Load-bearing buffer rotating shaft

Abstract

A bearing type buffering rotating shaft comprises a shell internally provided with a buffering cavity, a positioning seat, a damper, a buffering spring and a rotating shaft are arranged in the buffering cavity, and the two ends of the buffering spring are connected with the positioning seat and the shell respectively; a rotating block located between the positioning seat and the damper is arranged on the rotating shaft, and a bearing module used for bearing the gravity from the rotating shaft is arranged in the buffering cavity. According to the bearing module, the smoothness in the door opening and closing process can be improved. And under the action of the convex cambered surface and the concave cambered surface, the opening and closing smoothness of the door leaf can be further improved.

Description

Technical Field

[0001] This utility model relates to the field of door closer technology, specifically to a heavy-duty buffer shaft. Background Technology

[0002] A door closer is a device designed to assist in the opening and closing of doors and windows.

[0003] The applicant disclosed a pivot door closing device in the technical solution with announcement number CN218563376U. The pivot door closing device includes a shell with an internal buffer cavity. The buffer cavity is provided with a positioning seat, a damper, a buffer spring, and a rotating shaft. The two ends of the buffer spring are respectively connected to the positioning seat and the shell. The rotating shaft is provided with a rotating block located between the positioning seat and the damper. The rotating shaft is provided with a first bearing and a second bearing at the intersection with the shell, so as to realize the rotatable installation of the rotating shaft, thereby improving the smoothness of the rotating shaft when opening and closing the door.

[0004] However, this technical solution also has some shortcomings. For example, in actual use, radial bearings (such as deep groove ball bearings) are usually used as the first and second bearings. When the door leaf is connected to the load-bearing base of the rotating shaft, the rotating shaft will apply its own weight and the weight of the door leaf to the radial bearing at the same time. The radial bearing has a weak ability to bear axial loads. During long-term use, the contact surface between the balls and the raceway of the radial bearing is prone to elastic deformation or even plastic deformation, which leads to increased frictional resistance, decreased rotational accuracy, and even jamming, seriously affecting the smooth rotation of the rotating shaft. Utility Model Content

[0005] In order to overcome the shortcomings of the existing technology, this utility model provides a heavy-duty buffer shaft.

[0006] The technical solution adopted by this utility model to solve its technical problem is:

[0007] A heavy-duty buffer shaft includes a housing with an internal buffer cavity. The buffer cavity contains a positioning seat, a damper, a buffer spring, and a rotating shaft. The two ends of the buffer spring are connected to the positioning seat and the housing, respectively. A rotating block is located on the rotating shaft between the positioning seat and the damper. The buffer cavity contains a load-bearing module for bearing the weight of the rotating shaft. The load-bearing module includes a load-bearing base, a load-bearing rotating seat, and multiple load-bearing balls. The load-bearing base is positioned within the buffer cavity and has a first annular groove and a load-bearing annular groove. The load-bearing rotating seat is fitted onto the rotating shaft and is at least partially rotatably mounted in the load-bearing annular groove. The load-bearing rotating seat has a support ring for supporting the rotating shaft. A second annular groove is provided between one side of the support ring and the outer circumferential surface of the load-bearing rotating seat. The multiple load-bearing balls are distributed around the rotating shaft, with their two ends rolling in the first and second annular grooves, respectively.

[0008] In this embodiment, the damper is provided with a mounting clearance flat for reducing the volume of the damper.

[0009] In this embodiment, the damper is used to cooperate with a concave arc surface on one end of the rotating block.

[0010] In this embodiment, the rotating block includes a cam surface, the positioning seat is provided with a positioning protrusion, the positioning protrusion is provided with a positioning plane that slides on the cam surface, the damper is provided with a damping engagement part, the damping engagement part is provided with a sliding protrusion that slides on the cam surface, and both sides of the damping engagement part form an installation clearance flat position with one end face of the damper used to engage the rotating block.

[0011] In this embodiment, the cam surface includes a sliding surface, a first plane, two convex arc surfaces, and two second planes. The two ends of the sliding surface are respectively connected to one end of the two convex arc surfaces, and the other end of each convex arc surface is connected to one end of a second plane. The two ends of the first plane are respectively perpendicularly connected to the other ends of the two second planes.

[0012] In this embodiment, the sliding protrusion includes a stop surface and two concave arc surfaces that are respectively connected to both ends of the stop surface. The two concave arc surfaces are symmetrically arranged with the stop surface as the center.

[0013] In this embodiment, the load-bearing base includes a load-bearing bottom ring and a load-bearing retaining ring integrally formed and connected with the load-bearing bottom ring. The load-bearing retaining ring is located on the end of the load-bearing bottom ring facing the load-bearing rotating seat. The inner ring of the load-bearing retaining ring and the inner ring of the load-bearing bottom ring form the load-bearing ring groove. The first ring groove is located between the end face of the load-bearing bottom ring and the inner ring wall of the load-bearing retaining ring.

[0014] In this embodiment, the wall of the buffer cavity is provided with a load-bearing positioning groove, and the load-bearing base is at least partially positioned and embedded in the load-bearing positioning groove.

[0015] In this embodiment, the outer shell is provided with a rotation clearance hole corresponding to the rotation axis. One end of the rotation axis is provided with a connecting shaft portion that extends out of the outer shell from the rotation clearance hole. The connecting shaft portion is connected to a rotating seat for fixing on the door.

[0016] In this embodiment, the end of the connecting shaft away from the rotating shaft is provided with a connecting screw hole, the rotating seat is provided with a connecting through hole, a connecting bolt threaded into the connecting screw hole is inserted into the connecting through hole, and the rotating seat is provided with a tapered insertion groove corresponding to and communicating with the connecting through hole; the end of the connecting shaft away from the rotating shaft is a tapered insertion head, and the tapered insertion head is non-rotatably fitted in the tapered insertion groove.

[0017] The beneficial effects of this utility model are as follows: The load-bearing module of this utility model includes a load-bearing base, a load-bearing rotating seat, and multiple load-bearing balls. The load-bearing rotating seat is rotatably installed in a first annular groove, forming a nested structure with the load-bearing base. A second annular groove is located between one side of the support ring and the outer circumferential surface of the load-bearing rotating seat. The first and second annular grooves provide bidirectional constraint on the load-bearing balls. When the gravity output surface of the rotating shaft directly acts on the support ring of the load-bearing rotating seat, the axial force is transmitted to the load-bearing balls through the second annular groove and then dispersed to the load-bearing base by the first annular groove, allowing the load-bearing module to stably support the rotating shaft axially. Furthermore, this design allows radial force to be transmitted to the load-bearing base via the outer circumferential surface of the load-bearing rotating seat and then through the load-bearing balls, effectively resisting eccentric loads during door opening and closing, and improving the smoothness of the door opening and closing process. Moreover, the combined effect of the convex and concave arc surfaces further enhances the smoothness of door opening and closing. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0019] Figure 1 A 3D view of a load-bearing buffer shaft;

[0020] Figure 2 A schematic diagram of the combination of positioning seat, damper, buffer spring and rotating shaft;

[0021] Figure 3 For the explosion of the positioning seat, damper, buffer spring and rotating shaft Figure 1 ;

[0022] Figure 4 For the explosion of the positioning seat, damper, buffer spring and rotating shaft Figure 2 ;

[0023] Figure 5 Internal structure of the load-bearing buffer shaft Figure 1 ;

[0024] Figure 6 Internal structure of the load-bearing buffer shaft Figure 2 ;

[0025] Figure 7 A schematic diagram showing the change of the load-bearing buffer hinge from the open state to the closed state. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0027] It should be noted that if any directional indication (such as up, down, left, right, front, back, top, bottom, inside, outside, vertical, horizontal, longitudinal, counterclockwise, clockwise, circumferential, radial, axial, etc.) is involved in the embodiments of this utility model, the directional indication is 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 indication will also change accordingly.

[0028] Furthermore, unless otherwise explicitly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection using welding, a detachable connection using bolts, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0029] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," such descriptions are 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, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. 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.

[0030] Reference Figure 1-7A load-bearing buffer shaft includes a housing 1 with an internal buffer cavity. The buffer cavity contains a positioning seat 2, a damper 3, a buffer spring 4, and a rotating shaft 5. The two ends of the buffer spring 4 are respectively connected to the positioning seat 2 and the housing 1. The rotating shaft 5 is provided with a rotating block 51 located between the positioning seat 2 and the damper 3.

[0031] Furthermore, the buffer cavity is provided with a load-bearing module 6 for bearing the gravity from the rotating shaft 5. The load-bearing module 6 includes a load-bearing base 61, a load-bearing rotating seat 62, and a plurality of load-bearing balls 63. The load-bearing base 61 is positioned and installed in the buffer cavity. The load-bearing base 61 is provided with a first annular groove 611 and a load-bearing annular groove 612. The load-bearing rotating seat 62 is fitted onto the rotating shaft 5 and is at least partially rotatably installed in the load-bearing annular groove 612. The load-bearing rotating seat 62 is provided with a support ring 621 that supports the rotating shaft 5. The rotating shaft 5 is provided with a gravity output surface that presses against the support ring 621. The gravity output surface is on the side of the rotating block 51 facing the load-bearing module 6. A second annular groove 622 is provided between one side of the support ring 621 and the outer peripheral surface of the load-bearing rotating seat 62. The plurality of load-bearing balls 63 are distributed around the rotating shaft 5 and their two ends roll in the first annular groove 611 and the second annular groove 622, respectively.

[0032] The load-bearing module 6 in this embodiment includes a load-bearing base 61, a load-bearing rotating seat 62, and multiple load-bearing balls 63. The load-bearing rotating seat 62 is rotatably mounted in a first annular groove 611, forming a nested structure with the load-bearing base 61 and the load-bearing rotating seat 62. A second annular groove 622 is then positioned between one side of the support ring 621 and the outer circumferential surface of the load-bearing rotating seat 62. The bidirectional constraint of the load-bearing balls 63 by the first annular groove 611 and the second annular groove 622 on the rotating shaft... When the gravity output surface of 5 directly acts on the support ring 621 of the load-bearing rotating seat 62, the axial force is transmitted to the load-bearing ball 63 through the second ring groove 622, and then distributed to the load-bearing base 61 by the first ring groove 611, so that the load-bearing module 6 can stably support the rotating shaft 5 axially; moreover, this design structure can allow the radial force to be transmitted to the load-bearing base 61 through the outer circumference of the load-bearing rotating seat 62 and then through the load-bearing ball 63, effectively resisting the eccentric load during the opening and closing of the door and improving the smoothness of the opening and closing process.

[0033] In this embodiment, a load-bearing positioning groove 112 is provided on the wall of the buffer cavity, and the load-bearing base 61 is at least partially positioned and embedded in the load-bearing positioning groove 112, thereby realizing the positioning and installation of the load-bearing base 61. Furthermore, the load-bearing base 61 includes a load-bearing bottom ring 613 at least partially embedded in the load-bearing positioning groove 112 and a load-bearing retaining ring 614 integrally formed and connected to the load-bearing bottom ring 613. The load-bearing retaining ring 614 is located on the end of the load-bearing bottom ring 613 facing the load-bearing rotating seat 62. The inner ring of the load-bearing retaining ring 614 and the inner ring of the load-bearing bottom ring 613 form the load-bearing ring groove 612. The first ring groove 611 is located between the end face of the load-bearing bottom ring 613 and the inner ring wall of the load-bearing retaining ring 614. This structural design further enhances the constraint of the load-bearing base 61 on the load-bearing ball 63, so that the load-bearing ball 63 provides reverse constraint on the load-bearing rotating seat 62, thereby enabling the load-bearing rotating seat 62 to better support the rotating shaft 5 and resist the eccentric load during the rotation of the rotating shaft 5.

[0034] In this embodiment, the rotating block 51 is integrally formed with the rotating shaft 5. The rotating block 51 includes a cam surface, which includes a sliding surface 511, a first plane 512, two symmetrically arranged convex arc surfaces 513, and two symmetrically arranged second planes 514. The two ends of the sliding surface 511 are respectively connected to one end of the two convex arc surfaces 513, and the other end of each convex arc surface 513 is connected to one end of a second plane 514. The first plane 512 and the second planes 514 are arranged perpendicularly to each other, and the two ends of the first plane 512 are respectively perpendicularly connected to the other ends of the two second planes 514.

[0035] Furthermore, the positioning seat 2 is provided with a positioning protrusion 21, and the positioning protrusion 21 is provided with a positioning plane 22 that slides on the cam surface; the damper 3 is provided with a damping engagement part 31 at one end for engaging with the rotating block 51, and a sliding protrusion 32 that slides on the cam surface at the end of the damping engagement part 31 away from the damper 3. The concave arc surface 322 is formed by the sliding protrusion 32. Specifically, the sliding protrusion 32 includes a stop surface 321 and two concave arc surfaces 322 that are respectively connected to the two ends of the stop surface 321. The two concave arc surfaces 322 are symmetrically arranged with the stop surface 321 as the center. Due to the concave arc design of the concave arc surface 322, the concave arc surface 322 can avoid the sliding surface 511, so that the concave arc surface 322 basically does not contact the sliding surface 511 during the rotation of the rotating block 51, thereby reducing friction and improving the smoothness of the door opening and closing.

[0036] During the opening of the door, the stop surface 321 slides along the convex arc surface 513 until it abuts against one of the second planes 514, and the positioning plane 22 of the positioning protrusion 21 abuts against the other second plane 514, keeping the door open at 90°. At this time, the buffer spring 4 is compressed. When the door is closed, the door drives the rotating block 51 to rotate more than 20° in the closing direction, causing the stop surface 321 to leave the second plane 514 and slide back onto the convex arc surface 513. The positioning plane 22 of the positioning protrusion 21 leaves the other second plane 514. At this time, the buffer spring 4 unfolds and pushes the rotating block 51 back to its original position until the sliding surface 511 abuts against the stop surface 321, and the positioning plane 22 of the positioning protrusion 21 abuts against the first plane 512, so that the door remains closed under normal conditions without displacement.

[0037] In this embodiment, the damping mating part 31 is located at the middle of one end of the damper 3 that is used to mate with the rotating block 51. Both sides of the damping mating part 31 form mounting clearance flats 33 with the end face of the damper 3 that is used to mate with the rotating block 51. The mounting clearance flats 33 are used to reduce the volume of the damper 3, thereby reducing the space occupied inside the buffer cavity, and also facilitating the damping mating part 31 to extend between the radial bearing 7 and the load-bearing module 6 to mate with the rotating block 51 for buffering.

[0038] In this embodiment, the outer shell 1 includes a shell 11, a first end cap 12 and a second end cap 13. The rotation clearance hole 111 is provided on one side of the shell 11. The buffer cavity is provided inside the shell 11. The two ends of the buffer cavity pass through the two ends of the shell 11 respectively. The first end cap 12 and the second end cap 13 are respectively provided on the two ends of the shell 11 and respectively close the two ends of the buffer cavity. The first end cap 12 and the second end cap 13 are both fixed to the shell 11 by end cap bolts 14.

[0039] In this embodiment, the two ends of the buffer spring 4 abut against the first end cover 12 and the second end cover 13, respectively. The first end cover 12 has a spring groove on the end facing the buffer cavity, and the positioning seat 2 has a spring insertion part on the end facing the buffer spring 4. The buffer spring 4 is a compression spring. One end of the buffer spring 4 is inserted into the spring groove, and the spring insertion part is inserted into the inner ring of the other end of the buffer spring 4, so that the buffer spring 4, the first end cover 12, and the positioning seat 2 are mutually positioned to ensure the quality of their fit.

[0040] In this embodiment, the second end cap 13 is provided with a buffer pad 8 at one end facing the buffer cavity, and the other end of the damper 3 abuts against the buffer pad 8.

[0041] In this embodiment, the outer shell 1 is provided with a rotation clearance hole 111 corresponding to the rotation shaft 5. One end of the rotation shaft 5 is provided with a connecting shaft portion 52 extending out of the outer shell 1 from the rotation clearance hole 111. The connecting shaft portion 52 is connected to a rotating seat 9 for fixing to a door. Furthermore, the end of the connecting shaft portion 52 away from the rotation shaft 5 is provided with a connecting screw hole, and the rotating seat 9 is provided with a connecting through hole. A connecting bolt 10 threaded into the connecting screw hole is inserted into the connecting through hole, thereby using the connecting bolt 10 to combine and fix the rotating seat 9 and the connecting shaft portion 52 together.

[0042] In this embodiment, the rotating base 9 is provided with a tapered insertion groove 91 that communicates with the connecting through hole. The tapered insertion groove 91 and the connecting through hole are located at opposite ends of the rotating base 9. The cross-sectional area of ​​the tapered insertion groove 91 gradually decreases along the direction close to the connecting through hole. The end of the connecting shaft portion 52 away from the rotating shaft 5 is a tapered insertion head 53 for insertion into the tapered insertion groove 91. The cross-sectional area of ​​the tapered insertion groove 91 gradually decreases along the direction close to the connecting screw hole. The shape of the tapered insertion groove 91 is the same as the shape of the tapered insertion head 53. The tapered insertion head 53 is non-rotatably fitted into the tapered insertion groove 91. During installation, tightening the connecting bolt 10 will cause the connecting bolt 10 to drive the tapered insertion head 53 into the tapered insertion groove 91 until the tapered insertion head 53 can no longer be inserted, at which point the tapered insertion head 53 is completely fixed in the tapered insertion groove 91 and cannot be moved. The design of the tapered insertion slot 91 and tapered insertion head 53 makes the connection between the connecting shaft 52 and the rotating seat 9 tighter and free of play. This not only ensures the installation stability between them, but also makes it less likely that the connection between the connecting shaft 52 and the rotating seat 9 will cause collisions and abnormal noises due to play during the opening and closing of the door.

[0043] In this embodiment, the rotating shaft 5 is also fitted with a radial bearing 7, preferably a deep groove ball bearing. The rotating block 51 is located between the radial bearing 7 and the load-bearing module 6, thereby using the radial bearing 7 and the load-bearing module 6 to rotatably install the rotating shaft 5 in the buffer cavity, improving the smoothness of the rotating shaft 5.

[0044] The above description is only a preferred embodiment of the present utility model. Any technical solution that achieves the purpose of the present utility model by essentially the same means shall fall within the protection scope of the present utility model.

Claims

1. A load-bearing buffer shaft, comprising a housing (1) with an internal buffer cavity, wherein a positioning seat (2), a damper (3), a buffer spring (4), and a rotating shaft (5) are provided within the buffer cavity, and the two ends of the buffer spring (4) are respectively connected to the positioning seat (2) and the housing (1); a rotating block (51) is provided on the rotating shaft (5) between the positioning seat (2) and the damper (3), characterized in that, The buffer cavity is provided with a load-bearing module (6) for bearing the weight from the rotating shaft (5). The load-bearing module (6) includes a load-bearing base (61), a load-bearing rotating seat (62), and a plurality of load-bearing balls (63). The load-bearing base (61) is positioned and installed in the buffer cavity. The load-bearing base (61) is provided with a first annular groove (611) and a load-bearing annular groove (612). The load-bearing rotating seat (62) is fitted on the rotating shaft (5) and at least part of it is rotatably installed in the load-bearing annular groove (612). The load-bearing rotating seat (62) is provided with a support ring (621) for supporting the rotating shaft (5). A second annular groove (622) is provided between one side of the support ring (621) and the outer peripheral surface of the load-bearing rotating seat (62). The plurality of load-bearing balls (63) are distributed around the rotating shaft (5) and their two ends roll in the first annular groove (611) and the second annular groove (622) respectively.

2. The load-bearing buffer shaft according to claim 1, characterized in that: The damper (3) is provided with an installation clearance flat (33) for reducing the volume of the damper (3).

3. The load-bearing buffer shaft according to claim 1, characterized in that: The damper (3) is used to cooperate with the rotating block (51) which has a concave arc surface (322) on one end.

4. A heavy-duty buffer shaft according to claim 1, characterized in that: The rotating block (51) includes a cam surface. The positioning seat (2) is provided with a positioning protrusion (21). The positioning protrusion (21) is provided with a positioning plane (22) that slides on the cam surface. The damper (3) is provided with a damping engagement part (31). The damping engagement part (31) is provided with a sliding protrusion (32) that slides on the cam surface. Both sides of the damping engagement part (31) form an installation clearance flat position (33) with one end face of the damper (3) used to engage the rotating block (51).

5. A heavy-duty buffer shaft according to claim 4, characterized in that: The cam surface includes a sliding surface (511), a first plane (512), two convex arc surfaces (513), and two second planes (514). The two ends of the sliding surface (511) are respectively connected to one end of the two convex arc surfaces (513), and the other end of each convex arc surface (513) is connected to one end of a second plane (514). The two ends of the first plane (512) are respectively perpendicularly connected to the other ends of the two second planes (514).

6. A heavy-duty buffer shaft according to claim 5, characterized in that: The sliding protrusion (32) includes a stop surface (321) and two concave arc surfaces (322) that are respectively connected to the two ends of the stop surface (321). The two concave arc surfaces (322) are symmetrically arranged with the stop surface (321) as the center.

7. A heavy-duty buffer shaft according to any one of claims 1-6, characterized in that: The load-bearing base (61) includes a load-bearing bottom ring (613) and a load-bearing retaining ring (614) integrally formed and connected with the load-bearing bottom ring (613). The load-bearing retaining ring (614) is located on one end of the load-bearing bottom ring (613) facing the load-bearing rotating seat (62). The inner ring of the load-bearing retaining ring (614) and the inner ring of the load-bearing bottom ring (613) form the load-bearing ring groove (612). The first ring groove (611) is located between the end face of the load-bearing bottom ring (613) and the inner ring wall of the load-bearing retaining ring (614).

8. A heavy-duty buffer shaft according to claim 7, characterized in that: The wall of the buffer cavity is provided with a load-bearing positioning groove (112), and the load-bearing base (61) is at least partially positioned and embedded in the load-bearing positioning groove (112).

9. A heavy-duty buffer shaft according to any one of claims 1-6, characterized in that: The outer shell (1) is provided with a rotation clearance hole (111) corresponding to the rotation shaft (5). One end of the rotation shaft (5) is provided with a connecting shaft part (52) extending out of the outer shell (1) from the rotation clearance hole (111). The connecting shaft part (52) is connected to a rotating seat (9) for fixing on the door.

10. A load-bearing buffer shaft according to claim 9, characterized in that: The connecting shaft (52) has a connecting screw hole at the end away from the rotating shaft (5), and the rotating seat (9) has a connecting through hole. A connecting bolt (10) threaded in the connecting screw hole is inserted into the connecting through hole. The rotating seat (9) has a tapered insertion groove (91) corresponding to and communicating with the connecting through hole. The end of the connecting shaft (52) away from the rotating shaft (5) is a tapered insertion head (53), which is non-rotatably fitted in the tapered insertion groove (91).

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