Five-column type tractor cab

Abstract

A five-column type tractor cab relates to the technical field of tractor cab structures and structurally comprises a cab framework and cab doors and windows. The cab framework is of a five-column structure and comprises a floor, left / right side walls, left front / middle / rear stand columns, right front / rear stand columns, front / rear walls and a top ring beam. The bottom of the left middle stand column is welded to the left side wall, and the top end is welded to the top ring beam. The cab door and window comprises a front windshield, a left door, a left side window, a right door and rear window glass. The rear end of the left door glass is rotatably connected to the left middle column, and a door lock is arranged between the front end and the left front column; a side window lock is arranged between the front end of the left window glass and the left middle stand column; the rear end of the right door glass is rotatably connected to the right rear column, and a door lock is arranged between the front end and the right front column. By means of the cab, the technical problems that an existing four-column cab is inconvenient to get on and off a vehicle, a door is prone to drooping, ventilation is poor, and a right middle column of a six-column cab is poor in operation comfort can be solved.

Description

Technical Field

[0001] This invention relates to the field of tractor cab structure technology, specifically a five-post tractor cab. Background Technology

[0002] Currently, domestic tractor manufacturers are gradually shifting from six-post to four-post cab designs to improve driver visibility. While this change enhances visibility, it also introduces new problems. Compared to six-post cabs, four-post cabs have fewer left, right, and center pillars, resulting in larger door windows and more rearward hinges. Consequently, for the same door width, the opening angle of a four-post cab is smaller than that of a six-post cab, making it inconvenient for the driver to get in and out. Furthermore, the larger door windows make the doors prone to sagging, further complicating opening and closing. Additionally, the lack of side windows in four-post cabs leads to poor ventilation.

[0003] The traditional six-pillar cab, due to the presence of the central pillar, has limited space when arranging the control levers on the right-side control panel, making it easy to bump into the central pillar and resulting in poor operating comfort. Summary of the Invention

[0004] The purpose of this invention is to provide a five-post tractor cab. By designing the tractor cab as a five-post structure, it can solve the technical problems of inconvenience in getting up and down, easy door sagging and poor ventilation in the existing four-post cab, and the poor operating comfort of the right middle post in the six-post tractor.

[0005] To achieve the above objectives, the present invention adopts the following technical solution.

[0006] A five-post tractor cab includes a cab frame and cab doors and windows.

[0007] The cab frame is a five-pillar structure, including the floor, left side panel, right side panel, left front pillar, left center pillar, left rear pillar, right front pillar, right rear pillar, front panel, rear panel, and top ring beam.

[0008] The front, left, right, and rear sections are all welded to the floor. The bottoms of the left and right front pillars are welded to the floor. The bottom of the left center pillar is welded to the left side section. The bottom of the left rear pillar is welded to both the left and rear sections. The bottom of the right rear pillar is welded to both the right and rear sections. The top ring beam is welded to the tops of the left, right, left center, left, and right rear pillars.

[0009] The cab doors and windows include the windshield, left door glass, left side window glass, right door glass, and rear window glass.

[0010] The windshield is mounted on the front frame, which consists of the floor, left front pillar, right front pillar, top ring beam, and front bulkhead. The rear end of the left door glass is rotatably connected to the left center pillar, and a door lock is installed between the front end of the left door glass and the left front pillar. The rear end of the left side window glass is rotatably connected to the left rear pillar, and a side window lock is installed between the front end of the left side window glass and the left center pillar. The rear end of the right door glass is rotatably connected to the right rear pillar, and a door lock is installed between the front end of the right door glass and the right front pillar. The upper end of the rear window glass is rotatably connected to the top ring beam, and a rear window lock is installed between the lower end of the rear window glass and the rear bulkhead.

[0011] Furthermore, the rotatable connections between the left door glass and the left central pillar, the left side window glass and the left rear pillar, and the rear window glass and the top ring beam are all hinged connections.

[0012] Furthermore, the top ring beam includes four trapezoidal tubes: front, rear, left, and right. The two ends of the front trapezoidal tube are welded to the left front column and the right front column, respectively. The two ends of the rear trapezoidal tube are welded to the left rear column and the right rear column, respectively. The two ends of the left trapezoidal tube are welded to the left front column and the left rear column, respectively. The top of the left middle column is welded to the middle of the left trapezoidal tube, and the two ends of the right trapezoidal tube are welded to the right front column and the right rear column, respectively. Triangular ribs are provided at the corners of the welded connections to increase the strength of the frame.

[0013] Furthermore, triangular reinforcement is also provided between adjacent trapezoidal tubes in the top ring beam.

[0014] Furthermore, the bottom of the front bulkhead is welded to the floor, and gaps are left between the two sides of the front bulkhead and the left and right front pillars, respectively, to increase the driver's forward visibility.

[0015] Furthermore, the windshield is a single piece of glass, which is glued and fixed to the front frame with sealant.

[0016] Furthermore, the cab also includes an air conditioning system and interior components. The air conditioning system includes an evaporator box located on the top of the cab and a main air duct connecting the air outlet of the evaporator box. The interior components include an interior roof, pillar interiors, left side interiors, right side interiors, front interiors, rear interiors, and floor mats.

[0017] The interior roof has an evaporator return air vent at the rear, an inner roof air vent on both sides that connect to the main air duct, and a defrost air vent at the front that connects to the main air duct.

[0018] Furthermore, the main air duct connects the left front pillar air duct, the left middle pillar air duct, and the right front pillar air duct. The interior trim of the pillars corresponding to the left front pillar air duct, the left middle pillar air duct, and the right front pillar air duct is equipped with a front pillar air outlet and a left middle pillar air outlet.

[0019] Furthermore, the interior roof, pillar interior, left side interior, right side interior, front interior, and rear interior are all fixed to the cab frame with plastic fasteners, overlapping and fitting together. The floor mat is laid flat on the floor, overlapping and fitting together with the left side interior, right side interior, front interior, and rear interior.

[0020] Furthermore, the left side interior includes a left control panel body, on which a storage box and a storage box cover are provided; the right side interior includes a right control panel body, on which a control handle cover and an electrical switch cover are provided.

[0021] Furthermore, the storage box is equipped with an air outlet that connects to the bottom of the left central column air duct.

[0022] By adopting the above technical solution, the present invention has the following beneficial effects: 1. The five-column cab of this invention, by setting a left center column, can achieve a larger opening angle for the left door, making it easier for the driver to get on and off the vehicle, while retaining the left side window, making the cab more ventilated. 2. The five-pillar cab in this invention eliminates the right center pillar, making the right-side control handle arrangement more comfortable and reasonable, while also providing better visibility on the right side; 3. In this invention, the five-pillar cab introduces the air conditioning cold air into the storage box of the left control panel through the air duct of the left middle pillar, so as to realize the function of cold storage. 4. In this invention, the central crossbeam of the driver's cab windshield is eliminated, and the windshield glass is a single piece, providing good forward visibility. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of the cab frame in this invention.

[0024] Figure 2 This is a schematic diagram of the overall structure of the driver's cab doors and windows in this invention (left rear view).

[0025] Figure 3 This is a schematic diagram of the overall structure of the driver's cab doors and windows from another perspective (right front view) in this invention.

[0026] Figure 4 This is a top view of the left and right doors of the driver's cab in the open state of this invention.

[0027] Figure 5 This is a schematic diagram of the overall structure of the air conditioning system in this invention.

[0028] Figure 6 This is a schematic diagram of the overall structure of the interior roof in this invention.

[0029] Figure 7 This is a schematic diagram of the overall structure of the left control console body in this invention.

[0030] Figure 8 This is a schematic diagram of the overall structure of the interior components in this invention (the interior roof is omitted).

[0031] Attached diagram descriptions: 11. Floor; 12. Left side panel; 13. Right side panel; 14. Front panel; 15. Rear panel; 21. Left front pillar; 22. Left center pillar; 23. Left rear pillar; 24. Right front pillar; 25. Right rear pillar; 31. Roof beam; 311. Triangular rib; 41. Windshield; 42. Left door glass; 43. Left side window glass; 44. Right door glass; 45. Rear window glass; 51. Evaporator; 52. Main air duct; 61. Interior roof trim; 611. Return air vent. 612. Interior top air vent; 613. Defrost air vent; 62. Pillar interior trim; 621. Front pillar air vent; 622. Left center pillar air vent; 63. Left side interior trim; 631. Left control panel body; 632. Storage box; 633. Storage box cover; 634. Storage box air vent; 64. Right side interior trim; 641. Right control panel body; 642. Control handle cover; 643. Electrical switch cover; 65. Front interior trim; 66. Rear interior trim; 67. Floor mat. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the present invention clearer, the features and performance of a five-post tractor cab of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0033] Please see the appendix Figures 1-8 A five-post tractor cab, comprising a cab frame and cab doors and windows.

[0034] The cab frame is a five-pillar structure, including floor 11, left side panel 12, right side panel 13, left front pillar 21, left center pillar 22, left rear pillar 23, right front pillar 24, right rear pillar 25, front panel 14, rear panel 15, and top ring beam 31.

[0035] The front enclosure 14, left side enclosure 12, right side enclosure 13, and rear enclosure 15 are all welded to the floor 11. The bottoms of the left front pillar 21 and right front pillar 24 are welded to the floor 11. The bottom of the left center pillar 22 is welded to the left side enclosure 12. The bottom of the left rear pillar 23 is welded to the left side enclosure 12 and the rear enclosure 15. The bottom of the right rear pillar 25 is welded to the right side enclosure 13 and the rear enclosure 15. The top ring beam 31 is welded to the top of the left front pillar 21, right front pillar 24, left center pillar 22, left rear pillar 23, and right rear pillar 25.

[0036] Specifically, the top ring beam 31 includes four trapezoidal tubes: front, rear, left, and right. The two ends of the front trapezoidal tube are welded to the left front column 21 and the right front column 24, respectively. The two ends of the rear trapezoidal tube are welded to the left rear column 23 and the right rear column 25, respectively. The two ends of the left trapezoidal tube are welded to the left front column 21 and the left rear column 23, respectively. The top of the left middle column 22 is welded to the middle of the left trapezoidal tube. The two ends of the right trapezoidal tube are welded to the right front column 24 and the right rear column 25, respectively. Triangular ribs 311 are provided at the corners of the welded connections to increase the strength of the frame. Triangular ribs 311 are also provided between adjacent trapezoidal tubes in the top ring beam 31.

[0037] The bottom of the front bulkhead 14 is welded to the floor 11. There are gaps between the two sides of the front bulkhead 14 and the left front pillar 21 and the right front pillar 24, respectively, to increase the driver's forward visibility.

[0038] The cab doors and windows include the windshield 41, the left door glass 42, the left side window glass 43, the right door glass 44, and the rear window glass 45.

[0039] The windshield 41 is mounted on the front frame consisting of the floor 11, the left front pillar 21, the right front pillar 24, the top ring beam 31, and the front bulkhead 14. The rear end of the left door glass 42 is rotatably connected to the left center pillar 22, and a door lock is provided between the front end of the left door glass 42 and the left front pillar 21. The rear end of the left side window glass 43 is rotatably connected to the left rear pillar 23, and a side window lock is provided between the front end of the left side window glass 43 and the left center pillar 22. The rear end of the right door glass 44 is rotatably connected to the right rear pillar 25, and a door lock is provided between the front end of the right door glass 44 and the right front pillar 24. The upper end of the rear window glass 45 is rotatably connected to the top ring beam 31, and a rear window lock is provided between the lower end of the rear window glass 45 and the rear bulkhead 15.

[0040] Specifically, the rotatable connections between the left door glass 42 and the left center pillar 22, the left side window glass 43 and the left rear pillar 23, and the rear window glass 45 and the top ring beam 31 are all hinged connections. The windshield 41 is a single piece of glass, which is fixed to the front frame with sealant.

[0041] The cab also includes an air conditioning system and interior components. The air conditioning system includes an evaporator 51 located on the top of the cab and a main air duct 52 connected to the air outlet of the evaporator 51. The main air duct 52 connects to the left front pillar air duct, the left middle pillar air duct and the right front pillar air duct.

[0042] The interior components include an interior roof 61, pillar interior trim 62, left side interior trim 63, right side interior trim 64, front interior trim 65, rear interior trim 66, and a floor mat 67. The interior roof 61, pillar interior trim 62, left side interior trim 63, right side interior trim 64, front interior trim 65, and rear interior trim 66 are all fixed to the cab frame with plastic fasteners, overlapping each other. The floor mat 67 is laid flat on the floor 11, overlapping with the left side interior trim 63, right side interior trim 64, front interior trim 65, and rear interior trim 66.

[0043] The left side interior 63 includes a left control panel body 631, on which a storage box 632 and a storage box cover 633 are provided. The right side interior 64 includes a right control panel body 641, on which a control handle cover 642 and an electrical switch cover 643 are provided.

[0044] The interior roof 61 has a return air vent 611 for the evaporator 51 at the rear, interior roof air outlets 612 on both sides communicating with the main air duct 52, and a defrost air vent 613 at the front communicating with the main air duct 52. The interior trim 62 of the pillars corresponding to the left front pillar air duct, left center pillar air duct, and right front pillar air duct has a front pillar air outlet 621 and a left center pillar air outlet 622. The storage compartment 632 has a storage compartment air outlet 634 connecting to the bottom of the left center pillar air duct 22.

[0045] In a specific implementation, a five-post tractor cab includes a cab frame, cab doors and windows, an air conditioning system, and interior components. The cab frame is a five-post frame structure, including a floor 11, left side panel 12, right side panel 13, front panel 14, rear panel 15, left front pillar 21, left center pillar 22, left rear pillar 23, right front pillar 24, right rear pillar 25, and a top ring beam 31.

[0046] like Figure 1 As shown, the top ring beam 31, composed of four trapezoidal tubes in the front, rear, left, and right directions, is welded to the left front column 21, left middle column 22, left rear column 23, right front column 24, and right rear column 25, respectively. At the corners of the welds, triangular ribs 311 are added to strengthen the frame.

[0047] The upper end of the left front pillar 21 is welded and fixed to the top ring beam 31, and the lower end is welded and fixed to the floor 11. The upper end of the right front pillar 24 is welded and fixed to the top ring beam 31, and the lower end is welded and fixed to the floor 11. The upper end of the left center pillar 22 is welded and fixed to the top ring beam 31, and the lower end is welded and fixed to the left side panel 12. The upper end of the left rear pillar 23 is welded and fixed to the top ring beam 31, and the lower end is welded and fixed to the left side panel 12 and the rear panel 15 respectively. The upper end of the right rear pillar 25 is welded and fixed to the top ring beam 31, and the lower end is welded and fixed to the right side panel 13 and the rear panel 15 respectively.

[0048] The front panel 14 is welded to the floor 11 by a U-shaped rectangular tube. Only the lower end of the front panel 14 is welded to the floor 11. The left and right ends are not connected to the left and right front pillars. This is to reduce obstruction of the front view and increase the front view.

[0049] The left side panel 12 is fixedly connected to the left center column 22, the left rear column 23, the rear panel 15, and the floor 11 by welding. The right side panel 13 is fixedly connected to the right rear column 25, the rear panel 15, and the floor 11 by welding. The rear panel 15 is fixedly connected to the left rear column 23, the right rear column 25, the left side panel 12, the right side panel 13, and the floor 11 by welding.

[0050] The floor 11 is fixedly connected to the left front post 21, the right front post 24, the left side panel 12, the right side panel 13, the front panel 14, and the rear panel 15 by welding.

[0051] like Figure 2 and 3 As shown, the cab doors and windows include a windshield 41, a left door glass 42, a left side window 43, a right door glass 44, and a rear window 45. The windshield 41 is a single piece of glass, adhered to the front frame formed by the floor 11, front bulkhead 14, left front pillar 21, right front pillar 24, and roof beam 31 using sealant. The rear end of the left door glass 42 is fixed to the left center pillar 22 via two hinges, while the front end is fixed to the left front pillar 21 via a door lock. The rear end of the left side window 43 is fixed to the left rear pillar 23 via a hinge, while the front end is fixed to the left center pillar 22 via a side window lock. Opening the side window lock allows the side window to be opened, enabling ventilation of the cab. The rear end of the right door glass 44 is fixed to the right rear pillar 25 via a hinge, while the front end is fixed to the right front pillar 24 via a door lock. With the right center pillar removed and no side window, the right door glass 44 is larger, providing more space on the right side and better visibility. The upper end of the rear window glass 9 is fixed to the top ring beam 31 by hinges, and the lower end is fixed to the rear bulkhead 15 by a rear window lock. Each glass pane is fitted with a sealing strip around its perimeter to ensure a tight seal.

[0052] like Figure 4As shown, the opening angle of the left door after opening is L, and the opening angle of the right door after opening is R. Assume that S is the driver's position point, A is the point of force exerted by the driver when closing the left door handle, B is the intersection of the line SA connecting the left door and the left door glass when the left door of the cab is closed, and C is the projection point of the left door hinge axis; similarly, D is the point of force exerted by the driver when closing the right door handle, E is the intersection of the line SE connecting the right door and the right door glass when the right door of the cab is closed, and F is the projection point of the right door hinge axis. After the driver enters the cab, under the same door closing convenience (SA = SD), the driver's position is in the center, so SB = SE and AB = DE. Since the hinge of the left door glass 42 is fixed to the left center pillar 22 and the hinge of the right door glass 44 is fixed to the right rear pillar 25, BC < EF. Setting BC⊥AB and EF⊥DE, we know that L = arctan(AB / BC) and R = arctan(DE / EF). Therefore, L > R, meaning the opening angle of the left door is greater than that of the right door. It is more convenient for the driver to get in and out of the vehicle from the left door than from the right door.

[0053] When drivers actually use tractors, the right side of the tractor cab houses components such as the gear lever and control handles, making it inconvenient for the driver to enter and exit from the right. Furthermore, given the driving habits in China, drivers more often enter and exit from the left door, with less frequent use of the right door. Therefore, this invention retains the left-side center pillar to better meet the driver's actual needs, while eliminating the right-side center pillar to accommodate the increased operating space required to improve driving comfort due to the numerous control components on the right side of the tractor cab.

[0054] like Figures 5-8 As shown, the air conditioning system in the driver's cab includes an evaporator 51, a main air duct 52, a front pillar air duct, and a left and middle pillar air duct. The interior trim includes an interior roof 61, a return air vent 611, an interior roof air vent 612, a defrost air vent 613, pillar trim 62, a front pillar air vent 621, a left and middle pillar air vent 622, a left side trim 63, a storage box air vent 634, a right side trim 64, a front side trim 65, a rear side trim 66, and a floor mat 67.

[0055] The evaporator box 51 is fixedly connected to the frame on the top of the cab. The air outlet of the evaporator box 51 is connected to the air inlet of the main air duct 52. The main air duct 52 has an air outlet at the lower left that is connected to the air duct of the left middle pillar. The main air duct 52 has air outlets at the front left and front right that are connected to the air duct of the front pillar. The air duct of the left middle pillar leads to the storage box 632 on the left side of the interior 63.

[0056] An air return vent 611 is arranged behind the interior roof 61, an interior roof air outlet vent 612 is arranged on the left and right sides, and a defrost vent 613 is arranged in front. The air return vent 611 is connected to the evaporator box 51. There are three interior roof air outlets 612 on each side, which are connected to the main air duct 52. There is one defrost vent 613 on each side, which is connected to the main air duct 52.

[0057] The pillar interior trim 62 includes the front pillar interior trim, the left center pillar interior trim, and the rear pillar interior trim. The front pillar air vent 621 is mounted on the front pillar interior trim and connected to the front pillar air duct. The left center pillar air vent 622 is mounted on the left center pillar interior trim and connected to the left center pillar air duct. The storage box air vent 634 is mounted inside the storage box 632 of the left side interior trim 63 and is also connected to the left center pillar air duct.

[0058] After the air conditioning is turned on, air from the driver's cabin enters the evaporator 51 through the return air vent 611. The cooled air then flows from the main air duct 52 to the inner roof air vent 612, defrost air vent 613, front pillar air vent 621, left and center pillar air vent 622, and storage box air vent 634. The cold air is blown into the driver's cabin from all directions—front, center, rear, top, and bottom—and then returns through the return air vent 611, creating a circulating cooling effect within the cabin. The cooling effect is uniform and effective. Notably, in this embodiment, the direction of each air vent can be adjusted when open, and they can be closed independently, allowing the driver to adjust them as needed.

[0059] like Figure 7 As shown, the left side of the interior 63 is equipped with a left control panel body 631, a storage box cover 633, and a cover hinge. The left control panel body 631 has a concave notch. On the one hand, it can release the air pressure in the storage box 632, so that air can be formed in the storage box 632, improving the refrigeration effect. That is, cold air is blown into the storage box 632 from the storage box air outlet 634 and then flows out from the concave notch, avoiding excessive pressure in the storage box 632, which would affect the air volume of the storage box air outlet 634. On the other hand, the concave notch serves as a leverage point, making it easy to open the storage box cover 633 by hand.

[0060] When refrigeration is required, turn on the air conditioner and open the air outlet 634 of the storage box. Cold air reaches the storage box 632 to realize the refrigeration function. The air speed of the air outlet 634 of the storage box can be increased by closing the other air outlets to achieve the effect of lowering the refrigeration temperature.

[0061] like Figure 8 As shown, the right side interior panel 64 is equipped with a right control panel body 641, a control handle cover 642, and an electrical switch cover 643. Since the right side central column is eliminated, there is no space restriction when arranging the control handle and electrical switch, and the control handle is placed in a more comfortable area.

[0062] It should be noted that the parts not described in detail in this solution are all prior art. The above embodiments are only used to illustrate the present invention, but the present invention is not limited to the above embodiments. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. A five post tractor cab comprising a cab skeleton and cab doors and windows characterised in that: The cab framework is a five-column structure, including a floor (11), a left side wall (12), a right side wall (13), a left front column (21), a left middle column (22), a left rear column (23), a right front column (24), a right rear column (25), a front wall (14), a rear wall (15), and a top ring beam (31). The front wall (14), the left side wall (12), the right side wall (13), and the rear wall (15) are all welded to the floor (11). The bottom of the left front column (21) and the bottom of the right front column (24) are both welded to the floor (11). The bottom of the left middle column (22) is welded to the left side wall (12). The bottom of the left rear column (23) is welded to the left side wall (12) and the rear wall (15). The bottom of the right rear column (25) is welded to the right side wall (13) and the rear wall (15). The top of the top ring beam (31) is welded to the top of the left front column (21), the top of the right front column (24), the top of the left middle column (22), the top of the left rear column (23), and the top of the right rear column (25). The cab door and window include a front windshield (41), a left door glass (42), a left side window glass (43), a right door glass (44), and a rear window glass (45). The front windshield (41) is arranged on a front frame formed by the floor (11), the left front column (21), the right front column (24), the top ring beam (31), and the front wall (14). The rear end of the left door glass (42) is rotatably connected to the left middle column (22). A door lock is arranged between the front end of the left door glass (42) and the left front column (21). The rear end of the left side window glass (43) is rotatably connected to the left rear column (23). A side window lock is arranged between the front end of the left side window glass (43) and the left middle column (22). The rear end of the right door glass (44) is rotatably connected to the right rear column (25). A door lock is arranged between the front end of the right door glass (44) and the right front column (24). The upper end of the rear window glass (45) is rotatably connected to the top ring beam (31). A rear window lock is arranged between the lower end of the rear window glass (45) and the rear wall (15).

2. A five-post tractor cab as claimed in claim 1, characterised in that: The rotatable connections between the left door glass (42) and the left middle column (22), between the left side window glass (43) and the left rear column (23), and between the rear window glass (45) and the top ring beam (31) are all hinge connections.

3. A five-post tractor cab as claimed in claim 1, characterized in that: The top ring beam (31) includes four trapezoidal tubes arranged in front, back, left, and right directions. The two ends of the front trapezoidal tube are welded to the left front column (21) and the right front column (24), respectively. The two ends of the back trapezoidal tube are welded to the left rear column (23) and the right rear column (25), respectively. The two ends of the left trapezoidal tube are welded to the left front column (21) and the left rear column (23), respectively. The top end of the left middle column (22) is welded to the middle part of the left trapezoidal tube. The two ends of the right trapezoidal tube are welded to the right front column (24) and the right rear column (25), respectively. Triangular ribs (311) are arranged at the corners of the welded connections to increase the strength of the framework.

4. A five-post tractor cab as claimed in claim 3, characterised in that: Triangular ribs (311) are also arranged between the adjacent trapezoidal tubes of the top ring beam (31).

5. A five-post tractor cab as claimed in claim 1, characterized in that: The front wall (14) is welded to the floor (11) at the bottom end, and gaps are left between the front wall (14) and the left front pillar (21) and the right front pillar (24) on both sides, so as to increase the front field of view of the driver.

6. A five post tractor cab as claimed in claim 1, characterized in that: The front windshield (41) is an integral whole glass, which is fixed on the front frame by sealing glue.

7. A five post tractor cab as claimed in claim 1, characterized in that: The cab further comprises an air conditioning system and an interior assembly, the air conditioning system comprises an evaporative box (51) arranged on the top of the cab and a main air duct (52) connected to the air outlet of the evaporative box (51), and the interior assembly comprises an interior top (61), a pillar interior (62), a left side wall interior (63), a right side wall interior (64), a front wall interior (65), a rear wall interior (66) and a floor pad (67). The interior top (61) is provided with a return air outlet (611) of the evaporative box (51) at the rear, air outlets (612) on both sides communicated with the main air duct (52), and a defrosting air outlet (613) communicated with the main air duct (52) at the front.

8. A five-post tractor cab as claimed in claim 7, characterised in that: The main air duct (52) is communicated with the left front pillar air duct, the left middle pillar air duct and the right front pillar air duct, and the pillar interior (62) corresponding to the left front pillar air duct, the left middle pillar air duct and the right front pillar air duct is provided with a front pillar air outlet (621) and a left middle pillar air outlet (622).

9. A five-post tractor cab as claimed in claim 8, characterised in that: The left side wall interior (63) comprises a left console body (631), and the left console body (631) is provided with a storage box (632) and a storage box cover plate (633); the right side wall interior (64) comprises a right console body (641), and the right console body (641) is provided with a handle cover plate (642) and an electrical switch cover plate (643).

10. A five-post tractor cab as claimed in claim 9, characterised in that: The storage box (632) is provided with a storage box air outlet (634) communicated with the bottom of the left middle pillar (22) air duct.

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