An easily detachable door shaft system and a vehicle-mounted refrigerator using the same

Abstract

The present invention provides an easily detachable door axis system, which includes a shaft body and a shaft sleeve, and is characterized in that the outer surface of the shaft body includes a shaft body sliding contact surface and a shaft body rotating contact surface, wherein the shaft body rotating contact surface coincides with the outer surface of the cylinder where the shaft body is located, and the shaft body sliding contact surface includes two opposite parts on the shaft body, and the minimum distance between the parallel tangents of the shaft body in contact with the shaft body sliding contact surface (called the minimum parallel tangent distance) is smaller than the diameter of the cylinder where the shaft body is located, so that the shaft body can enter or exit the sleeve through the side opening of the sleeve along the direction of the minimum parallel tangent, and the sleeve rotating contact surface and the shaft body rotating contact surface cooperate with each other to realize the rotation of the shaft body in the sleeve.

Description

Technical Field

[0001] The invention relates to an easily detachable door shaft system and a vehicle-mounted refrigerator using the same. Background Art

[0002] When opening a storage box connected by a door hinge, the door needs to be rotated a large angle along the door hinge to facilitate the removal of items inside the box, which brings inconvenience to the installation and use of the box in a limited space. For example, when designing a common car refrigerator, it is necessary to consider leaving enough space in the car for the box to be opened, thereby limiting the effective volume of the car refrigerator. Moreover, since the opened door is fixed to the box, the path for removing items from the side of the door is blocked. After opening the box, items can usually only be removed from one side (for example, from the front seat), which brings inconvenience to the use of the car refrigerator. Summary of the Invention

[0003] The present invention addresses the above-mentioned defects in the prior art and proposes the following technical solutions, including the following implementation methods:

[0004] Implementation 1. An easily detachable door axis system, which includes a shaft body and a shaft sleeve, characterized in that the outer surface of the shaft body includes a shaft body sliding contact surface and a shaft body rotating contact surface, wherein the shaft body rotating contact surface coincides with the outer surface of the cylinder where the shaft body is located, and the shaft body sliding contact surface includes two opposite parts on the shaft body, and the minimum distance between the parallel tangents of the shaft body in contact with the shaft body sliding contact surface (called the minimum parallel tangent distance) is less than the diameter of the cylinder where the shaft body is located, and the sleeve has an inner opening and a side opening, and the side opening has two opposite sleeve sliding contact surfaces for cooperating with the shaft body sliding contact surface; the inner opening has a sleeve rotating contact surface for cooperating with the shaft body rotating contact surface, so that the shaft body can enter or exit the sleeve through the side opening of the sleeve along the direction of the minimum parallel tangent, and the sleeve rotating contact surface and the shaft body rotating contact surface cooperate with each other to realize the rotation of the shaft body in the sleeve.

[0005] Embodiment 2. An easily detachable door axis system according to embodiment 1, wherein the sliding contact surface of the axis body includes a plane; the sliding contact surface of the axis 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 axis body is located, preferably between 2 / 5 and 2 / 3.

[0006] Embodiment 3. According to the easily detachable door axis system described in embodiment 1, the sliding contact surface of the axis body includes one or two elliptical surfaces, wherein the minimum parallel tangent distance is between 1 / 3 and 5 / 6 of the diameter of the cylinder where the axis body is located.

[0007] Embodiment 4. According to the easily detachable door hinge system of embodiment 1, the sliding contact surface of the shaft body has a first shaft body limiting portion (protrusion or depression) arranged along the sliding direction, and the sliding contact surface of the sleeve has a first sleeve limiting portion arranged along the sliding direction, wherein the first sleeve limiting portion and the first shaft body limiting portion match each other in shape;

[0008] The shaft body rotation contact surface has a second shaft body limiting portion (protrusion or depression) arranged along the rotation direction, and the sleeve rotation contact surface has a second sleeve limiting portion arranged along the rotation direction, wherein the second sleeve limiting portion and the second shaft body limiting portion match each other in shape.

[0009] Embodiment 5. According to the easily detachable door shaft system described in embodiment 1, the difference between the distance between the two relative sleeve sliding contact surfaces and the minimum parallel tangent distance is less than 2 times, 3 times, 4 times, or 5 times the processing error.

[0010] Embodiment 6. According to the easily detachable door axis system described in Embodiment 1, there are two groups of sliding contact surfaces of the axis body, and the angle between the two groups of parallel tangents of the axis body in contact with the two groups of sliding contact surfaces of the axis 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 sleeve sliding contact surfaces is less than 2 times, 3 times, 4 times, or 5 times the processing error.

[0011] Embodiment 7. According to the easily detachable door shaft system described in embodiment 1, the outer side of the side opening of the sleeve has a sleeve sliding contact surface expansion, and the width of the expansion is greater than the distance between the two opposing sleeve sliding contact surfaces.

[0012] Embodiment 8. According to the easily detachable door hinge system of embodiment 1, the area of the sliding contact surface of the hinge body is less than or equal to the area of the rotating contact surface of the hinge body.

[0013] Embodiment 9. A box, such as a car refrigerator, has a trough body and a cover body, and the trough body and the cover body are connected by the easily detachable door axis system described in any one of Embodiments 1-7.

[0014] Embodiment 10. The housing according to embodiment 9, wherein the shaft body is connected to the groove body, and the shaft sleeve is connected to the cover body.

[0015] Embodiment 11. The housing according to embodiment 10, wherein the shaft body is connected to the groove body in a rotatably fixed manner.

[0016] Embodiment 12. A box according to embodiment 11, wherein an indicator for displaying the direction of the minimum parallel tangent of the shaft is provided on the outside of the box, and optionally, the indicator is fixedly connected to the shaft so that when the shaft rotates, the indicator automatically indicates a new angle.

[0017] The technical effect of this invention is that after the shaft enters the sleeve, it can be rotated a certain angle to form a stable connection. After rotating the shaft the opposite angle, it can be quickly separated from the sleeve, making it very easy to install and disassemble. When this structure is applied to the connection between the tank and lid of a storage box, such as a car refrigerator, the lid can be removed by a small rotation of the lid, fully opening the storage box and facilitating access from multiple angles. In addition, the technical solution of this application also brings many other advantages, which will be explained in detail in the specific implementation method. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] 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 in the following description only relate to some embodiments of the present disclosure, rather than limiting the present disclosure.

[0019] Figures 1 to 3 is a schematic diagram of the door hinge system described in Example 1 of the present application;

[0020] Figures 4 to 6 is a schematic diagram of the vehicle refrigerator described in Example 2 of the present application;

[0021] Figures 7 and 8 This is a schematic diagram of the door hinge system described in Example 3 of the present application;

[0022] Figures 9 and 10 This is a schematic diagram of the door hinge system described in Example 4 of the present application;

[0023] Figures 11 to 14 This is a schematic diagram of the door hinge system described in Example 5 of the present application;

[0024] Figures 15 to 18 This is a schematic diagram of the door hinge system described in Example 6 of the present application.

[0025] Figure markings: 100 - shaft body, 110 - shaft body sliding contact surface, 120 - shaft body rotating contact surface, 200 - shaft sleeve, 210 - inner opening, 211 - shaft sleeve rotating contact surface, 220 - side opening, 221 - shaft sleeve sliding contact surface, 222 - expansion, 300 - groove body, 400 - cover body. DETAILED DESCRIPTION

[0026] To make the purpose, technical solutions, and advantages of the embodiments of the present disclosure more clear, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0027] The terms in this application have the meanings that are commonly understood by those skilled in the art, unless otherwise explicitly defined or explained to the contrary.

[0028] The present application discloses an easily detachable door axis system, which includes a shaft body and a shaft sleeve, and is characterized in that the outer surface of the shaft body includes a shaft body sliding contact surface and a shaft body rotating contact surface, wherein the shaft body rotating contact surface coincides with the outer surface of the cylinder where the shaft body is located, and the shaft body sliding contact surface includes two opposite parts on the shaft body, and the maximum distance between the parallel tangents of the shaft body in contact with the shaft body sliding contact surface (called the minimum parallel tangent distance) is less than the diameter of the cylinder where the shaft body is located, and the sleeve has an inner opening and a side opening, and the side opening has two opposite sleeve sliding contact surfaces for cooperating with the shaft body sliding contact surface; the inner opening has a sleeve rotating contact surface for cooperating with the shaft body rotating contact surface, so that the shaft body can enter or exit the sleeve through the side opening of the sleeve along the direction of the minimum parallel tangent, and the sleeve rotating contact surface and the shaft body rotating contact surface cooperate with each other to realize the rotation of the shaft body in the sleeve.

[0029] The cylinder where the shaft body described in the present application is located 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 (that is, the direction of the rotation axis when the door axis system rotates) and are in contact with two opposite shaft body sliding contact surfaces on the shaft body respectively, 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.

[0030] 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, as well as 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 less than the diameter of the cylinder where the shaft body is located, that is, the size of the side opening is less 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 and sleeve back to the position relationship at the moment when the shaft body enters the sleeve can the two be separated. In the present application, the size of the side opening refers to the distance between the two opposing sleeve sliding contact surfaces on the side opening, 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.

[0031] In the present application, the shaft in the door shaft system is made of metal such as copper, iron or alloy. The specific choice of the metal is not limited, as long as it can meet the needs of the specific application scenario, and those skilled in the art can make an appropriate choice according to actual needs.

[0032] In some embodiments, the shaft sliding contact surface comprises a flat surface; the shaft sliding contact surface comprises parallel flat surfaces, or is primarily composed of one or more sets of parallel flat surfaces, wherein the distance between the parallel flat surfaces is between 1 / 3 and 5 / 6, preferably between 2 / 5 and 2 / 3, of the diameter of the cylinder in which the shaft is located. A shaft sliding contact surface comprising flat surfaces can produce a smooth feel, and particularly when comprising parallel flat surfaces, can enhance comfort.

[0033] In some embodiments, the shaft sliding contact surface includes one or two elliptical surfaces, wherein the minimum parallel tangent distance is between 1 / 3 and 5 / 6 of the diameter of the cylinder in which the shaft is located. An elliptical surface refers to a cross-section of any shaft sliding contact surface that coincides with a portion of an elliptical curve. This elliptical surface results in a narrower end portion of the sliding contact surface, i.e., a narrower portion near the shaft rotating contact surface, thereby facilitating the shaft to enter the sleeve from the narrow end portion.

[0034] In some embodiments, the shaft sliding contact surface has a first shaft limiting portion (protrusion or depression) arranged along the sliding direction, and the sleeve sliding contact surface has a first sleeve limiting portion arranged along the sliding direction, wherein the first sleeve limiting portion and the first shaft limiting portion match each other in shape; the shaft rotation contact surface has a second shaft limiting portion (protrusion or depression) arranged along the rotation direction, and the sleeve rotation contact surface has a second sleeve limiting portion arranged along the rotation direction, wherein the second sleeve limiting portion and the second shaft limiting portion match each other in shape. Such a setting can accurately locate the positional relationship between the door and the frame, and when used on a car refrigerator, it avoids mutual displacement between the door and the frame, which affects the insulation of the refrigerator.

[0035] In some embodiments, the difference between the distance between the two opposing sleeve sliding contact surfaces and the minimum parallel tangent distance is less than 2, 3, 4, or 5 times the machining error. The distance between the two opposing sleeve sliding contact surfaces is the minimum dimension of the sleeve side opening, and the minimum parallel tangent distance is the maximum dimension of the shaft in the sliding direction. The difference between the two is less than 2, 3, 4, or 5 times the machining error, so that when the shaft enters the sleeve through the side opening, the two achieve a tighter fit.

[0036] In some embodiments, the easily detachable door hinge system has two groups of sliding contact surfaces of the shaft body, and the angle between the two groups of parallel tangents of the shaft body in contact with the two groups of 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 opposing sleeve sliding contact surfaces is less than 2 times, 3 times, 4 times, or 5 times the processing error. At least one of the two parallel lines of any group of the two groups of parallel tangents of the shaft body contacts the sliding contact surface of the shaft body inside the cylinder where the shaft body is located, and the minimum parallel tangent distance of any group of the shaft body is less than the diameter of the cylinder where the shaft body is located, so that the shaft body can enter or exit the sleeve through the side opening of the sleeve along the direction of any group of the minimum parallel tangents, that is, the door hinge system can be disassembled and assembled from two different angles.

[0037] In some embodiments, the outer side of the side opening of the sleeve has a sleeve sliding contact surface expansion, and the width of the expansion is greater than the distance between the two opposing sleeve sliding contact surfaces, so that the shaft body can be guided into the side opening through the expansion, which is more convenient for installation.

[0038] In some embodiments, the area of the shaft sliding contact surface is less than or equal to the area of the shaft rotation contact surface. A larger shaft rotation contact area can provide more stable rotation performance.

[0039] The present application also discloses a box, such as a car refrigerator, which comprises a tank body and a cover body, wherein the tank body and the cover body are connected by any of the aforementioned easily detachable door hinge systems, thereby enabling quick assembly and disassembly of the tank body and the cover body.

[0040] In some embodiments, the shaft of the box body is connected to the groove body, and the sleeve is connected to the cover body. The shaft body is arranged on the groove body, so that no protrusions will appear on the cover body, thereby avoiding scratches.

[0041] In some embodiments, the shaft of the housing is connected to the groove in a rotatable and fixed manner, so that the angle of the sliding contact surface of the shaft can be adjusted as needed to set the optimal entry / exit angle between the shaft and the sleeve.

[0042] In some embodiments, an indicator for displaying the direction of the minimum parallel tangent of the shaft is provided on the outside of the box. Optionally, the indicator is fixedly connected to the shaft so that when the shaft rotates, the indicator automatically indicates a new angle.

[0043] The above ranges can be used alone or in combination. The present application can be more easily understood through the following examples.

[0044] Example

[0045] Example 1

[0046] Reference Figure 1This embodiment discloses an easily detachable door hinge system. It includes a shaft body 100 and a shaft sleeve 200. The outer surface of the shaft body includes a shaft body sliding contact surface 110 and a shaft body rotation contact surface 120, wherein the shaft body rotation contact surface 120 coincides with the outer surface of the cylinder where the shaft body is located. The shaft body sliding contact surface 110 includes two opposite parts on the shaft body. The shaft body sliding contact surface is two mutually parallel planes. The minimum distance between the parallel tangents of the shaft body in contact with the shaft body sliding contact surface is less than the diameter of the cylinder where the shaft body is located. The shaft sleeve 200 has an inner opening 210 and The side opening 220 has two opposing sleeve sliding contact surfaces 221 for mating with the shaft sliding contact surface 110. The inner opening 210 has a sleeve rotational contact surface 211 for mating with the shaft rotational contact surface 120, allowing the shaft to enter or exit the sleeve 200 along the direction of the minimum parallel tangent through the sleeve's side opening 220. The sleeve rotational contact surfaces 211 and the shaft rotational contact surface 120 cooperate to achieve rotation of the shaft within the sleeve. The sleeve's side opening has a sleeve sliding contact surface flare 222 on the outside. The flare 222 is wider than the distance between the two opposing sleeve sliding contact surfaces 221, allowing the shaft to be guided into the side opening through the flare, facilitating installation. The difference between the distance between the two opposing sleeve sliding contact surfaces and the minimum parallel tangent distance is less than twice the machining error, ensuring a tight fit between the shaft and sleeve.

[0047] Reference Figure 2 and Figure 3 , the shaft body enters the sleeve and cannot come out after rotating to a certain angle, thus forming a stable connection ( Figure 3 From left to right, it shows the process of the shaft body entering the sleeve from the side opening and the sleeve rotating to form a stable connection). Only by rotating the shaft body and sleeve back to the position when the shaft body enters the sleeve can the two be separated, thereby realizing the rapid disassembly and assembly of the door hinge system.

[0048] Example 2

[0049] Reference Figures 4 to 6 This embodiment discloses a vehicle-mounted refrigerator, which has a trough body 300 and a cover body 400, and the trough body 300 and the cover body 400 are connected by the easily detachable door shaft system described in Example 1.

[0050] like Figure 4 As shown, the shaft body 100 is connected to the tank body 300, as shown in FIG. Figure 5 As shown, the sleeve 200 is connected to the cover 400. Figure 6A schematic diagram showing a door axis connection system forming a stable connection when the vehicle refrigerator is closed is shown, wherein the dotted box shows the door axis system described in Example 1.

[0051] If the car refrigerator needs to be opened, the cover body 400 only needs to be rotated at a small angle in the opening direction, and the sleeve 200 and the shaft body 100 will form a separable position relationship. At this time, the entire cover body 400 can be removed and the car refrigerator can be fully opened. By adopting the technical solution disclosed in this embodiment, there is no need to consider the large space required to open the refrigerator during design and installation, which saves space in the car and makes it convenient to take items from multiple angles.

[0052] Example 3

[0053] Reference Figure 7 and Figure 8 This embodiment discloses another easily detachable door shaft system, which includes a shaft body 100 and a shaft sleeve 200. The structure of the shaft sleeve is consistent with that of embodiment 1. Figure 7 As shown, its outer surface includes a shaft sliding contact surface 110 and a shaft rotating contact surface 120. The shaft sliding contact surface 110 includes two opposite parts on the shaft, wherein the shaft sliding contact surface 110 has an elliptical surface. The elliptical surface makes the sliding contact surface have a narrower end near the shaft rotating contact surface, so that the shaft can more easily enter the sleeve from the narrow end. The minimum distance between the parallel tangents of the shaft that contact the shaft sliding contact surface is 2 / 3 of the diameter of the cylinder where the shaft is located ( Figure 7 The dotted line in the figure shows the cross section of the cylinder), so that the shaft body cannot come out after entering the sleeve and rotating a certain angle, thereby forming a stable connection (such as Figure 8 As shown), rotate the shaft and sleeve again to separate the two, thus completing quick disassembly and assembly.

[0054] Example 4

[0055] Reference Figure 9 and Figure 10 This embodiment discloses another easily detachable door shaft system, which includes a shaft body 100 and a shaft sleeve 200. The structure of the shaft sleeve is consistent with that of embodiment 1. The shaft body structure is as follows: Figure 9 As shown, its outer surface includes a shaft sliding contact surface 110 and a shaft rotating contact surface 120, wherein the shaft sliding contact surface 110 includes two opposite parts on the shaft, one of which is a plane and is located inside the cylinder where the shaft is located ( Figure 9The dotted line in the figure shows the cross section of the cylinder), and the sliding contact surface of the other part of the shaft body coincides with a part of the shaft body rotation contact surface 120. The minimum distance between the parallel tangents of the shaft body in contact with the sliding contact surface of the shaft body is 5 / 6 of the diameter of the cylinder where the shaft body is located, so that the shaft body cannot be dislodged after entering the sleeve and rotating a certain angle, thereby forming a stable connection (such as Figure 9 As shown), rotate the shaft and sleeve again to separate the two, thus completing quick disassembly and assembly.

[0056] Example 5

[0057] Reference Figures 11 to 14 This embodiment discloses another easily detachable door shaft system, which includes a shaft body 100 and a shaft sleeve 200. The structure of the shaft sleeve is consistent with that of embodiment 1. The shaft body structure is as follows: Figure 11 As shown, its outer surface includes a shaft sliding contact surface 110 and a shaft rotating contact surface 120, and there are two sets of shaft sliding contact surfaces. The angle between the two sets of parallel tangents of the shaft in contact with the two sets of shaft sliding contact surfaces is 80 degrees. Figure 12 A schematic diagram of two groups of parallel tangents of the shaft is shown. It can be seen from the figure that one of the two parallel lines in each group contacts the sliding contact surface of the shaft inside the cylinder where the shaft is located (the dotted line in the figure shows the cross-section of the cylinder), and the other line contacts the outer surface of the cylinder where the shaft is located. At this time, the corresponding sliding contact surface of the shaft coincides with a part of the rotating contact surface of the shaft.

[0058] The arrangement of this embodiment enables the shaft body to enter or exit 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 door shaft system can be disassembled and assembled from two different angles. Figure 13 and Figure 14 The process of achieving door axis connection at different angles is shown respectively.

[0059] Example 6

[0060] Reference Figures 15 to 18 This embodiment discloses another easily detachable door shaft system, which includes a shaft body 100 and a shaft sleeve 200. The structure of the shaft sleeve is consistent with that of embodiment 1. The shaft body structure is as follows: Figure 15 As shown, its outer surface includes a shaft sliding contact surface 110 and a shaft rotation contact surface 120, and there are two sets of shaft sliding contact surfaces. The angle between the two sets of parallel tangents of the shaft in contact with the two sets of shaft sliding contact surfaces is 45 degrees. Figure 16 A schematic diagram of two groups of parallel tangents of the shaft is shown. It can be seen from the figure that both groups of parallel lines are in contact with the sliding contact surface of the shaft inside the cylinder where the shaft is located (the dotted line in the figure shows the cross-section of the cylinder).

[0061] The arrangement of this embodiment enables the shaft body to enter or exit 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 door shaft system can be disassembled and assembled from two different angles. Figure 17 and Figure 18 The process of achieving door axis connection at different angles is shown respectively.

[0062] The foregoing description is merely an exemplary embodiment of the present disclosure and is not intended to limit the scope of protection of the present disclosure. The scope of protection of the present disclosure is determined by the appended claims.

Claims

1. An easily detachable door shaft system for a vehicle refrigerator, comprising a shaft body and a shaft sleeve, characterized in that: The outer surface of the shaft body includes a shaft body sliding contact surface and a shaft body rotating contact surface, wherein The rotating contact surface of the shaft coincides with the outer surface of the cylinder where the shaft is located. The shaft sliding contact surface includes two opposite parts on the shaft, and the minimum distance between the parallel tangents of the shaft that contact the shaft sliding contact surface is called the minimum parallel tangent distance, and the minimum parallel tangent distance is less than the diameter of the cylinder where the shaft is located. The shaft sleeve has an inner opening and a side opening, and the side opening has two opposite sleeve sliding contact surfaces for cooperating with the sliding contact surface of the shaft body; the inner opening has a sleeve rotating contact surface for cooperating with the rotating contact surface of the shaft body, so that the shaft body can enter or escape from the shaft sleeve through the side opening of the shaft sleeve along the direction of the minimum parallel tangent, and the sleeve rotating contact surface and the shaft body rotating contact surface cooperate with each other to realize the rotation of the shaft body in the shaft sleeve. There are two groups of sliding contact surfaces of the shaft bodies, and the angle between the parallel tangents of the two groups of shaft bodies in contact with the two groups of sliding contact surfaces of the shaft bodies is between 30 and 120 degrees, thereby realizing the disassembly and assembly of the door shaft system from two different angles.

2. The easily detachable door hinge system according to claim 1, wherein the sliding contact surface of the hinge body comprises a plane.

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

4. The easily detachable door hinge system according to claim 1, wherein the sliding contact surface of the shaft body has a first shaft body limiting portion arranged along the sliding direction, the first shaft body limiting portion is a protrusion or a depression, and the sliding contact surface of the sleeve has a first sleeve limiting portion arranged along the sliding direction, wherein the first sleeve limiting portion and the first shaft body limiting portion match each other in shape; The shaft body rotation contact surface has a second shaft body limiting portion arranged along the rotation direction, the second shaft body limiting portion is a protrusion or a depression, and the sleeve rotation contact surface has a second sleeve limiting portion arranged along the rotation direction, wherein the second sleeve limiting portion and the second shaft body limiting portion match each other in shape.

5. The easily detachable door shaft system according to claim 2, wherein the sliding contact surface of the shaft body includes 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.

6. The easily detachable door hinge system according to claim 5, wherein: The distance between the parallel planes is between 2 / 5 and 2 / 3 of the diameter of the cylinder where the shaft body is located.

7. The easily detachable door axis system according to claim 2, wherein the sliding contact surface of the axis body is 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 axis body is located.

8. The easily detachable door hinge system according to claim 7, wherein: The distance between the parallel planes is between 2 / 5 and 2 / 3 of the diameter of the cylinder where the shaft body is located.

9. The easily detachable door shaft system according to claim 1, wherein the outer side of the side opening of the sleeve has a sleeve sliding contact surface expansion, and the width of the expansion is greater than the distance between the two opposite sleeve sliding contact surfaces.

10. The easily detachable door hinge system according to claim 1, wherein the area of the sliding contact surface of the hinge is less than or equal to the area of the rotating contact surface of the hinge.

11. A vehicle-mounted refrigerator comprising a trough body and a cover body, wherein the trough body and the cover body are connected by the easily detachable door hinge system according to any one of claims 1 to 10. 12 . The vehicle refrigerator according to claim 11 , wherein the shaft body is connected to the trough body, the shaft sleeve is connected to the cover body, and the shaft body is connected to the trough body in a rotatable and fixed manner. 13 . The vehicle refrigerator according to claim 12 , wherein an indicator for displaying the direction of the minimum parallel tangent line of the shaft is provided on an outer side of the vehicle refrigerator.

14. The vehicle refrigerator according to claim 13, wherein the indicator is fixedly connected to the shaft, so that when the shaft rotates, the indicator automatically indicates a new angle.

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