Integrated piston pushrod

Abstract

The utility model relates to the field of piston push rod especially relates to integrated piston push rod, push rod is hollow long column shape, piston is hollow short column shape and diameter is greater than push rod, and push rod and piston between through finish processing integrated casting. In the utility model, through adopting integrated casting process, push rod and piston form seamless whole, eliminate the stress concentration and fatigue crack risk of traditional thread joint, and the connection loose problem caused by vibration is also eliminated, and through the setting of ring cavity, inner chamber and bottom chamber, the structural strength and compression resistance of piston are enhanced, and the overall rigidity, bearing reliability and service life of piston and push rod are improved.

Description

Technical Field

[0001] This utility model relates to the field of piston push rod technology, and in particular to an integrated piston push rod. Background Technology

[0002] In hydraulic and pneumatic transmission systems, the piston push rod, as a core power transmission component, directly determines the performance and service life of the entire actuator through its structural reliability, durability, and manufacturing process. Traditional piston and piston rod assemblies typically employ a split design, where the piston and push rod are two independent parts, fixed together by a threaded connection.

[0003] Pistons and push rods installed via threaded connections have certain disadvantages during long-term use, such as: 1. Stress concentration is easily generated at the root of the thread, especially under high-frequency pulse loads or impact loads, which can easily lead to fatigue cracks and the risk of fracture.

[0004] 2. In environments with prolonged vibration, the threaded connection between the piston and the push rod is prone to loosening. This not only causes abnormal noise and wear, but also increases the error of the equipment. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing an integrated piston push rod.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: An integrated piston push rod includes a push rod and a piston. The push rod is a hollow long cylindrical shape, and the piston is a hollow short cylindrical shape with a diameter larger than that of the push rod. The push rod and the piston are integrally cast by precision machining.

[0007] Furthermore, a preferred structure is that the outer wall of the piston has multiple annular cavities, which are arranged laterally and have two cavities.

[0008] In addition, a preferred structure is that a keyway is provided on the outer side wall of the piston, the keyway being vertically through and communicating with the annular cavity.

[0009] Furthermore, a preferred structure is that the piston has an inner cavity on its inner wall, the inner cavity is annular, and the inner cavity is located between two annular cavities.

[0010] Furthermore, a preferred structure is that the bottom of the piston has multiple upward-facing bottom cavities, which are cylindrical and have eight openings.

[0011] The beneficial effects of this utility model are as follows: by adopting an integral molding casting process, the push rod and piston form a seamless whole, eliminating the stress concentration and fatigue crack risk at the traditional threaded connection, and eliminating the problem of connection loosening caused by vibration. Furthermore, the setting of the annular cavity, inner cavity and bottom cavity enhances the structural strength and pressure resistance of the piston, and improves the overall rigidity, load-bearing reliability and service life of the piston and push rod. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the integrated piston push rod proposed in this utility model; Figure 2 for Figure 1 A schematic diagram of the internal structure of the push rod and piston in the diagram; Figure 3 This is a schematic diagram of the piston structure proposed in this utility model; Figure 4 This is a schematic diagram of the push rod and piston in the prior art.

[0013] In the diagram: 1 push rod, 2 piston, 21 ring cavity, 22 inner cavity, 23 bottom cavity, 24 keyway. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0015] See Figure 1-3 The integrated piston push rod includes a push rod 1 and a piston 2. The push rod 1 is a hollow long cylindrical shape, and the piston 2 is a hollow short cylindrical shape with a diameter larger than that of the push rod 1. The push rod 1 and the piston 2 are integrally cast by precision machining.

[0016] During the manufacturing process, an alloy steel bar with a diameter larger than the finished product is used directly. Forging technology is employed on a forging press using a die to directly forge and extrude one end of the bar into the rough shape of the piston. Subsequently, forging, heat treatment, and machining processes such as turning and grinding are used to achieve the integral casting of push rod 1 and piston 2. This integral casting method eliminates the need for threaded connections between push rod 1 and piston 2, thus overcoming the risk of thread breakage and loosening that occurs with traditional threaded connections under extreme vibration conditions.

[0017] The piston 2 has multiple annular cavities 21 on its outer side wall. The annular cavities 21 are arranged laterally and there are two of them. The arrangement of the annular cavities 21 can improve the strength of the piston 2, thereby increasing the compressive strength that the piston 2 can withstand when subjected to lateral forces, and thus improving the service life of the piston 2.

[0018] The piston 2 has a keyway 24 on its outer side wall. The keyway 24 is vertically through and communicates with the annular cavity 21. The keyway 24 enables the transmission connection between the piston 2 and the transmission assembly. It is worth noting that the keyway 24 is prior art, common knowledge known to those skilled in the art, and is not a major technical problem to be solved in this invention; therefore, it will not be described in detail here.

[0019] The piston 2 has an inner cavity 22 on its inner wall. The inner cavity 22 is annular and is located between two annular cavities 21. The inner cavity 22 further improves the piston 2's compressive strength under lateral force, thereby increasing the service life of the piston 2.

[0020] The piston 2 has multiple bottom cavities 23 with an upward opening at its bottom. Each bottom cavity 23 is cylindrical and has eight openings.

[0021] See Figure 4 , Figure 4 In existing technologies, the push rod 1 and piston 2 are fixedly connected by an adaptive meshing of external threads and internal threaded grooves. During long-term use, vibration can easily cause the threaded connection to loosen or break. However, this application utilizes an integrated molding design, eliminating the threaded connection between the push rod 1 and piston 2, thus avoiding the risk of loosening or breakage at the threaded connection.

[0022] In this embodiment, during the processing, an alloy steel bar with a diameter larger than that of the finished product is used directly, and one end of the bar is forged and extruded into a rough piston shape on a forging press using a die through forging forming technology.

[0023] Subsequently, the push rod 1 and piston 2 are integrally cast through forging, heat treatment, and machining processes such as turning and grinding. This integral casting method eliminates the need for threaded connection between the push rod 1 and piston 2, thus overcoming the risk of thread breakage and loosening at the threaded joints under extreme vibration environments, which is common with traditional threaded connections.

[0024] Furthermore, during processing, by machining the annular cavity 21, the inner cavity 22 and the bottom cavity 23, the compressive strength of the piston 2 can be increased, thereby improving the service life of the piston 2.

[0025] In this invention, by adopting an integral casting process, the push rod 1 and the piston 2 are made into a seamless whole, eliminating the stress concentration and fatigue crack risk at the traditional threaded connection, and eliminating the problem of loose connection caused by vibration. Furthermore, by setting the annular cavity 21, inner cavity 22 and bottom cavity 23, the structural strength and compressive strength of the piston 2 are enhanced, and the overall rigidity, load-bearing reliability and service life of the piston 1 and the push rod 2 are improved.

[0026] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. An integrated piston push rod, comprising a push rod (1) and a piston (2), characterized in that, The push rod (1) is a hollow long column, and the piston (2) is a hollow short column with a diameter larger than that of the push rod (1). The push rod (1) and the piston (2) are integrally cast by precision machining.

2. The integrated piston push rod according to claim 1, characterized in that, The piston (2) has multiple annular cavities (21) on its outer side wall. The annular cavities (21) are arranged laterally and have two openings.

3. The integrated piston push rod according to claim 2, characterized in that, The piston (2) has a keyway (24) on its outer side wall. The keyway (24) is vertically through and communicates with the annular cavity (21).

4. The integrated piston push rod according to claim 2, characterized in that, The piston (2) has an inner cavity (22) on its inner wall. The inner cavity (22) is annular and is located between two annular cavities (21).

5. The integrated piston push rod according to claim 1, characterized in that, The piston (2) has multiple bottom cavities (23) opening upwards at its bottom. The bottom cavities (23) are cylindrical and have eight openings.

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