Piston rod and piston conical surface positioning structure for hydraulic cylinder

Abstract

The utility model relates to a piston rod and piston conical surface positioning structure for a hydraulic cylinder, and belongs to the technical field of hydraulic cylinders. Comprising an axial fixing piece, a piston, a piston rod and a guide sleeve, an outer conical surface is machined at the end of the piston rod, an inner conical surface matched with the outer conical surface of the piston rod is machined in an inner hole of the piston, and the piston rod and the piston achieve axial positioning through the matched conical surfaces and are fixed through the axial fixing piece. The utility model has the beneficial effects that the assembly is easy, the positioning precision is high, and the axial impact resistance is realized; the conical surface contact area is greatly increased, and the pressure bearing capacity is improved; stress concentration at the root of the piston is avoided; and the safety and the reliability of the hydraulic cylinder are improved to a great extent.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of piston rod and piston cone surface positioning structure for hydraulic cylinder, belong to hydraulic cylinder technical field. BACKGROUND

[0002] In traditional hydraulic cylinder, piston rod and piston are connected by thread, and positioning mode is through shaft shoulder positioning, but this structure has certain limitations on hydraulic cylinder;It leads to small contact area of piston rod and piston, causes stress concentration of piston root, and is easy to fail. CONTENT OF UTILITY MODEL

[0003] In order to overcome the deficiencies of the prior art, the utility model provides a kind of piston rod and piston cone surface positioning structure for hydraulic cylinder, realizes automatic centering by high-precision taper surface cooperation, and has high rigidity, impact resistance and convenient dismounting characteristics.

[0004] The utility model is realized by the following technical schemes: a kind of piston rod and piston cone surface positioning structure for hydraulic cylinder, including axial fixing piece, piston, piston rod and guide sleeve, the end of the piston rod is processed outer conical surface, the inner hole of the piston is processed with the inner conical surface matched with the outer conical surface of the piston rod, and the piston rod and the piston are axially positioned by the taper surface of mutual cooperation, and are fixed by axial fixing piece.

[0005] The taper angle of the outer conical surface of the end of the piston rod is 5 °-15 °.

[0006] The axial fixing piece is a stop ring.

[0007] The stop ring is made of high-strength spring steel, and radial additional clamping groove is drilled and fixed.

[0008] The guide sleeve is sleeved on the outside of the piston rod.

[0009] The utility model has the advantages of easy assembly, high positioning accuracy and axial impact resistance;The contact area of taper surface is greatly increased, and the pressure bearing capacity is improved;Avoiding stress concentration of piston root;Greatly improve the safety and reliability of hydraulic cylinder. DRAWING DESCRIPTION

[0010] The utility model is further described below according to the drawings and examples.

[0011] Figure 1 It is the structure schematic diagram of the utility model;

[0012] Figure 2 It is the structure schematic diagram of the piston rod of the utility model;

[0013] Figure 3 It is Figure 2 the enlarged view of A of

[0014] Figure 4 is a structural schematic view of the piston of the utility model;

[0015] Figure 5 is Figure 4 an enlarged view of B of

[0016] Figure 6 is a structural schematic view of the stop ring of the utility model.

[0017] In the figure: 1, axial fixing piece; 2, piston; 3, piston rod; 4, guide sleeve. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0019] In the description of the utility model, it needs to be explained that the directions or position relations indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like are the directions or position relations shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and cannot be understood as indicating or implying that the devices or elements indicated must have a particular direction, be constructed and operated in a particular direction, and therefore cannot be understood as limiting the utility model; the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance, and in addition, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0020] As Figures 1 to 6 shown in a kind of hydraulic cylinder piston rod and piston cone surface positioning structure, including axial fixing piece 1, piston 2, piston rod 3 and guide sleeve 4, the end of the piston rod 3 is processed outer conical surface, the inner hole of the piston 2 is processed with the inner conical surface matched with the outer conical surface of the piston rod 3, the piston rod 3 and the piston 2 are realized axial positioning by the conical surface of mutual cooperation, and are fixed by axial fixing piece 1.

[0021] The conical angle of the end outer conical surface of the piston rod 3 is 5-15 degrees, which takes into account the self-locking property and the convenience of disassembly. After the conical surface is matched, the torque is applied axially by the piston thread to compress tightly, and the radial additional clamping groove is provided to install the stop ring fixedly.

[0022] The stop ring is made of high-strength spring steel, and the radial additional clamping groove is provided to install the stop ring fixedly.

[0023] The guide sleeve 4 is sleeved on the outside of the piston rod 3.

[0024] Finally, it should be noted that the above only for the preferred embodiments of the present application, and is not intended to limit the present application, although the foregoing embodiments of the present application have been described in detail, for those skilled in the art, it still can be modified, or part of the technical features of the equivalent replacement, within the spirit and principles of the present application, any modification, equivalent replacement, improvement, etc., should be included within the scope of the present application.

Claims

1. A piston rod and piston cone surface positioning structure for a hydraulic cylinder, characterized in that: It includes an axial fixing component (1), a piston (2), a piston rod (3) and a guide sleeve (4). The end of the piston rod (3) is machined with an outer conical surface, and the inner hole of the piston (2) is machined with an inner conical surface that matches the outer conical surface of the piston rod (3). The piston rod (3) and the piston (2) are axially positioned by the matching conical surfaces and fixed by the axial fixing component (1).

2. The piston rod and piston cone surface positioning structure for a hydraulic cylinder according to claim 1, characterized in that: The cone angle of the outer conical surface at the end of the piston rod (3) is 5°-15°.

3. The piston rod and piston cone surface positioning structure for a hydraulic cylinder according to claim 1, characterized in that: The axial fixing member (1) is a stop ring.

4. The piston rod and piston cone positioning structure for a hydraulic cylinder according to claim 3, characterized in that: The stop ring is made of high-strength spring steel and has radially added grooves for fixing with drills.

5. The piston rod and piston cone positioning structure for a hydraulic cylinder according to claim 1, characterized in that: The guide sleeve (4) is fitted over the piston rod (3).

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