Fuel pump for automobile diesel

Abstract

The utility model relates to a fuel pump for automobile diesel oil. The fuel pump comprises an oil inlet end cover, a connector, a gear inner rotor, a gear outer rotor, an oil outlet base, a machine shell and a transmission shaft. The oil outlet seat is fixedly installed in the machine shell, a cavity is formed in the oil outlet seat, the gear inner rotor is arranged in the gear outer rotor in a matched mode, the gear inner rotor and the gear outer rotor are installed in the cavity in a matched mode, the connector is rotationally matched with an installation limiting table in the cavity, and a flat hole is formed in the middle of the connector. The transmission shaft penetrates out of the machine shell through the installation shaft hole and is inserted into the flat hole, the connector is in transmission connection with the gear inner rotor, an oil outlet is formed in the oil outlet seat, the machine shell is fixedly covered with the oil inlet end cover, an oil inlet is formed in the oil inlet end cover, and the connector, the gear inner rotor and the gear outer rotor are rotationally matched between the oil inlet end cover and the oil outlet seat. According to the utility model, the number of independent parts is reduced, the assembly process is simplified, the assembly precision and the product reliability are improved, and the working noise is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile fuel pumps, in particular to a fuel pump used for automobile diesel. Background Art

[0002] In the modern automotive industry, the fuel pump is a crucial component of the engine's fuel supply system, and its performance directly impacts engine efficiency and stability. For diesel vehicles, fuel pumps must not only ensure a stable fuel supply but also meet stricter emission standards and higher fuel economy requirements. Traditional fuel pumps typically utilize a ball bearing structure and rely on multiple screws to secure the pump assembly. This design presents several major issues: Because traditional fuel pumps contain numerous independent components (such as the oil inlet cover, support ring, gear rotor, ball bearings, oil outlet seat, bearings, etc.), the assembly process is cumbersome, requiring multiple steps for installation and commissioning. Furthermore, assembly precision is difficult to control, resulting in significant performance fluctuations and high noise levels. Utility Model Content

[0003] The utility model provides a fuel pump for automobile diesel, which reduces the number of independent components, simplifies the assembly process, improves assembly accuracy and product reliability, reduces working noise, and solves the above-mentioned problems existing in the use process of the prior art.

[0004] The technical solution of the utility model is achieved as follows: a fuel pump for automobile diesel, comprising an oil inlet end cover, a connector, a gear inner rotor, a gear outer rotor, an oil outlet seat, a casing and a transmission shaft; the oil outlet seat is fixedly installed in the casing, a cavity is opened on the oil outlet seat, a mounting limit platform is integrally formed in the middle of the cavity of the oil outlet seat, a mounting shaft hole is opened on the mounting limit platform that passes through the oil outlet seat, the gear inner rotor is matched to be arranged in the gear outer rotor, the gear inner rotor and the gear outer rotor are matched to be mounted in the cavity, the connector is rotatably fitted on the mounting limit platform, a flat hole is opened in the middle of the connector, the transmission shaft passes through the mounting shaft hole from the casing and is inserted into the flat hole, the connector is transmission-connected to the gear inner rotor, the oil outlet seat is opened on one side of the cavity with an oil outlet, the oil inlet end cover is fixedly covered on the casing, the oil inlet end cover is opened on the oil inlet, the connector, the gear inner rotor and the gear outer rotor are rotatably fitted between the oil inlet end cover and the oil outlet seat.

[0005] Preferably, one side of the gear inner rotor and the gear outer rotor is attached to the bottom of the cavity of the oil outlet seat, and the other side is attached to the oil inlet end cover.

[0006] Preferably, the outer ring of the gear outer rotor is circular and fits against the inner wall of the cavity, a circular hole is opened in the middle of the gear inner rotor, and the inner wall of the circular hole fits against the outer wall of the mounting limit platform.

[0007] Preferably, a connector accommodating positioning groove for accommodating a connector is provided on the oil inlet end cover, and a supporting convex ring for abutting against the mounting limit platform is provided on the side of the connector facing the mounting limit platform.

[0008] Preferably, the gear inner rotor is provided with a plurality of slots on the circular hole, and the connector is provided with a card column corresponding to the slots.

[0009] Preferably, the oil inlet end cover and the oil outlet seat are both provided with oil grooves on the side facing the gear inner rotor and the gear outer rotor.

[0010] Preferably, the oil inlet end cover is provided with a filter installation interface in the oil inlet.

[0011] Preferably, the inner ring of the gear outer rotor is provided with an internal tooth profile divided into 10 equal parts, and the outer ring of the gear inner rotor is provided with a cycloid tooth profile divided into 9 equal parts, and the cycloid tooth profile of the gear inner rotor matches the internal tooth profile of the gear outer rotor.

[0012] In summary, the beneficial effects of the present invention are:

[0013] 1. Compared with the existing technology, the utility model reduces the number of some independent components, adopts an integrated design, simplifies the assembly process, and improves production efficiency. The gear inner rotor and the outer rotor are installed in the cavity, and the connector, the gear inner rotor and the gear outer rotor are rotatably matched between the oil inlet end cover and the oil outlet seat, ensuring transmission accuracy. At the same time, the connector is connected to the drive shaft through the flat hole, ensuring the reliability of power transmission.

[0014] 2. One side of the gear inner rotor and the gear outer rotor is attached to the bottom of the cavity of the oil outlet seat, and the other side is attached to the oil inlet end cover. The outer ring of the gear outer rotor is attached to the inner wall of the cavity, and the inner wall of the circular hole of the gear inner rotor is attached to the outer wall of the installation limit platform. This structure can help reduce vibration during operation, ensure the stability of the structural operation, and reduce the noise level. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0016] Figure 1 This is a schematic diagram of the explosion structure of the utility model located in an automobile fuel pump;

[0017] Figure 2 for Figure 1 A partial enlarged schematic diagram of the upper part;

[0018] Figure 3 for Figure 1 Schematic diagram of the cross-section structure;

[0019] Figure 4 This is a schematic diagram of the structure of the connector in the present utility model;

[0020] Figure 5 This is a schematic diagram of the structure of the gear inner rotor and the gear outer rotor in the present invention;

[0021] Figure 6 This is a structural diagram of the oil outlet seat in the utility model;

[0022] Figure 7 This is a schematic structural diagram of the oil inlet end cover in the utility model;

[0023] Figure 8 for Figure 7 Schematic diagram of the structure when observed from another angle;

[0024] Figure 9 This is a schematic structural diagram of the transmission shaft and drive motor of the utility model;

[0025] Figure 10 This is a schematic diagram of the overall structure of the utility model installed in an automobile fuel pump;

[0026] Figure 11 for Figure 10 Schematic diagram of the structure with the oil inlet cover removed.

[0027] In the figure: 1. Oil inlet end cover; 11. Oil inlet port; 12. Connector accommodating positioning groove; 13. Filter installation interface; 14. Oil cover positioning groove; 2. Connector; 21. Flat hole; 22. Abutting convex ring; 23. Clamping column; 3. Gear inner rotor; 31. Circular hole; 32. Clamping groove; 33. Cycloidal tooth profile; 4. Gear outer rotor; 41. Internal tooth profile; 5. Oil outlet seat; 51. Cavity; 52. Mounting limit platform; 53. Mounting shaft hole; 54. Oil outlet port; 55. Oil tank; 56. Positioning groove; 6. Casing; 61. Positioning boss; 62. Step limit surface; 7. Drive shaft. DETAILED DESCRIPTION

[0028] The following is a combination of the appended examples of the present invention Figure 1-11 , clearly and completely describes 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 them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0029] Example:

[0030] like Figures 1 to 11 As shown, the utility model discloses a fuel pump for automobile diesel, comprising an oil inlet end cover 1, a connector 2, a gear inner rotor 3, a gear outer rotor 4, an oil outlet seat 5, a casing 6 and a transmission shaft 7; wherein, the oil outlet seat 5 is fixedly installed in the casing 6, and a positioning groove 56 is provided on the oil outlet seat 5, and a positioning boss 61 is provided on the casing 6, the positioning groove 56 of the oil outlet seat 5 is aligned with the positioning boss 61 of the casing 6 and is pressed onto the step limit surface 62 in the casing 6, a cavity 51 is provided on the oil outlet seat 5, and the oil outlet seat 5 is integrally formed with a mounting limit platform 52 in the middle of the cavity 51, and a mounting shaft hole 53 passing through the oil outlet seat 5 is provided on the mounting limit platform 52, wherein the gear inner rotor 3 is cooperatively arranged in the gear outer rotor 4, and the gear inner rotor 3 and the gear outer rotor 4 are cooperatively installed in the cavity 51, and in addition, The connector 2 is rotatably fitted on the mounting limit platform 52. A flat hole 21 is provided in the middle of the connector 2, and the transmission shaft 7 passes through the mounting shaft hole 53 from the casing 6 and is inserted into the flat hole 21. The transmission shaft 7 is used to drive the connector 2 to rotate, and the connector 2 is transmission-connected to the gear inner rotor 3. The connector 2 is driven by the transmission shaft 7 and can be used to drive the gear inner rotor 3 to rotate. The oil outlet seat 5 is provided with an oil outlet 54 on one side of the cavity 51, and the oil inlet end cover 1 is fixedly covered on the casing 6. An oil cover positioning groove 14 for inserting the positioning boss 61 is also provided on the oil inlet end cover 1. An oil inlet 11 is provided on the oil inlet end cover 1. The oil inlet end cover 1 and the oil outlet seat 5 are pressed tightly by the casing 6. The connector 2, the gear inner rotor 3 and the gear outer rotor 4 are rotatably fitted between the oil inlet end cover 1 and the oil outlet seat 5.

[0031] To ensure the stability of the structure, the inner gear rotor 3 and the outer gear rotor 4 are attached to the bottom of the cavity 51 of the oil outlet seat 5 on one side and to the oil inlet cover 1 on the other side. Furthermore, the outer ring of the outer gear rotor 4 is circular and fits against the inner wall of the cavity 51. A circular hole 31 is provided in the center of the inner gear rotor 3, and the inner wall of the hole 31 fits against the outer wall of the mounting stop 52.

[0032] Furthermore, a connector accommodating positioning groove 12 for accommodating the connector 2 is provided on the oil inlet end cover 1, and a supporting convex ring 22 for abutting against the mounting limit platform 52 is provided on the side of the connector 2 facing the mounting limit platform 52, so as to reduce the friction between the connector 2 and the mounting limit platform 52 when the connector 2 rotates.

[0033] In this invention, the inner gear rotor 3 has five slots 32 defined in the circular hole 31, and the connector 2 has five latching posts 23 corresponding to the slots 32. Therefore, when the connector 2 is driven by the transmission shaft 7, it can drive the connector 2 to rotate. The connector 2 is loosely fitted to the transmission shaft 7 and the inner gear rotor 3. The rotation of the inner gear rotor 3 is stabilized by the mounting stop 52 of the oil outlet seat 5, reducing the impact of multiple parts on product precision, thereby lowering the precision of part manufacturing and reducing costs.

[0034] In order to facilitate lubrication of the gear inner rotor 3 and the gear outer rotor 4 , the oil inlet cover 1 and the oil outlet seat 5 are both provided with oil grooves 55 on the side facing the gear inner rotor 3 and the gear outer rotor 4 .

[0035] The oil inlet cover is provided with a filter installation interface 13 in the oil inlet port 11 for installing a filter assembly.

[0036] In the present utility model, in order to reduce the pressure pulsation generated by the rotation of the gears, the inner ring of the gear outer rotor 4 is provided with an internal tooth profile 41 divided into 10 equal parts, and the outer ring of the gear inner rotor 3 is provided with a cycloid tooth profile 33 divided into 9 equal parts. The cycloid tooth profile 33 of the gear inner rotor 3 cooperates with the internal tooth profile 41 of the gear outer rotor 4. When the gear inner rotor 3 is driven by the connector 2 and the gear outer rotor 4 rotates, the volume of the working chamber between the gear inner rotor 3 and the gear outer rotor 4 periodically increases and decreases, thereby achieving the suction of fuel from the oil inlet port 11 of the oil inlet end cover 1 and the discharge of high-pressure fuel through the oil outlet port 54 on the oil outlet seat 5 for supply to the engine.

[0037] It should also be noted that the oil outlet seat 5 is made of thermosetting plastic, requiring flatness ≤ 0.005mm, eccentricity within ±0.005mm, and concentricity ≤ 0.015mm; the gear inner rotor 3 is a powder metallurgy part; the gear outer rotor 4 is a powder metallurgy part, and the gear hardness is ≥ 85HRB, thereby improving the gear wear resistance and life; the connector 2 is plastic; and the oil inlet end cover is made of thermosetting plastic;

[0038] In order to ensure the dimensional stability and high flatness (0.005mm) of the oil inlet end cover 1, after the connector accommodating positioning groove 12 and the oil groove 55 are machined, the oil inlet end cover 1 is surface ground to improve the surface roughness after processing, reduce the friction between the inner and outer rotors of the gear and the oil inlet end cover 1, thereby improving the motor efficiency and reducing noise, thereby improving the motor performance and life. In addition, in order to ensure that the height difference between the gear inner rotor 3 and the gear outer rotor 4 does not exceed 0.005mm, during processing, the gear inner rotor 3 and the gear outer rotor 4 are combined and then surface ground to ensure dimensional stability.

[0039] After optimization, the motor efficiency can reach more than 25%, the noise level is ≤60db, and the life span is ≥3000 hours.

[0040] It should also be pointed out that the terms indicated in the present invention, such as: "front", "rear", "vertical", "horizontal", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as limiting the scope of protection of the present invention.

[0041] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A fuel pump for automobile diesel, characterized in that: The cam is fixedly mounted in the casing, and the oil outlet seat is provided with a cavity, and the oil outlet seat is integrally formed with a mounting limit platform in the middle of the cavity, and the mounting limit platform is provided with a mounting shaft hole that passes through the oil outlet seat, and the inner rotor of the gear is cooperated with the outer rotor of the gear and is mounted in the cavity, and the connector is rotatably fitted on the mounting limit platform, and a flat hole is provided in the middle of the connector, and the transmission shaft passes through the mounting shaft hole from the casing and is inserted into the flat hole, and the connector is transmission-connected with the inner rotor of the gear, and the oil outlet seat is provided with an oil outlet on one side of the cavity, and the oil inlet end cover is fixedly covered on the casing, and the oil inlet end cover is provided with an oil inlet, and the connector, the inner rotor of the gear and the outer rotor of the gear are rotatably fitted between the oil inlet end cover and the oil outlet seat.

2. A fuel pump for automotive diesel according to claim 1, characterized in that: One side of the gear inner rotor and the gear outer rotor is attached to the bottom of the cavity of the oil outlet seat, and the other side is attached to the oil inlet end cover.

3. A fuel pump for automotive diesel according to claim 2, characterized in that: The outer ring of the gear outer rotor is circular and fits against the inner wall of the cavity. A circular hole is opened in the middle of the gear inner rotor, and the inner wall of the circular hole fits against the outer wall of the mounting limit platform.

4. A fuel pump for automotive diesel according to claim 3, characterized in that: The oil inlet end cover is provided with a connector accommodating positioning groove for accommodating the connector, and the side of the connector facing the installation limit platform is provided with a supporting convex ring for abutting against the installation limit platform.

5. A fuel pump for automotive diesel according to claim 1, characterized in that: The gear inner rotor is provided with a plurality of slots on the circular hole, and the connector is provided with a card column correspondingly inserted into the slots.

6. A fuel pump for automotive diesel according to claim 1, characterized in that: The oil inlet end cover and the oil outlet seat are both provided with oil grooves on one side facing the gear inner rotor and the gear outer rotor.

7. A fuel pump for automotive diesel according to claim 1, characterized in that: The oil inlet end cover is provided with a filter installation interface in the oil inlet.

8. A fuel pump for automotive diesel according to claim 1, characterized in that: The inner ring of the gear outer rotor is provided with an internal tooth profile divided into 10 equal parts, and the outer ring of the gear inner rotor is provided with a cycloid tooth profile divided into 9 equal parts. The cycloid tooth profile of the gear inner rotor matches the internal tooth profile of the gear outer rotor.

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