CN111648890A

CN111648890A - High-rotating-speed large-flow oil supply pump assembly

Info

Publication number: CN111648890A
Application number: CN202010512764.4A
Authority: CN
Inventors: 张建明; 姬广存
Original assignee: Yingjia Power Technology Wuxi Co ltd
Current assignee: Yingjia Power Technology Wuxi Co ltd
Priority date: 2020-06-08
Filing date: 2020-06-08
Publication date: 2020-09-11

Abstract

The application discloses large-traffic fuel feed pump assembly of high rotational speed. This fuel feed pump assembly includes: the oil supply pump comprises an oil supply pump body, wherein a camshaft, a tappet part, a plunger matching part, an oil inlet valve part and an oil outlet valve assembly are arranged in the oil supply pump body, the camshaft is movably connected with the tappet part, a plunger sleeve mounting hole is formed between the oil supply pump body and the oil inlet valve part, and the oil outlet valve assembly is arranged on one side, far away from a plunger cavity, of the oil inlet valve part. The technical problem that an oil supply pump assembly with high rotating speed, large flow and medium-high pressure is lacked in the existing market is solved.

Description

High-rotating-speed large-flow oil supply pump assembly

Technical Field

The invention relates to the technical field of fuel common rails, in particular to a high-rotating-speed large-flow fuel feed pump assembly.

Background

Along with the gradual upgrade of emission regulations and the increasing aggravation of energy crisis, the requirement of an engine on a fuel system is increased day by day, in order to meet the performance indexes of the engine such as emission performance, economy, reliability and the like, the fuel injection system of the engine generally adopts an electric control high-pressure common rail system, high-pressure oil of the common rail injection system is established by a high-pressure oil supply pump, the high-pressure oil supply pump is a key component forming the common rail system, and the key performance indexes of the common rail system such as oil supply flow, matching of the rotating speed of the engine, oil pumping performance, reliability performance and the like directly determine the performance of the common.

The high-pressure oil supply pump is divided into two structural forms of an in-line pump and a rotor pump, the power range matched with the in-line pump is larger, and the engine adopts more in-line pumps. When the in-line high-pressure pump works, a gear train of an engine drives a cam shaft to rotate, and the cam shaft drives a plunger matching part to move up and down to realize the oil filling process and the oil pressing process of a plunger, so that high-pressure fuel oil is provided for a common rail system.

In a common rail system in the market at present, high-pressure fuel oil generated by a fuel supply pump is mainly supplied to a fuel injector for injection and pressure control, but with the progress and update of fuel injection technology, for example, in a dual-fuel high-pressure direct injection system, the high-pressure fuel oil generated by the fuel supply pump is also used for driving and adjusting other system products, so that the demand on the fuel supply flow of the fuel supply pump is great, and no fuel supply pump product capable of meeting the demand exists in the market at present. In the existing oil supply pump products in the market, the ratio of the rotating speed of the crankshaft of the engine to the rotating speed of the oil supply pump is generally 2:1, the transmission ratio of the engine can be changed for improving the space utilization rate and improving the oil supply efficiency of the oil supply pump in a new generation of engine, the ratio of the rotating speed of the crankshaft of the engine to the rotating speed of the oil supply pump is designed to be 1:1, 1:1.5 or even 1:2, and the rotating speed of the oil supply pump is greatly improved. The rated rotating speed of the in-line fuel supply pump is generally required to be within 2000rpm, and the current in-line pump cannot meet the requirements of a new generation of engines.

Aiming at the problem that an oil supply pump assembly with high rotating speed, large flow and medium-high pressure is lacked in the market in the related technology, an effective solution is not provided at present.

Disclosure of Invention

The main aim at of this application provides a large-traffic fuel feed pump assembly of high rotational speed to solve the problem that lacks a fuel feed pump assembly of high rotational speed, large-traffic, well high pressure in the existing market.

To achieve the above objects, according to one aspect of the present application, a high rotational speed high flow fuel feed pump assembly is provided.

According to the application, a high rotational speed large-traffic fuel feed pump assembly includes: the oil supply pump comprises an oil supply pump body, wherein a camshaft, a tappet part, a plunger matching part, an oil inlet valve part and an oil outlet valve assembly are arranged in the oil supply pump body, the camshaft is movably connected with the tappet part, a plunger sleeve mounting hole is formed between the oil supply pump body and the oil inlet valve part, and the oil outlet valve assembly is arranged on one side, far away from a plunger cavity, of the oil inlet valve part.

Further, the plunger and barrel assembly comprises: plunger and plunger bushing, the plunger outside is provided with the plunger bushing.

Furthermore, a plunger spring is arranged in the plunger sleeve mounting hole, and a spring upper seat is arranged on the upper side of the plunger spring.

Further, a steel wire check ring is arranged on the upper side of the spring upper seat.

Further, a lower spring seat is arranged on the lower side of the plunger spring.

Further, the delivery valve assembly comprises: the oil outlet valve seat is connected with the oil outlet valve joint, the oil outlet valve joint is internally provided with the oil outlet valve spring, the lower side of the oil outlet valve spring is provided with a steel ball, and the other end of the steel ball is connected with the oil outlet valve seat.

Furthermore, an oil outlet is also arranged in the oil outlet valve joint.

Furthermore, an oil delivery pump part, a fuel metering valve and an oil inlet are further arranged on the oil supply pump body, the oil delivery pump part is connected with the fuel metering valve, and the fuel metering valve is connected with the oil inlet.

Furthermore, the camshaft adopts a tangent convex arc cam type line structure design.

In the embodiment of the application, a cam shaft driving mode with a tangent convex arc cam type line structure is adopted, a plunger sleeve mounting hole is formed between the oil supply pump body and the oil inlet valve component through the movable connection of the cam shaft and the tappet component, and the oil outlet valve component is arranged on one side, far away from the plunger cavity, of the oil inlet valve component, so that the aim of component connection transmission is fulfilled, the technical effects of high rotating speed and large flow are achieved, and the technical problem that an oil supply pump assembly with high rotating speed, large flow and medium-high pressure is lacked in the current market is solved.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, serve to provide a further understanding of the application and to enable other features, objects, and advantages of the application to be more apparent. The drawings and their description illustrate the embodiments of the invention and do not limit it. In the drawings:

FIG. 1 is a schematic cross-sectional view of a high speed, high flow fuel feed pump assembly according to an embodiment of the present application;

FIG. 2 is a schematic diagram of a two-cylinder feed pump configuration for a high speed, high flow feed pump assembly according to an embodiment of the present application;

FIG. 3 is a dual-feed tangent convex cam profile for a high speed, high flow feed pump assembly according to an embodiment of the present application;

FIG. 4 is a tangential convex arc cam lift curve of a high speed, high flow feed pump assembly according to an embodiment of the present application;

FIG. 5 is a tangential convex arc cam up section speed profile of a high speed, high flow feed pump assembly according to an embodiment of the present application;

FIG. 6 is a tangential convex arc cam up section acceleration curve of a high speed, high flow feed pump assembly according to an embodiment of the present application;

FIG. 7 is a single feed tangent convex cam profile for a high speed, high flow feed pump assembly according to an embodiment of the present application;

FIG. 8 is a three supply tangent convex cam profile for a high speed, high flow feed pump assembly according to an embodiment of the present application.

Reference numerals:

1. a camshaft; 2. an oil supply pump body; 3. a tappet member; 4. a spring lower seat; 5. a plunger spring; 6. a plunger; 7. a plunger sleeve; 8. a spring upper seat; 9. a steel wire retainer ring; 10. an oil inlet valve member; 11. an oil outlet valve seat; 12. an oil outlet valve joint; 13. an outlet valve spring; 14. a steel ball; 15. an oil outlet; 16. a plunger cavity; 17. an oil inlet; 18. oil transfer pump components; 19. a fuel metering valve; 20. a cam cavity; 21. a plunger sleeve mounting hole; 22. a plunger and barrel assembly; 23. and an oil outlet valve component.

Detailed Description

In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. 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 application.

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the application described herein may be used. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

In this application, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings. These terms are used primarily to better describe the invention and its embodiments and are not intended to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation.

Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meanings of these terms in the present invention can be understood by those skilled in the art as appropriate.

Furthermore, the terms "mounted," "disposed," "provided," "connected," and "sleeved" are to be construed broadly. For example, it may be a fixed connection, a removable connection, or a unitary construction; can be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements or components. The specific meanings of the above terms in the present invention can be understood by those of ordinary skill in the art according to specific situations.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.

As shown in fig. 1-2, the present application relates to a high speed, high flow fuel feed pump assembly. This fuel feed pump assembly includes: the oil supply device comprises an oil supply pump body 2, wherein a camshaft 1, a tappet part 3, a plunger matching part 22, an oil inlet valve part 10 and an oil outlet valve assembly 23 are arranged in the oil supply pump body 2, the camshaft 1 is movably connected with the tappet part 3, a plunger sleeve mounting hole 21 is formed between the oil supply pump body 2 and the oil inlet valve part 10, and the oil outlet valve assembly 23 is arranged on one side, far away from a plunger cavity 16, of the oil inlet valve part 10.

Specifically, the oil supply pump body 2 is a pump body for providing power, and can realize the driving effect; the oil supply pump body 2 is internally provided with a camshaft 1, a tappet part 3, a plunger matching part 22, an oil inlet valve part 10 and an oil outlet valve assembly 23, the camshaft 1 is movably connected with the tappet part 3, the tappet part 3 is driven to act through the camshaft 1, and then the effect of driving other parts to act is achieved; a plunger sleeve mounting hole 21 is formed between the oil supply pump body 2 and the oil inlet valve component 10, and the plunger sleeve mounting hole 21 is arranged, so that the effect of matching with other components can be realized; the oil inlet valve component 10 is provided with an oil outlet valve component 23 on the side away from the plunger cavity 16, and a good oil outlet effect can be realized by the arrangement of the oil outlet valve component 23.

Camshaft 1 installs in the cam chamber 20 of the oil feed pump body 2, tappet part 3, plunger spring 5, spring lower seat 4, spring upper seat 8, steel wire retainer ring 9, plunger 6, install in the plunger bushing mounting hole 21 of the oil feed pump body 2 such as plunger bushing 7, steel wire retainer ring 9 uses special frock to install in the oil feed pump body 2, under the effect of plunger spring 5 spring force, spring upper seat 8 is compressed tightly on steel wire retainer ring 9, spring lower seat 4 and tappet part 3 compress tightly on camshaft 1's cam, the space between spring lower seat 4 and tappet part 3 is installed to plunger 6 lower extreme, plunger 6 can carry out the up-and-down motion along with tappet part 3. When the camshaft 1 rotates, the movable members such as the tappet member 3 and the plunger 6 reciprocate up and down.

The fuel pump part 18 sucks fuel from a fuel tank through a coarse filter, the pressurized fuel is delivered to a fuel metering valve 19 through a fine filter, and the fuel metering valve 19 precisely adjusts the delivery amount of the fuel according to signals of the control unit. The fuel metering valve 19 delivers the regulated fuel to the oil inlet 17.

When the cam of the camshaft 1 moves from the top dead center to the bottom dead center, the tappet component 3 moves downwards, the oil inlet valve component 10 is opened, fuel oil regulated by the fuel oil metering valve 19 is conveyed to the plunger cavity 16 through the oil inlet 17, the oil inlet hole of the plunger sleeve 7 and the oil inlet valve component 10, and the oil supply pump finishes primary oil filling.

When the cam of the camshaft 1 moves from the bottom dead center to the top dead center, the tappet component 3 moves upwards, the oil inlet valve component 10 is closed, oil pressure is quickly built in the plunger cavity 16, the steel ball 14 moves upwards under the action of the oil pressure, the oil outlet valve is opened, high-pressure oil is conveyed to the common rail system through the oil outlet 15, and the oil supply pump finishes primary oil pressing.

From the above description, it can be seen that the following technical effects are achieved by the present application:

Preferably, in this embodiment, the plunger and barrel assembly 22 includes: plunger 6 and plunger barrel 7, plunger barrel 7 is provided with outside plunger 6.

In the present embodiment, it is preferable that the plunger housing mounting hole 21 is provided with a plunger spring 5, and an upper spring seat 8 is provided on the upper side of the plunger spring 5.

In the present embodiment, a wire retainer 9 is preferably provided on the upper side of the spring upper seat 8.

Preferably, in the present embodiment, a lower spring seat 4 is provided below the plunger spring 5.

As preferable in the present embodiment, the delivery valve assembly 23 includes: the oil outlet valve comprises an oil outlet valve seat 11, an oil outlet valve joint 12 and an oil outlet valve spring 13, wherein the oil outlet valve seat 11 is connected with the oil outlet valve joint 12, the oil outlet valve spring 13 is arranged inside the oil outlet valve joint 12, a steel ball 14 is arranged on the lower side of the oil outlet valve spring 13, and the other end of the steel ball 14 is connected with the oil outlet valve seat 11.

Preferably, an oil outlet 15 is also provided in the oil outlet valve joint 12.

Preferably, the fuel supply pump body 2 is further provided with an oil delivery pump part 18, a fuel metering valve 19 and an oil inlet 17, the oil delivery pump part 18 is connected with the fuel metering valve 19, and the fuel metering valve 19 is connected with the oil inlet 17.

Preferably, the camshaft is designed in a tangent convex arc cam type line structure. Further, as shown in fig. 3, the cam adopts a double oil supply structure, that is, for each rotation of the oil supply pump, a single plunger completes 2 times of oil supply. R0 is a base circle radius, H is a maximum cam lift, alpha is a camshaft rotation angle, R1 is a slow acceleration section arc, R2 is a deceleration section arc, and R3 is a return section arc. In the section α 1 of the cam angle, the tappet member 3 moves along the base circle of the cam, and the upward movement speed of the tappet member 3 is 0. During the cam angle α 2, the tappet member 3 moves upward along a tangent line segment, and a rapid upward speed and acceleration can be generated. During the section α 3 of the cam rotation angle, the tappet member 3 moves upward along the slow acceleration section arc R1, and the acceleration of the upward movement decreases. In the section α 4 of the cam rotation angle, the tappet member 3 moves upward along the deceleration section arc R2, the acceleration of the tappet member 3 moves downward, the deceleration movement is performed, and the speed of the tappet member 3 is 0 when the maximum lift is reached. At this point, the tappet member 3 completes the movement from the bottom dead center to the top dead center, and the plunger 06 completes one oil supply. During the upward movement of the tappet element 03, the resulting lift, speed and acceleration trends are shown in fig. 4, 5 and 6, respectively. During the section α 5 of the cam angle, the tappet member 3 is accelerated downward along the arc R2 by the plunger spring 5 and the cam. In the section α 6 of the cam rotation angle, the acceleration of the tappet member 3 is upward, and performs deceleration movement, and when the cam rotation angle reaches the bottom dead center, the movement speed of the tappet member 03 is 0. At this point, the tappet member 3 moves from the top dead center to the bottom dead center, and one-time oil filling is completed.

As a preferred embodiment of the present invention, the tangent convex arc cam is designed such that the profile line segment from the bottom dead center to the top dead center, i.e., the profile line of the cam ascending segment, includes multiple profile line structural forms such as tangent line + two-segment arc, tangent line + multiple-segment arc, tangent line + arc + function, and the like.

As a preferred embodiment in the present invention, the profile from the top dead center to the bottom dead center, that is, the profile of the cam return segment, of the designed tangent convex arc cam includes multiple profile forms, such as two-segment arcs, multiple-segment arcs, and an arc + function.

As a preferred feature in this embodiment, the tangential convex arc cam profile design includes both a single oil supply cam structure and a three oil supply cam structure, as shown in fig. 7 and 8, the oil supply pump may select a corresponding cam structure according to different oil supply amount and rotation speed parameters of the oil supply pump.

As a preferable mode in this embodiment, the spring upper seat 8 includes a positioning pin for limiting, in addition to the limiting structure of the wire retainer ring 09.

In this embodiment, the preferable mode of limiting the upper spring seat 8 includes, in addition to the above-mentioned limitation of the wire retainer ring 09 and limitation of the positioning pin, a mode of providing a stepped hole in the plunger bushing mounting hole 21 and limiting the upper spring seat 8 through the stepped hole. Good matching effect can be realized.

The invention also has the following beneficial effects:

(1) the maximum working speed of the oil supply pump in the invention can reach 4000rpm, and the requirement of high transmission ratio of a new generation of engine can be met;

(2) the oil supply pump of the invention has the oil supply flow far larger than that of the common oil supply pump, and meets the requirements of multiple purposes of high-pressure fuel oil of a new generation of engine;

(3) according to the oil supply pump disclosed by the invention, the maximum oil supply pressure of the oil supply pump is 1000-1500 bar according to different plunger diameters, so that the requirement of a medium-high pressure oil supply pump is met;

(4) according to the invention, the tangent convex arc cam profile reduces the motion acceleration of the moving part, so that the oil supply pump meets the product requirement of high rotation speed;

(5) in the invention, the fuel oil delivery channel is reasonably arranged, the oil filling efficiency of the oil supply pump is high, and the product sealing performance is good;

(6) according to the invention, through the optimization of a local structure, the design and development of a high-rotating-speed and high-flow medium-high pressure oil supply pump are realized, partial parts and the whole structure of the original oil supply pump are inherited, and the development cost is reduced.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. The utility model provides a large-traffic fuel feed pump assembly of high rotational speed which characterized in that includes: the oil supply pump comprises an oil supply pump body, wherein a camshaft, a tappet part, a plunger matching part, an oil inlet valve part and an oil outlet valve assembly are arranged in the oil supply pump body, the camshaft is movably connected with the tappet part, a plunger sleeve mounting hole is formed between the oil supply pump body and the oil inlet valve part, and the oil outlet valve assembly is arranged on one side, far away from a plunger cavity, of the oil inlet valve part.

2. A high speed, high flow fuel feed pump assembly as claimed in claim 1, wherein said plunger and barrel assembly comprises: plunger and plunger bushing, the plunger outside is provided with the plunger bushing.

3. The assembly of claim 2, wherein a plunger spring is arranged in the plunger sleeve mounting hole, and an upper spring seat is arranged on the upper side of the plunger spring.

4. The assembly of claim 3, wherein a steel wire retainer ring is arranged on the upper side of the spring upper seat.

5. A high speed high flow feed pump assembly as claimed in claim 2, wherein said plunger spring is provided with a lower spring seat on the underside.

6. A high speed high flow feed pump assembly as claimed in claim 1, wherein said outlet valve assembly comprises: the oil outlet valve seat is connected with the oil outlet valve joint, the oil outlet valve joint is internally provided with the oil outlet valve spring, the lower side of the oil outlet valve spring is provided with a steel ball, and the other end of the steel ball is connected with the oil outlet valve seat.

7. The high-speed high-flow oil supply pump assembly according to claim 6, wherein an oil outlet is further arranged in the oil outlet valve joint.

8. The assembly as claimed in claim 1, wherein an oil delivery pump unit, a fuel metering valve and an oil inlet are further disposed on the oil supply pump body, the oil delivery pump unit is connected to the fuel metering valve, and the fuel metering valve is connected to the oil inlet.

9. The assembly of claim 1, wherein the camshaft is designed in a tangential convex arc cam type line structure.