Swing bridge and engineering machinery

Abstract

The invention relates to the technical field of engineering machinery, and discloses a swing bridge and engineering machinery. The swing axle comprises an axle body, a hub speed reducing mechanism, a driving motor assembly and a swing mechanism. The two sets of hub speed reducing mechanisms are installed at the two axial ends of the axle body correspondingly. Each hub speed reducing mechanism comprises a hub speed reducer. The driving motor assembly is installed in the axle body, the driving motor assembly comprises two driving motors, the two driving motors are arranged close to the two axial ends of the axle body respectively, and driving shafts of the driving motors are in driving connection with the adjacent hub reducers; the swing mechanism is arranged on the axle body. On the basis of the prior art, a main speed reducer is omitted, the two driving motors are arranged at the two ends of the axle body respectively, meanwhile, in order to improve the rotating speed of the motors and reduce the weight and cost of the motors, the two hub speed reducing mechanisms are adopted, a larger speed reducing ratio and larger output torque are obtained, and the axle is suitable for low-speed, heavy-load, large-torque and other special occasions.

Description

Technical Field

[0001] The present application belongs to the technical field of engineering machinery, and specifically relates to a swing bridge and engineering machinery. Background Art

[0002] The traditional automobile drive axle is composed of a main reducer and a wheel-side reducer, with low transmission efficiency, high noise, and a relatively complex structure. The bridge housing is mostly a cast bridge housing, which is complicated to open the mold. When the geometric dimensions of the axle change, the mold needs to be opened again, resulting in a long development cycle, high development costs, and a large space occupied by the layout of parts. At present, the motor drive axle is driven by an electric motor, which improves the transmission efficiency compared to the transmission drive axle, but the motor drive axle usually uses a single-stage wheel-side reducer, which makes it impossible for the drive motor to obtain a larger reduction ratio and a larger output torque, and thus cannot meet some special occasions, such as: mining, heavy-duty transportation, etc. Summary of the invention

[0003] The purpose of the present application is to provide a swing bridge and engineering machinery, so that the swing bridge has a larger reduction ratio and output torque.

[0004] In order to achieve the above objectives, the present application provides a swing bridge, comprising:

[0005] Axle body;

[0006] Wheel-side reduction mechanisms, which are in two groups and are respectively installed at two axial ends of the axle body, and the wheel-side reduction mechanisms include wheel-side reducers;

[0007] A drive motor assembly is installed in the axle body, and the drive motor assembly includes two drive motors, which are respectively arranged near the axial ends of the axle body, and the drive shafts of the drive motors are drivingly connected to the adjacent wheel-side reducers;

[0008] The swing mechanism is arranged on the axle body.

[0009] In some embodiments, the wheel-end reducer includes a half shaft, and the half shaft is spline-connected to the driving shaft of the driving motor.

[0010] In some embodiments, the wheel-side reduction mechanism further includes:

[0011] A gear, coaxially drivingly connected with the half shaft;

[0012] A primary planetary gear assembly, comprising a primary planet carrier and a primary planetary gear disposed on the primary planet carrier, wherein the outer periphery of the primary planetary gear meshes with the outer periphery of the gear;

[0013] A sun gear drivingly connected to the primary planet carrier;

[0014] A secondary planetary gear assembly, comprising a secondary planetary carrier and a secondary planetary gear arranged on the outer periphery of the secondary planetary carrier, wherein the outer periphery of the secondary planetary gear is meshed with the outer periphery of the sun gear;

[0015] The hub is arranged on the outer periphery of the secondary planet carrier.

[0016] In some embodiments, a shaft tube is sleeved on the half shaft, and the wheel-side reduction mechanism also includes a ring gear arranged on the outer periphery of the first-stage planetary gear and a ring gear bracket for mounting the ring gear, and the ring gear bracket is detachably mounted on the outer periphery of the shaft tube.

[0017] In some embodiments, a seal is provided at the connection between the stop of the secondary planet carrier and the hub.

[0018] In some embodiments, the swing mechanism includes a swing frame support and a swing frame, a reinforcing rib is connected between the swing frame support and the outer shell of the axle body, the swing frame is installed at one end of the swing frame support away from the outer shell of the axle body, and a bushing with a lubrication oil channel is installed between the swing frame support and the swing frame.

[0019] In some embodiments, the drive motor assembly further includes a brake, and a brake disc of the brake is spline-connected to a drive shaft of the drive motor.

[0020] In some embodiments, the drive motor assembly further includes a brake caliper detachably provided on the drive motor, wherein the brake caliper is used to clamp a brake disc.

[0021] In some embodiments, the wheel-side reduction mechanism and the end of the axle body are detachably connected via a connecting sleeve.

[0022] A second aspect of the present application provides an engineering machine, which includes the swing bridge as described above.

[0023] Through the above technical scheme, two sets of wheel-side reduction mechanisms are installed at the axial ends of the axle body, and the wheel-side reduction mechanisms include wheel-side reducers; the drive motor assembly is installed in the axle body, and the drive motor assembly includes two drive motors, which are arranged close to the axial ends of the axle body respectively, and the drive shafts of the drive motors are connected to the adjacent wheel-side reducers; the swing mechanism is arranged on the axle body. On the basis of the prior art, the present invention eliminates the main reducer, and arranges a drive motor at both ends of the axle body respectively, which can increase the motor speed, reduce the weight and cost of the motor, and install a wheel-side reduction mechanism at both ends of the axle body respectively, and each wheel-side reduction mechanism is connected to the drive motor, so that the axle assembly obtains a larger reduction ratio and a larger output torque, which is suitable for special occasions such as low speed, heavy load, and large torque.

[0024] Other features and advantages of the embodiments of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings are used to provide a further understanding of the embodiments of the present application and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the embodiments of the present application, but do not constitute a limitation on the embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without creative work. In the drawings:

[0026] Figure 1 is a structural schematic diagram of a swing bridge according to the present application;

[0027] Figure 2 It is a cross-sectional schematic diagram of the wheel-side reduction mechanism in the swing bridge according to the present application;

[0028] Figure 3 is a cross-sectional schematic diagram of a drive motor assembly in a swing bridge according to the present application;

[0029] Figure 4 It is a schematic structural diagram of the axle body in the swing bridge according to the present application.

[0030] Description of Reference Numerals

[0031] 10 Axle body 292 Gear ring bracket

[0032] 20 Wheel side reduction mechanism 30 Drive motor assembly

[0033] 21 Half shaft 31 Drive motor

[0034] 22 Half shaft oil seal 32 Drive shaft

[0035] 23 First-stage planet carrier 40 Connecting sleeve

[0036] 24 First-stage planetary gear 50 Brake

[0037] 25 Secondary planet carrier 61 Swing frame support

[0038] 26 Secondary planetary gear 62 Swing frame

[0039] 27 Sun gear 63 reinforcement rib

[0040] 28 wheel hub 70 brake caliper

[0041] 29 shaft tube 80 flange

[0042] 291 Ring gear DETAILED DESCRIPTION

[0043] The specific implementation of the present application is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present application, and is not used to limit the present application.

[0044] The swing bridge and engineering machinery according to the present application will be described below with reference to the accompanying drawings.

[0045] In the prior art, the axle of the engineering machinery is connected to the vehicle body through a suspension, and wheels are installed at both ends of the axle. The function of the axle is to bear the load of the car and maintain the normal driving of the engineering machinery on the road. It also has a transmission system and a braking system for the wheel axle. The axle and the drive structure of the existing axle system are separated, and the drive mechanism is installed separately on the vehicle body. The connection between the drive mechanism and the axle occupies a large space in the vehicle body, and the entire suspension is heavy, so that the vehicle body and the axle need to meet higher strength requirements. In addition, in the current engineering machinery industry, a separate gearbox and axle reducer are usually used in conjunction with the drive motor, resulting in low transmission efficiency.

[0046] In view of this, if Figure 1 The structure diagram of the swing bridge is shown. The present application provides a swing bridge, which includes an axle body 10, a wheel-side reduction mechanism 20, a drive motor assembly 30 and a swing mechanism; the wheel-side reduction mechanism 20 is in two groups and is respectively installed at the axial ends of the axle body 10, and the wheel-side reduction mechanism 20 includes a wheel-side reducer; the drive motor assembly 30 is installed in the axle body 10, and the drive motor assembly 30 includes two drive motors 31, and the two drive motors 31 are respectively arranged near the axial ends of the axle body 10 and are symmetrically distributed, and the drive shaft 32 of the drive motor 31 is drive-connected to the adjacent wheel-side reducer, that is, each wheel-side reducer is respectively connected to the drive shaft 32 of a drive motor 31; the swing mechanism is arranged on the axle body 10 to realize the swing function of the swing bridge.

[0047] On the basis of the prior art, the present invention eliminates the main reducer and arranges a drive motor 31 at each end of the axle body 10, and realizes the rotation direction of the swing bridge tire by controlling the forward and reverse rotation of the drive motor 31; at the same time, in order to increase the rotation speed of the drive motor 31 and reduce the weight and cost of the drive motor 31, two wheel-side reduction mechanisms 20 are arranged at the axial ends of the axle body 10, and the two wheel-side reduction mechanisms 20 are respectively connected to the drive shafts 32 of the two drive motors 31, so that each wheel-side reduction mechanism 20 can control the output torque and reduction ratio of the corresponding drive motor 31, so that the axle assembly can obtain a larger reduction ratio and a larger output torque, which is suitable for special occasions such as low speed, heavy load, and large torque. At the same time, when braking energy recovery is performed, the involute gear can meet a larger back-up torque and improve the energy recovery efficiency.

[0048] Furthermore, the vehicle equipped with the swing bridge of the present application does not need to be equipped with an engine, a gearbox, a drive shaft, and the spiral bevel gears of a traditional axle, and has higher transmission efficiency, fewer transmission parts, lower noise, smoother transmission, lower energy consumption, and simpler maintenance.

[0049] In some embodiments, the wheel reducer includes a reducer body and a half shaft 21 inserted into the reducer body, and the half shaft 21 is spline-connected to the drive shaft 32 of the drive motor 31. When the drive shaft 32 of the drive motor 31 rotates, the half shaft 21 of the wheel reducer can be driven to rotate simultaneously.

[0050] like Figure 2 and Figure 3 As shown, in some embodiments, the wheel-side reduction mechanism 20 also includes a gear, a primary planetary gear assembly, a sun gear 27, a secondary planetary gear assembly and a hub 28; the gear is coaxially driven and connected to the half shaft 21; the primary planetary gear assembly includes a primary planetary carrier 23 and a primary planetary wheel 24 disposed on the primary planetary carrier 23, and the outer periphery of the primary planetary wheel 24 is meshed with the outer periphery of the gear; the sun gear 27 is drivingly connected to the primary planetary carrier 23; the secondary planetary gear assembly includes a secondary planetary carrier 25 and a secondary planetary wheel 26 disposed on the outer periphery of the secondary planetary carrier 25, and the outer periphery of the secondary planetary wheel 26 is meshed with the outer periphery of the sun gear 27; the hub 28 is disposed on the outer periphery of the secondary planetary carrier 25.

[0051] When the drive shaft 32 of the drive motor 31 drives the half shaft 21 to rotate, the half shaft 21 and the center of the gear are coaxially splined, so that the gear can be driven to rotate; and the outer peripheral gear teeth of the gear are meshed with the outer peripheral gear teeth of the primary planetary gear 24, so that the primary planetary gear 24 can be driven to rotate, and the primary planetary gear 24 and the primary planetary carrier 23 are detachably connected, so that the primary planetary carrier 23 can be driven to rotate with the primary planetary gear 24. In this embodiment, the wheel-side reduction mechanism 20 adopts a two-stage NGW planetary gear reduction structure, which has a larger reduction ratio, can increase the speed of the drive motor 31, reduce the weight of the drive motor 31, and reduce costs.

[0052] In some embodiments, a shaft tube 29 is sleeved on the half shaft 21, and the wheel-side reduction mechanism 20 further includes a ring gear 291 disposed on the outer periphery of the primary planetary gear 24 and a ring gear bracket 292 for mounting the ring gear 291, and the ring gear bracket 292 is splined to the shaft tube 29. The ring gear 291 and the ring gear bracket 292 are circumferentially connected to transmit torque with concentric inner and outer involute tooth profiles, and are axially fixed by a retaining spring, and the ring gear bracket 292 is fixed to the outer periphery of the shaft tube 29 by a locking nut. Under the fixation of the ring gear 291, the primary planetary gear 24 drives the primary planetary carrier 23 to rotate, and the primary planetary carrier 23 is rigidly connected to the sun gear 27 through bolts, thereby driving the sun gear 27 to rotate. Since the outer peripheral gear teeth of the sun gear 27 are meshed with the outer peripheral gear teeth of the secondary planetary gear 26, the secondary planetary gear 26 also drives the secondary planetary carrier 25 to rotate under the fixation of the ring gear 291, and the secondary planetary carrier 25 drives the wheel hub 28 to rotate through the bolt connection. In addition, a half-shaft oil seal 22 is provided between the shaft tube 29 and the half-shaft 21 to achieve a sealed fit between the shaft tube 29 and the half-shaft 21 to prevent leakage of gear oil in the wheel-side reduction mechanism.

[0053] In some embodiments, a seal is provided at the connection between the stopper of the secondary planet carrier 25 and the wheel hub 28. The seal may be a common rubber sealing component in the prior art, such as a sealing ring or an O-ring, to prevent oil leakage at the connection between the stopper of the secondary planet carrier 25 and the wheel hub 28.

[0054] In some embodiments, the swing mechanism includes a swing frame support 61 and a swing frame 62. A reinforcing rib 63 is connected between the swing frame support 61 and the outer shell of the axle body 10. The swing frame 62 is installed at one end of the swing frame support 61 away from the outer shell of the axle body 10. A bushing with a lubricating oil channel is also installed between the swing frame support 61 and the swing frame 62 to reduce friction resistance and improve wear resistance.

[0055] Preferably, if Figure 1As shown, the number of swing mechanisms of the present application is two groups, and the two groups of swing mechanisms have the same structural form and are symmetrically arranged on the front and rear sides of the outer shell of the axle body 10. For one group of swing mechanisms, a cover plate is installed at one end of the swing frame 62 facing the swing frame support 61. When the swing frame 62 and the swing frame support 61 are connected, the two are fixed by bolts, so as to achieve axial fixation of the swing frame 62 and the swing frame support 61. The end of the swing frame support 61 away from the swing frame 62 is welded to the outer shell of the axle body 10. Further, in order to improve the welding strength between the swing frame support 61 and the outer shell of the axle body 10, a plurality of reinforcing ribs 63 are also connected between the swing frame support 61 and the outer shell of the axle body 10. Among them, the outer peripheral wall of the swing frame support 61 is a cylindrical structure, and the number of reinforcing ribs 63 is multiple and evenly spaced and arranged on the outer peripheral wall of the swing frame support 61. In a preferred embodiment, the reinforcing ribs 63 are triangular plate structures, which reduce the weight of the components while ensuring the support strength. In addition, the swing frame 62 is installed at the end of the swing frame support 61 on the side away from the outer shell of the axle body 10 , and the two ends of the swing frame 62 are symmetrical about the central axis of the swing frame support 61 .

[0056] In some embodiments, the drive motor assembly 30 further includes a brake 50, and a brake disc of the brake 50 is spline-connected to the drive shaft 32 of the drive motor 31. The present application arranges the brake disc of the brake 50 on the drive shaft 32 of the drive motor 31, and brakes the drive shaft 32 of the drive motor 31 by the brake 50 to achieve vehicle braking, and can obtain greater braking force with smaller specifications through the torque-increasing effect of the wheel-side reducer, reduce the cylinder diameter and volume of the brake 50, and reduce costs and weight.

[0057] like Figure 3 As shown, in some embodiments, the drive motor assembly 30 further includes a brake caliper 70 detachably disposed on the drive motor 31, and the brake caliper 70 is used to clamp the brake disc to assist the brake disc in braking the drive motor 31. The brake caliper 70 and the drive motor 31 are bolted together, and the piston in the brake caliper 70 clamps the brake disc of the brake 50 under the action of hydraulic oil, thereby braking the drive shaft 32 of the drive motor 31 to rotate, so as to achieve vehicle braking.

[0058] In some embodiments, the wheel-side reduction mechanism 20 and the ends of the axle body 10 are detachably connected via a connecting sleeve 40. Flanges 80 are provided at both axial ends of the connecting sleeve 40. Preferably, the connecting sleeve 40 and the axle body 10 are connected by fasteners (such as bolt assemblies, etc.), the outer diameter of the connecting sleeve is smaller than the outer diameter of the axle body 10, and the outer peripheral wall of the connecting sleeve 40 adopts an arc-shaped transition structure to improve its assembly processability.

[0059] It should be noted that the axes of the wheel-side reduction mechanism 20, the axle body 10 and the flange 80 of the present application coincide with each other, and the drive shaft 32 of the drive motor 31 also coincides with the central axis of the wheel-side reduction mechanism 20, so that the axle assembly obtains the maximum reduction ratio and the maximum output torque.

[0060] The second aspect of the present application provides an engineering machine, such as a wheel loader, which includes the swing bridge described above. Since the wheel loader adopts all the embodiments of the swing bridge described above, it has all the beneficial effects brought by the swing bridge described above. In the wheel loader, if Figure 4 As shown, the outer shell of the axle body 10 of the swing bridge of the present application eliminates the cast bridge shell of the prior art and adopts a segmented bridge shell. The middle section of the shell is made of sheet metal and then welded, which is convenient for adjusting the wheelbase length, reducing mold investment, reducing manufacturing costs, and shortening the manufacturing cycle.

[0061] In addition, the engineering machinery also includes a controller connected to each drive motor 31. The swing axle is the rear axle. The difference between the front axle and the rear axle is that only the swing frame is cancelled, and the rest of the structure is the same as the rear axle. Both ends of the front axle and the rear axle are provided with tires for walking. The controller controls the speed and rotation direction of the four drive motors 31 respectively to realize the rotation direction of the wheels, thereby realizing the forward and backward movement of the vehicle. At the same time, compared with traditional axles, the turning radius of the vehicle can be reduced and the working efficiency can be improved; and, through the separate braking of the four drive motors 31 on the front and rear axles, the torque of each wheel can be controlled individually to maximize the use of ground adhesion, avoid slipping and improve the vehicle's ability to escape from difficulties.

[0062] In the description of the present application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present application, "plurality" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0063] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0064] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0065] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A swing bridge, characterized in that: include: Axle body (10); Wheel-side reduction mechanisms (20), which are in two groups and are respectively installed at two axial ends of the axle body (10), and the wheel-side reduction mechanisms (20) include wheel-side reducers; A drive motor assembly (30) is installed in the axle body (10), and the drive motor assembly (30) includes two drive motors (31). The two drive motors (31) are respectively arranged near the axial ends of the axle body (10), and the drive shafts (32) of the drive motors (31) are drivingly connected to the adjacent wheel-side reducers; The swing mechanism is arranged on the axle body (10).

2. The swing bridge according to claim 1, characterized in that: The wheel-side reducer comprises a half shaft (21), and the half shaft (21) and the driving shaft (32) of the driving motor (31) are spline-connected.

3. The swing bridge according to claim 2, characterized in that: The wheel-side speed reduction mechanism (20) further comprises: A gear, coaxially drivingly connected to the half shaft (21); A primary planetary gear assembly comprises a primary planet carrier (23) and a primary planetary gear (24) arranged on the primary planet carrier (23), wherein the outer periphery of the primary planetary gear (24) meshes with the outer periphery of the gear; A sun gear (27) drivingly connected to the primary planet carrier (23); A secondary planetary gear assembly comprises a secondary planetary carrier (25) and a secondary planetary gear (26) arranged on the outer periphery of the secondary planetary carrier (25), wherein the outer periphery of the secondary planetary gear (26) is meshed with the outer periphery of the sun gear (27); The wheel hub (28) is arranged on the outer periphery of the secondary planet carrier (25).

4. The swing bridge according to claim 3, characterized in that: A shaft tube (29) is sleeved on the half shaft (21), and the wheel-side reduction mechanism (20) also includes a ring gear (291) arranged on the outer periphery of the first-stage planetary gear (24) and a ring gear bracket (292) for mounting the ring gear (291), and the ring gear bracket (292) is detachably mounted on the outer periphery of the shaft tube (29).

5. The swing bridge according to claim 3, characterized in that: A sealing member is provided at the connection between the stopper of the secondary planet carrier (25) and the wheel hub (28).

6. The swing bridge according to any one of claims 1 to 5, characterized in that: The swing mechanism comprises a swing frame support (61) and a swing frame (62), a reinforcing rib (63) is connected between the swing frame support (61) and the outer shell of the axle body (10), the swing frame (62) is installed at one end of the swing frame support (61) away from the outer shell of the axle body (10), and a bushing with a lubricating oil channel is installed between the swing frame support (61) and the swing frame (62).

7. The swing bridge according to any one of claims 1 to 5, characterized in that: The drive motor assembly (30) further comprises a brake (50), wherein a brake disc of the brake (50) is spline-connected to a drive shaft (32) of the drive motor (31).

8. The swing bridge according to any one of claims 1 to 5, characterized in that: The drive motor assembly (30) further comprises a brake caliper (70) detachably arranged on the drive motor (31), wherein the brake caliper (70) is used to clamp a brake disc.

9. The swing bridge according to any one of claims 1 to 5, characterized in that: The wheel-side speed reduction mechanism (20) and the end of the axle body (10) are detachably connected via a connecting sleeve (40).

10. An engineering machine, characterized in that: The construction machine comprises a swing bridge according to any one of claims 1 to 9.

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