KR102764052B1 - Driving System for Eco-Friendly Special Equipment that Can Operate Auxiliary Pumps All The Time - Google Patents

Abstract

The drive system of an eco-friendly special-purpose vehicle capable of constantly operating an auxiliary fluid pump according to the present invention comprises: a drive motor provided in an eco-friendly special-purpose vehicle to generate driving force; a first main drive shaft extending to one side of the drive motor; a second main drive shaft extending from the drive motor to the opposite side of the first main drive shaft and transmitting the driving force of the drive motor to the auxiliary fluid pump of the eco-friendly special-purpose vehicle; a wheel drive shaft connected to a wheel of the eco-friendly special-purpose vehicle; a gear assembly provided between the first main drive shaft and the wheel drive shaft and transmitting the driving force of the drive motor to the wheel drive shaft at a preset gear ratio; a reducer or transmission including a reverse gear; a power take-off device provided in the reducer or the transmission and selectively connected to the gear assembly to extract the driving force of the drive motor separately from the wheel drive shaft; and a clutch device provided in the first main drive shaft and selectively blocking or connecting the driving force of the drive motor transmitted to the gear assembly.

Description

{Driving System for Eco-Friendly Special Equipment that Can Operate Auxiliary Pumps All The Time}

The present invention relates to a drive system for an eco-friendly special-purpose vehicle, and more specifically, to a drive system for an eco-friendly special-purpose vehicle capable of maintaining the operating state of a bogie pump even when the driving force transmitted to the wheels of the eco-friendly special-purpose vehicle is cut off.

In the case of eco-friendly special-purpose vehicles such as eco-friendly electric trucks, a power take-off device (PTO) is provided to drive special-purpose equipment such as hydraulic pumps or water pumps, along with a drivetrain to drive the wheels of the vehicle.

However, the power take-off device of a conventional eco-friendly special vehicle has a method of additionally installing a separate power take-off device motor unrelated to the driving motor for driving the vehicle's wheels, as disclosed in Korean Patent No. 10-1848686.

This method has the problem of greatly reducing space efficiency because it requires a separate space for the power take-off unit and the motor to drive the power take-off unit within the vehicle. In addition, the manufacturing cost of the vehicle increases significantly due to the addition of a separate control system, such as an inverter to control the motor for the power take-off unit and related high-voltage/low-voltage wiring.

In addition, conventional eco-friendly special-purpose vehicles require a drive system to drive pumps such as the steering device, braking device, and air conditioning device required for vehicle operation in addition to the power take-off device, so they have separate motors to drive these, which aggravates the above-mentioned problems.

Therefore, a method to solve these problems is required.

Korean Patent No. 10-1848686

The present invention has been made to solve the problems of the above-described prior art, and has the purpose of providing a drive system for an eco-friendly special-purpose vehicle, which can improve space efficiency and reduce the vehicle manufacturing cost by having a power take-off device capable of extracting driving power without an additional motor separately provided from a drive motor for driving the wheels in an eco-friendly special-purpose vehicle.

In addition, the present invention has a purpose of providing a drive system for an eco-friendly special-purpose vehicle capable of maintaining the operating state of a bogie pump even when the driving power transmitted to the drive motor rotor wheel is cut off.

The tasks of the present invention are not limited to the tasks mentioned above, and other tasks not mentioned will be clearly understood by those skilled in the art from the description below.

In order to achieve the above object, the present invention provides a drive system for an eco-friendly special-purpose vehicle capable of constant operation of an auxiliary fluid pump, the drive system comprising: a drive motor provided in an eco-friendly special-purpose vehicle to generate driving force; a first main drive shaft extending to one side of the drive motor; a second main drive shaft extending from the drive motor to the opposite side of the first main drive shaft and transmitting the driving force of the drive motor to the auxiliary fluid pump of the eco-friendly special-purpose vehicle; a wheel drive shaft connected to a wheel of the eco-friendly special-purpose vehicle; a gear assembly provided between the first main drive shaft and the wheel drive shaft and transmitting the driving force of the drive motor to the wheel drive shaft at a preset gear ratio; a reducer or transmission including a reverse gear; a power take-off device provided in the reducer or the transmission and selectively connected to the gear assembly to extract the driving force of the drive motor separately from the wheel drive shaft; and a clutch device provided in the first main drive shaft and selectively blocking or connecting the driving force of the drive motor transmitted to the gear assembly.

At this time, the present invention may further include a motor sensing unit that measures the rotation speed per minute (rpm) of the driving motor and generates a rotation speed measurement value.

In addition, the present invention may further include a vehicle controller that receives a rotation speed measurement value of the motor sensing unit and generates a clutch control command when it is determined that the rotation speed per minute of the driving motor has decreased from exceeding a preset first reference rotation speed to below the first reference rotation speed.

In addition, the present invention may further include a clutch controller that receives a clutch control command from the vehicle controller and controls the clutch device to block the driving force of the driving motor transmitted to the gear assembly.

In such a case, if the vehicle controller determines that the rotation speed of the driving motor has decreased from exceeding the preset first reference rotation speed to below the first reference rotation speed, the vehicle controller may generate a motor control command together with the clutch control command.

The present invention may further include a motor controller that receives a motor control command from the vehicle controller and controls the rotation speed per minute of the driving motor to a preset second reference rotation speed.

At this time, the second reference rotation speed can be set to be smaller than the first reference rotation speed.

The drive system of an eco-friendly special-purpose vehicle capable of constant operation of the auxiliary pump of the present invention for solving the above-mentioned problem includes a power take-off device that directly takes out the driving power of the drive motor separately from the wheel drive shaft by selectively connecting to a gear assembly equipped in a reducer or transmission connected to a first main drive shaft extending to one side of the drive motor, and thus has the advantage of maximizing space efficiency within the vehicle.

In addition, the present invention has the advantage of being able to drive the auxiliary pump without adding a separate motor through a second main drive shaft extended to the other side of the drive motor, and maintaining the driving state of the auxiliary pump necessary for vehicle operation by separating the drive motor and the reducer or transmission through a clutch device even when braking.

That is, the present invention can configure the entire low-voltage driving system more simply by omitting an additional power system through a power take-off device that directly extracts the driving power of the driving motor, thereby reducing the manufacturing cost and supply cost.

The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

FIG. 1 is a drawing schematically showing the structure of a drive system of an eco-friendly special vehicle according to a first embodiment of the present invention;
FIG. 2 is a drawing showing a state in which a wheel and a special-purpose pump are driven simultaneously through a driving system of an eco-friendly special-purpose vehicle according to a first embodiment of the present invention;
FIG. 3 is a drawing showing a view of driving a bogie pump alone through a driving system of an eco-friendly special vehicle according to a first embodiment of the present invention;
FIG. 4 is a drawing schematically showing a control mechanism of a drive system of an eco-friendly special vehicle according to a first embodiment of the present invention;
FIG. 5 is a drawing showing a state in which a special purpose pump and an auxiliary pump are driven simultaneously through a driving system of an eco-friendly special purpose vehicle according to a second embodiment of the present invention; and
Figure 6 is a drawing schematically showing the structure of a drive system of an eco-friendly special vehicle according to a third embodiment of the present invention.

In this specification, when a component (or region, layer, portion, etc.) is referred to as being "on," "connected to," or "coupled to" another component, it means that it can be directly disposed/connected/coupled to the other component, or that a third component may be disposed between them.

Identical drawing symbols refer to identical components. Also, in the drawings, the thicknesses, proportions, and dimensions of components are exaggerated for the purpose of effectively explaining the technical contents.

“And/or” includes any combination of one or more of the associated constructs that can be defined.

The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are only used to distinguish one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as the second component, and similarly, the second component may also be referred to as the first component. The singular expression includes the plural expression unless the context clearly indicates otherwise.

Additionally, terms such as "below," "lower," "above," and "upper," are used to describe the relationships between components depicted in the drawings. These terms are relative concepts and are described based on the directions depicted in the drawings.

Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In addition, terms that are defined in commonly used dictionaries, such as terms, should be interpreted as having a meaning consistent with the meaning in the context of the relevant art, and are explicitly defined herein, unless they are interpreted in an idealized or overly formal sense.

It should be understood that the terms "include" or "have" are intended to specify the presence of a feature, number, step, operation, component, part, or combination thereof described in the specification, but do not exclude in advance the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a drawing schematically showing the structure of a drive system of an eco-friendly special vehicle according to a first embodiment of the present invention.

As illustrated in FIG. 1, the drive system of an eco-friendly special-purpose vehicle according to the first embodiment of the present invention includes a drive motor (100), a first main drive shaft (110), a second main drive shaft (120), a wheel drive shaft (11), a reducer (200), a power take-off device (300), and a clutch device (400).

The drive motor (100) is a component installed in an eco-friendly special vehicle to generate driving force.

And the first main drive shaft (110) is provided to extend to one side of the drive motor (100) and rotate by the driving force of the drive motor (100), and the driving force of the drive motor (100) is connected to the first main drive shaft (110) and transmitted to the wheel drive shaft (11) connected to the wheel (10) of the eco-friendly special vehicle.

In addition, the second main drive shaft (120) is provided to extend from the drive motor (100) to the opposite side of the first main drive shaft (110) and rotate by the driving force of the drive motor (100), and serves to transmit the driving force of the drive motor (100) to the auxiliary pump (30) of the eco-friendly special vehicle.

The view pump (30) is provided for the operation of additional operating equipment equipped in an eco-friendly special vehicle along with special equipment, and may be, for example, a steering pump, an air compressor, an air conditioner compressor, etc.

That is, in the case of this embodiment, the driving of an eco-friendly special vehicle and the auxiliary pump (30) including special equipment can be operated simultaneously with only a single drive motor (100).

In addition, in this embodiment, a reducer (200) is provided between the first main drive shaft (110) and the wheel drive shaft (11). At this time, the reducer (200) includes a gear assembly (210) that transmits the driving force of the drive motor (100) to the wheel drive shaft (11) at a preset gear ratio.

Since the basic driving principle of such a reducer (200) is obvious to those skilled in the art, a detailed description of the driving method will be omitted.

In addition, it is obvious that a transmission may be applied in place of the reducer (200), and in this embodiment, only the reducer (200) is provided as an example. In this case, the reducer (200) or the transmission may be collectively referred to as a gear ratio conversion unit that converts the gear ratio.

And in the case of the present embodiment, a power take-off device (300) is included that is equipped in the reducer (200) and selectively connected to the gear assembly (210) to extract the driving power of the driving motor (100) separately from the wheel drive shaft (11).

In particular, in this embodiment, the power take-off device (300) is connected to a special purpose drive shaft (21) provided in a special purpose pump (20) for operating special purpose equipment of an eco-friendly special purpose vehicle, and performs the role of transmitting the driving power of the drive motor (100) to the special purpose drive shaft (21) while connected to the gear assembly (210).

To this end, the power take-off device (300) may include an idle gear (310) that is formed to be linearly movable within the reducer (200) and is selectively engaged with the gear assembly (210).

A clutch device (400) is provided on the first main drive shaft (110) to selectively block or connect the driving power of the drive motor (100) transmitted to the gear assembly (210).

Specifically, in this embodiment, the first main drive shaft (110) has a state in which a predetermined point is divided, and the clutch device (400) is provided at the divided point of the first main drive shaft (110). In addition, the clutch device (400) may include a pair of clutch gears provided so as to be selectively engaged or separated between a pair of divided first main drive shafts (110).

The drive system of the eco-friendly special vehicle of this embodiment having the above configuration is operated in the following manner.

In the case of Fig. 1, the wheel (10) and the bogie pump (30) are driven together through the drive system of the eco-friendly special vehicle according to the first embodiment of the present invention, and the special pump is not operated.

As illustrated in FIG. 1, the eco-friendly special vehicle is equipped with a pair of clutch gears of a clutch device (400) that are meshed with each other in driving mode, and the driving force generated from the driving motor (100) is transmitted to the first main driving shaft (110) - the gear assembly (210) of the reducer (200) - the wheel driving shaft (11) - the wheel (10), thereby causing the wheel (10) to rotate and drive to be achieved.

In addition, the driving power of the driving motor (100) is transmitted to the second main driving shaft (120) so that the auxiliary pump (30) is driven.

And when the idle gear (310) of the power take-off device (300) is moved outward so as not to engage with the gear assembly (210) of the reducer (200), the special pump (20) is not driven.

Figure 2 shows a state in which a wheel (10), a special-purpose pump (20), and an auxiliary pump (30) are driven simultaneously through a driving system of an eco-friendly special-purpose vehicle according to the first embodiment of the present invention.

As illustrated in FIG. 2, the eco-friendly special-purpose vehicle is equipped with a pair of clutch gears (400) that are meshed with each other in the driving/special-purpose simultaneous operation mode, and the driving force generated from the driving motor (100) is transmitted to the first main driving shaft (110) - the gear assembly (210) of the reduction gear (200) - the wheel driving shaft (11) - the wheel (10), thereby causing the wheel (10) to rotate and drive to be achieved.

In addition, the driving power of the driving motor (100) is transmitted to the second main driving shaft (120) so that the auxiliary pump (30) is driven.

And the idle gear (310) of the power take-off device (300) has a state in which it has moved inward to be engaged with the gear assembly (210) of the reducer (200), and accordingly, the driving force generated from the driving motor (100) is transmitted to the first main drive shaft (110) - the gear assembly (210) of the reducer (200) - the idle gear (310) - the special drive shaft (21) - the special pump (20), so that the operation of the special equipment can be performed simultaneously.

Figure 3 shows a state in which the bogie pump (30) is driven solely by the drive system of an eco-friendly special vehicle according to the first embodiment of the present invention.

As shown in Fig. 3, the eco-friendly special vehicle is equipped with a pair of clutch gears of the clutch device (400) separated from each other in the braking mode, and thus the driving force generated from the driving motor (100) is blocked from being transmitted to the gear assembly (210) of the reducer (200).

However, even in this state, the driving power of the driving motor (100) is still transmitted to the second main driving shaft (120), so the driving of the bogie pump (30) can be maintained.

As described above, the present embodiment has the advantage of being able to maintain the driving state of the auxiliary pump (30) necessary for vehicle operation by separating the drive motor (100) and the reducer (200) through the clutch device (400) even when the eco-friendly special vehicle is braking and the power transmitted to the assembly (210) is cut off.

Meanwhile, FIG. 4 is a drawing schematically showing a control mechanism of a drive system of an eco-friendly special vehicle according to the first embodiment of the present invention.

As illustrated in FIG. 4, the drive system of the eco-friendly special vehicle according to the first embodiment of the present invention may include a control system including a motor sensing unit (510), a vehicle controller (500), a clutch controller (520), and a motor controller (530).

Among these, the motor sensing unit (510) is a component that measures the rotational speed per minute (rpm) of the driving motor (100) and generates a rotational speed measurement value.

And the vehicle controller (500) receives the rotation speed measurement value of the motor sensing unit (510) and generates a control command according to the rotation speed measurement value.

Specifically, when the vehicle controller (500) determines that the rotation speed of the drive motor (100) has decreased from exceeding a preset first reference rotation speed to below the first reference rotation speed, the vehicle controller (500) may generate a clutch control command by considering that the eco-friendly special vehicle has switched from driving mode to braking mode.

The clutch controller (520) receives the clutch control command of the vehicle controller (500) and controls the clutch device (400) to block the driving power of the driving motor transmitted to the gear assembly.

In addition, if the vehicle controller (500) determines that the rotation speed of the driving motor has decreased from exceeding the preset first reference rotation speed to below the first reference rotation speed, it can generate a motor control command together with a clutch control command.

The motor controller (530) receives the motor control command of the vehicle controller (500) and controls the rotation speed per minute of the drive motor (100) to a preset second reference rotation speed. This is to maintain the minimum rotation speed per minute for driving the auxiliary pump (30), and the second reference rotation speed can be set to be smaller than the first reference rotation speed.

And communication between each control system can be accomplished through CAN communication, etc.

Below, other embodiments of the present invention will be described. In this case, in each embodiment to be described below, redundant descriptions of components that are provided in the same manner as in the first embodiment described above will be omitted.

FIG. 5 is a drawing showing a special purpose pump (20) and an auxiliary pump (30) being driven simultaneously through a driving system of an eco-friendly special purpose vehicle according to a second embodiment of the present invention.

As shown in Fig. 5, this embodiment has the characteristic that a power blocking unit (12) is separately provided on the wheel drive shaft (11).

The power blocking unit (12) is provided to selectively block the driving power transmitted through the driving motor (100) - the first main driving shaft (110) - the gear assembly (210) from being transmitted to the wheel (10).

In particular, a power blocking unit (12) may be provided for each wheel drive shaft (11) individually connected to a plurality of wheels (10), thereby enabling each wheel (10) to be operated independently by blocking the driving power transmitted to some of the wheels (10) among the plurality of wheels (10), or by blocking the driving power transmitted to all wheels (10), allowing only the special-purpose pump (20) and the auxiliary pump (30) to be operated independently when the eco-friendly special-purpose vehicle is not in operation.

Specifically, in this embodiment, the wheel drive shaft (11) has a state in which a predetermined point is divided, and the power blocking unit (12) is provided at the divided point of the wheel drive shaft (11). In addition, the power blocking unit (12) may include a pair of clutch gears provided between a pair of divided wheel drive shafts (11).

A pair of clutch gears like this have a way of selectively meshing with each other by forming one of them to be linearly movable, thereby controlling whether to transmit driving power to the wheel (10) side or to block the driving power.

Figure 6 is a drawing schematically showing the structure of a drive system of an eco-friendly special vehicle according to a third embodiment of the present invention.

The third embodiment of the present invention illustrated in FIG. 6 has the characteristic that an auxiliary reduction gear (410) is further provided between the driving motor (100) and the clutch device (400).

Such an auxiliary reducer (410) is formed so as to reduce the rotational speed of the first main drive shaft (100) connected to the drive motor (100) at a preset ratio, thereby allowing the rotational speed of one clutch gear of the clutch device (400) to be maintained lower than the actual rotational speed per minute of the drive motor (100).

The reason for doing this is that when the rotational speed per minute becomes excessively high depending on the situation while the driving motor (100) is driving the bogie pump (30) alone, a sudden shock may occur in the driving system when a pair of clutch gears of the clutch device (400) are engaged with each other.

Accordingly, in this embodiment, when the rotation speed per minute exceeds a preset third reference rotation speed during the process in which the drive motor (100) drives the bogie pump (30) alone, the auxiliary reducer (400) is operated so that the rotation speed of one clutch gear of the clutch device (400) can be reduced to be smaller than the actual rotation speed per minute of the drive motor (100), and as a result, the shock during the process of meshing a pair of clutch gears of the clutch device (400) with each other can be minimized.

As described above, preferred embodiments according to the present invention have been examined, and it is obvious to those skilled in the art that the present invention can be embodied in other specific forms in addition to the embodiments described above without departing from the spirit or scope thereof. Therefore, the above-described embodiments should be considered as illustrative rather than restrictive, and accordingly, the present invention is not limited to the above description, but may be modified within the scope of the appended claims and their equivalents.

10: Wheel
11: Wheel drive shaft
20: Special purpose pump
21: Special purpose drive shaft
30: Viewing pump
100: Drive motor
110: 1st main drive shaft
120: Second main drive shaft
200: Reducer
210: Gear Assembly
300: Power take-off unit
310: Airborne gear
400: Clutch device
410: Auxiliary reducer
500: Vehicle Controller
520: Clutch controller
530: Motor controller

Claims (7)

A drive motor that is installed in an eco-friendly special vehicle and generates driving force;
A first main drive shaft extending to one side of the above drive motor;
A second main drive shaft extending from the drive motor to the opposite side of the first main drive shaft and transmitting the driving power of the drive motor to the auxiliary pump of the eco-friendly special vehicle;
Wheel drive axle connected to the wheel of an eco-friendly special vehicle;
A gear assembly provided between the first main drive shaft and the wheel drive shaft, which transmits the driving force of the drive motor to the wheel drive shaft at a preset gear ratio, and a reduction gear or transmission including a reverse gear;
A power take-off device provided in the above reducer or the above transmission and selectively connected to the gear assembly to extract driving power of the driving motor separately from the wheel drive shaft;
A clutch device provided on the first main drive shaft and selectively blocks or connects the driving power of the drive motor transmitted to the gear assembly;
A motor sensing unit that measures the rotation speed per minute (rpm) of the above driving motor and generates a rotation speed measurement value; and
A vehicle controller that receives a rotation speed measurement value of the motor sensing unit and generates a clutch control command when it is determined that the rotation speed per minute of the driving motor has decreased from exceeding a preset first reference rotation speed to below the first reference rotation speed;
Including,
Drive system for eco-friendly special vehicles. delete delete In the first paragraph,
Further comprising a clutch controller that receives a clutch control command from the vehicle controller and controls the clutch device to block the driving power of the driving motor transmitted to the gear assembly.
Drive system for eco-friendly special vehicles. In the first paragraph,
The above vehicle controller generates a motor control command together with the clutch control command when it is determined that the rotation speed of the driving motor has decreased from exceeding the preset first reference rotation speed to below the first reference rotation speed.
Drive system for eco-friendly special vehicles. In paragraph 5,
Further comprising a motor controller that receives a motor control command from the vehicle controller and controls the rotation speed per minute of the driving motor to a preset second reference rotation speed.
Drive system for eco-friendly special vehicles. In Article 6,
The above second reference rotation speed is set to be smaller than the above first reference rotation speed.
Drive system for eco-friendly special vehicles.