Built-in transmission gear structure for door closer

Abstract

The utility model particularly relates to the technical field of door closers, and discloses a built-in transmission gear structure for a door closer, which comprises a transmission component and an oil cylinder, the transmission component comprises a connecting rod, the end part of the connecting rod is fixedly provided with a rotating shaft, the outer surface of the rotating shaft is sleeved with a driving gear, and the top end of the oil cylinder is provided with a notch I for the rotating shaft to insert; a first limiting block sleeves the outer surface, close to the bottom end of the first notch, of the rotating shaft, a first clamping groove is formed in the top end of the first limiting block, and a first sealing ring is clamped in the first clamping groove. Through the arrangement of the first limiting block, the first clamping groove, the first sealing ring, the second clamping groove, the second sealing ring, the second limiting block, the third clamping groove and the third sealing ring, the external sizes of the first limiting block and the second limiting block are matched with the internal sizes of the two ends of the first notch, and the first sealing ring, the second sealing ring and the third sealing ring are all made of rubber materials and are in a circular ring shape; the sealing performance and the rotating stability of the rotating shaft penetrating through the first notch can be improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of door closers, and particularly relates to an internal transmission gear structure for a door closer. Background Art

[0002] A door closer is a hydraulic device similar to a spring on the door head. When the door is opened, it can be compressed and then released to automatically close the door, acting like a spring door, ensuring that after the door is opened, it can be accurately and timely closed to the initial position. The basic components of a hydraulic door closer include a support and guide member, a transmission gear, a return spring, a rack plunger, a housing, and a connecting rod. The housing and the connecting rod play the roles of fixing the door closer and connecting the door leaf and the door frame.

[0003] The existing internal transmission gear structure of a door closer is usually installed inside a hydraulic cylinder to transmit the oil pressure inside the cylinder, thereby driving the connecting rod to rotate and realizing the automatic closing of the door. When the internal transmission gear rotates, the gap between the rotating rod and the cylinder may increase after long-term friction, thus affecting the stability of the oil pressure inside the cylinder. Summary of the Utility Model

[0004] The utility model provides an internal transmission gear structure for a door closer, aiming to solve the problem that when the existing internal transmission gear rotates, the gap between the rotating rod and the cylinder may increase after long-term friction, thus affecting the stability of the oil pressure inside the cylinder.

[0005] The utility model is realized as follows: An internal transmission gear structure for a door closer includes a transmission assembly and a cylinder. The transmission assembly includes a connecting rod, a rotating shaft is fixedly provided at the end of the connecting rod, a driving gear is sleeved on the outer surface of the rotating shaft, a notch one is opened at the top end of the cylinder for the rotating shaft to be inserted, a chute is opened inside the cylinder and is communicated with the notch one, a limiting block one is sleeved on the outer surface of the rotating shaft near the bottom end of the notch one, a clamping groove one is opened at the top end of the limiting block one, a sealing ring one is clamped inside the clamping groove one, a clamping groove two is opened on the outer surface of the rotating shaft near the upper part of the limiting block one, a sealing ring two is clamped inside the clamping groove two, a limiting block two is sleeved on the outer surface of the rotating shaft near the top end of the notch one, a clamping groove three is opened on the side wall of the limiting block two, and a sealing ring three is clamped inside the clamping groove three.

[0006] Preferably, the limiting block one and the limiting block two are both fixedly connected with the rotating shaft to form an integral structure, and the external dimensions of the limiting block one and the limiting block two are both adapted to the internal dimensions at both ends of the notch one, improving the stability of the rotation of the rotating shaft.

[0007] Preferably, the first sealing ring, the second sealing ring, and the third sealing ring are all made of rubber and are circular rings. The first sealing ring, the second sealing ring, and the third sealing ring are respectively adapted to the internal dimensions of the first card slot, the second card slot, and the third card slot in sequence, improving the installation stability of the first sealing ring, the second sealing ring, and the third sealing ring.

[0008] Preferably, a plunger is slidably connected inside the chute. A through groove is formed at the top end of the plunger for the driving gear to be inserted. A rack is fixedly provided on the inner side wall of the through groove and meshes with the driving gear, realizing the driving of the driving gear.

[0009] Preferably, a needle roller bearing is installed at the inner bottom end of the chute close to the rotating shaft. The rotating shaft is rotatably connected in the middle of the needle roller bearing, improving the rotational stability of the bottom end of the rotating shaft.

[0010] Preferably, sliders are fixedly provided at both ends of the plunger. The external dimensions of the sliders are respectively adapted to the internal dimensions of the chute, improving the stability of the horizontal movement of the plunger.

[0011] Preferably, a return spring is fixedly provided on the inner side wall of the chute. The other end of the return spring is connected to the end of the slider, improving the stability of the return.

[0012] Compared with the prior art, the embodiments of the present application mainly have the following beneficial effects:

[0013] First, by providing a first limiting block, a first card slot, a first sealing ring, a second card slot, a second sealing ring, a second limiting block, a third card slot, and a third sealing ring, the external dimensions of the first limiting block and the second limiting block are respectively adapted to the internal dimensions at both ends of the first slot opening. The first sealing ring, the second sealing ring, and the third sealing ring are all made of rubber and are circular rings, which can improve the sealing performance of the rotating shaft passing through the first slot opening and the rotational stability. Secondly, the first sealing ring, the second sealing ring, and the third sealing ring are all circular rings. The first sealing ring, the second sealing ring, and the third sealing ring are respectively adapted to the internal dimensions of the first card slot, the second card slot, and the third card slot in sequence, which can improve the installation stability of the first sealing ring, the second sealing ring, and the third sealing ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a front view three-dimensional structural schematic diagram of the present utility model.

[0015] Figure 2 It is for the Figure 1 enlarged structural schematic diagram of part A in the present utility model.

[0016] Figure 3 It is a structural schematic diagram of the transmission component of the present utility model.

[0017] The reference numerals are: 1, transmission assembly; 101, connecting rod; 102, rotating shaft; 103, driving gear; 104, first limiting block; 105, first clamping groove; 106, first sealing ring; 107, second clamping groove; 108, second sealing ring; 109, second limiting block; 110, third clamping groove; 111, third sealing ring; 2, oil cylinder; 3, sliding groove; 4, sliding block; 5, plunger; 6, through groove; 7, rack; 8, return spring; 9, needle roller bearing; 10, first notch. Detailed implementation manners

[0018] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this application belongs; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above drawings are intended to cover non-exclusive inclusion. The terms "first", "second", etc. in the specification and claims of this application or the above drawings are used to distinguish different objects and not to describe a specific order.

[0019] References to "embodiments" herein mean that a particular feature, structure, or characteristic described in connection with the embodiments can be included in at least one embodiment of this application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0020] Please refer to Figures 1-3, the embodiments provided by the present utility model: An internal transmission gear structure for a door closer, including a transmission assembly 1 and an oil cylinder 2. The transmission assembly 1 includes a connecting rod 101. A rotating shaft 102 is fixedly provided at the end of the connecting rod 101 by welding. The connecting rod 101 and the rotating shaft 102 form a 90-degree angle. A driving gear 103 is sleeved on the outer surface of the rotating shaft 102 by welding. A notch 10 is opened at the top end of the oil cylinder 2 for the rotating shaft 102 to be inserted. A sliding groove 3 is opened inside the oil cylinder 2 and is communicated with the notch 10. A limiting block 104 is sleeved on the outer surface of the rotating shaft 102 near the bottom end of the notch 10. A first clamping groove 105 is opened at the top end of the limiting block 104. A first sealing ring 106 is clamped inside the first clamping groove 105. A second clamping groove 107 is opened on the outer surface of the rotating shaft 102 near the upper part of the limiting block 104. A second sealing ring 108 is clamped inside the second clamping groove 107. A limiting block 109 is sleeved on the outer surface of the rotating shaft 102 near the top end of the notch 10. Both the limiting block 104 and the limiting block 109 are fixedly connected to the rotating shaft 102 to form an integral structure. The outer dimensions of both the limiting block 104 and the limiting block 109 are adapted to the internal dimensions at both ends of the notch 10, improving the stability of the rotation of the rotating shaft 102. A third clamping groove 110 is opened on the side wall of the limiting block 109. A third sealing ring 111 is clamped inside the third clamping groove 110. The first sealing ring 106, the second sealing ring 108, and the third sealing ring 111 are all made of rubber and are in a circular ring shape. The first sealing ring 106, the second sealing ring 108, and the third sealing ring 111 are respectively adapted to the internal dimensions of the first clamping groove 105, the second clamping groove 107, and the third clamping groove 110, improving the installation stability of the first sealing ring 106, the second sealing ring 108, and the third sealing ring 111. The first sealing ring 106, the second sealing ring 108, and the third sealing ring 111 all have elasticity and can seal the middle of the notch 10, improving the sealing performance and stability of the rotation of the rotating shaft 102 inside the notch 10.

[0021] A plunger 5 is slidably connected inside the sliding groove 3. A through groove 6 is opened at the top end of the plunger 5 for the driving gear 103 to be inserted. A rack 7 is fixedly provided on the inner side wall of the through groove 6 and meshes with the driving gear 103, realizing the driving of the driving gear 103. A needle roller bearing 9 is installed at the inner bottom end of the sliding groove 3 close to the rotating shaft 102. The rotating shaft 102 is rotatably connected in the middle of the needle roller bearing 9, improving the stability of the rotation of the bottom end of the rotating shaft 102.

[0022] Sliding blocks 4 are fixedly provided at both ends of the plunger 5. The outer dimensions of the sliding blocks 4 are respectively adapted to the internal dimensions of the sliding groove 3, improving the stability of the horizontal movement of the plunger 5. A return spring 8 is fixedly provided on the inner side wall of the sliding groove 3. The other end of the return spring 8 is connected to the end of the sliding block 4. The elastic force acts on the side wall of the plunger 5 to balance the horizontal thrust of the oil pressure acting on the other end of the sliding block 4, improving the stability of the return of the plunger 5.

[0023] Working principle: When the built-in transmission gear structure for a door closer is in use, the operator fixes the transmission component 1 on the door leaf through bolts, rotatably connects the connecting rod 101 to the door frame through a piston connecting rod, fills the inside of the chute 3 with hydraulic oil to push the plunger 5 to move horizontally inside the chute 3, so as to drive the rack 7 to move horizontally and drive the driving gear 103 to rotate inside the chute 3, thereby driving the rotating shaft 102 and the connecting rod 101 to rotate synchronously, so as to realize the automatic closing of the door. The outer dimensions of the first limiting block 104 and the second limiting block 109 are both adapted to the inner dimensions at both ends of the first notch 10. The first sealing ring 106, the second sealing ring 108 and the third sealing ring 111 are all made of rubber and are in a circular ring shape, which can improve the sealing performance of the rotating shaft 102 passing through the first notch 10 and the stability of rotation.

[0024] It should be noted that for the foregoing embodiments, for the sake of simple description, they are all expressed as a series of action combinations. However, those skilled in the art should know that the present invention is not limited by the described action sequence, because according to the present invention, certain steps may be adopted in other sequences or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily essential to the present invention.

[0025] In several embodiments provided by the present application, it should be understood that the disclosed device can be implemented in other ways. For example, the device embodiments described above are only illustrative. For example, the above division of units can have other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed coupling or communication connection between each other can be through some interfaces. The indirect coupling or communication connection between devices or units can be in the form of telecommunications or other forms.

[0026] The units described above as separate components may or may not be physically separated. The components displayed as units may or may not be physical units, that is, they can be located in one place, or they can be distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0027] The above embodiments are only used to illustrate the technical solutions of the present utility model, rather than limiting the protection scope of the utility model. Obviously, the described embodiments are only partial embodiments of the present utility model, rather than all embodiments. Based on these embodiments, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present utility model. Although the present utility model has been described in detail with reference to the above embodiments, those of ordinary skill in the art can still, without conflict and without creative efforts, combine, add or delete the features in the embodiments of the present utility model according to the circumstances or make other adjustments, so as to obtain different technical solutions that essentially do not depart from the concept of the present utility model, and these technical solutions also fall within the scope of protection of the present utility model.

Claims

1. A built-in transmission gear structure for a door closer, characterized in that: The invention comprises a transmission assembly (1) and an oil cylinder (2): the transmission assembly (1) comprises a connecting rod (101), a rotating shaft (102) is fixedly arranged at the end of the connecting rod (101), a driving gear (103) is sleeved on the outer surface of the rotating shaft (102), a slot (10) is provided at the top end of the oil cylinder (2) for the rotating shaft (102) to be inserted, a sliding groove (3) is provided inside the oil cylinder (2) and is connected to the slot (10), a limiting block (104) is sleeved on the outer surface of the rotating shaft (102) near the bottom end of the slot (10), and the limiting block (104) A slot 1 (105) is provided at the top of the rotating shaft (102), a sealing ring 1 (106) is clamped inside the slot 1 (105), a slot 2 (107) is provided on the outer surface of the rotating shaft (102) near the upper side of the limiting block 1 (104), a sealing ring 2 (108) is clamped inside the slot 2 (107), a limiting block 2 (109) is sleeved on the outer surface of the rotating shaft (102) near the top of the slot 1 (10), a slot 3 (110) is provided on the side wall of the limiting block 2 (109), a sealing ring 3 (111) is clamped inside the slot 3 (110).

2. The built-in transmission gear structure for a door closer according to claim 1, characterized in that: The limit block 1 (104) and the limit block 2 (109) are both fixedly connected to the rotating shaft (102) to form an integrated structure, and the external dimensions of the limit block 1 (104) and the limit block 2 (109) are both compatible with the internal dimensions of the two ends of the slot 1 (10).

3. The built-in transmission gear structure for a door closer according to claim 1, characterized in that: The sealing ring 1 (106), the sealing ring 2 (108) and the sealing ring 3 (111) are all made of rubber and are in the shape of circular rings. The sealing ring 1 (106), the sealing ring 2 (108) and the sealing ring 3 (111) are respectively adapted to the internal dimensions of the card slot 1 (105), the card slot 2 (107) and the card slot 3 (110).

4. The built-in transmission gear structure for a door closer according to claim 3, characterized in that: The interior of the slide groove (3) is slidably connected with a plunger (5), the top end of the plunger (5) is provided with a through groove (6) for the drive gear (103) to be inserted, and the inner side wall of the through groove (6) is fixedly provided with a rack (7) which meshes with the drive gear (103).

5. The built-in transmission gear structure for a door closer according to claim 4, characterized in that: A needle bearing (9) is installed at the inner bottom end of the slide groove (3) close to the rotating shaft (102), and the rotating shaft (102) is rotatably connected in the middle of the needle bearing (9).

6. The built-in transmission gear structure for a door closer according to claim 4, characterized in that: Slide blocks (4) are fixedly provided at both ends of the plunger (5), and the external dimensions of the slide blocks (4) are compatible with the internal dimensions of the slide groove (3).

7. The built-in transmission gear structure for a door closer according to claim 6, characterized in that: A return spring (8) is fixedly arranged on the inner side wall of the slide groove (3), and the other end of the return spring (8) is connected to the end of the slide block (4).

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