Power supply vehicle rear axle structure and power supply vehicle chassis

Abstract

The utility model provides a kind of power car rear axle structure, including axle spindle, brake, brake drum, wheel hub bearing unit and tire;The tire is fixedly connected with brake drum;The brake is fixedly connected with main axle spindle;The wheel hub bearing unit is connected with the axle spindle of installing brake, and fastening is completed by bearing fastening anti-loosening anti-disengagement component;The whole after tire and brake drum are connected is fixedly connected with wheel hub bearing unit, after installation, the brake drum is embedded in brake, and there is certain gap.The rear axle structure proposed in the utility model not only improves the stability, safety of the brake of power car, but also improves the convenience of maintenance of front and rear axle of power car.

Description

Technical Field

[0001] This utility model relates to the field of civil aviation power supply vehicles, and in particular to a rear axle structure and chassis of a power supply vehicle. Background Technology

[0002] Mobile civil aviation power supply vehicles (hereinafter referred to as "power supply vehicles") are power supply devices used at airports to supply power to aircraft. The power supply vehicle itself does not have autonomous driving power and needs to be towed by an external tractor. Figure 1 As shown, the rear axle 1 of the power supply vehicle bears most of the vehicle's weight. A tow bar 3 is installed on the front axle 2 of the power supply vehicle, and braking is achieved through this tow bar. When the tow bar is locked perpendicular to the ground, the parking brake is triggered; when the tow bar detaches from the towing vehicle, the service brake is triggered.

[0003] Currently, the front and rear axle technical solutions for electric vehicles on the market generally use a pair of open tapered roller bearing assemblies for tire rotation. Whether for service braking or parking braking, the front axle tires are engaged (engaging the tire tread, with the tread rubbing against the brake pads to reduce speed). The main problems with this type of solution are as follows.

[0004] On the one hand, the current mobile civil aviation power supply vehicles mainly use small (diameter less than 450mm) engineering tires. The rear axle tire bearings bear a large load and generate intense heat, requiring periodic maintenance and repairs to prevent tire detachment due to bearing failure (a problem unacceptable in the civil aviation industry). Maintenance and repairs mainly include bearing cleaning and replacement, adding lubricating grease, and replacing seals. Since the power supply vehicles are primarily used in airport aprons and hangars, conducting maintenance and repairs is extremely inconvenient.

[0005] On the other hand, the current braking scheme mainly relies on front axle tire clamping, which has three obvious drawbacks: First, it causes greater damage to the tire tread, shortening the life of the front axle tires; second, the increased wear on the tire tread reduces the braking capacity after the tires are clamped; and third, since the rear axle bears the main weight of the power vehicle, using front axle tire clamping braking in an emergency can easily cause the rear axle to fishtail and slip, which is a safety hazard for the operation of the power vehicle. Utility Model Content

[0006] This application provides a rear axle structure and chassis for a power supply vehicle to solve the problems in the background art.

[0007] Other features and advantages of this application will become apparent from the following detailed description, or may be learned in part from practice of this application.

[0008] According to a first aspect of the embodiments of this application, a rear axle structure for a power vehicle is provided, including an axle main shaft, a brake, a brake drum, a wheel hub bearing unit, and a tire; the tire is fixedly connected to the brake drum; the brake is fixedly connected to the main shaft of the axle; the wheel hub bearing unit is connected to the axle main shaft on which the brake is installed, and is fastened by a bearing fastening anti-loosening and anti-detachment component; the entire assembly after the tire and brake drum are connected is fixedly connected to the wheel hub bearing unit, and after installation, the brake drum is embedded in the brake with a certain gap.

[0009] In one embodiment of this application, the brake drum is provided with a plurality of tire fastening screws; after the tire is connected to the brake drum by the plurality of tire fastening screws, it is locked by a plurality of locking nuts.

[0010] In one embodiment of this application, the brake drum is connected to the wheel hub bearing unit via tire brake drum fastening screws.

[0011] In one embodiment of this application, the bearing fastening anti-loosening and anti-disengagement assembly includes a bearing outer ring anti-disengagement baffle and an anti-loosening standard component. After the wheel hub bearing unit is connected to the axle main shaft, the bearing outer ring anti-loosening baffle and the anti-loosening standard component are installed in sequence to complete the fastening of the wheel hub bearing unit to the axle main shaft.

[0012] In one embodiment of this application, the anti-loosening standard component includes a double-stacked wedge washer, a slotted anti-loosening nut, and a cotter pin, which are sequentially installed on one side of the bearing outer ring anti-loosening baffle.

[0013] In one embodiment of this application, the brake is fixedly connected to a nut pre-installed on the axle spindle by screws.

[0014] In one embodiment of this application, a bearing dust cover is also included. The bearing dust cover is installed on the outside of the tire. When the tire is fixedly connected to the brake drum, the connection is completed by the brake drum fastening screws and the tire working together with the tire fastening screws on the brake drum.

[0015] In one embodiment of this application, the brake drum is an integrally formed variable diameter brake drum, including a large diameter end and a small diameter end; a tire fastening screw is pressed onto the small diameter end face, and the small diameter end face passes through the brake drum fastening screw and mates with the threaded hole of the wheel hub bearing unit; the large diameter inner circle is sleeved on the outer circle shoe of the brake to achieve friction braking.

[0016] In one embodiment of this application, the hub bearing unit is a maintenance-free hub bearing unit.

[0017] According to a second aspect of the embodiments of this application, a power vehicle chassis is provided, including a chassis structure, a front axle structure, and the rear axle structure described in the first aspect; the front axle structure includes an axle main shaft and tires mounted on the axle main shaft; the front axle structure and the rear axle structure are respectively mounted on the front and rear sides of the chassis structure; the power vehicle chassis is braked via the rear axle structure.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows: (1) By placing the braking structure of the power supply vehicle on the heavy-duty rear axle, the problem of tail-swing during emergency braking was solved, the front axle tires were protected, and the overall vehicle braking stability was improved.

[0019] (2) By adjusting the diameter of the brake drum, a flexible matching of a large-size brake drum on a small-diameter engineering tire can be achieved; the variable diameter structure of the brake drum amplifies the braking torque and improves the braking capacity.

[0020] (3) By applying the maintenance-free wheel hub bearing unit solution, the inconvenience of tire bearing inspection and maintenance at the airport has been solved, and the convenience of assembly and the economy of power vehicle operation have also been improved.

[0021] (4) The bearing anti-loosening and anti-detachment combined structure design, through the innovative application of anti-loosening standard parts, and the design of bearing outer ring anti-detachment baffle, solves the problem of tire falling off and being lost at the airport after the bearing rolling element is damaged in special scenarios, which greatly improves the safety of the whole vehicle operation. Attached Figure Description

[0022] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0023] Figure 1 This is a schematic diagram of the existing power supply vehicle structure.

[0024] Figure 2 This is a schematic diagram of the rear axle structure of the power supply vehicle according to an embodiment of this application.

[0025] Figure 3 This is a schematic diagram of the bearing fastening and anti-loosening component in the rear axle structure of the power vehicle according to an embodiment of this application.

[0026] Reference numerals: 1-Rear axle, 2-Front axle, 3-Traction rod, 4-Locking nut, 5-Bearing dust cover, 6-Tire, 7-Brake drum fastening screw, 8-Tire fastening screw, 9-Brake drum, 10-Bearing fastening anti-loosening and anti-detachment assembly, 11-Wheel hub bearing unit, 12-Brake, 13-Axle main shaft, 10.1-Cotter pin, 10.2-Slotted anti-loosening nut, 10.3-Double-stacked wedge washer, 10.4-Bearing outer ring anti-detachment baffle. Detailed Implementation

[0027] The embodiments of this application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar modules or modules having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. Rather, the embodiments of this application include all variations, modifications, and equivalents falling within the spirit and scope of the appended claims.

[0028] To address the shortcomings of the prior art, this application proposes a rear axle structure for a power supply vehicle. It innovatively designs a variable-diameter brake drum and a bearing anti-loosening and anti-detachment combination structure, integrating an independent maintenance-free bearing and a drum brake. This transfers the braking method from the front axle to the rear axle, protecting the front axle tires while improving the stability and safety of the power supply vehicle's braking, and also enhancing the convenience of maintenance and repair of the front and rear axles.

[0029] For details, please refer to Figure 2 The rear axle structure of the power vehicle includes an axle main shaft 13, a brake 12, a brake drum 9, a wheel hub bearing unit 11, and tires 6. The two tires 6 are respectively installed on both sides of the axle main shaft 13, and the installation method is the same. This embodiment only describes the installation method of one side of the tire 6; the other side is installed in a mirror image.

[0030] Specifically, tire 6 is fixedly connected to brake drum 9; brake 12 is fixedly connected to main axle shaft; at the same time, wheel hub bearing unit 11 is connected to axle shaft 13 on which brake 12 is installed, and is fastened by bearing fastening anti-loosening and anti-detachment component 10; then, the whole assembly after tire 6 and brake drum 9 are connected is fixedly connected to wheel hub bearing unit 11. After installation, brake drum 9 is embedded in brake 12, and there is a certain gap between the two to meet braking requirements.

[0031] Please continue to refer to this. Figure 2 The brake drum 9 is equipped with multiple tire fastening screws 8. During installation, the multiple tire fastening screws 8 pass through the web hole of the tire 6 and are then locked by multiple locking nuts 4.

[0032] In one embodiment, to prevent a large amount of dust from entering the wheel hub bearing unit 11 during driving, a bearing dust cover 5 is also provided on the outer side of the tire 6 web. When the tire 6 is fixedly connected to the brake drum 9, multiple tire fastening screws 8 pass through the holes in the tire 6 web and then through the bearing dust cover 5, and then the fixed connection is completed by the brake drum fastening screws 7 and the tire fastening screws 8 on the brake drum 9.

[0033] Please continue to refer to this. Figure 2 The brake drum 9 is connected to the wheel hub bearing unit 11 via the brake drum fastening screw 7 of the tire 6. The brake 12 is fixedly connected to the nut pre-installed on the axle main shaft 13 by screws.

[0034] In one embodiment, the wheel hub bearing unit 11 is implemented using a maintenance-free wheel hub bearing unit 11. Replacing the open bearing with the maintenance-free wheel hub bearing unit 11 facilitates installation, facilitates replacement, reduces maintenance frequency, saves operating costs, and improves the economic efficiency of equipment operation. This effectively solves the inconvenience of tire bearing inspection and maintenance at airports, while also improving assembly convenience and the economic efficiency of power vehicle operation.

[0035] In one embodiment, the brake drum 9 is implemented as a variable-diameter brake drum 9. By adjusting the diameter of the brake drum 9, a flexible match can be achieved between a large-size brake drum 9 and a small-diameter engineering tire. The variable-diameter structure of the brake drum 9 amplifies the braking torque and improves the braking capacity. This variable-diameter brake drum is a one-piece molded structure, divided into a large-diameter end and a small-diameter end. The tire fastening screw 8, which mates with the locking nut 4, is pressed onto the small-diameter end face. At the same time, the small-diameter end face passes through the brake drum fastening screw 7 and mates with the threaded hole of the wheel hub bearing unit 11. The large-diameter inner circle is fitted onto the outer circle shoe of the brake 12 to achieve friction braking.

[0036] Please refer to Figure 2 , 3 In this embodiment, the bearing fastening anti-loosening and anti-detachment assembly 10 includes a bearing outer ring anti-detachment baffle 10.4 and an anti-loosening standard component. After the wheel hub bearing unit 11 is connected to the axle main shaft 13, the bearing outer ring anti-loosening baffle 10.4 and the anti-loosening standard component are installed in sequence to complete the fastening of the wheel hub bearing unit 11 and the axle main shaft 13.

[0037] Furthermore, the anti-loosening standard component includes a double-stacked wedge washer 10.3, a slotted anti-loosening nut 10.2, and a cotter pin 10.1, which are sequentially installed on one side of the bearing outer ring anti-loosening baffle 10.4. During installation, the bearing outer ring anti-loosening baffle 10.4, the double-stacked wedge washer 10.3, the slotted anti-loosening nut 10.2, and the cotter pin 10.1 are sequentially installed on the outside of the wheel hub bearing unit 11, solving the problem of tire 6 falling off and being lost at the airport after the bearing rolling elements are damaged in special scenarios, and greatly improving the safety of the entire vehicle operation.

[0038] The rear axle structure of the power supply vehicle proposed in this embodiment can be installed in a decentralized manner during the manufacturing and assembly process. Furthermore, this embodiment provides a specific assembly process.

[0039] (1) Brake 12 assembly. Install the brake 12 on the axle spindle 13 and connect it with the pre-reserved nut on the axle spindle 13 using screws to complete the assembly of the brake 12 and the axle spindle 13.

[0040] (2) Assembly of the maintenance-free wheel hub bearing unit 11. The wheel hub bearing unit 11 is fitted onto the mounting shaft of the axle main shaft 13 and secured using the bearing fastening anti-loosening and anti-disengagement assembly 10, such as... Figure 3 As shown, the bearing outer ring anti-loosening baffle 10.4, double-stacked wedge washer 10.3, slotted anti-loosening nut 10.2 and cotter pin 10.1 are assembled in the following order.

[0041] (3) Brake drum 9 assembly. Press multiple tire fastening screws 8 onto the brake drum 9, and then use brake drum fastening screws 7 to connect the brake drum 9 with the wheel hub bearing unit 11. At the same time, adjust the gap between the brake shoes of the brake 12 and the brake drum 9 to complete the installation of the brake drum 9; (4) Tire 6 assembly. Pass the tire 6 and bearing dust cover 5 through the tire fastening screw 8, that is, the tire 6 is in contact with the end face of the brake drum 9, and the dust cover is in contact with the web of the tire 6. Then use the lock nut 4 and the tire fastening screw 8 to complete the thread fastening, and the tire 6 assembly is completed.

[0042] Furthermore, this embodiment also provides a method for implementing a power vehicle chassis, which mainly includes a chassis structure, a front axle structure, and the aforementioned rear axle structure; the front axle structure includes an axle main shaft and tires mounted on the axle main shaft; the front axle structure and the rear axle structure are respectively mounted on the front and rear sides of the chassis structure; the power vehicle chassis is braked through the rear axle structure.

[0043] The power vehicle chassis layout proposed in this embodiment places the braking structure of the power vehicle on the heavy-duty rear axle, which solves the problem of fishtailing during emergency braking, protects the front axle tires, and improves the overall vehicle braking stability.

[0044] Example 1 This embodiment proposes a rear axle structure for a power vehicle, including an axle main shaft, a brake, a brake drum, a wheel hub bearing unit, and a tire; the tire is fixedly connected to the brake drum; the brake is fixedly connected to the main axle main shaft; the wheel hub bearing unit is connected to the axle main shaft on which the brake is installed, and is fastened by a bearing fastening anti-loosening and anti-detachment component; the entire assembly after the tire and brake drum are connected is fixedly connected to the wheel hub bearing unit, and after installation, the brake drum is embedded in the brake with a certain gap.

[0045] Example 2 Based on Example 1, in this example, the brake drum is provided with multiple tire fastening screws; after the tire is connected to the brake drum through the multiple tire fastening screws, it is locked by multiple locking nuts.

[0046] Example 3 Based on Example 1, in this example the brake drum is connected to the wheel hub bearing unit via tire brake drum fastening screws.

[0047] Example 4 Based on Example 1, the bearing fastening and anti-loosening component in this example includes an outer ring anti-loosening baffle and an anti-loosening standard component. After the wheel hub bearing unit is connected to the axle main shaft, the outer ring anti-loosening baffle and the anti-loosening standard component are installed in sequence to complete the fastening of the wheel hub bearing unit to the axle main shaft.

[0048] Example 5 Based on Example 4, the anti-loosening standard components in this example include a double-stacked wedge washer, a slotted anti-loosening nut, and a cotter pin, which are installed sequentially on one side of the bearing outer ring anti-loosening baffle.

[0049] Example 6 Based on Example 1, the brake described in this example is fixedly connected to the nut pre-installed on the axle main shaft by screws.

[0050] Example 7 Based on Embodiment 1, this embodiment also includes a bearing dust cover. The bearing dust cover is installed on the outside of the tire. When the tire is fixedly connected to the brake drum, the connection is completed by the brake drum fastening screws and the tire together with the tire fastening screws on the brake drum.

[0051] Example 8 Based on Example 1, the brake drum in this example is an integrally formed variable diameter brake drum, including a large diameter end and a small diameter end; the small diameter end face is press-fitted with a tire fastening screw, and the small diameter end face passes through the brake drum fastening screw and mates with the threaded hole of the wheel hub bearing unit; the large diameter inner circle is sleeved on the outer circle shoe of the brake to achieve friction braking.

[0052] Example 9 Based on Example 1, in this example, the hub bearing unit is a maintenance-free hub bearing unit.

[0053] Example 10 Based on Embodiments 1 to 9, this embodiment provides a power vehicle chassis, including a chassis structure, a front axle structure, and a rear axle structure as described in the previous embodiments; the front axle structure includes an axle main shaft and tires mounted on the axle main shaft; the front axle structure and the rear axle structure are respectively mounted on the front and rear sides of the chassis structure; the power vehicle chassis is braked through the rear axle structure.

[0054] The present invention can be well implemented through Examples 1 to 10.

[0055] It should be noted that, in the description of the embodiments of this utility model, unless otherwise explicitly specified and limited, the terms "set" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. The accompanying drawings in the embodiments are used to clearly and completely describe the technical solutions in the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0056] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A rear axle structure for a power supply vehicle, characterized in that, The system includes an axle main shaft, a brake, a brake drum, a wheel hub bearing unit, and a tire. The tire is fixedly connected to the brake drum. The brake is fixedly connected to the main axle main shaft. The wheel hub bearing unit is connected to the axle main shaft on which the brake is installed, and is secured by a bearing fastening and anti-loosening component. The entire assembly after the tire and brake drum are connected is fixedly connected to the wheel hub bearing unit. After installation, the brake drum is embedded in the brake with a certain gap.

2. The power vehicle rear axle structure according to claim 1, characterized in that, The brake drum is provided with multiple tire fastening screws; after the tire is connected to the brake drum through the multiple tire fastening screws, it is locked by multiple locking nuts.

3. The power vehicle rear axle structure according to claim 1, characterized in that, The brake drum is connected to the wheel hub bearing unit via tire brake drum fastening screws.

4. The power vehicle rear axle structure according to claim 1, characterized in that, The bearing fastening and anti-loosening assembly includes an outer ring anti-loosening baffle and an anti-loosening standard component. After the wheel hub bearing unit is connected to the axle main shaft, the outer ring anti-loosening baffle and the anti-loosening standard component are installed in sequence to complete the fastening of the wheel hub bearing unit to the axle main shaft.

5. The power vehicle rear axle structure according to claim 4, characterized in that, The anti-loosening standard components include a double-stacked wedge washer, a slotted anti-loosening nut, and a cotter pin, which are installed sequentially on one side of the anti-loosening baffle of the bearing outer ring.

6. The power vehicle rear axle structure according to claim 1, characterized in that, The brake is fixedly connected to the nut pre-installed on the axle main shaft by screws.

7. The power vehicle rear axle structure according to claim 1, characterized in that, It also includes a bearing dust cover, which is installed on the outside of the tire. When the tire is fixedly connected to the brake drum, the connection is completed by the brake drum fastening screws and the tire working together with the tire fastening screws on the brake drum.

8. The power vehicle rear axle structure according to claim 1, characterized in that, The brake drum is an integrally formed variable diameter brake drum, including a large diameter end and a small diameter end; the small diameter end face is press-fitted with a tire fastening screw, and at the same time, the small diameter end face passes through the brake drum fastening screw and mates with the threaded hole of the wheel hub bearing unit; the large diameter inner circle is sleeved on the outer circle shoe of the brake to achieve friction braking.

9. The power vehicle rear axle structure according to claim 1, characterized in that, The hub bearing unit is a maintenance-free hub bearing unit.

10. A power supply vehicle chassis, characterized in that, It includes a chassis structure, a front axle structure, and a rear axle structure as described in any one of claims 1 to 9; the front axle structure includes an axle spindle and tires mounted on the axle spindle; the front axle structure and the rear axle structure are respectively mounted on the front and rear sides of the chassis structure; the power vehicle chassis is braked via the rear axle structure.

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