Power transmission system for a bulldozer and bulldozer

Abstract

The utility model relates to the field of bulldozers, in particular to a power transmission system for bulldozers and bulldozers. The power transmission system comprises: an engine; a transfer case, a first clutch is arranged between the engine and the transfer case; a hydraulic pump, connected with the transfer case, a second clutch is arranged between the transfer case and the hydraulic pump; a final drive structure, connected with the hydraulic motor, and the hydraulic motor is connected with the hydraulic pump; a generator, drivingly connected with the transfer case, and configured to generate electricity or drive the transfer case to act under the driving of the transfer case; a third clutch is arranged between the generator and the transfer case, and the generator is electrically connected with a power battery. The power transmission system for bulldozers can realize multi-mode hybrid power driving, and enhance the fuel economy of the vehicle; meanwhile, the engine and the generator both transmit power through the transfer case, and can more conveniently realize electricity generation, pure electric driving and double-machine driving mode.

Description

Technical Field

[0001] This utility model relates to the field of bulldozers, specifically to a power transmission system for a bulldozer and a bulldozer. Background Technology

[0002] A bulldozer is an engineering vehicle mainly composed of a power transmission system, a main frame, working devices, and an electrical system. Based on the different power transmission systems, bulldozers can be broadly classified into three types: mechanical transmission bulldozers, hydraulic transmission bulldozers, and hydrostatic bulldozers.

[0003] When mechanical and hydraulic bulldozers are operating, the engine's power is transmitted to the tracks through components such as shock absorbers, hydraulic torque converters, gearboxes, and final drives. When hydrostatic bulldozers are operating, the engine's power is transmitted to the hydraulic pump and hydraulic motor through the transfer case, and then to the tracks. However, both of these transmission methods rely on the engine for power, resulting in poor fuel economy.

[0004] Therefore, a new technical solution is needed in this field to solve the above problems. Summary of the Invention

[0005] To improve or solve the technical problem of poor fuel economy in existing bulldozers that are solely driven by an engine, this utility model provides a power transmission system for bulldozers. The power transmission system includes: an engine; a transfer case, driven by the engine, with a first clutch disposed between the engine and the transfer case; a hydraulic pump, connected to the transfer case, with a second clutch disposed between the transfer case and the hydraulic pump; a final drive structure, connected to a hydraulic motor, and the hydraulic motor is connected to the hydraulic pump; a generator, driven by the transfer case, configured to generate electricity or drive the transfer case under the action of the transfer case; and a third clutch disposed between the generator and the transfer case, the generator being electrically connected to a power battery.

[0006] The power transmission system for bulldozers of this invention includes an engine, a transfer case, a hydraulic pump, a hydraulic motor, a final drive structure, a generator, and a power battery. The engine, transfer case, generator, and power battery are connected sequentially, enabling independent power generation to charge the power battery. Alternatively, the power battery, generator, transfer case, hydraulic pump, and hydraulic motor can be connected sequentially for pure electric drive, with the power battery providing power and the generator acting as the motor. Another configuration involves the engine, transfer case, generator, and power battery being connected sequentially to charge the power battery, and the transfer case being connected sequentially to the hydraulic pump and hydraulic motor to drive the engine, meaning the engine simultaneously drives and generates electricity. The power battery provides power to the generator, and both the generator and engine are connected to the transfer case, allowing both to simultaneously power the transfer case, achieving synchronous dual-engine drive. Through this configuration, the power transmission system for bulldozers of this invention, with its generator, engine, and multiple clutches, enables multi-mode hybrid drive, enhancing vehicle fuel economy. Furthermore, since both the engine and generator transmit power through the transfer case, it conveniently achieves power generation, pure electric drive, and dual-engine drive modes.

[0007] Furthermore, the transfer case includes a first end connected to the engine, a second end connected to the hydraulic pump, and a third end connected to the generator.

[0008] Furthermore, the final drive structure is a tracked walking structure, which includes a drive wheel, a guide wheel, and a track structure; the drive wheel is connected to the hydraulic motor.

[0009] To improve or solve the technical problem of poor fuel economy in existing bulldozers that are solely driven by engines, this utility model provides a bulldozer. The bulldozer includes a chassis; and any of the aforementioned power transmission systems for bulldozers, the power transmission system being mounted on the chassis.

[0010] In summary, compared with the prior art, this utility model has the following beneficial effects: (1) The generator, engine and multiple clutches are set up to realize multi-mode hybrid drive and enhance the fuel economy of the vehicle; at the same time, the engine and generator transmit power through the transfer case, which can easily realize the power generation, pure electric drive and dual-motor drive modes. (2) It adopts hydrostatic transmission, which is flexible in operation and can adapt to complex working conditions. Attached Figure Description

[0011] The preferred embodiments of this utility model are described below with reference to the accompanying drawings, in which: Figure 1 This is a schematic diagram of an embodiment of the power transmission system of this utility model for a bulldozer.

[0012] List of reference numerals in the attached diagram: 1. Engine; 2. First clutch; 3. Transfer case; 4. Second clutch; 5. Hydraulic pump; 6. Hydraulic motor; 7. Final drive structure; 8. Third clutch; 9. Generator; 10. Power battery. Detailed Implementation

[0013] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0014] It should be noted that in the description of this utility model, the terms "upper," "lower," "left," "right," "inner," and "outer," which indicate directional or positional relationships, are based on the directional or positional relationships shown in the accompanying drawings. These are merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0015] Furthermore, it should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "setting," 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, an indirect connection through an intermediate medium, or a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0016] To improve or solve the technical problem of poor fuel economy in existing bulldozers that are solely driven by an engine, this utility model provides a power transmission system for bulldozers. The power transmission system includes: an engine 1; a transfer case 3, connected to the engine 1, with a first clutch 2 between the engine 1 and the transfer case 3; a hydraulic pump 5, connected to the transfer case 3, with a second clutch 4 between the transfer case 3 and the hydraulic pump 5; a final drive structure 7, connected to a hydraulic motor 6, and the hydraulic motor 6 is connected to the hydraulic pump 5; a generator 9, connected to the transfer case 3, and configured to generate electricity or drive the transfer case 3 under the influence of the transfer case 3; a third clutch 8 between the generator 9 and the transfer case 3; and a power battery 10 electrically connected to the generator 9.

[0017] Figure 1 This is a schematic diagram of an embodiment of the power transmission system of this utility model for a bulldozer. Figure 1As shown, in one or more embodiments, the power transmission system of this utility model for a bulldozer includes an engine 1, a transfer case 3, a hydraulic pump 5, a hydraulic motor 6, a final drive structure 7, a generator 9, and a power battery 10.

[0018] See also Figure 1 In one or more embodiments, engine 1 is driven by transfer case 3. A first clutch 2 is provided between engine 1 and transfer case 3, and the opening and closing of the first clutch 2 controls the transmission between engine 1 and transfer case 3. When the first clutch 2 is engaged, power from engine 1 is transmitted to transfer case 3; when the first clutch 2 is disengaged, power from engine 1 cannot be output to transfer case 3. Hydraulic pump 5 is connected to transfer case 3, and a second clutch 4 is provided between hydraulic pump 5 and transfer case 3. The opening and closing of the second clutch 4 controls the transmission between hydraulic pump 5 and transfer case 3. When the second clutch 4 is engaged, power is transmitted to hydraulic pump 5 via transfer case 3; when the second clutch 4 is disengaged, transfer case 3 is isolated from hydraulic pump 5, and power cannot be transmitted to hydraulic pump 5. Generator 9 is driven by transfer case 3, and a third clutch 8 is provided between generator 9 and transfer case 3. The opening and closing of the third clutch 8 controls the transmission between generator 9 and transfer case 3. When the third clutch 8 engages, the generator 9 is connected to the transfer case 3, and power is transmitted from or to the generator 9 via the transfer case 3. The generator 9 is connected to a power battery 10, which stores electrical energy when the generator 9 generates electricity and supplies power to the generator 9 when drive is needed. The generator 9 acts as a motor, delivering power to the transfer case 3. Furthermore, the generator 9 can be equipped with a kinetic energy recovery system to recover braking energy and electrical energy.

[0019] See also Figure 1 In one or more embodiments, the transfer case 3 includes a first end connected to the engine 1, a second end connected to the hydraulic pump 5, and a third end connected to the generator 9. Exemplarily, the transfer case 3 includes a first drive shaft and a second drive shaft, with the first and second ends located at opposite ends of the first drive shaft. The second drive shaft and the first drive shaft are connected by a gear set, and the third end is located on the second drive shaft. Rotation of the first drive shaft can drive the second drive shaft to rotate, and vice versa. Further, the final drive structure 7 is a tracked structure, including a drive wheel, a guide wheel, and a track structure. Specifically, the final drive structure 7 also includes a track frame, on which the drive wheel and guide wheel are mounted. The track structure is a chain structure, meshing with the drive wheel and guide wheel. The hydraulic motor 6 is connected to the drive wheel and can drive the drive wheel to rotate, thereby driving the final drive structure 7 to move.

[0020] The working principle of this utility model is as follows: Independent power generation mode: The power of engine 1 is transmitted to generator 9 via transfer case 3. Generator 9 generates electricity in the forward direction and stores the electricity in power battery 10. At this time, first clutch 2 and third clutch 8 are engaged, and second clutch 4 is disengaged. Pure electric drive mode: The power of the power battery 10 is delivered to the generator 9, the generator 9 reverses, and the power of the generator 9 is transmitted to the hydraulic motor 6 through the transfer case 3 and the hydraulic pump 5 in sequence, which in turn drives the final drive structure 7 to move; at this time, the first clutch 2 is disengaged, and the third clutch 8 and the second clutch 4 are engaged. Single-machine drive and power generation mode: The power of engine 1 is transmitted to hydraulic motor 6 through transfer case 3 and hydraulic pump 5, which in turn drives final drive structure 7 to move. At the same time, the power of engine 1 is transmitted to generator 9 through transfer case 3. Generator 9 generates electricity in the forward direction and stores the electricity in power battery 10. At this time, first clutch 2, second clutch 4 and third clutch 8 are engaged. Dual-engine synchronous drive mode: The power of engine 1 is transmitted to transfer case 3, and at the same time, generator 9 reverses and the power of generator 9 is also transmitted to transfer case 3. The power of engine 1 and generator 9 is transmitted to hydraulic motor 6 through transfer case 3 and hydraulic pump 5, which in turn drives final drive structure 7 to move; at this time, first clutch 2, second clutch 4 and third clutch 8 are engaged. Energy recovery mode: When the vehicle brakes, generator 9 recovers electrical energy.

[0021] To improve or solve the technical problem of poor fuel economy in existing bulldozers that are solely driven by engines, this utility model provides a bulldozer. The bulldozer includes a chassis and the aforementioned power transmission system for the bulldozer, with the power transmission system mounted on the chassis.

[0022] It is understood that a bulldozer includes a frame, power transmission system, hydraulic system, cab, and working device. The power transmission system, hydraulic system, cab, and working device are mounted on the frame. The working device includes a bulldozer blade and a blade. The hydraulic system is used to control the raising, lowering, and tilting of the bulldozer blade. The cab integrates a control console and mounting facilities. This new bulldozer, by setting up the aforementioned power transmission system, can achieve multi-mode hybrid drive, enhancing the vehicle's fuel economy; simultaneously, both the engine and generator transmit power through a transfer case, enabling relatively convenient implementation of generator-driven, pure electric drive, and dual-engine drive modes.

[0023] The technical solution of this utility model has been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the protection scope of this utility model is obviously not limited to these specific embodiments. Without departing from the principle of this utility model, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will all fall within the protection scope of this utility model.

Claims

1. A power transmission system for a bulldozer, characterized in that, include: Engine (1); The transfer case (3) is connected to the engine (1) in a transmission, and a first clutch (2) is provided between the engine (1) and the transfer case (3); A hydraulic pump (5) is connected to the transfer case (3), and a second clutch (4) is provided between the transfer case (3) and the hydraulic pump (5); The final drive structure (7) is connected to a hydraulic motor (6), and the hydraulic motor (6) is connected to the hydraulic pump (5); A generator (9) is connected to the transfer case (3) and configured to generate electricity or drive the transfer case (3) to operate under the drive of the transfer case (3); a third clutch (8) is provided between the generator (9) and the transfer case (3), and the generator (9) is electrically connected to a power battery (10).

2. The power transmission system for a bulldozer according to claim 1, characterized in that, The transfer case (3) includes a first end connected to the engine (1), a second end connected to the hydraulic pump (5), and a third end connected to the generator (9).

3. The power transmission system for a bulldozer according to claim 1, characterized in that, The final drive structure (7) is a tracked walking structure, which includes a drive wheel, a guide wheel and a track structure; the drive wheel is connected to the hydraulic motor (6).

4. A bulldozer, characterized in that, include: Frame; and The power transmission system for a bulldozer according to any one of claims 1-3, wherein the power transmission system is mounted on the chassis.

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