Transmission, wheel hub gear box for a wheel, and engineering vehicle

Abstract

This disclosure discloses a transmission device for wheels, a wheel-side gearbox, and an engineering vehicle. The transmission device includes: a housing; a hub rotatably connected to the housing, with a gear ring fixedly disposed within the hub; a main shaft assembly including a main shaft and a sun gear fixedly connected to the main shaft; and a secondary shaft assembly including a secondary shaft with a secondary gear and a travel gear fixedly connected to the secondary shaft, the secondary gear meshing with the sun gear and the travel gear meshing with the gear ring. By arranging the housing, hub, and the mutually cored main shaft assembly and secondary shaft assembly, and by having the gear ring disposed within the hub, and the secondary shaft assembly meshing with the gears via the travel gear, the structure of the transmission device for wheels can be made more compact.

Description

Technical Field

[0001] This disclosure generally relates to the field of gear transmission technology. More specifically, this disclosure relates to a transmission device for wheels, a wheel-side gearbox, and an engineering vehicle. Background Technology

[0002] In the field of wheel-side drive systems for construction machinery, planetary gear transmissions are widely used due to their superior transmission performance, typically employing multi-stage transmission structures to meet practical application requirements. However, existing planetary gear transmission assemblies have a large number of components. These numerous core parts not only increase the structural complexity and manufacturing cost of the wheel-side drive system but also require a large installation space, making it difficult to meet the design requirements of lightweight and compact wheel-side components in construction machinery. Therefore, while maintaining the same transmission ratio, there is an urgent need for an optimized planetary transmission solution that can reduce the number of core components and shrink the space occupied by the system, thereby addressing the shortcomings of existing technologies.

[0003] In view of this, there is an urgent need to provide a transmission device for wheels, a wheel-side gearbox, and an engineering vehicle, so that the structure of the transmission device for wheels can be made more compact. Utility Model Content

[0004] In order to at least address one or more of the technical problems mentioned above, this disclosure proposes, in several aspects, a transmission device for wheels, a wheel-side gearbox, and an engineering vehicle.

[0005] In a first aspect, this disclosure provides a transmission device for a wheel, comprising: a housing; a hub rotatably connected to the housing, and a gear ring fixedly disposed within the hub; a main shaft assembly including a main shaft and a sun gear fixedly connected to the main shaft; and a secondary shaft assembly including a secondary shaft and a secondary gear and a travel gear fixedly connected to the secondary shaft, the secondary gear meshing with the sun gear and the travel gear meshing with the gear ring. In some embodiments, the gear ring further includes two support bearings, which are axially disposed on both sides of the gear ring.

[0006] In some embodiments, a rotating bracket is further included, which is fixedly connected to the housing and defines a gear groove for accommodating the gear ring. Two support bearings are respectively fixedly disposed on the housing and the rotating bracket.

[0007] In some embodiments, an oil seal assembly is fitted onto the spindle, and the radially outer side of the oil seal assembly is sealed to the housing.

[0008] In some embodiments, the oil seal assembly further includes an end cap and an annular oil seal that mates with the end cap. The end cap includes a first ring and a second ring spaced apart along the axial direction, and the annular oil seal abuts against the radially inner side of the first ring.

[0009] In some embodiments, the end cap further includes an oil outlet extending radially outward, and the housing also has an oil passage communicating with the oil outlet, the oil passage being connected to the countershaft assembly.

[0010] In some embodiments, the end of the main shaft assembly with a sun gear and the end of the secondary shaft assembly with a travel gear are arranged axially away from each other.

[0011] In some embodiments, the housing is provided with a sealing shoulder extending axially toward the hub side along the main shaft, and the hub and the sealing shoulder overlap radially.

[0012] In a second aspect, this disclosure provides a wheel-side gearbox including a transmission device for a wheel according to the first aspect and several embodiments.

[0013] In a third aspect, this disclosure provides an engineering vehicle including a wheel-side gearbox according to the second aspect.

[0014] By providing the above-described transmission device for wheels, wheel-side gearbox, and engineering vehicle, and by setting up a housing, a hub, and a main shaft assembly and a secondary shaft assembly that are mutually cored, and by providing a gear ring inside the hub, and by having the secondary shaft assembly mesh with the travel gear, the structure of the transmission device for wheels can be made more compact. Attached Figure Description

[0015] The above and other objects, features, and advantages of exemplary embodiments of this disclosure will become readily apparent upon reading the following detailed description with reference to the accompanying drawings. In the drawings, several embodiments of this disclosure are illustrated by way of example and not limitation, and like or corresponding reference numerals denote like or corresponding parts, wherein: Figure 1 An exemplary cross-sectional view of a drive mechanism for a wheel, according to some embodiments of this disclosure, is shown; Figure 2 It shows Figure 1 A magnified view of part A in the middle; Figure 3 An exemplary cross-sectional view of an end cap for a drive system for a wheel, according to some embodiments of this disclosure, is shown. Figure 4 An exemplary cross-sectional view of an annular oil seal for a wheel drive system according to some embodiments of this disclosure is shown. Detailed Implementation

[0016] The technical solutions in the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this disclosure, not all of them. Based on the embodiments in this disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure.

[0017] It should be understood that the terms “comprising” and “including” used in this disclosure and claims indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0018] It should also be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of this disclosure. As used in this disclosure and claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used in this disclosure and claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes such combinations.

[0019] As used in this specification and claims, the term "if" may be interpreted, depending on the context, as "when," "once," "in response to determination," or "in response to detection." Similarly, the phrase "if determined" or "if [described condition or event] is detected" may be interpreted, depending on the context, as "once determined," "in response to determination," "once [described condition or event] is detected," or "in response to detection of [described condition or event]."

[0020] This disclosure provides a transmission device for wheels, which, by providing a housing, a hub, and a main shaft assembly and a secondary shaft assembly that are mutually cored, and by providing a gear ring inside the hub, and by having the secondary shaft assembly mesh with a traveling gear, enables a more compact structure for the transmission device for wheels.

[0021] The specific embodiments disclosed herein will now be described in detail with reference to the accompanying drawings.

[0022] See Figure 1 , Figure 1 An exemplary cross-sectional view of a drive mechanism for a wheel, according to some embodiments of this disclosure, is shown.

[0023] A transmission device for a wheel includes: a housing 1, a hub 3, a main shaft assembly 7, and a secondary shaft assembly 8. The hub 3 is rotatably connected to the housing 1, and a gear ring 13 is fixedly disposed within the hub 3. The main shaft assembly 7 includes a main shaft 71 and a sun gear 72 fixedly connected to the main shaft 71. The secondary shaft assembly 8 includes a secondary shaft 82 and a secondary gear 81 and a travel gear 83 fixedly connected to the secondary shaft 82. The secondary gear 81 meshes with the sun gear 72, and the travel gear 83 meshes with the gear ring 13. This transmission device can be installed at the wheels of transportation equipment such as mining vehicles. It is fixedly connected to the vehicle body and driven by the vehicle's drive mechanism, and driven by the vehicle's wheels. Thus, the transmission device receives transmission from the drive mechanism and drives the wheels to rotate.

[0024] Specifically, the housing 1 is a structural component for accommodating the internal gears and shaft assembly, and it is fixedly connected to the main structure of the vehicle. The hub 3 is generally cylindrical, rotatably connected to the housing 1 on one side and connected to the wheel on the other. A gear ring 13 is coaxially arranged inside the hub 3 and fixedly connected to it for receiving drive. The gear ring 13 has a through-hole 131 along its axial direction, and is fixed to the housing 1 by passing bolts 12 through the through-hole 131. The main shaft assembly 7 is a transmission mechanism located within the housing 1, with one side protruding from one end of the housing 1 for drive connection with the vehicle's drive mechanism, and a sun gear 72 fixedly mounted on the other side. The secondary shaft assembly 8 includes a secondary shaft 82 and a secondary gear 81 and a travel gear 83 fixedly mounted outside the secondary shaft 82. The secondary shaft 82 is parallel to the main shaft 71, the secondary gear 81 meshes with the sun gear 72, and the travel gear 83 meshes with the gear ring 13. Therefore, when the main shaft assembly 7 is driven to rotate by the vehicle's drive mechanism, it can drive the secondary shaft assembly 8 to rotate by means of the meshing of the sun gear 72 and the secondary gear 81. Furthermore, the secondary shaft assembly 8 drives the gear ring 13 to rotate through the meshing of its travel gear 83 with the gear ring 13, thereby causing the wheel hub 3, which is fixedly connected to the gear ring 13, to rotate relative to the housing 1. By placing both the main shaft assembly 7 and the secondary shaft assembly 8 inside the housing 1, and by having the travel gear 83 located inside the wheel hub 3 mesh with the gear ring 13, the structure of the transmission device for the wheel can be made more compact.

[0025] In this embodiment, two support bearings 4 are also included, which are axially arranged on both sides of the gear ring 13. By placing the two support bearings 4 on both sides of the gear ring 13, the stability of the meshing between the gear ring 13 and the traveling gear 83 can be improved through the support on both sides of the gear ring 13, and the load during the meshing of the gear ring 13 and the traveling gear 83 can be distributed, avoiding uneven wear or tilting of the gear ring 13. Further or optionally, the transmission device also includes a rotating bracket 5, which is fixedly connected to the housing 1 and defines a gear ring groove 140 for accommodating the gear ring 13. The two support bearings 4 are respectively disposed on the housing 1 and the rotating bracket 5. By fixing the rotating bracket 5 to the housing 1 and accommodating the gear ring 13 through the gear ring groove 140, the internal clearance of the transmission device can be reduced, making the device more compact and improving the lubrication effect. By placing the two support bearings 4 on the housing 1 and the rotating bracket 5 respectively, the coaxiality of the two support bearings 4 can be adjusted by fixing the rotating bracket 5 relative to the housing 1, reducing the misalignment caused by machining errors.

[0026] See also Figures 1 to 4 , Figure 2 It shows Figure 1 A magnified view of part A in the middle. Figure 3 An exemplary cross-sectional view of an end cap for a drivetrain for a wheel, according to some embodiments of this disclosure, is shown. Figure 4 An exemplary cross-sectional view of an annular oil seal for a wheel drive system according to some embodiments of this disclosure is shown. In this embodiment, an oil seal assembly is fitted onto a main shaft 71, and the radially outer side of the oil seal assembly is sealed to the housing 1. This oil seal assembly, disposed between the main shaft 71 and the housing 1, prevents internal lubricating oil leakage, ensuring effective transmission lubrication. Furthermore, it prevents external contaminants from entering, protecting internal precision components.

[0027] Further or optionally, the oil seal assembly also includes an end cap 16 and an annular oil seal 17 that mates with the end cap 16. The end cap 16 includes a first ring 167 and a second ring 161 spaced apart along the axial direction. The annular oil seal 17 abuts against the radially inner side of the first ring 167. The radially inner side of the first ring 167 is adjacent to the radially outer side of the annular oil seal 17 to enhance the internal sealing of the oil seal assembly and reduce axial leakage of lubricating oil. The second ring 161 is positioned adjacent to the radially outer side of the spindle 71 to further improve the sealing performance of the oil seal assembly. The end cap 16 also includes an oil outlet 168 and an oil drain 169 extending radially outward. The oil outlet 168 is located on the side of the first ring 167 opposite to the second ring 161, and the oil drain 169 is located between the first ring 167 and the second ring 161. The housing 1 also has an oil passage 102 communicating with the oil outlet 168 and the oil drain 169. The oil passage 102 is further connected to the sub-shaft assembly 8 radially along the main shaft 71. Thus, by means of the oil outlet 168 and the oil passage 102, lubricating oil can be supplied to the connection between the gear ring 13 and the sub-shaft assembly 8 without adding additional oil supply components or changing the structure of the oil seal assembly and the housing 1, thereby improving the lubrication effect. An oil slinger ring 174 is also provided on the annular oil seal 17, which protrudes radially outward. The position of the oil slinger ring 174 can be aligned with the oil outlet 168. By providing the oil slinger ring 174, when the main shaft 71 rotates, the annular oil seal 17 sleeved on the outside of the main shaft 71 can rotate with the main shaft 71, thereby directionally throwing the lubricating oil to the oil outlet 168 by means of the rotation of the oil slinger ring 174.

[0028] In this embodiment, the sun gear 72 is disposed at one axial end of the main shaft 71, and the travel gear 83 is disposed near one axial end of the countershaft 82. The end of the main shaft assembly 7 with the sun gear 72 and the end of the countershaft assembly 8 with the travel gear 83 are disposed axially opposite to each other. This makes the main shaft assembly 7 and the countershaft assembly 8 parallel to each other in the axial direction of the main shaft 71, forming a folded structure, reducing the overall axial length of the transmission device, and thus making the transmission device more compact.

[0029] Furthermore, by configuring the main shaft assembly 7 and the secondary shaft assembly 8 to form a folded structure, and by providing multiple bearings for support between the main shaft 71 and the housing 1 and the rotating bracket 5, the support structure portion of the housing 1 and the rotating bracket 5 used to support the bearings can be formed by the inner wall of the openings formed in the housing 1 and the rotating bracket 5. Specifically, the secondary shaft assembly 8 is provided with a first bearing 15 and a second bearing 19 spaced apart along the axial direction, while the housing 1 is provided with a first bearing hole 110 extending along the axial direction, and the rotating bracket 5 is provided with a second bearing hole 120 communicating with the first bearing hole 110. The side of the secondary shaft assembly 8 with the traveling gear extends into the second bearing hole 120 and the first bearing hole 110 in sequence parallel to the axial direction of the main shaft 71, such that the first bearing 15 abuts against the inner wall of the first bearing hole 110, and the second bearing 19 abuts against the inner wall of the second bearing hole 120. By arranging the main shaft assembly 7 and the secondary shaft assembly 8 into a folded structure, less material is required to form the housing 1 and the rotating bracket 5 supporting the first bearing 15 and the second bearing 19, thereby reducing production costs. Furthermore, a generally annular bolt clamping block assembly 10 is provided between the second bearing 19 and the secondary gear 81. The bolt clamping block assembly 10 is fixed to the rotating bracket 5 by bolts or other connecting members, and its two axial sides are respectively adjacent to the second bearing 19 and the secondary gear 81, allowing it to be used to adjust and limit the axial clearance of the second bearing 19, thereby limiting the axial float of the secondary shaft assembly 8.

[0030] Furthermore, a third bearing 18 may be provided on the radially outer side of the spindle assembly 7. The radially outer side of the third bearing 18 may abut against the inner wall of the third bearing hole 130 formed on the housing 1. The third bearing 18 can at least partially overlap with the first bearing 15 along the radial direction of the spindle, so that the side wall portion of the housing 1 used to support the first bearing 15 and the third bearing 18 is subjected to the pressure transmitted from both sides by the two bearings. The pressure on both sides can partially cancel each other out, thereby reducing the probability of local deformation of the housing due to bearing pressure.

[0031] Furthermore, a sealing shoulder 11 is provided on the housing 1, extending axially toward the hub 3 along the main shaft assembly 7, with the hub 3 and the sealing shoulder 11 overlapping radially. By providing this sealing shoulder 11, the overall sealing performance of the transmission device is further enhanced, preventing lubrication failure and preventing the ingress of foreign objects. In addition, a sealing ring assembly 14 may be provided radially inner to the sealing shoulder 11. This sealing ring assembly 14 includes two sealing rings that can rotate relative to each other and maintain sealing contact. The radially outer sides of the two sealing rings abut against the radially inner walls of the housing 1 and the hub 3, respectively, thereby further enhancing the sealing performance of the transmission device.

[0032] According to some embodiments of this disclosure, a transmission device for wheels is provided, which, by setting a housing, a hub, and a main shaft assembly and a secondary shaft assembly that are mutually cored, and by providing a gear ring in the hub and the secondary shaft assembly meshing with a traveling gear, enables the transmission device for wheels to have a more compact structure, making it particularly suitable for use in the confined space of wheel-side drive of engineering machinery, as a transmission device for speed reduction and torque increase to drive vehicles.

[0033] This disclosure also provides a wheel-side gearbox, including a transmission device for a wheel according to some embodiments of this disclosure, and a gear set and gearbox housing drivenly connected to the transmission device. Furthermore, this disclosure also provides an engineering vehicle, which includes a vehicle body, one or more wheel-side gearboxes according to some embodiments of this disclosure, and wheels disposed on the wheel-side gearboxes.

[0034] While numerous embodiments of this disclosure have been shown and described herein, it will be apparent to those skilled in the art that such embodiments are provided by way of example only. Many modifications, alterations, and alternatives will occur to those skilled in the art without departing from the spirit and intent of this disclosure. It should be understood that various alternatives to the embodiments of this disclosure described herein may be employed in the practice of this disclosure. The appended claims are intended to define the scope of this disclosure and therefore cover equivalents or alternatives within the scope of these claims.

Claims

1. A transmission device for a wheel, characterized in that, include: Shell (1); The hub (3) is rotatably connected to the housing (1), and a toothed ring (13) is fixedly provided inside the hub (3). The spindle assembly (7) includes a spindle (71) and a sun gear (72) fixedly connected to the spindle (71); The secondary shaft assembly (8) includes a secondary shaft (82) for fixed connection with a secondary gear (81) and a travel gear (83), the secondary gear (81) meshing with the sun gear (72) and the travel gear (83) meshing with the gear ring (13).

2. The transmission device according to claim 1, characterized in that, It also includes two support bearings (4), which are axially disposed on both sides of the gear ring (13).

3. The transmission device according to claim 2, characterized in that, It also includes a rotating bracket (5), which is fixedly connected to the housing (1) and defines a gear groove (140) for accommodating the gear ring (13) with the housing (1). Two support bearings (4) are fixedly disposed on the housing (1) and the rotating bracket (5) respectively.

4. The transmission device according to claim 1, characterized in that, An oil seal assembly is fitted on the main shaft (71), and the radial outer side of the oil seal assembly is sealed to the housing (1).

5. The transmission device according to claim 4, characterized in that, The oil seal assembly further includes an end cap (16) and an annular oil seal (17) that mates with the end cap (16). The end cap (16) includes a first ring (167) and a second ring (161) spaced apart along the axial direction. The annular oil seal (17) abuts against the radially inner side of the first ring (167).

6. The transmission device according to claim 5, characterized in that, The end cap (16) also includes an oil outlet (168) extending radially outward, and the housing (1) also has an oil passage (102) communicating with the oil outlet (168), and the oil passage (102) is connected to the sub-shaft assembly (8).

7. The transmission device according to claim 1, characterized in that, The main shaft assembly (7) with a sun gear (72) and the secondary shaft assembly (8) with a travel gear (83) are arranged axially away from each other.

8. The transmission device according to claim 1, characterized in that, The housing (1) is provided with a sealing shoulder (11) extending axially toward the hub (3) along the main shaft (71), and the hub (3) and the sealing shoulder (11) overlap radially.

9. A wheel-side gearbox, characterized in that, Includes a transmission device for a wheel according to any one of claims 1 to 8.

10. An engineering vehicle, characterized in that, Includes the wheel-side gearbox according to claim 9.

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