Engine hood, method of assembling an engine hood, and engineering machine

Abstract

The application provides an engine hood, an engine hood assembling method and a construction machine, which comprises a front hood assembly, a rear hood assembly and a middle section assembly; the front hood assembly comprises a front framework module and a front skin component mounted outside the front framework module; the rear hood assembly is used for being independently mounted with the front hood assembly along a front-rear direction on a rear frame of the construction machine, and comprises a rear framework module and a rear skin component mounted outside the rear framework module; the middle section assembly comprises a middle section framework component and a middle section skin component mounted outside the middle section framework component, and the front-rear ends of the middle section framework component are respectively mounted on the front framework module and the rear framework module. The application reduces the production cost, realizes the modular installation of the engine hood, and has high assembling efficiency. Moreover, the correlation dimension chain of related parts with strict gap requirements is minimized, and the problems of poor appearance, such as uneven gap and unreasonable surface difference, of the engine hood of the large loader in the prior art are improved.

Description

Technical Field

[0001] This invention belongs to the field of engineering machinery technology, and particularly relates to an engine hood, an engine hood assembly method, and engineering machinery. Background Technology

[0002] For construction machinery such as loaders, the main function of the engine hood is to protect the internal systems of the loader, such as the engine and radiator, from damage, thereby improving the safety performance of the equipment. In addition, the engine hood also serves to prevent dust, reduce noise, and enhance the product's aesthetics.

[0003] Currently, in the construction machinery industry, small and medium-sized loaders typically have a simple engine hood structure, either a single, front- or rear-folding type, due to their small size. However, for large loaders, especially large hybrid loaders, the engine hood needs to cover components such as the battery, engine, radiator, and fan, resulting in a larger and heavier overall engine hood. The single, front- or rear-folding structure is complex, leading to high costs for the engine hood lifting device, making it unsuitable for large loaders.

[0004] Therefore, most large loader engine hoods are designed in sections. However, these sections involve multiple systems or components, resulting in inconsistent assembly standards and long dimensional chains. This leads to high precision requirements in engine hood manufacturing and assembly, and easily results in uneven gaps, unreasonable surface differences, and other aesthetically unappealing issues. Furthermore, the modular engine hood assembly lacks overall integrity, consisting mostly of loose parts that need to be assembled piece by piece into the complete machine. Adjustments to gaps and surface differences largely must be made on the entire machine, leading to lengthy and labor-intensive work at heights, resulting in low assembly efficiency. Summary of the Invention

[0005] The main objective of this invention is to provide an engine hood, an engine hood assembly method, and engineering machinery, aiming to solve the technical problems of low assembly efficiency, uneven gaps, unreasonable surface differences, and poor aesthetics in the prior art.

[0006] To achieve the above objectives, the present invention provides an engine hood for engineering machinery, the engine hood comprising:

[0007] The front hood assembly includes a front frame module and a front skin assembly mounted outside the front frame module;

[0008] The rear cover assembly is used to be installed independently of the front cover assembly in the longitudinal direction on the rear frame of the construction machinery. The rear cover assembly includes a rear frame module and a rear skin assembly installed outside the rear frame module.

[0009] The mid-section assembly includes a mid-section frame assembly and a mid-section skin assembly mounted outside the mid-section frame assembly. The front and rear ends of the mid-section frame assembly are respectively mounted to the front frame module and the rear frame module.

[0010] In this embodiment of the invention, the mid-section skin assembly includes:

[0011] A central top cover is installed on top of the central frame assembly, and the front and rear ends of the central top cover are respectively installed on the front frame module and the rear frame module.

[0012] The side door assembly has a maintenance opening in the middle frame assembly. Two side door assemblies are installed opposite each other at the maintenance opening in the left-right direction. The side door assembly is used to open or close the maintenance opening.

[0013] The two middle skins are arranged opposite each other in the left-right direction, and the side door assembly is located between the middle skins and the central top cover in the up-down direction.

[0014] In this embodiment of the invention, the middle frame assembly includes two middle frames arranged opposite each other in the left-right direction. The middle frame includes a vertical plate and two horizontal plates spaced apart in the up-down direction. The upper and lower ends of the vertical plate are respectively installed on the two horizontal plates, and the front and rear ends of the horizontal plates are respectively installed on the front frame module and the rear frame module.

[0015] In this embodiment of the invention, the mid-section frame assembly further includes a transition bracket for connecting the rear frame and the mid-section skin, the two horizontal plates are an upper horizontal plate and a lower horizontal plate, the mid-section top cover is installed on the upper horizontal plate, the side door latch of the side door assembly is installed on the vertical plate, and the upper and lower ends of the mid-section skin are respectively installed on the lower horizontal plate and the transition bracket.

[0016] In this embodiment of the invention, the side door assembly includes a small side door and a large side door that are independently arranged in the front-rear direction. The length of the large side door is greater than the length of the small side door. The large side door is installed on the rear frame module, and the small side door is installed on the front frame module.

[0017] In this embodiment of the invention, the left and right sides of the central top cover are provided with top cover folded edges for covering the assembly gaps.

[0018] And / or,

[0019] The upper edge of the middle skin is provided with a skin fold for covering assembly gaps.

[0020] In this embodiment of the invention, the front skin assembly includes a front top cover, two upper side plates and two lower side plates located below the upper side plates. The front top cover is installed on the top of the front frame module, the two upper side plates are installed on the side of the front frame module in the left-right direction, and the two lower side plates are installed on the side of the front frame module in the left-right direction.

[0021] And / or,

[0022] The rear skin assembly includes a rear top cover, a rear top window, a rear door, two rear side skin welded joints, and two rear side windows. The rear top cover is installed on the top of the rear frame module, the rear door is installed on the rear side of the rear frame module, and the two rear side skin welded joints are installed on the side of the rear frame module in the left-right direction. Each rear side skin welded joint is provided with a window, and the rear side windows are installed at the window.

[0023] The present invention also proposes an engine hood assembly method, applied to the engine hood described above, the engine hood assembly method comprising:

[0024] The front frame module and front skin assembly are pre-assembled into the front hood assembly, and the rear frame module and rear skin assembly are pre-assembled into the rear hood assembly.

[0025] The front hood assembly and the rear hood assembly are respectively assembled to the rear frame;

[0026] Pre-tighten the middle section frame assembly using connectors;

[0027] The hoisted front cover assembly and rear cover assembly are pre-installed to obtain a rough assembly of the machine cover;

[0028] The middle section skin assembly is assembled onto the rough assembly hood;

[0029] Tighten the connector.

[0030] In this embodiment of the invention, assembling the mid-section skin assembly onto the rough assembly hood includes:

[0031] The middle top cover is installed on the middle frame assembly, and the front and rear ends of the middle top cover are respectively installed on the front frame module and the rear frame module.

[0032] The side door assembly is installed between the front frame module and the rear frame module, so that the two side door assemblies are installed outside the middle top cover in the left-right direction;

[0033] The middle skin is installed on the middle frame assembly.

[0034] The present invention also proposes an engineering machine, which includes the engine hood as described above.

[0035] Through the above technical solution, the engine hood provided in the embodiments of the present invention has the following beneficial effects:

[0036] The engine hood adopts a segmented assembly structure, avoiding the complex structure of existing technologies that require a single, fully-flipped front or rear section, thus reducing production costs. Simultaneously, the front and rear frame modules are independent, providing each hood assembly with its own independent frame and mounting points for its respective skin. This ensures the front and rear skin assemblies are independent, preventing cross-system installation and resulting in a shorter dimensional chain and smaller cumulative assembly errors. Gap and surface differences within each skin assembly can be adjusted during pre-assembly. The components of the mid-section assembly are mounted on the front and rear hood assemblies; on the final assembly, only the gaps and surface differences between relevant components of the mid-section assembly and between these components and the front and rear hood assemblies need to be adjusted. The engine hood is specifically divided into three sections from front to back: the front hood assembly, the middle section assembly, and the rear hood assembly, forming a segmented assembly type engine hood. The front and rear hood assemblies are independently mounted on the rear frame, the middle section frame assembly is mounted on the front and rear hood assemblies, and the middle section skin assembly is assembled on the middle section frame assembly. This invention achieves modular installation of the engine hood, resulting in high assembly efficiency; it also minimizes the dimensional chain of related components with strict clearance requirements, improving upon the aesthetically unpleasing problems of uneven gaps and unreasonable surface differences that often occur in existing engine hood designs.

[0037] Other features and advantages of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0038] The accompanying drawings are provided to illustrate the invention and form part of the specification. They are used together with the following detailed description to explain the invention, but do not constitute a limitation thereof. In the drawings:

[0039] Figure 1 This is a schematic diagram of the structure of an engine hood according to an embodiment of the present invention;

[0040] Figure 2 This is a schematic diagram of the front cover assembly of the engine hood according to an embodiment of the present invention;

[0041] Figure 3 This is a schematic diagram of the breakdown structure of the rear cover of the engine hood according to an embodiment of the present invention;

[0042] Figure 4 This is a schematic diagram of the overall breakdown structure of the middle section of the engine hood according to an embodiment of the present invention.

[0043] Explanation of reference numerals in the attached figures

[0044] Label Name Label Name

[0045] 100 Engine Hood 231 Central Top Cover

[0046] 1 Front hood assembly 232 Top cover fold

[0047] 11 Front frame module 233 Large side door

[0048] 111 Front bracket 234 Small side door

[0049] 112 Front threaded seat 235 Middle skin

[0050] 113 Front support 3 Rear cover assembly

[0051] 114 First top support 31 Rear frame module

[0052] 12 Front skin assembly 311 Rear bracket

[0053] 121 Front Top Cover 312 Rear Threaded Seat

[0054] 122 Upper side plate 313 Rear support

[0055] 123 Lower side plate 314 Second top bracket

[0056] 2. Mid-section assembly 32. Rear skin assembly

[0057] 21-inch frame, 321 rear top cover

[0058] 211 Horizontal panel 322 Rear door

[0059] 212 Vertical plate 323 Rear side skin welding

[0060] 22 Transition bracket 324 Rear side window

[0061] 23 Mid-section skin assembly 200 Rear frame Detailed Implementation

[0062] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0063] The engine hood according to the present invention is described below with reference to the accompanying drawings.

[0064] like Figures 1 to 4As shown, in an embodiment of the present invention, the engine hood 100 is used for construction machinery. The engine hood includes a front hood assembly 1, a rear hood assembly 3, and a mid-section assembly 2. The front hood assembly 1 includes a front frame module 11 and a front skin assembly 12 mounted outside the front frame module 11. The rear hood assembly 3 is used to be independently mounted to the rear frame 200 of the construction machinery along the front-rear direction, and includes a rear frame module 31 and a rear skin assembly 32 mounted outside the rear frame module 31. The mid-section assembly 2 includes a mid-section frame assembly and a mid-section skin assembly 23 mounted outside the mid-section frame assembly. The front and rear ends of the mid-section frame assembly are respectively mounted to the front frame module 11 and the rear frame module 31.

[0065] Understandably, the engine hood 100 in this embodiment is mainly used for loaders. It is mainly designed to improve the aesthetics of existing large loaders with modular, disassembled engine hoods 100, which suffer from poor overall integrity, low assembly efficiency, inconsistent component installation standards, uneven gaps due to excessively long dimensional chains, and unreasonable surface differences. It is suitable for engine hoods 100 of large hybrid loaders.

[0066] In this embodiment, the engine hood 100 adopts a segmented assembly structure, which avoids the complex structure of overall forward or backward flipping in the prior art, reducing production costs. Simultaneously, the front frame module 11 and the rear frame module 31 are independent of each other, giving the front hood assembly 1 and the rear hood assembly 3 their own independent frames and providing their respective skin mounting points. This makes the front skin assembly 12 and the rear skin assembly 32 independent of each other, avoiding cross-system installation of the front skin assembly 12 and the rear skin assembly 32. This results in a shorter dimensional chain and smaller cumulative assembly errors. The gaps and surface differences in each skin assembly can be adjusted during offline pre-assembly. The components of the middle section assembly 2 are installed on the front hood assembly 1 and the rear hood assembly 3. On the complete machine, only the gaps and surface differences between the relevant components of the middle section assembly 2 and between the components of the middle section assembly 2 and the front and rear hood assemblies 3 need to be adjusted. The engine hood 100 is specifically divided into three sections from front to rear: a front hood assembly 1, a middle section assembly 2, and a rear hood assembly 3, forming a segmented assembly engine hood 100. The front hood assembly 1 and the rear hood assembly 3 are independently mounted on the rear frame 200, the middle section frame assembly is mounted on both the front hood assembly 1 and the rear hood assembly 3, and the middle section skin assembly 23 is assembled on the middle section frame assembly. This invention achieves modular installation of the engine hood 100, resulting in high assembly efficiency; it also minimizes the dimensional chain of related components with strict clearance requirements, improving upon the aesthetic problems of uneven gaps and unreasonable surface differences that often occur in existing engine hoods.

[0067] like Figure 2 and Figure 3As shown, it should be noted that both the front frame module 11 and the rear frame module 31 are frame structures, and the overall shape is cubic. The cross-section of both the front frame module 11 and the rear frame module 31 is rectangular, with a simple and square structure, which facilitates assembly and production. The front-to-back direction is the length direction of the construction machinery, and the left-to-right direction is the width direction of the construction machinery.

[0068] like Figure 1 and Figure 4 As shown, the mid-section skin assembly 23 includes a mid-section top cover 231, side door assemblies, and mid-section skin 235. The mid-section top cover 231 is installed on the top of the mid-section frame assembly, and the front and rear ends of the mid-section top cover 231 are respectively installed on the front frame module 11 and the rear frame module 31. The mid-section frame assembly is provided with a maintenance opening, and two side door assemblies are installed opposite each other in the left-right direction at the maintenance opening. The side door assemblies are used to open or close the maintenance opening. The two mid-section skins 235 are arranged opposite each other in the left-right direction, and the side door assemblies are located between the mid-section skin 235 and the mid-section top cover 231 in the up-down direction.

[0069] In this embodiment, the mid-section skin assembly 23 includes a central top cover 231, a side door assembly, and a mid-section skin 235 arranged sequentially from top to bottom. The segmented design of installing the side door assembly at the maintenance opening facilitates the maintenance and upkeep of components inside the engine hood 100. Furthermore, the front and rear ends of the central top cover 231 are respectively installed on the front frame module 11 and the rear frame module 31, which can enhance the structural strength of the engine hood 100. In this embodiment, the front hood assembly 1, the rear hood assembly 3, and the mid-section frame assembly can all be connected to the side door assembly, further improving the structural strength of the engine hood 100.

[0070] In one embodiment, the mid-section frame assembly includes two mid-frames 21 arranged opposite each other in the left-right direction. Each mid-frame 21 includes a vertical plate 212 and two horizontal plates 211 spaced apart in the up-down direction. The upper and lower ends of the vertical plate 212 are respectively installed on the two horizontal plates, and the front and rear ends of the horizontal plates are respectively installed on the front frame module 11 and the rear frame module 31. In this embodiment, the mid-frame 21 is I-shaped, including two horizontal plates 211 and one vertical plate 212, which has a simple structure and is easy to assemble.

[0071] like Figure 4As shown, the mid-section frame assembly also includes a transition bracket 22 for connecting the rear frame 200 and the mid-skin 235. The two horizontal plates are an upper horizontal plate and a lower horizontal plate. The mid-section top cover 231 is mounted on the upper horizontal plate, and the side door latch of the side door assembly is mounted on the vertical plate 212. The upper and lower ends of the mid-skin 235 are respectively mounted on the lower horizontal plate and the transition bracket 22. In this embodiment, the transition bracket 22 is L-shaped, allowing the mid-skin 235 to be mounted on the rear frame 200. In this embodiment, the mid-section top cover 231, the side door assembly, and the mid-skin 235 are all mounted on the same mid-frame 21, avoiding uneven gaps caused by assembling the mid-section top cover 231, side door assembly, and mid-skin 235 on different frames.

[0072] Specifically, the side door assembly includes a small side door 234 and a large side door 233 independently arranged in the front-rear direction. The length of the large side door 233 is greater than the length of the small side door 234. The large side door 233 is installed on the rear frame module 31, and the small side door 234 is installed on the front frame module 11. The lower edges of both the large and small side doors 233 and 234 abut against the middle skin 235. In this embodiment, the small side door 234 is located in front of the large side door 233. The two side door assemblies in this embodiment are arranged opposite each other in the left-right direction, and each side door assembly includes a large side door 233 and a small side door 234, so that the engine hood 100 forms a four-door structure. This facilitates maintenance and also avoids the situation of poor structural strength due to excessively large side doors by using the matching of large and small doors. In this embodiment, the upper edge of the middle skin 235 matches the lower edge of the side door assembly. Using the same middle skin 235 to match both the large and small side doors 233 and 234 simultaneously facilitates the control of surface differences and gaps, and improves the accuracy of surface differences and gaps.

[0073] It should be noted that the left and right sides of the central top cover 231 are provided with top cover folded edges 232 for covering assembly gaps; and the upper edge of the middle skin 235 is provided with a skin folded edge for covering assembly gaps. In this embodiment, both the left and right sides of the central top cover 231 are provided with top cover folded edges 232. After the central top cover 231 is installed, the side door assembly is formed. The side door assembly can cover the top cover folded edges 232, and the skin folded edges completely cover the upper edge of the middle skin 235. After the side door assembly is installed, the middle skin 235 is assembled. The middle skin 235 can cover the skin folded edges, which can improve the aesthetics of the engine hood.

[0074] like Figure 2 and Figure 3As shown, the front skin assembly 12 includes a front top cover 121, two upper side panels 122, and two lower side panels 123 located below the upper side panels 122. The front top cover 121 is mounted on the top of the front frame module 11, the two upper side panels 122 are mounted on the sides of the front frame module 11 in the left-right direction, and the two lower side panels 123 are mounted on the sides of the front frame module 11 in the left-right direction. It should be noted that the front top cover 121, the two upper side panels 122, and the two lower side panels 123 are all rectangular plates, and the upper and lower segmented design facilitates disassembly and meets the maintenance requirements of the covered components. In this embodiment, the front top cover 121, the two upper side plates 122, and the two lower side plates 123 are all installed on the front frame module 11. The front top cover 121 adopts a single plate design, and the sides adopt an upper and lower block plate structure. Side reinforcing crossbeams are provided on the sides of the front frame module 11, providing an installation point for each of the upper side plates 122 and lower side plates 123. This ensures the structural strength of the front cover assembly 1 and allows for the upper and lower block disassembly of the sides of the front cover assembly 1, facilitating subsequent maintenance. All components of the front cover assembly 1 can be pre-assembled offline. After adjusting the gaps and surface differences between adjacent components, the entire assembly is hoisted onto the rear frame 200 of the construction machinery. This eliminates the need to assemble each component individually onto the construction machinery, and the gap and surface difference adjustment can be completed offline, reducing the time spent working at height and improving assembly efficiency.

[0075] Furthermore, the rear skin assembly 32 includes a rear top cover 321, a rear top window, a rear door 322, two rear side skin welded joints 323, and two rear side windows 324. The rear top cover 321 can be welded to the top of the rear frame module 31, the rear door 322 is installed on the rear side of the rear frame module 31, and the two rear side skin welded joints 323 are installed on the sides of the rear frame module 31 in the left-right direction. The rear side skin welded joints 323 are provided with windows, and the rear side windows 324 are installed at the windows and used to open or close the windows. In this embodiment, the rear top cover 321, the rear door 322, the two rear side skin welded joints 323, and the two rear side windows 324 are all rectangular plates, and the rear door 322 and the rear side windows 324 are both perforated plates with multiple heat dissipation holes. All components of the rear cover assembly 3 can be pre-assembled offline. After adjusting the gaps and surface differences between adjacent parts, the entire assembly is hoisted onto the rear frame 200 of the construction machinery. There is no need to assemble each part onto the construction machinery one by one. Moreover, the gap and surface difference adjustment can be completed offline, reducing the time spent working at height and improving assembly efficiency.

[0076] The present invention also proposes an engine hood assembly method, applied to the engine hood 100 as described above, the engine hood assembly method comprising:

[0077] The front frame module 11 and the front skin assembly 12 are pre-installed as the front cover assembly 1, and the rear frame module 31 and the rear skin assembly 32 are pre-installed as the rear cover assembly 3.

[0078] The front cover assembly 1 and the rear cover assembly 3 are assembled onto the rear frame 200;

[0079] Pre-tighten the middle section frame assembly using connectors;

[0080] The hoisted front cover assembly 1 and rear cover assembly 3 are pre-installed to obtain a rough assembly of the machine cover;

[0081] The middle section skin assembly 23 is assembled onto the rough assembly hood;

[0082] Tighten the connectors.

[0083] In this embodiment, the engine hood 100 adopts a pre-assembly method with the front hood assembly 1 and the rear hood assembly 3. All components of the front hood assembly 1 and the rear hood assembly 3 can be pre-assembled offline. After adjusting the gaps and surface differences between adjacent components, the entire assembly is hoisted onto the rear frame 200 of the construction machinery. This eliminates the need to assemble each component individually onto the construction machinery, and the gap and surface difference adjustment can be completed offline, reducing the time spent working at height and improving assembly efficiency. Furthermore, by pre-tightening the mid-section frame assembly and the mid-section skin assembly 23 to obtain a rough assembly of the engine hood, the gaps and surface differences of the mid-section components can be adjusted, thereby improving the accuracy of gap and surface difference adjustment.

[0084] In this embodiment of the invention, pre-tightening the mid-section skeleton assembly and the mid-section skin assembly 23 includes:

[0085] The middle top cover 231 is installed on the middle frame assembly, and the front and rear ends of the middle top cover 231 are respectively installed on the front frame module 11 and the rear frame module 31.

[0086] The side door assembly is installed between the front frame module 11 and the rear frame module 31, so that the two side door assemblies are installed outside the middle top cover 231 in the left and right directions.

[0087] The middle skin 235 is installed on the middle frame assembly.

[0088] In this embodiment, a front bracket 111, a front threaded seat 112, and a front support 113 are provided on both the left and right sides of the rear end of the front frame module 11. Multiple first top brackets 114 are provided at intervals along the left-right direction at the top of the rear end of the front frame module 11. The front bracket 111 extends rearward and has a mounting surface on its top. The front support 113 is located on the top of the front frame module 11 and extends rearward, with a mounting surface on its top. The front threaded seat 112 is located vertically between the front bracket 111 and the front support 113. A rear bracket 311, a rear threaded seat 312, a rear support 313, and a second top bracket 314 are provided on both the left and right sides of the front end of the rear frame module 31. The rear bracket 311 extends forward and has a mounting surface on its top. The rear support 313 and the second top bracket 314 are located on the top of the rear frame module 31.

[0089] Specifically, the two horizontal plates 211 and vertical plates 212 of the middle frame assembly can be pre-assembled into a middle frame 21 as a small assembly. The middle frame assembly is then hoisted as a whole to the front cover assembly 1 and the rear cover assembly 3. The front end of the upper horizontal plate is fixed to the front support 113, and the upper horizontal plate is fixed to the rear support 313. The front end of the lower horizontal plate is fixed to the front bracket 111, and the rear end of the lower horizontal plate is fixed to the rear bracket 311. All of the above installations are done using rough assembly, and only pre-tightening is performed at this time.

[0090] The front and rear ends of the middle top cover 231 are fixed to the first top bracket 114 and the second top bracket 314 respectively, and the left and right ends of the middle top cover 231 are respectively installed on the two upper horizontal plates.

[0091] The small side door 234 is pre-installed on the front threaded seat 112, and the large side door 233 is pre-installed on the rear threaded seat 312;

[0092] The transition bracket 22 is pre-installed on the rear frame 200, and the upper end of the middle skin 235 is assembled to the lower cross plate, and the lower end is assembled to the transition bracket 22.

[0093] Specifically, bolts can be used as connectors to pre-assemble the middle frame assembly. After only pre-tightening the connecting bolts, the entire assembly is hoisted to the front cover assembly 1 and the rear cover assembly 3 for pre-installation (the bolts are only pre-tightened).

[0094] The middle top cover 231 is installed on the middle frame assembly, the front frame module 11, and the rear frame module 31, so that the gap between the middle top cover 231 and the front top cover 121 and the rear top cover 321 is uniform and the surface difference is reasonable.

[0095] The side door assembly is installed on the front frame module and the rear frame module so that the gap between the side door assembly and the front skin assembly 12, the rear skin assembly 32, and the middle top cover 231 is uniform and the surface difference is reasonable when the side door assembly is closed.

[0096] Install the middle skin 235 on the middle frame assembly and transition bracket 22, and adjust the gap between the middle skin 235 and the adjacent parts to be uniform and the surface difference to be reasonable.

[0097] Finally, tighten the mounting bolts of the mid-section frame assembly.

[0098] In this embodiment, the various components of the middle frame assembly are pre-assembled first, which facilitates the subsequent assembly of the middle skin assembly 23. The middle top cover 231 is assembled first, followed by the side door assemblies on the left and right sides of the middle top cover 231, and finally the middle skin 235 below the side door assembly is assembled. This forms an installation method from the inside out and from top to bottom, which facilitates the covering and installation of external components, avoids mutual interference between components, and facilitates subsequent adjustment of gaps and surface differences.

[0099] This invention also proposes an engineering machinery, which includes the engine hood 100 as described above. The specific structure of the engine hood 100 is as described in the above embodiments. Since the engineering machinery adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here. In one embodiment, the engineering machinery can be applied to small and medium-sized loaders and large loaders. The engineering machinery can also be applied to large hybrid loaders.

[0100] In the description of this invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0101] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0102] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0103] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. An engine hood for use in construction machinery, characterized in that, The engine hood includes: The front hood assembly (1) includes a front frame module (11) and a front skin assembly (12) mounted outside the front frame module (11). The rear cover assembly (3) is used to be installed independently of the front cover assembly (1) in the rear frame (200) of the construction machinery in the front-rear direction. The rear cover assembly (3) includes a rear frame module (31) and a rear skin assembly (32) installed outside the rear frame module (31). The mid-section assembly (2) includes a mid-section frame assembly and a mid-section skin assembly (23) installed outside the mid-section frame assembly. The front and rear ends of the mid-section frame assembly are respectively installed on the front frame module (11) and the rear frame module (31). The mid-section skin assembly (23) includes: The middle top cover (231) is installed on the top of the middle frame assembly, and the front and rear ends of the middle top cover (231) are respectively installed on the front frame module (11) and the rear frame module (31). The side door assembly has a maintenance opening in the middle frame assembly. Two side door assemblies are installed opposite each other at the maintenance opening in the left-right direction. The side door assembly is used to open or close the maintenance opening. The middle skin (235) consists of two middle skins (235) arranged opposite each other in the left-right direction, and the side door assembly is located between the middle skin (235) and the middle top cover (231) in the up-down direction; The middle frame assembly includes two middle frames (21) arranged opposite each other in the left-right direction. The middle frame (21) includes a vertical plate (212) and two horizontal plates (211) arranged at intervals in the up-down direction. The upper and lower ends of the vertical plate (212) are respectively installed on the two horizontal plates (211), and the front and rear ends of the horizontal plates (211) are respectively installed on the front frame module (11) and the rear frame module (31). The mid-section frame assembly also includes a transition bracket (22) for connecting the rear frame (200) and the middle skin (235). The side door assembly includes a small side door (234) and a large side door (233) independently arranged in the front-rear direction. The length of the large side door (233) is greater than the length of the small side door (234). The large side door (233) is installed on the rear frame module (31), and the small side door (234) is installed on the front frame module (11). The lower edges of both the large side door (233) and the small side door (234) abut against the middle skin (235).

2. The engine hood according to claim 1, characterized in that, The two horizontal plates (211) are an upper horizontal plate and a lower horizontal plate, respectively. The middle top cover (231) is installed on the upper horizontal plate, the side door latch of the side door assembly is installed on the vertical plate (212), and the upper and lower ends of the middle skin (235) are respectively installed on the lower horizontal plate and the transition bracket (22).

3. The engine hood according to claim 1, characterized in that, The left and right sides of the central top cover (231) are provided with top cover flanges (232) for covering the assembly gaps. And / or, The upper edge of the middle skin (235) is provided with a skin fold for covering the assembly gap.

4. The engine hood according to any one of claims 1 to 3, characterized in that, The front skin assembly (12) includes a front top cover (121), two upper side panels (122) and two lower side panels (123) located below the upper side panels (122). The front top cover (121) is installed on the top of the front frame module (11), the two upper side panels (122) are installed on the side of the front frame module (11) in the left-right direction, and the two lower side panels (123) are installed on the side of the front frame module (11) in the left-right direction. And / or, The rear skin assembly (32) includes a rear top cover (321), a rear top window, a rear door (322), two rear side skin welded parts (323), and two rear side windows (324). The rear top cover (321) is installed on the top of the rear frame module (31), the rear door (322) is installed on the rear side of the rear frame module (31), the two rear side skin welded parts (323) are installed on the side of the rear frame module (31) in the left-right direction, the rear side skin welded parts (323) are provided with windows, and the rear side windows (324) are installed at the windows.

5. A method for assembling an engine hood, applied to the engine hood (100) as described in any one of claims 1 to 4, characterized in that, The engine hood assembly method includes: The front frame module (11) and the front skin assembly (12) are pre-assembled as the front cover assembly (1), and the rear frame module (31) and the rear skin assembly (32) are pre-assembled as the rear cover assembly (3). The front cover assembly (1) and the rear cover assembly (3) are assembled to the rear frame (200). Pre-tighten the middle section frame assembly using connectors; The pre-tightened mid-section frame assembly is hoisted to the front cover assembly (1) and the rear cover assembly (3) for pre-installation to obtain a rough assembly machine cover; The middle section skin assembly (23) is assembled onto the rough assembly hood; Tighten the connector.

6. The engine hood assembly method according to claim 5, characterized in that, The assembly of the mid-section skin assembly (23) onto the rough assembly hood includes: The middle top cover (231) is installed on the middle frame assembly, and the front and rear ends of the middle top cover (231) are respectively installed on the front frame module (11) and the rear frame module (31). The side door assembly is installed between the front frame module (11) and the rear frame module (31), so that the two side door assemblies are installed outside the middle top cover (231) in the left-right direction; The middle skin (235) is installed on the middle frame assembly.

7. An engineering machinery, characterized in that, The construction machinery includes the engine hood (100) as described in any one of claims 1 to 4.

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