CN206830248U - Cam of engine camshaft - Google Patents
Cam of engine camshaft Download PDFInfo
- Publication number
- CN206830248U CN206830248U CN201720407652.6U CN201720407652U CN206830248U CN 206830248 U CN206830248 U CN 206830248U CN 201720407652 U CN201720407652 U CN 201720407652U CN 206830248 U CN206830248 U CN 206830248U
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- Prior art keywords
- cam
- basic circle
- lift
- circle
- interior
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- Expired - Fee Related
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- Valve Device For Special Equipments (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
Abstract
The utility model discloses a kind of cam of engine camshaft, the basic circle portion of the cam of engine camshaft is made up of interior basic circle portion and outer basic circle portion, and the molded line of the cam of engine camshaft includes：Base circle portion in first；The First Transition part of the interior outside basic circle of basic circle；Second transition portion of the interior outside basic circle of basic circle；The main lift area of exhaust valve, the main lift area include：First outer base circle portion；Main lift part；And the second outer base circle portion；The First Transition part of the outer inside basic circle of basic circle；Second transition portion of the outer inside basic circle of basic circle；And base circle portion in second.The cam profile of cylinder inside brake state cam profile and non-brake state is integrated into above a cam profile by the cam of engine camshaft, without individually designed brake cam so that the mechanism of whole camshaft is simpler compact.
Description
Technical field
Camshaft field is the utility model is related to, more particularly to a kind of cam of engine camshaft.
Background technology
At present, large-scale vehicle generally uses engine cylinder inside brake technology, and the technology can when can guarantee that vehicle descending
Reasonable regulation speed, effective braking action is played, can effectively shorten braking distance, wheel braking load can be mitigated, avoided
Wheel drag inordinate wear causes failure.
During engine cylinder inside brake, conventional cam shaft molded line only has a basic circle, can only be implemented separately cylinder inside brake or
A kind of non-distribution of mode of operation of cylinder inside brake, an individually designed brake cam is generally also needed to, and the brake cam needs
A series of extra mechanisms such as brake, brake cam, brake rocker arm are wanted to push exhaust valve open to coordinate.These mechanisms take cylinder cap
The space of top surface, the arrangement of other mechanisms is influenceed, add engine manufacture difficulty and cost.
The information for being disclosed in the background section is merely intended to increase the understanding to general background of the present utility model, and
It is not construed as recognizing or implies that the information structure has been existing well known to persons skilled in the art in any form
Technology.
Utility model content
The purpose of this utility model is to provide a kind of cam of engine camshaft, by cylinder inside brake state cam profile and
The cam profile of non-brake state is integrated into above a cam profile, without individually designed brake cam so that whole cam
The mechanism of axle is simpler compact.
To achieve the above object, the utility model provides a kind of cam of engine camshaft, the engine cam crown of roll
The basic circle portion of wheel is made up of interior basic circle portion and outer basic circle portion, and the molded line of the cam of engine camshaft includes：Basic circle portion in first
Point, cam angle is 0 °~3 °, cam lift 0mm；The First Transition part of the interior outside basic circle of basic circle, cam angle be 4 °~
19 °, cam is 0.96636mm relative to interior basic circle maximum lift；Second transition portion of the interior outside basic circle of basic circle, cam angle
For 19 °~54 °, cam is 2.6mm relative to outer basic circle maximum lift；The main lift area of exhaust valve, the main lift area bag
Include：First outer base circle portion, cam angle are 55 °~59 °, and cam is 0mm relative to outer basic circle lift, and cam is relative to interior base
Circle lift is 2.6mm；Main lift part, cam angle are 59 °~229 °, and cam is relative to outer basic circle maximum lift
9.90004mm；And the second outer base circle portion, cam angle are 230 °~236 °, cam is 0mm relative to outer basic circle lift,
Cam is 2.6mm relative to interior basic circle lift；The First Transition part of the outer inside basic circle of basic circle, cam angle be 237 °~
276 °, cam is 0.678319mm relative to the maximum lift of interior basic circle；Second transition portion of the outer inside basic circle of basic circle, cam
Corner is 277 °~288 °, and cam is reduced to 0mm relative to interior basic circle lift from 2.6mm；And base circle portion in second, cam
Corner is 289 °~360 °, cam lift 0mm.
Preferably, the base radius in interior basic circle portion and the outer basic circle portion is respectively 16.5mm and 19.1mm.
Compared with prior art, the utility model has the advantages that：By cylinder inside brake state cam profile and non-
The cam profile of on-position is integrated into above a cam profile, so without individually designed brake cam so that whole convex
The mechanism of wheel shaft is simpler compact, with rocking arm hydraulic part come instead of the actuator of original brake cam, oil pocket space is smaller, rings
Answer speed faster, reduce the use of related components such as brake, brake rocker arm, reduce design difficulty, reduce cylinder cap
Area occupied, eventually reduce design cost.
Brief description of the drawings
Fig. 1 is according to the cam angle θ of cam of engine camshaft of the present utility model and the graph of a relation of cam lift；
Fig. 2 is the molded line part charge schematic diagram according to cam of engine camshaft of the present utility model.
Embodiment
Below in conjunction with the accompanying drawings, specific embodiment of the present utility model is described in detail, it is to be understood that this practicality
New protection domain is not limited by embodiment.
Explicitly indicated that unless otherwise other, otherwise in entire disclosure and claims, term " comprising " or its change
Change such as "comprising" or " including " etc. and will be understood to comprise stated element or part, and do not exclude other members
Part or other parts.
As shown in Figure 1 to Figure 2, according to a kind of cam of engine camshaft of the utility model embodiment, the hair
The basic circle portion of the motivation cam of camshaft is made up of interior basic circle portion and outer basic circle portion, and the Profile Design of the cam of engine camshaft is such as
Under：
Base circle portion G~A in first, cam angle are 0 °~3 °, and cam lift 0mm, in the part, tappet is in interior base
Above, hydraulic tappet is oil-filled for circle, and plunger stretches out certain height, but because the difference gap of inside and outside basic circle, braking valve can not
Open, remain closing.
First Transition part A~B of the interior outside basic circle of basic circle, cam angle be 4 °~19 °, cam relative to interior basic circle most
High-lift is 0.96636mm, and in this region, fluid power rocking arm inner chamber is oil-filled state, and gate gurgle valve is closed, and plunger keeps stretching out shape
State, withstands the valve stem of cylinder inside brake valve, and cylinder inside brake valve is slowly opened.
Second transition portion B~C of the interior outside basic circle of basic circle, cam angle are 19 °~54 °, and cam is relative to outer basic circle
Maximum lift is 2.6mm, and in this region, fluid power rocking arm inner chamber starts draining, plunger return, valve slowly closing, when having arrived C
Carve, valve completely closes.
Main lift area C~D of exhaust valve, valve clearance adjust herein, and in the part, tappet driven member is on outer basic circle
Face pushes valve open by camshaft direct drive, and distribution effect, valve-closing at the time of D points is exhausted.The main lift area
Domain includes：First outer base circle portion, main lift part and the second outer base circle portion, wherein the cam of the first outer base circle portion turns
Angle is 55 °~59 °, and cam is 0mm relative to outer basic circle lift, and cam is 2.6mm relative to interior basic circle lift.Main lift part
Cam angle be 59 °~229 °, cam is 9.90004mm relative to outer basic circle maximum lift, when cam lift passes through rocking arm
Lift after amplification exceedes valve clearance, and rocking arm side promotes air valve bridge to cause braking valve and non-brake valve while open,
After completing exhaust distribution, valve is closed.The cam angle of second outer base circle portion is 230 °~236 °, and cam is relative to outer basic circle
Lift is 0mm, and cam is 2.6mm relative to interior basic circle lift.
First Transition part D~E of the outer inside basic circle of basic circle, cam angle are 237 °~276 °, and cam is relative to interior base
Round maximum lift is 0.678319mm, in the part, because the oil of oil pocket inside hydraulic tappet has all been let out, and plunger withdrawal,
The exhaust valve in this region that camshaft turns over is not opened.
Second transition portion E~F of the outer inside basic circle of basic circle, cam angle are 277 °~288 °, and cam is relative to interior base
Circle lift is reduced to 0mm from 2.6mm, and in the part, gate gurgle valve is closed above rocking arm, and no longer oil-feed, cam turns over this region,
Valve is also no longer opened.
Base circle portion F~G in second, cam angle are 289 °~360 °, cam lift 0mm.Interior base circle portion includes
Base circle portion F~G in base circle portion G~A and second in first, cam go to this region, and hydraulic tappet starts oil-feed, plunger
Slowly stretch out certain length under hydraulic action, but due to inside and outside presence basic circle it is poor, it is poor that elongation is less than inside and outside basic circle,
It is not enough to open valve, this period exhaust valve is to close.
Following table is the cam angle θ and cam lift corresponding relation of the cam profile：
As a kind of preferred embodiment, the base radius in interior basic circle portion and outer basic circle portion can be respectively 16.5mm and
19.1mm。
In such scheme, the cam with above-mentioned Profile Design is mainly used in the engine cylinder inside brake of double valve,
The exhaust molded line of two kinds of working conditions when a cam profile includes cylinder inside brake molded line and engine work.This is convex
Basic circle portion and outer basic circle portion are formed in the basic circle portion of wheel, and outer basic circle portion is the basic circle of exhaust main lift, and central transition section is row
The cam lift of valve opening valve during gas braking operation.When cylinder inside brake works, the brake actuator piston on exhaust rocker arm exists
Slowly stretch out or retract under the driving of rocking arm oil pressure fluid power, promote air valve bridge to open valve, closed with reaching control valve opening
The purpose closed.According to the technical program, the unlatching of exhaust valve when exhaust cam can control cylinder inside brake and non-cylinder inside brake, simultaneously
The drive mechanism of cylinder inside brake can be integrated on exhaust rocker arm, be not required to the drive mechanism of additional designs independence, reduced and taken cylinder cap
The space of top surface, reduce manufacturing cost.
To sum up, the cam of engine camshaft of the present embodiment, by cylinder inside brake state cam profile and non-brake state
Cam profile is integrated into above a cam profile, so without individually designed brake cam so that the mechanism of whole camshaft
It is simpler compact, with rocking arm hydraulic part come instead of the actuator of original brake cam, oil pocket space is smaller, and response speed is more
It hurry up, reduce the use of related components such as brake, brake rocker arm, reduce design difficulty, reduce cylinder cap area occupied,
Eventually reduce design cost.
The foregoing description to specific illustrative embodiment of the present utility model is to illustrate and the purpose of illustration.These
Description is not wishing to for the utility model to be defined to disclosed precise forms, and it will be apparent that according to above-mentioned teaching, can carry out
It is many to change and change.The purpose of selecting and describing the exemplary embodiment is that explain certain principles of the present utility model
And its practical application, so that those skilled in the art can realize and utilize a variety of examples of the present utility model
Property embodiment and various chooses and changes.The scope of the utility model is intended to by claims and its waits similar shape
Formula is limited.
Claims (2)
- A kind of 1. cam of engine camshaft, it is characterised in that the basic circle portion of the cam of engine camshaft by interior basic circle portion and Outer basic circle portion is formed, and the molded line of the cam of engine camshaft includes：Base circle portion in first, cam angle are 0 °~3 °, cam lift 0mm；The First Transition part of the interior outside basic circle of basic circle, cam angle are 4 °~19 °, and cam is relative to interior basic circle maximum lift 0.96636mm；Second transition portion of the interior outside basic circle of basic circle, cam angle are 19 °~54 °, and cam is relative to outer basic circle maximum lift For 2.6mm；The main lift area of exhaust valve, the main lift area include：First outer base circle portion, cam angle are 55 °~59 °, and cam is 0mm relative to outer basic circle lift, and cam is relative to interior Basic circle lift is 2.6mm；Main lift part, cam angle are 59 °~229 °, and cam is 9.90004mm relative to outer basic circle maximum lift；AndSecond outer base circle portion, cam angle are 230 °~236 °, and cam is 0mm relative to outer basic circle lift, cam relative to Interior basic circle lift is 2.6mm；The First Transition part of the outer inside basic circle of basic circle, cam angle be 237 °~276 °, cam relative to interior basic circle maximum Lift is 0.678319mm；Second transition portion of the outer inside basic circle of basic circle, cam angle be 277 °~288 °, cam relative to interior basic circle lift from 2.6mm is reduced to 0mm；AndBase circle portion in second, cam angle are 289 °~360 °, cam lift 0mm.
- 2. cam of engine camshaft according to claim 1, it is characterised in that the interior basic circle portion and the outer basic circle The base radius in portion is respectively 16.5mm and 19.1mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720407652.6U CN206830248U (en) | 2017-04-18 | 2017-04-18 | Cam of engine camshaft |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720407652.6U CN206830248U (en) | 2017-04-18 | 2017-04-18 | Cam of engine camshaft |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206830248U true CN206830248U (en) | 2018-01-02 |
Family
ID=60767116
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720407652.6U Expired - Fee Related CN206830248U (en) | 2017-04-18 | 2017-04-18 | Cam of engine camshaft |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206830248U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107165690A (en) * | 2017-04-18 | 2017-09-15 | 广西玉柴机器股份有限公司 | Cam of engine camshaft |
| CN108266241A (en) * | 2018-02-07 | 2018-07-10 | 广西玉柴机器股份有限公司 | Increase the exhaust cam of the engine cam of braking power |
-
2017
- 2017-04-18 CN CN201720407652.6U patent/CN206830248U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107165690A (en) * | 2017-04-18 | 2017-09-15 | 广西玉柴机器股份有限公司 | Cam of engine camshaft |
| CN108266241A (en) * | 2018-02-07 | 2018-07-10 | 广西玉柴机器股份有限公司 | Increase the exhaust cam of the engine cam of braking power |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180102 Termination date: 20190418 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |