Tractor chassis transmission assembly

Abstract

The utility model belongs to the technical field of tractors, and discloses a tractor chassis transmission assembly which comprises a clutch box, a gearbox and a rear axle box which are sequentially installed together, a gearbox cover is fixedly installed on the top of the gearbox, and a main gear and auxiliary gear same-side control device is arranged on the gearbox cover. The two sides of the rear axle box are each provided with a driving shaft shell, a driving shaft extends out of each driving shaft shell, a mounting flange is mounted on each driving shaft through an adjustable mounting device, and an external lifting device is mounted on the rear axle box. Stepless adjustment of the wheel track of the rear hub is integrally achieved, the universality of the tractor is improved, the external lifting oil cylinder is adopted, the installation and maintenance operation process of the lifting device is simplified, meanwhile, operation of a main gear and an auxiliary gear on the same side is achieved, and driving operation of a driver is facilitated.

Description

Technical Field

[0001] The utility model belongs to the technical field of tractors, and in particular relates to a tractor chassis transmission assembly. Background Art

[0002] The tractor chassis is an important part of the tractor, mainly including the transmission assembly, steering assembly and tires, etc. They work together to enable the tractor to travel, turn, generate traction and withstand traction. Among them, the transmission assembly mainly includes the clutch, gearbox and drive axle, etc. When the driver releases the clutch pedal, the power of the diesel engine is transmitted to the gearbox through the clutch, and the gearbox adjusts the speed of the power and puts it on the drive axle, and then transmits the power to the wheels through the drive axle to generate traction and push the tractor forward.

[0003] In the Chinese invention patent with patent application number 202211188332.8, a tractor transmission system and a tractor are proposed. The main problems in this patent are: first, the wheelbase between the two rear wheels is fixed and cannot be adjusted, making it difficult to adapt to the agronomic operation needs of crops with different spacings, and the versatility is poor; second, the lifter uses a built-in horizontal lifting cylinder, and the lifter needs to be disassembled when the lifting structure is installed and repaired, and the installation and maintenance operations are complicated and troublesome; third, the main gear lever and auxiliary gear lever of the gearbox are respectively arranged on both sides of the gearbox. When the driver adjusts the high and low gears and 1, 2, 3, and 4 gears, the operator needs to be replaced, which is more troublesome to operate. Utility Model Content

[0004] The main technical problem to be solved by the utility model is to provide a tractor chassis transmission assembly, which realizes stepless adjustment of the rear wheel hub track, improves the versatility of the tractor, adopts an external lifting cylinder, simplifies the installation and maintenance operation process of the lifting device, and also realizes the same-side operation of the main and auxiliary gears, which facilitates the driver's driving operation.

[0005] In order to solve the above technical problems, the utility model provides the following technical solutions:

[0006] A tractor chassis transmission assembly comprises a clutch box, a gearbox and a rear axle box which are installed together in sequence, a gearbox cover is fixedly installed on the top of the gearbox, a main gear and a sub-gear same-side operating device is arranged on the gearbox cover, a drive shaft housing is respectively installed on both sides of the rear axle box, a drive shaft extends from each drive shaft housing, a mounting flange is installed on each drive shaft through an adjustable mounting device, and an external lifting device is installed on the rear axle box.

[0007] The following is a further optimization of the above technical solution by the utility model:

[0008] The adjustable mounting device includes a tapered sleeve assembly sleeved on the drive shaft, the tapered sleeve assembly is inserted between the inner hole surface of the mounting flange and the peripheral surface of the drive shaft, the inner hole surface of the mounting flange is matched with the outer peripheral surface of the tapered sleeve assembly, and the outer peripheral surface of the tapered sleeve assembly is pressed tightly against the inner hole surface of the mounting flange.

[0009] Further optimization: the tapered sleeve assembly includes a pair of tapered half sleeves sleeved on the drive shaft, the two tapered half sleeves are symmetrically arranged relative to the drive shaft, and a semi-circular flange is fixed to the large diameter end of each tapered half sleeve, and each semi-circular flange is fixedly connected to the mounting flange by a plurality of locking bolts.

[0010] Further optimization: a first keyway is provided on the inner wall of one of the tapered half-sleeves, a second keyway is provided on the circumferential surface of the drive shaft, the second keyway is arranged opposite to the first keyway, and flat keys are provided in both the first keyway and the second keyway.

[0011] Further optimization: the external lifting device includes a lifter fixedly installed on the top of the rear axle box, and lifting arms are respectively arranged on both sides of the lifter. One end of each lifting arm is rotatably installed on the lifter, and a lifting arm is fixed on each lifting arm. A lifting cylinder is hingedly installed between each lifting arm and the rear axle box, and each lifting cylinder is arranged on the outside of the rear axle box.

[0012] Further optimization: the rear ends of the two side walls of the rear axle box are fixedly installed with mounting seats, each mounting seat is fixedly installed with an articulated seat, and one end of each lifting cylinder away from the lifting arm is hingedly installed on the corresponding articulated seat.

[0013] Further optimization: the main and auxiliary gear same-side operating device includes a main gear support and an auxiliary gear support fixed to one side of the top of the gearbox cover, a main operating lever is movably mounted on the main gear support, and an auxiliary operating lever is movably mounted on the auxiliary gear support.

[0014] Further optimization: the main and auxiliary gear operating devices on the same side also include a main speed transmission rod and an auxiliary speed transmission rod arranged in parallel. The main speed transmission rod and the auxiliary speed transmission rod are both installed in the transmission cover along a horizontal sliding manner. The main speed transmission rod is connected to the main operating rod, and the auxiliary speed transmission rod is connected to the auxiliary operating rod. The main speed transmission rod and the auxiliary speed transmission rod are both equipped with speed lever heads.

[0015] Further optimization: a first mounting cavity and a second mounting cavity are provided at the bottom of the gearbox cover, one end of the main speed shift transmission rod and the auxiliary speed shift transmission rod are both extended into the first mounting cavity, the other end of the main speed shift transmission rod and the auxiliary speed shift transmission rod are both extended into the second mounting cavity, and the two speed shift lever heads are both arranged in the second mounting cavity.

[0016] The utility model adopts the above technical solution and has the following beneficial effects:

[0017] The utility model adopts the above technical scheme, has an ingenious conception and a reasonable structure, and realizes stepless adjustment of the position of the rear wheel hub assembly on the drive shaft through an adjustable mounting device, so as to achieve the purpose of freely adjusting the wheelbase between the two rear wheels, thereby making the tractor suitable for agronomic operations of crops with different spacings, thereby improving the operating flexibility and versatility of the tractor.

[0018] The adjustable mounting device realizes the movement and locking of the mounting flange on the drive shaft through a tapered bushing assembly. The operation is very simple and convenient. It is not only convenient for the operator to adjust the device, but also the manufacturing difficulty and cost of the adjustable mounting device are very low. It can effectively reduce the cost of tractor production and use, and achieve the purpose of reducing costs and increasing efficiency.

[0019] Compared with the structure of setting a horizontal lifting cylinder inside the lifter in the traditional tractor chassis, the utility model adopts an external lifting cylinder, which does not need to be disassembled and assembled on the lifter during installation and maintenance, thereby achieving the effect of simplifying the installation process and facilitating maintenance operations.

[0020] The utility model arranges the main operating lever and the auxiliary operating lever on the same side of the gearbox, thus realizing the same-side operation of the main gear and the auxiliary gear. The driver does not need to change hands during the operation, thus facilitating the driving operation of the driver.

[0021] The utility model is further described below in conjunction with the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure in the embodiment of the utility model;

[0023] Figure 2 for Figure 1 A side view schematic diagram of

[0024] Figure 3 This is a schematic diagram of the structure of the adjustable installation device in the embodiment of the utility model;

[0025] Figure 4 This is a schematic diagram of the installation of the tapered sleeve assembly and the mounting flange in the embodiment of the utility model;

[0026] Figure 5 This is a schematic structural diagram of a tapered sleeve assembly in an embodiment of the utility model;

[0027] Figure 6 This is a schematic diagram of the structure of the gearbox cover in the embodiment of the utility model;

[0028] Figure 7 for Figure 6 Schematic diagram of the top view.

[0029] In the figure: 1-clutch box; 2-gearbox; 21-gearbox cover; 211-first installation cavity; 212-second installation cavity; 3-rear axle box; 4-main and auxiliary gear same-side operating device; 41-main gear support; 42-auxiliary gear support; 43-main operating lever; 44-auxiliary operating lever; 45-main speed transmission rod; 46-auxiliary speed transmission rod; 47-speed lever head; 5-drive shaft housing; 51-drive shaft; 511-second keyway; 6-adjustable mounting device; 61-tapered bushing assembly; 611-tapered half bushing; 612-semicircular flange; 613-locking bolt; 614-first keyway; 62-flat key; 7-mounting flange; 8-external lifting device; 81-lifter; 82-lifting arm; 83-lifting arm; 84-lifting cylinder; 85-mounting seat; 86-articulated seat. DETAILED DESCRIPTION

[0030] like Figure 1-Figure 7 As shown together, a tractor chassis transmission assembly includes a clutch box 1, a gearbox 2 and a rear axle box 3 which are installed together in sequence, a gearbox cover 21 is fixedly installed on the top of the gearbox 2, and a main and auxiliary gear same-side operating device 4 is provided on the gearbox cover 21, a drive shaft housing 5 is respectively installed on both sides of the rear axle box 3, each drive shaft housing 5 has a drive shaft 51 extending therefrom, and each drive shaft 51 is installed with a mounting flange 7 through an adjustable mounting device 6, and an external lifting device 8 is installed on the rear axle box 3.

[0031] In this embodiment, the internal structures of the clutch box 1, the gearbox 2 and the rear axle box 3 are all prior art and well known to those skilled in the art, and will not be described in detail here.

[0032] In this embodiment, one end of the drive shaft 51 is transmission-connected to the corresponding rear axle power output shaft in the gearbox 2. The transmission connection structure between the drive shaft 51 and the rear axle power output shaft is prior art and is well known to ordinary technicians in this field, and will not be repeated here.

[0033] In this embodiment, the mounting flange 7 is used to mount a rear wheel hub assembly (not shown in the figure), and a rear wheel (not shown in the figure) is mounted on the corresponding rear wheel hub assembly.

[0034] like Figure 3-Figure 5 As shown together, the adjustable mounting device 6 includes a tapered sleeve assembly 61 sleeved on the drive shaft 51, the tapered sleeve assembly 61 is inserted between the inner hole surface of the mounting flange 7 and the peripheral surface of the drive shaft 51, the inner hole surface of the mounting flange 7 is adapted to the outer peripheral surface of the tapered sleeve assembly 61, and the outer peripheral surface of the tapered sleeve assembly 61 is pressed tightly against the inner hole surface of the mounting flange 7.

[0035] In this embodiment, the setting of the adjustable mounting device 6 realizes stepless adjustment of the mounting flange 7 on the drive shaft 51, so that the tractor can be adapted to the agronomic operation requirements of crops at different spacings, thereby improving the operating flexibility and versatility of the tractor.

[0036] In this embodiment, the locking and unlocking operations of the adjustable mounting device are very simple and convenient, which not only facilitates the operator to perform adjustment operations, but also the manufacturing difficulty and cost of the adjustable mounting device are very low, which can effectively reduce the cost of tractor production and use, thereby achieving the purpose of reducing costs and increasing efficiency.

[0037] Among them, the tapered sleeve assembly 61 includes a pair of tapered half sleeves 611 sleeved on the drive shaft 51, the two tapered half sleeves 611 are symmetrically arranged relative to the drive shaft 51, and each tapered half sleeve 611 is fixed with a semi-circular flange 612 at the large diameter end, and each semi-circular flange 612 is fixedly connected to the mounting flange 61 by a plurality of locking bolts 613.

[0038] In this embodiment, a plurality of through holes are arranged in a ring shape on the two semicircular flanges 612 and at the edge of the mounting flange 7 , and a locking bolt 613 is provided in each through hole of the mounting flange 7 and the corresponding through hole on the semicircular flange 612 .

[0039] In the present invention, the adjustment operation of the two rear wheel tracks is as follows:

[0040] First, loosen all the locking bolts 613 on the semicircular flange 612 to allow the tapered half-shaft sleeve 611 to move relative to the mounting flange 61, thereby releasing the locking effect between the tapered half-shaft sleeve 611 and the inner hole surface of the mounting flange 7 and the drive shaft 51.

[0041] Afterwards, the rear wheels mounted on the mounting flange 7 are adjusted in position according to actual needs, so that the wheelbase between the two rear wheels meets the agronomic operation needs of the corresponding crops.

[0042] Finally, all locking bolts 613 are tightened, so that the conical surface on the conical half-axle sleeve 611 and the conical inner hole surface on the mounting flange 61, and the inner circumferential surface of the conical half-axle sleeve 611 and the circumferential surface of the drive shaft 51 interact and lock, thereby fixing the rear wheel.

[0043] like Figure 3-Figure 5 As shown together, a first keyway 614 is provided on the inner wall of one of the conical half-sleeves 611, and a second keyway 511 is provided on the circumferential surface of the drive shaft 51. The second keyway 511 is arranged opposite to the first keyway 614, and a flat key 62 is provided in both the first keyway 614 and the second keyway 511.

[0044] In this embodiment, the second keyway 511 and the first keyway 614 are both provided with an interference fit tolerance with the flat key 62 to achieve the position limiting fixation of the tapered semi-axle sleeve 611 .

[0045] like Figure 1 and Figure 2 As shown together, the external lifting device 8 includes a lifter 81 fixedly installed on the top of the rear axle box 3, and lifting arms 82 are respectively arranged on both sides of the lifter 81. One end of each lifting arm 82 is rotatably installed on the lifter 81, and a lifting arm 83 is fixedly installed on each lifting arm 82. A lifting cylinder 84 is hingedly installed between each lifting arm 83 and the rear axle box 3, and each lifting cylinder 84 is arranged on the outside of the rear axle box 3.

[0046] Moreover, mounting seats 85 are fixedly installed at the rear ends of the two side walls of the rear axle box 3, and an articulated seat 86 is fixedly installed on each mounting seat 85. One end of each lifting cylinder 84 away from the lifting arm 83 is hingedly installed on the corresponding articulated seat 86.

[0047] In this embodiment, an external lifting cylinder 84 is used, which simplifies the installation and maintenance operation process and facilitates the maintenance operation.

[0048] like Figure 1 , Figure 6 and Figure 7 As shown together, the main and auxiliary gear operating device 4 on the same side includes a main gear support 41 and an auxiliary gear support 42 fixed to one side of the top of the transmission cover 21. A main operating lever 43 is movably mounted on the main gear support 41, and an auxiliary operating lever 44 is movably mounted on the auxiliary gear support 42.

[0049] The main and auxiliary gear side operating device 4 also includes a main speed transmission rod 45 and an auxiliary speed transmission rod 46 arranged in parallel. The main speed transmission rod 45 and the auxiliary speed transmission rod 46 are both installed in the transmission cover 21 along the horizontal sliding. The main speed transmission rod 45 is connected to the main operating rod 43, and the auxiliary speed transmission rod 46 is connected to the auxiliary operating rod 44. The main speed transmission rod 45 and the auxiliary speed transmission rod 46 are both equipped with a shift lever head 47.

[0050] In this embodiment, the main gear and the auxiliary gear are operated on the same side, and the driver does not need to change hands during the operation, thereby facilitating the driver's driving operation.

[0051] In the present utility model, the transmission connection structure between the main operating lever 43 and the main speed change transmission rod 45, the transmission connection structure between the auxiliary operating lever 44 and the auxiliary speed change transmission rod 46, the connection between the speed change lever head 47 and the main and auxiliary speed change structures, and the rebound structure of the main speed change transmission rod 45 and the auxiliary speed change transmission rod 46 are all prior arts, which are well known to ordinary technicians in this field and will not be repeated here.

[0052] A first mounting cavity 211 and a second mounting cavity 212 are provided at the bottom of the gearbox cover 21. One end of the main speed transmission rod 45 and the auxiliary speed transmission rod 46 extend into the first mounting cavity 211, and the other end of the main speed transmission rod 45 and the auxiliary speed transmission rod 46 extend into the second mounting cavity 212. Both speed shift lever heads 47 are arranged in the second mounting cavity 212.

[0053] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A tractor chassis transmission assembly, comprising a clutch box (1), a gearbox (2) and a rear axle box (3) which are sequentially mounted together, characterized in that: A gearbox cover (21) is fixedly mounted on the top of the gearbox (2), and a main gear and auxiliary gear same-side operating device (4) is arranged on the gearbox cover (21). A drive shaft housing (5) is respectively mounted on both sides of the rear axle box (3), and a drive shaft (51) extends from each drive shaft housing (5). A mounting flange (7) is mounted on each drive shaft (51) via an adjustable mounting device (6). An external lifting device (8) is mounted on the rear axle box (3).

2. A tractor chassis transmission assembly according to claim 1, characterized in that: The adjustable mounting device (6) comprises a tapered sleeve assembly (61) sleeved on the drive shaft (51); the tapered sleeve assembly (61) is inserted between the inner hole surface of the mounting flange (7) and the peripheral surface of the drive shaft (51); the inner hole surface of the mounting flange (7) is matched with the outer peripheral surface of the tapered sleeve assembly (61); and the outer peripheral surface of the tapered sleeve assembly (61) is pressed tightly against the inner hole surface of the mounting flange (7).

3. A tractor chassis transmission assembly according to claim 2, characterized in that: The tapered shaft sleeve assembly (61) comprises a pair of tapered half shaft sleeves (611) sleeved on the drive shaft (51), the two tapered half shaft sleeves (611) being symmetrically arranged relative to the drive shaft (51), a semi-circular arc flange (612) being fixed to the large diameter end of each tapered half shaft sleeve (611), and each semi-circular arc flange (612) being fixedly connected to the mounting flange (7) via a plurality of locking bolts (613).

4. A tractor chassis transmission assembly according to claim 3, characterized in that: A first keyway (614) is provided on the inner wall of one of the conical half-shaft sleeves (611), a second keyway (511) is provided on the circumferential surface of the drive shaft (51), the second keyway (511) is arranged opposite to the first keyway (614), and a flat key (62) is provided in both the first keyway (614) and the second keyway (511).

5. The tractor chassis transmission assembly according to claim 1, characterized in that: The external lifting device (8) comprises a lifter (81) fixedly mounted on the top of the rear axle box (3), a lifting arm (82) is respectively arranged on both sides of the lifter (81), one end of each lifting arm (82) is rotatably mounted on the lifter (81), a lifting arm (83) is fixed on each lifting arm (82), a lifting cylinder (84) is hingedly mounted between each lifting arm (83) and the rear axle box (3), and each lifting cylinder (84) is arranged on the outside of the rear axle box (3).

6. A tractor chassis transmission assembly according to claim 5, characterized in that: The rear ends of both side walls of the rear axle box (3) are fixedly mounted with mounting seats (85), each mounting seat (85) is fixedly mounted with an articulated seat (86), and one end of each lifting cylinder (84) away from the lifting arm (83) is hingedly mounted on the corresponding articulated seat (86).

7. A tractor chassis transmission assembly according to claim 1, characterized in that: The main and auxiliary gear same-side operating device (4) comprises a main gear support (41) and an auxiliary gear support (42) fixed to one side of the top of the gearbox cover (21); a main operating lever (43) is movably mounted on the main gear support (41); and an auxiliary operating lever (44) is movably mounted on the auxiliary gear support (42).

8. A tractor chassis transmission assembly according to claim 7, characterized in that: The main and auxiliary gear same-side operating device (4) further comprises a main speed transmission rod (45) and an auxiliary speed transmission rod (46) arranged in parallel, the main speed transmission rod (45) and the auxiliary speed transmission rod (46) are both mounted in a horizontal sliding manner in the gearbox cover (21), the main speed transmission rod (45) is transmission-connected to the main operating rod (43), the auxiliary speed transmission rod (46) is transmission-connected to the auxiliary operating rod (44), and a speed lever head (47) is mounted on the main speed transmission rod (45) and the auxiliary speed transmission rod (46).

9. A tractor chassis transmission assembly according to claim 8, characterized in that: A first mounting cavity (211) and a second mounting cavity (212) are provided at the bottom of the gearbox cover (21); one end of the main speed change transmission rod (45) and the auxiliary speed change transmission rod (46) extend into the first mounting cavity (211); the other ends of the main speed change transmission rod (45) and the auxiliary speed change transmission rod (46) extend into the second mounting cavity (212); and the two speed change lever heads (47) are arranged in the second mounting cavity (212).

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