CN207829965U - Increase the exhaust cam of the engine cam of braking power - Google Patents
Increase the exhaust cam of the engine cam of braking power Download PDFInfo
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- CN207829965U CN207829965U CN201820214768.2U CN201820214768U CN207829965U CN 207829965 U CN207829965 U CN 207829965U CN 201820214768 U CN201820214768 U CN 201820214768U CN 207829965 U CN207829965 U CN 207829965U
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Abstract
The utility model discloses a kind of exhaust cams for the engine cam increasing braking power, the basic circle portion of the exhaust cam is made of interior basic circle portion and outer basic circle portion, exhaust cam can master cylinder inside brake and when non-cylinder inside brake exhaust valve unlatching, the molded line of exhaust cam includes the exhaust molded line of two kinds of working conditions of engine cylinder inside brake pattern and normal running mode, and the molded line of exhaust cam includes：Interior base circle portion；Brake the parts CR；Brake the transition portion of the outside basic circle in the parts CR；The main lift part of exhaust valve；The outer inside basic circle transition portion of basic circle；Interior base circle portion；And BGR sections of braking.The exhaust cam of the utility model uses the double brake small peak of CR small peaks and BGR small peaks, significantly improves braking power；First there is one section to keep lift constant after CR sections of braking valves are opened, then be transitioned into main lift section, to effectively reduce the abrasion of valve and seat ring.
Description
Technical field
It is the utility model is related to camshaft field, more particularly to a kind of for increasing the engine cam of braking power
Exhaust cam.
Background technology
Large-scale vehicle generally uses engine cylinder inside brake technology, the technology to can guarantee and can be closed when vehicle descending at present
Regulation speed is managed, plays effective braking action, and can effectively shorten braking distance, while wheel braking load can be mitigated,
Wheel drag inordinate wear is avoided to cause failure.Cylinder inside brake scheme is divided from principle：It is vented butterfly valve, deflation type
Braking, compression release braking.Wherein, compression release braking power is higher than the above two.
Compression release braking is divided into integrate two kinds of structure types of rocking arm and independent rocking arm, since integrated rocking arm can reduce cloth
Between emptying and number of parts, engine cylinder inside brake is used gradually to develop into integrated form rocking arm by free-standing brake rocker arm, to
It is effectively simplified camshaft design and its design of associated driver so that whole system is simpler compact, but integrated form shakes
Arm braking power is limited, cannot be satisfied the requirement of the big braking power of some vehicles.Therefore, current integrated form cylinder inside brake cam
Axis only generates braking power by single braking small peak, and braking power is smaller, cannot meet the requirement of the big braking power of some vehicles.
The information for being disclosed in the background technology part is merely intended to increase the understanding to the general background of the utility model, and
It is not construed as recognizing or implying in any form that information composition has been existing well known to persons skilled in the art
Technology.
Utility model content
The purpose of this utility model is to provide a kind of exhaust cams for the engine cam increasing braking power, thus
The brake camshaft of the prior art is overcome only to be lacked by braking power is smaller caused by single braking small peak generation braking power
Point.
To achieve the above object, it is convex to provide a kind of exhaust for the engine cam increasing braking power for the utility model
Wheel, the basic circle portion of the exhaust cam are made of interior basic circle portion and outer basic circle portion, and exhaust cam coordinates with tappet, and exhaust cam can
The unlatching of exhaust valve when master cylinder inside brake and non-cylinder inside brake, the molded line of exhaust cam include engine cylinder inside brake pattern and
The exhaust molded line of two kinds of working conditions of normal running mode, the molded line of exhaust cam include：Interior base circle portion, when exhaust cam turns
When to interior base circle portion region, exhaust valve and braking valve are in off state；The parts CR are braked, when exhaust cam goes to braking
When the subregions CR, tappet rises, and brake piston drives braking valve to open, and exhaust valve is still in off state；Brake the parts CR
The transition portion of outside basic circle, is the changeover portion before exhauxt valve opens, and braking valve is kept it turned on；The main liter of exhaust valve
Journey part, exhaust valve and braking valve are opened, distribution is exhausted, before the main lift part of exhaust valve is terminated, and exhaust
Door is closed；The outer inside basic circle transition portion of basic circle, before the inside basic circle transition portion of outer basic circle terminates, braking valve is lived in braking
It is closed under the driving of plug, exhaust valve remains off；Interior base circle portion, when cam goes to the braking subregions CR, exhaust
Door and braking valve are in off state；And BGR sections of braking, when cam, which is gone to, brakes BGR sections, tappet rises, and braking is lived
Plug driving braking valve is opened, and exhaust valve is still in off state.
Preferably, in above-mentioned technical proposal, the driving mechanism of cylinder inside brake is integrated on exhaust rocker arm so that is made in cylinder
When dynamic model formula, the brake piston on exhaust rocker arm can be stretched out or be retracted, to control being turned on and off for braking valve.
Preferably, in above-mentioned technical proposal, braking power is provided by CR small peaks and BGR small peak two parts.
Preferably, in above-mentioned technical proposal, the cam angle of interior base circle portion is 221 °~239 °, cam lift 0mm；
The cam angle for braking the parts CR is 344 °~360 ° and 1 °~49 °, and exhaust cam is relative to interior basic circle maximum lift
2.46565714mm；Brake CR part outward basic circle transition portion cam angle be 50 °~63 °, exhaust cam relative to
Interior basic circle maximum lift is 2.74120208mm；The cam angle of the main lift part of exhaust valve is 64 °~187 °, exhaust cam
It is 10.34042959mm relative to interior basic circle maximum lift；The cam angle of the outer inside basic circle transition portion of basic circle be 188 °~
220 °, exhaust cam is 2.79067381mm relative to the maximum lift of interior basic circle；The cam angle of interior base circle portion is 221 °
~239 °, cam lift 0mm；And the cam angle of BGR sections of braking is 240 °~288 °, exhaust cam is relative to interior basic circle
Maximum lift be 1.86103969mm.
Compared with prior art, the utility model has the advantages that：
(1) cam profile of the cam profile of cylinder inside brake state and non-cylinder inside brake state is integrated into a cam type
On line, so that entire camshaft mechanism is compacter, reduces number of parts, reduce cost；
(2) double brake small peak is used, i.e. braking power is small by CR (compression discharges) small peaks and BGR (recycling of braking gas)
Peak two parts provide, so as to significantly improve braking power；
(3) first there is one section to keep lift constant after CR sections of braking valves are opened, then be transitioned into main lift section, valve does not have to
Main lift section is opened again after first taking a seat, and can effectively reduce the abrasion of valve and seat ring；
(4) due to the unlatching of exhaust valve when exhaust cam can control cylinder inside brake and non-cylinder inside brake, while cylinder inside brake
Driving mechanism can be integrated on exhaust rocker arm, therefore the independent driving mechanism of additional designs is not required to, to reduce occupancy cylinder cap
The space of top surface reduces manufacturing cost.
Description of the drawings
Fig. 1 is shown according to the cam angle of the exhaust cam of the utility model engine cam and the relationship of cam lift
It is intended to.
Specific implementation mode
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
Novel protection domain is not restricted by specific implementation.
Unless otherwise explicitly stated, otherwise in entire disclosure and claims, term " comprising " or its change
It changes such as "comprising" or " including " etc. and will be understood to comprise stated element or component, and do not exclude other members
Part or other component parts.
As shown in Figure 1, according to a kind of engine cam of increase braking power of specific embodiment of the present invention
Exhaust cam, the basic circle portion of the exhaust cam is made of interior basic circle portion and outer basic circle portion, and exhaust cam coordinates with tappet, exhaust
Cam can master cylinder inside brake and when non-cylinder inside brake exhaust valve unlatching, the molded line of exhaust cam includes system in engine cylinder
The exhaust molded line of two kinds of working conditions of dynamic model formula and normal running mode, the Profile Design of the exhaust cam are as follows：
Interior base circle portion G~A, when exhaust cam goes to interior base circle portion G~a-quadrant, exhaust valve and braking valve are equal
It is in off state.Interior base circle portion G~A, cam angle are 221 °~239 °, cam lift 0mm.In the region, tappet exists
Above interior basic circle, hydraulic tappet is oil-filled, and plunger stretches out certain height, but due to the difference gap of inside and outside basic circle, braking valve
It can not open, remain closing.
CR part A~B are braked, when exhaust cam goes to braking CR part A~B area, tappet rises, and brake piston drives
Dynamic braking valve is opened, and exhaust valve is still in off state.Brake CR part A~B, cam angle be 344 °~360 ° and 1 °~
49 °, exhaust cam is 2.46565714mm relative to interior basic circle maximum lift.
Transition portion B~C of the outside basic circle in the parts CR is braked, this region is exhaust valve breeze way, as exhauxt valve opens
Preceding changeover portion, braking valve are still in open state by brake piston driving.Cam angle is 50 °~63 °, exhaust cam
It is 2.74120208mm relative to interior basic circle maximum lift.
Main lift part C~D of exhaust valve, in this region, exhaust elephant leg driving air valve bridge controls exhaust valve simultaneously
It before the main lift part of exhaust valve is terminated (at the time of near D points), is arranged with the unlatching of braking valve with distribution is exhausted
Valve-closing.Main lift part C~D of exhaust valve, cam angle are 64 °~187 °, and exhaust cam is relative to interior basic circle maximum
Lift is 10.34042959mm.
The outer inside basic circle transition portion D~E of basic circle, in this region, braking valve is under brake piston driving, when outer base
Justify before inside basic circle transition portion terminates (when E points), braking valve is closed under the driving of brake piston, and exhaust valve is always
It remains off.The outer inside basic circle transition portion D~E of basic circle, cam angle are 188 °~220 °, and exhaust cam is relative to interior
The maximum lift of basic circle is 2.79067381mm.
Interior base circle portion E~F, when cam goes to the braking subregions CR, exhaust valve and braking valve are closing shape
State.The cam angle of interior base circle portion E~F, interior base circle portion are 221 °~239 °, cam lift 0mm.
BGR sections of braking, in this region, tappet rises, and brake piston drives braking valve to open, and exhaust valve is still to close
State.BGR sections of braking, cam angle are 240 °~288 °, and exhaust cam is relative to the maximum lift of interior basic circle
1.86103969mm。
In said program, the driving mechanism of cylinder inside brake is integrated on exhaust rocker arm, is not required to the independent driving of additional designs
Mechanism reduces the space for occupying top surface of cylinder cover, reduces manufacturing cost.Cam directly drives exhaust rocker arm, in cylinder inside brake pattern
When, the brake piston on exhaust rocker arm is slowly stretched out or is retracted under the driving of rocking arm oil pressure fluid power, pushes braking elephant leg
Braking valve is opened, is turned on and off with achieving the purpose that control braking valve.
The braking power of the exhaust cam of the engine cam of the utility model is carried by CR small peaks and BGR small peak two parts
For.Use double brake small peak：CR small peaks and BGR small peaks, can effectively improve braking power.Meanwhile it being made in the parts braking CR
First there is one section to keep lift constant after dynamic valve opening, then be transitioned into main lift section, valve does not have to after first taking a seat main lift section again
It opens, the abrasion of valve and seat ring can be effectively reduced.
Following table is the cam angle and cam lift correspondence of the molded line of the exhaust cam.
The exhaust cam of the engine cam of the embodiments of the present invention integrates cylinder inside brake on a cam
With two operating mode cams of non-cylinder inside brake, which includes：It is vented main lift, CR (compression release) small peak, BGR
(recycling of braking gas) small peak.Wherein, CR small peaks can be such that compressed air in cylinder is released quickly against in exhaust manifold, and reduction is expanding
The positive work that stroke generates, and BGR small peaks then can increase charge in cylinder using the recirculated air from exhaust manifold, make compression
Stroke does negative work and becomes larger.Since braking power is carried by CR (compression discharges) small peaks and BGR (recycling of braking gas) small peak two parts
For braking power being significantly improved, to meet the requirement of the big braking power of some vehicles.After CR sections of braking valves are opened
First there is one section to keep lift constant, then be transitioned into main lift section, valve does not have to main lift section unlatching again after first taking a seat, can be effective
Reduce the abrasion of valve and seat ring.
The description of the aforementioned specific exemplary embodiment to the utility model is in order to illustrate and illustration purpose.These
Description is not wishing to for the utility model to be limited to disclosed precise forms, and it will be apparent that according to the above instruction, can carry out
Many change and variations.The purpose of selecting and describing the exemplary embodiment is that explaining the specific principle of the utility model
And its practical application, so that those skilled in the art can realize and utilize a variety of different examples of the utility model
Property embodiment and various chooses and changes.The scope of the utility model is intended to by claims and its waits similar shapes
Formula is limited.
Claims (4)
1. a kind of exhaust cam for the engine cam increasing braking power, the basic circle portion of the exhaust cam by interior basic circle portion and
Outer basic circle portion is constituted, and the exhaust cam coordinates with tappet, which is characterized in that the exhaust cam can master cylinder inside brake and
The molded line of the unlatching of exhaust valve when non-cylinder inside brake, the exhaust cam includes engine cylinder inside brake pattern and normally travel mould
The exhaust molded line of two kinds of working conditions of formula, the molded line of the exhaust cam include：
Interior base circle portion, when the exhaust cam goes to the interior base circle portion region, exhaust valve and braking valve are to close
Closed state；
The parts CR are braked, when the exhaust cam goes to the braking subregions CR, the tappet rises, and brake piston drives
The dynamic braking valve is opened, and the exhaust valve is still in off state；
The transition portion for braking the outside basic circle in the parts CR, is the changeover portion before the exhauxt valve opens, and the braking valve is protected
Hold open state；
The main lift part of exhaust valve, the exhaust valve and braking valve are opened, distribution is exhausted, when the exhaust valve
Main lift part terminate before, the exhaust valve closing；
The outer inside basic circle transition portion of basic circle, before the inside basic circle transition portion of outer basic circle terminates, the braking valve is being braked
It is closed under the driving of piston, the exhaust valve remains off；
Interior base circle portion, when the cam goes to the braking subregions CR, the exhaust valve and braking valve are to close
Closed state；And
BGR section of braking, when the cam goes to BGR sections of the braking, the tappet rising, described in the brake piston drives
Braking valve is opened, and the exhaust valve is still in off state.
2. the exhaust cam of engine cam according to claim 1, which is characterized in that the driving of the cylinder inside brake
Mechanism is integrated on exhaust rocker arm so that in the cylinder inside brake pattern, the brake piston on the exhaust rocker arm can be stretched
Go out or retract, to control being turned on and off for the braking valve.
3. the exhaust cam of engine cam according to claim 1, which is characterized in that the braking power is small by CR
Peak and BGR small peak two parts provide.
4. the exhaust cam of engine cam according to claim 1, which is characterized in that
The cam angle of the interior base circle portion is 221 °~239 °, cam lift 0mm；
The cam angle of the braking CR parts is 344 °~360 ° and 1 °~49 °, the exhaust cam relative to interior basic circle most
High-lift is 2.46565714mm；
The cam angle of the transition portion of the outside basic circle in the parts the braking CR is 50 °~63 °, and the exhaust cam is relative to interior
Basic circle maximum lift is 2.74120208mm；
The cam angle of the main lift part of the exhaust valve is 64 °~187 °, and the exhaust cam is relative to interior basic circle maximum
Lift is 10.34042959mm；
The cam angle of the inside basic circle transition portion of outer basic circle is 188 °~220 °, and the exhaust cam is relative to interior basic circle
Maximum lift be 2.79067381mm；
The cam angle of the interior base circle portion is 221 °~239 °, cam lift 0mm；And
The cam angle of BGR sections of the braking is 240 °~288 °, and the exhaust cam is relative to the maximum lift of interior basic circle
1.86103969mm。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820214768.2U CN207829965U (en) | 2018-02-07 | 2018-02-07 | Increase the exhaust cam of the engine cam of braking power |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820214768.2U CN207829965U (en) | 2018-02-07 | 2018-02-07 | Increase the exhaust cam of the engine cam of braking power |
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| Publication Number | Publication Date |
|---|---|
| CN207829965U true CN207829965U (en) | 2018-09-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201820214768.2U Active CN207829965U (en) | 2018-02-07 | 2018-02-07 | Increase the exhaust cam of the engine cam of braking power |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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2018
- 2018-02-07 CN CN201820214768.2U patent/CN207829965U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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