Cab assembly and construction machinery containing the cab assembly

Abstract

This utility model relates to a cab assembly suitable for mounting to the frame of construction machinery. The cab assembly includes: a cab having a front side, a rear side, a bottom side, and a top side; a front mounting portion and a rear mounting portion provided on the bottom side; a front mounting bracket; and a rear mounting bracket configured as a hollow box-shaped structure defining a top and two longitudinal sides. The rear mounting portion has a first horizontal mounting surface and a first vertical surface extending along the entire width of the cab. The first horizontal mounting surface is offset towards the top side relative to the bottom side, and the first vertical surface is offset towards the front side relative to the rear side, defining a mounting space located below and rearward of the cab, with an opening facing downward and rearward. The rear mounting bracket is at least partially located within the mounting space, and its top is fixedly connected to the first horizontal mounting surface. One of the two longitudinal sides is adjacent to and faces the first vertical surface. This utility model also provides construction machinery including the above-described cab assembly.

Description

Technical Field

[0001] This utility model relates to the field of cab structure technology for engineering machinery, and in particular to a cab assembly with an improved installation structure and engineering machinery including such a cab assembly, especially wide-body vehicles. Background Technology

[0002] Wide-body trucks are typically used in heavy-duty transportation applications such as mines and construction sites. The driver's cab, as the main working space for the operator, not only needs good sealing and comfort but also high structural strength and impact resistance. In existing technology, the cab of a wide-body truck is usually fixed to the frame via four mounting brackets, which are typically located on the same plane. While this structure meets basic installation requirements, during vehicle operation, when the cab is subjected to impacts from the front and rear (such as emergency braking, collisions, or bumps), the lack of an effective force transmission and support structure between the mounting brackets means that the stress on the cab is mainly transmitted to the main frame through bolted connections.

[0003] Because the mounting base and the cab frame do not form an integral support structure, the cab is prone to deformation or stress concentration when subjected to external forces in the front and rear directions. This affects the cab's compressive and throttling resistance, and may even lead to loosening or damage to the connection points. This not only reduces the reliability and safety of the cab structure, but also affects the driver's operational safety and passenger comfort. Utility Model Content

[0004] To overcome at least one of the aforementioned problems, an improved cab assembly is provided, which has an improved mounting structure, particularly suitable for wide-body vehicles, and can further enhance the overall compressive and throttling strength of the cab while providing a stable mounting support, thereby improving the structural stability and safety performance of the cab under complex working conditions.

[0005] Therefore, this utility model provides a cab assembly suitable for mounting to the frame of construction machinery. The cab assembly includes: a cab having a front side, a rear side, a bottom side, and a top side, and having a front mounting portion and a rear mounting portion on the bottom side; a front mounting bracket fixedly mounted on the front mounting portion; and a rear mounting bracket fixedly mounted on the rear mounting portion, the rear mounting bracket being configured as a hollow box structure defining a top and two longitudinal sides; wherein the rear mounting portion has a first horizontal mounting surface and a first vertical surface extending along the entire width of the cab, the first horizontal mounting surface being offset towards the top side relative to the bottom side, and the first vertical surface being offset towards the front side relative to the rear side, to define a mounting space (also referred to as a recessed space) located below and behind the cab, with an opening facing downwards and rearwards; and wherein the rear mounting bracket is at least partially located within the mounting space, and the top is fixedly connected to the first horizontal mounting surface, and one of the two longitudinal sides is adjacent to and faces the first vertical surface.

[0006] By configuring the rear mounting section as described above, the rear mounting bracket can form a multi-plane contact connection with the cab, thereby effectively improving the connection strength and structural stability between the cab and the frame. The rear mounting bracket is located within a recessed space, which, when the vehicle is subjected to impacts in the front or rear directions, disperses stress paths through an offset structure, effectively reducing concentrated stress at bolted connections and improving the cab's impact and vibration resistance.

[0007] According to one embodiment of this utility model, the front mounting portion has a second horizontal mounting surface and a second vertical surface extending along the entire width of the cab, wherein the second horizontal mounting surface is offset from the bottom side to the top side, and the second vertical surface is offset from the front side to the rear side; the cab also includes a front reinforcing crossbeam, which is fixedly connected to the second horizontal mounting surface and the second vertical surface, and the front mounting bracket is fixedly connected to the lower side of the front reinforcing crossbeam via a first connecting mechanism. The front reinforcing crossbeam forms a rigid frame structure at the front of the cab, making the load transfer between the front mounting bracket and the bottom of the cab more uniform, thereby improving the structural strength, impact resistance, and overall stability of the front of the cab, while also optimizing assembly and maintenance convenience.

[0008] According to a preferred embodiment of the present invention, the cab further includes a rear reinforcing crossbeam, which is fixedly connected to the first horizontal mounting surface, and the lower side of the rear reinforcing crossbeam is configured such that its lower side forms at least a portion of the first horizontal mounting surface; a rear mounting bracket is fixedly connected to the lower side of the rear reinforcing crossbeam via a second connecting mechanism, and is arranged such that the longitudinal side of the bracket, which is adjacent to and faces the first vertical surface, has a gap with the first vertical surface in the horizontal direction. The rear reinforcing crossbeam, which connects the rear mounting bracket to the bottom of the cab via its lower side, enhances the structural strength and torsional rigidity of the lower rear part of the cab, improves the load transmission path, enhances impact resistance, optimizes assembly and maintenance convenience, and makes the overall structure more compact and reliable.

[0009] In one embodiment of this invention, the first connecting mechanism may include a first connecting bolt for fixing the front mounting bracket to the lower side of the front reinforcing crossbeam; and a first shock absorber disposed between the front mounting bracket and the front reinforcing crossbeam; and the second connecting mechanism includes a second connecting bolt for fixing the rear mounting bracket to the lower side of the rear reinforcing crossbeam; and a second shock absorber disposed between the rear mounting bracket and the rear reinforcing crossbeam. The front and rear mounting brackets are fixed to the lower side of the corresponding front or rear reinforcing crossbeam by bolts, and shock absorbers are provided between the brackets and the crossbeams. This effectively absorbs and buffers vibrations and impacts while ensuring the structural strength and connection reliability of the cab, improving the cab's vibration-resistant comfort, and enhancing load distribution and the durability of the connecting parts.

[0010] In a preferred embodiment of this invention, the front reinforcing crossbeam has a first top extending along the entire width of the cab and two first legs extending downward from the first top, each of the first legs having a first threaded hole at its end suitable for receiving the first connecting bolt; the rear reinforcing crossbeam has a second top extending along the entire width of the cab and two second legs extending downward from the second top, each of the second legs having a second threaded hole at its end suitable for receiving the second connecting bolt; wherein both the front and rear reinforcing crossbeams are constructed as hollow box-shaped structures with open bottoms. The front and rear reinforcing crossbeams of this invention adopt a hollow box-shaped structure with open bottoms, and the top extending crossplates form legs downwards, with threaded holes at the end of each leg for fixing connecting brackets. This structure effectively reduces weight while ensuring load-bearing capacity and torsional stiffness, provides space for easy assembly and maintenance, and has high bolt connection reliability, thereby improving the overall structural strength, impact resistance, and assembly convenience of the cab.

[0011] According to a preferred embodiment of this utility model, the front mounting bracket is constructed as a hollow box-shaped structure, including a first top mounting plate, a first side plate, a second side plate, a first bottom plate, and multiple first stiffening plates. The top of the front mounting bracket has two spaced-apart first mounting seats, wherein the front mounting bracket is fixedly connected to the front reinforcing crossbeam through the cooperation of the first mounting seats and a first connecting mechanism. Furthermore, both the first and second side plates are provided with multiple weight-reducing holes. The weight-reducing hole design and the hollow box-shaped structure allow the front mounting bracket to significantly reduce its weight while maintaining strength, which is beneficial for overall machine quality control and fuel / energy consumption optimization. The box-shaped structure combined with the stiffening plate design improves the overall bending and torsional stiffness of the bracket, ensuring that the bracket is not easily deformed under vehicle vibration or collision loads.

[0012] According to a preferred embodiment of this utility model, the rear mounting bracket includes a second top mounting plate, a third side plate, a fourth side plate, a second bottom plate, and multiple second stiffening plates. The top of the rear mounting bracket has two spaced-apart second mounting seats and two mounting legs extending downwards from the top. The rear mounting bracket is fixedly connected to the rear reinforcing crossbeam via the second mounting seats and a second connecting mechanism, and is also fixedly connected to the vehicle frame via the mounting legs. Furthermore, both the third and fourth side plates have multiple weight-reducing holes. This structure not only improves the bending and torsional stiffness and load-bearing capacity of the rear mounting bracket, but also reduces its weight, optimizes the overall center of gravity, facilitates assembly and maintenance, and enhances the stability and impact resistance of the overall rear structure of the cab.

[0013] In one design, each mounting leg has a flange plate at its end, and each flange plate has multiple bolt connections for securing the rear mounting bracket to the vehicle frame. This configuration, by increasing the contact area between the mounting leg and the vehicle frame and using multiple bolts for fixing, improves the overall rigidity and structural strength of the connection between the rear mounting bracket and the vehicle frame, improves load distribution, enhances vibration and impact resistance, facilitates assembly and maintenance, and supports standardized modular design.

[0014] This utility model also provides an engineering machinery, which includes a frame and the aforementioned cab assembly mounted on the frame. The cab assembly of this utility model is particularly suitable for wide-body vehicles, mainly because its front and rear reinforcing crossbeams extend along the width of the cab, its hollow box-type support and bottom recessed space design, and its multi-bolt connection combination of outriggers and flange plates, forming a high-rigidity load-bearing frame at the bottom of the cab. This frame can support the large span, high weight, and operating load of the wide-body cab, while providing excellent torsional resistance, impact resistance, and vibration damping performance, ensuring the structural stability and operational comfort of the wide-body vehicle cab.

[0015] The beneficial effects of the cab assembly for engineering machinery according to this utility model are at least as follows: The cab assembly achieves a stable connection between the cab and the frame through a combination of front and rear reinforcing crossbeams, hollow box-type mounting brackets, outriggers and flange plates, multi-bolt connections, and shock absorbers. When the cab is subjected to external forces in the front and rear directions, the load can be simultaneously transferred through the reinforcing crossbeams, brackets, and bolts, enhancing the overall strength and thrust resistance of the cab, improving load distribution, and reducing the risk of bolt breakage. Simultaneously, the hollow box-type structure and weight-reducing holes reduce weight, and the shock absorbers absorb vibration, improving impact resistance and operational comfort. This cab assembly is particularly suitable for wide-body vehicles, providing high-rigidity support over large spans to ensure cab stability and safety. Attached Figure Description

[0016] The features and advantages of this utility model will become clear from the following detailed description provided with reference to the accompanying drawings. It should be understood that the following drawings are merely schematic and not necessarily drawn to scale, and therefore should not be considered as limitations on this utility model, wherein:

[0017] Figure 1 A perspective view from the rear side is shown of one embodiment of the cab assembly according to the present invention;

[0018] Figure 2 It shows Figure 1 The diagram shown is a three-dimensional view of the cab assembly from the front side.

[0019] Figure 3 for Figure 1 The side view of the cab assembly shown;

[0020] Figure 3a for Figure 3 Enlarged view of part A in the image;

[0021] Figure 4 for Figure 1 An exploded view of the cab assembly shown;

[0022] Figure 5 This is a side view of one embodiment of the driver's cab according to the present invention;

[0023] Figure 6a and Figure 6b An embodiment of the front reinforcing crossbeam according to the present invention is shown;

[0024] Figure 7a and Figure 7b An embodiment of the rear reinforcing crossbeam according to the present invention is shown;

[0025] Figure 8a and Figure 8b An embodiment of the front mounting bracket according to the present invention is shown; and

[0026] Figure 9a and Figure 9b An embodiment of the rear mounting bracket according to the present invention is shown. Detailed Implementation

[0027] Embodiments of the present invention are described below with reference to the accompanying drawings. Numerous specific details are set forth in the following description to enable those skilled in the art to more fully understand and implement the present invention. Furthermore, it should be understood that the present invention is not limited to the specific embodiments described. Rather, the present invention can be practiced with any combination of the features and elements described below, regardless of whether they relate to different embodiments. Therefore, the following aspects, features, embodiments, and advantages are for illustrative purposes only and should not be construed as elements or limitations of the claims unless expressly set forth in the claims.

[0028] The terms "first" and "second" are used below to describe the elements of this application. These terms are used only to distinguish the individual elements and not to limit the nature, order, or number of these elements. The terms "comprising" and "having" are used to indicate an open-ended inclusion and mean that there may be additional elements / components besides those listed.

[0029] In this article, "front" refers to the cab being in front of the direction of travel, "rear" refers to the cab being behind the direction of travel, and "up" and "down" respectively indicate the relative positions in the vertical direction.

[0030] exist Figure 1 and Figure 2 A perspective view of a preferred embodiment of a cab assembly 100 according to the present invention is shown, which is suitable for mounting to the chassis (not shown) of construction machinery, particularly wide-body vehicles. In this embodiment, the cab assembly 100 mainly includes a cab 1, a front mounting bracket 2, a rear mounting bracket 3, a front reinforcing crossbeam 13, a rear reinforcing crossbeam 14, and a connecting mechanism, wherein the rear mounting bracket 3 is configured as a hollow box-shaped structure and defines the top and two longitudinal sides.

[0031] See especially Figure 4 and Figure 5The cab 1 has a front side 1a, a rear side 1b, a bottom side 1c, and a top side 1d, and a front mounting portion 11 and a rear mounting portion 12 are provided on the bottom side 1c. The rear mounting portion 12 extends along the entire width of the cab to form a first horizontal mounting surface 121 and a first vertical surface 122. Specifically, the first horizontal mounting surface 121 is offset relative to the bottom side 1c towards the top side 1d, i.e., located above the bottom side of the cab 1; the first vertical surface 122 is offset relative to the rear side towards the front side, i.e., located in front of the rear side of the cab, thereby defining a mounting space located below and rearward of the cab, with an opening facing downward and rearward, which can also be referred to as a recessed space. Advantageously, the top of the rear mounting bracket 3 is fixedly connected to the first horizontal mounting surface 121 and is at least partially located within this mounting space, and one of the two longitudinal sides 30 is adjacent to and faces the first vertical surface 122. This configuration ensures that the rear mounting bracket 3 and the first vertical surface 122 are at approximately the same horizontal height. When the cab is subjected to external forces in the front-rear direction, the cab 1 comes into contact with the longitudinal side 30 of the rear mounting bracket 3. The force can be transmitted through the bolts of the mounting bracket and the connecting structure, which alleviates the risk of bolt breakage and enhances the cab's thrust resistance.

[0032] In a preferred embodiment, see again Figure 4 The front mounting portion 11 forms a second horizontal mounting surface 111 and a second vertical surface 112 along the width of the cab. The second horizontal mounting surface 111 is offset towards the top side 1d relative to the bottom side 1c, i.e., located above the bottom side of the cab; the second vertical surface 112 is offset towards the rear side relative to the front side, i.e., located behind the front side of the cab. The front mounting bracket 2 is fixedly connected to the lower side of the front reinforcing crossbeam 13 via a first connecting mechanism 4. The first connecting mechanism 4 includes a first connecting bolt 41 and a first shock absorber 42 arranged between the front mounting bracket 2 and the front reinforcing crossbeam 13, which can absorb vibration while the bolt is fixed.

[0033] See Figure 6a and Figure 6b A preferred embodiment of a front reinforcing beam 13 is shown, the front reinforcing beam 13 having an extension length consistent with the front mounting portion 11, and having a first top 131 and two first legs 132 extending downward from the top, each leg end having a threaded hole 133 adapted to receive a first connecting bolt 41. During installation, the front reinforcing beam 13 is connected, for example by welding and bolting, to a recessed space defined by the front mounting portion 11, wherein the first top 131 of the front reinforcing beam is connected to a second horizontal mounting plane 111, and one of its sides is connected to a second vertical plane 112.

[0034] See Figure 8a and Figure 8bThe front mounting bracket 2 includes a first top mounting plate 21, a first side plate 22a, a second side plate 22b, a first bottom plate 23, and a plurality of first stiffening plates 24, which are connected to each other by welding and threaded connections to form a hollow box-shaped structure. The top formed by the first top mounting plate 21 has two spaced-apart first mounting seats 25 with mounting holes 250. The front mounting bracket 2 is fixedly connected to the front reinforcing beam 13 via the first mounting seats 25 and the first connecting mechanism 4 (first connecting bolt 41 and first shock absorber 42) and the threaded holes 133 of the front reinforcing beam. Advantageously, the first side plate 22a and the second side plate 22b have a plurality of weight-reducing holes to reduce weight while maintaining strength. The distance between the two first mounting seats 25 is the same as the distance between the two threaded holes of the front reinforcing beam 13, which are located at its longitudinal ends.

[0035] In a preferred embodiment of this utility model, see [reference needed]. Figure 7a and Figure 7b The cab 1 also includes a rear reinforcing crossbeam 14, which extends along the entire width of the cab and has a second top 141 and two downwardly extending second outriggers 142. Each outrigger end has a second threaded hole 143. The rear reinforcing crossbeam 14 is also constructed as a hollow box-shaped structure with an open bottom. See also Figure 5 On the rear side of the first horizontal mounting surface 121, a recess extending along the entire width of the cab is provided. The lower and rear sides of this recess are open to define a receiving space for the rear reinforcing crossbeam 14. The rear reinforcing crossbeam 14 is fixedly connected to this receiving space, for example, by welding. The rear reinforcing crossbeam 14 is configured such that its lower side forms part of the first horizontal mounting surface 121. The rear mounting bracket 3 is fixedly connected to the two second legs of the rear reinforcing crossbeam by a second connecting mechanism 5, and leaves a gap S in the horizontal direction between it and the first vertical surface 122 (see [reference]). Figure 3a The rear connection mechanism 5 includes a second connecting bolt 51 and a second shock absorber 52 arranged between the rear mounting bracket 3 and the rear reinforcing crossbeam 14, which can absorb rear load impacts and improve cab stability. Through this connection structure, vibration transmission can be significantly reduced while maintaining connection rigidity, thereby improving the fatigue life of the connection between the cab and the frame.

[0036] See Figure 9a and Figure 9bIn a preferred embodiment, the rear mounting bracket 3 is formed by welding and bolting together a second top mounting plate 31, a third side plate 32a, a fourth side plate 32b, a second bottom plate 33, and a plurality of second stiffening plates 34. The top formed by the second top mounting plate 31 has two spaced-apart second mounting seats 35 and two mounting legs 36 extending downward from the top. The distance between the two second mounting seats 35 is the same as the distance between the two threaded holes of the rear reinforcing crossbeam 14. The rear mounting bracket 14 is fixedly connected to the rear reinforcing crossbeam 14 by the engagement of the second mounting seats 35 with the threaded holes 143 on the second connecting mechanism 5, and can be fixedly connected to the frame via the mounting legs 36. Advantageously, the ends of the mounting legs 36 are provided with flange plates 361, each flange plate having a plurality of bolts 362 for securely fixing the rear mounting bracket to the frame. Both the third side plate 32a and the fourth side plate 32b have weight-reduction holes to further reduce weight and optimize stress distribution.

[0037] However, it should be understood that the front and rear reinforcing crossbeams may also adopt different cross-sectional shapes, such as box-shaped, I-shaped, or closed cross-sections, to balance strength, weight, and space constraints. This is also covered within the scope of this application.

[0038] In the above embodiments, considering that the front of the cab is subjected to greater impact during driving and braking, the cross-sectional dimension of the front mounting bracket 13 is designed to be larger than that of the rear mounting bracket 14 in order to achieve reasonable load distribution and structural reinforcement.

[0039] In the above embodiment, the front and rear reinforcing crossbeams are combined with the hollow box-type mounting brackets, and the load is reliably transferred to the frame through outriggers, flange plates, and multiple bolt connections, mitigating the risk of bolt breakage. The hollow box-type structure, combined with stiffening plates and weight-reducing holes, achieves lightweighting while maintaining high rigidity, enhancing bending and torsional resistance. The front and rear reinforcing crossbeams extend along the width of the cab, and the brackets and crossbeams form a high-rigidity load-bearing frame, which can support the wide-body cab under large spans, improving stability and safety.

[0040] In this utility model, an engineering machine is also provided, which includes the above-mentioned cab assembly. The engineering machine is, for example, a wide-body vehicle, including but not limited to mining dump trucks, engineering dump trucks, etc.

[0041] Industrial applicability

[0042] The cab assembly of this invention can be widely used in various types of engineering machinery, such as mining dump trucks and engineering dump trucks. Through the synergistic effect of the front and rear mounting brackets, the reinforcing crossbeams, and the connecting mechanism, the connection between the cab and the frame is made more stable and reliable, effectively withstanding impact loads from the front, rear, and vertical directions, and significantly improving the overall strength and stability of the cab assembly.

[0043] The shock absorber structure is set in the connection mechanism, which can effectively absorb vibration and impact, improve the driver's operating comfort and safety, and is especially suitable for wide-body construction machinery under high-intensity working conditions.

[0044] The front and rear mounting brackets and reinforcing crossbeams all adopt a hollow box-type structure with stiffening plates and weight-reducing holes, ensuring load-bearing capacity while achieving lightweight design, thus reducing overall energy consumption and manufacturing costs. Furthermore, through flange connection structures and standardized installation space design, the cab assembly can be quickly assembled and disassembled on different models of construction machinery, improving maintenance efficiency and production adaptability.

[0045] In summary, this utility model has the advantages of high structural strength, excellent vibration resistance, economical manufacturing, and convenient installation and maintenance, and has significant industrial application value.

[0046] Various modifications and variations can be made to the embodiments disclosed above without departing from the scope or spirit of this invention. Other embodiments of this invention will be apparent to those skilled in the art based on the practice of this invention disclosed in this specification. This specification and the examples disclosed herein should be considered illustrative only, and the true scope of this invention is defined by the appended claims and their equivalents.

Claims

1. A cab assembly suitable for mounting to the frame of construction machinery, characterized in that, The cab assembly (100) includes: The cab (1) has a front side (1a), a rear side (1b), a bottom side (1c) and a top side (1d), and a front mounting part (11) and a rear mounting part (12) are provided on the bottom side (1c); A front mounting bracket (2) fixedly installed at the front mounting portion (11); and A rear mounting bracket (3) is fixedly installed at the rear mounting part (12). The rear mounting bracket (3) is constructed as a hollow box-shaped structure and defines the top and two longitudinal sides. The rear mounting portion (12) has a first horizontal mounting surface (121) and a first vertical surface (122) extending along the entire width of the cab. The first horizontal mounting surface (121) is offset relative to the bottom side (1c) towards the top side (1d), and the first vertical surface (122) is offset relative to the rear side towards the front side, defining a mounting space located below and behind the cab, with a downward and rearward opening. The rear mounting bracket (3) is at least partially located within the mounting space, and the top is fixedly connected to the first horizontal mounting surface (121), with one of the two longitudinal sides adjacent to and facing the first vertical surface.

2. The cab assembly according to claim 1, characterized in that, The front mounting portion (11) has a second horizontal mounting surface (111) and a second vertical surface (112) extending along the entire width of the cab, wherein the second horizontal mounting surface (111) is offset toward the top side (1d) relative to the bottom side (1c), and the second vertical surface (112) is offset toward the rear side relative to the front side. and The cab also includes a front reinforcing crossbeam (13), which is fixedly connected to the second horizontal mounting surface (111) and the second vertical surface (112), and the front mounting bracket (2) is fixedly connected to the lower side of the front reinforcing crossbeam (13) through a first connecting mechanism (4).

3. The cab assembly according to claim 2, characterized in that, The cab also includes a rear reinforcing crossbeam (14) fixedly connected to the first horizontal mounting surface (121), and the rear reinforcing crossbeam is configured such that its lower side forms at least a portion of the first horizontal mounting surface (121). The rear mounting bracket (3) is fixedly connected to the lower side of the rear reinforcing beam (14) by the second connecting mechanism (5), and is arranged so that the longitudinal side facing the first vertical plane has a gap (S) between it and the first vertical plane (122) in the horizontal direction.

4. The cab assembly according to claim 3, characterized in that, The first connecting mechanism (4) includes: The first connecting bolt (41) is used to fix the front mounting bracket (2) to the lower side of the front reinforcing crossbeam (13); and A first shock absorber (42) is arranged between the front mounting bracket (2) and the front reinforcing crossbeam (13); and The second connecting mechanism (5) includes: The second connecting bolt (51) is used to fix the rear mounting bracket (3) to the lower side of the rear reinforcing crossbeam (14); and A second shock absorber (52) is arranged between the rear mounting bracket (3) and the rear reinforcing crossbeam (14).

5. The cab assembly according to claim 4, characterized in that, The front reinforcing crossbeam (13) has a first top (131) extending along the entire width of the cab and two first legs (132) extending downward from the first top, each of the first legs having a first threaded hole (133) at its end suitable for receiving the first connecting bolt (41). The rear reinforcing crossbeam (14) has a second top (141) extending along the entire width of the cab and two second legs (142) extending downward from the second top, each of the second legs having a second threaded hole (143) at its end suitable for receiving the second connecting bolt (51). The front reinforcing beam (13) and the rear reinforcing beam (14) are both constructed as hollow box-shaped structures with open bottoms.

6. The cab assembly according to any one of claims 2 to 5, characterized in that, The front mounting bracket (2) is constructed as a hollow box-shaped structure and includes a first top mounting plate (21), a first side plate (22a), a second side plate (22b), a first bottom plate (23), and a plurality of first stiffening plates (24); The top of the front mounting bracket (2) is provided with two spaced-apart first mounting seats (25), wherein the front mounting bracket (2) is fixedly connected to the front reinforcing crossbeam (13) through the cooperation of the first mounting seats (25) and the first connecting mechanism (4); and Both the first side plate (22a) and the second side plate (22b) are provided with multiple weight-reducing holes.

7. The cab assembly according to any one of claims 3 to 5, characterized in that, The rear mounting bracket (3) includes a second top mounting plate (31), a third side plate (32a), a fourth side plate (32b), a second bottom plate (33), and a plurality of second stiffening plates (34); The rear mounting bracket (3) has two spaced-apart second mounting seats (35) at its top and two mounting legs (36) extending downward from the top. The rear mounting bracket (3) is fixedly connected to the rear reinforcing crossbeam (14) through the cooperation of the second mounting seats (35) and the second connecting mechanism (5), and is fixedly connected to the vehicle frame through the mounting legs (36). Both the third side plate (32a) and the fourth side plate (32b) are provided with multiple weight-reducing holes.

8. The cab assembly according to claim 7, characterized in that, Each of the mounting legs (36) has a flange plate (361) at its end, and each flange plate has a plurality of bolts (362) for fixing the rear mounting bracket (3) to the frame.

9. An engineering machinery, characterized in that, The construction machinery includes a chassis and a cab assembly (100) mounted on the chassis according to any one of claims 1 to 8.

10. The engineering machinery according to claim 9, characterized in that, The construction machinery in question is a wide-body vehicle.

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