Door closer and piston thereof

Abstract

The piston comprises a piston body of a cylindrical structure, a rolling wheel groove is formed in the end face of one side of the piston body in a concave mode, a rolling wheel is rotationally arranged in the rolling wheel groove, and a semicircular bearing is arranged between the inner wall of the rolling wheel groove and the rolling wheel. The semicircular bearing comprises an outer ring embedded into the roller groove, a first arc-shaped groove is formed in the inner wall of the outer ring in a concave mode, and a plurality of roller pins are arranged in the first groove. The door closer and the piston thereof are simple in structure, and the semicircular bearing provides effective support for the roller.

Description

Technical Field

[0001] This application relates to the technical field of door closers, and particularly to a door closer and its piston. Background Art

[0002] As a necessary facility device for modern buildings, door closers have been widely used in various fields of society. With the continuous development and progress of society, the country has higher and higher requirements for fire protection and security. Many passage doors and fire doors need to be installed with door closers. Currently, the door closers on the market mainly include hydraulic door closers and electric door closers. Among them, during the opening / closing process of a hydraulic door closer, the camshaft rotates and presses the piston. One end of the piston close to the camshaft is provided with rollers to avoid interfering with the free rotation of the camshaft. However, the pressure acting along the axial direction of the piston on the rollers will cause excessive pressure between the rollers and the roller shafts, as well as between the roller shafts and the piston, resulting in damage to the roller shafts. Therefore, improvements are needed. Content of the Utility Model

[0003] The purpose of the present utility model is to provide a door closer and its piston to overcome the deficiencies in the prior art.

[0004] To achieve the above purpose, the present utility model provides the following technical solutions:

[0005] The present utility model discloses a piston, which includes a piston body with a cylindrical structure. One side end face of the piston body is recessed with a roller groove. A roller is rotatably arranged in the roller groove. A semi-circular bearing is arranged between the inner wall of the roller groove and the roller. The semi-circular bearing includes an outer ring embedded in the roller groove. The inner wall of the outer ring is recessed with an arc-shaped first groove. A plurality of rolling needles are arranged in the first groove and are in rolling contact with the surface of the roller.

[0006] Further, in the above piston, adjacent rolling needles are arranged at intervals.

[0007] Further, in the above piston, there is a gap between the rolling needle and the bottom wall of the first groove.

[0008] Further, in the above piston, stoppers are respectively arranged at both ends of the semi-circular bearing, and the stoppers are embedded in the roller groove.

[0009] Further, in the above piston, the side surface of the stopper close to the roller protrudes from the inner wall of the roller groove and is spaced from the roller.

[0010] Further, in the above piston, a first flow channel is arranged along the axial direction of the piston body, and the first flow channel communicates with the roller groove.

[0011] Furthermore, in the above-mentioned piston, the inner wall of the roller groove is recessed with a second groove connected to the first flow channel.

[0012] Furthermore, in the above-mentioned piston, a second flow channel is concavely provided in the circumferential surface of the piston body and is arranged along an end surface of one side of the piston body facing away from the roller.

[0013] Furthermore, in the above-mentioned piston, an annular sealing groove is concavely provided in the circumferential surface of the piston body.

[0014] The utility model also discloses a door closer, comprising the piston.

[0015] Compared with the prior art, the door closer and the piston of the utility model have simple structures, and the semicircular bearing provides support for the roller, thereby increasing the force-bearing area of ​​the roller, reducing the possibility of roller damage, and extending the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 Shown is a schematic structural diagram of a piston in a specific embodiment of the utility model.

[0018] Figure 2 Shown is a cross-sectional schematic diagram of a piston in a specific embodiment of the utility model.

[0019] Figure 3 Shown is an exploded schematic diagram of a piston in a specific embodiment of the utility model.

[0020] Figure 4 Shown is a structural schematic diagram of a semicircular bearing in a specific embodiment of the utility model.

[0021] Figure 5 Shown is a structural schematic diagram of a semicircular bearing in another specific embodiment of the utility model. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to describe the technical solutions in the embodiments of the utility model in detail. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] Combined with Figures 1 to 5 As shown, a piston includes a piston body 1 with a cylindrical structure. An inner concave roller groove 11 is provided on one end face of the piston body 1. A roller 2 is rotatably arranged in the roller groove 11. A semi-circular bearing 3 is arranged between the inner wall of the roller groove 11 and the roller 2. The semi-circular bearing 3 includes an outer ring 31 embedded in the roller groove 11. An arc-shaped first groove is concavely provided on the inner wall of the outer ring 31. A number of rolling needles 32 that rollingly abut against the surface of the roller 2 are arranged in the first groove.

[0024] In this technical solution, a U-shaped opening groove is concavely provided at one end of the piston body to be used as the roller groove. The semi-circular bearing is embedded in the inner wall of the roller groove by conventional interference fit or other means. The rolling needles are parallel to the axial direction of the roller and rollingly abut against the surface of the roller. U-shaped grooves corresponding to the roller shafts of the roller are respectively provided on both side walls of the roller groove, and can accommodate the rotation of the roller shafts of the roller. When the camshaft rotates, the rolling needles and the roller rollingly abut to provide support for the roller. There is no pressure between the roller and the roller shaft and between the roller shaft and the piston body, avoiding damage and thus prolonging the overall service life of the piston.

[0025] Exemplarily, combined with Figures 1 to 5 As shown, the adjacent rolling needles 32 are arranged at intervals.

[0026] In this technical solution, the adjacent rolling needles are arranged at intervals to avoid the jamming phenomenon caused by the extrusion between the rolling needles.

[0027] Exemplarily, combined with Figures 1 to 5 As shown, there is an interval between the rolling needle 32 and the bottom wall of the first groove.

[0028] In this technical solution, the rolling needle is suspended to avoid the jamming phenomenon caused by the extrusion between the rolling needle and the bottom wall of the first groove.

[0029] Exemplarily, combined with Figure 4 and Figure 5 As shown, a U-shaped opening groove or a through hole and other structures are provided in the side wall of the first groove. The two ends of the rolling needle respectively protrude connecting heads and are rotatably arranged in the corresponding U-shaped opening groove or through hole to ensure the free rotation of the rolling needle. At the same time, there is an interval between the rolling needles and between the rolling needle and the bottom wall.

[0030] Exemplarily, combined with Figures 1 to 3 As shown, stoppers 4 are respectively arranged at both ends of the semi-circular bearing 3, and the stoppers are embedded in the roller groove 11.

[0031] In this technical solution, the stopper is embedded in the inner wall of the roller groove by conventional interference fit or other means and does not protrude from the end face of the piston body, without interfering with the normal use of the piston.

[0032] Exemplarily, combined withFigure 2 As shown, the side of the stopper 4 close to the roller 2 protrudes from the inner wall of the roller groove 11 and is spaced apart from the roller 2 .

[0033] In this technical solution, two blocks are respectively arranged on both sides of the opening end of the roller groove, which reduces the possibility of foreign matter entering the semicircular bearing, and the blocks do not interfere with the free rotation of the roller.

[0034] For example, in combination Figures 1 to 3 As shown, a first flow channel 12 is provided in the piston body 1 along its axial direction, and the first flow channel 12 is connected to the roller groove 11 .

[0035] In this technical solution, the first flow channel is used to install valves such as a pressure relief valve / a one-way valve, and the specific structure and principle are prior art and will not be described in detail here.

[0036] For example, in combination Figures 1 to 3 As shown, the inner wall of the roller groove 11 is recessed with a second groove 13 connected to the first flow channel.

[0037] In this technical solution, the second groove connects the first flow channel to the side of the piston body close to the roller, thereby ensuring the normal operation of the valve in the first flow channel.

[0038] For example, in combination Figures 1 to 3 As shown, a second flow channel 14 is concavely provided in the circumferential surface of the piston body 1 and is arranged along the end surface of the piston body 1 facing away from the roller 2 .

[0039] In this technical solution, the second flow channel is arranged in conjunction with the hole / flow channel in the door closer housing. The specific structure and principle are prior art and will not be described in detail here.

[0040] For example, in combination Figures 1 to 3 As shown, an annular sealing groove 15 is concavely provided on the circumferential surface of the piston body 1, and a limiting groove corresponding to the door closer spring is concavely provided on the end surface of the piston body 1 facing away from the roller 2 to avoid failure caused by spring tilt.

[0041] In this technical solution, the sealing groove is used to install a conventional sealing ring to improve the sealing between the piston body and the door closer housing.

[0042] A door closer comprises a housing, wherein the piston is slidably arranged in the housing of the door closer, and the roller and its roller shaft will not be damaged due to the extrusion of the camshaft, thereby extending their service life, thereby extending the service life of the door closer.

[0043] In summary, the door closer and the piston of the utility model have a simple structure, and the semicircular bearing provides support for the roller, thereby increasing the force-bearing area of ​​the roller, reducing the possibility of roller damage, and extending the service life.

[0044] It should be noted that in this text, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the existence of additional identical elements in the process, method, article or device comprising the said element.

[0045] The above are only specific embodiments of the present application. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present application, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present application.

Claims

1. A piston, characterized in that: A piston body is provided with a cylindrical structure, one side end surface of the piston body is concavely provided with a roller groove, a roller is rotatably provided in the roller groove, a semicircular bearing is provided between the inner wall of the roller groove and the roller, the semicircular bearing includes an outer ring embedded in the roller groove, the inner wall of the outer ring is concavely provided with a first arc-shaped groove, and a plurality of roller needles are provided in the first groove and roll against the surface of the roller.

2. The piston according to claim 1, characterized in that: Adjacent roller needles are arranged at intervals.

3. The piston according to claim 1, characterized in that: The rolling needle and the bottom wall of the first groove are spaced apart.

4. The piston according to claim 1, characterized in that: Stoppers are respectively arranged at both ends of the semicircular bearing, and the stoppers are embedded in the roller grooves.

5. The piston according to claim 4, characterized in that: The side surface of the stopper close to the roller protrudes from the inner wall of the roller groove and is spaced apart from the roller.

6. The piston according to claim 1, characterized in that: A first flow channel is arranged in the piston body along its axial direction, and the first flow channel is connected to the roller groove.

7. The piston according to claim 6, characterized in that: The inner wall of the roller groove is recessed with a second groove connected to the first flow channel.

8. The piston according to claim 1, characterized in that: A second flow channel is concavely provided in the circumferential surface of the piston body and is arranged along an end surface of one side of the piston body away from the roller.

9. The piston according to claim 1, characterized in that: An annular sealing groove is concavely provided in the circumferential surface of the piston body.

10. A door closer, characterized in that: The invention comprises a piston as claimed in any one of claims 1 to 7.

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