Modularized pump driving system

Abstract

A modular pump drive system includes: an input module including at least one motor providing power input; the output module comprises at least one output pump unit; one end of the transmission module is in power connection with the input module, the other end of the transmission module is in power connection with the output module, the transmission module comprises a plurality of input shafts, the input shafts are in power connection with sun gears of the planetary speed reduction units through the parallel speed reduction units, and planet carriers of the planetary speed reduction units are in power connection with the output shafts. According to the pump driving system, primary speed reduction and torque increase are achieved through the parallel speed reduction units, meanwhile, the number of the input shafts and the number of the input units can be matched according to the actual requirement of the system, and modular expansion of the input ends is achieved. The planetary speed reduction unit is used for achieving two-stage speed reduction and torque increasing, meanwhile, output is achieved through the planet carrier, the possibility is provided for subsequent output end expansion, and the number of the output ends can be flexibly selected according to the actual requirement of a system.

Description

Technical Field

[0001] The present invention relates to the field of power transmission and drive systems, and in particular to a modular pump drive system applied to an electric drive system. Background Art

[0002] In the context of the carbon neutrality agreement, with the country's subsidies for new energy policies and people's deepening recognition of new energy technologies, electric drive systems are increasingly used in engineering machinery, new energy vehicles and other fields, and pump drive systems are extremely common in engineering machinery. Research on electric drive pump drive systems with large torque, small space, low cost and wide application has become an inevitable development trend. At present, the development of electric drive systems in the fields of engineering machinery and new energy has been changing with each passing day. With the development, electric drive pump drive systems are becoming more and more widely used in the field of engineering machinery. However, multiple pump drive systems are often required on a certain vehicle, and in the product development stage, different parts also mean more cost investment, so higher requirements are put forward for the integration of multiple pump drive systems.

[0003] Through searching, technical documents of various related pump drive systems have been disclosed in the prior art. For example, the utility model authorization announcement document with the publication number "CN220378418U" and the name "A Mud Pump Drive Structure". A mud pump drive structure is disclosed, including a motor for providing power, a speed change mechanism and a mud pump, the output end of the motor is connected to the input end of the speed change mechanism, and the output end of the speed change mechanism is connected to the input end of the mud pump; the speed change mechanism is a parallel shaft reducer; the input end and the output end of the speed change mechanism are located on the same side, and the motor is located above the mud pump. The pump drive system involved in this comparative document cannot flexibly select the number of power inputs according to the needs of the system, and its flexibility and expansibility are poor.

[0004] For example, the utility model authorization announcement document with the publication number "CN216241555U" and the name "A modular pump-driven aluminum strip sewing machine hydraulic system". A modular pump-driven aluminum strip sewing machine hydraulic system is disclosed, including a motor and two sets of pump-driven aluminum strip sewing machine hydraulic modules. Each set of pump-driven aluminum strip sewing machine hydraulic modules is independently provided with a hydraulic pump, and the two hydraulic pumps are coaxially driven by the same motor; each set of pump-driven aluminum strip sewing machine hydraulic modules is provided with two sewing hydraulic cylinders, and the hydraulic pumps are respectively connected to the piston chambers of the two sewing hydraulic cylinders through hydraulic pipelines, and throttle valves are respectively provided on the hydraulic pipelines. In the technical solution disclosed in this comparative document, the number of power inputs cannot be flexibly selected according to the system requirements, and it cannot be applied to the transmission conditions of the electric drive system. Summary of the invention

[0005] In view of the deficiencies of the prior art, the present invention provides a modular pump drive system, comprising: An input module, comprising at least one motor to provide power input; an output module, comprising at least one output pump unit; A transmission module has one end connected to the input module and the other end connected to the output module. The transmission module includes multiple input shafts, which are connected to the sun gear of the parallel reduction unit and the planetary reduction unit through a parallel reduction unit. The planetary carrier of the planetary reduction unit is connected to the output module through a parallel reduction unit.

[0006] Furthermore, it also includes a first driven shaft, the first driven shaft is connected to a primary driven gear and a sun gear, the primary driven gear is meshed with an input shaft, and the input shaft is symmetrically distributed relative to the center of the driven shaft.

[0007] Furthermore, it also includes an upper housing and an intermediate housing, and the first driven shaft, the input shaft and the planetary reduction unit are all connected to the upper housing and the intermediate housing.

[0008] Furthermore, the planet carrier is dynamically connected to the second driving shaft, the second driving shaft is connected to a secondary driving gear, and the secondary driving gear is meshed with the output shaft.

[0009] Furthermore, the output shafts are multiple and are distributed symmetrically around the second driving shaft.

[0010] Furthermore, the number of the input shafts and the output shafts is the same, and each group of input shafts and output shafts are coaxial.

[0011] Furthermore, the first driven shaft and the second driving shaft are coaxial.

[0012] Furthermore, it also includes a lower shell, and the output shaft and the second driving shaft are both connected between the intermediate shell and the lower shell.

[0013] Furthermore, helical gear meshing is adopted between the input shaft and the primary driven gear and between the output shaft and the secondary driving gear.

[0014] Furthermore, an input shaft hole is provided on the inner side of the upper shell body, and an output shaft hole is provided on the lower shell body; both the input shaft hole and the output shaft hole are stepped holes; an input bearing is installed in the input shaft hole, and an output bearing is installed in the output shaft hole; the helical tooth rotation direction of the input shaft is such that its axial force is directed toward the input bearing, and the helical tooth rotation direction of the output shaft is such that its axial force is directed toward the output bearing.

[0015] Compared with the prior art, the technical solution of the present application has the following beneficial effects: the pump drive system provided by the present invention uses a parallel reduction unit to achieve a first-stage reduction and torque increase, and can match the number of input shafts and input units according to the actual needs of the system to achieve modular expansion of the input end. While using a planetary reduction unit to achieve a second-stage reduction and torque increase, and using its planetary carrier output, it provides the possibility for subsequent output end expansion, and the number of output ends can be flexibly selected according to the actual needs of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 : Schematic diagram of the overall structure of the modular pump drive system; Figure 2 :Schematic diagram of the internal structure of the modular pump drive system Figure 1 ; Figure 3 :Schematic diagram of the internal structure of the modular pump drive system Figure 2 . DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Example 1

[0018] like Figure 1 and Figure 2 A modular pump drive system, comprising: The input module 100 includes at least one motor to provide power input; The output module 300 includes at least one output pump unit; The transmission module 200 has one end connected to the input module 100 and the other end connected to the output module 300. The transmission module 200 includes multiple input shafts 1. The input shafts 1 are connected to the sun gear 21 of the planetary reduction unit 2 through a parallel reduction unit. The planet carrier 22 of the planetary reduction unit 2 is connected to the output module 300.

[0019] In this embodiment, the input module 100 uses a motor as a power source. The output module 300 uses a pump unit such as a hydraulic pump or an oil pump as an output. The power acts on the input shaft 1 through the motor, and after the first-level torque increase through the parallel reduction unit, it passes through the second-level torque increase through the planetary reduction unit 2, so that a larger torque output can be achieved. The parallel reduction unit and the sun gear 21 of the planetary reduction unit 2 are power-connected, which can minimize the axial space of the transmission module 200 and improve the integration of the entire system. This pump drive system can utilize parallel reduction units to realize torque transmission of multiple input shafts 1, and can flexibly select the number of input units according to the overall design requirements of the system torque or power, thereby improving the overall flexibility and scalability of the system.

[0020] like Figure 2 As shown, the parallel reduction unit in the pump drive system includes a first driven shaft 4, the first driven shaft 4 is connected to a primary driven gear 41 and a sun gear 21, the primary driven gear 41 is meshed with an input shaft 1, and the input shaft 1 is symmetrically distributed relative to the center of the driven shaft 4. It can be understood that the parallel reduction unit is not limited to only one-stage reduction transmission, and can have multiple stages of reduction and torque increase. On the one hand, the parallel reduction unit can save axial space as much as possible, and on the other hand, the first driven shaft 4 can simultaneously mesh and drive multiple input shafts 1 to realize multi-motor power torque transmission.

[0021] In a more preferred embodiment, an upper housing 6 and an intermediate housing 7 are also included, and the first driven shaft 4, the input shaft 1 and the planetary reduction unit 2 are all connected to the upper housing 6 and the intermediate housing 7. Under this structural design, the entire parallel reduction unit and the planetary reduction unit 2 are installed in the upper housing 6 and the intermediate housing 7, and the system has a high degree of integration. The parallel reduction unit cooperates with the planetary reduction unit 2 to form a higher speed ratio to reduce the speed, ensuring that the output energy of the planetary carrier is in a higher efficiency range of the motor.

[0022] In a more preferred embodiment, the planetary carrier 22 is connected to the second driving shaft 5 by power, and the second driving shaft 5 is connected to a secondary driving gear 51, and the secondary driving gear 51 is meshed with the output shaft 3. In this embodiment, the planetary carrier 22 is connected to a parallel reduction mechanism after transmitting power. The second driving shaft 5 can mesh with multiple output shafts 3 to form a multi-interface output. The number of output shafts 3 can be configured according to the actual output needs of the system, and ultimately determines the number of pump units connected to the output module 300. Therefore, the number of input and output interfaces of the pump drive system can be flexibly configured.

[0023] In a more preferred embodiment, the output shafts 3 are multiple and are symmetrically distributed around the second driving shaft 5. At the output end, after the multiple output shafts 3 are connected to the output module 300, it is preferred that they can achieve torque balance as much as possible to reduce unnecessary noise and vibration of the system at the output end. Therefore, in this embodiment, the output shafts 3 are symmetrically distributed around the second driving shaft 5. For example, when the number of output shafts 3 is three, these output shafts 3 will be distributed at an angle of 120 degrees with respect to each other around the second driving shaft 5 to achieve maximum torque balance.

[0024] In a more preferred embodiment, the number of the input shafts 1 and the output shafts 3 is the same, and each set of the input shafts 1 and the output shafts 3 are coaxial. Based on the same considerations as above, although the input end has a higher speed and a smaller torque, based on the consideration of the torque balance of the entire pump drive system, each input shaft 1 is preferably distributed in the same symmetrical manner as the output shaft 3, so the input end is similar to the aforementioned output end, and the input power torque is balanced.

[0025] In a more preferred embodiment, the first driven shaft 4 and the second driving shaft 5 are coaxial. The pump drive system designed in this way is symmetrical as a whole, the torque between each transmission shaft and the input and output shafts will be more balanced, and the operation of the system will be more stable and reliable.

[0026] like Figure 3 As shown. In a more preferred embodiment, a lower housing 8 is further included, and the output shaft 3 and the second driving shaft 5 are connected between the intermediate housing 7 and the lower housing 8. In this highly integrated structural design, each shaft and gear are installed between the upper housing 6, the intermediate housing 7, and the lower housing 8. The entire pump drive system forms a highly integrated and flexibly configurable modular design.

[0027] like Figure 3 As shown. The specific structure of the pump drive system can be that the input shaft hole 11 is opened on the inner side of the upper shell 6, and the output shaft hole 31 is opened on the lower shell 8. The input shaft hole 11 and the output shaft hole 31 are both stepped holes. An input bearing 12 is installed in the input shaft hole 11, and an output bearing 32 is installed in the output shaft hole 31; the helical tooth rotation direction of the input shaft 1 makes its axial force input to the bearing 12, and the helical tooth rotation direction of the output shaft 3 makes its axial force toward the output bearing 32. The input shaft hole 11 and the output shaft hole 31 are designed as stepped shaft holes, so that the pump drive system can flexibly select suitable matching bearings to be installed in the input shaft hole 11 and the output shaft hole 31 according to the speed and torque required by the system at the input and output shaft ends, and there is no need to frequently process the shaft holes according to the system requirements with different needs. The helical tooth rotation direction of the input shaft 1 and the output shaft 3 is adjusted and designed so that the axial force can be directed toward the input bearing 12 and the output bearing 32, thereby improving the torque and speed load capacity of the input and output shaft ends.

[0028] When the required speed is high and the torque is relatively high, the structure can cancel the lower housing 8 and the second driving shaft 5 and use the planetary carrier output. When two or more outputs are required, the lower housing 8 and the parallel reduction mechanism in the period can be connected to connect multiple outputs, and the output shaft hole can be omitted if the output interface is not required.

[0029] In a more preferred embodiment, the input shaft 1 and the primary driven gear 41 and the output shaft 3 and the secondary driving gear 51 are meshed with helical or herringbone teeth, so that the meshing power transmission between the gears is more stable and has less noise.

[0030] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0031] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A modular pump drive system, characterized in that: include: An input module, comprising at least one motor to provide power input; an output module, comprising at least one output pump unit; A transmission module, one end of which is power-connected to an input module, and the other end of which is power-connected to an output module, the transmission module comprising a plurality of input shafts (1), the input shafts (1) being power-connected to a sun gear (21) of a planetary reduction unit (2) via a parallel reduction unit, and the planet carrier (22) of the planetary reduction unit (2) being power-connected to the output module.

2. The modular pump drive system according to claim 1, characterized in that: It also includes a first driven shaft (4), the first driven shaft (4) being connected to a primary driven gear (41) and a sun gear (21), the primary driven gear (41) being meshed with an input shaft (1), and the input shaft (1) being symmetrically distributed relative to the center of the driven shaft (4).

3. The modular pump drive system according to claim 2, characterized in that: It also comprises an upper housing (6) and an intermediate housing (7), wherein the first driven shaft (4), the input shaft (1) and the planetary reduction unit (2) are all connected to the upper housing (6) and the intermediate housing (7).

4. The modular pump drive system according to claim 3, characterized in that: The planet carrier (22) is power-connected to the second driving shaft (5); the second driving shaft (5) is connected to a secondary driving gear (51); and the secondary driving gear (51) is meshed with the output shaft (3).

5. The modular pump drive system according to claim 4, characterized in that: The output shafts (3) have a plurality of shafts and are distributed symmetrically around the second driving shaft (5).

6. The modular pump drive system according to claim 5, characterized in that: The input shafts (1) and output shafts (3) are of the same number, and each set of input shafts (1) and output shafts (3) are coaxial.

7. The modular pump drive system according to claim 6, characterized in that: The first driven shaft (4) and the second driving shaft (5) are coaxial.

8. The modular pump drive system according to claim 7, characterized in that: It also includes a lower housing (8), and the output shaft (3) and the second driving shaft (5) are both connected between the intermediate housing (7) and the lower housing (8).

9. The modular pump drive system according to claim 8, characterized in that: Helical gear meshing is adopted between the input shaft (1) and the primary driven gear (41), and between the output shaft (3) and the secondary driving gear (51).

10. The modular pump drive system according to claim 9, characterized in that: An input shaft hole (11) is formed on the inner side of the upper housing (6), and an output shaft hole (31) is formed on the lower housing (8); the input shaft hole (11) and the output shaft hole (31) are both stepped holes; an input bearing (12) is installed in the input shaft hole (11), and an output bearing (32) is installed in the output shaft hole (31); the helical teeth of the input shaft (1) are rotated in such a way that the axial force is directed toward the input bearing (12), and the helical teeth of the output shaft (3) are rotated in such a way that the axial force is directed toward the output bearing (32).

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