CN216045314U

CN216045314U - Timing belt wheel structure of fuel pump

Info

Publication number: CN216045314U
Application number: CN202122458095.XU
Authority: CN
Inventors: 程宇云; 许浩
Original assignee: Litens Automotive Suzhou Co ltd
Current assignee: Litens Automotive Suzhou Co ltd
Priority date: 2021-10-12
Filing date: 2021-10-12
Publication date: 2022-03-15
Anticipated expiration: 2031-10-12

Abstract

The utility model relates to a timing belt wheel structure of a fuel pump, which comprises a belt wheel body, wherein a first end of the belt wheel body is a circular wheel part, a second end of the belt wheel body is a toothed part, a driving hole is formed in the center of the belt wheel body, the maximum radius of at least one toothed part in the toothed part is a first toothed part, the minimum radius of at least one toothed part in the toothed part is a second toothed part, a plurality of third toothed parts are arranged between the first toothed part and the second toothed part, and the radii of the third toothed parts are gradually reduced according to the direction from the first toothed part to the second toothed part. The gear profile is changed from a circular shape to a non-circular shape, extra torque output is generated to the system by utilizing the switching between the first tooth form with the largest radius and the second tooth form with the smallest radius of the non-circular gear in the movement process, and torsional vibration generated by the oil pump can be neutralized or offset, so that the influence of the torsional vibration of the oil pump on the timing system is offset or weakened.

Description

Timing belt wheel structure of fuel pump

Technical Field

The utility model relates to the technical field of belt wheel production in the automobile industry, in particular to a timing belt wheel structure of a fuel pump.

Background

With the continuous development of science and technology, the living standard of people is continuously improved, and the requirements of general consumers on the performance of automobiles are higher and higher. The automobile engine is used as a core component of an automobile, the performance requirement of the automobile engine also needs to be continuously improved, how to ensure that the engine timing system can still run safely and reliably is a great test for automobile enterprises and suppliers. The engine fuel pump is used as an important subcomponent in an engine assembly, the improvement of the engine performance tends to increase the power torque of the fuel pump, the dynamic performance of a timing system is worse due to the excessive power torque, the torsional vibration generated during the operation of the fuel pump can be completely transmitted to the timing system by the design of the existing fuel pump belt wheel, the torsional vibration can be generated when the power torque of the fuel pump is continuously improved, the influence on the timing system is larger and larger, and the influence cannot be reduced by the design of the existing circular belt wheel.

Disclosure of Invention

The technical scheme to be solved by the utility model is to provide a fuel pump timing belt wheel structure capable of reducing the influence of torsional vibration of a fuel pump on a timing system.

The technical scheme adopted by the utility model for solving the technical problems is as follows: a timing belt wheel structure of a fuel pump comprises a belt wheel body, wherein a first end of the belt wheel body is a circular wheel part, a second end of the belt wheel body is a tooth-shaped part, a driving hole is formed in the center of the belt wheel body, the maximum radius of at least one tooth shape in the tooth-shaped part is a first tooth shape, the minimum radius of at least one tooth shape in the tooth-shaped part is a second tooth shape, a plurality of third tooth shapes are arranged between the first tooth shape and the second tooth shape, and the radii of the plurality of third tooth shapes are gradually reduced according to the direction from the first tooth shape to the second tooth shape.

Further specifically, the first tooth profiles are at least two and uniformly distributed, and the second tooth profiles are at least two and uniformly distributed.

More specifically, the number of the first tooth forms is consistent with that of the second tooth forms, and the first tooth forms and the second tooth forms are arranged at intervals.

More specifically, the number of the first tooth forms and the number of the second tooth forms are two, the two first tooth forms are arranged oppositely, and the two second tooth forms are arranged oppositely.

More specifically, a connecting line between the two first tooth profiles penetrates through the circle center to form a long axis, a connecting line between the two second tooth profiles penetrates through the circle center to form a short axis, and the long axis is perpendicular to the short axis.

More specifically, at least one key groove is formed in the driving hole.

More specifically, the connecting line of the top end of the tooth shape of the tooth-shaped part is an ellipse.

The utility model has the beneficial effects that: the gear profile is changed from a circular shape to a non-circular shape, extra torque output is generated to the system by utilizing the switching between the first tooth form with the largest radius and the second tooth form with the smallest radius of the non-circular gear in the movement process, and torsional vibration generated by the oil pump can be neutralized or offset, so that the influence of the torsional vibration of the oil pump on the timing system is offset or weakened.

Drawings

FIG. 1 is a schematic structural view of the present invention;

fig. 2 is a schematic structural diagram of the flip module of the present invention.

In the figure: 1. a circular wheel portion; 2. a tooth-shaped portion; 3. a drive aperture; 4. a keyway; 5. a drive shaft; 21. a first tooth form; 22. a second tooth form; 23. and a third tooth form.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art. In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

As shown in fig. 1 and 2, the fuel pump timing belt wheel structure includes a belt wheel body, a first end of the belt wheel body is a circular wheel part 1, a second end of the belt wheel body is a tooth-shaped part 2, the tooth-shaped part 2 is used for meshing with a tooth shape of a belt, a driving hole 3 is arranged at a central position of the belt wheel body, at least one tooth shape in the tooth-shaped part 2 has a largest radius and takes the tooth shape with the largest radius as a first tooth shape 21, at least one tooth shape in the tooth-shaped part 2 has a smallest radius and takes the tooth shape with the smallest radius as a second tooth shape 22, a plurality of third tooth shapes 23 are arranged between the first tooth shape 21 and the second tooth shape 22, the radii of the plurality of third tooth shapes 23 gradually decrease along a direction from the first tooth shape 21 to the second tooth shape 22, that is, the radius of the third tooth shapes 23 gradually decreases from the first tooth shape 21 to the second tooth shape 22 according to a certain rule until the second tooth shape 22 is reached, and the tooth crest connecting lines of a plurality of tooth forms form a smooth arc shape.

As a further embodiment of the solution, the first tooth profiles 21 are at least two and evenly distributed, and the second gear wheels 22 are at least two and evenly distributed; when the number of the first tooth profiles 21 is two, the two first tooth profiles 21 are symmetrically arranged, and when the number of the first tooth profiles 21 is three, the three first tooth profiles 21 are distributed at an angle of 120 degrees, and so on; the second tooth profiles 22 are arranged in the first tooth profiles 21 in a similar distribution, two second tooth profiles 22 are symmetrically arranged, three second tooth profiles 23 are distributed at an angle of 120 degrees, and so on.

As a further embodiment of the present disclosure, the number of the first tooth forms 21 is the same as that of the second tooth forms 22, and the first tooth forms 21 and the second tooth forms 22 are arranged alternately, and the third tooth form 23 is arranged between the first tooth form 21 and the second tooth form 22, that is, the first tooth form 21, the third tooth form 23, the second tooth form 22, the third tooth form 23, the first tooth form 21, the third tooth form 23, the second tooth form 22 … … and so on are arranged around the gear body in this order.

As a further embodiment of the present solution, the number of the first tooth profiles 21 and the number of the second tooth profiles 22 are two, the two first tooth profiles 21 are disposed oppositely, and the two second tooth profiles 22 are disposed oppositely, that is, the two first tooth profiles 21 are axisymmetric, and the two second gear profiles 22 are axisymmetric; furthermore, in the scheme, a connecting line between the two first tooth forms 21 penetrates through the circle center to form a long shaft b, a connecting line between the two second tooth forms 22 penetrates through the circle center to form a short shaft a, b is larger than a, and the long shaft b and the short shaft a are perpendicular to each other.

As a further embodiment of the present disclosure, a top end line of the tooth shape portion 2 is an ellipse, that is, a top end line of the first tooth shape 21, the second tooth shape 22, and the third tooth shape 23 is an ellipse, so that the motion stability of the pulley body can be further improved.

Based on the structure, the tooth-shaped part of the belt wheel body is designed to be a non-circular structure, the first tooth-shaped part 21 forms a long shaft b, the second tooth-shaped part 22 forms a short shaft a, and the belt wheel body generates extra torque output to a system through continuous switching of the long shaft b and the short shaft a in the operation process, so that the influence of torsional vibration of a fuel pump on the timing system is counteracted or weakened.

As a further embodiment of this scheme, set up at least one keyway 4 on the drive hole 3, this keyway 4 main objective makes the drive shaft 5 of fuel pump be connected with the band pulley body to drive the motion of band pulley body, when this keyway 4 is a plurality of (at least two), the equal evenly distributed of keyway can improve the pivoted stability of band pulley body.

In conclusion, 1, through the structural optimization of the belt wheel body and the continuous switching between the long shaft b and the short shaft a in the movement process, the functions of meshing with a belt and transmission of the belt wheel of the fuel pump are ensured, and the influence of the torque of the fuel pump on the dynamic performance of a timing system is reduced;

2. the design of the belt wheel body is not required to be greatly modified, and meanwhile, the mold is only required to be slightly modified.

3. During the assembly process, no additional assembly steps need to be added.

It is to be emphasized that: the above embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention in any way, and all simple modifications, equivalent changes and modifications made to the above embodiments according to the technical spirit of the present invention are within the scope of the technical solution of the present invention.

Claims

1. The fuel pump timing belt wheel structure comprises a belt wheel body, wherein a first end of the belt wheel body is a circular wheel part (1), a second end of the belt wheel body is a toothed part (2), and a driving hole (3) is formed in the center of the belt wheel body, and the fuel pump timing belt wheel structure is characterized in that the radius of at least one toothed part in the toothed part (2) is the largest as that of a first toothed part (21), the radius of at least one toothed part in the toothed part (2) is the smallest as that of a second toothed part (22), a plurality of third toothed parts (23) are arranged between the first toothed part (21) and the second toothed part (22), and the radii of the third toothed parts (23) are gradually reduced according to the directions from the first toothed part (21) to the second toothed part (22).

2. The fuel pump timing pulley arrangement according to claim 1, characterized in that the first toothing (21) is at least two and evenly distributed and the second toothing (22) is at least two and evenly distributed.

3. The fuel pump timing pulley structure according to claim 2, characterized in that the first tooth profiles (21) and the second tooth profiles (22) are identical in number, and the first tooth profiles (21) and the second tooth profiles (22) are arranged at intervals.

4. The fuel pump timing pulley structure according to claim 2, wherein the first tooth profile (21) and the second tooth profile (22) are both two, the two first tooth profiles (21) are arranged oppositely, and the two second tooth profiles (22) are arranged oppositely.

5. The fuel pump timing pulley structure according to claim 4, wherein a connecting line between the two first tooth profiles (21) passes through a center of the circle to form a long axis, a connecting line between the two second tooth profiles (22) passes through the center of the circle to form a short axis, and the long axis is perpendicular to the short axis.

6. The fuel pump timing pulley structure according to claim 1, wherein a tooth tip connecting line of the tooth-shaped portion (2) is an ellipse.

7. The fuel pump timing pulley arrangement according to claim 1, characterized in that at least one key slot (4) is provided on the drive bore (3).