CN204476493U - Duplicated crank engine braking apparatus - Google Patents
Duplicated crank engine braking apparatus Download PDFInfo
- Publication number
- CN204476493U CN204476493U CN201520127924.8U CN201520127924U CN204476493U CN 204476493 U CN204476493 U CN 204476493U CN 201520127924 U CN201520127924 U CN 201520127924U CN 204476493 U CN204476493 U CN 204476493U
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- Prior art keywords
- cam
- valve
- engine braking
- rocking arm
- braking apparatus
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Abstract
A kind of duplicated crank engine braking apparatus, by changing the axial position of rocking arm on pitman arm shaft, tappet roller on rocking arm is switched to the connection with engine braking cam from the connection with conventional ignition cam, eliminates the valve motion of conventional ignition, produce the valve motion of engine braking.The valve motion that what engine braking apparatus of the present utility model obtained is produces with the unallied special brake cam of ignition cam milli and high power are braked, this special brake cam can only include braking exhaust cam, also can there be braking exhaust cam and braking intake cam simultaneously, all engine braking runnings are the mechanical type carrying of non-hydraulic formula, do not have the failure mode of hydraulic bearing.Control for brake of the present utility model is simple and clear, simple and compact for structure, and braking ability is excellent.
Description
Technical field:
The utility model relates to mechanical field, particularly relates to engine braking field, particularly a kind of duplicated crank engine braking apparatus.
Background technique:
In prior art, engine braking technology is widely known by the people, and only the motor producing power temporarily need be converted to endergonic air compressor.Fuel oil is cut off in transfer process, valve is opened at the end of engine piston compresses stroke is close, allow to be released by pressurized gas (being air during braking), the energy that motor pressurized gas in compression stroke absorbs, engine piston can not be turned back at expansion stroke subsequently, but be dissipated by the exhaust of motor and radiation system.Final result is effective engine braking, slows down the speed of vehicle.
A precedent of engine braking apparatus is that the U.S. Patent number 3220392 provided by comings (Cummins) discloses, the model utility of this patent utilizes hydraulic pressure transfer, by the Movement transmit of injection cam or contiguous exhaust cam to the valve of motor, on the basis of motor conventional valve motion, increase the valve motion of compression release braking.This model utility, within motor each cycle four-stroke, only produces first compression release braking.
US Patent No. 4,572,114 (1986) disclose the apparatus and method realizing two-cycle engine braking in four stroke engine.Like this, the bent axle of every two strokes or motor often rotates once, just produces an engine braking.In theory, within motor each cycle four-stroke, produce two strokes brakings of two second compression releases, its braking force will be the twice of traditional four-stroke braking force.But because this model utility adopts two cover hydraulic driving systems, its mechanism is very complicated, does not obtain practical application.
US Patent No. 5,537,976 (1996) disclose another kind of two-cycle engine braking apparatus and method, have employed actuated by cams, hydraulic connecting, high-speed electromagnetic valve and electronically controlled means, realize valve motion.Due in each cycle, solenoid valve all needs to open at least one times, has extra high requirement to the reliability of solenoid valve and durability.Add hydraulically powered other problem, as the control of valve crash speed, the cold start-up of motor etc., this model utility does not also obtain practical application.
US Patent No. 6,293, discloses the apparatus and method of another two-cycle engine braking 248 (2001) years.In order to realize two-cycle engine braking in four stroke engine, except needs four cams, also must adopt four rocking arms: two exhaust rocker arms (wherein a braking is used) and two intake rockers (wherein a braking is used), structure is all very complicated with control, and employing is also the valve that hydraulic type opens motor.
Model utility content:
The purpose of this utility model is to provide a kind of duplicated crank engine braking apparatus, described this duplicated crank engine braking apparatus will solve engine braking apparatus complex structure in prior art, it is loaded down with trivial details to control, hydraulic driving is opened reliability and the poor durability of valve and applies limited technical problem, also will solve the high oil pressure of hydraulic bearing, high-leakage and high technical problem of being out of shape.
The utility model provides a kind of duplicated crank engine braking apparatus, described motor comprises cam and valve bridge, the two ends of described valve bridge are connected to first valve and a duaspiracle, described cam comprises conventional ignition cam and engine braking cam, there are differences between the lift of described conventional ignition cam and the lift of engine braking cam, there are differences between the phase place of conventional ignition cam and the phase place of engine braking cam, wherein, described duplicated crank engine braking apparatus comprises a rocking arm, one and half rocking arms, a pitman arm shaft and a rocking arm axial actuating mechanism, to be arranged on described pitman arm shaft described rocking arm rotary type and there is first axial position and second axial position, one end of rocking arm is connected with cam, the other end of rocking arm is connected with half described rocking arm, be arranged on pitman arm shaft one end rotary type of half rocking arm, the other end of half rocking arm is connected with described valve bridge, described rocking arm axial actuating mechanism is connected with rocking arm.
Further, be also provided with valve motion and lose mechanism between half described rocking arm and valve bridge, described valve motion loss mechanism cuts off the Movement transmit between half rocking arm and valve bridge.
Further, described valve motion is lost mechanism and is integrated in half described rocking arm.
Further, it is automatic valve gap adjusting mechanism that described valve motion loses mechanism.
Further, the first described valve and duaspiracle are exhaust valve, and described cam is exhaust cam, and described exhaust cam comprises conventional ignition exhaust cam and engine braking exhaust cam.
Further, the first described valve and duaspiracle are intake valve, and described cam is intake cam, and described intake cam comprises conventional ignition intake cam and engine braking intake cam.
Further, between half rocking arm and the first valve, a single valve actuating mechanism is provided with.
The utility model is compared with prior art, and its effect is actively with obvious.The first axial position that the utility model utilizes rocking arm axial actuating mechanism to make rocking arm on pitman arm shaft and the second axial position switch, thus contact with engine braking cam with conventional ignition cam respectively.During conventional ignition actuated by cams rocking arm, rocking arm drives half rocking arm to drive the opening and closing of the first valve and duaspiracle by valve bridge.When engine braking cam drives rocking arm, rocking arm drives half rocking arm to drive the opening and closing of the first valve and duaspiracle by valve bridge, which includes the course of action that the first valve and duaspiracle realize engine braking.When valve motion loss mechanism being set in valve bridge and single valve actuating mechanism is set between half rocking arm and the first valve, start valve motion to lose after mechanism, during igniting running and the connection of dual valve can be converted to the connection of braking and opening single valve when operating.The utility model have simple and compact for structure, manufacture assembling easily, little, the reliable durable of brake load and the advantage such as to be widely used.Due to brake cam and conventional ignition cam separate, braking ability can be optimized.The utility model adopts solid chain type (mechanical connection) transmitted load, eliminates traditional engine brake and adopts the high oil pressure of hydraulic type carrying generation, high distortion and the defect such as high-leakage and hydraulic jack or failure mode.
Accompanying drawing illustrates:
Fig. 1 is the schematic diagram (side view) of the embodiment 1 of duplicated crank engine braking apparatus of the present utility model.
Fig. 2 is rocking arm in the embodiment 1 of duplicated crank engine braking apparatus of the present utility model schematic diagram when being in the first axial position.
Fig. 3 is rocking arm in the embodiment 1 of duplicated crank engine braking apparatus of the present utility model schematic diagram when being in the second axial position.
Fig. 4 is the schematic diagram of the embodiment 2 of duplicated crank engine braking apparatus of the present utility model.
Fig. 5 is the schematic diagram of the liquid flow control valve in the embodiment 2 of duplicated crank engine braking apparatus of the present utility model.
Embodiment:
Embodiment 1:
Fig. 1 is the schematic diagram (side view) of the embodiment 1 of duplicated crank engine braking apparatus of the present utility model.Valve actuator 200(explanation is here applicable to intake valve actuator and exhaust valve actuator simultaneously) comprise cam (conventional ignition cam 230 and engine braking cam 2302), rocking arm 210 and valve bridge 400.Rocking arm 210, except can rotating on pitman arm shaft 205, can also move axially (Fig. 2 and Fig. 3) along pitman arm shaft 205.One end of rocking arm 210 is connected with cam by tappet roller 235.The boss 220 of conventional ignition cam and the boss 232 and 233 of engine braking cam have different lifts and phase place (braking boss can have varying number, shape and size).But these two cams are positioned on same camshaft 225, mutually adjoin and have roughly the same basic circle.The other end of rocking arm 210 is connected with one and half rocking arms 212, one end rotary type of half rocking arm 212 is arranged on pitman arm shaft 205, the other end of half rocking arm 212 is connected with valve bridge 400 by valve clearance controlling mechanism (adjusting screw 110 and resemble enough 114), and the two ends of valve bridge 400 are connected to first valve 301 and a duaspiracle 302.Valve 301 and 302 is biased on the valve seat 320 of engine cylinder-body 500 by valve spring 311 and 312, stops gas to flow between engine cylinder and air flue 600.The valve clearance adjusting screw 110 of valve clearance controlling mechanism is fixed tightly on half rocking arm 212 by locking nut 105.
Rocking arm 210 also with link (being hydraulic piston here) 162, by the oil pressure cntrol from the oil supply gallery 211 in pitman arm shaft 205, is connected with axial actuating mechanism 100.Axial actuating mechanism 100 can be the auxiliary cam axle synchronous with camshaft 225, axial boss above auxiliary cam axle or groove, band follower link (hydraulic piston) 162, moves to the second axial position (Fig. 3) be connected with engine braking cam 2302 from the first axial position (Fig. 2) be connected with conventional ignition cam 230 by rocking arm 210.Axial actuating mechanism 100 also can be integrated in other mechanism in rocking arm or pitman arm shaft.
The operating process of the present embodiment is as follows.In conventional ignition state; rocking arm 210 is in the first axial position on pitman arm shaft 205; rocking arm 210 is connected with conventional ignition cam 230 (Fig. 2) by tappet roller 235; Movement transmit of conventional ignition cam 230 to be given two valves 301 and 302 of half rocking arm 212, valve bridge 400 and motor, produce conventional valve motion during engine ignition.
When needing the braking running running of the conventional ignition of motor being converted to motor, link (hydraulic piston) 162 is connected with axial actuating mechanism 100, rocking arm 210 is moved to the second axial position from the first axial position by axial actuating mechanism 100, rocking arm overhead cam roller 235 is switched to from be connected with conventional ignition cam 230 (Fig. 2) and is connected (Fig. 3) with engine braking cam 2302, the motion of conventional ignition cam 230 is lost, engine braking cam 2302 move through rocking arm 210, half rocking arm 212 and valve bridge 400, pass to two valves 301 and 302, produce the valve motion of engine braking.
Embodiment 2:
Fig. 4 is the schematic diagram of the embodiment 2 of duplicated crank engine braking apparatus of the present utility model.The difference of the present embodiment and above-described embodiment 1 is that adding valve motion between half rocking arm 212 and valve bridge 400 loses mechanism 250, and the details comprising piston 160 and liquid flow control valve 75(valve please see Figure 5).Here it is also a kind of automatic valve gap adjusting mechanism that valve motion loses mechanism 250, piston 160 is placed in piston hole 190 slidably, by liquid flow control valve 75, the fluid column being 234 with height of formation between rocking arm 210 is connected, and the height 234 of fluid column regulates automatically according to the gap between cam and valve.
The liquid flow control valve 75(be integrated in half rocking arm 212 please see Figure the partial section of 5) comprise non-return valve 165, biased upwards by spring 177.Non-return valve 165 is above by the driving of the piston 58 of a funnel form, and piston 58 is downwards biased by spring 256.When providing fluid (lubricating oil as motor) with pressure in fluid passage 218, the active force of oil pressure counter spring 256, upwards moves piston 58.Meanwhile, the active force of oil pressure counter spring 177, by non-return valve 165 to moving down, to hydraulic channel 216 fuel feeding, and the below of non-return valve 165 (comprising hydraulic channel 216 and coupled logical all hydraulic passage and hydraulic pressure cavity, the piston hole 190 as in Fig. 4) is formed hydraulic pressure locking.
When needing the braking running running of the conventional ignition of motor being converted to motor, rocking arm 210 is moved to the second axial position from the first axial position by link (hydraulic piston 162) by axial actuating mechanism 100; rocking arm overhead cam roller 235 is switched to from be connected with conventional ignition cam 230 (Fig. 2) and is connected (Fig. 3) with engine braking cam 2302, and the motion of conventional ignition cam 230 is lost.Meanwhile, lead to fluid passage 218 emptying of liquid flow control valve 75, piston 58 moves down (see figure 5) by the effect of spring 256, non-return valve 165 is pushed away valve seat, piston hole 190 emptying making hydraulic pressure oil duct 216 and communicate with it, fluid column above piston 160 becomes space 234(and sees Fig. 2), making the motion of brake cam (boss 232 and 233) resembling foot 114 place loss, valve 301 and 302 cannot be passed to by valve bridge 400.But, owing to being provided with a single valve actuating mechanism between half rocking arm 212 and the first valve 301, the connection moving through the brake connecting rod 116 of half rocking arm 212 in 112 places and valve bridge 400 of brake cam 2302, pass to first valve 301 in two valves of motor, produce the valve motion of engine braking.Here single valve actuating mechanism also can comprise various different mechanism, as mechanism etc. is lost in valve clearance controlling mechanism and motion.Even simple Mechanical Contact, also can comprise and resemble foot or other wear-resisting link.
Be placed in the snap ring 176(in piston hole 190 or other stop mechanism) stroke of limited piston 160 prevent it from coming off (being conducive to carrying and assembling) from piston hole 190.Causing flying off of moving element to prevent from losing the space 234 of mechanism's generation due to valve motion, adding the spring or elastic element 117,118 and 198 preventing flying off here.The shape of these elastic elements, kind and setting and position can change, and its objective is the moving element in assurance device, as valve bridge 400, do not produce and fly off.The height in space 234 is determined by the height of the braking boss on brake cam, and its purposes is the motion absorbing (loss) brake cam, makes it can not pass to valve by valve bridge.
Above-mentioned explanation contains different embodiments, and this should not be regarded as the restriction to the utility model scope, but representatively concrete illustrations more of the present utility model, other differentiation many all likely therefrom produce.For example, the engine braking apparatus shown here or method, not only can be used for overhead cam engine, also can be used for push rod/pushing type motor; Not only can be used for driving exhaust valve, also can be used to drive intake valve.
In addition, axial actuating mechanism here can be not only mechanical cam mechanism, also can be other mechanism, as the combination of the mechanisms such as hydraulic pressure, pneumatic and electromagnetism and said mechanism; Not only can be integrated in valve actuator (as rocking arm), also can be positioned at outside valve actuator (as fixing on the engine or on other moving element of motor).
Further, valve motion here loses mechanism, the design of brake circuit and the structure of liquid flow control valve and arrangement etc., can be different.
Therefore, scope of the present utility model should not decided by above-mentioned concrete illustration, but is decided by affiliated claim and the suitable power of law thereof.
Claims (7)
1. a duplicated crank engine braking apparatus, described motor comprises cam and valve bridge, the two ends of described valve bridge are connected to first valve and a duaspiracle, described cam comprises conventional ignition cam and engine braking cam, there are differences between the lift of described conventional ignition cam and the lift of engine braking cam, there are differences between the phase place of conventional ignition cam and the phase place of engine braking cam, it is characterized in that: described duplicated crank engine braking apparatus comprises a rocking arm, one and half rocking arms, a pitman arm shaft and a rocking arm axial actuating mechanism, to be arranged on described pitman arm shaft described rocking arm rotary type and there is first axial position and second axial position, one end of rocking arm is connected with cam, the other end of rocking arm is connected with half described rocking arm, be arranged on pitman arm shaft one end rotary type of half rocking arm, the other end of half rocking arm is connected with described valve bridge, described rocking arm axial actuating mechanism is connected with rocking arm.
2. duplicated crank engine braking apparatus as claimed in claim 1, is characterized in that: be also provided with valve motion between half described rocking arm and valve bridge and lose mechanism, and described valve motion loss mechanism cuts off the Movement transmit between half rocking arm and valve bridge.
3. duplicated crank engine braking apparatus as claimed in claim 2, is characterized in that: described valve motion is lost mechanism and is integrated in half described rocking arm.
4. duplicated crank engine braking apparatus as claimed in claim 2, is characterized in that: it is automatic valve gap adjusting mechanism that described valve motion loses mechanism.
5. duplicated crank engine braking apparatus as claimed in claim 1, it is characterized in that: the first described valve and duaspiracle are exhaust valve, described cam is exhaust cam, and described exhaust cam comprises conventional ignition exhaust cam and engine braking exhaust cam.
6. duplicated crank engine braking apparatus as claimed in claim 1, it is characterized in that: the first described valve and duaspiracle are intake valve, described cam is intake cam, and described intake cam comprises conventional ignition intake cam and engine braking intake cam.
7. duplicated crank engine braking apparatus as claimed in claim 1, is characterized in that: between half rocking arm and the first valve, be provided with a single valve actuating mechanism.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520127924.8U CN204476493U (en) | 2015-03-05 | 2015-03-05 | Duplicated crank engine braking apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520127924.8U CN204476493U (en) | 2015-03-05 | 2015-03-05 | Duplicated crank engine braking apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204476493U true CN204476493U (en) | 2015-07-15 |
Family
ID=53632292
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520127924.8U Withdrawn - After Issue CN204476493U (en) | 2015-03-05 | 2015-03-05 | Duplicated crank engine braking apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204476493U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104712397A (en) * | 2015-03-05 | 2015-06-17 | 上海尤顺汽车部件有限公司 | Combined rocker engine braking device |
| WO2016059456A1 (en) * | 2014-10-15 | 2016-04-21 | Shanghai Universoon Auto Parts Co., Ltd. | Engine braking method and system |
| CN109667639A (en) * | 2018-12-28 | 2019-04-23 | 潍柴动力股份有限公司 | Engine braking system |
| CN112696247A (en) * | 2019-10-07 | 2021-04-23 | 现代自动车株式会社 | Compression release engine brake |
-
2015
- 2015-03-05 CN CN201520127924.8U patent/CN204476493U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016059456A1 (en) * | 2014-10-15 | 2016-04-21 | Shanghai Universoon Auto Parts Co., Ltd. | Engine braking method and system |
| CN104712397A (en) * | 2015-03-05 | 2015-06-17 | 上海尤顺汽车部件有限公司 | Combined rocker engine braking device |
| CN109667639A (en) * | 2018-12-28 | 2019-04-23 | 潍柴动力股份有限公司 | Engine braking system |
| CN112696247A (en) * | 2019-10-07 | 2021-04-23 | 现代自动车株式会社 | Compression release engine brake |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20150715 Effective date of abandoning: 20200825 |