Semi-air suspension system of tractor cab and tractor

Abstract

The invention relates to a semi-air suspension suspension system of a tractor cab and a tractor, the semi-air suspension suspension system of the tractor cab comprises two front suspension frames and two rear suspension frames, the two front suspension frames and the two rear suspension frames are arranged at intervals in the left-right direction, and the two front suspension frames and the two rear suspension frames are arranged at intervals in the left-right direction. The two front suspension frames and one of the rear suspension frames are distributed at intervals in the front-back direction, the two front suspension frames each comprise a damping cylinder, and the two rear suspension frames each comprise a rear suspension air spring. By the adoption of the technical scheme, the technical problems that an existing tractor cab suspension system is not obvious in sound insulation and shock absorption effect and poor in cab comfort can be solved.

Description

Technical Field

[0001] The present invention relates to the technical field of tractors, and in particular to a semi-air suspension system of a tractor cab and a tractor. Background Art

[0002] During the start-up and driving of the tractor, the vibration of the engine and the bumps of the road will inevitably be transmitted to the cab through the connection. The cab of a traditional tractor is simply hard-connected to the chassis with bolts or connected with a suspension system using rubber blocks or mechanical springs as load-bearing components. The sound insulation and shock absorption effect is not obvious, and the cab comfort is poor. Summary of the invention

[0003] Aiming at the technical problems that the existing tractor cab suspension system has unclear sound insulation and shock absorption effect and poor cab comfort, the present invention provides a semi-air suspension system for a tractor cab and a tractor.

[0004] The technical solution of the present invention to solve the above technical problems is as follows: The present invention provides a semi-air suspension system for a tractor cab, comprising two front suspension frames and two rear suspension frames, wherein the two front suspension frames and the two rear suspension frames are spaced apart in the left-right direction, and the two front suspension frames are spaced apart from one of the rear suspension frames in the front-back direction, respectively, the two front suspension frames each comprise a shock-absorbing cylinder, and the two rear suspension frames each comprise a rear suspension air spring.

[0005] The beneficial effect of the present invention is that during installation, the upper and lower ends of the two front suspension frames and the two rear suspension frames are respectively connected to the tractor cab and the chassis, the front side of the tractor cab is supported by the two front suspension frames, and the rear side of the tractor cab is supported by the two rear suspension frames, so as to form a front and rear elastic support structure, realize semi-suspension of the cab, and utilize the air pressure in the rear suspension air spring as the bearing force to replace the traditional rubber block or mechanical spring, so as to improve the comfort of the cab at a low cost, thereby improving the technical problems of the existing tractor cab suspension system having the insignificant sound insulation and shock absorption effect and the poor comfort of the cab.

[0006] Based on the above technical solution, the present invention can also be improved as follows.

[0007] Furthermore, it also includes an air circuit, which includes an air inlet end for connecting to a main air pipe of an air storage tank, a three-way valve whose air inlet end is connected to an air outlet end of the main air pipe, and two bronchial pipes, the air inlet ends of the two bronchial pipes are respectively connected to one of the air outlet ends of the three-way valve, and the air outlet ends of the two bronchial pipes are respectively connected to one of the rear suspension air springs.

[0008] The beneficial effect of adopting the above further solution is: by connecting the three-way valve, the gas in the gas storage tank is input into the corresponding rear suspension air spring, thereby realizing the control of the rear suspension air spring.

[0009] Furthermore, the air circuit also includes two height control valves and two exhaust pipes, the air inlet ends of the two height control valves are respectively connected to the air outlet end of one of the bronchial pipes, the air inlet ends of the two exhaust pipes are respectively connected to the air outlet end of one of the height control valves, and the air outlet ends are respectively connected to one of the rear suspension air springs.

[0010] The beneficial effect of adopting the above further scheme is: the gas in the air tank is input into the height control valve, and then into the corresponding rear suspension air spring to realize the control of the rear suspension, so that the left and right height control valves can independently adjust the cab, which can solve the problem of large unilateral bouncing and tilting of the cab caused by the tire on one side of the cab passing through a pothole or a bump.

[0011] Furthermore, the two rear suspension frames also include a rear upper bracket, a rear lower bracket and a stabilizer bar, the rear end of the rear upper bracket is rotatably connected to the piston rod of the corresponding rear suspension air spring, the rear lower bracket is located at the lower side of the rear upper bracket, and the rear end supports and is rotatably connected to the cylinder body of the corresponding rear suspension air spring, the two ends of the stabilizer bar are respectively rotatably connected to the front end of the rear upper bracket and the rear end of the rear lower bracket, and the angle between the projection of the stabilizer bar on the horizontal plane and the straight line where the front and rear directions are located is not less than 45° and not greater than 90°.

[0012] The beneficial effect of adopting the above further scheme is: during installation, the two rear upper brackets are connected to the tractor cab, and the two rear lower brackets are connected to the chassis of the tractor to achieve suspension support; during the support process, the stabilizer bar and the corresponding rear suspension air spring form front and rear supports to ensure the stability of the support. At the same time, because the angle between the stabilizer bar and the straight line in the front and rear directions is not less than 45° and not greater than 90°, when the cab shakes in the left and right directions, the component force received in the left and right directions is greater than the component force in the front and rear directions, thereby controlling the left and right shaking of the cab, so that it can perform self-adjustment under harsh road conditions in the field, and improve the comfort of the cab at a low cost.

[0013] Furthermore, both ends of the stabilizer bar are fixedly connected with connecting tubes, each of the connecting tubes is penetrated by a rear bolt, and each of the rear bolts is sleeved with a rear shock-absorbing sleeve, and both ends of each connecting tube are respectively connected to the front end of the rear upper bracket and the rear end of the rear lower bracket through the corresponding rear bolts.

[0014] The beneficial effect of adopting the above further scheme is that when the cab and / or chassis are bumpy or shaken, the corresponding stabilizer bar adaptively rotates under the connection of the corresponding rear bolts, and at the same time controls the left and right shaking of the cab, and in this process, the rear shock-absorbing sleeve can form a shock-absorbing effect to improve the comfort of the cab.

[0015] Furthermore, the two rear suspension frames also include a travel limit assembly, and the two travel limit assemblies each include a clamping plate whose upper end is fixedly connected to the middle part of the rear upper bracket, a limit sleeve whose lower end is fixedly connected to the middle part of the rear lower bracket, and a limit bolt passing through the lower end of the clamping plate, the lower end of the clamping plate is clamped at the upper end of the limit sleeve, the upper end of the limit sleeve is provided with a limit hole, and the limit bolt passes through the limit hole.

[0016] The beneficial effect of adopting the above-mentioned further scheme is: when the rear suspension air spring is damaged or the extreme road conditions exceed the safe stroke of the rear suspension air spring, the corresponding stroke limit assembly begins to work to avoid accidents caused by the cab and the chassis being disconnected. Specifically, the limit bolt can slide up and down in the limit hole. When sliding to the limit position, the corresponding rear upper bracket, stroke limit assembly and rear lower bracket form a stable support to avoid accidents.

[0017] Furthermore, the two travel limit assemblies each include a limit shock absorbing sleeve, and each limit shock absorbing sleeve is arranged on the corresponding limit bolt.

[0018] The beneficial effect of adopting the above further solution is that when the limiting bolt slides up and down in the limiting hole to the limit position, the corresponding limiting shock-absorbing sleeve can abut against the hole wall of the limiting hole, forming a shock-absorbing and buffering effect between the limiting sleeve plate.

[0019] Furthermore, the two front suspension frames also include a front upper bracket, a front lower bracket and a front connecting bolt passing through the shock absorber tube, the front connecting bolt passes through the lower end of the front upper bracket, and the front connecting bolt and the shock absorber tube are simultaneously passed through the upper end of the front lower bracket.

[0020] The beneficial effect of adopting the above further solution is that during installation, the two front upper brackets are connected to the tractor cab, and the two front lower brackets are connected to the chassis of the tractor, so as to achieve suspension support under the connection of the front connecting bolts.

[0021] Furthermore, the front connecting bolts are all sleeved with inner steel sleeves, the outer side of the inner steel sleeves are sleeved with outer steel sleeves, the shock absorber cylinders are all clamped on the corresponding outer sides of the inner steel sleeves and the inner sides of the outer steel sleeves, and the outer steel sleeves are passed through and fixedly connected to the upper end of the front lower bracket.

[0022] The beneficial effect of adopting the above further solution is that the inner steel sleeve and the outer steel sleeve form a clamping and supporting effect on the shock-absorbing cylinder, so as to ensure that the shock-absorbing cylinder forms a long-term, stable and effective shock-absorbing effect.

[0023] The present invention also provides a tractor, comprising a chassis and a cab, and also comprising the semi-air suspension system, wherein the upper and lower ends of the two front suspension frames and the two rear suspension frames of the semi-air suspension system are respectively connected to the cab and the chassis. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural diagram of the present invention; Figure 2 It is the gas path diagram of the present invention; Figure 3 for Figure 1 The structural diagram of the rear suspension frame on the left side of the middle; Figure 4 for Figure 1 The structural diagram of the rear suspension frame on the middle right; Figure 5 is a first cross-sectional view of a rear suspension frame of the present invention; Figure 6 A top view of the rear suspension frame of the present invention; Figure 7 is a second cross-sectional view of the rear suspension frame of the present invention; Figure 8 for Figure 1 The structural diagram of the front suspension frame on the left side of the middle; Fig. 9 It is a cross-sectional view of the front suspension frame of the present invention.

[0025] In the accompanying drawings, the components represented by the reference numerals are listed as follows: 1. Front suspension frame; 11. Shock absorber tube; 111. Shock absorber hole; 12. Front upper bracket; 13. Front lower bracket; 14. Front connecting bolt; 15. Inner steel sleeve; 16. Outer steel sleeve; 2. Rear suspension frame; 21. Rear suspension air spring; 22. Rear upper bracket; 23. Rear lower bracket; 24. Stabilizer bar; 241. Connecting tube; 242. Rear bolt; 243. Rear shock absorber sleeve; 244. Rear inner support sleeve; 25. Travel limit assembly; 251. Clamp; 252. Limit sleeve plate; 2521. Limit hole; 253. Limit bolt; 254. Limit shock absorber sleeve; 255. Limit support sleeve; 3. Gas circuit; 31. Main gas pipe; 32. Three-way valve; 33. Bronchial tube; 34. Height control valve; 35. Exhaust pipe; 4. Gas storage tank. DETAILED DESCRIPTION

[0026] The principles and features of the present invention are described below. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0027] Example 1 like Figure 1 The present invention provides a semi-air suspension system for a tractor cab, comprising two front suspension frames 1 and two rear suspension frames 2, the two front suspension frames 1 and the two rear suspension frames 2 are spaced apart in the left-right direction, and the two front suspension frames 1 are spaced apart from one of the rear suspension frames 2 in the front-back direction, the two front suspension frames 1 each include a shock absorbing cylinder 11, and the two rear suspension frames 2 each include a rear suspension air spring 21.

[0028] The beneficial effect of this embodiment is that during installation, the upper and lower ends of the two front suspension frames 1 and the two rear suspension frames 2 are respectively connected to the tractor cab and the chassis, the front side of the tractor cab is supported by the two front suspension frames 1, and the rear side of the tractor cab is supported by the two rear suspension frames 2, so as to form a front and rear elastic support structure, realize semi-suspension of the cab, and utilize the air pressure in the rear suspension air spring 21 as the bearing force to replace the traditional rubber block or mechanical spring, so as to improve the comfort of the cab at a low cost, thereby improving the technical problems of the existing tractor cab suspension system, such as the unclear sound insulation and shock absorption effect and poor cab comfort.

[0029] The rear suspension air spring 21 is a conventional technical means well known to those skilled in the art, so its structure will not be described in detail here.

[0030] The shock absorbing tube 11 can be made of materials such as rubber and silicone.

[0031] Example 2 like Figure 1 and Figure 2 On the basis of Example 1, the semi-air suspension system described in the present invention also includes an air circuit 3, which includes a main air pipe 31 whose air inlet end is used to connect to the air storage tank 4, a three-way valve 32 whose air inlet end is connected to the air outlet end of the main air pipe 31, and two bronchial pipes 33, the air inlet ends of the two bronchial pipes 33 are respectively connected to one of the air outlet ends of the three-way valve 32, and the air outlet ends of the two bronchial pipes 33 are respectively connected to one of the rear suspension air springs 21.

[0032] The beneficial effect of adopting the preferred solution in the above embodiment is that the gas in the gas storage tank 4 is input into the corresponding rear suspension air spring 21 through the connection of the three-way valve 32 to achieve control of the rear suspension air spring 21.

[0033] During driving, when the tractor encounters road bumps or impacts, the rear suspension air spring 21 will deform as the vehicle body vibrates up and down. The air in the air chamber of the rear suspension air spring 21 is continuously compressed and expanded in this process, playing a role of buffering and shock absorption. Since the compression and expansion of the gas is a continuous process, it can effectively absorb and consume the energy brought by the impact of the road, reduce the vibration and bumps of the vehicle body, and improve the ride comfort and the stability of cargo transportation.

[0034] Example 3 like Figure 1 and Figure 2 On the basis of embodiments 1 and 2, the air circuit 3 also includes two height control valves 34 and two exhaust pipes 35, the air inlet ends of the two height control valves 34 are respectively connected to the air outlet end of one of the bronchial pipes 33, the air inlet ends of the two exhaust pipes 35 are respectively connected to the air outlet end of one of the height control valves 34, and the air outlet ends are respectively connected to one of the rear suspension air springs 21.

[0035] The beneficial effect of adopting the preferred scheme in the above embodiment is that the gas in the air tank 4 is input into the height control valve 34, and then input into the corresponding rear suspension air spring 21, so as to realize the control of the rear suspension, so that the left and right two height control valves 34 can independently adjust the cab, which can solve the problem of large unilateral bouncing and tilting of the cab caused by the tire on one side of the cab passing through a pit or a bump.

[0036] Specifically, the height control valve 34 detects the sinking or rising of the chassis. When the vehicle tire falls into a pothole, the height control valve 34 detects the sinking of the chassis and opens its air inlet end to allow compressed air to quickly fill the corresponding rear suspension air spring 21, thereby supporting the cab at its original height in the natural space without changing; when the vehicle passes over a bump, the height control valve 34 detects the rising of the chassis and opens the air vent to quickly discharge the compressed air in the corresponding rear suspension air spring 21, thereby preventing the cab from rising at its original height in the natural space.

[0037] The height control valve 34 is a conventional technical means well known to those skilled in the art, so its structure will not be described in detail here.

[0038] Example 4 like Figure 1 , Figures 3 to 6On the basis of Examples 1-3, the two rear suspension frames 2 also include a rear upper bracket 22, a rear lower bracket 23 and a stabilizer bar 24. The rear end of the rear upper bracket 22 is rotationally connected to the piston rod of the corresponding rear suspension air spring 21. The rear lower bracket 23 is located at the lower side of the rear upper bracket 22, and the rear end supports and is rotationally connected to the cylinder body of the corresponding rear suspension air spring 21. The two ends of the stabilizer bar 24 are rotationally connected to the front end of the rear upper bracket 22 and the rear end of the rear lower bracket 23 respectively, and the angle between the projection of the two stabilizer bars 24 on the horizontal plane and the straight line where the front and rear directions are located is not less than 45° and not greater than 90°.

[0039] The beneficial effect of adopting the preferred scheme in the above embodiment is that, during installation, the two rear upper brackets 22 are connected to the tractor cab, and the two rear lower brackets 23 are connected to the chassis of the tractor to achieve suspension support; during the support process, the stabilizer bar 24 and the corresponding rear suspension air spring 21 form front and rear supports to ensure the stability of the support. At the same time, since the angle between the stabilizer bar 24 and the straight line in the front and rear directions is not less than 45° and not greater than 90°, when the cab shakes in the left and right directions, the component force received in the left and right directions is greater than the component force in the front and rear directions, thereby controlling the left and right shaking of the cab, so that it can perform self-adjustment under harsh road conditions in the field, and improve the comfort of the cab at a low cost.

[0040] As a specific solution of the above embodiment, the angle between the stabilizer bar 24 and the straight line in the front-rear direction is 45°, 50°, 55°, 60°, 65°, 70°, 75°, 80°, 85° and 90°.

[0041] like Figure 1 When the projections of the two stabilizer bars 24 on the horizontal plane extend forward and inward toward the direction of the front suspension frame 1, the two stabilizer bars 24 form an "inward eight-shaped" structure; When the projections of the two stabilizer bars 24 on the horizontal plane both extend toward the left and right directions, the best effect of preventing the cab from shaking left and right can be achieved. At this time, the component force in the left and right direction is the largest relative to the component force in the front and rear direction.

[0042] When the projections of the two stabilizer bars 24 on the horizontal plane extend forward and outward toward the direction of the front suspension frame 1 , the two stabilizer bars 24 form an “outward eight-shaped” structure.

[0043] Example 5 like Figures 3 to 6 On the basis of Examples 1-4, both ends of the stabilizer bar 24 are fixedly connected with connecting tubes 241, each connecting tube 241 is penetrated by a rear bolt 242, and each rear bolt 242 is sleeved with a rear shock-absorbing sleeve 243, and both ends of each connecting tube 241 are respectively connected to the front end of the rear upper bracket 22 and the rear end of the rear lower bracket 23 through the corresponding rear bolts 242.

[0044] The beneficial effect of adopting the preferred scheme in the above embodiment is that when the cab and / or chassis are bumpy or shaken, the corresponding stabilizer bar 24 adaptively rotates under the connection of the corresponding rear bolt 242, and at the same time controls the left and right shaking of the cab, and in this process, the rear shock-absorbing sleeve 243 can form a shock-absorbing effect, thereby improving the comfort of the cab.

[0045] Based on the above embodiment, a rear inner support sleeve 244 is sleeved on the inner side of the rear shock absorbing sleeve 243 . The rear inner support sleeve 244 can be made of steel and is sleeved on the rear bolt 242 to support the rear shock absorbing sleeve 243 through the rear inner support sleeve 244 .

[0046] Among them, two hanging plates are fixedly connected to the lower side of the front end of the rear upper bracket 22 for the installation of the rear bolt 242 located at the upper end of the stabilizer bar 24; the two hanging plates are distributed at both ends of the connecting tube 241 located at the upper end of the stabilizer bar 24, and both form a clearance fit with the connecting tube 241, so as to facilitate adaptive adjustment of the support position when the stabilizer bar 24 is pressed and rotated.

[0047] A U-shaped clamp is fixedly connected to the upper side of the rear end of the rear lower bracket 23 for installation of the rear bolt 242 located at the lower end of the stabilizer bar 24; the two arms of the U-shaped clamp are distributed at both ends of the connecting tube 241 located at the lower end of the stabilizer bar 24, and both form a clearance fit with the connecting tube 241 to facilitate adaptive adjustment of the support position when the stabilizer bar 24 is pressed and rotated.

[0048] The rear shock-absorbing sleeve 243 can be made of materials such as rubber and silicone.

[0049] Example 6 like Figure 4 , Figure 5 as well as Figure 7 On the basis of Examples 1-5, the two rear suspension frames 2 also include a travel limit assembly 25, and the two travel limit assemblies 25 each include a clamping plate 251 whose upper end is fixedly connected to the middle of the rear upper bracket 22, a limit sleeve 252 whose lower end is fixedly connected to the middle of the rear lower bracket 23, and a limit bolt 253 passing through the lower end of the clamping plate 251, the lower end of the clamping plate 251 is clamped on the upper end of the limit sleeve 252, the upper end of the limit sleeve 252 is provided with a limit hole 2521, and the limit bolt 253 passes through the limit hole 2521.

[0050] The beneficial effect of adopting the preferred scheme in the above embodiment is that when the rear suspension air spring 21 is damaged or the extreme road conditions exceed the safe travel of the rear suspension air spring 21, the corresponding travel limit assembly 25 starts to work to avoid accidents caused by the disconnection of the cab and the chassis. Specifically, the limit bolt 253 can slide up and down in the limit hole 2521. When sliding to the limit position, the corresponding rear upper bracket 22, travel limit assembly 25 and rear lower bracket 23 form a stable support to avoid accidents.

[0051] The corresponding travel limit assembly 25 is vertically connected to the middle portion of the rear upper bracket 22 and the middle portion of the rear lower bracket 23 , and can form a cross support with the corresponding stabilizer bar 24 to improve the stability of the support.

[0052] Example 7 like Figure 4 , Figure 5 as well as Figure 7 On the basis of embodiments 1-6, the two stroke limit assemblies 25 also include a limit shock absorbing sleeve 254, and each limit shock absorbing sleeve 254 is sleeved on the corresponding limit bolt 253.

[0053] The beneficial effect of adopting the preferred scheme in the above embodiment is that when the limiting bolt 253 slides up and down in the limiting hole 2521 to the limit position, the corresponding limiting shock-absorbing sleeve 254 can abut against the hole wall of the limiting hole 2521, forming a shock-absorbing and buffering effect between the limiting sleeve plate 252.

[0054] Based on the above embodiment, a limiting support sleeve 255 is sleeved on the inner side of the limiting shock absorbing sleeve 254. The limiting support sleeve 255 can be made of steel. The limiting support sleeve 255 is sleeved on the limiting bolt 253 to support the limiting shock absorbing sleeve 254 through the limiting support sleeve 255.

[0055] The limiting shock-absorbing sleeve 254 can be made of materials such as rubber and silicone.

[0056] Example 8 like Figure 1 , Figure 8 as well as Fig. 9 On the basis of Examples 1-7, the two front suspension frames 1 also include a front upper bracket 12, a front lower bracket 13 and a front connecting bolt 14 passing through the shock absorber cylinder 11, the front connecting bolt 14 passes through the lower end of the front upper bracket 12, and the front connecting bolt 14 and the shock absorber cylinder 11 are simultaneously passed through the upper end of the front lower bracket 13.

[0057] The beneficial effect of adopting the preferred solution in the above embodiment is that during installation, the two front upper brackets 12 are connected to the tractor cab, and the two front lower brackets 13 are connected to the chassis of the tractor, so as to achieve suspension support under the connection of the front connecting bolts 14.

[0058] As a specific solution of the above embodiment, the front upper bracket 12 is U-shaped and opens downward, and its two arms are clamped at both ends of the shock absorber cylinder 11.

[0059] Example 9 like Figure 8 and Fig. 9 On the basis of Examples 1-8, the front connecting bolts 14 are all sleeved with inner steel sleeves 15, the outer side of the inner steel sleeve 15 is sleeved with outer steel sleeves 16, the shock absorber cylinders 11 are all clamped on the outer side of the corresponding inner steel sleeves 15 and the inner side of the outer steel sleeves 16, and the outer steel sleeves 16 are passed through and fixedly connected to the upper end of the front lower bracket 13.

[0060] The beneficial effect of adopting the preferred solution in the above embodiment is that the inner steel sleeve 15 and the outer steel sleeve 16 clamp and support the shock-absorbing cylinder 11 to ensure that the shock-absorbing cylinder 11 forms a long-term, stable and effective shock-absorbing effect.

[0061] Based on the above embodiments, each shock absorbing cylinder 11 is circumferentially provided with a plurality of shock absorbing holes 111 so that during shock absorption, the vibration of the chassis can be further filtered through the shock absorbing holes 111, thereby reducing the transmission of chassis vibration to the cab and achieving noise reduction and shock absorption.

[0062] Example 10 The present invention also provides a tractor, comprising a chassis and a cab, including a semi-air suspension system as described in Examples 1-9, wherein the upper and lower ends of two front suspension frames 1 and two rear suspension frames 2 of the semi-air suspension system are respectively connected to the cab and the chassis.

[0063] By adopting the above-mentioned semi-air suspension suspension system, the front suspension is connected by a shock absorber cylinder 11, and the rear suspension is connected by a rear suspension air spring 21, so as to realize semi-suspension of the cab and improve the comfort of the cab at a low cost; the air pressure in the rear suspension air spring 21 is used as the bearing force to replace the traditional rubber block or mechanical spring, and the sound insulation and shock absorption effect is more obvious; in addition, the left and right height control valves 34 independently adjust the cab to solve the problem of large unilateral bouncing and tilting of the cab caused by the tire on one side of the cab passing through a pit or a bump.

[0064] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0065] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0066] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0067] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0068] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0069] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A semi-air suspension system for a tractor cab, characterized in that: The vehicle comprises two front suspension frames (1) and two rear suspension frames (2), wherein the two front suspension frames (1) and the two rear suspension frames (2) are arranged at intervals in the left-right direction, and the two front suspension frames (1) are respectively spaced apart from one of the rear suspension frames (2) in the front-back direction, the two front suspension frames (1) each comprise a shock absorbing cylinder (11), and the two rear suspension frames (2) each comprise a rear suspension air spring (21); The two rear suspension frames (2) also include a rear upper bracket (22), a rear lower bracket (23) and a stabilizer bar (24); the rear end of the rear upper bracket (22) is rotatably connected to the piston rod of the corresponding rear suspension air spring (21); the rear lower bracket (23) is located at the lower side of the rear upper bracket (22), and the rear end supports and is rotatably connected to the cylinder body of the corresponding rear suspension air spring (21); the two ends of the stabilizer bar (24) are rotatably connected to the front end of the rear upper bracket (22) and the rear end of the rear lower bracket (23), respectively; and the angle between the projection of the stabilizer bar (24) on the horizontal plane and the straight line where the front-rear direction is located is not less than 45° and not greater than 90°.

2. The semi-air suspension system for a tractor cab according to claim 1, characterized in that: The invention also comprises an air circuit (3), wherein the air circuit (3) comprises a main air pipe (31) whose air inlet end is used to connect to an air storage tank (4), a three-way valve (32) whose air inlet end is connected to an air outlet end of the main air pipe (31), and two bronchial pipes (33), wherein the air inlet ends of the two bronchial pipes (33) are respectively connected to one of the air outlet ends of the three-way valve (32), and the air outlet ends of the two bronchial pipes (33) are respectively connected to one of the rear suspension air springs (21).

3. The semi-air suspension system for a tractor cab according to claim 2, characterized in that: The air circuit (3) further comprises two height control valves (34) and two exhaust pipes (35), wherein the air inlet ends of the two height control valves (34) are respectively connected to the air outlet end of one of the bronchial pipes (33), and the air inlet ends of the two exhaust pipes (35) are respectively connected to the air outlet end of one of the height control valves (34), and the air outlet ends are respectively connected to one of the rear suspension air springs (21).

4. The semi-air suspension system for a tractor cab according to claim 1, characterized in that: Both ends of the stabilizing rod (24) are fixedly connected to a connecting tube (241), each connecting tube (241) is penetrated by a rear bolt (242), and each rear bolt (242) is sleeved with a rear shock-absorbing sleeve (243), and both ends of each connecting tube (241) are respectively connected to the front end of the rear upper bracket (22) and the rear end of the rear lower bracket (23) through the corresponding rear bolt (242).

5. The semi-air suspension system for a tractor cab according to claim 1, characterized in that: The two rear suspension frames (2) also include a travel limit assembly (25), and the two travel limit assemblies (25) each include a clamping plate (251) whose upper end is fixedly connected to the middle part of the rear upper bracket (22), a limit sleeve (252) whose lower end is fixedly connected to the middle part of the rear lower bracket (23), and a limit bolt (253) passing through the lower end of the clamping plate (251), the lower end of the clamping plate (251) is clamped on the upper end of the limit sleeve (252), the upper end of the limit sleeve (252) is provided with a limit hole (2521), and the limit bolt (253) passes through the limit hole (2521).

6. A semi-air suspension system for a tractor cab according to claim 5, characterized in that: The two travel limit assemblies (25) also include a limit shock absorbing sleeve (254), and each limit shock absorbing sleeve (254) is sleeved on the corresponding limit bolt (253).

7. A semi-air suspension system for a tractor cab according to any one of claims 1 to 6, characterized in that: The two front suspension frames (1) also include a front upper bracket (12), a front lower bracket (13) and a front connecting bolt (14) passing through the shock absorber tube (11); the front connecting bolt (14) passes through the lower end of the front upper bracket (12), and the front connecting bolt (14) and the shock absorber tube (11) are simultaneously passed through the upper end of the front lower bracket (13).

8. The semi-air suspension system for a tractor cab according to claim 7, characterized in that: The front connecting bolts (14) are each sleeved with an inner steel sleeve (15), the outer side of the inner steel sleeve (15) is sleeved with an outer steel sleeve (16), the shock-absorbing cylinder (11) is each clamped on the outer side of the corresponding inner steel sleeve (15) and the inner side of the outer steel sleeve (16), and the outer steel sleeve (16) is passed through and fixedly connected to the upper end of the front lower bracket (13).

9. A tractor comprising a chassis and a cab, characterized in that: It also includes a semi-air suspension system as described in any one of claims 1 to 8, wherein the upper and lower ends of the two front suspension frames (1) and the two rear suspension frames (2) of the semi-air suspension system are respectively connected to the cab and the chassis.

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