CN203130181U - Novel adjustable hydraulic tappet - Google Patents
Novel adjustable hydraulic tappet Download PDFInfo
- Publication number
- CN203130181U CN203130181U CN 201320074630 CN201320074630U CN203130181U CN 203130181 U CN203130181 U CN 203130181U CN 201320074630 CN201320074630 CN 201320074630 CN 201320074630 U CN201320074630 U CN 201320074630U CN 203130181 U CN203130181 U CN 203130181U
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- tappet
- engine
- hydraulic
- fluid chamber
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- 239000003921 oil Substances 0.000 claims description 57
- 239000012530 fluid Substances 0.000 claims description 37
- 239000010720 hydraulic oil Substances 0.000 claims description 4
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 8
- 238000005086 pumping Methods 0.000 description 4
- 238000007789 sealing Methods 0.000 description 4
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000002045 lasting effect Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000002372 labelling Methods 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 239000010734 process oil Substances 0.000 description 1
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Abstract
The utility model relates to a novel adjustable hydraulic tappet. The novel adjustable hydraulic tappet can remove engine valve clearance, and can enable an exhaust valve to keep continuously open through adjustment of hydraulic pressure under the working condition of engine brake, the opening degree is controlled by the hydraulic pressure, and therefore the power of engine brake is adjustable. The novel adjustable hydraulic tappet comprises a tappet disk which makes direct contact with an engine air distribution cam and a plunger which makes direct contact with a push rod. An oil duct which is machined on an engine body is arranged between the tappet disk and the plunger. A proportional valve is arranged at the position of an inlet of the oil duct, and a solenoid valve is arranged at the position of an outlet of the oil duct. A one-way valve is installed at the position of an inlet of a hydraulic chamber between the tappet disk and the plunger. When an engine normally works, the proportional valve inputs low oil pressure to remove the valve clearance. Under the working condition of engine brake, the opening degree of a valve can be adjusted in a dynamic mode through the fact that the pressure of oil which flows into the oil duct can be adjusted through the proportional valve, and requirements of engine brake under different working conditions can be met. The novel adjustable hydraulic tappet can be used matched with an engine exhaust emission retarder to achieve a better braking effect.
Description
Technical field
The utility model relates to the hydraulic tappet that engine valve actuating mechanism is adjusted, and refers in particular to a kind of new type of adjustable hydraulic tappet.It can eliminate the valve clearance by the adjustment to hydraulic coupling size in the hydraulic tappet under the motor normal working, change engine brake power thereby can also adjust the valve opening size automatically under overrunning condition.
Background technique
Valve tappet is very important parts in the engine valve actuating mechanism, hydraulic tappet is installed between the valve cam and valve stem of camshaft overhead type motor usually, be used for eliminating the valve clearance, when the hot state of motor changes, hydraulic tappet can be adjusted effective active length thereupon, thereby satisfies work requirements.
When engine braking refers to that automobile drags engine running, because the Braking efficiency of generations such as the mechanical loss of motor, pumping loss.Because it is very little normally to drag under the operating mode pumping loss of motor, thereby the engine brake power of this moment is lower usually.Present most of diesel engine increases exhaust back pressure by exhaust retarder is installed, and the mode that increases the motor pumping loss strengthens braking effect.But because only the pumping loss increment that produces by the mode that increases exhaust back pressure is limited, therefore the simple braking effect of exhaust retarder that uses neither be fine.
Present hydraulic tappet mostly is to utilize the engine lubrication oil pressure, forms the hydraulic fluid chamber of sealing between cam and valve stem, utilizes the pressure of lubricant oil and the leakage of hydraulic fluid chamber that the active length of hydraulic tappet is adjusted.Hydraulic coupling in this hydraulic tappet is changeless, the adjustment range of its active length is limited, can only adapt to the variation of engine thermal state, can't drive exhauxt valve opens to strengthen the effect of engine braking, more can't realize the mutual conversion of the normal operating conditions of motor and damped condition.
Summary of the invention
The purpose of this utility model is to propose a kind of hydraulic tappet of new type of adjustable.The passing ratio valve is dynamically adjusted the pressure size in the hydraulic tappet hydraulic pressure cavity, when motor normally moves, closed electromagnetic valve, the oil pressure of Proportional valve input is lower, be not enough to overcome the valve spring pretightening force, this moment, the work effect of hydraulic tappet was identical with common hydraulic tappet, eliminated and the compensation valve clearance by the hydraulic fluid chamber of sealing; When entering overrunning condition, solenoid valve keeps cutting out, the oil pressure that the Proportional valve input is higher, pressure oil flows into hydraulic fluid chamber through one-way valve, drive plunger, push rod, valve rocker and valve event, making exhaust valve overcome the valve spring pretightening force under hydraulic coupling drives opens, strengthen the braking force of engine braking, when needs increase the aperture size of exhaust valve, ECU control ratio valve raises the input oil pressure, oil pressure size and valve opening relation in direct ratio, i.e. the aperture of exhaust valve size dynamic adjustable makes motor also exportable different braking force under same rotating speed; When the needs brake off or when reducing the exhaust valve aperture, the oil pressure that the Proportional valve input is lower, solenoid valve is opened, and the oil liquid pressure in the hydraulic fluid chamber reduces, air valve drop, closed electromagnetic valve, distribution device enter predetermined working procedure.
The technological scheme that realizes the utility model purpose is as follows:
Be provided with a cover hydraulic tappet mechanism, comprise the tappet dish that directly contacts with valve cam, with plunger, tappet dish and plunger that push rod directly contacts between form hydraulic fluid chamber, process oil duct, Proportional valve, one-way valve and solenoid valve on body; It is characterized in that described Proportional valve controlled by Engine ECU, can dynamically adjust the oil pressure size that enters in oil duct and the hydraulic fluid chamber, when motor normally moves, oil pressure is lower, is not enough to overcome the valve spring pretightening force, under the engine braking state, oil pressure is higher, can make exhauxt valve opens, the aperture size raises with oil pressure to be increased, and does not produce movement interference during maximum opening.
The plunger lower end surface is spherical, with the upper-end surface formation hydraulic fluid chamber of tappet dish.
The inlet of hydraulic fluid chamber is provided with one-way valve, and the outlet port is provided with solenoid valve.
When the tappet dish contacted with the basic circle of valve cam, hydraulic fluid chamber communicated with the oil duct of processing on body, and when the tappet dish was pushed to certain lift by valve cam, hydraulic fluid chamber and oil duct disconnected.
Solenoid valve needs to reduce the exhaust valve aperture by engine control under the engine braking state, and motor is when becoming normal operating conditions by braking state, and solenoid valve opens and closes once, eliminates the oil pressure in the hydraulic fluid chamber, sets up new oil pressure.
Oil duct links to each other with the engine interior oil leab or is connected the specific hydraulic oil duct.
New type of adjustable hydraulic tappet of the present utility model can be united use with the engine exhaust retarder under overrunning condition, to strengthen engine braking effect.
Description of drawings
Fig. 1 is the structural representation of a kind of new type of adjustable hydraulic tappet of the present utility model.
Attached figure labeling description: 1-valve cam 2-tappet dish 3-engine body 4-oil duct 5-Proportional valve 6-one-way valve 7-hydraulic fluid chamber 8-plunger 9-push rod 10-rocking arm adjusting screw 11-adjusting nut 12-rocking arm 13-exhaust valve 14-cylinder head 15-air valve seat ring 16-solenoid valve
Embodiment
With reference to the accompanying drawings, an embodiment of the present utility model is described in detail.
As shown in Figure 1, a kind of new type of adjustable hydraulic tappet comprises the tappet dish (2) that directly contacts with valve cam (1), with the plunger (8) that push rod (9) directly contacts, the lower end surface of plunger (8) is spherical, and forms hydraulic fluid chamber (7) between the upper-end surface of tappet dish (2).The inlet of hydraulic fluid chamber (7) is provided with one-way valve (6), and the outlet port is provided with solenoid valve (16).When valve lift was zero, hydraulic fluid chamber (7) communicated with the oil duct (4) of processing on body.The inlet of oil duct (4) is provided with Proportional valve (5), and Proportional valve (5) can dynamically be adjusted the oil pressure size that enters in oil duct (4) and the hydraulic fluid chamber (7) by Engine ECU control.When motor normally moved, oil pressure was lower, was not enough to overcome the valve spring pretightening force, and under the engine braking state, oil pressure is higher, and exhaust valve (13) is opened.
Under the motor normal working, solenoid valve (16) cuts out, and the oil pressure that ECU control ratio valve (5) input is lower, the hydraulic oil one-way valve (6) of flowing through is full of hydraulic fluid chamber (7), eliminates the valve clearance of distribution device.When cam drove valve opening, because solenoid valve (16) and one-way valve (6) are all closed, hydraulic fluid chamber (7) was in sealing state, plays the effect of oil hydraulic cylinder, the distribution device proper functioning.When the engine thermal change of state, the variation of valve clearance can be adjusted by the natural leak of hydraulic fluid chamber (7).When motor reached normal working temperature, the natural leak of hydraulic fluid chamber (7) can be replenished by the low-pressure hydraulic oil outside the one-way valve (6).
When entering overrunning condition, the operating oil pressure that ECU control ratio valve (5) input is higher.When the lift of exhaust valve (13) is zero, hydraulic fluid chamber (7) communicates with the oil duct (4) of processing on body, the high pressure oil one-way valve (6) of flowing through enters hydraulic fluid chamber (7), oil liquid pressure acts on the spherical lower end surface of plunger (8), pass through push rod (9), rocking arm adjusting screw (10), rocking arm (12) successively, drive exhaust valve (13) and open.When cam drove valve event, because solenoid valve (16) and one-way valve (6) are all closed, hydraulic fluid chamber (7) was in sealing state, plays the effect of oil hydraulic cylinder, thereby the aperture of exhaust valve (13) is remained.When needs further increase the aperture of exhaust valve (13), the operating oil pressure that ECU control ratio valve (5) input is higher, when hydraulic fluid chamber (7) and oil duct (4) when communicating, high pressure oil enters hydraulic fluid chamber (7), and the aperture of exhaust valve (13) is further strengthened.During Proportional valve (5) output MTP, it is maximum that the aperture of exhaust valve (13) reaches, the spacing of valve and piston when the aperture size still is lower than top dead center, so the lasting unlatching of valve can not produce movement interference.When needs reduce the aperture of exhaust valve (13), the operating oil pressure that ECU control ratio valve (5) input is low slightly, solenoid valve (16) is opened, the higher fluid of pressure in the hydraulic fluid chamber (7) is discharged through solenoid valve (16), oil pressure is reduced to new operating oil pressure level, solenoid valve (16) cuts out, and exhaust valve (13) is because the driving of new operating oil pressure keeps less aperture.
Because exhaust valve (13) continues to open with a certain aperture, in compression stroke, during the piston high-speed motion, gas leaks less in the cylinder, and during near compression top center, velocity of piston is lower, and the cylinder internal air pressure is higher, and this moment, pressurized gas entered outlet pipe, make when expansion stroke begins, the cylinder internal air pressure reduces, and reduces the stroke acting, thereby increases the braking force in the braking process.When engine speed was high, the braking force when exhaust valve (13) aperture is big was higher than aperture braking force hour.And when engine speed was low, exhaust valve (13) aperture braking force hour was higher than the braking force of aperture when big.Therefore, dynamically adjust the lasting unlatching aperture size of exhaust valve (13) by the new type of adjustable hydraulic tappet, can under the constant situation of engine speed, dynamically adjust the braking force of motor, thereby satisfy the braking requirement under the different operating modes.
When entering normal working by overrunning condition, the operating oil pressure that ECU control ratio valve (5) input is lower, solenoid valve (16) is opened, the higher fluid of pressure is discharged through solenoid valve (16) in the hydraulic fluid chamber (7), oil pressure is reduced to new operating oil pressure level, and solenoid valve (16) cuts out, because new operating oil pressure can't overcome the valve spring pretightening force, exhaust valve (13) takes a seat and cuts out, and distribution device recovers normal working.
Claims (6)
1. new type of adjustable hydraulic tappet, comprise the tappet dish (2) that directly contacts with valve cam (1), with plunger (8), tappet dish and plunger that push rod (9) directly contacts between the hydraulic fluid chamber (7), oil duct (4), Proportional valve (5), one-way valve (6) and the solenoid valve (16) of processing on body that form; It is characterized in that described Proportional valve (5) controlled by Engine ECU, can dynamically adjust the oil pressure size that enters in oil duct and the hydraulic fluid chamber (7), when motor normally moves, oil pressure is lower, is not enough to overcome the valve spring pretightening force, under the engine braking state, oil pressure is higher, exhaust valve (13) is opened, and the aperture size raises with oil pressure to be increased, and does not produce movement interference during maximum opening.
2. a kind of new type of adjustable hydraulic tappet according to claim 1 is characterized in that plunger (8) lower end surface for spherical, with the upper-end surface formation hydraulic fluid chamber (7) of tappet dish (2).
3. a kind of new type of adjustable hydraulic tappet according to claim 1 is characterized in that the inlet of hydraulic fluid chamber (7) is provided with one-way valve (6), and the outlet port is provided with solenoid valve (16).
4. a kind of new type of adjustable hydraulic tappet according to claim 1, when it is characterized in that tappet dish (2) contacts with the basic circle of valve cam (1), hydraulic fluid chamber (7) communicates with the oil duct (4) of processing on body, when being pushed to certain lift, hydraulic fluid chamber (7) disconnects with oil duct (4) tappet dish (2) by valve cam (1).
5. a kind of new type of adjustable hydraulic tappet according to claim 1, it is characterized in that solenoid valve (16) controlled by Engine ECU, under the engine braking state, need to reduce the exhaust valve aperture, and motor is when becoming normal operating conditions by braking state, solenoid valve opens and closes once, eliminate the oil pressure in the hydraulic fluid chamber (7), set up new oil pressure.
6. a kind of new type of adjustable hydraulic tappet according to claim 1 is characterized in that oil duct (4) is continuous with the engine interior oil leab or is connected the specific hydraulic oil duct.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320074630 CN203130181U (en) | 2013-01-14 | 2013-01-14 | Novel adjustable hydraulic tappet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320074630 CN203130181U (en) | 2013-01-14 | 2013-01-14 | Novel adjustable hydraulic tappet |
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| Publication Number | Publication Date |
|---|---|
| CN203130181U true CN203130181U (en) | 2013-08-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201320074630 Expired - Lifetime CN203130181U (en) | 2013-01-14 | 2013-01-14 | Novel adjustable hydraulic tappet |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103925037A (en) * | 2013-01-14 | 2014-07-16 | 浙江师范大学 | Novel adjustable hydraulic tappet |
| GB2519600A (en) * | 2013-10-28 | 2015-04-29 | Jaguar Land Rover Ltd | Gasoline Engine Knock Control |
| GB2519601A (en) * | 2013-10-28 | 2015-04-29 | Jaguar Land Rover Ltd | Torque Modulation for Internal Combustion Engine |
| GB2519602A (en) * | 2013-10-28 | 2015-04-29 | Jaguar Land Rover Ltd | Method of Optimising Idling of an Internal Combustion Engine |
| GB2522604A (en) * | 2013-10-28 | 2015-08-05 | Jaguar Land Rover Ltd | Managing Shift energy in a transmission of a vehicle |
| CN106368755A (en) * | 2016-09-27 | 2017-02-01 | 浙江大学 | Variable valve timing mechanism |
| CN111894694A (en) * | 2020-06-29 | 2020-11-06 | 东风商用车有限公司 | Lift-controllable hydraulic tappet system |
-
2013
- 2013-01-14 CN CN 201320074630 patent/CN203130181U/en not_active Expired - Lifetime
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103925037B (en) * | 2013-01-14 | 2016-09-14 | 浙江师范大学 | A kind of adjustable hydraulic tappet |
| CN103925037A (en) * | 2013-01-14 | 2014-07-16 | 浙江师范大学 | Novel adjustable hydraulic tappet |
| US9777651B2 (en) | 2013-10-28 | 2017-10-03 | Jaquar Land Rover Limited | Managing shift energy in a transmission of a vehicle |
| GB2519601B (en) * | 2013-10-28 | 2017-10-11 | Jaguar Land Rover Ltd | Torque Modulation for Internal Combustion Engine |
| GB2522604A (en) * | 2013-10-28 | 2015-08-05 | Jaguar Land Rover Ltd | Managing Shift energy in a transmission of a vehicle |
| CN105683559A (en) * | 2013-10-28 | 2016-06-15 | 捷豹路虎有限公司 | Torque modulation for internal combustion engine |
| GB2519601A (en) * | 2013-10-28 | 2015-04-29 | Jaguar Land Rover Ltd | Torque Modulation for Internal Combustion Engine |
| US10947912B2 (en) | 2013-10-28 | 2021-03-16 | Jaguar Land Rover Limited | Gasoline engine knock control |
| GB2519600A (en) * | 2013-10-28 | 2015-04-29 | Jaguar Land Rover Ltd | Gasoline Engine Knock Control |
| GB2519602A (en) * | 2013-10-28 | 2015-04-29 | Jaguar Land Rover Ltd | Method of Optimising Idling of an Internal Combustion Engine |
| CN105683559B (en) * | 2013-10-28 | 2017-12-01 | 捷豹路虎有限公司 | Moment of torsion for explosive motor is adjusted |
| GB2522604B (en) * | 2013-10-28 | 2018-02-21 | Jaguar Land Rover Ltd | Managing Shift energy in a transmission of a vehicle |
| GB2519602B (en) * | 2013-10-28 | 2018-08-29 | Jaguar Land Rover Ltd | Method of Optimising Idling of an Internal Combustion Engine |
| GB2519600B (en) * | 2013-10-28 | 2018-09-12 | Jaguar Land Rover Ltd | Gasoline Engine Knock Control |
| US10612475B2 (en) | 2013-10-28 | 2020-04-07 | Jaguar Land Rover Limited | Torque modulation for internal combustion engine |
| CN106368755A (en) * | 2016-09-27 | 2017-02-01 | 浙江大学 | Variable valve timing mechanism |
| CN111894694A (en) * | 2020-06-29 | 2020-11-06 | 东风商用车有限公司 | Lift-controllable hydraulic tappet system |
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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 |
Granted publication date: 20130814 Effective date of abandoning: 20160914 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |