CN203867646U - Hydraulic tappet with changeable lift range - Google Patents
Hydraulic tappet with changeable lift range Download PDFInfo
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- CN203867646U CN203867646U CN201420058382.9U CN201420058382U CN203867646U CN 203867646 U CN203867646 U CN 203867646U CN 201420058382 U CN201420058382 U CN 201420058382U CN 203867646 U CN203867646 U CN 203867646U
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- oil
- tappet
- piston
- hydraulic tappet
- tappet body
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Abstract
The utility model discloses a hydraulic tappet with the changeable lift range, and relates to engines. The whole hydraulic tappet is in a cylinder shape. The hydraulic tappet comprises a tappet body, a piston, a one-way valve and a clamping spring, wherein the tappet body is located outside and is in tight fit with an air cylinder cover, an oil groove is formed in the outer cylinder, an oil inlet and outlet hole is formed in the oil tank, the piston is located inside the tappet body and is in tight fit with the inner wall of the tappet body, a high-pressure oil cavity is formed by the top of the piston and a reserved gap of the tappet body, an annular groove is formed in the cylinder, an oil channel is formed in the annular groove and communicated with an oil channel in the top of the piston, the bottom of the piston is provided with a protrusion, the one-way valve is located in the oil channel in the top of the piston and positioned by a spring, and the clamping spring is located at the open end inside the tappet body. According to the hydraulic tappet, the position of the piston inside the tappet body is controlled by changing the oil quantity inside the high-pressure oil cavity, so that the lift range is changed, the structure is simple and reasonable, valve seated impact is small, the size of an engine is not changed, and the hydraulic tappet can be applied only by slightly modifying the air cylinder cover of the engine.
Description
Technical field
The present invention relates to engine art, particularly a kind of hydraulic tappet.
Background technique
The characteristics of motion motion that hydraulic tappet is pressed cam, realizes opening and closing of valve.Hydraulic tappet is generally placed between camshaft and valve, directly or drive rocking arm control valve motion by push rod.When engine operation, fluid enters the hyperbaric chamber of hydraulic tappet inside, and valve and driving component thereof are in contact with one another, and eliminates valve clearance.
The Main Function of existing hydraulic tappet is to eliminate valve clearance, does not change the control law of cam to valve, and valve is according to the real shape of cam, by fixing port timing periodic duty.From engine principles, the motor with fixing port timing only has best charging efficiency at a certain rotating speed place, maximum power output, and economic speed scope is also very narrow.Higher or lower than this rotating speed, the power character of motor and Economy all have decline, and from this rotating speed more away from, engine performance index decline more obvious.
Summary of the invention
The present invention, in order to improve the performance index of motor in wider speed range, provides the motor variable lift hydraulic tappet of a kind of simple and reasonable, easy realization, variable valve timing.
In order to achieve the above object, the invention provides a kind of variable lift hydraulic tappet, specifically comprise:
Hydraulic tappet entirety is cylindrical, is made up of tappet body 1, piston 3, jump ring 2, one-way valve 5 and return spring 7, and wherein, tappet body 1 is positioned at outside, has oil groove on exterior circular column, establishes turnover oilhole in oil groove; Piston 3 is positioned at tappet body 1 inside, offers annular groove on cylindrical body, has oil duct to be communicated with piston 3 top oil ducts in annular groove, and projection is arranged at bottom; One-way valve 5, is arranged in piston 3 top oil ducts.
Variable lift hydraulic tappet, is characterized in that: on tappet body 1 exterior circular column, have low-pressure tank 8 and high pressure oil groove 9, have oil outlet 6 and oil inlet hole 4 in oil groove.
Variable lift hydraulic tappet, is characterized in that: tappet body 1 outer surface is bright and clean, and cylinder head 11 is carried out axial motion relatively.
Variable lift hydraulic tappet, is characterized in that: piston 3 outer surfaces are bright and clean, closely cooperates with tappet body 1 inwall, and top and tappet body 1 preset clearance form high-voltage oil cavity C.
Variable lift hydraulic tappet, is characterized in that: piston 3 can be in 1 axial motion of tappet body, on cylindrical body on annular groove along move to oil inlet hole 4 times along time, there is maximum axial motion displacement because oil duct cuts off voluntarily.
Variable lift hydraulic tappet, is characterized in that: one-way valve 5 is one and allows fluid one-way flow mechanism.
Compared with prior art, the present invention has following beneficial effect: in the time of engine running, fluid supply in cutoff high oil pocket C, piston 3 does not change axial position with tappet body 1, variable lift hydraulic tappet of the present invention is the same with existing hydraulic tappet function, camshaft drives valve by definite rule, and valve lift is less, adapts to the needs of low engine speed operating mode; Connect the fluid supply in high-voltage oil cavity C, piston 3 is relative with tappet 1 axial motion, and variable lift hydraulic tappet axial dimension periodically increases and shortens, can open in advance valve, delay and close valve, and increase valve lift, adapt to the needs of motor high speed operating mode.
Brief description of the drawings
Fig. 1 is variable lift hydraulic tappet structural drawing of the present invention.
Fig. 2 is the mounting point figure of variable lift hydraulic tappet of the present invention.
Fig. 3 is variable lift hydraulic tappet oil-feed view of the present invention.
Fig. 4 is the schematic diagram of working after variable lift hydraulic tappet of the present invention oil-feed.
Fig. 5 is variable lift hydraulic tappet draining view of the present invention.
Fig. 6 is not oil-feed work schematic diagram of variable lift hydraulic tappet of the present invention.
Attached figure labeling description: 1-tappet body 2-jump ring 3-piston 4-oil inlet hole 5-one-way valve 6-oil outlet 7-return spring 8-low-pressure tank 9-high pressure oil groove 10-intake cam 11-cylinder head 12-locking plate 13-upper spring seat 14-valve spring 15-valve stem 16-lower spring cup 17-spool return spring 18-spool 19-draining cam locus circle 20-stops oily cam locus circle 21-basic circle 22-and joins oily cam A-high pressure oil input channel B-low pressure back oil road C-oil pocket H-lift
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail, but is to be understood that protection scope of the present invention is not subject to the restriction of embodiment.It will be appreciated that, mentioned " top ", " bottom ", " interior " in following mode of execution of the present invention, " outward ", " on ", D score, " left side ", " right side " be all taking the direction shown in each figure as benchmark, these words that are used for limiting direction are only used to be convenient to explanation, engine component has also done certain designs simplification and minimizing, position relationship between illustrated component is also for convenience of explanation, does not represent the restriction to the concrete technological scheme of the present invention.
Variable lift hydraulic tappet of the present invention, by controlling the injection of fluid in its inner oil pocket and releasing to realize the change of axial dimension, under low speed operating mode, valve opening time is short, and lift is little; Under high speed operating mode, valve opening time is long, and lift is large, simple and reasonable, easily realizes.
As shown in Figure 1, variable lift hydraulic tappet structural drawing of the present invention, specifically comprises: tappet body 1, and cylindrical, be positioned at outside, appearance is bright and clean, has in low-pressure tank 8 and high pressure oil groove 9, two oil grooves and have oil inlet hole 4 and oil outlet 6 on exterior circular column; Piston 3, cylindrical, be positioned at tappet body 1 inside, appearance is bright and clean, closely cooperates with tappet body 1 inwall, offers annular groove on exterior circular column, has oil duct to be communicated with piston 3 top oil ducts in annular groove, and projection is arranged at bottom; One-way valve 5, is arranged in piston 3 top oil ducts, stops fluid to circulate downwards, locates with return spring 7; Jump ring 2, is positioned at tappet body 1 inside opening place.
As shown in Figure 2, be the mounting point figure of variable lift hydraulic tappet of the present invention.This hydraulic tappet is between intake cam 10 and valve stem 15, valve stem 15 under valve spring 14 effect in position, the top, piston 3 is shifted onto to the top of tappet body 1 inside, return spring 7 also works simultaneously, makes the top of tappet body 1 be close to intake cam 10 to eliminate valve clearance.Now, the radial direction oil on piston 3 communicates with oil inlet hole 4, and high-voltage oil cavity is not oil-filled, communicates with oil outlet 6, and the axial length of variable lift hydraulic tappet of the present invention is the shortest.The maximum lift H that variable lift hydraulic tappet of the present invention has is the radially distance between upper edge and oil inlet hole 4 lower edges of annular groove of piston 3.
As shown in Figure 3, be variable lift hydraulic tappet oil-feed view of the present invention.Join that oily cam 22 has basic circle 21, stops oily cam locus circle 20, draining cam locus circle 19 gabarits that are smoothly connected, with intake cam 10 coaxial rotation, by controlling the position of spool 18, there is " fuel feeding ", " stopping oil ", " draining ", " stopping oil " loop control function.Its base circle portion contacted with spool 18 before intake cam 10 promotes tappet body 1, high pressure oil input channel A is communicated with the oil duct on piston 3 by spool 18, oil inlet hole 4, pass through again one-way valve 5 to high-voltage oil cavity C injecting oil liquid, and spool 18 has cut off being connected of high-voltage oil cavity C and low pressure back oil road B, piston 3 is at the interior maximum lift H that moves to downwards of tappet body 1, and valve opened before actuated by cams.In the time that high-voltage oil cavity C pressure is the same with pressure in high pressure oil input channel A, one-way valve 5 is taken a seat and is closed, the impact of the variation of oil liquid pressure on the oil liquid pressure in high-pressure oil duct A in prevention high-voltage oil cavity C.
As shown in Figure 4, be the schematic diagram of working after variable lift hydraulic tappet of the present invention oil-feed.When intake cam 10 drives tappet body 1 to move down, join oily cam 22 and promote spool 18 and close the passage of high pressure oil input channel A and oil inlet hole 4 and low pressure back oil road B and oil outlet 6, in high-voltage oil cavity C, fluid is closed, promoting valve stem 15 together with piston 3 moves down, the axial length of variable lift hydraulic tappet of the present invention is the longest, and the lift of valve is intake cam 10 lifts and piston 3 lift H sums.
As shown in Figure 5, be variable lift hydraulic tappet draining view of the present invention.In valve stem 15 return processes, piston 3 is constant with the relative position of tappet body 1.When tappet body 1 contacts with the base circle portion of intake cam 10, owing to being full of fluid in high-voltage oil cavity C, valve is in open mode.Only have when joining oily cam 22 and continue to press down spool 18, make spool 18 open the path between low pressure back oil road B and oil outlet 6, when the fluid in high-voltage oil cavity C starts to release, on the relative tappet body 1 of piston 3, move, valve stem 15 just continues return, and valve obtains late release.Because the fluid in high-voltage oil cavity C is released by draining hole 6, need the regular hour, the impact of air valve drop is also less.
As shown in Figure 6, be not oil-feed work schematic diagram of variable lift hydraulic tappet of the present invention.When under low engine speed operating mode, fluid passage in cutoff high oil input channel A, where no matter join oily cam 22 in, in high-voltage oil cavity C, not having fluid injects, the relative position of piston 3 and tappet body 1 remains unchanged, valve stem 15 carries out periodic motion with the track of intake cam 10, and the opening time of valve shortens, and lift is the same with intake cam 10.
To sum up, variable lift hydraulic tappet can, according to injection or the relief situation of injecting inner fluid, change self axial dimension, makes engine valve under different rotating speeds, obtain different valve timings and valve lift, meets the needs of Under Different Work Condition of Engine.This kind of hydraulic tappet is simple in structure, and air valve drop impacts little, little to the change of motor, can conveniently apply.
Disclosed above only have several specific embodiment of the present invention.But the present invention is not limited thereto, the changes that any person skilled in the art can think of all should fall into protection scope of the present invention.
Claims (6)
1. a variable lift hydraulic tappet, it is characterized in that: this hydraulic tappet entirety is cylindrical, formed by tappet body (1), piston (3), jump ring (2), one-way valve (5) and return spring (7), wherein, tappet body (1) is positioned at outside, on exterior circular column, have oil groove, in oil groove, establish turnover oilhole; Piston (3) is positioned at tappet body (1) inside, offers annular groove on cylindrical body, has oil duct to be communicated with piston (3) top oil duct in annular groove, and projection is arranged at bottom; One-way valve (5), is arranged in piston (3) top oil duct.
2. variable lift hydraulic tappet according to claim 1, it is characterized in that: on tappet body (1) exterior circular column, have low-pressure tank (8) and high pressure oil groove (9), in oil groove, have oil outlet (6) and oil inlet hole (4).
3. variable lift hydraulic tappet according to claim 1, is characterized in that: tappet body (1) outer surface is bright and clean, and cylinder head (11) is carried out axial motion relatively.
4. variable lift hydraulic tappet according to claim 1, it is characterized in that: piston (3) outer surface is bright and clean, closely cooperate with tappet body (1) inwall, top and tappet body (1) preset clearance form high-voltage oil cavity (C).
5. variable lift hydraulic tappet according to claim 1, it is characterized in that: piston (3) can be in tappet body (1) axial motion, on cylindrical body annular groove along move under oil inlet hole (4) along time, there is maximum axial motion displacement because oil duct cuts off voluntarily.
6. variable lift hydraulic tappet according to claim 1, is characterized in that: one-way valve (5) is one and allows fluid one-way flow mechanism.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420058382.9U CN203867646U (en) | 2014-01-28 | 2014-01-28 | Hydraulic tappet with changeable lift range |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420058382.9U CN203867646U (en) | 2014-01-28 | 2014-01-28 | Hydraulic tappet with changeable lift range |
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| Publication Number | Publication Date |
|---|---|
| CN203867646U true CN203867646U (en) | 2014-10-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420058382.9U Expired - Fee Related CN203867646U (en) | 2014-01-28 | 2014-01-28 | Hydraulic tappet with changeable lift range |
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| CN (1) | CN203867646U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103742216A (en) * | 2014-01-24 | 2014-04-23 | 赵迎生 | Lift-variable hydraulic tappet |
| CN106285816A (en) * | 2015-05-21 | 2017-01-04 | 北京理工大学 | A kind of hydraulic variable valve and control method thereof |
-
2014
- 2014-01-28 CN CN201420058382.9U patent/CN203867646U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103742216A (en) * | 2014-01-24 | 2014-04-23 | 赵迎生 | Lift-variable hydraulic tappet |
| CN106285816A (en) * | 2015-05-21 | 2017-01-04 | 北京理工大学 | A kind of hydraulic variable valve and control method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141008 Termination date: 20190128 |