Combined type power mechanism for engineering machinery and engineering machinery provided with combined type power mechanism

Abstract

The invention provides a combined type power mechanism for engineering machinery. The combined type power mechanism comprises an engine used for driving a walking assembly and a pumping assembly of the engineering machine; the engine is connected to an input port of the power transmission unit, and the pumping assembly and the walking assembly are independently connected to a first output port and a second output port of the power transmission unit correspondingly; and the electric motor is configured to be connected to the first output port of the power transmission unit in series with the pumping assembly so as to replace the engine to drive the pumping assembly, and when the engine is used for driving the pumping assembly, the electric motor is dragged by the engine through the power transmission unit to be in an idle state. By means of the combined type power mechanism, an existing indexing box can be used, and the complexity of the mechanism and the construction cost of the mechanism cannot be increased too much. The invention further provides an engineering machine provided with the combined type power mechanism.

Description

Technical Field

[0001] The invention relates to a power mechanism, in particular to a composite power mechanism, and also to an engineering machine such as a vehicle-mounted concrete pump truck provided with the mechanism. Background Art

[0002] In existing construction machinery (e.g., a vehicle-mounted concrete pump truck), an engine is generally used as a power source, which is connected to a pumping assembly and a travel assembly of the vehicle respectively through a power transmission unit (e.g., a dividing box provided with two clutches). When the vehicle is intended to be displaced, the engine transmits power to the travel assembly via the dividing box so that the vehicle is moved into position under the drive of the travel assembly. Subsequently, after the vehicle is in position, the engine transmits power to the pumping assembly via the dividing box so that a pumping operation (e.g., concrete is pumped to a desired position) is performed through the pumping assembly.

[0003] This type of vehicle-mounted concrete pump truck has the following problems:

[0004] In cities with high requirements for CO2 emission limits (such as requiring zero CO2 emissions), using an engine to drive a pumping assembly obviously does not meet the corresponding requirements, thus limiting the use of such vehicle-mounted concrete pump trucks in relevant areas.

[0005] However, it is not realistic to use full electric motor (EM) drive because the required battery capacity is large and cannot meet the minimum travel requirement of the vehicle-mounted concrete pump truck, which limits its flexibility and universality.

[0006] To this end, a composite power mechanism combining engine drive and EM drive is proposed. This composite power mechanism solves the above problems well, but it inevitably has other problems. For example, the composite power mechanism cannot use the existing indexing box, which requires additional design and mold opening of the indexing box to add another set of clutches in the indexing box. Therefore, this design will inevitably increase the complexity of the mechanism and the cost of mechanism construction. In addition, the additional mechanical clutch will also reduce the transmission efficiency of the mechanism due to the increase in the number of parts.

[0007] Therefore, it is necessary to provide a new type of composite power mechanism that can be applied to the existing dividing box without excessively increasing the complexity of the mechanism and the cost of building the mechanism, and without the risk of reducing the mechanical transmission efficiency by adding mechanical components to the dividing box. Summary of the invention

[0008] In order to achieve one or more of the above objectives, the present invention provides a composite power mechanism for engineering machinery.

[0009] The composite power mechanism includes: an engine, which is used to drive a traveling component and a pumping component of the engineering machinery; a power transmission unit, which has an input port, a first output port and a second output port, a first transmission path with a first transmission ratio between the input port and the first output port, and a second transmission path with a second transmission ratio between the input port and the second output port, the engine is connected to the input port of the power transmission unit, the pumping component and the traveling component are independently connected to the first output port and the second output port of the power transmission unit, respectively, relative to each other, to achieve power transmission between the engine and the pumping component and between the engine and the traveling component; and an electric motor, which is configured to be connected to the first output port of the power transmission unit in series with the pumping component to drive the pumping component instead of the engine. Wherein, when the engine is used to drive the pumping component, the electric motor is dragged by the engine through the power transmission unit and is in an idling state.

[0010] Furthermore, the power transmission unit is provided with a first clutch located in the first transmission path and a second clutch located in the second transmission path.

[0011] According to one embodiment of the present invention, the electric motor is connected between the first output port and the pumping assembly.

[0012] Further, the electric motor is provided with a motor shaft on a first side of the electric motor and a motor shaft hole on a second side opposite to the first side, the motor shaft is connected to the first output port, and the input shaft of the pumping assembly is inserted into the motor shaft hole and connected to each other in a spline connection manner.

[0013] Furthermore, the pumping assembly includes at least two pumps connected in series, and the input shaft of the pumping assembly is a pump shaft of one of the at least two pumps disposed adjacent to the electric motor.

[0014] According to another embodiment of the present invention, the pumping assembly includes at least two pumps connected in series with each other, and the electric motor is disposed between any two adjacent selected pumps of the at least two pumps.

[0015] Further, the electric motor is provided with a motor shaft on a first side of the electric motor and a motor shaft hole on a second side opposite to the first side, the motor shaft is configured to be inserted into a pump shaft hole of one of the two selected pumps connected thereto, and the motor shaft hole is configured to receive a pump shaft of the other of the two selected pumps to achieve power transmission between the two selected pumps and the electric motor.

[0016] Furthermore, the motor shaft is configured to be inserted into a pump shaft hole of a first pump among the at least two pumps, wherein the pump shaft of the first pump is connected to an output shaft of the power transmission unit.

[0017] In addition, the at least two pumps are a combination of one or more of a closed pump, an open pump, a fixed displacement pump, and a variable displacement pump. The engineering machinery is a vehicle-mounted concrete pump truck.

[0018] The present invention also provides an engineering machinery, which is provided with: any one of the aforementioned compound power mechanisms; the aforementioned pumping assembly, which receives power from the compound power mechanism for pumping operations; and the aforementioned walking assembly, which receives power from the compound power mechanism to shift the engineering machinery.

[0019] By utilizing the composite power mechanism of the present invention, the existing indexing box can be used without excessively increasing the complexity of the mechanism and the cost of the mechanism construction, and the mechanical transmission efficiency will not be reduced due to the addition of mechanical parts in the indexing box. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the composition of the existing power mechanism.

[0021] Figure 2 It is a schematic diagram of the composition of an existing composite power mechanism.

[0022] Figure 3 It is a schematic diagram of the structure of a composite power mechanism according to an embodiment of the present invention.

[0023] Figure 4 and Figure 5 They are respectively a top view and a side view of the structure of a pump used in the compound power mechanism according to the present invention.

[0024] Figure 6 1 is a simplified structural diagram of an electric motor used in a compound power mechanism according to the present invention, wherein a motor shaft and a motor shaft hole thereof are shown in a cross-sectional view.

[0025] Figure 7 and 8 Schematic diagrams of the structure of a compound power mechanism according to two alternative embodiments of the present invention. DETAILED DESCRIPTION

[0026] The structure of the power mechanism is described in detail below in conjunction with the accompanying drawings. In the accompanying drawings, the same components are referred to by the same or similar reference numerals.

[0027] Figure 1 A schematic diagram of the structure of an existing power mechanism is shown.

[0028] The existing power mechanism 100 comprises a (fuel) engine 1 and a power transmission unit in the form of a graduated box 2. The graduated box 2 is provided with an input port, a first output port, and a second output port. The engine 1 is connected to the input port of the graduated box 2 via an output shaft 1s. The pumping assembly P and the traveling assembly T provided in the vehicle concrete pump truck are respectively connected to the first output port and the second output port of the graduated box 2 to receive power from the engine 1.

[0029] In the indexing box 2, two transmission paths are provided.

[0030] There is a first transmission path with a first transmission ratio between the input port and the first output port. The clutch 21 is disposed in the first transmission path and is configured to transmit power from the engine 1 to the pumping assembly P. The first transmission ratio can be established by a speed changing element such as a gear disposed in the first transmission path.

[0031] There is a second transmission path having a second transmission ratio different from the first transmission ratio between the input port and the second output port. The clutch 22 is disposed in the second transmission path and is configured to transmit power from the engine 1 to the travel assembly T. The second transmission ratio may be 1, for example, the input port is connected to the input end (side) of the clutch 22 via a shaft, and the output end (side) of the clutch 22 is connected to the second output port via a shaft. Alternatively, a speed-changing element such as a gear may be included in the second transmission path to establish a second transmission ratio having a desired value.

[0032] The arrows in the figure show the direction of power transmission. Therefore, by changing the engagement / disengagement state of the clutches 21 and 22 in the indexing box 2 (i.e., by selecting the first transmission path or the second transmission path), it is determined whether to transmit power to the pumping assembly P to perform the pumping operation of pumping concrete, or to transmit power to the traveling assembly T to drive the displacement of the vehicle-mounted concrete pump truck.

[0033] As mentioned above, the main disadvantage of the existing power mechanism 100 is that it cannot achieve zero emission of CO 2 during the driving of the pumping assembly P. Therefore, it cannot be used in sites with strict requirements on CO 2 emissions.

[0034] Figure 2 FIG. 1 is a schematic diagram showing the structure of an existing composite power mechanism. Figure 1 The difference of the power mechanism 1 shown is that the compound power mechanism 100-1 also includes an electric motor assembly E. The electric motor assembly E includes an electric motor (hereinafter referred to as "motor") E1, a control unit E2 and a power source E3. The power source E3 supplies power to the motor E1 and the control unit E2, and the control unit E2 is used to control the operation of the motor E1.

[0035] Figure 2 The indexing box 2-1 used in the composite power mechanism 100-1 shown is different from Figure 1 The indexing box 2 shown in the figure is different in that, in addition to the clutch 21 and the clutch 22 provided in the indexing box 2-1, a clutch 23 is also provided. The electric motor assembly E is also connected to the input port of the indexing box 2-1 to be connected to the clutch 23, so that when providing power to the pumping assembly P, switching between electric drive (powered by the electric motor assembly E) and fuel drive (powered by the engine 1) can be achieved.

[0036] When operating in an area requiring zero CO2 emissions, the electric motor assembly E can be used to provide power to the pumping assembly P by engaging the clutch 23 and disengaging the clutch 21. This design can well meet regional environmental protection requirements, but the composite power mechanism 100-1 requires additional mechanical components (i.e., the clutch 23 and its related connection structure) to be added to the indexing box 2-1 due to the addition of an electrically driven mechanism (i.e., the electric motor assembly E), which inevitably reduces the mechanical transmission efficiency of the indexing box 2-1 and increases the complexity of the mechanism and the probability of mechanical failure. In addition, the design of the composite power mechanism 100-1 cannot use the existing indexing box design, so it has to be redesigned and molded to manufacture a new indexing box 2-1 that meets its requirements, which inevitably increases the cost of the mechanism construction.

[0037] Figure 3 FIG. 200 shows a composite power mechanism according to an embodiment of the present invention. Figure 2 The difference between the conventional compound power mechanism 100-1 shown in FIG. 20 is that the indexing box used in the compound power mechanism 200 is different from the indexing box used in the compound power mechanism 200. Figure 1 The structure of the indexing box 2 used in the power mechanism 100 is the same as that of the indexing box 2, and the electric motor assembly 3 is arranged at the output port of the indexing box 2. The electric motor assembly 3 includes an electric motor (hereinafter referred to as "motor") 31, a control unit 32 and a power supply 33. The power supply 33 supplies power to the motor 31 and the control unit 32, and the control unit 32 is used to control the operation of the motor 31. The structures of the components in the electric motor assembly 3 can be the same as those in the Figure 2 The structures of the components in the electric motor assembly E shown in the figure are the same, but may also be different.

[0038] In addition to the electric motor assembly 3, Figure 3 The pumping assembly P connected to the power mechanism shown in FIG. Figure 1 and Figure 2 The pumping assembly P shown in FIG. 1 has substantially the same structure. At least two pumps are usually provided in the pumping assembly P. Figure 1-3Five pumps are shown, but those skilled in the art can change the specific number of pumps provided in the pumping assembly P according to actual needs. These pumps can be a combination of one or more of a closed pump, an open pump, a fixed capacity pump and a variable capacity pump.

[0039] At least two pumps in the pumping assembly P are arranged in series to obtain a higher head. Figure 4 and Figure 5 , each of the at least two pumps in the pumping assembly P is provided with a pump shaft PS on one side and a pump shaft hole PH on the other opposite side. A spline (not shown) is provided on the outer periphery of the pump shaft PS, and a keyway for receiving the spline is provided on the hole wall of the pump shaft hole PH. In an alternative embodiment, as an option, the spline may be provided on the hole wall of the pump shaft hole PH, and the keyway may be provided on the pump shaft PS. By connecting these pumps (e.g., Figure 1-3 The pump shaft PS of the second pump P2 (shown as the first pump P1, the second pump P2, the third pump P3, the fourth pump P4 and the fifth pump P5) which are arranged in sequence and gradually away from the dividing box is inserted into the pump shaft hole PH of the first pump P1, so that the spline and the keyway cooperate, thereby realizing the series connection between the second pump P2 and the first pump P1, and then realizing the power transmission between the two. The connection of other pumps is carried out in the same way. In view of the fact that this connection relationship is well known to those skilled in the art, it will not be described here in detail. Those skilled in the art can conceive of using other applicable methods to realize power transmission between pumps, and the present invention does not limit this.

[0040] In the current embodiment of the present invention, the electric motor assembly 3 (specifically, the motor 31) is shown to be disposed between the second pump P2 and the third pump P3 of the pumping assembly P, as shown in FIG. Figure 3 Specifically, see Figure 6 , the motor 31 is provided with a motor shaft MS on one side and a motor shaft hole MH on the other side opposite thereto. Similarly, a spline / keyway is provided on the motor shaft MS, and a keyway / spline is provided on the hole wall of the motor shaft hole MH. During assembly, the motor shaft MS of the motor 31 is inserted into the pump shaft hole PH of the first pump P1, and the pump shaft PS of the second pump P2 is inserted into the motor shaft hole MH, so as to realize the power transmission from the motor 31 to the first pump P1 and the second pump P2 through the spline / keyway connection. It should be noted that this connection only changes the power transmission to the first pump P1 and the second pump P2, but does not affect the fluid communication between the first pump P1 and the second pump P2, and therefore, will not have any effect on the final head of the series pumps.

[0041] Thus, when the shifting operation of the vehicle is performed, the clutch 21 in the indexing box 2 is in a disengaged state, and the clutch 22 is kept in an engaged state, so that the power generated by the engine 1 is transmitted to the traveling assembly T. Once the vehicle is in position, the clutch 22 can be in a disengaged state, and the clutch 21 can be in an engaged state to provide power to the pumping assembly P. At this time, the motor 31 can be in a power-off state, and when the pumping assembly P is driven by the engine 1, the motor 31 is in an idling state to achieve power transmission between two pumps adjacent to the motor.

[0042] At a position where zero CO2 emissions are required, the clutch 21 can be placed in a disengaged state, and power can be supplied to the motor 31 and the control unit 32 via the power supply 33 so that the motor 31 can be controlled to operate via the control unit 32, thereby providing power to each pump in the pumping assembly P connected to the motor 31 (i.e., the directly connected first pump P1 and the second pump P2 and the indirectly connected third pump P3, fourth pump P4 and fifth pump P5), thereby allowing pumping operations.

[0043] It should be mentioned that during the pumping operation, the displacement of the vehicle is not affected. In other words, while the pumping operation is being performed, the clutch 22 can be engaged to drive the vehicle to perform the required displacement operation.

[0044] although Figure 3 The motor 31 is shown as being disposed between the first pump P1 and the second pump P2. In fact, the motor 31 may be disposed between any two adjacent pumps in the pumping assembly P, for example, between the pumps P1 and P2 (eg, Figure 7 ), between pumps P3 and P4, and between pumps P4 and P5. However, in terms of drivability, it is preferred that the motor 31 be disposed after the first pump P1 closest to the indexing box 2.

[0045] As an alternative, the motor 31 may also be arranged before the first pump P1, such as Figure 8 In this case, the motor shaft MS of the motor 31 is connected to the output shaft of the clutch 21 through a coupling, and at the same time, the motor shaft hole MH of the motor 31 receives the pump shaft PS of the first pump P1 in a spline / keyway engagement manner.

[0046] In such Figure 8 In the case shown, it should be noted that when the motor 31 is used to drive the pumping assembly P, it is necessary to ensure that the clutch 21 is in a disengaged state. At this time, unlike the above two connection situations, the motor 31 only outputs power on one side, not on both sides.

[0047] It should be further explained that, although the present invention is described in conjunction with a vehicle-mounted concrete pump truck, the present invention is not intended to be limited to such a vehicle, and where applicable, the composite power mechanism of the present invention can be used in any engineering machinery to achieve transmission.

[0048] Although several embodiments of the present invention have been described with reference to the accompanying drawings, as will be appreciated by those skilled in the art, various modifications may be made to the above embodiments without departing from the scope defined by the appended claims. The above embodiments are provided only as examples to illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention. Features or elements described in one embodiment may be incorporated into another embodiment for implementation unless they conflict with existing features or elements in another embodiment.

Claims

1. A composite power mechanism for engineering machinery, comprising: An engine, the engine being used to drive a traveling component and a pumping component of the engineering machinery; A power transmission unit, the power transmission unit having an input port, a first output port, and a second output port, a first transmission path having a first transmission ratio exists between the input port and the first output port, and a second transmission path having a second transmission ratio exists between the input port and the second output port, the engine is connected to the input port of the power transmission unit, and the pumping assembly and the travel assembly are independently connected to the first output port and the second output port of the power transmission unit, respectively, relative to each other, so as to realize power transmission between the engine and the pumping assembly and between the engine and the travel assembly; as well as an electric motor configured to be connected in series with the pumping assembly to the first output port of the power transmission unit to drive the pumping assembly instead of the engine, When the engine is used to drive the pumping assembly, the electric motor is dragged by the engine via the power transmission unit and is in an idling state.

2. The compound power mechanism according to claim 1, characterized in that: The power transmission unit is provided with a first clutch located in the first transmission path and a second clutch located in the second transmission path.

3. The compound power mechanism according to claim 2, characterized in that: The electric motor is connected between the first output port and the pumping assembly.

4. The compound power mechanism according to claim 3, characterized in that: The electric motor is provided with a motor shaft on a first side of the electric motor and a motor shaft hole on a second side opposite to the first side, the motor shaft is connected to the first output port, and the input shaft of the pumping assembly is inserted into the motor shaft hole and connected to each other in a spline connection manner.

5. The compound power mechanism according to claim 4, characterized in that: The pumping assembly includes at least two pumps connected in series with each other, and an input shaft of the pumping assembly is a pump shaft of one of the at least two pumps disposed adjacent to the electric motor.

6. The compound power mechanism according to claim 2, characterized in that: The pumping assembly includes at least two pumps connected in series with each other, and the electric motor is disposed between any two adjacent selected pumps of the at least two pumps.

7. The compound power mechanism according to claim 6, characterized in that: The electric motor is provided with a motor shaft on a first side of the electric motor and a motor shaft hole on a second side opposite to the first side, the motor shaft is configured to be inserted into a pump shaft hole of one of the two selected pumps connected thereto, and the motor shaft hole is configured to receive a pump shaft of the other of the two selected pumps to achieve power transmission between the two selected pumps and the electric motor.

8. The compound power mechanism according to claim 7, characterized in that: The motor shaft is configured to be inserted into a pump shaft hole of a first pump among the at least two pumps, wherein the pump shaft of the first pump is connected to an output shaft of the power transmission unit.

9. The compound power mechanism according to any one of claims 6 to 8, characterized in that: The at least two pumps are a combination of one or more of a closed pump, an open pump, a fixed displacement pump, and a variable displacement pump.

10. The compound power mechanism according to any one of claims 1 to 8, characterized in that: The engineering machinery is a vehicle-mounted concrete pump truck.

11. An engineering machine, characterized in that: The engineering machinery is provided with: A compound power mechanism as claimed in any one of the preceding claims; the pumping assembly receiving power from the compound power mechanism for performing a pumping operation; and The traveling assembly receives power from the compound power mechanism to displace the engineering machine.

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