Hydraulic cylinder with piston anti-loosening structure and movement assembly

Abstract

The utility model discloses a hydraulic cylinder with a piston anti-loosening structure and a movement assembly. The hydraulic cylinder comprises a piston rod, a piston, a nut and an anti-loosening component, one end of the piston rod is of a multi-step structure. The piston sleeves the multi-stage step structure of the piston rod, and the piston is prevented from axially moving inwards under the action of steps; the nut is screwed on the multi-stage step structure of the piston rod until the nut is attached to the piston, and the nut is used for preventing the piston from axially moving outwards; and the anti-loosening part acts in the nut and the piston rod and is used for preventing the nut from axially moving outwards after the nut circumferentially rotates relative to the piston rod. According to the utility model, the anti-loosening reliability problem of the piston of the heavy hydraulic cylinder under the working condition of high-frequency vibration impact is solved.

Description

Technical Field

[0001] The utility model relates to a hydraulic cylinder with a piston anti-loosening structure, belonging to the technical field of hydraulic cylinders. Background Art

[0002] Currently, domestic and international mining loaders and excavators (hydraulic cylinders subject to high impact loads) generally use a saddle screw structure to prevent piston loosening. However, the reliability of piston loosening is significantly different from that of international benchmark products, and generally fails to meet the specifications of similar international benchmark products. The main reported problem is that after long-term operation under high impact load conditions, the piston is prone to fall off, causing cylinder barrel strain and cylinder failure.

[0003] The existing patent (authorization announcement number CN205089720U) discloses a piston and piston rod anti-loosening connection structure, a piston cylinder, and a machine. However, the disclosed technical solution has the following deficiencies:

[0004] (1) The hole in the side wall of the blind hole of the saddle pin has extremely poor manufacturability in actual production and manufacturing, and its structure is unreasonable and inconvenient to process.

[0005] (2) The blocking component is a curved filamentous component. Under the action of high-frequency and high-impact loads, its reliability is obviously insufficient and it is easily damaged. Its anti-loosening reliability cannot meet the working conditions. Summary of the Invention

[0006] In view of the deficiencies in the prior art, the utility model provides a hydraulic cylinder with a piston anti-loosening structure, which solves the problem of piston anti-loosening reliability of heavy hydraulic cylinders under high-frequency vibration and impact working conditions.

[0007] The utility model is implemented according to the following technical solutions:

[0008] In a first aspect, the utility model provides a hydraulic cylinder with a piston anti-loosening structure, comprising:

[0009] A piston rod, one end of which is provided with a multi-step structure;

[0010] A piston is sleeved on the multi-step structure of the piston rod and prevents the piston from moving axially inward under the action of the steps;

[0011] A nut is screwed onto the multi-step structure of the piston rod until it fits against the piston, and is used to prevent the piston from moving outward axially;

[0012] The anti-loosening component acts on the nut and the piston rod to prevent the nut from moving axially outward after rotating circumferentially relative to the piston rod.

[0013] In some embodiments, the piston rod has a coaxial three-step structure at the connecting end that cooperates with the nut and the piston; the first-step structure of the piston rod is an optical axis that cooperates with the piston; the second-step structure of the piston rod is a threaded shaft that cooperates with the nut; the third-step structure of the piston rod is an optical axis having an outer circular groove that cooperates with the radial anti-loosening component.

[0014] In some embodiments, the anti-loosening component is inserted vertically inward from the radial outer circumference of the nut until a portion of the anti-loosening component enters into the piston rod.

[0015] In some embodiments, a radial threaded hole is provided on the nut. When the nut is in contact with the piston, an outer circular groove coaxial with the radial threaded hole is provided on the piston rod. A portion of the anti-loosening component is located in the outer circular groove, and another portion of the loosening component is fastened in the radial threaded hole.

[0016] In some embodiments, the anti-loosening component includes:

[0017] a cylindrical pin, a portion of which falls into the outer circular groove and another portion of which is located in the radial threaded hole;

[0018] The set screw is screwed into the radial threaded hole, pushing the cylindrical pin downward to tighten it in the outer circular groove, and the bottom surface protrusion of the set screw is inserted into the top surface groove of the cylindrical pin.

[0019] In some embodiments, a layer of anti-loosening glue is applied to the outer thread surface of the set screw to adhere the set screw and the nut together to prevent loosening.

[0020] In some embodiments, the set screw can be completely inserted into the radial threaded hole of the nut, and the top surface of the set screw is lower than the radial outer peripheral surface of the nut. Punching points are performed around the outer port of the radial threaded hole, so that the outer port of the radial threaded hole is deformed and contracted, limiting the set screw in the radial threaded hole to prevent loosening.

[0021] In some embodiments, a plurality of punching points are performed around the outer end of the radial threaded hole at uniform intervals along the entire circumference.

[0022] In some embodiments, a connection between the nut and the piston rod is provided with a plurality of evenly spaced loosening components along the entire circumference.

[0023] In a second aspect, the present invention provides a motion assembly, comprising a first component and a second component, wherein the hydraulic cylinder with the piston anti-loosening structure is hingedly connected between the first component and the second component.

[0024] Beneficial effects of the utility model:

[0025] The utility model provides a hydraulic cylinder with a piston anti-loosening structure, which is provided with a multi-stage nut anti-loosening structure and can effectively ensure the anti-loosening reliability of the hydraulic cylinder piston under high-frequency vibration and impact working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings are part of this utility model and are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. Obviously, the drawings described below are only some embodiments. For those of ordinary skill in the art, other drawings can be derived from these drawings without inventive effort.

[0027] In the attached figure:

[0028] Figure 1 This is a partial cross-sectional view of a hydraulic cylinder with a piston anti-loosening structure according to the present utility model;

[0029] Figure 2 for Figure 1 A magnified view of part I in FIG;

[0030] Figure 3 for Figure 2 A-direction schematic diagram in .

[0031] Figure symbols: 1. Nut; 2. Piston; 3. Piston rod; 4. Set screw; 5. Cylindrical pin.

[0032] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but rather to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0034] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0035] In the description of this utility model, it should be noted that, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; and direct connections or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances.

[0036] like Figure 1 As shown, a hydraulic cylinder with a piston anti-loosening structure includes a piston rod 3, a piston 2, a nut 1 and an anti-loosening component; one end of the piston rod 3 is provided with a multi-step step structure; the piston 2 is sleeved on the multi-step step structure of the piston rod 3, and under the action of the steps, the piston 2 is prevented from moving axially inward; the nut 1 is screwed on the multi-step step structure of the piston rod 3 until it fits with the piston 2, and is used to prevent the piston 2 from moving axially outward; the anti-loosening component acts on the nut 1 and the piston rod 3, and is used to prevent the nut 1 from moving axially outward after rotating circumferentially relative to the piston rod 3.

[0037] The above-mentioned piston rod is further described below.

[0038] Continue to refer to Figure 1 As shown, the piston rod 3 has a coaxial three-step structure at the connecting end that cooperates with the nut 1 and the piston 2; the first-step structure of the piston rod 3 is an optical axis that cooperates with the piston 2; the second-step structure of the piston rod 3 is a threaded shaft that cooperates with the nut 1; the third-step structure of the piston rod 3 is an optical axis with an outer circular groove that cooperates with the radial anti-loosening component.

[0039] The above-mentioned anti-loosening component is further described below.

[0040] Continue to refer to Figure 1 As shown, the anti-loosening component is inserted vertically inward from the radial outer peripheral surface of the nut 1 until a portion of the anti-loosening component enters into the piston rod 3.

[0041] For further solutions, please refer to Figure 1 As shown, a radial threaded hole is provided on the nut 1. When the nut 1 is fitted with the piston 2, an outer circular groove coaxial with the radial threaded hole is opened on the piston rod 3; a part of the anti-loosening component is located in the outer circular groove, and the other part of the loosening component is fastened in the radial threaded hole.

[0042] Further solutions, such as Figure 2 As shown, the anti-loosening component includes a cylindrical pin 5 and a set screw 4; a part of the cylindrical pin 5 falls into the outer circular groove, and the other part is located in the radial threaded hole; the set screw 4 is screwed into the radial threaded hole, pushing the cylindrical pin 5 downward to tighten it in the outer circular groove, and the bottom surface protrusion of the set screw 4 is inserted into the top surface groove of the cylindrical pin 5.

[0043] It should be noted that the width of the outer circular groove on the piston rod 3 is 0.5mm-1mm larger than the diameter of the cylindrical pin 5; the top surface groove of the cylindrical pin 5 is provided with an internal thread, which is convenient for disassembling and assembling the cylindrical pin 5 with a wrench.

[0044] For further solutions, please refer to Figure 2 As shown, a layer of anti-loosening glue is applied on the outer thread surface of the set screw 4, which is used to adhere the set screw 4 and the nut 1 together to prevent loosening.

[0045] Further solutions, such as Figure 3 As shown, the set screw 4 can be completely inserted into the radial threaded hole of the nut 1, and the top surface of the set screw 4 is lower than the radial outer peripheral surface of the nut 1. Punching points are performed around the outer end of the radial threaded hole, so that the outer end of the radial threaded hole is deformed and contracted, limiting the set screw 4 in the radial threaded hole to prevent loosening.

[0046] For further solutions, please refer to Figure 3 As shown, multiple punching points are evenly spaced along the entire circumference around the outer end of the radial threaded hole.

[0047] It should be noted that the top surface of the set screw 4 is 2 mm lower than the radial outer circumference of the nut 1. The inner diameter of the radial threaded hole is M. On the outer port of the radial threaded hole, with the center of the radial threaded hole as the center, four points are punched at 90 degrees on a circle with a punching point diameter of (M+2) mm to ensure that the outer port of the radial threaded hole of the nut 1 is deformed, thereby pressing the set screw 4 to prevent it from withdrawing, further playing an anti-loosening role.

[0048] For further solutions, please refer to Figure 1 As shown, the connection between the nut 1 and the piston rod 3 is provided with a plurality of evenly spaced loosening parts along the entire circumference.

[0049] The following is the installation process of the hydraulic cylinder with piston anti-loosening structure:

[0050] Continue to refer to Figure 1As shown, 1. Piston 2 is installed on piston rod 3. 2. Nut 1 is threaded onto piston rod 3 and tightened against piston 2, with the tightening torque meeting technical requirements. 3. Cylindrical pin 5 is installed through the radial threaded hole in nut 1 and into nut 1, with its end inserted into the outer groove on piston rod 3 and tightened. 4. Loctite 243 anti-loosening adhesive is applied to the outer thread of set screw 4. 5. Set screw 4 is screwed into the radial thread of nut 1 and tightened against the top of cylindrical pin 5, with the top of set screw 4 2 mm away from the outer surface of nut 1. 6. On the outer end of the radial threaded hole, four points are punched at 90-degree intervals on a circle with a punch point diameter of (M+2) mm, centered on the center of the radial threaded hole. This ensures that the outer end of the radial threaded hole in nut 1 is deformed, thereby compressing set screw 4 and preventing it from withdrawing, further preventing it from loosening. These measures effectively ensure the anti-loosening reliability of the hydraulic cylinder piston under vibration and impact conditions.

[0051] The motion assembly provided by the present invention is described below. The motion assembly described below and the hydraulic cylinder with a piston anti-loosening structure described above can be referred to each other.

[0052] The utility model provides a motion assembly, which comprises a first component and a second component, wherein the hydraulic cylinder with the piston anti-loosening structure is hinged between the first component and the second component.

[0053] The beneficial effects achieved by the motion assembly provided by the present invention are consistent with the beneficial effects achieved by the hydraulic cylinder with a piston anti-loosening structure provided by the present invention, and will not be described in detail here.

[0054] In the description provided herein, numerous specific details are described. However, it is understood that embodiments of the present invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques are not shown in detail so as not to obscure the understanding of this description.

[0055] Furthermore, those skilled in the art will appreciate that, although some embodiments described herein include certain features included in other embodiments but not other features, combinations of features from different embodiments are also intended to fall within the scope of protection of the present invention and form different embodiments. For example, in the above embodiments, those skilled in the art will be able to use them in combination based on the known technical solutions and the technical problems to be solved by this application.

[0056] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment, it is not intended to limit the present invention. Any technician familiar with this patent can make some changes or modifications to equivalent embodiments using the above-mentioned technical content without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the solution of the present invention.

Claims

1. A hydraulic cylinder with a piston anti-loosening structure, characterized in that: include: A piston rod, one end of which is provided with a multi-step structure; A piston is sleeved on the multi-step structure of the piston rod and prevents the piston from moving axially inward under the action of the steps; A nut is screwed onto the multi-step structure of the piston rod until it fits against the piston, and is used to prevent the piston from moving outward axially; an anti-loosening component, acting between the nut and the piston rod, for preventing the nut from moving axially outward after circumferential rotation relative to the piston rod; The piston rod has a coaxial three-step structure at the connecting end that cooperates with the nut and the piston; the first-step structure of the piston rod is an optical axis that cooperates with the piston; the second-step structure of the piston rod is a threaded shaft that cooperates with the nut; the third-step structure of the piston rod is an optical axis with an outer circular groove that cooperates with the radial anti-loosening component.

2. The hydraulic cylinder with a piston anti-loosening structure according to claim 1, characterized in that: The anti-loosening component is inserted vertically inward from the radial outer peripheral surface of the nut until a portion of the anti-loosening component enters into the piston rod.

3. The hydraulic cylinder with a piston anti-loosening structure according to claim 2, characterized in that: A radial threaded hole is provided on the nut. When the nut is fitted with the piston, an outer circular groove coaxial with the radial threaded hole is provided on the piston rod. A part of the anti-loosening component is located in the outer circular groove, and the other part of the loosening component is fastened in the radial threaded hole.

4. The hydraulic cylinder with a piston anti-loosening structure according to claim 3, characterized in that: The anti-loosening component includes: a cylindrical pin, a portion of which falls into the outer circular groove and another portion of which is located in the radial threaded hole; The set screw is screwed into the radial threaded hole, pushing the cylindrical pin downward to tighten it in the outer circular groove, and the bottom surface protrusion of the set screw is inserted into the top surface groove of the cylindrical pin.

5. The hydraulic cylinder with a piston anti-loosening structure according to claim 4, characterized in that: A layer of anti-loosening glue is applied on the outer thread surface of the set screw, which is used to adhere the set screw and the nut together to prevent loosening.

6. The hydraulic cylinder with a piston anti-loosening structure according to claim 4, characterized in that: The set screw can be completely inserted into the radial threaded hole of the nut, and the top surface of the set screw is lower than the radial outer peripheral surface of the nut. Punching points are performed around the outer end of the radial threaded hole, so that the outer end of the radial threaded hole is deformed and contracted, thereby limiting the set screw in the radial threaded hole and preventing it from loosening.

7. The hydraulic cylinder with a piston anti-loosening structure according to claim 6, characterized in that: A plurality of punching points are uniformly spaced along the entire circumference around the outer end of the radial threaded hole.

8. The hydraulic cylinder with a piston anti-loosening structure according to claim 1, characterized in that: The connection between the nut and the piston rod is provided with a plurality of evenly spaced loosening parts along the entire circumference.

9. A motion assembly comprising a first component and a second component, characterized in that: A hydraulic cylinder with a piston anti-loosening structure according to any one of claims 1 to 8 is hinged between the first component and the second component.

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