that, It also includes a piston joint and a thrust rod joint, which are respectively connected to the two metal joints.

10. A piston rod assembly, characterized in that, It includes a piston and a lightweight piston rod as described in claim 9, wherein the piston is mounted on a piston joint of the lightweight piston rod.

Images