Rear axle housing structure and loading machine

Abstract

The utility model relates to the technical field of loader rear axle housings, and discloses a rear axle housing structure and a loader, the rear axle housing comprises a rear axle housing, the rear axle housing comprises a middle box body, two sides of the middle box body are communicated with axle cylinder structures, a driving motor is fixed in each axle cylinder structure, and a hub reduction gear is arranged at the outer end of each axle cylinder structure. The output end of the driving motor is connected with a wheel through a hub reduction gear, and a threading hole is formed in the middle box body; the internal space of the rear axle cylinder is fully utilized, the driving motor is installed in the axle cylinder structure, the output end of the driving motor directly drives the wheels through the hub reduction gear, the installation space of an external output shaft is saved, the overall space proportion is small, the structural arrangement is simple, assembling is easy, and the weight of a vehicle body is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of rear axle housings of loaders, in particular to a rear axle housing structure and a loader. Background Art

[0002] The transmission system of the transmission loader is composed of diesel engine-torque converter-gearbox-drive shaft-front and rear axles-front and rear wheels. The diesel engine power is transmitted to the drive shaft. The drive shaft cooperates with the front axle power input end through the front drive shaft and cooperates with the rear axle input end through the rear drive shaft. For hybrid loaders, for example, CN117141220A discloses a loader power system, in which the motor is arranged at the bottom position of the rear side of the frame, the motor is provided with a second output shaft, the second output shaft extends in the front and rear direction, the second output shaft is provided with a one-way wheel, and is connected to the front drive axle. This motor is connected to the bridge housing through an external output shaft. On the one hand, the motor is arranged at the bottom of the rear side of the frame, and the external output shaft is located between the front and rear axles under the vehicle body as a whole, which occupies a large space; on the other hand, the inside of the bridge housing needs to be configured with gear sets, wheel drive shafts and other structures, which are complicated to assemble, have many transmission links, will have more power losses, and make the vehicle body have a large weight. Utility Model Content

[0003] In view of the shortcomings of the prior art, the purpose of the utility model is to provide a rear axle housing structure and a loader, which fully utilize the internal space of the rear axle tube, install the drive motor inside the axle tube structure, and directly drive the wheels through the wheel-side reducer at the output end of the drive motor, thus saving the installation space of the external output shaft, taking up a small overall space, and having a simple structural setting and simple assembly, which also reduces the weight of the vehicle body.

[0004] In order to achieve the above purpose, the utility model is implemented through the following technical solutions:

[0005] In a first aspect, a rear axle housing structure includes a rear axle housing, wherein the rear axle housing includes an intermediate box body, and the two sides of the intermediate box body are connected to a bridge tube structure, a drive motor is fixed inside the bridge tube structure, a wheel-side reducer is provided at the outer end of the bridge tube structure, and the output end of the drive motor is connected to the wheel through the wheel-side reducer, thereby making full use of the internal space of the rear axle tube, installing the drive motor inside the bridge tube structure, and the output end of the drive motor directly drives the wheel through the wheel-side reducer, and a threading hole is provided at the intermediate box body.

[0006] As a further implementation method, the intermediate box body is a cubic structure with openings on the left and right sides, and the bridge tube structure is welded at the openings.

[0007] As a further implementation, the bridge cylinder structure includes a cylinder, and a bridge cylinder flange is provided at one end of the cylinder away from the middle box body.

[0008] As a further implementation method, an annular groove is provided at the inner ring of the bridge tube flange, and bolt holes are provided on the annular groove. The annular groove is used for fixed connection with the flange on the drive motor.

[0009] As a further implementation method, a mounting hole is provided on the bridge barrel flange for installing a wheel-side reducer.

[0010] As a further implementation method, a limiting ring is processed on the inner side of the cylinder close to one end of the middle box body, and the limiting ring is used to abut the end of the driving motor.

[0011] As a further implementation, a maintenance hole is provided on the bottom surface of the intermediate box body, and a threading hole is provided on the top surface of the intermediate box body.

[0012] As a further implementation method, the front side and the rear side of the intermediate box are rotatably connected to the middle position of the swing frame, and the two ends of the swing frame are fixedly connected to the rear frame.

[0013] As a further implementation method, the bridge tube structure includes a first bridge tube and a second bridge tube welded as one body with the middle box body, and oil drain plugs are provided at the bottom of the first bridge tube and the second bridge tube.

[0014] In a second aspect, a loader is provided, wherein the loader is a hybrid loader, and the hybrid loader comprises any of the rear axle housing structures described above, wherein an engine on the hybrid loader works and supplies power to a drive motor through a generator.

[0015] The beneficial effects of the above utility model are as follows:

[0016] 1. The utility model makes full use of the internal space of the rear axle tube and installs the drive motor inside the axle tube structure. The output end of the drive motor directly drives the wheel through the wheel-side reducer, which saves the installation space of the external output shaft. The overall space occupancy is small, the structure is simple, the assembly is simple, and the weight of the vehicle body is also reduced.

[0017] 2. The power structure setting mode of the utility model reduces the number of power transmission links and greatly reduces the power loss. The engine of the loader can run at a constant economic speed, improve the operating efficiency and extend the engine life.

[0018] 3. The annular groove and the limiting ring of the utility model can effectively fix the drive motor and prevent the drive motor from loosening.

[0019] 4. The maintenance hole of the utility model can be set to repair the internal structure of the bridge housing through the intermediate box.

[0020] 5. The top surface of the middle box of the utility model is provided with a threading hole, through which the wires on the driving motor can be led out. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0022] Figure 1 This is a schematic diagram of the rear axle housing structure in an embodiment of the utility model;

[0023] Figure 2 It is a top view of the rear axle housing structure in an embodiment of the utility model.

[0024] In the figure: the distances or sizes between parts are exaggerated to show the positions of various parts, and the schematic diagram is for reference only.

[0025] Among them: 1. middle box, 2. first bridge tube, 3. second bridge tube, 4. swing frame; 11. threading hole, 21. bridge tube flange, 22. annular groove, 41. swing arm. DETAILED DESCRIPTION

[0026] It should be noted that the following detailed descriptions are all illustrative and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0027] Embodiment 1

[0028] In a typical implementation of the present invention, reference is made to Figure 1-Figure 2 As shown, a rear axle housing structure includes a rear axle housing, and the rear axle housing includes an intermediate case 1. The intermediate case 1 is connected to a bridge tube structure on both sides, a drive motor is fixed inside the bridge tube structure, a wheel-side reducer is provided at the outer end of the bridge tube structure, the output end of the drive motor is connected to the wheel through the wheel-side reducer, and a threading hole 11 is provided at the intermediate case.

[0029] like Figure 1 As shown, the middle box 1 is a cubic structure, the left and right sides of the middle box 1 are open, and the bridge tube structure is welded at the openings. The bridge tube structure includes a first bridge tube 2 and a second bridge tube 3, and the first bridge tube 2 and the second bridge tube 3 are respectively welded at the left and right openings of the middle box 1.

[0030] The first bridge tube 2 and the second bridge tube 3 have the same structure, both comprising a cylinder, and the end of the cylinder away from the middle box body is provided with a bridge tube flange 21. A driving motor (not shown in the figure) is fixed in the first bridge tube 2 and the second bridge tube 3 on the left and right sides.

[0031] The drive motor is connected to the wheels through the wheel-side reducer to directly drive the wheels to rotate. By installing the drive motor in the bridge tube structure of the rear axle housing, there is no need to set up an external output shaft, which saves space under the vehicle body and reduces the weight of the vehicle body. In addition, the drive motor directly drives the wheels through the wheel-side reducer, which has fewer transmission links and less power loss, thereby improving the operating efficiency of the loader.

[0032] In order to achieve effective fixed installation of the wheel reducer, the bridge flange 21 is provided with mounting holes for mounting the wheel reducer through bolt assemblies. Figure 1 As shown, an annular groove 22 is provided at the inner circle of the bridge tube flange 21, and a circle of bolt holes is provided on the annular groove 22. The annular groove 22 is used to be fixedly connected with the flange on the driving motor by bolts.

[0033] It is understandable that a motor flange is provided on the periphery of one end of the driving motor, the size of the motor flange matches the size of the annular groove, and the thickness of the motor flange is less than the depth of the annular groove. The other end of the driving motor extends to the opening position of the middle box.

[0034] The first bridge tube 2, the second bridge tube 3 and the intermediate box body 1 are welded into an integrated structure. In order to fix the second end of the driving motor, a limit block is provided on the circumference of the second end of the driving motor, and a limit ring is processed on the inner side of the cylinder close to one end of the intermediate box body. The distance L1 from the limit ring to the annular groove is adapted to the distance L2 from the limit block to the motor flange. When installing the driving motor, insert the driving motor into the bridge tube from the outer end of the bridge tube, and the limit block on the driving motor abuts against the limit ring for limiting. At this time, the motor flange abuts against the annular groove, and the annular groove and the motor flange are fixed by bolts to achieve fixed installation of the driving motor.

[0035] After installing the drive motor, install the wheel-side reducer on the bridge flange 21, and then install the wheel. The wheel is connected to the output end of the wheel-side reducer, and the input end of the wheel-side reducer is connected to the output end of the drive motor.

[0036] like Figure 1 As shown, the bottom surface of the intermediate box 1 is provided with a maintenance hole, and the threading hole 11 is provided on the top surface of the intermediate box. The threading hole 11 is provided for leading out the wires on the drive motor. The maintenance hole is provided for easy maintenance of the internal structure of the intermediate box.

[0037] The front and rear sides of the middle box body 1 are rotatably connected to the middle position of the swing frame 4. The two ends of the swing frame 4 are swing arms 41, which are fixedly connected to the rear frame through bolt holes on the swing arms 41.

[0038] It is understandable that the intermediate housing 1 of this embodiment is an integrally welded structure with the first bridge tube 2 and the second bridge tube 3. The first bridge tube 2 and the second bridge tube 3 are provided with drain plugs at the bottom for draining oil. The first bridge tube 2 and the second bridge tube 3 are on the same axis. The axis of the swing frame 4 is on the same plane as the axis of the bridge tube and is arranged perpendicular to each other. It is understandable that the front axle housing of the loader can also adopt the same structural form as the rear axle housing.

[0039] Embodiment 2

[0040] In a typical implementation of the present invention, reference is made to Figure 1 As shown, a loader is a hybrid loader, and the hybrid loader includes the rear axle housing structure of the first embodiment. The engine on the hybrid loader works and supplies power to the drive motor through the generator. The excess electric energy is stored in the battery. The engine generates electricity and supplies power to the drive motor in the existing technology. The engine can run at a constant economic speed and convert the electric energy into torque through the drive motor, input the wheel side to reduce speed, and drive the wheels. The engine running constantly has a long life, and the power loss is small during the operation of the loader. When the loader goes downhill, inertia and gravity can drive the loader. The drive motor is driven by the wheels and temporarily becomes a generator to replenish energy for the power system.

[0041] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A rear axle housing structure, characterized in that: It includes a rear axle housing, which includes an intermediate box body. Both sides of the intermediate box body are connected to the bridge tube structure. The drive motor is fixed inside the bridge tube structure. A wheel-side reducer is provided at the outer end of the bridge tube structure. The output end of the drive motor is connected to the wheel through the wheel-side reducer. A threading hole is provided at the intermediate box body.

2. A rear axle housing structure according to claim 1, characterized in that: The middle box body is in a cubic structure, with left and right side surfaces opened, and the bridge tube structure is welded at the openings.

3. A rear axle housing structure according to claim 2, characterized in that: The bridge cylinder structure comprises a cylinder, and a bridge cylinder flange is arranged at one end of the cylinder away from the middle box body.

4. A rear axle housing structure according to claim 3, characterized in that: An annular groove is provided at the inner circle of the bridge barrel flange, and bolt holes are provided on the annular groove. The annular groove is used for fixed connection with the flange on the driving motor.

5. The rear axle housing structure according to claim 3, characterized in that: The bridge barrel flange is provided with a mounting hole for mounting a wheel-side reducer.

6. The rear axle housing structure according to claim 3, characterized in that: A limiting ring is processed on the inner side of the cylinder near one end of the middle box body, and the limiting ring is used to abut against the end of the driving motor.

7. The rear axle housing structure according to claim 1, characterized in that: The bottom surface of the intermediate box body is provided with a maintenance hole, and the threading hole is provided on the top surface of the intermediate box body.

8. The rear axle housing structure according to claim 1, characterized in that: The front side and the rear side of the middle box body are rotatably connected to the middle position of the swing frame, and the two ends of the swing frame are fixedly connected to the rear frame.

9. The rear axle housing structure according to claim 1, characterized in that: The bridge tube structure comprises a first bridge tube and a second bridge tube which are welded as one body with the middle box body, and oil drain plugs are arranged at the bottom of the first bridge tube and the second bridge tube.

10. A loader, characterized in that: The loader is a hybrid loader, which includes the rear axle housing structure as described in any one of claims 1 to 9. The engine on the hybrid loader works and supplies power to the drive motor through the generator.

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