A hydraulic piston rod top end with dust ring end cover quick assembly sleeve tooling

Abstract

The utility model discloses a hydraulic piston rod top end area dustproof ring end cover quick assembly sleeve frock, including setting's piston rod, set up assembly slot in the piston rod, be provided with assembly component on the piston rod, assembly component includes the sleeve frock of installation on the piston rod, install the auxiliary assembly on the sleeve frock, the auxiliary assembly includes the auxiliary press -fitting sleeve pipe of installation on the sleeve frock, be provided with end cover under the auxiliary press -fitting sleeve pipe, the inside of end cover is seted up with the groove, be provided with dustproof ring in the groove. This hydraulic piston rod top end area dustproof ring end cover quick assembly sleeve frock, will dustproof ring beforehand into the groove of end cover, and the even force transmission of press machine makes dustproof ring along the external surface of the sizing sleeve joint section of sleeve frock smooth sliding, until assembling on the assembly slot on the piston rod, and the whole structure is simple, has reduced the cost and the difficulty of maintenance.

Description

Technical Field

[0001] This utility model relates to the field of mechanical assembly tool technology, specifically a quick-assembly sleeve tooling with a dustproof end cap on the top of a hydraulic piston rod. Background Technology

[0002] The dust seal end cap is a key protective component in the hydraulic cylinder. When it is installed manually, the lip of the dust seal is easily subjected to uneven external force, which can cause it to fold or deform, leading to sealing failure. In addition, manual operation makes it difficult to accurately control assembly tolerances, and the end cap is often not installed properly, requiring repeated adjustments, which is inefficient.

[0003] To overcome the above-mentioned defects, the prior art (Chinese patent with publication number CN110103006A, publication date August 9, 2019) provides a synchronous assembly fixture for a dust seal and a sliding bearing in a hydraulic cylinder head, including a positioning base, a support base, and a guide column. The lower boss at the bottom of the positioning base is positioned in the positioning hole of the hydraulic press. The support base is set in the lower groove at the top of the positioning base with clearance fit. The top of the support base is provided with an upper groove and an upper boss at the center. The outer periphery of the upper boss is provided with a mounting hole that passes through the bottom of the upper groove and the bottom of the support base. The mounting hole is provided with a compression spring whose top extends out of the mounting hole. The guide column includes a column body with an integral fixed structure and a limiting ring fitted outside the column body. The outer diameter of the limiting ring is larger than the outer diameter of the sliding bearing. This invention realizes the simultaneous press-fitting of the dust seal and the sliding bearing, eliminating the multiple assembly processes caused by two press-fitting operations and multiple tooling changes, improving assembly efficiency and reducing labor intensity.

[0004] Existing technologies achieve synchronous press-fitting of dust seals and sliding bearings through structural means. While this improves assembly efficiency to some extent, the overall structure is complex, costly, and lacks good reusability. During assembly, it is difficult to ensure that the components are on the same axis, which can easily cause assembly errors and unnecessary mechanical damage. This may lead to deformation or surface damage of parts, thus affecting the overall performance.

[0005] To address the aforementioned issues, there is an urgent need for innovative design based on the existing quick-assembly tooling with a dustproof end cap on the top of the hydraulic piston rod. Therefore, we proposed that the quick-assembly tooling with a dustproof end cap on the top of the hydraulic piston rod can effectively solve the above problems. Utility Model Content

[0006] The purpose of this utility model is to provide a quick-assembly sleeve tooling with a dustproof ring end cap on the top of a hydraulic piston rod, in order to solve the problems mentioned in the background art. Currently, the synchronous pressing of dustproof rings and sliding bearings through structure improves assembly efficiency to a certain extent, but its overall structure is complex, costly, and lacks good reusability. During the assembly process, it is difficult to ensure that the components are on the same axis, which can easily cause assembly errors and unnecessary mechanical damage, which may lead to deformation or surface damage of parts, thus affecting the overall performance.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a quick-assembly sleeve tooling with a dustproof ring end cap on the top of a hydraulic piston rod, comprising a piston rod with an assembly groove, an assembly assembly on the piston rod, the assembly assembly including a sleeve tooling mounted on the piston rod, an auxiliary assembly mounted on the sleeve tooling, the auxiliary assembly including an auxiliary press-fit sleeve mounted on the sleeve tooling, an end cap below the auxiliary press-fit sleeve, a groove inside the end cap, and a dustproof ring inside the groove.

[0008] Preferably, the sleeve fixture is a three-section integrated structure, the sleeve fixture is integrally machined from 45# steel, and the sleeve fixture includes an upper chamfered guide section, a middle transition section, and a lower sizing fitting section.

[0009] Preferably, the chamfered guide section is 30°. 0 ±0.5 0 The chamfered guide section has an outer diameter that is the diameter of the large end of the dustproof ring plus 1mm.

[0010] Preferably, the axial height of the transition section is 1.5 times the width of the dustproof ring, the inner diameter of the sizing fitting section is the piston rod diameter + 0.05mm, and the outer diameter of the sizing fitting section is the bottom diameter of the dustproof ring groove - 0.1mm.

[0011] Preferably, the auxiliary press-fit sleeve is a cylindrical sleeve, the inner diameter of the auxiliary press-fit sleeve is 1-2 mm larger than the outer diameter of the piston rod, a polyurethane buffer pad is embedded at the bottom of the auxiliary press-fit sleeve, the thickness of the polyurethane buffer pad is 5-8 mm, and an end cap is installed under the polyurethane buffer pad.

[0012] Preferably, the sizing fitting section and the piston rod are in a transition fit with a tolerance of H7 / g6.

[0013] Preferably, the top of the auxiliary press sleeve is provided with an M10 threaded hole, and the M10 threaded hole is used to connect to a hydraulic press.

[0014] Preferably, the auxiliary press-fit sleeve is subjected to a vertical downward pressure of 50~100N by a hydraulic press.

[0015] Compared with the prior art, the beneficial effects of this utility model are: the quick-assembly sleeve tooling with a dustproof ring end cap at the top of the hydraulic piston rod allows the dustproof ring to be pre-installed into the groove of the end cap. The press evenly transmits force, causing the dustproof ring to slide smoothly along the outer surface of the sizing and fitting section of the sleeve tooling until it is assembled into the mounting slot on the piston rod. The overall structure is simple, reducing maintenance costs and difficulties. The specific details are as follows: The sleeve fixture establishes a stable reference axis through the precise transition fit between the sizing fitting section and the piston rod assembly slot, reducing axis offset problems at the source. The chamfered guide section guides the dust seal lip to open smoothly, avoiding the twisting of the flange during the initial assembly stage. This solves the sealing failure problem caused by inaccurate positioning in traditional assembly and improves assembly accuracy.

[0016] Both the sleeve tooling and the auxiliary press-fit sleeve are made of 45# steel and machined in one piece. This material has excellent rigidity and wear resistance. The transition section of the tooling is smooth and without sharp edges, which not only avoids scratching the parts, but also makes the overall force uniform and less prone to deformation when subjected to assembly pressure, thus reducing tooling wear costs.

[0017] The smooth design of the transition section of the sleeve tooling prevents scratches on the dustproof ring lip. The polyurethane buffer pad at the bottom of the auxiliary press-fit sleeve utilizes elastic properties to avoid rigid contact causing pressure damage or scratches to the precision-machined surface of the end cap, thus reducing the loss of qualified parts.

[0018] The rigid auxiliary press sleeve ensures that the downward pressure of the press is transmitted vertically and evenly, avoiding assembly jamming caused by skewed force. The uniform force transmission makes the parts stable during the downward process, preventing deformation caused by excessive local force, and improving the stability and safety of the assembly operation.

[0019] The assembly process does not require repeated adjustments and calibrations. The end caps and dust rings can be assembled quickly and smoothly along the tooling, shortening the single-process operation time. The combination of high success rate and short operation time greatly improves overall production efficiency and achieves effective control of production costs. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the overall bottom view of the present invention; Figure 3 This is a schematic diagram of the cross-sectional structure of the auxiliary press-fit sleeve of this utility model; Figure 4 This is a schematic diagram of the cross-sectional structure of the piston rod of this utility model; Figure 5 This is a schematic diagram of the structure of the sleeve tooling of this utility model during installation; Figure 6 This is a schematic diagram of the structure of the sleeve tooling after installation.

[0021] In the diagram: 1. Piston rod; 2. Assembly slot; 3. Sleeve tooling; 4. Chamfered guide section; 5. Transition section; 6. Sizing fitting section; 7. Auxiliary press-fit sleeve; 8. Polyurethane buffer pad; 9. End cap; 10. Groove; 11. Dust ring. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Example: In this example, the press pusher end cover 9, with the dustproof ring 11, slides smoothly into the outer surface of the sizing fitting section 6 of the sleeve tooling 3 until it is assembled into the assembly slot 2 on the piston rod 1, improving the success rate and efficiency of assembly. Figures 1-6 The technical solution shown includes a piston rod 1 with an assembly slot 2 and an assembly assembly on the piston rod 1. The assembly assembly includes a sleeve fixture 3 mounted on the piston rod 1, an auxiliary assembly on the sleeve fixture 3, and an auxiliary pressing sleeve 7 mounted on the sleeve fixture 3. An end cap 9 is located below the auxiliary pressing sleeve 7, and a groove 10 is formed inside the end cap 9. A dustproof ring 11 is installed inside the groove 10. The sleeve fixture 3 is a three-section integrated structure, machined from 45# steel. The sleeve fixture 3 includes an upper chamfered guide section 4, a middle transition section 5, and a lower sizing fitting section 6. The chamfered guide section 4 is at a 30° angle. 0 ±0.5 0The chamfered guide section 4 has an outer diameter that is 1mm larger than the large end diameter of the dustproof ring 11. The axial height of the transition section 5 is 0.6 times the width of the dustproof ring 11. The inner diameter of the sizing fitting section 6 is 0.05mm larger than the piston rod 1 diameter, and the outer diameter is 0.1mm smaller than the bottom diameter of the groove 10 of the dustproof ring 11. The auxiliary press-fit sleeve 7 is a cylindrical sleeve with an inner diameter 1-2mm larger than the outer diameter of the piston rod 1. A polyurethane buffer pad 8 with a thickness of 5-8mm is embedded at the bottom of the auxiliary press-fit sleeve 7. An end cap 9 is installed under the polyurethane buffer pad 8. The sizing fitting section 6 and the piston rod 1 have a transition fit with a tolerance of H7 / g6. The top of the auxiliary press-fit sleeve 7 has an M10 threaded hole for connecting to a hydraulic press. The auxiliary press-fit sleeve 7 is pressurized by a hydraulic press. A vertical downward pressure of 50~100N is applied to pre-install the dust seal 11 into the groove 10 of the end cap 9. The sleeve fixture 3 is then fitted onto the assembly slot 2 at the top of the piston rod 1. The precise transition fit between the sizing section 6 at the bottom of the sleeve fixture 3 and the piston rod 1 establishes a stable and accurate reference axis for the entire assembly process, reducing assembly errors caused by axis misalignment. The sleeve fixture 3 is integrally machined from 45# steel to ensure overall strength and coaxial accuracy. 45# steel itself possesses excellent rigidity and wear resistance. The integral machining process avoids coaxiality deviations that may occur with spliced ​​structures, making the fixture less prone to deformation under assembly pressure, extending its service life while maintaining the stability of the assembly reference. The sleeve fixture 3 is divided into three sections from top to bottom. The uppermost chamfered guide section 4 is designed with a 30°... 0 ±0.5 0The chamfered edge is used to guide the dust ring 11 smoothly during the initial stage of assembly, effectively preventing its lip from turning over or twisting. This precise chamfer design ensures smooth guidance and avoids guidance failure caused by excessive or insufficient chamfer angle. The transition section 5 below the chamfered guide section 4 connects the guide section and the sizing section, ensuring structural continuity. The smooth design of the transition section 5 avoids steps or sharp edges on the tooling surface, preventing scratch damage to the lip of the dust ring 11 during assembly. It also makes the overall force of the tooling more even, improving structural stability. The inner diameter of the sizing fitting section 6 and the outer diameter of the assembly slot 2 of the piston rod 1 form an H7 / g6 transition fit to achieve precise positioning. Its outer diameter is used to standardize the pressing path of the end cap 9, providing a precise guide for the downward movement of the end cap 9. A precise guide track is used to prevent misalignment during the pressing of the end cap 9. The end cap 9, with the dust ring 11 already installed, is placed on the upper part of the sleeve fixture 3. The chamfered guide section 4 of the sleeve fixture 3 gently guides the lip of the dust ring 11 to gradually open, allowing it to smoothly enter the preset assembly track. This fundamentally avoids the flange or extrusion phenomenon caused by uneven force in the initial stage, improving the sealing reliability of the assembled product. Furthermore, the auxiliary pressing sleeve 7 is pressed onto the end cap 9, ensuring that the polyurethane buffer pad 8 at its bottom is in full contact with the surface of the end cap 9. The elasticity of the polyurethane buffer pad 8 effectively prevents damage to the finished surface of the end cap 9, avoiding scratches caused by rigid contact. This ensures the appearance quality and assembly accuracy of the parts. The rigid auxiliary pressing sleeve 7 ensures... The force applied by the press is transmitted vertically and evenly downwards, preventing assembly jamming or part damage caused by skewed forces. Even force transmission ensures stable force distribution on the end cap 9 and dust ring 11 during downward movement, avoiding part deformation caused by excessive localized force. The auxiliary press sleeve 7 is also made of 45# steel, with an inner diameter slightly larger than the outer diameter of the piston rod 1. The rigidity of 45# steel ensures the stability of pressure transmission. The reasonable design of the inner diameter avoids interference with the piston rod 1 and provides a reasonable assembly clearance for the press process. A polyurethane buffer pad 8 is embedded at the bottom of the auxiliary press sleeve 7 to protect the surface of the end cap 9 during press operation. The top can be connected to the press via threads to ensure that the applied downward pressure is vertical and even. The threaded connection allows for connection with the press... The secure fixing further ensures the verticality of the pressure direction, reducing the risk of pressure deviation. The hydraulic press is started, applying a vertical downward pressure of 50 to 100 N to the auxiliary press-fit sleeve 7. This pressure pushes the end cap 9, with the dust seal 11, smoothly slide into the outer surface of the sizing fitting section 6 of the sleeve tooling 3 until it is assembled onto the assembly slot 2 on the piston rod 1. This ensures assembly tolerances and greatly improves the success rate and efficiency of single assembly. The smooth sliding process avoids assembly impact, and combined with precise guidance and pressure control, significantly improves the success rate of single assembly, reduces rework time, and thus improves overall production efficiency. The sleeve tooling 3 and auxiliary press-fit sleeve 7 are removed. The reusable design of the tooling allows for recycling, reducing production auxiliary costs.Furthermore, the disassembly process is simple and convenient. Finally, the final assembly position of the end cap 9 and the sealing condition of the dust ring 11 are inspected, reducing rework costs and risks associated with subsequent quality issues. Content not described in detail in this manual is prior art known to those skilled in the art.

[0024] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A quick-assembly sleeve tooling for a hydraulic piston rod with a dustproof end cap, comprising a piston rod (1), characterized in that, The piston rod (1) is provided with an assembly slot (2), and an assembly assembly is provided on the piston rod (1). The assembly assembly includes a sleeve tool (3) installed on the piston rod (1). An auxiliary assembly is installed on the sleeve tool (3). The auxiliary assembly includes an auxiliary press-fit sleeve (7) installed on the sleeve tool (3). An end cap (9) is provided under the auxiliary press-fit sleeve (7). A groove (10) is provided inside the end cap (9). A dustproof ring (11) is provided inside the groove (10).

2. The quick-assembly fitting for a hydraulic piston rod with a dustproof end cap as described in claim 1, characterized in that: The sleeve tooling (3) is a three-section integrated structure. The sleeve tooling (3) is formed by integral turning of 45# steel. The sleeve tooling (3) includes an upper chamfered guide section (4), a middle transition section (5), and a lower sizing fitting section (6).

3. The quick-assembly fitting for a hydraulic piston rod with a dustproof end cap as described in claim 2, characterized in that: The chamfered guide section (4) is 30 degrees. 0 ±0.5 0 The outer diameter of the chamfered guide section (4) is the diameter of the large end of the dustproof ring (11) + 1mm.

4. The quick-assembly fitting for a hydraulic piston rod with a dustproof end cap as described in claim 2, characterized in that: The axial height of the transition section (5) is 0.6 times the width of the dustproof ring (11), the inner diameter of the sizing fitting section (6) is the diameter of the piston rod (1) + 0.05 mm, and the outer diameter of the sizing fitting section (6) is the bottom diameter of the groove (10) of the dustproof ring (11) - 0.1 mm.

5. The quick-assembly fitting for a hydraulic piston rod with a dustproof end cap as described in claim 1, characterized in that: The auxiliary press-fit sleeve (7) is a cylindrical sleeve. The inner diameter of the auxiliary press-fit sleeve (7) is 1-2 mm larger than the outer diameter of the piston rod (1). A polyurethane buffer pad (8) is embedded at the bottom of the auxiliary press-fit sleeve (7). The thickness of the polyurethane buffer pad (8) is 5-8 mm. An end cap (9) is installed under the polyurethane buffer pad (8).

6. The quick-assembly fitting for a hydraulic piston rod with a dustproof end cap as described in claim 2, characterized in that: The sizing fitting section (6) and the piston rod (1) are transition fits with a tolerance of H7 / g6.

7. The quick-assembly fitting for a hydraulic piston rod with a dustproof end cap as described in claim 1, characterized in that: The auxiliary press sleeve (7) is provided with an M10 threaded hole at the top, and the M10 threaded hole is used to connect to a hydraulic press.

8. The quick-assembly fitting for a hydraulic piston rod with a dustproof end cap as described in claim 1, characterized in that: The auxiliary press-fit sleeve (7) is subjected to a vertical downward pressure of 50~100N by a hydraulic press.

Images