Controller shell assembly of motor pump unit, motor pump unit and installation method of motor pump unit

Abstract

The invention discloses a controller shell assembly of a motor pump unit, the motor pump unit and an installation method of the motor pump unit. The controller shell assembly of the motor pump unit comprises a main shell, and a main cavity for installing a control assembly is formed in the main shell; the bottom of the main shell extends downwards to form an auxiliary cavity, and the auxiliary cavity communicates with the main cavity. The two sides of the auxiliary chamber are opened; the motor end of the motor pump unit is fixedly connected with the opening in the auxiliary cavity in a sealed mode through a sealing fastener, and the pump connecting end of the motor pump unit is arranged in an overhanging mode. And the connecting bracket is arranged between the pump connecting end of the motor pump unit and the main shell. The problem that the motor pump unit and the controller shell are difficult to seal is solved, the connecting support structure is arranged, the structural strength of shell connection is enhanced through the connecting support structure, and the motor pump unit is suitable for being installed on a vehicle and meets the requirement for vibration in the vehicle running process.

Description

Technical Field

[0001] The present invention relates to the technical field of motor pump units, and in particular to a controller housing assembly of a motor pump unit, a motor pump unit and an installation method thereof. Background Art

[0002] The motor pump unit is mainly used in the active suspension system of automobiles. It has the characteristics of high integration, small space size, simple structure, excellent sealing performance, easy disassembly and assembly, and can be disassembled and assembled multiple times. The housing of the MPU usually includes two motor housings and a controller housing arranged on the top of the two motor housings, wherein the controller housing and the two motor housings are bonded to each other by sealants and connected by bolts. The two motor housings are bonded by sealants. That is, the sealing between the three housings of the MPU is mainly achieved by sealants, and the long-term sealing is general. In addition, due to the fluidity of the sealant, uneven application is prone to occur during application, and the sealant needs to be cleaned and new sealant needs to be applied after each disassembly. The operation steps are cumbersome and the cost is high.

[0003] There are also controller housings and two motor housings that are fixed by multiple sets of bolts and sealed by gaskets, but the mold is complex and the production cost is high. In addition, the assembly requires multiple sets of bolts to fix, and there is still a risk of seal failure, especially in the triangular area where the horizontal and vertical intersections are prone to gaps, which may cause seal failure.

[0004] In addition, whether the controller housing and the two motor housings are bonded by sealant or fixed by multiple sets of bolts and sealed by sealing gaskets, they are all space structure seals with poor manufacturability. Summary of the invention

[0005] In view of the above technical problems, the present invention proposes a controller housing assembly of a motor pump unit, a motor pump unit and an installation method thereof. The housing assembly solves the problem of difficult sealing between the motor pump unit and the controller housing, and is provided with a connecting bracket structure. The connecting bracket structure strengthens the structural strength of the housing connection, ensures the connection strength between the housings, is suitable for installation on a vehicle and meets the vibration requirements during vehicle driving.

[0006] In order to achieve the above technical objectives, the present invention adopts the following technical solutions:

[0007] A controller housing assembly of a motor pump unit, comprising:

[0008] A main housing, wherein a main chamber for installing a control component is provided inside the main housing; the bottom of the main housing extends downward to form a sub-chamber, the sub-chamber is connected to the main chamber; openings are provided on both sides of the sub-chamber;

[0009] The motor end of the motor pump unit is sealed and fixedly connected to the opening of the sub-chamber through a sealing fastener, and the pump connection end of the motor pump unit is cantilevered;

[0010] The connecting bracket is arranged between the pump connecting end of the motor pump unit and the main housing to fix the pump connecting end of the motor pump assembly to the main housing.

[0011] Beneficial effects: The controller housing assembly of the motor pump unit of the present invention has a main chamber for installing the control assembly, the bottom of the main housing extends downward to form a sub-chamber, and the two sides of the sub-chamber are opened;

[0012] A sealed fixed connection is achieved between the motor end of the motor pump unit and the opening on the sub-chamber, and a complex spatial seal is designed as a simple plane seal, which improves the sealing effect and has good assemblability, improves product quality and reduces manufacturing costs.

[0013] In an optional embodiment, the middle position of the bottom of the main shell (1) extends downward to form the sub-chamber, one side of the sub-chamber is provided with a first opening connected to the sub-chamber, and the other side of the sub-chamber is provided with a second opening connected to the sub-chamber, the first opening and the second opening are connected and are symmetrically arranged at the middle position of the bottom of the main shell (1); the first opening is equipped with a pump connection end of a first motor pump unit, and the second opening is equipped with a pump connection end of a second motor pump unit.

[0014] Beneficial effect: In this embodiment, the sub-chamber is located in the middle of the bottom of the main shell, and the first motor pump unit and the second motor pump unit are symmetrically arranged on the left and right sides of the sub-chamber. This structure can balance the force.

[0015] In an optional embodiment, the motor housing of the motor pump unit is provided with a first flange at the end, and the housing of the secondary chamber is provided with a second flange at the two opening side ends;

[0016] The sealing fastener comprises:

[0017] A plurality of bolts connected between the first flange and the second flange to fasten the first flange and the second flange together;

[0018] A sealing member is disposed between the first flange and the second flange to seal the first flange and the second flange.

[0019] Beneficial effect: In this embodiment, the motor pump unit and the main housing are preferably fastened together by flanges and bolts which are very mature and reliable in the art, and sealed by sealing members, thereby ensuring a reliable fixed connection between the motor pump unit and the main housing.

[0020] In an optional embodiment, the first flange is integrally formed with the motor housing of the motor pump unit, and the first flange is formed by the motor housing of the motor pump unit extending radially outwardly along the motor housing;

[0021] The second flange is integrally formed with the outer shell of the sub-chamber, and the second flange is formed by the outer shell of the sub-chamber extending radially outwardly along the outer shell of the sub-chamber.

[0022] Beneficial effect: In this embodiment, the first flange is integrally formed with the motor housing of the motor pump unit, and the second flange is integrally formed with the housing of the sub-chamber. This solution adopts a mature application design structure, has a simple structure, is easy to process and manufacture, and has reliable connection strength and reliable sealing effect.

[0023] In an optional embodiment, the sealing member is an O-ring, and an O-ring groove for mounting the O-ring is provided on the second connecting flange.

[0024] Beneficial effects: In this embodiment, the seal adopts a conventional O-ring design with a simple structure, the sealing structure is reliable, the manufacturing process is mature and stable, the manufacturing cost is low, and the sealing effect is good.

[0025] In an optional embodiment, one end of the connecting bracket is provided with a first mounting surface, and the other end of the connecting bracket is provided with a second mounting surface.

[0026] A first mounting hole is provided on the first mounting surface, and a first connecting bracket mounting hole matching the first mounting hole is provided on the main housing near the end of the housing;

[0027] A second mounting hole is provided on the second mounting surface, and a second connecting bracket mounting hole matching the second mounting hole is provided on the pump connecting end of the motor pump unit.

[0028] Beneficial effects: In this embodiment, because the motor pump unit of the present invention is installed with the main housing in a cantilever beam structure, in order to increase the structural strength, connecting brackets are designed at both ends to fix the assembly, thereby enhancing the overall strength of the assembly and preventing damage caused by bumps and vibrations on the vehicle.

[0029] In an optional embodiment, the first mounting surface and the second mounting surface intersect vertically.

[0030] Beneficial effect: In this embodiment, the two mounting surfaces of the connecting bracket are designed as a 90-degree structure, and this structural design allows the position of the motor and the mounting hole of the main housing to be dispersed. No installation stress will be caused during assembly due to the position dispersion, and the structural strength is improved.

[0031] In an optional embodiment, a third opening is provided on the top of the main shell, and an upper cover detachably connected to the main shell is provided at the third opening.

[0032] Beneficial effect: In this embodiment, an upper cover detachably connected to the main shell is provided on the top of the main shell. The control component can be installed by opening the upper cover, which also facilitates subsequent maintenance and replacement of the control component.

[0033] The present invention further discloses a motor pump unit, which includes a controller housing assembly of the motor pump unit.

[0034] The present invention further discloses an installation method based on the motor pump unit, comprising the following steps:

[0035] 1) Assemble the first hydraulic pump to the first motor to form a first motor pump assembly; assemble the second hydraulic pump 3 to the second motor to form a second motor pump assembly;

[0036] 2) installing an O-ring in a sealing groove of a first opening on the main housing, and fixing the first motor pump unit to the first opening of the main housing by bolts;

[0037] 3) Assemble the first connecting bracket, fit the first mounting surface of the first connecting bracket to the end of the first connecting bracket mounting hole of the main housing, and fit the second mounting surface of the first connecting bracket to the end surface of the bolt hole of the first hydraulic pump; respectively pass bolts through the first mounting surface of the first connecting bracket and the first connecting bracket mounting hole of the main housing, and the second mounting surface of the first connecting bracket and the bolt hole of the hydraulic pump, so that the first connecting bracket fixes the pump connection end of the first motor pump assembly to the main housing;

[0038] 4) Assemble the O-ring into the sealing ring groove of the second opening of the main housing 1, and fix the second motor pump unit to the second opening of the main housing by bolts;

[0039] 5) Assemble the second connecting bracket, fit the first mounting surface of the second connecting bracket with the end of the second connecting bracket mounting hole of the main housing, and fit the second mounting surface of the second connecting bracket with the bolt hole end of the second hydraulic pump; respectively pass bolts through the first mounting surface of the second connecting bracket and the first connecting bracket mounting hole of the main housing, and through the second mounting surface of the second connecting bracket and the bolt hole of the second hydraulic pump, so that the second connecting bracket fixes the pump connection end of the second motor pump assembly to the main housing;

[0040] 6) Install the controller PCB board into the main chamber of the main housing, connect the three-phase wires with the first motor and the second motor through wires, and connect the high and low voltage connectors to the controller PCB board through wires;

[0041] 7) Assemble the upper cover and seal to complete the assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1It is a front view of the motor pump unit of the present invention after assembly;

[0043] Among them, 1 is the main housing; 2 is the motor pump unit; 3 is the pump connection end of the motor pump unit; 4 is the first connection bracket; 5 is the second connection bracket; 6 is the upper cover; 7 is the upper cover fixing screw; 8 is the connection bracket screw; 9 is the hydraulic pump screw; 11 is the motor fixing screw;

[0044] Figure 2 An exploded view of the motor pump unit of the present invention;

[0045] Among them, 2.1 is the first motor; 2.2 is the second motor; 3.1 is the first hydraulic pump; 3.2 is the second hydraulic pump; 12.1 is the first O-ring; 12.2 is the second O-ring;

[0046] Figure 3 It is a structural schematic diagram of the main housing of the present invention;

[0047] Among them, 1.1 is the main chamber; 1.2 is the auxiliary chamber; 1.3 is the upper cover fixing bolt hole; 1.4 is the connecting bracket installation hole; 1.5 is the motor fixing bolt hole; 1.6 is the O-ring groove;

[0048] Figure 4 It is a structural schematic diagram of the connecting bracket of the present invention;

[0049] Among them, 4.1 is the first mounting surface; 4.2 is the second mounting surface; 4.3 is the first mounting hole; and 4.4 is the second mounting hole.

[0050] Figure 5 This is the principle diagram of the processing and assembly deviation of parts of the I-shaped bracket;

[0051] Figure 6 This is the compensation principle of the L-shaped bracket for the dispersion of parts processing and assembly. DETAILED DESCRIPTION

[0052] The technical solution of the present invention is further described in detail below in conjunction with specific embodiments and the accompanying drawings so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0053] Example 1

[0054] like Figure 1 and Figure 2 As shown, a controller housing assembly of a motor pump unit includes a main housing 1, a first motor 2.1, a second motor 2.2, a first hydraulic pump 3.1, and a second hydraulic pump 3.2.

[0055] The first motor 2.1 is mounted on the left side of the lower part of the main housing 1. The first motor 2.1 and the main housing 1 are sealed by a first O-ring 12.1 and are fastened by motor fixing screws. The first hydraulic pump 3.1 is fastened by hydraulic pump screws.

[0056] The second motor 2.2 is assembled on the right side of the lower part of the main housing 1. The second motor 2.2 and the main housing 1 are sealed by a second O-ring 12.2 and are fastened by motor fixing screws; the second hydraulic pump 3.2 is fastened by hydraulic pump screws 9.

[0057] Figure 3 This is a structural diagram of the main shell 1. A main chamber 1.1 and a sub-chamber 1.2 are designed in the main shell 1. The sub-chamber 2 is formed by extending downward from the bottom of the main chamber 1.1, and the sub-chamber 1.2 is connected to the main chamber 1.1.

[0058] O-ring grooves 1.6 and motor fixing bolt holes 1.5 are designed on both sides of the auxiliary chamber 1.2; the O-ring grooves 1.6 and the bolt holes 1.5 are symmetrically designed on the main shell to facilitate installation of a motor on each side; the motor wires pass through the auxiliary chamber 1.2, enter the main chamber 1.1 and are connected to the controller.

[0059] A sealed fixed connection is achieved between the motor end of the motor pump unit and the opening on the sub-chamber, and a complex spatial seal is designed as a simple plane seal, which improves the sealing effect and has good assemblability, improves product quality and reduces manufacturing costs.

[0060] As a preferred solution of embodiment 1, the motor housing of the motor pump unit is provided with a first flange at the end, and the housing of the secondary chamber is provided with a second flange at the two opening side ends;

[0061] The sealing fastener comprises:

[0062] A plurality of bolts are connected between the first flange and the second flange to fasten the first flange and the second flange. Preferably, the motor pump unit and the main housing are fastened by flanges and bolts which are very mature and reliable in the art, and sealed by an O-ring to ensure a reliable sealed and fixed connection between the motor pump unit and the main housing.

[0063] Furthermore, the first flange is integrally formed with the motor housing of the motor pump unit, and the first flange is formed by the motor housing of the motor pump unit extending radially outward from the motor housing; the second flange is integrally formed with the housing of the sub-chamber, and the second flange is formed by the housing of the sub-chamber extending radially outward from the housing of the sub-chamber. The first flange is integrally formed with the motor housing of the motor pump unit, and the second flange is integrally formed with the housing of the sub-chamber. This solution uses a mature application design structure, has a simple structure, is easy to process and manufacture, and has reliable connection strength and sealing effect.

[0064] As a further preferred solution of Example 1 of the present invention, the middle position of the bottom of the main housing extends downward to form the sub-chamber, and a first opening connected to the sub-chamber is provided on one side of the sub-chamber, and a pump connection end of the first motor pump unit is mounted on the first opening; a second opening connected to the sub-chamber is provided on the other side of the sub-chamber, and a pump connection end of the second motor pump unit is mounted on the second opening. The sub-chamber is located in the middle position of the bottom of the main housing, and the first motor pump unit and the second motor pump unit are symmetrically arranged on the left and right sides of the sub-chamber, and this structure can balance the force.

[0065] Example 2

[0066] In Example 1, because the motor pump unit of the present invention is installed with the main housing as a cantilever beam structure, in order to increase the structural strength, connecting brackets are designed at both ends to enhance the overall strength of the assembly and avoid damage due to bumps and vibrations on the vehicle.

[0067] A connecting bracket mounting hole 1.4 is designed on the side of the upper end of the main shell 1 for connecting the bracket to be installed to improve the overall structural strength of the assembly.

[0068] Figure 4 4. is a schematic diagram of the structure of the connecting bracket of the present invention. The connecting bracket is designed with two mounting surfaces, namely a first mounting surface 4.1 and a second mounting surface 4.2. The first mounting surface 4.1 is provided with a first mounting hole 4.3. The main shell is provided with a first connecting bracket mounting hole matching the first mounting hole at a position close to the shell end.

[0069] The second mounting surface 4.2 is provided with a second mounting hole 4.4, and the pump connecting end of the motor pump unit is provided with a second connecting bracket mounting hole matching the second mounting hole 4.4.

[0070] The first hydraulic pump 3.1 is connected to the main housing 1 via a first connecting bracket 4 and fixed with connecting bracket screws.

[0071] The second hydraulic pump 3.2 is connected to the main housing 1 via a second connecting bracket 5. One end of the second connecting bracket is fixed with a hydraulic pump screw, and the connecting end with the controller is fixed with a connecting bracket screw.

[0072] Example 3

[0073] The difference between this embodiment and the first and second embodiments is that the two mounting surfaces of the connecting bracket are designed at a 90-degree angle, that is, the first mounting surface 4.1 and the second mounting surface 4.2 intersect vertically. This structural design allows the position of the motor and the main housing mounting hole to vary, and will not cause installation stress during assembly due to positional variation, which can further improve the structural strength.

[0074] The compensation principle of L-shaped bracket for parts processing and assembly deviation:

[0075] Figure 5 The example shown is a simple I-shaped bracket, where parts 1 and 2 are assembled and the bottoms are aligned. Due to the difference in the height machining of parts 1 and 2, there will inevitably be a gap H between the I-shaped bracket and the mounting surface of part 2 after it is fitted with the mounting surface of part 1. Tightening the fixing bolts at this time will cause excessive installation stress between the three parts, and the parts are easily damaged when the vibration load is large.

[0076] Figure 6 The figure shows the assembly relationship of the L-shaped bracket. The L-shaped mounting surfaces are at a 90° angle. Even if there is a processing deviation in the parts, the two mounting surfaces can still fit well, there is no assembly stress, the strength of the assembly is guaranteed, and it can withstand higher vibration loads. The specific principle is that the aperture D of the bracket mounting hole is larger than the diameter M of the fastening bolt; the gap between the bolt and the bolt hole can be used to compensate for the processing and assembly deviation of the two parts. As shown in the figure below, the mounting surface 1 of the L-shaped bracket fits the mounting surface of part 1, and the mounting surface 2 of the L-shaped bracket fits the mounting surface of part 2. As long as the processing and assembly deviation of parts 1 and 2 is controlled within half of the difference between the bolt hole M and the bolt diameter D, it can ensure that the two mounting surfaces fit at the same time, and the bolts pass through the mounting holes smoothly to achieve the tightening effect and complete the assembly smoothly.

[0077] Example 4

[0078] In an optional embodiment, a third opening is provided on the top of the main housing, and an upper cover detachably connected to the main housing is provided at the third opening. An upper cover detachably connected to the main housing is provided on the top of the main housing, and the control component can be installed by opening the upper cover, which also facilitates later maintenance and replacement of the control component.

[0079] The present invention further discloses a motor pump unit, which includes a controller housing assembly of the motor pump unit.

[0080] The present invention further discloses an installation method based on the motor pump unit, comprising the following steps:

[0081] 1) Assemble the first hydraulic pump to the first motor to form a first motor pump assembly; assemble the second hydraulic pump 3 to the second motor to form a second motor pump assembly;

[0082] 2) installing an O-ring in a sealing groove of a first opening on the main housing, and fixing the first motor pump unit to the first opening of the main housing by bolts;

[0083] 3) Assemble the first connecting bracket, fit the first mounting surface of the first connecting bracket to the end of the first connecting bracket mounting hole of the main housing, and fit the second mounting surface of the first connecting bracket to the end surface of the bolt hole of the first hydraulic pump; respectively pass bolts through the first mounting surface of the first connecting bracket and the first connecting bracket mounting hole of the main housing, and the second mounting surface of the first connecting bracket and the bolt hole of the hydraulic pump, so that the first connecting bracket fixes the pump connection end of the first motor pump assembly to the main housing;

[0084] 4) Assemble the O-ring into the sealing ring groove of the second opening of the main housing 1, and fix the second motor pump unit to the second opening of the main housing by bolts;

[0085] 5) Assemble the second connecting bracket, fit the first mounting surface of the second connecting bracket with the end of the second connecting bracket mounting hole of the main housing, and fit the second mounting surface of the second connecting bracket with the bolt hole end of the second hydraulic pump; respectively pass bolts through the first mounting surface of the second connecting bracket and the first connecting bracket mounting hole of the main housing, and through the second mounting surface of the second connecting bracket and the bolt hole of the second hydraulic pump, so that the second connecting bracket fixes the pump connection end of the second motor pump assembly to the main housing;

[0086] 6) Install the controller PCB board into the main chamber of the main housing, connect the three-phase wires with the first motor and the second motor through wires, and connect the high and low voltage connectors to the controller PCB board through wires;

[0087] 7) Assemble the upper cover and seal to complete the assembly.

[0088] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited thereto. Various changes that can be made within the knowledge scope of technicians in the relevant technical field without departing from the spirit of the present invention are all within the protection scope of the claims of the present invention.

Claims

1. A controller housing assembly for a motor pump unit, characterized in that: include: A main housing (1), wherein a main chamber for installing a control component is provided inside the main housing; the bottom of the main housing extends downward to form a secondary chamber, the secondary chamber is connected to the main chamber; and openings are provided on both sides of the secondary chamber; The motor end of the motor pump unit is sealed and fixedly connected to the opening of the sub-chamber through a sealing fastener, and the pump connection end of the motor pump unit is cantilevered; A connecting bracket is arranged between the pump connecting end of the motor pump unit and the main housing (1) to fix the pump connecting end of the motor pump assembly to the main housing.

2. The controller housing assembly of the motor pump unit according to claim 1, characterized in that: The middle position of the bottom of the main housing (1) extends downward to form the secondary chamber, one side of the secondary chamber is provided with a first opening connected to the secondary chamber, and the other side of the secondary chamber is provided with a second opening connected to the secondary chamber, the first opening and the second opening are connected and are symmetrically arranged at the middle position of the bottom of the main housing (1); The first opening is equipped with a pump connection end of a first motor pump unit, and the second opening is equipped with a pump connection end of a second motor pump unit.

3. The controller housing assembly of the motor pump unit according to claim 1, characterized in that: The motor housing of the motor pump unit is provided with a first flange at the end, and the housing of the auxiliary chamber is provided with a second flange at the two opening side ends; The sealing fastener comprises: A plurality of bolts connected between the first flange and the second flange to fasten the first flange and the second flange; A sealing member is disposed between the first flange and the second flange to seal the first flange and the second flange.

4. The controller housing assembly of the motor pump unit according to claim 3, characterized in that: The first flange is integrally formed with the motor housing of the motor pump unit, and the first flange is formed by the motor housing of the motor pump unit extending radially outwardly from the motor housing; The second flange is integrally formed with the outer shell of the sub-chamber, and the second flange is formed by the outer shell of the sub-chamber extending radially outwardly along the outer shell of the sub-chamber.

5. The controller housing assembly of the motor pump unit according to claim 3, characterized in that: The sealing element is an O-type sealing ring, and the second connecting flange is provided with an O-type sealing ring groove (1.6) for installing the O-type sealing ring.

6. The controller housing assembly of the motor pump unit according to claim 1, characterized in that: A first mounting surface (4.1) is provided at one end of the connecting bracket, and a second mounting surface (4.2) is provided at the other end of the connecting bracket; a first mounting hole (4.3) is provided on the first mounting surface (4.1); a first connecting bracket mounting hole (1.4) matching the first mounting hole (4.3) is provided at a position close to an end of the shell on the main shell (1); a second mounting hole (4.4) is provided on the second mounting surface (4.2); and a second connecting bracket mounting hole matching the second mounting hole (4.4) is provided on a pump connection end of the motor pump unit.

7. The controller housing assembly of the motor pump unit according to claim 5, characterized in that: The first mounting surface (4.1) and the second mounting surface (4.2) intersect vertically.

8. The controller housing assembly of the motor pump unit according to claim 1, characterized in that: A third opening is provided on the top of the main shell (1), and an upper cover detachably connected to the main shell (1) is provided at the third opening.

9. A motor pump unit, characterized in that: The motor pump unit comprises the controller housing assembly of the motor pump unit according to any one of claims 1-8.

10. A method for installing the motor pump unit according to claim 9, characterized in that: The following steps are involved: 1) Assemble the first hydraulic pump to the first motor to form a first motor pump assembly; assemble the second hydraulic pump 3 to the second motor to form a second motor pump assembly; 2) installing an O-ring in a sealing groove of a first opening on the main housing, and fixing the first motor pump unit to the first opening of the main housing by bolts; 3) Assembling the first connecting bracket, fitting the first mounting surface of the first connecting bracket to the end of the first connecting bracket mounting hole of the main housing, and fitting the second mounting surface of the first connecting bracket to the end surface of the bolt hole of the first hydraulic pump; Bolts are respectively passed through the first mounting surface of the first connecting bracket and the first connecting bracket mounting hole of the main housing, and the bolt hole of the second mounting surface of the first connecting bracket and the hydraulic pump, so that the first connecting bracket fixes the pump connecting end of the first motor pump assembly to the main housing; 4) Assemble the O-ring into the sealing ring groove of the second opening of the main housing 1, and fix the second motor pump unit to the second opening of the main housing by bolts; 5) Assemble the second connecting bracket, fit the first mounting surface of the second connecting bracket with the end of the second connecting bracket mounting hole of the main housing, and fit the second mounting surface of the second connecting bracket with the bolt hole end of the second hydraulic pump; respectively pass bolts through the first mounting surface of the second connecting bracket and the first connecting bracket mounting hole of the main housing, and through the second mounting surface of the second connecting bracket and the bolt hole of the second hydraulic pump, so that the second connecting bracket fixes the pump connection end of the second motor pump assembly to the main housing; 6) Install the controller PCB board into the main chamber of the main housing, connect the three-phase wires with the first motor and the second motor through wires, and connect the high and low voltage connectors to the controller PCB board through wires; 7) Assemble the upper cover and seal to complete the assembly.

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