An adaptive press-fit device for track retaining rings
By designing guide blocks and positioning pins for the adaptive press-fitting device, the problem of press sleeve damage caused by inaccurate positioning of the retaining ring groove is solved, and precise alignment between the retaining ring and the pin groove is achieved, thereby improving the stability and service life of the track assembly.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANTUI CONSTR MASCH CO LTD
- Filing Date
- 2025-04-25
- Publication Date
- 2026-05-26
AI Technical Summary
In existing track assemblies, inaccurate positioning of the retaining ring groove leads to damage to the pressure sleeve, affecting the stable fixing of the pin shaft, making it difficult to adapt to complex working conditions, and reducing the performance and service life of the track assembly.
An adaptive press-fitting device is adopted. The guide block drives the positioning pin to move slightly. Combined with the elastic deformation of the positioning spring, the retaining ring and the pin retaining ring groove are precisely aligned. This ensures that the press sleeve is accurately pressed into the retaining ring groove and avoids damage to the press sleeve.
This achieves precise alignment between the retaining ring and the pin retaining ring groove, protecting the pressure sleeve, extending its service life, and improving the stability and overall performance of the track assembly.
Smart Images
Figure CN224273984U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of engineering machinery technology, specifically relating to an adaptive press-fitting device for track retaining rings. Background Technology
[0002] Track assemblies are key components of the mobility systems of construction machinery, widely used for their excellent motion stability. However, track assemblies typically bear high loads under harsh working conditions, making the pins prone to axial movement. While increasing the interference fit between the pin and the track link can alleviate this problem, excessive interference not only increases the difficulty of press-fitting but may also lead to safety hazards, such as track link deformation or pin breakage. Therefore, a more efficient and reliable solution is urgently needed that ensures stable pin fixation while adapting to complex working conditions and diverse requirements, thereby improving the overall performance and service life of the track assembly.
[0003] Existing methods typically use retaining rings to lock the pin within the track link. The retaining ring is an elastic element with a notch. The specific operation involves installing the retaining ring on the pressure sleeve of the pressing device, and applying pressure through the pressure sleeve to press the retaining ring into the retaining ring grooves at both ends of the pin, thereby ensuring that the pin does not move axially.
[0004] However, in actual use, due to the accumulation of tolerances in the center height and center distance of the track links, there are differences in the position of the retaining ring groove in the height and front-back direction of each link. This leads to inaccurate positioning during the press-fitting of the retaining ring, causing the retaining ring press sleeve to press onto the track link or pin, thereby cutting off a portion of the material. Over time, this can lead to damage to the press sleeve. Utility Model Content
[0005] This invention addresses the problem of damage to the press sleeve caused by inaccurate positioning of the retaining ring groove during the press-fitting process. It provides an adaptive press-fitting device for track retaining rings that can automatically position the retaining ring groove and prevent damage to the press sleeve.
[0006] To solve the above problems, the technical solution adopted by this utility model is an adaptive press-fitting device for track retaining rings, including a pressure plate and a pressure sleeve. The pressure sleeve is fixed to one side of the pressure plate. The pressure plate is provided with a guide groove, and a positioning groove 1 is provided on the inner side wall of the guide groove. The pressure sleeve is provided with a guide hole, and a positioning pin is provided through the guide hole. A positioning groove 2 is provided on the bottom outer circumference of the positioning pin, which is opposite to the positioning groove 1. A positioning spring is provided in the positioning groove 2, and the two ends of the positioning spring are respectively located inside the positioning groove 1 and the positioning groove 2. A guide block is provided on the top end face of the positioning pin, and the shape of the guide block is adapted to the axial inner hole of the pin to be mated. When the retaining ring is installed on the top of the positioning pin, the pressure plate drives the pressure sleeve to move closer to the pin. When the guide block is inserted into the axial inner hole of the pin, the guide block will cause the positioning pin to deflect slightly, and at the same time, the positioning spring will undergo elastic deformation, so that the position of the positioning pin is adjusted synchronously with the deflection of the guide block. This process ensures that the retaining ring is precisely aligned with the pin when the guide block is fully inserted into the axial inner hole of the pin, so that the pressure sleeve can accurately press the retaining ring into the retaining ring groove on the pin.
[0007] Furthermore, at least four positioning slots are provided, and these slots are evenly distributed circumferentially along the inner wall of the guide groove. The number and position of positioning slots two correspond to those of positioning slots one. This design ensures that when the guide block deviates in any direction, the positioning spring can adjust the position of the positioning pin accordingly, thereby achieving precise alignment.
[0008] Furthermore, the second positioning groove is elongated, and its length direction is aligned with the axial direction of the positioning pin. When the guide block is inserted into the axial inner hole of the pin, under the continuous pressure applied by the pressure plate, the top end face of the positioning pin will retract into the guide hole. This design allows the pressure sleeve to directly apply pressure to the retaining ring, thus smoothly pressing the retaining ring into the retaining ring groove.
[0009] Furthermore, an adjustment groove is provided on the bottom end face of the locating pin, and a return spring is installed in the adjustment groove. One end of the return spring abuts against the bottom of the adjustment groove, and the other end of the return spring abuts against the bottom of the guide groove. After one retaining ring is pressed in, the return spring can push the locating pin out to facilitate the installation of the next retaining ring.
[0010] Furthermore, a slot is provided on the top end face of the locating pin, which can fix the retaining ring to be installed. The slot can firmly hold the retaining ring, ensuring that the position between the retaining ring and the guide block remains relatively fixed before the pressure sleeve contacts the retaining ring.
[0011] Furthermore, the outer surface of the locating pin and the guide hole are fitted with a small clearance. This small clearance fit ensures that the locating pin will not deflect during offset, thus guaranteeing that the pressure sleeve can accurately press the retaining ring into the retaining ring groove of the pin.
[0012] Furthermore, a base is fixed to the other side of the pressure plate, and the base is connected to the machine tool cylinder. The machine tool cylinder drives the base to move, which in turn drives the pressure plate to move, providing power for pressing the retaining ring.
[0013] Furthermore, the guide block is configured as a frustum shape. The guide block is configured as a frustum shape to facilitate its smooth insertion into the axial inner hole of the pin.
[0014] As can be seen from the above technical solution, the advantages of this utility model are as follows: When the guide block is inserted into the axial inner hole of the pin, the guide block will cause the positioning pin to move slightly, and at the same time, the positioning spring will deform elastically, so that the position of the positioning pin will be adjusted synchronously with the deflection of the guide block, thereby ensuring that the retaining ring on the positioning pin is precisely aligned with the retaining ring groove on the pin. This allows the pressure sleeve to accurately press the retaining ring into the retaining ring groove on the pin. In summary, during the pressing process of the retaining ring, due to the guiding effect of the guide block, the retaining ring can automatically align with the retaining ring groove, avoiding the situation where the pressure sleeve presses on the track link or pin, effectively protecting the pressure sleeve and extending its service life. Attached Figure Description
[0015] To more clearly illustrate the technical solution of this utility model, the drawings used in the description 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 these drawings without creative effort.
[0016] Figure 1 This is a structural schematic diagram of a specific embodiment of the present utility model.
[0017] Figure 2 This is a schematic diagram of the positioning pin in a specific embodiment of this utility model.
[0018] In the diagram: 1. Base, 2. Pressure plate, 21. Guide groove, 22. Positioning groove one, 23. Positioning spring, 3. Pressure sleeve, 31. Guide hole, 4. Positioning pin, 41. Positioning groove two, 42. Guide block, 43. Slot, 44. Adjustment groove. Detailed Implementation
[0019] To make the objectives, features, and advantages of this utility model more apparent and understandable, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the specific embodiments. Obviously, the embodiments described below are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this patent, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this patent.
[0020] An adaptive press-fitting device for track retaining rings includes a base 1, a pressure plate 2, a pressure sleeve 3, and a positioning pin 4. The base 1 is bolted to a machine tool cylinder, which can move the base 1. The pressure plate 2 is mounted on the base 1, with one side fixedly connected to the base 1 by an internal hex bolt, and the other side fixedly connected to the pressure sleeve 3 by an internal hex bolt. Positioning pins 4 are provided inside the pressure plate 2 and the pressure sleeve 3, and the retaining ring to be press-fitted can be installed on the positioning pins 4. During the press-fitting process, the positioning pins 4 can adjust the position of the retaining ring, ensuring precise alignment between the retaining ring and the retaining ring groove on the pin shaft.
[0021] like Figure 1 As shown, in this specific embodiment, the pressure plate 2 adopts the following structure: a guide groove 21 is provided on the end face of the pressure plate 2 near the pressure sleeve 3, and the guide groove 21 is located at the center of the pressure plate 2. Positioning grooves 22 are provided on the inner wall of the guide groove 21, with at least four positioning grooves 22, and the positioning grooves 22 are evenly distributed circumferentially along the inner wall of the guide groove 21. In this embodiment, the guide groove 21 is circular, and there are six positioning grooves 22 in total. All positioning grooves 22 are evenly distributed circumferentially along the inner wall of the guide groove 21 and arranged at equal angles around the center line of the guide groove 21. A positioning spring 23 is installed inside each positioning groove 22, and one end of the positioning spring 23 is welded to the bottom of the positioning groove 22.
[0022] In this specific embodiment, the pressure sleeve 3 adopts the following structure: The pressure sleeve 3 is designed as a disc shape. As a key component for pressing the retaining ring, it is a vulnerable part and is therefore made of high-hardness H13 mold steel. The pressure sleeve 3 is provided with guide holes 31 penetrating its two end faces. The center line of the guide holes 31 coincides with the axis of the pressure sleeve 3, and the diameter of the guide holes 31 is smaller than the diameter of the guide groove 21.
[0023] In this specific embodiment, the positioning pin 4 adopts the following structure: the positioning pin 4 is configured as a stepped shaft, the bottom diameter of the positioning pin 4 is larger than its top diameter, and the top of the positioning pin 4 penetrates the entire guide hole 31. The bottom diameter of the positioning pin 4 is smaller than the diameter of the guide groove 21 and larger than the diameter of the guide hole 31, and the top diameter of the positioning pin 4 is smaller than the diameter of the guide hole 31, that is, the top of the positioning pin 4 and the guide hole 31 have a small clearance fit.
[0024] The bottom outer circumferential surface of the positioning pin 4 is provided with positioning groove 21, which is opposite to the position of positioning groove 22. The number and position of positioning groove 21 correspond to positioning groove 22. There are at least four positioning grooves 241, and they are evenly distributed along the circumference of the bottom outer circumferential surface of the positioning pin 4. In this embodiment, there are a total of six positioning grooves 241. All positioning grooves 241 are evenly distributed along the circumferential surface of the bottom outer circumferential surface of the positioning pin 4 and are arranged at equal angles around the axis of the positioning pin 4. The position of positioning groove 241 is one-to-one with the position of positioning groove 22.
[0025] The second positioning groove 41 is elongated, and its length direction is the same as that of the positioning pin 4. A sliding groove is provided at the bottom of the second positioning groove 41, and a slider is installed in the sliding groove. The slider can slide along the length direction of the second positioning groove 41, and the upper end of the slider is welded to the other end of the positioning spring 23.
[0026] like Figure 2 As shown, an adjustment groove 44 is provided on the bottom end face of the positioning pin 4. The adjustment groove 44 is designed to be circular, and the center line of the adjustment groove 44 coincides with the center line of the positioning pin 4. A return spring is provided inside the adjustment groove 44. One end of the return spring abuts against the bottom of the adjustment groove 44, and the other end of the return spring abuts against the bottom of the guide groove 21. In other embodiments, the two ends of the return spring can be welded to the bottom of the adjustment groove 44 and the bottom of the guide groove 21, respectively.
[0027] A guide block 42 is provided on the top end face of the positioning pin 4. The shape of the guide block 42 is adapted to the axial inner hole of the pin to be mated. In this embodiment, the guide block 42 is set as a frustum shape with a thicker bottom and a thinner top, and the axis of the guide block 42 coincides with the axis of the positioning pin 4. A groove 43 is provided on the top end face of the positioning pin 4, which can fix the retaining ring to be installed.
[0028] The specific usage process of this utility model is as follows: First, the retaining ring is hung on the slot 43 on the top end face of the positioning pin 4 by a robotic arm or manually. The retaining ring is a C-shaped elastic element with a notch; it can be hung on the slot 43 simply by appropriately expanding the retaining ring. Subsequently, the machine tool cylinder drives the entire device to move towards the position of the pin and the track link. The guide block 42 on the top end face of the positioning pin 4 begins to insert into the axial inner hole on the pin. As the guide block 42 is slowly inserted, it causes the positioning pin 4 to deflect slightly, and at the same time, the positioning spring 23 undergoes elastic deformation, so that the position of the positioning pin 4 is adjusted synchronously with the deflection of the guide block 42. When the guide block 42 is fully inserted into the axial inner hole of the pin, the retaining ring is precisely aligned with the retaining ring groove on the pin.
[0029] Next, as the pressure plate 2 continues to apply pressure, the locating pin 4 begins to compress the return spring, and the top end face of the locating pin 4 gradually retracts into the guide hole 31 of the pressure plate 2. At this time, the pressure plate 2 contacts the retaining ring and applies pressure, causing the retaining ring to fall off the slot 43 and be pressed into the retaining ring groove of the pin. The retaining ring retracts to its original size and is firmly locked in the retaining ring groove of the pin. Finally, the entire device is withdrawn, and the next retaining ring can be pressed in. During the withdrawal process, the locating pin 4 extends out of the guide hole 31 again under the action of the return spring. Because the bottom diameter of the locating pin 4 is larger than the diameter of the guide hole 31, the locating pin 4 will not completely disengage from the guide hole 31.
[0030] As can be seen from the above embodiments, the beneficial effects of this utility model are as follows: when the guide block is inserted into the axial inner hole of the pin, the guide block will cause the positioning pin to move slightly, and at the same time, the positioning spring will deform elastically, so that the position of the positioning pin will be adjusted synchronously with the deflection of the guide block, thereby ensuring that the retaining ring on the positioning pin is precisely aligned with the retaining ring groove on the pin. This allows the pressure sleeve to accurately press the retaining ring into the retaining ring groove on the pin. In summary, during the pressing process of the retaining ring, due to the guiding effect of the guide block, the retaining ring can automatically align with the retaining ring groove, avoiding the situation where the pressure sleeve presses on the track link or pin, effectively protecting the pressure sleeve and extending its service life.
[0031] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. An adaptive press-fitting device for track retaining rings, comprising a pressure plate (2) and a pressure sleeve (3), wherein the pressure sleeve (3) is fixed to one side of the pressure plate (2), characterized in that, The pressure plate (2) is provided with a guide groove (21), and a positioning groove (22) is provided on the inner side wall of the guide groove (21); the pressure sleeve (3) is provided with a guide hole (31), and a positioning pin (4) is provided in the guide hole (31) through the guide hole (31). A positioning groove (41) is provided on the bottom outer circular surface of the positioning pin (4) and is opposite to the positioning groove (22). A positioning spring (23) is provided in the positioning groove (41). The two ends of the positioning spring (23) are located inside the positioning groove (22) and the positioning groove (41) respectively. A guide block (42) is provided on the top end face of the positioning pin (4). The shape of the guide block (42) is adapted to the axial inner hole of the pin to be fitted.
2. The adaptive pressing device for track retaining rings according to claim 1, characterized in that, There are at least four positioning grooves (22), and the positioning grooves (22) are evenly distributed along the inner sidewall of the guide groove (21). The number and position of the positioning grooves (41) correspond to the positioning grooves (22).
3. The adaptive pressing device for track retaining rings according to claim 2, characterized in that, The second positioning groove (41) is set to be elongated, and the length direction of the second positioning groove (41) is the same as the axis direction of the positioning pin (4).
4. The adaptive pressing device for track retaining rings according to claim 3, characterized in that, An adjustment groove (44) is provided on the bottom end face of the positioning pin (4). A reset spring is provided in the adjustment groove (44). One end of the reset spring abuts against the bottom of the adjustment groove (44), and the other end of the reset spring abuts against the bottom of the guide groove (21).
5. The adaptive pressing device for track retaining rings according to claim 1, characterized in that, A slot (43) is provided on the top end face of the positioning pin (4), which can fix the retaining ring to be installed.
6. The adaptive press-fitting device for track retaining rings according to claim 1, characterized in that, The outer circular surface of the locating pin (4) and the guide hole (31) are fitted with a small clearance.
7. The adaptive pressing device for track retaining rings according to claim 1, characterized in that, A base (1) is fixed on the other side of the pressure plate (2), and the base (1) is connected to the machine tool cylinder.
8. The adaptive press-fitting device for track retaining rings according to claim 1, characterized in that, The guide block (42) is set to a frustum shape.