CN106894929A - In-cylinder direct fuel-injection engine and its tappet - Google Patents
In-cylinder direct fuel-injection engine and its tappet Download PDFInfo
- Publication number
- CN106894929A CN106894929A CN201510954664.6A CN201510954664A CN106894929A CN 106894929 A CN106894929 A CN 106894929A CN 201510954664 A CN201510954664 A CN 201510954664A CN 106894929 A CN106894929 A CN 106894929A
- Authority
- CN
- China
- Prior art keywords
- tappet
- hole
- dynamic pressure
- fluid dynamic
- injection engine
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
- F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
- F02M59/10—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by the piston-drive
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
- F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
- F02M59/10—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by the piston-drive
- F02M59/102—Mechanical drive, e.g. tappets or cams
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
- F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
- F04B1/0404—Details or component parts
- F04B1/0421—Cylinders
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Fuel-Injection Apparatus (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
Abstract
A kind of in-cylinder direct fuel-injection engine and its tappet, tappet are used to be arranged between the cam of camshaft and the plunger of high pressure fuel pump, and axial one end of tappet is used in the through hole of the cylinder head for inserting in-cylinder direct fuel-injection engine, and tappet can move reciprocatingly in through hole；The outer peripheral face of axial one end is provided with some fluid dynamic pressure grooves, and fluid dynamic pressure groove is used to accommodate lubricating oil, and hole wall that can be with through hole in the presence of hydrodynamic effect when tappet moves reciprocatingly in through hole is separated.Technical scheme produces abrasion by setting some fluid dynamic pressure grooves to be reduced the noise produced by in-cylinder direct fuel-injection engine and be vibrated and avoid tappet using hydrodynamic effect, improves the reliability of tappet.
Description
Technical field
The present invention relates to the technical field of engines on vehicle, more particularly to a kind of in-cylinder direct fuel-injection engine
And its tappet.
Background technology
The mode that fuel oil is sprayed in engine is divided into two kinds of injection and in-cylinder direct-jet outside cylinder.Injection is exactly outside cylinder
Inject fuel into air intake duct, entered back into cylinder after mixing with air inlet.In-cylinder direct-jet is directly will
Fuel oil is spurted into cylinder.Because the injection fuel mode of in-cylinder direct-jet is to improving fuel economy, improving
Power output is all helpful, therefore, the vehicle using in-cylinder direct fuel-injection engine is more and more now.
The fuel injection system of in-cylinder direct fuel-injection engine is including high pressure fuel pump, by oil pipe and high pressure fuel
The connected oily rail of pump and the fuel injector being connected with oily rail.In-cylinder direct fuel-injection engine start after, fuel oil according to
It is secondary via high pressure fuel pump, oily rail, fuel injector to spray into cylinder.Wherein, the plunger in high pressure fuel pump
Can be moved reciprocatingly under the driving effect of tappet, for high pressure fuel pump provides power.Tappet is arranged on height
Between the plunger of compression ignition oil pump and the cam of camshaft, and axial one end insertion in-cylinder direct-jet of tappet starts
In the through hole of the cylinder head of machine.When in-cylinder direct fuel-injection engine starts, cam axle, actuated by cams tappet
Moved reciprocatingly in the through hole of cylinder head, tappet drives plunger to move reciprocatingly.
However, find in actual applications, in-cylinder direct fuel-injection engine can be produced when working larger noise and
Violent vibration, causes NVH (the Noise Vibration Harshness, noise, vibration, sound of vehicle
Vibration roughness) performance is good.
The content of the invention
The problem to be solved in the present invention is：Existing in-cylinder direct fuel-injection engine can produce larger noise when working
With violent vibration, cause the NVH performances of vehicle not good.
It is described the invention provides a kind of tappet for in-cylinder direct fuel-injection engine to solve the above problems
Tappet is used to be arranged between the cam of camshaft and the plunger of high pressure fuel pump, the axial direction one of the tappet
Hold in the through hole of the cylinder head for inserting in-cylinder direct fuel-injection engine, and the tappet can be in the through hole
Move reciprocatingly；The outer peripheral face of described axial one end is provided with some fluid dynamic pressure grooves, the fluid dynamic pressure groove
For accommodating lubricating oil, can be in hydrodynamic effect when the tappet moves reciprocatingly in the through hole
Hole wall under effect with the through hole is separated.
Alternatively, the side wall of the fluid dynamic pressure groove is not parallel with the depth direction of fluid dynamic pressure groove.
Alternatively, the fluid dynamic pressure groove is hemispherical.
Alternatively, some fluid dynamic pressure grooves along tappet circumferentially-spaced distribution.
Alternatively, the axial other end of the tappet is provided with rotatable roller, the roller be used for it is convex
The cam of wheel shaft offsets.
In addition, present invention also offers a kind of in-cylinder direct fuel-injection engine, including：It is provided with the cylinder head of through hole；
For the tappet being arranged between the cam of camshaft and the plunger of high pressure fuel pump, the axial direction of the tappet
Insert in the through hole one end；The periphery of described axial one end of the hole wall of the through hole and/or the tappet
Face is provided with some fluid dynamic pressure grooves, and the fluid dynamic pressure groove is used to accommodate lubricating oil, and the tappet is described
Hole wall that can be with the through hole in the presence of hydrodynamic effect when being moved reciprocatingly in through hole is separated.
Alternatively, the side wall of the fluid dynamic pressure groove is not parallel with the depth direction of fluid dynamic pressure groove.
Alternatively, the fluid dynamic pressure groove is hemispherical.
Alternatively, some fluid dynamic pressure grooves along tappet or through hole circumferentially-spaced distribution.
Alternatively, the axial other end of the tappet is provided with rotatable roller, the roller be used for it is convex
The cam of wheel shaft offsets.
Compared with prior art, technical scheme has advantages below：
Outer peripheral face or institute in axial one end of the through hole of the cylinder head of tappet insertion in-cylinder direct fuel-injection engine
State and some fluid dynamic pressure grooves are provided with the hole wall of through hole.Tappet is described after in-cylinder direct fuel-injection engine startup
Moved reciprocatingly in through hole, in the presence of hydrodynamic effect, the lubricating oil in fluid dynamic pressure groove is very
One layer of oil film is formed between the hole wall of post and the through hole, the oil film provides lubrication for both, and will very
Post is separated with the hole wall of the through hole, it is to avoid tappet strikes on the hole wall of the through hole, not only subtracts
Noise and vibration produced by small in-cylinder direct fuel-injection engine, and avoid tappet and produce abrasion, improve
The reliability of tappet.In addition, the oil film between the hole wall of tappet and the through hole also has damping function,
A part of vibration can be absorbed, so as to further reduce the noise produced by in-cylinder direct fuel-injection engine and shake
It is dynamic.
Brief description of the drawings
Fig. 1 is the stereogram of the tappet for in-cylinder direct fuel-injection engine in one embodiment of the present of invention；
Fig. 2 is the profile of the dynamic pressure groove of tappet upper fluid shown in Fig. 1.
Specific embodiment
As it was previously stated, existing in-cylinder direct fuel-injection engine can produce larger noise and violent vibration when working,
Cause the NVH performances of vehicle not good.
In-cylinder direct fuel-injection engine is an extremely complex mechanical assembly, and it includes many moving components, because
This, causes in-cylinder direct fuel-injection engine to produce the reason for noise and vibration to have a lot.And, many motion portions
Part is taken exercises in the inside of engine, cannot be observed in the outside of engine.Thus, finding out causes
In-cylinder direct fuel-injection engine produces noise and the true cause of vibration to there are many difficulties.
Applicant produces loud noise and play through numerous studies discovery when causing in-cylinder direct fuel-injection engine to work
The source of strong vibration is provided in the tappet between the cam of camshaft and the plunger of high pressure fuel pump.And,
Further research draws, is the reason for the tappet causes loud noise and high vibration：The periphery of tappet
Easily there is the problem of lack of lubrication between the hole wall of through hole on face and cylinder head, so that the tappet exists
When being moved reciprocatingly in the through hole, the tappet is easily struck on the hole wall of the through hole, so as to produce
Raw noise and vibration.Further, since the hole wall of through hole is because of lack of lubrication in the outer peripheral face of tappet and cylinder head
And directly contact, tappet is easily caused with the contact position of hole wall and produces abrasion, and then reduce tappet
Reliability.
In order to solve the above problems, the invention provides a kind of improved tappet or in-cylinder direct fuel-injection engine,
It is in the outer peripheral face of axial one end of the through hole of the cylinder head of tappet insertion in-cylinder direct fuel-injection engine or in institute
State and some fluid dynamic pressure grooves are provided with the hole wall of through hole, in-cylinder direct-jet is reduced with using hydrodynamic effect
Noise produced by engine and vibration and tappet is avoided to produce abrasion.
It is understandable to enable the above objects, features and advantages of the present invention to become apparent, below in conjunction with the accompanying drawings
Specific embodiment of the invention is described in detail.
A kind of in-cylinder direct fuel-injection engine is present embodiments provided, its cylinder head for including being provided with through hole, and
The tappet 1 for being arranged between the cam of camshaft and the plunger of high pressure fuel pump as shown in Figure 1, very
Axial one end of post 1 is inserted in the through hole, and tappet 1 can move reciprocatingly in the through hole, with
The plunger is driven to move reciprocatingly so as to for high pressure fuel pump provides power.
The outer peripheral face of the described axial one end in the through hole of the insertion cylinder head of tappet 1 is provided with some hydrodynamics
Groove 2, fluid dynamic pressure groove 2 is used to accommodate lubricating oil.When tappet 1 is static in the through hole of cylinder head, tappet
1 contacts with the hole wall of the through hole.Tappet 1 does back and forth in the through hole after in-cylinder direct fuel-injection engine starts
Motion, in the presence of hydrodynamic effect, lubricating oil in fluid dynamic pressure groove 2 tappet 1 with it is described
One layer of oil film is formed between the hole wall of through hole, the oil film provides lubrications for both, and by tappet 1 and institute
The hole wall for stating through hole is separated, it is to avoid tappet 1 strikes on the hole wall of the through hole, not only reduces
Noise and vibration produced by in-cylinder direct fuel-injection engine, and avoid the generation of tappet 1 abrasion, improve
The reliability of tappet.In addition, the oil film between the hole wall of tappet 1 and the through hole also has damping function,
A part of vibration can be absorbed, so as to further reduce the noise produced by in-cylinder direct fuel-injection engine and shake
It is dynamic.
As shown in Fig. 2 the side wall S of fluid dynamic pressure groove 2 (extends along the depth direction of fluid dynamic pressure groove
Surface) shape can directly affect the effect of hydrodynamic effect.Preferably, in the present embodiment, fluid
The side wall S of dynamic pressure groove 2 (i.e. side wall S is in non-perpendicular shape) not parallel with the depth direction of fluid dynamic pressure groove 2,
The depth direction of fluid dynamic pressure groove 2 is the radial direction of tappet 1, in the radial direction and tappet 1
Axis intersects vertically.Compared with the technical scheme that the side wall S of fluid dynamic pressure groove 2 is set to vertical configuration, tool
The fluid dynamic pressure groove 2 for having non-perpendicular shape side wall S is easier the shape between the hole wall of tappet 1 and the through hole
Into oil film, and the oil film can realize to more maximum probability that each position of tappet 1 can be with the hole of the through hole
Wall keeps the state for separating.In addition, the fluid dynamic pressure groove 2 with non-perpendicular shape side wall S is also easier to
Processing, and be difficult to form stress concentration in the position of bottom wall, improve the mechanical strength of tappet 1.
In a particular embodiment, fluid dynamic pressure groove 2 is hemispherical, now exerts oneself to squeeze using a spherical object
Pressing the outer peripheral face of tappet 1 can form hemispherical fluid dynamic pressure groove 2.In the alternative of the present embodiment, stream
Body dynamic pressure groove 2 is it can also be provided that the other shapes such as semielliptical shape, taper.It should be noted that, in this hair
In bright technical scheme, fluid dynamic pressure groove 2 could be arranged to arbitrary shape, and its shape should not be limited to
Given embodiment.
In the present embodiment, with continued reference to shown in Fig. 1, some fluid dynamic pressure grooves 2 along tappet 1 circumference
It is spaced apart so that when tappet 1 moves reciprocatingly, can be equal in each position of the outer peripheral face of tappet 1
Oil film can be formed, can keep separating with the hole wall of the through hole with each position for ensureing tappet 1.
In the present embodiment, the axial other end of tappet 1 is provided with rotatable roller 3, roller 3 be used for
The cam of camshaft is offseted, and this tappet 1 with roller 3 is referred to as into roller tappet.Should be noted
It is that in the technical scheme of invention, the type of tappet 1 should not be limited to roller tappet, and it can be
Any type.
In an alternative of the present embodiment, fluid dynamic pressure groove is not disposed on the outer peripheral face of tappet, but
It is arranged on the hole wall of the through hole of cylinder head.In another alternative of the present embodiment, the outer peripheral face of tappet
Fluid dynamic pressure groove is provided with the hole wall of through hole.Based on the present embodiment identical know-why, should
Two technical schemes of alternative can obtain the constructed effect mentioned by above-described embodiment, herein no longer
Repeat.When fluid dynamic pressure groove is arranged on the hole wall of the through hole of cylinder head, its shape and arrangement mode are joined
Above-described embodiment is examined, be will not be repeated here.When fluid dynamic pressure groove is arranged on tappet, its processing mode
Processing mode relative to the fluid dynamic pressure groove being arranged on cylinder head through hole is more easy.
Although present disclosure is as above, the present invention is not limited to this.Any those skilled in the art,
Without departing from the spirit and scope of the present invention, can make various changes or modifications, therefore guarantor of the invention
Shield scope should be defined by claim limited range.
Claims (10)
1. a kind of tappet for in-cylinder direct fuel-injection engine, the tappet is used to be arranged on the cam and height of camshaft
Between the plunger of compression ignition oil pump, axial one end of the tappet is used to insert the gas of in-cylinder direct fuel-injection engine
In the through hole of cylinder cap, and the tappet can move reciprocatingly in the through hole；
Characterized in that, the outer peripheral face of described axial one end is provided with some fluid dynamic pressure grooves, the fluid is moved
Indent is used to accommodate lubricating oil, can be imitated in hydrodynamic when the tappet moves reciprocatingly in the through hole
Separated with the hole wall of the through hole in the presence of answering.
2. tappet as claimed in claim 1, it is characterised in that the side wall of the fluid dynamic pressure groove is moved with fluid
The depth direction of indent is not parallel.
3. tappet as claimed in claim 2, it is characterised in that the fluid dynamic pressure groove is hemispherical.
4. tappet as claimed in claim 1, it is characterised in that some fluid dynamic pressure grooves along tappet week
To being spaced apart.
5. the tappet as described in any one of Claims 1-4, it is characterised in that the axial direction of the tappet is another
End is provided with rotatable roller, and the roller is used to be offseted with the cam of camshaft.
6. a kind of in-cylinder direct fuel-injection engine, including：
It is provided with the cylinder head of through hole；
For the tappet being arranged between the cam of camshaft and the plunger of high pressure fuel pump, the tappet
Insert in the through hole axial one end；
Characterized in that, the outer peripheral face of described axial one end of the hole wall of the through hole and/or the tappet sets
There are some fluid dynamic pressure grooves, the fluid dynamic pressure groove is used to accommodate lubricating oil, and the tappet is in the through hole
Hole wall that can be with the through hole in the presence of hydrodynamic effect when inside moving reciprocatingly is separated.
7. in-cylinder direct fuel-injection engine as claimed in claim 6, it is characterised in that the side of the fluid dynamic pressure groove
Wall is not parallel with the depth direction of fluid dynamic pressure groove.
8. in-cylinder direct fuel-injection engine as claimed in claim 7, it is characterised in that the fluid dynamic pressure groove is in half
It is spherical.
9. in-cylinder direct fuel-injection engine as claimed in claim 6, it is characterised in that some fluid dynamic pressure grooves
Along the circumferentially-spaced distribution of tappet or through hole.
10. the in-cylinder direct fuel-injection engine as described in any one of claim 6 to 9, it is characterised in that the tappet
The axial other end be provided with rotatable roller, the roller is used to be offseted with the cam of camshaft.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510954664.6A CN106894929A (en) | 2015-12-17 | 2015-12-17 | In-cylinder direct fuel-injection engine and its tappet |
| DE102016219583.2A DE102016219583A1 (en) | 2015-12-17 | 2016-10-10 | An engine with direct cylinder injection and its plunger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510954664.6A CN106894929A (en) | 2015-12-17 | 2015-12-17 | In-cylinder direct fuel-injection engine and its tappet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106894929A true CN106894929A (en) | 2017-06-27 |
Family
ID=58994651
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510954664.6A Pending CN106894929A (en) | 2015-12-17 | 2015-12-17 | In-cylinder direct fuel-injection engine and its tappet |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN106894929A (en) |
| DE (1) | DE102016219583A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019237346A1 (en) * | 2018-06-15 | 2019-12-19 | 舍弗勒技术股份两合公司 | Fuel pump tappet |
-
2015
- 2015-12-17 CN CN201510954664.6A patent/CN106894929A/en active Pending
-
2016
- 2016-10-10 DE DE102016219583.2A patent/DE102016219583A1/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019237346A1 (en) * | 2018-06-15 | 2019-12-19 | 舍弗勒技术股份两合公司 | Fuel pump tappet |
| CN111601964A (en) * | 2018-06-15 | 2020-08-28 | 舍弗勒技术股份两合公司 | Tappet for fuel pump |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102016219583A1 (en) | 2017-06-22 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20170627 |