CN208702482U - Actuated by cams formula engine braking apparatus - Google Patents
Actuated by cams formula engine braking apparatus Download PDFInfo
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- CN208702482U CN208702482U CN201821257492.2U CN201821257492U CN208702482U CN 208702482 U CN208702482 U CN 208702482U CN 201821257492 U CN201821257492 U CN 201821257492U CN 208702482 U CN208702482 U CN 208702482U
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- rocker body
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- actuating mechanism
- hydraulic
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Abstract
The utility model discloses a kind of actuated by cams formula engine braking apparatus.Device includes rocker body, and valve actuating mechanism, hydraulic actuating mechanism and gap control mechanism are equipped in rocker body；When engine enters braking mode, hydraulic oil enters the intracorporal hydraulic cylinder of rocker arm, hydraulic actuating mechanism pushes gap control mechanism, control device and engine cam contact surface gap, it is matched by engine cam, it realizes and engine exhaust valve is opened when compression travel ends, compressed air is released, it is transferred in atmosphere by the thermodynamic energy that the mechanical energy of running car is transformed, to realize braking of the engine to automobile.The characteristics of the utility model is by roller eccentric shaft and the roller central spindle decentraction being connected with rocker body, ingenious realization is eccentric to be required, simple and reliable for structure；And the utility model does not use complicated hydraulic-driven structure, simplifies design, reduces cost, reduce the mechanism reaction time.
Description
Technical field
The utility model relates to machinery field more particularly to the exhaust braking of engine, especially a kind of cam is driven
Dynamic formula engine braking apparatus.
Background technique
Since the 1960s, trucking industry obtains huge development, and the truck of today loads heavier, speed more
Height, in order to reduce the consumption to fuel oil, the frictional resistance of transmission system has been further reduced, and parasite drag has also been obtained into one
The reduction of step；Vehicle moulding simultaneously more meets aerodynamics, this declines the natural slowing down power(SDP) of vehicle constantly.As vehicle
The braking ability of active safety should be upgraded transformation simultaneously, therefore enhance the control energy of vehicle using supplement braking system
Power has become very urgent.
In the prior art, engine braking refers to and lifts gas pedal, but do not depress clutch, utilizes engine
Resistance to compression pression, internal friction and the intake and exhaust resistance that compression travel generates form braking action to driving wheel.In the process, it fires
Oil is cut off, and engine piston continues operation up and down under automobile inertial effect, and when operation to compression travel, air is pressed
Contracting, the kinetic energy of automobile is converted into the thermodynamic energy of compressed air at this time, opens exhaust valve at the end of compression travel, allows and absorb
The air of energy is discharged, and running velocity reduces, i.e. realization engine braking.
American commings (Cummins) propose hydraulic engine brake, and are disclosed (United States Patent (USP) in nineteen sixty-five
Number 3220392).This is a precedent of engine braking apparatus.In the technology, engine brake passes through hydraulic drive for machine
Tool input is transmitted to open exhaust valve.The main piston moved back and forth in master piston bore is typically included on hydraulic circuit, it should
The mechanical input from engine is moved back and forth, as the movement of the shake of injector rocker arm, main piston is transmitted by hydraulic way
To the auxiliary piston on hydraulic circuit, move back and forth it in slave piston bore, auxiliary piston directly or indirectly acts on exhaust valve
On, generate the valve actuation of engine braking running.Such engine braking system is the attachment of overhead on the engine.In order to install
Such device will add washer between cylinder and valve deck, therefore add additional the height, weight and cost of engine.
Summary of the invention
The utility model aim is in view of the deficienciess of the prior art, providing a kind of actuated by cams formula engine braking
Device can be improved efficiency when engine exhaust and brake.
This actuated by cams formula engine braking apparatus of the utility model, including it is rocker body, valve actuating mechanism, hydraulic
Executing agency and gap control mechanism.
Valve actuating mechanism, hydraulic actuating mechanism and gap control mechanism are installed in the rocker body；Rocker body passes through
Intermediate through-hole is mounted on motor rockshaft, inside be provided with hydraulic oil duct, oil duct one end connection liquid cylinder pressure, outside the other end
Connect engine braking control oil supply mechanism；Gap control mechanism and valve actuating mechanism are installed in rocker body rear and front end respectively, interior
Portion is provided with hydraulic cylinder, for installing hydraulic actuating mechanism；Rocker body is bearing swing with centre.
The roller eccentric shaft is a hollow cylindrical structure, but excircle configuration and interior open circles not coaxial line, to reach
Eccentric effect；Interior open circles and the roller axle center cooperate, roller axle center connecting rocker arm body；Outer circle entity and the fixed company of swing arm
It connects.
The valve actuating mechanism is mounted on rocker body rear end comprising gap adjustment nut, gap adjustment bolt and recessed
Ball；The gap adjustment bolt is mounted in the threaded hole of rocker body rear end, and the gap adjustment nut is matched with gap adjustment bolt
Installation is closed, for adjusting valve actuation gap；The recessed ball is connect with valve stem, driving exhaust valve opening and closing.
The gap control mechanism is mounted on rocker body front end comprising swing arm, roller, roller eccentric shaft and pipe axis
Core；Swing arm is cam structure, and basic circle and roller, roller eccentric shaft circular arc are concentric, and swing arm boss end is provided with the recessed of certain depth
Slot；It is used to joint gap control mechanism and rocker body with the roller central spindle of roller eccentric shaft cooperation；Roller end face with start
Machine cam directly contacts, and inputs contact source as the utility model power.
It further include a small boss, small boss is convex on the basic circle of the engine cam in addition to an original boss
Position on wheel guarantees to touch roller end face when piston compression stroke is ended, jack up rocker body, drive with this
The unlatching of exhaust valve when dynamic engine braking.
The hydraulic actuating mechanism includes spool, baffle ring, circlip, helical spring and pin；Spool front end passes through pin and swing arm
Groove connection, rear end is contacted with helical spring；Helical spring and spool coaxial line, cover outside spool, one end and spool rear end
Contact, the other end are contacted with baffle ring, and helical spring is strapped in rocker body hydraulic cylinder by circlip by baffle ring again, thus further about
The axial movement of beam spool.
The utility model compares with prior art, and beneficial effect mainly has following aspect:
(1) in the utility model gap control mechanism, not by roller eccentric shaft and the roller central spindle being connected with rocker body
Concentric feature realizes eccentric work, i.e., same with swing arm basic circle and roller eccentric shaft when swing arm drives roller eccentric shaft turns
The roller of the heart will the opposing rollers central spindle center of circle rotation so that roller end face changes with engine cam contact surface gap.
(2) the utility model does not use complicated hydraulic-driven structure, but directly by the injection of hydraulic oil with unload
Driving is carried, design is simplified, reduces costs, reduce the mechanism reaction time.
Detailed description of the invention
Fig. 1 is utility model device entirety axonometric drawing.
Fig. 2 is utility model device entirety side view view in full section.
Fig. 3 is the utility model hydraulic actuating mechanism partial enlarged view.
Fig. 4 is the utility model engine work pattern diagram.
Fig. 5 is the utility model engine braking modes schematic diagram.
Fig. 6 is the utility model gap control mechanism explosive view.
Wherein, 1- rocker body, 2- valve actuating mechanism, 3- hydraulic actuating mechanism, 4- gap control mechanism, 5- gap adjustment
Nut, 6- gap adjustment bolt, the recessed ball of 7-, the hydraulic oil duct of 8-, 9- roller eccentric shaft, 10- roller, 11- roller central spindle, 12- pendulum
Arm, 13- spool, 14- pin, 15- circlip, 16- helical spring, 17- baffle ring, 18- engine cam, 19- hydraulic cylinder.
Specific embodiment
The utility model is more fully retouched below with reference to relevant drawings for the ease of understanding the utility model,
It states.The preferred embodiment of the utility model is given in attached drawing, still, the utility model can come real in many different forms
It is existing, however it is not limited to embodiment described herein.On the contrary, purpose of providing these embodiments is makes to disclose the utility model
The understanding of content is more thorough and comprehensive.
Unless otherwise defined, all technical and scientific terms used herein are led with the technology for belonging to the utility model
The normally understood meaning of the technical staff in domain is identical.Terminology used in the description of the utility model herein only be
Description specific embodiment purpose, it is not intended that in limitation the utility model.
As shown in fig.1, a kind of actuated by cams formula engine braking apparatus provided by the utility model, including rocker body 1,
Valve actuating mechanism 2, hydraulic actuating mechanism 3 and gap control mechanism 4, the utility model use fabricated structure, convenient for assembly and disassembly.
As shown in attached 1, attached drawing 2, attached drawing 5, the valve actuating mechanism 2 is mounted on 1 rear end of rocker body, the gap
Control mechanism 4 is mounted on 1 front end of rocker body；Rocker body 1 with centre for bearing be mounted on motor rockshaft, inside be provided with
Hydraulic oil duct 8, oil duct one end connection liquid cylinder pressure 19, the external engine braking of the other end control oil supply mechanism；The upper end is provided with liquid
Cylinder pressure, for installing hydraulic actuating mechanism 3；Rocker body 1 is bearing swing with centre.
As shown in Fig. 2, the valve actuating mechanism 2 is mounted on 1 rear end of rocker body comprising gap adjustment nut
5, gap adjustment bolt 6 and recessed ball 7；Gap adjustment nut 5 and gap adjustment bolt 6 are used to adjust valve actuation gap；Recessed ball 7
It is connect with valve stem, driving exhaust valve opening and closing.
As shown in attached drawing 2, attached drawing 4, attached drawing 6, the gap control mechanism 4 is mounted on 1 front end of rocker body comprising
Roller eccentric shaft 9, roller 10, roller central spindle 11 and swing arm 12；Swing arm 12 is cam structure, and basic circle and roller 10, roller are inclined
9 circular arc of mandrel is concentric, and 12 boss end of swing arm is provided with the groove of certain depth；With the roller central spindle of the eccentric cooperation of roller eccentric shaft 9
11 are used to joint gap control mechanism 4 and rocker body 1；10 end face of roller is directly contacted with engine cam 18, practical as this
New type power inputs contact source.
As shown in attached drawing 2, attached drawing 3, attached drawing 5, the hydraulic actuating mechanism 3 includes spool 13, pin 14, circlip 15, spiral
Spring 16 and baffle ring 17；13 front end of spool is connect by pin 14 with 12 groove of swing arm, and rear end is contacted with helical spring 16；Spiral
Spring 16 and 13 coaxial line of spool, cover outside spool 13, and end in contact behind one end and spool 13, the other end is contacted with baffle ring 17, keep off
Helical spring 16 is strapped in 1 hydraulic cylinder 19 of rocker body by circlip 15 by ring 17 again, to further constrain the axial direction of spool 13
Movement.
The course of work of the utility model is as follows:
As shown in attached drawing 2, attached drawing 4, attached drawing 5, attached drawing 6, valve actuating mechanism 2 is installed in the rocker body 1, hydraulic is held
Row mechanism 3 and gap control mechanism 4, when engine enters braking mode, automotive wheel kinetic energy is transmitted to by power train to be started
Machine is transferred to the mechanical energy of reciprocating motion of the pistons；When piston enters compressed air stroke, piston does negative work to air, mechanical
The thermodynamic energy of compressed air can be converted into；It is controlled at this point, hydraulic oil controls oil supply mechanism by engine braking, by liquid
Pressure oil road 8 enters the hydraulic cylinder in rocker body 1, and spool 13 is pushed to axially move outward, further swing arm 12 is pushed to rotate；Between
Roller eccentric shaft 9 in gap control mechanism 4, roller 10 and and roller axle center 11 between existing eccentric structure make 10 end of roller
Face and 18 contact gap of engine cam reduce；When the small boss 20 for the engine cam 18 for being machined with small boss in specific position
When touching 10 end face of roller, rocker body 1 is jacked up, and turns over angle from 4 side of gap control mechanism to 2 side of valve actuating mechanism
Φ, valve actuating mechanism 2 drive engine exhaust valve opening, and compressed air is released, and thermodynamic energy is transferred in atmosphere,
To realize braking of the engine to automobile.
As shown in Fig. 3, when engine is in normal mode of operation, engine braking control oil supply mechanism closing is let out
Oil, spool 13 drive swing arm 12 to go back to normal position under the effect of 16 return of helical spring, further, 10 end face of roller and hair
18 gap of motivation cam increases, and the small boss 20 of engine cam 18 and 10 end face minimum range of roller are Δ, makes it can only be by
Normal mode drives rocker body 1, pushes exhaust valve normal exhaust.
Above-described embodiment is the preferable embodiment of the utility model, but the embodiments of the present invention is not by above-mentioned
The limitation of embodiment, it is made under other any spiritual essence and principles without departing from the utility model to change, modify, replacing
In generation, simplifies combination, should be equivalent substitute mode, is included within the protection scope of the utility model.
Claims (5)
1. a kind of actuated by cams formula engine braking apparatus, it is characterised in that: including rocker body (1), valve actuating mechanism (2),
Hydraulic actuating mechanism (3) and gap control mechanism (4)；The rocker body (1) is mounted on engine rocker by intermediate through-hole
On axis, gap control mechanism (4) are installed in rocker body (1) front end, and valve actuating mechanism (2) are installed in rear end, open inside rocker body (1)
There is the hydraulic cylinder (19) for installing hydraulic actuating mechanism (3), is provided with hydraulic oil duct (8) inside rocker body (1), hydraulic oil duct one
It holds connection liquid cylinder pressure (19), the external engine braking of the other end controls oil supply mechanism；Rocker body (1) is bearing front and back pendulum with centre
It is dynamic；
The gap control mechanism (4) includes roller eccentric shaft (9), roller (10), roller central spindle (11) and swing arm (12)；It is described
Swing arm (12) is cam structure, and basic circle and the roller (10) and roller eccentric shaft (9) circular arc are concentric, with roller eccentric shaft
(9) the roller central spindle (11) of eccentric cooperation is used to connect the gap control mechanism (4) and the rocker body (1)；Roller
(10) end face is directly contacted with engine cam (18), inputs contact source as power.
2. actuated by cams formula engine braking apparatus according to claim 1, it is characterised in that: valve actuating mechanism (2)
Including gap adjustment nut (5), gap adjustment bolt (6) and recessed ball (7)；The gap adjustment bolt (6) is mounted on rocker body
(1) in the threaded hole of rear end, the gap adjustment nut (5) is coupled with gap adjustment bolt (6), for adjusting valve actuation
Gap；The recessed ball (7) connect with valve stem, driving exhaust valve opening and closing.
3. actuated by cams formula engine braking apparatus according to claim 1, it is characterised in that: the roller eccentric shaft
It (9) is a hollow cylindrical structure, but excircle configuration and interior open circles not coaxial line, to reach eccentric effect；Interior open circles with
Roller axle center (11) cooperation, roller axle center (11) connecting rocker arm body (1)；Outer circle entity is fixedly connected with swing arm (12).
4. actuated by cams formula engine braking apparatus according to claim 1, it is characterised in that: the engine cam
It (18) further include a small boss (20), small boss (20) is on cam (18) on basic circle in addition to an original boss
Position guarantees to touch roller (10) end face when piston compression stroke is ended, jack up rocker body (1), come with this
The unlatching of exhaust valve when driving engine braking.
5. actuated by cams formula engine braking apparatus according to claim 1, it is characterised in that: the hydraulic actuating mechanism
It (3) include spool (13), pin (14), circlip (15), helical spring (16) and baffle ring (17)；Spool (13) front end passes through institute
It states pin (14) to connect with the swing arm (12), rear end is contacted with the helical spring (16)；Helical spring (16) and spool (13)
Coaxial line, cover spool (13) outside, helical spring (16) one end and spool (13) end in contact afterwards, the other end and the baffle ring (17)
Contact, baffle ring (17) one end are contacted with helical spring (16), and the other end is contacted with circlip (15)；Baffle ring (17) is by helical spring
(16) it is strapped in the hydraulic cylinder (19) of rocker body, to constrain the axial movement of spool (13).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821257492.2U CN208702482U (en) | 2018-08-06 | 2018-08-06 | Actuated by cams formula engine braking apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821257492.2U CN208702482U (en) | 2018-08-06 | 2018-08-06 | Actuated by cams formula engine braking apparatus |
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| Publication Number | Publication Date |
|---|---|
| CN208702482U true CN208702482U (en) | 2019-04-05 |
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ID=65941572
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821257492.2U Active CN208702482U (en) | 2018-08-06 | 2018-08-06 | Actuated by cams formula engine braking apparatus |
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| Country | Link |
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| CN (1) | CN208702482U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109162785A (en) * | 2018-08-06 | 2019-01-08 | 浙江大学 | A kind of actuated by cams formula engine braking apparatus and its braking method |
| CN112554985A (en) * | 2019-09-26 | 2021-03-26 | 上海汽车集团股份有限公司 | Valve train drive device |
-
2018
- 2018-08-06 CN CN201821257492.2U patent/CN208702482U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109162785A (en) * | 2018-08-06 | 2019-01-08 | 浙江大学 | A kind of actuated by cams formula engine braking apparatus and its braking method |
| CN109162785B (en) * | 2018-08-06 | 2023-11-24 | 浙江大学 | Cam-driven engine braking device and braking method thereof |
| CN112554985A (en) * | 2019-09-26 | 2021-03-26 | 上海汽车集团股份有限公司 | Valve train drive device |
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