An electric bulldozer

Abstract

The utility model relates to engineering machinery technical field provides an electric bulldozer, including mainframe, power system and electrical system assembly, and power system and electrical system assembly electric connection, power system includes first battery assembly, second battery assembly, the mainframe front end extends to the installation first battery assembly, the middle part subsides to install second battery assembly, and the rear end extends to form the support to bear electrical system assembly, design power system by first battery assembly, second battery assembly are formed, and first battery assembly, second battery assembly are distributed in the installation mainframe front end, middle part, make full use of the whole car space arrangement big electric quantity battery, improve the utilization efficiency of the whole car space, effectively improve the whole car endurance, balance the gravity distribution of whole car simultaneously, strengthen the stability and safety of equipment driving and operation time, set up electrical system assembly in mainframe rear end, then can effectively reduce the maintenance difficulty.

Description

Technical Field

[0001] This utility model relates to the field of engineering machinery technology, and in particular to an electric bulldozer. Background Technology

[0002] Driven by both environmental pressures and the need for low operating costs, high-efficiency, energy-saving, and environmentally friendly electric bulldozers have become a trend in the bulldozer industry. However, bulldozers are tracked vehicles used for traction, resulting in high power consumption. Long range and large battery capacity have become bottlenecks restricting the electrification of bulldozers.

[0003] There are two main types of existing bulldozers:

[0004] The first category consists of pure electric bulldozers, such as the second-generation electric bulldozer disclosed in application number CN202330060914.7, whose power battery capacity is approximately 350kWh, resulting in a short operating range. Subsequent improved models, such as the third-generation electric bulldozer disclosed in application number CN202330531055.5, while increasing the power battery to 453kWh and extending the range to some extent, still have limited effectiveness. Furthermore, because the core electrical components of these bulldozers, such as the pump motor assembly, multi-function controller, and motor controller, are typically concentrated at the bottom of the cab, the compact layout results in extremely limited maintenance space, making component disassembly and troubleshooting very inconvenient, leading to poor maintainability and impacting equipment maintenance efficiency and operating costs.

[0005] The second category is hybrid bulldozers, such as the Chinese patent application CN201210140128.9, "A Hybrid Drive Device and Bulldozer for Bulldozers," which discloses a hybrid bulldozer including an engine, generator, current control module, and electric motor. It boasts advantages such as smooth and reliable transmission, low noise, and low fuel consumption. However, because it still retains an engine, exhaust pollution remains severe, and dual electric motors are costly and hinder equipment miniaturization. Utility Model Content

[0006] This utility model provides an electric bulldozer that solves the technical problems of poor overall vehicle range and high maintenance difficulty of existing bulldozers.

[0007] To solve the above technical problems, this utility model provides an electric bulldozer, including a main frame, a power system and an electrical system assembly, wherein the power system and the electrical system assembly are electrically connected;

[0008] The power system includes a first battery assembly and a second battery assembly;

[0009] The front end of the main frame extends forward to install the first battery assembly, the middle part sinks down to install the second battery assembly, and the rear end extends backward to form a bracket to support the electrical system assembly.

[0010] This basic design consists of a power system composed of a first battery assembly and a second battery assembly. The first and second battery assemblies are distributed and installed at the front and middle of the main frame, making full use of the vehicle space to arrange large-capacity batteries, improving the utilization efficiency of the vehicle space, effectively increasing the vehicle's range, and balancing the vehicle's center of gravity distribution to enhance the stability and safety of the equipment during driving and operation. By placing the electrical system assembly at the rear of the main frame, the difficulty of maintenance can be effectively reduced.

[0011] In a further embodiment, the first battery assembly includes at least one set of first battery packs and at least one set of battery mounting brackets: the battery mounting brackets have mounting cavities, the first battery packs are horizontally mounted in the mounting cavities of the battery mounting brackets, their terminals point to the side, and are electrically connected to the electrical system assembly via wiring; at least one set of the battery mounting brackets are arranged horizontally in multiple layers at the front end of the main frame.

[0012] In a further embodiment, the first battery packs are connected in series in pairs; an MSD physical switch is provided at the terminal of the first battery pack, and the first battery pack is electrically connected to another set of first battery packs through the MSD physical switch.

[0013] This solution uses a battery mounting bracket to stack the first battery pack, effectively improving the vehicle's space utilization efficiency and the battery pack's installation stability. The first battery pack is installed horizontally in the mounting cavity of the battery mounting bracket, thereby electrically connecting to another first battery pack via the MSD physical switch. The horizontal arrangement facilitates wiring and MSD insertion / removal, improving the convenience of battery pack maintenance.

[0014] In a further embodiment, the second battery assembly includes at least one set of transverse battery packs and at least one set of longitudinal battery packs. The longitudinal battery packs are radially mounted on the main frame, with their terminals pointing to the rear / front end, and are electrically connected to the transverse battery packs or electrical system assembly via wiring. The transverse battery packs are transversely mounted on the main frame and positioned on top of the longitudinal battery packs, with their terminals pointing to the side, and are electrically connected to the longitudinal battery packs / electrical system assembly via wiring.

[0015] In a further embodiment, the horizontal battery pack and the vertical battery pack are connected in series, and an MSD physical switch is provided at the wiring terminals of the horizontal battery pack and the vertical battery pack. The horizontal battery pack / vertical battery pack is electrically connected to another set of the vertical battery pack / horizontal battery pack through the MSD physical switch.

[0016] This design simultaneously installs at least one set of horizontal battery packs and at least one set of vertical battery packs in the middle of the limited mainframe, further utilizing the limited space to install more batteries and thus improve the driving range. Specifically, setting the bottom as a radially mounted vertical battery pack provides clearance for hydraulic lines and cables. The horizontal battery pack is set above the vertical battery pack to maximize space utilization, and the series connection between the vertical and horizontal battery packs is achieved through the MSD physical switch, which facilitates the insertion and removal of the MSD and reduces maintenance difficulty.

[0017] In a further embodiment, the electrical system assembly includes a battery high-voltage box, a pump motor controller, a pump motor assembly, a travel motor, and a multi-function controller. The battery high-voltage box is electrically connected to the multi-function controller and the power system. The multi-function controller is electrically connected to the pump motor controller and the travel motor. The pump motor controller is electrically connected to the pump motor assembly.

[0018] In a further embodiment, the system also includes two sets of walking tracks and drive wheels. The drive wheels are mounted on the main frame, with their inner sides rotatably connected to the walking motor and their outer sides rotatably connected to the walking tracks.

[0019] This scheme sets up two walking tracks on the left and right sides, each driven by one or more independent walking motors. Through direct motor drive, efficient and precise drive control is achieved, which is also beneficial for the implementation of regenerative braking.

[0020] In a further embodiment, the system also includes a driver's cab, wherein an upwardly extending support frame is provided in the middle of the main frame to support the driver's cab;

[0021] The pump motor assembly is installed in the middle of the rear end of the cab, and the pump motor controller and the battery high-voltage box are stacked on top of it in sequence.

[0022] In a further embodiment, the electrical system assembly further includes a water-cooled unit electrically connected to the all-in-one controller, wherein the water-cooled unit and the all-in-one controller are arranged vertically and positioned on the left rear end of the cab.

[0023] In a further embodiment, a hydraulic oil tank and an oil pump are also included, the hydraulic oil tank being installed on the right rear end of the cab, and the oil pump being electrically connected to the pump motor assembly.

[0024] This solution stacks high-voltage components such as the battery high-voltage box, pump motor controller, pump motor assembly, travel motor, multi-function controller, and water-cooled unit at the rear of the cab, optimizing the overall vehicle layout, improving accessibility, and effectively enhancing the convenience of vehicle maintenance. Attached Figure Description

[0025] Figure 1 This is a side view (perspective view) of an electric bulldozer provided in an embodiment of this utility model.

[0026] Figure 2 This is provided by the embodiment of the present utility model. Figure 1 Medium-depth view;

[0027] Figure 3 This is provided by the embodiment of the present utility model. Figure 1 Schematic diagram of the middle section;

[0028] Figure 4 This is provided by the embodiment of the present utility model. Figure 1 Middle section structural diagram;

[0029] Figure 5 This is provided by the embodiment of the present utility model. Figure 2 Enlarged view of the middle section structure;

[0030] Figure 6 This is a circuit connection diagram of the battery pack in the power system provided in this embodiment of the utility model;

[0031] Figure 7 This is provided by the embodiment of the present utility model. Figure 1 Mid-range power control framework diagram.

[0032] The components include: main frame 1, support frame a and support frame b; power system 2, electrical system assembly 3; running track 4, drive wheel 5, cab 6, hydraulic oil tank 7, vehicle shell 8;

[0033] First battery assembly 21, first battery pack 211, battery mounting bracket 212; second battery assembly 22, horizontal battery pack 221, vertical battery pack 222;

[0034] 31. Battery high voltage box, 32. Pump motor controller, 33. Pump motor assembly, 34. Walking motor, 35. All-in-one controller, 36. Water-cooled unit. Detailed Implementation

[0035] The embodiments of this utility model are described in detail below with reference to the accompanying drawings. The embodiments are given for illustrative purposes only and should not be construed as limiting the utility model. The accompanying drawings are for reference and illustration only and do not constitute a limitation on the scope of patent protection of this utility model, because many changes can be made to this utility model without departing from the spirit and scope of this utility model.

[0036] This utility model provides an electric bulldozer, such as Figures 1-7As shown, in this embodiment, it includes a main frame 1, a power system 2, and an electrical system assembly 3, wherein the power system 2 and the electrical system assembly 3 are electrically connected;

[0037] The power system 2 includes a first battery assembly 21 and a second battery assembly 22, wherein the first battery assembly 21 and the second battery assembly 22 are connected in parallel;

[0038] The front end of the main frame 1 extends forward to install the first battery assembly 21, the middle part is recessed to install the second battery assembly 22, and the rear end extends backward to form a bracket to support the electrical system assembly 3.

[0039] In this embodiment, the first battery assembly 21 includes at least one set of first battery packs 211 and at least one set of battery mounting brackets 212: the battery mounting brackets 212 have mounting cavities, the first battery packs 211 are horizontally mounted in the mounting cavities of the battery mounting brackets 212, their terminals point to the side, and are electrically connected to the electrical system assembly 3 through lines; at least one set of the battery mounting brackets 212 are arranged horizontally in multiple layers at the front end of the main frame 1.

[0040] In this embodiment, the first battery packs 211 are connected in series in pairs; an MSD physical switch is provided at the terminal of the first battery pack 211, and the first battery pack 211 is electrically connected to another set of first battery packs 211 through the MSD physical switch.

[0041] In this embodiment, the battery mounting bracket 212 includes an upper cover and a lower cover. The assembly relationship between the upper cover and the lower cover is a conventional technique in this field and will not be described in detail in this embodiment.

[0042] Preferably, the first battery pack 211 has at least two columns arranged in the vertical direction.

[0043] See Figure 3 , Figure 6 Taking a battery mounting bracket 212 horizontally mounting two sets of first battery packs 211 as an example, two rows of first battery packs 211 are formed. The first battery packs 211 in each row are connected in series to form branch one and branch two, and branch one and branch two are connected in parallel. During maintenance, the MSD physical switch on the battery pack can be plugged and unplugged to disconnect the circuit of branch one / branch two. Generally, the MSD of the middle battery pack is disconnected. At least one MSD physical switch on each branch should be plugged and unplugged to perform battery pack maintenance (such as disassembly).

[0044] In this embodiment, a battery mounting bracket 212 is used to stack and install the first battery pack 211, which effectively improves the space utilization efficiency of the whole vehicle and the installation stability of the battery pack. The first battery pack 211 is installed horizontally in the mounting cavity of the battery mounting bracket 212, so as to be electrically connected to another set of first battery packs 211 through the MSD physical switch. The horizontal arrangement facilitates wiring and plugging and unplugging of MSD, which can improve the maintenance convenience of the battery pack.

[0045] In this embodiment, the second battery assembly 22 includes at least one set of horizontal battery packs 221 and at least one set of vertical battery packs 222. The vertical battery packs 222 are radially mounted on the main frame 1, with their terminals pointing to the rear / front end, and are electrically connected to the horizontal battery packs 221 or the electrical system assembly 3 via lines. The horizontal battery packs 221 are horizontally mounted on the main frame 1 and positioned on top of the vertical battery packs 222, with their terminals pointing to the side, and are electrically connected to the vertical battery packs 222 / electrical system assembly 3 via lines.

[0046] In this embodiment, the horizontal battery pack 221 and the vertical battery pack 222 are connected in series. MSD physical switches (i.e., maintenance service switches) are provided at the wiring terminals of the horizontal battery pack 221 and the vertical battery pack 222. The horizontal battery pack 221 / vertical battery pack 222 is electrically connected to another set of vertical battery pack 222 / horizontal battery pack 221 through the MSD physical switches.

[0047] See Figure 3 , Figure 6 Taking two sets of horizontal battery packs 221 and two sets of vertical battery packs 222 as an example, the two sets of vertical battery packs 222 are stacked in the battery bracket formed by the main bracket, and the two sets of horizontal battery packs 221 are horizontally arranged on the battery bracket and set on top of the vertical battery packs 222.

[0048] Since the horizontal battery pack 221 and the vertical battery pack 222 are directly connected in series to form branch three, branch three can be disconnected during maintenance by plugging and unplugging the MSD physical switches on the horizontal battery pack 221 and the vertical battery pack 222. Generally, to disconnect the MSD of the middle battery pack (i.e., the horizontal battery pack 221), at least one MSD physical switch on the battery pack should be plugged and unplugged, thus enabling battery pack maintenance (e.g., disassembly).

[0049] Branch 3, consisting of the horizontal battery pack 221 and the vertical battery pack 222, is connected in parallel with Branch 1 and Branch 2.

[0050] In this embodiment, at least one set of horizontal battery packs 221 and at least one set of vertical battery packs 222 are simultaneously arranged in the middle of the limited main frame 1, which further utilizes the limited space to install the number of batteries, thereby improving the range. Among them, the bottom is set as the radially mounted vertical battery pack 222, which can provide clearance for hydraulic lines and cables. The horizontal battery pack 221 is arranged on the upper part of the vertical battery pack 222 to maximize the use of space. And the series connection between the vertical battery pack 222 and the horizontal battery pack 221 is realized by the MSD physical switch, which can facilitate the insertion and removal of the MSD, thereby reducing the difficulty of maintenance.

[0051] In this embodiment, the electrical system assembly 3 includes a battery high-voltage box 31, a pump motor controller 32, a pump motor assembly 33, a walking motor 34, and a multi-function controller 35. The battery high-voltage box 31 is electrically connected to the multi-function controller 35 and the power system 2. The multi-function controller 35 is electrically connected to the pump motor controller 32 and the walking motor 34. The pump motor controller 32 is electrically connected to the pump motor assembly 33.

[0052] In this embodiment, two sets of walking tracks 4 and drive wheels 5 are also included. The drive wheels 5 are mounted on the main frame 1, with their inner side rotatably connected to the walking motor 34 and their outer side rotatably connected to the walking tracks 4.

[0053] Preferably, two sets of walking motors 34 are provided to provide power support for two sets of walking tracks 4 respectively.

[0054] In this embodiment, the left and right walking tracks 4 are independently driven by two sets (each set has one or more motors) of walking motors 34. Through direct motor drive, efficient and precise drive control is achieved, which is also conducive to the execution of braking energy recovery.

[0055] In this embodiment, a driver's cab 6 is also included, and an upwardly extending support frame is provided in the middle of the main frame 1 to support the driver's cab 6, such as... Figure 3 Support frame a and support frame b are included.

[0056] The pump motor assembly 33 is installed in the middle of the rear end of the cab 6, and the pump motor controller 32 and the battery high voltage box 31 are stacked on top of it.

[0057] In this embodiment, the electrical system assembly 3 further includes a water-cooled unit 36 ​​electrically connected to the multi-function controller 35. The water-cooled unit 36 ​​and the multi-function controller 35 are arranged vertically and positioned on the left rear end of the cab 6.

[0058] In this embodiment, a hydraulic oil tank 7 and an oil pump are also included. The hydraulic oil tank 7 is installed on the right rear end of the cab 6, and the oil pump is electrically connected to the pump motor assembly 33.

[0059] The oil pump is connected to the vehicle's hydraulic system, which is a standard feature in this field and will not be described further in this embodiment.

[0060] In this embodiment, high-voltage components such as the battery high-voltage box 31, pump motor controller 32, pump motor assembly 33, travel motor 34, multi-function controller 35, and water-cooled unit 36 ​​are stacked and installed at the rear of the cab 6, which optimizes the overall vehicle layout, improves accessibility, and effectively enhances the convenience of vehicle maintenance.

[0061] In this embodiment, a vehicle shell 8 is also included, which covers the outer surface of the main frame 1, the power system 2 and the electrical system assembly 3. Access doors can be provided as needed to facilitate module maintenance. This is a conventional feature in the art and will not be described in detail in this embodiment.

[0062] In actual application tests, based on the same tonnage of the complete vehicle, the electric bulldozer described in this embodiment can achieve various specifications such as 466kwh, 528kwh, 600kwh, and 620kwh, thereby meeting the user's range requirements. Pure electric drive, clean energy, and achieve high efficiency, energy saving and environmental protection effects.

[0063] This utility model embodiment designs a power system 2 consisting of a first battery assembly 21 and a second battery assembly 22. The first battery assembly 21 and the second battery assembly 22 are distributed and installed at the front and middle of the main frame 1, making full use of the vehicle space to arrange large-capacity batteries, improving the utilization efficiency of the vehicle space, effectively improving the vehicle's range, and balancing the vehicle's center of gravity distribution, thereby enhancing the stability and safety of the equipment during driving and operation. By placing the electrical system assembly at the rear of the main frame, the difficulty of maintenance can be effectively reduced.

[0064] The above embodiments are preferred embodiments of the present utility model, but the embodiments of the present utility model are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present utility model shall be considered equivalent substitutions and shall be included within the protection scope of the present utility model.

Claims

1. An electric bulldozer, characterized in that: It includes a main frame, a power system, and an electrical system assembly, wherein the power system is electrically connected to the electrical system assembly; The power system includes a first battery assembly and a second battery assembly; The front end of the main frame extends forward to install the first battery assembly, the middle part sinks down to install the second battery assembly, and the rear end extends backward to form a bracket to support the electrical system assembly.

2. The electric bulldozer as described in claim 1, characterized in that: The first battery assembly includes at least one set of first battery packs and at least one set of battery mounting brackets: the battery mounting brackets have mounting cavities, the first battery packs are horizontally mounted in the mounting cavities of the battery mounting brackets, their terminals point to the side, and are electrically connected to the electrical system assembly through lines; at least one set of the battery mounting brackets are arranged horizontally in multiple layers at the front end of the main frame.

3. An electric bulldozer as described in claim 2, characterized in that: The first battery packs are connected in series in pairs; an MSD physical switch is provided at the terminal of the first battery pack, and the first battery pack is electrically connected to another set of first battery packs through the MSD physical switch.

4. An electric bulldozer as described in claim 1, characterized in that: The second battery assembly includes at least one set of horizontal battery packs and at least one set of vertical battery packs. The vertical battery packs are radially mounted on the main frame, with their terminals pointing to the rear / front end, and are electrically connected to the horizontal battery packs or electrical system assembly via wiring. The horizontal battery packs are horizontally mounted on the main frame and positioned on top of the vertical battery packs, with their terminals pointing to the side, and are electrically connected to the vertical battery packs / electrical system assembly via wiring.

5. An electric bulldozer as described in claim 4, characterized in that: The horizontal battery pack and the vertical battery pack are connected in series. An MSD physical switch is provided at the wiring terminals of the horizontal battery pack and the vertical battery pack. The horizontal battery pack / vertical battery pack is electrically connected to another set of the vertical battery pack / horizontal battery pack through the MSD physical switch.

6. An electric bulldozer as described in claim 1, characterized in that: The electrical system assembly includes a battery high-voltage box, a pump motor controller, a pump motor assembly, a travel motor, and a multi-function controller. The battery high-voltage box is electrically connected to the multi-function controller and the power system. The multi-function controller is electrically connected to the pump motor controller and the travel motor. The pump motor controller is electrically connected to the pump motor assembly.

7. An electric bulldozer as described in claim 6, characterized in that: It also includes two sets of walking tracks and drive wheels. The drive wheels are mounted on the main frame, with their inner side rotatably connected to the walking motor and their outer side rotatably connected to the walking tracks.

8. An electric bulldozer as described in claim 6, characterized in that: It also includes a driver's cab, and the main frame has an upwardly extending support frame in the middle to support the driver's cab; The pump motor assembly is installed in the middle of the rear end of the cab, and the pump motor controller and the battery high-voltage box are stacked on top of it in sequence.

9. An electric bulldozer as described in claim 8, characterized in that: The electrical system assembly also includes a water-cooled unit electrically connected to the multi-function controller. The water-cooled unit and the multi-function controller are arranged vertically and positioned on the left rear end of the cab.

10. An electric bulldozer as described in claim 8, characterized in that: It also includes a hydraulic oil tank and an oil pump, the hydraulic oil tank being installed on the right rear end of the cab, and the oil pump being electrically connected to the pump motor assembly.

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