Front suspension system of heavy truck cab

Abstract

The application discloses a front suspension system of a heavy truck cab and relates to the technical field of suspension systems.The front suspension system comprises a connecting rod and front suspensions arranged at the two ends of the connecting rod, wherein the front suspensions comprise a frame connecting frame, a swing arm adapter frame, a swing arm body, a cab connecting frame and a shock absorber, and the frame connecting frame comprises an installation seat in an inverted L-shaped structure.The application realizes systematic functional integration and structural optimization on the frame connecting frame, the swing arm adapter frame, the swing arm body and the cab connecting frame.In terms of functional integration, the functions of frame connection, swing arm support, limiting, shock absorber connection, height valve installation, cab connection and swing arm hinging are realized in a concentrated manner, so that the overall weight of the system is reduced.In terms of structural strength and light weight, the components are provided with optimized cross-sectional shapes, reinforcing rib layouts and weight-reducing hole distributions, so that the overall structural rigidity and strength are ensured, and remarkable system weight-reducing effects are achieved.

Description

Technical Field

[0001] This invention belongs to the field of suspension system technology, and in particular relates to a front suspension system for a heavy truck cab. Background Technology

[0002] The front suspension system of a heavy-duty truck cab is a key component connecting the cab and the chassis. Its main functions include supporting the cab, damping vibrations and impacts from the road surface, enabling the cab to tilt, and ensuring the stability and ride comfort of the cab during driving. As heavy-duty trucks develop towards lightweight, high comfort, and high reliability, higher requirements are placed on the structural design of the front suspension system.

[0003] However, the existing technology still has the following technical problems: 1. It is difficult to balance structural strength and lightweight: The frame connection brackets of the existing front suspension system are mostly simple castings or sheet metal parts. In order to ensure sufficient structural strength, it is often necessary to increase the material thickness or add additional reinforcing ribs, resulting in increased weight. Although some solutions have weight reduction holes, they are mostly simple open hole structures, which make it difficult to ensure the stiffness requirements of high stress areas while achieving lightweight.

[0004] 2. Low functional integration: In the existing technology, the suspension has functional connection points such as frame connection, limit, shock absorber connection, swing arm support, height valve installation, cab connection, and swing arm hinge. The system has many connection points, many installation points, many clearance points, many parts, complex assembly layers, large cumulative tolerances, and it is difficult to effectively control the overall weight of the system.

[0005] 3. Insufficient linkage between left and right suspensions: Although some existing solutions have lateral stabilizer bars or anti-torsion beams to enhance torsional resistance, the stabilizer bars are usually installed between the tilting supports or brackets and are not directly related to the movement of the swing arms. The effect of controlling the synchronization of the left and right swing arm movements is limited, and the cab may still tilt or skew under complex working conditions, indicating insufficient linkage. Summary of the Invention

[0006] The purpose of this invention is to provide a front suspension system for a heavy-duty truck cab. Through systematic functional integration and structural optimization of the frame connecting frame, swing arm adapter frame, swing arm body, and cab connecting frame, multiple functions such as frame connection, swing arm support, limiters, shock absorber connection, height valve installation, cab connection, and swing arm hinge are integrated, reducing the overall system weight. Regarding structural strength and lightweighting, each component achieves significant system weight reduction while ensuring overall structural rigidity and strength through optimized cross-sectional shapes, reinforcing rib layouts, and weight-reducing port distribution.

[0007] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution: This invention relates to a front suspension system for a heavy-duty truck cab, comprising a connecting rod and a front suspension mounted at both ends of the connecting rod. The front suspension includes a frame connecting frame, a swing arm adapter, a swing arm body, a cab connecting frame, and a shock absorber. The frame connecting frame includes an inverted L-shaped mounting base. Both sides of the outer side of the mounting base are provided with side plates with an outer arc surface and a triangular structure. The top and bottom of the two side plates are respectively provided with a top edge and a bottom horizontal rib. A limit block is fixed on the top surface of the top edge. A lower pin is provided on the outer side between the two side plates. The frame connecting frame is provided with several first weight reduction ports. The swing arm adapter includes a vertical plate-shaped main body. The inner and outer sides of the main body are integrally provided with mesh ribs. The inner side of the main body is integrally provided with an upper horizontal edge. The upper horizontal edge and the main body below it form a frame mounting position. A U-shaped cover is fixed to the rear side of the top area of ​​the main body. The open side of the cover faces forward and the top of the cover is provided with a swing arm mounting position. The tail end of the swing arm body is hinged to the swing arm mounting position. The front end of the swing arm body is provided with a horizontal interface. The top surface of the front end of the swing arm body is integrally provided with an upwardly extending support arm. The top end of the support arm is provided with an upper sleeve. The bottom of the front end of the support arm is provided with a limiting ear that cooperates with the limiting block. The two ends of the connecting rod are installed in the horizontal interfaces of the two swing arms; The cab connecting frame includes a horizontal plate portion, the front end of which is integrally provided with a downwardly inclined extension portion, and the top edges of the extension portion are provided with side portions with the top edges flush with the horizontal plate portion on both sides. A vertical side portion is provided above the front side between the two side portions. The vertical side portion, the horizontal plate portion, and the top edges of the side portions together constitute the cab connecting position. A fixing pin is provided at the front end between the two side portions, which is hinged to the upper sleeve of the swing arm body. The cab connecting frame is provided with several third weight reduction ports. The cab connecting frame is provided with an outer support arm with a T-shaped cross section. The bottom end of the outer support arm is provided with an upper pin shaft through a hinge seat. The top and bottom ends of the shock absorber are respectively hinged to the upper pin shaft and the lower pin shaft.

[0008] Furthermore, the bottom transverse rib has an inner arc edge with a concave structure at one end near the lower pin shaft. The inner arc edge forms two parallel support ears on the outer sides of the two side plates, and the lower pin shaft is installed between the two support ears.

[0009] Furthermore, several of the first weight-reducing openings include a triangular structure hole provided on the side plate, a hole provided on the bottom horizontal rib, and a hole provided in the vertical plate area of ​​the mounting base.

[0010] Furthermore, the main body is divided into an upper section, a middle section, and a lower section with decreasing thickness from top to bottom. The cover is installed in the upper section, and the upper horizontal edge is integrally set in the middle section.

[0011] Furthermore, the swing arm body has an I-shaped cross section and is provided with several second weight reduction openings. The connection between the support arm and the swing arm body is provided with connecting ribs. The outer side of the swing arm body is integrally provided with a fixing opening. The tail end of the swing arm body is integrally provided with a rear sleeve. The rear sleeve is hinged at the swing arm mounting position and its two ends are respectively attached to the two sides inside the cover.

[0012] Furthermore, a height valve is fixed to the front side of the upper section of the two main bodies by a bracket, and the detection end of the height valve is connected to the fixing port on the outside of the swing arm.

[0013] Furthermore, at least one lug end is integrally provided at both corners of the horizontal side of the mounting base, both sides of the vertical side of the mounting base, both corners of the upper horizontal side, both sides of the lower section of the main body, the four corners of the horizontal plate, and the two corners of the top of the vertical side.

[0014] Furthermore, a slanted rib is integrally provided between the rear side of the vertical side and the extension, and a plurality of the third weight-reducing ports include holes on the slanted rib and holes on the horizontal plate. The front end of the extension is provided with a concave inner clearance port that cooperates with the upper sleeve.

[0015] Furthermore, cylindrical portions are provided at the connection points between the inclined rib portion and the two side portions, and threaded openings are provided on the cylindrical portions. The fixing pin is installed on the two cylindrical portions through fasteners and threaded openings.

[0016] Furthermore, a bearing is installed on the fixing pin, the upper sleeve is installed on the outer ring of the bearing, and both ends of the fixing pin are provided with waist-shaped cross-section connecting sections. The connecting sections are provided with through holes, and the fastener passes through the through holes and is threadedly installed at the threaded opening of the cylindrical part.

[0017] The present invention has the following beneficial effects: This invention systematically integrates and optimizes the functions and structure of the frame connecting frame, swing arm adapter frame, swing arm body, and cab connecting frame. In terms of functional integration, multiple functions such as frame connection, swing arm support, limit, shock absorber connection, height valve installation, cab connection, and swing arm hinge are realized through three core components, which significantly reduces the number of connection points, installation points, and clearance points, simplifies the assembly process, and reduces the overall weight of the system. In terms of structural strength and lightweighting, each component achieves a significant system weight reduction effect while ensuring the overall structural rigidity and strength through optimized cross-sectional shapes, stiffener layout, and weight reduction port distribution.

[0018] This invention optimizes the structure of the frame connecting frame. The frame connecting frame adopts an inverted L-shaped mounting base combined with a side plate. This structure, together with the vertical and horizontal sides of the mounting base, forms a stable triangular support system. Utilizing the geometric stability principle of triangles, the stress distribution is uniform when bearing loads from the shock absorber and swing arm, effectively avoiding stress concentration. It also integrates three major functions: frame fixing, swing arm limiting, and shock absorber lower end connection.

[0019] This invention optimizes the structure of the swing arm adapter frame by integrating a grid rib on both the inner and outer sides of the main body. The grid rib structure increases the moment of inertia of the cross section and improves bending and torsional stiffness while the increase in material is limited, achieving a high stiffness-to-weight ratio. At the same time, the thickness of the main body is divided into three zones with decreasing thickness from top to bottom. The thickness is designed differently according to the stress requirements of each zone to avoid material waste. The upper zone bears the load of the cover and swing arm and has the largest thickness, while the lower zone mainly serves as a connection and has the smallest thickness. The structure is reasonable and achieves differentiated stress design. It also integrates the functions of frame mounting, swing arm support, and height valve mounting, eliminating the need for separate swing arm end brackets and height valve brackets.

[0020] This invention optimizes the structure of the swing arm body, which has an I-shaped cross-section. This cross-section shape achieves the maximum section modulus with the least amount of material, resulting in excellent bending and torsional stiffness. The swing arm body is provided with several second weight-reducing openings to further reduce weight. Connecting ribs are provided at the connection between the support arm and the swing arm body to locally strengthen key stress areas, thus achieving both overall lightweighting and local high strength.

[0021] This invention optimizes the structure of the cab connecting frame by integrating a diagonal rib between the rear side of the vertical side and the extension. The diagonal rib connects to the two side sides on both sides to form a triangular reinforcement structure, which improves the rigidity of the cab connection. Both the diagonal rib and the horizontal plate are provided with a third weight reduction port, which achieves lightweighting while ensuring connection strength. At the same time, it integrates cab installation, hinge connection with the swing arm, connection with the shock absorber, and auxiliary fixation with the frame. The structure is compact and the force transmission path is short.

[0022] This invention utilizes a connecting rod design, with its two ends installed in the transverse interfaces at the front ends of the left and right swing arms, directly connecting the front ends of the left and right swing arms. This direct linkage response effectively suppresses cab tilt and skewing. Compared with the existing anti-torsion beam solution installed between the tilting brackets, this structure is directly related to the movement of the swing arms, resulting in better synchronous control of the swing arm movement.

[0023] This invention achieves detachable fixing of the cover and the main body through fasteners, which facilitates the installation and disassembly of the swing arm. The fixing pin is installed at the threaded opening of the cylindrical part by fasteners, and the bearing is sleeved on the fixing pin. The upper sleeve of the swing arm is installed on the outer ring of the bearing, which not only ensures the hinge accuracy, but also facilitates disassembly and maintenance. Fasteners are used to connect the various components, resulting in a high degree of modularity, which is beneficial for production assembly and after-sales maintenance.

[0024] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the front suspension system of a heavy truck cab according to the present invention; Figure 2 This is a schematic diagram of the front suspension structure; Figure 3 This is a structural schematic diagram of the frame connecting bracket; Figure 4 This is a structural diagram of the swing arm adapter and height valve; Figure 5 This is a schematic diagram of the swing arm structure; Figure 6 This is a structural schematic diagram of the cab connecting frame; The attached diagram lists the components represented by each number as follows: 1-Connecting rod, 2-Front suspension, 3-Frame connecting frame, 4-Swing arm adapter frame, 5-Swing arm body, 6-Cab connecting frame, 7-Shock absorber, 8-Height valve, 301-Mounting seat, 302-Side plate, 303-Top edge, 304-Bottom transverse rib, 305-Limiting block, 306-Lower pin, 307-First weight reduction port, 308-Inner arc edge, 309-Support lug, 401-Main body, 402-Mesh rib, 403-Upper transverse edge, 404-Cover, 405-Swing arm mounting position, 50 1-Horizontal interface, 502-Support arm, 503-Upper sleeve, 504-Limiting ear, 505-Second weight reduction port, 506-Connecting rib, 507-Fixing port, 508-Rear sleeve, 601-Horizontal plate part, 602-Extension part, 603-Side part, 604-Vertical part, 605-Fixing pin, 606-Hinge, 607-Outer support arm, 608-Upper pin shaft, 609-Diagonal rib part, 610-Third weight reduction port, 611-Inner clearance port, 612-Cylindrical part, 613-Connecting section. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] Please see Figure 1-6 As shown, the present invention is a front suspension system for a heavy truck cab, including a connecting rod 1 and a front suspension 2 disposed at both ends of the connecting rod 1. The front suspension 2 includes a frame connecting frame 3, a swing arm adapter frame 4, a swing arm body 5, a cab connecting frame 6, and a shock absorber 7. The frame connecting frame 3 includes an inverted L-shaped mounting base 301. Both sides of the outer side of the mounting base 301 are provided with side plates 302 with an outer arc surface and a triangular structure. The top and bottom of the two side plates 302 are respectively provided with a top edge 303 and a bottom cross rib 304. A limit block 305 is fixed on the top surface of the top edge 303. A lower pin 306 is provided on the outer side between the two side plates 302. The frame connecting frame 3 is provided with a number of first weight reduction ports 307. The swing arm adapter frame 4 includes a vertical plate-shaped main body 401. The inner and outer sides of the main body 401 are integrally provided with grid ribs 402. The inner side of the main body 401 is integrally provided with an upper horizontal edge 403. The upper horizontal edge 403 and the main body 401 below it form a frame mounting position. A U-shaped cover 404 is fixed to the rear side of the top area of ​​the main body 401. The open side of the cover 404 faces forward and the top is provided with a swing arm mounting position 405. The tail end of the swing arm body 5 is hinged to the swing arm mounting position 405. The front end of the swing arm body 5 is provided with a horizontal interface 501. The top surface of the front end of the swing arm body 5 is integrally provided with an upwardly extending support arm 502. The top end of the support arm 502 is provided with an upper sleeve 503. The bottom of the front end of the support arm 502 is provided with a limiting ear 504 that cooperates with the limiting block 305. The two ends of the connecting rod 1 are installed in the horizontal interfaces 501 of the two swing arm bodies 5; The cab connecting frame 6 includes a horizontal plate portion 601. The front end of the horizontal plate portion 601 is integrally provided with a downwardly inclined extension portion 602. The top edge of the extension portion 602 is provided with side portions 603 on both sides, with the top edge flush with the horizontal plate portion 601. A vertical side portion 604 is provided on the upper front side between the two side portions 603. The vertical side portion 604, the horizontal plate portion 601 and the top edge of the side portions 603 together form the cab connecting position. A fixing pin 605 is provided at the front end between the two side portions 603, which is hinged to the upper sleeve 503 of the swing arm body 5. The cab connecting frame 6 is provided with several third weight reduction ports 610. The cab connecting frame 6 has a T-shaped outer support arm 607 on its outer side. The bottom end of the outer support arm 607 is provided with an upper pin 608 through a hinge seat 606. The top and bottom ends of the shock absorber 7 are respectively hinged to the upper pin 608 and the lower pin 306.

[0029] Among them, such as Figure 3 As shown, the bottom horizontal rib 304 has an inner arc edge 308 with a concave structure at one end near the lower pin 306. The inner arc edge 308 forms two parallel support ears 309 on the outer sides of the two side plates 302, and the lower pin 306 is installed between the two support ears 309.

[0030] Among them, such as Figure 1-3 As shown, a plurality of first weight-reducing openings 307 include a triangular structure hole provided on the side plate 302, a hole provided on the bottom horizontal rib 304, and a hole provided in the vertical plate area of ​​the mounting base 301.

[0031] Among them, such as Figure 1-2 and Figure 4 As shown, the main body 401 is divided into an upper section, a middle section and a lower section with decreasing thickness from top to bottom. The cover 404 is installed in the upper section and the upper horizontal edge 403 is integrally set in the middle section.

[0032] Among them, such as Figure 1-2 and Figure 5 As shown, the swing arm body 5 has an I-shaped cross section and is provided with several second weight reduction openings 505. The connection between the support arm 502 and the swing arm body 5 is provided with a connecting rib 506. The outer side of the swing arm body 5 is integrally provided with a fixing opening 507. The tail end of the swing arm body 5 is integrally provided with a rear sleeve 508. The rear sleeve 508 is hinged at the swing arm mounting position 405 and its two ends are respectively attached to the inner sides of the cover 404.

[0033] Among them, such as Figure 1-2 and Figure 4 As shown, a height valve 8 is fixed to the front side of the upper partition of the two main bodies 401 by a bracket, and the detection end of the height valve 8 is connected to the fixing port 507 on the outside of the swing arm body 5.

[0034] Among them, such as Figure 2-4 and Figure 6 As shown, at least one lug is integrally provided at the two corners of the horizontal side of the mounting base 301, both sides of the vertical side of the mounting base 301, the two corners of the upper horizontal side 403, both sides of the lower section of the main body 401, the four corners of the horizontal plate 601, and the two corners of the top of the vertical side 604.

[0035] Among them, such as Figure 1-2 and Figure 6As shown, a diagonal rib 609 is integrally provided between the rear side of the vertical side 604 and the extension 602. Several third weight-reducing openings 610 include holes on the diagonal rib 609 and holes on the horizontal plate 601. The front end of the extension 602 is provided with an inwardly recessed inner clearance opening 611 that cooperates with the upper sleeve 503.

[0036] Among them, such as Figure 2 and Figure 5-6 As shown, cylindrical portions 612 are provided at the connection points between the inclined rib portion 609 and the two side portions 603 on both sides. The cylindrical portions 612 are provided with threaded openings, and the fixing pins 605 are installed on the two cylindrical portions 612 through fasteners and threaded openings.

[0037] Among them, such as Figure 2 and Figure 5-6 As shown, a bearing is installed on the fixing pin 605, and the upper sleeve 503 is installed on the outer ring of the bearing. Both ends of the fixing pin 605 are provided with waist-shaped cross-section connecting sections 613. The connecting sections 613 are provided with through holes, and the fasteners pass through the through holes and are threaded onto the threaded opening of the cylindrical part 612.

[0038] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," 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 invention. In this specification, 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.

[0039] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A front suspension system for a heavy-duty truck cab, characterized in that: It includes a connecting rod (1) and a front suspension (2) set at both ends of the connecting rod (1). The front suspension (2) includes a frame connecting frame (3), a swing arm adapter (4), a swing arm body (5), a cab connecting frame (6), and a shock absorber (7). The frame connecting frame (3) includes an inverted L-shaped mounting base (301). Both sides of the outer side of the mounting base (301) are provided with side plates (302) with an outer arc surface and a triangular structure. The top and bottom of the two side plates (302) are respectively provided with a top edge (303) and a bottom cross rib (304). A limit block (305) is fixed on the top surface of the top edge (303). A lower pin (306) is provided on the outer side between the two side plates (302). The frame connecting frame (3) is provided with a plurality of first weight reduction ports (307). The swing arm adapter (4) includes a vertical plate-shaped main body (401), and the inner and outer sides of the main body (401) are integrally provided with mesh ribs (402). The inner side of the main body (401) is integrally provided with an upper horizontal edge (403). The upper horizontal edge (403) and the main body (401) below it form a frame mounting position. A U-shaped cross-section cover (404) is fixed to the rear side of the top area of ​​the main body (401). The open side of the cover (404) faces forward and the top is provided with a swing arm mounting position (405). The tail end of the swing arm body (5) is hinged at the swing arm mounting position (405). The front end of the swing arm body (5) is provided with a horizontal interface (501). The top surface of the front end of the swing arm body (5) is integrally provided with an upwardly extending support arm (502). The top end of the support arm (502) is provided with an upper sleeve (503). The bottom of the front end of the support arm (502) is provided with a limiting ear (504) that cooperates with the limiting block (305). The two ends of the connecting rod (1) are installed in the horizontal interface (501) of the two swing arm bodies (5); The cab connecting frame (6) includes a horizontal plate (601), the front end of which is integrally provided with a downwardly inclined extension (602), the top edge of which is provided with side edge (603) on both sides, the top edge of which is flush with the horizontal plate (601), the upper front side between the two side edge (603) is provided with a vertical edge (604), the top edge of the vertical edge (604), the horizontal plate (601) and the side edge (603) together form the cab connecting position, the front end between the two side edge (603) is provided with a fixing pin (605) that is hinged to the upper sleeve (503) of the swing arm body (5), and the cab connecting frame (6) is provided with a plurality of third weight reduction ports (610). The cab connecting frame (6) has a T-shaped outer support arm (607) on its outer side. The bottom end of the outer support arm (607) is provided with an upper pin (608) through a hinge seat (606). The top and bottom ends of the shock absorber (7) are respectively hinged to the upper pin (608) and the lower pin (306).

2. The front suspension system for a heavy-duty truck cab according to claim 1, characterized in that, The bottom horizontal rib (304) has an inner arc edge (308) with a concave structure at one end near the lower pin (306). The inner arc edge (308) forms two parallel support ears (309) on the outer side of the two side plates (302). The lower pin (306) is installed between the two support ears (309).

3. The front suspension system for a heavy-duty truck cab according to claim 1, characterized in that, The first weight reduction port (307) includes a triangular structure hole provided on the side plate (302), a hole provided on the bottom horizontal rib (304), and a hole provided in the vertical plate area of ​​the mounting base (301).

4. The front suspension system for a heavy-duty truck cab according to claim 1, characterized in that, The main body (401) is divided into an upper section, a middle section and a lower section with decreasing thickness from top to bottom. The cover (404) is installed in the upper section and the upper horizontal edge (403) is integrally set in the middle section.

5. The front suspension system for a heavy-duty truck cab according to claim 4, characterized in that, The swing arm body (5) has an I-shaped cross section and is provided with several second weight reduction ports (505). The support arm (502) is connected to the swing arm body (5) with a connecting rib (506). The swing arm body (5) is integrally provided with a fixing port (507) on the outer side. The swing arm body (5) is integrally provided with a rear sleeve (508) at the tail end. The rear sleeve (508) is hinged at the swing arm mounting position (405) and its two ends are respectively attached to the inner sides of the cover (404).

6. The front suspension system for a heavy-duty truck cab according to claim 5, characterized in that, A height valve (8) is fixed to the front side of the upper partition of the two main bodies (401) by a bracket, and the detection end of the height valve (8) is connected to the fixing port (507) on the outside of the swing arm body (5).

7. The front suspension system for a heavy-duty truck cab according to claim 4, characterized in that, At least one support lug is integrally provided at the two corners of the horizontal side of the mounting base (301), both sides of the vertical side of the mounting base (301), the two corners of the upper horizontal side (403), both sides of the lower section of the main body (401), the four corners of the horizontal plate (601), and the two corners of the top of the vertical side (604).

8. The front suspension system for a heavy-duty truck cab according to claim 1, characterized in that, The rear side of the vertical side (604) and the extension (602) are integrally provided with a diagonal rib (609), and a plurality of the third weight reduction ports (610) include holes on the diagonal rib (609) and holes on the horizontal plate (601). The front end of the extension (602) is provided with an inwardly concave inner relief port (611) that cooperates with the upper sleeve (503).

9. A front suspension system for a heavy-duty truck cab according to claim 8, characterized in that, The inclined rib (609) is provided with cylindrical parts (612) at the connection between its two sides and the two side parts (603). The cylindrical parts (612) are provided with threaded openings. The fixing pin (605) is installed on the two cylindrical parts (612) by fasteners and threaded openings.

10. A front suspension system for a heavy-duty truck cab according to claim 9, characterized in that, The fixed pin (605) is equipped with a bearing, the upper sleeve (503) is installed on the outer ring of the bearing, and both ends of the fixed pin (605) are provided with waist-shaped connecting sections (613). The connecting sections (613) are provided with through holes, and the fastener passes through the through holes and is threaded onto the threaded opening of the cylindrical part (612).

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