Oil-free heavy hinge
By adding a tapered shaft and shaft seat to the mid-swing shaft and side shaft of the heavy-duty hinge, and using the rotational coordination of the tapered head and groove, the problems of lubricating oil leakage and abnormal noise are solved, and an oil-free and silent heavy-duty hinge design is achieved.
Patent Information
- Application Number
- CN202420755115.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-12
- Publication Date
- 2025-03-28
- Estimated Expiration
- 2034-04-12
AI Technical Summary
Existing heavy-duty hinges are prone to lubricating oil leakage and abnormal noise during use, resulting in poor rotation.
An oil-free heavy-duty hinge is designed. By adding a tapered rotation shaft to the end of the mid-rotation shaft and adding a shaft seat to the edge shaft, the tapered head on the tapered rotation shaft and the tapered groove on the shaft seat are used for rotation matching to achieve a smooth rotation without lubricating oil.
This design ensures smooth rotation of the rotary shaft without lubricating oil, reduces noise during rotation, and improves the structural strength and load-bearing capacity of the hinge.
Smart Images
Figure CN222686426U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of door and window hardware, and more specifically, to an oil-free heavy-duty hinge. Background Art
[0002] In order to ensure the stable rotation of steel doors, heavy-duty hinges are usually required to be assembled to the door frame. Heavy-duty hinges generally use metal leaves, which support the central shaft fixed on the hinge of the door leaf through the side shaft fixed on the hinge of the door frame, thereby bearing the gravity of the door leaf.
[0003] In order to facilitate the rotation of the shaft, lubricating oil (or grease) must be pre-filled between the side shaft and the middle shaft to ensure smooth operation. However, during use, the above hinges may leak lubricating oil (or grease). Once the lubricating oil dries up or leaks out, the above hinges will produce abnormal noise. Utility Model Content
[0004] The technical problem to be solved by the utility model is to provide an oil-free heavy-duty hinge in view of the problems of oil leakage and abnormal noise existing in the above-mentioned hinge.
[0005] The utility model solves the above-mentioned technical problem by providing an oil-free heavy-duty hinge, comprising a first hinge piece and a second hinge piece, wherein the first hinge piece is provided with a central rotating shaft, the second hinge piece is provided with two side rotating shafts, and the first hinge piece and the second hinge piece are assembled together by means of the central rotating shaft and the two side rotating shafts rotating in cooperation; the central rotating shaft comprises a first shaft body and conical rotating shafts respectively located at two ends of the first shaft body, the elastic modulus of the conical rotating shaft is smaller than the elastic modulus of the first shaft body, and the free end of the conical rotating shaft has a conical head; each of the side rotating shafts comprises a second shaft body and a shaft seat mounted on the second shaft body, the elastic modulus of the shaft seat is smaller than the elastic modulus of the second shaft body, and the top surface of the shaft seat has a conical groove matched with the conical head; when the first hinge piece and the second hinge piece are assembled together, the conical surface of the conical head abuts against the conical side wall of the conical groove of the shaft seat, and when the first hinge piece and the second hinge piece rotate relatively, the conical rotating shaft rotates synchronously with the shaft seat.
[0006] As a further improvement of the present utility model, the first shaft body includes a main shaft section, and the two ends of the main shaft section respectively have a fixed shaft section and a pin shaft section connected in sequence, and the radial dimensions of the main shaft section, the fixed shaft section and the pin shaft section decrease in sequence; the conical rotating shaft has a first blind hole adapted to the pin shaft section, and the first shaft body is tightly fitted and fixed to the conical rotating shaft in such a way that the pin shaft section is inserted into the first blind hole.
[0007] As a further improvement of the present invention, the outer peripheral surface of the pin shaft section has an anti-slip structure.
[0008] As a further improvement of the present invention, each of the second shaft bodies includes a second blind hole that is compatible with the tapered rotating shaft; the shaft seat is columnar that is compatible with the second blind hole, and the axial dimension of the shaft seat is smaller than the axial dimension of the second blind hole; the tapered groove is located on the top surface of the shaft seat, and the shaft seat is assembled into the second blind hole with the bottom surface facing away from the bottom of the second blind hole and is tightly fixed to the second shaft body.
[0009] As a further improvement of the present invention, the portion of the conical shaft except the conical head is cylindrical, the second blind hole is a cylindrical hole, the diameter of the conical shaft is less than or equal to the aperture of the second blind hole, and when the first hinge piece and the second hinge piece are assembled together, the conical shaft is inserted into the second blind hole.
[0010] As a further improvement of the present invention, the fixed shaft section is cylindrical, the diameter of the fixed shaft section is smaller than the diameter of the second blind hole, and when the first hinge piece and the second hinge piece are assembled together, a part of the fixed shaft section is inserted into the second blind hole.
[0011] As a further improvement of the utility model, the top of the conical head has a radial end face, the bottom of the conical groove has a groove, and when the first hinge piece and the second hinge piece are assembled together, the radial end face is embedded in the groove.
[0012] As a further improvement of the present invention, the elastic modulus of the tapered rotating shaft and the shaft seat are both less than 10 GPa, and the dynamic friction coefficient between the tapered rotating shaft and the shaft seat is less than 0.1.
[0013] As a further improvement of the present invention, the first hinge piece is in a sheet shape and has a plurality of first screw holes.
[0014] As a further improvement of the present invention, the second hinge piece is in a sheet shape and has a plurality of second screw holes.
[0015] The utility model has the following beneficial effects: by adding a tapered rotating shaft at the end of the central rotating shaft and adding a shaft seat to the side rotating shaft, and by the rotational fit of the tapered head on the tapered rotating shaft and the tapered groove on the shaft seat, the central rotating shaft can be ensured to rotate smoothly without lubricating oil, and the noise generated during rotation can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It is a schematic diagram of an oil-free heavy-duty hinge provided by an embodiment of the utility model.
[0017] Figure 2It is a partial cross-sectional structural schematic diagram of an oil-free heavy-duty hinge provided by an embodiment of the utility model.
[0018] Figure 3 It is a schematic diagram of the exploded structure of the oil-free heavy-duty hinge provided by the embodiment of the utility model.
[0019] Figure 4 It is a schematic cross-sectional structure diagram of an oil-free heavy-duty hinge in a disassembled state provided by an embodiment of the utility model. DETAILED DESCRIPTION
[0020] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.
[0021] like Figure 1 , Figure 2 The figure is a schematic diagram of an oil-free heavy-duty hinge provided by an embodiment of the utility model, and the oil-free heavy-duty hinge can be applied to the assembly of heavy-duty door panels such as steel doors. The oil-free heavy-duty hinge of this embodiment includes a first hinge piece 11 and a second hinge piece 12, wherein the first hinge piece 11 has a central rotating shaft 13 (for example, the central rotating shaft 13 can be welded to the first hinge piece 11), and the second hinge piece 12 has two side rotating shafts 14 (for example, the side rotating shafts 14 can be welded to the second hinge piece 12), the central rotating shaft 13 and the side rotating shafts 14 are respectively columnar, and the first hinge piece 11 and the second hinge piece 12 are assembled together by the central rotating shaft 13 and the two side rotating shafts 14 rotating together.
[0022] Similar to the existing hinges, the first hinge piece 11 is in the form of a sheet and is made of a high-strength hard metal material such as stainless steel or brass, and has a plurality of first screw holes 111 (specifically, countersunk holes) on the first hinge piece 11. The first hinge piece 11 can be connected and fixed to the door leaf or door frame by screws passing through the first screw holes 111; the second hinge piece 12 is also in the form of a sheet and is made of a high-strength hard metal material such as stainless steel or brass, and has a plurality of second screw holes 121 (specifically, countersunk holes) on the second hinge piece 12. The second hinge piece 12 can be connected and fixed to the door leaf or door frame by screws passing through the second screw holes 121. The central rotating shaft 13 on the first hinge piece 11 and the two side rotating shafts 14 on the second hinge piece 12 are coaxial and can rotate relative to each other, thereby realizing the opening and closing of the oil-free heavy-duty hinge and the opening and closing of the door leaf. Of course, in practical applications, the first hinge piece 11 and the second hinge piece 12 may also adopt other existing hinge structures, which will not be described in detail here.
[0023] Combination Figure 3As shown, the central rotating shaft 13 comprises a first shaft body 131 and two tapered rotating shafts 132, wherein the two tapered rotating shafts 132 are respectively located at two ends of the first shaft body 131, and the free end of each tapered rotating shaft 132 has a tapered head 1321, and the elastic modulus of the tapered rotating shaft 132 is smaller than the elastic modulus of the first shaft body 131. Specifically, the first shaft body 131 can be made of the same material as the first hinge piece 11, and its elastic modulus is relatively large, for example, its elastic modulus is not less than 100Gpa; while the tapered rotating shaft 132 can be made of relatively wear-resistant engineering plastics (such as polyamide, polycarbonate, polyoxymethylene, modified polyphenylene ether, thermoplastic polyester, polyimide, polyphenylene sulfide, polysulfone, aromatic polyamide, polyarylate, polyphenylene ester, polyaryletherketone, liquid crystal polymer and fluororesin, etc.), and its elastic modulus is relatively small, for example, its elastic modulus is less than 10Gpa.
[0024] Combination Figure 3 As shown, each side shaft 14 includes a second shaft body 141 and a shaft seat 142, wherein the top surface of the shaft seat 142 has a tapered groove 1421 adapted to the tapered head 1321, and the shaft seat 142 is installed in the second shaft body 141, and the elastic modulus of the shaft seat 142 is smaller than the elastic modulus of the second shaft body 141. Specifically, the second shaft body 141 can be made of the same material as the second hinge piece 12, and its elastic modulus is relatively large, for example, its elastic modulus is not less than 100Gpa; while the shaft seat 142 can be made of relatively wear-resistant engineering plastics (such as polyamide, polycarbonate, polyoxymethylene, modified polyphenylene ether, thermoplastic polyester, polyimide, polyphenylene sulfide, polysulfone, aromatic polyamide, polyarylate, polyphenylene ester, polyaryletherketone, liquid crystal polymer and fluororesin, etc.), and its elastic modulus is relatively small, for example, its elastic modulus is less than 10Gpa.
[0025] When the first hinge piece 11 and the second hinge piece 12 are assembled together, the conical surface of the conical head 1321 abuts against the conical side wall of the conical groove 1421 of the shaft seat 142. Figure 4 Furthermore, when the first hinge piece 11 and the second hinge piece 12 rotate relative to each other, the conical shaft 132 and the shaft seat 142 rotate synchronously, that is, when the first hinge piece 11 and the second hinge piece 12 rotate relative to each other, the first shaft body 131 and the conical shaft 132 do not rotate relative to each other, and the second shaft body 141 and the shaft seat 142 do not rotate relative to each other.
[0026] The above oil-free heavy-duty hinge can ensure the smooth rotation of the central shaft 13 without lubricating oil by adding a conical shaft 132 to the end of the central shaft 13 and adding a shaft seat 142 to the side shaft 14, and by the rotational cooperation of the conical head 1321 on the conical shaft 132 and the conical groove 1421 on the shaft seat 142 (the cooperation structure of the conical head 1321 and the conical groove 1421 prevents the central shaft 13 from tilting during the rotation process), and at the same time, since the elastic modulus of the conical shaft 132 and the shaft seat 142 is relatively small, the noise generated when the central shaft 13 rotates relative to the side shaft 14 can be reduced. In addition, the cooperation structure of the conical head 1321 and the conical groove 1421 is also conducive to dispersing pressure and achieving greater load-bearing.
[0027] In one embodiment of the utility model, the first hinge piece 11, the second hinge piece 12, the first shaft body 131 and the second shaft body 141 can be made of the same material, and the tapered shaft 132 and the shaft seat 142 can also be made of the same material. In this way, the oil-free heavy-duty hinge can be oil-free and silent while ensuring the structural strength. To ensure smooth rotation, the dynamic friction coefficient between the tapered shaft 132 and the shaft seat 142 is preferably less than 0.1, which can be achieved by selecting the constituent materials and controlling the surface smoothness. Of course, in actual applications, the dynamic friction coefficient between the tapered shaft 132 and the shaft seat 142 can also be the same as the structure of the corresponding part in the existing hinge.
[0028] like Figure 3 As shown, in one embodiment of the utility model, the tapered shaft 132 can be connected to the end of the first shaft body 131 in the following manner: the first shaft body 131 includes a main shaft section 1311, and the two ends of the main shaft section 1311 respectively have a fixed shaft section 1312 and a pin shaft section 1313 connected in sequence, and the main shaft section 1311, the fixed shaft section 1312 and the pin shaft section 1313 are coaxial, and their radial dimensions are reduced in sequence, thereby forming a step shape; accordingly, a section of the tapered shaft 132 facing away from the tapered head 1321 has a first blind hole 1322, and the first blind hole 1322 is coaxial with the tapered shaft 132, and the shape and size of the first blind hole 1322 are adapted to the shape and size of the pin shaft section 1313 on the first shaft body 131, and the first shaft body 131 is tightly fitted and fixed to the tapered shaft 132 in a manner that the pin shaft section 1313 is inserted into the first blind hole 1322.
[0029] Since the elastic modulus of the tapered shaft 132 is relatively small, when it is tightly matched with the pin section 1313, the relative rotation between it and the pin section 1313 can be reduced. In particular, the main shaft section 1311, the fixed shaft section 1312 and the pin section 1313 are an integrated structure, for example, the main shaft section 1311, the fixed shaft section 1312 and the pin section 1313 can be integrally cast, or the fixed shaft section 1312 and the pin section 1313 can be directly formed at both ends of the first shaft body 131 by cutting or other processing. Of course, in practical applications, the tapered shaft 132 can also be connected to the end of the first shaft body 131 by other means, such as gluing.
[0030] To further avoid relative rotation between the pin section 1313 and the tapered shaft 132, in one embodiment of the present invention, the outer circumference of the pin section 1313 has an anti-slip structure, for example, the outer circumference of the pin section 1313 may be knurled or roughened or have multiple axial ridges.
[0031] In one embodiment of the utility model, in the above-mentioned side rotating shaft 14, each second shaft body 141 includes a second blind hole 1411, the shape and size of the inner wall of the second blind hole 1411 are adapted to the shape and size of the outer periphery of the tapered rotating shaft 132, and the second blind holes 1411 on the two side rotating shafts 14 are opposite. The shaft seat 142 is cylindrical, and its radial shape and size are adapted to the radial shape and size of the second blind hole 1411, and the axial size of the shaft seat 142 is smaller than the axial size of the second blind hole 1411. The tapered groove 1421 is located on the top surface of the shaft seat 142, and the shaft seat 142 is assembled into the second blind hole 1411 in a manner that the bottom surface faces away from the bottom of the second blind hole 1411 and is tightly fitted and fixed with the second shaft body 141.
[0032] Since the elastic modulus of the shaft seat 142 is relatively small, when it is tightly matched with the second shaft body 141, the relative rotation between the shaft seat 142 and the second shaft body 141 can be reduced. Of course, in practical applications, the shaft seat 142 can also be connected to the second shaft body 141 by other means, such as gluing.
[0033] In one embodiment of the utility model, the portion of the tapered shaft 132 except the tapered head 1321 is cylindrical, and accordingly, the second blind hole 1411 on the second shaft body 141 is cylindrical, and the diameter of the main portion of the tapered shaft 132 is less than or equal to the aperture of the second blind hole 1411. When the first hinge piece 11 and the second hinge piece 12 are assembled together, the tapered shaft 132 is inserted into the second blind hole 1411.
[0034] Through the above structure, the bonding strength between the central rotating shaft 13 and the side rotating shaft 14 can be improved, and due to the matching structure of the conical head 1321 and the conical groove 1421, the first shaft body 131 will not tilt during rotation, and the local pressure between the outer wall of the conical rotating shaft 132 and the inner wall of the second blind hole 1411 is uneven, thereby reducing the generation of abnormal noise during the rotation of the central rotating shaft.
[0035] In one embodiment of the utility model, the fixed shaft section 1312 is cylindrical, the diameter of the fixed shaft section 1312 is smaller than the diameter of the second blind hole 1411 , and when the first hinge piece 11 and the second hinge piece 12 are assembled together, a portion of the fixed shaft section 1312 is inserted into the second blind hole 1411 .
[0036] Under normal circumstances, due to the matching structure of the conical head 1321 and the conical groove 1421, the outer periphery of the fixed shaft section 1312 will not contact the inner wall of the second blind hole 1411, so that no abnormal sound will be generated during the rotation of the rotating shaft.
[0037] In one embodiment of the utility model, the top of the conical head 1321 of the conical shaft 132 has a radial end face, and correspondingly, the bottom of the conical groove 1421 of the shaft seat 142 has a groove, and when the first hinge piece 11 and the second hinge piece 12 are assembled together, the radial end face of the top of the conical head 1321 is embedded in the groove at the bottom of the conical groove 1421, that is, the diameter of the radial end face is smaller than the diameter of the groove. The above structure is not only conducive to the assembly of the central shaft 13 to the side shaft 14, but also ensures that the two can be assembled smoothly even if there is a size deviation between the conical head 1321 and the conical groove 1421.
[0038] The above is only a preferred specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.
Claims
1. An oil-free heavy-duty hinge, comprising a first hinge piece and a second hinge piece, wherein the first hinge piece has a central rotating shaft, the second hinge piece has two side rotating shafts, and the first hinge piece and the second hinge piece are assembled together by rotating the central rotating shaft and the two side rotating shafts; characterized in that: The central rotating shaft includes a first shaft body and conical rotating shafts respectively located at both ends of the first shaft body, the elastic modulus of the conical rotating shaft is smaller than the elastic modulus of the first shaft body, and the free end of the conical rotating shaft has a conical head; each of the side rotating shafts includes a second shaft body and an axle seat installed on the second shaft body, the elastic modulus of the axle seat is smaller than the elastic modulus of the second shaft body, and the top surface of the axle seat has a conical groove matched with the conical head; when the first hinge piece and the second hinge piece are assembled together, the conical surface of the conical head is against the conical side wall of the conical groove of the axle seat, and when the first hinge piece and the second hinge piece rotate relative to each other, the conical rotating shaft and the axle seat rotate synchronously.
2. The oil-free heavy-duty hinge according to claim 1, characterized in that: The first shaft body includes a main shaft section, and the two ends of the main shaft section respectively have a fixed shaft section and a pin shaft section connected in sequence, and the radial dimensions of the main shaft section, the fixed shaft section and the pin shaft section decrease in sequence; the tapered rotating shaft has a first blind hole adapted to the pin shaft section, and the first shaft body is tightly fitted and fixed to the tapered rotating shaft in a manner that the pin shaft section is inserted into the first blind hole.
3. The oil-free heavy-duty hinge according to claim 2, characterized in that: The outer peripheral surface of the pin shaft section has an anti-slip structure.
4. The oil-free heavy-duty hinge according to claim 2, characterized in that: Each of the second shaft bodies includes a second blind hole that is compatible with the tapered rotating shaft; the shaft seat is columnar that is compatible with the second blind hole, and the axial dimension of the shaft seat is smaller than the axial dimension of the second blind hole; the tapered groove is located on the top surface of the shaft seat, and the shaft seat is assembled into the second blind hole with the bottom surface facing away from the bottom of the second blind hole and is tightly fixed to the second shaft body.
5. The oil-free heavy-duty hinge according to claim 4, characterized in that: The portion of the conical shaft except the conical head is cylindrical, the second blind hole is cylindrical, the diameter of the conical shaft is less than or equal to the aperture of the second blind hole, and when the first hinge piece and the second hinge piece are assembled together, the conical shaft is inserted into the second blind hole.
6. The oil-free heavy-duty hinge according to claim 5, characterized in that: The fixed shaft section is cylindrical, the diameter of the fixed shaft section is smaller than the diameter of the second blind hole, and when the first hinge piece and the second hinge piece are assembled together, a part of the fixed shaft section is inserted into the second blind hole.
7. The oil-free heavy-duty hinge according to claim 1, characterized in that: The top of the conical head has a radial end surface, the bottom of the conical groove has a groove, and when the first hinge piece and the second hinge piece are assembled together, the radial end surface is embedded in the groove.
8. The oil-free heavy-duty hinge according to any one of claims 1 to 7, characterized in that: The elastic moduli of the conical rotating shaft and the shaft seat are both less than 10 GPa, and the dynamic friction coefficient between the conical rotating shaft and the shaft seat is less than 0.
1.
9. The oil-free heavy-duty hinge according to any one of claims 1 to 7, characterized in that: The first hinge piece is in a sheet shape and has a plurality of first screw holes.
10. The oil-free heavy-duty hinge according to any one of claims 1 to 7, characterized in that: The second hinge piece is in a sheet shape and has a plurality of second screw holes.