Power system for construction machine

Abstract

A power system for engineering machinery comprises a motor, a gearbox and an operating element, power of the motor is transmitted to the gearbox through a rotating shaft, and the gearbox drives the operating element. The power system further comprises an access assembly used for being connected with an external power source, the access assembly is arranged between the motor and the gearbox around the rotating shaft, and the access assembly comprises a driving element suitable for being coupled with the external power source and a driven element which is coupled with the driving element and driven by the driving element. The driven element is configured to drive the rotating shaft. And a more flexible power system layout can be provided.

Description

Technical Field

[0001] The present application relates to a power system for construction machinery such as a concrete tank truck. Background Art

[0002] In construction machinery, its power system often uses a motor to drive the working elements through a gearbox. For example, in a concrete tank truck, a motor is used to drive the concrete tank through a gearbox. For such a power system, it is sometimes necessary to set a power interface for connecting an external power source to drive the working elements in situations such as when the motor cannot work. For example, in a concrete tank truck, if the motor cannot work and the concrete tank stops working, residual concrete will solidify inside and cause economic losses, so an external power source is needed to drive the concrete tank to complete the work.

[0003] For such a construction machinery power system, it is usually configured to connect the motor's rotor shaft to the gearbox at the front end, and to provide a power interface at the rear end. In this configuration, it is necessary to leave a sufficiently large space for the external power source at the rear side of the motor. However, leaving space at the rear side of the motor in the construction machinery will cause inconvenience to the layout of the power system, and it may be necessary to change the position of the entire power system in the construction machinery, or even to increase the longitudinal size of the entire construction machinery. In addition, since the motor inverter cannot be arranged at the rear side of the motor in order to access the external power source, this places restrictions on the layout of the power system. Utility Model Content

[0004] The present application aims to provide a power system for engineering machinery, which can provide a more flexible and diverse power system layout.

[0005] According to one aspect of the present application, a power system for engineering machinery is provided, comprising: a motor, a gearbox and a working element, wherein the power of the motor is transmitted to the gearbox via a rotating shaft, and the gearbox drives the working element; it is characterized in that the power system also includes an access component for accessing an external power source, the access component is arranged around the rotating shaft between the motor and the gearbox, the access component includes an active element suitable for coupling with the external power source and a driven element coupled to the active element and driven by the active element, the driven element is configured to drive the rotating shaft.

[0006] In one embodiment, the active element is provided with a power interface suitable for coupling with an external power source, the power interface is arranged above or on the lateral side of the rotating shaft, and the power interface points in the radial outward direction of the power system or in the forward or backward direction parallel to the axial direction.

[0007] In one embodiment, the power interface is provided with a structure suitable for matching with the end of the output shaft of the external power source.

[0008] In one embodiment, the access assembly has a housing, and the housing is fixed to at least one of the motor and the gearbox.

[0009] In one embodiment, the active element and the passive element are both arranged inside the housing; or, the passive element is arranged inside the housing, and the active element is arranged outside the housing.

[0010] In one embodiment, the driven element is fixed on the rotating shaft; or, the driven element is arranged around the rotating shaft via a sleeve shaft, and a clutch is provided between the sleeve shaft and the rotating shaft.

[0011] In one embodiment, the active element is a driving bevel gear, and the driven element is a driven bevel gear meshing with the active bevel gear; or, the active element is a worm, and the driven element is a worm wheel meshing with the worm; or, the active element is a driving pulley, and the driven element is a driven pulley, and the driving pulley and the driven pulley are coupled through a transmission belt; or, the active element is a driving sprocket, and the driven element is a driven sprocket, and the driving sprocket and the driven sprocket are coupled through a transmission chain.

[0012] In one embodiment, the transmission ratio between the driving element and the driven element is set based on at least the power of the external power source and the power of the motor.

[0013] In one embodiment, the motor is equipped with an inverter, and the inverter is arranged on the rear side, the upper side, or the lateral side of the motor.

[0014] In one embodiment, the engineering machine is a concrete tank truck, and the working element is a concrete tank.

[0015] According to the power system for engineering machinery of the present application, the power interface is arranged between the motor and the gearbox, so that the external power source can be connected from the upper side or the lateral side of the power system, and there is no need to leave space for the external power source at the rear side of the motor, thereby facilitating the layout of the power system. In addition, since there is no need to connect the external power source at the rear side of the motor, the inverter of the motor can be flexibly arranged at the rear side, upper side, or lateral side of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The foregoing and other aspects of the present application will be more fully understood through the following detailed description made with reference to the accompanying drawings, in which:

[0017] Figure 1 is a schematic diagram of a feasible implementation of the engineering machinery power system according to the present application;

[0018] Figure 2-Figure 4It is a schematic diagram of other feasible implementations of the engineering machinery power system according to the present application. DETAILED DESCRIPTION

[0019] The present application generally relates to a power system for construction machinery. Various exemplary embodiments of the power system for construction machinery are shown in the accompanying drawings. In these embodiments, the construction machinery involved is a concrete tanker, and the present application will be described below with reference to the accompanying drawings using the power system for the concrete tanker as an example, but the power system solution of the present application is also applicable to other suitable construction machinery.

[0020] See also Figure 1 The power system includes a motor 1 as a main power source. The motor 1 is equipped with an inverter 2 for converting direct current from a power battery of an engineering vehicle into alternating current to supply the motor 1 so as to drive a rotor 3 of the motor 1 to rotate.

[0021] The output end of the motor 1 is connected to the input end of the gearbox 5 through the rotating shaft 4. The rotating shaft 4 can be in the form of an extended section of the rotor shaft of the rotor 3, or made into a separate component and connected to the rotor shaft. The output end of the gearbox 5 is connected to the concrete tank 6 as the working element of the concrete tanker. Through the gearbox 5, the output rotational power of the motor 1 is reduced and transmitted to the concrete tank 6 to drive the concrete tank 6 to rotate.

[0022] Between the motor 1 and the gearbox 5, an access assembly 8 for an external power source 7 is arranged around the rotating shaft 4. The external power source 7 is used to be connected to the power system through the access assembly 8 when the motor 1 fails to work normally, so as to replace the motor 1 to drive the concrete tank 6 to continue to complete the work.

[0023] The external power source 7 may be an external electric motor, hydraulic motor, etc., and the rotational power of its output shaft 9 is transmitted to the rotating shaft 4 via the access component 8 .

[0024] The access assembly 8 may have its own housing, which may be arranged axially between the housing of the motor 1 and the housing of the gearbox 5 , and may be fixed to one or both of the housings of the motor 1 and the gearbox 5 .

[0025] The access assembly 8 includes a transmission element disposed in its housing. Figure 1In the example of , the transmission element includes a driving bevel gear (driving element) 10 suitable for connecting to the output shaft 9 and a driven bevel gear (driven element) 11 fixed to the rotating shaft 4. The driving bevel gear 10 is meshed with the driven bevel gear 11. The transmission ratio (speed ratio) between the driving bevel gear 10 and the driven bevel gear 11 can be set to be equal, or based on the power range of the applicable external power source 7 and the power of the motor 1. In addition, based on the cone angles of the driving bevel gear 10 and the driven bevel gear 11, the output shaft 9 can be perpendicular to the rotating shaft 4 or tilted at an angle relative to the rotating shaft 4.

[0026] The rotating shaft of the active bevel gear 10 is rotatably supported by the housing of the access component 8, and a power interface is provided at the end of the rotating shaft of the active bevel gear 10, to which the end of the output shaft 9 can be coupled. The power interface is open outwardly with its back to the rotating shaft 4. The power interface can usually be provided in the housing of the access component 8, but can also protrude out of the housing of the access component 8. When the external power source 7 is not enabled, the power interface can be closed relative to the outside world by a closing element such as an openable cover or door. When it is necessary to enable the external power source 7, the closing element can be opened to expose the power interface, and the end of the output shaft 9 can be coupled to the power interface, so that the power of the external power source 7 is transmitted to the rotating shaft 4 via the active bevel gear 10 and the driven bevel gear 11, and is transmitted from the rotating shaft 4 to the concrete tank 6 via the gearbox 5.

[0027] An exemplary structure of the power interface is a slot formed in the end of the rotating shaft of the active bevel gear 10, the size and shape of the slot are suitable for plug-in cooperation with the end of the output shaft 9, and the slot and the end of the output shaft 9 form a matching structure, such as matching planes or matching key-keyways, etc., so as to realize the transmission of the rotational motion of the output shaft 9 to the rotating shaft of the active bevel gear 10.

[0028] Another exemplary structure of the power interface is a flange on the end of the rotating shaft of the active bevel gear 10 , which is suitable for being connected to a corresponding flange provided on the end of the output shaft 9 by bolts.

[0029] Other forms of power interfaces can also be conceived by those skilled in the art.

[0030] A variety of power interfaces that can be selected on site may also be provided in the power system, and the user may select a suitable power interface form according to the available external power source 7 .

[0031] By arranging the active bevel gear 10 on the upper side of the rotating shaft 4, the power interface can be directed upward relative to the rotating shaft 4, so that the external power source 7 can be connected from approximately above. Alternatively, the active bevel gear 10 can also be arranged on the lateral side of the rotating shaft 4, so that the power interface is directed horizontally relative to the rotating shaft 4, so that the external power source 7 can be connected approximately horizontally.

[0032] Regardless of whether the power interface is set to point upward or horizontally relative to the rotating shaft 4, the power interface is located between the motor 1 and the gearbox 5 in the axial direction, which enables the external power source 7 to be connected from the top or lateral side of the power system. For the power system, the axial dimension it occupies is usually much larger than the dimension it occupies in the vertical direction and lateral direction. Therefore, when the external power source 7 is connected from the top or lateral side, it is not necessary to leave space for the external power source 7 on the rear side of the motor 1 as in the way of connecting the external power source 7 from the rear side of the motor 1, so it will not cause inconvenience to the layout of the power system. For example, in most concrete tank truck applications, the rear side of the motor 1 is usually close to the cab, so it is usually difficult to leave space for the external power source 7 on the rear side of the motor 1. The power system solution of the present application avoids this problem. In the power system of the present application, the external power source 7 is connected from the upper side or lateral side of the power system, and the upper side and lateral side of the power system usually have sufficient space for connecting the external power source 7. Therefore, the power system solution of the present application provides convenience for its layout.

[0033] In addition, for the method of connecting the external power source 7 from the rear side of the motor 1, the inverter 2 cannot be arranged at the rear side of the motor 1. Figure 1 As schematically shown in FIG. 1 , the inverter 2 can be arranged at the rear side of the motor 1; or, according to the specific application, the inverter 2 can also be arranged at the upper side of the motor 1 (such as Figure 1 ), or arranged on any lateral side of the motor 1. The power system solution of the present application provides greater convenience for the arrangement of the inverter 2.

[0034] The access component 8 in the power system of the present application can also be implemented in other forms. Figure 2-Figure 4 Some possible forms of access components 8 are shown.

[0035] See also Figure 2 The transmission element arranged in the housing of the access component 8 in the power system includes a worm (active element) 12 suitable for connecting to the output shaft 9 and a worm wheel (driven element) 13 fixed on the rotating shaft 4. The worm 12 is meshed with the worm wheel 13. The speed ratio between the worm 12 and the worm wheel 13 can be set based on the power range of the applicable external power source 7 and the power of the motor 1. The rotating shaft of the worm 12 is rotatably supported by the housing of the access component 8, and a power interface is arranged at one end of the rotating shaft of the worm 12, and the end of the output shaft 9 can be coupled to the power interface. The output shaft 9 is perpendicular to the rotating shaft 4. Figure 2 Other aspects of the power system in the previous reference Figure 1 The power systems described are the same or similar and will not be described again.

[0036] See also Figure 3The transmission element arranged in the housing of the access component 8 in the power system includes a driving pulley (driving element) 14 suitable for connecting to the output shaft 9 and a driven pulley (driven element) 15 fixed on the rotating shaft 4. The driving pulley 14 and the driven pulley 15 are coupled by a transmission belt 16. The speed ratio between the driving pulley 14 and the driven pulley 15 can be equal, or can be set based on the power range of the applicable external power source 7 and the power of the motor 1. The rotating shaft of the driving pulley 14 is rotatably supported by the housing of the access component 8, and a power interface is set at one end of the rotating shaft of the driving pulley 14, and the end of the output shaft 9 can be coupled to the power interface. The power interface is roughly parallel to the rotating shaft 4 toward the rear side or the front side of the power system, so that the output shaft 9 is connected parallel to the rotating shaft 4. The transmission belt 16 can be a flat belt, a V-belt, a toothed belt (synchronous belt). The driving pulley 14 and the driven pulley 15 are set accordingly according to the type of the transmission belt 16. Figure 3 Other aspects of the power system in the previous reference Figure 1 The power systems described are the same or similar and will not be described again.

[0037] See also Figure 4 The transmission element arranged in the housing of the access component 8 in the power system includes a driving sprocket (driving element) 17 suitable for connecting to the output shaft 9 and a driven sprocket (driven element) 18 fixed on the rotating shaft 4. The driving sprocket 17 and the driven sprocket 18 are coupled through a transmission chain 19. The speed ratio between the driving sprocket 17 and the driven sprocket 18 can be equal, or can be set based on the power range of the applicable external power source 7 and the power of the motor 1. The rotating shaft of the driving sprocket 17 is rotatably supported by the housing of the access component 8, and a power interface is arranged at one end of the rotating shaft of the driving sprocket 17, and the end of the output shaft 9 can be coupled to the power interface. The power interface is roughly parallel to the rotating shaft 4 toward the rear side or the front side of the power system, so that the output shaft 9 is connected parallel to the rotating shaft 4. Figure 4 Other aspects of the power system in the previous reference Figure 1 The power systems described are the same or similar and will not be described again.

[0038] Those skilled in the art can design other forms of access components 8 according to the principles of the present application. Furthermore, those skilled in the art can apply the power system including the access component 8 of the present application to other forms of engineering machinery.

[0039] Further, in the various exemplary embodiments described above, the driven member in the transmission element of the access component 8 is fixed on the rotating shaft 4. In this structure, when the motor 1 is running, the rotating shaft 4 drives the working element (concrete tank 6) through the gearbox 5, and the driven member and the active member are dragged by the rotating shaft 4. If it is not desired to drag the transmission element of the access component 8 when the motor 1 is running, the driven member can be installed on the sleeve shaft, and a clutch can be arranged between the sleeve shaft and the rotating shaft 4. The clutch can be manually controlled, electrically controlled, hydraulically controlled, or pneumatically controlled. When the clutch is in the disengaged state, the sleeve shaft is disengaged from the rotating shaft 4, and the rotation of the rotating shaft 4 will not drag the sleeve shaft and the transmission element. When the clutch is in the engaged state, the sleeve shaft is coupled to the rotating shaft 4, and the transmission element will drive the rotating shaft 4 to rotate.

[0040] According to a further embodiment, only the driven element of the transmission element of the access component 8 is arranged in the housing of the access component 8. For example, in the various examples described above, only the driven bevel gear 11, the worm gear 13, the driven pulley 15, and the driven sprocket 18 are respectively arranged in the housing, and the other parts of the transmission element (including the active element and possible transmission elements, respectively, the active bevel gear 10, the worm 12, the active pulley 14 and the transmission belt 16, the active sprocket 17 and the transmission chain 19 in the previous example) are placed in a storage space such as a tool box when it is not necessary to access the external power source 7. The housing of the access component 8 is provided with an opening facing the active element, and the opening is closed by a closing element such as a cover or a door. When it is necessary to access the external power source 7, the closing element can be opened to couple the other parts of the transmission element with the driven element in the housing. This method can reduce the number of elements of the motor 1 that are idling. It should be noted that for the access assembly 8 using a belt drive or chain drive, the drive belt 16 or the drive chain 19 can be designed to be disconnectable and engageable, and the drive belt 16 or the drive chain 19 can be installed around the driven pulley 15 or the driven sprocket 18 when the drive belt 16 or the drive chain 19 is disconnected, and then the two ends of the drive belt 16 or the drive chain 19 are engaged to form a complete annular drive belt 16 or the drive chain 19. Alternatively, the drive belt 16 or the drive chain 19 can be a complete annular drive belt 16 or the drive chain 19, and the rotating shaft 4 is designed to include a detachable shaft section; after the shaft section is removed, the drive belt 16 or the drive chain 19 can be installed around the driven pulley 15 or the driven sprocket 18, and then the shaft section can be reinstalled.

[0041] Those skilled in the art can make various adaptive modifications to the power system of the present application based on the application scenario.

[0042] According to the power system for engineering machinery of the present application, the power interface is arranged between the motor and the gearbox, and the power interface is arranged on the upper side or the lateral side of the power system, so that the external power source can be connected from the upper side or the lateral side of the power system, and there is no need to leave space for the external power source on the rear side of the motor, thereby facilitating the layout of the power system. In addition, since there is no need to connect the external power source on the rear side of the motor, the inverter of the motor can be flexibly arranged on the rear side, the upper side, or the lateral side of the motor. In addition, the power interface points to the radial outward direction or the axial forward or rearward direction of the power system, and the direction of the power interface can be flexibly set according to the specific form of the engineering machinery, so that the external power source can be connected to the power system in the most convenient way.

[0043] Although the present application is described herein with reference to specific embodiments, the scope of the present application is not limited to the details shown. Various modifications may be made to these details without departing from the basic principles of the present application.

Claims

1. A power system for engineering machinery, comprising: A motor (1), a gearbox (5) and an operating element, wherein the power of the motor (1) is transmitted to the gearbox (5) via a rotating shaft (4), and the gearbox (5) drives the operating element; characterized in that the power system also includes an access component (8) for accessing an external power source (7), the access component (8) is arranged around the rotating shaft (4) between the motor (1) and the gearbox (5), the access component (8) includes an active element suitable for coupling with the external power source (7) and a driven element coupled to the active element and driven by the active element, the driven element being configured to drive the rotating shaft (4).

2. The power system for engineering machinery according to claim 1, characterized in that: The active element is provided with a power interface suitable for coupling with an external power source (7), the power interface is arranged above or on the lateral side of the rotating shaft (4), and the power interface points in the radial outward direction of the power system or in the forward or backward direction parallel to the axial direction.

3. The power system for engineering machinery according to claim 2, characterized in that: The power interface is provided with a structure suitable for matching with the end of an output shaft (9) of an external power source (7).

4. The power system for engineering machinery according to claim 1, characterized in that: The access component (8) has a housing, which is fixed to at least one of the motor (1) and the gearbox (5).

5. The power system for engineering machinery according to claim 4, characterized in that: The active element and the driven element are both arranged inside the housing; Alternatively, the driven element is arranged inside the housing, and the active element is arranged outside the housing.

6. The power system for engineering machinery according to any one of claims 1 to 5, characterized in that: The driven element is fixed on the rotating shaft (4); Alternatively, the driven element is arranged around the rotating shaft (4) via a sleeve shaft, and a clutch is provided between the sleeve shaft and the rotating shaft (4).

7. The power system for engineering machinery according to any one of claims 1 to 5, characterized in that: The active element is a driving bevel gear (10), and the driven element is a driven bevel gear (11) meshing with the active bevel gear (10); Alternatively, the active element is a worm (12), and the driven element is a worm wheel (13) meshing with the worm (12); Alternatively, the active element is a driving pulley (14), the driven element is a driven pulley (15), and the active pulley (14) and the driven pulley (15) are coupled via a transmission belt (16); Alternatively, the active element is a driving sprocket (17), the driven element is a driven sprocket (18), and the active sprocket (17) and the driven sprocket (18) are coupled via a transmission chain (19).

8. The power system for engineering machinery according to any one of claims 1 to 5, characterized in that: The transmission ratio between the active element and the driven element is set based at least on the power of the external power source (7) and the power of the motor (1).

9. The power system for engineering machinery according to any one of claims 1 to 5, characterized in that: The motor (1) is equipped with an inverter (2), and the inverter (2) is arranged on the rear side, the upper side, or the lateral side of the motor (1).

10. The power system for engineering machinery according to any one of claims 1 to 5, characterized in that: The engineering machinery is a concrete tank truck, and the operating element is a concrete tank (6).

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