Piston cylinder device and tractor

Abstract

The piston cylinder device comprises a piston cylinder body, a piston rod body and a piston anti-loosening assembly, the piston rod body is telescopically arranged on the piston cylinder body and sequentially provided with an anti-loosening installation section and a piston installation section from the inner end to the outside, and the end, away from the anti-loosening installation section, of the piston installation section forms an end-direction stop face. An outer thread is formed on the anti-loose installation section, a piston body in the piston anti-loose assembly is arranged on the piston installation section in a sleeving mode and abuts against the end-direction stop face, and an inner anti-loose nut, a stop gasket and an outer anti-loose nut are sequentially stacked and arranged on the anti-loose installation section in a sleeving mode so that the inner anti-loose nut can be tightened till the piston body can be tightly pressed on the end-direction stop face. And the outer locknut can be screwed until the locking gasket is pressed on the inner locknut, so that a hole matching structure does not need to be drilled while the anti-loosening effect is achieved, and the purposes of simplifying the structure, reducing the process complexity and ensuring the nut strength are achieved.

Description

Technical Field

[0001] This utility model belongs to the field of piston cylinder technology, and particularly relates to a piston cylinder device and a tractor. Background Technology

[0002] When agricultural tractors are tilling the land, they need to control the tilling depth by using a tractor lifting cylinder. However, the working conditions of the tractor lifting cylinder are quite demanding, and the frequent reciprocating motion of the cylinder piston can easily lead to loosening.

[0003] In existing technology, the hydraulic cylinder piston can be pressed onto the piston rod by a nut, and then a locking screw or locking pin can be inserted circumferentially from the nut to prevent the nut from loosening on the piston rod. However, in order to install the locking screw or locking pin, a matching hole structure needs to be drilled, which complicates the process and reduces the strength of the nut. Utility Model Content

[0004] In view of the above-mentioned defects or deficiencies, this utility model provides a piston cylinder device and a tractor, which aims to solve the technical problem that the existing piston anti-loosening structure requires drilling a fitting hole structure, resulting in complicated process.

[0005] To achieve the above objectives, the first aspect of this utility model provides a piston cylinder device, wherein the piston cylinder device includes a piston cylinder body, a piston rod body, and a piston anti-loosening assembly; the piston rod body is telescopically disposed on the piston cylinder body and has an anti-loosening mounting section and a piston mounting section sequentially arranged from the inner end to the outer end, the piston mounting section having an end-facing stop surface formed at the end away from the anti-loosening mounting section, and an external thread formed on the anti-loosening mounting section; the piston anti-loosening assembly includes a piston body, an inner anti-loosening nut, an outer anti-loosening nut, and a locking washer, the piston body being sleeved on the piston mounting section and abutting against the end-facing stop surface, the inner anti-loosening nut, the locking washer, and the outer anti-loosening nut being sequentially stacked and sleeved on the anti-loosening mounting section, such that the inner anti-loosening nut can be tightened to press the piston body against the end-facing stop surface, and the outer anti-loosening nut can be tightened to press the locking washer against the inner anti-loosening nut.

[0006] In one embodiment of this utility model, the locking washer is made of metal and includes a laminated part and a bending part. The laminated part is sleeved on the anti-loosening installation section and placed between the inner anti-loosening nut and the outer anti-loosening nut. The bending part extends from the laminated part out of the outer anti-loosening nut and is bent to fit against the outer periphery of the outer anti-loosening nut. The outer anti-loosening nut is a hexagonal nut.

[0007] In one embodiment of the present invention, the piston body has a first mounting hole through which the piston mounting section can pass, and a first stepped groove is formed along the periphery of the first mounting hole on the side of the piston body facing the inner end of the piston rod. The bottom wall of the first stepped groove abuts against the inner anti-loosening nut, and a first sealing component is provided between the hole wall of the first mounting hole and the piston mounting section.

[0008] In one embodiment of the present invention, the piston mounting section is provided with a first sealing groove for accommodating the first sealing assembly.

[0009] In one embodiment of this utility model, the depth of the first step groove is less than or equal to the height of the inner anti-loosening nut.

[0010] In one embodiment of the present invention, the piston body has a second mounting hole through which the piston mounting section can pass. A second stepped groove is formed on the side of the piston body away from the inner end of the piston rod body along the periphery of the second mounting hole. The bottom wall of the second stepped groove abuts against the end stop surface. The side wall of the second stepped groove is fitted onto the piston rod body. A second sealing assembly is provided between the side wall of the second stepped groove and the piston rod body.

[0011] In one embodiment of the present invention, the piston cylinder includes a cylinder body with a cylinder port and a guide cap covering the cylinder port. The guide cap is provided with a guide hole for the piston rod to extend into the cylinder body, and the wall of the guide hole is provided with a retaining ring assembly, a third sealing assembly and a support ring assembly for the piston rod to pass through in sequence along the direction in which the piston rod retracts into the cylinder body.

[0012] In one embodiment of the present invention, the support ring assembly includes a first support ring and a second support ring, which are respectively disposed on both sides of the third sealing assembly.

[0013] In one embodiment of this utility model, the end face of the guide cap facing outward is provided with a retaining ring mounting groove along the periphery of the guide hole. The retaining ring assembly includes a hole elastic retaining ring and a dustproof ring. The hole elastic retaining ring can press the dustproof ring against the bottom wall of the retaining ring mounting groove.

[0014] In one embodiment of the present invention, the third sealing assembly includes a U-shaped sealing ring and a step seal arranged at intervals.

[0015] In one embodiment of this utility model, the guide cap is provided with a dumbbell seal on the side that is in contact with the inner wall of the cylinder body.

[0016] In one embodiment of this utility model, a limiting block assembly is provided at the outer end of the piston rod, and a stop seat is provided on the piston cylinder, with a stop rod assembly that can abut against the limiting block assembly on the stop seat; wherein, the stop seat and the guide cap covering the cylinder opening of the piston cylinder are integrally arranged, or the stop seat and the guide cap covering the cylinder opening of the piston cylinder are separately arranged, and the separately arranged stop seat is located on the outer side wall of the piston cylinder.

[0017] In one embodiment of this utility model, the limiting block assembly includes a first clamping member and a second clamping member. The first clamping member and the second clamping member are assembled and clamped on the piston rod body and are detachably connected by a fastening connection assembly. The first clamping member has a limiting block body extending out from the side opposite to the second clamping member, which abuts against the stop rod assembly. The fastening connection assembly includes a fastening bolt, a fastening polygonal nut, and a washer. The threaded portion of the fastening bolt passes through the second clamping member and the first clamping member in sequence. The washer and the fastening polygonal nut are sequentially sleeved on the threaded portion extending from the first clamping member. The first clamping member also has a sleeve portion on the side opposite to the second clamping member, through which the threaded portion can pass.

[0018] To achieve the above objectives, a second aspect of this utility model provides a tractor, wherein the tractor lifting cylinder on the tractor is configured as a piston cylinder device according to the above description.

[0019] Through the above technical solution, the piston cylinder device provided by this utility model has the following beneficial effects:

[0020] When using the above-mentioned piston cylinder device, the piston body can be first fitted onto the piston mounting section, and then the inner anti-loosening nut, the locking washer, and the outer anti-loosening nut can be sequentially fitted onto the anti-loosening mounting section. Then, the inner anti-loosening nut can be tightened to press the piston body against the end stop surface. Finally, the outer anti-loosening nut can be tightened to press the locking washer onto the inner anti-loosening nut. This allows for frictional anti-loosening through the mutual locking of the two nuts, and the locking washer between the two nuts can further restrict the rotation of the nuts. While achieving the anti-loosening effect, there is no need to drill a fitting hole structure, which simplifies the structure, reduces the complexity of the process, and ensures the strength of the nuts.

[0021] Other features and advantages of this invention will be described in detail in the following detailed description section. Attached Figure Description

[0022] The accompanying drawings are provided to further illustrate the embodiments of the present invention and form part of the specification. They are used together with the following detailed description to explain the embodiments of the present invention, but do not constitute a limitation thereof. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without any inventive effort. In the drawings:

[0023] Figure 1 This is a cross-sectional structural schematic diagram of the piston cylinder device according to the first embodiment of the present utility model;

[0024] Figure 2 yes Figure 1 A structural diagram of one of the parts;

[0025] Figure 3 yes Figure 1 A structural diagram of another part;

[0026] Figure 4 This is a cross-sectional structural schematic diagram of the piston cylinder device according to the second embodiment of the present utility model;

[0027] Figure 5 This is a schematic diagram of the outer contour structure of the piston cylinder device according to the second embodiment of the present utility model;

[0028] Figure 6 This is a schematic diagram of the structure of a limiting block assembly according to an embodiment of the present invention.

[0029] Explanation of reference numerals in the attached figures:

[0030] 100 piston cylinder block, 110 cylinder body

[0031] 120 Guide Cap 121 Dumbbell Seal

[0032] 130 retaining ring assembly, 131 hole elastic retaining ring

[0033] 132 Dustproof Ring 140 Third Sealing Component

[0034] 141 U-shaped seal 142 Step seal

[0035] 150 Support Ring Assembly 151 First Support Ring

[0036] 152 Second support ring 160 Stop seat

[0037] 170 Stop lever assembly 200 Piston rod body

[0038] 210 Anti-loosening installation section 220 Piston installation section

[0039] 222 First sealing assembly

[0040] 230 Limiting block assembly 231 First clamping component

[0041] 232 Second clamping component 233 Limiting block body

[0042] 234 Sleeve section 240 Fastening connection assembly

[0043] 241 Fastening bolt 242 Fastening polygonal nut

[0044] 243 washer, 300 piston body

[0045] 310 First step groove 320 Second sealing assembly

[0046] 330 Glycerin ring, 340 piston support ring

[0047] 400 internal locknut, 500 external locknut

[0048] 600 retaining washer, 610 laminated part

[0049] 620 bending section Detailed Implementation

[0050] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of this utility model.

[0051] The piston cylinder device and tractor of this utility model are described below with reference to the accompanying drawings.

[0052] like Figure 1 and Figure 4 As shown, this utility model provides a piston cylinder device, wherein the piston cylinder device includes:

[0053] Piston cylinder 100;

[0054] The piston rod 200 is telescopically mounted on the piston cylinder 100 and has an anti-loosening mounting section 210 and a piston mounting section 220 arranged sequentially from the inner end to the outside. The piston mounting section 220 forms an end-facing stop surface at the end away from the anti-loosening mounting section 210, and an external thread is formed on the anti-loosening mounting section 210.

[0055] The piston anti-loosening assembly includes a piston body 300, an inner anti-loosening nut 400, an outer anti-loosening nut 500, and a locking washer 600. The piston body 300 is sleeved on the piston mounting section 220 and abuts against the end stop surface. The inner anti-loosening nut 400, the locking washer 600, and the outer anti-loosening nut 500 are stacked in sequence and sleeved on the anti-loosening mounting section 210, so that the inner anti-loosening nut 400 can be tightened to press the piston body 300 against the end stop surface, and the outer anti-loosening nut 500 can be tightened to press the locking washer 600 against the inner anti-loosening nut 400.

[0056] When using the above-mentioned piston cylinder device, the piston body 300 can be first fitted onto the piston mounting section 220, and then the inner anti-loosening nut 400, the locking washer 600, and the outer anti-loosening nut 500 can be sequentially fitted onto the anti-loosening mounting section 210. Then, the inner anti-loosening nut 400 is tightened to press the piston body 300 against the end stop surface. Finally, the outer anti-loosening nut 500 is tightened to press the locking washer 600 against the inner anti-loosening nut 400. This allows for frictional anti-loosening through the mutual locking of the two nuts, and further restricts nut rotation through the locking washer 600 between the two nuts. While achieving the anti-loosening effect, there is no need to drill a fitting hole structure, thus simplifying the structure, reducing process complexity, and ensuring nut strength.

[0057] It should be noted that the piston cylinder device provided by this utility model is particularly suitable for hydraulic piston cylinders, but if other types of piston cylinders use the piston cylinder device provided by this utility model, such as pneumatic cylinders, they should also fall within the protection scope of this utility model.

[0058] It should be noted that the end of the piston rod 200 that is placed inside the piston cylinder 100 is designated as the inner end of the piston rod 200, and the end of the piston rod 200 that is located outside the piston rod is designated as the outer end of the piston rod 200.

[0059] See Figure 1 , Figure 2 and Figure 4 In one embodiment of this utility model, the locking washer 600 is a metal part and includes a laminated portion 610 and a bending portion 620. The laminated portion 610 is sleeved on the anti-loosening mounting section 210 and positioned between the inner anti-loosening nut 400 and the outer anti-loosening nut 500. The bending portion 620 extends from the laminated portion 610 out of the outer anti-loosening nut 500 and is bent to fit against the outer periphery of the outer anti-loosening nut 500. The addition of the bending portion 620 to the locking washer 600 allows the locking washer 600 to grip the outer anti-loosening nut 500, further restricting its rotation. Simultaneously, the outer anti-loosening nut 500 is a hexagonal nut, making the grip of the bending portion 620 on the outer anti-loosening nut 500 more stable. Specifically, the inner anti-loosening nut 400 can be configured to have the same structure and dimensions as the outer anti-loosening nut 500.

[0060] See Figures 1 to 3 In the first embodiment of this utility model, the piston body 300 has a first mounting hole through which the piston mounting section 220 passes. A first stepped groove 310 is formed along the periphery of the first mounting hole on the side of the piston body 300 facing the inner end of the piston rod 200. The bottom wall of the first stepped groove 310 abuts against the inner anti-loosening nut 400, and a first sealing assembly 222 is provided between the hole wall of the first mounting hole and the piston mounting section 220. That is, by adding the first stepped groove 310, the inner anti-loosening nut 400 can be placed within the space formed by the first stepped groove 310, which helps to reduce the length of the piston cylinder 100. Furthermore, by adding the first sealing assembly 222, the sealing performance of the cavities on both sides of the piston body 300 can be enhanced. Specifically, in the first embodiment, the side of the piston body 300 facing away from the inner end of the piston rod 200 abuts against an end-facing stop surface. The first sealing assembly 222 includes a retaining ring and an O-ring. There are two retaining rings, and the O-ring is placed between the two retaining rings.

[0061] In the first embodiment of this utility model, the piston mounting section 220 is provided with a first sealing groove for accommodating the first sealing assembly 222. By placing the first sealing groove on the piston mounting section 220, and since the piston mounting section 220 already requires machining, machining the first sealing groove simultaneously with machining the piston mounting section 220 is simpler than placing the first sealing groove on the piston body 300, and also ensures the strength of the piston body 300.

[0062] In the first embodiment of this utility model, the depth of the first stepped groove 310 is less than or equal to the height of the inner anti-loosening nut 400. This allows the locking washer 600 to be located outside the first stepped groove 310, preventing the piston body 300 from interfering with the bending and forming of the bending portion 620. Specifically, the radial dimension of the first stepped groove 310 can be set to be greater than the radial dimension of the locking washer 600.

[0063] See Figure 4 and Figure 5 In the second embodiment of this utility model, the piston body 300 has a second mounting hole through which the piston mounting section 220 passes. A second stepped groove is formed along the periphery of the second mounting hole on the side of the piston body 300 opposite to the inner end of the piston rod 200. The bottom wall of the second stepped groove abuts against the end stop surface, and the side wall of the second stepped groove is fitted onto the piston rod 200. A second sealing assembly 320 is provided between the side wall of the second stepped groove and the piston rod 200. That is, by adding the second stepped groove, the piston body 300 abuts not only against the end stop surface but also against the portion of the piston rod 200 located outside the end stop surface, thus improving the stability of the piston body 300 mounted on the piston rod 200. Furthermore, the addition of the second sealing assembly 320 enhances the sealing performance of the cavities on both sides of the piston body 300. Specifically, the second sealing assembly 320 includes a retaining ring and an O-ring; two retaining rings are present, with the O-ring positioned between the two retaining rings.

[0064] Further, see Figure 1 , Figure 2 and Figure 4 In one embodiment of this utility model, a Gladley ring 330 and a piston support ring 340 may be provided at intervals on the outer periphery of the piston body 300. The Gladley ring 330 can play a sealing role, and the support ring, also known as a guide ring, has both a guiding role and can bear lateral loads.

[0065] See Figure 1 , Figure 3 and Figure 4In one embodiment of this utility model, the piston cylinder 100 includes a cylinder body 110 with a cylinder port and a guide cap 120 covering the cylinder port. The guide cap 120 is provided with a guide hole for the piston rod 200 to extend into the cylinder body 110. The wall of the guide hole is sequentially provided with a retaining ring assembly 130, a third sealing assembly 140, and a support ring assembly 150 for the piston rod 200 to pass through in the direction along which the piston rod 200 retracts into the cylinder body 110. The addition of the retaining ring assembly 130 provides dust prevention, the addition of the third sealing assembly 140 provides sealing, and the addition of the support ring assembly 150 provides resistance to lateral loads.

[0066] In one embodiment of this utility model, the support ring assembly 150 includes a first support ring 151 and a second support ring 152, which are respectively disposed on both sides of the third sealing assembly 140. By providing support rings on both sides of the third sealing assembly 140, the anti-side load performance can be further improved. Furthermore, the retaining ring assembly 130, the first support ring 151, the third sealing assembly 140, and the second support ring 152 are arranged sequentially at intervals.

[0067] In one embodiment of this utility model, the outward-facing end face of the guide cap 120 is provided with a retaining ring mounting groove along the periphery of the guide hole. The retaining ring assembly 130 includes a hole elastic retaining ring 131 and a dustproof ring 132. The hole elastic retaining ring 131 can press the dustproof ring 132 against the bottom wall of the retaining ring mounting groove. The dustproof ring 132 prevents contaminants from entering and scrapes away dirt from the piston rod 200, protecting the sealing element and guide element from wear and damage, thereby extending their service life. Furthermore, because the hole elastic retaining ring 131 can tightly fit the retaining ring mounting groove, it effectively prevents the dustproof ring 132 from sliding or loosening during equipment operation.

[0068] In one embodiment of this invention, the third sealing assembly 140 includes a U-shaped sealing ring 141 and a step seal 142 spaced apart. The U-shaped sealing ring 141 has a U-shaped cross-section, which allows it to fit tightly against the sealing surface when compressed, forming a good sealing effect. The step seal 142 is composed of a rubber O-ring and a polytetrafluoroethylene (PTFE) ring, wherein the O-ring acts as a force-applying element, providing sufficient sealing force and compensating for the PTFE ring. This design allows the step seal 142 to maintain a good sealing effect under both dynamic and static conditions.

[0069] In one embodiment of this utility model, the guide cap 120 is provided with a dumbbell seal 121 on the side that is in contact with the inner wall of the cylinder body 110. The dumbbell seal 121 has advantages such as torsion resistance, easy installation, high extrusion resistance and good wear resistance, and is particularly suitable for occasions that require high reliability and long service life seals.

[0070] Please see again Figure 1 and Figure 4 In one embodiment of this utility model, a limiting block assembly 230 is provided at the outer end of the piston rod 200, and a stop seat 160 is provided on the piston cylinder 100. A stop rod assembly 170, which can abut against the limiting block assembly 230, is provided on the stop seat 160. The stop seat 160 is integrally formed with a guide cap 120 covering the cylinder opening of the piston cylinder 100, or the stop seat 160 and the guide cap 120 are separately formed, with the separately formed stop seat 160 located on the outer side wall of the piston cylinder 100. This allows the stop seat 160 and the guide cap 120 to be either integrally formed or separately formed, depending on actual needs.

[0071] See Figure 1 , Figure 4 and Figure 6 In one embodiment of this utility model, the limiting block assembly 230 includes a first clamping member 231 and a second clamping member 232. The first clamping member 231 and the second clamping member 232 are assembled and clamped on the piston rod body 200 and are detachably connected by a fastening connection assembly 240. The first clamping member 231 extends out from the side opposite to the second clamping member 232 and has a limiting block body 233 that abuts against the stop rod assembly 170. The fastening connection assembly 240 includes a fastening bolt 241, a fastening polygonal nut 242 and a washer 243. The threaded portion of the fastening bolt 241 passes through the second clamping member 232 and the first clamping member 231 in sequence. The washer 243 and the fastening polygonal nut 242 are sequentially sleeved on the threaded portion extending from the first clamping member 231. Choosing to tighten the fastening bolt 241 with a polygonal nut 242 allows for the application of high torque with a torque wrench, providing reliable fastening, compared to using a non-circular nut such as a wing nut. Furthermore, positioning the washer 243 and the polygonal nut 242 on the same side as the limit block body 233 reduces the space occupied by the entire limit block assembly 230, thus improving spatial layout.

[0072] Specifically, the limiting block assembly 230 can be connected by two fastening connection assemblies 240, which are respectively located on both sides of the piston rod body. In addition, the first clamping member 231 is provided with a sleeve portion 234 on the side opposite to the second clamping member 232, through which the screw portion can pass. That is, fastening the polygonal nut 242 can press the washer 243 to the end of the sleeve portion 234 away from the first clamping member 231. The addition of the sleeve portion 234 can increase the connection length of the bolt to improve the connection strength.

[0073] Furthermore, this utility model also provides a tractor, wherein the tractor lifting cylinder on the tractor is configured as a piston cylinder device according to the above-described embodiments. Since the tractor adopts all the technical solutions of the above embodiments, it possesses at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated further here.

[0074] In the description of this utility model, it should be understood that 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 indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0075] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0076] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "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 the present invention. 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. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0077] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A piston cylinder arrangement, characterized in that The piston cylinder (100) comprises: A piston rod body (200) is telescopically arranged on the piston cylinder (100) and sequentially provided with an anti-loosening mounting section (210) and a piston mounting section (220) from the inner end to the outer end, and the piston mounting section (220) is formed with an end face stop surface at the end away from the anti-loosening mounting section (210), and the anti-loosening mounting section (210) is formed with an external thread. A piston anti-loosening assembly comprises a piston body (300), an inner anti-loosening nut (400), an outer anti-loosening nut (500) and a stop washer (600), the piston body (300) is sleeved on the piston mounting section (220) and abuts against the end face stop surface, the inner anti-loosening nut (400), the stop washer (600) and the outer anti-loosening nut (500) are sequentially stacked and sleeved on the anti-loosening mounting section (210), so that the inner anti-loosening nut (400) can be tightened to press the piston body (300) against the end face stop surface, and the outer anti-loosening nut (500) can be tightened to press the stop washer (600) against the inner anti-loosening nut (400). The stop washer (600) is made of metal and comprises a stacking portion (610) and a bending and pressing portion (620), the stacking portion (610) is sleeved on the anti-loosening mounting section (210) and arranged between the inner anti-loosening nut (400) and the outer anti-loosening nut (500), the bending and pressing portion (620) extends from the stacking portion (610) beyond the outer anti-loosening nut (500) and is bent and pressed to fit the outer periphery of the outer anti-loosening nut (500), and the outer anti-loosening nut (500) is a hexagonal nut.

2. Piston cylinder arrangement according to claim 1, characterized in that The piston body (300) has a first mounting hole through which the piston mounting section (220) passes, and a first stepped groove (310) is formed along the periphery of the first mounting hole on the side of the piston body (300) facing the inner end of the piston rod body (200), the groove bottom wall of the first stepped groove (310) abuts against the inner anti-loosening nut (400), and a first sealing assembly (222) is arranged between the hole wall of the first mounting hole and the piston mounting section (220).

3. Piston cylinder arrangement according to claim 1, characterized in that The piston mounting section (220) is provided with a first sealing groove for accommodating the first sealing assembly (222); and / or, the depth of the first stepped groove (310) is less than or equal to the height of the inner anti-loosening nut (400).

4. Piston cylinder arrangement according to claim 3, characterized in that The piston body (300) has a second mounting hole through which the piston mounting section (220) passes, and a second stepped groove is formed along the periphery of the second mounting hole on the side of the piston body (300) away from the inner end of the piston rod body (200), the groove bottom wall of the second stepped groove abuts against the end face stop surface, the groove side wall of the second stepped groove is sleeved on the piston rod body (200), and a second sealing assembly (320) is arranged between the groove side wall of the second stepped groove and the piston rod body (200).

5. Piston cylinder arrangement according to claim 1, characterized in that ​ 6. Piston cylinder arrangement according to any of claims 1 to 5, characterized in that The piston cylinder (100) comprises a cylinder body (110) with a cylinder port and a guide gland (120) arranged at the cylinder port, the guide gland (120) is provided with a guide hole for the piston rod (200) to extend into the cylinder body (110), and the hole wall of the guide hole is sequentially provided with a retainer ring assembly (130), a third sealing assembly (140) and a support ring assembly (150) for the piston rod (200) to pass through in the direction of retracting the piston rod (200) into the cylinder body (110).

7. A piston cylinder device according to claim 6, characterized in that The support ring assembly (150) comprises a first support ring (151) and a second support ring (152), and the first support ring (151) and the second support ring (152) are arranged on both sides of the third sealing assembly (140); And / or, the end face of the guide gland (120) arranged outward is provided with a retainer ring mounting groove along the periphery of the guide hole, the retainer ring assembly (130) comprises a hole elastic retainer ring (131) and a dust seal (132), the hole elastic retainer ring (131) can press the dust seal (132) against the groove bottom wall of the retainer ring mounting groove; And / or, the third sealing assembly (140) comprises a U-shaped sealing ring (141) and a stator seal (142) arranged at intervals; And / or, the side of the guide gland (120) for abutting with the inner wall of the cylinder body (110) is provided with a dumbbell seal (121).

8. Piston cylinder arrangement according to any of claims 1 to 5, characterized in that The outer end of the piston rod (200) is provided with a limiting block assembly (230), and the piston cylinder (100) is provided with a stop seat (160), and the stop seat (160) is provided with a stop rod assembly (170) which can abut against the limiting block assembly (230); Wherein, the stop seat (160) is integrally arranged with the guide gland (120) arranged at the cylinder port of the piston cylinder (100), or the stop seat (160) is separately arranged with the guide gland (120) arranged at the cylinder port of the piston cylinder (100), and the separately arranged stop seat (160) is arranged on the outer side wall of the piston cylinder (100).

9. A piston cylinder device according to claim 8, characterized in that The limiting block assembly (230) comprises a first clamping member (231) and a second clamping member (232), the first clamping member (231) and the second clamping member (232) are split clamped on the piston rod (200) and are detachably connected through a fastening connection assembly (240), and the side of the first clamping member (231) away from the second clamping member (232) is provided with a limiting block body (233) abutting against the stop rod assembly (170). The fastening connection assembly (240) comprises a fastening bolt (241), a fastening multi-angle nut (242) and a washer (243), a screw rod of the fastening bolt (241) passes through the second clamping piece (232) and the first clamping piece (231) in sequence, the washer (243) and the fastening multi-angle nut (242) are sleeved on the screw rod extending from the first clamping piece (231) in sequence, and the first clamping piece (231) is further provided with a sleeve portion (234) through which the screw rod passes on the side away from the second clamping piece (232).

10. A tractor characterised in that, The tractor lifting oil cylinder on the tractor is configured as the piston cylinder device according to any one of claims 1 to 9.

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