CN219903939U - Tractor rear axle structure with changeable wheel track - Google Patents

Abstract

The utility model relates to the technical field of agricultural and forestry machinery, in particular to a tractor rear axle structure with a variable wheel track. The transmission comprises a transmission case, a half shaft arranged at the output end of the transmission case and a half pipe sleeved on the half shaft, wherein the outer end of the half shaft penetrates through and is inserted into the input end of the transmission case, the output end of the transmission case is provided with a travelling wheel, the inner end of the half pipe is provided with an inner end flange, the outer end of the half pipe is provided with an outer end flange, the inner end flange is fixedly connected onto the outer wall of the transmission case through a bolt, and the outer end flange is fixedly connected onto the outer wall of the transmission case; the half shaft is rotatably supported on the transmission case through a bearing, the outer wall of the half shaft is provided with an axially arranged key groove, and an input end gear in the transmission case is sleeved on the half shaft and is fixed by a flat key arranged in the key groove so that the input end gear can axially move on the half shaft but cannot rotate around the half shaft. The stress structure is reasonable, the half shaft is not influenced by longitudinal force, the application range of the tractor is improved, and the service life of the half shaft is prolonged.

Description

Tractor rear axle structure with changeable wheel track

Technical Field

The utility model relates to the technical field of agricultural and forestry machinery, in particular to a tractor rear axle structure with a variable wheel track.

Background

The farm and forestry tractor has complex working environment and high requirement on the passing capacity of the tractor. For example, in the operations of hilling green Chinese onion and fertilizing orchards, the rear wheel of the tractor is required to be just pressed on the ridges, so that the wheel distance of the tractor is required to be consistent with the spacing of the ridges, but the spacing of the ridges in different areas is not uniform due to the difference of varieties and planting habits of crops, so that the wheel distance of the rear wheel of the tractor can be required to be properly adjusted according to the spacing of the ridges. Chinese patent 2017213381585 discloses a high-clearance four-wheel adjustable track type tractor, the publication number is CN207257250U, in order to realize the adjustable track of the tractor, the outer end of a half shaft is connected with a sliding shaft with a sliding groove through a flange plate, the sliding shaft becomes an extension section of the half shaft, and meanwhile, a tire is arranged on the sliding shaft, and the position of the tire on the sliding shaft is adjustable, so that the adjustable track is realized. However, after the technical scheme is adopted, the weight of the tractor is pressed on the half shaft, the half shaft is required to bear rotating torque and longitudinal pressure in the running process of the tractor, the strength requirement on the half shaft is high, and the half shaft is easy to bend or even break. In addition, since the tires are mounted directly on the sliding axle, i.e., on the extension of the half axle, the ground clearance of the tractor is limited by the radius of the tire, and thus the purported high ground clearance effect thereof is not achieved.

Disclosure of Invention

In order to solve the problems in the prior art, the utility model provides the tractor rear axle structure with the variable wheel track, which has the advantages of reasonable stress structure, no influence of longitudinal force on the half axle and large ground clearance.

The aim of the utility model can be achieved by the following technical scheme: the utility model provides a tractor rear axle structure of variable wheel track, includes the gearbox, installs the semi-axis at the gearbox output, the semi-tube of suit outside the semi-axis, the outer end of semi-axis runs through the input of cartridge at the gearbox, the walking wheel is installed to the output of gearbox, the semi-tube inner is provided with inner ring flange, and the semi-tube outer end is provided with outer ring flange, inner ring flange passes through bolt fixed connection on the outer wall of gearbox, outer ring flange fixed connection is on the outer wall of gearbox; the half shaft is rotatably supported on the transmission case through a bearing, the outer wall of the half shaft is provided with an axially arranged key groove, and an input end gear in the transmission case is sleeved on the half shaft and is fixed by a flat key arranged in the key groove so that the input end gear can axially move on the half shaft but cannot rotate around the half shaft.

After adopting above-mentioned scheme, the weight of tractor is born by the semicircle, and the semi-axis only bears the moment of torsion of rotation and does not bear fore-and-aft pressure, and whole atress is rational in infrastructure, in addition, installs the walking wheel of tractor at the output of transmission case, and the high clearance that leaves of higher transmission case can be realized.

Preferably, a cushion block is arranged between the outer end flange plate and the outer wall of the transmission case, a through hole for accommodating the half shaft is arranged in the center of the cushion block, two ends of the cushion block are provided with butt joint surfaces for respectively butt-jointing the outer end flange plate and the outer wall of the transmission case, and screw holes are formed in the butt joint surfaces of the cushion block.

After the scheme is adopted, the thickness of the cushion block is increased, and different track sizes can be realized by selecting cushion blocks with different thicknesses.

Preferably, the screw holes on the cushion block are through holes penetrating through the two butt joint surfaces.

After the scheme is adopted, the outer end flange plate, the cushion block and the transmission case can be connected by adopting a long bolt.

Preferably, the screw hole on the cushion block is a blind hole with internal threads.

After the scheme is adopted, two bolts can be adopted to be respectively installed from two ends of the cushion block.

Preferably, the middle section of the half pipe is of a tubular structure, and two ends of the half pipe are respectively connected with the inner end flange plate and the outer end flange plate through horn mouths.

After the scheme is adopted, the flanges at the two ends of the half pipe are larger in diameter, firm in connection and capable of bearing larger external force, and meanwhile, the larger flanges are convenient to install and operate.

Preferably, the outer contour of the half pipe is cylindrical or equilateral polygon prism, a convex rib is arranged on the outer wall of the half pipe, the convex rib is of an equilateral quadrangular structure, and screw holes are arranged on four side surfaces of the convex rib.

After the scheme is adopted, the screw holes on the side surfaces of the quadrangular prism can be used for installing components such as a brake pedal and a driver seat protection frame, and the components can be conveniently and fixedly installed.

The comprehensive effects brought by the utility model include:

the tractor ground clearance is no longer limited to the radius of the tire, and a high ground clearance can be achieved.

The wheel tread of the tractor is changed through cushion blocks with different thicknesses so as to adapt to the spacing of different ridges and improve the applicability of field operation.

The half axle does not bear the weight of the tractor, effectively prolongs the service life of the half axle, and can prevent the half axle from bending deformation due to radial force.

Drawings

Fig. 1 is a schematic perspective view of an embodiment of the present utility model.

Fig. 2 is a schematic diagram of the front structure of the embodiment of fig. 1.

Fig. 3 is a schematic view of the embodiment of fig. 2 in partial cross-section.

FIG. 4 is a schematic diagram of an embodiment with a spacer.

Fig. 5 is a schematic view of another embodiment with a spacer.

Fig. 6 is a schematic perspective view of a half pipe according to the present utility model.

Detailed Description

The utility model is further described below with reference to the drawings and examples.

As shown in fig. 1 and 2, the tractor rear axle structure with the variable wheel track comprises a gearbox 1, a half axle 2 inserted into the output end of the gearbox 1 and a half pipe 3 sleeved outside the half axle 2. The half shaft is commonly called a drive shaft, and is a shaft connecting a differential and a drive wheel, and is commonly called a half shaft because it is symmetrically disposed on both sides of a transmission case, and functions to transmit torque between a transmission case speed reducer and the drive wheel. Fig. 1 and 2 are simplified schematic views showing only one half-shaft, and actually another half-shaft at the other symmetrical position of the transmission 1. The half pipe is a short term of a half shaft sleeve, is usually made of spheroidal graphite cast iron or seamless steel pipe, is sleeved outside the half shaft, and is used for protecting the half shaft and supporting the weight of a vehicle body.

The outer end of the half shaft 2 is inserted into the input end of the transmission case 4, and the traveling wheel 5 is installed at the output end of the transmission case 4. The torque of the half shaft 2 is transmitted to the transmission case 4 from the input end, and then is transmitted to the travelling wheel 5 through a transmission mechanism in the transmission case 4, so that the travelling wheel 5 is driven to rotate.

As shown in fig. 3, an inner end flange 31 is arranged at the inner end of the half pipe 3, an outer end flange 32 is arranged at the outer end of the half pipe 3, the inner end flange 31 is fixedly connected to the outer wall of the gearbox 1 through bolts, and the outer end flange 32 is fixedly connected to the outer wall of the transmission case 4; the half shaft 2 is rotatably supported on the gear box 4 by means of bearings 6. Bearing 6 is embedded at the position of the joint of half pipe 3 and transmission case 4 to the shell part of transmission case 4, and half shaft 2 is installed at the center of bearing 6 point as the input end of transmission case 4, so that transmission case 1 can transmit torque to the input end of transmission case 4 through half shaft 2.

In addition, the outer wall of the half shaft 2 is provided with a key groove which is axially arranged, and the length of the key groove can be set according to the requirement so as to meet the range of wheel tread variation. In this embodiment, a row of transmission gears which are normally meshed in series are arranged in the transmission case 4, and of course, the transmission gears can also be connected between the input end gear 41 and the travelling wheel 5 in the transmission case 4 through a chain or a transmission shaft, and these transmission structures are all conventional in the art and will not be described in detail herein. The input gear 41 in the gear box 4 is fitted over the half shaft 2 and the input gear 41 is fixed by a flat key fitted in a key groove so as to be axially movable on the half shaft 2 but not rotatable around the half shaft 2. As shown in fig. 3 and 4, before the outer flange 32 is not connected to the transmission case 4, the input gear 41 may move axially on the axle shaft 2 along with the transmission case 4, and once the outer flange 32 is mounted to the transmission case 4, the input gear 41 is limited by the bearings 6 on the left and right sides and cannot move axially any more, and can only rotate along with the axle shaft 2.

When the wheel tread needs to be increased, the distance between the transmission case 4 and the gearbox 1 can be increased by adding a cushion block between the outer end flange plate 32 and the transmission case 4, so that the wheel tread is increased. As shown in fig. 4 and 5, a cushion block 7 is arranged between the outer end flange 32 and the outer wall of the transmission case 4, a through hole for accommodating the half shaft 2 is arranged in the center of the cushion block 7, two ends of the cushion block 7 are respectively provided with a butt joint surface for butt joint of the outer end flange 32 and the outer wall of the transmission case 4, and screw holes are arranged on the butt joint surface of the cushion block 7.

The connection between the cushion block 7 and the transmission case 4 can have two structures, as shown in fig. 4, and the screw holes on the cushion block 7 are through holes penetrating through two butt joint surfaces. At this time, a screw hole with internal threads is drilled on the outer wall of the transmission case 4, and long bolts penetrate through the outer end flange plate 32 and then penetrate through the screw hole on the cushion block 7 to be screwed into the screw hole on the transmission case 4, so that the three parts can be connected together. Of course, this connection method can also be used if a matching flange is provided on the outer wall of the gearbox 4 alone. As shown in fig. 5, in another installation structure of the cushion block 7 of the present utility model, the screw hole on the cushion block 7 is a blind hole with internal threads. At this time, a box flange 8 needs to be separately arranged on the transmission box 4, and the box flange 8 is separated from the outer wall of the transmission box 4 by a distance, the distance between the box flange and the outer wall of the transmission box 4 is based on the condition that bolts can be installed and operation tools are convenient, the box flange and the outer wall of the transmission box 4 are connected by adopting a tubular structure, one group of bolts penetrate through an outer end flange 32 to be screwed into a screw hole on the inner side of the cushion block 7, and the other group of bolts penetrate through the box flange 8 to be screwed into a screw hole on the outer side of the cushion block 7. As shown in fig. 6, the middle section of the half pipe 3 is in a tubular structure, and two ends of the half pipe 3 are respectively connected with an inner end flange 31 and an outer end flange 32 through a bell mouth. Therefore, the diameter of the flange plate is larger, and the assembly operation is convenient. In addition, the outer contour of the half pipe 3 is cylindrical or equilateral polygonal prism, the outer wall of the half pipe 3 is provided with a convex rib 33, the convex rib 33 is of an equilateral quadrangular prism structure, and four sides of the convex rib 33 are provided with screw holes. The ribs 33 create four planar mounting surfaces on the circular contoured half tube 3 that can be used to mount a driver's seat guard, brake pedal, or other component.

The structures, proportions, sizes, etc. shown in the drawings attached hereto are for illustration purposes only and are not intended to limit the scope of the utility model, which is defined by the claims, but rather by the claims. Also, the terms such as "upper," "lower," "left," "right," "middle," and "a" and the like recited in the present specification are merely for descriptive purposes and are not intended to limit the scope of the utility model, but are intended to provide relative positional changes or modifications without materially altering the technical context in which the utility model may be practiced. The utility model has been described above with reference to preferred embodiments, but the scope of the utility model is not limited thereto, and any and all technical solutions falling within the scope of the claims are within the scope of the utility model. Various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the utility model. In particular, the technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict.

Claims (6)

1. The utility model provides a tractor rear axle structure of variable wheel track, includes gearbox (1), cartridge semi-axis (2) at gearbox (1) output, suit half pipe (3) outside semi-axis (2), the outer end of semi-axis (2) runs through the input of cartridge at gearbox (4), walking wheel (5) are installed to the output of gearbox (4), its characterized in that: the inner end of the half pipe (3) is provided with an inner end flange plate (31), the outer end of the half pipe (3) is provided with an outer end flange plate (32), the inner end flange plate (31) is fixedly connected to the outer wall of the gearbox (1) through bolts, and the outer end flange plate (32) is fixedly connected to the outer wall of the gearbox (4); the half shaft (2) is rotatably supported on the transmission case (4) through a bearing (6), an axially arranged key groove is formed in the outer wall of the half shaft (2), and an input end gear (41) in the transmission case (4) is sleeved on the half shaft (2) and can axially move on the half shaft (2) but cannot rotate around the half shaft (2) through a flat key fixed input end gear (41) arranged in the key groove.

2. The tractor rear axle structure with the variable wheel track according to claim 1, characterized in that a cushion block (7) is arranged between the outer end flange plate (32) and the outer wall of the transmission case (4), a through hole for accommodating the half shaft (2) is arranged in the center of the cushion block (7), two ends of the cushion block (7) are respectively provided with a butt joint surface for butt joint of the outer end flange plate (32) and the outer wall of the transmission case (4), and screw holes are arranged on the butt joint surface of the cushion block (7).

3. The tractor rear axle structure with the variable wheel track according to claim 2, wherein the screw holes on the cushion block (7) are through holes penetrating through two butt joint surfaces.

4. The tractor rear axle structure with the variable wheel tread according to claim 2, characterized in that the screw hole on the cushion block (7) is a blind hole with internal threads.

5. The tractor rear axle structure with the variable wheel track according to any one of claims 1 to 4, wherein the middle section of the half pipe (3) is of a tubular structure, and two ends of the half pipe (3) are respectively connected with an inner end flange (31) and an outer end flange (32) through a bell mouth.

6. The tractor rear axle structure with the variable wheel tread according to claim 5, wherein the outer contour of the half pipe (3) is cylindrical or equilateral polygonal, ribs (33) are arranged on the outer wall of the half pipe (3), the ribs (33) are of an equilateral quadrangular structure, and screw holes are arranged on four sides of the ribs (33).