A detachable door hinge system and a vehicle-mounted refrigerator using the same

Abstract

The present invention provides a door hinge system that is easy to disassemble and assemble, which includes a box body and a door body. An axle body is provided on the box body, and a bush is provided on the door body. A limiting device is provided on the door body and / or the box body. The bush is made of a material with elastic deformation. The door body and the box body are connected through the axle body and the bush. The limiting device restricts the rotation of the axle body in the bush when the door body is fully opened, and when the door body is fully opened: the distance between two opposite sliding contact surfaces of the bush when elastic deformation occurs under the action of the gravity of the door body itself, the limiting device, the axle body and the bush is less than the diameter of the cylinder where the axle body is located, and the distance between two opposite sliding contact surfaces of the bush when elastic deformation occurs under the action of a force F on the door body, the limiting device, the axle body and the bush can be greater than or equal to the diameter of the cylinder where the axle body is located.

Description

Technical Field

[0001] The present invention relates to an easily disassembled and assembled door shaft system that can be disengaged under force and a vehicle-mounted refrigerator using the same. Background Art

[0002] A storage box body usually uses a door shaft to connect the door body. In order to facilitate the opening of the door body, the holding part for opening the door body is usually located at the distal end of the door body away from the door shaft connection point. In order to facilitate the taking out of the items stored in the box body, the door body usually needs to be opened more than 90 degrees. When the door body continues to receive a force in the opening direction after being opened to the maximum angle, the stress is concentrated in the door shaft area. Repeated opening can easily cause deformation or even damage in the door shaft area. For a vehicle-mounted refrigerator, since it needs to be frequently carried and is limited by the space inside the vehicle, specific requirements need to be met in terms of volume and weight design. Therefore, the material for preparing the vehicle-mounted refrigerator shell cannot be too thick and heavy, and the stress impact that the door shaft area can withstand is limited. Especially when the door body is repeatedly subjected to a large accidental force in the open state, fatigue damage or damage will occur due to stress concentration in the door shaft area, affecting the performance and use of the vehicle-mounted refrigerator. Summary of the Invention

[0003] In view of the above-mentioned defects in the prior art, the present invention proposes the following technical solutions, including the following embodiments:

[0004] Embodiment 1. An easily disassembled and assembled door shaft system, which includes a box body and a door body. An axle body is provided on the box body, and a bushing is provided on the door body. A limiting device is provided on the door body and / or the box body. It is characterized in that the outer surface of the axle body includes an axle body sliding contact surface and an axle body rotating contact surface. Among them, the axle body rotating contact surface coincides with the outer surface of the cylinder where the axle body is located. The axle body sliding contact surface includes two opposite parts on the axle body. The minimum distance (referred to as the minimum parallel tangent distance) between the parallel tangents of the axle body in contact with the axle body sliding contact surface is less than the diameter of the cylinder where the axle body is located. The bushing has an inner opening and a side opening. Two opposite bushing sliding contact surfaces are provided on the side opening for cooperating with the axle body sliding contact surface; an axle sleeve rotating contact surface is provided on the inner opening for cooperating with the axle body rotating contact surface. Thus, the axle body can slide into or out of the bushing through the side opening of the bushing along the direction of the minimum parallel tangent. The axle sleeve rotating contact surface and the axle body rotating contact surface cooperate with each other to realize the rotation of the axle body in the bushing. The bushing is made of a material with elastic deformation. The door body and the box body are connected through the axle body and the bushing. The limiting device restricts the rotation of the axle body in the bushing when the door body is fully opened. And when the door body is fully opened: the distance between the two opposite bushing sliding contact surfaces of the bushing when they elastically deform under the action of the gravity of the door body itself, the limiting device, the axle body and the bushing is less than the diameter of the cylinder where the axle body is located (L0 + LG <d 轴 ) When the distance between two opposite sliding contact surfaces of the bushing undergoes elastic deformation under the interaction of the force F on the door body, the limiting device, the shaft body, and the bushing can be greater than or equal to the diameter of the cylinder where the shaft body is located (L0 + L G+F ≥d 轴 ).

[0005] Embodiment 2. The easily disassembled door hinge system according to Embodiment 1, wherein the material having elastic deformation is selected from polyethylene, polyvinyl chloride, polypropylene, polystyrene, ABS plastic, polycarbonate, nylon, polyurethane, polytetrafluoroethylene, polyethylene terephthalate.

[0006] Embodiment 3. The easily disassembled door hinge system according to Embodiment 1, wherein the force F acts on the distal end of the door body, and its magnitude is 5 - 30 Newtons.

[0007] Embodiment 4. The easily disassembled door hinge system according to Embodiment 1, wherein a groove is provided at the side opening of the bushing to increase the elastic deformation size at the side opening.

[0008] Embodiment 5. The easily disassembled door hinge system according to Embodiment 1, wherein the limiting device is provided on the door body and / or the box body close to the rotation axis of the door body. When the door body is fully opened, the door body and the box body abut against each other through the limiting device. On the rotation plane of the door body opening, the distance from the abutting position of the door body and the box body to the side opening is 1 / 20 to 1 / 5 of the width of the door body.

[0009] Embodiment 6. The easily disassembled door hinge system according to Embodiment 1, wherein the sliding contact surface of the shaft body includes parallel planes, or is mainly composed of one or more groups of parallel planes, and the distance between the parallel planes is between 1 / 3 and 5 / 6 of the diameter of the cylinder where the shaft body is located, preferably between 2 / 5 and 2 / 3.

[0010] Embodiment 7. The easily disassembled door hinge system according to Embodiment 1, wherein the sliding contact surface of the shaft body includes one or two elliptical surfaces, and the minimum parallel tangent distance is between 1 / 3 and 5 / 6 of the diameter of the cylinder where the shaft body is located.

[0011] Embodiment 8. The easily disassembled door hinge system according to Embodiment 1, wherein there are two groups of the sliding contact surfaces of the shaft body, and the included angle between the parallel tangents of the two groups of shaft bodies in contact with the two groups of the sliding contact surfaces of the shaft body is between 30 and 120 degrees, and the difference between the minimum distance between any group of parallel tangents and the distance between the two opposite sliding contact surfaces of the bushing is less than 2 times, 3 times, 4 times, or 5 times of the machining error.

[0012] Embodiment 9. The detachable door hinge system according to Embodiment 1, wherein a flared portion of the sleeve sliding contact surface is provided outside the side opening of the sleeve, and the width of the flared portion is greater than the distance between the two opposite sleeve sliding contact surfaces.

[0013] Embodiment 10. The detachable door hinge system according to Embodiment 1, wherein the area of the shaft body sliding contact surface is less than or equal to the area of the shaft body rotating contact surface.

[0014] Embodiment 11. A vehicle-mounted refrigerator adopting the detachable door hinge system according to any one of Embodiments 1 to 10.

[0015] The technical effects of the present invention include: After the shaft body of the door hinge system slides into the sleeve and rotates a certain angle, a firm connection can be formed. When the shaft body rotates in the opposite direction and slides out of the sleeve, it can be quickly separated, which is very convenient for installation and disassembly. Since the sleeve is made of a material with elastic deformation, when the door is fully opened and continues to be stressed, under the interaction of the limiting device, the shaft body and the sleeve, the side opening of the sleeve is stressed and elastically deformed and expanded, so that the distance between the two opposite sleeve sliding contact surfaces increases, and the shaft body slides out of the sleeve along the expanded side opening. The shaft body can slide out of the sleeve repeatedly. When the door hinge system structure is applied to the connection structure between the storage box body, such as the box body and the door body of a vehicle-mounted refrigerator, the door body can be removed and the storage box body can be fully opened after a small-angle rotation of the door body. When the door body is in the fully opened state and is subjected to a large accidental force, the shaft body slides out of the sleeve, causing the door body and the box body to separate, avoiding excessive stress and damage in the connection area between the door body and the box body. In addition, the technical solution of the present application also brings many other advantages, which will be described in detail in the specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings of the embodiments will be briefly introduced below. Obviously, the drawings described below only relate to some embodiments of the present disclosure and do not limit the present disclosure.

[0017] Figure 1 is a perspective view of the vehicle-mounted refrigerator according to Embodiment 1 of the present application;

[0018] Figure 2 is a schematic diagram of the connection of the vehicle-mounted refrigerator door hinge system;

[0019] Figure 3 is Figure 2 a partial schematic diagram of the door hinge system within the dashed circle in

[0020] Figures 4 to 7 is a schematic diagram of the shaft body and the sleeve according to Embodiment 1;

[0021] Figure 8 and Figure 9 is a schematic diagram of the hinge region with the door body fully opened;

[0022] Figure 10 is a schematic diagram of the elastic deformation at the side opening of the bushing;

[0023] Figure 11 and Figure 12 is a schematic diagram of the hinge region with the door body fully opened in Embodiment 2.

[0024] Reference numerals: 10 - box body, 20 - door body, 30 - limiting device, 100 - shaft body, 110 - sliding contact surface of the shaft body, 120 - rotating contact surface of the shaft body, 200 - bushing, 201 - at the distal edge of the door body, 210 - inner opening, 211 - rotating contact surface of the bushing, 220 - side opening, 221 - sliding contact surface of the bushing, 222 - flared opening, 223 - groove, 301 - the abutting position between the door body and the box body. Detailed implementation manners

[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present disclosure clearer, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present disclosure. Apparently, the described embodiments are some but not all of the embodiments of the present disclosure. All other embodiments obtained by those of ordinary skill in the art based on the described embodiments of the present disclosure without creative efforts shall fall within the scope of protection of the present disclosure.

[0026] The terms in this application have the meanings commonly understood by those skilled in the art, unless otherwise clearly defined or stated to the contrary.

[0027] The present application discloses a detachable door hinge system, which includes a box body and a door body. An axle body is provided on the box body, and a bushing is provided on the door body. A limiting device is provided on the door body and / or the box body. It is characterized in that the outer surface of the axle body includes an axle body sliding contact surface and an axle body rotating contact surface. Among them, the axle body rotating contact surface coincides with the outer surface of the cylinder where the axle body is located. The axle body sliding contact surface includes two opposite parts on the axle body. The minimum distance (referred to as the minimum parallel tangent distance) between the parallel tangents of the axle body in contact with the axle body sliding contact surface is less than the diameter of the cylinder where the axle body is located. The bushing has an inner opening and a side opening. There are two opposite bushing sliding contact surfaces on the side opening for cooperating with the axle body sliding contact surface; there is a bushing rotating contact surface on the inner opening for cooperating with the axle body rotating contact surface. Thus, the axle body can slide into or out of the bushing through the side opening of the bushing along the direction of the minimum parallel tangent. The bushing rotating contact surface and the axle body rotating contact surface cooperate with each other to realize the rotation of the axle body in the bushing. The bushing is made of a material with elastic deformation. The door body and the box body are connected through the axle body and the bushing. The limiting device restricts the rotation of the axle body in the bushing when the door body is fully opened. And when the door body is fully opened: the distance between the two opposite bushing sliding contact surfaces of the bushing when they undergo elastic deformation under the action of the gravity of the door body itself, the limiting device, the axle body and the bushing is less than the diameter of the cylinder where the axle body is located (L0 + L G <d 轴 ), and the distance between the two opposite bushing sliding contact surfaces of the bushing when they undergo elastic deformation under the action of the force F on the door body, the limiting device, the axle body and the bushing can be greater than or equal to the diameter of the cylinder where the axle body is located (L0 + L G+F ≥d 轴 ).

[0028] The cylinder where the shaft body described in the present application is a virtual cylinder, and the shaft body rotation contact surface coincides with at least part of the cylindrical surface of the virtual cylinder. The parallel tangents of the shaft body described in the present application refer to two parallel lines that are perpendicular to the extension direction of the shaft body (i.e. the direction of the rotation axis when the door axis system rotates) and are respectively in contact with two opposite shaft body sliding contact surfaces on the shaft body, and do not enter the shaft body. Among all the parallel tangents, the parallel tangent with the smallest distance between the two parallel lines is called the minimum parallel tangent, and this distance is the minimum parallel tangent distance. The present application defines the minimum parallel tangent distance of the shaft body as being less than the diameter of the cylinder where the shaft body is located, that is, at least one of the two parallel lines is in contact with the shaft body sliding contact surface inside the cylinder where the shaft body is located. When only one of the two parallel lines is in contact with the shaft body sliding contact surface inside the cylinder where the shaft body is located, the shaft body sliding contact surface corresponding to the other line coincides with a part of the shaft body rotation contact surface, that is, the other line is in contact with the outer surface of the cylinder where the shaft body is located.

[0029] In the present application, in order to form a matching relationship between the sliding contact surface of the sleeve and the sliding contact surface of the shaft body, and a matching relationship between the rotating contact surface of the sleeve and the rotating contact surface of the shaft body, the opening size of the side opening depends on the minimum parallel tangent distance, and the size of the inner opening depends on the diameter of the cylinder where the shaft body is located. The present application stipulates that the minimum parallel tangent distance of the shaft body is smaller than the diameter of the cylinder where the shaft body is located, that is, the opening size of the side opening is smaller than the size of the inner opening, so that the shaft body cannot escape after entering the sleeve and rotating a certain angle, thereby forming a stable connection. Only by rotating the shaft body sleeve back to the position relationship at the moment when the shaft body enters the sleeve can the two be separated, thereby realizing the disassembly and installation of the door shaft system, and achieving the effect of "easy disassembly and assembly". In the present application, the opening size of the side opening refers to the distance between the two relative sleeve sliding contact surfaces on the side opening when the sleeve has not undergone elastic deformation, and the size of the inner opening refers to the diameter of a virtual cylinder that at least partially overlaps with the arc of the sleeve rotating contact surface on the inner opening.

[0030] In this application, elastic deformation (also called elastic deformation) refers to the deformation of a material under the action of an external force. When the external force is removed, the deformation of the material disappears and completely returns to its original shape. The important feature of elastic deformation is its reversibility. The sleeve described in this application is made of a material with elastic deformation, so that the side opening expands due to elastic deformation when subjected to force, and the distance between the two relative sleeve sliding contact surfaces increases. When the external force is removed, the elastic deformation of the side opening disappears.

[0031] The door body and the box body are connected by the shaft body and the sleeve. The limit device limits the rotation of the shaft body in the sleeve when the door body is fully opened. At this time, if the door body continues to be subjected to a force along the opening direction, the force of the door body is transmitted to the sleeve, and the side opening undergoes elastic deformation.

[0032] When the door body is fully opened, the elastic deformation of the side opening satisfies: L0 + L G <d 轴 , at this time, the shaft body cannot be disengaged from the shaft sleeve.

[0033] When the door body is fully opened and the door body is subjected to a force F, the elastic deformation of the side opening can satisfy: L0 + L G+F ≥d 轴 , at this time, the shaft body disengages from the shaft sleeve, and after disengagement, the elastic deformation of the side opening disappears, and the distance between the two opposite sliding contact surfaces of the shaft sleeves on the side opening returns to L0.

[0034] Among them, L0 refers to the opening size of the side opening; L G refers to the elastic deformation size of the side opening under the action of the self - weight G of the door body when the door body is fully opened; L G+F refers to the elastic deformation size of the side opening under the combined action of the self - weight G of the door body and the external force F when the door body is fully opened; d 轴 refers to the diameter of the cylinder where the shaft body is located. The elastic deformation size described in this application refers to the increased distance due to elastic deformation between the two opposite sliding contact surfaces of the shaft sleeves on the side opening when the side opening is elastically deformed under force.

[0035] That is, when the door body is subjected to an external force, it can disengage within the elastic deformation range of the shaft sleeve, achieving the effect of "disengaging under force", avoiding irreversible deformation or damage to the shaft sleeve and the adjacent door shaft area due to excessive force. Due to the reversibility of elastic deformation, this disengagement can be carried out repeatedly. After the door body disengages, the shaft body can slide into the shaft sleeve along the direction of the minimum parallel tangent through the side opening of the shaft sleeve and form a stable connection.

[0036] The limit device described in this application only needs to satisfy restricting the rotation of the shaft body in the shaft sleeve when the door body is fully opened. It can be set on the door body, or on the box body, or on both the door body and the box body at the same time, or it can be the area where the door body and the box body are in contact with each other at the door shaft when the door body is fully opened. Those skilled in the art can reasonably select and set it.

[0037] The "disengagement" or "disengaging under force" described in this application refers to the process in which the shaft body disengages from the shaft sleeve through the expanded side opening of the shaft sleeve within the elastic deformation range of the shaft sleeve. "Sliding into" or "entering", "sliding out" refers to the process in which the shaft body and the shaft sleeve are connected and separated along the sliding contact surface of the shaft sleeve.

[0038] In this application, the shaft body in the hinge system is made of metal such as copper, iron or alloy. There is no limitation on the specific selection of the metal, as long as it can meet the requirements of specific application scenarios. Those skilled in the art can make appropriate selections according to actual needs.

[0039] In some embodiments, the material with elastic deformation is selected from polyethylene, polyvinyl chloride, polypropylene, polystyrene, ABS plastic, polycarbonate, nylon, polyurethane, polytetrafluoroethylene, polyethylene terephthalate. In addition to having enough elastic deformation size to allow the shaft body to escape from the side opening within the elastic deformation range of the bushing, the selection of the bushing material also needs to consider the ease of generating elastic deformation of the material, that is, the stress required for the material to generate unit elastic deformation under the action of external force. In engineering applications, the elastic modulus can be used to measure the ease of generating elastic deformation of the material. If the elastic modulus of the material is too large, too much external force is required for the bushing to escape, and it is difficult to avoid damage to the connection area between the door body and the box body due to excessive force. If the elastic modulus of the material is too small, the connection between the shaft body and the bushing is not stable enough, and the bushing may escape due to external force even when the door body is not fully opened, thus affecting the use. The material described in this application can not only form a sufficiently stable connection after the shaft body slides into the bushing and rotates a certain angle, but also enable the shaft body to escape from the side opening within the elastic deformation range of the bushing under the interaction of the limiting device, the shaft body and the bushing when the door body is subjected to a large external force. Those skilled in the art can select materials with similar properties to these materials.

[0040] In some embodiments, the force F acts on the distal end of the door body, and its magnitude is 5 - 30 Newtons. Such a setting enables the door body to escape under an appropriate acting force, facilitating the user to easily remove the door body without the aid of other tools. The distal end of the door body refers to the distal end relative to the rotation axis of the door body, that is, the area of the door body far from the rotation axis. In the plane of rotation of the door body, the distal end of the door body has a larger force arm relative to the proximal end of the door body. The force F acting on the distal end of the door body can cause elastic deformation at the side opening of the bushing and enable the door body to escape under the interaction of the limiting device, the shaft body and the bushing.

[0041] In some embodiments, a groove is provided at the side opening of the bushing, so as to increase the elastic deformation size at the side opening. Providing the groove not only reduces the stress required for the bushing to generate unit elastic deformation at the side opening, but also increases the displacement at the side opening of the bushing within the same elastic deformation range, that is, increases the distance between the two relatively sliding contact surfaces of the bushing, thereby increasing the elastic deformation ability of the bushing and facilitating the use of materials with poor elastic deformation.

[0042] In some embodiments, the limiting device is provided on the door body and / or the box body close to the rotation axis of the door body. When the door body is fully opened, the door body and the box body abut against each other through the limiting device. On the rotation plane of the door body during opening, the distance from the abutting position between the door body and the box body to the side opening is 1 / 20 to 1 / 5 of the width of the door body. The width of the door body refers to the dimension from the distal edge of the door body to the side opening. Since the limiting device is close to the rotation axis of the door body, the width of the door body is approximately equal to the distance from the distal edge of the door body to the abutting position between the door body and the box body. When the door body is fully opened, a lever is formed with the abutting position between the door body and the box body as the fulcrum between the side opening and the force application point of the force F on the door body. During the process of the door body continuing to be subjected to a force (power) along the opening direction and causing the shaft body to disengage from the shaft sleeve, the distance from the force application point on the door body to the abutting position between the door body and the box body is the power arm. When the force (power) along the opening direction acts on the distal edge of the door body, the width of the door body is the power arm of the lever, and the distance from the abutting position between the door body and the box body to the side opening is the resistance arm of the lever. The resistance acts on the side opening of the shaft sleeve and causes elastic deformation and expansion of the side opening, increasing the distance between the two opposite shaft sliding contact surfaces of the shaft sleeve and causing the shaft body to disengage from the shaft sleeve. Since the width of the door body is much larger than the distance from the abutting position between the door body and the box body to the side opening, a relatively small force acting on the distal end of the door body can, through the lever effect, cause elastic deformation at the side opening of the shaft sleeve until the shaft body disengages.

[0043] In some embodiments, the shaft sliding contact surface includes parallel planes, or is mainly composed of one or more groups of parallel planes. The distance between the parallel planes is between 1 / 3 and 5 / 6 of the diameter of the cylinder where the shaft body is located, preferably between 2 / 5 and 2 / 3. The shaft sliding contact surface including planes can produce a smooth feel, especially when there are parallel planes, which can improve comfort.

[0044] In some embodiments, the shaft sliding contact surface includes one or two elliptical surfaces, where the minimum parallel tangent distance is between 1 / 3 and 5 / 6 of the diameter of the cylinder where the shaft body is located. The elliptical surface means that the cross-section of any shaft sliding contact surface coincides with a part of an elliptical curve. This elliptical surface makes the sliding contact surface have a narrower end, that is, the position closer to the rotation contact surface of the shaft body is narrower, so that the shaft body can more conveniently slide into the shaft sleeve from the narrow end.

[0045] In some embodiments, there are two sets of sliding contact surfaces of the shaft bodies in the easily disassembled and assembled hinge system. The angle between the parallel tangents of the two sets of shaft bodies in contact with the two sets of sliding contact surfaces of the shaft bodies is between 30 and 120 degrees, and the difference between the minimum distance between any set of parallel tangents and the distance between the two opposite sliding contact surfaces of the shaft sleeves is less than 2 times, 3 times, 4 times, or 5 times the machining error. At least one of the two parallel lines in any set of parallel tangents of the two sets of shaft bodies contacts the sliding contact surface of the shaft body inside the cylinder where the shaft body is located. The minimum parallel tangent distance of any set of shaft bodies is less than the diameter of the cylinder where the shaft body is located. Thus, the shaft body can slide into or out of the shaft sleeve through the side opening of the shaft sleeve along the direction of any set of the minimum parallel tangents, that is, the disassembly and assembly of the hinge system can be achieved from two different angles. The distance between the two opposite sliding contact surfaces of the shaft sleeves is the minimum size of the side opening of the shaft sleeve, and the minimum distance between any set of parallel tangents (i.e., the minimum parallel tangent distance) is the maximum size of the shaft body in the sliding direction. The difference between the two is less than 2 times, 3 times, 4 times, or 5 times the machining error, enabling a closer fit between the shaft body and the shaft sleeve when the shaft body slides into the shaft sleeve through the side opening.

[0046] In some embodiments, there is a flared opening for the sliding contact surface of the shaft sleeve outside the side opening of the shaft sleeve. The width of the flared opening is greater than the distance between the two opposite sliding contact surfaces of the shaft sleeves. Thus, the shaft body can be guided to slide into the side opening through the flared opening, making the installation more convenient.

[0047] In some embodiments, the area of the sliding contact surface of the shaft body is less than or equal to the area of the rotating contact surface of the shaft body. A larger rotating contact area of the shaft body can provide relatively stable rotating performance.

[0048] The present application also discloses a vehicle-mounted refrigerator adopting the easily disassembled and assembled hinge system described in any one of the foregoing. After rotating the door body in the closed state by a certain angle in the vehicle-mounted refrigerator, the door body can be disassembled by sliding the shaft body out of the shaft sleeve, which is convenient for taking items from the vehicle-mounted refrigerator. In the state where the door body is fully opened, by applying an external force to the door body, the shaft body can be disengaged from the shaft sleeve through the elastic deformation and expansion of the shaft sleeve to achieve rapid disassembly of the door body. Especially when the door body is accidentally stressed in the fully opened state, the shaft body disengaging from the shaft sleeve separates the door body from the box body, avoiding excessive stress on the connection area between the door body and the box body and extending the service life of the vehicle-mounted refrigerator.

[0049] The scopes described above can be used alone or in combination. Through the following embodiments, it is easier to understand the present application.

[0050] Embodiment

[0051] Embodiment 1

[0052] Reference Figures 1 to 3 , this embodiment discloses a vehicle-mounted refrigerator connected by a detachable hinge system, which includes a box body 10, a door body 20 and a limiting device 30. Two shafts 100 are provided on the box body 10, and two bushings 200 are provided on the door body 20. The limiting device 30 is a protrusion provided near the bushing 200 on the door body 20. The box body 10 and the door body 20 are connected by two sets of the shafts 100 and bushings 200 arranged oppositely (as shown in Figure 1 ), and the limiting device 30 can abut against the upper edge of the box body 10 when the door body 20 is fully opened, so as to limit the rotation of the shaft 100 in the bushing 200.

[0053] Reference Figure 4 and Figure 5 , the outer surface of the shaft 100 includes a shaft sliding contact surface 110 and a shaft rotation contact surface 120. Among them, the shaft rotation contact surface 120 coincides with the outer surface of the cylinder where the shaft is located (the dotted line in Figure 5 shows the cross-section of the virtual cylinder). The diameter of the cylinder where the shaft is located is 1.2 cm. The shaft sliding contact surface 110 includes two opposite parallel planes on the shaft 100. The minimum distance between the parallel tangents of the shaft in contact with the two shaft sliding contact surfaces 110 is 0.9 cm (referred to as the minimum parallel tangent distance, Figure 5 shows the parallel tangents of the shaft), and the minimum parallel tangent distance is less than the diameter of the cylinder where the shaft is located.

[0054] The bushing 200 has an inner opening 210 and a side opening 220. The side opening 220 has two opposite shaft sleeve sliding contact surfaces 221 for cooperating with the shaft sliding contact 110. The inner opening 210 has a shaft sleeve rotation contact surface 211 for cooperating with the shaft rotation contact surface 120. Thus, the shaft 100 can slide into or out of the bushing 200 along the direction of the minimum parallel tangent through the side opening 220 of the bushing 200. The shaft sleeve rotation contact surface 211 and the shaft rotation contact surface 120 cooperate with each other to realize the rotation of the shaft 100 in the bushing 200. The outside of the side opening 220 of the bushing has a shaft sleeve sliding contact surface flare 222. The width of the flare 222 is greater than the distance between the two opposite shaft sleeve sliding contact surfaces 221. The maximum width of the flare 222 is 1.5 cm, so that the shaft 100 can be guided into the side opening 220 through the flare 222, which is more convenient for installation. The difference between the opening size of the side opening and the minimum parallel tangent distance is less than 2 times the machining error, that is, the opening size of the side opening is slightly greater than 0.9 cm, so as to achieve a tight fit between the shaft and the bushing.

[0055] The bushing 200 is made of an elastic deformation material, ABS plastic, so that when the side opening is stressed, it expands due to elastic deformation, and the distance between the sliding contact surfaces of the two opposite bushings increases. When the external force is removed, the elastic deformation of the side opening disappears.

[0056] Referring to Figure 6 and Figure 7 , after the shaft body 100 slides into the bushing 200 and rotates a certain angle, a firm connection is formed ( Figure 7 The process of the shaft body sliding into the bushing from the side opening and the bushing rotating to form a firm connection is shown successively from left to right). Only by rotating the shaft body and the bushing back to the position relationship at the moment when the shaft body enters the bushing can the two be separated, thus realizing the quick disassembly and assembly of the door hinge system. The vehicle-mounted refrigerator using this door hinge system can achieve the quick disassembly and assembly of the door body. When the door body 20 is opened, the bushing 200 rotates around the shaft body 100. When it rotates to a specific angle, the shaft body 100 slides out, and the entire door body 20 can be removed, which is convenient for taking out the items in the box, or the door body 20 can be quickly installed and form a firm connection.

[0057] Referring to Figure 8 , when the door body is fully opened, the door body 20 abuts against the abutting position 301 between the door body and the box body located on the upper edge of the box body 10 through the limiting device 30, thereby restricting the rotation of the shaft body 100 in the bushing 200. At this time, the bushing 200 undergoes elastic deformation under the action of the gravity of the door body itself, the limiting device, and the interaction between the shaft body and the bushing. The elastic deformation of the side opening satisfies: L0 + L G <d 轴 , where L0 is the opening size of the side opening, 0.9 cm, and d 轴 is the diameter of the cylinder where the shaft body is located, 1.2 cm, and L G is the elastic deformation size of the side opening under the action of the self-gravity G of the door body. At this time, the shaft body cannot escape from the bushing.

[0058] Referring to Figure 9 and Figure 10 , when the door body is fully opened, the distance from the distal edge of the door body to the abutting position 301 between the door body and the box body is 40 cm (i.e., the width of the door body, not shown in the figure). The distance from the abutting position 301 between the door body and the box body to the side opening ( Figure 9 the distance a shown by the dotted line in Figure 10 (a)) is about 1 / 15 of the width of the door body. At this time, if a force F of 30 N is applied to the distal edge of the door body along the door body opening direction, a lever with the abutting position 301 between the door body and the box body as the fulcrum is formed between the side opening and the force application point of the door body under the force F. The force F acts on the side opening of the bushing through the lever and causes the side opening to expand elastically, as G+F ≥d轴 , where L G+F refers to the elastic deformation dimension of the side opening under the combined action of the self - gravity G of the door body and the external force F when the door body is fully opened, that is, L G+F ≥0.3 cm. At this time, the door body can be disengaged within the range of the elastic deformation of the bushing, achieving the effect of "disengaging under force", so that the door body falls off the box body. While facilitating disassembly, it avoids irreversible deformation or damage to the bushing and the adjacent door shaft area due to excessive force. Due to the reversibility of elastic deformation, this disengagement can be carried out repeatedly. After the door body falls off, as Figure 10 (b) shows, the elastic deformation of the side opening disappears, the opening dimension of the side opening returns to 0.9 cm, and the shaft body can slide into the bushing along the direction of the minimum parallel tangent via the side opening of the bushing and form a stable connection.

[0059] Embodiment 2

[0060] Referring to Figure 11 and Figure 12 , this embodiment discloses a vehicle - mounted refrigerator connected by an easily detachable door shaft system, which includes a box body 10, a door body 20 and a limiting device 30, and its setting is the same as that in Embodiment 1. A plurality of grooves 223 are provided at the side opening of the bushing 200. The provision of the grooves not only reduces the stress required for unit elastic deformation at the side opening of the bushing, but also increases the displacement at the side opening of the bushing within the same elastic deformation range, that is, increases the distance between the two relatively sliding contact surfaces of the bushing, so that the elastic deformation dimension at the side opening increases, thereby increasing the elastic deformation ability of the bushing.

[0061] When the door body is fully opened, the door body 20 abuts against the abutting portion 301 between the door body and the box body located at the upper edge of the box body 10 through the limiting device 30, thereby restricting the rotation of the shaft body 100 within the bushing 200. At this time, the bushing 200 undergoes elastic deformation under the action of the self - gravity of the door body, the limiting device, and the interaction between the shaft body and the bushing. The elastic deformation of the side opening satisfies: L0 + L G <d 轴 , where L0 is the opening dimension 0.9 cm of the side opening, d 轴 is the diameter 1.2 cm of the cylinder where the shaft body is located, and L G is the elastic deformation dimension of the side opening under the action of the self - gravity G of the door body. At this time, the shaft body cannot be disengaged from the bushing.

[0062] Referring to Figure 11 , when the door body is fully opened, the distance from the distal edge 201 of the door body to the abutting portion 301 between the door body and the box body is 40 cm (i.e., the width of the door body), and the distance from the abutting portion 301 between the door body and the box body to the side opening (refer to Embodiment 1 Figure 9The distance a) shown by the dashed line in the figure is approximately 1 / 15 of the width of the door body. At this time, if a force F of 10 N is applied at the distal edge 201 of the door body along the door body opening direction, a lever with the point of contact 301 where the door body and the box body abut against each other as the fulcrum is formed between the side opening and the point of application of the force F on the door body (i.e., the distal edge 201 of the door body). The force F acts on the side opening of the bushing through the lever, causing the side opening to undergo elastic deformation and expansion. The elastic deformation of the side opening can satisfy: L0 + L G+F ≥d 轴 , where L G+F refers to the elastic deformation size of the side opening under the combined action of the self - weight G of the door body and the external force F when the door body is fully opened, that is, L G+F ≥0.3 cm. At this time, the door body can be disengaged within the elastic deformation range of the bushing, achieving the effect of "disengaging under force", so that the door body falls off the box body. While facilitating disassembly, it avoids irreversible deformation or damage to the bushing and the adjacent door shaft area due to excessive force. Due to the reversibility of elastic deformation, this disengagement can be repeated. After the door body falls off, the elastic deformation of the side opening disappears, and the opening size of the side opening returns to 0.9 cm. The shaft body can then slide into the bushing along the direction of the minimum parallel tangent through the side opening of the bushing and form a stable connection.

[0063] The above is only an exemplary embodiment of the present disclosure and is not used to limit the protection scope of the present disclosure. The protection scope of the present disclosure is determined by the appended claims.

Claims

1. An easily disassembled and assembled door hinge system, which comprises a box body and a door body. An axle body is arranged on the box body, and a bush is arranged on the door body. A limiting device is arranged on the door body and / or the box body. It is characterized in that, The outer surface of the axle body includes an axle body sliding contact surface and an axle body rotating contact surface. Among them, the axle body rotating contact surface coincides with the outer surface of the cylinder where the axle body is located. The axle body sliding contact surface includes two opposite parts on the axle body. The minimum distance between the parallel tangents of the axle body in contact with the axle body sliding contact surface, that is, the minimum parallel tangent distance, is less than the diameter of the cylinder where the axle body is located. The bush has an inner opening and a side opening. There are two opposite bush sliding contact surfaces on the side opening for cooperating with the axle body sliding contact surface; there is a bush rotating contact surface on the inner opening for cooperating with the axle body rotating contact surface. Thus, the axle body can slide into or out of the bush through the side opening of the bush along the direction of the minimum parallel tangent. The bush rotating contact surface and the axle body rotating contact surface cooperate with each other to realize the rotation of the axle body in the bush. The bush is made of a material with elastic deformation. The door body and the box body are connected through the axle body and the bush. The limiting device restricts the rotation of the axle body in the bush when the door body is fully opened. And when the door body is fully opened: The distance between the two opposite bush sliding contact surfaces of the bush when they undergo elastic deformation under the action of the gravity of the door body itself, the limiting device, and the interaction between the axle body and the bush is less than the diameter of the cylinder where the axle body is located. The distance between the two opposite bush sliding contact surfaces of the bush when they undergo elastic deformation under the action of the force F on the door body, the limiting device, and the interaction between the axle body and the bush can be greater than or equal to the diameter of the cylinder where the axle body is located.

2. The detachable door hinge system according to claim 1, characterized in that The material with elastic deformation is selected from polyethylene, polyvinyl chloride, polypropylene, polystyrene, ABS plastic, polycarbonate, nylon, polyurethane, polytetrafluoroethylene, polyethylene terephthalate.

3. The detachable door hinge system according to claim 1, wherein The force F acting on the door body acts on the distal end of the door body, and its magnitude is 5 - 30 Newtons.

4. The detachable door hinge system according to claim 1, wherein A groove is opened at the side opening of the bush to increase the elastic deformation size at the side opening.

5. The detachable door hinge system according to claim 1, characterized in that, The limiting device is arranged on the door body and / or the box body near the rotation axis of the door body. When the door body is fully opened, the door body and the box body are abutted against each other through the limiting device. On the rotation plane of the door body when it is opened, the distance from the abutting position of the door body and the box body to the side opening is 1 / 20 to 1 / 5 of the width of the door body.

6. The detachable door hinge system according to claim 1, characterized in that, The axle body sliding contact surface includes parallel planes, or is composed of one group or multiple groups of parallel planes. The distance between the parallel planes is between 1 / 3 and 5 / 6 of the diameter of the cylinder where the axle body is located, or between 2 / 5 and 2 / 3.

7. The detachable door hinge system according to claim 1, wherein, The axle body sliding contact surface includes one or two elliptical surfaces, and the minimum parallel tangent distance is between 1 / 3 and 5 / 6 of the diameter of the cylinder where the axle body is located.

8. The detachable door hinge system according to claim 1, wherein There are two sets of the sliding contact surfaces of the shaft bodies, and the angle between the parallel tangents of the two sets of the shaft bodies in contact with the two sets of the sliding contact surfaces of the shaft bodies is between 30 and 120 degrees, and the difference between the minimum distance between any set of the parallel tangents and the distance between the two opposite sliding contact surfaces of the shaft sleeves is less than 2 times, 3 times, 4 times, or 5 times of the machining error.

9. The detachable door hinge system according to claim 1, wherein, On the outside of the side opening of the shaft sleeve, there is a flaring of the sliding contact surface of the shaft sleeve, and the width of the flaring is greater than the distance between the two opposite sliding contact surfaces of the shaft sleeve.

10. A vehicle-mounted refrigerator adopting the easily disassembled and assembled door hinge system according to any one of claims 1 to 9.

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