A pump body employing a cycloidal gear

Abstract

The utility model discloses a pump body adopts swing cycloid gear, including pump head, be provided with the oil inlet channel of one end and pump head left side outer intercommunication and the oil outlet channel of one end and pump head right side outer intercommunication in the pump head, the lower extreme of pump head is provided with swing cycloid gear assembly, the other end of oil inlet channel and the other end of oil outlet channel are communicated through swing cycloid gear assembly, the end of oil inlet channel is equipped with the oil inlet nozzle, and the end of oil outlet channel is equipped with the oil outlet nozzle, the pump body sets up in the upper end of motor assembly, be provided with the motor rotor subassembly for driving swing cycloid gear assembly work in the motor assembly. Adopt swing cycloid gear assembly to replace the impeller subassembly in prior art, because the structural strength of swing cycloid gear assembly is higher, can satisfy the high fuel pressure and big flow requirement required by large heavy truck.

Description

Technical Field

[0001] This utility model belongs to the technical field of automotive fuel supply systems, specifically relating to a pump body employing a cycloidal gear. Background Technology

[0002] In the prior art, a typical structure of a fuel pump includes a motor part and a pump body part. The motor part consists of a stator (permanent magnet and carbon brush), a rotor (commutator and armature winding) and a power supply. The pump body part is assembled with an impeller, an inlet end cover and an outlet end cover to form a pump chamber. Then, the motor shaft drives the impeller to rotate to achieve the output of fuel medium pressure.

[0003] The above structure is usually placed inside the fuel tank and is suitable for low-power fuel pumps, that is, power within 150W, pressure within 550KPa, and flow rate within 200L / h. It cannot meet the high fuel pressure and large flow requirements of large heavy trucks (pressure exceeding 600KPa, flow rate within 500L / h, and motor power within 300W). Utility Model Content

[0004] This utility model proposes a pump body using a cycloidal gear, which, when installed on the motor assembly of a fuel pump, can meet the high fuel pressure and large flow requirements of large heavy trucks.

[0005] Therefore, the technical solution adopted by this utility model is as follows: a pump body using a cycloidal gear, including a pump head, wherein the pump head is provided with an oil inlet channel with one end connected to the left side of the pump head and an oil outlet channel with one end connected to the right side of the pump head, a cycloidal gear assembly is provided at the lower end of the pump head, the other end of the oil inlet channel and the other end of the oil outlet channel are connected through the cycloidal gear assembly, an oil inlet nozzle is provided at the end of the oil inlet channel, and an oil outlet nozzle is provided at the end of the oil outlet channel, the pump body is located at the upper end of the motor assembly, and a motor rotor assembly for driving the cycloidal gear assembly is provided inside the motor assembly.

[0006] As a preferred embodiment of the above scheme, the cycloidal gear assembly includes a cycloidal gear sleeved on the upper end of the motor rotor assembly. The cycloidal gear is embedded in the gear fixing sleeve through a gear sleeve. The upper and lower ends of the gear fixing sleeve are respectively provided with an upper gear cover plate and a lower gear cover plate for sealing the cycloidal gear. The upper gear cover plate is provided with a connecting hole at the position corresponding to the oil inlet channel and the oil outlet channel.

[0007] In a further preferred embodiment, the pump head is also provided with an oil drain hole that communicates with the oil outlet channel, the oil drain hole is provided with a safety valve, and an oil drain nozzle is provided on the pump head corresponding to the outside of the oil drain hole.

[0008] In a further preferred embodiment, an oil separator sleeve is provided between the motor rotor assembly and the motor stator assembly, and a connecting disc is provided between the pump head and the motor assembly.

[0009] In a further preferred embodiment, the motor stator assembly includes a stator core, and stator assemblies with windings are provided at both the upper and lower ends of the stator core.

[0010] More preferably, the motor rotor assembly includes a motor shaft and a rotor assembly disposed outside the motor shaft.

[0011] The beneficial effects of this utility model are: replacing the impeller assembly in the prior art with a cycloidal gear assembly, which has higher structural strength and can therefore meet the high fuel pressure and large flow requirements of large heavy trucks. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the present invention (the arrows in the diagram indicate the direction of medium flow).

[0013] Reference numerals in the attached diagram: Motor housing-1, Pump head-2, Oil inlet-3, Oil outlet-4, Cycloidal gear-5, Gear sleeve-6, Gear retaining sleeve-7, Upper gear cover plate-8, Lower gear cover plate-9, Motor shaft-10, Oil separator sleeve-11, Lower bearing-12, Connecting disc-13, Upper bearing-14, Safety valve-15, Oil drain nozzle-16, Controller-17, Insulation board-18, Rear cover-19, Junction box-20, Thermally conductive fixing adhesive-21, Stator assembly-22, Stator core-23, Rotor assembly-25. Detailed Implementation

[0014] The present invention will be further described below with reference to embodiments and accompanying drawings:

[0015] like Figure 1 As shown, a pump body using a cycloidal gear mainly consists of a pump head 2 and a cycloidal gear assembly. Inside the pump head 2, there is an oil inlet channel with one end connected to the left side of the pump head 2 and an oil outlet channel with one end connected to the right side of the pump head 2. A cycloidal gear assembly is provided at the lower end of the pump head 2, and the other end of the oil inlet channel and the other end of the oil outlet channel are connected through the cycloidal gear assembly. An oil inlet nozzle 3 connected to the output pipe of the oil tank is provided at the end of the oil inlet channel, and an oil outlet nozzle 4 connected to the oil inlet pipe of the powertrain is provided at the end of the oil outlet channel.

[0016] The entire pump body is located at the top of the motor assembly, and the motor assembly contains a motor rotor assembly for driving the cycloidal gear assembly. When the cycloidal gear assembly is working, the medium can flow from the oil inlet, through the oil inlet channel, the cycloidal gear assembly and the oil outlet channel, and then out of the oil outlet.

[0017] The cycloidal gear assembly includes a cycloidal gear 5 sleeved on the upper end of the motor rotor assembly. The cycloidal gear 5 is embedded in the gear fixing sleeve 7 through the gear sleeve 6. The upper and lower ends of the gear fixing sleeve 7 are respectively provided with an upper gear cover plate 8 and a lower gear cover plate 9 for sealing the cycloidal gear 5. At the same time, the upper gear cover plate 8 is provided with a connecting hole at the position corresponding to the oil inlet channel and the oil outlet channel.

[0018] To prevent pipe rupture in case of blockage in the oil outlet or oil pipeline, an oil drain hole connected to the oil outlet channel is provided inside the pump head 2, and a safety valve 15 is provided on the oil drain hole. An oil drain nozzle 16 connected to the return oil pipeline on the power assembly is provided on the pump head 2 corresponding to the oil drain hole. When the pressure of the medium in the oil outlet channel is greater than the set value, the safety valve will open, so that the medium returns to the return oil pipeline from the oil drain hole through the oil drain nozzle.

[0019] The motor assembly also includes a motor housing 1. Specifically, the pump head 2 is mounted on the upper end of the motor housing 1, and a motor stator assembly is disposed between the motor housing 1 and the motor rotor assembly. Specifically, the motor stator assembly includes a stator core 23, and stator assemblies 22 with windings are disposed at both the upper and lower ends of the stator core 23. The motor rotor assembly includes a motor shaft 10 and a rotor assembly 25 disposed outside the motor shaft 10.

[0020] An oil separator sleeve 11 is provided between the motor rotor assembly and the motor stator assembly, and a connecting plate 13 is provided between the pump head 2 and the motor assembly. To support the motor shaft, a lower bearing 12 for supporting the lower end of the motor shaft is embedded within the oil separator sleeve, and an upper bearing 14 for supporting the upper end of the motor shaft is embedded within the lower end of the connecting plate. The upper end of the connecting plate 13 has a mounting end face located between the pump head 2 and the motor housing 1. Through the cooperation of the oil separator sleeve and the connecting plate, the dry and wet separation of the motor rotor assembly and the motor stator assembly can be effectively achieved, thereby preventing the motor stator assembly from being wetted and corroded by the medium, and thus ensuring the service life of the fuel pump.

[0021] To facilitate the control of the motor assembly and ensure stable operation of the fuel pump, a controller assembly is installed at the lower end of the motor assembly. The control assembly includes a controller 17 located at the lower end of the motor housing 1, with an insulating plate 18 between the controller 17 and the motor housing 1. A rear cover 19 is provided on the motor housing 1 to house the controller 17. A wire-passing hole is provided on the motor housing 1 for the stator assembly wires to pass through. A junction box 20 is provided on the rear cover 19 for the wires and power lines to connect to the controller. The controller employs existing technology with functions such as information reception, information processing, and information transmission.

[0022] To facilitate controller heat dissipation, a mounting groove for installing the controller is provided at the rear end of the motor housing 1. Thermally conductive adhesive 21 is injected into the mounting groove. This adhesive not only transfers heat but also secures the wires or power cords located within the mounting groove. A heat dissipation structure is also provided on the rear cover 19, and both the motor housing 1 and the rear cover 19 are made of aluminum alloy. The controller's heat is transferred to the motor housing or rear cover via the thermally conductive adhesive. Since the fuel pump is installed outside the fuel tank, natural wind can dissipate heat from the motor housing and rear cover, thus ensuring the controller's heat dissipation.

[0023] During the assembly of the entire fuel pump, it is first assembled into several large components before being fully assembled as a whole. Specifically:

[0024] The safety valve, drain nozzle, inlet nozzle, and outlet nozzle are installed on the pump head to form a non-powered pump head assembly. The cycloidal gear assembly is assembled. The motor stator assembly is installed in the motor housing to form a motor housing assembly. The upper bearing is pressed onto the connecting plate to form a connecting plate assembly. The lower bearing is pressed onto the oil separator sleeve to form an oil separator sleeve assembly.

[0025] Then, the oil separator sleeve assembly is installed on the motor housing assembly, the motor rotor assembly is placed inside the oil separator sleeve assembly, and the lower end of the motor shaft is supported by the lower bearing. The connecting plate is then placed on the upper end of the motor shaft, and the upper end of the motor shaft is supported by the upper bearing. The cycloidal gear assembly is then installed on the upper end of the motor shaft, so that when the motor shaft rotates, the inner rotor in the cycloidal gear can rotate. Finally, the non-powered pump head assembly, the connecting plate assembly, and the motor housing assembly are fixed, thus completing the installation of the upper end of the motor.

[0026] Fix the controller to the lower end of the motor housing, with an insulating plate between the controller and the motor housing. Then fix the stator wiring to the controller. Next, fill the mounting groove with thermally conductive fixing adhesive. Then fix the controller's power cord and wires to the junction box, the junction box to the rear cover, and the rear cover to the motor housing. This completes the installation of the entire fuel pump.

Claims

1. A pump body employing a cycloidal gear, characterized in that: The pump head (2) is provided with an oil inlet channel that is connected to the left side of the pump head (2) and an oil outlet channel that is connected to the right side of the pump head (2). A cycloidal gear assembly is provided at the lower end of the pump head (2). The other end of the oil inlet channel and the other end of the oil outlet channel are connected through the cycloidal gear assembly. An oil inlet nozzle (3) is provided at the end of the oil inlet channel and an oil outlet nozzle (4) is provided at the end of the oil outlet channel. The pump body is located at the upper end of the motor assembly. A motor rotor assembly for driving the cycloidal gear assembly is provided inside the motor assembly.

2. The pump body employing a cycloidal gear as described in claim 1, characterized in that: The cycloidal gear assembly includes a cycloidal gear (5) sleeved on the upper end of the motor rotor assembly. The cycloidal gear (5) is embedded in the gear fixing sleeve (7) through a gear sleeve (6). The upper and lower ends of the gear fixing sleeve (7) are respectively provided with a gear upper cover plate (8) and a gear lower cover plate (9) for sealing the cycloidal gear (5). The gear upper cover plate (8) is provided with a connecting hole at the position corresponding to the oil inlet channel and the oil outlet channel.

3. The pump body employing a cycloidal gear as described in claim 1, characterized in that: The pump head (2) is also provided with an oil drain hole that communicates with the oil outlet channel. A safety valve (15) is provided on the oil drain hole, and an oil drain nozzle (16) is provided on the pump head (2) corresponding to the outside of the oil drain hole.

4. The pump body employing a cycloidal gear as described in claim 1, characterized in that: The motor assembly also includes a motor housing (1), the pump head (2) is installed on the upper end of the motor housing (1), and a motor stator assembly is provided between the motor housing (1) and the motor rotor assembly.

5. The pump body employing a cycloidal gear as described in claim 4, characterized in that: An oil separator sleeve (11) is provided between the motor rotor assembly and the motor stator assembly, and a connecting plate (13) is provided between the pump head (2) and the motor assembly.

6. The pump body employing a cycloidal gear as described in claim 4, characterized in that: The motor stator assembly includes a stator core (23), and stator assemblies (22) with windings are provided at both the upper and lower ends of the stator core (23).

7. The pump body employing a cycloidal gear as described in claim 4, characterized in that: The motor rotor assembly includes a motor shaft (10) and a rotor assembly (25) disposed outside the motor shaft (10).

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