Electric drive bulldozer transmission system and bulldozer

Abstract

The utility model relates to the field of engineering machinery, in particular to an electrically-driven bulldozer transmission system and a bulldozer. The transmission system comprises an output mechanism; the planetary mechanism comprises a planet carrier connected with the output mechanism, a sun gear meshed with the planet carrier and an inner gear ring; the main motor is connected with the sun gear and is configured to drive the sun gear to rotate; the steering motor is connected with the inner gear ring and is configured to drive the inner gear ring to rotate; the sun gear and the ring gear are configured to converge power at the planet carrier. According to the transmission system of the electrically-driven bulldozer, the requirements for power and torque of all the motors can be reduced in a motor power confluence mode, and therefore the comprehensive cost of the transmission system is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of engineering machinery, concretely relates to a kind of electric drive bulldozer transmission system and bulldozer. BACKGROUND

[0002] With the rapid development of new energy technology, major engineering machinery manufacturers are developing new energy engineering machinery. As a power source, the motor is completely different from the engine in terms of speed and torque external characteristic curve, high-efficiency working area and other performance parameters. New energy engineering machinery must have a matching transmission system.

[0003] The Chinese utility model patent with publication number CN211592261U discloses a driving system for bulldozer and a bulldozer with the same. The driving system includes a running motor for driving the bulldozer to walk and work, a gearbox connected with the output end of the running motor, a steering motor for driving the bulldozer to steer, and a power battery electrically connected with the running motor and the steering motor. The gearbox is connected with the final drive structure of the bulldozer. However, the walking and working of the bulldozer in this driving system entirely rely on the running motor, which requires high power for the running motor, resulting in high comprehensive cost of the entire driving system.

[0004] Therefore, there is a need in the art for a new technical solution to solve the above problems. SUMMARY

[0005] To improve or solve the technical problem in the prior art that the driving system requires high power for the running motor, resulting in high comprehensive cost of the entire driving system, the utility model provides an electric drive bulldozer transmission system. The transmission system includes: an output mechanism; a planetary mechanism including a planetary carrier connected with the output mechanism, a sun gear engaged with the planetary carrier, and an inner ring gear; a main motor connected with the sun gear and configured to drive the sun gear to rotate; a steering motor connected with the inner ring gear and configured to drive the inner ring gear to rotate; and the sun gear and the inner ring gear are configured to power converge at the planetary carrier.

[0006] The utility model relates to an electric drive bulldozer transmission system, including output mechanism, planetary mechanism, main motor and steering motor. Among them, the output mechanism is suitable for being connected with the wheel, is used for driving bulldozer to walk and operation. Planetary mechanism includes planet carrier, sun gear and inner toothed ring, and planet carrier is connected with output structure, and sun gear is connected with main motor, and inner toothed ring is connected with steering motor, and main motor drives sun gear rotation, and steering motor drives inner toothed ring rotation, and sun gear and inner toothed ring form power confluence at planet carrier, and planet carrier is driven in rotation together, can reduce the power requirement of transmission system to each motor, thereby reducing the comprehensive cost of transmission system. Through the above-mentioned setting, the utility model relates to an electric drive bulldozer transmission system through the power confluence mode of motor, can reduce the power requirement of each motor, thereby reducing the comprehensive cost of transmission system.

[0007] Further, a first reduction gear set is arranged between the main motor and the sun gear.

[0008] Further, the output mechanism comprises an output shaft, a second reduction gear set connecting the output shaft and the planet carrier, and a brake connected with the planet carrier.

[0009] Further, the steering motor comprises a left steering motor and a right steering motor, the planetary mechanism comprises a left planetary mechanism corresponding to the left steering motor and a right planetary mechanism corresponding to the right steering motor, and the output mechanism comprises a left output mechanism corresponding to the left planetary mechanism and a right output mechanism corresponding to the right planetary mechanism.

[0010] In order to improve or solve the technical problem that the power requirement of the driving system to the operating motor is high in the prior art, resulting in high comprehensive cost of the entire driving system, the utility model provides a bulldozer. The bulldozer comprises a main body, a control system, and the electric drive bulldozer transmission system of any one of the above, and the electric drive bulldozer transmission system is installed on the main body.

[0011] Further, the control system comprises a vehicle controller, a motor controller connected with the vehicle controller, an operating handle, and a brake pedal, the motor controller is connected with the main motor and the steering motor of the electric drive bulldozer transmission system, and the brake pedal is connected with the brake of the electric drive bulldozer transmission system.

[0012] Compared with the prior art, the utility model has the following beneficial effects:

[0013] (1) The planetary mechanism comprises a planet carrier, a sun gear and an inner ring gear, the planet carrier is connected with the output structure, the sun gear is connected with the main motor, and the inner ring gear is connected with the steering motor; the main motor drives the sun gear to rotate, the steering motor drives the inner ring gear to rotate, and the sun gear and the inner ring gear form a power flow at the planet carrier, thereby driving the planet carrier to rotate, which can reduce the power requirement of the transmission system on each motor, thereby reducing the comprehensive cost of the transmission system.

[0014] (2) The first and second reduction gear sets are arranged, which can increase the torque by reducing the speed, thereby reducing the torque requirement of the main motor and further reducing the comprehensive cost of the transmission system. BRIEF DESCRIPTION OF DRAWINGS

[0015] The preferred embodiments of the utility model will be described below with reference to the drawings, in which:

[0016] Figure 1 is a schematic view of an embodiment of the utility model of an electrically driven bulldozer transmission system.

[0017] LIST OF REFERENCE NUMBERS: 1, main motor; 2, left steering motor; 3, right steering motor; 4, left brake; 5, right brake; 6, first reduction gear set; 7, left sun gear; 8, left planet carrier; 9, left inner ring gear; 10, right sun gear; 11, right planet carrier; 12, right inner ring gear; 13, left second reduction gear set; 14, left output shaft; 15, right second reduction gear set; 16, right output shaft. DETAILED DESCRIPTION

[0018] The preferred embodiments of the utility model will be described below with reference to the drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the utility model, and are not intended to limit the protection scope of the utility model.

[0019] It should be noted that in the description of the utility model, the terms "upper", "lower", "left", "right", "inner", "outer" and the like indicate the direction or positional relationship of the terms based on the direction or positional relationship shown in the drawings, which is only for the convenience of description, and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first" and "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0020] In addition, it needs to be explained that, in the description of the utility model, unless another explicit provision and limitation, the term "mounting", "setting", "connection" should be broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrally connected, can be direct connection, also can be indirect connection through the intermediate medium, also can be two element internal communication. For the person skilled in the art, the above-mentioned term can be understood according to the specific meaning in the utility model.

[0021] Bulldozer: self-propelled tracked or wheeled machine, its working device can install bulldozing device, through the advancing movement of machine, earthmoving, pushing and leveling material can also be installed to generate thrust or traction force auxiliary device. Mainly for tracked bulldozer. Bulldozer generally within 100m haulage distance earthmoving loose material. The general operation process is as follows: start advancing, loosen material is earthmoving during walking, direction is adjusted by using steering, deceleration braking is carried out after reaching the end point, switching to reverse and returning to the starting point, starting the next operation cycle. Special circumstances require turning in place, emergency braking and other actions.

[0022] With the rapid development of new energy technology, major engineering machinery host factory is developing new energy engineering machinery. Motor as power source, in the speed and torque external characteristic curve, high efficiency work area and other performance parameters, completely different from engine, new energy engineering machinery must have the matching transmission system.

[0023] In order to improve or solve the technical problem that the power demand of the driving system to the operating motor is high in the prior art, resulting in the high comprehensive cost of the whole driving system, the utility model provides a kind of electric drive bulldozer transmission system. The transmission system includes: output mechanism;Planetary mechanism, including the planetary carrier connected with the output mechanism, the sun gear engaged with the planetary carrier and the inner ring gear;Main motor 1, connected with the sun gear, and configured to drive the sun gear to rotate;Steering motor, connected with the inner ring gear, and configured to drive the inner ring gear to rotate;The sun gear and the inner ring gear are configured to power converge at the planetary carrier.

[0024] Figure 1 It is the schematic diagram of the embodiment of the utility model a kind of electric drive bulldozer transmission system. As shown in Figure 1 In one or more embodiments, the utility model a kind of electric drive bulldozer transmission system includes output mechanism, planetary mechanism, main motor 1 and steering motor.

[0025] Continued to refer to Figure 1The main motor 1 is connected with the planetary mechanism. In one or more embodiments, a first reduction gear set 6 is arranged between the main motor 1 and the planetary mechanism. The power of the main motor 1 is transmitted to the planetary mechanism after being reduced and increased in torque by the first reduction gear set 6. The first reduction gear set 6 is a straight-toothed reduction gear set, for example. Further, the steering motor is connected with the planetary mechanism. The steering motor includes a left steering motor 2 and a right steering motor 3. Specifically, the steering motor is connected with the planetary mechanism through a gear set. The power of the steering motor is transmitted to the planetary mechanism after being transmitted through the gear set.

[0026] Continuing to refer to Figure 1 The planetary mechanism includes a left planetary mechanism and a right planetary mechanism. The left planetary mechanism is connected with the left steering motor 2 and the first reduction gear set 6. The right planetary mechanism is connected with the right steering motor 3 and the first reduction gear set 6. The left planetary mechanism and the right planetary mechanism are symmetrical structures. Here, the left planetary mechanism is taken as an example for description. In one or more embodiments, the left planetary mechanism includes a left planetary carrier 8 connected with an output mechanism, a left sun gear 7 connected with the main motor 1, and a left inner ring gear 9 connected with the left steering motor 2. The rotational speeds of the left planetary carrier 8, the left sun gear 7, and the left inner ring gear 9 affect each other, and the torques are in a certain proportion. When power is input from multiple power sources, the output torque cannot be changed, but power can be combined by changing the rotational speed. Specifically, the power of the main motor 1 is transmitted to the left sun gear 7 after being reduced and increased in torque. The power of the left steering motor 2 is transmitted to the left inner ring gear 9 after being transmitted through the gear set. The power of the left sun gear 7 and the left inner ring gear 9 is combined at the left planetary carrier 8. The power transmitted to the left planetary carrier 8 is transmitted to the output mechanism through a planetary carrier shaft of the left planetary carrier 8, thereby driving the bulldozer. It can be understood that the main motor 1 is torque-controlled, which determines the torque of the planetary mechanism and further determines the tractive force of the bulldozer. The left steering motor 2 and the right steering motor 3 are speed-controlled, which can change the output rotational speed of the planetary mechanism and further determine the speed of the left and right sides of the bulldozer. Further, the right planetary mechanism includes a right planetary carrier 11 connected with the output mechanism, a right sun gear 10 connected with the main motor 1, and a right inner ring gear 12 connected with the right steering motor 3.

[0027] Continuing to refer to Figure 1The output mechanism is connected with the planetary mechanism. In one or more embodiments, the output mechanism comprises a left output mechanism connected with the left planetary mechanism, and a right output mechanism connected with the right planetary mechanism. The left output mechanism and the right output mechanism are symmetrical structures, and the left output mechanism is taken as an example for description. In one or more embodiments, the left output mechanism comprises a left output shaft 14, a left second reduction gear set 13 connecting the left output shaft 14 with the left planetary carrier 8, and a left brake 4 connected with the left planetary carrier 8. Specifically, the left brake 4 is installed on a planetary carrier shaft of the left planetary carrier 8. The left brake 4 is a parking brake, which is used for braking when the bulldozer is not working and the whole vehicle is powered off, to ensure safety. Further, the right output mechanism comprises a right output shaft 16, a right second reduction gear set 15 connecting the right output shaft 16 with the right planetary carrier 11, and a right brake 5 connected with the right planetary carrier 11.

[0028] In order to improve or solve the technical problem that the power demand of the driving system on the operating motor is high in the prior art, resulting in high comprehensive cost of the whole driving system, the utility model provides a bulldozer. The bulldozer comprises a main body, a control system and an electrically-driven bulldozer transmission system of any one of the above.

[0029] Continuing to refer to Figure 1 In one or more embodiments, the control system comprises a whole vehicle controller, a motor controller connected with the whole vehicle controller, an operation handle and a brake pedal. The motor controller is connected with the main motor 1, the left steering motor 2 and the right steering motor 3. The brake pedal is connected with the brake. The whole vehicle controller reads the signals such as rotation speed and torque fed back by the operation handle, the brake pedal and the motor controller, understands the state of the whole vehicle, controls the main motor 1, the left steering motor 2 and the right steering motor 3 respectively, to realize the functions such as bulldozing walking, normal steering, in-situ steering, deceleration braking and emergency braking. The brake realizes the function of parking brake. The whole vehicle controller can determine the current vehicle speed and load condition of the whole vehicle through formula calculation by reading the rotation speed and torque signals fed back by the motors, and feeds back to the driver through the display screen. The driver combines the operation demand, sends the next instruction to the whole vehicle controller through the operation handle and the brake pedal, and the whole vehicle controller controls the motors to execute. Specifically, the driver can switch the direction gear, the lifting speed gear and steer left and right through the operation handle. The direction gear comprises forward, reverse and neutral. The speed gear is divided into multiple gears, corresponding to different speed intervals of the whole vehicle, and is switched through the lifting gear. Different steering amplitudes of the operation handle correspond to different steering radii, and the limit position of the operation handle corresponds to in-situ steering. The driver performs braking operation through the brake pedal, different amplitudes correspond to different braking forces, and the limit position corresponds to emergency braking. Further, the main motor 1, the left steering motor 2 and the right steering motor 3 are further connected with a battery. The control system further comprises a battery controller connected with the battery.

[0030] The various action implementation processes of the bulldozer are as follows:

[0031] The controller acquires the operation handle and brake pedal signals, and judges the next action of the bulldozer;

[0032] When the next action is bulldozing walking, the driver performs handle operation, the vehicle controller reads the direction and gear signals, and determines the motor torque and rotation direction, target vehicle speed; then the steering motor is controlled to rotate at a constant speed, the main motor 1 torque rises or falls according to the target vehicle speed and the current vehicle speed ratio at a certain slope, until the vehicle speed reaches the target vehicle speed median, at this time the motor output torque is equal to the corresponding resistance of the target vehicle speed, reaching a temporary balance state; the left and right steering motors 3 are adjusted in speed according to the speed feedback, to avoid fluctuations in load, resulting in a decrease in vehicle speed, bulldozer deviation and the like;

[0033] When the next action is steering, the driver performs handle operation, and the vehicle controller judges whether it is normal steering or steering in place according to the signals; if it is normal steering, the speed difference of the two steering motors is adjusted according to the handle signal ratio; if it is steering in place, the rotation directions of the two steering motors on both sides are controlled to be opposite, so that the bulldozer left and right tracks are opposite in steering;

[0034] When the next action is braking, the driver performs brake pedal operation, and the vehicle controller judges whether it is deceleration braking or emergency braking according to the signals; if it is deceleration braking, the motor is controlled to perform kinetic energy recovery according to the pedal signal ratio, to brake at a reduced speed; if it is emergency braking, the main motor 1 changes the torque direction, the two side steering motors are reversed, and a larger reverse power is provided, so that the bulldozer stops quickly.

[0035] The technical scheme of the utility model has been described in combination with the preferred embodiments shown in the drawings, but it is easy for those skilled in the art to understand that the protection scope of the utility model is obviously not limited to these specific embodiments. Those skilled in the art can make equivalent changes or replacements to the related technical features without deviating from the principles of the utility model, and the technical cases after the changes or replacements will all fall within the protection scope of the utility model.

Claims

1. An electrically driven bulldozer drive system, characterized by, The transmission system comprises: an output mechanism; a planetary mechanism comprising a planetary carrier connected to the output mechanism, a sun gear engaged with the planetary carrier, and an inner ring gear; a main motor (1) connected to the sun gear and configured to drive the sun gear to rotate; a steering motor connected to the inner ring gear and configured to drive the inner ring gear to rotate; the sun gear and the inner ring gear are configured to power combine at the planetary carrier.

2. An electrically driven bulldozer drive system according to claim 1, wherein, A first reduction gear set (6) is arranged between the main motor (1) and the sun gear.

3. An electrically driven bulldozer drive system according to claim 1, wherein, The output mechanism comprises an output shaft, a second reduction gear set connecting the output shaft and the planetary carrier, and a brake connected to the planetary carrier.

4. An electrically driven bulldozer drive system according to claim 1, wherein, The steering motor comprises a left steering motor (2) and a right steering motor (3); the planetary mechanism comprises a left planetary mechanism corresponding to the left steering motor (2) and a right planetary mechanism corresponding to the right steering motor (3); the output mechanism comprises a left output mechanism corresponding to the left planetary mechanism and a right output mechanism corresponding to the right planetary mechanism.

5. A bulldozer characterized by, The transmission system comprises: a main body; a control system; and The electrically driven bulldozer transmission system of any one of claims 1-4 is installed on the main body.

6. A bulldozer according to claim 5, wherein The control system comprises a vehicle controller, a motor controller connected to the vehicle controller, an operating handle, and a brake pedal; the motor controller is connected to the main motor (1) and the steering motor of the electrically driven bulldozer transmission system; the brake pedal is connected to the brake of the electrically driven bulldozer transmission system.

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