Threaded joint for linear oil cylinder transmission

Abstract

The utility model discloses a threaded joint for linear oil cylinder transmission, which comprises a connecting cylinder and a locking end head, an internal thread matched with a thread of a piston rod is arranged in the connecting cylinder, the locking end head is fixed at the end part of the connecting cylinder, an occlusion seam is arranged on the locking end head, and the locking end head is fixed on the connecting cylinder. The longitudinal direction of the occlusion seam is arranged along the axial direction of the connecting cylinder, and the transverse direction of the occlusion seam penetrates into the connecting cylinder; the locking end comprises a locking hole, the locking hole intersects with the meshing seam, the locking hole penetrates through the two side walls of the meshing seam, and a set screw is fixed in the locking hole. After the threaded connector is in threaded connection with the piston rod of the linear oil cylinder, the set screw is fixed through the locking hole in the locking end, the locking end restrains compression of the connecting cylinder in the fixing process of the set screw, the width of an occlusion seam is reduced, and therefore threaded connection between the connecting cylinder and the piston rod is tighter.

Description

Technical Field

[0001] This utility model relates to the field of mechanical transmission technology, and in particular to a threaded joint for linear hydraulic cylinder transmission. Background Technology

[0002] A linear hydraulic cylinder, also known as a hydraulic cylinder, is an actuator that uses the pressure of hydraulic oil to drive a piston in linear reciprocating motion. It converts hydraulic energy into mechanical energy and is widely used in applications requiring high thrust, precise control, or heavy-duty linear motion, such as construction machinery, industrial equipment, and automation systems. The piston rod of a linear hydraulic cylinder is typically threaded and connected to the load via a threaded joint, ensuring reliable mechanical transmission during linear reciprocating motion. However, after the threaded joint is connected to the piston rod, gaps exist between the threads, which can easily lead to detachment during use.

[0003] In existing technologies, a cap with the opposite rotation direction to the threaded joint is usually set between the linear hydraulic cylinder and the threaded joint. The cap is tightened towards the threaded joint to compress it, thereby eliminating the gap between the threads and improving the connection stability of the threaded joint.

[0004] However, in factory practice, the hydraulic pressure inside the linear cylinder can cause the piston rod to rotate due to factors such as uneven load. Under long-term operation, the installation position of the splice cap is narrow, making it difficult to secure the splice cap very firmly. The splice cap is prone to loosening due to the rotation of the piston rod, which can eventually cause the threaded joint to loosen and cause equipment failure. Utility Model Content

[0005] The main objective of this invention is to provide a threaded joint for linear hydraulic cylinder transmission, thereby solving the technical problem in the prior art where the piston rod is prone to rotation, leading to the loosening of the threaded joint.

[0006] To achieve the above objectives, this utility model provides a threaded connector for linear hydraulic cylinder transmission, including a connecting cylinder and a locking end. The connecting cylinder has an internal thread that mates with the piston rod thread. The locking end is fixed to the end of the connecting cylinder and has an engagement slot. The engagement slot is longitudinally arranged along the axial direction of the connecting cylinder and transversely extends into the interior of the connecting cylinder. The locking end includes a locking hole that intersects with the engagement slot and extends through both sides of the engagement slot. A set screw is fixed inside the locking hole.

[0007] Furthermore, the interlocking seam extends longitudinally to the middle of the connecting cylinder.

[0008] Furthermore, the interlocking seams and locking holes are provided in multiple ways, and the multiple interlocking seams and locking holes are rotationally symmetrical about the axis of the connecting cylinder.

[0009] More preferably, the two symmetrically arranged set screws have opposite tightening directions.

[0010] Preferably, the outer diameter of the locking end is larger than the outer diameter of the connecting cylinder.

[0011] Preferably, both ends of the locking hole extend through the locking end.

[0012] More preferably, the set screw is connected to the locking hole by a thread.

[0013] More preferably, the locking hole is a countersunk hole, and the head of the set screw is located inside the countersunk hole.

[0014] More preferably, the opening of the countersunk hole extends to the bottom of the countersunk hole.

[0015] Furthermore, it also includes a connecting groove, which is annular and located in the middle of the connecting cylinder.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] In this invention, after the threaded connector is threadedly connected to the piston rod of the linear hydraulic cylinder, the set screw is fixed through the locking hole in the locking end. During the fixing process, the locking end of the set screw constrains the compression of the connecting cylinder, reducing the width of the engagement gap. This makes the threaded connection between the connecting cylinder and the piston rod tighter, increases the difficulty of relative displacement between the threaded connector and the piston rod, and reduces the possibility of the threaded connector coming off the piston rod. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0019] Figure 1 This is a front view schematic diagram of the overall structure of the threaded connector in one embodiment of the present utility model;

[0020] Figure 2 This is a side view schematic diagram showing a partial cross-section of a threaded joint in one embodiment of the present invention;

[0021] Figure 3 This is a top view of a partial cross-section of a threaded joint in one embodiment of the present invention.

[0022] The purpose, features, and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings.

[0023] Explanation of icon numbers:

[0024] 1. Locking end; 2. Locking hole; 3. Engagement seam; 4. Connecting cylinder; 5. Connecting groove. Detailed Implementation

[0025] It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0026] 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.

[0027] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0028] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0029] Please see Figures 1 to 3 This embodiment provides a threaded connector for linear hydraulic cylinder transmission, including a connecting cylinder 4 and a locking end 1. The connecting cylinder 4 has an internal thread that mates with the piston rod thread. The locking end 1 is fixed to the end of the connecting cylinder 4. The locking end 1 has an engagement slot 3, which is arranged longitudinally along the axial direction of the connecting cylinder 4 and laterally extends into the interior of the connecting cylinder 4. The locking end 1 includes a locking hole 2, which intersects with the engagement slot 3 and extends through both sides of the engagement slot 3. A set screw is fixed inside the locking hole 2.

[0030] The working principle of this embodiment is as follows: After the threaded connector is threadedly connected to the piston rod of the linear hydraulic cylinder, the other end of the threaded connector is connected to the load to ensure the connection stability in the power output of the linear hydraulic cylinder. The set screw is fixed through the locking hole 2 in the locking end 1. During the fixing process, the locking end 1 constrains the connecting cylinder 4 to compress inward, reducing the width of the engagement gap 3, thereby making the threaded connection between the connecting cylinder 4 and the piston rod tighter, increasing the difficulty of relative displacement between the threaded connector and the piston rod, and reducing the possibility of the threaded connector coming off the piston rod.

[0031] In this embodiment, as a further step, the longitudinal extension of the engagement seam 3 extends to the middle of the connecting cylinder 4. If the extension length of the engagement seam 3 is too short, the strength of the engagement seam 3 will be too great, making it difficult to compress the width of the engagement seam 3 inward, thus affecting the locking effect of the threaded joint; while if the length of the engagement seam 3 is too long, it will significantly reduce the strength of the threaded joint, ultimately hindering the output of the linear cylinder.

[0032] In one embodiment, multiple engagement seams 3 and locking holes 2 are provided, and the multiple engagement seams 3 and locking holes 2 are rotationally symmetrical about the axis of the connecting cylinder 4. In this embodiment, two engagement seams 3 and two locking holes 2 are provided, and they are symmetrically arranged with respect to the axis of rotation. The locking directions of the set screws inside the locking holes 2 are opposite. This arrangement not only balances the force on the piston rod during operation and reduces the possibility of piston rod rotation, but also prevents the centrifugal force of piston rod rotation from causing all set screws to loosen during long-term operation, further improving the stability of the threaded joint.

[0033] In this embodiment, preferably, the outer diameter of the locking end 1 is larger than the outer diameter of the connecting cylinder 4. Multiple locking holes 2 need to be provided in the locking end 1. Increasing the outer diameter of the locking end 1 can enhance its strength and prevent a decrease in strength due to the openings.

[0034] There are many ways to fix a set screw, including but not limited to setting a thread in the locking hole 2, where the set screw is connected to the locking hole 2 by the thread; or the two ends of the locking hole 2 pass through the locking end 1, and a nut is screwed into the other end of the locking hole 2 to fix the set screw.

[0035] In this embodiment, it is further preferred that the locking hole 2 is a countersunk hole, and the screw head of the set screw is located inside the countersunk hole. The countersunk hole allows the screw head of the set screw to be located inside the locking hole 2, preventing the screw head from protruding from the threaded joint and thus avoiding interference.

[0036] It is worth noting that the number of locking ends 1 is not limited to one. In scenarios where a more stable threaded connection is required, locking ends 1 can be simultaneously located at both ends of the connecting cylinder 4. Typically, the locking ends 1 are located on the connecting cylinder 4 at the end closest to the linear hydraulic cylinder. This allows the locking ends 1 to contact more threads, resulting in a better locking effect.

[0037] In one embodiment, the threaded connector further includes a connecting groove 5, which is annular and located in the middle of the connecting cylinder 4. The connecting groove 5 facilitates the engagement of the load and improves the stability of the connection with the load.

[0038] To facilitate implementation by those skilled in the art, this utility model also provides dimensions for some key positions of the threaded joint, for technical personnel to understand and manufacture. All units of measurement below are millimeters.

[0039] The threaded connector has a length of 55 and a height of 64. The length of the interlocking seam 3 is 35 and the width of the interlocking seam 3 is 1.5. The outer diameter of the connecting cylinder 4 is 48. The inner diameter of the connecting groove 5 is 39 and the width of the connecting groove 5 is 15. In this embodiment, both ends are also provided with chamfers with a chamfer size of 1*45°. The diameter of the locking hole 2 is 18. The distance from the locking hole 2 to the end of the locking end 1 is 12.5. The distance from the bottom of the countersunk hole to the interlocking seam 3 is 12. The diameter of the locking end 1 is 69. The threaded connector is made of HB220-250 tempered steel.

[0040] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A threaded joint for linear cylinder actuation, characterized in that, The connecting cylinder is internally provided with internal threads matched with the threads of the piston rod, and the locking end head is fixed to the end of the connecting cylinder, and the locking end head is provided with a bite seam, the longitudinal direction of the bite seam is along the axial direction of the connecting cylinder, and the transverse direction of the bite seam penetrates into the interior of the connecting cylinder; the locking end head comprises a locking hole intersecting with the bite seam, the locking hole penetrates the two side walls of the bite seam, and the locking hole is fixed with a locking screw.

2. Threaded joint according to claim 1, characterized in that The longitudinal direction of the bite seam extends to the middle part of the connecting cylinder.

3. A threaded joint as defined in claim 1, wherein The bite seam and the locking hole are provided in plurality, and the plurality of bite seams and locking holes are rotationally symmetrical along the axis of the connecting cylinder.

4. Threaded joint according to claim 3, characterized in that The locking directions of the two symmetrical locking screws are opposite.

5. A threaded joint as defined in claim 1, wherein The outer diameter of the locking end head is larger than the outer diameter of the connecting cylinder.

6. A threaded joint as defined in claim 1, wherein The two ends of the locking hole penetrate the locking end head.

7. Threaded joint according to claim 6, characterized in that The locking screw is connected with the locking hole through threads.

8. A threaded joint as defined in claim 6, wherein The locking hole is a countersunk hole, and the screw head of the locking screw is located in the countersunk hole.

9. Threaded joint according to claim 8, characterized in that The mouth of the countersunk hole extends to the bottom of the countersunk hole.

10. A threaded joint as defined in claim 1, wherein Further comprising a connecting groove, the connecting groove is annular, and the connecting groove is arranged in the middle part of the connecting cylinder.

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