A urea tank and fuel tank integrated device

Abstract

This application relates to an integrated device for a urea tank and a fuel tank, which comprises: a first groove is provided on one end face of a first box body, and a first raised ring is provided on the outer periphery of this end face; a second box body, on one end face of which there is a second groove, and a second raised ring is provided on the outer periphery of this end face; a hoop assembly for abutting the first raised ring and the second raised ring, and the end faces of the first box body and the second box body are attached to each other so that the first box body and the second box body are connected in series. The hoop assembly cooperates with the first raised ring and the second raised ring to tightly connect the first box body and the second box body into a whole, avoiding separation and displacement between the first box body and the second box body during operation; at the same time, the first groove and the second groove can compensate for the deformation of the first box body and the second box body during operation, preventing the two end faces from being squeezed without a space for yielding and cracking, with higher reliability, and there will be no fuel leakage or urea leakage, avoiding the problems of engine flameout or non-compliance of after-treatment emissions.

Description

Technical Field

[0001] This application relates to the technical field of vehicle parts, and particularly relates to an integrated device for urea tank and fuel tank. Background Art

[0002] The demand for vehicle lightweighting and the like is becoming increasingly urgent, which has given rise to the need to strengthen the utilization of modularization at the beginning of vehicle design, combine various traditional modules as much as possible, and use new materials to replace traditional iron and aluminum alloy materials to achieve the purpose of maximum lightweighting. In addition, as containers for urea solution and fuel, the urea tank and fuel tank themselves have been given more requirements related to the overall vehicle layout in the design process. Therefore, the development of the urea tank provides strong support for the space layout of the whole vehicle or some special vehicle models. The materials of the urea tank body and fuel tank body mainly focus on polyethylene and aluminum alloy. Currently, most engine factories are basically supporting plastic polyethylene materials, which have the advantages of strong corrosion resistance, easy molding, can be developed into different shapes according to customer needs through blow molding and blow molding processes, light weight, and short production cycle. In the development process of the existing urea tank and fuel tank, it mainly focuses on solving the problem of lightweight production from the material perspective, but in practice, it rarely considers from the perspective of the overall vehicle layout. Since the existing urea tank and fuel tank are each in a split structure, this split urea tank has the problem of difficult assembly, requires more assembly parts and precautions, and is very inconvenient. In addition, the split structure is not only not conducive to lightweight production but also has more requirements for space, so many have adopted the integrated method of urea tank and fuel tank.

[0003] In some related technologies, the fuel tank is generally made of aluminum alloy material, and the urea tank is made of plastic material. The current integrated solutions for urea tank and fuel tank on the market are to leave a certain length of space on the aluminum alloy fuel tank for the urea tank to use. However, since aluminum alloy is not resistant to urea, a layer of urea-resistant plastic needs to be added to the inner wall of the aluminum alloy tank; some use coating processes, and some perform rotational molding inside the aluminum alloy cavity. The urea solution is filled in the innermost plastic cavity, that is, the original non-integrated urea tank is transplanted into the fuel tank, but it has the following problems:

[0004] (1) Since a plastic urea cavity is added inside the existing aluminum alloy fuel tank cavity, the fuel is in the fuel cavity of the placed fuel tank, and the urea is in the urea cavity. There is an aluminum alloy plate and a plastic shell between the two cavities, and the sealing requirement at this place is very high. During actual operation, the plastic shell and the aluminum alloy plate are very likely to crack due to road vibration and liquid impact; fuel entering the urea cavity causes unqualified emissions, and urea entering the fuel cavity causes serious failures such as engine stalling.

[0005] (2) In the above arrangement, the plastic shell containing urea is fixedly installed in the fuel tank shell through the external aluminum alloy shell, which makes the overall urea tank and fuel tank integrated structure heavier and more expensive. Summary of the invention

[0006] The embodiment of the present application provides a urea tank and fuel tank integrated device to solve the problem of easy cracking caused by the plastic shell containing urea being arranged inside the aluminum alloy fuel tank in the related art.

[0007] In a first aspect, a urea tank and a fuel tank integrated device is provided, comprising:

[0008] A first box body, having a first groove on one end surface thereof, and a first raised ring on the outer periphery of the end surface;

[0009] A second box body, one end surface of which has a second groove, and the outer periphery of the end surface is provided with a second raised ring;

[0010] The band assembly is used to abut the first raised ring and the second raised ring, and fit the end faces of the first box and the second box, so that the first box and the second box are connected in series. The band assembly connects the first box and the second box in series. Since the end faces of the two are abutted, the first raised ring and the second raised ring are abutted, and are engaged with the band assembly, the first box and the second box are tightly connected into a whole, avoiding separation and movement between the first box and the second box during operation; at the same time, the first groove and the second groove can compensate for the deformation of the first box and the second box during operation, and prevent the two end faces from being squeezed and broken without a retreat space when the connection is tightly fitted, with higher reliability, no oil and urea leakage, and avoiding the problem of engine stalling or post-treatment emissions not meeting the standards.

[0011] In some embodiments, the diameter of the first raised circle is equal to the diameter of the second raised circle, and they are located on the same horizontal plane when connected.

[0012] In some embodiments, the diameter of the first raised ring is greater than the diameter of the second raised ring, and when connected, the first raised ring is pressed against the outside of the second raised ring, and a gasket is provided between the first raised ring and the second raised ring; or,

[0013] The diameter of the first raised circle is smaller than that of the second raised circle, and the second raised circle is pressed onto the outside of the first raised circle during connection, and a gasket is provided between the first raised circle and the second raised circle.

[0014] In some embodiments, the cuff assembly includes a cuff, a surface of which is provided with a slot; two ends of the cuff are respectively provided with a first connector and a second connector; the first connector and the second connector are detachably connected.

[0015] In some embodiments, the strap includes an elastic part, a rigid part is provided on the outer side of the elastic part, and the card slot is arranged on the elastic part. The inclined plane of the card slot on the strap generates a lateral force, squeezing the first raised ring and the second raised ring so that they are abutted against each other, and tightly assembling the first box body and the second box body together to form a reliable integral device.

[0016] In some embodiments, the elastic part is made of rubber and the rigid part is made of metal; the elastic part and the rigid part are vulcanized and connected. The elastic part is made of rubber and the rigid part is made of metal; the elastic part and the rigid part are vulcanized and connected. The consideration of this design is to provide a certain stiffness while ensuring the stability of the connection, and also provide a certain elasticity to avoid abrasion when contacting the first raised ring and the second raised ring, and have a damping effect. That is, the elastic part on the inner layer of the strap is vulcanized on the outer layer of the metal steel belt, which can effectively protect the urea tank shell and the aluminum alloy shell from abrasion and is not easy to delaminate.

[0017] In some embodiments, the first connector includes a first ear, a first cross bar is provided on the first ear, and a screw is passed through the first cross bar;

[0018] The second connector includes a second ear, and a second cross bar is provided on the second ear; when connecting, the screw passes through the first cross bar and the second cross bar and is locked by a nut. When connecting, the screw passes through the first cross bar and the second cross bar and is locked by a nut; when disassembling, reverse the nut. The two ends of the strap adopt the structural form of ears and bolts, which is convenient to tighten and has a good tightening effect.

[0019] In some embodiments, the ratio of the projected area of the first groove on the end face of the first box body to the area of this end face is 0.5 - 0.9;

[0020] The ratio of the projected area of the second groove on the end face of the second box body to the area of this end face is 0.5 - 0.9;

[0021] The first groove and the second groove coincide or partially coincide when the first box body and the second box body are connected.

[0022] In some embodiments, the second box body is made of hard plastic and a urea pump is provided thereon; the first box body is made of aluminum alloy.

[0023] In some embodiments, the first box body is provided with a mounting bracket, and the first box body is connected to the vehicle body structure through the mounting bracket.

[0024] The beneficial effects brought by the technical solution provided by this application include: (only write the benefits of the independent claim)

[0025] The embodiment of the present application provides a urea tank and fuel tank integrated device. The first box body and the second box body respectively contain fuel and urea. One end face of the first box body has a first groove, and a first raised ring is provided on the outer periphery of this end face; one end face of the second box body has a second groove, and a second raised ring is provided on the outer periphery of this end face; when connecting, the hoop band assembly connects the first box body and the second box body in series. Since the end faces of the two are in abutment, the first raised ring and the second raised ring are in abutment and are engaged with the hoop band assembly, so that the first box body and the second box body are tightly connected into a whole, avoiding separation and crosstalk between the first box body and the second box body during operation; at the same time, the first groove and the second groove can compensate for the deformation of the first box body and the second box body during operation, preventing the two end faces from being squeezed without a space for yielding and cracking, with higher reliability, no fuel crosstalk and urea crosstalk, and avoiding the problems of engine stalling or unqualified post-treatment emissions.

[0026] In addition, the cross-section of the first box body is the same as that of the second box body, which can maximize the internal volume and increase the capacity of urea. At the same time, the first box body and the second box body are connected into a whole and can share an installation bracket, that is, the original fuel tank bracket, without the need to additionally set up a urea tank bracket, simplifying the structure. Brief Description of the Drawings

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for use in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0028] Figure 1 It is a schematic structural diagram of the urea tank and fuel tank integrated device with an installation bracket provided by the embodiment of the present application;

[0029] Figure 2 It is a schematic structural diagram of the connection part between the first box body and the second box body provided by the embodiment of the present application;

[0030] Figure 3 It is a schematic structural diagram of the connection part between the first box body and the second box body of another structure provided by the embodiment of the present application;

[0031] Figure 4 It is a schematic structural diagram of the connection between the first connector and the second connector provided by the embodiment of the present application.

[0032] In the figure: 1. First box body; 100. First groove; 101. First raised ring; 2. Second box body; 200. Second groove; 201. Second raised ring; 3. Band assembly; 300. Band; 301. Card slot; 302. First connector; 303. Second connector; 4. Mounting bracket; 5. Washer; 6. Urea pump. Detailed implementation manners

[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Apparently, the described embodiments are some but not all of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0034] The embodiments of the present application provide a urea tank and fuel tank integrated device to solve the problem of easy cracking caused by arranging a plastic housing for accommodating urea inside an aluminum alloy fuel tank in the related art.

[0035] Please refer to Figures 1 - 3 , a urea tank and fuel tank integrated device, which includes:

[0036] A first box body 1, a second box body 2, and a band assembly 3;

[0037] Wherein, one end face of the first box body 1 has a first groove 100, and a first raised ring 101 is provided on the outer periphery of this end face; the first raised ring 101 is a part of the first box body 1, a structure formed by raising, and has the same shape as the outer contour of the cross-section of the first box body 1; the first raised ring 101 can also be an annular structure fixedly connected to the first box body 1 and having the same shape as the outer contour of the cross-section of the first box body 1.

[0038] One end face of the second box body 2 has a second groove 200, and a second raised ring 201 is provided on the outer periphery of this end face; the second raised ring 201 is a part of the second box body 2, a structure formed by raising, and has the same shape as the outer contour of the cross-section of the second box body 2; the second raised ring 201 can also be an annular structure fixedly connected to the second box body 2 and having the same shape as the outer contour of the cross-section of the second box body 2; the shapes of the second groove 200 and the first groove 100 are not specifically limited. For example, they can be circular, diamond-shaped, rectangular, triangular, trapezoidal, etc. The second groove 200 and the first groove 100 together form a deformation avoidance space.

[0039] The first box body 1 and the second box body 2 are connected in series by a hoop band assembly 3, that is, the hoop band assembly 3 binds the periphery of the connection part of the first box body 1 and the second box body 2; after the connection is completed, the end faces of the first box body 1 and the second box body 2 are attached; the first raised ring 101 and the second raised ring 201 abut against each other and are engaged with the hoop band assembly 3.

[0040] When connecting, the hoop band assembly 3 connects the first box body 1 and the second box body 2 in series. Since the end faces of the two abut against each other, the first raised ring 101 and the second raised ring 201 abut against each other and are engaged with the hoop band assembly 3, so that the first box body 1 and the second box body 2 are tightly connected into a whole, avoiding separation and crosstalk between the first box body 1 and the second box body 2 during operation; at the same time, the first groove 100 and the second groove 200 can compensate for the deformation of the first box body 1 and the second box body 2 during operation, preventing the two end faces from being squeezed without a retreat space and cracking when they are tightly attached, with higher reliability, no oil crosstalk and urea crosstalk, and avoiding the problems of engine flameout or unqualified post-treatment emissions.

[0041] In addition, the cross-section of the first box body 1 is the same as that of the second box body 2, which can maximize the internal volume of the second box body 2 for installing urea, increase the urea capacity. At the same time, the first box body 1 and the second box body 2 are connected into a whole and can share an installation bracket 4, that is, the original fuel tank bracket, without the need to separately set up a urea tank bracket, simplifying the structure and reducing the cost.

[0042] In some preferred embodiments, refer to Figure 2 and Figure 3 , there are the following several forms for the structure of the first raised ring 101 and the second raised ring 201 when connecting:

[0043] First, the diameter of the first raised ring 101 is equal to the diameter of the second raised ring 201, and they are on the same horizontal plane when connecting. As shown in the structure of Figure 2 , when connecting, the first raised ring 101 is engaged with the hoop band assembly 3, and the second raised ring 201 is also engaged with the hoop band assembly 3. They are arranged side by side, so that the hoop band assembly 3 restricts the first raised ring 101 and the second raised ring 201 to avoid lateral crosstalk.

[0044] Second, the diameter of the first raised ring 101 is greater than the diameter of the second raised ring 201, and the first raised ring 101 is pressed outside the second raised ring 201 when connecting, and a washer 5 is provided between the first raised ring 101 and the second raised ring 201.

[0045] The gasket 5 is made of elastic wear-resistant material, which can be polyurethane elastomer. From the perspective of molecular structure, polyurethane elastomer is a block polymer, and its molecular chain is generally composed of two parts. At room temperature, one part is in a highly elastic state, called a soft segment; the other part is in a glassy or crystalline state, called a hard segment. Generally, the soft segment is composed of a long flexible chain of polymer polyol, and the hard segment is composed of isocyanate and chain extender. The soft segment and the hard segment are arranged alternately to form a repeating structural unit. In addition to the carbamate group, the main chain of the polyurethane molecule also contains polar groups such as ether, ester or urea. Due to the presence of a large number of these polar groups, hydrogen bonds can be formed within and between polyurethane molecules. The soft segment and the hard segment induce the formation of hard segment and soft segment micro-regions due to thermodynamic incompatibility and produce a microscopic phase separation structure. Even linear polyurethane can form physical crosslinks through hydrogen bonds. Hydrogen bonds exist between groups containing highly electronegative nitrogen atoms and oxygen atoms and groups containing hydrogen atoms, and are related to the cohesive energy of the groups. The polarity of the urethane and urea groups in the hard segment is relatively strong, and hydrogen bonds mostly exist between these segments. Compared with the bonding force of the chemical bonds within the molecule, the hydrogen bond force is much smaller. However, the presence of a large number of hydrogen bonds in polar polymers is also one of the important factors affecting performance. Hydrogen bonds are reversible. At lower temperatures, the close arrangement of polar segments promotes the formation of hydrogen bonds: at higher temperatures, the segments receive energy and undergo thermal motion, the distance between segments and molecules increases, and the hydrogen bonds weaken or even disappear. This physical cross-linking effect of hydrogen bonds exhibits perfect wear resistance under slurry conditions, which can make the polyurethane body have higher strength, wear resistance, solvent resistance and smaller tensile permanent deformation. The more hydrogen bonds there are, the stronger the intermolecular force is, and the higher the strength of the material is. The amount of hydrogen bonds directly affects the microphase separation of the system.

[0046] These structural features give polyurethane elastomers excellent wear resistance and toughness.

[0047] When connected, the second raised ring 201 is located inside the first raised ring 101, and a gasket 5 is arranged between the two, and the band assembly 3 is arranged on the periphery of the first raised ring 101, so as to Figure 3 As shown, the first raised ring 101 and the second raised ring 201 are tightly connected. Since the cross-sections of the first raised ring 101 and the second raised ring 201 are arc-shaped, they cannot move in the horizontal direction when they are pressed against each other. Therefore, only the first raised ring 101 and the cuff assembly 3 need to be engaged.

[0048] The third type is that the diameter of the first raised circle 101 is smaller than the diameter of the second raised circle 201, and when connected, the second raised circle 201 is pressed on the outside of the first raised circle 101, and a gasket 5 is provided between the first raised circle 101 and the second raised circle 201; the gasket 5 is used to avoid wear generated during the abutment process, and has a vibration reduction effect to avoid affecting the tightness of the connection of the hoop assembly 3 when subjected to external vibrations.

[0049] The washer 5 is made of an elastic wear-resistant material. When connecting, the first raised ring 101 is located inside the second raised ring 201, and the washer 5 is arranged between them. The hoop band assembly 3 is arranged on the periphery of the second raised ring 201 to tightly connect the first raised ring 101 and the second raised ring 201. Since the cross-sections of the first raised ring 101 and the second raised ring 201 are arc-shaped, when they are abutted and pressed together, they cannot move in the horizontal direction. Therefore, only the second raised ring 201 and the hoop band assembly 3 need to be engaged.

[0050] The above gives several forms in which the hoop band assembly 3 abuts the first raised ring 101 and the second raised ring 201 to complete the connection during connection. Of course, other realizable ways are not excluded.

[0051] In some preferred embodiments, regarding how to provide an avoidance space to provide a buffer space for deformation, it is related to the areas of the first groove 100 and the second groove 200. Therefore, the following settings are made:

[0052] Since the first groove 100 and the second groove 200 are formed by sheet metal pressing or stamping.

[0053] The ratio of the projected area of the first groove 100 on the end face of the first box body 1 to the area of this end face is 0.5 - 0.9; it defines the selectable range of the size of the first groove 100, as long as it is ensured that the end face of the first box body 1 has a mating surface.

[0054] The ratio of the projected area of the second groove 200 on the end face of the second box body 2 to the area of this end face is 0.5 - 0.9; it defines the selectable range of the size of the second groove 200, as long as it is ensured that the end face of the second box body 2 has a mating surface

[0055] The first groove 100 and the second groove 200 overlap or partially overlap when the first box body 1 and the second box body 2 are connected. This indicates that the first groove 100 and the second groove 200 may not be on the same axis, or may be in the case of being on the same axis as shown in Figure 2 and Figure 3 and can be selected according to needs.

[0056] In some preferred embodiments, the following settings are made for the specific structure of the hoop band assembly 3:

[0057] The hoop band assembly 3 includes a hoop band 300. A card slot 301 is provided on one surface of the hoop band 300; first connection heads 302 and second connection heads 303 are respectively provided at both ends of the hoop band 300; the first connection heads 302 and the second connection heads 303 are detachably connected.

[0058] When connecting, according to the structures of the first raised ring 101 and the second raised ring 201 shown above, one side of the hoop band 300 can be clamped with the first raised ring 101 and the second raised ring 201; it can also be only clamped with the first raised ring 101; or it can be only clamped with the second raised ring 201; after the clamping is completed, the first connecting head 302 and the second connecting head 303 are used to connect and fasten the hoop band 300 tightly.

[0059] Furthermore, the structure of the hoop band 300 is as follows: the hoop band 300 includes an elastic part, a rigid part is arranged on the outer side of the elastic part, and a clamping groove 301 is arranged on the elastic part; the elastic part is made of rubber, and the rigid part is made of metal; the elastic part and the rigid part are vulcanized and connected, and the elastic part is on the side close to the first box body 1 and the second box body 2. The combination of the elastic part and the rigid part makes the hoop band 300 have rigidity, and when a fixing force is applied, it will not cause damage to the first box body 1 and the second box body 2.

[0060] The consideration of this design is to provide a certain degree of rigidity while ensuring the stability of the connection, and also to provide a certain degree of elasticity to avoid abrasion when contacting the first raised ring 101 and the second raised ring 201, and to have a vibration damping effect. That is, the elastic part inside the hoop band 300 is vulcanized on the outer metal steel strip, which can effectively protect the urea tank shell and the aluminum alloy shell from being worn and is not easy to be de-bonded.

[0061] Furthermore, to achieve the detachable connection of the first connecting head 302 and the second connecting head 303, the following connection forms are available:

[0062] As Figure 4 shown, the first connecting head 302 includes a first ear, a first cross bar is arranged on the first ear, and a screw is passed through the first cross bar; the second connecting head 303 includes a second ear, and a second cross bar is arranged on the second ear; when connecting, the screw passes through the first cross bar and the second cross bar, and is locked by a nut; when disassembling, the nut is rotated in the reverse direction. The two ends of the hoop band 300 adopt the structural form of ears and bolts, which is convenient to tighten and has a good fastening effect.

[0063] During the assembly of the device, the end faces of the first box body 1 and the second box body 2 are in contact. When the outer ring connecting hoop band 300 is tightened through the cooperation of the screw and the nut, the inclined plane of the clamping groove 301 on the hoop band 300 generates a lateral force, squeezing the first raised ring 101 and the second raised ring 201, so that the two are abutted against each other, and the first box body 1 and the second box body 2 are tightly assembled together to form a reliable whole device.

[0064] In another disassembly form, the first connector 302 and the second connector 303 can both be bolts connected to the strap 300, and the bolts are threadedly connected to the middle connecting block. It can also be the connection buckle structure in the relevant mountaineering rope, such as the one in CN204099499U, which includes a first tapered expansion screw, an internally threaded single knot container, an externally threaded single knot container threadedly connected to the internally threaded single knot container, and a second tapered expansion screw. The first and second tapered expansion screws are respectively threadedly connected to the internally and externally threaded single knot containers. A spring device for preventing the single knot from shaking is provided at the connection between the internally threaded single section container and the externally threaded single knot container. The spring device is composed of two disc-shaped wooden boards pressed against the mountaineering rope single knot connected by a spring.

[0065] In some preferred embodiments, the second box body 2 is made of hard plastic and is provided with a urea pump 6 thereon; the first box body 1 is made of aluminum alloy; an installation bracket 4 is provided on the first box body 1, and the first box body 1 is connected to the vehicle body structure through the installation bracket 4. The second box body 2 is an independent structure, and urea and fuel will not intermix due to the rupture of the partition plate as in the traditional structure inside the aluminum alloy cavity, with higher reliability; there is no aluminum alloy shell on the outer layer, the system is light, and the cost is low. The second box body 2 is made of hard plastic, with a relatively light weight, and is fixed to the fuel tank through the strap 300, with a simple structure and easy to implement.

[0066] Among them, there is a urea pump installation port at the top of the second box body 2, and the urea pump 6 is directly assembled with the second box body 2, making the original urea pipe no longer needed; the urea pump 6 mainly consists of a motor, a supply pump, a backflush pump, a switching valve, a pressure chamber, a throttle hole, etc. The urea pump 6 has two working states, supply and emptying. When supplying liquid to the urea injection system, the motor drives the supply pump to transport the urea solution from the urea tank to the pressure chamber. Part of the urea solution is used for injection, and part of it flows back to the urea tank through the throttle hole.

[0067] When used in winter, since the fuel tank and the urea tank are connected in series, the original heating system for the fuel tank can be utilized to transfer heat to the urea tank, so that the urea tank does not need to be additionally provided with a heating device as in the original structure, thereby greatly reducing the system cost and improving the system reliability.

[0068] Working principle:

[0069] (1) The hoop band assembly 3 serially connects the first box body 1 and the second box body 2. Since the end faces of the two are in contact with each other, the first raised ring 101 and the second raised ring 201 are in contact with each other and are engaged with the hoop band assembly 3, so that the first box body 1 and the second box body 2 are tightly connected into a whole, preventing separation and displacement between the first box body 1 and the second box body 2 during operation. At the same time, the first groove 100 and the second groove 200 can compensate for the deformation of the first box body 1 and the second box body 2 during operation, preventing the two end faces from being squeezed without a retreat space and cracking when tightly connected, with higher reliability, no oil leakage or urea leakage, and avoiding problems such as engine stalling or unqualified post-treatment emissions.

[0070] In addition, the cross-section of the first box body 1 is the same as that of the second box body 2, which can maximize the internal volume of the second box body 2 for installing urea, increasing the urea capacity. At the same time, the first box body 1 and the second box body 2 are connected into a whole and can share an installation bracket 4, that is, the original fuel tank bracket, without the need to separately set up a urea tank bracket, simplifying the structure and reducing the cost.

[0071] (2) The hoop band 300 includes an elastic part, a rigid part is provided on the outer side of the elastic part, and a card slot 301 is arranged on the elastic part. The elastic part is made of rubber and the rigid part is made of metal. The elastic part and the rigid part are vulcanized and connected. The consideration of this design is to provide a certain stiffness while ensuring the stability of the connection, and also to provide a certain elasticity to avoid abrasion when contacting the first raised ring 101 and the second raised ring 201, and having a damping effect. That is, the elastic part of the inner layer of the hoop band 300 is vulcanized on the outer layer of the metal steel belt, which can effectively protect the urea tank shell and the aluminum alloy shell from being worn and is not easy to delaminate.

[0072] (3) There is a urea pump installation port on the top of the second box body 2. The urea pump 6 is directly assembled with the second box body 2, eliminating the need for the original urea pipe and not requiring heating in winter, greatly reducing the system cost and improving the system reliability.

[0073] It should be understood that, as shown in the background art, in order to avoid the load structure of sleeving a metal shell outside the original urea tank and then connecting the metal shell to the fuel tank, using the above form, the sleeved metal shell is cancelled, and the plastic urea tank is directly connected to the fuel tank. For the plastic urea tank, a material with both strength and hardness meeting the requirements is required, and soft plastic is obviously not advisable. And a material with both strength and hardness meeting the requirements can be selected from the existing materials according to needs. Considering the cost issue, it can be selected according to the actual situation.

[0074] In the description of the present application, it should be noted that the orientation or positional relationship indicated by terms such as "upper" and "lower" is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present application. Unless otherwise clearly specified and defined, the terms "installed", "connected", and "coupled" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0075] It should be noted that in the present application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variation thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of another identical element in the process, method, article or device including the said element.

[0076] The above are only specific embodiments of the present application, enabling those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but rather to the broadest scope consistent with the principles and novel features claimed herein.

Claims

1. A urea tank and fuel tank integrated device, characterized in that, it includes: A first box body (1), one end face of which has a first groove (100), and a first raised ring (101) is provided on the outer periphery of this end face; A second box body (2), one end face of which has a second groove (200), and a second raised ring (201) is provided on the outer periphery of this end face; A hoop band assembly (3) for abutting the first raised ring (101) and the second raised ring (201), and the end faces of the first box body (1) and the second box body (2) are attached to each other so that the first box body (1) and the second box body (2) are connected in series; The hoop band assembly (3) includes a hoop band (300), a card slot (301) is provided on one side of the hoop band (300); first connection heads (302) and second connection heads (303) are respectively provided at both ends of the hoop band (300); the first connection head (302) and the second connection head (303) are detachably connected; the hoop band (300) includes an elastic part, a rigid part is provided on the outer side of the elastic part, and the card slot (301) is arranged on the elastic part; The inclined surface of the card slot (301) on the hoop band (300) is used to generate a lateral force for pressing the first raised ring (101) and the second raised ring (201) so that the first raised ring (101) and the second raised ring (201) abut against each other.

2. The urea tank and fuel tank integrated device according to claim 1, characterized in that: The diameter of the first raised ring (101) is equal to the diameter of the second raised ring (201), and they are located on the same horizontal plane when connected.

3. The urea tank and fuel tank integrated device according to claim 1, characterized in that: The diameter of the first raised ring (101) is greater than the diameter of the second raised ring (201), and when connected, the first raised ring (101) is pressed on the outside of the second raised ring (201), and a gasket (5) is provided between the first raised ring (101) and the second raised ring (201); or, The diameter of the first raised ring (101) is smaller than the diameter of the second raised ring (201), and when connected, the second raised ring (201) is pressed on the outside of the first raised ring (101), and a gasket (5) is provided between the first raised ring (101) and the second raised ring (201).

4. The urea tank and fuel tank integrated device according to claim 1, characterized in that: The elastic part is made of rubber, and the rigid part is made of metal; the elastic part and the rigid part are vulcanized and connected.

5. The urea tank and fuel tank integrated device according to claim 1, characterized in that: The first connection head (302) includes a first ear, a first cross bar is provided on the first ear, and a screw is passed through the first cross bar; The second connection head (303) includes a second ear, and a second cross bar is provided on the second ear; when connecting, the screw passes through the first cross bar and the second cross bar and is locked by a nut.

6. The urea tank and fuel tank integrated device according to claim 1, characterized in that: The ratio of the projected area of the first groove (100) on the end face of the first box body (1) to the area of this end face is 0.5 - 0.9; The ratio of the projected area of the second groove (200) on the end face of the second box body (2) to the area of the end face is 0.5 - 0.9; When the first box body (1) and the second box body (2) are connected, the first groove (100) and the second groove (200) coincide or partially coincide.

7. The integrated urea tank and fuel tank device according to claim 1, characterized in that: The second box body (2) is made of hard plastic, and a urea pump (6) is provided thereon; the first box body (1) is made of aluminum alloy.

8. The integrated urea tank and fuel tank device according to claim 1, characterized in that: An installation bracket (4) is provided on the first box body (1), and the first box body (1) is connected to the vehicle body structure through the installation bracket (4).

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